4  * SPDX-License-Identifier: Apache-2.0
14 #include <zephyr/dt-bindings/adc/b91-adc.h>
28 /* B91 ADC driver data */
46 /* Validate ADC data buffer size */
51 	if (sequence->options) {  in adc_b91_validate_buffer_size()
52 		needed *= (1 + sequence->options->extra_samplings);  in adc_b91_validate_buffer_size()
55 	if (sequence->buffer_size < needed) {  in adc_b91_validate_buffer_size()
56 		return -ENOMEM;  in adc_b91_validate_buffer_size()
67 	if (sequence->channels != BIT(0)) {  in adc_b91_validate_sequence()
69 		return -ENOTSUP;  in adc_b91_validate_sequence()
72 	if (sequence->oversampling) {  in adc_b91_validate_sequence()
74 		return -ENOTSUP;  in adc_b91_validate_sequence()
86 /* Convert dts pin to B91 SDK pin */
150 /* ADC Context API implementation: start sampling */
153 	struct b91_adc_data *data =  in adc_context_start_sampling()  local
156 	data->repeat_buffer = data->buffer;  in adc_context_start_sampling()
160 	k_sem_give(&data->acq_sem);  in adc_context_start_sampling()
166 	struct b91_adc_data *data =  in adc_context_update_buffer_pointer()  local
170 		data->buffer = data->repeat_buffer;  in adc_context_update_buffer_pointer()
174 /* Start ADC measurements */
178 	struct b91_adc_data *data = dev->data;  in adc_b91_adc_start_read()  local
187 	switch (sequence->resolution) {  in adc_b91_adc_start_read()
190 		data->resolution_divider = 1;  in adc_b91_adc_start_read()
194 		data->resolution_divider = 4;  in adc_b91_adc_start_read()
198 		data->resolution_divider = 16;  in adc_b91_adc_start_read()
202 		data->resolution_divider = 64;  in adc_b91_adc_start_read()
206 		return -EINVAL;  in adc_b91_adc_start_read()
210 	data->buffer = sequence->buffer;  in adc_b91_adc_start_read()
212 	/* Start ADC conversion */  in adc_b91_adc_start_read()
213 	adc_context_start_read(&data->ctx, sequence);  in adc_b91_adc_start_read()
215 	return adc_context_wait_for_completion(&data->ctx);  in adc_b91_adc_start_read()
226 	struct b91_adc_data *data = dev->data;  in adc_b91_acquisition_thread()  local
230 		k_sem_take(&data->acq_sem, K_FOREVER);  in adc_b91_acquisition_thread()
232 		/* Wait for ADC data ready */  in adc_b91_acquisition_thread()
238 		adc_code = (adc_b91_get_code() / data->resolution_divider);  in adc_b91_acquisition_thread()
239 		if (!data->differential) {  in adc_b91_acquisition_thread()
240 			/* Sign bit is not used in case of single-ended configuration */  in adc_b91_acquisition_thread()
243 			/* Do not return negative value for single-ended configuration */  in adc_b91_acquisition_thread()
248 		*data->buffer++ = adc_code;  in adc_b91_acquisition_thread()
254 		adc_context_on_sampling_done(&data->ctx, dev);  in adc_b91_acquisition_thread()
261 	struct b91_adc_data *data = dev->data;  in adc_b91_init()  local
263 	k_sem_init(&data->acq_sem, 0, 1);  in adc_b91_init()
265 	k_thread_create(&data->thread, data->stack,  in adc_b91_init()
272 	adc_context_unlock_unconditionally(&data->ctx);  in adc_b91_init()
287 	struct b91_adc_data *data = dev->data;  in adc_b91_channel_setup()  local
288 	const struct b91_adc_cfg *config = dev->config;  in adc_b91_channel_setup()
291 	if (channel_cfg->channel_id > 0) {  in adc_b91_channel_setup()
293 		return -EINVAL;  in adc_b91_channel_setup()
297 	if (channel_cfg->reference != ADC_REF_INTERNAL) {  in adc_b91_channel_setup()
299 		return -EINVAL;  in adc_b91_channel_setup()
303 	switch (config->vref_internal_mv) {  in adc_b91_channel_setup()
312 		return -EINVAL;  in adc_b91_channel_setup()
316 	switch (config->sample_freq) {  in adc_b91_channel_setup()
328 		return -EINVAL;  in adc_b91_channel_setup()
332 	switch (channel_cfg->gain) {  in adc_b91_channel_setup()
341 		return -EINVAL;  in adc_b91_channel_setup()
345 	switch (channel_cfg->acquisition_time) {  in adc_b91_channel_setup()
374 		return -EINVAL;  in adc_b91_channel_setup()
378 	input_positive = adc_b91_get_pin(channel_cfg->input_positive);  in adc_b91_channel_setup()
379 	input_negative = adc_b91_get_pin(channel_cfg->input_negative);  in adc_b91_channel_setup()
381 		channel_cfg->differential) {  in adc_b91_channel_setup()
382 		LOG_ERR("VBAT pin is not available for differential mode.");  in adc_b91_channel_setup()
383 		return -EINVAL;  in adc_b91_channel_setup()
384 	} else if (channel_cfg->differential && (input_negative == (uint8_t)NOINPUTN)) {  in adc_b91_channel_setup()
386 		return -EINVAL;  in adc_b91_channel_setup()
390 	data->differential = channel_cfg->differential;  in adc_b91_channel_setup()
396 	if (channel_cfg->differential) {  in adc_b91_channel_setup()
400 		adc_set_diff_input(channel_cfg->input_positive, channel_cfg->input_negative);  in adc_b91_channel_setup()
402 		/* Single-ended Vbat pin configuration */  in adc_b91_channel_setup()
405 		/* Single-ended GPIO pin configuration */  in adc_b91_channel_setup()
407 		adc_set_diff_input(channel_cfg->input_positive, GND);  in adc_b91_channel_setup()
418 	struct b91_adc_data *data = dev->data;  in adc_b91_read()  local
420 	adc_context_lock(&data->ctx, false, NULL);  in adc_b91_read()
422 	adc_context_release(&data->ctx, status);  in adc_b91_read()
434 	struct b91_adc_data *data = dev->data;  in adc_b91_read_async()  local
436 	adc_context_lock(&data->ctx, true, async);  in adc_b91_read_async()
438 	adc_context_release(&data->ctx, status);  in adc_b91_read_async()