107 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_update_scan_mode()  local
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()
157 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_trigger_handler()  local
160 	b_sent = spi_sync(st->spi, &st->ring_msg);  in ad7298_trigger_handler()
164 	iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,  in ad7298_trigger_handler()
173 static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch)  in ad7298_scan_direct()  argument
176 	st->tx_buf[0] = cpu_to_be16(AD7298_WRITE | st->ext_ref |  in ad7298_scan_direct()
179 	ret = spi_sync(st->spi, &st->scan_single_msg);  in ad7298_scan_direct()
183 	return be16_to_cpu(st->rx_buf[0]);  in ad7298_scan_direct()
186 static int ad7298_scan_temp(struct ad7298_state *st, int *val)  in ad7298_scan_temp()  argument
192 			  AD7298_TAVG | st->ext_ref);  in ad7298_scan_temp()
194 	ret = spi_write(st->spi, (u8 *)&buf, 2);  in ad7298_scan_temp()
200 	ret = spi_write(st->spi, (u8 *)&buf, 2);  in ad7298_scan_temp()
206 	ret = spi_read(st->spi, (u8 *)&buf, 2);  in ad7298_scan_temp()
215 static int ad7298_get_ref_voltage(struct ad7298_state *st)  in ad7298_get_ref_voltage()  argument
219 	if (st->ext_ref) {  in ad7298_get_ref_voltage()
220 		vref = regulator_get_voltage(st->reg);  in ad7298_get_ref_voltage()
237 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_read_raw()  local
246 			ret = ad7298_scan_temp(st, val);  in ad7298_read_raw()
248 			ret = ad7298_scan_direct(st, chan->address);  in ad7298_read_raw()
262 			*val = ad7298_get_ref_voltage(st);  in ad7298_read_raw()
266 			*val = ad7298_get_ref_voltage(st);  in ad7298_read_raw()
273 		*val = 1093 - 2732500 / ad7298_get_ref_voltage(st);  in ad7298_read_raw()
287 	struct ad7298_state *st;  in ad7298_probe()  local
291 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad7298_probe()
295 	st = iio_priv(indio_dev);  in ad7298_probe()
298 		st->ext_ref = AD7298_EXTREF;  in ad7298_probe()
300 	if (st->ext_ref) {  in ad7298_probe()
301 		st->reg = devm_regulator_get(&spi->dev, "vref");  in ad7298_probe()
302 		if (IS_ERR(st->reg))  in ad7298_probe()
303 			return PTR_ERR(st->reg);  in ad7298_probe()
305 		ret = regulator_enable(st->reg);  in ad7298_probe()
312 	st->spi = spi;  in ad7298_probe()
322 	st->scan_single_xfer[0].tx_buf = &st->tx_buf[0];  in ad7298_probe()
323 	st->scan_single_xfer[0].len = 2;  in ad7298_probe()
324 	st->scan_single_xfer[0].cs_change = 1;  in ad7298_probe()
325 	st->scan_single_xfer[1].tx_buf = &st->tx_buf[1];  in ad7298_probe()
326 	st->scan_single_xfer[1].len = 2;  in ad7298_probe()
327 	st->scan_single_xfer[1].cs_change = 1;  in ad7298_probe()
328 	st->scan_single_xfer[2].rx_buf = &st->rx_buf[0];  in ad7298_probe()
329 	st->scan_single_xfer[2].len = 2;  in ad7298_probe()
331 	spi_message_init(&st->scan_single_msg);  in ad7298_probe()
332 	spi_message_add_tail(&st->scan_single_xfer[0], &st->scan_single_msg);  in ad7298_probe()
333 	spi_message_add_tail(&st->scan_single_xfer[1], &st->scan_single_msg);  in ad7298_probe()
334 	spi_message_add_tail(&st->scan_single_xfer[2], &st->scan_single_msg);  in ad7298_probe()
350 	if (st->ext_ref)  in ad7298_probe()
351 		regulator_disable(st->reg);  in ad7298_probe()
359 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_remove()  local
363 	if (st->ext_ref)  in ad7298_remove()
364 		regulator_disable(st->reg);  in ad7298_remove()