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add a polled GPIO buttons input driver 

SVN-Revision: 10766
This commit is contained in:
Gabor Juhos 2008-04-07 19:54:44 +00:00
parent 9d6946765a
commit 5798590c7c
6 changed files with 365 additions and 0 deletions
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34
package/kernel/modules/other.mk
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@ -497,6 +497,40 @@ endef
$(eval $(call KernelPackage,input-evdev))
define KernelPackage/input-polldev
SUBMENU:=$(OTHER_MENU)
TITLE:=Polled Input device support
DEPENDS:=+kmod-input-core @LINUX_2_6
KCONFIG:=CONFIG_INPUT_POLLDEV
FILES:=$(LINUX_DIR)/drivers/input/input-polldev.$(LINUX_KMOD_SUFFIX)
AUTOLOAD:=$(call AutoLoad,61,input-polldev)
endef
define KernelPackage/input-polldev/description
Kernel module for support of polled input devices
endef
$(eval $(call KernelPackage,input-polldev))
define KernelPackage/input-gpio-buttons
SUBMENU:=$(OTHER_MENU)
TITLE:=Polled GPIO buttons input device
DEPENDS:=+kmod-input-polldev @LINUX_2_6
KCONFIG:= \
CONFIG_INPUT_GPIO_BUTTONS \
CONFIG_INPUT_MISC=y
FILES:=$(LINUX_DIR)/drivers/input/misc/gpio_buttons.$(LINUX_KMOD_SUFFIX)
AUTOLOAD:=$(call AutoLoad,62,gpio_buttons)
endef
define KernelPackage/input-gpio-buttons/description
Kernel module for support polled GPIO buttons input device
endef
$(eval $(call KernelPackage,input-gpio-buttons))
define KernelPackage/mmc-spi
SUBMENU:=$(OTHER_MENU)
TITLE:=MMC/SD over SPI Support

206
target/linux/generic-2.6/files/drivers/input/misc/gpio_buttons.c Normal file
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@ -0,0 +1,206 @@
/*
* Driver for buttons on GPIO lines not capable of generating interrupts
*
* Copyright (C) 2007,2008 Gabor Juhos <juhosg at openwrt.org>
*
* This file was based on: /drivers/input/misc/cobalt_btns.c
* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
*
* also was based on: /drivers/input/keyboard/gpio_keys.c
* 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/init.h>
#include <linux/input-polldev.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/gpio_buttons.h>
#include <asm/gpio.h>
#define DRV_NAME "gpio-buttons"
#define DRV_VERSION "0.1.0"
#define PFX DRV_NAME ": "
struct gpio_buttons_dev {
struct input_polled_dev *poll_dev;
struct gpio_buttons_platform_data *pdata;
};
static void gpio_buttons_poll(struct input_polled_dev *dev)
{
struct gpio_buttons_dev *bdev = dev->private;
struct gpio_buttons_platform_data *pdata = bdev->pdata;
struct input_dev *input = dev->input;
int i;
for (i = 0; i < bdev->pdata->nbuttons; i++) {
struct gpio_button *button = &pdata->buttons[i];
unsigned int type = button->type ?: EV_KEY;
int state;
state = gpio_get_value(button->gpio) ? 1 : 0;
state ^= button->active_low;
if (state) {
button->count++;
} else {
if (button->count >= button->threshold) {
input_event(input, type, button->code, 1);
input_sync(input);
}
button->count = 0;
}
if (button->count == button->threshold) {
input_event(input, type, button->code, 0);
input_sync(input);
}
}
}
static int __devinit gpio_buttons_probe(struct platform_device *pdev)
{
struct gpio_buttons_platform_data *pdata = pdev->dev.platform_data;
struct gpio_buttons_dev *bdev;
struct input_polled_dev *poll_dev;
struct input_dev *input;
int error, i;
if (!pdata)
return -ENXIO;
bdev = kzalloc(sizeof(*bdev), GFP_KERNEL);
if (!bdev) {
pr_err(DRV_NAME "no memory for device\n");
return -ENOMEM;
}
poll_dev = input_allocate_polled_device();
if (!poll_dev) {
pr_err(DRV_NAME "no memory for polled device\n");
error = -ENOMEM;
goto err_free_bdev;
}
poll_dev->private = bdev;
poll_dev->poll = gpio_buttons_poll;
poll_dev->poll_interval = pdata->poll_interval;
input = poll_dev->input;
input->evbit[0] = BIT_MASK(EV_KEY);
input->name = pdev->name;
input->phys = "gpio-buttons/input0";
input->dev.parent = &pdev->dev;
input->id.bustype = BUS_HOST;
input->id.vendor = 0x0001;
input->id.product = 0x0001;
input->id.version = 0x0100;
for (i = 0; i < pdata->nbuttons; i++) {
struct gpio_button *button = &pdata->buttons[i];
unsigned int gpio = button->gpio;
unsigned int type = button->type ?: EV_KEY;
error = gpio_request(gpio, button->desc ?
button->desc : DRV_NAME);
if (error) {
pr_err(PFX "unable to claim gpio %u, error %d\n",
gpio, error);
goto err_free_gpio;
}
error = gpio_direction_input(gpio);
if (error) {
pr_err(PFX "unable to set direction on gpio %u, "
"error %d\n", gpio, error);
goto err_free_gpio;
}
input_set_capability(input, type, button->code);
button->count = 0;
}
bdev->poll_dev = poll_dev;
bdev->pdata = pdata;
platform_set_drvdata(pdev, bdev);
error = input_register_polled_device(poll_dev);
if (error) {
pr_err(PFX "unable to register polled device, error %d\n",
error);
goto err_free_gpio;
}
return 0;
err_free_gpio:
for (i = i - 1; i >= 0; i--)
gpio_free(pdata->buttons[i].gpio);
input_free_polled_device(poll_dev);
err_free_bdev:
kfree(bdev);
err:
platform_set_drvdata(pdev, NULL);
return error;
}
static int __devexit gpio_buttons_remove(struct platform_device *pdev)
{
struct gpio_buttons_dev *bdev = platform_get_drvdata(pdev);
struct gpio_buttons_platform_data *pdata = bdev->pdata;
int i;
input_unregister_polled_device(bdev->poll_dev);
for (i = 0; i < pdata->nbuttons; i++)
gpio_free(pdata->buttons[i].gpio);
input_free_polled_device(bdev->poll_dev);
kfree(bdev);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver gpio_buttons_driver = {
.probe = gpio_buttons_probe,
.remove = __devexit_p(gpio_buttons_remove),
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
};
static int __init gpio_buttons_init(void)
{
pr_info(DRV_NAME " driver version " DRV_VERSION "\n");
return platform_driver_register(&gpio_buttons_driver);
}
static void __exit gpio_buttons_exit(void)
{
platform_driver_unregister(&gpio_buttons_driver);
}
module_init(gpio_buttons_init);
module_exit(gpio_buttons_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("Polled buttons driver for CPU GPIOs");

35
target/linux/generic-2.6/files/include/linux/gpio_buttons.h Normal file
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@ -0,0 +1,35 @@
/*
* Definitions for the GPIO buttons interface driver
*
* Copyright (C) 2007,2008 Gabor Juhos <juhosg at openwrt.org>
*
* This file was based on: /include/linux/gpio_keys.h
* The original gpio_keys.h seems not to have a license.
*
* 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.
*
*/
#ifndef _GPIO_BUTTONS_H_
#define _GPIO_BUTTONS_H_
struct gpio_button {
int gpio; /* GPIO line number */
int active_low;
char *desc; /* button description */
int type; /* input event type (EV_KEY, EV_SW) */
int code; /* input event code (KEY_*, SW_*) */
int count;
int threshold; /* count threshold */
};
struct gpio_buttons_platform_data {
struct gpio_button *buttons;
int nbuttons; /* number of buttons */
int poll_interval; /* polling interval */
};
#endif /* _GPIO_BUTTONS_H_ */

30
target/linux/generic-2.6/patches-2.6.22/410-gpio_buttons.patch Normal file
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@ -0,0 +1,30 @@
--- linux-2.6.22.orig/drivers/input/misc/Kconfig 2007-08-21 06:33:06.000000000 +0200
+++ linux-2.6.22/drivers/input/misc/Kconfig 2007-10-08 10:57:23.000000000 +0200
@@ -178,4 +178,20 @@
Say Y here if you want to support the built-in real time clock
of the HP SDC controller.
+config INPUT_GPIO_BUTTONS
+ tristate "Polled GPIO buttons interface"
+ depends on GENERIC_GPIO
+ select INPUT_POLLDEV
+ help
+ This driver implements support for buttons connected
+ to GPIO pins of various CPUs (and some other chips).
+
+ Say Y here if your device has buttons connected
+ directly to such GPIO pins. Your board-specific
+ setup logic must also provide a platform device,
+ with configuration data saying which GPIOs are used.
+
+ To compile this driver as a module, choose M here: the
+ module will be called gpio-buttons.
+
endif
--- linux-2.6.22.4.orig/drivers/input/misc/Makefile 2007-08-21 06:33:06.000000000 +0200
+++ linux-2.6.22.4/drivers/input/misc/Makefile 2007-10-08 10:50:12.000000000 +0200
@@ -18,3 +18,4 @@
obj-$(CONFIG_INPUT_YEALINK) += yealink.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
obj-$(CONFIG_INPUT_UINPUT) += uinput.o
+obj-$(CONFIG_INPUT_GPIO_BUTTONS) += gpio_buttons.o

30
target/linux/generic-2.6/patches-2.6.23/410-gpio_buttons.patch Normal file
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@ -0,0 +1,30 @@
--- linux-2.6.23.orig/drivers/input/misc/Kconfig 2007-08-21 06:33:06.000000000 +0200
+++ linux-2.6.23/drivers/input/misc/Kconfig 2007-10-08 10:57:23.000000000 +0200
@@ -178,4 +178,20 @@
Say Y here if you want to support the built-in real time clock
of the HP SDC controller.
+config INPUT_GPIO_BUTTONS
+ tristate "Polled GPIO buttons interface"
+ depends on GENERIC_GPIO
+ select INPUT_POLLDEV
+ help
+ This driver implements support for buttons connected
+ to GPIO pins of various CPUs (and some other chips).
+
+ Say Y here if your device has buttons connected
+ directly to such GPIO pins. Your board-specific
+ setup logic must also provide a platform device,
+ with configuration data saying which GPIOs are used.
+
+ To compile this driver as a module, choose M here: the
+ module will be called gpio-buttons.
+
endif
--- linux-2.6.23.orig/drivers/input/misc/Makefile 2007-08-21 06:33:06.000000000 +0200
+++ linux-2.6.23/drivers/input/misc/Makefile 2007-10-08 10:50:12.000000000 +0200
@@ -18,3 +18,4 @@
obj-$(CONFIG_INPUT_YEALINK) += yealink.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
obj-$(CONFIG_INPUT_UINPUT) += uinput.o
+obj-$(CONFIG_INPUT_GPIO_BUTTONS) += gpio_buttons.o

30
target/linux/generic-2.6/patches-2.6.24/410-gpio_buttons.patch Normal file
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@ -0,0 +1,30 @@
--- linux-2.6.24.2.orig/drivers/input/misc/Kconfig 2007-08-21 06:33:06.000000000 +0200
+++ linux-2.6.24.2/drivers/input/misc/Kconfig 2007-10-08 10:57:23.000000000 +0200
@@ -178,4 +178,20 @@
Say Y here if you want to support the built-in real time clock
of the HP SDC controller.
+config INPUT_GPIO_BUTTONS
+ tristate "Polled GPIO buttons interface"
+ depends on GENERIC_GPIO
+ select INPUT_POLLDEV
+ help
+ This driver implements support for buttons connected
+ to GPIO pins of various CPUs (and some other chips).
+
+ Say Y here if your device has buttons connected
+ directly to such GPIO pins. Your board-specific
+ setup logic must also provide a platform device,
+ with configuration data saying which GPIOs are used.
+
+ To compile this driver as a module, choose M here: the
+ module will be called gpio-buttons.
+
endif
--- linux-2.6.24.2.orig/drivers/input/misc/Makefile 2007-08-21 06:33:06.000000000 +0200
+++ linux-2.6.24.2/drivers/input/misc/Makefile 2007-10-08 10:50:12.000000000 +0200
@@ -18,3 +18,4 @@
obj-$(CONFIG_INPUT_YEALINK) += yealink.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
obj-$(CONFIG_INPUT_UINPUT) += uinput.o
+obj-$(CONFIG_INPUT_GPIO_BUTTONS) += gpio_buttons.o