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 refactoring the driver code. Most notably: the low-level read/write routines are split into more specialized, smaller functions that no longer perform functionality checks at runtime. Minor readability tweaks are also included. 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. Bartosz Golaszewski (14): eeprom: at24: improve the device_id table readability eeprom: at24: move at24_read() below at24_eeprom_write() eeprom: at24: coding style fixes eeprom: at24: call read/write functions via function pointers eeprom: at24: hide the read/write loop behind a macro eeprom: at24: split at24_eeprom_read() into specialized functions eeprom: at24: split at24_eeprom_write() into specialized functions eeprom: at24: platform_data: use BIT() macro eeprom: at24: platform_data: add serial number flag eeprom: at24: support reading the serial number eeprom: at24: add the at24cs series to the list of supported devices eeprom: at24: platform_data: 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 | 498 +++++++++++++++++++++++++------------ include/linux/platform_data/at24.h | 11 +- 2 files changed, 350 insertions(+), 159 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
