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/*
* LIRC base driver
*
* by Artur Lipowski <alipowski@interia.pl>
*
* 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.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/poll.h>
#include "rc-core-priv.h"
#include <media/lirc.h>
#define LOGHEAD "lirc_dev (%s[%d]): "
static dev_t lirc_base_dev;
/* Used to keep track of allocated lirc devices */
static DEFINE_IDA(lirc_ida);
/* Only used for sysfs but defined to void otherwise */
static struct class *lirc_class;
static void lirc_release_device(struct device *ld)
{
struct rc_dev *rcdev = container_of(ld, struct rc_dev, lirc_dev);
if (rcdev->driver_type == RC_DRIVER_IR_RAW)
kfifo_free(&rcdev->rawir);
if (rcdev->driver_type != RC_DRIVER_IR_RAW_TX)
kfifo_free(&rcdev->scancodes);
put_device(&rcdev->dev);
}
int ir_lirc_register(struct rc_dev *dev)
{
int err, minor;
device_initialize(&dev->lirc_dev);
dev->lirc_dev.class = lirc_class;
dev->lirc_dev.release = lirc_release_device;
dev->send_mode = LIRC_MODE_PULSE;
if (dev->driver_type == RC_DRIVER_SCANCODE)
dev->rec_mode = LIRC_MODE_SCANCODE;
else
dev->rec_mode = LIRC_MODE_MODE2;
if (dev->driver_type == RC_DRIVER_IR_RAW) {
if (kfifo_alloc(&dev->rawir, MAX_IR_EVENT_SIZE, GFP_KERNEL))
return -ENOMEM;
}
if (dev->driver_type != RC_DRIVER_IR_RAW_TX) {
if (kfifo_alloc(&dev->scancodes, 32, GFP_KERNEL)) {
kfifo_free(&dev->rawir);
return -ENOMEM;
}
}
init_waitqueue_head(&dev->wait_poll);
minor = ida_simple_get(&lirc_ida, 0, RC_DEV_MAX, GFP_KERNEL);
if (minor < 0) {
err = minor;
goto out_kfifo;
}
dev->lirc_dev.parent = &dev->dev;
dev->lirc_dev.devt = MKDEV(MAJOR(lirc_base_dev), minor);
dev_set_name(&dev->lirc_dev, "lirc%d", minor);
cdev_init(&dev->lirc_cdev, &lirc_fops);
err = cdev_device_add(&dev->lirc_cdev, &dev->lirc_dev);
if (err)
goto out_ida;
get_device(&dev->dev);
dev_info(&dev->dev, "lirc_dev: driver %s registered at minor = %d",
dev->driver_name, minor);
return 0;
out_ida:
ida_simple_remove(&lirc_ida, minor);
out_kfifo:
if (dev->driver_type == RC_DRIVER_IR_RAW)
kfifo_free(&dev->rawir);
if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
kfifo_free(&dev->scancodes);
return err;
}
void ir_lirc_unregister(struct rc_dev *dev)
{
dev_dbg(&dev->dev, "lirc_dev: driver %s unregistered from minor = %d\n",
dev->driver_name, MINOR(dev->lirc_dev.devt));
mutex_lock(&dev->lock);
if (dev->lirc_open) {
dev_dbg(&dev->dev, LOGHEAD "releasing opened driver\n",
dev->driver_name, MINOR(dev->lirc_dev.devt));
wake_up_poll(&dev->wait_poll, POLLHUP);
}
mutex_unlock(&dev->lock);
cdev_device_del(&dev->lirc_cdev, &dev->lirc_dev);
ida_simple_remove(&lirc_ida, MINOR(dev->lirc_dev.devt));
put_device(&dev->lirc_dev);
}
int __init lirc_dev_init(void)
{
int retval;
lirc_class = class_create(THIS_MODULE, "lirc");
if (IS_ERR(lirc_class)) {
pr_err("class_create failed\n");
return PTR_ERR(lirc_class);
}
retval = alloc_chrdev_region(&lirc_base_dev, 0, RC_DEV_MAX,
"BaseRemoteCtl");
if (retval) {
class_destroy(lirc_class);
pr_err("alloc_chrdev_region failed\n");
return retval;
}
pr_info("IR Remote Control driver registered, major %d\n",
MAJOR(lirc_base_dev));
return 0;
}
void __exit lirc_dev_exit(void)
{
class_destroy(lirc_class);
unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX);
}
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