174 lines
4.6 KiB
C
174 lines
4.6 KiB
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>
|
|
#include <linux/device.h>
|
|
|
|
#define SW_INPUT (1 << 7) /* 0/1 -- up/down */
|
|
#define HARDRESET_EN (1 << 7)
|
|
#define PWREN_EN (1 << 7)
|
|
|
|
struct max8925_onkey_info {
|
|
struct input_dev *idev;
|
|
struct i2c_client *i2c;
|
|
struct device *dev;
|
|
unsigned int irq[2];
|
|
};
|
|
|
|
/*
|
|
* MAX8925 gives us an interrupt when ONKEY is pressed or released.
|
|
* 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;
|
|
int state;
|
|
|
|
state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS);
|
|
|
|
input_report_key(info->idev, KEY_POWER, state & SW_INPUT);
|
|
input_sync(info->idev);
|
|
|
|
dev_dbg(info->dev, "onkey state:%d\n", state);
|
|
|
|
/* 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 max8925_onkey_probe(struct platform_device *pdev)
|
|
{
|
|
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
|
|
struct max8925_onkey_info *info;
|
|
struct input_dev *input;
|
|
int irq[2], error;
|
|
|
|
irq[0] = platform_get_irq(pdev, 0);
|
|
if (irq[0] < 0)
|
|
return -EINVAL;
|
|
|
|
irq[1] = platform_get_irq(pdev, 1);
|
|
if (irq[1] < 0)
|
|
return -EINVAL;
|
|
|
|
info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_onkey_info),
|
|
GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
input = devm_input_allocate_device(&pdev->dev);
|
|
if (!input)
|
|
return -ENOMEM;
|
|
|
|
info->idev = input;
|
|
info->i2c = chip->i2c;
|
|
info->dev = &pdev->dev;
|
|
info->irq[0] = irq[0];
|
|
info->irq[1] = irq[1];
|
|
|
|
input->name = "max8925_on";
|
|
input->phys = "max8925_on/input0";
|
|
input->id.bustype = BUS_I2C;
|
|
input->dev.parent = &pdev->dev;
|
|
input_set_capability(input, EV_KEY, KEY_POWER);
|
|
|
|
error = devm_request_threaded_irq(&pdev->dev, irq[0], NULL,
|
|
max8925_onkey_handler, IRQF_ONESHOT,
|
|
"onkey-down", info);
|
|
if (error < 0) {
|
|
dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
|
|
irq[0], error);
|
|
return error;
|
|
}
|
|
|
|
error = devm_request_threaded_irq(&pdev->dev, irq[1], NULL,
|
|
max8925_onkey_handler, IRQF_ONESHOT,
|
|
"onkey-up", info);
|
|
if (error < 0) {
|
|
dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
|
|
irq[1], error);
|
|
return error;
|
|
}
|
|
|
|
error = input_register_device(info->idev);
|
|
if (error) {
|
|
dev_err(chip->dev, "Can't register input device: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, info);
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused max8925_onkey_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct max8925_onkey_info *info = platform_get_drvdata(pdev);
|
|
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
|
|
|
|
if (device_may_wakeup(dev)) {
|
|
chip->wakeup_flag |= 1 << info->irq[0];
|
|
chip->wakeup_flag |= 1 << info->irq[1];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused max8925_onkey_resume(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct max8925_onkey_info *info = platform_get_drvdata(pdev);
|
|
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
|
|
|
|
if (device_may_wakeup(dev)) {
|
|
chip->wakeup_flag &= ~(1 << info->irq[0]);
|
|
chip->wakeup_flag &= ~(1 << info->irq[1]);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume);
|
|
|
|
static struct platform_driver max8925_onkey_driver = {
|
|
.driver = {
|
|
.name = "max8925-onkey",
|
|
.pm = &max8925_onkey_pm_ops,
|
|
},
|
|
.probe = max8925_onkey_probe,
|
|
};
|
|
module_platform_driver(max8925_onkey_driver);
|
|
|
|
MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
|
|
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
|
|
MODULE_LICENSE("GPL");
|