#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/fb.h>
-#include <asm/bug.h>
static ssize_t backlight_show_power(struct class_device *cdev, char *buf)
{
- int rc;
+ int rc = -ENXIO;
struct backlight_device *bd = to_backlight_device(cdev);
down(&bd->sem);
- if (likely(bd->props && bd->props->get_power))
- rc = sprintf(buf, "%d\n", bd->props->get_power(bd));
- else
- rc = -ENXIO;
+ if (likely(bd->props))
+ rc = sprintf(buf, "%d\n", bd->props->power);
up(&bd->sem);
return rc;
static ssize_t backlight_store_power(struct class_device *cdev, const char *buf, size_t count)
{
- int rc, power;
+ int rc = -ENXIO;
char *endp;
struct backlight_device *bd = to_backlight_device(cdev);
+ int power = simple_strtoul(buf, &endp, 0);
+ size_t size = endp - buf;
- power = simple_strtoul(buf, &endp, 0);
- if (*endp && !isspace(*endp))
+ if (*endp && isspace(*endp))
+ size++;
+ if (size != count)
return -EINVAL;
down(&bd->sem);
- if (likely(bd->props && bd->props->set_power)) {
+ if (likely(bd->props)) {
pr_debug("backlight: set power to %d\n", power);
- bd->props->set_power(bd, power);
+ bd->props->power = power;
+ if (likely(bd->props->update_status))
+ bd->props->update_status(bd);
rc = count;
- } else
- rc = -ENXIO;
+ }
up(&bd->sem);
return rc;
static ssize_t backlight_show_brightness(struct class_device *cdev, char *buf)
{
- int rc;
+ int rc = -ENXIO;
struct backlight_device *bd = to_backlight_device(cdev);
down(&bd->sem);
- if (likely(bd->props && bd->props->get_brightness))
- rc = sprintf(buf, "%d\n", bd->props->get_brightness(bd));
- else
- rc = -ENXIO;
+ if (likely(bd->props))
+ rc = sprintf(buf, "%d\n", bd->props->brightness);
up(&bd->sem);
return rc;
static ssize_t backlight_store_brightness(struct class_device *cdev, const char *buf, size_t count)
{
- int rc, brightness;
+ int rc = -ENXIO;
char *endp;
struct backlight_device *bd = to_backlight_device(cdev);
+ int brightness = simple_strtoul(buf, &endp, 0);
+ size_t size = endp - buf;
- brightness = simple_strtoul(buf, &endp, 0);
- if (*endp && !isspace(*endp))
+ if (*endp && isspace(*endp))
+ size++;
+ if (size != count)
return -EINVAL;
down(&bd->sem);
- if (likely(bd->props && bd->props->set_brightness)) {
- pr_debug("backlight: set brightness to %d\n", brightness);
- bd->props->set_brightness(bd, brightness);
- rc = count;
- } else
- rc = -ENXIO;
+ if (likely(bd->props)) {
+ if (brightness > bd->props->max_brightness)
+ rc = -EINVAL;
+ else {
+ pr_debug("backlight: set brightness to %d\n",
+ brightness);
+ bd->props->brightness = brightness;
+ if (likely(bd->props->update_status))
+ bd->props->update_status(bd);
+ rc = count;
+ }
+ }
up(&bd->sem);
return rc;
static ssize_t backlight_show_max_brightness(struct class_device *cdev, char *buf)
{
- int rc;
+ int rc = -ENXIO;
struct backlight_device *bd = to_backlight_device(cdev);
down(&bd->sem);
if (likely(bd->props))
rc = sprintf(buf, "%d\n", bd->props->max_brightness);
- else
- rc = -ENXIO;
+ up(&bd->sem);
+
+ return rc;
+}
+
+static ssize_t backlight_show_actual_brightness(struct class_device *cdev,
+ char *buf)
+{
+ int rc = -ENXIO;
+ struct backlight_device *bd = to_backlight_device(cdev);
+
+ down(&bd->sem);
+ if (likely(bd->props && bd->props->get_brightness))
+ rc = sprintf(buf, "%d\n", bd->props->get_brightness(bd));
up(&bd->sem);
return rc;
static struct class_device_attribute bl_class_device_attributes[] = {
DECLARE_ATTR(power, 0644, backlight_show_power, backlight_store_power),
- DECLARE_ATTR(brightness, 0644, backlight_show_brightness, backlight_store_brightness),
+ DECLARE_ATTR(brightness, 0644, backlight_show_brightness,
+ backlight_store_brightness),
+ DECLARE_ATTR(actual_brightness, 0444, backlight_show_actual_brightness,
+ NULL),
DECLARE_ATTR(max_brightness, 0444, backlight_show_max_brightness, NULL),
};
bd = container_of(self, struct backlight_device, fb_notif);
down(&bd->sem);
if (bd->props)
- if (!bd->props->check_fb || bd->props->check_fb(evdata->info))
- bd->props->set_power(bd, *(int *)evdata->data);
+ if (!bd->props->check_fb ||
+ bd->props->check_fb(evdata->info)) {
+ bd->props->fb_blank = *(int *)evdata->data;
+ if (likely(bd->props && bd->props->update_status))
+ bd->props->update_status(bd);
+ }
up(&bd->sem);
return 0;
}
new_bd = kmalloc(sizeof(struct backlight_device), GFP_KERNEL);
if (unlikely(!new_bd))
- return ERR_PTR(ENOMEM);
+ return ERR_PTR(-ENOMEM);
init_MUTEX(&new_bd->sem);
new_bd->props = bp;
&bl_class_device_attributes[i]);
down(&bd->sem);
+ if (likely(bd->props && bd->props->update_status)) {
+ bd->props->brightness = 0;
+ bd->props->power = 0;
+ bd->props->update_status(bd);
+ }
+
bd->props = NULL;
up(&bd->sem);