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USB: pl2303: clean up driver somewhat
[mirror_ubuntu-bionic-kernel.git] / drivers / usb / serial / quatech2.c
CommitLineData
f7a33e60
BP		 1/*
2 * usb-serial driver for Quatech USB 2 devices
3 *
f88e6a30
BP		 4 * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
f7a33e60
BP		 10 *
11 * These devices all have only 1 bulk in and 1 bulk out that is shared
12 * for all serial ports.
13 *
14 */
15
16#include <asm/unaligned.h>
17#include <linux/errno.h>
18#include <linux/init.h>
19#include <linux/slab.h>
20#include <linux/tty.h>
21#include <linux/tty_driver.h>
22#include <linux/tty_flip.h>
23#include <linux/module.h>
24#include <linux/serial.h>
25#include <linux/usb.h>
26#include <linux/usb/serial.h>
27#include <linux/serial_reg.h>
28#include <linux/uaccess.h>
29
f7a33e60
BP		 30/* default urb timeout for usb operations */
31#define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
32
33#define QT_OPEN_CLOSE_CHANNEL 0xca
34#define QT_SET_GET_DEVICE 0xc2
35#define QT_SET_GET_REGISTER 0xc0
36#define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
37#define QT_SET_ATF 0xcd
38#define QT_TRANSFER_IN 0xc0
39#define QT_HW_FLOW_CONTROL_MASK 0xc5
40#define QT_SW_FLOW_CONTROL_MASK 0xc6
41#define QT2_BREAK_CONTROL 0xc8
42#define QT2_GET_SET_UART 0xc1
43#define QT2_FLUSH_DEVICE 0xc4
44#define QT2_GET_SET_QMCR 0xe1
45#define QT2_QMCR_RS232 0x40
46#define QT2_QMCR_RS422 0x10
47
48#define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
49
50#define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR)
51
52/* status bytes for the device */
53#define QT2_CONTROL_BYTE 0x1b
54#define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */
55#define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */
56#define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */
57#define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */
58#define QT2_REC_FLUSH 0x04 /* no following info */
59#define QT2_XMIT_FLUSH 0x05 /* no following info */
60#define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */
61
62#define MAX_BAUD_RATE 921600
63#define DEFAULT_BAUD_RATE 9600
64
04480671 65#define QT2_READ_BUFFER_SIZE 512 /* size of read buffer */
f7a33e60
BP		 66#define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */
67#define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */
68
f7a33e60
BP		 69#define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
70
71#define USB_VENDOR_ID_QUATECH 0x061d
72#define QUATECH_SSU2_100 0xC120 /* RS232 single port */
73#define QUATECH_DSU2_100 0xC140 /* RS232 dual port */
74#define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */
75#define QUATECH_QSU2_100 0xC160 /* RS232 four port */
76#define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */
77#define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */
78#define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */
79
80struct qt2_device_detail {
81 int product_id;
82 int num_ports;
83};
84
85#define QT_DETAILS(prod, ports) \
86 .product_id = (prod), \
87 .num_ports = (ports)
88
89static const struct qt2_device_detail qt2_device_details[] = {
90 {QT_DETAILS(QUATECH_SSU2_100, 1)},
91 {QT_DETAILS(QUATECH_DSU2_400, 2)},
92 {QT_DETAILS(QUATECH_DSU2_100, 2)},
93 {QT_DETAILS(QUATECH_QSU2_400, 4)},
94 {QT_DETAILS(QUATECH_QSU2_100, 4)},
95 {QT_DETAILS(QUATECH_ESU2_400, 8)},
96 {QT_DETAILS(QUATECH_ESU2_100, 8)},
97 {QT_DETAILS(0, 0)} /* Terminating entry */
98};
99
100static const struct usb_device_id id_table[] = {
101 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
102 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
103 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
104 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
105 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
106 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
107 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
108 {} /* Terminating entry */
109};
110MODULE_DEVICE_TABLE(usb, id_table);
111
112struct qt2_serial_private {
113 unsigned char current_port; /* current port for incoming data */
114
115 struct urb *read_urb; /* shared among all ports */
04480671 116 char *read_buffer;
f7a33e60
BP		 117};
118
119struct qt2_port_private {
f7a33e60
BP		 120 u8 device_port;
121
122 spinlock_t urb_lock;
123 bool urb_in_use;
124 struct urb *write_urb;
cbf30a91 125 char *write_buffer;
f7a33e60
BP		 126
127 spinlock_t lock;
128 u8 shadowLSR;
129 u8 shadowMSR;
130
f7a33e60
BP		 131 struct usb_serial_port *port;
132};
133
134static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
135static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
136static void qt2_write_bulk_callback(struct urb *urb);
137static void qt2_read_bulk_callback(struct urb *urb);
138
139static void qt2_release(struct usb_serial *serial)
140{
40d04738 141 struct qt2_serial_private *serial_priv;
f7a33e60 142
40d04738 143 serial_priv = usb_get_serial_data(serial);
f7a33e60 144
40d04738 145 usb_free_urb(serial_priv->read_urb);
04480671 146 kfree(serial_priv->read_buffer);
40d04738 147 kfree(serial_priv);
f7a33e60
BP		 148}
149
150static inline int calc_baud_divisor(int baudrate)
151{
152 int divisor, rem;
153
154 divisor = MAX_BAUD_RATE / baudrate;
155 rem = MAX_BAUD_RATE % baudrate;
156 /* Round to nearest divisor */
157 if (((rem * 2) >= baudrate) && (baudrate != 110))
158 divisor++;
159
160 return divisor;
161}
162
163static inline int qt2_set_port_config(struct usb_device *dev,
164 unsigned char port_number,
165 u16 baudrate, u16 lcr)
166{
167 int divisor = calc_baud_divisor(baudrate);
168 u16 index = ((u16) (lcr << 8) | (u16) (port_number));
169
170 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
171 QT2_GET_SET_UART, 0x40,
172 divisor, index, NULL, 0, QT2_USB_TIMEOUT);
173}
174
175static inline int qt2_control_msg(struct usb_device *dev,
176 u8 request, u16 data, u16 index)
177{
178 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
179 request, 0x40, data, index,
180 NULL, 0, QT2_USB_TIMEOUT);
181}
182
183static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
184{
185 u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
186
187 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
188}
189
190
191static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
192{
193 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
194 QT_SET_GET_DEVICE, 0xc0, 0, 0,
195 data, 3, QT2_USB_TIMEOUT);
196}
197
198static inline int qt2_getregister(struct usb_device *dev,
199 u8 uart,
200 u8 reg,
201 u8 *data)
202{
203 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
204 QT_SET_GET_REGISTER, 0xc0, reg,
205 uart, data, sizeof(*data), QT2_USB_TIMEOUT);
206
207}
208
209static inline int qt2_setregister(struct usb_device *dev,
210 u8 uart, u8 reg, u16 data)
211{
212 u16 value = (data << 8) | reg;
213
214 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
215 QT_SET_GET_REGISTER, 0x40, value, uart,
216 NULL, 0, QT2_USB_TIMEOUT);
217}
218
219static inline int update_mctrl(struct qt2_port_private *port_priv,
220 unsigned int set, unsigned int clear)
221{
222 struct usb_serial_port *port = port_priv->port;
223 struct usb_device *dev = port->serial->dev;
224 unsigned urb_value;
225 int status;
226
227 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
228 dev_dbg(&port->dev,
229 "update_mctrl - DTR|RTS not being set|cleared\n");
230 return 0; /* no change */
231 }
232
233 clear &= ~set; /* 'set' takes precedence over 'clear' */
234 urb_value = 0;
235 if (set & TIOCM_DTR)
236 urb_value |= UART_MCR_DTR;
237 if (set & TIOCM_RTS)
238 urb_value |= UART_MCR_RTS;
239
240 status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
241 urb_value);
242 if (status < 0)
243 dev_err(&port->dev,
244 "update_mctrl - Error from MODEM_CTRL urb: %i\n",
245 status);
246 return status;
247}
248
249static int qt2_calc_num_ports(struct usb_serial *serial)
250{
251 struct qt2_device_detail d;
252 int i;
253
254 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
255 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
256 return d.num_ports;
257 }
258
259 /* we didn't recognize the device */
260 dev_err(&serial->dev->dev,
261 "don't know the number of ports, assuming 1\n");
262
263 return 1;
264}
265
266static void qt2_set_termios(struct tty_struct *tty,
267 struct usb_serial_port *port,
268 struct ktermios *old_termios)
269{
270 struct usb_device *dev = port->serial->dev;
271 struct qt2_port_private *port_priv;
adc8d746 272 struct ktermios *termios = &tty->termios;
f7a33e60
BP		 273 u16 baud;
274 unsigned int cflag = termios->c_cflag;
275 u16 new_lcr = 0;
276 int status;
277
278 port_priv = usb_get_serial_port_data(port);
279
280 if (cflag & PARENB) {
281 if (cflag & PARODD)
282 new_lcr |= UART_LCR_PARITY;
283 else
284 new_lcr |= SERIAL_EVEN_PARITY;
285 }
286
287 switch (cflag & CSIZE) {
288 case CS5:
289 new_lcr |= UART_LCR_WLEN5;
290 break;
291 case CS6:
292 new_lcr |= UART_LCR_WLEN6;
293 break;
294 case CS7:
295 new_lcr |= UART_LCR_WLEN7;
296 break;
297 default:
298 case CS8:
299 new_lcr |= UART_LCR_WLEN8;
300 break;
301 }
302
303 baud = tty_get_baud_rate(tty);
304 if (!baud)
305 baud = 9600;
306
307 status = qt2_set_port_config(dev, port_priv->device_port, baud,
308 new_lcr);
309 if (status < 0)
310 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
311 __func__, status);
312
313 if (cflag & CRTSCTS)
314 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
315 SERIAL_CRTSCTS,
316 port_priv->device_port);
317 else
318 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
319 0, port_priv->device_port);
320 if (status < 0)
321 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
322 __func__, status);
323
324 if (I_IXOFF(tty) || I_IXON(tty)) {
325 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
326
327 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
328 x, port_priv->device_port);
329 } else
330 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
331 0, port_priv->device_port);
332
333 if (status < 0)
334 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
335 __func__, status);
336
337}
338
339static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
340{
341 struct usb_serial *serial;
f7a33e60
BP		 342 struct qt2_port_private *port_priv;
343 u8 *data;
344 u16 device_port;
345 int status;
346 unsigned long flags;
347
1143832e 348 device_port = port->port_number;
f7a33e60
BP		 349
350 serial = port->serial;
351
352 port_priv = usb_get_serial_port_data(port);
f7a33e60
BP		 353
354 /* set the port to RS232 mode */
355 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
356 QT2_QMCR_RS232, device_port);
357 if (status < 0) {
358 dev_err(&port->dev,
359 "%s failed to set RS232 mode for port %i error %i\n",
360 __func__, device_port, status);
361 return status;
362 }
363
364 data = kzalloc(2, GFP_KERNEL);
365 if (!data)
366 return -ENOMEM;
367
368 /* open the port */
369 status = usb_control_msg(serial->dev,
370 usb_rcvctrlpipe(serial->dev, 0),
371 QT_OPEN_CLOSE_CHANNEL,
372 0xc0, 0,
373 device_port, data, 2, QT2_USB_TIMEOUT);
374
375 if (status < 0) {
376 dev_err(&port->dev, "%s - open port failed %i", __func__,
377 status);
378 kfree(data);
379 return status;
380 }
381
382 spin_lock_irqsave(&port_priv->lock, flags);
383 port_priv->shadowLSR = data[0];
384 port_priv->shadowMSR = data[1];
385 spin_unlock_irqrestore(&port_priv->lock, flags);
386
387 kfree(data);
388
389 /* set to default speed and 8bit word size */
390 status = qt2_set_port_config(serial->dev, device_port,
391 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
392 if (status < 0) {
1143832e
GKH		 393 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
394 __func__, device_port);
f7a33e60
BP		 395 return status;
396 }
397
f7a33e60
BP		 398 port_priv->device_port = (u8) device_port;
399
400 if (tty)
adc8d746 401 qt2_set_termios(tty, port, &tty->termios);
f7a33e60
BP		 402
403 return 0;
404
405}
406
407static void qt2_close(struct usb_serial_port *port)
408{
409 struct usb_serial *serial;
f7a33e60
BP		 410 struct qt2_port_private *port_priv;
411 unsigned long flags;
412 int i;
413
414 serial = port->serial;
f7a33e60
BP		 415 port_priv = usb_get_serial_port_data(port);
416
f7a33e60 417 spin_lock_irqsave(&port_priv->urb_lock, flags);
8e512ab0 418 usb_kill_urb(port_priv->write_urb);
f7a33e60
BP		 419 port_priv->urb_in_use = false;
420 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
421
422 /* flush the port transmit buffer */
423 i = usb_control_msg(serial->dev,
424 usb_rcvctrlpipe(serial->dev, 0),
425 QT2_FLUSH_DEVICE, 0x40, 1,
426 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
427
428 if (i < 0)
429 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
430 __func__, i);
431
432 /* flush the port receive buffer */
433 i = usb_control_msg(serial->dev,
434 usb_rcvctrlpipe(serial->dev, 0),
435 QT2_FLUSH_DEVICE, 0x40, 0,
436 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
437
438 if (i < 0)
439 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
440 __func__, i);
441
442 /* close the port */
443 i = usb_control_msg(serial->dev,
444 usb_sndctrlpipe(serial->dev, 0),
445 QT_OPEN_CLOSE_CHANNEL,
446 0x40, 0,
447 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
448
449 if (i < 0)
450 dev_err(&port->dev, "%s - close port failed %i\n",
451 __func__, i);
f7a33e60
BP		 452}
453
454static void qt2_disconnect(struct usb_serial *serial)
455{
456 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
f7a33e60 457
8e512ab0 458 usb_kill_urb(serial_priv->read_urb);
f7a33e60
BP		 459}
460
461static int get_serial_info(struct usb_serial_port *port,
462 struct serial_struct __user *retinfo)
463{
464 struct serial_struct tmp;
465
466 if (!retinfo)
467 return -EFAULT;
468
469 memset(&tmp, 0, sizeof(tmp));
e5b1e206 470 tmp.line = port->minor;
f7a33e60
BP		 471 tmp.port = 0;
472 tmp.irq = 0;
473 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
474 tmp.xmit_fifo_size = port->bulk_out_size;
475 tmp.baud_base = 9600;
476 tmp.close_delay = 5*HZ;
477 tmp.closing_wait = 30*HZ;
478
479 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
480 return -EFAULT;
481 return 0;
482}
483
f7a33e60
BP		 484static int qt2_ioctl(struct tty_struct *tty,
485 unsigned int cmd, unsigned long arg)
486{
487 struct usb_serial_port *port = tty->driver_data;
488
489 switch (cmd) {
490 case TIOCGSERIAL:
491 return get_serial_info(port,
492 (struct serial_struct __user *)arg);
f7a33e60
BP		 493 default:
494 break;
495 }
496
497 return -ENOIOCTLCMD;
498}
499
500static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
501{
502 switch (*ch) {
503 case QT2_LINE_STATUS:
504 qt2_update_lsr(port, ch + 1);
505 break;
506 case QT2_MODEM_STATUS:
507 qt2_update_msr(port, ch + 1);
508 break;
509 }
510}
511
512/* not needed, kept to document functionality */
513static void qt2_process_xmit_empty(struct usb_serial_port *port,
514 unsigned char *ch)
515{
516 int bytes_written;
517
518 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
519}
520
521/* not needed, kept to document functionality */
522static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
523{
524 return;
525}
526
0e357899 527static void qt2_process_read_urb(struct urb *urb)
f7a33e60
BP		 528{
529 struct usb_serial *serial;
530 struct qt2_serial_private *serial_priv;
531 struct usb_serial_port *port;
532 struct qt2_port_private *port_priv;
f7a33e60
BP		 533 bool escapeflag;
534 unsigned char *ch;
535 int i;
536 unsigned char newport;
537 int len = urb->actual_length;
538
539 if (!len)
540 return;
541
542 ch = urb->transfer_buffer;
f7a33e60
BP		 543 serial = urb->context;
544 serial_priv = usb_get_serial_data(serial);
545 port = serial->port[serial_priv->current_port];
546 port_priv = usb_get_serial_port_data(port);
547
f7a33e60
BP		 548 for (i = 0; i < urb->actual_length; i++) {
549 ch = (unsigned char *)urb->transfer_buffer + i;
550 if ((i <= (len - 3)) &&
551 (*ch == QT2_CONTROL_BYTE) &&
552 (*(ch + 1) == QT2_CONTROL_BYTE)) {
553 escapeflag = false;
554 switch (*(ch + 2)) {
555 case QT2_LINE_STATUS:
556 case QT2_MODEM_STATUS:
557 if (i > (len - 4)) {
558 dev_warn(&port->dev,
559 "%s - status message too short\n",
560 __func__);
561 break;
562 }
563 qt2_process_status(port, ch + 2);
564 i += 3;
565 escapeflag = true;
566 break;
567 case QT2_XMIT_HOLD:
568 if (i > (len - 5)) {
569 dev_warn(&port->dev,
570 "%s - xmit_empty message too short\n",
571 __func__);
572 break;
573 }
574 qt2_process_xmit_empty(port, ch + 3);
575 i += 4;
576 escapeflag = true;
577 break;
578 case QT2_CHANGE_PORT:
579 if (i > (len - 4)) {
580 dev_warn(&port->dev,
581 "%s - change_port message too short\n",
582 __func__);
583 break;
584 }
2be818a1 585 tty_flip_buffer_push(&port->port);
f7a33e60
BP		 586
587 newport = *(ch + 3);
588
589 if (newport > serial->num_ports) {
590 dev_err(&port->dev,
591 "%s - port change to invalid port: %i\n",
592 __func__, newport);
593 break;
594 }
595
596 serial_priv->current_port = newport;
597 port = serial->port[serial_priv->current_port];
598 port_priv = usb_get_serial_port_data(port);
f7a33e60
BP		 599 i += 3;
600 escapeflag = true;
601 break;
602 case QT2_REC_FLUSH:
603 case QT2_XMIT_FLUSH:
604 qt2_process_flush(port, ch + 2);
605 i += 2;
606 escapeflag = true;
607 break;
608 case QT2_CONTROL_ESCAPE:
227434f8 609 tty_buffer_request_room(&port->port, 2);
05c7cd39 610 tty_insert_flip_string(&port->port, ch, 2);
f7a33e60
BP		 611 i += 2;
612 escapeflag = true;
613 break;
614 default:
615 dev_warn(&port->dev,
616 "%s - unsupported command %i\n",
617 __func__, *(ch + 2));
618 break;
619 }
620 if (escapeflag)
621 continue;
622 }
623
05c7cd39
JS		 624 tty_buffer_request_room(&port->port, 1);
625 tty_insert_flip_string(&port->port, ch, 1);
f7a33e60
BP		 626 }
627
2be818a1 628 tty_flip_buffer_push(&port->port);
f7a33e60
BP		 629}
630
631static void qt2_write_bulk_callback(struct urb *urb)
632{
633 struct usb_serial_port *port;
634 struct qt2_port_private *port_priv;
635
636 port = urb->context;
637 port_priv = usb_get_serial_port_data(port);
638
639 spin_lock(&port_priv->urb_lock);
640
641 port_priv->urb_in_use = false;
642 usb_serial_port_softint(port);
643
644 spin_unlock(&port_priv->urb_lock);
645
646}
647
648static void qt2_read_bulk_callback(struct urb *urb)
649{
650 struct usb_serial *serial = urb->context;
651 int status;
652
653 if (urb->status) {
654 dev_warn(&serial->dev->dev,
655 "%s - non-zero urb status: %i\n", __func__,
656 urb->status);
657 return;
658 }
659
660 qt2_process_read_urb(urb);
661
662 status = usb_submit_urb(urb, GFP_ATOMIC);
663 if (status != 0)
664 dev_err(&serial->dev->dev,
665 "%s - resubmit read urb failed: %i\n",
666 __func__, status);
667}
668
669static int qt2_setup_urbs(struct usb_serial *serial)
670{
f7a33e60
BP		 671 struct usb_serial_port *port0;
672 struct qt2_serial_private *serial_priv;
40d04738 673 int status;
f7a33e60
BP		 674
675 port0 = serial->port[0];
676
677 serial_priv = usb_get_serial_data(serial);
678 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
10c642d0 679 if (!serial_priv->read_urb)
f7a33e60 680 return -ENOMEM;
f7a33e60
BP		 681
682 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
683 usb_rcvbulkpipe(serial->dev,
684 port0->bulk_in_endpointAddress),
685 serial_priv->read_buffer,
04480671 686 QT2_READ_BUFFER_SIZE,
f7a33e60
BP		 687 qt2_read_bulk_callback, serial);
688
f7a33e60
BP		 689 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
690 if (status != 0) {
691 dev_err(&serial->dev->dev,
692 "%s - submit read urb failed %i\n", __func__, status);
b8a00550 693 usb_free_urb(serial_priv->read_urb);
f7a33e60
BP		 694 return status;
695 }
696
697 return 0;
f7a33e60
BP		 698}
699
700static int qt2_attach(struct usb_serial *serial)
701{
702 struct qt2_serial_private *serial_priv;
40d04738 703 int status;
f7a33e60
BP		 704
705 /* power on unit */
706 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
707 0xc2, 0x40, 0x8000, 0, NULL, 0,
708 QT2_USB_TIMEOUT);
709 if (status < 0) {
710 dev_err(&serial->dev->dev,
711 "%s - failed to power on unit: %i\n", __func__, status);
712 return status;
713 }
714
715 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
10c642d0 716 if (!serial_priv)
f7a33e60 717 return -ENOMEM;
f7a33e60 718
04480671
JH		 719 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
720 if (!serial_priv->read_buffer) {
721 status = -ENOMEM;
722 goto err_buf;
723 }
724
f7a33e60
BP		 725 usb_set_serial_data(serial, serial_priv);
726
f7a33e60
BP		 727 status = qt2_setup_urbs(serial);
728 if (status != 0)
729 goto attach_failed;
730
731 return 0;
732
733attach_failed:
04480671
JH		 734 kfree(serial_priv->read_buffer);
735err_buf:
f7a33e60
BP		 736 kfree(serial_priv);
737 return status;
738}
739
40d04738
JH		 740static int qt2_port_probe(struct usb_serial_port *port)
741{
742 struct usb_serial *serial = port->serial;
743 struct qt2_port_private *port_priv;
744 u8 bEndpointAddress;
745
746 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
747 if (!port_priv)
748 return -ENOMEM;
749
750 spin_lock_init(&port_priv->lock);
751 spin_lock_init(&port_priv->urb_lock);
40d04738
JH		 752 port_priv->port = port;
753
cbf30a91
JH		 754 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
755 if (!port_priv->write_buffer)
756 goto err_buf;
757
40d04738 758 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
cbf30a91
JH		 759 if (!port_priv->write_urb)
760 goto err_urb;
761
40d04738
JH		 762 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
763 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
764 usb_sndbulkpipe(serial->dev, bEndpointAddress),
765 port_priv->write_buffer,
cbf30a91 766 QT2_WRITE_BUFFER_SIZE,
40d04738
JH		 767 qt2_write_bulk_callback, port);
768
769 usb_set_serial_port_data(port, port_priv);
770
771 return 0;
cbf30a91
JH		 772err_urb:
773 kfree(port_priv->write_buffer);
774err_buf:
775 kfree(port_priv);
776 return -ENOMEM;
40d04738
JH		 777}
778
779static int qt2_port_remove(struct usb_serial_port *port)
780{
781 struct qt2_port_private *port_priv;
782
783 port_priv = usb_get_serial_port_data(port);
784 usb_free_urb(port_priv->write_urb);
cbf30a91 785 kfree(port_priv->write_buffer);
40d04738
JH		 786 kfree(port_priv);
787
788 return 0;
789}
790
f7a33e60
BP		 791static int qt2_tiocmget(struct tty_struct *tty)
792{
793 struct usb_serial_port *port = tty->driver_data;
794 struct usb_device *dev = port->serial->dev;
795 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
796 u8 *d;
797 int r;
798
799 d = kzalloc(2, GFP_KERNEL);
800 if (!d)
801 return -ENOMEM;
802
803 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
804 if (r < 0)
805 goto mget_out;
806
807 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
808 if (r < 0)
809 goto mget_out;
810
811 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
812 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
813 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
814 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
815 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
816 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
817
818mget_out:
819 kfree(d);
820 return r;
821}
822
823static int qt2_tiocmset(struct tty_struct *tty,
824 unsigned int set, unsigned int clear)
825{
826 struct qt2_port_private *port_priv;
827
828 port_priv = usb_get_serial_port_data(tty->driver_data);
829 return update_mctrl(port_priv, set, clear);
830}
831
832static void qt2_break_ctl(struct tty_struct *tty, int break_state)
833{
834 struct usb_serial_port *port = tty->driver_data;
835 struct qt2_port_private *port_priv;
836 int status;
837 u16 val;
838
839 port_priv = usb_get_serial_port_data(port);
840
f7a33e60
BP		 841 val = (break_state == -1) ? 1 : 0;
842
843 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
844 val, port_priv->device_port);
845 if (status < 0)
846 dev_warn(&port->dev,
847 "%s - failed to send control message: %i\n", __func__,
848 status);
849}
850
851
852
853static void qt2_dtr_rts(struct usb_serial_port *port, int on)
854{
855 struct usb_device *dev = port->serial->dev;
856 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
857
b2ca6990
JH		 858 /* Disable flow control */
859 if (!on) {
860 if (qt2_setregister(dev, port_priv->device_port,
f7a33e60
BP		 861 UART_MCR, 0) < 0)
862 dev_warn(&port->dev, "error from flowcontrol urb\n");
f7a33e60 863 }
b2ca6990
JH		 864 /* drop RTS and DTR */
865 if (on)
866 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
867 else
868 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
f7a33e60
BP		 869}
870
871static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
872{
873 struct qt2_port_private *port_priv;
874 u8 newMSR = (u8) *ch;
875 unsigned long flags;
876
877 port_priv = usb_get_serial_port_data(port);
878
879 spin_lock_irqsave(&port_priv->lock, flags);
880 port_priv->shadowMSR = newMSR;
881 spin_unlock_irqrestore(&port_priv->lock, flags);
882
883 if (newMSR & UART_MSR_ANY_DELTA) {
884 /* update input line counters */
885 if (newMSR & UART_MSR_DCTS)
0a4142fb 886 port->icount.cts++;
f7a33e60 887 if (newMSR & UART_MSR_DDSR)
0a4142fb 888 port->icount.dsr++;
f7a33e60 889 if (newMSR & UART_MSR_DDCD)
0a4142fb 890 port->icount.dcd++;
f7a33e60 891 if (newMSR & UART_MSR_TERI)
0a4142fb 892 port->icount.rng++;
f7a33e60 893
b5959704 894 wake_up_interruptible(&port->port.delta_msr_wait);
f7a33e60
BP		 895 }
896}
897
898static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
899{
900 struct qt2_port_private *port_priv;
901 struct async_icount *icount;
902 unsigned long flags;
903 u8 newLSR = (u8) *ch;
904
905 port_priv = usb_get_serial_port_data(port);
906
907 if (newLSR & UART_LSR_BI)
908 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
909
910 spin_lock_irqsave(&port_priv->lock, flags);
911 port_priv->shadowLSR = newLSR;
912 spin_unlock_irqrestore(&port_priv->lock, flags);
913
0a4142fb 914 icount = &port->icount;
f7a33e60
BP		 915
916 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
917
918 if (newLSR & UART_LSR_BI)
919 icount->brk++;
920
921 if (newLSR & UART_LSR_OE)
922 icount->overrun++;
923
924 if (newLSR & UART_LSR_PE)
925 icount->parity++;
926
927 if (newLSR & UART_LSR_FE)
928 icount->frame++;
929 }
930
931}
932
933static int qt2_write_room(struct tty_struct *tty)
934{
935 struct usb_serial_port *port = tty->driver_data;
936 struct qt2_port_private *port_priv;
937 unsigned long flags = 0;
938 int r;
939
940 port_priv = usb_get_serial_port_data(port);
941
942 spin_lock_irqsave(&port_priv->urb_lock, flags);
943
944 if (port_priv->urb_in_use)
945 r = 0;
946 else
947 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
948
949 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
950
951 return r;
952}
953
954static int qt2_write(struct tty_struct *tty,
955 struct usb_serial_port *port,
956 const unsigned char *buf, int count)
957{
958 struct qt2_port_private *port_priv;
959 struct urb *write_urb;
960 unsigned char *data;
961 unsigned long flags;
962 int status;
963 int bytes_out = 0;
964
965 port_priv = usb_get_serial_port_data(port);
966
967 if (port_priv->write_urb == NULL) {
968 dev_err(&port->dev, "%s - no output urb\n", __func__);
969 return 0;
970 }
971 write_urb = port_priv->write_urb;
972
973 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
974
975 data = write_urb->transfer_buffer;
976 spin_lock_irqsave(&port_priv->urb_lock, flags);
977 if (port_priv->urb_in_use == true) {
788a661a 978 dev_err(&port->dev, "qt2_write - urb is in use\n");
f7a33e60
BP		 979 goto write_out;
980 }
981
982 *data++ = QT2_CONTROL_BYTE;
983 *data++ = QT2_CONTROL_BYTE;
984 *data++ = port_priv->device_port;
985 put_unaligned_le16(count, data);
986 data += 2;
987 memcpy(data, buf, count);
988
989 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
990
991 status = usb_submit_urb(write_urb, GFP_ATOMIC);
992 if (status == 0) {
993 port_priv->urb_in_use = true;
994 bytes_out += count;
995 }
996
997write_out:
998 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
999 return bytes_out;
1000}
1001
1002
1003static struct usb_serial_driver qt2_device = {
1004 .driver = {
1005 .owner = THIS_MODULE,
1006 .name = "quatech-serial",
1007 },
1008 .description = DRIVER_DESC,
1009 .id_table = id_table,
1010 .open = qt2_open,
1011 .close = qt2_close,
1012 .write = qt2_write,
1013 .write_room = qt2_write_room,
1014 .calc_num_ports = qt2_calc_num_ports,
1015 .attach = qt2_attach,
1016 .release = qt2_release,
1017 .disconnect = qt2_disconnect,
40d04738
JH		 1018 .port_probe = qt2_port_probe,
1019 .port_remove = qt2_port_remove,
f7a33e60
BP		 1020 .dtr_rts = qt2_dtr_rts,
1021 .break_ctl = qt2_break_ctl,
1022 .tiocmget = qt2_tiocmget,
1023 .tiocmset = qt2_tiocmset,
b5959704 1024 .tiocmiwait = usb_serial_generic_tiocmiwait,
0a4142fb 1025 .get_icount = usb_serial_generic_get_icount,
f7a33e60
BP		 1026 .ioctl = qt2_ioctl,
1027 .set_termios = qt2_set_termios,
1028};
1029
1030static struct usb_serial_driver *const serial_drivers[] = {
1031 &qt2_device, NULL
1032};
1033
1034module_usb_serial_driver(serial_drivers, id_table);
1035
1036MODULE_DESCRIPTION(DRIVER_DESC);
1037MODULE_LICENSE("GPL");
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