2 * Button Hotplug driver
4 * Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
6 * Based on the diag.c - GPIO interface driver for Broadcom boards
7 * Copyright (C) 2006 Mike Baker <mbm@openwrt.org>,
8 * Copyright (C) 2006-2007 Felix Fietkau <nbd@nbd.name>
9 * Copyright (C) 2008 Andy Boyett <agb@openwrt.org>
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License version 2 as published
13 * by the Free Software Foundation.
16 #include <linux/module.h>
17 #include <linux/version.h>
18 #include <linux/kmod.h>
19 #include <linux/input.h>
21 #include <linux/workqueue.h>
22 #include <linux/skbuff.h>
23 #include <linux/netlink.h>
24 #include <linux/kobject.h>
26 #define DRV_NAME "button-hotplug"
27 #define DRV_VERSION "0.4.1"
28 #define DRV_DESC "Button Hotplug driver"
30 #define BH_SKB_SIZE 2048
32 #define PFX DRV_NAME ": "
37 #define BH_DBG(fmt, args...) printk(KERN_DEBUG "%s: " fmt, DRV_NAME, ##args )
39 #define BH_DBG(fmt, args...) do {} while (0)
42 #define BH_ERR(fmt, args...) printk(KERN_ERR "%s: " fmt, DRV_NAME, ##args )
45 #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
50 struct input_handle handle
;
59 struct work_struct work
;
67 extern u64
uevent_next_seqnum(void);
69 #define BH_MAP(_code, _name) \
75 static struct bh_map button_map
[] = {
76 BH_MAP(BTN_0
, "BTN_0"),
77 BH_MAP(BTN_1
, "BTN_1"),
78 BH_MAP(BTN_2
, "BTN_2"),
79 BH_MAP(BTN_3
, "BTN_3"),
80 BH_MAP(BTN_4
, "BTN_4"),
81 BH_MAP(BTN_5
, "BTN_5"),
82 BH_MAP(BTN_6
, "BTN_6"),
83 BH_MAP(BTN_7
, "BTN_7"),
84 BH_MAP(BTN_8
, "BTN_8"),
85 BH_MAP(BTN_9
, "BTN_9"),
86 BH_MAP(KEY_RESTART
, "reset"),
87 BH_MAP(KEY_POWER
, "power"),
88 BH_MAP(KEY_POWER2
, "reboot"),
89 BH_MAP(KEY_RFKILL
, "rfkill"),
90 BH_MAP(KEY_WPS_BUTTON
, "wps"),
91 BH_MAP(KEY_WIMAX
, "wwan"),
94 /* -------------------------------------------------------------------------*/
96 static int bh_event_add_var(struct bh_event
*event
, int argv
,
97 const char *format
, ...)
107 va_start(args
, format
);
108 len
= vsnprintf(buf
, sizeof(buf
), format
, args
);
111 if (len
>= sizeof(buf
)) {
112 BH_ERR("buffer size too small\n");
117 s
= skb_put(event
->skb
, len
+ 1);
120 BH_DBG("added variable '%s'\n", s
);
125 static int button_hotplug_fill_event(struct bh_event
*event
)
129 ret
= bh_event_add_var(event
, 0, "HOME=%s", "/");
133 ret
= bh_event_add_var(event
, 0, "PATH=%s",
134 "/sbin:/bin:/usr/sbin:/usr/bin");
138 ret
= bh_event_add_var(event
, 0, "SUBSYSTEM=%s", "button");
142 ret
= bh_event_add_var(event
, 0, "ACTION=%s", event
->action
);
146 ret
= bh_event_add_var(event
, 0, "BUTTON=%s", event
->name
);
150 ret
= bh_event_add_var(event
, 0, "SEEN=%ld", event
->seen
);
154 ret
= bh_event_add_var(event
, 0, "SEQNUM=%llu", uevent_next_seqnum());
159 static void button_hotplug_work(struct work_struct
*work
)
161 struct bh_event
*event
= container_of(work
, struct bh_event
, work
);
164 event
->skb
= alloc_skb(BH_SKB_SIZE
, GFP_KERNEL
);
168 ret
= bh_event_add_var(event
, 0, "%s@", event
->action
);
172 ret
= button_hotplug_fill_event(event
);
176 NETLINK_CB(event
->skb
).dst_group
= 1;
177 broadcast_uevent(event
->skb
, 0, 1, GFP_KERNEL
);
181 BH_ERR("work error %d\n", ret
);
182 kfree_skb(event
->skb
);
188 static int button_hotplug_create_event(const char *name
, unsigned long seen
,
191 struct bh_event
*event
;
193 BH_DBG("create event, name=%s, seen=%lu, pressed=%d\n",
194 name
, seen
, pressed
);
196 event
= kzalloc(sizeof(*event
), GFP_KERNEL
);
202 event
->action
= pressed
? "pressed" : "released";
204 INIT_WORK(&event
->work
, (void *)(void *)button_hotplug_work
);
205 schedule_work(&event
->work
);
210 /* -------------------------------------------------------------------------*/
212 static int button_get_index(unsigned int code
)
216 for (i
= 0; i
< ARRAY_SIZE(button_map
); i
++)
217 if (button_map
[i
].code
== code
)
222 static void button_hotplug_event(struct input_handle
*handle
,
223 unsigned int type
, unsigned int code
, int value
)
225 struct bh_priv
*priv
= handle
->private;
226 unsigned long seen
= jiffies
;
229 BH_DBG("event type=%u, code=%u, value=%d\n", type
, code
, value
);
234 btn
= button_get_index(code
);
238 button_hotplug_create_event(button_map
[btn
].name
,
239 (seen
- priv
->seen
[btn
]) / HZ
, value
);
240 priv
->seen
[btn
] = seen
;
243 static int button_hotplug_connect(struct input_handler
*handler
,
244 struct input_dev
*dev
, const struct input_device_id
*id
)
246 struct bh_priv
*priv
;
250 for (i
= 0; i
< ARRAY_SIZE(button_map
); i
++)
251 if (test_bit(button_map
[i
].code
, dev
->keybit
))
254 if (i
== ARRAY_SIZE(button_map
))
257 priv
= kzalloc(sizeof(*priv
) +
258 (sizeof(unsigned long) * ARRAY_SIZE(button_map
)),
263 priv
->seen
= (unsigned long *) &priv
[1];
264 priv
->handle
.private = priv
;
265 priv
->handle
.dev
= dev
;
266 priv
->handle
.handler
= handler
;
267 priv
->handle
.name
= DRV_NAME
;
269 ret
= input_register_handle(&priv
->handle
);
273 ret
= input_open_device(&priv
->handle
);
275 goto err_unregister_handle
;
277 BH_DBG("connected to %s\n", dev
->name
);
281 err_unregister_handle
:
282 input_unregister_handle(&priv
->handle
);
289 static void button_hotplug_disconnect(struct input_handle
*handle
)
291 struct bh_priv
*priv
= handle
->private;
293 input_close_device(handle
);
294 input_unregister_handle(handle
);
299 static const struct input_device_id button_hotplug_ids
[] = {
301 .flags
= INPUT_DEVICE_ID_MATCH_EVBIT
,
302 .evbit
= { BIT_MASK(EV_KEY
) },
305 /* Terminating entry */
309 MODULE_DEVICE_TABLE(input
, button_hotplug_ids
);
311 static struct input_handler button_hotplug_handler
= {
312 .event
= button_hotplug_event
,
313 .connect
= button_hotplug_connect
,
314 .disconnect
= button_hotplug_disconnect
,
316 .id_table
= button_hotplug_ids
,
319 /* -------------------------------------------------------------------------*/
321 static int __init
button_hotplug_init(void)
325 printk(KERN_INFO DRV_DESC
" version " DRV_VERSION
"\n");
326 ret
= input_register_handler(&button_hotplug_handler
);
328 BH_ERR("unable to register input handler\n");
332 module_init(button_hotplug_init
);
334 static void __exit
button_hotplug_exit(void)
336 input_unregister_handler(&button_hotplug_handler
);
338 module_exit(button_hotplug_exit
);
340 MODULE_DESCRIPTION(DRV_DESC
);
341 MODULE_VERSION(DRV_VERSION
);
342 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
343 MODULE_LICENSE("GPL v2");