backlight: Convert corgi backlight driver into a more generic driver

Convert the corgi backlight driver to a more generic version
so it can be reused by other code rather than being Zaurus/PXA
specific.
Signed-off-by: NRichard Purdie <rpurdie@rpsys.net>

arch/arm/mach-pxa/corgi.c

@@ -20,6 +20,7 @@
 #include <linux/interrupt.h>
 #include <linux/mmc/host.h>
 #include <linux/pm.h>
+#include <linux/backlight.h>
 
 #include <asm/setup.h>
 #include <asm/memory.h>
@@ -142,15 +143,28 @@ struct corgissp_machinfo corgi_ssp_machinfo = {
 /*
  * Corgi Backlight Device
  */
-static struct corgibl_machinfo corgi_bl_machinfo = {
+static void corgi_bl_kick_battery(void)
+{
+	void (*kick_batt)(void);
+
+	kick_batt = symbol_get(sharpsl_battery_kick);
+	if (kick_batt) {
+		kick_batt();
+		symbol_put(sharpsl_battery_kick);
+	}
+}
+
+static struct generic_bl_info corgi_bl_machinfo = {
+	.name = "corgi-bl",
 	.max_intensity = 0x2f,
 	.default_intensity = 0x1f,
 	.limit_mask = 0x0b,
 	.set_bl_intensity = corgi_bl_set_intensity,
+	.kick_battery = corgi_bl_kick_battery,
 };
 
 static struct platform_device corgibl_device = {
-	.name		= "corgi-bl",
+	.name		= "generic-bl",
 	.dev		= {
  		.parent = &corgifb_device.dev,
 		.platform_data	= &corgi_bl_machinfo,

arch/arm/mach-pxa/spitz.c

@@ -21,6 +21,7 @@
 #include <linux/interrupt.h>
 #include <linux/mmc/host.h>
 #include <linux/pm.h>
+#include <linux/backlight.h>
 
 #include <asm/setup.h>
 #include <asm/memory.h>
@@ -222,14 +223,27 @@ struct corgissp_machinfo spitz_ssp_machinfo = {
 /*
  * Spitz Backlight Device
  */
-static struct corgibl_machinfo spitz_bl_machinfo = {
+static void spitz_bl_kick_battery(void)
+{
+	void (*kick_batt)(void);
+
+	kick_batt = symbol_get(sharpsl_battery_kick);
+	if (kick_batt) {
+		kick_batt();
+		symbol_put(sharpsl_battery_kick);
+	}
+}
+
+static struct generic_bl_info spitz_bl_machinfo = {
+	.name = "corgi-bl",
 	.default_intensity = 0x1f,
 	.limit_mask = 0x0b,
 	.max_intensity = 0x2f,
+	.kick_battery = spitz_bl_kick_battery,
 };
 
 static struct platform_device spitzbl_device = {
-	.name		= "corgi-bl",
+	.name		= "generic-bl",
 	.dev		= {
  		.platform_data	= &spitz_bl_machinfo,
 	},

drivers/video/backlight/Kconfig

@@ -51,12 +51,13 @@ config BACKLIGHT_CLASS_DEVICE
 	  select the proper drivers which depend on this option.
 
 config BACKLIGHT_CORGI
-	tristate "Sharp Corgi Backlight Driver (SL Series)"
-	depends on BACKLIGHT_CLASS_DEVICE && PXA_SHARPSL
-	default y
+	tristate "Generic (aka Sharp Corgi) Backlight Driver"
+	depends on BACKLIGHT_CLASS_DEVICE
+	default n
 	help
-	  If you have a Sharp Zaurus SL-C7xx, SL-Cxx00 or SL-6000x say y to enable the
-	  backlight driver.
+	  Say y to enable the generic platform backlight driver previously
+	  known as the Corgi backlight driver. If you have a Sharp Zaurus
+	  SL-C7xx, SL-Cxx00 or SL-6000x say y. Most users can say n.
 
 config BACKLIGHT_LOCOMO
 	tristate "Sharp LOCOMO LCD/Backlight Driver"

drivers/video/backlight/corgi_bl.c

@@ -18,13 +18,11 @@
 #include <linux/mutex.h>
 #include <linux/fb.h>
 #include <linux/backlight.h>
-#include <asm/arch/sharpsl.h>
-#include <asm/hardware/sharpsl_pm.h>
 
 static int corgibl_intensity;
 static struct backlight_properties corgibl_data;
 static struct backlight_device *corgi_backlight_device;
-static struct corgibl_machinfo *bl_machinfo;
+static struct generic_bl_info *bl_machinfo;
 
 static unsigned long corgibl_flags;
 #define CORGIBL_SUSPENDED     0x01
@@ -32,7 +30,6 @@ static unsigned long corgibl_flags;
 
 static int corgibl_send_intensity(struct backlight_device *bd)
 {
-	void (*corgi_kick_batt)(void);
 	int intensity = bd->props.brightness;
 
 	if (bd->props.power != FB_BLANK_UNBLANK)
@@ -48,11 +45,8 @@ static int corgibl_send_intensity(struct backlight_device *bd)
 
 	corgibl_intensity = intensity;
 
- 	corgi_kick_batt = symbol_get(sharpsl_battery_kick);
- 	if (corgi_kick_batt) {
- 		corgi_kick_batt();
- 		symbol_put(sharpsl_battery_kick);
- 	}
+	if (bl_machinfo->kick_battery)
+		bl_machinfo->kick_battery();
 
 	return 0;
 }
@@ -107,13 +101,17 @@ static struct backlight_ops corgibl_ops = {
 
 static int corgibl_probe(struct platform_device *pdev)
 {
-	struct corgibl_machinfo *machinfo = pdev->dev.platform_data;
+	struct generic_bl_info *machinfo = pdev->dev.platform_data;
+	const char *name = "generic-bl";
 
 	bl_machinfo = machinfo;
 	if (!machinfo->limit_mask)
 		machinfo->limit_mask = -1;
 
-	corgi_backlight_device = backlight_device_register ("corgi-bl",
+	if (machinfo->name)
+		name = machinfo->name;
+
+	corgi_backlight_device = backlight_device_register (name,
 		&pdev->dev, NULL, &corgibl_ops);
 	if (IS_ERR (corgi_backlight_device))
 		return PTR_ERR (corgi_backlight_device);
@@ -149,7 +147,7 @@ static struct platform_driver corgibl_driver = {
 	.suspend	= corgibl_suspend,
 	.resume		= corgibl_resume,
 	.driver		= {
-		.name	= "corgi-bl",
+		.name	= "generic-bl",
 	},
 };
 

include/asm-arm/arch-pxa/sharpsl.h

@@ -25,12 +25,6 @@ struct corgits_machinfo {
 /*
  * SharpSL Backlight
  */
-struct corgibl_machinfo {
-	int max_intensity;
-	int default_intensity;
-	int limit_mask;
-	void (*set_bl_intensity)(int intensity);
-};
 extern void corgibl_limit_intensity(int limit);
 
 

include/linux/backlight.h

@@ -92,4 +92,13 @@ static inline void * bl_get_data(struct backlight_device *bl_dev)
 	return dev_get_drvdata(&bl_dev->dev);
 }
 
+struct generic_bl_info {
+	const char *name;
+	int max_intensity;
+	int default_intensity;
+	int limit_mask;
+	void (*set_bl_intensity)(int intensity);
+	void (*kick_battery)(void);
+};
+
 #endif