[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / video / backlight / da9052_bl.c

/*
 * Backlight Driver for Dialog DA9052 PMICs
 *
 * Copyright(c) 2012 Dialog Semiconductor Ltd.
 *
 * Author: David Dajun Chen <dchen@diasemi.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; either version 2 of the License, or
 * (at your option) any later version.
 *
 */

#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>

#define DA9052_MAX_BRIGHTNESS		0xFF

enum {
	DA9052_WLEDS_OFF,
	DA9052_WLEDS_ON,
};

enum {
	DA9052_TYPE_WLED1,
	DA9052_TYPE_WLED2,
	DA9052_TYPE_WLED3,
};

static const unsigned char wled_bank[] = {
	DA9052_LED1_CONF_REG,
	DA9052_LED2_CONF_REG,
	DA9052_LED3_CONF_REG,
};

struct da9052_bl {
	struct da9052 *da9052;
	uint brightness;
	uint state;
	uint led_reg;
};

static int da9052_adjust_wled_brightness(struct da9052_bl *wleds)
{
	unsigned char boost_en;
	unsigned char i_sink;
	int ret;

	boost_en = 0x3F;
	i_sink = 0xFF;
	if (wleds->state == DA9052_WLEDS_OFF) {
		boost_en = 0x00;
		i_sink = 0x00;
	}

	ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en);
	if (ret < 0)
		return ret;

	ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink);
	if (ret < 0)
		return ret;

	ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], 0x0);
	if (ret < 0)
		return ret;

	usleep_range(10000, 11000);

	if (wleds->brightness) {
		ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg],
				       wleds->brightness);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static int da9052_backlight_update_status(struct backlight_device *bl)
{
	int brightness = bl->props.brightness;
	struct da9052_bl *wleds = bl_get_data(bl);

	wleds->brightness = brightness;
	wleds->state = DA9052_WLEDS_ON;

	return da9052_adjust_wled_brightness(wleds);
}

static int da9052_backlight_get_brightness(struct backlight_device *bl)
{
	struct da9052_bl *wleds = bl_get_data(bl);

	return wleds->brightness;
}

static const struct backlight_ops da9052_backlight_ops = {
	.update_status = da9052_backlight_update_status,
	.get_brightness = da9052_backlight_get_brightness,
};

static int da9052_backlight_probe(struct platform_device *pdev)
{
	struct backlight_device *bl;
	struct backlight_properties props;
	struct da9052_bl *wleds;

	wleds = devm_kzalloc(&pdev->dev, sizeof(struct da9052_bl), GFP_KERNEL);
	if (!wleds)
		return -ENOMEM;

	wleds->da9052 = dev_get_drvdata(pdev->dev.parent);
	wleds->brightness = 0;
	wleds->led_reg = platform_get_device_id(pdev)->driver_data;
	wleds->state = DA9052_WLEDS_OFF;

	props.type = BACKLIGHT_RAW;
	props.max_brightness = DA9052_MAX_BRIGHTNESS;

	bl = backlight_device_register(pdev->name, wleds->da9052->dev, wleds,
				       &da9052_backlight_ops, &props);
	if (IS_ERR(bl)) {
		dev_err(&pdev->dev, "Failed to register backlight\n");
		return PTR_ERR(bl);
	}

	bl->props.max_brightness = DA9052_MAX_BRIGHTNESS;
	bl->props.brightness = 0;
	platform_set_drvdata(pdev, bl);

	return da9052_adjust_wled_brightness(wleds);
}

static int da9052_backlight_remove(struct platform_device *pdev)
{
	struct backlight_device *bl = platform_get_drvdata(pdev);
	struct da9052_bl *wleds = bl_get_data(bl);

	wleds->brightness = 0;
	wleds->state = DA9052_WLEDS_OFF;
	da9052_adjust_wled_brightness(wleds);
	backlight_device_unregister(bl);

	return 0;
}

static struct platform_device_id da9052_wled_ids[] = {
	{
		.name		= "da9052-wled1",
		.driver_data	= DA9052_TYPE_WLED1,
	},
	{
		.name		= "da9052-wled2",
		.driver_data	= DA9052_TYPE_WLED2,
	},
	{
		.name		= "da9052-wled3",
		.driver_data	= DA9052_TYPE_WLED3,
	},
};

static struct platform_driver da9052_wled_driver = {
	.probe		= da9052_backlight_probe,
	.remove		= da9052_backlight_remove,
	.id_table	= da9052_wled_ids,
	.driver	= {
		.name	= "da9052-wled",
		.owner	= THIS_MODULE,
	},
};

module_platform_driver(da9052_wled_driver);

MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("Backlight driver for DA9052 PMIC");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-backlight");
Commit	Line	Data
6ede3d83 AJ	1	/*
	2	* Backlight Driver for Dialog DA9052 PMICs
	3	*
	4	* Copyright(c) 2012 Dialog Semiconductor Ltd.
	5	*
	6	* Author: David Dajun Chen <dchen@diasemi.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 published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	*/
	14
	15	#include <linux/backlight.h>
	16	#include <linux/delay.h>
	17	#include <linux/fb.h>
	18	#include <linux/module.h>
	19	#include <linux/platform_device.h>
	20
	21	#include <linux/mfd/da9052/da9052.h>
	22	#include <linux/mfd/da9052/reg.h>
	23
	24	#define DA9052_MAX_BRIGHTNESS 0xFF
	25
	26	enum {
	27	DA9052_WLEDS_OFF,
	28	DA9052_WLEDS_ON,
	29	};
	30
	31	enum {
	32	DA9052_TYPE_WLED1,
	33	DA9052_TYPE_WLED2,
	34	DA9052_TYPE_WLED3,
	35	};
	36
b5d6904b	37	static const unsigned char wled_bank[] = {
6ede3d83 AJ	38	DA9052_LED1_CONF_REG,
	39	DA9052_LED2_CONF_REG,
	40	DA9052_LED3_CONF_REG,
	41	};
	42
	43	struct da9052_bl {
	44	struct da9052 *da9052;
	45	uint brightness;
	46	uint state;
	47	uint led_reg;
	48	};
	49
	50	static int da9052_adjust_wled_brightness(struct da9052_bl *wleds)
	51	{
	52	unsigned char boost_en;
	53	unsigned char i_sink;
	54	int ret;
	55
	56	boost_en = 0x3F;
	57	i_sink = 0xFF;
	58	if (wleds->state == DA9052_WLEDS_OFF) {
	59	boost_en = 0x00;
	60	i_sink = 0x00;
	61	}
	62
	63	ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en);
	64	if (ret < 0)
	65	return ret;
	66
	67	ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink);
	68	if (ret < 0)
	69	return ret;
	70
	71	ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], 0x0);
	72	if (ret < 0)
	73	return ret;
	74
5333e254	75	usleep_range(10000, 11000);
6ede3d83 AJ	76
	77	if (wleds->brightness) {
	78	ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg],
	79	wleds->brightness);
	80	if (ret < 0)
	81	return ret;
	82	}
	83
	84	return 0;
	85	}
	86
	87	static int da9052_backlight_update_status(struct backlight_device *bl)
	88	{
	89	int brightness = bl->props.brightness;
	90	struct da9052_bl *wleds = bl_get_data(bl);
	91
	92	wleds->brightness = brightness;
	93	wleds->state = DA9052_WLEDS_ON;
	94
	95	return da9052_adjust_wled_brightness(wleds);
	96	}
	97
	98	static int da9052_backlight_get_brightness(struct backlight_device *bl)
	99	{
	100	struct da9052_bl *wleds = bl_get_data(bl);
	101
	102	return wleds->brightness;
	103	}
	104
	105	static const struct backlight_ops da9052_backlight_ops = {
	106	.update_status = da9052_backlight_update_status,
	107	.get_brightness = da9052_backlight_get_brightness,
	108	};
	109
	110	static int da9052_backlight_probe(struct platform_device *pdev)
	111	{
	112	struct backlight_device *bl;
	113	struct backlight_properties props;
	114	struct da9052_bl *wleds;
	115
	116	wleds = devm_kzalloc(&pdev->dev, sizeof(struct da9052_bl), GFP_KERNEL);
	117	if (!wleds)
	118	return -ENOMEM;
	119
	120	wleds->da9052 = dev_get_drvdata(pdev->dev.parent);
	121	wleds->brightness = 0;
	122	wleds->led_reg = platform_get_device_id(pdev)->driver_data;
	123	wleds->state = DA9052_WLEDS_OFF;
	124
	125	props.type = BACKLIGHT_RAW;
	126	props.max_brightness = DA9052_MAX_BRIGHTNESS;
	127
	128	bl = backlight_device_register(pdev->name, wleds->da9052->dev, wleds,
	129	&da9052_backlight_ops, &props);
	130	if (IS_ERR(bl)) {
	131	dev_err(&pdev->dev, "Failed to register backlight\n");
6ede3d83 AJ	132	return PTR_ERR(bl);
	133	}
	134
	135	bl->props.max_brightness = DA9052_MAX_BRIGHTNESS;
	136	bl->props.brightness = 0;
	137	platform_set_drvdata(pdev, bl);
	138
	139	return da9052_adjust_wled_brightness(wleds);
	140	}
	141
	142	static int da9052_backlight_remove(struct platform_device *pdev)
	143	{
	144	struct backlight_device *bl = platform_get_drvdata(pdev);
	145	struct da9052_bl *wleds = bl_get_data(bl);
	146
	147	wleds->brightness = 0;
	148	wleds->state = DA9052_WLEDS_OFF;
	149	da9052_adjust_wled_brightness(wleds);
	150	backlight_device_unregister(bl);
6ede3d83 AJ	151
	152	return 0;
	153	}
	154
	155	static struct platform_device_id da9052_wled_ids[] = {
	156	{
	157	.name = "da9052-wled1",
	158	.driver_data = DA9052_TYPE_WLED1,
	159	},
	160	{
	161	.name = "da9052-wled2",
	162	.driver_data = DA9052_TYPE_WLED2,
	163	},
	164	{
	165	.name = "da9052-wled3",
	166	.driver_data = DA9052_TYPE_WLED3,
	167	},
	168	};
	169
	170	static struct platform_driver da9052_wled_driver = {
	171	.probe = da9052_backlight_probe,
	172	.remove = da9052_backlight_remove,
	173	.id_table = da9052_wled_ids,
	174	.driver = {
	175	.name = "da9052-wled",
	176	.owner = THIS_MODULE,
	177	},
	178	};
	179
	180	module_platform_driver(da9052_wled_driver);
	181
	182	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	183	MODULE_DESCRIPTION("Backlight driver for DA9052 PMIC");
	184	MODULE_LICENSE("GPL");
	185	MODULE_ALIAS("platform:da9052-backlight");