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/*
* Cobalt button interface driver.
*
* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
*
* 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/init.h>
#include <linux/input.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#define BUTTONS_POLL_INTERVAL 30 /* msec */
#define BUTTONS_COUNT_THRESHOLD 3
#define BUTTONS_STATUS_MASK 0xfe000000
struct buttons_dev {
struct input_dev *input;
void __iomem *reg;
};
struct buttons_map {
uint32_t mask;
int keycode;
int count;
};
static struct buttons_map buttons_map[] = {
{ 0x02000000, KEY_RESTART, },
{ 0x04000000, KEY_LEFT, },
{ 0x08000000, KEY_UP, },
{ 0x10000000, KEY_DOWN, },
{ 0x20000000, KEY_RIGHT, },
{ 0x40000000, KEY_ENTER, },
{ 0x80000000, KEY_SELECT, },
};
static struct timer_list buttons_timer;
static void handle_buttons(unsigned long data)
{
struct buttons_map *button = buttons_map;
struct buttons_dev *bdev;
uint32_t status;
int i;
bdev = (struct buttons_dev *)data;
status = readl(bdev->reg);
status = ~status & BUTTONS_STATUS_MASK;
for (i = 0; i < ARRAY_SIZE(buttons_map); i++) {
if (status & button->mask) {
button->count++;
} else {
if (button->count >= BUTTONS_COUNT_THRESHOLD) {
input_report_key(bdev->input, button->keycode, 0);
input_sync(bdev->input);
}
button->count = 0;
}
if (button->count == BUTTONS_COUNT_THRESHOLD) {
input_report_key(bdev->input, button->keycode, 1);
input_sync(bdev->input);
}
button++;
}
mod_timer(&buttons_timer, jiffies + msecs_to_jiffies(BUTTONS_POLL_INTERVAL));
}
static int cobalt_buttons_open(struct input_dev *dev)
{
mod_timer(&buttons_timer, jiffies + msecs_to_jiffies(BUTTONS_POLL_INTERVAL));
return 0;
}
static void cobalt_buttons_close(struct input_dev *dev)
{
del_timer_sync(&buttons_timer);
}
static int __devinit cobalt_buttons_probe(struct platform_device *pdev)
{
struct buttons_dev *bdev;
struct input_dev *input;
struct resource *res;
int error, i;
bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
input = input_allocate_device();
if (!bdev || !input) {
error = -ENOMEM;
goto err_free_mem;
}
input->name = "Cobalt buttons";
input->phys = "cobalt/input0";
input->id.bustype = BUS_HOST;
input->cdev.dev = &pdev->dev;
input->open = cobalt_buttons_open;
input->close = cobalt_buttons_close;
input->evbit[0] = BIT(EV_KEY);
for (i = 0; i < ARRAY_SIZE(buttons_map); i++) {
set_bit(buttons_map[i].keycode, input->keybit);
buttons_map[i].count = 0;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
error = -EBUSY;
goto err_free_mem;
}
bdev->input = input;
bdev->reg = ioremap(res->start, res->end - res->start + 1);
dev_set_drvdata(&pdev->dev, bdev);
setup_timer(&buttons_timer, handle_buttons, (unsigned long)bdev);
error = input_register_device(input);
if (error)
goto err_iounmap;
return 0;
err_iounmap:
iounmap(bdev->reg);
err_free_mem:
input_free_device(input);
kfree(bdev);
dev_set_drvdata(&pdev->dev, NULL);
return error;
}
static int __devexit cobalt_buttons_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct buttons_dev *bdev = dev_get_drvdata(dev);
input_unregister_device(bdev->input);
iounmap(bdev->reg);
kfree(bdev);
dev_set_drvdata(dev, NULL);
return 0;
}
static struct platform_driver cobalt_buttons_driver = {
.probe = cobalt_buttons_probe,
.remove = __devexit_p(cobalt_buttons_remove),
.driver = {
.name = "Cobalt buttons",
.owner = THIS_MODULE,
},
};
static int __init cobalt_buttons_init(void)
{
return platform_driver_register(&cobalt_buttons_driver);
}
static void __exit cobalt_buttons_exit(void)
{
platform_driver_unregister(&cobalt_buttons_driver);
}
module_init(cobalt_buttons_init);
module_exit(cobalt_buttons_exit);
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