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

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/smp_lock.h>
  30 #include <linux/tty.h>
  31 #include <linux/tty_driver.h>
  32 #include <linux/tty_flip.h>
  33 #include <linux/module.h>
  34 #include <linux/serial.h>
  35 #include <linux/usb.h>
  36 #include <linux/usb/serial.h>
  37 #include <linux/uaccess.h>
  38
  39 /*
  40  * Version Information
  41  */
  42 #define DRIVER_VERSION "1.3.2"
  43 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  44
  45 /*
  46  * 16C50 UART register defines
  47  */
  48
  49 #define LCR_BITS_5             0x00     /* 5 bits/char */
  50 #define LCR_BITS_6             0x01     /* 6 bits/char */
  51 #define LCR_BITS_7             0x02     /* 7 bits/char */
  52 #define LCR_BITS_8             0x03     /* 8 bits/char */
  53 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  54
  55 #define LCR_STOP_1             0x00     /* 1 stop bit */
  56 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  57 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  58 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  59
  60 #define LCR_PAR_NONE           0x00     /* No parity */
  61 #define LCR_PAR_ODD            0x08     /* Odd parity */
  62 #define LCR_PAR_EVEN           0x18     /* Even parity */
  63 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  64 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  65 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  66
  67 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  68 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  69
  70 #define MCR_DTR                0x01     /* Assert DTR */
  71 #define MCR_RTS                0x02     /* Assert RTS */
  72 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  73 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  74 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  75 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  76
  77 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  78 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  79 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  80 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  81
  82 /*
  83  * Defines used for sending commands to port
  84  */
  85
  86 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  87 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  88
  89 #define MOS_PORT1       0x0200
  90 #define MOS_PORT2       0x0300
  91 #define MOS_VENREG      0x0000
  92 #define MOS_MAX_PORT    0x02
  93 #define MOS_WRITE       0x0E
  94 #define MOS_READ        0x0D
  95
  96 /* Requests */
  97 #define MCS_RD_RTYPE    0xC0
  98 #define MCS_WR_RTYPE    0x40
  99 #define MCS_RDREQ       0x0D
 100 #define MCS_WRREQ       0x0E
 101 #define MCS_CTRL_TIMEOUT        500
 102 #define VENDOR_READ_LENGTH      (0x01)
 103
 104 #define MAX_NAME_LEN    64
 105
 106 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 107 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 108
 109 /* For higher baud Rates use TIOCEXBAUD */
 110 #define TIOCEXBAUD     0x5462
 111
 112 /* vendor id and device id defines */
 113
 114 /* The native mos7840/7820 component */
 115 #define USB_VENDOR_ID_MOSCHIP           0x9710
 116 #define MOSCHIP_DEVICE_ID_7840          0x7840
 117 #define MOSCHIP_DEVICE_ID_7820          0x7820
 118 /* The native component can have its vendor/device id's overridden
 119  * in vendor-specific implementations.  Such devices can be handled
 120  * by making a change here, in moschip_port_id_table, and in
 121  * moschip_id_table_combined
 122  */
 123 #define USB_VENDOR_ID_BANDB             0x0856
 124 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 125 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 126
 127 /* This driver also supports the ATEN UC2324 device since it is mos7840 based
 128  *  - if I knew the device id it would also support the ATEN UC2322 */
 129 #define USB_VENDOR_ID_ATENINTL          0x0557
 130 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 131
 132 /* Interrupt Routine Defines    */
 133
 134 #define SERIAL_IIR_RLS      0x06
 135 #define SERIAL_IIR_MS       0x00
 136
 137 /*
 138  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 139  */
 140 #define SERIAL_LSR_DR       0x0001
 141 #define SERIAL_LSR_OE       0x0002
 142 #define SERIAL_LSR_PE       0x0004
 143 #define SERIAL_LSR_FE       0x0008
 144 #define SERIAL_LSR_BI       0x0010
 145
 146 #define MOS_MSR_DELTA_CTS   0x10
 147 #define MOS_MSR_DELTA_DSR   0x20
 148 #define MOS_MSR_DELTA_RI    0x40
 149 #define MOS_MSR_DELTA_CD    0x80
 150
 151 /* Serial Port register Address */
 152 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 153 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 154 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 155 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 156 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 157 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 158 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 159 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 160 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 161
 162 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 163 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 164
 165 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 166
 167 /*
 168  * URB POOL related defines
 169  */
 170 #define NUM_URBS                        16      /* URB Count */
 171 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 172
 173
 174 static struct usb_device_id moschip_port_id_table[] = {
 175         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 176         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 177         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 178         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 179         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 180         {}                      /* terminating entry */
 181 };
 182
 183 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 184         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 185         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 186         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 187         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 188         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 189         {}                      /* terminating entry */
 190 };
 191
 192 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 193
 194 /* This structure holds all of the local port information */
 195
 196 struct moschip_port {
 197         int port_num;           /*Actual port number in the device(1,2,etc) */
 198         struct urb *write_urb;  /* write URB for this port */
 199         struct urb *read_urb;   /* read URB for this port */
 200         struct urb *int_urb;
 201         __u8 shadowLCR;         /* last LCR value received */
 202         __u8 shadowMCR;         /* last MCR value received */
 203         char open;
 204         char open_ports;
 205         char zombie;
 206         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 207         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 208         int delta_msr_cond;
 209         struct async_icount icount;
 210         struct usb_serial_port *port;   /* loop back to the owner of this object */
 211
 212         /* Offsets */
 213         __u8 SpRegOffset;
 214         __u8 ControlRegOffset;
 215         __u8 DcrRegOffset;
 216         /* for processing control URBS in interrupt context */
 217         struct urb *control_urb;
 218         struct usb_ctrlrequest *dr;
 219         char *ctrl_buf;
 220         int MsrLsr;
 221
 222         spinlock_t pool_lock;
 223         struct urb *write_urb_pool[NUM_URBS];
 224         char busy[NUM_URBS];
 225         bool read_urb_busy;
 226 };
 227
 228
 229 static int debug;
 230
 231 /*
 232  * mos7840_set_reg_sync
 233  *      To set the Control register by calling usb_fill_control_urb function
 234  *      by passing usb_sndctrlpipe function as parameter.
 235  */
 236
 237 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 238                                 __u16 val)
 239 {
 240         struct usb_device *dev = port->serial->dev;
 241         val = val & 0x00ff;
 242         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 243
 244         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 245                                MCS_WR_RTYPE, val, reg, NULL, 0,
 246                                MOS_WDR_TIMEOUT);
 247 }
 248
 249 /*
 250  * mos7840_get_reg_sync
 251  *      To set the Uart register by calling usb_fill_control_urb function by
 252  *      passing usb_rcvctrlpipe function as parameter.
 253  */
 254
 255 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 256                                 __u16 *val)
 257 {
 258         struct usb_device *dev = port->serial->dev;
 259         int ret = 0;
 260
 261         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 262                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 263                               MOS_WDR_TIMEOUT);
 264         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 265         *val = (*val) & 0x00ff;
 266         return ret;
 267 }
 268
 269 /*
 270  * mos7840_set_uart_reg
 271  *      To set the Uart register by calling usb_fill_control_urb function by
 272  *      passing usb_sndctrlpipe function as parameter.
 273  */
 274
 275 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 276                                 __u16 val)
 277 {
 278
 279         struct usb_device *dev = port->serial->dev;
 280         val = val & 0x00ff;
 281         /* For the UART control registers, the application number need
 282            to be Or'ed */
 283         if (port->serial->num_ports == 4) {
 284                 val |= (((__u16) port->number -
 285                                 (__u16) (port->serial->minor)) + 1) << 8;
 286                 dbg("mos7840_set_uart_reg application number is %x", val);
 287         } else {
 288                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 289                         val |= (((__u16) port->number -
 290                               (__u16) (port->serial->minor)) + 1) << 8;
 291                         dbg("mos7840_set_uart_reg application number is %x",
 292                             val);
 293                 } else {
 294                         val |=
 295                             (((__u16) port->number -
 296                               (__u16) (port->serial->minor)) + 2) << 8;
 297                         dbg("mos7840_set_uart_reg application number is %x",
 298                             val);
 299                 }
 300         }
 301         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 302                                MCS_WR_RTYPE, val, reg, NULL, 0,
 303                                MOS_WDR_TIMEOUT);
 304
 305 }
 306
 307 /*
 308  * mos7840_get_uart_reg
 309  *      To set the Control register by calling usb_fill_control_urb function
 310  *      by passing usb_rcvctrlpipe function as parameter.
 311  */
 312 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 313                                 __u16 *val)
 314 {
 315         struct usb_device *dev = port->serial->dev;
 316         int ret = 0;
 317         __u16 Wval;
 318
 319         /* dbg("application number is %4x",
 320             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 321         /* Wval  is same as application number */
 322         if (port->serial->num_ports == 4) {
 323                 Wval =
 324                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 325                      1) << 8;
 326                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 327         } else {
 328                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 329                         Wval = (((__u16) port->number -
 330                               (__u16) (port->serial->minor)) + 1) << 8;
 331                         dbg("mos7840_get_uart_reg application number is %x",
 332                             Wval);
 333                 } else {
 334                         Wval = (((__u16) port->number -
 335                               (__u16) (port->serial->minor)) + 2) << 8;
 336                         dbg("mos7840_get_uart_reg application number is %x",
 337                             Wval);
 338                 }
 339         }
 340         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 341                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 342                               MOS_WDR_TIMEOUT);
 343         *val = (*val) & 0x00ff;
 344         return ret;
 345 }
 346
 347 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 348 {
 349
 350         dbg("***************************************");
 351         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 352         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 353         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 354         dbg("***************************************");
 355
 356 }
 357
 358 /************************************************************************/
 359 /************************************************************************/
 360 /*             I N T E R F A C E   F U N C T I O N S                    */
 361 /*             I N T E R F A C E   F U N C T I O N S                    */
 362 /************************************************************************/
 363 /************************************************************************/
 364
 365 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 366                                             struct moschip_port *data)
 367 {
 368         usb_set_serial_port_data(port, (void *)data);
 369 }
 370
 371 static inline struct moschip_port *mos7840_get_port_private(struct
 372                                                             usb_serial_port
 373                                                             *port)
 374 {
 375         return (struct moschip_port *)usb_get_serial_port_data(port);
 376 }
 377
 378 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 379 {
 380         struct moschip_port *mos7840_port;
 381         struct async_icount *icount;
 382         mos7840_port = port;
 383         icount = &mos7840_port->icount;
 384         if (new_msr &
 385             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 386              MOS_MSR_DELTA_CD)) {
 387                 icount = &mos7840_port->icount;
 388
 389                 /* update input line counters */
 390                 if (new_msr & MOS_MSR_DELTA_CTS) {
 391                         icount->cts++;
 392                         smp_wmb();
 393                 }
 394                 if (new_msr & MOS_MSR_DELTA_DSR) {
 395                         icount->dsr++;
 396                         smp_wmb();
 397                 }
 398                 if (new_msr & MOS_MSR_DELTA_CD) {
 399                         icount->dcd++;
 400                         smp_wmb();
 401                 }
 402                 if (new_msr & MOS_MSR_DELTA_RI) {
 403                         icount->rng++;
 404                         smp_wmb();
 405                 }
 406         }
 407 }
 408
 409 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 410 {
 411         struct async_icount *icount;
 412
 413         dbg("%s - %02x", __func__, new_lsr);
 414
 415         if (new_lsr & SERIAL_LSR_BI) {
 416                 /*
 417                  * Parity and Framing errors only count if they
 418                  * occur exclusive of a break being
 419                  * received.
 420                  */
 421                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 422         }
 423
 424         /* update input line counters */
 425         icount = &port->icount;
 426         if (new_lsr & SERIAL_LSR_BI) {
 427                 icount->brk++;
 428                 smp_wmb();
 429         }
 430         if (new_lsr & SERIAL_LSR_OE) {
 431                 icount->overrun++;
 432                 smp_wmb();
 433         }
 434         if (new_lsr & SERIAL_LSR_PE) {
 435                 icount->parity++;
 436                 smp_wmb();
 437         }
 438         if (new_lsr & SERIAL_LSR_FE) {
 439                 icount->frame++;
 440                 smp_wmb();
 441         }
 442 }
 443
 444 /************************************************************************/
 445 /************************************************************************/
 446 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 447 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 448 /************************************************************************/
 449 /************************************************************************/
 450
 451 static void mos7840_control_callback(struct urb *urb)
 452 {
 453         unsigned char *data;
 454         struct moschip_port *mos7840_port;
 455         __u8 regval = 0x0;
 456         int result = 0;
 457         int status = urb->status;
 458
 459         mos7840_port = urb->context;
 460
 461         switch (status) {
 462         case 0:
 463                 /* success */
 464                 break;
 465         case -ECONNRESET:
 466         case -ENOENT:
 467         case -ESHUTDOWN:
 468                 /* this urb is terminated, clean up */
 469                 dbg("%s - urb shutting down with status: %d", __func__,
 470                     status);
 471                 return;
 472         default:
 473                 dbg("%s - nonzero urb status received: %d", __func__,
 474                     status);
 475                 goto exit;
 476         }
 477
 478         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 479         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 480             mos7840_port->MsrLsr, mos7840_port->port_num);
 481         data = urb->transfer_buffer;
 482         regval = (__u8) data[0];
 483         dbg("%s data is %x", __func__, regval);
 484         if (mos7840_port->MsrLsr == 0)
 485                 mos7840_handle_new_msr(mos7840_port, regval);
 486         else if (mos7840_port->MsrLsr == 1)
 487                 mos7840_handle_new_lsr(mos7840_port, regval);
 488
 489 exit:
 490         spin_lock(&mos7840_port->pool_lock);
 491         if (!mos7840_port->zombie)
 492                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 493         spin_unlock(&mos7840_port->pool_lock);
 494         if (result) {
 495                 dev_err(&urb->dev->dev,
 496                         "%s - Error %d submitting interrupt urb\n",
 497                         __func__, result);
 498         }
 499 }
 500
 501 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 502                            __u16 *val)
 503 {
 504         struct usb_device *dev = mcs->port->serial->dev;
 505         struct usb_ctrlrequest *dr = mcs->dr;
 506         unsigned char *buffer = mcs->ctrl_buf;
 507         int ret;
 508
 509         dr->bRequestType = MCS_RD_RTYPE;
 510         dr->bRequest = MCS_RDREQ;
 511         dr->wValue = cpu_to_le16(Wval); /* 0 */
 512         dr->wIndex = cpu_to_le16(reg);
 513         dr->wLength = cpu_to_le16(2);
 514
 515         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 516                              (unsigned char *)dr, buffer, 2,
 517                              mos7840_control_callback, mcs);
 518         mcs->control_urb->transfer_buffer_length = 2;
 519         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 520         return ret;
 521 }
 522
 523 /*****************************************************************************
 524  * mos7840_interrupt_callback
 525  *      this is the callback function for when we have received data on the
 526  *      interrupt endpoint.
 527  *****************************************************************************/
 528
 529 static void mos7840_interrupt_callback(struct urb *urb)
 530 {
 531         int result;
 532         int length;
 533         struct moschip_port *mos7840_port;
 534         struct usb_serial *serial;
 535         __u16 Data;
 536         unsigned char *data;
 537         __u8 sp[5], st;
 538         int i, rv = 0;
 539         __u16 wval, wreg = 0;
 540         int status = urb->status;
 541
 542         dbg("%s", " : Entering");
 543
 544         switch (status) {
 545         case 0:
 546                 /* success */
 547                 break;
 548         case -ECONNRESET:
 549         case -ENOENT:
 550         case -ESHUTDOWN:
 551                 /* this urb is terminated, clean up */
 552                 dbg("%s - urb shutting down with status: %d", __func__,
 553                     status);
 554                 return;
 555         default:
 556                 dbg("%s - nonzero urb status received: %d", __func__,
 557                     status);
 558                 goto exit;
 559         }
 560
 561         length = urb->actual_length;
 562         data = urb->transfer_buffer;
 563
 564         serial = urb->context;
 565
 566         /* Moschip get 5 bytes
 567          * Byte 1 IIR Port 1 (port.number is 0)
 568          * Byte 2 IIR Port 2 (port.number is 1)
 569          * Byte 3 IIR Port 3 (port.number is 2)
 570          * Byte 4 IIR Port 4 (port.number is 3)
 571          * Byte 5 FIFO status for both */
 572
 573         if (length && length > 5) {
 574                 dbg("%s", "Wrong data !!!");
 575                 return;
 576         }
 577
 578         sp[0] = (__u8) data[0];
 579         sp[1] = (__u8) data[1];
 580         sp[2] = (__u8) data[2];
 581         sp[3] = (__u8) data[3];
 582         st = (__u8) data[4];
 583
 584         for (i = 0; i < serial->num_ports; i++) {
 585                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 586                 wval =
 587                     (((__u16) serial->port[i]->number -
 588                       (__u16) (serial->minor)) + 1) << 8;
 589                 if (mos7840_port->open) {
 590                         if (sp[i] & 0x01) {
 591                                 dbg("SP%d No Interrupt !!!", i);
 592                         } else {
 593                                 switch (sp[i] & 0x0f) {
 594                                 case SERIAL_IIR_RLS:
 595                                         dbg("Serial Port %d: Receiver status error or ", i);
 596                                         dbg("address bit detected in 9-bit mode");
 597                                         mos7840_port->MsrLsr = 1;
 598                                         wreg = LINE_STATUS_REGISTER;
 599                                         break;
 600                                 case SERIAL_IIR_MS:
 601                                         dbg("Serial Port %d: Modem status change", i);
 602                                         mos7840_port->MsrLsr = 0;
 603                                         wreg = MODEM_STATUS_REGISTER;
 604                                         break;
 605                                 }
 606                                 spin_lock(&mos7840_port->pool_lock);
 607                                 if (!mos7840_port->zombie) {
 608                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 609                                 } else {
 610                                         spin_unlock(&mos7840_port->pool_lock);
 611                                         return;
 612                                 }
 613                                 spin_unlock(&mos7840_port->pool_lock);
 614                         }
 615                 }
 616         }
 617         if (!(rv < 0))
 618                 /* the completion handler for the control urb will resubmit */
 619                 return;
 620 exit:
 621         result = usb_submit_urb(urb, GFP_ATOMIC);
 622         if (result) {
 623                 dev_err(&urb->dev->dev,
 624                         "%s - Error %d submitting interrupt urb\n",
 625                         __func__, result);
 626         }
 627 }
 628
 629 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 630                                        const char *function)
 631 {
 632         if (!port) {
 633                 dbg("%s - port == NULL", function);
 634                 return -1;
 635         }
 636         if (!port->serial) {
 637                 dbg("%s - port->serial == NULL", function);
 638                 return -1;
 639         }
 640
 641         return 0;
 642 }
 643
 644 /* Inline functions to check the sanity of a pointer that is passed to us */
 645 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 646                                          const char *function)
 647 {
 648         if (!serial) {
 649                 dbg("%s - serial == NULL", function);
 650                 return -1;
 651         }
 652         if (!serial->type) {
 653                 dbg("%s - serial->type == NULL!", function);
 654                 return -1;
 655         }
 656
 657         return 0;
 658 }
 659
 660 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 661                                                  const char *function)
 662 {
 663         /* if no port was specified, or it fails a paranoia check */
 664         if (!port ||
 665             mos7840_port_paranoia_check(port, function) ||
 666             mos7840_serial_paranoia_check(port->serial, function)) {
 667                 /* then say that we don't have a valid usb_serial thing,
 668                  * which will end up genrating -ENODEV return values */
 669                 return NULL;
 670         }
 671
 672         return port->serial;
 673 }
 674
 675 /*****************************************************************************
 676  * mos7840_bulk_in_callback
 677  *      this is the callback function for when we have received data on the
 678  *      bulk in endpoint.
 679  *****************************************************************************/
 680
 681 static void mos7840_bulk_in_callback(struct urb *urb)
 682 {
 683         int retval;
 684         unsigned char *data;
 685         struct usb_serial *serial;
 686         struct usb_serial_port *port;
 687         struct moschip_port *mos7840_port;
 688         struct tty_struct *tty;
 689         int status = urb->status;
 690
 691         mos7840_port = urb->context;
 692         if (!mos7840_port) {
 693                 dbg("%s", "NULL mos7840_port pointer");
 694                 mos7840_port->read_urb_busy = false;
 695                 return;
 696         }
 697
 698         if (status) {
 699                 dbg("nonzero read bulk status received: %d", status);
 700                 mos7840_port->read_urb_busy = false;
 701                 return;
 702         }
 703
 704         port = (struct usb_serial_port *)mos7840_port->port;
 705         if (mos7840_port_paranoia_check(port, __func__)) {
 706                 dbg("%s", "Port Paranoia failed");
 707                 mos7840_port->read_urb_busy = false;
 708                 return;
 709         }
 710
 711         serial = mos7840_get_usb_serial(port, __func__);
 712         if (!serial) {
 713                 dbg("%s", "Bad serial pointer");
 714                 mos7840_port->read_urb_busy = false;
 715                 return;
 716         }
 717
 718         dbg("%s", "Entering... ");
 719
 720         data = urb->transfer_buffer;
 721
 722         dbg("%s", "Entering ...........");
 723
 724         if (urb->actual_length) {
 725                 tty = tty_port_tty_get(&mos7840_port->port->port);
 726                 if (tty) {
 727                         tty_buffer_request_room(tty, urb->actual_length);
 728                         tty_insert_flip_string(tty, data, urb->actual_length);
 729                         dbg(" %s ", data);
 730                         tty_flip_buffer_push(tty);
 731                         tty_kref_put(tty);
 732                 }
 733                 mos7840_port->icount.rx += urb->actual_length;
 734                 smp_wmb();
 735                 dbg("mos7840_port->icount.rx is %d:",
 736                     mos7840_port->icount.rx);
 737         }
 738
 739         if (!mos7840_port->read_urb) {
 740                 dbg("%s", "URB KILLED !!!");
 741                 mos7840_port->read_urb_busy = false;
 742                 return;
 743         }
 744
 745
 746         mos7840_port->read_urb->dev = serial->dev;
 747
 748         mos7840_port->read_urb_busy = true;
 749         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 750
 751         if (retval) {
 752                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 753                 mos7840_port->read_urb_busy = false;
 754         }
 755 }
 756
 757 /*****************************************************************************
 758  * mos7840_bulk_out_data_callback
 759  *      this is the callback function for when we have finished sending
 760  *      serial data on the bulk out endpoint.
 761  *****************************************************************************/
 762
 763 static void mos7840_bulk_out_data_callback(struct urb *urb)
 764 {
 765         struct moschip_port *mos7840_port;
 766         struct tty_struct *tty;
 767         int status = urb->status;
 768         int i;
 769
 770         mos7840_port = urb->context;
 771         spin_lock(&mos7840_port->pool_lock);
 772         for (i = 0; i < NUM_URBS; i++) {
 773                 if (urb == mos7840_port->write_urb_pool[i]) {
 774                         mos7840_port->busy[i] = 0;
 775                         break;
 776                 }
 777         }
 778         spin_unlock(&mos7840_port->pool_lock);
 779
 780         if (status) {
 781                 dbg("nonzero write bulk status received:%d", status);
 782                 return;
 783         }
 784
 785         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 786                 dbg("%s", "Port Paranoia failed");
 787                 return;
 788         }
 789
 790         dbg("%s", "Entering .........");
 791
 792         tty = tty_port_tty_get(&mos7840_port->port->port);
 793         if (tty && mos7840_port->open)
 794                 tty_wakeup(tty);
 795         tty_kref_put(tty);
 796
 797 }
 798
 799 /************************************************************************/
 800 /*       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       */
 801 /************************************************************************/
 802 #ifdef MCSSerialProbe
 803 static int mos7840_serial_probe(struct usb_serial *serial,
 804                                 const struct usb_device_id *id)
 805 {
 806
 807         /*need to implement the mode_reg reading and updating\
 808            structures usb_serial_ device_type\
 809            (i.e num_ports, num_bulkin,bulkout etc) */
 810         /* Also we can update the changes  attach */
 811         return 1;
 812 }
 813 #endif
 814
 815 /*****************************************************************************
 816  * mos7840_open
 817  *      this function is called by the tty driver when a port is opened
 818  *      If successful, we return 0
 819  *      Otherwise we return a negative error number.
 820  *****************************************************************************/
 821
 822 static int mos7840_open(struct tty_struct *tty,
 823                         struct usb_serial_port *port, struct file *filp)
 824 {
 825         int response;
 826         int j;
 827         struct usb_serial *serial;
 828         struct urb *urb;
 829         __u16 Data;
 830         int status;
 831         struct moschip_port *mos7840_port;
 832         struct moschip_port *port0;
 833
 834         dbg ("%s enter", __func__);
 835
 836         if (mos7840_port_paranoia_check(port, __func__)) {
 837                 dbg("%s", "Port Paranoia failed");
 838                 return -ENODEV;
 839         }
 840
 841         serial = port->serial;
 842
 843         if (mos7840_serial_paranoia_check(serial, __func__)) {
 844                 dbg("%s", "Serial Paranoia failed");
 845                 return -ENODEV;
 846         }
 847
 848         mos7840_port = mos7840_get_port_private(port);
 849         port0 = mos7840_get_port_private(serial->port[0]);
 850
 851         if (mos7840_port == NULL || port0 == NULL)
 852                 return -ENODEV;
 853
 854         usb_clear_halt(serial->dev, port->write_urb->pipe);
 855         usb_clear_halt(serial->dev, port->read_urb->pipe);
 856         port0->open_ports++;
 857
 858         /* Initialising the write urb pool */
 859         for (j = 0; j < NUM_URBS; ++j) {
 860                 urb = usb_alloc_urb(0, GFP_KERNEL);
 861                 mos7840_port->write_urb_pool[j] = urb;
 862
 863                 if (urb == NULL) {
 864                         dev_err(&port->dev, "No more urbs???\n");
 865                         continue;
 866                 }
 867
 868                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 869                                                                 GFP_KERNEL);
 870                 if (!urb->transfer_buffer) {
 871                         usb_free_urb(urb);
 872                         mos7840_port->write_urb_pool[j] = NULL;
 873                         dev_err(&port->dev,
 874                                 "%s-out of memory for urb buffers.\n",
 875                                 __func__);
 876                         continue;
 877                 }
 878         }
 879
 880 /*****************************************************************************
 881  * Initialize MCS7840 -- Write Init values to corresponding Registers
 882  *
 883  * Register Index
 884  * 1 : IER
 885  * 2 : FCR
 886  * 3 : LCR
 887  * 4 : MCR
 888  *
 889  * 0x08 : SP1/2 Control Reg
 890  *****************************************************************************/
 891
 892         /* NEED to check the following Block */
 893
 894         Data = 0x0;
 895         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 896         if (status < 0) {
 897                 dbg("Reading Spreg failed");
 898                 return -1;
 899         }
 900         Data |= 0x80;
 901         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 902         if (status < 0) {
 903                 dbg("writing Spreg failed");
 904                 return -1;
 905         }
 906
 907         Data &= ~0x80;
 908         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 909         if (status < 0) {
 910                 dbg("writing Spreg failed");
 911                 return -1;
 912         }
 913         /* End of block to be checked */
 914
 915         Data = 0x0;
 916         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 917                                                                         &Data);
 918         if (status < 0) {
 919                 dbg("Reading Controlreg failed");
 920                 return -1;
 921         }
 922         Data |= 0x08;           /* Driver done bit */
 923         Data |= 0x20;           /* rx_disable */
 924         status = mos7840_set_reg_sync(port,
 925                                 mos7840_port->ControlRegOffset, Data);
 926         if (status < 0) {
 927                 dbg("writing Controlreg failed");
 928                 return -1;
 929         }
 930         /* do register settings here */
 931         /* Set all regs to the device default values. */
 932         /***********************************
 933          * First Disable all interrupts.
 934          ***********************************/
 935         Data = 0x00;
 936         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 937         if (status < 0) {
 938                 dbg("disabling interrupts failed");
 939                 return -1;
 940         }
 941         /* Set FIFO_CONTROL_REGISTER to the default value */
 942         Data = 0x00;
 943         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 944         if (status < 0) {
 945                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 946                 return -1;
 947         }
 948
 949         Data = 0xcf;
 950         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 951         if (status < 0) {
 952                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 953                 return -1;
 954         }
 955
 956         Data = 0x03;
 957         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 958         mos7840_port->shadowLCR = Data;
 959
 960         Data = 0x0b;
 961         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 962         mos7840_port->shadowMCR = Data;
 963
 964         Data = 0x00;
 965         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 966         mos7840_port->shadowLCR = Data;
 967
 968         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 969         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 970
 971         Data = 0x0c;
 972         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 973
 974         Data = 0x0;
 975         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 976
 977         Data = 0x00;
 978         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 979
 980         Data = Data & ~SERIAL_LCR_DLAB;
 981         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 982         mos7840_port->shadowLCR = Data;
 983
 984         /* clearing Bulkin and Bulkout Fifo */
 985         Data = 0x0;
 986         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 987
 988         Data = Data | 0x0c;
 989         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 990
 991         Data = Data & ~0x0c;
 992         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 993         /* Finally enable all interrupts */
 994         Data = 0x0c;
 995         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 996
 997         /* clearing rx_disable */
 998         Data = 0x0;
 999         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1000                                                                         &Data);
1001         Data = Data & ~0x20;
1002         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1003                                                                         Data);
1004
1005         /* rx_negate */
1006         Data = 0x0;
1007         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1008                                                                         &Data);
1009         Data = Data | 0x10;
1010         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1011                                                                         Data);
1012
1013         /* Check to see if we've set up our endpoint info yet    *
1014          * (can't set it up in mos7840_startup as the structures *
1015          * were not set up at that time.)                        */
1016         if (port0->open_ports == 1) {
1017                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1018                         /* set up interrupt urb */
1019                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1020                                 serial->dev,
1021                                 usb_rcvintpipe(serial->dev,
1022                                 serial->port[0]->interrupt_in_endpointAddress),
1023                                 serial->port[0]->interrupt_in_buffer,
1024                                 serial->port[0]->interrupt_in_urb->
1025                                 transfer_buffer_length,
1026                                 mos7840_interrupt_callback,
1027                                 serial,
1028                                 serial->port[0]->interrupt_in_urb->interval);
1029
1030                         /* start interrupt read for mos7840               *
1031                          * will continue as long as mos7840 is connected  */
1032
1033                         response =
1034                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1035                                            GFP_KERNEL);
1036                         if (response) {
1037                                 dev_err(&port->dev, "%s - Error %d submitting "
1038                                         "interrupt urb\n", __func__, response);
1039                         }
1040
1041                 }
1042
1043         }
1044
1045         /* see if we've set up our endpoint info yet   *
1046          * (can't set it up in mos7840_startup as the  *
1047          * structures were not set up at that time.)   */
1048
1049         dbg("port number is %d", port->number);
1050         dbg("serial number is %d", port->serial->minor);
1051         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1052         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1053         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1054         dbg("port's number in the device is %d", mos7840_port->port_num);
1055         mos7840_port->read_urb = port->read_urb;
1056
1057         /* set up our bulk in urb */
1058
1059         usb_fill_bulk_urb(mos7840_port->read_urb,
1060                           serial->dev,
1061                           usb_rcvbulkpipe(serial->dev,
1062                                           port->bulk_in_endpointAddress),
1063                           port->bulk_in_buffer,
1064                           mos7840_port->read_urb->transfer_buffer_length,
1065                           mos7840_bulk_in_callback, mos7840_port);
1066
1067         dbg("mos7840_open: bulkin endpoint is %d",
1068             port->bulk_in_endpointAddress);
1069         mos7840_port->read_urb_busy = true;
1070         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1071         if (response) {
1072                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1073                         __func__, response);
1074                 mos7840_port->read_urb_busy = false;
1075         }
1076
1077         /* initialize our wait queues */
1078         init_waitqueue_head(&mos7840_port->wait_chase);
1079         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1080
1081         /* initialize our icount structure */
1082         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1083
1084         /* initialize our port settings */
1085         /* Must set to enable ints! */
1086         mos7840_port->shadowMCR = MCR_MASTER_IE;
1087         /* send a open port command */
1088         mos7840_port->open = 1;
1089         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1090         mos7840_port->icount.tx = 0;
1091         mos7840_port->icount.rx = 0;
1092
1093         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1094                                 serial, mos7840_port, port);
1095
1096         dbg ("%s leave", __func__);
1097
1098         return 0;
1099
1100 }
1101
1102 /*****************************************************************************
1103  * mos7840_chars_in_buffer
1104  *      this function is called by the tty driver when it wants to know how many
1105  *      bytes of data we currently have outstanding in the port (data that has
1106  *      been written, but hasn't made it out the port yet)
1107  *      If successful, we return the number of bytes left to be written in the
1108  *      system,
1109  *      Otherwise we return zero.
1110  *****************************************************************************/
1111
1112 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1113 {
1114         struct usb_serial_port *port = tty->driver_data;
1115         int i;
1116         int chars = 0;
1117         unsigned long flags;
1118         struct moschip_port *mos7840_port;
1119
1120         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1121
1122         if (mos7840_port_paranoia_check(port, __func__)) {
1123                 dbg("%s", "Invalid port");
1124                 return 0;
1125         }
1126
1127         mos7840_port = mos7840_get_port_private(port);
1128         if (mos7840_port == NULL) {
1129                 dbg("%s", "mos7840_break:leaving ...........");
1130                 return 0;
1131         }
1132
1133         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1134         for (i = 0; i < NUM_URBS; ++i)
1135                 if (mos7840_port->busy[i])
1136                         chars += URB_TRANSFER_BUFFER_SIZE;
1137         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1138         dbg("%s - returns %d", __func__, chars);
1139         return chars;
1140
1141 }
1142
1143 /*****************************************************************************
1144  * mos7840_close
1145  *      this function is called by the tty driver when a port is closed
1146  *****************************************************************************/
1147
1148 static void mos7840_close(struct usb_serial_port *port)
1149 {
1150         struct usb_serial *serial;
1151         struct moschip_port *mos7840_port;
1152         struct moschip_port *port0;
1153         int j;
1154         __u16 Data;
1155
1156         dbg("%s", "mos7840_close:entering...");
1157
1158         if (mos7840_port_paranoia_check(port, __func__)) {
1159                 dbg("%s", "Port Paranoia failed");
1160                 return;
1161         }
1162
1163         serial = mos7840_get_usb_serial(port, __func__);
1164         if (!serial) {
1165                 dbg("%s", "Serial Paranoia failed");
1166                 return;
1167         }
1168
1169         mos7840_port = mos7840_get_port_private(port);
1170         port0 = mos7840_get_port_private(serial->port[0]);
1171
1172         if (mos7840_port == NULL || port0 == NULL)
1173                 return;
1174
1175         for (j = 0; j < NUM_URBS; ++j)
1176                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1177
1178         /* Freeing Write URBs */
1179         for (j = 0; j < NUM_URBS; ++j) {
1180                 if (mos7840_port->write_urb_pool[j]) {
1181                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1182                                 kfree(mos7840_port->write_urb_pool[j]->
1183                                       transfer_buffer);
1184
1185                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1186                 }
1187         }
1188
1189         /* While closing port, shutdown all bulk read, write  *
1190          * and interrupt read if they exists                  */
1191         if (serial->dev) {
1192                 if (mos7840_port->write_urb) {
1193                         dbg("%s", "Shutdown bulk write");
1194                         usb_kill_urb(mos7840_port->write_urb);
1195                 }
1196                 if (mos7840_port->read_urb) {
1197                         dbg("%s", "Shutdown bulk read");
1198                         usb_kill_urb(mos7840_port->read_urb);
1199                         mos7840_port->read_urb_busy = false;
1200                 }
1201                 if ((&mos7840_port->control_urb)) {
1202                         dbg("%s", "Shutdown control read");
1203                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1204                 }
1205         }
1206 /*      if(mos7840_port->ctrl_buf != NULL) */
1207 /*              kfree(mos7840_port->ctrl_buf); */
1208         port0->open_ports--;
1209         dbg("mos7840_num_open_ports in close%d:in port%d",
1210             port0->open_ports, port->number);
1211         if (port0->open_ports == 0) {
1212                 if (serial->port[0]->interrupt_in_urb) {
1213                         dbg("%s", "Shutdown interrupt_in_urb");
1214                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1215                 }
1216         }
1217
1218         if (mos7840_port->write_urb) {
1219                 /* if this urb had a transfer buffer already (old tx) free it */
1220                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1221                         kfree(mos7840_port->write_urb->transfer_buffer);
1222                 usb_free_urb(mos7840_port->write_urb);
1223         }
1224
1225         Data = 0x0;
1226         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1227
1228         Data = 0x00;
1229         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1230
1231         mos7840_port->open = 0;
1232
1233         dbg("%s", "Leaving ............");
1234 }
1235
1236 /************************************************************************
1237  *
1238  * mos7840_block_until_chase_response
1239  *
1240  *      This function will block the close until one of the following:
1241  *              1. Response to our Chase comes from mos7840
1242  *              2. A timeout of 10 seconds without activity has expired
1243  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1244  *
1245  ************************************************************************/
1246
1247 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1248                                         struct moschip_port *mos7840_port)
1249 {
1250         int timeout = 1 * HZ;
1251         int wait = 10;
1252         int count;
1253
1254         while (1) {
1255                 count = mos7840_chars_in_buffer(tty);
1256
1257                 /* Check for Buffer status */
1258                 if (count <= 0)
1259                         return;
1260
1261                 /* Block the thread for a while */
1262                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1263                                                timeout);
1264                 /* No activity.. count down section */
1265                 wait--;
1266                 if (wait == 0) {
1267                         dbg("%s - TIMEOUT", __func__);
1268                         return;
1269                 } else {
1270                         /* Reset timeout value back to seconds */
1271                         wait = 10;
1272                 }
1273         }
1274
1275 }
1276
1277 /*****************************************************************************
1278  * mos7840_break
1279  *      this function sends a break to the port
1280  *****************************************************************************/
1281 static void mos7840_break(struct tty_struct *tty, int break_state)
1282 {
1283         struct usb_serial_port *port = tty->driver_data;
1284         unsigned char data;
1285         struct usb_serial *serial;
1286         struct moschip_port *mos7840_port;
1287
1288         dbg("%s", "Entering ...........");
1289         dbg("mos7840_break: Start");
1290
1291         if (mos7840_port_paranoia_check(port, __func__)) {
1292                 dbg("%s", "Port Paranoia failed");
1293                 return;
1294         }
1295
1296         serial = mos7840_get_usb_serial(port, __func__);
1297         if (!serial) {
1298                 dbg("%s", "Serial Paranoia failed");
1299                 return;
1300         }
1301
1302         mos7840_port = mos7840_get_port_private(port);
1303
1304         if (mos7840_port == NULL)
1305                 return;
1306
1307         if (serial->dev)
1308                 /* flush and block until tx is empty */
1309                 mos7840_block_until_chase_response(tty, mos7840_port);
1310
1311         if (break_state == -1)
1312                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1313         else
1314                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1315
1316         /* FIXME: no locking on shadowLCR anywhere in driver */
1317         mos7840_port->shadowLCR = data;
1318         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1319             mos7840_port->shadowLCR);
1320         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1321                              mos7840_port->shadowLCR);
1322
1323         return;
1324 }
1325
1326 /*****************************************************************************
1327  * mos7840_write_room
1328  *      this function is called by the tty driver when it wants to know how many
1329  *      bytes of data we can accept for a specific port.
1330  *      If successful, we return the amount of room that we have for this port
1331  *      Otherwise we return a negative error number.
1332  *****************************************************************************/
1333
1334 static int mos7840_write_room(struct tty_struct *tty)
1335 {
1336         struct usb_serial_port *port = tty->driver_data;
1337         int i;
1338         int room = 0;
1339         unsigned long flags;
1340         struct moschip_port *mos7840_port;
1341
1342         dbg("%s", " mos7840_write_room:entering ...........");
1343
1344         if (mos7840_port_paranoia_check(port, __func__)) {
1345                 dbg("%s", "Invalid port");
1346                 dbg("%s", " mos7840_write_room:leaving ...........");
1347                 return -1;
1348         }
1349
1350         mos7840_port = mos7840_get_port_private(port);
1351         if (mos7840_port == NULL) {
1352                 dbg("%s", "mos7840_break:leaving ...........");
1353                 return -1;
1354         }
1355
1356         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1357         for (i = 0; i < NUM_URBS; ++i) {
1358                 if (!mos7840_port->busy[i])
1359                         room += URB_TRANSFER_BUFFER_SIZE;
1360         }
1361         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1362
1363         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1364         dbg("%s - returns %d", __func__, room);
1365         return room;
1366
1367 }
1368
1369 /*****************************************************************************
1370  * mos7840_write
1371  *      this function is called by the tty driver when data should be written to
1372  *      the port.
1373  *      If successful, we return the number of bytes written, otherwise we
1374  *      return a negative error number.
1375  *****************************************************************************/
1376
1377 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1378                          const unsigned char *data, int count)
1379 {
1380         int status;
1381         int i;
1382         int bytes_sent = 0;
1383         int transfer_size;
1384         unsigned long flags;
1385
1386         struct moschip_port *mos7840_port;
1387         struct usb_serial *serial;
1388         struct urb *urb;
1389         /* __u16 Data; */
1390         const unsigned char *current_position = data;
1391         unsigned char *data1;
1392         dbg("%s", "entering ...........");
1393         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1394                                         mos7840_port->shadowLCR); */
1395
1396 #ifdef NOTMOS7840
1397         Data = 0x00;
1398         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1399         mos7840_port->shadowLCR = Data;
1400         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1401         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1402             mos7840_port->shadowLCR);
1403
1404         /* Data = 0x03; */
1405         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1406         /* mos7840_port->shadowLCR=Data;//Need to add later */
1407
1408         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1409         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1410
1411         /* Data = 0x0c; */
1412         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1413         Data = 0x00;
1414         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1415         dbg("mos7840_write:DLL value is %x", Data);
1416
1417         Data = 0x0;
1418         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1419         dbg("mos7840_write:DLM value is %x", Data);
1420
1421         Data = Data & ~SERIAL_LCR_DLAB;
1422         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1423             mos7840_port->shadowLCR);
1424         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1425 #endif
1426
1427         if (mos7840_port_paranoia_check(port, __func__)) {
1428                 dbg("%s", "Port Paranoia failed");
1429                 return -1;
1430         }
1431
1432         serial = port->serial;
1433         if (mos7840_serial_paranoia_check(serial, __func__)) {
1434                 dbg("%s", "Serial Paranoia failed");
1435                 return -1;
1436         }
1437
1438         mos7840_port = mos7840_get_port_private(port);
1439         if (mos7840_port == NULL) {
1440                 dbg("%s", "mos7840_port is NULL");
1441                 return -1;
1442         }
1443
1444         /* try to find a free urb in the list */
1445         urb = NULL;
1446
1447         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1448         for (i = 0; i < NUM_URBS; ++i) {
1449                 if (!mos7840_port->busy[i]) {
1450                         mos7840_port->busy[i] = 1;
1451                         urb = mos7840_port->write_urb_pool[i];
1452                         dbg("URB:%d", i);
1453                         break;
1454                 }
1455         }
1456         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1457
1458         if (urb == NULL) {
1459                 dbg("%s - no more free urbs", __func__);
1460                 goto exit;
1461         }
1462
1463         if (urb->transfer_buffer == NULL) {
1464                 urb->transfer_buffer =
1465                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1466
1467                 if (urb->transfer_buffer == NULL) {
1468                         dev_err(&port->dev, "%s no more kernel memory...\n",
1469                                 __func__);
1470                         goto exit;
1471                 }
1472         }
1473         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1474
1475         memcpy(urb->transfer_buffer, current_position, transfer_size);
1476
1477         /* fill urb with data and submit  */
1478         usb_fill_bulk_urb(urb,
1479                           serial->dev,
1480                           usb_sndbulkpipe(serial->dev,
1481                                           port->bulk_out_endpointAddress),
1482                           urb->transfer_buffer,
1483                           transfer_size,
1484                           mos7840_bulk_out_data_callback, mos7840_port);
1485
1486         data1 = urb->transfer_buffer;
1487         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1488
1489         /* send it down the pipe */
1490         status = usb_submit_urb(urb, GFP_ATOMIC);
1491
1492         if (status) {
1493                 mos7840_port->busy[i] = 0;
1494                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1495                         "with status = %d\n", __func__, status);
1496                 bytes_sent = status;
1497                 goto exit;
1498         }
1499         bytes_sent = transfer_size;
1500         mos7840_port->icount.tx += transfer_size;
1501         smp_wmb();
1502         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1503 exit:
1504         return bytes_sent;
1505
1506 }
1507
1508 /*****************************************************************************
1509  * mos7840_throttle
1510  *      this function is called by the tty driver when it wants to stop the data
1511  *      being read from the port.
1512  *****************************************************************************/
1513
1514 static void mos7840_throttle(struct tty_struct *tty)
1515 {
1516         struct usb_serial_port *port = tty->driver_data;
1517         struct moschip_port *mos7840_port;
1518         int status;
1519
1520         if (mos7840_port_paranoia_check(port, __func__)) {
1521                 dbg("%s", "Invalid port");
1522                 return;
1523         }
1524
1525         dbg("- port %d", port->number);
1526
1527         mos7840_port = mos7840_get_port_private(port);
1528
1529         if (mos7840_port == NULL)
1530                 return;
1531
1532         if (!mos7840_port->open) {
1533                 dbg("%s", "port not opened");
1534                 return;
1535         }
1536
1537         dbg("%s", "Entering ..........");
1538
1539         /* if we are implementing XON/XOFF, send the stop character */
1540         if (I_IXOFF(tty)) {
1541                 unsigned char stop_char = STOP_CHAR(tty);
1542                 status = mos7840_write(tty, port, &stop_char, 1);
1543                 if (status <= 0)
1544                         return;
1545         }
1546         /* if we are implementing RTS/CTS, toggle that line */
1547         if (tty->termios->c_cflag & CRTSCTS) {
1548                 mos7840_port->shadowMCR &= ~MCR_RTS;
1549                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1550                                          mos7840_port->shadowMCR);
1551                 if (status < 0)
1552                         return;
1553         }
1554
1555         return;
1556 }
1557
1558 /*****************************************************************************
1559  * mos7840_unthrottle
1560  *      this function is called by the tty driver when it wants to resume
1561  *      the data being read from the port (called after mos7840_throttle is
1562  *      called)
1563  *****************************************************************************/
1564 static void mos7840_unthrottle(struct tty_struct *tty)
1565 {
1566         struct usb_serial_port *port = tty->driver_data;
1567         int status;
1568         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1569
1570         if (mos7840_port_paranoia_check(port, __func__)) {
1571                 dbg("%s", "Invalid port");
1572                 return;
1573         }
1574
1575         if (mos7840_port == NULL)
1576                 return;
1577
1578         if (!mos7840_port->open) {
1579                 dbg("%s - port not opened", __func__);
1580                 return;
1581         }
1582
1583         dbg("%s", "Entering ..........");
1584
1585         /* if we are implementing XON/XOFF, send the start character */
1586         if (I_IXOFF(tty)) {
1587                 unsigned char start_char = START_CHAR(tty);
1588                 status = mos7840_write(tty, port, &start_char, 1);
1589                 if (status <= 0)
1590                         return;
1591         }
1592
1593         /* if we are implementing RTS/CTS, toggle that line */
1594         if (tty->termios->c_cflag & CRTSCTS) {
1595                 mos7840_port->shadowMCR |= MCR_RTS;
1596                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1597                                          mos7840_port->shadowMCR);
1598                 if (status < 0)
1599                         return;
1600         }
1601 }
1602
1603 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1604 {
1605         struct usb_serial_port *port = tty->driver_data;
1606         struct moschip_port *mos7840_port;
1607         unsigned int result;
1608         __u16 msr;
1609         __u16 mcr;
1610         int status;
1611         mos7840_port = mos7840_get_port_private(port);
1612
1613         dbg("%s - port %d", __func__, port->number);
1614
1615         if (mos7840_port == NULL)
1616                 return -ENODEV;
1617
1618         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1619         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1620         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1621             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1622             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1623             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1624             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1625             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1626             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1627
1628         dbg("%s - 0x%04X", __func__, result);
1629
1630         return result;
1631 }
1632
1633 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1634                             unsigned int set, unsigned int clear)
1635 {
1636         struct usb_serial_port *port = tty->driver_data;
1637         struct moschip_port *mos7840_port;
1638         unsigned int mcr;
1639         int status;
1640
1641         dbg("%s - port %d", __func__, port->number);
1642
1643         mos7840_port = mos7840_get_port_private(port);
1644
1645         if (mos7840_port == NULL)
1646                 return -ENODEV;
1647
1648         /* FIXME: What locks the port registers ? */
1649         mcr = mos7840_port->shadowMCR;
1650         if (clear & TIOCM_RTS)
1651                 mcr &= ~MCR_RTS;
1652         if (clear & TIOCM_DTR)
1653                 mcr &= ~MCR_DTR;
1654         if (clear & TIOCM_LOOP)
1655                 mcr &= ~MCR_LOOPBACK;
1656
1657         if (set & TIOCM_RTS)
1658                 mcr |= MCR_RTS;
1659         if (set & TIOCM_DTR)
1660                 mcr |= MCR_DTR;
1661         if (set & TIOCM_LOOP)
1662                 mcr |= MCR_LOOPBACK;
1663
1664         mos7840_port->shadowMCR = mcr;
1665
1666         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1667         if (status < 0) {
1668                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1669                 return status;
1670         }
1671
1672         return 0;
1673 }
1674
1675 /*****************************************************************************
1676  * mos7840_calc_baud_rate_divisor
1677  *      this function calculates the proper baud rate divisor for the specified
1678  *      baud rate.
1679  *****************************************************************************/
1680 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1681                                           __u16 *clk_sel_val)
1682 {
1683
1684         dbg("%s - %d", __func__, baudRate);
1685
1686         if (baudRate <= 115200) {
1687                 *divisor = 115200 / baudRate;
1688                 *clk_sel_val = 0x0;
1689         }
1690         if ((baudRate > 115200) && (baudRate <= 230400)) {
1691                 *divisor = 230400 / baudRate;
1692                 *clk_sel_val = 0x10;
1693         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1694                 *divisor = 403200 / baudRate;
1695                 *clk_sel_val = 0x20;
1696         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1697                 *divisor = 460800 / baudRate;
1698                 *clk_sel_val = 0x30;
1699         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1700                 *divisor = 806400 / baudRate;
1701                 *clk_sel_val = 0x40;
1702         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1703                 *divisor = 921600 / baudRate;
1704                 *clk_sel_val = 0x50;
1705         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1706                 *divisor = 1572864 / baudRate;
1707                 *clk_sel_val = 0x60;
1708         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1709                 *divisor = 3145728 / baudRate;
1710                 *clk_sel_val = 0x70;
1711         }
1712         return 0;
1713
1714 #ifdef NOTMCS7840
1715
1716         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1717                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1718                         *divisor = mos7840_divisor_table[i].Divisor;
1719                         return 0;
1720                 }
1721         }
1722
1723         /* After trying for all the standard baud rates    *
1724          * Try calculating the divisor for this baud rate  */
1725
1726         if (baudrate > 75 && baudrate < 230400) {
1727                 /* get the divisor */
1728                 custom = (__u16) (230400L / baudrate);
1729
1730                 /* Check for round off */
1731                 round1 = (__u16) (2304000L / baudrate);
1732                 round = (__u16) (round1 - (custom * 10));
1733                 if (round > 4)
1734                         custom++;
1735                 *divisor = custom;
1736
1737                 dbg(" Baud %d = %d", baudrate, custom);
1738                 return 0;
1739         }
1740
1741         dbg("%s", " Baud calculation Failed...");
1742         return -1;
1743 #endif
1744 }
1745
1746 /*****************************************************************************
1747  * mos7840_send_cmd_write_baud_rate
1748  *      this function sends the proper command to change the baud rate of the
1749  *      specified port.
1750  *****************************************************************************/
1751
1752 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1753                                             int baudRate)
1754 {
1755         int divisor = 0;
1756         int status;
1757         __u16 Data;
1758         unsigned char number;
1759         __u16 clk_sel_val;
1760         struct usb_serial_port *port;
1761
1762         if (mos7840_port == NULL)
1763                 return -1;
1764
1765         port = (struct usb_serial_port *)mos7840_port->port;
1766         if (mos7840_port_paranoia_check(port, __func__)) {
1767                 dbg("%s", "Invalid port");
1768                 return -1;
1769         }
1770
1771         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1772                 dbg("%s", "Invalid Serial");
1773                 return -1;
1774         }
1775
1776         dbg("%s", "Entering ..........");
1777
1778         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1779
1780         dbg("%s - port = %d, baud = %d", __func__,
1781             mos7840_port->port->number, baudRate);
1782         /* reset clk_uart_sel in spregOffset */
1783         if (baudRate > 115200) {
1784 #ifdef HW_flow_control
1785                 /* NOTE: need to see the pther register to modify */
1786                 /* setting h/w flow control bit to 1 */
1787                 Data = 0x2b;
1788                 mos7840_port->shadowMCR = Data;
1789                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1790                                                                         Data);
1791                 if (status < 0) {
1792                         dbg("Writing spreg failed in set_serial_baud");
1793                         return -1;
1794                 }
1795 #endif
1796
1797         } else {
1798 #ifdef HW_flow_control
1799                 / *setting h/w flow control bit to 0 */
1800                 Data = 0xb;
1801                 mos7840_port->shadowMCR = Data;
1802                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1803                                                                         Data);
1804                 if (status < 0) {
1805                         dbg("Writing spreg failed in set_serial_baud");
1806                         return -1;
1807                 }
1808 #endif
1809
1810         }
1811
1812         if (1) {                /* baudRate <= 115200) */
1813                 clk_sel_val = 0x0;
1814                 Data = 0x0;
1815                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1816                                                    &clk_sel_val);
1817                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1818                                                                  &Data);
1819                 if (status < 0) {
1820                         dbg("reading spreg failed in set_serial_baud");
1821                         return -1;
1822                 }
1823                 Data = (Data & 0x8f) | clk_sel_val;
1824                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1825                                                                 Data);
1826                 if (status < 0) {
1827                         dbg("Writing spreg failed in set_serial_baud");
1828                         return -1;
1829                 }
1830                 /* Calculate the Divisor */
1831
1832                 if (status) {
1833                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1834                         return status;
1835                 }
1836                 /* Enable access to divisor latch */
1837                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1838                 mos7840_port->shadowLCR = Data;
1839                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1840
1841                 /* Write the divisor */
1842                 Data = (unsigned char)(divisor & 0xff);
1843                 dbg("set_serial_baud Value to write DLL is %x", Data);
1844                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1845
1846                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1847                 dbg("set_serial_baud Value to write DLM is %x", Data);
1848                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1849
1850                 /* Disable access to divisor latch */
1851                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1852                 mos7840_port->shadowLCR = Data;
1853                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1854
1855         }
1856         return status;
1857 }
1858
1859 /*****************************************************************************
1860  * mos7840_change_port_settings
1861  *      This routine is called to set the UART on the device to match
1862  *      the specified new settings.
1863  *****************************************************************************/
1864
1865 static void mos7840_change_port_settings(struct tty_struct *tty,
1866         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1867 {
1868         int baud;
1869         unsigned cflag;
1870         unsigned iflag;
1871         __u8 lData;
1872         __u8 lParity;
1873         __u8 lStop;
1874         int status;
1875         __u16 Data;
1876         struct usb_serial_port *port;
1877         struct usb_serial *serial;
1878
1879         if (mos7840_port == NULL)
1880                 return;
1881
1882         port = (struct usb_serial_port *)mos7840_port->port;
1883
1884         if (mos7840_port_paranoia_check(port, __func__)) {
1885                 dbg("%s", "Invalid port");
1886                 return;
1887         }
1888
1889         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1890                 dbg("%s", "Invalid Serial");
1891                 return;
1892         }
1893
1894         serial = port->serial;
1895
1896         dbg("%s - port %d", __func__, mos7840_port->port->number);
1897
1898         if (!mos7840_port->open) {
1899                 dbg("%s - port not opened", __func__);
1900                 return;
1901         }
1902
1903         dbg("%s", "Entering ..........");
1904
1905         lData = LCR_BITS_8;
1906         lStop = LCR_STOP_1;
1907         lParity = LCR_PAR_NONE;
1908
1909         cflag = tty->termios->c_cflag;
1910         iflag = tty->termios->c_iflag;
1911
1912         /* Change the number of bits */
1913         if (cflag & CSIZE) {
1914                 switch (cflag & CSIZE) {
1915                 case CS5:
1916                         lData = LCR_BITS_5;
1917                         break;
1918
1919                 case CS6:
1920                         lData = LCR_BITS_6;
1921                         break;
1922
1923                 case CS7:
1924                         lData = LCR_BITS_7;
1925                         break;
1926                 default:
1927                 case CS8:
1928                         lData = LCR_BITS_8;
1929                         break;
1930                 }
1931         }
1932         /* Change the Parity bit */
1933         if (cflag & PARENB) {
1934                 if (cflag & PARODD) {
1935                         lParity = LCR_PAR_ODD;
1936                         dbg("%s - parity = odd", __func__);
1937                 } else {
1938                         lParity = LCR_PAR_EVEN;
1939                         dbg("%s - parity = even", __func__);
1940                 }
1941
1942         } else {
1943                 dbg("%s - parity = none", __func__);
1944         }
1945
1946         if (cflag & CMSPAR)
1947                 lParity = lParity | 0x20;
1948
1949         /* Change the Stop bit */
1950         if (cflag & CSTOPB) {
1951                 lStop = LCR_STOP_2;
1952                 dbg("%s - stop bits = 2", __func__);
1953         } else {
1954                 lStop = LCR_STOP_1;
1955                 dbg("%s - stop bits = 1", __func__);
1956         }
1957
1958         /* Update the LCR with the correct value */
1959         mos7840_port->shadowLCR &=
1960             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1961         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1962
1963         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
1964             mos7840_port->shadowLCR);
1965         /* Disable Interrupts */
1966         Data = 0x00;
1967         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1968
1969         Data = 0x00;
1970         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1971
1972         Data = 0xcf;
1973         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1974
1975         /* Send the updated LCR value to the mos7840 */
1976         Data = mos7840_port->shadowLCR;
1977
1978         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1979
1980         Data = 0x00b;
1981         mos7840_port->shadowMCR = Data;
1982         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1983         Data = 0x00b;
1984         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1985
1986         /* set up the MCR register and send it to the mos7840 */
1987
1988         mos7840_port->shadowMCR = MCR_MASTER_IE;
1989         if (cflag & CBAUD)
1990                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1991
1992         if (cflag & CRTSCTS)
1993                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1994         else
1995                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1996
1997         Data = mos7840_port->shadowMCR;
1998         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1999
2000         /* Determine divisor based on baud rate */
2001         baud = tty_get_baud_rate(tty);
2002
2003         if (!baud) {
2004                 /* pick a default, any default... */
2005                 dbg("%s", "Picked default baud...");
2006                 baud = 9600;
2007         }
2008
2009         dbg("%s - baud rate = %d", __func__, baud);
2010         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2011
2012         /* Enable Interrupts */
2013         Data = 0x0c;
2014         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2015
2016         if (mos7840_port->read_urb_busy == false) {
2017                 mos7840_port->read_urb->dev = serial->dev;
2018                 mos7840_port->read_urb_busy = true;
2019                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2020                 if (status) {
2021                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2022                             status);
2023                         mos7840_port->read_urb_busy = false;
2024                 }
2025         }
2026         wake_up(&mos7840_port->delta_msr_wait);
2027         mos7840_port->delta_msr_cond = 1;
2028         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2029             mos7840_port->shadowLCR);
2030
2031         return;
2032 }
2033
2034 /*****************************************************************************
2035  * mos7840_set_termios
2036  *      this function is called by the tty driver when it wants to change
2037  *      the termios structure
2038  *****************************************************************************/
2039
2040 static void mos7840_set_termios(struct tty_struct *tty,
2041                                 struct usb_serial_port *port,
2042                                 struct ktermios *old_termios)
2043 {
2044         int status;
2045         unsigned int cflag;
2046         struct usb_serial *serial;
2047         struct moschip_port *mos7840_port;
2048         dbg("mos7840_set_termios: START");
2049         if (mos7840_port_paranoia_check(port, __func__)) {
2050                 dbg("%s", "Invalid port");
2051                 return;
2052         }
2053
2054         serial = port->serial;
2055
2056         if (mos7840_serial_paranoia_check(serial, __func__)) {
2057                 dbg("%s", "Invalid Serial");
2058                 return;
2059         }
2060
2061         mos7840_port = mos7840_get_port_private(port);
2062
2063         if (mos7840_port == NULL)
2064                 return;
2065
2066         if (!mos7840_port->open) {
2067                 dbg("%s - port not opened", __func__);
2068                 return;
2069         }
2070
2071         dbg("%s", "setting termios - ");
2072
2073         cflag = tty->termios->c_cflag;
2074
2075         dbg("%s - clfag %08x iflag %08x", __func__,
2076             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2077         dbg("%s - old clfag %08x old iflag %08x", __func__,
2078             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2079         dbg("%s - port %d", __func__, port->number);
2080
2081         /* change the port settings to the new ones specified */
2082
2083         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2084
2085         if (!mos7840_port->read_urb) {
2086                 dbg("%s", "URB KILLED !!!!!");
2087                 return;
2088         }
2089
2090         if (mos7840_port->read_urb_busy == false) {
2091                 mos7840_port->read_urb->dev = serial->dev;
2092                 mos7840_port->read_urb_busy = true;
2093                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2094                 if (status) {
2095                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2096                             status);
2097                         mos7840_port->read_urb_busy = false;
2098                 }
2099         }
2100         return;
2101 }
2102
2103 /*****************************************************************************
2104  * mos7840_get_lsr_info - get line status register info
2105  *
2106  * Purpose: Let user call ioctl() to get info when the UART physically
2107  *          is emptied.  On bus types like RS485, the transmitter must
2108  *          release the bus after transmitting. This must be done when
2109  *          the transmit shift register is empty, not be done when the
2110  *          transmit holding register is empty.  This functionality
2111  *          allows an RS485 driver to be written in user space.
2112  *****************************************************************************/
2113
2114 static int mos7840_get_lsr_info(struct tty_struct *tty,
2115                                 unsigned int __user *value)
2116 {
2117         int count;
2118         unsigned int result = 0;
2119
2120         count = mos7840_chars_in_buffer(tty);
2121         if (count == 0) {
2122                 dbg("%s -- Empty", __func__);
2123                 result = TIOCSER_TEMT;
2124         }
2125
2126         if (copy_to_user(value, &result, sizeof(int)))
2127                 return -EFAULT;
2128         return 0;
2129 }
2130
2131 /*****************************************************************************
2132  * mos7840_set_modem_info
2133  *      function to set modem info
2134  *****************************************************************************/
2135
2136 /* FIXME: Should be using the model control hooks */
2137
2138 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2139                                   unsigned int cmd, unsigned int __user *value)
2140 {
2141         unsigned int mcr;
2142         unsigned int arg;
2143         __u16 Data;
2144         int status;
2145         struct usb_serial_port *port;
2146
2147         if (mos7840_port == NULL)
2148                 return -1;
2149
2150         port = (struct usb_serial_port *)mos7840_port->port;
2151         if (mos7840_port_paranoia_check(port, __func__)) {
2152                 dbg("%s", "Invalid port");
2153                 return -1;
2154         }
2155
2156         mcr = mos7840_port->shadowMCR;
2157
2158         if (copy_from_user(&arg, value, sizeof(int)))
2159                 return -EFAULT;
2160
2161         switch (cmd) {
2162         case TIOCMBIS:
2163                 if (arg & TIOCM_RTS)
2164                         mcr |= MCR_RTS;
2165                 if (arg & TIOCM_DTR)
2166                         mcr |= MCR_RTS;
2167                 if (arg & TIOCM_LOOP)
2168                         mcr |= MCR_LOOPBACK;
2169                 break;
2170
2171         case TIOCMBIC:
2172                 if (arg & TIOCM_RTS)
2173                         mcr &= ~MCR_RTS;
2174                 if (arg & TIOCM_DTR)
2175                         mcr &= ~MCR_RTS;
2176                 if (arg & TIOCM_LOOP)
2177                         mcr &= ~MCR_LOOPBACK;
2178                 break;
2179
2180         case TIOCMSET:
2181                 /* turn off the RTS and DTR and LOOPBACK
2182                  * and then only turn on what was asked to */
2183                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2184                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2185                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2186                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2187                 break;
2188         }
2189
2190         lock_kernel();
2191         mos7840_port->shadowMCR = mcr;
2192
2193         Data = mos7840_port->shadowMCR;
2194         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2195         unlock_kernel();
2196         if (status < 0) {
2197                 dbg("setting MODEM_CONTROL_REGISTER Failed");
2198                 return -1;
2199         }
2200
2201         return 0;
2202 }
2203
2204 /*****************************************************************************
2205  * mos7840_get_modem_info
2206  *      function to get modem info
2207  *****************************************************************************/
2208
2209 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2210                                   unsigned int __user *value)
2211 {
2212         unsigned int result = 0;
2213         __u16 msr;
2214         unsigned int mcr = mos7840_port->shadowMCR;
2215         mos7840_get_uart_reg(mos7840_port->port,
2216                                                 MODEM_STATUS_REGISTER, &msr);
2217         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2218             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2219             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2220             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2221             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2222             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2223
2224         dbg("%s -- %x", __func__, result);
2225
2226         if (copy_to_user(value, &result, sizeof(int)))
2227                 return -EFAULT;
2228         return 0;
2229 }
2230
2231 /*****************************************************************************
2232  * mos7840_get_serial_info
2233  *      function to get information about serial port
2234  *****************************************************************************/
2235
2236 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2237                                    struct serial_struct __user *retinfo)
2238 {
2239         struct serial_struct tmp;
2240
2241         if (mos7840_port == NULL)
2242                 return -1;
2243
2244         if (!retinfo)
2245                 return -EFAULT;
2246
2247         memset(&tmp, 0, sizeof(tmp));
2248
2249         tmp.type = PORT_16550A;
2250         tmp.line = mos7840_port->port->serial->minor;
2251         tmp.port = mos7840_port->port->number;
2252         tmp.irq = 0;
2253         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2254         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2255         tmp.baud_base = 9600;
2256         tmp.close_delay = 5 * HZ;
2257         tmp.closing_wait = 30 * HZ;
2258
2259         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2260                 return -EFAULT;
2261         return 0;
2262 }
2263
2264 /*****************************************************************************
2265  * SerialIoctl
2266  *      this function handles any ioctl calls to the driver
2267  *****************************************************************************/
2268
2269 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2270                          unsigned int cmd, unsigned long arg)
2271 {
2272         struct usb_serial_port *port = tty->driver_data;
2273         void __user *argp = (void __user *)arg;
2274         struct moschip_port *mos7840_port;
2275
2276         struct async_icount cnow;
2277         struct async_icount cprev;
2278         struct serial_icounter_struct icount;
2279         int mosret = 0;
2280
2281         if (mos7840_port_paranoia_check(port, __func__)) {
2282                 dbg("%s", "Invalid port");
2283                 return -1;
2284         }
2285
2286         mos7840_port = mos7840_get_port_private(port);
2287
2288         if (mos7840_port == NULL)
2289                 return -1;
2290
2291         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2292
2293         switch (cmd) {
2294                 /* return number of bytes available */
2295
2296         case TIOCSERGETLSR:
2297                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2298                 return mos7840_get_lsr_info(tty, argp);
2299                 return 0;
2300
2301         /* FIXME: use the modem hooks and remove this */
2302         case TIOCMBIS:
2303         case TIOCMBIC:
2304         case TIOCMSET:
2305                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2306                     port->number);
2307                 mosret =
2308                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2309                 return mosret;
2310
2311         case TIOCMGET:
2312                 dbg("%s (%d) TIOCMGET", __func__, port->number);
2313                 return mos7840_get_modem_info(mos7840_port, argp);
2314
2315         case TIOCGSERIAL:
2316                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2317                 return mos7840_get_serial_info(mos7840_port, argp);
2318
2319         case TIOCSSERIAL:
2320                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2321                 break;
2322
2323         case TIOCMIWAIT:
2324                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2325                 cprev = mos7840_port->icount;
2326                 while (1) {
2327                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2328                         mos7840_port->delta_msr_cond = 0;
2329                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2330                                                  (mos7840_port->
2331                                                   delta_msr_cond == 1));
2332
2333                         /* see if a signal did it */
2334                         if (signal_pending(current))
2335                                 return -ERESTARTSYS;
2336                         cnow = mos7840_port->icount;
2337                         smp_rmb();
2338                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2339                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2340                                 return -EIO;    /* no change => error */
2341                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2342                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2343                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2344                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2345                                 return 0;
2346                         }
2347                         cprev = cnow;
2348                 }
2349                 /* NOTREACHED */
2350                 break;
2351
2352         case TIOCGICOUNT:
2353                 cnow = mos7840_port->icount;
2354                 smp_rmb();
2355                 icount.cts = cnow.cts;
2356                 icount.dsr = cnow.dsr;
2357                 icount.rng = cnow.rng;
2358                 icount.dcd = cnow.dcd;
2359                 icount.rx = cnow.rx;
2360                 icount.tx = cnow.tx;
2361                 icount.frame = cnow.frame;
2362                 icount.overrun = cnow.overrun;
2363                 icount.parity = cnow.parity;
2364                 icount.brk = cnow.brk;
2365                 icount.buf_overrun = cnow.buf_overrun;
2366
2367                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2368                     port->number, icount.rx, icount.tx);
2369                 if (copy_to_user(argp, &icount, sizeof(icount)))
2370                         return -EFAULT;
2371                 return 0;
2372         default:
2373                 break;
2374         }
2375         return -ENOIOCTLCMD;
2376 }
2377
2378 static int mos7840_calc_num_ports(struct usb_serial *serial)
2379 {
2380         int mos7840_num_ports = 0;
2381
2382         dbg("numberofendpoints: cur %d, alt %d",
2383             (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2384             (int)serial->interface->altsetting->desc.bNumEndpoints);
2385         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2386                 mos7840_num_ports = serial->num_ports = 2;
2387         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2388                 serial->num_bulk_in = 4;
2389                 serial->num_bulk_out = 4;
2390                 mos7840_num_ports = serial->num_ports = 4;
2391         }
2392         dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2393         return mos7840_num_ports;
2394 }
2395
2396 /****************************************************************************
2397  * mos7840_startup
2398  ****************************************************************************/
2399
2400 static int mos7840_startup(struct usb_serial *serial)
2401 {
2402         struct moschip_port *mos7840_port;
2403         struct usb_device *dev;
2404         int i, status;
2405
2406         __u16 Data;
2407         dbg("%s", "mos7840_startup :Entering..........");
2408
2409         if (!serial) {
2410                 dbg("%s", "Invalid Handler");
2411                 return -1;
2412         }
2413
2414         dev = serial->dev;
2415
2416         dbg("%s", "Entering...");
2417         dbg ("mos7840_startup: serial = %p", serial);
2418
2419         /* we set up the pointers to the endpoints in the mos7840_open *
2420          * function, as the structures aren't created yet.             */
2421
2422         /* set up port private structures */
2423         for (i = 0; i < serial->num_ports; ++i) {
2424                 dbg ("mos7840_startup: configuring port %d............", i);
2425                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2426                 if (mos7840_port == NULL) {
2427                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2428                         status = -ENOMEM;
2429                         i--; /* don't follow NULL pointer cleaning up */
2430                         goto error;
2431                 }
2432
2433                 /* Initialize all port interrupt end point to port 0 int
2434                  * endpoint. Our device has only one interrupt end point
2435                  * common to all port */
2436
2437                 mos7840_port->port = serial->port[i];
2438                 mos7840_set_port_private(serial->port[i], mos7840_port);
2439                 spin_lock_init(&mos7840_port->pool_lock);
2440
2441                 /* minor is not initialised until later by
2442                  * usb-serial.c:get_free_serial() and cannot therefore be used
2443                  * to index device instances */
2444                 mos7840_port->port_num = i + 1;
2445                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2446                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2447                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2448                 dbg ("serial->minor = %d", serial->minor);
2449
2450                 if (mos7840_port->port_num == 1) {
2451                         mos7840_port->SpRegOffset = 0x0;
2452                         mos7840_port->ControlRegOffset = 0x1;
2453                         mos7840_port->DcrRegOffset = 0x4;
2454                 } else if ((mos7840_port->port_num == 2)
2455                            && (serial->num_ports == 4)) {
2456                         mos7840_port->SpRegOffset = 0x8;
2457                         mos7840_port->ControlRegOffset = 0x9;
2458                         mos7840_port->DcrRegOffset = 0x16;
2459                 } else if ((mos7840_port->port_num == 2)
2460                            && (serial->num_ports == 2)) {
2461                         mos7840_port->SpRegOffset = 0xa;
2462                         mos7840_port->ControlRegOffset = 0xb;
2463                         mos7840_port->DcrRegOffset = 0x19;
2464                 } else if ((mos7840_port->port_num == 3)
2465                            && (serial->num_ports == 4)) {
2466                         mos7840_port->SpRegOffset = 0xa;
2467                         mos7840_port->ControlRegOffset = 0xb;
2468                         mos7840_port->DcrRegOffset = 0x19;
2469                 } else if ((mos7840_port->port_num == 4)
2470                            && (serial->num_ports == 4)) {
2471                         mos7840_port->SpRegOffset = 0xc;
2472                         mos7840_port->ControlRegOffset = 0xd;
2473                         mos7840_port->DcrRegOffset = 0x1c;
2474                 }
2475                 mos7840_dump_serial_port(mos7840_port);
2476                 mos7840_set_port_private(serial->port[i], mos7840_port);
2477
2478                 /* enable rx_disable bit in control register */
2479                 status = mos7840_get_reg_sync(serial->port[i],
2480                                  mos7840_port->ControlRegOffset, &Data);
2481                 if (status < 0) {
2482                         dbg("Reading ControlReg failed status-0x%x", status);
2483                         break;
2484                 } else
2485                         dbg("ControlReg Reading success val is %x, status%d",
2486                             Data, status);
2487                 Data |= 0x08;   /* setting driver done bit */
2488                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2489                                    modem status reg */
2490
2491                 /* Data |= 0x20; //rx_disable bit */
2492                 status = mos7840_set_reg_sync(serial->port[i],
2493                                          mos7840_port->ControlRegOffset, Data);
2494                 if (status < 0) {
2495                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2496                         break;
2497                 } else
2498                         dbg("ControlReg Writing success(rx_disable) status%d",
2499                             status);
2500
2501                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2502                    and 0x24 in DCR3 */
2503                 Data = 0x01;
2504                 status = mos7840_set_reg_sync(serial->port[i],
2505                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2506                 if (status < 0) {
2507                         dbg("Writing DCR0 failed status-0x%x", status);
2508                         break;
2509                 } else
2510                         dbg("DCR0 Writing success status%d", status);
2511
2512                 Data = 0x05;
2513                 status = mos7840_set_reg_sync(serial->port[i],
2514                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2515                 if (status < 0) {
2516                         dbg("Writing DCR1 failed status-0x%x", status);
2517                         break;
2518                 } else
2519                         dbg("DCR1 Writing success status%d", status);
2520
2521                 Data = 0x24;
2522                 status = mos7840_set_reg_sync(serial->port[i],
2523                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2524                 if (status < 0) {
2525                         dbg("Writing DCR2 failed status-0x%x", status);
2526                         break;
2527                 } else
2528                         dbg("DCR2 Writing success status%d", status);
2529
2530                 /* write values in clkstart0x0 and clkmulti 0x20 */
2531                 Data = 0x0;
2532                 status = mos7840_set_reg_sync(serial->port[i],
2533                                          CLK_START_VALUE_REGISTER, Data);
2534                 if (status < 0) {
2535                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2536                         break;
2537                 } else
2538                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2539
2540                 Data = 0x20;
2541                 status = mos7840_set_reg_sync(serial->port[i],
2542                                         CLK_MULTI_REGISTER, Data);
2543                 if (status < 0) {
2544                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2545                             status);
2546                         goto error;
2547                 } else
2548                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2549                             status);
2550
2551                 /* write value 0x0 to scratchpad register */
2552                 Data = 0x00;
2553                 status = mos7840_set_uart_reg(serial->port[i],
2554                                                 SCRATCH_PAD_REGISTER, Data);
2555                 if (status < 0) {
2556                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2557                             status);
2558                         break;
2559                 } else
2560                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2561                             status);
2562
2563                 /* Zero Length flag register */
2564                 if ((mos7840_port->port_num != 1)
2565                     && (serial->num_ports == 2)) {
2566
2567                         Data = 0xff;
2568                         status = mos7840_set_reg_sync(serial->port[i],
2569                                       (__u16) (ZLP_REG1 +
2570                                       ((__u16)mos7840_port->port_num)), Data);
2571                         dbg("ZLIP offset %x",
2572                             (__u16) (ZLP_REG1 +
2573                                         ((__u16) mos7840_port->port_num)));
2574                         if (status < 0) {
2575                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2576                                     i + 2, status);
2577                                 break;
2578                         } else
2579                                 dbg("ZLP_REG%d Writing success status%d",
2580                                     i + 2, status);
2581                 } else {
2582                         Data = 0xff;
2583                         status = mos7840_set_reg_sync(serial->port[i],
2584                               (__u16) (ZLP_REG1 +
2585                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2586                         dbg("ZLIP offset %x",
2587                             (__u16) (ZLP_REG1 +
2588                                      ((__u16) mos7840_port->port_num) - 0x1));
2589                         if (status < 0) {
2590                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2591                                     i + 1, status);
2592                                 break;
2593                         } else
2594                                 dbg("ZLP_REG%d Writing success status%d",
2595                                     i + 1, status);
2596
2597                 }
2598                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2599                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2600                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2601                                                                 GFP_KERNEL);
2602                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2603                                                         !mos7840_port->dr) {
2604                         status = -ENOMEM;
2605                         goto error;
2606                 }
2607         }
2608         dbg ("mos7840_startup: all ports configured...........");
2609
2610         /* Zero Length flag enable */
2611         Data = 0x0f;
2612         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2613         if (status < 0) {
2614                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2615                 goto error;
2616         } else
2617                 dbg("ZLP_REG5 Writing success status%d", status);
2618
2619         /* setting configuration feature to one */
2620         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2621                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2622         return 0;
2623 error:
2624         for (/* nothing */; i >= 0; i--) {
2625                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2626
2627                 kfree(mos7840_port->dr);
2628                 kfree(mos7840_port->ctrl_buf);
2629                 usb_free_urb(mos7840_port->control_urb);
2630                 kfree(mos7840_port);
2631                 serial->port[i] = NULL;
2632         }
2633         return status;
2634 }
2635
2636 /****************************************************************************
2637  * mos7840_disconnect
2638  *      This function is called whenever the device is removed from the usb bus.
2639  ****************************************************************************/
2640
2641 static void mos7840_disconnect(struct usb_serial *serial)
2642 {
2643         int i;
2644         unsigned long flags;
2645         struct moschip_port *mos7840_port;
2646         dbg("%s", " disconnect :entering..........");
2647
2648         if (!serial) {
2649                 dbg("%s", "Invalid Handler");
2650                 return;
2651         }
2652
2653         /* check for the ports to be closed,close the ports and disconnect */
2654
2655         /* free private structure allocated for serial port  *
2656          * stop reads and writes on all ports                */
2657
2658         for (i = 0; i < serial->num_ports; ++i) {
2659                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2660                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2661                 if (mos7840_port) {
2662                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2663                         mos7840_port->zombie = 1;
2664                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2665                         usb_kill_urb(mos7840_port->control_urb);
2666                 }
2667         }
2668
2669         dbg("%s", "Thank u :: ");
2670
2671 }
2672
2673 /****************************************************************************
2674  * mos7840_release
2675  *      This function is called when the usb_serial structure is freed.
2676  ****************************************************************************/
2677
2678 static void mos7840_release(struct usb_serial *serial)
2679 {
2680         int i;
2681         struct moschip_port *mos7840_port;
2682         dbg("%s", " release :entering..........");
2683
2684         if (!serial) {
2685                 dbg("%s", "Invalid Handler");
2686                 return;
2687         }
2688
2689         /* check for the ports to be closed,close the ports and disconnect */
2690
2691         /* free private structure allocated for serial port  *
2692          * stop reads and writes on all ports                */
2693
2694         for (i = 0; i < serial->num_ports; ++i) {
2695                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2696                 dbg("mos7840_port %d = %p", i, mos7840_port);
2697                 if (mos7840_port) {
2698                         kfree(mos7840_port->ctrl_buf);
2699                         kfree(mos7840_port->dr);
2700                         kfree(mos7840_port);
2701                 }
2702         }
2703
2704         dbg("%s", "Thank u :: ");
2705
2706 }
2707
2708 static struct usb_driver io_driver = {
2709         .name = "mos7840",
2710         .probe = usb_serial_probe,
2711         .disconnect = usb_serial_disconnect,
2712         .id_table = moschip_id_table_combined,
2713         .no_dynamic_id = 1,
2714 };
2715
2716 static struct usb_serial_driver moschip7840_4port_device = {
2717         .driver = {
2718                    .owner = THIS_MODULE,
2719                    .name = "mos7840",
2720                    },
2721         .description = DRIVER_DESC,
2722         .usb_driver = &io_driver,
2723         .id_table = moschip_port_id_table,
2724         .num_ports = 4,
2725         .open = mos7840_open,
2726         .close = mos7840_close,
2727         .write = mos7840_write,
2728         .write_room = mos7840_write_room,
2729         .chars_in_buffer = mos7840_chars_in_buffer,
2730         .throttle = mos7840_throttle,
2731         .unthrottle = mos7840_unthrottle,
2732         .calc_num_ports = mos7840_calc_num_ports,
2733 #ifdef MCSSerialProbe
2734         .probe = mos7840_serial_probe,
2735 #endif
2736         .ioctl = mos7840_ioctl,
2737         .set_termios = mos7840_set_termios,
2738         .break_ctl = mos7840_break,
2739         .tiocmget = mos7840_tiocmget,
2740         .tiocmset = mos7840_tiocmset,
2741         .attach = mos7840_startup,
2742         .disconnect = mos7840_disconnect,
2743         .release = mos7840_release,
2744         .read_bulk_callback = mos7840_bulk_in_callback,
2745         .read_int_callback = mos7840_interrupt_callback,
2746 };
2747
2748 /****************************************************************************
2749  * moschip7840_init
2750  *      This is called by the module subsystem, or on startup to initialize us
2751  ****************************************************************************/
2752 static int __init moschip7840_init(void)
2753 {
2754         int retval;
2755
2756         dbg("%s", " mos7840_init :entering..........");
2757
2758         /* Register with the usb serial */
2759         retval = usb_serial_register(&moschip7840_4port_device);
2760
2761         if (retval)
2762                 goto failed_port_device_register;
2763
2764         dbg("%s", "Entering...");
2765         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2766                DRIVER_DESC "\n");
2767
2768         /* Register with the usb */
2769         retval = usb_register(&io_driver);
2770         if (retval == 0) {
2771                 dbg("%s", "Leaving...");
2772                 return 0;
2773         }
2774         usb_serial_deregister(&moschip7840_4port_device);
2775 failed_port_device_register:
2776         return retval;
2777 }
2778
2779 /****************************************************************************
2780  * moschip7840_exit
2781  *      Called when the driver is about to be unloaded.
2782  ****************************************************************************/
2783 static void __exit moschip7840_exit(void)
2784 {
2785
2786         dbg("%s", " mos7840_exit :entering..........");
2787
2788         usb_deregister(&io_driver);
2789
2790         usb_serial_deregister(&moschip7840_4port_device);
2791
2792         dbg("%s", "Entering...");
2793 }
2794
2795 module_init(moschip7840_init);
2796 module_exit(moschip7840_exit);
2797
2798 /* Module information */
2799 MODULE_DESCRIPTION(DRIVER_DESC);
2800 MODULE_LICENSE("GPL");
2801
2802 module_param(debug, bool, S_IRUGO | S_IWUSR);
2803 MODULE_PARM_DESC(debug, "Debug enabled or not");