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[mirror_ubuntu-hirsute-kernel.git] / drivers / usb / serial / quatech2.c
1 /*
2 * usb-serial driver for Quatech USB 2 devices
3 *
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 *
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
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
65 #define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */
66 #define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */
67
68 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
69
70 #define USB_VENDOR_ID_QUATECH 0x061d
71 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */
72 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */
73 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */
74 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */
75 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */
76 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */
77 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */
78
79 struct qt2_device_detail {
80 int product_id;
81 int num_ports;
82 };
83
84 #define QT_DETAILS(prod, ports) \
85 .product_id = (prod), \
86 .num_ports = (ports)
87
88 static const struct qt2_device_detail qt2_device_details[] = {
89 {QT_DETAILS(QUATECH_SSU2_100, 1)},
90 {QT_DETAILS(QUATECH_DSU2_400, 2)},
91 {QT_DETAILS(QUATECH_DSU2_100, 2)},
92 {QT_DETAILS(QUATECH_QSU2_400, 4)},
93 {QT_DETAILS(QUATECH_QSU2_100, 4)},
94 {QT_DETAILS(QUATECH_ESU2_400, 8)},
95 {QT_DETAILS(QUATECH_ESU2_100, 8)},
96 {QT_DETAILS(0, 0)} /* Terminating entry */
97 };
98
99 static const struct usb_device_id id_table[] = {
100 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
101 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
102 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
103 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
104 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
105 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
106 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
107 {} /* Terminating entry */
108 };
109 MODULE_DEVICE_TABLE(usb, id_table);
110
111 struct qt2_serial_private {
112 unsigned char current_port; /* current port for incoming data */
113
114 struct urb *read_urb; /* shared among all ports */
115 char read_buffer[512];
116 };
117
118 struct qt2_port_private {
119 bool is_open;
120 u8 device_port;
121
122 spinlock_t urb_lock;
123 bool urb_in_use;
124 struct urb *write_urb;
125 char write_buffer[QT2_WRITE_BUFFER_SIZE];
126
127 spinlock_t lock;
128 u8 shadowLSR;
129 u8 shadowMSR;
130
131 wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
132 struct async_icount icount;
133
134 struct usb_serial_port *port;
135 };
136
137 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
138 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
139 static void qt2_write_bulk_callback(struct urb *urb);
140 static void qt2_read_bulk_callback(struct urb *urb);
141
142 static void qt2_release(struct usb_serial *serial)
143 {
144 struct qt2_serial_private *serial_priv;
145
146 serial_priv = usb_get_serial_data(serial);
147
148 usb_free_urb(serial_priv->read_urb);
149 kfree(serial_priv);
150 }
151
152 static inline int calc_baud_divisor(int baudrate)
153 {
154 int divisor, rem;
155
156 divisor = MAX_BAUD_RATE / baudrate;
157 rem = MAX_BAUD_RATE % baudrate;
158 /* Round to nearest divisor */
159 if (((rem * 2) >= baudrate) && (baudrate != 110))
160 divisor++;
161
162 return divisor;
163 }
164
165 static inline int qt2_set_port_config(struct usb_device *dev,
166 unsigned char port_number,
167 u16 baudrate, u16 lcr)
168 {
169 int divisor = calc_baud_divisor(baudrate);
170 u16 index = ((u16) (lcr << 8) | (u16) (port_number));
171
172 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
173 QT2_GET_SET_UART, 0x40,
174 divisor, index, NULL, 0, QT2_USB_TIMEOUT);
175 }
176
177 static inline int qt2_control_msg(struct usb_device *dev,
178 u8 request, u16 data, u16 index)
179 {
180 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
181 request, 0x40, data, index,
182 NULL, 0, QT2_USB_TIMEOUT);
183 }
184
185 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
186 {
187 u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
188
189 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
190 }
191
192
193 static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
194 {
195 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
196 QT_SET_GET_DEVICE, 0xc0, 0, 0,
197 data, 3, QT2_USB_TIMEOUT);
198 }
199
200 static inline int qt2_getregister(struct usb_device *dev,
201 u8 uart,
202 u8 reg,
203 u8 *data)
204 {
205 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
206 QT_SET_GET_REGISTER, 0xc0, reg,
207 uart, data, sizeof(*data), QT2_USB_TIMEOUT);
208
209 }
210
211 static inline int qt2_setregister(struct usb_device *dev,
212 u8 uart, u8 reg, u16 data)
213 {
214 u16 value = (data << 8) | reg;
215
216 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
217 QT_SET_GET_REGISTER, 0x40, value, uart,
218 NULL, 0, QT2_USB_TIMEOUT);
219 }
220
221 static inline int update_mctrl(struct qt2_port_private *port_priv,
222 unsigned int set, unsigned int clear)
223 {
224 struct usb_serial_port *port = port_priv->port;
225 struct usb_device *dev = port->serial->dev;
226 unsigned urb_value;
227 int status;
228
229 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
230 dev_dbg(&port->dev,
231 "update_mctrl - DTR|RTS not being set|cleared\n");
232 return 0; /* no change */
233 }
234
235 clear &= ~set; /* 'set' takes precedence over 'clear' */
236 urb_value = 0;
237 if (set & TIOCM_DTR)
238 urb_value |= UART_MCR_DTR;
239 if (set & TIOCM_RTS)
240 urb_value |= UART_MCR_RTS;
241
242 status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
243 urb_value);
244 if (status < 0)
245 dev_err(&port->dev,
246 "update_mctrl - Error from MODEM_CTRL urb: %i\n",
247 status);
248 return status;
249 }
250
251 static int qt2_calc_num_ports(struct usb_serial *serial)
252 {
253 struct qt2_device_detail d;
254 int i;
255
256 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
257 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
258 return d.num_ports;
259 }
260
261 /* we didn't recognize the device */
262 dev_err(&serial->dev->dev,
263 "don't know the number of ports, assuming 1\n");
264
265 return 1;
266 }
267
268 static void qt2_set_termios(struct tty_struct *tty,
269 struct usb_serial_port *port,
270 struct ktermios *old_termios)
271 {
272 struct usb_device *dev = port->serial->dev;
273 struct qt2_port_private *port_priv;
274 struct ktermios *termios = &tty->termios;
275 u16 baud;
276 unsigned int cflag = termios->c_cflag;
277 u16 new_lcr = 0;
278 int status;
279
280 port_priv = usb_get_serial_port_data(port);
281
282 if (cflag & PARENB) {
283 if (cflag & PARODD)
284 new_lcr |= UART_LCR_PARITY;
285 else
286 new_lcr |= SERIAL_EVEN_PARITY;
287 }
288
289 switch (cflag & CSIZE) {
290 case CS5:
291 new_lcr |= UART_LCR_WLEN5;
292 break;
293 case CS6:
294 new_lcr |= UART_LCR_WLEN6;
295 break;
296 case CS7:
297 new_lcr |= UART_LCR_WLEN7;
298 break;
299 default:
300 case CS8:
301 new_lcr |= UART_LCR_WLEN8;
302 break;
303 }
304
305 baud = tty_get_baud_rate(tty);
306 if (!baud)
307 baud = 9600;
308
309 status = qt2_set_port_config(dev, port_priv->device_port, baud,
310 new_lcr);
311 if (status < 0)
312 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
313 __func__, status);
314
315 if (cflag & CRTSCTS)
316 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
317 SERIAL_CRTSCTS,
318 port_priv->device_port);
319 else
320 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
321 0, port_priv->device_port);
322 if (status < 0)
323 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
324 __func__, status);
325
326 if (I_IXOFF(tty) || I_IXON(tty)) {
327 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
328
329 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
330 x, port_priv->device_port);
331 } else
332 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
333 0, port_priv->device_port);
334
335 if (status < 0)
336 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
337 __func__, status);
338
339 }
340
341 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
342 {
343 struct usb_serial *serial;
344 struct qt2_port_private *port_priv;
345 u8 *data;
346 u16 device_port;
347 int status;
348 unsigned long flags;
349
350 device_port = (u16) (port->number - port->serial->minor);
351
352 serial = port->serial;
353
354 port_priv = usb_get_serial_port_data(port);
355
356 /* set the port to RS232 mode */
357 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
358 QT2_QMCR_RS232, device_port);
359 if (status < 0) {
360 dev_err(&port->dev,
361 "%s failed to set RS232 mode for port %i error %i\n",
362 __func__, device_port, status);
363 return status;
364 }
365
366 data = kzalloc(2, GFP_KERNEL);
367 if (!data)
368 return -ENOMEM;
369
370 /* open the port */
371 status = usb_control_msg(serial->dev,
372 usb_rcvctrlpipe(serial->dev, 0),
373 QT_OPEN_CLOSE_CHANNEL,
374 0xc0, 0,
375 device_port, data, 2, QT2_USB_TIMEOUT);
376
377 if (status < 0) {
378 dev_err(&port->dev, "%s - open port failed %i", __func__,
379 status);
380 kfree(data);
381 return status;
382 }
383
384 spin_lock_irqsave(&port_priv->lock, flags);
385 port_priv->shadowLSR = data[0];
386 port_priv->shadowMSR = data[1];
387 spin_unlock_irqrestore(&port_priv->lock, flags);
388
389 kfree(data);
390
391 /* set to default speed and 8bit word size */
392 status = qt2_set_port_config(serial->dev, device_port,
393 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
394 if (status < 0) {
395 dev_err(&port->dev,
396 "%s - initial setup failed for port %i (%i)\n",
397 __func__, port->number, device_port);
398 return status;
399 }
400
401 port_priv->is_open = true;
402 port_priv->device_port = (u8) device_port;
403
404 if (tty)
405 qt2_set_termios(tty, port, &tty->termios);
406
407 return 0;
408
409 }
410
411 static void qt2_close(struct usb_serial_port *port)
412 {
413 struct usb_serial *serial;
414 struct qt2_port_private *port_priv;
415 unsigned long flags;
416 int i;
417
418 serial = port->serial;
419 port_priv = usb_get_serial_port_data(port);
420
421 port_priv->is_open = false;
422
423 spin_lock_irqsave(&port_priv->urb_lock, flags);
424 usb_kill_urb(port_priv->write_urb);
425 port_priv->urb_in_use = false;
426 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
427
428 mutex_lock(&port->serial->disc_mutex);
429 if (port->serial->disconnected) {
430 mutex_unlock(&port->serial->disc_mutex);
431 return;
432 }
433
434 /* flush the port transmit buffer */
435 i = usb_control_msg(serial->dev,
436 usb_rcvctrlpipe(serial->dev, 0),
437 QT2_FLUSH_DEVICE, 0x40, 1,
438 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
439
440 if (i < 0)
441 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
442 __func__, i);
443
444 /* flush the port receive buffer */
445 i = usb_control_msg(serial->dev,
446 usb_rcvctrlpipe(serial->dev, 0),
447 QT2_FLUSH_DEVICE, 0x40, 0,
448 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
449
450 if (i < 0)
451 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
452 __func__, i);
453
454 /* close the port */
455 i = usb_control_msg(serial->dev,
456 usb_sndctrlpipe(serial->dev, 0),
457 QT_OPEN_CLOSE_CHANNEL,
458 0x40, 0,
459 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
460
461 if (i < 0)
462 dev_err(&port->dev, "%s - close port failed %i\n",
463 __func__, i);
464
465 mutex_unlock(&port->serial->disc_mutex);
466 }
467
468 static void qt2_disconnect(struct usb_serial *serial)
469 {
470 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
471
472 usb_kill_urb(serial_priv->read_urb);
473 }
474
475 static int get_serial_info(struct usb_serial_port *port,
476 struct serial_struct __user *retinfo)
477 {
478 struct serial_struct tmp;
479
480 if (!retinfo)
481 return -EFAULT;
482
483 memset(&tmp, 0, sizeof(tmp));
484 tmp.line = port->serial->minor;
485 tmp.port = 0;
486 tmp.irq = 0;
487 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
488 tmp.xmit_fifo_size = port->bulk_out_size;
489 tmp.baud_base = 9600;
490 tmp.close_delay = 5*HZ;
491 tmp.closing_wait = 30*HZ;
492
493 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
494 return -EFAULT;
495 return 0;
496 }
497
498 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
499 {
500 struct qt2_port_private *priv = usb_get_serial_port_data(port);
501 struct async_icount prev, cur;
502 unsigned long flags;
503
504 spin_lock_irqsave(&priv->lock, flags);
505 prev = priv->icount;
506 spin_unlock_irqrestore(&priv->lock, flags);
507
508 while (1) {
509 wait_event_interruptible(priv->delta_msr_wait,
510 ((priv->icount.rng != prev.rng) ||
511 (priv->icount.dsr != prev.dsr) ||
512 (priv->icount.dcd != prev.dcd) ||
513 (priv->icount.cts != prev.cts)));
514
515 if (signal_pending(current))
516 return -ERESTARTSYS;
517
518 spin_lock_irqsave(&priv->lock, flags);
519 cur = priv->icount;
520 spin_unlock_irqrestore(&priv->lock, flags);
521
522 if ((prev.rng == cur.rng) &&
523 (prev.dsr == cur.dsr) &&
524 (prev.dcd == cur.dcd) &&
525 (prev.cts == cur.cts))
526 return -EIO;
527
528 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
529 (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
530 (arg & TIOCM_CD && (prev.dcd != cur.dcd)) ||
531 (arg & TIOCM_CTS && (prev.cts != cur.cts)))
532 return 0;
533 }
534 return 0;
535 }
536
537 static int qt2_get_icount(struct tty_struct *tty,
538 struct serial_icounter_struct *icount)
539 {
540 struct usb_serial_port *port = tty->driver_data;
541 struct qt2_port_private *priv = usb_get_serial_port_data(port);
542 struct async_icount cnow = priv->icount;
543
544 icount->cts = cnow.cts;
545 icount->dsr = cnow.dsr;
546 icount->rng = cnow.rng;
547 icount->dcd = cnow.dcd;
548 icount->rx = cnow.rx;
549 icount->tx = cnow.tx;
550 icount->frame = cnow.frame;
551 icount->overrun = cnow.overrun;
552 icount->parity = cnow.parity;
553 icount->brk = cnow.brk;
554 icount->buf_overrun = cnow.buf_overrun;
555
556 return 0;
557 }
558
559 static int qt2_ioctl(struct tty_struct *tty,
560 unsigned int cmd, unsigned long arg)
561 {
562 struct usb_serial_port *port = tty->driver_data;
563
564 switch (cmd) {
565 case TIOCGSERIAL:
566 return get_serial_info(port,
567 (struct serial_struct __user *)arg);
568
569 case TIOCMIWAIT:
570 return wait_modem_info(port, arg);
571
572 default:
573 break;
574 }
575
576 return -ENOIOCTLCMD;
577 }
578
579 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
580 {
581 switch (*ch) {
582 case QT2_LINE_STATUS:
583 qt2_update_lsr(port, ch + 1);
584 break;
585 case QT2_MODEM_STATUS:
586 qt2_update_msr(port, ch + 1);
587 break;
588 }
589 }
590
591 /* not needed, kept to document functionality */
592 static void qt2_process_xmit_empty(struct usb_serial_port *port,
593 unsigned char *ch)
594 {
595 int bytes_written;
596
597 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
598 }
599
600 /* not needed, kept to document functionality */
601 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
602 {
603 return;
604 }
605
606 void qt2_process_read_urb(struct urb *urb)
607 {
608 struct usb_serial *serial;
609 struct qt2_serial_private *serial_priv;
610 struct usb_serial_port *port;
611 struct qt2_port_private *port_priv;
612 bool escapeflag;
613 unsigned char *ch;
614 int i;
615 unsigned char newport;
616 int len = urb->actual_length;
617
618 if (!len)
619 return;
620
621 ch = urb->transfer_buffer;
622 serial = urb->context;
623 serial_priv = usb_get_serial_data(serial);
624 port = serial->port[serial_priv->current_port];
625 port_priv = usb_get_serial_port_data(port);
626
627 for (i = 0; i < urb->actual_length; i++) {
628 ch = (unsigned char *)urb->transfer_buffer + i;
629 if ((i <= (len - 3)) &&
630 (*ch == QT2_CONTROL_BYTE) &&
631 (*(ch + 1) == QT2_CONTROL_BYTE)) {
632 escapeflag = false;
633 switch (*(ch + 2)) {
634 case QT2_LINE_STATUS:
635 case QT2_MODEM_STATUS:
636 if (i > (len - 4)) {
637 dev_warn(&port->dev,
638 "%s - status message too short\n",
639 __func__);
640 break;
641 }
642 qt2_process_status(port, ch + 2);
643 i += 3;
644 escapeflag = true;
645 break;
646 case QT2_XMIT_HOLD:
647 if (i > (len - 5)) {
648 dev_warn(&port->dev,
649 "%s - xmit_empty message too short\n",
650 __func__);
651 break;
652 }
653 qt2_process_xmit_empty(port, ch + 3);
654 i += 4;
655 escapeflag = true;
656 break;
657 case QT2_CHANGE_PORT:
658 if (i > (len - 4)) {
659 dev_warn(&port->dev,
660 "%s - change_port message too short\n",
661 __func__);
662 break;
663 }
664 tty_flip_buffer_push(&port->port);
665
666 newport = *(ch + 3);
667
668 if (newport > serial->num_ports) {
669 dev_err(&port->dev,
670 "%s - port change to invalid port: %i\n",
671 __func__, newport);
672 break;
673 }
674
675 serial_priv->current_port = newport;
676 port = serial->port[serial_priv->current_port];
677 port_priv = usb_get_serial_port_data(port);
678 i += 3;
679 escapeflag = true;
680 break;
681 case QT2_REC_FLUSH:
682 case QT2_XMIT_FLUSH:
683 qt2_process_flush(port, ch + 2);
684 i += 2;
685 escapeflag = true;
686 break;
687 case QT2_CONTROL_ESCAPE:
688 tty_buffer_request_room(&port->port, 2);
689 tty_insert_flip_string(&port->port, ch, 2);
690 i += 2;
691 escapeflag = true;
692 break;
693 default:
694 dev_warn(&port->dev,
695 "%s - unsupported command %i\n",
696 __func__, *(ch + 2));
697 break;
698 }
699 if (escapeflag)
700 continue;
701 }
702
703 tty_buffer_request_room(&port->port, 1);
704 tty_insert_flip_string(&port->port, ch, 1);
705 }
706
707 tty_flip_buffer_push(&port->port);
708 }
709
710 static void qt2_write_bulk_callback(struct urb *urb)
711 {
712 struct usb_serial_port *port;
713 struct qt2_port_private *port_priv;
714
715 port = urb->context;
716 port_priv = usb_get_serial_port_data(port);
717
718 spin_lock(&port_priv->urb_lock);
719
720 port_priv->urb_in_use = false;
721 usb_serial_port_softint(port);
722
723 spin_unlock(&port_priv->urb_lock);
724
725 }
726
727 static void qt2_read_bulk_callback(struct urb *urb)
728 {
729 struct usb_serial *serial = urb->context;
730 int status;
731
732 if (urb->status) {
733 dev_warn(&serial->dev->dev,
734 "%s - non-zero urb status: %i\n", __func__,
735 urb->status);
736 return;
737 }
738
739 qt2_process_read_urb(urb);
740
741 status = usb_submit_urb(urb, GFP_ATOMIC);
742 if (status != 0)
743 dev_err(&serial->dev->dev,
744 "%s - resubmit read urb failed: %i\n",
745 __func__, status);
746 }
747
748 static int qt2_setup_urbs(struct usb_serial *serial)
749 {
750 struct usb_serial_port *port0;
751 struct qt2_serial_private *serial_priv;
752 int status;
753
754 port0 = serial->port[0];
755
756 serial_priv = usb_get_serial_data(serial);
757 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
758 if (!serial_priv->read_urb) {
759 dev_err(&serial->dev->dev, "No free urbs available\n");
760 return -ENOMEM;
761 }
762
763 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
764 usb_rcvbulkpipe(serial->dev,
765 port0->bulk_in_endpointAddress),
766 serial_priv->read_buffer,
767 sizeof(serial_priv->read_buffer),
768 qt2_read_bulk_callback, serial);
769
770 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
771 if (status != 0) {
772 dev_err(&serial->dev->dev,
773 "%s - submit read urb failed %i\n", __func__, status);
774 usb_free_urb(serial_priv->read_urb);
775 return status;
776 }
777
778 return 0;
779 }
780
781 static int qt2_attach(struct usb_serial *serial)
782 {
783 struct qt2_serial_private *serial_priv;
784 int status;
785
786 /* power on unit */
787 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
788 0xc2, 0x40, 0x8000, 0, NULL, 0,
789 QT2_USB_TIMEOUT);
790 if (status < 0) {
791 dev_err(&serial->dev->dev,
792 "%s - failed to power on unit: %i\n", __func__, status);
793 return status;
794 }
795
796 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
797 if (!serial_priv) {
798 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
799 return -ENOMEM;
800 }
801
802 usb_set_serial_data(serial, serial_priv);
803
804 status = qt2_setup_urbs(serial);
805 if (status != 0)
806 goto attach_failed;
807
808 return 0;
809
810 attach_failed:
811 kfree(serial_priv);
812 return status;
813 }
814
815 static int qt2_port_probe(struct usb_serial_port *port)
816 {
817 struct usb_serial *serial = port->serial;
818 struct qt2_port_private *port_priv;
819 u8 bEndpointAddress;
820
821 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
822 if (!port_priv)
823 return -ENOMEM;
824
825 spin_lock_init(&port_priv->lock);
826 spin_lock_init(&port_priv->urb_lock);
827 init_waitqueue_head(&port_priv->delta_msr_wait);
828 port_priv->port = port;
829
830 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
831 if (!port_priv->write_urb) {
832 kfree(port_priv);
833 return -ENOMEM;
834 }
835 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
836 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
837 usb_sndbulkpipe(serial->dev, bEndpointAddress),
838 port_priv->write_buffer,
839 sizeof(port_priv->write_buffer),
840 qt2_write_bulk_callback, port);
841
842 usb_set_serial_port_data(port, port_priv);
843
844 return 0;
845 }
846
847 static int qt2_port_remove(struct usb_serial_port *port)
848 {
849 struct qt2_port_private *port_priv;
850
851 port_priv = usb_get_serial_port_data(port);
852 usb_free_urb(port_priv->write_urb);
853 kfree(port_priv);
854
855 return 0;
856 }
857
858 static int qt2_tiocmget(struct tty_struct *tty)
859 {
860 struct usb_serial_port *port = tty->driver_data;
861 struct usb_device *dev = port->serial->dev;
862 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
863 u8 *d;
864 int r;
865
866 d = kzalloc(2, GFP_KERNEL);
867 if (!d)
868 return -ENOMEM;
869
870 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
871 if (r < 0)
872 goto mget_out;
873
874 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
875 if (r < 0)
876 goto mget_out;
877
878 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
879 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
880 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
881 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
882 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
883 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
884
885 mget_out:
886 kfree(d);
887 return r;
888 }
889
890 static int qt2_tiocmset(struct tty_struct *tty,
891 unsigned int set, unsigned int clear)
892 {
893 struct qt2_port_private *port_priv;
894
895 port_priv = usb_get_serial_port_data(tty->driver_data);
896 return update_mctrl(port_priv, set, clear);
897 }
898
899 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
900 {
901 struct usb_serial_port *port = tty->driver_data;
902 struct qt2_port_private *port_priv;
903 int status;
904 u16 val;
905
906 port_priv = usb_get_serial_port_data(port);
907
908 if (!port_priv->is_open) {
909 dev_err(&port->dev,
910 "%s - port is not open\n", __func__);
911 return;
912 }
913
914 val = (break_state == -1) ? 1 : 0;
915
916 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
917 val, port_priv->device_port);
918 if (status < 0)
919 dev_warn(&port->dev,
920 "%s - failed to send control message: %i\n", __func__,
921 status);
922 }
923
924
925
926 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
927 {
928 struct usb_device *dev = port->serial->dev;
929 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
930
931 mutex_lock(&port->serial->disc_mutex);
932 if (!port->serial->disconnected) {
933 /* Disable flow control */
934 if (!on && qt2_setregister(dev, port_priv->device_port,
935 UART_MCR, 0) < 0)
936 dev_warn(&port->dev, "error from flowcontrol urb\n");
937 /* drop RTS and DTR */
938 if (on)
939 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
940 else
941 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
942 }
943 mutex_unlock(&port->serial->disc_mutex);
944 }
945
946 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
947 {
948 struct qt2_port_private *port_priv;
949 u8 newMSR = (u8) *ch;
950 unsigned long flags;
951
952 port_priv = usb_get_serial_port_data(port);
953
954 spin_lock_irqsave(&port_priv->lock, flags);
955 port_priv->shadowMSR = newMSR;
956 spin_unlock_irqrestore(&port_priv->lock, flags);
957
958 if (newMSR & UART_MSR_ANY_DELTA) {
959 /* update input line counters */
960 if (newMSR & UART_MSR_DCTS)
961 port_priv->icount.cts++;
962
963 if (newMSR & UART_MSR_DDSR)
964 port_priv->icount.dsr++;
965
966 if (newMSR & UART_MSR_DDCD)
967 port_priv->icount.dcd++;
968
969 if (newMSR & UART_MSR_TERI)
970 port_priv->icount.rng++;
971
972 wake_up_interruptible(&port_priv->delta_msr_wait);
973 }
974 }
975
976 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
977 {
978 struct qt2_port_private *port_priv;
979 struct async_icount *icount;
980 unsigned long flags;
981 u8 newLSR = (u8) *ch;
982
983 port_priv = usb_get_serial_port_data(port);
984
985 if (newLSR & UART_LSR_BI)
986 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
987
988 spin_lock_irqsave(&port_priv->lock, flags);
989 port_priv->shadowLSR = newLSR;
990 spin_unlock_irqrestore(&port_priv->lock, flags);
991
992 icount = &port_priv->icount;
993
994 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
995
996 if (newLSR & UART_LSR_BI)
997 icount->brk++;
998
999 if (newLSR & UART_LSR_OE)
1000 icount->overrun++;
1001
1002 if (newLSR & UART_LSR_PE)
1003 icount->parity++;
1004
1005 if (newLSR & UART_LSR_FE)
1006 icount->frame++;
1007 }
1008
1009 }
1010
1011 static int qt2_write_room(struct tty_struct *tty)
1012 {
1013 struct usb_serial_port *port = tty->driver_data;
1014 struct qt2_port_private *port_priv;
1015 unsigned long flags = 0;
1016 int r;
1017
1018 port_priv = usb_get_serial_port_data(port);
1019
1020 spin_lock_irqsave(&port_priv->urb_lock, flags);
1021
1022 if (port_priv->urb_in_use)
1023 r = 0;
1024 else
1025 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
1026
1027 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1028
1029 return r;
1030 }
1031
1032 static int qt2_write(struct tty_struct *tty,
1033 struct usb_serial_port *port,
1034 const unsigned char *buf, int count)
1035 {
1036 struct qt2_port_private *port_priv;
1037 struct urb *write_urb;
1038 unsigned char *data;
1039 unsigned long flags;
1040 int status;
1041 int bytes_out = 0;
1042
1043 port_priv = usb_get_serial_port_data(port);
1044
1045 if (port_priv->write_urb == NULL) {
1046 dev_err(&port->dev, "%s - no output urb\n", __func__);
1047 return 0;
1048 }
1049 write_urb = port_priv->write_urb;
1050
1051 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
1052
1053 data = write_urb->transfer_buffer;
1054 spin_lock_irqsave(&port_priv->urb_lock, flags);
1055 if (port_priv->urb_in_use == true) {
1056 dev_err(&port->dev, "qt2_write - urb is in use\n");
1057 goto write_out;
1058 }
1059
1060 *data++ = QT2_CONTROL_BYTE;
1061 *data++ = QT2_CONTROL_BYTE;
1062 *data++ = port_priv->device_port;
1063 put_unaligned_le16(count, data);
1064 data += 2;
1065 memcpy(data, buf, count);
1066
1067 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
1068
1069 status = usb_submit_urb(write_urb, GFP_ATOMIC);
1070 if (status == 0) {
1071 port_priv->urb_in_use = true;
1072 bytes_out += count;
1073 }
1074
1075 write_out:
1076 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1077 return bytes_out;
1078 }
1079
1080
1081 static struct usb_serial_driver qt2_device = {
1082 .driver = {
1083 .owner = THIS_MODULE,
1084 .name = "quatech-serial",
1085 },
1086 .description = DRIVER_DESC,
1087 .id_table = id_table,
1088 .open = qt2_open,
1089 .close = qt2_close,
1090 .write = qt2_write,
1091 .write_room = qt2_write_room,
1092 .calc_num_ports = qt2_calc_num_ports,
1093 .attach = qt2_attach,
1094 .release = qt2_release,
1095 .disconnect = qt2_disconnect,
1096 .port_probe = qt2_port_probe,
1097 .port_remove = qt2_port_remove,
1098 .dtr_rts = qt2_dtr_rts,
1099 .break_ctl = qt2_break_ctl,
1100 .tiocmget = qt2_tiocmget,
1101 .tiocmset = qt2_tiocmset,
1102 .get_icount = qt2_get_icount,
1103 .ioctl = qt2_ioctl,
1104 .set_termios = qt2_set_termios,
1105 };
1106
1107 static struct usb_serial_driver *const serial_drivers[] = {
1108 &qt2_device, NULL
1109 };
1110
1111 module_usb_serial_driver(serial_drivers, id_table);
1112
1113 MODULE_DESCRIPTION(DRIVER_DESC);
1114 MODULE_LICENSE("GPL");
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