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_lock_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/tqueue.h>
247 #include <asm/uaccess.h>
248 #include <linux/usb.h>
249
250 #ifdef CONFIG_USB_SERIAL_DEBUG
251 static int debug = 1;
252 #else
253 static int debug;
254 #endif
255
256 #include "usb-serial.h"
257
258
259 /* Defines */
260
261 /*
262 * Version Information
263 */
264 #define DRIVER_VERSION "v1.80.1.2"
265 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
266 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
267
268 /* port output buffer length -- must be <= transfer buffer length - 2 */
269 /* so we can be sure to send the full buffer in one urb */
270 #define DIGI_OUT_BUF_SIZE 8
271
272 /* port input buffer length -- must be >= transfer buffer length - 3 */
273 /* so we can be sure to hold at least one full buffer from one urb */
274 #define DIGI_IN_BUF_SIZE 64
275
276 /* retry timeout while sleeping */
277 #define DIGI_RETRY_TIMEOUT (HZ/10)
278
279 /* timeout while waiting for tty output to drain in close */
280 /* this delay is used twice in close, so the total delay could */
281 /* be twice this value */
282 #define DIGI_CLOSE_TIMEOUT (5*HZ)
283
284
285 /* AccelePort USB Defines */
286
287 /* ids */
288 #define DIGI_VENDOR_ID 0x05c5
289 #define DIGI_2_ID 0x0002 /* USB-2 */
290 #define DIGI_4_ID 0x0004 /* USB-4 */
291
292 /* commands
293 * "INB": can be used on the in-band endpoint
294 * "OOB": can be used on the out-of-band endpoint
295 */
296 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
297 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
298 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
299 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
300 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
301 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
302 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
303 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
304 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
305 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
306 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
307 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
308 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
309 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
310 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
311 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
312 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
313 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
314 #define DIGI_CMD_SEND_DATA 18 /* INB */
315 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */
316 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
317 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
318
319 /* baud rates */
320 #define DIGI_BAUD_50 0
321 #define DIGI_BAUD_75 1
322 #define DIGI_BAUD_110 2
323 #define DIGI_BAUD_150 3
324 #define DIGI_BAUD_200 4
325 #define DIGI_BAUD_300 5
326 #define DIGI_BAUD_600 6
327 #define DIGI_BAUD_1200 7
328 #define DIGI_BAUD_1800 8
329 #define DIGI_BAUD_2400 9
330 #define DIGI_BAUD_4800 10
331 #define DIGI_BAUD_7200 11
332 #define DIGI_BAUD_9600 12
333 #define DIGI_BAUD_14400 13
334 #define DIGI_BAUD_19200 14
335 #define DIGI_BAUD_28800 15
336 #define DIGI_BAUD_38400 16
337 #define DIGI_BAUD_57600 17
338 #define DIGI_BAUD_76800 18
339 #define DIGI_BAUD_115200 19
340 #define DIGI_BAUD_153600 20
341 #define DIGI_BAUD_230400 21
342 #define DIGI_BAUD_460800 22
343
344 /* arguments */
345 #define DIGI_WORD_SIZE_5 0
346 #define DIGI_WORD_SIZE_6 1
347 #define DIGI_WORD_SIZE_7 2
348 #define DIGI_WORD_SIZE_8 3
349
350 #define DIGI_PARITY_NONE 0
351 #define DIGI_PARITY_ODD 1
352 #define DIGI_PARITY_EVEN 2
353 #define DIGI_PARITY_MARK 3
354 #define DIGI_PARITY_SPACE 4
355
356 #define DIGI_STOP_BITS_1 0
357 #define DIGI_STOP_BITS_2 1
358
359 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
360 #define DIGI_INPUT_FLOW_CONTROL_RTS 2
361 #define DIGI_INPUT_FLOW_CONTROL_DTR 4
362
363 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
364 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
365 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
366
367 #define DIGI_DTR_INACTIVE 0
368 #define DIGI_DTR_ACTIVE 1
369 #define DIGI_DTR_INPUT_FLOW_CONTROL 2
370
371 #define DIGI_RTS_INACTIVE 0
372 #define DIGI_RTS_ACTIVE 1
373 #define DIGI_RTS_INPUT_FLOW_CONTROL 2
374 #define DIGI_RTS_TOGGLE 3
375
376 #define DIGI_FLUSH_TX 1
377 #define DIGI_FLUSH_RX 2
378 #define DIGI_RESUME_TX 4 /* clears xoff condition */
379
380 #define DIGI_TRANSMIT_NOT_IDLE 0
381 #define DIGI_TRANSMIT_IDLE 1
382
383 #define DIGI_DISABLE 0
384 #define DIGI_ENABLE 1
385
386 #define DIGI_DEASSERT 0
387 #define DIGI_ASSERT 1
388
389 /* in band status codes */
390 #define DIGI_OVERRUN_ERROR 4
391 #define DIGI_PARITY_ERROR 8
392 #define DIGI_FRAMING_ERROR 16
393 #define DIGI_BREAK_ERROR 32
394
395 /* out of band status */
396 #define DIGI_NO_ERROR 0
397 #define DIGI_BAD_FIRST_PARAMETER 1
398 #define DIGI_BAD_SECOND_PARAMETER 2
399 #define DIGI_INVALID_LINE 3
400 #define DIGI_INVALID_OPCODE 4
401
402 /* input signals */
403 #define DIGI_READ_INPUT_SIGNALS_SLOT 1
404 #define DIGI_READ_INPUT_SIGNALS_ERR 2
405 #define DIGI_READ_INPUT_SIGNALS_BUSY 4
406 #define DIGI_READ_INPUT_SIGNALS_PE 8
407 #define DIGI_READ_INPUT_SIGNALS_CTS 16
408 #define DIGI_READ_INPUT_SIGNALS_DSR 32
409 #define DIGI_READ_INPUT_SIGNALS_RI 64
410 #define DIGI_READ_INPUT_SIGNALS_DCD 128
411
412
413 /* Structures */
414
415 struct digi_serial {
416 spinlock_t ds_serial_lock;
417 struct usb_serial_port *ds_oob_port; /* out-of-band port */
418 int ds_oob_port_num; /* index of out-of-band port */
419 int ds_device_started;
420 };
421
422 struct digi_port {
423 spinlock_t dp_port_lock;
424 int dp_port_num;
425 int dp_out_buf_len;
426 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
427 int dp_in_buf_len;
428 unsigned char dp_in_buf[DIGI_IN_BUF_SIZE];
429 unsigned char dp_in_flag_buf[DIGI_IN_BUF_SIZE];
430 int dp_write_urb_in_use;
431 unsigned int dp_modem_signals;
432 wait_queue_head_t dp_modem_change_wait;
433 int dp_transmit_idle;
434 wait_queue_head_t dp_transmit_idle_wait;
435 int dp_throttled;
436 int dp_throttle_restart;
437 wait_queue_head_t dp_flush_wait;
438 int dp_in_close; /* close in progress */
439 wait_queue_head_t dp_close_wait; /* wait queue for close */
440 struct tq_struct dp_wakeup_task;
441 };
442
443
444 /* Local Function Declarations */
445
446 static void digi_wakeup_write( struct usb_serial_port *port );
447 static void digi_wakeup_write_lock( struct usb_serial_port *port );
448 static int digi_write_oob_command( struct usb_serial_port *port,
449 unsigned char *buf, int count, int interruptible );
450 static int digi_write_inb_command( struct usb_serial_port *port,
451 unsigned char *buf, int count, unsigned long timeout );
452 static int digi_set_modem_signals( struct usb_serial_port *port,
453 unsigned int modem_signals, int interruptible );
454 static int digi_transmit_idle( struct usb_serial_port *port,
455 unsigned long timeout );
456 static void digi_rx_throttle (struct usb_serial_port *port);
457 static void digi_rx_unthrottle (struct usb_serial_port *port);
458 static void digi_set_termios( struct usb_serial_port *port,
459 struct termios *old_termios );
460 static void digi_break_ctl( struct usb_serial_port *port, int break_state );
461 static int digi_ioctl( struct usb_serial_port *port, struct file *file,
462 unsigned int cmd, unsigned long arg );
463 static int digi_write( struct usb_serial_port *port, int from_user,
464 const unsigned char *buf, int count );
465 static void digi_write_bulk_callback( struct urb *urb );
466 static int digi_write_room( struct usb_serial_port *port );
467 static int digi_chars_in_buffer( struct usb_serial_port *port );
468 static int digi_open( struct usb_serial_port *port, struct file *filp );
469 static void digi_close( struct usb_serial_port *port, struct file *filp );
470 static int digi_startup_device( struct usb_serial *serial );
471 static int digi_startup( struct usb_serial *serial );
472 static void digi_shutdown( struct usb_serial *serial );
473 static void digi_read_bulk_callback( struct urb *urb );
474 static int digi_read_inb_callback( struct urb *urb );
475 static int digi_read_oob_callback( struct urb *urb );
476
477
478 /* Statics */
479
480 static __devinitdata struct usb_device_id id_table_combined [] = {
481 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
482 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
483 { } /* Terminating entry */
484 };
485
486 static struct usb_device_id id_table_2 [] = {
487 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
488 { } /* Terminating entry */
489 };
490
491 static struct usb_device_id id_table_4 [] = {
492 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
493 { } /* Terminating entry */
494 };
495
496 MODULE_DEVICE_TABLE (usb, id_table_combined);
497
498 /* device info needed for the Digi serial converter */
499
500 static struct usb_serial_device_type digi_acceleport_2_device = {
501 .owner = THIS_MODULE,
502 .name = "Digi USB",
503 .id_table = id_table_2,
504 .num_interrupt_in = 0,
505 .num_bulk_in = 4,
506 .num_bulk_out = 4,
507 .num_ports = 3,
508 .open = digi_open,
509 .close = digi_close,
510 .write = digi_write,
511 .write_room = digi_write_room,
512 .write_bulk_callback = digi_write_bulk_callback,
513 .read_bulk_callback = digi_read_bulk_callback,
514 .chars_in_buffer = digi_chars_in_buffer,
515 .throttle = digi_rx_throttle,
516 .unthrottle = digi_rx_unthrottle,
517 .ioctl = digi_ioctl,
518 .set_termios = digi_set_termios,
519 .break_ctl = digi_break_ctl,
520 .startup = digi_startup,
521 .shutdown = digi_shutdown,
522 };
523
524 static struct usb_serial_device_type digi_acceleport_4_device = {
525 .owner = THIS_MODULE,
526 .name = "Digi USB",
527 .id_table = id_table_4,
528 .num_interrupt_in = 0,
529 .num_bulk_in = 5,
530 .num_bulk_out = 5,
531 .num_ports = 4,
532 .open = digi_open,
533 .close = digi_close,
534 .write = digi_write,
535 .write_room = digi_write_room,
536 .write_bulk_callback = digi_write_bulk_callback,
537 .read_bulk_callback = digi_read_bulk_callback,
538 .chars_in_buffer = digi_chars_in_buffer,
539 .throttle = digi_rx_throttle,
540 .unthrottle = digi_rx_unthrottle,
541 .ioctl = digi_ioctl,
542 .set_termios = digi_set_termios,
543 .break_ctl = digi_break_ctl,
544 .startup = digi_startup,
545 .shutdown = digi_shutdown,
546 };
547
548
549 /* Functions */
550
551 /*
552 * Cond Wait Interruptible Timeout Irqrestore
553 *
554 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
555 * so that wake ups are not lost if they occur between the unlock
556 * and the sleep. In other words, spin_lock_irqrestore and
557 * interruptible_sleep_on_timeout are "atomic" with respect to
558 * wake ups. This is used to implement condition variables.
559 */
560
cond_wait_interruptible_timeout_irqrestore(wait_queue_head_t * q,long timeout,spinlock_t * lock,unsigned long flags)561 static inline long cond_wait_interruptible_timeout_irqrestore(
562 wait_queue_head_t *q, long timeout,
563 spinlock_t *lock, unsigned long flags )
564 {
565
566 wait_queue_t wait;
567
568
569 init_waitqueue_entry( &wait, current );
570
571 set_current_state( TASK_INTERRUPTIBLE );
572
573 add_wait_queue( q, &wait );
574
575 spin_unlock_irqrestore( lock, flags );
576
577 timeout = schedule_timeout(timeout);
578
579 set_current_state( TASK_RUNNING );
580
581 remove_wait_queue( q, &wait );
582
583 return( timeout );
584
585 }
586
587
588 /*
589 * Digi Wakeup Write
590 *
591 * Wake up port, line discipline, and tty processes sleeping
592 * on writes.
593 */
594
digi_wakeup_write_lock(struct usb_serial_port * port)595 static void digi_wakeup_write_lock( struct usb_serial_port *port )
596 {
597
598 unsigned long flags;
599 struct digi_port *priv = (struct digi_port *)(port->private);
600
601
602 spin_lock_irqsave( &priv->dp_port_lock, flags );
603 digi_wakeup_write( port );
604 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
605 }
606
digi_wakeup_write(struct usb_serial_port * port)607 static void digi_wakeup_write( struct usb_serial_port *port )
608 {
609
610 struct tty_struct *tty = port->tty;
611
612
613 /* wake up port processes */
614 wake_up_interruptible( &port->write_wait );
615
616 /* wake up line discipline */
617 tty_wakeup(tty);
618 }
619
620
621 /*
622 * Digi Write OOB Command
623 *
624 * Write commands on the out of band port. Commands are 4
625 * bytes each, multiple commands can be sent at once, and
626 * no command will be split across USB packets. Returns 0
627 * if successful, -EINTR if interrupted while sleeping and
628 * the interruptible flag is true, or a negative error
629 * returned by usb_submit_urb.
630 */
631
digi_write_oob_command(struct usb_serial_port * port,unsigned char * buf,int count,int interruptible)632 static int digi_write_oob_command( struct usb_serial_port *port,
633 unsigned char *buf, int count, int interruptible )
634 {
635
636 int ret = 0;
637 int len;
638 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)port->serial->private)->ds_oob_port;
639 struct digi_port *oob_priv = (struct digi_port *)oob_port->private;
640 unsigned long flags = 0;
641
642
643 dbg( "digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count );
644
645 spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
646
647 while( count > 0 ) {
648
649 while( oob_port->write_urb->status == -EINPROGRESS
650 || oob_priv->dp_write_urb_in_use ) {
651 cond_wait_interruptible_timeout_irqrestore(
652 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
653 &oob_priv->dp_port_lock, flags );
654 if( interruptible && signal_pending(current) ) {
655 return( -EINTR );
656 }
657 spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
658 }
659
660 /* len must be a multiple of 4, so commands are not split */
661 len = min(count, oob_port->bulk_out_size );
662 if( len > 4 )
663 len &= ~3;
664
665 memcpy( oob_port->write_urb->transfer_buffer, buf, len );
666 oob_port->write_urb->transfer_buffer_length = len;
667 oob_port->write_urb->dev = port->serial->dev;
668
669 if( (ret=usb_submit_urb(oob_port->write_urb)) == 0 ) {
670 oob_priv->dp_write_urb_in_use = 1;
671 count -= len;
672 buf += len;
673 }
674
675 }
676
677 spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags );
678
679 if( ret ) {
680 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__,
681 ret );
682 }
683
684 return( ret );
685
686 }
687
688
689 /*
690 * Digi Write In Band Command
691 *
692 * Write commands on the given port. Commands are 4
693 * bytes each, multiple commands can be sent at once, and
694 * no command will be split across USB packets. If timeout
695 * is non-zero, write in band command will return after
696 * waiting unsuccessfully for the URB status to clear for
697 * timeout ticks. Returns 0 if successful, or a negative
698 * error returned by digi_write.
699 */
700
digi_write_inb_command(struct usb_serial_port * port,unsigned char * buf,int count,unsigned long timeout)701 static int digi_write_inb_command( struct usb_serial_port *port,
702 unsigned char *buf, int count, unsigned long timeout )
703 {
704
705 int ret = 0;
706 int len;
707 struct digi_port *priv = (struct digi_port *)(port->private);
708 unsigned char *data = port->write_urb->transfer_buffer;
709 unsigned long flags = 0;
710
711
712 dbg( "digi_write_inb_command: TOP: port=%d, count=%d", priv->dp_port_num,
713 count );
714
715 if( timeout )
716 timeout += jiffies;
717 else
718 timeout = ULONG_MAX;
719
720 spin_lock_irqsave( &priv->dp_port_lock, flags );
721
722 while( count > 0 && ret == 0 ) {
723
724 while( (port->write_urb->status == -EINPROGRESS
725 || priv->dp_write_urb_in_use) && time_before(jiffies, timeout)) {
726 cond_wait_interruptible_timeout_irqrestore(
727 &port->write_wait, DIGI_RETRY_TIMEOUT,
728 &priv->dp_port_lock, flags );
729 if( signal_pending(current) ) {
730 return( -EINTR );
731 }
732 spin_lock_irqsave( &priv->dp_port_lock, flags );
733 }
734
735 /* len must be a multiple of 4 and small enough to */
736 /* guarantee the write will send buffered data first, */
737 /* so commands are in order with data and not split */
738 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len );
739 if( len > 4 )
740 len &= ~3;
741
742 /* write any buffered data first */
743 if( priv->dp_out_buf_len > 0 ) {
744 data[0] = DIGI_CMD_SEND_DATA;
745 data[1] = priv->dp_out_buf_len;
746 memcpy( data+2, priv->dp_out_buf,
747 priv->dp_out_buf_len );
748 memcpy( data+2+priv->dp_out_buf_len, buf, len );
749 port->write_urb->transfer_buffer_length
750 = priv->dp_out_buf_len+2+len;
751 } else {
752 memcpy( data, buf, len );
753 port->write_urb->transfer_buffer_length = len;
754 }
755 port->write_urb->dev = port->serial->dev;
756
757 if( (ret=usb_submit_urb(port->write_urb)) == 0 ) {
758 priv->dp_write_urb_in_use = 1;
759 priv->dp_out_buf_len = 0;
760 count -= len;
761 buf += len;
762 }
763
764 }
765
766 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
767
768 if( ret ) {
769 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
770 ret, priv->dp_port_num );
771 }
772
773 return( ret );
774
775 }
776
777
778 /*
779 * Digi Set Modem Signals
780 *
781 * Sets or clears DTR and RTS on the port, according to the
782 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
783 * for the modem_signals argument. Returns 0 if successful,
784 * -EINTR if interrupted while sleeping, or a non-zero error
785 * returned by usb_submit_urb.
786 */
787
digi_set_modem_signals(struct usb_serial_port * port,unsigned int modem_signals,int interruptible)788 static int digi_set_modem_signals( struct usb_serial_port *port,
789 unsigned int modem_signals, int interruptible )
790 {
791
792 int ret;
793 struct digi_port *port_priv = (struct digi_port *)port->private;
794 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)port->serial->private)->ds_oob_port;
795 struct digi_port *oob_priv = (struct digi_port *)oob_port->private;
796 unsigned char *data = oob_port->write_urb->transfer_buffer;
797 unsigned long flags = 0;
798
799
800 dbg( "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
801 port_priv->dp_port_num, modem_signals );
802
803 spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
804 spin_lock( &port_priv->dp_port_lock );
805
806 while( oob_port->write_urb->status == -EINPROGRESS
807 || oob_priv->dp_write_urb_in_use ) {
808 spin_unlock( &port_priv->dp_port_lock );
809 cond_wait_interruptible_timeout_irqrestore(
810 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
811 &oob_priv->dp_port_lock, flags );
812 if( interruptible && signal_pending(current) ) {
813 return( -EINTR );
814 }
815 spin_lock_irqsave( &oob_priv->dp_port_lock, flags );
816 spin_lock( &port_priv->dp_port_lock );
817 }
818
819 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
820 data[1] = port_priv->dp_port_num;
821 data[2] = (modem_signals&TIOCM_DTR) ?
822 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
823 data[3] = 0;
824
825 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
826 data[5] = port_priv->dp_port_num;
827 data[6] = (modem_signals&TIOCM_RTS) ?
828 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
829 data[7] = 0;
830
831 oob_port->write_urb->transfer_buffer_length = 8;
832 oob_port->write_urb->dev = port->serial->dev;
833
834 if( (ret=usb_submit_urb(oob_port->write_urb)) == 0 ) {
835 oob_priv->dp_write_urb_in_use = 1;
836 port_priv->dp_modem_signals =
837 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
838 | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
839 }
840
841 spin_unlock( &port_priv->dp_port_lock );
842 spin_unlock_irqrestore( &oob_priv->dp_port_lock, flags );
843
844 if( ret ) {
845 err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__,
846 ret );
847 }
848
849 return( ret );
850
851 }
852
853
854 /*
855 * Digi Transmit Idle
856 *
857 * Digi transmit idle waits, up to timeout ticks, for the transmitter
858 * to go idle. It returns 0 if successful or a negative error.
859 *
860 * There are race conditions here if more than one process is calling
861 * digi_transmit_idle on the same port at the same time. However, this
862 * is only called from close, and only one process can be in close on a
863 * port at a time, so its ok.
864 */
865
digi_transmit_idle(struct usb_serial_port * port,unsigned long timeout)866 static int digi_transmit_idle( struct usb_serial_port *port,
867 unsigned long timeout )
868 {
869
870 int ret;
871 unsigned char buf[2];
872 struct digi_port *priv = (struct digi_port *)(port->private);
873 unsigned long flags = 0;
874
875
876 spin_lock_irqsave( &priv->dp_port_lock, flags );
877 priv->dp_transmit_idle = 0;
878 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
879
880 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
881 buf[1] = 0;
882
883 timeout += jiffies;
884
885 if( (ret=digi_write_inb_command( port, buf, 2, timeout-jiffies )) != 0 )
886 return( ret );
887
888 spin_lock_irqsave( &priv->dp_port_lock, flags );
889
890 while( time_before(jiffies, timeout) && !priv->dp_transmit_idle ) {
891 cond_wait_interruptible_timeout_irqrestore(
892 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
893 &priv->dp_port_lock, flags );
894 if( signal_pending(current) ) {
895 return( -EINTR );
896 }
897 spin_lock_irqsave( &priv->dp_port_lock, flags );
898 }
899
900 priv->dp_transmit_idle = 0;
901 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
902
903 return( 0 );
904
905 }
906
907
digi_rx_throttle(struct usb_serial_port * port)908 static void digi_rx_throttle( struct usb_serial_port *port )
909 {
910
911 unsigned long flags;
912 struct digi_port *priv = (struct digi_port *)(port->private);
913
914
915 dbg( "digi_rx_throttle: TOP: port=%d", priv->dp_port_num );
916
917 /* stop receiving characters by not resubmitting the read urb */
918 spin_lock_irqsave( &priv->dp_port_lock, flags );
919 priv->dp_throttled = 1;
920 priv->dp_throttle_restart = 0;
921 priv->dp_in_buf_len = 0;
922 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
923
924 }
925
926
digi_rx_unthrottle(struct usb_serial_port * port)927 static void digi_rx_unthrottle( struct usb_serial_port *port )
928 {
929
930 int ret = 0;
931 int len;
932 unsigned long flags;
933 struct digi_port *priv = (struct digi_port *)(port->private);
934 struct tty_struct *tty = port->tty;
935
936
937 dbg( "digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num );
938
939 spin_lock_irqsave( &priv->dp_port_lock, flags );
940
941 /* send any buffered chars from throttle time on to tty subsystem */
942 len = min(priv->dp_in_buf_len, TTY_FLIPBUF_SIZE - tty->flip.count );
943 if( len > 0 ) {
944 memcpy( tty->flip.char_buf_ptr, priv->dp_in_buf, len );
945 memcpy( tty->flip.flag_buf_ptr, priv->dp_in_flag_buf, len );
946 tty->flip.char_buf_ptr += len;
947 tty->flip.flag_buf_ptr += len;
948 tty->flip.count += len;
949 tty_flip_buffer_push( tty );
950 }
951
952 /* restart read chain */
953 if( priv->dp_throttle_restart ) {
954 port->read_urb->dev = port->serial->dev;
955 ret = usb_submit_urb( port->read_urb );
956 }
957
958 /* turn throttle off */
959 priv->dp_throttled = 0;
960 priv->dp_in_buf_len = 0;
961 priv->dp_throttle_restart = 0;
962
963 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
964
965 if( ret ) {
966 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
967 ret, priv->dp_port_num );
968 }
969
970 }
971
972
digi_set_termios(struct usb_serial_port * port,struct termios * old_termios)973 static void digi_set_termios( struct usb_serial_port *port,
974 struct termios *old_termios )
975 {
976
977 struct digi_port *priv = (struct digi_port *)(port->private);
978 unsigned int iflag = port->tty->termios->c_iflag;
979 unsigned int cflag = port->tty->termios->c_cflag;
980 unsigned int old_iflag = old_termios->c_iflag;
981 unsigned int old_cflag = old_termios->c_cflag;
982 unsigned char buf[32];
983 unsigned int modem_signals;
984 int arg,ret;
985 int i = 0;
986
987
988 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 );
989
990 /* set baud rate */
991 if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
992
993 arg = -1;
994
995 /* reassert DTR and (maybe) RTS on transition from B0 */
996 if( (old_cflag&CBAUD) == B0 ) {
997 /* don't set RTS if using hardware flow control */
998 /* and throttling input */
999 modem_signals = TIOCM_DTR;
1000 if( !(port->tty->termios->c_cflag & CRTSCTS) ||
1001 !test_bit(TTY_THROTTLED, &port->tty->flags) ) {
1002 modem_signals |= TIOCM_RTS;
1003 }
1004 digi_set_modem_signals( port, modem_signals, 1 );
1005 }
1006
1007 switch( (cflag&CBAUD) ) {
1008 /* drop DTR and RTS on transition to B0 */
1009 case B0: digi_set_modem_signals( port, 0, 1 ); break;
1010 case B50: arg = DIGI_BAUD_50; break;
1011 case B75: arg = DIGI_BAUD_75; break;
1012 case B110: arg = DIGI_BAUD_110; break;
1013 case B150: arg = DIGI_BAUD_150; break;
1014 case B200: arg = DIGI_BAUD_200; break;
1015 case B300: arg = DIGI_BAUD_300; break;
1016 case B600: arg = DIGI_BAUD_600; break;
1017 case B1200: arg = DIGI_BAUD_1200; break;
1018 case B1800: arg = DIGI_BAUD_1800; break;
1019 case B2400: arg = DIGI_BAUD_2400; break;
1020 case B4800: arg = DIGI_BAUD_4800; break;
1021 case B9600: arg = DIGI_BAUD_9600; break;
1022 case B19200: arg = DIGI_BAUD_19200; break;
1023 case B38400: arg = DIGI_BAUD_38400; break;
1024 case B57600: arg = DIGI_BAUD_57600; break;
1025 case B115200: arg = DIGI_BAUD_115200; break;
1026 case B230400: arg = DIGI_BAUD_230400; break;
1027 case B460800: arg = DIGI_BAUD_460800; break;
1028 default:
1029 dbg( "digi_set_termios: can't handle baud rate 0x%x",
1030 (cflag&CBAUD) );
1031 break;
1032 }
1033
1034 if( arg != -1 ) {
1035 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
1036 buf[i++] = priv->dp_port_num;
1037 buf[i++] = arg;
1038 buf[i++] = 0;
1039 }
1040
1041 }
1042
1043 /* set parity */
1044 if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {
1045
1046 if( (cflag&PARENB) ) {
1047 if( (cflag&PARODD) )
1048 arg = DIGI_PARITY_ODD;
1049 else
1050 arg = DIGI_PARITY_EVEN;
1051 } else {
1052 arg = DIGI_PARITY_NONE;
1053 }
1054
1055 buf[i++] = DIGI_CMD_SET_PARITY;
1056 buf[i++] = priv->dp_port_num;
1057 buf[i++] = arg;
1058 buf[i++] = 0;
1059
1060 }
1061
1062 /* set word size */
1063 if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {
1064
1065 arg = -1;
1066
1067 switch( (cflag&CSIZE) ) {
1068 case CS5: arg = DIGI_WORD_SIZE_5; break;
1069 case CS6: arg = DIGI_WORD_SIZE_6; break;
1070 case CS7: arg = DIGI_WORD_SIZE_7; break;
1071 case CS8: arg = DIGI_WORD_SIZE_8; break;
1072 default:
1073 dbg( "digi_set_termios: can't handle word size %d",
1074 (cflag&CSIZE) );
1075 break;
1076 }
1077
1078 if( arg != -1 ) {
1079 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
1080 buf[i++] = priv->dp_port_num;
1081 buf[i++] = arg;
1082 buf[i++] = 0;
1083 }
1084
1085 }
1086
1087 /* set stop bits */
1088 if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {
1089
1090 if( (cflag&CSTOPB) )
1091 arg = DIGI_STOP_BITS_2;
1092 else
1093 arg = DIGI_STOP_BITS_1;
1094
1095 buf[i++] = DIGI_CMD_SET_STOP_BITS;
1096 buf[i++] = priv->dp_port_num;
1097 buf[i++] = arg;
1098 buf[i++] = 0;
1099
1100 }
1101
1102 /* set input flow control */
1103 if( (iflag&IXOFF) != (old_iflag&IXOFF)
1104 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
1105
1106 arg = 0;
1107
1108 if( (iflag&IXOFF) )
1109 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1110 else
1111 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
1112
1113 if( (cflag&CRTSCTS) ) {
1114
1115 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
1116
1117 /* On USB-4 it is necessary to assert RTS prior */
1118 /* to selecting RTS input flow control. */
1119 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
1120 buf[i++] = priv->dp_port_num;
1121 buf[i++] = DIGI_RTS_ACTIVE;
1122 buf[i++] = 0;
1123
1124 } else {
1125 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
1126 }
1127
1128 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1129 buf[i++] = priv->dp_port_num;
1130 buf[i++] = arg;
1131 buf[i++] = 0;
1132
1133 }
1134
1135 /* set output flow control */
1136 if( (iflag&IXON) != (old_iflag&IXON)
1137 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
1138
1139 arg = 0;
1140
1141 if( (iflag&IXON) )
1142 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1143 else
1144 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
1145
1146 if( (cflag&CRTSCTS) ) {
1147 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
1148 } else {
1149 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
1150 port->tty->hw_stopped = 0;
1151 }
1152
1153 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1154 buf[i++] = priv->dp_port_num;
1155 buf[i++] = arg;
1156 buf[i++] = 0;
1157
1158 }
1159
1160 /* set receive enable/disable */
1161 if( (cflag&CREAD) != (old_cflag&CREAD) ) {
1162
1163 if( (cflag&CREAD) )
1164 arg = DIGI_ENABLE;
1165 else
1166 arg = DIGI_DISABLE;
1167
1168 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
1169 buf[i++] = priv->dp_port_num;
1170 buf[i++] = arg;
1171 buf[i++] = 0;
1172
1173 }
1174
1175 if( (ret=digi_write_oob_command( port, buf, i, 1 )) != 0 )
1176 dbg( "digi_set_termios: write oob failed, ret=%d", ret );
1177
1178 }
1179
1180
digi_break_ctl(struct usb_serial_port * port,int break_state)1181 static void digi_break_ctl( struct usb_serial_port *port, int break_state )
1182 {
1183
1184 unsigned char buf[4];
1185
1186
1187 buf[0] = DIGI_CMD_BREAK_CONTROL;
1188 buf[1] = 2; /* length */
1189 buf[2] = break_state ? 1 : 0;
1190 buf[3] = 0; /* pad */
1191
1192 digi_write_inb_command( port, buf, 4, 0 );
1193
1194 }
1195
1196
digi_ioctl(struct usb_serial_port * port,struct file * file,unsigned int cmd,unsigned long arg)1197 static int digi_ioctl( struct usb_serial_port *port, struct file *file,
1198 unsigned int cmd, unsigned long arg )
1199 {
1200
1201 struct digi_port *priv = (struct digi_port *)(port->private);
1202 unsigned int val;
1203 unsigned long flags = 0;
1204
1205
1206 dbg( "digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd );
1207
1208 switch (cmd) {
1209
1210 case TIOCMGET:
1211 spin_lock_irqsave( &priv->dp_port_lock, flags );
1212 val = priv->dp_modem_signals;
1213 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1214 if( copy_to_user((unsigned int *)arg, &val, sizeof(int)) )
1215 return( -EFAULT );
1216 return( 0 );
1217
1218 case TIOCMSET:
1219 case TIOCMBIS:
1220 case TIOCMBIC:
1221 if( copy_from_user(&val, (unsigned int *)arg, sizeof(int)) )
1222 return( -EFAULT );
1223 spin_lock_irqsave( &priv->dp_port_lock, flags );
1224 if( cmd == TIOCMBIS )
1225 val = priv->dp_modem_signals | val;
1226 else if( cmd == TIOCMBIC )
1227 val = priv->dp_modem_signals & ~val;
1228 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1229 return( digi_set_modem_signals( port, val, 1 ) );
1230
1231 case TIOCMIWAIT:
1232 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
1233 /* TODO */
1234 return( 0 );
1235
1236 case TIOCGICOUNT:
1237 /* return count of modemline transitions */
1238 /* TODO */
1239 return 0;
1240
1241 }
1242
1243 return( -ENOIOCTLCMD );
1244
1245 }
1246
1247
digi_write(struct usb_serial_port * port,int from_user,const unsigned char * buf,int count)1248 static int digi_write( struct usb_serial_port *port, int from_user,
1249 const unsigned char *buf, int count )
1250 {
1251
1252 int ret,data_len,new_len;
1253 struct digi_port *priv = (struct digi_port *)(port->private);
1254 unsigned char *data = port->write_urb->transfer_buffer;
1255 unsigned char user_buf[64]; /* 64 bytes is max USB bulk packet */
1256 unsigned long flags = 0;
1257
1258
1259 dbg( "digi_write: TOP: port=%d, count=%d, from_user=%d, in_interrupt=%d",
1260 priv->dp_port_num, count, from_user, in_interrupt() );
1261
1262 /* copy user data (which can sleep) before getting spin lock */
1263 count = min( count, port->bulk_out_size-2 );
1264 count = min( 64, count);
1265 if( from_user && copy_from_user( user_buf, buf, count ) ) {
1266 return( -EFAULT );
1267 }
1268
1269 /* be sure only one write proceeds at a time */
1270 /* there are races on the port private buffer */
1271 /* and races to check write_urb->status */
1272 spin_lock_irqsave( &priv->dp_port_lock, flags );
1273
1274 /* wait for urb status clear to submit another urb */
1275 if( port->write_urb->status == -EINPROGRESS
1276 || priv->dp_write_urb_in_use ) {
1277
1278 /* buffer data if count is 1 (probably put_char) if possible */
1279 if( count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE ) {
1280 priv->dp_out_buf[priv->dp_out_buf_len++]
1281 = *(from_user ? user_buf : buf);
1282 new_len = 1;
1283 } else {
1284 new_len = 0;
1285 }
1286
1287 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1288
1289 return( new_len );
1290
1291 }
1292
1293 /* allow space for any buffered data and for new data, up to */
1294 /* transfer buffer size - 2 (for command and length bytes) */
1295 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
1296 data_len = new_len + priv->dp_out_buf_len;
1297
1298 if( data_len == 0 ) {
1299 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1300 return( 0 );
1301 }
1302
1303 port->write_urb->transfer_buffer_length = data_len+2;
1304 port->write_urb->dev = port->serial->dev;
1305
1306 *data++ = DIGI_CMD_SEND_DATA;
1307 *data++ = data_len;
1308
1309 /* copy in buffered data first */
1310 memcpy( data, priv->dp_out_buf, priv->dp_out_buf_len );
1311 data += priv->dp_out_buf_len;
1312
1313 /* copy in new data */
1314 memcpy( data, from_user ? user_buf : buf, new_len );
1315
1316 if( (ret=usb_submit_urb(port->write_urb)) == 0 ) {
1317 priv->dp_write_urb_in_use = 1;
1318 ret = new_len;
1319 priv->dp_out_buf_len = 0;
1320 }
1321
1322 /* return length of new data written, or error */
1323 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1324 if( ret < 0 ) {
1325 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
1326 ret, priv->dp_port_num );
1327 }
1328
1329 dbg( "digi_write: returning %d", ret );
1330 return( ret );
1331
1332 }
1333
1334
digi_write_bulk_callback(struct urb * urb)1335 static void digi_write_bulk_callback( struct urb *urb )
1336 {
1337
1338 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1339 struct usb_serial *serial;
1340 struct digi_port *priv;
1341 int ret = 0;
1342
1343
1344 dbg( "digi_write_bulk_callback: TOP, urb->status=%d", urb->status );
1345
1346 /* port and serial sanity check */
1347 if( port == NULL || (priv=(struct digi_port *)(port->private)) == NULL ) {
1348 err("%s: port or port->private is NULL, status=%d", __FUNCTION__,
1349 urb->status );
1350 return;
1351 }
1352 serial = port->serial;
1353 if( serial == NULL || serial->private == NULL ) {
1354 err("%s: serial or serial->private is NULL, status=%d", __FUNCTION__, urb->status );
1355 return;
1356 }
1357
1358 /* handle oob callback */
1359 if( priv->dp_port_num
1360 == ((struct digi_serial *)(serial->private))->ds_oob_port_num ) {
1361 dbg( "digi_write_bulk_callback: oob callback" );
1362 spin_lock( &priv->dp_port_lock );
1363 priv->dp_write_urb_in_use = 0;
1364 wake_up_interruptible( &port->write_wait );
1365 spin_unlock( &priv->dp_port_lock );
1366 return;
1367 }
1368
1369 /* further sanity checks */
1370 if( port_paranoia_check( port, __FUNCTION__ )
1371 || serial_paranoia_check( serial, __FUNCTION__ ) )
1372 return;
1373
1374 /* try to send any buffered data on this port, if it is open */
1375 spin_lock( &priv->dp_port_lock );
1376 priv->dp_write_urb_in_use = 0;
1377 if( port->open_count && port->write_urb->status != -EINPROGRESS
1378 && priv->dp_out_buf_len > 0 ) {
1379
1380 *((unsigned char *)(port->write_urb->transfer_buffer))
1381 = (unsigned char)DIGI_CMD_SEND_DATA;
1382 *((unsigned char *)(port->write_urb->transfer_buffer)+1)
1383 = (unsigned char)priv->dp_out_buf_len;
1384
1385 port->write_urb->transfer_buffer_length
1386 = priv->dp_out_buf_len+2;
1387 port->write_urb->dev = serial->dev;
1388
1389 memcpy( port->write_urb->transfer_buffer+2, priv->dp_out_buf,
1390 priv->dp_out_buf_len );
1391
1392 if( (ret=usb_submit_urb(port->write_urb)) == 0 ) {
1393 priv->dp_write_urb_in_use = 1;
1394 priv->dp_out_buf_len = 0;
1395 }
1396
1397 }
1398
1399 /* wake up processes sleeping on writes immediately */
1400 digi_wakeup_write( port );
1401
1402 /* also queue up a wakeup at scheduler time, in case we */
1403 /* lost the race in write_chan(). */
1404 schedule_task(&priv->dp_wakeup_task);
1405
1406 spin_unlock( &priv->dp_port_lock );
1407
1408 if( ret ) {
1409 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
1410 ret, priv->dp_port_num );
1411 }
1412
1413 }
1414
1415
digi_write_room(struct usb_serial_port * port)1416 static int digi_write_room( struct usb_serial_port *port )
1417 {
1418
1419 int room;
1420 struct digi_port *priv = (struct digi_port *)(port->private);
1421 unsigned long flags = 0;
1422
1423
1424 spin_lock_irqsave( &priv->dp_port_lock, flags );
1425
1426 if( port->write_urb->status == -EINPROGRESS
1427 || priv->dp_write_urb_in_use )
1428 room = 0;
1429 else
1430 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1431
1432 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1433
1434 dbg( "digi_write_room: port=%d, room=%d", priv->dp_port_num, room );
1435 return( room );
1436
1437 }
1438
1439
digi_chars_in_buffer(struct usb_serial_port * port)1440 static int digi_chars_in_buffer( struct usb_serial_port *port )
1441 {
1442
1443 struct digi_port *priv = (struct digi_port *)(port->private);
1444
1445
1446 if( port->write_urb->status == -EINPROGRESS
1447 || priv->dp_write_urb_in_use ) {
1448 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, port->bulk_out_size - 2 );
1449 /* return( port->bulk_out_size - 2 ); */
1450 return( 256 );
1451 } else {
1452 dbg( "digi_chars_in_buffer: port=%d, chars=%d", priv->dp_port_num, priv->dp_out_buf_len );
1453 return( priv->dp_out_buf_len );
1454 }
1455
1456 }
1457
1458
digi_open(struct usb_serial_port * port,struct file * filp)1459 static int digi_open( struct usb_serial_port *port, struct file *filp )
1460 {
1461
1462 int ret;
1463 unsigned char buf[32];
1464 struct digi_port *priv = (struct digi_port *)(port->private);
1465 struct termios not_termios;
1466 unsigned long flags = 0;
1467
1468
1469 dbg( "digi_open: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count );
1470
1471 /* be sure the device is started up */
1472 if( digi_startup_device( port->serial ) != 0 )
1473 return( -ENXIO );
1474
1475 spin_lock_irqsave( &priv->dp_port_lock, flags );
1476
1477 /* don't wait on a close in progress for non-blocking opens */
1478 if( priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
1479 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1480 return( -EAGAIN );
1481 }
1482
1483 /* wait for a close in progress to finish */
1484 while( priv->dp_in_close ) {
1485 cond_wait_interruptible_timeout_irqrestore(
1486 &priv->dp_close_wait, DIGI_RETRY_TIMEOUT,
1487 &priv->dp_port_lock, flags );
1488 if( signal_pending(current) ) {
1489 return( -EINTR );
1490 }
1491 spin_lock_irqsave( &priv->dp_port_lock, flags );
1492 }
1493
1494 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1495
1496 /* read modem signals automatically whenever they change */
1497 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1498 buf[1] = priv->dp_port_num;
1499 buf[2] = DIGI_ENABLE;
1500 buf[3] = 0;
1501
1502 /* flush fifos */
1503 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1504 buf[5] = priv->dp_port_num;
1505 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1506 buf[7] = 0;
1507
1508 if( (ret=digi_write_oob_command( port, buf, 8, 1 )) != 0 )
1509 dbg( "digi_open: write oob failed, ret=%d", ret );
1510
1511 /* set termios settings */
1512 not_termios.c_cflag = ~port->tty->termios->c_cflag;
1513 not_termios.c_iflag = ~port->tty->termios->c_iflag;
1514 digi_set_termios( port, ¬_termios );
1515
1516 /* set DTR and RTS */
1517 digi_set_modem_signals( port, TIOCM_DTR|TIOCM_RTS, 1 );
1518
1519 return( 0 );
1520
1521 }
1522
1523
digi_close(struct usb_serial_port * port,struct file * filp)1524 static void digi_close( struct usb_serial_port *port, struct file *filp )
1525 {
1526
1527 int ret;
1528 unsigned char buf[32];
1529 struct tty_struct *tty = port->tty;
1530 struct digi_port *priv = (struct digi_port *)port->private;
1531 unsigned long flags = 0;
1532
1533
1534 dbg( "digi_close: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count );
1535
1536
1537 /* do cleanup only after final close on this port */
1538 spin_lock_irqsave( &priv->dp_port_lock, flags );
1539 priv->dp_in_close = 1;
1540 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1541
1542 /* tell line discipline to process only XON/XOFF */
1543 tty->closing = 1;
1544
1545 /* wait for output to drain */
1546 if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
1547 tty_wait_until_sent( tty, DIGI_CLOSE_TIMEOUT );
1548 }
1549
1550 /* flush driver and line discipline buffers */
1551 if( tty->driver.flush_buffer )
1552 tty->driver.flush_buffer( tty );
1553 tty_ldisc_flush(tty);
1554
1555 if (port->serial->dev) {
1556 /* wait for transmit idle */
1557 if( (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0 ) {
1558 digi_transmit_idle( port, DIGI_CLOSE_TIMEOUT );
1559 }
1560
1561 /* drop DTR and RTS */
1562 digi_set_modem_signals( port, 0, 0 );
1563
1564 /* disable input flow control */
1565 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1566 buf[1] = priv->dp_port_num;
1567 buf[2] = DIGI_DISABLE;
1568 buf[3] = 0;
1569
1570 /* disable output flow control */
1571 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1572 buf[5] = priv->dp_port_num;
1573 buf[6] = DIGI_DISABLE;
1574 buf[7] = 0;
1575
1576 /* disable reading modem signals automatically */
1577 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1578 buf[9] = priv->dp_port_num;
1579 buf[10] = DIGI_DISABLE;
1580 buf[11] = 0;
1581
1582 /* disable receive */
1583 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1584 buf[13] = priv->dp_port_num;
1585 buf[14] = DIGI_DISABLE;
1586 buf[15] = 0;
1587
1588 /* flush fifos */
1589 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1590 buf[17] = priv->dp_port_num;
1591 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1592 buf[19] = 0;
1593
1594 if( (ret=digi_write_oob_command( port, buf, 20, 0 )) != 0 )
1595 dbg( "digi_close: write oob failed, ret=%d", ret );
1596
1597 /* wait for final commands on oob port to complete */
1598 interruptible_sleep_on_timeout( &priv->dp_flush_wait,
1599 DIGI_CLOSE_TIMEOUT );
1600
1601 /* shutdown any outstanding bulk writes */
1602 usb_unlink_urb (port->write_urb);
1603 }
1604
1605 tty->closing = 0;
1606
1607 spin_lock_irqsave( &priv->dp_port_lock, flags );
1608 priv->dp_write_urb_in_use = 0;
1609 priv->dp_in_close = 0;
1610 wake_up_interruptible( &priv->dp_close_wait );
1611 spin_unlock_irqrestore( &priv->dp_port_lock, flags );
1612
1613 dbg( "digi_close: done" );
1614 }
1615
1616
1617 /*
1618 * Digi Startup Device
1619 *
1620 * Starts reads on all ports. Must be called AFTER startup, with
1621 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1622 */
1623
digi_startup_device(struct usb_serial * serial)1624 static int digi_startup_device( struct usb_serial *serial )
1625 {
1626
1627 int i,ret = 0;
1628 struct digi_serial *serial_priv = (struct digi_serial *)serial->private;
1629 struct usb_serial_port *port;
1630
1631
1632 /* be sure this happens exactly once */
1633 spin_lock( &serial_priv->ds_serial_lock );
1634 if( serial_priv->ds_device_started ) {
1635 spin_unlock( &serial_priv->ds_serial_lock );
1636 return( 0 );
1637 }
1638 serial_priv->ds_device_started = 1;
1639 spin_unlock( &serial_priv->ds_serial_lock );
1640
1641 /* start reading from each bulk in endpoint for the device */
1642 /* set USB_DISABLE_SPD flag for write bulk urbs */
1643 for( i=0; i<serial->type->num_ports+1; i++ ) {
1644
1645 port = &serial->port[i];
1646
1647 port->write_urb->dev = port->serial->dev;
1648
1649 if( (ret=usb_submit_urb(port->read_urb)) != 0 ) {
1650 err("%s: usb_submit_urb failed, ret=%d, port=%d", __FUNCTION__,
1651 ret, i );
1652 break;
1653 }
1654
1655 }
1656
1657 return( ret );
1658
1659 }
1660
1661
digi_startup(struct usb_serial * serial)1662 static int digi_startup( struct usb_serial *serial )
1663 {
1664
1665 int i;
1666 struct digi_port *priv;
1667 struct digi_serial *serial_priv;
1668
1669
1670 dbg( "digi_startup: TOP" );
1671
1672 /* allocate the private data structures for all ports */
1673 /* number of regular ports + 1 for the out-of-band port */
1674 for( i=0; i<serial->type->num_ports+1; i++ ) {
1675
1676 /* allocate port private structure */
1677 priv = serial->port[i].private =
1678 (struct digi_port *)kmalloc( sizeof(struct digi_port),
1679 GFP_KERNEL );
1680 if( priv == (struct digi_port *)0 ) {
1681 while( --i >= 0 )
1682 kfree( serial->port[i].private );
1683 return( 1 ); /* error */
1684 }
1685
1686 /* initialize port private structure */
1687 spin_lock_init( &priv->dp_port_lock );
1688 priv->dp_port_num = i;
1689 priv->dp_out_buf_len = 0;
1690 priv->dp_in_buf_len = 0;
1691 priv->dp_write_urb_in_use = 0;
1692 priv->dp_modem_signals = 0;
1693 init_waitqueue_head( &priv->dp_modem_change_wait );
1694 priv->dp_transmit_idle = 0;
1695 init_waitqueue_head( &priv->dp_transmit_idle_wait );
1696 priv->dp_throttled = 0;
1697 priv->dp_throttle_restart = 0;
1698 init_waitqueue_head( &priv->dp_flush_wait );
1699 priv->dp_in_close = 0;
1700 init_waitqueue_head( &priv->dp_close_wait );
1701 INIT_LIST_HEAD(&priv->dp_wakeup_task.list);
1702 priv->dp_wakeup_task.sync = 0;
1703 priv->dp_wakeup_task.routine = (void *)digi_wakeup_write_lock;
1704 priv->dp_wakeup_task.data = (void *)(&serial->port[i]);
1705
1706 /* initialize write wait queue for this port */
1707 init_waitqueue_head( &serial->port[i].write_wait );
1708
1709 }
1710
1711 /* allocate serial private structure */
1712 serial_priv = serial->private =
1713 (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( serial->port[i].private );
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
1727 return( 0 );
1728
1729 }
1730
1731
digi_shutdown(struct usb_serial * serial)1732 static void digi_shutdown( struct usb_serial *serial )
1733 {
1734
1735 int i;
1736
1737
1738 dbg( "digi_shutdown: TOP, in_interrupt()=%d", in_interrupt() );
1739
1740 /* stop reads and writes on all ports */
1741 for( i=0; i<serial->type->num_ports+1; i++ ) {
1742 usb_unlink_urb( serial->port[i].read_urb );
1743 usb_unlink_urb( serial->port[i].write_urb );
1744 }
1745
1746 /* free the private data structures for all ports */
1747 /* number of regular ports + 1 for the out-of-band port */
1748 for( i=0; i<serial->type->num_ports+1; i++ )
1749 kfree( serial->port[i].private );
1750 kfree( serial->private );
1751
1752 }
1753
1754
digi_read_bulk_callback(struct urb * urb)1755 static void digi_read_bulk_callback( struct urb *urb )
1756 {
1757
1758 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1759 struct digi_port *priv;
1760 int ret;
1761
1762
1763 dbg( "digi_read_bulk_callback: TOP" );
1764
1765 /* port sanity check, do not resubmit if port is not valid */
1766 if( port == NULL || (priv=(struct digi_port *)(port->private)) == NULL ) {
1767 err("%s: port or port->private is NULL, status=%d", __FUNCTION__,
1768 urb->status );
1769 return;
1770 }
1771 if( port->serial == NULL
1772 || serial_paranoia_check( port->serial, __FUNCTION__ )
1773 || port->serial->private == 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
1786 == ((struct digi_serial *)(port->serial->private))->ds_oob_port_num ) {
1787 if( digi_read_oob_callback( urb ) != 0 )
1788 return;
1789 } else {
1790 if( digi_read_inb_callback( urb ) != 0 )
1791 return;
1792 }
1793
1794 /* continue read */
1795 urb->dev = port->serial->dev;
1796 if( (ret=usb_submit_urb(urb)) != 0 ) {
1797 err("%s: failed resubmitting urb, ret=%d, port=%d", __FUNCTION__,
1798 ret, priv->dp_port_num );
1799 }
1800
1801 }
1802
1803
1804 /*
1805 * Digi Read INB Callback
1806 *
1807 * Digi Read INB Callback handles reads on the in band ports, sending
1808 * the data on to the tty subsystem. When called we know port and
1809 * port->private are not NULL and port->serial has been validated.
1810 * It returns 0 if successful, 1 if successful but the port is
1811 * throttled, and -1 if the sanity checks failed.
1812 */
1813
digi_read_inb_callback(struct urb * urb)1814 static int digi_read_inb_callback( struct urb *urb )
1815 {
1816
1817 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1818 struct tty_struct *tty = port->tty;
1819 struct digi_port *priv = (struct digi_port *)(port->private);
1820 int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1821 int len = ((unsigned char *)urb->transfer_buffer)[1];
1822 int status = ((unsigned char *)urb->transfer_buffer)[2];
1823 unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3;
1824 int flag,throttled;
1825
1826
1827 /* sanity check */
1828 if( port_paranoia_check( port, __FUNCTION__ ) )
1829 return( -1 );
1830
1831 /* do not process callbacks on closed ports */
1832 /* but do continue the read chain */
1833 if( port->open_count == 0 )
1834 return( 0 );
1835
1836 /* short/multiple packet check */
1837 if( urb->actual_length != len + 2 ) {
1838 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 );
1839 return( -1 );
1840 }
1841
1842 spin_lock( &priv->dp_port_lock );
1843
1844 /* check for throttle; if set, do not resubmit read urb */
1845 /* indicate the read chain needs to be restarted on unthrottle */
1846 throttled = priv->dp_throttled;
1847 if( throttled )
1848 priv->dp_throttle_restart = 1;
1849
1850 /* receive data */
1851 if( opcode == DIGI_CMD_RECEIVE_DATA ) {
1852
1853 /* get flag from status */
1854 flag = 0;
1855
1856 /* overrun is special, not associated with a char */
1857 if( status & DIGI_OVERRUN_ERROR ) {
1858 tty_insert_flip_char( tty, 0, TTY_OVERRUN );
1859 }
1860
1861 /* break takes precedence over parity, */
1862 /* which takes precedence over framing errors */
1863 if( status & DIGI_BREAK_ERROR ) {
1864 flag = TTY_BREAK;
1865 } else if( status & DIGI_PARITY_ERROR ) {
1866 flag = TTY_PARITY;
1867 } else if( status & DIGI_FRAMING_ERROR ) {
1868 flag = TTY_FRAME;
1869 }
1870
1871 /* data length is len-1 (one byte of len is status) */
1872 --len;
1873
1874 if( throttled ) {
1875
1876 len = min( len,
1877 DIGI_IN_BUF_SIZE - priv->dp_in_buf_len );
1878
1879 if( len > 0 ) {
1880 memcpy( priv->dp_in_buf + priv->dp_in_buf_len,
1881 data, len );
1882 memset( priv->dp_in_flag_buf
1883 + priv->dp_in_buf_len, flag, len );
1884 priv->dp_in_buf_len += len;
1885 }
1886
1887 } else {
1888
1889 len = min( len, TTY_FLIPBUF_SIZE - tty->flip.count );
1890
1891 if( len > 0 ) {
1892 memcpy( tty->flip.char_buf_ptr, data, len );
1893 memset( tty->flip.flag_buf_ptr, flag, len );
1894 tty->flip.char_buf_ptr += len;
1895 tty->flip.flag_buf_ptr += len;
1896 tty->flip.count += len;
1897 tty_flip_buffer_push( tty );
1898 }
1899
1900 }
1901
1902 }
1903
1904 spin_unlock( &priv->dp_port_lock );
1905
1906 if( opcode == DIGI_CMD_RECEIVE_DISABLE ) {
1907 dbg("%s: got RECEIVE_DISABLE", __FUNCTION__ );
1908 } else if( opcode != DIGI_CMD_RECEIVE_DATA ) {
1909 dbg("%s: unknown opcode: %d", __FUNCTION__, opcode );
1910 }
1911
1912 return( throttled ? 1 : 0 );
1913
1914 }
1915
1916
1917 /*
1918 * Digi Read OOB Callback
1919 *
1920 * Digi Read OOB Callback handles reads on the out of band port.
1921 * When called we know port and port->private are not NULL and
1922 * the port->serial is valid. It returns 0 if successful, and
1923 * -1 if the sanity checks failed.
1924 */
1925
digi_read_oob_callback(struct urb * urb)1926 static int digi_read_oob_callback( struct urb *urb )
1927 {
1928
1929 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1930 struct usb_serial *serial = port->serial;
1931 struct digi_port *priv = (struct digi_port *)(port->private);
1932 int opcode, line, status, val;
1933 int i;
1934
1935
1936 dbg( "digi_read_oob_callback: port=%d, len=%d", priv->dp_port_num,
1937 urb->actual_length );
1938
1939 /* handle each oob command */
1940 for( i=0; i<urb->actual_length-3; ) {
1941
1942 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1943 line = ((unsigned char *)urb->transfer_buffer)[i++];
1944 status = ((unsigned char *)urb->transfer_buffer)[i++];
1945 val = ((unsigned char *)urb->transfer_buffer)[i++];
1946
1947 dbg( "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
1948 opcode, line, status, val );
1949
1950 if( status != 0 || line >= serial->type->num_ports )
1951 continue;
1952
1953 port = &serial->port[line];
1954
1955 if( port_paranoia_check( port, __FUNCTION__ )
1956 || (priv=port->private) == NULL )
1957 return( -1 );
1958
1959 if( opcode == DIGI_CMD_READ_INPUT_SIGNALS ) {
1960
1961 spin_lock( &priv->dp_port_lock );
1962
1963 /* convert from digi flags to termiox flags */
1964 if( val & DIGI_READ_INPUT_SIGNALS_CTS ) {
1965 priv->dp_modem_signals |= TIOCM_CTS;
1966 /* port must be open to use tty struct */
1967 if( port->open_count
1968 && port->tty->termios->c_cflag & CRTSCTS ) {
1969 port->tty->hw_stopped = 0;
1970 digi_wakeup_write( port );
1971 }
1972 } else {
1973 priv->dp_modem_signals &= ~TIOCM_CTS;
1974 /* port must be open to use tty struct */
1975 if( port->open_count
1976 && port->tty->termios->c_cflag & CRTSCTS ) {
1977 port->tty->hw_stopped = 1;
1978 }
1979 }
1980 if( val & DIGI_READ_INPUT_SIGNALS_DSR )
1981 priv->dp_modem_signals |= TIOCM_DSR;
1982 else
1983 priv->dp_modem_signals &= ~TIOCM_DSR;
1984 if( val & DIGI_READ_INPUT_SIGNALS_RI )
1985 priv->dp_modem_signals |= TIOCM_RI;
1986 else
1987 priv->dp_modem_signals &= ~TIOCM_RI;
1988 if( val & DIGI_READ_INPUT_SIGNALS_DCD )
1989 priv->dp_modem_signals |= TIOCM_CD;
1990 else
1991 priv->dp_modem_signals &= ~TIOCM_CD;
1992
1993 wake_up_interruptible( &priv->dp_modem_change_wait );
1994 spin_unlock( &priv->dp_port_lock );
1995
1996 } else if( opcode == DIGI_CMD_TRANSMIT_IDLE ) {
1997
1998 spin_lock( &priv->dp_port_lock );
1999 priv->dp_transmit_idle = 1;
2000 wake_up_interruptible( &priv->dp_transmit_idle_wait );
2001 spin_unlock( &priv->dp_port_lock );
2002
2003 } else if( opcode == DIGI_CMD_IFLUSH_FIFO ) {
2004
2005 wake_up_interruptible( &priv->dp_flush_wait );
2006
2007 }
2008
2009 }
2010
2011 return( 0 );
2012
2013 }
2014
2015
digi_init(void)2016 static int __init digi_init (void)
2017 {
2018 usb_serial_register (&digi_acceleport_2_device);
2019 usb_serial_register (&digi_acceleport_4_device);
2020 info(DRIVER_VERSION ":" DRIVER_DESC);
2021 return 0;
2022 }
2023
2024
digi_exit(void)2025 static void __exit digi_exit (void)
2026 {
2027 usb_serial_deregister (&digi_acceleport_2_device);
2028 usb_serial_deregister (&digi_acceleport_4_device);
2029 }
2030
2031
2032 module_init(digi_init);
2033 module_exit(digi_exit);
2034
2035
2036 MODULE_AUTHOR( DRIVER_AUTHOR );
2037 MODULE_DESCRIPTION( DRIVER_DESC );
2038 MODULE_LICENSE("GPL");
2039
2040 MODULE_PARM(debug, "i");
2041 MODULE_PARM_DESC(debug, "Debug enabled or not");
2042
2043