[PATCH] backlight: LOCOMO Backlight Driver updates

Add backlight intensity control to the LOCOMO lcd/backlight driver using the
backlight class and add basic power management support.

This is a reimplementation and improvement of patches by John Lenz and Pavel
Machek

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 25 insertions, 20 deletions

diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c
index a7dc1370695b..0dafba3a701d 100644
--- a/arch/arm/common/locomo.c
+++ b/arch/arm/common/locomo.c
@@ -629,21 +629,6 @@ static int locomo_resume(struct platform_device *dev)
 #endif
 
 
-#define LCM_ALC_EN      0x8000
-
-void frontlight_set(struct locomo *lchip, int duty, int vr, int bpwf)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(&lchip->lock, flags);
-        locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
-        udelay(100);
-        locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
-        locomo_writel(bpwf | LCM_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
-        spin_unlock_irqrestore(&lchip->lock, flags);
-}
-
-
 /**
  *      locomo_probe - probe for a single LoCoMo chip.
  *      @phys_addr: physical address of device.
@@ -698,14 +683,10 @@ __locomo_probe(struct device *me, struct resource *mem, int irq)
                         , lchip->base + LOCOMO_GPD);
         locomo_writel(0, lchip->base + LOCOMO_GIE);
 
-        /* FrontLight */
+        /* Frontlight */
         locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
         locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
 
-        /* Same constants can be used for collie and poodle
-           (depending on CONFIG options in original sharp code)? */
-        frontlight_set(lchip, 163, 0, 148);
-
         /* Longtime timer */
         locomo_writel(0, lchip->base + LOCOMO_LTINT);
         /* SPI */
@@ -1063,6 +1044,30 @@ void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int
 }
 
 /*
+ *      Frontlight control
+ */
+
+static struct locomo *locomo_chip_driver(struct locomo_dev *ldev);
+
+void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
+{
+        unsigned long flags;
+        struct locomo *lchip = locomo_chip_driver(dev);
+
+        if (vr)
+                locomo_gpio_write(dev, LOCOMO_GPIO_FL_VR, 1);
+        else
+                locomo_gpio_write(dev, LOCOMO_GPIO_FL_VR, 0);
+
+        spin_lock_irqsave(&lchip->lock, flags);
+        locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
+        udelay(100);
+        locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
+        locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
+        spin_unlock_irqrestore(&lchip->lock, flags);
+}
+
+/*
  *      LoCoMo "Register Access Bus."
  *
  *      We model this as a regular bus type, and hang devices directly