drivers/usb/serial/digi_acceleport.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3 *  Digi AccelePort USB-4 and USB-2 Serial Converters
   4 *
   5 *  Copyright 2000 by Digi International
   6 *
   7 *  Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
   8 *  usb-serial driver.
   9 *
  10 *  Peter Berger (pberger@brimson.com)
  11 *  Al Borchers (borchers@steinerpoint.com)
  12 */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/tty.h>
  18 #include <linux/tty_driver.h>
  19 #include <linux/tty_flip.h>
  20 #include <linux/module.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/usb.h>
  24 #include <linux/wait.h>
  25 #include <linux/sched/signal.h>
  26 #include <linux/usb/serial.h>
  27
  28 /* Defines */
  29
  30 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
  31 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
  32
  33 /* port output buffer length -- must be <= transfer buffer length - 2 */
  34 /* so we can be sure to send the full buffer in one urb */
  35 #define DIGI_OUT_BUF_SIZE               8
  36
  37 /* port input buffer length -- must be >= transfer buffer length - 3 */
  38 /* so we can be sure to hold at least one full buffer from one urb */
  39 #define DIGI_IN_BUF_SIZE                64
  40
  41 /* retry timeout while sleeping */
  42 #define DIGI_RETRY_TIMEOUT              (HZ/10)
  43
  44 /* timeout while waiting for tty output to drain in close */
  45 /* this delay is used twice in close, so the total delay could */
  46 /* be twice this value */
  47 #define DIGI_CLOSE_TIMEOUT              (5*HZ)
  48
  49
  50 /* AccelePort USB Defines */
  51
  52 /* ids */
  53 #define DIGI_VENDOR_ID                  0x05c5
  54 #define DIGI_2_ID                       0x0002  /* USB-2 */
  55 #define DIGI_4_ID                       0x0004  /* USB-4 */
  56
  57 /* commands
  58  * "INB": can be used on the in-band endpoint
  59  * "OOB": can be used on the out-of-band endpoint
  60  */
  61 #define DIGI_CMD_SET_BAUD_RATE                  0       /* INB, OOB */
  62 #define DIGI_CMD_SET_WORD_SIZE                  1       /* INB, OOB */
  63 #define DIGI_CMD_SET_PARITY                     2       /* INB, OOB */
  64 #define DIGI_CMD_SET_STOP_BITS                  3       /* INB, OOB */
  65 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL         4       /* INB, OOB */
  66 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL        5       /* INB, OOB */
  67 #define DIGI_CMD_SET_DTR_SIGNAL                 6       /* INB, OOB */
  68 #define DIGI_CMD_SET_RTS_SIGNAL                 7       /* INB, OOB */
  69 #define DIGI_CMD_READ_INPUT_SIGNALS             8       /*      OOB */
  70 #define DIGI_CMD_IFLUSH_FIFO                    9       /*      OOB */
  71 #define DIGI_CMD_RECEIVE_ENABLE                 10      /* INB, OOB */
  72 #define DIGI_CMD_BREAK_CONTROL                  11      /* INB, OOB */
  73 #define DIGI_CMD_LOCAL_LOOPBACK                 12      /* INB, OOB */
  74 #define DIGI_CMD_TRANSMIT_IDLE                  13      /* INB, OOB */
  75 #define DIGI_CMD_READ_UART_REGISTER             14      /*      OOB */
  76 #define DIGI_CMD_WRITE_UART_REGISTER            15      /* INB, OOB */
  77 #define DIGI_CMD_AND_UART_REGISTER              16      /* INB, OOB */
  78 #define DIGI_CMD_OR_UART_REGISTER               17      /* INB, OOB */
  79 #define DIGI_CMD_SEND_DATA                      18      /* INB      */
  80 #define DIGI_CMD_RECEIVE_DATA                   19      /* INB      */
  81 #define DIGI_CMD_RECEIVE_DISABLE                20      /* INB      */
  82 #define DIGI_CMD_GET_PORT_TYPE                  21      /*      OOB */
  83
  84 /* baud rates */
  85 #define DIGI_BAUD_50                            0
  86 #define DIGI_BAUD_75                            1
  87 #define DIGI_BAUD_110                           2
  88 #define DIGI_BAUD_150                           3
  89 #define DIGI_BAUD_200                           4
  90 #define DIGI_BAUD_300                           5
  91 #define DIGI_BAUD_600                           6
  92 #define DIGI_BAUD_1200                          7
  93 #define DIGI_BAUD_1800                          8
  94 #define DIGI_BAUD_2400                          9
  95 #define DIGI_BAUD_4800                          10
  96 #define DIGI_BAUD_7200                          11
  97 #define DIGI_BAUD_9600                          12
  98 #define DIGI_BAUD_14400                         13
  99 #define DIGI_BAUD_19200                         14
 100 #define DIGI_BAUD_28800                         15
 101 #define DIGI_BAUD_38400                         16
 102 #define DIGI_BAUD_57600                         17
 103 #define DIGI_BAUD_76800                         18
 104 #define DIGI_BAUD_115200                        19
 105 #define DIGI_BAUD_153600                        20
 106 #define DIGI_BAUD_230400                        21
 107 #define DIGI_BAUD_460800                        22
 108
 109 /* arguments */
 110 #define DIGI_WORD_SIZE_5                        0
 111 #define DIGI_WORD_SIZE_6                        1
 112 #define DIGI_WORD_SIZE_7                        2
 113 #define DIGI_WORD_SIZE_8                        3
 114
 115 #define DIGI_PARITY_NONE                        0
 116 #define DIGI_PARITY_ODD                         1
 117 #define DIGI_PARITY_EVEN                        2
 118 #define DIGI_PARITY_MARK                        3
 119 #define DIGI_PARITY_SPACE                       4
 120
 121 #define DIGI_STOP_BITS_1                        0
 122 #define DIGI_STOP_BITS_2                        1
 123
 124 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF        1
 125 #define DIGI_INPUT_FLOW_CONTROL_RTS             2
 126 #define DIGI_INPUT_FLOW_CONTROL_DTR             4
 127
 128 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF       1
 129 #define DIGI_OUTPUT_FLOW_CONTROL_CTS            2
 130 #define DIGI_OUTPUT_FLOW_CONTROL_DSR            4
 131
 132 #define DIGI_DTR_INACTIVE                       0
 133 #define DIGI_DTR_ACTIVE                         1
 134 #define DIGI_DTR_INPUT_FLOW_CONTROL             2
 135
 136 #define DIGI_RTS_INACTIVE                       0
 137 #define DIGI_RTS_ACTIVE                         1
 138 #define DIGI_RTS_INPUT_FLOW_CONTROL             2
 139 #define DIGI_RTS_TOGGLE                         3
 140
 141 #define DIGI_FLUSH_TX                           1
 142 #define DIGI_FLUSH_RX                           2
 143 #define DIGI_RESUME_TX                          4 /* clears xoff condition */
 144
 145 #define DIGI_TRANSMIT_NOT_IDLE                  0
 146 #define DIGI_TRANSMIT_IDLE                      1
 147
 148 #define DIGI_DISABLE                            0
 149 #define DIGI_ENABLE                             1
 150
 151 #define DIGI_DEASSERT                           0
 152 #define DIGI_ASSERT                             1
 153
 154 /* in band status codes */
 155 #define DIGI_OVERRUN_ERROR                      4
 156 #define DIGI_PARITY_ERROR                       8
 157 #define DIGI_FRAMING_ERROR                      16
 158 #define DIGI_BREAK_ERROR                        32
 159
 160 /* out of band status */
 161 #define DIGI_NO_ERROR                           0
 162 #define DIGI_BAD_FIRST_PARAMETER                1
 163 #define DIGI_BAD_SECOND_PARAMETER               2
 164 #define DIGI_INVALID_LINE                       3
 165 #define DIGI_INVALID_OPCODE                     4
 166
 167 /* input signals */
 168 #define DIGI_READ_INPUT_SIGNALS_SLOT            1
 169 #define DIGI_READ_INPUT_SIGNALS_ERR             2
 170 #define DIGI_READ_INPUT_SIGNALS_BUSY            4
 171 #define DIGI_READ_INPUT_SIGNALS_PE              8
 172 #define DIGI_READ_INPUT_SIGNALS_CTS             16
 173 #define DIGI_READ_INPUT_SIGNALS_DSR             32
 174 #define DIGI_READ_INPUT_SIGNALS_RI              64
 175 #define DIGI_READ_INPUT_SIGNALS_DCD             128
 176
 177
 178 /* Structures */
 179
 180 struct digi_serial {
 181         spinlock_t ds_serial_lock;
 182         struct usb_serial_port *ds_oob_port;    /* out-of-band port */
 183         int ds_oob_port_num;                    /* index of out-of-band port */
 184         int ds_device_started;
 185 };
 186
 187 struct digi_port {
 188         spinlock_t dp_port_lock;
 189         int dp_port_num;
 190         int dp_out_buf_len;
 191         unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
 192         int dp_write_urb_in_use;
 193         unsigned int dp_modem_signals;
 194         int dp_transmit_idle;
 195         wait_queue_head_t dp_transmit_idle_wait;
 196         int dp_throttled;
 197         int dp_throttle_restart;
 198         wait_queue_head_t dp_flush_wait;
 199         wait_queue_head_t dp_close_wait;        /* wait queue for close */
 200         wait_queue_head_t write_wait;
 201         struct usb_serial_port *dp_port;
 202 };
 203
 204
 205 /* Local Function Declarations */
 206
 207 static int digi_write_oob_command(struct usb_serial_port *port,
 208         unsigned char *buf, int count, int interruptible);
 209 static int digi_write_inb_command(struct usb_serial_port *port,
 210         unsigned char *buf, int count, unsigned long timeout);
 211 static int digi_set_modem_signals(struct usb_serial_port *port,
 212         unsigned int modem_signals, int interruptible);
 213 static int digi_transmit_idle(struct usb_serial_port *port,
 214         unsigned long timeout);
 215 static void digi_rx_throttle(struct tty_struct *tty);
 216 static void digi_rx_unthrottle(struct tty_struct *tty);
 217 static void digi_set_termios(struct tty_struct *tty,
 218                 struct usb_serial_port *port, struct ktermios *old_termios);
 219 static void digi_break_ctl(struct tty_struct *tty, int break_state);
 220 static int digi_tiocmget(struct tty_struct *tty);
 221 static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
 222                 unsigned int clear);
 223 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
 224                 const unsigned char *buf, int count);
 225 static void digi_write_bulk_callback(struct urb *urb);
 226 static unsigned int digi_write_room(struct tty_struct *tty);
 227 static unsigned int digi_chars_in_buffer(struct tty_struct *tty);
 228 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
 229 static void digi_close(struct usb_serial_port *port);
 230 static void digi_dtr_rts(struct usb_serial_port *port, int on);
 231 static int digi_startup_device(struct usb_serial *serial);
 232 static int digi_startup(struct usb_serial *serial);
 233 static void digi_disconnect(struct usb_serial *serial);
 234 static void digi_release(struct usb_serial *serial);
 235 static int digi_port_probe(struct usb_serial_port *port);
 236 static void digi_port_remove(struct usb_serial_port *port);
 237 static void digi_read_bulk_callback(struct urb *urb);
 238 static int digi_read_inb_callback(struct urb *urb);
 239 static int digi_read_oob_callback(struct urb *urb);
 240
 241
 242 static const struct usb_device_id id_table_combined[] = {
 243         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
 244         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
 245         { }                                             /* Terminating entry */
 246 };
 247
 248 static const struct usb_device_id id_table_2[] = {
 249         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
 250         { }                                             /* Terminating entry */
 251 };
 252
 253 static const struct usb_device_id id_table_4[] = {
 254         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
 255         { }                                             /* Terminating entry */
 256 };
 257
 258 MODULE_DEVICE_TABLE(usb, id_table_combined);
 259
 260 /* device info needed for the Digi serial converter */
 261
 262 static struct usb_serial_driver digi_acceleport_2_device = {
 263         .driver = {
 264                 .owner =                THIS_MODULE,
 265                 .name =                 "digi_2",
 266         },
 267         .description =                  "Digi 2 port USB adapter",
 268         .id_table =                     id_table_2,
 269         .num_ports =                    3,
 270         .num_bulk_in =                  4,
 271         .num_bulk_out =                 4,
 272         .open =                         digi_open,
 273         .close =                        digi_close,
 274         .dtr_rts =                      digi_dtr_rts,
 275         .write =                        digi_write,
 276         .write_room =                   digi_write_room,
 277         .write_bulk_callback =          digi_write_bulk_callback,
 278         .read_bulk_callback =           digi_read_bulk_callback,
 279         .chars_in_buffer =              digi_chars_in_buffer,
 280         .throttle =                     digi_rx_throttle,
 281         .unthrottle =                   digi_rx_unthrottle,
 282         .set_termios =                  digi_set_termios,
 283         .break_ctl =                    digi_break_ctl,
 284         .tiocmget =                     digi_tiocmget,
 285         .tiocmset =                     digi_tiocmset,
 286         .attach =                       digi_startup,
 287         .disconnect =                   digi_disconnect,
 288         .release =                      digi_release,
 289         .port_probe =                   digi_port_probe,
 290         .port_remove =                  digi_port_remove,
 291 };
 292
 293 static struct usb_serial_driver digi_acceleport_4_device = {
 294         .driver = {
 295                 .owner =                THIS_MODULE,
 296                 .name =                 "digi_4",
 297         },
 298         .description =                  "Digi 4 port USB adapter",
 299         .id_table =                     id_table_4,
 300         .num_ports =                    4,
 301         .num_bulk_in =                  5,
 302         .num_bulk_out =                 5,
 303         .open =                         digi_open,
 304         .close =                        digi_close,
 305         .write =                        digi_write,
 306         .write_room =                   digi_write_room,
 307         .write_bulk_callback =          digi_write_bulk_callback,
 308         .read_bulk_callback =           digi_read_bulk_callback,
 309         .chars_in_buffer =              digi_chars_in_buffer,
 310         .throttle =                     digi_rx_throttle,
 311         .unthrottle =                   digi_rx_unthrottle,
 312         .set_termios =                  digi_set_termios,
 313         .break_ctl =                    digi_break_ctl,
 314         .tiocmget =                     digi_tiocmget,
 315         .tiocmset =                     digi_tiocmset,
 316         .attach =                       digi_startup,
 317         .disconnect =                   digi_disconnect,
 318         .release =                      digi_release,
 319         .port_probe =                   digi_port_probe,
 320         .port_remove =                  digi_port_remove,
 321 };
 322
 323 static struct usb_serial_driver * const serial_drivers[] = {
 324         &digi_acceleport_2_device, &digi_acceleport_4_device, NULL
 325 };
 326
 327 /* Functions */
 328
 329 /*
 330  *  Cond Wait Interruptible Timeout Irqrestore
 331  *
 332  *  Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
 333  *  so that wake ups are not lost if they occur between the unlock
 334  *  and the sleep.  In other words, spin_unlock_irqrestore and
 335  *  interruptible_sleep_on_timeout are "atomic" with respect to
 336  *  wake ups.  This is used to implement condition variables.
 337  *
 338  *  interruptible_sleep_on_timeout is deprecated and has been replaced
 339  *  with the equivalent code.
 340  */
 341
 342 static long cond_wait_interruptible_timeout_irqrestore(
 343         wait_queue_head_t *q, long timeout,
 344         spinlock_t *lock, unsigned long flags)
 345 __releases(lock)
 346 {
 347         DEFINE_WAIT(wait);
 348
 349         prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
 350         spin_unlock_irqrestore(lock, flags);
 351         timeout = schedule_timeout(timeout);
 352         finish_wait(q, &wait);
 353
 354         return timeout;
 355 }
 356
 357 /*
 358  *  Digi Write OOB Command
 359  *
 360  *  Write commands on the out of band port.  Commands are 4
 361  *  bytes each, multiple commands can be sent at once, and
 362  *  no command will be split across USB packets.  Returns 0
 363  *  if successful, -EINTR if interrupted while sleeping and
 364  *  the interruptible flag is true, or a negative error
 365  *  returned by usb_submit_urb.
 366  */
 367
 368 static int digi_write_oob_command(struct usb_serial_port *port,
 369         unsigned char *buf, int count, int interruptible)
 370 {
 371         int ret = 0;
 372         int len;
 373         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 374         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 375         unsigned long flags;
 376
 377         dev_dbg(&port->dev,
 378                 "digi_write_oob_command: TOP: port=%d, count=%d\n",
 379                 oob_priv->dp_port_num, count);
 380
 381         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 382         while (count > 0) {
 383                 while (oob_priv->dp_write_urb_in_use) {
 384                         cond_wait_interruptible_timeout_irqrestore(
 385                                 &oob_priv->write_wait, DIGI_RETRY_TIMEOUT,
 386                                 &oob_priv->dp_port_lock, flags);
 387                         if (interruptible && signal_pending(current))
 388                                 return -EINTR;
 389                         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 390                 }
 391
 392                 /* len must be a multiple of 4, so commands are not split */
 393                 len = min(count, oob_port->bulk_out_size);
 394                 if (len > 4)
 395                         len &= ~3;
 396                 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
 397                 oob_port->write_urb->transfer_buffer_length = len;
 398                 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
 399                 if (ret == 0) {
 400                         oob_priv->dp_write_urb_in_use = 1;
 401                         count -= len;
 402                         buf += len;
 403                 }
 404         }
 405         spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
 406         if (ret)
 407                 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
 408                         __func__, ret);
 409         return ret;
 410
 411 }
 412
 413
 414 /*
 415  *  Digi Write In Band Command
 416  *
 417  *  Write commands on the given port.  Commands are 4
 418  *  bytes each, multiple commands can be sent at once, and
 419  *  no command will be split across USB packets.  If timeout
 420  *  is non-zero, write in band command will return after
 421  *  waiting unsuccessfully for the URB status to clear for
 422  *  timeout ticks.  Returns 0 if successful, or a negative
 423  *  error returned by digi_write.
 424  */
 425
 426 static int digi_write_inb_command(struct usb_serial_port *port,
 427         unsigned char *buf, int count, unsigned long timeout)
 428 {
 429         int ret = 0;
 430         int len;
 431         struct digi_port *priv = usb_get_serial_port_data(port);
 432         unsigned char *data = port->write_urb->transfer_buffer;
 433         unsigned long flags;
 434
 435         dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",
 436                 priv->dp_port_num, count);
 437
 438         if (timeout)
 439                 timeout += jiffies;
 440         else
 441                 timeout = ULONG_MAX;
 442
 443         spin_lock_irqsave(&priv->dp_port_lock, flags);
 444         while (count > 0 && ret == 0) {
 445                 while (priv->dp_write_urb_in_use &&
 446                        time_before(jiffies, timeout)) {
 447                         cond_wait_interruptible_timeout_irqrestore(
 448                                 &priv->write_wait, DIGI_RETRY_TIMEOUT,
 449                                 &priv->dp_port_lock, flags);
 450                         if (signal_pending(current))
 451                                 return -EINTR;
 452                         spin_lock_irqsave(&priv->dp_port_lock, flags);
 453                 }
 454
 455                 /* len must be a multiple of 4 and small enough to */
 456                 /* guarantee the write will send buffered data first, */
 457                 /* so commands are in order with data and not split */
 458                 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
 459                 if (len > 4)
 460                         len &= ~3;
 461
 462                 /* write any buffered data first */
 463                 if (priv->dp_out_buf_len > 0) {
 464                         data[0] = DIGI_CMD_SEND_DATA;
 465                         data[1] = priv->dp_out_buf_len;
 466                         memcpy(data + 2, priv->dp_out_buf,
 467                                 priv->dp_out_buf_len);
 468                         memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
 469                         port->write_urb->transfer_buffer_length
 470                                 = priv->dp_out_buf_len + 2 + len;
 471                 } else {
 472                         memcpy(data, buf, len);
 473                         port->write_urb->transfer_buffer_length = len;
 474                 }
 475
 476                 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 477                 if (ret == 0) {
 478                         priv->dp_write_urb_in_use = 1;
 479                         priv->dp_out_buf_len = 0;
 480                         count -= len;
 481                         buf += len;
 482                 }
 483
 484         }
 485         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 486
 487         if (ret)
 488                 dev_err(&port->dev,
 489                         "%s: usb_submit_urb failed, ret=%d, port=%d\n",
 490                         __func__, ret, priv->dp_port_num);
 491         return ret;
 492 }
 493
 494
 495 /*
 496  *  Digi Set Modem Signals
 497  *
 498  *  Sets or clears DTR and RTS on the port, according to the
 499  *  modem_signals argument.  Use TIOCM_DTR and TIOCM_RTS flags
 500  *  for the modem_signals argument.  Returns 0 if successful,
 501  *  -EINTR if interrupted while sleeping, or a non-zero error
 502  *  returned by usb_submit_urb.
 503  */
 504
 505 static int digi_set_modem_signals(struct usb_serial_port *port,
 506         unsigned int modem_signals, int interruptible)
 507 {
 508
 509         int ret;
 510         struct digi_port *port_priv = usb_get_serial_port_data(port);
 511         struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 512         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 513         unsigned char *data = oob_port->write_urb->transfer_buffer;
 514         unsigned long flags;
 515
 516         dev_dbg(&port->dev,
 517                 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n",
 518                 port_priv->dp_port_num, modem_signals);
 519
 520         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 521         spin_lock(&port_priv->dp_port_lock);
 522
 523         while (oob_priv->dp_write_urb_in_use) {
 524                 spin_unlock(&port_priv->dp_port_lock);
 525                 cond_wait_interruptible_timeout_irqrestore(
 526                         &oob_priv->write_wait, DIGI_RETRY_TIMEOUT,
 527                         &oob_priv->dp_port_lock, flags);
 528                 if (interruptible && signal_pending(current))
 529                         return -EINTR;
 530                 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 531                 spin_lock(&port_priv->dp_port_lock);
 532         }
 533         data[0] = DIGI_CMD_SET_DTR_SIGNAL;
 534         data[1] = port_priv->dp_port_num;
 535         data[2] = (modem_signals & TIOCM_DTR) ?
 536                                         DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
 537         data[3] = 0;
 538         data[4] = DIGI_CMD_SET_RTS_SIGNAL;
 539         data[5] = port_priv->dp_port_num;
 540         data[6] = (modem_signals & TIOCM_RTS) ?
 541                                         DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
 542         data[7] = 0;
 543
 544         oob_port->write_urb->transfer_buffer_length = 8;
 545
 546         ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
 547         if (ret == 0) {
 548                 oob_priv->dp_write_urb_in_use = 1;
 549                 port_priv->dp_modem_signals &= ~(TIOCM_DTR | TIOCM_RTS);
 550                 port_priv->dp_modem_signals |=
 551                                 modem_signals & (TIOCM_DTR | TIOCM_RTS);
 552         }
 553         spin_unlock(&port_priv->dp_port_lock);
 554         spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
 555         if (ret)
 556                 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
 557                         __func__, ret);
 558         return ret;
 559 }
 560
 561 /*
 562  *  Digi Transmit Idle
 563  *
 564  *  Digi transmit idle waits, up to timeout ticks, for the transmitter
 565  *  to go idle.  It returns 0 if successful or a negative error.
 566  *
 567  *  There are race conditions here if more than one process is calling
 568  *  digi_transmit_idle on the same port at the same time.  However, this
 569  *  is only called from close, and only one process can be in close on a
 570  *  port at a time, so its ok.
 571  */
 572
 573 static int digi_transmit_idle(struct usb_serial_port *port,
 574         unsigned long timeout)
 575 {
 576         int ret;
 577         unsigned char buf[2];
 578         struct digi_port *priv = usb_get_serial_port_data(port);
 579         unsigned long flags;
 580
 581         spin_lock_irqsave(&priv->dp_port_lock, flags);
 582         priv->dp_transmit_idle = 0;
 583         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 584
 585         buf[0] = DIGI_CMD_TRANSMIT_IDLE;
 586         buf[1] = 0;
 587
 588         timeout += jiffies;
 589
 590         ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
 591         if (ret != 0)
 592                 return ret;
 593
 594         spin_lock_irqsave(&priv->dp_port_lock, flags);
 595
 596         while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
 597                 cond_wait_interruptible_timeout_irqrestore(
 598                         &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
 599                         &priv->dp_port_lock, flags);
 600                 if (signal_pending(current))
 601                         return -EINTR;
 602                 spin_lock_irqsave(&priv->dp_port_lock, flags);
 603         }
 604         priv->dp_transmit_idle = 0;
 605         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 606         return 0;
 607
 608 }
 609
 610
 611 static void digi_rx_throttle(struct tty_struct *tty)
 612 {
 613         unsigned long flags;
 614         struct usb_serial_port *port = tty->driver_data;
 615         struct digi_port *priv = usb_get_serial_port_data(port);
 616
 617         /* stop receiving characters by not resubmitting the read urb */
 618         spin_lock_irqsave(&priv->dp_port_lock, flags);
 619         priv->dp_throttled = 1;
 620         priv->dp_throttle_restart = 0;
 621         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 622 }
 623
 624
 625 static void digi_rx_unthrottle(struct tty_struct *tty)
 626 {
 627         int ret = 0;
 628         unsigned long flags;
 629         struct usb_serial_port *port = tty->driver_data;
 630         struct digi_port *priv = usb_get_serial_port_data(port);
 631
 632         spin_lock_irqsave(&priv->dp_port_lock, flags);
 633
 634         /* restart read chain */
 635         if (priv->dp_throttle_restart)
 636                 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 637
 638         /* turn throttle off */
 639         priv->dp_throttled = 0;
 640         priv->dp_throttle_restart = 0;
 641
 642         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 643
 644         if (ret)
 645                 dev_err(&port->dev,
 646                         "%s: usb_submit_urb failed, ret=%d, port=%d\n",
 647                         __func__, ret, priv->dp_port_num);
 648 }
 649
 650
 651 static void digi_set_termios(struct tty_struct *tty,
 652                 struct usb_serial_port *port, struct ktermios *old_termios)
 653 {
 654         struct digi_port *priv = usb_get_serial_port_data(port);
 655         struct device *dev = &port->dev;
 656         unsigned int iflag = tty->termios.c_iflag;
 657         unsigned int cflag = tty->termios.c_cflag;
 658         unsigned int old_iflag = old_termios->c_iflag;
 659         unsigned int old_cflag = old_termios->c_cflag;
 660         unsigned char buf[32];
 661         unsigned int modem_signals;
 662         int arg, ret;
 663         int i = 0;
 664         speed_t baud;
 665
 666         dev_dbg(dev,
 667                 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n",
 668                 priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
 669
 670         /* set baud rate */
 671         baud = tty_get_baud_rate(tty);
 672         if (baud != tty_termios_baud_rate(old_termios)) {
 673                 arg = -1;
 674
 675                 /* reassert DTR and (maybe) RTS on transition from B0 */
 676                 if ((old_cflag & CBAUD) == B0) {
 677                         /* don't set RTS if using hardware flow control */
 678                         /* and throttling input */
 679                         modem_signals = TIOCM_DTR;
 680                         if (!C_CRTSCTS(tty) || !tty_throttled(tty))
 681                                 modem_signals |= TIOCM_RTS;
 682                         digi_set_modem_signals(port, modem_signals, 1);
 683                 }
 684                 switch (baud) {
 685                 /* drop DTR and RTS on transition to B0 */
 686                 case 0: digi_set_modem_signals(port, 0, 1); break;
 687                 case 50: arg = DIGI_BAUD_50; break;
 688                 case 75: arg = DIGI_BAUD_75; break;
 689                 case 110: arg = DIGI_BAUD_110; break;
 690                 case 150: arg = DIGI_BAUD_150; break;
 691                 case 200: arg = DIGI_BAUD_200; break;
 692                 case 300: arg = DIGI_BAUD_300; break;
 693                 case 600: arg = DIGI_BAUD_600; break;
 694                 case 1200: arg = DIGI_BAUD_1200; break;
 695                 case 1800: arg = DIGI_BAUD_1800; break;
 696                 case 2400: arg = DIGI_BAUD_2400; break;
 697                 case 4800: arg = DIGI_BAUD_4800; break;
 698                 case 9600: arg = DIGI_BAUD_9600; break;
 699                 case 19200: arg = DIGI_BAUD_19200; break;
 700                 case 38400: arg = DIGI_BAUD_38400; break;
 701                 case 57600: arg = DIGI_BAUD_57600; break;
 702                 case 115200: arg = DIGI_BAUD_115200; break;
 703                 case 230400: arg = DIGI_BAUD_230400; break;
 704                 case 460800: arg = DIGI_BAUD_460800; break;
 705                 default:
 706                         arg = DIGI_BAUD_9600;
 707                         baud = 9600;
 708                         break;
 709                 }
 710                 if (arg != -1) {
 711                         buf[i++] = DIGI_CMD_SET_BAUD_RATE;
 712                         buf[i++] = priv->dp_port_num;
 713                         buf[i++] = arg;
 714                         buf[i++] = 0;
 715                 }
 716         }
 717         /* set parity */
 718         tty->termios.c_cflag &= ~CMSPAR;
 719
 720         if ((cflag & (PARENB | PARODD)) != (old_cflag & (PARENB | PARODD))) {
 721                 if (cflag & PARENB) {
 722                         if (cflag & PARODD)
 723                                 arg = DIGI_PARITY_ODD;
 724                         else
 725                                 arg = DIGI_PARITY_EVEN;
 726                 } else {
 727                         arg = DIGI_PARITY_NONE;
 728                 }
 729                 buf[i++] = DIGI_CMD_SET_PARITY;
 730                 buf[i++] = priv->dp_port_num;
 731                 buf[i++] = arg;
 732                 buf[i++] = 0;
 733         }
 734         /* set word size */
 735         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 736                 arg = -1;
 737                 switch (cflag & CSIZE) {
 738                 case CS5: arg = DIGI_WORD_SIZE_5; break;
 739                 case CS6: arg = DIGI_WORD_SIZE_6; break;
 740                 case CS7: arg = DIGI_WORD_SIZE_7; break;
 741                 case CS8: arg = DIGI_WORD_SIZE_8; break;
 742                 default:
 743                         dev_dbg(dev,
 744                                 "digi_set_termios: can't handle word size %d\n",
 745                                 cflag & CSIZE);
 746                         break;
 747                 }
 748
 749                 if (arg != -1) {
 750                         buf[i++] = DIGI_CMD_SET_WORD_SIZE;
 751                         buf[i++] = priv->dp_port_num;
 752                         buf[i++] = arg;
 753                         buf[i++] = 0;
 754                 }
 755
 756         }
 757
 758         /* set stop bits */
 759         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 760
 761                 if ((cflag & CSTOPB))
 762                         arg = DIGI_STOP_BITS_2;
 763                 else
 764                         arg = DIGI_STOP_BITS_1;
 765
 766                 buf[i++] = DIGI_CMD_SET_STOP_BITS;
 767                 buf[i++] = priv->dp_port_num;
 768                 buf[i++] = arg;
 769                 buf[i++] = 0;
 770
 771         }
 772
 773         /* set input flow control */
 774         if ((iflag & IXOFF) != (old_iflag & IXOFF) ||
 775                         (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 776                 arg = 0;
 777                 if (iflag & IXOFF)
 778                         arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
 779                 else
 780                         arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
 781
 782                 if (cflag & CRTSCTS) {
 783                         arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
 784
 785                         /* On USB-4 it is necessary to assert RTS prior */
 786                         /* to selecting RTS input flow control.  */
 787                         buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
 788                         buf[i++] = priv->dp_port_num;
 789                         buf[i++] = DIGI_RTS_ACTIVE;
 790                         buf[i++] = 0;
 791
 792                 } else {
 793                         arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
 794                 }
 795                 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
 796                 buf[i++] = priv->dp_port_num;
 797                 buf[i++] = arg;
 798                 buf[i++] = 0;
 799         }
 800
 801         /* set output flow control */
 802         if ((iflag & IXON) != (old_iflag & IXON) ||
 803                         (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 804                 arg = 0;
 805                 if (iflag & IXON)
 806                         arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
 807                 else
 808                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
 809
 810                 if (cflag & CRTSCTS)
 811                         arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
 812                 else
 813                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
 814
 815                 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
 816                 buf[i++] = priv->dp_port_num;
 817                 buf[i++] = arg;
 818                 buf[i++] = 0;
 819         }
 820
 821         /* set receive enable/disable */
 822         if ((cflag & CREAD) != (old_cflag & CREAD)) {
 823                 if (cflag & CREAD)
 824                         arg = DIGI_ENABLE;
 825                 else
 826                         arg = DIGI_DISABLE;
 827
 828                 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
 829                 buf[i++] = priv->dp_port_num;
 830                 buf[i++] = arg;
 831                 buf[i++] = 0;
 832         }
 833         ret = digi_write_oob_command(port, buf, i, 1);
 834         if (ret != 0)
 835                 dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret);
 836         tty_encode_baud_rate(tty, baud, baud);
 837 }
 838
 839
 840 static void digi_break_ctl(struct tty_struct *tty, int break_state)
 841 {
 842         struct usb_serial_port *port = tty->driver_data;
 843         unsigned char buf[4];
 844
 845         buf[0] = DIGI_CMD_BREAK_CONTROL;
 846         buf[1] = 2;                             /* length */
 847         buf[2] = break_state ? 1 : 0;
 848         buf[3] = 0;                             /* pad */
 849         digi_write_inb_command(port, buf, 4, 0);
 850 }
 851
 852
 853 static int digi_tiocmget(struct tty_struct *tty)
 854 {
 855         struct usb_serial_port *port = tty->driver_data;
 856         struct digi_port *priv = usb_get_serial_port_data(port);
 857         unsigned int val;
 858         unsigned long flags;
 859
 860         spin_lock_irqsave(&priv->dp_port_lock, flags);
 861         val = priv->dp_modem_signals;
 862         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 863         return val;
 864 }
 865
 866
 867 static int digi_tiocmset(struct tty_struct *tty,
 868                                         unsigned int set, unsigned int clear)
 869 {
 870         struct usb_serial_port *port = tty->driver_data;
 871         struct digi_port *priv = usb_get_serial_port_data(port);
 872         unsigned int val;
 873         unsigned long flags;
 874
 875         spin_lock_irqsave(&priv->dp_port_lock, flags);
 876         val = (priv->dp_modem_signals & ~clear) | set;
 877         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 878         return digi_set_modem_signals(port, val, 1);
 879 }
 880
 881
 882 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
 883                                         const unsigned char *buf, int count)
 884 {
 885
 886         int ret, data_len, new_len;
 887         struct digi_port *priv = usb_get_serial_port_data(port);
 888         unsigned char *data = port->write_urb->transfer_buffer;
 889         unsigned long flags;
 890
 891         dev_dbg(&port->dev, "digi_write: TOP: port=%d, count=%d\n",
 892                 priv->dp_port_num, count);
 893
 894         /* copy user data (which can sleep) before getting spin lock */
 895         count = min(count, port->bulk_out_size-2);
 896         count = min(64, count);
 897
 898         /* be sure only one write proceeds at a time */
 899         /* there are races on the port private buffer */
 900         spin_lock_irqsave(&priv->dp_port_lock, flags);
 901
 902         /* wait for urb status clear to submit another urb */
 903         if (priv->dp_write_urb_in_use) {
 904                 /* buffer data if count is 1 (probably put_char) if possible */
 905                 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
 906                         priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
 907                         new_len = 1;
 908                 } else {
 909                         new_len = 0;
 910                 }
 911                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 912                 return new_len;
 913         }
 914
 915         /* allow space for any buffered data and for new data, up to */
 916         /* transfer buffer size - 2 (for command and length bytes) */
 917         new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
 918         data_len = new_len + priv->dp_out_buf_len;
 919
 920         if (data_len == 0) {
 921                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 922                 return 0;
 923         }
 924
 925         port->write_urb->transfer_buffer_length = data_len+2;
 926
 927         *data++ = DIGI_CMD_SEND_DATA;
 928         *data++ = data_len;
 929
 930         /* copy in buffered data first */
 931         memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
 932         data += priv->dp_out_buf_len;
 933
 934         /* copy in new data */
 935         memcpy(data, buf, new_len);
 936
 937         ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 938         if (ret == 0) {
 939                 priv->dp_write_urb_in_use = 1;
 940                 ret = new_len;
 941                 priv->dp_out_buf_len = 0;
 942         }
 943
 944         /* return length of new data written, or error */
 945         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 946         if (ret < 0)
 947                 dev_err_console(port,
 948                         "%s: usb_submit_urb failed, ret=%d, port=%d\n",
 949                         __func__, ret, priv->dp_port_num);
 950         dev_dbg(&port->dev, "digi_write: returning %d\n", ret);
 951         return ret;
 952
 953 }
 954
 955 static void digi_write_bulk_callback(struct urb *urb)
 956 {
 957
 958         struct usb_serial_port *port = urb->context;
 959         struct usb_serial *serial;
 960         struct digi_port *priv;
 961         struct digi_serial *serial_priv;
 962         unsigned long flags;
 963         int ret = 0;
 964         int status = urb->status;
 965         bool wakeup;
 966
 967         /* port and serial sanity check */
 968         if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
 969                 pr_err("%s: port or port->private is NULL, status=%d\n",
 970                         __func__, status);
 971                 return;
 972         }
 973         serial = port->serial;
 974         if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
 975                 dev_err(&port->dev,
 976                         "%s: serial or serial->private is NULL, status=%d\n",
 977                         __func__, status);
 978                 return;
 979         }
 980
 981         /* handle oob callback */
 982         if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
 983                 dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n");
 984                 spin_lock_irqsave(&priv->dp_port_lock, flags);
 985                 priv->dp_write_urb_in_use = 0;
 986                 wake_up_interruptible(&priv->write_wait);
 987                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 988                 return;
 989         }
 990
 991         /* try to send any buffered data on this port */
 992         wakeup = true;
 993         spin_lock_irqsave(&priv->dp_port_lock, flags);
 994         priv->dp_write_urb_in_use = 0;
 995         if (priv->dp_out_buf_len > 0) {
 996                 *((unsigned char *)(port->write_urb->transfer_buffer))
 997                         = (unsigned char)DIGI_CMD_SEND_DATA;
 998                 *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
 999                         = (unsigned char)priv->dp_out_buf_len;
1000                 port->write_urb->transfer_buffer_length =
1001                                                 priv->dp_out_buf_len + 2;
1002                 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1003                         priv->dp_out_buf_len);
1004                 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1005                 if (ret == 0) {
1006                         priv->dp_write_urb_in_use = 1;
1007                         priv->dp_out_buf_len = 0;
1008                         wakeup = false;
1009                 }
1010         }
1011         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1012
1013         if (ret && ret != -EPERM)
1014                 dev_err_console(port,
1015                         "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1016                         __func__, ret, priv->dp_port_num);
1017
1018         if (wakeup)
1019                 tty_port_tty_wakeup(&port->port);
1020 }
1021
1022 static unsigned int digi_write_room(struct tty_struct *tty)
1023 {
1024         struct usb_serial_port *port = tty->driver_data;
1025         struct digi_port *priv = usb_get_serial_port_data(port);
1026         unsigned long flags;
1027         unsigned int room;
1028
1029         spin_lock_irqsave(&priv->dp_port_lock, flags);
1030
1031         if (priv->dp_write_urb_in_use)
1032                 room = 0;
1033         else
1034                 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1035
1036         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1037         dev_dbg(&port->dev, "digi_write_room: port=%d, room=%u\n", priv->dp_port_num, room);
1038         return room;
1039
1040 }
1041
1042 static unsigned int digi_chars_in_buffer(struct tty_struct *tty)
1043 {
1044         struct usb_serial_port *port = tty->driver_data;
1045         struct digi_port *priv = usb_get_serial_port_data(port);
1046         unsigned long flags;
1047         unsigned int chars;
1048
1049         spin_lock_irqsave(&priv->dp_port_lock, flags);
1050         if (priv->dp_write_urb_in_use)
1051                 chars = port->bulk_out_size - 2;
1052         else
1053                 chars = priv->dp_out_buf_len;
1054         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1055
1056         dev_dbg(&port->dev, "%s: port=%d, chars=%d\n", __func__,
1057                         priv->dp_port_num, chars);
1058         return chars;
1059 }
1060
1061 static void digi_dtr_rts(struct usb_serial_port *port, int on)
1062 {
1063         /* Adjust DTR and RTS */
1064         digi_set_modem_signals(port, on * (TIOCM_DTR | TIOCM_RTS), 1);
1065 }
1066
1067 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1068 {
1069         int ret;
1070         unsigned char buf[32];
1071         struct digi_port *priv = usb_get_serial_port_data(port);
1072         struct ktermios not_termios;
1073
1074         /* be sure the device is started up */
1075         if (digi_startup_device(port->serial) != 0)
1076                 return -ENXIO;
1077
1078         /* read modem signals automatically whenever they change */
1079         buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1080         buf[1] = priv->dp_port_num;
1081         buf[2] = DIGI_ENABLE;
1082         buf[3] = 0;
1083
1084         /* flush fifos */
1085         buf[4] = DIGI_CMD_IFLUSH_FIFO;
1086         buf[5] = priv->dp_port_num;
1087         buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1088         buf[7] = 0;
1089
1090         ret = digi_write_oob_command(port, buf, 8, 1);
1091         if (ret != 0)
1092                 dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);
1093
1094         /* set termios settings */
1095         if (tty) {
1096                 not_termios.c_cflag = ~tty->termios.c_cflag;
1097                 not_termios.c_iflag = ~tty->termios.c_iflag;
1098                 digi_set_termios(tty, port, &not_termios);
1099         }
1100         return 0;
1101 }
1102
1103
1104 static void digi_close(struct usb_serial_port *port)
1105 {
1106         DEFINE_WAIT(wait);
1107         int ret;
1108         unsigned char buf[32];
1109         struct digi_port *priv = usb_get_serial_port_data(port);
1110
1111         mutex_lock(&port->serial->disc_mutex);
1112         /* if disconnected, just clear flags */
1113         if (port->serial->disconnected)
1114                 goto exit;
1115
1116         /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1117         digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1118
1119         /* disable input flow control */
1120         buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1121         buf[1] = priv->dp_port_num;
1122         buf[2] = DIGI_DISABLE;
1123         buf[3] = 0;
1124
1125         /* disable output flow control */
1126         buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1127         buf[5] = priv->dp_port_num;
1128         buf[6] = DIGI_DISABLE;
1129         buf[7] = 0;
1130
1131         /* disable reading modem signals automatically */
1132         buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1133         buf[9] = priv->dp_port_num;
1134         buf[10] = DIGI_DISABLE;
1135         buf[11] = 0;
1136
1137         /* disable receive */
1138         buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1139         buf[13] = priv->dp_port_num;
1140         buf[14] = DIGI_DISABLE;
1141         buf[15] = 0;
1142
1143         /* flush fifos */
1144         buf[16] = DIGI_CMD_IFLUSH_FIFO;
1145         buf[17] = priv->dp_port_num;
1146         buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1147         buf[19] = 0;
1148
1149         ret = digi_write_oob_command(port, buf, 20, 0);
1150         if (ret != 0)
1151                 dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n",
1152                                                                         ret);
1153         /* wait for final commands on oob port to complete */
1154         prepare_to_wait(&priv->dp_flush_wait, &wait,
1155                         TASK_INTERRUPTIBLE);
1156         schedule_timeout(DIGI_CLOSE_TIMEOUT);
1157         finish_wait(&priv->dp_flush_wait, &wait);
1158
1159         /* shutdown any outstanding bulk writes */
1160         usb_kill_urb(port->write_urb);
1161 exit:
1162         spin_lock_irq(&priv->dp_port_lock);
1163         priv->dp_write_urb_in_use = 0;
1164         wake_up_interruptible(&priv->dp_close_wait);
1165         spin_unlock_irq(&priv->dp_port_lock);
1166         mutex_unlock(&port->serial->disc_mutex);
1167 }
1168
1169
1170 /*
1171  *  Digi Startup Device
1172  *
1173  *  Starts reads on all ports.  Must be called AFTER startup, with
1174  *  urbs initialized.  Returns 0 if successful, non-zero error otherwise.
1175  */
1176
1177 static int digi_startup_device(struct usb_serial *serial)
1178 {
1179         int i, ret = 0;
1180         struct digi_serial *serial_priv = usb_get_serial_data(serial);
1181         struct usb_serial_port *port;
1182
1183         /* be sure this happens exactly once */
1184         spin_lock(&serial_priv->ds_serial_lock);
1185         if (serial_priv->ds_device_started) {
1186                 spin_unlock(&serial_priv->ds_serial_lock);
1187                 return 0;
1188         }
1189         serial_priv->ds_device_started = 1;
1190         spin_unlock(&serial_priv->ds_serial_lock);
1191
1192         /* start reading from each bulk in endpoint for the device */
1193         /* set USB_DISABLE_SPD flag for write bulk urbs */
1194         for (i = 0; i < serial->type->num_ports + 1; i++) {
1195                 port = serial->port[i];
1196                 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1197                 if (ret != 0) {
1198                         dev_err(&port->dev,
1199                                 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1200                                 __func__, ret, i);
1201                         break;
1202                 }
1203         }
1204         return ret;
1205 }
1206
1207 static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
1208 {
1209         struct digi_port *priv;
1210
1211         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1212         if (!priv)
1213                 return -ENOMEM;
1214
1215         spin_lock_init(&priv->dp_port_lock);
1216         priv->dp_port_num = port_num;
1217         init_waitqueue_head(&priv->dp_transmit_idle_wait);
1218         init_waitqueue_head(&priv->dp_flush_wait);
1219         init_waitqueue_head(&priv->dp_close_wait);
1220         init_waitqueue_head(&priv->write_wait);
1221         priv->dp_port = port;
1222
1223         usb_set_serial_port_data(port, priv);
1224
1225         return 0;
1226 }
1227
1228 static int digi_startup(struct usb_serial *serial)
1229 {
1230         struct digi_serial *serial_priv;
1231         int ret;
1232
1233         serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
1234         if (!serial_priv)
1235                 return -ENOMEM;
1236
1237         spin_lock_init(&serial_priv->ds_serial_lock);
1238         serial_priv->ds_oob_port_num = serial->type->num_ports;
1239         serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1240
1241         ret = digi_port_init(serial_priv->ds_oob_port,
1242                                                 serial_priv->ds_oob_port_num);
1243         if (ret) {
1244                 kfree(serial_priv);
1245                 return ret;
1246         }
1247
1248         usb_set_serial_data(serial, serial_priv);
1249
1250         return 0;
1251 }
1252
1253
1254 static void digi_disconnect(struct usb_serial *serial)
1255 {
1256         int i;
1257
1258         /* stop reads and writes on all ports */
1259         for (i = 0; i < serial->type->num_ports + 1; i++) {
1260                 usb_kill_urb(serial->port[i]->read_urb);
1261                 usb_kill_urb(serial->port[i]->write_urb);
1262         }
1263 }
1264
1265
1266 static void digi_release(struct usb_serial *serial)
1267 {
1268         struct digi_serial *serial_priv;
1269         struct digi_port *priv;
1270
1271         serial_priv = usb_get_serial_data(serial);
1272
1273         priv = usb_get_serial_port_data(serial_priv->ds_oob_port);
1274         kfree(priv);
1275
1276         kfree(serial_priv);
1277 }
1278
1279 static int digi_port_probe(struct usb_serial_port *port)
1280 {
1281         return digi_port_init(port, port->port_number);
1282 }
1283
1284 static void digi_port_remove(struct usb_serial_port *port)
1285 {
1286         struct digi_port *priv;
1287
1288         priv = usb_get_serial_port_data(port);
1289         kfree(priv);
1290 }
1291
1292 static void digi_read_bulk_callback(struct urb *urb)
1293 {
1294         struct usb_serial_port *port = urb->context;
1295         struct digi_port *priv;
1296         struct digi_serial *serial_priv;
1297         int ret;
1298         int status = urb->status;
1299
1300         /* port sanity check, do not resubmit if port is not valid */
1301         if (port == NULL)
1302                 return;
1303         priv = usb_get_serial_port_data(port);
1304         if (priv == NULL) {
1305                 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1306                         __func__, status);
1307                 return;
1308         }
1309         if (port->serial == NULL ||
1310                 (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1311                 dev_err(&port->dev, "%s: serial is bad or serial->private "
1312                         "is NULL, status=%d\n", __func__, status);
1313                 return;
1314         }
1315
1316         /* do not resubmit urb if it has any status error */
1317         if (status) {
1318                 dev_err(&port->dev,
1319                         "%s: nonzero read bulk status: status=%d, port=%d\n",
1320                         __func__, status, priv->dp_port_num);
1321                 return;
1322         }
1323
1324         /* handle oob or inb callback, do not resubmit if error */
1325         if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1326                 if (digi_read_oob_callback(urb) != 0)
1327                         return;
1328         } else {
1329                 if (digi_read_inb_callback(urb) != 0)
1330                         return;
1331         }
1332
1333         /* continue read */
1334         ret = usb_submit_urb(urb, GFP_ATOMIC);
1335         if (ret != 0 && ret != -EPERM) {
1336                 dev_err(&port->dev,
1337                         "%s: failed resubmitting urb, ret=%d, port=%d\n",
1338                         __func__, ret, priv->dp_port_num);
1339         }
1340
1341 }
1342
1343 /*
1344  *  Digi Read INB Callback
1345  *
1346  *  Digi Read INB Callback handles reads on the in band ports, sending
1347  *  the data on to the tty subsystem.  When called we know port and
1348  *  port->private are not NULL and port->serial has been validated.
1349  *  It returns 0 if successful, 1 if successful but the port is
1350  *  throttled, and -1 if the sanity checks failed.
1351  */
1352
1353 static int digi_read_inb_callback(struct urb *urb)
1354 {
1355         struct usb_serial_port *port = urb->context;
1356         struct digi_port *priv = usb_get_serial_port_data(port);
1357         unsigned char *buf = urb->transfer_buffer;
1358         unsigned long flags;
1359         int opcode;
1360         int len;
1361         int port_status;
1362         unsigned char *data;
1363         int tty_flag, throttled;
1364
1365         /* short/multiple packet check */
1366         if (urb->actual_length < 2) {
1367                 dev_warn(&port->dev, "short packet received\n");
1368                 return -1;
1369         }
1370
1371         opcode = buf[0];
1372         len = buf[1];
1373
1374         if (urb->actual_length != len + 2) {
1375                 dev_err(&port->dev, "malformed packet received: port=%d, opcode=%d, len=%d, actual_length=%u\n",
1376                         priv->dp_port_num, opcode, len, urb->actual_length);
1377                 return -1;
1378         }
1379
1380         if (opcode == DIGI_CMD_RECEIVE_DATA && len < 1) {
1381                 dev_err(&port->dev, "malformed data packet received\n");
1382                 return -1;
1383         }
1384
1385         spin_lock_irqsave(&priv->dp_port_lock, flags);
1386
1387         /* check for throttle; if set, do not resubmit read urb */
1388         /* indicate the read chain needs to be restarted on unthrottle */
1389         throttled = priv->dp_throttled;
1390         if (throttled)
1391                 priv->dp_throttle_restart = 1;
1392
1393         /* receive data */
1394         if (opcode == DIGI_CMD_RECEIVE_DATA) {
1395                 port_status = buf[2];
1396                 data = &buf[3];
1397
1398                 /* get flag from port_status */
1399                 tty_flag = 0;
1400
1401                 /* overrun is special, not associated with a char */
1402                 if (port_status & DIGI_OVERRUN_ERROR)
1403                         tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1404
1405                 /* break takes precedence over parity, */
1406                 /* which takes precedence over framing errors */
1407                 if (port_status & DIGI_BREAK_ERROR)
1408                         tty_flag = TTY_BREAK;
1409                 else if (port_status & DIGI_PARITY_ERROR)
1410                         tty_flag = TTY_PARITY;
1411                 else if (port_status & DIGI_FRAMING_ERROR)
1412                         tty_flag = TTY_FRAME;
1413
1414                 /* data length is len-1 (one byte of len is port_status) */
1415                 --len;
1416                 if (len > 0) {
1417                         tty_insert_flip_string_fixed_flag(&port->port, data,
1418                                         tty_flag, len);
1419                         tty_flip_buffer_push(&port->port);
1420                 }
1421         }
1422         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1423
1424         if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1425                 dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__);
1426         else if (opcode != DIGI_CMD_RECEIVE_DATA)
1427                 dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode);
1428
1429         return throttled ? 1 : 0;
1430
1431 }
1432
1433
1434 /*
1435  *  Digi Read OOB Callback
1436  *
1437  *  Digi Read OOB Callback handles reads on the out of band port.
1438  *  When called we know port and port->private are not NULL and
1439  *  the port->serial is valid.  It returns 0 if successful, and
1440  *  -1 if the sanity checks failed.
1441  */
1442
1443 static int digi_read_oob_callback(struct urb *urb)
1444 {
1445
1446         struct usb_serial_port *port = urb->context;
1447         struct usb_serial *serial = port->serial;
1448         struct tty_struct *tty;
1449         struct digi_port *priv;
1450         unsigned char *buf = urb->transfer_buffer;
1451         int opcode, line, status, val;
1452         unsigned long flags;
1453         int i;
1454         unsigned int rts;
1455
1456         if (urb->actual_length < 4)
1457                 return -1;
1458
1459         /* handle each oob command */
1460         for (i = 0; i < urb->actual_length - 3; i += 4) {
1461                 opcode = buf[i];
1462                 line = buf[i + 1];
1463                 status = buf[i + 2];
1464                 val = buf[i + 3];
1465
1466                 dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",
1467                         opcode, line, status, val);
1468
1469                 if (status != 0 || line >= serial->type->num_ports)
1470                         continue;
1471
1472                 port = serial->port[line];
1473
1474                 priv = usb_get_serial_port_data(port);
1475                 if (priv == NULL)
1476                         return -1;
1477
1478                 tty = tty_port_tty_get(&port->port);
1479
1480                 rts = 0;
1481                 if (tty)
1482                         rts = C_CRTSCTS(tty);
1483
1484                 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1485                         bool wakeup = false;
1486
1487                         spin_lock_irqsave(&priv->dp_port_lock, flags);
1488                         /* convert from digi flags to termiox flags */
1489                         if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1490                                 priv->dp_modem_signals |= TIOCM_CTS;
1491                                 if (rts)
1492                                         wakeup = true;
1493                         } else {
1494                                 priv->dp_modem_signals &= ~TIOCM_CTS;
1495                                 /* port must be open to use tty struct */
1496                         }
1497                         if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1498                                 priv->dp_modem_signals |= TIOCM_DSR;
1499                         else
1500                                 priv->dp_modem_signals &= ~TIOCM_DSR;
1501                         if (val & DIGI_READ_INPUT_SIGNALS_RI)
1502                                 priv->dp_modem_signals |= TIOCM_RI;
1503                         else
1504                                 priv->dp_modem_signals &= ~TIOCM_RI;
1505                         if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1506                                 priv->dp_modem_signals |= TIOCM_CD;
1507                         else
1508                                 priv->dp_modem_signals &= ~TIOCM_CD;
1509
1510                         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1511
1512                         if (wakeup)
1513                                 tty_port_tty_wakeup(&port->port);
1514                 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1515                         spin_lock_irqsave(&priv->dp_port_lock, flags);
1516                         priv->dp_transmit_idle = 1;
1517                         wake_up_interruptible(&priv->dp_transmit_idle_wait);
1518                         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1519                 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1520                         wake_up_interruptible(&priv->dp_flush_wait);
1521                 }
1522                 tty_kref_put(tty);
1523         }
1524         return 0;
1525
1526 }
1527
1528 module_usb_serial_driver(serial_drivers, id_table_combined);
1529
1530 MODULE_AUTHOR(DRIVER_AUTHOR);
1531 MODULE_DESCRIPTION(DRIVER_DESC);
1532 MODULE_LICENSE("GPL");