1 // SPDX-License-Identifier: GPL-2.0-only
29 #define AD7298_CH(x)	BIT(13 - (x)) /* channel select */
82 		.scan_index = -1,
115 	command = AD7298_WRITE | st->ext_ref;  in ad7298_update_scan_mode()
121 	st->tx_buf[0] = cpu_to_be16(command);  in ad7298_update_scan_mode()
124 	st->ring_xfer[0].tx_buf = &st->tx_buf[0];  in ad7298_update_scan_mode()
125 	st->ring_xfer[0].len = 2;  in ad7298_update_scan_mode()
126 	st->ring_xfer[0].cs_change = 1;  in ad7298_update_scan_mode()
127 	st->ring_xfer[1].tx_buf = &st->tx_buf[1];  in ad7298_update_scan_mode()
128 	st->ring_xfer[1].len = 2;  in ad7298_update_scan_mode()
129 	st->ring_xfer[1].cs_change = 1;  in ad7298_update_scan_mode()
131 	spi_message_init(&st->ring_msg);  in ad7298_update_scan_mode()
132 	spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg);  in ad7298_update_scan_mode()
133 	spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg);  in ad7298_update_scan_mode()
136 		st->ring_xfer[i + 2].rx_buf = &st->rx_buf[i];  in ad7298_update_scan_mode()
137 		st->ring_xfer[i + 2].len = 2;  in ad7298_update_scan_mode()
138 		st->ring_xfer[i + 2].cs_change = 1;  in ad7298_update_scan_mode()
139 		spi_message_add_tail(&st->ring_xfer[i + 2], &st->ring_msg);  in ad7298_update_scan_mode()
142 	st->ring_xfer[i + 1].cs_change = 0;  in ad7298_update_scan_mode()
147 static irqreturn_t ad7298_trigger_handler(int irq, void *p)  in ad7298_trigger_handler()  argument
149 	struct iio_poll_func *pf = p;  in ad7298_trigger_handler()
150 	struct iio_dev *indio_dev = pf->indio_dev;  in ad7298_trigger_handler()
154 	b_sent = spi_sync(st->spi, &st->ring_msg);  in ad7298_trigger_handler()
158 	iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,  in ad7298_trigger_handler()
162 	iio_trigger_notify_done(indio_dev->trig);  in ad7298_trigger_handler()
170 	st->tx_buf[0] = cpu_to_be16(AD7298_WRITE | st->ext_ref |  in ad7298_scan_direct()
173 	ret = spi_sync(st->spi, &st->scan_single_msg);  in ad7298_scan_direct()
177 	return be16_to_cpu(st->rx_buf[0]);  in ad7298_scan_direct()
186 			  AD7298_TAVG | st->ext_ref);  in ad7298_scan_temp()
188 	ret = spi_write(st->spi, (u8 *)&buf, 2);  in ad7298_scan_temp()
194 	ret = spi_write(st->spi, (u8 *)&buf, 2);  in ad7298_scan_temp()
200 	ret = spi_read(st->spi, (u8 *)&buf, 2);  in ad7298_scan_temp()
211 	int vref;  in ad7298_get_ref_voltage()  local
213 	if (st->reg) {  in ad7298_get_ref_voltage()
214 		vref = regulator_get_voltage(st->reg);  in ad7298_get_ref_voltage()
215 		if (vref < 0)  in ad7298_get_ref_voltage()
216 			return vref;  in ad7298_get_ref_voltage()
218 		return vref / 1000;  in ad7298_get_ref_voltage()
239 		if (chan->address == AD7298_CH_TEMP)  in ad7298_read_raw()
242 			ret = ad7298_scan_direct(st, chan->address);  in ad7298_read_raw()
249 		if (chan->address != AD7298_CH_TEMP)  in ad7298_read_raw()
250 			*val = ret & GENMASK(chan->scan_type.realbits - 1, 0);  in ad7298_read_raw()
254 		switch (chan->type) {  in ad7298_read_raw()
257 			*val2 = chan->scan_type.realbits;  in ad7298_read_raw()
264 			return -EINVAL;  in ad7298_read_raw()
267 		*val = 1093 - 2732500 / ad7298_get_ref_voltage(st);  in ad7298_read_raw()
270 	return -EINVAL;  in ad7298_read_raw()
291 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad7298_probe()
293 		return -ENOMEM;  in ad7298_probe()
297 	st->reg = devm_regulator_get_optional(&spi->dev, "vref");  in ad7298_probe()
298 	if (!IS_ERR(st->reg)) {  in ad7298_probe()
299 		st->ext_ref = AD7298_EXTREF;  in ad7298_probe()
301 		ret = PTR_ERR(st->reg);  in ad7298_probe()
302 		if (ret != -ENODEV)  in ad7298_probe()
305 		st->reg = NULL;  in ad7298_probe()
308 	if (st->reg) {  in ad7298_probe()
309 		ret = regulator_enable(st->reg);  in ad7298_probe()
313 		ret = devm_add_action_or_reset(&spi->dev, ad7298_reg_disable,  in ad7298_probe()
314 					       st->reg);  in ad7298_probe()
319 	st->spi = spi;  in ad7298_probe()
321 	indio_dev->name = spi_get_device_id(spi)->name;  in ad7298_probe()
322 	indio_dev->modes = INDIO_DIRECT_MODE;  in ad7298_probe()
323 	indio_dev->channels = ad7298_channels;  in ad7298_probe()
324 	indio_dev->num_channels = ARRAY_SIZE(ad7298_channels);  in ad7298_probe()
325 	indio_dev->info = &ad7298_info;  in ad7298_probe()
329 	st->scan_single_xfer[0].tx_buf = &st->tx_buf[0];  in ad7298_probe()
330 	st->scan_single_xfer[0].len = 2;  in ad7298_probe()
331 	st->scan_single_xfer[0].cs_change = 1;  in ad7298_probe()
332 	st->scan_single_xfer[1].tx_buf = &st->tx_buf[1];  in ad7298_probe()
333 	st->scan_single_xfer[1].len = 2;  in ad7298_probe()
334 	st->scan_single_xfer[1].cs_change = 1;  in ad7298_probe()
335 	st->scan_single_xfer[2].rx_buf = &st->rx_buf[0];  in ad7298_probe()
336 	st->scan_single_xfer[2].len = 2;  in ad7298_probe()
338 	spi_message_init(&st->scan_single_msg);  in ad7298_probe()
339 	spi_message_add_tail(&st->scan_single_xfer[0], &st->scan_single_msg);  in ad7298_probe()
340 	spi_message_add_tail(&st->scan_single_xfer[1], &st->scan_single_msg);  in ad7298_probe()
341 	spi_message_add_tail(&st->scan_single_xfer[2], &st->scan_single_msg);  in ad7298_probe()
343 	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, NULL,  in ad7298_probe()
348 	return devm_iio_device_register(&spi->dev, indio_dev);  in ad7298_probe()