drivers/usb/serial/spcp8x5.c

   1 /*
   2  * spcp8x5 USB to serial adaptor driver
   3  *
   4  * Copyright (C) 2006 Linxb (xubin.lin@worldplus.com.cn)
   5  * Copyright (C) 2006 S1 Corp.
   6  *
   7  * Original driver for 2.6.10 pl2303 driver by
   8  *   Greg Kroah-Hartman (greg@kroah.com)
   9  * Changes for 2.6.20 by Harald Klein <hari@vt100.at>
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  *
  17  */
  18 #include <linux/kernel.h>
  19 #include <linux/errno.h>
  20 #include <linux/init.h>
  21 #include <linux/slab.h>
  22 #include <linux/tty.h>
  23 #include <linux/tty_driver.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/module.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/usb.h>
  28 #include <linux/usb/serial.h>
  29
  30
  31 /* Version Information */
  32 #define DRIVER_VERSION  "v0.04"
  33 #define DRIVER_DESC     "SPCP8x5 USB to serial adaptor driver"
  34
  35 static int debug;
  36
  37 #define SPCP8x5_007_VID         0x04FC
  38 #define SPCP8x5_007_PID         0x0201
  39 #define SPCP8x5_008_VID         0x04fc
  40 #define SPCP8x5_008_PID         0x0235
  41 #define SPCP8x5_PHILIPS_VID     0x0471
  42 #define SPCP8x5_PHILIPS_PID     0x081e
  43 #define SPCP8x5_INTERMATIC_VID  0x04FC
  44 #define SPCP8x5_INTERMATIC_PID  0x0204
  45 #define SPCP8x5_835_VID         0x04fc
  46 #define SPCP8x5_835_PID         0x0231
  47
  48 static struct usb_device_id id_table [] = {
  49         { USB_DEVICE(SPCP8x5_PHILIPS_VID , SPCP8x5_PHILIPS_PID)},
  50         { USB_DEVICE(SPCP8x5_INTERMATIC_VID, SPCP8x5_INTERMATIC_PID)},
  51         { USB_DEVICE(SPCP8x5_835_VID, SPCP8x5_835_PID)},
  52         { USB_DEVICE(SPCP8x5_008_VID, SPCP8x5_008_PID)},
  53         { USB_DEVICE(SPCP8x5_007_VID, SPCP8x5_007_PID)},
  54         { }                                     /* Terminating entry */
  55 };
  56 MODULE_DEVICE_TABLE(usb, id_table);
  57
  58 struct spcp8x5_usb_ctrl_arg {
  59         u8      type;
  60         u8      cmd;
  61         u8      cmd_type;
  62         u16     value;
  63         u16     index;
  64         u16     length;
  65 };
  66
  67 /* wait 30s before close */
  68 #define SPCP8x5_CLOSING_WAIT    (30*HZ)
  69
  70 #define SPCP8x5_BUF_SIZE        1024
  71
  72
  73 /* spcp8x5 spec register define */
  74 #define MCR_CONTROL_LINE_RTS            0x02
  75 #define MCR_CONTROL_LINE_DTR            0x01
  76 #define MCR_DTR                         0x01
  77 #define MCR_RTS                         0x02
  78
  79 #define MSR_STATUS_LINE_DCD             0x80
  80 #define MSR_STATUS_LINE_RI              0x40
  81 #define MSR_STATUS_LINE_DSR             0x20
  82 #define MSR_STATUS_LINE_CTS             0x10
  83
  84 /* verdor command here , we should define myself */
  85 #define SET_DEFAULT                     0x40
  86 #define SET_DEFAULT_TYPE                0x20
  87
  88 #define SET_UART_FORMAT                 0x40
  89 #define SET_UART_FORMAT_TYPE            0x21
  90 #define SET_UART_FORMAT_SIZE_5          0x00
  91 #define SET_UART_FORMAT_SIZE_6          0x01
  92 #define SET_UART_FORMAT_SIZE_7          0x02
  93 #define SET_UART_FORMAT_SIZE_8          0x03
  94 #define SET_UART_FORMAT_STOP_1          0x00
  95 #define SET_UART_FORMAT_STOP_2          0x04
  96 #define SET_UART_FORMAT_PAR_NONE        0x00
  97 #define SET_UART_FORMAT_PAR_ODD         0x10
  98 #define SET_UART_FORMAT_PAR_EVEN        0x30
  99 #define SET_UART_FORMAT_PAR_MASK        0xD0
 100 #define SET_UART_FORMAT_PAR_SPACE       0x90
 101
 102 #define GET_UART_STATUS_TYPE            0xc0
 103 #define GET_UART_STATUS                 0x22
 104 #define GET_UART_STATUS_MSR             0x06
 105
 106 #define SET_UART_STATUS                 0x40
 107 #define SET_UART_STATUS_TYPE            0x23
 108 #define SET_UART_STATUS_MCR             0x0004
 109 #define SET_UART_STATUS_MCR_DTR         0x01
 110 #define SET_UART_STATUS_MCR_RTS         0x02
 111 #define SET_UART_STATUS_MCR_LOOP        0x10
 112
 113 #define SET_WORKING_MODE                0x40
 114 #define SET_WORKING_MODE_TYPE           0x24
 115 #define SET_WORKING_MODE_U2C            0x00
 116 #define SET_WORKING_MODE_RS485          0x01
 117 #define SET_WORKING_MODE_PDMA           0x02
 118 #define SET_WORKING_MODE_SPP            0x03
 119
 120 #define SET_FLOWCTL_CHAR                0x40
 121 #define SET_FLOWCTL_CHAR_TYPE           0x25
 122
 123 #define GET_VERSION                     0xc0
 124 #define GET_VERSION_TYPE                0x26
 125
 126 #define SET_REGISTER                    0x40
 127 #define SET_REGISTER_TYPE               0x27
 128
 129 #define GET_REGISTER                    0xc0
 130 #define GET_REGISTER_TYPE               0x28
 131
 132 #define SET_RAM                         0x40
 133 #define SET_RAM_TYPE                    0x31
 134
 135 #define GET_RAM                         0xc0
 136 #define GET_RAM_TYPE                    0x32
 137
 138 /* how come ??? */
 139 #define UART_STATE                      0x08
 140 #define UART_STATE_TRANSIENT_MASK       0x74
 141 #define UART_DCD                        0x01
 142 #define UART_DSR                        0x02
 143 #define UART_BREAK_ERROR                0x04
 144 #define UART_RING                       0x08
 145 #define UART_FRAME_ERROR                0x10
 146 #define UART_PARITY_ERROR               0x20
 147 #define UART_OVERRUN_ERROR              0x40
 148 #define UART_CTS                        0x80
 149
 150 enum spcp8x5_type {
 151         SPCP825_007_TYPE,
 152         SPCP825_008_TYPE,
 153         SPCP825_PHILIP_TYPE,
 154         SPCP825_INTERMATIC_TYPE,
 155         SPCP835_TYPE,
 156 };
 157
 158 /* 1st in 1st out buffer 4 driver */
 159 struct ringbuf {
 160         unsigned int    buf_size;
 161         char            *buf_buf;
 162         char            *buf_get;
 163         char            *buf_put;
 164 };
 165
 166 /* alloc the ring buf and alloc the buffer itself */
 167 static inline struct ringbuf *alloc_ringbuf(unsigned int size)
 168 {
 169         struct ringbuf *pb;
 170
 171         if (size == 0)
 172                 return NULL;
 173
 174         pb = kmalloc(sizeof(*pb), GFP_KERNEL);
 175         if (pb == NULL)
 176                 return NULL;
 177
 178         pb->buf_buf = kmalloc(size, GFP_KERNEL);
 179         if (pb->buf_buf == NULL) {
 180                 kfree(pb);
 181                 return NULL;
 182         }
 183
 184         pb->buf_size = size;
 185         pb->buf_get = pb->buf_put = pb->buf_buf;
 186
 187         return pb;
 188 }
 189
 190 /* free the ring buf and the buffer itself */
 191 static inline void free_ringbuf(struct ringbuf *pb)
 192 {
 193         if (pb != NULL) {
 194                 kfree(pb->buf_buf);
 195                 kfree(pb);
 196         }
 197 }
 198
 199 /* clear pipo , juest repoint the pointer here */
 200 static inline void clear_ringbuf(struct ringbuf *pb)
 201 {
 202         if (pb != NULL)
 203                 pb->buf_get = pb->buf_put;
 204 }
 205
 206 /* get the number of data in the pipo */
 207 static inline unsigned int ringbuf_avail_data(struct ringbuf *pb)
 208 {
 209         if (pb == NULL)
 210                 return 0;
 211         return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size;
 212 }
 213
 214 /* get the number of space in the pipo */
 215 static inline unsigned int ringbuf_avail_space(struct ringbuf *pb)
 216 {
 217         if (pb == NULL)
 218                 return 0;
 219         return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size;
 220 }
 221
 222 /* put count data into pipo */
 223 static unsigned int put_ringbuf(struct ringbuf *pb, const char *buf,
 224                                 unsigned int count)
 225 {
 226         unsigned int len;
 227
 228         if (pb == NULL)
 229                 return 0;
 230
 231         len  = ringbuf_avail_space(pb);
 232         if (count > len)
 233                 count = len;
 234
 235         if (count == 0)
 236                 return 0;
 237
 238         len = pb->buf_buf + pb->buf_size - pb->buf_put;
 239         if (count > len) {
 240                 memcpy(pb->buf_put, buf, len);
 241                 memcpy(pb->buf_buf, buf+len, count - len);
 242                 pb->buf_put = pb->buf_buf + count - len;
 243         } else {
 244                 memcpy(pb->buf_put, buf, count);
 245                 if (count < len)
 246                         pb->buf_put += count;
 247                 else /* count == len */
 248                         pb->buf_put = pb->buf_buf;
 249         }
 250         return count;
 251 }
 252
 253 /* get count data from pipo */
 254 static unsigned int get_ringbuf(struct ringbuf *pb, char *buf,
 255                                 unsigned int count)
 256 {
 257         unsigned int len;
 258
 259         if (pb == NULL || buf == NULL)
 260                 return 0;
 261
 262         len = ringbuf_avail_data(pb);
 263         if (count > len)
 264                 count = len;
 265
 266         if (count == 0)
 267                 return 0;
 268
 269         len = pb->buf_buf + pb->buf_size - pb->buf_get;
 270         if (count > len) {
 271                 memcpy(buf, pb->buf_get, len);
 272                 memcpy(buf+len, pb->buf_buf, count - len);
 273                 pb->buf_get = pb->buf_buf + count - len;
 274         } else {
 275                 memcpy(buf, pb->buf_get, count);
 276                 if (count < len)
 277                         pb->buf_get += count;
 278                 else /* count == len */
 279                         pb->buf_get = pb->buf_buf;
 280         }
 281
 282         return count;
 283 }
 284
 285 static struct usb_driver spcp8x5_driver = {
 286         .name =                 "spcp8x5",
 287         .probe =                usb_serial_probe,
 288         .disconnect =           usb_serial_disconnect,
 289         .id_table =             id_table,
 290         .no_dynamic_id =        1,
 291 };
 292
 293
 294 struct spcp8x5_private {
 295         spinlock_t      lock;
 296         struct ringbuf  *buf;
 297         int             write_urb_in_use;
 298         enum spcp8x5_type       type;
 299         wait_queue_head_t       delta_msr_wait;
 300         u8                      line_control;
 301         u8                      line_status;
 302         u8                      termios_initialized;
 303 };
 304
 305 /* desc : when device plug in,this function would be called.
 306  * thanks to usb_serial subsystem,then do almost every things for us. And what
 307  * we should do just alloc the buffer */
 308 static int spcp8x5_startup(struct usb_serial *serial)
 309 {
 310         struct spcp8x5_private *priv;
 311         int i;
 312         enum spcp8x5_type type = SPCP825_007_TYPE;
 313         u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
 314
 315         if (product == 0x0201)
 316                 type = SPCP825_007_TYPE;
 317         else if (product == 0x0231)
 318                 type = SPCP835_TYPE;
 319         else if (product == 0x0235)
 320                 type = SPCP825_008_TYPE;
 321         else if (product == 0x0204)
 322                 type = SPCP825_INTERMATIC_TYPE;
 323         else if (product == 0x0471 &&
 324                  serial->dev->descriptor.idVendor == cpu_to_le16(0x081e))
 325                 type = SPCP825_PHILIP_TYPE;
 326         dev_dbg(&serial->dev->dev, "device type = %d\n", (int)type);
 327
 328         for (i = 0; i < serial->num_ports; ++i) {
 329                 priv = kzalloc(sizeof(struct spcp8x5_private), GFP_KERNEL);
 330                 if (!priv)
 331                         goto cleanup;
 332
 333                 spin_lock_init(&priv->lock);
 334                 priv->buf = alloc_ringbuf(SPCP8x5_BUF_SIZE);
 335                 if (priv->buf == NULL)
 336                         goto cleanup2;
 337
 338                 init_waitqueue_head(&priv->delta_msr_wait);
 339                 priv->type = type;
 340                 usb_set_serial_port_data(serial->port[i] , priv);
 341
 342         }
 343
 344         return 0;
 345
 346 cleanup2:
 347         kfree(priv);
 348 cleanup:
 349         for (--i; i >= 0; --i) {
 350                 priv = usb_get_serial_port_data(serial->port[i]);
 351                 free_ringbuf(priv->buf);
 352                 kfree(priv);
 353                 usb_set_serial_port_data(serial->port[i] , NULL);
 354         }
 355         return -ENOMEM;
 356 }
 357
 358 /* call when the device plug out. free all the memory alloced by probe */
 359 static void spcp8x5_release(struct usb_serial *serial)
 360 {
 361         int i;
 362         struct spcp8x5_private *priv;
 363
 364         for (i = 0; i < serial->num_ports; i++) {
 365                 priv = usb_get_serial_port_data(serial->port[i]);
 366                 if (priv) {
 367                         free_ringbuf(priv->buf);
 368                         kfree(priv);
 369                 }
 370         }
 371 }
 372
 373 /* set the modem control line of the device.
 374  * NOTE spcp825-007 not supported this */
 375 static int spcp8x5_set_ctrlLine(struct usb_device *dev, u8 value,
 376                                 enum spcp8x5_type type)
 377 {
 378         int retval;
 379         u8 mcr = 0 ;
 380
 381         if (type == SPCP825_007_TYPE)
 382                 return -EPERM;
 383
 384         mcr = (unsigned short)value;
 385         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 386                                  SET_UART_STATUS_TYPE, SET_UART_STATUS,
 387                                  mcr, 0x04, NULL, 0, 100);
 388         if (retval != 0)
 389                 dev_dbg(&dev->dev, "usb_control_msg return %#x\n", retval);
 390         return retval;
 391 }
 392
 393 /* get the modem status register of the device
 394  * NOTE spcp825-007 not supported this */
 395 static int spcp8x5_get_msr(struct usb_device *dev, u8 *status,
 396                            enum spcp8x5_type type)
 397 {
 398         u8 *status_buffer;
 399         int ret;
 400
 401         /* I return Permited not support here but seem inval device
 402          * is more fix */
 403         if (type == SPCP825_007_TYPE)
 404                 return -EPERM;
 405         if (status == NULL)
 406                 return -EINVAL;
 407
 408         status_buffer = kmalloc(1, GFP_KERNEL);
 409         if (!status_buffer)
 410                 return -ENOMEM;
 411         status_buffer[0] = status[0];
 412
 413         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 414                               GET_UART_STATUS, GET_UART_STATUS_TYPE,
 415                               0, GET_UART_STATUS_MSR, status_buffer, 1, 100);
 416         if (ret < 0)
 417                 dev_dbg(&dev->dev, "Get MSR = 0x%p failed (error = %d)",
 418                         status_buffer, ret);
 419
 420         dev_dbg(&dev->dev, "0xc0:0x22:0:6  %d - 0x%p ", ret, status_buffer);
 421         status[0] = status_buffer[0];
 422         kfree(status_buffer);
 423
 424         return ret;
 425 }
 426
 427 /* select the work mode.
 428  * NOTE this function not supported by spcp825-007 */
 429 static void spcp8x5_set_workMode(struct usb_device *dev, u16 value,
 430                                  u16 index, enum spcp8x5_type type)
 431 {
 432         int ret;
 433
 434         /* I return Permited not support here but seem inval device
 435          * is more fix */
 436         if (type == SPCP825_007_TYPE)
 437                 return;
 438
 439         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 440                               SET_WORKING_MODE_TYPE, SET_WORKING_MODE,
 441                               value, index, NULL, 0, 100);
 442         dev_dbg(&dev->dev, "value = %#x , index = %#x\n", value, index);
 443         if (ret < 0)
 444                 dev_dbg(&dev->dev,
 445                         "RTSCTS usb_control_msg(enable flowctrl) = %d\n", ret);
 446 }
 447
 448 static int spcp8x5_carrier_raised(struct usb_serial_port *port)
 449 {
 450         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 451         if (priv->line_status & MSR_STATUS_LINE_DCD)
 452                 return 1;
 453         return 0;
 454 }
 455
 456 static void spcp8x5_dtr_rts(struct usb_serial_port *port, int on)
 457 {
 458         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 459         unsigned long flags;
 460         u8 control;
 461
 462         spin_lock_irqsave(&priv->lock, flags);
 463         if (on)
 464                 priv->line_control = MCR_CONTROL_LINE_DTR
 465                                                 | MCR_CONTROL_LINE_RTS;
 466         else
 467                 priv->line_control &= ~ (MCR_CONTROL_LINE_DTR
 468                                                 | MCR_CONTROL_LINE_RTS);
 469         control = priv->line_control;
 470         spin_unlock_irqrestore(&priv->lock, flags);
 471         spcp8x5_set_ctrlLine(port->serial->dev, control , priv->type);
 472 }
 473
 474 /* close the serial port. We should wait for data sending to device 1st and
 475  * then kill all urb. */
 476 static void spcp8x5_close(struct usb_serial_port *port)
 477 {
 478         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 479         unsigned long flags;
 480         int result;
 481
 482         dbg("%s - port %d", __func__, port->number);
 483
 484         spin_lock_irqsave(&priv->lock, flags);
 485         /* clear out any remaining data in the buffer */
 486         clear_ringbuf(priv->buf);
 487         spin_unlock_irqrestore(&priv->lock, flags);
 488
 489         /* kill urb */
 490         if (port->write_urb != NULL) {
 491                 result = usb_unlink_urb(port->write_urb);
 492                 if (result)
 493                         dev_dbg(&port->dev,
 494                                 "usb_unlink_urb(write_urb) = %d\n", result);
 495         }
 496         result = usb_unlink_urb(port->read_urb);
 497         if (result)
 498                 dev_dbg(&port->dev, "usb_unlink_urb(read_urb) = %d\n", result);
 499 }
 500
 501 /* set the serial param for transfer. we should check if we really need to
 502  * transfer. if we set flow control we should do this too. */
 503 static void spcp8x5_set_termios(struct tty_struct *tty,
 504                 struct usb_serial_port *port, struct ktermios *old_termios)
 505 {
 506         struct usb_serial *serial = port->serial;
 507         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 508         unsigned long flags;
 509         unsigned int cflag = tty->termios->c_cflag;
 510         unsigned int old_cflag = old_termios->c_cflag;
 511         unsigned short uartdata;
 512         unsigned char buf[2] = {0, 0};
 513         int baud;
 514         int i;
 515         u8 control;
 516
 517         /* for the 1st time call this function */
 518         spin_lock_irqsave(&priv->lock, flags);
 519         if (!priv->termios_initialized) {
 520                 *(tty->termios) = tty_std_termios;
 521                 tty->termios->c_cflag = B115200 | CS8 | CREAD | HUPCL | CLOCAL;
 522                 tty->termios->c_ispeed = 115200;
 523                 tty->termios->c_ospeed = 115200;
 524                 priv->termios_initialized = 1;
 525         }
 526         spin_unlock_irqrestore(&priv->lock, flags);
 527
 528         /* check that they really want us to change something */
 529         if (!tty_termios_hw_change(tty->termios, old_termios))
 530                 return;
 531
 532         /* set DTR/RTS active */
 533         spin_lock_irqsave(&priv->lock, flags);
 534         control = priv->line_control;
 535         if ((old_cflag & CBAUD) == B0) {
 536                 priv->line_control |= MCR_DTR;
 537                 if (!(old_cflag & CRTSCTS))
 538                         priv->line_control |= MCR_RTS;
 539         }
 540         if (control != priv->line_control) {
 541                 control = priv->line_control;
 542                 spin_unlock_irqrestore(&priv->lock, flags);
 543                 spcp8x5_set_ctrlLine(serial->dev, control , priv->type);
 544         } else {
 545                 spin_unlock_irqrestore(&priv->lock, flags);
 546         }
 547
 548         /* Set Baud Rate */
 549         baud = tty_get_baud_rate(tty);;
 550         switch (baud) {
 551         case 300:       buf[0] = 0x00;  break;
 552         case 600:       buf[0] = 0x01;  break;
 553         case 1200:      buf[0] = 0x02;  break;
 554         case 2400:      buf[0] = 0x03;  break;
 555         case 4800:      buf[0] = 0x04;  break;
 556         case 9600:      buf[0] = 0x05;  break;
 557         case 19200:     buf[0] = 0x07;  break;
 558         case 38400:     buf[0] = 0x09;  break;
 559         case 57600:     buf[0] = 0x0a;  break;
 560         case 115200:    buf[0] = 0x0b;  break;
 561         case 230400:    buf[0] = 0x0c;  break;
 562         case 460800:    buf[0] = 0x0d;  break;
 563         case 921600:    buf[0] = 0x0e;  break;
 564 /*      case 1200000:   buf[0] = 0x0f;  break; */
 565 /*      case 2400000:   buf[0] = 0x10;  break; */
 566         case 3000000:   buf[0] = 0x11;  break;
 567 /*      case 6000000:   buf[0] = 0x12;  break; */
 568         case 0:
 569         case 1000000:
 570                         buf[0] = 0x0b;  break;
 571         default:
 572                 dev_err(&port->dev, "spcp825 driver does not support the "
 573                         "baudrate requested, using default of 9600.\n");
 574         }
 575
 576         /* Set Data Length : 00:5bit, 01:6bit, 10:7bit, 11:8bit */
 577         if (cflag & CSIZE) {
 578                 switch (cflag & CSIZE) {
 579                 case CS5:
 580                         buf[1] |= SET_UART_FORMAT_SIZE_5;
 581                         break;
 582                 case CS6:
 583                         buf[1] |= SET_UART_FORMAT_SIZE_6;
 584                         break;
 585                 case CS7:
 586                         buf[1] |= SET_UART_FORMAT_SIZE_7;
 587                         break;
 588                 default:
 589                 case CS8:
 590                         buf[1] |= SET_UART_FORMAT_SIZE_8;
 591                         break;
 592                 }
 593         }
 594
 595         /* Set Stop bit2 : 0:1bit 1:2bit */
 596         buf[1] |= (cflag & CSTOPB) ? SET_UART_FORMAT_STOP_2 :
 597                                      SET_UART_FORMAT_STOP_1;
 598
 599         /* Set Parity bit3-4 01:Odd 11:Even */
 600         if (cflag & PARENB) {
 601                 buf[1] |= (cflag & PARODD) ?
 602                 SET_UART_FORMAT_PAR_ODD : SET_UART_FORMAT_PAR_EVEN ;
 603         } else
 604                 buf[1] |= SET_UART_FORMAT_PAR_NONE;
 605
 606         uartdata = buf[0] | buf[1]<<8;
 607
 608         i = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 609                             SET_UART_FORMAT_TYPE, SET_UART_FORMAT,
 610                             uartdata, 0, NULL, 0, 100);
 611         if (i < 0)
 612                 dev_err(&port->dev, "Set UART format %#x failed (error = %d)\n",
 613                         uartdata, i);
 614         dbg("0x21:0x40:0:0  %d\n", i);
 615
 616         if (cflag & CRTSCTS) {
 617                 /* enable hardware flow control */
 618                 spcp8x5_set_workMode(serial->dev, 0x000a,
 619                                      SET_WORKING_MODE_U2C, priv->type);
 620         }
 621         return;
 622 }
 623
 624 /* open the serial port. do some usb system call. set termios and get the line
 625  * status of the device. then submit the read urb */
 626 static int spcp8x5_open(struct tty_struct *tty, struct usb_serial_port *port)
 627 {
 628         struct ktermios tmp_termios;
 629         struct usb_serial *serial = port->serial;
 630         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 631         int ret;
 632         unsigned long flags;
 633         u8 status = 0x30;
 634         /* status 0x30 means DSR and CTS = 1 other CDC RI and delta = 0 */
 635
 636         dbg("%s -  port %d", __func__, port->number);
 637
 638         usb_clear_halt(serial->dev, port->write_urb->pipe);
 639         usb_clear_halt(serial->dev, port->read_urb->pipe);
 640
 641         ret = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 642                               0x09, 0x00,
 643                               0x01, 0x00, NULL, 0x00, 100);
 644         if (ret)
 645                 return ret;
 646
 647         spcp8x5_set_ctrlLine(serial->dev, priv->line_control , priv->type);
 648
 649         /* Setup termios */
 650         if (tty)
 651                 spcp8x5_set_termios(tty, port, &tmp_termios);
 652
 653         spcp8x5_get_msr(serial->dev, &status, priv->type);
 654
 655         /* may be we should update uart status here but now we did not do */
 656         spin_lock_irqsave(&priv->lock, flags);
 657         priv->line_status = status & 0xf0 ;
 658         spin_unlock_irqrestore(&priv->lock, flags);
 659
 660         dbg("%s - submitting read urb", __func__);
 661         port->read_urb->dev = serial->dev;
 662         ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
 663         if (ret) {
 664                 spcp8x5_close(port);
 665                 return -EPROTO;
 666         }
 667         port->port.drain_delay = 256;
 668         return 0;
 669 }
 670
 671 /* bulk read call back function. check the status of the urb. if transfer
 672  * failed return. then update the status and the tty send data to tty subsys.
 673  * submit urb again.
 674  */
 675 static void spcp8x5_read_bulk_callback(struct urb *urb)
 676 {
 677         struct usb_serial_port *port = urb->context;
 678         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 679         struct tty_struct *tty;
 680         unsigned char *data = urb->transfer_buffer;
 681         unsigned long flags;
 682         int i;
 683         int result = urb->status;
 684         u8 status;
 685         char tty_flag;
 686
 687         dev_dbg(&port->dev, "start, result = %d, urb->actual_length = %d\n,",
 688                 result, urb->actual_length);
 689
 690         /* check the urb status */
 691         if (result) {
 692                 if (!port->port.count)
 693                         return;
 694                 if (result == -EPROTO) {
 695                         /* spcp8x5 mysteriously fails with -EPROTO */
 696                         /* reschedule the read */
 697                         urb->dev = port->serial->dev;
 698                         result = usb_submit_urb(urb , GFP_ATOMIC);
 699                         if (result)
 700                                 dev_dbg(&port->dev,
 701                                         "failed submitting read urb %d\n",
 702                                         result);
 703                         return;
 704                 }
 705                 dev_dbg(&port->dev, "unable to handle the error, exiting.\n");
 706                 return;
 707         }
 708
 709         /* get tty_flag from status */
 710         tty_flag = TTY_NORMAL;
 711
 712         spin_lock_irqsave(&priv->lock, flags);
 713         status = priv->line_status;
 714         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 715         spin_unlock_irqrestore(&priv->lock, flags);
 716         /* wake up the wait for termios */
 717         wake_up_interruptible(&priv->delta_msr_wait);
 718
 719         /* break takes precedence over parity, which takes precedence over
 720          * framing errors */
 721         if (status & UART_BREAK_ERROR)
 722                 tty_flag = TTY_BREAK;
 723         else if (status & UART_PARITY_ERROR)
 724                 tty_flag = TTY_PARITY;
 725         else if (status & UART_FRAME_ERROR)
 726                 tty_flag = TTY_FRAME;
 727         dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag);
 728
 729         tty = tty_port_tty_get(&port->port);
 730         if (tty && urb->actual_length) {
 731                 tty_buffer_request_room(tty, urb->actual_length + 1);
 732                 /* overrun is special, not associated with a char */
 733                 if (status & UART_OVERRUN_ERROR)
 734                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 735                 for (i = 0; i < urb->actual_length; ++i)
 736                         tty_insert_flip_char(tty, data[i], tty_flag);
 737                 tty_flip_buffer_push(tty);
 738         }
 739         tty_kref_put(tty);
 740
 741         /* Schedule the next read _if_ we are still open */
 742         if (port->port.count) {
 743                 urb->dev = port->serial->dev;
 744                 result = usb_submit_urb(urb , GFP_ATOMIC);
 745                 if (result)
 746                         dev_dbg(&port->dev, "failed submitting read urb %d\n",
 747                                 result);
 748         }
 749
 750         return;
 751 }
 752
 753 /* get data from ring buffer and then write to usb bus */
 754 static void spcp8x5_send(struct usb_serial_port *port)
 755 {
 756         int count, result;
 757         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 758         unsigned long flags;
 759
 760         spin_lock_irqsave(&priv->lock, flags);
 761
 762         if (priv->write_urb_in_use) {
 763                 dev_dbg(&port->dev, "write urb still used\n");
 764                 spin_unlock_irqrestore(&priv->lock, flags);
 765                 return;
 766         }
 767
 768         /* send the 1st urb for writting */
 769         memset(port->write_urb->transfer_buffer , 0x00 , port->bulk_out_size);
 770         count = get_ringbuf(priv->buf, port->write_urb->transfer_buffer,
 771                 port->bulk_out_size);
 772
 773         if (count == 0) {
 774                 spin_unlock_irqrestore(&priv->lock, flags);
 775                 return;
 776         }
 777
 778         /* update the urb status */
 779         priv->write_urb_in_use = 1;
 780
 781         spin_unlock_irqrestore(&priv->lock, flags);
 782
 783         port->write_urb->transfer_buffer_length = count;
 784         port->write_urb->dev = port->serial->dev;
 785
 786         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 787         if (result) {
 788                 dev_dbg(&port->dev, "failed submitting write urb, error %d\n",
 789                         result);
 790                 priv->write_urb_in_use = 0;
 791                 /* TODO: reschedule spcp8x5_send */
 792         }
 793
 794
 795         schedule_work(&port->work);
 796 }
 797
 798 /* this is the call back function for write urb. NOTE we should not sleep in
 799  * this routine. check the urb return code and then submit the write urb again
 800  * to hold the write loop */
 801 static void spcp8x5_write_bulk_callback(struct urb *urb)
 802 {
 803         struct usb_serial_port *port = urb->context;
 804         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 805         int result;
 806         int status = urb->status;
 807
 808         switch (status) {
 809         case 0:
 810                 /* success */
 811                 break;
 812         case -ECONNRESET:
 813         case -ENOENT:
 814         case -ESHUTDOWN:
 815                 /* this urb is terminated, clean up */
 816                 dev_dbg(&port->dev, "urb shutting down with status: %d\n",
 817                         status);
 818                 priv->write_urb_in_use = 0;
 819                 return;
 820         default:
 821                 /* error in the urb, so we have to resubmit it */
 822                 dbg("%s - Overflow in write", __func__);
 823                 dbg("%s - nonzero write bulk status received: %d",
 824                         __func__, status);
 825                 port->write_urb->transfer_buffer_length = 1;
 826                 port->write_urb->dev = port->serial->dev;
 827                 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 828                 if (result)
 829                         dev_dbg(&port->dev,
 830                                 "failed resubmitting write urb %d\n", result);
 831                 else
 832                         return;
 833         }
 834
 835         priv->write_urb_in_use = 0;
 836
 837         /* send any buffered data */
 838         spcp8x5_send(port);
 839 }
 840
 841 /* write data to ring buffer. and then start the write transfer */
 842 static int spcp8x5_write(struct tty_struct *tty, struct usb_serial_port *port,
 843                          const unsigned char *buf, int count)
 844 {
 845         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 846         unsigned long flags;
 847
 848         dev_dbg(&port->dev, "%d bytes\n", count);
 849
 850         if (!count)
 851                 return count;
 852
 853         spin_lock_irqsave(&priv->lock, flags);
 854         count = put_ringbuf(priv->buf, buf, count);
 855         spin_unlock_irqrestore(&priv->lock, flags);
 856
 857         spcp8x5_send(port);
 858
 859         return count;
 860 }
 861
 862 static int spcp8x5_wait_modem_info(struct usb_serial_port *port,
 863                                    unsigned int arg)
 864 {
 865         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 866         unsigned long flags;
 867         unsigned int prevstatus;
 868         unsigned int status;
 869         unsigned int changed;
 870
 871         spin_lock_irqsave(&priv->lock, flags);
 872         prevstatus = priv->line_status;
 873         spin_unlock_irqrestore(&priv->lock, flags);
 874
 875         while (1) {
 876                 /* wake up in bulk read */
 877                 interruptible_sleep_on(&priv->delta_msr_wait);
 878
 879                 /* see if a signal did it */
 880                 if (signal_pending(current))
 881                         return -ERESTARTSYS;
 882
 883                 spin_lock_irqsave(&priv->lock, flags);
 884                 status = priv->line_status;
 885                 spin_unlock_irqrestore(&priv->lock, flags);
 886
 887                 changed = prevstatus^status;
 888
 889                 if (((arg & TIOCM_RNG) && (changed & MSR_STATUS_LINE_RI)) ||
 890                     ((arg & TIOCM_DSR) && (changed & MSR_STATUS_LINE_DSR)) ||
 891                     ((arg & TIOCM_CD)  && (changed & MSR_STATUS_LINE_DCD)) ||
 892                     ((arg & TIOCM_CTS) && (changed & MSR_STATUS_LINE_CTS)))
 893                         return 0;
 894
 895                 prevstatus = status;
 896         }
 897         /* NOTREACHED */
 898         return 0;
 899 }
 900
 901 static int spcp8x5_ioctl(struct tty_struct *tty, struct file *file,
 902                          unsigned int cmd, unsigned long arg)
 903 {
 904         struct usb_serial_port *port = tty->driver_data;
 905         dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd);
 906
 907         switch (cmd) {
 908         case TIOCMIWAIT:
 909                 dbg("%s (%d) TIOCMIWAIT", __func__,  port->number);
 910                 return spcp8x5_wait_modem_info(port, arg);
 911
 912         default:
 913                 dbg("%s not supported = 0x%04x", __func__, cmd);
 914                 break;
 915         }
 916
 917         return -ENOIOCTLCMD;
 918 }
 919
 920 static int spcp8x5_tiocmset(struct tty_struct *tty, struct file *file,
 921                             unsigned int set, unsigned int clear)
 922 {
 923         struct usb_serial_port *port = tty->driver_data;
 924         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 925         unsigned long flags;
 926         u8 control;
 927
 928         spin_lock_irqsave(&priv->lock, flags);
 929         if (set & TIOCM_RTS)
 930                 priv->line_control |= MCR_RTS;
 931         if (set & TIOCM_DTR)
 932                 priv->line_control |= MCR_DTR;
 933         if (clear & TIOCM_RTS)
 934                 priv->line_control &= ~MCR_RTS;
 935         if (clear & TIOCM_DTR)
 936                 priv->line_control &= ~MCR_DTR;
 937         control = priv->line_control;
 938         spin_unlock_irqrestore(&priv->lock, flags);
 939
 940         return spcp8x5_set_ctrlLine(port->serial->dev, control , priv->type);
 941 }
 942
 943 static int spcp8x5_tiocmget(struct tty_struct *tty, struct file *file)
 944 {
 945         struct usb_serial_port *port = tty->driver_data;
 946         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 947         unsigned long flags;
 948         unsigned int mcr;
 949         unsigned int status;
 950         unsigned int result;
 951
 952         spin_lock_irqsave(&priv->lock, flags);
 953         mcr = priv->line_control;
 954         status = priv->line_status;
 955         spin_unlock_irqrestore(&priv->lock, flags);
 956
 957         result = ((mcr & MCR_DTR)                       ? TIOCM_DTR : 0)
 958                   | ((mcr & MCR_RTS)                    ? TIOCM_RTS : 0)
 959                   | ((status & MSR_STATUS_LINE_CTS)     ? TIOCM_CTS : 0)
 960                   | ((status & MSR_STATUS_LINE_DSR)     ? TIOCM_DSR : 0)
 961                   | ((status & MSR_STATUS_LINE_RI)      ? TIOCM_RI  : 0)
 962                   | ((status & MSR_STATUS_LINE_DCD)     ? TIOCM_CD  : 0);
 963
 964         return result;
 965 }
 966
 967 /* get the avail space room in ring buffer */
 968 static int spcp8x5_write_room(struct tty_struct *tty)
 969 {
 970         struct usb_serial_port *port = tty->driver_data;
 971         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 972         int room = 0;
 973         unsigned long flags;
 974
 975         spin_lock_irqsave(&priv->lock, flags);
 976         room = ringbuf_avail_space(priv->buf);
 977         spin_unlock_irqrestore(&priv->lock, flags);
 978
 979         return room;
 980 }
 981
 982 /* get the number of avail data in write ring buffer */
 983 static int spcp8x5_chars_in_buffer(struct tty_struct *tty)
 984 {
 985         struct usb_serial_port *port = tty->driver_data;
 986         struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 987         int chars = 0;
 988         unsigned long flags;
 989
 990         spin_lock_irqsave(&priv->lock, flags);
 991         chars = ringbuf_avail_data(priv->buf);
 992         spin_unlock_irqrestore(&priv->lock, flags);
 993
 994         return chars;
 995 }
 996
 997 /* All of the device info needed for the spcp8x5 SIO serial converter */
 998 static struct usb_serial_driver spcp8x5_device = {
 999         .driver = {
1000                 .owner =        THIS_MODULE,
1001                 .name =         "SPCP8x5",
1002         },
1003         .id_table               = id_table,
1004         .num_ports              = 1,
1005         .open                   = spcp8x5_open,
1006         .close                  = spcp8x5_close,
1007         .dtr_rts                = spcp8x5_dtr_rts,
1008         .carrier_raised         = spcp8x5_carrier_raised,
1009         .write                  = spcp8x5_write,
1010         .set_termios            = spcp8x5_set_termios,
1011         .ioctl                  = spcp8x5_ioctl,
1012         .tiocmget               = spcp8x5_tiocmget,
1013         .tiocmset               = spcp8x5_tiocmset,
1014         .write_room             = spcp8x5_write_room,
1015         .read_bulk_callback     = spcp8x5_read_bulk_callback,
1016         .write_bulk_callback    = spcp8x5_write_bulk_callback,
1017         .chars_in_buffer        = spcp8x5_chars_in_buffer,
1018         .attach                 = spcp8x5_startup,
1019         .release                = spcp8x5_release,
1020 };
1021
1022 static int __init spcp8x5_init(void)
1023 {
1024         int retval;
1025         retval = usb_serial_register(&spcp8x5_device);
1026         if (retval)
1027                 goto failed_usb_serial_register;
1028         retval = usb_register(&spcp8x5_driver);
1029         if (retval)
1030                 goto failed_usb_register;
1031         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1032                DRIVER_DESC "\n");
1033         return 0;
1034 failed_usb_register:
1035         usb_serial_deregister(&spcp8x5_device);
1036 failed_usb_serial_register:
1037         return retval;
1038 }
1039
1040 static void __exit spcp8x5_exit(void)
1041 {
1042         usb_deregister(&spcp8x5_driver);
1043         usb_serial_deregister(&spcp8x5_device);
1044 }
1045
1046 module_init(spcp8x5_init);
1047 module_exit(spcp8x5_exit);
1048
1049 MODULE_DESCRIPTION(DRIVER_DESC);
1050 MODULE_VERSION(DRIVER_VERSION);
1051 MODULE_LICENSE("GPL");
1052
1053 module_param(debug, bool, S_IRUGO | S_IWUSR);
1054 MODULE_PARM_DESC(debug, "Debug enabled or not");