[mirror_ubuntu-artful-kernel.git] / drivers / platform / x86 / samsung-q10.c

/*
 *  Driver for Samsung Q10 and related laptops: controls the backlight
 *
 *  Copyright (c) 2011 Frederick van der Wyck <fvanderwyck@gmail.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/backlight.h>
#include <linux/dmi.h>
#include <linux/acpi.h>

#define SAMSUNGQ10_BL_MAX_INTENSITY 7

static acpi_handle ec_handle;

static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force,
		"Disable the DMI check and force the driver to be loaded");

static int samsungq10_bl_set_intensity(struct backlight_device *bd)
{

	acpi_status status;
	int i;

	for (i = 0; i < SAMSUNGQ10_BL_MAX_INTENSITY; i++) {
		status = acpi_evaluate_object(ec_handle, "_Q63", NULL, NULL);
		if (ACPI_FAILURE(status))
			return -EIO;
	}
	for (i = 0; i < bd->props.brightness; i++) {
		status = acpi_evaluate_object(ec_handle, "_Q64", NULL, NULL);
		if (ACPI_FAILURE(status))
			return -EIO;
	}

	return 0;
}

static const struct backlight_ops samsungq10_bl_ops = {
	.update_status	= samsungq10_bl_set_intensity,
};

static int samsungq10_probe(struct platform_device *pdev)
{

	struct backlight_properties props;
	struct backlight_device *bd;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_PLATFORM;
	props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY;
	bd = backlight_device_register("samsung", &pdev->dev, NULL,
				       &samsungq10_bl_ops, &props);
	if (IS_ERR(bd))
		return PTR_ERR(bd);

	platform_set_drvdata(pdev, bd);

	return 0;
}

static int samsungq10_remove(struct platform_device *pdev)
{

	struct backlight_device *bd = platform_get_drvdata(pdev);

	backlight_device_unregister(bd);

	return 0;
}

static struct platform_driver samsungq10_driver = {
	.driver		= {
		.name	= KBUILD_MODNAME,
	},
	.probe		= samsungq10_probe,
	.remove		= samsungq10_remove,
};

static struct platform_device *samsungq10_device;

static int __init dmi_check_callback(const struct dmi_system_id *id)
{
	printk(KERN_INFO KBUILD_MODNAME ": found model '%s'\n", id->ident);
	return 1;
}

static struct dmi_system_id __initdata samsungq10_dmi_table[] = {
	{
		.ident = "Samsung Q10",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Samsung"),
			DMI_MATCH(DMI_PRODUCT_NAME, "SQ10"),
		},
		.callback = dmi_check_callback,
	},
	{
		.ident = "Samsung Q20",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
			DMI_MATCH(DMI_PRODUCT_NAME, "SENS Q20"),
		},
		.callback = dmi_check_callback,
	},
	{
		.ident = "Samsung Q25",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
			DMI_MATCH(DMI_PRODUCT_NAME, "NQ25"),
		},
		.callback = dmi_check_callback,
	},
	{
		.ident = "Dell Latitude X200",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
			DMI_MATCH(DMI_PRODUCT_NAME, "X200"),
		},
		.callback = dmi_check_callback,
	},
	{ },
};
MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table);

static int __init samsungq10_init(void)
{
	if (!force && !dmi_check_system(samsungq10_dmi_table))
		return -ENODEV;

	ec_handle = ec_get_handle();

	if (!ec_handle)
		return -ENODEV;

	samsungq10_device = platform_create_bundle(&samsungq10_driver,
						   samsungq10_probe,
						   NULL, 0, NULL, 0);

	return PTR_ERR_OR_ZERO(samsungq10_device);
}

static void __exit samsungq10_exit(void)
{
	platform_device_unregister(samsungq10_device);
	platform_driver_unregister(&samsungq10_driver);
}

module_init(samsungq10_init);
module_exit(samsungq10_exit);

MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>");
MODULE_DESCRIPTION("Samsung Q10 Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
78542e18 FW	1	/*
	2	* Driver for Samsung Q10 and related laptops: controls the backlight
	3	*
	4	* Copyright (c) 2011 Frederick van der Wyck <fvanderwyck@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/kernel.h>
	14	#include <linux/init.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/backlight.h>
78542e18	17	#include <linux/dmi.h>
8b48463f	18	#include <linux/acpi.h>
78542e18	19
aa3b88a3	20	#define SAMSUNGQ10_BL_MAX_INTENSITY 7
78542e18	21
aa3b88a3	22	static acpi_handle ec_handle;
78542e18 FW	23
	24	static bool force;
	25	module_param(force, bool, 0);
	26	MODULE_PARM_DESC(force,
	27	"Disable the DMI check and force the driver to be loaded");
	28
	29	static int samsungq10_bl_set_intensity(struct backlight_device *bd)
	30	{
	31
aa3b88a3 FW	32	acpi_status status;
aa3b88a3 FW	33	int i;
78542e18	34
aa3b88a3 FW	35	for (i = 0; i < SAMSUNGQ10_BL_MAX_INTENSITY; i++) {
	36	status = acpi_evaluate_object(ec_handle, "_Q63", NULL, NULL);
	37	if (ACPI_FAILURE(status))
	38	return -EIO;
	39	}
	40	for (i = 0; i < bd->props.brightness; i++) {
	41	status = acpi_evaluate_object(ec_handle, "_Q64", NULL, NULL);
	42	if (ACPI_FAILURE(status))
	43	return -EIO;
	44	}
78542e18 FW	45
	46	return 0;
	47	}
	48
78542e18	49	static const struct backlight_ops samsungq10_bl_ops = {
78542e18 FW	50	.update_status = samsungq10_bl_set_intensity,
	51	};
	52
b859f159	53	static int samsungq10_probe(struct platform_device *pdev)
78542e18 FW	54	{
	55
	56	struct backlight_properties props;
	57	struct backlight_device *bd;
	58
	59	memset(&props, 0, sizeof(struct backlight_properties));
	60	props.type = BACKLIGHT_PLATFORM;
	61	props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY;
	62	bd = backlight_device_register("samsung", &pdev->dev, NULL,
	63	&samsungq10_bl_ops, &props);
	64	if (IS_ERR(bd))
	65	return PTR_ERR(bd);
	66
	67	platform_set_drvdata(pdev, bd);
	68
78542e18 FW	69	return 0;
	70	}
	71
b859f159	72	static int samsungq10_remove(struct platform_device *pdev)
78542e18 FW	73	{
	74
	75	struct backlight_device *bd = platform_get_drvdata(pdev);
	76
78542e18 FW	77	backlight_device_unregister(bd);
	78
	79	return 0;
	80	}
	81
	82	static struct platform_driver samsungq10_driver = {
	83	.driver = {
	84	.name = KBUILD_MODNAME,
78542e18 FW	85	},
78542e18 FW	86	.probe = samsungq10_probe,
b859f159	87	.remove = samsungq10_remove,
78542e18 FW	88	};
	89
	90	static struct platform_device *samsungq10_device;
	91
	92	static int __init dmi_check_callback(const struct dmi_system_id *id)
	93	{
	94	printk(KERN_INFO KBUILD_MODNAME ": found model '%s'\n", id->ident);
046f828b	95	return 1;
78542e18 FW	96	}
	97
	98	static struct dmi_system_id __initdata samsungq10_dmi_table[] = {
	99	{
	100	.ident = "Samsung Q10",
	101	.matches = {
	102	DMI_MATCH(DMI_SYS_VENDOR, "Samsung"),
	103	DMI_MATCH(DMI_PRODUCT_NAME, "SQ10"),
	104	},
	105	.callback = dmi_check_callback,
	106	},
	107	{
	108	.ident = "Samsung Q20",
	109	.matches = {
	110	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
	111	DMI_MATCH(DMI_PRODUCT_NAME, "SENS Q20"),
	112	},
	113	.callback = dmi_check_callback,
	114	},
	115	{
	116	.ident = "Samsung Q25",
	117	.matches = {
	118	DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
	119	DMI_MATCH(DMI_PRODUCT_NAME, "NQ25"),
	120	},
	121	.callback = dmi_check_callback,
	122	},
	123	{
	124	.ident = "Dell Latitude X200",
	125	.matches = {
	126	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
	127	DMI_MATCH(DMI_PRODUCT_NAME, "X200"),
	128	},
	129	.callback = dmi_check_callback,
	130	},
	131	{ },
	132	};
	133	MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table);
	134
	135	static int __init samsungq10_init(void)
	136	{
	137	if (!force && !dmi_check_system(samsungq10_dmi_table))
	138	return -ENODEV;
	139
aa3b88a3 FW	140	ec_handle = ec_get_handle();
	141
	142	if (!ec_handle)
	143	return -ENODEV;
	144
78542e18 FW	145	samsungq10_device = platform_create_bundle(&samsungq10_driver,
	146	samsungq10_probe,
	147	NULL, 0, NULL, 0);
	148
8c6ffba0	149	return PTR_ERR_OR_ZERO(samsungq10_device);
78542e18 FW	150	}
	151
	152	static void __exit samsungq10_exit(void)
	153	{
	154	platform_device_unregister(samsungq10_device);
	155	platform_driver_unregister(&samsungq10_driver);
	156	}
	157
	158	module_init(samsungq10_init);
	159	module_exit(samsungq10_exit);
	160
	161	MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>");
	162	MODULE_DESCRIPTION("Samsung Q10 Driver");
	163	MODULE_LICENSE("GPL");