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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
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
53#define QT2_CONTROL_BYTE 0x1b
54#define QT2_LINE_STATUS 0x00
55#define QT2_MODEM_STATUS 0x01
56#define QT2_XMIT_HOLD 0x02
57#define QT2_CHANGE_PORT 0x03
58#define QT2_REC_FLUSH 0x04
59#define QT2_XMIT_FLUSH 0x05
60#define QT2_CONTROL_ESCAPE 0xff
61
62#define MAX_BAUD_RATE 921600
63#define DEFAULT_BAUD_RATE 9600
64
65#define QT2_WRITE_BUFFER_SIZE 512
66#define QT2_WRITE_CONTROL_SIZE 5
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
72#define QUATECH_DSU2_100 0xC140
73#define QUATECH_DSU2_400 0xC150
74#define QUATECH_QSU2_100 0xC160
75#define QUATECH_QSU2_400 0xC170
76#define QUATECH_ESU2_100 0xC1A0
77#define QUATECH_ESU2_400 0xC180
78
79struct 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
88static 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)}
97};
98
99static 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 {}
108};
109MODULE_DEVICE_TABLE(usb, id_table);
110
111struct qt2_serial_private {
112 unsigned char current_port;
113
114 struct urb *read_urb;
115 char read_buffer[512];
116};
117
118struct 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 struct async_icount icount;
132
133 struct usb_serial_port *port;
134};
135
136static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
137static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
138static void qt2_write_bulk_callback(struct urb *urb);
139static void qt2_read_bulk_callback(struct urb *urb);
140
141static void qt2_release(struct usb_serial *serial)
142{
143 struct qt2_serial_private *serial_priv;
144
145 serial_priv = usb_get_serial_data(serial);
146
147 usb_free_urb(serial_priv->read_urb);
148 kfree(serial_priv);
149}
150
151static inline int calc_baud_divisor(int baudrate)
152{
153 int divisor, rem;
154
155 divisor = MAX_BAUD_RATE / baudrate;
156 rem = MAX_BAUD_RATE % baudrate;
157
158 if (((rem * 2) >= baudrate) && (baudrate != 110))
159 divisor++;
160
161 return divisor;
162}
163
164static inline int qt2_set_port_config(struct usb_device *dev,
165 unsigned char port_number,
166 u16 baudrate, u16 lcr)
167{
168 int divisor = calc_baud_divisor(baudrate);
169 u16 index = ((u16) (lcr << 8) | (u16) (port_number));
170
171 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
172 QT2_GET_SET_UART, 0x40,
173 divisor, index, NULL, 0, QT2_USB_TIMEOUT);
174}
175
176static inline int qt2_control_msg(struct usb_device *dev,
177 u8 request, u16 data, u16 index)
178{
179 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
180 request, 0x40, data, index,
181 NULL, 0, QT2_USB_TIMEOUT);
182}
183
184static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
185{
186 u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
187
188 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
189}
190
191
192static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
193{
194 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
195 QT_SET_GET_DEVICE, 0xc0, 0, 0,
196 data, 3, QT2_USB_TIMEOUT);
197}
198
199static inline int qt2_getregister(struct usb_device *dev,
200 u8 uart,
201 u8 reg,
202 u8 *data)
203{
204 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
205 QT_SET_GET_REGISTER, 0xc0, reg,
206 uart, data, sizeof(*data), QT2_USB_TIMEOUT);
207
208}
209
210static inline int qt2_setregister(struct usb_device *dev,
211 u8 uart, u8 reg, u16 data)
212{
213 u16 value = (data << 8) | reg;
214
215 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
216 QT_SET_GET_REGISTER, 0x40, value, uart,
217 NULL, 0, QT2_USB_TIMEOUT);
218}
219
220static inline int update_mctrl(struct qt2_port_private *port_priv,
221 unsigned int set, unsigned int clear)
222{
223 struct usb_serial_port *port = port_priv->port;
224 struct usb_device *dev = port->serial->dev;
225 unsigned urb_value;
226 int status;
227
228 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
229 dev_dbg(&port->dev,
230 "update_mctrl - DTR|RTS not being set|cleared\n");
231 return 0;
232 }
233
234 clear &= ~set;
235 urb_value = 0;
236 if (set & TIOCM_DTR)
237 urb_value |= UART_MCR_DTR;
238 if (set & TIOCM_RTS)
239 urb_value |= UART_MCR_RTS;
240
241 status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
242 urb_value);
243 if (status < 0)
244 dev_err(&port->dev,
245 "update_mctrl - Error from MODEM_CTRL urb: %i\n",
246 status);
247 return status;
248}
249
250static int qt2_calc_num_ports(struct usb_serial *serial)
251{
252 struct qt2_device_detail d;
253 int i;
254
255 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
256 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
257 return d.num_ports;
258 }
259
260
261 dev_err(&serial->dev->dev,
262 "don't know the number of ports, assuming 1\n");
263
264 return 1;
265}
266
267static void qt2_set_termios(struct tty_struct *tty,
268 struct usb_serial_port *port,
269 struct ktermios *old_termios)
270{
271 struct usb_device *dev = port->serial->dev;
272 struct qt2_port_private *port_priv;
273 struct ktermios *termios = &tty->termios;
274 u16 baud;
275 unsigned int cflag = termios->c_cflag;
276 u16 new_lcr = 0;
277 int status;
278
279 port_priv = usb_get_serial_port_data(port);
280
281 if (cflag & PARENB) {
282 if (cflag & PARODD)
283 new_lcr |= UART_LCR_PARITY;
284 else
285 new_lcr |= SERIAL_EVEN_PARITY;
286 }
287
288 switch (cflag & CSIZE) {
289 case CS5:
290 new_lcr |= UART_LCR_WLEN5;
291 break;
292 case CS6:
293 new_lcr |= UART_LCR_WLEN6;
294 break;
295 case CS7:
296 new_lcr |= UART_LCR_WLEN7;
297 break;
298 default:
299 case CS8:
300 new_lcr |= UART_LCR_WLEN8;
301 break;
302 }
303
304 baud = tty_get_baud_rate(tty);
305 if (!baud)
306 baud = 9600;
307
308 status = qt2_set_port_config(dev, port_priv->device_port, baud,
309 new_lcr);
310 if (status < 0)
311 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
312 __func__, status);
313
314 if (cflag & CRTSCTS)
315 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
316 SERIAL_CRTSCTS,
317 port_priv->device_port);
318 else
319 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
320 0, port_priv->device_port);
321 if (status < 0)
322 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
323 __func__, status);
324
325 if (I_IXOFF(tty) || I_IXON(tty)) {
326 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
327
328 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
329 x, port_priv->device_port);
330 } else
331 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
332 0, port_priv->device_port);
333
334 if (status < 0)
335 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
336 __func__, status);
337
338}
339
340static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
341{
342 struct usb_serial *serial;
343 struct qt2_port_private *port_priv;
344 u8 *data;
345 u16 device_port;
346 int status;
347 unsigned long flags;
348
349 device_port = (u16) (port->number - port->serial->minor);
350
351 serial = port->serial;
352
353 port_priv = usb_get_serial_port_data(port);
354
355
356 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
357 QT2_QMCR_RS232, device_port);
358 if (status < 0) {
359 dev_err(&port->dev,
360 "%s failed to set RS232 mode for port %i error %i\n",
361 __func__, device_port, status);
362 return status;
363 }
364
365 data = kzalloc(2, GFP_KERNEL);
366 if (!data)
367 return -ENOMEM;
368
369
370 status = usb_control_msg(serial->dev,
371 usb_rcvctrlpipe(serial->dev, 0),
372 QT_OPEN_CLOSE_CHANNEL,
373 0xc0, 0,
374 device_port, data, 2, QT2_USB_TIMEOUT);
375
376 if (status < 0) {
377 dev_err(&port->dev, "%s - open port failed %i", __func__,
378 status);
379 kfree(data);
380 return status;
381 }
382
383 spin_lock_irqsave(&port_priv->lock, flags);
384 port_priv->shadowLSR = data[0];
385 port_priv->shadowMSR = data[1];
386 spin_unlock_irqrestore(&port_priv->lock, flags);
387
388 kfree(data);
389
390
391 status = qt2_set_port_config(serial->dev, device_port,
392 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
393 if (status < 0) {
394 dev_err(&port->dev,
395 "%s - initial setup failed for port %i (%i)\n",
396 __func__, port->number, device_port);
397 return status;
398 }
399
400 port_priv->is_open = true;
401 port_priv->device_port = (u8) device_port;
402
403 if (tty)
404 qt2_set_termios(tty, port, &tty->termios);
405
406 return 0;
407
408}
409
410static void qt2_close(struct usb_serial_port *port)
411{
412 struct usb_serial *serial;
413 struct qt2_port_private *port_priv;
414 unsigned long flags;
415 int i;
416
417 serial = port->serial;
418 port_priv = usb_get_serial_port_data(port);
419
420 port_priv->is_open = false;
421
422 spin_lock_irqsave(&port_priv->urb_lock, flags);
423 usb_kill_urb(port_priv->write_urb);
424 port_priv->urb_in_use = false;
425 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
426
427 mutex_lock(&port->serial->disc_mutex);
428 if (port->serial->disconnected) {
429 mutex_unlock(&port->serial->disc_mutex);
430 return;
431 }
432
433
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
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
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 mutex_unlock(&port->serial->disc_mutex);
465}
466
467static void qt2_disconnect(struct usb_serial *serial)
468{
469 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
470
471 usb_kill_urb(serial_priv->read_urb);
472}
473
474static int get_serial_info(struct usb_serial_port *port,
475 struct serial_struct __user *retinfo)
476{
477 struct serial_struct tmp;
478
479 if (!retinfo)
480 return -EFAULT;
481
482 memset(&tmp, 0, sizeof(tmp));
483 tmp.line = port->serial->minor;
484 tmp.port = 0;
485 tmp.irq = 0;
486 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
487 tmp.xmit_fifo_size = port->bulk_out_size;
488 tmp.baud_base = 9600;
489 tmp.close_delay = 5*HZ;
490 tmp.closing_wait = 30*HZ;
491
492 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
493 return -EFAULT;
494 return 0;
495}
496
497static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
498{
499 struct qt2_port_private *priv = usb_get_serial_port_data(port);
500 struct async_icount prev, cur;
501 unsigned long flags;
502
503 spin_lock_irqsave(&priv->lock, flags);
504 prev = priv->icount;
505 spin_unlock_irqrestore(&priv->lock, flags);
506
507 while (1) {
508 wait_event_interruptible(port->delta_msr_wait,
509 (port->serial->disconnected ||
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 if (port->serial->disconnected)
519 return -EIO;
520
521 spin_lock_irqsave(&priv->lock, flags);
522 cur = priv->icount;
523 spin_unlock_irqrestore(&priv->lock, flags);
524
525 if ((prev.rng == cur.rng) &&
526 (prev.dsr == cur.dsr) &&
527 (prev.dcd == cur.dcd) &&
528 (prev.cts == cur.cts))
529 return -EIO;
530
531 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
532 (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
533 (arg & TIOCM_CD && (prev.dcd != cur.dcd)) ||
534 (arg & TIOCM_CTS && (prev.cts != cur.cts)))
535 return 0;
536 }
537 return 0;
538}
539
540static int qt2_get_icount(struct tty_struct *tty,
541 struct serial_icounter_struct *icount)
542{
543 struct usb_serial_port *port = tty->driver_data;
544 struct qt2_port_private *priv = usb_get_serial_port_data(port);
545 struct async_icount cnow = priv->icount;
546
547 icount->cts = cnow.cts;
548 icount->dsr = cnow.dsr;
549 icount->rng = cnow.rng;
550 icount->dcd = cnow.dcd;
551 icount->rx = cnow.rx;
552 icount->tx = cnow.tx;
553 icount->frame = cnow.frame;
554 icount->overrun = cnow.overrun;
555 icount->parity = cnow.parity;
556 icount->brk = cnow.brk;
557 icount->buf_overrun = cnow.buf_overrun;
558
559 return 0;
560}
561
562static int qt2_ioctl(struct tty_struct *tty,
563 unsigned int cmd, unsigned long arg)
564{
565 struct usb_serial_port *port = tty->driver_data;
566
567 switch (cmd) {
568 case TIOCGSERIAL:
569 return get_serial_info(port,
570 (struct serial_struct __user *)arg);
571
572 case TIOCMIWAIT:
573 return wait_modem_info(port, arg);
574
575 default:
576 break;
577 }
578
579 return -ENOIOCTLCMD;
580}
581
582static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
583{
584 switch (*ch) {
585 case QT2_LINE_STATUS:
586 qt2_update_lsr(port, ch + 1);
587 break;
588 case QT2_MODEM_STATUS:
589 qt2_update_msr(port, ch + 1);
590 break;
591 }
592}
593
594
595static void qt2_process_xmit_empty(struct usb_serial_port *port,
596 unsigned char *ch)
597{
598 int bytes_written;
599
600 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
601}
602
603
604static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
605{
606 return;
607}
608
609void qt2_process_read_urb(struct urb *urb)
610{
611 struct usb_serial *serial;
612 struct qt2_serial_private *serial_priv;
613 struct usb_serial_port *port;
614 struct qt2_port_private *port_priv;
615 bool escapeflag;
616 unsigned char *ch;
617 int i;
618 unsigned char newport;
619 int len = urb->actual_length;
620
621 if (!len)
622 return;
623
624 ch = urb->transfer_buffer;
625 serial = urb->context;
626 serial_priv = usb_get_serial_data(serial);
627 port = serial->port[serial_priv->current_port];
628 port_priv = usb_get_serial_port_data(port);
629
630 for (i = 0; i < urb->actual_length; i++) {
631 ch = (unsigned char *)urb->transfer_buffer + i;
632 if ((i <= (len - 3)) &&
633 (*ch == QT2_CONTROL_BYTE) &&
634 (*(ch + 1) == QT2_CONTROL_BYTE)) {
635 escapeflag = false;
636 switch (*(ch + 2)) {
637 case QT2_LINE_STATUS:
638 case QT2_MODEM_STATUS:
639 if (i > (len - 4)) {
640 dev_warn(&port->dev,
641 "%s - status message too short\n",
642 __func__);
643 break;
644 }
645 qt2_process_status(port, ch + 2);
646 i += 3;
647 escapeflag = true;
648 break;
649 case QT2_XMIT_HOLD:
650 if (i > (len - 5)) {
651 dev_warn(&port->dev,
652 "%s - xmit_empty message too short\n",
653 __func__);
654 break;
655 }
656 qt2_process_xmit_empty(port, ch + 3);
657 i += 4;
658 escapeflag = true;
659 break;
660 case QT2_CHANGE_PORT:
661 if (i > (len - 4)) {
662 dev_warn(&port->dev,
663 "%s - change_port message too short\n",
664 __func__);
665 break;
666 }
667
668 if (port_priv->is_open)
669 tty_flip_buffer_push(&port->port);
670
671 newport = *(ch + 3);
672
673 if (newport > serial->num_ports) {
674 dev_err(&port->dev,
675 "%s - port change to invalid port: %i\n",
676 __func__, newport);
677 break;
678 }
679
680 serial_priv->current_port = newport;
681 port = serial->port[serial_priv->current_port];
682 port_priv = usb_get_serial_port_data(port);
683 i += 3;
684 escapeflag = true;
685 break;
686 case QT2_REC_FLUSH:
687 case QT2_XMIT_FLUSH:
688 qt2_process_flush(port, ch + 2);
689 i += 2;
690 escapeflag = true;
691 break;
692 case QT2_CONTROL_ESCAPE:
693 tty_buffer_request_room(&port->port, 2);
694 tty_insert_flip_string(&port->port, ch, 2);
695 i += 2;
696 escapeflag = true;
697 break;
698 default:
699 dev_warn(&port->dev,
700 "%s - unsupported command %i\n",
701 __func__, *(ch + 2));
702 break;
703 }
704 if (escapeflag)
705 continue;
706 }
707
708 tty_buffer_request_room(&port->port, 1);
709 tty_insert_flip_string(&port->port, ch, 1);
710 }
711
712 if (port_priv->is_open)
713 tty_flip_buffer_push(&port->port);
714}
715
716static void qt2_write_bulk_callback(struct urb *urb)
717{
718 struct usb_serial_port *port;
719 struct qt2_port_private *port_priv;
720
721 port = urb->context;
722 port_priv = usb_get_serial_port_data(port);
723
724 spin_lock(&port_priv->urb_lock);
725
726 port_priv->urb_in_use = false;
727 usb_serial_port_softint(port);
728
729 spin_unlock(&port_priv->urb_lock);
730
731}
732
733static void qt2_read_bulk_callback(struct urb *urb)
734{
735 struct usb_serial *serial = urb->context;
736 int status;
737
738 if (urb->status) {
739 dev_warn(&serial->dev->dev,
740 "%s - non-zero urb status: %i\n", __func__,
741 urb->status);
742 return;
743 }
744
745 qt2_process_read_urb(urb);
746
747 status = usb_submit_urb(urb, GFP_ATOMIC);
748 if (status != 0)
749 dev_err(&serial->dev->dev,
750 "%s - resubmit read urb failed: %i\n",
751 __func__, status);
752}
753
754static int qt2_setup_urbs(struct usb_serial *serial)
755{
756 struct usb_serial_port *port0;
757 struct qt2_serial_private *serial_priv;
758 int status;
759
760 port0 = serial->port[0];
761
762 serial_priv = usb_get_serial_data(serial);
763 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
764 if (!serial_priv->read_urb) {
765 dev_err(&serial->dev->dev, "No free urbs available\n");
766 return -ENOMEM;
767 }
768
769 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
770 usb_rcvbulkpipe(serial->dev,
771 port0->bulk_in_endpointAddress),
772 serial_priv->read_buffer,
773 sizeof(serial_priv->read_buffer),
774 qt2_read_bulk_callback, serial);
775
776 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
777 if (status != 0) {
778 dev_err(&serial->dev->dev,
779 "%s - submit read urb failed %i\n", __func__, status);
780 usb_free_urb(serial_priv->read_urb);
781 return status;
782 }
783
784 return 0;
785}
786
787static int qt2_attach(struct usb_serial *serial)
788{
789 struct qt2_serial_private *serial_priv;
790 int status;
791
792
793 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
794 0xc2, 0x40, 0x8000, 0, NULL, 0,
795 QT2_USB_TIMEOUT);
796 if (status < 0) {
797 dev_err(&serial->dev->dev,
798 "%s - failed to power on unit: %i\n", __func__, status);
799 return status;
800 }
801
802 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
803 if (!serial_priv) {
804 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
805 return -ENOMEM;
806 }
807
808 usb_set_serial_data(serial, serial_priv);
809
810 status = qt2_setup_urbs(serial);
811 if (status != 0)
812 goto attach_failed;
813
814 return 0;
815
816attach_failed:
817 kfree(serial_priv);
818 return status;
819}
820
821static int qt2_port_probe(struct usb_serial_port *port)
822{
823 struct usb_serial *serial = port->serial;
824 struct qt2_port_private *port_priv;
825 u8 bEndpointAddress;
826
827 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
828 if (!port_priv)
829 return -ENOMEM;
830
831 spin_lock_init(&port_priv->lock);
832 spin_lock_init(&port_priv->urb_lock);
833 port_priv->port = port;
834
835 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
836 if (!port_priv->write_urb) {
837 kfree(port_priv);
838 return -ENOMEM;
839 }
840 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
841 usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
842 usb_sndbulkpipe(serial->dev, bEndpointAddress),
843 port_priv->write_buffer,
844 sizeof(port_priv->write_buffer),
845 qt2_write_bulk_callback, port);
846
847 usb_set_serial_port_data(port, port_priv);
848
849 return 0;
850}
851
852static int qt2_port_remove(struct usb_serial_port *port)
853{
854 struct qt2_port_private *port_priv;
855
856 port_priv = usb_get_serial_port_data(port);
857 usb_free_urb(port_priv->write_urb);
858 kfree(port_priv);
859
860 return 0;
861}
862
863static int qt2_tiocmget(struct tty_struct *tty)
864{
865 struct usb_serial_port *port = tty->driver_data;
866 struct usb_device *dev = port->serial->dev;
867 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
868 u8 *d;
869 int r;
870
871 d = kzalloc(2, GFP_KERNEL);
872 if (!d)
873 return -ENOMEM;
874
875 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
876 if (r < 0)
877 goto mget_out;
878
879 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
880 if (r < 0)
881 goto mget_out;
882
883 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
884 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
885 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
886 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
887 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
888 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
889
890mget_out:
891 kfree(d);
892 return r;
893}
894
895static int qt2_tiocmset(struct tty_struct *tty,
896 unsigned int set, unsigned int clear)
897{
898 struct qt2_port_private *port_priv;
899
900 port_priv = usb_get_serial_port_data(tty->driver_data);
901 return update_mctrl(port_priv, set, clear);
902}
903
904static void qt2_break_ctl(struct tty_struct *tty, int break_state)
905{
906 struct usb_serial_port *port = tty->driver_data;
907 struct qt2_port_private *port_priv;
908 int status;
909 u16 val;
910
911 port_priv = usb_get_serial_port_data(port);
912
913 if (!port_priv->is_open) {
914 dev_err(&port->dev,
915 "%s - port is not open\n", __func__);
916 return;
917 }
918
919 val = (break_state == -1) ? 1 : 0;
920
921 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
922 val, port_priv->device_port);
923 if (status < 0)
924 dev_warn(&port->dev,
925 "%s - failed to send control message: %i\n", __func__,
926 status);
927}
928
929
930
931static void qt2_dtr_rts(struct usb_serial_port *port, int on)
932{
933 struct usb_device *dev = port->serial->dev;
934 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
935
936
937 if (!on) {
938 if (qt2_setregister(dev, port_priv->device_port,
939 UART_MCR, 0) < 0)
940 dev_warn(&port->dev, "error from flowcontrol urb\n");
941 }
942
943 if (on)
944 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
945 else
946 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
947}
948
949static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
950{
951 struct qt2_port_private *port_priv;
952 u8 newMSR = (u8) *ch;
953 unsigned long flags;
954
955 port_priv = usb_get_serial_port_data(port);
956
957 spin_lock_irqsave(&port_priv->lock, flags);
958 port_priv->shadowMSR = newMSR;
959 spin_unlock_irqrestore(&port_priv->lock, flags);
960
961 if (newMSR & UART_MSR_ANY_DELTA) {
962
963 if (newMSR & UART_MSR_DCTS)
964 port_priv->icount.cts++;
965
966 if (newMSR & UART_MSR_DDSR)
967 port_priv->icount.dsr++;
968
969 if (newMSR & UART_MSR_DDCD)
970 port_priv->icount.dcd++;
971
972 if (newMSR & UART_MSR_TERI)
973 port_priv->icount.rng++;
974
975 wake_up_interruptible(&port->delta_msr_wait);
976 }
977}
978
979static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
980{
981 struct qt2_port_private *port_priv;
982 struct async_icount *icount;
983 unsigned long flags;
984 u8 newLSR = (u8) *ch;
985
986 port_priv = usb_get_serial_port_data(port);
987
988 if (newLSR & UART_LSR_BI)
989 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
990
991 spin_lock_irqsave(&port_priv->lock, flags);
992 port_priv->shadowLSR = newLSR;
993 spin_unlock_irqrestore(&port_priv->lock, flags);
994
995 icount = &port_priv->icount;
996
997 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
998
999 if (newLSR & UART_LSR_BI)
1000 icount->brk++;
1001
1002 if (newLSR & UART_LSR_OE)
1003 icount->overrun++;
1004
1005 if (newLSR & UART_LSR_PE)
1006 icount->parity++;
1007
1008 if (newLSR & UART_LSR_FE)
1009 icount->frame++;
1010 }
1011
1012}
1013
1014static int qt2_write_room(struct tty_struct *tty)
1015{
1016 struct usb_serial_port *port = tty->driver_data;
1017 struct qt2_port_private *port_priv;
1018 unsigned long flags = 0;
1019 int r;
1020
1021 port_priv = usb_get_serial_port_data(port);
1022
1023 spin_lock_irqsave(&port_priv->urb_lock, flags);
1024
1025 if (port_priv->urb_in_use)
1026 r = 0;
1027 else
1028 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
1029
1030 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1031
1032 return r;
1033}
1034
1035static int qt2_write(struct tty_struct *tty,
1036 struct usb_serial_port *port,
1037 const unsigned char *buf, int count)
1038{
1039 struct qt2_port_private *port_priv;
1040 struct urb *write_urb;
1041 unsigned char *data;
1042 unsigned long flags;
1043 int status;
1044 int bytes_out = 0;
1045
1046 port_priv = usb_get_serial_port_data(port);
1047
1048 if (port_priv->write_urb == NULL) {
1049 dev_err(&port->dev, "%s - no output urb\n", __func__);
1050 return 0;
1051 }
1052 write_urb = port_priv->write_urb;
1053
1054 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
1055
1056 data = write_urb->transfer_buffer;
1057 spin_lock_irqsave(&port_priv->urb_lock, flags);
1058 if (port_priv->urb_in_use == true) {
1059 dev_err(&port->dev, "qt2_write - urb is in use\n");
1060 goto write_out;
1061 }
1062
1063 *data++ = QT2_CONTROL_BYTE;
1064 *data++ = QT2_CONTROL_BYTE;
1065 *data++ = port_priv->device_port;
1066 put_unaligned_le16(count, data);
1067 data += 2;
1068 memcpy(data, buf, count);
1069
1070 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
1071
1072 status = usb_submit_urb(write_urb, GFP_ATOMIC);
1073 if (status == 0) {
1074 port_priv->urb_in_use = true;
1075 bytes_out += count;
1076 }
1077
1078write_out:
1079 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1080 return bytes_out;
1081}
1082
1083
1084static struct usb_serial_driver qt2_device = {
1085 .driver = {
1086 .owner = THIS_MODULE,
1087 .name = "quatech-serial",
1088 },
1089 .description = DRIVER_DESC,
1090 .id_table = id_table,
1091 .open = qt2_open,
1092 .close = qt2_close,
1093 .write = qt2_write,
1094 .write_room = qt2_write_room,
1095 .calc_num_ports = qt2_calc_num_ports,
1096 .attach = qt2_attach,
1097 .release = qt2_release,
1098 .disconnect = qt2_disconnect,
1099 .port_probe = qt2_port_probe,
1100 .port_remove = qt2_port_remove,
1101 .dtr_rts = qt2_dtr_rts,
1102 .break_ctl = qt2_break_ctl,
1103 .tiocmget = qt2_tiocmget,
1104 .tiocmset = qt2_tiocmset,
1105 .get_icount = qt2_get_icount,
1106 .ioctl = qt2_ioctl,
1107 .set_termios = qt2_set_termios,
1108};
1109
1110static struct usb_serial_driver *const serial_drivers[] = {
1111 &qt2_device, NULL
1112};
1113
1114module_usb_serial_driver(serial_drivers, id_table);
1115
1116MODULE_DESCRIPTION(DRIVER_DESC);
1117MODULE_LICENSE("GPL");
1118
