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USB: omninet: fix port-data memory leak
[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
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/* Version Information */
69#define DRIVER_VERSION "v0.1"
70#define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
71
72#define USB_VENDOR_ID_QUATECH 0x061d
73#define QUATECH_SSU2_100 0xC120 /* RS232 single port */
74#define QUATECH_DSU2_100 0xC140 /* RS232 dual port */
75#define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */
76#define QUATECH_QSU2_100 0xC160 /* RS232 four port */
77#define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */
78#define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */
79#define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */
80
81struct qt2_device_detail {
82 int product_id;
83 int num_ports;
84};
85
86#define QT_DETAILS(prod, ports) \
87 .product_id = (prod), \
88 .num_ports = (ports)
89
90static const struct qt2_device_detail qt2_device_details[] = {
91 {QT_DETAILS(QUATECH_SSU2_100, 1)},
92 {QT_DETAILS(QUATECH_DSU2_400, 2)},
93 {QT_DETAILS(QUATECH_DSU2_100, 2)},
94 {QT_DETAILS(QUATECH_QSU2_400, 4)},
95 {QT_DETAILS(QUATECH_QSU2_100, 4)},
96 {QT_DETAILS(QUATECH_ESU2_400, 8)},
97 {QT_DETAILS(QUATECH_ESU2_100, 8)},
98 {QT_DETAILS(0, 0)} /* Terminating entry */
99};
100
101static const struct usb_device_id id_table[] = {
102 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
103 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
104 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
105 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
106 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
107 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
108 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
109 {} /* Terminating entry */
110};
111MODULE_DEVICE_TABLE(usb, id_table);
112
113struct qt2_serial_private {
114 unsigned char current_port; /* current port for incoming data */
115
116 struct urb *read_urb; /* shared among all ports */
117 char read_buffer[512];
118};
119
120struct qt2_port_private {
121 bool is_open;
122 u8 device_port;
123
124 spinlock_t urb_lock;
125 bool urb_in_use;
126 struct urb *write_urb;
127 char write_buffer[QT2_WRITE_BUFFER_SIZE];
128
129 spinlock_t lock;
130 u8 shadowLSR;
131 u8 shadowMSR;
132
133 wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
134 struct async_icount icount;
135
136 struct usb_serial_port *port;
137};
138
139static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
140static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
141static void qt2_write_bulk_callback(struct urb *urb);
142static void qt2_read_bulk_callback(struct urb *urb);
143
144static void qt2_release(struct usb_serial *serial)
145{
146 int i;
147
148 kfree(usb_get_serial_data(serial));
149
150 for (i = 0; i < serial->num_ports; i++)
151 kfree(usb_get_serial_port_data(serial->port[i]));
152}
153
154static inline int calc_baud_divisor(int baudrate)
155{
156 int divisor, rem;
157
158 divisor = MAX_BAUD_RATE / baudrate;
159 rem = MAX_BAUD_RATE % baudrate;
160 /* Round to nearest divisor */
161 if (((rem * 2) >= baudrate) && (baudrate != 110))
162 divisor++;
163
164 return divisor;
165}
166
167static inline int qt2_set_port_config(struct usb_device *dev,
168 unsigned char port_number,
169 u16 baudrate, u16 lcr)
170{
171 int divisor = calc_baud_divisor(baudrate);
172 u16 index = ((u16) (lcr << 8) | (u16) (port_number));
173
174 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
175 QT2_GET_SET_UART, 0x40,
176 divisor, index, NULL, 0, QT2_USB_TIMEOUT);
177}
178
179static inline int qt2_control_msg(struct usb_device *dev,
180 u8 request, u16 data, u16 index)
181{
182 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
183 request, 0x40, data, index,
184 NULL, 0, QT2_USB_TIMEOUT);
185}
186
187static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
188{
189 u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
190
191 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
192}
193
194
195static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
196{
197 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
198 QT_SET_GET_DEVICE, 0xc0, 0, 0,
199 data, 3, QT2_USB_TIMEOUT);
200}
201
202static inline int qt2_getregister(struct usb_device *dev,
203 u8 uart,
204 u8 reg,
205 u8 *data)
206{
207 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
208 QT_SET_GET_REGISTER, 0xc0, reg,
209 uart, data, sizeof(*data), QT2_USB_TIMEOUT);
210
211}
212
213static inline int qt2_setregister(struct usb_device *dev,
214 u8 uart, u8 reg, u16 data)
215{
216 u16 value = (data << 8) | reg;
217
218 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
219 QT_SET_GET_REGISTER, 0x40, value, uart,
220 NULL, 0, QT2_USB_TIMEOUT);
221}
222
223static inline int update_mctrl(struct qt2_port_private *port_priv,
224 unsigned int set, unsigned int clear)
225{
226 struct usb_serial_port *port = port_priv->port;
227 struct usb_device *dev = port->serial->dev;
228 unsigned urb_value;
229 int status;
230
231 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
232 dev_dbg(&port->dev,
233 "update_mctrl - DTR|RTS not being set|cleared\n");
234 return 0; /* no change */
235 }
236
237 clear &= ~set; /* 'set' takes precedence over 'clear' */
238 urb_value = 0;
239 if (set & TIOCM_DTR)
240 urb_value |= UART_MCR_DTR;
241 if (set & TIOCM_RTS)
242 urb_value |= UART_MCR_RTS;
243
244 status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
245 urb_value);
246 if (status < 0)
247 dev_err(&port->dev,
248 "update_mctrl - Error from MODEM_CTRL urb: %i\n",
249 status);
250 return status;
251}
252
253static int qt2_calc_num_ports(struct usb_serial *serial)
254{
255 struct qt2_device_detail d;
256 int i;
257
258 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
259 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
260 return d.num_ports;
261 }
262
263 /* we didn't recognize the device */
264 dev_err(&serial->dev->dev,
265 "don't know the number of ports, assuming 1\n");
266
267 return 1;
268}
269
270static void qt2_set_termios(struct tty_struct *tty,
271 struct usb_serial_port *port,
272 struct ktermios *old_termios)
273{
274 struct usb_device *dev = port->serial->dev;
275 struct qt2_port_private *port_priv;
adc8d746 276 struct ktermios *termios = &tty->termios;
f7a33e60
BP		 277 u16 baud;
278 unsigned int cflag = termios->c_cflag;
279 u16 new_lcr = 0;
280 int status;
281
282 port_priv = usb_get_serial_port_data(port);
283
284 if (cflag & PARENB) {
285 if (cflag & PARODD)
286 new_lcr |= UART_LCR_PARITY;
287 else
288 new_lcr |= SERIAL_EVEN_PARITY;
289 }
290
291 switch (cflag & CSIZE) {
292 case CS5:
293 new_lcr |= UART_LCR_WLEN5;
294 break;
295 case CS6:
296 new_lcr |= UART_LCR_WLEN6;
297 break;
298 case CS7:
299 new_lcr |= UART_LCR_WLEN7;
300 break;
301 default:
302 case CS8:
303 new_lcr |= UART_LCR_WLEN8;
304 break;
305 }
306
307 baud = tty_get_baud_rate(tty);
308 if (!baud)
309 baud = 9600;
310
311 status = qt2_set_port_config(dev, port_priv->device_port, baud,
312 new_lcr);
313 if (status < 0)
314 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
315 __func__, status);
316
317 if (cflag & CRTSCTS)
318 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
319 SERIAL_CRTSCTS,
320 port_priv->device_port);
321 else
322 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
323 0, port_priv->device_port);
324 if (status < 0)
325 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
326 __func__, status);
327
328 if (I_IXOFF(tty) || I_IXON(tty)) {
329 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
330
331 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
332 x, port_priv->device_port);
333 } else
334 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
335 0, port_priv->device_port);
336
337 if (status < 0)
338 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
339 __func__, status);
340
341}
342
343static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
344{
345 struct usb_serial *serial;
f7a33e60
BP		 346 struct qt2_port_private *port_priv;
347 u8 *data;
348 u16 device_port;
349 int status;
350 unsigned long flags;
351
352 device_port = (u16) (port->number - port->serial->minor);
353
354 serial = port->serial;
355
356 port_priv = usb_get_serial_port_data(port);
f7a33e60
BP		 357
358 /* set the port to RS232 mode */
359 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
360 QT2_QMCR_RS232, device_port);
361 if (status < 0) {
362 dev_err(&port->dev,
363 "%s failed to set RS232 mode for port %i error %i\n",
364 __func__, device_port, status);
365 return status;
366 }
367
368 data = kzalloc(2, GFP_KERNEL);
369 if (!data)
370 return -ENOMEM;
371
372 /* open the port */
373 status = usb_control_msg(serial->dev,
374 usb_rcvctrlpipe(serial->dev, 0),
375 QT_OPEN_CLOSE_CHANNEL,
376 0xc0, 0,
377 device_port, data, 2, QT2_USB_TIMEOUT);
378
379 if (status < 0) {
380 dev_err(&port->dev, "%s - open port failed %i", __func__,
381 status);
382 kfree(data);
383 return status;
384 }
385
386 spin_lock_irqsave(&port_priv->lock, flags);
387 port_priv->shadowLSR = data[0];
388 port_priv->shadowMSR = data[1];
389 spin_unlock_irqrestore(&port_priv->lock, flags);
390
391 kfree(data);
392
393 /* set to default speed and 8bit word size */
394 status = qt2_set_port_config(serial->dev, device_port,
395 DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
396 if (status < 0) {
397 dev_err(&port->dev,
398 "%s - initial setup failed for port %i (%i)\n",
399 __func__, port->number, device_port);
400 return status;
401 }
402
403 port_priv->is_open = true;
404 port_priv->device_port = (u8) device_port;
405
406 if (tty)
adc8d746 407 qt2_set_termios(tty, port, &tty->termios);
f7a33e60
BP		 408
409 return 0;
410
411}
412
413static void qt2_close(struct usb_serial_port *port)
414{
415 struct usb_serial *serial;
f7a33e60
BP		 416 struct qt2_port_private *port_priv;
417 unsigned long flags;
418 int i;
419
420 serial = port->serial;
f7a33e60
BP		 421 port_priv = usb_get_serial_port_data(port);
422
423 port_priv->is_open = false;
424
425 spin_lock_irqsave(&port_priv->urb_lock, flags);
426 if (port_priv->write_urb->status == -EINPROGRESS)
427 usb_kill_urb(port_priv->write_urb);
428 port_priv->urb_in_use = false;
429 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
430
431 /* flush the port transmit buffer */
432 i = usb_control_msg(serial->dev,
433 usb_rcvctrlpipe(serial->dev, 0),
434 QT2_FLUSH_DEVICE, 0x40, 1,
435 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
436
437 if (i < 0)
438 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
439 __func__, i);
440
441 /* flush the port receive buffer */
442 i = usb_control_msg(serial->dev,
443 usb_rcvctrlpipe(serial->dev, 0),
444 QT2_FLUSH_DEVICE, 0x40, 0,
445 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
446
447 if (i < 0)
448 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
449 __func__, i);
450
451 /* close the port */
452 i = usb_control_msg(serial->dev,
453 usb_sndctrlpipe(serial->dev, 0),
454 QT_OPEN_CLOSE_CHANNEL,
455 0x40, 0,
456 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
457
458 if (i < 0)
459 dev_err(&port->dev, "%s - close port failed %i\n",
460 __func__, i);
461
462}
463
464static void qt2_disconnect(struct usb_serial *serial)
465{
466 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
467 struct qt2_port_private *port_priv;
468 int i;
469
470 if (serial_priv->read_urb->status == -EINPROGRESS)
471 usb_kill_urb(serial_priv->read_urb);
472
473 usb_free_urb(serial_priv->read_urb);
474
475 for (i = 0; i < serial->num_ports; i++) {
476 port_priv = usb_get_serial_port_data(serial->port[i]);
477
478 if (port_priv->write_urb->status == -EINPROGRESS)
479 usb_kill_urb(port_priv->write_urb);
480 usb_free_urb(port_priv->write_urb);
481 }
482}
483
484static int get_serial_info(struct usb_serial_port *port,
485 struct serial_struct __user *retinfo)
486{
487 struct serial_struct tmp;
488
489 if (!retinfo)
490 return -EFAULT;
491
492 memset(&tmp, 0, sizeof(tmp));
493 tmp.line = port->serial->minor;
494 tmp.port = 0;
495 tmp.irq = 0;
496 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
497 tmp.xmit_fifo_size = port->bulk_out_size;
498 tmp.baud_base = 9600;
499 tmp.close_delay = 5*HZ;
500 tmp.closing_wait = 30*HZ;
501
502 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
503 return -EFAULT;
504 return 0;
505}
506
507static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
508{
509 struct qt2_port_private *priv = usb_get_serial_port_data(port);
510 struct async_icount prev, cur;
511 unsigned long flags;
512
513 spin_lock_irqsave(&priv->lock, flags);
514 prev = priv->icount;
515 spin_unlock_irqrestore(&priv->lock, flags);
516
517 while (1) {
518 wait_event_interruptible(priv->delta_msr_wait,
519 ((priv->icount.rng != prev.rng) ||
520 (priv->icount.dsr != prev.dsr) ||
521 (priv->icount.dcd != prev.dcd) ||
522 (priv->icount.cts != prev.cts)));
523
524 if (signal_pending(current))
525 return -ERESTARTSYS;
526
527 spin_lock_irqsave(&priv->lock, flags);
528 cur = priv->icount;
529 spin_unlock_irqrestore(&priv->lock, flags);
530
531 if ((prev.rng == cur.rng) &&
532 (prev.dsr == cur.dsr) &&
533 (prev.dcd == cur.dcd) &&
534 (prev.cts == cur.cts))
535 return -EIO;
536
537 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
538 (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
539 (arg & TIOCM_CD && (prev.dcd != cur.dcd)) ||
540 (arg & TIOCM_CTS && (prev.cts != cur.cts)))
541 return 0;
542 }
543 return 0;
544}
545
546static int qt2_get_icount(struct tty_struct *tty,
547 struct serial_icounter_struct *icount)
548{
549 struct usb_serial_port *port = tty->driver_data;
550 struct qt2_port_private *priv = usb_get_serial_port_data(port);
551 struct async_icount cnow = priv->icount;
552
553 icount->cts = cnow.cts;
554 icount->dsr = cnow.dsr;
555 icount->rng = cnow.rng;
556 icount->dcd = cnow.dcd;
557 icount->rx = cnow.rx;
558 icount->tx = cnow.tx;
559 icount->frame = cnow.frame;
560 icount->overrun = cnow.overrun;
561 icount->parity = cnow.parity;
562 icount->brk = cnow.brk;
563 icount->buf_overrun = cnow.buf_overrun;
564
565 return 0;
566}
567
568static int qt2_ioctl(struct tty_struct *tty,
569 unsigned int cmd, unsigned long arg)
570{
571 struct usb_serial_port *port = tty->driver_data;
572
573 switch (cmd) {
574 case TIOCGSERIAL:
575 return get_serial_info(port,
576 (struct serial_struct __user *)arg);
577
578 case TIOCMIWAIT:
579 return wait_modem_info(port, arg);
580
581 default:
582 break;
583 }
584
585 return -ENOIOCTLCMD;
586}
587
588static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
589{
590 switch (*ch) {
591 case QT2_LINE_STATUS:
592 qt2_update_lsr(port, ch + 1);
593 break;
594 case QT2_MODEM_STATUS:
595 qt2_update_msr(port, ch + 1);
596 break;
597 }
598}
599
600/* not needed, kept to document functionality */
601static void qt2_process_xmit_empty(struct usb_serial_port *port,
602 unsigned char *ch)
603{
604 int bytes_written;
605
606 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
607}
608
609/* not needed, kept to document functionality */
610static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
611{
612 return;
613}
614
615void qt2_process_read_urb(struct urb *urb)
616{
617 struct usb_serial *serial;
618 struct qt2_serial_private *serial_priv;
619 struct usb_serial_port *port;
620 struct qt2_port_private *port_priv;
621 struct tty_struct *tty;
622 bool escapeflag;
623 unsigned char *ch;
624 int i;
625 unsigned char newport;
626 int len = urb->actual_length;
627
628 if (!len)
629 return;
630
631 ch = urb->transfer_buffer;
632 tty = NULL;
633 serial = urb->context;
634 serial_priv = usb_get_serial_data(serial);
635 port = serial->port[serial_priv->current_port];
636 port_priv = usb_get_serial_port_data(port);
637
638 if (port_priv->is_open)
639 tty = tty_port_tty_get(&port->port);
640
641 for (i = 0; i < urb->actual_length; i++) {
642 ch = (unsigned char *)urb->transfer_buffer + i;
643 if ((i <= (len - 3)) &&
644 (*ch == QT2_CONTROL_BYTE) &&
645 (*(ch + 1) == QT2_CONTROL_BYTE)) {
646 escapeflag = false;
647 switch (*(ch + 2)) {
648 case QT2_LINE_STATUS:
649 case QT2_MODEM_STATUS:
650 if (i > (len - 4)) {
651 dev_warn(&port->dev,
652 "%s - status message too short\n",
653 __func__);
654 break;
655 }
656 qt2_process_status(port, ch + 2);
657 i += 3;
658 escapeflag = true;
659 break;
660 case QT2_XMIT_HOLD:
661 if (i > (len - 5)) {
662 dev_warn(&port->dev,
663 "%s - xmit_empty message too short\n",
664 __func__);
665 break;
666 }
667 qt2_process_xmit_empty(port, ch + 3);
668 i += 4;
669 escapeflag = true;
670 break;
671 case QT2_CHANGE_PORT:
672 if (i > (len - 4)) {
673 dev_warn(&port->dev,
674 "%s - change_port message too short\n",
675 __func__);
676 break;
677 }
678 if (tty) {
679 tty_flip_buffer_push(tty);
680 tty_kref_put(tty);
681 }
682
683 newport = *(ch + 3);
684
685 if (newport > serial->num_ports) {
686 dev_err(&port->dev,
687 "%s - port change to invalid port: %i\n",
688 __func__, newport);
689 break;
690 }
691
692 serial_priv->current_port = newport;
693 port = serial->port[serial_priv->current_port];
694 port_priv = usb_get_serial_port_data(port);
695 if (port_priv->is_open)
696 tty = tty_port_tty_get(&port->port);
697 else
698 tty = NULL;
699 i += 3;
700 escapeflag = true;
701 break;
702 case QT2_REC_FLUSH:
703 case QT2_XMIT_FLUSH:
704 qt2_process_flush(port, ch + 2);
705 i += 2;
706 escapeflag = true;
707 break;
708 case QT2_CONTROL_ESCAPE:
709 tty_buffer_request_room(tty, 2);
710 tty_insert_flip_string(tty, ch, 2);
711 i += 2;
712 escapeflag = true;
713 break;
714 default:
715 dev_warn(&port->dev,
716 "%s - unsupported command %i\n",
717 __func__, *(ch + 2));
718 break;
719 }
720 if (escapeflag)
721 continue;
722 }
723
724 if (tty) {
725 tty_buffer_request_room(tty, 1);
726 tty_insert_flip_string(tty, ch, 1);
727 }
728 }
729
730 if (tty) {
731 tty_flip_buffer_push(tty);
732 tty_kref_put(tty);
733 }
734}
735
736static void qt2_write_bulk_callback(struct urb *urb)
737{
738 struct usb_serial_port *port;
739 struct qt2_port_private *port_priv;
740
741 port = urb->context;
742 port_priv = usb_get_serial_port_data(port);
743
744 spin_lock(&port_priv->urb_lock);
745
746 port_priv->urb_in_use = false;
747 usb_serial_port_softint(port);
748
749 spin_unlock(&port_priv->urb_lock);
750
751}
752
753static void qt2_read_bulk_callback(struct urb *urb)
754{
755 struct usb_serial *serial = urb->context;
756 int status;
757
758 if (urb->status) {
759 dev_warn(&serial->dev->dev,
760 "%s - non-zero urb status: %i\n", __func__,
761 urb->status);
762 return;
763 }
764
765 qt2_process_read_urb(urb);
766
767 status = usb_submit_urb(urb, GFP_ATOMIC);
768 if (status != 0)
769 dev_err(&serial->dev->dev,
770 "%s - resubmit read urb failed: %i\n",
771 __func__, status);
772}
773
774static int qt2_setup_urbs(struct usb_serial *serial)
775{
776 struct usb_serial_port *port;
777 struct usb_serial_port *port0;
778 struct qt2_serial_private *serial_priv;
779 struct qt2_port_private *port_priv;
780 int pcount, status;
781
782 port0 = serial->port[0];
783
784 serial_priv = usb_get_serial_data(serial);
785 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
786 if (!serial_priv->read_urb) {
787 dev_err(&serial->dev->dev, "No free urbs available\n");
788 return -ENOMEM;
789 }
790
791 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
792 usb_rcvbulkpipe(serial->dev,
793 port0->bulk_in_endpointAddress),
794 serial_priv->read_buffer,
795 sizeof(serial_priv->read_buffer),
796 qt2_read_bulk_callback, serial);
797
798 /* setup write_urb for each port */
799 for (pcount = 0; pcount < serial->num_ports; pcount++) {
800
801 port = serial->port[pcount];
802 port_priv = usb_get_serial_port_data(port);
803
804 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
805 if (!port_priv->write_urb) {
806 dev_err(&serial->dev->dev,
807 "failed to alloc write_urb for port %i\n",
808 pcount);
809 return -ENOMEM;
810 }
811
812 usb_fill_bulk_urb(port_priv->write_urb,
813 serial->dev,
814 usb_sndbulkpipe(serial->dev,
815 port0->
816 bulk_out_endpointAddress),
817 port_priv->write_buffer,
818 sizeof(port_priv->write_buffer),
819 qt2_write_bulk_callback, port);
820 }
821
822 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
823 if (status != 0) {
824 dev_err(&serial->dev->dev,
825 "%s - submit read urb failed %i\n", __func__, status);
826 return status;
827 }
828
829 return 0;
830
831}
832
833static int qt2_attach(struct usb_serial *serial)
834{
835 struct qt2_serial_private *serial_priv;
836 struct qt2_port_private *port_priv;
837 int status, pcount;
838
839 /* power on unit */
840 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
841 0xc2, 0x40, 0x8000, 0, NULL, 0,
842 QT2_USB_TIMEOUT);
843 if (status < 0) {
844 dev_err(&serial->dev->dev,
845 "%s - failed to power on unit: %i\n", __func__, status);
846 return status;
847 }
848
849 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
850 if (!serial_priv) {
851 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
852 return -ENOMEM;
853 }
854
855 usb_set_serial_data(serial, serial_priv);
856
857 for (pcount = 0; pcount < serial->num_ports; pcount++) {
858 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
859 if (!port_priv) {
860 dev_err(&serial->dev->dev,
861 "%s- kmalloc(%Zd) failed.\n", __func__,
862 sizeof(*port_priv));
863 pcount--;
864 status = -ENOMEM;
865 goto attach_failed;
866 }
867
868 spin_lock_init(&port_priv->lock);
869 spin_lock_init(&port_priv->urb_lock);
870 init_waitqueue_head(&port_priv->delta_msr_wait);
871
872 port_priv->port = serial->port[pcount];
873
874 usb_set_serial_port_data(serial->port[pcount], port_priv);
875 }
876
877 status = qt2_setup_urbs(serial);
878 if (status != 0)
879 goto attach_failed;
880
881 return 0;
882
883attach_failed:
884 for (/* empty */; pcount >= 0; pcount--) {
885 port_priv = usb_get_serial_port_data(serial->port[pcount]);
886 kfree(port_priv);
887 }
888 kfree(serial_priv);
889 return status;
890}
891
892static int qt2_tiocmget(struct tty_struct *tty)
893{
894 struct usb_serial_port *port = tty->driver_data;
895 struct usb_device *dev = port->serial->dev;
896 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
897 u8 *d;
898 int r;
899
900 d = kzalloc(2, GFP_KERNEL);
901 if (!d)
902 return -ENOMEM;
903
904 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
905 if (r < 0)
906 goto mget_out;
907
908 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
909 if (r < 0)
910 goto mget_out;
911
912 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
913 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
914 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
915 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
916 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
917 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
918
919mget_out:
920 kfree(d);
921 return r;
922}
923
924static int qt2_tiocmset(struct tty_struct *tty,
925 unsigned int set, unsigned int clear)
926{
927 struct qt2_port_private *port_priv;
928
929 port_priv = usb_get_serial_port_data(tty->driver_data);
930 return update_mctrl(port_priv, set, clear);
931}
932
933static void qt2_break_ctl(struct tty_struct *tty, int break_state)
934{
935 struct usb_serial_port *port = tty->driver_data;
936 struct qt2_port_private *port_priv;
937 int status;
938 u16 val;
939
940 port_priv = usb_get_serial_port_data(port);
941
942 if (!port_priv->is_open) {
943 dev_err(&port->dev,
944 "%s - port is not open\n", __func__);
945 return;
946 }
947
948 val = (break_state == -1) ? 1 : 0;
949
950 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
951 val, port_priv->device_port);
952 if (status < 0)
953 dev_warn(&port->dev,
954 "%s - failed to send control message: %i\n", __func__,
955 status);
956}
957
958
959
960static void qt2_dtr_rts(struct usb_serial_port *port, int on)
961{
962 struct usb_device *dev = port->serial->dev;
963 struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
964
965 mutex_lock(&port->serial->disc_mutex);
966 if (!port->serial->disconnected) {
967 /* Disable flow control */
968 if (!on && qt2_setregister(dev, port_priv->device_port,
969 UART_MCR, 0) < 0)
970 dev_warn(&port->dev, "error from flowcontrol urb\n");
971 /* drop RTS and DTR */
972 if (on)
973 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
974 else
975 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
976 }
977 mutex_unlock(&port->serial->disc_mutex);
978}
979
980static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
981{
982 struct qt2_port_private *port_priv;
983 u8 newMSR = (u8) *ch;
984 unsigned long flags;
985
986 port_priv = usb_get_serial_port_data(port);
987
988 spin_lock_irqsave(&port_priv->lock, flags);
989 port_priv->shadowMSR = newMSR;
990 spin_unlock_irqrestore(&port_priv->lock, flags);
991
992 if (newMSR & UART_MSR_ANY_DELTA) {
993 /* update input line counters */
994 if (newMSR & UART_MSR_DCTS)
995 port_priv->icount.cts++;
996
997 if (newMSR & UART_MSR_DDSR)
998 port_priv->icount.dsr++;
999
1000 if (newMSR & UART_MSR_DDCD)
1001 port_priv->icount.dcd++;
1002
1003 if (newMSR & UART_MSR_TERI)
1004 port_priv->icount.rng++;
1005
1006 wake_up_interruptible(&port_priv->delta_msr_wait);
1007 }
1008}
1009
1010static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
1011{
1012 struct qt2_port_private *port_priv;
1013 struct async_icount *icount;
1014 unsigned long flags;
1015 u8 newLSR = (u8) *ch;
1016
1017 port_priv = usb_get_serial_port_data(port);
1018
1019 if (newLSR & UART_LSR_BI)
1020 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
1021
1022 spin_lock_irqsave(&port_priv->lock, flags);
1023 port_priv->shadowLSR = newLSR;
1024 spin_unlock_irqrestore(&port_priv->lock, flags);
1025
1026 icount = &port_priv->icount;
1027
1028 if (newLSR & UART_LSR_BRK_ERROR_BITS) {
1029
1030 if (newLSR & UART_LSR_BI)
1031 icount->brk++;
1032
1033 if (newLSR & UART_LSR_OE)
1034 icount->overrun++;
1035
1036 if (newLSR & UART_LSR_PE)
1037 icount->parity++;
1038
1039 if (newLSR & UART_LSR_FE)
1040 icount->frame++;
1041 }
1042
1043}
1044
1045static int qt2_write_room(struct tty_struct *tty)
1046{
1047 struct usb_serial_port *port = tty->driver_data;
1048 struct qt2_port_private *port_priv;
1049 unsigned long flags = 0;
1050 int r;
1051
1052 port_priv = usb_get_serial_port_data(port);
1053
1054 spin_lock_irqsave(&port_priv->urb_lock, flags);
1055
1056 if (port_priv->urb_in_use)
1057 r = 0;
1058 else
1059 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
1060
1061 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1062
1063 return r;
1064}
1065
1066static int qt2_write(struct tty_struct *tty,
1067 struct usb_serial_port *port,
1068 const unsigned char *buf, int count)
1069{
1070 struct qt2_port_private *port_priv;
1071 struct urb *write_urb;
1072 unsigned char *data;
1073 unsigned long flags;
1074 int status;
1075 int bytes_out = 0;
1076
1077 port_priv = usb_get_serial_port_data(port);
1078
1079 if (port_priv->write_urb == NULL) {
1080 dev_err(&port->dev, "%s - no output urb\n", __func__);
1081 return 0;
1082 }
1083 write_urb = port_priv->write_urb;
1084
1085 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
1086
1087 data = write_urb->transfer_buffer;
1088 spin_lock_irqsave(&port_priv->urb_lock, flags);
1089 if (port_priv->urb_in_use == true) {
788a661a 1090 dev_err(&port->dev, "qt2_write - urb is in use\n");
f7a33e60
BP		 1091 goto write_out;
1092 }
1093
1094 *data++ = QT2_CONTROL_BYTE;
1095 *data++ = QT2_CONTROL_BYTE;
1096 *data++ = port_priv->device_port;
1097 put_unaligned_le16(count, data);
1098 data += 2;
1099 memcpy(data, buf, count);
1100
1101 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
1102
1103 status = usb_submit_urb(write_urb, GFP_ATOMIC);
1104 if (status == 0) {
1105 port_priv->urb_in_use = true;
1106 bytes_out += count;
1107 }
1108
1109write_out:
1110 spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1111 return bytes_out;
1112}
1113
1114
1115static struct usb_serial_driver qt2_device = {
1116 .driver = {
1117 .owner = THIS_MODULE,
1118 .name = "quatech-serial",
1119 },
1120 .description = DRIVER_DESC,
1121 .id_table = id_table,
1122 .open = qt2_open,
1123 .close = qt2_close,
1124 .write = qt2_write,
1125 .write_room = qt2_write_room,
1126 .calc_num_ports = qt2_calc_num_ports,
1127 .attach = qt2_attach,
1128 .release = qt2_release,
1129 .disconnect = qt2_disconnect,
1130 .dtr_rts = qt2_dtr_rts,
1131 .break_ctl = qt2_break_ctl,
1132 .tiocmget = qt2_tiocmget,
1133 .tiocmset = qt2_tiocmset,
1134 .get_icount = qt2_get_icount,
1135 .ioctl = qt2_ioctl,
1136 .set_termios = qt2_set_termios,
1137};
1138
1139static struct usb_serial_driver *const serial_drivers[] = {
1140 &qt2_device, NULL
1141};
1142
1143module_usb_serial_driver(serial_drivers, id_table);
1144
1145MODULE_DESCRIPTION(DRIVER_DESC);
1146MODULE_LICENSE("GPL");
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