OpenWrt – Rev 1
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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_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");