163 строки
4.2 KiB
C
163 строки
4.2 KiB
C
/*
|
|
* Cobalt button interface driver.
|
|
*
|
|
* Copyright (C) 2007-2008 Yoichi Yuasa <yuasa@linux-mips.org>
|
|
*
|
|
* 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-polldev.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define BUTTONS_POLL_INTERVAL 30 /* msec */
|
|
#define BUTTONS_COUNT_THRESHOLD 3
|
|
#define BUTTONS_STATUS_MASK 0xfe000000
|
|
|
|
static const unsigned short cobalt_map[] = {
|
|
KEY_RESERVED,
|
|
KEY_RESTART,
|
|
KEY_LEFT,
|
|
KEY_UP,
|
|
KEY_DOWN,
|
|
KEY_RIGHT,
|
|
KEY_ENTER,
|
|
KEY_SELECT
|
|
};
|
|
|
|
struct buttons_dev {
|
|
struct input_polled_dev *poll_dev;
|
|
unsigned short keymap[ARRAY_SIZE(cobalt_map)];
|
|
int count[ARRAY_SIZE(cobalt_map)];
|
|
void __iomem *reg;
|
|
};
|
|
|
|
static void handle_buttons(struct input_polled_dev *dev)
|
|
{
|
|
struct buttons_dev *bdev = dev->private;
|
|
struct input_dev *input = dev->input;
|
|
uint32_t status;
|
|
int i;
|
|
|
|
status = ~readl(bdev->reg) >> 24;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
|
|
if (status & (1U << i)) {
|
|
if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
|
|
input_event(input, EV_MSC, MSC_SCAN, i);
|
|
input_report_key(input, bdev->keymap[i], 1);
|
|
input_sync(input);
|
|
}
|
|
} else {
|
|
if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
|
|
input_event(input, EV_MSC, MSC_SCAN, i);
|
|
input_report_key(input, bdev->keymap[i], 0);
|
|
input_sync(input);
|
|
}
|
|
bdev->count[i] = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int cobalt_buttons_probe(struct platform_device *pdev)
|
|
{
|
|
struct buttons_dev *bdev;
|
|
struct input_polled_dev *poll_dev;
|
|
struct input_dev *input;
|
|
struct resource *res;
|
|
int error, i;
|
|
|
|
bdev = kzalloc(sizeof(struct buttons_dev), GFP_KERNEL);
|
|
poll_dev = input_allocate_polled_device();
|
|
if (!bdev || !poll_dev) {
|
|
error = -ENOMEM;
|
|
goto err_free_mem;
|
|
}
|
|
|
|
memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap));
|
|
|
|
poll_dev->private = bdev;
|
|
poll_dev->poll = handle_buttons;
|
|
poll_dev->poll_interval = BUTTONS_POLL_INTERVAL;
|
|
|
|
input = poll_dev->input;
|
|
input->name = "Cobalt buttons";
|
|
input->phys = "cobalt/input0";
|
|
input->id.bustype = BUS_HOST;
|
|
input->dev.parent = &pdev->dev;
|
|
|
|
input->keycode = bdev->keymap;
|
|
input->keycodemax = ARRAY_SIZE(bdev->keymap);
|
|
input->keycodesize = sizeof(unsigned short);
|
|
|
|
input_set_capability(input, EV_MSC, MSC_SCAN);
|
|
__set_bit(EV_KEY, input->evbit);
|
|
for (i = 0; i < ARRAY_SIZE(cobalt_map); i++)
|
|
__set_bit(bdev->keymap[i], input->keybit);
|
|
__clear_bit(KEY_RESERVED, input->keybit);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
error = -EBUSY;
|
|
goto err_free_mem;
|
|
}
|
|
|
|
bdev->poll_dev = poll_dev;
|
|
bdev->reg = ioremap(res->start, resource_size(res));
|
|
dev_set_drvdata(&pdev->dev, bdev);
|
|
|
|
error = input_register_polled_device(poll_dev);
|
|
if (error)
|
|
goto err_iounmap;
|
|
|
|
return 0;
|
|
|
|
err_iounmap:
|
|
iounmap(bdev->reg);
|
|
err_free_mem:
|
|
input_free_polled_device(poll_dev);
|
|
kfree(bdev);
|
|
return error;
|
|
}
|
|
|
|
static int cobalt_buttons_remove(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct buttons_dev *bdev = dev_get_drvdata(dev);
|
|
|
|
input_unregister_polled_device(bdev->poll_dev);
|
|
input_free_polled_device(bdev->poll_dev);
|
|
iounmap(bdev->reg);
|
|
kfree(bdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
|
|
MODULE_DESCRIPTION("Cobalt button interface driver");
|
|
MODULE_LICENSE("GPL");
|
|
/* work with hotplug and coldplug */
|
|
MODULE_ALIAS("platform:Cobalt buttons");
|
|
|
|
static struct platform_driver cobalt_buttons_driver = {
|
|
.probe = cobalt_buttons_probe,
|
|
.remove = cobalt_buttons_remove,
|
|
.driver = {
|
|
.name = "Cobalt buttons",
|
|
},
|
|
};
|
|
module_platform_driver(cobalt_buttons_driver);
|