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72dcd8d0 BR |
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> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
54f4dedb | 17 | #include <linux/module.h> |
db6d8cc0 AH |
18 | #include <linux/dmi.h> |
19 | #include <linux/dell-led.h> | |
72dcd8d0 BR |
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" | |
db6d8cc0 | 26 | #define DELL_APP_GUID "A80593CE-A997-11DA-B012-B622A1EF5492" |
72dcd8d0 BR |
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 | ||
db6d8cc0 AH |
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 | ||
72dcd8d0 BR |
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 | ||
db6d8cc0 | 330 | if (!wmi_has_guid(DELL_LED_BIOS_GUID) && !wmi_has_guid(DELL_APP_GUID)) |
72dcd8d0 BR |
331 | return -ENODEV; |
332 | ||
db6d8cc0 AH |
333 | if (wmi_has_guid(DELL_APP_GUID)) |
334 | error = dell_micmute_led_init(); | |
72dcd8d0 | 335 | |
db6d8cc0 AH |
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; | |
72dcd8d0 BR |
345 | } |
346 | ||
347 | static void __exit dell_led_exit(void) | |
348 | { | |
db6d8cc0 | 349 | int error = 0; |
72dcd8d0 | 350 | |
db6d8cc0 AH |
351 | if (wmi_has_guid(DELL_LED_BIOS_GUID)) { |
352 | error = led_off(); | |
353 | if (error == 0) | |
354 | led_classdev_unregister(&dell_led); | |
355 | } | |
72dcd8d0 BR |
356 | } |
357 | ||
358 | module_init(dell_led_init); | |
359 | module_exit(dell_led_exit); |