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/*
* Copyright (C) 2005-2014 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/ir.h>
#define IR_MINOR 255
static DEFINE_MUTEX(ir_mutex);
static int ir_open_cnt; /* #times opened */
static int ir_open(struct inode *inode, struct file *file)
{
int ret;
mutex_lock(&ir_mutex);
if (0 == ir_open_cnt) {
ret = 0;
ir_open_cnt++;
} else {
ret = -1;
}
mutex_unlock(&ir_mutex);
return ret;
}
static int ir_release(struct inode *inode, struct file *file)
{
mutex_lock(&ir_mutex);
ir_open_cnt--;
mutex_unlock(&ir_mutex);
return 0;
}
static long ir_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct miscdevice *c;
void *devdata;
int ret = 0;
mutex_lock(&ir_mutex);
c = file->private_data;
if (!c) {
mutex_unlock(&ir_mutex);
return -EINVAL;
}
devdata = dev_get_drvdata(c->this_device);
if (!devdata) {
mutex_unlock(&ir_mutex);
return -EINVAL;
}
switch (cmd) {
case IR_GET_CARRIER_FREQS:
{
struct ir_carrier_freq ir_carrier;
int id;
if (copy_from_user(&ir_carrier,
arg,
sizeof(struct ir_carrier_freq))) {
ret = -EINVAL;
} else {
id = ir_carrier.id;
ret = ir_get_carrier_range(id,
&ir_carrier.min,
&ir_carrier.max);
if (0 == ret) {
if (copy_to_user(arg, &ir_carrier, sizeof(ir_carrier)))
ret = -EINVAL;
}
}
break;
}
case IR_GET_CARRIER_FREQS_NUM:
{
int num = ir_get_num_carrier_freqs();
if (copy_to_user(arg, &num, 1))
ret = -EINVAL;
break;
}
case IR_CFG_CARRIER:
{
int carrier = (int)(arg);
ir_config(devdata, carrier);
break;
}
case IR_DATA_TRANSMIT:
{
struct ir_data_pattern p;
int *pattern;
if (!arg) {
mutex_unlock(&ir_mutex);
return -EINVAL;
}
if (copy_from_user(&p, arg, sizeof(struct ir_data_pattern))) {
mutex_unlock(&ir_mutex);
return -EINVAL;
}
pattern = kzalloc(p.len*sizeof(int), GFP_KERNEL);
if (!pattern) {
mutex_unlock(&ir_mutex);
printk(KERN_ERR "memory allocate for IR pattern error.\n");
return -EINVAL;
}
if (copy_from_user(pattern, p.pattern, p.len*sizeof(int))) {
printk(KERN_ERR "memory allocate for IR pattern error.\n");
ret = -EINVAL;
} else {
ir_transmit(devdata, p.len, pattern, 1);
}
kfree(pattern);
break;
}
default:
break;
}
mutex_unlock(&ir_mutex);
return ret;
}
static const struct file_operations ir_fops = {
.owner = THIS_MODULE,
.open = ir_open,
.release = ir_release,
.unlocked_ioctl = ir_ioctl,
};
static struct miscdevice ir_miscdev = {
.minor = IR_MINOR,
.name = "ir",
.fops = &ir_fops,
};
void ir_device_register(const char *name, struct device *parent, void *devdata)
{
int ret;
ret = misc_register(&ir_miscdev);
dev_set_drvdata(ir_miscdev.this_device, devdata);
return ret;
}
EXPORT_SYMBOL(ir_device_register);
void ir_device_unregister(void)
{
misc_deregister(&ir_miscdev);
}
EXPORT_SYMBOL(ir_device_unregister);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("IR Low Abstract Layer");
MODULE_LICENSE("GPL");
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