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Commit 67b43e59 authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Simon Horman
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backlight: Add ROHM BD6107 backlight driver 



The BD6107 is a multi-purpose 10 channels LED driver for the mobile
market. Only the main channel 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 82e5c40d

drivers/video/backlight/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -438,6 +438,12 @@ config BACKLIGHT_LV5207LP 
	help

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



config BACKLIGHT_BD6107

	tristate "Rohm BD6107 Backlight"

	depends on I2C

	help

	  If you have a Rohm BD6107 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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@@ -26,6 +26,7 @@ obj-$(CONFIG_BACKLIGHT_ADP8870) += adp8870_bl.o 
obj-$(CONFIG_BACKLIGHT_APPLE)		+= apple_bl.o

obj-$(CONFIG_BACKLIGHT_AS3711)		+= as3711_bl.o

obj-$(CONFIG_BACKLIGHT_ATMEL_PWM)	+= atmel-pwm-bl.o

obj-$(CONFIG_BACKLIGHT_BD6107)		+= bd6107.o

obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH)	+= cr_bllcd.o

obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE)	+= backlight.o

obj-$(CONFIG_BACKLIGHT_DA903X)		+= da903x_bl.o

drivers/video/backlight/bd6107.c

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/*

 * ROHM Semiconductor BD6107 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/delay.h>

#include <linux/err.h>

#include <linux/fb.h>

#include <linux/gpio.h>

#include <linux/i2c.h>

#include <linux/module.h>

#include <linux/platform_data/bd6107.h>

#include <linux/slab.h>



#define BD6107_PSCNT1				0x00

#define BD6107_PSCNT1_PSCNTREG2			(1 << 2)

#define BD6107_PSCNT1_PSCNTREG1			(1 << 0)

#define BD6107_REGVSET				0x02

#define BD6107_REGVSET_REG1VSET_2_85V		(1 << 2)

#define BD6107_REGVSET_REG1VSET_2_80V		(0 << 2)

#define BD6107_LEDCNT1				0x03

#define BD6107_LEDCNT1_LEDONOFF2		(1 << 1)

#define BD6107_LEDCNT1_LEDONOFF1		(1 << 0)

#define BD6107_PORTSEL				0x04

#define BD6107_PORTSEL_LEDM(n)			(1 << (n))

#define BD6107_RGB1CNT1				0x05

#define BD6107_RGB1CNT2				0x06

#define BD6107_RGB1CNT3				0x07

#define BD6107_RGB1CNT4				0x08

#define BD6107_RGB1CNT5				0x09

#define BD6107_RGB1FLM				0x0a

#define BD6107_RGB2CNT1				0x0b

#define BD6107_RGB2CNT2				0x0c

#define BD6107_RGB2CNT3				0x0d

#define BD6107_RGB2CNT4				0x0e

#define BD6107_RGB2CNT5				0x0f

#define BD6107_RGB2FLM				0x10

#define BD6107_PSCONT3				0x11

#define BD6107_SMMONCNT				0x12

#define BD6107_DCDCCNT				0x13

#define BD6107_IOSEL				0x14

#define BD6107_OUT1				0x15

#define BD6107_OUT2				0x16

#define BD6107_MASK1				0x17

#define BD6107_MASK2				0x18

#define BD6107_FACTOR1				0x19

#define BD6107_FACTOR2				0x1a

#define BD6107_CLRFACT1				0x1b

#define BD6107_CLRFACT2				0x1c

#define BD6107_STATE1				0x1d

#define BD6107_LSIVER				0x1e

#define BD6107_GRPSEL				0x1f

#define BD6107_LEDCNT2				0x20

#define BD6107_LEDCNT3				0x21

#define BD6107_MCURRENT				0x22

#define BD6107_MAINCNT1				0x23

#define BD6107_MAINCNT2				0x24

#define BD6107_SLOPECNT				0x25

#define BD6107_MSLOPE				0x26

#define BD6107_RGBSLOPE				0x27

#define BD6107_TEST				0x29

#define BD6107_SFTRST				0x2a

#define BD6107_SFTRSTGD				0x2b



struct bd6107 {

	struct i2c_client *client;

	struct backlight_device *backlight;

	struct bd6107_platform_data *pdata;

};



static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data)

{

	return i2c_smbus_write_byte_data(bd->client, reg, data);

}



static int bd6107_backlight_update_status(struct backlight_device *backlight)

{

	struct bd6107 *bd = 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) {

		bd6107_write(bd, BD6107_PORTSEL, BD6107_PORTSEL_LEDM(2) |

			     BD6107_PORTSEL_LEDM(1) | BD6107_PORTSEL_LEDM(0));

		bd6107_write(bd, BD6107_MAINCNT1, brightness);

		bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1);

	} else {

		gpio_set_value(bd->pdata->reset, 0);

		msleep(24);

		gpio_set_value(bd->pdata->reset, 1);

	}



	return 0;

}



static int bd6107_backlight_get_brightness(struct backlight_device *backlight)

{

	return backlight->props.brightness;

}



static int bd6107_backlight_check_fb(struct backlight_device *backlight,

				       struct fb_info *info)

{

	struct bd6107 *bd = bl_get_data(backlight);



	return bd->pdata->fbdev == NULL || bd->pdata->fbdev == info->dev;

}



static const struct backlight_ops bd6107_backlight_ops = {

	.options	= BL_CORE_SUSPENDRESUME,

	.update_status	= bd6107_backlight_update_status,

	.get_brightness	= bd6107_backlight_get_brightness,

	.check_fb	= bd6107_backlight_check_fb,

};



static int bd6107_probe(struct i2c_client *client,

			  const struct i2c_device_id *id)

{

	struct bd6107_platform_data *pdata = client->dev.platform_data;

	struct backlight_device *backlight;

	struct backlight_properties props;

	struct bd6107 *bd;

	int ret;



	if (pdata == NULL || !pdata->reset) {

		dev_err(&client->dev, "No reset GPIO in platform data\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;

	}



	bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);

	if (!bd)

		return -ENOMEM;



	bd->client = client;

	bd->pdata = pdata;



	ret = devm_gpio_request_one(&client->dev, pdata->reset,

				    GPIOF_DIR_OUT | GPIOF_INIT_LOW, "reset");

	if (ret < 0) {

		dev_err(&client->dev, "unable to request reset GPIO\n");

		return ret;

	}



	memset(&props, 0, sizeof(props));

	props.type = BACKLIGHT_RAW;

	props.max_brightness = 128;

	props.brightness = clamp_t(unsigned int, pdata->def_value, 0,

				   props.max_brightness);



	backlight = backlight_device_register(dev_name(&client->dev),

					      &bd->client->dev, bd,

					      &bd6107_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 bd6107_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 bd6107_ids[] = {

	{ "bd6107", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, bd6107_ids);



static struct i2c_driver bd6107_driver = {

	.driver = {

		.name = "bd6107",

	},

	.probe = bd6107_probe,

	.remove = bd6107_remove,

	.id_table = bd6107_ids,

};



module_i2c_driver(bd6107_driver);



MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver");

MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");

MODULE_LICENSE("GPL");

include/linux/platform_data/bd6107.h

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/*

 * bd6107.h - Rohm BD6107 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 __BD6107_H__

#define __BD6107_H__



struct device;



struct bd6107_platform_data {

	struct device *fbdev;

	int reset;			/* Reset GPIO */

	unsigned int def_value;

};



#endif