4  * SPDX-License-Identifier: Apache-2.0
32 /* ADC sample time delay (Unit:us) */
38 #define ADC_CHANNEL_OFFSET(ch) ((ch)-CHIP_ADC_CH13-ADC_CHANNEL_SHIFT)
77 	 * The sample buffer pointer should be prepared
85  * this config will be used at initial time
98 	uint8_t channel_id = channel_cfg->channel_id;  in adc_it8xxx2_channel_setup()
100 	if (channel_cfg->acquisition_time != ADC_ACQ_TIME_DEFAULT) {  in adc_it8xxx2_channel_setup()
101 		LOG_ERR("Selected ADC acquisition time is not valid");  in adc_it8xxx2_channel_setup()
102 		return -EINVAL;  in adc_it8xxx2_channel_setup()
109 		return -EINVAL;  in adc_it8xxx2_channel_setup()
114 		channel_id -= ADC_CHANNEL_SHIFT;  in adc_it8xxx2_channel_setup()
117 	if (channel_cfg->gain != ADC_GAIN_1) {  in adc_it8xxx2_channel_setup()
119 		return -EINVAL;  in adc_it8xxx2_channel_setup()
122 	if (channel_cfg->reference != ADC_REF_INTERNAL) {  in adc_it8xxx2_channel_setup()
124 		return -EINVAL;  in adc_it8xxx2_channel_setup()
140 		adc_regs->VCH0CTL = IT8XXX2_ADC_DATVAL |  in adc_disable_measurement()
148 		adc_regs->adc_vchs_ctrl[ADC_CHANNEL_OFFSET(ch)].VCHCTL =  in adc_disable_measurement()
153 	adc_regs->ADCCFG &= ~IT8XXX2_ADC_ADCEN;  in adc_disable_measurement()
162 	struct adc_it8xxx2_data *data = dev->data;  in adc_data_valid()
164 	return (data->ch <= CHIP_ADC_CH7) ?  in adc_data_valid()
165 		(adc_regs->VCH0CTL & IT8XXX2_ADC_DATVAL) :  in adc_data_valid()
166 		(adc_regs->ADCDVSTS2 & BIT(ADC_CHANNEL_OFFSET(data->ch)));  in adc_data_valid()
172 	struct adc_it8xxx2_data *data = dev->data;  in adc_it8xxx2_get_sample()
176 		if (data->ch <= CHIP_ADC_CH7) {  in adc_it8xxx2_get_sample()
178 			*data->buffer++ = adc_regs->VCH0DATM << 8 |  in adc_it8xxx2_get_sample()
179 				adc_regs->VCH0DATL;  in adc_it8xxx2_get_sample()
182 			*data->buffer++ =  in adc_it8xxx2_get_sample()
183 				adc_regs->adc_vchs_ctrl[ADC_CHANNEL_OFFSET(data->ch)].VCHDATM << 8 |  in adc_it8xxx2_get_sample()
184 				adc_regs->adc_vchs_ctrl[ADC_CHANNEL_OFFSET(data->ch)].VCHDATL;  in adc_it8xxx2_get_sample()
188 			adc_regs->ADCDVSTS, data->ch);  in adc_it8xxx2_get_sample()
191 	adc_disable_measurement(data->ch);  in adc_it8xxx2_get_sample()
201 	 * the sampling time limit, the program will return.  in adc_poll_valid_data()
205 		/* Wait next clock time (1/32.768K~=30.5us) */  in adc_poll_valid_data()
226 	struct adc_it8xxx2_data *data = dev->data;  in adc_enable_measurement()
230 		adc_regs->VCH0CTL = (IT8XXX2_ADC_DATVAL | IT8XXX2_ADC_INTDVEN) + ch;  in adc_enable_measurement()
233 		adc_regs->adc_vchs_ctrl[ADC_CHANNEL_OFFSET(ch)].VCHCTL =  in adc_enable_measurement()
238 	adc_regs->ADCCFG |= IT8XXX2_ADC_ADCEN;  in adc_enable_measurement()
242 	 * at a time. The ADC sampling of it8xxx2 needs to read each channel  in adc_enable_measurement()
258 		k_sem_take(&data->sem, K_FOREVER);  in adc_enable_measurement()
268 	if (sequence->options) {  in check_buffer_size()
269 		needed_buffer_size *= (1 + sequence->options->extra_samplings);  in check_buffer_size()
272 	if (sequence->buffer_size < needed_buffer_size) {  in check_buffer_size()
274 				sequence->buffer_size, needed_buffer_size);  in check_buffer_size()
275 		return -ENOMEM;  in check_buffer_size()
284 	struct adc_it8xxx2_data *data = dev->data;  in adc_it8xxx2_start_read()
285 	uint32_t channel_mask = sequence->channels;  in adc_it8xxx2_start_read()
294 		return -EINVAL;  in adc_it8xxx2_start_read()
297 	if (!sequence->resolution) {  in adc_it8xxx2_start_read()
299 		return -EINVAL;  in adc_it8xxx2_start_read()
301 	LOG_DBG("Configure resolution=%d", sequence->resolution);  in adc_it8xxx2_start_read()
303 	data->buffer = sequence->buffer;  in adc_it8xxx2_start_read()
305 	adc_context_start_read(&data->ctx, sequence);  in adc_it8xxx2_start_read()
307 	return adc_context_wait_for_completion(&data->ctx);  in adc_it8xxx2_start_read()
314 	uint32_t channels = ctx->sequence.channels;  in adc_context_start_sampling()
317 	data->repeat_buffer = data->buffer;  in adc_context_start_sampling()
324 		data->ch = find_lsb_set(channels) - 1;  in adc_context_start_sampling()
325 		channels &= ~BIT(data->ch);  in adc_context_start_sampling()
327 		adc_enable_measurement(data->ch);  in adc_context_start_sampling()
332 	if (check_buffer_size(&ctx->sequence, channel_count)) {  in adc_context_start_sampling()
336 	adc_context_on_sampling_done(&data->ctx, DEVICE_DT_INST_GET(0));  in adc_context_start_sampling()
342 	struct adc_it8xxx2_data *data = dev->data;  in adc_it8xxx2_read()
345 	adc_context_lock(&data->ctx, false, NULL);  in adc_it8xxx2_read()
347 	adc_context_release(&data->ctx, err);  in adc_it8xxx2_read()
357 	struct adc_it8xxx2_data *data = dev->data;  in adc_it8xxx2_read_async()
360 	adc_context_lock(&data->ctx, true, async);  in adc_it8xxx2_read_async()
362 	adc_context_release(&data->ctx, err);  in adc_it8xxx2_read_async()
375 		data->buffer = data->repeat_buffer;  in adc_context_update_buffer_pointer()
381 	struct adc_it8xxx2_data *data = dev->data;  in adc_it8xxx2_isr()
387 	k_sem_give(&data->sem);  in adc_it8xxx2_isr()
412 	adc_regs->ADCSTS |= IT8XXX2_ADC_AINITB;  in adc_accuracy_initialization()
414 	adc_regs->KDCTL |= IT8XXX2_ADC_AHCE;  in adc_accuracy_initialization()
416 	adc_regs->ADCSTS &= ~IT8XXX2_ADC_AINITB;  in adc_accuracy_initialization()
421 	const struct adc_it8xxx2_cfg *config = dev->config;  in adc_it8xxx2_init()
422 	struct adc_it8xxx2_data *data = dev->data;  in adc_it8xxx2_init()
427 	/* ADC input voltage 0V ~ AVCC (3.3V) is mapped into 0h-3FFh */  in adc_it8xxx2_init()
428 	adc_regs->ADCIVMFSCS1 = ADC_0_7_FULL_SCALE_MASK;  in adc_it8xxx2_init()
429 	adc_regs->ADCIVMFSCS2 = ADC_8_10_FULL_SCALE_MASK;  in adc_it8xxx2_init()
430 	adc_regs->ADCIVMFSCS3 = ADC_13_16_FULL_SCALE_MASK;  in adc_it8xxx2_init()
436 	status = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);  in adc_it8xxx2_init()
443 	 * The ADC channel conversion time is 30.8*(SCLKDIV+1) us.  in adc_it8xxx2_init()
444 	 * (Current setting is 61.6us)  in adc_it8xxx2_init()
446 	 * NOTE: A sample time delay (60us) also need to be included in  in adc_it8xxx2_init()
447 	 * conversion time.  in adc_it8xxx2_init()
448 	 * In addition, the ADC has a waiting time of 202.8us for  in adc_it8xxx2_init()
451 	 * So the final ADC sample time result is ~= 324.4us.  in adc_it8xxx2_init()
453 	adc_regs->ADCSTS &= ~IT8XXX2_ADC_ADCCTS1;  in adc_it8xxx2_init()
454 	adc_regs->ADCCFG &= ~IT8XXX2_ADC_ADCCTS0;  in adc_it8xxx2_init()
456 	 * bit[5-0]@ADCCTL : SCLKDIV  in adc_it8xxx2_init()
459 	adc_regs->ADCCTL = 1;  in adc_it8xxx2_init()
462 	adc_regs->ADCCTL1 =  in adc_it8xxx2_init()
463 		(adc_regs->ADCCTL1 & ~ADC_SACLKDIV_MASK) | ADC_SACLKDIV(2);  in adc_it8xxx2_init()
469 	adc_regs->ADCGCR |= IT8XXX2_ADC_DBKEN;  in adc_it8xxx2_init()
474 	k_sem_init(&data->sem, 0, 1);  in adc_it8xxx2_init()
475 	adc_context_unlock_unconditionally(&data->ctx);  in adc_it8xxx2_init()