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V4L/DVB: staging/lirc: add lirc_ttusbir driver
Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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/* | ||
* lirc_ttusbir.c | ||
* | ||
* lirc_ttusbir - LIRC device driver for the TechnoTrend USB IR Receiver | ||
* | ||
* Copyright (C) 2007 Stefan Macher <st_maker-lirc@yahoo.de> | ||
* | ||
* This LIRC driver provides access to the TechnoTrend USB IR Receiver. | ||
* The receiver delivers the IR signal as raw sampled true/false data in | ||
* isochronous USB packets each of size 128 byte. | ||
* Currently the driver reduces the sampling rate by factor of 8 as this | ||
* is still more than enough to decode RC-5 - others should be analyzed. | ||
* But the driver does not rely on RC-5 it should be able to decode every | ||
* IR signal that is not too fast. | ||
*/ | ||
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/* | ||
* 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 program is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* along with this program; if not, write to the Free Software | ||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
*/ | ||
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#include <linux/version.h> | ||
#include <linux/kernel.h> | ||
#include <linux/init.h> | ||
#include <linux/module.h> | ||
#include <linux/errno.h> | ||
#include <linux/slab.h> | ||
#include <linux/usb.h> | ||
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#include <media/lirc.h> | ||
#include <media/lirc_dev.h> | ||
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MODULE_DESCRIPTION("TechnoTrend USB IR device driver for LIRC"); | ||
MODULE_AUTHOR("Stefan Macher (st_maker-lirc@yahoo.de)"); | ||
MODULE_LICENSE("GPL"); | ||
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/* #define DEBUG */ | ||
#ifdef DEBUG | ||
#define DPRINTK printk | ||
#else | ||
#define DPRINTK(_x_, a...) | ||
#endif | ||
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/* function declarations */ | ||
static int probe(struct usb_interface *intf, const struct usb_device_id *id); | ||
static void disconnect(struct usb_interface *intf); | ||
static void urb_complete(struct urb *urb); | ||
static int set_use_inc(void *data); | ||
static void set_use_dec(void *data); | ||
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static int num_urbs = 2; | ||
module_param(num_urbs, int, S_IRUGO); | ||
MODULE_PARM_DESC(num_urbs, | ||
"Number of URBs in queue. Try to increase to 4 in case " | ||
"of problems (default: 2; minimum: 2)"); | ||
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/* table of devices that work with this driver */ | ||
static struct usb_device_id device_id_table[] = { | ||
/* TechnoTrend USB IR Receiver */ | ||
{ USB_DEVICE(0x0B48, 0x2003) }, | ||
/* Terminating entry */ | ||
{ } | ||
}; | ||
MODULE_DEVICE_TABLE(usb, device_id_table); | ||
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/* USB driver definition */ | ||
static struct usb_driver usb_driver = { | ||
.name = "TTUSBIR", | ||
.id_table = &(device_id_table[0]), | ||
.probe = probe, | ||
.disconnect = disconnect, | ||
}; | ||
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/* USB device definition */ | ||
struct ttusbir_device { | ||
struct usb_driver *usb_driver; | ||
struct usb_device *udev; | ||
struct usb_interface *interf; | ||
struct usb_class_driver class_driver; | ||
unsigned int ifnum; /* Interface number to use */ | ||
unsigned int alt_setting; /* alternate setting to use */ | ||
unsigned int endpoint; /* Endpoint to use */ | ||
struct urb **urb; /* num_urb URB pointers*/ | ||
char **buffer; /* 128 byte buffer for each URB */ | ||
struct lirc_buffer rbuf; /* Buffer towards LIRC */ | ||
struct lirc_driver driver; | ||
int minor; | ||
int last_pulse; /* remembers if last received byte was pulse or space */ | ||
int last_num; /* remembers how many last bytes appeared */ | ||
int opened; | ||
}; | ||
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/*** LIRC specific functions ***/ | ||
static int set_use_inc(void *data) | ||
{ | ||
int i, retval; | ||
struct ttusbir_device *ttusbir = data; | ||
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DPRINTK("Sending first URBs\n"); | ||
/* @TODO Do I need to check if I am already opened */ | ||
ttusbir->opened = 1; | ||
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for (i = 0; i < num_urbs; i++) { | ||
retval = usb_submit_urb(ttusbir->urb[i], GFP_KERNEL); | ||
if (retval) { | ||
err("%s: usb_submit_urb failed on urb %d", | ||
__func__, i); | ||
return retval; | ||
} | ||
} | ||
return 0; | ||
} | ||
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static void set_use_dec(void *data) | ||
{ | ||
struct ttusbir_device *ttusbir = data; | ||
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DPRINTK("Device closed\n"); | ||
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ttusbir->opened = 0; | ||
} | ||
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/*** USB specific functions ***/ | ||
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/* | ||
* This mapping table is used to do a very simple filtering of the | ||
* input signal. | ||
* For a value with at least 4 bits set it returns 0xFF otherwise | ||
* 0x00. For faster IR signals this can not be used. But for RC-5 we | ||
* still have about 14 samples per pulse/space, i.e. we sample with 14 | ||
* times higher frequency than the signal frequency | ||
*/ | ||
const unsigned char map_table[] = | ||
{ | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, | ||
0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, | ||
0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, | ||
0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, | ||
0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, | ||
0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, | ||
0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, | ||
0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, | ||
0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, | ||
0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, | ||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, | ||
0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, | ||
0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, | ||
0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, | ||
0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, | ||
0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, | ||
0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, | ||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF | ||
}; | ||
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static void urb_complete(struct urb *urb) | ||
{ | ||
struct ttusbir_device *ttusbir; | ||
unsigned char *buf; | ||
int i; | ||
int l; | ||
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ttusbir = urb->context; | ||
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if (!ttusbir->opened) | ||
return; | ||
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buf = (unsigned char *)urb->transfer_buffer; | ||
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for (i = 0; i < 128; i++) { | ||
/* Here we do the filtering and some kind of down sampling */ | ||
buf[i] = ~map_table[buf[i]]; | ||
if (ttusbir->last_pulse == buf[i]) { | ||
if (ttusbir->last_num < PULSE_MASK/63) | ||
ttusbir->last_num++; | ||
/* | ||
* else we are in a idle period and do not need to | ||
* increment any longer | ||
*/ | ||
} else { | ||
l = ttusbir->last_num * 62; /* about 62 = us/byte */ | ||
if (ttusbir->last_pulse) /* pulse or space? */ | ||
l |= PULSE_BIT; | ||
if (!lirc_buffer_full(&ttusbir->rbuf)) { | ||
lirc_buffer_write(&ttusbir->rbuf, (void *)&l); | ||
wake_up_interruptible(&ttusbir->rbuf.wait_poll); | ||
} | ||
ttusbir->last_num = 0; | ||
ttusbir->last_pulse = buf[i]; | ||
} | ||
} | ||
usb_submit_urb(urb, GFP_ATOMIC); /* keep data rolling :-) */ | ||
} | ||
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/* | ||
* Called whenever the USB subsystem thinks we could be the right driver | ||
* to handle this device | ||
*/ | ||
static int probe(struct usb_interface *intf, const struct usb_device_id *id) | ||
{ | ||
int alt_set, endp; | ||
int found = 0; | ||
int i, j; | ||
int struct_size; | ||
struct usb_host_interface *host_interf; | ||
struct usb_interface_descriptor *interf_desc; | ||
struct usb_host_endpoint *host_endpoint; | ||
struct ttusbir_device *ttusbir; | ||
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DPRINTK("Module ttusbir probe\n"); | ||
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/* To reduce memory fragmentation we use only one allocation */ | ||
struct_size = sizeof(struct ttusbir_device) + | ||
(sizeof(struct urb *) * num_urbs) + | ||
(sizeof(char *) * num_urbs) + | ||
(num_urbs * 128); | ||
ttusbir = kzalloc(struct_size, GFP_KERNEL); | ||
if (!ttusbir) | ||
return -ENOMEM; | ||
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ttusbir->urb = (struct urb **)((char *)ttusbir + | ||
sizeof(struct ttusbir_device)); | ||
ttusbir->buffer = (char **)((char *)ttusbir->urb + | ||
(sizeof(struct urb *) * num_urbs)); | ||
for (i = 0; i < num_urbs; i++) | ||
ttusbir->buffer[i] = (char *)ttusbir->buffer + | ||
(sizeof(char *)*num_urbs) + (i * 128); | ||
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ttusbir->usb_driver = &usb_driver; | ||
ttusbir->alt_setting = -1; | ||
/* @TODO check if error can be returned */ | ||
ttusbir->udev = usb_get_dev(interface_to_usbdev(intf)); | ||
ttusbir->interf = intf; | ||
ttusbir->last_pulse = 0x00; | ||
ttusbir->last_num = 0; | ||
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/* | ||
* Now look for interface setting we can handle | ||
* We are searching for the alt setting where end point | ||
* 0x82 has max packet size 16 | ||
*/ | ||
for (alt_set = 0; alt_set < intf->num_altsetting && !found; alt_set++) { | ||
host_interf = &intf->altsetting[alt_set]; | ||
interf_desc = &host_interf->desc; | ||
for (endp = 0; endp < interf_desc->bNumEndpoints; endp++) { | ||
host_endpoint = &host_interf->endpoint[endp]; | ||
if ((host_endpoint->desc.bEndpointAddress == 0x82) && | ||
(host_endpoint->desc.wMaxPacketSize == 0x10)) { | ||
ttusbir->alt_setting = alt_set; | ||
ttusbir->endpoint = endp; | ||
found = 1; | ||
break; | ||
} | ||
} | ||
} | ||
if (ttusbir->alt_setting != -1) | ||
DPRINTK("alt setting: %d\n", ttusbir->alt_setting); | ||
else { | ||
err("Could not find alternate setting\n"); | ||
kfree(ttusbir); | ||
return -EINVAL; | ||
} | ||
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/* OK lets setup this interface setting */ | ||
usb_set_interface(ttusbir->udev, 0, ttusbir->alt_setting); | ||
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/* Store device info in interface structure */ | ||
usb_set_intfdata(intf, ttusbir); | ||
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/* Register as a LIRC driver */ | ||
if (lirc_buffer_init(&ttusbir->rbuf, sizeof(int), 256) < 0) { | ||
err("Could not get memory for LIRC data buffer\n"); | ||
usb_set_intfdata(intf, NULL); | ||
kfree(ttusbir); | ||
return -ENOMEM; | ||
} | ||
strcpy(ttusbir->driver.name, "TTUSBIR"); | ||
ttusbir->driver.minor = -1; | ||
ttusbir->driver.code_length = 1; | ||
ttusbir->driver.sample_rate = 0; | ||
ttusbir->driver.data = ttusbir; | ||
ttusbir->driver.add_to_buf = NULL; | ||
ttusbir->driver.rbuf = &ttusbir->rbuf; | ||
ttusbir->driver.set_use_inc = set_use_inc; | ||
ttusbir->driver.set_use_dec = set_use_dec; | ||
ttusbir->driver.dev = &intf->dev; | ||
ttusbir->driver.owner = THIS_MODULE; | ||
ttusbir->driver.features = LIRC_CAN_REC_MODE2; | ||
ttusbir->minor = lirc_register_driver(&ttusbir->driver); | ||
if (ttusbir->minor < 0) { | ||
err("Error registering as LIRC driver\n"); | ||
usb_set_intfdata(intf, NULL); | ||
lirc_buffer_free(&ttusbir->rbuf); | ||
kfree(ttusbir); | ||
return -EIO; | ||
} | ||
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/* Allocate and setup the URB that we will use to talk to the device */ | ||
for (i = 0; i < num_urbs; i++) { | ||
ttusbir->urb[i] = usb_alloc_urb(8, GFP_KERNEL); | ||
if (!ttusbir->urb[i]) { | ||
err("Could not allocate memory for the URB\n"); | ||
for (j = i - 1; j >= 0; j--) | ||
kfree(ttusbir->urb[j]); | ||
lirc_buffer_free(&ttusbir->rbuf); | ||
lirc_unregister_driver(ttusbir->minor); | ||
kfree(ttusbir); | ||
usb_set_intfdata(intf, NULL); | ||
return -ENOMEM; | ||
} | ||
ttusbir->urb[i]->dev = ttusbir->udev; | ||
ttusbir->urb[i]->context = ttusbir; | ||
ttusbir->urb[i]->pipe = usb_rcvisocpipe(ttusbir->udev, | ||
ttusbir->endpoint); | ||
ttusbir->urb[i]->interval = 1; | ||
ttusbir->urb[i]->transfer_flags = URB_ISO_ASAP; | ||
ttusbir->urb[i]->transfer_buffer = &ttusbir->buffer[i][0]; | ||
ttusbir->urb[i]->complete = urb_complete; | ||
ttusbir->urb[i]->number_of_packets = 8; | ||
ttusbir->urb[i]->transfer_buffer_length = 128; | ||
for (j = 0; j < 8; j++) { | ||
ttusbir->urb[i]->iso_frame_desc[j].offset = j*16; | ||
ttusbir->urb[i]->iso_frame_desc[j].length = 16; | ||
} | ||
} | ||
return 0; | ||
} | ||
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/** | ||
* Called when the driver is unloaded or the device is unplugged | ||
*/ | ||
static void disconnect(struct usb_interface *intf) | ||
{ | ||
int i; | ||
struct ttusbir_device *ttusbir; | ||
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DPRINTK("Module ttusbir disconnect\n"); | ||
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ttusbir = (struct ttusbir_device *) usb_get_intfdata(intf); | ||
usb_set_intfdata(intf, NULL); | ||
lirc_unregister_driver(ttusbir->minor); | ||
DPRINTK("unregistered\n"); | ||
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for (i = 0; i < num_urbs; i++) { | ||
usb_kill_urb(ttusbir->urb[i]); | ||
usb_free_urb(ttusbir->urb[i]); | ||
} | ||
DPRINTK("URBs killed\n"); | ||
lirc_buffer_free(&ttusbir->rbuf); | ||
kfree(ttusbir); | ||
} | ||
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static int ttusbir_init_module(void) | ||
{ | ||
int result; | ||
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DPRINTK(KERN_DEBUG "Module ttusbir init\n"); | ||
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/* register this driver with the USB subsystem */ | ||
result = usb_register(&usb_driver); | ||
if (result) | ||
err("usb_register failed. Error number %d", result); | ||
return result; | ||
} | ||
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static void ttusbir_exit_module(void) | ||
{ | ||
printk(KERN_DEBUG "Module ttusbir exit\n"); | ||
usb_deregister(&usb_driver); | ||
} | ||
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module_init(ttusbir_init_module); | ||
module_exit(ttusbir_exit_module); |