2 * dell_led.c - Dell LED Driver
4 * Copyright (C) 2010 Dell Inc.
5 * Louis Davis <louis_davis@dell.com>
6 * Jim Dailey <jim_dailey@dell.com>
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.
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"
22 MODULE_AUTHOR("Louis Davis/Jim Dailey");
23 MODULE_DESCRIPTION("Dell LED Control Driver");
24 MODULE_LICENSE("GPL");
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);
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
39 #define DEVICE_ID_PANEL_BACK 1
43 #define CMD_LED_OFF 17
44 #define CMD_LED_BLINK 18
60 #define GLOBAL_MIC_MUTE_ENABLE 0x364
61 #define GLOBAL_MIC_MUTE_DISABLE 0x365
63 static int dell_wmi_perform_query(struct app_wmi_args *args)
65 struct app_wmi_args *bios_return;
66 union acpi_object *obj;
67 struct acpi_buffer input;
68 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
75 status = wmi_evaluate_method(DELL_APP_GUID, 0, 1, &input, &output);
76 if (!ACPI_SUCCESS(status))
83 if (obj->type != ACPI_TYPE_BUFFER)
86 bios_return = (struct app_wmi_args *)obj->buffer.pointer;
87 rc = bios_return->res1;
91 memcpy(args, bios_return, sizeof(struct app_wmi_args));
100 static int dell_micmute_led_set(int state)
102 struct calling_interface_token *token;
103 struct app_wmi_args args;
105 if (!wmi_has_guid(DELL_APP_GUID))
109 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_DISABLE);
111 token = dell_smbios_find_token(GLOBAL_MIC_MUTE_ENABLE);
118 memset(&args, 0, sizeof(struct app_wmi_args));
121 args.arg1 = token->location;
122 args.arg2 = token->value;
124 dell_wmi_perform_query(&args);
129 int dell_app_wmi_led_set(int whichled, int on)
134 case DELL_LED_MICMUTE:
135 state = dell_micmute_led_set(on);
138 pr_warn("led type %x is not supported\n", whichled);
144 EXPORT_SYMBOL_GPL(dell_app_wmi_led_set);
147 unsigned char length;
148 unsigned char result_code;
149 unsigned char device_id;
150 unsigned char command;
151 unsigned char on_time;
152 unsigned char off_time;
155 static int dell_led_perform_fn(u8 length,
162 struct bios_args *bios_return;
164 union acpi_object *obj;
165 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
166 struct acpi_buffer input;
169 struct bios_args args;
170 args.length = length;
171 args.result_code = result_code;
172 args.device_id = device_id;
173 args.command = command;
174 args.on_time = on_time;
175 args.off_time = off_time;
177 input.length = sizeof(struct bios_args);
178 input.pointer = &args;
180 status = wmi_evaluate_method(DELL_LED_BIOS_GUID,
186 if (ACPI_FAILURE(status))
189 obj = output.pointer;
193 else if (obj->type != ACPI_TYPE_BUFFER) {
198 bios_return = ((struct bios_args *)obj->buffer.pointer);
199 return_code = bios_return->result_code;
206 static int led_on(void)
208 return dell_led_perform_fn(3, /* Length of command */
209 INTERFACE_ERROR, /* Init to INTERFACE_ERROR */
210 DEVICE_ID_PANEL_BACK, /* Device ID */
211 CMD_LED_ON, /* Command */
216 static int led_off(void)
218 return dell_led_perform_fn(3, /* Length of command */
219 INTERFACE_ERROR, /* Init to INTERFACE_ERROR */
220 DEVICE_ID_PANEL_BACK, /* Device ID */
221 CMD_LED_OFF, /* Command */
226 static int led_blink(unsigned char on_eighths,
227 unsigned char off_eighths)
229 return dell_led_perform_fn(5, /* Length of command */
230 INTERFACE_ERROR, /* Init to INTERFACE_ERROR */
231 DEVICE_ID_PANEL_BACK, /* Device ID */
232 CMD_LED_BLINK, /* Command */
233 on_eighths, /* blink on in eigths of a second */
234 off_eighths); /* blink off in eights of a second */
237 static void dell_led_set(struct led_classdev *led_cdev,
238 enum led_brightness value)
240 if (value == LED_OFF)
246 static int dell_led_blink(struct led_classdev *led_cdev,
247 unsigned long *delay_on,
248 unsigned long *delay_off)
250 unsigned long on_eighths;
251 unsigned long off_eighths;
253 /* The Dell LED delay is based on 125ms intervals.
254 Need to round up to next interval. */
256 on_eighths = (*delay_on + 124) / 125;
259 if (on_eighths > 255)
261 *delay_on = on_eighths * 125;
263 off_eighths = (*delay_off + 124) / 125;
264 if (0 == off_eighths)
266 if (off_eighths > 255)
268 *delay_off = off_eighths * 125;
270 led_blink(on_eighths, off_eighths);
275 static struct led_classdev dell_led = {
277 .brightness = LED_OFF,
279 .brightness_set = dell_led_set,
280 .blink_set = dell_led_blink,
281 .flags = LED_CORE_SUSPENDRESUME,
284 static int __init dell_led_init(void)
288 if (!wmi_has_guid(DELL_LED_BIOS_GUID) && !wmi_has_guid(DELL_APP_GUID))
291 if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
296 error = led_classdev_register(NULL, &dell_led);
302 static void __exit dell_led_exit(void)
306 if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
309 led_classdev_unregister(&dell_led);
313 module_init(dell_led_init);
314 module_exit(dell_led_exit);