1 // SPDX-License-Identifier: GPL-2.0-only
6  *  Author: Lars-Peter Clausen <lars@metafoo.de>
71 		.differential = (_channel2 == -1 ? 0 : 1), \
99 	__AD7991_CHANNEL(_si, _channel, -1, _address, _bits, \
111 	__AD7991_CHANNEL(_si, _channel, -1, _address, _bits, \
112 		_storagebits, _shift, "supply", IIO_VOLTAGE, \
244 	st->mode &= ~AD7791_MODE_SEL_MASK;  in ad7791_set_mode()
245 	st->mode |= AD7791_MODE_SEL(mode);  in ad7791_set_mode()
247 	return ad_sd_write_reg(sd, AD7791_REG_MODE, sizeof(st->mode), st->mode);  in ad7791_set_mode()
263 	bool unipolar = !!(st->mode & AD7791_MODE_UNIPOLAR);  in ad7791_read_raw()
272 		 * Bipolar -VREF to VREF  in ad7791_read_raw()
277 			*val = -(1 << (chan->scan_type.realbits - 1));  in ad7791_read_raw()
281 		if (chan->address == AD7791_CH_AVDD_MONITOR) {  in ad7791_read_raw()
290 			voltage_uv = regulator_get_voltage(st->reg);  in ad7791_read_raw()
297 			*val2 = chan->scan_type.realbits;  in ad7791_read_raw()
299 			*val2 = chan->scan_type.realbits - 1;  in ad7791_read_raw()
303 		rate = st->filter & AD7791_FILTER_RATE_MASK;  in ad7791_read_raw()
309 	return -EINVAL;  in ad7791_read_raw()
331 			ret = -EINVAL;  in ad7791_write_raw()
335 		st->filter &= ~AD7791_FILTER_RATE_MASK;  in ad7791_write_raw()
336 		st->filter |= i;  in ad7791_write_raw()
337 		ad_sd_write_reg(&st->sd, AD7791_REG_FILTER,  in ad7791_write_raw()
338 				sizeof(st->filter),  in ad7791_write_raw()
339 				st->filter);  in ad7791_write_raw()
342 		ret = -EINVAL;  in ad7791_write_raw()
376 	/* Set to poweron-reset default values */  in ad7791_setup()
377 	st->mode = AD7791_MODE_BUFFER;  in ad7791_setup()
378 	st->filter = AD7791_FILTER_RATE_16_6;  in ad7791_setup()
383 	if ((st->info->flags & AD7791_FLAG_HAS_BUFFER) && !pdata->buffered)  in ad7791_setup()
384 		st->mode &= ~AD7791_MODE_BUFFER;  in ad7791_setup()
386 	if ((st->info->flags & AD7791_FLAG_HAS_BURNOUT) &&  in ad7791_setup()
387 		pdata->burnout_current)  in ad7791_setup()
388 		st->mode |= AD7791_MODE_BURNOUT;  in ad7791_setup()
390 	if ((st->info->flags & AD7791_FLAG_HAS_UNIPOLAR) && pdata->unipolar)  in ad7791_setup()
391 		st->mode |= AD7791_MODE_UNIPOLAR;  in ad7791_setup()
393 	return ad_sd_write_reg(&st->sd, AD7791_REG_MODE, sizeof(st->mode),  in ad7791_setup()
394 		st->mode);  in ad7791_setup()
404 	struct ad7791_platform_data *pdata = spi->dev.platform_data;  in ad7791_probe()
409 	if (!spi->irq) {  in ad7791_probe()
410 		dev_err(&spi->dev, "Missing IRQ.\n");  in ad7791_probe()
411 		return -ENXIO;  in ad7791_probe()
414 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad7791_probe()
416 		return -ENOMEM;  in ad7791_probe()
420 	st->reg = devm_regulator_get(&spi->dev, "refin");  in ad7791_probe()
421 	if (IS_ERR(st->reg))  in ad7791_probe()
422 		return PTR_ERR(st->reg);  in ad7791_probe()
424 	ret = regulator_enable(st->reg);  in ad7791_probe()
428 	ret = devm_add_action_or_reset(&spi->dev, ad7791_reg_disable, st->reg);  in ad7791_probe()
432 	st->info = &ad7791_chip_infos[spi_get_device_id(spi)->driver_data];  in ad7791_probe()
433 	ad_sd_init(&st->sd, indio_dev, spi, &ad7791_sigma_delta_info);  in ad7791_probe()
435 	indio_dev->name = spi_get_device_id(spi)->name;  in ad7791_probe()
436 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad7791_probe()
437 	indio_dev->channels = st->info->channels;  in ad7791_probe()
438 	indio_dev->num_channels = st->info->num_channels;  in ad7791_probe()
439 	if (st->info->flags & AD7791_FLAG_HAS_FILTER)  in ad7791_probe()
440 		indio_dev->info = &ad7791_info;  in ad7791_probe()
442 		indio_dev->info = &ad7791_no_filter_info;  in ad7791_probe()
444 	ret = devm_ad_sd_setup_buffer_and_trigger(&spi->dev, indio_dev);  in ad7791_probe()
452 	return devm_iio_device_register(&spi->dev, indio_dev);  in ad7791_probe()
474 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");