1 // SPDX-License-Identifier: GPL-2.0-only
11 #include <linux/delay.h>
41 /* Config register */
82 /* Timeout based on the minimum sample rate of 20 SPS (50000us) */
91 	int mux;  member
121 	unsigned int config = st->cached_config;  in ads1119_upd_cfg_reg()  local
124 	config &= ~fields;  in ads1119_upd_cfg_reg()
125 	config |= val;  in ads1119_upd_cfg_reg()
127 	ret = i2c_smbus_write_byte_data(st->client, ADS1119_CMD_WREG, config);  in ads1119_upd_cfg_reg()
131 	st->cached_config = config;  in ads1119_upd_cfg_reg()
140 	status = i2c_smbus_read_byte_data(st->client, ADS1119_CMD_RREG_STATUS);  in ads1119_data_ready()
149 	st->cached_config = 0;  in ads1119_reset()
151 	if (!st->reset_gpio)  in ads1119_reset()
152 		return i2c_smbus_write_byte(st->client, ADS1119_CMD_RESET);  in ads1119_reset()
154 	gpiod_set_value_cansleep(st->reset_gpio, 1);  in ads1119_reset()
156 	gpiod_set_value_cansleep(st->reset_gpio, 0);  in ads1119_reset()
198 static int ads1119_configure_channel(struct ads1119_state *st, int mux,  in ads1119_configure_channel()  argument
204 				  FIELD_PREP(ADS1119_CONFIG_MUX_FIELD, mux));  in ads1119_configure_channel()
222 	unsigned int datarate = st->channels_cfg[chan->address].datarate;  in ads1119_poll_data_ready()
243 	if (!st->client->irq) {  in ads1119_read_data()
247 	} else if (!wait_for_completion_timeout(&st->completion, timeout)) {  in ads1119_read_data()
248 		return -ETIMEDOUT;  in ads1119_read_data()
251 	ret = i2c_smbus_read_word_swapped(st->client, ADS1119_CMD_RDATA);  in ads1119_read_data()
265 	struct device *dev = &st->client->dev;  in ads1119_single_conversion()
266 	int mux = st->channels_cfg[chan->address].mux;  in ads1119_single_conversion()  local
267 	int gain = st->channels_cfg[chan->address].gain;  in ads1119_single_conversion()
268 	int datarate = st->channels_cfg[chan->address].datarate;  in ads1119_single_conversion()
273 		mux = ADS1119_MUX_SHORTED;  in ads1119_single_conversion()
279 	ret = ads1119_configure_channel(st, mux, gain, datarate);  in ads1119_single_conversion()
283 	ret = i2c_smbus_write_byte(st->client, ADS1119_CMD_START_SYNC);  in ads1119_single_conversion()
291 	*val = sign_extend32(sample, chan->scan_type.realbits - 1);  in ads1119_single_conversion()
308 		return -EINVAL;  in ads1119_validate_datarate()
329 		return -EINVAL;  in ads1119_read_avail()
338 	unsigned int index = chan->address;  in ads1119_read_raw()
340 	if (index >= st->num_channels_cfg)  in ads1119_read_raw()
341 		return -EINVAL;  in ads1119_read_raw()
345 		iio_device_claim_direct_scoped(return -EBUSY, indio_dev)  in ads1119_read_raw()
349 		iio_device_claim_direct_scoped(return -EBUSY, indio_dev)  in ads1119_read_raw()
353 		*val = st->vref_uV / 1000;  in ads1119_read_raw()
354 		*val /= st->channels_cfg[index].gain;  in ads1119_read_raw()
355 		*val2 = chan->scan_type.realbits - 1;  in ads1119_read_raw()
358 		*val = st->channels_cfg[index].datarate;  in ads1119_read_raw()
361 		return -EINVAL;  in ads1119_read_raw()
370 	unsigned int index = chan->address;  in ads1119_write_raw()
373 	if (index >= st->num_channels_cfg)  in ads1119_write_raw()
374 		return -EINVAL;  in ads1119_write_raw()
380 			return -EINVAL;  in ads1119_write_raw()
382 		st->channels_cfg[index].gain = ret;  in ads1119_write_raw()
389 		st->channels_cfg[index].datarate = ret;  in ads1119_write_raw()
392 		return -EINVAL;  in ads1119_write_raw()
404 		return -EINVAL;  in ads1119_debugfs_reg_access()
407 		ret = i2c_smbus_read_byte_data(st->client,  in ads1119_debugfs_reg_access()
417 		return -EINVAL;  in ads1119_debugfs_reg_access()
419 	return i2c_smbus_write_byte_data(st->client, ADS1119_CMD_WREG,  in ads1119_debugfs_reg_access()
433 	struct device *dev = &st->client->dev;  in ads1119_triggered_buffer_preenable()
437 	index = find_first_bit(indio_dev->active_scan_mask,  in ads1119_triggered_buffer_preenable()
445 					st->channels_cfg[index].mux,  in ads1119_triggered_buffer_preenable()
446 					st->channels_cfg[index].gain,  in ads1119_triggered_buffer_preenable()
447 					st->channels_cfg[index].datarate);  in ads1119_triggered_buffer_preenable()
455 	return i2c_smbus_write_byte(st->client, ADS1119_CMD_START_SYNC);  in ads1119_triggered_buffer_preenable()
461 	struct device *dev = &st->client->dev;  in ads1119_triggered_buffer_postdisable()
490 		iio_trigger_poll(indio_dev->trig);  in ads1119_irq_handler()
492 		complete(&st->completion);  in ads1119_irq_handler()
500 	struct iio_dev *indio_dev = pf->indio_dev;  in ads1119_trigger_handler()
510 		index = find_first_bit(indio_dev->active_scan_mask,  in ads1119_trigger_handler()
513 		ret = ads1119_poll_data_ready(st, &indio_dev->channels[index]);  in ads1119_trigger_handler()
515 			dev_err(&st->client->dev,  in ads1119_trigger_handler()
521 	ret = i2c_smbus_read_word_swapped(st->client, ADS1119_CMD_RDATA);  in ads1119_trigger_handler()
523 		dev_err(&st->client->dev,  in ads1119_trigger_handler()
533 	iio_trigger_notify_done(indio_dev->trig);  in ads1119_trigger_handler()
557 		return -EINVAL;  in ads1119_map_analog_inputs_mux()
569 	return -EINVAL;  in ads1119_map_analog_inputs_mux()
595 	struct device *dev = &st->client->dev;  in ads1119_alloc_and_config_channels()
601 	st->num_channels_cfg = device_get_child_node_count(dev);  in ads1119_alloc_and_config_channels()
602 	if (st->num_channels_cfg > ADS1119_MAX_CHANNELS)  in ads1119_alloc_and_config_channels()
603 		return dev_err_probe(dev, -EINVAL,  in ads1119_alloc_and_config_channels()
605 				     st->num_channels_cfg,  in ads1119_alloc_and_config_channels()
608 	st->channels_cfg = devm_kcalloc(dev, st->num_channels_cfg,  in ads1119_alloc_and_config_channels()
609 					sizeof(*st->channels_cfg), GFP_KERNEL);  in ads1119_alloc_and_config_channels()
610 	if (!st->channels_cfg)  in ads1119_alloc_and_config_channels()
611 		return -ENOMEM;  in ads1119_alloc_and_config_channels()
614 	num_channels = st->num_channels_cfg + 1;  in ads1119_alloc_and_config_channels()
618 		return -ENOMEM;  in ads1119_alloc_and_config_channels()
625 		differential = fwnode_property_present(child, "diff-channels");  in ads1119_alloc_and_config_channels()
628 							     "diff-channels",  in ads1119_alloc_and_config_channels()
631 			ret = fwnode_property_read_u32(child, "single-channel",  in ads1119_alloc_and_config_channels()
644 		st->channels_cfg[i].mux = ret;  in ads1119_alloc_and_config_channels()
645 		st->channels_cfg[i].gain = ADS1119_DEFAULT_GAIN;  in ads1119_alloc_and_config_channels()
646 		st->channels_cfg[i].datarate = ADS1119_DEFAULT_DATARATE;  in ads1119_alloc_and_config_channels()
649 		chan->channel = ain[0];  in ads1119_alloc_and_config_channels()
650 		chan->address = i;  in ads1119_alloc_and_config_channels()
651 		chan->scan_index = i;  in ads1119_alloc_and_config_channels()
654 			chan->channel2 = ain[1];  in ads1119_alloc_and_config_channels()
655 			chan->differential = 1;  in ads1119_alloc_and_config_channels()
658 		dev_dbg(dev, "channel: index %d, mux %d\n", i,  in ads1119_alloc_and_config_channels()
659 			st->channels_cfg[i].mux);  in ads1119_alloc_and_config_channels()
668 	indio_dev->channels = iio_channels;  in ads1119_alloc_and_config_channels()
669 	indio_dev->num_channels = num_channels;  in ads1119_alloc_and_config_channels()
678 	i2c_smbus_write_byte(st->client, ADS1119_CMD_POWERDOWN);  in ads1119_powerdown()
685 	struct device *dev = &client->dev;  in ads1119_probe()
691 		return dev_err_probe(dev, -ENOMEM,  in ads1119_probe()
695 	st->client = client;  in ads1119_probe()
697 	indio_dev->name = "ads1119";  in ads1119_probe()
698 	indio_dev->info = &ads1119_info;  in ads1119_probe()
699 	indio_dev->modes = INDIO_DIRECT_MODE;  in ads1119_probe()
710 	st->vref_uV = devm_regulator_get_enable_read_voltage(dev, "vref");  in ads1119_probe()
711 	if (st->vref_uV == -ENODEV) {  in ads1119_probe()
713 		st->vref_uV = ADS1119_VREF_INTERNAL_VAL;  in ads1119_probe()
714 	} else if (st->vref_uV < 0) {  in ads1119_probe()
715 		return dev_err_probe(dev, st->vref_uV, "Failed to get vref\n");  in ads1119_probe()
718 	st->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);  in ads1119_probe()
719 	if (IS_ERR(st->reset_gpio))  in ads1119_probe()
720 		return dev_err_probe(dev, PTR_ERR(st->reset_gpio),  in ads1119_probe()
727 	init_completion(&st->completion);  in ads1119_probe()
735 	if (client->irq > 0) {  in ads1119_probe()
736 		ret = devm_request_threaded_irq(dev, client->irq,  in ads1119_probe()
744 		st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",  in ads1119_probe()
745 						  indio_dev->name,  in ads1119_probe()
747 		if (!st->trig)  in ads1119_probe()
748 			return dev_err_probe(dev, -ENOMEM,  in ads1119_probe()
751 		st->trig->ops = &ads1119_trigger_ops;  in ads1119_probe()
752 		iio_trigger_set_drvdata(st->trig, indio_dev);  in ads1119_probe()
754 		ret = devm_iio_trigger_register(dev, st->trig);  in ads1119_probe()
787 	return i2c_smbus_write_byte(st->client, ADS1119_CMD_POWERDOWN);  in ads1119_runtime_suspend()