err.no Git - linux-2.6/blob - drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <asm/uaccess.h>
  37
  38 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.1"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0 )       /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5 )       /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          //Zero_Flag_Reg1    58
 106 #define ZLP_REG5  0x3E          //Zero_Flag_Reg5    62
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 #define USB_VENDOR_ID_MOSCHIP           0x9710
 114 #define MOSCHIP_DEVICE_ID_7840          0x7840
 115 #define MOSCHIP_DEVICE_ID_7820          0x7820
 116
 117 /* Interrupt Rotinue Defines    */
 118
 119 #define SERIAL_IIR_RLS      0x06
 120 #define SERIAL_IIR_MS       0x00
 121
 122 /*
 123  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 124  */
 125 #define SERIAL_LSR_DR       0x0001
 126 #define SERIAL_LSR_OE       0x0002
 127 #define SERIAL_LSR_PE       0x0004
 128 #define SERIAL_LSR_FE       0x0008
 129 #define SERIAL_LSR_BI       0x0010
 130
 131 #define MOS_MSR_DELTA_CTS   0x10
 132 #define MOS_MSR_DELTA_DSR   0x20
 133 #define MOS_MSR_DELTA_RI    0x40
 134 #define MOS_MSR_DELTA_CD    0x80
 135
 136 // Serial Port register Address
 137 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 138 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 139 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 140 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 141 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 142 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 143 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 144 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 145 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 146
 147 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 148 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 149
 150 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 151
 152 /*
 153  * URB POOL related defines
 154  */
 155 #define NUM_URBS                        16      /* URB Count */
 156 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 157
 158
 159 static struct usb_device_id moschip_port_id_table[] = {
 160         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 161         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 162         {}                      /* terminating entry */
 163 };
 164
 165 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 166         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 167         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 168         {}                      /* terminating entry */
 169 };
 170
 171 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 172
 173 /* This structure holds all of the local port information */
 174
 175 struct moschip_port {
 176         int port_num;           /*Actual port number in the device(1,2,etc) */
 177         struct urb *write_urb;  /* write URB for this port */
 178         struct urb *read_urb;   /* read URB for this port */
 179         struct urb *int_urb;
 180         __u8 shadowLCR;         /* last LCR value received */
 181         __u8 shadowMCR;         /* last MCR value received */
 182         char open;
 183         char open_ports;
 184         char zombie;
 185         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 186         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 187         int delta_msr_cond;
 188         struct async_icount icount;
 189         struct usb_serial_port *port;   /* loop back to the owner of this object */
 190
 191         /*Offsets */
 192         __u8 SpRegOffset;
 193         __u8 ControlRegOffset;
 194         __u8 DcrRegOffset;
 195         //for processing control URBS in interrupt context
 196         struct urb *control_urb;
 197         struct usb_ctrlrequest *dr;
 198         char *ctrl_buf;
 199         int MsrLsr;
 200
 201         spinlock_t pool_lock;
 202         struct urb *write_urb_pool[NUM_URBS];
 203         char busy[NUM_URBS];
 204 };
 205
 206
 207 static int debug;
 208
 209 /*
 210  * mos7840_set_reg_sync
 211  *      To set the Control register by calling usb_fill_control_urb function
 212  *      by passing usb_sndctrlpipe function as parameter.
 213  */
 214
 215 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 216                                 __u16 val)
 217 {
 218         struct usb_device *dev = port->serial->dev;
 219         val = val & 0x00ff;
 220         dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 221
 222         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 223                                MCS_WR_RTYPE, val, reg, NULL, 0,
 224                                MOS_WDR_TIMEOUT);
 225 }
 226
 227 /*
 228  * mos7840_get_reg_sync
 229  *      To set the Uart register by calling usb_fill_control_urb function by
 230  *      passing usb_rcvctrlpipe function as parameter.
 231  */
 232
 233 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 234                                 __u16 * val)
 235 {
 236         struct usb_device *dev = port->serial->dev;
 237         int ret = 0;
 238
 239         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 240                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 241                               MOS_WDR_TIMEOUT);
 242         dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
 243         *val = (*val) & 0x00ff;
 244         return ret;
 245 }
 246
 247 /*
 248  * mos7840_set_uart_reg
 249  *      To set the Uart register by calling usb_fill_control_urb function by
 250  *      passing usb_sndctrlpipe function as parameter.
 251  */
 252
 253 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 254                                 __u16 val)
 255 {
 256
 257         struct usb_device *dev = port->serial->dev;
 258         val = val & 0x00ff;
 259         // For the UART control registers, the application number need to be Or'ed
 260         if (port->serial->num_ports == 4) {
 261                 val |=
 262                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 263                      1) << 8;
 264                 dbg("mos7840_set_uart_reg application number is %x\n", val);
 265         } else {
 266                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 267                         val |=
 268                             (((__u16) port->number -
 269                               (__u16) (port->serial->minor)) + 1) << 8;
 270                         dbg("mos7840_set_uart_reg application number is %x\n",
 271                             val);
 272                 } else {
 273                         val |=
 274                             (((__u16) port->number -
 275                               (__u16) (port->serial->minor)) + 2) << 8;
 276                         dbg("mos7840_set_uart_reg application number is %x\n",
 277                             val);
 278                 }
 279         }
 280         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 281                                MCS_WR_RTYPE, val, reg, NULL, 0,
 282                                MOS_WDR_TIMEOUT);
 283
 284 }
 285
 286 /*
 287  * mos7840_get_uart_reg
 288  *      To set the Control register by calling usb_fill_control_urb function
 289  *      by passing usb_rcvctrlpipe function as parameter.
 290  */
 291 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 292                                 __u16 * val)
 293 {
 294         struct usb_device *dev = port->serial->dev;
 295         int ret = 0;
 296         __u16 Wval;
 297
 298         //dbg("application number is %4x \n",(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8);
 299         /*Wval  is same as application number */
 300         if (port->serial->num_ports == 4) {
 301                 Wval =
 302                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 303                      1) << 8;
 304                 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
 305         } else {
 306                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 307                         Wval =
 308                             (((__u16) port->number -
 309                               (__u16) (port->serial->minor)) + 1) << 8;
 310                         dbg("mos7840_get_uart_reg application number is %x\n",
 311                             Wval);
 312                 } else {
 313                         Wval =
 314                             (((__u16) port->number -
 315                               (__u16) (port->serial->minor)) + 2) << 8;
 316                         dbg("mos7840_get_uart_reg application number is %x\n",
 317                             Wval);
 318                 }
 319         }
 320         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 321                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 322                               MOS_WDR_TIMEOUT);
 323         *val = (*val) & 0x00ff;
 324         return ret;
 325 }
 326
 327 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 328 {
 329
 330         dbg("***************************************\n");
 331         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 332         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 333         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 334         dbg("***************************************\n");
 335
 336 }
 337
 338 /************************************************************************/
 339 /************************************************************************/
 340 /*             I N T E R F A C E   F U N C T I O N S                    */
 341 /*             I N T E R F A C E   F U N C T I O N S                    */
 342 /************************************************************************/
 343 /************************************************************************/
 344
 345 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 346                                             struct moschip_port *data)
 347 {
 348         usb_set_serial_port_data(port, (void *)data);
 349 }
 350
 351 static inline struct moschip_port *mos7840_get_port_private(struct
 352                                                             usb_serial_port
 353                                                             *port)
 354 {
 355         return (struct moschip_port *)usb_get_serial_port_data(port);
 356 }
 357
 358 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 359 {
 360         struct moschip_port *mos7840_port;
 361         struct async_icount *icount;
 362         mos7840_port = port;
 363         icount = &mos7840_port->icount;
 364         if (new_msr &
 365             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 366              MOS_MSR_DELTA_CD)) {
 367                 icount = &mos7840_port->icount;
 368
 369                 /* update input line counters */
 370                 if (new_msr & MOS_MSR_DELTA_CTS) {
 371                         icount->cts++;
 372                         smp_wmb();
 373                 }
 374                 if (new_msr & MOS_MSR_DELTA_DSR) {
 375                         icount->dsr++;
 376                         smp_wmb();
 377                 }
 378                 if (new_msr & MOS_MSR_DELTA_CD) {
 379                         icount->dcd++;
 380                         smp_wmb();
 381                 }
 382                 if (new_msr & MOS_MSR_DELTA_RI) {
 383                         icount->rng++;
 384                         smp_wmb();
 385                 }
 386         }
 387 }
 388
 389 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 390 {
 391         struct async_icount *icount;
 392
 393         dbg("%s - %02x", __FUNCTION__, new_lsr);
 394
 395         if (new_lsr & SERIAL_LSR_BI) {
 396                 //
 397                 // Parity and Framing errors only count if they
 398                 // occur exclusive of a break being
 399                 // received.
 400                 //
 401                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 402         }
 403
 404         /* update input line counters */
 405         icount = &port->icount;
 406         if (new_lsr & SERIAL_LSR_BI) {
 407                 icount->brk++;
 408                 smp_wmb();
 409         }
 410         if (new_lsr & SERIAL_LSR_OE) {
 411                 icount->overrun++;
 412                 smp_wmb();
 413         }
 414         if (new_lsr & SERIAL_LSR_PE) {
 415                 icount->parity++;
 416                 smp_wmb();
 417         }
 418         if (new_lsr & SERIAL_LSR_FE) {
 419                 icount->frame++;
 420                 smp_wmb();
 421         }
 422 }
 423
 424 /************************************************************************/
 425 /************************************************************************/
 426 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 427 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 428 /************************************************************************/
 429 /************************************************************************/
 430
 431 static void mos7840_control_callback(struct urb *urb)
 432 {
 433         unsigned char *data;
 434         struct moschip_port *mos7840_port;
 435         __u8 regval = 0x0;
 436         int result = 0;
 437         int status = urb->status;
 438
 439         mos7840_port = (struct moschip_port *)urb->context;
 440
 441         switch (status) {
 442         case 0:
 443                 /* success */
 444                 break;
 445         case -ECONNRESET:
 446         case -ENOENT:
 447         case -ESHUTDOWN:
 448                 /* this urb is terminated, clean up */
 449                 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
 450                     status);
 451                 return;
 452         default:
 453                 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
 454                     status);
 455                 goto exit;
 456         }
 457
 458         dbg("%s urb buffer size is %d\n", __FUNCTION__, urb->actual_length);
 459         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __FUNCTION__,
 460             mos7840_port->MsrLsr, mos7840_port->port_num);
 461         data = urb->transfer_buffer;
 462         regval = (__u8) data[0];
 463         dbg("%s data is %x\n", __FUNCTION__, regval);
 464         if (mos7840_port->MsrLsr == 0)
 465                 mos7840_handle_new_msr(mos7840_port, regval);
 466         else if (mos7840_port->MsrLsr == 1)
 467                 mos7840_handle_new_lsr(mos7840_port, regval);
 468
 469 exit:
 470         spin_lock(&mos7840_port->pool_lock);
 471         if (!mos7840_port->zombie)
 472                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 473         spin_unlock(&mos7840_port->pool_lock);
 474         if (result) {
 475                 dev_err(&urb->dev->dev,
 476                         "%s - Error %d submitting interrupt urb\n",
 477                         __FUNCTION__, result);
 478         }
 479 }
 480
 481 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 482                            __u16 * val)
 483 {
 484         struct usb_device *dev = mcs->port->serial->dev;
 485         struct usb_ctrlrequest *dr = mcs->dr;
 486         unsigned char *buffer = mcs->ctrl_buf;
 487         int ret;
 488
 489         dr->bRequestType = MCS_RD_RTYPE;
 490         dr->bRequest = MCS_RDREQ;
 491         dr->wValue = cpu_to_le16(Wval); //0;
 492         dr->wIndex = cpu_to_le16(reg);
 493         dr->wLength = cpu_to_le16(2);
 494
 495         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 496                              (unsigned char *)dr, buffer, 2,
 497                              mos7840_control_callback, mcs);
 498         mcs->control_urb->transfer_buffer_length = 2;
 499         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 500         return ret;
 501 }
 502
 503 /*****************************************************************************
 504  * mos7840_interrupt_callback
 505  *      this is the callback function for when we have received data on the
 506  *      interrupt endpoint.
 507  *****************************************************************************/
 508
 509 static void mos7840_interrupt_callback(struct urb *urb)
 510 {
 511         int result;
 512         int length;
 513         struct moschip_port *mos7840_port;
 514         struct usb_serial *serial;
 515         __u16 Data;
 516         unsigned char *data;
 517         __u8 sp[5], st;
 518         int i, rv = 0;
 519         __u16 wval, wreg = 0;
 520         int status = urb->status;
 521
 522         dbg("%s", " : Entering\n");
 523
 524         switch (status) {
 525         case 0:
 526                 /* success */
 527                 break;
 528         case -ECONNRESET:
 529         case -ENOENT:
 530         case -ESHUTDOWN:
 531                 /* this urb is terminated, clean up */
 532                 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
 533                     status);
 534                 return;
 535         default:
 536                 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
 537                     status);
 538                 goto exit;
 539         }
 540
 541         length = urb->actual_length;
 542         data = urb->transfer_buffer;
 543
 544         serial = (struct usb_serial *)urb->context;
 545
 546         /* Moschip get 5 bytes
 547          * Byte 1 IIR Port 1 (port.number is 0)
 548          * Byte 2 IIR Port 2 (port.number is 1)
 549          * Byte 3 IIR Port 3 (port.number is 2)
 550          * Byte 4 IIR Port 4 (port.number is 3)
 551          * Byte 5 FIFO status for both */
 552
 553         if (length && length > 5) {
 554                 dbg("%s \n", "Wrong data !!!");
 555                 return;
 556         }
 557
 558         sp[0] = (__u8) data[0];
 559         sp[1] = (__u8) data[1];
 560         sp[2] = (__u8) data[2];
 561         sp[3] = (__u8) data[3];
 562         st = (__u8) data[4];
 563
 564         for (i = 0; i < serial->num_ports; i++) {
 565                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 566                 wval =
 567                     (((__u16) serial->port[i]->number -
 568                       (__u16) (serial->minor)) + 1) << 8;
 569                 if (mos7840_port->open) {
 570                         if (sp[i] & 0x01) {
 571                                 dbg("SP%d No Interrupt !!!\n", i);
 572                         } else {
 573                                 switch (sp[i] & 0x0f) {
 574                                 case SERIAL_IIR_RLS:
 575                                         dbg("Serial Port %d: Receiver status error or ", i);
 576                                         dbg("address bit detected in 9-bit mode\n");
 577                                         mos7840_port->MsrLsr = 1;
 578                                         wreg = LINE_STATUS_REGISTER;
 579                                         break;
 580                                 case SERIAL_IIR_MS:
 581                                         dbg("Serial Port %d: Modem status change\n", i);
 582                                         mos7840_port->MsrLsr = 0;
 583                                         wreg = MODEM_STATUS_REGISTER;
 584                                         break;
 585                                 }
 586                                 spin_lock(&mos7840_port->pool_lock);
 587                                 if (!mos7840_port->zombie) {
 588                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 589                                 } else {
 590                                         spin_unlock(&mos7840_port->pool_lock);
 591                                         return;
 592                                 }
 593                                 spin_unlock(&mos7840_port->pool_lock);
 594                         }
 595                 }
 596         }
 597         if (!(rv < 0)) /* the completion handler for the control urb will resubmit */
 598                 return;
 599 exit:
 600         result = usb_submit_urb(urb, GFP_ATOMIC);
 601         if (result) {
 602                 dev_err(&urb->dev->dev,
 603                         "%s - Error %d submitting interrupt urb\n",
 604                         __FUNCTION__, result);
 605         }
 606 }
 607
 608 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 609                                        const char *function)
 610 {
 611         if (!port) {
 612                 dbg("%s - port == NULL", function);
 613                 return -1;
 614         }
 615         if (!port->serial) {
 616                 dbg("%s - port->serial == NULL", function);
 617                 return -1;
 618         }
 619
 620         return 0;
 621 }
 622
 623 /* Inline functions to check the sanity of a pointer that is passed to us */
 624 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 625                                          const char *function)
 626 {
 627         if (!serial) {
 628                 dbg("%s - serial == NULL", function);
 629                 return -1;
 630         }
 631         if (!serial->type) {
 632                 dbg("%s - serial->type == NULL!", function);
 633                 return -1;
 634         }
 635
 636         return 0;
 637 }
 638
 639 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 640                                                  const char *function)
 641 {
 642         /* if no port was specified, or it fails a paranoia check */
 643         if (!port ||
 644             mos7840_port_paranoia_check(port, function) ||
 645             mos7840_serial_paranoia_check(port->serial, function)) {
 646                 /* then say that we don't have a valid usb_serial thing, which will
 647                  * end up genrating -ENODEV return values */
 648                 return NULL;
 649         }
 650
 651         return port->serial;
 652 }
 653
 654 /*****************************************************************************
 655  * mos7840_bulk_in_callback
 656  *      this is the callback function for when we have received data on the
 657  *      bulk in endpoint.
 658  *****************************************************************************/
 659
 660 static void mos7840_bulk_in_callback(struct urb *urb)
 661 {
 662         int retval;
 663         unsigned char *data;
 664         struct usb_serial *serial;
 665         struct usb_serial_port *port;
 666         struct moschip_port *mos7840_port;
 667         struct tty_struct *tty;
 668         int status = urb->status;
 669
 670         if (status) {
 671                 dbg("nonzero read bulk status received: %d", status);
 672                 return;
 673         }
 674
 675         mos7840_port = (struct moschip_port *)urb->context;
 676         if (!mos7840_port) {
 677                 dbg("%s", "NULL mos7840_port pointer \n");
 678                 return;
 679         }
 680
 681         port = (struct usb_serial_port *)mos7840_port->port;
 682         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
 683                 dbg("%s", "Port Paranoia failed \n");
 684                 return;
 685         }
 686
 687         serial = mos7840_get_usb_serial(port, __FUNCTION__);
 688         if (!serial) {
 689                 dbg("%s\n", "Bad serial pointer ");
 690                 return;
 691         }
 692
 693         dbg("%s\n", "Entering... \n");
 694
 695         data = urb->transfer_buffer;
 696
 697         dbg("%s", "Entering ........... \n");
 698
 699         if (urb->actual_length) {
 700                 tty = mos7840_port->port->tty;
 701                 if (tty) {
 702                         tty_buffer_request_room(tty, urb->actual_length);
 703                         tty_insert_flip_string(tty, data, urb->actual_length);
 704                         dbg(" %s \n", data);
 705                         tty_flip_buffer_push(tty);
 706                 }
 707                 mos7840_port->icount.rx += urb->actual_length;
 708                 smp_wmb();
 709                 dbg("mos7840_port->icount.rx is %d:\n",
 710                     mos7840_port->icount.rx);
 711         }
 712
 713         if (!mos7840_port->read_urb) {
 714                 dbg("%s", "URB KILLED !!!\n");
 715                 return;
 716         }
 717
 718
 719         mos7840_port->read_urb->dev = serial->dev;
 720
 721         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 722
 723         if (retval) {
 724                 dbg(" usb_submit_urb(read bulk) failed, retval = %d",
 725                  retval);
 726         }
 727 }
 728
 729 /*****************************************************************************
 730  * mos7840_bulk_out_data_callback
 731  *      this is the callback function for when we have finished sending serial data
 732  *      on the bulk out endpoint.
 733  *****************************************************************************/
 734
 735 static void mos7840_bulk_out_data_callback(struct urb *urb)
 736 {
 737         struct moschip_port *mos7840_port;
 738         struct tty_struct *tty;
 739         int status = urb->status;
 740         int i;
 741
 742         mos7840_port = (struct moschip_port *)urb->context;
 743         spin_lock(&mos7840_port->pool_lock);
 744         for (i = 0; i < NUM_URBS; i++) {
 745                 if (urb == mos7840_port->write_urb_pool[i]) {
 746                         mos7840_port->busy[i] = 0;
 747                         break;
 748                 }
 749         }
 750         spin_unlock(&mos7840_port->pool_lock);
 751
 752         if (status) {
 753                 dbg("nonzero write bulk status received:%d\n", status);
 754                 return;
 755         }
 756
 757         if (mos7840_port_paranoia_check(mos7840_port->port, __FUNCTION__)) {
 758                 dbg("%s", "Port Paranoia failed \n");
 759                 return;
 760         }
 761
 762         dbg("%s \n", "Entering .........");
 763
 764         tty = mos7840_port->port->tty;
 765
 766         if (tty && mos7840_port->open)
 767                 tty_wakeup(tty);
 768
 769 }
 770
 771 /************************************************************************/
 772 /*       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       */
 773 /************************************************************************/
 774 #ifdef MCSSerialProbe
 775 static int mos7840_serial_probe(struct usb_serial *serial,
 776                                 const struct usb_device_id *id)
 777 {
 778
 779         /*need to implement the mode_reg reading and updating\
 780            structures usb_serial_ device_type\
 781            (i.e num_ports, num_bulkin,bulkout etc) */
 782         /* Also we can update the changes  attach */
 783         return 1;
 784 }
 785 #endif
 786
 787 /*****************************************************************************
 788  * mos7840_open
 789  *      this function is called by the tty driver when a port is opened
 790  *      If successful, we return 0
 791  *      Otherwise we return a negative error number.
 792  *****************************************************************************/
 793
 794 static int mos7840_open(struct usb_serial_port *port, struct file *filp)
 795 {
 796         int response;
 797         int j;
 798         struct usb_serial *serial;
 799         struct urb *urb;
 800         __u16 Data;
 801         int status;
 802         struct moschip_port *mos7840_port;
 803         struct moschip_port *port0;
 804
 805         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
 806                 dbg("%s", "Port Paranoia failed \n");
 807                 return -ENODEV;
 808         }
 809
 810         serial = port->serial;
 811
 812         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
 813                 dbg("%s", "Serial Paranoia failed \n");
 814                 return -ENODEV;
 815         }
 816
 817         mos7840_port = mos7840_get_port_private(port);
 818         port0 = mos7840_get_port_private(serial->port[0]);
 819
 820         if (mos7840_port == NULL || port0 == NULL)
 821                 return -ENODEV;
 822
 823         usb_clear_halt(serial->dev, port->write_urb->pipe);
 824         usb_clear_halt(serial->dev, port->read_urb->pipe);
 825         port0->open_ports++;
 826
 827         /* Initialising the write urb pool */
 828         for (j = 0; j < NUM_URBS; ++j) {
 829                 urb = usb_alloc_urb(0, GFP_KERNEL);
 830                 mos7840_port->write_urb_pool[j] = urb;
 831
 832                 if (urb == NULL) {
 833                         err("No more urbs???");
 834                         continue;
 835                 }
 836
 837                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
 838                 if (!urb->transfer_buffer) {
 839                         usb_free_urb(urb);
 840                         mos7840_port->write_urb_pool[j] = NULL;
 841                         err("%s-out of memory for urb buffers.", __FUNCTION__);
 842                         continue;
 843                 }
 844         }
 845
 846 /*****************************************************************************
 847  * Initialize MCS7840 -- Write Init values to corresponding Registers
 848  *
 849  * Register Index
 850  * 1 : IER
 851  * 2 : FCR
 852  * 3 : LCR
 853  * 4 : MCR
 854  *
 855  * 0x08 : SP1/2 Control Reg
 856  *****************************************************************************/
 857
 858 //NEED to check the following Block
 859
 860         status = 0;
 861         Data = 0x0;
 862         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 863         if (status < 0) {
 864                 dbg("Reading Spreg failed\n");
 865                 return -1;
 866         }
 867         Data |= 0x80;
 868         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 869         if (status < 0) {
 870                 dbg("writing Spreg failed\n");
 871                 return -1;
 872         }
 873
 874         Data &= ~0x80;
 875         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 876         if (status < 0) {
 877                 dbg("writing Spreg failed\n");
 878                 return -1;
 879         }
 880 //End of block to be checked
 881
 882         status = 0;
 883         Data = 0x0;
 884         status =
 885             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 886         if (status < 0) {
 887                 dbg("Reading Controlreg failed\n");
 888                 return -1;
 889         }
 890         Data |= 0x08;           //Driver done bit
 891         Data |= 0x20;           //rx_disable
 892         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 893         if (status < 0) {
 894                 dbg("writing Controlreg failed\n");
 895                 return -1;
 896         }
 897         //do register settings here
 898         // Set all regs to the device default values.
 899         ////////////////////////////////////
 900         // First Disable all interrupts.
 901         ////////////////////////////////////
 902
 903         Data = 0x00;
 904         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 905         if (status < 0) {
 906                 dbg("disableing interrupts failed\n");
 907                 return -1;
 908         }
 909         // Set FIFO_CONTROL_REGISTER to the default value
 910         Data = 0x00;
 911         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 912         if (status < 0) {
 913                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 914                 return -1;
 915         }
 916
 917         Data = 0xcf;
 918         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 919         if (status < 0) {
 920                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 921                 return -1;
 922         }
 923
 924         Data = 0x03;
 925         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 926         mos7840_port->shadowLCR = Data;
 927
 928         Data = 0x0b;
 929         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 930         mos7840_port->shadowMCR = Data;
 931
 932         Data = 0x00;
 933         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 934         mos7840_port->shadowLCR = Data;
 935
 936         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
 937         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 938
 939         Data = 0x0c;
 940         status = 0;
 941         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 942
 943         Data = 0x0;
 944         status = 0;
 945         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 946
 947         Data = 0x00;
 948         status = 0;
 949         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 950
 951         Data = Data & ~SERIAL_LCR_DLAB;
 952         status = 0;
 953         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 954         mos7840_port->shadowLCR = Data;
 955
 956         //clearing Bulkin and Bulkout Fifo
 957         Data = 0x0;
 958         status = 0;
 959         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 960
 961         Data = Data | 0x0c;
 962         status = 0;
 963         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 964
 965         Data = Data & ~0x0c;
 966         status = 0;
 967         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 968         //Finally enable all interrupts
 969         Data = 0x0;
 970         Data = 0x0c;
 971         status = 0;
 972         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 973
 974         //clearing rx_disable
 975         Data = 0x0;
 976         status = 0;
 977         status =
 978             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 979         Data = Data & ~0x20;
 980         status = 0;
 981         status =
 982             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 983
 984         // rx_negate
 985         Data = 0x0;
 986         status = 0;
 987         status =
 988             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 989         Data = Data | 0x10;
 990         status = 0;
 991         status =
 992             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 993
 994         /* force low_latency on so that our tty_push actually forces *
 995          * the data through,otherwise it is scheduled, and with      *
 996          * high data rates (like with OHCI) data can get lost.       */
 997
 998         if (port->tty)
 999                 port->tty->low_latency = 1;
1000 /* Check to see if we've set up our endpoint info yet    *
1001      * (can't set it up in mos7840_startup as the structures *
1002      * were not set up at that time.)                        */
1003         if (port0->open_ports == 1) {
1004                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1005
1006                         /* set up interrupt urb */
1007
1008                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1009                                          serial->dev,
1010                                          usb_rcvintpipe(serial->dev,
1011                                                         serial->port[0]->
1012                                                         interrupt_in_endpointAddress),
1013                                          serial->port[0]->interrupt_in_buffer,
1014                                          serial->port[0]->interrupt_in_urb->
1015                                          transfer_buffer_length,
1016                                          mos7840_interrupt_callback,
1017                                          serial,
1018                                          serial->port[0]->interrupt_in_urb->
1019                                          interval);
1020
1021                         /* start interrupt read for mos7840               *
1022                          * will continue as long as mos7840 is connected  */
1023
1024                         response =
1025                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1026                                            GFP_KERNEL);
1027                         if (response) {
1028                                 err("%s - Error %d submitting interrupt urb",
1029                                     __FUNCTION__, response);
1030                         }
1031
1032                 }
1033
1034         }
1035
1036         /* see if we've set up our endpoint info yet   *
1037          * (can't set it up in mos7840_startup as the  *
1038          * structures were not set up at that time.)   */
1039
1040         dbg("port number is %d \n", port->number);
1041         dbg("serial number is %d \n", port->serial->minor);
1042         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1043         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1044         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1045         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1046         mos7840_port->read_urb = port->read_urb;
1047
1048         /* set up our bulk in urb */
1049
1050         usb_fill_bulk_urb(mos7840_port->read_urb,
1051                           serial->dev,
1052                           usb_rcvbulkpipe(serial->dev,
1053                                           port->bulk_in_endpointAddress),
1054                           port->bulk_in_buffer,
1055                           mos7840_port->read_urb->transfer_buffer_length,
1056                           mos7840_bulk_in_callback, mos7840_port);
1057
1058         dbg("mos7840_open: bulkin endpoint is %d\n",
1059             port->bulk_in_endpointAddress);
1060         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1061         if (response) {
1062                 err("%s - Error %d submitting control urb", __FUNCTION__,
1063                     response);
1064         }
1065
1066         /* initialize our wait queues */
1067         init_waitqueue_head(&mos7840_port->wait_chase);
1068         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1069
1070         /* initialize our icount structure */
1071         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1072
1073         /* initialize our port settings */
1074         mos7840_port->shadowMCR = MCR_MASTER_IE;        /* Must set to enable ints! */
1075         /* send a open port command */
1076         mos7840_port->open = 1;
1077         //mos7840_change_port_settings(mos7840_port,old_termios);
1078         mos7840_port->icount.tx = 0;
1079         mos7840_port->icount.rx = 0;
1080
1081         dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n", serial, mos7840_port, port);
1082
1083         return 0;
1084
1085 }
1086
1087 /*****************************************************************************
1088  * mos7840_chars_in_buffer
1089  *      this function is called by the tty driver when it wants to know how many
1090  *      bytes of data we currently have outstanding in the port (data that has
1091  *      been written, but hasn't made it out the port yet)
1092  *      If successful, we return the number of bytes left to be written in the
1093  *      system,
1094  *      Otherwise we return a negative error number.
1095  *****************************************************************************/
1096
1097 static int mos7840_chars_in_buffer(struct usb_serial_port *port)
1098 {
1099         int i;
1100         int chars = 0;
1101         unsigned long flags;
1102         struct moschip_port *mos7840_port;
1103
1104         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1105
1106         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1107                 dbg("%s", "Invalid port \n");
1108                 return -1;
1109         }
1110
1111         mos7840_port = mos7840_get_port_private(port);
1112         if (mos7840_port == NULL) {
1113                 dbg("%s \n", "mos7840_break:leaving ...........");
1114                 return -1;
1115         }
1116
1117         spin_lock_irqsave(&mos7840_port->pool_lock,flags);
1118         for (i = 0; i < NUM_URBS; ++i) {
1119                 if (mos7840_port->busy[i]) {
1120                         chars += URB_TRANSFER_BUFFER_SIZE;
1121                 }
1122         }
1123         spin_unlock_irqrestore(&mos7840_port->pool_lock,flags);
1124         dbg("%s - returns %d", __FUNCTION__, chars);
1125         return chars;
1126
1127 }
1128
1129 /************************************************************************
1130  *
1131  * mos7840_block_until_tx_empty
1132  *
1133  *      This function will block the close until one of the following:
1134  *              1. TX count are 0
1135  *              2. The mos7840 has stopped
1136  *              3. A timeout of 3 seconds without activity has expired
1137  *
1138  ************************************************************************/
1139 static void mos7840_block_until_tx_empty(struct moschip_port *mos7840_port)
1140 {
1141         int timeout = HZ / 10;
1142         int wait = 30;
1143         int count;
1144
1145         while (1) {
1146
1147                 count = mos7840_chars_in_buffer(mos7840_port->port);
1148
1149                 /* Check for Buffer status */
1150                 if (count <= 0) {
1151                         return;
1152                 }
1153
1154                 /* Block the thread for a while */
1155                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1156                                                timeout);
1157
1158                 /* No activity.. count down section */
1159                 wait--;
1160                 if (wait == 0) {
1161                         dbg("%s - TIMEOUT", __FUNCTION__);
1162                         return;
1163                 } else {
1164                         /* Reset timeout value back to seconds */
1165                         wait = 30;
1166                 }
1167         }
1168 }
1169
1170 /*****************************************************************************
1171  * mos7840_close
1172  *      this function is called by the tty driver when a port is closed
1173  *****************************************************************************/
1174
1175 static void mos7840_close(struct usb_serial_port *port, struct file *filp)
1176 {
1177         struct usb_serial *serial;
1178         struct moschip_port *mos7840_port;
1179         struct moschip_port *port0;
1180         int j;
1181         __u16 Data;
1182
1183         dbg("%s\n", "mos7840_close:entering...");
1184
1185         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1186                 dbg("%s", "Port Paranoia failed \n");
1187                 return;
1188         }
1189
1190         serial = mos7840_get_usb_serial(port, __FUNCTION__);
1191         if (!serial) {
1192                 dbg("%s", "Serial Paranoia failed \n");
1193                 return;
1194         }
1195
1196         mos7840_port = mos7840_get_port_private(port);
1197         port0 = mos7840_get_port_private(serial->port[0]);
1198
1199         if (mos7840_port == NULL || port0 == NULL)
1200                 return;
1201
1202         for (j = 0; j < NUM_URBS; ++j)
1203                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1204
1205         /* Freeing Write URBs */
1206         for (j = 0; j < NUM_URBS; ++j) {
1207                 if (mos7840_port->write_urb_pool[j]) {
1208                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1209                                 kfree(mos7840_port->write_urb_pool[j]->
1210                                       transfer_buffer);
1211
1212                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1213                 }
1214         }
1215
1216         if (serial->dev) {
1217                 /* flush and block until tx is empty */
1218                 mos7840_block_until_tx_empty(mos7840_port);
1219         }
1220
1221         /* While closing port, shutdown all bulk read, write  *
1222          * and interrupt read if they exists                  */
1223         if (serial->dev) {
1224
1225                 if (mos7840_port->write_urb) {
1226                         dbg("%s", "Shutdown bulk write\n");
1227                         usb_kill_urb(mos7840_port->write_urb);
1228                 }
1229
1230                 if (mos7840_port->read_urb) {
1231                         dbg("%s", "Shutdown bulk read\n");
1232                         usb_kill_urb(mos7840_port->read_urb);
1233                 }
1234                 if ((&mos7840_port->control_urb)) {
1235                         dbg("%s", "Shutdown control read\n");
1236                         //      usb_kill_urb (mos7840_port->control_urb);
1237
1238                 }
1239         }
1240 //              if(mos7840_port->ctrl_buf != NULL)
1241 //                      kfree(mos7840_port->ctrl_buf);
1242         port0->open_ports--;
1243         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1244             port0->open_ports, port->number);
1245         if (port0->open_ports == 0) {
1246                 if (serial->port[0]->interrupt_in_urb) {
1247                         dbg("%s", "Shutdown interrupt_in_urb\n");
1248                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1249                 }
1250         }
1251
1252         if (mos7840_port->write_urb) {
1253                 /* if this urb had a transfer buffer already (old tx) free it */
1254
1255                 if (mos7840_port->write_urb->transfer_buffer != NULL) {
1256                         kfree(mos7840_port->write_urb->transfer_buffer);
1257                 }
1258                 usb_free_urb(mos7840_port->write_urb);
1259         }
1260
1261         Data = 0x0;
1262         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1263
1264         Data = 0x00;
1265         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1266
1267         mos7840_port->open = 0;
1268
1269         dbg("%s \n", "Leaving ............");
1270 }
1271
1272 /************************************************************************
1273  *
1274  * mos7840_block_until_chase_response
1275  *
1276  *      This function will block the close until one of the following:
1277  *              1. Response to our Chase comes from mos7840
1278  *              2. A timeout of 10 seconds without activity has expired
1279  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1280  *
1281  ************************************************************************/
1282
1283 static void mos7840_block_until_chase_response(struct moschip_port
1284                                                *mos7840_port)
1285 {
1286         int timeout = 1 * HZ;
1287         int wait = 10;
1288         int count;
1289
1290         while (1) {
1291                 count = mos7840_chars_in_buffer(mos7840_port->port);
1292
1293                 /* Check for Buffer status */
1294                 if (count <= 0) {
1295                         return;
1296                 }
1297
1298                 /* Block the thread for a while */
1299                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1300                                                timeout);
1301                 /* No activity.. count down section */
1302                 wait--;
1303                 if (wait == 0) {
1304                         dbg("%s - TIMEOUT", __FUNCTION__);
1305                         return;
1306                 } else {
1307                         /* Reset timeout value back to seconds */
1308                         wait = 10;
1309                 }
1310         }
1311
1312 }
1313
1314 /*****************************************************************************
1315  * mos7840_break
1316  *      this function sends a break to the port
1317  *****************************************************************************/
1318 static void mos7840_break(struct usb_serial_port *port, int break_state)
1319 {
1320         unsigned char data;
1321         struct usb_serial *serial;
1322         struct moschip_port *mos7840_port;
1323
1324         dbg("%s \n", "Entering ...........");
1325         dbg("mos7840_break: Start\n");
1326
1327         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1328                 dbg("%s", "Port Paranoia failed \n");
1329                 return;
1330         }
1331
1332         serial = mos7840_get_usb_serial(port, __FUNCTION__);
1333         if (!serial) {
1334                 dbg("%s", "Serial Paranoia failed \n");
1335                 return;
1336         }
1337
1338         mos7840_port = mos7840_get_port_private(port);
1339
1340         if (mos7840_port == NULL) {
1341                 return;
1342         }
1343
1344         if (serial->dev) {
1345
1346                 /* flush and block until tx is empty */
1347                 mos7840_block_until_chase_response(mos7840_port);
1348         }
1349
1350         if (break_state == -1) {
1351                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1352         } else {
1353                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1354         }
1355
1356         mos7840_port->shadowLCR = data;
1357         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1358             mos7840_port->shadowLCR);
1359         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1360                              mos7840_port->shadowLCR);
1361
1362         return;
1363 }
1364
1365 /*****************************************************************************
1366  * mos7840_write_room
1367  *      this function is called by the tty driver when it wants to know how many
1368  *      bytes of data we can accept for a specific port.
1369  *      If successful, we return the amount of room that we have for this port
1370  *      Otherwise we return a negative error number.
1371  *****************************************************************************/
1372
1373 static int mos7840_write_room(struct usb_serial_port *port)
1374 {
1375         int i;
1376         int room = 0;
1377         unsigned long flags;
1378         struct moschip_port *mos7840_port;
1379
1380         dbg("%s \n", " mos7840_write_room:entering ...........");
1381
1382         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1383                 dbg("%s", "Invalid port \n");
1384                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1385                 return -1;
1386         }
1387
1388         mos7840_port = mos7840_get_port_private(port);
1389         if (mos7840_port == NULL) {
1390                 dbg("%s \n", "mos7840_break:leaving ...........");
1391                 return -1;
1392         }
1393
1394         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1395         for (i = 0; i < NUM_URBS; ++i) {
1396                 if (!mos7840_port->busy[i]) {
1397                         room += URB_TRANSFER_BUFFER_SIZE;
1398                 }
1399         }
1400         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1401
1402         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1403         dbg("%s - returns %d", __FUNCTION__, room);
1404         return room;
1405
1406 }
1407
1408 /*****************************************************************************
1409  * mos7840_write
1410  *      this function is called by the tty driver when data should be written to
1411  *      the port.
1412  *      If successful, we return the number of bytes written, otherwise we
1413  *      return a negative error number.
1414  *****************************************************************************/
1415
1416 static int mos7840_write(struct usb_serial_port *port,
1417                          const unsigned char *data, int count)
1418 {
1419         int status;
1420         int i;
1421         int bytes_sent = 0;
1422         int transfer_size;
1423         unsigned long flags;
1424
1425         struct moschip_port *mos7840_port;
1426         struct usb_serial *serial;
1427         struct urb *urb;
1428         //__u16 Data;
1429         const unsigned char *current_position = data;
1430         unsigned char *data1;
1431         dbg("%s \n", "entering ...........");
1432         //dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",mos7840_port->shadowLCR);
1433
1434 #ifdef NOTMOS7840
1435         Data = 0x00;
1436         status = 0;
1437         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1438         mos7840_port->shadowLCR = Data;
1439         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1440         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1441             mos7840_port->shadowLCR);
1442
1443         //Data = 0x03;
1444         //status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data);
1445         //mos7840_port->shadowLCR=Data;//Need to add later
1446
1447         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
1448         status = 0;
1449         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1450
1451         //Data = 0x0c;
1452         //status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data);
1453         Data = 0x00;
1454         status = 0;
1455         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1456         dbg("mos7840_write:DLL value is %x\n", Data);
1457
1458         Data = 0x0;
1459         status = 0;
1460         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1461         dbg("mos7840_write:DLM value is %x\n", Data);
1462
1463         Data = Data & ~SERIAL_LCR_DLAB;
1464         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1465             mos7840_port->shadowLCR);
1466         status = 0;
1467         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1468 #endif
1469
1470         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1471                 dbg("%s", "Port Paranoia failed \n");
1472                 return -1;
1473         }
1474
1475         serial = port->serial;
1476         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
1477                 dbg("%s", "Serial Paranoia failed \n");
1478                 return -1;
1479         }
1480
1481         mos7840_port = mos7840_get_port_private(port);
1482         if (mos7840_port == NULL) {
1483                 dbg("%s", "mos7840_port is NULL\n");
1484                 return -1;
1485         }
1486
1487         /* try to find a free urb in the list */
1488         urb = NULL;
1489
1490         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1491         for (i = 0; i < NUM_URBS; ++i) {
1492                 if (!mos7840_port->busy[i]) {
1493                         mos7840_port->busy[i] = 1;
1494                         urb = mos7840_port->write_urb_pool[i];
1495                         dbg("\nURB:%d", i);
1496                         break;
1497                 }
1498         }
1499         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1500
1501         if (urb == NULL) {
1502                 dbg("%s - no more free urbs", __FUNCTION__);
1503                 goto exit;
1504         }
1505
1506         if (urb->transfer_buffer == NULL) {
1507                 urb->transfer_buffer =
1508                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1509
1510                 if (urb->transfer_buffer == NULL) {
1511                         err("%s no more kernel memory...", __FUNCTION__);
1512                         goto exit;
1513                 }
1514         }
1515         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1516
1517         memcpy(urb->transfer_buffer, current_position, transfer_size);
1518
1519         /* fill urb with data and submit  */
1520         usb_fill_bulk_urb(urb,
1521                           serial->dev,
1522                           usb_sndbulkpipe(serial->dev,
1523                                           port->bulk_out_endpointAddress),
1524                           urb->transfer_buffer,
1525                           transfer_size,
1526                           mos7840_bulk_out_data_callback, mos7840_port);
1527
1528         data1 = urb->transfer_buffer;
1529         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1530
1531         /* send it down the pipe */
1532         status = usb_submit_urb(urb, GFP_ATOMIC);
1533
1534         if (status) {
1535                 mos7840_port->busy[i] = 0;
1536                 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1537                     __FUNCTION__, status);
1538                 bytes_sent = status;
1539                 goto exit;
1540         }
1541         bytes_sent = transfer_size;
1542         mos7840_port->icount.tx += transfer_size;
1543         smp_wmb();
1544         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1545       exit:
1546
1547         return bytes_sent;
1548
1549 }
1550
1551 /*****************************************************************************
1552  * mos7840_throttle
1553  *      this function is called by the tty driver when it wants to stop the data
1554  *      being read from the port.
1555  *****************************************************************************/
1556
1557 static void mos7840_throttle(struct usb_serial_port *port)
1558 {
1559         struct moschip_port *mos7840_port;
1560         struct tty_struct *tty;
1561         int status;
1562
1563         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1564                 dbg("%s", "Invalid port \n");
1565                 return;
1566         }
1567
1568         dbg("- port %d\n", port->number);
1569
1570         mos7840_port = mos7840_get_port_private(port);
1571
1572         if (mos7840_port == NULL)
1573                 return;
1574
1575         if (!mos7840_port->open) {
1576                 dbg("%s\n", "port not opened");
1577                 return;
1578         }
1579
1580         dbg("%s", "Entering .......... \n");
1581
1582         tty = port->tty;
1583         if (!tty) {
1584                 dbg("%s - no tty available", __FUNCTION__);
1585                 return;
1586         }
1587
1588         /* if we are implementing XON/XOFF, send the stop character */
1589         if (I_IXOFF(tty)) {
1590                 unsigned char stop_char = STOP_CHAR(tty);
1591                 status = mos7840_write(port, &stop_char, 1);
1592                 if (status <= 0) {
1593                         return;
1594                 }
1595         }
1596
1597         /* if we are implementing RTS/CTS, toggle that line */
1598         if (tty->termios->c_cflag & CRTSCTS) {
1599                 mos7840_port->shadowMCR &= ~MCR_RTS;
1600                 status = 0;
1601                 status =
1602                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1603                                          mos7840_port->shadowMCR);
1604
1605                 if (status < 0) {
1606                         return;
1607                 }
1608         }
1609
1610         return;
1611 }
1612
1613 /*****************************************************************************
1614  * mos7840_unthrottle
1615  *      this function is called by the tty driver when it wants to resume the data
1616  *      being read from the port (called after SerialThrottle is called)
1617  *****************************************************************************/
1618 static void mos7840_unthrottle(struct usb_serial_port *port)
1619 {
1620         struct tty_struct *tty;
1621         int status;
1622         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1623
1624         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1625                 dbg("%s", "Invalid port \n");
1626                 return;
1627         }
1628
1629         if (mos7840_port == NULL)
1630                 return;
1631
1632         if (!mos7840_port->open) {
1633                 dbg("%s - port not opened", __FUNCTION__);
1634                 return;
1635         }
1636
1637         dbg("%s", "Entering .......... \n");
1638
1639         tty = port->tty;
1640         if (!tty) {
1641                 dbg("%s - no tty available", __FUNCTION__);
1642                 return;
1643         }
1644
1645         /* if we are implementing XON/XOFF, send the start character */
1646         if (I_IXOFF(tty)) {
1647                 unsigned char start_char = START_CHAR(tty);
1648                 status = mos7840_write(port, &start_char, 1);
1649                 if (status <= 0) {
1650                         return;
1651                 }
1652         }
1653
1654         /* if we are implementing RTS/CTS, toggle that line */
1655         if (tty->termios->c_cflag & CRTSCTS) {
1656                 mos7840_port->shadowMCR |= MCR_RTS;
1657                 status = 0;
1658                 status =
1659                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1660                                          mos7840_port->shadowMCR);
1661                 if (status < 0) {
1662                         return;
1663                 }
1664         }
1665
1666         return;
1667 }
1668
1669 static int mos7840_tiocmget(struct usb_serial_port *port, struct file *file)
1670 {
1671         struct moschip_port *mos7840_port;
1672         unsigned int result;
1673         __u16 msr;
1674         __u16 mcr;
1675         int status = 0;
1676         mos7840_port = mos7840_get_port_private(port);
1677
1678         dbg("%s - port %d", __FUNCTION__, port->number);
1679
1680         if (mos7840_port == NULL)
1681                 return -ENODEV;
1682
1683         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1684         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1685         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1686             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1687             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1688             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1689             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1690             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1691             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1692
1693         dbg("%s - 0x%04X", __FUNCTION__, result);
1694
1695         return result;
1696 }
1697
1698 static int mos7840_tiocmset(struct usb_serial_port *port, struct file *file,
1699                             unsigned int set, unsigned int clear)
1700 {
1701         struct moschip_port *mos7840_port;
1702         unsigned int mcr;
1703         unsigned int status;
1704
1705         dbg("%s - port %d", __FUNCTION__, port->number);
1706
1707         mos7840_port = mos7840_get_port_private(port);
1708
1709         if (mos7840_port == NULL)
1710                 return -ENODEV;
1711
1712         mcr = mos7840_port->shadowMCR;
1713         if (clear & TIOCM_RTS)
1714                 mcr &= ~MCR_RTS;
1715         if (clear & TIOCM_DTR)
1716                 mcr &= ~MCR_DTR;
1717         if (clear & TIOCM_LOOP)
1718                 mcr &= ~MCR_LOOPBACK;
1719
1720         if (set & TIOCM_RTS)
1721                 mcr |= MCR_RTS;
1722         if (set & TIOCM_DTR)
1723                 mcr |= MCR_DTR;
1724         if (set & TIOCM_LOOP)
1725                 mcr |= MCR_LOOPBACK;
1726
1727         mos7840_port->shadowMCR = mcr;
1728
1729         status = 0;
1730         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1731         if (status < 0) {
1732                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1733                 return -1;
1734         }
1735
1736         return 0;
1737 }
1738
1739 /*****************************************************************************
1740  * mos7840_calc_baud_rate_divisor
1741  *      this function calculates the proper baud rate divisor for the specified
1742  *      baud rate.
1743  *****************************************************************************/
1744 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1745                                           __u16 * clk_sel_val)
1746 {
1747
1748         dbg("%s - %d", __FUNCTION__, baudRate);
1749
1750         if (baudRate <= 115200) {
1751                 *divisor = 115200 / baudRate;
1752                 *clk_sel_val = 0x0;
1753         }
1754         if ((baudRate > 115200) && (baudRate <= 230400)) {
1755                 *divisor = 230400 / baudRate;
1756                 *clk_sel_val = 0x10;
1757         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1758                 *divisor = 403200 / baudRate;
1759                 *clk_sel_val = 0x20;
1760         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1761                 *divisor = 460800 / baudRate;
1762                 *clk_sel_val = 0x30;
1763         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1764                 *divisor = 806400 / baudRate;
1765                 *clk_sel_val = 0x40;
1766         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1767                 *divisor = 921600 / baudRate;
1768                 *clk_sel_val = 0x50;
1769         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1770                 *divisor = 1572864 / baudRate;
1771                 *clk_sel_val = 0x60;
1772         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1773                 *divisor = 3145728 / baudRate;
1774                 *clk_sel_val = 0x70;
1775         }
1776         return 0;
1777
1778 #ifdef NOTMCS7840
1779
1780         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1781                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1782                         *divisor = mos7840_divisor_table[i].Divisor;
1783                         return 0;
1784                 }
1785         }
1786
1787         /* After trying for all the standard baud rates    *
1788          * Try calculating the divisor for this baud rate  */
1789
1790         if (baudrate > 75 && baudrate < 230400) {
1791                 /* get the divisor */
1792                 custom = (__u16) (230400L / baudrate);
1793
1794                 /* Check for round off */
1795                 round1 = (__u16) (2304000L / baudrate);
1796                 round = (__u16) (round1 - (custom * 10));
1797                 if (round > 4) {
1798                         custom++;
1799                 }
1800                 *divisor = custom;
1801
1802                 dbg(" Baud %d = %d\n", baudrate, custom);
1803                 return 0;
1804         }
1805
1806         dbg("%s\n", " Baud calculation Failed...");
1807         return -1;
1808 #endif
1809 }
1810
1811 /*****************************************************************************
1812  * mos7840_send_cmd_write_baud_rate
1813  *      this function sends the proper command to change the baud rate of the
1814  *      specified port.
1815  *****************************************************************************/
1816
1817 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1818                                             int baudRate)
1819 {
1820         int divisor = 0;
1821         int status;
1822         __u16 Data;
1823         unsigned char number;
1824         __u16 clk_sel_val;
1825         struct usb_serial_port *port;
1826
1827         if (mos7840_port == NULL)
1828                 return -1;
1829
1830         port = (struct usb_serial_port *)mos7840_port->port;
1831         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1832                 dbg("%s", "Invalid port \n");
1833                 return -1;
1834         }
1835
1836         if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1837                 dbg("%s", "Invalid Serial \n");
1838                 return -1;
1839         }
1840
1841         dbg("%s", "Entering .......... \n");
1842
1843         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1844
1845         dbg("%s - port = %d, baud = %d", __FUNCTION__,
1846             mos7840_port->port->number, baudRate);
1847         //reset clk_uart_sel in spregOffset
1848         if (baudRate > 115200) {
1849 #ifdef HW_flow_control
1850                 //NOTE: need to see the pther register to modify
1851                 //setting h/w flow control bit to 1;
1852                 status = 0;
1853                 Data = 0x2b;
1854                 mos7840_port->shadowMCR = Data;
1855                 status =
1856                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1857                 if (status < 0) {
1858                         dbg("Writing spreg failed in set_serial_baud\n");
1859                         return -1;
1860                 }
1861 #endif
1862
1863         } else {
1864 #ifdef HW_flow_control
1865                 //setting h/w flow control bit to 0;
1866                 status = 0;
1867                 Data = 0xb;
1868                 mos7840_port->shadowMCR = Data;
1869                 status =
1870                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1871                 if (status < 0) {
1872                         dbg("Writing spreg failed in set_serial_baud\n");
1873                         return -1;
1874                 }
1875 #endif
1876
1877         }
1878
1879         if (1)                  //baudRate <= 115200)
1880         {
1881                 clk_sel_val = 0x0;
1882                 Data = 0x0;
1883                 status = 0;
1884                 status =
1885                     mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1886                                                    &clk_sel_val);
1887                 status =
1888                     mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1889                                          &Data);
1890                 if (status < 0) {
1891                         dbg("reading spreg failed in set_serial_baud\n");
1892                         return -1;
1893                 }
1894                 Data = (Data & 0x8f) | clk_sel_val;
1895                 status = 0;
1896                 status =
1897                     mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1898                 if (status < 0) {
1899                         dbg("Writing spreg failed in set_serial_baud\n");
1900                         return -1;
1901                 }
1902                 /* Calculate the Divisor */
1903
1904                 if (status) {
1905                         err("%s - bad baud rate", __FUNCTION__);
1906                         dbg("%s\n", "bad baud rate");
1907                         return status;
1908                 }
1909                 /* Enable access to divisor latch */
1910                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1911                 mos7840_port->shadowLCR = Data;
1912                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1913
1914                 /* Write the divisor */
1915                 Data = (unsigned char)(divisor & 0xff);
1916                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1917                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1918
1919                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1920                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1921                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1922
1923                 /* Disable access to divisor latch */
1924                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1925                 mos7840_port->shadowLCR = Data;
1926                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1927
1928         }
1929
1930         return status;
1931 }
1932
1933 /*****************************************************************************
1934  * mos7840_change_port_settings
1935  *      This routine is called to set the UART on the device to match
1936  *      the specified new settings.
1937  *****************************************************************************/
1938
1939 static void mos7840_change_port_settings(struct moschip_port *mos7840_port,
1940                                          struct ktermios *old_termios)
1941 {
1942         struct tty_struct *tty;
1943         int baud;
1944         unsigned cflag;
1945         unsigned iflag;
1946         __u8 lData;
1947         __u8 lParity;
1948         __u8 lStop;
1949         int status;
1950         __u16 Data;
1951         struct usb_serial_port *port;
1952         struct usb_serial *serial;
1953
1954         if (mos7840_port == NULL)
1955                 return;
1956
1957         port = (struct usb_serial_port *)mos7840_port->port;
1958
1959         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1960                 dbg("%s", "Invalid port \n");
1961                 return;
1962         }
1963
1964         if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1965                 dbg("%s", "Invalid Serial \n");
1966                 return;
1967         }
1968
1969         serial = port->serial;
1970
1971         dbg("%s - port %d", __FUNCTION__, mos7840_port->port->number);
1972
1973         if (!mos7840_port->open) {
1974                 dbg("%s - port not opened", __FUNCTION__);
1975                 return;
1976         }
1977
1978         tty = mos7840_port->port->tty;
1979
1980         dbg("%s", "Entering .......... \n");
1981
1982         lData = LCR_BITS_8;
1983         lStop = LCR_STOP_1;
1984         lParity = LCR_PAR_NONE;
1985
1986         cflag = tty->termios->c_cflag;
1987         iflag = tty->termios->c_iflag;
1988
1989         /* Change the number of bits */
1990         if (cflag & CSIZE) {
1991                 switch (cflag & CSIZE) {
1992                 case CS5:
1993                         lData = LCR_BITS_5;
1994                         break;
1995
1996                 case CS6:
1997                         lData = LCR_BITS_6;
1998                         break;
1999
2000                 case CS7:
2001                         lData = LCR_BITS_7;
2002                         break;
2003                 default:
2004                 case CS8:
2005                         lData = LCR_BITS_8;
2006                         break;
2007                 }
2008         }
2009         /* Change the Parity bit */
2010         if (cflag & PARENB) {
2011                 if (cflag & PARODD) {
2012                         lParity = LCR_PAR_ODD;
2013                         dbg("%s - parity = odd", __FUNCTION__);
2014                 } else {
2015                         lParity = LCR_PAR_EVEN;
2016                         dbg("%s - parity = even", __FUNCTION__);
2017                 }
2018
2019         } else {
2020                 dbg("%s - parity = none", __FUNCTION__);
2021         }
2022
2023         if (cflag & CMSPAR) {
2024                 lParity = lParity | 0x20;
2025         }
2026
2027         /* Change the Stop bit */
2028         if (cflag & CSTOPB) {
2029                 lStop = LCR_STOP_2;
2030                 dbg("%s - stop bits = 2", __FUNCTION__);
2031         } else {
2032                 lStop = LCR_STOP_1;
2033                 dbg("%s - stop bits = 1", __FUNCTION__);
2034         }
2035
2036         /* Update the LCR with the correct value */
2037         mos7840_port->shadowLCR &=
2038             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2039         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2040
2041         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2042             mos7840_port->shadowLCR);
2043         /* Disable Interrupts */
2044         Data = 0x00;
2045         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2046
2047         Data = 0x00;
2048         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2049
2050         Data = 0xcf;
2051         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2052
2053         /* Send the updated LCR value to the mos7840 */
2054         Data = mos7840_port->shadowLCR;
2055
2056         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2057
2058         Data = 0x00b;
2059         mos7840_port->shadowMCR = Data;
2060         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2061         Data = 0x00b;
2062         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2063
2064         /* set up the MCR register and send it to the mos7840 */
2065
2066         mos7840_port->shadowMCR = MCR_MASTER_IE;
2067         if (cflag & CBAUD) {
2068                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2069         }
2070
2071         if (cflag & CRTSCTS) {
2072                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2073
2074         } else {
2075                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2076         }
2077
2078         Data = mos7840_port->shadowMCR;
2079         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2080
2081         /* Determine divisor based on baud rate */
2082         baud = tty_get_baud_rate(tty);
2083
2084         if (!baud) {
2085                 /* pick a default, any default... */
2086                 dbg("%s\n", "Picked default baud...");
2087                 baud = 9600;
2088         }
2089
2090         dbg("%s - baud rate = %d", __FUNCTION__, baud);
2091         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2092
2093         /* Enable Interrupts */
2094         Data = 0x0c;
2095         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2096
2097         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2098                 mos7840_port->read_urb->dev = serial->dev;
2099
2100                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2101
2102                 if (status) {
2103                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2104                             status);
2105                 }
2106         }
2107         wake_up(&mos7840_port->delta_msr_wait);
2108         mos7840_port->delta_msr_cond = 1;
2109         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2110             mos7840_port->shadowLCR);
2111
2112         return;
2113 }
2114
2115 /*****************************************************************************
2116  * mos7840_set_termios
2117  *      this function is called by the tty driver when it wants to change
2118  *      the termios structure
2119  *****************************************************************************/
2120
2121 static void mos7840_set_termios(struct usb_serial_port *port,
2122                                 struct ktermios *old_termios)
2123 {
2124         int status;
2125         unsigned int cflag;
2126         struct usb_serial *serial;
2127         struct moschip_port *mos7840_port;
2128         struct tty_struct *tty;
2129         dbg("mos7840_set_termios: START\n");
2130         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2131                 dbg("%s", "Invalid port \n");
2132                 return;
2133         }
2134
2135         serial = port->serial;
2136
2137         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
2138                 dbg("%s", "Invalid Serial \n");
2139                 return;
2140         }
2141
2142         mos7840_port = mos7840_get_port_private(port);
2143
2144         if (mos7840_port == NULL)
2145                 return;
2146
2147         tty = port->tty;
2148
2149         if (!mos7840_port->open) {
2150                 dbg("%s - port not opened", __FUNCTION__);
2151                 return;
2152         }
2153
2154         dbg("%s\n", "setting termios - ");
2155
2156         cflag = tty->termios->c_cflag;
2157
2158         dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
2159             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2160         dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
2161             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2162         dbg("%s - port %d", __FUNCTION__, port->number);
2163
2164         /* change the port settings to the new ones specified */
2165
2166         mos7840_change_port_settings(mos7840_port, old_termios);
2167
2168         if (!mos7840_port->read_urb) {
2169                 dbg("%s", "URB KILLED !!!!!\n");
2170                 return;
2171         }
2172
2173         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2174                 mos7840_port->read_urb->dev = serial->dev;
2175                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2176                 if (status) {
2177                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2178                             status);
2179                 }
2180         }
2181         return;
2182 }
2183
2184 /*****************************************************************************
2185  * mos7840_get_lsr_info - get line status register info
2186  *
2187  * Purpose: Let user call ioctl() to get info when the UART physically
2188  *          is emptied.  On bus types like RS485, the transmitter must
2189  *          release the bus after transmitting. This must be done when
2190  *          the transmit shift register is empty, not be done when the
2191  *          transmit holding register is empty.  This functionality
2192  *          allows an RS485 driver to be written in user space.
2193  *****************************************************************************/
2194
2195 static int mos7840_get_lsr_info(struct moschip_port *mos7840_port,
2196                                 unsigned int __user *value)
2197 {
2198         int count;
2199         unsigned int result = 0;
2200
2201         count = mos7840_chars_in_buffer(mos7840_port->port);
2202         if (count == 0) {
2203                 dbg("%s -- Empty", __FUNCTION__);
2204                 result = TIOCSER_TEMT;
2205         }
2206
2207         if (copy_to_user(value, &result, sizeof(int)))
2208                 return -EFAULT;
2209         return 0;
2210 }
2211
2212 /*****************************************************************************
2213  * mos7840_set_modem_info
2214  *      function to set modem info
2215  *****************************************************************************/
2216
2217 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2218                                   unsigned int cmd, unsigned int __user *value)
2219 {
2220         unsigned int mcr;
2221         unsigned int arg;
2222         __u16 Data;
2223         int status;
2224         struct usb_serial_port *port;
2225
2226         if (mos7840_port == NULL)
2227                 return -1;
2228
2229         port = (struct usb_serial_port *)mos7840_port->port;
2230         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2231                 dbg("%s", "Invalid port \n");
2232                 return -1;
2233         }
2234
2235         mcr = mos7840_port->shadowMCR;
2236
2237         if (copy_from_user(&arg, value, sizeof(int)))
2238                 return -EFAULT;
2239
2240         switch (cmd) {
2241         case TIOCMBIS:
2242                 if (arg & TIOCM_RTS)
2243                         mcr |= MCR_RTS;
2244                 if (arg & TIOCM_DTR)
2245                         mcr |= MCR_RTS;
2246                 if (arg & TIOCM_LOOP)
2247                         mcr |= MCR_LOOPBACK;
2248                 break;
2249
2250         case TIOCMBIC:
2251                 if (arg & TIOCM_RTS)
2252                         mcr &= ~MCR_RTS;
2253                 if (arg & TIOCM_DTR)
2254                         mcr &= ~MCR_RTS;
2255                 if (arg & TIOCM_LOOP)
2256                         mcr &= ~MCR_LOOPBACK;
2257                 break;
2258
2259         case TIOCMSET:
2260                 /* turn off the RTS and DTR and LOOPBACK
2261                  * and then only turn on what was asked to */
2262                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2263                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2264                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2265                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2266                 break;
2267         }
2268
2269         mos7840_port->shadowMCR = mcr;
2270
2271         Data = mos7840_port->shadowMCR;
2272         status = 0;
2273         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2274         if (status < 0) {
2275                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2276                 return -1;
2277         }
2278
2279         return 0;
2280 }
2281
2282 /*****************************************************************************
2283  * mos7840_get_modem_info
2284  *      function to get modem info
2285  *****************************************************************************/
2286
2287 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2288                                   unsigned int __user *value)
2289 {
2290         unsigned int result = 0;
2291         __u16 msr;
2292         unsigned int mcr = mos7840_port->shadowMCR;
2293         int status = 0;
2294         status =
2295             mos7840_get_uart_reg(mos7840_port->port, MODEM_STATUS_REGISTER,
2296                                  &msr);
2297         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2298             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2299             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2300             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2301             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2302             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2303
2304         dbg("%s -- %x", __FUNCTION__, result);
2305
2306         if (copy_to_user(value, &result, sizeof(int)))
2307                 return -EFAULT;
2308         return 0;
2309 }
2310
2311 /*****************************************************************************
2312  * mos7840_get_serial_info
2313  *      function to get information about serial port
2314  *****************************************************************************/
2315
2316 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2317                                    struct serial_struct __user *retinfo)
2318 {
2319         struct serial_struct tmp;
2320
2321         if (mos7840_port == NULL)
2322                 return -1;
2323
2324         if (!retinfo)
2325                 return -EFAULT;
2326
2327         memset(&tmp, 0, sizeof(tmp));
2328
2329         tmp.type = PORT_16550A;
2330         tmp.line = mos7840_port->port->serial->minor;
2331         tmp.port = mos7840_port->port->number;
2332         tmp.irq = 0;
2333         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2334         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2335         tmp.baud_base = 9600;
2336         tmp.close_delay = 5 * HZ;
2337         tmp.closing_wait = 30 * HZ;
2338
2339         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2340                 return -EFAULT;
2341         return 0;
2342 }
2343
2344 /*****************************************************************************
2345  * SerialIoctl
2346  *      this function handles any ioctl calls to the driver
2347  *****************************************************************************/
2348
2349 static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
2350                          unsigned int cmd, unsigned long arg)
2351 {
2352         void __user *argp = (void __user *)arg;
2353         struct moschip_port *mos7840_port;
2354         struct tty_struct *tty;
2355
2356         struct async_icount cnow;
2357         struct async_icount cprev;
2358         struct serial_icounter_struct icount;
2359         int mosret = 0;
2360
2361         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2362                 dbg("%s", "Invalid port \n");
2363                 return -1;
2364         }
2365
2366         mos7840_port = mos7840_get_port_private(port);
2367
2368         if (mos7840_port == NULL)
2369                 return -1;
2370
2371         tty = mos7840_port->port->tty;
2372
2373         dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
2374
2375         switch (cmd) {
2376                 /* return number of bytes available */
2377
2378         case TIOCSERGETLSR:
2379                 dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__, port->number);
2380                 return mos7840_get_lsr_info(mos7840_port, argp);
2381                 return 0;
2382
2383         case TIOCMBIS:
2384         case TIOCMBIC:
2385         case TIOCMSET:
2386                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,
2387                     port->number);
2388                 mosret =
2389                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2390                 return mosret;
2391
2392         case TIOCMGET:
2393                 dbg("%s (%d) TIOCMGET", __FUNCTION__, port->number);
2394                 return mos7840_get_modem_info(mos7840_port, argp);
2395
2396         case TIOCGSERIAL:
2397                 dbg("%s (%d) TIOCGSERIAL", __FUNCTION__, port->number);
2398                 return mos7840_get_serial_info(mos7840_port, argp);
2399
2400         case TIOCSSERIAL:
2401                 dbg("%s (%d) TIOCSSERIAL", __FUNCTION__, port->number);
2402                 break;
2403
2404         case TIOCMIWAIT:
2405                 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
2406                 cprev = mos7840_port->icount;
2407                 while (1) {
2408                         //interruptible_sleep_on(&mos7840_port->delta_msr_wait);
2409                         mos7840_port->delta_msr_cond = 0;
2410                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2411                                                  (mos7840_port->
2412                                                   delta_msr_cond == 1));
2413
2414                         /* see if a signal did it */
2415                         if (signal_pending(current))
2416                                 return -ERESTARTSYS;
2417                         cnow = mos7840_port->icount;
2418                         smp_rmb();
2419                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2420                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2421                                 return -EIO;    /* no change => error */
2422                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2423                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2424                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2425                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2426                                 return 0;
2427                         }
2428                         cprev = cnow;
2429                 }
2430                 /* NOTREACHED */
2431                 break;
2432
2433         case TIOCGICOUNT:
2434                 cnow = mos7840_port->icount;
2435                 smp_rmb();
2436                 icount.cts = cnow.cts;
2437                 icount.dsr = cnow.dsr;
2438                 icount.rng = cnow.rng;
2439                 icount.dcd = cnow.dcd;
2440                 icount.rx = cnow.rx;
2441                 icount.tx = cnow.tx;
2442                 icount.frame = cnow.frame;
2443                 icount.overrun = cnow.overrun;
2444                 icount.parity = cnow.parity;
2445                 icount.brk = cnow.brk;
2446                 icount.buf_overrun = cnow.buf_overrun;
2447
2448                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,
2449                     port->number, icount.rx, icount.tx);
2450                 if (copy_to_user(argp, &icount, sizeof(icount)))
2451                         return -EFAULT;
2452                 return 0;
2453
2454         case TIOCEXBAUD:
2455                 return 0;
2456         default:
2457                 break;
2458         }
2459
2460         return -ENOIOCTLCMD;
2461 }
2462
2463 static int mos7840_calc_num_ports(struct usb_serial *serial)
2464 {
2465         int mos7840_num_ports = 0;
2466
2467         dbg("numberofendpoints: %d \n",
2468             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2469         dbg("numberofendpoints: %d \n",
2470             (int)serial->interface->altsetting->desc.bNumEndpoints);
2471         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2472                 mos7840_num_ports = serial->num_ports = 2;
2473         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2474                 serial->num_bulk_in = 4;
2475                 serial->num_bulk_out = 4;
2476                 mos7840_num_ports = serial->num_ports = 4;
2477         }
2478
2479         return mos7840_num_ports;
2480 }
2481
2482 /****************************************************************************
2483  * mos7840_startup
2484  ****************************************************************************/
2485
2486 static int mos7840_startup(struct usb_serial *serial)
2487 {
2488         struct moschip_port *mos7840_port;
2489         struct usb_device *dev;
2490         int i, status;
2491
2492         __u16 Data;
2493         dbg("%s \n", " mos7840_startup :entering..........");
2494
2495         if (!serial) {
2496                 dbg("%s\n", "Invalid Handler");
2497                 return -1;
2498         }
2499
2500         dev = serial->dev;
2501
2502         dbg("%s\n", "Entering...");
2503
2504         /* we set up the pointers to the endpoints in the mos7840_open *
2505          * function, as the structures aren't created yet.             */
2506
2507         /* set up port private structures */
2508         for (i = 0; i < serial->num_ports; ++i) {
2509                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2510                 if (mos7840_port == NULL) {
2511                         err("%s - Out of memory", __FUNCTION__);
2512                         status = -ENOMEM;
2513                         i--; /* don't follow NULL pointer cleaning up */
2514                         goto error;
2515                 }
2516
2517                 /* Initialize all port interrupt end point to port 0 int endpoint *
2518                  * Our device has only one interrupt end point comman to all port */
2519
2520                 mos7840_port->port = serial->port[i];
2521                 mos7840_set_port_private(serial->port[i], mos7840_port);
2522                 spin_lock_init(&mos7840_port->pool_lock);
2523
2524                 mos7840_port->port_num = ((serial->port[i]->number -
2525                                            (serial->port[i]->serial->minor)) +
2526                                           1);
2527
2528                 if (mos7840_port->port_num == 1) {
2529                         mos7840_port->SpRegOffset = 0x0;
2530                         mos7840_port->ControlRegOffset = 0x1;
2531                         mos7840_port->DcrRegOffset = 0x4;
2532                 } else if ((mos7840_port->port_num == 2)
2533                            && (serial->num_ports == 4)) {
2534                         mos7840_port->SpRegOffset = 0x8;
2535                         mos7840_port->ControlRegOffset = 0x9;
2536                         mos7840_port->DcrRegOffset = 0x16;
2537                 } else if ((mos7840_port->port_num == 2)
2538                            && (serial->num_ports == 2)) {
2539                         mos7840_port->SpRegOffset = 0xa;
2540                         mos7840_port->ControlRegOffset = 0xb;
2541                         mos7840_port->DcrRegOffset = 0x19;
2542                 } else if ((mos7840_port->port_num == 3)
2543                            && (serial->num_ports == 4)) {
2544                         mos7840_port->SpRegOffset = 0xa;
2545                         mos7840_port->ControlRegOffset = 0xb;
2546                         mos7840_port->DcrRegOffset = 0x19;
2547                 } else if ((mos7840_port->port_num == 4)
2548                            && (serial->num_ports == 4)) {
2549                         mos7840_port->SpRegOffset = 0xc;
2550                         mos7840_port->ControlRegOffset = 0xd;
2551                         mos7840_port->DcrRegOffset = 0x1c;
2552                 }
2553                 mos7840_dump_serial_port(mos7840_port);
2554
2555                 mos7840_set_port_private(serial->port[i], mos7840_port);
2556
2557                 //enable rx_disable bit in control register
2558
2559                 status =
2560                     mos7840_get_reg_sync(serial->port[i],
2561                                          mos7840_port->ControlRegOffset, &Data);
2562                 if (status < 0) {
2563                         dbg("Reading ControlReg failed status-0x%x\n", status);
2564                         break;
2565                 } else
2566                         dbg("ControlReg Reading success val is %x, status%d\n",
2567                             Data, status);
2568                 Data |= 0x08;   //setting driver done bit
2569                 Data |= 0x04;   //sp1_bit to have cts change reflect in modem status reg
2570
2571                 //Data |= 0x20; //rx_disable bit
2572                 status = 0;
2573                 status =
2574                     mos7840_set_reg_sync(serial->port[i],
2575                                          mos7840_port->ControlRegOffset, Data);
2576                 if (status < 0) {
2577                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2578                         break;
2579                 } else
2580                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2581                             status);
2582
2583                 //Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 and 0x24 in DCR3
2584                 Data = 0x01;
2585                 status = 0;
2586                 status =
2587                     mos7840_set_reg_sync(serial->port[i],
2588                                          (__u16) (mos7840_port->DcrRegOffset +
2589                                                   0), Data);
2590                 if (status < 0) {
2591                         dbg("Writing DCR0 failed status-0x%x\n", status);
2592                         break;
2593                 } else
2594                         dbg("DCR0 Writing success status%d\n", status);
2595
2596                 Data = 0x05;
2597                 status = 0;
2598                 status =
2599                     mos7840_set_reg_sync(serial->port[i],
2600                                          (__u16) (mos7840_port->DcrRegOffset +
2601                                                   1), Data);
2602                 if (status < 0) {
2603                         dbg("Writing DCR1 failed status-0x%x\n", status);
2604                         break;
2605                 } else
2606                         dbg("DCR1 Writing success status%d\n", status);
2607
2608                 Data = 0x24;
2609                 status = 0;
2610                 status =
2611                     mos7840_set_reg_sync(serial->port[i],
2612                                          (__u16) (mos7840_port->DcrRegOffset +
2613                                                   2), Data);
2614                 if (status < 0) {
2615                         dbg("Writing DCR2 failed status-0x%x\n", status);
2616                         break;
2617                 } else
2618                         dbg("DCR2 Writing success status%d\n", status);
2619
2620                 // write values in clkstart0x0 and clkmulti 0x20
2621                 Data = 0x0;
2622                 status = 0;
2623                 status =
2624                     mos7840_set_reg_sync(serial->port[i],
2625                                          CLK_START_VALUE_REGISTER, Data);
2626                 if (status < 0) {
2627                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2628                         break;
2629                 } else
2630                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2631
2632                 Data = 0x20;
2633                 status =
2634                     mos7840_set_reg_sync(serial->port[i], CLK_MULTI_REGISTER,
2635                                          Data);
2636                 if (status < 0) {
2637                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2638                             status);
2639                         goto error;
2640                 } else
2641                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2642                             status);
2643
2644                 //write value 0x0 to scratchpad register
2645                 Data = 0x00;
2646                 status =
2647                     mos7840_set_uart_reg(serial->port[i], SCRATCH_PAD_REGISTER,
2648                                          Data);
2649                 if (status < 0) {
2650                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2651                             status);
2652                         break;
2653                 } else
2654                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2655                             status);
2656
2657                 //Zero Length flag register
2658                 if ((mos7840_port->port_num != 1)
2659                     && (serial->num_ports == 2)) {
2660
2661                         Data = 0xff;
2662                         status = 0;
2663                         status = mos7840_set_reg_sync(serial->port[i],
2664                                                       (__u16) (ZLP_REG1 +
2665                                                                ((__u16)
2666                                                                 mos7840_port->
2667                                                                 port_num)),
2668                                                       Data);
2669                         dbg("ZLIP offset%x\n",
2670                             (__u16) (ZLP_REG1 +
2671                                      ((__u16) mos7840_port->port_num)));
2672                         if (status < 0) {
2673                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2674                                     i + 2, status);
2675                                 break;
2676                         } else
2677                                 dbg("ZLP_REG%d Writing success status%d\n",
2678                                     i + 2, status);
2679                 } else {
2680                         Data = 0xff;
2681                         status = 0;
2682                         status = mos7840_set_reg_sync(serial->port[i],
2683                                                       (__u16) (ZLP_REG1 +
2684                                                                ((__u16)
2685                                                                 mos7840_port->
2686                                                                 port_num) -
2687                                                                0x1), Data);
2688                         dbg("ZLIP offset%x\n",
2689                             (__u16) (ZLP_REG1 +
2690                                      ((__u16) mos7840_port->port_num) - 0x1));
2691                         if (status < 0) {
2692                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2693                                     i + 1, status);
2694                                 break;
2695                         } else
2696                                 dbg("ZLP_REG%d Writing success status%d\n",
2697                                     i + 1, status);
2698
2699                 }
2700                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2701                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2702                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
2703                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf || !mos7840_port->dr) {
2704                         status = -ENOMEM;
2705                         goto error;
2706                 }
2707         }
2708
2709         //Zero Length flag enable
2710         Data = 0x0f;
2711         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2712         if (status < 0) {
2713                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2714                 goto error;
2715         } else
2716                 dbg("ZLP_REG5 Writing success status%d\n", status);
2717
2718         /* setting configuration feature to one */
2719         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2720                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2721         return 0;
2722 error:
2723         for (/* nothing */; i >= 0; i--) {
2724                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2725
2726                 kfree(mos7840_port->dr);
2727                 kfree(mos7840_port->ctrl_buf);
2728                 usb_free_urb(mos7840_port->control_urb);
2729                 kfree(mos7840_port);
2730                 serial->port[i] = NULL;
2731         }
2732         return status;
2733 }
2734
2735 /****************************************************************************
2736  * mos7840_shutdown
2737  *      This function is called whenever the device is removed from the usb bus.
2738  ****************************************************************************/
2739
2740 static void mos7840_shutdown(struct usb_serial *serial)
2741 {
2742         int i;
2743         unsigned long flags;
2744         struct moschip_port *mos7840_port;
2745         dbg("%s \n", " shutdown :entering..........");
2746
2747         if (!serial) {
2748                 dbg("%s", "Invalid Handler \n");
2749                 return;
2750         }
2751
2752         /*      check for the ports to be closed,close the ports and disconnect         */
2753
2754         /* free private structure allocated for serial port  *
2755          * stop reads and writes on all ports                */
2756
2757         for (i = 0; i < serial->num_ports; ++i) {
2758                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2759                 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2760                 mos7840_port->zombie = 1;
2761                 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2762                 usb_kill_urb(mos7840_port->control_urb);
2763                 kfree(mos7840_port->ctrl_buf);
2764                 kfree(mos7840_port->dr);
2765                 kfree(mos7840_port);
2766                 mos7840_set_port_private(serial->port[i], NULL);
2767         }
2768
2769         dbg("%s\n", "Thank u :: ");
2770
2771 }
2772
2773 static struct usb_driver io_driver = {
2774         .name = "mos7840",
2775         .probe = usb_serial_probe,
2776         .disconnect = usb_serial_disconnect,
2777         .id_table = moschip_id_table_combined,
2778         .no_dynamic_id = 1,
2779 };
2780
2781 static struct usb_serial_driver moschip7840_4port_device = {
2782         .driver = {
2783                    .owner = THIS_MODULE,
2784                    .name = "mos7840",
2785                    },
2786         .description = DRIVER_DESC,
2787         .usb_driver = &io_driver,
2788         .id_table = moschip_port_id_table,
2789         .num_interrupt_in = 1,  //NUM_DONT_CARE,//1,
2790 #ifdef check
2791         .num_bulk_in = 4,
2792         .num_bulk_out = 4,
2793         .num_ports = 4,
2794 #endif
2795         .open = mos7840_open,
2796         .close = mos7840_close,
2797         .write = mos7840_write,
2798         .write_room = mos7840_write_room,
2799         .chars_in_buffer = mos7840_chars_in_buffer,
2800         .throttle = mos7840_throttle,
2801         .unthrottle = mos7840_unthrottle,
2802         .calc_num_ports = mos7840_calc_num_ports,
2803 #ifdef MCSSerialProbe
2804         .probe = mos7840_serial_probe,
2805 #endif
2806         .ioctl = mos7840_ioctl,
2807         .set_termios = mos7840_set_termios,
2808         .break_ctl = mos7840_break,
2809         .tiocmget = mos7840_tiocmget,
2810         .tiocmset = mos7840_tiocmset,
2811         .attach = mos7840_startup,
2812         .shutdown = mos7840_shutdown,
2813         .read_bulk_callback = mos7840_bulk_in_callback,
2814         .read_int_callback = mos7840_interrupt_callback,
2815 };
2816
2817 /****************************************************************************
2818  * moschip7840_init
2819  *      This is called by the module subsystem, or on startup to initialize us
2820  ****************************************************************************/
2821 static int __init moschip7840_init(void)
2822 {
2823         int retval;
2824
2825         dbg("%s \n", " mos7840_init :entering..........");
2826
2827         /* Register with the usb serial */
2828         retval = usb_serial_register(&moschip7840_4port_device);
2829
2830         if (retval)
2831                 goto failed_port_device_register;
2832
2833         dbg("%s\n", "Entring...");
2834         info(DRIVER_DESC " " DRIVER_VERSION);
2835
2836         /* Register with the usb */
2837         retval = usb_register(&io_driver);
2838
2839         if (retval)
2840                 goto failed_usb_register;
2841
2842         if (retval == 0) {
2843                 dbg("%s\n", "Leaving...");
2844                 return 0;
2845         }
2846
2847       failed_usb_register:
2848         usb_serial_deregister(&moschip7840_4port_device);
2849
2850       failed_port_device_register:
2851
2852         return retval;
2853 }
2854
2855 /****************************************************************************
2856  * moschip7840_exit
2857  *      Called when the driver is about to be unloaded.
2858  ****************************************************************************/
2859 static void __exit moschip7840_exit(void)
2860 {
2861
2862         dbg("%s \n", " mos7840_exit :entering..........");
2863
2864         usb_deregister(&io_driver);
2865
2866         usb_serial_deregister(&moschip7840_4port_device);
2867
2868         dbg("%s\n", "Entring...");
2869 }
2870
2871 module_init(moschip7840_init);
2872 module_exit(moschip7840_exit);
2873
2874 /* Module information */
2875 MODULE_DESCRIPTION(DRIVER_DESC);
2876 MODULE_LICENSE("GPL");
2877
2878 module_param(debug, bool, S_IRUGO | S_IWUSR);
2879 MODULE_PARM_DESC(debug, "Debug enabled or not");