1*f1e1ea51SMario Limonciello /*
2*f1e1ea51SMario Limonciello * Copyright (C) 2010 Dell Inc.
3*f1e1ea51SMario Limonciello * Louis Davis <louis_davis@dell.com>
4*f1e1ea51SMario Limonciello * Jim Dailey <jim_dailey@dell.com>
5*f1e1ea51SMario Limonciello *
6*f1e1ea51SMario Limonciello * This program is free software; you can redistribute it and/or modify
7*f1e1ea51SMario Limonciello * it under the terms of the GNU General Public License as
8*f1e1ea51SMario Limonciello * published by the Free Software Foundation.
9*f1e1ea51SMario Limonciello *
10*f1e1ea51SMario Limonciello */
11*f1e1ea51SMario Limonciello
12*f1e1ea51SMario Limonciello #include <linux/acpi.h>
13*f1e1ea51SMario Limonciello #include <linux/leds.h>
14*f1e1ea51SMario Limonciello #include <linux/slab.h>
15*f1e1ea51SMario Limonciello #include <linux/module.h>
16*f1e1ea51SMario Limonciello
17*f1e1ea51SMario Limonciello MODULE_AUTHOR("Louis Davis/Jim Dailey");
18*f1e1ea51SMario Limonciello MODULE_DESCRIPTION("Dell LED Control Driver");
19*f1e1ea51SMario Limonciello MODULE_LICENSE("GPL");
20*f1e1ea51SMario Limonciello
21*f1e1ea51SMario Limonciello #define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396"
22*f1e1ea51SMario Limonciello MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID);
23*f1e1ea51SMario Limonciello
24*f1e1ea51SMario Limonciello /* Error Result Codes: */
25*f1e1ea51SMario Limonciello #define INVALID_DEVICE_ID 250
26*f1e1ea51SMario Limonciello #define INVALID_PARAMETER 251
27*f1e1ea51SMario Limonciello #define INVALID_BUFFER 252
28*f1e1ea51SMario Limonciello #define INTERFACE_ERROR 253
29*f1e1ea51SMario Limonciello #define UNSUPPORTED_COMMAND 254
30*f1e1ea51SMario Limonciello #define UNSPECIFIED_ERROR 255
31*f1e1ea51SMario Limonciello
32*f1e1ea51SMario Limonciello /* Device ID */
33*f1e1ea51SMario Limonciello #define DEVICE_ID_PANEL_BACK 1
34*f1e1ea51SMario Limonciello
35*f1e1ea51SMario Limonciello /* LED Commands */
36*f1e1ea51SMario Limonciello #define CMD_LED_ON 16
37*f1e1ea51SMario Limonciello #define CMD_LED_OFF 17
38*f1e1ea51SMario Limonciello #define CMD_LED_BLINK 18
39*f1e1ea51SMario Limonciello
40*f1e1ea51SMario Limonciello struct bios_args {
41*f1e1ea51SMario Limonciello unsigned char length;
42*f1e1ea51SMario Limonciello unsigned char result_code;
43*f1e1ea51SMario Limonciello unsigned char device_id;
44*f1e1ea51SMario Limonciello unsigned char command;
45*f1e1ea51SMario Limonciello unsigned char on_time;
46*f1e1ea51SMario Limonciello unsigned char off_time;
47*f1e1ea51SMario Limonciello };
48*f1e1ea51SMario Limonciello
dell_led_perform_fn(u8 length,u8 result_code,u8 device_id,u8 command,u8 on_time,u8 off_time)49*f1e1ea51SMario Limonciello static int dell_led_perform_fn(u8 length, u8 result_code, u8 device_id,
50*f1e1ea51SMario Limonciello u8 command, u8 on_time, u8 off_time)
51*f1e1ea51SMario Limonciello {
52*f1e1ea51SMario Limonciello struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
53*f1e1ea51SMario Limonciello struct bios_args *bios_return;
54*f1e1ea51SMario Limonciello struct acpi_buffer input;
55*f1e1ea51SMario Limonciello union acpi_object *obj;
56*f1e1ea51SMario Limonciello acpi_status status;
57*f1e1ea51SMario Limonciello u8 return_code;
58*f1e1ea51SMario Limonciello
59*f1e1ea51SMario Limonciello struct bios_args args = {
60*f1e1ea51SMario Limonciello .length = length,
61*f1e1ea51SMario Limonciello .result_code = result_code,
62*f1e1ea51SMario Limonciello .device_id = device_id,
63*f1e1ea51SMario Limonciello .command = command,
64*f1e1ea51SMario Limonciello .on_time = on_time,
65*f1e1ea51SMario Limonciello .off_time = off_time
66*f1e1ea51SMario Limonciello };
67*f1e1ea51SMario Limonciello
68*f1e1ea51SMario Limonciello input.length = sizeof(struct bios_args);
69*f1e1ea51SMario Limonciello input.pointer = &args;
70*f1e1ea51SMario Limonciello
71*f1e1ea51SMario Limonciello status = wmi_evaluate_method(DELL_LED_BIOS_GUID, 0, 1, &input, &output);
72*f1e1ea51SMario Limonciello if (ACPI_FAILURE(status))
73*f1e1ea51SMario Limonciello return status;
74*f1e1ea51SMario Limonciello
75*f1e1ea51SMario Limonciello obj = output.pointer;
76*f1e1ea51SMario Limonciello
77*f1e1ea51SMario Limonciello if (!obj)
78*f1e1ea51SMario Limonciello return -EINVAL;
79*f1e1ea51SMario Limonciello if (obj->type != ACPI_TYPE_BUFFER) {
80*f1e1ea51SMario Limonciello kfree(obj);
81*f1e1ea51SMario Limonciello return -EINVAL;
82*f1e1ea51SMario Limonciello }
83*f1e1ea51SMario Limonciello
84*f1e1ea51SMario Limonciello bios_return = ((struct bios_args *)obj->buffer.pointer);
85*f1e1ea51SMario Limonciello return_code = bios_return->result_code;
86*f1e1ea51SMario Limonciello
87*f1e1ea51SMario Limonciello kfree(obj);
88*f1e1ea51SMario Limonciello
89*f1e1ea51SMario Limonciello return return_code;
90*f1e1ea51SMario Limonciello }
91*f1e1ea51SMario Limonciello
led_on(void)92*f1e1ea51SMario Limonciello static int led_on(void)
93*f1e1ea51SMario Limonciello {
94*f1e1ea51SMario Limonciello return dell_led_perform_fn(3, /* Length of command */
95*f1e1ea51SMario Limonciello INTERFACE_ERROR, /* Init to INTERFACE_ERROR */
96*f1e1ea51SMario Limonciello DEVICE_ID_PANEL_BACK, /* Device ID */
97*f1e1ea51SMario Limonciello CMD_LED_ON, /* Command */
98*f1e1ea51SMario Limonciello 0, /* not used */
99*f1e1ea51SMario Limonciello 0); /* not used */
100*f1e1ea51SMario Limonciello }
101*f1e1ea51SMario Limonciello
led_off(void)102*f1e1ea51SMario Limonciello static int led_off(void)
103*f1e1ea51SMario Limonciello {
104*f1e1ea51SMario Limonciello return dell_led_perform_fn(3, /* Length of command */
105*f1e1ea51SMario Limonciello INTERFACE_ERROR, /* Init to INTERFACE_ERROR */
106*f1e1ea51SMario Limonciello DEVICE_ID_PANEL_BACK, /* Device ID */
107*f1e1ea51SMario Limonciello CMD_LED_OFF, /* Command */
108*f1e1ea51SMario Limonciello 0, /* not used */
109*f1e1ea51SMario Limonciello 0); /* not used */
110*f1e1ea51SMario Limonciello }
111*f1e1ea51SMario Limonciello
led_blink(unsigned char on_eighths,unsigned char off_eighths)112*f1e1ea51SMario Limonciello static int led_blink(unsigned char on_eighths, unsigned char off_eighths)
113*f1e1ea51SMario Limonciello {
114*f1e1ea51SMario Limonciello return dell_led_perform_fn(5, /* Length of command */
115*f1e1ea51SMario Limonciello INTERFACE_ERROR, /* Init to INTERFACE_ERROR */
116*f1e1ea51SMario Limonciello DEVICE_ID_PANEL_BACK, /* Device ID */
117*f1e1ea51SMario Limonciello CMD_LED_BLINK, /* Command */
118*f1e1ea51SMario Limonciello on_eighths, /* blink on in eigths of a second */
119*f1e1ea51SMario Limonciello off_eighths); /* blink off in eights of a second */
120*f1e1ea51SMario Limonciello }
121*f1e1ea51SMario Limonciello
dell_led_set(struct led_classdev * led_cdev,enum led_brightness value)122*f1e1ea51SMario Limonciello static void dell_led_set(struct led_classdev *led_cdev,
123*f1e1ea51SMario Limonciello enum led_brightness value)
124*f1e1ea51SMario Limonciello {
125*f1e1ea51SMario Limonciello if (value == LED_OFF)
126*f1e1ea51SMario Limonciello led_off();
127*f1e1ea51SMario Limonciello else
128*f1e1ea51SMario Limonciello led_on();
129*f1e1ea51SMario Limonciello }
130*f1e1ea51SMario Limonciello
dell_led_blink(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)131*f1e1ea51SMario Limonciello static int dell_led_blink(struct led_classdev *led_cdev,
132*f1e1ea51SMario Limonciello unsigned long *delay_on, unsigned long *delay_off)
133*f1e1ea51SMario Limonciello {
134*f1e1ea51SMario Limonciello unsigned long on_eighths;
135*f1e1ea51SMario Limonciello unsigned long off_eighths;
136*f1e1ea51SMario Limonciello
137*f1e1ea51SMario Limonciello /*
138*f1e1ea51SMario Limonciello * The Dell LED delay is based on 125ms intervals.
139*f1e1ea51SMario Limonciello * Need to round up to next interval.
140*f1e1ea51SMario Limonciello */
141*f1e1ea51SMario Limonciello
142*f1e1ea51SMario Limonciello on_eighths = DIV_ROUND_UP(*delay_on, 125);
143*f1e1ea51SMario Limonciello on_eighths = clamp_t(unsigned long, on_eighths, 1, 255);
144*f1e1ea51SMario Limonciello *delay_on = on_eighths * 125;
145*f1e1ea51SMario Limonciello
146*f1e1ea51SMario Limonciello off_eighths = DIV_ROUND_UP(*delay_off, 125);
147*f1e1ea51SMario Limonciello off_eighths = clamp_t(unsigned long, off_eighths, 1, 255);
148*f1e1ea51SMario Limonciello *delay_off = off_eighths * 125;
149*f1e1ea51SMario Limonciello
150*f1e1ea51SMario Limonciello led_blink(on_eighths, off_eighths);
151*f1e1ea51SMario Limonciello
152*f1e1ea51SMario Limonciello return 0;
153*f1e1ea51SMario Limonciello }
154*f1e1ea51SMario Limonciello
155*f1e1ea51SMario Limonciello static struct led_classdev dell_led = {
156*f1e1ea51SMario Limonciello .name = "dell::lid",
157*f1e1ea51SMario Limonciello .brightness = LED_OFF,
158*f1e1ea51SMario Limonciello .max_brightness = 1,
159*f1e1ea51SMario Limonciello .brightness_set = dell_led_set,
160*f1e1ea51SMario Limonciello .blink_set = dell_led_blink,
161*f1e1ea51SMario Limonciello .flags = LED_CORE_SUSPENDRESUME,
162*f1e1ea51SMario Limonciello };
163*f1e1ea51SMario Limonciello
dell_led_init(void)164*f1e1ea51SMario Limonciello static int __init dell_led_init(void)
165*f1e1ea51SMario Limonciello {
166*f1e1ea51SMario Limonciello int error = 0;
167*f1e1ea51SMario Limonciello
168*f1e1ea51SMario Limonciello if (!wmi_has_guid(DELL_LED_BIOS_GUID))
169*f1e1ea51SMario Limonciello return -ENODEV;
170*f1e1ea51SMario Limonciello
171*f1e1ea51SMario Limonciello error = led_off();
172*f1e1ea51SMario Limonciello if (error != 0)
173*f1e1ea51SMario Limonciello return -ENODEV;
174*f1e1ea51SMario Limonciello
175*f1e1ea51SMario Limonciello return led_classdev_register(NULL, &dell_led);
176*f1e1ea51SMario Limonciello }
177*f1e1ea51SMario Limonciello
dell_led_exit(void)178*f1e1ea51SMario Limonciello static void __exit dell_led_exit(void)
179*f1e1ea51SMario Limonciello {
180*f1e1ea51SMario Limonciello led_classdev_unregister(&dell_led);
181*f1e1ea51SMario Limonciello
182*f1e1ea51SMario Limonciello led_off();
183*f1e1ea51SMario Limonciello }
184*f1e1ea51SMario Limonciello
185*f1e1ea51SMario Limonciello module_init(dell_led_init);
186*f1e1ea51SMario Limonciello module_exit(dell_led_exit);
187