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USB: cxacru: document how to interact with the flash memory 

These commands were found by accident... fortunately
it still works even if the flash memory is erased,
despite having no USB device IDs.

Some example sysfs code for raw command access:
  http://simon.arlott.org/pub/cxacru/raw.c

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Simon Arlott 2009-11-21 15:12:21 +00:00 committed by Greg Kroah-Hartman
parent 9fc950d322
commit c68bb0d738
1 changed files with 20 additions and 0 deletions
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20
drivers/usb/atm/cxacru.c
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@ -105,6 +105,26 @@ enum cxacru_cm_request {
CM_REQUEST_MAX,
};
/* commands for interaction with the flash memory
*
* read: response is the contents of the first 60 bytes of flash memory
* write: request contains the 60 bytes of data to write to flash memory
* response is the contents of the first 60 bytes of flash memory
*
* layout: PP PP VV VV MM MM MM MM MM MM ?? ?? SS SS SS SS SS SS SS SS
* SS SS SS SS SS SS SS SS 00 00 00 00 00 00 00 00 00 00 00 00
* 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
*
* P: le16 USB Product ID
* V: le16 USB Vendor ID
* M: be48 MAC Address
* S: le16 ASCII Serial Number
*/
enum cxacru_cm_flash {
CM_FLASH_READ = 0xa1,
CM_FLASH_WRITE = 0xa2
};
/* reply codes to the commands above */
enum cxacru_cm_status {
CM_STATUS_UNDEFINED,