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package/kernel/button-hotplug/src/button-hotplug.c
343 строки
7 KB
Alan Swanson
button-hotplug: add KEY_POWER2 handling
30 май 2019, 12:55
30 май 2019, 12:55
a462597
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/* * Button Hotplug driver * * 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@nbd.name> * 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/input.h> #include <linux/workqueue.h> #include <linux/skbuff.h> #include <linux/netlink.h> #include <linux/kobject.h> #define DRV_NAME "button-hotplug" #define DRV_VERSION "0.4.1" #define DRV_DESC "Button Hotplug driver" #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 ) #ifndef BIT_MASK #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) #endif struct bh_priv { unsigned long *seen; struct input_handle handle; }; 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; }; 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"), BH_MAP(KEY_POWER, "power"), BH_MAP(KEY_POWER2, "reboot"), BH_MAP(KEY_RFKILL, "rfkill"), BH_MAP(KEY_WPS_BUTTON, "wps"), BH_MAP(KEY_WIMAX, "wwan"), }; /* -------------------------------------------------------------------------*/ 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; } /* -------------------------------------------------------------------------*/ 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 input_handle *handle, unsigned int type, unsigned int code, int value) { struct bh_priv *priv = handle->private; 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[btn]) / HZ, value); priv->seen[btn] = seen; } static int button_hotplug_connect(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id) { struct bh_priv *priv; int ret; int i; for (i = 0; i < ARRAY_SIZE(button_map); i++) if (test_bit(button_map[i].code, dev->keybit)) break; if (i == ARRAY_SIZE(button_map)) return -ENODEV; priv = kzalloc(sizeof(*priv) + (sizeof(unsigned long) * ARRAY_SIZE(button_map)), GFP_KERNEL); if (!priv) return -ENOMEM; priv->seen = (unsigned long *) &priv[1]; priv->handle.private = priv; priv->handle.dev = dev; priv->handle.handler = handler; priv->handle.name = DRV_NAME; ret = input_register_handle(&priv->handle); if (ret) goto err_free_priv; ret = input_open_device(&priv->handle); if (ret) goto err_unregister_handle; BH_DBG("connected to %s\n", dev->name); return 0; err_unregister_handle: input_unregister_handle(&priv->handle); err_free_priv: kfree(priv); return ret; } static void button_hotplug_disconnect(struct input_handle *handle) { struct bh_priv *priv = handle->private; input_close_device(handle); input_unregister_handle(handle); kfree(priv); } static const struct input_device_id button_hotplug_ids[] = { { .flags = INPUT_DEVICE_ID_MATCH_EVBIT, .evbit = { BIT_MASK(EV_KEY) }, }, { /* Terminating entry */ }, }; MODULE_DEVICE_TABLE(input, button_hotplug_ids); static struct input_handler button_hotplug_handler = { .event = button_hotplug_event, .connect = button_hotplug_connect, .disconnect = button_hotplug_disconnect, .name = DRV_NAME, .id_table = button_hotplug_ids, }; /* -------------------------------------------------------------------------*/ static int __init button_hotplug_init(void) { int ret; printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n"); ret = input_register_handler(&button_hotplug_handler); if (ret) BH_ERR("unable to register input handler\n"); return ret; } module_init(button_hotplug_init); static void __exit button_hotplug_exit(void) { input_unregister_handler(&button_hotplug_handler); } module_exit(button_hotplug_exit); MODULE_DESCRIPTION(DRV_DESC); MODULE_VERSION(DRV_VERSION); MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); MODULE_LICENSE("GPL v2");