Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight

* 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight:
  backlight: new driver for ADP5520/ADP5501 MFD PMICs
  backlight: extend event support to also support poll()
  backlight/eeepc-laptop: Update the backlight state when we change brightness
  backlight/acpi: Update the backlight state when we change brightness
  backlight: Allow drivers to update the core, and generate events on changes
  backlight: switch to da903x driver to dev_pm_ops
  backlight: Add support for the Avionic Design Xanthos backlight device.
  backlight: spi driver for LMS283GF05 LCD
  backlight: move hp680-bl's probe function to .devinit.text
  backlight: Add support for new Apple machines.
  backlight: mbp_nvidia_bl: add support for MacBookAir 1,1
  backlight: Add WM831x backlight driver

Trivial conflicts due to '#ifdef CONFIG_PM' differences in
drivers/video/backlight/da903x_bl.c

drivers/acpi/video.c

@@ -1986,6 +1986,10 @@ acpi_video_switch_brightness(struct acpi_video_device *device, int event)
 
 	result = acpi_video_device_lcd_set_level(device, level_next);
 
+	if (!result)
+		backlight_force_update(device->backlight,
+				       BACKLIGHT_UPDATE_HOTKEY);
+
 out:
 	if (result)
 		printk(KERN_ERR PREFIX "Failed to switch the brightness\n");

drivers/platform/x86/eeepc-laptop.c

@@ -624,7 +624,7 @@ static int notify_brn(void)
 	struct backlight_device *bd = eeepc_backlight_device;
 	if (bd) {
 		int old = bd->props.brightness;
-		bd->props.brightness = read_brightness(bd);
+		backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);
 		return old;
 	}
 	return -1;

drivers/video/backlight/Kconfig

@@ -31,6 +31,13 @@ config LCD_CORGI
 	  Say y here to support the LCD panels usually found on SHARP
 	  corgi (C7x0) and spitz (Cxx00) models.
 
+config LCD_LMS283GF05
+	tristate "Samsung LMS283GF05 LCD"
+	depends on LCD_CLASS_DEVICE && SPI_MASTER && GENERIC_GPIO
+	help
+	  SPI driver for Samsung LMS283GF05. This provides basic support
+	  for powering the LCD up/down through a sysfs interface.
+
 config LCD_LTV350QV
 	tristate "Samsung LTV350QV LCD Panel"
 	depends on LCD_CLASS_DEVICE && SPI_MASTER
@@ -229,3 +236,29 @@ config BACKLIGHT_SAHARA
 	help
 	  If you have a Tabletkiosk Sahara Touch-iT, say y to enable the
 	  backlight driver.
+
+config BACKLIGHT_WM831X
+	tristate "WM831x PMIC Backlight Driver"
+	depends on BACKLIGHT_CLASS_DEVICE && MFD_WM831X
+	help
+	  If you have a backlight driven by the ISINK and DCDC of a
+	  WM831x PMIC say y to enable the backlight driver for it.
+
+config BACKLIGHT_ADX
+	tristate "Avionic Design Xanthos Backlight Driver"
+	depends on BACKLIGHT_CLASS_DEVICE && ARCH_PXA_ADX
+	default y
+	help
+	  Say Y to enable the backlight driver on Avionic Design Xanthos-based
+	  boards.
+
+config BACKLIGHT_ADP5520
+	tristate "Backlight Driver for ADP5520/ADP5501 using WLED"
+	depends on BACKLIGHT_CLASS_DEVICE && PMIC_ADP5520
+	help
+	  If you have a LCD backlight connected to the BST/BL_SNK output of
+	  ADP5520 or ADP5501, say Y here to enable this driver.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called adp5520_bl.
+

drivers/video/backlight/Makefile

@@ -3,6 +3,7 @@
 obj-$(CONFIG_LCD_CLASS_DEVICE)     += lcd.o
 obj-$(CONFIG_LCD_CORGI)		   += corgi_lcd.o
 obj-$(CONFIG_LCD_HP700)		   += jornada720_lcd.o
+obj-$(CONFIG_LCD_LMS283GF05)	   += lms283gf05.o
 obj-$(CONFIG_LCD_LTV350QV)	   += ltv350qv.o
 obj-$(CONFIG_LCD_ILI9320)	   += ili9320.o
 obj-$(CONFIG_LCD_PLATFORM)	   += platform_lcd.o
@@ -24,4 +25,7 @@ obj-$(CONFIG_BACKLIGHT_DA903X)	+= da903x_bl.o
 obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o
 obj-$(CONFIG_BACKLIGHT_TOSA)	+= tosa_bl.o
 obj-$(CONFIG_BACKLIGHT_SAHARA)	+= kb3886_bl.o
+obj-$(CONFIG_BACKLIGHT_WM831X)	+= wm831x_bl.o
+obj-$(CONFIG_BACKLIGHT_ADX)    += adx_bl.o
+obj-$(CONFIG_BACKLIGHT_ADP5520)	+= adp5520_bl.o
 

drivers/video/backlight/adx_bl.c

+/*
+ * linux/drivers/video/backlight/adx.c
+ *
+ * Copyright (C) 2009 Avionic Design GmbH
+ *
+ * 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.
+ *
+ * Written by Thierry Reding <thierry.reding@avionic-design.de>
+ */
+
+#include <linux/backlight.h>
+#include <linux/fb.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+/* register definitions */
+#define ADX_BACKLIGHT_CONTROL		0x00
+#define ADX_BACKLIGHT_CONTROL_ENABLE	(1 << 0)
+#define ADX_BACKLIGHT_BRIGHTNESS	0x08
+#define ADX_BACKLIGHT_STATUS		0x10
+#define ADX_BACKLIGHT_ERROR		0x18
+
+struct adxbl {
+	void __iomem *base;
+};
+
+static int adx_backlight_update_status(struct backlight_device *bldev)
+{
+	struct adxbl *bl = bl_get_data(bldev);
+	u32 value;
+
+	value = bldev->props.brightness;
+	writel(value, bl->base + ADX_BACKLIGHT_BRIGHTNESS);
+
+	value = readl(bl->base + ADX_BACKLIGHT_CONTROL);
+
+	if (bldev->props.state & BL_CORE_FBBLANK)
+		value &= ~ADX_BACKLIGHT_CONTROL_ENABLE;
+	else
+		value |= ADX_BACKLIGHT_CONTROL_ENABLE;
+
+	writel(value, bl->base + ADX_BACKLIGHT_CONTROL);
+
+	return 0;
+}
+
+static int adx_backlight_get_brightness(struct backlight_device *bldev)
+{
+	struct adxbl *bl = bl_get_data(bldev);
+	u32 brightness;
+
+	brightness = readl(bl->base + ADX_BACKLIGHT_BRIGHTNESS);
+	return brightness & 0xff;
+}
+
+static int adx_backlight_check_fb(struct fb_info *fb)
+{
+	return 1;
+}
+
+static struct backlight_ops adx_backlight_ops = {
+	.options = 0,
+	.update_status = adx_backlight_update_status,
+	.get_brightness = adx_backlight_get_brightness,
+	.check_fb = adx_backlight_check_fb,
+};
+
+static int __devinit adx_backlight_probe(struct platform_device *pdev)
+{
+	struct backlight_device *bldev;
+	struct resource *res;
+	struct adxbl *bl;
+	int ret = 0;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		ret = -ENXIO;
+		goto out;
+	}
+
+	res = devm_request_mem_region(&pdev->dev, res->start,
+			resource_size(res), res->name);
+	if (!res) {
+		ret = -ENXIO;
+		goto out;
+	}
+
+	bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL);
+	if (!bl) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	bl->base = devm_ioremap_nocache(&pdev->dev, res->start,
+			resource_size(res));
+	if (!bl->base) {
+		ret = -ENXIO;
+		goto out;
+	}
+
+	bldev = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, bl,
+			&adx_backlight_ops);
+	if (!bldev) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	bldev->props.max_brightness = 0xff;
+	bldev->props.brightness = 0xff;
+	bldev->props.power = FB_BLANK_UNBLANK;
+
+	platform_set_drvdata(pdev, bldev);
+
+out:
+	return ret;
+}
+
+static int __devexit adx_backlight_remove(struct platform_device *pdev)
+{
+	struct backlight_device *bldev;
+	int ret = 0;
+
+	bldev = platform_get_drvdata(pdev);
+	bldev->props.power = FB_BLANK_UNBLANK;
+	bldev->props.brightness = 0xff;
+	backlight_update_status(bldev);
+	backlight_device_unregister(bldev);
+	platform_set_drvdata(pdev, NULL);
+
+	return ret;
+}
+
+#ifdef CONFIG_PM
+static int adx_backlight_suspend(struct platform_device *pdev,
+		pm_message_t state)
+{
+	return 0;
+}
+
+static int adx_backlight_resume(struct platform_device *pdev)
+{
+	return 0;
+}
+#else
+#define adx_backlight_suspend NULL
+#define adx_backlight_resume NULL
+#endif
+
+static struct platform_driver adx_backlight_driver = {
+	.probe = adx_backlight_probe,
+	.remove = __devexit_p(adx_backlight_remove),
+	.suspend = adx_backlight_suspend,
+	.resume = adx_backlight_resume,
+	.driver = {
+		.name = "adx-backlight",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init adx_backlight_init(void)
+{
+	return platform_driver_register(&adx_backlight_driver);
+}
+
+static void __exit adx_backlight_exit(void)
+{
+	platform_driver_unregister(&adx_backlight_driver);
+}
+
+module_init(adx_backlight_init);
+module_exit(adx_backlight_exit);
+
+MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
+MODULE_DESCRIPTION("Avionic Design Xanthos Backlight Driver");
+MODULE_LICENSE("GPL v2");

drivers/video/backlight/backlight.c

@@ -73,6 +73,27 @@ static inline void backlight_unregister_fb(struct backlight_device *bd)
 }
 #endif /* CONFIG_FB */
 
+static void backlight_generate_event(struct backlight_device *bd,
+				     enum backlight_update_reason reason)
+{
+	char *envp[2];
+
+	switch (reason) {
+	case BACKLIGHT_UPDATE_SYSFS:
+		envp[0] = "SOURCE=sysfs";
+		break;
+	case BACKLIGHT_UPDATE_HOTKEY:
+		envp[0] = "SOURCE=hotkey";
+		break;
+	default:
+		envp[0] = "SOURCE=unknown";
+		break;
+	}
+	envp[1] = NULL;
+	kobject_uevent_env(&bd->dev.kobj, KOBJ_CHANGE, envp);
+	sysfs_notify(&bd->dev.kobj, NULL, "actual_brightness");
+}
+
 static ssize_t backlight_show_power(struct device *dev,
 		struct device_attribute *attr,char *buf)
 {
@@ -142,6 +163,8 @@ static ssize_t backlight_store_brightness(struct device *dev,
 	}
 	mutex_unlock(&bd->ops_lock);
 
+	backlight_generate_event(bd, BACKLIGHT_UPDATE_SYSFS);
+
 	return rc;
 }
 
@@ -213,6 +236,25 @@ static struct device_attribute bl_device_attributes[] = {
 	__ATTR_NULL,
 };
 
+/**
+ * backlight_force_update - tell the backlight subsystem that hardware state
+ *   has changed
+ * @bd: the backlight device to update
+ *
+ * Updates the internal state of the backlight in response to a hardware event,
+ * and generate a uevent to notify userspace
+ */
+void backlight_force_update(struct backlight_device *bd,
+			    enum backlight_update_reason reason)
+{
+	mutex_lock(&bd->ops_lock);
+	if (bd->ops && bd->ops->get_brightness)
+		bd->props.brightness = bd->ops->get_brightness(bd);
+	mutex_unlock(&bd->ops_lock);
+	backlight_generate_event(bd, reason);
+}
+EXPORT_SYMBOL(backlight_force_update);
+
 /**
  * backlight_device_register - create and register a new object of
  *   backlight_device class.

drivers/video/backlight/hp680_bl.c

@@ -103,7 +103,7 @@ static struct backlight_ops hp680bl_ops = {
 	.update_status  = hp680bl_set_intensity,
 };
 
-static int __init hp680bl_probe(struct platform_device *pdev)
+static int __devinit hp680bl_probe(struct platform_device *pdev)
 {
 	struct backlight_device *bd;
 

drivers/video/backlight/lms283gf05.c

+/*
+ * lms283gf05.c -- support for Samsung LMS283GF05 LCD
+ *
+ * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.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/device.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/lcd.h>
+
+#include <linux/spi/spi.h>
+#include <linux/spi/lms283gf05.h>
+
+struct lms283gf05_state {
+	struct spi_device	*spi;
+	struct lcd_device	*ld;
+};
+
+struct lms283gf05_seq {
+	unsigned char		reg;
+	unsigned short		value;
+	unsigned char		delay;
+};
+
+/* Magic sequences supplied by manufacturer, for details refer to datasheet */
+static struct lms283gf05_seq disp_initseq[] = {
+	/* REG, VALUE, DELAY */
+	{ 0x07, 0x0000, 0 },
+	{ 0x13, 0x0000, 10 },
+
+	{ 0x11, 0x3004, 0 },
+	{ 0x14, 0x200F, 0 },
+	{ 0x10, 0x1a20, 0 },
+	{ 0x13, 0x0040, 50 },
+
+	{ 0x13, 0x0060, 0 },
+	{ 0x13, 0x0070, 200 },
+
+	{ 0x01, 0x0127, 0 },
+	{ 0x02,	0x0700, 0 },
+	{ 0x03, 0x1030, 0 },
+	{ 0x08, 0x0208, 0 },
+	{ 0x0B, 0x0620, 0 },
+	{ 0x0C, 0x0110, 0 },
+	{ 0x30, 0x0120, 0 },
+	{ 0x31, 0x0127, 0 },
+	{ 0x32, 0x0000, 0 },
+	{ 0x33, 0x0503, 0 },
+	{ 0x34, 0x0727, 0 },
+	{ 0x35, 0x0124, 0 },
+	{ 0x36, 0x0706, 0 },
+	{ 0x37, 0x0701, 0 },
+	{ 0x38, 0x0F00, 0 },
+	{ 0x39, 0x0F00, 0 },
+	{ 0x40, 0x0000, 0 },
+	{ 0x41, 0x0000, 0 },
+	{ 0x42, 0x013f, 0 },
+	{ 0x43, 0x0000, 0 },
+	{ 0x44, 0x013f, 0 },
+	{ 0x45, 0x0000, 0 },
+	{ 0x46, 0xef00, 0 },
+	{ 0x47, 0x013f, 0 },
+	{ 0x48, 0x0000, 0 },
+	{ 0x07, 0x0015, 30 },
+
+	{ 0x07, 0x0017, 0 },
+
+	{ 0x20, 0x0000, 0 },
+	{ 0x21, 0x0000, 0 },
+	{ 0x22, 0x0000, 0 }
+};
+
+static struct lms283gf05_seq disp_pdwnseq[] = {
+	{ 0x07, 0x0016, 30 },
+
+	{ 0x07, 0x0004, 0 },
+	{ 0x10, 0x0220, 20 },
+
+	{ 0x13, 0x0060, 50 },
+
+	{ 0x13, 0x0040, 50 },
+
+	{ 0x13, 0x0000, 0 },
+	{ 0x10, 0x0000, 0 }
+};
+
+
+static void lms283gf05_reset(unsigned long gpio, bool inverted)
+{
+	gpio_set_value(gpio, !inverted);
+	mdelay(100);
+	gpio_set_value(gpio, inverted);
+	mdelay(20);
+	gpio_set_value(gpio, !inverted);
+	mdelay(20);
+}
+
+static void lms283gf05_toggle(struct spi_device *spi,
+			struct lms283gf05_seq *seq, int sz)
+{
+	char buf[3];
+	int i;
+
+	for (i = 0; i < sz; i++) {
+		buf[0] = 0x74;
+		buf[1] = 0x00;
+		buf[2] = seq[i].reg;
+		spi_write(spi, buf, 3);
+
+		buf[0] = 0x76;
+		buf[1] = seq[i].value >> 8;
+		buf[2] = seq[i].value & 0xff;
+		spi_write(spi, buf, 3);
+
+		mdelay(seq[i].delay);
+	}
+}
+
+static int lms283gf05_power_set(struct lcd_device *ld, int power)
+{
+	struct lms283gf05_state *st = lcd_get_data(ld);
+	struct spi_device *spi = st->spi;
+	struct lms283gf05_pdata *pdata = spi->dev.platform_data;
+
+	if (power) {
+		if (pdata)
+			lms283gf05_reset(pdata->reset_gpio,
+					pdata->reset_inverted);
+		lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
+	} else {
+		lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
+		if (pdata)
+			gpio_set_value(pdata->reset_gpio,
+					pdata->reset_inverted);
+	}
+
+	return 0;
+}
+
+static struct lcd_ops lms_ops = {
+	.set_power	= lms283gf05_power_set,
+	.get_power	= NULL,
+};
+
+static int __devinit lms283gf05_probe(struct spi_device *spi)
+{
+	struct lms283gf05_state *st;
+	struct lms283gf05_pdata *pdata = spi->dev.platform_data;
+	struct lcd_device *ld;
+	int ret = 0;
+
+	if (pdata != NULL) {
+		ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET");
+		if (ret)
+			return ret;
+
+		ret = gpio_direction_output(pdata->reset_gpio,
+						!pdata->reset_inverted);
+		if (ret)
+			goto err;
+	}
+
+	st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL);
+	if (st == NULL) {
+		dev_err(&spi->dev, "No memory for device state\n");
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops);
+	if (IS_ERR(ld)) {
+		ret = PTR_ERR(ld);
+		goto err2;
+	}
+
+	st->spi = spi;
+	st->ld = ld;
+
+	dev_set_drvdata(&spi->dev, st);
+
+	/* kick in the LCD */
+	if (pdata)
+		lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
+	lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
+
+	return 0;
+
+err2:
+	kfree(st);
+err:
+	if (pdata != NULL)
+		gpio_free(pdata->reset_gpio);
+
+	return ret;
+}
+
+static int __devexit lms283gf05_remove(struct spi_device *spi)
+{
+	struct lms283gf05_state *st = dev_get_drvdata(&spi->dev);
+	struct lms283gf05_pdata *pdata = st->spi->dev.platform_data;
+
+	lcd_device_unregister(st->ld);
+
+	if (pdata != NULL)
+		gpio_free(pdata->reset_gpio);
+
+	kfree(st);
+
+	return 0;
+}
+
+static struct spi_driver lms283gf05_driver = {
+	.driver = {
+		.name	= "lms283gf05",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= lms283gf05_probe,
+	.remove		= __devexit_p(lms283gf05_remove),
+};
+
+static __init int lms283gf05_init(void)
+{
+	return spi_register_driver(&lms283gf05_driver);
+}
+
+static __exit void lms283gf05_exit(void)
+{
+	spi_unregister_driver(&lms283gf05_driver);
+}
+
+module_init(lms283gf05_init);
+module_exit(lms283gf05_exit);
+
+MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
+MODULE_DESCRIPTION("LCD283GF05 LCD");
+MODULE_LICENSE("GPL v2");

drivers/video/backlight/mbp_nvidia_bl.c

@@ -164,6 +164,15 @@ static const struct dmi_system_id __initdata mbp_device_table[] = {
 		},
 		.driver_data	= (void *)&intel_chipset_data,
 	},
+	{
+		.callback	= mbp_dmi_match,
+		.ident		= "MacBookAir 1,1",
+		.matches	= {
+			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir1,1"),
+		},
+		.driver_data	= (void *)&intel_chipset_data,
+	},
 	{
 		.callback	= mbp_dmi_match,
 		.ident		= "MacBook 5,1",
@@ -173,6 +182,15 @@ static const struct dmi_system_id __initdata mbp_device_table[] = {
 		},
 		.driver_data	= (void *)&nvidia_chipset_data,
 	},
+	{
+		.callback	= mbp_dmi_match,
+		.ident		= "MacBook 5,2",
+		.matches	= {
+			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,2"),
+		},
+		.driver_data	= (void *)&nvidia_chipset_data,
+	},
 	{
 		.callback	= mbp_dmi_match,
 		.ident		= "MacBookAir 2,1",
@@ -191,6 +209,24 @@ static const struct dmi_system_id __initdata mbp_device_table[] = {
 		},
 		.driver_data	= (void *)&nvidia_chipset_data,
 	},
+	{
+		.callback	= mbp_dmi_match,
+		.ident		= "MacBookPro 5,2",
+		.matches	= {
+			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,2"),
+		},
+		.driver_data	= (void *)&nvidia_chipset_data,
+	},
+	{
+		.callback	= mbp_dmi_match,
+		.ident		= "MacBookPro 5,5",
+		.matches	= {
+			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,5"),
+		},
+		.driver_data	= (void *)&nvidia_chipset_data,
+	},
 	{ }
 };
 

drivers/video/backlight/wm831x_bl.c

+/*
+ * Backlight driver for Wolfson Microelectronics WM831x PMICs
+ *
+ * Copyright 2009 Wolfson Microelectonics plc
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+
+#include <linux/mfd/wm831x/core.h>
+#include <linux/mfd/wm831x/pdata.h>
+#include <linux/mfd/wm831x/regulator.h>
+
+struct wm831x_backlight_data {
+	struct wm831x *wm831x;
+	int isink_reg;
+	int current_brightness;
+};
+
+static int wm831x_backlight_set(struct backlight_device *bl, int brightness)
+{
+	struct wm831x_backlight_data *data = bl_get_data(bl);
+	struct wm831x *wm831x = data->wm831x;
+	int power_up = !data->current_brightness && brightness;
+	int power_down = data->current_brightness && !brightness;
+	int ret;
+
+	if (power_up) {
+		/* Enable the ISINK */
+		ret = wm831x_set_bits(wm831x, data->isink_reg,
+				      WM831X_CS1_ENA, WM831X_CS1_ENA);
+		if (ret < 0)
+			goto err;
+
+		/* Enable the DC-DC */
+		ret = wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE,
+				      WM831X_DC4_ENA, WM831X_DC4_ENA);
+		if (ret < 0)
+			goto err;
+	}
+
+	if (power_down) {
+		/* DCDC first */
+		ret = wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE,
+				      WM831X_DC4_ENA, 0);
+		if (ret < 0)
+			goto err;
+
+		/* ISINK */
+		ret = wm831x_set_bits(wm831x, data->isink_reg,
+				      WM831X_CS1_DRIVE | WM831X_CS1_ENA, 0);
+		if (ret < 0)
+			goto err;
+	}
+
+	/* Set the new brightness */
+	ret = wm831x_set_bits(wm831x, data->isink_reg,
+			      WM831X_CS1_ISEL_MASK, brightness);
+	if (ret < 0)
+		goto err;
+
+	if (power_up) {
+		/* Drive current through the ISINK */
+		ret = wm831x_set_bits(wm831x, data->isink_reg,
+				      WM831X_CS1_DRIVE, WM831X_CS1_DRIVE);
+		if (ret < 0)
+			return ret;
+	}
+
+	data->current_brightness = brightness;
+
+	return 0;
+
+err:
+	/* If we were in the middle of a power transition always shut down
+	 * for safety.
+	 */
+	if (power_up || power_down) {
+		wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, WM831X_DC4_ENA, 0);
+		wm831x_set_bits(wm831x, data->isink_reg, WM831X_CS1_ENA, 0);
+	}
+
+	return ret;
+}
+
+static int wm831x_backlight_update_status(struct backlight_device *bl)
+{
+	int brightness = bl->props.brightness;
+
+	if (bl->props.power != FB_BLANK_UNBLANK)
+		brightness = 0;
+
+	if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+		brightness = 0;
+
+	if (bl->props.state & BL_CORE_SUSPENDED)
+		brightness = 0;
+
+	return wm831x_backlight_set(bl, brightness);
+}
+
+static int wm831x_backlight_get_brightness(struct backlight_device *bl)
+{
+	struct wm831x_backlight_data *data = bl_get_data(bl);
+	return data->current_brightness;
+}
+
+static struct backlight_ops wm831x_backlight_ops = {
+	.options = BL_CORE_SUSPENDRESUME,
+	.update_status	= wm831x_backlight_update_status,
+	.get_brightness	= wm831x_backlight_get_brightness,
+};
+
+static int wm831x_backlight_probe(struct platform_device *pdev)
+{
+	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+	struct wm831x_pdata *wm831x_pdata;
+	struct wm831x_backlight_pdata *pdata;
+	struct wm831x_backlight_data *data;
+	struct backlight_device *bl;
+	int ret, i, max_isel, isink_reg, dcdc_cfg;
+
+	/* We need platform data */
+	if (pdev->dev.parent->platform_data) {
+		wm831x_pdata = pdev->dev.parent->platform_data;
+		pdata = wm831x_pdata->backlight;
+	} else {
+		pdata = NULL;
+	}
+
+	if (!pdata) {
+		dev_err(&pdev->dev, "No platform data supplied\n");
+		return -EINVAL;
+	}
+
+	/* Figure out the maximum current we can use */
+	for (i = 0; i < WM831X_ISINK_MAX_ISEL; i++) {
+		if (wm831x_isinkv_values[i] > pdata->max_uA)
+			break;
+	}
+
+	if (i == 0) {
+		dev_err(&pdev->dev, "Invalid max_uA: %duA\n", pdata->max_uA);
+		return -EINVAL;
+	}
+	max_isel = i - 1;
+
+	if (pdata->max_uA != wm831x_isinkv_values[max_isel])
+		dev_warn(&pdev->dev,
+			 "Maximum current is %duA not %duA as requested\n",
+			 wm831x_isinkv_values[max_isel], pdata->max_uA);
+
+	switch (pdata->isink) {
+	case 1:
+		isink_reg = WM831X_CURRENT_SINK_1;
+		dcdc_cfg = 0;
+		break;
+	case 2:
+		isink_reg = WM831X_CURRENT_SINK_2;
+		dcdc_cfg = WM831X_DC4_FBSRC;
+		break;
+	default:
+		dev_err(&pdev->dev, "Invalid ISINK %d\n", pdata->isink);
+		return -EINVAL;
+	}
+
+	/* Configure the ISINK to use for feedback */
+	ret = wm831x_reg_unlock(wm831x);
+	if (ret < 0)
+		return ret;
+
+	ret = wm831x_set_bits(wm831x, WM831X_DC4_CONTROL, WM831X_DC4_FBSRC,
+			      dcdc_cfg);
+
+	wm831x_reg_lock(wm831x);
+	if (ret < 0)
+		return ret;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
+
+	data->wm831x = wm831x;
+	data->current_brightness = 0;
+	data->isink_reg = isink_reg;
+
+	bl = backlight_device_register("wm831x", &pdev->dev,
+			data, &wm831x_backlight_ops);
+	if (IS_ERR(bl)) {
+		dev_err(&pdev->dev, "failed to register backlight\n");
+		kfree(data);
+		return PTR_ERR(bl);
+	}
+
+	bl->props.max_brightness = max_isel;
+	bl->props.brightness = max_isel;
+
+	platform_set_drvdata(pdev, bl);
+
+	/* Disable the DCDC if it was started so we can bootstrap */
+	wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, WM831X_DC4_ENA, 0);
+
+
+	backlight_update_status(bl);
+
+	return 0;
+}
+
+static int wm831x_backlight_remove(struct platform_device *pdev)
+{
+	struct backlight_device *bl = platform_get_drvdata(pdev);
+	struct wm831x_backlight_data *data = bl_get_data(bl);
+
+	backlight_device_unregister(bl);
+	kfree(data);
+	return 0;
+}
+
+static struct platform_driver wm831x_backlight_driver = {
+	.driver		= {
+		.name	= "wm831x-backlight",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= wm831x_backlight_probe,
+	.remove		= wm831x_backlight_remove,
+};
+
+static int __init wm831x_backlight_init(void)
+{
+	return platform_driver_register(&wm831x_backlight_driver);
+}
+module_init(wm831x_backlight_init);
+
+static void __exit wm831x_backlight_exit(void)
+{
+	platform_driver_unregister(&wm831x_backlight_driver);
+}
+module_exit(wm831x_backlight_exit);
+
+MODULE_DESCRIPTION("Backlight Driver for WM831x PMICs");
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm831x-backlight");

include/linux/backlight.h

@@ -27,6 +27,11 @@
  * Any other use of the locks below is probably wrong.
  */
 
+enum backlight_update_reason {
+	BACKLIGHT_UPDATE_HOTKEY,
+	BACKLIGHT_UPDATE_SYSFS,
+};
+
 struct backlight_device;
 struct fb_info;
 
@@ -100,6 +105,8 @@ static inline void backlight_update_status(struct backlight_device *bd)
 extern struct backlight_device *backlight_device_register(const char *name,
 	struct device *dev, void *devdata, struct backlight_ops *ops);
 extern void backlight_device_unregister(struct backlight_device *bd);
+extern void backlight_force_update(struct backlight_device *bd,
+				   enum backlight_update_reason reason);
 
 #define to_backlight_device(obj) container_of(obj, struct backlight_device, dev)
 

include/linux/spi/lms283gf05.h

+/*
+ * lms283gf05.h - Platform glue for Samsung LMS283GF05 LCD
+ *
+ * Copyright (C) 2009 Marek Vasut <marek.vasut@gmail.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.
+ *
+ * This program 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 program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#ifndef _INCLUDE_LINUX_SPI_LMS283GF05_H_
+#define _INCLUDE_LINUX_SPI_LMS283GF05_H_
+
+struct lms283gf05_pdata {
+	unsigned long	reset_gpio;
+	bool		reset_inverted;
+};
+
+#endif /* _INCLUDE_LINUX_SPI_LMS283GF05_H_ */