iio/adc/ad7298.c

106 	struct ad7298_state *st = iio_priv(indio_dev);
115 	command = AD7298_WRITE | st->ext_ref;
121 	st->tx_buf[0] = cpu_to_be16(command);
124 	st->ring_xfer[0].tx_buf = &st->tx_buf[0];
125 	st->ring_xfer[0].len = 2;
126 	st->ring_xfer[0].cs_change = 1;
127 	st->ring_xfer[1].tx_buf = &st->tx_buf[1];
128 	st->ring_xfer[1].len = 2;
129 	st->ring_xfer[1].cs_change = 1;
131 	spi_message_init(&st->ring_msg);
132 	spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg);
133 	spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg);
136 		st->ring_xfer[i + 2].rx_buf = &st->rx_buf[i];
137 		st->ring_xfer[i + 2].len = 2;
138 		st->ring_xfer[i + 2].cs_change = 1;
139 		spi_message_add_tail(&st->ring_xfer[i + 2], &st->ring_msg);
142 	st->ring_xfer[i + 1].cs_change = 0;
151 	struct ad7298_state *st = iio_priv(indio_dev);
154 	b_sent = spi_sync(st->spi, &st->ring_msg);
158 	iio_push_to_buffers_with_ts(indio_dev, st->rx_buf, sizeof(st->rx_buf),
167 static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch)
170 	st->tx_buf[0] = cpu_to_be16(AD7298_WRITE | st->ext_ref |
173 	ret = spi_sync(st->spi, &st->scan_single_msg);
177 	return be16_to_cpu(st->rx_buf[0]);
180 static int ad7298_scan_temp(struct ad7298_state *st, int *val)
186 			  AD7298_TAVG | st->ext_ref);
188 	ret = spi_write(st->spi, (u8 *)&buf, 2);
194 	ret = spi_write(st->spi, (u8 *)&buf, 2);
200 	ret = spi_read(st->spi, (u8 *)&buf, 2);
209 static int ad7298_get_ref_voltage(struct ad7298_state *st)
213 	if (st->reg) {
214 		vref = regulator_get_voltage(st->reg);
231 	struct ad7298_state *st = iio_priv(indio_dev);
239 			ret = ad7298_scan_temp(st, val);
241 			ret = ad7298_scan_direct(st, chan->address);
255 			*val = ad7298_get_ref_voltage(st);
259 			*val = ad7298_get_ref_voltage(st);
266 		*val = 1093 - 2732500 / ad7298_get_ref_voltage(st);
286 	struct ad7298_state *st;
290 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
294 	st = iio_priv(indio_dev);
296 	st->reg = devm_regulator_get_optional(&spi->dev, "vref");
297 	if (!IS_ERR(st->reg)) {
298 		st->ext_ref = AD7298_EXTREF;
300 		ret = PTR_ERR(st->reg);
304 		st->reg = NULL;
307 	if (st->reg) {
308 		ret = regulator_enable(st->reg);
313 					       st->reg);
318 	st->spi = spi;
328 	st->scan_single_xfer[0].tx_buf = &st->tx_buf[0];
329 	st->scan_single_xfer[0].len = 2;
330 	st->scan_single_xfer[0].cs_change = 1;
331 	st->scan_single_xfer[1].tx_buf = &st->tx_buf[1];
332 	st->scan_single_xfer[1].len = 2;
333 	st->scan_single_xfer[1].cs_change = 1;
334 	st->scan_single_xfer[2].rx_buf = &st->rx_buf[0];
335 	st->scan_single_xfer[2].len = 2;
337 	spi_message_init(&st->scan_single_msg);
338 	spi_message_add_tail(&st->scan_single_xfer[0], &st->scan_single_msg);
339 	spi_message_add_tail(&st->scan_single_xfer[1], &st->scan_single_msg);
340 	spi_message_add_tail(&st->scan_single_xfer[2], &st->scan_single_msg);