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/*
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* Driver for buttons on GPIO lines not capable of generating interrupts |
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* |
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* Copyright (C) 2007,2008 Gabor Juhos <juhosg at openwrt.org> |
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* |
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* This file was based on: /drivers/input/misc/cobalt_btns.c |
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* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> |
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* |
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* also was based on: /drivers/input/keyboard/gpio_keys.c |
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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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*/ |
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#include <linux/init.h> |
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#include <linux/input-polldev.h> |
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#include <linux/ioport.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/gpio_buttons.h> |
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#include <asm/gpio.h> |
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#define DRV_NAME "gpio-buttons" |
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#define DRV_VERSION "0.1.0" |
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#define PFX DRV_NAME ": " |
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struct gpio_buttons_dev { |
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struct input_polled_dev *poll_dev; |
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struct gpio_buttons_platform_data *pdata; |
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}; |
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static void gpio_buttons_poll(struct input_polled_dev *dev) |
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{ |
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struct gpio_buttons_dev *bdev = dev->private; |
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struct gpio_buttons_platform_data *pdata = bdev->pdata; |
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struct input_dev *input = dev->input; |
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int i; |
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for (i = 0; i < bdev->pdata->nbuttons; i++) { |
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struct gpio_button *button = &pdata->buttons[i]; |
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unsigned int type = button->type ?: EV_KEY; |
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int state; |
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state = gpio_get_value(button->gpio) ? 1 : 0; |
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state ^= button->active_low; |
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if (state) { |
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button->count++; |
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} else { |
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if (button->count >= button->threshold) { |
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input_event(input, type, button->code, 1); |
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input_sync(input); |
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} |
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button->count = 0; |
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} |
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if (button->count == button->threshold) { |
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input_event(input, type, button->code, 0); |
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input_sync(input); |
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} |
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} |
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} |
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static int __devinit gpio_buttons_probe(struct platform_device *pdev) |
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{ |
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struct gpio_buttons_platform_data *pdata = pdev->dev.platform_data; |
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struct gpio_buttons_dev *bdev; |
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struct input_polled_dev *poll_dev; |
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struct input_dev *input; |
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int error, i; |
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if (!pdata) |
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return -ENXIO; |
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bdev = kzalloc(sizeof(*bdev), GFP_KERNEL); |
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if (!bdev) { |
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pr_err(DRV_NAME "no memory for device\n"); |
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return -ENOMEM; |
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} |
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poll_dev = input_allocate_polled_device(); |
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if (!poll_dev) { |
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pr_err(DRV_NAME "no memory for polled device\n"); |
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error = -ENOMEM; |
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goto err_free_bdev; |
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} |
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poll_dev->private = bdev; |
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poll_dev->poll = gpio_buttons_poll; |
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poll_dev->poll_interval = pdata->poll_interval; |
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input = poll_dev->input; |
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input->evbit[0] = BIT_MASK(EV_KEY); |
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input->name = pdev->name; |
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input->phys = "gpio-buttons/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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for (i = 0; i < pdata->nbuttons; i++) { |
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struct gpio_button *button = &pdata->buttons[i]; |
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unsigned int gpio = button->gpio; |
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unsigned int type = button->type ?: EV_KEY; |
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error = gpio_request(gpio, button->desc ? |
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button->desc : DRV_NAME); |
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if (error) { |
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pr_err(PFX "unable to claim gpio %u, error %d\n", |
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gpio, error); |
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goto err_free_gpio; |
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} |
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error = gpio_direction_input(gpio); |
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if (error) { |
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pr_err(PFX "unable to set direction on gpio %u, " |
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"error %d\n", gpio, error); |
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goto err_free_gpio; |
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} |
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input_set_capability(input, type, button->code); |
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button->count = 0; |
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} |
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bdev->poll_dev = poll_dev; |
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bdev->pdata = pdata; |
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platform_set_drvdata(pdev, bdev); |
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error = input_register_polled_device(poll_dev); |
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if (error) { |
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pr_err(PFX "unable to register polled device, error %d\n", |
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error); |
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goto err_free_gpio; |
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} |
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return 0; |
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err_free_gpio: |
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for (i = i - 1; i >= 0; i--) |
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gpio_free(pdata->buttons[i].gpio); |
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input_free_polled_device(poll_dev); |
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err_free_bdev: |
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kfree(bdev); |
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err: |
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platform_set_drvdata(pdev, NULL); |
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return error; |
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} |
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static int __devexit gpio_buttons_remove(struct platform_device *pdev) |
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{ |
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struct gpio_buttons_dev *bdev = platform_get_drvdata(pdev); |
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struct gpio_buttons_platform_data *pdata = bdev->pdata; |
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int i; |
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input_unregister_polled_device(bdev->poll_dev); |
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for (i = 0; i < pdata->nbuttons; i++) |
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gpio_free(pdata->buttons[i].gpio); |
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input_free_polled_device(bdev->poll_dev); |
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kfree(bdev); |
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platform_set_drvdata(pdev, NULL); |
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return 0; |
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} |
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static struct platform_driver gpio_buttons_driver = { |
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.probe = gpio_buttons_probe, |
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.remove = __devexit_p(gpio_buttons_remove), |
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.driver = { |
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.name = DRV_NAME, |
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.owner = THIS_MODULE, |
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}, |
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}; |
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static int __init gpio_buttons_init(void) |
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{ |
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pr_info(DRV_NAME " driver version " DRV_VERSION "\n"); |
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return platform_driver_register(&gpio_buttons_driver); |
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} |
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static void __exit gpio_buttons_exit(void) |
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{ |
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platform_driver_unregister(&gpio_buttons_driver); |
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} |
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module_init(gpio_buttons_init); |
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module_exit(gpio_buttons_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); |
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MODULE_VERSION(DRV_VERSION); |
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MODULE_DESCRIPTION("Polled buttons driver for CPU GPIOs"); |
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/*
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* Definitions for the GPIO buttons interface driver |
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* |
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* Copyright (C) 2007,2008 Gabor Juhos <juhosg at openwrt.org> |
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* |
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* This file was based on: /include/linux/gpio_keys.h |
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* The original gpio_keys.h seems not to have a license. |
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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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*/ |
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#ifndef _GPIO_BUTTONS_H_ |
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#define _GPIO_BUTTONS_H_ |
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struct gpio_button { |
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int gpio; /* GPIO line number */ |
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int active_low; |
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char *desc; /* button description */ |
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int type; /* input event type (EV_KEY, EV_SW) */ |
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int code; /* input event code (KEY_*, SW_*) */ |
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int count; |
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int threshold; /* count threshold */ |
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}; |
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struct gpio_buttons_platform_data { |
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struct gpio_button *buttons; |
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int nbuttons; /* number of buttons */ |
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int poll_interval; /* polling interval */ |
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}; |
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#endif /* _GPIO_BUTTONS_H_ */ |
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@ -0,0 +1,30 @@ |
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--- linux-2.6.22.orig/drivers/input/misc/Kconfig 2007-08-21 06:33:06.000000000 +0200
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+++ linux-2.6.22/drivers/input/misc/Kconfig 2007-10-08 10:57:23.000000000 +0200
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@@ -178,4 +178,20 @@
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Say Y here if you want to support the built-in real time clock
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of the HP SDC controller.
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+config INPUT_GPIO_BUTTONS
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+ tristate "Polled GPIO buttons interface"
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+ depends on GENERIC_GPIO
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+ select INPUT_POLLDEV
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+ help
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+ This driver implements support for buttons connected
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+ to GPIO pins of various CPUs (and some other chips).
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+
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+ Say Y here if your device has buttons connected
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+ directly to such GPIO pins. Your board-specific
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+ setup logic must also provide a platform device,
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+ with configuration data saying which GPIOs are used.
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+
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+ To compile this driver as a module, choose M here: the
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+ module will be called gpio-buttons.
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+
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endif
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--- linux-2.6.22.4.orig/drivers/input/misc/Makefile 2007-08-21 06:33:06.000000000 +0200
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+++ linux-2.6.22.4/drivers/input/misc/Makefile 2007-10-08 10:50:12.000000000 +0200
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@@ -18,3 +18,4 @@
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obj-$(CONFIG_INPUT_YEALINK) += yealink.o
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obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
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obj-$(CONFIG_INPUT_UINPUT) += uinput.o
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+obj-$(CONFIG_INPUT_GPIO_BUTTONS) += gpio_buttons.o
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@ -0,0 +1,30 @@ |
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--- linux-2.6.23.orig/drivers/input/misc/Kconfig 2007-08-21 06:33:06.000000000 +0200
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+++ linux-2.6.23/drivers/input/misc/Kconfig 2007-10-08 10:57:23.000000000 +0200
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@@ -178,4 +178,20 @@
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Say Y here if you want to support the built-in real time clock
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of the HP SDC controller.
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+config INPUT_GPIO_BUTTONS
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+ tristate "Polled GPIO buttons interface"
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+ depends on GENERIC_GPIO
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+ select INPUT_POLLDEV
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+ help
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+ This driver implements support for buttons connected
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+ to GPIO pins of various CPUs (and some other chips).
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+
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+ Say Y here if your device has buttons connected
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+ directly to such GPIO pins. Your board-specific
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+ setup logic must also provide a platform device,
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+ with configuration data saying which GPIOs are used.
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+
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+ To compile this driver as a module, choose M here: the
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+ module will be called gpio-buttons.
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+
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endif
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--- linux-2.6.23.orig/drivers/input/misc/Makefile 2007-08-21 06:33:06.000000000 +0200
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+++ linux-2.6.23/drivers/input/misc/Makefile 2007-10-08 10:50:12.000000000 +0200
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@@ -18,3 +18,4 @@
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obj-$(CONFIG_INPUT_YEALINK) += yealink.o
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obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
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obj-$(CONFIG_INPUT_UINPUT) += uinput.o
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+obj-$(CONFIG_INPUT_GPIO_BUTTONS) += gpio_buttons.o
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--- linux-2.6.24.2.orig/drivers/input/misc/Kconfig 2007-08-21 06:33:06.000000000 +0200
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+++ linux-2.6.24.2/drivers/input/misc/Kconfig 2007-10-08 10:57:23.000000000 +0200
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@@ -178,4 +178,20 @@
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Say Y here if you want to support the built-in real time clock
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of the HP SDC controller.
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+config INPUT_GPIO_BUTTONS
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+ tristate "Polled GPIO buttons interface"
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+ depends on GENERIC_GPIO
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+ select INPUT_POLLDEV
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+ help
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+ This driver implements support for buttons connected
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+ to GPIO pins of various CPUs (and some other chips).
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+
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+ Say Y here if your device has buttons connected
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+ directly to such GPIO pins. Your board-specific
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+ setup logic must also provide a platform device,
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+ with configuration data saying which GPIOs are used.
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+
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+ To compile this driver as a module, choose M here: the
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+ module will be called gpio-buttons.
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+
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endif
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--- linux-2.6.24.2.orig/drivers/input/misc/Makefile 2007-08-21 06:33:06.000000000 +0200
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+++ linux-2.6.24.2/drivers/input/misc/Makefile 2007-10-08 10:50:12.000000000 +0200
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@@ -18,3 +18,4 @@
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obj-$(CONFIG_INPUT_YEALINK) += yealink.o
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obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
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obj-$(CONFIG_INPUT_UINPUT) += uinput.o
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+obj-$(CONFIG_INPUT_GPIO_BUTTONS) += gpio_buttons.o
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