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1da177e4 LT |
1 | /* |
2 | * Digi AccelePort USB-4 and USB-2 Serial Converters | |
3 | * | |
4 | * Copyright 2000 by Digi International | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's | |
12 | * usb-serial driver. | |
13 | * | |
14 | * Peter Berger (pberger@brimson.com) | |
15 | * Al Borchers (borchers@steinerpoint.com) | |
16 | * | |
17 | * (12/03/2001) gkh | |
18 | * switched to using port->open_count instead of private version. | |
19 | * Removed port->active | |
20 | * | |
21 | * (04/08/2001) gb | |
22 | * Identify version on module load. | |
23 | * | |
24 | * (11/01/2000) Adam J. Richter | |
25 | * usb_device_id table support | |
26 | * | |
27 | * (11/01/2000) pberger and borchers | |
28 | * -- Turned off the USB_DISABLE_SPD flag for write bulk urbs--it caused | |
29 | * USB 4 ports to hang on startup. | |
30 | * -- Serialized access to write urbs by adding the dp_write_urb_in_use | |
31 | * flag; otherwise, the driver caused SMP system hangs. Watching the | |
32 | * urb status is not sufficient. | |
33 | * | |
34 | * (10/05/2000) gkh | |
35 | * -- Fixed bug with urb->dev not being set properly, now that the usb | |
36 | * core needs it. | |
37 | * | |
38 | * (8/8/2000) pberger and borchers | |
39 | * -- Fixed close so that | |
40 | * - it can timeout while waiting for transmit idle, if needed; | |
41 | * - it ignores interrupts when flushing the port, turning | |
42 | * of modem signalling, and so on; | |
43 | * - it waits for the flush to really complete before returning. | |
44 | * -- Read_bulk_callback and write_bulk_callback check for a closed | |
45 | * port before using the tty struct or writing to the port. | |
46 | * -- The two changes above fix the oops caused by interrupted closes. | |
47 | * -- Added interruptible args to write_oob_command and set_modem_signals | |
48 | * and added a timeout arg to transmit_idle; needed for fixes to | |
49 | * close. | |
50 | * -- Added code for rx_throttle and rx_unthrottle so that input flow | |
51 | * control works. | |
52 | * -- Added code to set overrun, parity, framing, and break errors | |
53 | * (untested). | |
54 | * -- Set USB_DISABLE_SPD flag for write bulk urbs, so no 0 length | |
55 | * bulk writes are done. These hung the Digi USB device. The | |
56 | * 0 length bulk writes were a new feature of usb-uhci added in | |
57 | * the 2.4.0-test6 kernels. | |
58 | * -- Fixed mod inc race in open; do mod inc before sleeping to wait | |
59 | * for a close to finish. | |
60 | * | |
61 | * (7/31/2000) pberger | |
62 | * -- Fixed bugs with hardware handshaking: | |
63 | * - Added code to set/clear tty->hw_stopped in digi_read_oob_callback() | |
64 | * and digi_set_termios() | |
65 | * -- Added code in digi_set_termios() to | |
66 | * - add conditional in code handling transition from B0 to only | |
67 | * set RTS if RTS/CTS flow control is either not in use or if | |
68 | * the port is not currently throttled. | |
69 | * - handle turning off CRTSCTS. | |
70 | * | |
71 | * (7/30/2000) borchers | |
72 | * -- Added support for more than one Digi USB device by moving | |
73 | * globals to a private structure in the pointed to from the | |
74 | * usb_serial structure. | |
75 | * -- Moved the modem change and transmit idle wait queues into | |
76 | * the port private structure, so each port has its own queue | |
77 | * rather than sharing global queues. | |
78 | * -- Added support for break signals. | |
79 | * | |
80 | * (7/25/2000) pberger | |
81 | * -- Added USB-2 support. Note: the USB-2 supports 3 devices: two | |
82 | * serial and a parallel port. The parallel port is implemented | |
83 | * as a serial-to-parallel converter. That is, the driver actually | |
84 | * presents all three USB-2 interfaces as serial ports, but the third | |
85 | * one physically connects to a parallel device. Thus, for example, | |
86 | * one could plug a parallel printer into the USB-2's third port, | |
87 | * but from the kernel's (and userland's) point of view what's | |
88 | * actually out there is a serial device. | |
89 | * | |
90 | * (7/15/2000) borchers | |
91 | * -- Fixed race in open when a close is in progress. | |
92 | * -- Keep count of opens and dec the module use count for each | |
93 | * outstanding open when shutdown is called (on disconnect). | |
94 | * -- Fixed sanity checks in read_bulk_callback and write_bulk_callback | |
95 | * so pointers are checked before use. | |
96 | * -- Split read bulk callback into in band and out of band | |
97 | * callbacks, and no longer restart read chains if there is | |
98 | * a status error or a sanity error. This fixed the seg | |
99 | * faults and other errors we used to get on disconnect. | |
100 | * -- Port->active is once again a flag as usb-serial intended it | |
101 | * to be, not a count. Since it was only a char it would | |
102 | * have been limited to 256 simultaneous opens. Now the open | |
103 | * count is kept in the port private structure in dp_open_count. | |
104 | * -- Added code for modularization of the digi_acceleport driver. | |
105 | * | |
106 | * (6/27/2000) pberger and borchers | |
107 | * -- Zeroed out sync field in the wakeup_task before first use; | |
108 | * otherwise the uninitialized value might prevent the task from | |
109 | * being scheduled. | |
110 | * -- Initialized ret value to 0 in write_bulk_callback, otherwise | |
111 | * the uninitialized value could cause a spurious debugging message. | |
112 | * | |
113 | * (6/22/2000) pberger and borchers | |
114 | * -- Made cond_wait_... inline--apparently on SPARC the flags arg | |
115 | * to spin_lock_irqsave cannot be passed to another function | |
116 | * to call spin_unlock_irqrestore. Thanks to Pauline Middelink. | |
117 | * -- In digi_set_modem_signals the inner nested spin locks use just | |
118 | * spin_lock() rather than spin_lock_irqsave(). The old code | |
119 | * mistakenly left interrupts off. Thanks to Pauline Middelink. | |
120 | * -- copy_from_user (which can sleep) is no longer called while a | |
121 | * spinlock is held. We copy to a local buffer before getting | |
122 | * the spinlock--don't like the extra copy but the code is simpler. | |
123 | * -- Printk and dbg are no longer called while a spin lock is held. | |
124 | * | |
125 | * (6/4/2000) pberger and borchers | |
126 | * -- Replaced separate calls to spin_unlock_irqrestore and | |
127 | * interruptible_sleep_on_timeout with a new function | |
128 | * cond_wait_interruptible_timeout_irqrestore. This eliminates | |
129 | * the race condition where the wake up could happen after | |
130 | * the unlock and before the sleep. | |
131 | * -- Close now waits for output to drain. | |
132 | * -- Open waits until any close in progress is finished. | |
133 | * -- All out of band responses are now processed, not just the | |
134 | * first in a USB packet. | |
135 | * -- Fixed a bug that prevented the driver from working when the | |
136 | * first Digi port was not the first USB serial port--the driver | |
137 | * was mistakenly using the external USB serial port number to | |
138 | * try to index into its internal ports. | |
139 | * -- Fixed an SMP bug -- write_bulk_callback is called directly from | |
140 | * an interrupt, so spin_lock_irqsave/spin_unlock_irqrestore are | |
141 | * needed for locks outside write_bulk_callback that are also | |
142 | * acquired by write_bulk_callback to prevent deadlocks. | |
143 | * -- Fixed support for select() by making digi_chars_in_buffer() | |
144 | * return 256 when -EINPROGRESS is set, as the line discipline | |
145 | * code in n_tty.c expects. | |
146 | * -- Fixed an include file ordering problem that prevented debugging | |
147 | * messages from working. | |
148 | * -- Fixed an intermittent timeout problem that caused writes to | |
149 | * sometimes get stuck on some machines on some kernels. It turns | |
150 | * out in these circumstances write_chan() (in n_tty.c) was | |
151 | * asleep waiting for our wakeup call. Even though we call | |
152 | * wake_up_interruptible() in digi_write_bulk_callback(), there is | |
153 | * a race condition that could cause the wakeup to fail: if our | |
154 | * wake_up_interruptible() call occurs between the time that our | |
155 | * driver write routine finishes and write_chan() sets current->state | |
156 | * to TASK_INTERRUPTIBLE, the effect of our wakeup setting the state | |
157 | * to TASK_RUNNING will be lost and write_chan's subsequent call to | |
158 | * schedule() will never return (unless it catches a signal). | |
159 | * This race condition occurs because write_bulk_callback() (and thus | |
160 | * the wakeup) are called asynchonously from an interrupt, rather than | |
161 | * from the scheduler. We can avoid the race by calling the wakeup | |
162 | * from the scheduler queue and that's our fix: Now, at the end of | |
163 | * write_bulk_callback() we queue up a wakeup call on the scheduler | |
164 | * task queue. We still also invoke the wakeup directly since that | |
165 | * squeezes a bit more performance out of the driver, and any lost | |
166 | * race conditions will get cleaned up at the next scheduler run. | |
167 | * | |
168 | * NOTE: The problem also goes away if you comment out | |
169 | * the two code lines in write_chan() where current->state | |
170 | * is set to TASK_RUNNING just before calling driver.write() and to | |
171 | * TASK_INTERRUPTIBLE immediately afterwards. This is why the | |
172 | * problem did not show up with the 2.2 kernels -- they do not | |
173 | * include that code. | |
174 | * | |
175 | * (5/16/2000) pberger and borchers | |
176 | * -- Added timeouts to sleeps, to defend against lost wake ups. | |
177 | * -- Handle transition to/from B0 baud rate in digi_set_termios. | |
178 | * | |
179 | * (5/13/2000) pberger and borchers | |
180 | * -- All commands now sent on out of band port, using | |
181 | * digi_write_oob_command. | |
182 | * -- Get modem control signals whenever they change, support TIOCMGET/ | |
183 | * SET/BIS/BIC ioctls. | |
184 | * -- digi_set_termios now supports parity, word size, stop bits, and | |
185 | * receive enable. | |
186 | * -- Cleaned up open and close, use digi_set_termios and | |
187 | * digi_write_oob_command to set port parameters. | |
188 | * -- Added digi_startup_device to start read chains on all ports. | |
189 | * -- Write buffer is only used when count==1, to be sure put_char can | |
190 | * write a char (unless the buffer is full). | |
191 | * | |
192 | * (5/10/2000) pberger and borchers | |
193 | * -- Added MOD_INC_USE_COUNT/MOD_DEC_USE_COUNT calls on open/close. | |
194 | * -- Fixed problem where the first incoming character is lost on | |
195 | * port opens after the first close on that port. Now we keep | |
196 | * the read_urb chain open until shutdown. | |
197 | * -- Added more port conditioning calls in digi_open and digi_close. | |
198 | * -- Convert port->active to a use count so that we can deal with multiple | |
199 | * opens and closes properly. | |
200 | * -- Fixed some problems with the locking code. | |
201 | * | |
202 | * (5/3/2000) pberger and borchers | |
203 | * -- First alpha version of the driver--many known limitations and bugs. | |
204 | * | |
205 | * | |
206 | * Locking and SMP | |
207 | * | |
208 | * - Each port, including the out-of-band port, has a lock used to | |
209 | * serialize all access to the port's private structure. | |
210 | * - The port lock is also used to serialize all writes and access to | |
211 | * the port's URB. | |
212 | * - The port lock is also used for the port write_wait condition | |
213 | * variable. Holding the port lock will prevent a wake up on the | |
214 | * port's write_wait; this can be used with cond_wait_... to be sure | |
215 | * the wake up is not lost in a race when dropping the lock and | |
216 | * sleeping waiting for the wakeup. | |
217 | * - digi_write() does not sleep, since it is sometimes called on | |
218 | * interrupt time. | |
219 | * - digi_write_bulk_callback() and digi_read_bulk_callback() are | |
220 | * called directly from interrupts. Hence spin_lock_irqsave() | |
221 | * and spin_unlock_irqrestore() are used in the rest of the code | |
222 | * for any locks they acquire. | |
223 | * - digi_write_bulk_callback() gets the port lock before waking up | |
224 | * processes sleeping on the port write_wait. It also schedules | |
225 | * wake ups so they happen from the scheduler, because the tty | |
226 | * system can miss wake ups from interrupts. | |
227 | * - All sleeps use a timeout of DIGI_RETRY_TIMEOUT before looping to | |
228 | * recheck the condition they are sleeping on. This is defensive, | |
229 | * in case a wake up is lost. | |
230 | * - Following Documentation/DocBook/kernel-locking.pdf no spin locks | |
231 | * are held when calling copy_to/from_user or printk. | |
232 | * | |
233 | * $Id: digi_acceleport.c,v 1.80.1.2 2000/11/02 05:45:08 root Exp $ | |
234 | */ | |
235 | ||
236 | #include <linux/config.h> | |
237 | #include <linux/kernel.h> | |
238 | #include <linux/errno.h> | |
239 | #include <linux/init.h> | |
240 | #include <linux/slab.h> | |
241 | #include <linux/tty.h> | |
242 | #include <linux/tty_driver.h> | |
243 | #include <linux/tty_flip.h> | |
244 | #include <linux/module.h> | |
245 | #include <linux/spinlock.h> | |
246 | #include <linux/workqueue.h> | |
247 | #include <asm/uaccess.h> | |
248 | #include <linux/usb.h> | |
249 | #include <linux/wait.h> | |
250 | #include "usb-serial.h" | |
251 | ||
252 | /* Defines */ | |
253 | ||
254 | /* | |
255 | * Version Information | |
256 | */ | |
257 | #define DRIVER_VERSION "v1.80.1.2" | |
258 | #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>" | |
259 | #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver" | |
260 | ||
261 | /* port output buffer length -- must be <= transfer buffer length - 2 */ | |
262 | /* so we can be sure to send the full buffer in one urb */ | |
263 | #define DIGI_OUT_BUF_SIZE 8 | |
264 | ||
265 | /* port input buffer length -- must be >= transfer buffer length - 3 */ | |
266 | /* so we can be sure to hold at least one full buffer from one urb */ | |
267 | #define DIGI_IN_BUF_SIZE 64 | |
268 | ||
269 | /* retry timeout while sleeping */ | |
270 | #define DIGI_RETRY_TIMEOUT (HZ/10) | |
271 | ||
272 | /* timeout while waiting for tty output to drain in close */ | |
273 | /* this delay is used twice in close, so the total delay could */ | |
274 | /* be twice this value */ | |
275 | #define DIGI_CLOSE_TIMEOUT (5*HZ) | |
276 | ||
277 | ||
278 | /* AccelePort USB Defines */ | |
279 | ||
280 | /* ids */ | |
281 | #define DIGI_VENDOR_ID 0x05c5 | |
282 | #define DIGI_2_ID 0x0002 /* USB-2 */ | |
283 | #define DIGI_4_ID 0x0004 /* USB-4 */ | |
284 | ||
285 | /* commands | |
286 | * "INB": can be used on the in-band endpoint | |
287 | * "OOB": can be used on the out-of-band endpoint | |
288 | */ | |
289 | #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */ | |
290 | #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */ | |
291 | #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */ | |
292 | #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */ | |
293 | #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */ | |
294 | #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */ | |
295 | #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */ | |
296 | #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */ | |
297 | #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */ | |
298 | #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */ | |
299 | #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */ | |
300 | #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */ | |
301 | #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */ | |
302 | #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */ | |
303 | #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */ | |
304 | #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */ | |
305 | #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */ | |
306 | #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */ | |
307 | #define DIGI_CMD_SEND_DATA 18 /* INB */ | |
308 | #define DIGI_CMD_RECEIVE_DATA 19 /* INB */ | |
309 | #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */ | |
310 | #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */ | |
311 | ||
312 | /* baud rates */ | |
313 | #define DIGI_BAUD_50 0 | |
314 | #define DIGI_BAUD_75 1 | |
315 | #define DIGI_BAUD_110 2 | |
316 | #define DIGI_BAUD_150 3 | |
317 | #define DIGI_BAUD_200 4 | |
318 | #define DIGI_BAUD_300 5 | |
319 | #define DIGI_BAUD_600 6 | |
320 | #define DIGI_BAUD_1200 7 | |
321 | #define DIGI_BAUD_1800 8 | |
322 | #define DIGI_BAUD_2400 9 | |
323 | #define DIGI_BAUD_4800 10 | |
324 | #define DIGI_BAUD_7200 11 | |
325 | #define DIGI_BAUD_9600 12 | |
326 | #define DIGI_BAUD_14400 13 | |
327 | #define DIGI_BAUD_19200 14 | |
328 | #define DIGI_BAUD_28800 15 | |
329 | #define DIGI_BAUD_38400 16 | |
330 | #define DIGI_BAUD_57600 17 | |
331 | #define DIGI_BAUD_76800 18 | |
332 | #define DIGI_BAUD_115200 19 | |
333 | #define DIGI_BAUD_153600 20 | |
334 | #define DIGI_BAUD_230400 21 | |
335 | #define DIGI_BAUD_460800 22 | |
336 | ||
337 | /* arguments */ | |
338 | #define DIGI_WORD_SIZE_5 0 | |
339 | #define DIGI_WORD_SIZE_6 1 | |
340 | #define DIGI_WORD_SIZE_7 2 | |
341 | #define DIGI_WORD_SIZE_8 3 | |
342 | ||
343 | #define DIGI_PARITY_NONE 0 | |
344 | #define DIGI_PARITY_ODD 1 | |
345 | #define DIGI_PARITY_EVEN 2 | |
346 | #define DIGI_PARITY_MARK 3 | |
347 | #define DIGI_PARITY_SPACE 4 | |
348 | ||
349 | #define DIGI_STOP_BITS_1 0 | |
350 | #define DIGI_STOP_BITS_2 1 | |
351 | ||
352 | #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1 | |
353 | #define DIGI_INPUT_FLOW_CONTROL_RTS 2 | |
354 | #define DIGI_INPUT_FLOW_CONTROL_DTR 4 | |
355 | ||
356 | #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1 | |
357 | #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2 | |
358 | #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4 | |
359 | ||
360 | #define DIGI_DTR_INACTIVE 0 | |
361 | #define DIGI_DTR_ACTIVE 1 | |
362 | #define DIGI_DTR_INPUT_FLOW_CONTROL 2 | |
363 | ||
364 | #define DIGI_RTS_INACTIVE 0 | |
365 | #define DIGI_RTS_ACTIVE 1 | |
366 | #define DIGI_RTS_INPUT_FLOW_CONTROL 2 | |
367 | #define DIGI_RTS_TOGGLE 3 | |
368 | ||
369 | #define DIGI_FLUSH_TX 1 | |
370 | #define DIGI_FLUSH_RX 2 | |
371 | #define DIGI_RESUME_TX 4 /* clears xoff condition */ | |
372 | ||
373 | #define DIGI_TRANSMIT_NOT_IDLE 0 | |
374 | #define DIGI_TRANSMIT_IDLE 1 | |
375 | ||
376 | #define DIGI_DISABLE 0 | |
377 | #define DIGI_ENABLE 1 | |
378 | ||
379 | #define DIGI_DEASSERT 0 | |
380 | #define DIGI_ASSERT 1 | |
381 | ||
382 | /* in band status codes */ | |
383 | #define DIGI_OVERRUN_ERROR 4 | |
384 | #define DIGI_PARITY_ERROR 8 | |
385 | #define DIGI_FRAMING_ERROR 16 | |
386 | #define DIGI_BREAK_ERROR 32 | |
387 | ||
388 | /* out of band status */ | |
389 | #define DIGI_NO_ERROR 0 | |
390 | #define DIGI_BAD_FIRST_PARAMETER 1 | |
391 | #define DIGI_BAD_SECOND_PARAMETER 2 | |
392 | #define DIGI_INVALID_LINE 3 | |
393 | #define DIGI_INVALID_OPCODE 4 | |
394 | ||
395 | /* input signals */ | |
396 | #define DIGI_READ_INPUT_SIGNALS_SLOT 1 | |
397 | #define DIGI_READ_INPUT_SIGNALS_ERR 2 | |
398 | #define DIGI_READ_INPUT_SIGNALS_BUSY 4 | |
399 | #define DIGI_READ_INPUT_SIGNALS_PE 8 | |
400 | #define DIGI_READ_INPUT_SIGNALS_CTS 16 | |
401 | #define DIGI_READ_INPUT_SIGNALS_DSR 32 | |
402 | #define DIGI_READ_INPUT_SIGNALS_RI 64 | |
403 | #define DIGI_READ_INPUT_SIGNALS_DCD 128 | |
404 | ||
405 | ||
406 | /* Structures */ | |
407 | ||
408 | struct digi_serial { | |
409 | spinlock_t ds_serial_lock; | |
410 | struct usb_serial_port *ds_oob_port; /* out-of-band port */ | |
411 | int ds_oob_port_num; /* index of out-of-band port */ | |
412 | int ds_device_started; | |
413 | }; | |
414 | ||
415 | struct digi_port { | |
416 | spinlock_t dp_port_lock; | |
417 | int dp_port_num; | |
418 | int dp_out_buf_len; | |
419 | unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE]; | |
420 | int dp_in_buf_len; | |
421 | unsigned char dp_in_buf[DIGI_IN_BUF_SIZE]; | |
422 | unsigned char dp_in_flag_buf[DIGI_IN_BUF_SIZE]; | |
423 | int dp_write_urb_in_use; | |
424 | unsigned int dp_modem_signals; | |
425 | wait_queue_head_t dp_modem_change_wait; | |
426 | int dp_transmit_idle; | |
427 | wait_queue_head_t dp_transmit_idle_wait; | |
428 | int dp_throttled; | |
429 | int dp_throttle_restart; | |
430 | wait_queue_head_t dp_flush_wait; | |
431 | int dp_in_close; /* close in progress */ | |
432 | wait_queue_head_t dp_close_wait; /* wait queue for close */ | |
433 | struct work_struct dp_wakeup_work; | |
434 | }; | |
435 | ||
436 | ||
437 | /* Local Function Declarations */ | |
438 | ||
439 | static void digi_wakeup_write( struct usb_serial_port *port ); | |
440 | static void digi_wakeup_write_lock(void *); | |
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 termios *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, struct pt_regs *regs ); | |
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, struct pt_regs *regs ); | |
469 | static int digi_read_inb_callback( struct urb *urb ); | |
470 | static int digi_read_oob_callback( struct urb *urb ); | |
471 | ||
472 | ||
473 | /* Statics */ | |
474 | ||
475 | static int debug; | |
476 | ||
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 */ | |
481 | }; | |
482 | ||
483 | static struct usb_device_id id_table_2 [] = { | |
484 | { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, | |
485 | { } /* Terminating entry */ | |
486 | }; | |
487 | ||
488 | static struct usb_device_id id_table_4 [] = { | |
489 | { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, | |
490 | { } /* Terminating entry */ | |
491 | }; | |
492 | ||
493 | MODULE_DEVICE_TABLE (usb, id_table_combined); | |
494 | ||
495 | static struct usb_driver digi_driver = { | |
496 | .owner = THIS_MODULE, | |
497 | .name = "digi_acceleport", | |
498 | .probe = usb_serial_probe, | |
499 | .disconnect = usb_serial_disconnect, | |
500 | .id_table = id_table_combined, | |
501 | }; | |
502 | ||
503 | ||
504 | /* device info needed for the Digi serial converter */ | |
505 | ||
506 | static struct usb_serial_device_type digi_acceleport_2_device = { | |
507 | .owner = THIS_MODULE, | |
508 | .name = "Digi 2 port USB adapter", | |
509 | .short_name = "digi_2", | |
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, | |
531 | }; | |
532 | ||
533 | static struct usb_serial_device_type digi_acceleport_4_device = { | |
534 | .owner = THIS_MODULE, | |
535 | .name = "Digi 4 port USB adapter", | |
536 | .short_name = "digi_4", | |
537 | .id_table = id_table_4, | |
538 | .num_interrupt_in = 0, | |
539 | .num_bulk_in = 5, | |
540 | .num_bulk_out = 5, | |
541 | .num_ports = 4, | |
542 | .open = digi_open, | |
543 | .close = digi_close, | |
544 | .write = digi_write, | |
545 | .write_room = digi_write_room, | |
546 | .write_bulk_callback = digi_write_bulk_callback, | |
547 | .read_bulk_callback = digi_read_bulk_callback, | |
548 | .chars_in_buffer = digi_chars_in_buffer, | |
549 | .throttle = digi_rx_throttle, | |
550 | .unthrottle = digi_rx_unthrottle, | |
551 | .ioctl = digi_ioctl, | |
552 | .set_termios = digi_set_termios, | |
553 | .break_ctl = digi_break_ctl, | |
554 | .tiocmget = digi_tiocmget, | |
555 | .tiocmset = digi_tiocmset, | |
556 | .attach = digi_startup, | |
557 | .shutdown = digi_shutdown, | |
558 | }; | |
559 | ||
560 | ||
561 | /* Functions */ | |
562 | ||
563 | /* | |
564 | * Cond Wait Interruptible Timeout Irqrestore | |
565 | * | |
566 | * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout | |
567 | * so that wake ups are not lost if they occur between the unlock | |
568 | * and the sleep. In other words, spin_unlock_irqrestore and | |
569 | * interruptible_sleep_on_timeout are "atomic" with respect to | |
570 | * wake ups. This is used to implement condition variables. | |
571 | */ | |
572 | ||
573 | static inline long cond_wait_interruptible_timeout_irqrestore( | |
574 | wait_queue_head_t *q, long timeout, | |
575 | spinlock_t *lock, unsigned long flags ) | |
576 | { | |
577 | DEFINE_WAIT(wait); | |
578 | ||
579 | prepare_to_wait(q, &wait, TASK_UNINTERRUPTIBLE); | |
580 | spin_unlock_irqrestore(lock, flags); | |
581 | timeout = schedule_timeout(timeout); | |
582 | finish_wait(q, &wait); | |
583 | ||
584 | return timeout; | |
585 | ||
586 | } | |
587 | ||
588 | ||
589 | /* | |
590 | * Digi Wakeup Write | |
591 | * | |
592 | * Wake up port, line discipline, and tty processes sleeping | |
593 | * on writes. | |
594 | */ | |
595 | ||
596 | static void digi_wakeup_write_lock(void *arg) | |
597 | { | |
598 | struct usb_serial_port *port = arg; | |
599 | unsigned long flags; | |
600 | struct digi_port *priv = usb_get_serial_port_data(port); | |
601 | ||
602 | ||
603 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
604 | digi_wakeup_write( port ); | |
605 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
606 | } | |
607 | ||
608 | static void digi_wakeup_write( struct usb_serial_port *port ) | |
609 | { | |
610 | ||
611 | struct tty_struct *tty = port->tty; | |
612 | ||
613 | ||
614 | /* wake up port processes */ | |
615 | wake_up_interruptible( &port->write_wait ); | |
616 | ||
617 | /* wake up line discipline */ | |
618 | tty_wakeup(tty); | |
619 | } | |
620 | ||
621 | ||
622 | /* | |
623 | * Digi Write OOB Command | |
624 | * | |
625 | * Write commands on the out of band port. Commands are 4 | |
626 | * bytes each, multiple commands can be sent at once, and | |
627 | * no command will be split across USB packets. Returns 0 | |
628 | * if successful, -EINTR if interrupted while sleeping and | |
629 | * the interruptible flag is true, or a negative error | |
630 | * returned by usb_submit_urb. | |
631 | */ | |
632 | ||
633 | static int digi_write_oob_command( struct usb_serial_port *port, | |
634 | unsigned char *buf, int count, int interruptible ) | |
635 | { | |
636 | ||
637 | int ret = 0; | |
638 | int len; | |
639 | struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; | |
640 | struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); | |
641 | unsigned long flags = 0; | |
642 | ||
643 | ||
644 | dbg( "digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count ); | |
645 | ||
646 | spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); | |
647 | ||
648 | while( count > 0 ) { | |
649 | ||
650 | while( oob_port->write_urb->status == -EINPROGRESS | |
651 | || oob_priv->dp_write_urb_in_use ) { | |
652 | cond_wait_interruptible_timeout_irqrestore( | |
653 | &oob_port->write_wait, DIGI_RETRY_TIMEOUT, | |
654 | &oob_priv->dp_port_lock, flags ); | |
655 | if( interruptible && signal_pending(current) ) { | |
656 | return( -EINTR ); | |
657 | } | |
658 | spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); | |
659 | } | |
660 | ||
661 | /* len must be a multiple of 4, so commands are not split */ | |
662 | len = min(count, oob_port->bulk_out_size ); | |
663 | if( len > 4 ) | |
664 | len &= ~3; | |
665 | ||
666 | memcpy( oob_port->write_urb->transfer_buffer, buf, len ); | |
667 | oob_port->write_urb->transfer_buffer_length = len; | |
668 | oob_port->write_urb->dev = port->serial->dev; | |
669 | ||
670 | if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) { | |
671 | oob_priv->dp_write_urb_in_use = 1; | |
672 | count -= len; | |
673 | buf += len; | |
674 | } | |
675 | ||
676 | } | |
677 | ||
678 | spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags ); | |
679 | ||
680 | if( ret ) { | |
681 | err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, | |
682 | ret ); | |
683 | } | |
684 | ||
685 | return( ret ); | |
686 | ||
687 | } | |
688 | ||
689 | ||
690 | /* | |
691 | * Digi Write In Band Command | |
692 | * | |
693 | * Write commands on the given port. Commands are 4 | |
694 | * bytes each, multiple commands can be sent at once, and | |
695 | * no command will be split across USB packets. If timeout | |
696 | * is non-zero, write in band command will return after | |
697 | * waiting unsuccessfully for the URB status to clear for | |
698 | * timeout ticks. Returns 0 if successful, or a negative | |
699 | * error returned by digi_write. | |
700 | */ | |
701 | ||
702 | static int digi_write_inb_command( struct usb_serial_port *port, | |
703 | unsigned char *buf, int count, unsigned long timeout ) | |
704 | { | |
705 | ||
706 | int ret = 0; | |
707 | int len; | |
708 | struct digi_port *priv = usb_get_serial_port_data(port); | |
709 | unsigned char *data = port->write_urb->transfer_buffer; | |
710 | unsigned long flags = 0; | |
711 | ||
712 | ||
713 | dbg( "digi_write_inb_command: TOP: port=%d, count=%d", priv->dp_port_num, | |
714 | count ); | |
715 | ||
716 | if( timeout ) | |
717 | timeout += jiffies; | |
718 | else | |
719 | timeout = ULONG_MAX; | |
720 | ||
721 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
722 | ||
723 | while( count > 0 && ret == 0 ) { | |
724 | ||
725 | while( (port->write_urb->status == -EINPROGRESS | |
726 | || priv->dp_write_urb_in_use) && time_before(jiffies, timeout)) { | |
727 | cond_wait_interruptible_timeout_irqrestore( | |
728 | &port->write_wait, DIGI_RETRY_TIMEOUT, | |
729 | &priv->dp_port_lock, flags ); | |
730 | if( signal_pending(current) ) { | |
731 | return( -EINTR ); | |
732 | } | |
733 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
734 | } | |
735 | ||
736 | /* len must be a multiple of 4 and small enough to */ | |
737 | /* guarantee the write will send buffered data first, */ | |
738 | /* so commands are in order with data and not split */ | |
739 | len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len ); | |
740 | if( len > 4 ) | |
741 | len &= ~3; | |
742 | ||
743 | /* write any buffered data first */ | |
744 | if( priv->dp_out_buf_len > 0 ) { | |
745 | data[0] = DIGI_CMD_SEND_DATA; | |
746 | data[1] = priv->dp_out_buf_len; | |
747 | memcpy( data+2, priv->dp_out_buf, | |
748 | priv->dp_out_buf_len ); | |
749 | memcpy( data+2+priv->dp_out_buf_len, buf, len ); | |
750 | port->write_urb->transfer_buffer_length | |
751 | = priv->dp_out_buf_len+2+len; | |
752 | } else { | |
753 | memcpy( data, buf, len ); | |
754 | port->write_urb->transfer_buffer_length = len; | |
755 | } | |
756 | port->write_urb->dev = port->serial->dev; | |
757 | ||
758 | if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) { | |
759 | priv->dp_write_urb_in_use = 1; | |
760 | priv->dp_out_buf_len = 0; | |
761 | count -= len; | |
762 | buf += len; | |
763 | } | |
764 | ||
765 | } | |
766 | ||
767 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
768 | ||
769 | if( ret ) { | |
770 | err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, | |
771 | ret, priv->dp_port_num ); | |
772 | } | |
773 | ||
774 | return( ret ); | |
775 | ||
776 | } | |
777 | ||
778 | ||
779 | /* | |
780 | * Digi Set Modem Signals | |
781 | * | |
782 | * Sets or clears DTR and RTS on the port, according to the | |
783 | * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags | |
784 | * for the modem_signals argument. Returns 0 if successful, | |
785 | * -EINTR if interrupted while sleeping, or a non-zero error | |
786 | * returned by usb_submit_urb. | |
787 | */ | |
788 | ||
789 | static int digi_set_modem_signals( struct usb_serial_port *port, | |
790 | unsigned int modem_signals, int interruptible ) | |
791 | { | |
792 | ||
793 | int ret; | |
794 | struct digi_port *port_priv = usb_get_serial_port_data(port); | |
795 | struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; | |
796 | struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); | |
797 | unsigned char *data = oob_port->write_urb->transfer_buffer; | |
798 | unsigned long flags = 0; | |
799 | ||
800 | ||
801 | dbg( "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x", | |
802 | port_priv->dp_port_num, modem_signals ); | |
803 | ||
804 | spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); | |
805 | spin_lock( &port_priv->dp_port_lock ); | |
806 | ||
807 | while( oob_port->write_urb->status == -EINPROGRESS | |
808 | || oob_priv->dp_write_urb_in_use ) { | |
809 | spin_unlock( &port_priv->dp_port_lock ); | |
810 | cond_wait_interruptible_timeout_irqrestore( | |
811 | &oob_port->write_wait, DIGI_RETRY_TIMEOUT, | |
812 | &oob_priv->dp_port_lock, flags ); | |
813 | if( interruptible && signal_pending(current) ) { | |
814 | return( -EINTR ); | |
815 | } | |
816 | spin_lock_irqsave( &oob_priv->dp_port_lock, flags ); | |
817 | spin_lock( &port_priv->dp_port_lock ); | |
818 | } | |
819 | ||
820 | data[0] = DIGI_CMD_SET_DTR_SIGNAL; | |
821 | data[1] = port_priv->dp_port_num; | |
822 | data[2] = (modem_signals&TIOCM_DTR) ? | |
823 | DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE; | |
824 | data[3] = 0; | |
825 | ||
826 | data[4] = DIGI_CMD_SET_RTS_SIGNAL; | |
827 | data[5] = port_priv->dp_port_num; | |
828 | data[6] = (modem_signals&TIOCM_RTS) ? | |
829 | DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE; | |
830 | data[7] = 0; | |
831 | ||
832 | oob_port->write_urb->transfer_buffer_length = 8; | |
833 | oob_port->write_urb->dev = port->serial->dev; | |
834 | ||
835 | if( (ret=usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0 ) { | |
836 | oob_priv->dp_write_urb_in_use = 1; | |
837 | port_priv->dp_modem_signals = | |
838 | (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS)) | |
839 | | (modem_signals&(TIOCM_DTR|TIOCM_RTS)); | |
840 | } | |
841 | ||
842 | spin_unlock( &port_priv->dp_port_lock ); | |
843 | spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags ); | |
844 | ||
845 | if( ret ) { | |
846 | err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, | |
847 | ret ); | |
848 | } | |
849 | ||
850 | return( ret ); | |
851 | ||
852 | } | |
853 | ||
854 | ||
855 | /* | |
856 | * Digi Transmit Idle | |
857 | * | |
858 | * Digi transmit idle waits, up to timeout ticks, for the transmitter | |
859 | * to go idle. It returns 0 if successful or a negative error. | |
860 | * | |
861 | * There are race conditions here if more than one process is calling | |
862 | * digi_transmit_idle on the same port at the same time. However, this | |
863 | * is only called from close, and only one process can be in close on a | |
864 | * port at a time, so its ok. | |
865 | */ | |
866 | ||
867 | static int digi_transmit_idle( struct usb_serial_port *port, | |
868 | unsigned long timeout ) | |
869 | { | |
870 | ||
871 | int ret; | |
872 | unsigned char buf[2]; | |
873 | struct digi_port *priv = usb_get_serial_port_data(port); | |
874 | unsigned long flags = 0; | |
875 | ||
876 | ||
877 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
878 | priv->dp_transmit_idle = 0; | |
879 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
880 | ||
881 | buf[0] = DIGI_CMD_TRANSMIT_IDLE; | |
882 | buf[1] = 0; | |
883 | ||
884 | timeout += jiffies; | |
885 | ||
886 | if( (ret=digi_write_inb_command( port, buf, 2, timeout-jiffies )) != 0 ) | |
887 | return( ret ); | |
888 | ||
889 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
890 | ||
891 | while( time_before(jiffies, timeout) && !priv->dp_transmit_idle ) { | |
892 | cond_wait_interruptible_timeout_irqrestore( | |
893 | &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT, | |
894 | &priv->dp_port_lock, flags ); | |
895 | if( signal_pending(current) ) { | |
896 | return( -EINTR ); | |
897 | } | |
898 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
899 | } | |
900 | ||
901 | priv->dp_transmit_idle = 0; | |
902 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
903 | ||
904 | return( 0 ); | |
905 | ||
906 | } | |
907 | ||
908 | ||
909 | static void digi_rx_throttle( struct usb_serial_port *port ) | |
910 | { | |
911 | ||
912 | unsigned long flags; | |
913 | struct digi_port *priv = usb_get_serial_port_data(port); | |
914 | ||
915 | ||
916 | dbg( "digi_rx_throttle: TOP: port=%d", priv->dp_port_num ); | |
917 | ||
918 | /* stop receiving characters by not resubmitting the read urb */ | |
919 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
920 | priv->dp_throttled = 1; | |
921 | priv->dp_throttle_restart = 0; | |
922 | priv->dp_in_buf_len = 0; | |
923 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
924 | ||
925 | } | |
926 | ||
927 | ||
928 | static void digi_rx_unthrottle( struct usb_serial_port *port ) | |
929 | { | |
930 | ||
931 | int ret = 0; | |
932 | int len; | |
933 | unsigned long flags; | |
934 | struct digi_port *priv = usb_get_serial_port_data(port); | |
935 | struct tty_struct *tty = port->tty; | |
936 | ||
937 | ||
938 | dbg( "digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num ); | |
939 | ||
940 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
941 | ||
942 | /* send any buffered chars from throttle time on to tty subsystem */ | |
943 | len = min(priv->dp_in_buf_len, TTY_FLIPBUF_SIZE - tty->flip.count ); | |
944 | if( len > 0 ) { | |
945 | memcpy( tty->flip.char_buf_ptr, priv->dp_in_buf, len ); | |
946 | memcpy( tty->flip.flag_buf_ptr, priv->dp_in_flag_buf, len ); | |
947 | tty->flip.char_buf_ptr += len; | |
948 | tty->flip.flag_buf_ptr += len; | |
949 | tty->flip.count += len; | |
950 | tty_flip_buffer_push( tty ); | |
951 | } | |
952 | ||
953 | /* restart read chain */ | |
954 | if( priv->dp_throttle_restart ) { | |
955 | port->read_urb->dev = port->serial->dev; | |
956 | ret = usb_submit_urb( port->read_urb, GFP_ATOMIC ); | |
957 | } | |
958 | ||
959 | /* turn throttle off */ | |
960 | priv->dp_throttled = 0; | |
961 | priv->dp_in_buf_len = 0; | |
962 | priv->dp_throttle_restart = 0; | |
963 | ||
964 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
965 | ||
966 | if( ret ) { | |
967 | err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, | |
968 | ret, priv->dp_port_num ); | |
969 | } | |
970 | ||
971 | } | |
972 | ||
973 | ||
974 | static void digi_set_termios( struct usb_serial_port *port, | |
975 | struct termios *old_termios ) | |
976 | { | |
977 | ||
978 | struct digi_port *priv = usb_get_serial_port_data(port); | |
979 | unsigned int iflag = port->tty->termios->c_iflag; | |
980 | unsigned int cflag = port->tty->termios->c_cflag; | |
981 | unsigned int old_iflag = old_termios->c_iflag; | |
982 | unsigned int old_cflag = old_termios->c_cflag; | |
983 | unsigned char buf[32]; | |
984 | unsigned int modem_signals; | |
985 | int arg,ret; | |
986 | int i = 0; | |
987 | ||
988 | ||
989 | 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 ); | |
990 | ||
991 | /* set baud rate */ | |
992 | if( (cflag&CBAUD) != (old_cflag&CBAUD) ) { | |
993 | ||
994 | arg = -1; | |
995 | ||
996 | /* reassert DTR and (maybe) RTS on transition from B0 */ | |
997 | if( (old_cflag&CBAUD) == B0 ) { | |
998 | /* don't set RTS if using hardware flow control */ | |
999 | /* and throttling input */ | |
1000 | modem_signals = TIOCM_DTR; | |
1001 | if( !(port->tty->termios->c_cflag & CRTSCTS) || | |
1002 | !test_bit(TTY_THROTTLED, &port->tty->flags) ) { | |
1003 | modem_signals |= TIOCM_RTS; | |
1004 | } | |
1005 | digi_set_modem_signals( port, modem_signals, 1 ); | |
1006 | } | |
1007 | ||
1008 | switch( (cflag&CBAUD) ) { | |
1009 | /* drop DTR and RTS on transition to B0 */ | |
1010 | case B0: digi_set_modem_signals( port, 0, 1 ); break; | |
1011 | case B50: arg = DIGI_BAUD_50; break; | |
1012 | case B75: arg = DIGI_BAUD_75; break; | |
1013 | case B110: arg = DIGI_BAUD_110; break; | |
1014 | case B150: arg = DIGI_BAUD_150; break; | |
1015 | case B200: arg = DIGI_BAUD_200; break; | |
1016 | case B300: arg = DIGI_BAUD_300; break; | |
1017 | case B600: arg = DIGI_BAUD_600; break; | |
1018 | case B1200: arg = DIGI_BAUD_1200; break; | |
1019 | case B1800: arg = DIGI_BAUD_1800; break; | |
1020 | case B2400: arg = DIGI_BAUD_2400; break; | |
1021 | case B4800: arg = DIGI_BAUD_4800; break; | |
1022 | case B9600: arg = DIGI_BAUD_9600; break; | |
1023 | case B19200: arg = DIGI_BAUD_19200; break; | |
1024 | case B38400: arg = DIGI_BAUD_38400; break; | |
1025 | case B57600: arg = DIGI_BAUD_57600; break; | |
1026 | case B115200: arg = DIGI_BAUD_115200; break; | |
1027 | case B230400: arg = DIGI_BAUD_230400; break; | |
1028 | case B460800: arg = DIGI_BAUD_460800; break; | |
1029 | default: | |
1030 | dbg( "digi_set_termios: can't handle baud rate 0x%x", | |
1031 | (cflag&CBAUD) ); | |
1032 | break; | |
1033 | } | |
1034 | ||
1035 | if( arg != -1 ) { | |
1036 | buf[i++] = DIGI_CMD_SET_BAUD_RATE; | |
1037 | buf[i++] = priv->dp_port_num; | |
1038 | buf[i++] = arg; | |
1039 | buf[i++] = 0; | |
1040 | } | |
1041 | ||
1042 | } | |
1043 | ||
1044 | /* set parity */ | |
1045 | if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) { | |
1046 | ||
1047 | if( (cflag&PARENB) ) { | |
1048 | if( (cflag&PARODD) ) | |
1049 | arg = DIGI_PARITY_ODD; | |
1050 | else | |
1051 | arg = DIGI_PARITY_EVEN; | |
1052 | } else { | |
1053 | arg = DIGI_PARITY_NONE; | |
1054 | } | |
1055 | ||
1056 | buf[i++] = DIGI_CMD_SET_PARITY; | |
1057 | buf[i++] = priv->dp_port_num; | |
1058 | buf[i++] = arg; | |
1059 | buf[i++] = 0; | |
1060 | ||
1061 | } | |
1062 | ||
1063 | /* set word size */ | |
1064 | if( (cflag&CSIZE) != (old_cflag&CSIZE) ) { | |
1065 | ||
1066 | arg = -1; | |
1067 | ||
1068 | switch( (cflag&CSIZE) ) { | |
1069 | case CS5: arg = DIGI_WORD_SIZE_5; break; | |
1070 | case CS6: arg = DIGI_WORD_SIZE_6; break; | |
1071 | case CS7: arg = DIGI_WORD_SIZE_7; break; | |
1072 | case CS8: arg = DIGI_WORD_SIZE_8; break; | |
1073 | default: | |
1074 | dbg( "digi_set_termios: can't handle word size %d", | |
1075 | (cflag&CSIZE) ); | |
1076 | break; | |
1077 | } | |
1078 | ||
1079 | if( arg != -1 ) { | |
1080 | buf[i++] = DIGI_CMD_SET_WORD_SIZE; | |
1081 | buf[i++] = priv->dp_port_num; | |
1082 | buf[i++] = arg; | |
1083 | buf[i++] = 0; | |
1084 | } | |
1085 | ||
1086 | } | |
1087 | ||
1088 | /* set stop bits */ | |
1089 | if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) { | |
1090 | ||
1091 | if( (cflag&CSTOPB) ) | |
1092 | arg = DIGI_STOP_BITS_2; | |
1093 | else | |
1094 | arg = DIGI_STOP_BITS_1; | |
1095 | ||
1096 | buf[i++] = DIGI_CMD_SET_STOP_BITS; | |
1097 | buf[i++] = priv->dp_port_num; | |
1098 | buf[i++] = arg; | |
1099 | buf[i++] = 0; | |
1100 | ||
1101 | } | |
1102 | ||
1103 | /* set input flow control */ | |
1104 | if( (iflag&IXOFF) != (old_iflag&IXOFF) | |
1105 | || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) { | |
1106 | ||
1107 | arg = 0; | |
1108 | ||
1109 | if( (iflag&IXOFF) ) | |
1110 | arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF; | |
1111 | else | |
1112 | arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF; | |
1113 | ||
1114 | if( (cflag&CRTSCTS) ) { | |
1115 | ||
1116 | arg |= DIGI_INPUT_FLOW_CONTROL_RTS; | |
1117 | ||
1118 | /* On USB-4 it is necessary to assert RTS prior */ | |
1119 | /* to selecting RTS input flow control. */ | |
1120 | buf[i++] = DIGI_CMD_SET_RTS_SIGNAL; | |
1121 | buf[i++] = priv->dp_port_num; | |
1122 | buf[i++] = DIGI_RTS_ACTIVE; | |
1123 | buf[i++] = 0; | |
1124 | ||
1125 | } else { | |
1126 | arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS; | |
1127 | } | |
1128 | ||
1129 | buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; | |
1130 | buf[i++] = priv->dp_port_num; | |
1131 | buf[i++] = arg; | |
1132 | buf[i++] = 0; | |
1133 | ||
1134 | } | |
1135 | ||
1136 | /* set output flow control */ | |
1137 | if( (iflag&IXON) != (old_iflag&IXON) | |
1138 | || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) { | |
1139 | ||
1140 | arg = 0; | |
1141 | ||
1142 | if( (iflag&IXON) ) | |
1143 | arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; | |
1144 | else | |
1145 | arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; | |
1146 | ||
1147 | if( (cflag&CRTSCTS) ) { | |
1148 | arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS; | |
1149 | } else { | |
1150 | arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS; | |
1151 | port->tty->hw_stopped = 0; | |
1152 | } | |
1153 | ||
1154 | buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; | |
1155 | buf[i++] = priv->dp_port_num; | |
1156 | buf[i++] = arg; | |
1157 | buf[i++] = 0; | |
1158 | ||
1159 | } | |
1160 | ||
1161 | /* set receive enable/disable */ | |
1162 | if( (cflag&CREAD) != (old_cflag&CREAD) ) { | |
1163 | ||
1164 | if( (cflag&CREAD) ) | |
1165 | arg = DIGI_ENABLE; | |
1166 | else | |
1167 | arg = DIGI_DISABLE; | |
1168 | ||
1169 | buf[i++] = DIGI_CMD_RECEIVE_ENABLE; | |
1170 | buf[i++] = priv->dp_port_num; | |
1171 | buf[i++] = arg; | |
1172 | buf[i++] = 0; | |
1173 | ||
1174 | } | |
1175 | ||
1176 | if( (ret=digi_write_oob_command( port, buf, i, 1 )) != 0 ) | |
1177 | dbg( "digi_set_termios: write oob failed, ret=%d", ret ); | |
1178 | ||
1179 | } | |
1180 | ||
1181 | ||
1182 | static void digi_break_ctl( struct usb_serial_port *port, int break_state ) | |
1183 | { | |
1184 | ||
1185 | unsigned char buf[4]; | |
1186 | ||
1187 | ||
1188 | buf[0] = DIGI_CMD_BREAK_CONTROL; | |
1189 | buf[1] = 2; /* length */ | |
1190 | buf[2] = break_state ? 1 : 0; | |
1191 | buf[3] = 0; /* pad */ | |
1192 | ||
1193 | digi_write_inb_command( port, buf, 4, 0 ); | |
1194 | ||
1195 | } | |
1196 | ||
1197 | ||
1198 | static int digi_tiocmget( struct usb_serial_port *port, struct file *file ) | |
1199 | { | |
1200 | struct digi_port *priv = usb_get_serial_port_data(port); | |
1201 | unsigned int val; | |
1202 | unsigned long flags; | |
1203 | ||
1204 | dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num); | |
1205 | ||
1206 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
1207 | val = priv->dp_modem_signals; | |
1208 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
1209 | return val; | |
1210 | } | |
1211 | ||
1212 | ||
1213 | static int digi_tiocmset( struct usb_serial_port *port, struct file *file, | |
1214 | unsigned int set, unsigned int clear ) | |
1215 | { | |
1216 | struct digi_port *priv = usb_get_serial_port_data(port); | |
1217 | unsigned int val; | |
1218 | unsigned long flags; | |
1219 | ||
1220 | dbg("%s: TOP: port=%d", __FUNCTION__, priv->dp_port_num); | |
1221 | ||
1222 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
1223 | val = (priv->dp_modem_signals & ~clear) | set; | |
1224 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
1225 | return digi_set_modem_signals( port, val, 1 ); | |
1226 | } | |
1227 | ||
1228 | ||
1229 | static int digi_ioctl( struct usb_serial_port *port, struct file *file, | |
1230 | unsigned int cmd, unsigned long arg ) | |
1231 | { | |
1232 | ||
1233 | struct digi_port *priv = usb_get_serial_port_data(port); | |
1234 | ||
1235 | dbg( "digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd ); | |
1236 | ||
1237 | switch (cmd) { | |
1238 | ||
1239 | case TIOCMIWAIT: | |
1240 | /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/ | |
1241 | /* TODO */ | |
1242 | return( 0 ); | |
1243 | ||
1244 | case TIOCGICOUNT: | |
1245 | /* return count of modemline transitions */ | |
1246 | /* TODO */ | |
1247 | return 0; | |
1248 | ||
1249 | } | |
1250 | ||
1251 | return( -ENOIOCTLCMD ); | |
1252 | ||
1253 | } | |
1254 | ||
1255 | ||
1256 | static int digi_write( struct usb_serial_port *port, const unsigned char *buf, int count ) | |
1257 | { | |
1258 | ||
1259 | int ret,data_len,new_len; | |
1260 | struct digi_port *priv = usb_get_serial_port_data(port); | |
1261 | unsigned char *data = port->write_urb->transfer_buffer; | |
1262 | unsigned long flags = 0; | |
1263 | ||
1264 | ||
1265 | dbg( "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld", | |
1266 | priv->dp_port_num, count, in_interrupt() ); | |
1267 | ||
1268 | /* copy user data (which can sleep) before getting spin lock */ | |
1269 | count = min( count, port->bulk_out_size-2 ); | |
1270 | count = min( 64, count); | |
1271 | ||
1272 | /* be sure only one write proceeds at a time */ | |
1273 | /* there are races on the port private buffer */ | |
1274 | /* and races to check write_urb->status */ | |
1275 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
1276 | ||
1277 | /* wait for urb status clear to submit another urb */ | |
1278 | if( port->write_urb->status == -EINPROGRESS | |
1279 | || priv->dp_write_urb_in_use ) { | |
1280 | ||
1281 | /* buffer data if count is 1 (probably put_char) if possible */ | |
1282 | if( count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE ) { | |
1283 | priv->dp_out_buf[priv->dp_out_buf_len++] = *buf; | |
1284 | new_len = 1; | |
1285 | } else { | |
1286 | new_len = 0; | |
1287 | } | |
1288 | ||
1289 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
1290 | ||
1291 | return( new_len ); | |
1292 | ||
1293 | } | |
1294 | ||
1295 | /* allow space for any buffered data and for new data, up to */ | |
1296 | /* transfer buffer size - 2 (for command and length bytes) */ | |
1297 | new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); | |
1298 | data_len = new_len + priv->dp_out_buf_len; | |
1299 | ||
1300 | if( data_len == 0 ) { | |
1301 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
1302 | return( 0 ); | |
1303 | } | |
1304 | ||
1305 | port->write_urb->transfer_buffer_length = data_len+2; | |
1306 | port->write_urb->dev = port->serial->dev; | |
1307 | ||
1308 | *data++ = DIGI_CMD_SEND_DATA; | |
1309 | *data++ = data_len; | |
1310 | ||
1311 | /* copy in buffered data first */ | |
1312 | memcpy( data, priv->dp_out_buf, priv->dp_out_buf_len ); | |
1313 | data += priv->dp_out_buf_len; | |
1314 | ||
1315 | /* copy in new data */ | |
1316 | memcpy( data, buf, new_len ); | |
1317 | ||
1318 | if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) { | |
1319 | priv->dp_write_urb_in_use = 1; | |
1320 | ret = new_len; | |
1321 | priv->dp_out_buf_len = 0; | |
1322 | } | |
1323 | ||
1324 | /* return length of new data written, or error */ | |
1325 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
1326 | if( ret < 0 ) { | |
1327 | err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, | |
1328 | ret, priv->dp_port_num ); | |
1329 | } | |
1330 | ||
1331 | dbg( "digi_write: returning %d", ret ); | |
1332 | return( ret ); | |
1333 | ||
1334 | } | |
1335 | ||
1336 | ||
1337 | static void digi_write_bulk_callback( struct urb *urb, struct pt_regs *regs ) | |
1338 | { | |
1339 | ||
1340 | struct usb_serial_port *port = (struct usb_serial_port *)urb->context; | |
1341 | struct usb_serial *serial; | |
1342 | struct digi_port *priv; | |
1343 | struct digi_serial *serial_priv; | |
1344 | int ret = 0; | |
1345 | ||
1346 | ||
1347 | dbg( "digi_write_bulk_callback: TOP, urb->status=%d", urb->status ); | |
1348 | ||
1349 | /* port and serial sanity check */ | |
1350 | if( port == NULL || (priv=usb_get_serial_port_data(port)) == NULL ) { | |
1351 | err("%s: port or port->private is NULL, status=%d", __FUNCTION__, | |
1352 | urb->status ); | |
1353 | return; | |
1354 | } | |
1355 | serial = port->serial; | |
1356 | if( serial == NULL || (serial_priv=usb_get_serial_data(serial)) == NULL ) { | |
1357 | err("%s: serial or serial->private is NULL, status=%d", __FUNCTION__, urb->status ); | |
1358 | return; | |
1359 | } | |
1360 | ||
1361 | /* handle oob callback */ | |
1362 | if( priv->dp_port_num == serial_priv->ds_oob_port_num ) { | |
1363 | dbg( "digi_write_bulk_callback: oob callback" ); | |
1364 | spin_lock( &priv->dp_port_lock ); | |
1365 | priv->dp_write_urb_in_use = 0; | |
1366 | wake_up_interruptible( &port->write_wait ); | |
1367 | spin_unlock( &priv->dp_port_lock ); | |
1368 | return; | |
1369 | } | |
1370 | ||
1371 | /* try to send any buffered data on this port, if it is open */ | |
1372 | spin_lock( &priv->dp_port_lock ); | |
1373 | priv->dp_write_urb_in_use = 0; | |
1374 | if( port->open_count && port->write_urb->status != -EINPROGRESS | |
1375 | && priv->dp_out_buf_len > 0 ) { | |
1376 | ||
1377 | *((unsigned char *)(port->write_urb->transfer_buffer)) | |
1378 | = (unsigned char)DIGI_CMD_SEND_DATA; | |
1379 | *((unsigned char *)(port->write_urb->transfer_buffer)+1) | |
1380 | = (unsigned char)priv->dp_out_buf_len; | |
1381 | ||
1382 | port->write_urb->transfer_buffer_length | |
1383 | = priv->dp_out_buf_len+2; | |
1384 | port->write_urb->dev = serial->dev; | |
1385 | ||
1386 | memcpy( port->write_urb->transfer_buffer+2, priv->dp_out_buf, | |
1387 | priv->dp_out_buf_len ); | |
1388 | ||
1389 | if( (ret=usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 0 ) { | |
1390 | priv->dp_write_urb_in_use = 1; | |
1391 | priv->dp_out_buf_len = 0; | |
1392 | } | |
1393 | ||
1394 | } | |
1395 | ||
1396 | /* wake up processes sleeping on writes immediately */ | |
1397 | digi_wakeup_write( port ); | |
1398 | ||
1399 | /* also queue up a wakeup at scheduler time, in case we */ | |
1400 | /* lost the race in write_chan(). */ | |
1401 | schedule_work(&priv->dp_wakeup_work); | |
1402 | ||
1403 | spin_unlock( &priv->dp_port_lock ); | |
1404 | ||
1405 | if( ret ) { | |
1406 | err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, | |
1407 | ret, priv->dp_port_num ); | |
1408 | } | |
1409 | ||
1410 | } | |
1411 | ||
1412 | ||
1413 | static int digi_write_room( struct usb_serial_port *port ) | |
1414 | { | |
1415 | ||
1416 | int room; | |
1417 | struct digi_port *priv = usb_get_serial_port_data(port); | |
1418 | unsigned long flags = 0; | |
1419 | ||
1420 | ||
1421 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
1422 | ||
1423 | if( port->write_urb->status == -EINPROGRESS | |
1424 | || priv->dp_write_urb_in_use ) | |
1425 | room = 0; | |
1426 | else | |
1427 | room = port->bulk_out_size - 2 - priv->dp_out_buf_len; | |
1428 | ||
1429 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
1430 | ||
1431 | dbg( "digi_write_room: port=%d, room=%d", priv->dp_port_num, room ); | |
1432 | return( room ); | |
1433 | ||
1434 | } | |
1435 | ||
1436 | ||
1437 | static int digi_chars_in_buffer( struct usb_serial_port *port ) | |
1438 | { | |
1439 | ||
1440 | struct digi_port *priv = usb_get_serial_port_data(port); | |
1441 | ||
1442 | ||
1443 | if( port->write_urb->status == -EINPROGRESS | |
1444 | || priv->dp_write_urb_in_use ) { | |
1445 | dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, port->bulk_out_size - 2 ); | |
1446 | /* return( port->bulk_out_size - 2 ); */ | |
1447 | return( 256 ); | |
1448 | } else { | |
1449 | dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, priv->dp_out_buf_len ); | |
1450 | return( priv->dp_out_buf_len ); | |
1451 | } | |
1452 | ||
1453 | } | |
1454 | ||
1455 | ||
1456 | static int digi_open( struct usb_serial_port *port, struct file *filp ) | |
1457 | { | |
1458 | ||
1459 | int ret; | |
1460 | unsigned char buf[32]; | |
1461 | struct digi_port *priv = usb_get_serial_port_data(port); | |
1462 | struct termios not_termios; | |
1463 | unsigned long flags = 0; | |
1464 | ||
1465 | ||
1466 | dbg( "digi_open: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count ); | |
1467 | ||
1468 | /* be sure the device is started up */ | |
1469 | if( digi_startup_device( port->serial ) != 0 ) | |
1470 | return( -ENXIO ); | |
1471 | ||
1472 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
1473 | ||
1474 | /* don't wait on a close in progress for non-blocking opens */ | |
1475 | if( priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) { | |
1476 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
1477 | return( -EAGAIN ); | |
1478 | } | |
1479 | ||
1480 | /* wait for a close in progress to finish */ | |
1481 | while( priv->dp_in_close ) { | |
1482 | cond_wait_interruptible_timeout_irqrestore( | |
1483 | &priv->dp_close_wait, DIGI_RETRY_TIMEOUT, | |
1484 | &priv->dp_port_lock, flags ); | |
1485 | if( signal_pending(current) ) { | |
1486 | return( -EINTR ); | |
1487 | } | |
1488 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
1489 | } | |
1490 | ||
1491 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
1492 | ||
1493 | /* read modem signals automatically whenever they change */ | |
1494 | buf[0] = DIGI_CMD_READ_INPUT_SIGNALS; | |
1495 | buf[1] = priv->dp_port_num; | |
1496 | buf[2] = DIGI_ENABLE; | |
1497 | buf[3] = 0; | |
1498 | ||
1499 | /* flush fifos */ | |
1500 | buf[4] = DIGI_CMD_IFLUSH_FIFO; | |
1501 | buf[5] = priv->dp_port_num; | |
1502 | buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; | |
1503 | buf[7] = 0; | |
1504 | ||
1505 | if( (ret=digi_write_oob_command( port, buf, 8, 1 )) != 0 ) | |
1506 | dbg( "digi_open: write oob failed, ret=%d", ret ); | |
1507 | ||
1508 | /* set termios settings */ | |
1509 | not_termios.c_cflag = ~port->tty->termios->c_cflag; | |
1510 | not_termios.c_iflag = ~port->tty->termios->c_iflag; | |
1511 | digi_set_termios( port, ¬_termios ); | |
1512 | ||
1513 | /* set DTR and RTS */ | |
1514 | digi_set_modem_signals( port, TIOCM_DTR|TIOCM_RTS, 1 ); | |
1515 | ||
1516 | return( 0 ); | |
1517 | ||
1518 | } | |
1519 | ||
1520 | ||
1521 | static void digi_close( struct usb_serial_port *port, struct file *filp ) | |
1522 | { | |
1523 | DEFINE_WAIT(wait); | |
1524 | int ret; | |
1525 | unsigned char buf[32]; | |
1526 | struct tty_struct *tty = port->tty; | |
1527 | struct digi_port *priv = usb_get_serial_port_data(port); | |
1528 | unsigned long flags = 0; | |
1529 | ||
1530 | ||
1531 | dbg( "digi_close: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count ); | |
1532 | ||
1533 | ||
1534 | /* if disconnected, just clear flags */ | |
1535 | if (!usb_get_intfdata(port->serial->interface)) | |
1536 | goto exit; | |
1537 | ||
1538 | /* do cleanup only after final close on this port */ | |
1539 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
1540 | priv->dp_in_close = 1; | |
1541 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
1542 | ||
1543 | /* tell line discipline to process only XON/XOFF */ | |
1544 | tty->closing = 1; | |
1545 | ||
1546 | /* wait for output to drain */ | |
1547 | if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) { | |
1548 | tty_wait_until_sent( tty, DIGI_CLOSE_TIMEOUT ); | |
1549 | } | |
1550 | ||
1551 | /* flush driver and line discipline buffers */ | |
1552 | if( tty->driver->flush_buffer ) | |
1553 | tty->driver->flush_buffer( tty ); | |
1554 | tty_ldisc_flush(tty); | |
1555 | ||
1556 | if (port->serial->dev) { | |
1557 | /* wait for transmit idle */ | |
1558 | if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) { | |
1559 | digi_transmit_idle( port, DIGI_CLOSE_TIMEOUT ); | |
1560 | } | |
1561 | ||
1562 | /* drop DTR and RTS */ | |
1563 | digi_set_modem_signals( port, 0, 0 ); | |
1564 | ||
1565 | /* disable input flow control */ | |
1566 | buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; | |
1567 | buf[1] = priv->dp_port_num; | |
1568 | buf[2] = DIGI_DISABLE; | |
1569 | buf[3] = 0; | |
1570 | ||
1571 | /* disable output flow control */ | |
1572 | buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; | |
1573 | buf[5] = priv->dp_port_num; | |
1574 | buf[6] = DIGI_DISABLE; | |
1575 | buf[7] = 0; | |
1576 | ||
1577 | /* disable reading modem signals automatically */ | |
1578 | buf[8] = DIGI_CMD_READ_INPUT_SIGNALS; | |
1579 | buf[9] = priv->dp_port_num; | |
1580 | buf[10] = DIGI_DISABLE; | |
1581 | buf[11] = 0; | |
1582 | ||
1583 | /* disable receive */ | |
1584 | buf[12] = DIGI_CMD_RECEIVE_ENABLE; | |
1585 | buf[13] = priv->dp_port_num; | |
1586 | buf[14] = DIGI_DISABLE; | |
1587 | buf[15] = 0; | |
1588 | ||
1589 | /* flush fifos */ | |
1590 | buf[16] = DIGI_CMD_IFLUSH_FIFO; | |
1591 | buf[17] = priv->dp_port_num; | |
1592 | buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; | |
1593 | buf[19] = 0; | |
1594 | ||
1595 | if( (ret=digi_write_oob_command( port, buf, 20, 0 )) != 0 ) | |
1596 | dbg( "digi_close: write oob failed, ret=%d", ret ); | |
1597 | ||
1598 | /* wait for final commands on oob port to complete */ | |
1599 | prepare_to_wait(&priv->dp_flush_wait, &wait, TASK_UNINTERRUPTIBLE); | |
1600 | schedule_timeout(DIGI_CLOSE_TIMEOUT); | |
1601 | finish_wait(&priv->dp_flush_wait, &wait); | |
1602 | ||
1603 | /* shutdown any outstanding bulk writes */ | |
1604 | usb_kill_urb(port->write_urb); | |
1605 | } | |
1606 | ||
1607 | tty->closing = 0; | |
1608 | ||
1609 | exit: | |
1610 | spin_lock_irqsave( &priv->dp_port_lock, flags ); | |
1611 | priv->dp_write_urb_in_use = 0; | |
1612 | priv->dp_in_close = 0; | |
1613 | wake_up_interruptible( &priv->dp_close_wait ); | |
1614 | spin_unlock_irqrestore( &priv->dp_port_lock, flags ); | |
1615 | ||
1616 | dbg( "digi_close: done" ); | |
1617 | } | |
1618 | ||
1619 | ||
1620 | /* | |
1621 | * Digi Startup Device | |
1622 | * | |
1623 | * Starts reads on all ports. Must be called AFTER startup, with | |
1624 | * urbs initialized. Returns 0 if successful, non-zero error otherwise. | |
1625 | */ | |
1626 | ||
1627 | static int digi_startup_device( struct usb_serial *serial ) | |
1628 | { | |
1629 | ||
1630 | int i,ret = 0; | |
1631 | struct digi_serial *serial_priv = usb_get_serial_data(serial); | |
1632 | struct usb_serial_port *port; | |
1633 | ||
1634 | ||
1635 | /* be sure this happens exactly once */ | |
1636 | spin_lock( &serial_priv->ds_serial_lock ); | |
1637 | if( serial_priv->ds_device_started ) { | |
1638 | spin_unlock( &serial_priv->ds_serial_lock ); | |
1639 | return( 0 ); | |
1640 | } | |
1641 | serial_priv->ds_device_started = 1; | |
1642 | spin_unlock( &serial_priv->ds_serial_lock ); | |
1643 | ||
1644 | /* start reading from each bulk in endpoint for the device */ | |
1645 | /* set USB_DISABLE_SPD flag for write bulk urbs */ | |
1646 | for( i=0; i<serial->type->num_ports+1; i++ ) { | |
1647 | ||
1648 | port = serial->port[i]; | |
1649 | ||
1650 | port->write_urb->dev = port->serial->dev; | |
1651 | ||
1652 | if( (ret=usb_submit_urb(port->read_urb, GFP_KERNEL)) != 0 ) { | |
1653 | err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__, | |
1654 | ret, i ); | |
1655 | break; | |
1656 | } | |
1657 | ||
1658 | } | |
1659 | ||
1660 | return( ret ); | |
1661 | ||
1662 | } | |
1663 | ||
1664 | ||
1665 | static int digi_startup( struct usb_serial *serial ) | |
1666 | { | |
1667 | ||
1668 | int i; | |
1669 | struct digi_port *priv; | |
1670 | struct digi_serial *serial_priv; | |
1671 | ||
1672 | ||
1673 | dbg( "digi_startup: TOP" ); | |
1674 | ||
1675 | /* allocate the private data structures for all ports */ | |
1676 | /* number of regular ports + 1 for the out-of-band port */ | |
1677 | for( i=0; i<serial->type->num_ports+1; i++ ) { | |
1678 | ||
1679 | /* allocate port private structure */ | |
1680 | priv = (struct digi_port *)kmalloc( sizeof(struct digi_port), | |
1681 | GFP_KERNEL ); | |
1682 | if( priv == (struct digi_port *)0 ) { | |
1683 | while( --i >= 0 ) | |
1684 | kfree( usb_get_serial_port_data(serial->port[i]) ); | |
1685 | return( 1 ); /* error */ | |
1686 | } | |
1687 | ||
1688 | /* initialize port private structure */ | |
1689 | spin_lock_init( &priv->dp_port_lock ); | |
1690 | priv->dp_port_num = i; | |
1691 | priv->dp_out_buf_len = 0; | |
1692 | priv->dp_in_buf_len = 0; | |
1693 | priv->dp_write_urb_in_use = 0; | |
1694 | priv->dp_modem_signals = 0; | |
1695 | init_waitqueue_head( &priv->dp_modem_change_wait ); | |
1696 | priv->dp_transmit_idle = 0; | |
1697 | init_waitqueue_head( &priv->dp_transmit_idle_wait ); | |
1698 | priv->dp_throttled = 0; | |
1699 | priv->dp_throttle_restart = 0; | |
1700 | init_waitqueue_head( &priv->dp_flush_wait ); | |
1701 | priv->dp_in_close = 0; | |
1702 | init_waitqueue_head( &priv->dp_close_wait ); | |
1703 | INIT_WORK(&priv->dp_wakeup_work, | |
1704 | digi_wakeup_write_lock, serial->port[i]); | |
1705 | ||
1706 | /* initialize write wait queue for this port */ | |
1707 | init_waitqueue_head( &serial->port[i]->write_wait ); | |
1708 | ||
1709 | usb_set_serial_port_data(serial->port[i], priv); | |
1710 | } | |
1711 | ||
1712 | /* allocate serial private structure */ | |
1713 | serial_priv = (struct digi_serial *)kmalloc( sizeof(struct digi_serial), | |
1714 | GFP_KERNEL ); | |
1715 | if( serial_priv == (struct digi_serial *)0 ) { | |
1716 | for( i=0; i<serial->type->num_ports+1; i++ ) | |
1717 | kfree( usb_get_serial_port_data(serial->port[i]) ); | |
1718 | return( 1 ); /* error */ | |
1719 | } | |
1720 | ||
1721 | /* initialize serial private structure */ | |
1722 | spin_lock_init( &serial_priv->ds_serial_lock ); | |
1723 | serial_priv->ds_oob_port_num = serial->type->num_ports; | |
1724 | serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num]; | |
1725 | serial_priv->ds_device_started = 0; | |
1726 | usb_set_serial_data(serial, serial_priv); | |
1727 | ||
1728 | return( 0 ); | |
1729 | ||
1730 | } | |
1731 | ||
1732 | ||
1733 | static void digi_shutdown( struct usb_serial *serial ) | |
1734 | { | |
1735 | ||
1736 | int i; | |
1737 | ||
1738 | ||
1739 | dbg( "digi_shutdown: TOP, in_interrupt()=%ld", in_interrupt() ); | |
1740 | ||
1741 | /* stop reads and writes on all ports */ | |
1742 | for( i=0; i<serial->type->num_ports+1; i++ ) { | |
1743 | usb_kill_urb(serial->port[i]->read_urb); | |
1744 | usb_kill_urb(serial->port[i]->write_urb); | |
1745 | } | |
1746 | ||
1747 | /* free the private data structures for all ports */ | |
1748 | /* number of regular ports + 1 for the out-of-band port */ | |
1749 | for( i=0; i<serial->type->num_ports+1; i++ ) | |
1750 | kfree( usb_get_serial_port_data(serial->port[i]) ); | |
1751 | kfree( usb_get_serial_data(serial) ); | |
1752 | } | |
1753 | ||
1754 | ||
1755 | static void digi_read_bulk_callback( struct urb *urb, struct pt_regs *regs ) | |
1756 | { | |
1757 | ||
1758 | struct usb_serial_port *port = (struct usb_serial_port *)urb->context; | |
1759 | struct digi_port *priv; | |
1760 | struct digi_serial *serial_priv; | |
1761 | int ret; | |
1762 | ||
1763 | ||
1764 | dbg( "digi_read_bulk_callback: TOP" ); | |
1765 | ||
1766 | /* port sanity check, do not resubmit if port is not valid */ | |
1767 | if( port == NULL || (priv=usb_get_serial_port_data(port)) == NULL ) { | |
1768 | err("%s: port or port->private is NULL, status=%d", __FUNCTION__, | |
1769 | urb->status ); | |
1770 | return; | |
1771 | } | |
1772 | if( port->serial == NULL | |
1773 | || (serial_priv=usb_get_serial_data(port->serial)) == NULL ) { | |
1774 | err("%s: serial is bad or serial->private is NULL, status=%d", __FUNCTION__, urb->status ); | |
1775 | return; | |
1776 | } | |
1777 | ||
1778 | /* do not resubmit urb if it has any status error */ | |
1779 | if( urb->status ) { | |
1780 | err("%s: nonzero read bulk status: status=%d, port=%d", __FUNCTION__, urb->status, priv->dp_port_num ); | |
1781 | return; | |
1782 | } | |
1783 | ||
1784 | /* handle oob or inb callback, do not resubmit if error */ | |
1785 | if( priv->dp_port_num == serial_priv->ds_oob_port_num ) { | |
1786 | if( digi_read_oob_callback( urb ) != 0 ) | |
1787 | return; | |
1788 | } else { | |
1789 | if( digi_read_inb_callback( urb ) != 0 ) | |
1790 | return; | |
1791 | } | |
1792 | ||
1793 | /* continue read */ | |
1794 | urb->dev = port->serial->dev; | |
1795 | if( (ret=usb_submit_urb(urb, GFP_ATOMIC)) != 0 ) { | |
1796 | err("%s: failed resubmitting urb, ret=%d, port=%d", __FUNCTION__, | |
1797 | ret, priv->dp_port_num ); | |
1798 | } | |
1799 | ||
1800 | } | |
1801 | ||
1802 | ||
1803 | /* | |
1804 | * Digi Read INB Callback | |
1805 | * | |
1806 | * Digi Read INB Callback handles reads on the in band ports, sending | |
1807 | * the data on to the tty subsystem. When called we know port and | |
1808 | * port->private are not NULL and port->serial has been validated. | |
1809 | * It returns 0 if successful, 1 if successful but the port is | |
1810 | * throttled, and -1 if the sanity checks failed. | |
1811 | */ | |
1812 | ||
1813 | static int digi_read_inb_callback( struct urb *urb ) | |
1814 | { | |
1815 | ||
1816 | struct usb_serial_port *port = (struct usb_serial_port *)urb->context; | |
1817 | struct tty_struct *tty = port->tty; | |
1818 | struct digi_port *priv = usb_get_serial_port_data(port); | |
1819 | int opcode = ((unsigned char *)urb->transfer_buffer)[0]; | |
1820 | int len = ((unsigned char *)urb->transfer_buffer)[1]; | |
1821 | int status = ((unsigned char *)urb->transfer_buffer)[2]; | |
1822 | unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3; | |
1823 | int flag,throttled; | |
1824 | ||
1825 | /* do not process callbacks on closed ports */ | |
1826 | /* but do continue the read chain */ | |
1827 | if( port->open_count == 0 ) | |
1828 | return( 0 ); | |
1829 | ||
1830 | /* short/multiple packet check */ | |
1831 | if( urb->actual_length != len + 2 ) { | |
1832 | 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 ); | |
1833 | return( -1 ); | |
1834 | } | |
1835 | ||
1836 | spin_lock( &priv->dp_port_lock ); | |
1837 | ||
1838 | /* check for throttle; if set, do not resubmit read urb */ | |
1839 | /* indicate the read chain needs to be restarted on unthrottle */ | |
1840 | throttled = priv->dp_throttled; | |
1841 | if( throttled ) | |
1842 | priv->dp_throttle_restart = 1; | |
1843 | ||
1844 | /* receive data */ | |
1845 | if( opcode == DIGI_CMD_RECEIVE_DATA ) { | |
1846 | ||
1847 | /* get flag from status */ | |
1848 | flag = 0; | |
1849 | ||
1850 | /* overrun is special, not associated with a char */ | |
1851 | if( status & DIGI_OVERRUN_ERROR ) { | |
1852 | tty_insert_flip_char( tty, 0, TTY_OVERRUN ); | |
1853 | } | |
1854 | ||
1855 | /* break takes precedence over parity, */ | |
1856 | /* which takes precedence over framing errors */ | |
1857 | if( status & DIGI_BREAK_ERROR ) { | |
1858 | flag = TTY_BREAK; | |
1859 | } else if( status & DIGI_PARITY_ERROR ) { | |
1860 | flag = TTY_PARITY; | |
1861 | } else if( status & DIGI_FRAMING_ERROR ) { | |
1862 | flag = TTY_FRAME; | |
1863 | } | |
1864 | ||
1865 | /* data length is len-1 (one byte of len is status) */ | |
1866 | --len; | |
1867 | ||
1868 | if( throttled ) { | |
1869 | ||
1870 | len = min( len, | |
1871 | DIGI_IN_BUF_SIZE - priv->dp_in_buf_len ); | |
1872 | ||
1873 | if( len > 0 ) { | |
1874 | memcpy( priv->dp_in_buf + priv->dp_in_buf_len, | |
1875 | data, len ); | |
1876 | memset( priv->dp_in_flag_buf | |
1877 | + priv->dp_in_buf_len, flag, len ); | |
1878 | priv->dp_in_buf_len += len; | |
1879 | } | |
1880 | ||
1881 | } else { | |
1882 | ||
1883 | len = min( len, TTY_FLIPBUF_SIZE - tty->flip.count ); | |
1884 | ||
1885 | if( len > 0 ) { | |
1886 | memcpy( tty->flip.char_buf_ptr, data, len ); | |
1887 | memset( tty->flip.flag_buf_ptr, flag, len ); | |
1888 | tty->flip.char_buf_ptr += len; | |
1889 | tty->flip.flag_buf_ptr += len; | |
1890 | tty->flip.count += len; | |
1891 | tty_flip_buffer_push( tty ); | |
1892 | } | |
1893 | ||
1894 | } | |
1895 | ||
1896 | } | |
1897 | ||
1898 | spin_unlock( &priv->dp_port_lock ); | |
1899 | ||
1900 | if( opcode == DIGI_CMD_RECEIVE_DISABLE ) { | |
1901 | dbg("%s: got RECEIVE_DISABLE", __FUNCTION__ ); | |
1902 | } else if( opcode != DIGI_CMD_RECEIVE_DATA ) { | |
1903 | dbg("%s: unknown opcode: %d", __FUNCTION__, opcode ); | |
1904 | } | |
1905 | ||
1906 | return( throttled ? 1 : 0 ); | |
1907 | ||
1908 | } | |
1909 | ||
1910 | ||
1911 | /* | |
1912 | * Digi Read OOB Callback | |
1913 | * | |
1914 | * Digi Read OOB Callback handles reads on the out of band port. | |
1915 | * When called we know port and port->private are not NULL and | |
1916 | * the port->serial is valid. It returns 0 if successful, and | |
1917 | * -1 if the sanity checks failed. | |
1918 | */ | |
1919 | ||
1920 | static int digi_read_oob_callback( struct urb *urb ) | |
1921 | { | |
1922 | ||
1923 | struct usb_serial_port *port = (struct usb_serial_port *)urb->context; | |
1924 | struct usb_serial *serial = port->serial; | |
1925 | struct digi_port *priv = usb_get_serial_port_data(port); | |
1926 | int opcode, line, status, val; | |
1927 | int i; | |
1928 | ||
1929 | ||
1930 | dbg( "digi_read_oob_callback: port=%d, len=%d", priv->dp_port_num, | |
1931 | urb->actual_length ); | |
1932 | ||
1933 | /* handle each oob command */ | |
1934 | for( i=0; i<urb->actual_length-3; ) { | |
1935 | ||
1936 | opcode = ((unsigned char *)urb->transfer_buffer)[i++]; | |
1937 | line = ((unsigned char *)urb->transfer_buffer)[i++]; | |
1938 | status = ((unsigned char *)urb->transfer_buffer)[i++]; | |
1939 | val = ((unsigned char *)urb->transfer_buffer)[i++]; | |
1940 | ||
1941 | dbg( "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d", | |
1942 | opcode, line, status, val ); | |
1943 | ||
1944 | if( status != 0 || line >= serial->type->num_ports ) | |
1945 | continue; | |
1946 | ||
1947 | port = serial->port[line]; | |
1948 | ||
1949 | if ((priv=usb_get_serial_port_data(port)) == NULL ) | |
1950 | return -1; | |
1951 | ||
1952 | if( opcode == DIGI_CMD_READ_INPUT_SIGNALS ) { | |
1953 | ||
1954 | spin_lock( &priv->dp_port_lock ); | |
1955 | ||
1956 | /* convert from digi flags to termiox flags */ | |
1957 | if( val & DIGI_READ_INPUT_SIGNALS_CTS ) { | |
1958 | priv->dp_modem_signals |= TIOCM_CTS; | |
1959 | /* port must be open to use tty struct */ | |
1960 | if( port->open_count | |
1961 | && port->tty->termios->c_cflag & CRTSCTS ) { | |
1962 | port->tty->hw_stopped = 0; | |
1963 | digi_wakeup_write( port ); | |
1964 | } | |
1965 | } else { | |
1966 | priv->dp_modem_signals &= ~TIOCM_CTS; | |
1967 | /* port must be open to use tty struct */ | |
1968 | if( port->open_count | |
1969 | && port->tty->termios->c_cflag & CRTSCTS ) { | |
1970 | port->tty->hw_stopped = 1; | |
1971 | } | |
1972 | } | |
1973 | if( val & DIGI_READ_INPUT_SIGNALS_DSR ) | |
1974 | priv->dp_modem_signals |= TIOCM_DSR; | |
1975 | else | |
1976 | priv->dp_modem_signals &= ~TIOCM_DSR; | |
1977 | if( val & DIGI_READ_INPUT_SIGNALS_RI ) | |
1978 | priv->dp_modem_signals |= TIOCM_RI; | |
1979 | else | |
1980 | priv->dp_modem_signals &= ~TIOCM_RI; | |
1981 | if( val & DIGI_READ_INPUT_SIGNALS_DCD ) | |
1982 | priv->dp_modem_signals |= TIOCM_CD; | |
1983 | else | |
1984 | priv->dp_modem_signals &= ~TIOCM_CD; | |
1985 | ||
1986 | wake_up_interruptible( &priv->dp_modem_change_wait ); | |
1987 | spin_unlock( &priv->dp_port_lock ); | |
1988 | ||
1989 | } else if( opcode == DIGI_CMD_TRANSMIT_IDLE ) { | |
1990 | ||
1991 | spin_lock( &priv->dp_port_lock ); | |
1992 | priv->dp_transmit_idle = 1; | |
1993 | wake_up_interruptible( &priv->dp_transmit_idle_wait ); | |
1994 | spin_unlock( &priv->dp_port_lock ); | |
1995 | ||
1996 | } else if( opcode == DIGI_CMD_IFLUSH_FIFO ) { | |
1997 | ||
1998 | wake_up( &priv->dp_flush_wait ); | |
1999 | ||
2000 | } | |
2001 | ||
2002 | } | |
2003 | ||
2004 | return( 0 ); | |
2005 | ||
2006 | } | |
2007 | ||
2008 | ||
2009 | static int __init digi_init (void) | |
2010 | { | |
2011 | int retval; | |
2012 | retval = usb_serial_register(&digi_acceleport_2_device); | |
2013 | if (retval) | |
2014 | goto failed_acceleport_2_device; | |
2015 | retval = usb_serial_register(&digi_acceleport_4_device); | |
2016 | if (retval) | |
2017 | goto failed_acceleport_4_device; | |
2018 | retval = usb_register(&digi_driver); | |
2019 | if (retval) | |
2020 | goto failed_usb_register; | |
2021 | info(DRIVER_VERSION ":" DRIVER_DESC); | |
2022 | return 0; | |
2023 | failed_usb_register: | |
2024 | usb_serial_deregister(&digi_acceleport_4_device); | |
2025 | failed_acceleport_4_device: | |
2026 | usb_serial_deregister(&digi_acceleport_2_device); | |
2027 | failed_acceleport_2_device: | |
2028 | return retval; | |
2029 | } | |
2030 | ||
2031 | ||
2032 | static void __exit digi_exit (void) | |
2033 | { | |
2034 | usb_deregister (&digi_driver); | |
2035 | usb_serial_deregister (&digi_acceleport_2_device); | |
2036 | usb_serial_deregister (&digi_acceleport_4_device); | |
2037 | } | |
2038 | ||
2039 | ||
2040 | module_init(digi_init); | |
2041 | module_exit(digi_exit); | |
2042 | ||
2043 | ||
2044 | MODULE_AUTHOR( DRIVER_AUTHOR ); | |
2045 | MODULE_DESCRIPTION( DRIVER_DESC ); | |
2046 | MODULE_LICENSE("GPL"); | |
2047 | ||
2048 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
2049 | MODULE_PARM_DESC(debug, "Debug enabled or not"); |