add dbrightness attribute for leds, overriding brightness.

diff --git a/kernel-power-2.6.28/debian/patches/led_dbrightness.diff b/kernel-power-2.6.28/debian/patches/led_dbrightness.diff
new file mode 100644 (file)
index 0000000..c40dbd4
--- /dev/null
+++ b/kernel-power-2.6.28/debian/patches/led_dbrightness.diff
@@ -0,0 +1,97 @@
+--- orig/kernel-source/drivers/leds/led-class.c        2008-12-25 01:26:37.000000000 +0200
++++ kernel-source/drivers/leds/led-class.c     2010-04-16 15:43:04.000000000 +0300
+@@ -22,6 +22,8 @@
+ #include <linux/leds.h>
+ #include "leds.h"
+ 
++#define LED_FLAG_DBRIGHTNESS 0x100
++
+ static struct class *leds_class;
+ 
+ static void led_update_brightness(struct led_classdev *led_cdev)
+@@ -50,6 +52,9 @@
+       unsigned long state = simple_strtoul(buf, &after, 10);
+       size_t count = after - buf;
+ 
++      if (led_cdev->flags & LED_FLAG_DBRIGHTNESS) 
++              return size;
++
+       if (*after && isspace(*after))
+               count++;
+ 
+@@ -69,6 +74,51 @@
+ static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store);
+ #endif
+ 
++static ssize_t led_dbrightness_show(struct device *dev, 
++              struct device_attribute *attr, char *buf)
++{
++      struct led_classdev *led_cdev = dev_get_drvdata(dev);
++
++      if (!(led_cdev->flags & LED_FLAG_DBRIGHTNESS)) 
++              return sprintf(buf, "-1\n");
++              
++      /* no lock needed for this */
++      led_update_brightness(led_cdev);
++
++      return sprintf(buf, "%u\n", led_cdev->brightness);
++}
++
++static ssize_t led_dbrightness_store(struct device *dev,
++              struct device_attribute *attr, const char *buf, size_t size)
++{
++      struct led_classdev *led_cdev = dev_get_drvdata(dev);
++      ssize_t ret = -EINVAL;
++      char *after;
++      unsigned long state = simple_strtol(buf, &after, 10);
++      size_t count = after - buf;
++
++      if (state == -1) {
++              led_cdev->flags &= ~LED_FLAG_DBRIGHTNESS;
++              return size;
++      }
++
++      if (*after && isspace(*after))
++              count++;
++
++      if (count == size) {
++              ret = count;
++
++              led_cdev->flags |= LED_FLAG_DBRIGHTNESS;
++              if (state == LED_OFF)
++                      led_trigger_remove(led_cdev);
++              led_set_brightness(led_cdev, state);
++      }
++
++      return ret;
++}
++
++static DEVICE_ATTR(dbrightness, 0644, led_dbrightness_show, led_dbrightness_store);
++
+ /**
+  * led_classdev_suspend - suspend an led_classdev.
+  * @led_cdev: the led_classdev to suspend.
+@@ -110,6 +160,10 @@
+       if (rc)
+               goto err_out;
+ 
++      rc = device_create_file(led_cdev->dev, &dev_attr_dbrightness);
++      if (rc)
++              goto err_out_dbrightness;
++
+ #ifdef CONFIG_LEDS_TRIGGERS
+       init_rwsem(&led_cdev->trigger_lock);
+ #endif
+@@ -135,9 +189,11 @@
+ 
+ #ifdef CONFIG_LEDS_TRIGGERS
+ err_out_led_list:
+-      device_remove_file(led_cdev->dev, &dev_attr_brightness);
++      device_remove_file(led_cdev->dev, &dev_attr_dbrightness);
+       list_del(&led_cdev->node);
+ #endif
++err_out_dbrightness:
++      device_remove_file(led_cdev->dev, &dev_attr_brightness);
+ err_out:
+       device_unregister(led_cdev->dev);
+       return rc;