drivers/usb/serial/digi_acceleport.c

   1 /*
   2 *  Digi AccelePort USB-4 and USB-2 Serial Converters
   3 *
   4 *  Copyright 2000 by Digi International
   5 *
   6 *  This program is free software; you can redistribute it and/or modify
   7 *  it under the terms of the GNU General Public License as published by
   8 *  the Free Software Foundation; either version 2 of the License, or
   9 *  (at your option) any later version.
  10 *
  11 *  Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
  12 *  usb-serial driver.
  13 *
  14 *  Peter Berger (pberger@brimson.com)
  15 *  Al Borchers (borchers@steinerpoint.com)
  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/workqueue.h>
  28 #include <linux/uaccess.h>
  29 #include <linux/usb.h>
  30 #include <linux/wait.h>
  31 #include <linux/usb/serial.h>
  32
  33 /* Defines */
  34
  35 /*
  36  * Version Information
  37  */
  38 #define DRIVER_VERSION "v1.80.1.2"
  39 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
  40 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
  41
  42 /* port output buffer length -- must be <= transfer buffer length - 2 */
  43 /* so we can be sure to send the full buffer in one urb */
  44 #define DIGI_OUT_BUF_SIZE               8
  45
  46 /* port input buffer length -- must be >= transfer buffer length - 3 */
  47 /* so we can be sure to hold at least one full buffer from one urb */
  48 #define DIGI_IN_BUF_SIZE                64
  49
  50 /* retry timeout while sleeping */
  51 #define DIGI_RETRY_TIMEOUT              (HZ/10)
  52
  53 /* timeout while waiting for tty output to drain in close */
  54 /* this delay is used twice in close, so the total delay could */
  55 /* be twice this value */
  56 #define DIGI_CLOSE_TIMEOUT              (5*HZ)
  57
  58
  59 /* AccelePort USB Defines */
  60
  61 /* ids */
  62 #define DIGI_VENDOR_ID                  0x05c5
  63 #define DIGI_2_ID                       0x0002  /* USB-2 */
  64 #define DIGI_4_ID                       0x0004  /* USB-4 */
  65
  66 /* commands
  67  * "INB": can be used on the in-band endpoint
  68  * "OOB": can be used on the out-of-band endpoint
  69  */
  70 #define DIGI_CMD_SET_BAUD_RATE                  0       /* INB, OOB */
  71 #define DIGI_CMD_SET_WORD_SIZE                  1       /* INB, OOB */
  72 #define DIGI_CMD_SET_PARITY                     2       /* INB, OOB */
  73 #define DIGI_CMD_SET_STOP_BITS                  3       /* INB, OOB */
  74 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL         4       /* INB, OOB */
  75 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL        5       /* INB, OOB */
  76 #define DIGI_CMD_SET_DTR_SIGNAL                 6       /* INB, OOB */
  77 #define DIGI_CMD_SET_RTS_SIGNAL                 7       /* INB, OOB */
  78 #define DIGI_CMD_READ_INPUT_SIGNALS             8       /*      OOB */
  79 #define DIGI_CMD_IFLUSH_FIFO                    9       /*      OOB */
  80 #define DIGI_CMD_RECEIVE_ENABLE                 10      /* INB, OOB */
  81 #define DIGI_CMD_BREAK_CONTROL                  11      /* INB, OOB */
  82 #define DIGI_CMD_LOCAL_LOOPBACK                 12      /* INB, OOB */
  83 #define DIGI_CMD_TRANSMIT_IDLE                  13      /* INB, OOB */
  84 #define DIGI_CMD_READ_UART_REGISTER             14      /*      OOB */
  85 #define DIGI_CMD_WRITE_UART_REGISTER            15      /* INB, OOB */
  86 #define DIGI_CMD_AND_UART_REGISTER              16      /* INB, OOB */
  87 #define DIGI_CMD_OR_UART_REGISTER               17      /* INB, OOB */
  88 #define DIGI_CMD_SEND_DATA                      18      /* INB      */
  89 #define DIGI_CMD_RECEIVE_DATA                   19      /* INB      */
  90 #define DIGI_CMD_RECEIVE_DISABLE                20      /* INB      */
  91 #define DIGI_CMD_GET_PORT_TYPE                  21      /*      OOB */
  92
  93 /* baud rates */
  94 #define DIGI_BAUD_50                            0
  95 #define DIGI_BAUD_75                            1
  96 #define DIGI_BAUD_110                           2
  97 #define DIGI_BAUD_150                           3
  98 #define DIGI_BAUD_200                           4
  99 #define DIGI_BAUD_300                           5
 100 #define DIGI_BAUD_600                           6
 101 #define DIGI_BAUD_1200                          7
 102 #define DIGI_BAUD_1800                          8
 103 #define DIGI_BAUD_2400                          9
 104 #define DIGI_BAUD_4800                          10
 105 #define DIGI_BAUD_7200                          11
 106 #define DIGI_BAUD_9600                          12
 107 #define DIGI_BAUD_14400                         13
 108 #define DIGI_BAUD_19200                         14
 109 #define DIGI_BAUD_28800                         15
 110 #define DIGI_BAUD_38400                         16
 111 #define DIGI_BAUD_57600                         17
 112 #define DIGI_BAUD_76800                         18
 113 #define DIGI_BAUD_115200                        19
 114 #define DIGI_BAUD_153600                        20
 115 #define DIGI_BAUD_230400                        21
 116 #define DIGI_BAUD_460800                        22
 117
 118 /* arguments */
 119 #define DIGI_WORD_SIZE_5                        0
 120 #define DIGI_WORD_SIZE_6                        1
 121 #define DIGI_WORD_SIZE_7                        2
 122 #define DIGI_WORD_SIZE_8                        3
 123
 124 #define DIGI_PARITY_NONE                        0
 125 #define DIGI_PARITY_ODD                         1
 126 #define DIGI_PARITY_EVEN                        2
 127 #define DIGI_PARITY_MARK                        3
 128 #define DIGI_PARITY_SPACE                       4
 129
 130 #define DIGI_STOP_BITS_1                        0
 131 #define DIGI_STOP_BITS_2                        1
 132
 133 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF        1
 134 #define DIGI_INPUT_FLOW_CONTROL_RTS             2
 135 #define DIGI_INPUT_FLOW_CONTROL_DTR             4
 136
 137 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF       1
 138 #define DIGI_OUTPUT_FLOW_CONTROL_CTS            2
 139 #define DIGI_OUTPUT_FLOW_CONTROL_DSR            4
 140
 141 #define DIGI_DTR_INACTIVE                       0
 142 #define DIGI_DTR_ACTIVE                         1
 143 #define DIGI_DTR_INPUT_FLOW_CONTROL             2
 144
 145 #define DIGI_RTS_INACTIVE                       0
 146 #define DIGI_RTS_ACTIVE                         1
 147 #define DIGI_RTS_INPUT_FLOW_CONTROL             2
 148 #define DIGI_RTS_TOGGLE                         3
 149
 150 #define DIGI_FLUSH_TX                           1
 151 #define DIGI_FLUSH_RX                           2
 152 #define DIGI_RESUME_TX                          4 /* clears xoff condition */
 153
 154 #define DIGI_TRANSMIT_NOT_IDLE                  0
 155 #define DIGI_TRANSMIT_IDLE                      1
 156
 157 #define DIGI_DISABLE                            0
 158 #define DIGI_ENABLE                             1
 159
 160 #define DIGI_DEASSERT                           0
 161 #define DIGI_ASSERT                             1
 162
 163 /* in band status codes */
 164 #define DIGI_OVERRUN_ERROR                      4
 165 #define DIGI_PARITY_ERROR                       8
 166 #define DIGI_FRAMING_ERROR                      16
 167 #define DIGI_BREAK_ERROR                        32
 168
 169 /* out of band status */
 170 #define DIGI_NO_ERROR                           0
 171 #define DIGI_BAD_FIRST_PARAMETER                1
 172 #define DIGI_BAD_SECOND_PARAMETER               2
 173 #define DIGI_INVALID_LINE                       3
 174 #define DIGI_INVALID_OPCODE                     4
 175
 176 /* input signals */
 177 #define DIGI_READ_INPUT_SIGNALS_SLOT            1
 178 #define DIGI_READ_INPUT_SIGNALS_ERR             2
 179 #define DIGI_READ_INPUT_SIGNALS_BUSY            4
 180 #define DIGI_READ_INPUT_SIGNALS_PE              8
 181 #define DIGI_READ_INPUT_SIGNALS_CTS             16
 182 #define DIGI_READ_INPUT_SIGNALS_DSR             32
 183 #define DIGI_READ_INPUT_SIGNALS_RI              64
 184 #define DIGI_READ_INPUT_SIGNALS_DCD             128
 185
 186
 187 /* Structures */
 188
 189 struct digi_serial {
 190         spinlock_t ds_serial_lock;
 191         struct usb_serial_port *ds_oob_port;    /* out-of-band port */
 192         int ds_oob_port_num;                    /* index of out-of-band port */
 193         int ds_device_started;
 194 };
 195
 196 struct digi_port {
 197         spinlock_t dp_port_lock;
 198         int dp_port_num;
 199         int dp_out_buf_len;
 200         unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
 201         int dp_write_urb_in_use;
 202         unsigned int dp_modem_signals;
 203         wait_queue_head_t dp_modem_change_wait;
 204         int dp_transmit_idle;
 205         wait_queue_head_t dp_transmit_idle_wait;
 206         int dp_throttled;
 207         int dp_throttle_restart;
 208         wait_queue_head_t dp_flush_wait;
 209         wait_queue_head_t dp_close_wait;        /* wait queue for close */
 210         struct work_struct dp_wakeup_work;
 211         struct usb_serial_port *dp_port;
 212 };
 213
 214
 215 /* Local Function Declarations */
 216
 217 static void digi_wakeup_write(struct usb_serial_port *port);
 218 static void digi_wakeup_write_lock(struct work_struct *work);
 219 static int digi_write_oob_command(struct usb_serial_port *port,
 220         unsigned char *buf, int count, int interruptible);
 221 static int digi_write_inb_command(struct usb_serial_port *port,
 222         unsigned char *buf, int count, unsigned long timeout);
 223 static int digi_set_modem_signals(struct usb_serial_port *port,
 224         unsigned int modem_signals, int interruptible);
 225 static int digi_transmit_idle(struct usb_serial_port *port,
 226         unsigned long timeout);
 227 static void digi_rx_throttle(struct tty_struct *tty);
 228 static void digi_rx_unthrottle(struct tty_struct *tty);
 229 static void digi_set_termios(struct tty_struct *tty,
 230                 struct usb_serial_port *port, struct ktermios *old_termios);
 231 static void digi_break_ctl(struct tty_struct *tty, int break_state);
 232 static int digi_tiocmget(struct tty_struct *tty);
 233 static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
 234                 unsigned int clear);
 235 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
 236                 const unsigned char *buf, int count);
 237 static void digi_write_bulk_callback(struct urb *urb);
 238 static int digi_write_room(struct tty_struct *tty);
 239 static int digi_chars_in_buffer(struct tty_struct *tty);
 240 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
 241 static void digi_close(struct usb_serial_port *port);
 242 static void digi_dtr_rts(struct usb_serial_port *port, int on);
 243 static int digi_startup_device(struct usb_serial *serial);
 244 static int digi_startup(struct usb_serial *serial);
 245 static void digi_disconnect(struct usb_serial *serial);
 246 static void digi_release(struct usb_serial *serial);
 247 static void digi_read_bulk_callback(struct urb *urb);
 248 static int digi_read_inb_callback(struct urb *urb);
 249 static int digi_read_oob_callback(struct urb *urb);
 250
 251
 252 /* Statics */
 253
 254 static int debug;
 255
 256 static const struct usb_device_id id_table_combined[] = {
 257         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
 258         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
 259         { }                                             /* Terminating entry */
 260 };
 261
 262 static const struct usb_device_id id_table_2[] = {
 263         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
 264         { }                                             /* Terminating entry */
 265 };
 266
 267 static const struct usb_device_id id_table_4[] = {
 268         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
 269         { }                                             /* Terminating entry */
 270 };
 271
 272 MODULE_DEVICE_TABLE(usb, id_table_combined);
 273
 274 static struct usb_driver digi_driver = {
 275         .name =         "digi_acceleport",
 276         .probe =        usb_serial_probe,
 277         .disconnect =   usb_serial_disconnect,
 278         .id_table =     id_table_combined,
 279         .no_dynamic_id =        1,
 280 };
 281
 282
 283 /* device info needed for the Digi serial converter */
 284
 285 static struct usb_serial_driver digi_acceleport_2_device = {
 286         .driver = {
 287                 .owner =                THIS_MODULE,
 288                 .name =                 "digi_2",
 289         },
 290         .description =                  "Digi 2 port USB adapter",
 291         .usb_driver =                   &digi_driver,
 292         .id_table =                     id_table_2,
 293         .num_ports =                    3,
 294         .open =                         digi_open,
 295         .close =                        digi_close,
 296         .dtr_rts =                      digi_dtr_rts,
 297         .write =                        digi_write,
 298         .write_room =                   digi_write_room,
 299         .write_bulk_callback =          digi_write_bulk_callback,
 300         .read_bulk_callback =           digi_read_bulk_callback,
 301         .chars_in_buffer =              digi_chars_in_buffer,
 302         .throttle =                     digi_rx_throttle,
 303         .unthrottle =                   digi_rx_unthrottle,
 304         .set_termios =                  digi_set_termios,
 305         .break_ctl =                    digi_break_ctl,
 306         .tiocmget =                     digi_tiocmget,
 307         .tiocmset =                     digi_tiocmset,
 308         .attach =                       digi_startup,
 309         .disconnect =                   digi_disconnect,
 310         .release =                      digi_release,
 311 };
 312
 313 static struct usb_serial_driver digi_acceleport_4_device = {
 314         .driver = {
 315                 .owner =                THIS_MODULE,
 316                 .name =                 "digi_4",
 317         },
 318         .description =                  "Digi 4 port USB adapter",
 319         .usb_driver =                   &digi_driver,
 320         .id_table =                     id_table_4,
 321         .num_ports =                    4,
 322         .open =                         digi_open,
 323         .close =                        digi_close,
 324         .write =                        digi_write,
 325         .write_room =                   digi_write_room,
 326         .write_bulk_callback =          digi_write_bulk_callback,
 327         .read_bulk_callback =           digi_read_bulk_callback,
 328         .chars_in_buffer =              digi_chars_in_buffer,
 329         .throttle =                     digi_rx_throttle,
 330         .unthrottle =                   digi_rx_unthrottle,
 331         .set_termios =                  digi_set_termios,
 332         .break_ctl =                    digi_break_ctl,
 333         .tiocmget =                     digi_tiocmget,
 334         .tiocmset =                     digi_tiocmset,
 335         .attach =                       digi_startup,
 336         .disconnect =                   digi_disconnect,
 337         .release =                      digi_release,
 338 };
 339
 340
 341 /* Functions */
 342
 343 /*
 344  *  Cond Wait Interruptible Timeout Irqrestore
 345  *
 346  *  Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
 347  *  so that wake ups are not lost if they occur between the unlock
 348  *  and the sleep.  In other words, spin_unlock_irqrestore and
 349  *  interruptible_sleep_on_timeout are "atomic" with respect to
 350  *  wake ups.  This is used to implement condition variables.
 351  *
 352  *  interruptible_sleep_on_timeout is deprecated and has been replaced
 353  *  with the equivalent code.
 354  */
 355
 356 static long cond_wait_interruptible_timeout_irqrestore(
 357         wait_queue_head_t *q, long timeout,
 358         spinlock_t *lock, unsigned long flags)
 359 __releases(lock)
 360 {
 361         DEFINE_WAIT(wait);
 362
 363         prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
 364         spin_unlock_irqrestore(lock, flags);
 365         timeout = schedule_timeout(timeout);
 366         finish_wait(q, &wait);
 367
 368         return timeout;
 369 }
 370
 371
 372 /*
 373  *  Digi Wakeup Write
 374  *
 375  *  Wake up port, line discipline, and tty processes sleeping
 376  *  on writes.
 377  */
 378
 379 static void digi_wakeup_write_lock(struct work_struct *work)
 380 {
 381         struct digi_port *priv =
 382                         container_of(work, struct digi_port, dp_wakeup_work);
 383         struct usb_serial_port *port = priv->dp_port;
 384         unsigned long flags;
 385
 386         spin_lock_irqsave(&priv->dp_port_lock, flags);
 387         digi_wakeup_write(port);
 388         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 389 }
 390
 391 static void digi_wakeup_write(struct usb_serial_port *port)
 392 {
 393         struct tty_struct *tty = tty_port_tty_get(&port->port);
 394         if (tty) {
 395                 tty_wakeup(tty);
 396                 tty_kref_put(tty);
 397         }
 398 }
 399
 400
 401 /*
 402  *  Digi Write OOB Command
 403  *
 404  *  Write commands on the out of band port.  Commands are 4
 405  *  bytes each, multiple commands can be sent at once, and
 406  *  no command will be split across USB packets.  Returns 0
 407  *  if successful, -EINTR if interrupted while sleeping and
 408  *  the interruptible flag is true, or a negative error
 409  *  returned by usb_submit_urb.
 410  */
 411
 412 static int digi_write_oob_command(struct usb_serial_port *port,
 413         unsigned char *buf, int count, int interruptible)
 414 {
 415
 416         int ret = 0;
 417         int len;
 418         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 419         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 420         unsigned long flags = 0;
 421
 422         dbg("digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count);
 423
 424         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 425         while (count > 0) {
 426                 while (oob_priv->dp_write_urb_in_use) {
 427                         cond_wait_interruptible_timeout_irqrestore(
 428                                 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
 429                                 &oob_priv->dp_port_lock, flags);
 430                         if (interruptible && signal_pending(current))
 431                                 return -EINTR;
 432                         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 433                 }
 434
 435                 /* len must be a multiple of 4, so commands are not split */
 436                 len = min(count, oob_port->bulk_out_size);
 437                 if (len > 4)
 438                         len &= ~3;
 439                 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
 440                 oob_port->write_urb->transfer_buffer_length = len;
 441                 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
 442                 if (ret == 0) {
 443                         oob_priv->dp_write_urb_in_use = 1;
 444                         count -= len;
 445                         buf += len;
 446                 }
 447         }
 448         spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
 449         if (ret)
 450                 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
 451                         __func__, ret);
 452         return ret;
 453
 454 }
 455
 456
 457 /*
 458  *  Digi Write In Band Command
 459  *
 460  *  Write commands on the given port.  Commands are 4
 461  *  bytes each, multiple commands can be sent at once, and
 462  *  no command will be split across USB packets.  If timeout
 463  *  is non-zero, write in band command will return after
 464  *  waiting unsuccessfully for the URB status to clear for
 465  *  timeout ticks.  Returns 0 if successful, or a negative
 466  *  error returned by digi_write.
 467  */
 468
 469 static int digi_write_inb_command(struct usb_serial_port *port,
 470         unsigned char *buf, int count, unsigned long timeout)
 471 {
 472         int ret = 0;
 473         int len;
 474         struct digi_port *priv = usb_get_serial_port_data(port);
 475         unsigned char *data = port->write_urb->transfer_buffer;
 476         unsigned long flags = 0;
 477
 478         dbg("digi_write_inb_command: TOP: port=%d, count=%d",
 479                 priv->dp_port_num, count);
 480
 481         if (timeout)
 482                 timeout += jiffies;
 483         else
 484                 timeout = ULONG_MAX;
 485
 486         spin_lock_irqsave(&priv->dp_port_lock, flags);
 487         while (count > 0 && ret == 0) {
 488                 while (priv->dp_write_urb_in_use &&
 489                        time_before(jiffies, timeout)) {
 490                         cond_wait_interruptible_timeout_irqrestore(
 491                                 &port->write_wait, DIGI_RETRY_TIMEOUT,
 492                                 &priv->dp_port_lock, flags);
 493                         if (signal_pending(current))
 494                                 return -EINTR;
 495                         spin_lock_irqsave(&priv->dp_port_lock, flags);
 496                 }
 497
 498                 /* len must be a multiple of 4 and small enough to */
 499                 /* guarantee the write will send buffered data first, */
 500                 /* so commands are in order with data and not split */
 501                 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
 502                 if (len > 4)
 503                         len &= ~3;
 504
 505                 /* write any buffered data first */
 506                 if (priv->dp_out_buf_len > 0) {
 507                         data[0] = DIGI_CMD_SEND_DATA;
 508                         data[1] = priv->dp_out_buf_len;
 509                         memcpy(data + 2, priv->dp_out_buf,
 510                                 priv->dp_out_buf_len);
 511                         memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
 512                         port->write_urb->transfer_buffer_length
 513                                 = priv->dp_out_buf_len + 2 + len;
 514                 } else {
 515                         memcpy(data, buf, len);
 516                         port->write_urb->transfer_buffer_length = len;
 517                 }
 518
 519                 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 520                 if (ret == 0) {
 521                         priv->dp_write_urb_in_use = 1;
 522                         priv->dp_out_buf_len = 0;
 523                         count -= len;
 524                         buf += len;
 525                 }
 526
 527         }
 528         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 529
 530         if (ret)
 531                 dev_err(&port->dev,
 532                         "%s: usb_submit_urb failed, ret=%d, port=%d\n",
 533                         __func__, ret, priv->dp_port_num);
 534         return ret;
 535 }
 536
 537
 538 /*
 539  *  Digi Set Modem Signals
 540  *
 541  *  Sets or clears DTR and RTS on the port, according to the
 542  *  modem_signals argument.  Use TIOCM_DTR and TIOCM_RTS flags
 543  *  for the modem_signals argument.  Returns 0 if successful,
 544  *  -EINTR if interrupted while sleeping, or a non-zero error
 545  *  returned by usb_submit_urb.
 546  */
 547
 548 static int digi_set_modem_signals(struct usb_serial_port *port,
 549         unsigned int modem_signals, int interruptible)
 550 {
 551
 552         int ret;
 553         struct digi_port *port_priv = usb_get_serial_port_data(port);
 554         struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 555         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 556         unsigned char *data = oob_port->write_urb->transfer_buffer;
 557         unsigned long flags = 0;
 558
 559
 560         dbg("digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
 561                 port_priv->dp_port_num, modem_signals);
 562
 563         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 564         spin_lock(&port_priv->dp_port_lock);
 565
 566         while (oob_priv->dp_write_urb_in_use) {
 567                 spin_unlock(&port_priv->dp_port_lock);
 568                 cond_wait_interruptible_timeout_irqrestore(
 569                         &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
 570                         &oob_priv->dp_port_lock, flags);
 571                 if (interruptible && signal_pending(current))
 572                         return -EINTR;
 573                 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 574                 spin_lock(&port_priv->dp_port_lock);
 575         }
 576         data[0] = DIGI_CMD_SET_DTR_SIGNAL;
 577         data[1] = port_priv->dp_port_num;
 578         data[2] = (modem_signals & TIOCM_DTR) ?
 579                                         DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
 580         data[3] = 0;
 581         data[4] = DIGI_CMD_SET_RTS_SIGNAL;
 582         data[5] = port_priv->dp_port_num;
 583         data[6] = (modem_signals & TIOCM_RTS) ?
 584                                         DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
 585         data[7] = 0;
 586
 587         oob_port->write_urb->transfer_buffer_length = 8;
 588
 589         ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
 590         if (ret == 0) {
 591                 oob_priv->dp_write_urb_in_use = 1;
 592                 port_priv->dp_modem_signals =
 593                         (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
 594                         | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
 595         }
 596         spin_unlock(&port_priv->dp_port_lock);
 597         spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
 598         if (ret)
 599                 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
 600                         __func__, ret);
 601         return ret;
 602 }
 603
 604 /*
 605  *  Digi Transmit Idle
 606  *
 607  *  Digi transmit idle waits, up to timeout ticks, for the transmitter
 608  *  to go idle.  It returns 0 if successful or a negative error.
 609  *
 610  *  There are race conditions here if more than one process is calling
 611  *  digi_transmit_idle on the same port at the same time.  However, this
 612  *  is only called from close, and only one process can be in close on a
 613  *  port at a time, so its ok.
 614  */
 615
 616 static int digi_transmit_idle(struct usb_serial_port *port,
 617         unsigned long timeout)
 618 {
 619         int ret;
 620         unsigned char buf[2];
 621         struct digi_port *priv = usb_get_serial_port_data(port);
 622         unsigned long flags = 0;
 623
 624         spin_lock_irqsave(&priv->dp_port_lock, flags);
 625         priv->dp_transmit_idle = 0;
 626         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 627
 628         buf[0] = DIGI_CMD_TRANSMIT_IDLE;
 629         buf[1] = 0;
 630
 631         timeout += jiffies;
 632
 633         ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
 634         if (ret != 0)
 635                 return ret;
 636
 637         spin_lock_irqsave(&priv->dp_port_lock, flags);
 638
 639         while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
 640                 cond_wait_interruptible_timeout_irqrestore(
 641                         &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
 642                         &priv->dp_port_lock, flags);
 643                 if (signal_pending(current))
 644                         return -EINTR;
 645                 spin_lock_irqsave(&priv->dp_port_lock, flags);
 646         }
 647         priv->dp_transmit_idle = 0;
 648         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 649         return 0;
 650
 651 }
 652
 653
 654 static void digi_rx_throttle(struct tty_struct *tty)
 655 {
 656         unsigned long flags;
 657         struct usb_serial_port *port = tty->driver_data;
 658         struct digi_port *priv = usb_get_serial_port_data(port);
 659
 660
 661         dbg("digi_rx_throttle: TOP: port=%d", priv->dp_port_num);
 662
 663         /* stop receiving characters by not resubmitting the read urb */
 664         spin_lock_irqsave(&priv->dp_port_lock, flags);
 665         priv->dp_throttled = 1;
 666         priv->dp_throttle_restart = 0;
 667         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 668 }
 669
 670
 671 static void digi_rx_unthrottle(struct tty_struct *tty)
 672 {
 673         int ret = 0;
 674         unsigned long flags;
 675         struct usb_serial_port *port = tty->driver_data;
 676         struct digi_port *priv = usb_get_serial_port_data(port);
 677
 678         dbg("digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num);
 679
 680         spin_lock_irqsave(&priv->dp_port_lock, flags);
 681
 682         /* restart read chain */
 683         if (priv->dp_throttle_restart)
 684                 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 685
 686         /* turn throttle off */
 687         priv->dp_throttled = 0;
 688         priv->dp_throttle_restart = 0;
 689
 690         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 691
 692         if (ret)
 693                 dev_err(&port->dev,
 694                         "%s: usb_submit_urb failed, ret=%d, port=%d\n",
 695                         __func__, ret, priv->dp_port_num);
 696 }
 697
 698
 699 static void digi_set_termios(struct tty_struct *tty,
 700                 struct usb_serial_port *port, struct ktermios *old_termios)
 701 {
 702         struct digi_port *priv = usb_get_serial_port_data(port);
 703         unsigned int iflag = tty->termios->c_iflag;
 704         unsigned int cflag = tty->termios->c_cflag;
 705         unsigned int old_iflag = old_termios->c_iflag;
 706         unsigned int old_cflag = old_termios->c_cflag;
 707         unsigned char buf[32];
 708         unsigned int modem_signals;
 709         int arg, ret;
 710         int i = 0;
 711         speed_t baud;
 712
 713         dbg("digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x", priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
 714
 715         /* set baud rate */
 716         baud = tty_get_baud_rate(tty);
 717         if (baud != tty_termios_baud_rate(old_termios)) {
 718                 arg = -1;
 719
 720                 /* reassert DTR and (maybe) RTS on transition from B0 */
 721                 if ((old_cflag&CBAUD) == B0) {
 722                         /* don't set RTS if using hardware flow control */
 723                         /* and throttling input */
 724                         modem_signals = TIOCM_DTR;
 725                         if (!(tty->termios->c_cflag & CRTSCTS) ||
 726                             !test_bit(TTY_THROTTLED, &tty->flags))
 727                                 modem_signals |= TIOCM_RTS;
 728                         digi_set_modem_signals(port, modem_signals, 1);
 729                 }
 730                 switch (baud) {
 731                 /* drop DTR and RTS on transition to B0 */
 732                 case 0: digi_set_modem_signals(port, 0, 1); break;
 733                 case 50: arg = DIGI_BAUD_50; break;
 734                 case 75: arg = DIGI_BAUD_75; break;
 735                 case 110: arg = DIGI_BAUD_110; break;
 736                 case 150: arg = DIGI_BAUD_150; break;
 737                 case 200: arg = DIGI_BAUD_200; break;
 738                 case 300: arg = DIGI_BAUD_300; break;
 739                 case 600: arg = DIGI_BAUD_600; break;
 740                 case 1200: arg = DIGI_BAUD_1200; break;
 741                 case 1800: arg = DIGI_BAUD_1800; break;
 742                 case 2400: arg = DIGI_BAUD_2400; break;
 743                 case 4800: arg = DIGI_BAUD_4800; break;
 744                 case 9600: arg = DIGI_BAUD_9600; break;
 745                 case 19200: arg = DIGI_BAUD_19200; break;
 746                 case 38400: arg = DIGI_BAUD_38400; break;
 747                 case 57600: arg = DIGI_BAUD_57600; break;
 748                 case 115200: arg = DIGI_BAUD_115200; break;
 749                 case 230400: arg = DIGI_BAUD_230400; break;
 750                 case 460800: arg = DIGI_BAUD_460800; break;
 751                 default:
 752                         arg = DIGI_BAUD_9600;
 753                         baud = 9600;
 754                         break;
 755                 }
 756                 if (arg != -1) {
 757                         buf[i++] = DIGI_CMD_SET_BAUD_RATE;
 758                         buf[i++] = priv->dp_port_num;
 759                         buf[i++] = arg;
 760                         buf[i++] = 0;
 761                 }
 762         }
 763         /* set parity */
 764         tty->termios->c_cflag &= ~CMSPAR;
 765
 766         if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
 767                 if (cflag&PARENB) {
 768                         if (cflag&PARODD)
 769                                 arg = DIGI_PARITY_ODD;
 770                         else
 771                                 arg = DIGI_PARITY_EVEN;
 772                 } else {
 773                         arg = DIGI_PARITY_NONE;
 774                 }
 775                 buf[i++] = DIGI_CMD_SET_PARITY;
 776                 buf[i++] = priv->dp_port_num;
 777                 buf[i++] = arg;
 778                 buf[i++] = 0;
 779         }
 780         /* set word size */
 781         if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
 782                 arg = -1;
 783                 switch (cflag&CSIZE) {
 784                 case CS5: arg = DIGI_WORD_SIZE_5; break;
 785                 case CS6: arg = DIGI_WORD_SIZE_6; break;
 786                 case CS7: arg = DIGI_WORD_SIZE_7; break;
 787                 case CS8: arg = DIGI_WORD_SIZE_8; break;
 788                 default:
 789                         dbg("digi_set_termios: can't handle word size %d",
 790                                 (cflag&CSIZE));
 791                         break;
 792                 }
 793
 794                 if (arg != -1) {
 795                         buf[i++] = DIGI_CMD_SET_WORD_SIZE;
 796                         buf[i++] = priv->dp_port_num;
 797                         buf[i++] = arg;
 798                         buf[i++] = 0;
 799                 }
 800
 801         }
 802
 803         /* set stop bits */
 804         if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
 805
 806                 if ((cflag&CSTOPB))
 807                         arg = DIGI_STOP_BITS_2;
 808                 else
 809                         arg = DIGI_STOP_BITS_1;
 810
 811                 buf[i++] = DIGI_CMD_SET_STOP_BITS;
 812                 buf[i++] = priv->dp_port_num;
 813                 buf[i++] = arg;
 814                 buf[i++] = 0;
 815
 816         }
 817
 818         /* set input flow control */
 819         if ((iflag&IXOFF) != (old_iflag&IXOFF)
 820             || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
 821                 arg = 0;
 822                 if (iflag&IXOFF)
 823                         arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
 824                 else
 825                         arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
 826
 827                 if (cflag&CRTSCTS) {
 828                         arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
 829
 830                         /* On USB-4 it is necessary to assert RTS prior */
 831                         /* to selecting RTS input flow control.  */
 832                         buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
 833                         buf[i++] = priv->dp_port_num;
 834                         buf[i++] = DIGI_RTS_ACTIVE;
 835                         buf[i++] = 0;
 836
 837                 } else {
 838                         arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
 839                 }
 840                 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
 841                 buf[i++] = priv->dp_port_num;
 842                 buf[i++] = arg;
 843                 buf[i++] = 0;
 844         }
 845
 846         /* set output flow control */
 847         if ((iflag & IXON) != (old_iflag & IXON)
 848             || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 849                 arg = 0;
 850                 if (iflag & IXON)
 851                         arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
 852                 else
 853                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
 854
 855                 if (cflag & CRTSCTS) {
 856                         arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
 857                 } else {
 858                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
 859                         tty->hw_stopped = 0;
 860                 }
 861
 862                 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
 863                 buf[i++] = priv->dp_port_num;
 864                 buf[i++] = arg;
 865                 buf[i++] = 0;
 866         }
 867
 868         /* set receive enable/disable */
 869         if ((cflag & CREAD) != (old_cflag & CREAD)) {
 870                 if (cflag & CREAD)
 871                         arg = DIGI_ENABLE;
 872                 else
 873                         arg = DIGI_DISABLE;
 874
 875                 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
 876                 buf[i++] = priv->dp_port_num;
 877                 buf[i++] = arg;
 878                 buf[i++] = 0;
 879         }
 880         ret = digi_write_oob_command(port, buf, i, 1);
 881         if (ret != 0)
 882                 dbg("digi_set_termios: write oob failed, ret=%d", ret);
 883         tty_encode_baud_rate(tty, baud, baud);
 884 }
 885
 886
 887 static void digi_break_ctl(struct tty_struct *tty, int break_state)
 888 {
 889         struct usb_serial_port *port = tty->driver_data;
 890         unsigned char buf[4];
 891
 892         buf[0] = DIGI_CMD_BREAK_CONTROL;
 893         buf[1] = 2;                             /* length */
 894         buf[2] = break_state ? 1 : 0;
 895         buf[3] = 0;                             /* pad */
 896         digi_write_inb_command(port, buf, 4, 0);
 897 }
 898
 899
 900 static int digi_tiocmget(struct tty_struct *tty)
 901 {
 902         struct usb_serial_port *port = tty->driver_data;
 903         struct digi_port *priv = usb_get_serial_port_data(port);
 904         unsigned int val;
 905         unsigned long flags;
 906
 907         dbg("%s: TOP: port=%d", __func__, priv->dp_port_num);
 908
 909         spin_lock_irqsave(&priv->dp_port_lock, flags);
 910         val = priv->dp_modem_signals;
 911         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 912         return val;
 913 }
 914
 915
 916 static int digi_tiocmset(struct tty_struct *tty,
 917                                         unsigned int set, unsigned int clear)
 918 {
 919         struct usb_serial_port *port = tty->driver_data;
 920         struct digi_port *priv = usb_get_serial_port_data(port);
 921         unsigned int val;
 922         unsigned long flags;
 923
 924         dbg("%s: TOP: port=%d", __func__, priv->dp_port_num);
 925
 926         spin_lock_irqsave(&priv->dp_port_lock, flags);
 927         val = (priv->dp_modem_signals & ~clear) | set;
 928         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 929         return digi_set_modem_signals(port, val, 1);
 930 }
 931
 932
 933 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
 934                                         const unsigned char *buf, int count)
 935 {
 936
 937         int ret, data_len, new_len;
 938         struct digi_port *priv = usb_get_serial_port_data(port);
 939         unsigned char *data = port->write_urb->transfer_buffer;
 940         unsigned long flags = 0;
 941
 942         dbg("digi_write: TOP: port=%d, count=%d, in_interrupt=%ld",
 943                 priv->dp_port_num, count, in_interrupt());
 944
 945         /* copy user data (which can sleep) before getting spin lock */
 946         count = min(count, port->bulk_out_size-2);
 947         count = min(64, count);
 948
 949         /* be sure only one write proceeds at a time */
 950         /* there are races on the port private buffer */
 951         spin_lock_irqsave(&priv->dp_port_lock, flags);
 952
 953         /* wait for urb status clear to submit another urb */
 954         if (priv->dp_write_urb_in_use) {
 955                 /* buffer data if count is 1 (probably put_char) if possible */
 956                 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
 957                         priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
 958                         new_len = 1;
 959                 } else {
 960                         new_len = 0;
 961                 }
 962                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 963                 return new_len;
 964         }
 965
 966         /* allow space for any buffered data and for new data, up to */
 967         /* transfer buffer size - 2 (for command and length bytes) */
 968         new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
 969         data_len = new_len + priv->dp_out_buf_len;
 970
 971         if (data_len == 0) {
 972                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 973                 return 0;
 974         }
 975
 976         port->write_urb->transfer_buffer_length = data_len+2;
 977
 978         *data++ = DIGI_CMD_SEND_DATA;
 979         *data++ = data_len;
 980
 981         /* copy in buffered data first */
 982         memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
 983         data += priv->dp_out_buf_len;
 984
 985         /* copy in new data */
 986         memcpy(data, buf, new_len);
 987
 988         ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 989         if (ret == 0) {
 990                 priv->dp_write_urb_in_use = 1;
 991                 ret = new_len;
 992                 priv->dp_out_buf_len = 0;
 993         }
 994
 995         /* return length of new data written, or error */
 996         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 997         if (ret < 0)
 998                 dev_err(&port->dev,
 999                         "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1000                         __func__, ret, priv->dp_port_num);
1001         dbg("digi_write: returning %d", ret);
1002         return ret;
1003
1004 }
1005
1006 static void digi_write_bulk_callback(struct urb *urb)
1007 {
1008
1009         struct usb_serial_port *port = urb->context;
1010         struct usb_serial *serial;
1011         struct digi_port *priv;
1012         struct digi_serial *serial_priv;
1013         int ret = 0;
1014         int status = urb->status;
1015
1016         dbg("digi_write_bulk_callback: TOP, status=%d", status);
1017
1018         /* port and serial sanity check */
1019         if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
1020                 pr_err("%s: port or port->private is NULL, status=%d\n",
1021                         __func__, status);
1022                 return;
1023         }
1024         serial = port->serial;
1025         if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
1026                 dev_err(&port->dev,
1027                         "%s: serial or serial->private is NULL, status=%d\n",
1028                         __func__, status);
1029                 return;
1030         }
1031
1032         /* handle oob callback */
1033         if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1034                 dbg("digi_write_bulk_callback: oob callback");
1035                 spin_lock(&priv->dp_port_lock);
1036                 priv->dp_write_urb_in_use = 0;
1037                 wake_up_interruptible(&port->write_wait);
1038                 spin_unlock(&priv->dp_port_lock);
1039                 return;
1040         }
1041
1042         /* try to send any buffered data on this port */
1043         spin_lock(&priv->dp_port_lock);
1044         priv->dp_write_urb_in_use = 0;
1045         if (priv->dp_out_buf_len > 0) {
1046                 *((unsigned char *)(port->write_urb->transfer_buffer))
1047                         = (unsigned char)DIGI_CMD_SEND_DATA;
1048                 *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
1049                         = (unsigned char)priv->dp_out_buf_len;
1050                 port->write_urb->transfer_buffer_length =
1051                                                 priv->dp_out_buf_len + 2;
1052                 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1053                         priv->dp_out_buf_len);
1054                 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1055                 if (ret == 0) {
1056                         priv->dp_write_urb_in_use = 1;
1057                         priv->dp_out_buf_len = 0;
1058                 }
1059         }
1060         /* wake up processes sleeping on writes immediately */
1061         digi_wakeup_write(port);
1062         /* also queue up a wakeup at scheduler time, in case we */
1063         /* lost the race in write_chan(). */
1064         schedule_work(&priv->dp_wakeup_work);
1065
1066         spin_unlock(&priv->dp_port_lock);
1067         if (ret && ret != -EPERM)
1068                 dev_err(&port->dev,
1069                         "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1070                         __func__, ret, priv->dp_port_num);
1071 }
1072
1073 static int digi_write_room(struct tty_struct *tty)
1074 {
1075         struct usb_serial_port *port = tty->driver_data;
1076         struct digi_port *priv = usb_get_serial_port_data(port);
1077         int room;
1078         unsigned long flags = 0;
1079
1080         spin_lock_irqsave(&priv->dp_port_lock, flags);
1081
1082         if (priv->dp_write_urb_in_use)
1083                 room = 0;
1084         else
1085                 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1086
1087         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1088         dbg("digi_write_room: port=%d, room=%d", priv->dp_port_num, room);
1089         return room;
1090
1091 }
1092
1093 static int digi_chars_in_buffer(struct tty_struct *tty)
1094 {
1095         struct usb_serial_port *port = tty->driver_data;
1096         struct digi_port *priv = usb_get_serial_port_data(port);
1097
1098         if (priv->dp_write_urb_in_use) {
1099                 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1100                         priv->dp_port_num, port->bulk_out_size - 2);
1101                 /* return(port->bulk_out_size - 2); */
1102                 return 256;
1103         } else {
1104                 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1105                         priv->dp_port_num, priv->dp_out_buf_len);
1106                 return priv->dp_out_buf_len;
1107         }
1108
1109 }
1110
1111 static void digi_dtr_rts(struct usb_serial_port *port, int on)
1112 {
1113         /* Adjust DTR and RTS */
1114         digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
1115 }
1116
1117 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1118 {
1119         int ret;
1120         unsigned char buf[32];
1121         struct digi_port *priv = usb_get_serial_port_data(port);
1122         struct ktermios not_termios;
1123
1124         dbg("digi_open: TOP: port=%d", priv->dp_port_num);
1125
1126         /* be sure the device is started up */
1127         if (digi_startup_device(port->serial) != 0)
1128                 return -ENXIO;
1129
1130         /* read modem signals automatically whenever they change */
1131         buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1132         buf[1] = priv->dp_port_num;
1133         buf[2] = DIGI_ENABLE;
1134         buf[3] = 0;
1135
1136         /* flush fifos */
1137         buf[4] = DIGI_CMD_IFLUSH_FIFO;
1138         buf[5] = priv->dp_port_num;
1139         buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1140         buf[7] = 0;
1141
1142         ret = digi_write_oob_command(port, buf, 8, 1);
1143         if (ret != 0)
1144                 dbg("digi_open: write oob failed, ret=%d", ret);
1145
1146         /* set termios settings */
1147         if (tty) {
1148                 not_termios.c_cflag = ~tty->termios->c_cflag;
1149                 not_termios.c_iflag = ~tty->termios->c_iflag;
1150                 digi_set_termios(tty, port, &not_termios);
1151         }
1152         return 0;
1153 }
1154
1155
1156 static void digi_close(struct usb_serial_port *port)
1157 {
1158         DEFINE_WAIT(wait);
1159         int ret;
1160         unsigned char buf[32];
1161         struct digi_port *priv = usb_get_serial_port_data(port);
1162
1163         dbg("digi_close: TOP: port=%d", priv->dp_port_num);
1164
1165         mutex_lock(&port->serial->disc_mutex);
1166         /* if disconnected, just clear flags */
1167         if (port->serial->disconnected)
1168                 goto exit;
1169
1170         if (port->serial->dev) {
1171                 /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1172                 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1173
1174                 /* disable input flow control */
1175                 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1176                 buf[1] = priv->dp_port_num;
1177                 buf[2] = DIGI_DISABLE;
1178                 buf[3] = 0;
1179
1180                 /* disable output flow control */
1181                 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1182                 buf[5] = priv->dp_port_num;
1183                 buf[6] = DIGI_DISABLE;
1184                 buf[7] = 0;
1185
1186                 /* disable reading modem signals automatically */
1187                 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1188                 buf[9] = priv->dp_port_num;
1189                 buf[10] = DIGI_DISABLE;
1190                 buf[11] = 0;
1191
1192                 /* disable receive */
1193                 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1194                 buf[13] = priv->dp_port_num;
1195                 buf[14] = DIGI_DISABLE;
1196                 buf[15] = 0;
1197
1198                 /* flush fifos */
1199                 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1200                 buf[17] = priv->dp_port_num;
1201                 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1202                 buf[19] = 0;
1203
1204                 ret = digi_write_oob_command(port, buf, 20, 0);
1205                 if (ret != 0)
1206                         dbg("digi_close: write oob failed, ret=%d", ret);
1207
1208                 /* wait for final commands on oob port to complete */
1209                 prepare_to_wait(&priv->dp_flush_wait, &wait,
1210                                                         TASK_INTERRUPTIBLE);
1211                 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1212                 finish_wait(&priv->dp_flush_wait, &wait);
1213
1214                 /* shutdown any outstanding bulk writes */
1215                 usb_kill_urb(port->write_urb);
1216         }
1217 exit:
1218         spin_lock_irq(&priv->dp_port_lock);
1219         priv->dp_write_urb_in_use = 0;
1220         wake_up_interruptible(&priv->dp_close_wait);
1221         spin_unlock_irq(&priv->dp_port_lock);
1222         mutex_unlock(&port->serial->disc_mutex);
1223         dbg("digi_close: done");
1224 }
1225
1226
1227 /*
1228  *  Digi Startup Device
1229  *
1230  *  Starts reads on all ports.  Must be called AFTER startup, with
1231  *  urbs initialized.  Returns 0 if successful, non-zero error otherwise.
1232  */
1233
1234 static int digi_startup_device(struct usb_serial *serial)
1235 {
1236         int i, ret = 0;
1237         struct digi_serial *serial_priv = usb_get_serial_data(serial);
1238         struct usb_serial_port *port;
1239
1240         /* be sure this happens exactly once */
1241         spin_lock(&serial_priv->ds_serial_lock);
1242         if (serial_priv->ds_device_started) {
1243                 spin_unlock(&serial_priv->ds_serial_lock);
1244                 return 0;
1245         }
1246         serial_priv->ds_device_started = 1;
1247         spin_unlock(&serial_priv->ds_serial_lock);
1248
1249         /* start reading from each bulk in endpoint for the device */
1250         /* set USB_DISABLE_SPD flag for write bulk urbs */
1251         for (i = 0; i < serial->type->num_ports + 1; i++) {
1252                 port = serial->port[i];
1253                 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1254                 if (ret != 0) {
1255                         dev_err(&port->dev,
1256                                 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1257                                 __func__, ret, i);
1258                         break;
1259                 }
1260         }
1261         return ret;
1262 }
1263
1264
1265 static int digi_startup(struct usb_serial *serial)
1266 {
1267
1268         int i;
1269         struct digi_port *priv;
1270         struct digi_serial *serial_priv;
1271
1272         dbg("digi_startup: TOP");
1273
1274         /* allocate the private data structures for all ports */
1275         /* number of regular ports + 1 for the out-of-band port */
1276         for (i = 0; i < serial->type->num_ports + 1; i++) {
1277                 /* allocate port private structure */
1278                 priv = kmalloc(sizeof(struct digi_port), GFP_KERNEL);
1279                 if (priv == NULL) {
1280                         while (--i >= 0)
1281                                 kfree(usb_get_serial_port_data(serial->port[i]));
1282                         return 1;                       /* error */
1283                 }
1284
1285                 /* initialize port private structure */
1286                 spin_lock_init(&priv->dp_port_lock);
1287                 priv->dp_port_num = i;
1288                 priv->dp_out_buf_len = 0;
1289                 priv->dp_write_urb_in_use = 0;
1290                 priv->dp_modem_signals = 0;
1291                 init_waitqueue_head(&priv->dp_modem_change_wait);
1292                 priv->dp_transmit_idle = 0;
1293                 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1294                 priv->dp_throttled = 0;
1295                 priv->dp_throttle_restart = 0;
1296                 init_waitqueue_head(&priv->dp_flush_wait);
1297                 init_waitqueue_head(&priv->dp_close_wait);
1298                 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1299                 priv->dp_port = serial->port[i];
1300                 /* initialize write wait queue for this port */
1301                 init_waitqueue_head(&serial->port[i]->write_wait);
1302
1303                 usb_set_serial_port_data(serial->port[i], priv);
1304         }
1305
1306         /* allocate serial private structure */
1307         serial_priv = kmalloc(sizeof(struct digi_serial), GFP_KERNEL);
1308         if (serial_priv == NULL) {
1309                 for (i = 0; i < serial->type->num_ports + 1; i++)
1310                         kfree(usb_get_serial_port_data(serial->port[i]));
1311                 return 1;                       /* error */
1312         }
1313
1314         /* initialize serial private structure */
1315         spin_lock_init(&serial_priv->ds_serial_lock);
1316         serial_priv->ds_oob_port_num = serial->type->num_ports;
1317         serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1318         serial_priv->ds_device_started = 0;
1319         usb_set_serial_data(serial, serial_priv);
1320
1321         return 0;
1322 }
1323
1324
1325 static void digi_disconnect(struct usb_serial *serial)
1326 {
1327         int i;
1328         dbg("digi_disconnect: TOP, in_interrupt()=%ld", in_interrupt());
1329
1330         /* stop reads and writes on all ports */
1331         for (i = 0; i < serial->type->num_ports + 1; i++) {
1332                 usb_kill_urb(serial->port[i]->read_urb);
1333                 usb_kill_urb(serial->port[i]->write_urb);
1334         }
1335 }
1336
1337
1338 static void digi_release(struct usb_serial *serial)
1339 {
1340         int i;
1341         dbg("digi_release: TOP, in_interrupt()=%ld", in_interrupt());
1342
1343         /* free the private data structures for all ports */
1344         /* number of regular ports + 1 for the out-of-band port */
1345         for (i = 0; i < serial->type->num_ports + 1; i++)
1346                 kfree(usb_get_serial_port_data(serial->port[i]));
1347         kfree(usb_get_serial_data(serial));
1348 }
1349
1350
1351 static void digi_read_bulk_callback(struct urb *urb)
1352 {
1353         struct usb_serial_port *port = urb->context;
1354         struct digi_port *priv;
1355         struct digi_serial *serial_priv;
1356         int ret;
1357         int status = urb->status;
1358
1359         dbg("digi_read_bulk_callback: TOP");
1360
1361         /* port sanity check, do not resubmit if port is not valid */
1362         if (port == NULL)
1363                 return;
1364         priv = usb_get_serial_port_data(port);
1365         if (priv == NULL) {
1366                 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1367                         __func__, status);
1368                 return;
1369         }
1370         if (port->serial == NULL ||
1371                 (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1372                 dev_err(&port->dev, "%s: serial is bad or serial->private "
1373                         "is NULL, status=%d\n", __func__, status);
1374                 return;
1375         }
1376
1377         /* do not resubmit urb if it has any status error */
1378         if (status) {
1379                 dev_err(&port->dev,
1380                         "%s: nonzero read bulk status: status=%d, port=%d\n",
1381                         __func__, status, priv->dp_port_num);
1382                 return;
1383         }
1384
1385         /* handle oob or inb callback, do not resubmit if error */
1386         if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1387                 if (digi_read_oob_callback(urb) != 0)
1388                         return;
1389         } else {
1390                 if (digi_read_inb_callback(urb) != 0)
1391                         return;
1392         }
1393
1394         /* continue read */
1395         ret = usb_submit_urb(urb, GFP_ATOMIC);
1396         if (ret != 0 && ret != -EPERM) {
1397                 dev_err(&port->dev,
1398                         "%s: failed resubmitting urb, ret=%d, port=%d\n",
1399                         __func__, ret, priv->dp_port_num);
1400         }
1401
1402 }
1403
1404 /*
1405  *  Digi Read INB Callback
1406  *
1407  *  Digi Read INB Callback handles reads on the in band ports, sending
1408  *  the data on to the tty subsystem.  When called we know port and
1409  *  port->private are not NULL and port->serial has been validated.
1410  *  It returns 0 if successful, 1 if successful but the port is
1411  *  throttled, and -1 if the sanity checks failed.
1412  */
1413
1414 static int digi_read_inb_callback(struct urb *urb)
1415 {
1416
1417         struct usb_serial_port *port = urb->context;
1418         struct tty_struct *tty;
1419         struct digi_port *priv = usb_get_serial_port_data(port);
1420         int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1421         int len = ((unsigned char *)urb->transfer_buffer)[1];
1422         int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1423         unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3;
1424         int flag, throttled;
1425         int status = urb->status;
1426
1427         /* do not process callbacks on closed ports */
1428         /* but do continue the read chain */
1429         if (urb->status == -ENOENT)
1430                 return 0;
1431
1432         /* short/multiple packet check */
1433         if (urb->actual_length != len + 2) {
1434                 dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, "
1435                         "status=%d, port=%d, opcode=%d, len=%d, "
1436                         "actual_length=%d, status=%d\n", __func__, status,
1437                         priv->dp_port_num, opcode, len, urb->actual_length,
1438                         port_status);
1439                 return -1;
1440         }
1441
1442         tty = tty_port_tty_get(&port->port);
1443         spin_lock(&priv->dp_port_lock);
1444
1445         /* check for throttle; if set, do not resubmit read urb */
1446         /* indicate the read chain needs to be restarted on unthrottle */
1447         throttled = priv->dp_throttled;
1448         if (throttled)
1449                 priv->dp_throttle_restart = 1;
1450
1451         /* receive data */
1452         if (tty && opcode == DIGI_CMD_RECEIVE_DATA) {
1453                 /* get flag from port_status */
1454                 flag = 0;
1455
1456                 /* overrun is special, not associated with a char */
1457                 if (port_status & DIGI_OVERRUN_ERROR)
1458                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1459
1460                 /* break takes precedence over parity, */
1461                 /* which takes precedence over framing errors */
1462                 if (port_status & DIGI_BREAK_ERROR)
1463                         flag = TTY_BREAK;
1464                 else if (port_status & DIGI_PARITY_ERROR)
1465                         flag = TTY_PARITY;
1466                 else if (port_status & DIGI_FRAMING_ERROR)
1467                         flag = TTY_FRAME;
1468
1469                 /* data length is len-1 (one byte of len is port_status) */
1470                 --len;
1471                 if (len > 0) {
1472                         tty_insert_flip_string_fixed_flag(tty, data, flag,
1473                                                                         len);
1474                         tty_flip_buffer_push(tty);
1475                 }
1476         }
1477         spin_unlock(&priv->dp_port_lock);
1478         tty_kref_put(tty);
1479
1480         if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1481                 dbg("%s: got RECEIVE_DISABLE", __func__);
1482         else if (opcode != DIGI_CMD_RECEIVE_DATA)
1483                 dbg("%s: unknown opcode: %d", __func__, opcode);
1484
1485         return throttled ? 1 : 0;
1486
1487 }
1488
1489
1490 /*
1491  *  Digi Read OOB Callback
1492  *
1493  *  Digi Read OOB Callback handles reads on the out of band port.
1494  *  When called we know port and port->private are not NULL and
1495  *  the port->serial is valid.  It returns 0 if successful, and
1496  *  -1 if the sanity checks failed.
1497  */
1498
1499 static int digi_read_oob_callback(struct urb *urb)
1500 {
1501
1502         struct usb_serial_port *port = urb->context;
1503         struct usb_serial *serial = port->serial;
1504         struct tty_struct *tty;
1505         struct digi_port *priv = usb_get_serial_port_data(port);
1506         int opcode, line, status, val;
1507         int i;
1508         unsigned int rts;
1509
1510         dbg("digi_read_oob_callback: port=%d, len=%d",
1511                         priv->dp_port_num, urb->actual_length);
1512
1513         /* handle each oob command */
1514         for (i = 0; i < urb->actual_length - 3;) {
1515                 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1516                 line = ((unsigned char *)urb->transfer_buffer)[i++];
1517                 status = ((unsigned char *)urb->transfer_buffer)[i++];
1518                 val = ((unsigned char *)urb->transfer_buffer)[i++];
1519
1520                 dbg("digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1521                         opcode, line, status, val);
1522
1523                 if (status != 0 || line >= serial->type->num_ports)
1524                         continue;
1525
1526                 port = serial->port[line];
1527
1528                 priv = usb_get_serial_port_data(port);
1529                 if (priv == NULL)
1530                         return -1;
1531
1532                 tty = tty_port_tty_get(&port->port);
1533
1534                 rts = 0;
1535                 if (tty)
1536                         rts = tty->termios->c_cflag & CRTSCTS;
1537
1538                 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1539                         spin_lock(&priv->dp_port_lock);
1540                         /* convert from digi flags to termiox flags */
1541                         if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1542                                 priv->dp_modem_signals |= TIOCM_CTS;
1543                                 /* port must be open to use tty struct */
1544                                 if (rts) {
1545                                         tty->hw_stopped = 0;
1546                                         digi_wakeup_write(port);
1547                                 }
1548                         } else {
1549                                 priv->dp_modem_signals &= ~TIOCM_CTS;
1550                                 /* port must be open to use tty struct */
1551                                 if (rts)
1552                                         tty->hw_stopped = 1;
1553                         }
1554                         if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1555                                 priv->dp_modem_signals |= TIOCM_DSR;
1556                         else
1557                                 priv->dp_modem_signals &= ~TIOCM_DSR;
1558                         if (val & DIGI_READ_INPUT_SIGNALS_RI)
1559                                 priv->dp_modem_signals |= TIOCM_RI;
1560                         else
1561                                 priv->dp_modem_signals &= ~TIOCM_RI;
1562                         if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1563                                 priv->dp_modem_signals |= TIOCM_CD;
1564                         else
1565                                 priv->dp_modem_signals &= ~TIOCM_CD;
1566
1567                         wake_up_interruptible(&priv->dp_modem_change_wait);
1568                         spin_unlock(&priv->dp_port_lock);
1569                 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1570                         spin_lock(&priv->dp_port_lock);
1571                         priv->dp_transmit_idle = 1;
1572                         wake_up_interruptible(&priv->dp_transmit_idle_wait);
1573                         spin_unlock(&priv->dp_port_lock);
1574                 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1575                         wake_up_interruptible(&priv->dp_flush_wait);
1576                 }
1577                 tty_kref_put(tty);
1578         }
1579         return 0;
1580
1581 }
1582
1583 static int __init digi_init(void)
1584 {
1585         int retval;
1586         retval = usb_serial_register(&digi_acceleport_2_device);
1587         if (retval)
1588                 goto failed_acceleport_2_device;
1589         retval = usb_serial_register(&digi_acceleport_4_device);
1590         if (retval)
1591                 goto failed_acceleport_4_device;
1592         retval = usb_register(&digi_driver);
1593         if (retval)
1594                 goto failed_usb_register;
1595         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1596                DRIVER_DESC "\n");
1597         return 0;
1598 failed_usb_register:
1599         usb_serial_deregister(&digi_acceleport_4_device);
1600 failed_acceleport_4_device:
1601         usb_serial_deregister(&digi_acceleport_2_device);
1602 failed_acceleport_2_device:
1603         return retval;
1604 }
1605
1606 static void __exit digi_exit (void)
1607 {
1608         usb_deregister(&digi_driver);
1609         usb_serial_deregister(&digi_acceleport_2_device);
1610         usb_serial_deregister(&digi_acceleport_4_device);
1611 }
1612
1613
1614 module_init(digi_init);
1615 module_exit(digi_exit);
1616
1617
1618 MODULE_AUTHOR(DRIVER_AUTHOR);
1619 MODULE_DESCRIPTION(DRIVER_DESC);
1620 MODULE_LICENSE("GPL");
1621
1622 module_param(debug, bool, S_IRUGO | S_IWUSR);
1623 MODULE_PARM_DESC(debug, "Debug enabled or not");