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1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 | // SPDX-License-Identifier: GPL-2.0 /* * mlx90632.c - Melexis MLX90632 contactless IR temperature sensor * * Copyright (c) 2017 Melexis <cmo@melexis.com> * * Driver for the Melexis MLX90632 I2C 16-bit IR thermopile sensor */ #include <linux/bitfield.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/err.h> #include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/iopoll.h> #include <linux/jiffies.h> #include <linux/kernel.h> #include <linux/limits.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/math64.h> #include <linux/pm_runtime.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> /* Memory sections addresses */ #define MLX90632_ADDR_RAM 0x4000 /* Start address of ram */ #define MLX90632_ADDR_EEPROM 0x2480 /* Start address of user eeprom */ /* EEPROM addresses - used at startup */ #define MLX90632_EE_CTRL 0x24d4 /* Control register initial value */ #define MLX90632_EE_I2C_ADDR 0x24d5 /* I2C address register initial value */ #define MLX90632_EE_VERSION 0x240b /* EEPROM version reg address */ #define MLX90632_EE_P_R 0x240c /* P_R calibration register 32bit */ #define MLX90632_EE_P_G 0x240e /* P_G calibration register 32bit */ #define MLX90632_EE_P_T 0x2410 /* P_T calibration register 32bit */ #define MLX90632_EE_P_O 0x2412 /* P_O calibration register 32bit */ #define MLX90632_EE_Aa 0x2414 /* Aa calibration register 32bit */ #define MLX90632_EE_Ab 0x2416 /* Ab calibration register 32bit */ #define MLX90632_EE_Ba 0x2418 /* Ba calibration register 32bit */ #define MLX90632_EE_Bb 0x241a /* Bb calibration register 32bit */ #define MLX90632_EE_Ca 0x241c /* Ca calibration register 32bit */ #define MLX90632_EE_Cb 0x241e /* Cb calibration register 32bit */ #define MLX90632_EE_Da 0x2420 /* Da calibration register 32bit */ #define MLX90632_EE_Db 0x2422 /* Db calibration register 32bit */ #define MLX90632_EE_Ea 0x2424 /* Ea calibration register 32bit */ #define MLX90632_EE_Eb 0x2426 /* Eb calibration register 32bit */ #define MLX90632_EE_Fa 0x2428 /* Fa calibration register 32bit */ #define MLX90632_EE_Fb 0x242a /* Fb calibration register 32bit */ #define MLX90632_EE_Ga 0x242c /* Ga calibration register 32bit */ #define MLX90632_EE_Gb 0x242e /* Gb calibration register 16bit */ #define MLX90632_EE_Ka 0x242f /* Ka calibration register 16bit */ #define MLX90632_EE_Ha 0x2481 /* Ha customer calib value reg 16bit */ #define MLX90632_EE_Hb 0x2482 /* Hb customer calib value reg 16bit */ #define MLX90632_EE_MEDICAL_MEAS1 0x24E1 /* Medical measurement 1 16bit */ #define MLX90632_EE_MEDICAL_MEAS2 0x24E2 /* Medical measurement 2 16bit */ #define MLX90632_EE_EXTENDED_MEAS1 0x24F1 /* Extended measurement 1 16bit */ #define MLX90632_EE_EXTENDED_MEAS2 0x24F2 /* Extended measurement 2 16bit */ #define MLX90632_EE_EXTENDED_MEAS3 0x24F3 /* Extended measurement 3 16bit */ /* Register addresses - volatile */ #define MLX90632_REG_I2C_ADDR 0x3000 /* Chip I2C address register */ /* Control register address - volatile */ #define MLX90632_REG_CONTROL 0x3001 /* Control Register address */ #define MLX90632_CFG_PWR_MASK GENMASK(2, 1) /* PowerMode Mask */ #define MLX90632_CFG_MTYP_MASK GENMASK(8, 4) /* Meas select Mask */ #define MLX90632_CFG_SOB_MASK BIT(11) /* PowerModes statuses */ #define MLX90632_PWR_STATUS(ctrl_val) (ctrl_val << 1) #define MLX90632_PWR_STATUS_HALT MLX90632_PWR_STATUS(0) /* hold */ #define MLX90632_PWR_STATUS_SLEEP_STEP MLX90632_PWR_STATUS(1) /* sleep step */ #define MLX90632_PWR_STATUS_STEP MLX90632_PWR_STATUS(2) /* step */ #define MLX90632_PWR_STATUS_CONTINUOUS MLX90632_PWR_STATUS(3) /* continuous */ #define MLX90632_EE_RR GENMASK(10, 8) /* Only Refresh Rate bits */ #define MLX90632_REFRESH_RATE(ee_val) FIELD_GET(MLX90632_EE_RR, ee_val) /* Extract Refresh Rate from ee register */ #define MLX90632_REFRESH_RATE_STATUS(refresh_rate) (refresh_rate << 8) /* Measurement types */ #define MLX90632_MTYP_MEDICAL 0 #define MLX90632_MTYP_EXTENDED 17 /* Measurement type select*/ #define MLX90632_MTYP_STATUS(ctrl_val) (ctrl_val << 4) #define MLX90632_MTYP_STATUS_MEDICAL MLX90632_MTYP_STATUS(MLX90632_MTYP_MEDICAL) #define MLX90632_MTYP_STATUS_EXTENDED MLX90632_MTYP_STATUS(MLX90632_MTYP_EXTENDED) /* I2C command register - volatile */ #define MLX90632_REG_I2C_CMD 0x3005 /* I2C command Register address */ /* Device status register - volatile */ #define MLX90632_REG_STATUS 0x3fff /* Device status register */ #define MLX90632_STAT_BUSY BIT(10) /* Device busy indicator */ #define MLX90632_STAT_EE_BUSY BIT(9) /* EEPROM busy indicator */ #define MLX90632_STAT_BRST BIT(8) /* Brown out reset indicator */ #define MLX90632_STAT_CYCLE_POS GENMASK(6, 2) /* Data position */ #define MLX90632_STAT_DATA_RDY BIT(0) /* Data ready indicator */ /* RAM_MEAS address-es for each channel */ #define MLX90632_RAM_1(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num) #define MLX90632_RAM_2(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 1) #define MLX90632_RAM_3(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 2) /* Name important RAM_MEAS channels */ #define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1 MLX90632_RAM_3(17) #define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2 MLX90632_RAM_3(18) #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_1 MLX90632_RAM_1(17) #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_2 MLX90632_RAM_2(17) #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_3 MLX90632_RAM_1(18) #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_4 MLX90632_RAM_2(18) #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_5 MLX90632_RAM_1(19) #define MLX90632_RAM_DSP5_EXTENDED_OBJECT_6 MLX90632_RAM_2(19) /* Magic constants */ #define MLX90632_ID_MEDICAL 0x0105 /* EEPROM DSPv5 Medical device id */ #define MLX90632_ID_CONSUMER 0x0205 /* EEPROM DSPv5 Consumer device id */ #define MLX90632_ID_EXTENDED 0x0505 /* EEPROM DSPv5 Extended range device id */ #define MLX90632_ID_MASK GENMASK(14, 0) /* DSP version and device ID in EE_VERSION */ #define MLX90632_DSP_VERSION 5 /* DSP version */ #define MLX90632_DSP_MASK GENMASK(7, 0) /* DSP version in EE_VERSION */ #define MLX90632_RESET_CMD 0x0006 /* Reset sensor (address or global) */ #define MLX90632_REF_12 12LL /* ResCtrlRef value of Ch 1 or Ch 2 */ #define MLX90632_REF_3 12LL /* ResCtrlRef value of Channel 3 */ #define MLX90632_MAX_MEAS_NUM 31 /* Maximum measurements in list */ #define MLX90632_SLEEP_DELAY_MS 6000 /* Autosleep delay */ #define MLX90632_EXTENDED_LIMIT 27000 /* Extended mode raw value limit */ #define MLX90632_MEAS_MAX_TIME 2000 /* Max measurement time in ms for the lowest refresh rate */ /** * struct mlx90632_data - private data for the MLX90632 device * @client: I2C client of the device * @lock: Internal mutex for multiple reads for single measurement * @regmap: Regmap of the device * @emissivity: Object emissivity from 0 to 1000 where 1000 = 1. * @mtyp: Measurement type physical sensor configuration for extended range * calculations * @object_ambient_temperature: Ambient temperature at object (might differ of * the ambient temperature of sensor. * @regulator: Regulator of the device * @powerstatus: Current POWER status of the device * @interaction_ts: Timestamp of the last temperature read that is used * for power management in jiffies */ struct mlx90632_data { struct i2c_client *client; struct mutex lock; struct regmap *regmap; u16 emissivity; u8 mtyp; u32 object_ambient_temperature; struct regulator *regulator; int powerstatus; unsigned long interaction_ts; }; static const struct regmap_range mlx90632_volatile_reg_range[] = { regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL), regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD), regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS), regmap_reg_range(MLX90632_RAM_1(0), MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)), }; static const struct regmap_access_table mlx90632_volatile_regs_tbl = { .yes_ranges = mlx90632_volatile_reg_range, .n_yes_ranges = ARRAY_SIZE(mlx90632_volatile_reg_range), }; static const struct regmap_range mlx90632_read_reg_range[] = { regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka), regmap_reg_range(MLX90632_EE_CTRL, MLX90632_EE_I2C_ADDR), regmap_reg_range(MLX90632_EE_Ha, MLX90632_EE_Hb), regmap_reg_range(MLX90632_EE_MEDICAL_MEAS1, MLX90632_EE_MEDICAL_MEAS2), regmap_reg_range(MLX90632_EE_EXTENDED_MEAS1, MLX90632_EE_EXTENDED_MEAS3), regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL), regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD), regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS), regmap_reg_range(MLX90632_RAM_1(0), MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)), }; static const struct regmap_access_table mlx90632_readable_regs_tbl = { .yes_ranges = mlx90632_read_reg_range, .n_yes_ranges = ARRAY_SIZE(mlx90632_read_reg_range), }; static const struct regmap_range mlx90632_no_write_reg_range[] = { regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka), regmap_reg_range(MLX90632_RAM_1(0), MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)), }; static const struct regmap_access_table mlx90632_writeable_regs_tbl = { .no_ranges = mlx90632_no_write_reg_range, .n_no_ranges = ARRAY_SIZE(mlx90632_no_write_reg_range), }; static const struct regmap_config mlx90632_regmap = { .reg_bits = 16, .val_bits = 16, .volatile_table = &mlx90632_volatile_regs_tbl, .rd_table = &mlx90632_readable_regs_tbl, .wr_table = &mlx90632_writeable_regs_tbl, .use_single_read = true, .use_single_write = true, .reg_format_endian = REGMAP_ENDIAN_BIG, .val_format_endian = REGMAP_ENDIAN_BIG, .cache_type = REGCACHE_RBTREE, }; static int mlx90632_pwr_set_sleep_step(struct regmap *regmap) { struct mlx90632_data *data = iio_priv(dev_get_drvdata(regmap_get_device(regmap))); int ret; if (data->powerstatus == MLX90632_PWR_STATUS_SLEEP_STEP) return 0; ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL, MLX90632_CFG_PWR_MASK, MLX90632_PWR_STATUS_SLEEP_STEP); if (ret < 0) return ret; data->powerstatus = MLX90632_PWR_STATUS_SLEEP_STEP; return 0; } static int mlx90632_pwr_continuous(struct regmap *regmap) { struct mlx90632_data *data = iio_priv(dev_get_drvdata(regmap_get_device(regmap))); int ret; if (data->powerstatus == MLX90632_PWR_STATUS_CONTINUOUS) return 0; ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL, MLX90632_CFG_PWR_MASK, MLX90632_PWR_STATUS_CONTINUOUS); if (ret < 0) return ret; data->powerstatus = MLX90632_PWR_STATUS_CONTINUOUS; return 0; } /** * mlx90632_reset_delay() - Give the mlx90632 some time to reset properly * If this is not done, the following I2C command(s) will not be accepted. */ static void mlx90632_reset_delay(void) { usleep_range(150, 200); } static int mlx90632_get_measurement_time(struct regmap *regmap, u16 meas) { unsigned int reg; int ret; ret = regmap_read(regmap, meas, ®); if (ret < 0) return ret; return MLX90632_MEAS_MAX_TIME >> FIELD_GET(MLX90632_EE_RR, reg); } static int mlx90632_calculate_dataset_ready_time(struct mlx90632_data *data) { unsigned int refresh_time; int ret; if (data->mtyp == MLX90632_MTYP_MEDICAL) { ret = mlx90632_get_measurement_time(data->regmap, MLX90632_EE_MEDICAL_MEAS1); if (ret < 0) return ret; refresh_time = ret; ret = mlx90632_get_measurement_time(data->regmap, MLX90632_EE_MEDICAL_MEAS2); if (ret < 0) return ret; refresh_time += ret; } else { ret = mlx90632_get_measurement_time(data->regmap, MLX90632_EE_EXTENDED_MEAS1); if (ret < 0) return ret; refresh_time = ret; ret = mlx90632_get_measurement_time(data->regmap, MLX90632_EE_EXTENDED_MEAS2); if (ret < 0) return ret; refresh_time += ret; ret = mlx90632_get_measurement_time(data->regmap, MLX90632_EE_EXTENDED_MEAS3); if (ret < 0) return ret; refresh_time += ret; } return refresh_time; } /** * mlx90632_perform_measurement() - Trigger and retrieve current measurement cycle * @data: pointer to mlx90632_data object containing regmap information * * Perform a measurement and return latest measurement cycle position reported * by sensor. This is a blocking function for 500ms, as that is default sensor * refresh rate. */ static int mlx90632_perform_measurement(struct mlx90632_data *data) { unsigned int reg_status; int ret; ret = regmap_update_bits(data->regmap, MLX90632_REG_STATUS, MLX90632_STAT_DATA_RDY, 0); if (ret < 0) return ret; ret = regmap_read_poll_timeout(data->regmap, MLX90632_REG_STATUS, reg_status, !(reg_status & MLX90632_STAT_DATA_RDY), 10000, 100 * 10000); if (ret < 0) { dev_err(&data->client->dev, "data not ready"); return -ETIMEDOUT; } return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2; } /** * mlx90632_perform_measurement_burst() - Trigger and retrieve current measurement * cycle in step sleep mode * @data: pointer to mlx90632_data object containing regmap information * * Perform a measurement and return 2 as measurement cycle position reported * by sensor. This is a blocking function for amount dependent on the sensor * refresh rate. */ static int mlx90632_perform_measurement_burst(struct mlx90632_data *data) { unsigned int reg_status; int ret; ret = regmap_write_bits(data->regmap, MLX90632_REG_CONTROL, MLX90632_CFG_SOB_MASK, MLX90632_CFG_SOB_MASK); if (ret < 0) return ret; ret = mlx90632_calculate_dataset_ready_time(data); if (ret < 0) return ret; msleep(ret); /* Wait minimum time for dataset to be ready */ ret = regmap_read_poll_timeout(data->regmap, MLX90632_REG_STATUS, reg_status, (reg_status & MLX90632_STAT_BUSY) == 0, 10000, 100 * 10000); if (ret < 0) { dev_err(&data->client->dev, "data not ready"); return -ETIMEDOUT; } return 2; } static int mlx90632_set_meas_type(struct mlx90632_data *data, u8 type) { int current_powerstatus; int ret; if (data->mtyp == type) return 0; current_powerstatus = data->powerstatus; ret = mlx90632_pwr_continuous(data->regmap); if (ret < 0) return ret; ret = regmap_write(data->regmap, MLX90632_REG_I2C_CMD, MLX90632_RESET_CMD); if (ret < 0) return ret; mlx90632_reset_delay(); ret = regmap_update_bits(data->regmap, MLX90632_REG_CONTROL, (MLX90632_CFG_MTYP_MASK | MLX90632_CFG_PWR_MASK), (MLX90632_MTYP_STATUS(type) | MLX90632_PWR_STATUS_HALT)); if (ret < 0) return ret; data->mtyp = type; data->powerstatus = MLX90632_PWR_STATUS_HALT; if (current_powerstatus == MLX90632_PWR_STATUS_SLEEP_STEP) return mlx90632_pwr_set_sleep_step(data->regmap); return mlx90632_pwr_continuous(data->regmap); } static int mlx90632_channel_new_select(int perform_ret, uint8_t *channel_new, uint8_t *channel_old) { switch (perform_ret) { case 1: *channel_new = 1; *channel_old = 2; break; case 2: *channel_new = 2; *channel_old = 1; break; default: return -ECHRNG; } return 0; } static int mlx90632_read_ambient_raw(struct regmap *regmap, s16 *ambient_new_raw, s16 *ambient_old_raw) { unsigned int read_tmp; int ret; ret = regmap_read(regmap, MLX90632_RAM_3(1), &read_tmp); if (ret < 0) return ret; *ambient_new_raw = (s16)read_tmp; ret = regmap_read(regmap, MLX90632_RAM_3(2), &read_tmp); if (ret < 0) return ret; *ambient_old_raw = (s16)read_tmp; return ret; } static int mlx90632_read_object_raw(struct regmap *regmap, int perform_measurement_ret, s16 *object_new_raw, s16 *object_old_raw) { unsigned int read_tmp; u8 channel_old = 0; u8 channel = 0; s16 read; int ret; ret = mlx90632_channel_new_select(perform_measurement_ret, &channel, &channel_old); if (ret != 0) return ret; ret = regmap_read(regmap, MLX90632_RAM_2(channel), &read_tmp); if (ret < 0) return ret; read = (s16)read_tmp; ret = regmap_read(regmap, MLX90632_RAM_1(channel), &read_tmp); if (ret < 0) return ret; *object_new_raw = (read + (s16)read_tmp) / 2; ret = regmap_read(regmap, MLX90632_RAM_2(channel_old), &read_tmp); if (ret < 0) return ret; read = (s16)read_tmp; ret = regmap_read(regmap, MLX90632_RAM_1(channel_old), &read_tmp); if (ret < 0) return ret; *object_old_raw = (read + (s16)read_tmp) / 2; return ret; } static int mlx90632_read_all_channel(struct mlx90632_data *data, s16 *ambient_new_raw, s16 *ambient_old_raw, s16 *object_new_raw, s16 *object_old_raw) { s32 measurement; int ret; mutex_lock(&data->lock); ret = mlx90632_set_meas_type(data, MLX90632_MTYP_MEDICAL); if (ret < 0) goto read_unlock; switch (data->powerstatus) { case MLX90632_PWR_STATUS_CONTINUOUS: ret = mlx90632_perform_measurement(data); if (ret < 0) goto read_unlock; break; case MLX90632_PWR_STATUS_SLEEP_STEP: ret = mlx90632_perform_measurement_burst(data); if (ret < 0) goto read_unlock; break; default: ret = -EOPNOTSUPP; goto read_unlock; } measurement = ret; /* If we came here ret holds the measurement position */ ret = mlx90632_read_ambient_raw(data->regmap, ambient_new_raw, ambient_old_raw); if (ret < 0) goto read_unlock; ret = mlx90632_read_object_raw(data->regmap, measurement, object_new_raw, object_old_raw); read_unlock: mutex_unlock(&data->lock); return ret; } static int mlx90632_read_ambient_raw_extended(struct regmap *regmap, s16 *ambient_new_raw, s16 *ambient_old_raw) { unsigned int read_tmp; int ret; ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1, &read_tmp); if (ret < 0) return ret; *ambient_new_raw = (s16)read_tmp; ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2, &read_tmp); if (ret < 0) return ret; *ambient_old_raw = (s16)read_tmp; return 0; } static int mlx90632_read_object_raw_extended(struct regmap *regmap, s16 *object_new_raw) { unsigned int read_tmp; s32 read; int ret; ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_1, &read_tmp); if (ret < 0) return ret; read = (s16)read_tmp; ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_2, &read_tmp); if (ret < 0) return ret; read = read - (s16)read_tmp; ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_3, &read_tmp); if (ret < 0) return ret; read = read - (s16)read_tmp; ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_4, &read_tmp); if (ret < 0) return ret; read = (read + (s16)read_tmp) / 2; ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_5, &read_tmp); if (ret < 0) return ret; read = read + (s16)read_tmp; ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_6, &read_tmp); if (ret < 0) return ret; read = read + (s16)read_tmp; if (read > S16_MAX || read < S16_MIN) return -ERANGE; *object_new_raw = read; return 0; } static int mlx90632_read_all_channel_extended(struct mlx90632_data *data, s16 *object_new_raw, s16 *ambient_new_raw, s16 *ambient_old_raw) { s32 ret, meas; mutex_lock(&data->lock); ret = mlx90632_set_meas_type(data, MLX90632_MTYP_EXTENDED); if (ret < 0) goto read_unlock; switch (data->powerstatus) { case MLX90632_PWR_STATUS_CONTINUOUS: ret = read_poll_timeout(mlx90632_perform_measurement, meas, meas == 19, 50000, 800000, false, data); if (ret) goto read_unlock; break; case MLX90632_PWR_STATUS_SLEEP_STEP: ret = mlx90632_perform_measurement_burst(data); if (ret < 0) goto read_unlock; break; default: ret = -EOPNOTSUPP; goto read_unlock; } ret = mlx90632_read_object_raw_extended(data->regmap, object_new_raw); if (ret < 0) goto read_unlock; ret = mlx90632_read_ambient_raw_extended(data->regmap, ambient_new_raw, ambient_old_raw); read_unlock: mutex_unlock(&data->lock); return ret; } static int mlx90632_read_ee_register(struct regmap *regmap, u16 reg_lsb, s32 *reg_value) { unsigned int read; u32 value; int ret; ret = regmap_read(regmap, reg_lsb, &read); if (ret < 0) return ret; value = read; ret = regmap_read(regmap, reg_lsb + 1, &read); if (ret < 0) return ret; *reg_value = (read << 16) | (value & 0xffff); return 0; } static s64 mlx90632_preprocess_temp_amb(s16 ambient_new_raw, s16 ambient_old_raw, s16 Gb) { s64 VR_Ta, kGb, tmp; kGb = ((s64)Gb * 1000LL) >> 10ULL; VR_Ta = (s64)ambient_old_raw * 1000000LL + kGb * div64_s64(((s64)ambient_new_raw * 1000LL), (MLX90632_REF_3)); tmp = div64_s64( div64_s64(((s64)ambient_new_raw * 1000000000000LL), (MLX90632_REF_3)), VR_Ta); return div64_s64(tmp << 19ULL, 1000LL); } static s64 mlx90632_preprocess_temp_obj(s16 object_new_raw, s16 object_old_raw, s16 ambient_new_raw, s16 ambient_old_raw, s16 Ka) { s64 VR_IR, kKa, tmp; kKa = ((s64)Ka * 1000LL) >> 10ULL; VR_IR = (s64)ambient_old_raw * 1000000LL + kKa * div64_s64(((s64)ambient_new_raw * 1000LL), (MLX90632_REF_3)); tmp = div64_s64( div64_s64(((s64)((object_new_raw + object_old_raw) / 2) * 1000000000000LL), (MLX90632_REF_12)), VR_IR); return div64_s64((tmp << 19ULL), 1000LL); } static s64 mlx90632_preprocess_temp_obj_extended(s16 object_new_raw, s16 ambient_new_raw, s16 ambient_old_raw, s16 Ka) { s64 VR_IR, kKa, tmp; kKa = ((s64)Ka * 1000LL) >> 10ULL; VR_IR = (s64)ambient_old_raw * 1000000LL + kKa * div64_s64((s64)ambient_new_raw * 1000LL, MLX90632_REF_3); tmp = div64_s64( div64_s64((s64) object_new_raw * 1000000000000LL, MLX90632_REF_12), VR_IR); return div64_s64(tmp << 19ULL, 1000LL); } static s32 mlx90632_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw, s32 P_T, s32 P_R, s32 P_G, s32 P_O, s16 Gb) { s64 Asub, Bsub, Ablock, Bblock, Cblock, AMB, sum; AMB = mlx90632_preprocess_temp_amb(ambient_new_raw, ambient_old_raw, Gb); Asub = ((s64)P_T * 10000000000LL) >> 44ULL; Bsub = AMB - (((s64)P_R * 1000LL) >> 8ULL); Ablock = Asub * (Bsub * Bsub); Bblock = (div64_s64(Bsub * 10000000LL, P_G)) << 20ULL; Cblock = ((s64)P_O * 10000000000LL) >> 8ULL; sum = div64_s64(Ablock, 1000000LL) + Bblock + Cblock; return div64_s64(sum, 10000000LL); } static s32 mlx90632_calc_temp_object_iteration(s32 prev_object_temp, s64 object, s64 TAdut, s64 TAdut4, s32 Fa, s32 Fb, s32 Ga, s16 Ha, s16 Hb, u16 emissivity) { s64 calcedKsTO, calcedKsTA, ir_Alpha, Alpha_corr; s64 Ha_customer, Hb_customer; Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL; Hb_customer = ((s64)Hb * 100) >> 10ULL; calcedKsTO = ((s64)((s64)Ga * (prev_object_temp - 25 * 1000LL) * 1000LL)) >> 36LL; calcedKsTA = ((s64)(Fb * (TAdut - 25 * 1000000LL))) >> 36LL; Alpha_corr = div64_s64((((s64)(Fa * 10000000000LL) >> 46LL) * Ha_customer), 1000LL); Alpha_corr *= ((s64)(1 * 1000000LL + calcedKsTO + calcedKsTA)); Alpha_corr = emissivity * div64_s64(Alpha_corr, 100000LL); Alpha_corr = div64_s64(Alpha_corr, 1000LL); ir_Alpha = div64_s64((s64)object * 10000000LL, Alpha_corr); return (int_sqrt64(int_sqrt64(ir_Alpha * 1000000000000LL + TAdut4)) - 27315 - Hb_customer) * 10; } static s64 mlx90632_calc_ta4(s64 TAdut, s64 scale) { return (div64_s64(TAdut, scale) + 27315) * (div64_s64(TAdut, scale) + 27315) * (div64_s64(TAdut, scale) + 27315) * (div64_s64(TAdut, scale) + 27315); } static s32 mlx90632_calc_temp_object(s64 object, s64 ambient, s32 Ea, s32 Eb, s32 Fa, s32 Fb, s32 Ga, s16 Ha, s16 Hb, u16 tmp_emi) { s64 kTA, kTA0, TAdut, TAdut4; s64 temp = 25000; s8 i; kTA = (Ea * 1000LL) >> 16LL; kTA0 = (Eb * 1000LL) >> 8LL; TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 25 * 1000000LL; TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL); /* Iterations of calculation as described in datasheet */ for (i = 0; i < 5; ++i) { temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TAdut4, Fa, Fb, Ga, Ha, Hb, tmp_emi); } return temp; } static s32 mlx90632_calc_temp_object_extended(s64 object, s64 ambient, s64 reflected, s32 Ea, s32 Eb, s32 Fa, s32 Fb, s32 Ga, s16 Ha, s16 Hb, u16 tmp_emi) { s64 kTA, kTA0, TAdut, TAdut4, Tr4, TaTr4; s64 temp = 25000; s8 i; kTA = (Ea * 1000LL) >> 16LL; kTA0 = (Eb * 1000LL) >> 8LL; TAdut = div64_s64((ambient - kTA0) * 1000000LL, kTA) + 25 * 1000000LL; Tr4 = mlx90632_calc_ta4(reflected, 10); TAdut4 = mlx90632_calc_ta4(TAdut, 10000LL); TaTr4 = Tr4 - div64_s64(Tr4 - TAdut4, tmp_emi) * 1000; /* Iterations of calculation as described in datasheet */ for (i = 0; i < 5; ++i) { temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, TaTr4, Fa / 2, Fb, Ga, Ha, Hb, tmp_emi); } return temp; } static int mlx90632_calc_object_dsp105(struct mlx90632_data *data, int *val) { s16 ambient_new_raw, ambient_old_raw, object_new_raw, object_old_raw; s32 Ea, Eb, Fa, Fb, Ga; unsigned int read_tmp; s64 object, ambient; s16 Ha, Hb, Gb, Ka; int ret; ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ea, &Ea); if (ret < 0) return ret; ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Eb, &Eb); if (ret < 0) return ret; ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fa, &Fa); if (ret < 0) return ret; ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Fb, &Fb); if (ret < 0) return ret; ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_Ga, &Ga); if (ret < 0) return ret; ret = regmap_read(data->regmap, MLX90632_EE_Ha, &read_tmp); if (ret < 0) return ret; Ha = (s16)read_tmp; ret = regmap_read(data->regmap, MLX90632_EE_Hb, &read_tmp); if (ret < 0) return ret; Hb = (s16)read_tmp; ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp); if (ret < 0) return ret; Gb = (s16)read_tmp; ret = regmap_read(data->regmap, MLX90632_EE_Ka, &read_tmp); if (ret < 0) return ret; Ka = (s16)read_tmp; ret = mlx90632_read_all_channel(data, &ambient_new_raw, &ambient_old_raw, &object_new_raw, &object_old_raw); if (ret < 0) return ret; if (object_new_raw > MLX90632_EXTENDED_LIMIT && data->mtyp == MLX90632_MTYP_EXTENDED) { ret = mlx90632_read_all_channel_extended(data, &object_new_raw, &ambient_new_raw, &ambient_old_raw); if (ret < 0) return ret; /* Use extended mode calculations */ ambient = mlx90632_preprocess_temp_amb(ambient_new_raw, ambient_old_raw, Gb); object = mlx90632_preprocess_temp_obj_extended(object_new_raw, ambient_new_raw, ambient_old_raw, Ka); *val = mlx90632_calc_temp_object_extended(object, ambient, data->object_ambient_temperature, Ea, Eb, Fa, Fb, Ga, Ha, Hb, data->emissivity); return 0; } ambient = mlx90632_preprocess_temp_amb(ambient_new_raw, ambient_old_raw, Gb); object = mlx90632_preprocess_temp_obj(object_new_raw, object_old_raw, ambient_new_raw, ambient_old_raw, Ka); *val = mlx90632_calc_temp_object(object, ambient, Ea, Eb, Fa, Fb, Ga, Ha, Hb, data->emissivity); return 0; } static int mlx90632_calc_ambient_dsp105(struct mlx90632_data *data, int *val) { s16 ambient_new_raw, ambient_old_raw; unsigned int read_tmp; s32 PT, PR, PG, PO; int ret; s16 Gb; ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_R, &PR); if (ret < 0) return ret; ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_G, &PG); if (ret < 0) return ret; ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_T, &PT); if (ret < 0) return ret; ret = mlx90632_read_ee_register(data->regmap, MLX90632_EE_P_O, &PO); if (ret < 0) return ret; ret = regmap_read(data->regmap, MLX90632_EE_Gb, &read_tmp); if (ret < 0) return ret; Gb = (s16)read_tmp; ret = mlx90632_read_ambient_raw(data->regmap, &ambient_new_raw, &ambient_old_raw); if (ret < 0) return ret; *val = mlx90632_calc_temp_ambient(ambient_new_raw, ambient_old_raw, PT, PR, PG, PO, Gb); return ret; } static int mlx90632_get_refresh_rate(struct mlx90632_data *data, int *refresh_rate) { unsigned int meas1; int ret; ret = regmap_read(data->regmap, MLX90632_EE_MEDICAL_MEAS1, &meas1); if (ret < 0) return ret; *refresh_rate = MLX90632_REFRESH_RATE(meas1); return ret; } static const int mlx90632_freqs[][2] = { {0, 500000}, {1, 0}, {2, 0}, {4, 0}, {8, 0}, {16, 0}, {32, 0}, {64, 0} }; /** * mlx90632_pm_interraction_wakeup() - Measure time between user interactions to change powermode * @data: pointer to mlx90632_data object containing interaction_ts information * * Switch to continuous mode when interaction is faster than MLX90632_MEAS_MAX_TIME. Update the * interaction_ts for each function call with the jiffies to enable measurement between function * calls. Initial value of the interaction_ts needs to be set before this function call. */ static int mlx90632_pm_interraction_wakeup(struct mlx90632_data *data) { unsigned long now; int ret; now = jiffies; if (time_in_range(now, data->interaction_ts, data->interaction_ts + msecs_to_jiffies(MLX90632_MEAS_MAX_TIME + 100))) { if (data->powerstatus == MLX90632_PWR_STATUS_SLEEP_STEP) { ret = mlx90632_pwr_continuous(data->regmap); if (ret < 0) return ret; } } data->interaction_ts = now; return 0; } static int mlx90632_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int *val, int *val2, long mask) { struct mlx90632_data *data = iio_priv(indio_dev); int ret; int cr; pm_runtime_get_sync(&data->client->dev); ret = mlx90632_pm_interraction_wakeup(data); if (ret < 0) goto mlx90632_read_raw_pm; switch (mask) { case IIO_CHAN_INFO_PROCESSED: switch (channel->channel2) { case IIO_MOD_TEMP_AMBIENT: ret = mlx90632_calc_ambient_dsp105(data, val); if (ret < 0) goto mlx90632_read_raw_pm; ret = IIO_VAL_INT; break; case IIO_MOD_TEMP_OBJECT: ret = mlx90632_calc_object_dsp105(data, val); if (ret < 0) goto mlx90632_read_raw_pm; ret = IIO_VAL_INT; break; default: ret = -EINVAL; break; } break; case IIO_CHAN_INFO_CALIBEMISSIVITY: if (data->emissivity == 1000) { *val = 1; *val2 = 0; } else { *val = 0; *val2 = data->emissivity * 1000; } ret = IIO_VAL_INT_PLUS_MICRO; break; case IIO_CHAN_INFO_CALIBAMBIENT: *val = data->object_ambient_temperature; ret = IIO_VAL_INT; break; case IIO_CHAN_INFO_SAMP_FREQ: ret = mlx90632_get_refresh_rate(data, &cr); if (ret < 0) goto mlx90632_read_raw_pm; *val = mlx90632_freqs[cr][0]; *val2 = mlx90632_freqs[cr][1]; ret = IIO_VAL_INT_PLUS_MICRO; break; default: ret = -EINVAL; break; } mlx90632_read_raw_pm: pm_runtime_mark_last_busy(&data->client->dev); pm_runtime_put_autosuspend(&data->client->dev); return ret; } static int mlx90632_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int val, int val2, long mask) { struct mlx90632_data *data = iio_priv(indio_dev); switch (mask) { case IIO_CHAN_INFO_CALIBEMISSIVITY: /* Confirm we are within 0 and 1.0 */ if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0)) return -EINVAL; data->emissivity = val * 1000 + val2 / 1000; return 0; case IIO_CHAN_INFO_CALIBAMBIENT: data->object_ambient_temperature = val; return 0; default: return -EINVAL; } } static int mlx90632_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long mask) { switch (mask) { case IIO_CHAN_INFO_SAMP_FREQ: *vals = (int *)mlx90632_freqs; *type = IIO_VAL_INT_PLUS_MICRO; *length = 2 * ARRAY_SIZE(mlx90632_freqs); return IIO_AVAIL_LIST; default: return -EINVAL; } } static const struct iio_chan_spec mlx90632_channels[] = { { .type = IIO_TEMP, .modified = 1, .channel2 = IIO_MOD_TEMP_AMBIENT, .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ), }, { .type = IIO_TEMP, .modified = 1, .channel2 = IIO_MOD_TEMP_OBJECT, .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | BIT(IIO_CHAN_INFO_CALIBAMBIENT), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ), }, }; static const struct iio_info mlx90632_info = { .read_raw = mlx90632_read_raw, .write_raw = mlx90632_write_raw, .read_avail = mlx90632_read_avail, }; static void mlx90632_sleep(void *_data) { struct mlx90632_data *data = _data; mlx90632_pwr_set_sleep_step(data->regmap); } static int mlx90632_suspend(struct mlx90632_data *data) { regcache_mark_dirty(data->regmap); dev_dbg(&data->client->dev, "Requesting suspend"); return mlx90632_pwr_set_sleep_step(data->regmap); } static int mlx90632_wakeup(struct mlx90632_data *data) { int ret; ret = regcache_sync(data->regmap); if (ret < 0) { dev_err(&data->client->dev, "Failed to sync regmap registers: %d\n", ret); return ret; } dev_dbg(&data->client->dev, "Requesting wake-up\n"); return mlx90632_pwr_continuous(data->regmap); } static void mlx90632_disable_regulator(void *_data) { struct mlx90632_data *data = _data; int ret; ret = regulator_disable(data->regulator); if (ret < 0) dev_err(regmap_get_device(data->regmap), "Failed to disable power regulator: %d\n", ret); } static int mlx90632_enable_regulator(struct mlx90632_data *data) { int ret; ret = regulator_enable(data->regulator); if (ret < 0) { dev_err(regmap_get_device(data->regmap), "Failed to enable power regulator!\n"); return ret; } mlx90632_reset_delay(); return ret; } static int mlx90632_probe(struct i2c_client *client) { const struct i2c_device_id *id = i2c_client_get_device_id(client); struct mlx90632_data *mlx90632; struct iio_dev *indio_dev; struct regmap *regmap; unsigned int read; int ret; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90632)); if (!indio_dev) { dev_err(&client->dev, "Failed to allocate device\n"); return -ENOMEM; } regmap = devm_regmap_init_i2c(client, &mlx90632_regmap); if (IS_ERR(regmap)) { ret = PTR_ERR(regmap); dev_err(&client->dev, "Failed to allocate regmap: %d\n", ret); return ret; } mlx90632 = iio_priv(indio_dev); i2c_set_clientdata(client, indio_dev); mlx90632->client = client; mlx90632->regmap = regmap; mlx90632->mtyp = MLX90632_MTYP_MEDICAL; mlx90632->powerstatus = MLX90632_PWR_STATUS_HALT; mutex_init(&mlx90632->lock); indio_dev->name = id->name; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->info = &mlx90632_info; indio_dev->channels = mlx90632_channels; indio_dev->num_channels = ARRAY_SIZE(mlx90632_channels); mlx90632->regulator = devm_regulator_get(&client->dev, "vdd"); if (IS_ERR(mlx90632->regulator)) return dev_err_probe(&client->dev, PTR_ERR(mlx90632->regulator), "failed to get vdd regulator"); ret = mlx90632_enable_regulator(mlx90632); if (ret < 0) return ret; ret = devm_add_action_or_reset(&client->dev, mlx90632_disable_regulator, mlx90632); if (ret < 0) { dev_err(&client->dev, "Failed to setup regulator cleanup action %d\n", ret); return ret; } ret = mlx90632_wakeup(mlx90632); if (ret < 0) { dev_err(&client->dev, "Wakeup failed: %d\n", ret); return ret; } ret = devm_add_action_or_reset(&client->dev, mlx90632_sleep, mlx90632); if (ret < 0) { dev_err(&client->dev, "Failed to setup low power cleanup action %d\n", ret); return ret; } ret = regmap_read(mlx90632->regmap, MLX90632_EE_VERSION, &read); if (ret < 0) { dev_err(&client->dev, "read of version failed: %d\n", ret); return ret; } read = read & MLX90632_ID_MASK; if (read == MLX90632_ID_MEDICAL) { dev_dbg(&client->dev, "Detected Medical EEPROM calibration %x\n", read); } else if (read == MLX90632_ID_CONSUMER) { dev_dbg(&client->dev, "Detected Consumer EEPROM calibration %x\n", read); } else if (read == MLX90632_ID_EXTENDED) { dev_dbg(&client->dev, "Detected Extended range EEPROM calibration %x\n", read); mlx90632->mtyp = MLX90632_MTYP_EXTENDED; } else if ((read & MLX90632_DSP_MASK) == MLX90632_DSP_VERSION) { dev_dbg(&client->dev, "Detected Unknown EEPROM calibration %x\n", read); } else { dev_err(&client->dev, "Wrong DSP version %x (expected %x)\n", read, MLX90632_DSP_VERSION); return -EPROTONOSUPPORT; } mlx90632->emissivity = 1000; mlx90632->object_ambient_temperature = 25000; /* 25 degrees milliCelsius */ mlx90632->interaction_ts = jiffies; /* Set initial value */ pm_runtime_get_noresume(&client->dev); pm_runtime_set_active(&client->dev); ret = devm_pm_runtime_enable(&client->dev); if (ret) return ret; pm_runtime_set_autosuspend_delay(&client->dev, MLX90632_SLEEP_DELAY_MS); pm_runtime_use_autosuspend(&client->dev); pm_runtime_put_autosuspend(&client->dev); return devm_iio_device_register(&client->dev, indio_dev); } static const struct i2c_device_id mlx90632_id[] = { { "mlx90632", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, mlx90632_id); static const struct of_device_id mlx90632_of_match[] = { { .compatible = "melexis,mlx90632" }, { } }; MODULE_DEVICE_TABLE(of, mlx90632_of_match); static int mlx90632_pm_suspend(struct device *dev) { struct mlx90632_data *data = iio_priv(dev_get_drvdata(dev)); int ret; ret = mlx90632_suspend(data); if (ret < 0) return ret; ret = regulator_disable(data->regulator); if (ret < 0) dev_err(regmap_get_device(data->regmap), "Failed to disable power regulator: %d\n", ret); return ret; } static int mlx90632_pm_resume(struct device *dev) { struct mlx90632_data *data = iio_priv(dev_get_drvdata(dev)); int ret; ret = mlx90632_enable_regulator(data); if (ret < 0) return ret; return mlx90632_wakeup(data); } static int mlx90632_pm_runtime_suspend(struct device *dev) { struct mlx90632_data *data = iio_priv(dev_get_drvdata(dev)); return mlx90632_pwr_set_sleep_step(data->regmap); } static const struct dev_pm_ops mlx90632_pm_ops = { SYSTEM_SLEEP_PM_OPS(mlx90632_pm_suspend, mlx90632_pm_resume) RUNTIME_PM_OPS(mlx90632_pm_runtime_suspend, NULL, NULL) }; static struct i2c_driver mlx90632_driver = { .driver = { .name = "mlx90632", .of_match_table = mlx90632_of_match, .pm = pm_ptr(&mlx90632_pm_ops), }, .probe = mlx90632_probe, .id_table = mlx90632_id, }; module_i2c_driver(mlx90632_driver); MODULE_AUTHOR("Crt Mori <cmo@melexis.com>"); MODULE_DESCRIPTION("Melexis MLX90632 contactless Infra Red temperature sensor driver"); MODULE_LICENSE("GPL v2"); |