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/*
* Japan Display Inc. INPUT_MT_WRAPPER Device Driver
*
* Copyright (C) 2013-2014 Japan Display Inc.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/input/input_mt_wrapper.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#define DEVICE_NAME "input_mt_wrapper"
static int input_mt_wrapper_open(struct inode *inode, struct file *filp);
static int input_mt_wrapper_release(struct inode *inode, struct file *filp);
static long input_mt_wrapper_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg);
static long input_mt_wrapper_ioctl_set_coordinate(unsigned long arg);
static const struct file_operations g_input_mt_wrapper_fops = {
.owner = THIS_MODULE,
.open = input_mt_wrapper_open,
.release = input_mt_wrapper_release,
.unlocked_ioctl = input_mt_wrapper_ioctl,
};
static struct miscdevice g_input_mt_wrapper_misc_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &g_input_mt_wrapper_fops,
};
struct input_dev *g_input_dev;
static int __init input_mt_wrapper_init(void)
{
struct input_dev *input_dev;
int error;
input_dev = input_allocate_device();
if (!input_dev) {
pr_err("Unable to allocated input device\n");
return -ENOMEM;
}
input_dev->name = "input_mt_wrapper";
__set_bit(EV_SYN, input_dev->evbit);
__set_bit(EV_ABS, input_dev->evbit);
input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
0, 1, 0, 0);
input_set_abs_params(input_dev, ABS_MT_TRACKING_ID,
0, 9, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_X,
INPUT_MT_WRAPPER_MIN_X, INPUT_MT_WRAPPER_MAX_X, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
INPUT_MT_WRAPPER_MIN_Y, INPUT_MT_WRAPPER_MAX_Y, 0, 0);
input_set_abs_params(input_dev, ABS_MT_PRESSURE,
INPUT_MT_WRAPPER_MIN_Z, INPUT_MT_WRAPPER_MAX_Z, 0, 0);
error = input_register_device(input_dev);
if (error) {
pr_err("Failed to register %s input device\n", input_dev->name);
return error;
}
error = misc_register(&g_input_mt_wrapper_misc_device);
if (error) {
pr_err("Failed to register misc device\n");
input_unregister_device(input_dev);
return error;
}
g_input_dev = input_dev;
return 0;
}
static void __exit input_mt_wrapper_exit(void)
{
input_unregister_device(g_input_dev);
misc_deregister(&g_input_mt_wrapper_misc_device);
}
module_init(input_mt_wrapper_init);
module_exit(input_mt_wrapper_exit);
MODULE_AUTHOR("Japan Display Inc");
MODULE_DESCRIPTION("Input Multitouch Wrapper.");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("input:input_mt_wrapper");
static int input_mt_wrapper_open(struct inode *inode, struct file *filp)
{
return 0;
}
static int input_mt_wrapper_release(struct inode *inode, struct file *filp)
{
return 0;
}
static long input_mt_wrapper_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
long ret;
switch (cmd) {
case INPUT_MT_WRAPPER_IOCTL_CMD_SET_COORDINATES:
ret = input_mt_wrapper_ioctl_set_coordinate(arg);
return ret;
default:
pr_err("%s: cmd unkown.\n", __func__);
return -EINVAL;
}
return 0;
}
static long input_mt_wrapper_ioctl_set_coordinate(unsigned long arg)
{
long ret = 0;
void __user *argp = (void __user *)arg;
struct input_dev *input_dev = g_input_dev;
struct input_mt_wrapper_ioctl_touch_data data;
u8 i;
u8 count = 0;
if (arg == 0) {
pr_err("%s: arg == 0.\n", __func__);
return -EINVAL;
}
if (copy_from_user(&data, argp,
sizeof(struct input_mt_wrapper_ioctl_touch_data))) {
pr_err("%s: Failed to copy_from_user().\n", __func__);
return -EFAULT;
}
if (data.t_num) {
for (i = 0; i < INPUT_MT_WRAPPER_MAX_FINGERS; i++) {
if (data.touch[i].z != 0) {
input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR,
1);
input_report_abs(input_dev, ABS_MT_TRACKING_ID,
(data.touch[i].t));
input_report_abs(input_dev, ABS_MT_POSITION_X,
data.touch[i].x);
input_report_abs(input_dev, ABS_MT_POSITION_Y,
data.touch[i].y);
input_report_abs(input_dev, ABS_MT_PRESSURE,
data.touch[i].z);
input_mt_sync(input_dev);
count++;
}
}
}
/* SYN_MT_REPORT only if no contact */
if (!count)
input_mt_sync(input_dev);
/* SYN_REPORT */
input_sync(input_dev);
return ret;
}
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