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 asynchonously 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/config.h>
 237 #include <linux/kernel.h>
 238 #include <linux/errno.h>
 239 #include <linux/init.h>
 240 #include <linux/slab.h>
 241 #include <linux/tty.h>
 242 #include <linux/tty_driver.h>
 243 #include <linux/tty_flip.h>
 244 #include <linux/module.h>
 245 #include <linux/spinlock.h>
 246 #include <linux/workqueue.h>
 247 #include <asm/uaccess.h>
 248 #include <linux/usb.h>
 249 #include "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_in_buf_len;
 420         unsigned char dp_in_buf[DIGI_IN_BUF_SIZE];
 421         unsigned char dp_in_flag_buf[DIGI_IN_BUF_SIZE];
 422         int dp_write_urb_in_use;
 423         unsigned int dp_modem_signals;
 424         wait_queue_head_t dp_modem_change_wait;
 425         int dp_transmit_idle;
 426         wait_queue_head_t dp_transmit_idle_wait;
 427         int dp_throttled;
 428         int dp_throttle_restart;
 429         wait_queue_head_t dp_flush_wait;
 430         int dp_in_close;                        /* close in progress */
 431         wait_queue_head_t dp_close_wait;        /* wait queue for close */
 432         struct work_struct dp_wakeup_work;
 433 };
 434
 435
 436 /* Local Function Declarations */
 437
 438 static void digi_wakeup_write( struct usb_serial_port *port );
 439 static void digi_wakeup_write_lock(void *);
 440 static int digi_write_oob_command( struct usb_serial_port *port,
 441         unsigned char *buf, int count, int interruptible );
 442 static int digi_write_inb_command( struct usb_serial_port *port,
 443         unsigned char *buf, int count, unsigned long timeout );
 444 static int digi_set_modem_signals( struct usb_serial_port *port,
 445         unsigned int modem_signals, int interruptible );
 446 static int digi_transmit_idle( struct usb_serial_port *port,
 447         unsigned long timeout );
 448 static void digi_rx_throttle (struct usb_serial_port *port);
 449 static void digi_rx_unthrottle (struct usb_serial_port *port);
 450 static void digi_set_termios( struct usb_serial_port *port,
 451         struct termios *old_termios );
 452 static void digi_break_ctl( struct usb_serial_port *port, int break_state );
 453 static int digi_ioctl( struct usb_serial_port *port, struct file *file,
 454         unsigned int cmd, unsigned long arg );
 455 static int digi_tiocmget( struct usb_serial_port *port, struct file *file );
 456 static int digi_tiocmset( struct usb_serial_port *port, struct file *file,
 457         unsigned int set, unsigned int clear );
 458 static int digi_write( struct usb_serial_port *port, const unsigned char *buf, int count );
 459 static void digi_write_bulk_callback( struct urb *urb, struct pt_regs *regs );
 460 static int digi_write_room( struct usb_serial_port *port );
 461 static int digi_chars_in_buffer( struct usb_serial_port *port );
 462 static int digi_open( struct usb_serial_port *port, struct file *filp );
 463 static void digi_close( struct usb_serial_port *port, struct file *filp );
 464 static int digi_startup_device( struct usb_serial *serial );
 465 static int digi_startup( struct usb_serial *serial );
 466 static void digi_shutdown( struct usb_serial *serial );
 467 static void digi_read_bulk_callback( struct urb *urb, struct pt_regs *regs );
 468 static int digi_read_inb_callback( struct urb *urb );
 469 static int digi_read_oob_callback( struct urb *urb );
 470
 471
 472 /* Statics */
 473
 474 static int debug;
 475
 476 static struct usb_device_id id_table_combined [] = {
 477         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
 478         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
 479         { }                                             /* Terminating entry */
 480 };
 481
 482 static struct usb_device_id id_table_2 [] = {
 483         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
 484         { }                                             /* Terminating entry */
 485 };
 486
 487 static struct usb_device_id id_table_4 [] = {
 488         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
 489         { }                                             /* Terminating entry */
 490 };
 491
 492 MODULE_DEVICE_TABLE (usb, id_table_combined);
 493
 494 static struct usb_driver digi_driver = {
 495         .owner =        THIS_MODULE,
 496         .name =         "digi_acceleport",
 497         .probe =        usb_serial_probe,
 498         .disconnect =   usb_serial_disconnect,
 499         .id_table =     id_table_combined,
 500 };
 501
 502
 503 /* device info needed for the Digi serial converter */
 504
 505 static struct usb_serial_device_type digi_acceleport_2_device = {
 506         .owner =                        THIS_MODULE,
 507         .name =                         "Digi 2 port USB adapter",
 508         .short_name =                   "digi_2",
 509         .id_table =                     id_table_2,
 510         .num_interrupt_in =             0,
 511         .num_bulk_in =                  4,
 512         .num_bulk_out =                 4,
 513         .num_ports =                    3,
 514         .open =                         digi_open,
 515         .close =                        digi_close,
 516         .write =                        digi_write,
 517         .write_room =                   digi_write_room,
 518         .write_bulk_callback =          digi_write_bulk_callback,
 519         .read_bulk_callback =           digi_read_bulk_callback,
 520         .chars_in_buffer =              digi_chars_in_buffer,
 521         .throttle =                     digi_rx_throttle,
 522         .unthrottle =                   digi_rx_unthrottle,
 523         .ioctl =                        digi_ioctl,
 524         .set_termios =                  digi_set_termios,
 525         .break_ctl =                    digi_break_ctl,
 526         .tiocmget =                     digi_tiocmget,
 527         .tiocmset =                     digi_tiocmset,
 528         .attach =                       digi_startup,
 529         .shutdown =                     digi_shutdown,
 530 };
 531
 532 static struct usb_serial_device_type digi_acceleport_4_device = {
 533         .owner =                        THIS_MODULE,
 534         .name =                         "Digi 4 port USB adapter",
 535         .short_name =                   "digi_4",
 536         .id_table =                     id_table_4,
 537         .num_interrupt_in =             0,
 538         .num_bulk_in =                  5,
 539         .num_bulk_out =                 5,
 540         .num_ports =                    4,
 541         .open =                         digi_open,
 542         .close =                        digi_close,
 543         .write =                        digi_write,
 544         .write_room =                   digi_write_room,
 545         .write_bulk_callback =          digi_write_bulk_callback,
 546         .read_bulk_callback =           digi_read_bulk_callback,
 547         .chars_in_buffer =              digi_chars_in_buffer,
 548         .throttle =                     digi_rx_throttle,
 549         .unthrottle =                   digi_rx_unthrottle,
 550         .ioctl =                        digi_ioctl,
 551         .set_termios =                  digi_set_termios,
 552         .break_ctl =                    digi_break_ctl,
 553         .tiocmget =                     digi_tiocmget,
 554         .tiocmset =                     digi_tiocmset,
 555         .attach =                       digi_startup,
 556         .shutdown =                     digi_shutdown,
 557 };
 558
 559
 560 /* Functions */
 561
 562 /*
 563 *  Cond Wait Interruptible Timeout Irqrestore
 564 *
 565 *  Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
 566 *  so that wake ups are not lost if they occur between the unlock
 567 *  and the sleep.  In other words, spin_unlock_irqrestore and
 568 *  interruptible_sleep_on_timeout are "atomic" with respect to
 569 *  wake ups.  This is used to implement condition variables.
 570 */
 571
 572 static inline long cond_wait_interruptible_timeout_irqrestore(
 573         wait_queue_head_t *q, long timeout,
 574         spinlock_t *lock, unsigned long flags )
 575 {
 576
 577         wait_queue_t wait;
 578
 579
 580         init_waitqueue_entry( &wait, current );
 581
 582         set_current_state( TASK_INTERRUPTIBLE );
 583
 584         add_wait_queue( q, &wait );
 585
 586         spin_unlock_irqrestore( lock, flags );
 587
 588         timeout = schedule_timeout(timeout);
 589
 590         remove_wait_queue( q, &wait );
 591
 592         return( timeout );
 593
 594 }
 595
 596
 597 /*
 598 *  Digi Wakeup Write
 599 *
 600 *  Wake up port, line discipline, and tty processes sleeping
 601 *  on writes.
 602 */
 603
 604 static void digi_wakeup_write_lock(void *arg)
 605 {
 606         struct usb_serial_port *port = arg;
 607         unsigned long flags;
 608         struct digi_port *priv = usb_get_serial_port_data(port);
 609
 610
 611         spin_lock_irqsave( &priv->dp_port_lock, flags );
 612         digi_wakeup_write( port );
 613         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
 614 }
 615
 616 static void digi_wakeup_write( struct usb_serial_port *port )
 617 {
 618
 619         struct tty_struct *tty = port->tty;
 620
 621
 622         /* wake up port processes */
 623         wake_up_interruptible( &port->write_wait );
 624
 625         /* wake up line discipline */
 626         tty_wakeup(tty);
 627 }
 628
 629
 630 /*
 631 *  Digi Write OOB Command
 632 *
 633 *  Write commands on the out of band port.  Commands are 4
 634 *  bytes each, multiple commands can be sent at once, and
 635 *  no command will be split across USB packets.  Returns 0
 636 *  if successful, -EINTR if interrupted while sleeping and
 637 *  the interruptible flag is true, or a negative error
 638 *  returned by usb_submit_urb.
 639 */
 640
 641 static int digi_write_oob_command( struct usb_serial_port *port,
 642         unsigned char *buf, int count, int interruptible )
 643 {
 644
 645         int ret = 0;
 646         int len;
 647         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 648         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 649         unsigned long flags = 0;
 650
 651
 652 dbg( "digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count );
 653
 654         spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
 655
 656         while( count > 0 ) {
 657
 658                 while( oob_port->write_urb->status == -EINPROGRESS
 659                 || oob_priv->dp_write_urb_in_use ) {
 660                         cond_wait_interruptible_timeout_irqrestore(
 661                                 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
 662                                 &oob_priv->dp_port_lock, flags );
 663                         if( interruptible && signal_pending(current) ) {
 664                                 return( -EINTR );
 665                         }
 666                         spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
 667                 }
 668
 669                 /* len must be a multiple of 4, so commands are not split */
 670                 len = min(count, oob_port->bulk_out_size );
 671                 if( len > 4 )
 672                         len &= ~3;
 673
 674                 memcpy( oob_port->write_urb->transfer_buffer, buf, len );
 675                 oob_port->write_urb->transfer_buffer_length = len;
 676                 oob_port->write_urb->dev = port->serial->dev;
 677
 678                 if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) {
 679                         oob_priv->dp_write_urb_in_use = 1;
 680                         count -= len;
 681                         buf += len;
 682                 }
 683
 684         }
 685
 686         spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags );
 687
 688         if( ret ) {
 689                 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__,
 690                         ret );
 691         }
 692
 693         return( ret );
 694
 695 }
 696
 697
 698 /*
 699 *  Digi Write In Band Command
 700 *
 701 *  Write commands on the given port.  Commands are 4
 702 *  bytes each, multiple commands can be sent at once, and
 703 *  no command will be split across USB packets.  If timeout
 704 *  is non-zero, write in band command will return after
 705 *  waiting unsuccessfully for the URB status to clear for
 706 *  timeout ticks.  Returns 0 if successful, or a negative
 707 *  error returned by digi_write.
 708 */
 709
 710 static int digi_write_inb_command( struct usb_serial_port *port,
 711         unsigned char *buf, int count, unsigned long timeout )
 712 {
 713
 714         int ret = 0;
 715         int len;
 716         struct digi_port *priv = usb_get_serial_port_data(port);
 717         unsigned char *data = port->write_urb->transfer_buffer;
 718         unsigned long flags = 0;
 719
 720
 721 dbg( "digi_write_inb_command: TOP: port=%d, count=%d", priv->dp_port_num,
 722 count );
 723
 724         if( timeout )
 725                 timeout += jiffies;
 726         else
 727                 timeout = ULONG_MAX;
 728
 729         spin_lock_irqsave( &priv->dp_port_lock, flags );
 730
 731         while( count > 0 && ret == 0 ) {
 732
 733                 while( (port->write_urb->status == -EINPROGRESS
 734                 || priv->dp_write_urb_in_use) && time_before(jiffies, timeout)) {
 735                         cond_wait_interruptible_timeout_irqrestore(
 736                                 &port->write_wait, DIGI_RETRY_TIMEOUT,
 737                                 &priv->dp_port_lock, flags );
 738                         if( signal_pending(current) ) {
 739                                 return( -EINTR );
 740                         }
 741                         spin_lock_irqsave( &priv->dp_port_lock, flags );
 742                 }
 743
 744                 /* len must be a multiple of 4 and small enough to */
 745                 /* guarantee the write will send buffered data first, */
 746                 /* so commands are in order with data and not split */
 747                 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len );
 748                 if( len > 4 )
 749                         len &= ~3;
 750
 751                 /* write any buffered data first */
 752                 if( priv->dp_out_buf_len > 0 ) {
 753                         data[0] = DIGI_CMD_SEND_DATA;
 754                         data[1] = priv->dp_out_buf_len;
 755                         memcpy( data+2, priv->dp_out_buf,
 756                                 priv->dp_out_buf_len );
 757                         memcpy( data+2+priv->dp_out_buf_len, buf, len );
 758                         port->write_urb->transfer_buffer_length
 759                                 = priv->dp_out_buf_len+2+len;
 760                 } else {
 761                         memcpy( data, buf, len );
 762                         port->write_urb->transfer_buffer_length = len;
 763                 }
 764                 port->write_urb->dev = port->serial->dev;
 765
 766                 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) {
 767                         priv->dp_write_urb_in_use = 1;
 768                         priv->dp_out_buf_len = 0;
 769                         count -= len;
 770                         buf += len;
 771                 }
 772
 773         }
 774
 775         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
 776
 777         if( ret ) {
 778                 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
 779                 ret, priv->dp_port_num );
 780         }
 781
 782         return( ret );
 783
 784 }
 785
 786
 787 /*
 788 *  Digi Set Modem Signals
 789 *
 790 *  Sets or clears DTR and RTS on the port, according to the
 791 *  modem_signals argument.  Use TIOCM_DTR and TIOCM_RTS flags
 792 *  for the modem_signals argument.  Returns 0 if successful,
 793 *  -EINTR if interrupted while sleeping, or a non-zero error
 794 *  returned by usb_submit_urb.
 795 */
 796
 797 static int digi_set_modem_signals( struct usb_serial_port *port,
 798         unsigned int modem_signals, int interruptible )
 799 {
 800
 801         int ret;
 802         struct digi_port *port_priv = usb_get_serial_port_data(port);
 803         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 804         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 805         unsigned char *data = oob_port->write_urb->transfer_buffer;
 806         unsigned long flags = 0;
 807
 808
 809 dbg( "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
 810 port_priv->dp_port_num, modem_signals );
 811
 812         spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
 813         spin_lock( &port_priv->dp_port_lock );
 814
 815         while( oob_port->write_urb->status == -EINPROGRESS
 816         || oob_priv->dp_write_urb_in_use ) {
 817                 spin_unlock( &port_priv->dp_port_lock );
 818                 cond_wait_interruptible_timeout_irqrestore(
 819                         &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
 820                         &oob_priv->dp_port_lock, flags );
 821                 if( interruptible && signal_pending(current) ) {
 822                         return( -EINTR );
 823                 }
 824                 spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
 825                 spin_lock( &port_priv->dp_port_lock );
 826         }
 827
 828         data[0] = DIGI_CMD_SET_DTR_SIGNAL;
 829         data[1] = port_priv->dp_port_num;
 830         data[2] = (modem_signals&TIOCM_DTR) ?
 831                 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
 832         data[3] = 0;
 833
 834         data[4] = DIGI_CMD_SET_RTS_SIGNAL;
 835         data[5] = port_priv->dp_port_num;
 836         data[6] = (modem_signals&TIOCM_RTS) ?
 837                 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
 838         data[7] = 0;
 839
 840         oob_port->write_urb->transfer_buffer_length = 8;
 841         oob_port->write_urb->dev = port->serial->dev;
 842
 843         if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) {
 844                 oob_priv->dp_write_urb_in_use = 1;
 845                 port_priv->dp_modem_signals =
 846                         (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
 847                         | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
 848         }
 849
 850         spin_unlock( &port_priv->dp_port_lock );
 851         spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags );
 852
 853         if( ret ) {
 854                 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__,
 855                 ret );
 856         }
 857
 858         return( ret );
 859
 860 }
 861
 862
 863 /*
 864 *  Digi Transmit Idle
 865 *
 866 *  Digi transmit idle waits, up to timeout ticks, for the transmitter
 867 *  to go idle.  It returns 0 if successful or a negative error.
 868 *
 869 *  There are race conditions here if more than one process is calling
 870 *  digi_transmit_idle on the same port at the same time.  However, this
 871 *  is only called from close, and only one process can be in close on a
 872 *  port at a time, so its ok.
 873 */
 874
 875 static int digi_transmit_idle( struct usb_serial_port *port,
 876         unsigned long timeout )
 877 {
 878
 879         int ret;
 880         unsigned char buf[2];
 881         struct digi_port *priv = usb_get_serial_port_data(port);
 882         unsigned long flags = 0;
 883
 884
 885         spin_lock_irqsave( &priv->dp_port_lock, flags );
 886         priv->dp_transmit_idle = 0;
 887         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
 888
 889         buf[0] = DIGI_CMD_TRANSMIT_IDLE;
 890         buf[1] = 0;
 891
 892         timeout += jiffies;
 893
 894         if( (ret=digi_write_inb_command( port, buf, 2, timeout-jiffies )) != 0 )
 895                 return( ret );
 896
 897         spin_lock_irqsave( &priv->dp_port_lock, flags );
 898
 899         while( time_before(jiffies, timeout) && !priv->dp_transmit_idle ) {
 900                 cond_wait_interruptible_timeout_irqrestore(
 901                         &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
 902                         &priv->dp_port_lock, flags );
 903                 if( signal_pending(current) ) {
 904                         return( -EINTR );
 905                 }
 906                 spin_lock_irqsave( &priv->dp_port_lock, flags );
 907         }
 908
 909         priv->dp_transmit_idle = 0;
 910         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
 911
 912         return( 0 );
 913
 914 }
 915
 916
 917 static void digi_rx_throttle( struct usb_serial_port *port )
 918 {
 919
 920         unsigned long flags;
 921         struct digi_port *priv = usb_get_serial_port_data(port);
 922
 923
 924 dbg( "digi_rx_throttle: TOP: port=%d", priv->dp_port_num );
 925
 926         /* stop receiving characters by not resubmitting the read urb */
 927         spin_lock_irqsave( &priv->dp_port_lock, flags );
 928         priv->dp_throttled = 1;
 929         priv->dp_throttle_restart = 0;
 930         priv->dp_in_buf_len = 0;
 931         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
 932
 933 }
 934
 935
 936 static void digi_rx_unthrottle( struct usb_serial_port *port )
 937 {
 938
 939         int ret = 0;
 940         int len;
 941         unsigned long flags;
 942         struct digi_port *priv = usb_get_serial_port_data(port);
 943         struct tty_struct *tty = port->tty;
 944
 945
 946 dbg( "digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num );
 947
 948         spin_lock_irqsave( &priv->dp_port_lock, flags );
 949
 950         /* send any buffered chars from throttle time on to tty subsystem */
 951         len = min(priv->dp_in_buf_len, TTY_FLIPBUF_SIZE - tty->flip.count );
 952         if( len > 0 ) {
 953                 memcpy( tty->flip.char_buf_ptr, priv->dp_in_buf, len );
 954                 memcpy( tty->flip.flag_buf_ptr, priv->dp_in_flag_buf, len );
 955                 tty->flip.char_buf_ptr += len;
 956                 tty->flip.flag_buf_ptr += len;
 957                 tty->flip.count += len;
 958                 tty_flip_buffer_push( tty );
 959         }
 960
 961         /* restart read chain */
 962         if( priv->dp_throttle_restart ) {
 963                 port->read_urb->dev = port->serial->dev;
 964                 ret = usb_submit_urb( port->read_urb, GFP_ATOMIC );
 965         }
 966
 967         /* turn throttle off */
 968         priv->dp_throttled = 0;
 969         priv->dp_in_buf_len = 0;
 970         priv->dp_throttle_restart = 0;
 971
 972         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
 973
 974         if( ret ) {
 975                 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
 976                         ret, priv->dp_port_num );
 977         }
 978
 979 }
 980
 981
 982 static void digi_set_termios( struct usb_serial_port *port,
 983         struct termios *old_termios )
 984 {
 985
 986         struct digi_port *priv = usb_get_serial_port_data(port);
 987         unsigned int iflag = port->tty->termios->c_iflag;
 988         unsigned int cflag = port->tty->termios->c_cflag;
 989         unsigned int old_iflag = old_termios->c_iflag;
 990         unsigned int old_cflag = old_termios->c_cflag;
 991         unsigned char buf[32];
 992         unsigned int modem_signals;
 993         int arg,ret;
 994         int i = 0;
 995
 996
 997 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 );
 998
 999         /* set baud rate */
1000         if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
1001
1002                 arg = -1;
1003
1004                 /* reassert DTR and (maybe) RTS on transition from B0 */
1005                 if( (old_cflag&CBAUD) == B0 ) {
1006                         /* don't set RTS if using hardware flow control */
1007                         /* and throttling input */
1008                         modem_signals = TIOCM_DTR;
1009                         if( !(port->tty->termios->c_cflag & CRTSCTS) ||
1010                         !test_bit(TTY_THROTTLED, &port->tty->flags) ) {
1011                                 modem_signals |= TIOCM_RTS;
1012                         }
1013                         digi_set_modem_signals( port, modem_signals, 1 );
1014                 }
1015
1016                 switch( (cflag&CBAUD) ) {
1017                         /* drop DTR and RTS on transition to B0 */
1018                 case B0: digi_set_modem_signals( port, 0, 1 ); break;
1019                 case B50: arg = DIGI_BAUD_50; break;
1020                 case B75: arg = DIGI_BAUD_75; break;
1021                 case B110: arg = DIGI_BAUD_110; break;
1022                 case B150: arg = DIGI_BAUD_150; break;
1023                 case B200: arg = DIGI_BAUD_200; break;
1024                 case B300: arg = DIGI_BAUD_300; break;
1025                 case B600: arg = DIGI_BAUD_600; break;
1026                 case B1200: arg = DIGI_BAUD_1200; break;
1027                 case B1800: arg = DIGI_BAUD_1800; break;
1028                 case B2400: arg = DIGI_BAUD_2400; break;
1029                 case B4800: arg = DIGI_BAUD_4800; break;
1030                 case B9600: arg = DIGI_BAUD_9600; break;
1031                 case B19200: arg = DIGI_BAUD_19200; break;
1032                 case B38400: arg = DIGI_BAUD_38400; break;
1033                 case B57600: arg = DIGI_BAUD_57600; break;
1034                 case B115200: arg = DIGI_BAUD_115200; break;
1035                 case B230400: arg = DIGI_BAUD_230400; break;
1036                 case B460800: arg = DIGI_BAUD_460800; break;
1037                 default:
1038                         dbg( "digi_set_termios: can't handle baud rate 0x%x",
1039                                 (cflag&CBAUD) );
1040                         break;
1041                 }
1042
1043                 if( arg != -1 ) {
1044                         buf[i++] = DIGI_CMD_SET_BAUD_RATE;
1045                         buf[i++] = priv->dp_port_num;
1046                         buf[i++] = arg;
1047                         buf[i++] = 0;
1048                 }
1049
1050         }
1051
1052         /* set parity */
1053         if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {
1054
1055                 if( (cflag&PARENB) ) {
1056                         if( (cflag&PARODD) )
1057                                 arg = DIGI_PARITY_ODD;
1058                         else
1059                                 arg = DIGI_PARITY_EVEN;
1060                 } else {
1061                         arg = DIGI_PARITY_NONE;
1062                 }
1063
1064                 buf[i++] = DIGI_CMD_SET_PARITY;
1065                 buf[i++] = priv->dp_port_num;
1066                 buf[i++] = arg;
1067                 buf[i++] = 0;
1068
1069         }
1070
1071         /* set word size */
1072         if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {
1073
1074                 arg = -1;
1075
1076                 switch( (cflag&CSIZE) ) {
1077                 case CS5: arg = DIGI_WORD_SIZE_5; break;
1078                 case CS6: arg = DIGI_WORD_SIZE_6; break;
1079                 case CS7: arg = DIGI_WORD_SIZE_7; break;
1080                 case CS8: arg = DIGI_WORD_SIZE_8; break;
1081                 default:
1082                         dbg( "digi_set_termios: can't handle word size %d",
1083                                 (cflag&CSIZE) );
1084                         break;
1085                 }
1086
1087                 if( arg != -1 ) {
1088                         buf[i++] = DIGI_CMD_SET_WORD_SIZE;
1089                         buf[i++] = priv->dp_port_num;
1090                         buf[i++] = arg;
1091                         buf[i++] = 0;
1092                 }
1093
1094         }
1095
1096         /* set stop bits */
1097         if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {
1098
1099                 if( (cflag&CSTOPB) )
1100                         arg = DIGI_STOP_BITS_2;
1101                 else
1102                         arg = DIGI_STOP_BITS_1;
1103
1104                 buf[i++] = DIGI_CMD_SET_STOP_BITS;
1105                 buf[i++] = priv->dp_port_num;
1106                 buf[i++] = arg;
1107                 buf[i++] = 0;
1108
1109         }
1110
1111         /* set input flow control */
1112         if( (iflag&IXOFF) != (old_iflag&IXOFF)
1113         || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
1114
1115                 arg = 0;
1116
1117                 if( (iflag&IXOFF) )
1118                         arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1119                 else
1120                         arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1121
1122                 if( (cflag&CRTSCTS) ) {
1123
1124                         arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
1125
1126                         /* On USB-4 it is necessary to assert RTS prior */
1127                         /* to selecting RTS input flow control.  */
1128                         buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
1129                         buf[i++] = priv->dp_port_num;
1130                         buf[i++] = DIGI_RTS_ACTIVE;
1131                         buf[i++] = 0;
1132
1133                 } else {
1134                         arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
1135                 }
1136
1137                 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1138                 buf[i++] = priv->dp_port_num;
1139                 buf[i++] = arg;
1140                 buf[i++] = 0;
1141
1142         }
1143
1144         /* set output flow control */
1145         if( (iflag&IXON) != (old_iflag&IXON)
1146         || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
1147
1148                 arg = 0;
1149
1150                 if( (iflag&IXON) )
1151                         arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1152                 else
1153                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1154
1155                 if( (cflag&CRTSCTS) ) {
1156                         arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
1157                 } else {
1158                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
1159                         port->tty->hw_stopped = 0;
1160                 }
1161
1162                 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1163                 buf[i++] = priv->dp_port_num;
1164                 buf[i++] = arg;
1165                 buf[i++] = 0;
1166
1167         }
1168
1169         /* set receive enable/disable */
1170         if( (cflag&CREAD) != (old_cflag&CREAD) ) {
1171
1172                 if( (cflag&CREAD) )
1173                         arg = DIGI_ENABLE;
1174                 else
1175                         arg = DIGI_DISABLE;
1176
1177                 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
1178                 buf[i++] = priv->dp_port_num;
1179                 buf[i++] = arg;
1180                 buf[i++] = 0;
1181
1182         }
1183
1184         if( (ret=digi_write_oob_command( port, buf, i, 1 )) != 0 )
1185                 dbg( "digi_set_termios: write oob failed, ret=%d", ret );
1186
1187 }
1188
1189
1190 static void digi_break_ctl( struct usb_serial_port *port, int break_state )
1191 {
1192
1193         unsigned char buf[4];
1194
1195
1196         buf[0] = DIGI_CMD_BREAK_CONTROL;
1197         buf[1] = 2;                             /* length */
1198         buf[2] = break_state ? 1 : 0;
1199         buf[3] = 0;                             /* pad */
1200
1201         digi_write_inb_command( port, buf, 4, 0 );
1202
1203 }
1204
1205
1206 static int digi_tiocmget( struct usb_serial_port *port, struct file *file )
1207 {
1208         struct digi_port *priv = usb_get_serial_port_data(port);
1209         unsigned int val;
1210         unsigned long flags;
1211
1212         dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num);
1213
1214         spin_lock_irqsave( &priv->dp_port_lock, flags );
1215         val = priv->dp_modem_signals;
1216         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1217         return val;
1218 }
1219
1220
1221 static int digi_tiocmset( struct usb_serial_port *port, struct file *file,
1222         unsigned int set, unsigned int clear )
1223 {
1224         struct digi_port *priv = usb_get_serial_port_data(port);
1225         unsigned int val;
1226         unsigned long flags;
1227
1228         dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num);
1229
1230         spin_lock_irqsave( &priv->dp_port_lock, flags );
1231         val = (priv->dp_modem_signals & ~clear) | set;
1232         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1233         return digi_set_modem_signals( port, val, 1 );
1234 }
1235
1236
1237 static int digi_ioctl( struct usb_serial_port *port, struct file *file,
1238         unsigned int cmd, unsigned long arg )
1239 {
1240
1241         struct digi_port *priv = usb_get_serial_port_data(port);
1242
1243 dbg( "digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd );
1244
1245         switch (cmd) {
1246
1247         case TIOCMIWAIT:
1248                 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
1249                 /* TODO */
1250                 return( 0 );
1251
1252         case TIOCGICOUNT:
1253                 /* return count of modemline transitions */
1254                 /* TODO */
1255                 return 0;
1256
1257         }
1258
1259         return( -ENOIOCTLCMD );
1260
1261 }
1262
1263
1264 static int digi_write( struct usb_serial_port *port, const unsigned char *buf, int count )
1265 {
1266
1267         int ret,data_len,new_len;
1268         struct digi_port *priv = usb_get_serial_port_data(port);
1269         unsigned char *data = port->write_urb->transfer_buffer;
1270         unsigned long flags = 0;
1271
1272
1273 dbg( "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld",
1274 priv->dp_port_num, count, in_interrupt() );
1275
1276         /* copy user data (which can sleep) before getting spin lock */
1277         count = min( count, port->bulk_out_size-2 );
1278         count = min( 64, count);
1279
1280         /* be sure only one write proceeds at a time */
1281         /* there are races on the port private buffer */
1282         /* and races to check write_urb->status */
1283         spin_lock_irqsave( &priv->dp_port_lock, flags );
1284
1285         /* wait for urb status clear to submit another urb */
1286         if( port->write_urb->status == -EINPROGRESS
1287         || priv->dp_write_urb_in_use ) {
1288
1289                 /* buffer data if count is 1 (probably put_char) if possible */
1290                 if( count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE ) {
1291                         priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
1292                         new_len = 1;
1293                 } else {
1294                         new_len = 0;
1295                 }
1296
1297                 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1298
1299                 return( new_len );
1300
1301         }
1302
1303         /* allow space for any buffered data and for new data, up to */
1304         /* transfer buffer size - 2 (for command and length bytes) */
1305         new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
1306         data_len = new_len + priv->dp_out_buf_len;
1307
1308         if( data_len == 0 ) {
1309                 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1310                 return( 0 );
1311         }
1312
1313         port->write_urb->transfer_buffer_length = data_len+2;
1314         port->write_urb->dev = port->serial->dev;
1315
1316         *data++ = DIGI_CMD_SEND_DATA;
1317         *data++ = data_len;
1318
1319         /* copy in buffered data first */
1320         memcpy( data, priv->dp_out_buf, priv->dp_out_buf_len );
1321         data += priv->dp_out_buf_len;
1322
1323         /* copy in new data */
1324         memcpy( data, buf, new_len );
1325
1326         if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) {
1327                 priv->dp_write_urb_in_use = 1;
1328                 ret = new_len;
1329                 priv->dp_out_buf_len = 0;
1330         }
1331
1332         /* return length of new data written, or error */
1333         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1334         if( ret < 0 ) {
1335                 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
1336                         ret, priv->dp_port_num );
1337         }
1338
1339 dbg( "digi_write: returning %d", ret );
1340         return( ret );
1341
1342 }
1343
1344
1345 static void digi_write_bulk_callback( struct urb *urb, struct pt_regs *regs )
1346 {
1347
1348         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1349         struct usb_serial *serial;
1350         struct digi_port *priv;
1351         struct digi_serial *serial_priv;
1352         int ret = 0;
1353
1354
1355 dbg( "digi_write_bulk_callback: TOP, urb->status=%d", urb->status );
1356
1357         /* port and serial sanity check */
1358         if( port == NULL || (priv=usb_get_serial_port_data(port)) == NULL ) {
1359                 err("%s: port or port->private is NULL, status=%d", __FUNCTION__,
1360                         urb->status );
1361                 return;
1362         }
1363         serial = port->serial;
1364         if( serial == NULL || (serial_priv=usb_get_serial_data(serial)) == NULL ) {
1365                 err("%s: serial or serial->private is NULL, status=%d", __FUNCTION__, urb->status );
1366                 return;
1367         }
1368
1369         /* handle oob callback */
1370         if( priv->dp_port_num == serial_priv->ds_oob_port_num ) {
1371                 dbg( "digi_write_bulk_callback: oob callback" );
1372                 spin_lock( &priv->dp_port_lock );
1373                 priv->dp_write_urb_in_use = 0;
1374                 wake_up_interruptible( &port->write_wait );
1375                 spin_unlock( &priv->dp_port_lock );
1376                 return;
1377         }
1378
1379         /* try to send any buffered data on this port, if it is open */
1380         spin_lock( &priv->dp_port_lock );
1381         priv->dp_write_urb_in_use = 0;
1382         if( port->open_count && port->write_urb->status != -EINPROGRESS
1383         && priv->dp_out_buf_len > 0 ) {
1384
1385                 *((unsigned char *)(port->write_urb->transfer_buffer))
1386                         = (unsigned char)DIGI_CMD_SEND_DATA;
1387                 *((unsigned char *)(port->write_urb->transfer_buffer)+1)
1388                         = (unsigned char)priv->dp_out_buf_len;
1389
1390                 port->write_urb->transfer_buffer_length
1391                         = priv->dp_out_buf_len+2;
1392                 port->write_urb->dev = serial->dev;
1393
1394                 memcpy( port->write_urb->transfer_buffer+2, priv->dp_out_buf,
1395                         priv->dp_out_buf_len );
1396
1397                 if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) {
1398                         priv->dp_write_urb_in_use = 1;
1399                         priv->dp_out_buf_len = 0;
1400                 }
1401
1402         }
1403
1404         /* wake up processes sleeping on writes immediately */
1405         digi_wakeup_write( port );
1406
1407         /* also queue up a wakeup at scheduler time, in case we */
1408         /* lost the race in write_chan(). */
1409         schedule_work(&priv->dp_wakeup_work);
1410
1411         spin_unlock( &priv->dp_port_lock );
1412
1413         if( ret ) {
1414                 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
1415                         ret, priv->dp_port_num );
1416         }
1417
1418 }
1419
1420
1421 static int digi_write_room( struct usb_serial_port *port )
1422 {
1423
1424         int room;
1425         struct digi_port *priv = usb_get_serial_port_data(port);
1426         unsigned long flags = 0;
1427
1428
1429         spin_lock_irqsave( &priv->dp_port_lock, flags );
1430
1431         if( port->write_urb->status == -EINPROGRESS
1432         || priv->dp_write_urb_in_use )
1433                 room = 0;
1434         else
1435                 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1436
1437         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1438
1439 dbg( "digi_write_room: port=%d, room=%d", priv->dp_port_num, room );
1440         return( room );
1441
1442 }
1443
1444
1445 static int digi_chars_in_buffer( struct usb_serial_port *port )
1446 {
1447
1448         struct digi_port *priv = usb_get_serial_port_data(port);
1449
1450
1451         if( port->write_urb->status == -EINPROGRESS
1452         || priv->dp_write_urb_in_use ) {
1453 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, port->bulk_out_size - 2 );
1454                 /* return( port->bulk_out_size - 2 ); */
1455                 return( 256 );
1456         } else {
1457 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, priv->dp_out_buf_len );
1458                 return( priv->dp_out_buf_len );
1459         }
1460
1461 }
1462
1463
1464 static int digi_open( struct usb_serial_port *port, struct file *filp )
1465 {
1466
1467         int ret;
1468         unsigned char buf[32];
1469         struct digi_port *priv = usb_get_serial_port_data(port);
1470         struct termios not_termios;
1471         unsigned long flags = 0;
1472
1473
1474 dbg( "digi_open: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count );
1475
1476         /* be sure the device is started up */
1477         if( digi_startup_device( port->serial ) != 0 )
1478                 return( -ENXIO );
1479
1480         spin_lock_irqsave( &priv->dp_port_lock, flags );
1481
1482         /* don't wait on a close in progress for non-blocking opens */
1483         if( priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
1484                 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1485                 return( -EAGAIN );
1486         }
1487
1488         /* wait for a close in progress to finish */
1489         while( priv->dp_in_close ) {
1490                 cond_wait_interruptible_timeout_irqrestore(
1491                         &priv->dp_close_wait, DIGI_RETRY_TIMEOUT,
1492                         &priv->dp_port_lock, flags );
1493                 if( signal_pending(current) ) {
1494                         return( -EINTR );
1495                 }
1496                 spin_lock_irqsave( &priv->dp_port_lock, flags );
1497         }
1498
1499         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1500
1501         /* read modem signals automatically whenever they change */
1502         buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1503         buf[1] = priv->dp_port_num;
1504         buf[2] = DIGI_ENABLE;
1505         buf[3] = 0;
1506
1507         /* flush fifos */
1508         buf[4] = DIGI_CMD_IFLUSH_FIFO;
1509         buf[5] = priv->dp_port_num;
1510         buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1511         buf[7] = 0;
1512
1513         if( (ret=digi_write_oob_command( port, buf, 8, 1 )) != 0 )
1514                 dbg( "digi_open: write oob failed, ret=%d", ret );
1515
1516         /* set termios settings */
1517         not_termios.c_cflag = ~port->tty->termios->c_cflag;
1518         not_termios.c_iflag = ~port->tty->termios->c_iflag;
1519         digi_set_termios( port, &not_termios );
1520
1521         /* set DTR and RTS */
1522         digi_set_modem_signals( port, TIOCM_DTR|TIOCM_RTS, 1 );
1523
1524         return( 0 );
1525
1526 }
1527
1528
1529 static void digi_close( struct usb_serial_port *port, struct file *filp )
1530 {
1531
1532         int ret;
1533         unsigned char buf[32];
1534         struct tty_struct *tty = port->tty;
1535         struct digi_port *priv = usb_get_serial_port_data(port);
1536         unsigned long flags = 0;
1537
1538
1539 dbg( "digi_close: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count );
1540
1541
1542         /* if disconnected, just clear flags */
1543         if (!usb_get_intfdata(port->serial->interface))
1544                 goto exit;
1545
1546         /* do cleanup only after final close on this port */
1547         spin_lock_irqsave( &priv->dp_port_lock, flags );
1548         priv->dp_in_close = 1;
1549         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1550
1551         /* tell line discipline to process only XON/XOFF */
1552         tty->closing = 1;
1553
1554         /* wait for output to drain */
1555         if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
1556                 tty_wait_until_sent( tty, DIGI_CLOSE_TIMEOUT );
1557         }
1558
1559         /* flush driver and line discipline buffers */
1560         if( tty->driver->flush_buffer )
1561                 tty->driver->flush_buffer( tty );
1562         tty_ldisc_flush(tty);
1563
1564         if (port->serial->dev) {
1565                 /* wait for transmit idle */
1566                 if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
1567                         digi_transmit_idle( port, DIGI_CLOSE_TIMEOUT );
1568                 }
1569
1570                 /* drop DTR and RTS */
1571                 digi_set_modem_signals( port, 0, 0 );
1572
1573                 /* disable input flow control */
1574                 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1575                 buf[1] = priv->dp_port_num;
1576                 buf[2] = DIGI_DISABLE;
1577                 buf[3] = 0;
1578
1579                 /* disable output flow control */
1580                 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1581                 buf[5] = priv->dp_port_num;
1582                 buf[6] = DIGI_DISABLE;
1583                 buf[7] = 0;
1584
1585                 /* disable reading modem signals automatically */
1586                 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1587                 buf[9] = priv->dp_port_num;
1588                 buf[10] = DIGI_DISABLE;
1589                 buf[11] = 0;
1590
1591                 /* disable receive */
1592                 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1593                 buf[13] = priv->dp_port_num;
1594                 buf[14] = DIGI_DISABLE;
1595                 buf[15] = 0;
1596
1597                 /* flush fifos */
1598                 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1599                 buf[17] = priv->dp_port_num;
1600                 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1601                 buf[19] = 0;
1602
1603                 if( (ret=digi_write_oob_command( port, buf, 20, 0 )) != 0 )
1604                         dbg( "digi_close: write oob failed, ret=%d", ret );
1605
1606                 /* wait for final commands on oob port to complete */
1607                 interruptible_sleep_on_timeout( &priv->dp_flush_wait,
1608                         DIGI_CLOSE_TIMEOUT );
1609
1610                 /* shutdown any outstanding bulk writes */
1611                 usb_kill_urb(port->write_urb);
1612         }
1613
1614         tty->closing = 0;
1615
1616 exit:
1617         spin_lock_irqsave( &priv->dp_port_lock, flags );
1618         priv->dp_write_urb_in_use = 0;
1619         priv->dp_in_close = 0;
1620         wake_up_interruptible( &priv->dp_close_wait );
1621         spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1622
1623 dbg( "digi_close: done" );
1624 }
1625
1626
1627 /*
1628 *  Digi Startup Device
1629 *
1630 *  Starts reads on all ports.  Must be called AFTER startup, with
1631 *  urbs initialized.  Returns 0 if successful, non-zero error otherwise.
1632 */
1633
1634 static int digi_startup_device( struct usb_serial *serial )
1635 {
1636
1637         int i,ret = 0;
1638         struct digi_serial *serial_priv = usb_get_serial_data(serial);
1639         struct usb_serial_port *port;
1640
1641
1642         /* be sure this happens exactly once */
1643         spin_lock( &serial_priv->ds_serial_lock );
1644         if( serial_priv->ds_device_started ) {
1645                 spin_unlock( &serial_priv->ds_serial_lock );
1646                 return( 0 );
1647         }
1648         serial_priv->ds_device_started = 1;
1649         spin_unlock( &serial_priv->ds_serial_lock );
1650
1651         /* start reading from each bulk in endpoint for the device */
1652         /* set USB_DISABLE_SPD flag for write bulk urbs */
1653         for( i=0; i<serial->type->num_ports+1; i++ ) {
1654
1655                 port = serial->port[i];
1656
1657                 port->write_urb->dev = port->serial->dev;
1658
1659                 if( (ret=usb_submit_urb(port->read_urb, GFP_KERNEL)) != 0 ) {
1660                         err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
1661                         ret, i );
1662                         break;
1663                 }
1664
1665         }
1666
1667         return( ret );
1668
1669 }
1670
1671
1672 static int digi_startup( struct usb_serial *serial )
1673 {
1674
1675         int i;
1676         struct digi_port *priv;
1677         struct digi_serial *serial_priv;
1678
1679
1680 dbg( "digi_startup: TOP" );
1681
1682         /* allocate the private data structures for all ports */
1683         /* number of regular ports + 1 for the out-of-band port */
1684         for( i=0; i<serial->type->num_ports+1; i++ ) {
1685
1686                 /* allocate port private structure */
1687                 priv = (struct digi_port *)kmalloc( sizeof(struct digi_port),
1688                         GFP_KERNEL );
1689                 if( priv == (struct digi_port *)0 ) {
1690                         while( --i >= 0 )
1691                                 kfree( usb_get_serial_port_data(serial->port[i]) );
1692                         return( 1 );                    /* error */
1693                 }
1694
1695                 /* initialize port private structure */
1696                 spin_lock_init( &priv->dp_port_lock );
1697                 priv->dp_port_num = i;
1698                 priv->dp_out_buf_len = 0;
1699                 priv->dp_in_buf_len = 0;
1700                 priv->dp_write_urb_in_use = 0;
1701                 priv->dp_modem_signals = 0;
1702                 init_waitqueue_head( &priv->dp_modem_change_wait );
1703                 priv->dp_transmit_idle = 0;
1704                 init_waitqueue_head( &priv->dp_transmit_idle_wait );
1705                 priv->dp_throttled = 0;
1706                 priv->dp_throttle_restart = 0;
1707                 init_waitqueue_head( &priv->dp_flush_wait );
1708                 priv->dp_in_close = 0;
1709                 init_waitqueue_head( &priv->dp_close_wait );
1710                 INIT_WORK(&priv->dp_wakeup_work,
1711                                 digi_wakeup_write_lock, serial->port[i]);
1712
1713                 /* initialize write wait queue for this port */
1714                 init_waitqueue_head( &serial->port[i]->write_wait );
1715
1716                 usb_set_serial_port_data(serial->port[i], priv);
1717         }
1718
1719         /* allocate serial private structure */
1720         serial_priv = (struct digi_serial *)kmalloc( sizeof(struct digi_serial),
1721                 GFP_KERNEL );
1722         if( serial_priv == (struct digi_serial *)0 ) {
1723                 for( i=0; i<serial->type->num_ports+1; i++ )
1724                         kfree( usb_get_serial_port_data(serial->port[i]) );
1725                 return( 1 );                    /* error */
1726         }
1727
1728         /* initialize serial private structure */
1729         spin_lock_init( &serial_priv->ds_serial_lock );
1730         serial_priv->ds_oob_port_num = serial->type->num_ports;
1731         serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1732         serial_priv->ds_device_started = 0;
1733         usb_set_serial_data(serial, serial_priv);
1734
1735         return( 0 );
1736
1737 }
1738
1739
1740 static void digi_shutdown( struct usb_serial *serial )
1741 {
1742
1743         int i;
1744
1745
1746 dbg( "digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt() );
1747
1748         /* stop reads and writes on all ports */
1749         for( i=0; i<serial->type->num_ports+1; i++ ) {
1750                 usb_kill_urb(serial->port[i]->read_urb);
1751                 usb_kill_urb(serial->port[i]->write_urb);
1752         }
1753
1754         /* free the private data structures for all ports */
1755         /* number of regular ports + 1 for the out-of-band port */
1756         for( i=0; i<serial->type->num_ports+1; i++ )
1757                 kfree( usb_get_serial_port_data(serial->port[i]) );
1758         kfree( usb_get_serial_data(serial) );
1759 }
1760
1761
1762 static void digi_read_bulk_callback( struct urb *urb, struct pt_regs *regs )
1763 {
1764
1765         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1766         struct digi_port *priv;
1767         struct digi_serial *serial_priv;
1768         int ret;
1769
1770
1771 dbg( "digi_read_bulk_callback: TOP" );
1772
1773         /* port sanity check, do not resubmit if port is not valid */
1774         if( port == NULL || (priv=usb_get_serial_port_data(port)) == NULL ) {
1775                 err("%s: port or port->private is NULL, status=%d", __FUNCTION__,
1776                         urb->status );
1777                 return;
1778         }
1779         if( port->serial == NULL
1780         || (serial_priv=usb_get_serial_data(port->serial)) == NULL ) {
1781                 err("%s: serial is bad or serial->private is NULL, status=%d", __FUNCTION__, urb->status );
1782                 return;
1783         }
1784
1785         /* do not resubmit urb if it has any status error */
1786         if( urb->status ) {
1787                 err("%s: nonzero read bulk status: status=%d, port=%d", __FUNCTION__, urb->status, priv->dp_port_num );
1788                 return;
1789         }
1790
1791         /* handle oob or inb callback, do not resubmit if error */
1792         if( priv->dp_port_num == serial_priv->ds_oob_port_num ) {
1793                 if( digi_read_oob_callback( urb ) != 0 )
1794                         return;
1795         } else {
1796                 if( digi_read_inb_callback( urb ) != 0 )
1797                         return;
1798         }
1799
1800         /* continue read */
1801         urb->dev = port->serial->dev;
1802         if( (ret=usb_submit_urb(urb, GFP_ATOMIC)) != 0 ) {
1803                 err("%s: failed resubmitting urb, ret=%d, port=%d", __FUNCTION__,
1804                         ret, priv->dp_port_num );
1805         }
1806
1807 }
1808
1809
1810 /*
1811 *  Digi Read INB Callback
1812 *
1813 *  Digi Read INB Callback handles reads on the in band ports, sending
1814 *  the data on to the tty subsystem.  When called we know port and
1815 *  port->private are not NULL and port->serial has been validated.
1816 *  It returns 0 if successful, 1 if successful but the port is
1817 *  throttled, and -1 if the sanity checks failed.
1818 */
1819
1820 static int digi_read_inb_callback( struct urb *urb )
1821 {
1822
1823         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1824         struct tty_struct *tty = port->tty;
1825         struct digi_port *priv = usb_get_serial_port_data(port);
1826         int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1827         int len = ((unsigned char *)urb->transfer_buffer)[1];
1828         int status = ((unsigned char *)urb->transfer_buffer)[2];
1829         unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3;
1830         int flag,throttled;
1831
1832         /* do not process callbacks on closed ports */
1833         /* but do continue the read chain */
1834         if( port->open_count == 0 )
1835                 return( 0 );
1836
1837         /* short/multiple packet check */
1838         if( urb->actual_length != len + 2 ) {
1839                 err("%s: INCOMPLETE OR MULTIPLE PACKET, urb->status=%d, port=%d, opcode=%d, len=%d, actual_length=%d, status=%d", __FUNCTION__, urb->status, priv->dp_port_num, opcode, len, urb->actual_length, status );
1840                 return( -1 );
1841         }
1842
1843         spin_lock( &priv->dp_port_lock );
1844
1845         /* check for throttle; if set, do not resubmit read urb */
1846         /* indicate the read chain needs to be restarted on unthrottle */
1847         throttled = priv->dp_throttled;
1848         if( throttled )
1849                 priv->dp_throttle_restart = 1;
1850
1851         /* receive data */
1852         if( opcode == DIGI_CMD_RECEIVE_DATA ) {
1853
1854                 /* get flag from status */
1855                 flag = 0;
1856
1857                 /* overrun is special, not associated with a char */
1858                 if( status & DIGI_OVERRUN_ERROR ) {
1859                         tty_insert_flip_char( tty, 0, TTY_OVERRUN );
1860                 }
1861
1862                 /* break takes precedence over parity, */
1863                 /* which takes precedence over framing errors */
1864                 if( status & DIGI_BREAK_ERROR ) {
1865                         flag = TTY_BREAK;
1866                 } else if( status & DIGI_PARITY_ERROR ) {
1867                         flag = TTY_PARITY;
1868                 } else if( status & DIGI_FRAMING_ERROR ) {
1869                         flag = TTY_FRAME;
1870                 }
1871
1872                 /* data length is len-1 (one byte of len is status) */
1873                 --len;
1874
1875                 if( throttled ) {
1876
1877                         len = min( len,
1878                                 DIGI_IN_BUF_SIZE - priv->dp_in_buf_len );
1879
1880                         if( len > 0 ) {
1881                                 memcpy( priv->dp_in_buf + priv->dp_in_buf_len,
1882                                         data, len );
1883                                 memset( priv->dp_in_flag_buf
1884                                         + priv->dp_in_buf_len, flag, len );
1885                                 priv->dp_in_buf_len += len;
1886                         }
1887
1888                 } else {
1889
1890                         len = min( len, TTY_FLIPBUF_SIZE - tty->flip.count );
1891
1892                         if( len > 0 ) {
1893                                 memcpy( tty->flip.char_buf_ptr, data, len );
1894                                 memset( tty->flip.flag_buf_ptr, flag, len );
1895                                 tty->flip.char_buf_ptr += len;
1896                                 tty->flip.flag_buf_ptr += len;
1897                                 tty->flip.count += len;
1898                                 tty_flip_buffer_push( tty );
1899                         }
1900
1901                 }
1902
1903         }
1904
1905         spin_unlock( &priv->dp_port_lock );
1906
1907         if( opcode == DIGI_CMD_RECEIVE_DISABLE ) {
1908                 dbg("%s: got RECEIVE_DISABLE", __FUNCTION__ );
1909         } else if( opcode != DIGI_CMD_RECEIVE_DATA ) {
1910                 dbg("%s: unknown opcode: %d", __FUNCTION__, opcode );
1911         }
1912
1913         return( throttled ? 1 : 0 );
1914
1915 }
1916
1917
1918 /*
1919 *  Digi Read OOB Callback
1920 *
1921 *  Digi Read OOB Callback handles reads on the out of band port.
1922 *  When called we know port and port->private are not NULL and
1923 *  the port->serial is valid.  It returns 0 if successful, and
1924 *  -1 if the sanity checks failed.
1925 */
1926
1927 static int digi_read_oob_callback( struct urb *urb )
1928 {
1929
1930         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1931         struct usb_serial *serial = port->serial;
1932         struct digi_port *priv = usb_get_serial_port_data(port);
1933         int opcode, line, status, val;
1934         int i;
1935
1936
1937 dbg( "digi_read_oob_callback: port=%d, len=%d", priv->dp_port_num,
1938 urb->actual_length );
1939
1940         /* handle each oob command */
1941         for( i=0; i<urb->actual_length-3; ) {
1942
1943                 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1944                 line = ((unsigned char *)urb->transfer_buffer)[i++];
1945                 status = ((unsigned char *)urb->transfer_buffer)[i++];
1946                 val = ((unsigned char *)urb->transfer_buffer)[i++];
1947
1948 dbg( "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1949 opcode, line, status, val );
1950
1951                 if( status != 0 || line >= serial->type->num_ports )
1952                         continue;
1953
1954                 port = serial->port[line];
1955
1956                 if ((priv=usb_get_serial_port_data(port)) == NULL )
1957                         return -1;
1958
1959                 if( opcode == DIGI_CMD_READ_INPUT_SIGNALS ) {
1960
1961                         spin_lock( &priv->dp_port_lock );
1962
1963                         /* convert from digi flags to termiox flags */
1964                         if( val & DIGI_READ_INPUT_SIGNALS_CTS ) {
1965                                 priv->dp_modem_signals |= TIOCM_CTS;
1966                                 /* port must be open to use tty struct */
1967                                 if( port->open_count
1968                                 && port->tty->termios->c_cflag & CRTSCTS ) {
1969                                         port->tty->hw_stopped = 0;
1970                                         digi_wakeup_write( port );
1971                                 }
1972                         } else {
1973                                 priv->dp_modem_signals &= ~TIOCM_CTS;
1974                                 /* port must be open to use tty struct */
1975                                 if( port->open_count
1976                                 && port->tty->termios->c_cflag & CRTSCTS ) {
1977                                         port->tty->hw_stopped = 1;
1978                                 }
1979                         }
1980                         if( val & DIGI_READ_INPUT_SIGNALS_DSR )
1981                                 priv->dp_modem_signals |= TIOCM_DSR;
1982                         else
1983                                 priv->dp_modem_signals &= ~TIOCM_DSR;
1984                         if( val & DIGI_READ_INPUT_SIGNALS_RI )
1985                                 priv->dp_modem_signals |= TIOCM_RI;
1986                         else
1987                                 priv->dp_modem_signals &= ~TIOCM_RI;
1988                         if( val & DIGI_READ_INPUT_SIGNALS_DCD )
1989                                 priv->dp_modem_signals |= TIOCM_CD;
1990                         else
1991                                 priv->dp_modem_signals &= ~TIOCM_CD;
1992
1993                         wake_up_interruptible( &priv->dp_modem_change_wait );
1994                         spin_unlock( &priv->dp_port_lock );
1995
1996                 } else if( opcode == DIGI_CMD_TRANSMIT_IDLE ) {
1997
1998                         spin_lock( &priv->dp_port_lock );
1999                         priv->dp_transmit_idle = 1;
2000                         wake_up_interruptible( &priv->dp_transmit_idle_wait );
2001                         spin_unlock( &priv->dp_port_lock );
2002
2003                 } else if( opcode == DIGI_CMD_IFLUSH_FIFO ) {
2004
2005                         wake_up_interruptible( &priv->dp_flush_wait );
2006
2007                 }
2008
2009         }
2010
2011         return( 0 );
2012
2013 }
2014
2015
2016 static int __init digi_init (void)
2017 {
2018         int retval;
2019         retval = usb_serial_register(&digi_acceleport_2_device);
2020         if (retval)
2021                 goto failed_acceleport_2_device;
2022         retval = usb_serial_register(&digi_acceleport_4_device);
2023         if (retval)
2024                 goto failed_acceleport_4_device;
2025         retval = usb_register(&digi_driver);
2026         if (retval)
2027                 goto failed_usb_register;
2028         info(DRIVER_VERSION ":" DRIVER_DESC);
2029         return 0;
2030 failed_usb_register:
2031         usb_serial_deregister(&digi_acceleport_4_device);
2032 failed_acceleport_4_device:
2033         usb_serial_deregister(&digi_acceleport_2_device);
2034 failed_acceleport_2_device:
2035         return retval;
2036 }
2037
2038
2039 static void __exit digi_exit (void)
2040 {
2041         usb_deregister (&digi_driver);
2042         usb_serial_deregister (&digi_acceleport_2_device);
2043         usb_serial_deregister (&digi_acceleport_4_device);
2044 }
2045
2046
2047 module_init(digi_init);
2048 module_exit(digi_exit);
2049
2050
2051 MODULE_AUTHOR( DRIVER_AUTHOR );
2052 MODULE_DESCRIPTION( DRIVER_DESC );
2053 MODULE_LICENSE("GPL");
2054
2055 module_param(debug, bool, S_IRUGO | S_IWUSR);
2056 MODULE_PARM_DESC(debug, "Debug enabled or not");