/*
- * Backlight Driver for Sharp Zaurus Handhelds (various models)
+ * Backlight Driver for Sharp Corgi
*
- * Copyright (c) 2004-2006 Richard Purdie
+ * Copyright (c) 2004-2005 Richard Purdie
*
* Based on Sharp's 2.4 Backlight Driver
*
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
-#include <linux/mutex.h>
+#include <linux/spinlock.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 DEFINE_MUTEX(bl_mutex);
-static struct backlight_properties corgibl_data;
-static struct backlight_device *corgi_backlight_device;
-static struct corgibl_machinfo *bl_machinfo;
+#define CORGI_DEFAULT_INTENSITY 0x1f
+#define CORGI_LIMIT_MASK 0x0b
-static unsigned long corgibl_flags;
-#define CORGIBL_SUSPENDED 0x01
-#define CORGIBL_BATTLOW 0x02
+static int corgibl_powermode = FB_BLANK_UNBLANK;
+static int current_intensity = 0;
+static int corgibl_limit = 0;
+static void (*corgibl_mach_set_intensity)(int intensity);
+static spinlock_t bl_lock = SPIN_LOCK_UNLOCKED;
+static struct backlight_properties corgibl_data;
-static int corgibl_send_intensity(struct backlight_device *bd)
+static void corgibl_send_intensity(int intensity)
{
+ unsigned long flags;
void (*corgi_kick_batt)(void);
- int intensity = bd->props->brightness;
- if (bd->props->power != FB_BLANK_UNBLANK)
- intensity = 0;
- if (bd->props->fb_blank != FB_BLANK_UNBLANK)
- intensity = 0;
- if (corgibl_flags & CORGIBL_SUSPENDED)
+ if (corgibl_powermode != FB_BLANK_UNBLANK) {
intensity = 0;
- if (corgibl_flags & CORGIBL_BATTLOW)
- intensity &= bl_machinfo->limit_mask;
+ } else {
+ if (corgibl_limit)
+ intensity &= CORGI_LIMIT_MASK;
+ }
- mutex_lock(&bl_mutex);
- bl_machinfo->set_bl_intensity(intensity);
- mutex_unlock(&bl_mutex);
+ spin_lock_irqsave(&bl_lock, flags);
- corgibl_intensity = intensity;
+ corgibl_mach_set_intensity(intensity);
+
+ spin_unlock_irqrestore(&bl_lock, flags);
corgi_kick_batt = symbol_get(sharpsl_battery_kick);
if (corgi_kick_batt) {
corgi_kick_batt();
symbol_put(sharpsl_battery_kick);
}
+}
- return 0;
+static void corgibl_blank(int blank)
+{
+ switch(blank) {
+
+ case FB_BLANK_NORMAL:
+ case FB_BLANK_VSYNC_SUSPEND:
+ case FB_BLANK_HSYNC_SUSPEND:
+ case FB_BLANK_POWERDOWN:
+ if (corgibl_powermode == FB_BLANK_UNBLANK) {
+ corgibl_send_intensity(0);
+ corgibl_powermode = blank;
+ }
+ break;
+ case FB_BLANK_UNBLANK:
+ if (corgibl_powermode != FB_BLANK_UNBLANK) {
+ corgibl_powermode = blank;
+ corgibl_send_intensity(current_intensity);
+ }
+ break;
+ }
}
#ifdef CONFIG_PM
static int corgibl_suspend(struct platform_device *dev, pm_message_t state)
{
- corgibl_flags |= CORGIBL_SUSPENDED;
- corgibl_send_intensity(corgi_backlight_device);
+ corgibl_blank(FB_BLANK_POWERDOWN);
return 0;
}
static int corgibl_resume(struct platform_device *dev)
{
- corgibl_flags &= ~CORGIBL_SUSPENDED;
- corgibl_send_intensity(corgi_backlight_device);
+ corgibl_blank(FB_BLANK_UNBLANK);
return 0;
}
#else
#define corgibl_resume NULL
#endif
-static int corgibl_get_intensity(struct backlight_device *bd)
+
+static int corgibl_set_power(struct backlight_device *bd, int state)
{
- return corgibl_intensity;
+ corgibl_blank(state);
+ return 0;
+}
+
+static int corgibl_get_power(struct backlight_device *bd)
+{
+ return corgibl_powermode;
}
-static int corgibl_set_intensity(struct backlight_device *bd)
+static int corgibl_set_intensity(struct backlight_device *bd, int intensity)
{
- corgibl_send_intensity(corgi_backlight_device);
+ if (intensity > corgibl_data.max_brightness)
+ intensity = corgibl_data.max_brightness;
+ corgibl_send_intensity(intensity);
+ current_intensity=intensity;
return 0;
}
+static int corgibl_get_intensity(struct backlight_device *bd)
+{
+ return current_intensity;
+}
+
/*
* Called when the battery is low to limit the backlight intensity.
* If limit==0 clear any limit, otherwise limit the intensity
*/
void corgibl_limit_intensity(int limit)
{
- if (limit)
- corgibl_flags |= CORGIBL_BATTLOW;
- else
- corgibl_flags &= ~CORGIBL_BATTLOW;
- corgibl_send_intensity(corgi_backlight_device);
+ corgibl_limit = (limit ? 1 : 0);
+ corgibl_send_intensity(current_intensity);
}
EXPORT_SYMBOL(corgibl_limit_intensity);
static struct backlight_properties corgibl_data = {
- .owner = THIS_MODULE,
+ .owner = THIS_MODULE,
+ .get_power = corgibl_get_power,
+ .set_power = corgibl_set_power,
.get_brightness = corgibl_get_intensity,
- .update_status = corgibl_set_intensity,
+ .set_brightness = corgibl_set_intensity,
};
+static struct backlight_device *corgi_backlight_device;
+
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;
- if (!machinfo->limit_mask)
- machinfo->limit_mask = -1;
+ corgibl_mach_set_intensity = machinfo->set_bl_intensity;
corgi_backlight_device = backlight_device_register ("corgi-bl",
NULL, &corgibl_data);
if (IS_ERR (corgi_backlight_device))
return PTR_ERR (corgi_backlight_device);
- corgibl_data.power = FB_BLANK_UNBLANK;
- corgibl_data.brightness = machinfo->default_intensity;
- corgibl_send_intensity(corgi_backlight_device);
+ corgibl_set_intensity(NULL, CORGI_DEFAULT_INTENSITY);
+ corgibl_limit_intensity(0);
printk("Corgi Backlight Driver Initialized.\n");
return 0;
{
backlight_device_unregister(corgi_backlight_device);
+ corgibl_set_intensity(NULL, 0);
+
printk("Corgi Backlight Driver Unloaded\n");
return 0;
}
git://git.onelab.eu / linux-2.6.git / blobdiff