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hwmon: DA9055 HWMON driver

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This is the HWMON patch for DA9055 PMIC and has got dependency on the
DA9055 MFD core.

This patch monitors the DA9055 PMIC's ADC channels vddout, junction temperature
and auxiliary channels.

This patch is functionally tested on Samsung SMDKV6410.

Signed-off-by: David Dajun Chen <[email protected]>
Signed-off-by: Ashish Jangam <[email protected]>
[Guenter Roeck: Dropped __devinit, __devexit, __devexit_p]
Signed-off-by: Guenter Roeck <[email protected]>
This commit is contained in:
Ashish Jangam 2012-10-08 18:56:47 +05:30 • committed by Guenter Roeck
commit e597022353
4 changed files with 394 additions and 0 deletions
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Supported chips:
* Dialog Semiconductors DA9055 PMIC
Prefix: 'da9055'
Datasheet: Datasheet is not publicly available.
Authors: David Dajun Chen <[email protected]>
Description
-----------
The DA9055 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 5
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: ADC_IN1 - high impedance input (0 - 2.5V)
Channel 2: ADC_IN2 - high impedance input (0 - 2.5V)
Channel 3: ADC_IN3 - high impedance input (0 - 2.5V)
Channel 4: Internal Tjunc. - sense (internal temp. sensor)
By using sysfs attributes we can measure the system voltage VDDOUT,
chip junction temperature and auxiliary channels voltages.
Voltage Monitoring
------------------
Voltages are sampled in a AUTO mode it can be manually sampled too and results
are stored in a 10 bit ADC.
The system voltage is calculated as:
Milli volt = ((ADC value * 1000) / 85) + 2500
The voltages on ADC channels 1, 2 and 3 are calculated as:
Milli volt = (ADC value * 1000) / 102
Temperature Monitoring
----------------------
Temperatures are sampled by a 10 bit ADC. Junction temperatures
are monitored by the ADC channels.
The junction temperature is calculated:
Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332
The junction temperature attribute is supported by the driver.