Linux IIO driver - write/read complete configuration to the chip

Question

What is the best option to write/read complete configuration to the chip, if I'm using a IIO driver? With 'complete configuration' I mean a file (eg chip_config.cfg) where are the values of all registers of that chip in some specific format.

What options do I know now:

1. Device attribute - can be created directly from IIO framework, however it should be used only for one value. Also can read only 4096 bytes of data.
2. Open file from kernel - kernel_read_file() and similar functions, but strictly prohibited.
3. Firmware framework - only write.
4. debugfs - we do not want to use this.

Thank you for every suggestion.

Answer 1

this should be done in two parts: a user space one that reads and parses the file, and a driver that reads and writes to the chip.

You can't use the firmware framework you mentioned above, ie write only: because you usually need to read from the device registers; to check if certain bits are set; read back values from registers you've written to; and so on.