2 * Ours Technology Inc. OTi-6858 USB to serial adapter driver.
4 * Copyleft (C) 2007 Kees Lemmens (adapted for kernel 2.6.20)
5 * Copyright (C) 2006 Tomasz Michal Lukaszewski (FIXME: add e-mail)
6 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
7 * Copyright (C) 2003 IBM Corp.
9 * Many thanks to the authors of pl2303 driver: all functions in this file
10 * are heavily based on pl2303 code, buffering code is a 1-to-1 copy.
12 * Warning! You use this driver on your own risk! The only official
13 * description of this device I have is datasheet from manufacturer,
14 * and it doesn't contain almost any information needed to write a driver.
15 * Almost all knowlegde used while writing this driver was gathered by:
16 * - analyzing traffic between device and the M$ Windows 2000 driver,
17 * - trying different bit combinations and checking pin states
19 * - receiving malformed frames and producing buffer overflows
20 * to learn how errors are reported,
21 * So, THIS CODE CAN DESTROY OTi-6858 AND ANY OTHER DEVICES, THAT ARE
24 * This program is free software; you can redistribute it and/or modify
25 * it under the terms of the GNU General Public License as published by
26 * the Free Software Foundation; either version 2 of the License.
28 * See Documentation/usb/usb-serial.txt for more information on using this
32 * - implement correct flushing for ioctls and oti6858_close()
33 * - check how errors (rx overflow, parity error, framing error) are reported
34 * - implement oti6858_break_ctl()
35 * - implement more ioctls
36 * - test/implement flow control
37 * - allow setting custom baud rates
40 #include <linux/kernel.h>
41 #include <linux/errno.h>
42 #include <linux/init.h>
43 #include <linux/slab.h>
44 #include <linux/tty.h>
45 #include <linux/tty_driver.h>
46 #include <linux/tty_flip.h>
47 #include <linux/serial.h>
48 #include <linux/module.h>
49 #include <linux/moduleparam.h>
50 #include <linux/spinlock.h>
51 #include <linux/usb.h>
52 #include <linux/usb/serial.h>
53 #include <linux/uaccess.h>
54 #include <linux/kfifo.h>
57 #define OTI6858_DESCRIPTION \
58 "Ours Technology Inc. OTi-6858 USB to serial adapter driver"
59 #define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
61 static const struct usb_device_id id_table[] = {
62 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
66 MODULE_DEVICE_TABLE(usb, id_table);
69 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
70 #define OTI6858_REQ_T_GET_STATUS 0x01
72 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
73 #define OTI6858_REQ_T_SET_LINE 0x00
75 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
76 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00
78 /* format of the control packet */
79 struct oti6858_control_pkt {
80 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */
81 #define OTI6858_MAX_BAUD_RATE 3000000
83 #define FMT_STOP_BITS_MASK 0xc0
84 #define FMT_STOP_BITS_1 0x00
85 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */
86 #define FMT_PARITY_MASK 0x38
87 #define FMT_PARITY_NONE 0x00
88 #define FMT_PARITY_ODD 0x08
89 #define FMT_PARITY_EVEN 0x18
90 #define FMT_PARITY_MARK 0x28
91 #define FMT_PARITY_SPACE 0x38
92 #define FMT_DATA_BITS_MASK 0x03
93 #define FMT_DATA_BITS_5 0x00
94 #define FMT_DATA_BITS_6 0x01
95 #define FMT_DATA_BITS_7 0x02
96 #define FMT_DATA_BITS_8 0x03
97 u8 something; /* always equals 0x43 */
98 u8 control; /* settings of flow control lines */
99 #define CONTROL_MASK 0x0c
100 #define CONTROL_DTR_HIGH 0x08
101 #define CONTROL_RTS_HIGH 0x04
103 #define TX_BUFFER_EMPTIED 0x09
105 #define PIN_MASK 0x3f
106 #define PIN_RTS 0x20 /* output pin */
107 #define PIN_CTS 0x10 /* input pin, active low */
108 #define PIN_DSR 0x08 /* input pin, active low */
109 #define PIN_DTR 0x04 /* output pin */
110 #define PIN_RI 0x02 /* input pin, active low */
111 #define PIN_DCD 0x01 /* input pin, active low */
112 u8 rx_bytes_avail; /* number of bytes in rx buffer */;
115 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
116 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
117 (((a)->divisor == (priv)->pending_setup.divisor) \
118 && ((a)->control == (priv)->pending_setup.control) \
119 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
121 /* function prototypes */
122 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
123 static void oti6858_close(struct usb_serial_port *port);
124 static void oti6858_set_termios(struct tty_struct *tty,
125 struct usb_serial_port *port, struct ktermios *old);
126 static void oti6858_init_termios(struct tty_struct *tty);
127 static int oti6858_ioctl(struct tty_struct *tty,
128 unsigned int cmd, unsigned long arg);
129 static void oti6858_read_int_callback(struct urb *urb);
130 static void oti6858_read_bulk_callback(struct urb *urb);
131 static void oti6858_write_bulk_callback(struct urb *urb);
132 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
133 const unsigned char *buf, int count);
134 static int oti6858_write_room(struct tty_struct *tty);
135 static int oti6858_chars_in_buffer(struct tty_struct *tty);
136 static int oti6858_tiocmget(struct tty_struct *tty);
137 static int oti6858_tiocmset(struct tty_struct *tty,
138 unsigned int set, unsigned int clear);
139 static int oti6858_port_probe(struct usb_serial_port *port);
140 static int oti6858_port_remove(struct usb_serial_port *port);
143 static struct usb_serial_driver oti6858_device = {
145 .owner = THIS_MODULE,
148 .id_table = id_table,
150 .open = oti6858_open,
151 .close = oti6858_close,
152 .write = oti6858_write,
153 .ioctl = oti6858_ioctl,
154 .set_termios = oti6858_set_termios,
155 .init_termios = oti6858_init_termios,
156 .tiocmget = oti6858_tiocmget,
157 .tiocmset = oti6858_tiocmset,
158 .read_bulk_callback = oti6858_read_bulk_callback,
159 .read_int_callback = oti6858_read_int_callback,
160 .write_bulk_callback = oti6858_write_bulk_callback,
161 .write_room = oti6858_write_room,
162 .chars_in_buffer = oti6858_chars_in_buffer,
163 .port_probe = oti6858_port_probe,
164 .port_remove = oti6858_port_remove,
167 static struct usb_serial_driver * const serial_drivers[] = {
168 &oti6858_device, NULL
171 struct oti6858_private {
174 struct oti6858_control_pkt status;
180 struct delayed_work delayed_write_work;
189 struct delayed_work delayed_setup_work;
191 wait_queue_head_t intr_wait;
192 struct usb_serial_port *port; /* USB port with which associated */
195 static void setup_line(struct work_struct *work)
197 struct oti6858_private *priv = container_of(work,
198 struct oti6858_private, delayed_setup_work.work);
199 struct usb_serial_port *port = priv->port;
200 struct oti6858_control_pkt *new_setup;
204 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
205 if (new_setup == NULL) {
206 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
207 /* we will try again */
208 schedule_delayed_work(&priv->delayed_setup_work,
209 msecs_to_jiffies(2));
213 result = usb_control_msg(port->serial->dev,
214 usb_rcvctrlpipe(port->serial->dev, 0),
215 OTI6858_REQ_T_GET_STATUS,
216 OTI6858_REQ_GET_STATUS,
218 new_setup, OTI6858_CTRL_PKT_SIZE,
221 if (result != OTI6858_CTRL_PKT_SIZE) {
222 dev_err(&port->dev, "%s(): error reading status\n", __func__);
224 /* we will try again */
225 schedule_delayed_work(&priv->delayed_setup_work,
226 msecs_to_jiffies(2));
230 spin_lock_irqsave(&priv->lock, flags);
231 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
232 new_setup->divisor = priv->pending_setup.divisor;
233 new_setup->control = priv->pending_setup.control;
234 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
236 spin_unlock_irqrestore(&priv->lock, flags);
237 result = usb_control_msg(port->serial->dev,
238 usb_sndctrlpipe(port->serial->dev, 0),
239 OTI6858_REQ_T_SET_LINE,
240 OTI6858_REQ_SET_LINE,
242 new_setup, OTI6858_CTRL_PKT_SIZE,
245 spin_unlock_irqrestore(&priv->lock, flags);
250 spin_lock_irqsave(&priv->lock, flags);
251 if (result != OTI6858_CTRL_PKT_SIZE)
253 priv->setup_done = 1;
254 spin_unlock_irqrestore(&priv->lock, flags);
256 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
257 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
259 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
264 static void send_data(struct work_struct *work)
266 struct oti6858_private *priv = container_of(work,
267 struct oti6858_private, delayed_write_work.work);
268 struct usb_serial_port *port = priv->port;
269 int count = 0, result;
273 spin_lock_irqsave(&priv->lock, flags);
274 if (priv->flags.write_urb_in_use) {
275 spin_unlock_irqrestore(&priv->lock, flags);
276 schedule_delayed_work(&priv->delayed_write_work,
277 msecs_to_jiffies(2));
280 priv->flags.write_urb_in_use = 1;
281 spin_unlock_irqrestore(&priv->lock, flags);
283 spin_lock_irqsave(&port->lock, flags);
284 count = kfifo_len(&port->write_fifo);
285 spin_unlock_irqrestore(&port->lock, flags);
287 if (count > port->bulk_out_size)
288 count = port->bulk_out_size;
291 allow = kmalloc(1, GFP_KERNEL);
293 dev_err_console(port, "%s(): kmalloc failed\n",
297 result = usb_control_msg(port->serial->dev,
298 usb_rcvctrlpipe(port->serial->dev, 0),
299 OTI6858_REQ_T_CHECK_TXBUFF,
300 OTI6858_REQ_CHECK_TXBUFF,
301 count, 0, allow, 1, 100);
302 if (result != 1 || *allow != 0)
308 priv->flags.write_urb_in_use = 0;
310 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
311 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
313 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
319 count = kfifo_out_locked(&port->write_fifo,
320 port->write_urb->transfer_buffer,
322 port->write_urb->transfer_buffer_length = count;
323 result = usb_submit_urb(port->write_urb, GFP_NOIO);
325 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
327 priv->flags.write_urb_in_use = 0;
330 usb_serial_port_softint(port);
333 static int oti6858_port_probe(struct usb_serial_port *port)
335 struct oti6858_private *priv;
337 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
341 spin_lock_init(&priv->lock);
342 init_waitqueue_head(&priv->intr_wait);
344 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
345 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
347 usb_set_serial_port_data(port, priv);
352 static int oti6858_port_remove(struct usb_serial_port *port)
354 struct oti6858_private *priv;
356 priv = usb_get_serial_port_data(port);
362 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
363 const unsigned char *buf, int count)
368 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
373 static int oti6858_write_room(struct tty_struct *tty)
375 struct usb_serial_port *port = tty->driver_data;
379 spin_lock_irqsave(&port->lock, flags);
380 room = kfifo_avail(&port->write_fifo);
381 spin_unlock_irqrestore(&port->lock, flags);
386 static int oti6858_chars_in_buffer(struct tty_struct *tty)
388 struct usb_serial_port *port = tty->driver_data;
392 spin_lock_irqsave(&port->lock, flags);
393 chars = kfifo_len(&port->write_fifo);
394 spin_unlock_irqrestore(&port->lock, flags);
399 static void oti6858_init_termios(struct tty_struct *tty)
401 tty->termios = tty_std_termios;
402 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
403 tty->termios.c_ispeed = 38400;
404 tty->termios.c_ospeed = 38400;
407 static void oti6858_set_termios(struct tty_struct *tty,
408 struct usb_serial_port *port, struct ktermios *old_termios)
410 struct oti6858_private *priv = usb_get_serial_port_data(port);
413 u8 frame_fmt, control;
420 cflag = tty->termios.c_cflag;
422 spin_lock_irqsave(&priv->lock, flags);
423 divisor = priv->pending_setup.divisor;
424 frame_fmt = priv->pending_setup.frame_fmt;
425 control = priv->pending_setup.control;
426 spin_unlock_irqrestore(&priv->lock, flags);
428 frame_fmt &= ~FMT_DATA_BITS_MASK;
429 switch (cflag & CSIZE) {
431 frame_fmt |= FMT_DATA_BITS_5;
434 frame_fmt |= FMT_DATA_BITS_6;
437 frame_fmt |= FMT_DATA_BITS_7;
441 frame_fmt |= FMT_DATA_BITS_8;
445 /* manufacturer claims that this device can work with baud rates
446 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
447 * guarantee that any other baud rate will work (especially
450 br = tty_get_baud_rate(tty);
456 br = min(br, OTI6858_MAX_BAUD_RATE);
458 new_divisor = (96000000 + 8 * br) / (16 * br);
459 real_br = 96000000 / (16 * new_divisor);
460 divisor = cpu_to_le16(new_divisor);
461 tty_encode_baud_rate(tty, real_br, real_br);
464 frame_fmt &= ~FMT_STOP_BITS_MASK;
465 if ((cflag & CSTOPB) != 0)
466 frame_fmt |= FMT_STOP_BITS_2;
468 frame_fmt |= FMT_STOP_BITS_1;
470 frame_fmt &= ~FMT_PARITY_MASK;
471 if ((cflag & PARENB) != 0) {
472 if ((cflag & PARODD) != 0)
473 frame_fmt |= FMT_PARITY_ODD;
475 frame_fmt |= FMT_PARITY_EVEN;
477 frame_fmt |= FMT_PARITY_NONE;
480 control &= ~CONTROL_MASK;
481 if ((cflag & CRTSCTS) != 0)
482 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
484 /* change control lines if we are switching to or from B0 */
486 spin_lock_irqsave(&priv->lock, flags);
487 control = priv->line_control;
488 if ((cflag & CBAUD) == B0)
489 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
491 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
492 if (control != priv->line_control) {
493 control = priv->line_control;
494 spin_unlock_irqrestore(&priv->lock, flags);
495 set_control_lines(serial->dev, control);
497 spin_unlock_irqrestore(&priv->lock, flags);
501 spin_lock_irqsave(&priv->lock, flags);
502 if (divisor != priv->pending_setup.divisor
503 || control != priv->pending_setup.control
504 || frame_fmt != priv->pending_setup.frame_fmt) {
505 priv->pending_setup.divisor = divisor;
506 priv->pending_setup.control = control;
507 priv->pending_setup.frame_fmt = frame_fmt;
509 spin_unlock_irqrestore(&priv->lock, flags);
512 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
514 struct oti6858_private *priv = usb_get_serial_port_data(port);
515 struct ktermios tmp_termios;
516 struct usb_serial *serial = port->serial;
517 struct oti6858_control_pkt *buf;
521 usb_clear_halt(serial->dev, port->write_urb->pipe);
522 usb_clear_halt(serial->dev, port->read_urb->pipe);
524 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
526 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
530 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
531 OTI6858_REQ_T_GET_STATUS,
532 OTI6858_REQ_GET_STATUS,
534 buf, OTI6858_CTRL_PKT_SIZE,
536 if (result != OTI6858_CTRL_PKT_SIZE) {
537 /* assume default (after power-on reset) values */
538 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
539 buf->frame_fmt = 0x03; /* 8N1 */
540 buf->something = 0x43;
541 buf->control = 0x4c; /* DTR, RTS */
542 buf->tx_status = 0x00;
543 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
544 buf->rx_bytes_avail = 0x00;
547 spin_lock_irqsave(&priv->lock, flags);
548 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
549 priv->pending_setup.divisor = buf->divisor;
550 priv->pending_setup.frame_fmt = buf->frame_fmt;
551 priv->pending_setup.control = buf->control;
552 spin_unlock_irqrestore(&priv->lock, flags);
555 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
556 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
558 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
566 oti6858_set_termios(tty, port, &tmp_termios);
567 port->port.drain_delay = 256; /* FIXME: check the FIFO length */
571 static void oti6858_close(struct usb_serial_port *port)
573 struct oti6858_private *priv = usb_get_serial_port_data(port);
576 spin_lock_irqsave(&port->lock, flags);
577 /* clear out any remaining data in the buffer */
578 kfifo_reset_out(&port->write_fifo);
579 spin_unlock_irqrestore(&port->lock, flags);
581 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
583 /* cancel scheduled setup */
584 cancel_delayed_work_sync(&priv->delayed_setup_work);
585 cancel_delayed_work_sync(&priv->delayed_write_work);
587 /* shutdown our urbs */
588 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
589 usb_kill_urb(port->write_urb);
590 usb_kill_urb(port->read_urb);
591 usb_kill_urb(port->interrupt_in_urb);
594 static int oti6858_tiocmset(struct tty_struct *tty,
595 unsigned int set, unsigned int clear)
597 struct usb_serial_port *port = tty->driver_data;
598 struct oti6858_private *priv = usb_get_serial_port_data(port);
602 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
603 __func__, set, clear);
605 /* FIXME: check if this is correct (active high/low) */
606 spin_lock_irqsave(&priv->lock, flags);
607 control = priv->pending_setup.control;
608 if ((set & TIOCM_RTS) != 0)
609 control |= CONTROL_RTS_HIGH;
610 if ((set & TIOCM_DTR) != 0)
611 control |= CONTROL_DTR_HIGH;
612 if ((clear & TIOCM_RTS) != 0)
613 control &= ~CONTROL_RTS_HIGH;
614 if ((clear & TIOCM_DTR) != 0)
615 control &= ~CONTROL_DTR_HIGH;
617 if (control != priv->pending_setup.control)
618 priv->pending_setup.control = control;
620 spin_unlock_irqrestore(&priv->lock, flags);
624 static int oti6858_tiocmget(struct tty_struct *tty)
626 struct usb_serial_port *port = tty->driver_data;
627 struct oti6858_private *priv = usb_get_serial_port_data(port);
632 spin_lock_irqsave(&priv->lock, flags);
633 pin_state = priv->status.pin_state & PIN_MASK;
634 spin_unlock_irqrestore(&priv->lock, flags);
636 /* FIXME: check if this is correct (active high/low) */
637 if ((pin_state & PIN_RTS) != 0)
639 if ((pin_state & PIN_CTS) != 0)
641 if ((pin_state & PIN_DSR) != 0)
643 if ((pin_state & PIN_DTR) != 0)
645 if ((pin_state & PIN_RI) != 0)
647 if ((pin_state & PIN_DCD) != 0)
650 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
655 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
657 struct oti6858_private *priv = usb_get_serial_port_data(port);
659 unsigned int prev, status;
660 unsigned int changed;
662 spin_lock_irqsave(&priv->lock, flags);
663 prev = priv->status.pin_state;
664 spin_unlock_irqrestore(&priv->lock, flags);
667 wait_event_interruptible(priv->intr_wait,
668 priv->status.pin_state != prev);
669 if (signal_pending(current))
672 spin_lock_irqsave(&priv->lock, flags);
673 status = priv->status.pin_state & PIN_MASK;
674 spin_unlock_irqrestore(&priv->lock, flags);
676 changed = prev ^ status;
677 /* FIXME: check if this is correct (active high/low) */
678 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) ||
679 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) ||
680 ((arg & TIOCM_CD) && (changed & PIN_DCD)) ||
681 ((arg & TIOCM_CTS) && (changed & PIN_CTS)))
690 static int oti6858_ioctl(struct tty_struct *tty,
691 unsigned int cmd, unsigned long arg)
693 struct usb_serial_port *port = tty->driver_data;
695 dev_dbg(&port->dev, "%s(cmd = 0x%04x, arg = 0x%08lx)\n", __func__, cmd, arg);
699 dev_dbg(&port->dev, "%s(): TIOCMIWAIT\n", __func__);
700 return wait_modem_info(port, arg);
702 dev_dbg(&port->dev, "%s(): 0x%04x not supported\n", __func__, cmd);
708 static void oti6858_read_int_callback(struct urb *urb)
710 struct usb_serial_port *port = urb->context;
711 struct oti6858_private *priv = usb_get_serial_port_data(port);
712 int transient = 0, can_recv = 0, resubmit = 1;
713 int status = urb->status;
722 /* this urb is terminated, clean up */
723 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
727 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
732 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
733 struct oti6858_control_pkt *xs = urb->transfer_buffer;
736 spin_lock_irqsave(&priv->lock, flags);
738 if (!priv->transient) {
739 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
740 if (xs->rx_bytes_avail == 0) {
742 priv->setup_done = 0;
744 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
745 schedule_delayed_work(&priv->delayed_setup_work, 0);
749 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
751 } else if (!priv->setup_done) {
753 } else if (--priv->transient == 0) {
754 if (xs->rx_bytes_avail == 0) {
756 priv->setup_done = 0;
758 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
759 schedule_delayed_work(&priv->delayed_setup_work, 0);
764 if (!priv->transient) {
765 if (xs->pin_state != priv->status.pin_state)
766 wake_up_interruptible(&priv->intr_wait);
767 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
770 if (!priv->transient && xs->rx_bytes_avail != 0) {
771 can_recv = xs->rx_bytes_avail;
772 priv->flags.read_urb_in_use = 1;
775 transient = priv->transient;
776 spin_unlock_irqrestore(&priv->lock, flags);
782 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
784 priv->flags.read_urb_in_use = 0;
785 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
786 " error %d\n", __func__, result);
790 } else if (!transient) {
794 spin_lock_irqsave(&port->lock, flags);
795 count = kfifo_len(&port->write_fifo);
796 spin_unlock_irqrestore(&port->lock, flags);
798 spin_lock_irqsave(&priv->lock, flags);
799 if (priv->flags.write_urb_in_use == 0 && count != 0) {
800 schedule_delayed_work(&priv->delayed_write_work, 0);
803 spin_unlock_irqrestore(&priv->lock, flags);
809 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */
810 result = usb_submit_urb(urb, GFP_ATOMIC);
812 dev_err(&urb->dev->dev,
813 "%s(): usb_submit_urb() failed with"
814 " error %d\n", __func__, result);
819 static void oti6858_read_bulk_callback(struct urb *urb)
821 struct usb_serial_port *port = urb->context;
822 struct oti6858_private *priv = usb_get_serial_port_data(port);
823 struct tty_struct *tty;
824 unsigned char *data = urb->transfer_buffer;
826 int status = urb->status;
829 spin_lock_irqsave(&priv->lock, flags);
830 priv->flags.read_urb_in_use = 0;
831 spin_unlock_irqrestore(&priv->lock, flags);
834 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
838 tty = tty_port_tty_get(&port->port);
839 if (tty != NULL && urb->actual_length > 0) {
840 tty_insert_flip_string(tty, data, urb->actual_length);
841 tty_flip_buffer_push(tty);
845 /* schedule the interrupt urb */
846 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
847 if (result != 0 && result != -EPERM) {
848 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
849 " error %d\n", __func__, result);
853 static void oti6858_write_bulk_callback(struct urb *urb)
855 struct usb_serial_port *port = urb->context;
856 struct oti6858_private *priv = usb_get_serial_port_data(port);
857 int status = urb->status;
867 /* this urb is terminated, clean up */
868 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
869 priv->flags.write_urb_in_use = 0;
872 /* error in the urb, so we have to resubmit it */
873 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
874 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
876 port->write_urb->transfer_buffer_length = 1;
877 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
879 dev_err_console(port, "%s(): usb_submit_urb() failed,"
880 " error %d\n", __func__, result);
886 priv->flags.write_urb_in_use = 0;
888 /* schedule the interrupt urb if we are still open */
889 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
890 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
892 dev_err(&port->dev, "%s(): failed submitting int urb,"
893 " error %d\n", __func__, result);
897 module_usb_serial_driver(serial_drivers, id_table);
899 MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
900 MODULE_AUTHOR(OTI6858_AUTHOR);
901 MODULE_LICENSE("GPL");