This change adds statistics to the i2c_adapter structure as Wolfram previously suggested (https://lore.kernel.org/linux-i2c/YgEYEk355t8C4J1x@shikoro/). It also adds relevant statistics to the per-address i2c_clients where applicable. The list of statistics are: - bus_errors - nacks - recovery_successes / recovery_failures (only applicable to i2c_adapter) - timeouts - messages (only applicable to i2c_client) - transfers (only applicable to i2c_adapter) The statistics are located in /sys/class/i2c-adapter/i2c-x/stats and /sys/class/i2c-adapter/i2c-x/x-xxxx/stats respectively. Since the counting is done in __i2c_transfer, where the number of messages transferred is not known upon error, the error counters are attributed to all unique addresses that appear in the message list passed into __i2c_transfer. Currently an rbtree is used to find the i2c_client located at a certain address. Would be happy to know if there is a better way of doing this. Thanks! Sui Chen (1): i2c debug counters as sysfs attributes drivers/i2c/i2c-core-base.c | 240 +++++++++++++++++++++++++++++++++++- drivers/i2c/i2c-dev.c | 94 ++++++++++++++ include/linux/i2c.h | 41 ++++++ 3 files changed, 374 insertions(+), 1 deletion(-) -- 2.36.0.550.gb090851708-goog
