1 // SPDX-License-Identifier: GPL-2.0-only
3  * Analog devices AD5764, AD5764R, AD5744, AD5744R quad-channel
16 #include <linux/regulator/consumer.h>
18 #include <linux/iio/iio.h>
19 #include <linux/iio/sysfs.h>
33  * struct ad5764_chip_info - chip specific information
34  * @int_vref:	Value of the internal reference voltage in uV - 0 if external
44  * struct ad5764_state - driver instance specific data
90 		.shift = 16 - (_bits),				\
130 	mutex_lock(&st->lock);  in ad5764_write()
131 	st->data[0].d32 = cpu_to_be32((reg << 16) | val);  in ad5764_write()
133 	ret = spi_write(st->spi, &st->data[0].d8[1], 3);  in ad5764_write()
134 	mutex_unlock(&st->lock);  in ad5764_write()
146 			.tx_buf = &st->data[0].d8[1],  in ad5764_read()
150 			.rx_buf = &st->data[1].d8[1],  in ad5764_read()
155 	mutex_lock(&st->lock);  in ad5764_read()
157 	st->data[0].d32 = cpu_to_be32((1 << 23) | (reg << 16));  in ad5764_read()
159 	ret = spi_sync_transfer(st->spi, t, ARRAY_SIZE(t));  in ad5764_read()
161 		*val = be32_to_cpu(st->data[1].d32) & 0xffff;  in ad5764_read()
163 	mutex_unlock(&st->lock);  in ad5764_read()
172 		return AD5764_REG_DATA(chan->address);  in ad5764_chan_info_to_reg()
174 		return AD5764_REG_OFFSET(chan->address);  in ad5764_chan_info_to_reg()
176 		return AD5764_REG_FINE_GAIN(chan->address);  in ad5764_chan_info_to_reg()
187 	const int max_val = (1 << chan->scan_type.realbits);  in ad5764_write_raw()
193 			return -EINVAL;  in ad5764_write_raw()
194 		val <<= chan->scan_type.shift;  in ad5764_write_raw()
197 		if (val >= 128 || val < -128)  in ad5764_write_raw()
198 			return -EINVAL;  in ad5764_write_raw()
201 		if (val >= 32 || val < -32)  in ad5764_write_raw()
202 			return -EINVAL;  in ad5764_write_raw()
205 		return -EINVAL;  in ad5764_write_raw()
215 	if (st->chip_info->int_vref)  in ad5764_get_channel_vref()
216 		return st->chip_info->int_vref;  in ad5764_get_channel_vref()
218 		return regulator_get_voltage(st->vref_reg[channel / 2].consumer);  in ad5764_get_channel_vref()
231 		reg = AD5764_REG_DATA(chan->address);  in ad5764_read_raw()
235 		*val >>= chan->scan_type.shift;  in ad5764_read_raw()
238 		reg = AD5764_REG_OFFSET(chan->address);  in ad5764_read_raw()
245 		reg = AD5764_REG_FINE_GAIN(chan->address);  in ad5764_read_raw()
252 		/* vout = 4 * vref + ((dac_code / 65536) - 0.5) */  in ad5764_read_raw()
253 		vref = ad5764_get_channel_vref(st, chan->channel);  in ad5764_read_raw()
258 		*val2 = chan->scan_type.realbits;  in ad5764_read_raw()
261 		*val = -(1 << chan->scan_type.realbits) / 2;  in ad5764_read_raw()
265 	return -EINVAL;  in ad5764_read_raw()
275 	enum ad5764_type type = spi_get_device_id(spi)->driver_data;  in ad5764_probe()
280 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad5764_probe()
282 		dev_err(&spi->dev, "Failed to allocate iio device\n");  in ad5764_probe()
283 		return -ENOMEM;  in ad5764_probe()
289 	st->spi = spi;  in ad5764_probe()
290 	st->chip_info = &ad5764_chip_infos[type];  in ad5764_probe()
292 	indio_dev->name = spi_get_device_id(spi)->name;  in ad5764_probe()
293 	indio_dev->info = &ad5764_info;  in ad5764_probe()
294 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad5764_probe()
295 	indio_dev->num_channels = AD5764_NUM_CHANNELS;  in ad5764_probe()
296 	indio_dev->channels = st->chip_info->channels;  in ad5764_probe()
298 	mutex_init(&st->lock);  in ad5764_probe()
300 	if (st->chip_info->int_vref == 0) {  in ad5764_probe()
301 		st->vref_reg[0].supply = "vrefAB";  in ad5764_probe()
302 		st->vref_reg[1].supply = "vrefCD";  in ad5764_probe()
304 		ret = devm_regulator_bulk_get(&st->spi->dev,  in ad5764_probe()
305 			ARRAY_SIZE(st->vref_reg), st->vref_reg);  in ad5764_probe()
307 			dev_err(&spi->dev, "Failed to request vref regulators: %d\n",  in ad5764_probe()
312 		ret = regulator_bulk_enable(ARRAY_SIZE(st->vref_reg),  in ad5764_probe()
313 			st->vref_reg);  in ad5764_probe()
315 			dev_err(&spi->dev, "Failed to enable vref regulators: %d\n",  in ad5764_probe()
323 		dev_err(&spi->dev, "Failed to register iio device: %d\n", ret);  in ad5764_probe()
330 	if (st->chip_info->int_vref == 0)  in ad5764_probe()
331 		regulator_bulk_disable(ARRAY_SIZE(st->vref_reg), st->vref_reg);  in ad5764_probe()
342 	if (st->chip_info->int_vref == 0)  in ad5764_remove()
343 		regulator_bulk_disable(ARRAY_SIZE(st->vref_reg), st->vref_reg);  in ad5764_remove()
365 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");