ads7138_i2c_read_block
ret = ads7138_i2c_read_block(client, reg, &value, sizeof(value));
ret = ads7138_i2c_read_block(data->client,
ret = ads7138_i2c_read_block(data->client,
ret = ads7138_i2c_read_block(data->client,
ret = ads7138_i2c_read_block(data->client, reg, values,