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[mirror_ubuntu-bionic-kernel.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(struct usb_serial_port *port);
214 static void digi_wakeup_write_lock(struct work_struct *work);
215 static int digi_write_oob_command(struct usb_serial_port *port,
216 unsigned char *buf, int count, int interruptible);
217 static int digi_write_inb_command(struct usb_serial_port *port,
218 unsigned char *buf, int count, unsigned long timeout);
219 static int digi_set_modem_signals(struct usb_serial_port *port,
220 unsigned int modem_signals, int interruptible);
221 static int digi_transmit_idle(struct usb_serial_port *port,
222 unsigned long timeout);
223 static void digi_rx_throttle(struct tty_struct *tty);
224 static void digi_rx_unthrottle(struct tty_struct *tty);
225 static void digi_set_termios(struct tty_struct *tty,
226 struct usb_serial_port *port, struct ktermios *old_termios);
227 static void digi_break_ctl(struct tty_struct *tty, int break_state);
228 static int digi_tiocmget(struct tty_struct *tty);
229 static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
230 unsigned int clear);
231 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
232 const unsigned char *buf, int count);
233 static void digi_write_bulk_callback(struct urb *urb);
234 static int digi_write_room(struct tty_struct *tty);
235 static int digi_chars_in_buffer(struct tty_struct *tty);
236 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
237 static void digi_close(struct usb_serial_port *port);
238 static void digi_dtr_rts(struct usb_serial_port *port, int on);
239 static int digi_startup_device(struct usb_serial *serial);
240 static int digi_startup(struct usb_serial *serial);
241 static void digi_disconnect(struct usb_serial *serial);
242 static void digi_release(struct usb_serial *serial);
243 static int digi_port_probe(struct usb_serial_port *port);
244 static int digi_port_remove(struct usb_serial_port *port);
245 static void digi_read_bulk_callback(struct urb *urb);
246 static int digi_read_inb_callback(struct urb *urb);
247 static int digi_read_oob_callback(struct urb *urb);
248
249
250 static const struct usb_device_id id_table_combined[] = {
251 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
252 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
253 { } /* Terminating entry */
254 };
255
256 static const struct usb_device_id id_table_2[] = {
257 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
258 { } /* Terminating entry */
259 };
260
261 static const struct usb_device_id id_table_4[] = {
262 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
263 { } /* Terminating entry */
264 };
265
266 MODULE_DEVICE_TABLE(usb, id_table_combined);
267
268 /* device info needed for the Digi serial converter */
269
270 static struct usb_serial_driver digi_acceleport_2_device = {
271 .driver = {
272 .owner = THIS_MODULE,
273 .name = "digi_2",
274 },
275 .description = "Digi 2 port USB adapter",
276 .id_table = id_table_2,
277 .num_ports = 3,
278 .open = digi_open,
279 .close = digi_close,
280 .dtr_rts = digi_dtr_rts,
281 .write = digi_write,
282 .write_room = digi_write_room,
283 .write_bulk_callback = digi_write_bulk_callback,
284 .read_bulk_callback = digi_read_bulk_callback,
285 .chars_in_buffer = digi_chars_in_buffer,
286 .throttle = digi_rx_throttle,
287 .unthrottle = digi_rx_unthrottle,
288 .set_termios = digi_set_termios,
289 .break_ctl = digi_break_ctl,
290 .tiocmget = digi_tiocmget,
291 .tiocmset = digi_tiocmset,
292 .attach = digi_startup,
293 .disconnect = digi_disconnect,
294 .release = digi_release,
295 .port_probe = digi_port_probe,
296 .port_remove = digi_port_remove,
297 };
298
299 static struct usb_serial_driver digi_acceleport_4_device = {
300 .driver = {
301 .owner = THIS_MODULE,
302 .name = "digi_4",
303 },
304 .description = "Digi 4 port USB adapter",
305 .id_table = id_table_4,
306 .num_ports = 4,
307 .open = digi_open,
308 .close = digi_close,
309 .write = digi_write,
310 .write_room = digi_write_room,
311 .write_bulk_callback = digi_write_bulk_callback,
312 .read_bulk_callback = digi_read_bulk_callback,
313 .chars_in_buffer = digi_chars_in_buffer,
314 .throttle = digi_rx_throttle,
315 .unthrottle = digi_rx_unthrottle,
316 .set_termios = digi_set_termios,
317 .break_ctl = digi_break_ctl,
318 .tiocmget = digi_tiocmget,
319 .tiocmset = digi_tiocmset,
320 .attach = digi_startup,
321 .disconnect = digi_disconnect,
322 .release = digi_release,
323 .port_probe = digi_port_probe,
324 .port_remove = digi_port_remove,
325 };
326
327 static struct usb_serial_driver * const serial_drivers[] = {
328 &digi_acceleport_2_device, &digi_acceleport_4_device, NULL
329 };
330
331 /* Functions */
332
333 /*
334 * Cond Wait Interruptible Timeout Irqrestore
335 *
336 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
337 * so that wake ups are not lost if they occur between the unlock
338 * and the sleep. In other words, spin_unlock_irqrestore and
339 * interruptible_sleep_on_timeout are "atomic" with respect to
340 * wake ups. This is used to implement condition variables.
341 *
342 * interruptible_sleep_on_timeout is deprecated and has been replaced
343 * with the equivalent code.
344 */
345
346 static long cond_wait_interruptible_timeout_irqrestore(
347 wait_queue_head_t *q, long timeout,
348 spinlock_t *lock, unsigned long flags)
349 __releases(lock)
350 {
351 DEFINE_WAIT(wait);
352
353 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
354 spin_unlock_irqrestore(lock, flags);
355 timeout = schedule_timeout(timeout);
356 finish_wait(q, &wait);
357
358 return timeout;
359 }
360
361
362 /*
363 * Digi Wakeup Write
364 *
365 * Wake up port, line discipline, and tty processes sleeping
366 * on writes.
367 */
368
369 static void digi_wakeup_write_lock(struct work_struct *work)
370 {
371 struct digi_port *priv =
372 container_of(work, struct digi_port, dp_wakeup_work);
373 struct usb_serial_port *port = priv->dp_port;
374 unsigned long flags;
375
376 spin_lock_irqsave(&priv->dp_port_lock, flags);
377 digi_wakeup_write(port);
378 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
379 }
380
381 static void digi_wakeup_write(struct usb_serial_port *port)
382 {
383 struct tty_struct *tty = tty_port_tty_get(&port->port);
384 if (tty) {
385 tty_wakeup(tty);
386 tty_kref_put(tty);
387 }
388 }
389
390
391 /*
392 * Digi Write OOB Command
393 *
394 * Write commands on the out of band port. Commands are 4
395 * bytes each, multiple commands can be sent at once, and
396 * no command will be split across USB packets. Returns 0
397 * if successful, -EINTR if interrupted while sleeping and
398 * the interruptible flag is true, or a negative error
399 * returned by usb_submit_urb.
400 */
401
402 static int digi_write_oob_command(struct usb_serial_port *port,
403 unsigned char *buf, int count, int interruptible)
404 {
405 int ret = 0;
406 int len;
407 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
408 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
409 unsigned long flags = 0;
410
411 dev_dbg(&port->dev,
412 "digi_write_oob_command: TOP: port=%d, count=%d\n",
413 oob_priv->dp_port_num, count);
414
415 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
416 while (count > 0) {
417 while (oob_priv->dp_write_urb_in_use) {
418 cond_wait_interruptible_timeout_irqrestore(
419 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
420 &oob_priv->dp_port_lock, flags);
421 if (interruptible && signal_pending(current))
422 return -EINTR;
423 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
424 }
425
426 /* len must be a multiple of 4, so commands are not split */
427 len = min(count, oob_port->bulk_out_size);
428 if (len > 4)
429 len &= ~3;
430 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
431 oob_port->write_urb->transfer_buffer_length = len;
432 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
433 if (ret == 0) {
434 oob_priv->dp_write_urb_in_use = 1;
435 count -= len;
436 buf += len;
437 }
438 }
439 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
440 if (ret)
441 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
442 __func__, ret);
443 return ret;
444
445 }
446
447
448 /*
449 * Digi Write In Band Command
450 *
451 * Write commands on the given port. Commands are 4
452 * bytes each, multiple commands can be sent at once, and
453 * no command will be split across USB packets. If timeout
454 * is non-zero, write in band command will return after
455 * waiting unsuccessfully for the URB status to clear for
456 * timeout ticks. Returns 0 if successful, or a negative
457 * error returned by digi_write.
458 */
459
460 static int digi_write_inb_command(struct usb_serial_port *port,
461 unsigned char *buf, int count, unsigned long timeout)
462 {
463 int ret = 0;
464 int len;
465 struct digi_port *priv = usb_get_serial_port_data(port);
466 unsigned char *data = port->write_urb->transfer_buffer;
467 unsigned long flags = 0;
468
469 dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",
470 priv->dp_port_num, count);
471
472 if (timeout)
473 timeout += jiffies;
474 else
475 timeout = ULONG_MAX;
476
477 spin_lock_irqsave(&priv->dp_port_lock, flags);
478 while (count > 0 && ret == 0) {
479 while (priv->dp_write_urb_in_use &&
480 time_before(jiffies, timeout)) {
481 cond_wait_interruptible_timeout_irqrestore(
482 &port->write_wait, DIGI_RETRY_TIMEOUT,
483 &priv->dp_port_lock, flags);
484 if (signal_pending(current))
485 return -EINTR;
486 spin_lock_irqsave(&priv->dp_port_lock, flags);
487 }
488
489 /* len must be a multiple of 4 and small enough to */
490 /* guarantee the write will send buffered data first, */
491 /* so commands are in order with data and not split */
492 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
493 if (len > 4)
494 len &= ~3;
495
496 /* write any buffered data first */
497 if (priv->dp_out_buf_len > 0) {
498 data[0] = DIGI_CMD_SEND_DATA;
499 data[1] = priv->dp_out_buf_len;
500 memcpy(data + 2, priv->dp_out_buf,
501 priv->dp_out_buf_len);
502 memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
503 port->write_urb->transfer_buffer_length
504 = priv->dp_out_buf_len + 2 + len;
505 } else {
506 memcpy(data, buf, len);
507 port->write_urb->transfer_buffer_length = len;
508 }
509
510 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
511 if (ret == 0) {
512 priv->dp_write_urb_in_use = 1;
513 priv->dp_out_buf_len = 0;
514 count -= len;
515 buf += len;
516 }
517
518 }
519 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
520
521 if (ret)
522 dev_err(&port->dev,
523 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
524 __func__, ret, priv->dp_port_num);
525 return ret;
526 }
527
528
529 /*
530 * Digi Set Modem Signals
531 *
532 * Sets or clears DTR and RTS on the port, according to the
533 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
534 * for the modem_signals argument. Returns 0 if successful,
535 * -EINTR if interrupted while sleeping, or a non-zero error
536 * returned by usb_submit_urb.
537 */
538
539 static int digi_set_modem_signals(struct usb_serial_port *port,
540 unsigned int modem_signals, int interruptible)
541 {
542
543 int ret;
544 struct digi_port *port_priv = usb_get_serial_port_data(port);
545 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
546 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
547 unsigned char *data = oob_port->write_urb->transfer_buffer;
548 unsigned long flags = 0;
549
550
551 dev_dbg(&port->dev,
552 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n",
553 port_priv->dp_port_num, modem_signals);
554
555 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
556 spin_lock(&port_priv->dp_port_lock);
557
558 while (oob_priv->dp_write_urb_in_use) {
559 spin_unlock(&port_priv->dp_port_lock);
560 cond_wait_interruptible_timeout_irqrestore(
561 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
562 &oob_priv->dp_port_lock, flags);
563 if (interruptible && signal_pending(current))
564 return -EINTR;
565 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
566 spin_lock(&port_priv->dp_port_lock);
567 }
568 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
569 data[1] = port_priv->dp_port_num;
570 data[2] = (modem_signals & TIOCM_DTR) ?
571 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
572 data[3] = 0;
573 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
574 data[5] = port_priv->dp_port_num;
575 data[6] = (modem_signals & TIOCM_RTS) ?
576 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
577 data[7] = 0;
578
579 oob_port->write_urb->transfer_buffer_length = 8;
580
581 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
582 if (ret == 0) {
583 oob_priv->dp_write_urb_in_use = 1;
584 port_priv->dp_modem_signals =
585 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
586 | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
587 }
588 spin_unlock(&port_priv->dp_port_lock);
589 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
590 if (ret)
591 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
592 __func__, ret);
593 return ret;
594 }
595
596 /*
597 * Digi Transmit Idle
598 *
599 * Digi transmit idle waits, up to timeout ticks, for the transmitter
600 * to go idle. It returns 0 if successful or a negative error.
601 *
602 * There are race conditions here if more than one process is calling
603 * digi_transmit_idle on the same port at the same time. However, this
604 * is only called from close, and only one process can be in close on a
605 * port at a time, so its ok.
606 */
607
608 static int digi_transmit_idle(struct usb_serial_port *port,
609 unsigned long timeout)
610 {
611 int ret;
612 unsigned char buf[2];
613 struct digi_port *priv = usb_get_serial_port_data(port);
614 unsigned long flags = 0;
615
616 spin_lock_irqsave(&priv->dp_port_lock, flags);
617 priv->dp_transmit_idle = 0;
618 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
619
620 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
621 buf[1] = 0;
622
623 timeout += jiffies;
624
625 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
626 if (ret != 0)
627 return ret;
628
629 spin_lock_irqsave(&priv->dp_port_lock, flags);
630
631 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
632 cond_wait_interruptible_timeout_irqrestore(
633 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
634 &priv->dp_port_lock, flags);
635 if (signal_pending(current))
636 return -EINTR;
637 spin_lock_irqsave(&priv->dp_port_lock, flags);
638 }
639 priv->dp_transmit_idle = 0;
640 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
641 return 0;
642
643 }
644
645
646 static void digi_rx_throttle(struct tty_struct *tty)
647 {
648 unsigned long flags;
649 struct usb_serial_port *port = tty->driver_data;
650 struct digi_port *priv = usb_get_serial_port_data(port);
651
652 /* stop receiving characters by not resubmitting the read urb */
653 spin_lock_irqsave(&priv->dp_port_lock, flags);
654 priv->dp_throttled = 1;
655 priv->dp_throttle_restart = 0;
656 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
657 }
658
659
660 static void digi_rx_unthrottle(struct tty_struct *tty)
661 {
662 int ret = 0;
663 unsigned long flags;
664 struct usb_serial_port *port = tty->driver_data;
665 struct digi_port *priv = usb_get_serial_port_data(port);
666
667 spin_lock_irqsave(&priv->dp_port_lock, flags);
668
669 /* restart read chain */
670 if (priv->dp_throttle_restart)
671 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
672
673 /* turn throttle off */
674 priv->dp_throttled = 0;
675 priv->dp_throttle_restart = 0;
676
677 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
678
679 if (ret)
680 dev_err(&port->dev,
681 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
682 __func__, ret, priv->dp_port_num);
683 }
684
685
686 static void digi_set_termios(struct tty_struct *tty,
687 struct usb_serial_port *port, struct ktermios *old_termios)
688 {
689 struct digi_port *priv = usb_get_serial_port_data(port);
690 struct device *dev = &port->dev;
691 unsigned int iflag = tty->termios.c_iflag;
692 unsigned int cflag = tty->termios.c_cflag;
693 unsigned int old_iflag = old_termios->c_iflag;
694 unsigned int old_cflag = old_termios->c_cflag;
695 unsigned char buf[32];
696 unsigned int modem_signals;
697 int arg, ret;
698 int i = 0;
699 speed_t baud;
700
701 dev_dbg(dev,
702 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n",
703 priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
704
705 /* set baud rate */
706 baud = tty_get_baud_rate(tty);
707 if (baud != tty_termios_baud_rate(old_termios)) {
708 arg = -1;
709
710 /* reassert DTR and (maybe) RTS on transition from B0 */
711 if ((old_cflag&CBAUD) == B0) {
712 /* don't set RTS if using hardware flow control */
713 /* and throttling input */
714 modem_signals = TIOCM_DTR;
715 if (!(tty->termios.c_cflag & CRTSCTS) ||
716 !test_bit(TTY_THROTTLED, &tty->flags))
717 modem_signals |= TIOCM_RTS;
718 digi_set_modem_signals(port, modem_signals, 1);
719 }
720 switch (baud) {
721 /* drop DTR and RTS on transition to B0 */
722 case 0: digi_set_modem_signals(port, 0, 1); break;
723 case 50: arg = DIGI_BAUD_50; break;
724 case 75: arg = DIGI_BAUD_75; break;
725 case 110: arg = DIGI_BAUD_110; break;
726 case 150: arg = DIGI_BAUD_150; break;
727 case 200: arg = DIGI_BAUD_200; break;
728 case 300: arg = DIGI_BAUD_300; break;
729 case 600: arg = DIGI_BAUD_600; break;
730 case 1200: arg = DIGI_BAUD_1200; break;
731 case 1800: arg = DIGI_BAUD_1800; break;
732 case 2400: arg = DIGI_BAUD_2400; break;
733 case 4800: arg = DIGI_BAUD_4800; break;
734 case 9600: arg = DIGI_BAUD_9600; break;
735 case 19200: arg = DIGI_BAUD_19200; break;
736 case 38400: arg = DIGI_BAUD_38400; break;
737 case 57600: arg = DIGI_BAUD_57600; break;
738 case 115200: arg = DIGI_BAUD_115200; break;
739 case 230400: arg = DIGI_BAUD_230400; break;
740 case 460800: arg = DIGI_BAUD_460800; break;
741 default:
742 arg = DIGI_BAUD_9600;
743 baud = 9600;
744 break;
745 }
746 if (arg != -1) {
747 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
748 buf[i++] = priv->dp_port_num;
749 buf[i++] = arg;
750 buf[i++] = 0;
751 }
752 }
753 /* set parity */
754 tty->termios.c_cflag &= ~CMSPAR;
755
756 if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
757 if (cflag&PARENB) {
758 if (cflag&PARODD)
759 arg = DIGI_PARITY_ODD;
760 else
761 arg = DIGI_PARITY_EVEN;
762 } else {
763 arg = DIGI_PARITY_NONE;
764 }
765 buf[i++] = DIGI_CMD_SET_PARITY;
766 buf[i++] = priv->dp_port_num;
767 buf[i++] = arg;
768 buf[i++] = 0;
769 }
770 /* set word size */
771 if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
772 arg = -1;
773 switch (cflag&CSIZE) {
774 case CS5: arg = DIGI_WORD_SIZE_5; break;
775 case CS6: arg = DIGI_WORD_SIZE_6; break;
776 case CS7: arg = DIGI_WORD_SIZE_7; break;
777 case CS8: arg = DIGI_WORD_SIZE_8; break;
778 default:
779 dev_dbg(dev,
780 "digi_set_termios: can't handle word size %d\n",
781 (cflag&CSIZE));
782 break;
783 }
784
785 if (arg != -1) {
786 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
787 buf[i++] = priv->dp_port_num;
788 buf[i++] = arg;
789 buf[i++] = 0;
790 }
791
792 }
793
794 /* set stop bits */
795 if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
796
797 if ((cflag&CSTOPB))
798 arg = DIGI_STOP_BITS_2;
799 else
800 arg = DIGI_STOP_BITS_1;
801
802 buf[i++] = DIGI_CMD_SET_STOP_BITS;
803 buf[i++] = priv->dp_port_num;
804 buf[i++] = arg;
805 buf[i++] = 0;
806
807 }
808
809 /* set input flow control */
810 if ((iflag&IXOFF) != (old_iflag&IXOFF)
811 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
812 arg = 0;
813 if (iflag&IXOFF)
814 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
815 else
816 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
817
818 if (cflag&CRTSCTS) {
819 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
820
821 /* On USB-4 it is necessary to assert RTS prior */
822 /* to selecting RTS input flow control. */
823 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
824 buf[i++] = priv->dp_port_num;
825 buf[i++] = DIGI_RTS_ACTIVE;
826 buf[i++] = 0;
827
828 } else {
829 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
830 }
831 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
832 buf[i++] = priv->dp_port_num;
833 buf[i++] = arg;
834 buf[i++] = 0;
835 }
836
837 /* set output flow control */
838 if ((iflag & IXON) != (old_iflag & IXON)
839 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
840 arg = 0;
841 if (iflag & IXON)
842 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
843 else
844 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
845
846 if (cflag & CRTSCTS) {
847 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
848 } else {
849 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
850 tty->hw_stopped = 0;
851 }
852
853 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
854 buf[i++] = priv->dp_port_num;
855 buf[i++] = arg;
856 buf[i++] = 0;
857 }
858
859 /* set receive enable/disable */
860 if ((cflag & CREAD) != (old_cflag & CREAD)) {
861 if (cflag & CREAD)
862 arg = DIGI_ENABLE;
863 else
864 arg = DIGI_DISABLE;
865
866 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
867 buf[i++] = priv->dp_port_num;
868 buf[i++] = arg;
869 buf[i++] = 0;
870 }
871 ret = digi_write_oob_command(port, buf, i, 1);
872 if (ret != 0)
873 dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret);
874 tty_encode_baud_rate(tty, baud, baud);
875 }
876
877
878 static void digi_break_ctl(struct tty_struct *tty, int break_state)
879 {
880 struct usb_serial_port *port = tty->driver_data;
881 unsigned char buf[4];
882
883 buf[0] = DIGI_CMD_BREAK_CONTROL;
884 buf[1] = 2; /* length */
885 buf[2] = break_state ? 1 : 0;
886 buf[3] = 0; /* pad */
887 digi_write_inb_command(port, buf, 4, 0);
888 }
889
890
891 static int digi_tiocmget(struct tty_struct *tty)
892 {
893 struct usb_serial_port *port = tty->driver_data;
894 struct digi_port *priv = usb_get_serial_port_data(port);
895 unsigned int val;
896 unsigned long flags;
897
898 spin_lock_irqsave(&priv->dp_port_lock, flags);
899 val = priv->dp_modem_signals;
900 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
901 return val;
902 }
903
904
905 static int digi_tiocmset(struct tty_struct *tty,
906 unsigned int set, unsigned int clear)
907 {
908 struct usb_serial_port *port = tty->driver_data;
909 struct digi_port *priv = usb_get_serial_port_data(port);
910 unsigned int val;
911 unsigned long flags;
912
913 spin_lock_irqsave(&priv->dp_port_lock, flags);
914 val = (priv->dp_modem_signals & ~clear) | set;
915 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
916 return digi_set_modem_signals(port, val, 1);
917 }
918
919
920 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
921 const unsigned char *buf, int count)
922 {
923
924 int ret, data_len, new_len;
925 struct digi_port *priv = usb_get_serial_port_data(port);
926 unsigned char *data = port->write_urb->transfer_buffer;
927 unsigned long flags = 0;
928
929 dev_dbg(&port->dev,
930 "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld\n",
931 priv->dp_port_num, count, in_interrupt());
932
933 /* copy user data (which can sleep) before getting spin lock */
934 count = min(count, port->bulk_out_size-2);
935 count = min(64, count);
936
937 /* be sure only one write proceeds at a time */
938 /* there are races on the port private buffer */
939 spin_lock_irqsave(&priv->dp_port_lock, flags);
940
941 /* wait for urb status clear to submit another urb */
942 if (priv->dp_write_urb_in_use) {
943 /* buffer data if count is 1 (probably put_char) if possible */
944 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
945 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
946 new_len = 1;
947 } else {
948 new_len = 0;
949 }
950 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
951 return new_len;
952 }
953
954 /* allow space for any buffered data and for new data, up to */
955 /* transfer buffer size - 2 (for command and length bytes) */
956 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
957 data_len = new_len + priv->dp_out_buf_len;
958
959 if (data_len == 0) {
960 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
961 return 0;
962 }
963
964 port->write_urb->transfer_buffer_length = data_len+2;
965
966 *data++ = DIGI_CMD_SEND_DATA;
967 *data++ = data_len;
968
969 /* copy in buffered data first */
970 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
971 data += priv->dp_out_buf_len;
972
973 /* copy in new data */
974 memcpy(data, buf, new_len);
975
976 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
977 if (ret == 0) {
978 priv->dp_write_urb_in_use = 1;
979 ret = new_len;
980 priv->dp_out_buf_len = 0;
981 }
982
983 /* return length of new data written, or error */
984 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
985 if (ret < 0)
986 dev_err_console(port,
987 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
988 __func__, ret, priv->dp_port_num);
989 dev_dbg(&port->dev, "digi_write: returning %d\n", ret);
990 return ret;
991
992 }
993
994 static void digi_write_bulk_callback(struct urb *urb)
995 {
996
997 struct usb_serial_port *port = urb->context;
998 struct usb_serial *serial;
999 struct digi_port *priv;
1000 struct digi_serial *serial_priv;
1001 int ret = 0;
1002 int status = urb->status;
1003
1004 /* port and serial sanity check */
1005 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
1006 pr_err("%s: port or port->private is NULL, status=%d\n",
1007 __func__, status);
1008 return;
1009 }
1010 serial = port->serial;
1011 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
1012 dev_err(&port->dev,
1013 "%s: serial or serial->private is NULL, status=%d\n",
1014 __func__, status);
1015 return;
1016 }
1017
1018 /* handle oob callback */
1019 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1020 dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n");
1021 spin_lock(&priv->dp_port_lock);
1022 priv->dp_write_urb_in_use = 0;
1023 wake_up_interruptible(&port->write_wait);
1024 spin_unlock(&priv->dp_port_lock);
1025 return;
1026 }
1027
1028 /* try to send any buffered data on this port */
1029 spin_lock(&priv->dp_port_lock);
1030 priv->dp_write_urb_in_use = 0;
1031 if (priv->dp_out_buf_len > 0) {
1032 *((unsigned char *)(port->write_urb->transfer_buffer))
1033 = (unsigned char)DIGI_CMD_SEND_DATA;
1034 *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
1035 = (unsigned char)priv->dp_out_buf_len;
1036 port->write_urb->transfer_buffer_length =
1037 priv->dp_out_buf_len + 2;
1038 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1039 priv->dp_out_buf_len);
1040 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1041 if (ret == 0) {
1042 priv->dp_write_urb_in_use = 1;
1043 priv->dp_out_buf_len = 0;
1044 }
1045 }
1046 /* wake up processes sleeping on writes immediately */
1047 digi_wakeup_write(port);
1048 /* also queue up a wakeup at scheduler time, in case we */
1049 /* lost the race in write_chan(). */
1050 schedule_work(&priv->dp_wakeup_work);
1051
1052 spin_unlock(&priv->dp_port_lock);
1053 if (ret && ret != -EPERM)
1054 dev_err_console(port,
1055 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1056 __func__, ret, priv->dp_port_num);
1057 }
1058
1059 static int digi_write_room(struct tty_struct *tty)
1060 {
1061 struct usb_serial_port *port = tty->driver_data;
1062 struct digi_port *priv = usb_get_serial_port_data(port);
1063 int room;
1064 unsigned long flags = 0;
1065
1066 spin_lock_irqsave(&priv->dp_port_lock, flags);
1067
1068 if (priv->dp_write_urb_in_use)
1069 room = 0;
1070 else
1071 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1072
1073 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1074 dev_dbg(&port->dev, "digi_write_room: port=%d, room=%d\n", priv->dp_port_num, room);
1075 return room;
1076
1077 }
1078
1079 static int digi_chars_in_buffer(struct tty_struct *tty)
1080 {
1081 struct usb_serial_port *port = tty->driver_data;
1082 struct digi_port *priv = usb_get_serial_port_data(port);
1083
1084 if (priv->dp_write_urb_in_use) {
1085 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1086 priv->dp_port_num, port->bulk_out_size - 2);
1087 /* return(port->bulk_out_size - 2); */
1088 return 256;
1089 } else {
1090 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1091 priv->dp_port_num, priv->dp_out_buf_len);
1092 return priv->dp_out_buf_len;
1093 }
1094
1095 }
1096
1097 static void digi_dtr_rts(struct usb_serial_port *port, int on)
1098 {
1099 /* Adjust DTR and RTS */
1100 digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
1101 }
1102
1103 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1104 {
1105 int ret;
1106 unsigned char buf[32];
1107 struct digi_port *priv = usb_get_serial_port_data(port);
1108 struct ktermios not_termios;
1109
1110 /* be sure the device is started up */
1111 if (digi_startup_device(port->serial) != 0)
1112 return -ENXIO;
1113
1114 /* read modem signals automatically whenever they change */
1115 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1116 buf[1] = priv->dp_port_num;
1117 buf[2] = DIGI_ENABLE;
1118 buf[3] = 0;
1119
1120 /* flush fifos */
1121 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1122 buf[5] = priv->dp_port_num;
1123 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1124 buf[7] = 0;
1125
1126 ret = digi_write_oob_command(port, buf, 8, 1);
1127 if (ret != 0)
1128 dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);
1129
1130 /* set termios settings */
1131 if (tty) {
1132 not_termios.c_cflag = ~tty->termios.c_cflag;
1133 not_termios.c_iflag = ~tty->termios.c_iflag;
1134 digi_set_termios(tty, port, &not_termios);
1135 }
1136 return 0;
1137 }
1138
1139
1140 static void digi_close(struct usb_serial_port *port)
1141 {
1142 DEFINE_WAIT(wait);
1143 int ret;
1144 unsigned char buf[32];
1145 struct digi_port *priv = usb_get_serial_port_data(port);
1146
1147 mutex_lock(&port->serial->disc_mutex);
1148 /* if disconnected, just clear flags */
1149 if (port->serial->disconnected)
1150 goto exit;
1151
1152 if (port->serial->dev) {
1153 /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1154 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1155
1156 /* disable input flow control */
1157 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1158 buf[1] = priv->dp_port_num;
1159 buf[2] = DIGI_DISABLE;
1160 buf[3] = 0;
1161
1162 /* disable output flow control */
1163 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1164 buf[5] = priv->dp_port_num;
1165 buf[6] = DIGI_DISABLE;
1166 buf[7] = 0;
1167
1168 /* disable reading modem signals automatically */
1169 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1170 buf[9] = priv->dp_port_num;
1171 buf[10] = DIGI_DISABLE;
1172 buf[11] = 0;
1173
1174 /* disable receive */
1175 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1176 buf[13] = priv->dp_port_num;
1177 buf[14] = DIGI_DISABLE;
1178 buf[15] = 0;
1179
1180 /* flush fifos */
1181 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1182 buf[17] = priv->dp_port_num;
1183 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1184 buf[19] = 0;
1185
1186 ret = digi_write_oob_command(port, buf, 20, 0);
1187 if (ret != 0)
1188 dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n", ret);
1189
1190 /* wait for final commands on oob port to complete */
1191 prepare_to_wait(&priv->dp_flush_wait, &wait,
1192 TASK_INTERRUPTIBLE);
1193 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1194 finish_wait(&priv->dp_flush_wait, &wait);
1195
1196 /* shutdown any outstanding bulk writes */
1197 usb_kill_urb(port->write_urb);
1198 }
1199 exit:
1200 spin_lock_irq(&priv->dp_port_lock);
1201 priv->dp_write_urb_in_use = 0;
1202 wake_up_interruptible(&priv->dp_close_wait);
1203 spin_unlock_irq(&priv->dp_port_lock);
1204 mutex_unlock(&port->serial->disc_mutex);
1205 }
1206
1207
1208 /*
1209 * Digi Startup Device
1210 *
1211 * Starts reads on all ports. Must be called AFTER startup, with
1212 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1213 */
1214
1215 static int digi_startup_device(struct usb_serial *serial)
1216 {
1217 int i, ret = 0;
1218 struct digi_serial *serial_priv = usb_get_serial_data(serial);
1219 struct usb_serial_port *port;
1220
1221 /* be sure this happens exactly once */
1222 spin_lock(&serial_priv->ds_serial_lock);
1223 if (serial_priv->ds_device_started) {
1224 spin_unlock(&serial_priv->ds_serial_lock);
1225 return 0;
1226 }
1227 serial_priv->ds_device_started = 1;
1228 spin_unlock(&serial_priv->ds_serial_lock);
1229
1230 /* start reading from each bulk in endpoint for the device */
1231 /* set USB_DISABLE_SPD flag for write bulk urbs */
1232 for (i = 0; i < serial->type->num_ports + 1; i++) {
1233 port = serial->port[i];
1234 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1235 if (ret != 0) {
1236 dev_err(&port->dev,
1237 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1238 __func__, ret, i);
1239 break;
1240 }
1241 }
1242 return ret;
1243 }
1244
1245 static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
1246 {
1247 struct digi_port *priv;
1248
1249 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1250 if (!priv)
1251 return -ENOMEM;
1252
1253 spin_lock_init(&priv->dp_port_lock);
1254 priv->dp_port_num = port_num;
1255 init_waitqueue_head(&priv->dp_modem_change_wait);
1256 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1257 init_waitqueue_head(&priv->dp_flush_wait);
1258 init_waitqueue_head(&priv->dp_close_wait);
1259 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1260 priv->dp_port = port;
1261
1262 init_waitqueue_head(&port->write_wait);
1263
1264 usb_set_serial_port_data(port, priv);
1265
1266 return 0;
1267 }
1268
1269 static int digi_startup(struct usb_serial *serial)
1270 {
1271 struct digi_serial *serial_priv;
1272 int ret;
1273
1274 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
1275 if (!serial_priv)
1276 return -ENOMEM;
1277
1278 spin_lock_init(&serial_priv->ds_serial_lock);
1279 serial_priv->ds_oob_port_num = serial->type->num_ports;
1280 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1281
1282 ret = digi_port_init(serial_priv->ds_oob_port,
1283 serial_priv->ds_oob_port_num);
1284 if (ret) {
1285 kfree(serial_priv);
1286 return ret;
1287 }
1288
1289 usb_set_serial_data(serial, serial_priv);
1290
1291 return 0;
1292 }
1293
1294
1295 static void digi_disconnect(struct usb_serial *serial)
1296 {
1297 int i;
1298
1299 /* stop reads and writes on all ports */
1300 for (i = 0; i < serial->type->num_ports + 1; i++) {
1301 usb_kill_urb(serial->port[i]->read_urb);
1302 usb_kill_urb(serial->port[i]->write_urb);
1303 }
1304 }
1305
1306
1307 static void digi_release(struct usb_serial *serial)
1308 {
1309 struct digi_serial *serial_priv;
1310 struct digi_port *priv;
1311
1312 serial_priv = usb_get_serial_data(serial);
1313
1314 priv = usb_get_serial_port_data(serial_priv->ds_oob_port);
1315 kfree(priv);
1316
1317 kfree(serial_priv);
1318 }
1319
1320 static int digi_port_probe(struct usb_serial_port *port)
1321 {
1322 unsigned port_num;
1323
1324 port_num = port->number - port->serial->minor;
1325
1326 return digi_port_init(port, port_num);
1327 }
1328
1329 static int digi_port_remove(struct usb_serial_port *port)
1330 {
1331 struct digi_port *priv;
1332
1333 priv = usb_get_serial_port_data(port);
1334 kfree(priv);
1335
1336 return 0;
1337 }
1338
1339 static void digi_read_bulk_callback(struct urb *urb)
1340 {
1341 struct usb_serial_port *port = urb->context;
1342 struct digi_port *priv;
1343 struct digi_serial *serial_priv;
1344 int ret;
1345 int status = urb->status;
1346
1347 /* port sanity check, do not resubmit if port is not valid */
1348 if (port == NULL)
1349 return;
1350 priv = usb_get_serial_port_data(port);
1351 if (priv == NULL) {
1352 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1353 __func__, status);
1354 return;
1355 }
1356 if (port->serial == NULL ||
1357 (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1358 dev_err(&port->dev, "%s: serial is bad or serial->private "
1359 "is NULL, status=%d\n", __func__, status);
1360 return;
1361 }
1362
1363 /* do not resubmit urb if it has any status error */
1364 if (status) {
1365 dev_err(&port->dev,
1366 "%s: nonzero read bulk status: status=%d, port=%d\n",
1367 __func__, status, priv->dp_port_num);
1368 return;
1369 }
1370
1371 /* handle oob or inb callback, do not resubmit if error */
1372 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1373 if (digi_read_oob_callback(urb) != 0)
1374 return;
1375 } else {
1376 if (digi_read_inb_callback(urb) != 0)
1377 return;
1378 }
1379
1380 /* continue read */
1381 ret = usb_submit_urb(urb, GFP_ATOMIC);
1382 if (ret != 0 && ret != -EPERM) {
1383 dev_err(&port->dev,
1384 "%s: failed resubmitting urb, ret=%d, port=%d\n",
1385 __func__, ret, priv->dp_port_num);
1386 }
1387
1388 }
1389
1390 /*
1391 * Digi Read INB Callback
1392 *
1393 * Digi Read INB Callback handles reads on the in band ports, sending
1394 * the data on to the tty subsystem. When called we know port and
1395 * port->private are not NULL and port->serial has been validated.
1396 * It returns 0 if successful, 1 if successful but the port is
1397 * throttled, and -1 if the sanity checks failed.
1398 */
1399
1400 static int digi_read_inb_callback(struct urb *urb)
1401 {
1402
1403 struct usb_serial_port *port = urb->context;
1404 struct tty_struct *tty;
1405 struct digi_port *priv = usb_get_serial_port_data(port);
1406 int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1407 int len = ((unsigned char *)urb->transfer_buffer)[1];
1408 int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1409 unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3;
1410 int flag, throttled;
1411 int status = urb->status;
1412
1413 /* do not process callbacks on closed ports */
1414 /* but do continue the read chain */
1415 if (urb->status == -ENOENT)
1416 return 0;
1417
1418 /* short/multiple packet check */
1419 if (urb->actual_length != len + 2) {
1420 dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, "
1421 "status=%d, port=%d, opcode=%d, len=%d, "
1422 "actual_length=%d, status=%d\n", __func__, status,
1423 priv->dp_port_num, opcode, len, urb->actual_length,
1424 port_status);
1425 return -1;
1426 }
1427
1428 tty = tty_port_tty_get(&port->port);
1429 spin_lock(&priv->dp_port_lock);
1430
1431 /* check for throttle; if set, do not resubmit read urb */
1432 /* indicate the read chain needs to be restarted on unthrottle */
1433 throttled = priv->dp_throttled;
1434 if (throttled)
1435 priv->dp_throttle_restart = 1;
1436
1437 /* receive data */
1438 if (tty && opcode == DIGI_CMD_RECEIVE_DATA) {
1439 /* get flag from port_status */
1440 flag = 0;
1441
1442 /* overrun is special, not associated with a char */
1443 if (port_status & DIGI_OVERRUN_ERROR)
1444 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1445
1446 /* break takes precedence over parity, */
1447 /* which takes precedence over framing errors */
1448 if (port_status & DIGI_BREAK_ERROR)
1449 flag = TTY_BREAK;
1450 else if (port_status & DIGI_PARITY_ERROR)
1451 flag = TTY_PARITY;
1452 else if (port_status & DIGI_FRAMING_ERROR)
1453 flag = TTY_FRAME;
1454
1455 /* data length is len-1 (one byte of len is port_status) */
1456 --len;
1457 if (len > 0) {
1458 tty_insert_flip_string_fixed_flag(&port->port, data,
1459 flag, len);
1460 tty_flip_buffer_push(tty);
1461 }
1462 }
1463 spin_unlock(&priv->dp_port_lock);
1464 tty_kref_put(tty);
1465
1466 if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1467 dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__);
1468 else if (opcode != DIGI_CMD_RECEIVE_DATA)
1469 dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode);
1470
1471 return throttled ? 1 : 0;
1472
1473 }
1474
1475
1476 /*
1477 * Digi Read OOB Callback
1478 *
1479 * Digi Read OOB Callback handles reads on the out of band port.
1480 * When called we know port and port->private are not NULL and
1481 * the port->serial is valid. It returns 0 if successful, and
1482 * -1 if the sanity checks failed.
1483 */
1484
1485 static int digi_read_oob_callback(struct urb *urb)
1486 {
1487
1488 struct usb_serial_port *port = urb->context;
1489 struct usb_serial *serial = port->serial;
1490 struct tty_struct *tty;
1491 struct digi_port *priv = usb_get_serial_port_data(port);
1492 int opcode, line, status, val;
1493 int i;
1494 unsigned int rts;
1495
1496 /* handle each oob command */
1497 for (i = 0; i < urb->actual_length - 3;) {
1498 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1499 line = ((unsigned char *)urb->transfer_buffer)[i++];
1500 status = ((unsigned char *)urb->transfer_buffer)[i++];
1501 val = ((unsigned char *)urb->transfer_buffer)[i++];
1502
1503 dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",
1504 opcode, line, status, val);
1505
1506 if (status != 0 || line >= serial->type->num_ports)
1507 continue;
1508
1509 port = serial->port[line];
1510
1511 priv = usb_get_serial_port_data(port);
1512 if (priv == NULL)
1513 return -1;
1514
1515 tty = tty_port_tty_get(&port->port);
1516
1517 rts = 0;
1518 if (tty)
1519 rts = tty->termios.c_cflag & CRTSCTS;
1520
1521 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1522 spin_lock(&priv->dp_port_lock);
1523 /* convert from digi flags to termiox flags */
1524 if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1525 priv->dp_modem_signals |= TIOCM_CTS;
1526 /* port must be open to use tty struct */
1527 if (rts) {
1528 tty->hw_stopped = 0;
1529 digi_wakeup_write(port);
1530 }
1531 } else {
1532 priv->dp_modem_signals &= ~TIOCM_CTS;
1533 /* port must be open to use tty struct */
1534 if (rts)
1535 tty->hw_stopped = 1;
1536 }
1537 if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1538 priv->dp_modem_signals |= TIOCM_DSR;
1539 else
1540 priv->dp_modem_signals &= ~TIOCM_DSR;
1541 if (val & DIGI_READ_INPUT_SIGNALS_RI)
1542 priv->dp_modem_signals |= TIOCM_RI;
1543 else
1544 priv->dp_modem_signals &= ~TIOCM_RI;
1545 if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1546 priv->dp_modem_signals |= TIOCM_CD;
1547 else
1548 priv->dp_modem_signals &= ~TIOCM_CD;
1549
1550 wake_up_interruptible(&priv->dp_modem_change_wait);
1551 spin_unlock(&priv->dp_port_lock);
1552 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1553 spin_lock(&priv->dp_port_lock);
1554 priv->dp_transmit_idle = 1;
1555 wake_up_interruptible(&priv->dp_transmit_idle_wait);
1556 spin_unlock(&priv->dp_port_lock);
1557 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1558 wake_up_interruptible(&priv->dp_flush_wait);
1559 }
1560 tty_kref_put(tty);
1561 }
1562 return 0;
1563
1564 }
1565
1566 module_usb_serial_driver(serial_drivers, id_table_combined);
1567
1568 MODULE_AUTHOR(DRIVER_AUTHOR);
1569 MODULE_DESCRIPTION(DRIVER_DESC);
1570 MODULE_LICENSE("GPL");
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