Commit ec072b0f authored by Andrzej Zaborowski's avatar Andrzej Zaborowski Committed by Richard Purdie
Browse files

backlight: Add OMAP1 PWL backlight driver 



This adds the OMAP1 PWL-based LCD backlight driver.  It's been in the OMAP
tree for some time.  Note that OMAP2 can do similar things with the generic
timers which have PWM outputs.  Such timers are more generic than the PWL
found on OMAP1 chips, but have a different EMI profile because they aren't
driven by a pseudorandom number generator.

[akpm@linux-foundation.org: cleanups]
Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarAndrzej Zaborowski <balrogg@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarRichard Purdie <rpurdie@rpsys.net>
parent 51552453

drivers/video/backlight/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -80,6 +80,15 @@ config BACKLIGHT_LOCOMO 
	  If you have a Sharp Zaurus SL-5500 (Collie) or SL-5600 (Poodle) say y to

	  enable the LCD/backlight driver.



config BACKLIGHT_OMAP1

	tristate "OMAP1 PWL-based LCD Backlight"

	depends on BACKLIGHT_CLASS_DEVICE && ARCH_OMAP1

	default y

	help

	  This driver controls the LCD backlight level and power for

	  the PWL module of OMAP1 processors.  Say Y if your board

	  uses this hardware.



config BACKLIGHT_HP680

	tristate "HP Jornada 680 Backlight Driver"

	depends on BACKLIGHT_CLASS_DEVICE && SH_HP6XX

drivers/video/backlight/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -7,5 +7,6 @@ obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o 
obj-$(CONFIG_BACKLIGHT_CORGI)	+= corgi_bl.o

obj-$(CONFIG_BACKLIGHT_HP680)	+= hp680_bl.o

obj-$(CONFIG_BACKLIGHT_LOCOMO)	+= locomolcd.o

obj-$(CONFIG_BACKLIGHT_OMAP1)	+= omap1_bl.o

obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o

obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o

drivers/video/backlight/omap1_bl.c

0 → 100644
+210 −0
Original line number Diff line number Diff line 
/*

 * Backlight driver for OMAP based boards.

 *

 * Copyright (c) 2006 Andrzej Zaborowski  <balrog@zabor.org>

 *

 * This package is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This package is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this package; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */



#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/fb.h>

#include <linux/backlight.h>



#include <asm/arch/hardware.h>

#include <asm/arch/board.h>

#include <asm/arch/mux.h>



#define OMAPBL_MAX_INTENSITY		0xff



struct omap_backlight {

	int powermode;

	int current_intensity;



	struct device *dev;

	struct omap_backlight_config *pdata;

};



static void inline omapbl_send_intensity(int intensity)

{

	omap_writeb(intensity, OMAP_PWL_ENABLE);

}



static void inline omapbl_send_enable(int enable)

{

	omap_writeb(enable, OMAP_PWL_CLK_ENABLE);

}



static void omapbl_blank(struct omap_backlight *bl, int mode)

{

	if (bl->pdata->set_power)

		bl->pdata->set_power(bl->dev, mode);



	switch (mode) {

	case FB_BLANK_NORMAL:

	case FB_BLANK_VSYNC_SUSPEND:

	case FB_BLANK_HSYNC_SUSPEND:

	case FB_BLANK_POWERDOWN:

		omapbl_send_intensity(0);

		omapbl_send_enable(0);

		break;



	case FB_BLANK_UNBLANK:

		omapbl_send_intensity(bl->current_intensity);

		omapbl_send_enable(1);

		break;

	}

}



#ifdef CONFIG_PM

static int omapbl_suspend(struct platform_device *pdev, pm_message_t state)

{

	struct backlight_device *dev = platform_get_drvdata(pdev);

	struct omap_backlight *bl = dev_get_drvdata(&dev->dev);



	omapbl_blank(bl, FB_BLANK_POWERDOWN);

	return 0;

}



static int omapbl_resume(struct platform_device *pdev)

{

	struct backlight_device *dev = platform_get_drvdata(pdev);

	struct omap_backlight *bl = dev_get_drvdata(&dev->dev);



	omapbl_blank(bl, bl->powermode);

	return 0;

}

#else

#define omapbl_suspend	NULL

#define omapbl_resume	NULL

#endif



static int omapbl_set_power(struct backlight_device *dev, int state)

{

	struct omap_backlight *bl = dev_get_drvdata(&dev->dev);



	omapbl_blank(bl, state);

	bl->powermode = state;



	return 0;

}



static int omapbl_update_status(struct backlight_device *dev)

{

	struct omap_backlight *bl = dev_get_drvdata(&dev->dev);



	if (bl->current_intensity != dev->props.brightness) {

		if (bl->powermode == FB_BLANK_UNBLANK)

			omapbl_send_intensity(dev->props.brightness);

		bl->current_intensity = dev->props.brightness;

	}



	if (dev->props.fb_blank != bl->powermode)

		omapbl_set_power(dev, dev->props.fb_blank);



	return 0;

}



static int omapbl_get_intensity(struct backlight_device *dev)

{

	struct omap_backlight *bl = dev_get_drvdata(&dev->dev);

	return bl->current_intensity;

}



static struct backlight_ops omapbl_ops = {

	.get_brightness = omapbl_get_intensity,

	.update_status  = omapbl_update_status,

};



static int omapbl_probe(struct platform_device *pdev)

{

	struct backlight_device *dev;

	struct omap_backlight *bl;

	struct omap_backlight_config *pdata = pdev->dev.platform_data;



	if (!pdata)

		return -ENXIO;



	omapbl_ops.check_fb = pdata->check_fb;



	bl = kzalloc(sizeof(struct omap_backlight), GFP_KERNEL);

	if (unlikely(!bl))

		return -ENOMEM;



	dev = backlight_device_register("omap-bl", &pdev->dev, bl, &omapbl_ops);

	if (IS_ERR(dev)) {

		kfree(bl);

		return PTR_ERR(dev);

	}



	bl->powermode = FB_BLANK_POWERDOWN;

	bl->current_intensity = 0;



	bl->pdata = pdata;

	bl->dev = &pdev->dev;



	platform_set_drvdata(pdev, dev);



	omap_cfg_reg(PWL);	/* Conflicts with UART3 */



	dev->props.fb_blank = FB_BLANK_UNBLANK;

	dev->props.max_brightness = OMAPBL_MAX_INTENSITY;

	dev->props.brightness = pdata->default_intensity;

	omapbl_update_status(dev);



	printk(KERN_INFO "OMAP LCD backlight initialised\n");



	return 0;

}



static int omapbl_remove(struct platform_device *pdev)

{

	struct backlight_device *dev = platform_get_drvdata(pdev);

	struct omap_backlight *bl = dev_get_drvdata(&dev->dev);



	backlight_device_unregister(dev);

	kfree(bl);



	return 0;

}



static struct platform_driver omapbl_driver = {

	.probe		= omapbl_probe,

	.remove		= omapbl_remove,

	.suspend	= omapbl_suspend,

	.resume		= omapbl_resume,

	.driver		= {

		.name	= "omap-bl",

	},

};



static int __init omapbl_init(void)

{

	return platform_driver_register(&omapbl_driver);

}



static void __exit omapbl_exit(void)

{

	platform_driver_unregister(&omapbl_driver);

}



module_init(omapbl_init);

module_exit(omapbl_exit);



MODULE_AUTHOR("Andrzej Zaborowski <balrog@zabor.org>");

MODULE_DESCRIPTION("OMAP LCD Backlight driver");

MODULE_LICENSE("GPL");

CRA Git | Maintained and supported by SUSTech CRA and CCSE