diff options
Diffstat (limited to 'package/gpio-button-hotplug')
| -rw-r--r-- | package/gpio-button-hotplug/Makefile | 44 | ||||
| -rw-r--r-- | package/gpio-button-hotplug/src/Makefile | 1 | ||||
| -rw-r--r-- | package/gpio-button-hotplug/src/gpio-button-hotplug.c | 450 |
3 files changed, 0 insertions, 495 deletions
diff --git a/package/gpio-button-hotplug/Makefile b/package/gpio-button-hotplug/Makefile deleted file mode 100644 index adb9a4526..000000000 --- a/package/gpio-button-hotplug/Makefile +++ /dev/null @@ -1,44 +0,0 @@ -# -# Copyright (C) 2008-2012 OpenWrt.org -# -# This is free software, licensed under the GNU General Public License v2. -# See /LICENSE for more information. -# - -include $(TOPDIR)/rules.mk -include $(INCLUDE_DIR)/kernel.mk - -PKG_NAME:=gpio-button-hotplug -PKG_RELEASE:=1 - -include $(INCLUDE_DIR)/package.mk - -define KernelPackage/gpio-button-hotplug - SUBMENU:=Other modules - TITLE:=Simple GPIO Button Hotplug driver - FILES:=$(PKG_BUILD_DIR)/gpio-button-hotplug.ko - AUTOLOAD:=$(call AutoLoad,30,gpio-button-hotplug) - KCONFIG:= -endef - -define KernelPackage/button-hotplug/description - Kernel module to generate GPIO button hotplug events -endef - -MAKE_OPTS:= \ - ARCH="$(LINUX_KARCH)" \ - CROSS_COMPILE="$(TARGET_CROSS)" \ - SUBDIRS="$(PKG_BUILD_DIR)" - -define Build/Prepare - mkdir -p $(PKG_BUILD_DIR) - $(CP) ./src/* $(PKG_BUILD_DIR)/ -endef - -define Build/Compile - $(MAKE) -C "$(LINUX_DIR)" \ - $(MAKE_OPTS) \ - modules -endef - -$(eval $(call KernelPackage,gpio-button-hotplug)) diff --git a/package/gpio-button-hotplug/src/Makefile b/package/gpio-button-hotplug/src/Makefile deleted file mode 100644 index e96886563..000000000 --- a/package/gpio-button-hotplug/src/Makefile +++ /dev/null @@ -1 +0,0 @@ -obj-m += gpio-button-hotplug.o diff --git a/package/gpio-button-hotplug/src/gpio-button-hotplug.c b/package/gpio-button-hotplug/src/gpio-button-hotplug.c deleted file mode 100644 index d25e70fec..000000000 --- a/package/gpio-button-hotplug/src/gpio-button-hotplug.c +++ /dev/null @@ -1,450 +0,0 @@ -/* - * 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); |