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: Paul Sokolovsky <pmiscml@gmail.com> Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Phil Blundell
Dmitry Torokhov
parent
285b0b62bc
commit
78a56aab11
@ -135,12 +135,12 @@ config KEYBOARD_STOWAWAY
|
||||
config KEYBOARD_CORGI
|
||||
tristate "Corgi keyboard"
|
||||
depends on PXA_SHARPSL
|
||||
default y
|
||||
default y
|
||||
help
|
||||
Say Y here to enable the keyboard on the Sharp Zaurus SL-C7xx
|
||||
Say Y here to enable the keyboard on the Sharp Zaurus SL-C7xx
|
||||
series of PDAs.
|
||||
|
||||
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 corgikbd.
|
||||
|
||||
config KEYBOARD_SPITZ
|
||||
@ -214,4 +214,17 @@ config KEYBOARD_AAED2000
|
||||
To compile this driver as a module, choose M here: the
|
||||
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
|
||||
|
||||
@ -16,6 +16,7 @@ obj-$(CONFIG_KEYBOARD_CORGI) += corgikbd.o
|
||||
obj-$(CONFIG_KEYBOARD_SPITZ) += spitzkbd.o
|
||||
obj-$(CONFIG_KEYBOARD_HIL) += hil_kbd.o
|
||||
obj-$(CONFIG_KEYBOARD_HIL_OLD) += hilkbd.o
|
||||
obj-$(CONFIG_KEYBOARD_OMAP) += omap-keypad.o
|
||||
obj-$(CONFIG_KEYBOARD_AAED2000) += aaed2000_kbd.o
|
||||
obj-$(CONFIG_KEYBOARD_OMAP) += omap-keypad.o
|
||||
obj-$(CONFIG_KEYBOARD_AAED2000) += aaed2000_kbd.o
|
||||
obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o
|
||||
|
||||
|
||||
147
drivers/input/keyboard/gpio_keys.c
Normal file
147
drivers/input/keyboard/gpio_keys.c
Normal file
@ -0,0 +1,147 @@
|
||||
/*
|
||||
* 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");
|
||||
17
include/asm-arm/hardware/gpio_keys.h
Normal file
17
include/asm-arm/hardware/gpio_keys.h
Normal file
@ -0,0 +1,17 @@
|
||||
#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
|
||||
Loading…
Reference in New Issue
Block a user