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hwmon: Add Freescale MC13783 ADC driver

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This driver provides support for the ADC integrated into the
Freescale MC13783 PMIC.

Signed-off-by: Luotao Fu <[email protected]>
Signed-off-by: Sascha Hauer <[email protected]>
Signed-off-by: Uwe Kleine-König <[email protected]>
Reviewed-by: Mark Brown <[email protected]>
Acked-by: Hans de Goede <[email protected]>
Cc: Eric Piel <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
This commit is contained in:
Luotao Fu 2009-12-09 20:35:58 +01:00 • committed by Jean Delvare
commit 93ee0a75f6
4 changed files with 293 additions and 0 deletions
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Kernel driver mc13783-adc
=========================
Supported chips:
* Freescale Atlas MC13783
Prefix: 'mc13783_adc'
Datasheet: http://www.freescale.com/files/rf_if/doc/data_sheet/MC13783.pdf?fsrch=1
Authors:
Sascha Hauer <[email protected]>
Luotao Fu <[email protected]>
Description
-----------
The Freescale MC13783 is a Power Management and Audio Circuit. Among
other things it contains a 10-bit A/D converter. The converter has 16
channels which can be used in different modes.
The A/D converter has a resolution of 2.25mV. Channels 0-4 have
a dedicated meaning with chip internal scaling applied. Channels 5-7
can be used as general purpose inputs or alternatively in a dedicated
mode. Channels 12-15 are occupied by the touchscreen if it's active.
Currently the driver only supports channels 2 and 5-15 with no alternative
modes for channels 5-7.
See this table for the meaning of the different channels and their chip
internal scaling:
Channel Signal Input Range Scaling
-------------------------------------------------------------------------------
0 Battery Voltage (BATT) 2.50 - 4.65V -2.40V
1 Battery Current (BATT - BATTISNS) -50 - 50 mV x20
2 Application Supply (BP) 2.50 - 4.65V -2.40V
3 Charger Voltage (CHRGRAW) 0 - 10V / /5
0 - 20V /10
4 Charger Current (CHRGISNSP-CHRGISNSN) -0.25V - 0.25V x4
5 General Purpose ADIN5 / Battery Pack Thermistor 0 - 2.30V No
6 General Purpose ADIN6 / Backup Voltage (LICELL) 0 - 2.30V / No /
1.50 - 3.50V -1.20V
7 General Purpose ADIN7 / UID / Die Temperature 0 - 2.30V / No /
0 - 2.55V / x0.9 / No
8 General Purpose ADIN8 0 - 2.30V No
9 General Purpose ADIN9 0 - 2.30V No
10 General Purpose ADIN10 0 - 2.30V No
11 General Purpose ADIN11 0 - 2.30V No
12 General Purpose TSX1 / Touchscreen X-plate 1 0 - 2.30V No
13 General Purpose TSX2 / Touchscreen X-plate 2 0 - 2.30V No
14 General Purpose TSY1 / Touchscreen Y-plate 1 0 - 2.30V No
15 General Purpose TSY2 / Touchscreen Y-plate 2 0 - 2.30V No