linux/drivers/usb/serial/digi_acceleport.c
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   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 <linux/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
 405struct 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
 412struct 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        wait_queue_head_t dp_close_wait;        /* wait queue for close */
 426        struct work_struct dp_wakeup_work;
 427        struct usb_serial_port *dp_port;
 428};
 429
 430
 431/* Local Function Declarations */
 432
 433static void digi_wakeup_write(struct usb_serial_port *port);
 434static void digi_wakeup_write_lock(struct work_struct *work);
 435static int digi_write_oob_command(struct usb_serial_port *port,
 436        unsigned char *buf, int count, int interruptible);
 437static int digi_write_inb_command(struct usb_serial_port *port,
 438        unsigned char *buf, int count, unsigned long timeout);
 439static int digi_set_modem_signals(struct usb_serial_port *port,
 440        unsigned int modem_signals, int interruptible);
 441static int digi_transmit_idle(struct usb_serial_port *port,
 442        unsigned long timeout);
 443static void digi_rx_throttle(struct tty_struct *tty);
 444static void digi_rx_unthrottle(struct tty_struct *tty);
 445static void digi_set_termios(struct tty_struct *tty,
 446                struct usb_serial_port *port, struct ktermios *old_termios);
 447static void digi_break_ctl(struct tty_struct *tty, int break_state);
 448static int digi_tiocmget(struct tty_struct *tty);
 449static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
 450                unsigned int clear);
 451static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
 452                const unsigned char *buf, int count);
 453static void digi_write_bulk_callback(struct urb *urb);
 454static int digi_write_room(struct tty_struct *tty);
 455static int digi_chars_in_buffer(struct tty_struct *tty);
 456static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
 457static void digi_close(struct usb_serial_port *port);
 458static void digi_dtr_rts(struct usb_serial_port *port, int on);
 459static int digi_startup_device(struct usb_serial *serial);
 460static int digi_startup(struct usb_serial *serial);
 461static void digi_disconnect(struct usb_serial *serial);
 462static void digi_release(struct usb_serial *serial);
 463static void digi_read_bulk_callback(struct urb *urb);
 464static int digi_read_inb_callback(struct urb *urb);
 465static int digi_read_oob_callback(struct urb *urb);
 466
 467
 468/* Statics */
 469
 470static int debug;
 471
 472static const 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
 478static const struct usb_device_id id_table_2[] = {
 479        { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
 480        { }                                             /* Terminating entry */
 481};
 482
 483static const struct usb_device_id id_table_4[] = {
 484        { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
 485        { }                                             /* Terminating entry */
 486};
 487
 488MODULE_DEVICE_TABLE(usb, id_table_combined);
 489
 490static 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
 501static 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        .dtr_rts =                      digi_dtr_rts,
 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        .disconnect =                   digi_disconnect,
 526        .release =                      digi_release,
 527};
 528
 529static struct usb_serial_driver digi_acceleport_4_device = {
 530        .driver = {
 531                .owner =                THIS_MODULE,
 532                .name =                 "digi_4",
 533        },
 534        .description =                  "Digi 4 port USB adapter",
 535        .usb_driver =                   &digi_driver,
 536        .id_table =                     id_table_4,
 537        .num_ports =                    4,
 538        .open =                         digi_open,
 539        .close =                        digi_close,
 540        .write =                        digi_write,
 541        .write_room =                   digi_write_room,
 542        .write_bulk_callback =          digi_write_bulk_callback,
 543        .read_bulk_callback =           digi_read_bulk_callback,
 544        .chars_in_buffer =              digi_chars_in_buffer,
 545        .throttle =                     digi_rx_throttle,
 546        .unthrottle =                   digi_rx_unthrottle,
 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        .disconnect =                   digi_disconnect,
 553        .release =                      digi_release,
 554};
 555
 556
 557/* Functions */
 558
 559/*
 560 *  Cond Wait Interruptible Timeout Irqrestore
 561 *
 562 *  Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
 563 *  so that wake ups are not lost if they occur between the unlock
 564 *  and the sleep.  In other words, spin_unlock_irqrestore and
 565 *  interruptible_sleep_on_timeout are "atomic" with respect to
 566 *  wake ups.  This is used to implement condition variables.
 567 *
 568 *  interruptible_sleep_on_timeout is deprecated and has been replaced
 569 *  with the equivalent code.
 570 */
 571
 572static long cond_wait_interruptible_timeout_irqrestore(
 573        wait_queue_head_t *q, long timeout,
 574        spinlock_t *lock, unsigned long flags)
 575__releases(lock)
 576{
 577        DEFINE_WAIT(wait);
 578
 579        prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
 580        spin_unlock_irqrestore(lock, flags);
 581        timeout = schedule_timeout(timeout);
 582        finish_wait(q, &wait);
 583
 584        return timeout;
 585}
 586
 587
 588/*
 589 *  Digi Wakeup Write
 590 *
 591 *  Wake up port, line discipline, and tty processes sleeping
 592 *  on writes.
 593 */
 594
 595static void digi_wakeup_write_lock(struct work_struct *work)
 596{
 597        struct digi_port *priv =
 598                        container_of(work, struct digi_port, dp_wakeup_work);
 599        struct usb_serial_port *port = priv->dp_port;
 600        unsigned long flags;
 601
 602        spin_lock_irqsave(&priv->dp_port_lock, flags);
 603        digi_wakeup_write(port);
 604        spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 605}
 606
 607static void digi_wakeup_write(struct usb_serial_port *port)
 608{
 609        struct tty_struct *tty = tty_port_tty_get(&port->port);
 610        if (tty) {
 611                tty_wakeup(tty);
 612                tty_kref_put(tty);
 613        }
 614}
 615
 616
 617/*
 618 *  Digi Write OOB Command
 619 *
 620 *  Write commands on the out of band port.  Commands are 4
 621 *  bytes each, multiple commands can be sent at once, and
 622 *  no command will be split across USB packets.  Returns 0
 623 *  if successful, -EINTR if interrupted while sleeping and
 624 *  the interruptible flag is true, or a negative error
 625 *  returned by usb_submit_urb.
 626 */
 627
 628static int digi_write_oob_command(struct usb_serial_port *port,
 629        unsigned char *buf, int count, int interruptible)
 630{
 631
 632        int ret = 0;
 633        int len;
 634        struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 635        struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 636        unsigned long flags = 0;
 637
 638        dbg("digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count);
 639
 640        spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 641        while (count > 0) {
 642                while (oob_priv->dp_write_urb_in_use) {
 643                        cond_wait_interruptible_timeout_irqrestore(
 644                                &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
 645                                &oob_priv->dp_port_lock, flags);
 646                        if (interruptible && signal_pending(current))
 647                                return -EINTR;
 648                        spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 649                }
 650
 651                /* len must be a multiple of 4, so commands are not split */
 652                len = min(count, oob_port->bulk_out_size);
 653                if (len > 4)
 654                        len &= ~3;
 655                memcpy(oob_port->write_urb->transfer_buffer, buf, len);
 656                oob_port->write_urb->transfer_buffer_length = len;
 657                oob_port->write_urb->dev = port->serial->dev;
 658                ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
 659                if (ret == 0) {
 660                        oob_priv->dp_write_urb_in_use = 1;
 661                        count -= len;
 662                        buf += len;
 663                }
 664        }
 665        spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
 666        if (ret)
 667                dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
 668                        __func__, ret);
 669        return ret;
 670
 671}
 672
 673
 674/*
 675 *  Digi Write In Band Command
 676 *
 677 *  Write commands on the given port.  Commands are 4
 678 *  bytes each, multiple commands can be sent at once, and
 679 *  no command will be split across USB packets.  If timeout
 680 *  is non-zero, write in band command will return after
 681 *  waiting unsuccessfully for the URB status to clear for
 682 *  timeout ticks.  Returns 0 if successful, or a negative
 683 *  error returned by digi_write.
 684 */
 685
 686static int digi_write_inb_command(struct usb_serial_port *port,
 687        unsigned char *buf, int count, unsigned long timeout)
 688{
 689        int ret = 0;
 690        int len;
 691        struct digi_port *priv = usb_get_serial_port_data(port);
 692        unsigned char *data = port->write_urb->transfer_buffer;
 693        unsigned long flags = 0;
 694
 695        dbg("digi_write_inb_command: TOP: port=%d, count=%d",
 696                priv->dp_port_num, count);
 697
 698        if (timeout)
 699                timeout += jiffies;
 700        else
 701                timeout = ULONG_MAX;
 702
 703        spin_lock_irqsave(&priv->dp_port_lock, flags);
 704        while (count > 0 && ret == 0) {
 705                while (priv->dp_write_urb_in_use &&
 706                       time_before(jiffies, timeout)) {
 707                        cond_wait_interruptible_timeout_irqrestore(
 708                                &port->write_wait, DIGI_RETRY_TIMEOUT,
 709                                &priv->dp_port_lock, flags);
 710                        if (signal_pending(current))
 711                                return -EINTR;
 712                        spin_lock_irqsave(&priv->dp_port_lock, flags);
 713                }
 714
 715                /* len must be a multiple of 4 and small enough to */
 716                /* guarantee the write will send buffered data first, */
 717                /* so commands are in order with data and not split */
 718                len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
 719                if (len > 4)
 720                        len &= ~3;
 721
 722                /* write any buffered data first */
 723                if (priv->dp_out_buf_len > 0) {
 724                        data[0] = DIGI_CMD_SEND_DATA;
 725                        data[1] = priv->dp_out_buf_len;
 726                        memcpy(data + 2, priv->dp_out_buf,
 727                                priv->dp_out_buf_len);
 728                        memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
 729                        port->write_urb->transfer_buffer_length
 730                                = priv->dp_out_buf_len + 2 + len;
 731                } else {
 732                        memcpy(data, buf, len);
 733                        port->write_urb->transfer_buffer_length = len;
 734                }
 735                port->write_urb->dev = port->serial->dev;
 736
 737                ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 738                if (ret == 0) {
 739                        priv->dp_write_urb_in_use = 1;
 740                        priv->dp_out_buf_len = 0;
 741                        count -= len;
 742                        buf += len;
 743                }
 744
 745        }
 746        spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 747
 748        if (ret)
 749                dev_err(&port->dev,
 750                        "%s: usb_submit_urb failed, ret=%d, port=%d\n",
 751                        __func__, ret, priv->dp_port_num);
 752        return ret;
 753}
 754
 755
 756/*
 757 *  Digi Set Modem Signals
 758 *
 759 *  Sets or clears DTR and RTS on the port, according to the
 760 *  modem_signals argument.  Use TIOCM_DTR and TIOCM_RTS flags
 761 *  for the modem_signals argument.  Returns 0 if successful,
 762 *  -EINTR if interrupted while sleeping, or a non-zero error
 763 *  returned by usb_submit_urb.
 764 */
 765
 766static int digi_set_modem_signals(struct usb_serial_port *port,
 767        unsigned int modem_signals, int interruptible)
 768{
 769
 770        int ret;
 771        struct digi_port *port_priv = usb_get_serial_port_data(port);
 772        struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
 773        struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
 774        unsigned char *data = oob_port->write_urb->transfer_buffer;
 775        unsigned long flags = 0;
 776
 777
 778        dbg("digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
 779                port_priv->dp_port_num, modem_signals);
 780
 781        spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 782        spin_lock(&port_priv->dp_port_lock);
 783
 784        while (oob_priv->dp_write_urb_in_use) {
 785                spin_unlock(&port_priv->dp_port_lock);
 786                cond_wait_interruptible_timeout_irqrestore(
 787                        &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
 788                        &oob_priv->dp_port_lock, flags);
 789                if (interruptible && signal_pending(current))
 790                        return -EINTR;
 791                spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
 792                spin_lock(&port_priv->dp_port_lock);
 793        }
 794        data[0] = DIGI_CMD_SET_DTR_SIGNAL;
 795        data[1] = port_priv->dp_port_num;
 796        data[2] = (modem_signals & TIOCM_DTR) ?
 797                                        DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
 798        data[3] = 0;
 799        data[4] = DIGI_CMD_SET_RTS_SIGNAL;
 800        data[5] = port_priv->dp_port_num;
 801        data[6] = (modem_signals & TIOCM_RTS) ?
 802                                        DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
 803        data[7] = 0;
 804
 805        oob_port->write_urb->transfer_buffer_length = 8;
 806        oob_port->write_urb->dev = port->serial->dev;
 807
 808        ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
 809        if (ret == 0) {
 810                oob_priv->dp_write_urb_in_use = 1;
 811                port_priv->dp_modem_signals =
 812                        (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
 813                        | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
 814        }
 815        spin_unlock(&port_priv->dp_port_lock);
 816        spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
 817        if (ret)
 818                dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
 819                        __func__, ret);
 820        return ret;
 821}
 822
 823/*
 824 *  Digi Transmit Idle
 825 *
 826 *  Digi transmit idle waits, up to timeout ticks, for the transmitter
 827 *  to go idle.  It returns 0 if successful or a negative error.
 828 *
 829 *  There are race conditions here if more than one process is calling
 830 *  digi_transmit_idle on the same port at the same time.  However, this
 831 *  is only called from close, and only one process can be in close on a
 832 *  port at a time, so its ok.
 833 */
 834
 835static int digi_transmit_idle(struct usb_serial_port *port,
 836        unsigned long timeout)
 837{
 838        int ret;
 839        unsigned char buf[2];
 840        struct digi_port *priv = usb_get_serial_port_data(port);
 841        unsigned long flags = 0;
 842
 843        spin_lock_irqsave(&priv->dp_port_lock, flags);
 844        priv->dp_transmit_idle = 0;
 845        spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 846
 847        buf[0] = DIGI_CMD_TRANSMIT_IDLE;
 848        buf[1] = 0;
 849
 850        timeout += jiffies;
 851
 852        ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
 853        if (ret != 0)
 854                return ret;
 855
 856        spin_lock_irqsave(&priv->dp_port_lock, flags);
 857
 858        while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
 859                cond_wait_interruptible_timeout_irqrestore(
 860                        &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
 861                        &priv->dp_port_lock, flags);
 862                if (signal_pending(current))
 863                        return -EINTR;
 864                spin_lock_irqsave(&priv->dp_port_lock, flags);
 865        }
 866        priv->dp_transmit_idle = 0;
 867        spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 868        return 0;
 869
 870}
 871
 872
 873static void digi_rx_throttle(struct tty_struct *tty)
 874{
 875        unsigned long flags;
 876        struct usb_serial_port *port = tty->driver_data;
 877        struct digi_port *priv = usb_get_serial_port_data(port);
 878
 879
 880        dbg("digi_rx_throttle: TOP: port=%d", priv->dp_port_num);
 881
 882        /* stop receiving characters by not resubmitting the read urb */
 883        spin_lock_irqsave(&priv->dp_port_lock, flags);
 884        priv->dp_throttled = 1;
 885        priv->dp_throttle_restart = 0;
 886        spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 887}
 888
 889
 890static void digi_rx_unthrottle(struct tty_struct *tty)
 891{
 892        int ret = 0;
 893        unsigned long flags;
 894        struct usb_serial_port *port = tty->driver_data;
 895        struct digi_port *priv = usb_get_serial_port_data(port);
 896
 897        dbg("digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num);
 898
 899        spin_lock_irqsave(&priv->dp_port_lock, flags);
 900
 901        /* restart read chain */
 902        if (priv->dp_throttle_restart) {
 903                port->read_urb->dev = port->serial->dev;
 904                ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 905        }
 906
 907        /* turn throttle off */
 908        priv->dp_throttled = 0;
 909        priv->dp_throttle_restart = 0;
 910
 911        spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 912
 913        if (ret)
 914                dev_err(&port->dev,
 915                        "%s: usb_submit_urb failed, ret=%d, port=%d\n",
 916                        __func__, ret, priv->dp_port_num);
 917}
 918
 919
 920static void digi_set_termios(struct tty_struct *tty,
 921                struct usb_serial_port *port, struct ktermios *old_termios)
 922{
 923        struct digi_port *priv = usb_get_serial_port_data(port);
 924        unsigned int iflag = tty->termios->c_iflag;
 925        unsigned int cflag = tty->termios->c_cflag;
 926        unsigned int old_iflag = old_termios->c_iflag;
 927        unsigned int old_cflag = old_termios->c_cflag;
 928        unsigned char buf[32];
 929        unsigned int modem_signals;
 930        int arg, ret;
 931        int i = 0;
 932        speed_t baud;
 933
 934        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);
 935
 936        /* set baud rate */
 937        baud = tty_get_baud_rate(tty);
 938        if (baud != tty_termios_baud_rate(old_termios)) {
 939                arg = -1;
 940
 941                /* reassert DTR and (maybe) RTS on transition from B0 */
 942                if ((old_cflag&CBAUD) == B0) {
 943                        /* don't set RTS if using hardware flow control */
 944                        /* and throttling input */
 945                        modem_signals = TIOCM_DTR;
 946                        if (!(tty->termios->c_cflag & CRTSCTS) ||
 947                            !test_bit(TTY_THROTTLED, &tty->flags))
 948                                modem_signals |= TIOCM_RTS;
 949                        digi_set_modem_signals(port, modem_signals, 1);
 950                }
 951                switch (baud) {
 952                /* drop DTR and RTS on transition to B0 */
 953                case 0: digi_set_modem_signals(port, 0, 1); break;
 954                case 50: arg = DIGI_BAUD_50; break;
 955                case 75: arg = DIGI_BAUD_75; break;
 956                case 110: arg = DIGI_BAUD_110; break;
 957                case 150: arg = DIGI_BAUD_150; break;
 958                case 200: arg = DIGI_BAUD_200; break;
 959                case 300: arg = DIGI_BAUD_300; break;
 960                case 600: arg = DIGI_BAUD_600; break;
 961                case 1200: arg = DIGI_BAUD_1200; break;
 962                case 1800: arg = DIGI_BAUD_1800; break;
 963                case 2400: arg = DIGI_BAUD_2400; break;
 964                case 4800: arg = DIGI_BAUD_4800; break;
 965                case 9600: arg = DIGI_BAUD_9600; break;
 966                case 19200: arg = DIGI_BAUD_19200; break;
 967                case 38400: arg = DIGI_BAUD_38400; break;
 968                case 57600: arg = DIGI_BAUD_57600; break;
 969                case 115200: arg = DIGI_BAUD_115200; break;
 970                case 230400: arg = DIGI_BAUD_230400; break;
 971                case 460800: arg = DIGI_BAUD_460800; break;
 972                default:
 973                        arg = DIGI_BAUD_9600;
 974                        baud = 9600;
 975                        break;
 976                }
 977                if (arg != -1) {
 978                        buf[i++] = DIGI_CMD_SET_BAUD_RATE;
 979                        buf[i++] = priv->dp_port_num;
 980                        buf[i++] = arg;
 981                        buf[i++] = 0;
 982                }
 983        }
 984        /* set parity */
 985        tty->termios->c_cflag &= ~CMSPAR;
 986
 987        if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
 988                if (cflag&PARENB) {
 989                        if (cflag&PARODD)
 990                                arg = DIGI_PARITY_ODD;
 991                        else
 992                                arg = DIGI_PARITY_EVEN;
 993                } else {
 994                        arg = DIGI_PARITY_NONE;
 995                }
 996                buf[i++] = DIGI_CMD_SET_PARITY;
 997                buf[i++] = priv->dp_port_num;
 998                buf[i++] = arg;
 999                buf[i++] = 0;
1000        }
1001        /* set word size */
1002        if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
1003                arg = -1;
1004                switch (cflag&CSIZE) {
1005                case CS5: arg = DIGI_WORD_SIZE_5; break;
1006                case CS6: arg = DIGI_WORD_SIZE_6; break;
1007                case CS7: arg = DIGI_WORD_SIZE_7; break;
1008                case CS8: arg = DIGI_WORD_SIZE_8; break;
1009                default:
1010                        dbg("digi_set_termios: can't handle word size %d",
1011                                (cflag&CSIZE));
1012                        break;
1013                }
1014
1015                if (arg != -1) {
1016                        buf[i++] = DIGI_CMD_SET_WORD_SIZE;
1017                        buf[i++] = priv->dp_port_num;
1018                        buf[i++] = arg;
1019                        buf[i++] = 0;
1020                }
1021
1022        }
1023
1024        /* set stop bits */
1025        if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
1026
1027                if ((cflag&CSTOPB))
1028                        arg = DIGI_STOP_BITS_2;
1029                else
1030                        arg = DIGI_STOP_BITS_1;
1031
1032                buf[i++] = DIGI_CMD_SET_STOP_BITS;
1033                buf[i++] = priv->dp_port_num;
1034                buf[i++] = arg;
1035                buf[i++] = 0;
1036
1037        }
1038
1039        /* set input flow control */
1040        if ((iflag&IXOFF) != (old_iflag&IXOFF)
1041            || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
1042                arg = 0;
1043                if (iflag&IXOFF)
1044                        arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1045                else
1046                        arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1047
1048                if (cflag&CRTSCTS) {
1049                        arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
1050
1051                        /* On USB-4 it is necessary to assert RTS prior */
1052                        /* to selecting RTS input flow control.  */
1053                        buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
1054                        buf[i++] = priv->dp_port_num;
1055                        buf[i++] = DIGI_RTS_ACTIVE;
1056                        buf[i++] = 0;
1057
1058                } else {
1059                        arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
1060                }
1061                buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1062                buf[i++] = priv->dp_port_num;
1063                buf[i++] = arg;
1064                buf[i++] = 0;
1065        }
1066
1067        /* set output flow control */
1068        if ((iflag & IXON) != (old_iflag & IXON)
1069            || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1070                arg = 0;
1071                if (iflag & IXON)
1072                        arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1073                else
1074                        arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1075
1076                if (cflag & CRTSCTS) {
1077                        arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
1078                } else {
1079                        arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
1080                        tty->hw_stopped = 0;
1081                }
1082
1083                buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1084                buf[i++] = priv->dp_port_num;
1085                buf[i++] = arg;
1086                buf[i++] = 0;
1087        }
1088
1089        /* set receive enable/disable */
1090        if ((cflag & CREAD) != (old_cflag & CREAD)) {
1091                if (cflag & CREAD)
1092                        arg = DIGI_ENABLE;
1093                else
1094                        arg = DIGI_DISABLE;
1095
1096                buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
1097                buf[i++] = priv->dp_port_num;
1098                buf[i++] = arg;
1099                buf[i++] = 0;
1100        }
1101        ret = digi_write_oob_command(port, buf, i, 1);
1102        if (ret != 0)
1103                dbg("digi_set_termios: write oob failed, ret=%d", ret);
1104        tty_encode_baud_rate(tty, baud, baud);
1105}
1106
1107
1108static void digi_break_ctl(struct tty_struct *tty, int break_state)
1109{
1110        struct usb_serial_port *port = tty->driver_data;
1111        unsigned char buf[4];
1112
1113        buf[0] = DIGI_CMD_BREAK_CONTROL;
1114        buf[1] = 2;                             /* length */
1115        buf[2] = break_state ? 1 : 0;
1116        buf[3] = 0;                             /* pad */
1117        digi_write_inb_command(port, buf, 4, 0);
1118}
1119
1120
1121static int digi_tiocmget(struct tty_struct *tty)
1122{
1123        struct usb_serial_port *port = tty->driver_data;
1124        struct digi_port *priv = usb_get_serial_port_data(port);
1125        unsigned int val;
1126        unsigned long flags;
1127
1128        dbg("%s: TOP: port=%d", __func__, priv->dp_port_num);
1129
1130        spin_lock_irqsave(&priv->dp_port_lock, flags);
1131        val = priv->dp_modem_signals;
1132        spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1133        return val;
1134}
1135
1136
1137static int digi_tiocmset(struct tty_struct *tty,
1138                                        unsigned int set, unsigned int clear)
1139{
1140        struct usb_serial_port *port = tty->driver_data;
1141        struct digi_port *priv = usb_get_serial_port_data(port);
1142        unsigned int val;
1143        unsigned long flags;
1144
1145        dbg("%s: TOP: port=%d", __func__, priv->dp_port_num);
1146
1147        spin_lock_irqsave(&priv->dp_port_lock, flags);
1148        val = (priv->dp_modem_signals & ~clear) | set;
1149        spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1150        return digi_set_modem_signals(port, val, 1);
1151}
1152
1153
1154static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
1155                                        const unsigned char *buf, int count)
1156{
1157
1158        int ret, data_len, new_len;
1159        struct digi_port *priv = usb_get_serial_port_data(port);
1160        unsigned char *data = port->write_urb->transfer_buffer;
1161        unsigned long flags = 0;
1162
1163        dbg("digi_write: TOP: port=%d, count=%d, in_interrupt=%ld",
1164                priv->dp_port_num, count, in_interrupt());
1165
1166        /* copy user data (which can sleep) before getting spin lock */
1167        count = min(count, port->bulk_out_size-2);
1168        count = min(64, count);
1169
1170        /* be sure only one write proceeds at a time */
1171        /* there are races on the port private buffer */
1172        spin_lock_irqsave(&priv->dp_port_lock, flags);
1173
1174        /* wait for urb status clear to submit another urb */
1175        if (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        ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1211        if (ret == 0) {
1212                priv->dp_write_urb_in_use = 1;
1213                ret = new_len;
1214                priv->dp_out_buf_len = 0;
1215        }
1216
1217        /* return length of new data written, or error */
1218        spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1219        if (ret < 0)
1220                dev_err(&port->dev,
1221                        "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1222                        __func__, ret, priv->dp_port_num);
1223        dbg("digi_write: returning %d", ret);
1224        return ret;
1225
1226}
1227
1228static void digi_write_bulk_callback(struct urb *urb)
1229{
1230
1231        struct usb_serial_port *port = urb->context;
1232        struct usb_serial *serial;
1233        struct digi_port *priv;
1234        struct digi_serial *serial_priv;
1235        int ret = 0;
1236        int status = urb->status;
1237
1238        dbg("digi_write_bulk_callback: TOP, status=%d", status);
1239
1240        /* port and serial sanity check */
1241        if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
1242                pr_err("%s: port or port->private is NULL, status=%d\n",
1243                        __func__, status);
1244                return;
1245        }
1246        serial = port->serial;
1247        if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
1248                dev_err(&port->dev,
1249                        "%s: serial or serial->private is NULL, status=%d\n",
1250                        __func__, status);
1251                return;
1252        }
1253
1254        /* handle oob callback */
1255        if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1256                dbg("digi_write_bulk_callback: oob callback");
1257                spin_lock(&priv->dp_port_lock);
1258                priv->dp_write_urb_in_use = 0;
1259                wake_up_interruptible(&port->write_wait);
1260                spin_unlock(&priv->dp_port_lock);
1261                return;
1262        }
1263
1264        /* try to send any buffered data on this port */
1265        spin_lock(&priv->dp_port_lock);
1266        priv->dp_write_urb_in_use = 0;
1267        if (priv->dp_out_buf_len > 0) {
1268                *((unsigned char *)(port->write_urb->transfer_buffer))
1269                        = (unsigned char)DIGI_CMD_SEND_DATA;
1270                *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
1271                        = (unsigned char)priv->dp_out_buf_len;
1272                port->write_urb->transfer_buffer_length =
1273                                                priv->dp_out_buf_len + 2;
1274                port->write_urb->dev = serial->dev;
1275                memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1276                        priv->dp_out_buf_len);
1277                ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1278                if (ret == 0) {
1279                        priv->dp_write_urb_in_use = 1;
1280                        priv->dp_out_buf_len = 0;
1281                }
1282        }
1283        /* wake up processes sleeping on writes immediately */
1284        digi_wakeup_write(port);
1285        /* also queue up a wakeup at scheduler time, in case we */
1286        /* lost the race in write_chan(). */
1287        schedule_work(&priv->dp_wakeup_work);
1288
1289        spin_unlock(&priv->dp_port_lock);
1290        if (ret && ret != -EPERM)
1291                dev_err(&port->dev,
1292                        "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1293                        __func__, ret, priv->dp_port_num);
1294}
1295
1296static int digi_write_room(struct tty_struct *tty)
1297{
1298        struct usb_serial_port *port = tty->driver_data;
1299        struct digi_port *priv = usb_get_serial_port_data(port);
1300        int room;
1301        unsigned long flags = 0;
1302
1303        spin_lock_irqsave(&priv->dp_port_lock, flags);
1304
1305        if (priv->dp_write_urb_in_use)
1306                room = 0;
1307        else
1308                room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1309
1310        spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1311        dbg("digi_write_room: port=%d, room=%d", priv->dp_port_num, room);
1312        return room;
1313
1314}
1315
1316static int digi_chars_in_buffer(struct tty_struct *tty)
1317{
1318        struct usb_serial_port *port = tty->driver_data;
1319        struct digi_port *priv = usb_get_serial_port_data(port);
1320
1321        if (priv->dp_write_urb_in_use) {
1322                dbg("digi_chars_in_buffer: port=%d, chars=%d",
1323                        priv->dp_port_num, port->bulk_out_size - 2);
1324                /* return(port->bulk_out_size - 2); */
1325                return 256;
1326        } else {
1327                dbg("digi_chars_in_buffer: port=%d, chars=%d",
1328                        priv->dp_port_num, priv->dp_out_buf_len);
1329                return priv->dp_out_buf_len;
1330        }
1331
1332}
1333
1334static void digi_dtr_rts(struct usb_serial_port *port, int on)
1335{
1336        /* Adjust DTR and RTS */
1337        digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
1338}
1339
1340static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1341{
1342        int ret;
1343        unsigned char buf[32];
1344        struct digi_port *priv = usb_get_serial_port_data(port);
1345        struct ktermios not_termios;
1346
1347        dbg("digi_open: TOP: port=%d", priv->dp_port_num);
1348
1349        /* be sure the device is started up */
1350        if (digi_startup_device(port->serial) != 0)
1351                return -ENXIO;
1352
1353        /* read modem signals automatically whenever they change */
1354        buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1355        buf[1] = priv->dp_port_num;
1356        buf[2] = DIGI_ENABLE;
1357        buf[3] = 0;
1358
1359        /* flush fifos */
1360        buf[4] = DIGI_CMD_IFLUSH_FIFO;
1361        buf[5] = priv->dp_port_num;
1362        buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1363        buf[7] = 0;
1364
1365        ret = digi_write_oob_command(port, buf, 8, 1);
1366        if (ret != 0)
1367                dbg("digi_open: write oob failed, ret=%d", ret);
1368
1369        /* set termios settings */
1370        if (tty) {
1371                not_termios.c_cflag = ~tty->termios->c_cflag;
1372                not_termios.c_iflag = ~tty->termios->c_iflag;
1373                digi_set_termios(tty, port, &not_termios);
1374        }
1375        return 0;
1376}
1377
1378
1379static void digi_close(struct usb_serial_port *port)
1380{
1381        DEFINE_WAIT(wait);
1382        int ret;
1383        unsigned char buf[32];
1384        struct digi_port *priv = usb_get_serial_port_data(port);
1385
1386        dbg("digi_close: TOP: port=%d", priv->dp_port_num);
1387
1388        mutex_lock(&port->serial->disc_mutex);
1389        /* if disconnected, just clear flags */
1390        if (port->serial->disconnected)
1391                goto exit;
1392
1393        if (port->serial->dev) {
1394                /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1395                digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1396
1397                /* disable input flow control */
1398                buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1399                buf[1] = priv->dp_port_num;
1400                buf[2] = DIGI_DISABLE;
1401                buf[3] = 0;
1402
1403                /* disable output flow control */
1404                buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1405                buf[5] = priv->dp_port_num;
1406                buf[6] = DIGI_DISABLE;
1407                buf[7] = 0;
1408
1409                /* disable reading modem signals automatically */
1410                buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1411                buf[9] = priv->dp_port_num;
1412                buf[10] = DIGI_DISABLE;
1413                buf[11] = 0;
1414
1415                /* disable receive */
1416                buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1417                buf[13] = priv->dp_port_num;
1418                buf[14] = DIGI_DISABLE;
1419                buf[15] = 0;
1420
1421                /* flush fifos */
1422                buf[16] = DIGI_CMD_IFLUSH_FIFO;
1423                buf[17] = priv->dp_port_num;
1424                buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1425                buf[19] = 0;
1426
1427                ret = digi_write_oob_command(port, buf, 20, 0);
1428                if (ret != 0)
1429                        dbg("digi_close: write oob failed, ret=%d", ret);
1430
1431                /* wait for final commands on oob port to complete */
1432                prepare_to_wait(&priv->dp_flush_wait, &wait,
1433                                                        TASK_INTERRUPTIBLE);
1434                schedule_timeout(DIGI_CLOSE_TIMEOUT);
1435                finish_wait(&priv->dp_flush_wait, &wait);
1436
1437                /* shutdown any outstanding bulk writes */
1438                usb_kill_urb(port->write_urb);
1439        }
1440exit:
1441        spin_lock_irq(&priv->dp_port_lock);
1442        priv->dp_write_urb_in_use = 0;
1443        wake_up_interruptible(&priv->dp_close_wait);
1444        spin_unlock_irq(&priv->dp_port_lock);
1445        mutex_unlock(&port->serial->disc_mutex);
1446        dbg("digi_close: done");
1447}
1448
1449
1450/*
1451 *  Digi Startup Device
1452 *
1453 *  Starts reads on all ports.  Must be called AFTER startup, with
1454 *  urbs initialized.  Returns 0 if successful, non-zero error otherwise.
1455 */
1456
1457static int digi_startup_device(struct usb_serial *serial)
1458{
1459        int i, ret = 0;
1460        struct digi_serial *serial_priv = usb_get_serial_data(serial);
1461        struct usb_serial_port *port;
1462
1463        /* be sure this happens exactly once */
1464        spin_lock(&serial_priv->ds_serial_lock);
1465        if (serial_priv->ds_device_started) {
1466                spin_unlock(&serial_priv->ds_serial_lock);
1467                return 0;
1468        }
1469        serial_priv->ds_device_started = 1;
1470        spin_unlock(&serial_priv->ds_serial_lock);
1471
1472        /* start reading from each bulk in endpoint for the device */
1473        /* set USB_DISABLE_SPD flag for write bulk urbs */
1474        for (i = 0; i < serial->type->num_ports + 1; i++) {
1475                port = serial->port[i];
1476                port->write_urb->dev = port->serial->dev;
1477                ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1478                if (ret != 0) {
1479                        dev_err(&port->dev,
1480                                "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1481                                __func__, ret, i);
1482                        break;
1483                }
1484        }
1485        return ret;
1486}
1487
1488
1489static int digi_startup(struct usb_serial *serial)
1490{
1491
1492        int i;
1493        struct digi_port *priv;
1494        struct digi_serial *serial_priv;
1495
1496        dbg("digi_startup: TOP");
1497
1498        /* allocate the private data structures for all ports */
1499        /* number of regular ports + 1 for the out-of-band port */
1500        for (i = 0; i < serial->type->num_ports + 1; i++) {
1501                /* allocate port private structure */
1502                priv = kmalloc(sizeof(struct digi_port), GFP_KERNEL);
1503                if (priv == NULL) {
1504                        while (--i >= 0)
1505                                kfree(usb_get_serial_port_data(serial->port[i]));
1506                        return 1;                       /* error */
1507                }
1508
1509                /* initialize port private structure */
1510                spin_lock_init(&priv->dp_port_lock);
1511                priv->dp_port_num = i;
1512                priv->dp_out_buf_len = 0;
1513                priv->dp_write_urb_in_use = 0;
1514                priv->dp_modem_signals = 0;
1515                init_waitqueue_head(&priv->dp_modem_change_wait);
1516                priv->dp_transmit_idle = 0;
1517                init_waitqueue_head(&priv->dp_transmit_idle_wait);
1518                priv->dp_throttled = 0;
1519                priv->dp_throttle_restart = 0;
1520                init_waitqueue_head(&priv->dp_flush_wait);
1521                init_waitqueue_head(&priv->dp_close_wait);
1522                INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1523                priv->dp_port = serial->port[i];
1524                /* initialize write wait queue for this port */
1525                init_waitqueue_head(&serial->port[i]->write_wait);
1526
1527                usb_set_serial_port_data(serial->port[i], priv);
1528        }
1529
1530        /* allocate serial private structure */
1531        serial_priv = kmalloc(sizeof(struct digi_serial), GFP_KERNEL);
1532        if (serial_priv == NULL) {
1533                for (i = 0; i < serial->type->num_ports + 1; i++)
1534                        kfree(usb_get_serial_port_data(serial->port[i]));
1535                return 1;                       /* error */
1536        }
1537
1538        /* initialize serial private structure */
1539        spin_lock_init(&serial_priv->ds_serial_lock);
1540        serial_priv->ds_oob_port_num = serial->type->num_ports;
1541        serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1542        serial_priv->ds_device_started = 0;
1543        usb_set_serial_data(serial, serial_priv);
1544
1545        return 0;
1546}
1547
1548
1549static void digi_disconnect(struct usb_serial *serial)
1550{
1551        int i;
1552        dbg("digi_disconnect: TOP, in_interrupt()=%ld", in_interrupt());
1553
1554        /* stop reads and writes on all ports */
1555        for (i = 0; i < serial->type->num_ports + 1; i++) {
1556                usb_kill_urb(serial->port[i]->read_urb);
1557                usb_kill_urb(serial->port[i]->write_urb);
1558        }
1559}
1560
1561
1562static void digi_release(struct usb_serial *serial)
1563{
1564        int i;
1565        dbg("digi_release: TOP, in_interrupt()=%ld", in_interrupt());
1566
1567        /* free the private data structures for all ports */
1568        /* number of regular ports + 1 for the out-of-band port */
1569        for (i = 0; i < serial->type->num_ports + 1; i++)
1570                kfree(usb_get_serial_port_data(serial->port[i]));
1571        kfree(usb_get_serial_data(serial));
1572}
1573
1574
1575static void digi_read_bulk_callback(struct urb *urb)
1576{
1577        struct usb_serial_port *port = urb->context;
1578        struct digi_port *priv;
1579        struct digi_serial *serial_priv;
1580        int ret;
1581        int status = urb->status;
1582
1583        dbg("digi_read_bulk_callback: TOP");
1584
1585        /* port sanity check, do not resubmit if port is not valid */
1586        if (port == NULL)
1587                return;
1588        priv = usb_get_serial_port_data(port);
1589        if (priv == NULL) {
1590                dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1591                        __func__, status);
1592                return;
1593        }
1594        if (port->serial == NULL ||
1595                (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1596                dev_err(&port->dev, "%s: serial is bad or serial->private "
1597                        "is NULL, status=%d\n", __func__, status);
1598                return;
1599        }
1600
1601        /* do not resubmit urb if it has any status error */
1602        if (status) {
1603                dev_err(&port->dev,
1604                        "%s: nonzero read bulk status: status=%d, port=%d\n",
1605                        __func__, status, priv->dp_port_num);
1606                return;
1607        }
1608
1609        /* handle oob or inb callback, do not resubmit if error */
1610        if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1611                if (digi_read_oob_callback(urb) != 0)
1612                        return;
1613        } else {
1614                if (digi_read_inb_callback(urb) != 0)
1615                        return;
1616        }
1617
1618        /* continue read */
1619        urb->dev = port->serial->dev;
1620        ret = usb_submit_urb(urb, GFP_ATOMIC);
1621        if (ret != 0 && ret != -EPERM) {
1622                dev_err(&port->dev,
1623                        "%s: failed resubmitting urb, ret=%d, port=%d\n",
1624                        __func__, ret, priv->dp_port_num);
1625        }
1626
1627}
1628
1629/*
1630 *  Digi Read INB Callback
1631 *
1632 *  Digi Read INB Callback handles reads on the in band ports, sending
1633 *  the data on to the tty subsystem.  When called we know port and
1634 *  port->private are not NULL and port->serial has been validated.
1635 *  It returns 0 if successful, 1 if successful but the port is
1636 *  throttled, and -1 if the sanity checks failed.
1637 */
1638
1639static int digi_read_inb_callback(struct urb *urb)
1640{
1641
1642        struct usb_serial_port *port = urb->context;
1643        struct tty_struct *tty;
1644        struct digi_port *priv = usb_get_serial_port_data(port);
1645        int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1646        int len = ((unsigned char *)urb->transfer_buffer)[1];
1647        int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1648        unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3;
1649        int flag, throttled;
1650        int status = urb->status;
1651
1652        /* do not process callbacks on closed ports */
1653        /* but do continue the read chain */
1654        if (urb->status == -ENOENT)
1655                return 0;
1656
1657        /* short/multiple packet check */
1658        if (urb->actual_length != len + 2) {
1659                dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, "
1660                        "status=%d, port=%d, opcode=%d, len=%d, "
1661                        "actual_length=%d, status=%d\n", __func__, status,
1662                        priv->dp_port_num, opcode, len, urb->actual_length,
1663                        port_status);
1664                return -1;
1665        }
1666
1667        tty = tty_port_tty_get(&port->port);
1668        spin_lock(&priv->dp_port_lock);
1669
1670        /* check for throttle; if set, do not resubmit read urb */
1671        /* indicate the read chain needs to be restarted on unthrottle */
1672        throttled = priv->dp_throttled;
1673        if (throttled)
1674                priv->dp_throttle_restart = 1;
1675
1676        /* receive data */
1677        if (tty && opcode == DIGI_CMD_RECEIVE_DATA) {
1678                /* get flag from port_status */
1679                flag = 0;
1680
1681                /* overrun is special, not associated with a char */
1682                if (port_status & DIGI_OVERRUN_ERROR)
1683                        tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1684
1685                /* break takes precedence over parity, */
1686                /* which takes precedence over framing errors */
1687                if (port_status & DIGI_BREAK_ERROR)
1688                        flag = TTY_BREAK;
1689                else if (port_status & DIGI_PARITY_ERROR)
1690                        flag = TTY_PARITY;
1691                else if (port_status & DIGI_FRAMING_ERROR)
1692                        flag = TTY_FRAME;
1693
1694                /* data length is len-1 (one byte of len is port_status) */
1695                --len;
1696                if (len > 0) {
1697                        tty_insert_flip_string_fixed_flag(tty, data, flag,
1698                                                                        len);
1699                        tty_flip_buffer_push(tty);
1700                }
1701        }
1702        spin_unlock(&priv->dp_port_lock);
1703        tty_kref_put(tty);
1704
1705        if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1706                dbg("%s: got RECEIVE_DISABLE", __func__);
1707        else if (opcode != DIGI_CMD_RECEIVE_DATA)
1708                dbg("%s: unknown opcode: %d", __func__, opcode);
1709
1710        return throttled ? 1 : 0;
1711
1712}
1713
1714
1715/*
1716 *  Digi Read OOB Callback
1717 *
1718 *  Digi Read OOB Callback handles reads on the out of band port.
1719 *  When called we know port and port->private are not NULL and
1720 *  the port->serial is valid.  It returns 0 if successful, and
1721 *  -1 if the sanity checks failed.
1722 */
1723
1724static int digi_read_oob_callback(struct urb *urb)
1725{
1726
1727        struct usb_serial_port *port = urb->context;
1728        struct usb_serial *serial = port->serial;
1729        struct tty_struct *tty;
1730        struct digi_port *priv = usb_get_serial_port_data(port);
1731        int opcode, line, status, val;
1732        int i;
1733        unsigned int rts;
1734
1735        dbg("digi_read_oob_callback: port=%d, len=%d",
1736                        priv->dp_port_num, urb->actual_length);
1737
1738        /* handle each oob command */
1739        for (i = 0; i < urb->actual_length - 3;) {
1740                opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1741                line = ((unsigned char *)urb->transfer_buffer)[i++];
1742                status = ((unsigned char *)urb->transfer_buffer)[i++];
1743                val = ((unsigned char *)urb->transfer_buffer)[i++];
1744
1745                dbg("digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1746                        opcode, line, status, val);
1747
1748                if (status != 0 || line >= serial->type->num_ports)
1749                        continue;
1750
1751                port = serial->port[line];
1752
1753                priv = usb_get_serial_port_data(port);
1754                if (priv == NULL)
1755                        return -1;
1756
1757                tty = tty_port_tty_get(&port->port);
1758
1759                rts = 0;
1760                if (tty)
1761                        rts = tty->termios->c_cflag & CRTSCTS;
1762                
1763                if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1764                        spin_lock(&priv->dp_port_lock);
1765                        /* convert from digi flags to termiox flags */
1766                        if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1767                                priv->dp_modem_signals |= TIOCM_CTS;
1768                                /* port must be open to use tty struct */
1769                                if (rts) {
1770                                        tty->hw_stopped = 0;
1771                                        digi_wakeup_write(port);
1772                                }
1773                        } else {
1774                                priv->dp_modem_signals &= ~TIOCM_CTS;
1775                                /* port must be open to use tty struct */
1776                                if (rts)
1777                                        tty->hw_stopped = 1;
1778                        }
1779                        if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1780                                priv->dp_modem_signals |= TIOCM_DSR;
1781                        else
1782                                priv->dp_modem_signals &= ~TIOCM_DSR;
1783                        if (val & DIGI_READ_INPUT_SIGNALS_RI)
1784                                priv->dp_modem_signals |= TIOCM_RI;
1785                        else
1786                                priv->dp_modem_signals &= ~TIOCM_RI;
1787                        if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1788                                priv->dp_modem_signals |= TIOCM_CD;
1789                        else
1790                                priv->dp_modem_signals &= ~TIOCM_CD;
1791
1792                        wake_up_interruptible(&priv->dp_modem_change_wait);
1793                        spin_unlock(&priv->dp_port_lock);
1794                } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1795                        spin_lock(&priv->dp_port_lock);
1796                        priv->dp_transmit_idle = 1;
1797                        wake_up_interruptible(&priv->dp_transmit_idle_wait);
1798                        spin_unlock(&priv->dp_port_lock);
1799                } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1800                        wake_up_interruptible(&priv->dp_flush_wait);
1801                }
1802                tty_kref_put(tty);
1803        }
1804        return 0;
1805
1806}
1807
1808static int __init digi_init(void)
1809{
1810        int retval;
1811        retval = usb_serial_register(&digi_acceleport_2_device);
1812        if (retval)
1813                goto failed_acceleport_2_device;
1814        retval = usb_serial_register(&digi_acceleport_4_device);
1815        if (retval)
1816                goto failed_acceleport_4_device;
1817        retval = usb_register(&digi_driver);
1818        if (retval)
1819                goto failed_usb_register;
1820        printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1821               DRIVER_DESC "\n");
1822        return 0;
1823failed_usb_register:
1824        usb_serial_deregister(&digi_acceleport_4_device);
1825failed_acceleport_4_device:
1826        usb_serial_deregister(&digi_acceleport_2_device);
1827failed_acceleport_2_device:
1828        return retval;
1829}
1830
1831static void __exit digi_exit (void)
1832{
1833        usb_deregister(&digi_driver);
1834        usb_serial_deregister(&digi_acceleport_2_device);
1835        usb_serial_deregister(&digi_acceleport_4_device);
1836}
1837
1838
1839module_init(digi_init);
1840module_exit(digi_exit);
1841
1842
1843MODULE_AUTHOR(DRIVER_AUTHOR);
1844MODULE_DESCRIPTION(DRIVER_DESC);
1845MODULE_LICENSE("GPL");
1846
1847module_param(debug, bool, S_IRUGO | S_IWUSR);
1848MODULE_PARM_DESC(debug, "Debug enabled or not");
1849