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This is a Linux industrial I/O (IIO) subsystem driver, targeting Resolver-to-Digital Converters. The industrial I/O subsystem provides a unified framework for drivers for many different types of converters and sensors using a number of different physical interfaces (i2c, spi, etc). See IIO for more information.
| Function | File |
|---|---|
| driver | drivers/staging/iio/resolver/ad2s1210.c |
Configure kernel with “make menuconfig” (alternatively use “make xconfig” or “make qconfig”)
The Driver depends on CONFIG_SPI
Linux Kernel Configuration Device Drivers ---> [*] Staging drivers ---> <*> Industrial I/O support ---> --- Industrial I/O support -*- Enable ring buffer support within IIO -*- Industrial I/O lock free software ring -*- Enable triggered sampling support *** Resolver to digital converters *** [--snip--] <*> Analog Devices AD2S1210 driver [--snip--]
The device file path may looks like,
/sys/devices/platform/bfin-spi.0/spi0.3/iio/device0/ad2s1210>
There are two files:
| File Name | Permission | Usage |
|---|---|---|
| raw_io | read/write | raw SPI read/write |
| reset | write only | soft reset |
| fclkin | read/write | show/store input clock |
| fexcit | read/write | show/store excitation clock |
| control | read/write | show/store control register |
| bits | read/write | show/store resolution |
| fault | read only | show fault register |
| pos | read only | 10/12/14/16 bits unsigned angular value |
| vel | read only | 10/12/14/16 bits signed velocity value |
| pos_vel | read only | 10/12/14/16 bits unsigned angular and signed velocity value |
| los_thrd | read/write | show/store los threshold register |
| dos_ovr_thrd | read/write | show/store dos overange register |
| dos_mis_thrd | read/write | show/store dos mismatch register |
| dos_rst_max_thrd | read/write | show/store dos reset maximum register |
| dos_rst_min_thrd | read/write | show/store dos reset minimum register |
| lot_high_thrd | read/write | show/store lot high threshold |
| lot_low_thrd | read/write | show/store lot low threshold |
| description | read only | description about this chip |
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