You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
343 lines
7.2 KiB
343 lines
7.2 KiB
/*
|
|
* 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@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/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_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");
|
|
|
|
|