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 /* The native mos7840/7820 component */
 114 #define USB_VENDOR_ID_MOSCHIP           0x9710
 115 #define MOSCHIP_DEVICE_ID_7840          0x7840
 116 #define MOSCHIP_DEVICE_ID_7820          0x7820
 117 /* The native component can have its vendor/device id's overridden
 118  * in vendor-specific implementations.  Such devices can be handled
 119  * by making a change here, in moschip_port_id_table, and in
 120  * moschip_id_table_combined
 121  */
 122 #define USB_VENDOR_ID_BANDB             0x0856
 123 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 124 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 125
 126 /* Interrupt Routine Defines    */
 127
 128 #define SERIAL_IIR_RLS      0x06
 129 #define SERIAL_IIR_MS       0x00
 130
 131 /*
 132  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 133  */
 134 #define SERIAL_LSR_DR       0x0001
 135 #define SERIAL_LSR_OE       0x0002
 136 #define SERIAL_LSR_PE       0x0004
 137 #define SERIAL_LSR_FE       0x0008
 138 #define SERIAL_LSR_BI       0x0010
 139
 140 #define MOS_MSR_DELTA_CTS   0x10
 141 #define MOS_MSR_DELTA_DSR   0x20
 142 #define MOS_MSR_DELTA_RI    0x40
 143 #define MOS_MSR_DELTA_CD    0x80
 144
 145 // Serial Port register Address
 146 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 147 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 148 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 149 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 150 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 151 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 152 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 153 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 154 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 155
 156 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 157 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 158
 159 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 160
 161 /*
 162  * URB POOL related defines
 163  */
 164 #define NUM_URBS                        16      /* URB Count */
 165 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 166
 167
 168 static struct usb_device_id moschip_port_id_table[] = {
 169         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 170         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 171         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 172         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 173         {}                      /* terminating entry */
 174 };
 175
 176 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 177         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 178         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 179         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 180         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 181         {}                      /* terminating entry */
 182 };
 183
 184 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 185
 186 /* This structure holds all of the local port information */
 187
 188 struct moschip_port {
 189         int port_num;           /*Actual port number in the device(1,2,etc) */
 190         struct urb *write_urb;  /* write URB for this port */
 191         struct urb *read_urb;   /* read URB for this port */
 192         struct urb *int_urb;
 193         __u8 shadowLCR;         /* last LCR value received */
 194         __u8 shadowMCR;         /* last MCR value received */
 195         char open;
 196         char open_ports;
 197         char zombie;
 198         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 199         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 200         int delta_msr_cond;
 201         struct async_icount icount;
 202         struct usb_serial_port *port;   /* loop back to the owner of this object */
 203
 204         /*Offsets */
 205         __u8 SpRegOffset;
 206         __u8 ControlRegOffset;
 207         __u8 DcrRegOffset;
 208         //for processing control URBS in interrupt context
 209         struct urb *control_urb;
 210         struct usb_ctrlrequest *dr;
 211         char *ctrl_buf;
 212         int MsrLsr;
 213
 214         spinlock_t pool_lock;
 215         struct urb *write_urb_pool[NUM_URBS];
 216         char busy[NUM_URBS];
 217 };
 218
 219
 220 static int debug;
 221
 222 /*
 223  * mos7840_set_reg_sync
 224  *      To set the Control register by calling usb_fill_control_urb function
 225  *      by passing usb_sndctrlpipe function as parameter.
 226  */
 227
 228 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 229                                 __u16 val)
 230 {
 231         struct usb_device *dev = port->serial->dev;
 232         val = val & 0x00ff;
 233         dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 234
 235         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 236                                MCS_WR_RTYPE, val, reg, NULL, 0,
 237                                MOS_WDR_TIMEOUT);
 238 }
 239
 240 /*
 241  * mos7840_get_reg_sync
 242  *      To set the Uart register by calling usb_fill_control_urb function by
 243  *      passing usb_rcvctrlpipe function as parameter.
 244  */
 245
 246 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 247                                 __u16 * val)
 248 {
 249         struct usb_device *dev = port->serial->dev;
 250         int ret = 0;
 251
 252         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 253                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 254                               MOS_WDR_TIMEOUT);
 255         dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
 256         *val = (*val) & 0x00ff;
 257         return ret;
 258 }
 259
 260 /*
 261  * mos7840_set_uart_reg
 262  *      To set the Uart register by calling usb_fill_control_urb function by
 263  *      passing usb_sndctrlpipe function as parameter.
 264  */
 265
 266 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 267                                 __u16 val)
 268 {
 269
 270         struct usb_device *dev = port->serial->dev;
 271         val = val & 0x00ff;
 272         // For the UART control registers, the application number need to be Or'ed
 273         if (port->serial->num_ports == 4) {
 274                 val |=
 275                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 276                      1) << 8;
 277                 dbg("mos7840_set_uart_reg application number is %x\n", val);
 278         } else {
 279                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 280                         val |=
 281                             (((__u16) port->number -
 282                               (__u16) (port->serial->minor)) + 1) << 8;
 283                         dbg("mos7840_set_uart_reg application number is %x\n",
 284                             val);
 285                 } else {
 286                         val |=
 287                             (((__u16) port->number -
 288                               (__u16) (port->serial->minor)) + 2) << 8;
 289                         dbg("mos7840_set_uart_reg application number is %x\n",
 290                             val);
 291                 }
 292         }
 293         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 294                                MCS_WR_RTYPE, val, reg, NULL, 0,
 295                                MOS_WDR_TIMEOUT);
 296
 297 }
 298
 299 /*
 300  * mos7840_get_uart_reg
 301  *      To set the Control register by calling usb_fill_control_urb function
 302  *      by passing usb_rcvctrlpipe function as parameter.
 303  */
 304 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 305                                 __u16 * val)
 306 {
 307         struct usb_device *dev = port->serial->dev;
 308         int ret = 0;
 309         __u16 Wval;
 310
 311         //dbg("application number is %4x \n",(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8);
 312         /*Wval  is same as application number */
 313         if (port->serial->num_ports == 4) {
 314                 Wval =
 315                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 316                      1) << 8;
 317                 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
 318         } else {
 319                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 320                         Wval =
 321                             (((__u16) port->number -
 322                               (__u16) (port->serial->minor)) + 1) << 8;
 323                         dbg("mos7840_get_uart_reg application number is %x\n",
 324                             Wval);
 325                 } else {
 326                         Wval =
 327                             (((__u16) port->number -
 328                               (__u16) (port->serial->minor)) + 2) << 8;
 329                         dbg("mos7840_get_uart_reg application number is %x\n",
 330                             Wval);
 331                 }
 332         }
 333         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 334                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 335                               MOS_WDR_TIMEOUT);
 336         *val = (*val) & 0x00ff;
 337         return ret;
 338 }
 339
 340 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 341 {
 342
 343         dbg("***************************************\n");
 344         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 345         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 346         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 347         dbg("***************************************\n");
 348
 349 }
 350
 351 /************************************************************************/
 352 /************************************************************************/
 353 /*             I N T E R F A C E   F U N C T I O N S                    */
 354 /*             I N T E R F A C E   F U N C T I O N S                    */
 355 /************************************************************************/
 356 /************************************************************************/
 357
 358 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 359                                             struct moschip_port *data)
 360 {
 361         usb_set_serial_port_data(port, (void *)data);
 362 }
 363
 364 static inline struct moschip_port *mos7840_get_port_private(struct
 365                                                             usb_serial_port
 366                                                             *port)
 367 {
 368         return (struct moschip_port *)usb_get_serial_port_data(port);
 369 }
 370
 371 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 372 {
 373         struct moschip_port *mos7840_port;
 374         struct async_icount *icount;
 375         mos7840_port = port;
 376         icount = &mos7840_port->icount;
 377         if (new_msr &
 378             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 379              MOS_MSR_DELTA_CD)) {
 380                 icount = &mos7840_port->icount;
 381
 382                 /* update input line counters */
 383                 if (new_msr & MOS_MSR_DELTA_CTS) {
 384                         icount->cts++;
 385                         smp_wmb();
 386                 }
 387                 if (new_msr & MOS_MSR_DELTA_DSR) {
 388                         icount->dsr++;
 389                         smp_wmb();
 390                 }
 391                 if (new_msr & MOS_MSR_DELTA_CD) {
 392                         icount->dcd++;
 393                         smp_wmb();
 394                 }
 395                 if (new_msr & MOS_MSR_DELTA_RI) {
 396                         icount->rng++;
 397                         smp_wmb();
 398                 }
 399         }
 400 }
 401
 402 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 403 {
 404         struct async_icount *icount;
 405
 406         dbg("%s - %02x", __func__, new_lsr);
 407
 408         if (new_lsr & SERIAL_LSR_BI) {
 409                 //
 410                 // Parity and Framing errors only count if they
 411                 // occur exclusive of a break being
 412                 // received.
 413                 //
 414                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 415         }
 416
 417         /* update input line counters */
 418         icount = &port->icount;
 419         if (new_lsr & SERIAL_LSR_BI) {
 420                 icount->brk++;
 421                 smp_wmb();
 422         }
 423         if (new_lsr & SERIAL_LSR_OE) {
 424                 icount->overrun++;
 425                 smp_wmb();
 426         }
 427         if (new_lsr & SERIAL_LSR_PE) {
 428                 icount->parity++;
 429                 smp_wmb();
 430         }
 431         if (new_lsr & SERIAL_LSR_FE) {
 432                 icount->frame++;
 433                 smp_wmb();
 434         }
 435 }
 436
 437 /************************************************************************/
 438 /************************************************************************/
 439 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 440 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 441 /************************************************************************/
 442 /************************************************************************/
 443
 444 static void mos7840_control_callback(struct urb *urb)
 445 {
 446         unsigned char *data;
 447         struct moschip_port *mos7840_port;
 448         __u8 regval = 0x0;
 449         int result = 0;
 450         int status = urb->status;
 451
 452         mos7840_port = urb->context;
 453
 454         switch (status) {
 455         case 0:
 456                 /* success */
 457                 break;
 458         case -ECONNRESET:
 459         case -ENOENT:
 460         case -ESHUTDOWN:
 461                 /* this urb is terminated, clean up */
 462                 dbg("%s - urb shutting down with status: %d", __func__,
 463                     status);
 464                 return;
 465         default:
 466                 dbg("%s - nonzero urb status received: %d", __func__,
 467                     status);
 468                 goto exit;
 469         }
 470
 471         dbg("%s urb buffer size is %d\n", __func__, urb->actual_length);
 472         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 473             mos7840_port->MsrLsr, mos7840_port->port_num);
 474         data = urb->transfer_buffer;
 475         regval = (__u8) data[0];
 476         dbg("%s data is %x\n", __func__, regval);
 477         if (mos7840_port->MsrLsr == 0)
 478                 mos7840_handle_new_msr(mos7840_port, regval);
 479         else if (mos7840_port->MsrLsr == 1)
 480                 mos7840_handle_new_lsr(mos7840_port, regval);
 481
 482 exit:
 483         spin_lock(&mos7840_port->pool_lock);
 484         if (!mos7840_port->zombie)
 485                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 486         spin_unlock(&mos7840_port->pool_lock);
 487         if (result) {
 488                 dev_err(&urb->dev->dev,
 489                         "%s - Error %d submitting interrupt urb\n",
 490                         __func__, result);
 491         }
 492 }
 493
 494 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 495                            __u16 * val)
 496 {
 497         struct usb_device *dev = mcs->port->serial->dev;
 498         struct usb_ctrlrequest *dr = mcs->dr;
 499         unsigned char *buffer = mcs->ctrl_buf;
 500         int ret;
 501
 502         dr->bRequestType = MCS_RD_RTYPE;
 503         dr->bRequest = MCS_RDREQ;
 504         dr->wValue = cpu_to_le16(Wval); //0;
 505         dr->wIndex = cpu_to_le16(reg);
 506         dr->wLength = cpu_to_le16(2);
 507
 508         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 509                              (unsigned char *)dr, buffer, 2,
 510                              mos7840_control_callback, mcs);
 511         mcs->control_urb->transfer_buffer_length = 2;
 512         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 513         return ret;
 514 }
 515
 516 /*****************************************************************************
 517  * mos7840_interrupt_callback
 518  *      this is the callback function for when we have received data on the
 519  *      interrupt endpoint.
 520  *****************************************************************************/
 521
 522 static void mos7840_interrupt_callback(struct urb *urb)
 523 {
 524         int result;
 525         int length;
 526         struct moschip_port *mos7840_port;
 527         struct usb_serial *serial;
 528         __u16 Data;
 529         unsigned char *data;
 530         __u8 sp[5], st;
 531         int i, rv = 0;
 532         __u16 wval, wreg = 0;
 533         int status = urb->status;
 534
 535         dbg("%s", " : Entering\n");
 536
 537         switch (status) {
 538         case 0:
 539                 /* success */
 540                 break;
 541         case -ECONNRESET:
 542         case -ENOENT:
 543         case -ESHUTDOWN:
 544                 /* this urb is terminated, clean up */
 545                 dbg("%s - urb shutting down with status: %d", __func__,
 546                     status);
 547                 return;
 548         default:
 549                 dbg("%s - nonzero urb status received: %d", __func__,
 550                     status);
 551                 goto exit;
 552         }
 553
 554         length = urb->actual_length;
 555         data = urb->transfer_buffer;
 556
 557         serial = urb->context;
 558
 559         /* Moschip get 5 bytes
 560          * Byte 1 IIR Port 1 (port.number is 0)
 561          * Byte 2 IIR Port 2 (port.number is 1)
 562          * Byte 3 IIR Port 3 (port.number is 2)
 563          * Byte 4 IIR Port 4 (port.number is 3)
 564          * Byte 5 FIFO status for both */
 565
 566         if (length && length > 5) {
 567                 dbg("%s \n", "Wrong data !!!");
 568                 return;
 569         }
 570
 571         sp[0] = (__u8) data[0];
 572         sp[1] = (__u8) data[1];
 573         sp[2] = (__u8) data[2];
 574         sp[3] = (__u8) data[3];
 575         st = (__u8) data[4];
 576
 577         for (i = 0; i < serial->num_ports; i++) {
 578                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 579                 wval =
 580                     (((__u16) serial->port[i]->number -
 581                       (__u16) (serial->minor)) + 1) << 8;
 582                 if (mos7840_port->open) {
 583                         if (sp[i] & 0x01) {
 584                                 dbg("SP%d No Interrupt !!!\n", i);
 585                         } else {
 586                                 switch (sp[i] & 0x0f) {
 587                                 case SERIAL_IIR_RLS:
 588                                         dbg("Serial Port %d: Receiver status error or ", i);
 589                                         dbg("address bit detected in 9-bit mode\n");
 590                                         mos7840_port->MsrLsr = 1;
 591                                         wreg = LINE_STATUS_REGISTER;
 592                                         break;
 593                                 case SERIAL_IIR_MS:
 594                                         dbg("Serial Port %d: Modem status change\n", i);
 595                                         mos7840_port->MsrLsr = 0;
 596                                         wreg = MODEM_STATUS_REGISTER;
 597                                         break;
 598                                 }
 599                                 spin_lock(&mos7840_port->pool_lock);
 600                                 if (!mos7840_port->zombie) {
 601                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 602                                 } else {
 603                                         spin_unlock(&mos7840_port->pool_lock);
 604                                         return;
 605                                 }
 606                                 spin_unlock(&mos7840_port->pool_lock);
 607                         }
 608                 }
 609         }
 610         if (!(rv < 0)) /* the completion handler for the control urb will resubmit */
 611                 return;
 612 exit:
 613         result = usb_submit_urb(urb, GFP_ATOMIC);
 614         if (result) {
 615                 dev_err(&urb->dev->dev,
 616                         "%s - Error %d submitting interrupt urb\n",
 617                         __func__, result);
 618         }
 619 }
 620
 621 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 622                                        const char *function)
 623 {
 624         if (!port) {
 625                 dbg("%s - port == NULL", function);
 626                 return -1;
 627         }
 628         if (!port->serial) {
 629                 dbg("%s - port->serial == NULL", function);
 630                 return -1;
 631         }
 632
 633         return 0;
 634 }
 635
 636 /* Inline functions to check the sanity of a pointer that is passed to us */
 637 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 638                                          const char *function)
 639 {
 640         if (!serial) {
 641                 dbg("%s - serial == NULL", function);
 642                 return -1;
 643         }
 644         if (!serial->type) {
 645                 dbg("%s - serial->type == NULL!", function);
 646                 return -1;
 647         }
 648
 649         return 0;
 650 }
 651
 652 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 653                                                  const char *function)
 654 {
 655         /* if no port was specified, or it fails a paranoia check */
 656         if (!port ||
 657             mos7840_port_paranoia_check(port, function) ||
 658             mos7840_serial_paranoia_check(port->serial, function)) {
 659                 /* then say that we don't have a valid usb_serial thing, which will
 660                  * end up genrating -ENODEV return values */
 661                 return NULL;
 662         }
 663
 664         return port->serial;
 665 }
 666
 667 /*****************************************************************************
 668  * mos7840_bulk_in_callback
 669  *      this is the callback function for when we have received data on the
 670  *      bulk in endpoint.
 671  *****************************************************************************/
 672
 673 static void mos7840_bulk_in_callback(struct urb *urb)
 674 {
 675         int retval;
 676         unsigned char *data;
 677         struct usb_serial *serial;
 678         struct usb_serial_port *port;
 679         struct moschip_port *mos7840_port;
 680         struct tty_struct *tty;
 681         int status = urb->status;
 682
 683         if (status) {
 684                 dbg("nonzero read bulk status received: %d", status);
 685                 return;
 686         }
 687
 688         mos7840_port = urb->context;
 689         if (!mos7840_port) {
 690                 dbg("%s", "NULL mos7840_port pointer \n");
 691                 return;
 692         }
 693
 694         port = (struct usb_serial_port *)mos7840_port->port;
 695         if (mos7840_port_paranoia_check(port, __func__)) {
 696                 dbg("%s", "Port Paranoia failed \n");
 697                 return;
 698         }
 699
 700         serial = mos7840_get_usb_serial(port, __func__);
 701         if (!serial) {
 702                 dbg("%s\n", "Bad serial pointer ");
 703                 return;
 704         }
 705
 706         dbg("%s\n", "Entering... \n");
 707
 708         data = urb->transfer_buffer;
 709
 710         dbg("%s", "Entering ........... \n");
 711
 712         if (urb->actual_length) {
 713                 tty = mos7840_port->port->tty;
 714                 if (tty) {
 715                         tty_buffer_request_room(tty, urb->actual_length);
 716                         tty_insert_flip_string(tty, data, urb->actual_length);
 717                         dbg(" %s \n", data);
 718                         tty_flip_buffer_push(tty);
 719                 }
 720                 mos7840_port->icount.rx += urb->actual_length;
 721                 smp_wmb();
 722                 dbg("mos7840_port->icount.rx is %d:\n",
 723                     mos7840_port->icount.rx);
 724         }
 725
 726         if (!mos7840_port->read_urb) {
 727                 dbg("%s", "URB KILLED !!!\n");
 728                 return;
 729         }
 730
 731
 732         mos7840_port->read_urb->dev = serial->dev;
 733
 734         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 735
 736         if (retval) {
 737                 dbg(" usb_submit_urb(read bulk) failed, retval = %d",
 738                  retval);
 739         }
 740 }
 741
 742 /*****************************************************************************
 743  * mos7840_bulk_out_data_callback
 744  *      this is the callback function for when we have finished sending serial data
 745  *      on the bulk out endpoint.
 746  *****************************************************************************/
 747
 748 static void mos7840_bulk_out_data_callback(struct urb *urb)
 749 {
 750         struct moschip_port *mos7840_port;
 751         struct tty_struct *tty;
 752         int status = urb->status;
 753         int i;
 754
 755         mos7840_port = urb->context;
 756         spin_lock(&mos7840_port->pool_lock);
 757         for (i = 0; i < NUM_URBS; i++) {
 758                 if (urb == mos7840_port->write_urb_pool[i]) {
 759                         mos7840_port->busy[i] = 0;
 760                         break;
 761                 }
 762         }
 763         spin_unlock(&mos7840_port->pool_lock);
 764
 765         if (status) {
 766                 dbg("nonzero write bulk status received:%d\n", status);
 767                 return;
 768         }
 769
 770         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 771                 dbg("%s", "Port Paranoia failed \n");
 772                 return;
 773         }
 774
 775         dbg("%s \n", "Entering .........");
 776
 777         tty = mos7840_port->port->tty;
 778
 779         if (tty && mos7840_port->open)
 780                 tty_wakeup(tty);
 781
 782 }
 783
 784 /************************************************************************/
 785 /*       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       */
 786 /************************************************************************/
 787 #ifdef MCSSerialProbe
 788 static int mos7840_serial_probe(struct usb_serial *serial,
 789                                 const struct usb_device_id *id)
 790 {
 791
 792         /*need to implement the mode_reg reading and updating\
 793            structures usb_serial_ device_type\
 794            (i.e num_ports, num_bulkin,bulkout etc) */
 795         /* Also we can update the changes  attach */
 796         return 1;
 797 }
 798 #endif
 799
 800 /*****************************************************************************
 801  * mos7840_open
 802  *      this function is called by the tty driver when a port is opened
 803  *      If successful, we return 0
 804  *      Otherwise we return a negative error number.
 805  *****************************************************************************/
 806
 807 static int mos7840_open(struct usb_serial_port *port, struct file *filp)
 808 {
 809         int response;
 810         int j;
 811         struct usb_serial *serial;
 812         struct urb *urb;
 813         __u16 Data;
 814         int status;
 815         struct moschip_port *mos7840_port;
 816         struct moschip_port *port0;
 817
 818         if (mos7840_port_paranoia_check(port, __func__)) {
 819                 dbg("%s", "Port Paranoia failed \n");
 820                 return -ENODEV;
 821         }
 822
 823         serial = port->serial;
 824
 825         if (mos7840_serial_paranoia_check(serial, __func__)) {
 826                 dbg("%s", "Serial Paranoia failed \n");
 827                 return -ENODEV;
 828         }
 829
 830         mos7840_port = mos7840_get_port_private(port);
 831         port0 = mos7840_get_port_private(serial->port[0]);
 832
 833         if (mos7840_port == NULL || port0 == NULL)
 834                 return -ENODEV;
 835
 836         usb_clear_halt(serial->dev, port->write_urb->pipe);
 837         usb_clear_halt(serial->dev, port->read_urb->pipe);
 838         port0->open_ports++;
 839
 840         /* Initialising the write urb pool */
 841         for (j = 0; j < NUM_URBS; ++j) {
 842                 urb = usb_alloc_urb(0, GFP_KERNEL);
 843                 mos7840_port->write_urb_pool[j] = urb;
 844
 845                 if (urb == NULL) {
 846                         err("No more urbs???");
 847                         continue;
 848                 }
 849
 850                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
 851                 if (!urb->transfer_buffer) {
 852                         usb_free_urb(urb);
 853                         mos7840_port->write_urb_pool[j] = NULL;
 854                         err("%s-out of memory for urb buffers.", __func__);
 855                         continue;
 856                 }
 857         }
 858
 859 /*****************************************************************************
 860  * Initialize MCS7840 -- Write Init values to corresponding Registers
 861  *
 862  * Register Index
 863  * 1 : IER
 864  * 2 : FCR
 865  * 3 : LCR
 866  * 4 : MCR
 867  *
 868  * 0x08 : SP1/2 Control Reg
 869  *****************************************************************************/
 870
 871 //NEED to check the following Block
 872
 873         status = 0;
 874         Data = 0x0;
 875         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 876         if (status < 0) {
 877                 dbg("Reading Spreg failed\n");
 878                 return -1;
 879         }
 880         Data |= 0x80;
 881         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 882         if (status < 0) {
 883                 dbg("writing Spreg failed\n");
 884                 return -1;
 885         }
 886
 887         Data &= ~0x80;
 888         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 889         if (status < 0) {
 890                 dbg("writing Spreg failed\n");
 891                 return -1;
 892         }
 893 //End of block to be checked
 894
 895         status = 0;
 896         Data = 0x0;
 897         status =
 898             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 899         if (status < 0) {
 900                 dbg("Reading Controlreg failed\n");
 901                 return -1;
 902         }
 903         Data |= 0x08;           //Driver done bit
 904         Data |= 0x20;           //rx_disable
 905         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 906         if (status < 0) {
 907                 dbg("writing Controlreg failed\n");
 908                 return -1;
 909         }
 910         //do register settings here
 911         // Set all regs to the device default values.
 912         ////////////////////////////////////
 913         // First Disable all interrupts.
 914         ////////////////////////////////////
 915
 916         Data = 0x00;
 917         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 918         if (status < 0) {
 919                 dbg("disableing interrupts failed\n");
 920                 return -1;
 921         }
 922         // Set FIFO_CONTROL_REGISTER to the default value
 923         Data = 0x00;
 924         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 925         if (status < 0) {
 926                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 927                 return -1;
 928         }
 929
 930         Data = 0xcf;
 931         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 932         if (status < 0) {
 933                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 934                 return -1;
 935         }
 936
 937         Data = 0x03;
 938         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 939         mos7840_port->shadowLCR = Data;
 940
 941         Data = 0x0b;
 942         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 943         mos7840_port->shadowMCR = Data;
 944
 945         Data = 0x00;
 946         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 947         mos7840_port->shadowLCR = Data;
 948
 949         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
 950         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 951
 952         Data = 0x0c;
 953         status = 0;
 954         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 955
 956         Data = 0x0;
 957         status = 0;
 958         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 959
 960         Data = 0x00;
 961         status = 0;
 962         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 963
 964         Data = Data & ~SERIAL_LCR_DLAB;
 965         status = 0;
 966         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 967         mos7840_port->shadowLCR = Data;
 968
 969         //clearing Bulkin and Bulkout Fifo
 970         Data = 0x0;
 971         status = 0;
 972         status = mos7840_get_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
 978         Data = Data & ~0x0c;
 979         status = 0;
 980         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 981         //Finally enable all interrupts
 982         Data = 0x0;
 983         Data = 0x0c;
 984         status = 0;
 985         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 986
 987         //clearing rx_disable
 988         Data = 0x0;
 989         status = 0;
 990         status =
 991             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 992         Data = Data & ~0x20;
 993         status = 0;
 994         status =
 995             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 996
 997         // rx_negate
 998         Data = 0x0;
 999         status = 0;
1000         status =
1001             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
1002         Data = Data | 0x10;
1003         status = 0;
1004         status =
1005             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
1006
1007         /* force low_latency on so that our tty_push actually forces *
1008          * the data through,otherwise it is scheduled, and with      *
1009          * high data rates (like with OHCI) data can get lost.       */
1010
1011         if (port->tty)
1012                 port->tty->low_latency = 1;
1013 /* Check to see if we've set up our endpoint info yet    *
1014      * (can't set it up in mos7840_startup as the structures *
1015      * were not set up at that time.)                        */
1016         if (port0->open_ports == 1) {
1017                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1018
1019                         /* set up interrupt urb */
1020
1021                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1022                                          serial->dev,
1023                                          usb_rcvintpipe(serial->dev,
1024                                                         serial->port[0]->
1025                                                         interrupt_in_endpointAddress),
1026                                          serial->port[0]->interrupt_in_buffer,
1027                                          serial->port[0]->interrupt_in_urb->
1028                                          transfer_buffer_length,
1029                                          mos7840_interrupt_callback,
1030                                          serial,
1031                                          serial->port[0]->interrupt_in_urb->
1032                                          interval);
1033
1034                         /* start interrupt read for mos7840               *
1035                          * will continue as long as mos7840 is connected  */
1036
1037                         response =
1038                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1039                                            GFP_KERNEL);
1040                         if (response) {
1041                                 err("%s - Error %d submitting interrupt urb",
1042                                     __func__, response);
1043                         }
1044
1045                 }
1046
1047         }
1048
1049         /* see if we've set up our endpoint info yet   *
1050          * (can't set it up in mos7840_startup as the  *
1051          * structures were not set up at that time.)   */
1052
1053         dbg("port number is %d \n", port->number);
1054         dbg("serial number is %d \n", port->serial->minor);
1055         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1056         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1057         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1058         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1059         mos7840_port->read_urb = port->read_urb;
1060
1061         /* set up our bulk in urb */
1062
1063         usb_fill_bulk_urb(mos7840_port->read_urb,
1064                           serial->dev,
1065                           usb_rcvbulkpipe(serial->dev,
1066                                           port->bulk_in_endpointAddress),
1067                           port->bulk_in_buffer,
1068                           mos7840_port->read_urb->transfer_buffer_length,
1069                           mos7840_bulk_in_callback, mos7840_port);
1070
1071         dbg("mos7840_open: bulkin endpoint is %d\n",
1072             port->bulk_in_endpointAddress);
1073         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1074         if (response) {
1075                 err("%s - Error %d submitting control urb", __func__,
1076                     response);
1077         }
1078
1079         /* initialize our wait queues */
1080         init_waitqueue_head(&mos7840_port->wait_chase);
1081         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1082
1083         /* initialize our icount structure */
1084         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1085
1086         /* initialize our port settings */
1087         mos7840_port->shadowMCR = MCR_MASTER_IE;        /* Must set to enable ints! */
1088         /* send a open port command */
1089         mos7840_port->open = 1;
1090         //mos7840_change_port_settings(mos7840_port,old_termios);
1091         mos7840_port->icount.tx = 0;
1092         mos7840_port->icount.rx = 0;
1093
1094         dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n", serial, mos7840_port, port);
1095
1096         return 0;
1097
1098 }
1099
1100 /*****************************************************************************
1101  * mos7840_chars_in_buffer
1102  *      this function is called by the tty driver when it wants to know how many
1103  *      bytes of data we currently have outstanding in the port (data that has
1104  *      been written, but hasn't made it out the port yet)
1105  *      If successful, we return the number of bytes left to be written in the
1106  *      system,
1107  *      Otherwise we return a negative error number.
1108  *****************************************************************************/
1109
1110 static int mos7840_chars_in_buffer(struct usb_serial_port *port)
1111 {
1112         int i;
1113         int chars = 0;
1114         unsigned long flags;
1115         struct moschip_port *mos7840_port;
1116
1117         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1118
1119         if (mos7840_port_paranoia_check(port, __func__)) {
1120                 dbg("%s", "Invalid port \n");
1121                 return -1;
1122         }
1123
1124         mos7840_port = mos7840_get_port_private(port);
1125         if (mos7840_port == NULL) {
1126                 dbg("%s \n", "mos7840_break:leaving ...........");
1127                 return -1;
1128         }
1129
1130         spin_lock_irqsave(&mos7840_port->pool_lock,flags);
1131         for (i = 0; i < NUM_URBS; ++i) {
1132                 if (mos7840_port->busy[i]) {
1133                         chars += URB_TRANSFER_BUFFER_SIZE;
1134                 }
1135         }
1136         spin_unlock_irqrestore(&mos7840_port->pool_lock,flags);
1137         dbg("%s - returns %d", __func__, chars);
1138         return chars;
1139
1140 }
1141
1142 /************************************************************************
1143  *
1144  * mos7840_block_until_tx_empty
1145  *
1146  *      This function will block the close until one of the following:
1147  *              1. TX count are 0
1148  *              2. The mos7840 has stopped
1149  *              3. A timeout of 3 seconds without activity has expired
1150  *
1151  ************************************************************************/
1152 static void mos7840_block_until_tx_empty(struct moschip_port *mos7840_port)
1153 {
1154         int timeout = HZ / 10;
1155         int wait = 30;
1156         int count;
1157
1158         while (1) {
1159
1160                 count = mos7840_chars_in_buffer(mos7840_port->port);
1161
1162                 /* Check for Buffer status */
1163                 if (count <= 0) {
1164                         return;
1165                 }
1166
1167                 /* Block the thread for a while */
1168                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1169                                                timeout);
1170
1171                 /* No activity.. count down section */
1172                 wait--;
1173                 if (wait == 0) {
1174                         dbg("%s - TIMEOUT", __func__);
1175                         return;
1176                 } else {
1177                         /* Reset timeout value back to seconds */
1178                         wait = 30;
1179                 }
1180         }
1181 }
1182
1183 /*****************************************************************************
1184  * mos7840_close
1185  *      this function is called by the tty driver when a port is closed
1186  *****************************************************************************/
1187
1188 static void mos7840_close(struct usb_serial_port *port, struct file *filp)
1189 {
1190         struct usb_serial *serial;
1191         struct moschip_port *mos7840_port;
1192         struct moschip_port *port0;
1193         int j;
1194         __u16 Data;
1195
1196         dbg("%s\n", "mos7840_close:entering...");
1197
1198         if (mos7840_port_paranoia_check(port, __func__)) {
1199                 dbg("%s", "Port Paranoia failed \n");
1200                 return;
1201         }
1202
1203         serial = mos7840_get_usb_serial(port, __func__);
1204         if (!serial) {
1205                 dbg("%s", "Serial Paranoia failed \n");
1206                 return;
1207         }
1208
1209         mos7840_port = mos7840_get_port_private(port);
1210         port0 = mos7840_get_port_private(serial->port[0]);
1211
1212         if (mos7840_port == NULL || port0 == NULL)
1213                 return;
1214
1215         for (j = 0; j < NUM_URBS; ++j)
1216                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1217
1218         /* Freeing Write URBs */
1219         for (j = 0; j < NUM_URBS; ++j) {
1220                 if (mos7840_port->write_urb_pool[j]) {
1221                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1222                                 kfree(mos7840_port->write_urb_pool[j]->
1223                                       transfer_buffer);
1224
1225                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1226                 }
1227         }
1228
1229         if (serial->dev) {
1230                 /* flush and block until tx is empty */
1231                 mos7840_block_until_tx_empty(mos7840_port);
1232         }
1233
1234         /* While closing port, shutdown all bulk read, write  *
1235          * and interrupt read if they exists                  */
1236         if (serial->dev) {
1237
1238                 if (mos7840_port->write_urb) {
1239                         dbg("%s", "Shutdown bulk write\n");
1240                         usb_kill_urb(mos7840_port->write_urb);
1241                 }
1242
1243                 if (mos7840_port->read_urb) {
1244                         dbg("%s", "Shutdown bulk read\n");
1245                         usb_kill_urb(mos7840_port->read_urb);
1246                 }
1247                 if ((&mos7840_port->control_urb)) {
1248                         dbg("%s", "Shutdown control read\n");
1249                         //      usb_kill_urb (mos7840_port->control_urb);
1250
1251                 }
1252         }
1253 //              if(mos7840_port->ctrl_buf != NULL)
1254 //                      kfree(mos7840_port->ctrl_buf);
1255         port0->open_ports--;
1256         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1257             port0->open_ports, port->number);
1258         if (port0->open_ports == 0) {
1259                 if (serial->port[0]->interrupt_in_urb) {
1260                         dbg("%s", "Shutdown interrupt_in_urb\n");
1261                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1262                 }
1263         }
1264
1265         if (mos7840_port->write_urb) {
1266                 /* if this urb had a transfer buffer already (old tx) free it */
1267
1268                 if (mos7840_port->write_urb->transfer_buffer != NULL) {
1269                         kfree(mos7840_port->write_urb->transfer_buffer);
1270                 }
1271                 usb_free_urb(mos7840_port->write_urb);
1272         }
1273
1274         Data = 0x0;
1275         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1276
1277         Data = 0x00;
1278         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1279
1280         mos7840_port->open = 0;
1281
1282         dbg("%s \n", "Leaving ............");
1283 }
1284
1285 /************************************************************************
1286  *
1287  * mos7840_block_until_chase_response
1288  *
1289  *      This function will block the close until one of the following:
1290  *              1. Response to our Chase comes from mos7840
1291  *              2. A timeout of 10 seconds without activity has expired
1292  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1293  *
1294  ************************************************************************/
1295
1296 static void mos7840_block_until_chase_response(struct moschip_port
1297                                                *mos7840_port)
1298 {
1299         int timeout = 1 * HZ;
1300         int wait = 10;
1301         int count;
1302
1303         while (1) {
1304                 count = mos7840_chars_in_buffer(mos7840_port->port);
1305
1306                 /* Check for Buffer status */
1307                 if (count <= 0) {
1308                         return;
1309                 }
1310
1311                 /* Block the thread for a while */
1312                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1313                                                timeout);
1314                 /* No activity.. count down section */
1315                 wait--;
1316                 if (wait == 0) {
1317                         dbg("%s - TIMEOUT", __func__);
1318                         return;
1319                 } else {
1320                         /* Reset timeout value back to seconds */
1321                         wait = 10;
1322                 }
1323         }
1324
1325 }
1326
1327 /*****************************************************************************
1328  * mos7840_break
1329  *      this function sends a break to the port
1330  *****************************************************************************/
1331 static void mos7840_break(struct usb_serial_port *port, int break_state)
1332 {
1333         unsigned char data;
1334         struct usb_serial *serial;
1335         struct moschip_port *mos7840_port;
1336
1337         dbg("%s \n", "Entering ...........");
1338         dbg("mos7840_break: Start\n");
1339
1340         if (mos7840_port_paranoia_check(port, __func__)) {
1341                 dbg("%s", "Port Paranoia failed \n");
1342                 return;
1343         }
1344
1345         serial = mos7840_get_usb_serial(port, __func__);
1346         if (!serial) {
1347                 dbg("%s", "Serial Paranoia failed \n");
1348                 return;
1349         }
1350
1351         mos7840_port = mos7840_get_port_private(port);
1352
1353         if (mos7840_port == NULL) {
1354                 return;
1355         }
1356
1357         if (serial->dev) {
1358
1359                 /* flush and block until tx is empty */
1360                 mos7840_block_until_chase_response(mos7840_port);
1361         }
1362
1363         if (break_state == -1) {
1364                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1365         } else {
1366                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1367         }
1368
1369         mos7840_port->shadowLCR = data;
1370         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1371             mos7840_port->shadowLCR);
1372         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1373                              mos7840_port->shadowLCR);
1374
1375         return;
1376 }
1377
1378 /*****************************************************************************
1379  * mos7840_write_room
1380  *      this function is called by the tty driver when it wants to know how many
1381  *      bytes of data we can accept for a specific port.
1382  *      If successful, we return the amount of room that we have for this port
1383  *      Otherwise we return a negative error number.
1384  *****************************************************************************/
1385
1386 static int mos7840_write_room(struct usb_serial_port *port)
1387 {
1388         int i;
1389         int room = 0;
1390         unsigned long flags;
1391         struct moschip_port *mos7840_port;
1392
1393         dbg("%s \n", " mos7840_write_room:entering ...........");
1394
1395         if (mos7840_port_paranoia_check(port, __func__)) {
1396                 dbg("%s", "Invalid port \n");
1397                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1398                 return -1;
1399         }
1400
1401         mos7840_port = mos7840_get_port_private(port);
1402         if (mos7840_port == NULL) {
1403                 dbg("%s \n", "mos7840_break:leaving ...........");
1404                 return -1;
1405         }
1406
1407         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1408         for (i = 0; i < NUM_URBS; ++i) {
1409                 if (!mos7840_port->busy[i]) {
1410                         room += URB_TRANSFER_BUFFER_SIZE;
1411                 }
1412         }
1413         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1414
1415         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1416         dbg("%s - returns %d", __func__, room);
1417         return room;
1418
1419 }
1420
1421 /*****************************************************************************
1422  * mos7840_write
1423  *      this function is called by the tty driver when data should be written to
1424  *      the port.
1425  *      If successful, we return the number of bytes written, otherwise we
1426  *      return a negative error number.
1427  *****************************************************************************/
1428
1429 static int mos7840_write(struct usb_serial_port *port,
1430                          const unsigned char *data, int count)
1431 {
1432         int status;
1433         int i;
1434         int bytes_sent = 0;
1435         int transfer_size;
1436         unsigned long flags;
1437
1438         struct moschip_port *mos7840_port;
1439         struct usb_serial *serial;
1440         struct urb *urb;
1441         //__u16 Data;
1442         const unsigned char *current_position = data;
1443         unsigned char *data1;
1444         dbg("%s \n", "entering ...........");
1445         //dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",mos7840_port->shadowLCR);
1446
1447 #ifdef NOTMOS7840
1448         Data = 0x00;
1449         status = 0;
1450         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1451         mos7840_port->shadowLCR = Data;
1452         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1453         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1454             mos7840_port->shadowLCR);
1455
1456         //Data = 0x03;
1457         //status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data);
1458         //mos7840_port->shadowLCR=Data;//Need to add later
1459
1460         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
1461         status = 0;
1462         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1463
1464         //Data = 0x0c;
1465         //status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data);
1466         Data = 0x00;
1467         status = 0;
1468         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1469         dbg("mos7840_write:DLL value is %x\n", Data);
1470
1471         Data = 0x0;
1472         status = 0;
1473         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1474         dbg("mos7840_write:DLM value is %x\n", Data);
1475
1476         Data = Data & ~SERIAL_LCR_DLAB;
1477         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1478             mos7840_port->shadowLCR);
1479         status = 0;
1480         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1481 #endif
1482
1483         if (mos7840_port_paranoia_check(port, __func__)) {
1484                 dbg("%s", "Port Paranoia failed \n");
1485                 return -1;
1486         }
1487
1488         serial = port->serial;
1489         if (mos7840_serial_paranoia_check(serial, __func__)) {
1490                 dbg("%s", "Serial Paranoia failed \n");
1491                 return -1;
1492         }
1493
1494         mos7840_port = mos7840_get_port_private(port);
1495         if (mos7840_port == NULL) {
1496                 dbg("%s", "mos7840_port is NULL\n");
1497                 return -1;
1498         }
1499
1500         /* try to find a free urb in the list */
1501         urb = NULL;
1502
1503         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1504         for (i = 0; i < NUM_URBS; ++i) {
1505                 if (!mos7840_port->busy[i]) {
1506                         mos7840_port->busy[i] = 1;
1507                         urb = mos7840_port->write_urb_pool[i];
1508                         dbg("\nURB:%d", i);
1509                         break;
1510                 }
1511         }
1512         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1513
1514         if (urb == NULL) {
1515                 dbg("%s - no more free urbs", __func__);
1516                 goto exit;
1517         }
1518
1519         if (urb->transfer_buffer == NULL) {
1520                 urb->transfer_buffer =
1521                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1522
1523                 if (urb->transfer_buffer == NULL) {
1524                         err("%s no more kernel memory...", __func__);
1525                         goto exit;
1526                 }
1527         }
1528         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1529
1530         memcpy(urb->transfer_buffer, current_position, transfer_size);
1531
1532         /* fill urb with data and submit  */
1533         usb_fill_bulk_urb(urb,
1534                           serial->dev,
1535                           usb_sndbulkpipe(serial->dev,
1536                                           port->bulk_out_endpointAddress),
1537                           urb->transfer_buffer,
1538                           transfer_size,
1539                           mos7840_bulk_out_data_callback, mos7840_port);
1540
1541         data1 = urb->transfer_buffer;
1542         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1543
1544         /* send it down the pipe */
1545         status = usb_submit_urb(urb, GFP_ATOMIC);
1546
1547         if (status) {
1548                 mos7840_port->busy[i] = 0;
1549                 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1550                     __func__, status);
1551                 bytes_sent = status;
1552                 goto exit;
1553         }
1554         bytes_sent = transfer_size;
1555         mos7840_port->icount.tx += transfer_size;
1556         smp_wmb();
1557         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1558       exit:
1559
1560         return bytes_sent;
1561
1562 }
1563
1564 /*****************************************************************************
1565  * mos7840_throttle
1566  *      this function is called by the tty driver when it wants to stop the data
1567  *      being read from the port.
1568  *****************************************************************************/
1569
1570 static void mos7840_throttle(struct usb_serial_port *port)
1571 {
1572         struct moschip_port *mos7840_port;
1573         struct tty_struct *tty;
1574         int status;
1575
1576         if (mos7840_port_paranoia_check(port, __func__)) {
1577                 dbg("%s", "Invalid port \n");
1578                 return;
1579         }
1580
1581         dbg("- port %d\n", port->number);
1582
1583         mos7840_port = mos7840_get_port_private(port);
1584
1585         if (mos7840_port == NULL)
1586                 return;
1587
1588         if (!mos7840_port->open) {
1589                 dbg("%s\n", "port not opened");
1590                 return;
1591         }
1592
1593         dbg("%s", "Entering .......... \n");
1594
1595         tty = port->tty;
1596         if (!tty) {
1597                 dbg("%s - no tty available", __func__);
1598                 return;
1599         }
1600
1601         /* if we are implementing XON/XOFF, send the stop character */
1602         if (I_IXOFF(tty)) {
1603                 unsigned char stop_char = STOP_CHAR(tty);
1604                 status = mos7840_write(port, &stop_char, 1);
1605                 if (status <= 0) {
1606                         return;
1607                 }
1608         }
1609
1610         /* if we are implementing RTS/CTS, toggle that line */
1611         if (tty->termios->c_cflag & CRTSCTS) {
1612                 mos7840_port->shadowMCR &= ~MCR_RTS;
1613                 status = 0;
1614                 status =
1615                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1616                                          mos7840_port->shadowMCR);
1617
1618                 if (status < 0) {
1619                         return;
1620                 }
1621         }
1622
1623         return;
1624 }
1625
1626 /*****************************************************************************
1627  * mos7840_unthrottle
1628  *      this function is called by the tty driver when it wants to resume the data
1629  *      being read from the port (called after SerialThrottle is called)
1630  *****************************************************************************/
1631 static void mos7840_unthrottle(struct usb_serial_port *port)
1632 {
1633         struct tty_struct *tty;
1634         int status;
1635         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1636
1637         if (mos7840_port_paranoia_check(port, __func__)) {
1638                 dbg("%s", "Invalid port \n");
1639                 return;
1640         }
1641
1642         if (mos7840_port == NULL)
1643                 return;
1644
1645         if (!mos7840_port->open) {
1646                 dbg("%s - port not opened", __func__);
1647                 return;
1648         }
1649
1650         dbg("%s", "Entering .......... \n");
1651
1652         tty = port->tty;
1653         if (!tty) {
1654                 dbg("%s - no tty available", __func__);
1655                 return;
1656         }
1657
1658         /* if we are implementing XON/XOFF, send the start character */
1659         if (I_IXOFF(tty)) {
1660                 unsigned char start_char = START_CHAR(tty);
1661                 status = mos7840_write(port, &start_char, 1);
1662                 if (status <= 0) {
1663                         return;
1664                 }
1665         }
1666
1667         /* if we are implementing RTS/CTS, toggle that line */
1668         if (tty->termios->c_cflag & CRTSCTS) {
1669                 mos7840_port->shadowMCR |= MCR_RTS;
1670                 status = 0;
1671                 status =
1672                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1673                                          mos7840_port->shadowMCR);
1674                 if (status < 0) {
1675                         return;
1676                 }
1677         }
1678
1679         return;
1680 }
1681
1682 static int mos7840_tiocmget(struct usb_serial_port *port, struct file *file)
1683 {
1684         struct moschip_port *mos7840_port;
1685         unsigned int result;
1686         __u16 msr;
1687         __u16 mcr;
1688         int status = 0;
1689         mos7840_port = mos7840_get_port_private(port);
1690
1691         dbg("%s - port %d", __func__, port->number);
1692
1693         if (mos7840_port == NULL)
1694                 return -ENODEV;
1695
1696         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1697         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1698         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1699             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1700             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1701             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1702             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1703             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1704             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1705
1706         dbg("%s - 0x%04X", __func__, result);
1707
1708         return result;
1709 }
1710
1711 static int mos7840_tiocmset(struct usb_serial_port *port, struct file *file,
1712                             unsigned int set, unsigned int clear)
1713 {
1714         struct moschip_port *mos7840_port;
1715         unsigned int mcr;
1716         int status;
1717
1718         dbg("%s - port %d", __func__, port->number);
1719
1720         mos7840_port = mos7840_get_port_private(port);
1721
1722         if (mos7840_port == NULL)
1723                 return -ENODEV;
1724
1725         /* FIXME: What locks the port registers ? */
1726         mcr = mos7840_port->shadowMCR;
1727         if (clear & TIOCM_RTS)
1728                 mcr &= ~MCR_RTS;
1729         if (clear & TIOCM_DTR)
1730                 mcr &= ~MCR_DTR;
1731         if (clear & TIOCM_LOOP)
1732                 mcr &= ~MCR_LOOPBACK;
1733
1734         if (set & TIOCM_RTS)
1735                 mcr |= MCR_RTS;
1736         if (set & TIOCM_DTR)
1737                 mcr |= MCR_DTR;
1738         if (set & TIOCM_LOOP)
1739                 mcr |= MCR_LOOPBACK;
1740
1741         mos7840_port->shadowMCR = mcr;
1742
1743         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1744         if (status < 0) {
1745                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1746                 return status;
1747         }
1748
1749         return 0;
1750 }
1751
1752 /*****************************************************************************
1753  * mos7840_calc_baud_rate_divisor
1754  *      this function calculates the proper baud rate divisor for the specified
1755  *      baud rate.
1756  *****************************************************************************/
1757 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1758                                           __u16 * clk_sel_val)
1759 {
1760
1761         dbg("%s - %d", __func__, baudRate);
1762
1763         if (baudRate <= 115200) {
1764                 *divisor = 115200 / baudRate;
1765                 *clk_sel_val = 0x0;
1766         }
1767         if ((baudRate > 115200) && (baudRate <= 230400)) {
1768                 *divisor = 230400 / baudRate;
1769                 *clk_sel_val = 0x10;
1770         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1771                 *divisor = 403200 / baudRate;
1772                 *clk_sel_val = 0x20;
1773         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1774                 *divisor = 460800 / baudRate;
1775                 *clk_sel_val = 0x30;
1776         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1777                 *divisor = 806400 / baudRate;
1778                 *clk_sel_val = 0x40;
1779         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1780                 *divisor = 921600 / baudRate;
1781                 *clk_sel_val = 0x50;
1782         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1783                 *divisor = 1572864 / baudRate;
1784                 *clk_sel_val = 0x60;
1785         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1786                 *divisor = 3145728 / baudRate;
1787                 *clk_sel_val = 0x70;
1788         }
1789         return 0;
1790
1791 #ifdef NOTMCS7840
1792
1793         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1794                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1795                         *divisor = mos7840_divisor_table[i].Divisor;
1796                         return 0;
1797                 }
1798         }
1799
1800         /* After trying for all the standard baud rates    *
1801          * Try calculating the divisor for this baud rate  */
1802
1803         if (baudrate > 75 && baudrate < 230400) {
1804                 /* get the divisor */
1805                 custom = (__u16) (230400L / baudrate);
1806
1807                 /* Check for round off */
1808                 round1 = (__u16) (2304000L / baudrate);
1809                 round = (__u16) (round1 - (custom * 10));
1810                 if (round > 4) {
1811                         custom++;
1812                 }
1813                 *divisor = custom;
1814
1815                 dbg(" Baud %d = %d\n", baudrate, custom);
1816                 return 0;
1817         }
1818
1819         dbg("%s\n", " Baud calculation Failed...");
1820         return -1;
1821 #endif
1822 }
1823
1824 /*****************************************************************************
1825  * mos7840_send_cmd_write_baud_rate
1826  *      this function sends the proper command to change the baud rate of the
1827  *      specified port.
1828  *****************************************************************************/
1829
1830 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1831                                             int baudRate)
1832 {
1833         int divisor = 0;
1834         int status;
1835         __u16 Data;
1836         unsigned char number;
1837         __u16 clk_sel_val;
1838         struct usb_serial_port *port;
1839
1840         if (mos7840_port == NULL)
1841                 return -1;
1842
1843         port = (struct usb_serial_port *)mos7840_port->port;
1844         if (mos7840_port_paranoia_check(port, __func__)) {
1845                 dbg("%s", "Invalid port \n");
1846                 return -1;
1847         }
1848
1849         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1850                 dbg("%s", "Invalid Serial \n");
1851                 return -1;
1852         }
1853
1854         dbg("%s", "Entering .......... \n");
1855
1856         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1857
1858         dbg("%s - port = %d, baud = %d", __func__,
1859             mos7840_port->port->number, baudRate);
1860         //reset clk_uart_sel in spregOffset
1861         if (baudRate > 115200) {
1862 #ifdef HW_flow_control
1863                 //NOTE: need to see the pther register to modify
1864                 //setting h/w flow control bit to 1;
1865                 status = 0;
1866                 Data = 0x2b;
1867                 mos7840_port->shadowMCR = Data;
1868                 status =
1869                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1870                 if (status < 0) {
1871                         dbg("Writing spreg failed in set_serial_baud\n");
1872                         return -1;
1873                 }
1874 #endif
1875
1876         } else {
1877 #ifdef HW_flow_control
1878                 //setting h/w flow control bit to 0;
1879                 status = 0;
1880                 Data = 0xb;
1881                 mos7840_port->shadowMCR = Data;
1882                 status =
1883                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1884                 if (status < 0) {
1885                         dbg("Writing spreg failed in set_serial_baud\n");
1886                         return -1;
1887                 }
1888 #endif
1889
1890         }
1891
1892         if (1)                  //baudRate <= 115200)
1893         {
1894                 clk_sel_val = 0x0;
1895                 Data = 0x0;
1896                 status = 0;
1897                 status =
1898                     mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1899                                                    &clk_sel_val);
1900                 status =
1901                     mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1902                                          &Data);
1903                 if (status < 0) {
1904                         dbg("reading spreg failed in set_serial_baud\n");
1905                         return -1;
1906                 }
1907                 Data = (Data & 0x8f) | clk_sel_val;
1908                 status = 0;
1909                 status =
1910                     mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1911                 if (status < 0) {
1912                         dbg("Writing spreg failed in set_serial_baud\n");
1913                         return -1;
1914                 }
1915                 /* Calculate the Divisor */
1916
1917                 if (status) {
1918                         err("%s - bad baud rate", __func__);
1919                         dbg("%s\n", "bad baud rate");
1920                         return status;
1921                 }
1922                 /* Enable access to divisor latch */
1923                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1924                 mos7840_port->shadowLCR = Data;
1925                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1926
1927                 /* Write the divisor */
1928                 Data = (unsigned char)(divisor & 0xff);
1929                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1930                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1931
1932                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1933                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1934                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1935
1936                 /* Disable access to divisor latch */
1937                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1938                 mos7840_port->shadowLCR = Data;
1939                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1940
1941         }
1942
1943         return status;
1944 }
1945
1946 /*****************************************************************************
1947  * mos7840_change_port_settings
1948  *      This routine is called to set the UART on the device to match
1949  *      the specified new settings.
1950  *****************************************************************************/
1951
1952 static void mos7840_change_port_settings(struct moschip_port *mos7840_port,
1953                                          struct ktermios *old_termios)
1954 {
1955         struct tty_struct *tty;
1956         int baud;
1957         unsigned cflag;
1958         unsigned iflag;
1959         __u8 lData;
1960         __u8 lParity;
1961         __u8 lStop;
1962         int status;
1963         __u16 Data;
1964         struct usb_serial_port *port;
1965         struct usb_serial *serial;
1966
1967         if (mos7840_port == NULL)
1968                 return;
1969
1970         port = (struct usb_serial_port *)mos7840_port->port;
1971
1972         if (mos7840_port_paranoia_check(port, __func__)) {
1973                 dbg("%s", "Invalid port \n");
1974                 return;
1975         }
1976
1977         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1978                 dbg("%s", "Invalid Serial \n");
1979                 return;
1980         }
1981
1982         serial = port->serial;
1983
1984         dbg("%s - port %d", __func__, mos7840_port->port->number);
1985
1986         if (!mos7840_port->open) {
1987                 dbg("%s - port not opened", __func__);
1988                 return;
1989         }
1990
1991         tty = mos7840_port->port->tty;
1992
1993         dbg("%s", "Entering .......... \n");
1994
1995         lData = LCR_BITS_8;
1996         lStop = LCR_STOP_1;
1997         lParity = LCR_PAR_NONE;
1998
1999         cflag = tty->termios->c_cflag;
2000         iflag = tty->termios->c_iflag;
2001
2002         /* Change the number of bits */
2003         if (cflag & CSIZE) {
2004                 switch (cflag & CSIZE) {
2005                 case CS5:
2006                         lData = LCR_BITS_5;
2007                         break;
2008
2009                 case CS6:
2010                         lData = LCR_BITS_6;
2011                         break;
2012
2013                 case CS7:
2014                         lData = LCR_BITS_7;
2015                         break;
2016                 default:
2017                 case CS8:
2018                         lData = LCR_BITS_8;
2019                         break;
2020                 }
2021         }
2022         /* Change the Parity bit */
2023         if (cflag & PARENB) {
2024                 if (cflag & PARODD) {
2025                         lParity = LCR_PAR_ODD;
2026                         dbg("%s - parity = odd", __func__);
2027                 } else {
2028                         lParity = LCR_PAR_EVEN;
2029                         dbg("%s - parity = even", __func__);
2030                 }
2031
2032         } else {
2033                 dbg("%s - parity = none", __func__);
2034         }
2035
2036         if (cflag & CMSPAR) {
2037                 lParity = lParity | 0x20;
2038         }
2039
2040         /* Change the Stop bit */
2041         if (cflag & CSTOPB) {
2042                 lStop = LCR_STOP_2;
2043                 dbg("%s - stop bits = 2", __func__);
2044         } else {
2045                 lStop = LCR_STOP_1;
2046                 dbg("%s - stop bits = 1", __func__);
2047         }
2048
2049         /* Update the LCR with the correct value */
2050         mos7840_port->shadowLCR &=
2051             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2052         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2053
2054         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2055             mos7840_port->shadowLCR);
2056         /* Disable Interrupts */
2057         Data = 0x00;
2058         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2059
2060         Data = 0x00;
2061         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2062
2063         Data = 0xcf;
2064         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2065
2066         /* Send the updated LCR value to the mos7840 */
2067         Data = mos7840_port->shadowLCR;
2068
2069         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2070
2071         Data = 0x00b;
2072         mos7840_port->shadowMCR = Data;
2073         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2074         Data = 0x00b;
2075         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2076
2077         /* set up the MCR register and send it to the mos7840 */
2078
2079         mos7840_port->shadowMCR = MCR_MASTER_IE;
2080         if (cflag & CBAUD) {
2081                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2082         }
2083
2084         if (cflag & CRTSCTS) {
2085                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2086
2087         } else {
2088                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2089         }
2090
2091         Data = mos7840_port->shadowMCR;
2092         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2093
2094         /* Determine divisor based on baud rate */
2095         baud = tty_get_baud_rate(tty);
2096
2097         if (!baud) {
2098                 /* pick a default, any default... */
2099                 dbg("%s\n", "Picked default baud...");
2100                 baud = 9600;
2101         }
2102
2103         dbg("%s - baud rate = %d", __func__, baud);
2104         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2105
2106         /* Enable Interrupts */
2107         Data = 0x0c;
2108         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2109
2110         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2111                 mos7840_port->read_urb->dev = serial->dev;
2112
2113                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2114
2115                 if (status) {
2116                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2117                             status);
2118                 }
2119         }
2120         wake_up(&mos7840_port->delta_msr_wait);
2121         mos7840_port->delta_msr_cond = 1;
2122         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2123             mos7840_port->shadowLCR);
2124
2125         return;
2126 }
2127
2128 /*****************************************************************************
2129  * mos7840_set_termios
2130  *      this function is called by the tty driver when it wants to change
2131  *      the termios structure
2132  *****************************************************************************/
2133
2134 static void mos7840_set_termios(struct usb_serial_port *port,
2135                                 struct ktermios *old_termios)
2136 {
2137         int status;
2138         unsigned int cflag;
2139         struct usb_serial *serial;
2140         struct moschip_port *mos7840_port;
2141         struct tty_struct *tty;
2142         dbg("mos7840_set_termios: START\n");
2143         if (mos7840_port_paranoia_check(port, __func__)) {
2144                 dbg("%s", "Invalid port \n");
2145                 return;
2146         }
2147
2148         serial = port->serial;
2149
2150         if (mos7840_serial_paranoia_check(serial, __func__)) {
2151                 dbg("%s", "Invalid Serial \n");
2152                 return;
2153         }
2154
2155         mos7840_port = mos7840_get_port_private(port);
2156
2157         if (mos7840_port == NULL)
2158                 return;
2159
2160         tty = port->tty;
2161
2162         if (!mos7840_port->open) {
2163                 dbg("%s - port not opened", __func__);
2164                 return;
2165         }
2166
2167         dbg("%s\n", "setting termios - ");
2168
2169         cflag = tty->termios->c_cflag;
2170
2171         dbg("%s - clfag %08x iflag %08x", __func__,
2172             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2173         dbg("%s - old clfag %08x old iflag %08x", __func__,
2174             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2175         dbg("%s - port %d", __func__, port->number);
2176
2177         /* change the port settings to the new ones specified */
2178
2179         mos7840_change_port_settings(mos7840_port, old_termios);
2180
2181         if (!mos7840_port->read_urb) {
2182                 dbg("%s", "URB KILLED !!!!!\n");
2183                 return;
2184         }
2185
2186         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2187                 mos7840_port->read_urb->dev = serial->dev;
2188                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2189                 if (status) {
2190                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2191                             status);
2192                 }
2193         }
2194         return;
2195 }
2196
2197 /*****************************************************************************
2198  * mos7840_get_lsr_info - get line status register info
2199  *
2200  * Purpose: Let user call ioctl() to get info when the UART physically
2201  *          is emptied.  On bus types like RS485, the transmitter must
2202  *          release the bus after transmitting. This must be done when
2203  *          the transmit shift register is empty, not be done when the
2204  *          transmit holding register is empty.  This functionality
2205  *          allows an RS485 driver to be written in user space.
2206  *****************************************************************************/
2207
2208 static int mos7840_get_lsr_info(struct moschip_port *mos7840_port,
2209                                 unsigned int __user *value)
2210 {
2211         int count;
2212         unsigned int result = 0;
2213
2214         count = mos7840_chars_in_buffer(mos7840_port->port);
2215         if (count == 0) {
2216                 dbg("%s -- Empty", __func__);
2217                 result = TIOCSER_TEMT;
2218         }
2219
2220         if (copy_to_user(value, &result, sizeof(int)))
2221                 return -EFAULT;
2222         return 0;
2223 }
2224
2225 /*****************************************************************************
2226  * mos7840_set_modem_info
2227  *      function to set modem info
2228  *****************************************************************************/
2229
2230 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2231                                   unsigned int cmd, unsigned int __user *value)
2232 {
2233         unsigned int mcr;
2234         unsigned int arg;
2235         __u16 Data;
2236         int status;
2237         struct usb_serial_port *port;
2238
2239         if (mos7840_port == NULL)
2240                 return -1;
2241
2242         port = (struct usb_serial_port *)mos7840_port->port;
2243         if (mos7840_port_paranoia_check(port, __func__)) {
2244                 dbg("%s", "Invalid port \n");
2245                 return -1;
2246         }
2247
2248         mcr = mos7840_port->shadowMCR;
2249
2250         if (copy_from_user(&arg, value, sizeof(int)))
2251                 return -EFAULT;
2252
2253         switch (cmd) {
2254         case TIOCMBIS:
2255                 if (arg & TIOCM_RTS)
2256                         mcr |= MCR_RTS;
2257                 if (arg & TIOCM_DTR)
2258                         mcr |= MCR_RTS;
2259                 if (arg & TIOCM_LOOP)
2260                         mcr |= MCR_LOOPBACK;
2261                 break;
2262
2263         case TIOCMBIC:
2264                 if (arg & TIOCM_RTS)
2265                         mcr &= ~MCR_RTS;
2266                 if (arg & TIOCM_DTR)
2267                         mcr &= ~MCR_RTS;
2268                 if (arg & TIOCM_LOOP)
2269                         mcr &= ~MCR_LOOPBACK;
2270                 break;
2271
2272         case TIOCMSET:
2273                 /* turn off the RTS and DTR and LOOPBACK
2274                  * and then only turn on what was asked to */
2275                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2276                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2277                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2278                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2279                 break;
2280         }
2281
2282         mos7840_port->shadowMCR = mcr;
2283
2284         Data = mos7840_port->shadowMCR;
2285         status = 0;
2286         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2287         if (status < 0) {
2288                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2289                 return -1;
2290         }
2291
2292         return 0;
2293 }
2294
2295 /*****************************************************************************
2296  * mos7840_get_modem_info
2297  *      function to get modem info
2298  *****************************************************************************/
2299
2300 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2301                                   unsigned int __user *value)
2302 {
2303         unsigned int result = 0;
2304         __u16 msr;
2305         unsigned int mcr = mos7840_port->shadowMCR;
2306         int status = 0;
2307         status =
2308             mos7840_get_uart_reg(mos7840_port->port, MODEM_STATUS_REGISTER,
2309                                  &msr);
2310         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2311             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2312             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2313             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2314             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2315             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2316
2317         dbg("%s -- %x", __func__, result);
2318
2319         if (copy_to_user(value, &result, sizeof(int)))
2320                 return -EFAULT;
2321         return 0;
2322 }
2323
2324 /*****************************************************************************
2325  * mos7840_get_serial_info
2326  *      function to get information about serial port
2327  *****************************************************************************/
2328
2329 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2330                                    struct serial_struct __user *retinfo)
2331 {
2332         struct serial_struct tmp;
2333
2334         if (mos7840_port == NULL)
2335                 return -1;
2336
2337         if (!retinfo)
2338                 return -EFAULT;
2339
2340         memset(&tmp, 0, sizeof(tmp));
2341
2342         tmp.type = PORT_16550A;
2343         tmp.line = mos7840_port->port->serial->minor;
2344         tmp.port = mos7840_port->port->number;
2345         tmp.irq = 0;
2346         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2347         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2348         tmp.baud_base = 9600;
2349         tmp.close_delay = 5 * HZ;
2350         tmp.closing_wait = 30 * HZ;
2351
2352         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2353                 return -EFAULT;
2354         return 0;
2355 }
2356
2357 /*****************************************************************************
2358  * SerialIoctl
2359  *      this function handles any ioctl calls to the driver
2360  *****************************************************************************/
2361
2362 static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
2363                          unsigned int cmd, unsigned long arg)
2364 {
2365         void __user *argp = (void __user *)arg;
2366         struct moschip_port *mos7840_port;
2367         struct tty_struct *tty;
2368
2369         struct async_icount cnow;
2370         struct async_icount cprev;
2371         struct serial_icounter_struct icount;
2372         int mosret = 0;
2373
2374         if (mos7840_port_paranoia_check(port, __func__)) {
2375                 dbg("%s", "Invalid port \n");
2376                 return -1;
2377         }
2378
2379         mos7840_port = mos7840_get_port_private(port);
2380
2381         if (mos7840_port == NULL)
2382                 return -1;
2383
2384         tty = mos7840_port->port->tty;
2385
2386         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2387
2388         switch (cmd) {
2389                 /* return number of bytes available */
2390
2391         case TIOCSERGETLSR:
2392                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2393                 return mos7840_get_lsr_info(mos7840_port, argp);
2394                 return 0;
2395
2396         case TIOCMBIS:
2397         case TIOCMBIC:
2398         case TIOCMSET:
2399                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2400                     port->number);
2401                 mosret =
2402                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2403                 return mosret;
2404
2405         case TIOCMGET:
2406                 dbg("%s (%d) TIOCMGET", __func__, port->number);
2407                 return mos7840_get_modem_info(mos7840_port, argp);
2408
2409         case TIOCGSERIAL:
2410                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2411                 return mos7840_get_serial_info(mos7840_port, argp);
2412
2413         case TIOCSSERIAL:
2414                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2415                 break;
2416
2417         case TIOCMIWAIT:
2418                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2419                 cprev = mos7840_port->icount;
2420                 while (1) {
2421                         //interruptible_sleep_on(&mos7840_port->delta_msr_wait);
2422                         mos7840_port->delta_msr_cond = 0;
2423                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2424                                                  (mos7840_port->
2425                                                   delta_msr_cond == 1));
2426
2427                         /* see if a signal did it */
2428                         if (signal_pending(current))
2429                                 return -ERESTARTSYS;
2430                         cnow = mos7840_port->icount;
2431                         smp_rmb();
2432                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2433                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2434                                 return -EIO;    /* no change => error */
2435                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2436                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2437                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2438                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2439                                 return 0;
2440                         }
2441                         cprev = cnow;
2442                 }
2443                 /* NOTREACHED */
2444                 break;
2445
2446         case TIOCGICOUNT:
2447                 cnow = mos7840_port->icount;
2448                 smp_rmb();
2449                 icount.cts = cnow.cts;
2450                 icount.dsr = cnow.dsr;
2451                 icount.rng = cnow.rng;
2452                 icount.dcd = cnow.dcd;
2453                 icount.rx = cnow.rx;
2454                 icount.tx = cnow.tx;
2455                 icount.frame = cnow.frame;
2456                 icount.overrun = cnow.overrun;
2457                 icount.parity = cnow.parity;
2458                 icount.brk = cnow.brk;
2459                 icount.buf_overrun = cnow.buf_overrun;
2460
2461                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2462                     port->number, icount.rx, icount.tx);
2463                 if (copy_to_user(argp, &icount, sizeof(icount)))
2464                         return -EFAULT;
2465                 return 0;
2466
2467         case TIOCEXBAUD:
2468                 return 0;
2469         default:
2470                 break;
2471         }
2472
2473         return -ENOIOCTLCMD;
2474 }
2475
2476 static int mos7840_calc_num_ports(struct usb_serial *serial)
2477 {
2478         int mos7840_num_ports = 0;
2479
2480         dbg("numberofendpoints: %d \n",
2481             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2482         dbg("numberofendpoints: %d \n",
2483             (int)serial->interface->altsetting->desc.bNumEndpoints);
2484         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2485                 mos7840_num_ports = serial->num_ports = 2;
2486         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2487                 serial->num_bulk_in = 4;
2488                 serial->num_bulk_out = 4;
2489                 mos7840_num_ports = serial->num_ports = 4;
2490         }
2491
2492         return mos7840_num_ports;
2493 }
2494
2495 /****************************************************************************
2496  * mos7840_startup
2497  ****************************************************************************/
2498
2499 static int mos7840_startup(struct usb_serial *serial)
2500 {
2501         struct moschip_port *mos7840_port;
2502         struct usb_device *dev;
2503         int i, status;
2504
2505         __u16 Data;
2506         dbg("%s \n", " mos7840_startup :entering..........");
2507
2508         if (!serial) {
2509                 dbg("%s\n", "Invalid Handler");
2510                 return -1;
2511         }
2512
2513         dev = serial->dev;
2514
2515         dbg("%s\n", "Entering...");
2516
2517         /* we set up the pointers to the endpoints in the mos7840_open *
2518          * function, as the structures aren't created yet.             */
2519
2520         /* set up port private structures */
2521         for (i = 0; i < serial->num_ports; ++i) {
2522                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2523                 if (mos7840_port == NULL) {
2524                         err("%s - Out of memory", __func__);
2525                         status = -ENOMEM;
2526                         i--; /* don't follow NULL pointer cleaning up */
2527                         goto error;
2528                 }
2529
2530                 /* Initialize all port interrupt end point to port 0 int endpoint *
2531                  * Our device has only one interrupt end point comman to all port */
2532
2533                 mos7840_port->port = serial->port[i];
2534                 mos7840_set_port_private(serial->port[i], mos7840_port);
2535                 spin_lock_init(&mos7840_port->pool_lock);
2536
2537                 mos7840_port->port_num = ((serial->port[i]->number -
2538                                            (serial->port[i]->serial->minor)) +
2539                                           1);
2540
2541                 if (mos7840_port->port_num == 1) {
2542                         mos7840_port->SpRegOffset = 0x0;
2543                         mos7840_port->ControlRegOffset = 0x1;
2544                         mos7840_port->DcrRegOffset = 0x4;
2545                 } else if ((mos7840_port->port_num == 2)
2546                            && (serial->num_ports == 4)) {
2547                         mos7840_port->SpRegOffset = 0x8;
2548                         mos7840_port->ControlRegOffset = 0x9;
2549                         mos7840_port->DcrRegOffset = 0x16;
2550                 } else if ((mos7840_port->port_num == 2)
2551                            && (serial->num_ports == 2)) {
2552                         mos7840_port->SpRegOffset = 0xa;
2553                         mos7840_port->ControlRegOffset = 0xb;
2554                         mos7840_port->DcrRegOffset = 0x19;
2555                 } else if ((mos7840_port->port_num == 3)
2556                            && (serial->num_ports == 4)) {
2557                         mos7840_port->SpRegOffset = 0xa;
2558                         mos7840_port->ControlRegOffset = 0xb;
2559                         mos7840_port->DcrRegOffset = 0x19;
2560                 } else if ((mos7840_port->port_num == 4)
2561                            && (serial->num_ports == 4)) {
2562                         mos7840_port->SpRegOffset = 0xc;
2563                         mos7840_port->ControlRegOffset = 0xd;
2564                         mos7840_port->DcrRegOffset = 0x1c;
2565                 }
2566                 mos7840_dump_serial_port(mos7840_port);
2567
2568                 mos7840_set_port_private(serial->port[i], mos7840_port);
2569
2570                 //enable rx_disable bit in control register
2571
2572                 status =
2573                     mos7840_get_reg_sync(serial->port[i],
2574                                          mos7840_port->ControlRegOffset, &Data);
2575                 if (status < 0) {
2576                         dbg("Reading ControlReg failed status-0x%x\n", status);
2577                         break;
2578                 } else
2579                         dbg("ControlReg Reading success val is %x, status%d\n",
2580                             Data, status);
2581                 Data |= 0x08;   //setting driver done bit
2582                 Data |= 0x04;   //sp1_bit to have cts change reflect in modem status reg
2583
2584                 //Data |= 0x20; //rx_disable bit
2585                 status = 0;
2586                 status =
2587                     mos7840_set_reg_sync(serial->port[i],
2588                                          mos7840_port->ControlRegOffset, Data);
2589                 if (status < 0) {
2590                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2591                         break;
2592                 } else
2593                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2594                             status);
2595
2596                 //Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 and 0x24 in DCR3
2597                 Data = 0x01;
2598                 status = 0;
2599                 status =
2600                     mos7840_set_reg_sync(serial->port[i],
2601                                          (__u16) (mos7840_port->DcrRegOffset +
2602                                                   0), Data);
2603                 if (status < 0) {
2604                         dbg("Writing DCR0 failed status-0x%x\n", status);
2605                         break;
2606                 } else
2607                         dbg("DCR0 Writing success status%d\n", status);
2608
2609                 Data = 0x05;
2610                 status = 0;
2611                 status =
2612                     mos7840_set_reg_sync(serial->port[i],
2613                                          (__u16) (mos7840_port->DcrRegOffset +
2614                                                   1), Data);
2615                 if (status < 0) {
2616                         dbg("Writing DCR1 failed status-0x%x\n", status);
2617                         break;
2618                 } else
2619                         dbg("DCR1 Writing success status%d\n", status);
2620
2621                 Data = 0x24;
2622                 status = 0;
2623                 status =
2624                     mos7840_set_reg_sync(serial->port[i],
2625                                          (__u16) (mos7840_port->DcrRegOffset +
2626                                                   2), Data);
2627                 if (status < 0) {
2628                         dbg("Writing DCR2 failed status-0x%x\n", status);
2629                         break;
2630                 } else
2631                         dbg("DCR2 Writing success status%d\n", status);
2632
2633                 // write values in clkstart0x0 and clkmulti 0x20
2634                 Data = 0x0;
2635                 status = 0;
2636                 status =
2637                     mos7840_set_reg_sync(serial->port[i],
2638                                          CLK_START_VALUE_REGISTER, Data);
2639                 if (status < 0) {
2640                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2641                         break;
2642                 } else
2643                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2644
2645                 Data = 0x20;
2646                 status =
2647                     mos7840_set_reg_sync(serial->port[i], CLK_MULTI_REGISTER,
2648                                          Data);
2649                 if (status < 0) {
2650                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2651                             status);
2652                         goto error;
2653                 } else
2654                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2655                             status);
2656
2657                 //write value 0x0 to scratchpad register
2658                 Data = 0x00;
2659                 status =
2660                     mos7840_set_uart_reg(serial->port[i], SCRATCH_PAD_REGISTER,
2661                                          Data);
2662                 if (status < 0) {
2663                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2664                             status);
2665                         break;
2666                 } else
2667                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2668                             status);
2669
2670                 //Zero Length flag register
2671                 if ((mos7840_port->port_num != 1)
2672                     && (serial->num_ports == 2)) {
2673
2674                         Data = 0xff;
2675                         status = 0;
2676                         status = mos7840_set_reg_sync(serial->port[i],
2677                                                       (__u16) (ZLP_REG1 +
2678                                                                ((__u16)
2679                                                                 mos7840_port->
2680                                                                 port_num)),
2681                                                       Data);
2682                         dbg("ZLIP offset%x\n",
2683                             (__u16) (ZLP_REG1 +
2684                                      ((__u16) mos7840_port->port_num)));
2685                         if (status < 0) {
2686                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2687                                     i + 2, status);
2688                                 break;
2689                         } else
2690                                 dbg("ZLP_REG%d Writing success status%d\n",
2691                                     i + 2, status);
2692                 } else {
2693                         Data = 0xff;
2694                         status = 0;
2695                         status = mos7840_set_reg_sync(serial->port[i],
2696                                                       (__u16) (ZLP_REG1 +
2697                                                                ((__u16)
2698                                                                 mos7840_port->
2699                                                                 port_num) -
2700                                                                0x1), Data);
2701                         dbg("ZLIP offset%x\n",
2702                             (__u16) (ZLP_REG1 +
2703                                      ((__u16) mos7840_port->port_num) - 0x1));
2704                         if (status < 0) {
2705                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2706                                     i + 1, status);
2707                                 break;
2708                         } else
2709                                 dbg("ZLP_REG%d Writing success status%d\n",
2710                                     i + 1, status);
2711
2712                 }
2713                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2714                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2715                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
2716                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf || !mos7840_port->dr) {
2717                         status = -ENOMEM;
2718                         goto error;
2719                 }
2720         }
2721
2722         //Zero Length flag enable
2723         Data = 0x0f;
2724         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2725         if (status < 0) {
2726                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2727                 goto error;
2728         } else
2729                 dbg("ZLP_REG5 Writing success status%d\n", status);
2730
2731         /* setting configuration feature to one */
2732         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2733                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2734         return 0;
2735 error:
2736         for (/* nothing */; i >= 0; i--) {
2737                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2738
2739                 kfree(mos7840_port->dr);
2740                 kfree(mos7840_port->ctrl_buf);
2741                 usb_free_urb(mos7840_port->control_urb);
2742                 kfree(mos7840_port);
2743                 serial->port[i] = NULL;
2744         }
2745         return status;
2746 }
2747
2748 /****************************************************************************
2749  * mos7840_shutdown
2750  *      This function is called whenever the device is removed from the usb bus.
2751  ****************************************************************************/
2752
2753 static void mos7840_shutdown(struct usb_serial *serial)
2754 {
2755         int i;
2756         unsigned long flags;
2757         struct moschip_port *mos7840_port;
2758         dbg("%s \n", " shutdown :entering..........");
2759
2760         if (!serial) {
2761                 dbg("%s", "Invalid Handler \n");
2762                 return;
2763         }
2764
2765         /*      check for the ports to be closed,close the ports and disconnect         */
2766
2767         /* free private structure allocated for serial port  *
2768          * stop reads and writes on all ports                */
2769
2770         for (i = 0; i < serial->num_ports; ++i) {
2771                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2772                 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2773                 mos7840_port->zombie = 1;
2774                 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2775                 usb_kill_urb(mos7840_port->control_urb);
2776                 kfree(mos7840_port->ctrl_buf);
2777                 kfree(mos7840_port->dr);
2778                 kfree(mos7840_port);
2779                 mos7840_set_port_private(serial->port[i], NULL);
2780         }
2781
2782         dbg("%s\n", "Thank u :: ");
2783
2784 }
2785
2786 static struct usb_driver io_driver = {
2787         .name = "mos7840",
2788         .probe = usb_serial_probe,
2789         .disconnect = usb_serial_disconnect,
2790         .id_table = moschip_id_table_combined,
2791         .no_dynamic_id = 1,
2792 };
2793
2794 static struct usb_serial_driver moschip7840_4port_device = {
2795         .driver = {
2796                    .owner = THIS_MODULE,
2797                    .name = "mos7840",
2798                    },
2799         .description = DRIVER_DESC,
2800         .usb_driver = &io_driver,
2801         .id_table = moschip_port_id_table,
2802         .num_ports = 4,
2803         .open = mos7840_open,
2804         .close = mos7840_close,
2805         .write = mos7840_write,
2806         .write_room = mos7840_write_room,
2807         .chars_in_buffer = mos7840_chars_in_buffer,
2808         .throttle = mos7840_throttle,
2809         .unthrottle = mos7840_unthrottle,
2810         .calc_num_ports = mos7840_calc_num_ports,
2811 #ifdef MCSSerialProbe
2812         .probe = mos7840_serial_probe,
2813 #endif
2814         .ioctl = mos7840_ioctl,
2815         .set_termios = mos7840_set_termios,
2816         .break_ctl = mos7840_break,
2817         .tiocmget = mos7840_tiocmget,
2818         .tiocmset = mos7840_tiocmset,
2819         .attach = mos7840_startup,
2820         .shutdown = mos7840_shutdown,
2821         .read_bulk_callback = mos7840_bulk_in_callback,
2822         .read_int_callback = mos7840_interrupt_callback,
2823 };
2824
2825 /****************************************************************************
2826  * moschip7840_init
2827  *      This is called by the module subsystem, or on startup to initialize us
2828  ****************************************************************************/
2829 static int __init moschip7840_init(void)
2830 {
2831         int retval;
2832
2833         dbg("%s \n", " mos7840_init :entering..........");
2834
2835         /* Register with the usb serial */
2836         retval = usb_serial_register(&moschip7840_4port_device);
2837
2838         if (retval)
2839                 goto failed_port_device_register;
2840
2841         dbg("%s\n", "Entring...");
2842         info(DRIVER_DESC " " DRIVER_VERSION);
2843
2844         /* Register with the usb */
2845         retval = usb_register(&io_driver);
2846
2847         if (retval)
2848                 goto failed_usb_register;
2849
2850         if (retval == 0) {
2851                 dbg("%s\n", "Leaving...");
2852                 return 0;
2853         }
2854
2855       failed_usb_register:
2856         usb_serial_deregister(&moschip7840_4port_device);
2857
2858       failed_port_device_register:
2859
2860         return retval;
2861 }
2862
2863 /****************************************************************************
2864  * moschip7840_exit
2865  *      Called when the driver is about to be unloaded.
2866  ****************************************************************************/
2867 static void __exit moschip7840_exit(void)
2868 {
2869
2870         dbg("%s \n", " mos7840_exit :entering..........");
2871
2872         usb_deregister(&io_driver);
2873
2874         usb_serial_deregister(&moschip7840_4port_device);
2875
2876         dbg("%s\n", "Entring...");
2877 }
2878
2879 module_init(moschip7840_init);
2880 module_exit(moschip7840_exit);
2881
2882 /* Module information */
2883 MODULE_DESCRIPTION(DRIVER_DESC);
2884 MODULE_LICENSE("GPL");
2885
2886 module_param(debug, bool, S_IRUGO | S_IWUSR);
2887 MODULE_PARM_DESC(debug, "Debug enabled or not");