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@openwrt.org>
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_RFKILL
, "rfkill"),
89 BH_MAP(KEY_WPS_BUTTON
, "wps"),
90 BH_MAP(KEY_WIMAX
, "wwan"),
93 /* -------------------------------------------------------------------------*/
95 static int bh_event_add_var(struct bh_event
*event
, int argv
,
96 const char *format
, ...)
106 va_start(args
, format
);
107 len
= vsnprintf(buf
, sizeof(buf
), format
, args
);
110 if (len
>= sizeof(buf
)) {
111 BH_ERR("buffer size too small\n");
116 s
= skb_put(event
->skb
, len
+ 1);
119 BH_DBG("added variable '%s'\n", s
);
124 static int button_hotplug_fill_event(struct bh_event
*event
)
128 ret
= bh_event_add_var(event
, 0, "HOME=%s", "/");
132 ret
= bh_event_add_var(event
, 0, "PATH=%s",
133 "/sbin:/bin:/usr/sbin:/usr/bin");
137 ret
= bh_event_add_var(event
, 0, "SUBSYSTEM=%s", "button");
141 ret
= bh_event_add_var(event
, 0, "ACTION=%s", event
->action
);
145 ret
= bh_event_add_var(event
, 0, "BUTTON=%s", event
->name
);
149 ret
= bh_event_add_var(event
, 0, "SEEN=%ld", event
->seen
);
153 ret
= bh_event_add_var(event
, 0, "SEQNUM=%llu", uevent_next_seqnum());
158 static void button_hotplug_work(struct work_struct
*work
)
160 struct bh_event
*event
= container_of(work
, struct bh_event
, work
);
163 event
->skb
= alloc_skb(BH_SKB_SIZE
, GFP_KERNEL
);
167 ret
= bh_event_add_var(event
, 0, "%s@", event
->action
);
171 ret
= button_hotplug_fill_event(event
);
175 NETLINK_CB(event
->skb
).dst_group
= 1;
176 broadcast_uevent(event
->skb
, 0, 1, GFP_KERNEL
);
180 BH_ERR("work error %d\n", ret
);
181 kfree_skb(event
->skb
);
187 static int button_hotplug_create_event(const char *name
, unsigned long seen
,
190 struct bh_event
*event
;
192 BH_DBG("create event, name=%s, seen=%lu, pressed=%d\n",
193 name
, seen
, pressed
);
195 event
= kzalloc(sizeof(*event
), GFP_KERNEL
);
201 event
->action
= pressed
? "pressed" : "released";
203 INIT_WORK(&event
->work
, (void *)(void *)button_hotplug_work
);
204 schedule_work(&event
->work
);
209 /* -------------------------------------------------------------------------*/
211 #ifdef CONFIG_HOTPLUG
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 void button_hotplug_event(struct input_handle
*handle
,
244 unsigned int type
, unsigned int code
, int value
)
247 #endif /* CONFIG_HOTPLUG */
249 static int button_hotplug_connect(struct input_handler
*handler
,
250 struct input_dev
*dev
, const struct input_device_id
*id
)
252 struct bh_priv
*priv
;
256 for (i
= 0; i
< ARRAY_SIZE(button_map
); i
++)
257 if (test_bit(button_map
[i
].code
, dev
->keybit
))
260 if (i
== ARRAY_SIZE(button_map
))
263 priv
= kzalloc(sizeof(*priv
) +
264 (sizeof(unsigned long) * ARRAY_SIZE(button_map
)),
269 priv
->seen
= (unsigned long *) &priv
[1];
270 priv
->handle
.private = priv
;
271 priv
->handle
.dev
= dev
;
272 priv
->handle
.handler
= handler
;
273 priv
->handle
.name
= DRV_NAME
;
275 ret
= input_register_handle(&priv
->handle
);
279 ret
= input_open_device(&priv
->handle
);
281 goto err_unregister_handle
;
283 BH_DBG("connected to %s\n", dev
->name
);
287 err_unregister_handle
:
288 input_unregister_handle(&priv
->handle
);
295 static void button_hotplug_disconnect(struct input_handle
*handle
)
297 struct bh_priv
*priv
= handle
->private;
299 input_close_device(handle
);
300 input_unregister_handle(handle
);
305 static const struct input_device_id button_hotplug_ids
[] = {
307 .flags
= INPUT_DEVICE_ID_MATCH_EVBIT
,
308 .evbit
= { BIT_MASK(EV_KEY
) },
311 /* Terminating entry */
315 MODULE_DEVICE_TABLE(input
, button_hotplug_ids
);
317 static struct input_handler button_hotplug_handler
= {
318 .event
= button_hotplug_event
,
319 .connect
= button_hotplug_connect
,
320 .disconnect
= button_hotplug_disconnect
,
322 .id_table
= button_hotplug_ids
,
325 /* -------------------------------------------------------------------------*/
327 static int __init
button_hotplug_init(void)
331 printk(KERN_INFO DRV_DESC
" version " DRV_VERSION
"\n");
332 ret
= input_register_handler(&button_hotplug_handler
);
334 BH_ERR("unable to register input handler\n");
338 module_init(button_hotplug_init
);
340 static void __exit
button_hotplug_exit(void)
342 input_unregister_handler(&button_hotplug_handler
);
344 module_exit(button_hotplug_exit
);
346 MODULE_DESCRIPTION(DRV_DESC
);
347 MODULE_VERSION(DRV_VERSION
);
348 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
349 MODULE_LICENSE("GPL v2");