Documentation/hwmon/mc13783-adc

   1 Kernel driver mc13783-adc
   2 =========================
   3
   4 Supported chips:
   5   * Freescale Atlas MC13783
   6     Prefix: 'mc13783_adc'
   7     Datasheet: http://www.freescale.com/files/rf_if/doc/data_sheet/MC13783.pdf?fsrch=1
   8
   9 Authors:
  10     Sascha Hauer <s.hauer@pengutronix.de>
  11     Luotao Fu <l.fu@pengutronix.de>
  12
  13 Description
  14 -----------
  15
  16 The Freescale MC13783 is a Power Management and Audio Circuit. Among
  17 other things it contains a 10-bit A/D converter. The converter has 16
  18 channels which can be used in different modes.
  19 The A/D converter has a resolution of 2.25mV. Channels 0-4 have
  20 a dedicated meaning with chip internal scaling applied. Channels 5-7
  21 can be used as general purpose inputs or alternatively in a dedicated
  22 mode. Channels 12-15 are occupied by the touchscreen if it's active.
  23
  24 Currently the driver only supports channels 2 and 5-15 with no alternative
  25 modes for channels 5-7.
  26
  27 See this table for the meaning of the different channels and their chip
  28 internal scaling:
  29
  30 Channel Signal                                          Input Range     Scaling
  31 -------------------------------------------------------------------------------
  32 0       Battery Voltage (BATT)                          2.50 - 4.65V    -2.40V
  33 1       Battery Current (BATT - BATTISNS)               -50 - 50 mV     x20
  34 2       Application Supply (BP)                         2.50 - 4.65V    -2.40V
  35 3       Charger Voltage (CHRGRAW)                       0 - 10V /       /5
  36                                                         0 - 20V         /10
  37 4       Charger Current (CHRGISNSP-CHRGISNSN)           -0.25V - 0.25V  x4
  38 5       General Purpose ADIN5 / Battery Pack Thermistor 0 - 2.30V       No
  39 6       General Purpose ADIN6 / Backup Voltage (LICELL) 0 - 2.30V /     No /
  40                                                         1.50 - 3.50V    -1.20V
  41 7       General Purpose ADIN7 / UID / Die Temperature   0 - 2.30V /     No /
  42                                                         0 - 2.55V /     x0.9 / No
  43 8       General Purpose ADIN8                           0 - 2.30V       No
  44 9       General Purpose ADIN9                           0 - 2.30V       No
  45 10      General Purpose ADIN10                          0 - 2.30V       No
  46 11      General Purpose ADIN11                          0 - 2.30V       No
  47 12      General Purpose TSX1 / Touchscreen X-plate 1    0 - 2.30V       No
  48 13      General Purpose TSX2 / Touchscreen X-plate 2    0 - 2.30V       No
  49 14      General Purpose TSY1 / Touchscreen Y-plate 1    0 - 2.30V       No
  50 15      General Purpose TSY2 / Touchscreen Y-plate 2    0 - 2.30V       No