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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / usb / serial / quatech2.c
bloba317bdbd00ad5c56a25e27dbf0921b2deff0ae15
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * usb-serial driver for Quatech USB 2 devices
4 *
5 * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
6 *
7 * These devices all have only 1 bulk in and 1 bulk out that is shared
8 * for all serial ports.
9 *
10 */
11
12 #include <linux/unaligned.h>
13 #include <linux/errno.h>
14 #include <linux/slab.h>
15 #include <linux/tty.h>
16 #include <linux/tty_driver.h>
17 #include <linux/tty_flip.h>
18 #include <linux/module.h>
19 #include <linux/serial.h>
20 #include <linux/usb.h>
21 #include <linux/usb/serial.h>
22 #include <linux/serial_reg.h>
23 #include <linux/uaccess.h>
24
25 /* default urb timeout for usb operations */
26 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
27
28 #define QT_OPEN_CLOSE_CHANNEL 0xca
29 #define QT_SET_GET_DEVICE 0xc2
30 #define QT_SET_GET_REGISTER 0xc0
31 #define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
32 #define QT_SET_ATF 0xcd
33 #define QT_TRANSFER_IN 0xc0
34 #define QT_HW_FLOW_CONTROL_MASK 0xc5
35 #define QT_SW_FLOW_CONTROL_MASK 0xc6
36 #define QT2_BREAK_CONTROL 0xc8
37 #define QT2_GET_SET_UART 0xc1
38 #define QT2_FLUSH_DEVICE 0xc4
39 #define QT2_GET_SET_QMCR 0xe1
40 #define QT2_QMCR_RS232 0x40
41 #define QT2_QMCR_RS422 0x10
42
43 #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
44
45 #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR)
46
47 /* status bytes for the device */
48 #define QT2_CONTROL_BYTE 0x1b
49 #define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */
50 #define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */
51 #define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */
52 #define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */
53 #define QT2_REC_FLUSH 0x04 /* no following info */
54 #define QT2_XMIT_FLUSH 0x05 /* no following info */
55 #define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */
56
57 #define MAX_BAUD_RATE 921600
58 #define DEFAULT_BAUD_RATE 9600
59
60 #define QT2_READ_BUFFER_SIZE 512 /* size of read buffer */
61 #define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */
62 #define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */
63
64 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
65
66 #define USB_VENDOR_ID_QUATECH 0x061d
67 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */
68 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */
69 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */
70 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */
71 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */
72 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */
73 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */
74
75 struct qt2_device_detail {
76 int product_id;
77 int num_ports;
78 };
79
80 #define QT_DETAILS(prod, ports) \
81 .product_id = (prod), \
82 .num_ports = (ports)
83
84 static const struct qt2_device_detail qt2_device_details[] = {
85 {QT_DETAILS(QUATECH_SSU2_100, 1)},
86 {QT_DETAILS(QUATECH_DSU2_400, 2)},
87 {QT_DETAILS(QUATECH_DSU2_100, 2)},
88 {QT_DETAILS(QUATECH_QSU2_400, 4)},
89 {QT_DETAILS(QUATECH_QSU2_100, 4)},
90 {QT_DETAILS(QUATECH_ESU2_400, 8)},
91 {QT_DETAILS(QUATECH_ESU2_100, 8)},
92 {QT_DETAILS(0, 0)} /* Terminating entry */
93 };
94
95 static const struct usb_device_id id_table[] = {
96 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
97 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
98 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
99 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
100 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
101 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
102 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
103 {} /* Terminating entry */
104 };
105 MODULE_DEVICE_TABLE(usb, id_table);
106
107 struct qt2_serial_private {
108 unsigned char current_port; /* current port for incoming data */
109
110 struct urb *read_urb; /* shared among all ports */
111 char *read_buffer;
112 };
113
114 struct qt2_port_private {
115 u8 device_port;
116
117 spinlock_t urb_lock;
118 bool urb_in_use;
119 struct urb *write_urb;
120 char *write_buffer;
121
122 spinlock_t lock;
123 u8 shadowLSR;
124 u8 shadowMSR;
125
126 struct usb_serial_port *port;
127 };
128
129 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
130 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
131 static void qt2_write_bulk_callback(struct urb *urb);
132 static void qt2_read_bulk_callback(struct urb *urb);
133
134 static void qt2_release(struct usb_serial *serial)
135 {
136 struct qt2_serial_private *serial_priv;
137
138 serial_priv = usb_get_serial_data(serial);
139
140 usb_kill_urb(serial_priv->read_urb);
141 usb_free_urb(serial_priv->read_urb);
142 kfree(serial_priv->read_buffer);
143 kfree(serial_priv);
144 }
145
146 static inline int calc_baud_divisor(int baudrate)
147 {
148 int divisor, rem;
149
150 divisor = MAX_BAUD_RATE / baudrate;
151 rem = MAX_BAUD_RATE % baudrate;
152 /* Round to nearest divisor */
153 if (((rem * 2) >= baudrate) && (baudrate != 110))
154 divisor++;
155
156 return divisor;
157 }
158
159 static inline int qt2_set_port_config(struct usb_device *dev,
160 unsigned char port_number,
161 u16 baudrate, u16 lcr)
162 {
163 int divisor = calc_baud_divisor(baudrate);
164 u16 index = ((u16) (lcr << 8) | (u16) (port_number));
165
166 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
167 QT2_GET_SET_UART, 0x40,
168 divisor, index, NULL, 0, QT2_USB_TIMEOUT);
169 }
170
171 static inline int qt2_control_msg(struct usb_device *dev,
172 u8 request, u16 data, u16 index)
173 {
174 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
175 request, 0x40, data, index,
176 NULL, 0, QT2_USB_TIMEOUT);
177 }
178
179 static inline int qt2_getregister(struct usb_device *dev,
180 u8 uart,
181 u8 reg,
182 u8 *data)
183 {
184 int ret;
185
186 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
187 QT_SET_GET_REGISTER, 0xc0, reg,
188 uart, data, sizeof(*data), QT2_USB_TIMEOUT);
189 if (ret < (int)sizeof(*data)) {
190 if (ret >= 0)
191 ret = -EIO;
192 }
193
194 return ret;
195 }
196
197 static inline int qt2_setregister(struct usb_device *dev,
198 u8 uart, u8 reg, u16 data)
199 {
200 u16 value = (data << 8) | reg;
201
202 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
203 QT_SET_GET_REGISTER, 0x40, value, uart,
204 NULL, 0, QT2_USB_TIMEOUT);
205 }
206
207 static inline int update_mctrl(struct qt2_port_private *port_priv,
208 unsigned int set, unsigned int clear)
209 {
210 struct usb_serial_port *port = port_priv->port;
211 struct usb_device *dev = port->serial->dev;
212 unsigned urb_value;
213 int status;
214
215 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
216 dev_dbg(&port->dev,
217 "update_mctrl - DTR|RTS not being set|cleared\n");
218 return 0; /* no change */
219 }
220
221 clear &= ~set; /* 'set' takes precedence over 'clear' */
222 urb_value = 0;
223 if (set & TIOCM_DTR)
224 urb_value |= UART_MCR_DTR;
225 if (set & TIOCM_RTS)
226 urb_value |= UART_MCR_RTS;
227
228 status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
229 urb_value);
230 if (status < 0)
231 dev_err(&port->dev,
232 "update_mctrl - Error from MODEM_CTRL urb: %i\n",
233 status);
234 return status;
235 }
236
237 static int qt2_calc_num_ports(struct usb_serial *serial,
238 struct usb_serial_endpoints *epds)
239 {
240 struct qt2_device_detail d;
241 int i;
242
243 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
244 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
245 return d.num_ports;
246 }
247
248 /* we didn't recognize the device */
249 dev_err(&serial->dev->dev,
250 "don't know the number of ports, assuming 1\n");
251
252 return 1;
253 }
254
255 static void qt2_set_termios(struct tty_struct *tty,
256 struct usb_serial_port *port,
257 const struct ktermios *old_termios)
258 {
259 struct usb_device *dev = port->serial->dev;
260 struct qt2_port_private *port_priv;
261 struct ktermios *termios = &tty->termios;
262 u16 baud;
263 unsigned int cflag = termios->c_cflag;
264 u16 new_lcr = 0;
265 int status;
266
267 port_priv = usb_get_serial_port_data(port);
268
269 if (cflag & PARENB) {
270 if (cflag & PARODD)
271 new_lcr |= UART_LCR_PARITY;
272 else
273 new_lcr |= SERIAL_EVEN_PARITY;
274 }
275
276 new_lcr |= UART_LCR_WLEN(tty_get_char_size(cflag));
277
278 baud = tty_get_baud_rate(tty);
279 if (!baud)
280 baud = 9600;
281
282 status = qt2_set_port_config(dev, port_priv->device_port, baud,
283 new_lcr);
284 if (status < 0)
285 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
286 __func__, status);
287
288 if (cflag & CRTSCTS)
289 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
290 SERIAL_CRTSCTS,
291 port_priv->device_port);
292 else
293 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
294 0, port_priv->device_port);
295 if (status < 0)
296 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
297 __func__, status);
298
299 if (I_IXOFF(tty) || I_IXON(tty)) {
300 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
301
302 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
303 x, port_priv->device_port);
304 } else
305 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
306 0, port_priv->device_port);
307
308 if (status < 0)
309 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
310 __func__, status);
311
312 }
313
314 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
315 {
316 struct usb_serial *serial;
317 struct qt2_port_private *port_priv;
318 u8 *data;
319 u16 device_port;
320 int status;
321 unsigned long flags;
322
323 device_port = port->port_number;
324
325 serial = port->serial;
326
327 port_priv = usb_get_serial_port_data(port);
328
329 /* set the port to RS232 mode */
330 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
331 QT2_QMCR_RS232, device_port);
332 if (status < 0) {
333 dev_err(&port->dev,
334 "%s failed to set RS232 mode for port %i error %i\n",
335 __func__, device_port, status);
336 return status;
337 }
338
339 data = kzalloc(2, GFP_KERNEL);
340 if (!data)
341 return -ENOMEM;
342
343 /* open the port */
344 status = usb_control_msg(serial->dev,
345 usb_rcvctrlpipe(serial->dev, 0),
346 QT_OPEN_CLOSE_CHANNEL,
347 0xc0, 0,
348 device_port, data, 2, QT2_USB_TIMEOUT);
349
350 if (status < 2) {
351 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
352 status);
353 if (status >= 0)
354 status = -EIO;
355 kfree(data);
356 return status;
357 }
358
359 spin_lock_irqsave(&port_priv->lock, flags);
360 port_priv->shadowLSR = data[0];
361 port_priv->shadowMSR = data[1];
362 spin_unlock_irqrestore(&port_priv->lock, flags);
363
364 kfree(data);
365
366 /* set to default speed and 8bit word size */
367 status = qt2_set_port_config(serial->dev, device_port,
368 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
369 if (status < 0) {
370 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
371 __func__, device_port);
372 return status;
373 }
374
375 port_priv->device_port = (u8) device_port;
376
377 if (tty)
378 qt2_set_termios(tty, port, &tty->termios);
379
380 return 0;
381
382 }
383
384 static void qt2_close(struct usb_serial_port *port)
385 {
386 struct usb_serial *serial;
387 struct qt2_port_private *port_priv;
388 int i;
389
390 serial = port->serial;
391 port_priv = usb_get_serial_port_data(port);
392
393 usb_kill_urb(port_priv->write_urb);
394
395 /* flush the port transmit buffer */
396 i = usb_control_msg(serial->dev,
397 usb_sndctrlpipe(serial->dev, 0),
398 QT2_FLUSH_DEVICE, 0x40, 1,
399 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
400
401 if (i < 0)
402 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
403 __func__, i);
404
405 /* flush the port receive buffer */
406 i = usb_control_msg(serial->dev,
407 usb_sndctrlpipe(serial->dev, 0),
408 QT2_FLUSH_DEVICE, 0x40, 0,
409 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
410
411 if (i < 0)
412 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
413 __func__, i);
414
415 /* close the port */
416 i = usb_control_msg(serial->dev,
417 usb_sndctrlpipe(serial->dev, 0),
418 QT_OPEN_CLOSE_CHANNEL,
419 0x40, 0,
420 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
421
422 if (i < 0)
423 dev_err(&port->dev, "%s - close port failed %i\n",
424 __func__, i);
425 }
426
427 static void qt2_disconnect(struct usb_serial *serial)
428 {
429 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
430
431 usb_kill_urb(serial_priv->read_urb);
432 }
433
434 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
435 {
436 switch (*ch) {
437 case QT2_LINE_STATUS:
438 qt2_update_lsr(port, ch + 1);
439 break;
440 case QT2_MODEM_STATUS:
441 qt2_update_msr(port, ch + 1);
442 break;
443 }
444 }
445
446 static void qt2_process_read_urb(struct urb *urb)
447 {
448 struct usb_serial *serial;
449 struct qt2_serial_private *serial_priv;
450 struct usb_serial_port *port;
451 bool escapeflag;
452 unsigned char *ch;
453 int i;
454 unsigned char newport;
455 int len = urb->actual_length;
456
457 if (!len)
458 return;
459
460 ch = urb->transfer_buffer;
461 serial = urb->context;
462 serial_priv = usb_get_serial_data(serial);
463 port = serial->port[serial_priv->current_port];
464
465 for (i = 0; i < urb->actual_length; i++) {
466 ch = (unsigned char *)urb->transfer_buffer + i;
467 if ((i <= (len - 3)) &&
468 (*ch == QT2_CONTROL_BYTE) &&
469 (*(ch + 1) == QT2_CONTROL_BYTE)) {
470 escapeflag = false;
471 switch (*(ch + 2)) {
472 case QT2_LINE_STATUS:
473 case QT2_MODEM_STATUS:
474 if (i > (len - 4)) {
475 dev_warn(&port->dev,
476 "%s - status message too short\n",
477 __func__);
478 break;
479 }
480 qt2_process_status(port, ch + 2);
481 i += 3;
482 escapeflag = true;
483 break;
484 case QT2_XMIT_HOLD:
485 if (i > (len - 5)) {
486 dev_warn(&port->dev,
487 "%s - xmit_empty message too short\n",
488 __func__);
489 break;
490 }
491 /* bytes_written = (ch[1] << 4) + ch[0]; */
492 i += 4;
493 escapeflag = true;
494 break;
495 case QT2_CHANGE_PORT:
496 if (i > (len - 4)) {
497 dev_warn(&port->dev,
498 "%s - change_port message too short\n",
499 __func__);
500 break;
501 }
502 tty_flip_buffer_push(&port->port);
503
504 newport = *(ch + 3);
505
506 if (newport > serial->num_ports) {
507 dev_err(&port->dev,
508 "%s - port change to invalid port: %i\n",
509 __func__, newport);
510 break;
511 }
512
513 serial_priv->current_port = newport;
514 port = serial->port[serial_priv->current_port];
515 i += 3;
516 escapeflag = true;
517 break;
518 case QT2_REC_FLUSH:
519 case QT2_XMIT_FLUSH:
520 i += 2;
521 escapeflag = true;
522 break;
523 case QT2_CONTROL_ESCAPE:
524 tty_insert_flip_string(&port->port, ch, 2);
525 i += 2;
526 escapeflag = true;
527 break;
528 default:
529 dev_warn(&port->dev,
530 "%s - unsupported command %i\n",
531 __func__, *(ch + 2));
532 break;
533 }
534 if (escapeflag)
535 continue;
536 }
537
538 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
539 }
540
541 tty_flip_buffer_push(&port->port);
542 }
543
544 static void qt2_write_bulk_callback(struct urb *urb)
545 {
546 struct usb_serial_port *port;
547 struct qt2_port_private *port_priv;
548 unsigned long flags;
549
550 port = urb->context;
551 port_priv = usb_get_serial_port_data(port);
552
553 spin_lock_irqsave(&port_priv->urb_lock, flags);
554
555 port_priv->urb_in_use = false;
556 usb_serial_port_softint(port);
557
558 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
559
560 }
561
562 static void qt2_read_bulk_callback(struct urb *urb)
563 {
564 struct usb_serial *serial = urb->context;
565 int status;
566
567 if (urb->status) {
568 dev_warn(&serial->dev->dev,
569 "%s - non-zero urb status: %i\n", __func__,
570 urb->status);
571 return;
572 }
573
574 qt2_process_read_urb(urb);
575
576 status = usb_submit_urb(urb, GFP_ATOMIC);
577 if (status != 0)
578 dev_err(&serial->dev->dev,
579 "%s - resubmit read urb failed: %i\n",
580 __func__, status);
581 }
582
583 static int qt2_setup_urbs(struct usb_serial *serial)
584 {
585 struct usb_serial_port *port0;
586 struct qt2_serial_private *serial_priv;
587 int status;
588
589 port0 = serial->port[0];
590
591 serial_priv = usb_get_serial_data(serial);
592 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
593 if (!serial_priv->read_urb)
594 return -ENOMEM;
595
596 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
597 usb_rcvbulkpipe(serial->dev,
598 port0->bulk_in_endpointAddress),
599 serial_priv->read_buffer,
600 QT2_READ_BUFFER_SIZE,
601 qt2_read_bulk_callback, serial);
602
603 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
604 if (status != 0) {
605 dev_err(&serial->dev->dev,
606 "%s - submit read urb failed %i\n", __func__, status);
607 usb_free_urb(serial_priv->read_urb);
608 return status;
609 }
610
611 return 0;
612 }
613
614 static int qt2_attach(struct usb_serial *serial)
615 {
616 struct qt2_serial_private *serial_priv;
617 int status;
618
619 /* power on unit */
620 status = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
621 0xc2, 0x40, 0x8000, 0, NULL, 0,
622 QT2_USB_TIMEOUT);
623 if (status < 0) {
624 dev_err(&serial->dev->dev,
625 "%s - failed to power on unit: %i\n", __func__, status);
626 return status;
627 }
628
629 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
630 if (!serial_priv)
631 return -ENOMEM;
632
633 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
634 if (!serial_priv->read_buffer) {
635 status = -ENOMEM;
636 goto err_buf;
637 }
638
639 usb_set_serial_data(serial, serial_priv);
640
641 status = qt2_setup_urbs(serial);
642 if (status != 0)
643 goto attach_failed;
644
645 return 0;
646
647 attach_failed:
648 kfree(serial_priv->read_buffer);
649 err_buf:
650 kfree(serial_priv);
651 return status;
652 }
653
654 static int qt2_port_probe(struct usb_serial_port *port)
655 {
656 struct usb_serial *serial = port->serial;
657 struct qt2_port_private *port_priv;
658 u8 bEndpointAddress;
659
660 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
661 if (!port_priv)
662 return -ENOMEM;
663
664 spin_lock_init(&port_priv->lock);
665 spin_lock_init(&port_priv->urb_lock);
666 port_priv->port = port;
667
668 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
669 if (!port_priv->write_buffer)
670 goto err_buf;
671
672 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
673 if (!port_priv->write_urb)
674 goto err_urb;
675
676 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
677 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
678 usb_sndbulkpipe(serial->dev, bEndpointAddress),
679 port_priv->write_buffer,
680 QT2_WRITE_BUFFER_SIZE,
681 qt2_write_bulk_callback, port);
682
683 usb_set_serial_port_data(port, port_priv);
684
685 return 0;
686 err_urb:
687 kfree(port_priv->write_buffer);
688 err_buf:
689 kfree(port_priv);
690 return -ENOMEM;
691 }
692
693 static void qt2_port_remove(struct usb_serial_port *port)
694 {
695 struct qt2_port_private *port_priv;
696
697 port_priv = usb_get_serial_port_data(port);
698 usb_free_urb(port_priv->write_urb);
699 kfree(port_priv->write_buffer);
700 kfree(port_priv);
701 }
702
703 static int qt2_tiocmget(struct tty_struct *tty)
704 {
705 struct usb_serial_port *port = tty->driver_data;
706 struct usb_device *dev = port->serial->dev;
707 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
708 u8 *d;
709 int r;
710
711 d = kzalloc(2, GFP_KERNEL);
712 if (!d)
713 return -ENOMEM;
714
715 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
716 if (r < 0)
717 goto mget_out;
718
719 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
720 if (r < 0)
721 goto mget_out;
722
723 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
724 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
725 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
726 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
727 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
728 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
729
730 mget_out:
731 kfree(d);
732 return r;
733 }
734
735 static int qt2_tiocmset(struct tty_struct *tty,
736 unsigned int set, unsigned int clear)
737 {
738 struct qt2_port_private *port_priv;
739
740 port_priv = usb_get_serial_port_data(tty->driver_data);
741 return update_mctrl(port_priv, set, clear);
742 }
743
744 static int qt2_break_ctl(struct tty_struct *tty, int break_state)
745 {
746 struct usb_serial_port *port = tty->driver_data;
747 struct qt2_port_private *port_priv;
748 int status;
749 u16 val;
750
751 port_priv = usb_get_serial_port_data(port);
752
753 val = (break_state == -1) ? 1 : 0;
754
755 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
756 val, port_priv->device_port);
757 if (status < 0) {
758 dev_warn(&port->dev,
759 "%s - failed to send control message: %i\n", __func__,
760 status);
761 return status;
762 }
763
764 return 0;
765 }
766
767
768
769 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
770 {
771 struct usb_device *dev = port->serial->dev;
772 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
773
774 /* Disable flow control */
775 if (!on) {
776 if (qt2_setregister(dev, port_priv->device_port,
777 UART_MCR, 0) < 0)
778 dev_warn(&port->dev, "error from flowcontrol urb\n");
779 }
780 /* drop RTS and DTR */
781 if (on)
782 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
783 else
784 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
785 }
786
787 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
788 {
789 struct qt2_port_private *port_priv;
790 u8 newMSR = (u8) *ch;
791 unsigned long flags;
792
793 /* May be called from qt2_process_read_urb() for an unbound port. */
794 port_priv = usb_get_serial_port_data(port);
795 if (!port_priv)
796 return;
797
798 spin_lock_irqsave(&port_priv->lock, flags);
799 port_priv->shadowMSR = newMSR;
800 spin_unlock_irqrestore(&port_priv->lock, flags);
801
802 if (newMSR & UART_MSR_ANY_DELTA) {
803 /* update input line counters */
804 if (newMSR & UART_MSR_DCTS)
805 port->icount.cts++;
806 if (newMSR & UART_MSR_DDSR)
807 port->icount.dsr++;
808 if (newMSR & UART_MSR_DDCD)
809 port->icount.dcd++;
810 if (newMSR & UART_MSR_TERI)
811 port->icount.rng++;
812
813 wake_up_interruptible(&port->port.delta_msr_wait);
814 }
815 }
816
817 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
818 {
819 struct qt2_port_private *port_priv;
820 struct async_icount *icount;
821 unsigned long flags;
822 u8 newLSR = (u8) *ch;
823
824 /* May be called from qt2_process_read_urb() for an unbound port. */
825 port_priv = usb_get_serial_port_data(port);
826 if (!port_priv)
827 return;
828
829 if (newLSR & UART_LSR_BI)
830 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
831
832 spin_lock_irqsave(&port_priv->lock, flags);
833 port_priv->shadowLSR = newLSR;
834 spin_unlock_irqrestore(&port_priv->lock, flags);
835
836 icount = &port->icount;
837
838 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
839
840 if (newLSR & UART_LSR_BI)
841 icount->brk++;
842
843 if (newLSR & UART_LSR_OE)
844 icount->overrun++;
845
846 if (newLSR & UART_LSR_PE)
847 icount->parity++;
848
849 if (newLSR & UART_LSR_FE)
850 icount->frame++;
851 }
852
853 }
854
855 static unsigned int qt2_write_room(struct tty_struct *tty)
856 {
857 struct usb_serial_port *port = tty->driver_data;
858 struct qt2_port_private *port_priv;
859 unsigned long flags;
860 unsigned int r;
861
862 port_priv = usb_get_serial_port_data(port);
863
864 spin_lock_irqsave(&port_priv->urb_lock, flags);
865
866 if (port_priv->urb_in_use)
867 r = 0;
868 else
869 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
870
871 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
872
873 return r;
874 }
875
876 static int qt2_write(struct tty_struct *tty,
877 struct usb_serial_port *port,
878 const unsigned char *buf, int count)
879 {
880 struct qt2_port_private *port_priv;
881 struct urb *write_urb;
882 unsigned char *data;
883 unsigned long flags;
884 int status;
885 int bytes_out = 0;
886
887 port_priv = usb_get_serial_port_data(port);
888
889 if (port_priv->write_urb == NULL) {
890 dev_err(&port->dev, "%s - no output urb\n", __func__);
891 return 0;
892 }
893 write_urb = port_priv->write_urb;
894
895 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
896
897 data = write_urb->transfer_buffer;
898 spin_lock_irqsave(&port_priv->urb_lock, flags);
899 if (port_priv->urb_in_use) {
900 dev_err(&port->dev, "qt2_write - urb is in use\n");
901 goto write_out;
902 }
903
904 *data++ = QT2_CONTROL_BYTE;
905 *data++ = QT2_CONTROL_BYTE;
906 *data++ = port_priv->device_port;
907 put_unaligned_le16(count, data);
908 data += 2;
909 memcpy(data, buf, count);
910
911 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
912
913 status = usb_submit_urb(write_urb, GFP_ATOMIC);
914 if (status == 0) {
915 port_priv->urb_in_use = true;
916 bytes_out += count;
917 }
918
919 write_out:
920 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
921 return bytes_out;
922 }
923
924
925 static struct usb_serial_driver qt2_device = {
926 .driver = {
927 .name = "quatech-serial",
928 },
929 .description = DRIVER_DESC,
930 .id_table = id_table,
931 .open = qt2_open,
932 .close = qt2_close,
933 .write = qt2_write,
934 .write_room = qt2_write_room,
935 .calc_num_ports = qt2_calc_num_ports,
936 .attach = qt2_attach,
937 .release = qt2_release,
938 .disconnect = qt2_disconnect,
939 .port_probe = qt2_port_probe,
940 .port_remove = qt2_port_remove,
941 .dtr_rts = qt2_dtr_rts,
942 .break_ctl = qt2_break_ctl,
943 .tiocmget = qt2_tiocmget,
944 .tiocmset = qt2_tiocmset,
945 .tiocmiwait = usb_serial_generic_tiocmiwait,
946 .get_icount = usb_serial_generic_get_icount,
947 .set_termios = qt2_set_termios,
948 };
949
950 static struct usb_serial_driver *const serial_drivers[] = {
951 &qt2_device, NULL
952 };
953
954 module_usb_serial_driver(serial_drivers, id_table);
955
956 MODULE_DESCRIPTION(DRIVER_DESC);
957 MODULE_LICENSE("GPL v2");
Kernel DRM miscellaneous fixes and cross-tree changes