3734574cac
When ONKEY is held for 3 seconds, KEY_POWER event is reported. Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/**
|
|
* max8925_onkey.c - MAX8925 ONKEY driver
|
|
*
|
|
* Copyright (C) 2009 Marvell International Ltd.
|
|
* Haojian Zhuang <haojian.zhuang@marvell.com>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file "COPYING" in the main directory of this
|
|
* archive for more details.
|
|
*
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/input.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/mfd/max8925.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define HARDRESET_EN (1 << 7)
|
|
#define PWREN_EN (1 << 7)
|
|
|
|
struct max8925_onkey_info {
|
|
struct input_dev *idev;
|
|
struct i2c_client *i2c;
|
|
int irq;
|
|
};
|
|
|
|
/*
|
|
* MAX8925 gives us an interrupt when ONKEY is held for 3 seconds.
|
|
* max8925_set_bits() operates I2C bus and may sleep. So implement
|
|
* it in thread IRQ handler.
|
|
*/
|
|
static irqreturn_t max8925_onkey_handler(int irq, void *data)
|
|
{
|
|
struct max8925_onkey_info *info = data;
|
|
|
|
input_report_key(info->idev, KEY_POWER, 1);
|
|
input_sync(info->idev);
|
|
|
|
/* Enable hardreset to halt if system isn't shutdown on time */
|
|
max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
|
|
HARDRESET_EN, HARDRESET_EN);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int __devinit max8925_onkey_probe(struct platform_device *pdev)
|
|
{
|
|
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
|
|
struct max8925_onkey_info *info;
|
|
int error;
|
|
|
|
info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
info->i2c = chip->i2c;
|
|
info->irq = chip->irq_base + MAX8925_IRQ_GPM_SW_3SEC;
|
|
|
|
info->idev = input_allocate_device();
|
|
if (!info->idev) {
|
|
dev_err(chip->dev, "Failed to allocate input dev\n");
|
|
error = -ENOMEM;
|
|
goto out_input;
|
|
}
|
|
|
|
info->idev->name = "max8925_on";
|
|
info->idev->phys = "max8925_on/input0";
|
|
info->idev->id.bustype = BUS_I2C;
|
|
info->idev->dev.parent = &pdev->dev;
|
|
info->idev->evbit[0] = BIT_MASK(EV_KEY);
|
|
info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
|
|
|
|
error = request_threaded_irq(info->irq, NULL, max8925_onkey_handler,
|
|
IRQF_ONESHOT, "onkey", info);
|
|
if (error < 0) {
|
|
dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
|
|
info->irq, error);
|
|
goto out_irq;
|
|
}
|
|
|
|
error = input_register_device(info->idev);
|
|
if (error) {
|
|
dev_err(chip->dev, "Can't register input device: %d\n", error);
|
|
goto out;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, info);
|
|
|
|
return 0;
|
|
|
|
out:
|
|
free_irq(info->irq, info);
|
|
out_irq:
|
|
input_free_device(info->idev);
|
|
out_input:
|
|
kfree(info);
|
|
return error;
|
|
}
|
|
|
|
static int __devexit max8925_onkey_remove(struct platform_device *pdev)
|
|
{
|
|
struct max8925_onkey_info *info = platform_get_drvdata(pdev);
|
|
|
|
free_irq(info->irq, info);
|
|
input_unregister_device(info->idev);
|
|
kfree(info);
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver max8925_onkey_driver = {
|
|
.driver = {
|
|
.name = "max8925-onkey",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = max8925_onkey_probe,
|
|
.remove = __devexit_p(max8925_onkey_remove),
|
|
};
|
|
|
|
static int __init max8925_onkey_init(void)
|
|
{
|
|
return platform_driver_register(&max8925_onkey_driver);
|
|
}
|
|
module_init(max8925_onkey_init);
|
|
|
|
static void __exit max8925_onkey_exit(void)
|
|
{
|
|
platform_driver_unregister(&max8925_onkey_driver);
|
|
}
|
|
module_exit(max8925_onkey_exit);
|
|
|
|
MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
|
|
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
|
|
MODULE_LICENSE("GPL");
|