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 struct usb_serial_port *port; /* USB port with which associated */
194 static void setup_line(struct work_struct *work)
196 struct oti6858_private *priv = container_of(work,
197 struct oti6858_private, delayed_setup_work.work);
198 struct usb_serial_port *port = priv->port;
199 struct oti6858_control_pkt *new_setup;
203 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
204 if (new_setup == NULL) {
205 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
206 /* we will try again */
207 schedule_delayed_work(&priv->delayed_setup_work,
208 msecs_to_jiffies(2));
212 result = usb_control_msg(port->serial->dev,
213 usb_rcvctrlpipe(port->serial->dev, 0),
214 OTI6858_REQ_T_GET_STATUS,
215 OTI6858_REQ_GET_STATUS,
217 new_setup, OTI6858_CTRL_PKT_SIZE,
220 if (result != OTI6858_CTRL_PKT_SIZE) {
221 dev_err(&port->dev, "%s(): error reading status\n", __func__);
223 /* we will try again */
224 schedule_delayed_work(&priv->delayed_setup_work,
225 msecs_to_jiffies(2));
229 spin_lock_irqsave(&priv->lock, flags);
230 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
231 new_setup->divisor = priv->pending_setup.divisor;
232 new_setup->control = priv->pending_setup.control;
233 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
235 spin_unlock_irqrestore(&priv->lock, flags);
236 result = usb_control_msg(port->serial->dev,
237 usb_sndctrlpipe(port->serial->dev, 0),
238 OTI6858_REQ_T_SET_LINE,
239 OTI6858_REQ_SET_LINE,
241 new_setup, OTI6858_CTRL_PKT_SIZE,
244 spin_unlock_irqrestore(&priv->lock, flags);
249 spin_lock_irqsave(&priv->lock, flags);
250 if (result != OTI6858_CTRL_PKT_SIZE)
252 priv->setup_done = 1;
253 spin_unlock_irqrestore(&priv->lock, flags);
255 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
256 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
258 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
263 static void send_data(struct work_struct *work)
265 struct oti6858_private *priv = container_of(work,
266 struct oti6858_private, delayed_write_work.work);
267 struct usb_serial_port *port = priv->port;
268 int count = 0, result;
272 spin_lock_irqsave(&priv->lock, flags);
273 if (priv->flags.write_urb_in_use) {
274 spin_unlock_irqrestore(&priv->lock, flags);
275 schedule_delayed_work(&priv->delayed_write_work,
276 msecs_to_jiffies(2));
279 priv->flags.write_urb_in_use = 1;
280 spin_unlock_irqrestore(&priv->lock, flags);
282 spin_lock_irqsave(&port->lock, flags);
283 count = kfifo_len(&port->write_fifo);
284 spin_unlock_irqrestore(&port->lock, flags);
286 if (count > port->bulk_out_size)
287 count = port->bulk_out_size;
290 allow = kmalloc(1, GFP_KERNEL);
292 dev_err_console(port, "%s(): kmalloc failed\n",
296 result = usb_control_msg(port->serial->dev,
297 usb_rcvctrlpipe(port->serial->dev, 0),
298 OTI6858_REQ_T_CHECK_TXBUFF,
299 OTI6858_REQ_CHECK_TXBUFF,
300 count, 0, allow, 1, 100);
301 if (result != 1 || *allow != 0)
307 priv->flags.write_urb_in_use = 0;
309 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
310 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
312 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
318 count = kfifo_out_locked(&port->write_fifo,
319 port->write_urb->transfer_buffer,
321 port->write_urb->transfer_buffer_length = count;
322 result = usb_submit_urb(port->write_urb, GFP_NOIO);
324 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
326 priv->flags.write_urb_in_use = 0;
329 usb_serial_port_softint(port);
332 static int oti6858_port_probe(struct usb_serial_port *port)
334 struct oti6858_private *priv;
336 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
340 spin_lock_init(&priv->lock);
342 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
343 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
345 usb_set_serial_port_data(port, priv);
350 static int oti6858_port_remove(struct usb_serial_port *port)
352 struct oti6858_private *priv;
354 priv = usb_get_serial_port_data(port);
360 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
361 const unsigned char *buf, int count)
366 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
371 static int oti6858_write_room(struct tty_struct *tty)
373 struct usb_serial_port *port = tty->driver_data;
377 spin_lock_irqsave(&port->lock, flags);
378 room = kfifo_avail(&port->write_fifo);
379 spin_unlock_irqrestore(&port->lock, flags);
384 static int oti6858_chars_in_buffer(struct tty_struct *tty)
386 struct usb_serial_port *port = tty->driver_data;
390 spin_lock_irqsave(&port->lock, flags);
391 chars = kfifo_len(&port->write_fifo);
392 spin_unlock_irqrestore(&port->lock, flags);
397 static void oti6858_init_termios(struct tty_struct *tty)
399 tty->termios = tty_std_termios;
400 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
401 tty->termios.c_ispeed = 38400;
402 tty->termios.c_ospeed = 38400;
405 static void oti6858_set_termios(struct tty_struct *tty,
406 struct usb_serial_port *port, struct ktermios *old_termios)
408 struct oti6858_private *priv = usb_get_serial_port_data(port);
411 u8 frame_fmt, control;
418 cflag = tty->termios.c_cflag;
420 spin_lock_irqsave(&priv->lock, flags);
421 divisor = priv->pending_setup.divisor;
422 frame_fmt = priv->pending_setup.frame_fmt;
423 control = priv->pending_setup.control;
424 spin_unlock_irqrestore(&priv->lock, flags);
426 frame_fmt &= ~FMT_DATA_BITS_MASK;
427 switch (cflag & CSIZE) {
429 frame_fmt |= FMT_DATA_BITS_5;
432 frame_fmt |= FMT_DATA_BITS_6;
435 frame_fmt |= FMT_DATA_BITS_7;
439 frame_fmt |= FMT_DATA_BITS_8;
443 /* manufacturer claims that this device can work with baud rates
444 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
445 * guarantee that any other baud rate will work (especially
448 br = tty_get_baud_rate(tty);
454 br = min(br, OTI6858_MAX_BAUD_RATE);
456 new_divisor = (96000000 + 8 * br) / (16 * br);
457 real_br = 96000000 / (16 * new_divisor);
458 divisor = cpu_to_le16(new_divisor);
459 tty_encode_baud_rate(tty, real_br, real_br);
462 frame_fmt &= ~FMT_STOP_BITS_MASK;
463 if ((cflag & CSTOPB) != 0)
464 frame_fmt |= FMT_STOP_BITS_2;
466 frame_fmt |= FMT_STOP_BITS_1;
468 frame_fmt &= ~FMT_PARITY_MASK;
469 if ((cflag & PARENB) != 0) {
470 if ((cflag & PARODD) != 0)
471 frame_fmt |= FMT_PARITY_ODD;
473 frame_fmt |= FMT_PARITY_EVEN;
475 frame_fmt |= FMT_PARITY_NONE;
478 control &= ~CONTROL_MASK;
479 if ((cflag & CRTSCTS) != 0)
480 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
482 /* change control lines if we are switching to or from B0 */
484 spin_lock_irqsave(&priv->lock, flags);
485 control = priv->line_control;
486 if ((cflag & CBAUD) == B0)
487 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
489 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
490 if (control != priv->line_control) {
491 control = priv->line_control;
492 spin_unlock_irqrestore(&priv->lock, flags);
493 set_control_lines(serial->dev, control);
495 spin_unlock_irqrestore(&priv->lock, flags);
499 spin_lock_irqsave(&priv->lock, flags);
500 if (divisor != priv->pending_setup.divisor
501 || control != priv->pending_setup.control
502 || frame_fmt != priv->pending_setup.frame_fmt) {
503 priv->pending_setup.divisor = divisor;
504 priv->pending_setup.control = control;
505 priv->pending_setup.frame_fmt = frame_fmt;
507 spin_unlock_irqrestore(&priv->lock, flags);
510 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
512 struct oti6858_private *priv = usb_get_serial_port_data(port);
513 struct ktermios tmp_termios;
514 struct usb_serial *serial = port->serial;
515 struct oti6858_control_pkt *buf;
519 usb_clear_halt(serial->dev, port->write_urb->pipe);
520 usb_clear_halt(serial->dev, port->read_urb->pipe);
522 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
524 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
528 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
529 OTI6858_REQ_T_GET_STATUS,
530 OTI6858_REQ_GET_STATUS,
532 buf, OTI6858_CTRL_PKT_SIZE,
534 if (result != OTI6858_CTRL_PKT_SIZE) {
535 /* assume default (after power-on reset) values */
536 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
537 buf->frame_fmt = 0x03; /* 8N1 */
538 buf->something = 0x43;
539 buf->control = 0x4c; /* DTR, RTS */
540 buf->tx_status = 0x00;
541 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
542 buf->rx_bytes_avail = 0x00;
545 spin_lock_irqsave(&priv->lock, flags);
546 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
547 priv->pending_setup.divisor = buf->divisor;
548 priv->pending_setup.frame_fmt = buf->frame_fmt;
549 priv->pending_setup.control = buf->control;
550 spin_unlock_irqrestore(&priv->lock, flags);
553 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
554 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
556 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
564 oti6858_set_termios(tty, port, &tmp_termios);
565 port->port.drain_delay = 256; /* FIXME: check the FIFO length */
569 static void oti6858_close(struct usb_serial_port *port)
571 struct oti6858_private *priv = usb_get_serial_port_data(port);
574 spin_lock_irqsave(&port->lock, flags);
575 /* clear out any remaining data in the buffer */
576 kfifo_reset_out(&port->write_fifo);
577 spin_unlock_irqrestore(&port->lock, flags);
579 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
581 /* cancel scheduled setup */
582 cancel_delayed_work_sync(&priv->delayed_setup_work);
583 cancel_delayed_work_sync(&priv->delayed_write_work);
585 /* shutdown our urbs */
586 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
587 usb_kill_urb(port->write_urb);
588 usb_kill_urb(port->read_urb);
589 usb_kill_urb(port->interrupt_in_urb);
592 static int oti6858_tiocmset(struct tty_struct *tty,
593 unsigned int set, unsigned int clear)
595 struct usb_serial_port *port = tty->driver_data;
596 struct oti6858_private *priv = usb_get_serial_port_data(port);
600 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
601 __func__, set, clear);
603 /* FIXME: check if this is correct (active high/low) */
604 spin_lock_irqsave(&priv->lock, flags);
605 control = priv->pending_setup.control;
606 if ((set & TIOCM_RTS) != 0)
607 control |= CONTROL_RTS_HIGH;
608 if ((set & TIOCM_DTR) != 0)
609 control |= CONTROL_DTR_HIGH;
610 if ((clear & TIOCM_RTS) != 0)
611 control &= ~CONTROL_RTS_HIGH;
612 if ((clear & TIOCM_DTR) != 0)
613 control &= ~CONTROL_DTR_HIGH;
615 if (control != priv->pending_setup.control)
616 priv->pending_setup.control = control;
618 spin_unlock_irqrestore(&priv->lock, flags);
622 static int oti6858_tiocmget(struct tty_struct *tty)
624 struct usb_serial_port *port = tty->driver_data;
625 struct oti6858_private *priv = usb_get_serial_port_data(port);
630 spin_lock_irqsave(&priv->lock, flags);
631 pin_state = priv->status.pin_state & PIN_MASK;
632 spin_unlock_irqrestore(&priv->lock, flags);
634 /* FIXME: check if this is correct (active high/low) */
635 if ((pin_state & PIN_RTS) != 0)
637 if ((pin_state & PIN_CTS) != 0)
639 if ((pin_state & PIN_DSR) != 0)
641 if ((pin_state & PIN_DTR) != 0)
643 if ((pin_state & PIN_RI) != 0)
645 if ((pin_state & PIN_DCD) != 0)
648 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
653 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
655 struct oti6858_private *priv = usb_get_serial_port_data(port);
657 unsigned int prev, status;
658 unsigned int changed;
660 spin_lock_irqsave(&priv->lock, flags);
661 prev = priv->status.pin_state;
662 spin_unlock_irqrestore(&priv->lock, flags);
665 wait_event_interruptible(port->delta_msr_wait,
666 port->serial->disconnected ||
667 priv->status.pin_state != prev);
668 if (signal_pending(current))
671 if (port->serial->disconnected)
674 spin_lock_irqsave(&priv->lock, flags);
675 status = priv->status.pin_state & PIN_MASK;
676 spin_unlock_irqrestore(&priv->lock, flags);
678 changed = prev ^ status;
679 /* FIXME: check if this is correct (active high/low) */
680 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) ||
681 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) ||
682 ((arg & TIOCM_CD) && (changed & PIN_DCD)) ||
683 ((arg & TIOCM_CTS) && (changed & PIN_CTS)))
692 static int oti6858_ioctl(struct tty_struct *tty,
693 unsigned int cmd, unsigned long arg)
695 struct usb_serial_port *port = tty->driver_data;
697 dev_dbg(&port->dev, "%s(cmd = 0x%04x, arg = 0x%08lx)\n", __func__, cmd, arg);
701 dev_dbg(&port->dev, "%s(): TIOCMIWAIT\n", __func__);
702 return wait_modem_info(port, arg);
704 dev_dbg(&port->dev, "%s(): 0x%04x not supported\n", __func__, cmd);
710 static void oti6858_read_int_callback(struct urb *urb)
712 struct usb_serial_port *port = urb->context;
713 struct oti6858_private *priv = usb_get_serial_port_data(port);
714 int transient = 0, can_recv = 0, resubmit = 1;
715 int status = urb->status;
724 /* this urb is terminated, clean up */
725 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
729 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
734 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
735 struct oti6858_control_pkt *xs = urb->transfer_buffer;
738 spin_lock_irqsave(&priv->lock, flags);
740 if (!priv->transient) {
741 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
742 if (xs->rx_bytes_avail == 0) {
744 priv->setup_done = 0;
746 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
747 schedule_delayed_work(&priv->delayed_setup_work, 0);
751 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
753 } else if (!priv->setup_done) {
755 } else if (--priv->transient == 0) {
756 if (xs->rx_bytes_avail == 0) {
758 priv->setup_done = 0;
760 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
761 schedule_delayed_work(&priv->delayed_setup_work, 0);
766 if (!priv->transient) {
767 if (xs->pin_state != priv->status.pin_state)
768 wake_up_interruptible(&port->delta_msr_wait);
769 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
772 if (!priv->transient && xs->rx_bytes_avail != 0) {
773 can_recv = xs->rx_bytes_avail;
774 priv->flags.read_urb_in_use = 1;
777 transient = priv->transient;
778 spin_unlock_irqrestore(&priv->lock, flags);
784 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
786 priv->flags.read_urb_in_use = 0;
787 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
788 " error %d\n", __func__, result);
792 } else if (!transient) {
796 spin_lock_irqsave(&port->lock, flags);
797 count = kfifo_len(&port->write_fifo);
798 spin_unlock_irqrestore(&port->lock, flags);
800 spin_lock_irqsave(&priv->lock, flags);
801 if (priv->flags.write_urb_in_use == 0 && count != 0) {
802 schedule_delayed_work(&priv->delayed_write_work, 0);
805 spin_unlock_irqrestore(&priv->lock, flags);
811 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */
812 result = usb_submit_urb(urb, GFP_ATOMIC);
814 dev_err(&urb->dev->dev,
815 "%s(): usb_submit_urb() failed with"
816 " error %d\n", __func__, result);
821 static void oti6858_read_bulk_callback(struct urb *urb)
823 struct usb_serial_port *port = urb->context;
824 struct oti6858_private *priv = usb_get_serial_port_data(port);
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 if (urb->actual_length > 0) {
840 tty_insert_flip_string(&port->port, data, urb->actual_length);
841 tty_flip_buffer_push(&port->port);
844 /* schedule the interrupt urb */
845 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
846 if (result != 0 && result != -EPERM) {
847 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
848 " error %d\n", __func__, result);
852 static void oti6858_write_bulk_callback(struct urb *urb)
854 struct usb_serial_port *port = urb->context;
855 struct oti6858_private *priv = usb_get_serial_port_data(port);
856 int status = urb->status;
866 /* this urb is terminated, clean up */
867 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
868 priv->flags.write_urb_in_use = 0;
871 /* error in the urb, so we have to resubmit it */
872 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
873 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
875 port->write_urb->transfer_buffer_length = 1;
876 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
878 dev_err_console(port, "%s(): usb_submit_urb() failed,"
879 " error %d\n", __func__, result);
885 priv->flags.write_urb_in_use = 0;
887 /* schedule the interrupt urb if we are still open */
888 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
889 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
891 dev_err(&port->dev, "%s(): failed submitting int urb,"
892 " error %d\n", __func__, result);
896 module_usb_serial_driver(serial_drivers, id_table);
898 MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
899 MODULE_AUTHOR(OTI6858_AUTHOR);
900 MODULE_LICENSE("GPL");