drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/smp_lock.h>
  30 #include <linux/tty.h>
  31 #include <linux/tty_driver.h>
  32 #include <linux/tty_flip.h>
  33 #include <linux/module.h>
  34 #include <linux/serial.h>
  35 #include <linux/usb.h>
  36 #include <linux/usb/serial.h>
  37 #include <linux/uaccess.h>
  38
  39 /*
  40  * Version Information
  41  */
  42 #define DRIVER_VERSION "1.3.2"
  43 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  44
  45 /*
  46  * 16C50 UART register defines
  47  */
  48
  49 #define LCR_BITS_5             0x00     /* 5 bits/char */
  50 #define LCR_BITS_6             0x01     /* 6 bits/char */
  51 #define LCR_BITS_7             0x02     /* 7 bits/char */
  52 #define LCR_BITS_8             0x03     /* 8 bits/char */
  53 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  54
  55 #define LCR_STOP_1             0x00     /* 1 stop bit */
  56 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  57 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  58 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  59
  60 #define LCR_PAR_NONE           0x00     /* No parity */
  61 #define LCR_PAR_ODD            0x08     /* Odd parity */
  62 #define LCR_PAR_EVEN           0x18     /* Even parity */
  63 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  64 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  65 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  66
  67 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  68 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  69
  70 #define MCR_DTR                0x01     /* Assert DTR */
  71 #define MCR_RTS                0x02     /* Assert RTS */
  72 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  73 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  74 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  75 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  76
  77 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  78 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  79 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  80 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  81
  82 /*
  83  * Defines used for sending commands to port
  84  */
  85
  86 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  87 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  88
  89 #define MOS_PORT1       0x0200
  90 #define MOS_PORT2       0x0300
  91 #define MOS_VENREG      0x0000
  92 #define MOS_MAX_PORT    0x02
  93 #define MOS_WRITE       0x0E
  94 #define MOS_READ        0x0D
  95
  96 /* Requests */
  97 #define MCS_RD_RTYPE    0xC0
  98 #define MCS_WR_RTYPE    0x40
  99 #define MCS_RDREQ       0x0D
 100 #define MCS_WRREQ       0x0E
 101 #define MCS_CTRL_TIMEOUT        500
 102 #define VENDOR_READ_LENGTH      (0x01)
 103
 104 #define MAX_NAME_LEN    64
 105
 106 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 107 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 108
 109 /* For higher baud Rates use TIOCEXBAUD */
 110 #define TIOCEXBAUD     0x5462
 111
 112 /* vendor id and device id defines */
 113
 114 /* The native mos7840/7820 component */
 115 #define USB_VENDOR_ID_MOSCHIP           0x9710
 116 #define MOSCHIP_DEVICE_ID_7840          0x7840
 117 #define MOSCHIP_DEVICE_ID_7820          0x7820
 118 /* The native component can have its vendor/device id's overridden
 119  * in vendor-specific implementations.  Such devices can be handled
 120  * by making a change here, in moschip_port_id_table, and in
 121  * moschip_id_table_combined
 122  */
 123 #define USB_VENDOR_ID_BANDB             0x0856
 124 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 125 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 126
 127 /* This driver also supports
 128  * ATEN UC2324 device using Moschip MCS7840
 129  * ATEN UC2322 device using Moschip MCS7820
 130  */
 131 #define USB_VENDOR_ID_ATENINTL          0x0557
 132 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 133 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 134
 135 /* Interrupt Routine Defines    */
 136
 137 #define SERIAL_IIR_RLS      0x06
 138 #define SERIAL_IIR_MS       0x00
 139
 140 /*
 141  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 142  */
 143 #define SERIAL_LSR_DR       0x0001
 144 #define SERIAL_LSR_OE       0x0002
 145 #define SERIAL_LSR_PE       0x0004
 146 #define SERIAL_LSR_FE       0x0008
 147 #define SERIAL_LSR_BI       0x0010
 148
 149 #define MOS_MSR_DELTA_CTS   0x10
 150 #define MOS_MSR_DELTA_DSR   0x20
 151 #define MOS_MSR_DELTA_RI    0x40
 152 #define MOS_MSR_DELTA_CD    0x80
 153
 154 /* Serial Port register Address */
 155 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 156 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 157 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 158 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 159 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 160 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 161 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 162 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 163 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 164
 165 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 166 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 167
 168 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 169
 170 /*
 171  * URB POOL related defines
 172  */
 173 #define NUM_URBS                        16      /* URB Count */
 174 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 175
 176
 177 static struct usb_device_id moschip_port_id_table[] = {
 178         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 179         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 180         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 181         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 182         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 183         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 184         {}                      /* terminating entry */
 185 };
 186
 187 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 188         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 189         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 190         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 191         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 192         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 193         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 194         {}                      /* terminating entry */
 195 };
 196
 197 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 198
 199 /* This structure holds all of the local port information */
 200
 201 struct moschip_port {
 202         int port_num;           /*Actual port number in the device(1,2,etc) */
 203         struct urb *write_urb;  /* write URB for this port */
 204         struct urb *read_urb;   /* read URB for this port */
 205         struct urb *int_urb;
 206         __u8 shadowLCR;         /* last LCR value received */
 207         __u8 shadowMCR;         /* last MCR value received */
 208         char open;
 209         char open_ports;
 210         char zombie;
 211         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 212         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 213         int delta_msr_cond;
 214         struct async_icount icount;
 215         struct usb_serial_port *port;   /* loop back to the owner of this object */
 216
 217         /* Offsets */
 218         __u8 SpRegOffset;
 219         __u8 ControlRegOffset;
 220         __u8 DcrRegOffset;
 221         /* for processing control URBS in interrupt context */
 222         struct urb *control_urb;
 223         struct usb_ctrlrequest *dr;
 224         char *ctrl_buf;
 225         int MsrLsr;
 226
 227         spinlock_t pool_lock;
 228         struct urb *write_urb_pool[NUM_URBS];
 229         char busy[NUM_URBS];
 230         bool read_urb_busy;
 231 };
 232
 233
 234 static int debug;
 235
 236 /*
 237  * mos7840_set_reg_sync
 238  *      To set the Control register by calling usb_fill_control_urb function
 239  *      by passing usb_sndctrlpipe function as parameter.
 240  */
 241
 242 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 243                                 __u16 val)
 244 {
 245         struct usb_device *dev = port->serial->dev;
 246         val = val & 0x00ff;
 247         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 248
 249         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 250                                MCS_WR_RTYPE, val, reg, NULL, 0,
 251                                MOS_WDR_TIMEOUT);
 252 }
 253
 254 /*
 255  * mos7840_get_reg_sync
 256  *      To set the Uart register by calling usb_fill_control_urb function by
 257  *      passing usb_rcvctrlpipe function as parameter.
 258  */
 259
 260 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 261                                 __u16 *val)
 262 {
 263         struct usb_device *dev = port->serial->dev;
 264         int ret = 0;
 265
 266         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 267                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 268                               MOS_WDR_TIMEOUT);
 269         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 270         *val = (*val) & 0x00ff;
 271         return ret;
 272 }
 273
 274 /*
 275  * mos7840_set_uart_reg
 276  *      To set the Uart register by calling usb_fill_control_urb function by
 277  *      passing usb_sndctrlpipe function as parameter.
 278  */
 279
 280 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 281                                 __u16 val)
 282 {
 283
 284         struct usb_device *dev = port->serial->dev;
 285         val = val & 0x00ff;
 286         /* For the UART control registers, the application number need
 287            to be Or'ed */
 288         if (port->serial->num_ports == 4) {
 289                 val |= (((__u16) port->number -
 290                                 (__u16) (port->serial->minor)) + 1) << 8;
 291                 dbg("mos7840_set_uart_reg application number is %x", val);
 292         } else {
 293                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 294                         val |= (((__u16) port->number -
 295                               (__u16) (port->serial->minor)) + 1) << 8;
 296                         dbg("mos7840_set_uart_reg application number is %x",
 297                             val);
 298                 } else {
 299                         val |=
 300                             (((__u16) port->number -
 301                               (__u16) (port->serial->minor)) + 2) << 8;
 302                         dbg("mos7840_set_uart_reg application number is %x",
 303                             val);
 304                 }
 305         }
 306         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 307                                MCS_WR_RTYPE, val, reg, NULL, 0,
 308                                MOS_WDR_TIMEOUT);
 309
 310 }
 311
 312 /*
 313  * mos7840_get_uart_reg
 314  *      To set the Control register by calling usb_fill_control_urb function
 315  *      by passing usb_rcvctrlpipe function as parameter.
 316  */
 317 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 318                                 __u16 *val)
 319 {
 320         struct usb_device *dev = port->serial->dev;
 321         int ret = 0;
 322         __u16 Wval;
 323
 324         /* dbg("application number is %4x",
 325             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 326         /* Wval  is same as application number */
 327         if (port->serial->num_ports == 4) {
 328                 Wval =
 329                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 330                      1) << 8;
 331                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 332         } else {
 333                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 334                         Wval = (((__u16) port->number -
 335                               (__u16) (port->serial->minor)) + 1) << 8;
 336                         dbg("mos7840_get_uart_reg application number is %x",
 337                             Wval);
 338                 } else {
 339                         Wval = (((__u16) port->number -
 340                               (__u16) (port->serial->minor)) + 2) << 8;
 341                         dbg("mos7840_get_uart_reg application number is %x",
 342                             Wval);
 343                 }
 344         }
 345         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 346                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 347                               MOS_WDR_TIMEOUT);
 348         *val = (*val) & 0x00ff;
 349         return ret;
 350 }
 351
 352 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 353 {
 354
 355         dbg("***************************************");
 356         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 357         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 358         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 359         dbg("***************************************");
 360
 361 }
 362
 363 /************************************************************************/
 364 /************************************************************************/
 365 /*             I N T E R F A C E   F U N C T I O N S                    */
 366 /*             I N T E R F A C E   F U N C T I O N S                    */
 367 /************************************************************************/
 368 /************************************************************************/
 369
 370 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 371                                             struct moschip_port *data)
 372 {
 373         usb_set_serial_port_data(port, (void *)data);
 374 }
 375
 376 static inline struct moschip_port *mos7840_get_port_private(struct
 377                                                             usb_serial_port
 378                                                             *port)
 379 {
 380         return (struct moschip_port *)usb_get_serial_port_data(port);
 381 }
 382
 383 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 384 {
 385         struct moschip_port *mos7840_port;
 386         struct async_icount *icount;
 387         mos7840_port = port;
 388         icount = &mos7840_port->icount;
 389         if (new_msr &
 390             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 391              MOS_MSR_DELTA_CD)) {
 392                 icount = &mos7840_port->icount;
 393
 394                 /* update input line counters */
 395                 if (new_msr & MOS_MSR_DELTA_CTS) {
 396                         icount->cts++;
 397                         smp_wmb();
 398                 }
 399                 if (new_msr & MOS_MSR_DELTA_DSR) {
 400                         icount->dsr++;
 401                         smp_wmb();
 402                 }
 403                 if (new_msr & MOS_MSR_DELTA_CD) {
 404                         icount->dcd++;
 405                         smp_wmb();
 406                 }
 407                 if (new_msr & MOS_MSR_DELTA_RI) {
 408                         icount->rng++;
 409                         smp_wmb();
 410                 }
 411         }
 412 }
 413
 414 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 415 {
 416         struct async_icount *icount;
 417
 418         dbg("%s - %02x", __func__, new_lsr);
 419
 420         if (new_lsr & SERIAL_LSR_BI) {
 421                 /*
 422                  * Parity and Framing errors only count if they
 423                  * occur exclusive of a break being
 424                  * received.
 425                  */
 426                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 427         }
 428
 429         /* update input line counters */
 430         icount = &port->icount;
 431         if (new_lsr & SERIAL_LSR_BI) {
 432                 icount->brk++;
 433                 smp_wmb();
 434         }
 435         if (new_lsr & SERIAL_LSR_OE) {
 436                 icount->overrun++;
 437                 smp_wmb();
 438         }
 439         if (new_lsr & SERIAL_LSR_PE) {
 440                 icount->parity++;
 441                 smp_wmb();
 442         }
 443         if (new_lsr & SERIAL_LSR_FE) {
 444                 icount->frame++;
 445                 smp_wmb();
 446         }
 447 }
 448
 449 /************************************************************************/
 450 /************************************************************************/
 451 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 452 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 453 /************************************************************************/
 454 /************************************************************************/
 455
 456 static void mos7840_control_callback(struct urb *urb)
 457 {
 458         unsigned char *data;
 459         struct moschip_port *mos7840_port;
 460         __u8 regval = 0x0;
 461         int result = 0;
 462         int status = urb->status;
 463
 464         mos7840_port = urb->context;
 465
 466         switch (status) {
 467         case 0:
 468                 /* success */
 469                 break;
 470         case -ECONNRESET:
 471         case -ENOENT:
 472         case -ESHUTDOWN:
 473                 /* this urb is terminated, clean up */
 474                 dbg("%s - urb shutting down with status: %d", __func__,
 475                     status);
 476                 return;
 477         default:
 478                 dbg("%s - nonzero urb status received: %d", __func__,
 479                     status);
 480                 goto exit;
 481         }
 482
 483         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 484         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 485             mos7840_port->MsrLsr, mos7840_port->port_num);
 486         data = urb->transfer_buffer;
 487         regval = (__u8) data[0];
 488         dbg("%s data is %x", __func__, regval);
 489         if (mos7840_port->MsrLsr == 0)
 490                 mos7840_handle_new_msr(mos7840_port, regval);
 491         else if (mos7840_port->MsrLsr == 1)
 492                 mos7840_handle_new_lsr(mos7840_port, regval);
 493
 494 exit:
 495         spin_lock(&mos7840_port->pool_lock);
 496         if (!mos7840_port->zombie)
 497                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 498         spin_unlock(&mos7840_port->pool_lock);
 499         if (result) {
 500                 dev_err(&urb->dev->dev,
 501                         "%s - Error %d submitting interrupt urb\n",
 502                         __func__, result);
 503         }
 504 }
 505
 506 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 507                            __u16 *val)
 508 {
 509         struct usb_device *dev = mcs->port->serial->dev;
 510         struct usb_ctrlrequest *dr = mcs->dr;
 511         unsigned char *buffer = mcs->ctrl_buf;
 512         int ret;
 513
 514         dr->bRequestType = MCS_RD_RTYPE;
 515         dr->bRequest = MCS_RDREQ;
 516         dr->wValue = cpu_to_le16(Wval); /* 0 */
 517         dr->wIndex = cpu_to_le16(reg);
 518         dr->wLength = cpu_to_le16(2);
 519
 520         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 521                              (unsigned char *)dr, buffer, 2,
 522                              mos7840_control_callback, mcs);
 523         mcs->control_urb->transfer_buffer_length = 2;
 524         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 525         return ret;
 526 }
 527
 528 /*****************************************************************************
 529  * mos7840_interrupt_callback
 530  *      this is the callback function for when we have received data on the
 531  *      interrupt endpoint.
 532  *****************************************************************************/
 533
 534 static void mos7840_interrupt_callback(struct urb *urb)
 535 {
 536         int result;
 537         int length;
 538         struct moschip_port *mos7840_port;
 539         struct usb_serial *serial;
 540         __u16 Data;
 541         unsigned char *data;
 542         __u8 sp[5], st;
 543         int i, rv = 0;
 544         __u16 wval, wreg = 0;
 545         int status = urb->status;
 546
 547         dbg("%s", " : Entering");
 548
 549         switch (status) {
 550         case 0:
 551                 /* success */
 552                 break;
 553         case -ECONNRESET:
 554         case -ENOENT:
 555         case -ESHUTDOWN:
 556                 /* this urb is terminated, clean up */
 557                 dbg("%s - urb shutting down with status: %d", __func__,
 558                     status);
 559                 return;
 560         default:
 561                 dbg("%s - nonzero urb status received: %d", __func__,
 562                     status);
 563                 goto exit;
 564         }
 565
 566         length = urb->actual_length;
 567         data = urb->transfer_buffer;
 568
 569         serial = urb->context;
 570
 571         /* Moschip get 5 bytes
 572          * Byte 1 IIR Port 1 (port.number is 0)
 573          * Byte 2 IIR Port 2 (port.number is 1)
 574          * Byte 3 IIR Port 3 (port.number is 2)
 575          * Byte 4 IIR Port 4 (port.number is 3)
 576          * Byte 5 FIFO status for both */
 577
 578         if (length && length > 5) {
 579                 dbg("%s", "Wrong data !!!");
 580                 return;
 581         }
 582
 583         sp[0] = (__u8) data[0];
 584         sp[1] = (__u8) data[1];
 585         sp[2] = (__u8) data[2];
 586         sp[3] = (__u8) data[3];
 587         st = (__u8) data[4];
 588
 589         for (i = 0; i < serial->num_ports; i++) {
 590                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 591                 wval =
 592                     (((__u16) serial->port[i]->number -
 593                       (__u16) (serial->minor)) + 1) << 8;
 594                 if (mos7840_port->open) {
 595                         if (sp[i] & 0x01) {
 596                                 dbg("SP%d No Interrupt !!!", i);
 597                         } else {
 598                                 switch (sp[i] & 0x0f) {
 599                                 case SERIAL_IIR_RLS:
 600                                         dbg("Serial Port %d: Receiver status error or ", i);
 601                                         dbg("address bit detected in 9-bit mode");
 602                                         mos7840_port->MsrLsr = 1;
 603                                         wreg = LINE_STATUS_REGISTER;
 604                                         break;
 605                                 case SERIAL_IIR_MS:
 606                                         dbg("Serial Port %d: Modem status change", i);
 607                                         mos7840_port->MsrLsr = 0;
 608                                         wreg = MODEM_STATUS_REGISTER;
 609                                         break;
 610                                 }
 611                                 spin_lock(&mos7840_port->pool_lock);
 612                                 if (!mos7840_port->zombie) {
 613                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 614                                 } else {
 615                                         spin_unlock(&mos7840_port->pool_lock);
 616                                         return;
 617                                 }
 618                                 spin_unlock(&mos7840_port->pool_lock);
 619                         }
 620                 }
 621         }
 622         if (!(rv < 0))
 623                 /* the completion handler for the control urb will resubmit */
 624                 return;
 625 exit:
 626         result = usb_submit_urb(urb, GFP_ATOMIC);
 627         if (result) {
 628                 dev_err(&urb->dev->dev,
 629                         "%s - Error %d submitting interrupt urb\n",
 630                         __func__, result);
 631         }
 632 }
 633
 634 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 635                                        const char *function)
 636 {
 637         if (!port) {
 638                 dbg("%s - port == NULL", function);
 639                 return -1;
 640         }
 641         if (!port->serial) {
 642                 dbg("%s - port->serial == NULL", function);
 643                 return -1;
 644         }
 645
 646         return 0;
 647 }
 648
 649 /* Inline functions to check the sanity of a pointer that is passed to us */
 650 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 651                                          const char *function)
 652 {
 653         if (!serial) {
 654                 dbg("%s - serial == NULL", function);
 655                 return -1;
 656         }
 657         if (!serial->type) {
 658                 dbg("%s - serial->type == NULL!", function);
 659                 return -1;
 660         }
 661
 662         return 0;
 663 }
 664
 665 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 666                                                  const char *function)
 667 {
 668         /* if no port was specified, or it fails a paranoia check */
 669         if (!port ||
 670             mos7840_port_paranoia_check(port, function) ||
 671             mos7840_serial_paranoia_check(port->serial, function)) {
 672                 /* then say that we don't have a valid usb_serial thing,
 673                  * which will end up genrating -ENODEV return values */
 674                 return NULL;
 675         }
 676
 677         return port->serial;
 678 }
 679
 680 /*****************************************************************************
 681  * mos7840_bulk_in_callback
 682  *      this is the callback function for when we have received data on the
 683  *      bulk in endpoint.
 684  *****************************************************************************/
 685
 686 static void mos7840_bulk_in_callback(struct urb *urb)
 687 {
 688         int retval;
 689         unsigned char *data;
 690         struct usb_serial *serial;
 691         struct usb_serial_port *port;
 692         struct moschip_port *mos7840_port;
 693         struct tty_struct *tty;
 694         int status = urb->status;
 695
 696         mos7840_port = urb->context;
 697         if (!mos7840_port) {
 698                 dbg("%s", "NULL mos7840_port pointer");
 699                 mos7840_port->read_urb_busy = false;
 700                 return;
 701         }
 702
 703         if (status) {
 704                 dbg("nonzero read bulk status received: %d", status);
 705                 mos7840_port->read_urb_busy = false;
 706                 return;
 707         }
 708
 709         port = (struct usb_serial_port *)mos7840_port->port;
 710         if (mos7840_port_paranoia_check(port, __func__)) {
 711                 dbg("%s", "Port Paranoia failed");
 712                 mos7840_port->read_urb_busy = false;
 713                 return;
 714         }
 715
 716         serial = mos7840_get_usb_serial(port, __func__);
 717         if (!serial) {
 718                 dbg("%s", "Bad serial pointer");
 719                 mos7840_port->read_urb_busy = false;
 720                 return;
 721         }
 722
 723         dbg("%s", "Entering... ");
 724
 725         data = urb->transfer_buffer;
 726
 727         dbg("%s", "Entering ...........");
 728
 729         if (urb->actual_length) {
 730                 tty = tty_port_tty_get(&mos7840_port->port->port);
 731                 if (tty) {
 732                         tty_buffer_request_room(tty, urb->actual_length);
 733                         tty_insert_flip_string(tty, data, urb->actual_length);
 734                         dbg(" %s ", data);
 735                         tty_flip_buffer_push(tty);
 736                         tty_kref_put(tty);
 737                 }
 738                 mos7840_port->icount.rx += urb->actual_length;
 739                 smp_wmb();
 740                 dbg("mos7840_port->icount.rx is %d:",
 741                     mos7840_port->icount.rx);
 742         }
 743
 744         if (!mos7840_port->read_urb) {
 745                 dbg("%s", "URB KILLED !!!");
 746                 mos7840_port->read_urb_busy = false;
 747                 return;
 748         }
 749
 750
 751         mos7840_port->read_urb->dev = serial->dev;
 752
 753         mos7840_port->read_urb_busy = true;
 754         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 755
 756         if (retval) {
 757                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 758                 mos7840_port->read_urb_busy = false;
 759         }
 760 }
 761
 762 /*****************************************************************************
 763  * mos7840_bulk_out_data_callback
 764  *      this is the callback function for when we have finished sending
 765  *      serial data on the bulk out endpoint.
 766  *****************************************************************************/
 767
 768 static void mos7840_bulk_out_data_callback(struct urb *urb)
 769 {
 770         struct moschip_port *mos7840_port;
 771         struct tty_struct *tty;
 772         int status = urb->status;
 773         int i;
 774
 775         mos7840_port = urb->context;
 776         spin_lock(&mos7840_port->pool_lock);
 777         for (i = 0; i < NUM_URBS; i++) {
 778                 if (urb == mos7840_port->write_urb_pool[i]) {
 779                         mos7840_port->busy[i] = 0;
 780                         break;
 781                 }
 782         }
 783         spin_unlock(&mos7840_port->pool_lock);
 784
 785         if (status) {
 786                 dbg("nonzero write bulk status received:%d", status);
 787                 return;
 788         }
 789
 790         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 791                 dbg("%s", "Port Paranoia failed");
 792                 return;
 793         }
 794
 795         dbg("%s", "Entering .........");
 796
 797         tty = tty_port_tty_get(&mos7840_port->port->port);
 798         if (tty && mos7840_port->open)
 799                 tty_wakeup(tty);
 800         tty_kref_put(tty);
 801
 802 }
 803
 804 /************************************************************************/
 805 /*       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       */
 806 /************************************************************************/
 807 #ifdef MCSSerialProbe
 808 static int mos7840_serial_probe(struct usb_serial *serial,
 809                                 const struct usb_device_id *id)
 810 {
 811
 812         /*need to implement the mode_reg reading and updating\
 813            structures usb_serial_ device_type\
 814            (i.e num_ports, num_bulkin,bulkout etc) */
 815         /* Also we can update the changes  attach */
 816         return 1;
 817 }
 818 #endif
 819
 820 /*****************************************************************************
 821  * mos7840_open
 822  *      this function is called by the tty driver when a port is opened
 823  *      If successful, we return 0
 824  *      Otherwise we return a negative error number.
 825  *****************************************************************************/
 826
 827 static int mos7840_open(struct tty_struct *tty,
 828                         struct usb_serial_port *port, struct file *filp)
 829 {
 830         int response;
 831         int j;
 832         struct usb_serial *serial;
 833         struct urb *urb;
 834         __u16 Data;
 835         int status;
 836         struct moschip_port *mos7840_port;
 837         struct moschip_port *port0;
 838
 839         dbg ("%s enter", __func__);
 840
 841         if (mos7840_port_paranoia_check(port, __func__)) {
 842                 dbg("%s", "Port Paranoia failed");
 843                 return -ENODEV;
 844         }
 845
 846         serial = port->serial;
 847
 848         if (mos7840_serial_paranoia_check(serial, __func__)) {
 849                 dbg("%s", "Serial Paranoia failed");
 850                 return -ENODEV;
 851         }
 852
 853         mos7840_port = mos7840_get_port_private(port);
 854         port0 = mos7840_get_port_private(serial->port[0]);
 855
 856         if (mos7840_port == NULL || port0 == NULL)
 857                 return -ENODEV;
 858
 859         usb_clear_halt(serial->dev, port->write_urb->pipe);
 860         usb_clear_halt(serial->dev, port->read_urb->pipe);
 861         port0->open_ports++;
 862
 863         /* Initialising the write urb pool */
 864         for (j = 0; j < NUM_URBS; ++j) {
 865                 urb = usb_alloc_urb(0, GFP_KERNEL);
 866                 mos7840_port->write_urb_pool[j] = urb;
 867
 868                 if (urb == NULL) {
 869                         dev_err(&port->dev, "No more urbs???\n");
 870                         continue;
 871                 }
 872
 873                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 874                                                                 GFP_KERNEL);
 875                 if (!urb->transfer_buffer) {
 876                         usb_free_urb(urb);
 877                         mos7840_port->write_urb_pool[j] = NULL;
 878                         dev_err(&port->dev,
 879                                 "%s-out of memory for urb buffers.\n",
 880                                 __func__);
 881                         continue;
 882                 }
 883         }
 884
 885 /*****************************************************************************
 886  * Initialize MCS7840 -- Write Init values to corresponding Registers
 887  *
 888  * Register Index
 889  * 1 : IER
 890  * 2 : FCR
 891  * 3 : LCR
 892  * 4 : MCR
 893  *
 894  * 0x08 : SP1/2 Control Reg
 895  *****************************************************************************/
 896
 897         /* NEED to check the following Block */
 898
 899         Data = 0x0;
 900         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 901         if (status < 0) {
 902                 dbg("Reading Spreg failed");
 903                 return -1;
 904         }
 905         Data |= 0x80;
 906         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 907         if (status < 0) {
 908                 dbg("writing Spreg failed");
 909                 return -1;
 910         }
 911
 912         Data &= ~0x80;
 913         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 914         if (status < 0) {
 915                 dbg("writing Spreg failed");
 916                 return -1;
 917         }
 918         /* End of block to be checked */
 919
 920         Data = 0x0;
 921         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 922                                                                         &Data);
 923         if (status < 0) {
 924                 dbg("Reading Controlreg failed");
 925                 return -1;
 926         }
 927         Data |= 0x08;           /* Driver done bit */
 928         Data |= 0x20;           /* rx_disable */
 929         status = mos7840_set_reg_sync(port,
 930                                 mos7840_port->ControlRegOffset, Data);
 931         if (status < 0) {
 932                 dbg("writing Controlreg failed");
 933                 return -1;
 934         }
 935         /* do register settings here */
 936         /* Set all regs to the device default values. */
 937         /***********************************
 938          * First Disable all interrupts.
 939          ***********************************/
 940         Data = 0x00;
 941         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 942         if (status < 0) {
 943                 dbg("disabling interrupts failed");
 944                 return -1;
 945         }
 946         /* Set FIFO_CONTROL_REGISTER to the default value */
 947         Data = 0x00;
 948         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 949         if (status < 0) {
 950                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 951                 return -1;
 952         }
 953
 954         Data = 0xcf;
 955         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 956         if (status < 0) {
 957                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 958                 return -1;
 959         }
 960
 961         Data = 0x03;
 962         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 963         mos7840_port->shadowLCR = Data;
 964
 965         Data = 0x0b;
 966         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 967         mos7840_port->shadowMCR = Data;
 968
 969         Data = 0x00;
 970         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 971         mos7840_port->shadowLCR = Data;
 972
 973         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 974         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 975
 976         Data = 0x0c;
 977         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 978
 979         Data = 0x0;
 980         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 981
 982         Data = 0x00;
 983         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 984
 985         Data = Data & ~SERIAL_LCR_DLAB;
 986         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 987         mos7840_port->shadowLCR = Data;
 988
 989         /* clearing Bulkin and Bulkout Fifo */
 990         Data = 0x0;
 991         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 992
 993         Data = Data | 0x0c;
 994         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 995
 996         Data = Data & ~0x0c;
 997         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 998         /* Finally enable all interrupts */
 999         Data = 0x0c;
1000         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1001
1002         /* clearing rx_disable */
1003         Data = 0x0;
1004         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1005                                                                         &Data);
1006         Data = Data & ~0x20;
1007         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1008                                                                         Data);
1009
1010         /* rx_negate */
1011         Data = 0x0;
1012         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1013                                                                         &Data);
1014         Data = Data | 0x10;
1015         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1016                                                                         Data);
1017
1018         /* Check to see if we've set up our endpoint info yet    *
1019          * (can't set it up in mos7840_startup as the structures *
1020          * were not set up at that time.)                        */
1021         if (port0->open_ports == 1) {
1022                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1023                         /* set up interrupt urb */
1024                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1025                                 serial->dev,
1026                                 usb_rcvintpipe(serial->dev,
1027                                 serial->port[0]->interrupt_in_endpointAddress),
1028                                 serial->port[0]->interrupt_in_buffer,
1029                                 serial->port[0]->interrupt_in_urb->
1030                                 transfer_buffer_length,
1031                                 mos7840_interrupt_callback,
1032                                 serial,
1033                                 serial->port[0]->interrupt_in_urb->interval);
1034
1035                         /* start interrupt read for mos7840               *
1036                          * will continue as long as mos7840 is connected  */
1037
1038                         response =
1039                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1040                                            GFP_KERNEL);
1041                         if (response) {
1042                                 dev_err(&port->dev, "%s - Error %d submitting "
1043                                         "interrupt urb\n", __func__, response);
1044                         }
1045
1046                 }
1047
1048         }
1049
1050         /* see if we've set up our endpoint info yet   *
1051          * (can't set it up in mos7840_startup as the  *
1052          * structures were not set up at that time.)   */
1053
1054         dbg("port number is %d", port->number);
1055         dbg("serial number is %d", port->serial->minor);
1056         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1057         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1058         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1059         dbg("port's number in the device is %d", mos7840_port->port_num);
1060         mos7840_port->read_urb = port->read_urb;
1061
1062         /* set up our bulk in urb */
1063
1064         usb_fill_bulk_urb(mos7840_port->read_urb,
1065                           serial->dev,
1066                           usb_rcvbulkpipe(serial->dev,
1067                                           port->bulk_in_endpointAddress),
1068                           port->bulk_in_buffer,
1069                           mos7840_port->read_urb->transfer_buffer_length,
1070                           mos7840_bulk_in_callback, mos7840_port);
1071
1072         dbg("mos7840_open: bulkin endpoint is %d",
1073             port->bulk_in_endpointAddress);
1074         mos7840_port->read_urb_busy = true;
1075         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1076         if (response) {
1077                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1078                         __func__, response);
1079                 mos7840_port->read_urb_busy = false;
1080         }
1081
1082         /* initialize our wait queues */
1083         init_waitqueue_head(&mos7840_port->wait_chase);
1084         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1085
1086         /* initialize our icount structure */
1087         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1088
1089         /* initialize our port settings */
1090         /* Must set to enable ints! */
1091         mos7840_port->shadowMCR = MCR_MASTER_IE;
1092         /* send a open port command */
1093         mos7840_port->open = 1;
1094         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1095         mos7840_port->icount.tx = 0;
1096         mos7840_port->icount.rx = 0;
1097
1098         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1099                                 serial, mos7840_port, port);
1100
1101         dbg ("%s leave", __func__);
1102
1103         return 0;
1104
1105 }
1106
1107 /*****************************************************************************
1108  * mos7840_chars_in_buffer
1109  *      this function is called by the tty driver when it wants to know how many
1110  *      bytes of data we currently have outstanding in the port (data that has
1111  *      been written, but hasn't made it out the port yet)
1112  *      If successful, we return the number of bytes left to be written in the
1113  *      system,
1114  *      Otherwise we return zero.
1115  *****************************************************************************/
1116
1117 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1118 {
1119         struct usb_serial_port *port = tty->driver_data;
1120         int i;
1121         int chars = 0;
1122         unsigned long flags;
1123         struct moschip_port *mos7840_port;
1124
1125         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1126
1127         if (mos7840_port_paranoia_check(port, __func__)) {
1128                 dbg("%s", "Invalid port");
1129                 return 0;
1130         }
1131
1132         mos7840_port = mos7840_get_port_private(port);
1133         if (mos7840_port == NULL) {
1134                 dbg("%s", "mos7840_break:leaving ...........");
1135                 return 0;
1136         }
1137
1138         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1139         for (i = 0; i < NUM_URBS; ++i)
1140                 if (mos7840_port->busy[i])
1141                         chars += URB_TRANSFER_BUFFER_SIZE;
1142         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1143         dbg("%s - returns %d", __func__, chars);
1144         return chars;
1145
1146 }
1147
1148 /*****************************************************************************
1149  * mos7840_close
1150  *      this function is called by the tty driver when a port is closed
1151  *****************************************************************************/
1152
1153 static void mos7840_close(struct usb_serial_port *port)
1154 {
1155         struct usb_serial *serial;
1156         struct moschip_port *mos7840_port;
1157         struct moschip_port *port0;
1158         int j;
1159         __u16 Data;
1160
1161         dbg("%s", "mos7840_close:entering...");
1162
1163         if (mos7840_port_paranoia_check(port, __func__)) {
1164                 dbg("%s", "Port Paranoia failed");
1165                 return;
1166         }
1167
1168         serial = mos7840_get_usb_serial(port, __func__);
1169         if (!serial) {
1170                 dbg("%s", "Serial Paranoia failed");
1171                 return;
1172         }
1173
1174         mos7840_port = mos7840_get_port_private(port);
1175         port0 = mos7840_get_port_private(serial->port[0]);
1176
1177         if (mos7840_port == NULL || port0 == NULL)
1178                 return;
1179
1180         for (j = 0; j < NUM_URBS; ++j)
1181                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1182
1183         /* Freeing Write URBs */
1184         for (j = 0; j < NUM_URBS; ++j) {
1185                 if (mos7840_port->write_urb_pool[j]) {
1186                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1187                                 kfree(mos7840_port->write_urb_pool[j]->
1188                                       transfer_buffer);
1189
1190                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1191                 }
1192         }
1193
1194         /* While closing port, shutdown all bulk read, write  *
1195          * and interrupt read if they exists                  */
1196         if (serial->dev) {
1197                 if (mos7840_port->write_urb) {
1198                         dbg("%s", "Shutdown bulk write");
1199                         usb_kill_urb(mos7840_port->write_urb);
1200                 }
1201                 if (mos7840_port->read_urb) {
1202                         dbg("%s", "Shutdown bulk read");
1203                         usb_kill_urb(mos7840_port->read_urb);
1204                         mos7840_port->read_urb_busy = false;
1205                 }
1206                 if ((&mos7840_port->control_urb)) {
1207                         dbg("%s", "Shutdown control read");
1208                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1209                 }
1210         }
1211 /*      if(mos7840_port->ctrl_buf != NULL) */
1212 /*              kfree(mos7840_port->ctrl_buf); */
1213         port0->open_ports--;
1214         dbg("mos7840_num_open_ports in close%d:in port%d",
1215             port0->open_ports, port->number);
1216         if (port0->open_ports == 0) {
1217                 if (serial->port[0]->interrupt_in_urb) {
1218                         dbg("%s", "Shutdown interrupt_in_urb");
1219                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1220                 }
1221         }
1222
1223         if (mos7840_port->write_urb) {
1224                 /* if this urb had a transfer buffer already (old tx) free it */
1225                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1226                         kfree(mos7840_port->write_urb->transfer_buffer);
1227                 usb_free_urb(mos7840_port->write_urb);
1228         }
1229
1230         Data = 0x0;
1231         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1232
1233         Data = 0x00;
1234         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1235
1236         mos7840_port->open = 0;
1237
1238         dbg("%s", "Leaving ............");
1239 }
1240
1241 /************************************************************************
1242  *
1243  * mos7840_block_until_chase_response
1244  *
1245  *      This function will block the close until one of the following:
1246  *              1. Response to our Chase comes from mos7840
1247  *              2. A timeout of 10 seconds without activity has expired
1248  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1249  *
1250  ************************************************************************/
1251
1252 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1253                                         struct moschip_port *mos7840_port)
1254 {
1255         int timeout = 1 * HZ;
1256         int wait = 10;
1257         int count;
1258
1259         while (1) {
1260                 count = mos7840_chars_in_buffer(tty);
1261
1262                 /* Check for Buffer status */
1263                 if (count <= 0)
1264                         return;
1265
1266                 /* Block the thread for a while */
1267                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1268                                                timeout);
1269                 /* No activity.. count down section */
1270                 wait--;
1271                 if (wait == 0) {
1272                         dbg("%s - TIMEOUT", __func__);
1273                         return;
1274                 } else {
1275                         /* Reset timeout value back to seconds */
1276                         wait = 10;
1277                 }
1278         }
1279
1280 }
1281
1282 /*****************************************************************************
1283  * mos7840_break
1284  *      this function sends a break to the port
1285  *****************************************************************************/
1286 static void mos7840_break(struct tty_struct *tty, int break_state)
1287 {
1288         struct usb_serial_port *port = tty->driver_data;
1289         unsigned char data;
1290         struct usb_serial *serial;
1291         struct moschip_port *mos7840_port;
1292
1293         dbg("%s", "Entering ...........");
1294         dbg("mos7840_break: Start");
1295
1296         if (mos7840_port_paranoia_check(port, __func__)) {
1297                 dbg("%s", "Port Paranoia failed");
1298                 return;
1299         }
1300
1301         serial = mos7840_get_usb_serial(port, __func__);
1302         if (!serial) {
1303                 dbg("%s", "Serial Paranoia failed");
1304                 return;
1305         }
1306
1307         mos7840_port = mos7840_get_port_private(port);
1308
1309         if (mos7840_port == NULL)
1310                 return;
1311
1312         if (serial->dev)
1313                 /* flush and block until tx is empty */
1314                 mos7840_block_until_chase_response(tty, mos7840_port);
1315
1316         if (break_state == -1)
1317                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1318         else
1319                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1320
1321         /* FIXME: no locking on shadowLCR anywhere in driver */
1322         mos7840_port->shadowLCR = data;
1323         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1324             mos7840_port->shadowLCR);
1325         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1326                              mos7840_port->shadowLCR);
1327
1328         return;
1329 }
1330
1331 /*****************************************************************************
1332  * mos7840_write_room
1333  *      this function is called by the tty driver when it wants to know how many
1334  *      bytes of data we can accept for a specific port.
1335  *      If successful, we return the amount of room that we have for this port
1336  *      Otherwise we return a negative error number.
1337  *****************************************************************************/
1338
1339 static int mos7840_write_room(struct tty_struct *tty)
1340 {
1341         struct usb_serial_port *port = tty->driver_data;
1342         int i;
1343         int room = 0;
1344         unsigned long flags;
1345         struct moschip_port *mos7840_port;
1346
1347         dbg("%s", " mos7840_write_room:entering ...........");
1348
1349         if (mos7840_port_paranoia_check(port, __func__)) {
1350                 dbg("%s", "Invalid port");
1351                 dbg("%s", " mos7840_write_room:leaving ...........");
1352                 return -1;
1353         }
1354
1355         mos7840_port = mos7840_get_port_private(port);
1356         if (mos7840_port == NULL) {
1357                 dbg("%s", "mos7840_break:leaving ...........");
1358                 return -1;
1359         }
1360
1361         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1362         for (i = 0; i < NUM_URBS; ++i) {
1363                 if (!mos7840_port->busy[i])
1364                         room += URB_TRANSFER_BUFFER_SIZE;
1365         }
1366         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1367
1368         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1369         dbg("%s - returns %d", __func__, room);
1370         return room;
1371
1372 }
1373
1374 /*****************************************************************************
1375  * mos7840_write
1376  *      this function is called by the tty driver when data should be written to
1377  *      the port.
1378  *      If successful, we return the number of bytes written, otherwise we
1379  *      return a negative error number.
1380  *****************************************************************************/
1381
1382 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1383                          const unsigned char *data, int count)
1384 {
1385         int status;
1386         int i;
1387         int bytes_sent = 0;
1388         int transfer_size;
1389         unsigned long flags;
1390
1391         struct moschip_port *mos7840_port;
1392         struct usb_serial *serial;
1393         struct urb *urb;
1394         /* __u16 Data; */
1395         const unsigned char *current_position = data;
1396         unsigned char *data1;
1397         dbg("%s", "entering ...........");
1398         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1399                                         mos7840_port->shadowLCR); */
1400
1401 #ifdef NOTMOS7840
1402         Data = 0x00;
1403         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1404         mos7840_port->shadowLCR = Data;
1405         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1406         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1407             mos7840_port->shadowLCR);
1408
1409         /* Data = 0x03; */
1410         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1411         /* mos7840_port->shadowLCR=Data;//Need to add later */
1412
1413         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1414         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1415
1416         /* Data = 0x0c; */
1417         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1418         Data = 0x00;
1419         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1420         dbg("mos7840_write:DLL value is %x", Data);
1421
1422         Data = 0x0;
1423         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1424         dbg("mos7840_write:DLM value is %x", Data);
1425
1426         Data = Data & ~SERIAL_LCR_DLAB;
1427         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1428             mos7840_port->shadowLCR);
1429         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1430 #endif
1431
1432         if (mos7840_port_paranoia_check(port, __func__)) {
1433                 dbg("%s", "Port Paranoia failed");
1434                 return -1;
1435         }
1436
1437         serial = port->serial;
1438         if (mos7840_serial_paranoia_check(serial, __func__)) {
1439                 dbg("%s", "Serial Paranoia failed");
1440                 return -1;
1441         }
1442
1443         mos7840_port = mos7840_get_port_private(port);
1444         if (mos7840_port == NULL) {
1445                 dbg("%s", "mos7840_port is NULL");
1446                 return -1;
1447         }
1448
1449         /* try to find a free urb in the list */
1450         urb = NULL;
1451
1452         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1453         for (i = 0; i < NUM_URBS; ++i) {
1454                 if (!mos7840_port->busy[i]) {
1455                         mos7840_port->busy[i] = 1;
1456                         urb = mos7840_port->write_urb_pool[i];
1457                         dbg("URB:%d", i);
1458                         break;
1459                 }
1460         }
1461         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1462
1463         if (urb == NULL) {
1464                 dbg("%s - no more free urbs", __func__);
1465                 goto exit;
1466         }
1467
1468         if (urb->transfer_buffer == NULL) {
1469                 urb->transfer_buffer =
1470                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1471
1472                 if (urb->transfer_buffer == NULL) {
1473                         dev_err(&port->dev, "%s no more kernel memory...\n",
1474                                 __func__);
1475                         goto exit;
1476                 }
1477         }
1478         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1479
1480         memcpy(urb->transfer_buffer, current_position, transfer_size);
1481
1482         /* fill urb with data and submit  */
1483         usb_fill_bulk_urb(urb,
1484                           serial->dev,
1485                           usb_sndbulkpipe(serial->dev,
1486                                           port->bulk_out_endpointAddress),
1487                           urb->transfer_buffer,
1488                           transfer_size,
1489                           mos7840_bulk_out_data_callback, mos7840_port);
1490
1491         data1 = urb->transfer_buffer;
1492         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1493
1494         /* send it down the pipe */
1495         status = usb_submit_urb(urb, GFP_ATOMIC);
1496
1497         if (status) {
1498                 mos7840_port->busy[i] = 0;
1499                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1500                         "with status = %d\n", __func__, status);
1501                 bytes_sent = status;
1502                 goto exit;
1503         }
1504         bytes_sent = transfer_size;
1505         mos7840_port->icount.tx += transfer_size;
1506         smp_wmb();
1507         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1508 exit:
1509         return bytes_sent;
1510
1511 }
1512
1513 /*****************************************************************************
1514  * mos7840_throttle
1515  *      this function is called by the tty driver when it wants to stop the data
1516  *      being read from the port.
1517  *****************************************************************************/
1518
1519 static void mos7840_throttle(struct tty_struct *tty)
1520 {
1521         struct usb_serial_port *port = tty->driver_data;
1522         struct moschip_port *mos7840_port;
1523         int status;
1524
1525         if (mos7840_port_paranoia_check(port, __func__)) {
1526                 dbg("%s", "Invalid port");
1527                 return;
1528         }
1529
1530         dbg("- port %d", port->number);
1531
1532         mos7840_port = mos7840_get_port_private(port);
1533
1534         if (mos7840_port == NULL)
1535                 return;
1536
1537         if (!mos7840_port->open) {
1538                 dbg("%s", "port not opened");
1539                 return;
1540         }
1541
1542         dbg("%s", "Entering ..........");
1543
1544         /* if we are implementing XON/XOFF, send the stop character */
1545         if (I_IXOFF(tty)) {
1546                 unsigned char stop_char = STOP_CHAR(tty);
1547                 status = mos7840_write(tty, port, &stop_char, 1);
1548                 if (status <= 0)
1549                         return;
1550         }
1551         /* if we are implementing RTS/CTS, toggle that line */
1552         if (tty->termios->c_cflag & CRTSCTS) {
1553                 mos7840_port->shadowMCR &= ~MCR_RTS;
1554                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1555                                          mos7840_port->shadowMCR);
1556                 if (status < 0)
1557                         return;
1558         }
1559
1560         return;
1561 }
1562
1563 /*****************************************************************************
1564  * mos7840_unthrottle
1565  *      this function is called by the tty driver when it wants to resume
1566  *      the data being read from the port (called after mos7840_throttle is
1567  *      called)
1568  *****************************************************************************/
1569 static void mos7840_unthrottle(struct tty_struct *tty)
1570 {
1571         struct usb_serial_port *port = tty->driver_data;
1572         int status;
1573         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1574
1575         if (mos7840_port_paranoia_check(port, __func__)) {
1576                 dbg("%s", "Invalid port");
1577                 return;
1578         }
1579
1580         if (mos7840_port == NULL)
1581                 return;
1582
1583         if (!mos7840_port->open) {
1584                 dbg("%s - port not opened", __func__);
1585                 return;
1586         }
1587
1588         dbg("%s", "Entering ..........");
1589
1590         /* if we are implementing XON/XOFF, send the start character */
1591         if (I_IXOFF(tty)) {
1592                 unsigned char start_char = START_CHAR(tty);
1593                 status = mos7840_write(tty, port, &start_char, 1);
1594                 if (status <= 0)
1595                         return;
1596         }
1597
1598         /* if we are implementing RTS/CTS, toggle that line */
1599         if (tty->termios->c_cflag & CRTSCTS) {
1600                 mos7840_port->shadowMCR |= MCR_RTS;
1601                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1602                                          mos7840_port->shadowMCR);
1603                 if (status < 0)
1604                         return;
1605         }
1606 }
1607
1608 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1609 {
1610         struct usb_serial_port *port = tty->driver_data;
1611         struct moschip_port *mos7840_port;
1612         unsigned int result;
1613         __u16 msr;
1614         __u16 mcr;
1615         int status;
1616         mos7840_port = mos7840_get_port_private(port);
1617
1618         dbg("%s - port %d", __func__, port->number);
1619
1620         if (mos7840_port == NULL)
1621                 return -ENODEV;
1622
1623         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1624         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1625         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1626             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1627             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1628             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1629             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1630             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1631             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1632
1633         dbg("%s - 0x%04X", __func__, result);
1634
1635         return result;
1636 }
1637
1638 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1639                             unsigned int set, unsigned int clear)
1640 {
1641         struct usb_serial_port *port = tty->driver_data;
1642         struct moschip_port *mos7840_port;
1643         unsigned int mcr;
1644         int status;
1645
1646         dbg("%s - port %d", __func__, port->number);
1647
1648         mos7840_port = mos7840_get_port_private(port);
1649
1650         if (mos7840_port == NULL)
1651                 return -ENODEV;
1652
1653         /* FIXME: What locks the port registers ? */
1654         mcr = mos7840_port->shadowMCR;
1655         if (clear & TIOCM_RTS)
1656                 mcr &= ~MCR_RTS;
1657         if (clear & TIOCM_DTR)
1658                 mcr &= ~MCR_DTR;
1659         if (clear & TIOCM_LOOP)
1660                 mcr &= ~MCR_LOOPBACK;
1661
1662         if (set & TIOCM_RTS)
1663                 mcr |= MCR_RTS;
1664         if (set & TIOCM_DTR)
1665                 mcr |= MCR_DTR;
1666         if (set & TIOCM_LOOP)
1667                 mcr |= MCR_LOOPBACK;
1668
1669         mos7840_port->shadowMCR = mcr;
1670
1671         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1672         if (status < 0) {
1673                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1674                 return status;
1675         }
1676
1677         return 0;
1678 }
1679
1680 /*****************************************************************************
1681  * mos7840_calc_baud_rate_divisor
1682  *      this function calculates the proper baud rate divisor for the specified
1683  *      baud rate.
1684  *****************************************************************************/
1685 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1686                                           __u16 *clk_sel_val)
1687 {
1688
1689         dbg("%s - %d", __func__, baudRate);
1690
1691         if (baudRate <= 115200) {
1692                 *divisor = 115200 / baudRate;
1693                 *clk_sel_val = 0x0;
1694         }
1695         if ((baudRate > 115200) && (baudRate <= 230400)) {
1696                 *divisor = 230400 / baudRate;
1697                 *clk_sel_val = 0x10;
1698         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1699                 *divisor = 403200 / baudRate;
1700                 *clk_sel_val = 0x20;
1701         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1702                 *divisor = 460800 / baudRate;
1703                 *clk_sel_val = 0x30;
1704         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1705                 *divisor = 806400 / baudRate;
1706                 *clk_sel_val = 0x40;
1707         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1708                 *divisor = 921600 / baudRate;
1709                 *clk_sel_val = 0x50;
1710         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1711                 *divisor = 1572864 / baudRate;
1712                 *clk_sel_val = 0x60;
1713         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1714                 *divisor = 3145728 / baudRate;
1715                 *clk_sel_val = 0x70;
1716         }
1717         return 0;
1718
1719 #ifdef NOTMCS7840
1720
1721         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1722                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1723                         *divisor = mos7840_divisor_table[i].Divisor;
1724                         return 0;
1725                 }
1726         }
1727
1728         /* After trying for all the standard baud rates    *
1729          * Try calculating the divisor for this baud rate  */
1730
1731         if (baudrate > 75 && baudrate < 230400) {
1732                 /* get the divisor */
1733                 custom = (__u16) (230400L / baudrate);
1734
1735                 /* Check for round off */
1736                 round1 = (__u16) (2304000L / baudrate);
1737                 round = (__u16) (round1 - (custom * 10));
1738                 if (round > 4)
1739                         custom++;
1740                 *divisor = custom;
1741
1742                 dbg(" Baud %d = %d", baudrate, custom);
1743                 return 0;
1744         }
1745
1746         dbg("%s", " Baud calculation Failed...");
1747         return -1;
1748 #endif
1749 }
1750
1751 /*****************************************************************************
1752  * mos7840_send_cmd_write_baud_rate
1753  *      this function sends the proper command to change the baud rate of the
1754  *      specified port.
1755  *****************************************************************************/
1756
1757 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1758                                             int baudRate)
1759 {
1760         int divisor = 0;
1761         int status;
1762         __u16 Data;
1763         unsigned char number;
1764         __u16 clk_sel_val;
1765         struct usb_serial_port *port;
1766
1767         if (mos7840_port == NULL)
1768                 return -1;
1769
1770         port = (struct usb_serial_port *)mos7840_port->port;
1771         if (mos7840_port_paranoia_check(port, __func__)) {
1772                 dbg("%s", "Invalid port");
1773                 return -1;
1774         }
1775
1776         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1777                 dbg("%s", "Invalid Serial");
1778                 return -1;
1779         }
1780
1781         dbg("%s", "Entering ..........");
1782
1783         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1784
1785         dbg("%s - port = %d, baud = %d", __func__,
1786             mos7840_port->port->number, baudRate);
1787         /* reset clk_uart_sel in spregOffset */
1788         if (baudRate > 115200) {
1789 #ifdef HW_flow_control
1790                 /* NOTE: need to see the pther register to modify */
1791                 /* setting h/w flow control bit to 1 */
1792                 Data = 0x2b;
1793                 mos7840_port->shadowMCR = Data;
1794                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1795                                                                         Data);
1796                 if (status < 0) {
1797                         dbg("Writing spreg failed in set_serial_baud");
1798                         return -1;
1799                 }
1800 #endif
1801
1802         } else {
1803 #ifdef HW_flow_control
1804                 / *setting h/w flow control bit to 0 */
1805                 Data = 0xb;
1806                 mos7840_port->shadowMCR = Data;
1807                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1808                                                                         Data);
1809                 if (status < 0) {
1810                         dbg("Writing spreg failed in set_serial_baud");
1811                         return -1;
1812                 }
1813 #endif
1814
1815         }
1816
1817         if (1) {                /* baudRate <= 115200) */
1818                 clk_sel_val = 0x0;
1819                 Data = 0x0;
1820                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1821                                                    &clk_sel_val);
1822                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1823                                                                  &Data);
1824                 if (status < 0) {
1825                         dbg("reading spreg failed in set_serial_baud");
1826                         return -1;
1827                 }
1828                 Data = (Data & 0x8f) | clk_sel_val;
1829                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1830                                                                 Data);
1831                 if (status < 0) {
1832                         dbg("Writing spreg failed in set_serial_baud");
1833                         return -1;
1834                 }
1835                 /* Calculate the Divisor */
1836
1837                 if (status) {
1838                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1839                         return status;
1840                 }
1841                 /* Enable access to divisor latch */
1842                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1843                 mos7840_port->shadowLCR = Data;
1844                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1845
1846                 /* Write the divisor */
1847                 Data = (unsigned char)(divisor & 0xff);
1848                 dbg("set_serial_baud Value to write DLL is %x", Data);
1849                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1850
1851                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1852                 dbg("set_serial_baud Value to write DLM is %x", Data);
1853                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1854
1855                 /* Disable access to divisor latch */
1856                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1857                 mos7840_port->shadowLCR = Data;
1858                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1859
1860         }
1861         return status;
1862 }
1863
1864 /*****************************************************************************
1865  * mos7840_change_port_settings
1866  *      This routine is called to set the UART on the device to match
1867  *      the specified new settings.
1868  *****************************************************************************/
1869
1870 static void mos7840_change_port_settings(struct tty_struct *tty,
1871         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1872 {
1873         int baud;
1874         unsigned cflag;
1875         unsigned iflag;
1876         __u8 lData;
1877         __u8 lParity;
1878         __u8 lStop;
1879         int status;
1880         __u16 Data;
1881         struct usb_serial_port *port;
1882         struct usb_serial *serial;
1883
1884         if (mos7840_port == NULL)
1885                 return;
1886
1887         port = (struct usb_serial_port *)mos7840_port->port;
1888
1889         if (mos7840_port_paranoia_check(port, __func__)) {
1890                 dbg("%s", "Invalid port");
1891                 return;
1892         }
1893
1894         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1895                 dbg("%s", "Invalid Serial");
1896                 return;
1897         }
1898
1899         serial = port->serial;
1900
1901         dbg("%s - port %d", __func__, mos7840_port->port->number);
1902
1903         if (!mos7840_port->open) {
1904                 dbg("%s - port not opened", __func__);
1905                 return;
1906         }
1907
1908         dbg("%s", "Entering ..........");
1909
1910         lData = LCR_BITS_8;
1911         lStop = LCR_STOP_1;
1912         lParity = LCR_PAR_NONE;
1913
1914         cflag = tty->termios->c_cflag;
1915         iflag = tty->termios->c_iflag;
1916
1917         /* Change the number of bits */
1918         if (cflag & CSIZE) {
1919                 switch (cflag & CSIZE) {
1920                 case CS5:
1921                         lData = LCR_BITS_5;
1922                         break;
1923
1924                 case CS6:
1925                         lData = LCR_BITS_6;
1926                         break;
1927
1928                 case CS7:
1929                         lData = LCR_BITS_7;
1930                         break;
1931                 default:
1932                 case CS8:
1933                         lData = LCR_BITS_8;
1934                         break;
1935                 }
1936         }
1937         /* Change the Parity bit */
1938         if (cflag & PARENB) {
1939                 if (cflag & PARODD) {
1940                         lParity = LCR_PAR_ODD;
1941                         dbg("%s - parity = odd", __func__);
1942                 } else {
1943                         lParity = LCR_PAR_EVEN;
1944                         dbg("%s - parity = even", __func__);
1945                 }
1946
1947         } else {
1948                 dbg("%s - parity = none", __func__);
1949         }
1950
1951         if (cflag & CMSPAR)
1952                 lParity = lParity | 0x20;
1953
1954         /* Change the Stop bit */
1955         if (cflag & CSTOPB) {
1956                 lStop = LCR_STOP_2;
1957                 dbg("%s - stop bits = 2", __func__);
1958         } else {
1959                 lStop = LCR_STOP_1;
1960                 dbg("%s - stop bits = 1", __func__);
1961         }
1962
1963         /* Update the LCR with the correct value */
1964         mos7840_port->shadowLCR &=
1965             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1966         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1967
1968         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
1969             mos7840_port->shadowLCR);
1970         /* Disable Interrupts */
1971         Data = 0x00;
1972         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1973
1974         Data = 0x00;
1975         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1976
1977         Data = 0xcf;
1978         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1979
1980         /* Send the updated LCR value to the mos7840 */
1981         Data = mos7840_port->shadowLCR;
1982
1983         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1984
1985         Data = 0x00b;
1986         mos7840_port->shadowMCR = Data;
1987         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1988         Data = 0x00b;
1989         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1990
1991         /* set up the MCR register and send it to the mos7840 */
1992
1993         mos7840_port->shadowMCR = MCR_MASTER_IE;
1994         if (cflag & CBAUD)
1995                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1996
1997         if (cflag & CRTSCTS)
1998                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1999         else
2000                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2001
2002         Data = mos7840_port->shadowMCR;
2003         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2004
2005         /* Determine divisor based on baud rate */
2006         baud = tty_get_baud_rate(tty);
2007
2008         if (!baud) {
2009                 /* pick a default, any default... */
2010                 dbg("%s", "Picked default baud...");
2011                 baud = 9600;
2012         }
2013
2014         dbg("%s - baud rate = %d", __func__, baud);
2015         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2016
2017         /* Enable Interrupts */
2018         Data = 0x0c;
2019         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2020
2021         if (mos7840_port->read_urb_busy == false) {
2022                 mos7840_port->read_urb->dev = serial->dev;
2023                 mos7840_port->read_urb_busy = true;
2024                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2025                 if (status) {
2026                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2027                             status);
2028                         mos7840_port->read_urb_busy = false;
2029                 }
2030         }
2031         wake_up(&mos7840_port->delta_msr_wait);
2032         mos7840_port->delta_msr_cond = 1;
2033         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2034             mos7840_port->shadowLCR);
2035
2036         return;
2037 }
2038
2039 /*****************************************************************************
2040  * mos7840_set_termios
2041  *      this function is called by the tty driver when it wants to change
2042  *      the termios structure
2043  *****************************************************************************/
2044
2045 static void mos7840_set_termios(struct tty_struct *tty,
2046                                 struct usb_serial_port *port,
2047                                 struct ktermios *old_termios)
2048 {
2049         int status;
2050         unsigned int cflag;
2051         struct usb_serial *serial;
2052         struct moschip_port *mos7840_port;
2053         dbg("mos7840_set_termios: START");
2054         if (mos7840_port_paranoia_check(port, __func__)) {
2055                 dbg("%s", "Invalid port");
2056                 return;
2057         }
2058
2059         serial = port->serial;
2060
2061         if (mos7840_serial_paranoia_check(serial, __func__)) {
2062                 dbg("%s", "Invalid Serial");
2063                 return;
2064         }
2065
2066         mos7840_port = mos7840_get_port_private(port);
2067
2068         if (mos7840_port == NULL)
2069                 return;
2070
2071         if (!mos7840_port->open) {
2072                 dbg("%s - port not opened", __func__);
2073                 return;
2074         }
2075
2076         dbg("%s", "setting termios - ");
2077
2078         cflag = tty->termios->c_cflag;
2079
2080         dbg("%s - clfag %08x iflag %08x", __func__,
2081             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2082         dbg("%s - old clfag %08x old iflag %08x", __func__,
2083             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2084         dbg("%s - port %d", __func__, port->number);
2085
2086         /* change the port settings to the new ones specified */
2087
2088         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2089
2090         if (!mos7840_port->read_urb) {
2091                 dbg("%s", "URB KILLED !!!!!");
2092                 return;
2093         }
2094
2095         if (mos7840_port->read_urb_busy == false) {
2096                 mos7840_port->read_urb->dev = serial->dev;
2097                 mos7840_port->read_urb_busy = true;
2098                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2099                 if (status) {
2100                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2101                             status);
2102                         mos7840_port->read_urb_busy = false;
2103                 }
2104         }
2105         return;
2106 }
2107
2108 /*****************************************************************************
2109  * mos7840_get_lsr_info - get line status register info
2110  *
2111  * Purpose: Let user call ioctl() to get info when the UART physically
2112  *          is emptied.  On bus types like RS485, the transmitter must
2113  *          release the bus after transmitting. This must be done when
2114  *          the transmit shift register is empty, not be done when the
2115  *          transmit holding register is empty.  This functionality
2116  *          allows an RS485 driver to be written in user space.
2117  *****************************************************************************/
2118
2119 static int mos7840_get_lsr_info(struct tty_struct *tty,
2120                                 unsigned int __user *value)
2121 {
2122         int count;
2123         unsigned int result = 0;
2124
2125         count = mos7840_chars_in_buffer(tty);
2126         if (count == 0) {
2127                 dbg("%s -- Empty", __func__);
2128                 result = TIOCSER_TEMT;
2129         }
2130
2131         if (copy_to_user(value, &result, sizeof(int)))
2132                 return -EFAULT;
2133         return 0;
2134 }
2135
2136 /*****************************************************************************
2137  * mos7840_set_modem_info
2138  *      function to set modem info
2139  *****************************************************************************/
2140
2141 /* FIXME: Should be using the model control hooks */
2142
2143 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2144                                   unsigned int cmd, unsigned int __user *value)
2145 {
2146         unsigned int mcr;
2147         unsigned int arg;
2148         __u16 Data;
2149         int status;
2150         struct usb_serial_port *port;
2151
2152         if (mos7840_port == NULL)
2153                 return -1;
2154
2155         port = (struct usb_serial_port *)mos7840_port->port;
2156         if (mos7840_port_paranoia_check(port, __func__)) {
2157                 dbg("%s", "Invalid port");
2158                 return -1;
2159         }
2160
2161         mcr = mos7840_port->shadowMCR;
2162
2163         if (copy_from_user(&arg, value, sizeof(int)))
2164                 return -EFAULT;
2165
2166         switch (cmd) {
2167         case TIOCMBIS:
2168                 if (arg & TIOCM_RTS)
2169                         mcr |= MCR_RTS;
2170                 if (arg & TIOCM_DTR)
2171                         mcr |= MCR_RTS;
2172                 if (arg & TIOCM_LOOP)
2173                         mcr |= MCR_LOOPBACK;
2174                 break;
2175
2176         case TIOCMBIC:
2177                 if (arg & TIOCM_RTS)
2178                         mcr &= ~MCR_RTS;
2179                 if (arg & TIOCM_DTR)
2180                         mcr &= ~MCR_RTS;
2181                 if (arg & TIOCM_LOOP)
2182                         mcr &= ~MCR_LOOPBACK;
2183                 break;
2184
2185         case TIOCMSET:
2186                 /* turn off the RTS and DTR and LOOPBACK
2187                  * and then only turn on what was asked to */
2188                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2189                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2190                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2191                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2192                 break;
2193         }
2194
2195         lock_kernel();
2196         mos7840_port->shadowMCR = mcr;
2197
2198         Data = mos7840_port->shadowMCR;
2199         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2200         unlock_kernel();
2201         if (status < 0) {
2202                 dbg("setting MODEM_CONTROL_REGISTER Failed");
2203                 return -1;
2204         }
2205
2206         return 0;
2207 }
2208
2209 /*****************************************************************************
2210  * mos7840_get_modem_info
2211  *      function to get modem info
2212  *****************************************************************************/
2213
2214 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2215                                   unsigned int __user *value)
2216 {
2217         unsigned int result = 0;
2218         __u16 msr;
2219         unsigned int mcr = mos7840_port->shadowMCR;
2220         mos7840_get_uart_reg(mos7840_port->port,
2221                                                 MODEM_STATUS_REGISTER, &msr);
2222         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2223             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2224             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2225             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2226             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2227             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2228
2229         dbg("%s -- %x", __func__, result);
2230
2231         if (copy_to_user(value, &result, sizeof(int)))
2232                 return -EFAULT;
2233         return 0;
2234 }
2235
2236 /*****************************************************************************
2237  * mos7840_get_serial_info
2238  *      function to get information about serial port
2239  *****************************************************************************/
2240
2241 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2242                                    struct serial_struct __user *retinfo)
2243 {
2244         struct serial_struct tmp;
2245
2246         if (mos7840_port == NULL)
2247                 return -1;
2248
2249         if (!retinfo)
2250                 return -EFAULT;
2251
2252         memset(&tmp, 0, sizeof(tmp));
2253
2254         tmp.type = PORT_16550A;
2255         tmp.line = mos7840_port->port->serial->minor;
2256         tmp.port = mos7840_port->port->number;
2257         tmp.irq = 0;
2258         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2259         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2260         tmp.baud_base = 9600;
2261         tmp.close_delay = 5 * HZ;
2262         tmp.closing_wait = 30 * HZ;
2263
2264         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2265                 return -EFAULT;
2266         return 0;
2267 }
2268
2269 /*****************************************************************************
2270  * SerialIoctl
2271  *      this function handles any ioctl calls to the driver
2272  *****************************************************************************/
2273
2274 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2275                          unsigned int cmd, unsigned long arg)
2276 {
2277         struct usb_serial_port *port = tty->driver_data;
2278         void __user *argp = (void __user *)arg;
2279         struct moschip_port *mos7840_port;
2280
2281         struct async_icount cnow;
2282         struct async_icount cprev;
2283         struct serial_icounter_struct icount;
2284         int mosret = 0;
2285
2286         if (mos7840_port_paranoia_check(port, __func__)) {
2287                 dbg("%s", "Invalid port");
2288                 return -1;
2289         }
2290
2291         mos7840_port = mos7840_get_port_private(port);
2292
2293         if (mos7840_port == NULL)
2294                 return -1;
2295
2296         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2297
2298         switch (cmd) {
2299                 /* return number of bytes available */
2300
2301         case TIOCSERGETLSR:
2302                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2303                 return mos7840_get_lsr_info(tty, argp);
2304                 return 0;
2305
2306         /* FIXME: use the modem hooks and remove this */
2307         case TIOCMBIS:
2308         case TIOCMBIC:
2309         case TIOCMSET:
2310                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2311                     port->number);
2312                 mosret =
2313                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2314                 return mosret;
2315
2316         case TIOCMGET:
2317                 dbg("%s (%d) TIOCMGET", __func__, port->number);
2318                 return mos7840_get_modem_info(mos7840_port, argp);
2319
2320         case TIOCGSERIAL:
2321                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2322                 return mos7840_get_serial_info(mos7840_port, argp);
2323
2324         case TIOCSSERIAL:
2325                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2326                 break;
2327
2328         case TIOCMIWAIT:
2329                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2330                 cprev = mos7840_port->icount;
2331                 while (1) {
2332                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2333                         mos7840_port->delta_msr_cond = 0;
2334                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2335                                                  (mos7840_port->
2336                                                   delta_msr_cond == 1));
2337
2338                         /* see if a signal did it */
2339                         if (signal_pending(current))
2340                                 return -ERESTARTSYS;
2341                         cnow = mos7840_port->icount;
2342                         smp_rmb();
2343                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2344                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2345                                 return -EIO;    /* no change => error */
2346                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2347                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2348                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2349                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2350                                 return 0;
2351                         }
2352                         cprev = cnow;
2353                 }
2354                 /* NOTREACHED */
2355                 break;
2356
2357         case TIOCGICOUNT:
2358                 cnow = mos7840_port->icount;
2359                 smp_rmb();
2360                 icount.cts = cnow.cts;
2361                 icount.dsr = cnow.dsr;
2362                 icount.rng = cnow.rng;
2363                 icount.dcd = cnow.dcd;
2364                 icount.rx = cnow.rx;
2365                 icount.tx = cnow.tx;
2366                 icount.frame = cnow.frame;
2367                 icount.overrun = cnow.overrun;
2368                 icount.parity = cnow.parity;
2369                 icount.brk = cnow.brk;
2370                 icount.buf_overrun = cnow.buf_overrun;
2371
2372                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2373                     port->number, icount.rx, icount.tx);
2374                 if (copy_to_user(argp, &icount, sizeof(icount)))
2375                         return -EFAULT;
2376                 return 0;
2377         default:
2378                 break;
2379         }
2380         return -ENOIOCTLCMD;
2381 }
2382
2383 static int mos7840_calc_num_ports(struct usb_serial *serial)
2384 {
2385         int mos7840_num_ports = 0;
2386
2387         dbg("numberofendpoints: cur %d, alt %d",
2388             (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2389             (int)serial->interface->altsetting->desc.bNumEndpoints);
2390         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2391                 mos7840_num_ports = serial->num_ports = 2;
2392         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2393                 serial->num_bulk_in = 4;
2394                 serial->num_bulk_out = 4;
2395                 mos7840_num_ports = serial->num_ports = 4;
2396         }
2397         dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2398         return mos7840_num_ports;
2399 }
2400
2401 /****************************************************************************
2402  * mos7840_startup
2403  ****************************************************************************/
2404
2405 static int mos7840_startup(struct usb_serial *serial)
2406 {
2407         struct moschip_port *mos7840_port;
2408         struct usb_device *dev;
2409         int i, status;
2410
2411         __u16 Data;
2412         dbg("%s", "mos7840_startup :Entering..........");
2413
2414         if (!serial) {
2415                 dbg("%s", "Invalid Handler");
2416                 return -1;
2417         }
2418
2419         dev = serial->dev;
2420
2421         dbg("%s", "Entering...");
2422         dbg ("mos7840_startup: serial = %p", serial);
2423
2424         /* we set up the pointers to the endpoints in the mos7840_open *
2425          * function, as the structures aren't created yet.             */
2426
2427         /* set up port private structures */
2428         for (i = 0; i < serial->num_ports; ++i) {
2429                 dbg ("mos7840_startup: configuring port %d............", i);
2430                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2431                 if (mos7840_port == NULL) {
2432                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2433                         status = -ENOMEM;
2434                         i--; /* don't follow NULL pointer cleaning up */
2435                         goto error;
2436                 }
2437
2438                 /* Initialize all port interrupt end point to port 0 int
2439                  * endpoint. Our device has only one interrupt end point
2440                  * common to all port */
2441
2442                 mos7840_port->port = serial->port[i];
2443                 mos7840_set_port_private(serial->port[i], mos7840_port);
2444                 spin_lock_init(&mos7840_port->pool_lock);
2445
2446                 /* minor is not initialised until later by
2447                  * usb-serial.c:get_free_serial() and cannot therefore be used
2448                  * to index device instances */
2449                 mos7840_port->port_num = i + 1;
2450                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2451                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2452                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2453                 dbg ("serial->minor = %d", serial->minor);
2454
2455                 if (mos7840_port->port_num == 1) {
2456                         mos7840_port->SpRegOffset = 0x0;
2457                         mos7840_port->ControlRegOffset = 0x1;
2458                         mos7840_port->DcrRegOffset = 0x4;
2459                 } else if ((mos7840_port->port_num == 2)
2460                            && (serial->num_ports == 4)) {
2461                         mos7840_port->SpRegOffset = 0x8;
2462                         mos7840_port->ControlRegOffset = 0x9;
2463                         mos7840_port->DcrRegOffset = 0x16;
2464                 } else if ((mos7840_port->port_num == 2)
2465                            && (serial->num_ports == 2)) {
2466                         mos7840_port->SpRegOffset = 0xa;
2467                         mos7840_port->ControlRegOffset = 0xb;
2468                         mos7840_port->DcrRegOffset = 0x19;
2469                 } else if ((mos7840_port->port_num == 3)
2470                            && (serial->num_ports == 4)) {
2471                         mos7840_port->SpRegOffset = 0xa;
2472                         mos7840_port->ControlRegOffset = 0xb;
2473                         mos7840_port->DcrRegOffset = 0x19;
2474                 } else if ((mos7840_port->port_num == 4)
2475                            && (serial->num_ports == 4)) {
2476                         mos7840_port->SpRegOffset = 0xc;
2477                         mos7840_port->ControlRegOffset = 0xd;
2478                         mos7840_port->DcrRegOffset = 0x1c;
2479                 }
2480                 mos7840_dump_serial_port(mos7840_port);
2481                 mos7840_set_port_private(serial->port[i], mos7840_port);
2482
2483                 /* enable rx_disable bit in control register */
2484                 status = mos7840_get_reg_sync(serial->port[i],
2485                                  mos7840_port->ControlRegOffset, &Data);
2486                 if (status < 0) {
2487                         dbg("Reading ControlReg failed status-0x%x", status);
2488                         break;
2489                 } else
2490                         dbg("ControlReg Reading success val is %x, status%d",
2491                             Data, status);
2492                 Data |= 0x08;   /* setting driver done bit */
2493                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2494                                    modem status reg */
2495
2496                 /* Data |= 0x20; //rx_disable bit */
2497                 status = mos7840_set_reg_sync(serial->port[i],
2498                                          mos7840_port->ControlRegOffset, Data);
2499                 if (status < 0) {
2500                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2501                         break;
2502                 } else
2503                         dbg("ControlReg Writing success(rx_disable) status%d",
2504                             status);
2505
2506                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2507                    and 0x24 in DCR3 */
2508                 Data = 0x01;
2509                 status = mos7840_set_reg_sync(serial->port[i],
2510                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2511                 if (status < 0) {
2512                         dbg("Writing DCR0 failed status-0x%x", status);
2513                         break;
2514                 } else
2515                         dbg("DCR0 Writing success status%d", status);
2516
2517                 Data = 0x05;
2518                 status = mos7840_set_reg_sync(serial->port[i],
2519                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2520                 if (status < 0) {
2521                         dbg("Writing DCR1 failed status-0x%x", status);
2522                         break;
2523                 } else
2524                         dbg("DCR1 Writing success status%d", status);
2525
2526                 Data = 0x24;
2527                 status = mos7840_set_reg_sync(serial->port[i],
2528                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2529                 if (status < 0) {
2530                         dbg("Writing DCR2 failed status-0x%x", status);
2531                         break;
2532                 } else
2533                         dbg("DCR2 Writing success status%d", status);
2534
2535                 /* write values in clkstart0x0 and clkmulti 0x20 */
2536                 Data = 0x0;
2537                 status = mos7840_set_reg_sync(serial->port[i],
2538                                          CLK_START_VALUE_REGISTER, Data);
2539                 if (status < 0) {
2540                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2541                         break;
2542                 } else
2543                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2544
2545                 Data = 0x20;
2546                 status = mos7840_set_reg_sync(serial->port[i],
2547                                         CLK_MULTI_REGISTER, Data);
2548                 if (status < 0) {
2549                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2550                             status);
2551                         goto error;
2552                 } else
2553                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2554                             status);
2555
2556                 /* write value 0x0 to scratchpad register */
2557                 Data = 0x00;
2558                 status = mos7840_set_uart_reg(serial->port[i],
2559                                                 SCRATCH_PAD_REGISTER, Data);
2560                 if (status < 0) {
2561                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2562                             status);
2563                         break;
2564                 } else
2565                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2566                             status);
2567
2568                 /* Zero Length flag register */
2569                 if ((mos7840_port->port_num != 1)
2570                     && (serial->num_ports == 2)) {
2571
2572                         Data = 0xff;
2573                         status = mos7840_set_reg_sync(serial->port[i],
2574                                       (__u16) (ZLP_REG1 +
2575                                       ((__u16)mos7840_port->port_num)), Data);
2576                         dbg("ZLIP offset %x",
2577                             (__u16) (ZLP_REG1 +
2578                                         ((__u16) mos7840_port->port_num)));
2579                         if (status < 0) {
2580                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2581                                     i + 2, status);
2582                                 break;
2583                         } else
2584                                 dbg("ZLP_REG%d Writing success status%d",
2585                                     i + 2, status);
2586                 } else {
2587                         Data = 0xff;
2588                         status = mos7840_set_reg_sync(serial->port[i],
2589                               (__u16) (ZLP_REG1 +
2590                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2591                         dbg("ZLIP offset %x",
2592                             (__u16) (ZLP_REG1 +
2593                                      ((__u16) mos7840_port->port_num) - 0x1));
2594                         if (status < 0) {
2595                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2596                                     i + 1, status);
2597                                 break;
2598                         } else
2599                                 dbg("ZLP_REG%d Writing success status%d",
2600                                     i + 1, status);
2601
2602                 }
2603                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2604                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2605                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2606                                                                 GFP_KERNEL);
2607                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2608                                                         !mos7840_port->dr) {
2609                         status = -ENOMEM;
2610                         goto error;
2611                 }
2612         }
2613         dbg ("mos7840_startup: all ports configured...........");
2614
2615         /* Zero Length flag enable */
2616         Data = 0x0f;
2617         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2618         if (status < 0) {
2619                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2620                 goto error;
2621         } else
2622                 dbg("ZLP_REG5 Writing success status%d", status);
2623
2624         /* setting configuration feature to one */
2625         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2626                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2627         return 0;
2628 error:
2629         for (/* nothing */; i >= 0; i--) {
2630                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2631
2632                 kfree(mos7840_port->dr);
2633                 kfree(mos7840_port->ctrl_buf);
2634                 usb_free_urb(mos7840_port->control_urb);
2635                 kfree(mos7840_port);
2636                 serial->port[i] = NULL;
2637         }
2638         return status;
2639 }
2640
2641 /****************************************************************************
2642  * mos7840_disconnect
2643  *      This function is called whenever the device is removed from the usb bus.
2644  ****************************************************************************/
2645
2646 static void mos7840_disconnect(struct usb_serial *serial)
2647 {
2648         int i;
2649         unsigned long flags;
2650         struct moschip_port *mos7840_port;
2651         dbg("%s", " disconnect :entering..........");
2652
2653         if (!serial) {
2654                 dbg("%s", "Invalid Handler");
2655                 return;
2656         }
2657
2658         /* check for the ports to be closed,close the ports and disconnect */
2659
2660         /* free private structure allocated for serial port  *
2661          * stop reads and writes on all ports                */
2662
2663         for (i = 0; i < serial->num_ports; ++i) {
2664                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2665                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2666                 if (mos7840_port) {
2667                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2668                         mos7840_port->zombie = 1;
2669                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2670                         usb_kill_urb(mos7840_port->control_urb);
2671                 }
2672         }
2673
2674         dbg("%s", "Thank u :: ");
2675
2676 }
2677
2678 /****************************************************************************
2679  * mos7840_release
2680  *      This function is called when the usb_serial structure is freed.
2681  ****************************************************************************/
2682
2683 static void mos7840_release(struct usb_serial *serial)
2684 {
2685         int i;
2686         struct moschip_port *mos7840_port;
2687         dbg("%s", " release :entering..........");
2688
2689         if (!serial) {
2690                 dbg("%s", "Invalid Handler");
2691                 return;
2692         }
2693
2694         /* check for the ports to be closed,close the ports and disconnect */
2695
2696         /* free private structure allocated for serial port  *
2697          * stop reads and writes on all ports                */
2698
2699         for (i = 0; i < serial->num_ports; ++i) {
2700                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2701                 dbg("mos7840_port %d = %p", i, mos7840_port);
2702                 if (mos7840_port) {
2703                         kfree(mos7840_port->ctrl_buf);
2704                         kfree(mos7840_port->dr);
2705                         kfree(mos7840_port);
2706                 }
2707         }
2708
2709         dbg("%s", "Thank u :: ");
2710
2711 }
2712
2713 static struct usb_driver io_driver = {
2714         .name = "mos7840",
2715         .probe = usb_serial_probe,
2716         .disconnect = usb_serial_disconnect,
2717         .id_table = moschip_id_table_combined,
2718         .no_dynamic_id = 1,
2719 };
2720
2721 static struct usb_serial_driver moschip7840_4port_device = {
2722         .driver = {
2723                    .owner = THIS_MODULE,
2724                    .name = "mos7840",
2725                    },
2726         .description = DRIVER_DESC,
2727         .usb_driver = &io_driver,
2728         .id_table = moschip_port_id_table,
2729         .num_ports = 4,
2730         .open = mos7840_open,
2731         .close = mos7840_close,
2732         .write = mos7840_write,
2733         .write_room = mos7840_write_room,
2734         .chars_in_buffer = mos7840_chars_in_buffer,
2735         .throttle = mos7840_throttle,
2736         .unthrottle = mos7840_unthrottle,
2737         .calc_num_ports = mos7840_calc_num_ports,
2738 #ifdef MCSSerialProbe
2739         .probe = mos7840_serial_probe,
2740 #endif
2741         .ioctl = mos7840_ioctl,
2742         .set_termios = mos7840_set_termios,
2743         .break_ctl = mos7840_break,
2744         .tiocmget = mos7840_tiocmget,
2745         .tiocmset = mos7840_tiocmset,
2746         .attach = mos7840_startup,
2747         .disconnect = mos7840_disconnect,
2748         .release = mos7840_release,
2749         .read_bulk_callback = mos7840_bulk_in_callback,
2750         .read_int_callback = mos7840_interrupt_callback,
2751 };
2752
2753 /****************************************************************************
2754  * moschip7840_init
2755  *      This is called by the module subsystem, or on startup to initialize us
2756  ****************************************************************************/
2757 static int __init moschip7840_init(void)
2758 {
2759         int retval;
2760
2761         dbg("%s", " mos7840_init :entering..........");
2762
2763         /* Register with the usb serial */
2764         retval = usb_serial_register(&moschip7840_4port_device);
2765
2766         if (retval)
2767                 goto failed_port_device_register;
2768
2769         dbg("%s", "Entering...");
2770         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2771                DRIVER_DESC "\n");
2772
2773         /* Register with the usb */
2774         retval = usb_register(&io_driver);
2775         if (retval == 0) {
2776                 dbg("%s", "Leaving...");
2777                 return 0;
2778         }
2779         usb_serial_deregister(&moschip7840_4port_device);
2780 failed_port_device_register:
2781         return retval;
2782 }
2783
2784 /****************************************************************************
2785  * moschip7840_exit
2786  *      Called when the driver is about to be unloaded.
2787  ****************************************************************************/
2788 static void __exit moschip7840_exit(void)
2789 {
2790
2791         dbg("%s", " mos7840_exit :entering..........");
2792
2793         usb_deregister(&io_driver);
2794
2795         usb_serial_deregister(&moschip7840_4port_device);
2796
2797         dbg("%s", "Entering...");
2798 }
2799
2800 module_init(moschip7840_init);
2801 module_exit(moschip7840_exit);
2802
2803 /* Module information */
2804 MODULE_DESCRIPTION(DRIVER_DESC);
2805 MODULE_LICENSE("GPL");
2806
2807 module_param(debug, bool, S_IRUGO | S_IWUSR);
2808 MODULE_PARM_DESC(debug, "Debug enabled or not");