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
119 	st->data[0].d32 = cpu_to_be32(AD5761_ADDR(addr) | val);  in _ad5761_spi_write()
121 	return spi_write(st->spi, &st->data[0].d8[1], 3);  in _ad5761_spi_write()
129 	mutex_lock(&st->lock);  in ad5761_spi_write()
131 	mutex_unlock(&st->lock);  in ad5761_spi_write()
141 			.tx_buf = &st->data[0].d8[1],  in _ad5761_spi_read()
146 			.tx_buf = &st->data[1].d8[1],  in _ad5761_spi_read()
147 			.rx_buf = &st->data[2].d8[1],  in _ad5761_spi_read()
153 	st->data[0].d32 = cpu_to_be32(AD5761_ADDR(addr));  in _ad5761_spi_read()
154 	st->data[1].d32 = cpu_to_be32(AD5761_ADDR(AD5761_ADDR_NOOP));  in _ad5761_spi_read()
156 	ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers));  in _ad5761_spi_read()
158 	*val = be32_to_cpu(st->data[2].d32);  in _ad5761_spi_read()
168 	mutex_lock(&st->lock);  in ad5761_spi_read()
170 	mutex_unlock(&st->lock);  in ad5761_spi_read()
178 	u16 aux;  in ad5761_spi_set_range()  local
181 	aux = (range & 0x7) | AD5761_CTRL_ETS;  in ad5761_spi_set_range()
183 	if (st->use_intref)  in ad5761_spi_set_range()
184 		aux |= AD5761_CTRL_USE_INTVREF;  in ad5761_spi_set_range()
190 	ret = _ad5761_spi_write(st, AD5761_ADDR_CTRL_WRITE_REG, aux);  in ad5761_spi_set_range()
194 	st->range = range;  in ad5761_spi_set_range()
207 	u16 aux;  in ad5761_read_raw()  local
211 		ret = ad5761_spi_read(indio_dev, AD5761_ADDR_DAC_READ, &aux);  in ad5761_read_raw()
214 		*val = aux >> chan->scan_type.shift;  in ad5761_read_raw()
218 		*val = st->vref * ad5761_range_params[st->range].m;  in ad5761_read_raw()
220 		*val2 = chan->scan_type.realbits;  in ad5761_read_raw()
224 		*val = -(1 << chan->scan_type.realbits);  in ad5761_read_raw()
225 		*val *=	ad5761_range_params[st->range].c;  in ad5761_read_raw()
226 		*val /=	ad5761_range_params[st->range].m;  in ad5761_read_raw()
229 		return -EINVAL;  in ad5761_read_raw()
239 	u16 aux;  in ad5761_write_raw()  local
242 		return -EINVAL;  in ad5761_write_raw()
244 	if (val2 || (val << chan->scan_type.shift) > 0xffff || val < 0)  in ad5761_write_raw()
245 		return -EINVAL;  in ad5761_write_raw()
247 	aux = val << chan->scan_type.shift;  in ad5761_write_raw()
249 	return ad5761_spi_write(indio_dev, AD5761_ADDR_DAC_WRITE, aux);  in ad5761_write_raw()
267 		.shift = 16 - (_bits),			\
295 	st->vref_reg = devm_regulator_get_optional(&st->spi->dev, "vref");  in ad5761_get_vref()
296 	if (PTR_ERR(st->vref_reg) == -ENODEV) {  in ad5761_get_vref()
298 		if (!chip_info->int_vref) {  in ad5761_get_vref()
299 			dev_err(&st->spi->dev,  in ad5761_get_vref()
301 			return -EIO;  in ad5761_get_vref()
304 		st->use_intref = true;  in ad5761_get_vref()
305 		st->vref = chip_info->int_vref;  in ad5761_get_vref()
309 	if (IS_ERR(st->vref_reg)) {  in ad5761_get_vref()
310 		dev_err(&st->spi->dev,  in ad5761_get_vref()
312 		return PTR_ERR(st->vref_reg);  in ad5761_get_vref()
315 	ret = regulator_enable(st->vref_reg);  in ad5761_get_vref()
317 		dev_err(&st->spi->dev,  in ad5761_get_vref()
322 	ret = regulator_get_voltage(st->vref_reg);  in ad5761_get_vref()
324 		dev_err(&st->spi->dev,  in ad5761_get_vref()
330 		dev_warn(&st->spi->dev,  in ad5761_get_vref()
332 		ret = -EIO;  in ad5761_get_vref()
336 	st->vref = ret / 1000;  in ad5761_get_vref()
337 	st->use_intref = false;  in ad5761_get_vref()
342 	regulator_disable(st->vref_reg);  in ad5761_get_vref()
343 	st->vref_reg = NULL;  in ad5761_get_vref()
353 		&ad5761_chip_infos[spi_get_device_id(spi)->driver_data];  in ad5761_probe()
355 	struct ad5761_platform_data *pdata = dev_get_platdata(&spi->dev);  in ad5761_probe()
357 	iio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad5761_probe()
359 		return -ENOMEM;  in ad5761_probe()
363 	st->spi = spi;  in ad5761_probe()
371 		voltage_range = pdata->voltage_range;  in ad5761_probe()
373 	mutex_init(&st->lock);  in ad5761_probe()
379 	iio_dev->info = &ad5761_info;  in ad5761_probe()
380 	iio_dev->modes = INDIO_DIRECT_MODE;  in ad5761_probe()
381 	iio_dev->channels = &chip_info->channel;  in ad5761_probe()
382 	iio_dev->num_channels = 1;  in ad5761_probe()
383 	iio_dev->name = spi_get_device_id(st->spi)->name;  in ad5761_probe()
391 	if (!IS_ERR_OR_NULL(st->vref_reg))  in ad5761_probe()
392 		regulator_disable(st->vref_reg);  in ad5761_probe()
404 	if (!IS_ERR_OR_NULL(st->vref_reg))  in ad5761_remove()
405 		regulator_disable(st->vref_reg);  in ad5761_remove()