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linux/drivers/usb/serial/ir-usb.c
Greg Kroah-Hartman 6ca98bc284 USB: serial: Remove redundant license text 
Now that the SPDX tag is in all USB files, that identifies the license
in a specific and legally-defined manner.  So the extra GPL text wording
can be removed as it is no longer needed at all.

This is done on a quest to remove the 700+ different ways that files in
the kernel describe the GPL license text.  And there's unneeded stuff
like the address (sometimes incorrect) for the FSF which is never
needed.

No copyright headers or other non-license-description text was removed.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-04 11:55:38 +01:00

444 lines
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// 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.txt 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_open(struct tty_struct *tty, struct usb_serial_port *port);
static int ir_prepare_write_buffer(struct usb_serial_port *port,
void *dest, size_t size);
static void ir_process_read_urb(struct urb *urb);
static void ir_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, 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,
.set_termios = ir_set_termios,
.attach = ir_startup,
.open = ir_open,
.prepare_write_buffer = ir_prepare_write_buffer,
.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 < 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_open(struct tty_struct *tty, struct usb_serial_port *port)
{
int i;
for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
port->write_urbs[i]->transfer_flags = URB_ZERO_PACKET;
/* Start reading from the device */
return usb_serial_generic_open(tty, port);
}
static int ir_prepare_write_buffer(struct usb_serial_port *port,
void *dest, size_t size)
{
unsigned char *buf = dest;
int count;
/*
* The first byte of the packet we send to the device contains an
* inbound header which indicates an additional number of BOFs and
* a baud rate change.
*
* See section 5.4.2.2 of the USB IrDA spec.
*/
*buf = ir_xbof | ir_baud;
count = kfifo_out_locked(&port->write_fifo, buf + 1, size - 1,
&port->lock);
return count + 1;
}
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_callback(struct urb *urb)
{
kfree(urb->transfer_buffer);
if (urb->status)
dev_dbg(&urb->dev->dev, "%s - non-zero urb status: %d\n",
__func__, urb->status);
}
static void ir_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
struct urb *urb;
unsigned char *transfer_buffer;
int result;
speed_t baud;
int ir_baud;
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_BR_2400;
break;
case 9600:
ir_baud = USB_IRDA_BR_9600;
break;
case 19200:
ir_baud = USB_IRDA_BR_19200;
break;
case 38400:
ir_baud = USB_IRDA_BR_38400;
break;
case 57600:
ir_baud = USB_IRDA_BR_57600;
break;
case 115200:
ir_baud = USB_IRDA_BR_115200;
break;
case 576000:
ir_baud = USB_IRDA_BR_576000;
break;
case 1152000:
ir_baud = USB_IRDA_BR_1152000;
break;
case 4000000:
ir_baud = USB_IRDA_BR_4000000;
break;
default:
ir_baud = USB_IRDA_BR_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
*/
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb)
return;
transfer_buffer = kmalloc(1, GFP_KERNEL);
if (!transfer_buffer)
goto err_buf;
*transfer_buffer = ir_xbof | ir_baud;
usb_fill_bulk_urb(
urb,
port->serial->dev,
usb_sndbulkpipe(port->serial->dev,
port->bulk_out_endpointAddress),
transfer_buffer,
1,
ir_set_termios_callback,
port);
urb->transfer_flags = URB_ZERO_PACKET;
result = usb_submit_urb(urb, GFP_KERNEL);
if (result) {
dev_err(&port->dev, "%s - failed to submit urb: %d\n",
__func__, result);
goto err_subm;
}
usb_free_urb(urb);
return;
err_subm:
kfree(transfer_buffer);
err_buf:
usb_free_urb(urb);
}
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");
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