#include <linux/stddef.h>
#include <linux/reboot.h>
#include <linux/nvram.h>
+#include <linux/console.h>
#include <asm/sections.h>
#include <asm/ptrace.h>
#include <asm/io.h>
#include <linux/adb.h>
#include <linux/pmu.h>
-static struct backlight_controller *backlighter = NULL;
-static void* backlighter_data = NULL;
-static int backlight_autosave = 0;
+static struct backlight_controller *backlighter;
+static void* backlighter_data;
+static int backlight_autosave;
static int backlight_level = BACKLIGHT_MAX;
static int backlight_enabled = 1;
+static int backlight_req_level = -1;
+static int backlight_req_enable = -1;
-void __pmac
-register_backlight_controller(struct backlight_controller *ctrler, void *data, char *type)
+static void backlight_callback(void *);
+static DECLARE_WORK(backlight_work, backlight_callback, NULL);
+
+void __pmac register_backlight_controller(struct backlight_controller *ctrler,
+ void *data, char *type)
{
struct device_node* bk_node;
char *prop;
backlight_level = req.reply[0] >> 4;
}
#endif
+ acquire_console_sem();
if (!backlighter->set_enable(1, backlight_level, data))
backlight_enabled = 1;
+ release_console_sem();
- printk(KERN_INFO "Registered \"%s\" backlight controller, level: %d/15\n",
- type, backlight_level);
+ printk(KERN_INFO "Registered \"%s\" backlight controller,"
+ "level: %d/15\n", type, backlight_level);
}
EXPORT_SYMBOL(register_backlight_controller);
-void __pmac
-unregister_backlight_controller(struct backlight_controller *ctrler, void *data)
+void __pmac unregister_backlight_controller(struct backlight_controller
+ *ctrler, void *data)
{
/* We keep the current backlight level (for now) */
if (ctrler == backlighter && data == backlighter_data)
}
EXPORT_SYMBOL(unregister_backlight_controller);
-int __pmac
-set_backlight_enable(int enable)
+static int __pmac __set_backlight_enable(int enable)
{
int rc;
if (!backlighter)
return -ENODEV;
- rc = backlighter->set_enable(enable, backlight_level, backlighter_data);
+ acquire_console_sem();
+ rc = backlighter->set_enable(enable, backlight_level,
+ backlighter_data);
if (!rc)
backlight_enabled = enable;
+ release_console_sem();
return rc;
}
+int __pmac set_backlight_enable(int enable)
+{
+ if (!backlighter)
+ return -ENODEV;
+ backlight_req_enable = enable;
+ schedule_work(&backlight_work);
+ return 0;
+}
+
EXPORT_SYMBOL(set_backlight_enable);
-int __pmac
-get_backlight_enable(void)
+int __pmac get_backlight_enable(void)
{
if (!backlighter)
return -ENODEV;
}
EXPORT_SYMBOL(get_backlight_enable);
-int __pmac
-set_backlight_level(int level)
+static int __pmac __set_backlight_level(int level)
{
int rc = 0;
level = BACKLIGHT_OFF;
if (level > BACKLIGHT_MAX)
level = BACKLIGHT_MAX;
+ acquire_console_sem();
if (backlight_enabled)
rc = backlighter->set_level(level, backlighter_data);
if (!rc)
backlight_level = level;
+ release_console_sem();
if (!rc && !backlight_autosave) {
level <<=1;
if (level & 0x10)
}
return rc;
}
+int __pmac set_backlight_level(int level)
+{
+ if (!backlighter)
+ return -ENODEV;
+ backlight_req_level = level;
+ schedule_work(&backlight_work);
+ return 0;
+}
+
EXPORT_SYMBOL(set_backlight_level);
-int __pmac
-get_backlight_level(void)
+int __pmac get_backlight_level(void)
{
if (!backlighter)
return -ENODEV;
return backlight_level;
}
EXPORT_SYMBOL(get_backlight_level);
+
+static void backlight_callback(void *dummy)
+{
+ int level, enable;
+
+ do {
+ level = backlight_req_level;
+ enable = backlight_req_enable;
+ mb();
+
+ if (level >= 0)
+ __set_backlight_level(level);
+ if (enable >= 0)
+ __set_backlight_enable(enable);
+ } while(cmpxchg(&backlight_req_level, level, -1) != level ||
+ cmpxchg(&backlight_req_enable, enable, -1) != enable);
+}