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988 lines
29 KiB
988 lines
29 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* mlx90632.c - Melexis MLX90632 contactless IR temperature sensor |
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* |
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* Copyright (c) 2017 Melexis <[email protected]> |
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* |
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* Driver for the Melexis MLX90632 I2C 16-bit IR thermopile sensor |
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*/ |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/i2c.h> |
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#include <linux/iopoll.h> |
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#include <linux/kernel.h> |
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#include <linux/limits.h> |
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#include <linux/module.h> |
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#include <linux/math64.h> |
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#include <linux/of.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/regmap.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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/* Memory sections addresses */ |
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#define MLX90632_ADDR_RAM 0x4000 /* Start address of ram */ |
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#define MLX90632_ADDR_EEPROM 0x2480 /* Start address of user eeprom */ |
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|
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/* EEPROM addresses - used at startup */ |
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#define MLX90632_EE_CTRL 0x24d4 /* Control register initial value */ |
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#define MLX90632_EE_I2C_ADDR 0x24d5 /* I2C address register initial value */ |
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#define MLX90632_EE_VERSION 0x240b /* EEPROM version reg address */ |
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#define MLX90632_EE_P_R 0x240c /* P_R calibration register 32bit */ |
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#define MLX90632_EE_P_G 0x240e /* P_G calibration register 32bit */ |
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#define MLX90632_EE_P_T 0x2410 /* P_T calibration register 32bit */ |
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#define MLX90632_EE_P_O 0x2412 /* P_O calibration register 32bit */ |
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#define MLX90632_EE_Aa 0x2414 /* Aa calibration register 32bit */ |
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#define MLX90632_EE_Ab 0x2416 /* Ab calibration register 32bit */ |
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#define MLX90632_EE_Ba 0x2418 /* Ba calibration register 32bit */ |
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#define MLX90632_EE_Bb 0x241a /* Bb calibration register 32bit */ |
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#define MLX90632_EE_Ca 0x241c /* Ca calibration register 32bit */ |
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#define MLX90632_EE_Cb 0x241e /* Cb calibration register 32bit */ |
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#define MLX90632_EE_Da 0x2420 /* Da calibration register 32bit */ |
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#define MLX90632_EE_Db 0x2422 /* Db calibration register 32bit */ |
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#define MLX90632_EE_Ea 0x2424 /* Ea calibration register 32bit */ |
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#define MLX90632_EE_Eb 0x2426 /* Eb calibration register 32bit */ |
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#define MLX90632_EE_Fa 0x2428 /* Fa calibration register 32bit */ |
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#define MLX90632_EE_Fb 0x242a /* Fb calibration register 32bit */ |
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#define MLX90632_EE_Ga 0x242c /* Ga calibration register 32bit */ |
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#define MLX90632_EE_Gb 0x242e /* Gb calibration register 16bit */ |
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#define MLX90632_EE_Ka 0x242f /* Ka calibration register 16bit */ |
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#define MLX90632_EE_Ha 0x2481 /* Ha customer calib value reg 16bit */ |
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#define MLX90632_EE_Hb 0x2482 /* Hb customer calib value reg 16bit */ |
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/* Register addresses - volatile */ |
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#define MLX90632_REG_I2C_ADDR 0x3000 /* Chip I2C address register */ |
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/* Control register address - volatile */ |
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#define MLX90632_REG_CONTROL 0x3001 /* Control Register address */ |
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#define MLX90632_CFG_PWR_MASK GENMASK(2, 1) /* PowerMode Mask */ |
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#define MLX90632_CFG_MTYP_MASK GENMASK(8, 4) /* Meas select Mask */ |
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/* PowerModes statuses */ |
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#define MLX90632_PWR_STATUS(ctrl_val) (ctrl_val << 1) |
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#define MLX90632_PWR_STATUS_HALT MLX90632_PWR_STATUS(0) /* hold */ |
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#define MLX90632_PWR_STATUS_SLEEP_STEP MLX90632_PWR_STATUS(1) /* sleep step*/ |
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#define MLX90632_PWR_STATUS_STEP MLX90632_PWR_STATUS(2) /* step */ |
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#define MLX90632_PWR_STATUS_CONTINUOUS MLX90632_PWR_STATUS(3) /* continuous*/ |
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/* Measurement types */ |
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#define MLX90632_MTYP_MEDICAL 0 |
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#define MLX90632_MTYP_EXTENDED 17 |
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/* Measurement type select*/ |
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#define MLX90632_MTYP_STATUS(ctrl_val) (ctrl_val << 4) |
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#define MLX90632_MTYP_STATUS_MEDICAL MLX90632_MTYP_STATUS(MLX90632_MTYP_MEDICAL) |
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#define MLX90632_MTYP_STATUS_EXTENDED MLX90632_MTYP_STATUS(MLX90632_MTYP_EXTENDED) |
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/* I2C command register - volatile */ |
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#define MLX90632_REG_I2C_CMD 0x3005 /* I2C command Register address */ |
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/* Device status register - volatile */ |
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#define MLX90632_REG_STATUS 0x3fff /* Device status register */ |
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#define MLX90632_STAT_BUSY BIT(10) /* Device busy indicator */ |
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#define MLX90632_STAT_EE_BUSY BIT(9) /* EEPROM busy indicator */ |
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#define MLX90632_STAT_BRST BIT(8) /* Brown out reset indicator */ |
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#define MLX90632_STAT_CYCLE_POS GENMASK(6, 2) /* Data position */ |
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#define MLX90632_STAT_DATA_RDY BIT(0) /* Data ready indicator */ |
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/* RAM_MEAS address-es for each channel */ |
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#define MLX90632_RAM_1(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num) |
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#define MLX90632_RAM_2(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 1) |
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#define MLX90632_RAM_3(meas_num) (MLX90632_ADDR_RAM + 3 * meas_num + 2) |
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/* Name important RAM_MEAS channels */ |
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#define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1 MLX90632_RAM_3(17) |
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#define MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2 MLX90632_RAM_3(18) |
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#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_1 MLX90632_RAM_1(17) |
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#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_2 MLX90632_RAM_2(17) |
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#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_3 MLX90632_RAM_1(18) |
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#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_4 MLX90632_RAM_2(18) |
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#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_5 MLX90632_RAM_1(19) |
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#define MLX90632_RAM_DSP5_EXTENDED_OBJECT_6 MLX90632_RAM_2(19) |
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/* Magic constants */ |
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#define MLX90632_ID_MEDICAL 0x0105 /* EEPROM DSPv5 Medical device id */ |
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#define MLX90632_ID_CONSUMER 0x0205 /* EEPROM DSPv5 Consumer device id */ |
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#define MLX90632_ID_EXTENDED 0x0505 /* EEPROM DSPv5 Extended range device id */ |
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#define MLX90632_ID_MASK GENMASK(14, 0) /* DSP version and device ID in EE_VERSION */ |
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#define MLX90632_DSP_VERSION 5 /* DSP version */ |
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#define MLX90632_DSP_MASK GENMASK(7, 0) /* DSP version in EE_VERSION */ |
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#define MLX90632_RESET_CMD 0x0006 /* Reset sensor (address or global) */ |
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#define MLX90632_REF_12 12LL /* ResCtrlRef value of Ch 1 or Ch 2 */ |
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#define MLX90632_REF_3 12LL /* ResCtrlRef value of Channel 3 */ |
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#define MLX90632_MAX_MEAS_NUM 31 /* Maximum measurements in list */ |
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#define MLX90632_SLEEP_DELAY_MS 3000 /* Autosleep delay */ |
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#define MLX90632_EXTENDED_LIMIT 27000 /* Extended mode raw value limit */ |
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/** |
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* struct mlx90632_data - private data for the MLX90632 device |
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* @client: I2C client of the device |
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* @lock: Internal mutex for multiple reads for single measurement |
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* @regmap: Regmap of the device |
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* @emissivity: Object emissivity from 0 to 1000 where 1000 = 1. |
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* @mtyp: Measurement type physical sensor configuration for extended range |
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* calculations |
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* @object_ambient_temperature: Ambient temperature at object (might differ of |
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* the ambient temperature of sensor. |
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*/ |
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struct mlx90632_data { |
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struct i2c_client *client; |
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struct mutex lock; |
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struct regmap *regmap; |
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u16 emissivity; |
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u8 mtyp; |
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u32 object_ambient_temperature; |
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}; |
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static const struct regmap_range mlx90632_volatile_reg_range[] = { |
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regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL), |
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regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD), |
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regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS), |
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regmap_reg_range(MLX90632_RAM_1(0), |
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MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)), |
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}; |
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static const struct regmap_access_table mlx90632_volatile_regs_tbl = { |
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.yes_ranges = mlx90632_volatile_reg_range, |
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.n_yes_ranges = ARRAY_SIZE(mlx90632_volatile_reg_range), |
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}; |
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static const struct regmap_range mlx90632_read_reg_range[] = { |
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regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka), |
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regmap_reg_range(MLX90632_EE_CTRL, MLX90632_EE_I2C_ADDR), |
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regmap_reg_range(MLX90632_EE_Ha, MLX90632_EE_Hb), |
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regmap_reg_range(MLX90632_REG_I2C_ADDR, MLX90632_REG_CONTROL), |
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regmap_reg_range(MLX90632_REG_I2C_CMD, MLX90632_REG_I2C_CMD), |
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regmap_reg_range(MLX90632_REG_STATUS, MLX90632_REG_STATUS), |
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regmap_reg_range(MLX90632_RAM_1(0), |
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MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)), |
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}; |
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static const struct regmap_access_table mlx90632_readable_regs_tbl = { |
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.yes_ranges = mlx90632_read_reg_range, |
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.n_yes_ranges = ARRAY_SIZE(mlx90632_read_reg_range), |
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}; |
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static const struct regmap_range mlx90632_no_write_reg_range[] = { |
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regmap_reg_range(MLX90632_EE_VERSION, MLX90632_EE_Ka), |
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regmap_reg_range(MLX90632_RAM_1(0), |
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MLX90632_RAM_3(MLX90632_MAX_MEAS_NUM)), |
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}; |
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static const struct regmap_access_table mlx90632_writeable_regs_tbl = { |
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.no_ranges = mlx90632_no_write_reg_range, |
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.n_no_ranges = ARRAY_SIZE(mlx90632_no_write_reg_range), |
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}; |
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static const struct regmap_config mlx90632_regmap = { |
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.reg_bits = 16, |
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.val_bits = 16, |
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.volatile_table = &mlx90632_volatile_regs_tbl, |
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.rd_table = &mlx90632_readable_regs_tbl, |
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.wr_table = &mlx90632_writeable_regs_tbl, |
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.use_single_read = true, |
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.use_single_write = true, |
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.reg_format_endian = REGMAP_ENDIAN_BIG, |
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.val_format_endian = REGMAP_ENDIAN_BIG, |
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.cache_type = REGCACHE_RBTREE, |
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}; |
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static s32 mlx90632_pwr_set_sleep_step(struct regmap *regmap) |
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{ |
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return regmap_update_bits(regmap, MLX90632_REG_CONTROL, |
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MLX90632_CFG_PWR_MASK, |
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MLX90632_PWR_STATUS_SLEEP_STEP); |
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} |
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static s32 mlx90632_pwr_continuous(struct regmap *regmap) |
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{ |
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return regmap_update_bits(regmap, MLX90632_REG_CONTROL, |
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MLX90632_CFG_PWR_MASK, |
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MLX90632_PWR_STATUS_CONTINUOUS); |
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} |
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/** |
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* mlx90632_perform_measurement() - Trigger and retrieve current measurement cycle |
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* @data: pointer to mlx90632_data object containing regmap information |
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* |
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* Perform a measurement and return latest measurement cycle position reported |
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* by sensor. This is a blocking function for 500ms, as that is default sensor |
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* refresh rate. |
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*/ |
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static int mlx90632_perform_measurement(struct mlx90632_data *data) |
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{ |
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unsigned int reg_status; |
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int ret; |
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ret = regmap_update_bits(data->regmap, MLX90632_REG_STATUS, |
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MLX90632_STAT_DATA_RDY, 0); |
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if (ret < 0) |
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return ret; |
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ret = regmap_read_poll_timeout(data->regmap, MLX90632_REG_STATUS, reg_status, |
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!(reg_status & MLX90632_STAT_DATA_RDY), 10000, |
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100 * 10000); |
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if (ret < 0) { |
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dev_err(&data->client->dev, "data not ready"); |
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return -ETIMEDOUT; |
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} |
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return (reg_status & MLX90632_STAT_CYCLE_POS) >> 2; |
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} |
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static int mlx90632_set_meas_type(struct regmap *regmap, u8 type) |
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{ |
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int ret; |
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if ((type != MLX90632_MTYP_MEDICAL) && (type != MLX90632_MTYP_EXTENDED)) |
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return -EINVAL; |
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ret = regmap_write(regmap, MLX90632_REG_I2C_CMD, MLX90632_RESET_CMD); |
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if (ret < 0) |
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return ret; |
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/* |
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* Give the mlx90632 some time to reset properly before sending a new I2C command |
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* if this is not done, the following I2C command(s) will not be accepted. |
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*/ |
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usleep_range(150, 200); |
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ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL, |
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(MLX90632_CFG_MTYP_MASK | MLX90632_CFG_PWR_MASK), |
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(MLX90632_MTYP_STATUS(type) | MLX90632_PWR_STATUS_HALT)); |
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if (ret < 0) |
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return ret; |
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return mlx90632_pwr_continuous(regmap); |
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} |
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static int mlx90632_channel_new_select(int perform_ret, uint8_t *channel_new, |
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uint8_t *channel_old) |
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{ |
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switch (perform_ret) { |
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case 1: |
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*channel_new = 1; |
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*channel_old = 2; |
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break; |
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case 2: |
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*channel_new = 2; |
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*channel_old = 1; |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static int mlx90632_read_ambient_raw(struct regmap *regmap, |
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s16 *ambient_new_raw, s16 *ambient_old_raw) |
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{ |
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int ret; |
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unsigned int read_tmp; |
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ret = regmap_read(regmap, MLX90632_RAM_3(1), &read_tmp); |
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if (ret < 0) |
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return ret; |
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*ambient_new_raw = (s16)read_tmp; |
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ret = regmap_read(regmap, MLX90632_RAM_3(2), &read_tmp); |
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if (ret < 0) |
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return ret; |
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*ambient_old_raw = (s16)read_tmp; |
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return ret; |
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} |
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static int mlx90632_read_object_raw(struct regmap *regmap, |
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int perform_measurement_ret, |
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s16 *object_new_raw, s16 *object_old_raw) |
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{ |
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int ret; |
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unsigned int read_tmp; |
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s16 read; |
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u8 channel = 0; |
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u8 channel_old = 0; |
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ret = mlx90632_channel_new_select(perform_measurement_ret, &channel, |
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&channel_old); |
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if (ret != 0) |
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return ret; |
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ret = regmap_read(regmap, MLX90632_RAM_2(channel), &read_tmp); |
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if (ret < 0) |
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return ret; |
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read = (s16)read_tmp; |
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ret = regmap_read(regmap, MLX90632_RAM_1(channel), &read_tmp); |
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if (ret < 0) |
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return ret; |
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*object_new_raw = (read + (s16)read_tmp) / 2; |
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ret = regmap_read(regmap, MLX90632_RAM_2(channel_old), &read_tmp); |
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if (ret < 0) |
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return ret; |
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read = (s16)read_tmp; |
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ret = regmap_read(regmap, MLX90632_RAM_1(channel_old), &read_tmp); |
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if (ret < 0) |
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return ret; |
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*object_old_raw = (read + (s16)read_tmp) / 2; |
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return ret; |
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} |
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static int mlx90632_read_all_channel(struct mlx90632_data *data, |
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s16 *ambient_new_raw, s16 *ambient_old_raw, |
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s16 *object_new_raw, s16 *object_old_raw) |
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{ |
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s32 ret, measurement; |
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mutex_lock(&data->lock); |
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measurement = mlx90632_perform_measurement(data); |
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if (measurement < 0) { |
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ret = measurement; |
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goto read_unlock; |
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} |
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ret = mlx90632_read_ambient_raw(data->regmap, ambient_new_raw, |
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ambient_old_raw); |
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if (ret < 0) |
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goto read_unlock; |
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ret = mlx90632_read_object_raw(data->regmap, measurement, |
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object_new_raw, object_old_raw); |
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read_unlock: |
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mutex_unlock(&data->lock); |
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return ret; |
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} |
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static int mlx90632_read_ambient_raw_extended(struct regmap *regmap, |
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s16 *ambient_new_raw, s16 *ambient_old_raw) |
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{ |
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unsigned int read_tmp; |
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int ret; |
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ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_1, &read_tmp); |
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if (ret < 0) |
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return ret; |
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*ambient_new_raw = (s16)read_tmp; |
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ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_AMBIENT_2, &read_tmp); |
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if (ret < 0) |
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return ret; |
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*ambient_old_raw = (s16)read_tmp; |
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return 0; |
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} |
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static int mlx90632_read_object_raw_extended(struct regmap *regmap, s16 *object_new_raw) |
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{ |
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unsigned int read_tmp; |
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s32 read; |
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int ret; |
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ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_1, &read_tmp); |
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if (ret < 0) |
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return ret; |
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read = (s16)read_tmp; |
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ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_2, &read_tmp); |
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if (ret < 0) |
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return ret; |
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read = read - (s16)read_tmp; |
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ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_3, &read_tmp); |
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if (ret < 0) |
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return ret; |
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read = read - (s16)read_tmp; |
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ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_4, &read_tmp); |
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if (ret < 0) |
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return ret; |
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read = (read + (s16)read_tmp) / 2; |
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ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_5, &read_tmp); |
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if (ret < 0) |
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return ret; |
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read = read + (s16)read_tmp; |
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ret = regmap_read(regmap, MLX90632_RAM_DSP5_EXTENDED_OBJECT_6, &read_tmp); |
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if (ret < 0) |
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return ret; |
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read = read + (s16)read_tmp; |
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if (read > S16_MAX || read < S16_MIN) |
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return -ERANGE; |
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*object_new_raw = read; |
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return 0; |
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} |
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static int mlx90632_read_all_channel_extended(struct mlx90632_data *data, s16 *object_new_raw, |
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s16 *ambient_new_raw, s16 *ambient_old_raw) |
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{ |
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s32 ret, meas; |
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mutex_lock(&data->lock); |
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ret = mlx90632_set_meas_type(data->regmap, MLX90632_MTYP_EXTENDED); |
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if (ret < 0) |
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goto read_unlock; |
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ret = read_poll_timeout(mlx90632_perform_measurement, meas, meas == 19, |
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50000, 800000, false, data); |
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if (ret != 0) |
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goto read_unlock; |
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ret = mlx90632_read_object_raw_extended(data->regmap, object_new_raw); |
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if (ret < 0) |
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goto read_unlock; |
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ret = mlx90632_read_ambient_raw_extended(data->regmap, ambient_new_raw, ambient_old_raw); |
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read_unlock: |
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(void) mlx90632_set_meas_type(data->regmap, MLX90632_MTYP_MEDICAL); |
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mutex_unlock(&data->lock); |
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return ret; |
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} |
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static int mlx90632_read_ee_register(struct regmap *regmap, u16 reg_lsb, |
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s32 *reg_value) |
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{ |
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s32 ret; |
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unsigned int read; |
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u32 value; |
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|
|
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) |
|
{ |
|
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; |
|
|
|
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) |
|
{ |
|
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; |
|
case IIO_CHAN_INFO_CALIBAMBIENT: |
|
*val = data->object_ambient_temperature; |
|
return IIO_VAL_INT; |
|
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; |
|
case IIO_CHAN_INFO_CALIBAMBIENT: |
|
data->object_ambient_temperature = val; |
|
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) | BIT(IIO_CHAN_INFO_CALIBAMBIENT), |
|
}, |
|
}; |
|
|
|
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; |
|
mlx90632->mtyp = MLX90632_MTYP_MEDICAL; |
|
|
|
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; |
|
} |
|
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 */ |
|
|
|
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)); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Melexis MLX90632 contactless Infra Red temperature sensor driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|