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Merge tag 'regmap-fix-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / drivers / usb / serial / digi_acceleport.c
blob0ecd5316d85fe04e0815e834da51904f239ec943
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Digi AccelePort USB-4 and USB-2 Serial Converters
4 *
5 * Copyright 2000 by Digi International
6 *
7 * Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
8 * usb-serial driver.
9 *
10 * Peter Berger (pberger@brimson.com)
11 * Al Borchers (borchers@steinerpoint.com)
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/tty.h>
18 #include <linux/tty_driver.h>
19 #include <linux/tty_flip.h>
20 #include <linux/module.h>
21 #include <linux/spinlock.h>
22 #include <linux/uaccess.h>
23 #include <linux/usb.h>
24 #include <linux/wait.h>
25 #include <linux/sched/signal.h>
26 #include <linux/usb/serial.h>
27
28 /* Defines */
29
30 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
31 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
32
33 /* port output buffer length -- must be <= transfer buffer length - 2 */
34 /* so we can be sure to send the full buffer in one urb */
35 #define DIGI_OUT_BUF_SIZE 8
36
37 /* port input buffer length -- must be >= transfer buffer length - 3 */
38 /* so we can be sure to hold at least one full buffer from one urb */
39 #define DIGI_IN_BUF_SIZE 64
40
41 /* retry timeout while sleeping */
42 #define DIGI_RETRY_TIMEOUT (HZ/10)
43
44 /* timeout while waiting for tty output to drain in close */
45 /* this delay is used twice in close, so the total delay could */
46 /* be twice this value */
47 #define DIGI_CLOSE_TIMEOUT (5*HZ)
48
49
50 /* AccelePort USB Defines */
51
52 /* ids */
53 #define DIGI_VENDOR_ID 0x05c5
54 #define DIGI_2_ID 0x0002 /* USB-2 */
55 #define DIGI_4_ID 0x0004 /* USB-4 */
56
57 /* commands
58 * "INB": can be used on the in-band endpoint
59 * "OOB": can be used on the out-of-band endpoint
60 */
61 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
62 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
63 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
64 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
65 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
66 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
67 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
68 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
69 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
70 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
71 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
72 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
73 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
74 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
75 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
76 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
77 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
78 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
79 #define DIGI_CMD_SEND_DATA 18 /* INB */
80 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */
81 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
82 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
83
84 /* baud rates */
85 #define DIGI_BAUD_50 0
86 #define DIGI_BAUD_75 1
87 #define DIGI_BAUD_110 2
88 #define DIGI_BAUD_150 3
89 #define DIGI_BAUD_200 4
90 #define DIGI_BAUD_300 5
91 #define DIGI_BAUD_600 6
92 #define DIGI_BAUD_1200 7
93 #define DIGI_BAUD_1800 8
94 #define DIGI_BAUD_2400 9
95 #define DIGI_BAUD_4800 10
96 #define DIGI_BAUD_7200 11
97 #define DIGI_BAUD_9600 12
98 #define DIGI_BAUD_14400 13
99 #define DIGI_BAUD_19200 14
100 #define DIGI_BAUD_28800 15
101 #define DIGI_BAUD_38400 16
102 #define DIGI_BAUD_57600 17
103 #define DIGI_BAUD_76800 18
104 #define DIGI_BAUD_115200 19
105 #define DIGI_BAUD_153600 20
106 #define DIGI_BAUD_230400 21
107 #define DIGI_BAUD_460800 22
108
109 /* arguments */
110 #define DIGI_WORD_SIZE_5 0
111 #define DIGI_WORD_SIZE_6 1
112 #define DIGI_WORD_SIZE_7 2
113 #define DIGI_WORD_SIZE_8 3
114
115 #define DIGI_PARITY_NONE 0
116 #define DIGI_PARITY_ODD 1
117 #define DIGI_PARITY_EVEN 2
118 #define DIGI_PARITY_MARK 3
119 #define DIGI_PARITY_SPACE 4
120
121 #define DIGI_STOP_BITS_1 0
122 #define DIGI_STOP_BITS_2 1
123
124 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
125 #define DIGI_INPUT_FLOW_CONTROL_RTS 2
126 #define DIGI_INPUT_FLOW_CONTROL_DTR 4
127
128 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
129 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
130 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
131
132 #define DIGI_DTR_INACTIVE 0
133 #define DIGI_DTR_ACTIVE 1
134 #define DIGI_DTR_INPUT_FLOW_CONTROL 2
135
136 #define DIGI_RTS_INACTIVE 0
137 #define DIGI_RTS_ACTIVE 1
138 #define DIGI_RTS_INPUT_FLOW_CONTROL 2
139 #define DIGI_RTS_TOGGLE 3
140
141 #define DIGI_FLUSH_TX 1
142 #define DIGI_FLUSH_RX 2
143 #define DIGI_RESUME_TX 4 /* clears xoff condition */
144
145 #define DIGI_TRANSMIT_NOT_IDLE 0
146 #define DIGI_TRANSMIT_IDLE 1
147
148 #define DIGI_DISABLE 0
149 #define DIGI_ENABLE 1
150
151 #define DIGI_DEASSERT 0
152 #define DIGI_ASSERT 1
153
154 /* in band status codes */
155 #define DIGI_OVERRUN_ERROR 4
156 #define DIGI_PARITY_ERROR 8
157 #define DIGI_FRAMING_ERROR 16
158 #define DIGI_BREAK_ERROR 32
159
160 /* out of band status */
161 #define DIGI_NO_ERROR 0
162 #define DIGI_BAD_FIRST_PARAMETER 1
163 #define DIGI_BAD_SECOND_PARAMETER 2
164 #define DIGI_INVALID_LINE 3
165 #define DIGI_INVALID_OPCODE 4
166
167 /* input signals */
168 #define DIGI_READ_INPUT_SIGNALS_SLOT 1
169 #define DIGI_READ_INPUT_SIGNALS_ERR 2
170 #define DIGI_READ_INPUT_SIGNALS_BUSY 4
171 #define DIGI_READ_INPUT_SIGNALS_PE 8
172 #define DIGI_READ_INPUT_SIGNALS_CTS 16
173 #define DIGI_READ_INPUT_SIGNALS_DSR 32
174 #define DIGI_READ_INPUT_SIGNALS_RI 64
175 #define DIGI_READ_INPUT_SIGNALS_DCD 128
176
177
178 /* Structures */
179
180 struct digi_serial {
181 spinlock_t ds_serial_lock;
182 struct usb_serial_port *ds_oob_port; /* out-of-band port */
183 int ds_oob_port_num; /* index of out-of-band port */
184 int ds_device_started;
185 };
186
187 struct digi_port {
188 spinlock_t dp_port_lock;
189 int dp_port_num;
190 int dp_out_buf_len;
191 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
192 int dp_write_urb_in_use;
193 unsigned int dp_modem_signals;
194 int dp_transmit_idle;
195 wait_queue_head_t dp_transmit_idle_wait;
196 int dp_throttled;
197 int dp_throttle_restart;
198 wait_queue_head_t dp_flush_wait;
199 wait_queue_head_t dp_close_wait; /* wait queue for close */
200 wait_queue_head_t write_wait;
201 struct usb_serial_port *dp_port;
202 };
203
204
205 /* Local Function Declarations */
206
207 static int digi_write_oob_command(struct usb_serial_port *port,
208 unsigned char *buf, int count, int interruptible);
209 static int digi_write_inb_command(struct usb_serial_port *port,
210 unsigned char *buf, int count, unsigned long timeout);
211 static int digi_set_modem_signals(struct usb_serial_port *port,
212 unsigned int modem_signals, int interruptible);
213 static int digi_transmit_idle(struct usb_serial_port *port,
214 unsigned long timeout);
215 static void digi_rx_throttle(struct tty_struct *tty);
216 static void digi_rx_unthrottle(struct tty_struct *tty);
217 static void digi_set_termios(struct tty_struct *tty,
218 struct usb_serial_port *port, struct ktermios *old_termios);
219 static void digi_break_ctl(struct tty_struct *tty, int break_state);
220 static int digi_tiocmget(struct tty_struct *tty);
221 static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
222 unsigned int clear);
223 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
224 const unsigned char *buf, int count);
225 static void digi_write_bulk_callback(struct urb *urb);
226 static int digi_write_room(struct tty_struct *tty);
227 static int digi_chars_in_buffer(struct tty_struct *tty);
228 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
229 static void digi_close(struct usb_serial_port *port);
230 static void digi_dtr_rts(struct usb_serial_port *port, int on);
231 static int digi_startup_device(struct usb_serial *serial);
232 static int digi_startup(struct usb_serial *serial);
233 static void digi_disconnect(struct usb_serial *serial);
234 static void digi_release(struct usb_serial *serial);
235 static int digi_port_probe(struct usb_serial_port *port);
236 static int digi_port_remove(struct usb_serial_port *port);
237 static void digi_read_bulk_callback(struct urb *urb);
238 static int digi_read_inb_callback(struct urb *urb);
239 static int digi_read_oob_callback(struct urb *urb);
240
241
242 static const struct usb_device_id id_table_combined[] = {
243 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
244 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
245 { } /* Terminating entry */
246 };
247
248 static const struct usb_device_id id_table_2[] = {
249 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
250 { } /* Terminating entry */
251 };
252
253 static const struct usb_device_id id_table_4[] = {
254 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
255 { } /* Terminating entry */
256 };
257
258 MODULE_DEVICE_TABLE(usb, id_table_combined);
259
260 /* device info needed for the Digi serial converter */
261
262 static struct usb_serial_driver digi_acceleport_2_device = {
263 .driver = {
264 .owner = THIS_MODULE,
265 .name = "digi_2",
266 },
267 .description = "Digi 2 port USB adapter",
268 .id_table = id_table_2,
269 .num_ports = 3,
270 .num_bulk_in = 4,
271 .num_bulk_out = 4,
272 .open = digi_open,
273 .close = digi_close,
274 .dtr_rts = digi_dtr_rts,
275 .write = digi_write,
276 .write_room = digi_write_room,
277 .write_bulk_callback = digi_write_bulk_callback,
278 .read_bulk_callback = digi_read_bulk_callback,
279 .chars_in_buffer = digi_chars_in_buffer,
280 .throttle = digi_rx_throttle,
281 .unthrottle = digi_rx_unthrottle,
282 .set_termios = digi_set_termios,
283 .break_ctl = digi_break_ctl,
284 .tiocmget = digi_tiocmget,
285 .tiocmset = digi_tiocmset,
286 .attach = digi_startup,
287 .disconnect = digi_disconnect,
288 .release = digi_release,
289 .port_probe = digi_port_probe,
290 .port_remove = digi_port_remove,
291 };
292
293 static struct usb_serial_driver digi_acceleport_4_device = {
294 .driver = {
295 .owner = THIS_MODULE,
296 .name = "digi_4",
297 },
298 .description = "Digi 4 port USB adapter",
299 .id_table = id_table_4,
300 .num_ports = 4,
301 .num_bulk_in = 5,
302 .num_bulk_out = 5,
303 .open = digi_open,
304 .close = digi_close,
305 .write = digi_write,
306 .write_room = digi_write_room,
307 .write_bulk_callback = digi_write_bulk_callback,
308 .read_bulk_callback = digi_read_bulk_callback,
309 .chars_in_buffer = digi_chars_in_buffer,
310 .throttle = digi_rx_throttle,
311 .unthrottle = digi_rx_unthrottle,
312 .set_termios = digi_set_termios,
313 .break_ctl = digi_break_ctl,
314 .tiocmget = digi_tiocmget,
315 .tiocmset = digi_tiocmset,
316 .attach = digi_startup,
317 .disconnect = digi_disconnect,
318 .release = digi_release,
319 .port_probe = digi_port_probe,
320 .port_remove = digi_port_remove,
321 };
322
323 static struct usb_serial_driver * const serial_drivers[] = {
324 &digi_acceleport_2_device, &digi_acceleport_4_device, NULL
325 };
326
327 /* Functions */
328
329 /*
330 * Cond Wait Interruptible Timeout Irqrestore
331 *
332 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
333 * so that wake ups are not lost if they occur between the unlock
334 * and the sleep. In other words, spin_unlock_irqrestore and
335 * interruptible_sleep_on_timeout are "atomic" with respect to
336 * wake ups. This is used to implement condition variables.
337 *
338 * interruptible_sleep_on_timeout is deprecated and has been replaced
339 * with the equivalent code.
340 */
341
342 static long cond_wait_interruptible_timeout_irqrestore(
343 wait_queue_head_t *q, long timeout,
344 spinlock_t *lock, unsigned long flags)
345 __releases(lock)
346 {
347 DEFINE_WAIT(wait);
348
349 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
350 spin_unlock_irqrestore(lock, flags);
351 timeout = schedule_timeout(timeout);
352 finish_wait(q, &wait);
353
354 return timeout;
355 }
356
357 /*
358 * Digi Write OOB Command
359 *
360 * Write commands on the out of band port. Commands are 4
361 * bytes each, multiple commands can be sent at once, and
362 * no command will be split across USB packets. Returns 0
363 * if successful, -EINTR if interrupted while sleeping and
364 * the interruptible flag is true, or a negative error
365 * returned by usb_submit_urb.
366 */
367
368 static int digi_write_oob_command(struct usb_serial_port *port,
369 unsigned char *buf, int count, int interruptible)
370 {
371 int ret = 0;
372 int len;
373 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
374 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
375 unsigned long flags = 0;
376
377 dev_dbg(&port->dev,
378 "digi_write_oob_command: TOP: port=%d, count=%d\n",
379 oob_priv->dp_port_num, count);
380
381 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
382 while (count > 0) {
383 while (oob_priv->dp_write_urb_in_use) {
384 cond_wait_interruptible_timeout_irqrestore(
385 &oob_priv->write_wait, DIGI_RETRY_TIMEOUT,
386 &oob_priv->dp_port_lock, flags);
387 if (interruptible && signal_pending(current))
388 return -EINTR;
389 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
390 }
391
392 /* len must be a multiple of 4, so commands are not split */
393 len = min(count, oob_port->bulk_out_size);
394 if (len > 4)
395 len &= ~3;
396 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
397 oob_port->write_urb->transfer_buffer_length = len;
398 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
399 if (ret == 0) {
400 oob_priv->dp_write_urb_in_use = 1;
401 count -= len;
402 buf += len;
403 }
404 }
405 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
406 if (ret)
407 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
408 __func__, ret);
409 return ret;
410
411 }
412
413
414 /*
415 * Digi Write In Band Command
416 *
417 * Write commands on the given port. Commands are 4
418 * bytes each, multiple commands can be sent at once, and
419 * no command will be split across USB packets. If timeout
420 * is non-zero, write in band command will return after
421 * waiting unsuccessfully for the URB status to clear for
422 * timeout ticks. Returns 0 if successful, or a negative
423 * error returned by digi_write.
424 */
425
426 static int digi_write_inb_command(struct usb_serial_port *port,
427 unsigned char *buf, int count, unsigned long timeout)
428 {
429 int ret = 0;
430 int len;
431 struct digi_port *priv = usb_get_serial_port_data(port);
432 unsigned char *data = port->write_urb->transfer_buffer;
433 unsigned long flags = 0;
434
435 dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",
436 priv->dp_port_num, count);
437
438 if (timeout)
439 timeout += jiffies;
440 else
441 timeout = ULONG_MAX;
442
443 spin_lock_irqsave(&priv->dp_port_lock, flags);
444 while (count > 0 && ret == 0) {
445 while (priv->dp_write_urb_in_use &&
446 time_before(jiffies, timeout)) {
447 cond_wait_interruptible_timeout_irqrestore(
448 &priv->write_wait, DIGI_RETRY_TIMEOUT,
449 &priv->dp_port_lock, flags);
450 if (signal_pending(current))
451 return -EINTR;
452 spin_lock_irqsave(&priv->dp_port_lock, flags);
453 }
454
455 /* len must be a multiple of 4 and small enough to */
456 /* guarantee the write will send buffered data first, */
457 /* so commands are in order with data and not split */
458 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
459 if (len > 4)
460 len &= ~3;
461
462 /* write any buffered data first */
463 if (priv->dp_out_buf_len > 0) {
464 data[0] = DIGI_CMD_SEND_DATA;
465 data[1] = priv->dp_out_buf_len;
466 memcpy(data + 2, priv->dp_out_buf,
467 priv->dp_out_buf_len);
468 memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
469 port->write_urb->transfer_buffer_length
470 = priv->dp_out_buf_len + 2 + len;
471 } else {
472 memcpy(data, buf, len);
473 port->write_urb->transfer_buffer_length = len;
474 }
475
476 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
477 if (ret == 0) {
478 priv->dp_write_urb_in_use = 1;
479 priv->dp_out_buf_len = 0;
480 count -= len;
481 buf += len;
482 }
483
484 }
485 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
486
487 if (ret)
488 dev_err(&port->dev,
489 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
490 __func__, ret, priv->dp_port_num);
491 return ret;
492 }
493
494
495 /*
496 * Digi Set Modem Signals
497 *
498 * Sets or clears DTR and RTS on the port, according to the
499 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
500 * for the modem_signals argument. Returns 0 if successful,
501 * -EINTR if interrupted while sleeping, or a non-zero error
502 * returned by usb_submit_urb.
503 */
504
505 static int digi_set_modem_signals(struct usb_serial_port *port,
506 unsigned int modem_signals, int interruptible)
507 {
508
509 int ret;
510 struct digi_port *port_priv = usb_get_serial_port_data(port);
511 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
512 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
513 unsigned char *data = oob_port->write_urb->transfer_buffer;
514 unsigned long flags = 0;
515
516
517 dev_dbg(&port->dev,
518 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n",
519 port_priv->dp_port_num, modem_signals);
520
521 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
522 spin_lock(&port_priv->dp_port_lock);
523
524 while (oob_priv->dp_write_urb_in_use) {
525 spin_unlock(&port_priv->dp_port_lock);
526 cond_wait_interruptible_timeout_irqrestore(
527 &oob_priv->write_wait, DIGI_RETRY_TIMEOUT,
528 &oob_priv->dp_port_lock, flags);
529 if (interruptible && signal_pending(current))
530 return -EINTR;
531 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
532 spin_lock(&port_priv->dp_port_lock);
533 }
534 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
535 data[1] = port_priv->dp_port_num;
536 data[2] = (modem_signals & TIOCM_DTR) ?
537 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
538 data[3] = 0;
539 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
540 data[5] = port_priv->dp_port_num;
541 data[6] = (modem_signals & TIOCM_RTS) ?
542 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
543 data[7] = 0;
544
545 oob_port->write_urb->transfer_buffer_length = 8;
546
547 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
548 if (ret == 0) {
549 oob_priv->dp_write_urb_in_use = 1;
550 port_priv->dp_modem_signals &= ~(TIOCM_DTR | TIOCM_RTS);
551 port_priv->dp_modem_signals |=
552 modem_signals & (TIOCM_DTR | TIOCM_RTS);
553 }
554 spin_unlock(&port_priv->dp_port_lock);
555 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
556 if (ret)
557 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
558 __func__, ret);
559 return ret;
560 }
561
562 /*
563 * Digi Transmit Idle
564 *
565 * Digi transmit idle waits, up to timeout ticks, for the transmitter
566 * to go idle. It returns 0 if successful or a negative error.
567 *
568 * There are race conditions here if more than one process is calling
569 * digi_transmit_idle on the same port at the same time. However, this
570 * is only called from close, and only one process can be in close on a
571 * port at a time, so its ok.
572 */
573
574 static int digi_transmit_idle(struct usb_serial_port *port,
575 unsigned long timeout)
576 {
577 int ret;
578 unsigned char buf[2];
579 struct digi_port *priv = usb_get_serial_port_data(port);
580 unsigned long flags = 0;
581
582 spin_lock_irqsave(&priv->dp_port_lock, flags);
583 priv->dp_transmit_idle = 0;
584 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
585
586 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
587 buf[1] = 0;
588
589 timeout += jiffies;
590
591 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
592 if (ret != 0)
593 return ret;
594
595 spin_lock_irqsave(&priv->dp_port_lock, flags);
596
597 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
598 cond_wait_interruptible_timeout_irqrestore(
599 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
600 &priv->dp_port_lock, flags);
601 if (signal_pending(current))
602 return -EINTR;
603 spin_lock_irqsave(&priv->dp_port_lock, flags);
604 }
605 priv->dp_transmit_idle = 0;
606 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
607 return 0;
608
609 }
610
611
612 static void digi_rx_throttle(struct tty_struct *tty)
613 {
614 unsigned long flags;
615 struct usb_serial_port *port = tty->driver_data;
616 struct digi_port *priv = usb_get_serial_port_data(port);
617
618 /* stop receiving characters by not resubmitting the read urb */
619 spin_lock_irqsave(&priv->dp_port_lock, flags);
620 priv->dp_throttled = 1;
621 priv->dp_throttle_restart = 0;
622 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
623 }
624
625
626 static void digi_rx_unthrottle(struct tty_struct *tty)
627 {
628 int ret = 0;
629 unsigned long flags;
630 struct usb_serial_port *port = tty->driver_data;
631 struct digi_port *priv = usb_get_serial_port_data(port);
632
633 spin_lock_irqsave(&priv->dp_port_lock, flags);
634
635 /* restart read chain */
636 if (priv->dp_throttle_restart)
637 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
638
639 /* turn throttle off */
640 priv->dp_throttled = 0;
641 priv->dp_throttle_restart = 0;
642
643 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
644
645 if (ret)
646 dev_err(&port->dev,
647 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
648 __func__, ret, priv->dp_port_num);
649 }
650
651
652 static void digi_set_termios(struct tty_struct *tty,
653 struct usb_serial_port *port, struct ktermios *old_termios)
654 {
655 struct digi_port *priv = usb_get_serial_port_data(port);
656 struct device *dev = &port->dev;
657 unsigned int iflag = tty->termios.c_iflag;
658 unsigned int cflag = tty->termios.c_cflag;
659 unsigned int old_iflag = old_termios->c_iflag;
660 unsigned int old_cflag = old_termios->c_cflag;
661 unsigned char buf[32];
662 unsigned int modem_signals;
663 int arg, ret;
664 int i = 0;
665 speed_t baud;
666
667 dev_dbg(dev,
668 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n",
669 priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
670
671 /* set baud rate */
672 baud = tty_get_baud_rate(tty);
673 if (baud != tty_termios_baud_rate(old_termios)) {
674 arg = -1;
675
676 /* reassert DTR and (maybe) RTS on transition from B0 */
677 if ((old_cflag & CBAUD) == B0) {
678 /* don't set RTS if using hardware flow control */
679 /* and throttling input */
680 modem_signals = TIOCM_DTR;
681 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
682 modem_signals |= TIOCM_RTS;
683 digi_set_modem_signals(port, modem_signals, 1);
684 }
685 switch (baud) {
686 /* drop DTR and RTS on transition to B0 */
687 case 0: digi_set_modem_signals(port, 0, 1); break;
688 case 50: arg = DIGI_BAUD_50; break;
689 case 75: arg = DIGI_BAUD_75; break;
690 case 110: arg = DIGI_BAUD_110; break;
691 case 150: arg = DIGI_BAUD_150; break;
692 case 200: arg = DIGI_BAUD_200; break;
693 case 300: arg = DIGI_BAUD_300; break;
694 case 600: arg = DIGI_BAUD_600; break;
695 case 1200: arg = DIGI_BAUD_1200; break;
696 case 1800: arg = DIGI_BAUD_1800; break;
697 case 2400: arg = DIGI_BAUD_2400; break;
698 case 4800: arg = DIGI_BAUD_4800; break;
699 case 9600: arg = DIGI_BAUD_9600; break;
700 case 19200: arg = DIGI_BAUD_19200; break;
701 case 38400: arg = DIGI_BAUD_38400; break;
702 case 57600: arg = DIGI_BAUD_57600; break;
703 case 115200: arg = DIGI_BAUD_115200; break;
704 case 230400: arg = DIGI_BAUD_230400; break;
705 case 460800: arg = DIGI_BAUD_460800; break;
706 default:
707 arg = DIGI_BAUD_9600;
708 baud = 9600;
709 break;
710 }
711 if (arg != -1) {
712 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
713 buf[i++] = priv->dp_port_num;
714 buf[i++] = arg;
715 buf[i++] = 0;
716 }
717 }
718 /* set parity */
719 tty->termios.c_cflag &= ~CMSPAR;
720
721 if ((cflag & (PARENB | PARODD)) != (old_cflag & (PARENB | PARODD))) {
722 if (cflag & PARENB) {
723 if (cflag & PARODD)
724 arg = DIGI_PARITY_ODD;
725 else
726 arg = DIGI_PARITY_EVEN;
727 } else {
728 arg = DIGI_PARITY_NONE;
729 }
730 buf[i++] = DIGI_CMD_SET_PARITY;
731 buf[i++] = priv->dp_port_num;
732 buf[i++] = arg;
733 buf[i++] = 0;
734 }
735 /* set word size */
736 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
737 arg = -1;
738 switch (cflag & CSIZE) {
739 case CS5: arg = DIGI_WORD_SIZE_5; break;
740 case CS6: arg = DIGI_WORD_SIZE_6; break;
741 case CS7: arg = DIGI_WORD_SIZE_7; break;
742 case CS8: arg = DIGI_WORD_SIZE_8; break;
743 default:
744 dev_dbg(dev,
745 "digi_set_termios: can't handle word size %d\n",
746 cflag & CSIZE);
747 break;
748 }
749
750 if (arg != -1) {
751 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
752 buf[i++] = priv->dp_port_num;
753 buf[i++] = arg;
754 buf[i++] = 0;
755 }
756
757 }
758
759 /* set stop bits */
760 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
761
762 if ((cflag & CSTOPB))
763 arg = DIGI_STOP_BITS_2;
764 else
765 arg = DIGI_STOP_BITS_1;
766
767 buf[i++] = DIGI_CMD_SET_STOP_BITS;
768 buf[i++] = priv->dp_port_num;
769 buf[i++] = arg;
770 buf[i++] = 0;
771
772 }
773
774 /* set input flow control */
775 if ((iflag & IXOFF) != (old_iflag & IXOFF) ||
776 (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
777 arg = 0;
778 if (iflag & IXOFF)
779 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
780 else
781 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
782
783 if (cflag & CRTSCTS) {
784 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
785
786 /* On USB-4 it is necessary to assert RTS prior */
787 /* to selecting RTS input flow control. */
788 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
789 buf[i++] = priv->dp_port_num;
790 buf[i++] = DIGI_RTS_ACTIVE;
791 buf[i++] = 0;
792
793 } else {
794 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
795 }
796 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
797 buf[i++] = priv->dp_port_num;
798 buf[i++] = arg;
799 buf[i++] = 0;
800 }
801
802 /* set output flow control */
803 if ((iflag & IXON) != (old_iflag & IXON) ||
804 (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
805 arg = 0;
806 if (iflag & IXON)
807 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
808 else
809 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
810
811 if (cflag & CRTSCTS)
812 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
813 else
814 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
815
816 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
817 buf[i++] = priv->dp_port_num;
818 buf[i++] = arg;
819 buf[i++] = 0;
820 }
821
822 /* set receive enable/disable */
823 if ((cflag & CREAD) != (old_cflag & CREAD)) {
824 if (cflag & CREAD)
825 arg = DIGI_ENABLE;
826 else
827 arg = DIGI_DISABLE;
828
829 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
830 buf[i++] = priv->dp_port_num;
831 buf[i++] = arg;
832 buf[i++] = 0;
833 }
834 ret = digi_write_oob_command(port, buf, i, 1);
835 if (ret != 0)
836 dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret);
837 tty_encode_baud_rate(tty, baud, baud);
838 }
839
840
841 static void digi_break_ctl(struct tty_struct *tty, int break_state)
842 {
843 struct usb_serial_port *port = tty->driver_data;
844 unsigned char buf[4];
845
846 buf[0] = DIGI_CMD_BREAK_CONTROL;
847 buf[1] = 2; /* length */
848 buf[2] = break_state ? 1 : 0;
849 buf[3] = 0; /* pad */
850 digi_write_inb_command(port, buf, 4, 0);
851 }
852
853
854 static int digi_tiocmget(struct tty_struct *tty)
855 {
856 struct usb_serial_port *port = tty->driver_data;
857 struct digi_port *priv = usb_get_serial_port_data(port);
858 unsigned int val;
859 unsigned long flags;
860
861 spin_lock_irqsave(&priv->dp_port_lock, flags);
862 val = priv->dp_modem_signals;
863 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
864 return val;
865 }
866
867
868 static int digi_tiocmset(struct tty_struct *tty,
869 unsigned int set, unsigned int clear)
870 {
871 struct usb_serial_port *port = tty->driver_data;
872 struct digi_port *priv = usb_get_serial_port_data(port);
873 unsigned int val;
874 unsigned long flags;
875
876 spin_lock_irqsave(&priv->dp_port_lock, flags);
877 val = (priv->dp_modem_signals & ~clear) | set;
878 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
879 return digi_set_modem_signals(port, val, 1);
880 }
881
882
883 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
884 const unsigned char *buf, int count)
885 {
886
887 int ret, data_len, new_len;
888 struct digi_port *priv = usb_get_serial_port_data(port);
889 unsigned char *data = port->write_urb->transfer_buffer;
890 unsigned long flags = 0;
891
892 dev_dbg(&port->dev, "digi_write: TOP: port=%d, count=%d\n",
893 priv->dp_port_num, count);
894
895 /* copy user data (which can sleep) before getting spin lock */
896 count = min(count, port->bulk_out_size-2);
897 count = min(64, count);
898
899 /* be sure only one write proceeds at a time */
900 /* there are races on the port private buffer */
901 spin_lock_irqsave(&priv->dp_port_lock, flags);
902
903 /* wait for urb status clear to submit another urb */
904 if (priv->dp_write_urb_in_use) {
905 /* buffer data if count is 1 (probably put_char) if possible */
906 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
907 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
908 new_len = 1;
909 } else {
910 new_len = 0;
911 }
912 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
913 return new_len;
914 }
915
916 /* allow space for any buffered data and for new data, up to */
917 /* transfer buffer size - 2 (for command and length bytes) */
918 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
919 data_len = new_len + priv->dp_out_buf_len;
920
921 if (data_len == 0) {
922 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
923 return 0;
924 }
925
926 port->write_urb->transfer_buffer_length = data_len+2;
927
928 *data++ = DIGI_CMD_SEND_DATA;
929 *data++ = data_len;
930
931 /* copy in buffered data first */
932 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
933 data += priv->dp_out_buf_len;
934
935 /* copy in new data */
936 memcpy(data, buf, new_len);
937
938 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
939 if (ret == 0) {
940 priv->dp_write_urb_in_use = 1;
941 ret = new_len;
942 priv->dp_out_buf_len = 0;
943 }
944
945 /* return length of new data written, or error */
946 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
947 if (ret < 0)
948 dev_err_console(port,
949 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
950 __func__, ret, priv->dp_port_num);
951 dev_dbg(&port->dev, "digi_write: returning %d\n", ret);
952 return ret;
953
954 }
955
956 static void digi_write_bulk_callback(struct urb *urb)
957 {
958
959 struct usb_serial_port *port = urb->context;
960 struct usb_serial *serial;
961 struct digi_port *priv;
962 struct digi_serial *serial_priv;
963 unsigned long flags;
964 int ret = 0;
965 int status = urb->status;
966 bool wakeup;
967
968 /* port and serial sanity check */
969 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
970 pr_err("%s: port or port->private is NULL, status=%d\n",
971 __func__, status);
972 return;
973 }
974 serial = port->serial;
975 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
976 dev_err(&port->dev,
977 "%s: serial or serial->private is NULL, status=%d\n",
978 __func__, status);
979 return;
980 }
981
982 /* handle oob callback */
983 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
984 dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n");
985 spin_lock_irqsave(&priv->dp_port_lock, flags);
986 priv->dp_write_urb_in_use = 0;
987 wake_up_interruptible(&priv->write_wait);
988 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
989 return;
990 }
991
992 /* try to send any buffered data on this port */
993 wakeup = true;
994 spin_lock_irqsave(&priv->dp_port_lock, flags);
995 priv->dp_write_urb_in_use = 0;
996 if (priv->dp_out_buf_len > 0) {
997 *((unsigned char *)(port->write_urb->transfer_buffer))
998 = (unsigned char)DIGI_CMD_SEND_DATA;
999 *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
1000 = (unsigned char)priv->dp_out_buf_len;
1001 port->write_urb->transfer_buffer_length =
1002 priv->dp_out_buf_len + 2;
1003 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1004 priv->dp_out_buf_len);
1005 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1006 if (ret == 0) {
1007 priv->dp_write_urb_in_use = 1;
1008 priv->dp_out_buf_len = 0;
1009 wakeup = false;
1010 }
1011 }
1012 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1013
1014 if (ret && ret != -EPERM)
1015 dev_err_console(port,
1016 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1017 __func__, ret, priv->dp_port_num);
1018
1019 if (wakeup)
1020 tty_port_tty_wakeup(&port->port);
1021 }
1022
1023 static int digi_write_room(struct tty_struct *tty)
1024 {
1025 struct usb_serial_port *port = tty->driver_data;
1026 struct digi_port *priv = usb_get_serial_port_data(port);
1027 int room;
1028 unsigned long flags = 0;
1029
1030 spin_lock_irqsave(&priv->dp_port_lock, flags);
1031
1032 if (priv->dp_write_urb_in_use)
1033 room = 0;
1034 else
1035 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1036
1037 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1038 dev_dbg(&port->dev, "digi_write_room: port=%d, room=%d\n", priv->dp_port_num, room);
1039 return room;
1040
1041 }
1042
1043 static int digi_chars_in_buffer(struct tty_struct *tty)
1044 {
1045 struct usb_serial_port *port = tty->driver_data;
1046 struct digi_port *priv = usb_get_serial_port_data(port);
1047
1048 if (priv->dp_write_urb_in_use) {
1049 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1050 priv->dp_port_num, port->bulk_out_size - 2);
1051 /* return(port->bulk_out_size - 2); */
1052 return 256;
1053 } else {
1054 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1055 priv->dp_port_num, priv->dp_out_buf_len);
1056 return priv->dp_out_buf_len;
1057 }
1058
1059 }
1060
1061 static void digi_dtr_rts(struct usb_serial_port *port, int on)
1062 {
1063 /* Adjust DTR and RTS */
1064 digi_set_modem_signals(port, on * (TIOCM_DTR | TIOCM_RTS), 1);
1065 }
1066
1067 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1068 {
1069 int ret;
1070 unsigned char buf[32];
1071 struct digi_port *priv = usb_get_serial_port_data(port);
1072 struct ktermios not_termios;
1073
1074 /* be sure the device is started up */
1075 if (digi_startup_device(port->serial) != 0)
1076 return -ENXIO;
1077
1078 /* read modem signals automatically whenever they change */
1079 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1080 buf[1] = priv->dp_port_num;
1081 buf[2] = DIGI_ENABLE;
1082 buf[3] = 0;
1083
1084 /* flush fifos */
1085 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1086 buf[5] = priv->dp_port_num;
1087 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1088 buf[7] = 0;
1089
1090 ret = digi_write_oob_command(port, buf, 8, 1);
1091 if (ret != 0)
1092 dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);
1093
1094 /* set termios settings */
1095 if (tty) {
1096 not_termios.c_cflag = ~tty->termios.c_cflag;
1097 not_termios.c_iflag = ~tty->termios.c_iflag;
1098 digi_set_termios(tty, port, &not_termios);
1099 }
1100 return 0;
1101 }
1102
1103
1104 static void digi_close(struct usb_serial_port *port)
1105 {
1106 DEFINE_WAIT(wait);
1107 int ret;
1108 unsigned char buf[32];
1109 struct digi_port *priv = usb_get_serial_port_data(port);
1110
1111 mutex_lock(&port->serial->disc_mutex);
1112 /* if disconnected, just clear flags */
1113 if (port->serial->disconnected)
1114 goto exit;
1115
1116 /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1117 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1118
1119 /* disable input flow control */
1120 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1121 buf[1] = priv->dp_port_num;
1122 buf[2] = DIGI_DISABLE;
1123 buf[3] = 0;
1124
1125 /* disable output flow control */
1126 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1127 buf[5] = priv->dp_port_num;
1128 buf[6] = DIGI_DISABLE;
1129 buf[7] = 0;
1130
1131 /* disable reading modem signals automatically */
1132 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1133 buf[9] = priv->dp_port_num;
1134 buf[10] = DIGI_DISABLE;
1135 buf[11] = 0;
1136
1137 /* disable receive */
1138 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1139 buf[13] = priv->dp_port_num;
1140 buf[14] = DIGI_DISABLE;
1141 buf[15] = 0;
1142
1143 /* flush fifos */
1144 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1145 buf[17] = priv->dp_port_num;
1146 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1147 buf[19] = 0;
1148
1149 ret = digi_write_oob_command(port, buf, 20, 0);
1150 if (ret != 0)
1151 dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n",
1152 ret);
1153 /* wait for final commands on oob port to complete */
1154 prepare_to_wait(&priv->dp_flush_wait, &wait,
1155 TASK_INTERRUPTIBLE);
1156 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1157 finish_wait(&priv->dp_flush_wait, &wait);
1158
1159 /* shutdown any outstanding bulk writes */
1160 usb_kill_urb(port->write_urb);
1161 exit:
1162 spin_lock_irq(&priv->dp_port_lock);
1163 priv->dp_write_urb_in_use = 0;
1164 wake_up_interruptible(&priv->dp_close_wait);
1165 spin_unlock_irq(&priv->dp_port_lock);
1166 mutex_unlock(&port->serial->disc_mutex);
1167 }
1168
1169
1170 /*
1171 * Digi Startup Device
1172 *
1173 * Starts reads on all ports. Must be called AFTER startup, with
1174 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1175 */
1176
1177 static int digi_startup_device(struct usb_serial *serial)
1178 {
1179 int i, ret = 0;
1180 struct digi_serial *serial_priv = usb_get_serial_data(serial);
1181 struct usb_serial_port *port;
1182
1183 /* be sure this happens exactly once */
1184 spin_lock(&serial_priv->ds_serial_lock);
1185 if (serial_priv->ds_device_started) {
1186 spin_unlock(&serial_priv->ds_serial_lock);
1187 return 0;
1188 }
1189 serial_priv->ds_device_started = 1;
1190 spin_unlock(&serial_priv->ds_serial_lock);
1191
1192 /* start reading from each bulk in endpoint for the device */
1193 /* set USB_DISABLE_SPD flag for write bulk urbs */
1194 for (i = 0; i < serial->type->num_ports + 1; i++) {
1195 port = serial->port[i];
1196 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1197 if (ret != 0) {
1198 dev_err(&port->dev,
1199 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1200 __func__, ret, i);
1201 break;
1202 }
1203 }
1204 return ret;
1205 }
1206
1207 static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
1208 {
1209 struct digi_port *priv;
1210
1211 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1212 if (!priv)
1213 return -ENOMEM;
1214
1215 spin_lock_init(&priv->dp_port_lock);
1216 priv->dp_port_num = port_num;
1217 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1218 init_waitqueue_head(&priv->dp_flush_wait);
1219 init_waitqueue_head(&priv->dp_close_wait);
1220 init_waitqueue_head(&priv->write_wait);
1221 priv->dp_port = port;
1222
1223 usb_set_serial_port_data(port, priv);
1224
1225 return 0;
1226 }
1227
1228 static int digi_startup(struct usb_serial *serial)
1229 {
1230 struct digi_serial *serial_priv;
1231 int ret;
1232
1233 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
1234 if (!serial_priv)
1235 return -ENOMEM;
1236
1237 spin_lock_init(&serial_priv->ds_serial_lock);
1238 serial_priv->ds_oob_port_num = serial->type->num_ports;
1239 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1240
1241 ret = digi_port_init(serial_priv->ds_oob_port,
1242 serial_priv->ds_oob_port_num);
1243 if (ret) {
1244 kfree(serial_priv);
1245 return ret;
1246 }
1247
1248 usb_set_serial_data(serial, serial_priv);
1249
1250 return 0;
1251 }
1252
1253
1254 static void digi_disconnect(struct usb_serial *serial)
1255 {
1256 int i;
1257
1258 /* stop reads and writes on all ports */
1259 for (i = 0; i < serial->type->num_ports + 1; i++) {
1260 usb_kill_urb(serial->port[i]->read_urb);
1261 usb_kill_urb(serial->port[i]->write_urb);
1262 }
1263 }
1264
1265
1266 static void digi_release(struct usb_serial *serial)
1267 {
1268 struct digi_serial *serial_priv;
1269 struct digi_port *priv;
1270
1271 serial_priv = usb_get_serial_data(serial);
1272
1273 priv = usb_get_serial_port_data(serial_priv->ds_oob_port);
1274 kfree(priv);
1275
1276 kfree(serial_priv);
1277 }
1278
1279 static int digi_port_probe(struct usb_serial_port *port)
1280 {
1281 return digi_port_init(port, port->port_number);
1282 }
1283
1284 static int digi_port_remove(struct usb_serial_port *port)
1285 {
1286 struct digi_port *priv;
1287
1288 priv = usb_get_serial_port_data(port);
1289 kfree(priv);
1290
1291 return 0;
1292 }
1293
1294 static void digi_read_bulk_callback(struct urb *urb)
1295 {
1296 struct usb_serial_port *port = urb->context;
1297 struct digi_port *priv;
1298 struct digi_serial *serial_priv;
1299 int ret;
1300 int status = urb->status;
1301
1302 /* port sanity check, do not resubmit if port is not valid */
1303 if (port == NULL)
1304 return;
1305 priv = usb_get_serial_port_data(port);
1306 if (priv == NULL) {
1307 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1308 __func__, status);
1309 return;
1310 }
1311 if (port->serial == NULL ||
1312 (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1313 dev_err(&port->dev, "%s: serial is bad or serial->private "
1314 "is NULL, status=%d\n", __func__, status);
1315 return;
1316 }
1317
1318 /* do not resubmit urb if it has any status error */
1319 if (status) {
1320 dev_err(&port->dev,
1321 "%s: nonzero read bulk status: status=%d, port=%d\n",
1322 __func__, status, priv->dp_port_num);
1323 return;
1324 }
1325
1326 /* handle oob or inb callback, do not resubmit if error */
1327 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1328 if (digi_read_oob_callback(urb) != 0)
1329 return;
1330 } else {
1331 if (digi_read_inb_callback(urb) != 0)
1332 return;
1333 }
1334
1335 /* continue read */
1336 ret = usb_submit_urb(urb, GFP_ATOMIC);
1337 if (ret != 0 && ret != -EPERM) {
1338 dev_err(&port->dev,
1339 "%s: failed resubmitting urb, ret=%d, port=%d\n",
1340 __func__, ret, priv->dp_port_num);
1341 }
1342
1343 }
1344
1345 /*
1346 * Digi Read INB Callback
1347 *
1348 * Digi Read INB Callback handles reads on the in band ports, sending
1349 * the data on to the tty subsystem. When called we know port and
1350 * port->private are not NULL and port->serial has been validated.
1351 * It returns 0 if successful, 1 if successful but the port is
1352 * throttled, and -1 if the sanity checks failed.
1353 */
1354
1355 static int digi_read_inb_callback(struct urb *urb)
1356 {
1357 struct usb_serial_port *port = urb->context;
1358 struct digi_port *priv = usb_get_serial_port_data(port);
1359 unsigned char *buf = urb->transfer_buffer;
1360 unsigned long flags;
1361 int opcode;
1362 int len;
1363 int port_status;
1364 unsigned char *data;
1365 int tty_flag, throttled;
1366
1367 /* short/multiple packet check */
1368 if (urb->actual_length < 2) {
1369 dev_warn(&port->dev, "short packet received\n");
1370 return -1;
1371 }
1372
1373 opcode = buf[0];
1374 len = buf[1];
1375
1376 if (urb->actual_length != len + 2) {
1377 dev_err(&port->dev, "malformed packet received: port=%d, opcode=%d, len=%d, actual_length=%u\n",
1378 priv->dp_port_num, opcode, len, urb->actual_length);
1379 return -1;
1380 }
1381
1382 if (opcode == DIGI_CMD_RECEIVE_DATA && len < 1) {
1383 dev_err(&port->dev, "malformed data packet received\n");
1384 return -1;
1385 }
1386
1387 spin_lock_irqsave(&priv->dp_port_lock, flags);
1388
1389 /* check for throttle; if set, do not resubmit read urb */
1390 /* indicate the read chain needs to be restarted on unthrottle */
1391 throttled = priv->dp_throttled;
1392 if (throttled)
1393 priv->dp_throttle_restart = 1;
1394
1395 /* receive data */
1396 if (opcode == DIGI_CMD_RECEIVE_DATA) {
1397 port_status = buf[2];
1398 data = &buf[3];
1399
1400 /* get flag from port_status */
1401 tty_flag = 0;
1402
1403 /* overrun is special, not associated with a char */
1404 if (port_status & DIGI_OVERRUN_ERROR)
1405 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1406
1407 /* break takes precedence over parity, */
1408 /* which takes precedence over framing errors */
1409 if (port_status & DIGI_BREAK_ERROR)
1410 tty_flag = TTY_BREAK;
1411 else if (port_status & DIGI_PARITY_ERROR)
1412 tty_flag = TTY_PARITY;
1413 else if (port_status & DIGI_FRAMING_ERROR)
1414 tty_flag = TTY_FRAME;
1415
1416 /* data length is len-1 (one byte of len is port_status) */
1417 --len;
1418 if (len > 0) {
1419 tty_insert_flip_string_fixed_flag(&port->port, data,
1420 tty_flag, len);
1421 tty_flip_buffer_push(&port->port);
1422 }
1423 }
1424 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1425
1426 if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1427 dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__);
1428 else if (opcode != DIGI_CMD_RECEIVE_DATA)
1429 dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode);
1430
1431 return throttled ? 1 : 0;
1432
1433 }
1434
1435
1436 /*
1437 * Digi Read OOB Callback
1438 *
1439 * Digi Read OOB Callback handles reads on the out of band port.
1440 * When called we know port and port->private are not NULL and
1441 * the port->serial is valid. It returns 0 if successful, and
1442 * -1 if the sanity checks failed.
1443 */
1444
1445 static int digi_read_oob_callback(struct urb *urb)
1446 {
1447
1448 struct usb_serial_port *port = urb->context;
1449 struct usb_serial *serial = port->serial;
1450 struct tty_struct *tty;
1451 struct digi_port *priv;
1452 unsigned char *buf = urb->transfer_buffer;
1453 int opcode, line, status, val;
1454 unsigned long flags;
1455 int i;
1456 unsigned int rts;
1457
1458 if (urb->actual_length < 4)
1459 return -1;
1460
1461 /* handle each oob command */
1462 for (i = 0; i < urb->actual_length - 3; i += 4) {
1463 opcode = buf[i];
1464 line = buf[i + 1];
1465 status = buf[i + 2];
1466 val = buf[i + 3];
1467
1468 dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",
1469 opcode, line, status, val);
1470
1471 if (status != 0 || line >= serial->type->num_ports)
1472 continue;
1473
1474 port = serial->port[line];
1475
1476 priv = usb_get_serial_port_data(port);
1477 if (priv == NULL)
1478 return -1;
1479
1480 tty = tty_port_tty_get(&port->port);
1481
1482 rts = 0;
1483 if (tty)
1484 rts = C_CRTSCTS(tty);
1485
1486 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1487 bool wakeup = false;
1488
1489 spin_lock_irqsave(&priv->dp_port_lock, flags);
1490 /* convert from digi flags to termiox flags */
1491 if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1492 priv->dp_modem_signals |= TIOCM_CTS;
1493 if (rts)
1494 wakeup = true;
1495 } else {
1496 priv->dp_modem_signals &= ~TIOCM_CTS;
1497 /* port must be open to use tty struct */
1498 }
1499 if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1500 priv->dp_modem_signals |= TIOCM_DSR;
1501 else
1502 priv->dp_modem_signals &= ~TIOCM_DSR;
1503 if (val & DIGI_READ_INPUT_SIGNALS_RI)
1504 priv->dp_modem_signals |= TIOCM_RI;
1505 else
1506 priv->dp_modem_signals &= ~TIOCM_RI;
1507 if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1508 priv->dp_modem_signals |= TIOCM_CD;
1509 else
1510 priv->dp_modem_signals &= ~TIOCM_CD;
1511
1512 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1513
1514 if (wakeup)
1515 tty_port_tty_wakeup(&port->port);
1516 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1517 spin_lock_irqsave(&priv->dp_port_lock, flags);
1518 priv->dp_transmit_idle = 1;
1519 wake_up_interruptible(&priv->dp_transmit_idle_wait);
1520 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1521 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1522 wake_up_interruptible(&priv->dp_flush_wait);
1523 }
1524 tty_kref_put(tty);
1525 }
1526 return 0;
1527
1528 }
1529
1530 module_usb_serial_driver(serial_drivers, id_table_combined);
1531
1532 MODULE_AUTHOR(DRIVER_AUTHOR);
1533 MODULE_DESCRIPTION(DRIVER_DESC);
1534 MODULE_LICENSE("GPL");
Linux with added FPC-III support