From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001 From: James <> Date: Wed, 4 Nov 2015 11:49:21 +0000 Subject: trunk-47381 --- package/kernel/button-hotplug/src/button-hotplug.c | 343 +++++++++++++++++++++ 1 file changed, 343 insertions(+) create mode 100644 package/kernel/button-hotplug/src/button-hotplug.c (limited to 'package/kernel/button-hotplug/src/button-hotplug.c') diff --git a/package/kernel/button-hotplug/src/button-hotplug.c b/package/kernel/button-hotplug/src/button-hotplug.c new file mode 100644 index 0000000..41fdf3a --- /dev/null +++ b/package/kernel/button-hotplug/src/button-hotplug.c @@ -0,0 +1,343 @@ +/* + * Button Hotplug driver + * + * Copyright (C) 2008-2010 Gabor Juhos + * + * Based on the diag.c - GPIO interface driver for Broadcom boards + * Copyright (C) 2006 Mike Baker , + * Copyright (C) 2006-2007 Felix Fietkau + * Copyright (C) 2008 Andy Boyett + * + * 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 +#include +#include +#include + +#include +#include +#include +#include + +#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_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 "); +MODULE_LICENSE("GPL v2"); + -- cgit v1.2.3