diff options
Diffstat (limited to 'drivers/iio/proximity/isl29501.c')
| -rw-r--r-- | drivers/iio/proximity/isl29501.c | 1027 |
1 files changed, 1027 insertions, 0 deletions
diff --git a/drivers/iio/proximity/isl29501.c b/drivers/iio/proximity/isl29501.c new file mode 100644 index 000000000000..e5e94540f404 --- /dev/null +++ b/drivers/iio/proximity/isl29501.c @@ -0,0 +1,1027 @@ +// 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] = {}; /* 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->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"); 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