Input: gpio-keys - keyboard driver for GPIO buttons (78a56aab) · Commits · 戴 / test

drivers/input/keyboard/Kconfig

+16 −3

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		@@ -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

drivers/input/keyboard/Makefile

+3 −2

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		@@ -18,4 +18,5 @@ 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_GPIO) += gpio_keys.o

drivers/input/keyboard/gpio_keys.c

0 → 100644

+147 −0

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		/*
		* 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");

include/asm-arm/hardware/gpio_keys.h

0 → 100644

+17 −0

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		#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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