1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * ADS7138 - Texas Instruments Analog-to-Digital Converter
23  * Always assume 16 bits resolution as HW registers are aligned like that and
24  * with enabled oversampling/averaging it actually corresponds to 16 bits.
110 		return -ENOMEM;  in ads7138_i2c_write_block()
120 		return -EIO;  in ads7138_i2c_write_block()
135 		return -EIO;  in ads7138_i2c_write_with_opcode()
146 static int ads7138_i2c_set_bit(const struct i2c_client *client, u8 reg, u8 bits)  in ads7138_i2c_set_bit()  argument
148 	return ads7138_i2c_write_with_opcode(client, reg, bits,  in ads7138_i2c_set_bit()
152 static int ads7138_i2c_clear_bit(const struct i2c_client *client, u8 reg, u8 bits)  in ads7138_i2c_clear_bit()  argument
154 	return ads7138_i2c_write_with_opcode(client, reg, bits,  in ads7138_i2c_clear_bit()
165 			.addr = client->addr,  in ads7138_i2c_read_block()
170 			.addr = client->addr,  in ads7138_i2c_read_block()
177 	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));  in ads7138_i2c_read_block()
181 		return -EIO;  in ads7138_i2c_read_block()
205 	return -EINVAL;  in ads7138_freq_to_bits()
208 static int ads7138_bits_to_freq(int bits)  in ads7138_bits_to_freq()  argument
213 		if (bits == ads7138_samp_freqs_bits[1][i])  in ads7138_bits_to_freq()
216 	return -EINVAL;  in ads7138_bits_to_freq()
227 	return -EINVAL;  in ads7138_osr_to_bits()
234 	struct ads7138_data *data = iio_priv(indio_dev);  in ads7138_read_raw()  local
235 	int ret, vref, bits;  in ads7138_read_raw()  local
240 		ret = ads7138_i2c_read_block(data->client,  in ads7138_read_raw()
241 					     ADS7138_REG_RECENT_LSB_CH(chan->channel),  in ads7138_read_raw()
249 		ret = ads7138_i2c_read_block(data->client,  in ads7138_read_raw()
250 					     ADS7138_REG_MAX_LSB_CH(chan->channel),  in ads7138_read_raw()
258 		ret = ads7138_i2c_read_block(data->client,  in ads7138_read_raw()
259 					     ADS7138_REG_MIN_LSB_CH(chan->channel),  in ads7138_read_raw()
267 		ret = ads7138_i2c_read(data->client, ADS7138_REG_OPMODE_CFG);  in ads7138_read_raw()
271 		bits = FIELD_GET(ADS7138_OPMODE_CFG_FREQ_MASK, ret);  in ads7138_read_raw()
272 		*val = ads7138_bits_to_freq(bits);  in ads7138_read_raw()
275 		vref = regulator_get_voltage(data->vref_regu);  in ads7138_read_raw()
282 		ret = ads7138_i2c_read(data->client, ADS7138_REG_OSR_CFG);  in ads7138_read_raw()
286 		bits = FIELD_GET(ADS7138_OSR_CFG_MASK, ret);  in ads7138_read_raw()
287 		*val = ads7138_oversampling_ratios[bits];  in ads7138_read_raw()
290 		return -EINVAL;  in ads7138_read_raw()
298 	struct ads7138_data *data = iio_priv(indio_dev);  in ads7138_write_raw()  local
299 	int bits, ret;  in ads7138_write_raw()  local
304 		bits = ads7138_freq_to_bits(val);  in ads7138_write_raw()
305 		if (bits < 0)  in ads7138_write_raw()
306 			return bits;  in ads7138_write_raw()
308 		guard(mutex)(&data->lock);  in ads7138_write_raw()
309 		ret = ads7138_i2c_read(data->client, ADS7138_REG_OPMODE_CFG);  in ads7138_write_raw()
314 		value |= FIELD_PREP(ADS7138_OPMODE_CFG_FREQ_MASK, bits);  in ads7138_write_raw()
315 		return ads7138_i2c_write(data->client, ADS7138_REG_OPMODE_CFG,  in ads7138_write_raw()
319 		bits = ads7138_osr_to_bits(val);  in ads7138_write_raw()
320 		if (bits < 0)  in ads7138_write_raw()
321 			return bits;  in ads7138_write_raw()
323 		return ads7138_i2c_write(data->client, ADS7138_REG_OSR_CFG,  in ads7138_write_raw()
324 					 bits);  in ads7138_write_raw()
326 		return -EINVAL;  in ads7138_write_raw()
336 	struct ads7138_data *data = iio_priv(indio_dev);  in ads7138_read_event()  local
343 			ADS7138_REG_HIGH_TH_HYS_CH(chan->channel) :  in ads7138_read_event()
344 			ADS7138_REG_LOW_TH_CNT_CH(chan->channel);  in ads7138_read_event()
345 		ret = ads7138_i2c_read_block(data->client, reg, values,  in ads7138_read_event()
353 		ret = ads7138_i2c_read(data->client,  in ads7138_read_event()
354 				       ADS7138_REG_HIGH_TH_HYS_CH(chan->channel));  in ads7138_read_event()
361 		return -EINVAL;  in ads7138_read_event()
371 	struct ads7138_data *data = iio_priv(indio_dev);  in ads7138_write_event()  local
378 			return -EINVAL;  in ads7138_write_event()
381 			ADS7138_REG_HIGH_TH_HYS_CH(chan->channel) :  in ads7138_write_event()
382 			ADS7138_REG_LOW_TH_CNT_CH(chan->channel);  in ads7138_write_event()
384 		guard(mutex)(&data->lock);  in ads7138_write_event()
385 		ret = ads7138_i2c_read(data->client, reg);  in ads7138_write_event()
392 		return ads7138_i2c_write_block(data->client, reg, values,  in ads7138_write_event()
397 			return -EINVAL;  in ads7138_write_event()
399 		reg = ADS7138_REG_HIGH_TH_HYS_CH(chan->channel);  in ads7138_write_event()
401 		guard(mutex)(&data->lock);  in ads7138_write_event()
402 		ret = ads7138_i2c_read(data->client, reg);  in ads7138_write_event()
408 		return ads7138_i2c_write(data->client, reg, values[0]);  in ads7138_write_event()
411 		return -EINVAL;  in ads7138_write_event()
420 	struct ads7138_data *data = iio_priv(indio_dev);  in ads7138_read_event_config()  local
424 		return -EINVAL;  in ads7138_read_event_config()
426 	ret = ads7138_i2c_read(data->client, ADS7138_REG_ALERT_CH_SEL);  in ads7138_read_event_config()
430 	return (ret & BIT(chan->channel)) ? 1 : 0;  in ads7138_read_event_config()
438 	struct ads7138_data *data = iio_priv(indio_dev);  in ads7138_write_event_config()  local
441 		return -EINVAL;  in ads7138_write_event_config()
444 		return ads7138_i2c_set_bit(data->client,  in ads7138_write_event_config()
446 					   BIT(chan->channel));  in ads7138_write_event_config()
448 		return ads7138_i2c_clear_bit(data->client,  in ads7138_write_event_config()
450 					     BIT(chan->channel));  in ads7138_write_event_config()
472 		return -EINVAL;  in ads7138_read_avail()
535 	struct ads7138_data *data = iio_priv(indio_dev);  in ads7138_event_handler()  local
536 	struct device *dev = &data->client->dev;  in ads7138_event_handler()
542 	ret = ads7138_i2c_read(data->client, ADS7138_REG_EVENT_FLAG);  in ads7138_event_handler()
546 	ret = ads7138_i2c_read(data->client, ADS7138_REG_EVENT_HIGH_FLAG);  in ads7138_event_handler()
553 	ret = ads7138_i2c_read(data->client, ADS7138_REG_EVENT_LOW_FLAG);  in ads7138_event_handler()
560 	for (i = 0; i < data->chip_data->channel_num; i++) {  in ads7138_event_handler()
578 	ret = ads7138_i2c_write(data->client, ADS7138_REG_EVENT_HIGH_FLAG, 0xFF);  in ads7138_event_handler()
582 	ret = ads7138_i2c_write(data->client, ADS7138_REG_EVENT_LOW_FLAG, 0xFF);  in ads7138_event_handler()
589 static int ads7138_set_conv_mode(struct ads7138_data *data,  in ads7138_set_conv_mode()  argument
593 		return ads7138_i2c_set_bit(data->client, ADS7138_REG_OPMODE_CFG,  in ads7138_set_conv_mode()
595 	return ads7138_i2c_clear_bit(data->client, ADS7138_REG_OPMODE_CFG,  in ads7138_set_conv_mode()
599 static int ads7138_init_hw(struct ads7138_data *data)  in ads7138_init_hw()  argument
601 	struct device *dev = &data->client->dev;  in ads7138_init_hw()
604 	data->vref_regu = devm_regulator_get(dev, "avdd");  in ads7138_init_hw()
605 	if (IS_ERR(data->vref_regu))  in ads7138_init_hw()
606 		return dev_err_probe(dev, PTR_ERR(data->vref_regu),  in ads7138_init_hw()
609 	ret = regulator_get_voltage(data->vref_regu);  in ads7138_init_hw()
614 	ret = ads7138_i2c_set_bit(data->client, ADS7138_REG_GENERAL_CFG,  in ads7138_init_hw()
619 	ret = ads7138_set_conv_mode(data, ADS7138_MODE_AUTO);  in ads7138_init_hw()
624 	ret = ads7138_i2c_set_bit(data->client, ADS7138_REG_GENERAL_CFG,  in ads7138_init_hw()
631 	ret = ads7138_i2c_set_bit(data->client, ADS7138_REG_AUTO_SEQ_CH_SEL, 0xFF);  in ads7138_init_hw()
636 	return ads7138_i2c_set_bit(data->client, ADS7138_REG_SEQUENCE_CFG,  in ads7138_init_hw()
643 	struct device *dev = &client->dev;  in ads7138_probe()
645 	struct ads7138_data *data;  in ads7138_probe()  local
648 	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));  in ads7138_probe()
650 		return -ENOMEM;  in ads7138_probe()
652 	data = iio_priv(indio_dev);  in ads7138_probe()
653 	data->client = client;  in ads7138_probe()
654 	data->chip_data = i2c_get_match_data(client);  in ads7138_probe()
655 	if (!data->chip_data)  in ads7138_probe()
656 		return -ENODEV;  in ads7138_probe()
658 	ret = devm_mutex_init(dev, &data->lock);  in ads7138_probe()
662 	indio_dev->name = data->chip_data->name;  in ads7138_probe()
663 	indio_dev->modes = INDIO_DIRECT_MODE;  in ads7138_probe()
664 	indio_dev->channels = ads7138_channels;  in ads7138_probe()
665 	indio_dev->num_channels = ARRAY_SIZE(ads7138_channels);  in ads7138_probe()
666 	indio_dev->info = &ti_ads7138_info;  in ads7138_probe()
670 	if (client->irq > 0) {  in ads7138_probe()
671 		ret = devm_request_threaded_irq(dev, client->irq,  in ads7138_probe()
675 						client->name, indio_dev);  in ads7138_probe()
680 	ret = ads7138_init_hw(data);  in ads7138_probe()
694 	struct ads7138_data *data = iio_priv(indio_dev);  in ads7138_runtime_suspend()  local
696 	return ads7138_set_conv_mode(data, ADS7138_MODE_MANUAL);  in ads7138_runtime_suspend()
702 	struct ads7138_data *data = iio_priv(indio_dev);  in ads7138_runtime_resume()  local
704 	return ads7138_set_conv_mode(data, ADS7138_MODE_AUTO);  in ads7138_runtime_resume()
723 	{ .compatible = "ti,ads7128", .data = &ads7128_data },
724 	{ .compatible = "ti,ads7138", .data = &ads7138_data },