32 #define AD7298_TAVG	BIT(1) /* temperature sensor averaging enable */
59 		.indexed = 1,						\
76 		.indexed = 1,
82 		.scan_index = -1,
90 	AD7298_V_CHAN(1),
106 	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()
117 	for (i = 0, m = AD7298_CH(0); i < AD7298_MAX_CHAN; i++, m >>= 1)  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()
151 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_trigger_handler()  local
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()
167 static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch)  in ad7298_scan_direct()  argument
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()
180 static int ad7298_scan_temp(struct ad7298_state *st, int *val)  in ad7298_scan_temp()  argument
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()
209 static int ad7298_get_ref_voltage(struct ad7298_state *st)  in ad7298_get_ref_voltage()  argument
213 	if (st->reg) {  in ad7298_get_ref_voltage()
214 		vref = regulator_get_voltage(st->reg);  in ad7298_get_ref_voltage()
231 	struct ad7298_state *st = iio_priv(indio_dev);  in ad7298_read_raw()  local
240 			ret = ad7298_scan_temp(st, val);  in ad7298_read_raw()
242 			ret = ad7298_scan_direct(st, chan->address);  in ad7298_read_raw()
250 			*val = ret & GENMASK(chan->scan_type.realbits - 1, 0);  in ad7298_read_raw()
256 			*val = ad7298_get_ref_voltage(st);  in ad7298_read_raw()
260 			*val = ad7298_get_ref_voltage(st);  in ad7298_read_raw()
267 		*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()
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()
305 		st->reg = NULL;  in ad7298_probe()
308 	if (st->reg) {  in ad7298_probe()
309 		ret = regulator_enable(st->reg);  in ad7298_probe()
314 					       st->reg);  in ad7298_probe()
319 	st->spi = spi;  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()