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/*
* drivers/video/tegra/overlay/dc_input.c
*
* Copyright (c) 2010-2011, NVIDIA Corporation.
*
* 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.
*
* 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/input.h>
#include <linux/slab.h>
#include <linux/miscdevice.h>
#include "dc_input.h"
struct dc_input {
struct input_dev *dev;
char name[40];
atomic_t listeners;
};
static int dc_input_open(struct input_dev *dev)
{
struct dc_input *data = input_get_drvdata(dev);
if (data)
atomic_inc(&data->listeners);
return 0;
}
static void dc_input_close(struct input_dev *dev)
{
struct dc_input *data = input_get_drvdata(dev);
if (data)
atomic_dec(&data->listeners);
}
struct dc_input *dc_input_alloc()
{
return kzalloc(sizeof(struct dc_input), GFP_KERNEL);
}
int dc_input_init(struct miscdevice *par_dev,
struct dc_input *data)
{
if (!data)
return -EINVAL;
atomic_set(&data->listeners, 0);
data->dev = input_allocate_device();
if (!data->dev)
return -ENOMEM;
snprintf(data->name, sizeof(data->name),
"%s.input_tick", par_dev->name);
data->dev->name = data->name;
/* TODO need to set bus type or parent?*/
data->dev->open = dc_input_open;
data->dev->close = dc_input_close;
__set_bit(EV_SYN, data->dev->evbit);
__set_bit(EV_MSC, data->dev->evbit);
__set_bit(MSC_RAW, data->dev->mscbit);
input_set_drvdata(data->dev, data);
if (input_register_device(data->dev))
goto err_reg_failed;
return 0;
err_reg_failed:
input_free_device(data->dev);
data->dev = NULL;
return -ENOMEM;
}
void dc_input_destroy(struct dc_input *data)
{
if (!data || !data->dev)
return;
input_unregister_device(data->dev);
input_free_device(data->dev);
data->dev = NULL;
}
void dc_input_free(struct dc_input *data)
{
if (!data)
return;
kfree(data);
}
int notify_overlay_flip(struct dc_input *data)
{
int listeners;
if (!data)
return -EINVAL;
listeners = atomic_read(&data->listeners);
/* if noone is listening, don't send */
if (listeners) {
input_event(data->dev, EV_MSC, MSC_RAW, 1);
input_sync(data->dev);
}
return 0;
}
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