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/*
* drivers/input/misc/tegra_odm_scroll.c
*
* Scrollwheel input device using NVIDIA Tegra ODM kit
*
* Copyright (c) 2009, 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/module.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/kthread.h>
#include <mach/nvrm_linux.h>
#include <nvos.h>
#include <nvodm_scrollwheel.h>
struct tegra_scroll_dev {
struct input_dev *input_dev;
struct task_struct *task;
NvOdmOsSemaphoreHandle sem;
NvOdmScrollWheelHandle odm_dev;
};
static int scroll_thread(void *pdata)
{
struct tegra_scroll_dev *scroll = pdata;
NvOdmScrollWheelEvent Events;
/* FIXME add a terminating condition */
while(1) {
NvOdmOsSemaphoreWait(scroll->sem);
Events = NvOdmScrollWheelGetEvent(scroll->odm_dev);
if (Events & NvOdmScrollWheelEvent_RotateAntiClockWise) {
input_report_key(scroll->input_dev, KEY_UP, 1);
input_report_key(scroll->input_dev, KEY_UP, 0);
}
if (Events & NvOdmScrollWheelEvent_RotateClockWise) {
input_report_key(scroll->input_dev, KEY_DOWN, 1);
input_report_key(scroll->input_dev, KEY_DOWN, 0);
}
if (Events & NvOdmScrollWheelEvent_Press)
input_report_key(scroll->input_dev, KEY_ENTER, 1);
else if (Events & NvOdmScrollWheelEvent_Release)
input_report_key(scroll->input_dev, KEY_ENTER, 0);
}
return 0;
}
static int __init tegra_scroll_probe(struct platform_device *pdev)
{
struct tegra_scroll_dev *scroll = NULL;
struct input_dev *input_dev = NULL;
NvOdmOsSemaphoreHandle sem = NULL;
NvOdmScrollWheelHandle odm_dev = NULL;
int err;
NvOdmScrollWheelEvent events;
sem = NvOdmOsSemaphoreCreate(0);
if (!sem) {
pr_err("tegra_scroll_probe: Semaphore creation failed\n");
return -ENOMEM;
}
events = NvOdmScrollWheelEvent_Press |
NvOdmScrollWheelEvent_Release |
NvOdmScrollWheelEvent_RotateAntiClockWise |
NvOdmScrollWheelEvent_RotateClockWise;
odm_dev = NvOdmScrollWheelOpen(sem, events);
if (odm_dev == NULL) {
pr_err("tegra_scroll_probe: scroll wheel not found\n");
err = -ENXIO;
goto err_scrollWheelnotfound;
}
scroll = kzalloc(sizeof(struct tegra_scroll_dev), GFP_KERNEL);
input_dev = input_allocate_device();
if (input_dev == NULL || scroll == NULL) {
err = -ENOMEM;
pr_err("tegra_scroll_probe: Failed to allocate input device\n");
goto err_alloc_failed;
}
scroll->input_dev = input_dev;
scroll->sem = sem;
scroll->odm_dev = odm_dev;
scroll->task = kthread_create(scroll_thread, scroll, "tegra_scroll");
if (scroll->task == NULL) {
err = -1;
goto err_kthread_create_failed;
}
wake_up_process( scroll->task );
__set_bit(EV_KEY, input_dev->evbit);
__set_bit(KEY_ENTER, input_dev->keybit);
__set_bit(KEY_UP, input_dev->keybit);
__set_bit(KEY_DOWN, input_dev->keybit);
platform_set_drvdata(pdev, scroll);
err = input_register_device(input_dev);
if (err) {
pr_err("tegra_scroll_probe: Unable to register input device\n");
goto err_input_register_device_failed;
}
return 0;
err_input_register_device_failed:
NvOdmScrollWheelClose(scroll->odm_dev);
err_kthread_create_failed:
/* What to do? */
err_alloc_failed:
kfree(scroll);
input_free_device(input_dev);
NvOdmScrollWheelClose(odm_dev);
err_scrollWheelnotfound:
NvOdmOsSemaphoreDestroy(sem);
return err;
}
static int tegra_scroll_remove(struct platform_device *pdev)
{
struct tegra_scroll_dev *scroll = platform_get_drvdata(pdev);
/* FIXME How to destroy the thread? Maybe we should use workqueues? */
input_unregister_device(scroll->input_dev);
NvOdmScrollWheelClose(scroll->odm_dev);
NvOdmOsSemaphoreDestroy(scroll->sem);
kfree(scroll);
return 0;
}
static struct platform_driver tegra_ScrollWheel_driver = {
.probe = tegra_scroll_probe,
.remove = tegra_scroll_remove,
.driver = {
.name = "tegra_scrollwheel",
},
};
static int __devinit tegra_ScrollWheel_init(void)
{
return platform_driver_register(&tegra_ScrollWheel_driver);
}
static void __exit tegra_ScrollWheel_exit(void)
{
platform_driver_unregister(&tegra_ScrollWheel_driver);
}
module_init(tegra_ScrollWheel_init);
module_exit(tegra_ScrollWheel_exit);
MODULE_DESCRIPTION("Tegra Key board controller driver");
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