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>"
60 #define OTI6858_VERSION "0.2"
62 static const struct usb_device_id id_table[] = {
63 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
67 MODULE_DEVICE_TABLE(usb, id_table);
70 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
71 #define OTI6858_REQ_T_GET_STATUS 0x01
73 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
74 #define OTI6858_REQ_T_SET_LINE 0x00
76 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
77 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00
79 /* format of the control packet */
80 struct oti6858_control_pkt {
81 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */
82 #define OTI6858_MAX_BAUD_RATE 3000000
84 #define FMT_STOP_BITS_MASK 0xc0
85 #define FMT_STOP_BITS_1 0x00
86 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */
87 #define FMT_PARITY_MASK 0x38
88 #define FMT_PARITY_NONE 0x00
89 #define FMT_PARITY_ODD 0x08
90 #define FMT_PARITY_EVEN 0x18
91 #define FMT_PARITY_MARK 0x28
92 #define FMT_PARITY_SPACE 0x38
93 #define FMT_DATA_BITS_MASK 0x03
94 #define FMT_DATA_BITS_5 0x00
95 #define FMT_DATA_BITS_6 0x01
96 #define FMT_DATA_BITS_7 0x02
97 #define FMT_DATA_BITS_8 0x03
98 u8 something; /* always equals 0x43 */
99 u8 control; /* settings of flow control lines */
100 #define CONTROL_MASK 0x0c
101 #define CONTROL_DTR_HIGH 0x08
102 #define CONTROL_RTS_HIGH 0x04
104 #define TX_BUFFER_EMPTIED 0x09
106 #define PIN_MASK 0x3f
107 #define PIN_RTS 0x20 /* output pin */
108 #define PIN_CTS 0x10 /* input pin, active low */
109 #define PIN_DSR 0x08 /* input pin, active low */
110 #define PIN_DTR 0x04 /* output pin */
111 #define PIN_RI 0x02 /* input pin, active low */
112 #define PIN_DCD 0x01 /* input pin, active low */
113 u8 rx_bytes_avail; /* number of bytes in rx buffer */;
116 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
117 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
118 (((a)->divisor == (priv)->pending_setup.divisor) \
119 && ((a)->control == (priv)->pending_setup.control) \
120 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
122 /* function prototypes */
123 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
124 static void oti6858_close(struct usb_serial_port *port);
125 static void oti6858_set_termios(struct tty_struct *tty,
126 struct usb_serial_port *port, struct ktermios *old);
127 static void oti6858_init_termios(struct tty_struct *tty);
128 static int oti6858_ioctl(struct tty_struct *tty,
129 unsigned int cmd, unsigned long arg);
130 static void oti6858_read_int_callback(struct urb *urb);
131 static void oti6858_read_bulk_callback(struct urb *urb);
132 static void oti6858_write_bulk_callback(struct urb *urb);
133 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
134 const unsigned char *buf, int count);
135 static int oti6858_write_room(struct tty_struct *tty);
136 static int oti6858_chars_in_buffer(struct tty_struct *tty);
137 static int oti6858_tiocmget(struct tty_struct *tty);
138 static int oti6858_tiocmset(struct tty_struct *tty,
139 unsigned int set, unsigned int clear);
140 static int oti6858_port_probe(struct usb_serial_port *port);
141 static int oti6858_port_remove(struct usb_serial_port *port);
144 static struct usb_serial_driver oti6858_device = {
146 .owner = THIS_MODULE,
149 .id_table = id_table,
151 .open = oti6858_open,
152 .close = oti6858_close,
153 .write = oti6858_write,
154 .ioctl = oti6858_ioctl,
155 .set_termios = oti6858_set_termios,
156 .init_termios = oti6858_init_termios,
157 .tiocmget = oti6858_tiocmget,
158 .tiocmset = oti6858_tiocmset,
159 .read_bulk_callback = oti6858_read_bulk_callback,
160 .read_int_callback = oti6858_read_int_callback,
161 .write_bulk_callback = oti6858_write_bulk_callback,
162 .write_room = oti6858_write_room,
163 .chars_in_buffer = oti6858_chars_in_buffer,
164 .port_probe = oti6858_port_probe,
165 .port_remove = oti6858_port_remove,
168 static struct usb_serial_driver * const serial_drivers[] = {
169 &oti6858_device, NULL
172 struct oti6858_private {
175 struct oti6858_control_pkt status;
181 struct delayed_work delayed_write_work;
190 struct delayed_work delayed_setup_work;
192 wait_queue_head_t intr_wait;
193 struct usb_serial_port *port; /* USB port with which associated */
196 static void setup_line(struct work_struct *work)
198 struct oti6858_private *priv = container_of(work,
199 struct oti6858_private, delayed_setup_work.work);
200 struct usb_serial_port *port = priv->port;
201 struct oti6858_control_pkt *new_setup;
205 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
206 if (new_setup == NULL) {
207 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
208 /* we will try again */
209 schedule_delayed_work(&priv->delayed_setup_work,
210 msecs_to_jiffies(2));
214 result = usb_control_msg(port->serial->dev,
215 usb_rcvctrlpipe(port->serial->dev, 0),
216 OTI6858_REQ_T_GET_STATUS,
217 OTI6858_REQ_GET_STATUS,
219 new_setup, OTI6858_CTRL_PKT_SIZE,
222 if (result != OTI6858_CTRL_PKT_SIZE) {
223 dev_err(&port->dev, "%s(): error reading status\n", __func__);
225 /* we will try again */
226 schedule_delayed_work(&priv->delayed_setup_work,
227 msecs_to_jiffies(2));
231 spin_lock_irqsave(&priv->lock, flags);
232 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
233 new_setup->divisor = priv->pending_setup.divisor;
234 new_setup->control = priv->pending_setup.control;
235 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
237 spin_unlock_irqrestore(&priv->lock, flags);
238 result = usb_control_msg(port->serial->dev,
239 usb_sndctrlpipe(port->serial->dev, 0),
240 OTI6858_REQ_T_SET_LINE,
241 OTI6858_REQ_SET_LINE,
243 new_setup, OTI6858_CTRL_PKT_SIZE,
246 spin_unlock_irqrestore(&priv->lock, flags);
251 spin_lock_irqsave(&priv->lock, flags);
252 if (result != OTI6858_CTRL_PKT_SIZE)
254 priv->setup_done = 1;
255 spin_unlock_irqrestore(&priv->lock, flags);
257 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
258 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
260 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
265 static void send_data(struct work_struct *work)
267 struct oti6858_private *priv = container_of(work,
268 struct oti6858_private, delayed_write_work.work);
269 struct usb_serial_port *port = priv->port;
270 int count = 0, result;
274 spin_lock_irqsave(&priv->lock, flags);
275 if (priv->flags.write_urb_in_use) {
276 spin_unlock_irqrestore(&priv->lock, flags);
277 schedule_delayed_work(&priv->delayed_write_work,
278 msecs_to_jiffies(2));
281 priv->flags.write_urb_in_use = 1;
282 spin_unlock_irqrestore(&priv->lock, flags);
284 spin_lock_irqsave(&port->lock, flags);
285 count = kfifo_len(&port->write_fifo);
286 spin_unlock_irqrestore(&port->lock, flags);
288 if (count > port->bulk_out_size)
289 count = port->bulk_out_size;
292 allow = kmalloc(1, GFP_KERNEL);
294 dev_err_console(port, "%s(): kmalloc failed\n",
298 result = usb_control_msg(port->serial->dev,
299 usb_rcvctrlpipe(port->serial->dev, 0),
300 OTI6858_REQ_T_CHECK_TXBUFF,
301 OTI6858_REQ_CHECK_TXBUFF,
302 count, 0, allow, 1, 100);
303 if (result != 1 || *allow != 0)
309 priv->flags.write_urb_in_use = 0;
311 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
312 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
314 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
320 count = kfifo_out_locked(&port->write_fifo,
321 port->write_urb->transfer_buffer,
323 port->write_urb->transfer_buffer_length = count;
324 result = usb_submit_urb(port->write_urb, GFP_NOIO);
326 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
328 priv->flags.write_urb_in_use = 0;
331 usb_serial_port_softint(port);
334 static int oti6858_port_probe(struct usb_serial_port *port)
336 struct oti6858_private *priv;
338 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
342 spin_lock_init(&priv->lock);
343 init_waitqueue_head(&priv->intr_wait);
345 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
346 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
348 usb_set_serial_port_data(port, priv);
353 static int oti6858_port_remove(struct usb_serial_port *port)
355 struct oti6858_private *priv;
357 priv = usb_get_serial_port_data(port);
363 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
364 const unsigned char *buf, int count)
369 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
374 static int oti6858_write_room(struct tty_struct *tty)
376 struct usb_serial_port *port = tty->driver_data;
380 spin_lock_irqsave(&port->lock, flags);
381 room = kfifo_avail(&port->write_fifo);
382 spin_unlock_irqrestore(&port->lock, flags);
387 static int oti6858_chars_in_buffer(struct tty_struct *tty)
389 struct usb_serial_port *port = tty->driver_data;
393 spin_lock_irqsave(&port->lock, flags);
394 chars = kfifo_len(&port->write_fifo);
395 spin_unlock_irqrestore(&port->lock, flags);
400 static void oti6858_init_termios(struct tty_struct *tty)
402 tty->termios = tty_std_termios;
403 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
404 tty->termios.c_ispeed = 38400;
405 tty->termios.c_ospeed = 38400;
408 static void oti6858_set_termios(struct tty_struct *tty,
409 struct usb_serial_port *port, struct ktermios *old_termios)
411 struct oti6858_private *priv = usb_get_serial_port_data(port);
414 u8 frame_fmt, control;
421 cflag = tty->termios.c_cflag;
423 spin_lock_irqsave(&priv->lock, flags);
424 divisor = priv->pending_setup.divisor;
425 frame_fmt = priv->pending_setup.frame_fmt;
426 control = priv->pending_setup.control;
427 spin_unlock_irqrestore(&priv->lock, flags);
429 frame_fmt &= ~FMT_DATA_BITS_MASK;
430 switch (cflag & CSIZE) {
432 frame_fmt |= FMT_DATA_BITS_5;
435 frame_fmt |= FMT_DATA_BITS_6;
438 frame_fmt |= FMT_DATA_BITS_7;
442 frame_fmt |= FMT_DATA_BITS_8;
446 /* manufacturer claims that this device can work with baud rates
447 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
448 * guarantee that any other baud rate will work (especially
451 br = tty_get_baud_rate(tty);
457 br = min(br, OTI6858_MAX_BAUD_RATE);
459 new_divisor = (96000000 + 8 * br) / (16 * br);
460 real_br = 96000000 / (16 * new_divisor);
461 divisor = cpu_to_le16(new_divisor);
462 tty_encode_baud_rate(tty, real_br, real_br);
465 frame_fmt &= ~FMT_STOP_BITS_MASK;
466 if ((cflag & CSTOPB) != 0)
467 frame_fmt |= FMT_STOP_BITS_2;
469 frame_fmt |= FMT_STOP_BITS_1;
471 frame_fmt &= ~FMT_PARITY_MASK;
472 if ((cflag & PARENB) != 0) {
473 if ((cflag & PARODD) != 0)
474 frame_fmt |= FMT_PARITY_ODD;
476 frame_fmt |= FMT_PARITY_EVEN;
478 frame_fmt |= FMT_PARITY_NONE;
481 control &= ~CONTROL_MASK;
482 if ((cflag & CRTSCTS) != 0)
483 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
485 /* change control lines if we are switching to or from B0 */
487 spin_lock_irqsave(&priv->lock, flags);
488 control = priv->line_control;
489 if ((cflag & CBAUD) == B0)
490 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
492 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
493 if (control != priv->line_control) {
494 control = priv->line_control;
495 spin_unlock_irqrestore(&priv->lock, flags);
496 set_control_lines(serial->dev, control);
498 spin_unlock_irqrestore(&priv->lock, flags);
502 spin_lock_irqsave(&priv->lock, flags);
503 if (divisor != priv->pending_setup.divisor
504 || control != priv->pending_setup.control
505 || frame_fmt != priv->pending_setup.frame_fmt) {
506 priv->pending_setup.divisor = divisor;
507 priv->pending_setup.control = control;
508 priv->pending_setup.frame_fmt = frame_fmt;
510 spin_unlock_irqrestore(&priv->lock, flags);
513 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
515 struct oti6858_private *priv = usb_get_serial_port_data(port);
516 struct ktermios tmp_termios;
517 struct usb_serial *serial = port->serial;
518 struct oti6858_control_pkt *buf;
522 usb_clear_halt(serial->dev, port->write_urb->pipe);
523 usb_clear_halt(serial->dev, port->read_urb->pipe);
525 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
527 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
531 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
532 OTI6858_REQ_T_GET_STATUS,
533 OTI6858_REQ_GET_STATUS,
535 buf, OTI6858_CTRL_PKT_SIZE,
537 if (result != OTI6858_CTRL_PKT_SIZE) {
538 /* assume default (after power-on reset) values */
539 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
540 buf->frame_fmt = 0x03; /* 8N1 */
541 buf->something = 0x43;
542 buf->control = 0x4c; /* DTR, RTS */
543 buf->tx_status = 0x00;
544 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
545 buf->rx_bytes_avail = 0x00;
548 spin_lock_irqsave(&priv->lock, flags);
549 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
550 priv->pending_setup.divisor = buf->divisor;
551 priv->pending_setup.frame_fmt = buf->frame_fmt;
552 priv->pending_setup.control = buf->control;
553 spin_unlock_irqrestore(&priv->lock, flags);
556 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
557 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
559 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
567 oti6858_set_termios(tty, port, &tmp_termios);
568 port->port.drain_delay = 256; /* FIXME: check the FIFO length */
572 static void oti6858_close(struct usb_serial_port *port)
574 struct oti6858_private *priv = usb_get_serial_port_data(port);
577 spin_lock_irqsave(&port->lock, flags);
578 /* clear out any remaining data in the buffer */
579 kfifo_reset_out(&port->write_fifo);
580 spin_unlock_irqrestore(&port->lock, flags);
582 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
584 /* cancel scheduled setup */
585 cancel_delayed_work_sync(&priv->delayed_setup_work);
586 cancel_delayed_work_sync(&priv->delayed_write_work);
588 /* shutdown our urbs */
589 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
590 usb_kill_urb(port->write_urb);
591 usb_kill_urb(port->read_urb);
592 usb_kill_urb(port->interrupt_in_urb);
595 static int oti6858_tiocmset(struct tty_struct *tty,
596 unsigned int set, unsigned int clear)
598 struct usb_serial_port *port = tty->driver_data;
599 struct oti6858_private *priv = usb_get_serial_port_data(port);
603 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
604 __func__, set, clear);
606 /* FIXME: check if this is correct (active high/low) */
607 spin_lock_irqsave(&priv->lock, flags);
608 control = priv->pending_setup.control;
609 if ((set & TIOCM_RTS) != 0)
610 control |= CONTROL_RTS_HIGH;
611 if ((set & TIOCM_DTR) != 0)
612 control |= CONTROL_DTR_HIGH;
613 if ((clear & TIOCM_RTS) != 0)
614 control &= ~CONTROL_RTS_HIGH;
615 if ((clear & TIOCM_DTR) != 0)
616 control &= ~CONTROL_DTR_HIGH;
618 if (control != priv->pending_setup.control)
619 priv->pending_setup.control = control;
621 spin_unlock_irqrestore(&priv->lock, flags);
625 static int oti6858_tiocmget(struct tty_struct *tty)
627 struct usb_serial_port *port = tty->driver_data;
628 struct oti6858_private *priv = usb_get_serial_port_data(port);
633 spin_lock_irqsave(&priv->lock, flags);
634 pin_state = priv->status.pin_state & PIN_MASK;
635 spin_unlock_irqrestore(&priv->lock, flags);
637 /* FIXME: check if this is correct (active high/low) */
638 if ((pin_state & PIN_RTS) != 0)
640 if ((pin_state & PIN_CTS) != 0)
642 if ((pin_state & PIN_DSR) != 0)
644 if ((pin_state & PIN_DTR) != 0)
646 if ((pin_state & PIN_RI) != 0)
648 if ((pin_state & PIN_DCD) != 0)
651 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
656 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
658 struct oti6858_private *priv = usb_get_serial_port_data(port);
660 unsigned int prev, status;
661 unsigned int changed;
663 spin_lock_irqsave(&priv->lock, flags);
664 prev = priv->status.pin_state;
665 spin_unlock_irqrestore(&priv->lock, flags);
668 wait_event_interruptible(priv->intr_wait,
669 priv->status.pin_state != prev);
670 if (signal_pending(current))
673 spin_lock_irqsave(&priv->lock, flags);
674 status = priv->status.pin_state & PIN_MASK;
675 spin_unlock_irqrestore(&priv->lock, flags);
677 changed = prev ^ status;
678 /* FIXME: check if this is correct (active high/low) */
679 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) ||
680 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) ||
681 ((arg & TIOCM_CD) && (changed & PIN_DCD)) ||
682 ((arg & TIOCM_CTS) && (changed & PIN_CTS)))
691 static int oti6858_ioctl(struct tty_struct *tty,
692 unsigned int cmd, unsigned long arg)
694 struct usb_serial_port *port = tty->driver_data;
696 dev_dbg(&port->dev, "%s(cmd = 0x%04x, arg = 0x%08lx)\n", __func__, cmd, arg);
700 dev_dbg(&port->dev, "%s(): TIOCMIWAIT\n", __func__);
701 return wait_modem_info(port, arg);
703 dev_dbg(&port->dev, "%s(): 0x%04x not supported\n", __func__, cmd);
709 static void oti6858_read_int_callback(struct urb *urb)
711 struct usb_serial_port *port = urb->context;
712 struct oti6858_private *priv = usb_get_serial_port_data(port);
713 int transient = 0, can_recv = 0, resubmit = 1;
714 int status = urb->status;
723 /* this urb is terminated, clean up */
724 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
728 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
733 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
734 struct oti6858_control_pkt *xs = urb->transfer_buffer;
737 spin_lock_irqsave(&priv->lock, flags);
739 if (!priv->transient) {
740 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
741 if (xs->rx_bytes_avail == 0) {
743 priv->setup_done = 0;
745 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
746 schedule_delayed_work(&priv->delayed_setup_work, 0);
750 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
752 } else if (!priv->setup_done) {
754 } else if (--priv->transient == 0) {
755 if (xs->rx_bytes_avail == 0) {
757 priv->setup_done = 0;
759 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
760 schedule_delayed_work(&priv->delayed_setup_work, 0);
765 if (!priv->transient) {
766 if (xs->pin_state != priv->status.pin_state)
767 wake_up_interruptible(&priv->intr_wait);
768 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
771 if (!priv->transient && xs->rx_bytes_avail != 0) {
772 can_recv = xs->rx_bytes_avail;
773 priv->flags.read_urb_in_use = 1;
776 transient = priv->transient;
777 spin_unlock_irqrestore(&priv->lock, flags);
783 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
785 priv->flags.read_urb_in_use = 0;
786 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
787 " error %d\n", __func__, result);
791 } else if (!transient) {
795 spin_lock_irqsave(&port->lock, flags);
796 count = kfifo_len(&port->write_fifo);
797 spin_unlock_irqrestore(&port->lock, flags);
799 spin_lock_irqsave(&priv->lock, flags);
800 if (priv->flags.write_urb_in_use == 0 && count != 0) {
801 schedule_delayed_work(&priv->delayed_write_work, 0);
804 spin_unlock_irqrestore(&priv->lock, flags);
810 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */
811 result = usb_submit_urb(urb, GFP_ATOMIC);
813 dev_err(&urb->dev->dev,
814 "%s(): usb_submit_urb() failed with"
815 " error %d\n", __func__, result);
820 static void oti6858_read_bulk_callback(struct urb *urb)
822 struct usb_serial_port *port = urb->context;
823 struct oti6858_private *priv = usb_get_serial_port_data(port);
824 struct tty_struct *tty;
825 unsigned char *data = urb->transfer_buffer;
827 int status = urb->status;
830 spin_lock_irqsave(&priv->lock, flags);
831 priv->flags.read_urb_in_use = 0;
832 spin_unlock_irqrestore(&priv->lock, flags);
835 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
839 tty = tty_port_tty_get(&port->port);
840 if (tty != NULL && urb->actual_length > 0) {
841 tty_insert_flip_string(tty, data, urb->actual_length);
842 tty_flip_buffer_push(tty);
846 /* schedule the interrupt urb */
847 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
848 if (result != 0 && result != -EPERM) {
849 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
850 " error %d\n", __func__, result);
854 static void oti6858_write_bulk_callback(struct urb *urb)
856 struct usb_serial_port *port = urb->context;
857 struct oti6858_private *priv = usb_get_serial_port_data(port);
858 int status = urb->status;
868 /* this urb is terminated, clean up */
869 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
870 priv->flags.write_urb_in_use = 0;
873 /* error in the urb, so we have to resubmit it */
874 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
875 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
877 port->write_urb->transfer_buffer_length = 1;
878 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
880 dev_err_console(port, "%s(): usb_submit_urb() failed,"
881 " error %d\n", __func__, result);
887 priv->flags.write_urb_in_use = 0;
889 /* schedule the interrupt urb if we are still open */
890 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
891 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
893 dev_err(&port->dev, "%s(): failed submitting int urb,"
894 " error %d\n", __func__, result);
898 module_usb_serial_driver(serial_drivers, id_table);
900 MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
901 MODULE_AUTHOR(OTI6858_AUTHOR);
902 MODULE_VERSION(OTI6858_VERSION);
903 MODULE_LICENSE("GPL");