git.oblomov.eu Git - linux-2.6/blob - drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <asm/uaccess.h>
  37
  38 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.1"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0 )       /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5 )       /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          //Zero_Flag_Reg1    58
 106 #define ZLP_REG5  0x3E          //Zero_Flag_Reg5    62
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 #define USB_VENDOR_ID_MOSCHIP           0x9710
 114 #define MOSCHIP_DEVICE_ID_7840          0x7840
 115 #define MOSCHIP_DEVICE_ID_7820          0x7820
 116
 117 /* Interrupt Rotinue Defines    */
 118
 119 #define SERIAL_IIR_RLS      0x06
 120 #define SERIAL_IIR_MS       0x00
 121
 122 /*
 123  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 124  */
 125 #define SERIAL_LSR_DR       0x0001
 126 #define SERIAL_LSR_OE       0x0002
 127 #define SERIAL_LSR_PE       0x0004
 128 #define SERIAL_LSR_FE       0x0008
 129 #define SERIAL_LSR_BI       0x0010
 130
 131 #define MOS_MSR_DELTA_CTS   0x10
 132 #define MOS_MSR_DELTA_DSR   0x20
 133 #define MOS_MSR_DELTA_RI    0x40
 134 #define MOS_MSR_DELTA_CD    0x80
 135
 136 // Serial Port register Address
 137 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 138 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 139 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 140 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 141 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 142 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 143 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 144 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 145 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 146
 147 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 148 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 149
 150 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 151
 152 /*
 153  * URB POOL related defines
 154  */
 155 #define NUM_URBS                        16      /* URB Count */
 156 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 157
 158
 159 static struct usb_device_id moschip_port_id_table[] = {
 160         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 161         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 162         {}                      /* terminating entry */
 163 };
 164
 165 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 166         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 167         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 168         {}                      /* terminating entry */
 169 };
 170
 171 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 172
 173 /* This structure holds all of the local port information */
 174
 175 struct moschip_port {
 176         int port_num;           /*Actual port number in the device(1,2,etc) */
 177         struct urb *write_urb;  /* write URB for this port */
 178         struct urb *read_urb;   /* read URB for this port */
 179         __u8 shadowLCR;         /* last LCR value received */
 180         __u8 shadowMCR;         /* last MCR value received */
 181         char open;
 182         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 183         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 184         int delta_msr_cond;
 185         struct async_icount icount;
 186         struct usb_serial_port *port;   /* loop back to the owner of this object */
 187
 188         /*Offsets */
 189         __u8 SpRegOffset;
 190         __u8 ControlRegOffset;
 191         __u8 DcrRegOffset;
 192         //for processing control URBS in interrupt context
 193         struct urb *control_urb;
 194         char *ctrl_buf;
 195         int MsrLsr;
 196
 197         struct urb *write_urb_pool[NUM_URBS];
 198 };
 199
 200
 201 static int debug;
 202 static int mos7840_num_ports;   //this says the number of ports in the device
 203 static int mos7840_num_open_ports;
 204
 205
 206 /*
 207  * mos7840_set_reg_sync
 208  *      To set the Control register by calling usb_fill_control_urb function
 209  *      by passing usb_sndctrlpipe function as parameter.
 210  */
 211
 212 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 213                                 __u16 val)
 214 {
 215         struct usb_device *dev = port->serial->dev;
 216         val = val & 0x00ff;
 217         dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 218
 219         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 220                                MCS_WR_RTYPE, val, reg, NULL, 0,
 221                                MOS_WDR_TIMEOUT);
 222 }
 223
 224 /*
 225  * mos7840_get_reg_sync
 226  *      To set the Uart register by calling usb_fill_control_urb function by
 227  *      passing usb_rcvctrlpipe function as parameter.
 228  */
 229
 230 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 231                                 __u16 * val)
 232 {
 233         struct usb_device *dev = port->serial->dev;
 234         int ret = 0;
 235
 236         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 237                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 238                               MOS_WDR_TIMEOUT);
 239         dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
 240         *val = (*val) & 0x00ff;
 241         return ret;
 242 }
 243
 244 /*
 245  * mos7840_set_uart_reg
 246  *      To set the Uart register by calling usb_fill_control_urb function by
 247  *      passing usb_sndctrlpipe function as parameter.
 248  */
 249
 250 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 251                                 __u16 val)
 252 {
 253
 254         struct usb_device *dev = port->serial->dev;
 255         val = val & 0x00ff;
 256         // For the UART control registers, the application number need to be Or'ed
 257         if (mos7840_num_ports == 4) {
 258                 val |=
 259                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 260                      1) << 8;
 261                 dbg("mos7840_set_uart_reg application number is %x\n", val);
 262         } else {
 263                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 264                         val |=
 265                             (((__u16) port->number -
 266                               (__u16) (port->serial->minor)) + 1) << 8;
 267                         dbg("mos7840_set_uart_reg application number is %x\n",
 268                             val);
 269                 } else {
 270                         val |=
 271                             (((__u16) port->number -
 272                               (__u16) (port->serial->minor)) + 2) << 8;
 273                         dbg("mos7840_set_uart_reg application number is %x\n",
 274                             val);
 275                 }
 276         }
 277         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 278                                MCS_WR_RTYPE, val, reg, NULL, 0,
 279                                MOS_WDR_TIMEOUT);
 280
 281 }
 282
 283 /*
 284  * mos7840_get_uart_reg
 285  *      To set the Control register by calling usb_fill_control_urb function
 286  *      by passing usb_rcvctrlpipe function as parameter.
 287  */
 288 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 289                                 __u16 * val)
 290 {
 291         struct usb_device *dev = port->serial->dev;
 292         int ret = 0;
 293         __u16 Wval;
 294
 295         //dbg("application number is %4x \n",(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8);
 296         /*Wval  is same as application number */
 297         if (mos7840_num_ports == 4) {
 298                 Wval =
 299                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 300                      1) << 8;
 301                 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
 302         } else {
 303                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 304                         Wval =
 305                             (((__u16) port->number -
 306                               (__u16) (port->serial->minor)) + 1) << 8;
 307                         dbg("mos7840_get_uart_reg application number is %x\n",
 308                             Wval);
 309                 } else {
 310                         Wval =
 311                             (((__u16) port->number -
 312                               (__u16) (port->serial->minor)) + 2) << 8;
 313                         dbg("mos7840_get_uart_reg application number is %x\n",
 314                             Wval);
 315                 }
 316         }
 317         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 318                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 319                               MOS_WDR_TIMEOUT);
 320         *val = (*val) & 0x00ff;
 321         return ret;
 322 }
 323
 324 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 325 {
 326
 327         dbg("***************************************\n");
 328         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 329         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 330         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 331         dbg("***************************************\n");
 332
 333 }
 334
 335 /************************************************************************/
 336 /************************************************************************/
 337 /*             I N T E R F A C E   F U N C T I O N S                    */
 338 /*             I N T E R F A C E   F U N C T I O N S                    */
 339 /************************************************************************/
 340 /************************************************************************/
 341
 342 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 343                                             struct moschip_port *data)
 344 {
 345         usb_set_serial_port_data(port, (void *)data);
 346 }
 347
 348 static inline struct moschip_port *mos7840_get_port_private(struct
 349                                                             usb_serial_port
 350                                                             *port)
 351 {
 352         return (struct moschip_port *)usb_get_serial_port_data(port);
 353 }
 354
 355 static int mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 356 {
 357         struct moschip_port *mos7840_port;
 358         struct async_icount *icount;
 359         mos7840_port = port;
 360         icount = &mos7840_port->icount;
 361         if (new_msr &
 362             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 363              MOS_MSR_DELTA_CD)) {
 364                 icount = &mos7840_port->icount;
 365
 366                 /* update input line counters */
 367                 if (new_msr & MOS_MSR_DELTA_CTS) {
 368                         icount->cts++;
 369                 }
 370                 if (new_msr & MOS_MSR_DELTA_DSR) {
 371                         icount->dsr++;
 372                 }
 373                 if (new_msr & MOS_MSR_DELTA_CD) {
 374                         icount->dcd++;
 375                 }
 376                 if (new_msr & MOS_MSR_DELTA_RI) {
 377                         icount->rng++;
 378                 }
 379         }
 380
 381         return 0;
 382 }
 383
 384 static int mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 385 {
 386         struct async_icount *icount;
 387
 388         dbg("%s - %02x", __FUNCTION__, new_lsr);
 389
 390         if (new_lsr & SERIAL_LSR_BI) {
 391                 //
 392                 // Parity and Framing errors only count if they
 393                 // occur exclusive of a break being
 394                 // received.
 395                 //
 396                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 397         }
 398
 399         /* update input line counters */
 400         icount = &port->icount;
 401         if (new_lsr & SERIAL_LSR_BI) {
 402                 icount->brk++;
 403         }
 404         if (new_lsr & SERIAL_LSR_OE) {
 405                 icount->overrun++;
 406         }
 407         if (new_lsr & SERIAL_LSR_PE) {
 408                 icount->parity++;
 409         }
 410         if (new_lsr & SERIAL_LSR_FE) {
 411                 icount->frame++;
 412         }
 413
 414         return 0;
 415 }
 416
 417 /************************************************************************/
 418 /************************************************************************/
 419 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 420 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 421 /************************************************************************/
 422 /************************************************************************/
 423
 424 static void mos7840_control_callback(struct urb *urb)
 425 {
 426         unsigned char *data;
 427         struct moschip_port *mos7840_port;
 428         __u8 regval = 0x0;
 429
 430         if (!urb) {
 431                 dbg("%s", "Invalid Pointer !!!!:\n");
 432                 return;
 433         }
 434
 435         switch (urb->status) {
 436         case 0:
 437                 /* success */
 438                 break;
 439         case -ECONNRESET:
 440         case -ENOENT:
 441         case -ESHUTDOWN:
 442                 /* this urb is terminated, clean up */
 443                 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
 444                     urb->status);
 445                 return;
 446         default:
 447                 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
 448                     urb->status);
 449                 goto exit;
 450         }
 451
 452         mos7840_port = (struct moschip_port *)urb->context;
 453
 454         dbg("%s urb buffer size is %d\n", __FUNCTION__, urb->actual_length);
 455         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __FUNCTION__,
 456             mos7840_port->MsrLsr, mos7840_port->port_num);
 457         data = urb->transfer_buffer;
 458         regval = (__u8) data[0];
 459         dbg("%s data is %x\n", __FUNCTION__, regval);
 460         if (mos7840_port->MsrLsr == 0)
 461                 mos7840_handle_new_msr(mos7840_port, regval);
 462         else if (mos7840_port->MsrLsr == 1)
 463                 mos7840_handle_new_lsr(mos7840_port, regval);
 464
 465       exit:
 466         return;
 467 }
 468
 469 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 470                            __u16 * val)
 471 {
 472         struct usb_device *dev = mcs->port->serial->dev;
 473         struct usb_ctrlrequest *dr = NULL;
 474         unsigned char *buffer = NULL;
 475         int ret = 0;
 476         buffer = (__u8 *) mcs->ctrl_buf;
 477
 478 //      dr=(struct usb_ctrlrequest *)(buffer);
 479         dr = (void *)(buffer + 2);
 480         dr->bRequestType = MCS_RD_RTYPE;
 481         dr->bRequest = MCS_RDREQ;
 482         dr->wValue = cpu_to_le16(Wval); //0;
 483         dr->wIndex = cpu_to_le16(reg);
 484         dr->wLength = cpu_to_le16(2);
 485
 486         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 487                              (unsigned char *)dr, buffer, 2,
 488                              mos7840_control_callback, mcs);
 489         mcs->control_urb->transfer_buffer_length = 2;
 490         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 491         return ret;
 492 }
 493
 494 /*****************************************************************************
 495  * mos7840_interrupt_callback
 496  *      this is the callback function for when we have received data on the
 497  *      interrupt endpoint.
 498  *****************************************************************************/
 499
 500 static void mos7840_interrupt_callback(struct urb *urb)
 501 {
 502         int result;
 503         int length;
 504         struct moschip_port *mos7840_port;
 505         struct usb_serial *serial;
 506         __u16 Data;
 507         unsigned char *data;
 508         __u8 sp[5], st;
 509         int i;
 510         __u16 wval;
 511
 512         dbg("%s", " : Entering\n");
 513         if (!urb) {
 514                 dbg("%s", "Invalid Pointer !!!!:\n");
 515                 return;
 516         }
 517
 518         switch (urb->status) {
 519         case 0:
 520                 /* success */
 521                 break;
 522         case -ECONNRESET:
 523         case -ENOENT:
 524         case -ESHUTDOWN:
 525                 /* this urb is terminated, clean up */
 526                 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
 527                     urb->status);
 528                 return;
 529         default:
 530                 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
 531                     urb->status);
 532                 goto exit;
 533         }
 534
 535         length = urb->actual_length;
 536         data = urb->transfer_buffer;
 537
 538         serial = (struct usb_serial *)urb->context;
 539
 540         /* Moschip get 5 bytes
 541          * Byte 1 IIR Port 1 (port.number is 0)
 542          * Byte 2 IIR Port 2 (port.number is 1)
 543          * Byte 3 IIR Port 3 (port.number is 2)
 544          * Byte 4 IIR Port 4 (port.number is 3)
 545          * Byte 5 FIFO status for both */
 546
 547         if (length && length > 5) {
 548                 dbg("%s \n", "Wrong data !!!");
 549                 return;
 550         }
 551
 552         sp[0] = (__u8) data[0];
 553         sp[1] = (__u8) data[1];
 554         sp[2] = (__u8) data[2];
 555         sp[3] = (__u8) data[3];
 556         st = (__u8) data[4];
 557
 558         for (i = 0; i < serial->num_ports; i++) {
 559                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 560                 wval =
 561                     (((__u16) serial->port[i]->number -
 562                       (__u16) (serial->minor)) + 1) << 8;
 563                 if (mos7840_port->open) {
 564                         if (sp[i] & 0x01) {
 565                                 dbg("SP%d No Interrupt !!!\n", i);
 566                         } else {
 567                                 switch (sp[i] & 0x0f) {
 568                                 case SERIAL_IIR_RLS:
 569                                         dbg("Serial Port %d: Receiver status error or ", i);
 570                                         dbg("address bit detected in 9-bit mode\n");
 571                                         mos7840_port->MsrLsr = 1;
 572                                         mos7840_get_reg(mos7840_port, wval,
 573                                                         LINE_STATUS_REGISTER,
 574                                                         &Data);
 575                                         break;
 576                                 case SERIAL_IIR_MS:
 577                                         dbg("Serial Port %d: Modem status change\n", i);
 578                                         mos7840_port->MsrLsr = 0;
 579                                         mos7840_get_reg(mos7840_port, wval,
 580                                                         MODEM_STATUS_REGISTER,
 581                                                         &Data);
 582                                         break;
 583                                 }
 584                         }
 585                 }
 586         }
 587       exit:
 588         result = usb_submit_urb(urb, GFP_ATOMIC);
 589         if (result) {
 590                 dev_err(&urb->dev->dev,
 591                         "%s - Error %d submitting interrupt urb\n",
 592                         __FUNCTION__, result);
 593         }
 594
 595         return;
 596
 597 }
 598
 599 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 600                                        const char *function)
 601 {
 602         if (!port) {
 603                 dbg("%s - port == NULL", function);
 604                 return -1;
 605         }
 606         if (!port->serial) {
 607                 dbg("%s - port->serial == NULL", function);
 608                 return -1;
 609         }
 610
 611         return 0;
 612 }
 613
 614 /* Inline functions to check the sanity of a pointer that is passed to us */
 615 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 616                                          const char *function)
 617 {
 618         if (!serial) {
 619                 dbg("%s - serial == NULL", function);
 620                 return -1;
 621         }
 622         if (!serial->type) {
 623                 dbg("%s - serial->type == NULL!", function);
 624                 return -1;
 625         }
 626
 627         return 0;
 628 }
 629
 630 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 631                                                  const char *function)
 632 {
 633         /* if no port was specified, or it fails a paranoia check */
 634         if (!port ||
 635             mos7840_port_paranoia_check(port, function) ||
 636             mos7840_serial_paranoia_check(port->serial, function)) {
 637                 /* then say that we don't have a valid usb_serial thing, which will                  * end up genrating -ENODEV return values */
 638                 return NULL;
 639         }
 640
 641         return port->serial;
 642 }
 643
 644 /*****************************************************************************
 645  * mos7840_bulk_in_callback
 646  *      this is the callback function for when we have received data on the
 647  *      bulk in endpoint.
 648  *****************************************************************************/
 649
 650 static void mos7840_bulk_in_callback(struct urb *urb)
 651 {
 652         int status;
 653         unsigned char *data;
 654         struct usb_serial *serial;
 655         struct usb_serial_port *port;
 656         struct moschip_port *mos7840_port;
 657         struct tty_struct *tty;
 658
 659         if (!urb) {
 660                 dbg("%s", "Invalid Pointer !!!!:\n");
 661                 return;
 662         }
 663
 664         if (urb->status) {
 665                 dbg("nonzero read bulk status received: %d", urb->status);
 666                 return;
 667         }
 668
 669         mos7840_port = (struct moschip_port *)urb->context;
 670         if (!mos7840_port) {
 671                 dbg("%s", "NULL mos7840_port pointer \n");
 672                 return;
 673         }
 674
 675         port = (struct usb_serial_port *)mos7840_port->port;
 676         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
 677                 dbg("%s", "Port Paranoia failed \n");
 678                 return;
 679         }
 680
 681         serial = mos7840_get_usb_serial(port, __FUNCTION__);
 682         if (!serial) {
 683                 dbg("%s\n", "Bad serial pointer ");
 684                 return;
 685         }
 686
 687         dbg("%s\n", "Entering... \n");
 688
 689         data = urb->transfer_buffer;
 690
 691         dbg("%s", "Entering ........... \n");
 692
 693         if (urb->actual_length) {
 694                 tty = mos7840_port->port->tty;
 695                 if (tty) {
 696                         tty_buffer_request_room(tty, urb->actual_length);
 697                         tty_insert_flip_string(tty, data, urb->actual_length);
 698                         dbg(" %s \n", data);
 699                         tty_flip_buffer_push(tty);
 700                 }
 701                 mos7840_port->icount.rx += urb->actual_length;
 702                 dbg("mos7840_port->icount.rx is %d:\n",
 703                     mos7840_port->icount.rx);
 704         }
 705
 706         if (!mos7840_port->read_urb) {
 707                 dbg("%s", "URB KILLED !!!\n");
 708                 return;
 709         }
 710
 711         if (mos7840_port->read_urb->status != -EINPROGRESS) {
 712                 mos7840_port->read_urb->dev = serial->dev;
 713
 714                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 715
 716                 if (status) {
 717                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
 718                             status);
 719                 }
 720         }
 721 }
 722
 723 /*****************************************************************************
 724  * mos7840_bulk_out_data_callback
 725  *      this is the callback function for when we have finished sending serial data
 726  *      on the bulk out endpoint.
 727  *****************************************************************************/
 728
 729 static void mos7840_bulk_out_data_callback(struct urb *urb)
 730 {
 731         struct moschip_port *mos7840_port;
 732         struct tty_struct *tty;
 733         if (!urb) {
 734                 dbg("%s", "Invalid Pointer !!!!:\n");
 735                 return;
 736         }
 737
 738         if (urb->status) {
 739                 dbg("nonzero write bulk status received:%d\n", urb->status);
 740                 return;
 741         }
 742
 743         mos7840_port = (struct moschip_port *)urb->context;
 744         if (!mos7840_port) {
 745                 dbg("%s", "NULL mos7840_port pointer \n");
 746                 return;
 747         }
 748
 749         if (mos7840_port_paranoia_check(mos7840_port->port, __FUNCTION__)) {
 750                 dbg("%s", "Port Paranoia failed \n");
 751                 return;
 752         }
 753
 754         dbg("%s \n", "Entering .........");
 755
 756         tty = mos7840_port->port->tty;
 757
 758         if (tty && mos7840_port->open) {
 759                 /* let the tty driver wakeup if it has a special *
 760                  * write_wakeup function                         */
 761
 762                 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP))
 763                     && tty->ldisc.write_wakeup) {
 764                         (tty->ldisc.write_wakeup) (tty);
 765                 }
 766
 767                 /* tell the tty driver that something has changed */
 768                 wake_up_interruptible(&tty->write_wait);
 769         }
 770
 771 }
 772
 773 /************************************************************************/
 774 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
 775 /************************************************************************/
 776 #ifdef MCSSerialProbe
 777 static int mos7840_serial_probe(struct usb_serial *serial,
 778                                 const struct usb_device_id *id)
 779 {
 780
 781         /*need to implement the mode_reg reading and updating\
 782            structures usb_serial_ device_type\
 783            (i.e num_ports, num_bulkin,bulkout etc) */
 784         /* Also we can update the changes  attach */
 785         return 1;
 786 }
 787 #endif
 788
 789 /*****************************************************************************
 790  * mos7840_open
 791  *      this function is called by the tty driver when a port is opened
 792  *      If successful, we return 0
 793  *      Otherwise we return a negative error number.
 794  *****************************************************************************/
 795
 796 static int mos7840_open(struct usb_serial_port *port, struct file *filp)
 797 {
 798         int response;
 799         int j;
 800         struct usb_serial *serial;
 801         struct urb *urb;
 802         __u16 Data;
 803         int status;
 804         struct moschip_port *mos7840_port;
 805
 806         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
 807                 dbg("%s", "Port Paranoia failed \n");
 808                 return -ENODEV;
 809         }
 810
 811         mos7840_num_open_ports++;
 812         serial = port->serial;
 813
 814         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
 815                 dbg("%s", "Serial Paranoia failed \n");
 816                 return -ENODEV;
 817         }
 818
 819         mos7840_port = mos7840_get_port_private(port);
 820
 821         if (mos7840_port == NULL)
 822                 return -ENODEV;
 823
 824         usb_clear_halt(serial->dev, port->write_urb->pipe);
 825         usb_clear_halt(serial->dev, port->read_urb->pipe);
 826
 827         /* Initialising the write urb pool */
 828         for (j = 0; j < NUM_URBS; ++j) {
 829                 urb = usb_alloc_urb(0, GFP_ATOMIC);
 830                 mos7840_port->write_urb_pool[j] = urb;
 831
 832                 if (urb == NULL) {
 833                         err("No more urbs???");
 834                         continue;
 835                 }
 836
 837                 urb->transfer_buffer = NULL;
 838                 urb->transfer_buffer =
 839                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
 840                 if (!urb->transfer_buffer) {
 841                         err("%s-out of memory for urb buffers.", __FUNCTION__);
 842                         continue;
 843                 }
 844         }
 845
 846 /*****************************************************************************
 847  * Initialize MCS7840 -- Write Init values to corresponding Registers
 848  *
 849  * Register Index
 850  * 1 : IER
 851  * 2 : FCR
 852  * 3 : LCR
 853  * 4 : MCR
 854  *
 855  * 0x08 : SP1/2 Control Reg
 856  *****************************************************************************/
 857
 858 //NEED to check the following Block
 859
 860         status = 0;
 861         Data = 0x0;
 862         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 863         if (status < 0) {
 864                 dbg("Reading Spreg failed\n");
 865                 return -1;
 866         }
 867         Data |= 0x80;
 868         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 869         if (status < 0) {
 870                 dbg("writing Spreg failed\n");
 871                 return -1;
 872         }
 873
 874         Data &= ~0x80;
 875         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 876         if (status < 0) {
 877                 dbg("writing Spreg failed\n");
 878                 return -1;
 879         }
 880 //End of block to be checked
 881
 882         status = 0;
 883         Data = 0x0;
 884         status =
 885             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 886         if (status < 0) {
 887                 dbg("Reading Controlreg failed\n");
 888                 return -1;
 889         }
 890         Data |= 0x08;           //Driver done bit
 891         Data |= 0x20;           //rx_disable
 892         status = 0;
 893         status =
 894             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 895         if (status < 0) {
 896                 dbg("writing Controlreg failed\n");
 897                 return -1;
 898         }
 899         //do register settings here
 900         // Set all regs to the device default values.
 901         ////////////////////////////////////
 902         // First Disable all interrupts.
 903         ////////////////////////////////////
 904
 905         Data = 0x00;
 906         status = 0;
 907         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 908         if (status < 0) {
 909                 dbg("disableing interrupts failed\n");
 910                 return -1;
 911         }
 912         // Set FIFO_CONTROL_REGISTER to the default value
 913         Data = 0x00;
 914         status = 0;
 915         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 916         if (status < 0) {
 917                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 918                 return -1;
 919         }
 920
 921         Data = 0xcf;
 922         status = 0;
 923         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 924         if (status < 0) {
 925                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 926                 return -1;
 927         }
 928
 929         Data = 0x03;
 930         status = 0;
 931         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 932         mos7840_port->shadowLCR = Data;
 933
 934         Data = 0x0b;
 935         status = 0;
 936         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 937         mos7840_port->shadowMCR = Data;
 938
 939         Data = 0x00;
 940         status = 0;
 941         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 942         mos7840_port->shadowLCR = Data;
 943
 944         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
 945         status = 0;
 946         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 947
 948         Data = 0x0c;
 949         status = 0;
 950         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 951
 952         Data = 0x0;
 953         status = 0;
 954         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 955
 956         Data = 0x00;
 957         status = 0;
 958         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 959
 960         Data = Data & ~SERIAL_LCR_DLAB;
 961         status = 0;
 962         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 963         mos7840_port->shadowLCR = Data;
 964
 965         //clearing Bulkin and Bulkout Fifo
 966         Data = 0x0;
 967         status = 0;
 968         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 969
 970         Data = Data | 0x0c;
 971         status = 0;
 972         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 973
 974         Data = Data & ~0x0c;
 975         status = 0;
 976         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 977         //Finally enable all interrupts
 978         Data = 0x0;
 979         Data = 0x0c;
 980         status = 0;
 981         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 982
 983         //clearing rx_disable
 984         Data = 0x0;
 985         status = 0;
 986         status =
 987             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 988         Data = Data & ~0x20;
 989         status = 0;
 990         status =
 991             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 992
 993         // rx_negate
 994         Data = 0x0;
 995         status = 0;
 996         status =
 997             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 998         Data = Data | 0x10;
 999         status = 0;
1000         status =
1001             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
1002
1003         /* force low_latency on so that our tty_push actually forces *
1004          * the data through,otherwise it is scheduled, and with      *
1005          * high data rates (like with OHCI) data can get lost.       */
1006
1007         if (port->tty)
1008                 port->tty->low_latency = 1;
1009 /* Check to see if we've set up our endpoint info yet    *
1010      * (can't set it up in mos7840_startup as the structures *
1011      * were not set up at that time.)                        */
1012         if (mos7840_num_open_ports == 1) {
1013                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1014
1015                         /* set up interrupt urb */
1016
1017                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1018                                          serial->dev,
1019                                          usb_rcvintpipe(serial->dev,
1020                                                         serial->port[0]->
1021                                                         interrupt_in_endpointAddress),
1022                                          serial->port[0]->interrupt_in_buffer,
1023                                          serial->port[0]->interrupt_in_urb->
1024                                          transfer_buffer_length,
1025                                          mos7840_interrupt_callback,
1026                                          serial,
1027                                          serial->port[0]->interrupt_in_urb->
1028                                          interval);
1029
1030                         /* start interrupt read for mos7840               *
1031                          * will continue as long as mos7840 is connected  */
1032
1033                         response =
1034                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1035                                            GFP_KERNEL);
1036                         if (response) {
1037                                 err("%s - Error %d submitting interrupt urb",
1038                                     __FUNCTION__, response);
1039                         }
1040
1041                 }
1042
1043         }
1044
1045         /* see if we've set up our endpoint info yet   *
1046          * (can't set it up in mos7840_startup as the  *
1047          * structures were not set up at that time.)   */
1048
1049         dbg("port number is %d \n", port->number);
1050         dbg("serial number is %d \n", port->serial->minor);
1051         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1052         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1053         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1054         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1055         mos7840_port->read_urb = port->read_urb;
1056
1057         /* set up our bulk in urb */
1058
1059         usb_fill_bulk_urb(mos7840_port->read_urb,
1060                           serial->dev,
1061                           usb_rcvbulkpipe(serial->dev,
1062                                           port->bulk_in_endpointAddress),
1063                           port->bulk_in_buffer,
1064                           mos7840_port->read_urb->transfer_buffer_length,
1065                           mos7840_bulk_in_callback, mos7840_port);
1066
1067         dbg("mos7840_open: bulkin endpoint is %d\n",
1068             port->bulk_in_endpointAddress);
1069         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1070         if (response) {
1071                 err("%s - Error %d submitting control urb", __FUNCTION__,
1072                     response);
1073         }
1074
1075         /* initialize our wait queues */
1076         init_waitqueue_head(&mos7840_port->wait_chase);
1077         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1078
1079         /* initialize our icount structure */
1080         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1081
1082         /* initialize our port settings */
1083         mos7840_port->shadowMCR = MCR_MASTER_IE;        /* Must set to enable ints! */
1084         /* send a open port command */
1085         mos7840_port->open = 1;
1086         //mos7840_change_port_settings(mos7840_port,old_termios);
1087         mos7840_port->icount.tx = 0;
1088         mos7840_port->icount.rx = 0;
1089
1090         dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n", serial, mos7840_port, port);
1091
1092         return 0;
1093
1094 }
1095
1096 /*****************************************************************************
1097  * mos7840_chars_in_buffer
1098  *      this function is called by the tty driver when it wants to know how many
1099  *      bytes of data we currently have outstanding in the port (data that has
1100  *      been written, but hasn't made it out the port yet)
1101  *      If successful, we return the number of bytes left to be written in the
1102  *      system,
1103  *      Otherwise we return a negative error number.
1104  *****************************************************************************/
1105
1106 static int mos7840_chars_in_buffer(struct usb_serial_port *port)
1107 {
1108         int i;
1109         int chars = 0;
1110         struct moschip_port *mos7840_port;
1111
1112         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1113
1114         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1115                 dbg("%s", "Invalid port \n");
1116                 return -1;
1117         }
1118
1119         mos7840_port = mos7840_get_port_private(port);
1120         if (mos7840_port == NULL) {
1121                 dbg("%s \n", "mos7840_break:leaving ...........");
1122                 return -1;
1123         }
1124
1125         for (i = 0; i < NUM_URBS; ++i) {
1126                 if (mos7840_port->write_urb_pool[i]->status == -EINPROGRESS) {
1127                         chars += URB_TRANSFER_BUFFER_SIZE;
1128                 }
1129         }
1130         dbg("%s - returns %d", __FUNCTION__, chars);
1131         return (chars);
1132
1133 }
1134
1135 /************************************************************************
1136  *
1137  * mos7840_block_until_tx_empty
1138  *
1139  *      This function will block the close until one of the following:
1140  *              1. TX count are 0
1141  *              2. The mos7840 has stopped
1142  *              3. A timout of 3 seconds without activity has expired
1143  *
1144  ************************************************************************/
1145 static void mos7840_block_until_tx_empty(struct moschip_port *mos7840_port)
1146 {
1147         int timeout = HZ / 10;
1148         int wait = 30;
1149         int count;
1150
1151         while (1) {
1152
1153                 count = mos7840_chars_in_buffer(mos7840_port->port);
1154
1155                 /* Check for Buffer status */
1156                 if (count <= 0) {
1157                         return;
1158                 }
1159
1160                 /* Block the thread for a while */
1161                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1162                                                timeout);
1163
1164                 /* No activity.. count down section */
1165                 wait--;
1166                 if (wait == 0) {
1167                         dbg("%s - TIMEOUT", __FUNCTION__);
1168                         return;
1169                 } else {
1170                         /* Reset timout value back to seconds */
1171                         wait = 30;
1172                 }
1173         }
1174 }
1175
1176 /*****************************************************************************
1177  * mos7840_close
1178  *      this function is called by the tty driver when a port is closed
1179  *****************************************************************************/
1180
1181 static void mos7840_close(struct usb_serial_port *port, struct file *filp)
1182 {
1183         struct usb_serial *serial;
1184         struct moschip_port *mos7840_port;
1185         int j;
1186         __u16 Data;
1187
1188         dbg("%s\n", "mos7840_close:entering...");
1189
1190         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1191                 dbg("%s", "Port Paranoia failed \n");
1192                 return;
1193         }
1194
1195         serial = mos7840_get_usb_serial(port, __FUNCTION__);
1196         if (!serial) {
1197                 dbg("%s", "Serial Paranoia failed \n");
1198                 return;
1199         }
1200
1201         mos7840_port = mos7840_get_port_private(port);
1202
1203         if (mos7840_port == NULL) {
1204                 return;
1205         }
1206
1207         for (j = 0; j < NUM_URBS; ++j)
1208                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1209
1210         /* Freeing Write URBs */
1211         for (j = 0; j < NUM_URBS; ++j) {
1212                 if (mos7840_port->write_urb_pool[j]) {
1213                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1214                                 kfree(mos7840_port->write_urb_pool[j]->
1215                                       transfer_buffer);
1216
1217                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1218                 }
1219         }
1220
1221         if (serial->dev) {
1222                 /* flush and block until tx is empty */
1223                 mos7840_block_until_tx_empty(mos7840_port);
1224         }
1225
1226         /* While closing port, shutdown all bulk read, write  *
1227          * and interrupt read if they exists                  */
1228         if (serial->dev) {
1229
1230                 if (mos7840_port->write_urb) {
1231                         dbg("%s", "Shutdown bulk write\n");
1232                         usb_kill_urb(mos7840_port->write_urb);
1233                 }
1234
1235                 if (mos7840_port->read_urb) {
1236                         dbg("%s", "Shutdown bulk read\n");
1237                         usb_kill_urb(mos7840_port->read_urb);
1238                 }
1239                 if ((&mos7840_port->control_urb)) {
1240                         dbg("%s", "Shutdown control read\n");
1241                         //      usb_kill_urb (mos7840_port->control_urb);
1242
1243                 }
1244         }
1245 //              if(mos7840_port->ctrl_buf != NULL)
1246 //                      kfree(mos7840_port->ctrl_buf);
1247         mos7840_num_open_ports--;
1248         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1249             mos7840_num_open_ports, port->number);
1250         if (mos7840_num_open_ports == 0) {
1251                 if (serial->port[0]->interrupt_in_urb) {
1252                         dbg("%s", "Shutdown interrupt_in_urb\n");
1253                 }
1254         }
1255
1256         if (mos7840_port->write_urb) {
1257                 /* if this urb had a transfer buffer already (old tx) free it */
1258
1259                 if (mos7840_port->write_urb->transfer_buffer != NULL) {
1260                         kfree(mos7840_port->write_urb->transfer_buffer);
1261                 }
1262                 usb_free_urb(mos7840_port->write_urb);
1263         }
1264
1265         Data = 0x0;
1266         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1267
1268         Data = 0x00;
1269         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1270
1271         mos7840_port->open = 0;
1272
1273         dbg("%s \n", "Leaving ............");
1274 }
1275
1276 /************************************************************************
1277  *
1278  * mos7840_block_until_chase_response
1279  *
1280  *      This function will block the close until one of the following:
1281  *              1. Response to our Chase comes from mos7840
1282  *              2. A timout of 10 seconds without activity has expired
1283  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1284  *
1285  ************************************************************************/
1286
1287 static void mos7840_block_until_chase_response(struct moschip_port
1288                                                *mos7840_port)
1289 {
1290         int timeout = 1 * HZ;
1291         int wait = 10;
1292         int count;
1293
1294         while (1) {
1295                 count = mos7840_chars_in_buffer(mos7840_port->port);
1296
1297                 /* Check for Buffer status */
1298                 if (count <= 0) {
1299                         return;
1300                 }
1301
1302                 /* Block the thread for a while */
1303                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1304                                                timeout);
1305                 /* No activity.. count down section */
1306                 wait--;
1307                 if (wait == 0) {
1308                         dbg("%s - TIMEOUT", __FUNCTION__);
1309                         return;
1310                 } else {
1311                         /* Reset timout value back to seconds */
1312                         wait = 10;
1313                 }
1314         }
1315
1316 }
1317
1318 /*****************************************************************************
1319  * mos7840_break
1320  *      this function sends a break to the port
1321  *****************************************************************************/
1322 static void mos7840_break(struct usb_serial_port *port, int break_state)
1323 {
1324         unsigned char data;
1325         struct usb_serial *serial;
1326         struct moschip_port *mos7840_port;
1327
1328         dbg("%s \n", "Entering ...........");
1329         dbg("mos7840_break: Start\n");
1330
1331         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1332                 dbg("%s", "Port Paranoia failed \n");
1333                 return;
1334         }
1335
1336         serial = mos7840_get_usb_serial(port, __FUNCTION__);
1337         if (!serial) {
1338                 dbg("%s", "Serial Paranoia failed \n");
1339                 return;
1340         }
1341
1342         mos7840_port = mos7840_get_port_private(port);
1343
1344         if (mos7840_port == NULL) {
1345                 return;
1346         }
1347
1348         if (serial->dev) {
1349
1350                 /* flush and block until tx is empty */
1351                 mos7840_block_until_chase_response(mos7840_port);
1352         }
1353
1354         if (break_state == -1) {
1355                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1356         } else {
1357                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1358         }
1359
1360         mos7840_port->shadowLCR = data;
1361         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1362             mos7840_port->shadowLCR);
1363         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1364                              mos7840_port->shadowLCR);
1365
1366         return;
1367 }
1368
1369 /*****************************************************************************
1370  * mos7840_write_room
1371  *      this function is called by the tty driver when it wants to know how many
1372  *      bytes of data we can accept for a specific port.
1373  *      If successful, we return the amount of room that we have for this port
1374  *      Otherwise we return a negative error number.
1375  *****************************************************************************/
1376
1377 static int mos7840_write_room(struct usb_serial_port *port)
1378 {
1379         int i;
1380         int room = 0;
1381         struct moschip_port *mos7840_port;
1382
1383         dbg("%s \n", " mos7840_write_room:entering ...........");
1384
1385         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1386                 dbg("%s", "Invalid port \n");
1387                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1388                 return -1;
1389         }
1390
1391         mos7840_port = mos7840_get_port_private(port);
1392         if (mos7840_port == NULL) {
1393                 dbg("%s \n", "mos7840_break:leaving ...........");
1394                 return -1;
1395         }
1396
1397         for (i = 0; i < NUM_URBS; ++i) {
1398                 if (mos7840_port->write_urb_pool[i]->status != -EINPROGRESS) {
1399                         room += URB_TRANSFER_BUFFER_SIZE;
1400                 }
1401         }
1402
1403         dbg("%s - returns %d", __FUNCTION__, room);
1404         return (room);
1405
1406 }
1407
1408 /*****************************************************************************
1409  * mos7840_write
1410  *      this function is called by the tty driver when data should be written to
1411  *      the port.
1412  *      If successful, we return the number of bytes written, otherwise we
1413  *      return a negative error number.
1414  *****************************************************************************/
1415
1416 static int mos7840_write(struct usb_serial_port *port,
1417                          const unsigned char *data, int count)
1418 {
1419         int status;
1420         int i;
1421         int bytes_sent = 0;
1422         int transfer_size;
1423
1424         struct moschip_port *mos7840_port;
1425         struct usb_serial *serial;
1426         struct urb *urb;
1427         //__u16 Data;
1428         const unsigned char *current_position = data;
1429         unsigned char *data1;
1430         dbg("%s \n", "entering ...........");
1431         //dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",mos7840_port->shadowLCR);
1432
1433 #ifdef NOTMOS7840
1434         Data = 0x00;
1435         status = 0;
1436         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1437         mos7840_port->shadowLCR = Data;
1438         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1439         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1440             mos7840_port->shadowLCR);
1441
1442         //Data = 0x03;
1443         //status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data);
1444         //mos7840_port->shadowLCR=Data;//Need to add later
1445
1446         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
1447         status = 0;
1448         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1449
1450         //Data = 0x0c;
1451         //status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data);
1452         Data = 0x00;
1453         status = 0;
1454         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1455         dbg("mos7840_write:DLL value is %x\n", Data);
1456
1457         Data = 0x0;
1458         status = 0;
1459         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1460         dbg("mos7840_write:DLM value is %x\n", Data);
1461
1462         Data = Data & ~SERIAL_LCR_DLAB;
1463         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1464             mos7840_port->shadowLCR);
1465         status = 0;
1466         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1467 #endif
1468
1469         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1470                 dbg("%s", "Port Paranoia failed \n");
1471                 return -1;
1472         }
1473
1474         serial = port->serial;
1475         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
1476                 dbg("%s", "Serial Paranoia failed \n");
1477                 return -1;
1478         }
1479
1480         mos7840_port = mos7840_get_port_private(port);
1481         if (mos7840_port == NULL) {
1482                 dbg("%s", "mos7840_port is NULL\n");
1483                 return -1;
1484         }
1485
1486         /* try to find a free urb in the list */
1487         urb = NULL;
1488
1489         for (i = 0; i < NUM_URBS; ++i) {
1490                 if (mos7840_port->write_urb_pool[i]->status != -EINPROGRESS) {
1491                         urb = mos7840_port->write_urb_pool[i];
1492                         dbg("\nURB:%d", i);
1493                         break;
1494                 }
1495         }
1496
1497         if (urb == NULL) {
1498                 dbg("%s - no more free urbs", __FUNCTION__);
1499                 goto exit;
1500         }
1501
1502         if (urb->transfer_buffer == NULL) {
1503                 urb->transfer_buffer =
1504                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1505
1506                 if (urb->transfer_buffer == NULL) {
1507                         err("%s no more kernel memory...", __FUNCTION__);
1508                         goto exit;
1509                 }
1510         }
1511         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1512
1513         memcpy(urb->transfer_buffer, current_position, transfer_size);
1514
1515         /* fill urb with data and submit  */
1516         usb_fill_bulk_urb(urb,
1517                           serial->dev,
1518                           usb_sndbulkpipe(serial->dev,
1519                                           port->bulk_out_endpointAddress),
1520                           urb->transfer_buffer,
1521                           transfer_size,
1522                           mos7840_bulk_out_data_callback, mos7840_port);
1523
1524         data1 = urb->transfer_buffer;
1525         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1526
1527         /* send it down the pipe */
1528         status = usb_submit_urb(urb, GFP_ATOMIC);
1529
1530         if (status) {
1531                 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1532                     __FUNCTION__, status);
1533                 bytes_sent = status;
1534                 goto exit;
1535         }
1536         bytes_sent = transfer_size;
1537         mos7840_port->icount.tx += transfer_size;
1538         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1539       exit:
1540
1541         return bytes_sent;
1542
1543 }
1544
1545 /*****************************************************************************
1546  * mos7840_throttle
1547  *      this function is called by the tty driver when it wants to stop the data
1548  *      being read from the port.
1549  *****************************************************************************/
1550
1551 static void mos7840_throttle(struct usb_serial_port *port)
1552 {
1553         struct moschip_port *mos7840_port;
1554         struct tty_struct *tty;
1555         int status;
1556
1557         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1558                 dbg("%s", "Invalid port \n");
1559                 return;
1560         }
1561
1562         dbg("- port %d\n", port->number);
1563
1564         mos7840_port = mos7840_get_port_private(port);
1565
1566         if (mos7840_port == NULL)
1567                 return;
1568
1569         if (!mos7840_port->open) {
1570                 dbg("%s\n", "port not opened");
1571                 return;
1572         }
1573
1574         dbg("%s", "Entering .......... \n");
1575
1576         tty = port->tty;
1577         if (!tty) {
1578                 dbg("%s - no tty available", __FUNCTION__);
1579                 return;
1580         }
1581
1582         /* if we are implementing XON/XOFF, send the stop character */
1583         if (I_IXOFF(tty)) {
1584                 unsigned char stop_char = STOP_CHAR(tty);
1585                 status = mos7840_write(port, &stop_char, 1);
1586                 if (status <= 0) {
1587                         return;
1588                 }
1589         }
1590
1591         /* if we are implementing RTS/CTS, toggle that line */
1592         if (tty->termios->c_cflag & CRTSCTS) {
1593                 mos7840_port->shadowMCR &= ~MCR_RTS;
1594                 status = 0;
1595                 status =
1596                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1597                                          mos7840_port->shadowMCR);
1598
1599                 if (status < 0) {
1600                         return;
1601                 }
1602         }
1603
1604         return;
1605 }
1606
1607 /*****************************************************************************
1608  * mos7840_unthrottle
1609  *      this function is called by the tty driver when it wants to resume the data
1610  *      being read from the port (called after SerialThrottle is called)
1611  *****************************************************************************/
1612 static void mos7840_unthrottle(struct usb_serial_port *port)
1613 {
1614         struct tty_struct *tty;
1615         int status;
1616         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1617
1618         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1619                 dbg("%s", "Invalid port \n");
1620                 return;
1621         }
1622
1623         if (mos7840_port == NULL)
1624                 return;
1625
1626         if (!mos7840_port->open) {
1627                 dbg("%s - port not opened", __FUNCTION__);
1628                 return;
1629         }
1630
1631         dbg("%s", "Entering .......... \n");
1632
1633         tty = port->tty;
1634         if (!tty) {
1635                 dbg("%s - no tty available", __FUNCTION__);
1636                 return;
1637         }
1638
1639         /* if we are implementing XON/XOFF, send the start character */
1640         if (I_IXOFF(tty)) {
1641                 unsigned char start_char = START_CHAR(tty);
1642                 status = mos7840_write(port, &start_char, 1);
1643                 if (status <= 0) {
1644                         return;
1645                 }
1646         }
1647
1648         /* if we are implementing RTS/CTS, toggle that line */
1649         if (tty->termios->c_cflag & CRTSCTS) {
1650                 mos7840_port->shadowMCR |= MCR_RTS;
1651                 status = 0;
1652                 status =
1653                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1654                                          mos7840_port->shadowMCR);
1655                 if (status < 0) {
1656                         return;
1657                 }
1658         }
1659
1660         return;
1661 }
1662
1663 static int mos7840_tiocmget(struct usb_serial_port *port, struct file *file)
1664 {
1665         struct moschip_port *mos7840_port;
1666         unsigned int result;
1667         __u16 msr;
1668         __u16 mcr;
1669         int status = 0;
1670         mos7840_port = mos7840_get_port_private(port);
1671
1672         dbg("%s - port %d", __FUNCTION__, port->number);
1673
1674         if (mos7840_port == NULL)
1675                 return -ENODEV;
1676
1677         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1678         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1679         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1680             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1681             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1682             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1683             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1684             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1685             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1686
1687         dbg("%s - 0x%04X", __FUNCTION__, result);
1688
1689         return result;
1690 }
1691
1692 static int mos7840_tiocmset(struct usb_serial_port *port, struct file *file,
1693                             unsigned int set, unsigned int clear)
1694 {
1695         struct moschip_port *mos7840_port;
1696         unsigned int mcr;
1697         unsigned int status;
1698
1699         dbg("%s - port %d", __FUNCTION__, port->number);
1700
1701         mos7840_port = mos7840_get_port_private(port);
1702
1703         if (mos7840_port == NULL)
1704                 return -ENODEV;
1705
1706         mcr = mos7840_port->shadowMCR;
1707         if (clear & TIOCM_RTS)
1708                 mcr &= ~MCR_RTS;
1709         if (clear & TIOCM_DTR)
1710                 mcr &= ~MCR_DTR;
1711         if (clear & TIOCM_LOOP)
1712                 mcr &= ~MCR_LOOPBACK;
1713
1714         if (set & TIOCM_RTS)
1715                 mcr |= MCR_RTS;
1716         if (set & TIOCM_DTR)
1717                 mcr |= MCR_DTR;
1718         if (set & TIOCM_LOOP)
1719                 mcr |= MCR_LOOPBACK;
1720
1721         mos7840_port->shadowMCR = mcr;
1722
1723         status = 0;
1724         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1725         if (status < 0) {
1726                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1727                 return -1;
1728         }
1729
1730         return 0;
1731 }
1732
1733 /*****************************************************************************
1734  * mos7840_calc_baud_rate_divisor
1735  *      this function calculates the proper baud rate divisor for the specified
1736  *      baud rate.
1737  *****************************************************************************/
1738 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1739                                           __u16 * clk_sel_val)
1740 {
1741
1742         dbg("%s - %d", __FUNCTION__, baudRate);
1743
1744         if (baudRate <= 115200) {
1745                 *divisor = 115200 / baudRate;
1746                 *clk_sel_val = 0x0;
1747         }
1748         if ((baudRate > 115200) && (baudRate <= 230400)) {
1749                 *divisor = 230400 / baudRate;
1750                 *clk_sel_val = 0x10;
1751         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1752                 *divisor = 403200 / baudRate;
1753                 *clk_sel_val = 0x20;
1754         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1755                 *divisor = 460800 / baudRate;
1756                 *clk_sel_val = 0x30;
1757         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1758                 *divisor = 806400 / baudRate;
1759                 *clk_sel_val = 0x40;
1760         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1761                 *divisor = 921600 / baudRate;
1762                 *clk_sel_val = 0x50;
1763         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1764                 *divisor = 1572864 / baudRate;
1765                 *clk_sel_val = 0x60;
1766         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1767                 *divisor = 3145728 / baudRate;
1768                 *clk_sel_val = 0x70;
1769         }
1770         return 0;
1771
1772 #ifdef NOTMCS7840
1773
1774         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1775                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1776                         *divisor = mos7840_divisor_table[i].Divisor;
1777                         return 0;
1778                 }
1779         }
1780
1781         /* After trying for all the standard baud rates    *
1782          * Try calculating the divisor for this baud rate  */
1783
1784         if (baudrate > 75 && baudrate < 230400) {
1785                 /* get the divisor */
1786                 custom = (__u16) (230400L / baudrate);
1787
1788                 /* Check for round off */
1789                 round1 = (__u16) (2304000L / baudrate);
1790                 round = (__u16) (round1 - (custom * 10));
1791                 if (round > 4) {
1792                         custom++;
1793                 }
1794                 *divisor = custom;
1795
1796                 dbg(" Baud %d = %d\n", baudrate, custom);
1797                 return 0;
1798         }
1799
1800         dbg("%s\n", " Baud calculation Failed...");
1801         return -1;
1802 #endif
1803 }
1804
1805 /*****************************************************************************
1806  * mos7840_send_cmd_write_baud_rate
1807  *      this function sends the proper command to change the baud rate of the
1808  *      specified port.
1809  *****************************************************************************/
1810
1811 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1812                                             int baudRate)
1813 {
1814         int divisor = 0;
1815         int status;
1816         __u16 Data;
1817         unsigned char number;
1818         __u16 clk_sel_val;
1819         struct usb_serial_port *port;
1820
1821         if (mos7840_port == NULL)
1822                 return -1;
1823
1824         port = (struct usb_serial_port *)mos7840_port->port;
1825         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1826                 dbg("%s", "Invalid port \n");
1827                 return -1;
1828         }
1829
1830         if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1831                 dbg("%s", "Invalid Serial \n");
1832                 return -1;
1833         }
1834
1835         dbg("%s", "Entering .......... \n");
1836
1837         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1838
1839         dbg("%s - port = %d, baud = %d", __FUNCTION__,
1840             mos7840_port->port->number, baudRate);
1841         //reset clk_uart_sel in spregOffset
1842         if (baudRate > 115200) {
1843 #ifdef HW_flow_control
1844                 //NOTE: need to see the pther register to modify
1845                 //setting h/w flow control bit to 1;
1846                 status = 0;
1847                 Data = 0x2b;
1848                 mos7840_port->shadowMCR = Data;
1849                 status =
1850                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1851                 if (status < 0) {
1852                         dbg("Writing spreg failed in set_serial_baud\n");
1853                         return -1;
1854                 }
1855 #endif
1856
1857         } else {
1858 #ifdef HW_flow_control
1859                 //setting h/w flow control bit to 0;
1860                 status = 0;
1861                 Data = 0xb;
1862                 mos7840_port->shadowMCR = Data;
1863                 status =
1864                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1865                 if (status < 0) {
1866                         dbg("Writing spreg failed in set_serial_baud\n");
1867                         return -1;
1868                 }
1869 #endif
1870
1871         }
1872
1873         if (1)                  //baudRate <= 115200)
1874         {
1875                 clk_sel_val = 0x0;
1876                 Data = 0x0;
1877                 status = 0;
1878                 status =
1879                     mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1880                                                    &clk_sel_val);
1881                 status =
1882                     mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1883                                          &Data);
1884                 if (status < 0) {
1885                         dbg("reading spreg failed in set_serial_baud\n");
1886                         return -1;
1887                 }
1888                 Data = (Data & 0x8f) | clk_sel_val;
1889                 status = 0;
1890                 status =
1891                     mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1892                 if (status < 0) {
1893                         dbg("Writing spreg failed in set_serial_baud\n");
1894                         return -1;
1895                 }
1896                 /* Calculate the Divisor */
1897
1898                 if (status) {
1899                         err("%s - bad baud rate", __FUNCTION__);
1900                         dbg("%s\n", "bad baud rate");
1901                         return status;
1902                 }
1903                 /* Enable access to divisor latch */
1904                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1905                 mos7840_port->shadowLCR = Data;
1906                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1907
1908                 /* Write the divisor */
1909                 Data = (unsigned char)(divisor & 0xff);
1910                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1911                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1912
1913                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1914                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1915                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1916
1917                 /* Disable access to divisor latch */
1918                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1919                 mos7840_port->shadowLCR = Data;
1920                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1921
1922         }
1923
1924         return status;
1925 }
1926
1927 /*****************************************************************************
1928  * mos7840_change_port_settings
1929  *      This routine is called to set the UART on the device to match
1930  *      the specified new settings.
1931  *****************************************************************************/
1932
1933 static void mos7840_change_port_settings(struct moschip_port *mos7840_port,
1934                                          struct ktermios *old_termios)
1935 {
1936         struct tty_struct *tty;
1937         int baud;
1938         unsigned cflag;
1939         unsigned iflag;
1940         __u8 lData;
1941         __u8 lParity;
1942         __u8 lStop;
1943         int status;
1944         __u16 Data;
1945         struct usb_serial_port *port;
1946         struct usb_serial *serial;
1947
1948         if (mos7840_port == NULL)
1949                 return;
1950
1951         port = (struct usb_serial_port *)mos7840_port->port;
1952
1953         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1954                 dbg("%s", "Invalid port \n");
1955                 return;
1956         }
1957
1958         if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1959                 dbg("%s", "Invalid Serial \n");
1960                 return;
1961         }
1962
1963         serial = port->serial;
1964
1965         dbg("%s - port %d", __FUNCTION__, mos7840_port->port->number);
1966
1967         if (!mos7840_port->open) {
1968                 dbg("%s - port not opened", __FUNCTION__);
1969                 return;
1970         }
1971
1972         tty = mos7840_port->port->tty;
1973
1974         if ((!tty) || (!tty->termios)) {
1975                 dbg("%s - no tty structures", __FUNCTION__);
1976                 return;
1977         }
1978
1979         dbg("%s", "Entering .......... \n");
1980
1981         lData = LCR_BITS_8;
1982         lStop = LCR_STOP_1;
1983         lParity = LCR_PAR_NONE;
1984
1985         cflag = tty->termios->c_cflag;
1986         iflag = tty->termios->c_iflag;
1987
1988         /* Change the number of bits */
1989         if (cflag & CSIZE) {
1990                 switch (cflag & CSIZE) {
1991                 case CS5:
1992                         lData = LCR_BITS_5;
1993                         break;
1994
1995                 case CS6:
1996                         lData = LCR_BITS_6;
1997                         break;
1998
1999                 case CS7:
2000                         lData = LCR_BITS_7;
2001                         break;
2002                 default:
2003                 case CS8:
2004                         lData = LCR_BITS_8;
2005                         break;
2006                 }
2007         }
2008         /* Change the Parity bit */
2009         if (cflag & PARENB) {
2010                 if (cflag & PARODD) {
2011                         lParity = LCR_PAR_ODD;
2012                         dbg("%s - parity = odd", __FUNCTION__);
2013                 } else {
2014                         lParity = LCR_PAR_EVEN;
2015                         dbg("%s - parity = even", __FUNCTION__);
2016                 }
2017
2018         } else {
2019                 dbg("%s - parity = none", __FUNCTION__);
2020         }
2021
2022         if (cflag & CMSPAR) {
2023                 lParity = lParity | 0x20;
2024         }
2025
2026         /* Change the Stop bit */
2027         if (cflag & CSTOPB) {
2028                 lStop = LCR_STOP_2;
2029                 dbg("%s - stop bits = 2", __FUNCTION__);
2030         } else {
2031                 lStop = LCR_STOP_1;
2032                 dbg("%s - stop bits = 1", __FUNCTION__);
2033         }
2034
2035         /* Update the LCR with the correct value */
2036         mos7840_port->shadowLCR &=
2037             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2038         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2039
2040         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2041             mos7840_port->shadowLCR);
2042         /* Disable Interrupts */
2043         Data = 0x00;
2044         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2045
2046         Data = 0x00;
2047         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2048
2049         Data = 0xcf;
2050         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2051
2052         /* Send the updated LCR value to the mos7840 */
2053         Data = mos7840_port->shadowLCR;
2054
2055         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2056
2057         Data = 0x00b;
2058         mos7840_port->shadowMCR = Data;
2059         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2060         Data = 0x00b;
2061         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2062
2063         /* set up the MCR register and send it to the mos7840 */
2064
2065         mos7840_port->shadowMCR = MCR_MASTER_IE;
2066         if (cflag & CBAUD) {
2067                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2068         }
2069
2070         if (cflag & CRTSCTS) {
2071                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2072
2073         } else {
2074                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2075         }
2076
2077         Data = mos7840_port->shadowMCR;
2078         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2079
2080         /* Determine divisor based on baud rate */
2081         baud = tty_get_baud_rate(tty);
2082
2083         if (!baud) {
2084                 /* pick a default, any default... */
2085                 dbg("%s\n", "Picked default baud...");
2086                 baud = 9600;
2087         }
2088
2089         dbg("%s - baud rate = %d", __FUNCTION__, baud);
2090         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2091
2092         /* Enable Interrupts */
2093         Data = 0x0c;
2094         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2095
2096         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2097                 mos7840_port->read_urb->dev = serial->dev;
2098
2099                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2100
2101                 if (status) {
2102                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2103                             status);
2104                 }
2105         }
2106         wake_up(&mos7840_port->delta_msr_wait);
2107         mos7840_port->delta_msr_cond = 1;
2108         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2109             mos7840_port->shadowLCR);
2110
2111         return;
2112 }
2113
2114 /*****************************************************************************
2115  * mos7840_set_termios
2116  *      this function is called by the tty driver when it wants to change
2117  *      the termios structure
2118  *****************************************************************************/
2119
2120 static void mos7840_set_termios(struct usb_serial_port *port,
2121                                 struct ktermios *old_termios)
2122 {
2123         int status;
2124         unsigned int cflag;
2125         struct usb_serial *serial;
2126         struct moschip_port *mos7840_port;
2127         struct tty_struct *tty;
2128         dbg("mos7840_set_termios: START\n");
2129         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2130                 dbg("%s", "Invalid port \n");
2131                 return;
2132         }
2133
2134         serial = port->serial;
2135
2136         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
2137                 dbg("%s", "Invalid Serial \n");
2138                 return;
2139         }
2140
2141         mos7840_port = mos7840_get_port_private(port);
2142
2143         if (mos7840_port == NULL)
2144                 return;
2145
2146         tty = port->tty;
2147
2148         if (!port->tty || !port->tty->termios) {
2149                 dbg("%s - no tty or termios", __FUNCTION__);
2150                 return;
2151         }
2152
2153         if (!mos7840_port->open) {
2154                 dbg("%s - port not opened", __FUNCTION__);
2155                 return;
2156         }
2157
2158         dbg("%s\n", "setting termios - ");
2159
2160         cflag = tty->termios->c_cflag;
2161
2162         if (!cflag) {
2163                 dbg("%s %s\n", __FUNCTION__, "cflag is NULL");
2164                 return;
2165         }
2166
2167         /* check that they really want us to change something */
2168         if (old_termios) {
2169                 if ((cflag == old_termios->c_cflag) &&
2170                     (RELEVANT_IFLAG(tty->termios->c_iflag) ==
2171                      RELEVANT_IFLAG(old_termios->c_iflag))) {
2172                         dbg("%s\n", "Nothing to change");
2173                         return;
2174                 }
2175         }
2176
2177         dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
2178             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2179
2180         if (old_termios) {
2181                 dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
2182                     old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2183         }
2184
2185         dbg("%s - port %d", __FUNCTION__, port->number);
2186
2187         /* change the port settings to the new ones specified */
2188
2189         mos7840_change_port_settings(mos7840_port, old_termios);
2190
2191         if (!mos7840_port->read_urb) {
2192                 dbg("%s", "URB KILLED !!!!!\n");
2193                 return;
2194         }
2195
2196         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2197                 mos7840_port->read_urb->dev = serial->dev;
2198                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2199                 if (status) {
2200                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2201                             status);
2202                 }
2203         }
2204         return;
2205 }
2206
2207 /*****************************************************************************
2208  * mos7840_get_lsr_info - get line status register info
2209  *
2210  * Purpose: Let user call ioctl() to get info when the UART physically
2211  *          is emptied.  On bus types like RS485, the transmitter must
2212  *          release the bus after transmitting. This must be done when
2213  *          the transmit shift register is empty, not be done when the
2214  *          transmit holding register is empty.  This functionality
2215  *          allows an RS485 driver to be written in user space.
2216  *****************************************************************************/
2217
2218 static int mos7840_get_lsr_info(struct moschip_port *mos7840_port,
2219                                 unsigned int __user *value)
2220 {
2221         int count;
2222         unsigned int result = 0;
2223
2224         count = mos7840_chars_in_buffer(mos7840_port->port);
2225         if (count == 0) {
2226                 dbg("%s -- Empty", __FUNCTION__);
2227                 result = TIOCSER_TEMT;
2228         }
2229
2230         if (copy_to_user(value, &result, sizeof(int)))
2231                 return -EFAULT;
2232         return 0;
2233 }
2234
2235 /*****************************************************************************
2236  * mos7840_get_bytes_avail - get number of bytes available
2237  *
2238  * Purpose: Let user call ioctl to get the count of number of bytes available.
2239  *****************************************************************************/
2240
2241 static int mos7840_get_bytes_avail(struct moschip_port *mos7840_port,
2242                                    unsigned int __user *value)
2243 {
2244         unsigned int result = 0;
2245         struct tty_struct *tty = mos7840_port->port->tty;
2246
2247         if (!tty)
2248                 return -ENOIOCTLCMD;
2249
2250         result = tty->read_cnt;
2251
2252         dbg("%s(%d) = %d", __FUNCTION__, mos7840_port->port->number, result);
2253         if (copy_to_user(value, &result, sizeof(int)))
2254                 return -EFAULT;
2255
2256         return -ENOIOCTLCMD;
2257 }
2258
2259 /*****************************************************************************
2260  * mos7840_set_modem_info
2261  *      function to set modem info
2262  *****************************************************************************/
2263
2264 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2265                                   unsigned int cmd, unsigned int __user *value)
2266 {
2267         unsigned int mcr;
2268         unsigned int arg;
2269         __u16 Data;
2270         int status;
2271         struct usb_serial_port *port;
2272
2273         if (mos7840_port == NULL)
2274                 return -1;
2275
2276         port = (struct usb_serial_port *)mos7840_port->port;
2277         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2278                 dbg("%s", "Invalid port \n");
2279                 return -1;
2280         }
2281
2282         mcr = mos7840_port->shadowMCR;
2283
2284         if (copy_from_user(&arg, value, sizeof(int)))
2285                 return -EFAULT;
2286
2287         switch (cmd) {
2288         case TIOCMBIS:
2289                 if (arg & TIOCM_RTS)
2290                         mcr |= MCR_RTS;
2291                 if (arg & TIOCM_DTR)
2292                         mcr |= MCR_RTS;
2293                 if (arg & TIOCM_LOOP)
2294                         mcr |= MCR_LOOPBACK;
2295                 break;
2296
2297         case TIOCMBIC:
2298                 if (arg & TIOCM_RTS)
2299                         mcr &= ~MCR_RTS;
2300                 if (arg & TIOCM_DTR)
2301                         mcr &= ~MCR_RTS;
2302                 if (arg & TIOCM_LOOP)
2303                         mcr &= ~MCR_LOOPBACK;
2304                 break;
2305
2306         case TIOCMSET:
2307                 /* turn off the RTS and DTR and LOOPBACK
2308                  * and then only turn on what was asked to */
2309                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2310                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2311                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2312                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2313                 break;
2314         }
2315
2316         mos7840_port->shadowMCR = mcr;
2317
2318         Data = mos7840_port->shadowMCR;
2319         status = 0;
2320         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2321         if (status < 0) {
2322                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2323                 return -1;
2324         }
2325
2326         return 0;
2327 }
2328
2329 /*****************************************************************************
2330  * mos7840_get_modem_info
2331  *      function to get modem info
2332  *****************************************************************************/
2333
2334 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2335                                   unsigned int __user *value)
2336 {
2337         unsigned int result = 0;
2338         __u16 msr;
2339         unsigned int mcr = mos7840_port->shadowMCR;
2340         int status = 0;
2341         status =
2342             mos7840_get_uart_reg(mos7840_port->port, MODEM_STATUS_REGISTER,
2343                                  &msr);
2344         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2345             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2346             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2347             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2348             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2349             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2350
2351         dbg("%s -- %x", __FUNCTION__, result);
2352
2353         if (copy_to_user(value, &result, sizeof(int)))
2354                 return -EFAULT;
2355         return 0;
2356 }
2357
2358 /*****************************************************************************
2359  * mos7840_get_serial_info
2360  *      function to get information about serial port
2361  *****************************************************************************/
2362
2363 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2364                                    struct serial_struct __user *retinfo)
2365 {
2366         struct serial_struct tmp;
2367
2368         if (mos7840_port == NULL)
2369                 return -1;
2370
2371         if (!retinfo)
2372                 return -EFAULT;
2373
2374         memset(&tmp, 0, sizeof(tmp));
2375
2376         tmp.type = PORT_16550A;
2377         tmp.line = mos7840_port->port->serial->minor;
2378         tmp.port = mos7840_port->port->number;
2379         tmp.irq = 0;
2380         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2381         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2382         tmp.baud_base = 9600;
2383         tmp.close_delay = 5 * HZ;
2384         tmp.closing_wait = 30 * HZ;
2385
2386         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2387                 return -EFAULT;
2388         return 0;
2389 }
2390
2391 /*****************************************************************************
2392  * SerialIoctl
2393  *      this function handles any ioctl calls to the driver
2394  *****************************************************************************/
2395
2396 static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
2397                          unsigned int cmd, unsigned long arg)
2398 {
2399         void __user *argp = (void __user *)arg;
2400         struct moschip_port *mos7840_port;
2401         struct tty_struct *tty;
2402
2403         struct async_icount cnow;
2404         struct async_icount cprev;
2405         struct serial_icounter_struct icount;
2406         int mosret = 0;
2407         int retval;
2408         struct tty_ldisc *ld;
2409
2410         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2411                 dbg("%s", "Invalid port \n");
2412                 return -1;
2413         }
2414
2415         mos7840_port = mos7840_get_port_private(port);
2416
2417         if (mos7840_port == NULL)
2418                 return -1;
2419
2420         tty = mos7840_port->port->tty;
2421
2422         dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
2423
2424         switch (cmd) {
2425                 /* return number of bytes available */
2426
2427         case TIOCINQ:
2428                 dbg("%s (%d) TIOCINQ", __FUNCTION__, port->number);
2429                 return mos7840_get_bytes_avail(mos7840_port, argp);
2430
2431         case TIOCOUTQ:
2432                 dbg("%s (%d) TIOCOUTQ", __FUNCTION__, port->number);
2433                 return put_user(tty->driver->chars_in_buffer ?
2434                                 tty->driver->chars_in_buffer(tty) : 0,
2435                                 (int __user *)arg);
2436
2437         case TCFLSH:
2438                 retval = tty_check_change(tty);
2439                 if (retval)
2440                         return retval;
2441
2442                 ld = tty_ldisc_ref(tty);
2443                 switch (arg) {
2444                 case TCIFLUSH:
2445                         if (ld && ld->flush_buffer)
2446                                 ld->flush_buffer(tty);
2447                         break;
2448                 case TCIOFLUSH:
2449                         if (ld && ld->flush_buffer)
2450                                 ld->flush_buffer(tty);
2451                         /* fall through */
2452                 case TCOFLUSH:
2453                         if (tty->driver->flush_buffer)
2454                                 tty->driver->flush_buffer(tty);
2455                         break;
2456                 default:
2457                         tty_ldisc_deref(ld);
2458                         return -EINVAL;
2459                 }
2460                 tty_ldisc_deref(ld);
2461                 return 0;
2462
2463         case TCGETS:
2464                 if (kernel_termios_to_user_termios
2465                     ((struct termios __user *)argp, tty->termios))
2466                         return -EFAULT;
2467                 return 0;
2468
2469         case TIOCSERGETLSR:
2470                 dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__, port->number);
2471                 return mos7840_get_lsr_info(mos7840_port, argp);
2472                 return 0;
2473
2474         case TIOCMBIS:
2475         case TIOCMBIC:
2476         case TIOCMSET:
2477                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,
2478                     port->number);
2479                 mosret =
2480                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2481                 return mosret;
2482
2483         case TIOCMGET:
2484                 dbg("%s (%d) TIOCMGET", __FUNCTION__, port->number);
2485                 return mos7840_get_modem_info(mos7840_port, argp);
2486
2487         case TIOCGSERIAL:
2488                 dbg("%s (%d) TIOCGSERIAL", __FUNCTION__, port->number);
2489                 return mos7840_get_serial_info(mos7840_port, argp);
2490
2491         case TIOCSSERIAL:
2492                 dbg("%s (%d) TIOCSSERIAL", __FUNCTION__, port->number);
2493                 break;
2494
2495         case TIOCMIWAIT:
2496                 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
2497                 cprev = mos7840_port->icount;
2498                 while (1) {
2499                         //interruptible_sleep_on(&mos7840_port->delta_msr_wait);
2500                         mos7840_port->delta_msr_cond = 0;
2501                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2502                                                  (mos7840_port->
2503                                                   delta_msr_cond == 1));
2504
2505                         /* see if a signal did it */
2506                         if (signal_pending(current))
2507                                 return -ERESTARTSYS;
2508                         cnow = mos7840_port->icount;
2509                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2510                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2511                                 return -EIO;    /* no change => error */
2512                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2513                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2514                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2515                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2516                                 return 0;
2517                         }
2518                         cprev = cnow;
2519                 }
2520                 /* NOTREACHED */
2521                 break;
2522
2523         case TIOCGICOUNT:
2524                 cnow = mos7840_port->icount;
2525                 icount.cts = cnow.cts;
2526                 icount.dsr = cnow.dsr;
2527                 icount.rng = cnow.rng;
2528                 icount.dcd = cnow.dcd;
2529                 icount.rx = cnow.rx;
2530                 icount.tx = cnow.tx;
2531                 icount.frame = cnow.frame;
2532                 icount.overrun = cnow.overrun;
2533                 icount.parity = cnow.parity;
2534                 icount.brk = cnow.brk;
2535                 icount.buf_overrun = cnow.buf_overrun;
2536
2537                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,
2538                     port->number, icount.rx, icount.tx);
2539                 if (copy_to_user(argp, &icount, sizeof(icount)))
2540                         return -EFAULT;
2541                 return 0;
2542
2543         case TIOCEXBAUD:
2544                 return 0;
2545         default:
2546                 break;
2547         }
2548
2549         return -ENOIOCTLCMD;
2550 }
2551
2552 static int mos7840_calc_num_ports(struct usb_serial *serial)
2553 {
2554
2555         dbg("numberofendpoints: %d \n",
2556             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2557         dbg("numberofendpoints: %d \n",
2558             (int)serial->interface->altsetting->desc.bNumEndpoints);
2559         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2560                 mos7840_num_ports = 2;
2561                 serial->type->num_ports = 2;
2562         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2563                 mos7840_num_ports = 4;
2564                 serial->type->num_bulk_in = 4;
2565                 serial->type->num_bulk_out = 4;
2566                 serial->type->num_ports = 4;
2567         }
2568
2569         return mos7840_num_ports;
2570 }
2571
2572 /****************************************************************************
2573  * mos7840_startup
2574  ****************************************************************************/
2575
2576 static int mos7840_startup(struct usb_serial *serial)
2577 {
2578         struct moschip_port *mos7840_port;
2579         struct usb_device *dev;
2580         int i, status;
2581
2582         __u16 Data;
2583         dbg("%s \n", " mos7840_startup :entering..........");
2584
2585         if (!serial) {
2586                 dbg("%s\n", "Invalid Handler");
2587                 return -1;
2588         }
2589
2590         dev = serial->dev;
2591
2592         dbg("%s\n", "Entering...");
2593
2594         /* we set up the pointers to the endpoints in the mos7840_open *
2595          * function, as the structures aren't created yet.             */
2596
2597         /* set up port private structures */
2598         for (i = 0; i < serial->num_ports; ++i) {
2599                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2600                 if (mos7840_port == NULL) {
2601                         err("%s - Out of memory", __FUNCTION__);
2602                         return -ENOMEM;
2603                 }
2604
2605                 /* Initialize all port interrupt end point to port 0 int endpoint *
2606                  * Our device has only one interrupt end point comman to all port */
2607
2608                 mos7840_port->port = serial->port[i];
2609                 mos7840_set_port_private(serial->port[i], mos7840_port);
2610
2611                 mos7840_port->port_num = ((serial->port[i]->number -
2612                                            (serial->port[i]->serial->minor)) +
2613                                           1);
2614
2615                 if (mos7840_port->port_num == 1) {
2616                         mos7840_port->SpRegOffset = 0x0;
2617                         mos7840_port->ControlRegOffset = 0x1;
2618                         mos7840_port->DcrRegOffset = 0x4;
2619                 } else if ((mos7840_port->port_num == 2)
2620                            && (mos7840_num_ports == 4)) {
2621                         mos7840_port->SpRegOffset = 0x8;
2622                         mos7840_port->ControlRegOffset = 0x9;
2623                         mos7840_port->DcrRegOffset = 0x16;
2624                 } else if ((mos7840_port->port_num == 2)
2625                            && (mos7840_num_ports == 2)) {
2626                         mos7840_port->SpRegOffset = 0xa;
2627                         mos7840_port->ControlRegOffset = 0xb;
2628                         mos7840_port->DcrRegOffset = 0x19;
2629                 } else if ((mos7840_port->port_num == 3)
2630                            && (mos7840_num_ports == 4)) {
2631                         mos7840_port->SpRegOffset = 0xa;
2632                         mos7840_port->ControlRegOffset = 0xb;
2633                         mos7840_port->DcrRegOffset = 0x19;
2634                 } else if ((mos7840_port->port_num == 4)
2635                            && (mos7840_num_ports == 4)) {
2636                         mos7840_port->SpRegOffset = 0xc;
2637                         mos7840_port->ControlRegOffset = 0xd;
2638                         mos7840_port->DcrRegOffset = 0x1c;
2639                 }
2640                 mos7840_dump_serial_port(mos7840_port);
2641
2642                 mos7840_set_port_private(serial->port[i], mos7840_port);
2643
2644                 //enable rx_disable bit in control register
2645
2646                 status =
2647                     mos7840_get_reg_sync(serial->port[i],
2648                                          mos7840_port->ControlRegOffset, &Data);
2649                 if (status < 0) {
2650                         dbg("Reading ControlReg failed status-0x%x\n", status);
2651                         break;
2652                 } else
2653                         dbg("ControlReg Reading success val is %x, status%d\n",
2654                             Data, status);
2655                 Data |= 0x08;   //setting driver done bit
2656                 Data |= 0x04;   //sp1_bit to have cts change reflect in modem status reg
2657
2658                 //Data |= 0x20; //rx_disable bit
2659                 status = 0;
2660                 status =
2661                     mos7840_set_reg_sync(serial->port[i],
2662                                          mos7840_port->ControlRegOffset, Data);
2663                 if (status < 0) {
2664                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2665                         break;
2666                 } else
2667                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2668                             status);
2669
2670                 //Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 and 0x24 in DCR3
2671                 Data = 0x01;
2672                 status = 0;
2673                 status =
2674                     mos7840_set_reg_sync(serial->port[i],
2675                                          (__u16) (mos7840_port->DcrRegOffset +
2676                                                   0), Data);
2677                 if (status < 0) {
2678                         dbg("Writing DCR0 failed status-0x%x\n", status);
2679                         break;
2680                 } else
2681                         dbg("DCR0 Writing success status%d\n", status);
2682
2683                 Data = 0x05;
2684                 status = 0;
2685                 status =
2686                     mos7840_set_reg_sync(serial->port[i],
2687                                          (__u16) (mos7840_port->DcrRegOffset +
2688                                                   1), Data);
2689                 if (status < 0) {
2690                         dbg("Writing DCR1 failed status-0x%x\n", status);
2691                         break;
2692                 } else
2693                         dbg("DCR1 Writing success status%d\n", status);
2694
2695                 Data = 0x24;
2696                 status = 0;
2697                 status =
2698                     mos7840_set_reg_sync(serial->port[i],
2699                                          (__u16) (mos7840_port->DcrRegOffset +
2700                                                   2), Data);
2701                 if (status < 0) {
2702                         dbg("Writing DCR2 failed status-0x%x\n", status);
2703                         break;
2704                 } else
2705                         dbg("DCR2 Writing success status%d\n", status);
2706
2707                 // write values in clkstart0x0 and clkmulti 0x20
2708                 Data = 0x0;
2709                 status = 0;
2710                 status =
2711                     mos7840_set_reg_sync(serial->port[i],
2712                                          CLK_START_VALUE_REGISTER, Data);
2713                 if (status < 0) {
2714                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2715                         break;
2716                 } else
2717                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2718
2719                 Data = 0x20;
2720                 status = 0;
2721                 status =
2722                     mos7840_set_reg_sync(serial->port[i], CLK_MULTI_REGISTER,
2723                                          Data);
2724                 if (status < 0) {
2725                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2726                             status);
2727                         break;
2728                 } else
2729                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2730                             status);
2731
2732                 //write value 0x0 to scratchpad register
2733                 Data = 0x00;
2734                 status = 0;
2735                 status =
2736                     mos7840_set_uart_reg(serial->port[i], SCRATCH_PAD_REGISTER,
2737                                          Data);
2738                 if (status < 0) {
2739                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2740                             status);
2741                         break;
2742                 } else
2743                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2744                             status);
2745
2746                 //Zero Length flag register
2747                 if ((mos7840_port->port_num != 1)
2748                     && (mos7840_num_ports == 2)) {
2749
2750                         Data = 0xff;
2751                         status = 0;
2752                         status = mos7840_set_reg_sync(serial->port[i],
2753                                                       (__u16) (ZLP_REG1 +
2754                                                                ((__u16)
2755                                                                 mos7840_port->
2756                                                                 port_num)),
2757                                                       Data);
2758                         dbg("ZLIP offset%x\n",
2759                             (__u16) (ZLP_REG1 +
2760                                      ((__u16) mos7840_port->port_num)));
2761                         if (status < 0) {
2762                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2763                                     i + 2, status);
2764                                 break;
2765                         } else
2766                                 dbg("ZLP_REG%d Writing success status%d\n",
2767                                     i + 2, status);
2768                 } else {
2769                         Data = 0xff;
2770                         status = 0;
2771                         status = mos7840_set_reg_sync(serial->port[i],
2772                                                       (__u16) (ZLP_REG1 +
2773                                                                ((__u16)
2774                                                                 mos7840_port->
2775                                                                 port_num) -
2776                                                                0x1), Data);
2777                         dbg("ZLIP offset%x\n",
2778                             (__u16) (ZLP_REG1 +
2779                                      ((__u16) mos7840_port->port_num) - 0x1));
2780                         if (status < 0) {
2781                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2782                                     i + 1, status);
2783                                 break;
2784                         } else
2785                                 dbg("ZLP_REG%d Writing success status%d\n",
2786                                     i + 1, status);
2787
2788                 }
2789                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_ATOMIC);
2790                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2791
2792         }
2793
2794         //Zero Length flag enable
2795         Data = 0x0f;
2796         status = 0;
2797         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2798         if (status < 0) {
2799                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2800                 return -1;
2801         } else
2802                 dbg("ZLP_REG5 Writing success status%d\n", status);
2803
2804         /* setting configuration feature to one */
2805         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2806                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2807         return 0;
2808 }
2809
2810 /****************************************************************************
2811  * mos7840_shutdown
2812  *      This function is called whenever the device is removed from the usb bus.
2813  ****************************************************************************/
2814
2815 static void mos7840_shutdown(struct usb_serial *serial)
2816 {
2817         int i;
2818         struct moschip_port *mos7840_port;
2819         dbg("%s \n", " shutdown :entering..........");
2820
2821         if (!serial) {
2822                 dbg("%s", "Invalid Handler \n");
2823                 return;
2824         }
2825
2826         /*      check for the ports to be closed,close the ports and disconnect         */
2827
2828         /* free private structure allocated for serial port  *
2829          * stop reads and writes on all ports                */
2830
2831         for (i = 0; i < serial->num_ports; ++i) {
2832                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2833                 kfree(mos7840_port->ctrl_buf);
2834                 usb_kill_urb(mos7840_port->control_urb);
2835                 kfree(mos7840_port);
2836                 mos7840_set_port_private(serial->port[i], NULL);
2837         }
2838
2839         dbg("%s\n", "Thank u :: ");
2840
2841 }
2842
2843 static struct usb_serial_driver moschip7840_4port_device = {
2844         .driver = {
2845                    .owner = THIS_MODULE,
2846                    .name = "mos7840",
2847                    },
2848         .description = DRIVER_DESC,
2849         .id_table = moschip_port_id_table,
2850         .num_interrupt_in = 1,  //NUM_DONT_CARE,//1,
2851 #ifdef check
2852         .num_bulk_in = 4,
2853         .num_bulk_out = 4,
2854         .num_ports = 4,
2855 #endif
2856         .open = mos7840_open,
2857         .close = mos7840_close,
2858         .write = mos7840_write,
2859         .write_room = mos7840_write_room,
2860         .chars_in_buffer = mos7840_chars_in_buffer,
2861         .throttle = mos7840_throttle,
2862         .unthrottle = mos7840_unthrottle,
2863         .calc_num_ports = mos7840_calc_num_ports,
2864 #ifdef MCSSerialProbe
2865         .probe = mos7840_serial_probe,
2866 #endif
2867         .ioctl = mos7840_ioctl,
2868         .set_termios = mos7840_set_termios,
2869         .break_ctl = mos7840_break,
2870         .tiocmget = mos7840_tiocmget,
2871         .tiocmset = mos7840_tiocmset,
2872         .attach = mos7840_startup,
2873         .shutdown = mos7840_shutdown,
2874         .read_bulk_callback = mos7840_bulk_in_callback,
2875         .read_int_callback = mos7840_interrupt_callback,
2876 };
2877
2878 static struct usb_driver io_driver = {
2879         .name = "mos7840",
2880         .probe = usb_serial_probe,
2881         .disconnect = usb_serial_disconnect,
2882         .id_table = moschip_id_table_combined,
2883 };
2884
2885 /****************************************************************************
2886  * moschip7840_init
2887  *      This is called by the module subsystem, or on startup to initialize us
2888  ****************************************************************************/
2889 static int __init moschip7840_init(void)
2890 {
2891         int retval;
2892
2893         dbg("%s \n", " mos7840_init :entering..........");
2894
2895         /* Register with the usb serial */
2896         retval = usb_serial_register(&moschip7840_4port_device);
2897
2898         if (retval)
2899                 goto failed_port_device_register;
2900
2901         dbg("%s\n", "Entring...");
2902         info(DRIVER_DESC " " DRIVER_VERSION);
2903
2904         /* Register with the usb */
2905         retval = usb_register(&io_driver);
2906
2907         if (retval)
2908                 goto failed_usb_register;
2909
2910         if (retval == 0) {
2911                 dbg("%s\n", "Leaving...");
2912                 return 0;
2913         }
2914
2915       failed_usb_register:
2916         usb_serial_deregister(&moschip7840_4port_device);
2917
2918       failed_port_device_register:
2919
2920         return retval;
2921 }
2922
2923 /****************************************************************************
2924  * moschip7840_exit
2925  *      Called when the driver is about to be unloaded.
2926  ****************************************************************************/
2927 static void __exit moschip7840_exit(void)
2928 {
2929
2930         dbg("%s \n", " mos7840_exit :entering..........");
2931
2932         usb_deregister(&io_driver);
2933
2934         usb_serial_deregister(&moschip7840_4port_device);
2935
2936         dbg("%s\n", "Entring...");
2937 }
2938
2939 module_init(moschip7840_init);
2940 module_exit(moschip7840_exit);
2941
2942 /* Module information */
2943 MODULE_DESCRIPTION(DRIVER_DESC);
2944 MODULE_LICENSE("GPL");
2945
2946 module_param(debug, bool, S_IRUGO | S_IWUSR);
2947 MODULE_PARM_DESC(debug, "Debug enabled or not");