blob: 3ba482d96c4b17c388fbf4b75c364879cc51a6b3 [file] [log] [blame]
/* ir-lirc-codec.c - ir-core to classic lirc interface bridge
*
* Copyright (C) 2010 by Jarod Wilson <jarod@redhat.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 version 2 of the License.
*
* 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.
*/
#include <linux/sched.h>
#include <linux/wait.h>
#include <media/lirc.h>
#include <media/lirc_dev.h>
#include <media/ir-core.h>
#include "ir-core-priv.h"
#define LIRCBUF_SIZE 256
/**
* ir_lirc_decode() - Send raw IR data to lirc_dev to be relayed to the
* lircd userspace daemon for decoding.
* @input_dev: the struct input_dev descriptor of the device
* @duration: the struct ir_raw_event descriptor of the pulse/space
*
* This function returns -EINVAL if the lirc interfaces aren't wired up.
*/
static int ir_lirc_decode(struct input_dev *input_dev, struct ir_raw_event ev)
{
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
if (!(ir_dev->raw->enabled_protocols & IR_TYPE_LIRC))
return 0;
if (!ir_dev->raw->lirc.drv || !ir_dev->raw->lirc.drv->rbuf)
return -EINVAL;
IR_dprintk(2, "LIRC data transfer started (%uus %s)\n",
TO_US(ev.duration), TO_STR(ev.pulse));
ir_dev->raw->lirc.lircdata += ev.duration / 1000;
if (ev.pulse)
ir_dev->raw->lirc.lircdata |= PULSE_BIT;
lirc_buffer_write(ir_dev->raw->lirc.drv->rbuf,
(unsigned char *) &ir_dev->raw->lirc.lircdata);
wake_up(&ir_dev->raw->lirc.drv->rbuf->wait_poll);
ir_dev->raw->lirc.lircdata = 0;
return 0;
}
static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf,
size_t n, loff_t *ppos)
{
struct lirc_codec *lirc;
struct ir_input_dev *ir_dev;
int *txbuf; /* buffer with values to transmit */
int ret = 0, count;
lirc = lirc_get_pdata(file);
if (!lirc)
return -EFAULT;
if (n % sizeof(int))
return -EINVAL;
count = n / sizeof(int);
if (count > LIRCBUF_SIZE || count % 2 == 0)
return -EINVAL;
txbuf = memdup_user(buf, n);
if (IS_ERR(txbuf))
return PTR_ERR(txbuf);
ir_dev = lirc->ir_dev;
if (!ir_dev) {
ret = -EFAULT;
goto out;
}
if (ir_dev->props && ir_dev->props->tx_ir)
ret = ir_dev->props->tx_ir(ir_dev->props->priv, txbuf, (u32)n);
out:
kfree(txbuf);
return ret;
}
static long ir_lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
{
struct lirc_codec *lirc;
struct ir_input_dev *ir_dev;
int ret = 0;
void *drv_data;
unsigned long val;
lirc = lirc_get_pdata(filep);
if (!lirc)
return -EFAULT;
ir_dev = lirc->ir_dev;
if (!ir_dev || !ir_dev->props || !ir_dev->props->priv)
return -EFAULT;
drv_data = ir_dev->props->priv;
switch (cmd) {
case LIRC_SET_TRANSMITTER_MASK:
ret = get_user(val, (unsigned long *)arg);
if (ret)
return ret;
if (ir_dev->props && ir_dev->props->s_tx_mask)
ret = ir_dev->props->s_tx_mask(drv_data, (u32)val);
else
return -EINVAL;
break;
case LIRC_SET_SEND_CARRIER:
ret = get_user(val, (unsigned long *)arg);
if (ret)
return ret;
if (ir_dev->props && ir_dev->props->s_tx_carrier)
ir_dev->props->s_tx_carrier(drv_data, (u32)val);
else
return -EINVAL;
break;
case LIRC_GET_SEND_MODE:
val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
ret = put_user(val, (unsigned long *)arg);
break;
case LIRC_SET_SEND_MODE:
ret = get_user(val, (unsigned long *)arg);
if (ret)
return ret;
if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
return -EINVAL;
break;
default:
return lirc_dev_fop_ioctl(filep, cmd, arg);
}
return ret;
}
static int ir_lirc_open(void *data)
{
return 0;
}
static void ir_lirc_close(void *data)
{
return;
}
static struct file_operations lirc_fops = {
.owner = THIS_MODULE,
.write = ir_lirc_transmit_ir,
.unlocked_ioctl = ir_lirc_ioctl,
.read = lirc_dev_fop_read,
.poll = lirc_dev_fop_poll,
.open = lirc_dev_fop_open,
.release = lirc_dev_fop_close,
};
static int ir_lirc_register(struct input_dev *input_dev)
{
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
struct lirc_driver *drv;
struct lirc_buffer *rbuf;
int rc = -ENOMEM;
unsigned long features;
drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
if (!drv)
return rc;
rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
if (!rbuf)
goto rbuf_alloc_failed;
rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);
if (rc)
goto rbuf_init_failed;
features = LIRC_CAN_REC_MODE2;
if (ir_dev->props->tx_ir) {
features |= LIRC_CAN_SEND_PULSE;
if (ir_dev->props->s_tx_mask)
features |= LIRC_CAN_SET_TRANSMITTER_MASK;
if (ir_dev->props->s_tx_carrier)
features |= LIRC_CAN_SET_SEND_CARRIER;
}
snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
ir_dev->driver_name);
drv->minor = -1;
drv->features = features;
drv->data = &ir_dev->raw->lirc;
drv->rbuf = rbuf;
drv->set_use_inc = &ir_lirc_open;
drv->set_use_dec = &ir_lirc_close;
drv->code_length = sizeof(struct ir_raw_event) * 8;
drv->fops = &lirc_fops;
drv->dev = &ir_dev->dev;
drv->owner = THIS_MODULE;
drv->minor = lirc_register_driver(drv);
if (drv->minor < 0) {
rc = -ENODEV;
goto lirc_register_failed;
}
ir_dev->raw->lirc.drv = drv;
ir_dev->raw->lirc.ir_dev = ir_dev;
ir_dev->raw->lirc.lircdata = PULSE_MASK;
return 0;
lirc_register_failed:
rbuf_init_failed:
kfree(rbuf);
rbuf_alloc_failed:
kfree(drv);
return rc;
}
static int ir_lirc_unregister(struct input_dev *input_dev)
{
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
struct lirc_codec *lirc = &ir_dev->raw->lirc;
lirc_unregister_driver(lirc->drv->minor);
lirc_buffer_free(lirc->drv->rbuf);
kfree(lirc->drv);
return 0;
}
static struct ir_raw_handler lirc_handler = {
.protocols = IR_TYPE_LIRC,
.decode = ir_lirc_decode,
.raw_register = ir_lirc_register,
.raw_unregister = ir_lirc_unregister,
};
static int __init ir_lirc_codec_init(void)
{
ir_raw_handler_register(&lirc_handler);
printk(KERN_INFO "IR LIRC bridge handler initialized\n");
return 0;
}
static void __exit ir_lirc_codec_exit(void)
{
ir_raw_handler_unregister(&lirc_handler);
}
module_init(ir_lirc_codec_init);
module_exit(ir_lirc_codec_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>");
MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
MODULE_DESCRIPTION("LIRC IR handler bridge");