err.no Git - linux-2.6/blob - drivers/usb/serial/digi_acceleport.c

   1 /*
   2 *  Digi AccelePort USB-4 and USB-2 Serial Converters
   3 *
   4 *  Copyright 2000 by Digi International
   5 *
   6 *  This program is free software; you can redistribute it and/or modify
   7 *  it under the terms of the GNU General Public License as published by
   8 *  the Free Software Foundation; either version 2 of the License, or
   9 *  (at your option) any later version.
  10 *
  11 *  Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
  12 *  usb-serial driver.
  13 *
  14 *  Peter Berger (pberger@brimson.com)
  15 *  Al Borchers (borchers@steinerpoint.com)
  16 *
  17 * (12/03/2001) gkh
  18 *       switched to using port->port.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
 234 #include <linux/kernel.h>
 235 #include <linux/errno.h>
 236 #include <linux/init.h>
 237 #include <linux/slab.h>
 238 #include <linux/tty.h>
 239 #include <linux/tty_driver.h>
 240 #include <linux/tty_flip.h>
 241 #include <linux/module.h>
 242 #include <linux/spinlock.h>
 243 #include <linux/workqueue.h>
 244 #include <asm/uaccess.h>
 245 #include <linux/usb.h>
 246 #include <linux/wait.h>
 247 #include <linux/usb/serial.h>
 248
 249 /* Defines */
 250
 251 /*
 252  * Version Information
 253  */
 254 #define DRIVER_VERSION "v1.80.1.2"
 255 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
 256 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
 257
 258 /* port output buffer length -- must be <= transfer buffer length - 2 */
 259 /* so we can be sure to send the full buffer in one urb */
 260 #define DIGI_OUT_BUF_SIZE               8
 261
 262 /* port input buffer length -- must be >= transfer buffer length - 3 */
 263 /* so we can be sure to hold at least one full buffer from one urb */
 264 #define DIGI_IN_BUF_SIZE                64
 265
 266 /* retry timeout while sleeping */
 267 #define DIGI_RETRY_TIMEOUT              (HZ/10)
 268
 269 /* timeout while waiting for tty output to drain in close */
 270 /* this delay is used twice in close, so the total delay could */
 271 /* be twice this value */
 272 #define DIGI_CLOSE_TIMEOUT              (5*HZ)
 273
 274
 275 /* AccelePort USB Defines */
 276
 277 /* ids */
 278 #define DIGI_VENDOR_ID                  0x05c5
 279 #define DIGI_2_ID                       0x0002  /* USB-2 */
 280 #define DIGI_4_ID                       0x0004  /* USB-4 */
 281
 282 /* commands
 283  * "INB": can be used on the in-band endpoint
 284  * "OOB": can be used on the out-of-band endpoint
 285  */
 286 #define DIGI_CMD_SET_BAUD_RATE                  0       /* INB, OOB */
 287 #define DIGI_CMD_SET_WORD_SIZE                  1       /* INB, OOB */
 288 #define DIGI_CMD_SET_PARITY                     2       /* INB, OOB */
 289 #define DIGI_CMD_SET_STOP_BITS                  3       /* INB, OOB */
 290 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL         4       /* INB, OOB */
 291 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL        5       /* INB, OOB */
 292 #define DIGI_CMD_SET_DTR_SIGNAL                 6       /* INB, OOB */
 293 #define DIGI_CMD_SET_RTS_SIGNAL                 7       /* INB, OOB */
 294 #define DIGI_CMD_READ_INPUT_SIGNALS             8       /*      OOB */
 295 #define DIGI_CMD_IFLUSH_FIFO                    9       /*      OOB */
 296 #define DIGI_CMD_RECEIVE_ENABLE                 10      /* INB, OOB */
 297 #define DIGI_CMD_BREAK_CONTROL                  11      /* INB, OOB */
 298 #define DIGI_CMD_LOCAL_LOOPBACK                 12      /* INB, OOB */
 299 #define DIGI_CMD_TRANSMIT_IDLE                  13      /* INB, OOB */
 300 #define DIGI_CMD_READ_UART_REGISTER             14      /*      OOB */
 301 #define DIGI_CMD_WRITE_UART_REGISTER            15      /* INB, OOB */
 302 #define DIGI_CMD_AND_UART_REGISTER              16      /* INB, OOB */
 303 #define DIGI_CMD_OR_UART_REGISTER               17      /* INB, OOB */
 304 #define DIGI_CMD_SEND_DATA                      18      /* INB      */
 305 #define DIGI_CMD_RECEIVE_DATA                   19      /* INB      */
 306 #define DIGI_CMD_RECEIVE_DISABLE                20      /* INB      */
 307 #define DIGI_CMD_GET_PORT_TYPE                  21      /*      OOB */
 308
 309 /* baud rates */
 310 #define DIGI_BAUD_50                            0
 311 #define DIGI_BAUD_75                            1
 312 #define DIGI_BAUD_110                           2
 313 #define DIGI_BAUD_150                           3
 314 #define DIGI_BAUD_200                           4
 315 #define DIGI_BAUD_300                           5
 316 #define DIGI_BAUD_600                           6
 317 #define DIGI_BAUD_1200                          7
 318 #define DIGI_BAUD_1800                          8
 319 #define DIGI_BAUD_2400                          9
 320 #define DIGI_BAUD_4800                          10
 321 #define DIGI_BAUD_7200                          11
 322 #define DIGI_BAUD_9600                          12
 323 #define DIGI_BAUD_14400                         13
 324 #define DIGI_BAUD_19200                         14
 325 #define DIGI_BAUD_28800                         15
 326 #define DIGI_BAUD_38400                         16
 327 #define DIGI_BAUD_57600                         17
 328 #define DIGI_BAUD_76800                         18
 329 #define DIGI_BAUD_115200                        19
 330 #define DIGI_BAUD_153600                        20
 331 #define DIGI_BAUD_230400                        21
 332 #define DIGI_BAUD_460800                        22
 333
 334 /* arguments */
 335 #define DIGI_WORD_SIZE_5                        0
 336 #define DIGI_WORD_SIZE_6                        1
 337 #define DIGI_WORD_SIZE_7                        2
 338 #define DIGI_WORD_SIZE_8                        3
 339
 340 #define DIGI_PARITY_NONE                        0
 341 #define DIGI_PARITY_ODD                         1
 342 #define DIGI_PARITY_EVEN                        2
 343 #define DIGI_PARITY_MARK                        3
 344 #define DIGI_PARITY_SPACE                       4
 345
 346 #define DIGI_STOP_BITS_1                        0
 347 #define DIGI_STOP_BITS_2                        1
 348
 349 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF        1
 350 #define DIGI_INPUT_FLOW_CONTROL_RTS             2
 351 #define DIGI_INPUT_FLOW_CONTROL_DTR             4
 352
 353 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF       1
 354 #define DIGI_OUTPUT_FLOW_CONTROL_CTS            2
 355 #define DIGI_OUTPUT_FLOW_CONTROL_DSR            4
 356
 357 #define DIGI_DTR_INACTIVE                       0
 358 #define DIGI_DTR_ACTIVE                         1
 359 #define DIGI_DTR_INPUT_FLOW_CONTROL             2
 360
 361 #define DIGI_RTS_INACTIVE                       0
 362 #define DIGI_RTS_ACTIVE                         1
 363 #define DIGI_RTS_INPUT_FLOW_CONTROL             2
 364 #define DIGI_RTS_TOGGLE                         3
 365
 366 #define DIGI_FLUSH_TX                           1
 367 #define DIGI_FLUSH_RX                           2
 368 #define DIGI_RESUME_TX                          4 /* clears xoff condition */
 369
 370 #define DIGI_TRANSMIT_NOT_IDLE                  0
 371 #define DIGI_TRANSMIT_IDLE                      1
 372
 373 #define DIGI_DISABLE                            0
 374 #define DIGI_ENABLE                             1
 375
 376 #define DIGI_DEASSERT                           0
 377 #define DIGI_ASSERT                             1
 378
 379 /* in band status codes */
 380 #define DIGI_OVERRUN_ERROR                      4
 381 #define DIGI_PARITY_ERROR                       8
 382 #define DIGI_FRAMING_ERROR                      16
 383 #define DIGI_BREAK_ERROR                        32
 384
 385 /* out of band status */
 386 #define DIGI_NO_ERROR                           0
 387 #define DIGI_BAD_FIRST_PARAMETER                1
 388 #define DIGI_BAD_SECOND_PARAMETER               2
 389 #define DIGI_INVALID_LINE                       3
 390 #define DIGI_INVALID_OPCODE                     4
 391
 392 /* input signals */
 393 #define DIGI_READ_INPUT_SIGNALS_SLOT            1
 394 #define DIGI_READ_INPUT_SIGNALS_ERR             2
 395 #define DIGI_READ_INPUT_SIGNALS_BUSY            4
 396 #define DIGI_READ_INPUT_SIGNALS_PE              8
 397 #define DIGI_READ_INPUT_SIGNALS_CTS             16
 398 #define DIGI_READ_INPUT_SIGNALS_DSR             32
 399 #define DIGI_READ_INPUT_SIGNALS_RI              64
 400 #define DIGI_READ_INPUT_SIGNALS_DCD             128
 401
 402
 403 /* Structures */
 404
 405 struct digi_serial {
 406         spinlock_t ds_serial_lock;
 407         struct usb_serial_port *ds_oob_port;    /* out-of-band port */
 408         int ds_oob_port_num;                    /* index of out-of-band port */
 409         int ds_device_started;
 410 };
 411
 412 struct digi_port {
 413         spinlock_t dp_port_lock;
 414         int dp_port_num;
 415         int dp_out_buf_len;
 416         unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
 417         int dp_write_urb_in_use;
 418         unsigned int dp_modem_signals;
 419         wait_queue_head_t dp_modem_change_wait;
 420         int dp_transmit_idle;
 421         wait_queue_head_t dp_transmit_idle_wait;
 422         int dp_throttled;
 423         int dp_throttle_restart;
 424         wait_queue_head_t dp_flush_wait;
 425         int dp_in_close;                        /* close in progress */
 426         wait_queue_head_t dp_close_wait;        /* wait queue for close */
 427         struct work_struct dp_wakeup_work;
 428         struct usb_serial_port *dp_port;
 429 };
 430
 431
 432 /* Local Function Declarations */
 433
 434 static void digi_wakeup_write(struct usb_serial_port *port);
 435 static void digi_wakeup_write_lock(struct work_struct *work);
 436 static int digi_write_oob_command(struct usb_serial_port *port,
 437         unsigned char *buf, int count, int interruptible);
 438 static int digi_write_inb_command(struct usb_serial_port *port,
 439         unsigned char *buf, int count, unsigned long timeout);
 440 static int digi_set_modem_signals(struct usb_serial_port *port,
 441         unsigned int modem_signals, int interruptible);
 442 static int digi_transmit_idle(struct usb_serial_port *port,
 443         unsigned long timeout);
 444 static void digi_rx_throttle (struct tty_struct *tty);
 445 static void digi_rx_unthrottle (struct tty_struct *tty);
 446 static void digi_set_termios(struct tty_struct *tty,
 447                 struct usb_serial_port *port, struct ktermios *old_termios);
 448 static void digi_break_ctl(struct tty_struct *tty, int break_state);
 449 static int digi_tiocmget(struct tty_struct *tty, struct file *file);
 450 static int digi_tiocmset(struct tty_struct *tty, struct file *file,
 451         unsigned int set, unsigned int clear);
 452 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
 453         const unsigned char *buf, int count);
 454 static void digi_write_bulk_callback(struct urb *urb);
 455 static int digi_write_room(struct tty_struct *tty);
 456 static int digi_chars_in_buffer(struct tty_struct *tty);
 457 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port,
 458         struct file *filp);
 459 static void digi_close(struct tty_struct *tty, struct usb_serial_port *port,
 460         struct file *filp);
 461 static int digi_startup_device(struct usb_serial *serial);
 462 static int digi_startup(struct usb_serial *serial);
 463 static void digi_shutdown(struct usb_serial *serial);
 464 static void digi_read_bulk_callback(struct urb *urb);
 465 static int digi_read_inb_callback(struct urb *urb);
 466 static int digi_read_oob_callback(struct urb *urb);
 467
 468
 469 /* Statics */
 470
 471 static int debug;
 472
 473 static struct usb_device_id id_table_combined [] = {
 474         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
 475         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
 476         { }                                             /* Terminating entry */
 477 };
 478
 479 static struct usb_device_id id_table_2 [] = {
 480         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
 481         { }                                             /* Terminating entry */
 482 };
 483
 484 static struct usb_device_id id_table_4 [] = {
 485         { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
 486         { }                                             /* Terminating entry */
 487 };
 488
 489 MODULE_DEVICE_TABLE (usb, id_table_combined);
 490
 491 static struct usb_driver digi_driver = {
 492         .name =         "digi_acceleport",
 493         .probe =        usb_serial_probe,
 494         .disconnect =   usb_serial_disconnect,
 495         .id_table =     id_table_combined,
 496         .no_dynamic_id =        1,
 497 };
 498
 499
 500 /* device info needed for the Digi serial converter */
 501
 502 static struct usb_serial_driver digi_acceleport_2_device = {
 503         .driver = {
 504                 .owner =                THIS_MODULE,
 505                 .name =                 "digi_2",
 506         },
 507         .description =                  "Digi 2 port USB adapter",
 508         .usb_driver =                   &digi_driver,
 509         .id_table =                     id_table_2,
 510         .num_ports =                    3,
 511         .open =                         digi_open,
 512         .close =                        digi_close,
 513         .write =                        digi_write,
 514         .write_room =                   digi_write_room,
 515         .write_bulk_callback =          digi_write_bulk_callback,
 516         .read_bulk_callback =           digi_read_bulk_callback,
 517         .chars_in_buffer =              digi_chars_in_buffer,
 518         .throttle =                     digi_rx_throttle,
 519         .unthrottle =                   digi_rx_unthrottle,
 520         .set_termios =                  digi_set_termios,
 521         .break_ctl =                    digi_break_ctl,
 522         .tiocmget =                     digi_tiocmget,
 523         .tiocmset =                     digi_tiocmset,
 524         .attach =                       digi_startup,
 525         .shutdown =                     digi_shutdown,
 526 };
 527
 528 static struct usb_serial_driver digi_acceleport_4_device = {
 529         .driver = {
 530                 .owner =                THIS_MODULE,
 531                 .name =                 "digi_4",
 532         },
 533         .description =                  "Digi 4 port USB adapter",
 534         .usb_driver =                   &digi_driver,
 535         .id_table =                     id_table_4,
 536         .num_ports =                    4,
 537         .open =                         digi_open,
 538         .close =                        digi_close,
 539         .write =                        digi_write,
 540         .write_room =                   digi_write_room,
 541         .write_bulk_callback =          digi_write_bulk_callback,
 542         .read_bulk_callback =           digi_read_bulk_callback,
 543         .chars_in_buffer =              digi_chars_in_buffer,
 544         .throttle =                     digi_rx_throttle,
 545         .unthrottle =                   digi_rx_unthrottle,
 546         .set_termios =                  digi_set_termios,
 547         .break_ctl =                    digi_break_ctl,
 548         .tiocmget =                     digi_tiocmget,
 549         .tiocmset =                     digi_tiocmset,
 550         .attach =                       digi_startup,
 551         .shutdown =                     digi_shutdown,
 552 };
 553
 554
 555 /* Functions */
 556
 557 /*
 558 *  Cond Wait Interruptible Timeout Irqrestore
 559 *
 560 *  Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
 561 *  so that wake ups are not lost if they occur between the unlock
 562 *  and the sleep.  In other words, spin_unlock_irqrestore and
 563 *  interruptible_sleep_on_timeout are "atomic" with respect to
 564 *  wake ups.  This is used to implement condition variables.
 565 *
 566 *  interruptible_sleep_on_timeout is deprecated and has been replaced
 567 *  with the equivalent code.
 568 */
 569
 570 static long cond_wait_interruptible_timeout_irqrestore(
 571         wait_queue_head_t *q, long timeout,
 572         spinlock_t *lock, unsigned long flags)
 573 __releases(lock)
 574 {
 575         DEFINE_WAIT(wait);
 576
 577         prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
 578         spin_unlock_irqrestore(lock, flags);
 579         timeout = schedule_timeout(timeout);
 580         finish_wait(q, &wait);
 581
 582         return timeout;
 583 }
 584
 585
 586 /*
 587 *  Digi Wakeup Write
 588 *
 589 *  Wake up port, line discipline, and tty processes sleeping
 590 *  on writes.
 591 */
 592
 593 static void digi_wakeup_write_lock(struct work_struct *work)
 594 {
 595         struct digi_port *priv = container_of(work, struct digi_port, dp_wakeup_work);
 596         struct usb_serial_port *port = priv->dp_port;
 597         unsigned long flags;
 598
 599         spin_lock_irqsave(&priv->dp_port_lock, flags);
 600         digi_wakeup_write(port);
 601         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 602 }
 603
 604 static void digi_wakeup_write(struct usb_serial_port *port)
 605 {
 606         tty_wakeup(port->port.tty);
 607 }
 608
 609
 610 /*
 611 *  Digi Write OOB Command
 612 *
 613 *  Write commands on the out of band port.  Commands are 4
 614 *  bytes each, multiple commands can be sent at once, and
 615 *  no command will be split across USB packets.  Returns 0
 616 *  if successful, -EINTR if interrupted while sleeping and
 617 *  the interruptible flag is true, or a negative error
 618 *  returned by usb_submit_urb.
 619 */
 620
 621 static int digi_write_oob_command(struct usb_serial_port *port,
 622         unsigned char *buf, int count, int interruptible)
 623 {
 624
 625         int ret = 0;
 626         int len;
 627         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 628         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 629         unsigned long flags = 0;
 630
 631         dbg("digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count);
 632
 633         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 634         while(count > 0) {
 635                 while(oob_port->write_urb->status == -EINPROGRESS
 636                         || oob_priv->dp_write_urb_in_use) {
 637                         cond_wait_interruptible_timeout_irqrestore(
 638                                 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
 639                                 &oob_priv->dp_port_lock, flags);
 640                         if (interruptible && signal_pending(current))
 641                                 return -EINTR;
 642                         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 643                 }
 644
 645                 /* len must be a multiple of 4, so commands are not split */
 646                 len = min(count, oob_port->bulk_out_size);
 647                 if (len > 4)
 648                         len &= ~3;
 649                 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
 650                 oob_port->write_urb->transfer_buffer_length = len;
 651                 oob_port->write_urb->dev = port->serial->dev;
 652                 if ((ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0) {
 653                         oob_priv->dp_write_urb_in_use = 1;
 654                         count -= len;
 655                         buf += len;
 656                 }
 657         }
 658         spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
 659         if (ret)
 660                 err("%s: usb_submit_urb failed, ret=%d", __func__, ret);
 661         return ret;
 662
 663 }
 664
 665
 666 /*
 667 *  Digi Write In Band Command
 668 *
 669 *  Write commands on the given port.  Commands are 4
 670 *  bytes each, multiple commands can be sent at once, and
 671 *  no command will be split across USB packets.  If timeout
 672 *  is non-zero, write in band command will return after
 673 *  waiting unsuccessfully for the URB status to clear for
 674 *  timeout ticks.  Returns 0 if successful, or a negative
 675 *  error returned by digi_write.
 676 */
 677
 678 static int digi_write_inb_command(struct usb_serial_port *port,
 679         unsigned char *buf, int count, unsigned long timeout)
 680 {
 681         int ret = 0;
 682         int len;
 683         struct digi_port *priv = usb_get_serial_port_data(port);
 684         unsigned char *data = port->write_urb->transfer_buffer;
 685         unsigned long flags = 0;
 686
 687         dbg("digi_write_inb_command: TOP: port=%d, count=%d",
 688                 priv->dp_port_num, count);
 689
 690         if (timeout)
 691                 timeout += jiffies;
 692         else
 693                 timeout = ULONG_MAX;
 694
 695         spin_lock_irqsave(&priv->dp_port_lock, flags);
 696         while(count > 0 && ret == 0) {
 697                 while((port->write_urb->status == -EINPROGRESS
 698                         || priv->dp_write_urb_in_use) && time_before(jiffies, timeout)) {
 699                         cond_wait_interruptible_timeout_irqrestore(
 700                                 &port->write_wait, DIGI_RETRY_TIMEOUT,
 701                                 &priv->dp_port_lock, flags);
 702                         if (signal_pending(current))
 703                                 return -EINTR;
 704                         spin_lock_irqsave(&priv->dp_port_lock, flags);
 705                 }
 706
 707                 /* len must be a multiple of 4 and small enough to */
 708                 /* guarantee the write will send buffered data first, */
 709                 /* so commands are in order with data and not split */
 710                 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
 711                 if (len > 4)
 712                         len &= ~3;
 713
 714                 /* write any buffered data first */
 715                 if (priv->dp_out_buf_len > 0) {
 716                         data[0] = DIGI_CMD_SEND_DATA;
 717                         data[1] = priv->dp_out_buf_len;
 718                         memcpy(data + 2, priv->dp_out_buf,
 719                                 priv->dp_out_buf_len);
 720                         memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
 721                         port->write_urb->transfer_buffer_length
 722                                 = priv->dp_out_buf_len + 2 + len;
 723                 } else {
 724                         memcpy(data, buf, len);
 725                         port->write_urb->transfer_buffer_length = len;
 726                 }
 727                 port->write_urb->dev = port->serial->dev;
 728
 729                 if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0) {
 730                         priv->dp_write_urb_in_use = 1;
 731                         priv->dp_out_buf_len = 0;
 732                         count -= len;
 733                         buf += len;
 734                 }
 735
 736         }
 737         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 738
 739         if (ret)
 740                 err("%s: usb_submit_urb failed, ret=%d, port=%d",
 741                         __func__, ret, priv->dp_port_num);
 742         return ret;
 743 }
 744
 745
 746 /*
 747 *  Digi Set Modem Signals
 748 *
 749 *  Sets or clears DTR and RTS on the port, according to the
 750 *  modem_signals argument.  Use TIOCM_DTR and TIOCM_RTS flags
 751 *  for the modem_signals argument.  Returns 0 if successful,
 752 *  -EINTR if interrupted while sleeping, or a non-zero error
 753 *  returned by usb_submit_urb.
 754 */
 755
 756 static int digi_set_modem_signals(struct usb_serial_port *port,
 757         unsigned int modem_signals, int interruptible)
 758 {
 759
 760         int ret;
 761         struct digi_port *port_priv = usb_get_serial_port_data(port);
 762         struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 763         struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 764         unsigned char *data = oob_port->write_urb->transfer_buffer;
 765         unsigned long flags = 0;
 766
 767
 768         dbg("digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
 769                 port_priv->dp_port_num, modem_signals);
 770
 771         spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 772         spin_lock(&port_priv->dp_port_lock);
 773
 774         while(oob_port->write_urb->status == -EINPROGRESS || oob_priv->dp_write_urb_in_use) {
 775                 spin_unlock(&port_priv->dp_port_lock);
 776                 cond_wait_interruptible_timeout_irqrestore(
 777                         &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
 778                         &oob_priv->dp_port_lock, flags);
 779                 if (interruptible && signal_pending(current))
 780                         return -EINTR;
 781                 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 782                 spin_lock(&port_priv->dp_port_lock);
 783         }
 784         data[0] = DIGI_CMD_SET_DTR_SIGNAL;
 785         data[1] = port_priv->dp_port_num;
 786         data[2] = (modem_signals&TIOCM_DTR) ? DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
 787         data[3] = 0;
 788         data[4] = DIGI_CMD_SET_RTS_SIGNAL;
 789         data[5] = port_priv->dp_port_num;
 790         data[6] = (modem_signals&TIOCM_RTS) ? DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
 791         data[7] = 0;
 792
 793         oob_port->write_urb->transfer_buffer_length = 8;
 794         oob_port->write_urb->dev = port->serial->dev;
 795
 796         if ((ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0) {
 797                 oob_priv->dp_write_urb_in_use = 1;
 798                 port_priv->dp_modem_signals =
 799                         (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
 800                         | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
 801         }
 802         spin_unlock(&port_priv->dp_port_lock);
 803         spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
 804         if (ret)
 805                 err("%s: usb_submit_urb failed, ret=%d", __func__, ret);
 806         return ret;
 807 }
 808
 809 /*
 810 *  Digi Transmit Idle
 811 *
 812 *  Digi transmit idle waits, up to timeout ticks, for the transmitter
 813 *  to go idle.  It returns 0 if successful or a negative error.
 814 *
 815 *  There are race conditions here if more than one process is calling
 816 *  digi_transmit_idle on the same port at the same time.  However, this
 817 *  is only called from close, and only one process can be in close on a
 818 *  port at a time, so its ok.
 819 */
 820
 821 static int digi_transmit_idle(struct usb_serial_port *port,
 822         unsigned long timeout)
 823 {
 824         int ret;
 825         unsigned char buf[2];
 826         struct digi_port *priv = usb_get_serial_port_data(port);
 827         unsigned long flags = 0;
 828
 829         spin_lock_irqsave(&priv->dp_port_lock, flags);
 830         priv->dp_transmit_idle = 0;
 831         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 832
 833         buf[0] = DIGI_CMD_TRANSMIT_IDLE;
 834         buf[1] = 0;
 835
 836         timeout += jiffies;
 837
 838         if ((ret = digi_write_inb_command(port, buf, 2, timeout - jiffies)) != 0)
 839                 return ret;
 840
 841         spin_lock_irqsave(&priv->dp_port_lock, flags);
 842
 843         while(time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
 844                 cond_wait_interruptible_timeout_irqrestore(
 845                         &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
 846                         &priv->dp_port_lock, flags);
 847                 if (signal_pending(current))
 848                         return -EINTR;
 849                 spin_lock_irqsave(&priv->dp_port_lock, flags);
 850         }
 851         priv->dp_transmit_idle = 0;
 852         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 853         return 0;
 854
 855 }
 856
 857
 858 static void digi_rx_throttle(struct tty_struct *tty)
 859 {
 860         unsigned long flags;
 861         struct usb_serial_port *port = tty->driver_data;
 862         struct digi_port *priv = usb_get_serial_port_data(port);
 863
 864
 865         dbg("digi_rx_throttle: TOP: port=%d", priv->dp_port_num);
 866
 867         /* stop receiving characters by not resubmitting the read urb */
 868         spin_lock_irqsave(&priv->dp_port_lock, flags);
 869         priv->dp_throttled = 1;
 870         priv->dp_throttle_restart = 0;
 871         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 872 }
 873
 874
 875 static void digi_rx_unthrottle(struct tty_struct *tty)
 876 {
 877         int ret = 0;
 878         unsigned long flags;
 879         struct usb_serial_port *port = tty->driver_data;
 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 tty_struct *tty,
 905                 struct usb_serial_port *port, struct ktermios *old_termios)
 906 {
 907         struct digi_port *priv = usb_get_serial_port_data(port);
 908         unsigned int iflag = tty->termios->c_iflag;
 909         unsigned int cflag = tty->termios->c_cflag;
 910         unsigned int old_iflag = old_termios->c_iflag;
 911         unsigned int old_cflag = old_termios->c_cflag;
 912         unsigned char buf[32];
 913         unsigned int modem_signals;
 914         int arg,ret;
 915         int i = 0;
 916         speed_t baud;
 917
 918         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);
 919
 920         /* set baud rate */
 921         if ((baud = tty_get_baud_rate(tty)) != tty_termios_baud_rate(old_termios)) {
 922                 arg = -1;
 923
 924                 /* reassert DTR and (maybe) RTS on transition from B0 */
 925                 if ((old_cflag&CBAUD) == B0) {
 926                         /* don't set RTS if using hardware flow control */
 927                         /* and throttling input */
 928                         modem_signals = TIOCM_DTR;
 929                         if (!(tty->termios->c_cflag & CRTSCTS) ||
 930                             !test_bit(TTY_THROTTLED, &tty->flags))
 931                                 modem_signals |= TIOCM_RTS;
 932                         digi_set_modem_signals(port, modem_signals, 1);
 933                 }
 934                 switch (baud) {
 935                         /* drop DTR and RTS on transition to B0 */
 936                         case 0: digi_set_modem_signals(port, 0, 1); break;
 937                         case 50: arg = DIGI_BAUD_50; break;
 938                         case 75: arg = DIGI_BAUD_75; break;
 939                         case 110: arg = DIGI_BAUD_110; break;
 940                         case 150: arg = DIGI_BAUD_150; break;
 941                         case 200: arg = DIGI_BAUD_200; break;
 942                         case 300: arg = DIGI_BAUD_300; break;
 943                         case 600: arg = DIGI_BAUD_600; break;
 944                         case 1200: arg = DIGI_BAUD_1200; break;
 945                         case 1800: arg = DIGI_BAUD_1800; break;
 946                         case 2400: arg = DIGI_BAUD_2400; break;
 947                         case 4800: arg = DIGI_BAUD_4800; break;
 948                         case 9600: arg = DIGI_BAUD_9600; break;
 949                         case 19200: arg = DIGI_BAUD_19200; break;
 950                         case 38400: arg = DIGI_BAUD_38400; break;
 951                         case 57600: arg = DIGI_BAUD_57600; break;
 952                         case 115200: arg = DIGI_BAUD_115200; break;
 953                         case 230400: arg = DIGI_BAUD_230400; break;
 954                         case 460800: arg = DIGI_BAUD_460800; break;
 955                         default:
 956                                 arg = DIGI_BAUD_9600;
 957                                 baud = 9600;
 958                                 break;
 959                 }
 960                 if (arg != -1) {
 961                         buf[i++] = DIGI_CMD_SET_BAUD_RATE;
 962                         buf[i++] = priv->dp_port_num;
 963                         buf[i++] = arg;
 964                         buf[i++] = 0;
 965                 }
 966         }
 967         /* set parity */
 968         tty->termios->c_cflag &= ~CMSPAR;
 969
 970         if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
 971                 if (cflag&PARENB) {
 972                         if (cflag&PARODD)
 973                                 arg = DIGI_PARITY_ODD;
 974                         else
 975                                 arg = DIGI_PARITY_EVEN;
 976                 } else {
 977                         arg = DIGI_PARITY_NONE;
 978                 }
 979                 buf[i++] = DIGI_CMD_SET_PARITY;
 980                 buf[i++] = priv->dp_port_num;
 981                 buf[i++] = arg;
 982                 buf[i++] = 0;
 983         }
 984         /* set word size */
 985         if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
 986                 arg = -1;
 987                 switch (cflag&CSIZE) {
 988                 case CS5: arg = DIGI_WORD_SIZE_5; break;
 989                 case CS6: arg = DIGI_WORD_SIZE_6; break;
 990                 case CS7: arg = DIGI_WORD_SIZE_7; break;
 991                 case CS8: arg = DIGI_WORD_SIZE_8; break;
 992                 default:
 993                         dbg("digi_set_termios: can't handle word size %d",
 994                                 (cflag&CSIZE));
 995                         break;
 996                 }
 997
 998                 if (arg != -1) {
 999                         buf[i++] = DIGI_CMD_SET_WORD_SIZE;
1000                         buf[i++] = priv->dp_port_num;
1001                         buf[i++] = arg;
1002                         buf[i++] = 0;
1003                 }
1004
1005         }
1006
1007         /* set stop bits */
1008         if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
1009
1010                 if ((cflag&CSTOPB))
1011                         arg = DIGI_STOP_BITS_2;
1012                 else
1013                         arg = DIGI_STOP_BITS_1;
1014
1015                 buf[i++] = DIGI_CMD_SET_STOP_BITS;
1016                 buf[i++] = priv->dp_port_num;
1017                 buf[i++] = arg;
1018                 buf[i++] = 0;
1019
1020         }
1021
1022         /* set input flow control */
1023         if ((iflag&IXOFF) != (old_iflag&IXOFF)
1024             || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
1025                 arg = 0;
1026                 if (iflag&IXOFF)
1027                         arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1028                 else
1029                         arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1030
1031                 if (cflag&CRTSCTS) {
1032                         arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
1033
1034                         /* On USB-4 it is necessary to assert RTS prior */
1035                         /* to selecting RTS input flow control.  */
1036                         buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
1037                         buf[i++] = priv->dp_port_num;
1038                         buf[i++] = DIGI_RTS_ACTIVE;
1039                         buf[i++] = 0;
1040
1041                 } else {
1042                         arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
1043                 }
1044                 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1045                 buf[i++] = priv->dp_port_num;
1046                 buf[i++] = arg;
1047                 buf[i++] = 0;
1048         }
1049
1050         /* set output flow control */
1051         if ((iflag & IXON) != (old_iflag & IXON)
1052             || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1053                 arg = 0;
1054                 if (iflag & IXON)
1055                         arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1056                 else
1057                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1058
1059                 if (cflag & CRTSCTS) {
1060                         arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
1061                 } else {
1062                         arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
1063                         tty->hw_stopped = 0;
1064                 }
1065
1066                 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1067                 buf[i++] = priv->dp_port_num;
1068                 buf[i++] = arg;
1069                 buf[i++] = 0;
1070         }
1071
1072         /* set receive enable/disable */
1073         if ((cflag & CREAD) != (old_cflag & CREAD)) {
1074                 if (cflag & CREAD)
1075                         arg = DIGI_ENABLE;
1076                 else
1077                         arg = DIGI_DISABLE;
1078
1079                 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
1080                 buf[i++] = priv->dp_port_num;
1081                 buf[i++] = arg;
1082                 buf[i++] = 0;
1083         }
1084         if ((ret = digi_write_oob_command(port, buf, i, 1)) != 0)
1085                 dbg("digi_set_termios: write oob failed, ret=%d", ret);
1086         tty_encode_baud_rate(tty, baud, baud);
1087 }
1088
1089
1090 static void digi_break_ctl(struct tty_struct *tty, int break_state)
1091 {
1092         struct usb_serial_port *port = tty->driver_data;
1093         unsigned char buf[4];
1094
1095         buf[0] = DIGI_CMD_BREAK_CONTROL;
1096         buf[1] = 2;                             /* length */
1097         buf[2] = break_state ? 1 : 0;
1098         buf[3] = 0;                             /* pad */
1099         digi_write_inb_command(port, buf, 4, 0);
1100 }
1101
1102
1103 static int digi_tiocmget(struct tty_struct *tty, struct file *file)
1104 {
1105         struct usb_serial_port *port = tty->driver_data;
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 tty_struct *tty, struct file *file,
1120         unsigned int set, unsigned int clear)
1121 {
1122         struct usb_serial_port *port = tty->driver_data;
1123         struct digi_port *priv = usb_get_serial_port_data(port);
1124         unsigned int val;
1125         unsigned long flags;
1126
1127         dbg("%s: TOP: port=%d", __func__, priv->dp_port_num);
1128
1129         spin_lock_irqsave(&priv->dp_port_lock, flags);
1130         val = (priv->dp_modem_signals & ~clear) | set;
1131         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1132         return digi_set_modem_signals(port, val, 1);
1133 }
1134
1135
1136 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
1137                                         const unsigned char *buf, int count)
1138 {
1139
1140         int ret,data_len,new_len;
1141         struct digi_port *priv = usb_get_serial_port_data(port);
1142         unsigned char *data = port->write_urb->transfer_buffer;
1143         unsigned long flags = 0;
1144
1145         dbg("digi_write: TOP: port=%d, count=%d, in_interrupt=%ld",
1146                 priv->dp_port_num, count, in_interrupt());
1147
1148         /* copy user data (which can sleep) before getting spin lock */
1149         count = min(count, port->bulk_out_size-2);
1150         count = min(64, count);
1151
1152         /* be sure only one write proceeds at a time */
1153         /* there are races on the port private buffer */
1154         /* and races to check write_urb->status */
1155         spin_lock_irqsave(&priv->dp_port_lock, flags);
1156
1157         /* wait for urb status clear to submit another urb */
1158         if (port->write_urb->status == -EINPROGRESS || priv->dp_write_urb_in_use) {
1159                 /* buffer data if count is 1 (probably put_char) if possible */
1160                 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
1161                         priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
1162                         new_len = 1;
1163                 } else {
1164                         new_len = 0;
1165                 }
1166                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1167                 return new_len;
1168         }
1169
1170         /* allow space for any buffered data and for new data, up to */
1171         /* transfer buffer size - 2 (for command and length bytes) */
1172         new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
1173         data_len = new_len + priv->dp_out_buf_len;
1174
1175         if (data_len == 0) {
1176                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1177                 return 0;
1178         }
1179
1180         port->write_urb->transfer_buffer_length = data_len+2;
1181         port->write_urb->dev = port->serial->dev;
1182
1183         *data++ = DIGI_CMD_SEND_DATA;
1184         *data++ = data_len;
1185
1186         /* copy in buffered data first */
1187         memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
1188         data += priv->dp_out_buf_len;
1189
1190         /* copy in new data */
1191         memcpy(data, buf, new_len);
1192
1193         if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0) {
1194                 priv->dp_write_urb_in_use = 1;
1195                 ret = new_len;
1196                 priv->dp_out_buf_len = 0;
1197         }
1198
1199         /* return length of new data written, or error */
1200         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1201         if (ret < 0)
1202                 err("%s: usb_submit_urb failed, ret=%d, port=%d",
1203                         __func__, ret, priv->dp_port_num);
1204         dbg("digi_write: returning %d", ret);
1205         return ret;
1206
1207 }
1208
1209 static void digi_write_bulk_callback(struct urb *urb)
1210 {
1211
1212         struct usb_serial_port *port = urb->context;
1213         struct usb_serial *serial;
1214         struct digi_port *priv;
1215         struct digi_serial *serial_priv;
1216         int ret = 0;
1217         int status = urb->status;
1218
1219         dbg("digi_write_bulk_callback: TOP, urb->status=%d", status);
1220
1221         /* port and serial sanity check */
1222         if (port == NULL || (priv=usb_get_serial_port_data(port)) == NULL) {
1223                 err("%s: port or port->private is NULL, status=%d",
1224                     __func__, status);
1225                 return;
1226         }
1227         serial = port->serial;
1228         if (serial == NULL || (serial_priv=usb_get_serial_data(serial)) == NULL) {
1229                 err("%s: serial or serial->private is NULL, status=%d",
1230                     __func__, status);
1231                 return;
1232         }
1233
1234         /* handle oob callback */
1235         if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1236                 dbg("digi_write_bulk_callback: oob callback");
1237                 spin_lock(&priv->dp_port_lock);
1238                 priv->dp_write_urb_in_use = 0;
1239                 wake_up_interruptible(&port->write_wait);
1240                 spin_unlock(&priv->dp_port_lock);
1241                 return;
1242         }
1243
1244         /* try to send any buffered data on this port, if it is open */
1245         spin_lock(&priv->dp_port_lock);
1246         priv->dp_write_urb_in_use = 0;
1247         if (port->port.count && port->write_urb->status != -EINPROGRESS
1248             && priv->dp_out_buf_len > 0) {
1249                 *((unsigned char *)(port->write_urb->transfer_buffer))
1250                         = (unsigned char)DIGI_CMD_SEND_DATA;
1251                 *((unsigned char *)(port->write_urb->transfer_buffer)+1)
1252                         = (unsigned char)priv->dp_out_buf_len;
1253                 port->write_urb->transfer_buffer_length = priv->dp_out_buf_len+2;
1254                 port->write_urb->dev = serial->dev;
1255                 memcpy(port->write_urb->transfer_buffer+2, priv->dp_out_buf,
1256                         priv->dp_out_buf_len);
1257                 if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0) {
1258                         priv->dp_write_urb_in_use = 1;
1259                         priv->dp_out_buf_len = 0;
1260                 }
1261         }
1262         /* wake up processes sleeping on writes immediately */
1263         digi_wakeup_write(port);
1264         /* also queue up a wakeup at scheduler time, in case we */
1265         /* lost the race in write_chan(). */
1266         schedule_work(&priv->dp_wakeup_work);
1267
1268         spin_unlock(&priv->dp_port_lock);
1269         if (ret)
1270                 err("%s: usb_submit_urb failed, ret=%d, port=%d",
1271                         __func__, ret, priv->dp_port_num);
1272 }
1273
1274 static int digi_write_room(struct tty_struct *tty)
1275 {
1276         struct usb_serial_port *port = tty->driver_data;
1277         struct digi_port *priv = usb_get_serial_port_data(port);
1278         int room;
1279         unsigned long flags = 0;
1280
1281         spin_lock_irqsave(&priv->dp_port_lock, flags);
1282
1283         if (port->write_urb->status == -EINPROGRESS || priv->dp_write_urb_in_use)
1284                 room = 0;
1285         else
1286                 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1287
1288         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1289         dbg("digi_write_room: port=%d, room=%d", priv->dp_port_num, room);
1290         return room;
1291
1292 }
1293
1294 static int digi_chars_in_buffer(struct tty_struct *tty)
1295 {
1296         struct usb_serial_port *port = tty->driver_data;
1297         struct digi_port *priv = usb_get_serial_port_data(port);
1298
1299         if (port->write_urb->status == -EINPROGRESS
1300             || priv->dp_write_urb_in_use) {
1301                 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1302                         priv->dp_port_num, port->bulk_out_size - 2);
1303                 /* return(port->bulk_out_size - 2); */
1304                 return 256;
1305         } else {
1306                 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1307                         priv->dp_port_num, priv->dp_out_buf_len);
1308                 return priv->dp_out_buf_len;
1309         }
1310
1311 }
1312
1313
1314 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port,
1315                                 struct file *filp)
1316 {
1317         int ret;
1318         unsigned char buf[32];
1319         struct digi_port *priv = usb_get_serial_port_data(port);
1320         struct ktermios not_termios;
1321         unsigned long flags = 0;
1322
1323         dbg("digi_open: TOP: port=%d, open_count=%d",
1324                 priv->dp_port_num, port->port.count);
1325
1326         /* be sure the device is started up */
1327         if (digi_startup_device(port->serial) != 0)
1328                 return -ENXIO;
1329
1330         spin_lock_irqsave(&priv->dp_port_lock, flags);
1331
1332         /* don't wait on a close in progress for non-blocking opens */
1333         if (priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) {
1334                 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1335                 return -EAGAIN;
1336         }
1337
1338         /* wait for a close in progress to finish */
1339         while(priv->dp_in_close) {
1340                 cond_wait_interruptible_timeout_irqrestore(
1341                         &priv->dp_close_wait, DIGI_RETRY_TIMEOUT,
1342                         &priv->dp_port_lock, flags);
1343                 if (signal_pending(current))
1344                         return -EINTR;
1345                 spin_lock_irqsave(&priv->dp_port_lock, flags);
1346         }
1347
1348         spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1349
1350         /* read modem signals automatically whenever they change */
1351         buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1352         buf[1] = priv->dp_port_num;
1353         buf[2] = DIGI_ENABLE;
1354         buf[3] = 0;
1355
1356         /* flush fifos */
1357         buf[4] = DIGI_CMD_IFLUSH_FIFO;
1358         buf[5] = priv->dp_port_num;
1359         buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1360         buf[7] = 0;
1361
1362         if ((ret = digi_write_oob_command(port, buf, 8, 1)) != 0)
1363                 dbg("digi_open: write oob failed, ret=%d", ret);
1364
1365         /* set termios settings */
1366         if (tty) {
1367                 not_termios.c_cflag = ~tty->termios->c_cflag;
1368                 not_termios.c_iflag = ~tty->termios->c_iflag;
1369                 digi_set_termios(tty, port, &not_termios);
1370         }
1371
1372         /* set DTR and RTS */
1373         digi_set_modem_signals(port, TIOCM_DTR|TIOCM_RTS, 1);
1374
1375         return 0;
1376 }
1377
1378
1379 static void digi_close(struct tty_struct *tty, struct usb_serial_port *port,
1380                                 struct file *filp)
1381 {
1382         DEFINE_WAIT(wait);
1383         int ret;
1384         unsigned char buf[32];
1385         struct digi_port *priv = usb_get_serial_port_data(port);
1386
1387         dbg("digi_close: TOP: port=%d, open_count=%d",
1388                 priv->dp_port_num, port->port.count);
1389
1390         mutex_lock(&port->serial->disc_mutex);
1391         /* if disconnected, just clear flags */
1392         if (port->serial->disconnected)
1393                 goto exit;
1394
1395         /* do cleanup only after final close on this port */
1396         spin_lock_irq(&priv->dp_port_lock);
1397         priv->dp_in_close = 1;
1398         spin_unlock_irq(&priv->dp_port_lock);
1399
1400         /* tell line discipline to process only XON/XOFF */
1401         tty->closing = 1;
1402
1403         /* wait for output to drain */
1404         if ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0)
1405                 tty_wait_until_sent(tty, DIGI_CLOSE_TIMEOUT);
1406
1407         /* flush driver and line discipline buffers */
1408         tty_driver_flush_buffer(tty);
1409         tty_ldisc_flush(tty);
1410
1411         if (port->serial->dev) {
1412                 /* wait for transmit idle */
1413                 if ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) {
1414                         digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1415                 }
1416                 /* drop DTR and RTS */
1417                 digi_set_modem_signals(port, 0, 0);
1418
1419                 /* disable input flow control */
1420                 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1421                 buf[1] = priv->dp_port_num;
1422                 buf[2] = DIGI_DISABLE;
1423                 buf[3] = 0;
1424
1425                 /* disable output flow control */
1426                 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1427                 buf[5] = priv->dp_port_num;
1428                 buf[6] = DIGI_DISABLE;
1429                 buf[7] = 0;
1430
1431                 /* disable reading modem signals automatically */
1432                 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1433                 buf[9] = priv->dp_port_num;
1434                 buf[10] = DIGI_DISABLE;
1435                 buf[11] = 0;
1436
1437                 /* disable receive */
1438                 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1439                 buf[13] = priv->dp_port_num;
1440                 buf[14] = DIGI_DISABLE;
1441                 buf[15] = 0;
1442
1443                 /* flush fifos */
1444                 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1445                 buf[17] = priv->dp_port_num;
1446                 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1447                 buf[19] = 0;
1448
1449                 if ((ret = digi_write_oob_command(port, buf, 20, 0)) != 0)
1450                         dbg("digi_close: write oob failed, ret=%d", ret);
1451
1452                 /* wait for final commands on oob port to complete */
1453                 prepare_to_wait(&priv->dp_flush_wait, &wait, TASK_INTERRUPTIBLE);
1454                 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1455                 finish_wait(&priv->dp_flush_wait, &wait);
1456
1457                 /* shutdown any outstanding bulk writes */
1458                 usb_kill_urb(port->write_urb);
1459         }
1460         tty->closing = 0;
1461 exit:
1462         spin_lock_irq(&priv->dp_port_lock);
1463         priv->dp_write_urb_in_use = 0;
1464         priv->dp_in_close = 0;
1465         wake_up_interruptible(&priv->dp_close_wait);
1466         spin_unlock_irq(&priv->dp_port_lock);
1467         mutex_unlock(&port->serial->disc_mutex);
1468         dbg("digi_close: done");
1469 }
1470
1471
1472 /*
1473 *  Digi Startup Device
1474 *
1475 *  Starts reads on all ports.  Must be called AFTER startup, with
1476 *  urbs initialized.  Returns 0 if successful, non-zero error otherwise.
1477 */
1478
1479 static int digi_startup_device(struct usb_serial *serial)
1480 {
1481         int i,ret = 0;
1482         struct digi_serial *serial_priv = usb_get_serial_data(serial);
1483         struct usb_serial_port *port;
1484
1485         /* be sure this happens exactly once */
1486         spin_lock(&serial_priv->ds_serial_lock);
1487         if (serial_priv->ds_device_started) {
1488                 spin_unlock(&serial_priv->ds_serial_lock);
1489                 return 0;
1490         }
1491         serial_priv->ds_device_started = 1;
1492         spin_unlock(&serial_priv->ds_serial_lock);
1493
1494         /* start reading from each bulk in endpoint for the device */
1495         /* set USB_DISABLE_SPD flag for write bulk urbs */
1496         for (i = 0; i < serial->type->num_ports + 1; i++) {
1497                 port = serial->port[i];
1498                 port->write_urb->dev = port->serial->dev;
1499                 if ((ret = usb_submit_urb(port->read_urb, GFP_KERNEL)) != 0) {
1500                         err("%s: usb_submit_urb failed, ret=%d, port=%d",
1501                                         __func__, ret, i);
1502                         break;
1503                 }
1504         }
1505         return ret;
1506 }
1507
1508
1509 static int digi_startup(struct usb_serial *serial)
1510 {
1511
1512         int i;
1513         struct digi_port *priv;
1514         struct digi_serial *serial_priv;
1515
1516         dbg("digi_startup: TOP");
1517
1518         /* allocate the private data structures for all ports */
1519         /* number of regular ports + 1 for the out-of-band port */
1520         for(i = 0; i < serial->type->num_ports + 1; i++) {
1521                 /* allocate port private structure */
1522                 priv = kmalloc(sizeof(struct digi_port), GFP_KERNEL);
1523                 if (priv == NULL) {
1524                         while (--i >= 0)
1525                                 kfree(usb_get_serial_port_data(serial->port[i]));
1526                         return 1;                       /* error */
1527                 }
1528
1529                 /* initialize port private structure */
1530                 spin_lock_init(&priv->dp_port_lock);
1531                 priv->dp_port_num = i;
1532                 priv->dp_out_buf_len = 0;
1533                 priv->dp_write_urb_in_use = 0;
1534                 priv->dp_modem_signals = 0;
1535                 init_waitqueue_head(&priv->dp_modem_change_wait);
1536                 priv->dp_transmit_idle = 0;
1537                 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1538                 priv->dp_throttled = 0;
1539                 priv->dp_throttle_restart = 0;
1540                 init_waitqueue_head(&priv->dp_flush_wait);
1541                 priv->dp_in_close = 0;
1542                 init_waitqueue_head(&priv->dp_close_wait);
1543                 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1544                 priv->dp_port = serial->port[i];
1545                 /* initialize write wait queue for this port */
1546                 init_waitqueue_head(&serial->port[i]->write_wait);
1547
1548                 usb_set_serial_port_data(serial->port[i], priv);
1549         }
1550
1551         /* allocate serial private structure */
1552         serial_priv = kmalloc(sizeof(struct digi_serial), GFP_KERNEL);
1553         if (serial_priv == NULL) {
1554                 for (i = 0; i < serial->type->num_ports + 1; i++)
1555                         kfree(usb_get_serial_port_data(serial->port[i]));
1556                 return 1;                       /* error */
1557         }
1558
1559         /* initialize serial private structure */
1560         spin_lock_init(&serial_priv->ds_serial_lock);
1561         serial_priv->ds_oob_port_num = serial->type->num_ports;
1562         serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1563         serial_priv->ds_device_started = 0;
1564         usb_set_serial_data(serial, serial_priv);
1565
1566         return 0;
1567 }
1568
1569
1570 static void digi_shutdown(struct usb_serial *serial)
1571 {
1572         int i;
1573         dbg("digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt());
1574
1575         /* stop reads and writes on all ports */
1576         for (i = 0; i < serial->type->num_ports + 1; i++) {
1577                 usb_kill_urb(serial->port[i]->read_urb);
1578                 usb_kill_urb(serial->port[i]->write_urb);
1579         }
1580
1581         /* free the private data structures for all ports */
1582         /* number of regular ports + 1 for the out-of-band port */
1583         for(i = 0; i < serial->type->num_ports + 1; i++)
1584                 kfree(usb_get_serial_port_data(serial->port[i]));
1585         kfree(usb_get_serial_data(serial));
1586 }
1587
1588
1589 static void digi_read_bulk_callback(struct urb *urb)
1590 {
1591         struct usb_serial_port *port = urb->context;
1592         struct digi_port *priv;
1593         struct digi_serial *serial_priv;
1594         int ret;
1595         int status = urb->status;
1596
1597         dbg("digi_read_bulk_callback: TOP");
1598
1599         /* port sanity check, do not resubmit if port is not valid */
1600         if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
1601                 err("%s: port or port->private is NULL, status=%d",
1602                     __func__, status);
1603                 return;
1604         }
1605         if (port->serial == NULL ||
1606                 (serial_priv=usb_get_serial_data(port->serial)) == NULL) {
1607                 err("%s: serial is bad or serial->private is NULL, status=%d",
1608                         __func__, status);
1609                 return;
1610         }
1611
1612         /* do not resubmit urb if it has any status error */
1613         if (status) {
1614                 err("%s: nonzero read bulk status: status=%d, port=%d",
1615                     __func__, status, priv->dp_port_num);
1616                 return;
1617         }
1618
1619         /* handle oob or inb callback, do not resubmit if error */
1620         if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1621                 if (digi_read_oob_callback(urb) != 0)
1622                         return;
1623         } else {
1624                 if (digi_read_inb_callback(urb) != 0)
1625                         return;
1626         }
1627
1628         /* continue read */
1629         urb->dev = port->serial->dev;
1630         if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) != 0) {
1631                 err("%s: failed resubmitting urb, ret=%d, port=%d",
1632                     __func__, ret, priv->dp_port_num);
1633         }
1634
1635 }
1636
1637 /*
1638 *  Digi Read INB Callback
1639 *
1640 *  Digi Read INB Callback handles reads on the in band ports, sending
1641 *  the data on to the tty subsystem.  When called we know port and
1642 *  port->private are not NULL and port->serial has been validated.
1643 *  It returns 0 if successful, 1 if successful but the port is
1644 *  throttled, and -1 if the sanity checks failed.
1645 */
1646
1647 static int digi_read_inb_callback(struct urb *urb)
1648 {
1649
1650         struct usb_serial_port *port = urb->context;
1651         struct tty_struct *tty = port->port.tty;
1652         struct digi_port *priv = usb_get_serial_port_data(port);
1653         int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1654         int len = ((unsigned char *)urb->transfer_buffer)[1];
1655         int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1656         unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3;
1657         int flag,throttled;
1658         int i;
1659         int status = urb->status;
1660
1661         /* do not process callbacks on closed ports */
1662         /* but do continue the read chain */
1663         if (port->port.count == 0)
1664                 return 0;
1665
1666         /* short/multiple packet check */
1667         if (urb->actual_length != len + 2) {
1668                 err("%s: INCOMPLETE OR MULTIPLE PACKET, urb->status=%d, "
1669                     "port=%d, opcode=%d, len=%d, actual_length=%d, "
1670                     "status=%d", __func__, status, priv->dp_port_num,
1671                     opcode, len, urb->actual_length, port_status);
1672                 return -1;
1673         }
1674
1675         spin_lock(&priv->dp_port_lock);
1676
1677         /* check for throttle; if set, do not resubmit read urb */
1678         /* indicate the read chain needs to be restarted on unthrottle */
1679         throttled = priv->dp_throttled;
1680         if (throttled)
1681                 priv->dp_throttle_restart = 1;
1682
1683         /* receive data */
1684         if (opcode == DIGI_CMD_RECEIVE_DATA) {
1685                 /* get flag from port_status */
1686                 flag = 0;
1687
1688                 /* overrun is special, not associated with a char */
1689                 if (port_status & DIGI_OVERRUN_ERROR)
1690                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1691
1692                 /* break takes precedence over parity, */
1693                 /* which takes precedence over framing errors */
1694                 if (port_status & DIGI_BREAK_ERROR)
1695                         flag = TTY_BREAK;
1696                 else if (port_status & DIGI_PARITY_ERROR)
1697                         flag = TTY_PARITY;
1698                 else if (port_status & DIGI_FRAMING_ERROR)
1699                         flag = TTY_FRAME;
1700
1701                 /* data length is len-1 (one byte of len is port_status) */
1702                 --len;
1703
1704                 len = tty_buffer_request_room(tty, len);
1705                 if (len > 0) {
1706                         /* Hot path */
1707                         if (flag == TTY_NORMAL)
1708                                 tty_insert_flip_string(tty, data, len);
1709                         else {
1710                                 for(i = 0; i < len; i++)
1711                                         tty_insert_flip_char(tty, data[i], flag);
1712                         }
1713                         tty_flip_buffer_push(tty);
1714                 }
1715         }
1716         spin_unlock(&priv->dp_port_lock);
1717
1718         if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1719                 dbg("%s: got RECEIVE_DISABLE", __func__);
1720         else if (opcode != DIGI_CMD_RECEIVE_DATA)
1721                 dbg("%s: unknown opcode: %d", __func__, opcode);
1722
1723         return(throttled ? 1 : 0);
1724
1725 }
1726
1727
1728 /*
1729 *  Digi Read OOB Callback
1730 *
1731 *  Digi Read OOB Callback handles reads on the out of band port.
1732 *  When called we know port and port->private are not NULL and
1733 *  the port->serial is valid.  It returns 0 if successful, and
1734 *  -1 if the sanity checks failed.
1735 */
1736
1737 static int digi_read_oob_callback(struct urb *urb)
1738 {
1739
1740         struct usb_serial_port *port = urb->context;
1741         struct usb_serial *serial = port->serial;
1742         struct digi_port *priv = usb_get_serial_port_data(port);
1743         int opcode, line, status, val;
1744         int i;
1745
1746         dbg("digi_read_oob_callback: port=%d, len=%d",
1747                         priv->dp_port_num, urb->actual_length);
1748
1749         /* handle each oob command */
1750         for(i = 0; i < urb->actual_length - 3;) {
1751                 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1752                 line = ((unsigned char *)urb->transfer_buffer)[i++];
1753                 status = ((unsigned char *)urb->transfer_buffer)[i++];
1754                 val = ((unsigned char *)urb->transfer_buffer)[i++];
1755
1756                 dbg("digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1757                         opcode, line, status, val);
1758
1759                 if (status != 0 || line >= serial->type->num_ports)
1760                         continue;
1761
1762                 port = serial->port[line];
1763
1764                 if ((priv=usb_get_serial_port_data(port)) == NULL)
1765                         return -1;
1766
1767                 if (opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1768                         spin_lock(&priv->dp_port_lock);
1769                         /* convert from digi flags to termiox flags */
1770                         if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1771                                 priv->dp_modem_signals |= TIOCM_CTS;
1772                                 /* port must be open to use tty struct */
1773                                 if (port->port.count
1774                                         && port->port.tty->termios->c_cflag & CRTSCTS) {
1775                                         port->port.tty->hw_stopped = 0;
1776                                         digi_wakeup_write(port);
1777                                 }
1778                         } else {
1779                                 priv->dp_modem_signals &= ~TIOCM_CTS;
1780                                 /* port must be open to use tty struct */
1781                                 if (port->port.count
1782                                         && port->port.tty->termios->c_cflag & CRTSCTS) {
1783                                         port->port.tty->hw_stopped = 1;
1784                                 }
1785                         }
1786                         if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1787                                 priv->dp_modem_signals |= TIOCM_DSR;
1788                         else
1789                                 priv->dp_modem_signals &= ~TIOCM_DSR;
1790                         if (val & DIGI_READ_INPUT_SIGNALS_RI)
1791                                 priv->dp_modem_signals |= TIOCM_RI;
1792                         else
1793                                 priv->dp_modem_signals &= ~TIOCM_RI;
1794                         if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1795                                 priv->dp_modem_signals |= TIOCM_CD;
1796                         else
1797                                 priv->dp_modem_signals &= ~TIOCM_CD;
1798
1799                         wake_up_interruptible(&priv->dp_modem_change_wait);
1800                         spin_unlock(&priv->dp_port_lock);
1801                 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1802                         spin_lock(&priv->dp_port_lock);
1803                         priv->dp_transmit_idle = 1;
1804                         wake_up_interruptible(&priv->dp_transmit_idle_wait);
1805                         spin_unlock(&priv->dp_port_lock);
1806                 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1807                         wake_up_interruptible(&priv->dp_flush_wait);
1808                 }
1809         }
1810         return 0;
1811
1812 }
1813
1814 static int __init digi_init(void)
1815 {
1816         int retval;
1817         retval = usb_serial_register(&digi_acceleport_2_device);
1818         if (retval)
1819                 goto failed_acceleport_2_device;
1820         retval = usb_serial_register(&digi_acceleport_4_device);
1821         if (retval)
1822                 goto failed_acceleport_4_device;
1823         retval = usb_register(&digi_driver);
1824         if (retval)
1825                 goto failed_usb_register;
1826         info(DRIVER_VERSION ":" DRIVER_DESC);
1827         return 0;
1828 failed_usb_register:
1829         usb_serial_deregister(&digi_acceleport_4_device);
1830 failed_acceleport_4_device:
1831         usb_serial_deregister(&digi_acceleport_2_device);
1832 failed_acceleport_2_device:
1833         return retval;
1834 }
1835
1836 static void __exit digi_exit (void)
1837 {
1838         usb_deregister(&digi_driver);
1839         usb_serial_deregister(&digi_acceleport_2_device);
1840         usb_serial_deregister(&digi_acceleport_4_device);
1841 }
1842
1843
1844 module_init(digi_init);
1845 module_exit(digi_exit);
1846
1847
1848 MODULE_AUTHOR(DRIVER_AUTHOR);
1849 MODULE_DESCRIPTION(DRIVER_DESC);
1850 MODULE_LICENSE("GPL");
1851
1852 module_param(debug, bool, S_IRUGO | S_IWUSR);
1853 MODULE_PARM_DESC(debug, "Debug enabled or not");