blob: 83da95df1e07e133611c351ad4f9253366d909c2 [file] [log] [blame]
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/ioctl.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include <linux/slab.h>
#include <media/rc-core.h>
#include <media/user-rc-input.h>
#define MAX_SP_DEVICES 1
#define USER_SP_INPUT_DEV_NAME "user-sp-input"
#define USER_SP_INPUT_DRV_NAME "sp-user-input"
struct user_sp_input_dev {
struct cdev sp_input_cdev;
struct class *sp_input_class;
struct device *sp_input_dev;
struct rc_dev *spdev;
dev_t sp_input_base_dev;
struct device *dev;
int in_use;
};
static int user_sp_input_open(struct inode *inode, struct file *file)
{
struct cdev *input_cdev = inode->i_cdev;
struct user_sp_input_dev *input_dev =
container_of(input_cdev, struct user_sp_input_dev, sp_input_cdev);
if (input_dev->in_use) {
dev_err(input_dev->dev,
"Device is already open..only one instance is allowed\n");
return -EBUSY;
}
input_dev->in_use++;
file->private_data = input_dev;
return 0;
}
static int user_sp_input_release(struct inode *inode, struct file *file)
{
struct user_sp_input_dev *input_dev = file->private_data;
input_dev->in_use--;
return 0;
}
static ssize_t user_sp_input_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
int ret = count;
struct user_sp_input_dev *input_dev = file->private_data;
unsigned char cmd = 0;
int scancode = 0;
if (copy_from_user(&cmd, buffer, 1)) {
dev_err(input_dev->dev, "Copy from user failed\n");
ret = -EFAULT;
goto out_free;
}
if (copy_from_user(&scancode, &buffer[1], 4)) {
dev_err(input_dev->dev, "Copy from user failed\n");
ret = -EFAULT;
goto out_free;
}
switch (cmd) {
case USER_CONTROL_PRESSED:
dev_dbg(input_dev->dev, "user controlled pressed 0x%x\n",
scancode);
rc_keydown(input_dev->spdev, scancode, 0);
break;
case USER_CONTROL_REPEATED:
dev_dbg(input_dev->dev, "user controlled repeated 0x%x\n",
scancode);
rc_repeat(input_dev->spdev);
break;
case USER_CONTROL_RELEASED:
dev_dbg(input_dev->dev, "user controlled released 0x%x\n",
scancode);
rc_keyup(input_dev->spdev);
break;
}
out_free:
return ret;
}
const struct file_operations sp_fops = {
.owner = THIS_MODULE,
.open = user_sp_input_open,
.write = user_sp_input_write,
.release = user_sp_input_release,
};
static int __devinit user_sp_input_probe(struct platform_device *pdev)
{
struct user_sp_input_dev *user_sp_dev;
struct rc_dev *spdev;
int retval;
user_sp_dev = kzalloc(sizeof(struct user_sp_input_dev), GFP_KERNEL);
if (!user_sp_dev)
return -ENOMEM;
user_sp_dev->sp_input_class = class_create(THIS_MODULE,
"user-sp-input-loopback");
if (IS_ERR(user_sp_dev->sp_input_class)) {
retval = PTR_ERR(user_sp_dev->sp_input_class);
goto err;
}
retval = alloc_chrdev_region(&user_sp_dev->sp_input_base_dev, 0,
MAX_SP_DEVICES, USER_SP_INPUT_DEV_NAME);
if (retval) {
dev_err(&pdev->dev,
"alloc_chrdev_region failed\n");
goto alloc_chrdev_err;
}
dev_info(&pdev->dev, "User space report standby key event input" \
" driver registered, major %d\n",
MAJOR(user_sp_dev->sp_input_base_dev));
cdev_init(&user_sp_dev->sp_input_cdev, &sp_fops);
retval = cdev_add(&user_sp_dev->sp_input_cdev,
user_sp_dev->sp_input_base_dev, MAX_SP_DEVICES);
if (retval) {
dev_err(&pdev->dev, "cdev_add failed\n");
goto cdev_add_err;
}
user_sp_dev->sp_input_dev = device_create(user_sp_dev->sp_input_class,
NULL, MKDEV(MAJOR(user_sp_dev->sp_input_base_dev), 0), NULL,
"user-sp-input-dev%d", 0);
if (IS_ERR(user_sp_dev->sp_input_dev)) {
retval = PTR_ERR(user_sp_dev->sp_input_dev);
dev_err(&pdev->dev, "device_create failed\n");
goto device_create_err;
}
spdev = rc_allocate_device();
if (!spdev) {
dev_err(&pdev->dev, "failed to allocate rc device");
retval = -ENOMEM;
goto err_allocate_device;
}
spdev->driver_type = RC_DRIVER_SCANCODE;
spdev->allowed_protos = RC_TYPE_OTHER;
spdev->input_name = USER_SP_INPUT_DEV_NAME;
spdev->input_id.bustype = BUS_HOST;
spdev->driver_name = USER_SP_INPUT_DRV_NAME;
spdev->map_name = RC_MAP_RC6_PHILIPS;
retval = rc_register_device(spdev);
if (retval < 0) {
dev_err(&pdev->dev, "failed to register rc device\n");
goto rc_register_err;
}
user_sp_dev->spdev = spdev;
user_sp_dev->dev = &pdev->dev;
platform_set_drvdata(pdev, user_sp_dev);
user_sp_dev->in_use = 0;
return 0;
rc_register_err:
rc_free_device(spdev);
err_allocate_device:
device_destroy(user_sp_dev->sp_input_class,
MKDEV(MAJOR(user_sp_dev->sp_input_base_dev), 0));
cdev_add_err:
unregister_chrdev_region(user_sp_dev->sp_input_base_dev,
MAX_SP_DEVICES);
device_create_err:
cdev_del(&user_sp_dev->sp_input_cdev);
alloc_chrdev_err:
class_destroy(user_sp_dev->sp_input_class);
err:
kfree(user_sp_dev);
return retval;
}
static int __devexit user_sp_input_remove(struct platform_device *pdev)
{
struct user_sp_input_dev *user_sp_dev = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
rc_free_device(user_sp_dev->spdev);
device_destroy(user_sp_dev->sp_input_class,
MKDEV(MAJOR(user_sp_dev->sp_input_base_dev), 0));
unregister_chrdev_region(user_sp_dev->sp_input_base_dev,
MAX_SP_DEVICES);
cdev_del(&user_sp_dev->sp_input_cdev);
class_destroy(user_sp_dev->sp_input_class);
kfree(user_sp_dev);
return 0;
}
static struct platform_driver user_sp_input_driver = {
.probe = user_sp_input_probe,
.remove = __devexit_p(user_sp_input_remove),
.driver = {
.name = USER_SP_INPUT_DRV_NAME,
.owner = THIS_MODULE,
},
};
static int __init user_sp_input_init(void)
{
return platform_driver_register(&user_sp_input_driver);
}
module_init(user_sp_input_init);
static void __exit user_sp_input_exit(void)
{
platform_driver_unregister(&user_sp_input_driver);
}
module_exit(user_sp_input_exit);
MODULE_DESCRIPTION("User SP RC Input driver");
MODULE_LICENSE("GPL v2");