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1018 lines
23 KiB
1018 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* isl29501.c: ISL29501 Time of Flight sensor driver. |
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* |
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* Copyright (C) 2018 |
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* Author: Mathieu Othacehe <[email protected]> |
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* |
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* 7-bit I2C slave address: 0x57 |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/err.h> |
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#include <linux/of_device.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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|
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#include <linux/iio/trigger_consumer.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/triggered_buffer.h> |
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|
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/* Control, setting and status registers */ |
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#define ISL29501_DEVICE_ID 0x00 |
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#define ISL29501_ID 0x0A |
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|
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/* Sampling control registers */ |
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#define ISL29501_INTEGRATION_PERIOD 0x10 |
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#define ISL29501_SAMPLE_PERIOD 0x11 |
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|
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/* Closed loop calibration registers */ |
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#define ISL29501_CROSSTALK_I_MSB 0x24 |
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#define ISL29501_CROSSTALK_I_LSB 0x25 |
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#define ISL29501_CROSSTALK_I_EXPONENT 0x26 |
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#define ISL29501_CROSSTALK_Q_MSB 0x27 |
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#define ISL29501_CROSSTALK_Q_LSB 0x28 |
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#define ISL29501_CROSSTALK_Q_EXPONENT 0x29 |
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#define ISL29501_CROSSTALK_GAIN_MSB 0x2A |
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#define ISL29501_CROSSTALK_GAIN_LSB 0x2B |
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#define ISL29501_MAGNITUDE_REF_EXP 0x2C |
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#define ISL29501_MAGNITUDE_REF_MSB 0x2D |
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#define ISL29501_MAGNITUDE_REF_LSB 0x2E |
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#define ISL29501_PHASE_OFFSET_MSB 0x2F |
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#define ISL29501_PHASE_OFFSET_LSB 0x30 |
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|
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/* Analog control registers */ |
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#define ISL29501_DRIVER_RANGE 0x90 |
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#define ISL29501_EMITTER_DAC 0x91 |
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|
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#define ISL29501_COMMAND_REGISTER 0xB0 |
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|
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/* Commands */ |
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#define ISL29501_EMUL_SAMPLE_START_PIN 0x49 |
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#define ISL29501_RESET_ALL_REGISTERS 0xD7 |
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#define ISL29501_RESET_INT_SM 0xD1 |
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|
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/* Ambiant light and temperature corrections */ |
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#define ISL29501_TEMP_REFERENCE 0x31 |
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#define ISL29501_PHASE_EXPONENT 0x33 |
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#define ISL29501_TEMP_COEFF_A 0x34 |
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#define ISL29501_TEMP_COEFF_B 0x39 |
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#define ISL29501_AMBIANT_COEFF_A 0x36 |
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#define ISL29501_AMBIANT_COEFF_B 0x3B |
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|
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/* Data output registers */ |
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#define ISL29501_DISTANCE_MSB_DATA 0xD1 |
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#define ISL29501_DISTANCE_LSB_DATA 0xD2 |
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#define ISL29501_PRECISION_MSB 0xD3 |
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#define ISL29501_PRECISION_LSB 0xD4 |
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#define ISL29501_MAGNITUDE_EXPONENT 0xD5 |
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#define ISL29501_MAGNITUDE_MSB 0xD6 |
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#define ISL29501_MAGNITUDE_LSB 0xD7 |
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#define ISL29501_PHASE_MSB 0xD8 |
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#define ISL29501_PHASE_LSB 0xD9 |
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#define ISL29501_I_RAW_EXPONENT 0xDA |
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#define ISL29501_I_RAW_MSB 0xDB |
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#define ISL29501_I_RAW_LSB 0xDC |
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#define ISL29501_Q_RAW_EXPONENT 0xDD |
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#define ISL29501_Q_RAW_MSB 0xDE |
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#define ISL29501_Q_RAW_LSB 0xDF |
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#define ISL29501_DIE_TEMPERATURE 0xE2 |
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#define ISL29501_AMBIENT_LIGHT 0xE3 |
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#define ISL29501_GAIN_MSB 0xE6 |
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#define ISL29501_GAIN_LSB 0xE7 |
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|
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#define ISL29501_MAX_EXP_VAL 15 |
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|
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#define ISL29501_INT_TIME_AVAILABLE \ |
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"0.00007 0.00014 0.00028 0.00057 0.00114 " \ |
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"0.00228 0.00455 0.00910 0.01820 0.03640 " \ |
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"0.07281 0.14561" |
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|
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#define ISL29501_CURRENT_SCALE_AVAILABLE \ |
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"0.0039 0.0078 0.0118 0.0157 0.0196 " \ |
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"0.0235 0.0275 0.0314 0.0352 0.0392 " \ |
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"0.0431 0.0471 0.0510 0.0549 0.0588" |
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|
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enum isl29501_correction_coeff { |
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COEFF_TEMP_A, |
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COEFF_TEMP_B, |
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COEFF_LIGHT_A, |
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COEFF_LIGHT_B, |
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COEFF_MAX, |
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}; |
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|
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struct isl29501_private { |
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struct i2c_client *client; |
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struct mutex lock; |
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/* Exact representation of correction coefficients. */ |
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unsigned int shadow_coeffs[COEFF_MAX]; |
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}; |
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|
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enum isl29501_register_name { |
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REG_DISTANCE, |
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REG_PHASE, |
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REG_TEMPERATURE, |
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REG_AMBIENT_LIGHT, |
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REG_GAIN, |
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REG_GAIN_BIAS, |
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REG_PHASE_EXP, |
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REG_CALIB_PHASE_TEMP_A, |
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REG_CALIB_PHASE_TEMP_B, |
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REG_CALIB_PHASE_LIGHT_A, |
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REG_CALIB_PHASE_LIGHT_B, |
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REG_DISTANCE_BIAS, |
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REG_TEMPERATURE_BIAS, |
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REG_INT_TIME, |
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REG_SAMPLE_TIME, |
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REG_DRIVER_RANGE, |
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REG_EMITTER_DAC, |
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}; |
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|
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struct isl29501_register_desc { |
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u8 msb; |
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u8 lsb; |
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}; |
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|
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static const struct isl29501_register_desc isl29501_registers[] = { |
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[REG_DISTANCE] = { |
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.msb = ISL29501_DISTANCE_MSB_DATA, |
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.lsb = ISL29501_DISTANCE_LSB_DATA, |
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}, |
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[REG_PHASE] = { |
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.msb = ISL29501_PHASE_MSB, |
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.lsb = ISL29501_PHASE_LSB, |
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}, |
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[REG_TEMPERATURE] = { |
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.lsb = ISL29501_DIE_TEMPERATURE, |
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}, |
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[REG_AMBIENT_LIGHT] = { |
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.lsb = ISL29501_AMBIENT_LIGHT, |
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}, |
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[REG_GAIN] = { |
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.msb = ISL29501_GAIN_MSB, |
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.lsb = ISL29501_GAIN_LSB, |
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}, |
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[REG_GAIN_BIAS] = { |
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.msb = ISL29501_CROSSTALK_GAIN_MSB, |
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.lsb = ISL29501_CROSSTALK_GAIN_LSB, |
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}, |
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[REG_PHASE_EXP] = { |
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.lsb = ISL29501_PHASE_EXPONENT, |
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}, |
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[REG_CALIB_PHASE_TEMP_A] = { |
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.lsb = ISL29501_TEMP_COEFF_A, |
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}, |
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[REG_CALIB_PHASE_TEMP_B] = { |
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.lsb = ISL29501_TEMP_COEFF_B, |
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}, |
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[REG_CALIB_PHASE_LIGHT_A] = { |
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.lsb = ISL29501_AMBIANT_COEFF_A, |
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}, |
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[REG_CALIB_PHASE_LIGHT_B] = { |
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.lsb = ISL29501_AMBIANT_COEFF_B, |
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}, |
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[REG_DISTANCE_BIAS] = { |
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.msb = ISL29501_PHASE_OFFSET_MSB, |
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.lsb = ISL29501_PHASE_OFFSET_LSB, |
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}, |
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[REG_TEMPERATURE_BIAS] = { |
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.lsb = ISL29501_TEMP_REFERENCE, |
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}, |
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[REG_INT_TIME] = { |
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.lsb = ISL29501_INTEGRATION_PERIOD, |
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}, |
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[REG_SAMPLE_TIME] = { |
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.lsb = ISL29501_SAMPLE_PERIOD, |
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}, |
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[REG_DRIVER_RANGE] = { |
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.lsb = ISL29501_DRIVER_RANGE, |
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}, |
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[REG_EMITTER_DAC] = { |
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.lsb = ISL29501_EMITTER_DAC, |
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}, |
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}; |
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|
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static int isl29501_register_read(struct isl29501_private *isl29501, |
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enum isl29501_register_name name, |
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u32 *val) |
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{ |
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const struct isl29501_register_desc *reg = &isl29501_registers[name]; |
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u8 msb = 0, lsb = 0; |
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s32 ret; |
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|
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mutex_lock(&isl29501->lock); |
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if (reg->msb) { |
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ret = i2c_smbus_read_byte_data(isl29501->client, reg->msb); |
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if (ret < 0) |
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goto err; |
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msb = ret; |
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} |
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|
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if (reg->lsb) { |
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ret = i2c_smbus_read_byte_data(isl29501->client, reg->lsb); |
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if (ret < 0) |
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goto err; |
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lsb = ret; |
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} |
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mutex_unlock(&isl29501->lock); |
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*val = (msb << 8) + lsb; |
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|
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return 0; |
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err: |
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mutex_unlock(&isl29501->lock); |
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|
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return ret; |
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} |
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static u32 isl29501_register_write(struct isl29501_private *isl29501, |
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enum isl29501_register_name name, |
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u32 value) |
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{ |
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const struct isl29501_register_desc *reg = &isl29501_registers[name]; |
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int ret; |
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if (!reg->msb && value > U8_MAX) |
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return -ERANGE; |
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if (value > U16_MAX) |
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return -ERANGE; |
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mutex_lock(&isl29501->lock); |
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if (reg->msb) { |
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ret = i2c_smbus_write_byte_data(isl29501->client, |
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reg->msb, value >> 8); |
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if (ret < 0) |
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goto err; |
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} |
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ret = i2c_smbus_write_byte_data(isl29501->client, reg->lsb, value); |
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|
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err: |
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mutex_unlock(&isl29501->lock); |
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return ret; |
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} |
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static ssize_t isl29501_read_ext(struct iio_dev *indio_dev, |
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uintptr_t private, |
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const struct iio_chan_spec *chan, |
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char *buf) |
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{ |
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struct isl29501_private *isl29501 = iio_priv(indio_dev); |
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enum isl29501_register_name reg = private; |
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int ret; |
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u32 value, gain, coeff, exp; |
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switch (reg) { |
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case REG_GAIN: |
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case REG_GAIN_BIAS: |
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ret = isl29501_register_read(isl29501, reg, &gain); |
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if (ret < 0) |
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return ret; |
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value = gain; |
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break; |
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case REG_CALIB_PHASE_TEMP_A: |
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case REG_CALIB_PHASE_TEMP_B: |
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case REG_CALIB_PHASE_LIGHT_A: |
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case REG_CALIB_PHASE_LIGHT_B: |
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ret = isl29501_register_read(isl29501, REG_PHASE_EXP, &exp); |
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if (ret < 0) |
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return ret; |
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ret = isl29501_register_read(isl29501, reg, &coeff); |
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if (ret < 0) |
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return ret; |
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value = coeff << exp; |
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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 sprintf(buf, "%u\n", value); |
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} |
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static int isl29501_set_shadow_coeff(struct isl29501_private *isl29501, |
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enum isl29501_register_name reg, |
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unsigned int val) |
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{ |
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enum isl29501_correction_coeff coeff; |
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|
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switch (reg) { |
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case REG_CALIB_PHASE_TEMP_A: |
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coeff = COEFF_TEMP_A; |
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break; |
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case REG_CALIB_PHASE_TEMP_B: |
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coeff = COEFF_TEMP_B; |
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break; |
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case REG_CALIB_PHASE_LIGHT_A: |
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coeff = COEFF_LIGHT_A; |
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break; |
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case REG_CALIB_PHASE_LIGHT_B: |
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coeff = COEFF_LIGHT_B; |
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break; |
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default: |
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return -EINVAL; |
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} |
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isl29501->shadow_coeffs[coeff] = val; |
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return 0; |
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} |
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static int isl29501_write_coeff(struct isl29501_private *isl29501, |
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enum isl29501_correction_coeff coeff, |
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int val) |
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{ |
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enum isl29501_register_name reg; |
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|
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switch (coeff) { |
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case COEFF_TEMP_A: |
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reg = REG_CALIB_PHASE_TEMP_A; |
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break; |
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case COEFF_TEMP_B: |
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reg = REG_CALIB_PHASE_TEMP_B; |
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break; |
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case COEFF_LIGHT_A: |
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reg = REG_CALIB_PHASE_LIGHT_A; |
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break; |
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case COEFF_LIGHT_B: |
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reg = REG_CALIB_PHASE_LIGHT_B; |
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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 isl29501_register_write(isl29501, reg, val); |
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} |
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static unsigned int isl29501_find_corr_exp(unsigned int val, |
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unsigned int max_exp, |
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unsigned int max_mantissa) |
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{ |
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unsigned int exp = 1; |
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|
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/* |
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* Correction coefficients are represented under |
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* mantissa * 2^exponent form, where mantissa and exponent |
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* are stored in two separate registers of the sensor. |
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* |
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* Compute and return the lowest exponent such as: |
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* mantissa = value / 2^exponent |
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* |
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* where mantissa < max_mantissa. |
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*/ |
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if (val <= max_mantissa) |
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return 0; |
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|
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while ((val >> exp) > max_mantissa) { |
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exp++; |
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|
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if (exp > max_exp) |
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return max_exp; |
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} |
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return exp; |
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} |
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static ssize_t isl29501_write_ext(struct iio_dev *indio_dev, |
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uintptr_t private, |
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const struct iio_chan_spec *chan, |
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const char *buf, size_t len) |
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{ |
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struct isl29501_private *isl29501 = iio_priv(indio_dev); |
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enum isl29501_register_name reg = private; |
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unsigned int val; |
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int max_exp = 0; |
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int ret; |
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int i; |
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|
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ret = kstrtouint(buf, 10, &val); |
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if (ret) |
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return ret; |
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|
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switch (reg) { |
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case REG_GAIN_BIAS: |
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if (val > U16_MAX) |
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return -ERANGE; |
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|
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ret = isl29501_register_write(isl29501, reg, val); |
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if (ret < 0) |
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return ret; |
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|
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break; |
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case REG_CALIB_PHASE_TEMP_A: |
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case REG_CALIB_PHASE_TEMP_B: |
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case REG_CALIB_PHASE_LIGHT_A: |
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case REG_CALIB_PHASE_LIGHT_B: |
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|
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if (val > (U8_MAX << ISL29501_MAX_EXP_VAL)) |
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return -ERANGE; |
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|
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/* Store the correction coefficient under its exact form. */ |
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ret = isl29501_set_shadow_coeff(isl29501, reg, val); |
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if (ret < 0) |
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return ret; |
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|
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/* |
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* Find the highest exponent needed to represent |
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* correction coefficients. |
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*/ |
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for (i = 0; i < COEFF_MAX; i++) { |
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int corr; |
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int corr_exp; |
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|
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corr = isl29501->shadow_coeffs[i]; |
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corr_exp = isl29501_find_corr_exp(corr, |
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ISL29501_MAX_EXP_VAL, |
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U8_MAX / 2); |
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dev_dbg(&isl29501->client->dev, |
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"found exp of corr(%d) = %d\n", corr, corr_exp); |
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|
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max_exp = max(max_exp, corr_exp); |
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} |
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|
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/* |
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* Represent every correction coefficient under |
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* mantissa * 2^max_exponent form and force the |
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* writing of those coefficients on the sensor. |
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*/ |
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for (i = 0; i < COEFF_MAX; i++) { |
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int corr; |
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int mantissa; |
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|
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corr = isl29501->shadow_coeffs[i]; |
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if (!corr) |
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continue; |
|
|
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mantissa = corr >> max_exp; |
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|
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ret = isl29501_write_coeff(isl29501, i, mantissa); |
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if (ret < 0) |
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return ret; |
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} |
|
|
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ret = isl29501_register_write(isl29501, REG_PHASE_EXP, max_exp); |
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if (ret < 0) |
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return ret; |
|
|
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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 len; |
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} |
|
|
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#define _ISL29501_EXT_INFO(_name, _ident) { \ |
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.name = _name, \ |
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.read = isl29501_read_ext, \ |
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.write = isl29501_write_ext, \ |
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.private = _ident, \ |
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.shared = IIO_SEPARATE, \ |
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} |
|
|
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static const struct iio_chan_spec_ext_info isl29501_ext_info[] = { |
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_ISL29501_EXT_INFO("agc_gain", REG_GAIN), |
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_ISL29501_EXT_INFO("agc_gain_bias", REG_GAIN_BIAS), |
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_ISL29501_EXT_INFO("calib_phase_temp_a", REG_CALIB_PHASE_TEMP_A), |
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_ISL29501_EXT_INFO("calib_phase_temp_b", REG_CALIB_PHASE_TEMP_B), |
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_ISL29501_EXT_INFO("calib_phase_light_a", REG_CALIB_PHASE_LIGHT_A), |
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_ISL29501_EXT_INFO("calib_phase_light_b", REG_CALIB_PHASE_LIGHT_B), |
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{ }, |
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}; |
|
|
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#define ISL29501_DISTANCE_SCAN_INDEX 0 |
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#define ISL29501_TIMESTAMP_SCAN_INDEX 1 |
|
|
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static const struct iio_chan_spec isl29501_channels[] = { |
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{ |
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.type = IIO_PROXIMITY, |
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.scan_index = ISL29501_DISTANCE_SCAN_INDEX, |
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.info_mask_separate = |
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BIT(IIO_CHAN_INFO_RAW) | |
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BIT(IIO_CHAN_INFO_SCALE) | |
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BIT(IIO_CHAN_INFO_CALIBBIAS), |
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.scan_type = { |
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.sign = 'u', |
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.realbits = 16, |
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.storagebits = 16, |
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.endianness = IIO_CPU, |
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}, |
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) | |
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BIT(IIO_CHAN_INFO_SAMP_FREQ), |
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.ext_info = isl29501_ext_info, |
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}, |
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{ |
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.type = IIO_PHASE, |
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.scan_index = -1, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
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BIT(IIO_CHAN_INFO_SCALE), |
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}, |
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{ |
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.type = IIO_CURRENT, |
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.scan_index = -1, |
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.output = 1, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
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BIT(IIO_CHAN_INFO_SCALE), |
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}, |
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{ |
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.type = IIO_TEMP, |
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.scan_index = -1, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
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BIT(IIO_CHAN_INFO_SCALE) | |
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BIT(IIO_CHAN_INFO_CALIBBIAS), |
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}, |
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{ |
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.type = IIO_INTENSITY, |
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.scan_index = -1, |
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.modified = 1, |
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.channel2 = IIO_MOD_LIGHT_CLEAR, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
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BIT(IIO_CHAN_INFO_SCALE), |
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}, |
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IIO_CHAN_SOFT_TIMESTAMP(ISL29501_TIMESTAMP_SCAN_INDEX), |
|
}; |
|
|
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static int isl29501_reset_registers(struct isl29501_private *isl29501) |
|
{ |
|
int ret; |
|
|
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ret = i2c_smbus_write_byte_data(isl29501->client, |
|
ISL29501_COMMAND_REGISTER, |
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ISL29501_RESET_ALL_REGISTERS); |
|
if (ret < 0) { |
|
dev_err(&isl29501->client->dev, |
|
"cannot reset registers %d\n", ret); |
|
return ret; |
|
} |
|
|
|
ret = i2c_smbus_write_byte_data(isl29501->client, |
|
ISL29501_COMMAND_REGISTER, |
|
ISL29501_RESET_INT_SM); |
|
if (ret < 0) |
|
dev_err(&isl29501->client->dev, |
|
"cannot reset state machine %d\n", ret); |
|
|
|
return ret; |
|
} |
|
|
|
static int isl29501_begin_acquisition(struct isl29501_private *isl29501) |
|
{ |
|
int ret; |
|
|
|
ret = i2c_smbus_write_byte_data(isl29501->client, |
|
ISL29501_COMMAND_REGISTER, |
|
ISL29501_EMUL_SAMPLE_START_PIN); |
|
if (ret < 0) |
|
dev_err(&isl29501->client->dev, |
|
"cannot begin acquisition %d\n", ret); |
|
|
|
return ret; |
|
} |
|
|
|
static IIO_CONST_ATTR_INT_TIME_AVAIL(ISL29501_INT_TIME_AVAILABLE); |
|
static IIO_CONST_ATTR(out_current_scale_available, |
|
ISL29501_CURRENT_SCALE_AVAILABLE); |
|
|
|
static struct attribute *isl29501_attributes[] = { |
|
&iio_const_attr_integration_time_available.dev_attr.attr, |
|
&iio_const_attr_out_current_scale_available.dev_attr.attr, |
|
NULL |
|
}; |
|
|
|
static const struct attribute_group isl29501_attribute_group = { |
|
.attrs = isl29501_attributes, |
|
}; |
|
|
|
static const int isl29501_current_scale_table[][2] = { |
|
{0, 3900}, {0, 7800}, {0, 11800}, {0, 15700}, |
|
{0, 19600}, {0, 23500}, {0, 27500}, {0, 31400}, |
|
{0, 35200}, {0, 39200}, {0, 43100}, {0, 47100}, |
|
{0, 51000}, {0, 54900}, {0, 58800}, |
|
}; |
|
|
|
static const int isl29501_int_time[][2] = { |
|
{0, 70}, /* 0.07 ms */ |
|
{0, 140}, /* 0.14 ms */ |
|
{0, 280}, /* 0.28 ms */ |
|
{0, 570}, /* 0.57 ms */ |
|
{0, 1140}, /* 1.14 ms */ |
|
{0, 2280}, /* 2.28 ms */ |
|
{0, 4550}, /* 4.55 ms */ |
|
{0, 9100}, /* 9.11 ms */ |
|
{0, 18200}, /* 18.2 ms */ |
|
{0, 36400}, /* 36.4 ms */ |
|
{0, 72810}, /* 72.81 ms */ |
|
{0, 145610} /* 145.28 ms */ |
|
}; |
|
|
|
static int isl29501_get_raw(struct isl29501_private *isl29501, |
|
const struct iio_chan_spec *chan, |
|
int *raw) |
|
{ |
|
int ret; |
|
|
|
switch (chan->type) { |
|
case IIO_PROXIMITY: |
|
ret = isl29501_register_read(isl29501, REG_DISTANCE, raw); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return IIO_VAL_INT; |
|
case IIO_INTENSITY: |
|
ret = isl29501_register_read(isl29501, |
|
REG_AMBIENT_LIGHT, |
|
raw); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return IIO_VAL_INT; |
|
case IIO_PHASE: |
|
ret = isl29501_register_read(isl29501, REG_PHASE, raw); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return IIO_VAL_INT; |
|
case IIO_CURRENT: |
|
ret = isl29501_register_read(isl29501, REG_EMITTER_DAC, raw); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return IIO_VAL_INT; |
|
case IIO_TEMP: |
|
ret = isl29501_register_read(isl29501, REG_TEMPERATURE, raw); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return IIO_VAL_INT; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static int isl29501_get_scale(struct isl29501_private *isl29501, |
|
const struct iio_chan_spec *chan, |
|
int *val, int *val2) |
|
{ |
|
int ret; |
|
u32 current_scale; |
|
|
|
switch (chan->type) { |
|
case IIO_PROXIMITY: |
|
/* distance = raw_distance * 33.31 / 65536 (m) */ |
|
*val = 3331; |
|
*val2 = 6553600; |
|
|
|
return IIO_VAL_FRACTIONAL; |
|
case IIO_PHASE: |
|
/* phase = raw_phase * 2pi / 65536 (rad) */ |
|
*val = 0; |
|
*val2 = 95874; |
|
|
|
return IIO_VAL_INT_PLUS_NANO; |
|
case IIO_INTENSITY: |
|
/* light = raw_light * 35 / 10000 (mA) */ |
|
*val = 35; |
|
*val2 = 10000; |
|
|
|
return IIO_VAL_FRACTIONAL; |
|
case IIO_CURRENT: |
|
ret = isl29501_register_read(isl29501, |
|
REG_DRIVER_RANGE, |
|
¤t_scale); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (current_scale > ARRAY_SIZE(isl29501_current_scale_table)) |
|
return -EINVAL; |
|
|
|
if (!current_scale) { |
|
*val = 0; |
|
*val2 = 0; |
|
return IIO_VAL_INT; |
|
} |
|
|
|
*val = isl29501_current_scale_table[current_scale - 1][0]; |
|
*val2 = isl29501_current_scale_table[current_scale - 1][1]; |
|
|
|
return IIO_VAL_INT_PLUS_MICRO; |
|
case IIO_TEMP: |
|
/* temperature = raw_temperature * 125 / 100000 (milli °C) */ |
|
*val = 125; |
|
*val2 = 100000; |
|
|
|
return IIO_VAL_FRACTIONAL; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static int isl29501_get_calibbias(struct isl29501_private *isl29501, |
|
const struct iio_chan_spec *chan, |
|
int *bias) |
|
{ |
|
switch (chan->type) { |
|
case IIO_PROXIMITY: |
|
return isl29501_register_read(isl29501, |
|
REG_DISTANCE_BIAS, |
|
bias); |
|
case IIO_TEMP: |
|
return isl29501_register_read(isl29501, |
|
REG_TEMPERATURE_BIAS, |
|
bias); |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static int isl29501_get_inttime(struct isl29501_private *isl29501, |
|
int *val, int *val2) |
|
{ |
|
int ret; |
|
u32 inttime; |
|
|
|
ret = isl29501_register_read(isl29501, REG_INT_TIME, &inttime); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (inttime >= ARRAY_SIZE(isl29501_int_time)) |
|
return -EINVAL; |
|
|
|
*val = isl29501_int_time[inttime][0]; |
|
*val2 = isl29501_int_time[inttime][1]; |
|
|
|
return IIO_VAL_INT_PLUS_MICRO; |
|
} |
|
|
|
static int isl29501_get_freq(struct isl29501_private *isl29501, |
|
int *val, int *val2) |
|
{ |
|
int ret; |
|
int sample_time; |
|
unsigned long long freq; |
|
u32 temp; |
|
|
|
ret = isl29501_register_read(isl29501, REG_SAMPLE_TIME, &sample_time); |
|
if (ret < 0) |
|
return ret; |
|
|
|
/* freq = 1 / (0.000450 * (sample_time + 1) * 10^-6) */ |
|
freq = 1000000ULL * 1000000ULL; |
|
|
|
do_div(freq, 450 * (sample_time + 1)); |
|
|
|
temp = do_div(freq, 1000000); |
|
*val = freq; |
|
*val2 = temp; |
|
|
|
return IIO_VAL_INT_PLUS_MICRO; |
|
} |
|
|
|
static int isl29501_read_raw(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, int *val, |
|
int *val2, long mask) |
|
{ |
|
struct isl29501_private *isl29501 = iio_priv(indio_dev); |
|
|
|
switch (mask) { |
|
case IIO_CHAN_INFO_RAW: |
|
return isl29501_get_raw(isl29501, chan, val); |
|
case IIO_CHAN_INFO_SCALE: |
|
return isl29501_get_scale(isl29501, chan, val, val2); |
|
case IIO_CHAN_INFO_INT_TIME: |
|
return isl29501_get_inttime(isl29501, val, val2); |
|
case IIO_CHAN_INFO_SAMP_FREQ: |
|
return isl29501_get_freq(isl29501, val, val2); |
|
case IIO_CHAN_INFO_CALIBBIAS: |
|
return isl29501_get_calibbias(isl29501, chan, val); |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static int isl29501_set_raw(struct isl29501_private *isl29501, |
|
const struct iio_chan_spec *chan, |
|
int raw) |
|
{ |
|
switch (chan->type) { |
|
case IIO_CURRENT: |
|
return isl29501_register_write(isl29501, REG_EMITTER_DAC, raw); |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static int isl29501_set_inttime(struct isl29501_private *isl29501, |
|
int val, int val2) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(isl29501_int_time); i++) { |
|
if (isl29501_int_time[i][0] == val && |
|
isl29501_int_time[i][1] == val2) { |
|
return isl29501_register_write(isl29501, |
|
REG_INT_TIME, |
|
i); |
|
} |
|
} |
|
|
|
return -EINVAL; |
|
} |
|
|
|
static int isl29501_set_scale(struct isl29501_private *isl29501, |
|
const struct iio_chan_spec *chan, |
|
int val, int val2) |
|
{ |
|
int i; |
|
|
|
if (chan->type != IIO_CURRENT) |
|
return -EINVAL; |
|
|
|
for (i = 0; i < ARRAY_SIZE(isl29501_current_scale_table); i++) { |
|
if (isl29501_current_scale_table[i][0] == val && |
|
isl29501_current_scale_table[i][1] == val2) { |
|
return isl29501_register_write(isl29501, |
|
REG_DRIVER_RANGE, |
|
i + 1); |
|
} |
|
} |
|
|
|
return -EINVAL; |
|
} |
|
|
|
static int isl29501_set_calibbias(struct isl29501_private *isl29501, |
|
const struct iio_chan_spec *chan, |
|
int bias) |
|
{ |
|
switch (chan->type) { |
|
case IIO_PROXIMITY: |
|
return isl29501_register_write(isl29501, |
|
REG_DISTANCE_BIAS, |
|
bias); |
|
case IIO_TEMP: |
|
return isl29501_register_write(isl29501, |
|
REG_TEMPERATURE_BIAS, |
|
bias); |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static int isl29501_set_freq(struct isl29501_private *isl29501, |
|
int val, int val2) |
|
{ |
|
int freq; |
|
unsigned long long sample_time; |
|
|
|
/* sample_freq = 1 / (0.000450 * (sample_time + 1) * 10^-6) */ |
|
freq = val * 1000000 + val2 % 1000000; |
|
sample_time = 2222ULL * 1000000ULL; |
|
do_div(sample_time, freq); |
|
|
|
sample_time -= 1; |
|
|
|
if (sample_time > 255) |
|
return -ERANGE; |
|
|
|
return isl29501_register_write(isl29501, REG_SAMPLE_TIME, sample_time); |
|
} |
|
|
|
static int isl29501_write_raw(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, |
|
int val, int val2, long mask) |
|
{ |
|
struct isl29501_private *isl29501 = iio_priv(indio_dev); |
|
|
|
switch (mask) { |
|
case IIO_CHAN_INFO_RAW: |
|
return isl29501_set_raw(isl29501, chan, val); |
|
case IIO_CHAN_INFO_INT_TIME: |
|
return isl29501_set_inttime(isl29501, val, val2); |
|
case IIO_CHAN_INFO_SAMP_FREQ: |
|
return isl29501_set_freq(isl29501, val, val2); |
|
case IIO_CHAN_INFO_SCALE: |
|
return isl29501_set_scale(isl29501, chan, val, val2); |
|
case IIO_CHAN_INFO_CALIBBIAS: |
|
return isl29501_set_calibbias(isl29501, chan, val); |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static const struct iio_info isl29501_info = { |
|
.read_raw = &isl29501_read_raw, |
|
.write_raw = &isl29501_write_raw, |
|
.attrs = &isl29501_attribute_group, |
|
}; |
|
|
|
static int isl29501_init_chip(struct isl29501_private *isl29501) |
|
{ |
|
int ret; |
|
|
|
ret = i2c_smbus_read_byte_data(isl29501->client, ISL29501_DEVICE_ID); |
|
if (ret < 0) { |
|
dev_err(&isl29501->client->dev, "Error reading device id\n"); |
|
return ret; |
|
} |
|
|
|
if (ret != ISL29501_ID) { |
|
dev_err(&isl29501->client->dev, |
|
"Wrong chip id, got %x expected %x\n", |
|
ret, ISL29501_DEVICE_ID); |
|
return -ENODEV; |
|
} |
|
|
|
ret = isl29501_reset_registers(isl29501); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return isl29501_begin_acquisition(isl29501); |
|
} |
|
|
|
static irqreturn_t isl29501_trigger_handler(int irq, void *p) |
|
{ |
|
struct iio_poll_func *pf = p; |
|
struct iio_dev *indio_dev = pf->indio_dev; |
|
struct isl29501_private *isl29501 = iio_priv(indio_dev); |
|
const unsigned long *active_mask = indio_dev->active_scan_mask; |
|
u32 buffer[4] = {}; /* 1x16-bit + ts */ |
|
|
|
if (test_bit(ISL29501_DISTANCE_SCAN_INDEX, active_mask)) |
|
isl29501_register_read(isl29501, REG_DISTANCE, buffer); |
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, buffer, pf->timestamp); |
|
iio_trigger_notify_done(indio_dev->trig); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static int isl29501_probe(struct i2c_client *client, |
|
const struct i2c_device_id *id) |
|
{ |
|
struct iio_dev *indio_dev; |
|
struct isl29501_private *isl29501; |
|
int ret; |
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*isl29501)); |
|
if (!indio_dev) |
|
return -ENOMEM; |
|
|
|
isl29501 = iio_priv(indio_dev); |
|
|
|
i2c_set_clientdata(client, indio_dev); |
|
isl29501->client = client; |
|
|
|
mutex_init(&isl29501->lock); |
|
|
|
ret = isl29501_init_chip(isl29501); |
|
if (ret < 0) |
|
return ret; |
|
|
|
indio_dev->modes = INDIO_DIRECT_MODE; |
|
indio_dev->channels = isl29501_channels; |
|
indio_dev->num_channels = ARRAY_SIZE(isl29501_channels); |
|
indio_dev->name = client->name; |
|
indio_dev->info = &isl29501_info; |
|
|
|
ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, |
|
iio_pollfunc_store_time, |
|
isl29501_trigger_handler, |
|
NULL); |
|
if (ret < 0) { |
|
dev_err(&client->dev, "unable to setup iio triggered buffer\n"); |
|
return ret; |
|
} |
|
|
|
return devm_iio_device_register(&client->dev, indio_dev); |
|
} |
|
|
|
static const struct i2c_device_id isl29501_id[] = { |
|
{"isl29501", 0}, |
|
{} |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(i2c, isl29501_id); |
|
|
|
#if defined(CONFIG_OF) |
|
static const struct of_device_id isl29501_i2c_matches[] = { |
|
{ .compatible = "renesas,isl29501" }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, isl29501_i2c_matches); |
|
#endif |
|
|
|
static struct i2c_driver isl29501_driver = { |
|
.driver = { |
|
.name = "isl29501", |
|
}, |
|
.id_table = isl29501_id, |
|
.probe = isl29501_probe, |
|
}; |
|
module_i2c_driver(isl29501_driver); |
|
|
|
MODULE_AUTHOR("Mathieu Othacehe <[email protected]>"); |
|
MODULE_DESCRIPTION("ISL29501 Time of Flight sensor driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|