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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 <linux/gpio_keys.h>
- #include <asm/gpio.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 == gpio_to_irq(gpio)) {
- int state = (gpio_get_value(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 = gpio_to_irq(pdata->buttons[i].gpio);
- set_irq_type(irq, IRQ_TYPE_EDGE_BOTH);
- error = request_irq(irq, gpio_keys_isr, IRQF_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, error);
- 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(gpio_to_irq(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 = gpio_to_irq(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");
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