kernel/drivers/usb/serial/belkin_sa.c

   1 /*
   2  * Belkin USB Serial Adapter Driver
   3  *
   4  *  Copyright (C) 2000          William Greathouse (wgreathouse@smva.com)
   5  *  Copyright (C) 2000-2001     Greg Kroah-Hartman (greg@kroah.com)
   6  *  Copyright (C) 2010          Johan Hovold (jhovold@gmail.com)
   7  *
   8  *  This program is largely derived from work by the linux-usb group
   9  *  and associated source files.  Please see the usb/serial files for
  10  *  individual credits and copyrights.
  11  *
  12  *      This program is free software; you can redistribute it and/or modify
  13  *      it under the terms of the GNU General Public License as published by
  14  *      the Free Software Foundation; either version 2 of the License, or
  15  *      (at your option) any later version.
  16  *
  17  * See Documentation/usb/usb-serial.txt for more information on using this
  18  * driver
  19  *
  20  * TODO:
  21  * -- Add true modem control line query capability.  Currently we track the
  22  *    states reported by the interrupt and the states we request.
  23  * -- Add support for flush commands
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/errno.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/usb.h>
  36 #include <linux/usb/serial.h>
  37 #include "belkin_sa.h"
  38
  39 #define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>"
  40 #define DRIVER_DESC "USB Belkin Serial converter driver"
  41
  42 /* function prototypes for a Belkin USB Serial Adapter F5U103 */
  43 static int belkin_sa_port_probe(struct usb_serial_port *port);
  44 static int belkin_sa_port_remove(struct usb_serial_port *port);
  45 static int  belkin_sa_open(struct tty_struct *tty,
  46                         struct usb_serial_port *port);
  47 static void belkin_sa_close(struct usb_serial_port *port);
  48 static void belkin_sa_read_int_callback(struct urb *urb);
  49 static void belkin_sa_process_read_urb(struct urb *urb);
  50 static void belkin_sa_set_termios(struct tty_struct *tty,
  51                         struct usb_serial_port *port, struct ktermios * old);
  52 static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state);
  53 static int  belkin_sa_tiocmget(struct tty_struct *tty);
  54 static int  belkin_sa_tiocmset(struct tty_struct *tty,
  55                                         unsigned int set, unsigned int clear);
  56
  57
  58 static const struct usb_device_id id_table[] = {
  59         { USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) },
  60         { USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) },
  61         { USB_DEVICE(PERACOM_VID, PERACOM_PID) },
  62         { USB_DEVICE(GOHUBS_VID, GOHUBS_PID) },
  63         { USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) },
  64         { USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) },
  65         { }     /* Terminating entry */
  66 };
  67 MODULE_DEVICE_TABLE(usb, id_table);
  68
  69 /* All of the device info needed for the serial converters */
  70 static struct usb_serial_driver belkin_device = {
  71         .driver = {
  72                 .owner =        THIS_MODULE,
  73                 .name =         "belkin",
  74         },
  75         .description =          "Belkin / Peracom / GoHubs USB Serial Adapter",
  76         .id_table =             id_table,
  77         .num_ports =            1,
  78         .open =                 belkin_sa_open,
  79         .close =                belkin_sa_close,
  80         .read_int_callback =    belkin_sa_read_int_callback,
  81         .process_read_urb =     belkin_sa_process_read_urb,
  82         .set_termios =          belkin_sa_set_termios,
  83         .break_ctl =            belkin_sa_break_ctl,
  84         .tiocmget =             belkin_sa_tiocmget,
  85         .tiocmset =             belkin_sa_tiocmset,
  86         .port_probe =           belkin_sa_port_probe,
  87         .port_remove =          belkin_sa_port_remove,
  88 };
  89
  90 static struct usb_serial_driver * const serial_drivers[] = {
  91         &belkin_device, NULL
  92 };
  93
  94 struct belkin_sa_private {
  95         spinlock_t              lock;
  96         unsigned long           control_state;
  97         unsigned char           last_lsr;
  98         unsigned char           last_msr;
  99         int                     bad_flow_control;
 100 };
 101
 102
 103 /*
 104  * ***************************************************************************
 105  * Belkin USB Serial Adapter F5U103 specific driver functions
 106  * ***************************************************************************
 107  */
 108
 109 #define WDR_TIMEOUT 5000 /* default urb timeout */
 110
 111 /* assumes that struct usb_serial *serial is available */
 112 #define BSA_USB_CMD(c, v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
 113                                             (c), BELKIN_SA_SET_REQUEST_TYPE, \
 114                                             (v), 0, NULL, 0, WDR_TIMEOUT)
 115
 116 static int belkin_sa_port_probe(struct usb_serial_port *port)
 117 {
 118         struct usb_device *dev = port->serial->dev;
 119         struct belkin_sa_private *priv;
 120
 121         priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
 122         if (!priv)
 123                 return -ENOMEM;
 124
 125         spin_lock_init(&priv->lock);
 126         priv->control_state = 0;
 127         priv->last_lsr = 0;
 128         priv->last_msr = 0;
 129         /* see comments at top of file */
 130         priv->bad_flow_control =
 131                 (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
 132         dev_info(&dev->dev, "bcdDevice: %04x, bfc: %d\n",
 133                                         le16_to_cpu(dev->descriptor.bcdDevice),
 134                                         priv->bad_flow_control);
 135
 136         usb_set_serial_port_data(port, priv);
 137
 138         return 0;
 139 }
 140
 141 static int belkin_sa_port_remove(struct usb_serial_port *port)
 142 {
 143         struct belkin_sa_private *priv;
 144
 145         priv = usb_get_serial_port_data(port);
 146         kfree(priv);
 147
 148         return 0;
 149 }
 150
 151 static int belkin_sa_open(struct tty_struct *tty,
 152                                         struct usb_serial_port *port)
 153 {
 154         int retval;
 155
 156         retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 157         if (retval) {
 158                 dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
 159                 return retval;
 160         }
 161
 162         retval = usb_serial_generic_open(tty, port);
 163         if (retval)
 164                 usb_kill_urb(port->interrupt_in_urb);
 165
 166         return retval;
 167 }
 168
 169 static void belkin_sa_close(struct usb_serial_port *port)
 170 {
 171         usb_serial_generic_close(port);
 172         usb_kill_urb(port->interrupt_in_urb);
 173 }
 174
 175 static void belkin_sa_read_int_callback(struct urb *urb)
 176 {
 177         struct usb_serial_port *port = urb->context;
 178         struct belkin_sa_private *priv;
 179         unsigned char *data = urb->transfer_buffer;
 180         int retval;
 181         int status = urb->status;
 182         unsigned long flags;
 183
 184         switch (status) {
 185         case 0:
 186                 /* success */
 187                 break;
 188         case -ECONNRESET:
 189         case -ENOENT:
 190         case -ESHUTDOWN:
 191                 /* this urb is terminated, clean up */
 192                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
 193                         __func__, status);
 194                 return;
 195         default:
 196                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
 197                         __func__, status);
 198                 goto exit;
 199         }
 200
 201         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 202
 203         /* Handle known interrupt data */
 204         /* ignore data[0] and data[1] */
 205
 206         priv = usb_get_serial_port_data(port);
 207         spin_lock_irqsave(&priv->lock, flags);
 208         priv->last_msr = data[BELKIN_SA_MSR_INDEX];
 209
 210         /* Record Control Line states */
 211         if (priv->last_msr & BELKIN_SA_MSR_DSR)
 212                 priv->control_state |= TIOCM_DSR;
 213         else
 214                 priv->control_state &= ~TIOCM_DSR;
 215
 216         if (priv->last_msr & BELKIN_SA_MSR_CTS)
 217                 priv->control_state |= TIOCM_CTS;
 218         else
 219                 priv->control_state &= ~TIOCM_CTS;
 220
 221         if (priv->last_msr & BELKIN_SA_MSR_RI)
 222                 priv->control_state |= TIOCM_RI;
 223         else
 224                 priv->control_state &= ~TIOCM_RI;
 225
 226         if (priv->last_msr & BELKIN_SA_MSR_CD)
 227                 priv->control_state |= TIOCM_CD;
 228         else
 229                 priv->control_state &= ~TIOCM_CD;
 230
 231         priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
 232         spin_unlock_irqrestore(&priv->lock, flags);
 233 exit:
 234         retval = usb_submit_urb(urb, GFP_ATOMIC);
 235         if (retval)
 236                 dev_err(&port->dev, "%s - usb_submit_urb failed with "
 237                         "result %d\n", __func__, retval);
 238 }
 239
 240 static void belkin_sa_process_read_urb(struct urb *urb)
 241 {
 242         struct usb_serial_port *port = urb->context;
 243         struct belkin_sa_private *priv = usb_get_serial_port_data(port);
 244         unsigned char *data = urb->transfer_buffer;
 245         unsigned long flags;
 246         unsigned char status;
 247         char tty_flag;
 248
 249         /* Update line status */
 250         tty_flag = TTY_NORMAL;
 251
 252         spin_lock_irqsave(&priv->lock, flags);
 253         status = priv->last_lsr;
 254         priv->last_lsr &= ~BELKIN_SA_LSR_ERR;
 255         spin_unlock_irqrestore(&priv->lock, flags);
 256
 257         if (!urb->actual_length)
 258                 return;
 259
 260         if (status & BELKIN_SA_LSR_ERR) {
 261                 /* Break takes precedence over parity, which takes precedence
 262                  * over framing errors. */
 263                 if (status & BELKIN_SA_LSR_BI)
 264                         tty_flag = TTY_BREAK;
 265                 else if (status & BELKIN_SA_LSR_PE)
 266                         tty_flag = TTY_PARITY;
 267                 else if (status & BELKIN_SA_LSR_FE)
 268                         tty_flag = TTY_FRAME;
 269                 dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag);
 270
 271                 /* Overrun is special, not associated with a char. */
 272                 if (status & BELKIN_SA_LSR_OE)
 273                         tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 274         }
 275
 276         tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
 277                                                         urb->actual_length);
 278         tty_flip_buffer_push(&port->port);
 279 }
 280
 281 static void belkin_sa_set_termios(struct tty_struct *tty,
 282                 struct usb_serial_port *port, struct ktermios *old_termios)
 283 {
 284         struct usb_serial *serial = port->serial;
 285         struct belkin_sa_private *priv = usb_get_serial_port_data(port);
 286         unsigned int iflag;
 287         unsigned int cflag;
 288         unsigned int old_iflag = 0;
 289         unsigned int old_cflag = 0;
 290         __u16 urb_value = 0; /* Will hold the new flags */
 291         unsigned long flags;
 292         unsigned long control_state;
 293         int bad_flow_control;
 294         speed_t baud;
 295         struct ktermios *termios = &tty->termios;
 296
 297         iflag = termios->c_iflag;
 298         cflag = termios->c_cflag;
 299
 300         termios->c_cflag &= ~CMSPAR;
 301
 302         /* get a local copy of the current port settings */
 303         spin_lock_irqsave(&priv->lock, flags);
 304         control_state = priv->control_state;
 305         bad_flow_control = priv->bad_flow_control;
 306         spin_unlock_irqrestore(&priv->lock, flags);
 307
 308         old_iflag = old_termios->c_iflag;
 309         old_cflag = old_termios->c_cflag;
 310
 311         /* Set the baud rate */
 312         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 313                 /* reassert DTR and (maybe) RTS on transition from B0 */
 314                 if ((old_cflag & CBAUD) == B0) {
 315                         control_state |= (TIOCM_DTR|TIOCM_RTS);
 316                         if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
 317                                 dev_err(&port->dev, "Set DTR error\n");
 318                         /* don't set RTS if using hardware flow control */
 319                         if (!(old_cflag & CRTSCTS))
 320                                 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST
 321                                                                 , 1) < 0)
 322                                         dev_err(&port->dev, "Set RTS error\n");
 323                 }
 324         }
 325
 326         baud = tty_get_baud_rate(tty);
 327         if (baud) {
 328                 urb_value = BELKIN_SA_BAUD(baud);
 329                 /* Clip to maximum speed */
 330                 if (urb_value == 0)
 331                         urb_value = 1;
 332                 /* Turn it back into a resulting real baud rate */
 333                 baud = BELKIN_SA_BAUD(urb_value);
 334
 335                 /* Report the actual baud rate back to the caller */
 336                 tty_encode_baud_rate(tty, baud, baud);
 337                 if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
 338                         dev_err(&port->dev, "Set baudrate error\n");
 339         } else {
 340                 /* Disable flow control */
 341                 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST,
 342                                                 BELKIN_SA_FLOW_NONE) < 0)
 343                         dev_err(&port->dev, "Disable flowcontrol error\n");
 344                 /* Drop RTS and DTR */
 345                 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 346                 if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
 347                         dev_err(&port->dev, "DTR LOW error\n");
 348                 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
 349                         dev_err(&port->dev, "RTS LOW error\n");
 350         }
 351
 352         /* set the parity */
 353         if ((cflag ^ old_cflag) & (PARENB | PARODD)) {
 354                 if (cflag & PARENB)
 355                         urb_value = (cflag & PARODD) ?  BELKIN_SA_PARITY_ODD
 356                                                 : BELKIN_SA_PARITY_EVEN;
 357                 else
 358                         urb_value = BELKIN_SA_PARITY_NONE;
 359                 if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
 360                         dev_err(&port->dev, "Set parity error\n");
 361         }
 362
 363         /* set the number of data bits */
 364         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 365                 switch (cflag & CSIZE) {
 366                 case CS5:
 367                         urb_value = BELKIN_SA_DATA_BITS(5);
 368                         break;
 369                 case CS6:
 370                         urb_value = BELKIN_SA_DATA_BITS(6);
 371                         break;
 372                 case CS7:
 373                         urb_value = BELKIN_SA_DATA_BITS(7);
 374                         break;
 375                 case CS8:
 376                         urb_value = BELKIN_SA_DATA_BITS(8);
 377                         break;
 378                 default:
 379                         dev_dbg(&port->dev,
 380                                 "CSIZE was not CS5-CS8, using default of 8\n");
 381                         urb_value = BELKIN_SA_DATA_BITS(8);
 382                         break;
 383                 }
 384                 if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
 385                         dev_err(&port->dev, "Set data bits error\n");
 386         }
 387
 388         /* set the number of stop bits */
 389         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 390                 urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2)
 391                                                 : BELKIN_SA_STOP_BITS(1);
 392                 if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST,
 393                                                         urb_value) < 0)
 394                         dev_err(&port->dev, "Set stop bits error\n");
 395         }
 396
 397         /* Set flow control */
 398         if (((iflag ^ old_iflag) & (IXOFF | IXON)) ||
 399                 ((cflag ^ old_cflag) & CRTSCTS)) {
 400                 urb_value = 0;
 401                 if ((iflag & IXOFF) || (iflag & IXON))
 402                         urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
 403                 else
 404                         urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
 405
 406                 if (cflag & CRTSCTS)
 407                         urb_value |=  (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
 408                 else
 409                         urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
 410
 411                 if (bad_flow_control)
 412                         urb_value &= ~(BELKIN_SA_FLOW_IRTS);
 413
 414                 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
 415                         dev_err(&port->dev, "Set flow control error\n");
 416         }
 417
 418         /* save off the modified port settings */
 419         spin_lock_irqsave(&priv->lock, flags);
 420         priv->control_state = control_state;
 421         spin_unlock_irqrestore(&priv->lock, flags);
 422 }
 423
 424 static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state)
 425 {
 426         struct usb_serial_port *port = tty->driver_data;
 427         struct usb_serial *serial = port->serial;
 428
 429         if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
 430                 dev_err(&port->dev, "Set break_ctl %d\n", break_state);
 431 }
 432
 433 static int belkin_sa_tiocmget(struct tty_struct *tty)
 434 {
 435         struct usb_serial_port *port = tty->driver_data;
 436         struct belkin_sa_private *priv = usb_get_serial_port_data(port);
 437         unsigned long control_state;
 438         unsigned long flags;
 439
 440         spin_lock_irqsave(&priv->lock, flags);
 441         control_state = priv->control_state;
 442         spin_unlock_irqrestore(&priv->lock, flags);
 443
 444         return control_state;
 445 }
 446
 447 static int belkin_sa_tiocmset(struct tty_struct *tty,
 448                                unsigned int set, unsigned int clear)
 449 {
 450         struct usb_serial_port *port = tty->driver_data;
 451         struct usb_serial *serial = port->serial;
 452         struct belkin_sa_private *priv = usb_get_serial_port_data(port);
 453         unsigned long control_state;
 454         unsigned long flags;
 455         int retval;
 456         int rts = 0;
 457         int dtr = 0;
 458
 459         spin_lock_irqsave(&priv->lock, flags);
 460         control_state = priv->control_state;
 461
 462         if (set & TIOCM_RTS) {
 463                 control_state |= TIOCM_RTS;
 464                 rts = 1;
 465         }
 466         if (set & TIOCM_DTR) {
 467                 control_state |= TIOCM_DTR;
 468                 dtr = 1;
 469         }
 470         if (clear & TIOCM_RTS) {
 471                 control_state &= ~TIOCM_RTS;
 472                 rts = 0;
 473         }
 474         if (clear & TIOCM_DTR) {
 475                 control_state &= ~TIOCM_DTR;
 476                 dtr = 0;
 477         }
 478
 479         priv->control_state = control_state;
 480         spin_unlock_irqrestore(&priv->lock, flags);
 481
 482         retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts);
 483         if (retval < 0) {
 484                 dev_err(&port->dev, "Set RTS error %d\n", retval);
 485                 goto exit;
 486         }
 487
 488         retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr);
 489         if (retval < 0) {
 490                 dev_err(&port->dev, "Set DTR error %d\n", retval);
 491                 goto exit;
 492         }
 493 exit:
 494         return retval;
 495 }
 496
 497 module_usb_serial_driver(serial_drivers, id_table);
 498
 499 MODULE_AUTHOR(DRIVER_AUTHOR);
 500 MODULE_DESCRIPTION(DRIVER_DESC);
 501 MODULE_LICENSE("GPL");