1 // SPDX-License-Identifier: GPL-2.0-only
3  * IIO DAC driver for Analog Devices AD8801 DAC
5  * Copyright (C) 2016 Gwenhael Goavec-Merou
8 #include <linux/iio/iio.h>
10 #include <linux/regulator/consumer.h>
33 	state->data = cpu_to_be16((channel << AD8801_CFG_ADDR_OFFSET) | value);  in ad8801_spi_write()
34 	return spi_write(state->spi, &state->data, sizeof(state->data));  in ad8801_spi_write()
46 			return -EINVAL;  in ad8801_write_raw()
48 		ret = ad8801_spi_write(state, chan->channel, val);  in ad8801_write_raw()
50 			state->dac_cache[chan->channel] = val;  in ad8801_write_raw()
53 		ret = -EINVAL;  in ad8801_write_raw()
66 		*val = state->dac_cache[chan->channel];  in ad8801_read_raw()
69 		*val = state->vrefh_mv - state->vrefl_mv;  in ad8801_read_raw()
73 		*val = state->vrefl_mv;  in ad8801_read_raw()
76 		return -EINVAL;  in ad8801_read_raw()
79 	return -EINVAL;  in ad8801_read_raw()
115 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*state));  in ad8801_probe()
117 		return -ENOMEM;  in ad8801_probe()
120 	state->spi = spi;  in ad8801_probe()
123 	ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vrefh");  in ad8801_probe()
125 		return dev_err_probe(&spi->dev, ret,  in ad8801_probe()
128 	state->vrefh_mv = ret / 1000;  in ad8801_probe()
130 	if (id->driver_data == ID_AD8803) {  in ad8801_probe()
131 		ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vrefl");  in ad8801_probe()
133 			return dev_err_probe(&spi->dev, ret,  in ad8801_probe()
136 		state->vrefl_mv = ret / 1000;  in ad8801_probe()
139 	indio_dev->info = &ad8801_info;  in ad8801_probe()
140 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad8801_probe()
141 	indio_dev->channels = ad8801_channels;  in ad8801_probe()
142 	indio_dev->num_channels = ARRAY_SIZE(ad8801_channels);  in ad8801_probe()
143 	indio_dev->name = id->name;  in ad8801_probe()
145 	ret = devm_iio_device_register(&spi->dev, indio_dev);  in ad8801_probe()
147 		return dev_err_probe(&spi->dev, ret,  in ad8801_probe()
148 				     "Failed to register iio device\n");  in ad8801_probe()
169 MODULE_AUTHOR("Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>");