1 // SPDX-License-Identifier: GPL-2.0-only
36 	 * transfer buffers to live in their own cache line.
39 	__be16 rx_buf[5]; /* First 16-bits are trash */
42 #define ADC084S021_VOLTAGE_CHANNEL(num)                  \  argument
45 		.channel = (num),                                    \
47 		.scan_index = (num),                                 \
68  * adc084s021_adc_conversion() - Read an ADC channel and return its value.
75 	int n_words = (adc->spi_trans.len >> 1) - 1; /* Discard first word */  in adc084s021_adc_conversion()
78 	/* Do the transfer */  in adc084s021_adc_conversion()
79 	ret = spi_sync(adc->spi, &adc->message);  in adc084s021_adc_conversion()
84 		*(data + i) = adc->rx_buf[i + 1];  in adc084s021_adc_conversion()
100 			return -EBUSY;  in adc084s021_read_raw()
102 		ret = regulator_enable(adc->reg);  in adc084s021_read_raw()
108 		adc->tx_buf[0] = channel->channel << 3;  in adc084s021_read_raw()
111 		regulator_disable(adc->reg);  in adc084s021_read_raw()
116 		*val = (*val >> channel->scan_type.shift) & 0xff;  in adc084s021_read_raw()
120 		ret = regulator_enable(adc->reg);  in adc084s021_read_raw()
124 		ret = regulator_get_voltage(adc->reg);  in adc084s021_read_raw()
125 		regulator_disable(adc->reg);  in adc084s021_read_raw()
133 		return -EINVAL;  in adc084s021_read_raw()
138  * adc084s021_buffer_trigger_handler() - Read ADC channels and push to buffer.
146 	struct iio_dev *indio_dev = pf->indio_dev;  in adc084s021_buffer_trigger_handler()
149 	mutex_lock(&adc->lock);  in adc084s021_buffer_trigger_handler()
151 	if (adc084s021_adc_conversion(adc, adc->scan.channels) < 0)  in adc084s021_buffer_trigger_handler()
152 		dev_err(&adc->spi->dev, "Failed to read data\n");  in adc084s021_buffer_trigger_handler()
154 	iio_push_to_buffers_with_ts(indio_dev, &adc->scan, sizeof(adc->scan),  in adc084s021_buffer_trigger_handler()
156 	mutex_unlock(&adc->lock);  in adc084s021_buffer_trigger_handler()
157 	iio_trigger_notify_done(indio_dev->trig);  in adc084s021_buffer_trigger_handler()
170 			&indio_dev->channels[scan_index];  in adc084s021_buffer_preenable()
171 		adc->tx_buf[i++] = channel->channel << 3;  in adc084s021_buffer_preenable()
173 	adc->spi_trans.len = 2 + (i * sizeof(__be16)); /* Trash + channels */  in adc084s021_buffer_preenable()
175 	return regulator_enable(adc->reg);  in adc084s021_buffer_preenable()
182 	adc->spi_trans.len = 4; /* Trash + single channel */  in adc084s021_buffer_postdisable()
184 	return regulator_disable(adc->reg);  in adc084s021_buffer_postdisable()
202 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));  in adc084s021_probe()
204 		dev_err(&spi->dev, "Failed to allocate IIO device\n");  in adc084s021_probe()
205 		return -ENOMEM;  in adc084s021_probe()
209 	adc->spi = spi;  in adc084s021_probe()
212 	indio_dev->name = spi_get_device_id(spi)->name;  in adc084s021_probe()
213 	indio_dev->modes = INDIO_DIRECT_MODE;  in adc084s021_probe()
214 	indio_dev->info = &adc084s021_info;  in adc084s021_probe()
215 	indio_dev->channels = adc084s021_channels;  in adc084s021_probe()
216 	indio_dev->num_channels = ARRAY_SIZE(adc084s021_channels);  in adc084s021_probe()
218 	/* Create SPI transfer for channel reads */  in adc084s021_probe()
219 	adc->spi_trans.tx_buf = adc->tx_buf;  in adc084s021_probe()
220 	adc->spi_trans.rx_buf = adc->rx_buf;  in adc084s021_probe()
221 	adc->spi_trans.len = 4; /* Trash + single channel */  in adc084s021_probe()
222 	spi_message_init_with_transfers(&adc->message, &adc->spi_trans, 1);  in adc084s021_probe()
224 	adc->reg = devm_regulator_get(&spi->dev, "vref");  in adc084s021_probe()
225 	if (IS_ERR(adc->reg))  in adc084s021_probe()
226 		return PTR_ERR(adc->reg);  in adc084s021_probe()
228 	mutex_init(&adc->lock);  in adc084s021_probe()
231 	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, NULL,  in adc084s021_probe()
235 		dev_err(&spi->dev, "Failed to setup triggered buffer\n");  in adc084s021_probe()
239 	return devm_iio_device_register(&spi->dev, indio_dev);  in adc084s021_probe()