4  * SPDX-License-Identifier: Apache-2.0
25  * @brief Perform the bus transaction to start measurement.
28  * @param chan Channel ID for starting the measurement
33 	struct akm09918c_data *data = dev->data;  in akm09918c_start_measurement()
34 	const struct akm09918c_config *cfg = dev->config;  in akm09918c_start_measurement()
39 		return -EINVAL;  in akm09918c_start_measurement()
42 	if (data->mode == AKM09918C_CNTL2_PWR_DOWN) {  in akm09918c_start_measurement()
43 		if (i2c_reg_write_byte_dt(&cfg->i2c, AKM09918C_REG_CNTL2,  in akm09918c_start_measurement()
45 			LOG_ERR("Failed to start measurement.");  in akm09918c_start_measurement()
46 			return -EIO;  in akm09918c_start_measurement()
64 	const struct akm09918c_config *cfg = dev->config;  in akm09918c_fetch_measurement()
68 	if (i2c_burst_read_dt(&cfg->i2c, AKM09918C_REG_ST1, buf, ARRAY_SIZE(buf)) != 0) {  in akm09918c_fetch_measurement()
70 		return -EIO;  in akm09918c_fetch_measurement()
75 		return -EBUSY;  in akm09918c_fetch_measurement()
87 	struct akm09918c_data *data = dev->data;  in akm09918c_sample_fetch()
98 	return akm09918c_fetch_measurement(dev, &data->x_sample, &data->y_sample, &data->z_sample);  in akm09918c_sample_fetch()
105 	val->val1 = conv_val / 1000000;  in akm09918c_convert()
106 	val->val2 = conv_val - (val->val1 * 1000000);  in akm09918c_convert()
112 	struct akm09918c_data *data = dev->data;  in akm09918c_channel_get()
115 		akm09918c_convert(val, data->x_sample);  in akm09918c_channel_get()
116 		akm09918c_convert(val + 1, data->y_sample);  in akm09918c_channel_get()
117 		akm09918c_convert(val + 2, data->z_sample);  in akm09918c_channel_get()
119 		akm09918c_convert(val, data->x_sample);  in akm09918c_channel_get()
121 		akm09918c_convert(val, data->y_sample);  in akm09918c_channel_get()
123 		akm09918c_convert(val, data->z_sample);  in akm09918c_channel_get()
126 		return -ENOTSUP;  in akm09918c_channel_get()
135 	struct akm09918c_data *data = dev->data;  in akm09918c_attr_get()
144 			return -EINVAL;  in akm09918c_attr_get()
146 		akm09918c_reg_to_hz(data->mode, val);  in akm09918c_attr_get()
150 		return -EINVAL;  in akm09918c_attr_get()
158 	const struct akm09918c_config *cfg = dev->config;  in akm09918c_attr_set()
159 	struct akm09918c_data *data = dev->data;  in akm09918c_attr_set()
169 			return -EINVAL;  in akm09918c_attr_set()
172 		uint8_t mode = akm09918c_hz_to_reg(val);  in akm09918c_attr_set()  local
174 		res = i2c_reg_write_byte_dt(&cfg->i2c, AKM09918C_REG_CNTL2, mode);  in akm09918c_attr_set()
177 			return -EIO;  in akm09918c_attr_set()
179 		data->mode = mode;  in akm09918c_attr_set()
183 		return -EINVAL;  in akm09918c_attr_set()
196 		LOG_ERR("Failed to read who-am-i register (rc=%d)", rc);  in akm09918c_check_who_am_i()
197 		return -EIO;  in akm09918c_check_who_am_i()
201 		LOG_ERR("Wrong who-am-i value");  in akm09918c_check_who_am_i()
202 		return -EINVAL;  in akm09918c_check_who_am_i()
210 	const struct akm09918c_config *cfg = dev->config;  in akm09918c_init()
211 	struct akm09918c_data *data = dev->data;  in akm09918c_init()
214 	if (!i2c_is_ready_dt(&cfg->i2c)) {  in akm09918c_init()
216 		return -ENODEV;  in akm09918c_init()
220 	rc = i2c_reg_write_byte_dt(&cfg->i2c, AKM09918C_REG_CNTL3,  in akm09918c_init()
224 		return -EIO;  in akm09918c_init()
228 	rc = akm09918c_check_who_am_i(&cfg->i2c);  in akm09918c_init()
232 	data->mode = AKM09918C_CNTL2_PWR_DOWN;  in akm09918c_init()
234 	/* init work for fetching after measurement has completed */  in akm09918c_init()
235 	k_work_init_delayable(&data->work_ctx.async_fetch_work, akm09918_async_fetch);  in akm09918c_init()