Commit 78a56aab authored by Phil Blundell's avatar Phil Blundell Committed by Dmitry Torokhov

Input: gpio-keys - keyboard driver for GPIO buttons

This is an interrupt-driven keyboard driver for simple buttons
connected directly to CPU GPIO lines of embedded ARM systems.
It supports pxa architectures and is used by a number of PDAs
and PocketPC phones in the handhelds.org kernel. Support for
other architectures, such as sa11xx and sc2410, will be added
once generic GPIO API is available.
Signed-off-by: default avatarPaul Sokolovsky <pmiscml@gmail.com>
Signed-off-by: default avatarPhilipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 285b0b62
...@@ -214,4 +214,17 @@ config KEYBOARD_AAED2000 ...@@ -214,4 +214,17 @@ config KEYBOARD_AAED2000
To compile this driver as a module, choose M here: the To compile this driver as a module, choose M here: the
module will be called aaed2000_kbd. module will be called aaed2000_kbd.
config KEYBOARD_GPIO
tristate "Buttons on CPU GPIOs (PXA)"
depends on ARCH_PXA
help
This driver implements support for buttons connected
directly to GPIO pins of PXA CPUs.
Say Y here if your device has buttons connected
directly to GPIO pins of the CPU.
To compile this driver as a module, choose M here: the
module will be called gpio-keys.
endif endif
...@@ -18,4 +18,5 @@ obj-$(CONFIG_KEYBOARD_HIL) += hil_kbd.o ...@@ -18,4 +18,5 @@ obj-$(CONFIG_KEYBOARD_HIL) += hil_kbd.o
obj-$(CONFIG_KEYBOARD_HIL_OLD) += hilkbd.o obj-$(CONFIG_KEYBOARD_HIL_OLD) += hilkbd.o
obj-$(CONFIG_KEYBOARD_OMAP) += omap-keypad.o obj-$(CONFIG_KEYBOARD_OMAP) += omap-keypad.o
obj-$(CONFIG_KEYBOARD_AAED2000) += aaed2000_kbd.o obj-$(CONFIG_KEYBOARD_AAED2000) += aaed2000_kbd.o
obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o
/*
* Driver for keys on GPIO lines capable of generating interrupts.
*
* Copyright 2005 Phil Blundell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/version.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/irq.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/hardware.h>
#include <asm/hardware/gpio_keys.h>
static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
{
int i;
struct platform_device *pdev = dev_id;
struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
struct input_dev *input = platform_get_drvdata(pdev);
for (i = 0; i < pdata->nbuttons; i++) {
int gpio = pdata->buttons[i].gpio;
if (irq == IRQ_GPIO(gpio)) {
int state = ((GPLR(gpio) & GPIO_bit(gpio)) ? 1 : 0) ^ (pdata->buttons[i].active_low);
input_report_key(input, pdata->buttons[i].keycode, state);
input_sync(input);
}
}
return IRQ_HANDLED;
}
static int __devinit gpio_keys_probe(struct platform_device *pdev)
{
struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
struct input_dev *input;
int i, 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 = "gpio-keys/input0";
input->cdev.dev = &pdev->dev;
input->private = pdata;
input->id.bustype = BUS_HOST;
input->id.vendor = 0x0001;
input->id.product = 0x0001;
input->id.version = 0x0100;
for (i = 0; i < pdata->nbuttons; i++) {
int code = pdata->buttons[i].keycode;
int irq = IRQ_GPIO(pdata->buttons[i].gpio);
set_irq_type(irq, IRQ_TYPE_EDGE_BOTH);
error = request_irq(irq, gpio_keys_isr, SA_SAMPLE_RANDOM,
pdata->buttons[i].desc ? pdata->buttons[i].desc : "gpio_keys",
pdev);
if (error) {
printk(KERN_ERR "gpio-keys: unable to claim irq %d; error %d\n", irq, ret);
goto fail;
}
set_bit(code, input->keybit);
}
error = input_register_device(input);
if (error) {
printk(KERN_ERR "Unable to register gpio-keys input device\n");
goto fail;
}
return 0;
fail:
for (i = i - 1; i >= 0; i--)
free_irq(IRQ_GPIO(pdata->buttons[i].gpio), pdev);
input_free_device(input);
return error;
}
static int __devexit gpio_keys_remove(struct platform_device *pdev)
{
struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
struct input_dev *input = platform_get_drvdata(pdev);
int i;
for (i = 0; i < pdata->nbuttons; i++) {
int irq = IRQ_GPIO(pdata->buttons[i].gpio);
free_irq(irq, pdev);
}
input_unregister_device(input);
return 0;
}
struct platform_driver gpio_keys_device_driver = {
.probe = gpio_keys_probe,
.remove = __devexit_p(gpio_keys_remove),
.driver = {
.name = "gpio-keys",
}
};
static int __init gpio_keys_init(void)
{
return platform_driver_register(&gpio_keys_device_driver);
}
static void __exit gpio_keys_exit(void)
{
platform_driver_unregister(&gpio_keys_device_driver);
}
module_init(gpio_keys_init);
module_exit(gpio_keys_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
MODULE_DESCRIPTION("Keyboard driver for CPU GPIOs");
#ifndef _GPIO_KEYS_H
#define _GPIO_KEYS_H
struct gpio_keys_button {
/* Configuration parameters */
int keycode;
int gpio;
int active_low;
char *desc;
};
struct gpio_keys_platform_data {
struct gpio_keys_button *buttons;
int nbuttons;
};
#endif
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