[linux-2.6-block.git] / drivers / video / backlight / da903x_bl.c

/*
 * Backlight driver for Dialog Semiconductor DA9030/DA9034
 *
 * Copyright (C) 2008 Compulab, Ltd.
 *	Mike Rapoport <mike@compulab.co.il>
 *
 * Copyright (C) 2006-2008 Marvell International Ltd.
 *	Eric Miao <eric.miao@marvell.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/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/mfd/da903x.h>
#include <linux/slab.h>
#include <linux/module.h>

#define DA9030_WLED_CONTROL	0x25
#define DA9030_WLED_CP_EN	(1 << 6)
#define DA9030_WLED_TRIM(x)	((x) & 0x7)

#define DA9034_WLED_CONTROL1	0x3C
#define DA9034_WLED_CONTROL2	0x3D
#define DA9034_WLED_ISET(x)	((x) & 0x1f)

#define DA9034_WLED_BOOST_EN	(1 << 5)

#define DA9030_MAX_BRIGHTNESS	7
#define DA9034_MAX_BRIGHTNESS	0x7f

struct da903x_backlight_data {
	struct device *da903x_dev;
	int id;
	int current_brightness;
};

static int da903x_backlight_set(struct backlight_device *bl, int brightness)
{
	struct da903x_backlight_data *data = bl_get_data(bl);
	struct device *dev = data->da903x_dev;
	uint8_t val;
	int ret = 0;

	switch (data->id) {
	case DA9034_ID_WLED:
		ret = da903x_update(dev, DA9034_WLED_CONTROL1,
				brightness, 0x7f);
		if (ret)
			return ret;

		if (data->current_brightness && brightness == 0)
			ret = da903x_clr_bits(dev,
					DA9034_WLED_CONTROL2,
					DA9034_WLED_BOOST_EN);

		if (data->current_brightness == 0 && brightness)
			ret = da903x_set_bits(dev,
					DA9034_WLED_CONTROL2,
					DA9034_WLED_BOOST_EN);
		break;
	case DA9030_ID_WLED:
		val = DA9030_WLED_TRIM(brightness);
		val |= brightness ? DA9030_WLED_CP_EN : 0;
		ret = da903x_write(dev, DA9030_WLED_CONTROL, val);
		break;
	}

	if (ret)
		return ret;

	data->current_brightness = brightness;
	return 0;
}

static int da903x_backlight_update_status(struct backlight_device *bl)
{
	int brightness = bl->props.brightness;

	if (bl->props.power != FB_BLANK_UNBLANK)
		brightness = 0;

	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
		brightness = 0;

	if (bl->props.state & BL_CORE_SUSPENDED)
		brightness = 0;

	return da903x_backlight_set(bl, brightness);
}

static int da903x_backlight_get_brightness(struct backlight_device *bl)
{
	struct da903x_backlight_data *data = bl_get_data(bl);

	return data->current_brightness;
}

static const struct backlight_ops da903x_backlight_ops = {
	.options	= BL_CORE_SUSPENDRESUME,
	.update_status	= da903x_backlight_update_status,
	.get_brightness	= da903x_backlight_get_brightness,
};

static int da903x_backlight_probe(struct platform_device *pdev)
{
	struct da9034_backlight_pdata *pdata = dev_get_platdata(&pdev->dev);
	struct da903x_backlight_data *data;
	struct backlight_device *bl;
	struct backlight_properties props;
	int max_brightness;

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;

	switch (pdev->id) {
	case DA9030_ID_WLED:
		max_brightness = DA9030_MAX_BRIGHTNESS;
		break;
	case DA9034_ID_WLED:
		max_brightness = DA9034_MAX_BRIGHTNESS;
		break;
	default:
		dev_err(&pdev->dev, "invalid backlight device ID(%d)\n",
				pdev->id);
		return -EINVAL;
	}

	data->id = pdev->id;
	data->da903x_dev = pdev->dev.parent;
	data->current_brightness = 0;

	/* adjust the WLED output current */
	if (pdata)
		da903x_write(data->da903x_dev, DA9034_WLED_CONTROL2,
				DA9034_WLED_ISET(pdata->output_current));

	memset(&props, 0, sizeof(props));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = max_brightness;
	bl = devm_backlight_device_register(&pdev->dev, pdev->name,
					data->da903x_dev, data,
					&da903x_backlight_ops, &props);
	if (IS_ERR(bl)) {
		dev_err(&pdev->dev, "failed to register backlight\n");
		return PTR_ERR(bl);
	}

	bl->props.brightness = max_brightness;

	platform_set_drvdata(pdev, bl);
	backlight_update_status(bl);
	return 0;
}

static struct platform_driver da903x_backlight_driver = {
	.driver		= {
		.name	= "da903x-backlight",
	},
	.probe		= da903x_backlight_probe,
};

module_platform_driver(da903x_backlight_driver);

MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034");
MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da903x-backlight");
Commit	Line	Data
923ae48b MR	1	/*
	2	* Backlight driver for Dialog Semiconductor DA9030/DA9034
	3	*
	4	* Copyright (C) 2008 Compulab, Ltd.
685746d4	5	* Mike Rapoport <mike@compulab.co.il>
923ae48b MR	6	*
923ae48b MR	7	* Copyright (C) 2006-2008 Marvell International Ltd.
685746d4	8	* Eric Miao <eric.miao@marvell.com>
923ae48b MR	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*/
	14
	15	#include <linux/kernel.h>
	16	#include <linux/init.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/fb.h>
	19	#include <linux/backlight.h>
	20	#include <linux/mfd/da903x.h>
5a0e3ad6	21	#include <linux/slab.h>
355b200b	22	#include <linux/module.h>
923ae48b MR	23
	24	#define DA9030_WLED_CONTROL 0x25
	25	#define DA9030_WLED_CP_EN (1 << 6)
	26	#define DA9030_WLED_TRIM(x) ((x) & 0x7)
	27
	28	#define DA9034_WLED_CONTROL1 0x3C
	29	#define DA9034_WLED_CONTROL2 0x3D
b3a85495	30	#define DA9034_WLED_ISET(x) ((x) & 0x1f)
923ae48b MR	31
	32	#define DA9034_WLED_BOOST_EN (1 << 5)
	33
	34	#define DA9030_MAX_BRIGHTNESS 7
	35	#define DA9034_MAX_BRIGHTNESS 0x7f
	36
	37	struct da903x_backlight_data {
	38	struct device *da903x_dev;
	39	int id;
	40	int current_brightness;
	41	};
	42
	43	static int da903x_backlight_set(struct backlight_device *bl, int brightness)
	44	{
	45	struct da903x_backlight_data *data = bl_get_data(bl);
	46	struct device *dev = data->da903x_dev;
	47	uint8_t val;
	48	int ret = 0;
	49
	50	switch (data->id) {
	51	case DA9034_ID_WLED:
	52	ret = da903x_update(dev, DA9034_WLED_CONTROL1,
	53	brightness, 0x7f);
	54	if (ret)
	55	return ret;
	56
	57	if (data->current_brightness && brightness == 0)
	58	ret = da903x_clr_bits(dev,
	59	DA9034_WLED_CONTROL2,
	60	DA9034_WLED_BOOST_EN);
	61
	62	if (data->current_brightness == 0 && brightness)
	63	ret = da903x_set_bits(dev,
	64	DA9034_WLED_CONTROL2,
	65	DA9034_WLED_BOOST_EN);
	66	break;
	67	case DA9030_ID_WLED:
	68	val = DA9030_WLED_TRIM(brightness);
	69	val \|= brightness ? DA9030_WLED_CP_EN : 0;
	70	ret = da903x_write(dev, DA9030_WLED_CONTROL, val);
	71	break;
	72	}
	73
	74	if (ret)
	75	return ret;
	76
	77	data->current_brightness = brightness;
	78	return 0;
	79	}
	80
	81	static int da903x_backlight_update_status(struct backlight_device *bl)
	82	{
	83	int brightness = bl->props.brightness;
	84
	85	if (bl->props.power != FB_BLANK_UNBLANK)
	86	brightness = 0;
	87
	88	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
	89	brightness = 0;
	90
d1720b57 JH	91	if (bl->props.state & BL_CORE_SUSPENDED)
	92	brightness = 0;
	93
923ae48b MR	94	return da903x_backlight_set(bl, brightness);
	95	}
	96
	97	static int da903x_backlight_get_brightness(struct backlight_device *bl)
	98	{
	99	struct da903x_backlight_data *data = bl_get_data(bl);
d1720b57	100
923ae48b MR	101	return data->current_brightness;
	102	}
	103
9905a43b	104	static const struct backlight_ops da903x_backlight_ops = {
d1720b57	105	.options = BL_CORE_SUSPENDRESUME,
923ae48b MR	106	.update_status = da903x_backlight_update_status,
	107	.get_brightness = da903x_backlight_get_brightness,
	108	};
	109
	110	static int da903x_backlight_probe(struct platform_device *pdev)
	111	{
c512794c	112	struct da9034_backlight_pdata *pdata = dev_get_platdata(&pdev->dev);
923ae48b MR	113	struct da903x_backlight_data *data;
923ae48b MR	114	struct backlight_device *bl;
a19a6ee6	115	struct backlight_properties props;
923ae48b MR	116	int max_brightness;
923ae48b MR	117
ce969228	118	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
923ae48b MR	119	if (data == NULL)
	120	return -ENOMEM;
	121
	122	switch (pdev->id) {
	123	case DA9030_ID_WLED:
	124	max_brightness = DA9030_MAX_BRIGHTNESS;
	125	break;
	126	case DA9034_ID_WLED:
	127	max_brightness = DA9034_MAX_BRIGHTNESS;
	128	break;
	129	default:
	130	dev_err(&pdev->dev, "invalid backlight device ID(%d)\n",
	131	pdev->id);
	132	return -EINVAL;
	133	}
	134
	135	data->id = pdev->id;
	136	data->da903x_dev = pdev->dev.parent;
	137	data->current_brightness = 0;
	138
b3a85495 HZ	139	/* adjust the WLED output current */
	140	if (pdata)
	141	da903x_write(data->da903x_dev, DA9034_WLED_CONTROL2,
	142	DA9034_WLED_ISET(pdata->output_current));
	143
f5f4fd45	144	memset(&props, 0, sizeof(props));
bb7ca747	145	props.type = BACKLIGHT_RAW;
a19a6ee6	146	props.max_brightness = max_brightness;
56445293 JH	147	bl = devm_backlight_device_register(&pdev->dev, pdev->name,
	148	data->da903x_dev, data,
	149	&da903x_backlight_ops, &props);
923ae48b MR	150	if (IS_ERR(bl)) {
	151	dev_err(&pdev->dev, "failed to register backlight\n");
	152	return PTR_ERR(bl);
	153	}
	154
923ae48b MR	155	bl->props.brightness = max_brightness;
	156
	157	platform_set_drvdata(pdev, bl);
	158	backlight_update_status(bl);
	159	return 0;
	160	}
	161
923ae48b MR	162	static struct platform_driver da903x_backlight_driver = {
	163	.driver = {
	164	.name = "da903x-backlight",
923ae48b MR	165	},
923ae48b MR	166	.probe = da903x_backlight_probe,
923ae48b MR	167	};
923ae48b MR	168
81178e02	169	module_platform_driver(da903x_backlight_driver);
923ae48b MR	170
923ae48b MR	171	MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034");
685746d4 JH	172	MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
685746d4 JH	173	MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
923ae48b MR	174	MODULE_LICENSE("GPL");
923ae48b MR	175	MODULE_ALIAS("platform:da903x-backlight");