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 #include "../platform/x86/dell-smbios.h"
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"
27 #define DELL_APP_GUID "A80593CE-A997-11DA-B012-B622A1EF5492"
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
46 #define GLOBAL_MIC_MUTE_ENABLE 0x364
47 #define GLOBAL_MIC_MUTE_DISABLE 0x365
48
dell_micmute_led_set(int state)49 static int dell_micmute_led_set(int state)
50 {
51 struct calling_interface_buffer *buffer;
52 struct calling_interface_token *token;
53
54 if (!wmi_has_guid(DELL_APP_GUID))
55 return -ENODEV;
56
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);
61 else
62 return -EINVAL;
63
64 if (!token)
65 return -ENODEV;
66
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();
72
73 return state;
74 }
75
dell_app_wmi_led_set(int whichled,int on)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
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
dell_led_perform_fn(u8 length,u8 result_code,u8 device_id,u8 command,u8 on_time,u8 off_time)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
led_on(void)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
led_off(void)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
led_blink(unsigned char on_eighths,unsigned char off_eighths)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
dell_led_set(struct led_classdev * led_cdev,enum led_brightness value)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
dell_led_blink(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)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
dell_led_init(void)231 static int __init dell_led_init(void)
232 {
233 int error = 0;
234
235 if (!wmi_has_guid(DELL_LED_BIOS_GUID) && !wmi_has_guid(DELL_APP_GUID))
236 return -ENODEV;
237
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;
247 }
248
dell_led_exit(void)249 static void __exit dell_led_exit(void)
250 {
251 int error = 0;
252
253 if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
254 error = led_off();
255 if (error == 0)
256 led_classdev_unregister(&dell_led);
257 }
258 }
259
260 module_init(dell_led_init);
261 module_exit(dell_led_exit);
262