173 	uint8_t checksum = 0;  in bq274xx_write_block()  local
189 		checksum += block[i];  in bq274xx_write_block()
191 	checksum = 0xff - checksum;  in bq274xx_write_block()
193 	ret = i2c_reg_write_byte_dt(&config->i2c, BQ274XX_EXT_CHECKSUM, checksum);  in bq274xx_write_block()
195 		LOG_ERR("Failed to update block checksum");  in bq274xx_write_block()
270 	uint8_t val, checksum;  in bq27427_ccgain_quirk()  local
298 	ret = i2c_reg_read_byte_dt(&config->i2c, BQ274XX_EXT_CHECKSUM, &checksum);  in bq27427_ccgain_quirk()
300 		LOG_ERR("Failed to read block checksum");  in bq27427_ccgain_quirk()
304 	/* Flip the sign bit on both value and checksum. */  in bq27427_ccgain_quirk()
306 	checksum ^= BQ27427_CC_GAIN_SIGN_BIT;  in bq27427_ccgain_quirk()
308 	LOG_DBG("bq27427: val=%02x checksum=%02x", val, checksum);  in bq27427_ccgain_quirk()
316 	ret = i2c_reg_write_byte_dt(&config->i2c, BQ274XX_EXT_CHECKSUM, checksum);  in bq27427_ccgain_quirk()
318 		LOG_ERR("Failed to update block checksum");  in bq27427_ccgain_quirk()