+++ /dev/null
-/*
- * Driver for buttons on GPIO lines not capable of generating interrupts
- *
- * Copyright (C) 2007-2010 Gabor Juhos <juhosg@openwrt.org>
- * Copyright (C) 2010 Nuno Goncalves <nunojpg@gmail.com>
- *
- * 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/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/input.h>
-#include <linux/input-polldev.h>
-#include <linux/ioport.h>
-#include <linux/platform_device.h>
-#include <linux/gpio.h>
-#include <linux/gpio_buttons.h>
-
-#define DRV_NAME "gpio-buttons"
-
-struct gpio_button_data {
- int last_state;
- int count;
- int can_sleep;
-};
-
-struct gpio_buttons_dev {
- struct input_polled_dev *poll_dev;
- struct gpio_buttons_platform_data *pdata;
- struct gpio_button_data *data;
-};
-
-static void gpio_buttons_check_state(struct input_dev *input,
- struct gpio_button *button,
- struct gpio_button_data *bdata)
-{
- int state;
-
- if (bdata->can_sleep)
- state = !!gpio_get_value_cansleep(button->gpio);
- else
- state = !!gpio_get_value(button->gpio);
-
- if (state != bdata->last_state) {
- unsigned int type = button->type ?: EV_KEY;
-
- input_event(input, type, button->code,
- !!(state ^ button->active_low));
- input_sync(input);
- bdata->count = 0;
- bdata->last_state = state;
- }
-}
-
-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];
- struct gpio_button_data *bdata = &bdev->data[i];
-
- if (bdata->count < button->threshold)
- bdata->count++;
- else
- gpio_buttons_check_state(input, button, bdata);
-
- }
-}
-
-static int gpio_buttons_probe(struct platform_device *pdev)
-{
- struct gpio_buttons_platform_data *pdata = pdev->dev.platform_data;
- struct device *dev = &pdev->dev;
- struct gpio_buttons_dev *bdev;
- struct input_polled_dev *poll_dev;
- struct input_dev *input;
- int error;
- int i;
-
- if (!pdata)
- return -ENXIO;
-
- bdev = kzalloc(sizeof(struct gpio_buttons_dev) +
- pdata->nbuttons * sizeof(struct gpio_button_data),
- GFP_KERNEL);
- if (!bdev) {
- dev_err(dev, "no memory for private data\n");
- return -ENOMEM;
- }
-
- bdev->data = (struct gpio_button_data *) &bdev[1];
-
- poll_dev = input_allocate_polled_device();
- if (!poll_dev) {
- dev_err(dev, "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(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) {
- dev_err(dev, "unable to claim gpio %u, err=%d\n",
- gpio, error);
- goto err_free_gpio;
- }
-
- error = gpio_direction_input(gpio);
- if (error) {
- dev_err(dev,
- "unable to set direction on gpio %u, err=%d\n",
- gpio, error);
- goto err_free_gpio;
- }
-
- bdev->data[i].can_sleep = gpio_cansleep(gpio);
- bdev->data[i].last_state = -1;
-
- input_set_capability(input, type, button->code);
- }
-
- bdev->poll_dev = poll_dev;
- bdev->pdata = pdata;
- platform_set_drvdata(pdev, bdev);
-
- error = input_register_polled_device(poll_dev);
- if (error) {
- dev_err(dev, "unable to register polled device, err=%d\n",
- error);
- goto err_free_gpio;
- }
-
- /* report initial state of the buttons */
- for (i = 0; i < pdata->nbuttons; i++)
- gpio_buttons_check_state(input, &pdata->buttons[i],
- &bdev->data[i]);
-
- 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);
-
- platform_set_drvdata(pdev, NULL);
- return error;
-}
-
-static int 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 = gpio_buttons_remove,
- .driver = {
- .name = DRV_NAME,
- .owner = THIS_MODULE,
- },
-};
-
-static int __init gpio_buttons_init(void)
-{
- 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 v2");
-MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
-MODULE_DESCRIPTION("Polled GPIO Buttons driver");
projects / openwrt / staging / zorun.git / commitdiff