1 // SPDX-License-Identifier: GPL-2.0-only
4  * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
7  * Copyright (C) 2008-2010 Jonathan Cameron
10  * Copyright (C) 2002-2004 Stefan Eletzhofer
101  * struct ad799x_chip_config - chip specific information
113  * struct ad799x_chip_info - chip specific information
128 	struct regulator		*vref;  member
140 	switch (st->id) {  in ad799x_write_config()
143 		return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,  in ad799x_write_config()
148 		return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,  in ad799x_write_config()
152 		st->config = val;  in ad799x_write_config()
159 	switch (st->id) {  in ad799x_read_config()
162 		return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);  in ad799x_read_config()
166 		return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);  in ad799x_read_config()
169 		return st->config;  in ad799x_read_config()
183 	st->config = ret;  in ad799x_update_config()
188 static irqreturn_t ad799x_trigger_handler(int irq, void *p)  in ad799x_trigger_handler()  argument
190 	struct iio_poll_func *pf = p;  in ad799x_trigger_handler()
191 	struct iio_dev *indio_dev = pf->indio_dev;  in ad799x_trigger_handler()
196 	switch (st->id) {  in ad799x_trigger_handler()
200 		cmd = st->config |  in ad799x_trigger_handler()
201 			(*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);  in ad799x_trigger_handler()
206 		cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |  in ad799x_trigger_handler()
217 	b_sent = i2c_smbus_read_i2c_block_data(st->client,  in ad799x_trigger_handler()
218 			cmd, st->transfer_size, st->rx_buf);  in ad799x_trigger_handler()
222 	iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,  in ad799x_trigger_handler()
225 	iio_trigger_notify_done(indio_dev->trig);  in ad799x_trigger_handler()
235 	kfree(st->rx_buf);  in ad799x_update_scan_mode()
236 	st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);  in ad799x_update_scan_mode()
237 	if (!st->rx_buf)  in ad799x_update_scan_mode()
238 		return -ENOMEM;  in ad799x_update_scan_mode()
240 	st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;  in ad799x_update_scan_mode()
242 	switch (st->id) {  in ad799x_update_scan_mode()
248 		st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);  in ad799x_update_scan_mode()
249 		st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);  in ad799x_update_scan_mode()
250 		return ad799x_write_config(st, st->config);  in ad799x_update_scan_mode()
260 	switch (st->id) {  in ad799x_scan_direct()
264 		cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);  in ad799x_scan_direct()
276 		return -EINVAL;  in ad799x_scan_direct()
279 	return i2c_smbus_read_word_swapped(st->client, cmd);  in ad799x_scan_direct()
296 		mutex_lock(&st->lock);  in ad799x_read_raw()
297 		ret = ad799x_scan_direct(st, chan->scan_index);  in ad799x_read_raw()
298 		mutex_unlock(&st->lock);  in ad799x_read_raw()
303 		*val = (ret >> chan->scan_type.shift) &  in ad799x_read_raw()
304 			GENMASK(chan->scan_type.realbits - 1, 0);  in ad799x_read_raw()
307 		if (st->vref)  in ad799x_read_raw()
308 			ret = regulator_get_voltage(st->vref);  in ad799x_read_raw()
310 			ret = regulator_get_voltage(st->reg);  in ad799x_read_raw()
315 		*val2 = chan->scan_type.realbits;  in ad799x_read_raw()
318 	return -EINVAL;  in ad799x_read_raw()
337 	int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);  in ad799x_read_frequency()
359 	mutex_lock(&st->lock);  in ad799x_write_frequency()
361 	ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);  in ad799x_write_frequency()
371 		ret = -EINVAL;  in ad799x_write_frequency()
375 	ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,  in ad799x_write_frequency()
382 	mutex_unlock(&st->lock);  in ad799x_write_frequency()
394 	if (!(st->config & AD7998_ALERT_EN))  in ad799x_read_event_config()
397 	if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))  in ad799x_read_event_config()
416 	mutex_lock(&st->lock);  in ad799x_write_event_config()
419 		st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;  in ad799x_write_event_config()
421 		st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);  in ad799x_write_event_config()
423 	if (st->config >> AD799X_CHANNEL_SHIFT)  in ad799x_write_event_config()
424 		st->config |= AD7998_ALERT_EN;  in ad799x_write_event_config()
426 		st->config &= ~AD7998_ALERT_EN;  in ad799x_write_event_config()
428 	ret = ad799x_write_config(st, st->config);  in ad799x_write_event_config()
429 	mutex_unlock(&st->lock);  in ad799x_write_event_config()
441 			return AD7998_DATALOW_REG(chan->channel);  in ad799x_threshold_reg()
443 			return AD7998_DATAHIGH_REG(chan->channel);  in ad799x_threshold_reg()
445 		return AD7998_HYST_REG(chan->channel);  in ad799x_threshold_reg()
447 		return -EINVAL;  in ad799x_threshold_reg()
463 	if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))  in ad799x_write_event_value()
464 		return -EINVAL;  in ad799x_write_event_value()
466 	ret = i2c_smbus_write_word_swapped(st->client,  in ad799x_write_event_value()
468 		val << chan->scan_type.shift);  in ad799x_write_event_value()
483 	ret = i2c_smbus_read_word_swapped(st->client,  in ad799x_read_event_value()
487 	*val = (ret >> chan->scan_type.shift) &  in ad799x_read_event_value()
488 		GENMASK(chan->scan_type.realbits - 1, 0);  in ad799x_read_event_value()
499 	ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);  in ad799x_event_handler()
503 	if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,  in ad799x_event_handler()
590 		.shift = 12 - (_realbits), \
786 		&ad799x_chip_info_tbl[id->driver_data];  in ad799x_probe()
788 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));  in ad799x_probe()
790 		return -ENOMEM;  in ad799x_probe()
796 	st->id = id->driver_data;  in ad799x_probe()
797 	if (client->irq > 0 && chip_info->irq_config.info)  in ad799x_probe()
798 		st->chip_config = &chip_info->irq_config;  in ad799x_probe()
800 		st->chip_config = &chip_info->noirq_config;  in ad799x_probe()
804 	st->reg = devm_regulator_get(&client->dev, "vcc");  in ad799x_probe()
805 	if (IS_ERR(st->reg))  in ad799x_probe()
806 		return PTR_ERR(st->reg);  in ad799x_probe()
807 	ret = regulator_enable(st->reg);  in ad799x_probe()
812 	st->vref = devm_regulator_get_optional(&client->dev, "vref");  in ad799x_probe()
814 	if (IS_ERR(st->vref)) {  in ad799x_probe()
815 		if (PTR_ERR(st->vref) == -ENODEV) {  in ad799x_probe()
816 			st->vref = NULL;  in ad799x_probe()
817 			dev_info(&client->dev, "Using VCC reference voltage\n");  in ad799x_probe()
819 			ret = PTR_ERR(st->vref);  in ad799x_probe()
824 	if (st->vref) {  in ad799x_probe()
829 		if ((st->id == ad7991) || (st->id == ad7995) || (st->id == ad7999)) {  in ad799x_probe()
830 			dev_info(&client->dev, "Using external reference voltage\n");  in ad799x_probe()
832 			ret = regulator_enable(st->vref);  in ad799x_probe()
836 			st->vref = NULL;  in ad799x_probe()
837 			dev_warn(&client->dev, "Supplied reference not supported\n");  in ad799x_probe()
841 	st->client = client;  in ad799x_probe()
843 	indio_dev->name = id->name;  in ad799x_probe()
844 	indio_dev->info = st->chip_config->info;  in ad799x_probe()
846 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad799x_probe()
847 	indio_dev->channels = st->chip_config->channel;  in ad799x_probe()
848 	indio_dev->num_channels = chip_info->num_channels;  in ad799x_probe()
850 	ret = ad799x_update_config(st, st->chip_config->default_config | extra_config);  in ad799x_probe()
859 	if (client->irq > 0) {  in ad799x_probe()
860 		ret = devm_request_threaded_irq(&client->dev,  in ad799x_probe()
861 						client->irq,  in ad799x_probe()
866 						client->name,  in ad799x_probe()
872 	mutex_init(&st->lock);  in ad799x_probe()
883 	if (st->vref)  in ad799x_probe()
884 		regulator_disable(st->vref);  in ad799x_probe()
886 	regulator_disable(st->reg);  in ad799x_probe()
899 	if (st->vref)  in ad799x_remove()
900 		regulator_disable(st->vref);  in ad799x_remove()
901 	regulator_disable(st->reg);  in ad799x_remove()
902 	kfree(st->rx_buf);  in ad799x_remove()
910 	if (st->vref)  in ad799x_suspend()
911 		regulator_disable(st->vref);  in ad799x_suspend()
912 	regulator_disable(st->reg);  in ad799x_suspend()
923 	ret = regulator_enable(st->reg);  in ad799x_resume()
929 	if (st->vref) {  in ad799x_resume()
930 		ret = regulator_enable(st->vref);  in ad799x_resume()
932 			regulator_disable(st->reg);  in ad799x_resume()
933 			dev_err(dev, "Unable to enable vref regulator\n");  in ad799x_resume()
939 	ret = ad799x_update_config(st, st->config);  in ad799x_resume()
941 		if (st->vref)  in ad799x_resume()
942 			regulator_disable(st->vref);  in ad799x_resume()
943 		regulator_disable(st->reg);  in ad799x_resume()