Read out otp memory zone of this secure eeprom and rng chip. The chip has an otp zone and data zone, both still not accessed. The otp zone can be used to store persistently serial numbers or similar, if externally pre-configured. In any way the Atmel SHA204a needs to be preconfgured and fuse locked in order to be useful also for the already implemented RNG functionality. Placing data into the otp zone is optional. If empty, the chip returns 0xff on all field. The implementation passes the content to a new sysfs handle to userspace. If the chip is locked or not accessible no sysfs handle is set. Signed-off-by: Lothar Rubusch <l.rubusch@xxxxxxxxx> --- v1 -> v2 - fix typo in commit title - drop patch: remove unused includes Lothar Rubusch (4): crypto: atmel-i2c - add missing arg description crypto: atmel-i2c - rename read function crypto: atmel-sha204a - add reading from otp zone crypto: atmel-sha204a - provide the otp content drivers/crypto/atmel-i2c.c | 30 +++++++++++++-- drivers/crypto/atmel-i2c.h | 8 +++- drivers/crypto/atmel-sha204a.c | 68 ++++++++++++++++++++++++++++++++++ 3 files changed, 102 insertions(+), 4 deletions(-) -- 2.25.1
