satip-axe/kernel/arch/sh/boards/mach-st/mb705-fpbutton.c
2015-03-26 17:24:57 +01:00

141 lines
3.3 KiB
C

/*
* arch/sh/boards/st/common/mb705-fpbutton.c
*
* Copyright (C) 2008 STMicroelectronics Limited
* Author: Stuart Menefy <stuart.menefy@st.com>
*
* May be copied or modified under the terms of the GNU General Public
* License. See linux/COPYING for more information.
*
* Driver for the front pannel button on the mb705 (SW12).
*
* Note that some mb705 EPLD revisions disable the ability for the
* FPButton to generate an interrupt, which renders this driver useless.
*
* Note SW8-4 on the mb705 must be on to disable propogation to the mb680
* which interprets the FP button as a reset.
*/
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/jiffies.h>
#include <linux/input.h>
#include <mach/common.h>
#include "mb705-epld.h"
#define SCAN_INTERVAL 100
static struct timer_list fpbutton_timer;
static irqreturn_t fpbutton_isr(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
struct input_dev *input = platform_get_drvdata(pdev);
input_event(input, EV_KEY, BTN_0, 1);
input_sync(input);
disable_irq(platform_get_irq(pdev, 0));
mod_timer(&fpbutton_timer, jiffies + msecs_to_jiffies(SCAN_INTERVAL));
return IRQ_HANDLED;
}
static void fpbutton_timer_callback(unsigned long data)
{
struct platform_device *pdev = (struct platform_device *)data;
struct input_dev *input = platform_get_drvdata(pdev);
int mask = platform_get_irq_byname(pdev, "mask");
u16 status = epld_read(EPLD_EMI_INT_STATUS);
if (status & mask) {
mod_timer(&fpbutton_timer,
jiffies + msecs_to_jiffies(SCAN_INTERVAL));
} else {
input_event(input, EV_KEY, BTN_0, 0);
input_sync(input);
enable_irq(platform_get_irq(pdev, 0));
}
}
static int __init mb705_fpbutton_probe(struct platform_device *pdev)
{
struct input_dev *input;
int error;
input = input_allocate_device();
if (!input)
return -ENOMEM;
platform_set_drvdata(pdev, input);
input->evbit[0] = BIT(EV_KEY);
input->name = pdev->name;
input->phys = "mb705-fpbutton/input0";
input->dev.parent = &pdev->dev;
input->id.bustype = BUS_HOST;
input->id.vendor = 0x0001;
input->id.product = 0x0001;
input->id.version = 0x0100;
input_set_capability(input, EV_KEY, BTN_0);
error = input_register_device(input);
if (error)
goto fail;
init_timer(&fpbutton_timer);
fpbutton_timer.function = fpbutton_timer_callback;
fpbutton_timer.data = (unsigned long)pdev;
error = request_irq(platform_get_irq(pdev, 0), fpbutton_isr,
IRQF_SAMPLE_RANDOM, "mb705-fpbutton", pdev);
if (error)
goto fail;
return 0;
fail:
input_free_device(input);
return error;
}
static int __exit mb705_fpbutton_remove(struct platform_device *pdev)
{
struct input_dev *input = platform_get_drvdata(pdev);
del_timer_sync(&fpbutton_timer);
free_irq(platform_get_irq(pdev, 0), pdev);
input_unregister_device(input);
return 0;
}
static struct platform_driver mb705_fpbutton_driver = {
.remove = __exit_p(mb705_fpbutton_remove),
.driver = {
.name = "mb705-fpbutton",
.owner = THIS_MODULE,
},
};
static int __init mb705_fpbutton_init(void)
{
return platform_driver_probe(&mb705_fpbutton_driver,
mb705_fpbutton_probe);
}
static void __exit mb705_fpbutton_exit(void)
{
platform_driver_unregister(&mb705_fpbutton_driver);
}
module_init(mb705_fpbutton_init);
module_exit(mb705_fpbutton_exit);