1 // SPDX-License-Identifier: GPL-2.0
3  * Analog Devices AD7292 SPI ADC driver
94 	st->d8[0] = AD7292_RD_FLAG_MSK(addr);  in ad7292_spi_reg_read()
96 	ret = spi_write_then_read(st->spi, st->d8, 1, &st->d16, 2);  in ad7292_spi_reg_read()
100 	return be16_to_cpu(st->d16);  in ad7292_spi_reg_read()
106 	unsigned int shift = 16 - (8 * len);  in ad7292_spi_subreg_read()
109 	st->d8[0] = AD7292_RD_FLAG_MSK(addr);  in ad7292_spi_subreg_read()
110 	st->d8[1] = sub_addr;  in ad7292_spi_subreg_read()
112 	ret = spi_write_then_read(st->spi, st->d8, 2, &st->d16, len);  in ad7292_spi_subreg_read()
116 	return (be16_to_cpu(st->d16) >> shift);  in ad7292_spi_subreg_read()
126 			.tx_buf = &st->d8,  in ad7292_single_conversion()
133 			.rx_buf = &st->d16,  in ad7292_single_conversion()
138 	st->d8[0] = chan_addr;  in ad7292_single_conversion()
139 	st->d8[1] = AD7292_RD_FLAG_MSK(AD7292_REG_CONV_COMM);  in ad7292_single_conversion()
141 	ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t));  in ad7292_single_conversion()
146 	return be16_to_cpu(st->d16);  in ad7292_single_conversion()
154 	 * Every AD7292 ADC channel may have its input range adjusted according  in ad7292_vin_range_multiplier()
155 	 * to the settings at the ADC sampling mode and VIN range subregisters.  in ad7292_vin_range_multiplier()
198 			return -EPERM;  in ad7292_vin_range_multiplier()
216 		ch_addr = AD7292_REG_ADC_CH(chan->channel);  in ad7292_read_raw()
230 		 * number of possible distinct input values. Given the ADC data  in ad7292_read_raw()
237 		ret = ad7292_vin_range_multiplier(st, chan->channel);  in ad7292_read_raw()
241 		*val = st->vref_mv * ret;  in ad7292_read_raw()
247 	return -EINVAL;  in ad7292_read_raw()
261 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad7292_probe()
263 		return -ENOMEM;  in ad7292_probe()
266 	st->spi = spi;  in ad7292_probe()
270 		dev_err(&spi->dev, "Wrong vendor id 0x%x\n", ret);  in ad7292_probe()
271 		return -EINVAL;  in ad7292_probe()
274 	ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vref");  in ad7292_probe()
275 	if (ret < 0 && ret != -ENODEV)  in ad7292_probe()
278 	st->vref_mv = ret == -ENODEV ? AD7292_INTERNAL_REF_MV : ret / 1000;  in ad7292_probe()
280 	indio_dev->name = spi_get_device_id(spi)->name;  in ad7292_probe()
281 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad7292_probe()
282 	indio_dev->info = &ad7292_info;  in ad7292_probe()
284 	device_for_each_child_node_scoped(&spi->dev, child) {  in ad7292_probe()
286 							  "diff-channels");  in ad7292_probe()
292 		indio_dev->num_channels = ARRAY_SIZE(ad7292_channels_diff);  in ad7292_probe()
293 		indio_dev->channels = ad7292_channels_diff;  in ad7292_probe()
295 		indio_dev->num_channels = ARRAY_SIZE(ad7292_channels);  in ad7292_probe()
296 		indio_dev->channels = ad7292_channels;  in ad7292_probe()
299 	return devm_iio_device_register(&spi->dev, indio_dev);  in ad7292_probe()
325 MODULE_DESCRIPTION("Analog Devices AD7292 ADC driver");