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USB: ftdi_sio: PID for NZR SEM 16+ USB
[mirror_ubuntu-bionic-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 static bool debug;
31
32 /* default urb timeout for usb operations */
33 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
34
35 #define QT_OPEN_CLOSE_CHANNEL 0xca
36 #define QT_SET_GET_DEVICE 0xc2
37 #define QT_SET_GET_REGISTER 0xc0
38 #define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
39 #define QT_SET_ATF 0xcd
40 #define QT_TRANSFER_IN 0xc0
41 #define QT_HW_FLOW_CONTROL_MASK 0xc5
42 #define QT_SW_FLOW_CONTROL_MASK 0xc6
43 #define QT2_BREAK_CONTROL 0xc8
44 #define QT2_GET_SET_UART 0xc1
45 #define QT2_FLUSH_DEVICE 0xc4
46 #define QT2_GET_SET_QMCR 0xe1
47 #define QT2_QMCR_RS232 0x40
48 #define QT2_QMCR_RS422 0x10
49
50 #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
51
52 #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR)
53
54 /* status bytes for the device */
55 #define QT2_CONTROL_BYTE 0x1b
56 #define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */
57 #define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */
58 #define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */
59 #define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */
60 #define QT2_REC_FLUSH 0x04 /* no following info */
61 #define QT2_XMIT_FLUSH 0x05 /* no following info */
62 #define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */
63
64 #define MAX_BAUD_RATE 921600
65 #define DEFAULT_BAUD_RATE 9600
66
67 #define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */
68 #define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */
69
70 /* Version Information */
71 #define DRIVER_VERSION "v0.1"
72 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
73
74 #define USB_VENDOR_ID_QUATECH 0x061d
75 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */
76 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */
77 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */
78 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */
79 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */
80 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */
81 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */
82
83 struct qt2_device_detail {
84 int product_id;
85 int num_ports;
86 };
87
88 #define QT_DETAILS(prod, ports) \
89 .product_id = (prod), \
90 .num_ports = (ports)
91
92 static const struct qt2_device_detail qt2_device_details[] = {
93 {QT_DETAILS(QUATECH_SSU2_100, 1)},
94 {QT_DETAILS(QUATECH_DSU2_400, 2)},
95 {QT_DETAILS(QUATECH_DSU2_100, 2)},
96 {QT_DETAILS(QUATECH_QSU2_400, 4)},
97 {QT_DETAILS(QUATECH_QSU2_100, 4)},
98 {QT_DETAILS(QUATECH_ESU2_400, 8)},
99 {QT_DETAILS(QUATECH_ESU2_100, 8)},
100 {QT_DETAILS(0, 0)} /* Terminating entry */
101 };
102
103 static const struct usb_device_id id_table[] = {
104 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
105 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
106 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
107 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
108 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
109 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
110 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
111 {} /* Terminating entry */
112 };
113 MODULE_DEVICE_TABLE(usb, id_table);
114
115 struct qt2_serial_private {
116 unsigned char current_port; /* current port for incoming data */
117
118 struct urb *read_urb; /* shared among all ports */
119 char read_buffer[512];
120 };
121
122 struct qt2_port_private {
123 bool is_open;
124 u8 device_port;
125
126 spinlock_t urb_lock;
127 bool urb_in_use;
128 struct urb *write_urb;
129 char write_buffer[QT2_WRITE_BUFFER_SIZE];
130
131 spinlock_t lock;
132 u8 shadowLSR;
133 u8 shadowMSR;
134
135 wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
136 struct async_icount icount;
137
138 struct usb_serial_port *port;
139 };
140
141 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
142 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
143 static void qt2_write_bulk_callback(struct urb *urb);
144 static void qt2_read_bulk_callback(struct urb *urb);
145
146 static void qt2_release(struct usb_serial *serial)
147 {
148 int i;
149
150 kfree(usb_get_serial_data(serial));
151
152 for (i = 0; i < serial->num_ports; i++)
153 kfree(usb_get_serial_port_data(serial->port[i]));
154 }
155
156 static inline int calc_baud_divisor(int baudrate)
157 {
158 int divisor, rem;
159
160 divisor = MAX_BAUD_RATE / baudrate;
161 rem = MAX_BAUD_RATE % baudrate;
162 /* Round to nearest divisor */
163 if (((rem * 2) >= baudrate) && (baudrate != 110))
164 divisor++;
165
166 return divisor;
167 }
168
169 static inline int qt2_set_port_config(struct usb_device *dev,
170 unsigned char port_number,
171 u16 baudrate, u16 lcr)
172 {
173 int divisor = calc_baud_divisor(baudrate);
174 u16 index = ((u16) (lcr << 8) | (u16) (port_number));
175
176 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
177 QT2_GET_SET_UART, 0x40,
178 divisor, index, NULL, 0, QT2_USB_TIMEOUT);
179 }
180
181 static inline int qt2_control_msg(struct usb_device *dev,
182 u8 request, u16 data, u16 index)
183 {
184 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
185 request, 0x40, data, index,
186 NULL, 0, QT2_USB_TIMEOUT);
187 }
188
189 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
190 {
191 u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
192
193 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
194 }
195
196
197 static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
198 {
199 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
200 QT_SET_GET_DEVICE, 0xc0, 0, 0,
201 data, 3, QT2_USB_TIMEOUT);
202 }
203
204 static inline int qt2_getregister(struct usb_device *dev,
205 u8 uart,
206 u8 reg,
207 u8 *data)
208 {
209 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
210 QT_SET_GET_REGISTER, 0xc0, reg,
211 uart, data, sizeof(*data), QT2_USB_TIMEOUT);
212
213 }
214
215 static inline int qt2_setregister(struct usb_device *dev,
216 u8 uart, u8 reg, u16 data)
217 {
218 u16 value = (data << 8) | reg;
219
220 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
221 QT_SET_GET_REGISTER, 0x40, value, uart,
222 NULL, 0, QT2_USB_TIMEOUT);
223 }
224
225 static inline int update_mctrl(struct qt2_port_private *port_priv,
226 unsigned int set, unsigned int clear)
227 {
228 struct usb_serial_port *port = port_priv->port;
229 struct usb_device *dev = port->serial->dev;
230 unsigned urb_value;
231 int status;
232
233 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
234 dev_dbg(&port->dev,
235 "update_mctrl - DTR|RTS not being set|cleared\n");
236 return 0; /* no change */
237 }
238
239 clear &= ~set; /* 'set' takes precedence over 'clear' */
240 urb_value = 0;
241 if (set & TIOCM_DTR)
242 urb_value |= UART_MCR_DTR;
243 if (set & TIOCM_RTS)
244 urb_value |= UART_MCR_RTS;
245
246 status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
247 urb_value);
248 if (status < 0)
249 dev_err(&port->dev,
250 "update_mctrl - Error from MODEM_CTRL urb: %i\n",
251 status);
252 return status;
253 }
254
255 static int qt2_calc_num_ports(struct usb_serial *serial)
256 {
257 struct qt2_device_detail d;
258 int i;
259
260 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
261 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
262 return d.num_ports;
263 }
264
265 /* we didn't recognize the device */
266 dev_err(&serial->dev->dev,
267 "don't know the number of ports, assuming 1\n");
268
269 return 1;
270 }
271
272 static void qt2_set_termios(struct tty_struct *tty,
273 struct usb_serial_port *port,
274 struct ktermios *old_termios)
275 {
276 struct usb_device *dev = port->serial->dev;
277 struct qt2_port_private *port_priv;
278 struct ktermios *termios = tty->termios;
279 u16 baud;
280 unsigned int cflag = termios->c_cflag;
281 u16 new_lcr = 0;
282 int status;
283
284 port_priv = usb_get_serial_port_data(port);
285
286 if (cflag & PARENB) {
287 if (cflag & PARODD)
288 new_lcr |= UART_LCR_PARITY;
289 else
290 new_lcr |= SERIAL_EVEN_PARITY;
291 }
292
293 switch (cflag & CSIZE) {
294 case CS5:
295 new_lcr |= UART_LCR_WLEN5;
296 break;
297 case CS6:
298 new_lcr |= UART_LCR_WLEN6;
299 break;
300 case CS7:
301 new_lcr |= UART_LCR_WLEN7;
302 break;
303 default:
304 case CS8:
305 new_lcr |= UART_LCR_WLEN8;
306 break;
307 }
308
309 baud = tty_get_baud_rate(tty);
310 if (!baud)
311 baud = 9600;
312
313 status = qt2_set_port_config(dev, port_priv->device_port, baud,
314 new_lcr);
315 if (status < 0)
316 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
317 __func__, status);
318
319 if (cflag & CRTSCTS)
320 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
321 SERIAL_CRTSCTS,
322 port_priv->device_port);
323 else
324 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
325 0, port_priv->device_port);
326 if (status < 0)
327 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
328 __func__, status);
329
330 if (I_IXOFF(tty) || I_IXON(tty)) {
331 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
332
333 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
334 x, port_priv->device_port);
335 } else
336 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
337 0, port_priv->device_port);
338
339 if (status < 0)
340 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
341 __func__, status);
342
343 }
344
345 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
346 {
347 struct usb_serial *serial;
348 struct qt2_port_private *port_priv;
349 u8 *data;
350 u16 device_port;
351 int status;
352 unsigned long flags;
353
354 device_port = (u16) (port->number - port->serial->minor);
355
356 serial = port->serial;
357
358 port_priv = usb_get_serial_port_data(port);
359
360 /* set the port to RS232 mode */
361 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
362 QT2_QMCR_RS232, device_port);
363 if (status < 0) {
364 dev_err(&port->dev,
365 "%s failed to set RS232 mode for port %i error %i\n",
366 __func__, device_port, status);
367 return status;
368 }
369
370 data = kzalloc(2, GFP_KERNEL);
371 if (!data)
372 return -ENOMEM;
373
374 /* open the port */
375 status = usb_control_msg(serial->dev,
376 usb_rcvctrlpipe(serial->dev, 0),
377 QT_OPEN_CLOSE_CHANNEL,
378 0xc0, 0,
379 device_port, data, 2, QT2_USB_TIMEOUT);
380
381 if (status < 0) {
382 dev_err(&port->dev, "%s - open port failed %i", __func__,
383 status);
384 kfree(data);
385 return status;
386 }
387
388 spin_lock_irqsave(&port_priv->lock, flags);
389 port_priv->shadowLSR = data[0];
390 port_priv->shadowMSR = data[1];
391 spin_unlock_irqrestore(&port_priv->lock, flags);
392
393 kfree(data);
394
395 /* set to default speed and 8bit word size */
396 status = qt2_set_port_config(serial->dev, device_port,
397 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
398 if (status < 0) {
399 dev_err(&port->dev,
400 "%s - initial setup failed for port %i (%i)\n",
401 __func__, port->number, device_port);
402 return status;
403 }
404
405 port_priv->is_open = true;
406 port_priv->device_port = (u8) device_port;
407
408 if (tty)
409 qt2_set_termios(tty, port, tty->termios);
410
411 return 0;
412
413 }
414
415 static void qt2_close(struct usb_serial_port *port)
416 {
417 struct usb_serial *serial;
418 struct qt2_port_private *port_priv;
419 unsigned long flags;
420 int i;
421
422 serial = port->serial;
423 port_priv = usb_get_serial_port_data(port);
424
425 port_priv->is_open = false;
426
427 spin_lock_irqsave(&port_priv->urb_lock, flags);
428 if (port_priv->write_urb->status == -EINPROGRESS)
429 usb_kill_urb(port_priv->write_urb);
430 port_priv->urb_in_use = false;
431 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
432
433 /* flush the port transmit buffer */
434 i = usb_control_msg(serial->dev,
435 usb_rcvctrlpipe(serial->dev, 0),
436 QT2_FLUSH_DEVICE, 0x40, 1,
437 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
438
439 if (i < 0)
440 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
441 __func__, i);
442
443 /* flush the port receive buffer */
444 i = usb_control_msg(serial->dev,
445 usb_rcvctrlpipe(serial->dev, 0),
446 QT2_FLUSH_DEVICE, 0x40, 0,
447 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
448
449 if (i < 0)
450 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
451 __func__, i);
452
453 /* close the port */
454 i = usb_control_msg(serial->dev,
455 usb_sndctrlpipe(serial->dev, 0),
456 QT_OPEN_CLOSE_CHANNEL,
457 0x40, 0,
458 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
459
460 if (i < 0)
461 dev_err(&port->dev, "%s - close port failed %i\n",
462 __func__, i);
463
464 }
465
466 static void qt2_disconnect(struct usb_serial *serial)
467 {
468 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
469 struct qt2_port_private *port_priv;
470 int i;
471
472 if (serial_priv->read_urb->status == -EINPROGRESS)
473 usb_kill_urb(serial_priv->read_urb);
474
475 usb_free_urb(serial_priv->read_urb);
476
477 for (i = 0; i < serial->num_ports; i++) {
478 port_priv = usb_get_serial_port_data(serial->port[i]);
479
480 if (port_priv->write_urb->status == -EINPROGRESS)
481 usb_kill_urb(port_priv->write_urb);
482 usb_free_urb(port_priv->write_urb);
483 }
484 }
485
486 static int get_serial_info(struct usb_serial_port *port,
487 struct serial_struct __user *retinfo)
488 {
489 struct serial_struct tmp;
490
491 if (!retinfo)
492 return -EFAULT;
493
494 memset(&tmp, 0, sizeof(tmp));
495 tmp.line = port->serial->minor;
496 tmp.port = 0;
497 tmp.irq = 0;
498 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
499 tmp.xmit_fifo_size = port->bulk_out_size;
500 tmp.baud_base = 9600;
501 tmp.close_delay = 5*HZ;
502 tmp.closing_wait = 30*HZ;
503
504 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
505 return -EFAULT;
506 return 0;
507 }
508
509 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
510 {
511 struct qt2_port_private *priv = usb_get_serial_port_data(port);
512 struct async_icount prev, cur;
513 unsigned long flags;
514
515 spin_lock_irqsave(&priv->lock, flags);
516 prev = priv->icount;
517 spin_unlock_irqrestore(&priv->lock, flags);
518
519 while (1) {
520 wait_event_interruptible(priv->delta_msr_wait,
521 ((priv->icount.rng != prev.rng) ||
522 (priv->icount.dsr != prev.dsr) ||
523 (priv->icount.dcd != prev.dcd) ||
524 (priv->icount.cts != prev.cts)));
525
526 if (signal_pending(current))
527 return -ERESTARTSYS;
528
529 spin_lock_irqsave(&priv->lock, flags);
530 cur = priv->icount;
531 spin_unlock_irqrestore(&priv->lock, flags);
532
533 if ((prev.rng == cur.rng) &&
534 (prev.dsr == cur.dsr) &&
535 (prev.dcd == cur.dcd) &&
536 (prev.cts == cur.cts))
537 return -EIO;
538
539 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
540 (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
541 (arg & TIOCM_CD && (prev.dcd != cur.dcd)) ||
542 (arg & TIOCM_CTS && (prev.cts != cur.cts)))
543 return 0;
544 }
545 return 0;
546 }
547
548 static int qt2_get_icount(struct tty_struct *tty,
549 struct serial_icounter_struct *icount)
550 {
551 struct usb_serial_port *port = tty->driver_data;
552 struct qt2_port_private *priv = usb_get_serial_port_data(port);
553 struct async_icount cnow = priv->icount;
554
555 icount->cts = cnow.cts;
556 icount->dsr = cnow.dsr;
557 icount->rng = cnow.rng;
558 icount->dcd = cnow.dcd;
559 icount->rx = cnow.rx;
560 icount->tx = cnow.tx;
561 icount->frame = cnow.frame;
562 icount->overrun = cnow.overrun;
563 icount->parity = cnow.parity;
564 icount->brk = cnow.brk;
565 icount->buf_overrun = cnow.buf_overrun;
566
567 return 0;
568 }
569
570 static int qt2_ioctl(struct tty_struct *tty,
571 unsigned int cmd, unsigned long arg)
572 {
573 struct usb_serial_port *port = tty->driver_data;
574
575 switch (cmd) {
576 case TIOCGSERIAL:
577 return get_serial_info(port,
578 (struct serial_struct __user *)arg);
579
580 case TIOCMIWAIT:
581 return wait_modem_info(port, arg);
582
583 default:
584 break;
585 }
586
587 return -ENOIOCTLCMD;
588 }
589
590 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
591 {
592 switch (*ch) {
593 case QT2_LINE_STATUS:
594 qt2_update_lsr(port, ch + 1);
595 break;
596 case QT2_MODEM_STATUS:
597 qt2_update_msr(port, ch + 1);
598 break;
599 }
600 }
601
602 /* not needed, kept to document functionality */
603 static void qt2_process_xmit_empty(struct usb_serial_port *port,
604 unsigned char *ch)
605 {
606 int bytes_written;
607
608 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
609 }
610
611 /* not needed, kept to document functionality */
612 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
613 {
614 return;
615 }
616
617 void qt2_process_read_urb(struct urb *urb)
618 {
619 struct usb_serial *serial;
620 struct qt2_serial_private *serial_priv;
621 struct usb_serial_port *port;
622 struct qt2_port_private *port_priv;
623 struct tty_struct *tty;
624 bool escapeflag;
625 unsigned char *ch;
626 int i;
627 unsigned char newport;
628 int len = urb->actual_length;
629
630 if (!len)
631 return;
632
633 ch = urb->transfer_buffer;
634 tty = NULL;
635 serial = urb->context;
636 serial_priv = usb_get_serial_data(serial);
637 port = serial->port[serial_priv->current_port];
638 port_priv = usb_get_serial_port_data(port);
639
640 if (port_priv->is_open)
641 tty = tty_port_tty_get(&port->port);
642
643 for (i = 0; i < urb->actual_length; i++) {
644 ch = (unsigned char *)urb->transfer_buffer + i;
645 if ((i <= (len - 3)) &&
646 (*ch == QT2_CONTROL_BYTE) &&
647 (*(ch + 1) == QT2_CONTROL_BYTE)) {
648 escapeflag = false;
649 switch (*(ch + 2)) {
650 case QT2_LINE_STATUS:
651 case QT2_MODEM_STATUS:
652 if (i > (len - 4)) {
653 dev_warn(&port->dev,
654 "%s - status message too short\n",
655 __func__);
656 break;
657 }
658 qt2_process_status(port, ch + 2);
659 i += 3;
660 escapeflag = true;
661 break;
662 case QT2_XMIT_HOLD:
663 if (i > (len - 5)) {
664 dev_warn(&port->dev,
665 "%s - xmit_empty message too short\n",
666 __func__);
667 break;
668 }
669 qt2_process_xmit_empty(port, ch + 3);
670 i += 4;
671 escapeflag = true;
672 break;
673 case QT2_CHANGE_PORT:
674 if (i > (len - 4)) {
675 dev_warn(&port->dev,
676 "%s - change_port message too short\n",
677 __func__);
678 break;
679 }
680 if (tty) {
681 tty_flip_buffer_push(tty);
682 tty_kref_put(tty);
683 }
684
685 newport = *(ch + 3);
686
687 if (newport > serial->num_ports) {
688 dev_err(&port->dev,
689 "%s - port change to invalid port: %i\n",
690 __func__, newport);
691 break;
692 }
693
694 serial_priv->current_port = newport;
695 port = serial->port[serial_priv->current_port];
696 port_priv = usb_get_serial_port_data(port);
697 if (port_priv->is_open)
698 tty = tty_port_tty_get(&port->port);
699 else
700 tty = NULL;
701 i += 3;
702 escapeflag = true;
703 break;
704 case QT2_REC_FLUSH:
705 case QT2_XMIT_FLUSH:
706 qt2_process_flush(port, ch + 2);
707 i += 2;
708 escapeflag = true;
709 break;
710 case QT2_CONTROL_ESCAPE:
711 tty_buffer_request_room(tty, 2);
712 tty_insert_flip_string(tty, ch, 2);
713 i += 2;
714 escapeflag = true;
715 break;
716 default:
717 dev_warn(&port->dev,
718 "%s - unsupported command %i\n",
719 __func__, *(ch + 2));
720 break;
721 }
722 if (escapeflag)
723 continue;
724 }
725
726 if (tty) {
727 tty_buffer_request_room(tty, 1);
728 tty_insert_flip_string(tty, ch, 1);
729 }
730 }
731
732 if (tty) {
733 tty_flip_buffer_push(tty);
734 tty_kref_put(tty);
735 }
736 }
737
738 static void qt2_write_bulk_callback(struct urb *urb)
739 {
740 struct usb_serial_port *port;
741 struct qt2_port_private *port_priv;
742
743 port = urb->context;
744 port_priv = usb_get_serial_port_data(port);
745
746 spin_lock(&port_priv->urb_lock);
747
748 port_priv->urb_in_use = false;
749 usb_serial_port_softint(port);
750
751 spin_unlock(&port_priv->urb_lock);
752
753 }
754
755 static void qt2_read_bulk_callback(struct urb *urb)
756 {
757 struct usb_serial *serial = urb->context;
758 int status;
759
760 if (urb->status) {
761 dev_warn(&serial->dev->dev,
762 "%s - non-zero urb status: %i\n", __func__,
763 urb->status);
764 return;
765 }
766
767 qt2_process_read_urb(urb);
768
769 status = usb_submit_urb(urb, GFP_ATOMIC);
770 if (status != 0)
771 dev_err(&serial->dev->dev,
772 "%s - resubmit read urb failed: %i\n",
773 __func__, status);
774 }
775
776 static int qt2_setup_urbs(struct usb_serial *serial)
777 {
778 struct usb_serial_port *port;
779 struct usb_serial_port *port0;
780 struct qt2_serial_private *serial_priv;
781 struct qt2_port_private *port_priv;
782 int pcount, status;
783
784 port0 = serial->port[0];
785
786 serial_priv = usb_get_serial_data(serial);
787 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
788 if (!serial_priv->read_urb) {
789 dev_err(&serial->dev->dev, "No free urbs available\n");
790 return -ENOMEM;
791 }
792
793 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
794 usb_rcvbulkpipe(serial->dev,
795 port0->bulk_in_endpointAddress),
796 serial_priv->read_buffer,
797 sizeof(serial_priv->read_buffer),
798 qt2_read_bulk_callback, serial);
799
800 /* setup write_urb for each port */
801 for (pcount = 0; pcount < serial->num_ports; pcount++) {
802
803 port = serial->port[pcount];
804 port_priv = usb_get_serial_port_data(port);
805
806 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
807 if (!port_priv->write_urb) {
808 dev_err(&serial->dev->dev,
809 "failed to alloc write_urb for port %i\n",
810 pcount);
811 return -ENOMEM;
812 }
813
814 usb_fill_bulk_urb(port_priv->write_urb,
815 serial->dev,
816 usb_sndbulkpipe(serial->dev,
817 port0->
818 bulk_out_endpointAddress),
819 port_priv->write_buffer,
820 sizeof(port_priv->write_buffer),
821 qt2_write_bulk_callback, port);
822 }
823
824 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
825 if (status != 0) {
826 dev_err(&serial->dev->dev,
827 "%s - submit read urb failed %i\n", __func__, status);
828 return status;
829 }
830
831 return 0;
832
833 }
834
835 static int qt2_attach(struct usb_serial *serial)
836 {
837 struct qt2_serial_private *serial_priv;
838 struct qt2_port_private *port_priv;
839 int status, pcount;
840
841 /* power on unit */
842 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
843 0xc2, 0x40, 0x8000, 0, NULL, 0,
844 QT2_USB_TIMEOUT);
845 if (status < 0) {
846 dev_err(&serial->dev->dev,
847 "%s - failed to power on unit: %i\n", __func__, status);
848 return status;
849 }
850
851 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
852 if (!serial_priv) {
853 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
854 return -ENOMEM;
855 }
856
857 usb_set_serial_data(serial, serial_priv);
858
859 for (pcount = 0; pcount < serial->num_ports; pcount++) {
860 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
861 if (!port_priv) {
862 dev_err(&serial->dev->dev,
863 "%s- kmalloc(%Zd) failed.\n", __func__,
864 sizeof(*port_priv));
865 pcount--;
866 status = -ENOMEM;
867 goto attach_failed;
868 }
869
870 spin_lock_init(&port_priv->lock);
871 spin_lock_init(&port_priv->urb_lock);
872 init_waitqueue_head(&port_priv->delta_msr_wait);
873
874 port_priv->port = serial->port[pcount];
875
876 usb_set_serial_port_data(serial->port[pcount], port_priv);
877 }
878
879 status = qt2_setup_urbs(serial);
880 if (status != 0)
881 goto attach_failed;
882
883 return 0;
884
885 attach_failed:
886 for (/* empty */; pcount >= 0; pcount--) {
887 port_priv = usb_get_serial_port_data(serial->port[pcount]);
888 kfree(port_priv);
889 }
890 kfree(serial_priv);
891 return status;
892 }
893
894 static int qt2_tiocmget(struct tty_struct *tty)
895 {
896 struct usb_serial_port *port = tty->driver_data;
897 struct usb_device *dev = port->serial->dev;
898 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
899 u8 *d;
900 int r;
901
902 d = kzalloc(2, GFP_KERNEL);
903 if (!d)
904 return -ENOMEM;
905
906 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
907 if (r < 0)
908 goto mget_out;
909
910 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
911 if (r < 0)
912 goto mget_out;
913
914 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
915 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
916 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
917 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
918 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
919 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
920
921 mget_out:
922 kfree(d);
923 return r;
924 }
925
926 static int qt2_tiocmset(struct tty_struct *tty,
927 unsigned int set, unsigned int clear)
928 {
929 struct qt2_port_private *port_priv;
930
931 port_priv = usb_get_serial_port_data(tty->driver_data);
932 return update_mctrl(port_priv, set, clear);
933 }
934
935 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
936 {
937 struct usb_serial_port *port = tty->driver_data;
938 struct qt2_port_private *port_priv;
939 int status;
940 u16 val;
941
942 port_priv = usb_get_serial_port_data(port);
943
944 if (!port_priv->is_open) {
945 dev_err(&port->dev,
946 "%s - port is not open\n", __func__);
947 return;
948 }
949
950 val = (break_state == -1) ? 1 : 0;
951
952 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
953 val, port_priv->device_port);
954 if (status < 0)
955 dev_warn(&port->dev,
956 "%s - failed to send control message: %i\n", __func__,
957 status);
958 }
959
960
961
962 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
963 {
964 struct usb_device *dev = port->serial->dev;
965 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
966
967 mutex_lock(&port->serial->disc_mutex);
968 if (!port->serial->disconnected) {
969 /* Disable flow control */
970 if (!on && qt2_setregister(dev, port_priv->device_port,
971 UART_MCR, 0) < 0)
972 dev_warn(&port->dev, "error from flowcontrol urb\n");
973 /* drop RTS and DTR */
974 if (on)
975 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
976 else
977 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
978 }
979 mutex_unlock(&port->serial->disc_mutex);
980 }
981
982 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
983 {
984 struct qt2_port_private *port_priv;
985 u8 newMSR = (u8) *ch;
986 unsigned long flags;
987
988 port_priv = usb_get_serial_port_data(port);
989
990 spin_lock_irqsave(&port_priv->lock, flags);
991 port_priv->shadowMSR = newMSR;
992 spin_unlock_irqrestore(&port_priv->lock, flags);
993
994 if (newMSR & UART_MSR_ANY_DELTA) {
995 /* update input line counters */
996 if (newMSR & UART_MSR_DCTS)
997 port_priv->icount.cts++;
998
999 if (newMSR & UART_MSR_DDSR)
1000 port_priv->icount.dsr++;
1001
1002 if (newMSR & UART_MSR_DDCD)
1003 port_priv->icount.dcd++;
1004
1005 if (newMSR & UART_MSR_TERI)
1006 port_priv->icount.rng++;
1007
1008 wake_up_interruptible(&port_priv->delta_msr_wait);
1009 }
1010 }
1011
1012 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
1013 {
1014 struct qt2_port_private *port_priv;
1015 struct async_icount *icount;
1016 unsigned long flags;
1017 u8 newLSR = (u8) *ch;
1018
1019 port_priv = usb_get_serial_port_data(port);
1020
1021 if (newLSR & UART_LSR_BI)
1022 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
1023
1024 spin_lock_irqsave(&port_priv->lock, flags);
1025 port_priv->shadowLSR = newLSR;
1026 spin_unlock_irqrestore(&port_priv->lock, flags);
1027
1028 icount = &port_priv->icount;
1029
1030 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
1031
1032 if (newLSR & UART_LSR_BI)
1033 icount->brk++;
1034
1035 if (newLSR & UART_LSR_OE)
1036 icount->overrun++;
1037
1038 if (newLSR & UART_LSR_PE)
1039 icount->parity++;
1040
1041 if (newLSR & UART_LSR_FE)
1042 icount->frame++;
1043 }
1044
1045 }
1046
1047 static int qt2_write_room(struct tty_struct *tty)
1048 {
1049 struct usb_serial_port *port = tty->driver_data;
1050 struct qt2_port_private *port_priv;
1051 unsigned long flags = 0;
1052 int r;
1053
1054 port_priv = usb_get_serial_port_data(port);
1055
1056 spin_lock_irqsave(&port_priv->urb_lock, flags);
1057
1058 if (port_priv->urb_in_use)
1059 r = 0;
1060 else
1061 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
1062
1063 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1064
1065 return r;
1066 }
1067
1068 static int qt2_write(struct tty_struct *tty,
1069 struct usb_serial_port *port,
1070 const unsigned char *buf, int count)
1071 {
1072 struct qt2_port_private *port_priv;
1073 struct urb *write_urb;
1074 unsigned char *data;
1075 unsigned long flags;
1076 int status;
1077 int bytes_out = 0;
1078
1079 port_priv = usb_get_serial_port_data(port);
1080
1081 if (port_priv->write_urb == NULL) {
1082 dev_err(&port->dev, "%s - no output urb\n", __func__);
1083 return 0;
1084 }
1085 write_urb = port_priv->write_urb;
1086
1087 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
1088
1089 data = write_urb->transfer_buffer;
1090 spin_lock_irqsave(&port_priv->urb_lock, flags);
1091 if (port_priv->urb_in_use == true) {
1092 printk(KERN_INFO "qt2_write - urb is in use\n");
1093 goto write_out;
1094 }
1095
1096 *data++ = QT2_CONTROL_BYTE;
1097 *data++ = QT2_CONTROL_BYTE;
1098 *data++ = port_priv->device_port;
1099 put_unaligned_le16(count, data);
1100 data += 2;
1101 memcpy(data, buf, count);
1102
1103 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
1104
1105 status = usb_submit_urb(write_urb, GFP_ATOMIC);
1106 if (status == 0) {
1107 port_priv->urb_in_use = true;
1108 bytes_out += count;
1109 }
1110
1111 write_out:
1112 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1113 return bytes_out;
1114 }
1115
1116
1117 static struct usb_serial_driver qt2_device = {
1118 .driver = {
1119 .owner = THIS_MODULE,
1120 .name = "quatech-serial",
1121 },
1122 .description = DRIVER_DESC,
1123 .id_table = id_table,
1124 .open = qt2_open,
1125 .close = qt2_close,
1126 .write = qt2_write,
1127 .write_room = qt2_write_room,
1128 .calc_num_ports = qt2_calc_num_ports,
1129 .attach = qt2_attach,
1130 .release = qt2_release,
1131 .disconnect = qt2_disconnect,
1132 .dtr_rts = qt2_dtr_rts,
1133 .break_ctl = qt2_break_ctl,
1134 .tiocmget = qt2_tiocmget,
1135 .tiocmset = qt2_tiocmset,
1136 .get_icount = qt2_get_icount,
1137 .ioctl = qt2_ioctl,
1138 .set_termios = qt2_set_termios,
1139 };
1140
1141 static struct usb_serial_driver *const serial_drivers[] = {
1142 &qt2_device, NULL
1143 };
1144
1145 module_usb_serial_driver(serial_drivers, id_table);
1146
1147 MODULE_DESCRIPTION(DRIVER_DESC);
1148 MODULE_LICENSE("GPL");
1149
1150 module_param(debug, bool, S_IRUGO | S_IWUSR);
1151 MODULE_PARM_DESC(debug, "Debug enabled or not");
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