[PATCH] backlight: corgi_bl: Generalise to support other Sharp SL hardware

Generalise the Corgi backlight driver by moving the default intensity and
limit mask settings into the platform specific data structure.  This enables
the driver to support other Zaurus hardware, specifically the SL-6000x (Tosa)
model.

Also change the spinlock to a mutex (the spinlock is overkill).

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

2 files changed, 15 insertions, 20 deletions

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 9d996f2c10d..b895eaaa73f 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -43,11 +43,11 @@ config LCD_DEVICE
 	default y
 
 config BACKLIGHT_CORGI
-	tristate "Sharp Corgi Backlight Driver (SL-C7xx Series)"
+	tristate "Sharp Corgi Backlight Driver (SL Series)"
 	depends on BACKLIGHT_DEVICE && PXA_SHARPSL
 	default y
 	help
-	  If you have a Sharp Zaurus SL-C7xx, say y to enable the
+	  If you have a Sharp Zaurus SL-C7xx, SL-Cxx00 or SL-6000x say y to enable the
 	  backlight driver.
 
 config BACKLIGHT_HP680
diff --git a/drivers/video/backlight/corgi_bl.c b/drivers/video/backlight/corgi_bl.c
index f86213b4a8f..2ebbfd95145 100644
--- a/drivers/video/backlight/corgi_bl.c
+++ b/drivers/video/backlight/corgi_bl.c
@@ -1,7 +1,7 @@
 /*
- *  Backlight Driver for Sharp Corgi
+ *  Backlight Driver for Sharp Zaurus Handhelds (various models)
  *
- *  Copyright (c) 2004-2005 Richard Purdie
+ *  Copyright (c) 2004-2006 Richard Purdie
  *
  *  Based on Sharp's 2.4 Backlight Driver
  *
@@ -15,21 +15,17 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
-#include <linux/spinlock.h>
+#include <linux/mutex.h>
 #include <linux/fb.h>
 #include <linux/backlight.h>
-
 #include <asm/arch/sharpsl.h>
 #include <asm/hardware/sharpsl_pm.h>
 
-#define CORGI_DEFAULT_INTENSITY		0x1f
-#define CORGI_LIMIT_MASK		0x0b
-
 static int corgibl_intensity;
-static void (*corgibl_mach_set_intensity)(int intensity);
-static spinlock_t bl_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_MUTEX(bl_mutex);
 static struct backlight_properties corgibl_data;
 static struct backlight_device *corgi_backlight_device;
+static struct corgibl_machinfo *bl_machinfo;
 
 static unsigned long corgibl_flags;
 #define CORGIBL_SUSPENDED     0x01
@@ -37,7 +33,6 @@ static unsigned long corgibl_flags;
 
 static int corgibl_send_intensity(struct backlight_device *bd)
 {
-	unsigned long flags;
 	void (*corgi_kick_batt)(void);
 	int intensity = bd->props->brightness;
 
@@ -48,13 +43,11 @@ static int corgibl_send_intensity(struct backlight_device *bd)
 	if (corgibl_flags & CORGIBL_SUSPENDED)
 		intensity = 0;
 	if (corgibl_flags & CORGIBL_BATTLOW)
-		intensity &= CORGI_LIMIT_MASK;
-
-	spin_lock_irqsave(&bl_lock, flags);
-
-	corgibl_mach_set_intensity(intensity);
+		intensity &= bl_machinfo->limit_mask;
 
-	spin_unlock_irqrestore(&bl_lock, flags);
+ 	mutex_lock(&bl_mutex);
+	bl_machinfo->set_bl_intensity(intensity);
+	mutex_unlock(&bl_mutex);
 
 	corgibl_intensity = intensity;
 
@@ -122,8 +115,10 @@ static int __init corgibl_probe(struct platform_device *pdev)
 {
 	struct corgibl_machinfo *machinfo = pdev->dev.platform_data;
 
+	bl_machinfo = machinfo;
 	corgibl_data.max_brightness = machinfo->max_intensity;
-	corgibl_mach_set_intensity = machinfo->set_bl_intensity;
+	if (!machinfo->limit_mask)
+		machinfo->limit_mask = -1;
 
 	corgi_backlight_device = backlight_device_register ("corgi-bl",
 		NULL, &corgibl_data);
@@ -131,7 +126,7 @@ static int __init corgibl_probe(struct platform_device *pdev)
 		return PTR_ERR (corgi_backlight_device);
 
 	corgibl_data.power = FB_BLANK_UNBLANK;
-	corgibl_data.brightness = CORGI_DEFAULT_INTENSITY;
+	corgibl_data.brightness = machinfo->default_intensity;
 	corgibl_send_intensity(corgi_backlight_device);
 
 	printk("Corgi Backlight Driver Initialized.\n");