489 lines
12 KiB
C
489 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* USB IR Dongle driver
|
|
*
|
|
* Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
|
|
* Copyright (C) 2002 Gary Brubaker (xavyer@ix.netcom.com)
|
|
* Copyright (C) 2010 Johan Hovold (jhovold@gmail.com)
|
|
*
|
|
* 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.rst for more information on using this
|
|
* driver
|
|
*/
|
|
|
|
#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 <linux/uaccess.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/serial.h>
|
|
#include <linux/usb/irda.h>
|
|
|
|
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Johan Hovold <jhovold@gmail.com>"
|
|
#define DRIVER_DESC "USB IR Dongle driver"
|
|
|
|
/* 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_write(struct tty_struct *tty, struct usb_serial_port *port,
|
|
const unsigned char *buf, int count);
|
|
static unsigned int ir_write_room(struct tty_struct *tty);
|
|
static void ir_write_bulk_callback(struct urb *urb);
|
|
static void ir_process_read_urb(struct urb *urb);
|
|
static void ir_set_termios(struct tty_struct *tty,
|
|
struct usb_serial_port *port,
|
|
const struct ktermios *old_termios);
|
|
|
|
/* Not that this lot means you can only have one per system */
|
|
static u8 ir_baud;
|
|
static u8 ir_xbof;
|
|
static u8 ir_add_bof;
|
|
|
|
static const struct usb_device_id ir_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_SUBCLASS_IRDA, 0) },
|
|
{ } /* Terminating entry */
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(usb, ir_id_table);
|
|
|
|
static struct usb_serial_driver ir_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ir-usb",
|
|
},
|
|
.description = "IR Dongle",
|
|
.id_table = ir_id_table,
|
|
.num_ports = 1,
|
|
.num_bulk_in = 1,
|
|
.num_bulk_out = 1,
|
|
.set_termios = ir_set_termios,
|
|
.attach = ir_startup,
|
|
.write = ir_write,
|
|
.write_room = ir_write_room,
|
|
.write_bulk_callback = ir_write_bulk_callback,
|
|
.process_read_urb = ir_process_read_urb,
|
|
};
|
|
|
|
static struct usb_serial_driver * const serial_drivers[] = {
|
|
&ir_device, NULL
|
|
};
|
|
|
|
static inline void irda_usb_dump_class_desc(struct usb_serial *serial,
|
|
struct usb_irda_cs_descriptor *desc)
|
|
{
|
|
struct device *dev = &serial->dev->dev;
|
|
|
|
dev_dbg(dev, "bLength=%x\n", desc->bLength);
|
|
dev_dbg(dev, "bDescriptorType=%x\n", desc->bDescriptorType);
|
|
dev_dbg(dev, "bcdSpecRevision=%x\n", __le16_to_cpu(desc->bcdSpecRevision));
|
|
dev_dbg(dev, "bmDataSize=%x\n", desc->bmDataSize);
|
|
dev_dbg(dev, "bmWindowSize=%x\n", desc->bmWindowSize);
|
|
dev_dbg(dev, "bmMinTurnaroundTime=%d\n", desc->bmMinTurnaroundTime);
|
|
dev_dbg(dev, "wBaudRate=%x\n", __le16_to_cpu(desc->wBaudRate));
|
|
dev_dbg(dev, "bmAdditionalBOFs=%x\n", desc->bmAdditionalBOFs);
|
|
dev_dbg(dev, "bIrdaRateSniff=%x\n", desc->bIrdaRateSniff);
|
|
dev_dbg(dev, "bMaxUnicastList=%x\n", 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 usb_irda_cs_descriptor *
|
|
irda_usb_find_class_desc(struct usb_serial *serial, unsigned int ifnum)
|
|
{
|
|
struct usb_device *dev = serial->dev;
|
|
struct usb_irda_cs_descriptor *desc;
|
|
int ret;
|
|
|
|
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
|
|
if (!desc)
|
|
return NULL;
|
|
|
|
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
|
|
USB_REQ_CS_IRDA_GET_CLASS_DESC,
|
|
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
|
|
0, ifnum, desc, sizeof(*desc), 1000);
|
|
|
|
dev_dbg(&serial->dev->dev, "%s - ret=%d\n", __func__, ret);
|
|
if (ret < (int)sizeof(*desc)) {
|
|
dev_dbg(&serial->dev->dev,
|
|
"%s - class descriptor read %s (%d)\n", __func__,
|
|
(ret < 0) ? "failed" : "too short", ret);
|
|
goto error;
|
|
}
|
|
if (desc->bDescriptorType != USB_DT_CS_IRDA) {
|
|
dev_dbg(&serial->dev->dev, "%s - bad class descriptor type\n",
|
|
__func__);
|
|
goto error;
|
|
}
|
|
|
|
irda_usb_dump_class_desc(serial, 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 usb_irda_cs_descriptor *irda_desc;
|
|
int rates;
|
|
|
|
irda_desc = irda_usb_find_class_desc(serial, 0);
|
|
if (!irda_desc) {
|
|
dev_err(&serial->dev->dev,
|
|
"IRDA class descriptor not found, device not bound\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
rates = le16_to_cpu(irda_desc->wBaudRate);
|
|
|
|
dev_dbg(&serial->dev->dev,
|
|
"%s - Baud rates supported:%s%s%s%s%s%s%s%s%s\n",
|
|
__func__,
|
|
(rates & USB_IRDA_BR_2400) ? " 2400" : "",
|
|
(rates & USB_IRDA_BR_9600) ? " 9600" : "",
|
|
(rates & USB_IRDA_BR_19200) ? " 19200" : "",
|
|
(rates & USB_IRDA_BR_38400) ? " 38400" : "",
|
|
(rates & USB_IRDA_BR_57600) ? " 57600" : "",
|
|
(rates & USB_IRDA_BR_115200) ? " 115200" : "",
|
|
(rates & USB_IRDA_BR_576000) ? " 576000" : "",
|
|
(rates & USB_IRDA_BR_1152000) ? " 1152000" : "",
|
|
(rates & USB_IRDA_BR_4000000) ? " 4000000" : "");
|
|
|
|
switch (irda_desc->bmAdditionalBOFs) {
|
|
case USB_IRDA_AB_48:
|
|
ir_add_bof = 48;
|
|
break;
|
|
case USB_IRDA_AB_24:
|
|
ir_add_bof = 24;
|
|
break;
|
|
case USB_IRDA_AB_12:
|
|
ir_add_bof = 12;
|
|
break;
|
|
case USB_IRDA_AB_6:
|
|
ir_add_bof = 6;
|
|
break;
|
|
case USB_IRDA_AB_3:
|
|
ir_add_bof = 3;
|
|
break;
|
|
case USB_IRDA_AB_2:
|
|
ir_add_bof = 2;
|
|
break;
|
|
case USB_IRDA_AB_1:
|
|
ir_add_bof = 1;
|
|
break;
|
|
case USB_IRDA_AB_0:
|
|
ir_add_bof = 0;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
kfree(irda_desc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ir_write(struct tty_struct *tty, struct usb_serial_port *port,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
struct urb *urb = NULL;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
if (port->bulk_out_size == 0)
|
|
return -EINVAL;
|
|
|
|
if (count == 0)
|
|
return 0;
|
|
|
|
count = min(count, port->bulk_out_size - 1);
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
if (__test_and_clear_bit(0, &port->write_urbs_free)) {
|
|
urb = port->write_urbs[0];
|
|
port->tx_bytes += count;
|
|
}
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
if (!urb)
|
|
return 0;
|
|
|
|
/*
|
|
* The first byte of the packet we send to the device contains an
|
|
* outbound header which indicates an additional number of BOFs and
|
|
* a baud rate change.
|
|
*
|
|
* See section 5.4.2.2 of the USB IrDA spec.
|
|
*/
|
|
*(u8 *)urb->transfer_buffer = ir_xbof | ir_baud;
|
|
|
|
memcpy(urb->transfer_buffer + 1, buf, count);
|
|
|
|
urb->transfer_buffer_length = count + 1;
|
|
urb->transfer_flags = URB_ZERO_PACKET;
|
|
|
|
ret = usb_submit_urb(urb, GFP_ATOMIC);
|
|
if (ret) {
|
|
dev_err(&port->dev, "failed to submit write urb: %d\n", ret);
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
__set_bit(0, &port->write_urbs_free);
|
|
port->tx_bytes -= count;
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static void ir_write_bulk_callback(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
int status = urb->status;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
__set_bit(0, &port->write_urbs_free);
|
|
port->tx_bytes -= urb->transfer_buffer_length - 1;
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
switch (status) {
|
|
case 0:
|
|
break;
|
|
case -ENOENT:
|
|
case -ECONNRESET:
|
|
case -ESHUTDOWN:
|
|
dev_dbg(&port->dev, "write urb stopped: %d\n", status);
|
|
return;
|
|
case -EPIPE:
|
|
dev_err(&port->dev, "write urb stopped: %d\n", status);
|
|
return;
|
|
default:
|
|
dev_err(&port->dev, "nonzero write-urb status: %d\n", status);
|
|
break;
|
|
}
|
|
|
|
usb_serial_port_softint(port);
|
|
}
|
|
|
|
static unsigned int ir_write_room(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
unsigned int count = 0;
|
|
|
|
if (port->bulk_out_size == 0)
|
|
return 0;
|
|
|
|
if (test_bit(0, &port->write_urbs_free))
|
|
count = port->bulk_out_size - 1;
|
|
|
|
return count;
|
|
}
|
|
|
|
static void ir_process_read_urb(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
unsigned char *data = urb->transfer_buffer;
|
|
|
|
if (!urb->actual_length)
|
|
return;
|
|
/*
|
|
* 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)
|
|
ir_baud = *data & 0x0f;
|
|
|
|
if (urb->actual_length == 1)
|
|
return;
|
|
|
|
tty_insert_flip_string(&port->port, data + 1, urb->actual_length - 1);
|
|
tty_flip_buffer_push(&port->port);
|
|
}
|
|
|
|
static void ir_set_termios(struct tty_struct *tty,
|
|
struct usb_serial_port *port,
|
|
const struct ktermios *old_termios)
|
|
{
|
|
struct usb_device *udev = port->serial->dev;
|
|
unsigned char *transfer_buffer;
|
|
int actual_length;
|
|
speed_t baud;
|
|
int ir_baud;
|
|
int ret;
|
|
|
|
baud = tty_get_baud_rate(tty);
|
|
|
|
/*
|
|
* FIXME, we should compare the baud request against the
|
|
* capability stated in the IR header that we got in the
|
|
* startup function.
|
|
*/
|
|
|
|
switch (baud) {
|
|
case 2400:
|
|
ir_baud = USB_IRDA_LS_2400;
|
|
break;
|
|
case 9600:
|
|
ir_baud = USB_IRDA_LS_9600;
|
|
break;
|
|
case 19200:
|
|
ir_baud = USB_IRDA_LS_19200;
|
|
break;
|
|
case 38400:
|
|
ir_baud = USB_IRDA_LS_38400;
|
|
break;
|
|
case 57600:
|
|
ir_baud = USB_IRDA_LS_57600;
|
|
break;
|
|
case 115200:
|
|
ir_baud = USB_IRDA_LS_115200;
|
|
break;
|
|
case 576000:
|
|
ir_baud = USB_IRDA_LS_576000;
|
|
break;
|
|
case 1152000:
|
|
ir_baud = USB_IRDA_LS_1152000;
|
|
break;
|
|
case 4000000:
|
|
ir_baud = USB_IRDA_LS_4000000;
|
|
break;
|
|
default:
|
|
ir_baud = USB_IRDA_LS_9600;
|
|
baud = 9600;
|
|
}
|
|
|
|
if (xbof == -1)
|
|
ir_xbof = ir_xbof_change(ir_add_bof);
|
|
else
|
|
ir_xbof = ir_xbof_change(xbof) ;
|
|
|
|
/* Only speed changes are supported */
|
|
tty_termios_copy_hw(&tty->termios, old_termios);
|
|
tty_encode_baud_rate(tty, baud, baud);
|
|
|
|
/*
|
|
* send the baud change out on an "empty" data packet
|
|
*/
|
|
transfer_buffer = kmalloc(1, GFP_KERNEL);
|
|
if (!transfer_buffer)
|
|
return;
|
|
|
|
*transfer_buffer = ir_xbof | ir_baud;
|
|
|
|
ret = usb_bulk_msg(udev,
|
|
usb_sndbulkpipe(udev, port->bulk_out_endpointAddress),
|
|
transfer_buffer, 1, &actual_length, 5000);
|
|
if (ret || actual_length != 1) {
|
|
if (!ret)
|
|
ret = -EIO;
|
|
dev_err(&port->dev, "failed to change line speed: %d\n", ret);
|
|
}
|
|
|
|
kfree(transfer_buffer);
|
|
}
|
|
|
|
static int __init ir_init(void)
|
|
{
|
|
if (buffer_size) {
|
|
ir_device.bulk_in_size = buffer_size;
|
|
ir_device.bulk_out_size = buffer_size;
|
|
}
|
|
|
|
return usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME, ir_id_table);
|
|
}
|
|
|
|
static void __exit ir_exit(void)
|
|
{
|
|
usb_serial_deregister_drivers(serial_drivers);
|
|
}
|
|
|
|
|
|
module_init(ir_init);
|
|
module_exit(ir_exit);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
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");
|
|
|