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_USO9ML2_2       0xAC22
 125 #define BANDB_DEVICE_ID_USO9ML2_4       0xAC24
 126 #define BANDB_DEVICE_ID_US9ML2_2        0xAC29
 127 #define BANDB_DEVICE_ID_US9ML2_4        0xAC30
 128 #define BANDB_DEVICE_ID_USPTL4_2        0xAC31
 129 #define BANDB_DEVICE_ID_USPTL4_4        0xAC32
 130 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 131 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 132
 133 /* This driver also supports
 134  * ATEN UC2324 device using Moschip MCS7840
 135  * ATEN UC2322 device using Moschip MCS7820
 136  */
 137 #define USB_VENDOR_ID_ATENINTL          0x0557
 138 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 139 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 140
 141 /* Interrupt Routine Defines    */
 142
 143 #define SERIAL_IIR_RLS      0x06
 144 #define SERIAL_IIR_MS       0x00
 145
 146 /*
 147  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 148  */
 149 #define SERIAL_LSR_DR       0x0001
 150 #define SERIAL_LSR_OE       0x0002
 151 #define SERIAL_LSR_PE       0x0004
 152 #define SERIAL_LSR_FE       0x0008
 153 #define SERIAL_LSR_BI       0x0010
 154
 155 #define MOS_MSR_DELTA_CTS   0x10
 156 #define MOS_MSR_DELTA_DSR   0x20
 157 #define MOS_MSR_DELTA_RI    0x40
 158 #define MOS_MSR_DELTA_CD    0x80
 159
 160 /* Serial Port register Address */
 161 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 162 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 163 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 164 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 165 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 166 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 167 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 168 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 169 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 170
 171 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 172 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 173
 174 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 175
 176 /*
 177  * URB POOL related defines
 178  */
 179 #define NUM_URBS                        16      /* URB Count */
 180 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 181
 182
 183 static struct usb_device_id moschip_port_id_table[] = {
 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_USO9ML2_2)},
 187         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 188         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 189         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 190         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 191         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 194         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 195         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 196         {}                      /* terminating entry */
 197 };
 198
 199 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 200         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 201         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 208         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 209         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 210         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 211         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 212         {}                      /* terminating entry */
 213 };
 214
 215 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 216
 217 /* This structure holds all of the local port information */
 218
 219 struct moschip_port {
 220         int port_num;           /*Actual port number in the device(1,2,etc) */
 221         struct urb *write_urb;  /* write URB for this port */
 222         struct urb *read_urb;   /* read URB for this port */
 223         struct urb *int_urb;
 224         __u8 shadowLCR;         /* last LCR value received */
 225         __u8 shadowMCR;         /* last MCR value received */
 226         char open;
 227         char open_ports;
 228         char zombie;
 229         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 230         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 231         int delta_msr_cond;
 232         struct async_icount icount;
 233         struct usb_serial_port *port;   /* loop back to the owner of this object */
 234
 235         /* Offsets */
 236         __u8 SpRegOffset;
 237         __u8 ControlRegOffset;
 238         __u8 DcrRegOffset;
 239         /* for processing control URBS in interrupt context */
 240         struct urb *control_urb;
 241         struct usb_ctrlrequest *dr;
 242         char *ctrl_buf;
 243         int MsrLsr;
 244
 245         spinlock_t pool_lock;
 246         struct urb *write_urb_pool[NUM_URBS];
 247         char busy[NUM_URBS];
 248         bool read_urb_busy;
 249 };
 250
 251
 252 static int debug;
 253
 254 /*
 255  * mos7840_set_reg_sync
 256  *      To set the Control register by calling usb_fill_control_urb function
 257  *      by passing usb_sndctrlpipe function as parameter.
 258  */
 259
 260 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 261                                 __u16 val)
 262 {
 263         struct usb_device *dev = port->serial->dev;
 264         val = val & 0x00ff;
 265         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 266
 267         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 268                                MCS_WR_RTYPE, val, reg, NULL, 0,
 269                                MOS_WDR_TIMEOUT);
 270 }
 271
 272 /*
 273  * mos7840_get_reg_sync
 274  *      To set the Uart register by calling usb_fill_control_urb function by
 275  *      passing usb_rcvctrlpipe function as parameter.
 276  */
 277
 278 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 279                                 __u16 *val)
 280 {
 281         struct usb_device *dev = port->serial->dev;
 282         int ret = 0;
 283
 284         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 285                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 286                               MOS_WDR_TIMEOUT);
 287         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 288         *val = (*val) & 0x00ff;
 289         return ret;
 290 }
 291
 292 /*
 293  * mos7840_set_uart_reg
 294  *      To set the Uart register by calling usb_fill_control_urb function by
 295  *      passing usb_sndctrlpipe function as parameter.
 296  */
 297
 298 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 299                                 __u16 val)
 300 {
 301
 302         struct usb_device *dev = port->serial->dev;
 303         val = val & 0x00ff;
 304         /* For the UART control registers, the application number need
 305            to be Or'ed */
 306         if (port->serial->num_ports == 4) {
 307                 val |= (((__u16) port->number -
 308                                 (__u16) (port->serial->minor)) + 1) << 8;
 309                 dbg("mos7840_set_uart_reg application number is %x", val);
 310         } else {
 311                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 312                         val |= (((__u16) port->number -
 313                               (__u16) (port->serial->minor)) + 1) << 8;
 314                         dbg("mos7840_set_uart_reg application number is %x",
 315                             val);
 316                 } else {
 317                         val |=
 318                             (((__u16) port->number -
 319                               (__u16) (port->serial->minor)) + 2) << 8;
 320                         dbg("mos7840_set_uart_reg application number is %x",
 321                             val);
 322                 }
 323         }
 324         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 325                                MCS_WR_RTYPE, val, reg, NULL, 0,
 326                                MOS_WDR_TIMEOUT);
 327
 328 }
 329
 330 /*
 331  * mos7840_get_uart_reg
 332  *      To set the Control register by calling usb_fill_control_urb function
 333  *      by passing usb_rcvctrlpipe function as parameter.
 334  */
 335 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 336                                 __u16 *val)
 337 {
 338         struct usb_device *dev = port->serial->dev;
 339         int ret = 0;
 340         __u16 Wval;
 341
 342         /* dbg("application number is %4x",
 343             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 344         /* Wval  is same as application number */
 345         if (port->serial->num_ports == 4) {
 346                 Wval =
 347                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 348                      1) << 8;
 349                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 350         } else {
 351                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 352                         Wval = (((__u16) port->number -
 353                               (__u16) (port->serial->minor)) + 1) << 8;
 354                         dbg("mos7840_get_uart_reg application number is %x",
 355                             Wval);
 356                 } else {
 357                         Wval = (((__u16) port->number -
 358                               (__u16) (port->serial->minor)) + 2) << 8;
 359                         dbg("mos7840_get_uart_reg application number is %x",
 360                             Wval);
 361                 }
 362         }
 363         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 364                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 365                               MOS_WDR_TIMEOUT);
 366         *val = (*val) & 0x00ff;
 367         return ret;
 368 }
 369
 370 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 371 {
 372
 373         dbg("***************************************");
 374         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 375         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 376         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 377         dbg("***************************************");
 378
 379 }
 380
 381 /************************************************************************/
 382 /************************************************************************/
 383 /*             I N T E R F A C E   F U N C T I O N S                    */
 384 /*             I N T E R F A C E   F U N C T I O N S                    */
 385 /************************************************************************/
 386 /************************************************************************/
 387
 388 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 389                                             struct moschip_port *data)
 390 {
 391         usb_set_serial_port_data(port, (void *)data);
 392 }
 393
 394 static inline struct moschip_port *mos7840_get_port_private(struct
 395                                                             usb_serial_port
 396                                                             *port)
 397 {
 398         return (struct moschip_port *)usb_get_serial_port_data(port);
 399 }
 400
 401 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 402 {
 403         struct moschip_port *mos7840_port;
 404         struct async_icount *icount;
 405         mos7840_port = port;
 406         icount = &mos7840_port->icount;
 407         if (new_msr &
 408             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 409              MOS_MSR_DELTA_CD)) {
 410                 icount = &mos7840_port->icount;
 411
 412                 /* update input line counters */
 413                 if (new_msr & MOS_MSR_DELTA_CTS) {
 414                         icount->cts++;
 415                         smp_wmb();
 416                 }
 417                 if (new_msr & MOS_MSR_DELTA_DSR) {
 418                         icount->dsr++;
 419                         smp_wmb();
 420                 }
 421                 if (new_msr & MOS_MSR_DELTA_CD) {
 422                         icount->dcd++;
 423                         smp_wmb();
 424                 }
 425                 if (new_msr & MOS_MSR_DELTA_RI) {
 426                         icount->rng++;
 427                         smp_wmb();
 428                 }
 429         }
 430 }
 431
 432 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 433 {
 434         struct async_icount *icount;
 435
 436         dbg("%s - %02x", __func__, new_lsr);
 437
 438         if (new_lsr & SERIAL_LSR_BI) {
 439                 /*
 440                  * Parity and Framing errors only count if they
 441                  * occur exclusive of a break being
 442                  * received.
 443                  */
 444                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 445         }
 446
 447         /* update input line counters */
 448         icount = &port->icount;
 449         if (new_lsr & SERIAL_LSR_BI) {
 450                 icount->brk++;
 451                 smp_wmb();
 452         }
 453         if (new_lsr & SERIAL_LSR_OE) {
 454                 icount->overrun++;
 455                 smp_wmb();
 456         }
 457         if (new_lsr & SERIAL_LSR_PE) {
 458                 icount->parity++;
 459                 smp_wmb();
 460         }
 461         if (new_lsr & SERIAL_LSR_FE) {
 462                 icount->frame++;
 463                 smp_wmb();
 464         }
 465 }
 466
 467 /************************************************************************/
 468 /************************************************************************/
 469 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 470 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 471 /************************************************************************/
 472 /************************************************************************/
 473
 474 static void mos7840_control_callback(struct urb *urb)
 475 {
 476         unsigned char *data;
 477         struct moschip_port *mos7840_port;
 478         __u8 regval = 0x0;
 479         int result = 0;
 480         int status = urb->status;
 481
 482         mos7840_port = urb->context;
 483
 484         switch (status) {
 485         case 0:
 486                 /* success */
 487                 break;
 488         case -ECONNRESET:
 489         case -ENOENT:
 490         case -ESHUTDOWN:
 491                 /* this urb is terminated, clean up */
 492                 dbg("%s - urb shutting down with status: %d", __func__,
 493                     status);
 494                 return;
 495         default:
 496                 dbg("%s - nonzero urb status received: %d", __func__,
 497                     status);
 498                 goto exit;
 499         }
 500
 501         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 502         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 503             mos7840_port->MsrLsr, mos7840_port->port_num);
 504         data = urb->transfer_buffer;
 505         regval = (__u8) data[0];
 506         dbg("%s data is %x", __func__, regval);
 507         if (mos7840_port->MsrLsr == 0)
 508                 mos7840_handle_new_msr(mos7840_port, regval);
 509         else if (mos7840_port->MsrLsr == 1)
 510                 mos7840_handle_new_lsr(mos7840_port, regval);
 511
 512 exit:
 513         spin_lock(&mos7840_port->pool_lock);
 514         if (!mos7840_port->zombie)
 515                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 516         spin_unlock(&mos7840_port->pool_lock);
 517         if (result) {
 518                 dev_err(&urb->dev->dev,
 519                         "%s - Error %d submitting interrupt urb\n",
 520                         __func__, result);
 521         }
 522 }
 523
 524 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 525                            __u16 *val)
 526 {
 527         struct usb_device *dev = mcs->port->serial->dev;
 528         struct usb_ctrlrequest *dr = mcs->dr;
 529         unsigned char *buffer = mcs->ctrl_buf;
 530         int ret;
 531
 532         dr->bRequestType = MCS_RD_RTYPE;
 533         dr->bRequest = MCS_RDREQ;
 534         dr->wValue = cpu_to_le16(Wval); /* 0 */
 535         dr->wIndex = cpu_to_le16(reg);
 536         dr->wLength = cpu_to_le16(2);
 537
 538         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 539                              (unsigned char *)dr, buffer, 2,
 540                              mos7840_control_callback, mcs);
 541         mcs->control_urb->transfer_buffer_length = 2;
 542         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 543         return ret;
 544 }
 545
 546 /*****************************************************************************
 547  * mos7840_interrupt_callback
 548  *      this is the callback function for when we have received data on the
 549  *      interrupt endpoint.
 550  *****************************************************************************/
 551
 552 static void mos7840_interrupt_callback(struct urb *urb)
 553 {
 554         int result;
 555         int length;
 556         struct moschip_port *mos7840_port;
 557         struct usb_serial *serial;
 558         __u16 Data;
 559         unsigned char *data;
 560         __u8 sp[5], st;
 561         int i, rv = 0;
 562         __u16 wval, wreg = 0;
 563         int status = urb->status;
 564
 565         dbg("%s", " : Entering");
 566
 567         switch (status) {
 568         case 0:
 569                 /* success */
 570                 break;
 571         case -ECONNRESET:
 572         case -ENOENT:
 573         case -ESHUTDOWN:
 574                 /* this urb is terminated, clean up */
 575                 dbg("%s - urb shutting down with status: %d", __func__,
 576                     status);
 577                 return;
 578         default:
 579                 dbg("%s - nonzero urb status received: %d", __func__,
 580                     status);
 581                 goto exit;
 582         }
 583
 584         length = urb->actual_length;
 585         data = urb->transfer_buffer;
 586
 587         serial = urb->context;
 588
 589         /* Moschip get 5 bytes
 590          * Byte 1 IIR Port 1 (port.number is 0)
 591          * Byte 2 IIR Port 2 (port.number is 1)
 592          * Byte 3 IIR Port 3 (port.number is 2)
 593          * Byte 4 IIR Port 4 (port.number is 3)
 594          * Byte 5 FIFO status for both */
 595
 596         if (length && length > 5) {
 597                 dbg("%s", "Wrong data !!!");
 598                 return;
 599         }
 600
 601         sp[0] = (__u8) data[0];
 602         sp[1] = (__u8) data[1];
 603         sp[2] = (__u8) data[2];
 604         sp[3] = (__u8) data[3];
 605         st = (__u8) data[4];
 606
 607         for (i = 0; i < serial->num_ports; i++) {
 608                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 609                 wval =
 610                     (((__u16) serial->port[i]->number -
 611                       (__u16) (serial->minor)) + 1) << 8;
 612                 if (mos7840_port->open) {
 613                         if (sp[i] & 0x01) {
 614                                 dbg("SP%d No Interrupt !!!", i);
 615                         } else {
 616                                 switch (sp[i] & 0x0f) {
 617                                 case SERIAL_IIR_RLS:
 618                                         dbg("Serial Port %d: Receiver status error or ", i);
 619                                         dbg("address bit detected in 9-bit mode");
 620                                         mos7840_port->MsrLsr = 1;
 621                                         wreg = LINE_STATUS_REGISTER;
 622                                         break;
 623                                 case SERIAL_IIR_MS:
 624                                         dbg("Serial Port %d: Modem status change", i);
 625                                         mos7840_port->MsrLsr = 0;
 626                                         wreg = MODEM_STATUS_REGISTER;
 627                                         break;
 628                                 }
 629                                 spin_lock(&mos7840_port->pool_lock);
 630                                 if (!mos7840_port->zombie) {
 631                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 632                                 } else {
 633                                         spin_unlock(&mos7840_port->pool_lock);
 634                                         return;
 635                                 }
 636                                 spin_unlock(&mos7840_port->pool_lock);
 637                         }
 638                 }
 639         }
 640         if (!(rv < 0))
 641                 /* the completion handler for the control urb will resubmit */
 642                 return;
 643 exit:
 644         result = usb_submit_urb(urb, GFP_ATOMIC);
 645         if (result) {
 646                 dev_err(&urb->dev->dev,
 647                         "%s - Error %d submitting interrupt urb\n",
 648                         __func__, result);
 649         }
 650 }
 651
 652 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 653                                        const char *function)
 654 {
 655         if (!port) {
 656                 dbg("%s - port == NULL", function);
 657                 return -1;
 658         }
 659         if (!port->serial) {
 660                 dbg("%s - port->serial == NULL", function);
 661                 return -1;
 662         }
 663
 664         return 0;
 665 }
 666
 667 /* Inline functions to check the sanity of a pointer that is passed to us */
 668 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 669                                          const char *function)
 670 {
 671         if (!serial) {
 672                 dbg("%s - serial == NULL", function);
 673                 return -1;
 674         }
 675         if (!serial->type) {
 676                 dbg("%s - serial->type == NULL!", function);
 677                 return -1;
 678         }
 679
 680         return 0;
 681 }
 682
 683 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 684                                                  const char *function)
 685 {
 686         /* if no port was specified, or it fails a paranoia check */
 687         if (!port ||
 688             mos7840_port_paranoia_check(port, function) ||
 689             mos7840_serial_paranoia_check(port->serial, function)) {
 690                 /* then say that we don't have a valid usb_serial thing,
 691                  * which will end up genrating -ENODEV return values */
 692                 return NULL;
 693         }
 694
 695         return port->serial;
 696 }
 697
 698 /*****************************************************************************
 699  * mos7840_bulk_in_callback
 700  *      this is the callback function for when we have received data on the
 701  *      bulk in endpoint.
 702  *****************************************************************************/
 703
 704 static void mos7840_bulk_in_callback(struct urb *urb)
 705 {
 706         int retval;
 707         unsigned char *data;
 708         struct usb_serial *serial;
 709         struct usb_serial_port *port;
 710         struct moschip_port *mos7840_port;
 711         struct tty_struct *tty;
 712         int status = urb->status;
 713
 714         mos7840_port = urb->context;
 715         if (!mos7840_port) {
 716                 dbg("%s", "NULL mos7840_port pointer");
 717                 mos7840_port->read_urb_busy = false;
 718                 return;
 719         }
 720
 721         if (status) {
 722                 dbg("nonzero read bulk status received: %d", status);
 723                 mos7840_port->read_urb_busy = false;
 724                 return;
 725         }
 726
 727         port = (struct usb_serial_port *)mos7840_port->port;
 728         if (mos7840_port_paranoia_check(port, __func__)) {
 729                 dbg("%s", "Port Paranoia failed");
 730                 mos7840_port->read_urb_busy = false;
 731                 return;
 732         }
 733
 734         serial = mos7840_get_usb_serial(port, __func__);
 735         if (!serial) {
 736                 dbg("%s", "Bad serial pointer");
 737                 mos7840_port->read_urb_busy = false;
 738                 return;
 739         }
 740
 741         dbg("%s", "Entering... ");
 742
 743         data = urb->transfer_buffer;
 744
 745         dbg("%s", "Entering ...........");
 746
 747         if (urb->actual_length) {
 748                 tty = tty_port_tty_get(&mos7840_port->port->port);
 749                 if (tty) {
 750                         tty_buffer_request_room(tty, urb->actual_length);
 751                         tty_insert_flip_string(tty, data, urb->actual_length);
 752                         dbg(" %s ", data);
 753                         tty_flip_buffer_push(tty);
 754                         tty_kref_put(tty);
 755                 }
 756                 mos7840_port->icount.rx += urb->actual_length;
 757                 smp_wmb();
 758                 dbg("mos7840_port->icount.rx is %d:",
 759                     mos7840_port->icount.rx);
 760         }
 761
 762         if (!mos7840_port->read_urb) {
 763                 dbg("%s", "URB KILLED !!!");
 764                 mos7840_port->read_urb_busy = false;
 765                 return;
 766         }
 767
 768
 769         mos7840_port->read_urb->dev = serial->dev;
 770
 771         mos7840_port->read_urb_busy = true;
 772         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 773
 774         if (retval) {
 775                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 776                 mos7840_port->read_urb_busy = false;
 777         }
 778 }
 779
 780 /*****************************************************************************
 781  * mos7840_bulk_out_data_callback
 782  *      this is the callback function for when we have finished sending
 783  *      serial data on the bulk out endpoint.
 784  *****************************************************************************/
 785
 786 static void mos7840_bulk_out_data_callback(struct urb *urb)
 787 {
 788         struct moschip_port *mos7840_port;
 789         struct tty_struct *tty;
 790         int status = urb->status;
 791         int i;
 792
 793         mos7840_port = urb->context;
 794         spin_lock(&mos7840_port->pool_lock);
 795         for (i = 0; i < NUM_URBS; i++) {
 796                 if (urb == mos7840_port->write_urb_pool[i]) {
 797                         mos7840_port->busy[i] = 0;
 798                         break;
 799                 }
 800         }
 801         spin_unlock(&mos7840_port->pool_lock);
 802
 803         if (status) {
 804                 dbg("nonzero write bulk status received:%d", status);
 805                 return;
 806         }
 807
 808         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 809                 dbg("%s", "Port Paranoia failed");
 810                 return;
 811         }
 812
 813         dbg("%s", "Entering .........");
 814
 815         tty = tty_port_tty_get(&mos7840_port->port->port);
 816         if (tty && mos7840_port->open)
 817                 tty_wakeup(tty);
 818         tty_kref_put(tty);
 819
 820 }
 821
 822 /************************************************************************/
 823 /*       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       */
 824 /************************************************************************/
 825 #ifdef MCSSerialProbe
 826 static int mos7840_serial_probe(struct usb_serial *serial,
 827                                 const struct usb_device_id *id)
 828 {
 829
 830         /*need to implement the mode_reg reading and updating\
 831            structures usb_serial_ device_type\
 832            (i.e num_ports, num_bulkin,bulkout etc) */
 833         /* Also we can update the changes  attach */
 834         return 1;
 835 }
 836 #endif
 837
 838 /*****************************************************************************
 839  * mos7840_open
 840  *      this function is called by the tty driver when a port is opened
 841  *      If successful, we return 0
 842  *      Otherwise we return a negative error number.
 843  *****************************************************************************/
 844
 845 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 846 {
 847         int response;
 848         int j;
 849         struct usb_serial *serial;
 850         struct urb *urb;
 851         __u16 Data;
 852         int status;
 853         struct moschip_port *mos7840_port;
 854         struct moschip_port *port0;
 855
 856         dbg ("%s enter", __func__);
 857
 858         if (mos7840_port_paranoia_check(port, __func__)) {
 859                 dbg("%s", "Port Paranoia failed");
 860                 return -ENODEV;
 861         }
 862
 863         serial = port->serial;
 864
 865         if (mos7840_serial_paranoia_check(serial, __func__)) {
 866                 dbg("%s", "Serial Paranoia failed");
 867                 return -ENODEV;
 868         }
 869
 870         mos7840_port = mos7840_get_port_private(port);
 871         port0 = mos7840_get_port_private(serial->port[0]);
 872
 873         if (mos7840_port == NULL || port0 == NULL)
 874                 return -ENODEV;
 875
 876         usb_clear_halt(serial->dev, port->write_urb->pipe);
 877         usb_clear_halt(serial->dev, port->read_urb->pipe);
 878         port0->open_ports++;
 879
 880         /* Initialising the write urb pool */
 881         for (j = 0; j < NUM_URBS; ++j) {
 882                 urb = usb_alloc_urb(0, GFP_KERNEL);
 883                 mos7840_port->write_urb_pool[j] = urb;
 884
 885                 if (urb == NULL) {
 886                         dev_err(&port->dev, "No more urbs???\n");
 887                         continue;
 888                 }
 889
 890                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 891                                                                 GFP_KERNEL);
 892                 if (!urb->transfer_buffer) {
 893                         usb_free_urb(urb);
 894                         mos7840_port->write_urb_pool[j] = NULL;
 895                         dev_err(&port->dev,
 896                                 "%s-out of memory for urb buffers.\n",
 897                                 __func__);
 898                         continue;
 899                 }
 900         }
 901
 902 /*****************************************************************************
 903  * Initialize MCS7840 -- Write Init values to corresponding Registers
 904  *
 905  * Register Index
 906  * 1 : IER
 907  * 2 : FCR
 908  * 3 : LCR
 909  * 4 : MCR
 910  *
 911  * 0x08 : SP1/2 Control Reg
 912  *****************************************************************************/
 913
 914         /* NEED to check the following Block */
 915
 916         Data = 0x0;
 917         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 918         if (status < 0) {
 919                 dbg("Reading Spreg failed");
 920                 return -1;
 921         }
 922         Data |= 0x80;
 923         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 924         if (status < 0) {
 925                 dbg("writing Spreg failed");
 926                 return -1;
 927         }
 928
 929         Data &= ~0x80;
 930         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 931         if (status < 0) {
 932                 dbg("writing Spreg failed");
 933                 return -1;
 934         }
 935         /* End of block to be checked */
 936
 937         Data = 0x0;
 938         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 939                                                                         &Data);
 940         if (status < 0) {
 941                 dbg("Reading Controlreg failed");
 942                 return -1;
 943         }
 944         Data |= 0x08;           /* Driver done bit */
 945         Data |= 0x20;           /* rx_disable */
 946         status = mos7840_set_reg_sync(port,
 947                                 mos7840_port->ControlRegOffset, Data);
 948         if (status < 0) {
 949                 dbg("writing Controlreg failed");
 950                 return -1;
 951         }
 952         /* do register settings here */
 953         /* Set all regs to the device default values. */
 954         /***********************************
 955          * First Disable all interrupts.
 956          ***********************************/
 957         Data = 0x00;
 958         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 959         if (status < 0) {
 960                 dbg("disabling interrupts failed");
 961                 return -1;
 962         }
 963         /* Set FIFO_CONTROL_REGISTER to the default value */
 964         Data = 0x00;
 965         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 966         if (status < 0) {
 967                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 968                 return -1;
 969         }
 970
 971         Data = 0xcf;
 972         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 973         if (status < 0) {
 974                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 975                 return -1;
 976         }
 977
 978         Data = 0x03;
 979         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 980         mos7840_port->shadowLCR = Data;
 981
 982         Data = 0x0b;
 983         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 984         mos7840_port->shadowMCR = Data;
 985
 986         Data = 0x00;
 987         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 988         mos7840_port->shadowLCR = Data;
 989
 990         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 991         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 992
 993         Data = 0x0c;
 994         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 995
 996         Data = 0x0;
 997         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 998
 999         Data = 0x00;
1000         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1001
1002         Data = Data & ~SERIAL_LCR_DLAB;
1003         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1004         mos7840_port->shadowLCR = Data;
1005
1006         /* clearing Bulkin and Bulkout Fifo */
1007         Data = 0x0;
1008         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1009
1010         Data = Data | 0x0c;
1011         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1012
1013         Data = Data & ~0x0c;
1014         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1015         /* Finally enable all interrupts */
1016         Data = 0x0c;
1017         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1018
1019         /* clearing rx_disable */
1020         Data = 0x0;
1021         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1022                                                                         &Data);
1023         Data = Data & ~0x20;
1024         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1025                                                                         Data);
1026
1027         /* rx_negate */
1028         Data = 0x0;
1029         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1030                                                                         &Data);
1031         Data = Data | 0x10;
1032         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1033                                                                         Data);
1034
1035         /* Check to see if we've set up our endpoint info yet    *
1036          * (can't set it up in mos7840_startup as the structures *
1037          * were not set up at that time.)                        */
1038         if (port0->open_ports == 1) {
1039                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1040                         /* set up interrupt urb */
1041                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1042                                 serial->dev,
1043                                 usb_rcvintpipe(serial->dev,
1044                                 serial->port[0]->interrupt_in_endpointAddress),
1045                                 serial->port[0]->interrupt_in_buffer,
1046                                 serial->port[0]->interrupt_in_urb->
1047                                 transfer_buffer_length,
1048                                 mos7840_interrupt_callback,
1049                                 serial,
1050                                 serial->port[0]->interrupt_in_urb->interval);
1051
1052                         /* start interrupt read for mos7840               *
1053                          * will continue as long as mos7840 is connected  */
1054
1055                         response =
1056                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1057                                            GFP_KERNEL);
1058                         if (response) {
1059                                 dev_err(&port->dev, "%s - Error %d submitting "
1060                                         "interrupt urb\n", __func__, response);
1061                         }
1062
1063                 }
1064
1065         }
1066
1067         /* see if we've set up our endpoint info yet   *
1068          * (can't set it up in mos7840_startup as the  *
1069          * structures were not set up at that time.)   */
1070
1071         dbg("port number is %d", port->number);
1072         dbg("serial number is %d", port->serial->minor);
1073         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1074         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1075         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1076         dbg("port's number in the device is %d", mos7840_port->port_num);
1077         mos7840_port->read_urb = port->read_urb;
1078
1079         /* set up our bulk in urb */
1080
1081         usb_fill_bulk_urb(mos7840_port->read_urb,
1082                           serial->dev,
1083                           usb_rcvbulkpipe(serial->dev,
1084                                           port->bulk_in_endpointAddress),
1085                           port->bulk_in_buffer,
1086                           mos7840_port->read_urb->transfer_buffer_length,
1087                           mos7840_bulk_in_callback, mos7840_port);
1088
1089         dbg("mos7840_open: bulkin endpoint is %d",
1090             port->bulk_in_endpointAddress);
1091         mos7840_port->read_urb_busy = true;
1092         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1093         if (response) {
1094                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1095                         __func__, response);
1096                 mos7840_port->read_urb_busy = false;
1097         }
1098
1099         /* initialize our wait queues */
1100         init_waitqueue_head(&mos7840_port->wait_chase);
1101         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1102
1103         /* initialize our icount structure */
1104         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1105
1106         /* initialize our port settings */
1107         /* Must set to enable ints! */
1108         mos7840_port->shadowMCR = MCR_MASTER_IE;
1109         /* send a open port command */
1110         mos7840_port->open = 1;
1111         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1112         mos7840_port->icount.tx = 0;
1113         mos7840_port->icount.rx = 0;
1114
1115         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1116                                 serial, mos7840_port, port);
1117
1118         dbg ("%s leave", __func__);
1119
1120         return 0;
1121
1122 }
1123
1124 /*****************************************************************************
1125  * mos7840_chars_in_buffer
1126  *      this function is called by the tty driver when it wants to know how many
1127  *      bytes of data we currently have outstanding in the port (data that has
1128  *      been written, but hasn't made it out the port yet)
1129  *      If successful, we return the number of bytes left to be written in the
1130  *      system,
1131  *      Otherwise we return zero.
1132  *****************************************************************************/
1133
1134 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1135 {
1136         struct usb_serial_port *port = tty->driver_data;
1137         int i;
1138         int chars = 0;
1139         unsigned long flags;
1140         struct moschip_port *mos7840_port;
1141
1142         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1143
1144         if (mos7840_port_paranoia_check(port, __func__)) {
1145                 dbg("%s", "Invalid port");
1146                 return 0;
1147         }
1148
1149         mos7840_port = mos7840_get_port_private(port);
1150         if (mos7840_port == NULL) {
1151                 dbg("%s", "mos7840_break:leaving ...........");
1152                 return 0;
1153         }
1154
1155         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1156         for (i = 0; i < NUM_URBS; ++i)
1157                 if (mos7840_port->busy[i])
1158                         chars += URB_TRANSFER_BUFFER_SIZE;
1159         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1160         dbg("%s - returns %d", __func__, chars);
1161         return chars;
1162
1163 }
1164
1165 /*****************************************************************************
1166  * mos7840_close
1167  *      this function is called by the tty driver when a port is closed
1168  *****************************************************************************/
1169
1170 static void mos7840_close(struct usb_serial_port *port)
1171 {
1172         struct usb_serial *serial;
1173         struct moschip_port *mos7840_port;
1174         struct moschip_port *port0;
1175         int j;
1176         __u16 Data;
1177
1178         dbg("%s", "mos7840_close:entering...");
1179
1180         if (mos7840_port_paranoia_check(port, __func__)) {
1181                 dbg("%s", "Port Paranoia failed");
1182                 return;
1183         }
1184
1185         serial = mos7840_get_usb_serial(port, __func__);
1186         if (!serial) {
1187                 dbg("%s", "Serial Paranoia failed");
1188                 return;
1189         }
1190
1191         mos7840_port = mos7840_get_port_private(port);
1192         port0 = mos7840_get_port_private(serial->port[0]);
1193
1194         if (mos7840_port == NULL || port0 == NULL)
1195                 return;
1196
1197         for (j = 0; j < NUM_URBS; ++j)
1198                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1199
1200         /* Freeing Write URBs */
1201         for (j = 0; j < NUM_URBS; ++j) {
1202                 if (mos7840_port->write_urb_pool[j]) {
1203                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1204                                 kfree(mos7840_port->write_urb_pool[j]->
1205                                       transfer_buffer);
1206
1207                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1208                 }
1209         }
1210
1211         /* While closing port, shutdown all bulk read, write  *
1212          * and interrupt read if they exists                  */
1213         if (serial->dev) {
1214                 if (mos7840_port->write_urb) {
1215                         dbg("%s", "Shutdown bulk write");
1216                         usb_kill_urb(mos7840_port->write_urb);
1217                 }
1218                 if (mos7840_port->read_urb) {
1219                         dbg("%s", "Shutdown bulk read");
1220                         usb_kill_urb(mos7840_port->read_urb);
1221                         mos7840_port->read_urb_busy = false;
1222                 }
1223                 if ((&mos7840_port->control_urb)) {
1224                         dbg("%s", "Shutdown control read");
1225                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1226                 }
1227         }
1228 /*      if(mos7840_port->ctrl_buf != NULL) */
1229 /*              kfree(mos7840_port->ctrl_buf); */
1230         port0->open_ports--;
1231         dbg("mos7840_num_open_ports in close%d:in port%d",
1232             port0->open_ports, port->number);
1233         if (port0->open_ports == 0) {
1234                 if (serial->port[0]->interrupt_in_urb) {
1235                         dbg("%s", "Shutdown interrupt_in_urb");
1236                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1237                 }
1238         }
1239
1240         if (mos7840_port->write_urb) {
1241                 /* if this urb had a transfer buffer already (old tx) free it */
1242                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1243                         kfree(mos7840_port->write_urb->transfer_buffer);
1244                 usb_free_urb(mos7840_port->write_urb);
1245         }
1246
1247         Data = 0x0;
1248         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1249
1250         Data = 0x00;
1251         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1252
1253         mos7840_port->open = 0;
1254
1255         dbg("%s", "Leaving ............");
1256 }
1257
1258 /************************************************************************
1259  *
1260  * mos7840_block_until_chase_response
1261  *
1262  *      This function will block the close until one of the following:
1263  *              1. Response to our Chase comes from mos7840
1264  *              2. A timeout of 10 seconds without activity has expired
1265  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1266  *
1267  ************************************************************************/
1268
1269 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1270                                         struct moschip_port *mos7840_port)
1271 {
1272         int timeout = 1 * HZ;
1273         int wait = 10;
1274         int count;
1275
1276         while (1) {
1277                 count = mos7840_chars_in_buffer(tty);
1278
1279                 /* Check for Buffer status */
1280                 if (count <= 0)
1281                         return;
1282
1283                 /* Block the thread for a while */
1284                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1285                                                timeout);
1286                 /* No activity.. count down section */
1287                 wait--;
1288                 if (wait == 0) {
1289                         dbg("%s - TIMEOUT", __func__);
1290                         return;
1291                 } else {
1292                         /* Reset timeout value back to seconds */
1293                         wait = 10;
1294                 }
1295         }
1296
1297 }
1298
1299 /*****************************************************************************
1300  * mos7840_break
1301  *      this function sends a break to the port
1302  *****************************************************************************/
1303 static void mos7840_break(struct tty_struct *tty, int break_state)
1304 {
1305         struct usb_serial_port *port = tty->driver_data;
1306         unsigned char data;
1307         struct usb_serial *serial;
1308         struct moschip_port *mos7840_port;
1309
1310         dbg("%s", "Entering ...........");
1311         dbg("mos7840_break: Start");
1312
1313         if (mos7840_port_paranoia_check(port, __func__)) {
1314                 dbg("%s", "Port Paranoia failed");
1315                 return;
1316         }
1317
1318         serial = mos7840_get_usb_serial(port, __func__);
1319         if (!serial) {
1320                 dbg("%s", "Serial Paranoia failed");
1321                 return;
1322         }
1323
1324         mos7840_port = mos7840_get_port_private(port);
1325
1326         if (mos7840_port == NULL)
1327                 return;
1328
1329         if (serial->dev)
1330                 /* flush and block until tx is empty */
1331                 mos7840_block_until_chase_response(tty, mos7840_port);
1332
1333         if (break_state == -1)
1334                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1335         else
1336                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1337
1338         /* FIXME: no locking on shadowLCR anywhere in driver */
1339         mos7840_port->shadowLCR = data;
1340         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1341             mos7840_port->shadowLCR);
1342         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1343                              mos7840_port->shadowLCR);
1344
1345         return;
1346 }
1347
1348 /*****************************************************************************
1349  * mos7840_write_room
1350  *      this function is called by the tty driver when it wants to know how many
1351  *      bytes of data we can accept for a specific port.
1352  *      If successful, we return the amount of room that we have for this port
1353  *      Otherwise we return a negative error number.
1354  *****************************************************************************/
1355
1356 static int mos7840_write_room(struct tty_struct *tty)
1357 {
1358         struct usb_serial_port *port = tty->driver_data;
1359         int i;
1360         int room = 0;
1361         unsigned long flags;
1362         struct moschip_port *mos7840_port;
1363
1364         dbg("%s", " mos7840_write_room:entering ...........");
1365
1366         if (mos7840_port_paranoia_check(port, __func__)) {
1367                 dbg("%s", "Invalid port");
1368                 dbg("%s", " mos7840_write_room:leaving ...........");
1369                 return -1;
1370         }
1371
1372         mos7840_port = mos7840_get_port_private(port);
1373         if (mos7840_port == NULL) {
1374                 dbg("%s", "mos7840_break:leaving ...........");
1375                 return -1;
1376         }
1377
1378         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1379         for (i = 0; i < NUM_URBS; ++i) {
1380                 if (!mos7840_port->busy[i])
1381                         room += URB_TRANSFER_BUFFER_SIZE;
1382         }
1383         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1384
1385         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1386         dbg("%s - returns %d", __func__, room);
1387         return room;
1388
1389 }
1390
1391 /*****************************************************************************
1392  * mos7840_write
1393  *      this function is called by the tty driver when data should be written to
1394  *      the port.
1395  *      If successful, we return the number of bytes written, otherwise we
1396  *      return a negative error number.
1397  *****************************************************************************/
1398
1399 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1400                          const unsigned char *data, int count)
1401 {
1402         int status;
1403         int i;
1404         int bytes_sent = 0;
1405         int transfer_size;
1406         unsigned long flags;
1407
1408         struct moschip_port *mos7840_port;
1409         struct usb_serial *serial;
1410         struct urb *urb;
1411         /* __u16 Data; */
1412         const unsigned char *current_position = data;
1413         unsigned char *data1;
1414         dbg("%s", "entering ...........");
1415         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1416                                         mos7840_port->shadowLCR); */
1417
1418 #ifdef NOTMOS7840
1419         Data = 0x00;
1420         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1421         mos7840_port->shadowLCR = Data;
1422         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1423         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1424             mos7840_port->shadowLCR);
1425
1426         /* Data = 0x03; */
1427         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1428         /* mos7840_port->shadowLCR=Data;//Need to add later */
1429
1430         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1431         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1432
1433         /* Data = 0x0c; */
1434         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1435         Data = 0x00;
1436         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1437         dbg("mos7840_write:DLL value is %x", Data);
1438
1439         Data = 0x0;
1440         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1441         dbg("mos7840_write:DLM value is %x", Data);
1442
1443         Data = Data & ~SERIAL_LCR_DLAB;
1444         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1445             mos7840_port->shadowLCR);
1446         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1447 #endif
1448
1449         if (mos7840_port_paranoia_check(port, __func__)) {
1450                 dbg("%s", "Port Paranoia failed");
1451                 return -1;
1452         }
1453
1454         serial = port->serial;
1455         if (mos7840_serial_paranoia_check(serial, __func__)) {
1456                 dbg("%s", "Serial Paranoia failed");
1457                 return -1;
1458         }
1459
1460         mos7840_port = mos7840_get_port_private(port);
1461         if (mos7840_port == NULL) {
1462                 dbg("%s", "mos7840_port is NULL");
1463                 return -1;
1464         }
1465
1466         /* try to find a free urb in the list */
1467         urb = NULL;
1468
1469         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1470         for (i = 0; i < NUM_URBS; ++i) {
1471                 if (!mos7840_port->busy[i]) {
1472                         mos7840_port->busy[i] = 1;
1473                         urb = mos7840_port->write_urb_pool[i];
1474                         dbg("URB:%d", i);
1475                         break;
1476                 }
1477         }
1478         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1479
1480         if (urb == NULL) {
1481                 dbg("%s - no more free urbs", __func__);
1482                 goto exit;
1483         }
1484
1485         if (urb->transfer_buffer == NULL) {
1486                 urb->transfer_buffer =
1487                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1488
1489                 if (urb->transfer_buffer == NULL) {
1490                         dev_err(&port->dev, "%s no more kernel memory...\n",
1491                                 __func__);
1492                         goto exit;
1493                 }
1494         }
1495         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1496
1497         memcpy(urb->transfer_buffer, current_position, transfer_size);
1498
1499         /* fill urb with data and submit  */
1500         usb_fill_bulk_urb(urb,
1501                           serial->dev,
1502                           usb_sndbulkpipe(serial->dev,
1503                                           port->bulk_out_endpointAddress),
1504                           urb->transfer_buffer,
1505                           transfer_size,
1506                           mos7840_bulk_out_data_callback, mos7840_port);
1507
1508         data1 = urb->transfer_buffer;
1509         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1510
1511         /* send it down the pipe */
1512         status = usb_submit_urb(urb, GFP_ATOMIC);
1513
1514         if (status) {
1515                 mos7840_port->busy[i] = 0;
1516                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1517                         "with status = %d\n", __func__, status);
1518                 bytes_sent = status;
1519                 goto exit;
1520         }
1521         bytes_sent = transfer_size;
1522         mos7840_port->icount.tx += transfer_size;
1523         smp_wmb();
1524         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1525 exit:
1526         return bytes_sent;
1527
1528 }
1529
1530 /*****************************************************************************
1531  * mos7840_throttle
1532  *      this function is called by the tty driver when it wants to stop the data
1533  *      being read from the port.
1534  *****************************************************************************/
1535
1536 static void mos7840_throttle(struct tty_struct *tty)
1537 {
1538         struct usb_serial_port *port = tty->driver_data;
1539         struct moschip_port *mos7840_port;
1540         int status;
1541
1542         if (mos7840_port_paranoia_check(port, __func__)) {
1543                 dbg("%s", "Invalid port");
1544                 return;
1545         }
1546
1547         dbg("- port %d", port->number);
1548
1549         mos7840_port = mos7840_get_port_private(port);
1550
1551         if (mos7840_port == NULL)
1552                 return;
1553
1554         if (!mos7840_port->open) {
1555                 dbg("%s", "port not opened");
1556                 return;
1557         }
1558
1559         dbg("%s", "Entering ..........");
1560
1561         /* if we are implementing XON/XOFF, send the stop character */
1562         if (I_IXOFF(tty)) {
1563                 unsigned char stop_char = STOP_CHAR(tty);
1564                 status = mos7840_write(tty, port, &stop_char, 1);
1565                 if (status <= 0)
1566                         return;
1567         }
1568         /* if we are implementing RTS/CTS, toggle that line */
1569         if (tty->termios->c_cflag & CRTSCTS) {
1570                 mos7840_port->shadowMCR &= ~MCR_RTS;
1571                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1572                                          mos7840_port->shadowMCR);
1573                 if (status < 0)
1574                         return;
1575         }
1576
1577         return;
1578 }
1579
1580 /*****************************************************************************
1581  * mos7840_unthrottle
1582  *      this function is called by the tty driver when it wants to resume
1583  *      the data being read from the port (called after mos7840_throttle is
1584  *      called)
1585  *****************************************************************************/
1586 static void mos7840_unthrottle(struct tty_struct *tty)
1587 {
1588         struct usb_serial_port *port = tty->driver_data;
1589         int status;
1590         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1591
1592         if (mos7840_port_paranoia_check(port, __func__)) {
1593                 dbg("%s", "Invalid port");
1594                 return;
1595         }
1596
1597         if (mos7840_port == NULL)
1598                 return;
1599
1600         if (!mos7840_port->open) {
1601                 dbg("%s - port not opened", __func__);
1602                 return;
1603         }
1604
1605         dbg("%s", "Entering ..........");
1606
1607         /* if we are implementing XON/XOFF, send the start character */
1608         if (I_IXOFF(tty)) {
1609                 unsigned char start_char = START_CHAR(tty);
1610                 status = mos7840_write(tty, port, &start_char, 1);
1611                 if (status <= 0)
1612                         return;
1613         }
1614
1615         /* if we are implementing RTS/CTS, toggle that line */
1616         if (tty->termios->c_cflag & CRTSCTS) {
1617                 mos7840_port->shadowMCR |= MCR_RTS;
1618                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1619                                          mos7840_port->shadowMCR);
1620                 if (status < 0)
1621                         return;
1622         }
1623 }
1624
1625 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1626 {
1627         struct usb_serial_port *port = tty->driver_data;
1628         struct moschip_port *mos7840_port;
1629         unsigned int result;
1630         __u16 msr;
1631         __u16 mcr;
1632         int status;
1633         mos7840_port = mos7840_get_port_private(port);
1634
1635         dbg("%s - port %d", __func__, port->number);
1636
1637         if (mos7840_port == NULL)
1638                 return -ENODEV;
1639
1640         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1641         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1642         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1643             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1644             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1645             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1646             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1647             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1648             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1649
1650         dbg("%s - 0x%04X", __func__, result);
1651
1652         return result;
1653 }
1654
1655 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1656                             unsigned int set, unsigned int clear)
1657 {
1658         struct usb_serial_port *port = tty->driver_data;
1659         struct moschip_port *mos7840_port;
1660         unsigned int mcr;
1661         int status;
1662
1663         dbg("%s - port %d", __func__, port->number);
1664
1665         mos7840_port = mos7840_get_port_private(port);
1666
1667         if (mos7840_port == NULL)
1668                 return -ENODEV;
1669
1670         /* FIXME: What locks the port registers ? */
1671         mcr = mos7840_port->shadowMCR;
1672         if (clear & TIOCM_RTS)
1673                 mcr &= ~MCR_RTS;
1674         if (clear & TIOCM_DTR)
1675                 mcr &= ~MCR_DTR;
1676         if (clear & TIOCM_LOOP)
1677                 mcr &= ~MCR_LOOPBACK;
1678
1679         if (set & TIOCM_RTS)
1680                 mcr |= MCR_RTS;
1681         if (set & TIOCM_DTR)
1682                 mcr |= MCR_DTR;
1683         if (set & TIOCM_LOOP)
1684                 mcr |= MCR_LOOPBACK;
1685
1686         mos7840_port->shadowMCR = mcr;
1687
1688         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1689         if (status < 0) {
1690                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1691                 return status;
1692         }
1693
1694         return 0;
1695 }
1696
1697 /*****************************************************************************
1698  * mos7840_calc_baud_rate_divisor
1699  *      this function calculates the proper baud rate divisor for the specified
1700  *      baud rate.
1701  *****************************************************************************/
1702 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1703                                           __u16 *clk_sel_val)
1704 {
1705
1706         dbg("%s - %d", __func__, baudRate);
1707
1708         if (baudRate <= 115200) {
1709                 *divisor = 115200 / baudRate;
1710                 *clk_sel_val = 0x0;
1711         }
1712         if ((baudRate > 115200) && (baudRate <= 230400)) {
1713                 *divisor = 230400 / baudRate;
1714                 *clk_sel_val = 0x10;
1715         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1716                 *divisor = 403200 / baudRate;
1717                 *clk_sel_val = 0x20;
1718         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1719                 *divisor = 460800 / baudRate;
1720                 *clk_sel_val = 0x30;
1721         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1722                 *divisor = 806400 / baudRate;
1723                 *clk_sel_val = 0x40;
1724         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1725                 *divisor = 921600 / baudRate;
1726                 *clk_sel_val = 0x50;
1727         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1728                 *divisor = 1572864 / baudRate;
1729                 *clk_sel_val = 0x60;
1730         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1731                 *divisor = 3145728 / baudRate;
1732                 *clk_sel_val = 0x70;
1733         }
1734         return 0;
1735
1736 #ifdef NOTMCS7840
1737
1738         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1739                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1740                         *divisor = mos7840_divisor_table[i].Divisor;
1741                         return 0;
1742                 }
1743         }
1744
1745         /* After trying for all the standard baud rates    *
1746          * Try calculating the divisor for this baud rate  */
1747
1748         if (baudrate > 75 && baudrate < 230400) {
1749                 /* get the divisor */
1750                 custom = (__u16) (230400L / baudrate);
1751
1752                 /* Check for round off */
1753                 round1 = (__u16) (2304000L / baudrate);
1754                 round = (__u16) (round1 - (custom * 10));
1755                 if (round > 4)
1756                         custom++;
1757                 *divisor = custom;
1758
1759                 dbg(" Baud %d = %d", baudrate, custom);
1760                 return 0;
1761         }
1762
1763         dbg("%s", " Baud calculation Failed...");
1764         return -1;
1765 #endif
1766 }
1767
1768 /*****************************************************************************
1769  * mos7840_send_cmd_write_baud_rate
1770  *      this function sends the proper command to change the baud rate of the
1771  *      specified port.
1772  *****************************************************************************/
1773
1774 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1775                                             int baudRate)
1776 {
1777         int divisor = 0;
1778         int status;
1779         __u16 Data;
1780         unsigned char number;
1781         __u16 clk_sel_val;
1782         struct usb_serial_port *port;
1783
1784         if (mos7840_port == NULL)
1785                 return -1;
1786
1787         port = (struct usb_serial_port *)mos7840_port->port;
1788         if (mos7840_port_paranoia_check(port, __func__)) {
1789                 dbg("%s", "Invalid port");
1790                 return -1;
1791         }
1792
1793         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1794                 dbg("%s", "Invalid Serial");
1795                 return -1;
1796         }
1797
1798         dbg("%s", "Entering ..........");
1799
1800         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1801
1802         dbg("%s - port = %d, baud = %d", __func__,
1803             mos7840_port->port->number, baudRate);
1804         /* reset clk_uart_sel in spregOffset */
1805         if (baudRate > 115200) {
1806 #ifdef HW_flow_control
1807                 /* NOTE: need to see the pther register to modify */
1808                 /* setting h/w flow control bit to 1 */
1809                 Data = 0x2b;
1810                 mos7840_port->shadowMCR = Data;
1811                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1812                                                                         Data);
1813                 if (status < 0) {
1814                         dbg("Writing spreg failed in set_serial_baud");
1815                         return -1;
1816                 }
1817 #endif
1818
1819         } else {
1820 #ifdef HW_flow_control
1821                 / *setting h/w flow control bit to 0 */
1822                 Data = 0xb;
1823                 mos7840_port->shadowMCR = Data;
1824                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1825                                                                         Data);
1826                 if (status < 0) {
1827                         dbg("Writing spreg failed in set_serial_baud");
1828                         return -1;
1829                 }
1830 #endif
1831
1832         }
1833
1834         if (1) {                /* baudRate <= 115200) */
1835                 clk_sel_val = 0x0;
1836                 Data = 0x0;
1837                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1838                                                    &clk_sel_val);
1839                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1840                                                                  &Data);
1841                 if (status < 0) {
1842                         dbg("reading spreg failed in set_serial_baud");
1843                         return -1;
1844                 }
1845                 Data = (Data & 0x8f) | clk_sel_val;
1846                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1847                                                                 Data);
1848                 if (status < 0) {
1849                         dbg("Writing spreg failed in set_serial_baud");
1850                         return -1;
1851                 }
1852                 /* Calculate the Divisor */
1853
1854                 if (status) {
1855                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1856                         return status;
1857                 }
1858                 /* Enable access to divisor latch */
1859                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1860                 mos7840_port->shadowLCR = Data;
1861                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1862
1863                 /* Write the divisor */
1864                 Data = (unsigned char)(divisor & 0xff);
1865                 dbg("set_serial_baud Value to write DLL is %x", Data);
1866                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1867
1868                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1869                 dbg("set_serial_baud Value to write DLM is %x", Data);
1870                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1871
1872                 /* Disable access to divisor latch */
1873                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1874                 mos7840_port->shadowLCR = Data;
1875                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1876
1877         }
1878         return status;
1879 }
1880
1881 /*****************************************************************************
1882  * mos7840_change_port_settings
1883  *      This routine is called to set the UART on the device to match
1884  *      the specified new settings.
1885  *****************************************************************************/
1886
1887 static void mos7840_change_port_settings(struct tty_struct *tty,
1888         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1889 {
1890         int baud;
1891         unsigned cflag;
1892         unsigned iflag;
1893         __u8 lData;
1894         __u8 lParity;
1895         __u8 lStop;
1896         int status;
1897         __u16 Data;
1898         struct usb_serial_port *port;
1899         struct usb_serial *serial;
1900
1901         if (mos7840_port == NULL)
1902                 return;
1903
1904         port = (struct usb_serial_port *)mos7840_port->port;
1905
1906         if (mos7840_port_paranoia_check(port, __func__)) {
1907                 dbg("%s", "Invalid port");
1908                 return;
1909         }
1910
1911         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1912                 dbg("%s", "Invalid Serial");
1913                 return;
1914         }
1915
1916         serial = port->serial;
1917
1918         dbg("%s - port %d", __func__, mos7840_port->port->number);
1919
1920         if (!mos7840_port->open) {
1921                 dbg("%s - port not opened", __func__);
1922                 return;
1923         }
1924
1925         dbg("%s", "Entering ..........");
1926
1927         lData = LCR_BITS_8;
1928         lStop = LCR_STOP_1;
1929         lParity = LCR_PAR_NONE;
1930
1931         cflag = tty->termios->c_cflag;
1932         iflag = tty->termios->c_iflag;
1933
1934         /* Change the number of bits */
1935         if (cflag & CSIZE) {
1936                 switch (cflag & CSIZE) {
1937                 case CS5:
1938                         lData = LCR_BITS_5;
1939                         break;
1940
1941                 case CS6:
1942                         lData = LCR_BITS_6;
1943                         break;
1944
1945                 case CS7:
1946                         lData = LCR_BITS_7;
1947                         break;
1948                 default:
1949                 case CS8:
1950                         lData = LCR_BITS_8;
1951                         break;
1952                 }
1953         }
1954         /* Change the Parity bit */
1955         if (cflag & PARENB) {
1956                 if (cflag & PARODD) {
1957                         lParity = LCR_PAR_ODD;
1958                         dbg("%s - parity = odd", __func__);
1959                 } else {
1960                         lParity = LCR_PAR_EVEN;
1961                         dbg("%s - parity = even", __func__);
1962                 }
1963
1964         } else {
1965                 dbg("%s - parity = none", __func__);
1966         }
1967
1968         if (cflag & CMSPAR)
1969                 lParity = lParity | 0x20;
1970
1971         /* Change the Stop bit */
1972         if (cflag & CSTOPB) {
1973                 lStop = LCR_STOP_2;
1974                 dbg("%s - stop bits = 2", __func__);
1975         } else {
1976                 lStop = LCR_STOP_1;
1977                 dbg("%s - stop bits = 1", __func__);
1978         }
1979
1980         /* Update the LCR with the correct value */
1981         mos7840_port->shadowLCR &=
1982             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1983         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1984
1985         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
1986             mos7840_port->shadowLCR);
1987         /* Disable Interrupts */
1988         Data = 0x00;
1989         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1990
1991         Data = 0x00;
1992         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1993
1994         Data = 0xcf;
1995         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1996
1997         /* Send the updated LCR value to the mos7840 */
1998         Data = mos7840_port->shadowLCR;
1999
2000         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2001
2002         Data = 0x00b;
2003         mos7840_port->shadowMCR = Data;
2004         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2005         Data = 0x00b;
2006         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2007
2008         /* set up the MCR register and send it to the mos7840 */
2009
2010         mos7840_port->shadowMCR = MCR_MASTER_IE;
2011         if (cflag & CBAUD)
2012                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2013
2014         if (cflag & CRTSCTS)
2015                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2016         else
2017                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2018
2019         Data = mos7840_port->shadowMCR;
2020         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2021
2022         /* Determine divisor based on baud rate */
2023         baud = tty_get_baud_rate(tty);
2024
2025         if (!baud) {
2026                 /* pick a default, any default... */
2027                 dbg("%s", "Picked default baud...");
2028                 baud = 9600;
2029         }
2030
2031         dbg("%s - baud rate = %d", __func__, baud);
2032         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2033
2034         /* Enable Interrupts */
2035         Data = 0x0c;
2036         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2037
2038         if (mos7840_port->read_urb_busy == false) {
2039                 mos7840_port->read_urb->dev = serial->dev;
2040                 mos7840_port->read_urb_busy = true;
2041                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2042                 if (status) {
2043                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2044                             status);
2045                         mos7840_port->read_urb_busy = false;
2046                 }
2047         }
2048         wake_up(&mos7840_port->delta_msr_wait);
2049         mos7840_port->delta_msr_cond = 1;
2050         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2051             mos7840_port->shadowLCR);
2052
2053         return;
2054 }
2055
2056 /*****************************************************************************
2057  * mos7840_set_termios
2058  *      this function is called by the tty driver when it wants to change
2059  *      the termios structure
2060  *****************************************************************************/
2061
2062 static void mos7840_set_termios(struct tty_struct *tty,
2063                                 struct usb_serial_port *port,
2064                                 struct ktermios *old_termios)
2065 {
2066         int status;
2067         unsigned int cflag;
2068         struct usb_serial *serial;
2069         struct moschip_port *mos7840_port;
2070         dbg("mos7840_set_termios: START");
2071         if (mos7840_port_paranoia_check(port, __func__)) {
2072                 dbg("%s", "Invalid port");
2073                 return;
2074         }
2075
2076         serial = port->serial;
2077
2078         if (mos7840_serial_paranoia_check(serial, __func__)) {
2079                 dbg("%s", "Invalid Serial");
2080                 return;
2081         }
2082
2083         mos7840_port = mos7840_get_port_private(port);
2084
2085         if (mos7840_port == NULL)
2086                 return;
2087
2088         if (!mos7840_port->open) {
2089                 dbg("%s - port not opened", __func__);
2090                 return;
2091         }
2092
2093         dbg("%s", "setting termios - ");
2094
2095         cflag = tty->termios->c_cflag;
2096
2097         dbg("%s - clfag %08x iflag %08x", __func__,
2098             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2099         dbg("%s - old clfag %08x old iflag %08x", __func__,
2100             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2101         dbg("%s - port %d", __func__, port->number);
2102
2103         /* change the port settings to the new ones specified */
2104
2105         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2106
2107         if (!mos7840_port->read_urb) {
2108                 dbg("%s", "URB KILLED !!!!!");
2109                 return;
2110         }
2111
2112         if (mos7840_port->read_urb_busy == false) {
2113                 mos7840_port->read_urb->dev = serial->dev;
2114                 mos7840_port->read_urb_busy = true;
2115                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2116                 if (status) {
2117                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2118                             status);
2119                         mos7840_port->read_urb_busy = false;
2120                 }
2121         }
2122         return;
2123 }
2124
2125 /*****************************************************************************
2126  * mos7840_get_lsr_info - get line status register info
2127  *
2128  * Purpose: Let user call ioctl() to get info when the UART physically
2129  *          is emptied.  On bus types like RS485, the transmitter must
2130  *          release the bus after transmitting. This must be done when
2131  *          the transmit shift register is empty, not be done when the
2132  *          transmit holding register is empty.  This functionality
2133  *          allows an RS485 driver to be written in user space.
2134  *****************************************************************************/
2135
2136 static int mos7840_get_lsr_info(struct tty_struct *tty,
2137                                 unsigned int __user *value)
2138 {
2139         int count;
2140         unsigned int result = 0;
2141
2142         count = mos7840_chars_in_buffer(tty);
2143         if (count == 0) {
2144                 dbg("%s -- Empty", __func__);
2145                 result = TIOCSER_TEMT;
2146         }
2147
2148         if (copy_to_user(value, &result, sizeof(int)))
2149                 return -EFAULT;
2150         return 0;
2151 }
2152
2153 /*****************************************************************************
2154  * mos7840_get_serial_info
2155  *      function to get information about serial port
2156  *****************************************************************************/
2157
2158 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2159                                    struct serial_struct __user *retinfo)
2160 {
2161         struct serial_struct tmp;
2162
2163         if (mos7840_port == NULL)
2164                 return -1;
2165
2166         if (!retinfo)
2167                 return -EFAULT;
2168
2169         memset(&tmp, 0, sizeof(tmp));
2170
2171         tmp.type = PORT_16550A;
2172         tmp.line = mos7840_port->port->serial->minor;
2173         tmp.port = mos7840_port->port->number;
2174         tmp.irq = 0;
2175         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2176         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2177         tmp.baud_base = 9600;
2178         tmp.close_delay = 5 * HZ;
2179         tmp.closing_wait = 30 * HZ;
2180
2181         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2182                 return -EFAULT;
2183         return 0;
2184 }
2185
2186 /*****************************************************************************
2187  * SerialIoctl
2188  *      this function handles any ioctl calls to the driver
2189  *****************************************************************************/
2190
2191 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2192                          unsigned int cmd, unsigned long arg)
2193 {
2194         struct usb_serial_port *port = tty->driver_data;
2195         void __user *argp = (void __user *)arg;
2196         struct moschip_port *mos7840_port;
2197
2198         struct async_icount cnow;
2199         struct async_icount cprev;
2200         struct serial_icounter_struct icount;
2201
2202         if (mos7840_port_paranoia_check(port, __func__)) {
2203                 dbg("%s", "Invalid port");
2204                 return -1;
2205         }
2206
2207         mos7840_port = mos7840_get_port_private(port);
2208
2209         if (mos7840_port == NULL)
2210                 return -1;
2211
2212         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2213
2214         switch (cmd) {
2215                 /* return number of bytes available */
2216
2217         case TIOCSERGETLSR:
2218                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2219                 return mos7840_get_lsr_info(tty, argp);
2220                 return 0;
2221
2222         case TIOCGSERIAL:
2223                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2224                 return mos7840_get_serial_info(mos7840_port, argp);
2225
2226         case TIOCSSERIAL:
2227                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2228                 break;
2229
2230         case TIOCMIWAIT:
2231                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2232                 cprev = mos7840_port->icount;
2233                 while (1) {
2234                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2235                         mos7840_port->delta_msr_cond = 0;
2236                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2237                                                  (mos7840_port->
2238                                                   delta_msr_cond == 1));
2239
2240                         /* see if a signal did it */
2241                         if (signal_pending(current))
2242                                 return -ERESTARTSYS;
2243                         cnow = mos7840_port->icount;
2244                         smp_rmb();
2245                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2246                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2247                                 return -EIO;    /* no change => error */
2248                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2249                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2250                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2251                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2252                                 return 0;
2253                         }
2254                         cprev = cnow;
2255                 }
2256                 /* NOTREACHED */
2257                 break;
2258
2259         case TIOCGICOUNT:
2260                 cnow = mos7840_port->icount;
2261                 smp_rmb();
2262                 icount.cts = cnow.cts;
2263                 icount.dsr = cnow.dsr;
2264                 icount.rng = cnow.rng;
2265                 icount.dcd = cnow.dcd;
2266                 icount.rx = cnow.rx;
2267                 icount.tx = cnow.tx;
2268                 icount.frame = cnow.frame;
2269                 icount.overrun = cnow.overrun;
2270                 icount.parity = cnow.parity;
2271                 icount.brk = cnow.brk;
2272                 icount.buf_overrun = cnow.buf_overrun;
2273
2274                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2275                     port->number, icount.rx, icount.tx);
2276                 if (copy_to_user(argp, &icount, sizeof(icount)))
2277                         return -EFAULT;
2278                 return 0;
2279         default:
2280                 break;
2281         }
2282         return -ENOIOCTLCMD;
2283 }
2284
2285 static int mos7840_calc_num_ports(struct usb_serial *serial)
2286 {
2287         int mos7840_num_ports = 0;
2288
2289         dbg("numberofendpoints: cur %d, alt %d",
2290             (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2291             (int)serial->interface->altsetting->desc.bNumEndpoints);
2292         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2293                 mos7840_num_ports = serial->num_ports = 2;
2294         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2295                 serial->num_bulk_in = 4;
2296                 serial->num_bulk_out = 4;
2297                 mos7840_num_ports = serial->num_ports = 4;
2298         }
2299         dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2300         return mos7840_num_ports;
2301 }
2302
2303 /****************************************************************************
2304  * mos7840_startup
2305  ****************************************************************************/
2306
2307 static int mos7840_startup(struct usb_serial *serial)
2308 {
2309         struct moschip_port *mos7840_port;
2310         struct usb_device *dev;
2311         int i, status;
2312
2313         __u16 Data;
2314         dbg("%s", "mos7840_startup :Entering..........");
2315
2316         if (!serial) {
2317                 dbg("%s", "Invalid Handler");
2318                 return -1;
2319         }
2320
2321         dev = serial->dev;
2322
2323         dbg("%s", "Entering...");
2324         dbg ("mos7840_startup: serial = %p", serial);
2325
2326         /* we set up the pointers to the endpoints in the mos7840_open *
2327          * function, as the structures aren't created yet.             */
2328
2329         /* set up port private structures */
2330         for (i = 0; i < serial->num_ports; ++i) {
2331                 dbg ("mos7840_startup: configuring port %d............", i);
2332                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2333                 if (mos7840_port == NULL) {
2334                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2335                         status = -ENOMEM;
2336                         i--; /* don't follow NULL pointer cleaning up */
2337                         goto error;
2338                 }
2339
2340                 /* Initialize all port interrupt end point to port 0 int
2341                  * endpoint. Our device has only one interrupt end point
2342                  * common to all port */
2343
2344                 mos7840_port->port = serial->port[i];
2345                 mos7840_set_port_private(serial->port[i], mos7840_port);
2346                 spin_lock_init(&mos7840_port->pool_lock);
2347
2348                 /* minor is not initialised until later by
2349                  * usb-serial.c:get_free_serial() and cannot therefore be used
2350                  * to index device instances */
2351                 mos7840_port->port_num = i + 1;
2352                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2353                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2354                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2355                 dbg ("serial->minor = %d", serial->minor);
2356
2357                 if (mos7840_port->port_num == 1) {
2358                         mos7840_port->SpRegOffset = 0x0;
2359                         mos7840_port->ControlRegOffset = 0x1;
2360                         mos7840_port->DcrRegOffset = 0x4;
2361                 } else if ((mos7840_port->port_num == 2)
2362                            && (serial->num_ports == 4)) {
2363                         mos7840_port->SpRegOffset = 0x8;
2364                         mos7840_port->ControlRegOffset = 0x9;
2365                         mos7840_port->DcrRegOffset = 0x16;
2366                 } else if ((mos7840_port->port_num == 2)
2367                            && (serial->num_ports == 2)) {
2368                         mos7840_port->SpRegOffset = 0xa;
2369                         mos7840_port->ControlRegOffset = 0xb;
2370                         mos7840_port->DcrRegOffset = 0x19;
2371                 } else if ((mos7840_port->port_num == 3)
2372                            && (serial->num_ports == 4)) {
2373                         mos7840_port->SpRegOffset = 0xa;
2374                         mos7840_port->ControlRegOffset = 0xb;
2375                         mos7840_port->DcrRegOffset = 0x19;
2376                 } else if ((mos7840_port->port_num == 4)
2377                            && (serial->num_ports == 4)) {
2378                         mos7840_port->SpRegOffset = 0xc;
2379                         mos7840_port->ControlRegOffset = 0xd;
2380                         mos7840_port->DcrRegOffset = 0x1c;
2381                 }
2382                 mos7840_dump_serial_port(mos7840_port);
2383                 mos7840_set_port_private(serial->port[i], mos7840_port);
2384
2385                 /* enable rx_disable bit in control register */
2386                 status = mos7840_get_reg_sync(serial->port[i],
2387                                  mos7840_port->ControlRegOffset, &Data);
2388                 if (status < 0) {
2389                         dbg("Reading ControlReg failed status-0x%x", status);
2390                         break;
2391                 } else
2392                         dbg("ControlReg Reading success val is %x, status%d",
2393                             Data, status);
2394                 Data |= 0x08;   /* setting driver done bit */
2395                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2396                                    modem status reg */
2397
2398                 /* Data |= 0x20; //rx_disable bit */
2399                 status = mos7840_set_reg_sync(serial->port[i],
2400                                          mos7840_port->ControlRegOffset, Data);
2401                 if (status < 0) {
2402                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2403                         break;
2404                 } else
2405                         dbg("ControlReg Writing success(rx_disable) status%d",
2406                             status);
2407
2408                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2409                    and 0x24 in DCR3 */
2410                 Data = 0x01;
2411                 status = mos7840_set_reg_sync(serial->port[i],
2412                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2413                 if (status < 0) {
2414                         dbg("Writing DCR0 failed status-0x%x", status);
2415                         break;
2416                 } else
2417                         dbg("DCR0 Writing success status%d", status);
2418
2419                 Data = 0x05;
2420                 status = mos7840_set_reg_sync(serial->port[i],
2421                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2422                 if (status < 0) {
2423                         dbg("Writing DCR1 failed status-0x%x", status);
2424                         break;
2425                 } else
2426                         dbg("DCR1 Writing success status%d", status);
2427
2428                 Data = 0x24;
2429                 status = mos7840_set_reg_sync(serial->port[i],
2430                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2431                 if (status < 0) {
2432                         dbg("Writing DCR2 failed status-0x%x", status);
2433                         break;
2434                 } else
2435                         dbg("DCR2 Writing success status%d", status);
2436
2437                 /* write values in clkstart0x0 and clkmulti 0x20 */
2438                 Data = 0x0;
2439                 status = mos7840_set_reg_sync(serial->port[i],
2440                                          CLK_START_VALUE_REGISTER, Data);
2441                 if (status < 0) {
2442                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2443                         break;
2444                 } else
2445                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2446
2447                 Data = 0x20;
2448                 status = mos7840_set_reg_sync(serial->port[i],
2449                                         CLK_MULTI_REGISTER, Data);
2450                 if (status < 0) {
2451                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2452                             status);
2453                         goto error;
2454                 } else
2455                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2456                             status);
2457
2458                 /* write value 0x0 to scratchpad register */
2459                 Data = 0x00;
2460                 status = mos7840_set_uart_reg(serial->port[i],
2461                                                 SCRATCH_PAD_REGISTER, Data);
2462                 if (status < 0) {
2463                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2464                             status);
2465                         break;
2466                 } else
2467                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2468                             status);
2469
2470                 /* Zero Length flag register */
2471                 if ((mos7840_port->port_num != 1)
2472                     && (serial->num_ports == 2)) {
2473
2474                         Data = 0xff;
2475                         status = mos7840_set_reg_sync(serial->port[i],
2476                                       (__u16) (ZLP_REG1 +
2477                                       ((__u16)mos7840_port->port_num)), Data);
2478                         dbg("ZLIP offset %x",
2479                             (__u16) (ZLP_REG1 +
2480                                         ((__u16) mos7840_port->port_num)));
2481                         if (status < 0) {
2482                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2483                                     i + 2, status);
2484                                 break;
2485                         } else
2486                                 dbg("ZLP_REG%d Writing success status%d",
2487                                     i + 2, status);
2488                 } else {
2489                         Data = 0xff;
2490                         status = mos7840_set_reg_sync(serial->port[i],
2491                               (__u16) (ZLP_REG1 +
2492                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2493                         dbg("ZLIP offset %x",
2494                             (__u16) (ZLP_REG1 +
2495                                      ((__u16) mos7840_port->port_num) - 0x1));
2496                         if (status < 0) {
2497                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2498                                     i + 1, status);
2499                                 break;
2500                         } else
2501                                 dbg("ZLP_REG%d Writing success status%d",
2502                                     i + 1, status);
2503
2504                 }
2505                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2506                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2507                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2508                                                                 GFP_KERNEL);
2509                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2510                                                         !mos7840_port->dr) {
2511                         status = -ENOMEM;
2512                         goto error;
2513                 }
2514         }
2515         dbg ("mos7840_startup: all ports configured...........");
2516
2517         /* Zero Length flag enable */
2518         Data = 0x0f;
2519         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2520         if (status < 0) {
2521                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2522                 goto error;
2523         } else
2524                 dbg("ZLP_REG5 Writing success status%d", status);
2525
2526         /* setting configuration feature to one */
2527         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2528                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2529         return 0;
2530 error:
2531         for (/* nothing */; i >= 0; i--) {
2532                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2533
2534                 kfree(mos7840_port->dr);
2535                 kfree(mos7840_port->ctrl_buf);
2536                 usb_free_urb(mos7840_port->control_urb);
2537                 kfree(mos7840_port);
2538                 serial->port[i] = NULL;
2539         }
2540         return status;
2541 }
2542
2543 /****************************************************************************
2544  * mos7840_disconnect
2545  *      This function is called whenever the device is removed from the usb bus.
2546  ****************************************************************************/
2547
2548 static void mos7840_disconnect(struct usb_serial *serial)
2549 {
2550         int i;
2551         unsigned long flags;
2552         struct moschip_port *mos7840_port;
2553         dbg("%s", " disconnect :entering..........");
2554
2555         if (!serial) {
2556                 dbg("%s", "Invalid Handler");
2557                 return;
2558         }
2559
2560         /* check for the ports to be closed,close the ports and disconnect */
2561
2562         /* free private structure allocated for serial port  *
2563          * stop reads and writes on all ports                */
2564
2565         for (i = 0; i < serial->num_ports; ++i) {
2566                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2567                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2568                 if (mos7840_port) {
2569                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2570                         mos7840_port->zombie = 1;
2571                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2572                         usb_kill_urb(mos7840_port->control_urb);
2573                 }
2574         }
2575
2576         dbg("%s", "Thank u :: ");
2577
2578 }
2579
2580 /****************************************************************************
2581  * mos7840_release
2582  *      This function is called when the usb_serial structure is freed.
2583  ****************************************************************************/
2584
2585 static void mos7840_release(struct usb_serial *serial)
2586 {
2587         int i;
2588         struct moschip_port *mos7840_port;
2589         dbg("%s", " release :entering..........");
2590
2591         if (!serial) {
2592                 dbg("%s", "Invalid Handler");
2593                 return;
2594         }
2595
2596         /* check for the ports to be closed,close the ports and disconnect */
2597
2598         /* free private structure allocated for serial port  *
2599          * stop reads and writes on all ports                */
2600
2601         for (i = 0; i < serial->num_ports; ++i) {
2602                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2603                 dbg("mos7840_port %d = %p", i, mos7840_port);
2604                 if (mos7840_port) {
2605                         kfree(mos7840_port->ctrl_buf);
2606                         kfree(mos7840_port->dr);
2607                         kfree(mos7840_port);
2608                 }
2609         }
2610
2611         dbg("%s", "Thank u :: ");
2612
2613 }
2614
2615 static struct usb_driver io_driver = {
2616         .name = "mos7840",
2617         .probe = usb_serial_probe,
2618         .disconnect = usb_serial_disconnect,
2619         .id_table = moschip_id_table_combined,
2620         .no_dynamic_id = 1,
2621 };
2622
2623 static struct usb_serial_driver moschip7840_4port_device = {
2624         .driver = {
2625                    .owner = THIS_MODULE,
2626                    .name = "mos7840",
2627                    },
2628         .description = DRIVER_DESC,
2629         .usb_driver = &io_driver,
2630         .id_table = moschip_port_id_table,
2631         .num_ports = 4,
2632         .open = mos7840_open,
2633         .close = mos7840_close,
2634         .write = mos7840_write,
2635         .write_room = mos7840_write_room,
2636         .chars_in_buffer = mos7840_chars_in_buffer,
2637         .throttle = mos7840_throttle,
2638         .unthrottle = mos7840_unthrottle,
2639         .calc_num_ports = mos7840_calc_num_ports,
2640 #ifdef MCSSerialProbe
2641         .probe = mos7840_serial_probe,
2642 #endif
2643         .ioctl = mos7840_ioctl,
2644         .set_termios = mos7840_set_termios,
2645         .break_ctl = mos7840_break,
2646         .tiocmget = mos7840_tiocmget,
2647         .tiocmset = mos7840_tiocmset,
2648         .attach = mos7840_startup,
2649         .disconnect = mos7840_disconnect,
2650         .release = mos7840_release,
2651         .read_bulk_callback = mos7840_bulk_in_callback,
2652         .read_int_callback = mos7840_interrupt_callback,
2653 };
2654
2655 /****************************************************************************
2656  * moschip7840_init
2657  *      This is called by the module subsystem, or on startup to initialize us
2658  ****************************************************************************/
2659 static int __init moschip7840_init(void)
2660 {
2661         int retval;
2662
2663         dbg("%s", " mos7840_init :entering..........");
2664
2665         /* Register with the usb serial */
2666         retval = usb_serial_register(&moschip7840_4port_device);
2667
2668         if (retval)
2669                 goto failed_port_device_register;
2670
2671         dbg("%s", "Entering...");
2672         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2673                DRIVER_DESC "\n");
2674
2675         /* Register with the usb */
2676         retval = usb_register(&io_driver);
2677         if (retval == 0) {
2678                 dbg("%s", "Leaving...");
2679                 return 0;
2680         }
2681         usb_serial_deregister(&moschip7840_4port_device);
2682 failed_port_device_register:
2683         return retval;
2684 }
2685
2686 /****************************************************************************
2687  * moschip7840_exit
2688  *      Called when the driver is about to be unloaded.
2689  ****************************************************************************/
2690 static void __exit moschip7840_exit(void)
2691 {
2692
2693         dbg("%s", " mos7840_exit :entering..........");
2694
2695         usb_deregister(&io_driver);
2696
2697         usb_serial_deregister(&moschip7840_4port_device);
2698
2699         dbg("%s", "Entering...");
2700 }
2701
2702 module_init(moschip7840_init);
2703 module_exit(moschip7840_exit);
2704
2705 /* Module information */
2706 MODULE_DESCRIPTION(DRIVER_DESC);
2707 MODULE_LICENSE("GPL");
2708
2709 module_param(debug, bool, S_IRUGO | S_IWUSR);
2710 MODULE_PARM_DESC(debug, "Debug enabled or not");