Chips from the at24cs EEPROM series have an additional read-only memory area containing a factory pre-programmed serial number. In order to access it, a dummy write must be executed before reading the serial number bytes. Chips from the at24mac familiy, apart from the serial number, have a second special memory area containing a factory programmed EUI-48/EUI64 mac address. The read-only serial/mac memory area is accessible on a different i2c slave address (addr + 0x08). This patchset makes it possible to instantiate a separate at24 device on this second address and access the read-only area through the regular eeprom sysfs attribute or the new nvmem subsystem. This series also contains several patches intoducing some minor tweaks and refactoring. Tested with at24cs32 and at24cs02 chips (for both 16 and 8 bit address pointers). I have no means of testing the support for at24mac chips, I relied solely on the datasheet. v2: - fixed the 'assignment from incompatible pointer type' bug reported by kbuild v1: https://lkml.org/lkml/2016/3/24/337 Bartosz Golaszewski (13): eeprom: at24: remove a reduntant if eeprom: at24: improve the device_id table readability eeprom: at24: platform_data: use BIT() macro eeprom: at24: make locking more fine-grained eeprom: at24: replace msleep() with usleep_range() eeprom: at24: add serial number flag eeprom: at24: support reading of the serial number eeprom: at24: call read and write routines via function pointers eeprom: at24: use at24cs_serial_read() eeprom: at24: add the at24cs series to the list of supported devices eeprom: at24: add at24mac series flag eeprom: at24: add support for at24mac series eeprom: at24: add at24mac chips to the list of supported devices drivers/misc/eeprom/at24.c | 201 ++++++++++++++++++++++++++++--------- include/linux/platform_data/at24.h | 10 +- 2 files changed, 162 insertions(+), 49 deletions(-) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
