intel_mid_powerbtn.c
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/*
* Power button driver for Medfield.
*
* Copyright (C) 2010 Intel Corp
*
* 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; version 2 of the License.
*
* 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/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <asm/intel_scu_ipc.h>
#define DRIVER_NAME "msic_power_btn"
#define MSIC_IRQ_STAT 0x02
#define MSIC_IRQ_PB (1 << 0)
#define MSIC_PB_CONFIG 0x3e
#define MSIC_PB_STATUS 0x3f
#define MSIC_PB_LEVEL (1 << 3) /* 1 - release, 0 - press */
struct mfld_pb_priv {
struct input_dev *input;
unsigned int irq;
};
static irqreturn_t mfld_pb_isr(int irq, void *dev_id)
{
struct mfld_pb_priv *priv = dev_id;
int ret;
u8 pbstat;
ret = intel_scu_ipc_ioread8(MSIC_PB_STATUS, &pbstat);
if (ret < 0)
return IRQ_HANDLED;
input_event(priv->input, EV_KEY, KEY_POWER, !(pbstat & MSIC_PB_LEVEL));
input_sync(priv->input);
return IRQ_HANDLED;
}
static int __devinit mfld_pb_probe(struct platform_device *pdev)
{
struct mfld_pb_priv *priv;
struct input_dev *input;
int irq;
int error;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return -EINVAL;
priv = kzalloc(sizeof(struct mfld_pb_priv), GFP_KERNEL);
input = input_allocate_device();
if (!priv || !input) {
error = -ENOMEM;
goto err_free_mem;
}
priv->input = input;
priv->irq = irq;
input->name = pdev->name;
input->phys = "power-button/input0";
input->id.bustype = BUS_HOST;
input->dev.parent = &pdev->dev;
input_set_capability(input, EV_KEY, KEY_POWER);
error = request_threaded_irq(priv->irq, NULL, mfld_pb_isr,
0, DRIVER_NAME, priv);
if (error) {
dev_err(&pdev->dev,
"unable to request irq %d for mfld power button\n",
irq);
goto err_free_mem;
}
error = input_register_device(input);
if (error) {
dev_err(&pdev->dev,
"unable to register input dev, error %d\n", error);
goto err_free_irq;
}
platform_set_drvdata(pdev, priv);
return 0;
err_free_irq:
free_irq(priv->irq, priv);
err_free_mem:
input_free_device(input);
kfree(priv);
return error;
}
static int __devexit mfld_pb_remove(struct platform_device *pdev)
{
struct mfld_pb_priv *priv = platform_get_drvdata(pdev);
free_irq(priv->irq, priv);
input_unregister_device(priv->input);
kfree(priv);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver mfld_pb_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
.probe = mfld_pb_probe,
.remove = __devexit_p(mfld_pb_remove),
};
static int __init mfld_pb_init(void)
{
return platform_driver_register(&mfld_pb_driver);
}
module_init(mfld_pb_init);
static void __exit mfld_pb_exit(void)
{
platform_driver_unregister(&mfld_pb_driver);
}
module_exit(mfld_pb_exit);
MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>");
MODULE_DESCRIPTION("Intel Medfield Power Button Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);