projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge 3.9-rc7 intp tty-next
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / serial / digi_acceleport.c
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
18 #include <linux/kernel.h>
19 #include <linux/errno.h>
20 #include <linux/init.h>
21 #include <linux/slab.h>
22 #include <linux/tty.h>
23 #include <linux/tty_driver.h>
24 #include <linux/tty_flip.h>
25 #include <linux/module.h>
26 #include <linux/spinlock.h>
27 #include <linux/workqueue.h>
28 #include <linux/uaccess.h>
29 #include <linux/usb.h>
30 #include <linux/wait.h>
31 #include <linux/usb/serial.h>
32
33 /* Defines */
34
35 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
36 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
37
38 /* port output buffer length -- must be <= transfer buffer length - 2 */
39 /* so we can be sure to send the full buffer in one urb */
40 #define DIGI_OUT_BUF_SIZE 8
41
42 /* port input buffer length -- must be >= transfer buffer length - 3 */
43 /* so we can be sure to hold at least one full buffer from one urb */
44 #define DIGI_IN_BUF_SIZE 64
45
46 /* retry timeout while sleeping */
47 #define DIGI_RETRY_TIMEOUT (HZ/10)
48
49 /* timeout while waiting for tty output to drain in close */
50 /* this delay is used twice in close, so the total delay could */
51 /* be twice this value */
52 #define DIGI_CLOSE_TIMEOUT (5*HZ)
53
54
55 /* AccelePort USB Defines */
56
57 /* ids */
58 #define DIGI_VENDOR_ID 0x05c5
59 #define DIGI_2_ID 0x0002 /* USB-2 */
60 #define DIGI_4_ID 0x0004 /* USB-4 */
61
62 /* commands
63 * "INB": can be used on the in-band endpoint
64 * "OOB": can be used on the out-of-band endpoint
65 */
66 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
67 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
68 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
69 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
70 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
71 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
72 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
73 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
74 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
75 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
76 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
77 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
78 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
79 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
80 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
81 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
82 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
83 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
84 #define DIGI_CMD_SEND_DATA 18 /* INB */
85 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */
86 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
87 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
88
89 /* baud rates */
90 #define DIGI_BAUD_50 0
91 #define DIGI_BAUD_75 1
92 #define DIGI_BAUD_110 2
93 #define DIGI_BAUD_150 3
94 #define DIGI_BAUD_200 4
95 #define DIGI_BAUD_300 5
96 #define DIGI_BAUD_600 6
97 #define DIGI_BAUD_1200 7
98 #define DIGI_BAUD_1800 8
99 #define DIGI_BAUD_2400 9
100 #define DIGI_BAUD_4800 10
101 #define DIGI_BAUD_7200 11
102 #define DIGI_BAUD_9600 12
103 #define DIGI_BAUD_14400 13
104 #define DIGI_BAUD_19200 14
105 #define DIGI_BAUD_28800 15
106 #define DIGI_BAUD_38400 16
107 #define DIGI_BAUD_57600 17
108 #define DIGI_BAUD_76800 18
109 #define DIGI_BAUD_115200 19
110 #define DIGI_BAUD_153600 20
111 #define DIGI_BAUD_230400 21
112 #define DIGI_BAUD_460800 22
113
114 /* arguments */
115 #define DIGI_WORD_SIZE_5 0
116 #define DIGI_WORD_SIZE_6 1
117 #define DIGI_WORD_SIZE_7 2
118 #define DIGI_WORD_SIZE_8 3
119
120 #define DIGI_PARITY_NONE 0
121 #define DIGI_PARITY_ODD 1
122 #define DIGI_PARITY_EVEN 2
123 #define DIGI_PARITY_MARK 3
124 #define DIGI_PARITY_SPACE 4
125
126 #define DIGI_STOP_BITS_1 0
127 #define DIGI_STOP_BITS_2 1
128
129 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
130 #define DIGI_INPUT_FLOW_CONTROL_RTS 2
131 #define DIGI_INPUT_FLOW_CONTROL_DTR 4
132
133 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
134 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
135 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
136
137 #define DIGI_DTR_INACTIVE 0
138 #define DIGI_DTR_ACTIVE 1
139 #define DIGI_DTR_INPUT_FLOW_CONTROL 2
140
141 #define DIGI_RTS_INACTIVE 0
142 #define DIGI_RTS_ACTIVE 1
143 #define DIGI_RTS_INPUT_FLOW_CONTROL 2
144 #define DIGI_RTS_TOGGLE 3
145
146 #define DIGI_FLUSH_TX 1
147 #define DIGI_FLUSH_RX 2
148 #define DIGI_RESUME_TX 4 /* clears xoff condition */
149
150 #define DIGI_TRANSMIT_NOT_IDLE 0
151 #define DIGI_TRANSMIT_IDLE 1
152
153 #define DIGI_DISABLE 0
154 #define DIGI_ENABLE 1
155
156 #define DIGI_DEASSERT 0
157 #define DIGI_ASSERT 1
158
159 /* in band status codes */
160 #define DIGI_OVERRUN_ERROR 4
161 #define DIGI_PARITY_ERROR 8
162 #define DIGI_FRAMING_ERROR 16
163 #define DIGI_BREAK_ERROR 32
164
165 /* out of band status */
166 #define DIGI_NO_ERROR 0
167 #define DIGI_BAD_FIRST_PARAMETER 1
168 #define DIGI_BAD_SECOND_PARAMETER 2
169 #define DIGI_INVALID_LINE 3
170 #define DIGI_INVALID_OPCODE 4
171
172 /* input signals */
173 #define DIGI_READ_INPUT_SIGNALS_SLOT 1
174 #define DIGI_READ_INPUT_SIGNALS_ERR 2
175 #define DIGI_READ_INPUT_SIGNALS_BUSY 4
176 #define DIGI_READ_INPUT_SIGNALS_PE 8
177 #define DIGI_READ_INPUT_SIGNALS_CTS 16
178 #define DIGI_READ_INPUT_SIGNALS_DSR 32
179 #define DIGI_READ_INPUT_SIGNALS_RI 64
180 #define DIGI_READ_INPUT_SIGNALS_DCD 128
181
182
183 /* Structures */
184
185 struct digi_serial {
186 spinlock_t ds_serial_lock;
187 struct usb_serial_port *ds_oob_port; /* out-of-band port */
188 int ds_oob_port_num; /* index of out-of-band port */
189 int ds_device_started;
190 };
191
192 struct digi_port {
193 spinlock_t dp_port_lock;
194 int dp_port_num;
195 int dp_out_buf_len;
196 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
197 int dp_write_urb_in_use;
198 unsigned int dp_modem_signals;
199 wait_queue_head_t dp_modem_change_wait;
200 int dp_transmit_idle;
201 wait_queue_head_t dp_transmit_idle_wait;
202 int dp_throttled;
203 int dp_throttle_restart;
204 wait_queue_head_t dp_flush_wait;
205 wait_queue_head_t dp_close_wait; /* wait queue for close */
206 struct work_struct dp_wakeup_work;
207 struct usb_serial_port *dp_port;
208 };
209
210
211 /* Local Function Declarations */
212
213 static void digi_wakeup_write_lock(struct work_struct *work);
214 static int digi_write_oob_command(struct usb_serial_port *port,
215 unsigned char *buf, int count, int interruptible);
216 static int digi_write_inb_command(struct usb_serial_port *port,
217 unsigned char *buf, int count, unsigned long timeout);
218 static int digi_set_modem_signals(struct usb_serial_port *port,
219 unsigned int modem_signals, int interruptible);
220 static int digi_transmit_idle(struct usb_serial_port *port,
221 unsigned long timeout);
222 static void digi_rx_throttle(struct tty_struct *tty);
223 static void digi_rx_unthrottle(struct tty_struct *tty);
224 static void digi_set_termios(struct tty_struct *tty,
225 struct usb_serial_port *port, struct ktermios *old_termios);
226 static void digi_break_ctl(struct tty_struct *tty, int break_state);
227 static int digi_tiocmget(struct tty_struct *tty);
228 static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
229 unsigned int clear);
230 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
231 const unsigned char *buf, int count);
232 static void digi_write_bulk_callback(struct urb *urb);
233 static int digi_write_room(struct tty_struct *tty);
234 static int digi_chars_in_buffer(struct tty_struct *tty);
235 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
236 static void digi_close(struct usb_serial_port *port);
237 static void digi_dtr_rts(struct usb_serial_port *port, int on);
238 static int digi_startup_device(struct usb_serial *serial);
239 static int digi_startup(struct usb_serial *serial);
240 static void digi_disconnect(struct usb_serial *serial);
241 static void digi_release(struct usb_serial *serial);
242 static int digi_port_probe(struct usb_serial_port *port);
243 static int digi_port_remove(struct usb_serial_port *port);
244 static void digi_read_bulk_callback(struct urb *urb);
245 static int digi_read_inb_callback(struct urb *urb);
246 static int digi_read_oob_callback(struct urb *urb);
247
248
249 static const struct usb_device_id id_table_combined[] = {
250 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
251 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
252 { } /* Terminating entry */
253 };
254
255 static const struct usb_device_id id_table_2[] = {
256 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
257 { } /* Terminating entry */
258 };
259
260 static const struct usb_device_id id_table_4[] = {
261 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
262 { } /* Terminating entry */
263 };
264
265 MODULE_DEVICE_TABLE(usb, id_table_combined);
266
267 /* device info needed for the Digi serial converter */
268
269 static struct usb_serial_driver digi_acceleport_2_device = {
270 .driver = {
271 .owner = THIS_MODULE,
272 .name = "digi_2",
273 },
274 .description = "Digi 2 port USB adapter",
275 .id_table = id_table_2,
276 .num_ports = 3,
277 .open = digi_open,
278 .close = digi_close,
279 .dtr_rts = digi_dtr_rts,
280 .write = digi_write,
281 .write_room = digi_write_room,
282 .write_bulk_callback = digi_write_bulk_callback,
283 .read_bulk_callback = digi_read_bulk_callback,
284 .chars_in_buffer = digi_chars_in_buffer,
285 .throttle = digi_rx_throttle,
286 .unthrottle = digi_rx_unthrottle,
287 .set_termios = digi_set_termios,
288 .break_ctl = digi_break_ctl,
289 .tiocmget = digi_tiocmget,
290 .tiocmset = digi_tiocmset,
291 .attach = digi_startup,
292 .disconnect = digi_disconnect,
293 .release = digi_release,
294 .port_probe = digi_port_probe,
295 .port_remove = digi_port_remove,
296 };
297
298 static struct usb_serial_driver digi_acceleport_4_device = {
299 .driver = {
300 .owner = THIS_MODULE,
301 .name = "digi_4",
302 },
303 .description = "Digi 4 port USB adapter",
304 .id_table = id_table_4,
305 .num_ports = 4,
306 .open = digi_open,
307 .close = digi_close,
308 .write = digi_write,
309 .write_room = digi_write_room,
310 .write_bulk_callback = digi_write_bulk_callback,
311 .read_bulk_callback = digi_read_bulk_callback,
312 .chars_in_buffer = digi_chars_in_buffer,
313 .throttle = digi_rx_throttle,
314 .unthrottle = digi_rx_unthrottle,
315 .set_termios = digi_set_termios,
316 .break_ctl = digi_break_ctl,
317 .tiocmget = digi_tiocmget,
318 .tiocmset = digi_tiocmset,
319 .attach = digi_startup,
320 .disconnect = digi_disconnect,
321 .release = digi_release,
322 .port_probe = digi_port_probe,
323 .port_remove = digi_port_remove,
324 };
325
326 static struct usb_serial_driver * const serial_drivers[] = {
327 &digi_acceleport_2_device, &digi_acceleport_4_device, NULL
328 };
329
330 /* Functions */
331
332 /*
333 * Cond Wait Interruptible Timeout Irqrestore
334 *
335 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
336 * so that wake ups are not lost if they occur between the unlock
337 * and the sleep. In other words, spin_unlock_irqrestore and
338 * interruptible_sleep_on_timeout are "atomic" with respect to
339 * wake ups. This is used to implement condition variables.
340 *
341 * interruptible_sleep_on_timeout is deprecated and has been replaced
342 * with the equivalent code.
343 */
344
345 static long cond_wait_interruptible_timeout_irqrestore(
346 wait_queue_head_t *q, long timeout,
347 spinlock_t *lock, unsigned long flags)
348 __releases(lock)
349 {
350 DEFINE_WAIT(wait);
351
352 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
353 spin_unlock_irqrestore(lock, flags);
354 timeout = schedule_timeout(timeout);
355 finish_wait(q, &wait);
356
357 return timeout;
358 }
359
360
361 /*
362 * Digi Wakeup Write
363 *
364 * Wake up port, line discipline, and tty processes sleeping
365 * on writes.
366 */
367
368 static void digi_wakeup_write_lock(struct work_struct *work)
369 {
370 struct digi_port *priv =
371 container_of(work, struct digi_port, dp_wakeup_work);
372 struct usb_serial_port *port = priv->dp_port;
373 unsigned long flags;
374
375 spin_lock_irqsave(&priv->dp_port_lock, flags);
376 tty_port_tty_wakeup(&port->port);
377 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
378 }
379
380 /*
381 * Digi Write OOB Command
382 *
383 * Write commands on the out of band port. Commands are 4
384 * bytes each, multiple commands can be sent at once, and
385 * no command will be split across USB packets. Returns 0
386 * if successful, -EINTR if interrupted while sleeping and
387 * the interruptible flag is true, or a negative error
388 * returned by usb_submit_urb.
389 */
390
391 static int digi_write_oob_command(struct usb_serial_port *port,
392 unsigned char *buf, int count, int interruptible)
393 {
394 int ret = 0;
395 int len;
396 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
397 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
398 unsigned long flags = 0;
399
400 dev_dbg(&port->dev,
401 "digi_write_oob_command: TOP: port=%d, count=%d\n",
402 oob_priv->dp_port_num, count);
403
404 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
405 while (count > 0) {
406 while (oob_priv->dp_write_urb_in_use) {
407 cond_wait_interruptible_timeout_irqrestore(
408 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
409 &oob_priv->dp_port_lock, flags);
410 if (interruptible && signal_pending(current))
411 return -EINTR;
412 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
413 }
414
415 /* len must be a multiple of 4, so commands are not split */
416 len = min(count, oob_port->bulk_out_size);
417 if (len > 4)
418 len &= ~3;
419 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
420 oob_port->write_urb->transfer_buffer_length = len;
421 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
422 if (ret == 0) {
423 oob_priv->dp_write_urb_in_use = 1;
424 count -= len;
425 buf += len;
426 }
427 }
428 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
429 if (ret)
430 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
431 __func__, ret);
432 return ret;
433
434 }
435
436
437 /*
438 * Digi Write In Band Command
439 *
440 * Write commands on the given port. Commands are 4
441 * bytes each, multiple commands can be sent at once, and
442 * no command will be split across USB packets. If timeout
443 * is non-zero, write in band command will return after
444 * waiting unsuccessfully for the URB status to clear for
445 * timeout ticks. Returns 0 if successful, or a negative
446 * error returned by digi_write.
447 */
448
449 static int digi_write_inb_command(struct usb_serial_port *port,
450 unsigned char *buf, int count, unsigned long timeout)
451 {
452 int ret = 0;
453 int len;
454 struct digi_port *priv = usb_get_serial_port_data(port);
455 unsigned char *data = port->write_urb->transfer_buffer;
456 unsigned long flags = 0;
457
458 dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",
459 priv->dp_port_num, count);
460
461 if (timeout)
462 timeout += jiffies;
463 else
464 timeout = ULONG_MAX;
465
466 spin_lock_irqsave(&priv->dp_port_lock, flags);
467 while (count > 0 && ret == 0) {
468 while (priv->dp_write_urb_in_use &&
469 time_before(jiffies, timeout)) {
470 cond_wait_interruptible_timeout_irqrestore(
471 &port->write_wait, DIGI_RETRY_TIMEOUT,
472 &priv->dp_port_lock, flags);
473 if (signal_pending(current))
474 return -EINTR;
475 spin_lock_irqsave(&priv->dp_port_lock, flags);
476 }
477
478 /* len must be a multiple of 4 and small enough to */
479 /* guarantee the write will send buffered data first, */
480 /* so commands are in order with data and not split */
481 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
482 if (len > 4)
483 len &= ~3;
484
485 /* write any buffered data first */
486 if (priv->dp_out_buf_len > 0) {
487 data[0] = DIGI_CMD_SEND_DATA;
488 data[1] = priv->dp_out_buf_len;
489 memcpy(data + 2, priv->dp_out_buf,
490 priv->dp_out_buf_len);
491 memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
492 port->write_urb->transfer_buffer_length
493 = priv->dp_out_buf_len + 2 + len;
494 } else {
495 memcpy(data, buf, len);
496 port->write_urb->transfer_buffer_length = len;
497 }
498
499 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
500 if (ret == 0) {
501 priv->dp_write_urb_in_use = 1;
502 priv->dp_out_buf_len = 0;
503 count -= len;
504 buf += len;
505 }
506
507 }
508 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
509
510 if (ret)
511 dev_err(&port->dev,
512 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
513 __func__, ret, priv->dp_port_num);
514 return ret;
515 }
516
517
518 /*
519 * Digi Set Modem Signals
520 *
521 * Sets or clears DTR and RTS on the port, according to the
522 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
523 * for the modem_signals argument. Returns 0 if successful,
524 * -EINTR if interrupted while sleeping, or a non-zero error
525 * returned by usb_submit_urb.
526 */
527
528 static int digi_set_modem_signals(struct usb_serial_port *port,
529 unsigned int modem_signals, int interruptible)
530 {
531
532 int ret;
533 struct digi_port *port_priv = usb_get_serial_port_data(port);
534 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
535 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
536 unsigned char *data = oob_port->write_urb->transfer_buffer;
537 unsigned long flags = 0;
538
539
540 dev_dbg(&port->dev,
541 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n",
542 port_priv->dp_port_num, modem_signals);
543
544 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
545 spin_lock(&port_priv->dp_port_lock);
546
547 while (oob_priv->dp_write_urb_in_use) {
548 spin_unlock(&port_priv->dp_port_lock);
549 cond_wait_interruptible_timeout_irqrestore(
550 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
551 &oob_priv->dp_port_lock, flags);
552 if (interruptible && signal_pending(current))
553 return -EINTR;
554 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
555 spin_lock(&port_priv->dp_port_lock);
556 }
557 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
558 data[1] = port_priv->dp_port_num;
559 data[2] = (modem_signals & TIOCM_DTR) ?
560 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
561 data[3] = 0;
562 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
563 data[5] = port_priv->dp_port_num;
564 data[6] = (modem_signals & TIOCM_RTS) ?
565 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
566 data[7] = 0;
567
568 oob_port->write_urb->transfer_buffer_length = 8;
569
570 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
571 if (ret == 0) {
572 oob_priv->dp_write_urb_in_use = 1;
573 port_priv->dp_modem_signals =
574 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
575 | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
576 }
577 spin_unlock(&port_priv->dp_port_lock);
578 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
579 if (ret)
580 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
581 __func__, ret);
582 return ret;
583 }
584
585 /*
586 * Digi Transmit Idle
587 *
588 * Digi transmit idle waits, up to timeout ticks, for the transmitter
589 * to go idle. It returns 0 if successful or a negative error.
590 *
591 * There are race conditions here if more than one process is calling
592 * digi_transmit_idle on the same port at the same time. However, this
593 * is only called from close, and only one process can be in close on a
594 * port at a time, so its ok.
595 */
596
597 static int digi_transmit_idle(struct usb_serial_port *port,
598 unsigned long timeout)
599 {
600 int ret;
601 unsigned char buf[2];
602 struct digi_port *priv = usb_get_serial_port_data(port);
603 unsigned long flags = 0;
604
605 spin_lock_irqsave(&priv->dp_port_lock, flags);
606 priv->dp_transmit_idle = 0;
607 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
608
609 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
610 buf[1] = 0;
611
612 timeout += jiffies;
613
614 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
615 if (ret != 0)
616 return ret;
617
618 spin_lock_irqsave(&priv->dp_port_lock, flags);
619
620 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
621 cond_wait_interruptible_timeout_irqrestore(
622 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
623 &priv->dp_port_lock, flags);
624 if (signal_pending(current))
625 return -EINTR;
626 spin_lock_irqsave(&priv->dp_port_lock, flags);
627 }
628 priv->dp_transmit_idle = 0;
629 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
630 return 0;
631
632 }
633
634
635 static void digi_rx_throttle(struct tty_struct *tty)
636 {
637 unsigned long flags;
638 struct usb_serial_port *port = tty->driver_data;
639 struct digi_port *priv = usb_get_serial_port_data(port);
640
641 /* stop receiving characters by not resubmitting the read urb */
642 spin_lock_irqsave(&priv->dp_port_lock, flags);
643 priv->dp_throttled = 1;
644 priv->dp_throttle_restart = 0;
645 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
646 }
647
648
649 static void digi_rx_unthrottle(struct tty_struct *tty)
650 {
651 int ret = 0;
652 unsigned long flags;
653 struct usb_serial_port *port = tty->driver_data;
654 struct digi_port *priv = usb_get_serial_port_data(port);
655
656 spin_lock_irqsave(&priv->dp_port_lock, flags);
657
658 /* restart read chain */
659 if (priv->dp_throttle_restart)
660 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
661
662 /* turn throttle off */
663 priv->dp_throttled = 0;
664 priv->dp_throttle_restart = 0;
665
666 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
667
668 if (ret)
669 dev_err(&port->dev,
670 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
671 __func__, ret, priv->dp_port_num);
672 }
673
674
675 static void digi_set_termios(struct tty_struct *tty,
676 struct usb_serial_port *port, struct ktermios *old_termios)
677 {
678 struct digi_port *priv = usb_get_serial_port_data(port);
679 struct device *dev = &port->dev;
680 unsigned int iflag = tty->termios.c_iflag;
681 unsigned int cflag = tty->termios.c_cflag;
682 unsigned int old_iflag = old_termios->c_iflag;
683 unsigned int old_cflag = old_termios->c_cflag;
684 unsigned char buf[32];
685 unsigned int modem_signals;
686 int arg, ret;
687 int i = 0;
688 speed_t baud;
689
690 dev_dbg(dev,
691 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n",
692 priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
693
694 /* set baud rate */
695 baud = tty_get_baud_rate(tty);
696 if (baud != tty_termios_baud_rate(old_termios)) {
697 arg = -1;
698
699 /* reassert DTR and (maybe) RTS on transition from B0 */
700 if ((old_cflag&CBAUD) == B0) {
701 /* don't set RTS if using hardware flow control */
702 /* and throttling input */
703 modem_signals = TIOCM_DTR;
704 if (!(tty->termios.c_cflag & CRTSCTS) ||
705 !test_bit(TTY_THROTTLED, &tty->flags))
706 modem_signals |= TIOCM_RTS;
707 digi_set_modem_signals(port, modem_signals, 1);
708 }
709 switch (baud) {
710 /* drop DTR and RTS on transition to B0 */
711 case 0: digi_set_modem_signals(port, 0, 1); break;
712 case 50: arg = DIGI_BAUD_50; break;
713 case 75: arg = DIGI_BAUD_75; break;
714 case 110: arg = DIGI_BAUD_110; break;
715 case 150: arg = DIGI_BAUD_150; break;
716 case 200: arg = DIGI_BAUD_200; break;
717 case 300: arg = DIGI_BAUD_300; break;
718 case 600: arg = DIGI_BAUD_600; break;
719 case 1200: arg = DIGI_BAUD_1200; break;
720 case 1800: arg = DIGI_BAUD_1800; break;
721 case 2400: arg = DIGI_BAUD_2400; break;
722 case 4800: arg = DIGI_BAUD_4800; break;
723 case 9600: arg = DIGI_BAUD_9600; break;
724 case 19200: arg = DIGI_BAUD_19200; break;
725 case 38400: arg = DIGI_BAUD_38400; break;
726 case 57600: arg = DIGI_BAUD_57600; break;
727 case 115200: arg = DIGI_BAUD_115200; break;
728 case 230400: arg = DIGI_BAUD_230400; break;
729 case 460800: arg = DIGI_BAUD_460800; break;
730 default:
731 arg = DIGI_BAUD_9600;
732 baud = 9600;
733 break;
734 }
735 if (arg != -1) {
736 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
737 buf[i++] = priv->dp_port_num;
738 buf[i++] = arg;
739 buf[i++] = 0;
740 }
741 }
742 /* set parity */
743 tty->termios.c_cflag &= ~CMSPAR;
744
745 if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
746 if (cflag&PARENB) {
747 if (cflag&PARODD)
748 arg = DIGI_PARITY_ODD;
749 else
750 arg = DIGI_PARITY_EVEN;
751 } else {
752 arg = DIGI_PARITY_NONE;
753 }
754 buf[i++] = DIGI_CMD_SET_PARITY;
755 buf[i++] = priv->dp_port_num;
756 buf[i++] = arg;
757 buf[i++] = 0;
758 }
759 /* set word size */
760 if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
761 arg = -1;
762 switch (cflag&CSIZE) {
763 case CS5: arg = DIGI_WORD_SIZE_5; break;
764 case CS6: arg = DIGI_WORD_SIZE_6; break;
765 case CS7: arg = DIGI_WORD_SIZE_7; break;
766 case CS8: arg = DIGI_WORD_SIZE_8; break;
767 default:
768 dev_dbg(dev,
769 "digi_set_termios: can't handle word size %d\n",
770 (cflag&CSIZE));
771 break;
772 }
773
774 if (arg != -1) {
775 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
776 buf[i++] = priv->dp_port_num;
777 buf[i++] = arg;
778 buf[i++] = 0;
779 }
780
781 }
782
783 /* set stop bits */
784 if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
785
786 if ((cflag&CSTOPB))
787 arg = DIGI_STOP_BITS_2;
788 else
789 arg = DIGI_STOP_BITS_1;
790
791 buf[i++] = DIGI_CMD_SET_STOP_BITS;
792 buf[i++] = priv->dp_port_num;
793 buf[i++] = arg;
794 buf[i++] = 0;
795
796 }
797
798 /* set input flow control */
799 if ((iflag&IXOFF) != (old_iflag&IXOFF)
800 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
801 arg = 0;
802 if (iflag&IXOFF)
803 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
804 else
805 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
806
807 if (cflag&CRTSCTS) {
808 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
809
810 /* On USB-4 it is necessary to assert RTS prior */
811 /* to selecting RTS input flow control. */
812 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
813 buf[i++] = priv->dp_port_num;
814 buf[i++] = DIGI_RTS_ACTIVE;
815 buf[i++] = 0;
816
817 } else {
818 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
819 }
820 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
821 buf[i++] = priv->dp_port_num;
822 buf[i++] = arg;
823 buf[i++] = 0;
824 }
825
826 /* set output flow control */
827 if ((iflag & IXON) != (old_iflag & IXON)
828 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
829 arg = 0;
830 if (iflag & IXON)
831 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
832 else
833 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
834
835 if (cflag & CRTSCTS) {
836 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
837 } else {
838 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
839 tty->hw_stopped = 0;
840 }
841
842 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
843 buf[i++] = priv->dp_port_num;
844 buf[i++] = arg;
845 buf[i++] = 0;
846 }
847
848 /* set receive enable/disable */
849 if ((cflag & CREAD) != (old_cflag & CREAD)) {
850 if (cflag & CREAD)
851 arg = DIGI_ENABLE;
852 else
853 arg = DIGI_DISABLE;
854
855 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
856 buf[i++] = priv->dp_port_num;
857 buf[i++] = arg;
858 buf[i++] = 0;
859 }
860 ret = digi_write_oob_command(port, buf, i, 1);
861 if (ret != 0)
862 dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret);
863 tty_encode_baud_rate(tty, baud, baud);
864 }
865
866
867 static void digi_break_ctl(struct tty_struct *tty, int break_state)
868 {
869 struct usb_serial_port *port = tty->driver_data;
870 unsigned char buf[4];
871
872 buf[0] = DIGI_CMD_BREAK_CONTROL;
873 buf[1] = 2; /* length */
874 buf[2] = break_state ? 1 : 0;
875 buf[3] = 0; /* pad */
876 digi_write_inb_command(port, buf, 4, 0);
877 }
878
879
880 static int digi_tiocmget(struct tty_struct *tty)
881 {
882 struct usb_serial_port *port = tty->driver_data;
883 struct digi_port *priv = usb_get_serial_port_data(port);
884 unsigned int val;
885 unsigned long flags;
886
887 spin_lock_irqsave(&priv->dp_port_lock, flags);
888 val = priv->dp_modem_signals;
889 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
890 return val;
891 }
892
893
894 static int digi_tiocmset(struct tty_struct *tty,
895 unsigned int set, unsigned int clear)
896 {
897 struct usb_serial_port *port = tty->driver_data;
898 struct digi_port *priv = usb_get_serial_port_data(port);
899 unsigned int val;
900 unsigned long flags;
901
902 spin_lock_irqsave(&priv->dp_port_lock, flags);
903 val = (priv->dp_modem_signals & ~clear) | set;
904 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
905 return digi_set_modem_signals(port, val, 1);
906 }
907
908
909 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
910 const unsigned char *buf, int count)
911 {
912
913 int ret, data_len, new_len;
914 struct digi_port *priv = usb_get_serial_port_data(port);
915 unsigned char *data = port->write_urb->transfer_buffer;
916 unsigned long flags = 0;
917
918 dev_dbg(&port->dev,
919 "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld\n",
920 priv->dp_port_num, count, in_interrupt());
921
922 /* copy user data (which can sleep) before getting spin lock */
923 count = min(count, port->bulk_out_size-2);
924 count = min(64, count);
925
926 /* be sure only one write proceeds at a time */
927 /* there are races on the port private buffer */
928 spin_lock_irqsave(&priv->dp_port_lock, flags);
929
930 /* wait for urb status clear to submit another urb */
931 if (priv->dp_write_urb_in_use) {
932 /* buffer data if count is 1 (probably put_char) if possible */
933 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
934 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
935 new_len = 1;
936 } else {
937 new_len = 0;
938 }
939 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
940 return new_len;
941 }
942
943 /* allow space for any buffered data and for new data, up to */
944 /* transfer buffer size - 2 (for command and length bytes) */
945 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
946 data_len = new_len + priv->dp_out_buf_len;
947
948 if (data_len == 0) {
949 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
950 return 0;
951 }
952
953 port->write_urb->transfer_buffer_length = data_len+2;
954
955 *data++ = DIGI_CMD_SEND_DATA;
956 *data++ = data_len;
957
958 /* copy in buffered data first */
959 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
960 data += priv->dp_out_buf_len;
961
962 /* copy in new data */
963 memcpy(data, buf, new_len);
964
965 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
966 if (ret == 0) {
967 priv->dp_write_urb_in_use = 1;
968 ret = new_len;
969 priv->dp_out_buf_len = 0;
970 }
971
972 /* return length of new data written, or error */
973 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
974 if (ret < 0)
975 dev_err_console(port,
976 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
977 __func__, ret, priv->dp_port_num);
978 dev_dbg(&port->dev, "digi_write: returning %d\n", ret);
979 return ret;
980
981 }
982
983 static void digi_write_bulk_callback(struct urb *urb)
984 {
985
986 struct usb_serial_port *port = urb->context;
987 struct usb_serial *serial;
988 struct digi_port *priv;
989 struct digi_serial *serial_priv;
990 int ret = 0;
991 int status = urb->status;
992
993 /* port and serial sanity check */
994 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
995 pr_err("%s: port or port->private is NULL, status=%d\n",
996 __func__, status);
997 return;
998 }
999 serial = port->serial;
1000 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
1001 dev_err(&port->dev,
1002 "%s: serial or serial->private is NULL, status=%d\n",
1003 __func__, status);
1004 return;
1005 }
1006
1007 /* handle oob callback */
1008 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1009 dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n");
1010 spin_lock(&priv->dp_port_lock);
1011 priv->dp_write_urb_in_use = 0;
1012 wake_up_interruptible(&port->write_wait);
1013 spin_unlock(&priv->dp_port_lock);
1014 return;
1015 }
1016
1017 /* try to send any buffered data on this port */
1018 spin_lock(&priv->dp_port_lock);
1019 priv->dp_write_urb_in_use = 0;
1020 if (priv->dp_out_buf_len > 0) {
1021 *((unsigned char *)(port->write_urb->transfer_buffer))
1022 = (unsigned char)DIGI_CMD_SEND_DATA;
1023 *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
1024 = (unsigned char)priv->dp_out_buf_len;
1025 port->write_urb->transfer_buffer_length =
1026 priv->dp_out_buf_len + 2;
1027 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1028 priv->dp_out_buf_len);
1029 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1030 if (ret == 0) {
1031 priv->dp_write_urb_in_use = 1;
1032 priv->dp_out_buf_len = 0;
1033 }
1034 }
1035 /* wake up processes sleeping on writes immediately */
1036 tty_port_tty_wakeup(&port->port);
1037 /* also queue up a wakeup at scheduler time, in case we */
1038 /* lost the race in write_chan(). */
1039 schedule_work(&priv->dp_wakeup_work);
1040
1041 spin_unlock(&priv->dp_port_lock);
1042 if (ret && ret != -EPERM)
1043 dev_err_console(port,
1044 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1045 __func__, ret, priv->dp_port_num);
1046 }
1047
1048 static int digi_write_room(struct tty_struct *tty)
1049 {
1050 struct usb_serial_port *port = tty->driver_data;
1051 struct digi_port *priv = usb_get_serial_port_data(port);
1052 int room;
1053 unsigned long flags = 0;
1054
1055 spin_lock_irqsave(&priv->dp_port_lock, flags);
1056
1057 if (priv->dp_write_urb_in_use)
1058 room = 0;
1059 else
1060 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1061
1062 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1063 dev_dbg(&port->dev, "digi_write_room: port=%d, room=%d\n", priv->dp_port_num, room);
1064 return room;
1065
1066 }
1067
1068 static int digi_chars_in_buffer(struct tty_struct *tty)
1069 {
1070 struct usb_serial_port *port = tty->driver_data;
1071 struct digi_port *priv = usb_get_serial_port_data(port);
1072
1073 if (priv->dp_write_urb_in_use) {
1074 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1075 priv->dp_port_num, port->bulk_out_size - 2);
1076 /* return(port->bulk_out_size - 2); */
1077 return 256;
1078 } else {
1079 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1080 priv->dp_port_num, priv->dp_out_buf_len);
1081 return priv->dp_out_buf_len;
1082 }
1083
1084 }
1085
1086 static void digi_dtr_rts(struct usb_serial_port *port, int on)
1087 {
1088 /* Adjust DTR and RTS */
1089 digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
1090 }
1091
1092 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1093 {
1094 int ret;
1095 unsigned char buf[32];
1096 struct digi_port *priv = usb_get_serial_port_data(port);
1097 struct ktermios not_termios;
1098
1099 /* be sure the device is started up */
1100 if (digi_startup_device(port->serial) != 0)
1101 return -ENXIO;
1102
1103 /* read modem signals automatically whenever they change */
1104 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1105 buf[1] = priv->dp_port_num;
1106 buf[2] = DIGI_ENABLE;
1107 buf[3] = 0;
1108
1109 /* flush fifos */
1110 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1111 buf[5] = priv->dp_port_num;
1112 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1113 buf[7] = 0;
1114
1115 ret = digi_write_oob_command(port, buf, 8, 1);
1116 if (ret != 0)
1117 dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);
1118
1119 /* set termios settings */
1120 if (tty) {
1121 not_termios.c_cflag = ~tty->termios.c_cflag;
1122 not_termios.c_iflag = ~tty->termios.c_iflag;
1123 digi_set_termios(tty, port, &not_termios);
1124 }
1125 return 0;
1126 }
1127
1128
1129 static void digi_close(struct usb_serial_port *port)
1130 {
1131 DEFINE_WAIT(wait);
1132 int ret;
1133 unsigned char buf[32];
1134 struct digi_port *priv = usb_get_serial_port_data(port);
1135
1136 mutex_lock(&port->serial->disc_mutex);
1137 /* if disconnected, just clear flags */
1138 if (port->serial->disconnected)
1139 goto exit;
1140
1141 if (port->serial->dev) {
1142 /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1143 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1144
1145 /* disable input flow control */
1146 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1147 buf[1] = priv->dp_port_num;
1148 buf[2] = DIGI_DISABLE;
1149 buf[3] = 0;
1150
1151 /* disable output flow control */
1152 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1153 buf[5] = priv->dp_port_num;
1154 buf[6] = DIGI_DISABLE;
1155 buf[7] = 0;
1156
1157 /* disable reading modem signals automatically */
1158 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1159 buf[9] = priv->dp_port_num;
1160 buf[10] = DIGI_DISABLE;
1161 buf[11] = 0;
1162
1163 /* disable receive */
1164 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1165 buf[13] = priv->dp_port_num;
1166 buf[14] = DIGI_DISABLE;
1167 buf[15] = 0;
1168
1169 /* flush fifos */
1170 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1171 buf[17] = priv->dp_port_num;
1172 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1173 buf[19] = 0;
1174
1175 ret = digi_write_oob_command(port, buf, 20, 0);
1176 if (ret != 0)
1177 dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n", ret);
1178
1179 /* wait for final commands on oob port to complete */
1180 prepare_to_wait(&priv->dp_flush_wait, &wait,
1181 TASK_INTERRUPTIBLE);
1182 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1183 finish_wait(&priv->dp_flush_wait, &wait);
1184
1185 /* shutdown any outstanding bulk writes */
1186 usb_kill_urb(port->write_urb);
1187 }
1188 exit:
1189 spin_lock_irq(&priv->dp_port_lock);
1190 priv->dp_write_urb_in_use = 0;
1191 wake_up_interruptible(&priv->dp_close_wait);
1192 spin_unlock_irq(&priv->dp_port_lock);
1193 mutex_unlock(&port->serial->disc_mutex);
1194 }
1195
1196
1197 /*
1198 * Digi Startup Device
1199 *
1200 * Starts reads on all ports. Must be called AFTER startup, with
1201 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1202 */
1203
1204 static int digi_startup_device(struct usb_serial *serial)
1205 {
1206 int i, ret = 0;
1207 struct digi_serial *serial_priv = usb_get_serial_data(serial);
1208 struct usb_serial_port *port;
1209
1210 /* be sure this happens exactly once */
1211 spin_lock(&serial_priv->ds_serial_lock);
1212 if (serial_priv->ds_device_started) {
1213 spin_unlock(&serial_priv->ds_serial_lock);
1214 return 0;
1215 }
1216 serial_priv->ds_device_started = 1;
1217 spin_unlock(&serial_priv->ds_serial_lock);
1218
1219 /* start reading from each bulk in endpoint for the device */
1220 /* set USB_DISABLE_SPD flag for write bulk urbs */
1221 for (i = 0; i < serial->type->num_ports + 1; i++) {
1222 port = serial->port[i];
1223 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1224 if (ret != 0) {
1225 dev_err(&port->dev,
1226 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1227 __func__, ret, i);
1228 break;
1229 }
1230 }
1231 return ret;
1232 }
1233
1234 static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
1235 {
1236 struct digi_port *priv;
1237
1238 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1239 if (!priv)
1240 return -ENOMEM;
1241
1242 spin_lock_init(&priv->dp_port_lock);
1243 priv->dp_port_num = port_num;
1244 init_waitqueue_head(&priv->dp_modem_change_wait);
1245 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1246 init_waitqueue_head(&priv->dp_flush_wait);
1247 init_waitqueue_head(&priv->dp_close_wait);
1248 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1249 priv->dp_port = port;
1250
1251 init_waitqueue_head(&port->write_wait);
1252
1253 usb_set_serial_port_data(port, priv);
1254
1255 return 0;
1256 }
1257
1258 static int digi_startup(struct usb_serial *serial)
1259 {
1260 struct digi_serial *serial_priv;
1261 int ret;
1262
1263 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
1264 if (!serial_priv)
1265 return -ENOMEM;
1266
1267 spin_lock_init(&serial_priv->ds_serial_lock);
1268 serial_priv->ds_oob_port_num = serial->type->num_ports;
1269 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1270
1271 ret = digi_port_init(serial_priv->ds_oob_port,
1272 serial_priv->ds_oob_port_num);
1273 if (ret) {
1274 kfree(serial_priv);
1275 return ret;
1276 }
1277
1278 usb_set_serial_data(serial, serial_priv);
1279
1280 return 0;
1281 }
1282
1283
1284 static void digi_disconnect(struct usb_serial *serial)
1285 {
1286 int i;
1287
1288 /* stop reads and writes on all ports */
1289 for (i = 0; i < serial->type->num_ports + 1; i++) {
1290 usb_kill_urb(serial->port[i]->read_urb);
1291 usb_kill_urb(serial->port[i]->write_urb);
1292 }
1293 }
1294
1295
1296 static void digi_release(struct usb_serial *serial)
1297 {
1298 struct digi_serial *serial_priv;
1299 struct digi_port *priv;
1300
1301 serial_priv = usb_get_serial_data(serial);
1302
1303 priv = usb_get_serial_port_data(serial_priv->ds_oob_port);
1304 kfree(priv);
1305
1306 kfree(serial_priv);
1307 }
1308
1309 static int digi_port_probe(struct usb_serial_port *port)
1310 {
1311 unsigned port_num;
1312
1313 port_num = port->number - port->serial->minor;
1314
1315 return digi_port_init(port, port_num);
1316 }
1317
1318 static int digi_port_remove(struct usb_serial_port *port)
1319 {
1320 struct digi_port *priv;
1321
1322 priv = usb_get_serial_port_data(port);
1323 kfree(priv);
1324
1325 return 0;
1326 }
1327
1328 static void digi_read_bulk_callback(struct urb *urb)
1329 {
1330 struct usb_serial_port *port = urb->context;
1331 struct digi_port *priv;
1332 struct digi_serial *serial_priv;
1333 int ret;
1334 int status = urb->status;
1335
1336 /* port sanity check, do not resubmit if port is not valid */
1337 if (port == NULL)
1338 return;
1339 priv = usb_get_serial_port_data(port);
1340 if (priv == NULL) {
1341 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1342 __func__, status);
1343 return;
1344 }
1345 if (port->serial == NULL ||
1346 (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1347 dev_err(&port->dev, "%s: serial is bad or serial->private "
1348 "is NULL, status=%d\n", __func__, status);
1349 return;
1350 }
1351
1352 /* do not resubmit urb if it has any status error */
1353 if (status) {
1354 dev_err(&port->dev,
1355 "%s: nonzero read bulk status: status=%d, port=%d\n",
1356 __func__, status, priv->dp_port_num);
1357 return;
1358 }
1359
1360 /* handle oob or inb callback, do not resubmit if error */
1361 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1362 if (digi_read_oob_callback(urb) != 0)
1363 return;
1364 } else {
1365 if (digi_read_inb_callback(urb) != 0)
1366 return;
1367 }
1368
1369 /* continue read */
1370 ret = usb_submit_urb(urb, GFP_ATOMIC);
1371 if (ret != 0 && ret != -EPERM) {
1372 dev_err(&port->dev,
1373 "%s: failed resubmitting urb, ret=%d, port=%d\n",
1374 __func__, ret, priv->dp_port_num);
1375 }
1376
1377 }
1378
1379 /*
1380 * Digi Read INB Callback
1381 *
1382 * Digi Read INB Callback handles reads on the in band ports, sending
1383 * the data on to the tty subsystem. When called we know port and
1384 * port->private are not NULL and port->serial has been validated.
1385 * It returns 0 if successful, 1 if successful but the port is
1386 * throttled, and -1 if the sanity checks failed.
1387 */
1388
1389 static int digi_read_inb_callback(struct urb *urb)
1390 {
1391 struct usb_serial_port *port = urb->context;
1392 struct digi_port *priv = usb_get_serial_port_data(port);
1393 int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1394 int len = ((unsigned char *)urb->transfer_buffer)[1];
1395 int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1396 unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3;
1397 int flag, throttled;
1398 int status = urb->status;
1399
1400 /* do not process callbacks on closed ports */
1401 /* but do continue the read chain */
1402 if (urb->status == -ENOENT)
1403 return 0;
1404
1405 /* short/multiple packet check */
1406 if (urb->actual_length != len + 2) {
1407 dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, "
1408 "status=%d, port=%d, opcode=%d, len=%d, "
1409 "actual_length=%d, status=%d\n", __func__, status,
1410 priv->dp_port_num, opcode, len, urb->actual_length,
1411 port_status);
1412 return -1;
1413 }
1414
1415 spin_lock(&priv->dp_port_lock);
1416
1417 /* check for throttle; if set, do not resubmit read urb */
1418 /* indicate the read chain needs to be restarted on unthrottle */
1419 throttled = priv->dp_throttled;
1420 if (throttled)
1421 priv->dp_throttle_restart = 1;
1422
1423 /* receive data */
1424 if (opcode == DIGI_CMD_RECEIVE_DATA) {
1425 /* get flag from port_status */
1426 flag = 0;
1427
1428 /* overrun is special, not associated with a char */
1429 if (port_status & DIGI_OVERRUN_ERROR)
1430 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1431
1432 /* break takes precedence over parity, */
1433 /* which takes precedence over framing errors */
1434 if (port_status & DIGI_BREAK_ERROR)
1435 flag = TTY_BREAK;
1436 else if (port_status & DIGI_PARITY_ERROR)
1437 flag = TTY_PARITY;
1438 else if (port_status & DIGI_FRAMING_ERROR)
1439 flag = TTY_FRAME;
1440
1441 /* data length is len-1 (one byte of len is port_status) */
1442 --len;
1443 if (len > 0) {
1444 tty_insert_flip_string_fixed_flag(&port->port, data,
1445 flag, len);
1446 tty_flip_buffer_push(&port->port);
1447 }
1448 }
1449 spin_unlock(&priv->dp_port_lock);
1450
1451 if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1452 dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__);
1453 else if (opcode != DIGI_CMD_RECEIVE_DATA)
1454 dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode);
1455
1456 return throttled ? 1 : 0;
1457
1458 }
1459
1460
1461 /*
1462 * Digi Read OOB Callback
1463 *
1464 * Digi Read OOB Callback handles reads on the out of band port.
1465 * When called we know port and port->private are not NULL and
1466 * the port->serial is valid. It returns 0 if successful, and
1467 * -1 if the sanity checks failed.
1468 */
1469
1470 static int digi_read_oob_callback(struct urb *urb)
1471 {
1472
1473 struct usb_serial_port *port = urb->context;
1474 struct usb_serial *serial = port->serial;
1475 struct tty_struct *tty;
1476 struct digi_port *priv = usb_get_serial_port_data(port);
1477 int opcode, line, status, val;
1478 int i;
1479 unsigned int rts;
1480
1481 /* handle each oob command */
1482 for (i = 0; i < urb->actual_length - 3;) {
1483 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1484 line = ((unsigned char *)urb->transfer_buffer)[i++];
1485 status = ((unsigned char *)urb->transfer_buffer)[i++];
1486 val = ((unsigned char *)urb->transfer_buffer)[i++];
1487
1488 dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",
1489 opcode, line, status, val);
1490
1491 if (status != 0 || line >= serial->type->num_ports)
1492 continue;
1493
1494 port = serial->port[line];
1495
1496 priv = usb_get_serial_port_data(port);
1497 if (priv == NULL)
1498 return -1;
1499
1500 tty = tty_port_tty_get(&port->port);
1501
1502 rts = 0;
1503 if (tty)
1504 rts = tty->termios.c_cflag & CRTSCTS;
1505
1506 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1507 spin_lock(&priv->dp_port_lock);
1508 /* convert from digi flags to termiox flags */
1509 if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1510 priv->dp_modem_signals |= TIOCM_CTS;
1511 /* port must be open to use tty struct */
1512 if (rts) {
1513 tty->hw_stopped = 0;
1514 tty_port_tty_wakeup(&port->port);
1515 }
1516 } else {
1517 priv->dp_modem_signals &= ~TIOCM_CTS;
1518 /* port must be open to use tty struct */
1519 if (rts)
1520 tty->hw_stopped = 1;
1521 }
1522 if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1523 priv->dp_modem_signals |= TIOCM_DSR;
1524 else
1525 priv->dp_modem_signals &= ~TIOCM_DSR;
1526 if (val & DIGI_READ_INPUT_SIGNALS_RI)
1527 priv->dp_modem_signals |= TIOCM_RI;
1528 else
1529 priv->dp_modem_signals &= ~TIOCM_RI;
1530 if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1531 priv->dp_modem_signals |= TIOCM_CD;
1532 else
1533 priv->dp_modem_signals &= ~TIOCM_CD;
1534
1535 wake_up_interruptible(&priv->dp_modem_change_wait);
1536 spin_unlock(&priv->dp_port_lock);
1537 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1538 spin_lock(&priv->dp_port_lock);
1539 priv->dp_transmit_idle = 1;
1540 wake_up_interruptible(&priv->dp_transmit_idle_wait);
1541 spin_unlock(&priv->dp_port_lock);
1542 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1543 wake_up_interruptible(&priv->dp_flush_wait);
1544 }
1545 tty_kref_put(tty);
1546 }
1547 return 0;
1548
1549 }
1550
1551 module_usb_serial_driver(serial_drivers, id_table_combined);
1552
1553 MODULE_AUTHOR(DRIVER_AUTHOR);
1554 MODULE_DESCRIPTION(DRIVER_DESC);
1555 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)