1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Ours Technology Inc. OTi-6858 USB to serial adapter driver.
4 *
5 * Copyleft (C) 2007 Kees Lemmens (adapted for kernel 2.6.20)
6 * Copyright (C) 2006 Tomasz Michal Lukaszewski (FIXME: add e-mail)
7 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
8 * Copyright (C) 2003 IBM Corp.
9 *
10 * Many thanks to the authors of pl2303 driver: all functions in this file
11 * are heavily based on pl2303 code, buffering code is a 1-to-1 copy.
12 *
13 * Warning! You use this driver on your own risk! The only official
14 * description of this device I have is datasheet from manufacturer,
15 * and it doesn't contain almost any information needed to write a driver.
16 * Almost all knowlegde used while writing this driver was gathered by:
17 * - analyzing traffic between device and the M$ Windows 2000 driver,
18 * - trying different bit combinations and checking pin states
19 * with a voltmeter,
20 * - receiving malformed frames and producing buffer overflows
21 * to learn how errors are reported,
22 * So, THIS CODE CAN DESTROY OTi-6858 AND ANY OTHER DEVICES, THAT ARE
23 * CONNECTED TO IT!
24 *
25 * See Documentation/usb/usb-serial.txt for more information on using this
26 * driver
27 *
28 * TODO:
29 * - implement correct flushing for ioctls and oti6858_close()
30 * - check how errors (rx overflow, parity error, framing error) are reported
31 * - implement oti6858_break_ctl()
32 * - implement more ioctls
33 * - test/implement flow control
34 * - allow setting custom baud rates
35 */
36
37 #include <linux/kernel.h>
38 #include <linux/errno.h>
39 #include <linux/slab.h>
40 #include <linux/tty.h>
41 #include <linux/tty_driver.h>
42 #include <linux/tty_flip.h>
43 #include <linux/serial.h>
44 #include <linux/module.h>
45 #include <linux/moduleparam.h>
46 #include <linux/spinlock.h>
47 #include <linux/usb.h>
48 #include <linux/usb/serial.h>
49 #include <linux/uaccess.h>
50 #include <linux/kfifo.h>
51 #include "oti6858.h"
52
53 #define OTI6858_DESCRIPTION \
54 "Ours Technology Inc. OTi-6858 USB to serial adapter driver"
55 #define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
56
57 static const struct usb_device_id id_table[] = {
58 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
59 { }
60 };
61
62 MODULE_DEVICE_TABLE(usb, id_table);
63
64 /* requests */
65 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
66 #define OTI6858_REQ_T_GET_STATUS 0x01
67
68 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
69 #define OTI6858_REQ_T_SET_LINE 0x00
70
71 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
72 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00
73
74 /* format of the control packet */
75 struct oti6858_control_pkt {
76 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */
77 #define OTI6858_MAX_BAUD_RATE 3000000
78 u8 frame_fmt;
79 #define FMT_STOP_BITS_MASK 0xc0
80 #define FMT_STOP_BITS_1 0x00
81 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */
82 #define FMT_PARITY_MASK 0x38
83 #define FMT_PARITY_NONE 0x00
84 #define FMT_PARITY_ODD 0x08
85 #define FMT_PARITY_EVEN 0x18
86 #define FMT_PARITY_MARK 0x28
87 #define FMT_PARITY_SPACE 0x38
88 #define FMT_DATA_BITS_MASK 0x03
89 #define FMT_DATA_BITS_5 0x00
90 #define FMT_DATA_BITS_6 0x01
91 #define FMT_DATA_BITS_7 0x02
92 #define FMT_DATA_BITS_8 0x03
93 u8 something; /* always equals 0x43 */
94 u8 control; /* settings of flow control lines */
95 #define CONTROL_MASK 0x0c
96 #define CONTROL_DTR_HIGH 0x08
97 #define CONTROL_RTS_HIGH 0x04
98 u8 tx_status;
99 #define TX_BUFFER_EMPTIED 0x09
100 u8 pin_state;
101 #define PIN_MASK 0x3f
102 #define PIN_MSR_MASK 0x1b
103 #define PIN_RTS 0x20 /* output pin */
104 #define PIN_CTS 0x10 /* input pin, active low */
105 #define PIN_DSR 0x08 /* input pin, active low */
106 #define PIN_DTR 0x04 /* output pin */
107 #define PIN_RI 0x02 /* input pin, active low */
108 #define PIN_DCD 0x01 /* input pin, active low */
109 u8 rx_bytes_avail; /* number of bytes in rx buffer */;
110 };
111
112 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
113 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
114 (((a)->divisor == (priv)->pending_setup.divisor) \
115 && ((a)->control == (priv)->pending_setup.control) \
116 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
117
118 /* function prototypes */
119 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
120 static void oti6858_close(struct usb_serial_port *port);
121 static void oti6858_set_termios(struct tty_struct *tty,
122 struct usb_serial_port *port, struct ktermios *old);
123 static void oti6858_init_termios(struct tty_struct *tty);
124 static void oti6858_read_int_callback(struct urb *urb);
125 static void oti6858_read_bulk_callback(struct urb *urb);
126 static void oti6858_write_bulk_callback(struct urb *urb);
127 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
128 const unsigned char *buf, int count);
129 static int oti6858_write_room(struct tty_struct *tty);
130 static int oti6858_chars_in_buffer(struct tty_struct *tty);
131 static int oti6858_tiocmget(struct tty_struct *tty);
132 static int oti6858_tiocmset(struct tty_struct *tty,
133 unsigned int set, unsigned int clear);
134 static int oti6858_port_probe(struct usb_serial_port *port);
135 static int oti6858_port_remove(struct usb_serial_port *port);
136
137 /* device info */
138 static struct usb_serial_driver oti6858_device = {
139 .driver = {
140 .owner = THIS_MODULE,
141 .name = "oti6858",
142 },
143 .id_table = id_table,
144 .num_ports = 1,
145 .num_bulk_in = 1,
146 .num_bulk_out = 1,
147 .num_interrupt_in = 1,
148 .open = oti6858_open,
149 .close = oti6858_close,
150 .write = oti6858_write,
151 .set_termios = oti6858_set_termios,
152 .init_termios = oti6858_init_termios,
153 .tiocmget = oti6858_tiocmget,
154 .tiocmset = oti6858_tiocmset,
155 .tiocmiwait = usb_serial_generic_tiocmiwait,
156 .read_bulk_callback = oti6858_read_bulk_callback,
157 .read_int_callback = oti6858_read_int_callback,
158 .write_bulk_callback = oti6858_write_bulk_callback,
159 .write_room = oti6858_write_room,
160 .chars_in_buffer = oti6858_chars_in_buffer,
161 .port_probe = oti6858_port_probe,
162 .port_remove = oti6858_port_remove,
163 };
164
165 static struct usb_serial_driver * const serial_drivers[] = {
166 &oti6858_device, NULL
167 };
168
169 struct oti6858_private {
170 spinlock_t lock;
171
172 struct oti6858_control_pkt status;
173
174 struct {
175 u8 read_urb_in_use;
176 u8 write_urb_in_use;
177 } flags;
178 struct delayed_work delayed_write_work;
179
180 struct {
181 __le16 divisor;
182 u8 frame_fmt;
183 u8 control;
184 } pending_setup;
185 u8 transient;
186 u8 setup_done;
187 struct delayed_work delayed_setup_work;
188
189 struct usb_serial_port *port; /* USB port with which associated */
190 };
191
setup_line(struct work_struct * work)192 static void setup_line(struct work_struct *work)
193 {
194 struct oti6858_private *priv = container_of(work,
195 struct oti6858_private, delayed_setup_work.work);
196 struct usb_serial_port *port = priv->port;
197 struct oti6858_control_pkt *new_setup;
198 unsigned long flags;
199 int result;
200
201 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
202 if (!new_setup) {
203 /* we will try again */
204 schedule_delayed_work(&priv->delayed_setup_work,
205 msecs_to_jiffies(2));
206 return;
207 }
208
209 result = usb_control_msg(port->serial->dev,
210 usb_rcvctrlpipe(port->serial->dev, 0),
211 OTI6858_REQ_T_GET_STATUS,
212 OTI6858_REQ_GET_STATUS,
213 0, 0,
214 new_setup, OTI6858_CTRL_PKT_SIZE,
215 100);
216
217 if (result != OTI6858_CTRL_PKT_SIZE) {
218 dev_err(&port->dev, "%s(): error reading status\n", __func__);
219 kfree(new_setup);
220 /* we will try again */
221 schedule_delayed_work(&priv->delayed_setup_work,
222 msecs_to_jiffies(2));
223 return;
224 }
225
226 spin_lock_irqsave(&priv->lock, flags);
227 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
228 new_setup->divisor = priv->pending_setup.divisor;
229 new_setup->control = priv->pending_setup.control;
230 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
231
232 spin_unlock_irqrestore(&priv->lock, flags);
233 result = usb_control_msg(port->serial->dev,
234 usb_sndctrlpipe(port->serial->dev, 0),
235 OTI6858_REQ_T_SET_LINE,
236 OTI6858_REQ_SET_LINE,
237 0, 0,
238 new_setup, OTI6858_CTRL_PKT_SIZE,
239 100);
240 } else {
241 spin_unlock_irqrestore(&priv->lock, flags);
242 result = 0;
243 }
244 kfree(new_setup);
245
246 spin_lock_irqsave(&priv->lock, flags);
247 if (result != OTI6858_CTRL_PKT_SIZE)
248 priv->transient = 0;
249 priv->setup_done = 1;
250 spin_unlock_irqrestore(&priv->lock, flags);
251
252 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
253 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
254 if (result != 0) {
255 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
256 __func__, result);
257 }
258 }
259
send_data(struct work_struct * work)260 static void send_data(struct work_struct *work)
261 {
262 struct oti6858_private *priv = container_of(work,
263 struct oti6858_private, delayed_write_work.work);
264 struct usb_serial_port *port = priv->port;
265 int count = 0, result;
266 unsigned long flags;
267 u8 *allow;
268
269 spin_lock_irqsave(&priv->lock, flags);
270 if (priv->flags.write_urb_in_use) {
271 spin_unlock_irqrestore(&priv->lock, flags);
272 schedule_delayed_work(&priv->delayed_write_work,
273 msecs_to_jiffies(2));
274 return;
275 }
276 priv->flags.write_urb_in_use = 1;
277 spin_unlock_irqrestore(&priv->lock, flags);
278
279 spin_lock_irqsave(&port->lock, flags);
280 count = kfifo_len(&port->write_fifo);
281 spin_unlock_irqrestore(&port->lock, flags);
282
283 if (count > port->bulk_out_size)
284 count = port->bulk_out_size;
285
286 if (count != 0) {
287 allow = kmalloc(1, GFP_KERNEL);
288 if (!allow)
289 return;
290
291 result = usb_control_msg(port->serial->dev,
292 usb_rcvctrlpipe(port->serial->dev, 0),
293 OTI6858_REQ_T_CHECK_TXBUFF,
294 OTI6858_REQ_CHECK_TXBUFF,
295 count, 0, allow, 1, 100);
296 if (result != 1 || *allow != 0)
297 count = 0;
298 kfree(allow);
299 }
300
301 if (count == 0) {
302 priv->flags.write_urb_in_use = 0;
303
304 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
305 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
306 if (result != 0) {
307 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
308 __func__, result);
309 }
310 return;
311 }
312
313 count = kfifo_out_locked(&port->write_fifo,
314 port->write_urb->transfer_buffer,
315 count, &port->lock);
316 port->write_urb->transfer_buffer_length = count;
317 result = usb_submit_urb(port->write_urb, GFP_NOIO);
318 if (result != 0) {
319 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
320 __func__, result);
321 priv->flags.write_urb_in_use = 0;
322 }
323
324 usb_serial_port_softint(port);
325 }
326
oti6858_port_probe(struct usb_serial_port * port)327 static int oti6858_port_probe(struct usb_serial_port *port)
328 {
329 struct oti6858_private *priv;
330
331 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
332 if (!priv)
333 return -ENOMEM;
334
335 spin_lock_init(&priv->lock);
336 priv->port = port;
337 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
338 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
339
340 usb_set_serial_port_data(port, priv);
341
342 port->port.drain_delay = 256; /* FIXME: check the FIFO length */
343
344 return 0;
345 }
346
oti6858_port_remove(struct usb_serial_port * port)347 static int oti6858_port_remove(struct usb_serial_port *port)
348 {
349 struct oti6858_private *priv;
350
351 priv = usb_get_serial_port_data(port);
352 kfree(priv);
353
354 return 0;
355 }
356
oti6858_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * buf,int count)357 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
358 const unsigned char *buf, int count)
359 {
360 if (!count)
361 return count;
362
363 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
364
365 return count;
366 }
367
oti6858_write_room(struct tty_struct * tty)368 static int oti6858_write_room(struct tty_struct *tty)
369 {
370 struct usb_serial_port *port = tty->driver_data;
371 int room = 0;
372 unsigned long flags;
373
374 spin_lock_irqsave(&port->lock, flags);
375 room = kfifo_avail(&port->write_fifo);
376 spin_unlock_irqrestore(&port->lock, flags);
377
378 return room;
379 }
380
oti6858_chars_in_buffer(struct tty_struct * tty)381 static int oti6858_chars_in_buffer(struct tty_struct *tty)
382 {
383 struct usb_serial_port *port = tty->driver_data;
384 int chars = 0;
385 unsigned long flags;
386
387 spin_lock_irqsave(&port->lock, flags);
388 chars = kfifo_len(&port->write_fifo);
389 spin_unlock_irqrestore(&port->lock, flags);
390
391 return chars;
392 }
393
oti6858_init_termios(struct tty_struct * tty)394 static void oti6858_init_termios(struct tty_struct *tty)
395 {
396 tty->termios = tty_std_termios;
397 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
398 tty->termios.c_ispeed = 38400;
399 tty->termios.c_ospeed = 38400;
400 }
401
oti6858_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)402 static void oti6858_set_termios(struct tty_struct *tty,
403 struct usb_serial_port *port, struct ktermios *old_termios)
404 {
405 struct oti6858_private *priv = usb_get_serial_port_data(port);
406 unsigned long flags;
407 unsigned int cflag;
408 u8 frame_fmt, control;
409 __le16 divisor;
410 int br;
411
412 cflag = tty->termios.c_cflag;
413
414 spin_lock_irqsave(&priv->lock, flags);
415 divisor = priv->pending_setup.divisor;
416 frame_fmt = priv->pending_setup.frame_fmt;
417 control = priv->pending_setup.control;
418 spin_unlock_irqrestore(&priv->lock, flags);
419
420 frame_fmt &= ~FMT_DATA_BITS_MASK;
421 switch (cflag & CSIZE) {
422 case CS5:
423 frame_fmt |= FMT_DATA_BITS_5;
424 break;
425 case CS6:
426 frame_fmt |= FMT_DATA_BITS_6;
427 break;
428 case CS7:
429 frame_fmt |= FMT_DATA_BITS_7;
430 break;
431 default:
432 case CS8:
433 frame_fmt |= FMT_DATA_BITS_8;
434 break;
435 }
436
437 /* manufacturer claims that this device can work with baud rates
438 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
439 * guarantee that any other baud rate will work (especially
440 * the higher ones)
441 */
442 br = tty_get_baud_rate(tty);
443 if (br == 0) {
444 divisor = 0;
445 } else {
446 int real_br;
447 int new_divisor;
448 br = min(br, OTI6858_MAX_BAUD_RATE);
449
450 new_divisor = (96000000 + 8 * br) / (16 * br);
451 real_br = 96000000 / (16 * new_divisor);
452 divisor = cpu_to_le16(new_divisor);
453 tty_encode_baud_rate(tty, real_br, real_br);
454 }
455
456 frame_fmt &= ~FMT_STOP_BITS_MASK;
457 if ((cflag & CSTOPB) != 0)
458 frame_fmt |= FMT_STOP_BITS_2;
459 else
460 frame_fmt |= FMT_STOP_BITS_1;
461
462 frame_fmt &= ~FMT_PARITY_MASK;
463 if ((cflag & PARENB) != 0) {
464 if ((cflag & PARODD) != 0)
465 frame_fmt |= FMT_PARITY_ODD;
466 else
467 frame_fmt |= FMT_PARITY_EVEN;
468 } else {
469 frame_fmt |= FMT_PARITY_NONE;
470 }
471
472 control &= ~CONTROL_MASK;
473 if ((cflag & CRTSCTS) != 0)
474 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
475
476 /* change control lines if we are switching to or from B0 */
477 /* FIXME:
478 spin_lock_irqsave(&priv->lock, flags);
479 control = priv->line_control;
480 if ((cflag & CBAUD) == B0)
481 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
482 else
483 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
484 if (control != priv->line_control) {
485 control = priv->line_control;
486 spin_unlock_irqrestore(&priv->lock, flags);
487 set_control_lines(serial->dev, control);
488 } else {
489 spin_unlock_irqrestore(&priv->lock, flags);
490 }
491 */
492
493 spin_lock_irqsave(&priv->lock, flags);
494 if (divisor != priv->pending_setup.divisor
495 || control != priv->pending_setup.control
496 || frame_fmt != priv->pending_setup.frame_fmt) {
497 priv->pending_setup.divisor = divisor;
498 priv->pending_setup.control = control;
499 priv->pending_setup.frame_fmt = frame_fmt;
500 }
501 spin_unlock_irqrestore(&priv->lock, flags);
502 }
503
oti6858_open(struct tty_struct * tty,struct usb_serial_port * port)504 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
505 {
506 struct oti6858_private *priv = usb_get_serial_port_data(port);
507 struct usb_serial *serial = port->serial;
508 struct oti6858_control_pkt *buf;
509 unsigned long flags;
510 int result;
511
512 usb_clear_halt(serial->dev, port->write_urb->pipe);
513 usb_clear_halt(serial->dev, port->read_urb->pipe);
514
515 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
516 if (!buf)
517 return -ENOMEM;
518
519 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
520 OTI6858_REQ_T_GET_STATUS,
521 OTI6858_REQ_GET_STATUS,
522 0, 0,
523 buf, OTI6858_CTRL_PKT_SIZE,
524 100);
525 if (result != OTI6858_CTRL_PKT_SIZE) {
526 /* assume default (after power-on reset) values */
527 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
528 buf->frame_fmt = 0x03; /* 8N1 */
529 buf->something = 0x43;
530 buf->control = 0x4c; /* DTR, RTS */
531 buf->tx_status = 0x00;
532 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
533 buf->rx_bytes_avail = 0x00;
534 }
535
536 spin_lock_irqsave(&priv->lock, flags);
537 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
538 priv->pending_setup.divisor = buf->divisor;
539 priv->pending_setup.frame_fmt = buf->frame_fmt;
540 priv->pending_setup.control = buf->control;
541 spin_unlock_irqrestore(&priv->lock, flags);
542 kfree(buf);
543
544 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
545 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
546 if (result != 0) {
547 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
548 __func__, result);
549 oti6858_close(port);
550 return result;
551 }
552
553 /* setup termios */
554 if (tty)
555 oti6858_set_termios(tty, port, NULL);
556
557 return 0;
558 }
559
oti6858_close(struct usb_serial_port * port)560 static void oti6858_close(struct usb_serial_port *port)
561 {
562 struct oti6858_private *priv = usb_get_serial_port_data(port);
563 unsigned long flags;
564
565 spin_lock_irqsave(&port->lock, flags);
566 /* clear out any remaining data in the buffer */
567 kfifo_reset_out(&port->write_fifo);
568 spin_unlock_irqrestore(&port->lock, flags);
569
570 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
571
572 /* cancel scheduled setup */
573 cancel_delayed_work_sync(&priv->delayed_setup_work);
574 cancel_delayed_work_sync(&priv->delayed_write_work);
575
576 /* shutdown our urbs */
577 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
578 usb_kill_urb(port->write_urb);
579 usb_kill_urb(port->read_urb);
580 usb_kill_urb(port->interrupt_in_urb);
581 }
582
oti6858_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)583 static int oti6858_tiocmset(struct tty_struct *tty,
584 unsigned int set, unsigned int clear)
585 {
586 struct usb_serial_port *port = tty->driver_data;
587 struct oti6858_private *priv = usb_get_serial_port_data(port);
588 unsigned long flags;
589 u8 control;
590
591 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
592 __func__, set, clear);
593
594 /* FIXME: check if this is correct (active high/low) */
595 spin_lock_irqsave(&priv->lock, flags);
596 control = priv->pending_setup.control;
597 if ((set & TIOCM_RTS) != 0)
598 control |= CONTROL_RTS_HIGH;
599 if ((set & TIOCM_DTR) != 0)
600 control |= CONTROL_DTR_HIGH;
601 if ((clear & TIOCM_RTS) != 0)
602 control &= ~CONTROL_RTS_HIGH;
603 if ((clear & TIOCM_DTR) != 0)
604 control &= ~CONTROL_DTR_HIGH;
605
606 if (control != priv->pending_setup.control)
607 priv->pending_setup.control = control;
608
609 spin_unlock_irqrestore(&priv->lock, flags);
610 return 0;
611 }
612
oti6858_tiocmget(struct tty_struct * tty)613 static int oti6858_tiocmget(struct tty_struct *tty)
614 {
615 struct usb_serial_port *port = tty->driver_data;
616 struct oti6858_private *priv = usb_get_serial_port_data(port);
617 unsigned long flags;
618 unsigned pin_state;
619 unsigned result = 0;
620
621 spin_lock_irqsave(&priv->lock, flags);
622 pin_state = priv->status.pin_state & PIN_MASK;
623 spin_unlock_irqrestore(&priv->lock, flags);
624
625 /* FIXME: check if this is correct (active high/low) */
626 if ((pin_state & PIN_RTS) != 0)
627 result |= TIOCM_RTS;
628 if ((pin_state & PIN_CTS) != 0)
629 result |= TIOCM_CTS;
630 if ((pin_state & PIN_DSR) != 0)
631 result |= TIOCM_DSR;
632 if ((pin_state & PIN_DTR) != 0)
633 result |= TIOCM_DTR;
634 if ((pin_state & PIN_RI) != 0)
635 result |= TIOCM_RI;
636 if ((pin_state & PIN_DCD) != 0)
637 result |= TIOCM_CD;
638
639 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
640
641 return result;
642 }
643
oti6858_read_int_callback(struct urb * urb)644 static void oti6858_read_int_callback(struct urb *urb)
645 {
646 struct usb_serial_port *port = urb->context;
647 struct oti6858_private *priv = usb_get_serial_port_data(port);
648 int transient = 0, can_recv = 0, resubmit = 1;
649 int status = urb->status;
650
651 switch (status) {
652 case 0:
653 /* success */
654 break;
655 case -ECONNRESET:
656 case -ENOENT:
657 case -ESHUTDOWN:
658 /* this urb is terminated, clean up */
659 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
660 __func__, status);
661 return;
662 default:
663 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
664 __func__, status);
665 break;
666 }
667
668 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
669 struct oti6858_control_pkt *xs = urb->transfer_buffer;
670 unsigned long flags;
671
672 spin_lock_irqsave(&priv->lock, flags);
673
674 if (!priv->transient) {
675 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
676 if (xs->rx_bytes_avail == 0) {
677 priv->transient = 4;
678 priv->setup_done = 0;
679 resubmit = 0;
680 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
681 schedule_delayed_work(&priv->delayed_setup_work, 0);
682 }
683 }
684 } else {
685 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
686 priv->transient = 0;
687 } else if (!priv->setup_done) {
688 resubmit = 0;
689 } else if (--priv->transient == 0) {
690 if (xs->rx_bytes_avail == 0) {
691 priv->transient = 4;
692 priv->setup_done = 0;
693 resubmit = 0;
694 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
695 schedule_delayed_work(&priv->delayed_setup_work, 0);
696 }
697 }
698 }
699
700 if (!priv->transient) {
701 u8 delta = xs->pin_state ^ priv->status.pin_state;
702
703 if (delta & PIN_MSR_MASK) {
704 if (delta & PIN_CTS)
705 port->icount.cts++;
706 if (delta & PIN_DSR)
707 port->icount.dsr++;
708 if (delta & PIN_RI)
709 port->icount.rng++;
710 if (delta & PIN_DCD)
711 port->icount.dcd++;
712
713 wake_up_interruptible(&port->port.delta_msr_wait);
714 }
715
716 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
717 }
718
719 if (!priv->transient && xs->rx_bytes_avail != 0) {
720 can_recv = xs->rx_bytes_avail;
721 priv->flags.read_urb_in_use = 1;
722 }
723
724 transient = priv->transient;
725 spin_unlock_irqrestore(&priv->lock, flags);
726 }
727
728 if (can_recv) {
729 int result;
730
731 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
732 if (result != 0) {
733 priv->flags.read_urb_in_use = 0;
734 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
735 " error %d\n", __func__, result);
736 } else {
737 resubmit = 0;
738 }
739 } else if (!transient) {
740 unsigned long flags;
741 int count;
742
743 spin_lock_irqsave(&port->lock, flags);
744 count = kfifo_len(&port->write_fifo);
745 spin_unlock_irqrestore(&port->lock, flags);
746
747 spin_lock_irqsave(&priv->lock, flags);
748 if (priv->flags.write_urb_in_use == 0 && count != 0) {
749 schedule_delayed_work(&priv->delayed_write_work, 0);
750 resubmit = 0;
751 }
752 spin_unlock_irqrestore(&priv->lock, flags);
753 }
754
755 if (resubmit) {
756 int result;
757
758 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */
759 result = usb_submit_urb(urb, GFP_ATOMIC);
760 if (result != 0) {
761 dev_err(&urb->dev->dev,
762 "%s(): usb_submit_urb() failed with"
763 " error %d\n", __func__, result);
764 }
765 }
766 }
767
oti6858_read_bulk_callback(struct urb * urb)768 static void oti6858_read_bulk_callback(struct urb *urb)
769 {
770 struct usb_serial_port *port = urb->context;
771 struct oti6858_private *priv = usb_get_serial_port_data(port);
772 unsigned char *data = urb->transfer_buffer;
773 unsigned long flags;
774 int status = urb->status;
775 int result;
776
777 spin_lock_irqsave(&priv->lock, flags);
778 priv->flags.read_urb_in_use = 0;
779 spin_unlock_irqrestore(&priv->lock, flags);
780
781 if (status != 0) {
782 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
783 return;
784 }
785
786 if (urb->actual_length > 0) {
787 tty_insert_flip_string(&port->port, data, urb->actual_length);
788 tty_flip_buffer_push(&port->port);
789 }
790
791 /* schedule the interrupt urb */
792 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
793 if (result != 0 && result != -EPERM) {
794 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
795 " error %d\n", __func__, result);
796 }
797 }
798
oti6858_write_bulk_callback(struct urb * urb)799 static void oti6858_write_bulk_callback(struct urb *urb)
800 {
801 struct usb_serial_port *port = urb->context;
802 struct oti6858_private *priv = usb_get_serial_port_data(port);
803 int status = urb->status;
804 int result;
805
806 switch (status) {
807 case 0:
808 /* success */
809 break;
810 case -ECONNRESET:
811 case -ENOENT:
812 case -ESHUTDOWN:
813 /* this urb is terminated, clean up */
814 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
815 priv->flags.write_urb_in_use = 0;
816 return;
817 default:
818 /* error in the urb, so we have to resubmit it */
819 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
820 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
821
822 port->write_urb->transfer_buffer_length = 1;
823 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
824 if (result) {
825 dev_err_console(port, "%s(): usb_submit_urb() failed,"
826 " error %d\n", __func__, result);
827 } else {
828 return;
829 }
830 }
831
832 priv->flags.write_urb_in_use = 0;
833
834 /* schedule the interrupt urb if we are still open */
835 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
836 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
837 if (result != 0) {
838 dev_err(&port->dev, "%s(): failed submitting int urb,"
839 " error %d\n", __func__, result);
840 }
841 }
842
843 module_usb_serial_driver(serial_drivers, id_table);
844
845 MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
846 MODULE_AUTHOR(OTI6858_AUTHOR);
847 MODULE_LICENSE("GPL v2");
848
