1 // SPDX-License-Identifier: GPL-2.0
26 #include <dt-bindings/iio/addac/adi,ad74413r.h>
63 	 * Synchronize consecutive operations when doing a one-shot
172 	ad74413r_format_reg_write(reg, val, st->reg_tx_buf);  in ad74413r_reg_write()
174 	return spi_write(st->spi, st->reg_tx_buf, AD74413R_FRAME_SIZE);  in ad74413r_reg_write()
182 		dev_err(st->dev, "Bad CRC %02x for %02x%02x%02x\n",  in ad74413r_crc_check()
184 		return -EINVAL;  in ad74413r_crc_check()
195 			.tx_buf = st->reg_tx_buf,  in ad74413r_reg_read()
200 			.rx_buf = st->reg_rx_buf,  in ad74413r_reg_read()
207 				  st->reg_tx_buf);  in ad74413r_reg_read()
209 	ret = spi_sync_transfer(st->spi, reg_read_xfer,  in ad74413r_reg_read()
214 	ret = ad74413r_crc_check(st, st->reg_rx_buf);  in ad74413r_reg_read()
218 	*val = get_unaligned_be16(&st->reg_rx_buf[1]);  in ad74413r_reg_read()
233 	return regmap_update_bits(st->regmap, AD74413R_REG_GPO_CONFIG_X(offset),  in ad74413r_set_gpo_config()
248 	unsigned int val = AD74413R_DIN_DEBOUNCE_LEN - 1;  in ad74413r_set_comp_debounce()
257 	return regmap_update_bits(st->regmap,  in ad74413r_set_comp_debounce()
267 	unsigned int real_offset = st->gpo_gpio_offsets[offset];  in ad74413r_gpio_set()
275 	regmap_update_bits(st->regmap, AD74413R_REG_GPO_CONFIG_X(real_offset),  in ad74413r_gpio_set()
290 	for_each_set_bit(offset, mask, chip->ngpio) {  in ad74413r_gpio_set_multiple()
291 		unsigned int real_offset = st->gpo_gpio_offsets[offset];  in ad74413r_gpio_set_multiple()
303 	regmap_update_bits(st->regmap, AD74413R_REG_GPO_PAR_DATA,  in ad74413r_gpio_set_multiple()
310 	unsigned int real_offset = st->comp_gpio_offsets[offset];  in ad74413r_gpio_get()
314 	ret = regmap_read(st->regmap, AD74413R_REG_DIN_COMP_OUT, &status);  in ad74413r_gpio_get()
332 	ret = regmap_read(st->regmap, AD74413R_REG_DIN_COMP_OUT, &val);  in ad74413r_gpio_get_multiple()
336 	for_each_set_bit(offset, mask, chip->ngpio) {  in ad74413r_gpio_get_multiple()
337 		unsigned int real_offset = st->comp_gpio_offsets[offset];  in ad74413r_gpio_get_multiple()
362 	unsigned int real_offset = st->gpo_gpio_offsets[offset];  in ad74413r_gpio_set_gpo_config()
372 		return -ENOTSUPP;  in ad74413r_gpio_set_gpo_config()
381 	unsigned int real_offset = st->comp_gpio_offsets[offset];  in ad74413r_gpio_set_comp_config()
388 		return -ENOTSUPP;  in ad74413r_gpio_set_comp_config()
396 	ret = regmap_write(st->regmap, AD74413R_REG_CMD_KEY,  in ad74413r_reset()
401 	return regmap_write(st->regmap, AD74413R_REG_CMD_KEY,  in ad74413r_reset()
413 	return regmap_multi_reg_write(st->regmap, reg_seq, 2);  in ad74413r_set_channel_dac_code()
419 	return regmap_update_bits(st->regmap,  in ad74413r_set_channel_function()
433 	ret = regmap_write_bits(st->regmap, AD74413R_REG_ADC_CONV_CTRL,  in ad74413r_set_adc_conv_seq()
451 	return regmap_update_bits(st->regmap, AD74413R_REG_ADC_CONV_CTRL,  in ad74413r_set_adc_channel_enable()
462 	ret = regmap_read(st->regmap, AD74413R_REG_ADC_CONFIG_X(channel), val);  in ad74413r_get_adc_range()
477 	ret = regmap_read(st->regmap, AD74413R_REG_ADC_CONFIG_X(channel), val);  in ad74413r_get_adc_rejection()
490 	return regmap_update_bits(st->regmap,  in ad74413r_set_adc_rejection()
514 		dev_err(st->dev, "ADC rejection invalid\n");  in ad74413r_rejection_to_rate()
515 		return -EINVAL;  in ad74413r_rejection_to_rate()
536 		dev_err(st->dev, "ADC rate invalid\n");  in ad74413r_rate_to_rejection()
537 		return -EINVAL;  in ad74413r_rate_to_rejection()
556 		dev_err(st->dev, "ADC range invalid\n");  in ad74413r_range_to_voltage_range()
557 		return -EINVAL;  in ad74413r_range_to_voltage_range()
571 		*val = -2500;  in ad74413r_range_to_voltage_offset()
574 		dev_err(st->dev, "ADC range invalid\n");  in ad74413r_range_to_voltage_offset()
575 		return -EINVAL;  in ad74413r_range_to_voltage_offset()
588 		*val = -((int)AD74413R_ADC_RESULT_MAX);  in ad74413r_range_to_voltage_offset_raw()
591 		*val = -((int)AD74413R_ADC_RESULT_MAX / 2);  in ad74413r_range_to_voltage_offset_raw()
594 		dev_err(st->dev, "ADC range invalid\n");  in ad74413r_range_to_voltage_offset_raw()
595 		return -EINVAL;  in ad74413r_range_to_voltage_offset_raw()
611 	*val = regulator_get_voltage(st->refin_reg);  in ad74413r_get_output_current_scale()
612 	*val2 = st->sense_resistor_ohms * AD74413R_DAC_CODE_MAX * 1000;  in ad74413r_get_output_current_scale()
669 	*val2 = AD74413R_ADC_RESULT_MAX * st->sense_resistor_ohms;  in ad74413r_get_input_current_scale()
732 	struct iio_dev *indio_dev = pf->indio_dev;  in ad74413r_trigger_handler()
734 	u8 *rx_buf = st->adc_samples_buf.rx_buf;  in ad74413r_trigger_handler()
738 	ret = spi_sync(st->spi, &st->adc_samples_msg);  in ad74413r_trigger_handler()
742 	for (i = 0; i < st->adc_active_channels; i++)  in ad74413r_trigger_handler()
745 	iio_push_to_buffers_with_timestamp(indio_dev, &st->adc_samples_buf,  in ad74413r_trigger_handler()
749 	iio_trigger_notify_done(indio_dev->trig);  in ad74413r_trigger_handler()
760 		iio_trigger_poll(st->trig);  in ad74413r_adc_data_interrupt()
762 		complete(&st->adc_data_completion);  in ad74413r_adc_data_interrupt()
773 	reinit_completion(&st->adc_data_completion);  in _ad74413r_get_single_adc_result()
783 	ret = wait_for_completion_timeout(&st->adc_data_completion,  in _ad74413r_get_single_adc_result()
786 		ret = -ETIMEDOUT;  in _ad74413r_get_single_adc_result()
790 	ret = regmap_read(st->regmap, AD74413R_REG_ADC_RESULT_X(channel),  in _ad74413r_get_single_adc_result()
818 	mutex_lock(&st->lock);  in ad74413r_get_single_adc_result()
820 	mutex_unlock(&st->lock);  in ad74413r_get_single_adc_result()
830 		adc_result = AD74413R_ADC_RESULT_MAX - 1;  in ad74413r_adc_to_resistance_result()
833 				 AD74413R_ADC_RESULT_MAX - adc_result);  in ad74413r_adc_to_resistance_result()
840 	struct spi_transfer *xfer = st->adc_samples_xfer;  in ad74413r_update_scan_mode()
841 	u8 *rx_buf = st->adc_samples_buf.rx_buf;  in ad74413r_update_scan_mode()
842 	u8 *tx_buf = st->adc_samples_tx_buf;  in ad74413r_update_scan_mode()
844 	int ret = -EINVAL;  in ad74413r_update_scan_mode()
846 	mutex_lock(&st->lock);  in ad74413r_update_scan_mode()
848 	spi_message_init(&st->adc_samples_msg);  in ad74413r_update_scan_mode()
849 	st->adc_active_channels = 0;  in ad74413r_update_scan_mode()
878 		st->adc_active_channels++;  in ad74413r_update_scan_mode()
880 		if (xfer == st->adc_samples_xfer)  in ad74413r_update_scan_mode()
881 			xfer->rx_buf = NULL;  in ad74413r_update_scan_mode()
883 			xfer->rx_buf = rx_buf;  in ad74413r_update_scan_mode()
885 		xfer->tx_buf = tx_buf;  in ad74413r_update_scan_mode()
886 		xfer->len = AD74413R_FRAME_SIZE;  in ad74413r_update_scan_mode()
887 		xfer->cs_change = 1;  in ad74413r_update_scan_mode()
893 		spi_message_add_tail(xfer, &st->adc_samples_msg);  in ad74413r_update_scan_mode()
896 		if (xfer != st->adc_samples_xfer)  in ad74413r_update_scan_mode()
901 	xfer->rx_buf = rx_buf;  in ad74413r_update_scan_mode()
902 	xfer->tx_buf = NULL;  in ad74413r_update_scan_mode()
903 	xfer->len = AD74413R_FRAME_SIZE;  in ad74413r_update_scan_mode()
904 	xfer->cs_change = 0;  in ad74413r_update_scan_mode()
906 	spi_message_add_tail(xfer, &st->adc_samples_msg);  in ad74413r_update_scan_mode()
909 	mutex_unlock(&st->lock);  in ad74413r_update_scan_mode()
936 		switch (chan->type) {  in ad74413r_read_raw()
938 			if (chan->output)  in ad74413r_read_raw()
943 					chan->channel, val, val2);  in ad74413r_read_raw()
945 			if (chan->output)  in ad74413r_read_raw()
950 					chan->channel, val, val2);  in ad74413r_read_raw()
952 			return -EINVAL;  in ad74413r_read_raw()
955 		switch (chan->type) {  in ad74413r_read_raw()
958 				chan->channel, val);  in ad74413r_read_raw()
961 				chan->channel, val);  in ad74413r_read_raw()
963 			return -EINVAL;  in ad74413r_read_raw()
966 		if (chan->output)  in ad74413r_read_raw()
967 			return -EINVAL;  in ad74413r_read_raw()
969 		return ad74413r_get_single_adc_result(indio_dev, chan->channel,  in ad74413r_read_raw()
974 		ret = ad74413r_get_single_adc_result(indio_dev, chan->channel,  in ad74413r_read_raw()
984 		return ad74413r_get_adc_rate(st, chan->channel, val);  in ad74413r_read_raw()
986 		return -EINVAL;  in ad74413r_read_raw()
998 		if (!chan->output)  in ad74413r_write_raw()
999 			return -EINVAL;  in ad74413r_write_raw()
1002 			dev_err(st->dev, "Invalid DAC code\n");  in ad74413r_write_raw()
1003 			return -EINVAL;  in ad74413r_write_raw()
1006 		return ad74413r_set_channel_dac_code(st, chan->channel, val);  in ad74413r_write_raw()
1008 		return ad74413r_set_adc_rate(st, chan->channel, val);  in ad74413r_write_raw()
1010 		return -EINVAL;  in ad74413r_write_raw()
1023 		if (st->chip_info->hart_support) {  in ad74413r_read_avail()
1033 		return -EINVAL;  in ad74413r_read_avail()
1148 		dev_err(st->dev, "Failed to read channel reg: %d\n", ret);  in ad74413r_parse_channel_config()
1153 		dev_err(st->dev, "Channel index %u is too large\n", index);  in ad74413r_parse_channel_config()
1154 		return -EINVAL;  in ad74413r_parse_channel_config()
1157 	config = &st->channel_configs[index];  in ad74413r_parse_channel_config()
1158 	if (config->initialized) {  in ad74413r_parse_channel_config()
1159 		dev_err(st->dev, "Channel %u already initialized\n", index);  in ad74413r_parse_channel_config()
1160 		return -EINVAL;  in ad74413r_parse_channel_config()
1163 	config->func = CH_FUNC_HIGH_IMPEDANCE;  in ad74413r_parse_channel_config()
1164 	fwnode_property_read_u32(channel_node, "adi,ch-func", &config->func);  in ad74413r_parse_channel_config()
1166 	if (config->func < CH_FUNC_MIN || config->func > CH_FUNC_MAX) {  in ad74413r_parse_channel_config()
1167 		dev_err(st->dev, "Invalid channel function %u\n", config->func);  in ad74413r_parse_channel_config()
1168 		return -EINVAL;  in ad74413r_parse_channel_config()
1171 	if (!st->chip_info->hart_support &&  in ad74413r_parse_channel_config()
1172 	    (config->func == CH_FUNC_CURRENT_INPUT_EXT_POWER_HART ||  in ad74413r_parse_channel_config()
1173 	     config->func == CH_FUNC_CURRENT_INPUT_LOOP_POWER_HART)) {  in ad74413r_parse_channel_config()
1174 		dev_err(st->dev, "Unsupported HART function %u\n", config->func);  in ad74413r_parse_channel_config()
1175 		return -EINVAL;  in ad74413r_parse_channel_config()
1178 	if (config->func == CH_FUNC_DIGITAL_INPUT_LOGIC ||  in ad74413r_parse_channel_config()
1179 	    config->func == CH_FUNC_DIGITAL_INPUT_LOOP_POWER)  in ad74413r_parse_channel_config()
1180 		st->num_comparator_gpios++;  in ad74413r_parse_channel_config()
1182 	config->gpo_comparator = fwnode_property_read_bool(channel_node,  in ad74413r_parse_channel_config()
1183 		"adi,gpo-comparator");  in ad74413r_parse_channel_config()
1185 	if (!config->gpo_comparator)  in ad74413r_parse_channel_config()
1186 		st->num_gpo_gpios++;  in ad74413r_parse_channel_config()
1188 	indio_dev->num_channels += ad74413r_channels_map[config->func].num_channels;  in ad74413r_parse_channel_config()
1190 	config->initialized = true;  in ad74413r_parse_channel_config()
1201 	fwnode_for_each_available_child_node(dev_fwnode(st->dev), channel_node) {  in ad74413r_parse_channel_configs()
1223 	channels = devm_kcalloc(st->dev, sizeof(*channels),  in ad74413r_setup_channels()
1224 				indio_dev->num_channels, GFP_KERNEL);  in ad74413r_setup_channels()
1226 		return -ENOMEM;  in ad74413r_setup_channels()
1228 	indio_dev->channels = channels;  in ad74413r_setup_channels()
1231 		config = &st->channel_configs[i];  in ad74413r_setup_channels()
1232 		chans = ad74413r_channels_map[config->func].channels;  in ad74413r_setup_channels()
1233 		num_chans = ad74413r_channels_map[config->func].num_channels;  in ad74413r_setup_channels()
1240 			chan->channel = i;  in ad74413r_setup_channels()
1241 			if (chan->output)  in ad74413r_setup_channels()
1242 				chan->scan_index = -1;  in ad74413r_setup_channels()
1244 				chan->scan_index = i;  in ad74413r_setup_channels()
1247 		ret = ad74413r_set_channel_function(st, i, config->func);  in ad74413r_setup_channels()
1267 		config = &st->channel_configs[i];  in ad74413r_setup_gpios()
1269 		if (config->gpo_comparator) {  in ad74413r_setup_gpios()
1273 			st->gpo_gpio_offsets[gpo_gpio_i++] = i;  in ad74413r_setup_gpios()
1276 		if (config->func == CH_FUNC_DIGITAL_INPUT_LOGIC ||  in ad74413r_setup_gpios()
1277 		    config->func == CH_FUNC_DIGITAL_INPUT_LOOP_POWER)  in ad74413r_setup_gpios()
1278 			st->comp_gpio_offsets[comp_gpio_i++] = i;  in ad74413r_setup_gpios()
1299 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad74413r_probe()
1301 		return -ENOMEM;  in ad74413r_probe()
1305 	st->spi = spi;  in ad74413r_probe()
1306 	st->dev = &spi->dev;  in ad74413r_probe()
1307 	st->chip_info = device_get_match_data(&spi->dev);  in ad74413r_probe()
1308 	mutex_init(&st->lock);  in ad74413r_probe()
1309 	init_completion(&st->adc_data_completion);  in ad74413r_probe()
1311 	st->regmap = devm_regmap_init(st->dev, NULL, st,  in ad74413r_probe()
1313 	if (IS_ERR(st->regmap))  in ad74413r_probe()
1314 		return PTR_ERR(st->regmap);  in ad74413r_probe()
1316 	st->refin_reg = devm_regulator_get(st->dev, "refin");  in ad74413r_probe()
1317 	if (IS_ERR(st->refin_reg))  in ad74413r_probe()
1318 		return dev_err_probe(st->dev, PTR_ERR(st->refin_reg),  in ad74413r_probe()
1321 	ret = regulator_enable(st->refin_reg);  in ad74413r_probe()
1325 	ret = devm_add_action_or_reset(st->dev, ad74413r_regulator_disable,  in ad74413r_probe()
1326 				       st->refin_reg);  in ad74413r_probe()
1330 	st->sense_resistor_ohms = 100000000;  in ad74413r_probe()
1331 	device_property_read_u32(st->dev, "shunt-resistor-micro-ohms",  in ad74413r_probe()
1332 				 &st->sense_resistor_ohms);  in ad74413r_probe()
1333 	st->sense_resistor_ohms /= 1000000;  in ad74413r_probe()
1335 	st->trig = devm_iio_trigger_alloc(st->dev, "%s-dev%d",  in ad74413r_probe()
1336 					  st->chip_info->name, iio_device_id(indio_dev));  in ad74413r_probe()
1337 	if (!st->trig)  in ad74413r_probe()
1338 		return -ENOMEM;  in ad74413r_probe()
1340 	st->trig->ops = &ad74413r_trigger_ops;  in ad74413r_probe()
1341 	iio_trigger_set_drvdata(st->trig, st);  in ad74413r_probe()
1343 	ret = devm_iio_trigger_register(st->dev, st->trig);  in ad74413r_probe()
1347 	indio_dev->name = st->chip_info->name;  in ad74413r_probe()
1348 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad74413r_probe()
1349 	indio_dev->info = &ad74413r_info;  in ad74413r_probe()
1350 	indio_dev->trig = iio_trigger_get(st->trig);  in ad74413r_probe()
1368 	if (st->num_gpo_gpios) {  in ad74413r_probe()
1369 		st->gpo_gpiochip.owner = THIS_MODULE;  in ad74413r_probe()
1370 		st->gpo_gpiochip.label = st->chip_info->name;  in ad74413r_probe()
1371 		st->gpo_gpiochip.base = -1;  in ad74413r_probe()
1372 		st->gpo_gpiochip.ngpio = st->num_gpo_gpios;  in ad74413r_probe()
1373 		st->gpo_gpiochip.parent = st->dev;  in ad74413r_probe()
1374 		st->gpo_gpiochip.can_sleep = true;  in ad74413r_probe()
1375 		st->gpo_gpiochip.set = ad74413r_gpio_set;  in ad74413r_probe()
1376 		st->gpo_gpiochip.set_multiple = ad74413r_gpio_set_multiple;  in ad74413r_probe()
1377 		st->gpo_gpiochip.set_config = ad74413r_gpio_set_gpo_config;  in ad74413r_probe()
1378 		st->gpo_gpiochip.get_direction =  in ad74413r_probe()
1381 		ret = devm_gpiochip_add_data(st->dev, &st->gpo_gpiochip, st);  in ad74413r_probe()
1386 	if (st->num_comparator_gpios) {  in ad74413r_probe()
1387 		st->comp_gpiochip.owner = THIS_MODULE;  in ad74413r_probe()
1388 		st->comp_gpiochip.label = st->chip_info->name;  in ad74413r_probe()
1389 		st->comp_gpiochip.base = -1;  in ad74413r_probe()
1390 		st->comp_gpiochip.ngpio = st->num_comparator_gpios;  in ad74413r_probe()
1391 		st->comp_gpiochip.parent = st->dev;  in ad74413r_probe()
1392 		st->comp_gpiochip.can_sleep = true;  in ad74413r_probe()
1393 		st->comp_gpiochip.get = ad74413r_gpio_get;  in ad74413r_probe()
1394 		st->comp_gpiochip.get_multiple = ad74413r_gpio_get_multiple;  in ad74413r_probe()
1395 		st->comp_gpiochip.set_config = ad74413r_gpio_set_comp_config;  in ad74413r_probe()
1396 		st->comp_gpiochip.get_direction =  in ad74413r_probe()
1399 		ret = devm_gpiochip_add_data(st->dev, &st->comp_gpiochip, st);  in ad74413r_probe()
1408 	ret = devm_request_irq(st->dev, spi->irq, ad74413r_adc_data_interrupt,  in ad74413r_probe()
1409 			       0, st->chip_info->name, indio_dev);  in ad74413r_probe()
1411 		return dev_err_probe(st->dev, ret, "Failed to request irq\n");  in ad74413r_probe()
1413 	ret = devm_iio_triggered_buffer_setup(st->dev, indio_dev,  in ad74413r_probe()
1420 	return devm_iio_device_register(st->dev, indio_dev);  in ad74413r_probe()