[linux-2.6-block.git] / drivers / video / backlight / lv5207lp.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Sanyo LV5207LP LED Driver
 *
 * Copyright (C) 2013 Ideas on board SPRL
 *
 * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 */

#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_data/lv5207lp.h>
#include <linux/slab.h>

#define LV5207LP_CTRL1			0x00
#define LV5207LP_CPSW			(1 << 7)
#define LV5207LP_SCTEN			(1 << 6)
#define LV5207LP_C10			(1 << 5)
#define LV5207LP_CKSW			(1 << 4)
#define LV5207LP_RSW			(1 << 3)
#define LV5207LP_GSW			(1 << 2)
#define LV5207LP_BSW			(1 << 1)
#define LV5207LP_CTRL2			0x01
#define LV5207LP_MSW			(1 << 7)
#define LV5207LP_MLED4			(1 << 6)
#define LV5207LP_RED			0x02
#define LV5207LP_GREEN			0x03
#define LV5207LP_BLUE			0x04

#define LV5207LP_MAX_BRIGHTNESS		32

struct lv5207lp {
	struct i2c_client *client;
	struct backlight_device *backlight;
	struct lv5207lp_platform_data *pdata;
};

static int lv5207lp_write(struct lv5207lp *lv, u8 reg, u8 data)
{
	return i2c_smbus_write_byte_data(lv->client, reg, data);
}

static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
{
	struct lv5207lp *lv = bl_get_data(backlight);
	int brightness = backlight->props.brightness;

	if (backlight->props.power != FB_BLANK_UNBLANK ||
	    backlight->props.fb_blank != FB_BLANK_UNBLANK ||
	    backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
		brightness = 0;

	if (brightness) {
		lv5207lp_write(lv, LV5207LP_CTRL1,
			       LV5207LP_CPSW | LV5207LP_C10 | LV5207LP_CKSW);
		lv5207lp_write(lv, LV5207LP_CTRL2,
			       LV5207LP_MSW | LV5207LP_MLED4 |
			       (brightness - 1));
	} else {
		lv5207lp_write(lv, LV5207LP_CTRL1, 0);
		lv5207lp_write(lv, LV5207LP_CTRL2, 0);
	}

	return 0;
}

static int lv5207lp_backlight_check_fb(struct backlight_device *backlight,
				       struct fb_info *info)
{
	struct lv5207lp *lv = bl_get_data(backlight);

	return lv->pdata->fbdev == NULL || lv->pdata->fbdev == info->dev;
}

static const struct backlight_ops lv5207lp_backlight_ops = {
	.options	= BL_CORE_SUSPENDRESUME,
	.update_status	= lv5207lp_backlight_update_status,
	.check_fb	= lv5207lp_backlight_check_fb,
};

static int lv5207lp_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	struct lv5207lp_platform_data *pdata = dev_get_platdata(&client->dev);
	struct backlight_device *backlight;
	struct backlight_properties props;
	struct lv5207lp *lv;

	if (pdata == NULL) {
		dev_err(&client->dev, "No platform data supplied\n");
		return -EINVAL;
	}

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_BYTE_DATA)) {
		dev_warn(&client->dev,
			 "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
		return -EIO;
	}

	lv = devm_kzalloc(&client->dev, sizeof(*lv), GFP_KERNEL);
	if (!lv)
		return -ENOMEM;

	lv->client = client;
	lv->pdata = pdata;

	memset(&props, 0, sizeof(props));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = min_t(unsigned int, pdata->max_value,
				     LV5207LP_MAX_BRIGHTNESS);
	props.brightness = clamp_t(unsigned int, pdata->def_value, 0,
				   props.max_brightness);

	backlight = devm_backlight_device_register(&client->dev,
				dev_name(&client->dev), &lv->client->dev,
				lv, &lv5207lp_backlight_ops, &props);
	if (IS_ERR(backlight)) {
		dev_err(&client->dev, "failed to register backlight\n");
		return PTR_ERR(backlight);
	}

	backlight_update_status(backlight);
	i2c_set_clientdata(client, backlight);

	return 0;
}

static int lv5207lp_remove(struct i2c_client *client)
{
	struct backlight_device *backlight = i2c_get_clientdata(client);

	backlight->props.brightness = 0;
	backlight_update_status(backlight);

	return 0;
}

static const struct i2c_device_id lv5207lp_ids[] = {
	{ "lv5207lp", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lv5207lp_ids);

static struct i2c_driver lv5207lp_driver = {
	.driver = {
		.name = "lv5207lp",
	},
	.probe = lv5207lp_probe,
	.remove = lv5207lp_remove,
	.id_table = lv5207lp_ids,
};

module_i2c_driver(lv5207lp_driver);

MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver");
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
82e5c40d LP	2	/*
	3	* Sanyo LV5207LP LED Driver
	4	*
	5	* Copyright (C) 2013 Ideas on board SPRL
	6	*
	7	* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
82e5c40d LP	8	*/
	9
	10	#include <linux/backlight.h>
	11	#include <linux/err.h>
	12	#include <linux/fb.h>
	13	#include <linux/i2c.h>
	14	#include <linux/module.h>
	15	#include <linux/platform_data/lv5207lp.h>
	16	#include <linux/slab.h>
	17
	18	#define LV5207LP_CTRL1 0x00
	19	#define LV5207LP_CPSW (1 << 7)
	20	#define LV5207LP_SCTEN (1 << 6)
	21	#define LV5207LP_C10 (1 << 5)
	22	#define LV5207LP_CKSW (1 << 4)
	23	#define LV5207LP_RSW (1 << 3)
	24	#define LV5207LP_GSW (1 << 2)
	25	#define LV5207LP_BSW (1 << 1)
	26	#define LV5207LP_CTRL2 0x01
	27	#define LV5207LP_MSW (1 << 7)
	28	#define LV5207LP_MLED4 (1 << 6)
	29	#define LV5207LP_RED 0x02
	30	#define LV5207LP_GREEN 0x03
	31	#define LV5207LP_BLUE 0x04
	32
	33	#define LV5207LP_MAX_BRIGHTNESS 32
	34
	35	struct lv5207lp {
	36	struct i2c_client *client;
	37	struct backlight_device *backlight;
	38	struct lv5207lp_platform_data *pdata;
	39	};
	40
	41	static int lv5207lp_write(struct lv5207lp *lv, u8 reg, u8 data)
	42	{
	43	return i2c_smbus_write_byte_data(lv->client, reg, data);
	44	}
	45
	46	static int lv5207lp_backlight_update_status(struct backlight_device *backlight)
	47	{
	48	struct lv5207lp *lv = bl_get_data(backlight);
	49	int brightness = backlight->props.brightness;
	50
	51	if (backlight->props.power != FB_BLANK_UNBLANK \|\|
	52	backlight->props.fb_blank != FB_BLANK_UNBLANK \|\|
	53	backlight->props.state & (BL_CORE_SUSPENDED \| BL_CORE_FBBLANK))
	54	brightness = 0;
	55
	56	if (brightness) {
	57	lv5207lp_write(lv, LV5207LP_CTRL1,
	58	LV5207LP_CPSW \| LV5207LP_C10 \| LV5207LP_CKSW);
	59	lv5207lp_write(lv, LV5207LP_CTRL2,
	60	LV5207LP_MSW \| LV5207LP_MLED4 \|
	61	(brightness - 1));
	62	} else {
	63	lv5207lp_write(lv, LV5207LP_CTRL1, 0);
	64	lv5207lp_write(lv, LV5207LP_CTRL2, 0);
	65	}
	66
	67	return 0;
	68	}
	69
82e5c40d LP	70	static int lv5207lp_backlight_check_fb(struct backlight_device *backlight,
	71	struct fb_info *info)
	72	{
	73	struct lv5207lp *lv = bl_get_data(backlight);
	74
	75	return lv->pdata->fbdev == NULL \|\| lv->pdata->fbdev == info->dev;
	76	}
	77
	78	static const struct backlight_ops lv5207lp_backlight_ops = {
	79	.options = BL_CORE_SUSPENDRESUME,
	80	.update_status = lv5207lp_backlight_update_status,
82e5c40d LP	81	.check_fb = lv5207lp_backlight_check_fb,
	82	};
	83
	84	static int lv5207lp_probe(struct i2c_client *client,
	85	const struct i2c_device_id *id)
	86	{
c512794c	87	struct lv5207lp_platform_data *pdata = dev_get_platdata(&client->dev);
82e5c40d LP	88	struct backlight_device *backlight;
	89	struct backlight_properties props;
	90	struct lv5207lp *lv;
	91
	92	if (pdata == NULL) {
	93	dev_err(&client->dev, "No platform data supplied\n");
	94	return -EINVAL;
	95	}
	96
	97	if (!i2c_check_functionality(client->adapter,
	98	I2C_FUNC_SMBUS_BYTE_DATA)) {
	99	dev_warn(&client->dev,
	100	"I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
	101	return -EIO;
	102	}
	103
	104	lv = devm_kzalloc(&client->dev, sizeof(*lv), GFP_KERNEL);
	105	if (!lv)
	106	return -ENOMEM;
	107
	108	lv->client = client;
	109	lv->pdata = pdata;
	110
	111	memset(&props, 0, sizeof(props));
	112	props.type = BACKLIGHT_RAW;
	113	props.max_brightness = min_t(unsigned int, pdata->max_value,
	114	LV5207LP_MAX_BRIGHTNESS);
	115	props.brightness = clamp_t(unsigned int, pdata->def_value, 0,
	116	props.max_brightness);
	117
e924c2aa JH	118	backlight = devm_backlight_device_register(&client->dev,
	119	dev_name(&client->dev), &lv->client->dev,
	120	lv, &lv5207lp_backlight_ops, &props);
82e5c40d LP	121	if (IS_ERR(backlight)) {
	122	dev_err(&client->dev, "failed to register backlight\n");
	123	return PTR_ERR(backlight);
	124	}
	125
	126	backlight_update_status(backlight);
	127	i2c_set_clientdata(client, backlight);
	128
	129	return 0;
	130	}
	131
	132	static int lv5207lp_remove(struct i2c_client *client)
	133	{
	134	struct backlight_device *backlight = i2c_get_clientdata(client);
	135
	136	backlight->props.brightness = 0;
	137	backlight_update_status(backlight);
82e5c40d LP	138
	139	return 0;
	140	}
	141
	142	static const struct i2c_device_id lv5207lp_ids[] = {
	143	{ "lv5207lp", 0 },
	144	{ }
	145	};
	146	MODULE_DEVICE_TABLE(i2c, lv5207lp_ids);
	147
	148	static struct i2c_driver lv5207lp_driver = {
	149	.driver = {
	150	.name = "lv5207lp",
	151	},
	152	.probe = lv5207lp_probe,
	153	.remove = lv5207lp_remove,
	154	.id_table = lv5207lp_ids,
	155	};
	156
	157	module_i2c_driver(lv5207lp_driver);
	158
	159	MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver");
	160	MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
	161	MODULE_LICENSE("GPL");