+++ /dev/null
-/*
- * GPIO Button Hotplug driver
- *
- * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
- *
- * Based on the diag.c - GPIO interface driver for Broadcom boards
- * Copyright (C) 2006 Mike Baker <mbm@openwrt.org>,
- * Copyright (C) 2006-2007 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2008 Andy Boyett <agb@openwrt.org>
- *
- * 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/kmod.h>
-
-#include <linux/workqueue.h>
-#include <linux/skbuff.h>
-#include <linux/netlink.h>
-#include <linux/kobject.h>
-#include <linux/input.h>
-#include <linux/platform_device.h>
-#include <linux/gpio.h>
-#include <linux/gpio_keys.h>
-
-#define DRV_NAME "gpio-keys-polled"
-
-#define BH_SKB_SIZE 2048
-
-#define PFX DRV_NAME ": "
-
-#undef BH_DEBUG
-
-#ifdef BH_DEBUG
-#define BH_DBG(fmt, args...) printk(KERN_DEBUG "%s: " fmt, DRV_NAME, ##args )
-#else
-#define BH_DBG(fmt, args...) do {} while (0)
-#endif
-
-#define BH_ERR(fmt, args...) printk(KERN_ERR "%s: " fmt, DRV_NAME, ##args )
-
-struct bh_priv {
- unsigned long seen;
-};
-
-struct bh_event {
- const char *name;
- char *action;
- unsigned long seen;
-
- struct sk_buff *skb;
- struct work_struct work;
-};
-
-struct bh_map {
- unsigned int code;
- const char *name;
-};
-
-struct gpio_keys_button_data {
- struct delayed_work work;
- struct bh_priv bh;
- int last_state;
- int count;
- int threshold;
- int can_sleep;
-};
-
-extern u64 uevent_next_seqnum(void);
-
-#define BH_MAP(_code, _name) \
- { \
- .code = (_code), \
- .name = (_name), \
- }
-
-static struct bh_map button_map[] = {
- BH_MAP(BTN_0, "BTN_0"),
- BH_MAP(BTN_1, "BTN_1"),
- BH_MAP(BTN_2, "BTN_2"),
- BH_MAP(BTN_3, "BTN_3"),
- BH_MAP(BTN_4, "BTN_4"),
- BH_MAP(BTN_5, "BTN_5"),
- BH_MAP(BTN_6, "BTN_6"),
- BH_MAP(BTN_7, "BTN_7"),
- BH_MAP(BTN_8, "BTN_8"),
- BH_MAP(BTN_9, "BTN_9"),
- BH_MAP(KEY_RESTART, "reset"),
-#ifdef KEY_WPS_BUTTON
- BH_MAP(KEY_WPS_BUTTON, "wps"),
-#endif /* KEY_WPS_BUTTON */
-};
-
-/* -------------------------------------------------------------------------*/
-
-static int bh_event_add_var(struct bh_event *event, int argv,
- const char *format, ...)
-{
- static char buf[128];
- char *s;
- va_list args;
- int len;
-
- if (argv)
- return 0;
-
- va_start(args, format);
- len = vsnprintf(buf, sizeof(buf), format, args);
- va_end(args);
-
- if (len >= sizeof(buf)) {
- BH_ERR("buffer size too small\n");
- WARN_ON(1);
- return -ENOMEM;
- }
-
- s = skb_put(event->skb, len + 1);
- strcpy(s, buf);
-
- BH_DBG("added variable '%s'\n", s);
-
- return 0;
-}
-
-static int button_hotplug_fill_event(struct bh_event *event)
-{
- int ret;
-
- ret = bh_event_add_var(event, 0, "HOME=%s", "/");
- if (ret)
- return ret;
-
- ret = bh_event_add_var(event, 0, "PATH=%s",
- "/sbin:/bin:/usr/sbin:/usr/bin");
- if (ret)
- return ret;
-
- ret = bh_event_add_var(event, 0, "SUBSYSTEM=%s", "button");
- if (ret)
- return ret;
-
- ret = bh_event_add_var(event, 0, "ACTION=%s", event->action);
- if (ret)
- return ret;
-
- ret = bh_event_add_var(event, 0, "BUTTON=%s", event->name);
- if (ret)
- return ret;
-
- ret = bh_event_add_var(event, 0, "SEEN=%ld", event->seen);
- if (ret)
- return ret;
-
- ret = bh_event_add_var(event, 0, "SEQNUM=%llu", uevent_next_seqnum());
-
- return ret;
-}
-
-static void button_hotplug_work(struct work_struct *work)
-{
- struct bh_event *event = container_of(work, struct bh_event, work);
- int ret = 0;
-
- event->skb = alloc_skb(BH_SKB_SIZE, GFP_KERNEL);
- if (!event->skb)
- goto out_free_event;
-
- ret = bh_event_add_var(event, 0, "%s@", event->action);
- if (ret)
- goto out_free_skb;
-
- ret = button_hotplug_fill_event(event);
- if (ret)
- goto out_free_skb;
-
- NETLINK_CB(event->skb).dst_group = 1;
- broadcast_uevent(event->skb, 0, 1, GFP_KERNEL);
-
- out_free_skb:
- if (ret) {
- BH_ERR("work error %d\n", ret);
- kfree_skb(event->skb);
- }
- out_free_event:
- kfree(event);
-}
-
-static int button_hotplug_create_event(const char *name, unsigned long seen,
- int pressed)
-{
- struct bh_event *event;
-
- BH_DBG("create event, name=%s, seen=%lu, pressed=%d\n",
- name, seen, pressed);
-
- event = kzalloc(sizeof(*event), GFP_KERNEL);
- if (!event)
- return -ENOMEM;
-
- event->name = name;
- event->seen = seen;
- event->action = pressed ? "pressed" : "released";
-
- INIT_WORK(&event->work, (void *)(void *)button_hotplug_work);
- schedule_work(&event->work);
-
- return 0;
-}
-
-/* -------------------------------------------------------------------------*/
-
-#ifdef CONFIG_HOTPLUG
-static int button_get_index(unsigned int code)
-{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(button_map); i++)
- if (button_map[i].code == code)
- return i;
-
- return -1;
-}
-static void button_hotplug_event(struct gpio_keys_button_data *data,
- unsigned int type, unsigned int code, int value)
-{
- struct bh_priv *priv = &data->bh;
- unsigned long seen = jiffies;
- int btn;
-
- BH_DBG("event type=%u, code=%u, value=%d\n", type, code, value);
-
- if (type != EV_KEY)
- return;
-
- btn = button_get_index(code);
- if (btn < 0)
- return;
-
- button_hotplug_create_event(button_map[btn].name,
- (seen - priv->seen) / HZ, value);
- priv->seen = seen;
-}
-#else
-static void button_hotplug_event(struct gpio_keys_button_data *data,
- unsigned int type, unsigned int code, int value)
-{
-}
-#endif /* CONFIG_HOTPLUG */
-
-struct gpio_keys_polled_dev {
- struct delayed_work work;
-
- struct device *dev;
- struct gpio_keys_platform_data *pdata;
- struct gpio_keys_button_data data[0];
-};
-
-static void gpio_keys_polled_check_state(struct gpio_keys_button *button,
- struct gpio_keys_button_data *bdata)
-{
- int state;
-
- if (bdata->can_sleep)
- state = !!gpio_get_value_cansleep(button->gpio);
- else
- state = !!gpio_get_value(button->gpio);
-
- state = !!(state ^ button->active_low);
- if (state != bdata->last_state) {
- unsigned int type = button->type ?: EV_KEY;
-
- button_hotplug_event(bdata, type, button->code, state);
- bdata->count = 0;
- bdata->last_state = state;
- }
-}
-
-static void gpio_keys_polled_queue_work(struct gpio_keys_polled_dev *bdev)
-{
- struct gpio_keys_platform_data *pdata = bdev->pdata;
- unsigned long delay = msecs_to_jiffies(pdata->poll_interval);
-
- if (delay >= HZ)
- delay = round_jiffies_relative(delay);
- schedule_delayed_work(&bdev->work, delay);
-}
-
-static void gpio_keys_polled_poll(struct work_struct *work)
-{
- struct gpio_keys_polled_dev *bdev =
- container_of(work, struct gpio_keys_polled_dev, work.work);
- struct gpio_keys_platform_data *pdata = bdev->pdata;
- int i;
-
- for (i = 0; i < bdev->pdata->nbuttons; i++) {
- struct gpio_keys_button_data *bdata = &bdev->data[i];
-
- if (bdata->count < bdata->threshold)
- bdata->count++;
- else
- gpio_keys_polled_check_state(&pdata->buttons[i], bdata);
- }
- gpio_keys_polled_queue_work(bdev);
-}
-
-static void __devinit gpio_keys_polled_open(struct gpio_keys_polled_dev *bdev)
-{
- struct gpio_keys_platform_data *pdata = bdev->pdata;
- int i;
-
- if (pdata->enable)
- pdata->enable(bdev->dev);
-
- /* report initial state of the buttons */
- for (i = 0; i < pdata->nbuttons; i++)
- gpio_keys_polled_check_state(&pdata->buttons[i], &bdev->data[i]);
-
- gpio_keys_polled_queue_work(bdev);
-}
-
-static void __devexit gpio_keys_polled_close(struct gpio_keys_polled_dev *bdev)
-{
- struct gpio_keys_platform_data *pdata = bdev->pdata;
-
- cancel_delayed_work_sync(&bdev->work);
-
- if (pdata->disable)
- pdata->disable(bdev->dev);
-}
-
-static int __devinit gpio_keys_polled_probe(struct platform_device *pdev)
-{
- struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
- struct device *dev = &pdev->dev;
- struct gpio_keys_polled_dev *bdev;
- int error;
- int i;
-
- if (!pdata || !pdata->poll_interval)
- return -EINVAL;
-
- bdev = kzalloc(sizeof(struct gpio_keys_polled_dev) +
- pdata->nbuttons * sizeof(struct gpio_keys_button_data),
- GFP_KERNEL);
- if (!bdev) {
- dev_err(dev, "no memory for private data\n");
- return -ENOMEM;
- }
-
- for (i = 0; i < pdata->nbuttons; i++) {
- struct gpio_keys_button *button = &pdata->buttons[i];
- struct gpio_keys_button_data *bdata = &bdev->data[i];
- unsigned int gpio = button->gpio;
-
- if (button->wakeup) {
- dev_err(dev, DRV_NAME " does not support wakeup\n");
- error = -EINVAL;
- goto err_free_gpio;
- }
-
- 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;
- }
-
- bdata->can_sleep = gpio_cansleep(gpio);
- bdata->last_state = 0;
- bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
- pdata->poll_interval);
- }
-
- bdev->dev = &pdev->dev;
- bdev->pdata = pdata;
- platform_set_drvdata(pdev, bdev);
-
- INIT_DELAYED_WORK(&bdev->work, gpio_keys_polled_poll);
-
- gpio_keys_polled_open(bdev);
-
- return 0;
-
-err_free_gpio:
- while (--i >= 0)
- gpio_free(pdata->buttons[i].gpio);
-
- kfree(bdev);
- platform_set_drvdata(pdev, NULL);
-
- return error;
-}
-
-static int __devexit gpio_keys_polled_remove(struct platform_device *pdev)
-{
- struct gpio_keys_polled_dev *bdev = platform_get_drvdata(pdev);
- struct gpio_keys_platform_data *pdata = bdev->pdata;
- int i = pdata->nbuttons;
-
- gpio_keys_polled_close(bdev);
-
- while (--i >= 0)
- gpio_free(pdata->buttons[i].gpio);
-
- kfree(bdev);
- platform_set_drvdata(pdev, NULL);
-
- return 0;
-}
-
-static struct platform_driver gpio_keys_polled_driver = {
- .probe = gpio_keys_polled_probe,
- .remove = __devexit_p(gpio_keys_polled_remove),
- .driver = {
- .name = DRV_NAME,
- .owner = THIS_MODULE,
- },
-};
-
-static int __init gpio_keys_polled_init(void)
-{
- return platform_driver_register(&gpio_keys_polled_driver);
-}
-
-static void __exit gpio_keys_polled_exit(void)
-{
- platform_driver_unregister(&gpio_keys_polled_driver);
-}
-
-module_init(gpio_keys_polled_init);
-module_exit(gpio_keys_polled_exit);
-
-MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
-MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
-MODULE_DESCRIPTION("Polled GPIO Buttons hotplug driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:" DRV_NAME);
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