BackLight - Revision history

JulienB: /* Usage */

2017-07-18T22:17:36Z

‎Usage

2016-12-23T15:45:32Z

‎Usage

2016-04-15T16:29:37Z

‎Usage

2016-04-15T16:28:40Z

‎Usage

2010-08-15T15:48:54Z

‎Introduction

2009-09-15T11:45:54Z

‎Usage

2009-03-08T13:58:49Z

install by default

2009-02-06T09:10:43Z

apf27 compatible now

2009-02-06T09:09:43Z

‎Installation

2009-02-05T17:07:25Z

@@ Line 33: / Line 33: @@
 ||<pre class="apf">
-export BACK_IF=lcd
+export BACK_IF=lcd_backlight
 </pre>

@@ Line 12: / Line 12: @@
 ==Usage==
-On your APF, load the module (not needed on [[APF6]]):
+On your APF, load the module (not needed on [[APF6]] and [[OPOS6UL]]):
 <pre class="apf">
   # modprobe imx_bl
@@ Line 21: / Line 21: @@
 {| border="1" cellpadding="10" cellspacing="0" summary="PWM usage depending on kernel version" class="wikitable"
 |- style="background:#efefef;" align="center"
-! APF27/51/28 || APF6
+! APF27/51/28 || APF6 || OPOS6UL
 |-----
@@ Line 30: / Line 30: @@
 ||<pre class="apf">
 export BACK_IF=backlight_lcd
 </pre>
@@ Line 49: / Line 53: @@
   # cat /sys/class/backlight/$BACK_IF/max_brightness
 </pre>
-* To change the brightness:
+* To change the brightness (X depends on previous allowed brightnesses):
 <pre class="apf">
-  # echo 100 > /sys/class/backlight/$BACK_IF/brightness
+  # echo X > /sys/class/backlight/$BACK_IF/brightness
 </pre>

@@ Line 43: / Line 43: @@
 * To see the actual brightness:
 <pre class="apf">
-  # cat /sys/class/backlight/imx-bl/actual_brightness
+  # cat /sys/class/backlight/$BACK_IF/actual_brightness
 </pre>
 * To see the max allowed brightness:

@@ Line 12: / Line 12: @@
 ==Usage==
-On your APF, load the module:
+On your APF, load the module (not needed on [[APF6]]):
 <pre class="apf">
   # modprobe imx_bl
   i.MX Backlight driver v0.X initialized.
 </pre>
 All backlight controls are done through the ''/sys'' interface:
 <pre class="apf">
-  # ls /sys/class/backlight/imx-bl/
+  # ls /sys/class/backlight/$BACK_IF/
   actual_brightness  max_brightness     subsystem
   brightness         power              uevent
@@ Line 31: / Line 47: @@
 * To see the max allowed brightness:
 <pre class="apf">
-  # cat /sys/class/backlight/imx-bl/max_brightness
+  # cat /sys/class/backlight/$BACK_IF/max_brightness
 </pre>
 * To change the brightness:
 <pre class="apf">
-  # echo 100 > /sys/class/backlight/imx-bl/brightness
+  # echo 100 > /sys/class/backlight/$BACK_IF/brightness
 </pre>

@@ Line 3: / Line 3: @@
 ==Introduction==
-Backlight control is done through the i.MXL/i.MX27 integrated backlight PWM (inside LCDC module). The output signal of this PWM is redirected to the CONTRAST pin of your LCD connector.
+Backlight control is done through the i.MX integrated backlight PWM (inside LCDC module). The output signal of this PWM is redirected to the CONTRAST pin of your LCD connector.
 In short the driver is mainly exporting a ''/sys'' interface to user space, allowing you to change the Duty Cycle of the PWM output signal and so the backlight intensity of the LCD.

@@ Line 38: / Line 38: @@
 </pre>
-There is a small test script in ''target/linux/modules/backlight/test/''
+===Examples===
 ==Links==

@@ Line 8: / Line 8: @@
 ==Installation==
-This driver is now installed by default on the standard Armadeus rootfs. So, following instructions are only given as reference.
+This driver is now installed by default on the standard Armadeus rootfs.
-<pre class="host">
- $ make linux26-menuconfig
-</pre>
-<pre class="config">
-    Device Drivers --->
-        Graphics support  --->
-            Backlight & LCD device support
-                <M>   Lowlevel Backlight controls
-            ...
-        Armadeus specific drivers --->
-            Support for specific Armadeus drivers
-                <M> i.MX backlight driver
-</pre>
-* If built in kernel, reflash your kernel image; if selected as module either reflash your rootfs or copy ''backlight.ko'', ''imx_bl.ko'' and ''.../lib/modules/2.6.18.1/modules.dep'' to your target (for more infos: [[Linux_drivers_generalities]]).
 ==Usage==