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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) 2007-2010 Gabor Juhos <juhosg@openwrt.org>
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+ * Copyright (C) 2010 Nuno Goncalves <nunojpg@gmail.com>
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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/kernel.h>
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+#include <linux/module.h>
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+#include <linux/init.h>
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+#include <linux/slab.h>
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+#include <linux/input.h>
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+#include <linux/input-polldev.h>
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+#include <linux/ioport.h>
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+#include <linux/platform_device.h>
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+#include <linux/gpio.h>
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+#include <linux/gpio_keys.h>
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+
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+#define DRV_NAME "gpio-keys-polled"
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+
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+struct gpio_keys_button_data {
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+ int last_state;
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+ int count;
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+ int threshold;
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+ int can_sleep;
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+};
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+
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+struct gpio_keys_polled_dev {
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+ struct input_polled_dev *poll_dev;
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+ struct device *dev;
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+ struct gpio_keys_platform_data *pdata;
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+ struct gpio_keys_button_data data[0];
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+};
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+
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+static void gpio_keys_polled_check_state(struct input_dev *input,
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+ struct gpio_keys_button *button,
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+ struct gpio_keys_button_data *bdata)
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+{
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+ int state;
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+
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+ if (bdata->can_sleep)
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+ state = !!gpio_get_value_cansleep(button->gpio);
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+ else
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+ state = !!gpio_get_value(button->gpio);
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+
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+ if (state != bdata->last_state) {
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+ unsigned int type = button->type ?: EV_KEY;
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+
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+ input_event(input, type, button->code,
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+ !!(state ^ button->active_low));
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+ input_sync(input);
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+ bdata->count = 0;
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+ bdata->last_state = state;
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+ }
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+}
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+
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+static void gpio_keys_polled_poll(struct input_polled_dev *dev)
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+{
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+ struct gpio_keys_polled_dev *bdev = dev->private;
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+ struct gpio_keys_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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+
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+ for (i = 0; i < bdev->pdata->nbuttons; i++) {
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+ struct gpio_keys_button_data *bdata = &bdev->data[i];
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+
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+ if (bdata->count < bdata->threshold)
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+ bdata->count++;
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+ else
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+ gpio_keys_polled_check_state(input, &pdata->buttons[i],
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+ bdata);
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+ }
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+}
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+
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+static void gpio_keys_polled_open(struct input_polled_dev *dev)
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+{
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+ struct gpio_keys_polled_dev *bdev = dev->private;
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+ struct gpio_keys_platform_data *pdata = bdev->pdata;
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+
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+ if (pdata->enable)
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+ pdata->enable(bdev->dev);
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+}
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+
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+static void gpio_keys_polled_close(struct input_polled_dev *dev)
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+{
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+ struct gpio_keys_polled_dev *bdev = dev->private;
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+ struct gpio_keys_platform_data *pdata = bdev->pdata;
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+
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+ if (pdata->disable)
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+ pdata->disable(bdev->dev);
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+}
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+
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+static int __devinit gpio_keys_polled_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 device *dev = &pdev->dev;
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+ struct gpio_keys_polled_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;
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+ int i;
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+
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+ if (!pdata || !pdata->poll_interval)
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+ return -EINVAL;
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+
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+ bdev = kzalloc(sizeof(struct gpio_keys_polled_dev) +
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+ pdata->nbuttons * sizeof(struct gpio_keys_button_data),
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+ GFP_KERNEL);
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+ if (!bdev) {
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+ dev_err(dev, "no memory for private data\n");
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+ return -ENOMEM;
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+ }
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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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+ dev_err(dev, "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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+
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+ poll_dev->private = bdev;
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+ poll_dev->poll = gpio_keys_polled_poll;
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+ poll_dev->poll_interval = pdata->poll_interval;
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+ poll_dev->open = gpio_keys_polled_open;
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+ poll_dev->close = gpio_keys_polled_close;
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+
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+ input = poll_dev->input;
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+
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+ input->evbit[0] = BIT(EV_KEY);
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+ input->name = pdev->name;
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+ input->phys = DRV_NAME"/input0";
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+ input->dev.parent = &pdev->dev;
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+
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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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+
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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_keys_button_data *bdata = &bdev->data[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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+
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+ if (button->wakeup) {
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+ dev_err(dev, DRV_NAME " does not support wakeup\n");
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+ error = -EINVAL;
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+ goto err_free_gpio;
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+ }
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+
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+ error = gpio_request(gpio,
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+ button->desc ? button->desc : DRV_NAME);
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+ if (error) {
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+ dev_err(dev, "unable to claim gpio %u, err=%d\n",
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+ gpio, error);
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+ goto err_free_gpio;
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+ }
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+
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+ error = gpio_direction_input(gpio);
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+ if (error) {
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+ dev_err(dev,
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+ "unable to set direction on gpio %u, err=%d\n",
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+ gpio, error);
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+ goto err_free_gpio;
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+ }
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+
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+ bdata->can_sleep = gpio_cansleep(gpio);
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+ bdata->last_state = -1;
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+ bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
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+ pdata->poll_interval);
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+
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+ input_set_capability(input, type, button->code);
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+ }
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+
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+ bdev->poll_dev = poll_dev;
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+ bdev->dev = dev;
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+ bdev->pdata = pdata;
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+ platform_set_drvdata(pdev, bdev);
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+
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+ error = input_register_polled_device(poll_dev);
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+ if (error) {
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+ dev_err(dev, "unable to register polled device, err=%d\n",
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+ error);
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+ goto err_free_gpio;
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+ }
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+
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+ /* report initial state of the buttons */
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+ for (i = 0; i < pdata->nbuttons; i++)
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+ gpio_keys_polled_check_state(input, &pdata->buttons[i],
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+ &bdev->data[i]);
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+
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+ return 0;
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+
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+err_free_gpio:
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+ while (--i >= 0)
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+ gpio_free(pdata->buttons[i].gpio);
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+
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+ input_free_polled_device(poll_dev);
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+
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+err_free_bdev:
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+ kfree(bdev);
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+
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+ platform_set_drvdata(pdev, NULL);
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+ return error;
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+}
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+
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+static int __devexit gpio_keys_polled_remove(struct platform_device *pdev)
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+{
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+ struct gpio_keys_polled_dev *bdev = platform_get_drvdata(pdev);
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+ struct gpio_keys_platform_data *pdata = bdev->pdata;
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+ int i;
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+
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+ input_unregister_polled_device(bdev->poll_dev);
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+
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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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+
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+ input_free_polled_device(bdev->poll_dev);
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+
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+ kfree(bdev);
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+ platform_set_drvdata(pdev, NULL);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver gpio_keys_polled_driver = {
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+ .probe = gpio_keys_polled_probe,
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+ .remove = __devexit_p(gpio_keys_polled_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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+
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+static int __init gpio_keys_polled_init(void)
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+{
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+ return platform_driver_register(&gpio_keys_polled_driver);
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+}
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+
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+static void __exit gpio_keys_polled_exit(void)
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+{
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+ platform_driver_unregister(&gpio_keys_polled_driver);
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+}
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+
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+module_init(gpio_keys_polled_init);
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+module_exit(gpio_keys_polled_exit);
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+
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+MODULE_LICENSE("GPL v2");
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+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
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+MODULE_DESCRIPTION("Polled GPIO Buttons driver");
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+MODULE_ALIAS("platform:" DRV_NAME);
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