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authorMauro Carvalho Chehab <mchehab+samsung@kernel.org>2019-04-17 12:46:29 +0300
committerGuenter Roeck <linux@roeck-us.net>2019-04-17 20:37:23 +0300
commit7ebd8b66dd9e5a0b65e5ee5e2b8e7ca382ec97b7 (patch)
tree9db30159bd32bec125c7d49e80a79bb7c4da0c8e /Documentation/hwmon/da9052
parentb04f2f7d387b3160883c2a1f5e2285483a791e82 (diff)
downloadlinux-7ebd8b66dd9e5a0b65e5ee5e2b8e7ca382ec97b7.tar.xz
docs: hwmon: Add an index file and rename docs to *.rst
Now that all files were converted to ReST format, rename them and add an index. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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-Kernel driver da9052
-====================
-
-Supported chips:
-
- * Dialog Semiconductors DA9052-BC and DA9053-AA/Bx PMICs
-
- Prefix: 'da9052'
-
- Datasheet: Datasheet is not publicly available.
-
-Authors: David Dajun Chen <dchen@diasemi.com>
-
-Description
------------
-
-The DA9052/53 provides an Analogue to Digital Converter (ADC) with 10 bits
-resolution and track and hold circuitry combined with an analogue input
-multiplexer. The analogue input multiplexer will allow conversion of up to 10
-different inputs. The track and hold circuit ensures stable input voltages at
-the input of the ADC during the conversion.
-
-The ADC is used to measure the following inputs:
-
-========= ===================================================================
-Channel 0 VDDOUT - measurement of the system voltage
-Channel 1 ICH - internal battery charger current measurement
-Channel 2 TBAT - output from the battery NTC
-Channel 3 VBAT - measurement of the battery voltage
-Channel 4 ADC_IN4 - high impedance input (0 - 2.5V)
-Channel 5 ADC_IN5 - high impedance input (0 - 2.5V)
-Channel 6 ADC_IN6 - high impedance input (0 - 2.5V)
-Channel 7 XY - TSI interface to measure the X and Y voltage of the touch
- screen resistive potentiometers
-Channel 8 Internal Tjunc. - sense (internal temp. sensor)
-Channel 9 VBBAT - measurement of the backup battery voltage
-========= ===================================================================
-
-By using sysfs attributes we can measure the system voltage VDDOUT, the battery
-charging current ICH, battery temperature TBAT, battery junction temperature
-TJUNC, battery voltage VBAT and the back up battery voltage VBBAT.
-
-Voltage Monitoring
-------------------
-
-Voltages are sampled by a 10 bit ADC.
-
-The battery voltage is calculated as:
-
- Milli volt = ((ADC value * 1000) / 512) + 2500
-
-The backup battery voltage is calculated as:
-
- Milli volt = (ADC value * 2500) / 512;
-
-The voltages on ADC channels 4, 5 and 6 are calculated as:
-
- Milli volt = (ADC value * 2500) / 1023
-
-Temperature Monitoring
-----------------------
-
-Temperatures are sampled by a 10 bit ADC. Junction and battery temperatures
-are monitored by the ADC channels.
-
-The junction temperature is calculated:
-
- Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
-
-The junction temperature attribute is supported by the driver.
-
-The battery temperature is calculated:
-
- Degree Celsius = 1 / (t1 + 1/298) - 273
-
-where t1 = (1/B)* ln(( ADCval * 2.5)/(R25*ITBAT*255))
-
-Default values of R25, B, ITBAT are 10e3, 3380 and 50e-6 respectively.