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author | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-04-17 12:46:29 +0300 |
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committer | Guenter Roeck <linux@roeck-us.net> | 2019-04-17 20:37:23 +0300 |
commit | 7ebd8b66dd9e5a0b65e5ee5e2b8e7ca382ec97b7 (patch) | |
tree | 9db30159bd32bec125c7d49e80a79bb7c4da0c8e /Documentation/hwmon/da9052 | |
parent | b04f2f7d387b3160883c2a1f5e2285483a791e82 (diff) | |
download | linux-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>
Diffstat (limited to 'Documentation/hwmon/da9052')
-rw-r--r-- | Documentation/hwmon/da9052 | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/Documentation/hwmon/da9052 b/Documentation/hwmon/da9052 deleted file mode 100644 index c1c0f1f08904..000000000000 --- a/Documentation/hwmon/da9052 +++ /dev/null @@ -1,78 +0,0 @@ -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. |