2  * Copyright (c) 2018-2019 Peter Bigot Consulting, LLC
3  * Copyright (c) 2019-2020 Nordic Semiconductor ASA
5  * SPDX-License-Identifier: Apache-2.0
27 /* This board uses a divider that reduces max voltage to
46 	 * the battery is measured through a voltage divider;
85 	const struct io_channel_config *iocp = &cfg->io_channel;  in divider_setup()
86 	const struct gpio_dt_spec *gcp = &cfg->power_gpios;  in divider_setup()
88 	struct adc_sequence *asp = &ddp->adc_seq;  in divider_setup()
89 	struct adc_channel_cfg *accp = &ddp->adc_cfg;  in divider_setup()
92 	if (!device_is_ready(ddp->adc)) {  in divider_setup()
93 		LOG_ERR("ADC device is not ready %s", ddp->adc->name);  in divider_setup()
94 		return -ENOENT;  in divider_setup()
97 	if (gcp->port) {  in divider_setup()
98 		if (!device_is_ready(gcp->port)) {  in divider_setup()
99 			LOG_ERR("%s: device not ready", gcp->port->name);  in divider_setup()
100 			return -ENOENT;  in divider_setup()
105 				gcp->port->name, gcp->pin, rc);  in divider_setup()
112 		.buffer = &ddp->raw,  in divider_setup()
113 		.buffer_size = sizeof(ddp->raw),  in divider_setup()
125 	if (cfg->output_ohm != 0) {  in divider_setup()
126 		accp->input_positive = SAADC_CH_PSELP_PSELP_AnalogInput0  in divider_setup()
127 			+ iocp->channel;  in divider_setup()
129 		accp->input_positive = SAADC_CH_PSELP_PSELP_VDD;  in divider_setup()
132 	asp->resolution = 14;  in divider_setup()
137 	rc = adc_channel_setup(ddp->adc, accp);  in divider_setup()
138 	LOG_INF("Setup AIN%u got %d", iocp->channel, rc);  in divider_setup()
158 	int rc = -ENOENT;  in battery_measure_enable()
164 		if (gcp->port) {  in battery_measure_enable()
173 	int rc = -ENOENT;  in battery_sample()
178 		struct adc_sequence *sp = &ddp->adc_seq;  in battery_sample()
180 		rc = adc_read(ddp->adc, sp);  in battery_sample()
181 		sp->calibrate = false;  in battery_sample()
183 			int32_t val = ddp->raw;  in battery_sample()  local
185 			adc_raw_to_millivolts(adc_ref_internal(ddp->adc),  in battery_sample()
186 					      ddp->adc_cfg.gain,  in battery_sample()
187 					      sp->resolution,  in battery_sample()
188 					      &val);  in battery_sample()
190 			if (dcp->output_ohm != 0) {  in battery_sample()
191 				rc = val * (uint64_t)dcp->full_ohm  in battery_sample()
192 					/ dcp->output_ohm;  in battery_sample()
194 					ddp->raw, val, rc);  in battery_sample()
196 				rc = val;  in battery_sample()
197 				LOG_INF("raw %u ~ %u mV\n", ddp->raw, val);  in battery_sample()
210 	if (batt_mV >= pb->lvl_mV) {  in battery_level_pptt()
212 		return pb->lvl_pptt;  in battery_level_pptt()
215 	while ((pb->lvl_pptt > 0)  in battery_level_pptt()
216 	       && (batt_mV < pb->lvl_mV)) {  in battery_level_pptt()
219 	if (batt_mV < pb->lvl_mV) {  in battery_level_pptt()
221 		return pb->lvl_pptt;  in battery_level_pptt()
225 	const struct battery_level_point *pa = pb - 1;  in battery_level_pptt()
227 	return pb->lvl_pptt  in battery_level_pptt()
228 	       + ((pa->lvl_pptt - pb->lvl_pptt)  in battery_level_pptt()
229 		  * (batt_mV - pb->lvl_mV)  in battery_level_pptt()
230 		  / (pa->lvl_mV - pb->lvl_mV));  in battery_level_pptt()