| // 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/delay.h> |
| #include <linux/err.h> |
| #include <linux/gpio/consumer.h> |
| #include <linux/i2c.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/math64.h> |
| #include <linux/of.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/regmap.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 */ |
| |
| /* 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 */ |
| /* 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*/ |
| |
| /* 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) |
| |
| /* Magic constants */ |
| #define MLX90632_ID_MEDICAL 0x0105 /* EEPROM DSPv5 Medical device id */ |
| #define MLX90632_ID_CONSUMER 0x0205 /* EEPROM DSPv5 Consumer device id */ |
| #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 3000 /**< Autosleep delay */ |
| |
| struct mlx90632_data { |
| struct i2c_client *client; |
| struct mutex lock; /* Multiple reads for single measurement */ |
| struct regmap *regmap; |
| u16 emissivity; |
| }; |
| |
| static const struct regmap_range mlx90632_volatile_reg_range[] = { |
| regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL), |
| 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_REG_I2C_ADDR, MLX90632_REG_CONTROL), |
| 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 s32 mlx90632_pwr_set_sleep_step(struct regmap *regmap) |
| { |
| return regmap_update_bits(regmap, MLX90632_REG_CONTROL, |
| MLX90632_CFG_PWR_MASK, |
| MLX90632_PWR_STATUS_SLEEP_STEP); |
| } |
| |
| static s32 mlx90632_pwr_continuous(struct regmap *regmap) |
| { |
| return regmap_update_bits(regmap, MLX90632_REG_CONTROL, |
| MLX90632_CFG_PWR_MASK, |
| MLX90632_PWR_STATUS_CONTINUOUS); |
| } |
| |
| /** |
| * 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) |
| { |
| int ret, tries = 100; |
| unsigned int reg_status; |
| |
| ret = regmap_update_bits(data->regmap, MLX90632_REG_STATUS, |
| MLX90632_STAT_DATA_RDY, 0); |
| if (ret < 0) |
| return ret; |
| |
| while (tries-- > 0) { |
| ret = regmap_read(data->regmap, MLX90632_REG_STATUS, |
| ®_status); |
| if (ret < 0) |
| return ret; |
| if (reg_status & MLX90632_STAT_DATA_RDY) |
| break; |
| usleep_range(10000, 11000); |
| } |
| |
| if (tries < 0) { |
| dev_err(&data->client->dev, "data not ready"); |
| return -ETIMEDOUT; |
| } |
| |
| return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2; |
| } |
| |
| 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 -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int mlx90632_read_ambient_raw(struct regmap *regmap, |
| s16 *ambient_new_raw, s16 *ambient_old_raw) |
| { |
| int ret; |
| unsigned int read_tmp; |
| |
| 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) |
| { |
| int ret; |
| unsigned int read_tmp; |
| s16 read; |
| u8 channel = 0; |
| u8 channel_old = 0; |
| |
| 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 ret, measurement; |
| |
| mutex_lock(&data->lock); |
| measurement = mlx90632_perform_measurement(data); |
| if (measurement < 0) { |
| ret = measurement; |
| goto read_unlock; |
| } |
| 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_ee_register(struct regmap *regmap, u16 reg_lsb, |
| s32 *reg_value) |
| { |
| s32 ret; |
| unsigned int read; |
| u32 value; |
| |
| 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 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, s32 Fa, s32 Fb, |
| s32 Ga, s16 Ha, s16 Hb, |
| u16 emissivity) |
| { |
| s64 calcedKsTO, calcedKsTA, ir_Alpha, TAdut4, 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); |
| TAdut4 = (div64_s64(TAdut, 10000LL) + 27315) * |
| (div64_s64(TAdut, 10000LL) + 27315) * |
| (div64_s64(TAdut, 10000LL) + 27315) * |
| (div64_s64(TAdut, 10000LL) + 27315); |
| |
| return (int_sqrt64(int_sqrt64(ir_Alpha * 1000000000000LL + TAdut4)) |
| - 27315 - Hb_customer) * 10; |
| } |
| |
| 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; |
| s64 temp = 25000; |
| s8 i; |
| |
| kTA = (Ea * 1000LL) >> 16LL; |
| kTA0 = (Eb * 1000LL) >> 8LL; |
| TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 25 * 1000000LL; |
| |
| /* Iterations of calculation as described in datasheet */ |
| for (i = 0; i < 5; ++i) { |
| temp = mlx90632_calc_temp_object_iteration(temp, object, TAdut, |
| Fa, Fb, Ga, Ha, Hb, |
| tmp_emi); |
| } |
| return temp; |
| } |
| |
| static int mlx90632_calc_object_dsp105(struct mlx90632_data *data, int *val) |
| { |
| s32 ret; |
| s32 Ea, Eb, Fa, Fb, Ga; |
| unsigned int read_tmp; |
| s16 Ha, Hb, Gb, Ka; |
| s16 ambient_new_raw, ambient_old_raw, object_new_raw, object_old_raw; |
| s64 object, ambient; |
| |
| 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; |
| |
| 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) |
| { |
| s32 ret; |
| unsigned int read_tmp; |
| s32 PT, PR, PG, PO; |
| s16 Gb; |
| s16 ambient_new_raw, ambient_old_raw; |
| |
| 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_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; |
| |
| 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) |
| return ret; |
| return IIO_VAL_INT; |
| case IIO_MOD_TEMP_OBJECT: |
| ret = mlx90632_calc_object_dsp105(data, val); |
| if (ret < 0) |
| return ret; |
| return IIO_VAL_INT; |
| default: |
| return -EINVAL; |
| } |
| case IIO_CHAN_INFO_CALIBEMISSIVITY: |
| if (data->emissivity == 1000) { |
| *val = 1; |
| *val2 = 0; |
| } else { |
| *val = 0; |
| *val2 = data->emissivity * 1000; |
| } |
| return IIO_VAL_INT_PLUS_MICRO; |
| |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| 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; |
| 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), |
| }, |
| { |
| .type = IIO_TEMP, |
| .modified = 1, |
| .channel2 = IIO_MOD_TEMP_OBJECT, |
| .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | |
| BIT(IIO_CHAN_INFO_CALIBEMISSIVITY), |
| }, |
| }; |
| |
| static const struct iio_info mlx90632_info = { |
| .read_raw = mlx90632_read_raw, |
| .write_raw = mlx90632_write_raw, |
| }; |
| |
| static int mlx90632_sleep(struct mlx90632_data *data) |
| { |
| regcache_mark_dirty(data->regmap); |
| |
| dev_dbg(&data->client->dev, "Requesting sleep"); |
| 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 int mlx90632_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct iio_dev *indio_dev; |
| struct mlx90632_data *mlx90632; |
| struct regmap *regmap; |
| int ret; |
| unsigned int read; |
| |
| 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; |
| |
| 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); |
| |
| ret = mlx90632_wakeup(mlx90632); |
| if (ret < 0) { |
| dev_err(&client->dev, "Wakeup failed: %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; |
| } |
| 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_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; |
| |
| pm_runtime_disable(&client->dev); |
| ret = pm_runtime_set_active(&client->dev); |
| if (ret < 0) { |
| mlx90632_sleep(mlx90632); |
| return ret; |
| } |
| pm_runtime_enable(&client->dev); |
| pm_runtime_set_autosuspend_delay(&client->dev, MLX90632_SLEEP_DELAY_MS); |
| pm_runtime_use_autosuspend(&client->dev); |
| |
| return iio_device_register(indio_dev); |
| } |
| |
| static int mlx90632_remove(struct i2c_client *client) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| struct mlx90632_data *data = iio_priv(indio_dev); |
| |
| iio_device_unregister(indio_dev); |
| |
| pm_runtime_disable(&client->dev); |
| pm_runtime_set_suspended(&client->dev); |
| pm_runtime_put_noidle(&client->dev); |
| |
| mlx90632_sleep(data); |
| |
| return 0; |
| } |
| |
| 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 __maybe_unused mlx90632_pm_suspend(struct device *dev) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
| struct mlx90632_data *data = iio_priv(indio_dev); |
| |
| return mlx90632_sleep(data); |
| } |
| |
| static int __maybe_unused mlx90632_pm_resume(struct device *dev) |
| { |
| struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
| struct mlx90632_data *data = iio_priv(indio_dev); |
| |
| return mlx90632_wakeup(data); |
| } |
| |
| static UNIVERSAL_DEV_PM_OPS(mlx90632_pm_ops, mlx90632_pm_suspend, |
| mlx90632_pm_resume, NULL); |
| |
| static struct i2c_driver mlx90632_driver = { |
| .driver = { |
| .name = "mlx90632", |
| .of_match_table = mlx90632_of_match, |
| .pm = &mlx90632_pm_ops, |
| }, |
| .probe = mlx90632_probe, |
| .remove = mlx90632_remove, |
| .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"); |