[linux-2.6-block.git] / drivers / leds / dell-led.c

/*
 * dell_led.c - Dell LED Driver
 *
 * Copyright (C) 2010 Dell Inc.
 * Louis Davis <louis_davis@dell.com>
 * Jim Dailey <jim_dailey@dell.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 */

#include <linux/acpi.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/module.h>

MODULE_AUTHOR("Louis Davis/Jim Dailey");
MODULE_DESCRIPTION("Dell LED Control Driver");
MODULE_LICENSE("GPL");

#define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396"
MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID);

/* Error Result Codes: */
#define INVALID_DEVICE_ID	250
#define INVALID_PARAMETER	251
#define INVALID_BUFFER		252
#define INTERFACE_ERROR		253
#define UNSUPPORTED_COMMAND	254
#define UNSPECIFIED_ERROR	255

/* Device ID */
#define DEVICE_ID_PANEL_BACK	1

/* LED Commands */
#define CMD_LED_ON	16
#define CMD_LED_OFF	17
#define CMD_LED_BLINK	18

struct bios_args {
	unsigned char length;
	unsigned char result_code;
	unsigned char device_id;
	unsigned char command;
	unsigned char on_time;
	unsigned char off_time;
};

static int dell_led_perform_fn(u8 length,
		u8 result_code,
		u8 device_id,
		u8 command,
		u8 on_time,
		u8 off_time)
{
	struct bios_args *bios_return;
	u8 return_code;
	union acpi_object *obj;
	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_buffer input;
	acpi_status status;

	struct bios_args args;
	args.length = length;
	args.result_code = result_code;
	args.device_id = device_id;
	args.command = command;
	args.on_time = on_time;
	args.off_time = off_time;

	input.length = sizeof(struct bios_args);
	input.pointer = &args;

	status = wmi_evaluate_method(DELL_LED_BIOS_GUID,
		1,
		1,
		&input,
		&output);

	if (ACPI_FAILURE(status))
		return status;

	obj = output.pointer;

	if (!obj)
		return -EINVAL;
	else if (obj->type != ACPI_TYPE_BUFFER) {
		kfree(obj);
		return -EINVAL;
	}

	bios_return = ((struct bios_args *)obj->buffer.pointer);
	return_code = bios_return->result_code;

	kfree(obj);

	return return_code;
}

static int led_on(void)
{
	return dell_led_perform_fn(3,	/* Length of command */
		INTERFACE_ERROR,	/* Init to  INTERFACE_ERROR */
		DEVICE_ID_PANEL_BACK,	/* Device ID */
		CMD_LED_ON,		/* Command */
		0,			/* not used */
		0);			/* not used */
}

static int led_off(void)
{
	return dell_led_perform_fn(3,	/* Length of command */
		INTERFACE_ERROR,	/* Init to  INTERFACE_ERROR */
		DEVICE_ID_PANEL_BACK,	/* Device ID */
		CMD_LED_OFF,		/* Command */
		0,			/* not used */
		0);			/* not used */
}

static int led_blink(unsigned char on_eighths,
		unsigned char off_eighths)
{
	return dell_led_perform_fn(5,	/* Length of command */
		INTERFACE_ERROR,	/* Init to  INTERFACE_ERROR */
		DEVICE_ID_PANEL_BACK,	/* Device ID */
		CMD_LED_BLINK,		/* Command */
		on_eighths,		/* blink on in eigths of a second */
		off_eighths);		/* blink off in eights of a second */
}

static void dell_led_set(struct led_classdev *led_cdev,
		enum led_brightness value)
{
	if (value == LED_OFF)
		led_off();
	else
		led_on();
}

static int dell_led_blink(struct led_classdev *led_cdev,
		unsigned long *delay_on,
		unsigned long *delay_off)
{
	unsigned long on_eighths;
	unsigned long off_eighths;

	/* The Dell LED delay is based on 125ms intervals.
	   Need to round up to next interval. */

	on_eighths = (*delay_on + 124) / 125;
	if (0 == on_eighths)
		on_eighths = 1;
	if (on_eighths > 255)
		on_eighths = 255;
	*delay_on = on_eighths * 125;

	off_eighths = (*delay_off + 124) / 125;
	if (0 == off_eighths)
		off_eighths = 1;
	if (off_eighths > 255)
		off_eighths = 255;
	*delay_off = off_eighths * 125;

	led_blink(on_eighths, off_eighths);

	return 0;
}

static struct led_classdev dell_led = {
	.name		= "dell::lid",
	.brightness	= LED_OFF,
	.max_brightness = 1,
	.brightness_set = dell_led_set,
	.blink_set	= dell_led_blink,
	.flags		= LED_CORE_SUSPENDRESUME,
};

static int __init dell_led_init(void)
{
	int error = 0;

	if (!wmi_has_guid(DELL_LED_BIOS_GUID))
		return -ENODEV;

	error = led_off();
	if (error != 0)
		return -ENODEV;

	return led_classdev_register(NULL, &dell_led);
}

static void __exit dell_led_exit(void)
{
	led_classdev_unregister(&dell_led);

	led_off();
}

module_init(dell_led_init);
module_exit(dell_led_exit);
Commit	Line	Data
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>
72dcd8d0 BR	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);