1 // SPDX-License-Identifier: GPL-2.0-only
12 #include <linux/iio/iio.h>
13 #include <linux/iio/sysfs.h>
30  * struct ad5761_chip_info - chip specific information
31  * @int_vref:	Value of the internal reference voltage in mV - 0 if external
54  * struct ad5761_state - driver instance specific data
117 	st->data[0].d32 = cpu_to_be32(AD5761_ADDR(addr) | val);  in _ad5761_spi_write()
119 	return spi_write(st->spi, &st->data[0].d8[1], 3);  in _ad5761_spi_write()
127 	mutex_lock(&st->lock);  in ad5761_spi_write()
129 	mutex_unlock(&st->lock);  in ad5761_spi_write()
139 			.tx_buf = &st->data[0].d8[1],  in _ad5761_spi_read()
144 			.tx_buf = &st->data[1].d8[1],  in _ad5761_spi_read()
145 			.rx_buf = &st->data[2].d8[1],  in _ad5761_spi_read()
151 	st->data[0].d32 = cpu_to_be32(AD5761_ADDR(addr));  in _ad5761_spi_read()
152 	st->data[1].d32 = cpu_to_be32(AD5761_ADDR(AD5761_ADDR_NOOP));  in _ad5761_spi_read()
154 	ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers));  in _ad5761_spi_read()
156 	*val = be32_to_cpu(st->data[2].d32);  in _ad5761_spi_read()
166 	mutex_lock(&st->lock);  in ad5761_spi_read()
168 	mutex_unlock(&st->lock);  in ad5761_spi_read()
176 	u16 aux;  in ad5761_spi_set_range()  local
179 	aux = (range & 0x7) | AD5761_CTRL_ETS;  in ad5761_spi_set_range()
181 	if (st->use_intref)  in ad5761_spi_set_range()
182 		aux |= AD5761_CTRL_USE_INTVREF;  in ad5761_spi_set_range()
188 	ret = _ad5761_spi_write(st, AD5761_ADDR_CTRL_WRITE_REG, aux);  in ad5761_spi_set_range()
192 	st->range = range;  in ad5761_spi_set_range()
205 	u16 aux;  in ad5761_read_raw()  local
209 		ret = ad5761_spi_read(indio_dev, AD5761_ADDR_DAC_READ, &aux);  in ad5761_read_raw()
212 		*val = aux >> chan->scan_type.shift;  in ad5761_read_raw()
216 		*val = st->vref * ad5761_range_params[st->range].m;  in ad5761_read_raw()
218 		*val2 = chan->scan_type.realbits;  in ad5761_read_raw()
222 		*val = -(1 << chan->scan_type.realbits);  in ad5761_read_raw()
223 		*val *=	ad5761_range_params[st->range].c;  in ad5761_read_raw()
224 		*val /=	ad5761_range_params[st->range].m;  in ad5761_read_raw()
227 		return -EINVAL;  in ad5761_read_raw()
237 	u16 aux;  in ad5761_write_raw()  local
240 		return -EINVAL;  in ad5761_write_raw()
242 	if (val2 || (val << chan->scan_type.shift) > 0xffff || val < 0)  in ad5761_write_raw()
243 		return -EINVAL;  in ad5761_write_raw()
245 	aux = val << chan->scan_type.shift;  in ad5761_write_raw()
247 	return ad5761_spi_write(indio_dev, AD5761_ADDR_DAC_WRITE, aux);  in ad5761_write_raw()
265 		.shift = 16 - (_bits),			\
294 		&ad5761_chip_infos[spi_get_device_id(spi)->driver_data];  in ad5761_probe()
296 	struct ad5761_platform_data *pdata = dev_get_platdata(&spi->dev);  in ad5761_probe()
298 	iio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad5761_probe()
300 		return -ENOMEM;  in ad5761_probe()
304 	st->spi = spi;  in ad5761_probe()
306 	ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vref");  in ad5761_probe()
307 	if (ret < 0 && ret != -ENODEV)  in ad5761_probe()
308 		return dev_err_probe(&spi->dev, ret,  in ad5761_probe()
310 	if (ret == -ENODEV) {  in ad5761_probe()
312 		if (!chip_info->int_vref)  in ad5761_probe()
313 			return dev_err_probe(&spi->dev, -EIO,  in ad5761_probe()
316 		st->use_intref = true;  in ad5761_probe()
317 		st->vref = chip_info->int_vref;  in ad5761_probe()
320 			return dev_err_probe(&spi->dev, -EIO,  in ad5761_probe()
324 		st->use_intref = false;  in ad5761_probe()
325 		st->vref = ret / 1000;  in ad5761_probe()
329 		voltage_range = pdata->voltage_range;  in ad5761_probe()
331 	mutex_init(&st->lock);  in ad5761_probe()
337 	iio_dev->info = &ad5761_info;  in ad5761_probe()
338 	iio_dev->modes = INDIO_DIRECT_MODE;  in ad5761_probe()
339 	iio_dev->channels = &chip_info->channel;  in ad5761_probe()
340 	iio_dev->num_channels = 1;  in ad5761_probe()
341 	iio_dev->name = spi_get_device_id(st->spi)->name;  in ad5761_probe()
343 	return devm_iio_device_register(&spi->dev, iio_dev);  in ad5761_probe()