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linux/drivers/usb/serial/ir-usb.c

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/*
* USB IR Dongle driver
*
* Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2002 Gary Brubaker (xavyer@ix.netcom.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This driver allows a USB IrDA device to be used as a "dumb" serial device.
* This can be useful if you do not have access to a full IrDA stack on the
* other side of the connection. If you do have an IrDA stack on both devices,
* please use the usb-irda driver, as it contains the proper error checking and
* other goodness of a full IrDA stack.
*
* Portions of this driver were taken from drivers/net/irda/irda-usb.c, which
* was written by Roman Weissgaerber <weissg@vienna.at>, Dag Brattli
* <dag@brattli.net>, and Jean Tourrilhes <jt@hpl.hp.com>
*
* See Documentation/usb/usb-serial.txt for more information on using this driver
*
* 2002_Mar_07 greg kh
* moved some needed structures and #define values from the
* net/irda/irda-usb.h file into our file, as we don't want to depend on
* that codebase compiling correctly :)
*
* 2002_Jan_14 gb
* Added module parameter to force specific number of XBOFs.
* Added ir_xbof_change().
* Reorganized read_bulk_callback error handling.
* Switched from FILL_BULK_URB() to usb_fill_bulk_urb().
*
* 2001_Nov_08 greg kh
* Changed the irda_usb_find_class_desc() function based on comments and
* code from Martin Diehl.
*
* 2001_Nov_01 greg kh
* Added support for more IrDA USB devices.
* Added support for zero packet. Added buffer override paramater, so
* users can transfer larger packets at once if they wish. Both patches
* came from Dag Brattli <dag@obexcode.com>.
*
* 2001_Oct_07 greg kh
* initial version released.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
/*
* Version Information
*/
#define DRIVER_VERSION "v0.4"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
#define DRIVER_DESC "USB IR Dongle driver"
/* USB IrDA class spec information */
#define USB_CLASS_IRDA 0x02
#define USB_DT_IRDA 0x21
#define IU_REQ_GET_CLASS_DESC 0x06
#define SPEED_2400 0x01
#define SPEED_9600 0x02
#define SPEED_19200 0x03
#define SPEED_38400 0x04
#define SPEED_57600 0x05
#define SPEED_115200 0x06
#define SPEED_576000 0x07
#define SPEED_1152000 0x08
#define SPEED_4000000 0x09
struct irda_class_desc {
u8 bLength;
u8 bDescriptorType;
u16 bcdSpecRevision;
u8 bmDataSize;
u8 bmWindowSize;
u8 bmMinTurnaroundTime;
u16 wBaudRate;
u8 bmAdditionalBOFs;
u8 bIrdaRateSniff;
u8 bMaxUnicastList;
} __attribute__ ((packed));
static int debug;
/* if overridden by the user, then use their value for the size of the read and
* write urbs */
static int buffer_size;
/* if overridden by the user, then use the specified number of XBOFs */
static int xbof = -1;
static int ir_startup (struct usb_serial *serial);
static int ir_open (struct usb_serial_port *port, struct file *filep);
static void ir_close (struct usb_serial_port *port, struct file *filep);
static int ir_write (struct usb_serial_port *port, const unsigned char *buf, int count);
static void ir_write_bulk_callback (struct urb *urb);
static void ir_read_bulk_callback (struct urb *urb);
static void ir_set_termios (struct usb_serial_port *port, struct ktermios *old_termios);
static u8 ir_baud = 0;
static u8 ir_xbof = 0;
static u8 ir_add_bof = 0;
static struct usb_device_id id_table [] = {
{ USB_DEVICE(0x050f, 0x0180) }, /* KC Technology, KC-180 */
{ USB_DEVICE(0x08e9, 0x0100) }, /* XTNDAccess */
{ USB_DEVICE(0x09c4, 0x0011) }, /* ACTiSys ACT-IR2000U */
{ USB_INTERFACE_INFO (USB_CLASS_APP_SPEC, USB_CLASS_IRDA, 0) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, id_table);
static struct usb_driver ir_driver = {
.name = "ir-usb",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
.no_dynamic_id = 1,
};
static struct usb_serial_driver ir_device = {
.driver = {
.owner = THIS_MODULE,
.name = "ir-usb",
},
.description = "IR Dongle",
.id_table = id_table,
.num_interrupt_in = 1,
.num_bulk_in = 1,
.num_bulk_out = 1,
.num_ports = 1,
.set_termios = ir_set_termios,
.attach = ir_startup,
.open = ir_open,
.close = ir_close,
.write = ir_write,
.write_bulk_callback = ir_write_bulk_callback,
.read_bulk_callback = ir_read_bulk_callback,
};
static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc)
{
dbg("bLength=%x", desc->bLength);
dbg("bDescriptorType=%x", desc->bDescriptorType);
dbg("bcdSpecRevision=%x", desc->bcdSpecRevision);
dbg("bmDataSize=%x", desc->bmDataSize);
dbg("bmWindowSize=%x", desc->bmWindowSize);
dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime);
dbg("wBaudRate=%x", desc->wBaudRate);
dbg("bmAdditionalBOFs=%x", desc->bmAdditionalBOFs);
dbg("bIrdaRateSniff=%x", desc->bIrdaRateSniff);
dbg("bMaxUnicastList=%x", desc->bMaxUnicastList);
}
/*------------------------------------------------------------------*/
/*
* Function irda_usb_find_class_desc(dev, ifnum)
*
* Returns instance of IrDA class descriptor, or NULL if not found
*
* The class descriptor is some extra info that IrDA USB devices will
* offer to us, describing their IrDA characteristics. We will use that in
* irda_usb_init_qos()
*
* Based on the same function in drivers/net/irda/irda-usb.c
*/
static struct irda_class_desc *irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum)
{
struct irda_class_desc *desc;
int ret;
desc = kzalloc(sizeof (struct irda_class_desc), GFP_KERNEL);
if (desc == NULL)
return NULL;
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0),
IU_REQ_GET_CLASS_DESC,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0, ifnum, desc, sizeof(*desc), 1000);
dbg("%s - ret=%d", __FUNCTION__, ret);
if (ret < sizeof(*desc)) {
dbg("%s - class descriptor read %s (%d)",
__FUNCTION__,
(ret<0) ? "failed" : "too short",
ret);
goto error;
}
if (desc->bDescriptorType != USB_DT_IRDA) {
dbg("%s - bad class descriptor type", __FUNCTION__);
goto error;
}
irda_usb_dump_class_desc(desc);
return desc;
error:
kfree(desc);
return NULL;
}
static u8 ir_xbof_change(u8 xbof)
{
u8 result;
/* reference irda-usb.c */
switch(xbof) {
case 48: result = 0x10; break;
case 28:
case 24: result = 0x20; break;
default:
case 12: result = 0x30; break;
case 5:
case 6: result = 0x40; break;
case 3: result = 0x50; break;
case 2: result = 0x60; break;
case 1: result = 0x70; break;
case 0: result = 0x80; break;
}
return(result);
}
static int ir_startup (struct usb_serial *serial)
{
struct irda_class_desc *irda_desc;
irda_desc = irda_usb_find_class_desc (serial->dev, 0);
if (irda_desc == NULL) {
dev_err (&serial->dev->dev, "IRDA class descriptor not found, device not bound\n");
return -ENODEV;
}
dbg ("%s - Baud rates supported:%s%s%s%s%s%s%s%s%s",
__FUNCTION__,
(irda_desc->wBaudRate & 0x0001) ? " 2400" : "",
(irda_desc->wBaudRate & 0x0002) ? " 9600" : "",
(irda_desc->wBaudRate & 0x0004) ? " 19200" : "",
(irda_desc->wBaudRate & 0x0008) ? " 38400" : "",
(irda_desc->wBaudRate & 0x0010) ? " 57600" : "",
(irda_desc->wBaudRate & 0x0020) ? " 115200" : "",
(irda_desc->wBaudRate & 0x0040) ? " 576000" : "",
(irda_desc->wBaudRate & 0x0080) ? " 1152000" : "",
(irda_desc->wBaudRate & 0x0100) ? " 4000000" : "");
switch( irda_desc->bmAdditionalBOFs ) {
case 0x01: ir_add_bof = 48; break;
case 0x02: ir_add_bof = 24; break;
case 0x04: ir_add_bof = 12; break;
case 0x08: ir_add_bof = 6; break;
case 0x10: ir_add_bof = 3; break;
case 0x20: ir_add_bof = 2; break;
case 0x40: ir_add_bof = 1; break;
case 0x80: ir_add_bof = 0; break;
default:;
}
kfree (irda_desc);
return 0;
}
static int ir_open (struct usb_serial_port *port, struct file *filp)
{
char *buffer;
int result = 0;
dbg("%s - port %d", __FUNCTION__, port->number);
if (buffer_size) {
/* override the default buffer sizes */
buffer = kmalloc (buffer_size, GFP_KERNEL);
if (!buffer) {
dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
return -ENOMEM;
}
kfree (port->read_urb->transfer_buffer);
port->read_urb->transfer_buffer = buffer;
port->read_urb->transfer_buffer_length = buffer_size;
buffer = kmalloc (buffer_size, GFP_KERNEL);
if (!buffer) {
dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
return -ENOMEM;
}
kfree (port->write_urb->transfer_buffer);
port->write_urb->transfer_buffer = buffer;
port->write_urb->transfer_buffer_length = buffer_size;
port->bulk_out_size = buffer_size;
}
/* Start reading from the device */
usb_fill_bulk_urb (
port->read_urb,
port->serial->dev,
usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
port->read_urb->transfer_buffer,
port->read_urb->transfer_buffer_length,
ir_read_bulk_callback,
port);
result = usb_submit_urb(port->read_urb, GFP_KERNEL);
if (result)
dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
return result;
}
static void ir_close (struct usb_serial_port *port, struct file * filp)
{
dbg("%s - port %d", __FUNCTION__, port->number);
/* shutdown our bulk read */
usb_kill_urb(port->read_urb);
}
static int ir_write (struct usb_serial_port *port, const unsigned char *buf, int count)
{
unsigned char *transfer_buffer;
int result;
int transfer_size;
dbg("%s - port = %d, count = %d", __FUNCTION__, port->number, count);
if (!port->tty) {
dev_err (&port->dev, "%s - no tty???\n", __FUNCTION__);
return 0;
}
if (count == 0)
return 0;
spin_lock_bh(&port->lock);
if (port->write_urb_busy) {
spin_unlock_bh(&port->lock);
dbg("%s - already writing", __FUNCTION__);
return 0;
}
port->write_urb_busy = 1;
spin_unlock_bh(&port->lock);
transfer_buffer = port->write_urb->transfer_buffer;
transfer_size = min(count, port->bulk_out_size - 1);
/*
* The first byte of the packet we send to the device contains an
* inband header which indicates an additional number of BOFs and
* a baud rate change.
*
* See section 5.4.2.2 of the USB IrDA spec.
*/
*transfer_buffer = ir_xbof | ir_baud;
++transfer_buffer;
memcpy (transfer_buffer, buf, transfer_size);
usb_fill_bulk_urb (
port->write_urb,
port->serial->dev,
usb_sndbulkpipe(port->serial->dev,
port->bulk_out_endpointAddress),
port->write_urb->transfer_buffer,
transfer_size + 1,
ir_write_bulk_callback,
port);
port->write_urb->transfer_flags = URB_ZERO_PACKET;
result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
if (result) {
port->write_urb_busy = 0;
dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
} else
result = transfer_size;
return result;
}
static void ir_write_bulk_callback (struct urb *urb)
{
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
dbg("%s - port %d", __FUNCTION__, port->number);
port->write_urb_busy = 0;
if (urb->status) {
dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
return;
}
usb_serial_debug_data (
debug,
&port->dev,
__FUNCTION__,
urb->actual_length,
urb->transfer_buffer);
usb_serial_port_softint(port);
}
static void ir_read_bulk_callback (struct urb *urb)
{
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
int result;
dbg("%s - port %d", __FUNCTION__, port->number);
if (!port->open_count) {
dbg("%s - port closed.", __FUNCTION__);
return;
}
switch (urb->status) {
case 0: /* Successful */
/*
* The first byte of the packet we get from the device
* contains a busy indicator and baud rate change.
* See section 5.4.1.2 of the USB IrDA spec.
*/
if ((*data & 0x0f) > 0)
ir_baud = *data & 0x0f;
usb_serial_debug_data (
debug,
&port->dev,
__FUNCTION__,
urb->actual_length,
data);
/*
* Bypass flip-buffers, and feed the ldisc directly
* due to our potentially large buffer size. Since we
* used to set low_latency, this is exactly what the
* tty layer did anyway :)
*/
tty = port->tty;
/*
* FIXME: must not do this in IRQ context
*/
tty->ldisc.receive_buf(
tty,
data+1,
NULL,
urb->actual_length-1);
/*
* No break here.
* We want to resubmit the urb so we can read
* again.
*/
case -EPROTO: /* taking inspiration from pl2303.c */
/* Continue trying to always read */
usb_fill_bulk_urb (
port->read_urb,
port->serial->dev,
usb_rcvbulkpipe(port->serial->dev,
port->bulk_in_endpointAddress),
port->read_urb->transfer_buffer,
port->read_urb->transfer_buffer_length,
ir_read_bulk_callback,
port);
result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
if (result)
dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
__FUNCTION__, result);
break ;
default:
dbg("%s - nonzero read bulk status received: %d",
__FUNCTION__,
urb->status);
break ;
}
return;
}
static void ir_set_termios (struct usb_serial_port *port, struct ktermios *old_termios)
{
unsigned char *transfer_buffer;
unsigned int cflag;
int result;
dbg("%s - port %d", __FUNCTION__, port->number);
if ((!port->tty) || (!port->tty->termios)) {
dbg("%s - no tty structures", __FUNCTION__);
return;
}
cflag = port->tty->termios->c_cflag;
/* check that they really want us to change something */
if (old_termios) {
if ((cflag == old_termios->c_cflag) &&
(RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
dbg("%s - nothing to change...", __FUNCTION__);
return;
}
}
/* All we can change is the baud rate */
if (cflag & CBAUD) {
dbg ("%s - asking for baud %d",
__FUNCTION__,
tty_get_baud_rate(port->tty));
/*
* FIXME, we should compare the baud request against the
* capability stated in the IR header that we got in the
* startup function.
*/
switch (cflag & CBAUD) {
case B2400: ir_baud = SPEED_2400; break;
default:
case B9600: ir_baud = SPEED_9600; break;
case B19200: ir_baud = SPEED_19200; break;
case B38400: ir_baud = SPEED_38400; break;
case B57600: ir_baud = SPEED_57600; break;
case B115200: ir_baud = SPEED_115200; break;
case B576000: ir_baud = SPEED_576000; break;
case B1152000: ir_baud = SPEED_1152000; break;
#ifdef B4000000
case B4000000: ir_baud = SPEED_4000000; break;
#endif
}
if (xbof == -1) {
ir_xbof = ir_xbof_change(ir_add_bof);
} else {
ir_xbof = ir_xbof_change(xbof) ;
}
/* Notify the tty driver that the termios have changed. */
port->tty->ldisc.set_termios(port->tty, NULL);
/* FIXME need to check to see if our write urb is busy right
* now, or use a urb pool.
*
* send the baud change out on an "empty" data packet
*/
transfer_buffer = port->write_urb->transfer_buffer;
*transfer_buffer = ir_xbof | ir_baud;
usb_fill_bulk_urb (
port->write_urb,
port->serial->dev,
usb_sndbulkpipe(port->serial->dev,
port->bulk_out_endpointAddress),
port->write_urb->transfer_buffer,
1,
ir_write_bulk_callback,
port);
port->write_urb->transfer_flags = URB_ZERO_PACKET;
result = usb_submit_urb (port->write_urb, GFP_KERNEL);
if (result)
dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
}
return;
}
static int __init ir_init (void)
{
int retval;
retval = usb_serial_register(&ir_device);
if (retval)
goto failed_usb_serial_register;
retval = usb_register(&ir_driver);
if (retval)
goto failed_usb_register;
info(DRIVER_DESC " " DRIVER_VERSION);
return 0;
failed_usb_register:
usb_serial_deregister(&ir_device);
failed_usb_serial_register:
return retval;
}
static void __exit ir_exit (void)
{
usb_deregister (&ir_driver);
usb_serial_deregister (&ir_device);
}
module_init(ir_init);
module_exit(ir_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
module_param(xbof, int, 0);
MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
module_param(buffer_size, int, 0);
MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");
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