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
180struct 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
187struct 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
207static int digi_write_oob_command(struct usb_serial_port *port,
208 unsigned char *buf, int count, int interruptible);
209static int digi_write_inb_command(struct usb_serial_port *port,
210 unsigned char *buf, int count, unsigned long timeout);
211static int digi_set_modem_signals(struct usb_serial_port *port,
212 unsigned int modem_signals, int interruptible);
213static int digi_transmit_idle(struct usb_serial_port *port,
214 unsigned long timeout);
215static void digi_rx_throttle(struct tty_struct *tty);
216static void digi_rx_unthrottle(struct tty_struct *tty);
217static void digi_set_termios(struct tty_struct *tty,
218 struct usb_serial_port *port,
219 const struct ktermios *old_termios);
220static int digi_break_ctl(struct tty_struct *tty, int break_state);
221static int digi_tiocmget(struct tty_struct *tty);
222static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
223 unsigned int clear);
224static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
225 const unsigned char *buf, int count);
226static void digi_write_bulk_callback(struct urb *urb);
227static unsigned int digi_write_room(struct tty_struct *tty);
228static unsigned int digi_chars_in_buffer(struct tty_struct *tty);
229static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
230static void digi_close(struct usb_serial_port *port);
231static void digi_dtr_rts(struct usb_serial_port *port, int on);
232static int digi_startup_device(struct usb_serial *serial);
233static int digi_startup(struct usb_serial *serial);
234static void digi_disconnect(struct usb_serial *serial);
235static void digi_release(struct usb_serial *serial);
236static int digi_port_probe(struct usb_serial_port *port);
237static void digi_port_remove(struct usb_serial_port *port);
238static void digi_read_bulk_callback(struct urb *urb);
239static int digi_read_inb_callback(struct urb *urb);
240static int digi_read_oob_callback(struct urb *urb);
241
242
243static const struct usb_device_id id_table_combined[] = {
244 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
245 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
246 { } /* Terminating entry */
247};
248
249static const struct usb_device_id id_table_2[] = {
250 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
251 { } /* Terminating entry */
252};
253
254static const struct usb_device_id id_table_4[] = {
255 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
256 { } /* Terminating entry */
257};
258
259MODULE_DEVICE_TABLE(usb, id_table_combined);
260
261/* device info needed for the Digi serial converter */
262
263static struct usb_serial_driver digi_acceleport_2_device = {
264 .driver = {
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
293static struct usb_serial_driver digi_acceleport_4_device = {
294 .driver = {
295 .name = "digi_4",
296 },
297 .description = "Digi 4 port USB adapter",
298 .id_table = id_table_4,
299 .num_ports = 4,
300 .num_bulk_in = 5,
301 .num_bulk_out = 5,
302 .open = digi_open,
303 .close = digi_close,
304 .write = digi_write,
305 .write_room = digi_write_room,
306 .write_bulk_callback = digi_write_bulk_callback,
307 .read_bulk_callback = digi_read_bulk_callback,
308 .chars_in_buffer = digi_chars_in_buffer,
309 .throttle = digi_rx_throttle,
310 .unthrottle = digi_rx_unthrottle,
311 .set_termios = digi_set_termios,
312 .break_ctl = digi_break_ctl,
313 .tiocmget = digi_tiocmget,
314 .tiocmset = digi_tiocmset,
315 .attach = digi_startup,
316 .disconnect = digi_disconnect,
317 .release = digi_release,
318 .port_probe = digi_port_probe,
319 .port_remove = digi_port_remove,
320};
321
322static struct usb_serial_driver * const serial_drivers[] = {
323 &digi_acceleport_2_device, &digi_acceleport_4_device, NULL
324};
325
326/* Functions */
327
328/*
329 * Cond Wait Interruptible Timeout Irqrestore
330 *
331 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
332 * so that wake ups are not lost if they occur between the unlock
333 * and the sleep. In other words, spin_unlock_irqrestore and
334 * interruptible_sleep_on_timeout are "atomic" with respect to
335 * wake ups. This is used to implement condition variables.
336 *
337 * interruptible_sleep_on_timeout is deprecated and has been replaced
338 * with the equivalent code.
339 */
340
341static long cond_wait_interruptible_timeout_irqrestore(
342 wait_queue_head_t *q, long timeout,
343 spinlock_t *lock, unsigned long flags)
344__releases(lock)
345{
346 DEFINE_WAIT(wait);
347
348 prepare_to_wait(wq_head: q, wq_entry: &wait, TASK_INTERRUPTIBLE);
349 spin_unlock_irqrestore(lock, flags);
350 timeout = schedule_timeout(timeout);
351 finish_wait(wq_head: q, wq_entry: &wait);
352
353 return timeout;
354}
355
356/*
357 * Digi Write OOB Command
358 *
359 * Write commands on the out of band port. Commands are 4
360 * bytes each, multiple commands can be sent at once, and
361 * no command will be split across USB packets. Returns 0
362 * if successful, -EINTR if interrupted while sleeping and
363 * the interruptible flag is true, or a negative error
364 * returned by usb_submit_urb.
365 */
366
367static int digi_write_oob_command(struct usb_serial_port *port,
368 unsigned char *buf, int count, int interruptible)
369{
370 int ret = 0;
371 int len;
372 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(serial: port->serial)))->ds_oob_port;
373 struct digi_port *oob_priv = usb_get_serial_port_data(port: oob_port);
374 unsigned long flags;
375
376 dev_dbg(&port->dev,
377 "digi_write_oob_command: TOP: port=%d, count=%d\n",
378 oob_priv->dp_port_num, count);
379
380 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
381 while (count > 0) {
382 while (oob_priv->dp_write_urb_in_use) {
383 cond_wait_interruptible_timeout_irqrestore(
384 q: &oob_priv->write_wait, DIGI_RETRY_TIMEOUT,
385 lock: &oob_priv->dp_port_lock, flags);
386 if (interruptible && signal_pending(current))
387 return -EINTR;
388 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
389 }
390
391 /* len must be a multiple of 4, so commands are not split */
392 len = min(count, oob_port->bulk_out_size);
393 if (len > 4)
394 len &= ~3;
395 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
396 oob_port->write_urb->transfer_buffer_length = len;
397 ret = usb_submit_urb(urb: oob_port->write_urb, GFP_ATOMIC);
398 if (ret == 0) {
399 oob_priv->dp_write_urb_in_use = 1;
400 count -= len;
401 buf += len;
402 }
403 }
404 spin_unlock_irqrestore(lock: &oob_priv->dp_port_lock, flags);
405 if (ret)
406 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
407 __func__, ret);
408 return ret;
409
410}
411
412
413/*
414 * Digi Write In Band Command
415 *
416 * Write commands on the given port. Commands are 4
417 * bytes each, multiple commands can be sent at once, and
418 * no command will be split across USB packets. If timeout
419 * is non-zero, write in band command will return after
420 * waiting unsuccessfully for the URB status to clear for
421 * timeout ticks. Returns 0 if successful, or a negative
422 * error returned by digi_write.
423 */
424
425static int digi_write_inb_command(struct usb_serial_port *port,
426 unsigned char *buf, int count, unsigned long timeout)
427{
428 int ret = 0;
429 int len;
430 struct digi_port *priv = usb_get_serial_port_data(port);
431 unsigned char *data = port->write_urb->transfer_buffer;
432 unsigned long flags;
433
434 dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",
435 priv->dp_port_num, count);
436
437 if (timeout)
438 timeout += jiffies;
439 else
440 timeout = ULONG_MAX;
441
442 spin_lock_irqsave(&priv->dp_port_lock, flags);
443 while (count > 0 && ret == 0) {
444 while (priv->dp_write_urb_in_use &&
445 time_before(jiffies, timeout)) {
446 cond_wait_interruptible_timeout_irqrestore(
447 q: &priv->write_wait, DIGI_RETRY_TIMEOUT,
448 lock: &priv->dp_port_lock, flags);
449 if (signal_pending(current))
450 return -EINTR;
451 spin_lock_irqsave(&priv->dp_port_lock, flags);
452 }
453
454 /* len must be a multiple of 4 and small enough to */
455 /* guarantee the write will send buffered data first, */
456 /* so commands are in order with data and not split */
457 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
458 if (len > 4)
459 len &= ~3;
460
461 /* write any buffered data first */
462 if (priv->dp_out_buf_len > 0) {
463 data[0] = DIGI_CMD_SEND_DATA;
464 data[1] = priv->dp_out_buf_len;
465 memcpy(data + 2, priv->dp_out_buf,
466 priv->dp_out_buf_len);
467 memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
468 port->write_urb->transfer_buffer_length
469 = priv->dp_out_buf_len + 2 + len;
470 } else {
471 memcpy(data, buf, len);
472 port->write_urb->transfer_buffer_length = len;
473 }
474
475 ret = usb_submit_urb(urb: port->write_urb, GFP_ATOMIC);
476 if (ret == 0) {
477 priv->dp_write_urb_in_use = 1;
478 priv->dp_out_buf_len = 0;
479 count -= len;
480 buf += len;
481 }
482
483 }
484 spin_unlock_irqrestore(lock: &priv->dp_port_lock, flags);
485
486 if (ret)
487 dev_err(&port->dev,
488 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
489 __func__, ret, priv->dp_port_num);
490 return ret;
491}
492
493
494/*
495 * Digi Set Modem Signals
496 *
497 * Sets or clears DTR and RTS on the port, according to the
498 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
499 * for the modem_signals argument. Returns 0 if successful,
500 * -EINTR if interrupted while sleeping, or a non-zero error
501 * returned by usb_submit_urb.
502 */
503
504static int digi_set_modem_signals(struct usb_serial_port *port,
505 unsigned int modem_signals, int interruptible)
506{
507
508 int ret;
509 struct digi_port *port_priv = usb_get_serial_port_data(port);
510 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(serial: port->serial)))->ds_oob_port;
511 struct digi_port *oob_priv = usb_get_serial_port_data(port: oob_port);
512 unsigned char *data = oob_port->write_urb->transfer_buffer;
513 unsigned long flags;
514
515 dev_dbg(&port->dev,
516 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n",
517 port_priv->dp_port_num, modem_signals);
518
519 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
520 spin_lock(lock: &port_priv->dp_port_lock);
521
522 while (oob_priv->dp_write_urb_in_use) {
523 spin_unlock(lock: &port_priv->dp_port_lock);
524 cond_wait_interruptible_timeout_irqrestore(
525 q: &oob_priv->write_wait, DIGI_RETRY_TIMEOUT,
526 lock: &oob_priv->dp_port_lock, flags);
527 if (interruptible && signal_pending(current))
528 return -EINTR;
529 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
530 spin_lock(lock: &port_priv->dp_port_lock);
531 }
532 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
533 data[1] = port_priv->dp_port_num;
534 data[2] = (modem_signals & TIOCM_DTR) ?
535 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
536 data[3] = 0;
537 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
538 data[5] = port_priv->dp_port_num;
539 data[6] = (modem_signals & TIOCM_RTS) ?
540 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
541 data[7] = 0;
542
543 oob_port->write_urb->transfer_buffer_length = 8;
544
545 ret = usb_submit_urb(urb: oob_port->write_urb, GFP_ATOMIC);
546 if (ret == 0) {
547 oob_priv->dp_write_urb_in_use = 1;
548 port_priv->dp_modem_signals &= ~(TIOCM_DTR | TIOCM_RTS);
549 port_priv->dp_modem_signals |=
550 modem_signals & (TIOCM_DTR | TIOCM_RTS);
551 }
552 spin_unlock(lock: &port_priv->dp_port_lock);
553 spin_unlock_irqrestore(lock: &oob_priv->dp_port_lock, flags);
554 if (ret)
555 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
556 __func__, ret);
557 return ret;
558}
559
560/*
561 * Digi Transmit Idle
562 *
563 * Digi transmit idle waits, up to timeout ticks, for the transmitter
564 * to go idle. It returns 0 if successful or a negative error.
565 *
566 * There are race conditions here if more than one process is calling
567 * digi_transmit_idle on the same port at the same time. However, this
568 * is only called from close, and only one process can be in close on a
569 * port at a time, so its ok.
570 */
571
572static int digi_transmit_idle(struct usb_serial_port *port,
573 unsigned long timeout)
574{
575 int ret;
576 unsigned char buf[2];
577 struct digi_port *priv = usb_get_serial_port_data(port);
578 unsigned long flags;
579
580 spin_lock_irqsave(&priv->dp_port_lock, flags);
581 priv->dp_transmit_idle = 0;
582 spin_unlock_irqrestore(lock: &priv->dp_port_lock, flags);
583
584 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
585 buf[1] = 0;
586
587 timeout += jiffies;
588
589 ret = digi_write_inb_command(port, buf, count: 2, timeout: timeout - jiffies);
590 if (ret != 0)
591 return ret;
592
593 spin_lock_irqsave(&priv->dp_port_lock, flags);
594
595 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
596 cond_wait_interruptible_timeout_irqrestore(
597 q: &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
598 lock: &priv->dp_port_lock, flags);
599 if (signal_pending(current))
600 return -EINTR;
601 spin_lock_irqsave(&priv->dp_port_lock, flags);
602 }
603 priv->dp_transmit_idle = 0;
604 spin_unlock_irqrestore(lock: &priv->dp_port_lock, flags);
605 return 0;
606
607}
608
609
610static void digi_rx_throttle(struct tty_struct *tty)
611{
612 unsigned long flags;
613 struct usb_serial_port *port = tty->driver_data;
614 struct digi_port *priv = usb_get_serial_port_data(port);
615
616 /* stop receiving characters by not resubmitting the read urb */
617 spin_lock_irqsave(&priv->dp_port_lock, flags);
618 priv->dp_throttled = 1;
619 priv->dp_throttle_restart = 0;
620 spin_unlock_irqrestore(lock: &priv->dp_port_lock, flags);
621}
622
623
624static void digi_rx_unthrottle(struct tty_struct *tty)
625{
626 int ret = 0;
627 unsigned long flags;
628 struct usb_serial_port *port = tty->driver_data;
629 struct digi_port *priv = usb_get_serial_port_data(port);
630
631 spin_lock_irqsave(&priv->dp_port_lock, flags);
632
633 /* restart read chain */
634 if (priv->dp_throttle_restart)
635 ret = usb_submit_urb(urb: port->read_urb, GFP_ATOMIC);
636
637 /* turn throttle off */
638 priv->dp_throttled = 0;
639 priv->dp_throttle_restart = 0;
640
641 spin_unlock_irqrestore(lock: &priv->dp_port_lock, flags);
642
643 if (ret)
644 dev_err(&port->dev,
645 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
646 __func__, ret, priv->dp_port_num);
647}
648
649
650static void digi_set_termios(struct tty_struct *tty,
651 struct usb_serial_port *port,
652 const struct ktermios *old_termios)
653{
654 struct digi_port *priv = usb_get_serial_port_data(port);
655 struct device *dev = &port->dev;
656 unsigned int iflag = tty->termios.c_iflag;
657 unsigned int cflag = tty->termios.c_cflag;
658 unsigned int old_iflag = old_termios->c_iflag;
659 unsigned int old_cflag = old_termios->c_cflag;
660 unsigned char buf[32];
661 unsigned int modem_signals;
662 int arg, ret;
663 int i = 0;
664 speed_t baud;
665
666 dev_dbg(dev,
667 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n",
668 priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
669
670 /* set baud rate */
671 baud = tty_get_baud_rate(tty);
672 if (baud != tty_termios_baud_rate(termios: old_termios)) {
673 arg = -1;
674
675 /* reassert DTR and (maybe) RTS on transition from B0 */
676 if ((old_cflag & CBAUD) == B0) {
677 /* don't set RTS if using hardware flow control */
678 /* and throttling input */
679 modem_signals = TIOCM_DTR;
680 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
681 modem_signals |= TIOCM_RTS;
682 digi_set_modem_signals(port, modem_signals, interruptible: 1);
683 }
684 switch (baud) {
685 /* drop DTR and RTS on transition to B0 */
686 case 0: digi_set_modem_signals(port, modem_signals: 0, interruptible: 1); break;
687 case 50: arg = DIGI_BAUD_50; break;
688 case 75: arg = DIGI_BAUD_75; break;
689 case 110: arg = DIGI_BAUD_110; break;
690 case 150: arg = DIGI_BAUD_150; break;
691 case 200: arg = DIGI_BAUD_200; break;
692 case 300: arg = DIGI_BAUD_300; break;
693 case 600: arg = DIGI_BAUD_600; break;
694 case 1200: arg = DIGI_BAUD_1200; break;
695 case 1800: arg = DIGI_BAUD_1800; break;
696 case 2400: arg = DIGI_BAUD_2400; break;
697 case 4800: arg = DIGI_BAUD_4800; break;
698 case 9600: arg = DIGI_BAUD_9600; break;
699 case 19200: arg = DIGI_BAUD_19200; break;
700 case 38400: arg = DIGI_BAUD_38400; break;
701 case 57600: arg = DIGI_BAUD_57600; break;
702 case 115200: arg = DIGI_BAUD_115200; break;
703 case 230400: arg = DIGI_BAUD_230400; break;
704 case 460800: arg = DIGI_BAUD_460800; break;
705 default:
706 arg = DIGI_BAUD_9600;
707 baud = 9600;
708 break;
709 }
710 if (arg != -1) {
711 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
712 buf[i++] = priv->dp_port_num;
713 buf[i++] = arg;
714 buf[i++] = 0;
715 }
716 }
717 /* set parity */
718 tty->termios.c_cflag &= ~CMSPAR;
719
720 if ((cflag & (PARENB | PARODD)) != (old_cflag & (PARENB | PARODD))) {
721 if (cflag & PARENB) {
722 if (cflag & PARODD)
723 arg = DIGI_PARITY_ODD;
724 else
725 arg = DIGI_PARITY_EVEN;
726 } else {
727 arg = DIGI_PARITY_NONE;
728 }
729 buf[i++] = DIGI_CMD_SET_PARITY;
730 buf[i++] = priv->dp_port_num;
731 buf[i++] = arg;
732 buf[i++] = 0;
733 }
734 /* set word size */
735 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
736 arg = -1;
737 switch (cflag & CSIZE) {
738 case CS5: arg = DIGI_WORD_SIZE_5; break;
739 case CS6: arg = DIGI_WORD_SIZE_6; break;
740 case CS7: arg = DIGI_WORD_SIZE_7; break;
741 case CS8: arg = DIGI_WORD_SIZE_8; break;
742 default:
743 dev_dbg(dev,
744 "digi_set_termios: can't handle word size %d\n",
745 cflag & CSIZE);
746 break;
747 }
748
749 if (arg != -1) {
750 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
751 buf[i++] = priv->dp_port_num;
752 buf[i++] = arg;
753 buf[i++] = 0;
754 }
755
756 }
757
758 /* set stop bits */
759 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
760
761 if ((cflag & CSTOPB))
762 arg = DIGI_STOP_BITS_2;
763 else
764 arg = DIGI_STOP_BITS_1;
765
766 buf[i++] = DIGI_CMD_SET_STOP_BITS;
767 buf[i++] = priv->dp_port_num;
768 buf[i++] = arg;
769 buf[i++] = 0;
770
771 }
772
773 /* set input flow control */
774 if ((iflag & IXOFF) != (old_iflag & IXOFF) ||
775 (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
776 arg = 0;
777 if (iflag & IXOFF)
778 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
779 else
780 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
781
782 if (cflag & CRTSCTS) {
783 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
784
785 /* On USB-4 it is necessary to assert RTS prior */
786 /* to selecting RTS input flow control. */
787 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
788 buf[i++] = priv->dp_port_num;
789 buf[i++] = DIGI_RTS_ACTIVE;
790 buf[i++] = 0;
791
792 } else {
793 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
794 }
795 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
796 buf[i++] = priv->dp_port_num;
797 buf[i++] = arg;
798 buf[i++] = 0;
799 }
800
801 /* set output flow control */
802 if ((iflag & IXON) != (old_iflag & IXON) ||
803 (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
804 arg = 0;
805 if (iflag & IXON)
806 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
807 else
808 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
809
810 if (cflag & CRTSCTS)
811 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
812 else
813 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
814
815 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
816 buf[i++] = priv->dp_port_num;
817 buf[i++] = arg;
818 buf[i++] = 0;
819 }
820
821 /* set receive enable/disable */
822 if ((cflag & CREAD) != (old_cflag & CREAD)) {
823 if (cflag & CREAD)
824 arg = DIGI_ENABLE;
825 else
826 arg = DIGI_DISABLE;
827
828 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
829 buf[i++] = priv->dp_port_num;
830 buf[i++] = arg;
831 buf[i++] = 0;
832 }
833 ret = digi_write_oob_command(port, buf, count: i, interruptible: 1);
834 if (ret != 0)
835 dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret);
836 tty_encode_baud_rate(tty, ibaud: baud, obaud: baud);
837}
838
839
840static int digi_break_ctl(struct tty_struct *tty, int break_state)
841{
842 struct usb_serial_port *port = tty->driver_data;
843 unsigned char buf[4];
844
845 buf[0] = DIGI_CMD_BREAK_CONTROL;
846 buf[1] = 2; /* length */
847 buf[2] = break_state ? 1 : 0;
848 buf[3] = 0; /* pad */
849
850 return digi_write_inb_command(port, buf, count: 4, timeout: 0);
851}
852
853
854static 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(lock: &priv->dp_port_lock, flags);
864 return val;
865}
866
867
868static 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(lock: &priv->dp_port_lock, flags);
879 return digi_set_modem_signals(port, modem_signals: val, interruptible: 1);
880}
881
882
883static 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;
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(lock: &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(lock: &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(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(lock: &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
956static 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(lock: &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(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(lock: &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->port);
1021}
1022
1023static unsigned 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 unsigned long flags;
1028 unsigned int room;
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(lock: &priv->dp_port_lock, flags);
1038 dev_dbg(&port->dev, "digi_write_room: port=%d, room=%u\n", priv->dp_port_num, room);
1039 return room;
1040
1041}
1042
1043static unsigned 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 unsigned long flags;
1048 unsigned int chars;
1049
1050 spin_lock_irqsave(&priv->dp_port_lock, flags);
1051 if (priv->dp_write_urb_in_use)
1052 chars = port->bulk_out_size - 2;
1053 else
1054 chars = priv->dp_out_buf_len;
1055 spin_unlock_irqrestore(lock: &priv->dp_port_lock, flags);
1056
1057 dev_dbg(&port->dev, "%s: port=%d, chars=%d\n", __func__,
1058 priv->dp_port_num, chars);
1059 return chars;
1060}
1061
1062static void digi_dtr_rts(struct usb_serial_port *port, int on)
1063{
1064 /* Adjust DTR and RTS */
1065 digi_set_modem_signals(port, modem_signals: on * (TIOCM_DTR | TIOCM_RTS), interruptible: 1);
1066}
1067
1068static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1069{
1070 int ret;
1071 unsigned char buf[32];
1072 struct digi_port *priv = usb_get_serial_port_data(port);
1073 struct ktermios not_termios;
1074
1075 /* be sure the device is started up */
1076 if (digi_startup_device(serial: port->serial) != 0)
1077 return -ENXIO;
1078
1079 /* read modem signals automatically whenever they change */
1080 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1081 buf[1] = priv->dp_port_num;
1082 buf[2] = DIGI_ENABLE;
1083 buf[3] = 0;
1084
1085 /* flush fifos */
1086 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1087 buf[5] = priv->dp_port_num;
1088 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1089 buf[7] = 0;
1090
1091 ret = digi_write_oob_command(port, buf, count: 8, interruptible: 1);
1092 if (ret != 0)
1093 dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);
1094
1095 /* set termios settings */
1096 if (tty) {
1097 not_termios.c_cflag = ~tty->termios.c_cflag;
1098 not_termios.c_iflag = ~tty->termios.c_iflag;
1099 digi_set_termios(tty, port, old_termios: &not_termios);
1100 }
1101 return 0;
1102}
1103
1104
1105static void digi_close(struct usb_serial_port *port)
1106{
1107 DEFINE_WAIT(wait);
1108 int ret;
1109 unsigned char buf[32];
1110 struct digi_port *priv = usb_get_serial_port_data(port);
1111
1112 mutex_lock(&port->serial->disc_mutex);
1113 /* if disconnected, just clear flags */
1114 if (port->serial->disconnected)
1115 goto exit;
1116
1117 /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1118 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1119
1120 /* disable input flow control */
1121 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1122 buf[1] = priv->dp_port_num;
1123 buf[2] = DIGI_DISABLE;
1124 buf[3] = 0;
1125
1126 /* disable output flow control */
1127 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1128 buf[5] = priv->dp_port_num;
1129 buf[6] = DIGI_DISABLE;
1130 buf[7] = 0;
1131
1132 /* disable reading modem signals automatically */
1133 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1134 buf[9] = priv->dp_port_num;
1135 buf[10] = DIGI_DISABLE;
1136 buf[11] = 0;
1137
1138 /* disable receive */
1139 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1140 buf[13] = priv->dp_port_num;
1141 buf[14] = DIGI_DISABLE;
1142 buf[15] = 0;
1143
1144 /* flush fifos */
1145 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1146 buf[17] = priv->dp_port_num;
1147 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1148 buf[19] = 0;
1149
1150 ret = digi_write_oob_command(port, buf, count: 20, interruptible: 0);
1151 if (ret != 0)
1152 dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n",
1153 ret);
1154 /* wait for final commands on oob port to complete */
1155 prepare_to_wait(wq_head: &priv->dp_flush_wait, wq_entry: &wait,
1156 TASK_INTERRUPTIBLE);
1157 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1158 finish_wait(wq_head: &priv->dp_flush_wait, wq_entry: &wait);
1159
1160 /* shutdown any outstanding bulk writes */
1161 usb_kill_urb(urb: port->write_urb);
1162exit:
1163 spin_lock_irq(lock: &priv->dp_port_lock);
1164 priv->dp_write_urb_in_use = 0;
1165 wake_up_interruptible(&priv->dp_close_wait);
1166 spin_unlock_irq(lock: &priv->dp_port_lock);
1167 mutex_unlock(lock: &port->serial->disc_mutex);
1168}
1169
1170
1171/*
1172 * Digi Startup Device
1173 *
1174 * Starts reads on all ports. Must be called AFTER startup, with
1175 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1176 */
1177
1178static int digi_startup_device(struct usb_serial *serial)
1179{
1180 int i, ret = 0;
1181 struct digi_serial *serial_priv = usb_get_serial_data(serial);
1182 struct usb_serial_port *port;
1183
1184 /* be sure this happens exactly once */
1185 spin_lock(lock: &serial_priv->ds_serial_lock);
1186 if (serial_priv->ds_device_started) {
1187 spin_unlock(lock: &serial_priv->ds_serial_lock);
1188 return 0;
1189 }
1190 serial_priv->ds_device_started = 1;
1191 spin_unlock(lock: &serial_priv->ds_serial_lock);
1192
1193 /* start reading from each bulk in endpoint for the device */
1194 /* set USB_DISABLE_SPD flag for write bulk urbs */
1195 for (i = 0; i < serial->type->num_ports + 1; i++) {
1196 port = serial->port[i];
1197 ret = usb_submit_urb(urb: port->read_urb, GFP_KERNEL);
1198 if (ret != 0) {
1199 dev_err(&port->dev,
1200 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1201 __func__, ret, i);
1202 break;
1203 }
1204 }
1205 return ret;
1206}
1207
1208static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
1209{
1210 struct digi_port *priv;
1211
1212 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1213 if (!priv)
1214 return -ENOMEM;
1215
1216 spin_lock_init(&priv->dp_port_lock);
1217 priv->dp_port_num = port_num;
1218 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1219 init_waitqueue_head(&priv->dp_flush_wait);
1220 init_waitqueue_head(&priv->dp_close_wait);
1221 init_waitqueue_head(&priv->write_wait);
1222 priv->dp_port = port;
1223
1224 usb_set_serial_port_data(port, data: priv);
1225
1226 return 0;
1227}
1228
1229static int digi_startup(struct usb_serial *serial)
1230{
1231 struct digi_serial *serial_priv;
1232 int ret;
1233
1234 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
1235 if (!serial_priv)
1236 return -ENOMEM;
1237
1238 spin_lock_init(&serial_priv->ds_serial_lock);
1239 serial_priv->ds_oob_port_num = serial->type->num_ports;
1240 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1241
1242 ret = digi_port_init(port: serial_priv->ds_oob_port,
1243 port_num: serial_priv->ds_oob_port_num);
1244 if (ret) {
1245 kfree(objp: serial_priv);
1246 return ret;
1247 }
1248
1249 usb_set_serial_data(serial, data: serial_priv);
1250
1251 return 0;
1252}
1253
1254
1255static void digi_disconnect(struct usb_serial *serial)
1256{
1257 int i;
1258
1259 /* stop reads and writes on all ports */
1260 for (i = 0; i < serial->type->num_ports + 1; i++) {
1261 usb_kill_urb(urb: serial->port[i]->read_urb);
1262 usb_kill_urb(urb: serial->port[i]->write_urb);
1263 }
1264}
1265
1266
1267static void digi_release(struct usb_serial *serial)
1268{
1269 struct digi_serial *serial_priv;
1270 struct digi_port *priv;
1271
1272 serial_priv = usb_get_serial_data(serial);
1273
1274 priv = usb_get_serial_port_data(port: serial_priv->ds_oob_port);
1275 kfree(objp: priv);
1276
1277 kfree(objp: serial_priv);
1278}
1279
1280static int digi_port_probe(struct usb_serial_port *port)
1281{
1282 return digi_port_init(port, port_num: port->port_number);
1283}
1284
1285static void digi_port_remove(struct usb_serial_port *port)
1286{
1287 struct digi_port *priv;
1288
1289 priv = usb_get_serial_port_data(port);
1290 kfree(objp: priv);
1291}
1292
1293static void digi_read_bulk_callback(struct urb *urb)
1294{
1295 struct usb_serial_port *port = urb->context;
1296 struct digi_port *priv;
1297 struct digi_serial *serial_priv;
1298 int ret;
1299 int status = urb->status;
1300
1301 /* port sanity check, do not resubmit if port is not valid */
1302 if (port == NULL)
1303 return;
1304 priv = usb_get_serial_port_data(port);
1305 if (priv == NULL) {
1306 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1307 __func__, status);
1308 return;
1309 }
1310 if (port->serial == NULL ||
1311 (serial_priv = usb_get_serial_data(serial: port->serial)) == NULL) {
1312 dev_err(&port->dev, "%s: serial is bad or serial->private "
1313 "is NULL, status=%d\n", __func__, status);
1314 return;
1315 }
1316
1317 /* do not resubmit urb if it has any status error */
1318 if (status) {
1319 dev_err(&port->dev,
1320 "%s: nonzero read bulk status: status=%d, port=%d\n",
1321 __func__, status, priv->dp_port_num);
1322 return;
1323 }
1324
1325 /* handle oob or inb callback, do not resubmit if error */
1326 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1327 if (digi_read_oob_callback(urb) != 0)
1328 return;
1329 } else {
1330 if (digi_read_inb_callback(urb) != 0)
1331 return;
1332 }
1333
1334 /* continue read */
1335 ret = usb_submit_urb(urb, GFP_ATOMIC);
1336 if (ret != 0 && ret != -EPERM) {
1337 dev_err(&port->dev,
1338 "%s: failed resubmitting urb, ret=%d, port=%d\n",
1339 __func__, ret, priv->dp_port_num);
1340 }
1341
1342}
1343
1344/*
1345 * Digi Read INB Callback
1346 *
1347 * Digi Read INB Callback handles reads on the in band ports, sending
1348 * the data on to the tty subsystem. When called we know port and
1349 * port->private are not NULL and port->serial has been validated.
1350 * It returns 0 if successful, 1 if successful but the port is
1351 * throttled, and -1 if the sanity checks failed.
1352 */
1353
1354static int digi_read_inb_callback(struct urb *urb)
1355{
1356 struct usb_serial_port *port = urb->context;
1357 struct digi_port *priv = usb_get_serial_port_data(port);
1358 unsigned char *buf = urb->transfer_buffer;
1359 unsigned long flags;
1360 int opcode;
1361 int len;
1362 int port_status;
1363 unsigned char *data;
1364 int tty_flag, throttled;
1365
1366 /* short/multiple packet check */
1367 if (urb->actual_length < 2) {
1368 dev_warn(&port->dev, "short packet received\n");
1369 return -1;
1370 }
1371
1372 opcode = buf[0];
1373 len = buf[1];
1374
1375 if (urb->actual_length != len + 2) {
1376 dev_err(&port->dev, "malformed packet received: port=%d, opcode=%d, len=%d, actual_length=%u\n",
1377 priv->dp_port_num, opcode, len, urb->actual_length);
1378 return -1;
1379 }
1380
1381 if (opcode == DIGI_CMD_RECEIVE_DATA && len < 1) {
1382 dev_err(&port->dev, "malformed data packet received\n");
1383 return -1;
1384 }
1385
1386 spin_lock_irqsave(&priv->dp_port_lock, flags);
1387
1388 /* check for throttle; if set, do not resubmit read urb */
1389 /* indicate the read chain needs to be restarted on unthrottle */
1390 throttled = priv->dp_throttled;
1391 if (throttled)
1392 priv->dp_throttle_restart = 1;
1393
1394 /* receive data */
1395 if (opcode == DIGI_CMD_RECEIVE_DATA) {
1396 port_status = buf[2];
1397 data = &buf[3];
1398
1399 /* get flag from port_status */
1400 tty_flag = 0;
1401
1402 /* overrun is special, not associated with a char */
1403 if (port_status & DIGI_OVERRUN_ERROR)
1404 tty_insert_flip_char(port: &port->port, ch: 0, TTY_OVERRUN);
1405
1406 /* break takes precedence over parity, */
1407 /* which takes precedence over framing errors */
1408 if (port_status & DIGI_BREAK_ERROR)
1409 tty_flag = TTY_BREAK;
1410 else if (port_status & DIGI_PARITY_ERROR)
1411 tty_flag = TTY_PARITY;
1412 else if (port_status & DIGI_FRAMING_ERROR)
1413 tty_flag = TTY_FRAME;
1414
1415 /* data length is len-1 (one byte of len is port_status) */
1416 --len;
1417 if (len > 0) {
1418 tty_insert_flip_string_fixed_flag(port: &port->port, chars: data,
1419 flag: tty_flag, size: len);
1420 tty_flip_buffer_push(port: &port->port);
1421 }
1422 }
1423 spin_unlock_irqrestore(lock: &priv->dp_port_lock, flags);
1424
1425 if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1426 dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__);
1427 else if (opcode != DIGI_CMD_RECEIVE_DATA)
1428 dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode);
1429
1430 return throttled ? 1 : 0;
1431
1432}
1433
1434
1435/*
1436 * Digi Read OOB Callback
1437 *
1438 * Digi Read OOB Callback handles reads on the out of band port.
1439 * When called we know port and port->private are not NULL and
1440 * the port->serial is valid. It returns 0 if successful, and
1441 * -1 if the sanity checks failed.
1442 */
1443
1444static int digi_read_oob_callback(struct urb *urb)
1445{
1446
1447 struct usb_serial_port *port = urb->context;
1448 struct usb_serial *serial = port->serial;
1449 struct tty_struct *tty;
1450 struct digi_port *priv;
1451 unsigned char *buf = urb->transfer_buffer;
1452 int opcode, line, status, val;
1453 unsigned long flags;
1454 int i;
1455 unsigned int rts;
1456
1457 if (urb->actual_length < 4)
1458 return -1;
1459
1460 /* handle each oob command */
1461 for (i = 0; i < urb->actual_length - 3; i += 4) {
1462 opcode = buf[i];
1463 line = buf[i + 1];
1464 status = buf[i + 2];
1465 val = buf[i + 3];
1466
1467 dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",
1468 opcode, line, status, val);
1469
1470 if (status != 0 || line >= serial->type->num_ports)
1471 continue;
1472
1473 port = serial->port[line];
1474
1475 priv = usb_get_serial_port_data(port);
1476 if (priv == NULL)
1477 return -1;
1478
1479 tty = tty_port_tty_get(port: &port->port);
1480
1481 rts = 0;
1482 if (tty)
1483 rts = C_CRTSCTS(tty);
1484
1485 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1486 bool wakeup = false;
1487
1488 spin_lock_irqsave(&priv->dp_port_lock, flags);
1489 /* convert from digi flags to termiox flags */
1490 if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1491 priv->dp_modem_signals |= TIOCM_CTS;
1492 if (rts)
1493 wakeup = true;
1494 } else {
1495 priv->dp_modem_signals &= ~TIOCM_CTS;
1496 /* port must be open to use tty struct */
1497 }
1498 if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1499 priv->dp_modem_signals |= TIOCM_DSR;
1500 else
1501 priv->dp_modem_signals &= ~TIOCM_DSR;
1502 if (val & DIGI_READ_INPUT_SIGNALS_RI)
1503 priv->dp_modem_signals |= TIOCM_RI;
1504 else
1505 priv->dp_modem_signals &= ~TIOCM_RI;
1506 if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1507 priv->dp_modem_signals |= TIOCM_CD;
1508 else
1509 priv->dp_modem_signals &= ~TIOCM_CD;
1510
1511 spin_unlock_irqrestore(lock: &priv->dp_port_lock, flags);
1512
1513 if (wakeup)
1514 tty_port_tty_wakeup(port: &port->port);
1515 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1516 spin_lock_irqsave(&priv->dp_port_lock, flags);
1517 priv->dp_transmit_idle = 1;
1518 wake_up_interruptible(&priv->dp_transmit_idle_wait);
1519 spin_unlock_irqrestore(lock: &priv->dp_port_lock, flags);
1520 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1521 wake_up_interruptible(&priv->dp_flush_wait);
1522 }
1523 tty_kref_put(tty);
1524 }
1525 return 0;
1526
1527}
1528
1529module_usb_serial_driver(serial_drivers, id_table_combined);
1530
1531MODULE_AUTHOR(DRIVER_AUTHOR);
1532MODULE_DESCRIPTION(DRIVER_DESC);
1533MODULE_LICENSE("GPL");
1534

source code of linux/drivers/usb/serial/digi_acceleport.c