Commit b148a272 authored by Donghwa Lee's avatar Donghwa Lee Committed by Linus Torvalds
Browse files

backlight/ld9040.c: regulator control in the driver 



This patch supports regulator power control in the driver.  Current ld9040
driver was controlled power on/off sequence by callback function in the
board file.  But, by doing this, there's no need to register lcd power
on/off callback function in the board file.

Signed-off-by: default avatarDonghwa Lee <dh09.lee@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 81178e02

drivers/video/backlight/ld9040.c

+59 −12
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include <linux/lcd.h>

#include <linux/backlight.h>

#include <linux/module.h>

#include <linux/regulator/consumer.h>



#include "ld9040_gamma.h"
@@ -53,8 +54,51 @@ struct ld9040 { 
	struct lcd_device		*ld;

	struct backlight_device		*bd;

	struct lcd_platform_data	*lcd_pd;



	struct mutex			lock;

	bool  enabled;

};



static struct regulator_bulk_data supplies[] = {

	{ .supply = "vdd3", },

	{ .supply = "vci", },

};



static void ld9040_regulator_enable(struct ld9040 *lcd)

{

	int ret = 0;

	struct lcd_platform_data *pd = NULL;



	pd = lcd->lcd_pd;

	mutex_lock(&lcd->lock);

	if (!lcd->enabled) {

		ret = regulator_bulk_enable(ARRAY_SIZE(supplies), supplies);

		if (ret)

			goto out;



		lcd->enabled = true;

	}

	mdelay(pd->power_on_delay);

out:

	mutex_unlock(&lcd->lock);

}



static void ld9040_regulator_disable(struct ld9040 *lcd)

{

	int ret = 0;



	mutex_lock(&lcd->lock);

	if (lcd->enabled) {

		ret = regulator_bulk_disable(ARRAY_SIZE(supplies), supplies);

		if (ret)

			goto out;



		lcd->enabled = false;

	}

out:

	mutex_unlock(&lcd->lock);

}



static const unsigned short seq_swreset[] = {

	0x01, COMMAND_ONLY,

	ENDDEF, 0x00
@@ -532,13 +576,8 @@ static int ld9040_power_on(struct ld9040 *lcd) 
		return -EFAULT;

	}



	if (!pd->power_on) {

		dev_err(lcd->dev, "power_on is NULL.\n");

		return -EFAULT;

	} else {

		pd->power_on(lcd->ld, 1);

		mdelay(pd->power_on_delay);

	}

	/* lcd power on */

	ld9040_regulator_enable(lcd);



	if (!pd->reset) {

		dev_err(lcd->dev, "reset is NULL.\n");
@@ -582,11 +621,8 @@ static int ld9040_power_off(struct ld9040 *lcd) 


	mdelay(pd->power_off_delay);



	if (!pd->power_on) {

		dev_err(lcd->dev, "power_on is NULL.\n");

		return -EFAULT;

	} else

		pd->power_on(lcd->ld, 0);

	/* lcd power off */

	ld9040_regulator_disable(lcd);



	return 0;

}
@@ -693,6 +729,14 @@ static int ld9040_probe(struct spi_device *spi) 
		goto out_free_lcd;

	}



	mutex_init(&lcd->lock);



	ret = regulator_bulk_get(lcd->dev, ARRAY_SIZE(supplies), supplies);

	if (ret) {

		dev_err(lcd->dev, "Failed to get regulators: %d\n", ret);

		goto out_free_lcd;

	}



	ld = lcd_device_register("ld9040", &spi->dev, lcd, &ld9040_lcd_ops);

	if (IS_ERR(ld)) {

		ret = PTR_ERR(ld);
@@ -739,6 +783,8 @@ static int ld9040_probe(struct spi_device *spi) 
out_unregister_lcd:

	lcd_device_unregister(lcd->ld);

out_free_lcd:

	regulator_bulk_free(ARRAY_SIZE(supplies), supplies);



	kfree(lcd);

	return ret;

}
@@ -750,6 +796,7 @@ static int __devexit ld9040_remove(struct spi_device *spi) 
	ld9040_power(lcd, FB_BLANK_POWERDOWN);

	backlight_device_unregister(lcd->bd);

	lcd_device_unregister(lcd->ld);

	regulator_bulk_free(ARRAY_SIZE(supplies), supplies);

	kfree(lcd);



	return 0;

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