--- /dev/null
+// 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");
projects / openwrt / staging / blogic.git / commitdiff