108 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_update_scan_mode()  local
116 	command = AD7298_WRITE | st->ext_ref;  in ad7298_update_scan_mode()
122 	st->tx_buf[0] = cpu_to_be16(command);  in ad7298_update_scan_mode()
125 	st->ring_xfer[0].tx_buf = &st->tx_buf[0];  in ad7298_update_scan_mode()
126 	st->ring_xfer[0].len = 2;  in ad7298_update_scan_mode()
127 	st->ring_xfer[0].cs_change = 1;  in ad7298_update_scan_mode()
128 	st->ring_xfer[1].tx_buf = &st->tx_buf[1];  in ad7298_update_scan_mode()
129 	st->ring_xfer[1].len = 2;  in ad7298_update_scan_mode()
130 	st->ring_xfer[1].cs_change = 1;  in ad7298_update_scan_mode()
132 	spi_message_init(&st->ring_msg);  in ad7298_update_scan_mode()
133 	spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg);  in ad7298_update_scan_mode()
134 	spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg);  in ad7298_update_scan_mode()
137 		st->ring_xfer[i + 2].rx_buf = &st->rx_buf[i];  in ad7298_update_scan_mode()
138 		st->ring_xfer[i + 2].len = 2;  in ad7298_update_scan_mode()
139 		st->ring_xfer[i + 2].cs_change = 1;  in ad7298_update_scan_mode()
140 		spi_message_add_tail(&st->ring_xfer[i + 2], &st->ring_msg);  in ad7298_update_scan_mode()
143 	st->ring_xfer[i + 1].cs_change = 0;  in ad7298_update_scan_mode()
158 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_trigger_handler()  local
161 	b_sent = spi_sync(st->spi, &st->ring_msg);  in ad7298_trigger_handler()
165 	iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,  in ad7298_trigger_handler()
174 static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch)  in ad7298_scan_direct()  argument
177 	st->tx_buf[0] = cpu_to_be16(AD7298_WRITE | st->ext_ref |  in ad7298_scan_direct()
180 	ret = spi_sync(st->spi, &st->scan_single_msg);  in ad7298_scan_direct()
184 	return be16_to_cpu(st->rx_buf[0]);  in ad7298_scan_direct()
187 static int ad7298_scan_temp(struct ad7298_state *st, int *val)  in ad7298_scan_temp()  argument
193 			  AD7298_TAVG | st->ext_ref);  in ad7298_scan_temp()
195 	ret = spi_write(st->spi, (u8 *)&buf, 2);  in ad7298_scan_temp()
201 	ret = spi_write(st->spi, (u8 *)&buf, 2);  in ad7298_scan_temp()
207 	ret = spi_read(st->spi, (u8 *)&buf, 2);  in ad7298_scan_temp()
216 static int ad7298_get_ref_voltage(struct ad7298_state *st)  in ad7298_get_ref_voltage()  argument
220 	if (st->ext_ref) {  in ad7298_get_ref_voltage()
221 		vref = regulator_get_voltage(st->reg);  in ad7298_get_ref_voltage()
238 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_read_raw()  local
247 				ret = ad7298_scan_temp(st, val);  in ad7298_read_raw()
249 				ret = ad7298_scan_direct(st, chan->address);  in ad7298_read_raw()
263 			*val = ad7298_get_ref_voltage(st);  in ad7298_read_raw()
267 			*val = ad7298_get_ref_voltage(st);  in ad7298_read_raw()
274 		*val = 1093 - 2732500 / ad7298_get_ref_voltage(st);  in ad7298_read_raw()
289 	struct ad7298_state *st;  in ad7298_probe()  local
293 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));  in ad7298_probe()
297 	st = iio_priv(indio_dev);  in ad7298_probe()
300 		st->ext_ref = AD7298_EXTREF;  in ad7298_probe()
302 	if (st->ext_ref) {  in ad7298_probe()
303 		st->reg = devm_regulator_get(&spi->dev, "vref");  in ad7298_probe()
304 		if (IS_ERR(st->reg))  in ad7298_probe()
305 			return PTR_ERR(st->reg);  in ad7298_probe()
307 		ret = regulator_enable(st->reg);  in ad7298_probe()
314 	st->spi = spi;  in ad7298_probe()
325 	st->scan_single_xfer[0].tx_buf = &st->tx_buf[0];  in ad7298_probe()
326 	st->scan_single_xfer[0].len = 2;  in ad7298_probe()
327 	st->scan_single_xfer[0].cs_change = 1;  in ad7298_probe()
328 	st->scan_single_xfer[1].tx_buf = &st->tx_buf[1];  in ad7298_probe()
329 	st->scan_single_xfer[1].len = 2;  in ad7298_probe()
330 	st->scan_single_xfer[1].cs_change = 1;  in ad7298_probe()
331 	st->scan_single_xfer[2].rx_buf = &st->rx_buf[0];  in ad7298_probe()
332 	st->scan_single_xfer[2].len = 2;  in ad7298_probe()
334 	spi_message_init(&st->scan_single_msg);  in ad7298_probe()
335 	spi_message_add_tail(&st->scan_single_xfer[0], &st->scan_single_msg);  in ad7298_probe()
336 	spi_message_add_tail(&st->scan_single_xfer[1], &st->scan_single_msg);  in ad7298_probe()
337 	spi_message_add_tail(&st->scan_single_xfer[2], &st->scan_single_msg);  in ad7298_probe()
353 	if (st->ext_ref)  in ad7298_probe()
354 		regulator_disable(st->reg);  in ad7298_probe()
362 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_remove()  local
366 	if (st->ext_ref)  in ad7298_remove()
367 		regulator_disable(st->reg);  in ad7298_remove()