revert-mm-fix-blkdev-size-calculation-in-generic_write_checks
[linux-2.6/linux-trees-mm.git] / drivers / usb / serial / digi_acceleport.c
blobae410c4678ea697abe9f62a435a5aca73f87490e
1 /*
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
12 * usb-serial driver.
14 * Peter Berger (pberger@brimson.com)
15 * Al Borchers (borchers@steinerpoint.com)
17 * (12/03/2001) gkh
18 * switched to using port->open_count instead of private version.
19 * Removed port->active
21 * (04/08/2001) gb
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.
34 * (10/05/2000) gkh
35 * -- Fixed bug with urb->dev not being set properly, now that the usb
36 * core needs it.
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.
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.
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.
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.
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
109 * being scheduled.
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
173 * include that code.
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
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).
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.
206 * Locking and SMP
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.
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>
251 /* Defines */
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 */
279 /* ids */
280 #define DIGI_VENDOR_ID 0x05c5
281 #define DIGI_2_ID 0x0002 /* USB-2 */
282 #define DIGI_4_ID 0x0004 /* USB-4 */
284 /* commands
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 */
311 /* baud rates */
312 #define DIGI_BAUD_50 0
313 #define DIGI_BAUD_75 1
314 #define DIGI_BAUD_110 2
315 #define DIGI_BAUD_150 3
316 #define DIGI_BAUD_200 4
317 #define DIGI_BAUD_300 5
318 #define DIGI_BAUD_600 6
319 #define DIGI_BAUD_1200 7
320 #define DIGI_BAUD_1800 8
321 #define DIGI_BAUD_2400 9
322 #define DIGI_BAUD_4800 10
323 #define DIGI_BAUD_7200 11
324 #define DIGI_BAUD_9600 12
325 #define DIGI_BAUD_14400 13
326 #define DIGI_BAUD_19200 14
327 #define DIGI_BAUD_28800 15
328 #define DIGI_BAUD_38400 16
329 #define DIGI_BAUD_57600 17
330 #define DIGI_BAUD_76800 18
331 #define DIGI_BAUD_115200 19
332 #define DIGI_BAUD_153600 20
333 #define DIGI_BAUD_230400 21
334 #define DIGI_BAUD_460800 22
336 /* arguments */
337 #define DIGI_WORD_SIZE_5 0
338 #define DIGI_WORD_SIZE_6 1
339 #define DIGI_WORD_SIZE_7 2
340 #define DIGI_WORD_SIZE_8 3
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
394 /* input signals */
395 #define DIGI_READ_INPUT_SIGNALS_SLOT 1
396 #define DIGI_READ_INPUT_SIGNALS_ERR 2
397 #define DIGI_READ_INPUT_SIGNALS_BUSY 4
398 #define DIGI_READ_INPUT_SIGNALS_PE 8
399 #define DIGI_READ_INPUT_SIGNALS_CTS 16
400 #define DIGI_READ_INPUT_SIGNALS_DSR 32
401 #define DIGI_READ_INPUT_SIGNALS_RI 64
402 #define DIGI_READ_INPUT_SIGNALS_DCD 128
405 /* Structures */
407 struct digi_serial {
408 spinlock_t ds_serial_lock;
409 struct usb_serial_port *ds_oob_port; /* out-of-band port */
410 int ds_oob_port_num; /* index of out-of-band port */
411 int ds_device_started;
414 struct digi_port {
415 spinlock_t dp_port_lock;
416 int dp_port_num;
417 int dp_out_buf_len;
418 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
419 int dp_write_urb_in_use;
420 unsigned int dp_modem_signals;
421 wait_queue_head_t dp_modem_change_wait;
422 int dp_transmit_idle;
423 wait_queue_head_t dp_transmit_idle_wait;
424 int dp_throttled;
425 int dp_throttle_restart;
426 wait_queue_head_t dp_flush_wait;
427 int dp_in_close; /* close in progress */
428 wait_queue_head_t dp_close_wait; /* wait queue for close */
429 struct work_struct dp_wakeup_work;
430 struct usb_serial_port *dp_port;
434 /* Local Function Declarations */
436 static void digi_wakeup_write(struct usb_serial_port *port);
437 static void digi_wakeup_write_lock(struct work_struct *work);
438 static int digi_write_oob_command(struct usb_serial_port *port,
439 unsigned char *buf, int count, int interruptible);
440 static int digi_write_inb_command(struct usb_serial_port *port,
441 unsigned char *buf, int count, unsigned long timeout);
442 static int digi_set_modem_signals(struct usb_serial_port *port,
443 unsigned int modem_signals, int interruptible);
444 static int digi_transmit_idle(struct usb_serial_port *port,
445 unsigned long timeout);
446 static void digi_rx_throttle (struct usb_serial_port *port);
447 static void digi_rx_unthrottle (struct usb_serial_port *port);
448 static void digi_set_termios(struct usb_serial_port *port,
449 struct ktermios *old_termios);
450 static void digi_break_ctl(struct usb_serial_port *port, int break_state);
451 static int digi_ioctl(struct usb_serial_port *port, struct file *file,
452 unsigned int cmd, unsigned long arg);
453 static int digi_tiocmget(struct usb_serial_port *port, struct file *file);
454 static int digi_tiocmset(struct usb_serial_port *port, struct file *file,
455 unsigned int set, unsigned int clear);
456 static int digi_write(struct usb_serial_port *port, const unsigned char *buf, int count);
457 static void digi_write_bulk_callback(struct urb *urb);
458 static int digi_write_room(struct usb_serial_port *port);
459 static int digi_chars_in_buffer(struct usb_serial_port *port);
460 static int digi_open(struct usb_serial_port *port, struct file *filp);
461 static void digi_close(struct usb_serial_port *port, struct file *filp);
462 static int digi_startup_device(struct usb_serial *serial);
463 static int digi_startup(struct usb_serial *serial);
464 static void digi_shutdown(struct usb_serial *serial);
465 static void digi_read_bulk_callback(struct urb *urb);
466 static int digi_read_inb_callback(struct urb *urb);
467 static int digi_read_oob_callback(struct urb *urb);
470 /* Statics */
472 static int debug;
474 static struct usb_device_id id_table_combined [] = {
475 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
476 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
477 { } /* Terminating entry */
480 static struct usb_device_id id_table_2 [] = {
481 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
482 { } /* Terminating entry */
485 static struct usb_device_id id_table_4 [] = {
486 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
487 { } /* Terminating entry */
490 MODULE_DEVICE_TABLE (usb, id_table_combined);
492 static struct usb_driver digi_driver = {
493 .name = "digi_acceleport",
494 .probe = usb_serial_probe,
495 .disconnect = usb_serial_disconnect,
496 .id_table = id_table_combined,
497 .no_dynamic_id = 1,
501 /* device info needed for the Digi serial converter */
503 static struct usb_serial_driver digi_acceleport_2_device = {
504 .driver = {
505 .owner = THIS_MODULE,
506 .name = "digi_2",
508 .description = "Digi 2 port USB adapter",
509 .usb_driver = &digi_driver,
510 .id_table = id_table_2,
511 .num_interrupt_in = 0,
512 .num_bulk_in = 4,
513 .num_bulk_out = 4,
514 .num_ports = 3,
515 .open = digi_open,
516 .close = digi_close,
517 .write = digi_write,
518 .write_room = digi_write_room,
519 .write_bulk_callback = digi_write_bulk_callback,
520 .read_bulk_callback = digi_read_bulk_callback,
521 .chars_in_buffer = digi_chars_in_buffer,
522 .throttle = digi_rx_throttle,
523 .unthrottle = digi_rx_unthrottle,
524 .ioctl = digi_ioctl,
525 .set_termios = digi_set_termios,
526 .break_ctl = digi_break_ctl,
527 .tiocmget = digi_tiocmget,
528 .tiocmset = digi_tiocmset,
529 .attach = digi_startup,
530 .shutdown = digi_shutdown,
533 static struct usb_serial_driver digi_acceleport_4_device = {
534 .driver = {
535 .owner = THIS_MODULE,
536 .name = "digi_4",
538 .description = "Digi 4 port USB adapter",
539 .usb_driver = &digi_driver,
540 .id_table = id_table_4,
541 .num_interrupt_in = 0,
542 .num_bulk_in = 5,
543 .num_bulk_out = 5,
544 .num_ports = 4,
545 .open = digi_open,
546 .close = digi_close,
547 .write = digi_write,
548 .write_room = digi_write_room,
549 .write_bulk_callback = digi_write_bulk_callback,
550 .read_bulk_callback = digi_read_bulk_callback,
551 .chars_in_buffer = digi_chars_in_buffer,
552 .throttle = digi_rx_throttle,
553 .unthrottle = digi_rx_unthrottle,
554 .ioctl = digi_ioctl,
555 .set_termios = digi_set_termios,
556 .break_ctl = digi_break_ctl,
557 .tiocmget = digi_tiocmget,
558 .tiocmset = digi_tiocmset,
559 .attach = digi_startup,
560 .shutdown = digi_shutdown,
564 /* Functions */
567 * Cond Wait Interruptible Timeout Irqrestore
569 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
570 * so that wake ups are not lost if they occur between the unlock
571 * and the sleep. In other words, spin_unlock_irqrestore and
572 * interruptible_sleep_on_timeout are "atomic" with respect to
573 * wake ups. This is used to implement condition variables.
575 * interruptible_sleep_on_timeout is deprecated and has been replaced
576 * with the equivalent code.
579 static long cond_wait_interruptible_timeout_irqrestore(
580 wait_queue_head_t *q, long timeout,
581 spinlock_t *lock, unsigned long flags)
583 DEFINE_WAIT(wait);
585 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
586 spin_unlock_irqrestore(lock, flags);
587 timeout = schedule_timeout(timeout);
588 finish_wait(q, &wait);
590 return timeout;
595 * Digi Wakeup Write
597 * Wake up port, line discipline, and tty processes sleeping
598 * on writes.
601 static void digi_wakeup_write_lock(struct work_struct *work)
603 struct digi_port *priv = container_of(work, struct digi_port, dp_wakeup_work);
604 struct usb_serial_port *port = priv->dp_port;
605 unsigned long flags;
607 spin_lock_irqsave(&priv->dp_port_lock, flags);
608 digi_wakeup_write(port);
609 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
612 static void digi_wakeup_write(struct usb_serial_port *port)
614 tty_wakeup(port->tty);
619 * Digi Write OOB Command
621 * Write commands on the out of band port. Commands are 4
622 * bytes each, multiple commands can be sent at once, and
623 * no command will be split across USB packets. Returns 0
624 * if successful, -EINTR if interrupted while sleeping and
625 * the interruptible flag is true, or a negative error
626 * returned by usb_submit_urb.
629 static int digi_write_oob_command(struct usb_serial_port *port,
630 unsigned char *buf, int count, int interruptible)
633 int ret = 0;
634 int len;
635 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
636 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
637 unsigned long flags = 0;
639 dbg("digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count);
641 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
642 while(count > 0) {
643 while(oob_port->write_urb->status == -EINPROGRESS
644 || oob_priv->dp_write_urb_in_use) {
645 cond_wait_interruptible_timeout_irqrestore(
646 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
647 &oob_priv->dp_port_lock, flags);
648 if (interruptible && signal_pending(current))
649 return -EINTR;
650 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
653 /* len must be a multiple of 4, so commands are not split */
654 len = min(count, oob_port->bulk_out_size);
655 if (len > 4)
656 len &= ~3;
657 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
658 oob_port->write_urb->transfer_buffer_length = len;
659 oob_port->write_urb->dev = port->serial->dev;
660 if ((ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0) {
661 oob_priv->dp_write_urb_in_use = 1;
662 count -= len;
663 buf += len;
666 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
667 if (ret)
668 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, ret);
669 return ret;
675 * Digi Write In Band Command
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.
686 static int digi_write_inb_command(struct usb_serial_port *port,
687 unsigned char *buf, int count, unsigned long timeout)
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;
695 dbg("digi_write_inb_command: TOP: port=%d, count=%d",
696 priv->dp_port_num, count);
698 if (timeout)
699 timeout += jiffies;
700 else
701 timeout = ULONG_MAX;
703 spin_lock_irqsave(&priv->dp_port_lock, flags);
704 while(count > 0 && ret == 0) {
705 while((port->write_urb->status == -EINPROGRESS
706 || priv->dp_write_urb_in_use) && 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);
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;
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;
735 port->write_urb->dev = port->serial->dev;
737 if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0) {
738 priv->dp_write_urb_in_use = 1;
739 priv->dp_out_buf_len = 0;
740 count -= len;
741 buf += len;
745 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
747 if (ret)
748 err("%s: usb_submit_urb failed, ret=%d, port=%d",
749 __FUNCTION__, ret, priv->dp_port_num);
750 return ret;
755 * Digi Set Modem Signals
757 * Sets or clears DTR and RTS on the port, according to the
758 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
759 * for the modem_signals argument. Returns 0 if successful,
760 * -EINTR if interrupted while sleeping, or a non-zero error
761 * returned by usb_submit_urb.
764 static int digi_set_modem_signals(struct usb_serial_port *port,
765 unsigned int modem_signals, int interruptible)
768 int ret;
769 struct digi_port *port_priv = usb_get_serial_port_data(port);
770 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
771 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
772 unsigned char *data = oob_port->write_urb->transfer_buffer;
773 unsigned long flags = 0;
776 dbg("digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
777 port_priv->dp_port_num, modem_signals);
779 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
780 spin_lock(&port_priv->dp_port_lock);
782 while(oob_port->write_urb->status == -EINPROGRESS || oob_priv->dp_write_urb_in_use) {
783 spin_unlock(&port_priv->dp_port_lock);
784 cond_wait_interruptible_timeout_irqrestore(
785 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
786 &oob_priv->dp_port_lock, flags);
787 if (interruptible && signal_pending(current))
788 return -EINTR;
789 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
790 spin_lock(&port_priv->dp_port_lock);
792 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
793 data[1] = port_priv->dp_port_num;
794 data[2] = (modem_signals&TIOCM_DTR) ? DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
795 data[3] = 0;
796 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
797 data[5] = port_priv->dp_port_num;
798 data[6] = (modem_signals&TIOCM_RTS) ? DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
799 data[7] = 0;
801 oob_port->write_urb->transfer_buffer_length = 8;
802 oob_port->write_urb->dev = port->serial->dev;
804 if ((ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0) {
805 oob_priv->dp_write_urb_in_use = 1;
806 port_priv->dp_modem_signals =
807 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
808 | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
810 spin_unlock(&port_priv->dp_port_lock);
811 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
812 if (ret)
813 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, ret);
814 return ret;
818 * Digi Transmit Idle
820 * Digi transmit idle waits, up to timeout ticks, for the transmitter
821 * to go idle. It returns 0 if successful or a negative error.
823 * There are race conditions here if more than one process is calling
824 * digi_transmit_idle on the same port at the same time. However, this
825 * is only called from close, and only one process can be in close on a
826 * port at a time, so its ok.
829 static int digi_transmit_idle(struct usb_serial_port *port,
830 unsigned long timeout)
832 int ret;
833 unsigned char buf[2];
834 struct digi_port *priv = usb_get_serial_port_data(port);
835 unsigned long flags = 0;
837 spin_lock_irqsave(&priv->dp_port_lock, flags);
838 priv->dp_transmit_idle = 0;
839 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
841 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
842 buf[1] = 0;
844 timeout += jiffies;
846 if ((ret = digi_write_inb_command(port, buf, 2, timeout - jiffies)) != 0)
847 return ret;
849 spin_lock_irqsave(&priv->dp_port_lock, flags);
851 while(time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
852 cond_wait_interruptible_timeout_irqrestore(
853 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
854 &priv->dp_port_lock, flags);
855 if (signal_pending(current))
856 return -EINTR;
857 spin_lock_irqsave(&priv->dp_port_lock, flags);
859 priv->dp_transmit_idle = 0;
860 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
861 return 0;
866 static void digi_rx_throttle(struct usb_serial_port *port)
868 unsigned long flags;
869 struct digi_port *priv = usb_get_serial_port_data(port);
872 dbg("digi_rx_throttle: TOP: port=%d", priv->dp_port_num);
874 /* stop receiving characters by not resubmitting the read urb */
875 spin_lock_irqsave(&priv->dp_port_lock, flags);
876 priv->dp_throttled = 1;
877 priv->dp_throttle_restart = 0;
878 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
882 static void digi_rx_unthrottle(struct usb_serial_port *port)
884 int ret = 0;
885 unsigned long flags;
886 struct digi_port *priv = usb_get_serial_port_data(port);
888 dbg("digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num);
890 spin_lock_irqsave(&priv->dp_port_lock, flags);
892 /* turn throttle off */
893 priv->dp_throttled = 0;
894 priv->dp_throttle_restart = 0;
896 /* restart read chain */
897 if (priv->dp_throttle_restart) {
898 port->read_urb->dev = port->serial->dev;
899 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
902 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
904 if (ret)
905 err("%s: usb_submit_urb failed, ret=%d, port=%d",
906 __FUNCTION__, ret, priv->dp_port_num);
910 static void digi_set_termios(struct usb_serial_port *port,
911 struct ktermios *old_termios)
914 struct digi_port *priv = usb_get_serial_port_data(port);
915 struct tty_struct *tty = port->tty;
916 unsigned int iflag = tty->termios->c_iflag;
917 unsigned int cflag = tty->termios->c_cflag;
918 unsigned int old_iflag = old_termios->c_iflag;
919 unsigned int old_cflag = old_termios->c_cflag;
920 unsigned char buf[32];
921 unsigned int modem_signals;
922 int arg,ret;
923 int i = 0;
924 speed_t baud;
926 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);
928 /* set baud rate */
929 if ((baud = tty_get_baud_rate(tty)) != tty_termios_baud_rate(old_termios)) {
930 arg = -1;
932 /* reassert DTR and (maybe) RTS on transition from B0 */
933 if ((old_cflag&CBAUD) == B0) {
934 /* don't set RTS if using hardware flow control */
935 /* and throttling input */
936 modem_signals = TIOCM_DTR;
937 if (!(tty->termios->c_cflag & CRTSCTS) ||
938 !test_bit(TTY_THROTTLED, &tty->flags))
939 modem_signals |= TIOCM_RTS;
940 digi_set_modem_signals(port, modem_signals, 1);
942 switch (baud) {
943 /* drop DTR and RTS on transition to B0 */
944 case 0: digi_set_modem_signals(port, 0, 1); break;
945 case 50: arg = DIGI_BAUD_50; break;
946 case 75: arg = DIGI_BAUD_75; break;
947 case 110: arg = DIGI_BAUD_110; break;
948 case 150: arg = DIGI_BAUD_150; break;
949 case 200: arg = DIGI_BAUD_200; break;
950 case 300: arg = DIGI_BAUD_300; break;
951 case 600: arg = DIGI_BAUD_600; break;
952 case 1200: arg = DIGI_BAUD_1200; break;
953 case 1800: arg = DIGI_BAUD_1800; break;
954 case 2400: arg = DIGI_BAUD_2400; break;
955 case 4800: arg = DIGI_BAUD_4800; break;
956 case 9600: arg = DIGI_BAUD_9600; break;
957 case 19200: arg = DIGI_BAUD_19200; break;
958 case 38400: arg = DIGI_BAUD_38400; break;
959 case 57600: arg = DIGI_BAUD_57600; break;
960 case 115200: arg = DIGI_BAUD_115200; break;
961 case 230400: arg = DIGI_BAUD_230400; break;
962 case 460800: arg = DIGI_BAUD_460800; break;
963 default:
964 arg = DIGI_BAUD_9600;
965 baud = 9600;
966 break;
968 if (arg != -1) {
969 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
970 buf[i++] = priv->dp_port_num;
971 buf[i++] = arg;
972 buf[i++] = 0;
975 /* set parity */
976 tty->termios->c_cflag &= ~CMSPAR;
978 if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
979 if (cflag&PARENB) {
980 if (cflag&PARODD)
981 arg = DIGI_PARITY_ODD;
982 else
983 arg = DIGI_PARITY_EVEN;
984 } else {
985 arg = DIGI_PARITY_NONE;
987 buf[i++] = DIGI_CMD_SET_PARITY;
988 buf[i++] = priv->dp_port_num;
989 buf[i++] = arg;
990 buf[i++] = 0;
992 /* set word size */
993 if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
994 arg = -1;
995 switch (cflag&CSIZE) {
996 case CS5: arg = DIGI_WORD_SIZE_5; break;
997 case CS6: arg = DIGI_WORD_SIZE_6; break;
998 case CS7: arg = DIGI_WORD_SIZE_7; break;
999 case CS8: arg = DIGI_WORD_SIZE_8; break;
1000 default:
1001 dbg("digi_set_termios: can't handle word size %d",
1002 (cflag&CSIZE));
1003 break;
1006 if (arg != -1) {
1007 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
1008 buf[i++] = priv->dp_port_num;
1009 buf[i++] = arg;
1010 buf[i++] = 0;
1015 /* set stop bits */
1016 if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
1018 if ((cflag&CSTOPB))
1019 arg = DIGI_STOP_BITS_2;
1020 else
1021 arg = DIGI_STOP_BITS_1;
1023 buf[i++] = DIGI_CMD_SET_STOP_BITS;
1024 buf[i++] = priv->dp_port_num;
1025 buf[i++] = arg;
1026 buf[i++] = 0;
1030 /* set input flow control */
1031 if ((iflag&IXOFF) != (old_iflag&IXOFF)
1032 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
1033 arg = 0;
1034 if (iflag&IXOFF)
1035 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1036 else
1037 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1039 if (cflag&CRTSCTS) {
1040 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
1042 /* On USB-4 it is necessary to assert RTS prior */
1043 /* to selecting RTS input flow control. */
1044 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
1045 buf[i++] = priv->dp_port_num;
1046 buf[i++] = DIGI_RTS_ACTIVE;
1047 buf[i++] = 0;
1049 } else {
1050 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
1052 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1053 buf[i++] = priv->dp_port_num;
1054 buf[i++] = arg;
1055 buf[i++] = 0;
1058 /* set output flow control */
1059 if ((iflag & IXON) != (old_iflag & IXON)
1060 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1061 arg = 0;
1062 if (iflag & IXON)
1063 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1064 else
1065 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1067 if (cflag & CRTSCTS) {
1068 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
1069 } else {
1070 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
1071 tty->hw_stopped = 0;
1074 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1075 buf[i++] = priv->dp_port_num;
1076 buf[i++] = arg;
1077 buf[i++] = 0;
1080 /* set receive enable/disable */
1081 if ((cflag & CREAD) != (old_cflag & CREAD)) {
1082 if (cflag & CREAD)
1083 arg = DIGI_ENABLE;
1084 else
1085 arg = DIGI_DISABLE;
1087 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
1088 buf[i++] = priv->dp_port_num;
1089 buf[i++] = arg;
1090 buf[i++] = 0;
1092 if ((ret = digi_write_oob_command(port, buf, i, 1)) != 0)
1093 dbg("digi_set_termios: write oob failed, ret=%d", ret);
1094 tty_encode_baud_rate(tty, baud, baud);
1098 static void digi_break_ctl(struct usb_serial_port *port, int break_state)
1100 unsigned char buf[4];
1102 buf[0] = DIGI_CMD_BREAK_CONTROL;
1103 buf[1] = 2; /* length */
1104 buf[2] = break_state ? 1 : 0;
1105 buf[3] = 0; /* pad */
1106 digi_write_inb_command(port, buf, 4, 0);
1110 static int digi_tiocmget(struct usb_serial_port *port, struct file *file)
1112 struct digi_port *priv = usb_get_serial_port_data(port);
1113 unsigned int val;
1114 unsigned long flags;
1116 dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num);
1118 spin_lock_irqsave(&priv->dp_port_lock, flags);
1119 val = priv->dp_modem_signals;
1120 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1121 return val;
1125 static int digi_tiocmset(struct usb_serial_port *port, struct file *file,
1126 unsigned int set, unsigned int clear)
1128 struct digi_port *priv = usb_get_serial_port_data(port);
1129 unsigned int val;
1130 unsigned long flags;
1132 dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num);
1134 spin_lock_irqsave(&priv->dp_port_lock, flags);
1135 val = (priv->dp_modem_signals & ~clear) | set;
1136 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1137 return digi_set_modem_signals(port, val, 1);
1141 static int digi_ioctl(struct usb_serial_port *port, struct file *file,
1142 unsigned int cmd, unsigned long arg)
1144 struct digi_port *priv = usb_get_serial_port_data(port);
1145 dbg("digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd);
1147 switch (cmd) {
1148 case TIOCMIWAIT:
1149 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
1150 /* TODO */
1151 return 0;
1152 case TIOCGICOUNT:
1153 /* return count of modemline transitions */
1154 /* TODO */
1155 return 0;
1157 return -ENOIOCTLCMD;
1161 static int digi_write(struct usb_serial_port *port, const unsigned char *buf, int count)
1164 int ret,data_len,new_len;
1165 struct digi_port *priv = usb_get_serial_port_data(port);
1166 unsigned char *data = port->write_urb->transfer_buffer;
1167 unsigned long flags = 0;
1169 dbg("digi_write: TOP: port=%d, count=%d, in_interrupt=%ld",
1170 priv->dp_port_num, count, in_interrupt());
1172 /* copy user data (which can sleep) before getting spin lock */
1173 count = min(count, port->bulk_out_size-2);
1174 count = min(64, count);
1176 /* be sure only one write proceeds at a time */
1177 /* there are races on the port private buffer */
1178 /* and races to check write_urb->status */
1179 spin_lock_irqsave(&priv->dp_port_lock, flags);
1181 /* wait for urb status clear to submit another urb */
1182 if (port->write_urb->status == -EINPROGRESS || priv->dp_write_urb_in_use) {
1183 /* buffer data if count is 1 (probably put_char) if possible */
1184 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
1185 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
1186 new_len = 1;
1187 } else {
1188 new_len = 0;
1190 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1191 return new_len;
1194 /* allow space for any buffered data and for new data, up to */
1195 /* transfer buffer size - 2 (for command and length bytes) */
1196 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
1197 data_len = new_len + priv->dp_out_buf_len;
1199 if (data_len == 0) {
1200 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1201 return 0;
1204 port->write_urb->transfer_buffer_length = data_len+2;
1205 port->write_urb->dev = port->serial->dev;
1207 *data++ = DIGI_CMD_SEND_DATA;
1208 *data++ = data_len;
1210 /* copy in buffered data first */
1211 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
1212 data += priv->dp_out_buf_len;
1214 /* copy in new data */
1215 memcpy(data, buf, new_len);
1217 if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0) {
1218 priv->dp_write_urb_in_use = 1;
1219 ret = new_len;
1220 priv->dp_out_buf_len = 0;
1223 /* return length of new data written, or error */
1224 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1225 if (ret < 0)
1226 err("%s: usb_submit_urb failed, ret=%d, port=%d",
1227 __FUNCTION__, ret, priv->dp_port_num);
1228 dbg("digi_write: returning %d", ret);
1229 return ret;
1233 static void digi_write_bulk_callback(struct urb *urb)
1236 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1237 struct usb_serial *serial;
1238 struct digi_port *priv;
1239 struct digi_serial *serial_priv;
1240 int ret = 0;
1241 int status = urb->status;
1243 dbg("digi_write_bulk_callback: TOP, urb->status=%d", status);
1245 /* port and serial sanity check */
1246 if (port == NULL || (priv=usb_get_serial_port_data(port)) == NULL) {
1247 err("%s: port or port->private is NULL, status=%d",
1248 __FUNCTION__, status);
1249 return;
1251 serial = port->serial;
1252 if (serial == NULL || (serial_priv=usb_get_serial_data(serial)) == NULL) {
1253 err("%s: serial or serial->private is NULL, status=%d",
1254 __FUNCTION__, status);
1255 return;
1258 /* handle oob callback */
1259 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1260 dbg("digi_write_bulk_callback: oob callback");
1261 spin_lock(&priv->dp_port_lock);
1262 priv->dp_write_urb_in_use = 0;
1263 wake_up_interruptible(&port->write_wait);
1264 spin_unlock(&priv->dp_port_lock);
1265 return;
1268 /* try to send any buffered data on this port, if it is open */
1269 spin_lock(&priv->dp_port_lock);
1270 priv->dp_write_urb_in_use = 0;
1271 if (port->open_count && port->write_urb->status != -EINPROGRESS
1272 && priv->dp_out_buf_len > 0) {
1273 *((unsigned char *)(port->write_urb->transfer_buffer))
1274 = (unsigned char)DIGI_CMD_SEND_DATA;
1275 *((unsigned char *)(port->write_urb->transfer_buffer)+1)
1276 = (unsigned char)priv->dp_out_buf_len;
1277 port->write_urb->transfer_buffer_length = priv->dp_out_buf_len+2;
1278 port->write_urb->dev = serial->dev;
1279 memcpy(port->write_urb->transfer_buffer+2, priv->dp_out_buf,
1280 priv->dp_out_buf_len);
1281 if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0) {
1282 priv->dp_write_urb_in_use = 1;
1283 priv->dp_out_buf_len = 0;
1286 /* wake up processes sleeping on writes immediately */
1287 digi_wakeup_write(port);
1288 /* also queue up a wakeup at scheduler time, in case we */
1289 /* lost the race in write_chan(). */
1290 schedule_work(&priv->dp_wakeup_work);
1292 spin_unlock(&priv->dp_port_lock);
1293 if (ret)
1294 err("%s: usb_submit_urb failed, ret=%d, port=%d",
1295 __FUNCTION__, ret, priv->dp_port_num);
1298 static int digi_write_room(struct usb_serial_port *port)
1301 int room;
1302 struct digi_port *priv = usb_get_serial_port_data(port);
1303 unsigned long flags = 0;
1305 spin_lock_irqsave(&priv->dp_port_lock, flags);
1307 if (port->write_urb->status == -EINPROGRESS || priv->dp_write_urb_in_use)
1308 room = 0;
1309 else
1310 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1312 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1313 dbg("digi_write_room: port=%d, room=%d", priv->dp_port_num, room);
1314 return room;
1318 static int digi_chars_in_buffer(struct usb_serial_port *port)
1321 struct digi_port *priv = usb_get_serial_port_data(port);
1324 if (port->write_urb->status == -EINPROGRESS
1325 || priv->dp_write_urb_in_use) {
1326 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1327 priv->dp_port_num, port->bulk_out_size - 2);
1328 /* return(port->bulk_out_size - 2); */
1329 return 256;
1330 } else {
1331 dbg("digi_chars_in_buffer: port=%d, chars=%d",
1332 priv->dp_port_num, priv->dp_out_buf_len);
1333 return priv->dp_out_buf_len;
1339 static int digi_open(struct usb_serial_port *port, struct file *filp)
1341 int ret;
1342 unsigned char buf[32];
1343 struct digi_port *priv = usb_get_serial_port_data(port);
1344 struct ktermios not_termios;
1345 unsigned long flags = 0;
1347 dbg("digi_open: TOP: port=%d, open_count=%d",
1348 priv->dp_port_num, port->open_count);
1350 /* be sure the device is started up */
1351 if (digi_startup_device(port->serial) != 0)
1352 return -ENXIO;
1354 spin_lock_irqsave(&priv->dp_port_lock, flags);
1356 /* don't wait on a close in progress for non-blocking opens */
1357 if (priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) {
1358 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1359 return -EAGAIN;
1362 /* wait for a close in progress to finish */
1363 while(priv->dp_in_close) {
1364 cond_wait_interruptible_timeout_irqrestore(
1365 &priv->dp_close_wait, DIGI_RETRY_TIMEOUT,
1366 &priv->dp_port_lock, flags);
1367 if (signal_pending(current))
1368 return -EINTR;
1369 spin_lock_irqsave(&priv->dp_port_lock, flags);
1372 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1374 /* read modem signals automatically whenever they change */
1375 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1376 buf[1] = priv->dp_port_num;
1377 buf[2] = DIGI_ENABLE;
1378 buf[3] = 0;
1380 /* flush fifos */
1381 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1382 buf[5] = priv->dp_port_num;
1383 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1384 buf[7] = 0;
1386 if ((ret = digi_write_oob_command(port, buf, 8, 1)) != 0)
1387 dbg("digi_open: write oob failed, ret=%d", ret);
1389 /* set termios settings */
1390 not_termios.c_cflag = ~port->tty->termios->c_cflag;
1391 not_termios.c_iflag = ~port->tty->termios->c_iflag;
1392 digi_set_termios(port, &not_termios);
1394 /* set DTR and RTS */
1395 digi_set_modem_signals(port, TIOCM_DTR|TIOCM_RTS, 1);
1397 return 0;
1401 static void digi_close(struct usb_serial_port *port, struct file *filp)
1403 DEFINE_WAIT(wait);
1404 int ret;
1405 unsigned char buf[32];
1406 struct tty_struct *tty = port->tty;
1407 struct digi_port *priv = usb_get_serial_port_data(port);
1408 unsigned long flags = 0;
1410 dbg("digi_close: TOP: port=%d, open_count=%d",
1411 priv->dp_port_num, port->open_count);
1413 /* if disconnected, just clear flags */
1414 if (!usb_get_intfdata(port->serial->interface))
1415 goto exit;
1417 /* do cleanup only after final close on this port */
1418 spin_lock_irqsave(&priv->dp_port_lock, flags);
1419 priv->dp_in_close = 1;
1420 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1422 /* tell line discipline to process only XON/XOFF */
1423 tty->closing = 1;
1425 /* wait for output to drain */
1426 if ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0)
1427 tty_wait_until_sent(tty, DIGI_CLOSE_TIMEOUT);
1429 /* flush driver and line discipline buffers */
1430 if (tty->driver->flush_buffer)
1431 tty->driver->flush_buffer(tty);
1432 tty_ldisc_flush(tty);
1434 if (port->serial->dev) {
1435 /* wait for transmit idle */
1436 if ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) {
1437 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1439 /* drop DTR and RTS */
1440 digi_set_modem_signals(port, 0, 0);
1442 /* disable input flow control */
1443 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1444 buf[1] = priv->dp_port_num;
1445 buf[2] = DIGI_DISABLE;
1446 buf[3] = 0;
1448 /* disable output flow control */
1449 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1450 buf[5] = priv->dp_port_num;
1451 buf[6] = DIGI_DISABLE;
1452 buf[7] = 0;
1454 /* disable reading modem signals automatically */
1455 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1456 buf[9] = priv->dp_port_num;
1457 buf[10] = DIGI_DISABLE;
1458 buf[11] = 0;
1460 /* disable receive */
1461 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1462 buf[13] = priv->dp_port_num;
1463 buf[14] = DIGI_DISABLE;
1464 buf[15] = 0;
1466 /* flush fifos */
1467 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1468 buf[17] = priv->dp_port_num;
1469 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1470 buf[19] = 0;
1472 if ((ret = digi_write_oob_command(port, buf, 20, 0)) != 0)
1473 dbg("digi_close: write oob failed, ret=%d", ret);
1475 /* wait for final commands on oob port to complete */
1476 prepare_to_wait(&priv->dp_flush_wait, &wait, TASK_INTERRUPTIBLE);
1477 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1478 finish_wait(&priv->dp_flush_wait, &wait);
1480 /* shutdown any outstanding bulk writes */
1481 usb_kill_urb(port->write_urb);
1483 tty->closing = 0;
1484 exit:
1485 spin_lock_irqsave(&priv->dp_port_lock, flags);
1486 priv->dp_write_urb_in_use = 0;
1487 priv->dp_in_close = 0;
1488 wake_up_interruptible(&priv->dp_close_wait);
1489 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1490 dbg("digi_close: done");
1495 * Digi Startup Device
1497 * Starts reads on all ports. Must be called AFTER startup, with
1498 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1501 static int digi_startup_device(struct usb_serial *serial)
1503 int i,ret = 0;
1504 struct digi_serial *serial_priv = usb_get_serial_data(serial);
1505 struct usb_serial_port *port;
1507 /* be sure this happens exactly once */
1508 spin_lock(&serial_priv->ds_serial_lock);
1509 if (serial_priv->ds_device_started) {
1510 spin_unlock(&serial_priv->ds_serial_lock);
1511 return 0;
1513 serial_priv->ds_device_started = 1;
1514 spin_unlock(&serial_priv->ds_serial_lock);
1516 /* start reading from each bulk in endpoint for the device */
1517 /* set USB_DISABLE_SPD flag for write bulk urbs */
1518 for (i = 0; i < serial->type->num_ports + 1; i++) {
1519 port = serial->port[i];
1520 port->write_urb->dev = port->serial->dev;
1521 if ((ret = usb_submit_urb(port->read_urb, GFP_KERNEL)) != 0) {
1522 err("%s: usb_submit_urb failed, ret=%d, port=%d",
1523 __FUNCTION__, ret, i);
1524 break;
1527 return ret;
1531 static int digi_startup(struct usb_serial *serial)
1534 int i;
1535 struct digi_port *priv;
1536 struct digi_serial *serial_priv;
1538 dbg("digi_startup: TOP");
1540 /* allocate the private data structures for all ports */
1541 /* number of regular ports + 1 for the out-of-band port */
1542 for(i = 0; i < serial->type->num_ports + 1; i++) {
1543 /* allocate port private structure */
1544 priv = kmalloc(sizeof(struct digi_port), GFP_KERNEL);
1545 if (priv == NULL) {
1546 while (--i >= 0)
1547 kfree(usb_get_serial_port_data(serial->port[i]));
1548 return 1; /* error */
1551 /* initialize port private structure */
1552 spin_lock_init(&priv->dp_port_lock);
1553 priv->dp_port_num = i;
1554 priv->dp_out_buf_len = 0;
1555 priv->dp_write_urb_in_use = 0;
1556 priv->dp_modem_signals = 0;
1557 init_waitqueue_head(&priv->dp_modem_change_wait);
1558 priv->dp_transmit_idle = 0;
1559 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1560 priv->dp_throttled = 0;
1561 priv->dp_throttle_restart = 0;
1562 init_waitqueue_head(&priv->dp_flush_wait);
1563 priv->dp_in_close = 0;
1564 init_waitqueue_head(&priv->dp_close_wait);
1565 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1566 priv->dp_port = serial->port[i];
1567 /* initialize write wait queue for this port */
1568 init_waitqueue_head(&serial->port[i]->write_wait);
1570 usb_set_serial_port_data(serial->port[i], priv);
1573 /* allocate serial private structure */
1574 serial_priv = kmalloc(sizeof(struct digi_serial), GFP_KERNEL);
1575 if (serial_priv == NULL) {
1576 for (i = 0; i < serial->type->num_ports + 1; i++)
1577 kfree(usb_get_serial_port_data(serial->port[i]));
1578 return 1; /* error */
1581 /* initialize serial private structure */
1582 spin_lock_init(&serial_priv->ds_serial_lock);
1583 serial_priv->ds_oob_port_num = serial->type->num_ports;
1584 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1585 serial_priv->ds_device_started = 0;
1586 usb_set_serial_data(serial, serial_priv);
1588 return 0;
1592 static void digi_shutdown(struct usb_serial *serial)
1594 int i;
1595 dbg("digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt());
1597 /* stop reads and writes on all ports */
1598 for (i = 0; i < serial->type->num_ports + 1; i++) {
1599 usb_kill_urb(serial->port[i]->read_urb);
1600 usb_kill_urb(serial->port[i]->write_urb);
1603 /* free the private data structures for all ports */
1604 /* number of regular ports + 1 for the out-of-band port */
1605 for(i = 0; i < serial->type->num_ports + 1; i++)
1606 kfree(usb_get_serial_port_data(serial->port[i]));
1607 kfree(usb_get_serial_data(serial));
1611 static void digi_read_bulk_callback(struct urb *urb)
1613 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1614 struct digi_port *priv;
1615 struct digi_serial *serial_priv;
1616 int ret;
1617 int status = urb->status;
1619 dbg("digi_read_bulk_callback: TOP");
1621 /* port sanity check, do not resubmit if port is not valid */
1622 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
1623 err("%s: port or port->private is NULL, status=%d",
1624 __FUNCTION__, status);
1625 return;
1627 if (port->serial == NULL ||
1628 (serial_priv=usb_get_serial_data(port->serial)) == NULL) {
1629 err("%s: serial is bad or serial->private is NULL, status=%d",
1630 __FUNCTION__, status);
1631 return;
1634 /* do not resubmit urb if it has any status error */
1635 if (status) {
1636 err("%s: nonzero read bulk status: status=%d, port=%d",
1637 __FUNCTION__, status, priv->dp_port_num);
1638 return;
1641 /* handle oob or inb callback, do not resubmit if error */
1642 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1643 if (digi_read_oob_callback(urb) != 0)
1644 return;
1645 } else {
1646 if (digi_read_inb_callback(urb) != 0)
1647 return;
1650 /* continue read */
1651 urb->dev = port->serial->dev;
1652 if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) != 0) {
1653 err("%s: failed resubmitting urb, ret=%d, port=%d",
1654 __FUNCTION__, ret, priv->dp_port_num);
1660 * Digi Read INB Callback
1662 * Digi Read INB Callback handles reads on the in band ports, sending
1663 * the data on to the tty subsystem. When called we know port and
1664 * port->private are not NULL and port->serial has been validated.
1665 * It returns 0 if successful, 1 if successful but the port is
1666 * throttled, and -1 if the sanity checks failed.
1669 static int digi_read_inb_callback(struct urb *urb)
1672 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1673 struct tty_struct *tty = port->tty;
1674 struct digi_port *priv = usb_get_serial_port_data(port);
1675 int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1676 int len = ((unsigned char *)urb->transfer_buffer)[1];
1677 int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1678 unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3;
1679 int flag,throttled;
1680 int i;
1681 int status = urb->status;
1683 /* do not process callbacks on closed ports */
1684 /* but do continue the read chain */
1685 if (port->open_count == 0)
1686 return 0;
1688 /* short/multiple packet check */
1689 if (urb->actual_length != len + 2) {
1690 err("%s: INCOMPLETE OR MULTIPLE PACKET, urb->status=%d, "
1691 "port=%d, opcode=%d, len=%d, actual_length=%d, "
1692 "status=%d", __FUNCTION__, status, priv->dp_port_num,
1693 opcode, len, urb->actual_length, port_status);
1694 return -1;
1697 spin_lock(&priv->dp_port_lock);
1699 /* check for throttle; if set, do not resubmit read urb */
1700 /* indicate the read chain needs to be restarted on unthrottle */
1701 throttled = priv->dp_throttled;
1702 if (throttled)
1703 priv->dp_throttle_restart = 1;
1705 /* receive data */
1706 if (opcode == DIGI_CMD_RECEIVE_DATA) {
1707 /* get flag from port_status */
1708 flag = 0;
1710 /* overrun is special, not associated with a char */
1711 if (port_status & DIGI_OVERRUN_ERROR)
1712 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1714 /* break takes precedence over parity, */
1715 /* which takes precedence over framing errors */
1716 if (port_status & DIGI_BREAK_ERROR)
1717 flag = TTY_BREAK;
1718 else if (port_status & DIGI_PARITY_ERROR)
1719 flag = TTY_PARITY;
1720 else if (port_status & DIGI_FRAMING_ERROR)
1721 flag = TTY_FRAME;
1723 /* data length is len-1 (one byte of len is port_status) */
1724 --len;
1726 len = tty_buffer_request_room(tty, len);
1727 if (len > 0) {
1728 /* Hot path */
1729 if (flag == TTY_NORMAL)
1730 tty_insert_flip_string(tty, data, len);
1731 else {
1732 for(i = 0; i < len; i++)
1733 tty_insert_flip_char(tty, data[i], flag);
1735 tty_flip_buffer_push(tty);
1738 spin_unlock(&priv->dp_port_lock);
1740 if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1741 dbg("%s: got RECEIVE_DISABLE", __FUNCTION__);
1742 else if (opcode != DIGI_CMD_RECEIVE_DATA)
1743 dbg("%s: unknown opcode: %d", __FUNCTION__, opcode);
1745 return(throttled ? 1 : 0);
1751 * Digi Read OOB Callback
1753 * Digi Read OOB Callback handles reads on the out of band port.
1754 * When called we know port and port->private are not NULL and
1755 * the port->serial is valid. It returns 0 if successful, and
1756 * -1 if the sanity checks failed.
1759 static int digi_read_oob_callback(struct urb *urb)
1762 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1763 struct usb_serial *serial = port->serial;
1764 struct digi_port *priv = usb_get_serial_port_data(port);
1765 int opcode, line, status, val;
1766 int i;
1768 dbg("digi_read_oob_callback: port=%d, len=%d",
1769 priv->dp_port_num, urb->actual_length);
1771 /* handle each oob command */
1772 for(i = 0; i < urb->actual_length - 3;) {
1773 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1774 line = ((unsigned char *)urb->transfer_buffer)[i++];
1775 status = ((unsigned char *)urb->transfer_buffer)[i++];
1776 val = ((unsigned char *)urb->transfer_buffer)[i++];
1778 dbg("digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1779 opcode, line, status, val);
1781 if (status != 0 || line >= serial->type->num_ports)
1782 continue;
1784 port = serial->port[line];
1786 if ((priv=usb_get_serial_port_data(port)) == NULL)
1787 return -1;
1789 if (opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1790 spin_lock(&priv->dp_port_lock);
1791 /* convert from digi flags to termiox flags */
1792 if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1793 priv->dp_modem_signals |= TIOCM_CTS;
1794 /* port must be open to use tty struct */
1795 if (port->open_count
1796 && port->tty->termios->c_cflag & CRTSCTS) {
1797 port->tty->hw_stopped = 0;
1798 digi_wakeup_write(port);
1800 } else {
1801 priv->dp_modem_signals &= ~TIOCM_CTS;
1802 /* port must be open to use tty struct */
1803 if (port->open_count
1804 && port->tty->termios->c_cflag & CRTSCTS) {
1805 port->tty->hw_stopped = 1;
1808 if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1809 priv->dp_modem_signals |= TIOCM_DSR;
1810 else
1811 priv->dp_modem_signals &= ~TIOCM_DSR;
1812 if (val & DIGI_READ_INPUT_SIGNALS_RI)
1813 priv->dp_modem_signals |= TIOCM_RI;
1814 else
1815 priv->dp_modem_signals &= ~TIOCM_RI;
1816 if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1817 priv->dp_modem_signals |= TIOCM_CD;
1818 else
1819 priv->dp_modem_signals &= ~TIOCM_CD;
1821 wake_up_interruptible(&priv->dp_modem_change_wait);
1822 spin_unlock(&priv->dp_port_lock);
1823 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1824 spin_lock(&priv->dp_port_lock);
1825 priv->dp_transmit_idle = 1;
1826 wake_up_interruptible(&priv->dp_transmit_idle_wait);
1827 spin_unlock(&priv->dp_port_lock);
1828 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1829 wake_up_interruptible(&priv->dp_flush_wait);
1832 return 0;
1836 static int __init digi_init(void)
1838 int retval;
1839 retval = usb_serial_register(&digi_acceleport_2_device);
1840 if (retval)
1841 goto failed_acceleport_2_device;
1842 retval = usb_serial_register(&digi_acceleport_4_device);
1843 if (retval)
1844 goto failed_acceleport_4_device;
1845 retval = usb_register(&digi_driver);
1846 if (retval)
1847 goto failed_usb_register;
1848 info(DRIVER_VERSION ":" DRIVER_DESC);
1849 return 0;
1850 failed_usb_register:
1851 usb_serial_deregister(&digi_acceleport_4_device);
1852 failed_acceleport_4_device:
1853 usb_serial_deregister(&digi_acceleport_2_device);
1854 failed_acceleport_2_device:
1855 return retval;
1858 static void __exit digi_exit (void)
1860 usb_deregister(&digi_driver);
1861 usb_serial_deregister(&digi_acceleport_2_device);
1862 usb_serial_deregister(&digi_acceleport_4_device);
1866 module_init(digi_init);
1867 module_exit(digi_exit);
1870 MODULE_AUTHOR(DRIVER_AUTHOR);
1871 MODULE_DESCRIPTION(DRIVER_DESC);
1872 MODULE_LICENSE("GPL");
1874 module_param(debug, bool, S_IRUGO | S_IWUSR);
1875 MODULE_PARM_DESC(debug, "Debug enabled or not");