mirror of
https://github.com/torvalds/linux.git
synced 2024-11-07 20:51:47 +00:00
8eec8a1167
The power button is connected to MSIC on Medfield, we will get two interrupts from IOAPIC when pressing or releasing the power button. Signed-off-by: Hong Liu <hong.liu@intel.com> [Minor fixes as noted by Dmitry] Signed-off-by: Alan Cox <alan@linux.intel.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Matthew Garrett <mjg@redhat.com>
149 lines
3.4 KiB
C
149 lines
3.4 KiB
C
/*
|
|
* 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);
|