2 * Digi AccelePort USB-4 and USB-2 Serial Converters
4 * Copyright 2000 by Digi International
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.
11 * Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
14 * Peter Berger (pberger@brimson.com)
15 * Al Borchers (borchers@steinerpoint.com)
18 * switched to using port->open_count instead of private version.
19 * Removed port->active
22 * Identify version on module load.
24 * (11/01/2000) Adam J. Richter
25 * usb_device_id table support
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.
35 * -- Fixed bug with urb->dev not being set properly, now that the usb
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
50 * -- Added code for rx_throttle and rx_unthrottle so that input flow
52 * -- Added code to set overrun, parity, framing, and break errors
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.
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.
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.
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.
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.
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
110 * -- Initialized ret value to 0 in write_bulk_callback, otherwise
111 * the uninitialized value could cause a spurious debugging message.
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.
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.
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
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.
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
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).
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.
202 * (5/3/2000) pberger and borchers
203 * -- First alpha version of the driver--many known limitations and bugs.
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
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
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.
233 * $Id: digi_acceleport.c,v 1.80.1.2 2000/11/02 05:45:08 root Exp $
236 #include <linux/kernel.h>
237 #include <linux/errno.h>
238 #include <linux/init.h>
239 #include <linux/slab.h>
240 #include <linux/tty.h>
241 #include <linux/tty_driver.h>
242 #include <linux/tty_flip.h>
243 #include <linux/module.h>
244 #include <linux/spinlock.h>
245 #include <linux/workqueue.h>
246 #include <asm/uaccess.h>
247 #include <linux/usb.h>
248 #include <linux/wait.h>
249 #include <linux/usb/serial.h>
254 * Version Information
256 #define DRIVER_VERSION "v1.80.1.2"
257 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
258 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
260 /* port output buffer length -- must be <= transfer buffer length - 2 */
261 /* so we can be sure to send the full buffer in one urb */
262 #define DIGI_OUT_BUF_SIZE 8
264 /* port input buffer length -- must be >= transfer buffer length - 3 */
265 /* so we can be sure to hold at least one full buffer from one urb */
266 #define DIGI_IN_BUF_SIZE 64
268 /* retry timeout while sleeping */
269 #define DIGI_RETRY_TIMEOUT (HZ/10)
271 /* timeout while waiting for tty output to drain in close */
272 /* this delay is used twice in close, so the total delay could */
273 /* be twice this value */
274 #define DIGI_CLOSE_TIMEOUT (5*HZ)
277 /* AccelePort USB Defines */
280 #define DIGI_VENDOR_ID 0x05c5
281 #define DIGI_2_ID 0x0002 /* USB-2 */
282 #define DIGI_4_ID 0x0004 /* USB-4 */
285 * "INB": can be used on the in-band endpoint
286 * "OOB": can be used on the out-of-band endpoint
288 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
289 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
290 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
291 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
292 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
293 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
294 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
295 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
296 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
297 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
298 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
299 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
300 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
301 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
302 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
303 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
304 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
305 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
306 #define DIGI_CMD_SEND_DATA 18 /* INB */
307 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */
308 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
309 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
312 #define DIGI_BAUD_50 0
313 #define DIGI_BAUD_75 1
314 #define DIGI_BAUD_110 2
315 #define DIGI_BAUD_150 3
316 #define DIGI_BAUD_200 4
317 #define DIGI_BAUD_300 5
318 #define DIGI_BAUD_600 6
319 #define DIGI_BAUD_1200 7
320 #define DIGI_BAUD_1800 8
321 #define DIGI_BAUD_2400 9
322 #define DIGI_BAUD_4800 10
323 #define DIGI_BAUD_7200 11
324 #define DIGI_BAUD_9600 12
325 #define DIGI_BAUD_14400 13
326 #define DIGI_BAUD_19200 14
327 #define DIGI_BAUD_28800 15
328 #define DIGI_BAUD_38400 16
329 #define DIGI_BAUD_57600 17
330 #define DIGI_BAUD_76800 18
331 #define DIGI_BAUD_115200 19
332 #define DIGI_BAUD_153600 20
333 #define DIGI_BAUD_230400 21
334 #define DIGI_BAUD_460800 22
337 #define DIGI_WORD_SIZE_5 0
338 #define DIGI_WORD_SIZE_6 1
339 #define DIGI_WORD_SIZE_7 2
340 #define DIGI_WORD_SIZE_8 3
342 #define DIGI_PARITY_NONE 0
343 #define DIGI_PARITY_ODD 1
344 #define DIGI_PARITY_EVEN 2
345 #define DIGI_PARITY_MARK 3
346 #define DIGI_PARITY_SPACE 4
348 #define DIGI_STOP_BITS_1 0
349 #define DIGI_STOP_BITS_2 1
351 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
352 #define DIGI_INPUT_FLOW_CONTROL_RTS 2
353 #define DIGI_INPUT_FLOW_CONTROL_DTR 4
355 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
356 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
357 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
359 #define DIGI_DTR_INACTIVE 0
360 #define DIGI_DTR_ACTIVE 1
361 #define DIGI_DTR_INPUT_FLOW_CONTROL 2
363 #define DIGI_RTS_INACTIVE 0
364 #define DIGI_RTS_ACTIVE 1
365 #define DIGI_RTS_INPUT_FLOW_CONTROL 2
366 #define DIGI_RTS_TOGGLE 3
368 #define DIGI_FLUSH_TX 1
369 #define DIGI_FLUSH_RX 2
370 #define DIGI_RESUME_TX 4 /* clears xoff condition */
372 #define DIGI_TRANSMIT_NOT_IDLE 0
373 #define DIGI_TRANSMIT_IDLE 1
375 #define DIGI_DISABLE 0
376 #define DIGI_ENABLE 1
378 #define DIGI_DEASSERT 0
379 #define DIGI_ASSERT 1
381 /* in band status codes */
382 #define DIGI_OVERRUN_ERROR 4
383 #define DIGI_PARITY_ERROR 8
384 #define DIGI_FRAMING_ERROR 16
385 #define DIGI_BREAK_ERROR 32
387 /* out of band status */
388 #define DIGI_NO_ERROR 0
389 #define DIGI_BAD_FIRST_PARAMETER 1
390 #define DIGI_BAD_SECOND_PARAMETER 2
391 #define DIGI_INVALID_LINE 3
392 #define DIGI_INVALID_OPCODE 4
395 #define DIGI_READ_INPUT_SIGNALS_SLOT 1
396 #define DIGI_READ_INPUT_SIGNALS_ERR 2
397 #define DIGI_READ_INPUT_SIGNALS_BUSY 4
398 #define DIGI_READ_INPUT_SIGNALS_PE 8
399 #define DIGI_READ_INPUT_SIGNALS_CTS 16
400 #define DIGI_READ_INPUT_SIGNALS_DSR 32
401 #define DIGI_READ_INPUT_SIGNALS_RI 64
402 #define DIGI_READ_INPUT_SIGNALS_DCD 128
408 spinlock_t ds_serial_lock
;
409 struct usb_serial_port
*ds_oob_port
; /* out-of-band port */
410 int ds_oob_port_num
; /* index of out-of-band port */
411 int ds_device_started
;
415 spinlock_t dp_port_lock
;
418 unsigned char dp_out_buf
[DIGI_OUT_BUF_SIZE
];
420 unsigned char dp_in_buf
[DIGI_IN_BUF_SIZE
];
421 unsigned char dp_in_flag_buf
[DIGI_IN_BUF_SIZE
];
422 int dp_write_urb_in_use
;
423 unsigned int dp_modem_signals
;
424 wait_queue_head_t dp_modem_change_wait
;
425 int dp_transmit_idle
;
426 wait_queue_head_t dp_transmit_idle_wait
;
428 int dp_throttle_restart
;
429 wait_queue_head_t dp_flush_wait
;
430 int dp_in_close
; /* close in progress */
431 wait_queue_head_t dp_close_wait
; /* wait queue for close */
432 struct work_struct dp_wakeup_work
;
433 struct usb_serial_port
*dp_port
;
437 /* Local Function Declarations */
439 static void digi_wakeup_write( struct usb_serial_port
*port
);
440 static void digi_wakeup_write_lock(struct work_struct
*work
);
441 static int digi_write_oob_command( struct usb_serial_port
*port
,
442 unsigned char *buf
, int count
, int interruptible
);
443 static int digi_write_inb_command( struct usb_serial_port
*port
,
444 unsigned char *buf
, int count
, unsigned long timeout
);
445 static int digi_set_modem_signals( struct usb_serial_port
*port
,
446 unsigned int modem_signals
, int interruptible
);
447 static int digi_transmit_idle( struct usb_serial_port
*port
,
448 unsigned long timeout
);
449 static void digi_rx_throttle (struct usb_serial_port
*port
);
450 static void digi_rx_unthrottle (struct usb_serial_port
*port
);
451 static void digi_set_termios( struct usb_serial_port
*port
,
452 struct ktermios
*old_termios
);
453 static void digi_break_ctl( struct usb_serial_port
*port
, int break_state
);
454 static int digi_ioctl( struct usb_serial_port
*port
, struct file
*file
,
455 unsigned int cmd
, unsigned long arg
);
456 static int digi_tiocmget( struct usb_serial_port
*port
, struct file
*file
);
457 static int digi_tiocmset( struct usb_serial_port
*port
, struct file
*file
,
458 unsigned int set
, unsigned int clear
);
459 static int digi_write( struct usb_serial_port
*port
, const unsigned char *buf
, int count
);
460 static void digi_write_bulk_callback( struct urb
*urb
);
461 static int digi_write_room( struct usb_serial_port
*port
);
462 static int digi_chars_in_buffer( struct usb_serial_port
*port
);
463 static int digi_open( struct usb_serial_port
*port
, struct file
*filp
);
464 static void digi_close( struct usb_serial_port
*port
, struct file
*filp
);
465 static int digi_startup_device( struct usb_serial
*serial
);
466 static int digi_startup( struct usb_serial
*serial
);
467 static void digi_shutdown( struct usb_serial
*serial
);
468 static void digi_read_bulk_callback( struct urb
*urb
);
469 static int digi_read_inb_callback( struct urb
*urb
);
470 static int digi_read_oob_callback( struct urb
*urb
);
477 static struct usb_device_id id_table_combined
[] = {
478 { USB_DEVICE(DIGI_VENDOR_ID
, DIGI_2_ID
) },
479 { USB_DEVICE(DIGI_VENDOR_ID
, DIGI_4_ID
) },
480 { } /* Terminating entry */
483 static struct usb_device_id id_table_2
[] = {
484 { USB_DEVICE(DIGI_VENDOR_ID
, DIGI_2_ID
) },
485 { } /* Terminating entry */
488 static struct usb_device_id id_table_4
[] = {
489 { USB_DEVICE(DIGI_VENDOR_ID
, DIGI_4_ID
) },
490 { } /* Terminating entry */
493 MODULE_DEVICE_TABLE (usb
, id_table_combined
);
495 static struct usb_driver digi_driver
= {
496 .name
= "digi_acceleport",
497 .probe
= usb_serial_probe
,
498 .disconnect
= usb_serial_disconnect
,
499 .id_table
= id_table_combined
,
504 /* device info needed for the Digi serial converter */
506 static struct usb_serial_driver digi_acceleport_2_device
= {
508 .owner
= THIS_MODULE
,
511 .description
= "Digi 2 port USB adapter",
512 .id_table
= id_table_2
,
513 .num_interrupt_in
= 0,
520 .write_room
= digi_write_room
,
521 .write_bulk_callback
= digi_write_bulk_callback
,
522 .read_bulk_callback
= digi_read_bulk_callback
,
523 .chars_in_buffer
= digi_chars_in_buffer
,
524 .throttle
= digi_rx_throttle
,
525 .unthrottle
= digi_rx_unthrottle
,
527 .set_termios
= digi_set_termios
,
528 .break_ctl
= digi_break_ctl
,
529 .tiocmget
= digi_tiocmget
,
530 .tiocmset
= digi_tiocmset
,
531 .attach
= digi_startup
,
532 .shutdown
= digi_shutdown
,
535 static struct usb_serial_driver digi_acceleport_4_device
= {
537 .owner
= THIS_MODULE
,
540 .description
= "Digi 4 port USB adapter",
541 .id_table
= id_table_4
,
542 .num_interrupt_in
= 0,
549 .write_room
= digi_write_room
,
550 .write_bulk_callback
= digi_write_bulk_callback
,
551 .read_bulk_callback
= digi_read_bulk_callback
,
552 .chars_in_buffer
= digi_chars_in_buffer
,
553 .throttle
= digi_rx_throttle
,
554 .unthrottle
= digi_rx_unthrottle
,
556 .set_termios
= digi_set_termios
,
557 .break_ctl
= digi_break_ctl
,
558 .tiocmget
= digi_tiocmget
,
559 .tiocmset
= digi_tiocmset
,
560 .attach
= digi_startup
,
561 .shutdown
= digi_shutdown
,
568 * Cond Wait Interruptible Timeout Irqrestore
570 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
571 * so that wake ups are not lost if they occur between the unlock
572 * and the sleep. In other words, spin_unlock_irqrestore and
573 * interruptible_sleep_on_timeout are "atomic" with respect to
574 * wake ups. This is used to implement condition variables.
576 * interruptible_sleep_on_timeout is deprecated and has been replaced
577 * with the equivalent code.
580 static inline long cond_wait_interruptible_timeout_irqrestore(
581 wait_queue_head_t
*q
, long timeout
,
582 spinlock_t
*lock
, unsigned long flags
)
586 prepare_to_wait(q
, &wait
, TASK_INTERRUPTIBLE
);
587 spin_unlock_irqrestore(lock
, flags
);
588 timeout
= schedule_timeout(timeout
);
589 finish_wait(q
, &wait
);
598 * Wake up port, line discipline, and tty processes sleeping
602 static void digi_wakeup_write_lock(struct work_struct
*work
)
604 struct digi_port
*priv
=
605 container_of(work
, struct digi_port
, dp_wakeup_work
);
606 struct usb_serial_port
*port
= priv
->dp_port
;
610 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
611 digi_wakeup_write( port
);
612 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
615 static void digi_wakeup_write( struct usb_serial_port
*port
)
618 struct tty_struct
*tty
= port
->tty
;
621 /* wake up port processes */
622 wake_up_interruptible( &port
->write_wait
);
624 /* wake up line discipline */
630 * Digi Write OOB Command
632 * Write commands on the out of band port. Commands are 4
633 * bytes each, multiple commands can be sent at once, and
634 * no command will be split across USB packets. Returns 0
635 * if successful, -EINTR if interrupted while sleeping and
636 * the interruptible flag is true, or a negative error
637 * returned by usb_submit_urb.
640 static int digi_write_oob_command( struct usb_serial_port
*port
,
641 unsigned char *buf
, int count
, int interruptible
)
646 struct usb_serial_port
*oob_port
= (struct usb_serial_port
*)((struct digi_serial
*)(usb_get_serial_data(port
->serial
)))->ds_oob_port
;
647 struct digi_port
*oob_priv
= usb_get_serial_port_data(oob_port
);
648 unsigned long flags
= 0;
651 dbg( "digi_write_oob_command: TOP: port=%d, count=%d", oob_priv
->dp_port_num
, count
);
653 spin_lock_irqsave( &oob_priv
->dp_port_lock
, flags
);
657 while( oob_port
->write_urb
->status
== -EINPROGRESS
658 || oob_priv
->dp_write_urb_in_use
) {
659 cond_wait_interruptible_timeout_irqrestore(
660 &oob_port
->write_wait
, DIGI_RETRY_TIMEOUT
,
661 &oob_priv
->dp_port_lock
, flags
);
662 if( interruptible
&& signal_pending(current
) ) {
665 spin_lock_irqsave( &oob_priv
->dp_port_lock
, flags
);
668 /* len must be a multiple of 4, so commands are not split */
669 len
= min(count
, oob_port
->bulk_out_size
);
673 memcpy( oob_port
->write_urb
->transfer_buffer
, buf
, len
);
674 oob_port
->write_urb
->transfer_buffer_length
= len
;
675 oob_port
->write_urb
->dev
= port
->serial
->dev
;
677 if( (ret
=usb_submit_urb(oob_port
->write_urb
, GFP_ATOMIC
)) == 0 ) {
678 oob_priv
->dp_write_urb_in_use
= 1;
685 spin_unlock_irqrestore( &oob_priv
->dp_port_lock
, flags
);
688 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__
,
698 * Digi Write In Band Command
700 * Write commands on the given port. Commands are 4
701 * bytes each, multiple commands can be sent at once, and
702 * no command will be split across USB packets. If timeout
703 * is non-zero, write in band command will return after
704 * waiting unsuccessfully for the URB status to clear for
705 * timeout ticks. Returns 0 if successful, or a negative
706 * error returned by digi_write.
709 static int digi_write_inb_command( struct usb_serial_port
*port
,
710 unsigned char *buf
, int count
, unsigned long timeout
)
715 struct digi_port
*priv
= usb_get_serial_port_data(port
);
716 unsigned char *data
= port
->write_urb
->transfer_buffer
;
717 unsigned long flags
= 0;
720 dbg( "digi_write_inb_command: TOP: port=%d, count=%d", priv
->dp_port_num
,
728 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
730 while( count
> 0 && ret
== 0 ) {
732 while( (port
->write_urb
->status
== -EINPROGRESS
733 || priv
->dp_write_urb_in_use
) && time_before(jiffies
, timeout
)) {
734 cond_wait_interruptible_timeout_irqrestore(
735 &port
->write_wait
, DIGI_RETRY_TIMEOUT
,
736 &priv
->dp_port_lock
, flags
);
737 if( signal_pending(current
) ) {
740 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
743 /* len must be a multiple of 4 and small enough to */
744 /* guarantee the write will send buffered data first, */
745 /* so commands are in order with data and not split */
746 len
= min(count
, port
->bulk_out_size
-2-priv
->dp_out_buf_len
);
750 /* write any buffered data first */
751 if( priv
->dp_out_buf_len
> 0 ) {
752 data
[0] = DIGI_CMD_SEND_DATA
;
753 data
[1] = priv
->dp_out_buf_len
;
754 memcpy( data
+2, priv
->dp_out_buf
,
755 priv
->dp_out_buf_len
);
756 memcpy( data
+2+priv
->dp_out_buf_len
, buf
, len
);
757 port
->write_urb
->transfer_buffer_length
758 = priv
->dp_out_buf_len
+2+len
;
760 memcpy( data
, buf
, len
);
761 port
->write_urb
->transfer_buffer_length
= len
;
763 port
->write_urb
->dev
= port
->serial
->dev
;
765 if( (ret
=usb_submit_urb(port
->write_urb
, GFP_ATOMIC
)) == 0 ) {
766 priv
->dp_write_urb_in_use
= 1;
767 priv
->dp_out_buf_len
= 0;
774 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
777 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__
,
778 ret
, priv
->dp_port_num
);
787 * Digi Set Modem Signals
789 * Sets or clears DTR and RTS on the port, according to the
790 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
791 * for the modem_signals argument. Returns 0 if successful,
792 * -EINTR if interrupted while sleeping, or a non-zero error
793 * returned by usb_submit_urb.
796 static int digi_set_modem_signals( struct usb_serial_port
*port
,
797 unsigned int modem_signals
, int interruptible
)
801 struct digi_port
*port_priv
= usb_get_serial_port_data(port
);
802 struct usb_serial_port
*oob_port
= (struct usb_serial_port
*)((struct digi_serial
*)(usb_get_serial_data(port
->serial
)))->ds_oob_port
;
803 struct digi_port
*oob_priv
= usb_get_serial_port_data(oob_port
);
804 unsigned char *data
= oob_port
->write_urb
->transfer_buffer
;
805 unsigned long flags
= 0;
808 dbg( "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
809 port_priv
->dp_port_num
, modem_signals
);
811 spin_lock_irqsave( &oob_priv
->dp_port_lock
, flags
);
812 spin_lock( &port_priv
->dp_port_lock
);
814 while( oob_port
->write_urb
->status
== -EINPROGRESS
815 || oob_priv
->dp_write_urb_in_use
) {
816 spin_unlock( &port_priv
->dp_port_lock
);
817 cond_wait_interruptible_timeout_irqrestore(
818 &oob_port
->write_wait
, DIGI_RETRY_TIMEOUT
,
819 &oob_priv
->dp_port_lock
, flags
);
820 if( interruptible
&& signal_pending(current
) ) {
823 spin_lock_irqsave( &oob_priv
->dp_port_lock
, flags
);
824 spin_lock( &port_priv
->dp_port_lock
);
827 data
[0] = DIGI_CMD_SET_DTR_SIGNAL
;
828 data
[1] = port_priv
->dp_port_num
;
829 data
[2] = (modem_signals
&TIOCM_DTR
) ?
830 DIGI_DTR_ACTIVE
: DIGI_DTR_INACTIVE
;
833 data
[4] = DIGI_CMD_SET_RTS_SIGNAL
;
834 data
[5] = port_priv
->dp_port_num
;
835 data
[6] = (modem_signals
&TIOCM_RTS
) ?
836 DIGI_RTS_ACTIVE
: DIGI_RTS_INACTIVE
;
839 oob_port
->write_urb
->transfer_buffer_length
= 8;
840 oob_port
->write_urb
->dev
= port
->serial
->dev
;
842 if( (ret
=usb_submit_urb(oob_port
->write_urb
, GFP_ATOMIC
)) == 0 ) {
843 oob_priv
->dp_write_urb_in_use
= 1;
844 port_priv
->dp_modem_signals
=
845 (port_priv
->dp_modem_signals
&~(TIOCM_DTR
|TIOCM_RTS
))
846 | (modem_signals
&(TIOCM_DTR
|TIOCM_RTS
));
849 spin_unlock( &port_priv
->dp_port_lock
);
850 spin_unlock_irqrestore( &oob_priv
->dp_port_lock
, flags
);
853 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__
,
865 * Digi transmit idle waits, up to timeout ticks, for the transmitter
866 * to go idle. It returns 0 if successful or a negative error.
868 * There are race conditions here if more than one process is calling
869 * digi_transmit_idle on the same port at the same time. However, this
870 * is only called from close, and only one process can be in close on a
871 * port at a time, so its ok.
874 static int digi_transmit_idle( struct usb_serial_port
*port
,
875 unsigned long timeout
)
879 unsigned char buf
[2];
880 struct digi_port
*priv
= usb_get_serial_port_data(port
);
881 unsigned long flags
= 0;
884 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
885 priv
->dp_transmit_idle
= 0;
886 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
888 buf
[0] = DIGI_CMD_TRANSMIT_IDLE
;
893 if( (ret
=digi_write_inb_command( port
, buf
, 2, timeout
-jiffies
)) != 0 )
896 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
898 while( time_before(jiffies
, timeout
) && !priv
->dp_transmit_idle
) {
899 cond_wait_interruptible_timeout_irqrestore(
900 &priv
->dp_transmit_idle_wait
, DIGI_RETRY_TIMEOUT
,
901 &priv
->dp_port_lock
, flags
);
902 if( signal_pending(current
) ) {
905 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
908 priv
->dp_transmit_idle
= 0;
909 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
916 static void digi_rx_throttle( struct usb_serial_port
*port
)
920 struct digi_port
*priv
= usb_get_serial_port_data(port
);
923 dbg( "digi_rx_throttle: TOP: port=%d", priv
->dp_port_num
);
925 /* stop receiving characters by not resubmitting the read urb */
926 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
927 priv
->dp_throttled
= 1;
928 priv
->dp_throttle_restart
= 0;
929 priv
->dp_in_buf_len
= 0;
930 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
935 static void digi_rx_unthrottle( struct usb_serial_port
*port
)
941 struct digi_port
*priv
= usb_get_serial_port_data(port
);
942 struct tty_struct
*tty
= port
->tty
;
945 dbg( "digi_rx_unthrottle: TOP: port=%d", priv
->dp_port_num
);
947 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
949 /* send any buffered chars from throttle time on to tty subsystem */
951 len
= tty_buffer_request_room(tty
, priv
->dp_in_buf_len
);
953 tty_insert_flip_string_flags(tty
, priv
->dp_in_buf
, priv
->dp_in_flag_buf
, len
);
954 tty_flip_buffer_push( tty
);
957 /* restart read chain */
958 if( priv
->dp_throttle_restart
) {
959 port
->read_urb
->dev
= port
->serial
->dev
;
960 ret
= usb_submit_urb( port
->read_urb
, GFP_ATOMIC
);
963 /* turn throttle off */
964 priv
->dp_throttled
= 0;
965 priv
->dp_in_buf_len
= 0;
966 priv
->dp_throttle_restart
= 0;
968 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
971 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__
,
972 ret
, priv
->dp_port_num
);
978 static void digi_set_termios( struct usb_serial_port
*port
,
979 struct ktermios
*old_termios
)
982 struct digi_port
*priv
= usb_get_serial_port_data(port
);
983 unsigned int iflag
= port
->tty
->termios
->c_iflag
;
984 unsigned int cflag
= port
->tty
->termios
->c_cflag
;
985 unsigned int old_iflag
= old_termios
->c_iflag
;
986 unsigned int old_cflag
= old_termios
->c_cflag
;
987 unsigned char buf
[32];
988 unsigned int modem_signals
;
993 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
);
996 if( (cflag
&CBAUD
) != (old_cflag
&CBAUD
) ) {
1000 /* reassert DTR and (maybe) RTS on transition from B0 */
1001 if( (old_cflag
&CBAUD
) == B0
) {
1002 /* don't set RTS if using hardware flow control */
1003 /* and throttling input */
1004 modem_signals
= TIOCM_DTR
;
1005 if( !(port
->tty
->termios
->c_cflag
& CRTSCTS
) ||
1006 !test_bit(TTY_THROTTLED
, &port
->tty
->flags
) ) {
1007 modem_signals
|= TIOCM_RTS
;
1009 digi_set_modem_signals( port
, modem_signals
, 1 );
1012 switch( (cflag
&CBAUD
) ) {
1013 /* drop DTR and RTS on transition to B0 */
1014 case B0
: digi_set_modem_signals( port
, 0, 1 ); break;
1015 case B50
: arg
= DIGI_BAUD_50
; break;
1016 case B75
: arg
= DIGI_BAUD_75
; break;
1017 case B110
: arg
= DIGI_BAUD_110
; break;
1018 case B150
: arg
= DIGI_BAUD_150
; break;
1019 case B200
: arg
= DIGI_BAUD_200
; break;
1020 case B300
: arg
= DIGI_BAUD_300
; break;
1021 case B600
: arg
= DIGI_BAUD_600
; break;
1022 case B1200
: arg
= DIGI_BAUD_1200
; break;
1023 case B1800
: arg
= DIGI_BAUD_1800
; break;
1024 case B2400
: arg
= DIGI_BAUD_2400
; break;
1025 case B4800
: arg
= DIGI_BAUD_4800
; break;
1026 case B9600
: arg
= DIGI_BAUD_9600
; break;
1027 case B19200
: arg
= DIGI_BAUD_19200
; break;
1028 case B38400
: arg
= DIGI_BAUD_38400
; break;
1029 case B57600
: arg
= DIGI_BAUD_57600
; break;
1030 case B115200
: arg
= DIGI_BAUD_115200
; break;
1031 case B230400
: arg
= DIGI_BAUD_230400
; break;
1032 case B460800
: arg
= DIGI_BAUD_460800
; break;
1034 dbg( "digi_set_termios: can't handle baud rate 0x%x",
1040 buf
[i
++] = DIGI_CMD_SET_BAUD_RATE
;
1041 buf
[i
++] = priv
->dp_port_num
;
1049 if( (cflag
&(PARENB
|PARODD
)) != (old_cflag
&(PARENB
|PARODD
)) ) {
1051 if( (cflag
&PARENB
) ) {
1052 if( (cflag
&PARODD
) )
1053 arg
= DIGI_PARITY_ODD
;
1055 arg
= DIGI_PARITY_EVEN
;
1057 arg
= DIGI_PARITY_NONE
;
1060 buf
[i
++] = DIGI_CMD_SET_PARITY
;
1061 buf
[i
++] = priv
->dp_port_num
;
1068 if( (cflag
&CSIZE
) != (old_cflag
&CSIZE
) ) {
1072 switch( (cflag
&CSIZE
) ) {
1073 case CS5
: arg
= DIGI_WORD_SIZE_5
; break;
1074 case CS6
: arg
= DIGI_WORD_SIZE_6
; break;
1075 case CS7
: arg
= DIGI_WORD_SIZE_7
; break;
1076 case CS8
: arg
= DIGI_WORD_SIZE_8
; break;
1078 dbg( "digi_set_termios: can't handle word size %d",
1084 buf
[i
++] = DIGI_CMD_SET_WORD_SIZE
;
1085 buf
[i
++] = priv
->dp_port_num
;
1093 if( (cflag
&CSTOPB
) != (old_cflag
&CSTOPB
) ) {
1095 if( (cflag
&CSTOPB
) )
1096 arg
= DIGI_STOP_BITS_2
;
1098 arg
= DIGI_STOP_BITS_1
;
1100 buf
[i
++] = DIGI_CMD_SET_STOP_BITS
;
1101 buf
[i
++] = priv
->dp_port_num
;
1107 /* set input flow control */
1108 if( (iflag
&IXOFF
) != (old_iflag
&IXOFF
)
1109 || (cflag
&CRTSCTS
) != (old_cflag
&CRTSCTS
) ) {
1114 arg
|= DIGI_INPUT_FLOW_CONTROL_XON_XOFF
;
1116 arg
&= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF
;
1118 if( (cflag
&CRTSCTS
) ) {
1120 arg
|= DIGI_INPUT_FLOW_CONTROL_RTS
;
1122 /* On USB-4 it is necessary to assert RTS prior */
1123 /* to selecting RTS input flow control. */
1124 buf
[i
++] = DIGI_CMD_SET_RTS_SIGNAL
;
1125 buf
[i
++] = priv
->dp_port_num
;
1126 buf
[i
++] = DIGI_RTS_ACTIVE
;
1130 arg
&= ~DIGI_INPUT_FLOW_CONTROL_RTS
;
1133 buf
[i
++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL
;
1134 buf
[i
++] = priv
->dp_port_num
;
1140 /* set output flow control */
1141 if( (iflag
&IXON
) != (old_iflag
&IXON
)
1142 || (cflag
&CRTSCTS
) != (old_cflag
&CRTSCTS
) ) {
1147 arg
|= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF
;
1149 arg
&= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF
;
1151 if( (cflag
&CRTSCTS
) ) {
1152 arg
|= DIGI_OUTPUT_FLOW_CONTROL_CTS
;
1154 arg
&= ~DIGI_OUTPUT_FLOW_CONTROL_CTS
;
1155 port
->tty
->hw_stopped
= 0;
1158 buf
[i
++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL
;
1159 buf
[i
++] = priv
->dp_port_num
;
1165 /* set receive enable/disable */
1166 if( (cflag
&CREAD
) != (old_cflag
&CREAD
) ) {
1173 buf
[i
++] = DIGI_CMD_RECEIVE_ENABLE
;
1174 buf
[i
++] = priv
->dp_port_num
;
1180 if( (ret
=digi_write_oob_command( port
, buf
, i
, 1 )) != 0 )
1181 dbg( "digi_set_termios: write oob failed, ret=%d", ret
);
1186 static void digi_break_ctl( struct usb_serial_port
*port
, int break_state
)
1189 unsigned char buf
[4];
1192 buf
[0] = DIGI_CMD_BREAK_CONTROL
;
1193 buf
[1] = 2; /* length */
1194 buf
[2] = break_state
? 1 : 0;
1195 buf
[3] = 0; /* pad */
1197 digi_write_inb_command( port
, buf
, 4, 0 );
1202 static int digi_tiocmget( struct usb_serial_port
*port
, struct file
*file
)
1204 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1206 unsigned long flags
;
1208 dbg("%s: TOP: port=%d", __FUNCTION__
, priv
->dp_port_num
);
1210 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
1211 val
= priv
->dp_modem_signals
;
1212 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
1217 static int digi_tiocmset( struct usb_serial_port
*port
, struct file
*file
,
1218 unsigned int set
, unsigned int clear
)
1220 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1222 unsigned long flags
;
1224 dbg("%s: TOP: port=%d", __FUNCTION__
, priv
->dp_port_num
);
1226 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
1227 val
= (priv
->dp_modem_signals
& ~clear
) | set
;
1228 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
1229 return digi_set_modem_signals( port
, val
, 1 );
1233 static int digi_ioctl( struct usb_serial_port
*port
, struct file
*file
,
1234 unsigned int cmd
, unsigned long arg
)
1237 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1239 dbg( "digi_ioctl: TOP: port=%d, cmd=0x%x", priv
->dp_port_num
, cmd
);
1244 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
1249 /* return count of modemline transitions */
1255 return( -ENOIOCTLCMD
);
1260 static int digi_write( struct usb_serial_port
*port
, const unsigned char *buf
, int count
)
1263 int ret
,data_len
,new_len
;
1264 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1265 unsigned char *data
= port
->write_urb
->transfer_buffer
;
1266 unsigned long flags
= 0;
1269 dbg( "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld",
1270 priv
->dp_port_num
, count
, in_interrupt() );
1272 /* copy user data (which can sleep) before getting spin lock */
1273 count
= min( count
, port
->bulk_out_size
-2 );
1274 count
= min( 64, count
);
1276 /* be sure only one write proceeds at a time */
1277 /* there are races on the port private buffer */
1278 /* and races to check write_urb->status */
1279 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
1281 /* wait for urb status clear to submit another urb */
1282 if( port
->write_urb
->status
== -EINPROGRESS
1283 || priv
->dp_write_urb_in_use
) {
1285 /* buffer data if count is 1 (probably put_char) if possible */
1286 if( count
== 1 && priv
->dp_out_buf_len
< DIGI_OUT_BUF_SIZE
) {
1287 priv
->dp_out_buf
[priv
->dp_out_buf_len
++] = *buf
;
1293 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
1299 /* allow space for any buffered data and for new data, up to */
1300 /* transfer buffer size - 2 (for command and length bytes) */
1301 new_len
= min(count
, port
->bulk_out_size
-2-priv
->dp_out_buf_len
);
1302 data_len
= new_len
+ priv
->dp_out_buf_len
;
1304 if( data_len
== 0 ) {
1305 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
1309 port
->write_urb
->transfer_buffer_length
= data_len
+2;
1310 port
->write_urb
->dev
= port
->serial
->dev
;
1312 *data
++ = DIGI_CMD_SEND_DATA
;
1315 /* copy in buffered data first */
1316 memcpy( data
, priv
->dp_out_buf
, priv
->dp_out_buf_len
);
1317 data
+= priv
->dp_out_buf_len
;
1319 /* copy in new data */
1320 memcpy( data
, buf
, new_len
);
1322 if( (ret
=usb_submit_urb(port
->write_urb
, GFP_ATOMIC
)) == 0 ) {
1323 priv
->dp_write_urb_in_use
= 1;
1325 priv
->dp_out_buf_len
= 0;
1328 /* return length of new data written, or error */
1329 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
1331 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__
,
1332 ret
, priv
->dp_port_num
);
1335 dbg( "digi_write: returning %d", ret
);
1341 static void digi_write_bulk_callback( struct urb
*urb
)
1344 struct usb_serial_port
*port
= (struct usb_serial_port
*)urb
->context
;
1345 struct usb_serial
*serial
;
1346 struct digi_port
*priv
;
1347 struct digi_serial
*serial_priv
;
1351 dbg( "digi_write_bulk_callback: TOP, urb->status=%d", urb
->status
);
1353 /* port and serial sanity check */
1354 if( port
== NULL
|| (priv
=usb_get_serial_port_data(port
)) == NULL
) {
1355 err("%s: port or port->private is NULL, status=%d", __FUNCTION__
,
1359 serial
= port
->serial
;
1360 if( serial
== NULL
|| (serial_priv
=usb_get_serial_data(serial
)) == NULL
) {
1361 err("%s: serial or serial->private is NULL, status=%d", __FUNCTION__
, urb
->status
);
1365 /* handle oob callback */
1366 if( priv
->dp_port_num
== serial_priv
->ds_oob_port_num
) {
1367 dbg( "digi_write_bulk_callback: oob callback" );
1368 spin_lock( &priv
->dp_port_lock
);
1369 priv
->dp_write_urb_in_use
= 0;
1370 wake_up_interruptible( &port
->write_wait
);
1371 spin_unlock( &priv
->dp_port_lock
);
1375 /* try to send any buffered data on this port, if it is open */
1376 spin_lock( &priv
->dp_port_lock
);
1377 priv
->dp_write_urb_in_use
= 0;
1378 if( port
->open_count
&& port
->write_urb
->status
!= -EINPROGRESS
1379 && priv
->dp_out_buf_len
> 0 ) {
1381 *((unsigned char *)(port
->write_urb
->transfer_buffer
))
1382 = (unsigned char)DIGI_CMD_SEND_DATA
;
1383 *((unsigned char *)(port
->write_urb
->transfer_buffer
)+1)
1384 = (unsigned char)priv
->dp_out_buf_len
;
1386 port
->write_urb
->transfer_buffer_length
1387 = priv
->dp_out_buf_len
+2;
1388 port
->write_urb
->dev
= serial
->dev
;
1390 memcpy( port
->write_urb
->transfer_buffer
+2, priv
->dp_out_buf
,
1391 priv
->dp_out_buf_len
);
1393 if( (ret
=usb_submit_urb(port
->write_urb
, GFP_ATOMIC
)) == 0 ) {
1394 priv
->dp_write_urb_in_use
= 1;
1395 priv
->dp_out_buf_len
= 0;
1400 /* wake up processes sleeping on writes immediately */
1401 digi_wakeup_write( port
);
1403 /* also queue up a wakeup at scheduler time, in case we */
1404 /* lost the race in write_chan(). */
1405 schedule_work(&priv
->dp_wakeup_work
);
1407 spin_unlock( &priv
->dp_port_lock
);
1410 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__
,
1411 ret
, priv
->dp_port_num
);
1417 static int digi_write_room( struct usb_serial_port
*port
)
1421 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1422 unsigned long flags
= 0;
1425 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
1427 if( port
->write_urb
->status
== -EINPROGRESS
1428 || priv
->dp_write_urb_in_use
)
1431 room
= port
->bulk_out_size
- 2 - priv
->dp_out_buf_len
;
1433 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
1435 dbg( "digi_write_room: port=%d, room=%d", priv
->dp_port_num
, room
);
1441 static int digi_chars_in_buffer( struct usb_serial_port
*port
)
1444 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1447 if( port
->write_urb
->status
== -EINPROGRESS
1448 || priv
->dp_write_urb_in_use
) {
1449 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv
->dp_port_num
, port
->bulk_out_size
- 2 );
1450 /* return( port->bulk_out_size - 2 ); */
1453 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv
->dp_port_num
, priv
->dp_out_buf_len
);
1454 return( priv
->dp_out_buf_len
);
1460 static int digi_open( struct usb_serial_port
*port
, struct file
*filp
)
1464 unsigned char buf
[32];
1465 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1466 struct ktermios not_termios
;
1467 unsigned long flags
= 0;
1470 dbg( "digi_open: TOP: port=%d, open_count=%d", priv
->dp_port_num
, port
->open_count
);
1472 /* be sure the device is started up */
1473 if( digi_startup_device( port
->serial
) != 0 )
1476 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
1478 /* don't wait on a close in progress for non-blocking opens */
1479 if( priv
->dp_in_close
&& (filp
->f_flags
&(O_NDELAY
|O_NONBLOCK
)) == 0 ) {
1480 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
1484 /* wait for a close in progress to finish */
1485 while( priv
->dp_in_close
) {
1486 cond_wait_interruptible_timeout_irqrestore(
1487 &priv
->dp_close_wait
, DIGI_RETRY_TIMEOUT
,
1488 &priv
->dp_port_lock
, flags
);
1489 if( signal_pending(current
) ) {
1492 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
1495 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
1497 /* read modem signals automatically whenever they change */
1498 buf
[0] = DIGI_CMD_READ_INPUT_SIGNALS
;
1499 buf
[1] = priv
->dp_port_num
;
1500 buf
[2] = DIGI_ENABLE
;
1504 buf
[4] = DIGI_CMD_IFLUSH_FIFO
;
1505 buf
[5] = priv
->dp_port_num
;
1506 buf
[6] = DIGI_FLUSH_TX
| DIGI_FLUSH_RX
;
1509 if( (ret
=digi_write_oob_command( port
, buf
, 8, 1 )) != 0 )
1510 dbg( "digi_open: write oob failed, ret=%d", ret
);
1512 /* set termios settings */
1513 not_termios
.c_cflag
= ~port
->tty
->termios
->c_cflag
;
1514 not_termios
.c_iflag
= ~port
->tty
->termios
->c_iflag
;
1515 digi_set_termios( port
, ¬_termios
);
1517 /* set DTR and RTS */
1518 digi_set_modem_signals( port
, TIOCM_DTR
|TIOCM_RTS
, 1 );
1525 static void digi_close( struct usb_serial_port
*port
, struct file
*filp
)
1529 unsigned char buf
[32];
1530 struct tty_struct
*tty
= port
->tty
;
1531 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1532 unsigned long flags
= 0;
1535 dbg( "digi_close: TOP: port=%d, open_count=%d", priv
->dp_port_num
, port
->open_count
);
1538 /* if disconnected, just clear flags */
1539 if (!usb_get_intfdata(port
->serial
->interface
))
1542 /* do cleanup only after final close on this port */
1543 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
1544 priv
->dp_in_close
= 1;
1545 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
1547 /* tell line discipline to process only XON/XOFF */
1550 /* wait for output to drain */
1551 if( (filp
->f_flags
&(O_NDELAY
|O_NONBLOCK
)) == 0 ) {
1552 tty_wait_until_sent( tty
, DIGI_CLOSE_TIMEOUT
);
1555 /* flush driver and line discipline buffers */
1556 if( tty
->driver
->flush_buffer
)
1557 tty
->driver
->flush_buffer( tty
);
1558 tty_ldisc_flush(tty
);
1560 if (port
->serial
->dev
) {
1561 /* wait for transmit idle */
1562 if( (filp
->f_flags
&(O_NDELAY
|O_NONBLOCK
)) == 0 ) {
1563 digi_transmit_idle( port
, DIGI_CLOSE_TIMEOUT
);
1566 /* drop DTR and RTS */
1567 digi_set_modem_signals( port
, 0, 0 );
1569 /* disable input flow control */
1570 buf
[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL
;
1571 buf
[1] = priv
->dp_port_num
;
1572 buf
[2] = DIGI_DISABLE
;
1575 /* disable output flow control */
1576 buf
[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL
;
1577 buf
[5] = priv
->dp_port_num
;
1578 buf
[6] = DIGI_DISABLE
;
1581 /* disable reading modem signals automatically */
1582 buf
[8] = DIGI_CMD_READ_INPUT_SIGNALS
;
1583 buf
[9] = priv
->dp_port_num
;
1584 buf
[10] = DIGI_DISABLE
;
1587 /* disable receive */
1588 buf
[12] = DIGI_CMD_RECEIVE_ENABLE
;
1589 buf
[13] = priv
->dp_port_num
;
1590 buf
[14] = DIGI_DISABLE
;
1594 buf
[16] = DIGI_CMD_IFLUSH_FIFO
;
1595 buf
[17] = priv
->dp_port_num
;
1596 buf
[18] = DIGI_FLUSH_TX
| DIGI_FLUSH_RX
;
1599 if( (ret
=digi_write_oob_command( port
, buf
, 20, 0 )) != 0 )
1600 dbg( "digi_close: write oob failed, ret=%d", ret
);
1602 /* wait for final commands on oob port to complete */
1603 prepare_to_wait(&priv
->dp_flush_wait
, &wait
, TASK_INTERRUPTIBLE
);
1604 schedule_timeout(DIGI_CLOSE_TIMEOUT
);
1605 finish_wait(&priv
->dp_flush_wait
, &wait
);
1607 /* shutdown any outstanding bulk writes */
1608 usb_kill_urb(port
->write_urb
);
1614 spin_lock_irqsave( &priv
->dp_port_lock
, flags
);
1615 priv
->dp_write_urb_in_use
= 0;
1616 priv
->dp_in_close
= 0;
1617 wake_up_interruptible( &priv
->dp_close_wait
);
1618 spin_unlock_irqrestore( &priv
->dp_port_lock
, flags
);
1620 dbg( "digi_close: done" );
1625 * Digi Startup Device
1627 * Starts reads on all ports. Must be called AFTER startup, with
1628 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1631 static int digi_startup_device( struct usb_serial
*serial
)
1635 struct digi_serial
*serial_priv
= usb_get_serial_data(serial
);
1636 struct usb_serial_port
*port
;
1639 /* be sure this happens exactly once */
1640 spin_lock( &serial_priv
->ds_serial_lock
);
1641 if( serial_priv
->ds_device_started
) {
1642 spin_unlock( &serial_priv
->ds_serial_lock
);
1645 serial_priv
->ds_device_started
= 1;
1646 spin_unlock( &serial_priv
->ds_serial_lock
);
1648 /* start reading from each bulk in endpoint for the device */
1649 /* set USB_DISABLE_SPD flag for write bulk urbs */
1650 for( i
=0; i
<serial
->type
->num_ports
+1; i
++ ) {
1652 port
= serial
->port
[i
];
1654 port
->write_urb
->dev
= port
->serial
->dev
;
1656 if( (ret
=usb_submit_urb(port
->read_urb
, GFP_KERNEL
)) != 0 ) {
1657 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__
,
1669 static int digi_startup( struct usb_serial
*serial
)
1673 struct digi_port
*priv
;
1674 struct digi_serial
*serial_priv
;
1677 dbg( "digi_startup: TOP" );
1679 /* allocate the private data structures for all ports */
1680 /* number of regular ports + 1 for the out-of-band port */
1681 for( i
=0; i
<serial
->type
->num_ports
+1; i
++ ) {
1683 /* allocate port private structure */
1684 priv
= (struct digi_port
*)kmalloc( sizeof(struct digi_port
),
1686 if( priv
== (struct digi_port
*)0 ) {
1688 kfree( usb_get_serial_port_data(serial
->port
[i
]) );
1689 return( 1 ); /* error */
1692 /* initialize port private structure */
1693 spin_lock_init( &priv
->dp_port_lock
);
1694 priv
->dp_port_num
= i
;
1695 priv
->dp_out_buf_len
= 0;
1696 priv
->dp_in_buf_len
= 0;
1697 priv
->dp_write_urb_in_use
= 0;
1698 priv
->dp_modem_signals
= 0;
1699 init_waitqueue_head( &priv
->dp_modem_change_wait
);
1700 priv
->dp_transmit_idle
= 0;
1701 init_waitqueue_head( &priv
->dp_transmit_idle_wait
);
1702 priv
->dp_throttled
= 0;
1703 priv
->dp_throttle_restart
= 0;
1704 init_waitqueue_head( &priv
->dp_flush_wait
);
1705 priv
->dp_in_close
= 0;
1706 init_waitqueue_head( &priv
->dp_close_wait
);
1707 INIT_WORK(&priv
->dp_wakeup_work
, digi_wakeup_write_lock
);
1708 priv
->dp_port
= serial
->port
[i
];
1710 /* initialize write wait queue for this port */
1711 init_waitqueue_head( &serial
->port
[i
]->write_wait
);
1713 usb_set_serial_port_data(serial
->port
[i
], priv
);
1716 /* allocate serial private structure */
1717 serial_priv
= (struct digi_serial
*)kmalloc( sizeof(struct digi_serial
),
1719 if( serial_priv
== (struct digi_serial
*)0 ) {
1720 for( i
=0; i
<serial
->type
->num_ports
+1; i
++ )
1721 kfree( usb_get_serial_port_data(serial
->port
[i
]) );
1722 return( 1 ); /* error */
1725 /* initialize serial private structure */
1726 spin_lock_init( &serial_priv
->ds_serial_lock
);
1727 serial_priv
->ds_oob_port_num
= serial
->type
->num_ports
;
1728 serial_priv
->ds_oob_port
= serial
->port
[serial_priv
->ds_oob_port_num
];
1729 serial_priv
->ds_device_started
= 0;
1730 usb_set_serial_data(serial
, serial_priv
);
1737 static void digi_shutdown( struct usb_serial
*serial
)
1743 dbg( "digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt() );
1745 /* stop reads and writes on all ports */
1746 for( i
=0; i
<serial
->type
->num_ports
+1; i
++ ) {
1747 usb_kill_urb(serial
->port
[i
]->read_urb
);
1748 usb_kill_urb(serial
->port
[i
]->write_urb
);
1751 /* free the private data structures for all ports */
1752 /* number of regular ports + 1 for the out-of-band port */
1753 for( i
=0; i
<serial
->type
->num_ports
+1; i
++ )
1754 kfree( usb_get_serial_port_data(serial
->port
[i
]) );
1755 kfree( usb_get_serial_data(serial
) );
1759 static void digi_read_bulk_callback( struct urb
*urb
)
1762 struct usb_serial_port
*port
= (struct usb_serial_port
*)urb
->context
;
1763 struct digi_port
*priv
;
1764 struct digi_serial
*serial_priv
;
1768 dbg( "digi_read_bulk_callback: TOP" );
1770 /* port sanity check, do not resubmit if port is not valid */
1771 if( port
== NULL
|| (priv
=usb_get_serial_port_data(port
)) == NULL
) {
1772 err("%s: port or port->private is NULL, status=%d", __FUNCTION__
,
1776 if( port
->serial
== NULL
1777 || (serial_priv
=usb_get_serial_data(port
->serial
)) == NULL
) {
1778 err("%s: serial is bad or serial->private is NULL, status=%d", __FUNCTION__
, urb
->status
);
1782 /* do not resubmit urb if it has any status error */
1784 err("%s: nonzero read bulk status: status=%d, port=%d", __FUNCTION__
, urb
->status
, priv
->dp_port_num
);
1788 /* handle oob or inb callback, do not resubmit if error */
1789 if( priv
->dp_port_num
== serial_priv
->ds_oob_port_num
) {
1790 if( digi_read_oob_callback( urb
) != 0 )
1793 if( digi_read_inb_callback( urb
) != 0 )
1798 urb
->dev
= port
->serial
->dev
;
1799 if( (ret
=usb_submit_urb(urb
, GFP_ATOMIC
)) != 0 ) {
1800 err("%s: failed resubmitting urb, ret=%d, port=%d", __FUNCTION__
,
1801 ret
, priv
->dp_port_num
);
1808 * Digi Read INB Callback
1810 * Digi Read INB Callback handles reads on the in band ports, sending
1811 * the data on to the tty subsystem. When called we know port and
1812 * port->private are not NULL and port->serial has been validated.
1813 * It returns 0 if successful, 1 if successful but the port is
1814 * throttled, and -1 if the sanity checks failed.
1817 static int digi_read_inb_callback( struct urb
*urb
)
1820 struct usb_serial_port
*port
= (struct usb_serial_port
*)urb
->context
;
1821 struct tty_struct
*tty
= port
->tty
;
1822 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1823 int opcode
= ((unsigned char *)urb
->transfer_buffer
)[0];
1824 int len
= ((unsigned char *)urb
->transfer_buffer
)[1];
1825 int status
= ((unsigned char *)urb
->transfer_buffer
)[2];
1826 unsigned char *data
= ((unsigned char *)urb
->transfer_buffer
)+3;
1830 /* do not process callbacks on closed ports */
1831 /* but do continue the read chain */
1832 if( port
->open_count
== 0 )
1835 /* short/multiple packet check */
1836 if( urb
->actual_length
!= len
+ 2 ) {
1837 err("%s: INCOMPLETE OR MULTIPLE PACKET, urb->status=%d, port=%d, opcode=%d, len=%d, actual_length=%d, status=%d", __FUNCTION__
, urb
->status
, priv
->dp_port_num
, opcode
, len
, urb
->actual_length
, status
);
1841 spin_lock( &priv
->dp_port_lock
);
1843 /* check for throttle; if set, do not resubmit read urb */
1844 /* indicate the read chain needs to be restarted on unthrottle */
1845 throttled
= priv
->dp_throttled
;
1847 priv
->dp_throttle_restart
= 1;
1850 if( opcode
== DIGI_CMD_RECEIVE_DATA
) {
1852 /* get flag from status */
1855 /* overrun is special, not associated with a char */
1856 if( status
& DIGI_OVERRUN_ERROR
) {
1857 tty_insert_flip_char( tty
, 0, TTY_OVERRUN
);
1860 /* break takes precedence over parity, */
1861 /* which takes precedence over framing errors */
1862 if( status
& DIGI_BREAK_ERROR
) {
1864 } else if( status
& DIGI_PARITY_ERROR
) {
1866 } else if( status
& DIGI_FRAMING_ERROR
) {
1870 /* data length is len-1 (one byte of len is status) */
1876 DIGI_IN_BUF_SIZE
- priv
->dp_in_buf_len
);
1879 memcpy( priv
->dp_in_buf
+ priv
->dp_in_buf_len
,
1881 memset( priv
->dp_in_flag_buf
1882 + priv
->dp_in_buf_len
, flag
, len
);
1883 priv
->dp_in_buf_len
+= len
;
1887 len
= tty_buffer_request_room(tty
, len
);
1890 if(flag
== TTY_NORMAL
)
1891 tty_insert_flip_string(tty
, data
, len
);
1893 for(i
= 0; i
< len
; i
++)
1894 tty_insert_flip_char(tty
, data
[i
], flag
);
1896 tty_flip_buffer_push( tty
);
1901 spin_unlock( &priv
->dp_port_lock
);
1903 if( opcode
== DIGI_CMD_RECEIVE_DISABLE
) {
1904 dbg("%s: got RECEIVE_DISABLE", __FUNCTION__
);
1905 } else if( opcode
!= DIGI_CMD_RECEIVE_DATA
) {
1906 dbg("%s: unknown opcode: %d", __FUNCTION__
, opcode
);
1909 return( throttled
? 1 : 0 );
1915 * Digi Read OOB Callback
1917 * Digi Read OOB Callback handles reads on the out of band port.
1918 * When called we know port and port->private are not NULL and
1919 * the port->serial is valid. It returns 0 if successful, and
1920 * -1 if the sanity checks failed.
1923 static int digi_read_oob_callback( struct urb
*urb
)
1926 struct usb_serial_port
*port
= (struct usb_serial_port
*)urb
->context
;
1927 struct usb_serial
*serial
= port
->serial
;
1928 struct digi_port
*priv
= usb_get_serial_port_data(port
);
1929 int opcode
, line
, status
, val
;
1933 dbg( "digi_read_oob_callback: port=%d, len=%d", priv
->dp_port_num
,
1934 urb
->actual_length
);
1936 /* handle each oob command */
1937 for( i
=0; i
<urb
->actual_length
-3; ) {
1939 opcode
= ((unsigned char *)urb
->transfer_buffer
)[i
++];
1940 line
= ((unsigned char *)urb
->transfer_buffer
)[i
++];
1941 status
= ((unsigned char *)urb
->transfer_buffer
)[i
++];
1942 val
= ((unsigned char *)urb
->transfer_buffer
)[i
++];
1944 dbg( "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1945 opcode
, line
, status
, val
);
1947 if( status
!= 0 || line
>= serial
->type
->num_ports
)
1950 port
= serial
->port
[line
];
1952 if ((priv
=usb_get_serial_port_data(port
)) == NULL
)
1955 if( opcode
== DIGI_CMD_READ_INPUT_SIGNALS
) {
1957 spin_lock( &priv
->dp_port_lock
);
1959 /* convert from digi flags to termiox flags */
1960 if( val
& DIGI_READ_INPUT_SIGNALS_CTS
) {
1961 priv
->dp_modem_signals
|= TIOCM_CTS
;
1962 /* port must be open to use tty struct */
1963 if( port
->open_count
1964 && port
->tty
->termios
->c_cflag
& CRTSCTS
) {
1965 port
->tty
->hw_stopped
= 0;
1966 digi_wakeup_write( port
);
1969 priv
->dp_modem_signals
&= ~TIOCM_CTS
;
1970 /* port must be open to use tty struct */
1971 if( port
->open_count
1972 && port
->tty
->termios
->c_cflag
& CRTSCTS
) {
1973 port
->tty
->hw_stopped
= 1;
1976 if( val
& DIGI_READ_INPUT_SIGNALS_DSR
)
1977 priv
->dp_modem_signals
|= TIOCM_DSR
;
1979 priv
->dp_modem_signals
&= ~TIOCM_DSR
;
1980 if( val
& DIGI_READ_INPUT_SIGNALS_RI
)
1981 priv
->dp_modem_signals
|= TIOCM_RI
;
1983 priv
->dp_modem_signals
&= ~TIOCM_RI
;
1984 if( val
& DIGI_READ_INPUT_SIGNALS_DCD
)
1985 priv
->dp_modem_signals
|= TIOCM_CD
;
1987 priv
->dp_modem_signals
&= ~TIOCM_CD
;
1989 wake_up_interruptible( &priv
->dp_modem_change_wait
);
1990 spin_unlock( &priv
->dp_port_lock
);
1992 } else if( opcode
== DIGI_CMD_TRANSMIT_IDLE
) {
1994 spin_lock( &priv
->dp_port_lock
);
1995 priv
->dp_transmit_idle
= 1;
1996 wake_up_interruptible( &priv
->dp_transmit_idle_wait
);
1997 spin_unlock( &priv
->dp_port_lock
);
1999 } else if( opcode
== DIGI_CMD_IFLUSH_FIFO
) {
2001 wake_up_interruptible( &priv
->dp_flush_wait
);
2012 static int __init
digi_init (void)
2015 retval
= usb_serial_register(&digi_acceleport_2_device
);
2017 goto failed_acceleport_2_device
;
2018 retval
= usb_serial_register(&digi_acceleport_4_device
);
2020 goto failed_acceleport_4_device
;
2021 retval
= usb_register(&digi_driver
);
2023 goto failed_usb_register
;
2024 info(DRIVER_VERSION
":" DRIVER_DESC
);
2026 failed_usb_register
:
2027 usb_serial_deregister(&digi_acceleport_4_device
);
2028 failed_acceleport_4_device
:
2029 usb_serial_deregister(&digi_acceleport_2_device
);
2030 failed_acceleport_2_device
:
2035 static void __exit
digi_exit (void)
2037 usb_deregister (&digi_driver
);
2038 usb_serial_deregister (&digi_acceleport_2_device
);
2039 usb_serial_deregister (&digi_acceleport_4_device
);
2043 module_init(digi_init
);
2044 module_exit(digi_exit
);
2047 MODULE_AUTHOR( DRIVER_AUTHOR
);
2048 MODULE_DESCRIPTION( DRIVER_DESC
);
2049 MODULE_LICENSE("GPL");
2051 module_param(debug
, bool, S_IRUGO
| S_IWUSR
);
2052 MODULE_PARM_DESC(debug
, "Debug enabled or not");