Documentation/iio/ep93xx_adc.rst

   1 ==============================
   2 Cirrus Logic EP93xx ADC driver
   3 ==============================
   4
   5 1. Overview
   6 ===========
   7
   8 The driver is intended to work on both low-end (EP9301, EP9302) devices with
   9 5-channel ADC and high-end (EP9307, EP9312, EP9315) devices with 10-channel
  10 touchscreen/ADC module.
  11
  12 2. Channel numbering
  13 ====================
  14
  15 Numbering scheme for channels 0..4 is defined in EP9301 and EP9302 datasheets.
  16 EP9307, EP9312 and EP9315 have 3 channels more (total 8), but the numbering is
  17 not defined. So the last three are numbered randomly, let's say.
  18
  19 Assuming ep93xx_adc is IIO device0, you'd find the following entries under
  20 /sys/bus/iio/devices/iio:device0/:
  21
  22   +-----------------+---------------+
  23   | sysfs entry     | ball/pin name |
  24   +=================+===============+
  25   | in_voltage0_raw | YM            |
  26   +-----------------+---------------+
  27   | in_voltage1_raw | SXP           |
  28   +-----------------+---------------+
  29   | in_voltage2_raw | SXM           |
  30   +-----------------+---------------+
  31   | in_voltage3_raw | SYP           |
  32   +-----------------+---------------+
  33   | in_voltage4_raw | SYM           |
  34   +-----------------+---------------+
  35   | in_voltage5_raw | XP            |
  36   +-----------------+---------------+
  37   | in_voltage6_raw | XM            |
  38   +-----------------+---------------+
  39   | in_voltage7_raw | YP            |
  40   +-----------------+---------------+