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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/sched/signal.h>
#include <linux/ioctl.h>
#include <linux/poll.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include <linux/idr.h>
#include "rc-core-priv.h"
#include <media/lirc.h>
#include <media/lirc_dev.h>
#define LOGHEAD "lirc_dev (%s[%d]): "
static dev_t lirc_base_dev;
/* Used to keep track of allocated lirc devices */
#define LIRC_MAX_DEVICES 256
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 lirc_dev *d = container_of(ld, struct lirc_dev, dev);
struct rc_dev *rcdev = d->rdev;
if (rcdev->driver_type == RC_DRIVER_IR_RAW)
kfifo_free(&rcdev->rawir);
kfree(d);
module_put(THIS_MODULE);
put_device(d->dev.parent);
}
struct lirc_dev *
lirc_allocate_device(void)
{
struct lirc_dev *d;
d = kzalloc(sizeof(*d), GFP_KERNEL);
if (d) {
device_initialize(&d->dev);
d->dev.class = lirc_class;
d->dev.release = lirc_release_device;
__module_get(THIS_MODULE);
}
return d;
}
EXPORT_SYMBOL(lirc_allocate_device);
void lirc_free_device(struct lirc_dev *d)
{
if (!d)
return;
put_device(&d->dev);
}
EXPORT_SYMBOL(lirc_free_device);
int lirc_register_device(struct lirc_dev *d)
{
struct rc_dev *rcdev = d->rdev;
int minor;
int err;
if (!d) {
pr_err("driver pointer must be not NULL!\n");
return -EBADRQC;
}
if (!d->dev.parent) {
pr_err("dev parent pointer not filled in!\n");
return -EINVAL;
}
if (!d->fops) {
pr_err("fops pointer not filled in!\n");
return -EINVAL;
}
/* some safety check 8-) */
d->name[sizeof(d->name) - 1] = '\0';
if (rcdev->driver_type == RC_DRIVER_IR_RAW) {
if (kfifo_alloc(&rcdev->rawir, MAX_IR_EVENT_SIZE, GFP_KERNEL))
return -ENOMEM;
}
init_waitqueue_head(&rcdev->wait_poll);
minor = ida_simple_get(&lirc_ida, 0, LIRC_MAX_DEVICES, GFP_KERNEL);
if (minor < 0)
return minor;
d->minor = minor;
d->dev.devt = MKDEV(MAJOR(lirc_base_dev), d->minor);
dev_set_name(&d->dev, "lirc%d", d->minor);
cdev_init(&d->cdev, d->fops);
d->cdev.owner = d->owner;
err = cdev_device_add(&d->cdev, &d->dev);
if (err) {
ida_simple_remove(&lirc_ida, minor);
return err;
}
get_device(d->dev.parent);
dev_info(&d->dev, "lirc_dev: driver %s registered at minor = %d\n",
d->name, d->minor);
return 0;
}
EXPORT_SYMBOL(lirc_register_device);
void lirc_unregister_device(struct lirc_dev *d)
{
struct rc_dev *rcdev;
if (!d)
return;
rcdev = d->rdev;
dev_dbg(&d->dev, "lirc_dev: driver %s unregistered from minor = %d\n",
d->name, d->minor);
mutex_lock(&rcdev->lock);
if (rcdev->lirc_open) {
dev_dbg(&d->dev, LOGHEAD "releasing opened driver\n",
d->name, d->minor);
wake_up_poll(&rcdev->wait_poll, POLLHUP);
}
mutex_unlock(&rcdev->lock);
cdev_device_del(&d->cdev, &d->dev);
ida_simple_remove(&lirc_ida, d->minor);
put_device(&d->dev);
}
EXPORT_SYMBOL(lirc_unregister_device);
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, LIRC_MAX_DEVICES,
"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, LIRC_MAX_DEVICES);
}
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