summaryrefslogtreecommitdiff
path: root/Documentation/ABI/testing/sysfs-devices-platform-ab5500-core-adc
diff options
context:
space:
mode:
authorPhilippe Langlais <philippe.langlais@stericsson.com>2012-06-04 19:45:23 +0800
committerPhilippe Langlais <philippe.langlais@stericsson.com>2012-06-04 19:45:23 +0800
commita05c58e73b23211d7b8d4ea31a0519ea41d4ec3c (patch)
treeb3aa7890aba1877b417e900994126bb0a6e2f359 /Documentation/ABI/testing/sysfs-devices-platform-ab5500-core-adc
parent9ce0109275e82697ada4b005325e663ba72c3181 (diff)
parentf0bfbaaec3d8dfb06790c59bc5d6c848f0bbd5f8 (diff)
Merge topic branch 'core' into integration-linux-ux500
Diffstat (limited to 'Documentation/ABI/testing/sysfs-devices-platform-ab5500-core-adc')
-rw-r--r--Documentation/ABI/testing/sysfs-devices-platform-ab5500-core-adc20
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-platform-ab5500-core-adc b/Documentation/ABI/testing/sysfs-devices-platform-ab5500-core-adc
new file mode 100644
index 00000000000..fcfc0ed26fb
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-platform-ab5500-core-adc
@@ -0,0 +1,20 @@
+What: /sys/devices/platform/ab5500-core.0/ab5500-adc.0/adc0volt
+Date: Nov 2011
+KernelVersion: 3.0
+Contact: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
+Description: The adc0volt attribute allows the userspace to read the
+ voltage of the device connected to the General Purpose
+ Analog to Digital Converter (GPADC) channel-0. Voltage
+ conversion from analog to digital happens only when this
+ attribute is read. GPADC block is present in AB5500 chip
+ and has input voltage range of 0-1.8 volt for GPADC Ch-0.
+ It provides result of the converted voltage in 10 bits.
+ Other GPADC channels attributes may appear in this path
+ later. For minimum and maximum input voltage range for
+ each channel please refer to the ST-Ericssons AB5500
+ datasheet. An example usage of GPADC can be an ALS device
+ connected to the channel and user space adapts the
+ LCD backlight brightness based on ambient light value
+ read from the attribute.
+Users: HAL.
+