OpenWrt – Blame information for rev 2

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1 office 1 /*
2 * Button Hotplug driver
3 *
4 * Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
5 *
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>
10 *
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.
14 */
15  
16 #include <linux/module.h>
17 #include <linux/version.h>
18 #include <linux/kmod.h>
19 #include <linux/input.h>
20  
21 #include <linux/workqueue.h>
22 #include <linux/skbuff.h>
23 #include <linux/netlink.h>
24 #include <linux/kobject.h>
25  
26 #define DRV_NAME "button-hotplug"
27 #define DRV_VERSION "0.4.1"
28 #define DRV_DESC "Button Hotplug driver"
29  
30 #define BH_SKB_SIZE 2048
31  
32 #define PFX DRV_NAME ": "
33  
34 #undef BH_DEBUG
35  
36 #ifdef BH_DEBUG
37 #define BH_DBG(fmt, args...) printk(KERN_DEBUG "%s: " fmt, DRV_NAME, ##args )
38 #else
39 #define BH_DBG(fmt, args...) do {} while (0)
40 #endif
41  
42 #define BH_ERR(fmt, args...) printk(KERN_ERR "%s: " fmt, DRV_NAME, ##args )
43  
44 #ifndef BIT_MASK
45 #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
46 #endif
47  
48 struct bh_priv {
49 unsigned long *seen;
50 struct input_handle handle;
51 };
52  
53 struct bh_event {
54 const char *name;
55 char *action;
56 unsigned long seen;
57  
58 struct sk_buff *skb;
59 struct work_struct work;
60 };
61  
62 struct bh_map {
63 unsigned int code;
64 const char *name;
65 };
66  
67 extern u64 uevent_next_seqnum(void);
68  
69 #define BH_MAP(_code, _name) \
70 { \
71 .code = (_code), \
72 .name = (_name), \
73 }
74  
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"),
91 };
92  
93 /* -------------------------------------------------------------------------*/
94  
95 static int bh_event_add_var(struct bh_event *event, int argv,
96 const char *format, ...)
97 {
98 static char buf[128];
99 char *s;
100 va_list args;
101 int len;
102  
103 if (argv)
104 return 0;
105  
106 va_start(args, format);
107 len = vsnprintf(buf, sizeof(buf), format, args);
108 va_end(args);
109  
110 if (len >= sizeof(buf)) {
111 BH_ERR("buffer size too small\n");
112 WARN_ON(1);
113 return -ENOMEM;
114 }
115  
116 s = skb_put(event->skb, len + 1);
117 strcpy(s, buf);
118  
119 BH_DBG("added variable '%s'\n", s);
120  
121 return 0;
122 }
123  
124 static int button_hotplug_fill_event(struct bh_event *event)
125 {
126 int ret;
127  
128 ret = bh_event_add_var(event, 0, "HOME=%s", "/");
129 if (ret)
130 return ret;
131  
132 ret = bh_event_add_var(event, 0, "PATH=%s",
133 "/sbin:/bin:/usr/sbin:/usr/bin");
134 if (ret)
135 return ret;
136  
137 ret = bh_event_add_var(event, 0, "SUBSYSTEM=%s", "button");
138 if (ret)
139 return ret;
140  
141 ret = bh_event_add_var(event, 0, "ACTION=%s", event->action);
142 if (ret)
143 return ret;
144  
145 ret = bh_event_add_var(event, 0, "BUTTON=%s", event->name);
146 if (ret)
147 return ret;
148  
149 ret = bh_event_add_var(event, 0, "SEEN=%ld", event->seen);
150 if (ret)
151 return ret;
152  
153 ret = bh_event_add_var(event, 0, "SEQNUM=%llu", uevent_next_seqnum());
154  
155 return ret;
156 }
157  
158 static void button_hotplug_work(struct work_struct *work)
159 {
160 struct bh_event *event = container_of(work, struct bh_event, work);
161 int ret = 0;
162  
163 event->skb = alloc_skb(BH_SKB_SIZE, GFP_KERNEL);
164 if (!event->skb)
165 goto out_free_event;
166  
167 ret = bh_event_add_var(event, 0, "%s@", event->action);
168 if (ret)
169 goto out_free_skb;
170  
171 ret = button_hotplug_fill_event(event);
172 if (ret)
173 goto out_free_skb;
174  
175 NETLINK_CB(event->skb).dst_group = 1;
176 broadcast_uevent(event->skb, 0, 1, GFP_KERNEL);
177  
178 out_free_skb:
179 if (ret) {
180 BH_ERR("work error %d\n", ret);
181 kfree_skb(event->skb);
182 }
183 out_free_event:
184 kfree(event);
185 }
186  
187 static int button_hotplug_create_event(const char *name, unsigned long seen,
188 int pressed)
189 {
190 struct bh_event *event;
191  
192 BH_DBG("create event, name=%s, seen=%lu, pressed=%d\n",
193 name, seen, pressed);
194  
195 event = kzalloc(sizeof(*event), GFP_KERNEL);
196 if (!event)
197 return -ENOMEM;
198  
199 event->name = name;
200 event->seen = seen;
201 event->action = pressed ? "pressed" : "released";
202  
203 INIT_WORK(&event->work, (void *)(void *)button_hotplug_work);
204 schedule_work(&event->work);
205  
206 return 0;
207 }
208  
209 /* -------------------------------------------------------------------------*/
210  
211 static int button_get_index(unsigned int code)
212 {
213 int i;
214  
215 for (i = 0; i < ARRAY_SIZE(button_map); i++)
216 if (button_map[i].code == code)
217 return i;
218  
219 return -1;
220 }
221 static void button_hotplug_event(struct input_handle *handle,
222 unsigned int type, unsigned int code, int value)
223 {
224 struct bh_priv *priv = handle->private;
225 unsigned long seen = jiffies;
226 int btn;
227  
228 BH_DBG("event type=%u, code=%u, value=%d\n", type, code, value);
229  
230 if (type != EV_KEY)
231 return;
232  
233 btn = button_get_index(code);
234 if (btn < 0)
235 return;
236  
237 button_hotplug_create_event(button_map[btn].name,
238 (seen - priv->seen[btn]) / HZ, value);
239 priv->seen[btn] = seen;
240 }
241  
242 static int button_hotplug_connect(struct input_handler *handler,
243 struct input_dev *dev, const struct input_device_id *id)
244 {
245 struct bh_priv *priv;
246 int ret;
247 int i;
248  
249 for (i = 0; i < ARRAY_SIZE(button_map); i++)
250 if (test_bit(button_map[i].code, dev->keybit))
251 break;
252  
253 if (i == ARRAY_SIZE(button_map))
254 return -ENODEV;
255  
256 priv = kzalloc(sizeof(*priv) +
257 (sizeof(unsigned long) * ARRAY_SIZE(button_map)),
258 GFP_KERNEL);
259 if (!priv)
260 return -ENOMEM;
261  
262 priv->seen = (unsigned long *) &priv[1];
263 priv->handle.private = priv;
264 priv->handle.dev = dev;
265 priv->handle.handler = handler;
266 priv->handle.name = DRV_NAME;
267  
268 ret = input_register_handle(&priv->handle);
269 if (ret)
270 goto err_free_priv;
271  
272 ret = input_open_device(&priv->handle);
273 if (ret)
274 goto err_unregister_handle;
275  
276 BH_DBG("connected to %s\n", dev->name);
277  
278 return 0;
279  
280 err_unregister_handle:
281 input_unregister_handle(&priv->handle);
282  
283 err_free_priv:
284 kfree(priv);
285 return ret;
286 }
287  
288 static void button_hotplug_disconnect(struct input_handle *handle)
289 {
290 struct bh_priv *priv = handle->private;
291  
292 input_close_device(handle);
293 input_unregister_handle(handle);
294  
295 kfree(priv);
296 }
297  
298 static const struct input_device_id button_hotplug_ids[] = {
299 {
300 .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
301 .evbit = { BIT_MASK(EV_KEY) },
302 },
303 {
304 /* Terminating entry */
305 },
306 };
307  
308 MODULE_DEVICE_TABLE(input, button_hotplug_ids);
309  
310 static struct input_handler button_hotplug_handler = {
311 .event = button_hotplug_event,
312 .connect = button_hotplug_connect,
313 .disconnect = button_hotplug_disconnect,
314 .name = DRV_NAME,
315 .id_table = button_hotplug_ids,
316 };
317  
318 /* -------------------------------------------------------------------------*/
319  
320 static int __init button_hotplug_init(void)
321 {
322 int ret;
323  
324 printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
325 ret = input_register_handler(&button_hotplug_handler);
326 if (ret)
327 BH_ERR("unable to register input handler\n");
328  
329 return ret;
330 }
331 module_init(button_hotplug_init);
332  
333 static void __exit button_hotplug_exit(void)
334 {
335 input_unregister_handler(&button_hotplug_handler);
336 }
337 module_exit(button_hotplug_exit);
338  
339 MODULE_DESCRIPTION(DRV_DESC);
340 MODULE_VERSION(DRV_VERSION);
341 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
342 MODULE_LICENSE("GPL v2");
343