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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 | |
19 | MODULE_AUTHOR("Louis Davis/Jim Dailey"); |
20 | MODULE_DESCRIPTION("Dell LED Control Driver"); |
21 | MODULE_LICENSE("GPL"); |
22 | |
23 | #define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396" |
24 | MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID); |
25 | |
26 | /* Error Result Codes: */ |
27 | #define INVALID_DEVICE_ID 250 |
28 | #define INVALID_PARAMETER 251 |
29 | #define INVALID_BUFFER 252 |
30 | #define INTERFACE_ERROR 253 |
31 | #define UNSUPPORTED_COMMAND 254 |
32 | #define UNSPECIFIED_ERROR 255 |
33 | |
34 | /* Device ID */ |
35 | #define DEVICE_ID_PANEL_BACK 1 |
36 | |
37 | /* LED Commands */ |
38 | #define CMD_LED_ON 16 |
39 | #define CMD_LED_OFF 17 |
40 | #define CMD_LED_BLINK 18 |
41 | |
42 | struct bios_args { |
43 | unsigned char length; |
44 | unsigned char result_code; |
45 | unsigned char device_id; |
46 | unsigned char command; |
47 | unsigned char on_time; |
48 | unsigned char off_time; |
49 | }; |
50 | |
51 | static int dell_led_perform_fn(u8 length, |
52 | u8 result_code, |
53 | u8 device_id, |
54 | u8 command, |
55 | u8 on_time, |
56 | u8 off_time) |
57 | { |
58 | struct bios_args *bios_return; |
59 | u8 return_code; |
60 | union acpi_object *obj; |
61 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; |
62 | struct acpi_buffer input; |
63 | acpi_status status; |
64 | |
65 | struct bios_args args; |
66 | args.length = length; |
67 | args.result_code = result_code; |
68 | args.device_id = device_id; |
69 | args.command = command; |
70 | args.on_time = on_time; |
71 | args.off_time = off_time; |
72 | |
73 | input.length = sizeof(struct bios_args); |
74 | input.pointer = &args; |
75 | |
76 | status = wmi_evaluate_method(DELL_LED_BIOS_GUID, |
77 | 1, |
78 | 1, |
79 | &input, |
80 | &output); |
81 | |
82 | if (ACPI_FAILURE(status)) |
83 | return status; |
84 | |
85 | obj = output.pointer; |
86 | |
87 | if (!obj) |
88 | return -EINVAL; |
89 | else if (obj->type != ACPI_TYPE_BUFFER) { |
90 | kfree(obj); |
91 | return -EINVAL; |
92 | } |
93 | |
94 | bios_return = ((struct bios_args *)obj->buffer.pointer); |
95 | return_code = bios_return->result_code; |
96 | |
97 | kfree(obj); |
98 | |
99 | return return_code; |
100 | } |
101 | |
102 | static int led_on(void) |
103 | { |
104 | return dell_led_perform_fn(3, /* Length of command */ |
105 | INTERFACE_ERROR, /* Init to INTERFACE_ERROR */ |
106 | DEVICE_ID_PANEL_BACK, /* Device ID */ |
107 | CMD_LED_ON, /* Command */ |
108 | 0, /* not used */ |
109 | 0); /* not used */ |
110 | } |
111 | |
112 | static int led_off(void) |
113 | { |
114 | return dell_led_perform_fn(3, /* Length of command */ |
115 | INTERFACE_ERROR, /* Init to INTERFACE_ERROR */ |
116 | DEVICE_ID_PANEL_BACK, /* Device ID */ |
117 | CMD_LED_OFF, /* Command */ |
118 | 0, /* not used */ |
119 | 0); /* not used */ |
120 | } |
121 | |
122 | static int led_blink(unsigned char on_eighths, |
123 | unsigned char off_eighths) |
124 | { |
125 | return dell_led_perform_fn(5, /* Length of command */ |
126 | INTERFACE_ERROR, /* Init to INTERFACE_ERROR */ |
127 | DEVICE_ID_PANEL_BACK, /* Device ID */ |
128 | CMD_LED_BLINK, /* Command */ |
129 | on_eighths, /* blink on in eigths of a second */ |
130 | off_eighths); /* blink off in eights of a second */ |
131 | } |
132 | |
133 | static void dell_led_set(struct led_classdev *led_cdev, |
134 | enum led_brightness value) |
135 | { |
136 | if (value == LED_OFF) |
137 | led_off(); |
138 | else |
139 | led_on(); |
140 | } |
141 | |
142 | static int dell_led_blink(struct led_classdev *led_cdev, |
143 | unsigned long *delay_on, |
144 | unsigned long *delay_off) |
145 | { |
146 | unsigned long on_eighths; |
147 | unsigned long off_eighths; |
148 | |
149 | /* The Dell LED delay is based on 125ms intervals. |
150 | Need to round up to next interval. */ |
151 | |
152 | on_eighths = (*delay_on + 124) / 125; |
153 | if (0 == on_eighths) |
154 | on_eighths = 1; |
155 | if (on_eighths > 255) |
156 | on_eighths = 255; |
157 | *delay_on = on_eighths * 125; |
158 | |
159 | off_eighths = (*delay_off + 124) / 125; |
160 | if (0 == off_eighths) |
161 | off_eighths = 1; |
162 | if (off_eighths > 255) |
163 | off_eighths = 255; |
164 | *delay_off = off_eighths * 125; |
165 | |
166 | led_blink(on_eighths, off_eighths); |
167 | |
168 | return 0; |
169 | } |
170 | |
171 | static struct led_classdev dell_led = { |
172 | .name = "dell::lid", |
173 | .brightness = LED_OFF, |
174 | .max_brightness = 1, |
175 | .brightness_set = dell_led_set, |
176 | .blink_set = dell_led_blink, |
177 | .flags = LED_CORE_SUSPENDRESUME, |
178 | }; |
179 | |
180 | static int __init dell_led_init(void) |
181 | { |
182 | int error = 0; |
183 | |
184 | if (!wmi_has_guid(DELL_LED_BIOS_GUID)) |
185 | return -ENODEV; |
186 | |
187 | error = led_off(); |
188 | if (error != 0) |
189 | return -ENODEV; |
190 | |
191 | return led_classdev_register(NULL, &dell_led); |
192 | } |
193 | |
194 | static void __exit dell_led_exit(void) |
195 | { |
196 | led_classdev_unregister(&dell_led); |
197 | |
198 | led_off(); |
199 | } |
200 | |
201 | module_init(dell_led_init); |
202 | module_exit(dell_led_exit); |
203 |
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