93ee0a75f6
This driver provides support for the ADC integrated into the Freescale MC13783 PMIC. Signed-off-by: Luotao Fu <l.fu@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Hans de Goede <hdegoede@redhat.com> Cc: Eric Piel <eric.piel@tremplin-utc.net> Signed-off-by: Jean Delvare <khali@linux-fr.org>
2.0 KiB
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 s.hauer@pengutronix.de Luotao Fu l.fu@pengutronix.de
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