149 lines
3.4 KiB
C
149 lines
3.4 KiB
C
/*
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* Driver for keys on GPIO lines capable of generating interrupts.
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*
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* Copyright 2005 Phil Blundell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/sched.h>
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#include <linux/pm.h>
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#include <linux/sysctl.h>
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#include <linux/proc_fs.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/irq.h>
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#include <asm/gpio.h>
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#include <asm/arch/hardware.h>
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#include <asm/hardware/gpio_keys.h>
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static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
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{
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int i;
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struct platform_device *pdev = dev_id;
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struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
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struct input_dev *input = platform_get_drvdata(pdev);
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for (i = 0; i < pdata->nbuttons; i++) {
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int gpio = pdata->buttons[i].gpio;
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if (irq == gpio_to_irq(gpio)) {
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int state = (gpio_get_value(gpio) ? 1 : 0) ^ (pdata->buttons[i].active_low);
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input_report_key(input, pdata->buttons[i].keycode, state);
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input_sync(input);
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}
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}
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return IRQ_HANDLED;
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}
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static int __devinit gpio_keys_probe(struct platform_device *pdev)
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{
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struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
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struct input_dev *input;
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int i, error;
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input = input_allocate_device();
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if (!input)
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return -ENOMEM;
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platform_set_drvdata(pdev, input);
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input->evbit[0] = BIT(EV_KEY);
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input->name = pdev->name;
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input->phys = "gpio-keys/input0";
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input->cdev.dev = &pdev->dev;
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input->private = pdata;
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input->id.bustype = BUS_HOST;
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input->id.vendor = 0x0001;
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input->id.product = 0x0001;
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input->id.version = 0x0100;
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for (i = 0; i < pdata->nbuttons; i++) {
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int code = pdata->buttons[i].keycode;
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int irq = gpio_to_irq(pdata->buttons[i].gpio);
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set_irq_type(irq, IRQ_TYPE_EDGE_BOTH);
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error = request_irq(irq, gpio_keys_isr, IRQF_SAMPLE_RANDOM,
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pdata->buttons[i].desc ? pdata->buttons[i].desc : "gpio_keys",
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pdev);
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if (error) {
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printk(KERN_ERR "gpio-keys: unable to claim irq %d; error %d\n",
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irq, error);
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goto fail;
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}
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set_bit(code, input->keybit);
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}
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error = input_register_device(input);
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if (error) {
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printk(KERN_ERR "Unable to register gpio-keys input device\n");
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goto fail;
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}
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return 0;
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fail:
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for (i = i - 1; i >= 0; i--)
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free_irq(gpio_to_irq(pdata->buttons[i].gpio), pdev);
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input_free_device(input);
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return error;
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}
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static int __devexit gpio_keys_remove(struct platform_device *pdev)
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{
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struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
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struct input_dev *input = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < pdata->nbuttons; i++) {
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int irq = gpio_to_irq(pdata->buttons[i].gpio);
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free_irq(irq, pdev);
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}
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input_unregister_device(input);
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return 0;
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}
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struct platform_driver gpio_keys_device_driver = {
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.probe = gpio_keys_probe,
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.remove = __devexit_p(gpio_keys_remove),
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.driver = {
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.name = "gpio-keys",
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}
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};
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static int __init gpio_keys_init(void)
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{
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return platform_driver_register(&gpio_keys_device_driver);
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}
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static void __exit gpio_keys_exit(void)
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{
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platform_driver_unregister(&gpio_keys_device_driver);
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}
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module_init(gpio_keys_init);
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module_exit(gpio_keys_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Phil Blundell <pb@handhelds.org>");
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MODULE_DESCRIPTION("Keyboard driver for CPU GPIOs");
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