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

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