1018 lines
23 KiB
C
1018 lines
23 KiB
C
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// 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 <m.othacehe@gmail.com>
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*
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* 7-bit I2C slave address: 0x57
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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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#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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/* 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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/* 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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/* 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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/* 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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#define ISL29501_COMMAND_REGISTER 0xB0
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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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/* 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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/* 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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#define ISL29501_MAX_EXP_VAL 15
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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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#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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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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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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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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struct isl29501_register_desc {
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u8 msb;
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u8 lsb;
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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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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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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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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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return 0;
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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 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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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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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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|
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enum isl29501_correction_coeff coeff,
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int val)
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|
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{
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enum isl29501_register_name reg;
|
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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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||
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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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||
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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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||
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default:
|
||
|
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return -EINVAL;
|
||
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}
|
||
|
|
|
||
|
|
return isl29501_register_write(isl29501, reg, val);
|
||
|
|
}
|
||
|
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|
||
|
|
static unsigned int isl29501_find_corr_exp(unsigned int val,
|
||
|
|
unsigned int max_exp,
|
||
|
|
unsigned int max_mantissa)
|
||
|
|
{
|
||
|
|
unsigned int exp = 1;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Correction coefficients are represented under
|
||
|
|
* mantissa * 2^exponent form, where mantissa and exponent
|
||
|
|
* are stored in two separate registers of the sensor.
|
||
|
|
*
|
||
|
|
* Compute and return the lowest exponent such as:
|
||
|
|
* mantissa = value / 2^exponent
|
||
|
|
*
|
||
|
|
* where mantissa < max_mantissa.
|
||
|
|
*/
|
||
|
|
if (val <= max_mantissa)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
while ((val >> exp) > max_mantissa) {
|
||
|
|
exp++;
|
||
|
|
|
||
|
|
if (exp > max_exp)
|
||
|
|
return max_exp;
|
||
|
|
}
|
||
|
|
|
||
|
|
return exp;
|
||
|
|
}
|
||
|
|
|
||
|
|
static ssize_t isl29501_write_ext(struct iio_dev *indio_dev,
|
||
|
|
uintptr_t private,
|
||
|
|
const struct iio_chan_spec *chan,
|
||
|
|
const char *buf, size_t len)
|
||
|
|
{
|
||
|
|
struct isl29501_private *isl29501 = iio_priv(indio_dev);
|
||
|
|
enum isl29501_register_name reg = private;
|
||
|
|
unsigned int val;
|
||
|
|
int max_exp = 0;
|
||
|
|
int ret;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
ret = kstrtouint(buf, 10, &val);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
switch (reg) {
|
||
|
|
case REG_GAIN_BIAS:
|
||
|
|
if (val > U16_MAX)
|
||
|
|
return -ERANGE;
|
||
|
|
|
||
|
|
ret = isl29501_register_write(isl29501, reg, val);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
break;
|
||
|
|
case REG_CALIB_PHASE_TEMP_A:
|
||
|
|
case REG_CALIB_PHASE_TEMP_B:
|
||
|
|
case REG_CALIB_PHASE_LIGHT_A:
|
||
|
|
case REG_CALIB_PHASE_LIGHT_B:
|
||
|
|
|
||
|
|
if (val > (U8_MAX << ISL29501_MAX_EXP_VAL))
|
||
|
|
return -ERANGE;
|
||
|
|
|
||
|
|
/* Store the correction coefficient under its exact form. */
|
||
|
|
ret = isl29501_set_shadow_coeff(isl29501, reg, val);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Find the highest exponent needed to represent
|
||
|
|
* correction coefficients.
|
||
|
|
*/
|
||
|
|
for (i = 0; i < COEFF_MAX; i++) {
|
||
|
|
int corr;
|
||
|
|
int corr_exp;
|
||
|
|
|
||
|
|
corr = isl29501->shadow_coeffs[i];
|
||
|
|
corr_exp = isl29501_find_corr_exp(corr,
|
||
|
|
ISL29501_MAX_EXP_VAL,
|
||
|
|
U8_MAX / 2);
|
||
|
|
dev_dbg(&isl29501->client->dev,
|
||
|
|
"found exp of corr(%d) = %d\n", corr, corr_exp);
|
||
|
|
|
||
|
|
max_exp = max(max_exp, corr_exp);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Represent every correction coefficient under
|
||
|
|
* mantissa * 2^max_exponent form and force the
|
||
|
|
* writing of those coefficients on the sensor.
|
||
|
|
*/
|
||
|
|
for (i = 0; i < COEFF_MAX; i++) {
|
||
|
|
int corr;
|
||
|
|
int mantissa;
|
||
|
|
|
||
|
|
corr = isl29501->shadow_coeffs[i];
|
||
|
|
if (!corr)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
mantissa = corr >> max_exp;
|
||
|
|
|
||
|
|
ret = isl29501_write_coeff(isl29501, i, mantissa);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = isl29501_register_write(isl29501, REG_PHASE_EXP, max_exp);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return len;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define _ISL29501_EXT_INFO(_name, _ident) { \
|
||
|
|
.name = _name, \
|
||
|
|
.read = isl29501_read_ext, \
|
||
|
|
.write = isl29501_write_ext, \
|
||
|
|
.private = _ident, \
|
||
|
|
.shared = IIO_SEPARATE, \
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct iio_chan_spec_ext_info isl29501_ext_info[] = {
|
||
|
|
_ISL29501_EXT_INFO("agc_gain", REG_GAIN),
|
||
|
|
_ISL29501_EXT_INFO("agc_gain_bias", REG_GAIN_BIAS),
|
||
|
|
_ISL29501_EXT_INFO("calib_phase_temp_a", REG_CALIB_PHASE_TEMP_A),
|
||
|
|
_ISL29501_EXT_INFO("calib_phase_temp_b", REG_CALIB_PHASE_TEMP_B),
|
||
|
|
_ISL29501_EXT_INFO("calib_phase_light_a", REG_CALIB_PHASE_LIGHT_A),
|
||
|
|
_ISL29501_EXT_INFO("calib_phase_light_b", REG_CALIB_PHASE_LIGHT_B),
|
||
|
|
{ },
|
||
|
|
};
|
||
|
|
|
||
|
|
#define ISL29501_DISTANCE_SCAN_INDEX 0
|
||
|
|
#define ISL29501_TIMESTAMP_SCAN_INDEX 1
|
||
|
|
|
||
|
|
static const struct iio_chan_spec isl29501_channels[] = {
|
||
|
|
{
|
||
|
|
.type = IIO_PROXIMITY,
|
||
|
|
.scan_index = ISL29501_DISTANCE_SCAN_INDEX,
|
||
|
|
.info_mask_separate =
|
||
|
|
BIT(IIO_CHAN_INFO_RAW) |
|
||
|
|
BIT(IIO_CHAN_INFO_SCALE) |
|
||
|
|
BIT(IIO_CHAN_INFO_CALIBBIAS),
|
||
|
|
.scan_type = {
|
||
|
|
.sign = 'u',
|
||
|
|
.realbits = 16,
|
||
|
|
.storagebits = 16,
|
||
|
|
.endianness = IIO_CPU,
|
||
|
|
},
|
||
|
|
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) |
|
||
|
|
BIT(IIO_CHAN_INFO_SAMP_FREQ),
|
||
|
|
.ext_info = isl29501_ext_info,
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.type = IIO_PHASE,
|
||
|
|
.scan_index = -1,
|
||
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
||
|
|
BIT(IIO_CHAN_INFO_SCALE),
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.type = IIO_CURRENT,
|
||
|
|
.scan_index = -1,
|
||
|
|
.output = 1,
|
||
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
||
|
|
BIT(IIO_CHAN_INFO_SCALE),
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.type = IIO_TEMP,
|
||
|
|
.scan_index = -1,
|
||
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
||
|
|
BIT(IIO_CHAN_INFO_SCALE) |
|
||
|
|
BIT(IIO_CHAN_INFO_CALIBBIAS),
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.type = IIO_INTENSITY,
|
||
|
|
.scan_index = -1,
|
||
|
|
.modified = 1,
|
||
|
|
.channel2 = IIO_MOD_LIGHT_CLEAR,
|
||
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
||
|
|
BIT(IIO_CHAN_INFO_SCALE),
|
||
|
|
},
|
||
|
|
IIO_CHAN_SOFT_TIMESTAMP(ISL29501_TIMESTAMP_SCAN_INDEX),
|
||
|
|
};
|
||
|
|
|
||
|
|
static int isl29501_reset_registers(struct isl29501_private *isl29501)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = i2c_smbus_write_byte_data(isl29501->client,
|
||
|
|
ISL29501_COMMAND_REGISTER,
|
||
|
|
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] __aligned(8) = {}; /* 1x16-bit + naturally aligned 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)
|
||
|
|
{
|
||
|
|
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_new = isl29501_probe,
|
||
|
|
};
|
||
|
|
module_i2c_driver(isl29501_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Mathieu Othacehe <m.othacehe@gmail.com>");
|
||
|
|
MODULE_DESCRIPTION("ISL29501 Time of Flight sensor driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|