projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 8614206a AS |
1 | Cirrus Logic EP93xx ADC driver. |
| 2 | ||
| 3 | 1. Overview | |
| 4 | ||
| 5 | The driver is intended to work on both low-end (EP9301, EP9302) devices with | |
| 6 | 5-channel ADC and high-end (EP9307, EP9312, EP9315) devices with 10-channel | |
| 7 | touchscreen/ADC module. | |
| 8 | ||
| 9 | 2. Channel numbering | |
| 10 | ||
| 11 | Numbering scheme for channels 0..4 is defined in EP9301 and EP9302 datasheets. | |
| 12 | EP9307, EP9312 and EP9312 have 3 channels more (total 8), but the numbering is | |
| 13 | not defined. So the last three are numbered randomly, let's say. | |
| 14 | ||
| 15 | Assuming ep93xx_adc is IIO device0, you'd find the following entries under | |
| 16 | /sys/bus/iio/devices/iio:device0/: | |
| 17 | ||
| 18 | +-----------------+---------------+ | |
| 19 | | sysfs entry | ball/pin name | | |
| 20 | +-----------------+---------------+ | |
| 21 | | in_voltage0_raw | YM | | |
| 22 | | in_voltage1_raw | SXP | | |
| 23 | | in_voltage2_raw | SXM | | |
| 24 | | in_voltage3_raw | SYP | | |
| 25 | | in_voltage4_raw | SYM | | |
| 26 | | in_voltage5_raw | XP | | |
| 27 | | in_voltage6_raw | XM | | |
| 28 | | in_voltage7_raw | YP | | |
| 29 | +-----------------+---------------+ |