287 lines
6.8 KiB
C
287 lines
6.8 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/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/gpio_keys.h>
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#include <linux/workqueue.h>
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#include <asm/gpio.h>
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struct gpio_button_data {
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struct gpio_keys_button *button;
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struct input_dev *input;
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struct timer_list timer;
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struct work_struct work;
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};
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struct gpio_keys_drvdata {
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struct input_dev *input;
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struct gpio_button_data data[0];
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};
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static void gpio_keys_report_event(struct work_struct *work)
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{
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struct gpio_button_data *bdata =
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container_of(work, struct gpio_button_data, work);
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struct gpio_keys_button *button = bdata->button;
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struct input_dev *input = bdata->input;
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unsigned int type = button->type ?: EV_KEY;
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int state = (gpio_get_value(button->gpio) ? 1 : 0) ^ button->active_low;
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input_event(input, type, button->code, !!state);
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input_sync(input);
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}
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static void gpio_keys_timer(unsigned long _data)
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{
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struct gpio_button_data *data = (struct gpio_button_data *)_data;
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schedule_work(&data->work);
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}
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static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
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{
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struct gpio_button_data *bdata = dev_id;
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struct gpio_keys_button *button = bdata->button;
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BUG_ON(irq != gpio_to_irq(button->gpio));
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if (button->debounce_interval)
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mod_timer(&bdata->timer,
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jiffies + msecs_to_jiffies(button->debounce_interval));
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else
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schedule_work(&bdata->work);
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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 gpio_keys_drvdata *ddata;
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struct input_dev *input;
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int i, error;
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int wakeup = 0;
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ddata = kzalloc(sizeof(struct gpio_keys_drvdata) +
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pdata->nbuttons * sizeof(struct gpio_button_data),
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GFP_KERNEL);
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input = input_allocate_device();
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if (!ddata || !input) {
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error = -ENOMEM;
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goto fail1;
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}
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platform_set_drvdata(pdev, ddata);
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input->name = pdev->name;
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input->phys = "gpio-keys/input0";
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input->dev.parent = &pdev->dev;
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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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/* Enable auto repeat feature of Linux input subsystem */
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if (pdata->rep)
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__set_bit(EV_REP, input->evbit);
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ddata->input = input;
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for (i = 0; i < pdata->nbuttons; i++) {
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struct gpio_keys_button *button = &pdata->buttons[i];
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struct gpio_button_data *bdata = &ddata->data[i];
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int irq;
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unsigned int type = button->type ?: EV_KEY;
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bdata->input = input;
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bdata->button = button;
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setup_timer(&bdata->timer,
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gpio_keys_timer, (unsigned long)bdata);
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INIT_WORK(&bdata->work, gpio_keys_report_event);
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error = gpio_request(button->gpio, button->desc ?: "gpio_keys");
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if (error < 0) {
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pr_err("gpio-keys: failed to request GPIO %d,"
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" error %d\n", button->gpio, error);
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goto fail2;
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}
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error = gpio_direction_input(button->gpio);
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if (error < 0) {
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pr_err("gpio-keys: failed to configure input"
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" direction for GPIO %d, error %d\n",
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button->gpio, error);
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gpio_free(button->gpio);
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goto fail2;
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}
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irq = gpio_to_irq(button->gpio);
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if (irq < 0) {
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error = irq;
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pr_err("gpio-keys: Unable to get irq number"
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" for GPIO %d, error %d\n",
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button->gpio, error);
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gpio_free(button->gpio);
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goto fail2;
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}
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error = request_irq(irq, gpio_keys_isr,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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button->desc ? button->desc : "gpio_keys",
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bdata);
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if (error) {
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pr_err("gpio-keys: Unable to claim irq %d; error %d\n",
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irq, error);
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gpio_free(button->gpio);
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goto fail2;
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}
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if (button->wakeup)
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wakeup = 1;
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input_set_capability(input, type, button->code);
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}
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error = input_register_device(input);
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if (error) {
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pr_err("gpio-keys: Unable to register input device, "
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"error: %d\n", error);
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goto fail2;
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}
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device_init_wakeup(&pdev->dev, wakeup);
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return 0;
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fail2:
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while (--i >= 0) {
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free_irq(gpio_to_irq(pdata->buttons[i].gpio), &ddata->data[i]);
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if (pdata->buttons[i].debounce_interval)
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del_timer_sync(&ddata->data[i].timer);
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cancel_work_sync(&ddata->data[i].work);
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gpio_free(pdata->buttons[i].gpio);
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}
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platform_set_drvdata(pdev, NULL);
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fail1:
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input_free_device(input);
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kfree(ddata);
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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 gpio_keys_drvdata *ddata = platform_get_drvdata(pdev);
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struct input_dev *input = ddata->input;
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int i;
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device_init_wakeup(&pdev->dev, 0);
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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, &ddata->data[i]);
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if (pdata->buttons[i].debounce_interval)
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del_timer_sync(&ddata->data[i].timer);
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cancel_work_sync(&ddata->data[i].work);
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gpio_free(pdata->buttons[i].gpio);
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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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#ifdef CONFIG_PM
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static int gpio_keys_suspend(struct platform_device *pdev, pm_message_t state)
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{
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struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
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int i;
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if (device_may_wakeup(&pdev->dev)) {
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for (i = 0; i < pdata->nbuttons; i++) {
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struct gpio_keys_button *button = &pdata->buttons[i];
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if (button->wakeup) {
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int irq = gpio_to_irq(button->gpio);
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enable_irq_wake(irq);
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}
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}
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}
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return 0;
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}
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static int gpio_keys_resume(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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int i;
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if (device_may_wakeup(&pdev->dev)) {
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for (i = 0; i < pdata->nbuttons; i++) {
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struct gpio_keys_button *button = &pdata->buttons[i];
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if (button->wakeup) {
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int irq = gpio_to_irq(button->gpio);
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disable_irq_wake(irq);
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}
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}
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}
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return 0;
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}
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#else
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#define gpio_keys_suspend NULL
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#define gpio_keys_resume NULL
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#endif
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static 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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.suspend = gpio_keys_suspend,
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.resume = gpio_keys_resume,
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.driver = {
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.name = "gpio-keys",
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.owner = THIS_MODULE,
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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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MODULE_ALIAS("platform:gpio-keys");
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