88pm80x_onkey.c
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/*
* Marvell 88PM80x ONKEY driver
*
* Copyright (C) 2012 Marvell International Ltd.
* Haojian Zhuang <haojian.zhuang@marvell.com>
* Qiao Zhou <zhouqiao@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/input.h>
#include <linux/mfd/88pm80x.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define PM800_LONG_ONKEY_EN (1 << 0)
#define PM800_LONG_KEY_DELAY (8) /* 1 .. 16 seconds */
#define PM800_LONKEY_PRESS_TIME ((PM800_LONG_KEY_DELAY-1) << 4)
#define PM800_LONKEY_PRESS_TIME_MASK (0xF0)
#define PM800_SW_PDOWN (1 << 5)
struct pm80x_onkey_info {
struct input_dev *idev;
struct pm80x_chip *pm80x;
struct regmap *map;
int irq;
};
/* 88PM80x gives us an interrupt when ONKEY is held */
static irqreturn_t pm80x_onkey_handler(int irq, void *data)
{
struct pm80x_onkey_info *info = data;
int ret = 0;
unsigned int val;
ret = regmap_read(info->map, PM800_STATUS_1, &val);
if (ret < 0) {
dev_err(info->idev->dev.parent, "failed to read status: %d\n", ret);
return IRQ_NONE;
}
val &= PM800_ONKEY_STS1;
input_report_key(info->idev, KEY_POWER, val);
input_sync(info->idev);
return IRQ_HANDLED;
}
static SIMPLE_DEV_PM_OPS(pm80x_onkey_pm_ops, pm80x_dev_suspend,
pm80x_dev_resume);
static int pm80x_onkey_probe(struct platform_device *pdev)
{
struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct pm80x_onkey_info *info;
int err;
info = kzalloc(sizeof(struct pm80x_onkey_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->pm80x = chip;
info->irq = platform_get_irq(pdev, 0);
if (info->irq < 0) {
dev_err(&pdev->dev, "No IRQ resource!\n");
err = -EINVAL;
goto out;
}
info->map = info->pm80x->regmap;
if (!info->map) {
dev_err(&pdev->dev, "no regmap!\n");
err = -EINVAL;
goto out;
}
info->idev = input_allocate_device();
if (!info->idev) {
dev_err(&pdev->dev, "Failed to allocate input dev\n");
err = -ENOMEM;
goto out;
}
info->idev->name = "88pm80x_on";
info->idev->phys = "88pm80x_on/input0";
info->idev->id.bustype = BUS_I2C;
info->idev->dev.parent = &pdev->dev;
info->idev->evbit[0] = BIT_MASK(EV_KEY);
__set_bit(KEY_POWER, info->idev->keybit);
err = pm80x_request_irq(info->pm80x, info->irq, pm80x_onkey_handler,
IRQF_ONESHOT, "onkey", info);
if (err < 0) {
dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n",
info->irq, err);
goto out_reg;
}
err = input_register_device(info->idev);
if (err) {
dev_err(&pdev->dev, "Can't register input device: %d\n", err);
goto out_irq;
}
platform_set_drvdata(pdev, info);
/* Enable long onkey detection */
regmap_update_bits(info->map, PM800_RTC_MISC4, PM800_LONG_ONKEY_EN,
PM800_LONG_ONKEY_EN);
/* Set 8-second interval */
regmap_update_bits(info->map, PM800_RTC_MISC3,
PM800_LONKEY_PRESS_TIME_MASK,
PM800_LONKEY_PRESS_TIME);
device_init_wakeup(&pdev->dev, 1);
return 0;
out_irq:
pm80x_free_irq(info->pm80x, info->irq, info);
out_reg:
input_free_device(info->idev);
out:
kfree(info);
return err;
}
static int pm80x_onkey_remove(struct platform_device *pdev)
{
struct pm80x_onkey_info *info = platform_get_drvdata(pdev);
device_init_wakeup(&pdev->dev, 0);
pm80x_free_irq(info->pm80x, info->irq, info);
input_unregister_device(info->idev);
kfree(info);
return 0;
}
static struct platform_driver pm80x_onkey_driver = {
.driver = {
.name = "88pm80x-onkey",
.pm = &pm80x_onkey_pm_ops,
},
.probe = pm80x_onkey_probe,
.remove = pm80x_onkey_remove,
};
module_platform_driver(pm80x_onkey_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver");
MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
MODULE_ALIAS("platform:88pm80x-onkey");