diff options
Diffstat (limited to 'drivers/iio/temperature/mlx90635.c')
| -rw-r--r-- | drivers/iio/temperature/mlx90635.c | 1097 |
1 files changed, 1097 insertions, 0 deletions
diff --git a/drivers/iio/temperature/mlx90635.c b/drivers/iio/temperature/mlx90635.c new file mode 100644 index 000000000000..1f5c962c1818 --- /dev/null +++ b/drivers/iio/temperature/mlx90635.c @@ -0,0 +1,1097 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * mlx90635.c - Melexis MLX90635 contactless IR temperature sensor + * + * Copyright (c) 2023 Melexis <cmo@melexis.com> + * + * Driver for the Melexis MLX90635 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> + +/* Memory sections addresses */ +#define MLX90635_ADDR_RAM 0x0000 /* Start address of ram */ +#define MLX90635_ADDR_EEPROM 0x0018 /* Start address of user eeprom */ + +/* EEPROM addresses - used at startup */ +#define MLX90635_EE_I2C_CFG 0x0018 /* I2C address register initial value */ +#define MLX90635_EE_CTRL1 0x001A /* Control register1 initial value */ +#define MLX90635_EE_CTRL2 0x001C /* Control register2 initial value */ + +#define MLX90635_EE_Ha 0x001E /* Ha customer calib value reg 16bit */ +#define MLX90635_EE_Hb 0x0020 /* Hb customer calib value reg 16bit */ +#define MLX90635_EE_Fa 0x0026 /* Fa calibration register 32bit */ +#define MLX90635_EE_FASCALE 0x002A /* Scaling coefficient for Fa register 16bit */ +#define MLX90635_EE_Ga 0x002C /* Ga calibration register 16bit */ +#define MLX90635_EE_Fb 0x002E /* Fb calibration register 16bit */ +#define MLX90635_EE_Ea 0x0030 /* Ea calibration register 32bit */ +#define MLX90635_EE_Eb 0x0034 /* Eb calibration register 32bit */ +#define MLX90635_EE_P_G 0x0038 /* P_G calibration register 16bit */ +#define MLX90635_EE_P_O 0x003A /* P_O calibration register 16bit */ +#define MLX90635_EE_Aa 0x003C /* Aa calibration register 16bit */ +#define MLX90635_EE_VERSION 0x003E /* Version bits 4:7 and 12:15 */ +#define MLX90635_EE_Gb 0x0040 /* Gb calibration register 16bit */ + +/* Device status register - volatile */ +#define MLX90635_REG_STATUS 0x0000 +#define MLX90635_STAT_BUSY BIT(6) /* Device busy indicator */ +#define MLX90635_STAT_BRST BIT(5) /* Brown out reset indicator */ +#define MLX90635_STAT_CYCLE_POS GENMASK(4, 2) /* Data position */ +#define MLX90635_STAT_END_CONV BIT(1) /* End of conversion indicator */ +#define MLX90635_STAT_DATA_RDY BIT(0) /* Data ready indicator */ + +/* EEPROM control register address - volatile */ +#define MLX90635_REG_EE 0x000C +#define MLX90635_EE_ACTIVE BIT(4) /* Power-on EEPROM */ +#define MLX90635_EE_BUSY_MASK BIT(15) + +#define MLX90635_REG_CMD 0x0010 /* Command register address */ + +/* Control register1 address - volatile */ +#define MLX90635_REG_CTRL1 0x0014 +#define MLX90635_CTRL1_REFRESH_RATE_MASK GENMASK(2, 0) +#define MLX90635_CTRL1_RES_CTRL_MASK GENMASK(4, 3) +#define MLX90635_CTRL1_TABLE_MASK BIT(15) /* Table select */ + +/* Control register2 address - volatile */ +#define MLX90635_REG_CTRL2 0x0016 +#define MLX90635_CTRL2_BURST_CNT_MASK GENMASK(10, 6) /* Burst count */ +#define MLX90635_CTRL2_MODE_MASK GENMASK(12, 11) /* Power mode */ +#define MLX90635_CTRL2_SOB_MASK BIT(15) + +/* PowerModes statuses */ +#define MLX90635_PWR_STATUS_HALT 0 +#define MLX90635_PWR_STATUS_SLEEP_STEP 1 +#define MLX90635_PWR_STATUS_STEP 2 +#define MLX90635_PWR_STATUS_CONTINUOUS 3 + +/* Measurement data addresses */ +#define MLX90635_RESULT_1 0x0002 +#define MLX90635_RESULT_2 0x0004 +#define MLX90635_RESULT_3 0x0006 +#define MLX90635_RESULT_4 0x0008 +#define MLX90635_RESULT_5 0x000A + +/* Timings (ms) */ +#define MLX90635_TIMING_RST_MIN 200 /* Minimum time after addressed reset command */ +#define MLX90635_TIMING_RST_MAX 250 /* Maximum time after addressed reset command */ +#define MLX90635_TIMING_POLLING 10000 /* Time between bit polling*/ +#define MLX90635_TIMING_EE_ACTIVE_MIN 100 /* Minimum time after activating the EEPROM for read */ +#define MLX90635_TIMING_EE_ACTIVE_MAX 150 /* Maximum time after activating the EEPROM for read */ + +/* Magic constants */ +#define MLX90635_ID_DSPv1 0x01 /* EEPROM DSP version */ +#define MLX90635_RESET_CMD 0x0006 /* Reset sensor (address or global) */ +#define MLX90635_MAX_MEAS_NUM 31 /* Maximum number of measurements in list */ +#define MLX90635_PTAT_DIV 12 /* Used to divide the PTAT value in pre-processing */ +#define MLX90635_IR_DIV 24 /* Used to divide the IR value in pre-processing */ +#define MLX90635_SLEEP_DELAY_MS 6000 /* Autosleep delay */ +#define MLX90635_MEAS_MAX_TIME 2000 /* Max measurement time in ms for the lowest refresh rate */ +#define MLX90635_READ_RETRIES 100 /* Number of read retries before quitting with timeout error */ +#define MLX90635_VERSION_MASK (GENMASK(15, 12) | GENMASK(7, 4)) +#define MLX90635_DSP_VERSION(reg) (((reg & GENMASK(14, 12)) >> 9) | ((reg & GENMASK(6, 4)) >> 4)) +#define MLX90635_DSP_FIXED BIT(15) + + +/** + * struct mlx90635_data - private data for the MLX90635 device + * @client: I2C client of the device + * @lock: Internal mutex because multiple reads are needed for single triggered + * measurement to ensure data consistency + * @regmap: Regmap of the device registers + * @regmap_ee: Regmap of the device EEPROM which can be cached + * @emissivity: Object emissivity from 0 to 1000 where 1000 = 1 + * @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 mlx90635_data { + struct i2c_client *client; + struct mutex lock; + struct regmap *regmap; + struct regmap *regmap_ee; + u16 emissivity; + struct regulator *regulator; + int powerstatus; + unsigned long interaction_ts; +}; + +static const struct regmap_range mlx90635_volatile_reg_range[] = { + regmap_reg_range(MLX90635_REG_STATUS, MLX90635_REG_STATUS), + regmap_reg_range(MLX90635_RESULT_1, MLX90635_RESULT_5), + regmap_reg_range(MLX90635_REG_EE, MLX90635_REG_EE), + regmap_reg_range(MLX90635_REG_CMD, MLX90635_REG_CMD), + regmap_reg_range(MLX90635_REG_CTRL1, MLX90635_REG_CTRL2), +}; + +static const struct regmap_access_table mlx90635_volatile_regs_tbl = { + .yes_ranges = mlx90635_volatile_reg_range, + .n_yes_ranges = ARRAY_SIZE(mlx90635_volatile_reg_range), +}; + +static const struct regmap_range mlx90635_read_reg_range[] = { + regmap_reg_range(MLX90635_REG_STATUS, MLX90635_REG_STATUS), + regmap_reg_range(MLX90635_RESULT_1, MLX90635_RESULT_5), + regmap_reg_range(MLX90635_REG_EE, MLX90635_REG_EE), + regmap_reg_range(MLX90635_REG_CMD, MLX90635_REG_CMD), + regmap_reg_range(MLX90635_REG_CTRL1, MLX90635_REG_CTRL2), +}; + +static const struct regmap_access_table mlx90635_readable_regs_tbl = { + .yes_ranges = mlx90635_read_reg_range, + .n_yes_ranges = ARRAY_SIZE(mlx90635_read_reg_range), +}; + +static const struct regmap_range mlx90635_no_write_reg_range[] = { + regmap_reg_range(MLX90635_RESULT_1, MLX90635_RESULT_5), +}; + +static const struct regmap_access_table mlx90635_writeable_regs_tbl = { + .no_ranges = mlx90635_no_write_reg_range, + .n_no_ranges = ARRAY_SIZE(mlx90635_no_write_reg_range), +}; + +static const struct regmap_config mlx90635_regmap = { + .name = "mlx90635-registers", + .reg_stride = 1, + .reg_bits = 16, + .val_bits = 16, + + .volatile_table = &mlx90635_volatile_regs_tbl, + .rd_table = &mlx90635_readable_regs_tbl, + .wr_table = &mlx90635_writeable_regs_tbl, + + .use_single_read = true, + .use_single_write = true, + .can_multi_write = false, + .reg_format_endian = REGMAP_ENDIAN_BIG, + .val_format_endian = REGMAP_ENDIAN_BIG, + .cache_type = REGCACHE_RBTREE, +}; + +static const struct regmap_range mlx90635_read_ee_range[] = { + regmap_reg_range(MLX90635_EE_I2C_CFG, MLX90635_EE_CTRL2), + regmap_reg_range(MLX90635_EE_Ha, MLX90635_EE_Gb), +}; + +static const struct regmap_access_table mlx90635_readable_ees_tbl = { + .yes_ranges = mlx90635_read_ee_range, + .n_yes_ranges = ARRAY_SIZE(mlx90635_read_ee_range), +}; + +static const struct regmap_range mlx90635_no_write_ee_range[] = { + regmap_reg_range(MLX90635_ADDR_EEPROM, MLX90635_EE_Gb), +}; + +static const struct regmap_access_table mlx90635_writeable_ees_tbl = { + .no_ranges = mlx90635_no_write_ee_range, + .n_no_ranges = ARRAY_SIZE(mlx90635_no_write_ee_range), +}; + +static const struct regmap_config mlx90635_regmap_ee = { + .name = "mlx90635-eeprom", + .reg_stride = 1, + .reg_bits = 16, + .val_bits = 16, + + .volatile_table = NULL, + .rd_table = &mlx90635_readable_ees_tbl, + .wr_table = &mlx90635_writeable_ees_tbl, + + .use_single_read = true, + .use_single_write = true, + .can_multi_write = false, + .reg_format_endian = REGMAP_ENDIAN_BIG, + .val_format_endian = REGMAP_ENDIAN_BIG, + .cache_type = REGCACHE_RBTREE, +}; + +/** + * mlx90635_reset_delay() - Give the mlx90635 some time to reset properly + * If this is not done, the following I2C command(s) will not be accepted. + */ +static void mlx90635_reset_delay(void) +{ + usleep_range(MLX90635_TIMING_RST_MIN, MLX90635_TIMING_RST_MAX); +} + +static int mlx90635_pwr_sleep_step(struct mlx90635_data *data) +{ + int ret; + + if (data->powerstatus == MLX90635_PWR_STATUS_SLEEP_STEP) + return 0; + + ret = regmap_write_bits(data->regmap, MLX90635_REG_CTRL2, MLX90635_CTRL2_MODE_MASK, + FIELD_PREP(MLX90635_CTRL2_MODE_MASK, MLX90635_PWR_STATUS_SLEEP_STEP)); + if (ret < 0) + return ret; + + data->powerstatus = MLX90635_PWR_STATUS_SLEEP_STEP; + return 0; +} + +static int mlx90635_pwr_continuous(struct mlx90635_data *data) +{ + int ret; + + if (data->powerstatus == MLX90635_PWR_STATUS_CONTINUOUS) + return 0; + + ret = regmap_write_bits(data->regmap, MLX90635_REG_CTRL2, MLX90635_CTRL2_MODE_MASK, + FIELD_PREP(MLX90635_CTRL2_MODE_MASK, MLX90635_PWR_STATUS_CONTINUOUS)); + if (ret < 0) + return ret; + + data->powerstatus = MLX90635_PWR_STATUS_CONTINUOUS; + return 0; +} + +static int mlx90635_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 + 2, &read); + if (ret < 0) + return ret; + + value = read; + + ret = regmap_read(regmap, reg_lsb, &read); + if (ret < 0) + return ret; + + *reg_value = (read << 16) | (value & 0xffff); + + return 0; +} + +static int mlx90635_read_ee_ambient(struct regmap *regmap, s16 *PG, s16 *PO, s16 *Gb) +{ + unsigned int read_tmp; + int ret; + + ret = regmap_read(regmap, MLX90635_EE_P_O, &read_tmp); + if (ret < 0) + return ret; + *PO = (s16)read_tmp; + + ret = regmap_read(regmap, MLX90635_EE_P_G, &read_tmp); + if (ret < 0) + return ret; + *PG = (s16)read_tmp; + + ret = regmap_read(regmap, MLX90635_EE_Gb, &read_tmp); + if (ret < 0) + return ret; + *Gb = (u16)read_tmp; + + return 0; +} + +static int mlx90635_read_ee_object(struct regmap *regmap, u32 *Ea, u32 *Eb, u32 *Fa, s16 *Fb, + s16 *Ga, s16 *Gb, s16 *Ha, s16 *Hb, u16 *Fa_scale) +{ + unsigned int read_tmp; + int ret; + + ret = mlx90635_read_ee_register(regmap, MLX90635_EE_Ea, Ea); + if (ret < 0) + return ret; + + ret = mlx90635_read_ee_register(regmap, MLX90635_EE_Eb, Eb); + if (ret < 0) + return ret; + + ret = mlx90635_read_ee_register(regmap, MLX90635_EE_Fa, Fa); + if (ret < 0) + return ret; + + ret = regmap_read(regmap, MLX90635_EE_Ha, &read_tmp); + if (ret < 0) + return ret; + *Ha = (s16)read_tmp; + + ret = regmap_read(regmap, MLX90635_EE_Hb, &read_tmp); + if (ret < 0) + return ret; + *Hb = (s16)read_tmp; + + ret = regmap_read(regmap, MLX90635_EE_Ga, &read_tmp); + if (ret < 0) + return ret; + *Ga = (s16)read_tmp; + + ret = regmap_read(regmap, MLX90635_EE_Gb, &read_tmp); + if (ret < 0) + return ret; + *Gb = (s16)read_tmp; + + ret = regmap_read(regmap, MLX90635_EE_Fb, &read_tmp); + if (ret < 0) + return ret; + *Fb = (s16)read_tmp; + + ret = regmap_read(regmap, MLX90635_EE_FASCALE, &read_tmp); + if (ret < 0) + return ret; + *Fa_scale = (u16)read_tmp; + + return 0; +} + +static int mlx90635_calculate_dataset_ready_time(struct mlx90635_data *data, int *refresh_time) +{ + unsigned int reg; + int ret; + + ret = regmap_read(data->regmap, MLX90635_REG_CTRL1, ®); + if (ret < 0) + return ret; + + *refresh_time = 2 * (MLX90635_MEAS_MAX_TIME >> FIELD_GET(MLX90635_CTRL1_REFRESH_RATE_MASK, reg)) + 80; + + return 0; +} + +static int mlx90635_perform_measurement_burst(struct mlx90635_data *data) +{ + unsigned int reg_status; + int refresh_time; + int ret; + + ret = regmap_write_bits(data->regmap, MLX90635_REG_STATUS, + MLX90635_STAT_END_CONV, MLX90635_STAT_END_CONV); + if (ret < 0) + return ret; + + ret = mlx90635_calculate_dataset_ready_time(data, &refresh_time); + if (ret < 0) + return ret; + + ret = regmap_write_bits(data->regmap, MLX90635_REG_CTRL2, + FIELD_PREP(MLX90635_CTRL2_SOB_MASK, 1), + FIELD_PREP(MLX90635_CTRL2_SOB_MASK, 1)); + if (ret < 0) + return ret; + + msleep(refresh_time); /* Wait minimum time for dataset to be ready */ + + ret = regmap_read_poll_timeout(data->regmap, MLX90635_REG_STATUS, reg_status, + (!(reg_status & MLX90635_STAT_END_CONV)) == 0, + MLX90635_TIMING_POLLING, MLX90635_READ_RETRIES * 10000); + if (ret < 0) { + dev_err(&data->client->dev, "data not ready"); + return -ETIMEDOUT; + } + + return 0; +} + +static int mlx90635_read_ambient_raw(struct regmap *regmap, + s16 *ambient_new_raw, s16 *ambient_old_raw) +{ + unsigned int read_tmp; + int ret; + + ret = regmap_read(regmap, MLX90635_RESULT_2, &read_tmp); + if (ret < 0) + return ret; + *ambient_new_raw = (s16)read_tmp; + + ret = regmap_read(regmap, MLX90635_RESULT_3, &read_tmp); + if (ret < 0) + return ret; + *ambient_old_raw = (s16)read_tmp; + + return 0; +} + +static int mlx90635_read_object_raw(struct regmap *regmap, s16 *object_raw) +{ + unsigned int read_tmp; + s16 read; + int ret; + + ret = regmap_read(regmap, MLX90635_RESULT_1, &read_tmp); + if (ret < 0) + return ret; + + read = (s16)read_tmp; + + ret = regmap_read(regmap, MLX90635_RESULT_4, &read_tmp); + if (ret < 0) + return ret; + *object_raw = (read - (s16)read_tmp) / 2; + + return 0; +} + +static int mlx90635_read_all_channel(struct mlx90635_data *data, + s16 *ambient_new_raw, s16 *ambient_old_raw, + s16 *object_raw) +{ + int ret; + + mutex_lock(&data->lock); + if (data->powerstatus == MLX90635_PWR_STATUS_SLEEP_STEP) { + /* Trigger measurement in Sleep Step mode */ + ret = mlx90635_perform_measurement_burst(data); + if (ret < 0) + goto read_unlock; + } + + ret = mlx90635_read_ambient_raw(data->regmap, ambient_new_raw, + ambient_old_raw); + if (ret < 0) + goto read_unlock; + + ret = mlx90635_read_object_raw(data->regmap, object_raw); +read_unlock: + mutex_unlock(&data->lock); + return ret; +} + +static s64 mlx90635_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), + (MLX90635_PTAT_DIV)); + tmp = div64_s64( + div64_s64(((s64)ambient_new_raw * 1000000000000LL), + (MLX90635_PTAT_DIV)), VR_Ta); + return div64_s64(tmp << 19ULL, 1000LL); +} + +static s64 mlx90635_preprocess_temp_obj(s16 object_raw, + s16 ambient_new_raw, + s16 ambient_old_raw, s16 Gb) +{ + s64 VR_IR, kGb, tmp; + + kGb = ((s64)Gb * 1000LL) >> 10ULL; + VR_IR = (s64)ambient_old_raw * 1000000LL + + kGb * (div64_s64((s64)ambient_new_raw * 1000LL, + MLX90635_PTAT_DIV)); + tmp = div64_s64( + div64_s64((s64)(object_raw * 1000000LL), + MLX90635_IR_DIV) * 1000000LL, + VR_IR); + return div64_s64((tmp << 19ULL), 1000LL); +} + +static s32 mlx90635_calc_temp_ambient(s16 ambient_new_raw, s16 ambient_old_raw, + u16 P_G, u16 P_O, s16 Gb) +{ + s64 kPG, kPO, AMB; + + AMB = mlx90635_preprocess_temp_amb(ambient_new_raw, ambient_old_raw, + Gb); + kPG = ((s64)P_G * 1000000LL) >> 9ULL; + kPO = AMB - (((s64)P_O * 1000LL) >> 1ULL); + + return 30 * 1000LL + div64_s64(kPO * 1000000LL, kPG); +} + +static s32 mlx90635_calc_temp_object_iteration(s32 prev_object_temp, s64 object, + s64 TAdut, s64 TAdut4, s16 Ga, + u32 Fa, u16 Fa_scale, s16 Fb, + s16 Ha, s16 Hb, u16 emissivity) +{ + s64 calcedGa, calcedGb, calcedFa, Alpha_corr; + s64 Ha_customer, Hb_customer; + + Ha_customer = ((s64)Ha * 1000000LL) >> 14ULL; + Hb_customer = ((s64)Hb * 100) >> 10ULL; + + calcedGa = ((s64)((s64)Ga * (prev_object_temp - 35 * 1000LL) + * 1000LL)) >> 24LL; + calcedGb = ((s64)(Fb * (TAdut - 30 * 1000000LL))) >> 24LL; + + Alpha_corr = ((s64)((s64)Fa * Ha_customer * 10000LL) >> Fa_scale); + Alpha_corr *= ((s64)(1 * 1000000LL + calcedGa + calcedGb)); + + Alpha_corr = div64_s64(Alpha_corr, 1000LL); + Alpha_corr *= emissivity; + Alpha_corr = div64_s64(Alpha_corr, 100LL); + calcedFa = div64_s64((s64)object * 100000000000LL, Alpha_corr); + + return (int_sqrt64(int_sqrt64(calcedFa * 100000000LL + TAdut4)) + - 27315 - Hb_customer) * 10; +} + +static s64 mlx90635_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 mlx90635_calc_temp_object(s64 object, s64 ambient, u32 Ea, u32 Eb, + s16 Ga, u32 Fa, u16 Fa_scale, s16 Fb, s16 Ha, s16 Hb, + u16 tmp_emi) +{ + s64 kTA, kTA0, TAdut, TAdut4; + s64 temp = 35000; + s8 i; + + kTA = (Ea * 1000LL) >> 16LL; + kTA0 = (Eb * 1000LL) >> 8LL; + TAdut = div64_s64(((ambient - kTA0) * 1000000LL), kTA) + 30 * 1000000LL; + TAdut4 = mlx90635_calc_ta4(TAdut, 10000LL); + + /* Iterations of calculation as described in datasheet */ + for (i = 0; i < 5; ++i) { + temp = mlx90635_calc_temp_object_iteration(temp, object, TAdut, TAdut4, + Ga, Fa, Fa_scale, Fb, Ha, Hb, + tmp_emi); + } + return temp; +} + +static int mlx90635_calc_object(struct mlx90635_data *data, int *val) +{ + s16 ambient_new_raw, ambient_old_raw, object_raw; + s16 Fb, Ga, Gb, Ha, Hb; + s64 object, ambient; + u32 Ea, Eb, Fa; + u16 Fa_scale; + int ret; + + ret = mlx90635_read_ee_object(data->regmap_ee, &Ea, &Eb, &Fa, &Fb, &Ga, &Gb, &Ha, &Hb, &Fa_scale); + if (ret < 0) + return ret; + + ret = mlx90635_read_all_channel(data, + &ambient_new_raw, &ambient_old_raw, + &object_raw); + if (ret < 0) + return ret; + + ambient = mlx90635_preprocess_temp_amb(ambient_new_raw, + ambient_old_raw, Gb); + object = mlx90635_preprocess_temp_obj(object_raw, + ambient_new_raw, + ambient_old_raw, Gb); + + *val = mlx90635_calc_temp_object(object, ambient, Ea, Eb, Ga, Fa, Fa_scale, Fb, + Ha, Hb, data->emissivity); + return 0; +} + +static int mlx90635_calc_ambient(struct mlx90635_data *data, int *val) +{ + s16 ambient_new_raw, ambient_old_raw; + s16 PG, PO, Gb; + int ret; + + ret = mlx90635_read_ee_ambient(data->regmap_ee, &PG, &PO, &Gb); + if (ret < 0) + return ret; + + mutex_lock(&data->lock); + if (data->powerstatus == MLX90635_PWR_STATUS_SLEEP_STEP) { + ret = mlx90635_perform_measurement_burst(data); + if (ret < 0) + goto read_ambient_unlock; + } + + ret = mlx90635_read_ambient_raw(data->regmap, &ambient_new_raw, + &ambient_old_raw); +read_ambient_unlock: + mutex_unlock(&data->lock); + if (ret < 0) + return ret; + + *val = mlx90635_calc_temp_ambient(ambient_new_raw, ambient_old_raw, + PG, PO, Gb); + return ret; +} + +static int mlx90635_get_refresh_rate(struct mlx90635_data *data, + unsigned int *refresh_rate) +{ + unsigned int reg; + int ret; + + ret = regmap_read(data->regmap, MLX90635_REG_CTRL1, ®); + if (ret < 0) + return ret; + + *refresh_rate = FIELD_GET(MLX90635_CTRL1_REFRESH_RATE_MASK, reg); + + return 0; +} + +static const struct { + int val; + int val2; +} mlx90635_freqs[] = { + { 0, 200000 }, + { 0, 500000 }, + { 0, 900000 }, + { 1, 700000 }, + { 3, 0 }, + { 4, 800000 }, + { 6, 900000 }, + { 8, 900000 } +}; + +/** + * mlx90635_pm_interaction_wakeup() - Measure time between user interactions to change powermode + * @data: pointer to mlx90635_data object containing interaction_ts information + * + * Switch to continuous mode when interaction is faster than MLX90635_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 mlx90635_pm_interaction_wakeup(struct mlx90635_data *data) +{ + unsigned long now; + int ret; + + now = jiffies; + if (time_in_range(now, data->interaction_ts, + data->interaction_ts + + msecs_to_jiffies(MLX90635_MEAS_MAX_TIME + 100))) { + ret = mlx90635_pwr_continuous(data); + if (ret < 0) + return ret; + } + + data->interaction_ts = now; + + return 0; +} + +static int mlx90635_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *channel, int *val, + int *val2, long mask) +{ + struct mlx90635_data *data = iio_priv(indio_dev); + int ret; + int cr; + + pm_runtime_get_sync(&data->client->dev); + ret = mlx90635_pm_interaction_wakeup(data); + if (ret < 0) + goto mlx90635_read_raw_pm; + + switch (mask) { + case IIO_CHAN_INFO_PROCESSED: + switch (channel->channel2) { + case IIO_MOD_TEMP_AMBIENT: + ret = mlx90635_calc_ambient(data, val); + if (ret < 0) + goto mlx90635_read_raw_pm; + + ret = IIO_VAL_INT; + break; + case IIO_MOD_TEMP_OBJECT: + ret = mlx90635_calc_object(data, val); + if (ret < 0) + goto mlx90635_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_SAMP_FREQ: + ret = mlx90635_get_refresh_rate(data, &cr); + if (ret < 0) + goto mlx90635_read_raw_pm; + + *val = mlx90635_freqs[cr].val; + *val2 = mlx90635_freqs[cr].val2; + ret = IIO_VAL_INT_PLUS_MICRO; + break; + default: + ret = -EINVAL; + break; + } + +mlx90635_read_raw_pm: + pm_runtime_mark_last_busy(&data->client->dev); + pm_runtime_put_autosuspend(&data->client->dev); + return ret; +} + +static int mlx90635_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *channel, int val, + int val2, long mask) +{ + struct mlx90635_data *data = iio_priv(indio_dev); + int ret; + int i; + + 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_SAMP_FREQ: + for (i = 0; i < ARRAY_SIZE(mlx90635_freqs); i++) { + if (val == mlx90635_freqs[i].val && + val2 == mlx90635_freqs[i].val2) + break; + } + if (i == ARRAY_SIZE(mlx90635_freqs)) + return -EINVAL; + + ret = regmap_write_bits(data->regmap, MLX90635_REG_CTRL1, + MLX90635_CTRL1_REFRESH_RATE_MASK, i); + + return ret; + default: + return -EINVAL; + } +} + +static int mlx90635_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 *)mlx90635_freqs; + *type = IIO_VAL_INT_PLUS_MICRO; + *length = 2 * ARRAY_SIZE(mlx90635_freqs); + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } +} + +static const struct iio_chan_spec mlx90635_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), + .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 mlx90635_info = { + .read_raw = mlx90635_read_raw, + .write_raw = mlx90635_write_raw, + .read_avail = mlx90635_read_avail, +}; + +static void mlx90635_sleep(void *_data) +{ + struct mlx90635_data *data = _data; + + mlx90635_pwr_sleep_step(data); +} + +static int mlx90635_suspend(struct mlx90635_data *data) +{ + return mlx90635_pwr_sleep_step(data); +} + +static int mlx90635_wakeup(struct mlx90635_data *data) +{ + s16 Fb, Ga, Gb, Ha, Hb, PG, PO; + unsigned int dsp_version; + u32 Ea, Eb, Fa; + u16 Fa_scale; + int ret; + + regcache_cache_bypass(data->regmap_ee, false); + regcache_cache_only(data->regmap_ee, false); + regcache_cache_only(data->regmap, false); + + ret = mlx90635_pwr_continuous(data); + if (ret < 0) { + dev_err(&data->client->dev, "Switch to continuous mode failed\n"); + return ret; + } + ret = regmap_write_bits(data->regmap, MLX90635_REG_EE, + MLX90635_EE_ACTIVE, MLX90635_EE_ACTIVE); + if (ret < 0) { + dev_err(&data->client->dev, "Powering EEPROM failed\n"); + return ret; + } + usleep_range(MLX90635_TIMING_EE_ACTIVE_MIN, MLX90635_TIMING_EE_ACTIVE_MAX); + + regcache_mark_dirty(data->regmap_ee); + + ret = regcache_sync(data->regmap_ee); + if (ret < 0) { + dev_err(&data->client->dev, + "Failed to sync cache: %d\n", ret); + return ret; + } + + ret = mlx90635_read_ee_ambient(data->regmap_ee, &PG, &PO, &Gb); + if (ret < 0) { + dev_err(&data->client->dev, + "Failed to read to cache Ambient coefficients EEPROM region: %d\n", ret); + return ret; + } + + ret = mlx90635_read_ee_object(data->regmap_ee, &Ea, &Eb, &Fa, &Fb, &Ga, &Gb, &Ha, &Hb, &Fa_scale); + if (ret < 0) { + dev_err(&data->client->dev, + "Failed to read to cache Object coefficients EEPROM region: %d\n", ret); + return ret; + } + + ret = regmap_read(data->regmap_ee, MLX90635_EE_VERSION, &dsp_version); + if (ret < 0) { + dev_err(&data->client->dev, + "Failed to read to cache of EEPROM version: %d\n", ret); + return ret; + } + + regcache_cache_only(data->regmap_ee, true); + + return ret; +} + +static void mlx90635_disable_regulator(void *_data) +{ + struct mlx90635_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 mlx90635_enable_regulator(struct mlx90635_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; + } + + mlx90635_reset_delay(); + + return ret; +} + +static int mlx90635_probe(struct i2c_client *client) +{ + struct mlx90635_data *mlx90635; + struct iio_dev *indio_dev; + unsigned int dsp_version; + struct regmap *regmap; + struct regmap *regmap_ee; + int ret; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*mlx90635)); + if (!indio_dev) + return dev_err_probe(&client->dev, -ENOMEM, "failed to allocate device\n"); + + regmap = devm_regmap_init_i2c(client, &mlx90635_regmap); + if (IS_ERR(regmap)) + return dev_err_probe(&client->dev, PTR_ERR(regmap), + "failed to allocate regmap\n"); + + regmap_ee = devm_regmap_init_i2c(client, &mlx90635_regmap_ee); + if (IS_ERR(regmap)) + return dev_err_probe(&client->dev, PTR_ERR(regmap), + "failed to allocate regmap\n"); + + mlx90635 = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + mlx90635->client = client; + mlx90635->regmap = regmap; + mlx90635->regmap_ee = regmap_ee; + mlx90635->powerstatus = MLX90635_PWR_STATUS_SLEEP_STEP; + + mutex_init(&mlx90635->lock); + indio_dev->name = "mlx90635"; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &mlx90635_info; + indio_dev->channels = mlx90635_channels; + indio_dev->num_channels = ARRAY_SIZE(mlx90635_channels); + + mlx90635->regulator = devm_regulator_get(&client->dev, "vdd"); + if (IS_ERR(mlx90635->regulator)) + return dev_err_probe(&client->dev, PTR_ERR(mlx90635->regulator), + "failed to get vdd regulator"); + + ret = mlx90635_enable_regulator(mlx90635); + if (ret < 0) + return ret; + + ret = devm_add_action_or_reset(&client->dev, mlx90635_disable_regulator, + mlx90635); + if (ret < 0) + return dev_err_probe(&client->dev, ret, + "failed to setup regulator cleanup action\n"); + + ret = mlx90635_wakeup(mlx90635); + if (ret < 0) + return dev_err_probe(&client->dev, ret, "wakeup failed\n"); + + ret = devm_add_action_or_reset(&client->dev, mlx90635_sleep, mlx90635); + if (ret < 0) + return dev_err_probe(&client->dev, ret, + "failed to setup low power cleanup\n"); + + ret = regmap_read(mlx90635->regmap_ee, MLX90635_EE_VERSION, &dsp_version); + if (ret < 0) + return dev_err_probe(&client->dev, ret, "read of version failed\n"); + + dsp_version = dsp_version & MLX90635_VERSION_MASK; + + if (FIELD_GET(MLX90635_DSP_FIXED, dsp_version)) { + if (MLX90635_DSP_VERSION(dsp_version) == MLX90635_ID_DSPv1) { + dev_dbg(&client->dev, + "Detected DSP v1 calibration %x\n", dsp_version); + } else { + dev_dbg(&client->dev, + "Detected Unknown EEPROM calibration %lx\n", + MLX90635_DSP_VERSION(dsp_version)); + } + } else { + return dev_err_probe(&client->dev, -EPROTONOSUPPORT, + "Wrong fixed top bit %x (expected 0x8X0X)\n", + dsp_version); + } + + mlx90635->emissivity = 1000; + mlx90635->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 dev_err_probe(&client->dev, ret, + "failed to enable powermanagement\n"); + + pm_runtime_set_autosuspend_delay(&client->dev, MLX90635_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 mlx90635_id[] = { + { "mlx90635" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, mlx90635_id); + +static const struct of_device_id mlx90635_of_match[] = { + { .compatible = "melexis,mlx90635" }, + { } +}; +MODULE_DEVICE_TABLE(of, mlx90635_of_match); + +static int mlx90635_pm_suspend(struct device *dev) +{ + struct mlx90635_data *data = iio_priv(dev_get_drvdata(dev)); + int ret; + + ret = mlx90635_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 mlx90635_pm_resume(struct device *dev) +{ + struct mlx90635_data *data = iio_priv(dev_get_drvdata(dev)); + int ret; + + ret = mlx90635_enable_regulator(data); + if (ret < 0) + return ret; + + return mlx90635_wakeup(data); +} + +static int mlx90635_pm_runtime_suspend(struct device *dev) +{ + struct mlx90635_data *data = iio_priv(dev_get_drvdata(dev)); + + return mlx90635_pwr_sleep_step(data); +} + +static const struct dev_pm_ops mlx90635_pm_ops = { + SYSTEM_SLEEP_PM_OPS(mlx90635_pm_suspend, mlx90635_pm_resume) + RUNTIME_PM_OPS(mlx90635_pm_runtime_suspend, NULL, NULL) +}; + +static struct i2c_driver mlx90635_driver = { + .driver = { + .name = "mlx90635", + .of_match_table = mlx90635_of_match, + .pm = pm_ptr(&mlx90635_pm_ops), + }, + .probe = mlx90635_probe, + .id_table = mlx90635_id, +}; +module_i2c_driver(mlx90635_driver); + +MODULE_AUTHOR("Crt Mori <cmo@melexis.com>"); +MODULE_DESCRIPTION("Melexis MLX90635 contactless Infra Red temperature sensor driver"); +MODULE_LICENSE("GPL"); |