kernel-ark/drivers/media/rc/ir-lirc-codec.c
Srinivas Kandagatla ca7a722db1 [media] media: lirc: Allow lirc dev to talk to rc device
The use case is simple, if any rc device has allowed protocols =
RC_TYPE_LIRC and map_name = RC_MAP_LIRC set, the driver open will be never
called. The reason for this is, all of the key maps except lirc have some
KEYS in there map, so during rc_register_device process these keys are
matched against the input drivers and open is performed, so for the case
of RC_MAP_EMPTY, a vt/keyboard is matched and the driver open is
performed.
In case of lirc, there is no match and result is that there is no open
performed, however the lirc-dev will go ahead and create a /dev/lirc0
node. Now when lircd/mode2 opens this device, no data is available
because the driver was never opened.
Other case pointed by Sean Young, As rc device gets opened via the
input interface. If the input device is never opened (e.g. embedded with
no console) then the rc open is never called and lirc will not work
either. So that's another case.
lirc_dev seems to have no link with actual rc device w.r.t open/close.
This patch adds rc_dev pointer to lirc_driver structure for cases like
this, so that it can do the open/close of the real driver in accordance
to lircd/mode2 open/close.
Without this patch its impossible to open a rc device which has
RC_TYPE_LIRC ad RC_MAP_LIRC set.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
2013-07-31 16:30:27 -03:00

447 lines
9.4 KiB
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");