Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / drivers / leds / dell-led.c
1 /*
2  * dell_led.c - Dell LED Driver
3  *
4  * Copyright (C) 2010 Dell Inc.
5  * Louis Davis <louis_davis@dell.com>
6  * Jim Dailey <jim_dailey@dell.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation.
11  *
12  */
13
14 #include <linux/acpi.h>
15 #include <linux/leds.h>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/dmi.h>
19 #include <linux/dell-led.h>
20
21 MODULE_AUTHOR("Louis Davis/Jim Dailey");
22 MODULE_DESCRIPTION("Dell LED Control Driver");
23 MODULE_LICENSE("GPL");
24
25 #define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396"
26 #define DELL_APP_GUID "A80593CE-A997-11DA-B012-B622A1EF5492"
27 MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID);
28
29 /* Error Result Codes: */
30 #define INVALID_DEVICE_ID       250
31 #define INVALID_PARAMETER       251
32 #define INVALID_BUFFER          252
33 #define INTERFACE_ERROR         253
34 #define UNSUPPORTED_COMMAND     254
35 #define UNSPECIFIED_ERROR       255
36
37 /* Device ID */
38 #define DEVICE_ID_PANEL_BACK    1
39
40 /* LED Commands */
41 #define CMD_LED_ON      16
42 #define CMD_LED_OFF     17
43 #define CMD_LED_BLINK   18
44
45 struct app_wmi_args {
46         u16 class;
47         u16 selector;
48         u32 arg1;
49         u32 arg2;
50         u32 arg3;
51         u32 arg4;
52         u32 res1;
53         u32 res2;
54         u32 res3;
55         u32 res4;
56         char dummy[92];
57 };
58
59 #define GLOBAL_MIC_MUTE_ENABLE  0x364
60 #define GLOBAL_MIC_MUTE_DISABLE 0x365
61
62 struct dell_bios_data_token {
63         u16 tokenid;
64         u16 location;
65         u16 value;
66 };
67
68 struct __attribute__ ((__packed__)) dell_bios_calling_interface {
69         struct  dmi_header header;
70         u16     cmd_io_addr;
71         u8      cmd_io_code;
72         u32     supported_cmds;
73         struct  dell_bios_data_token damap[];
74 };
75
76 static struct dell_bios_data_token dell_mic_tokens[2];
77
78 static int dell_wmi_perform_query(struct app_wmi_args *args)
79 {
80         struct app_wmi_args *bios_return;
81         union acpi_object *obj;
82         struct acpi_buffer input;
83         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
84         acpi_status status;
85         u32 rc = -EINVAL;
86
87         input.length = 128;
88         input.pointer = args;
89
90         status = wmi_evaluate_method(DELL_APP_GUID, 0, 1, &input, &output);
91         if (!ACPI_SUCCESS(status))
92                 goto err_out0;
93
94         obj = output.pointer;
95         if (!obj)
96                 goto err_out0;
97
98         if (obj->type != ACPI_TYPE_BUFFER)
99                 goto err_out1;
100
101         bios_return = (struct app_wmi_args *)obj->buffer.pointer;
102         rc = bios_return->res1;
103         if (rc)
104                 goto err_out1;
105
106         memcpy(args, bios_return, sizeof(struct app_wmi_args));
107         rc = 0;
108
109  err_out1:
110         kfree(obj);
111  err_out0:
112         return rc;
113 }
114
115 static void __init find_micmute_tokens(const struct dmi_header *dm, void *dummy)
116 {
117         struct dell_bios_calling_interface *calling_interface;
118         struct dell_bios_data_token *token;
119         int token_size = sizeof(struct dell_bios_data_token);
120         int i = 0;
121
122         if (dm->type == 0xda && dm->length > 17) {
123                 calling_interface = container_of(dm,
124                                 struct dell_bios_calling_interface, header);
125
126                 token = &calling_interface->damap[i];
127                 while (token->tokenid != 0xffff) {
128                         if (token->tokenid == GLOBAL_MIC_MUTE_DISABLE)
129                                 memcpy(&dell_mic_tokens[0], token, token_size);
130                         else if (token->tokenid == GLOBAL_MIC_MUTE_ENABLE)
131                                 memcpy(&dell_mic_tokens[1], token, token_size);
132
133                         i++;
134                         token = &calling_interface->damap[i];
135                 }
136         }
137 }
138
139 static int dell_micmute_led_set(int state)
140 {
141         struct app_wmi_args args;
142         struct dell_bios_data_token *token;
143
144         if (!wmi_has_guid(DELL_APP_GUID))
145                 return -ENODEV;
146
147         if (state == 0 || state == 1)
148                 token = &dell_mic_tokens[state];
149         else
150                 return -EINVAL;
151
152         memset(&args, 0, sizeof(struct app_wmi_args));
153
154         args.class = 1;
155         args.arg1 = token->location;
156         args.arg2 = token->value;
157
158         dell_wmi_perform_query(&args);
159
160         return state;
161 }
162
163 int dell_app_wmi_led_set(int whichled, int on)
164 {
165         int state = 0;
166
167         switch (whichled) {
168         case DELL_LED_MICMUTE:
169                 state = dell_micmute_led_set(on);
170                 break;
171         default:
172                 pr_warn("led type %x is not supported\n", whichled);
173                 break;
174         }
175
176         return state;
177 }
178 EXPORT_SYMBOL_GPL(dell_app_wmi_led_set);
179
180 static int __init dell_micmute_led_init(void)
181 {
182         memset(dell_mic_tokens, 0, sizeof(struct dell_bios_data_token) * 2);
183         dmi_walk(find_micmute_tokens, NULL);
184
185         return 0;
186 }
187
188 struct bios_args {
189         unsigned char length;
190         unsigned char result_code;
191         unsigned char device_id;
192         unsigned char command;
193         unsigned char on_time;
194         unsigned char off_time;
195 };
196
197 static int dell_led_perform_fn(u8 length,
198                 u8 result_code,
199                 u8 device_id,
200                 u8 command,
201                 u8 on_time,
202                 u8 off_time)
203 {
204         struct bios_args *bios_return;
205         u8 return_code;
206         union acpi_object *obj;
207         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
208         struct acpi_buffer input;
209         acpi_status status;
210
211         struct bios_args args;
212         args.length = length;
213         args.result_code = result_code;
214         args.device_id = device_id;
215         args.command = command;
216         args.on_time = on_time;
217         args.off_time = off_time;
218
219         input.length = sizeof(struct bios_args);
220         input.pointer = &args;
221
222         status = wmi_evaluate_method(DELL_LED_BIOS_GUID,
223                 1,
224                 1,
225                 &input,
226                 &output);
227
228         if (ACPI_FAILURE(status))
229                 return status;
230
231         obj = output.pointer;
232
233         if (!obj)
234                 return -EINVAL;
235         else if (obj->type != ACPI_TYPE_BUFFER) {
236                 kfree(obj);
237                 return -EINVAL;
238         }
239
240         bios_return = ((struct bios_args *)obj->buffer.pointer);
241         return_code = bios_return->result_code;
242
243         kfree(obj);
244
245         return return_code;
246 }
247
248 static int led_on(void)
249 {
250         return dell_led_perform_fn(3,   /* Length of command */
251                 INTERFACE_ERROR,        /* Init to  INTERFACE_ERROR */
252                 DEVICE_ID_PANEL_BACK,   /* Device ID */
253                 CMD_LED_ON,             /* Command */
254                 0,                      /* not used */
255                 0);                     /* not used */
256 }
257
258 static int led_off(void)
259 {
260         return dell_led_perform_fn(3,   /* Length of command */
261                 INTERFACE_ERROR,        /* Init to  INTERFACE_ERROR */
262                 DEVICE_ID_PANEL_BACK,   /* Device ID */
263                 CMD_LED_OFF,            /* Command */
264                 0,                      /* not used */
265                 0);                     /* not used */
266 }
267
268 static int led_blink(unsigned char on_eighths,
269                 unsigned char off_eighths)
270 {
271         return dell_led_perform_fn(5,   /* Length of command */
272                 INTERFACE_ERROR,        /* Init to  INTERFACE_ERROR */
273                 DEVICE_ID_PANEL_BACK,   /* Device ID */
274                 CMD_LED_BLINK,          /* Command */
275                 on_eighths,             /* blink on in eigths of a second */
276                 off_eighths);           /* blink off in eights of a second */
277 }
278
279 static void dell_led_set(struct led_classdev *led_cdev,
280                 enum led_brightness value)
281 {
282         if (value == LED_OFF)
283                 led_off();
284         else
285                 led_on();
286 }
287
288 static int dell_led_blink(struct led_classdev *led_cdev,
289                 unsigned long *delay_on,
290                 unsigned long *delay_off)
291 {
292         unsigned long on_eighths;
293         unsigned long off_eighths;
294
295         /* The Dell LED delay is based on 125ms intervals.
296            Need to round up to next interval. */
297
298         on_eighths = (*delay_on + 124) / 125;
299         if (0 == on_eighths)
300                 on_eighths = 1;
301         if (on_eighths > 255)
302                 on_eighths = 255;
303         *delay_on = on_eighths * 125;
304
305         off_eighths = (*delay_off + 124) / 125;
306         if (0 == off_eighths)
307                 off_eighths = 1;
308         if (off_eighths > 255)
309                 off_eighths = 255;
310         *delay_off = off_eighths * 125;
311
312         led_blink(on_eighths, off_eighths);
313
314         return 0;
315 }
316
317 static struct led_classdev dell_led = {
318         .name           = "dell::lid",
319         .brightness     = LED_OFF,
320         .max_brightness = 1,
321         .brightness_set = dell_led_set,
322         .blink_set      = dell_led_blink,
323         .flags          = LED_CORE_SUSPENDRESUME,
324 };
325
326 static int __init dell_led_init(void)
327 {
328         int error = 0;
329
330         if (!wmi_has_guid(DELL_LED_BIOS_GUID) && !wmi_has_guid(DELL_APP_GUID))
331                 return -ENODEV;
332
333         if (wmi_has_guid(DELL_APP_GUID))
334                 error = dell_micmute_led_init();
335
336         if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
337                 error = led_off();
338                 if (error != 0)
339                         return -ENODEV;
340
341                 error = led_classdev_register(NULL, &dell_led);
342         }
343
344         return error;
345 }
346
347 static void __exit dell_led_exit(void)
348 {
349         int error = 0;
350
351         if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
352                 error = led_off();
353                 if (error == 0)
354                         led_classdev_unregister(&dell_led);
355         }
356 }
357
358 module_init(dell_led_init);
359 module_exit(dell_led_exit);