| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * isl29501.c: ISL29501 Time of Flight sensor driver. |
| * |
| * Copyright (C) 2018 |
| * Author: Mathieu Othacehe <m.othacehe@gmail.com> |
| * |
| * 7-bit I2C slave address: 0x57 |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/i2c.h> |
| #include <linux/err.h> |
| #include <linux/of_device.h> |
| #include <linux/iio/iio.h> |
| #include <linux/iio/sysfs.h> |
| |
| #include <linux/iio/trigger_consumer.h> |
| #include <linux/iio/buffer.h> |
| #include <linux/iio/triggered_buffer.h> |
| |
| /* Control, setting and status registers */ |
| #define ISL29501_DEVICE_ID 0x00 |
| #define ISL29501_ID 0x0A |
| |
| /* Sampling control registers */ |
| #define ISL29501_INTEGRATION_PERIOD 0x10 |
| #define ISL29501_SAMPLE_PERIOD 0x11 |
| |
| /* Closed loop calibration registers */ |
| #define ISL29501_CROSSTALK_I_MSB 0x24 |
| #define ISL29501_CROSSTALK_I_LSB 0x25 |
| #define ISL29501_CROSSTALK_I_EXPONENT 0x26 |
| #define ISL29501_CROSSTALK_Q_MSB 0x27 |
| #define ISL29501_CROSSTALK_Q_LSB 0x28 |
| #define ISL29501_CROSSTALK_Q_EXPONENT 0x29 |
| #define ISL29501_CROSSTALK_GAIN_MSB 0x2A |
| #define ISL29501_CROSSTALK_GAIN_LSB 0x2B |
| #define ISL29501_MAGNITUDE_REF_EXP 0x2C |
| #define ISL29501_MAGNITUDE_REF_MSB 0x2D |
| #define ISL29501_MAGNITUDE_REF_LSB 0x2E |
| #define ISL29501_PHASE_OFFSET_MSB 0x2F |
| #define ISL29501_PHASE_OFFSET_LSB 0x30 |
| |
| /* Analog control registers */ |
| #define ISL29501_DRIVER_RANGE 0x90 |
| #define ISL29501_EMITTER_DAC 0x91 |
| |
| #define ISL29501_COMMAND_REGISTER 0xB0 |
| |
| /* Commands */ |
| #define ISL29501_EMUL_SAMPLE_START_PIN 0x49 |
| #define ISL29501_RESET_ALL_REGISTERS 0xD7 |
| #define ISL29501_RESET_INT_SM 0xD1 |
| |
| /* Ambiant light and temperature corrections */ |
| #define ISL29501_TEMP_REFERENCE 0x31 |
| #define ISL29501_PHASE_EXPONENT 0x33 |
| #define ISL29501_TEMP_COEFF_A 0x34 |
| #define ISL29501_TEMP_COEFF_B 0x39 |
| #define ISL29501_AMBIANT_COEFF_A 0x36 |
| #define ISL29501_AMBIANT_COEFF_B 0x3B |
| |
| /* Data output registers */ |
| #define ISL29501_DISTANCE_MSB_DATA 0xD1 |
| #define ISL29501_DISTANCE_LSB_DATA 0xD2 |
| #define ISL29501_PRECISION_MSB 0xD3 |
| #define ISL29501_PRECISION_LSB 0xD4 |
| #define ISL29501_MAGNITUDE_EXPONENT 0xD5 |
| #define ISL29501_MAGNITUDE_MSB 0xD6 |
| #define ISL29501_MAGNITUDE_LSB 0xD7 |
| #define ISL29501_PHASE_MSB 0xD8 |
| #define ISL29501_PHASE_LSB 0xD9 |
| #define ISL29501_I_RAW_EXPONENT 0xDA |
| #define ISL29501_I_RAW_MSB 0xDB |
| #define ISL29501_I_RAW_LSB 0xDC |
| #define ISL29501_Q_RAW_EXPONENT 0xDD |
| #define ISL29501_Q_RAW_MSB 0xDE |
| #define ISL29501_Q_RAW_LSB 0xDF |
| #define ISL29501_DIE_TEMPERATURE 0xE2 |
| #define ISL29501_AMBIENT_LIGHT 0xE3 |
| #define ISL29501_GAIN_MSB 0xE6 |
| #define ISL29501_GAIN_LSB 0xE7 |
| |
| #define ISL29501_MAX_EXP_VAL 15 |
| |
| #define ISL29501_INT_TIME_AVAILABLE \ |
| "0.00007 0.00014 0.00028 0.00057 0.00114 " \ |
| "0.00228 0.00455 0.00910 0.01820 0.03640 " \ |
| "0.07281 0.14561" |
| |
| #define ISL29501_CURRENT_SCALE_AVAILABLE \ |
| "0.0039 0.0078 0.0118 0.0157 0.0196 " \ |
| "0.0235 0.0275 0.0314 0.0352 0.0392 " \ |
| "0.0431 0.0471 0.0510 0.0549 0.0588" |
| |
| enum isl29501_correction_coeff { |
| COEFF_TEMP_A, |
| COEFF_TEMP_B, |
| COEFF_LIGHT_A, |
| COEFF_LIGHT_B, |
| COEFF_MAX, |
| }; |
| |
| struct isl29501_private { |
| struct i2c_client *client; |
| struct mutex lock; |
| /* Exact representation of correction coefficients. */ |
| unsigned int shadow_coeffs[COEFF_MAX]; |
| }; |
| |
| enum isl29501_register_name { |
| REG_DISTANCE, |
| REG_PHASE, |
| REG_TEMPERATURE, |
| REG_AMBIENT_LIGHT, |
| REG_GAIN, |
| REG_GAIN_BIAS, |
| REG_PHASE_EXP, |
| REG_CALIB_PHASE_TEMP_A, |
| REG_CALIB_PHASE_TEMP_B, |
| REG_CALIB_PHASE_LIGHT_A, |
| REG_CALIB_PHASE_LIGHT_B, |
| REG_DISTANCE_BIAS, |
| REG_TEMPERATURE_BIAS, |
| REG_INT_TIME, |
| REG_SAMPLE_TIME, |
| REG_DRIVER_RANGE, |
| REG_EMITTER_DAC, |
| }; |
| |
| struct isl29501_register_desc { |
| u8 msb; |
| u8 lsb; |
| }; |
| |
| static const struct isl29501_register_desc isl29501_registers[] = { |
| [REG_DISTANCE] = { |
| .msb = ISL29501_DISTANCE_MSB_DATA, |
| .lsb = ISL29501_DISTANCE_LSB_DATA, |
| }, |
| [REG_PHASE] = { |
| .msb = ISL29501_PHASE_MSB, |
| .lsb = ISL29501_PHASE_LSB, |
| }, |
| [REG_TEMPERATURE] = { |
| .lsb = ISL29501_DIE_TEMPERATURE, |
| }, |
| [REG_AMBIENT_LIGHT] = { |
| .lsb = ISL29501_AMBIENT_LIGHT, |
| }, |
| [REG_GAIN] = { |
| .msb = ISL29501_GAIN_MSB, |
| .lsb = ISL29501_GAIN_LSB, |
| }, |
| [REG_GAIN_BIAS] = { |
| .msb = ISL29501_CROSSTALK_GAIN_MSB, |
| .lsb = ISL29501_CROSSTALK_GAIN_LSB, |
| }, |
| [REG_PHASE_EXP] = { |
| .lsb = ISL29501_PHASE_EXPONENT, |
| }, |
| [REG_CALIB_PHASE_TEMP_A] = { |
| .lsb = ISL29501_TEMP_COEFF_A, |
| }, |
| [REG_CALIB_PHASE_TEMP_B] = { |
| .lsb = ISL29501_TEMP_COEFF_B, |
| }, |
| [REG_CALIB_PHASE_LIGHT_A] = { |
| .lsb = ISL29501_AMBIANT_COEFF_A, |
| }, |
| [REG_CALIB_PHASE_LIGHT_B] = { |
| .lsb = ISL29501_AMBIANT_COEFF_B, |
| }, |
| [REG_DISTANCE_BIAS] = { |
| .msb = ISL29501_PHASE_OFFSET_MSB, |
| .lsb = ISL29501_PHASE_OFFSET_LSB, |
| }, |
| [REG_TEMPERATURE_BIAS] = { |
| .lsb = ISL29501_TEMP_REFERENCE, |
| }, |
| [REG_INT_TIME] = { |
| .lsb = ISL29501_INTEGRATION_PERIOD, |
| }, |
| [REG_SAMPLE_TIME] = { |
| .lsb = ISL29501_SAMPLE_PERIOD, |
| }, |
| [REG_DRIVER_RANGE] = { |
| .lsb = ISL29501_DRIVER_RANGE, |
| }, |
| [REG_EMITTER_DAC] = { |
| .lsb = ISL29501_EMITTER_DAC, |
| }, |
| }; |
| |
| static int isl29501_register_read(struct isl29501_private *isl29501, |
| enum isl29501_register_name name, |
| u32 *val) |
| { |
| const struct isl29501_register_desc *reg = &isl29501_registers[name]; |
| u8 msb = 0, lsb = 0; |
| s32 ret; |
| |
| mutex_lock(&isl29501->lock); |
| if (reg->msb) { |
| ret = i2c_smbus_read_byte_data(isl29501->client, reg->msb); |
| if (ret < 0) |
| goto err; |
| msb = ret; |
| } |
| |
| if (reg->lsb) { |
| ret = i2c_smbus_read_byte_data(isl29501->client, reg->lsb); |
| if (ret < 0) |
| goto err; |
| lsb = ret; |
| } |
| mutex_unlock(&isl29501->lock); |
| |
| *val = (msb << 8) + lsb; |
| |
| return 0; |
| err: |
| mutex_unlock(&isl29501->lock); |
| |
| return ret; |
| } |
| |
| static u32 isl29501_register_write(struct isl29501_private *isl29501, |
| enum isl29501_register_name name, |
| u32 value) |
| { |
| const struct isl29501_register_desc *reg = &isl29501_registers[name]; |
| u8 msb, lsb; |
| int ret; |
| |
| if (!reg->msb && value > U8_MAX) |
| return -ERANGE; |
| |
| if (value > U16_MAX) |
| return -ERANGE; |
| |
| if (!reg->msb) { |
| lsb = value & 0xFF; |
| } else { |
| msb = (value >> 8) & 0xFF; |
| lsb = value & 0xFF; |
| } |
| |
| mutex_lock(&isl29501->lock); |
| if (reg->msb) { |
| ret = i2c_smbus_write_byte_data(isl29501->client, |
| reg->msb, msb); |
| if (ret < 0) |
| goto err; |
| } |
| |
| ret = i2c_smbus_write_byte_data(isl29501->client, reg->lsb, lsb); |
| |
| err: |
| mutex_unlock(&isl29501->lock); |
| return ret; |
| } |
| |
| static ssize_t isl29501_read_ext(struct iio_dev *indio_dev, |
| uintptr_t private, |
| const struct iio_chan_spec *chan, |
| char *buf) |
| { |
| struct isl29501_private *isl29501 = iio_priv(indio_dev); |
| enum isl29501_register_name reg = private; |
| int ret; |
| u32 value, gain, coeff, exp; |
| |
| switch (reg) { |
| case REG_GAIN: |
| case REG_GAIN_BIAS: |
| ret = isl29501_register_read(isl29501, reg, &gain); |
| if (ret < 0) |
| return ret; |
| |
| value = gain; |
| 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: |
| ret = isl29501_register_read(isl29501, REG_PHASE_EXP, &exp); |
| if (ret < 0) |
| return ret; |
| |
| ret = isl29501_register_read(isl29501, reg, &coeff); |
| if (ret < 0) |
| return ret; |
| |
| value = coeff << exp; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return sprintf(buf, "%u\n", value); |
| } |
| |
| static int isl29501_set_shadow_coeff(struct isl29501_private *isl29501, |
| enum isl29501_register_name reg, |
| unsigned int val) |
| { |
| enum isl29501_correction_coeff coeff; |
| |
| switch (reg) { |
| case REG_CALIB_PHASE_TEMP_A: |
| coeff = COEFF_TEMP_A; |
| break; |
| case REG_CALIB_PHASE_TEMP_B: |
| coeff = COEFF_TEMP_B; |
| break; |
| case REG_CALIB_PHASE_LIGHT_A: |
| coeff = COEFF_LIGHT_A; |
| break; |
| case REG_CALIB_PHASE_LIGHT_B: |
| coeff = COEFF_LIGHT_B; |
| break; |
| default: |
| return -EINVAL; |
| } |
| isl29501->shadow_coeffs[coeff] = val; |
| |
| return 0; |
| } |
| |
| static int isl29501_write_coeff(struct isl29501_private *isl29501, |
| enum isl29501_correction_coeff coeff, |
| int val) |
| { |
| enum isl29501_register_name reg; |
| |
| switch (coeff) { |
| case COEFF_TEMP_A: |
| reg = REG_CALIB_PHASE_TEMP_A; |
| break; |
| case COEFF_TEMP_B: |
| reg = REG_CALIB_PHASE_TEMP_B; |
| break; |
| case COEFF_LIGHT_A: |
| reg = REG_CALIB_PHASE_LIGHT_A; |
| break; |
| case COEFF_LIGHT_B: |
| reg = REG_CALIB_PHASE_LIGHT_B; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return isl29501_register_write(isl29501, reg, val); |
| } |
| |
| 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, |
| 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->dev.parent = &client->dev; |
| 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 <m.othacehe@gmail.com>"); |
| MODULE_DESCRIPTION("ISL29501 Time of Flight sensor driver"); |
| MODULE_LICENSE("GPL v2"); |