| /* |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Würth Elektronic WSEN-ITDS 3-axis accel sensor driver |
| * |
| * Copyright (c) 2020 Linumiz |
| * Author: Saravanan Sekar <saravanan@linumiz.com> |
| */ |
| |
| #include <init.h> |
| #include <drivers/sensor.h> |
| #include <sys/byteorder.h> |
| #include <kernel.h> |
| #include <sys/__assert.h> |
| #include <logging/log.h> |
| #include "itds.h" |
| |
| #define DT_DRV_COMPAT we_wsen_itds |
| #define ITDS_TEMP_CONST 62500 |
| |
| LOG_MODULE_REGISTER(ITDS, CONFIG_SENSOR_LOG_LEVEL); |
| |
| static const struct itds_odr itds_odr_map[ITDS_ODR_MAX] = { |
| {0}, {1, 600}, {12, 500}, {25}, {50}, {100}, {200}, |
| {400}, {800}, {1600} |
| }; |
| |
| static const unsigned int itds_sensitivity_scale[][ITDS_ACCL_RANGE_END] = { |
| {976, 1952, 3904, 7808}, |
| |
| /* high performance mode */ |
| {244, 488, 976, 1952} |
| }; |
| |
| static int itds_get_odr_for_index(const struct device *dev, |
| enum itds_odr_const idx, |
| uint16_t *freq, uint16_t *mfreq) |
| { |
| struct itds_device_data *ddata = dev->data; |
| int start, end; |
| bool hp_mode; |
| |
| hp_mode = !!(ddata->op_mode & ITDS_OP_MODE_HIGH_PERF); |
| if (hp_mode) { |
| start = ITDS_ODR_12_5; |
| end = ITDS_ODR_1600; |
| } else { |
| start = ITDS_ODR_1_6; |
| end = ITDS_ODR_200; |
| } |
| |
| if (idx < start || idx > end) { |
| LOG_ERR("invalid odr for the operating mode"); |
| return -EINVAL; |
| } |
| |
| *freq = itds_odr_map[idx].freq; |
| *mfreq = itds_odr_map[idx].mfreq; |
| |
| return 0; |
| } |
| |
| static int itds_accl_odr_set(const struct device *dev, uint16_t freq, |
| uint16_t mfreq) |
| { |
| struct itds_device_data *ddata = dev->data; |
| const struct itds_device_config *cfg = dev->config; |
| int start, end, i; |
| bool hp_mode; |
| |
| hp_mode = !!(ddata->op_mode & ITDS_OP_MODE_HIGH_PERF); |
| if (hp_mode) { |
| start = ITDS_ODR_12_5; |
| end = ITDS_ODR_1600; |
| } else { |
| start = ITDS_ODR_1_6; |
| end = ITDS_ODR_200; |
| } |
| |
| for (i = start; i <= end; i++) { |
| if ((freq == itds_odr_map[i].freq) && |
| (mfreq == itds_odr_map[i].mfreq)) { |
| |
| return i2c_reg_update_byte(ddata->i2c, cfg->i2c_addr, |
| ITDS_REG_CTRL1, ITDS_MASK_ODR, i << 4); |
| } |
| } |
| |
| LOG_ERR("invalid odr, not in range"); |
| return -EINVAL; |
| } |
| |
| static int itds_accl_range_set(const struct device *dev, int32_t range) |
| { |
| struct itds_device_data *ddata = dev->data; |
| const struct itds_device_config *cfg = dev->config; |
| int i, ret; |
| bool hp_mode; |
| |
| for (i = 0; i < ITDS_ACCL_RANGE_END; i++) { |
| if (range <= (2 << i)) { |
| break; |
| } |
| } |
| |
| if (i == ITDS_ACCL_RANGE_END) { |
| LOG_ERR("Accl out of range"); |
| return -EINVAL; |
| } |
| |
| ret = i2c_reg_update_byte(ddata->i2c, cfg->i2c_addr, ITDS_REG_CTRL6, |
| ITDS_MASK_SCALE, i << 4); |
| if (ret) { |
| LOG_ERR("Accl set full scale failed %d", ret); |
| return ret; |
| } |
| |
| hp_mode = !!(ddata->op_mode & ITDS_OP_MODE_HIGH_PERF); |
| ddata->scale = itds_sensitivity_scale[hp_mode][i]; |
| |
| return 0; |
| } |
| |
| static int itds_attr_set(const struct device *dev, enum sensor_channel chan, |
| enum sensor_attribute attr, |
| const struct sensor_value *val) |
| { |
| if (chan != SENSOR_CHAN_ACCEL_X && |
| chan != SENSOR_CHAN_ACCEL_Y && |
| chan != SENSOR_CHAN_ACCEL_Z && |
| chan != SENSOR_CHAN_ACCEL_XYZ) { |
| LOG_ERR("attr_set() not supported on this channel."); |
| return -ENOTSUP; |
| } |
| |
| switch (attr) { |
| case SENSOR_ATTR_FULL_SCALE: |
| return itds_accl_range_set(dev, sensor_ms2_to_g(val)); |
| |
| case SENSOR_ATTR_SAMPLING_FREQUENCY: |
| return itds_accl_odr_set(dev, val->val1, val->val2 / 1000); |
| |
| default: |
| LOG_ERR("Accel attribute not supported."); |
| return -ENOTSUP; |
| } |
| } |
| |
| static int itds_fetch_temprature(struct itds_device_data *ddata, |
| const struct itds_device_config *cfg) |
| { |
| uint8_t rval; |
| int16_t temp_raw = 0; |
| int ret; |
| |
| ret = i2c_reg_read_byte(ddata->i2c, cfg->i2c_addr, |
| ITDS_REG_STATUS_DETECT, &rval); |
| if (ret) { |
| return ret; |
| } |
| |
| if (!(rval & ITDS_EVENT_DRDY_T)) { |
| return -EAGAIN; |
| } |
| |
| ret = i2c_burst_read(ddata->i2c, cfg->i2c_addr, ITDS_REG_TEMP_L, |
| (uint8_t *)&temp_raw, sizeof(uint16_t)); |
| if (ret) { |
| return ret; |
| } |
| |
| ddata->temprature = sys_le16_to_cpu(temp_raw); |
| |
| return 0; |
| } |
| |
| static int itds_fetch_accel(struct itds_device_data *ddata, |
| const struct itds_device_config *cfg) |
| { |
| size_t i, ret; |
| uint8_t rval; |
| |
| ret = i2c_reg_read_byte(ddata->i2c, cfg->i2c_addr, |
| ITDS_REG_STATUS, &rval); |
| if (ret) { |
| return ret; |
| } |
| |
| if (!(rval & ITDS_EVENT_DRDY)) { |
| return -EAGAIN; |
| } |
| |
| ret = i2c_burst_read(ddata->i2c, cfg->i2c_addr, ITDS_REG_X_OUT_L, |
| (uint8_t *)ddata->samples, |
| sizeof(uint16_t) * ITDS_SAMPLE_SIZE); |
| if (ret) { |
| return ret; |
| } |
| |
| /* convert samples to cpu endianness */ |
| for (i = 0; i < ITDS_SAMPLE_SIZE; i += 2) { |
| int16_t *sample = (int16_t *) &ddata->samples[i]; |
| |
| *sample = sys_le16_to_cpu(*sample); |
| if (ddata->op_mode & ITDS_OP_MODE_NORMAL || |
| ddata->op_mode & ITDS_OP_MODE_HIGH_PERF) { |
| *sample = *sample >> 2; |
| } else { |
| *sample = *sample >> 4; |
| } |
| LOG_DBG("itds sample %d %X\n", i, *sample); |
| } |
| |
| return 0; |
| } |
| |
| static int itds_sample_fetch(const struct device *dev, |
| enum sensor_channel chan) |
| { |
| struct itds_device_data *ddata = dev->data; |
| const struct itds_device_config *cfg = dev->config; |
| |
| switch (chan) { |
| case SENSOR_CHAN_ACCEL_XYZ: |
| case SENSOR_CHAN_ACCEL_X: |
| case SENSOR_CHAN_ACCEL_Y: |
| case SENSOR_CHAN_ACCEL_Z: |
| return itds_fetch_accel(ddata, cfg); |
| |
| case SENSOR_CHAN_DIE_TEMP: |
| return itds_fetch_temprature(ddata, cfg); |
| |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static inline void itds_accl_channel_get(const struct device *dev, |
| enum sensor_channel chan, |
| struct sensor_value *val) |
| { |
| int i; |
| struct itds_device_data *ddata = dev->data; |
| uint8_t ofs_start, ofs_stop; |
| |
| switch (chan) { |
| case SENSOR_CHAN_ACCEL_X: |
| ofs_start = ofs_stop = 0U; |
| break; |
| case SENSOR_CHAN_ACCEL_Y: |
| ofs_start = ofs_stop = 1U; |
| break; |
| case SENSOR_CHAN_ACCEL_Z: |
| ofs_start = ofs_stop = 2U; |
| break; |
| default: |
| ofs_start = 0U; ofs_stop = 2U; |
| break; |
| } |
| |
| for (i = ofs_start; i <= ofs_stop ; i++, val++) { |
| int64_t dval; |
| |
| /* Sensitivity is exposed in ug/LSB */ |
| /* Convert to m/s^2 */ |
| dval = (int64_t)((ddata->samples[i] * ddata->scale * SENSOR_G) / |
| 1000000LL); |
| val->val1 = (int32_t)(dval / 1000000); |
| val->val2 = (int32_t)(dval % 1000000); |
| } |
| } |
| |
| static int itds_temp_channel_get(const struct device *dev, |
| struct sensor_value *val) |
| { |
| int32_t temp_processed; |
| struct itds_device_data *ddata = dev->data; |
| |
| temp_processed = (ddata->temprature >> 4) * ITDS_TEMP_CONST; |
| |
| val->val1 = ITDS_TEMP_OFFSET; |
| val->val2 = temp_processed; |
| |
| return 0; |
| } |
| |
| static int itds_channel_get(const struct device *dev, |
| enum sensor_channel chan, |
| struct sensor_value *val) |
| { |
| switch (chan) { |
| case SENSOR_CHAN_ACCEL_X: |
| case SENSOR_CHAN_ACCEL_Y: |
| case SENSOR_CHAN_ACCEL_Z: |
| case SENSOR_CHAN_ACCEL_XYZ: |
| itds_accl_channel_get(dev, chan, val); |
| return 0; |
| |
| case SENSOR_CHAN_DIE_TEMP: |
| return itds_temp_channel_get(dev, val); |
| |
| default: |
| LOG_ERR("Channel not supported."); |
| return -ENOTSUP; |
| } |
| |
| return 0; |
| } |
| |
| static int itds_init(const struct device *dev) |
| { |
| struct itds_device_data *ddata = dev->data; |
| const struct itds_device_config *cfg = dev->config; |
| int ret; |
| uint16_t freq, mfreq; |
| uint8_t rval; |
| |
| ddata->i2c = device_get_binding(cfg->bus_name); |
| if (!ddata->i2c) { |
| LOG_ERR("I2C controller not found: %s.", cfg->bus_name); |
| return -EINVAL; |
| } |
| |
| ret = i2c_reg_read_byte(ddata->i2c, cfg->i2c_addr, |
| ITDS_REG_DEV_ID, &rval); |
| if (ret) { |
| LOG_ERR("device init fail: %d", ret); |
| return ret; |
| } |
| |
| if (rval != ITDS_DEVICE_ID) { |
| LOG_ERR("device ID mismatch: %x", rval); |
| return ret; |
| } |
| |
| ret = i2c_reg_update_byte(ddata->i2c, cfg->i2c_addr, ITDS_REG_CTRL2, |
| ITDS_MASK_BDU_INC_ADD, ITDS_MASK_BDU_INC_ADD); |
| if (ret) { |
| LOG_ERR("unable to set block data update %d", ret); |
| return ret; |
| } |
| |
| ret = i2c_reg_write_byte(ddata->i2c, cfg->i2c_addr, |
| ITDS_REG_WAKEUP_EVENT, 0); |
| if (ret) { |
| LOG_ERR("disable wakeup event fail %d", ret); |
| return ret; |
| } |
| |
| ret = i2c_reg_update_byte(ddata->i2c, cfg->i2c_addr, ITDS_REG_CTRL1, |
| ITDS_MASK_MODE, 1 << cfg->def_op_mode); |
| if (ret) { |
| LOG_ERR("set operating mode fail %d", ret); |
| return ret; |
| } |
| |
| ddata->op_mode = 1 << cfg->def_op_mode; |
| |
| ret = itds_get_odr_for_index(dev, cfg->def_odr, &freq, &mfreq); |
| if (ret) { |
| LOG_ERR("odr not in range for operating mode %d", ret); |
| return ret; |
| } |
| |
| ret = itds_accl_odr_set(dev, freq, mfreq); |
| if (ret) { |
| LOG_ERR("odr not in range for operating mode %d", ret); |
| return ret; |
| } |
| |
| #ifdef CONFIG_ITDS_TRIGGER |
| ret = itds_trigger_mode_init(dev); |
| if (ret) { |
| LOG_ERR("trigger mode init failed %d", ret); |
| return ret; |
| } |
| #endif |
| return 0; |
| } |
| |
| static const struct sensor_driver_api itds_api = { |
| .attr_set = itds_attr_set, |
| #ifdef CONFIG_ITDS_TRIGGER |
| .trigger_set = itds_trigger_set, |
| #endif |
| .sample_fetch = itds_sample_fetch, |
| .channel_get = itds_channel_get, |
| }; |
| |
| #define WSEN_ITDS_INIT(idx) \ |
| \ |
| static struct itds_device_data itds_data_##idx; \ |
| \ |
| static const struct itds_device_config itds_config_##idx = { \ |
| .i2c_addr = DT_INST_REG_ADDR(idx), \ |
| .bus_name = DT_INST_BUS_LABEL(idx), \ |
| .gpio_port = DT_INST_GPIO_LABEL(idx, int_gpios), \ |
| .int_pin = DT_INST_GPIO_PIN(idx, int_gpios), \ |
| .int_flags = DT_INST_GPIO_FLAGS(idx, int_gpios), \ |
| .def_odr = DT_ENUM_IDX(DT_DRV_INST(idx), odr), \ |
| .def_op_mode = DT_ENUM_IDX(DT_DRV_INST(idx), op_mode), \ |
| }; \ |
| \ |
| DEVICE_DT_INST_DEFINE(idx, itds_init, NULL, \ |
| &itds_data_##idx, &itds_config_##idx, \ |
| POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY, \ |
| &itds_api); \ |
| |
| DT_INST_FOREACH_STATUS_OKAY(WSEN_ITDS_INIT) |