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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> | |
cf0d7ea3 | 20 | #include "../platform/x86/dell-smbios.h" |
72dcd8d0 BR |
21 | |
22 | MODULE_AUTHOR("Louis Davis/Jim Dailey"); | |
23 | MODULE_DESCRIPTION("Dell LED Control Driver"); | |
24 | MODULE_LICENSE("GPL"); | |
25 | ||
26 | #define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396" | |
db6d8cc0 | 27 | #define DELL_APP_GUID "A80593CE-A997-11DA-B012-B622A1EF5492" |
72dcd8d0 BR |
28 | MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID); |
29 | ||
30 | /* Error Result Codes: */ | |
31 | #define INVALID_DEVICE_ID 250 | |
32 | #define INVALID_PARAMETER 251 | |
33 | #define INVALID_BUFFER 252 | |
34 | #define INTERFACE_ERROR 253 | |
35 | #define UNSUPPORTED_COMMAND 254 | |
36 | #define UNSPECIFIED_ERROR 255 | |
37 | ||
38 | /* Device ID */ | |
39 | #define DEVICE_ID_PANEL_BACK 1 | |
40 | ||
41 | /* LED Commands */ | |
42 | #define CMD_LED_ON 16 | |
43 | #define CMD_LED_OFF 17 | |
44 | #define CMD_LED_BLINK 18 | |
45 | ||
db6d8cc0 AH |
46 | #define GLOBAL_MIC_MUTE_ENABLE 0x364 |
47 | #define GLOBAL_MIC_MUTE_DISABLE 0x365 | |
48 | ||
db6d8cc0 AH |
49 | static int dell_micmute_led_set(int state) |
50 | { | |
0c41a08e | 51 | struct calling_interface_buffer *buffer; |
cf0d7ea3 | 52 | struct calling_interface_token *token; |
db6d8cc0 AH |
53 | |
54 | if (!wmi_has_guid(DELL_APP_GUID)) | |
55 | return -ENODEV; | |
56 | ||
cf0d7ea3 MK |
57 | if (state == 0) |
58 | token = dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE); | |
59 | else if (state == 1) | |
60 | token = dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE); | |
db6d8cc0 AH |
61 | else |
62 | return -EINVAL; | |
63 | ||
cf0d7ea3 MK |
64 | if (!token) |
65 | return -ENODEV; | |
66 | ||
0c41a08e MK |
67 | buffer = dell_smbios_get_buffer(); |
68 | buffer->input[0] = token->location; | |
69 | buffer->input[1] = token->value; | |
70 | dell_smbios_send_request(1, 0); | |
71 | dell_smbios_release_buffer(); | |
db6d8cc0 AH |
72 | |
73 | return state; | |
74 | } | |
75 | ||
76 | int dell_app_wmi_led_set(int whichled, int on) | |
77 | { | |
78 | int state = 0; | |
79 | ||
80 | switch (whichled) { | |
81 | case DELL_LED_MICMUTE: | |
82 | state = dell_micmute_led_set(on); | |
83 | break; | |
84 | default: | |
85 | pr_warn("led type %x is not supported\n", whichled); | |
86 | break; | |
87 | } | |
88 | ||
89 | return state; | |
90 | } | |
91 | EXPORT_SYMBOL_GPL(dell_app_wmi_led_set); | |
92 | ||
72dcd8d0 BR |
93 | struct bios_args { |
94 | unsigned char length; | |
95 | unsigned char result_code; | |
96 | unsigned char device_id; | |
97 | unsigned char command; | |
98 | unsigned char on_time; | |
99 | unsigned char off_time; | |
100 | }; | |
101 | ||
102 | static int dell_led_perform_fn(u8 length, | |
103 | u8 result_code, | |
104 | u8 device_id, | |
105 | u8 command, | |
106 | u8 on_time, | |
107 | u8 off_time) | |
108 | { | |
109 | struct bios_args *bios_return; | |
110 | u8 return_code; | |
111 | union acpi_object *obj; | |
112 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; | |
113 | struct acpi_buffer input; | |
114 | acpi_status status; | |
115 | ||
116 | struct bios_args args; | |
117 | args.length = length; | |
118 | args.result_code = result_code; | |
119 | args.device_id = device_id; | |
120 | args.command = command; | |
121 | args.on_time = on_time; | |
122 | args.off_time = off_time; | |
123 | ||
124 | input.length = sizeof(struct bios_args); | |
125 | input.pointer = &args; | |
126 | ||
127 | status = wmi_evaluate_method(DELL_LED_BIOS_GUID, | |
128 | 1, | |
129 | 1, | |
130 | &input, | |
131 | &output); | |
132 | ||
133 | if (ACPI_FAILURE(status)) | |
134 | return status; | |
135 | ||
136 | obj = output.pointer; | |
137 | ||
138 | if (!obj) | |
139 | return -EINVAL; | |
140 | else if (obj->type != ACPI_TYPE_BUFFER) { | |
141 | kfree(obj); | |
142 | return -EINVAL; | |
143 | } | |
144 | ||
145 | bios_return = ((struct bios_args *)obj->buffer.pointer); | |
146 | return_code = bios_return->result_code; | |
147 | ||
148 | kfree(obj); | |
149 | ||
150 | return return_code; | |
151 | } | |
152 | ||
153 | static int led_on(void) | |
154 | { | |
155 | return dell_led_perform_fn(3, /* Length of command */ | |
156 | INTERFACE_ERROR, /* Init to INTERFACE_ERROR */ | |
157 | DEVICE_ID_PANEL_BACK, /* Device ID */ | |
158 | CMD_LED_ON, /* Command */ | |
159 | 0, /* not used */ | |
160 | 0); /* not used */ | |
161 | } | |
162 | ||
163 | static int led_off(void) | |
164 | { | |
165 | return dell_led_perform_fn(3, /* Length of command */ | |
166 | INTERFACE_ERROR, /* Init to INTERFACE_ERROR */ | |
167 | DEVICE_ID_PANEL_BACK, /* Device ID */ | |
168 | CMD_LED_OFF, /* Command */ | |
169 | 0, /* not used */ | |
170 | 0); /* not used */ | |
171 | } | |
172 | ||
173 | static int led_blink(unsigned char on_eighths, | |
174 | unsigned char off_eighths) | |
175 | { | |
176 | return dell_led_perform_fn(5, /* Length of command */ | |
177 | INTERFACE_ERROR, /* Init to INTERFACE_ERROR */ | |
178 | DEVICE_ID_PANEL_BACK, /* Device ID */ | |
179 | CMD_LED_BLINK, /* Command */ | |
180 | on_eighths, /* blink on in eigths of a second */ | |
181 | off_eighths); /* blink off in eights of a second */ | |
182 | } | |
183 | ||
184 | static void dell_led_set(struct led_classdev *led_cdev, | |
185 | enum led_brightness value) | |
186 | { | |
187 | if (value == LED_OFF) | |
188 | led_off(); | |
189 | else | |
190 | led_on(); | |
191 | } | |
192 | ||
193 | static int dell_led_blink(struct led_classdev *led_cdev, | |
194 | unsigned long *delay_on, | |
195 | unsigned long *delay_off) | |
196 | { | |
197 | unsigned long on_eighths; | |
198 | unsigned long off_eighths; | |
199 | ||
200 | /* The Dell LED delay is based on 125ms intervals. | |
201 | Need to round up to next interval. */ | |
202 | ||
203 | on_eighths = (*delay_on + 124) / 125; | |
204 | if (0 == on_eighths) | |
205 | on_eighths = 1; | |
206 | if (on_eighths > 255) | |
207 | on_eighths = 255; | |
208 | *delay_on = on_eighths * 125; | |
209 | ||
210 | off_eighths = (*delay_off + 124) / 125; | |
211 | if (0 == off_eighths) | |
212 | off_eighths = 1; | |
213 | if (off_eighths > 255) | |
214 | off_eighths = 255; | |
215 | *delay_off = off_eighths * 125; | |
216 | ||
217 | led_blink(on_eighths, off_eighths); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static struct led_classdev dell_led = { | |
223 | .name = "dell::lid", | |
224 | .brightness = LED_OFF, | |
225 | .max_brightness = 1, | |
226 | .brightness_set = dell_led_set, | |
227 | .blink_set = dell_led_blink, | |
228 | .flags = LED_CORE_SUSPENDRESUME, | |
229 | }; | |
230 | ||
231 | static int __init dell_led_init(void) | |
232 | { | |
233 | int error = 0; | |
234 | ||
db6d8cc0 | 235 | if (!wmi_has_guid(DELL_LED_BIOS_GUID) && !wmi_has_guid(DELL_APP_GUID)) |
72dcd8d0 BR |
236 | return -ENODEV; |
237 | ||
db6d8cc0 AH |
238 | if (wmi_has_guid(DELL_LED_BIOS_GUID)) { |
239 | error = led_off(); | |
240 | if (error != 0) | |
241 | return -ENODEV; | |
242 | ||
243 | error = led_classdev_register(NULL, &dell_led); | |
244 | } | |
245 | ||
246 | return error; | |
72dcd8d0 BR |
247 | } |
248 | ||
249 | static void __exit dell_led_exit(void) | |
250 | { | |
db6d8cc0 | 251 | int error = 0; |
72dcd8d0 | 252 | |
db6d8cc0 AH |
253 | if (wmi_has_guid(DELL_LED_BIOS_GUID)) { |
254 | error = led_off(); | |
255 | if (error == 0) | |
256 | led_classdev_unregister(&dell_led); | |
257 | } | |
72dcd8d0 BR |
258 | } |
259 | ||
260 | module_init(dell_led_init); | |
261 | module_exit(dell_led_exit); |