diff options
| author | Shreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com> | 2011-11-03 16:01:37 +0530 |
|---|---|---|
| committer | Philippe Langlais <philippe.langlais@stericsson.com> | 2012-05-22 11:01:11 +0200 |
| commit | 1fa4ffa3bd74c841979a4f05cf6dd9a64e9769e7 (patch) | |
| tree | 584c5aadc6819304d4a74ff0fdfbf2002ec14f96 /Documentation | |
| parent | 056e6e09ac185ed00a3fa08764af0efb18c97f1d (diff) | |
ab5500: enable GPADC-0 and provide sysfs interfce
This patch enables GPADC-0 to convert from voltage range
0 to 1.8v and also adds sysfs interface for reading gpadc ch-0.
"/sys/devices/platform/ab5500-core.0/ab5500-adc.0/adc0volt"
ST-Ericsson ID: 370066
ST-Ericsson Linux next: NA
ST-Ericsson FOSS-OUT ID: Trivial
Change-Id: Ic23caa22ff4e10d3dbb151e10eb4625ec5d7078a
Signed-off-by: Shreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/36216
Reviewed-by: QATOOLS
Reviewed-by: QABUILD
Reviewed-by: Linus WALLEIJ <linus.walleij@stericsson.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-platform-ab5500-core-adc | 20 |
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. + |