err.no Git - linux-2.6/blob - 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 * (12/03/2001) gkh
  18 *       switched to using port->open_count instead of private version.
  19 *       Removed port->active
  20 *
  21 * (04/08/2001) gb
  22 *       Identify version on module load.
  23 *
  24 * (11/01/2000) Adam J. Richter
  25 *       usb_device_id table support
  26 *
  27 * (11/01/2000) pberger and borchers
  28 *    -- Turned off the USB_DISABLE_SPD flag for write bulk urbs--it caused
  29 *       USB 4 ports to hang on startup.
  30 *    -- Serialized access to write urbs by adding the dp_write_urb_in_use
  31 *       flag; otherwise, the driver caused SMP system hangs.  Watching the
  32 *       urb status is not sufficient.
  33 *
  34 * (10/05/2000) gkh
  35 *    -- Fixed bug with urb->dev not being set properly, now that the usb
  36 *       core needs it.
  37 *
  38 *  (8/8/2000) pberger and borchers
  39 *    -- Fixed close so that
  40 *       - it can timeout while waiting for transmit idle, if needed;
  41 *       - it ignores interrupts when flushing the port, turning
  42 *         of modem signalling, and so on;
  43 *       - it waits for the flush to really complete before returning.
  44 *    -- Read_bulk_callback and write_bulk_callback check for a closed
  45 *       port before using the tty struct or writing to the port.
  46 *    -- The two changes above fix the oops caused by interrupted closes.
  47 *    -- Added interruptible args to write_oob_command and set_modem_signals
  48 *       and added a timeout arg to transmit_idle; needed for fixes to
  49 *       close.
  50 *    -- Added code for rx_throttle and rx_unthrottle so that input flow
  51 *       control works.
  52 *    -- Added code to set overrun, parity, framing, and break errors
  53 *       (untested).
  54 *    -- Set USB_DISABLE_SPD flag for write bulk urbs, so no 0 length
  55 *       bulk writes are done.  These hung the Digi USB device.  The
  56 *       0 length bulk writes were a new feature of usb-uhci added in
  57 *       the 2.4.0-test6 kernels.
  58 *    -- Fixed mod inc race in open; do mod inc before sleeping to wait
  59 *       for a close to finish.
  60 *
  61 *  (7/31/2000) pberger
  62 *    -- Fixed bugs with hardware handshaking:
  63 *       - Added code to set/clear tty->hw_stopped in digi_read_oob_callback()
  64 *         and digi_set_termios()
  65 *    -- Added code in digi_set_termios() to
  66 *       - add conditional in code handling transition from B0 to only
  67 *         set RTS if RTS/CTS flow control is either not in use or if
  68 *         the port is not currently throttled.
  69 *       - handle turning off CRTSCTS.
  70 *
  71 *  (7/30/2000) borchers
  72 *    -- Added support for more than one Digi USB device by moving
  73 *       globals to a private structure in the pointed to from the
  74 *       usb_serial structure.
  75 *    -- Moved the modem change and transmit idle wait queues into
  76 *       the port private structure, so each port has its own queue
  77 *       rather than sharing global queues.
  78 *    -- Added support for break signals.
  79 *
  80 *  (7/25/2000) pberger
  81 *    -- Added USB-2 support.  Note: the USB-2 supports 3 devices: two
  82 *       serial and a parallel port.  The parallel port is implemented
  83 *       as a serial-to-parallel converter.  That is, the driver actually
  84 *       presents all three USB-2 interfaces as serial ports, but the third
  85 *       one physically connects to a parallel device.  Thus, for example,
  86 *       one could plug a parallel printer into the USB-2's third port,
  87 *       but from the kernel's (and userland's) point of view what's
  88 *       actually out there is a serial device.
  89 *
  90 *  (7/15/2000) borchers
  91 *    -- Fixed race in open when a close is in progress.
  92 *    -- Keep count of opens and dec the module use count for each
  93 *       outstanding open when shutdown is called (on disconnect).
  94 *    -- Fixed sanity checks in read_bulk_callback and write_bulk_callback
  95 *       so pointers are checked before use.
  96 *    -- Split read bulk callback into in band and out of band
  97 *       callbacks, and no longer restart read chains if there is
  98 *       a status error or a sanity error.  This fixed the seg
  99 *       faults and other errors we used to get on disconnect.
 100 *    -- Port->active is once again a flag as usb-serial intended it
 101 *       to be, not a count.  Since it was only a char it would
 102 *       have been limited to 256 simultaneous opens.  Now the open
 103 *       count is kept in the port private structure in dp_open_count.
 104 *    -- Added code for modularization of the digi_acceleport driver.
 105 *
 106 *  (6/27/2000) pberger and borchers
 107 *    -- Zeroed out sync field in the wakeup_task before first use;
 108 *       otherwise the uninitialized value might prevent the task from
 109 *       being scheduled.
 110 *    -- Initialized ret value to 0 in write_bulk_callback, otherwise
 111 *       the uninitialized value could cause a spurious debugging message.
 112 *
 113 *  (6/22/2000) pberger and borchers
 114 *    -- Made cond_wait_... inline--apparently on SPARC the flags arg
 115 *       to spin_lock_irqsave cannot be passed to another function
 116 *       to call spin_unlock_irqrestore.  Thanks to Pauline Middelink.
 117 *    -- In digi_set_modem_signals the inner nested spin locks use just
 118 *       spin_lock() rather than spin_lock_irqsave().  The old code
 119 *       mistakenly left interrupts off.  Thanks to Pauline Middelink.
 120 *    -- copy_from_user (which can sleep) is no longer called while a
 121 *       spinlock is held.  We copy to a local buffer before getting
 122 *       the spinlock--don't like the extra copy but the code is simpler.
 123 *    -- Printk and dbg are no longer called while a spin lock is held.
 124 *
 125 *  (6/4/2000) pberger and borchers
 126 *    -- Replaced separate calls to spin_unlock_irqrestore and
 127 *       interruptible_sleep_on_timeout with a new function
 128 *       cond_wait_interruptible_timeout_irqrestore.  This eliminates
 129 *       the race condition where the wake up could happen after
 130 *       the unlock and before the sleep.
 131 *    -- Close now waits for output to drain.
 132 *    -- Open waits until any close in progress is finished.
 133 *    -- All out of band responses are now processed, not just the
 134 *       first in a USB packet.
 135 *    -- Fixed a bug that prevented the driver from working when the
 136 *       first Digi port was not the first USB serial port--the driver
 137 *       was mistakenly using the external USB serial port number to
 138 *       try to index into its internal ports.
 139 *    -- Fixed an SMP bug -- write_bulk_callback is called directly from
 140 *       an interrupt, so spin_lock_irqsave/spin_unlock_irqrestore are
 141 *       needed for locks outside write_bulk_callback that are also
 142 *       acquired by write_bulk_callback to prevent deadlocks.
 143 *    -- Fixed support for select() by making digi_chars_in_buffer()
 144 *       return 256 when -EINPROGRESS is set, as the line discipline
 145 *       code in n_tty.c expects.
 146 *    -- Fixed an include file ordering problem that prevented debugging
 147 *       messages from working.
 148 *    -- Fixed an intermittent timeout problem that caused writes to
 149 *       sometimes get stuck on some machines on some kernels.  It turns
 150 *       out in these circumstances write_chan() (in n_tty.c) was
 151 *       asleep waiting for our wakeup call.  Even though we call
 152 *       wake_up_interruptible() in digi_write_bulk_callback(), there is
 153 *       a race condition that could cause the wakeup to fail: if our
 154 *       wake_up_interruptible() call occurs between the time that our
 155 *       driver write routine finishes and write_chan() sets current->state
 156 *       to TASK_INTERRUPTIBLE, the effect of our wakeup setting the state
 157 *       to TASK_RUNNING will be lost and write_chan's subsequent call to
 158 *       schedule() will never return (unless it catches a signal).
 159 *       This race condition occurs because write_bulk_callback() (and thus
 160 *       the wakeup) are called asynchronously from an interrupt, rather than
 161 *       from the scheduler.  We can avoid the race by calling the wakeup
 162 *       from the scheduler queue and that's our fix:  Now, at the end of
 163 *       write_bulk_callback() we queue up a wakeup call on the scheduler
 164 *       task queue.  We still also invoke the wakeup directly since that
 165 *       squeezes a bit more performance out of the driver, and any lost
 166 *       race conditions will get cleaned up at the next scheduler run.
 167 *
 168 *       NOTE:  The problem also goes away if you comment out
 169 *       the two code lines in write_chan() where current->state
 170 *       is set to TASK_RUNNING just before calling driver.write() and to
 171 *       TASK_INTERRUPTIBLE immediately afterwards.  This is why the
 172 *       problem did not show up with the 2.2 kernels -- they do not
 173 *       include that code.
 174 *
 175 *  (5/16/2000) pberger and borchers
 176 *    -- Added timeouts to sleeps, to defend against lost wake ups.
 177 *    -- Handle transition to/from B0 baud rate in digi_set_termios.
 178 *
 179 *  (5/13/2000) pberger and borchers
 180 *    -- All commands now sent on out of band port, using
 181 *       digi_write_oob_command.
 182 *    -- Get modem control signals whenever they change, support TIOCMGET/
 183 *       SET/BIS/BIC ioctls.
 184 *    -- digi_set_termios now supports parity, word size, stop bits, and
 185 *       receive enable.
 186 *    -- Cleaned up open and close, use digi_set_termios and
 187 *       digi_write_oob_command to set port parameters.
 188 *    -- Added digi_startup_device to start read chains on all ports.
 189 *    -- Write buffer is only used when count==1, to be sure put_char can
 190 *       write a char (unless the buffer is full).
 191 *
 192 *  (5/10/2000) pberger and borchers
 193 *    -- Added MOD_INC_USE_COUNT/MOD_DEC_USE_COUNT calls on open/close.
 194 *    -- Fixed problem where the first incoming character is lost on
 195 *       port opens after the first close on that port.  Now we keep
 196 *       the read_urb chain open until shutdown.
 197 *    -- Added more port conditioning calls in digi_open and digi_close.
 198 *    -- Convert port->active to a use count so that we can deal with multiple
 199 *       opens and closes properly.
 200 *    -- Fixed some problems with the locking code.
 201 *
 202 *  (5/3/2000) pberger and borchers
 203 *    -- First alpha version of the driver--many known limitations and bugs.
 204 *
 205 *
 206 *  Locking and SMP
 207 *
 208 *  - Each port, including the out-of-band port, has a lock used to
 209 *    serialize all access to the port's private structure.
 210 *  - The port lock is also used to serialize all writes and access to
 211 *    the port's URB.
 212 *  - The port lock is also used for the port write_wait condition
 213 *    variable.  Holding the port lock will prevent a wake up on the
 214 *    port's write_wait; this can be used with cond_wait_... to be sure
 215 *    the wake up is not lost in a race when dropping the lock and
 216 *    sleeping waiting for the wakeup.
 217 *  - digi_write() does not sleep, since it is sometimes called on
 218 *    interrupt time.
 219 *  - digi_write_bulk_callback() and digi_read_bulk_callback() are
 220 *    called directly from interrupts.  Hence spin_lock_irqsave()
 221 *    and spin_unlock_irqrestore() are used in the rest of the code
 222 *    for any locks they acquire.
 223 *  - digi_write_bulk_callback() gets the port lock before waking up
 224 *    processes sleeping on the port write_wait.  It also schedules
 225 *    wake ups so they happen from the scheduler, because the tty
 226 *    system can miss wake ups from interrupts.
 227 *  - All sleeps use a timeout of DIGI_RETRY_TIMEOUT before looping to
 228 *    recheck the condition they are sleeping on.  This is defensive,
 229 *    in case a wake up is lost.
 230 *  - Following Documentation/DocBook/kernel-locking.pdf no spin locks
 231 *    are held when calling copy_to/from_user or printk.
 232 *
 233 *  $Id: digi_acceleport.c,v 1.80.1.2 2000/11/02 05:45:08 root Exp $
 234 */
 235
 236 #include <linux/kernel.h>
 237 #include <linux/errno.h>
 238 #include <linux/init.h>
 239 #include <linux/slab.h>
 240 #include <linux/tty.h>
 241 #include <linux/tty_driver.h>
 242 #include <linux/tty_flip.h>
 243 #include <linux/module.h>
 244 #include <linux/spinlock.h>
 245 #include <linux/workqueue.h>
 246 #include <asm/uaccess.h>
 247 #include <linux/usb.h>
 248 #include <linux/wait.h>
 249 #include <linux/usb/serial.h>
 250
 251 /* Defines */
 252
 253 /*
 254  * Version Information
 255  */
 256 #define DRIVER_VERSION "v1.80.1.2"
 257 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
 258 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
 259
 260 /* port output buffer length -- must be <= transfer buffer length - 2 */
 261 /* so we can be sure to send the full buffer in one urb */
 262 #define DIGI_OUT_BUF_SIZE               8
 263
 264 /* port input buffer length -- must be >= transfer buffer length - 3 */
 265 /* so we can be sure to hold at least one full buffer from one urb */
 266 #define DIGI_IN_BUF_SIZE                64
 267
 268 /* retry timeout while sleeping */
 269 #define DIGI_RETRY_TIMEOUT              (HZ/10)
 270
 271 /* timeout while waiting for tty output to drain in close */
 272 /* this delay is used twice in close, so the total delay could */
 273 /* be twice this value */
 274 #define DIGI_CLOSE_TIMEOUT              (5*HZ)
 275
 276
 277 /* AccelePort USB Defines */
 278
 279 /* ids */
 280 #define DIGI_VENDOR_ID                  0x05c5
 281 #define DIGI_2_ID                       0x0002  /* USB-2 */
 282 #define DIGI_4_ID                       0x0004  /* USB-4 */
 283
 284 /* commands
 285  * "INB": can be used on the in-band endpoint
 286  * "OOB": can be used on the out-of-band endpoint
 287  */
 288 #define DIGI_CMD_SET_BAUD_RATE                  0       /* INB, OOB */
 289 #define DIGI_CMD_SET_WORD_SIZE                  1       /* INB, OOB */
 290 #define DIGI_CMD_SET_PARITY                     2       /* INB, OOB */
 291 #define DIGI_CMD_SET_STOP_BITS                  3       /* INB, OOB */
 292 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL         4       /* INB, OOB */
 293 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL        5       /* INB, OOB */
 294 #define DIGI_CMD_SET_DTR_SIGNAL                 6       /* INB, OOB */
 295 #define DIGI_CMD_SET_RTS_SIGNAL                 7       /* INB, OOB */
 296 #define DIGI_CMD_READ_INPUT_SIGNALS             8       /*      OOB */
 297 #define DIGI_CMD_IFLUSH_FIFO                    9       /*      OOB */
 298 #define DIGI_CMD_RECEIVE_ENABLE                 10      /* INB, OOB */
 299 #define DIGI_CMD_BREAK_CONTROL                  11      /* INB, OOB */
 300 #define DIGI_CMD_LOCAL_LOOPBACK                 12      /* INB, OOB */
 301 #define DIGI_CMD_TRANSMIT_IDLE                  13      /* INB, OOB */
 302 #define DIGI_CMD_READ_UART_REGISTER             14      /*      OOB */
 303 #define DIGI_CMD_WRITE_UART_REGISTER            15      /* INB, OOB */
 304 #define DIGI_CMD_AND_UART_REGISTER              16      /* INB, OOB */
 305 #define DIGI_CMD_OR_UART_REGISTER               17      /* INB, OOB */
 306 #define DIGI_CMD_SEND_DATA                      18      /* INB      */
 307 #define DIGI_CMD_RECEIVE_DATA                   19      /* INB      */
 308 #define DIGI_CMD_RECEIVE_DISABLE                20      /* INB      */
 309 #define DIGI_CMD_GET_PORT_TYPE                  21      /*      OOB */
 310
 311 /* baud rates */
 312 #define DIGI_BAUD_50                            0
 313 #define DIGI_BAUD_75                            1
 314 #define DIGI_BAUD_110                           2
 315 #define DIGI_BAUD_150                           3
 316 #define DIGI_BAUD_200                           4
 317 #define DIGI_BAUD_300                           5
 318 #define DIGI_BAUD_600                           6
 319 #define DIGI_BAUD_1200                          7
 320 #define DIGI_BAUD_1800                          8
 321 #define DIGI_BAUD_2400                          9
 322 #define DIGI_BAUD_4800                          10
 323 #define DIGI_BAUD_7200                          11
 324 #define DIGI_BAUD_9600                          12
 325 #define DIGI_BAUD_14400                         13
 326 #define DIGI_BAUD_19200                         14
 327 #define DIGI_BAUD_28800                         15
 328 #define DIGI_BAUD_38400                         16
 329 #define DIGI_BAUD_57600                         17
 330 #define DIGI_BAUD_76800                         18
 331 #define DIGI_BAUD_115200                        19
 332 #define DIGI_BAUD_153600                        20
 333 #define DIGI_BAUD_230400                        21
 334 #define DIGI_BAUD_460800                        22
 335
 336 /* arguments */
 337 #define DIGI_WORD_SIZE_5                        0
 338 #define DIGI_WORD_SIZE_6                        1
 339 #define DIGI_WORD_SIZE_7                        2
 340 #define DIGI_WORD_SIZE_8                        3
 341
 342 #define DIGI_PARITY_NONE                        0
 343 #define DIGI_PARITY_ODD                         1
 344 #define DIGI_PARITY_EVEN                        2
 345 #define DIGI_PARITY_MARK                        3
 346 #define DIGI_PARITY_SPACE                       4
 347
 348 #define DIGI_STOP_BITS_1                        0
 349 #define DIGI_STOP_BITS_2                        1
 350
 351 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF        1
 352 #define DIGI_INPUT_FLOW_CONTROL_RTS             2
 353 #define DIGI_INPUT_FLOW_CONTROL_DTR             4
 354
 355 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF       1
 356 #define DIGI_OUTPUT_FLOW_CONTROL_CTS            2
 357 #define DIGI_OUTPUT_FLOW_CONTROL_DSR            4
 358
 359 #define DIGI_DTR_INACTIVE                       0
 360 #define DIGI_DTR_ACTIVE                         1
 361 #define DIGI_DTR_INPUT_FLOW_CONTROL             2
 362
 363 #define DIGI_RTS_INACTIVE                       0
 364 #define DIGI_RTS_ACTIVE                         1
 365 #define DIGI_RTS_INPUT_FLOW_CONTROL             2
 366 #define DIGI_RTS_TOGGLE                         3
 367
 368 #define DIGI_FLUSH_TX                           1
 369 #define DIGI_FLUSH_RX                           2
 370 #define DIGI_RESUME_TX                          4 /* clears xoff condition */
 371
 372 #define DIGI_TRANSMIT_NOT_IDLE                  0
 373 #define DIGI_TRANSMIT_IDLE                      1
 374
 375 #define DIGI_DISABLE                            0
 376 #define DIGI_ENABLE                             1
 377
 378 #define DIGI_DEASSERT                           0
 379 #define DIGI_ASSERT                             1
 380
 381 /* in band status codes */
 382 #define DIGI_OVERRUN_ERROR                      4
 383 #define DIGI_PARITY_ERROR                       8
 384 #define DIGI_FRAMING_ERROR                      16
 385 #define DIGI_BREAK_ERROR                        32
 386
 387 /* out of band status */
 388 #define DIGI_NO_ERROR                           0
 389 #define DIGI_BAD_FIRST_PARAMETER                1
 390 #define DIGI_BAD_SECOND_PARAMETER               2
 391 #define DIGI_INVALID_LINE                       3
 392 #define DIGI_INVALID_OPCODE                     4
 393
 394 /* input signals */
 395 #define DIGI_READ_INPUT_SIGNALS_SLOT            1
 396 #define DIGI_READ_INPUT_SIGNALS_ERR             2
 397 #define DIGI_READ_INPUT_SIGNALS_BUSY            4
 398 #define DIGI_READ_INPUT_SIGNALS_PE              8
 399 #define DIGI_READ_INPUT_SIGNALS_CTS             16
 400 #define DIGI_READ_INPUT_SIGNALS_DSR             32
 401 #define DIGI_READ_INPUT_SIGNALS_RI              64
 402 #define DIGI_READ_INPUT_SIGNALS_DCD             128
 403
 404
 405 /* Structures */
 406
 407 struct digi_serial {
 408         spinlock_t ds_serial_lock;
 409         struct usb_serial_port *ds_oob_port;    /* out-of-band port */
 410         int ds_oob_port_num;                    /* index of out-of-band port */
 411         int ds_device_started;
 412 };
 413
 414 struct digi_port {
 415         spinlock_t dp_port_lock;
 416         int dp_port_num;
 417         int dp_out_buf_len;
 418         unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
 419         int dp_write_urb_in_use;
 420         unsigned int dp_modem_signals;
 421         wait_queue_head_t dp_modem_change_wait;
 422         int dp_transmit_idle;
 423         wait_queue_head_t dp_transmit_idle_wait;
 424         int dp_throttled;
 425         int dp_throttle_restart;
 426         wait_queue_head_t dp_flush_wait;
 427         int dp_in_close;                        /* close in progress */
 428         wait_queue_head_t dp_close_wait;        /* wait queue for close */
 429         struct work_struct dp_wakeup_work;
 430         struct usb_serial_port *dp_port;
 431 };
 432
 433
 434 /* Local Function Declarations */
 435
 436 static void digi_wakeup_write(struct usb_serial_port *port);
 437 static void digi_wakeup_write_lock(struct work_struct *work);
 438 static int digi_write_oob_command(struct usb_serial_port *port,
 439         unsigned char *buf, int count, int interruptible);
 440 static int digi_write_inb_command(struct usb_serial_port *port,
 441         unsigned char *buf, int count, unsigned long timeout);
 442 static int digi_set_modem_signals(struct usb_serial_port *port,
 443         unsigned int modem_signals, int interruptible);
 444 static int digi_transmit_idle(struct usb_serial_port *port,
 445         unsigned long timeout);
 446 static void digi_rx_throttle (struct usb_serial_port *port);
 447 static void digi_rx_unthrottle (struct usb_serial_port *port);
 448 static void digi_set_termios(struct usb_serial_port *port,
 449         struct ktermios *old_termios);
 450 static void digi_break_ctl(struct usb_serial_port *port, int break_state);
 451 static int digi_ioctl(struct usb_serial_port *port, struct file *file,
 452         unsigned int cmd, unsigned long arg);
 453 static int digi_tiocmget(struct usb_serial_port *port, struct file *file);
 454 static int digi_tiocmset(struct usb_serial_port *port, struct file *file,
 455         unsigned int set, unsigned int clear);
 456 static int digi_write(struct usb_serial_port *port, const unsigned char *buf, int count);
 457 static void digi_write_bulk_callback(struct urb *urb);
 458 static int digi_write_room(struct usb_serial_port *port);
 459 static int digi_chars_in_buffer(struct usb_serial_port *port);
 460 static int digi_open(struct usb_serial_port *port, struct file *filp);
 461 static void digi_close(struct usb_serial_port *port, struct file *filp);
 462 static int digi_startup_device(struct usb_serial *serial);
 463 static int digi_startup(struct usb_serial *serial);
 464 static void digi_shutdown(struct usb_serial *serial);
 465 static void digi_read_bulk_callback(struct urb *urb);
 466 static int digi_read_inb_callback(struct urb *urb);
 467 static int digi_read_oob_callback(struct urb *urb);
 468
 469
 470 /* Statics */
 471
 472 static int debug;
 473
 474 static struct usb_device_id id_table_combined [] = {
 475         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
 476         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
 477         { }                                             /* Terminating entry */
 478 };
 479
 480 static struct usb_device_id id_table_2 [] = {
 481         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
 482         { }                                             /* Terminating entry */
 483 };
 484
 485 static struct usb_device_id id_table_4 [] = {
 486         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
 487         { }                                             /* Terminating entry */
 488 };
 489
 490 MODULE_DEVICE_TABLE (usb, id_table_combined);
 491
 492 static struct usb_driver digi_driver = {
 493         .name =         "digi_acceleport",
 494         .probe =        usb_serial_probe,
 495         .disconnect =   usb_serial_disconnect,
 496         .id_table =     id_table_combined,
 497         .no_dynamic_id =        1,
 498 };
 499
 500
 501 /* device info needed for the Digi serial converter */
 502
 503 static struct usb_serial_driver digi_acceleport_2_device = {
 504         .driver = {
 505                 .owner =                THIS_MODULE,
 506                 .name =                 "digi_2",
 507         },
 508         .description =                  "Digi 2 port USB adapter",
 509         .usb_driver =                   &digi_driver,
 510         .id_table =                     id_table_2,
 511         .num_interrupt_in =             0,
 512         .num_bulk_in =                  4,
 513         .num_bulk_out =                 4,
 514         .num_ports =                    3,
 515         .open =                         digi_open,
 516         .close =                        digi_close,
 517         .write =                        digi_write,
 518         .write_room =                   digi_write_room,
 519         .write_bulk_callback =          digi_write_bulk_callback,
 520         .read_bulk_callback =           digi_read_bulk_callback,
 521         .chars_in_buffer =              digi_chars_in_buffer,
 522         .throttle =                     digi_rx_throttle,
 523         .unthrottle =                   digi_rx_unthrottle,
 524         .ioctl =                        digi_ioctl,
 525         .set_termios =                  digi_set_termios,
 526         .break_ctl =                    digi_break_ctl,
 527         .tiocmget =                     digi_tiocmget,
 528         .tiocmset =                     digi_tiocmset,
 529         .attach =                       digi_startup,
 530         .shutdown =                     digi_shutdown,
 531 };
 532
 533 static struct usb_serial_driver digi_acceleport_4_device = {
 534         .driver = {
 535                 .owner =                THIS_MODULE,
 536                 .name =                 "digi_4",
 537         },
 538         .description =                  "Digi 4 port USB adapter",
 539         .usb_driver =                   &digi_driver,
 540         .id_table =                     id_table_4,
 541         .num_interrupt_in =             0,
 542         .num_bulk_in =                  5,
 543         .num_bulk_out =                 5,
 544         .num_ports =                    4,
 545         .open =                         digi_open,
 546         .close =                        digi_close,
 547         .write =                        digi_write,
 548         .write_room =                   digi_write_room,
 549         .write_bulk_callback =          digi_write_bulk_callback,
 550         .read_bulk_callback =           digi_read_bulk_callback,
 551         .chars_in_buffer =              digi_chars_in_buffer,
 552         .throttle =                     digi_rx_throttle,
 553         .unthrottle =                   digi_rx_unthrottle,
 554         .ioctl =                        digi_ioctl,
 555         .set_termios =                  digi_set_termios,
 556         .break_ctl =                    digi_break_ctl,
 557         .tiocmget =                     digi_tiocmget,
 558         .tiocmset =                     digi_tiocmset,
 559         .attach =                       digi_startup,
 560         .shutdown =                     digi_shutdown,
 561 };
 562
 563
 564 /* Functions */
 565
 566 /*
 567 *  Cond Wait Interruptible Timeout Irqrestore
 568 *
 569 *  Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
 570 *  so that wake ups are not lost if they occur between the unlock
 571 *  and the sleep.  In other words, spin_unlock_irqrestore and
 572 *  interruptible_sleep_on_timeout are "atomic" with respect to
 573 *  wake ups.  This is used to implement condition variables.
 574 *
 575 *  interruptible_sleep_on_timeout is deprecated and has been replaced
 576 *  with the equivalent code.
 577 */
 578
 579 static long cond_wait_interruptible_timeout_irqrestore(
 580         wait_queue_head_t *q, long timeout,
 581         spinlock_t *lock, unsigned long flags)
 582 {
 583         DEFINE_WAIT(wait);
 584
 585         prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
 586         spin_unlock_irqrestore(lock, flags);
 587         timeout = schedule_timeout(timeout);
 588         finish_wait(q, &wait);
 589
 590         return timeout;
 591 }
 592
 593
 594 /*
 595 *  Digi Wakeup Write
 596 *
 597 *  Wake up port, line discipline, and tty processes sleeping
 598 *  on writes.
 599 */
 600
 601 static void digi_wakeup_write_lock(struct work_struct *work)
 602 {
 603         struct digi_port *priv = container_of(work, struct digi_port, dp_wakeup_work);
 604         struct usb_serial_port *port = priv->dp_port;
 605         unsigned long flags;
 606
 607         spin_lock_irqsave(&priv->dp_port_lock, flags);
 608         digi_wakeup_write(port);
 609         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 610 }
 611
 612 static void digi_wakeup_write(struct usb_serial_port *port)
 613 {
 614         tty_wakeup(port->tty);
 615 }
 616
 617
 618 /*
 619 *  Digi Write OOB Command
 620 *
 621 *  Write commands on the out of band port.  Commands are 4
 622 *  bytes each, multiple commands can be sent at once, and
 623 *  no command will be split across USB packets.  Returns 0
 624 *  if successful, -EINTR if interrupted while sleeping and
 625 *  the interruptible flag is true, or a negative error
 626 *  returned by usb_submit_urb.
 627 */
 628
 629 static int digi_write_oob_command(struct usb_serial_port *port,
 630         unsigned char *buf, int count, int interruptible)
 631 {
 632
 633         int ret = 0;
 634         int len;
 635         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 636         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 637         unsigned long flags = 0;
 638
 639         dbg("digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count);
 640
 641         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 642         while(count > 0) {
 643                 while(oob_port->write_urb->status == -EINPROGRESS
 644                         || oob_priv->dp_write_urb_in_use) {
 645                         cond_wait_interruptible_timeout_irqrestore(
 646                                 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
 647                                 &oob_priv->dp_port_lock, flags);
 648                         if (interruptible && signal_pending(current))
 649                                 return -EINTR;
 650                         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 651                 }
 652
 653                 /* len must be a multiple of 4, so commands are not split */
 654                 len = min(count, oob_port->bulk_out_size);
 655                 if (len > 4)
 656                         len &= ~3;
 657                 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
 658                 oob_port->write_urb->transfer_buffer_length = len;
 659                 oob_port->write_urb->dev = port->serial->dev;
 660                 if ((ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0) {
 661                         oob_priv->dp_write_urb_in_use = 1;
 662                         count -= len;
 663                         buf += len;
 664                 }
 665         }
 666         spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
 667         if (ret)
 668                 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, ret);
 669         return ret;
 670
 671 }
 672
 673
 674 /*
 675 *  Digi Write In Band Command
 676 *
 677 *  Write commands on the given port.  Commands are 4
 678 *  bytes each, multiple commands can be sent at once, and
 679 *  no command will be split across USB packets.  If timeout
 680 *  is non-zero, write in band command will return after
 681 *  waiting unsuccessfully for the URB status to clear for
 682 *  timeout ticks.  Returns 0 if successful, or a negative
 683 *  error returned by digi_write.
 684 */
 685
 686 static int digi_write_inb_command(struct usb_serial_port *port,
 687         unsigned char *buf, int count, unsigned long timeout)
 688 {
 689         int ret = 0;
 690         int len;
 691         struct digi_port *priv = usb_get_serial_port_data(port);
 692         unsigned char *data = port->write_urb->transfer_buffer;
 693         unsigned long flags = 0;
 694
 695         dbg("digi_write_inb_command: TOP: port=%d, count=%d",
 696                 priv->dp_port_num, count);
 697
 698         if (timeout)
 699                 timeout += jiffies;
 700         else
 701                 timeout = ULONG_MAX;
 702
 703         spin_lock_irqsave(&priv->dp_port_lock, flags);
 704         while(count > 0 && ret == 0) {
 705                 while((port->write_urb->status == -EINPROGRESS
 706                         || priv->dp_write_urb_in_use) && time_before(jiffies, timeout)) {
 707                         cond_wait_interruptible_timeout_irqrestore(
 708                                 &port->write_wait, DIGI_RETRY_TIMEOUT,
 709                                 &priv->dp_port_lock, flags);
 710                         if (signal_pending(current))
 711                                 return -EINTR;
 712                         spin_lock_irqsave(&priv->dp_port_lock, flags);
 713                 }
 714
 715                 /* len must be a multiple of 4 and small enough to */
 716                 /* guarantee the write will send buffered data first, */
 717                 /* so commands are in order with data and not split */
 718                 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
 719                 if (len > 4)
 720                         len &= ~3;
 721
 722                 /* write any buffered data first */
 723                 if (priv->dp_out_buf_len > 0) {
 724                         data[0] = DIGI_CMD_SEND_DATA;
 725                         data[1] = priv->dp_out_buf_len;
 726                         memcpy(data + 2, priv->dp_out_buf,
 727                                 priv->dp_out_buf_len);
 728                         memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
 729                         port->write_urb->transfer_buffer_length
 730                                 = priv->dp_out_buf_len + 2 + len;
 731                 } else {
 732                         memcpy(data, buf, len);
 733                         port->write_urb->transfer_buffer_length = len;
 734                 }
 735                 port->write_urb->dev = port->serial->dev;
 736
 737                 if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0) {
 738                         priv->dp_write_urb_in_use = 1;
 739                         priv->dp_out_buf_len = 0;
 740                         count -= len;
 741                         buf += len;
 742                 }
 743
 744         }
 745         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 746
 747         if (ret)
 748                 err("%s: usb_submit_urb failed, ret=%d, port=%d",
 749                         __FUNCTION__, ret, priv->dp_port_num);
 750         return ret;
 751 }
 752
 753
 754 /*
 755 *  Digi Set Modem Signals
 756 *
 757 *  Sets or clears DTR and RTS on the port, according to the
 758 *  modem_signals argument.  Use TIOCM_DTR and TIOCM_RTS flags
 759 *  for the modem_signals argument.  Returns 0 if successful,
 760 *  -EINTR if interrupted while sleeping, or a non-zero error
 761 *  returned by usb_submit_urb.
 762 */
 763
 764 static int digi_set_modem_signals(struct usb_serial_port *port,
 765         unsigned int modem_signals, int interruptible)
 766 {
 767
 768         int ret;
 769         struct digi_port *port_priv = usb_get_serial_port_data(port);
 770         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 771         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 772         unsigned char *data = oob_port->write_urb->transfer_buffer;
 773         unsigned long flags = 0;
 774
 775
 776         dbg("digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
 777                 port_priv->dp_port_num, modem_signals);
 778
 779         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 780         spin_lock(&port_priv->dp_port_lock);
 781
 782         while(oob_port->write_urb->status == -EINPROGRESS || oob_priv->dp_write_urb_in_use) {
 783                 spin_unlock(&port_priv->dp_port_lock);
 784                 cond_wait_interruptible_timeout_irqrestore(
 785                         &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
 786                         &oob_priv->dp_port_lock, flags);
 787                 if (interruptible && signal_pending(current))
 788                         return -EINTR;
 789                 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 790                 spin_lock(&port_priv->dp_port_lock);
 791         }
 792         data[0] = DIGI_CMD_SET_DTR_SIGNAL;
 793         data[1] = port_priv->dp_port_num;
 794         data[2] = (modem_signals&TIOCM_DTR) ? DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
 795         data[3] = 0;
 796         data[4] = DIGI_CMD_SET_RTS_SIGNAL;
 797         data[5] = port_priv->dp_port_num;
 798         data[6] = (modem_signals&TIOCM_RTS) ? DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
 799         data[7] = 0;
 800
 801         oob_port->write_urb->transfer_buffer_length = 8;
 802         oob_port->write_urb->dev = port->serial->dev;
 803
 804         if ((ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0) {
 805                 oob_priv->dp_write_urb_in_use = 1;
 806                 port_priv->dp_modem_signals =
 807                         (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
 808                         | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
 809         }
 810         spin_unlock(&port_priv->dp_port_lock);
 811         spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
 812         if (ret)
 813                 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, ret);
 814         return ret;
 815 }
 816
 817 /*
 818 *  Digi Transmit Idle
 819 *
 820 *  Digi transmit idle waits, up to timeout ticks, for the transmitter
 821 *  to go idle.  It returns 0 if successful or a negative error.
 822 *
 823 *  There are race conditions here if more than one process is calling
 824 *  digi_transmit_idle on the same port at the same time.  However, this
 825 *  is only called from close, and only one process can be in close on a
 826 *  port at a time, so its ok.
 827 */
 828
 829 static int digi_transmit_idle(struct usb_serial_port *port,
 830         unsigned long timeout)
 831 {
 832         int ret;
 833         unsigned char buf[2];
 834         struct digi_port *priv = usb_get_serial_port_data(port);
 835         unsigned long flags = 0;
 836
 837         spin_lock_irqsave(&priv->dp_port_lock, flags);
 838         priv->dp_transmit_idle = 0;
 839         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 840
 841         buf[0] = DIGI_CMD_TRANSMIT_IDLE;
 842         buf[1] = 0;
 843
 844         timeout += jiffies;
 845
 846         if ((ret = digi_write_inb_command(port, buf, 2, timeout - jiffies)) != 0)
 847                 return ret;
 848
 849         spin_lock_irqsave(&priv->dp_port_lock, flags);
 850
 851         while(time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
 852                 cond_wait_interruptible_timeout_irqrestore(
 853                         &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
 854                         &priv->dp_port_lock, flags);
 855                 if (signal_pending(current))
 856                         return -EINTR;
 857                 spin_lock_irqsave(&priv->dp_port_lock, flags);
 858         }
 859         priv->dp_transmit_idle = 0;
 860         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 861         return 0;
 862
 863 }
 864
 865
 866 static void digi_rx_throttle(struct usb_serial_port *port)
 867 {
 868         unsigned long flags;
 869         struct digi_port *priv = usb_get_serial_port_data(port);
 870
 871
 872         dbg("digi_rx_throttle: TOP: port=%d", priv->dp_port_num);
 873
 874         /* stop receiving characters by not resubmitting the read urb */
 875         spin_lock_irqsave(&priv->dp_port_lock, flags);
 876         priv->dp_throttled = 1;
 877         priv->dp_throttle_restart = 0;
 878         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 879 }
 880
 881
 882 static void digi_rx_unthrottle(struct usb_serial_port *port)
 883 {
 884         int ret = 0;
 885         unsigned long flags;
 886         struct digi_port *priv = usb_get_serial_port_data(port);
 887
 888         dbg("digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num);
 889
 890         spin_lock_irqsave(&priv->dp_port_lock, flags);
 891
 892         /* turn throttle off */
 893         priv->dp_throttled = 0;
 894         priv->dp_throttle_restart = 0;
 895
 896         /* restart read chain */
 897         if (priv->dp_throttle_restart) {
 898                 port->read_urb->dev = port->serial->dev;
 899                 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 900         }
 901
 902         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 903
 904         if (ret)
 905                 err("%s: usb_submit_urb failed, ret=%d, port=%d",
 906                         __FUNCTION__, ret, priv->dp_port_num);
 907 }
 908
 909
 910 static void digi_set_termios(struct usb_serial_port *port,
 911                                         struct ktermios *old_termios)
 912 {
 913
 914         struct digi_port *priv = usb_get_serial_port_data(port);
 915         struct tty_struct *tty = port->tty;
 916         unsigned int iflag = tty->termios->c_iflag;
 917         unsigned int cflag = tty->termios->c_cflag;
 918         unsigned int old_iflag = old_termios->c_iflag;
 919         unsigned int old_cflag = old_termios->c_cflag;
 920         unsigned char buf[32];
 921         unsigned int modem_signals;
 922         int arg,ret;
 923         int i = 0;
 924         speed_t baud;
 925
 926         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);
 927
 928         /* set baud rate */
 929         if ((baud = tty_get_baud_rate(tty)) != tty_termios_baud_rate(old_termios)) {
 930                 arg = -1;
 931
 932                 /* reassert DTR and (maybe) RTS on transition from B0 */
 933                 if ((old_cflag&CBAUD) == B0) {
 934                         /* don't set RTS if using hardware flow control */
 935                         /* and throttling input */
 936                         modem_signals = TIOCM_DTR;
 937                         if (!(tty->termios->c_cflag & CRTSCTS) ||
 938                             !test_bit(TTY_THROTTLED, &tty->flags))
 939                                 modem_signals |= TIOCM_RTS;
 940                         digi_set_modem_signals(port, modem_signals, 1);
 941                 }
 942                 switch (baud) {
 943                         /* drop DTR and RTS on transition to B0 */
 944                         case 0: digi_set_modem_signals(port, 0, 1); break;
 945                         case 50: arg = DIGI_BAUD_50; break;
 946                         case 75: arg = DIGI_BAUD_75; break;
 947                         case 110: arg = DIGI_BAUD_110; break;
 948                         case 150: arg = DIGI_BAUD_150; break;
 949                         case 200: arg = DIGI_BAUD_200; break;
 950                         case 300: arg = DIGI_BAUD_300; break;
 951                         case 600: arg = DIGI_BAUD_600; break;
 952                         case 1200: arg = DIGI_BAUD_1200; break;
 953                         case 1800: arg = DIGI_BAUD_1800; break;
 954                         case 2400: arg = DIGI_BAUD_2400; break;
 955                         case 4800: arg = DIGI_BAUD_4800; break;
 956                         case 9600: arg = DIGI_BAUD_9600; break;
 957                         case 19200: arg = DIGI_BAUD_19200; break;
 958                         case 38400: arg = DIGI_BAUD_38400; break;
 959                         case 57600: arg = DIGI_BAUD_57600; break;
 960                         case 115200: arg = DIGI_BAUD_115200; break;
 961                         case 230400: arg = DIGI_BAUD_230400; break;
 962                         case 460800: arg = DIGI_BAUD_460800; break;
 963                         default:
 964                                 arg = DIGI_BAUD_9600;
 965                                 baud = 9600;
 966                                 break;
 967                 }
 968                 if (arg != -1) {
 969                         buf[i++] = DIGI_CMD_SET_BAUD_RATE;
 970                         buf[i++] = priv->dp_port_num;
 971                         buf[i++] = arg;
 972                         buf[i++] = 0;
 973                 }
 974         }
 975         /* set parity */
 976         if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
 977                 if (cflag&PARENB) {
 978                         if (cflag&PARODD)
 979                                 arg = DIGI_PARITY_ODD;
 980                         else
 981                                 arg = DIGI_PARITY_EVEN;
 982                 } else {
 983                         arg = DIGI_PARITY_NONE;
 984                 }
 985                 buf[i++] = DIGI_CMD_SET_PARITY;
 986                 buf[i++] = priv->dp_port_num;
 987                 buf[i++] = arg;
 988                 buf[i++] = 0;
 989         }
 990         /* set word size */
 991         if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
 992                 arg = -1;
 993                 switch (cflag&CSIZE) {
 994                 case CS5: arg = DIGI_WORD_SIZE_5; break;
 995                 case CS6: arg = DIGI_WORD_SIZE_6; break;
 996                 case CS7: arg = DIGI_WORD_SIZE_7; break;
 997                 case CS8: arg = DIGI_WORD_SIZE_8; break;
 998                 default:
 999                         dbg("digi_set_termios: can't handle word size %d",
1000                                 (cflag&CSIZE));
1001                         break;
1002                 }
1003
1004                 if (arg != -1) {
1005                         buf[i++] = DIGI_CMD_SET_WORD_SIZE;
1006                         buf[i++] = priv->dp_port_num;
1007                         buf[i++] = arg;
1008                         buf[i++] = 0;
1009                 }
1010
1011         }
1012
1013         /* set stop bits */
1014         if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
1015
1016                 if ((cflag&CSTOPB))
1017                         arg = DIGI_STOP_BITS_2;
1018                 else
1019                         arg = DIGI_STOP_BITS_1;
1020
1021                 buf[i++] = DIGI_CMD_SET_STOP_BITS;
1022                 buf[i++] = priv->dp_port_num;
1023                 buf[i++] = arg;
1024                 buf[i++] = 0;
1025
1026         }
1027
1028         /* set input flow control */
1029         if ((iflag&IXOFF) != (old_iflag&IXOFF)
1030             || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
1031                 arg = 0;
1032                 if (iflag&IXOFF)
1033                         arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1034                 else
1035                         arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1036
1037                 if (cflag&CRTSCTS) {
1038                         arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
1039
1040                         /* On USB-4 it is necessary to assert RTS prior */
1041                         /* to selecting RTS input flow control.  */
1042                         buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
1043                         buf[i++] = priv->dp_port_num;
1044                         buf[i++] = DIGI_RTS_ACTIVE;
1045                         buf[i++] = 0;
1046
1047                 } else {
1048                         arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
1049                 }
1050                 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1051                 buf[i++] = priv->dp_port_num;
1052                 buf[i++] = arg;
1053                 buf[i++] = 0;
1054         }
1055
1056         /* set output flow control */
1057         if ((iflag&IXON) != (old_iflag&IXON)
1058             || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
1059                 arg = 0;
1060                 if (iflag&IXON)
1061                         arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1062                 else
1063                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1064
1065                 if (cflag&CRTSCTS) {
1066                         arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
1067                 } else {
1068                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
1069                         tty->hw_stopped = 0;
1070                 }
1071
1072                 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1073                 buf[i++] = priv->dp_port_num;
1074                 buf[i++] = arg;
1075                 buf[i++] = 0;
1076         }
1077
1078         /* set receive enable/disable */
1079         if ((cflag&CREAD) != (old_cflag&CREAD)) {
1080                 if (cflag&CREAD)
1081                         arg = DIGI_ENABLE;
1082                 else
1083                         arg = DIGI_DISABLE;
1084
1085                 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
1086                 buf[i++] = priv->dp_port_num;
1087                 buf[i++] = arg;
1088                 buf[i++] = 0;
1089         }
1090         if ((ret = digi_write_oob_command(port, buf, i, 1)) != 0)
1091                 dbg("digi_set_termios: write oob failed, ret=%d", ret);
1092
1093 }
1094
1095
1096 static void digi_break_ctl(struct usb_serial_port *port, int break_state)
1097 {
1098         unsigned char buf[4];
1099
1100         buf[0] = DIGI_CMD_BREAK_CONTROL;
1101         buf[1] = 2;                             /* length */
1102         buf[2] = break_state ? 1 : 0;
1103         buf[3] = 0;                             /* pad */
1104         digi_write_inb_command(port, buf, 4, 0);
1105 }
1106
1107
1108 static int digi_tiocmget(struct usb_serial_port *port, struct file *file)
1109 {
1110         struct digi_port *priv = usb_get_serial_port_data(port);
1111         unsigned int val;
1112         unsigned long flags;
1113
1114         dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num);
1115
1116         spin_lock_irqsave(&priv->dp_port_lock, flags);
1117         val = priv->dp_modem_signals;
1118         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1119         return val;
1120 }
1121
1122
1123 static int digi_tiocmset(struct usb_serial_port *port, struct file *file,
1124         unsigned int set, unsigned int clear)
1125 {
1126         struct digi_port *priv = usb_get_serial_port_data(port);
1127         unsigned int val;
1128         unsigned long flags;
1129
1130         dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num);
1131
1132         spin_lock_irqsave(&priv->dp_port_lock, flags);
1133         val = (priv->dp_modem_signals & ~clear) | set;
1134         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1135         return digi_set_modem_signals(port, val, 1);
1136 }
1137
1138
1139 static int digi_ioctl(struct usb_serial_port *port, struct file *file,
1140         unsigned int cmd, unsigned long arg)
1141 {
1142         struct digi_port *priv = usb_get_serial_port_data(port);
1143         dbg("digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd);
1144
1145         switch (cmd) {
1146         case TIOCMIWAIT:
1147                 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
1148                 /* TODO */
1149                 return 0;
1150         case TIOCGICOUNT:
1151                 /* return count of modemline transitions */
1152                 /* TODO */
1153                 return 0;
1154         }
1155         return -ENOIOCTLCMD;
1156
1157 }
1158
1159 static int digi_write(struct usb_serial_port *port, const unsigned char *buf, int count)
1160 {
1161
1162         int ret,data_len,new_len;
1163         struct digi_port *priv = usb_get_serial_port_data(port);
1164         unsigned char *data = port->write_urb->transfer_buffer;
1165         unsigned long flags = 0;
1166
1167         dbg("digi_write: TOP: port=%d, count=%d, in_interrupt=%ld",
1168                 priv->dp_port_num, count, in_interrupt());
1169
1170         /* copy user data (which can sleep) before getting spin lock */
1171         count = min(count, port->bulk_out_size-2);
1172         count = min(64, count);
1173
1174         /* be sure only one write proceeds at a time */
1175         /* there are races on the port private buffer */
1176         /* and races to check write_urb->status */
1177         spin_lock_irqsave(&priv->dp_port_lock, flags);
1178
1179         /* wait for urb status clear to submit another urb */
1180         if (port->write_urb->status == -EINPROGRESS || priv->dp_write_urb_in_use) {
1181                 /* buffer data if count is 1 (probably put_char) if possible */
1182                 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
1183                         priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
1184                         new_len = 1;
1185                 } else {
1186                         new_len = 0;
1187                 }
1188                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1189                 return new_len;
1190         }
1191
1192         /* allow space for any buffered data and for new data, up to */
1193         /* transfer buffer size - 2 (for command and length bytes) */
1194         new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
1195         data_len = new_len + priv->dp_out_buf_len;
1196
1197         if (data_len == 0) {
1198                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1199                 return 0;
1200         }
1201
1202         port->write_urb->transfer_buffer_length = data_len+2;
1203         port->write_urb->dev = port->serial->dev;
1204
1205         *data++ = DIGI_CMD_SEND_DATA;
1206         *data++ = data_len;
1207
1208         /* copy in buffered data first */
1209         memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
1210         data += priv->dp_out_buf_len;
1211
1212         /* copy in new data */
1213         memcpy(data, buf, new_len);
1214
1215         if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0) {
1216                 priv->dp_write_urb_in_use = 1;
1217                 ret = new_len;
1218                 priv->dp_out_buf_len = 0;
1219         }
1220
1221         /* return length of new data written, or error */
1222         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1223         if (ret < 0)
1224                 err("%s: usb_submit_urb failed, ret=%d, port=%d",
1225                         __FUNCTION__, ret, priv->dp_port_num);
1226         dbg("digi_write: returning %d", ret);
1227         return ret;
1228
1229 }
1230
1231 static void digi_write_bulk_callback(struct urb *urb)
1232 {
1233
1234         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1235         struct usb_serial *serial;
1236         struct digi_port *priv;
1237         struct digi_serial *serial_priv;
1238         int ret = 0;
1239         int status = urb->status;
1240
1241         dbg("digi_write_bulk_callback: TOP, urb->status=%d", status);
1242
1243         /* port and serial sanity check */
1244         if (port == NULL || (priv=usb_get_serial_port_data(port)) == NULL) {
1245                 err("%s: port or port->private is NULL, status=%d",
1246                     __FUNCTION__, status);
1247                 return;
1248         }
1249         serial = port->serial;
1250         if (serial == NULL || (serial_priv=usb_get_serial_data(serial)) == NULL) {
1251                 err("%s: serial or serial->private is NULL, status=%d",
1252                     __FUNCTION__, status);
1253                 return;
1254         }
1255
1256         /* handle oob callback */
1257         if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1258                 dbg("digi_write_bulk_callback: oob callback");
1259                 spin_lock(&priv->dp_port_lock);
1260                 priv->dp_write_urb_in_use = 0;
1261                 wake_up_interruptible(&port->write_wait);
1262                 spin_unlock(&priv->dp_port_lock);
1263                 return;
1264         }
1265
1266         /* try to send any buffered data on this port, if it is open */
1267         spin_lock(&priv->dp_port_lock);
1268         priv->dp_write_urb_in_use = 0;
1269         if (port->open_count && port->write_urb->status != -EINPROGRESS
1270             && priv->dp_out_buf_len > 0) {
1271                 *((unsigned char *)(port->write_urb->transfer_buffer))
1272                         = (unsigned char)DIGI_CMD_SEND_DATA;
1273                 *((unsigned char *)(port->write_urb->transfer_buffer)+1)
1274                         = (unsigned char)priv->dp_out_buf_len;
1275                 port->write_urb->transfer_buffer_length = priv->dp_out_buf_len+2;
1276                 port->write_urb->dev = serial->dev;
1277                 memcpy(port->write_urb->transfer_buffer+2, priv->dp_out_buf,
1278                         priv->dp_out_buf_len);
1279                 if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0) {
1280                         priv->dp_write_urb_in_use = 1;
1281                         priv->dp_out_buf_len = 0;
1282                 }
1283         }
1284         /* wake up processes sleeping on writes immediately */
1285         digi_wakeup_write(port);
1286         /* also queue up a wakeup at scheduler time, in case we */
1287         /* lost the race in write_chan(). */
1288         schedule_work(&priv->dp_wakeup_work);
1289
1290         spin_unlock(&priv->dp_port_lock);
1291         if (ret)
1292                 err("%s: usb_submit_urb failed, ret=%d, port=%d",
1293                         __FUNCTION__, ret, priv->dp_port_num);
1294 }
1295
1296 static int digi_write_room(struct usb_serial_port *port)
1297 {
1298
1299         int room;
1300         struct digi_port *priv = usb_get_serial_port_data(port);
1301         unsigned long flags = 0;
1302
1303         spin_lock_irqsave(&priv->dp_port_lock, flags);
1304
1305         if (port->write_urb->status == -EINPROGRESS || priv->dp_write_urb_in_use)
1306                 room = 0;
1307         else
1308                 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1309
1310         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1311         dbg("digi_write_room: port=%d, room=%d", priv->dp_port_num, room);
1312         return room;
1313
1314 }
1315
1316 static int digi_chars_in_buffer(struct usb_serial_port *port)
1317 {
1318
1319         struct digi_port *priv = usb_get_serial_port_data(port);
1320
1321
1322         if (port->write_urb->status == -EINPROGRESS
1323             || priv->dp_write_urb_in_use) {
1324                 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1325                         priv->dp_port_num, port->bulk_out_size - 2);
1326                 /* return(port->bulk_out_size - 2); */
1327                 return 256;
1328         } else {
1329                 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1330                         priv->dp_port_num, priv->dp_out_buf_len);
1331                 return priv->dp_out_buf_len;
1332         }
1333
1334 }
1335
1336
1337 static int digi_open(struct usb_serial_port *port, struct file *filp)
1338 {
1339         int ret;
1340         unsigned char buf[32];
1341         struct digi_port *priv = usb_get_serial_port_data(port);
1342         struct ktermios not_termios;
1343         unsigned long flags = 0;
1344
1345         dbg("digi_open: TOP: port=%d, open_count=%d",
1346                 priv->dp_port_num, port->open_count);
1347
1348         /* be sure the device is started up */
1349         if (digi_startup_device(port->serial) != 0)
1350                 return -ENXIO;
1351
1352         spin_lock_irqsave(&priv->dp_port_lock, flags);
1353
1354         /* don't wait on a close in progress for non-blocking opens */
1355         if (priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) {
1356                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1357                 return -EAGAIN;
1358         }
1359
1360         /* wait for a close in progress to finish */
1361         while(priv->dp_in_close) {
1362                 cond_wait_interruptible_timeout_irqrestore(
1363                         &priv->dp_close_wait, DIGI_RETRY_TIMEOUT,
1364                         &priv->dp_port_lock, flags);
1365                 if (signal_pending(current))
1366                         return -EINTR;
1367                 spin_lock_irqsave(&priv->dp_port_lock, flags);
1368         }
1369
1370         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1371
1372         /* read modem signals automatically whenever they change */
1373         buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1374         buf[1] = priv->dp_port_num;
1375         buf[2] = DIGI_ENABLE;
1376         buf[3] = 0;
1377
1378         /* flush fifos */
1379         buf[4] = DIGI_CMD_IFLUSH_FIFO;
1380         buf[5] = priv->dp_port_num;
1381         buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1382         buf[7] = 0;
1383
1384         if ((ret = digi_write_oob_command(port, buf, 8, 1)) != 0)
1385                 dbg("digi_open: write oob failed, ret=%d", ret);
1386
1387         /* set termios settings */
1388         not_termios.c_cflag = ~port->tty->termios->c_cflag;
1389         not_termios.c_iflag = ~port->tty->termios->c_iflag;
1390         digi_set_termios(port, &not_termios);
1391
1392         /* set DTR and RTS */
1393         digi_set_modem_signals(port, TIOCM_DTR|TIOCM_RTS, 1);
1394
1395         return 0;
1396 }
1397
1398
1399 static void digi_close(struct usb_serial_port *port, struct file *filp)
1400 {
1401         DEFINE_WAIT(wait);
1402         int ret;
1403         unsigned char buf[32];
1404         struct tty_struct *tty = port->tty;
1405         struct digi_port *priv = usb_get_serial_port_data(port);
1406         unsigned long flags = 0;
1407
1408         dbg("digi_close: TOP: port=%d, open_count=%d",
1409                 priv->dp_port_num, port->open_count);
1410
1411         /* if disconnected, just clear flags */
1412         if (!usb_get_intfdata(port->serial->interface))
1413                 goto exit;
1414
1415         /* do cleanup only after final close on this port */
1416         spin_lock_irqsave(&priv->dp_port_lock, flags);
1417         priv->dp_in_close = 1;
1418         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1419
1420         /* tell line discipline to process only XON/XOFF */
1421         tty->closing = 1;
1422
1423         /* wait for output to drain */
1424         if ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0)
1425                 tty_wait_until_sent(tty, DIGI_CLOSE_TIMEOUT);
1426
1427         /* flush driver and line discipline buffers */
1428         if (tty->driver->flush_buffer)
1429                 tty->driver->flush_buffer(tty);
1430         tty_ldisc_flush(tty);
1431
1432         if (port->serial->dev) {
1433                 /* wait for transmit idle */
1434                 if ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) {
1435                         digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1436                 }
1437                 /* drop DTR and RTS */
1438                 digi_set_modem_signals(port, 0, 0);
1439
1440                 /* disable input flow control */
1441                 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1442                 buf[1] = priv->dp_port_num;
1443                 buf[2] = DIGI_DISABLE;
1444                 buf[3] = 0;
1445
1446                 /* disable output flow control */
1447                 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1448                 buf[5] = priv->dp_port_num;
1449                 buf[6] = DIGI_DISABLE;
1450                 buf[7] = 0;
1451
1452                 /* disable reading modem signals automatically */
1453                 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1454                 buf[9] = priv->dp_port_num;
1455                 buf[10] = DIGI_DISABLE;
1456                 buf[11] = 0;
1457
1458                 /* disable receive */
1459                 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1460                 buf[13] = priv->dp_port_num;
1461                 buf[14] = DIGI_DISABLE;
1462                 buf[15] = 0;
1463
1464                 /* flush fifos */
1465                 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1466                 buf[17] = priv->dp_port_num;
1467                 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1468                 buf[19] = 0;
1469
1470                 if ((ret = digi_write_oob_command(port, buf, 20, 0)) != 0)
1471                         dbg("digi_close: write oob failed, ret=%d", ret);
1472
1473                 /* wait for final commands on oob port to complete */
1474                 prepare_to_wait(&priv->dp_flush_wait, &wait, TASK_INTERRUPTIBLE);
1475                 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1476                 finish_wait(&priv->dp_flush_wait, &wait);
1477
1478                 /* shutdown any outstanding bulk writes */
1479                 usb_kill_urb(port->write_urb);
1480         }
1481         tty->closing = 0;
1482 exit:
1483         spin_lock_irqsave(&priv->dp_port_lock, flags);
1484         priv->dp_write_urb_in_use = 0;
1485         priv->dp_in_close = 0;
1486         wake_up_interruptible(&priv->dp_close_wait);
1487         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1488         dbg("digi_close: done");
1489 }
1490
1491
1492 /*
1493 *  Digi Startup Device
1494 *
1495 *  Starts reads on all ports.  Must be called AFTER startup, with
1496 *  urbs initialized.  Returns 0 if successful, non-zero error otherwise.
1497 */
1498
1499 static int digi_startup_device(struct usb_serial *serial)
1500 {
1501         int i,ret = 0;
1502         struct digi_serial *serial_priv = usb_get_serial_data(serial);
1503         struct usb_serial_port *port;
1504
1505         /* be sure this happens exactly once */
1506         spin_lock(&serial_priv->ds_serial_lock);
1507         if (serial_priv->ds_device_started) {
1508                 spin_unlock(&serial_priv->ds_serial_lock);
1509                 return 0;
1510         }
1511         serial_priv->ds_device_started = 1;
1512         spin_unlock(&serial_priv->ds_serial_lock);
1513
1514         /* start reading from each bulk in endpoint for the device */
1515         /* set USB_DISABLE_SPD flag for write bulk urbs */
1516         for (i = 0; i < serial->type->num_ports + 1; i++) {
1517                 port = serial->port[i];
1518                 port->write_urb->dev = port->serial->dev;
1519                 if ((ret = usb_submit_urb(port->read_urb, GFP_KERNEL)) != 0) {
1520                         err("%s: usb_submit_urb failed, ret=%d, port=%d",
1521                                         __FUNCTION__, ret, i);
1522                         break;
1523                 }
1524         }
1525         return ret;
1526 }
1527
1528
1529 static int digi_startup(struct usb_serial *serial)
1530 {
1531
1532         int i;
1533         struct digi_port *priv;
1534         struct digi_serial *serial_priv;
1535
1536         dbg("digi_startup: TOP");
1537
1538         /* allocate the private data structures for all ports */
1539         /* number of regular ports + 1 for the out-of-band port */
1540         for(i = 0; i < serial->type->num_ports + 1; i++) {
1541                 /* allocate port private structure */
1542                 priv = kmalloc(sizeof(struct digi_port), GFP_KERNEL);
1543                 if (priv == NULL) {
1544                         while (--i >= 0)
1545                                 kfree(usb_get_serial_port_data(serial->port[i]));
1546                         return 1;                       /* error */
1547                 }
1548
1549                 /* initialize port private structure */
1550                 spin_lock_init(&priv->dp_port_lock);
1551                 priv->dp_port_num = i;
1552                 priv->dp_out_buf_len = 0;
1553                 priv->dp_write_urb_in_use = 0;
1554                 priv->dp_modem_signals = 0;
1555                 init_waitqueue_head(&priv->dp_modem_change_wait);
1556                 priv->dp_transmit_idle = 0;
1557                 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1558                 priv->dp_throttled = 0;
1559                 priv->dp_throttle_restart = 0;
1560                 init_waitqueue_head(&priv->dp_flush_wait);
1561                 priv->dp_in_close = 0;
1562                 init_waitqueue_head(&priv->dp_close_wait);
1563                 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1564                 priv->dp_port = serial->port[i];
1565                 /* initialize write wait queue for this port */
1566                 init_waitqueue_head(&serial->port[i]->write_wait);
1567
1568                 usb_set_serial_port_data(serial->port[i], priv);
1569         }
1570
1571         /* allocate serial private structure */
1572         serial_priv = kmalloc(sizeof(struct digi_serial), GFP_KERNEL);
1573         if (serial_priv == NULL) {
1574                 for (i = 0; i < serial->type->num_ports + 1; i++)
1575                         kfree(usb_get_serial_port_data(serial->port[i]));
1576                 return 1;                       /* error */
1577         }
1578
1579         /* initialize serial private structure */
1580         spin_lock_init(&serial_priv->ds_serial_lock);
1581         serial_priv->ds_oob_port_num = serial->type->num_ports;
1582         serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1583         serial_priv->ds_device_started = 0;
1584         usb_set_serial_data(serial, serial_priv);
1585
1586         return 0;
1587 }
1588
1589
1590 static void digi_shutdown(struct usb_serial *serial)
1591 {
1592         int i;
1593         dbg("digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt());
1594
1595         /* stop reads and writes on all ports */
1596         for (i = 0; i < serial->type->num_ports + 1; i++) {
1597                 usb_kill_urb(serial->port[i]->read_urb);
1598                 usb_kill_urb(serial->port[i]->write_urb);
1599         }
1600
1601         /* free the private data structures for all ports */
1602         /* number of regular ports + 1 for the out-of-band port */
1603         for(i = 0; i < serial->type->num_ports + 1; i++)
1604                 kfree(usb_get_serial_port_data(serial->port[i]));
1605         kfree(usb_get_serial_data(serial));
1606 }
1607
1608
1609 static void digi_read_bulk_callback(struct urb *urb)
1610 {
1611         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1612         struct digi_port *priv;
1613         struct digi_serial *serial_priv;
1614         int ret;
1615         int status = urb->status;
1616
1617         dbg("digi_read_bulk_callback: TOP");
1618
1619         /* port sanity check, do not resubmit if port is not valid */
1620         if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
1621                 err("%s: port or port->private is NULL, status=%d",
1622                     __FUNCTION__, status);
1623                 return;
1624         }
1625         if (port->serial == NULL ||
1626                 (serial_priv=usb_get_serial_data(port->serial)) == NULL) {
1627                 err("%s: serial is bad or serial->private is NULL, status=%d",
1628                         __FUNCTION__, status);
1629                 return;
1630         }
1631
1632         /* do not resubmit urb if it has any status error */
1633         if (status) {
1634                 err("%s: nonzero read bulk status: status=%d, port=%d",
1635                     __FUNCTION__, status, priv->dp_port_num);
1636                 return;
1637         }
1638
1639         /* handle oob or inb callback, do not resubmit if error */
1640         if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1641                 if (digi_read_oob_callback(urb) != 0)
1642                         return;
1643         } else {
1644                 if (digi_read_inb_callback(urb) != 0)
1645                         return;
1646         }
1647
1648         /* continue read */
1649         urb->dev = port->serial->dev;
1650         if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) != 0) {
1651                 err("%s: failed resubmitting urb, ret=%d, port=%d",
1652                     __FUNCTION__, ret, priv->dp_port_num);
1653         }
1654
1655 }
1656
1657 /*
1658 *  Digi Read INB Callback
1659 *
1660 *  Digi Read INB Callback handles reads on the in band ports, sending
1661 *  the data on to the tty subsystem.  When called we know port and
1662 *  port->private are not NULL and port->serial has been validated.
1663 *  It returns 0 if successful, 1 if successful but the port is
1664 *  throttled, and -1 if the sanity checks failed.
1665 */
1666
1667 static int digi_read_inb_callback(struct urb *urb)
1668 {
1669
1670         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1671         struct tty_struct *tty = port->tty;
1672         struct digi_port *priv = usb_get_serial_port_data(port);
1673         int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1674         int len = ((unsigned char *)urb->transfer_buffer)[1];
1675         int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1676         unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3;
1677         int flag,throttled;
1678         int i;
1679         int status = urb->status;
1680
1681         /* do not process callbacks on closed ports */
1682         /* but do continue the read chain */
1683         if (port->open_count == 0)
1684                 return 0;
1685
1686         /* short/multiple packet check */
1687         if (urb->actual_length != len + 2) {
1688                 err("%s: INCOMPLETE OR MULTIPLE PACKET, urb->status=%d, "
1689                     "port=%d, opcode=%d, len=%d, actual_length=%d, "
1690                     "status=%d", __FUNCTION__, status, priv->dp_port_num,
1691                     opcode, len, urb->actual_length, port_status);
1692                 return -1;
1693         }
1694
1695         spin_lock(&priv->dp_port_lock);
1696
1697         /* check for throttle; if set, do not resubmit read urb */
1698         /* indicate the read chain needs to be restarted on unthrottle */
1699         throttled = priv->dp_throttled;
1700         if (throttled)
1701                 priv->dp_throttle_restart = 1;
1702
1703         /* receive data */
1704         if (opcode == DIGI_CMD_RECEIVE_DATA) {
1705                 /* get flag from port_status */
1706                 flag = 0;
1707
1708                 /* overrun is special, not associated with a char */
1709                 if (port_status & DIGI_OVERRUN_ERROR)
1710                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1711
1712                 /* break takes precedence over parity, */
1713                 /* which takes precedence over framing errors */
1714                 if (port_status & DIGI_BREAK_ERROR)
1715                         flag = TTY_BREAK;
1716                 else if (port_status & DIGI_PARITY_ERROR)
1717                         flag = TTY_PARITY;
1718                 else if (port_status & DIGI_FRAMING_ERROR)
1719                         flag = TTY_FRAME;
1720
1721                 /* data length is len-1 (one byte of len is port_status) */
1722                 --len;
1723
1724                 len = tty_buffer_request_room(tty, len);
1725                 if (len > 0) {
1726                         /* Hot path */
1727                         if (flag == TTY_NORMAL)
1728                                 tty_insert_flip_string(tty, data, len);
1729                         else {
1730                                 for(i = 0; i < len; i++)
1731                                         tty_insert_flip_char(tty, data[i], flag);
1732                         }
1733                         tty_flip_buffer_push(tty);
1734                 }
1735         }
1736         spin_unlock(&priv->dp_port_lock);
1737
1738         if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1739                 dbg("%s: got RECEIVE_DISABLE", __FUNCTION__);
1740         else if (opcode != DIGI_CMD_RECEIVE_DATA)
1741                 dbg("%s: unknown opcode: %d", __FUNCTION__, opcode);
1742
1743         return(throttled ? 1 : 0);
1744
1745 }
1746
1747
1748 /*
1749 *  Digi Read OOB Callback
1750 *
1751 *  Digi Read OOB Callback handles reads on the out of band port.
1752 *  When called we know port and port->private are not NULL and
1753 *  the port->serial is valid.  It returns 0 if successful, and
1754 *  -1 if the sanity checks failed.
1755 */
1756
1757 static int digi_read_oob_callback(struct urb *urb)
1758 {
1759
1760         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1761         struct usb_serial *serial = port->serial;
1762         struct digi_port *priv = usb_get_serial_port_data(port);
1763         int opcode, line, status, val;
1764         int i;
1765
1766         dbg("digi_read_oob_callback: port=%d, len=%d",
1767                         priv->dp_port_num, urb->actual_length);
1768
1769         /* handle each oob command */
1770         for(i = 0; i < urb->actual_length - 3;) {
1771                 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1772                 line = ((unsigned char *)urb->transfer_buffer)[i++];
1773                 status = ((unsigned char *)urb->transfer_buffer)[i++];
1774                 val = ((unsigned char *)urb->transfer_buffer)[i++];
1775
1776                 dbg("digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1777                         opcode, line, status, val);
1778
1779                 if (status != 0 || line >= serial->type->num_ports)
1780                         continue;
1781
1782                 port = serial->port[line];
1783
1784                 if ((priv=usb_get_serial_port_data(port)) == NULL)
1785                         return -1;
1786
1787                 if (opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1788                         spin_lock(&priv->dp_port_lock);
1789                         /* convert from digi flags to termiox flags */
1790                         if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1791                                 priv->dp_modem_signals |= TIOCM_CTS;
1792                                 /* port must be open to use tty struct */
1793                                 if (port->open_count
1794                                         && port->tty->termios->c_cflag & CRTSCTS) {
1795                                         port->tty->hw_stopped = 0;
1796                                         digi_wakeup_write(port);
1797                                 }
1798                         } else {
1799                                 priv->dp_modem_signals &= ~TIOCM_CTS;
1800                                 /* port must be open to use tty struct */
1801                                 if (port->open_count
1802                                         && port->tty->termios->c_cflag & CRTSCTS) {
1803                                         port->tty->hw_stopped = 1;
1804                                 }
1805                         }
1806                         if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1807                                 priv->dp_modem_signals |= TIOCM_DSR;
1808                         else
1809                                 priv->dp_modem_signals &= ~TIOCM_DSR;
1810                         if (val & DIGI_READ_INPUT_SIGNALS_RI)
1811                                 priv->dp_modem_signals |= TIOCM_RI;
1812                         else
1813                                 priv->dp_modem_signals &= ~TIOCM_RI;
1814                         if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1815                                 priv->dp_modem_signals |= TIOCM_CD;
1816                         else
1817                                 priv->dp_modem_signals &= ~TIOCM_CD;
1818
1819                         wake_up_interruptible(&priv->dp_modem_change_wait);
1820                         spin_unlock(&priv->dp_port_lock);
1821                 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1822                         spin_lock(&priv->dp_port_lock);
1823                         priv->dp_transmit_idle = 1;
1824                         wake_up_interruptible(&priv->dp_transmit_idle_wait);
1825                         spin_unlock(&priv->dp_port_lock);
1826                 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1827                         wake_up_interruptible(&priv->dp_flush_wait);
1828                 }
1829         }
1830         return 0;
1831
1832 }
1833
1834 static int __init digi_init(void)
1835 {
1836         int retval;
1837         retval = usb_serial_register(&digi_acceleport_2_device);
1838         if (retval)
1839                 goto failed_acceleport_2_device;
1840         retval = usb_serial_register(&digi_acceleport_4_device);
1841         if (retval)
1842                 goto failed_acceleport_4_device;
1843         retval = usb_register(&digi_driver);
1844         if (retval)
1845                 goto failed_usb_register;
1846         info(DRIVER_VERSION ":" DRIVER_DESC);
1847         return 0;
1848 failed_usb_register:
1849         usb_serial_deregister(&digi_acceleport_4_device);
1850 failed_acceleport_4_device:
1851         usb_serial_deregister(&digi_acceleport_2_device);
1852 failed_acceleport_2_device:
1853         return retval;
1854 }
1855
1856 static void __exit digi_exit (void)
1857 {
1858         usb_deregister(&digi_driver);
1859         usb_serial_deregister(&digi_acceleport_2_device);
1860         usb_serial_deregister(&digi_acceleport_4_device);
1861 }
1862
1863
1864 module_init(digi_init);
1865 module_exit(digi_exit);
1866
1867
1868 MODULE_AUTHOR(DRIVER_AUTHOR);
1869 MODULE_DESCRIPTION(DRIVER_DESC);
1870 MODULE_LICENSE("GPL");
1871
1872 module_param(debug, bool, S_IRUGO | S_IWUSR);
1873 MODULE_PARM_DESC(debug, "Debug enabled or not");