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Commit 82e5c40d authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Simon Horman
Browse files

backlight: Add Sanyo LV5207LP backlight driver 



The LV5207LP is a multi-purpose 7 LEDs driver for the mobile market.
Only the main LED is supported by this driver.

Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: default avatarJingoo Han <jg1.han@samsung.com>
Signed-off-by: default avatarSimon Horman <horms+renesas@verge.net.au>
parent 8b770e3c

drivers/video/backlight/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -432,6 +432,12 @@ config BACKLIGHT_GPIO 
	  If you have a LCD backlight adjustable by GPIO, say Y to enable

	  this driver.



config BACKLIGHT_LV5207LP

	tristate "Sanyo LV5207LP Backlight"

	depends on I2C

	help

	  If you have a Sanyo LV5207LP say Y to enable the backlight driver.



endif # BACKLIGHT_CLASS_DEVICE



endif # BACKLIGHT_LCD_SUPPORT

drivers/video/backlight/Makefile

+1 −0
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@@ -41,6 +41,7 @@ obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o 
obj-$(CONFIG_BACKLIGHT_LOCOMO)		+= locomolcd.o

obj-$(CONFIG_BACKLIGHT_LP855X)		+= lp855x_bl.o

obj-$(CONFIG_BACKLIGHT_LP8788)		+= lp8788_bl.o

obj-$(CONFIG_BACKLIGHT_LV5207LP)	+= lv5207lp.o

obj-$(CONFIG_BACKLIGHT_MAX8925)		+= max8925_bl.o

obj-$(CONFIG_BACKLIGHT_OMAP1)		+= omap1_bl.o

obj-$(CONFIG_BACKLIGHT_OT200)		+= ot200_bl.o

drivers/video/backlight/lv5207lp.c

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/*

 * Sanyo LV5207LP LED Driver

 *

 * Copyright (C) 2013 Ideas on board SPRL

 *

 * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.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/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_get_brightness(struct backlight_device *backlight)

{

	return backlight->props.brightness;

}



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,

	.get_brightness	= lv5207lp_backlight_get_brightness,

	.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 = client->dev.platform_data;

	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 = backlight_device_register(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);

	backlight_device_unregister(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");

include/linux/platform_data/lv5207lp.h

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/*

 * lv5207lp.h - Sanyo LV5207LP LEDs Driver

 *

 * 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.

 */

#ifndef __LV5207LP_H__

#define __LV5207LP_H__



struct device;



struct lv5207lp_platform_data {

	struct device *fbdev;

	unsigned int max_value;

	unsigned int def_value;

};



#endif