[net-next-2.6.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>

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>
72dcd8d0 BR	17
	18	MODULE_AUTHOR("Louis Davis/Jim Dailey");
	19	MODULE_DESCRIPTION("Dell LED Control Driver");
	20	MODULE_LICENSE("GPL");
	21
	22	#define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396"
	23	MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID);
	24
	25	/* Error Result Codes: */
	26	#define INVALID_DEVICE_ID 250
	27	#define INVALID_PARAMETER 251
	28	#define INVALID_BUFFER 252
	29	#define INTERFACE_ERROR 253
	30	#define UNSUPPORTED_COMMAND 254
	31	#define UNSPECIFIED_ERROR 255
	32
	33	/* Device ID */
	34	#define DEVICE_ID_PANEL_BACK 1
	35
	36	/* LED Commands */
	37	#define CMD_LED_ON 16
	38	#define CMD_LED_OFF 17
	39	#define CMD_LED_BLINK 18
	40
	41	struct bios_args {
	42	unsigned char length;
	43	unsigned char result_code;
	44	unsigned char device_id;
	45	unsigned char command;
	46	unsigned char on_time;
	47	unsigned char off_time;
	48	};
	49
	50	static int dell_led_perform_fn(u8 length,
	51	u8 result_code,
	52	u8 device_id,
	53	u8 command,
	54	u8 on_time,
	55	u8 off_time)
	56	{
	57	struct bios_args *bios_return;
	58	u8 return_code;
	59	union acpi_object *obj;
	60	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
	61	struct acpi_buffer input;
	62	acpi_status status;
	63
	64	struct bios_args args;
	65	args.length = length;
	66	args.result_code = result_code;
	67	args.device_id = device_id;
	68	args.command = command;
	69	args.on_time = on_time;
	70	args.off_time = off_time;
	71
	72	input.length = sizeof(struct bios_args);
	73	input.pointer = &args;
	74
	75	status = wmi_evaluate_method(DELL_LED_BIOS_GUID,
	76	1,
	77	1,
	78	&input,
	79	&output);
	80
81	if (ACPI_FAILURE(status))
82	return status;
83
84	obj = output.pointer;
85
86	if (!obj)
87	return -EINVAL;
88	else if (obj->type != ACPI_TYPE_BUFFER) {
89	kfree(obj);
90	return -EINVAL;
91	}
92
93	bios_return = ((struct bios_args *)obj->buffer.pointer);
94	return_code = bios_return->result_code;
95
96	kfree(obj);
97
98	return return_code;
99	}
100
101	static int led_on(void)
102	{
103	return dell_led_perform_fn(3, /* Length of command */
104	INTERFACE_ERROR, /* Init to INTERFACE_ERROR */
105	DEVICE_ID_PANEL_BACK, /* Device ID */
106	CMD_LED_ON, /* Command */
107	0, /* not used */
108	0); /* not used */
109	}
110
111	static int led_off(void)
112	{
113	return dell_led_perform_fn(3, /* Length of command */
114	INTERFACE_ERROR, /* Init to INTERFACE_ERROR */
115	DEVICE_ID_PANEL_BACK, /* Device ID */
116	CMD_LED_OFF, /* Command */
117	0, /* not used */
118	0); /* not used */
119	}
120
121	static int led_blink(unsigned char on_eighths,
122	unsigned char off_eighths)
123	{
124	return dell_led_perform_fn(5, /* Length of command */
125	INTERFACE_ERROR, /* Init to INTERFACE_ERROR */
126	DEVICE_ID_PANEL_BACK, /* Device ID */
127	CMD_LED_BLINK, /* Command */
128	on_eighths, /* blink on in eigths of a second */
129	off_eighths); /* blink off in eights of a second */
130	}
131
132	static void dell_led_set(struct led_classdev *led_cdev,
133	enum led_brightness value)
134	{
135	if (value == LED_OFF)
136	led_off();
137	else
138	led_on();
139	}
140
141	static int dell_led_blink(struct led_classdev *led_cdev,
142	unsigned long *delay_on,
143	unsigned long *delay_off)
144	{
145	unsigned long on_eighths;
146	unsigned long off_eighths;
147
148	/* The Dell LED delay is based on 125ms intervals.
149	Need to round up to next interval. */
150
151	on_eighths = (*delay_on + 124) / 125;
152	if (0 == on_eighths)
153	on_eighths = 1;
154	if (on_eighths > 255)
155	on_eighths = 255;
156	delay_on = on_eighths 125;
157
158	off_eighths = (*delay_off + 124) / 125;
159	if (0 == off_eighths)
160	off_eighths = 1;
161	if (off_eighths > 255)
162	off_eighths = 255;
163	delay_off = off_eighths 125;
164
165	led_blink(on_eighths, off_eighths);
166
167	return 0;
168	}
169
170	static struct led_classdev dell_led = {
171	.name = "dell::lid",
172	.brightness = LED_OFF,
173	.max_brightness = 1,
174	.brightness_set = dell_led_set,
175	.blink_set = dell_led_blink,
176	.flags = LED_CORE_SUSPENDRESUME,
177	};
178
179	static int __init dell_led_init(void)
180	{
181	int error = 0;
182
183	if (!wmi_has_guid(DELL_LED_BIOS_GUID))
184	return -ENODEV;
185
186	error = led_off();
187	if (error != 0)
188	return -ENODEV;
189
190	return led_classdev_register(NULL, &dell_led);
191	}
192
193	static void __exit dell_led_exit(void)
194	{
195	led_classdev_unregister(&dell_led);
196
197	led_off();
198	}
199
200	module_init(dell_led_init);
201	module_exit(dell_led_exit);