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Commit 6552d314 authored by Andrey Smirnov's avatar Andrey Smirnov Committed by Lee Jones
Browse files

backlight: Add RAVE SP backlight driver 



This driver provides access to RAVE SP backlight control
functionality.

Signed-off-by: default avatarAndrey Smirnov <andrew.smirnov@gmail.com>
Acked-by: default avatarDaniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 60cc43fc

drivers/video/backlight/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -467,6 +467,12 @@ config BACKLIGHT_ARCXCNN 
	  If you have an ARCxCnnnn family backlight say Y to enable

	  the backlight driver.



config BACKLIGHT_RAVE_SP

	tristate "RAVE SP Backlight driver"

	depends on RAVE_SP_CORE

	help

	  Support for backlight control on RAVE SP device.



endif # BACKLIGHT_CLASS_DEVICE



endif # BACKLIGHT_LCD_SUPPORT

drivers/video/backlight/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -57,3 +57,4 @@ obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o 
obj-$(CONFIG_BACKLIGHT_TPS65217)	+= tps65217_bl.o

obj-$(CONFIG_BACKLIGHT_WM831X)		+= wm831x_bl.o

obj-$(CONFIG_BACKLIGHT_ARCXCNN) 	+= arcxcnn_bl.o

obj-$(CONFIG_BACKLIGHT_RAVE_SP)		+= rave-sp-backlight.o

drivers/video/backlight/rave-sp-backlight.c

0 → 100644
+82 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+



/*

 * LCD Backlight driver for RAVE SP

 *

 * Copyright (C) 2018 Zodiac Inflight Innovations

 *

 */



#include <linux/backlight.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/mfd/rave-sp.h>

#include <linux/platform_device.h>



#define	RAVE_SP_BACKLIGHT_LCD_EN	BIT(7)



static int rave_sp_backlight_update_status(struct backlight_device *bd)

{

	const struct backlight_properties *p = &bd->props;

	const u8 intensity =

		(p->power == FB_BLANK_UNBLANK) ? p->brightness : 0;

	struct rave_sp *sp = dev_get_drvdata(&bd->dev);

	u8 cmd[] = {

		[0] = RAVE_SP_CMD_SET_BACKLIGHT,

		[1] = 0,

		[2] = intensity ? RAVE_SP_BACKLIGHT_LCD_EN | intensity : 0,

		[3] = 0,

		[4] = 0,

	};



	return rave_sp_exec(sp, cmd, sizeof(cmd), NULL, 0);

}



static const struct backlight_ops rave_sp_backlight_ops = {

	.options	= BL_CORE_SUSPENDRESUME,

	.update_status	= rave_sp_backlight_update_status,

};



static struct backlight_properties rave_sp_backlight_props = {

	.type		= BACKLIGHT_PLATFORM,

	.max_brightness = 100,

	.brightness	= 50,

};



static int rave_sp_backlight_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct backlight_device *bd;



	bd = devm_backlight_device_register(dev, pdev->name, dev->parent,

					    dev_get_drvdata(dev->parent),

					    &rave_sp_backlight_ops,

					    &rave_sp_backlight_props);

	if (IS_ERR(bd))

		return PTR_ERR(bd);



	backlight_update_status(bd);



	return 0;

}



static const struct of_device_id rave_sp_backlight_of_match[] = {

	{ .compatible = "zii,rave-sp-backlight" },

	{}

};



static struct platform_driver rave_sp_backlight_driver = {

	.probe = rave_sp_backlight_probe,

	.driver	= {

		.name = KBUILD_MODNAME,

		.of_match_table = rave_sp_backlight_of_match,

	},

};

module_platform_driver(rave_sp_backlight_driver);



MODULE_DEVICE_TABLE(of, rave_sp_backlight_of_match);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>");

MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>");

MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");

MODULE_DESCRIPTION("RAVE SP Backlight driver");

include/linux/mfd/rave-sp.h

+1 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ enum rave_sp_command { 
	RAVE_SP_CMD_STATUS			= 0xA0,

	RAVE_SP_CMD_SW_WDT			= 0xA1,

	RAVE_SP_CMD_PET_WDT			= 0xA2,

	RAVE_SP_CMD_SET_BACKLIGHT		= 0xA6,

	RAVE_SP_CMD_RESET			= 0xA7,

	RAVE_SP_CMD_RESET_REASON		= 0xA8,