106 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_update_scan_mode()  local
114 	command = AD7298_WRITE | st->ext_ref;  in ad7298_update_scan_mode()
120 	st->tx_buf[0] = cpu_to_be16(command);  in ad7298_update_scan_mode()
123 	st->ring_xfer[0].tx_buf = &st->tx_buf[0];  in ad7298_update_scan_mode()
124 	st->ring_xfer[0].len = 2;  in ad7298_update_scan_mode()
125 	st->ring_xfer[0].cs_change = 1;  in ad7298_update_scan_mode()
126 	st->ring_xfer[1].tx_buf = &st->tx_buf[1];  in ad7298_update_scan_mode()
127 	st->ring_xfer[1].len = 2;  in ad7298_update_scan_mode()
128 	st->ring_xfer[1].cs_change = 1;  in ad7298_update_scan_mode()
130 	spi_message_init(&st->ring_msg);  in ad7298_update_scan_mode()
131 	spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg);  in ad7298_update_scan_mode()
132 	spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg);  in ad7298_update_scan_mode()
135 		st->ring_xfer[i + 2].rx_buf = &st->rx_buf[i];  in ad7298_update_scan_mode()
136 		st->ring_xfer[i + 2].len = 2;  in ad7298_update_scan_mode()
137 		st->ring_xfer[i + 2].cs_change = 1;  in ad7298_update_scan_mode()
138 		spi_message_add_tail(&st->ring_xfer[i + 2], &st->ring_msg);  in ad7298_update_scan_mode()
141 	st->ring_xfer[i + 1].cs_change = 0;  in ad7298_update_scan_mode()
150 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_trigger_handler()  local
153 	b_sent = spi_sync(st->spi, &st->ring_msg);  in ad7298_trigger_handler()
157 	iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,  in ad7298_trigger_handler()
166 static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch)  in ad7298_scan_direct()  argument
169 	st->tx_buf[0] = cpu_to_be16(AD7298_WRITE | st->ext_ref |  in ad7298_scan_direct()
172 	ret = spi_sync(st->spi, &st->scan_single_msg);  in ad7298_scan_direct()
176 	return be16_to_cpu(st->rx_buf[0]);  in ad7298_scan_direct()
179 static int ad7298_scan_temp(struct ad7298_state *st, int *val)  in ad7298_scan_temp()  argument
185 			  AD7298_TAVG | st->ext_ref);  in ad7298_scan_temp()
187 	ret = spi_write(st->spi, (u8 *)&buf, 2);  in ad7298_scan_temp()
193 	ret = spi_write(st->spi, (u8 *)&buf, 2);  in ad7298_scan_temp()
199 	ret = spi_read(st->spi, (u8 *)&buf, 2);  in ad7298_scan_temp()
208 static int ad7298_get_ref_voltage(struct ad7298_state *st)  in ad7298_get_ref_voltage()  argument
212 	if (st->reg) {  in ad7298_get_ref_voltage()
213 		vref = regulator_get_voltage(st->reg);  in ad7298_get_ref_voltage()
230 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_read_raw()  local
239 			ret = ad7298_scan_temp(st, val);  in ad7298_read_raw()
241 			ret = ad7298_scan_direct(st, chan->address);  in ad7298_read_raw()
255 			*val = ad7298_get_ref_voltage(st);  in ad7298_read_raw()
259 			*val = ad7298_get_ref_voltage(st);  in ad7298_read_raw()
266 		*val = 1093 - 2732500 / ad7298_get_ref_voltage(st);  in ad7298_read_raw()
286 	struct ad7298_state *st;  in ad7298_probe()  local
290 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad7298_probe()
294 	st = iio_priv(indio_dev);  in ad7298_probe()
296 	st->reg = devm_regulator_get_optional(&spi->dev, "vref");  in ad7298_probe()
297 	if (!IS_ERR(st->reg)) {  in ad7298_probe()
298 		st->ext_ref = AD7298_EXTREF;  in ad7298_probe()
300 		ret = PTR_ERR(st->reg);  in ad7298_probe()
304 		st->reg = NULL;  in ad7298_probe()
307 	if (st->reg) {  in ad7298_probe()
308 		ret = regulator_enable(st->reg);  in ad7298_probe()
313 					       st->reg);  in ad7298_probe()
318 	st->spi = spi;  in ad7298_probe()
328 	st->scan_single_xfer[0].tx_buf = &st->tx_buf[0];  in ad7298_probe()
329 	st->scan_single_xfer[0].len = 2;  in ad7298_probe()
330 	st->scan_single_xfer[0].cs_change = 1;  in ad7298_probe()
331 	st->scan_single_xfer[1].tx_buf = &st->tx_buf[1];  in ad7298_probe()
332 	st->scan_single_xfer[1].len = 2;  in ad7298_probe()
333 	st->scan_single_xfer[1].cs_change = 1;  in ad7298_probe()
334 	st->scan_single_xfer[2].rx_buf = &st->rx_buf[0];  in ad7298_probe()
335 	st->scan_single_xfer[2].len = 2;  in ad7298_probe()
337 	spi_message_init(&st->scan_single_msg);  in ad7298_probe()
338 	spi_message_add_tail(&st->scan_single_xfer[0], &st->scan_single_msg);  in ad7298_probe()
339 	spi_message_add_tail(&st->scan_single_xfer[1], &st->scan_single_msg);  in ad7298_probe()
340 	spi_message_add_tail(&st->scan_single_xfer[2], &st->scan_single_msg);  in ad7298_probe()