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 <linux/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
 273            to be Or'ed */
 274         if (port->serial->num_ports == 4) {
 275                 val |= (((__u16) port->number -
 276                                 (__u16) (port->serial->minor)) + 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 |= (((__u16) port->number -
 281                               (__u16) (port->serial->minor)) + 1) << 8;
 282                         dbg("mos7840_set_uart_reg application number is %x\n",
 283                             val);
 284                 } else {
 285                         val |=
 286                             (((__u16) port->number -
 287                               (__u16) (port->serial->minor)) + 2) << 8;
 288                         dbg("mos7840_set_uart_reg application number is %x\n",
 289                             val);
 290                 }
 291         }
 292         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 293                                MCS_WR_RTYPE, val, reg, NULL, 0,
 294                                MOS_WDR_TIMEOUT);
 295
 296 }
 297
 298 /*
 299  * mos7840_get_uart_reg
 300  *      To set the Control register by calling usb_fill_control_urb function
 301  *      by passing usb_rcvctrlpipe function as parameter.
 302  */
 303 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 304                                 __u16 *val)
 305 {
 306         struct usb_device *dev = port->serial->dev;
 307         int ret = 0;
 308         __u16 Wval;
 309
 310         /* dbg("application number is %4x \n",
 311             (((__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 = (((__u16) port->number -
 321                               (__u16) (port->serial->minor)) + 1) << 8;
 322                         dbg("mos7840_get_uart_reg application number is %x\n",
 323                             Wval);
 324                 } else {
 325                         Wval = (((__u16) port->number -
 326                               (__u16) (port->serial->minor)) + 2) << 8;
 327                         dbg("mos7840_get_uart_reg application number is %x\n",
 328                             Wval);
 329                 }
 330         }
 331         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 332                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 333                               MOS_WDR_TIMEOUT);
 334         *val = (*val) & 0x00ff;
 335         return ret;
 336 }
 337
 338 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 339 {
 340
 341         dbg("***************************************\n");
 342         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 343         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 344         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 345         dbg("***************************************\n");
 346
 347 }
 348
 349 /************************************************************************/
 350 /************************************************************************/
 351 /*             I N T E R F A C E   F U N C T I O N S                    */
 352 /*             I N T E R F A C E   F U N C T I O N S                    */
 353 /************************************************************************/
 354 /************************************************************************/
 355
 356 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 357                                             struct moschip_port *data)
 358 {
 359         usb_set_serial_port_data(port, (void *)data);
 360 }
 361
 362 static inline struct moschip_port *mos7840_get_port_private(struct
 363                                                             usb_serial_port
 364                                                             *port)
 365 {
 366         return (struct moschip_port *)usb_get_serial_port_data(port);
 367 }
 368
 369 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 370 {
 371         struct moschip_port *mos7840_port;
 372         struct async_icount *icount;
 373         mos7840_port = port;
 374         icount = &mos7840_port->icount;
 375         if (new_msr &
 376             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 377              MOS_MSR_DELTA_CD)) {
 378                 icount = &mos7840_port->icount;
 379
 380                 /* update input line counters */
 381                 if (new_msr & MOS_MSR_DELTA_CTS) {
 382                         icount->cts++;
 383                         smp_wmb();
 384                 }
 385                 if (new_msr & MOS_MSR_DELTA_DSR) {
 386                         icount->dsr++;
 387                         smp_wmb();
 388                 }
 389                 if (new_msr & MOS_MSR_DELTA_CD) {
 390                         icount->dcd++;
 391                         smp_wmb();
 392                 }
 393                 if (new_msr & MOS_MSR_DELTA_RI) {
 394                         icount->rng++;
 395                         smp_wmb();
 396                 }
 397         }
 398 }
 399
 400 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 401 {
 402         struct async_icount *icount;
 403
 404         dbg("%s - %02x", __func__, new_lsr);
 405
 406         if (new_lsr & SERIAL_LSR_BI) {
 407                 /*
 408                  * Parity and Framing errors only count if they
 409                  * occur exclusive of a break being
 410                  * received.
 411                  */
 412                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 413         }
 414
 415         /* update input line counters */
 416         icount = &port->icount;
 417         if (new_lsr & SERIAL_LSR_BI) {
 418                 icount->brk++;
 419                 smp_wmb();
 420         }
 421         if (new_lsr & SERIAL_LSR_OE) {
 422                 icount->overrun++;
 423                 smp_wmb();
 424         }
 425         if (new_lsr & SERIAL_LSR_PE) {
 426                 icount->parity++;
 427                 smp_wmb();
 428         }
 429         if (new_lsr & SERIAL_LSR_FE) {
 430                 icount->frame++;
 431                 smp_wmb();
 432         }
 433 }
 434
 435 /************************************************************************/
 436 /************************************************************************/
 437 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 438 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 439 /************************************************************************/
 440 /************************************************************************/
 441
 442 static void mos7840_control_callback(struct urb *urb)
 443 {
 444         unsigned char *data;
 445         struct moschip_port *mos7840_port;
 446         __u8 regval = 0x0;
 447         int result = 0;
 448         int status = urb->status;
 449
 450         mos7840_port = urb->context;
 451
 452         switch (status) {
 453         case 0:
 454                 /* success */
 455                 break;
 456         case -ECONNRESET:
 457         case -ENOENT:
 458         case -ESHUTDOWN:
 459                 /* this urb is terminated, clean up */
 460                 dbg("%s - urb shutting down with status: %d", __func__,
 461                     status);
 462                 return;
 463         default:
 464                 dbg("%s - nonzero urb status received: %d", __func__,
 465                     status);
 466                 goto exit;
 467         }
 468
 469         dbg("%s urb buffer size is %d\n", __func__, urb->actual_length);
 470         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 471             mos7840_port->MsrLsr, mos7840_port->port_num);
 472         data = urb->transfer_buffer;
 473         regval = (__u8) data[0];
 474         dbg("%s data is %x\n", __func__, regval);
 475         if (mos7840_port->MsrLsr == 0)
 476                 mos7840_handle_new_msr(mos7840_port, regval);
 477         else if (mos7840_port->MsrLsr == 1)
 478                 mos7840_handle_new_lsr(mos7840_port, regval);
 479
 480 exit:
 481         spin_lock(&mos7840_port->pool_lock);
 482         if (!mos7840_port->zombie)
 483                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 484         spin_unlock(&mos7840_port->pool_lock);
 485         if (result) {
 486                 dev_err(&urb->dev->dev,
 487                         "%s - Error %d submitting interrupt urb\n",
 488                         __func__, result);
 489         }
 490 }
 491
 492 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 493                            __u16 *val)
 494 {
 495         struct usb_device *dev = mcs->port->serial->dev;
 496         struct usb_ctrlrequest *dr = mcs->dr;
 497         unsigned char *buffer = mcs->ctrl_buf;
 498         int ret;
 499
 500         dr->bRequestType = MCS_RD_RTYPE;
 501         dr->bRequest = MCS_RDREQ;
 502         dr->wValue = cpu_to_le16(Wval); /* 0 */
 503         dr->wIndex = cpu_to_le16(reg);
 504         dr->wLength = cpu_to_le16(2);
 505
 506         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 507                              (unsigned char *)dr, buffer, 2,
 508                              mos7840_control_callback, mcs);
 509         mcs->control_urb->transfer_buffer_length = 2;
 510         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 511         return ret;
 512 }
 513
 514 /*****************************************************************************
 515  * mos7840_interrupt_callback
 516  *      this is the callback function for when we have received data on the
 517  *      interrupt endpoint.
 518  *****************************************************************************/
 519
 520 static void mos7840_interrupt_callback(struct urb *urb)
 521 {
 522         int result;
 523         int length;
 524         struct moschip_port *mos7840_port;
 525         struct usb_serial *serial;
 526         __u16 Data;
 527         unsigned char *data;
 528         __u8 sp[5], st;
 529         int i, rv = 0;
 530         __u16 wval, wreg = 0;
 531         int status = urb->status;
 532
 533         dbg("%s", " : Entering\n");
 534
 535         switch (status) {
 536         case 0:
 537                 /* success */
 538                 break;
 539         case -ECONNRESET:
 540         case -ENOENT:
 541         case -ESHUTDOWN:
 542                 /* this urb is terminated, clean up */
 543                 dbg("%s - urb shutting down with status: %d", __func__,
 544                     status);
 545                 return;
 546         default:
 547                 dbg("%s - nonzero urb status received: %d", __func__,
 548                     status);
 549                 goto exit;
 550         }
 551
 552         length = urb->actual_length;
 553         data = urb->transfer_buffer;
 554
 555         serial = urb->context;
 556
 557         /* Moschip get 5 bytes
 558          * Byte 1 IIR Port 1 (port.number is 0)
 559          * Byte 2 IIR Port 2 (port.number is 1)
 560          * Byte 3 IIR Port 3 (port.number is 2)
 561          * Byte 4 IIR Port 4 (port.number is 3)
 562          * Byte 5 FIFO status for both */
 563
 564         if (length && length > 5) {
 565                 dbg("%s \n", "Wrong data !!!");
 566                 return;
 567         }
 568
 569         sp[0] = (__u8) data[0];
 570         sp[1] = (__u8) data[1];
 571         sp[2] = (__u8) data[2];
 572         sp[3] = (__u8) data[3];
 573         st = (__u8) data[4];
 574
 575         for (i = 0; i < serial->num_ports; i++) {
 576                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 577                 wval =
 578                     (((__u16) serial->port[i]->number -
 579                       (__u16) (serial->minor)) + 1) << 8;
 580                 if (mos7840_port->open) {
 581                         if (sp[i] & 0x01) {
 582                                 dbg("SP%d No Interrupt !!!\n", i);
 583                         } else {
 584                                 switch (sp[i] & 0x0f) {
 585                                 case SERIAL_IIR_RLS:
 586                                         dbg("Serial Port %d: Receiver status error or ", i);
 587                                         dbg("address bit detected in 9-bit mode\n");
 588                                         mos7840_port->MsrLsr = 1;
 589                                         wreg = LINE_STATUS_REGISTER;
 590                                         break;
 591                                 case SERIAL_IIR_MS:
 592                                         dbg("Serial Port %d: Modem status change\n", i);
 593                                         mos7840_port->MsrLsr = 0;
 594                                         wreg = MODEM_STATUS_REGISTER;
 595                                         break;
 596                                 }
 597                                 spin_lock(&mos7840_port->pool_lock);
 598                                 if (!mos7840_port->zombie) {
 599                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 600                                 } else {
 601                                         spin_unlock(&mos7840_port->pool_lock);
 602                                         return;
 603                                 }
 604                                 spin_unlock(&mos7840_port->pool_lock);
 605                         }
 606                 }
 607         }
 608         if (!(rv < 0))
 609                 /* the completion handler for the control urb will resubmit */
 610                 return;
 611 exit:
 612         result = usb_submit_urb(urb, GFP_ATOMIC);
 613         if (result) {
 614                 dev_err(&urb->dev->dev,
 615                         "%s - Error %d submitting interrupt urb\n",
 616                         __func__, result);
 617         }
 618 }
 619
 620 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 621                                        const char *function)
 622 {
 623         if (!port) {
 624                 dbg("%s - port == NULL", function);
 625                 return -1;
 626         }
 627         if (!port->serial) {
 628                 dbg("%s - port->serial == NULL", function);
 629                 return -1;
 630         }
 631
 632         return 0;
 633 }
 634
 635 /* Inline functions to check the sanity of a pointer that is passed to us */
 636 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 637                                          const char *function)
 638 {
 639         if (!serial) {
 640                 dbg("%s - serial == NULL", function);
 641                 return -1;
 642         }
 643         if (!serial->type) {
 644                 dbg("%s - serial->type == NULL!", function);
 645                 return -1;
 646         }
 647
 648         return 0;
 649 }
 650
 651 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 652                                                  const char *function)
 653 {
 654         /* if no port was specified, or it fails a paranoia check */
 655         if (!port ||
 656             mos7840_port_paranoia_check(port, function) ||
 657             mos7840_serial_paranoia_check(port->serial, function)) {
 658                 /* then say that we don't have a valid usb_serial thing,
 659                  * which will end up genrating -ENODEV return values */
 660                 return NULL;
 661         }
 662
 663         return port->serial;
 664 }
 665
 666 /*****************************************************************************
 667  * mos7840_bulk_in_callback
 668  *      this is the callback function for when we have received data on the
 669  *      bulk in endpoint.
 670  *****************************************************************************/
 671
 672 static void mos7840_bulk_in_callback(struct urb *urb)
 673 {
 674         int retval;
 675         unsigned char *data;
 676         struct usb_serial *serial;
 677         struct usb_serial_port *port;
 678         struct moschip_port *mos7840_port;
 679         struct tty_struct *tty;
 680         int status = urb->status;
 681
 682         if (status) {
 683                 dbg("nonzero read bulk status received: %d", status);
 684                 return;
 685         }
 686
 687         mos7840_port = urb->context;
 688         if (!mos7840_port) {
 689                 dbg("%s", "NULL mos7840_port pointer \n");
 690                 return;
 691         }
 692
 693         port = (struct usb_serial_port *)mos7840_port->port;
 694         if (mos7840_port_paranoia_check(port, __func__)) {
 695                 dbg("%s", "Port Paranoia failed \n");
 696                 return;
 697         }
 698
 699         serial = mos7840_get_usb_serial(port, __func__);
 700         if (!serial) {
 701                 dbg("%s\n", "Bad serial pointer ");
 702                 return;
 703         }
 704
 705         dbg("%s\n", "Entering... \n");
 706
 707         data = urb->transfer_buffer;
 708
 709         dbg("%s", "Entering ........... \n");
 710
 711         if (urb->actual_length) {
 712                 tty = mos7840_port->port->port.tty;
 713                 if (tty) {
 714                         tty_buffer_request_room(tty, urb->actual_length);
 715                         tty_insert_flip_string(tty, data, urb->actual_length);
 716                         dbg(" %s \n", data);
 717                         tty_flip_buffer_push(tty);
 718                 }
 719                 mos7840_port->icount.rx += urb->actual_length;
 720                 smp_wmb();
 721                 dbg("mos7840_port->icount.rx is %d:\n",
 722                     mos7840_port->icount.rx);
 723         }
 724
 725         if (!mos7840_port->read_urb) {
 726                 dbg("%s", "URB KILLED !!!\n");
 727                 return;
 728         }
 729
 730
 731         mos7840_port->read_urb->dev = serial->dev;
 732
 733         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 734
 735         if (retval) {
 736                 dbg(" usb_submit_urb(read bulk) failed, retval = %d",
 737                  retval);
 738         }
 739 }
 740
 741 /*****************************************************************************
 742  * mos7840_bulk_out_data_callback
 743  *      this is the callback function for when we have finished sending
 744  *      serial data on the bulk out endpoint.
 745  *****************************************************************************/
 746
 747 static void mos7840_bulk_out_data_callback(struct urb *urb)
 748 {
 749         struct moschip_port *mos7840_port;
 750         struct tty_struct *tty;
 751         int status = urb->status;
 752         int i;
 753
 754         mos7840_port = urb->context;
 755         spin_lock(&mos7840_port->pool_lock);
 756         for (i = 0; i < NUM_URBS; i++) {
 757                 if (urb == mos7840_port->write_urb_pool[i]) {
 758                         mos7840_port->busy[i] = 0;
 759                         break;
 760                 }
 761         }
 762         spin_unlock(&mos7840_port->pool_lock);
 763
 764         if (status) {
 765                 dbg("nonzero write bulk status received:%d\n", status);
 766                 return;
 767         }
 768
 769         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 770                 dbg("%s", "Port Paranoia failed \n");
 771                 return;
 772         }
 773
 774         dbg("%s \n", "Entering .........");
 775
 776         tty = mos7840_port->port->port.tty;
 777
 778         if (tty && mos7840_port->open)
 779                 tty_wakeup(tty);
 780
 781 }
 782
 783 /************************************************************************/
 784 /*       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       */
 785 /************************************************************************/
 786 #ifdef MCSSerialProbe
 787 static int mos7840_serial_probe(struct usb_serial *serial,
 788                                 const struct usb_device_id *id)
 789 {
 790
 791         /*need to implement the mode_reg reading and updating\
 792            structures usb_serial_ device_type\
 793            (i.e num_ports, num_bulkin,bulkout etc) */
 794         /* Also we can update the changes  attach */
 795         return 1;
 796 }
 797 #endif
 798
 799 /*****************************************************************************
 800  * mos7840_open
 801  *      this function is called by the tty driver when a port is opened
 802  *      If successful, we return 0
 803  *      Otherwise we return a negative error number.
 804  *****************************************************************************/
 805
 806 static int mos7840_open(struct tty_struct *tty,
 807                         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,
 851                                                                 GFP_KERNEL);
 852                 if (!urb->transfer_buffer) {
 853                         usb_free_urb(urb);
 854                         mos7840_port->write_urb_pool[j] = NULL;
 855                         err("%s-out of memory for urb buffers.", __func__);
 856                         continue;
 857                 }
 858         }
 859
 860 /*****************************************************************************
 861  * Initialize MCS7840 -- Write Init values to corresponding Registers
 862  *
 863  * Register Index
 864  * 1 : IER
 865  * 2 : FCR
 866  * 3 : LCR
 867  * 4 : MCR
 868  *
 869  * 0x08 : SP1/2 Control Reg
 870  *****************************************************************************/
 871
 872         /* NEED to check the following Block */
 873
 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         Data = 0x0;
 896         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 897                                                                         &Data);
 898         if (status < 0) {
 899                 dbg("Reading Controlreg failed\n");
 900                 return -1;
 901         }
 902         Data |= 0x08;           /* Driver done bit */
 903         Data |= 0x20;           /* rx_disable */
 904         status = mos7840_set_reg_sync(port,
 905                                 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         Data = 0x00;
 916         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 917         if (status < 0) {
 918                 dbg("disableing interrupts failed\n");
 919                 return -1;
 920         }
 921         /* Set FIFO_CONTROL_REGISTER to the default value */
 922         Data = 0x00;
 923         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 924         if (status < 0) {
 925                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 926                 return -1;
 927         }
 928
 929         Data = 0xcf;
 930         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 931         if (status < 0) {
 932                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 933                 return -1;
 934         }
 935
 936         Data = 0x03;
 937         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 938         mos7840_port->shadowLCR = Data;
 939
 940         Data = 0x0b;
 941         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 942         mos7840_port->shadowMCR = Data;
 943
 944         Data = 0x00;
 945         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 946         mos7840_port->shadowLCR = Data;
 947
 948         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 949         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 950
 951         Data = 0x0c;
 952         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 953
 954         Data = 0x0;
 955         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 956
 957         Data = 0x00;
 958         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 959
 960         Data = Data & ~SERIAL_LCR_DLAB;
 961         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 962         mos7840_port->shadowLCR = Data;
 963
 964         /* clearing Bulkin and Bulkout Fifo */
 965         Data = 0x0;
 966         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 967
 968         Data = Data | 0x0c;
 969         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 970
 971         Data = Data & ~0x0c;
 972         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 973         /* Finally enable all interrupts */
 974         Data = 0x0c;
 975         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 976
 977         /* clearing rx_disable */
 978         Data = 0x0;
 979         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 980                                                                         &Data);
 981         Data = Data & ~0x20;
 982         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
 983                                                                         Data);
 984
 985         /* rx_negate */
 986         Data = 0x0;
 987         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 988                                                                         &Data);
 989         Data = Data | 0x10;
 990         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
 991                                                                         Data);
 992
 993         /* force low_latency on so that our tty_push actually forces *
 994          * the data through,otherwise it is scheduled, and with      *
 995          * high data rates (like with OHCI) data can get lost.       */
 996         if (tty)
 997                 tty->low_latency = 1;
 998
 999         /* Check to see if we've set up our endpoint info yet    *
1000          * (can't set it up in mos7840_startup as the structures *
1001          * were not set up at that time.)                        */
1002         if (port0->open_ports == 1) {
1003                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1004                         /* set up interrupt urb */
1005                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1006                                 serial->dev,
1007                                 usb_rcvintpipe(serial->dev,
1008                                 serial->port[0]->interrupt_in_endpointAddress),
1009                                 serial->port[0]->interrupt_in_buffer,
1010                                 serial->port[0]->interrupt_in_urb->
1011                                 transfer_buffer_length,
1012                                 mos7840_interrupt_callback,
1013                                 serial,
1014                                 serial->port[0]->interrupt_in_urb->interval);
1015
1016                         /* start interrupt read for mos7840               *
1017                          * will continue as long as mos7840 is connected  */
1018
1019                         response =
1020                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1021                                            GFP_KERNEL);
1022                         if (response) {
1023                                 err("%s - Error %d submitting interrupt urb",
1024                                     __func__, response);
1025                         }
1026
1027                 }
1028
1029         }
1030
1031         /* see if we've set up our endpoint info yet   *
1032          * (can't set it up in mos7840_startup as the  *
1033          * structures were not set up at that time.)   */
1034
1035         dbg("port number is %d \n", port->number);
1036         dbg("serial number is %d \n", port->serial->minor);
1037         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1038         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1039         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1040         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1041         mos7840_port->read_urb = port->read_urb;
1042
1043         /* set up our bulk in urb */
1044
1045         usb_fill_bulk_urb(mos7840_port->read_urb,
1046                           serial->dev,
1047                           usb_rcvbulkpipe(serial->dev,
1048                                           port->bulk_in_endpointAddress),
1049                           port->bulk_in_buffer,
1050                           mos7840_port->read_urb->transfer_buffer_length,
1051                           mos7840_bulk_in_callback, mos7840_port);
1052
1053         dbg("mos7840_open: bulkin endpoint is %d\n",
1054             port->bulk_in_endpointAddress);
1055         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1056         if (response) {
1057                 err("%s - Error %d submitting control urb", __func__,
1058                     response);
1059         }
1060
1061         /* initialize our wait queues */
1062         init_waitqueue_head(&mos7840_port->wait_chase);
1063         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1064
1065         /* initialize our icount structure */
1066         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1067
1068         /* initialize our port settings */
1069         /* Must set to enable ints! */
1070         mos7840_port->shadowMCR = MCR_MASTER_IE;
1071         /* send a open port command */
1072         mos7840_port->open = 1;
1073         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1074         mos7840_port->icount.tx = 0;
1075         mos7840_port->icount.rx = 0;
1076
1077         dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n",
1078                                 serial, mos7840_port, port);
1079
1080         return 0;
1081
1082 }
1083
1084 /*****************************************************************************
1085  * mos7840_chars_in_buffer
1086  *      this function is called by the tty driver when it wants to know how many
1087  *      bytes of data we currently have outstanding in the port (data that has
1088  *      been written, but hasn't made it out the port yet)
1089  *      If successful, we return the number of bytes left to be written in the
1090  *      system,
1091  *      Otherwise we return zero.
1092  *****************************************************************************/
1093
1094 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1095 {
1096         struct usb_serial_port *port = tty->driver_data;
1097         int i;
1098         int chars = 0;
1099         unsigned long flags;
1100         struct moschip_port *mos7840_port;
1101
1102         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1103
1104         if (mos7840_port_paranoia_check(port, __func__)) {
1105                 dbg("%s", "Invalid port \n");
1106                 return 0;
1107         }
1108
1109         mos7840_port = mos7840_get_port_private(port);
1110         if (mos7840_port == NULL) {
1111                 dbg("%s \n", "mos7840_break:leaving ...........");
1112                 return 0;
1113         }
1114
1115         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1116         for (i = 0; i < NUM_URBS; ++i)
1117                 if (mos7840_port->busy[i])
1118                         chars += URB_TRANSFER_BUFFER_SIZE;
1119         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1120         dbg("%s - returns %d", __func__, chars);
1121         return chars;
1122
1123 }
1124
1125 /************************************************************************
1126  *
1127  * mos7840_block_until_tx_empty
1128  *
1129  *      This function will block the close until one of the following:
1130  *              1. TX count are 0
1131  *              2. The mos7840 has stopped
1132  *              3. A timeout of 3 seconds without activity has expired
1133  *
1134  ************************************************************************/
1135 static void mos7840_block_until_tx_empty(struct tty_struct *tty,
1136                                 struct moschip_port *mos7840_port)
1137 {
1138         int timeout = HZ / 10;
1139         int wait = 30;
1140         int count;
1141
1142         while (1) {
1143
1144                 count = mos7840_chars_in_buffer(tty);
1145
1146                 /* Check for Buffer status */
1147                 if (count <= 0)
1148                         return;
1149
1150                 /* Block the thread for a while */
1151                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1152                                                timeout);
1153
1154                 /* No activity.. count down section */
1155                 wait--;
1156                 if (wait == 0) {
1157                         dbg("%s - TIMEOUT", __func__);
1158                         return;
1159                 } else {
1160                         /* Reset timeout value back to seconds */
1161                         wait = 30;
1162                 }
1163         }
1164 }
1165
1166 /*****************************************************************************
1167  * mos7840_close
1168  *      this function is called by the tty driver when a port is closed
1169  *****************************************************************************/
1170
1171 static void mos7840_close(struct tty_struct *tty,
1172                         struct usb_serial_port *port, struct file *filp)
1173 {
1174         struct usb_serial *serial;
1175         struct moschip_port *mos7840_port;
1176         struct moschip_port *port0;
1177         int j;
1178         __u16 Data;
1179
1180         dbg("%s\n", "mos7840_close:entering...");
1181
1182         if (mos7840_port_paranoia_check(port, __func__)) {
1183                 dbg("%s", "Port Paranoia failed \n");
1184                 return;
1185         }
1186
1187         serial = mos7840_get_usb_serial(port, __func__);
1188         if (!serial) {
1189                 dbg("%s", "Serial Paranoia failed \n");
1190                 return;
1191         }
1192
1193         mos7840_port = mos7840_get_port_private(port);
1194         port0 = mos7840_get_port_private(serial->port[0]);
1195
1196         if (mos7840_port == NULL || port0 == NULL)
1197                 return;
1198
1199         for (j = 0; j < NUM_URBS; ++j)
1200                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1201
1202         /* Freeing Write URBs */
1203         for (j = 0; j < NUM_URBS; ++j) {
1204                 if (mos7840_port->write_urb_pool[j]) {
1205                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1206                                 kfree(mos7840_port->write_urb_pool[j]->
1207                                       transfer_buffer);
1208
1209                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1210                 }
1211         }
1212
1213         if (serial->dev)
1214                 /* flush and block until tx is empty */
1215                 mos7840_block_until_tx_empty(tty, mos7840_port);
1216
1217         /* While closing port, shutdown all bulk read, write  *
1218          * and interrupt read if they exists                  */
1219         if (serial->dev) {
1220                 if (mos7840_port->write_urb) {
1221                         dbg("%s", "Shutdown bulk write\n");
1222                         usb_kill_urb(mos7840_port->write_urb);
1223                 }
1224                 if (mos7840_port->read_urb) {
1225                         dbg("%s", "Shutdown bulk read\n");
1226                         usb_kill_urb(mos7840_port->read_urb);
1227                 }
1228                 if ((&mos7840_port->control_urb)) {
1229                         dbg("%s", "Shutdown control read\n");
1230                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1231                 }
1232         }
1233 /*      if(mos7840_port->ctrl_buf != NULL) */
1234 /*              kfree(mos7840_port->ctrl_buf); */
1235         port0->open_ports--;
1236         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1237             port0->open_ports, port->number);
1238         if (port0->open_ports == 0) {
1239                 if (serial->port[0]->interrupt_in_urb) {
1240                         dbg("%s", "Shutdown interrupt_in_urb\n");
1241                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1242                 }
1243         }
1244
1245         if (mos7840_port->write_urb) {
1246                 /* if this urb had a transfer buffer already (old tx) free it */
1247                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1248                         kfree(mos7840_port->write_urb->transfer_buffer);
1249                 usb_free_urb(mos7840_port->write_urb);
1250         }
1251
1252         Data = 0x0;
1253         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1254
1255         Data = 0x00;
1256         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1257
1258         mos7840_port->open = 0;
1259
1260         dbg("%s \n", "Leaving ............");
1261 }
1262
1263 /************************************************************************
1264  *
1265  * mos7840_block_until_chase_response
1266  *
1267  *      This function will block the close until one of the following:
1268  *              1. Response to our Chase comes from mos7840
1269  *              2. A timeout of 10 seconds without activity has expired
1270  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1271  *
1272  ************************************************************************/
1273
1274 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1275                                         struct moschip_port *mos7840_port)
1276 {
1277         int timeout = 1 * HZ;
1278         int wait = 10;
1279         int count;
1280
1281         while (1) {
1282                 count = mos7840_chars_in_buffer(tty);
1283
1284                 /* Check for Buffer status */
1285                 if (count <= 0)
1286                         return;
1287
1288                 /* Block the thread for a while */
1289                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1290                                                timeout);
1291                 /* No activity.. count down section */
1292                 wait--;
1293                 if (wait == 0) {
1294                         dbg("%s - TIMEOUT", __func__);
1295                         return;
1296                 } else {
1297                         /* Reset timeout value back to seconds */
1298                         wait = 10;
1299                 }
1300         }
1301
1302 }
1303
1304 /*****************************************************************************
1305  * mos7840_break
1306  *      this function sends a break to the port
1307  *****************************************************************************/
1308 static void mos7840_break(struct tty_struct *tty, int break_state)
1309 {
1310         struct usb_serial_port *port = tty->driver_data;
1311         unsigned char data;
1312         struct usb_serial *serial;
1313         struct moschip_port *mos7840_port;
1314
1315         dbg("%s \n", "Entering ...........");
1316         dbg("mos7840_break: Start\n");
1317
1318         if (mos7840_port_paranoia_check(port, __func__)) {
1319                 dbg("%s", "Port Paranoia failed \n");
1320                 return;
1321         }
1322
1323         serial = mos7840_get_usb_serial(port, __func__);
1324         if (!serial) {
1325                 dbg("%s", "Serial Paranoia failed \n");
1326                 return;
1327         }
1328
1329         mos7840_port = mos7840_get_port_private(port);
1330
1331         if (mos7840_port == NULL)
1332                 return;
1333
1334         if (serial->dev)
1335                 /* flush and block until tx is empty */
1336                 mos7840_block_until_chase_response(tty, mos7840_port);
1337
1338         if (break_state == -1)
1339                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1340         else
1341                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1342
1343         mos7840_port->shadowLCR = data;
1344         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1345             mos7840_port->shadowLCR);
1346         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1347                              mos7840_port->shadowLCR);
1348
1349         return;
1350 }
1351
1352 /*****************************************************************************
1353  * mos7840_write_room
1354  *      this function is called by the tty driver when it wants to know how many
1355  *      bytes of data we can accept for a specific port.
1356  *      If successful, we return the amount of room that we have for this port
1357  *      Otherwise we return a negative error number.
1358  *****************************************************************************/
1359
1360 static int mos7840_write_room(struct tty_struct *tty)
1361 {
1362         struct usb_serial_port *port = tty->driver_data;
1363         int i;
1364         int room = 0;
1365         unsigned long flags;
1366         struct moschip_port *mos7840_port;
1367
1368         dbg("%s \n", " mos7840_write_room:entering ...........");
1369
1370         if (mos7840_port_paranoia_check(port, __func__)) {
1371                 dbg("%s", "Invalid port \n");
1372                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1373                 return -1;
1374         }
1375
1376         mos7840_port = mos7840_get_port_private(port);
1377         if (mos7840_port == NULL) {
1378                 dbg("%s \n", "mos7840_break:leaving ...........");
1379                 return -1;
1380         }
1381
1382         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1383         for (i = 0; i < NUM_URBS; ++i) {
1384                 if (!mos7840_port->busy[i])
1385                         room += URB_TRANSFER_BUFFER_SIZE;
1386         }
1387         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1388
1389         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1390         dbg("%s - returns %d", __func__, room);
1391         return room;
1392
1393 }
1394
1395 /*****************************************************************************
1396  * mos7840_write
1397  *      this function is called by the tty driver when data should be written to
1398  *      the port.
1399  *      If successful, we return the number of bytes written, otherwise we
1400  *      return a negative error number.
1401  *****************************************************************************/
1402
1403 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1404                          const unsigned char *data, int count)
1405 {
1406         int status;
1407         int i;
1408         int bytes_sent = 0;
1409         int transfer_size;
1410         unsigned long flags;
1411
1412         struct moschip_port *mos7840_port;
1413         struct usb_serial *serial;
1414         struct urb *urb;
1415         /* __u16 Data; */
1416         const unsigned char *current_position = data;
1417         unsigned char *data1;
1418         dbg("%s \n", "entering ...........");
1419         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1420                                         mos7840_port->shadowLCR); */
1421
1422 #ifdef NOTMOS7840
1423         Data = 0x00;
1424         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1425         mos7840_port->shadowLCR = Data;
1426         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1427         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1428             mos7840_port->shadowLCR);
1429
1430         /* Data = 0x03; */
1431         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1432         /* mos7840_port->shadowLCR=Data;//Need to add later */
1433
1434         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1435         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1436
1437         /* Data = 0x0c; */
1438         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1439         Data = 0x00;
1440         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1441         dbg("mos7840_write:DLL value is %x\n", Data);
1442
1443         Data = 0x0;
1444         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1445         dbg("mos7840_write:DLM value is %x\n", Data);
1446
1447         Data = Data & ~SERIAL_LCR_DLAB;
1448         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1449             mos7840_port->shadowLCR);
1450         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1451 #endif
1452
1453         if (mos7840_port_paranoia_check(port, __func__)) {
1454                 dbg("%s", "Port Paranoia failed \n");
1455                 return -1;
1456         }
1457
1458         serial = port->serial;
1459         if (mos7840_serial_paranoia_check(serial, __func__)) {
1460                 dbg("%s", "Serial Paranoia failed \n");
1461                 return -1;
1462         }
1463
1464         mos7840_port = mos7840_get_port_private(port);
1465         if (mos7840_port == NULL) {
1466                 dbg("%s", "mos7840_port is NULL\n");
1467                 return -1;
1468         }
1469
1470         /* try to find a free urb in the list */
1471         urb = NULL;
1472
1473         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1474         for (i = 0; i < NUM_URBS; ++i) {
1475                 if (!mos7840_port->busy[i]) {
1476                         mos7840_port->busy[i] = 1;
1477                         urb = mos7840_port->write_urb_pool[i];
1478                         dbg("\nURB:%d", i);
1479                         break;
1480                 }
1481         }
1482         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1483
1484         if (urb == NULL) {
1485                 dbg("%s - no more free urbs", __func__);
1486                 goto exit;
1487         }
1488
1489         if (urb->transfer_buffer == NULL) {
1490                 urb->transfer_buffer =
1491                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1492
1493                 if (urb->transfer_buffer == NULL) {
1494                         err("%s no more kernel memory...", __func__);
1495                         goto exit;
1496                 }
1497         }
1498         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1499
1500         memcpy(urb->transfer_buffer, current_position, transfer_size);
1501
1502         /* fill urb with data and submit  */
1503         usb_fill_bulk_urb(urb,
1504                           serial->dev,
1505                           usb_sndbulkpipe(serial->dev,
1506                                           port->bulk_out_endpointAddress),
1507                           urb->transfer_buffer,
1508                           transfer_size,
1509                           mos7840_bulk_out_data_callback, mos7840_port);
1510
1511         data1 = urb->transfer_buffer;
1512         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1513
1514         /* send it down the pipe */
1515         status = usb_submit_urb(urb, GFP_ATOMIC);
1516
1517         if (status) {
1518                 mos7840_port->busy[i] = 0;
1519                 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1520                     __func__, status);
1521                 bytes_sent = status;
1522                 goto exit;
1523         }
1524         bytes_sent = transfer_size;
1525         mos7840_port->icount.tx += transfer_size;
1526         smp_wmb();
1527         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1528 exit:
1529         return bytes_sent;
1530
1531 }
1532
1533 /*****************************************************************************
1534  * mos7840_throttle
1535  *      this function is called by the tty driver when it wants to stop the data
1536  *      being read from the port.
1537  *****************************************************************************/
1538
1539 static void mos7840_throttle(struct tty_struct *tty)
1540 {
1541         struct usb_serial_port *port = tty->driver_data;
1542         struct moschip_port *mos7840_port;
1543         int status;
1544
1545         if (mos7840_port_paranoia_check(port, __func__)) {
1546                 dbg("%s", "Invalid port \n");
1547                 return;
1548         }
1549
1550         dbg("- port %d\n", port->number);
1551
1552         mos7840_port = mos7840_get_port_private(port);
1553
1554         if (mos7840_port == NULL)
1555                 return;
1556
1557         if (!mos7840_port->open) {
1558                 dbg("%s\n", "port not opened");
1559                 return;
1560         }
1561
1562         dbg("%s", "Entering .......... \n");
1563
1564         /* if we are implementing XON/XOFF, send the stop character */
1565         if (I_IXOFF(tty)) {
1566                 unsigned char stop_char = STOP_CHAR(tty);
1567                 status = mos7840_write(tty, port, &stop_char, 1);
1568                 if (status <= 0)
1569                         return;
1570         }
1571         /* if we are implementing RTS/CTS, toggle that line */
1572         if (tty->termios->c_cflag & CRTSCTS) {
1573                 mos7840_port->shadowMCR &= ~MCR_RTS;
1574                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1575                                          mos7840_port->shadowMCR);
1576                 if (status < 0)
1577                         return;
1578         }
1579
1580         return;
1581 }
1582
1583 /*****************************************************************************
1584  * mos7840_unthrottle
1585  *      this function is called by the tty driver when it wants to resume
1586  *      the data being read from the port (called after mos7840_throttle is
1587  *      called)
1588  *****************************************************************************/
1589 static void mos7840_unthrottle(struct tty_struct *tty)
1590 {
1591         struct usb_serial_port *port = tty->driver_data;
1592         int status;
1593         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1594
1595         if (mos7840_port_paranoia_check(port, __func__)) {
1596                 dbg("%s", "Invalid port \n");
1597                 return;
1598         }
1599
1600         if (mos7840_port == NULL)
1601                 return;
1602
1603         if (!mos7840_port->open) {
1604                 dbg("%s - port not opened", __func__);
1605                 return;
1606         }
1607
1608         dbg("%s", "Entering .......... \n");
1609
1610         /* if we are implementing XON/XOFF, send the start character */
1611         if (I_IXOFF(tty)) {
1612                 unsigned char start_char = START_CHAR(tty);
1613                 status = mos7840_write(tty, port, &start_char, 1);
1614                 if (status <= 0)
1615                         return;
1616         }
1617
1618         /* if we are implementing RTS/CTS, toggle that line */
1619         if (tty->termios->c_cflag & CRTSCTS) {
1620                 mos7840_port->shadowMCR |= MCR_RTS;
1621                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1622                                          mos7840_port->shadowMCR);
1623                 if (status < 0)
1624                         return;
1625         }
1626 }
1627
1628 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1629 {
1630         struct usb_serial_port *port = tty->driver_data;
1631         struct moschip_port *mos7840_port;
1632         unsigned int result;
1633         __u16 msr;
1634         __u16 mcr;
1635         int status;
1636         mos7840_port = mos7840_get_port_private(port);
1637
1638         dbg("%s - port %d", __func__, port->number);
1639
1640         if (mos7840_port == NULL)
1641                 return -ENODEV;
1642
1643         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1644         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1645         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1646             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1647             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1648             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1649             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1650             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1651             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1652
1653         dbg("%s - 0x%04X", __func__, result);
1654
1655         return result;
1656 }
1657
1658 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1659                             unsigned int set, unsigned int clear)
1660 {
1661         struct usb_serial_port *port = tty->driver_data;
1662         struct moschip_port *mos7840_port;
1663         unsigned int mcr;
1664         int status;
1665
1666         dbg("%s - port %d", __func__, port->number);
1667
1668         mos7840_port = mos7840_get_port_private(port);
1669
1670         if (mos7840_port == NULL)
1671                 return -ENODEV;
1672
1673         /* FIXME: What locks the port registers ? */
1674         mcr = mos7840_port->shadowMCR;
1675         if (clear & TIOCM_RTS)
1676                 mcr &= ~MCR_RTS;
1677         if (clear & TIOCM_DTR)
1678                 mcr &= ~MCR_DTR;
1679         if (clear & TIOCM_LOOP)
1680                 mcr &= ~MCR_LOOPBACK;
1681
1682         if (set & TIOCM_RTS)
1683                 mcr |= MCR_RTS;
1684         if (set & TIOCM_DTR)
1685                 mcr |= MCR_DTR;
1686         if (set & TIOCM_LOOP)
1687                 mcr |= MCR_LOOPBACK;
1688
1689         mos7840_port->shadowMCR = mcr;
1690
1691         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1692         if (status < 0) {
1693                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1694                 return status;
1695         }
1696
1697         return 0;
1698 }
1699
1700 /*****************************************************************************
1701  * mos7840_calc_baud_rate_divisor
1702  *      this function calculates the proper baud rate divisor for the specified
1703  *      baud rate.
1704  *****************************************************************************/
1705 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1706                                           __u16 *clk_sel_val)
1707 {
1708
1709         dbg("%s - %d", __func__, baudRate);
1710
1711         if (baudRate <= 115200) {
1712                 *divisor = 115200 / baudRate;
1713                 *clk_sel_val = 0x0;
1714         }
1715         if ((baudRate > 115200) && (baudRate <= 230400)) {
1716                 *divisor = 230400 / baudRate;
1717                 *clk_sel_val = 0x10;
1718         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1719                 *divisor = 403200 / baudRate;
1720                 *clk_sel_val = 0x20;
1721         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1722                 *divisor = 460800 / baudRate;
1723                 *clk_sel_val = 0x30;
1724         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1725                 *divisor = 806400 / baudRate;
1726                 *clk_sel_val = 0x40;
1727         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1728                 *divisor = 921600 / baudRate;
1729                 *clk_sel_val = 0x50;
1730         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1731                 *divisor = 1572864 / baudRate;
1732                 *clk_sel_val = 0x60;
1733         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1734                 *divisor = 3145728 / baudRate;
1735                 *clk_sel_val = 0x70;
1736         }
1737         return 0;
1738
1739 #ifdef NOTMCS7840
1740
1741         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1742                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1743                         *divisor = mos7840_divisor_table[i].Divisor;
1744                         return 0;
1745                 }
1746         }
1747
1748         /* After trying for all the standard baud rates    *
1749          * Try calculating the divisor for this baud rate  */
1750
1751         if (baudrate > 75 && baudrate < 230400) {
1752                 /* get the divisor */
1753                 custom = (__u16) (230400L / baudrate);
1754
1755                 /* Check for round off */
1756                 round1 = (__u16) (2304000L / baudrate);
1757                 round = (__u16) (round1 - (custom * 10));
1758                 if (round > 4)
1759                         custom++;
1760                 *divisor = custom;
1761
1762                 dbg(" Baud %d = %d\n", baudrate, custom);
1763                 return 0;
1764         }
1765
1766         dbg("%s\n", " Baud calculation Failed...");
1767         return -1;
1768 #endif
1769 }
1770
1771 /*****************************************************************************
1772  * mos7840_send_cmd_write_baud_rate
1773  *      this function sends the proper command to change the baud rate of the
1774  *      specified port.
1775  *****************************************************************************/
1776
1777 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1778                                             int baudRate)
1779 {
1780         int divisor = 0;
1781         int status;
1782         __u16 Data;
1783         unsigned char number;
1784         __u16 clk_sel_val;
1785         struct usb_serial_port *port;
1786
1787         if (mos7840_port == NULL)
1788                 return -1;
1789
1790         port = (struct usb_serial_port *)mos7840_port->port;
1791         if (mos7840_port_paranoia_check(port, __func__)) {
1792                 dbg("%s", "Invalid port \n");
1793                 return -1;
1794         }
1795
1796         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1797                 dbg("%s", "Invalid Serial \n");
1798                 return -1;
1799         }
1800
1801         dbg("%s", "Entering .......... \n");
1802
1803         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1804
1805         dbg("%s - port = %d, baud = %d", __func__,
1806             mos7840_port->port->number, baudRate);
1807         /* reset clk_uart_sel in spregOffset */
1808         if (baudRate > 115200) {
1809 #ifdef HW_flow_control
1810                 /* NOTE: need to see the pther register to modify */
1811                 /* setting h/w flow control bit to 1 */
1812                 Data = 0x2b;
1813                 mos7840_port->shadowMCR = Data;
1814                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1815                                                                         Data);
1816                 if (status < 0) {
1817                         dbg("Writing spreg failed in set_serial_baud\n");
1818                         return -1;
1819                 }
1820 #endif
1821
1822         } else {
1823 #ifdef HW_flow_control
1824                 / *setting h/w flow control bit to 0 */
1825                 Data = 0xb;
1826                 mos7840_port->shadowMCR = Data;
1827                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1828                                                                         Data);
1829                 if (status < 0) {
1830                         dbg("Writing spreg failed in set_serial_baud\n");
1831                         return -1;
1832                 }
1833 #endif
1834
1835         }
1836
1837         if (1) {                /* baudRate <= 115200) */
1838                 clk_sel_val = 0x0;
1839                 Data = 0x0;
1840                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1841                                                    &clk_sel_val);
1842                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1843                                                                  &Data);
1844                 if (status < 0) {
1845                         dbg("reading spreg failed in set_serial_baud\n");
1846                         return -1;
1847                 }
1848                 Data = (Data & 0x8f) | clk_sel_val;
1849                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1850                                                                 Data);
1851                 if (status < 0) {
1852                         dbg("Writing spreg failed in set_serial_baud\n");
1853                         return -1;
1854                 }
1855                 /* Calculate the Divisor */
1856
1857                 if (status) {
1858                         err("%s - bad baud rate", __func__);
1859                         dbg("%s\n", "bad baud rate");
1860                         return status;
1861                 }
1862                 /* Enable access to divisor latch */
1863                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1864                 mos7840_port->shadowLCR = Data;
1865                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1866
1867                 /* Write the divisor */
1868                 Data = (unsigned char)(divisor & 0xff);
1869                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1870                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1871
1872                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1873                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1874                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1875
1876                 /* Disable access to divisor latch */
1877                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1878                 mos7840_port->shadowLCR = Data;
1879                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1880
1881         }
1882         return status;
1883 }
1884
1885 /*****************************************************************************
1886  * mos7840_change_port_settings
1887  *      This routine is called to set the UART on the device to match
1888  *      the specified new settings.
1889  *****************************************************************************/
1890
1891 static void mos7840_change_port_settings(struct tty_struct *tty,
1892         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1893 {
1894         int baud;
1895         unsigned cflag;
1896         unsigned iflag;
1897         __u8 lData;
1898         __u8 lParity;
1899         __u8 lStop;
1900         int status;
1901         __u16 Data;
1902         struct usb_serial_port *port;
1903         struct usb_serial *serial;
1904
1905         if (mos7840_port == NULL)
1906                 return;
1907
1908         port = (struct usb_serial_port *)mos7840_port->port;
1909
1910         if (mos7840_port_paranoia_check(port, __func__)) {
1911                 dbg("%s", "Invalid port \n");
1912                 return;
1913         }
1914
1915         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1916                 dbg("%s", "Invalid Serial \n");
1917                 return;
1918         }
1919
1920         serial = port->serial;
1921
1922         dbg("%s - port %d", __func__, mos7840_port->port->number);
1923
1924         if (!mos7840_port->open) {
1925                 dbg("%s - port not opened", __func__);
1926                 return;
1927         }
1928
1929         dbg("%s", "Entering .......... \n");
1930
1931         lData = LCR_BITS_8;
1932         lStop = LCR_STOP_1;
1933         lParity = LCR_PAR_NONE;
1934
1935         cflag = tty->termios->c_cflag;
1936         iflag = tty->termios->c_iflag;
1937
1938         /* Change the number of bits */
1939         if (cflag & CSIZE) {
1940                 switch (cflag & CSIZE) {
1941                 case CS5:
1942                         lData = LCR_BITS_5;
1943                         break;
1944
1945                 case CS6:
1946                         lData = LCR_BITS_6;
1947                         break;
1948
1949                 case CS7:
1950                         lData = LCR_BITS_7;
1951                         break;
1952                 default:
1953                 case CS8:
1954                         lData = LCR_BITS_8;
1955                         break;
1956                 }
1957         }
1958         /* Change the Parity bit */
1959         if (cflag & PARENB) {
1960                 if (cflag & PARODD) {
1961                         lParity = LCR_PAR_ODD;
1962                         dbg("%s - parity = odd", __func__);
1963                 } else {
1964                         lParity = LCR_PAR_EVEN;
1965                         dbg("%s - parity = even", __func__);
1966                 }
1967
1968         } else {
1969                 dbg("%s - parity = none", __func__);
1970         }
1971
1972         if (cflag & CMSPAR)
1973                 lParity = lParity | 0x20;
1974
1975         /* Change the Stop bit */
1976         if (cflag & CSTOPB) {
1977                 lStop = LCR_STOP_2;
1978                 dbg("%s - stop bits = 2", __func__);
1979         } else {
1980                 lStop = LCR_STOP_1;
1981                 dbg("%s - stop bits = 1", __func__);
1982         }
1983
1984         /* Update the LCR with the correct value */
1985         mos7840_port->shadowLCR &=
1986             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1987         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1988
1989         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
1990             mos7840_port->shadowLCR);
1991         /* Disable Interrupts */
1992         Data = 0x00;
1993         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1994
1995         Data = 0x00;
1996         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1997
1998         Data = 0xcf;
1999         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2000
2001         /* Send the updated LCR value to the mos7840 */
2002         Data = mos7840_port->shadowLCR;
2003
2004         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2005
2006         Data = 0x00b;
2007         mos7840_port->shadowMCR = Data;
2008         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2009         Data = 0x00b;
2010         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2011
2012         /* set up the MCR register and send it to the mos7840 */
2013
2014         mos7840_port->shadowMCR = MCR_MASTER_IE;
2015         if (cflag & CBAUD)
2016                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2017
2018         if (cflag & CRTSCTS)
2019                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2020         else
2021                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2022
2023         Data = mos7840_port->shadowMCR;
2024         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2025
2026         /* Determine divisor based on baud rate */
2027         baud = tty_get_baud_rate(tty);
2028
2029         if (!baud) {
2030                 /* pick a default, any default... */
2031                 dbg("%s\n", "Picked default baud...");
2032                 baud = 9600;
2033         }
2034
2035         dbg("%s - baud rate = %d", __func__, baud);
2036         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2037
2038         /* Enable Interrupts */
2039         Data = 0x0c;
2040         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2041
2042         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2043                 mos7840_port->read_urb->dev = serial->dev;
2044
2045                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2046
2047                 if (status) {
2048                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2049                             status);
2050                 }
2051         }
2052         wake_up(&mos7840_port->delta_msr_wait);
2053         mos7840_port->delta_msr_cond = 1;
2054         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2055             mos7840_port->shadowLCR);
2056
2057         return;
2058 }
2059
2060 /*****************************************************************************
2061  * mos7840_set_termios
2062  *      this function is called by the tty driver when it wants to change
2063  *      the termios structure
2064  *****************************************************************************/
2065
2066 static void mos7840_set_termios(struct tty_struct *tty,
2067                                 struct usb_serial_port *port,
2068                                 struct ktermios *old_termios)
2069 {
2070         int status;
2071         unsigned int cflag;
2072         struct usb_serial *serial;
2073         struct moschip_port *mos7840_port;
2074         dbg("mos7840_set_termios: START\n");
2075         if (mos7840_port_paranoia_check(port, __func__)) {
2076                 dbg("%s", "Invalid port \n");
2077                 return;
2078         }
2079
2080         serial = port->serial;
2081
2082         if (mos7840_serial_paranoia_check(serial, __func__)) {
2083                 dbg("%s", "Invalid Serial \n");
2084                 return;
2085         }
2086
2087         mos7840_port = mos7840_get_port_private(port);
2088
2089         if (mos7840_port == NULL)
2090                 return;
2091
2092         if (!mos7840_port->open) {
2093                 dbg("%s - port not opened", __func__);
2094                 return;
2095         }
2096
2097         dbg("%s\n", "setting termios - ");
2098
2099         cflag = tty->termios->c_cflag;
2100
2101         dbg("%s - clfag %08x iflag %08x", __func__,
2102             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2103         dbg("%s - old clfag %08x old iflag %08x", __func__,
2104             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2105         dbg("%s - port %d", __func__, port->number);
2106
2107         /* change the port settings to the new ones specified */
2108
2109         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2110
2111         if (!mos7840_port->read_urb) {
2112                 dbg("%s", "URB KILLED !!!!!\n");
2113                 return;
2114         }
2115
2116         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2117                 mos7840_port->read_urb->dev = serial->dev;
2118                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2119                 if (status) {
2120                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2121                             status);
2122                 }
2123         }
2124         return;
2125 }
2126
2127 /*****************************************************************************
2128  * mos7840_get_lsr_info - get line status register info
2129  *
2130  * Purpose: Let user call ioctl() to get info when the UART physically
2131  *          is emptied.  On bus types like RS485, the transmitter must
2132  *          release the bus after transmitting. This must be done when
2133  *          the transmit shift register is empty, not be done when the
2134  *          transmit holding register is empty.  This functionality
2135  *          allows an RS485 driver to be written in user space.
2136  *****************************************************************************/
2137
2138 static int mos7840_get_lsr_info(struct tty_struct *tty,
2139                                 unsigned int __user *value)
2140 {
2141         int count;
2142         unsigned int result = 0;
2143
2144         count = mos7840_chars_in_buffer(tty);
2145         if (count == 0) {
2146                 dbg("%s -- Empty", __func__);
2147                 result = TIOCSER_TEMT;
2148         }
2149
2150         if (copy_to_user(value, &result, sizeof(int)))
2151                 return -EFAULT;
2152         return 0;
2153 }
2154
2155 /*****************************************************************************
2156  * mos7840_set_modem_info
2157  *      function to set modem info
2158  *****************************************************************************/
2159
2160 /* FIXME: Should be using the model control hooks */
2161
2162 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2163                                   unsigned int cmd, unsigned int __user *value)
2164 {
2165         unsigned int mcr;
2166         unsigned int arg;
2167         __u16 Data;
2168         int status;
2169         struct usb_serial_port *port;
2170
2171         if (mos7840_port == NULL)
2172                 return -1;
2173
2174         port = (struct usb_serial_port *)mos7840_port->port;
2175         if (mos7840_port_paranoia_check(port, __func__)) {
2176                 dbg("%s", "Invalid port \n");
2177                 return -1;
2178         }
2179
2180         mcr = mos7840_port->shadowMCR;
2181
2182         if (copy_from_user(&arg, value, sizeof(int)))
2183                 return -EFAULT;
2184
2185         switch (cmd) {
2186         case TIOCMBIS:
2187                 if (arg & TIOCM_RTS)
2188                         mcr |= MCR_RTS;
2189                 if (arg & TIOCM_DTR)
2190                         mcr |= MCR_RTS;
2191                 if (arg & TIOCM_LOOP)
2192                         mcr |= MCR_LOOPBACK;
2193                 break;
2194
2195         case TIOCMBIC:
2196                 if (arg & TIOCM_RTS)
2197                         mcr &= ~MCR_RTS;
2198                 if (arg & TIOCM_DTR)
2199                         mcr &= ~MCR_RTS;
2200                 if (arg & TIOCM_LOOP)
2201                         mcr &= ~MCR_LOOPBACK;
2202                 break;
2203
2204         case TIOCMSET:
2205                 /* turn off the RTS and DTR and LOOPBACK
2206                  * and then only turn on what was asked to */
2207                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2208                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2209                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2210                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2211                 break;
2212         }
2213
2214         mos7840_port->shadowMCR = mcr;
2215
2216         Data = mos7840_port->shadowMCR;
2217         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2218         if (status < 0) {
2219                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2220                 return -1;
2221         }
2222
2223         return 0;
2224 }
2225
2226 /*****************************************************************************
2227  * mos7840_get_modem_info
2228  *      function to get modem info
2229  *****************************************************************************/
2230
2231 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2232                                   unsigned int __user *value)
2233 {
2234         unsigned int result = 0;
2235         __u16 msr;
2236         unsigned int mcr = mos7840_port->shadowMCR;
2237         mos7840_get_uart_reg(mos7840_port->port,
2238                                                 MODEM_STATUS_REGISTER, &msr);
2239         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2240             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2241             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2242             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2243             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2244             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2245
2246         dbg("%s -- %x", __func__, result);
2247
2248         if (copy_to_user(value, &result, sizeof(int)))
2249                 return -EFAULT;
2250         return 0;
2251 }
2252
2253 /*****************************************************************************
2254  * mos7840_get_serial_info
2255  *      function to get information about serial port
2256  *****************************************************************************/
2257
2258 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2259                                    struct serial_struct __user *retinfo)
2260 {
2261         struct serial_struct tmp;
2262
2263         if (mos7840_port == NULL)
2264                 return -1;
2265
2266         if (!retinfo)
2267                 return -EFAULT;
2268
2269         memset(&tmp, 0, sizeof(tmp));
2270
2271         tmp.type = PORT_16550A;
2272         tmp.line = mos7840_port->port->serial->minor;
2273         tmp.port = mos7840_port->port->number;
2274         tmp.irq = 0;
2275         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2276         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2277         tmp.baud_base = 9600;
2278         tmp.close_delay = 5 * HZ;
2279         tmp.closing_wait = 30 * HZ;
2280
2281         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2282                 return -EFAULT;
2283         return 0;
2284 }
2285
2286 /*****************************************************************************
2287  * SerialIoctl
2288  *      this function handles any ioctl calls to the driver
2289  *****************************************************************************/
2290
2291 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2292                          unsigned int cmd, unsigned long arg)
2293 {
2294         struct usb_serial_port *port = tty->driver_data;
2295         void __user *argp = (void __user *)arg;
2296         struct moschip_port *mos7840_port;
2297
2298         struct async_icount cnow;
2299         struct async_icount cprev;
2300         struct serial_icounter_struct icount;
2301         int mosret = 0;
2302
2303         if (mos7840_port_paranoia_check(port, __func__)) {
2304                 dbg("%s", "Invalid port \n");
2305                 return -1;
2306         }
2307
2308         mos7840_port = mos7840_get_port_private(port);
2309
2310         if (mos7840_port == NULL)
2311                 return -1;
2312
2313         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2314
2315         switch (cmd) {
2316                 /* return number of bytes available */
2317
2318         case TIOCSERGETLSR:
2319                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2320                 return mos7840_get_lsr_info(tty, argp);
2321                 return 0;
2322
2323         /* FIXME: use the modem hooks and remove this */
2324         case TIOCMBIS:
2325         case TIOCMBIC:
2326         case TIOCMSET:
2327                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2328                     port->number);
2329                 mosret =
2330                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2331                 return mosret;
2332
2333         case TIOCMGET:
2334                 dbg("%s (%d) TIOCMGET", __func__, port->number);
2335                 return mos7840_get_modem_info(mos7840_port, argp);
2336
2337         case TIOCGSERIAL:
2338                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2339                 return mos7840_get_serial_info(mos7840_port, argp);
2340
2341         case TIOCSSERIAL:
2342                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2343                 break;
2344
2345         case TIOCMIWAIT:
2346                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2347                 cprev = mos7840_port->icount;
2348                 while (1) {
2349                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2350                         mos7840_port->delta_msr_cond = 0;
2351                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2352                                                  (mos7840_port->
2353                                                   delta_msr_cond == 1));
2354
2355                         /* see if a signal did it */
2356                         if (signal_pending(current))
2357                                 return -ERESTARTSYS;
2358                         cnow = mos7840_port->icount;
2359                         smp_rmb();
2360                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2361                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2362                                 return -EIO;    /* no change => error */
2363                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2364                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2365                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2366                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2367                                 return 0;
2368                         }
2369                         cprev = cnow;
2370                 }
2371                 /* NOTREACHED */
2372                 break;
2373
2374         case TIOCGICOUNT:
2375                 cnow = mos7840_port->icount;
2376                 smp_rmb();
2377                 icount.cts = cnow.cts;
2378                 icount.dsr = cnow.dsr;
2379                 icount.rng = cnow.rng;
2380                 icount.dcd = cnow.dcd;
2381                 icount.rx = cnow.rx;
2382                 icount.tx = cnow.tx;
2383                 icount.frame = cnow.frame;
2384                 icount.overrun = cnow.overrun;
2385                 icount.parity = cnow.parity;
2386                 icount.brk = cnow.brk;
2387                 icount.buf_overrun = cnow.buf_overrun;
2388
2389                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2390                     port->number, icount.rx, icount.tx);
2391                 if (copy_to_user(argp, &icount, sizeof(icount)))
2392                         return -EFAULT;
2393                 return 0;
2394         default:
2395                 break;
2396         }
2397         return -ENOIOCTLCMD;
2398 }
2399
2400 static int mos7840_calc_num_ports(struct usb_serial *serial)
2401 {
2402         int mos7840_num_ports = 0;
2403
2404         dbg("numberofendpoints: %d \n",
2405             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2406         dbg("numberofendpoints: %d \n",
2407             (int)serial->interface->altsetting->desc.bNumEndpoints);
2408         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2409                 mos7840_num_ports = serial->num_ports = 2;
2410         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2411                 serial->num_bulk_in = 4;
2412                 serial->num_bulk_out = 4;
2413                 mos7840_num_ports = serial->num_ports = 4;
2414         }
2415
2416         return mos7840_num_ports;
2417 }
2418
2419 /****************************************************************************
2420  * mos7840_startup
2421  ****************************************************************************/
2422
2423 static int mos7840_startup(struct usb_serial *serial)
2424 {
2425         struct moschip_port *mos7840_port;
2426         struct usb_device *dev;
2427         int i, status;
2428
2429         __u16 Data;
2430         dbg("%s \n", " mos7840_startup :entering..........");
2431
2432         if (!serial) {
2433                 dbg("%s\n", "Invalid Handler");
2434                 return -1;
2435         }
2436
2437         dev = serial->dev;
2438
2439         dbg("%s\n", "Entering...");
2440
2441         /* we set up the pointers to the endpoints in the mos7840_open *
2442          * function, as the structures aren't created yet.             */
2443
2444         /* set up port private structures */
2445         for (i = 0; i < serial->num_ports; ++i) {
2446                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2447                 if (mos7840_port == NULL) {
2448                         err("%s - Out of memory", __func__);
2449                         status = -ENOMEM;
2450                         i--; /* don't follow NULL pointer cleaning up */
2451                         goto error;
2452                 }
2453
2454                 /* Initialize all port interrupt end point to port 0 int
2455                  * endpoint. Our device has only one interrupt end point
2456                  * common to all port */
2457
2458                 mos7840_port->port = serial->port[i];
2459                 mos7840_set_port_private(serial->port[i], mos7840_port);
2460                 spin_lock_init(&mos7840_port->pool_lock);
2461
2462                 mos7840_port->port_num = ((serial->port[i]->number -
2463                                            (serial->port[i]->serial->minor)) +
2464                                           1);
2465
2466                 if (mos7840_port->port_num == 1) {
2467                         mos7840_port->SpRegOffset = 0x0;
2468                         mos7840_port->ControlRegOffset = 0x1;
2469                         mos7840_port->DcrRegOffset = 0x4;
2470                 } else if ((mos7840_port->port_num == 2)
2471                            && (serial->num_ports == 4)) {
2472                         mos7840_port->SpRegOffset = 0x8;
2473                         mos7840_port->ControlRegOffset = 0x9;
2474                         mos7840_port->DcrRegOffset = 0x16;
2475                 } else if ((mos7840_port->port_num == 2)
2476                            && (serial->num_ports == 2)) {
2477                         mos7840_port->SpRegOffset = 0xa;
2478                         mos7840_port->ControlRegOffset = 0xb;
2479                         mos7840_port->DcrRegOffset = 0x19;
2480                 } else if ((mos7840_port->port_num == 3)
2481                            && (serial->num_ports == 4)) {
2482                         mos7840_port->SpRegOffset = 0xa;
2483                         mos7840_port->ControlRegOffset = 0xb;
2484                         mos7840_port->DcrRegOffset = 0x19;
2485                 } else if ((mos7840_port->port_num == 4)
2486                            && (serial->num_ports == 4)) {
2487                         mos7840_port->SpRegOffset = 0xc;
2488                         mos7840_port->ControlRegOffset = 0xd;
2489                         mos7840_port->DcrRegOffset = 0x1c;
2490                 }
2491                 mos7840_dump_serial_port(mos7840_port);
2492                 mos7840_set_port_private(serial->port[i], mos7840_port);
2493
2494                 /* enable rx_disable bit in control register */
2495                 status = mos7840_get_reg_sync(serial->port[i],
2496                                  mos7840_port->ControlRegOffset, &Data);
2497                 if (status < 0) {
2498                         dbg("Reading ControlReg failed status-0x%x\n", status);
2499                         break;
2500                 } else
2501                         dbg("ControlReg Reading success val is %x, status%d\n",
2502                             Data, status);
2503                 Data |= 0x08;   /* setting driver done bit */
2504                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2505                                    modem status reg */
2506
2507                 /* Data |= 0x20; //rx_disable bit */
2508                 status = mos7840_set_reg_sync(serial->port[i],
2509                                          mos7840_port->ControlRegOffset, Data);
2510                 if (status < 0) {
2511                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2512                         break;
2513                 } else
2514                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2515                             status);
2516
2517                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2518                    and 0x24 in DCR3 */
2519                 Data = 0x01;
2520                 status = mos7840_set_reg_sync(serial->port[i],
2521                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2522                 if (status < 0) {
2523                         dbg("Writing DCR0 failed status-0x%x\n", status);
2524                         break;
2525                 } else
2526                         dbg("DCR0 Writing success status%d\n", status);
2527
2528                 Data = 0x05;
2529                 status = mos7840_set_reg_sync(serial->port[i],
2530                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2531                 if (status < 0) {
2532                         dbg("Writing DCR1 failed status-0x%x\n", status);
2533                         break;
2534                 } else
2535                         dbg("DCR1 Writing success status%d\n", status);
2536
2537                 Data = 0x24;
2538                 status = mos7840_set_reg_sync(serial->port[i],
2539                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2540                 if (status < 0) {
2541                         dbg("Writing DCR2 failed status-0x%x\n", status);
2542                         break;
2543                 } else
2544                         dbg("DCR2 Writing success status%d\n", status);
2545
2546                 /* write values in clkstart0x0 and clkmulti 0x20 */
2547                 Data = 0x0;
2548                 status = mos7840_set_reg_sync(serial->port[i],
2549                                          CLK_START_VALUE_REGISTER, Data);
2550                 if (status < 0) {
2551                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2552                         break;
2553                 } else
2554                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2555
2556                 Data = 0x20;
2557                 status = mos7840_set_reg_sync(serial->port[i],
2558                                         CLK_MULTI_REGISTER, Data);
2559                 if (status < 0) {
2560                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2561                             status);
2562                         goto error;
2563                 } else
2564                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2565                             status);
2566
2567                 /* write value 0x0 to scratchpad register */
2568                 Data = 0x00;
2569                 status = mos7840_set_uart_reg(serial->port[i],
2570                                                 SCRATCH_PAD_REGISTER, Data);
2571                 if (status < 0) {
2572                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2573                             status);
2574                         break;
2575                 } else
2576                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2577                             status);
2578
2579                 /* Zero Length flag register */
2580                 if ((mos7840_port->port_num != 1)
2581                     && (serial->num_ports == 2)) {
2582
2583                         Data = 0xff;
2584                         status = mos7840_set_reg_sync(serial->port[i],
2585                                       (__u16) (ZLP_REG1 +
2586                                       ((__u16)mos7840_port->port_num)), Data);
2587                         dbg("ZLIP offset%x\n",
2588                             (__u16) (ZLP_REG1 +
2589                                         ((__u16) mos7840_port->port_num)));
2590                         if (status < 0) {
2591                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2592                                     i + 2, status);
2593                                 break;
2594                         } else
2595                                 dbg("ZLP_REG%d Writing success status%d\n",
2596                                     i + 2, status);
2597                 } else {
2598                         Data = 0xff;
2599                         status = mos7840_set_reg_sync(serial->port[i],
2600                               (__u16) (ZLP_REG1 +
2601                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2602                         dbg("ZLIP offset%x\n",
2603                             (__u16) (ZLP_REG1 +
2604                                      ((__u16) mos7840_port->port_num) - 0x1));
2605                         if (status < 0) {
2606                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2607                                     i + 1, status);
2608                                 break;
2609                         } else
2610                                 dbg("ZLP_REG%d Writing success status%d\n",
2611                                     i + 1, status);
2612
2613                 }
2614                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2615                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2616                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2617                                                                 GFP_KERNEL);
2618                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2619                                                         !mos7840_port->dr) {
2620                         status = -ENOMEM;
2621                         goto error;
2622                 }
2623         }
2624
2625         /* Zero Length flag enable */
2626         Data = 0x0f;
2627         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2628         if (status < 0) {
2629                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2630                 goto error;
2631         } else
2632                 dbg("ZLP_REG5 Writing success status%d\n", status);
2633
2634         /* setting configuration feature to one */
2635         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2636                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2637         return 0;
2638 error:
2639         for (/* nothing */; i >= 0; i--) {
2640                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2641
2642                 kfree(mos7840_port->dr);
2643                 kfree(mos7840_port->ctrl_buf);
2644                 usb_free_urb(mos7840_port->control_urb);
2645                 kfree(mos7840_port);
2646                 serial->port[i] = NULL;
2647         }
2648         return status;
2649 }
2650
2651 /****************************************************************************
2652  * mos7840_shutdown
2653  *      This function is called whenever the device is removed from the usb bus.
2654  ****************************************************************************/
2655
2656 static void mos7840_shutdown(struct usb_serial *serial)
2657 {
2658         int i;
2659         unsigned long flags;
2660         struct moschip_port *mos7840_port;
2661         dbg("%s \n", " shutdown :entering..........");
2662
2663         if (!serial) {
2664                 dbg("%s", "Invalid Handler \n");
2665                 return;
2666         }
2667
2668         /* check for the ports to be closed,close the ports and disconnect */
2669
2670         /* free private structure allocated for serial port  *
2671          * stop reads and writes on all ports                */
2672
2673         for (i = 0; i < serial->num_ports; ++i) {
2674                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2675                 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2676                 mos7840_port->zombie = 1;
2677                 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2678                 usb_kill_urb(mos7840_port->control_urb);
2679                 kfree(mos7840_port->ctrl_buf);
2680                 kfree(mos7840_port->dr);
2681                 kfree(mos7840_port);
2682                 mos7840_set_port_private(serial->port[i], NULL);
2683         }
2684
2685         dbg("%s\n", "Thank u :: ");
2686
2687 }
2688
2689 static struct usb_driver io_driver = {
2690         .name = "mos7840",
2691         .probe = usb_serial_probe,
2692         .disconnect = usb_serial_disconnect,
2693         .id_table = moschip_id_table_combined,
2694         .no_dynamic_id = 1,
2695 };
2696
2697 static struct usb_serial_driver moschip7840_4port_device = {
2698         .driver = {
2699                    .owner = THIS_MODULE,
2700                    .name = "mos7840",
2701                    },
2702         .description = DRIVER_DESC,
2703         .usb_driver = &io_driver,
2704         .id_table = moschip_port_id_table,
2705         .num_ports = 4,
2706         .open = mos7840_open,
2707         .close = mos7840_close,
2708         .write = mos7840_write,
2709         .write_room = mos7840_write_room,
2710         .chars_in_buffer = mos7840_chars_in_buffer,
2711         .throttle = mos7840_throttle,
2712         .unthrottle = mos7840_unthrottle,
2713         .calc_num_ports = mos7840_calc_num_ports,
2714 #ifdef MCSSerialProbe
2715         .probe = mos7840_serial_probe,
2716 #endif
2717         .ioctl = mos7840_ioctl,
2718         .set_termios = mos7840_set_termios,
2719         .break_ctl = mos7840_break,
2720         .tiocmget = mos7840_tiocmget,
2721         .tiocmset = mos7840_tiocmset,
2722         .attach = mos7840_startup,
2723         .shutdown = mos7840_shutdown,
2724         .read_bulk_callback = mos7840_bulk_in_callback,
2725         .read_int_callback = mos7840_interrupt_callback,
2726 };
2727
2728 /****************************************************************************
2729  * moschip7840_init
2730  *      This is called by the module subsystem, or on startup to initialize us
2731  ****************************************************************************/
2732 static int __init moschip7840_init(void)
2733 {
2734         int retval;
2735
2736         dbg("%s \n", " mos7840_init :entering..........");
2737
2738         /* Register with the usb serial */
2739         retval = usb_serial_register(&moschip7840_4port_device);
2740
2741         if (retval)
2742                 goto failed_port_device_register;
2743
2744         dbg("%s\n", "Entring...");
2745         info(DRIVER_DESC " " DRIVER_VERSION);
2746
2747         /* Register with the usb */
2748         retval = usb_register(&io_driver);
2749         if (retval == 0) {
2750                 dbg("%s\n", "Leaving...");
2751                 return 0;
2752         }
2753         usb_serial_deregister(&moschip7840_4port_device);
2754 failed_port_device_register:
2755         return retval;
2756 }
2757
2758 /****************************************************************************
2759  * moschip7840_exit
2760  *      Called when the driver is about to be unloaded.
2761  ****************************************************************************/
2762 static void __exit moschip7840_exit(void)
2763 {
2764
2765         dbg("%s \n", " mos7840_exit :entering..........");
2766
2767         usb_deregister(&io_driver);
2768
2769         usb_serial_deregister(&moschip7840_4port_device);
2770
2771         dbg("%s\n", "Entring...");
2772 }
2773
2774 module_init(moschip7840_init);
2775 module_exit(moschip7840_exit);
2776
2777 /* Module information */
2778 MODULE_DESCRIPTION(DRIVER_DESC);
2779 MODULE_LICENSE("GPL");
2780
2781 module_param(debug, bool, S_IRUGO | S_IWUSR);
2782 MODULE_PARM_DESC(debug, "Debug enabled or not");