- 根目录:
- drivers
- media
- rc
- ir-lirc-codec.c
/* ir-lirc-codec.c - rc-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 <linux/module.h>
#include <media/lirc.h>
#include <media/lirc_dev.h>
#include <media/rc-core.h>
#include "rc-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 rc_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 rc_dev *dev, struct ir_raw_event ev)
{
struct lirc_codec *lirc = &dev->raw->lirc;
int sample;
if (!(dev->enabled_protocols & RC_BIT_LIRC))
return 0;
if (!dev->raw->lirc.drv || !dev->raw->lirc.drv->rbuf)
return -EINVAL;
/* Packet start */
if (ev.reset)
return 0;
/* Carrier reports */
if (ev.carrier_report) {
sample = LIRC_FREQUENCY(ev.carrier);
IR_dprintk(2, "carrier report (freq: %d)\n", sample);
/* Packet end */
} else if (ev.timeout) {
if (lirc->gap)
return 0;
lirc->gap_start = ktime_get();
lirc->gap = true;
lirc->gap_duration = ev.duration;
if (!lirc->send_timeout_reports)
return 0;
sample = LIRC_TIMEOUT(ev.duration / 1000);
IR_dprintk(2, "timeout report (duration: %d)\n", sample);
/* Normal sample */
} else {
if (lirc->gap) {
int gap_sample;
lirc->gap_duration += ktime_to_ns(ktime_sub(ktime_get(),
lirc->gap_start));
/* Convert to ms and cap by LIRC_VALUE_MASK */
do_div(lirc->gap_duration, 1000);
lirc->gap_duration = min(lirc->gap_duration,
(u64)LIRC_VALUE_MASK);
gap_sample = LIRC_SPACE(lirc->gap_duration);
lirc_buffer_write(dev->raw->lirc.drv->rbuf,
(unsigned char *) &gap_sample);
lirc->gap = false;
}
sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) :
LIRC_SPACE(ev.duration / 1000);
IR_dprintk(2, "delivering %uus %s to lirc_dev\n",
TO_US(ev.duration), TO_STR(ev.pulse));
}
lirc_buffer_write(dev->raw->lirc.drv->rbuf,
(unsigned char *) &sample);
wake_up(&dev->raw->lirc.drv->rbuf->wait_poll);
return 0;
}
static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf,
size_t n, loff_t *ppos)
{
struct lirc_codec *lirc;
struct rc_dev *dev;
unsigned int *txbuf; /* buffer with values to transmit */
ssize_t ret = -EINVAL;
size_t count;
ktime_t start;
s64 towait;
unsigned int duration = 0; /* signal duration in us */
int i;
start = ktime_get();
lirc = lirc_get_pdata(file);
if (!lirc)
return -EFAULT;
if (n < sizeof(unsigned) || n % sizeof(unsigned))
return -EINVAL;
count = n / sizeof(unsigned);
if (count > LIRCBUF_SIZE || count % 2 == 0)
return -EINVAL;
txbuf = memdup_user(buf, n);
if (IS_ERR(txbuf))
return PTR_ERR(txbuf);
dev = lirc->dev;
if (!dev) {
ret = -EFAULT;
goto out;
}
if (!dev->tx_ir) {
ret = -ENOSYS;
goto out;
}
for (i = 0; i < count; i++) {
if (txbuf[i] > IR_MAX_DURATION / 1000 - duration || !txbuf[i]) {
ret = -EINVAL;
goto out;
}
duration += txbuf[i];
}
ret = dev->tx_ir(dev, txbuf, count);
if (ret < 0)
goto out;
for (duration = i = 0; i < ret; i++)
duration += txbuf[i];
ret *= sizeof(unsigned int);
/*
* The lircd gap calculation expects the write function to
* wait for the actual IR signal to be transmitted before
* returning.
*/
towait = ktime_us_delta(ktime_add_us(start, duration), ktime_get());
if (towait > 0) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(usecs_to_jiffies(towait));
}
out:
kfree(txbuf);
return ret;
}
static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
unsigned long arg)
{
struct lirc_codec *lirc;
struct rc_dev *dev;
u32 __user *argp = (u32 __user *)(arg);
int ret = 0;
__u32 val = 0, tmp;
lirc = lirc_get_pdata(filep);
if (!lirc)
return -EFAULT;
dev = lirc->dev;
if (!dev)
return -EFAULT;
if (_IOC_DIR(cmd) & _IOC_WRITE) {
ret = get_user(val, argp);
if (ret)
return ret;
}
switch (cmd) {
/* legacy support */
case LIRC_GET_SEND_MODE:
val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
break;
case LIRC_SET_SEND_MODE:
if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
return -EINVAL;
return 0;
/* TX settings */
case LIRC_SET_TRANSMITTER_MASK:
if (!dev->s_tx_mask)
return -ENOSYS;
return dev->s_tx_mask(dev, val);
case LIRC_SET_SEND_CARRIER:
if (!dev->s_tx_carrier)
return -ENOSYS;
return dev->s_tx_carrier(dev, val);
case LIRC_SET_SEND_DUTY_CYCLE:
if (!dev->s_tx_duty_cycle)
return -ENOSYS;
if (val <= 0 || val >= 100)
return -EINVAL;
return dev->s_tx_duty_cycle(dev, val);
/* RX settings */
case LIRC_SET_REC_CARRIER:
if (!dev->s_rx_carrier_range)
return -ENOSYS;
if (val <= 0)
return -EINVAL;
return dev->s_rx_carrier_range(dev,
dev->raw->lirc.carrier_low,
val);
case LIRC_SET_REC_CARRIER_RANGE:
if (val <= 0)
return -EINVAL;
dev->raw->lirc.carrier_low = val;
return 0;
case LIRC_GET_REC_RESOLUTION:
val = dev->rx_resolution;
break;
case LIRC_SET_WIDEBAND_RECEIVER:
if (!dev->s_learning_mode)
return -ENOSYS;
return dev->s_learning_mode(dev, !!val);
case LIRC_SET_MEASURE_CARRIER_MODE:
if (!dev->s_carrier_report)
return -ENOSYS;
return dev->s_carrier_report(dev, !!val);
/* Generic timeout support */
case LIRC_GET_MIN_TIMEOUT:
if (!dev->max_timeout)
return -ENOSYS;
val = dev->min_timeout / 1000;
break;
case LIRC_GET_MAX_TIMEOUT:
if (!dev->max_timeout)
return -ENOSYS;
val = dev->max_timeout / 1000;
break;
case LIRC_SET_REC_TIMEOUT:
if (!dev->max_timeout)
return -ENOSYS;
tmp = val * 1000;
if (tmp < dev->min_timeout ||
tmp > dev->max_timeout)
return -EINVAL;
dev->timeout = tmp;
break;
case LIRC_SET_REC_TIMEOUT_REPORTS:
lirc->send_timeout_reports = !!val;
break;
default:
return lirc_dev_fop_ioctl(filep, cmd, arg);
}
if (_IOC_DIR(cmd) & _IOC_READ)
ret = put_user(val, argp);
return ret;
}
static int ir_lirc_open(void *data)
{
return 0;
}
static void ir_lirc_close(void *data)
{
return;
}
static const struct file_operations lirc_fops = {
.owner = THIS_MODULE,
.write = ir_lirc_transmit_ir,
.unlocked_ioctl = ir_lirc_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ir_lirc_ioctl,
#endif
.read = lirc_dev_fop_read,
.poll = lirc_dev_fop_poll,
.open = lirc_dev_fop_open,
.release = lirc_dev_fop_close,
.llseek = no_llseek,
};
static int ir_lirc_register(struct rc_dev *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 (dev->tx_ir) {
features |= LIRC_CAN_SEND_PULSE;
if (dev->s_tx_mask)
features |= LIRC_CAN_SET_TRANSMITTER_MASK;
if (dev->s_tx_carrier)
features |= LIRC_CAN_SET_SEND_CARRIER;
if (dev->s_tx_duty_cycle)
features |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
}
if (dev->s_rx_carrier_range)
features |= LIRC_CAN_SET_REC_CARRIER |
LIRC_CAN_SET_REC_CARRIER_RANGE;
if (dev->s_learning_mode)
features |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
if (dev->s_carrier_report)
features |= LIRC_CAN_MEASURE_CARRIER;
if (dev->max_timeout)
features |= LIRC_CAN_SET_REC_TIMEOUT;
snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
dev->driver_name);
drv->minor = -1;
drv->features = features;
drv->data = &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 = &dev->dev;
drv->rdev = dev;
drv->owner = THIS_MODULE;
drv->minor = lirc_register_driver(drv);
if (drv->minor < 0) {
rc = -ENODEV;
goto lirc_register_failed;
}
dev->raw->lirc.drv = drv;
dev->raw->lirc.dev = dev;
return 0;
lirc_register_failed:
rbuf_init_failed:
kfree(rbuf);
rbuf_alloc_failed:
kfree(drv);
return rc;
}
static int ir_lirc_unregister(struct rc_dev *dev)
{
struct lirc_codec *lirc = &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 = RC_BIT_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");