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_ports =                    3,
 512         .open =                         digi_open,
 513         .close =                        digi_close,
 514         .write =                        digi_write,
 515         .write_room =                   digi_write_room,
 516         .write_bulk_callback =          digi_write_bulk_callback,
 517         .read_bulk_callback =           digi_read_bulk_callback,
 518         .chars_in_buffer =              digi_chars_in_buffer,
 519         .throttle =                     digi_rx_throttle,
 520         .unthrottle =                   digi_rx_unthrottle,
 521         .ioctl =                        digi_ioctl,
 522         .set_termios =                  digi_set_termios,
 523         .break_ctl =                    digi_break_ctl,
 524         .tiocmget =                     digi_tiocmget,
 525         .tiocmset =                     digi_tiocmset,
 526         .attach =                       digi_startup,
 527         .shutdown =                     digi_shutdown,
 528 };
 529
 530 static struct usb_serial_driver digi_acceleport_4_device = {
 531         .driver = {
 532                 .owner =                THIS_MODULE,
 533                 .name =                 "digi_4",
 534         },
 535         .description =                  "Digi 4 port USB adapter",
 536         .usb_driver =                   &digi_driver,
 537         .id_table =                     id_table_4,
 538         .num_ports =                    4,
 539         .open =                         digi_open,
 540         .close =                        digi_close,
 541         .write =                        digi_write,
 542         .write_room =                   digi_write_room,
 543         .write_bulk_callback =          digi_write_bulk_callback,
 544         .read_bulk_callback =           digi_read_bulk_callback,
 545         .chars_in_buffer =              digi_chars_in_buffer,
 546         .throttle =                     digi_rx_throttle,
 547         .unthrottle =                   digi_rx_unthrottle,
 548         .ioctl =                        digi_ioctl,
 549         .set_termios =                  digi_set_termios,
 550         .break_ctl =                    digi_break_ctl,
 551         .tiocmget =                     digi_tiocmget,
 552         .tiocmset =                     digi_tiocmset,
 553         .attach =                       digi_startup,
 554         .shutdown =                     digi_shutdown,
 555 };
 556
 557
 558 /* Functions */
 559
 560 /*
 561 *  Cond Wait Interruptible Timeout Irqrestore
 562 *
 563 *  Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
 564 *  so that wake ups are not lost if they occur between the unlock
 565 *  and the sleep.  In other words, spin_unlock_irqrestore and
 566 *  interruptible_sleep_on_timeout are "atomic" with respect to
 567 *  wake ups.  This is used to implement condition variables.
 568 *
 569 *  interruptible_sleep_on_timeout is deprecated and has been replaced
 570 *  with the equivalent code.
 571 */
 572
 573 static long cond_wait_interruptible_timeout_irqrestore(
 574         wait_queue_head_t *q, long timeout,
 575         spinlock_t *lock, unsigned long flags)
 576 {
 577         DEFINE_WAIT(wait);
 578
 579         prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
 580         spin_unlock_irqrestore(lock, flags);
 581         timeout = schedule_timeout(timeout);
 582         finish_wait(q, &wait);
 583
 584         return timeout;
 585 }
 586
 587
 588 /*
 589 *  Digi Wakeup Write
 590 *
 591 *  Wake up port, line discipline, and tty processes sleeping
 592 *  on writes.
 593 */
 594
 595 static void digi_wakeup_write_lock(struct work_struct *work)
 596 {
 597         struct digi_port *priv = container_of(work, struct digi_port, dp_wakeup_work);
 598         struct usb_serial_port *port = priv->dp_port;
 599         unsigned long flags;
 600
 601         spin_lock_irqsave(&priv->dp_port_lock, flags);
 602         digi_wakeup_write(port);
 603         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 604 }
 605
 606 static void digi_wakeup_write(struct usb_serial_port *port)
 607 {
 608         tty_wakeup(port->tty);
 609 }
 610
 611
 612 /*
 613 *  Digi Write OOB Command
 614 *
 615 *  Write commands on the out of band port.  Commands are 4
 616 *  bytes each, multiple commands can be sent at once, and
 617 *  no command will be split across USB packets.  Returns 0
 618 *  if successful, -EINTR if interrupted while sleeping and
 619 *  the interruptible flag is true, or a negative error
 620 *  returned by usb_submit_urb.
 621 */
 622
 623 static int digi_write_oob_command(struct usb_serial_port *port,
 624         unsigned char *buf, int count, int interruptible)
 625 {
 626
 627         int ret = 0;
 628         int len;
 629         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 630         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 631         unsigned long flags = 0;
 632
 633         dbg("digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count);
 634
 635         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 636         while(count > 0) {
 637                 while(oob_port->write_urb->status == -EINPROGRESS
 638                         || oob_priv->dp_write_urb_in_use) {
 639                         cond_wait_interruptible_timeout_irqrestore(
 640                                 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
 641                                 &oob_priv->dp_port_lock, flags);
 642                         if (interruptible && signal_pending(current))
 643                                 return -EINTR;
 644                         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 645                 }
 646
 647                 /* len must be a multiple of 4, so commands are not split */
 648                 len = min(count, oob_port->bulk_out_size);
 649                 if (len > 4)
 650                         len &= ~3;
 651                 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
 652                 oob_port->write_urb->transfer_buffer_length = len;
 653                 oob_port->write_urb->dev = port->serial->dev;
 654                 if ((ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0) {
 655                         oob_priv->dp_write_urb_in_use = 1;
 656                         count -= len;
 657                         buf += len;
 658                 }
 659         }
 660         spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
 661         if (ret)
 662                 err("%s: usb_submit_urb failed, ret=%d", __func__, ret);
 663         return ret;
 664
 665 }
 666
 667
 668 /*
 669 *  Digi Write In Band Command
 670 *
 671 *  Write commands on the given port.  Commands are 4
 672 *  bytes each, multiple commands can be sent at once, and
 673 *  no command will be split across USB packets.  If timeout
 674 *  is non-zero, write in band command will return after
 675 *  waiting unsuccessfully for the URB status to clear for
 676 *  timeout ticks.  Returns 0 if successful, or a negative
 677 *  error returned by digi_write.
 678 */
 679
 680 static int digi_write_inb_command(struct usb_serial_port *port,
 681         unsigned char *buf, int count, unsigned long timeout)
 682 {
 683         int ret = 0;
 684         int len;
 685         struct digi_port *priv = usb_get_serial_port_data(port);
 686         unsigned char *data = port->write_urb->transfer_buffer;
 687         unsigned long flags = 0;
 688
 689         dbg("digi_write_inb_command: TOP: port=%d, count=%d",
 690                 priv->dp_port_num, count);
 691
 692         if (timeout)
 693                 timeout += jiffies;
 694         else
 695                 timeout = ULONG_MAX;
 696
 697         spin_lock_irqsave(&priv->dp_port_lock, flags);
 698         while(count > 0 && ret == 0) {
 699                 while((port->write_urb->status == -EINPROGRESS
 700                         || priv->dp_write_urb_in_use) && time_before(jiffies, timeout)) {
 701                         cond_wait_interruptible_timeout_irqrestore(
 702                                 &port->write_wait, DIGI_RETRY_TIMEOUT,
 703                                 &priv->dp_port_lock, flags);
 704                         if (signal_pending(current))
 705                                 return -EINTR;
 706                         spin_lock_irqsave(&priv->dp_port_lock, flags);
 707                 }
 708
 709                 /* len must be a multiple of 4 and small enough to */
 710                 /* guarantee the write will send buffered data first, */
 711                 /* so commands are in order with data and not split */
 712                 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
 713                 if (len > 4)
 714                         len &= ~3;
 715
 716                 /* write any buffered data first */
 717                 if (priv->dp_out_buf_len > 0) {
 718                         data[0] = DIGI_CMD_SEND_DATA;
 719                         data[1] = priv->dp_out_buf_len;
 720                         memcpy(data + 2, priv->dp_out_buf,
 721                                 priv->dp_out_buf_len);
 722                         memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
 723                         port->write_urb->transfer_buffer_length
 724                                 = priv->dp_out_buf_len + 2 + len;
 725                 } else {
 726                         memcpy(data, buf, len);
 727                         port->write_urb->transfer_buffer_length = len;
 728                 }
 729                 port->write_urb->dev = port->serial->dev;
 730
 731                 if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0) {
 732                         priv->dp_write_urb_in_use = 1;
 733                         priv->dp_out_buf_len = 0;
 734                         count -= len;
 735                         buf += len;
 736                 }
 737
 738         }
 739         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 740
 741         if (ret)
 742                 err("%s: usb_submit_urb failed, ret=%d, port=%d",
 743                         __func__, ret, priv->dp_port_num);
 744         return ret;
 745 }
 746
 747
 748 /*
 749 *  Digi Set Modem Signals
 750 *
 751 *  Sets or clears DTR and RTS on the port, according to the
 752 *  modem_signals argument.  Use TIOCM_DTR and TIOCM_RTS flags
 753 *  for the modem_signals argument.  Returns 0 if successful,
 754 *  -EINTR if interrupted while sleeping, or a non-zero error
 755 *  returned by usb_submit_urb.
 756 */
 757
 758 static int digi_set_modem_signals(struct usb_serial_port *port,
 759         unsigned int modem_signals, int interruptible)
 760 {
 761
 762         int ret;
 763         struct digi_port *port_priv = usb_get_serial_port_data(port);
 764         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 765         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 766         unsigned char *data = oob_port->write_urb->transfer_buffer;
 767         unsigned long flags = 0;
 768
 769
 770         dbg("digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
 771                 port_priv->dp_port_num, modem_signals);
 772
 773         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 774         spin_lock(&port_priv->dp_port_lock);
 775
 776         while(oob_port->write_urb->status == -EINPROGRESS || oob_priv->dp_write_urb_in_use) {
 777                 spin_unlock(&port_priv->dp_port_lock);
 778                 cond_wait_interruptible_timeout_irqrestore(
 779                         &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
 780                         &oob_priv->dp_port_lock, flags);
 781                 if (interruptible && signal_pending(current))
 782                         return -EINTR;
 783                 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 784                 spin_lock(&port_priv->dp_port_lock);
 785         }
 786         data[0] = DIGI_CMD_SET_DTR_SIGNAL;
 787         data[1] = port_priv->dp_port_num;
 788         data[2] = (modem_signals&TIOCM_DTR) ? DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
 789         data[3] = 0;
 790         data[4] = DIGI_CMD_SET_RTS_SIGNAL;
 791         data[5] = port_priv->dp_port_num;
 792         data[6] = (modem_signals&TIOCM_RTS) ? DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
 793         data[7] = 0;
 794
 795         oob_port->write_urb->transfer_buffer_length = 8;
 796         oob_port->write_urb->dev = port->serial->dev;
 797
 798         if ((ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0) {
 799                 oob_priv->dp_write_urb_in_use = 1;
 800                 port_priv->dp_modem_signals =
 801                         (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
 802                         | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
 803         }
 804         spin_unlock(&port_priv->dp_port_lock);
 805         spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
 806         if (ret)
 807                 err("%s: usb_submit_urb failed, ret=%d", __func__, ret);
 808         return ret;
 809 }
 810
 811 /*
 812 *  Digi Transmit Idle
 813 *
 814 *  Digi transmit idle waits, up to timeout ticks, for the transmitter
 815 *  to go idle.  It returns 0 if successful or a negative error.
 816 *
 817 *  There are race conditions here if more than one process is calling
 818 *  digi_transmit_idle on the same port at the same time.  However, this
 819 *  is only called from close, and only one process can be in close on a
 820 *  port at a time, so its ok.
 821 */
 822
 823 static int digi_transmit_idle(struct usb_serial_port *port,
 824         unsigned long timeout)
 825 {
 826         int ret;
 827         unsigned char buf[2];
 828         struct digi_port *priv = usb_get_serial_port_data(port);
 829         unsigned long flags = 0;
 830
 831         spin_lock_irqsave(&priv->dp_port_lock, flags);
 832         priv->dp_transmit_idle = 0;
 833         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 834
 835         buf[0] = DIGI_CMD_TRANSMIT_IDLE;
 836         buf[1] = 0;
 837
 838         timeout += jiffies;
 839
 840         if ((ret = digi_write_inb_command(port, buf, 2, timeout - jiffies)) != 0)
 841                 return ret;
 842
 843         spin_lock_irqsave(&priv->dp_port_lock, flags);
 844
 845         while(time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
 846                 cond_wait_interruptible_timeout_irqrestore(
 847                         &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
 848                         &priv->dp_port_lock, flags);
 849                 if (signal_pending(current))
 850                         return -EINTR;
 851                 spin_lock_irqsave(&priv->dp_port_lock, flags);
 852         }
 853         priv->dp_transmit_idle = 0;
 854         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 855         return 0;
 856
 857 }
 858
 859
 860 static void digi_rx_throttle(struct usb_serial_port *port)
 861 {
 862         unsigned long flags;
 863         struct digi_port *priv = usb_get_serial_port_data(port);
 864
 865
 866         dbg("digi_rx_throttle: TOP: port=%d", priv->dp_port_num);
 867
 868         /* stop receiving characters by not resubmitting the read urb */
 869         spin_lock_irqsave(&priv->dp_port_lock, flags);
 870         priv->dp_throttled = 1;
 871         priv->dp_throttle_restart = 0;
 872         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 873 }
 874
 875
 876 static void digi_rx_unthrottle(struct usb_serial_port *port)
 877 {
 878         int ret = 0;
 879         unsigned long flags;
 880         struct digi_port *priv = usb_get_serial_port_data(port);
 881
 882         dbg("digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num);
 883
 884         spin_lock_irqsave(&priv->dp_port_lock, flags);
 885
 886         /* turn throttle off */
 887         priv->dp_throttled = 0;
 888         priv->dp_throttle_restart = 0;
 889
 890         /* restart read chain */
 891         if (priv->dp_throttle_restart) {
 892                 port->read_urb->dev = port->serial->dev;
 893                 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 894         }
 895
 896         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 897
 898         if (ret)
 899                 err("%s: usb_submit_urb failed, ret=%d, port=%d",
 900                         __func__, ret, priv->dp_port_num);
 901 }
 902
 903
 904 static void digi_set_termios(struct usb_serial_port *port,
 905                                         struct ktermios *old_termios)
 906 {
 907
 908         struct digi_port *priv = usb_get_serial_port_data(port);
 909         struct tty_struct *tty = port->tty;
 910         unsigned int iflag = tty->termios->c_iflag;
 911         unsigned int cflag = tty->termios->c_cflag;
 912         unsigned int old_iflag = old_termios->c_iflag;
 913         unsigned int old_cflag = old_termios->c_cflag;
 914         unsigned char buf[32];
 915         unsigned int modem_signals;
 916         int arg,ret;
 917         int i = 0;
 918         speed_t baud;
 919
 920         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);
 921
 922         /* set baud rate */
 923         if ((baud = tty_get_baud_rate(tty)) != tty_termios_baud_rate(old_termios)) {
 924                 arg = -1;
 925
 926                 /* reassert DTR and (maybe) RTS on transition from B0 */
 927                 if ((old_cflag&CBAUD) == B0) {
 928                         /* don't set RTS if using hardware flow control */
 929                         /* and throttling input */
 930                         modem_signals = TIOCM_DTR;
 931                         if (!(tty->termios->c_cflag & CRTSCTS) ||
 932                             !test_bit(TTY_THROTTLED, &tty->flags))
 933                                 modem_signals |= TIOCM_RTS;
 934                         digi_set_modem_signals(port, modem_signals, 1);
 935                 }
 936                 switch (baud) {
 937                         /* drop DTR and RTS on transition to B0 */
 938                         case 0: digi_set_modem_signals(port, 0, 1); break;
 939                         case 50: arg = DIGI_BAUD_50; break;
 940                         case 75: arg = DIGI_BAUD_75; break;
 941                         case 110: arg = DIGI_BAUD_110; break;
 942                         case 150: arg = DIGI_BAUD_150; break;
 943                         case 200: arg = DIGI_BAUD_200; break;
 944                         case 300: arg = DIGI_BAUD_300; break;
 945                         case 600: arg = DIGI_BAUD_600; break;
 946                         case 1200: arg = DIGI_BAUD_1200; break;
 947                         case 1800: arg = DIGI_BAUD_1800; break;
 948                         case 2400: arg = DIGI_BAUD_2400; break;
 949                         case 4800: arg = DIGI_BAUD_4800; break;
 950                         case 9600: arg = DIGI_BAUD_9600; break;
 951                         case 19200: arg = DIGI_BAUD_19200; break;
 952                         case 38400: arg = DIGI_BAUD_38400; break;
 953                         case 57600: arg = DIGI_BAUD_57600; break;
 954                         case 115200: arg = DIGI_BAUD_115200; break;
 955                         case 230400: arg = DIGI_BAUD_230400; break;
 956                         case 460800: arg = DIGI_BAUD_460800; break;
 957                         default:
 958                                 arg = DIGI_BAUD_9600;
 959                                 baud = 9600;
 960                                 break;
 961                 }
 962                 if (arg != -1) {
 963                         buf[i++] = DIGI_CMD_SET_BAUD_RATE;
 964                         buf[i++] = priv->dp_port_num;
 965                         buf[i++] = arg;
 966                         buf[i++] = 0;
 967                 }
 968         }
 969         /* set parity */
 970         tty->termios->c_cflag &= ~CMSPAR;
 971
 972         if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
 973                 if (cflag&PARENB) {
 974                         if (cflag&PARODD)
 975                                 arg = DIGI_PARITY_ODD;
 976                         else
 977                                 arg = DIGI_PARITY_EVEN;
 978                 } else {
 979                         arg = DIGI_PARITY_NONE;
 980                 }
 981                 buf[i++] = DIGI_CMD_SET_PARITY;
 982                 buf[i++] = priv->dp_port_num;
 983                 buf[i++] = arg;
 984                 buf[i++] = 0;
 985         }
 986         /* set word size */
 987         if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
 988                 arg = -1;
 989                 switch (cflag&CSIZE) {
 990                 case CS5: arg = DIGI_WORD_SIZE_5; break;
 991                 case CS6: arg = DIGI_WORD_SIZE_6; break;
 992                 case CS7: arg = DIGI_WORD_SIZE_7; break;
 993                 case CS8: arg = DIGI_WORD_SIZE_8; break;
 994                 default:
 995                         dbg("digi_set_termios: can't handle word size %d",
 996                                 (cflag&CSIZE));
 997                         break;
 998                 }
 999
1000                 if (arg != -1) {
1001                         buf[i++] = DIGI_CMD_SET_WORD_SIZE;
1002                         buf[i++] = priv->dp_port_num;
1003                         buf[i++] = arg;
1004                         buf[i++] = 0;
1005                 }
1006
1007         }
1008
1009         /* set stop bits */
1010         if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
1011
1012                 if ((cflag&CSTOPB))
1013                         arg = DIGI_STOP_BITS_2;
1014                 else
1015                         arg = DIGI_STOP_BITS_1;
1016
1017                 buf[i++] = DIGI_CMD_SET_STOP_BITS;
1018                 buf[i++] = priv->dp_port_num;
1019                 buf[i++] = arg;
1020                 buf[i++] = 0;
1021
1022         }
1023
1024         /* set input flow control */
1025         if ((iflag&IXOFF) != (old_iflag&IXOFF)
1026             || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
1027                 arg = 0;
1028                 if (iflag&IXOFF)
1029                         arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1030                 else
1031                         arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1032
1033                 if (cflag&CRTSCTS) {
1034                         arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
1035
1036                         /* On USB-4 it is necessary to assert RTS prior */
1037                         /* to selecting RTS input flow control.  */
1038                         buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
1039                         buf[i++] = priv->dp_port_num;
1040                         buf[i++] = DIGI_RTS_ACTIVE;
1041                         buf[i++] = 0;
1042
1043                 } else {
1044                         arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
1045                 }
1046                 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1047                 buf[i++] = priv->dp_port_num;
1048                 buf[i++] = arg;
1049                 buf[i++] = 0;
1050         }
1051
1052         /* set output flow control */
1053         if ((iflag & IXON) != (old_iflag & IXON)
1054             || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1055                 arg = 0;
1056                 if (iflag & IXON)
1057                         arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1058                 else
1059                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1060
1061                 if (cflag & CRTSCTS) {
1062                         arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
1063                 } else {
1064                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
1065                         tty->hw_stopped = 0;
1066                 }
1067
1068                 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1069                 buf[i++] = priv->dp_port_num;
1070                 buf[i++] = arg;
1071                 buf[i++] = 0;
1072         }
1073
1074         /* set receive enable/disable */
1075         if ((cflag & CREAD) != (old_cflag & CREAD)) {
1076                 if (cflag & CREAD)
1077                         arg = DIGI_ENABLE;
1078                 else
1079                         arg = DIGI_DISABLE;
1080
1081                 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
1082                 buf[i++] = priv->dp_port_num;
1083                 buf[i++] = arg;
1084                 buf[i++] = 0;
1085         }
1086         if ((ret = digi_write_oob_command(port, buf, i, 1)) != 0)
1087                 dbg("digi_set_termios: write oob failed, ret=%d", ret);
1088         tty_encode_baud_rate(tty, baud, baud);
1089 }
1090
1091
1092 static void digi_break_ctl(struct usb_serial_port *port, int break_state)
1093 {
1094         unsigned char buf[4];
1095
1096         buf[0] = DIGI_CMD_BREAK_CONTROL;
1097         buf[1] = 2;                             /* length */
1098         buf[2] = break_state ? 1 : 0;
1099         buf[3] = 0;                             /* pad */
1100         digi_write_inb_command(port, buf, 4, 0);
1101 }
1102
1103
1104 static int digi_tiocmget(struct usb_serial_port *port, struct file *file)
1105 {
1106         struct digi_port *priv = usb_get_serial_port_data(port);
1107         unsigned int val;
1108         unsigned long flags;
1109
1110         dbg("%s: TOP: port=%d", __func__, priv->dp_port_num);
1111
1112         spin_lock_irqsave(&priv->dp_port_lock, flags);
1113         val = priv->dp_modem_signals;
1114         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1115         return val;
1116 }
1117
1118
1119 static int digi_tiocmset(struct usb_serial_port *port, struct file *file,
1120         unsigned int set, unsigned int clear)
1121 {
1122         struct digi_port *priv = usb_get_serial_port_data(port);
1123         unsigned int val;
1124         unsigned long flags;
1125
1126         dbg("%s: TOP: port=%d", __func__, priv->dp_port_num);
1127
1128         spin_lock_irqsave(&priv->dp_port_lock, flags);
1129         val = (priv->dp_modem_signals & ~clear) | set;
1130         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1131         return digi_set_modem_signals(port, val, 1);
1132 }
1133
1134
1135 static int digi_ioctl(struct usb_serial_port *port, struct file *file,
1136         unsigned int cmd, unsigned long arg)
1137 {
1138         struct digi_port *priv = usb_get_serial_port_data(port);
1139         dbg("digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd);
1140
1141         switch (cmd) {
1142         case TIOCMIWAIT:
1143                 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
1144                 /* TODO */
1145                 return 0;
1146         case TIOCGICOUNT:
1147                 /* return count of modemline transitions */
1148                 /* TODO */
1149                 return 0;
1150         }
1151         return -ENOIOCTLCMD;
1152
1153 }
1154
1155 static int digi_write(struct usb_serial_port *port, const unsigned char *buf, int count)
1156 {
1157
1158         int ret,data_len,new_len;
1159         struct digi_port *priv = usb_get_serial_port_data(port);
1160         unsigned char *data = port->write_urb->transfer_buffer;
1161         unsigned long flags = 0;
1162
1163         dbg("digi_write: TOP: port=%d, count=%d, in_interrupt=%ld",
1164                 priv->dp_port_num, count, in_interrupt());
1165
1166         /* copy user data (which can sleep) before getting spin lock */
1167         count = min(count, port->bulk_out_size-2);
1168         count = min(64, count);
1169
1170         /* be sure only one write proceeds at a time */
1171         /* there are races on the port private buffer */
1172         /* and races to check write_urb->status */
1173         spin_lock_irqsave(&priv->dp_port_lock, flags);
1174
1175         /* wait for urb status clear to submit another urb */
1176         if (port->write_urb->status == -EINPROGRESS || priv->dp_write_urb_in_use) {
1177                 /* buffer data if count is 1 (probably put_char) if possible */
1178                 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
1179                         priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
1180                         new_len = 1;
1181                 } else {
1182                         new_len = 0;
1183                 }
1184                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1185                 return new_len;
1186         }
1187
1188         /* allow space for any buffered data and for new data, up to */
1189         /* transfer buffer size - 2 (for command and length bytes) */
1190         new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
1191         data_len = new_len + priv->dp_out_buf_len;
1192
1193         if (data_len == 0) {
1194                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1195                 return 0;
1196         }
1197
1198         port->write_urb->transfer_buffer_length = data_len+2;
1199         port->write_urb->dev = port->serial->dev;
1200
1201         *data++ = DIGI_CMD_SEND_DATA;
1202         *data++ = data_len;
1203
1204         /* copy in buffered data first */
1205         memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
1206         data += priv->dp_out_buf_len;
1207
1208         /* copy in new data */
1209         memcpy(data, buf, new_len);
1210
1211         if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0) {
1212                 priv->dp_write_urb_in_use = 1;
1213                 ret = new_len;
1214                 priv->dp_out_buf_len = 0;
1215         }
1216
1217         /* return length of new data written, or error */
1218         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1219         if (ret < 0)
1220                 err("%s: usb_submit_urb failed, ret=%d, port=%d",
1221                         __func__, ret, priv->dp_port_num);
1222         dbg("digi_write: returning %d", ret);
1223         return ret;
1224
1225 }
1226
1227 static void digi_write_bulk_callback(struct urb *urb)
1228 {
1229
1230         struct usb_serial_port *port = urb->context;
1231         struct usb_serial *serial;
1232         struct digi_port *priv;
1233         struct digi_serial *serial_priv;
1234         int ret = 0;
1235         int status = urb->status;
1236
1237         dbg("digi_write_bulk_callback: TOP, urb->status=%d", status);
1238
1239         /* port and serial sanity check */
1240         if (port == NULL || (priv=usb_get_serial_port_data(port)) == NULL) {
1241                 err("%s: port or port->private is NULL, status=%d",
1242                     __func__, status);
1243                 return;
1244         }
1245         serial = port->serial;
1246         if (serial == NULL || (serial_priv=usb_get_serial_data(serial)) == NULL) {
1247                 err("%s: serial or serial->private is NULL, status=%d",
1248                     __func__, status);
1249                 return;
1250         }
1251
1252         /* handle oob callback */
1253         if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1254                 dbg("digi_write_bulk_callback: oob callback");
1255                 spin_lock(&priv->dp_port_lock);
1256                 priv->dp_write_urb_in_use = 0;
1257                 wake_up_interruptible(&port->write_wait);
1258                 spin_unlock(&priv->dp_port_lock);
1259                 return;
1260         }
1261
1262         /* try to send any buffered data on this port, if it is open */
1263         spin_lock(&priv->dp_port_lock);
1264         priv->dp_write_urb_in_use = 0;
1265         if (port->open_count && port->write_urb->status != -EINPROGRESS
1266             && priv->dp_out_buf_len > 0) {
1267                 *((unsigned char *)(port->write_urb->transfer_buffer))
1268                         = (unsigned char)DIGI_CMD_SEND_DATA;
1269                 *((unsigned char *)(port->write_urb->transfer_buffer)+1)
1270                         = (unsigned char)priv->dp_out_buf_len;
1271                 port->write_urb->transfer_buffer_length = priv->dp_out_buf_len+2;
1272                 port->write_urb->dev = serial->dev;
1273                 memcpy(port->write_urb->transfer_buffer+2, priv->dp_out_buf,
1274                         priv->dp_out_buf_len);
1275                 if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0) {
1276                         priv->dp_write_urb_in_use = 1;
1277                         priv->dp_out_buf_len = 0;
1278                 }
1279         }
1280         /* wake up processes sleeping on writes immediately */
1281         digi_wakeup_write(port);
1282         /* also queue up a wakeup at scheduler time, in case we */
1283         /* lost the race in write_chan(). */
1284         schedule_work(&priv->dp_wakeup_work);
1285
1286         spin_unlock(&priv->dp_port_lock);
1287         if (ret)
1288                 err("%s: usb_submit_urb failed, ret=%d, port=%d",
1289                         __func__, ret, priv->dp_port_num);
1290 }
1291
1292 static int digi_write_room(struct usb_serial_port *port)
1293 {
1294
1295         int room;
1296         struct digi_port *priv = usb_get_serial_port_data(port);
1297         unsigned long flags = 0;
1298
1299         spin_lock_irqsave(&priv->dp_port_lock, flags);
1300
1301         if (port->write_urb->status == -EINPROGRESS || priv->dp_write_urb_in_use)
1302                 room = 0;
1303         else
1304                 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1305
1306         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1307         dbg("digi_write_room: port=%d, room=%d", priv->dp_port_num, room);
1308         return room;
1309
1310 }
1311
1312 static int digi_chars_in_buffer(struct usb_serial_port *port)
1313 {
1314
1315         struct digi_port *priv = usb_get_serial_port_data(port);
1316
1317
1318         if (port->write_urb->status == -EINPROGRESS
1319             || priv->dp_write_urb_in_use) {
1320                 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1321                         priv->dp_port_num, port->bulk_out_size - 2);
1322                 /* return(port->bulk_out_size - 2); */
1323                 return 256;
1324         } else {
1325                 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1326                         priv->dp_port_num, priv->dp_out_buf_len);
1327                 return priv->dp_out_buf_len;
1328         }
1329
1330 }
1331
1332
1333 static int digi_open(struct usb_serial_port *port, struct file *filp)
1334 {
1335         int ret;
1336         unsigned char buf[32];
1337         struct digi_port *priv = usb_get_serial_port_data(port);
1338         struct ktermios not_termios;
1339         unsigned long flags = 0;
1340
1341         dbg("digi_open: TOP: port=%d, open_count=%d",
1342                 priv->dp_port_num, port->open_count);
1343
1344         /* be sure the device is started up */
1345         if (digi_startup_device(port->serial) != 0)
1346                 return -ENXIO;
1347
1348         spin_lock_irqsave(&priv->dp_port_lock, flags);
1349
1350         /* don't wait on a close in progress for non-blocking opens */
1351         if (priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) {
1352                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1353                 return -EAGAIN;
1354         }
1355
1356         /* wait for a close in progress to finish */
1357         while(priv->dp_in_close) {
1358                 cond_wait_interruptible_timeout_irqrestore(
1359                         &priv->dp_close_wait, DIGI_RETRY_TIMEOUT,
1360                         &priv->dp_port_lock, flags);
1361                 if (signal_pending(current))
1362                         return -EINTR;
1363                 spin_lock_irqsave(&priv->dp_port_lock, flags);
1364         }
1365
1366         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1367
1368         /* read modem signals automatically whenever they change */
1369         buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1370         buf[1] = priv->dp_port_num;
1371         buf[2] = DIGI_ENABLE;
1372         buf[3] = 0;
1373
1374         /* flush fifos */
1375         buf[4] = DIGI_CMD_IFLUSH_FIFO;
1376         buf[5] = priv->dp_port_num;
1377         buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1378         buf[7] = 0;
1379
1380         if ((ret = digi_write_oob_command(port, buf, 8, 1)) != 0)
1381                 dbg("digi_open: write oob failed, ret=%d", ret);
1382
1383         /* set termios settings */
1384         not_termios.c_cflag = ~port->tty->termios->c_cflag;
1385         not_termios.c_iflag = ~port->tty->termios->c_iflag;
1386         digi_set_termios(port, &not_termios);
1387
1388         /* set DTR and RTS */
1389         digi_set_modem_signals(port, TIOCM_DTR|TIOCM_RTS, 1);
1390
1391         return 0;
1392 }
1393
1394
1395 static void digi_close(struct usb_serial_port *port, struct file *filp)
1396 {
1397         DEFINE_WAIT(wait);
1398         int ret;
1399         unsigned char buf[32];
1400         struct tty_struct *tty = port->tty;
1401         struct digi_port *priv = usb_get_serial_port_data(port);
1402
1403         dbg("digi_close: TOP: port=%d, open_count=%d",
1404                 priv->dp_port_num, port->open_count);
1405
1406         mutex_lock(&port->serial->disc_mutex);
1407         /* if disconnected, just clear flags */
1408         if (port->serial->disconnected)
1409                 goto exit;
1410
1411         /* do cleanup only after final close on this port */
1412         spin_lock_irq(&priv->dp_port_lock);
1413         priv->dp_in_close = 1;
1414         spin_unlock_irq(&priv->dp_port_lock);
1415
1416         /* tell line discipline to process only XON/XOFF */
1417         tty->closing = 1;
1418
1419         /* wait for output to drain */
1420         if ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0)
1421                 tty_wait_until_sent(tty, DIGI_CLOSE_TIMEOUT);
1422
1423         /* flush driver and line discipline buffers */
1424         if (tty->driver->flush_buffer)
1425                 tty->driver->flush_buffer(tty);
1426         tty_ldisc_flush(tty);
1427
1428         if (port->serial->dev) {
1429                 /* wait for transmit idle */
1430                 if ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) {
1431                         digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1432                 }
1433                 /* drop DTR and RTS */
1434                 digi_set_modem_signals(port, 0, 0);
1435
1436                 /* disable input flow control */
1437                 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1438                 buf[1] = priv->dp_port_num;
1439                 buf[2] = DIGI_DISABLE;
1440                 buf[3] = 0;
1441
1442                 /* disable output flow control */
1443                 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1444                 buf[5] = priv->dp_port_num;
1445                 buf[6] = DIGI_DISABLE;
1446                 buf[7] = 0;
1447
1448                 /* disable reading modem signals automatically */
1449                 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1450                 buf[9] = priv->dp_port_num;
1451                 buf[10] = DIGI_DISABLE;
1452                 buf[11] = 0;
1453
1454                 /* disable receive */
1455                 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1456                 buf[13] = priv->dp_port_num;
1457                 buf[14] = DIGI_DISABLE;
1458                 buf[15] = 0;
1459
1460                 /* flush fifos */
1461                 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1462                 buf[17] = priv->dp_port_num;
1463                 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1464                 buf[19] = 0;
1465
1466                 if ((ret = digi_write_oob_command(port, buf, 20, 0)) != 0)
1467                         dbg("digi_close: write oob failed, ret=%d", ret);
1468
1469                 /* wait for final commands on oob port to complete */
1470                 prepare_to_wait(&priv->dp_flush_wait, &wait, TASK_INTERRUPTIBLE);
1471                 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1472                 finish_wait(&priv->dp_flush_wait, &wait);
1473
1474                 /* shutdown any outstanding bulk writes */
1475                 usb_kill_urb(port->write_urb);
1476         }
1477         tty->closing = 0;
1478 exit:
1479         spin_lock_irq(&priv->dp_port_lock);
1480         priv->dp_write_urb_in_use = 0;
1481         priv->dp_in_close = 0;
1482         wake_up_interruptible(&priv->dp_close_wait);
1483         spin_unlock_irq(&priv->dp_port_lock);
1484         mutex_unlock(&port->serial->disc_mutex);
1485         dbg("digi_close: done");
1486 }
1487
1488
1489 /*
1490 *  Digi Startup Device
1491 *
1492 *  Starts reads on all ports.  Must be called AFTER startup, with
1493 *  urbs initialized.  Returns 0 if successful, non-zero error otherwise.
1494 */
1495
1496 static int digi_startup_device(struct usb_serial *serial)
1497 {
1498         int i,ret = 0;
1499         struct digi_serial *serial_priv = usb_get_serial_data(serial);
1500         struct usb_serial_port *port;
1501
1502         /* be sure this happens exactly once */
1503         spin_lock(&serial_priv->ds_serial_lock);
1504         if (serial_priv->ds_device_started) {
1505                 spin_unlock(&serial_priv->ds_serial_lock);
1506                 return 0;
1507         }
1508         serial_priv->ds_device_started = 1;
1509         spin_unlock(&serial_priv->ds_serial_lock);
1510
1511         /* start reading from each bulk in endpoint for the device */
1512         /* set USB_DISABLE_SPD flag for write bulk urbs */
1513         for (i = 0; i < serial->type->num_ports + 1; i++) {
1514                 port = serial->port[i];
1515                 port->write_urb->dev = port->serial->dev;
1516                 if ((ret = usb_submit_urb(port->read_urb, GFP_KERNEL)) != 0) {
1517                         err("%s: usb_submit_urb failed, ret=%d, port=%d",
1518                                         __func__, ret, i);
1519                         break;
1520                 }
1521         }
1522         return ret;
1523 }
1524
1525
1526 static int digi_startup(struct usb_serial *serial)
1527 {
1528
1529         int i;
1530         struct digi_port *priv;
1531         struct digi_serial *serial_priv;
1532
1533         dbg("digi_startup: TOP");
1534
1535         /* allocate the private data structures for all ports */
1536         /* number of regular ports + 1 for the out-of-band port */
1537         for(i = 0; i < serial->type->num_ports + 1; i++) {
1538                 /* allocate port private structure */
1539                 priv = kmalloc(sizeof(struct digi_port), GFP_KERNEL);
1540                 if (priv == NULL) {
1541                         while (--i >= 0)
1542                                 kfree(usb_get_serial_port_data(serial->port[i]));
1543                         return 1;                       /* error */
1544                 }
1545
1546                 /* initialize port private structure */
1547                 spin_lock_init(&priv->dp_port_lock);
1548                 priv->dp_port_num = i;
1549                 priv->dp_out_buf_len = 0;
1550                 priv->dp_write_urb_in_use = 0;
1551                 priv->dp_modem_signals = 0;
1552                 init_waitqueue_head(&priv->dp_modem_change_wait);
1553                 priv->dp_transmit_idle = 0;
1554                 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1555                 priv->dp_throttled = 0;
1556                 priv->dp_throttle_restart = 0;
1557                 init_waitqueue_head(&priv->dp_flush_wait);
1558                 priv->dp_in_close = 0;
1559                 init_waitqueue_head(&priv->dp_close_wait);
1560                 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1561                 priv->dp_port = serial->port[i];
1562                 /* initialize write wait queue for this port */
1563                 init_waitqueue_head(&serial->port[i]->write_wait);
1564
1565                 usb_set_serial_port_data(serial->port[i], priv);
1566         }
1567
1568         /* allocate serial private structure */
1569         serial_priv = kmalloc(sizeof(struct digi_serial), GFP_KERNEL);
1570         if (serial_priv == NULL) {
1571                 for (i = 0; i < serial->type->num_ports + 1; i++)
1572                         kfree(usb_get_serial_port_data(serial->port[i]));
1573                 return 1;                       /* error */
1574         }
1575
1576         /* initialize serial private structure */
1577         spin_lock_init(&serial_priv->ds_serial_lock);
1578         serial_priv->ds_oob_port_num = serial->type->num_ports;
1579         serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1580         serial_priv->ds_device_started = 0;
1581         usb_set_serial_data(serial, serial_priv);
1582
1583         return 0;
1584 }
1585
1586
1587 static void digi_shutdown(struct usb_serial *serial)
1588 {
1589         int i;
1590         dbg("digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt());
1591
1592         /* stop reads and writes on all ports */
1593         for (i = 0; i < serial->type->num_ports + 1; i++) {
1594                 usb_kill_urb(serial->port[i]->read_urb);
1595                 usb_kill_urb(serial->port[i]->write_urb);
1596         }
1597
1598         /* free the private data structures for all ports */
1599         /* number of regular ports + 1 for the out-of-band port */
1600         for(i = 0; i < serial->type->num_ports + 1; i++)
1601                 kfree(usb_get_serial_port_data(serial->port[i]));
1602         kfree(usb_get_serial_data(serial));
1603 }
1604
1605
1606 static void digi_read_bulk_callback(struct urb *urb)
1607 {
1608         struct usb_serial_port *port = urb->context;
1609         struct digi_port *priv;
1610         struct digi_serial *serial_priv;
1611         int ret;
1612         int status = urb->status;
1613
1614         dbg("digi_read_bulk_callback: TOP");
1615
1616         /* port sanity check, do not resubmit if port is not valid */
1617         if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
1618                 err("%s: port or port->private is NULL, status=%d",
1619                     __func__, status);
1620                 return;
1621         }
1622         if (port->serial == NULL ||
1623                 (serial_priv=usb_get_serial_data(port->serial)) == NULL) {
1624                 err("%s: serial is bad or serial->private is NULL, status=%d",
1625                         __func__, status);
1626                 return;
1627         }
1628
1629         /* do not resubmit urb if it has any status error */
1630         if (status) {
1631                 err("%s: nonzero read bulk status: status=%d, port=%d",
1632                     __func__, status, priv->dp_port_num);
1633                 return;
1634         }
1635
1636         /* handle oob or inb callback, do not resubmit if error */
1637         if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1638                 if (digi_read_oob_callback(urb) != 0)
1639                         return;
1640         } else {
1641                 if (digi_read_inb_callback(urb) != 0)
1642                         return;
1643         }
1644
1645         /* continue read */
1646         urb->dev = port->serial->dev;
1647         if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) != 0) {
1648                 err("%s: failed resubmitting urb, ret=%d, port=%d",
1649                     __func__, ret, priv->dp_port_num);
1650         }
1651
1652 }
1653
1654 /*
1655 *  Digi Read INB Callback
1656 *
1657 *  Digi Read INB Callback handles reads on the in band ports, sending
1658 *  the data on to the tty subsystem.  When called we know port and
1659 *  port->private are not NULL and port->serial has been validated.
1660 *  It returns 0 if successful, 1 if successful but the port is
1661 *  throttled, and -1 if the sanity checks failed.
1662 */
1663
1664 static int digi_read_inb_callback(struct urb *urb)
1665 {
1666
1667         struct usb_serial_port *port = urb->context;
1668         struct tty_struct *tty = port->tty;
1669         struct digi_port *priv = usb_get_serial_port_data(port);
1670         int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1671         int len = ((unsigned char *)urb->transfer_buffer)[1];
1672         int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1673         unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3;
1674         int flag,throttled;
1675         int i;
1676         int status = urb->status;
1677
1678         /* do not process callbacks on closed ports */
1679         /* but do continue the read chain */
1680         if (port->open_count == 0)
1681                 return 0;
1682
1683         /* short/multiple packet check */
1684         if (urb->actual_length != len + 2) {
1685                 err("%s: INCOMPLETE OR MULTIPLE PACKET, urb->status=%d, "
1686                     "port=%d, opcode=%d, len=%d, actual_length=%d, "
1687                     "status=%d", __func__, status, priv->dp_port_num,
1688                     opcode, len, urb->actual_length, port_status);
1689                 return -1;
1690         }
1691
1692         spin_lock(&priv->dp_port_lock);
1693
1694         /* check for throttle; if set, do not resubmit read urb */
1695         /* indicate the read chain needs to be restarted on unthrottle */
1696         throttled = priv->dp_throttled;
1697         if (throttled)
1698                 priv->dp_throttle_restart = 1;
1699
1700         /* receive data */
1701         if (opcode == DIGI_CMD_RECEIVE_DATA) {
1702                 /* get flag from port_status */
1703                 flag = 0;
1704
1705                 /* overrun is special, not associated with a char */
1706                 if (port_status & DIGI_OVERRUN_ERROR)
1707                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1708
1709                 /* break takes precedence over parity, */
1710                 /* which takes precedence over framing errors */
1711                 if (port_status & DIGI_BREAK_ERROR)
1712                         flag = TTY_BREAK;
1713                 else if (port_status & DIGI_PARITY_ERROR)
1714                         flag = TTY_PARITY;
1715                 else if (port_status & DIGI_FRAMING_ERROR)
1716                         flag = TTY_FRAME;
1717
1718                 /* data length is len-1 (one byte of len is port_status) */
1719                 --len;
1720
1721                 len = tty_buffer_request_room(tty, len);
1722                 if (len > 0) {
1723                         /* Hot path */
1724                         if (flag == TTY_NORMAL)
1725                                 tty_insert_flip_string(tty, data, len);
1726                         else {
1727                                 for(i = 0; i < len; i++)
1728                                         tty_insert_flip_char(tty, data[i], flag);
1729                         }
1730                         tty_flip_buffer_push(tty);
1731                 }
1732         }
1733         spin_unlock(&priv->dp_port_lock);
1734
1735         if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1736                 dbg("%s: got RECEIVE_DISABLE", __func__);
1737         else if (opcode != DIGI_CMD_RECEIVE_DATA)
1738                 dbg("%s: unknown opcode: %d", __func__, opcode);
1739
1740         return(throttled ? 1 : 0);
1741
1742 }
1743
1744
1745 /*
1746 *  Digi Read OOB Callback
1747 *
1748 *  Digi Read OOB Callback handles reads on the out of band port.
1749 *  When called we know port and port->private are not NULL and
1750 *  the port->serial is valid.  It returns 0 if successful, and
1751 *  -1 if the sanity checks failed.
1752 */
1753
1754 static int digi_read_oob_callback(struct urb *urb)
1755 {
1756
1757         struct usb_serial_port *port = urb->context;
1758         struct usb_serial *serial = port->serial;
1759         struct digi_port *priv = usb_get_serial_port_data(port);
1760         int opcode, line, status, val;
1761         int i;
1762
1763         dbg("digi_read_oob_callback: port=%d, len=%d",
1764                         priv->dp_port_num, urb->actual_length);
1765
1766         /* handle each oob command */
1767         for(i = 0; i < urb->actual_length - 3;) {
1768                 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1769                 line = ((unsigned char *)urb->transfer_buffer)[i++];
1770                 status = ((unsigned char *)urb->transfer_buffer)[i++];
1771                 val = ((unsigned char *)urb->transfer_buffer)[i++];
1772
1773                 dbg("digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1774                         opcode, line, status, val);
1775
1776                 if (status != 0 || line >= serial->type->num_ports)
1777                         continue;
1778
1779                 port = serial->port[line];
1780
1781                 if ((priv=usb_get_serial_port_data(port)) == NULL)
1782                         return -1;
1783
1784                 if (opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1785                         spin_lock(&priv->dp_port_lock);
1786                         /* convert from digi flags to termiox flags */
1787                         if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1788                                 priv->dp_modem_signals |= TIOCM_CTS;
1789                                 /* port must be open to use tty struct */
1790                                 if (port->open_count
1791                                         && port->tty->termios->c_cflag & CRTSCTS) {
1792                                         port->tty->hw_stopped = 0;
1793                                         digi_wakeup_write(port);
1794                                 }
1795                         } else {
1796                                 priv->dp_modem_signals &= ~TIOCM_CTS;
1797                                 /* port must be open to use tty struct */
1798                                 if (port->open_count
1799                                         && port->tty->termios->c_cflag & CRTSCTS) {
1800                                         port->tty->hw_stopped = 1;
1801                                 }
1802                         }
1803                         if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1804                                 priv->dp_modem_signals |= TIOCM_DSR;
1805                         else
1806                                 priv->dp_modem_signals &= ~TIOCM_DSR;
1807                         if (val & DIGI_READ_INPUT_SIGNALS_RI)
1808                                 priv->dp_modem_signals |= TIOCM_RI;
1809                         else
1810                                 priv->dp_modem_signals &= ~TIOCM_RI;
1811                         if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1812                                 priv->dp_modem_signals |= TIOCM_CD;
1813                         else
1814                                 priv->dp_modem_signals &= ~TIOCM_CD;
1815
1816                         wake_up_interruptible(&priv->dp_modem_change_wait);
1817                         spin_unlock(&priv->dp_port_lock);
1818                 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1819                         spin_lock(&priv->dp_port_lock);
1820                         priv->dp_transmit_idle = 1;
1821                         wake_up_interruptible(&priv->dp_transmit_idle_wait);
1822                         spin_unlock(&priv->dp_port_lock);
1823                 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1824                         wake_up_interruptible(&priv->dp_flush_wait);
1825                 }
1826         }
1827         return 0;
1828
1829 }
1830
1831 static int __init digi_init(void)
1832 {
1833         int retval;
1834         retval = usb_serial_register(&digi_acceleport_2_device);
1835         if (retval)
1836                 goto failed_acceleport_2_device;
1837         retval = usb_serial_register(&digi_acceleport_4_device);
1838         if (retval)
1839                 goto failed_acceleport_4_device;
1840         retval = usb_register(&digi_driver);
1841         if (retval)
1842                 goto failed_usb_register;
1843         info(DRIVER_VERSION ":" DRIVER_DESC);
1844         return 0;
1845 failed_usb_register:
1846         usb_serial_deregister(&digi_acceleport_4_device);
1847 failed_acceleport_4_device:
1848         usb_serial_deregister(&digi_acceleport_2_device);
1849 failed_acceleport_2_device:
1850         return retval;
1851 }
1852
1853 static void __exit digi_exit (void)
1854 {
1855         usb_deregister(&digi_driver);
1856         usb_serial_deregister(&digi_acceleport_2_device);
1857         usb_serial_deregister(&digi_acceleport_4_device);
1858 }
1859
1860
1861 module_init(digi_init);
1862 module_exit(digi_exit);
1863
1864
1865 MODULE_AUTHOR(DRIVER_AUTHOR);
1866 MODULE_DESCRIPTION(DRIVER_DESC);
1867 MODULE_LICENSE("GPL");
1868
1869 module_param(debug, bool, S_IRUGO | S_IWUSR);
1870 MODULE_PARM_DESC(debug, "Debug enabled or not");