Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 2188a988 authored by Linus Walleij's avatar Linus Walleij Committed by Lee Jones
Browse files

backlight: Add driver for iPAQ micro backlight 



This adds a driver for the backlight controlled by the microcontroller
on the Compaq iPAQ series of handheld computers: h3100, h3600
and h3700.

Acked-by: default avatarJingoo Han <jg1.han@samsung.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent ff9c5422

drivers/video/backlight/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -207,6 +207,15 @@ config BACKLIGHT_GENERIC 
	  known as the Corgi backlight driver. If you have a Sharp Zaurus

	  SL-C7xx, SL-Cxx00 or SL-6000x say y.



config BACKLIGHT_IPAQ_MICRO

	tristate "iPAQ microcontroller backlight driver"

	depends on MFD_IPAQ_MICRO

	default y

	help

	  Say y to enable the backlight driver for Compaq iPAQ handheld

	  computers. Say yes if you have one of the h3100/h3600/h3700

	  machines.



config BACKLIGHT_LM3533

	tristate "Backlight Driver for LM3533"

	depends on BACKLIGHT_CLASS_DEVICE

drivers/video/backlight/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ obj-$(CONFIG_BACKLIGHT_GENERIC) += generic_bl.o 
obj-$(CONFIG_BACKLIGHT_GPIO)		+= gpio_backlight.o

obj-$(CONFIG_BACKLIGHT_HP680)		+= hp680_bl.o

obj-$(CONFIG_BACKLIGHT_HP700)		+= jornada720_bl.o

obj-$(CONFIG_BACKLIGHT_IPAQ_MICRO)	+= ipaq_micro_bl.o

obj-$(CONFIG_BACKLIGHT_LM3533)		+= lm3533_bl.o

obj-$(CONFIG_BACKLIGHT_LM3630A)		+= lm3630a_bl.o

obj-$(CONFIG_BACKLIGHT_LM3639)		+= lm3639_bl.o

drivers/video/backlight/ipaq_micro_bl.c

0 → 100644
+83 −0
Original line number Diff line number Diff line 
/*

 * 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.

 *

 * iPAQ microcontroller backlight support

 * Author : Linus Walleij <linus.walleij@linaro.org>

 */



#include <linux/backlight.h>

#include <linux/err.h>

#include <linux/fb.h>

#include <linux/init.h>

#include <linux/mfd/ipaq-micro.h>

#include <linux/module.h>

#include <linux/platform_device.h>



static int micro_bl_update_status(struct backlight_device *bd)

{

	struct ipaq_micro *micro = dev_get_drvdata(&bd->dev);

	int intensity = bd->props.brightness;

	struct ipaq_micro_msg msg = {

		.id = MSG_BACKLIGHT,

		.tx_len = 3,

	};



	if (bd->props.power != FB_BLANK_UNBLANK)

		intensity = 0;

	if (bd->props.state & (BL_CORE_FBBLANK | BL_CORE_SUSPENDED))

		intensity = 0;



	/*

	 * Message format:

	 * Byte 0: backlight instance (usually 1)

	 * Byte 1: on/off

	 * Byte 2: intensity, 0-255

	 */

	msg.tx_data[0] = 0x01;

	msg.tx_data[1] = intensity > 0 ? 1 : 0;

	msg.tx_data[2] = intensity;

	return ipaq_micro_tx_msg_sync(micro, &msg);

}



static const struct backlight_ops micro_bl_ops = {

	.options = BL_CORE_SUSPENDRESUME,

	.update_status  = micro_bl_update_status,

};



static struct backlight_properties micro_bl_props = {

	.type = BACKLIGHT_RAW,

	.max_brightness = 255,

	.power = FB_BLANK_UNBLANK,

	.brightness = 64,

};



static int micro_backlight_probe(struct platform_device *pdev)

{

	struct backlight_device *bd;

	struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);



	bd = devm_backlight_device_register(&pdev->dev, "ipaq-micro-backlight",

					    &pdev->dev, micro, &micro_bl_ops,

					    &micro_bl_props);

	if (IS_ERR(bd))

		return PTR_ERR(bd);



	platform_set_drvdata(pdev, bd);

	backlight_update_status(bd);



	return 0;

}



struct platform_driver micro_backlight_device_driver = {

	.driver = {

		.name    = "ipaq-micro-backlight",

	},

	.probe   = micro_backlight_probe,

};

module_platform_driver(micro_backlight_device_driver);



MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("driver for iPAQ Atmel micro backlight");

MODULE_ALIAS("platform:ipaq-micro-backlight");