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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
57static const struct usb_device_id id_table[] = {
58 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
59 { }
60};
61
62MODULE_DEVICE_TABLE(usb, id_table);
63
64
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
75struct oti6858_control_pkt {
76 __le16 divisor;
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
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;
94 u8 control;
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
104#define PIN_CTS 0x10
105#define PIN_DSR 0x08
106#define PIN_DTR 0x04
107#define PIN_RI 0x02
108#define PIN_DCD 0x01
109 u8 rx_bytes_avail; ;
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
119static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
120static void oti6858_close(struct usb_serial_port *port);
121static void oti6858_set_termios(struct tty_struct *tty,
122 struct usb_serial_port *port, struct ktermios *old);
123static void oti6858_init_termios(struct tty_struct *tty);
124static void oti6858_read_int_callback(struct urb *urb);
125static void oti6858_read_bulk_callback(struct urb *urb);
126static void oti6858_write_bulk_callback(struct urb *urb);
127static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
128 const unsigned char *buf, int count);
129static int oti6858_write_room(struct tty_struct *tty);
130static int oti6858_chars_in_buffer(struct tty_struct *tty);
131static int oti6858_tiocmget(struct tty_struct *tty);
132static int oti6858_tiocmset(struct tty_struct *tty,
133 unsigned int set, unsigned int clear);
134static int oti6858_port_probe(struct usb_serial_port *port);
135static int oti6858_port_remove(struct usb_serial_port *port);
136
137
138static 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
165static struct usb_serial_driver * const serial_drivers[] = {
166 &oti6858_device, NULL
167};
168
169struct 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;
190};
191
192static 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
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
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
260static 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
327static 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;
343
344 return 0;
345}
346
347static 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
357static 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
368static 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
381static 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
394static void oti6858_init_termios(struct tty_struct *tty)
395{
396 tty_encode_baud_rate(tty, 38400, 38400);
397}
398
399static void oti6858_set_termios(struct tty_struct *tty,
400 struct usb_serial_port *port, struct ktermios *old_termios)
401{
402 struct oti6858_private *priv = usb_get_serial_port_data(port);
403 unsigned long flags;
404 unsigned int cflag;
405 u8 frame_fmt, control;
406 __le16 divisor;
407 int br;
408
409 cflag = tty->termios.c_cflag;
410
411 spin_lock_irqsave(&priv->lock, flags);
412 divisor = priv->pending_setup.divisor;
413 frame_fmt = priv->pending_setup.frame_fmt;
414 control = priv->pending_setup.control;
415 spin_unlock_irqrestore(&priv->lock, flags);
416
417 frame_fmt &= ~FMT_DATA_BITS_MASK;
418 switch (cflag & CSIZE) {
419 case CS5:
420 frame_fmt |= FMT_DATA_BITS_5;
421 break;
422 case CS6:
423 frame_fmt |= FMT_DATA_BITS_6;
424 break;
425 case CS7:
426 frame_fmt |= FMT_DATA_BITS_7;
427 break;
428 default:
429 case CS8:
430 frame_fmt |= FMT_DATA_BITS_8;
431 break;
432 }
433
434
435
436
437
438
439 br = tty_get_baud_rate(tty);
440 if (br == 0) {
441 divisor = 0;
442 } else {
443 int real_br;
444 int new_divisor;
445 br = min(br, OTI6858_MAX_BAUD_RATE);
446
447 new_divisor = (96000000 + 8 * br) / (16 * br);
448 real_br = 96000000 / (16 * new_divisor);
449 divisor = cpu_to_le16(new_divisor);
450 tty_encode_baud_rate(tty, real_br, real_br);
451 }
452
453 frame_fmt &= ~FMT_STOP_BITS_MASK;
454 if ((cflag & CSTOPB) != 0)
455 frame_fmt |= FMT_STOP_BITS_2;
456 else
457 frame_fmt |= FMT_STOP_BITS_1;
458
459 frame_fmt &= ~FMT_PARITY_MASK;
460 if ((cflag & PARENB) != 0) {
461 if ((cflag & PARODD) != 0)
462 frame_fmt |= FMT_PARITY_ODD;
463 else
464 frame_fmt |= FMT_PARITY_EVEN;
465 } else {
466 frame_fmt |= FMT_PARITY_NONE;
467 }
468
469 control &= ~CONTROL_MASK;
470 if ((cflag & CRTSCTS) != 0)
471 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
472
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489
490 spin_lock_irqsave(&priv->lock, flags);
491 if (divisor != priv->pending_setup.divisor
492 || control != priv->pending_setup.control
493 || frame_fmt != priv->pending_setup.frame_fmt) {
494 priv->pending_setup.divisor = divisor;
495 priv->pending_setup.control = control;
496 priv->pending_setup.frame_fmt = frame_fmt;
497 }
498 spin_unlock_irqrestore(&priv->lock, flags);
499}
500
501static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
502{
503 struct oti6858_private *priv = usb_get_serial_port_data(port);
504 struct usb_serial *serial = port->serial;
505 struct oti6858_control_pkt *buf;
506 unsigned long flags;
507 int result;
508
509 usb_clear_halt(serial->dev, port->write_urb->pipe);
510 usb_clear_halt(serial->dev, port->read_urb->pipe);
511
512 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
513 if (!buf)
514 return -ENOMEM;
515
516 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
517 OTI6858_REQ_T_GET_STATUS,
518 OTI6858_REQ_GET_STATUS,
519 0, 0,
520 buf, OTI6858_CTRL_PKT_SIZE,
521 100);
522 if (result != OTI6858_CTRL_PKT_SIZE) {
523
524 buf->divisor = cpu_to_le16(0x009c);
525 buf->frame_fmt = 0x03;
526 buf->something = 0x43;
527 buf->control = 0x4c;
528 buf->tx_status = 0x00;
529 buf->pin_state = 0x5b;
530 buf->rx_bytes_avail = 0x00;
531 }
532
533 spin_lock_irqsave(&priv->lock, flags);
534 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
535 priv->pending_setup.divisor = buf->divisor;
536 priv->pending_setup.frame_fmt = buf->frame_fmt;
537 priv->pending_setup.control = buf->control;
538 spin_unlock_irqrestore(&priv->lock, flags);
539 kfree(buf);
540
541 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
542 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
543 if (result != 0) {
544 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
545 __func__, result);
546 oti6858_close(port);
547 return result;
548 }
549
550
551 if (tty)
552 oti6858_set_termios(tty, port, NULL);
553
554 return 0;
555}
556
557static void oti6858_close(struct usb_serial_port *port)
558{
559 struct oti6858_private *priv = usb_get_serial_port_data(port);
560 unsigned long flags;
561
562 spin_lock_irqsave(&port->lock, flags);
563
564 kfifo_reset_out(&port->write_fifo);
565 spin_unlock_irqrestore(&port->lock, flags);
566
567 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
568
569
570 cancel_delayed_work_sync(&priv->delayed_setup_work);
571 cancel_delayed_work_sync(&priv->delayed_write_work);
572
573
574 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
575 usb_kill_urb(port->write_urb);
576 usb_kill_urb(port->read_urb);
577 usb_kill_urb(port->interrupt_in_urb);
578}
579
580static int oti6858_tiocmset(struct tty_struct *tty,
581 unsigned int set, unsigned int clear)
582{
583 struct usb_serial_port *port = tty->driver_data;
584 struct oti6858_private *priv = usb_get_serial_port_data(port);
585 unsigned long flags;
586 u8 control;
587
588 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
589 __func__, set, clear);
590
591
592 spin_lock_irqsave(&priv->lock, flags);
593 control = priv->pending_setup.control;
594 if ((set & TIOCM_RTS) != 0)
595 control |= CONTROL_RTS_HIGH;
596 if ((set & TIOCM_DTR) != 0)
597 control |= CONTROL_DTR_HIGH;
598 if ((clear & TIOCM_RTS) != 0)
599 control &= ~CONTROL_RTS_HIGH;
600 if ((clear & TIOCM_DTR) != 0)
601 control &= ~CONTROL_DTR_HIGH;
602
603 if (control != priv->pending_setup.control)
604 priv->pending_setup.control = control;
605
606 spin_unlock_irqrestore(&priv->lock, flags);
607 return 0;
608}
609
610static int oti6858_tiocmget(struct tty_struct *tty)
611{
612 struct usb_serial_port *port = tty->driver_data;
613 struct oti6858_private *priv = usb_get_serial_port_data(port);
614 unsigned long flags;
615 unsigned pin_state;
616 unsigned result = 0;
617
618 spin_lock_irqsave(&priv->lock, flags);
619 pin_state = priv->status.pin_state & PIN_MASK;
620 spin_unlock_irqrestore(&priv->lock, flags);
621
622
623 if ((pin_state & PIN_RTS) != 0)
624 result |= TIOCM_RTS;
625 if ((pin_state & PIN_CTS) != 0)
626 result |= TIOCM_CTS;
627 if ((pin_state & PIN_DSR) != 0)
628 result |= TIOCM_DSR;
629 if ((pin_state & PIN_DTR) != 0)
630 result |= TIOCM_DTR;
631 if ((pin_state & PIN_RI) != 0)
632 result |= TIOCM_RI;
633 if ((pin_state & PIN_DCD) != 0)
634 result |= TIOCM_CD;
635
636 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
637
638 return result;
639}
640
641static void oti6858_read_int_callback(struct urb *urb)
642{
643 struct usb_serial_port *port = urb->context;
644 struct oti6858_private *priv = usb_get_serial_port_data(port);
645 int transient = 0, can_recv = 0, resubmit = 1;
646 int status = urb->status;
647
648 switch (status) {
649 case 0:
650
651 break;
652 case -ECONNRESET:
653 case -ENOENT:
654 case -ESHUTDOWN:
655
656 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
657 __func__, status);
658 return;
659 default:
660 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
661 __func__, status);
662 break;
663 }
664
665 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
666 struct oti6858_control_pkt *xs = urb->transfer_buffer;
667 unsigned long flags;
668
669 spin_lock_irqsave(&priv->lock, flags);
670
671 if (!priv->transient) {
672 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
673 if (xs->rx_bytes_avail == 0) {
674 priv->transient = 4;
675 priv->setup_done = 0;
676 resubmit = 0;
677 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
678 schedule_delayed_work(&priv->delayed_setup_work, 0);
679 }
680 }
681 } else {
682 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
683 priv->transient = 0;
684 } else if (!priv->setup_done) {
685 resubmit = 0;
686 } else if (--priv->transient == 0) {
687 if (xs->rx_bytes_avail == 0) {
688 priv->transient = 4;
689 priv->setup_done = 0;
690 resubmit = 0;
691 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
692 schedule_delayed_work(&priv->delayed_setup_work, 0);
693 }
694 }
695 }
696
697 if (!priv->transient) {
698 u8 delta = xs->pin_state ^ priv->status.pin_state;
699
700 if (delta & PIN_MSR_MASK) {
701 if (delta & PIN_CTS)
702 port->icount.cts++;
703 if (delta & PIN_DSR)
704 port->icount.dsr++;
705 if (delta & PIN_RI)
706 port->icount.rng++;
707 if (delta & PIN_DCD)
708 port->icount.dcd++;
709
710 wake_up_interruptible(&port->port.delta_msr_wait);
711 }
712
713 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
714 }
715
716 if (!priv->transient && xs->rx_bytes_avail != 0) {
717 can_recv = xs->rx_bytes_avail;
718 priv->flags.read_urb_in_use = 1;
719 }
720
721 transient = priv->transient;
722 spin_unlock_irqrestore(&priv->lock, flags);
723 }
724
725 if (can_recv) {
726 int result;
727
728 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
729 if (result != 0) {
730 priv->flags.read_urb_in_use = 0;
731 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
732 " error %d\n", __func__, result);
733 } else {
734 resubmit = 0;
735 }
736 } else if (!transient) {
737 unsigned long flags;
738 int count;
739
740 spin_lock_irqsave(&port->lock, flags);
741 count = kfifo_len(&port->write_fifo);
742 spin_unlock_irqrestore(&port->lock, flags);
743
744 spin_lock_irqsave(&priv->lock, flags);
745 if (priv->flags.write_urb_in_use == 0 && count != 0) {
746 schedule_delayed_work(&priv->delayed_write_work, 0);
747 resubmit = 0;
748 }
749 spin_unlock_irqrestore(&priv->lock, flags);
750 }
751
752 if (resubmit) {
753 int result;
754
755
756 result = usb_submit_urb(urb, GFP_ATOMIC);
757 if (result != 0) {
758 dev_err(&urb->dev->dev,
759 "%s(): usb_submit_urb() failed with"
760 " error %d\n", __func__, result);
761 }
762 }
763}
764
765static void oti6858_read_bulk_callback(struct urb *urb)
766{
767 struct usb_serial_port *port = urb->context;
768 struct oti6858_private *priv = usb_get_serial_port_data(port);
769 unsigned char *data = urb->transfer_buffer;
770 unsigned long flags;
771 int status = urb->status;
772 int result;
773
774 spin_lock_irqsave(&priv->lock, flags);
775 priv->flags.read_urb_in_use = 0;
776 spin_unlock_irqrestore(&priv->lock, flags);
777
778 if (status != 0) {
779 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
780 return;
781 }
782
783 if (urb->actual_length > 0) {
784 tty_insert_flip_string(&port->port, data, urb->actual_length);
785 tty_flip_buffer_push(&port->port);
786 }
787
788
789 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
790 if (result != 0 && result != -EPERM) {
791 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
792 " error %d\n", __func__, result);
793 }
794}
795
796static void oti6858_write_bulk_callback(struct urb *urb)
797{
798 struct usb_serial_port *port = urb->context;
799 struct oti6858_private *priv = usb_get_serial_port_data(port);
800 int status = urb->status;
801 int result;
802
803 switch (status) {
804 case 0:
805
806 break;
807 case -ECONNRESET:
808 case -ENOENT:
809 case -ESHUTDOWN:
810
811 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
812 priv->flags.write_urb_in_use = 0;
813 return;
814 default:
815
816 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
817 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
818
819 port->write_urb->transfer_buffer_length = 1;
820 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
821 if (result) {
822 dev_err_console(port, "%s(): usb_submit_urb() failed,"
823 " error %d\n", __func__, result);
824 } else {
825 return;
826 }
827 }
828
829 priv->flags.write_urb_in_use = 0;
830
831
832 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
833 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
834 if (result != 0) {
835 dev_err(&port->dev, "%s(): failed submitting int urb,"
836 " error %d\n", __func__, result);
837 }
838}
839
840module_usb_serial_driver(serial_drivers, id_table);
841
842MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
843MODULE_AUTHOR(OTI6858_AUTHOR);
844MODULE_LICENSE("GPL v2");
845
