From: Victor Colombo <victorcolombo@gmail.com>
Date: Sat, 3 Nov 2018 22:49:47 +0000 (-0300)
Subject: staging:iio:ad2s90: Add IIO_CHAN_INFO_SCALE to channel spec and read_raw
X-Git-Tag: v5.4-rc1~1925^2~249^2~39
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ccba40e9f76f65a755f8da00d4e00f49883c7d52;p=platform%2Fkernel%2Flinux-rpi.git

staging:iio:ad2s90: Add IIO_CHAN_INFO_SCALE to channel spec and read_raw

This patch adds the IIO_CHAN_INFO_SCALE mask to ad2s90_chan and
implements the relative read behavior at ad2s90_read_raw.

Signed-off-by: Victor Colombo <victorcolombo@gmail.com>
Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---

diff --git a/drivers/staging/iio/resolver/ad2s90.c b/drivers/staging/iio/resolver/ad2s90.c
index 8f79cccf4814..9c168b7410d0 100644
--- a/drivers/staging/iio/resolver/ad2s90.c
+++ b/drivers/staging/iio/resolver/ad2s90.c
@@ -34,17 +34,29 @@ static int ad2s90_read_raw(struct iio_dev *indio_dev,
 	int ret;
 	struct ad2s90_state *st = iio_priv(indio_dev);
 
-	mutex_lock(&st->lock);
-	ret = spi_read(st->sdev, st->rx, 2);
-	if (ret < 0) {
+	switch (m) {
+	case IIO_CHAN_INFO_SCALE:
+		/* 2 * Pi / 2^12 */
+		*val = 6283; /* mV */
+		*val2 = 12;
+		return IIO_VAL_FRACTIONAL_LOG2;
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&st->lock);
+		ret = spi_read(st->sdev, st->rx, 2);
+		if (ret < 0) {
+			mutex_unlock(&st->lock);
+			return ret;
+		}
+		*val = (((u16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4);
+
 		mutex_unlock(&st->lock);
-		return ret;
-	}
-	*val = (((u16)(st->rx[0])) << 4) | ((st->rx[1] & 0xF0) >> 4);
 
-	mutex_unlock(&st->lock);
+		return IIO_VAL_INT;
+	default:
+		break;
+	}
 
-	return IIO_VAL_INT;
+	return -EINVAL;
 }
 
 static const struct iio_info ad2s90_info = {
@@ -55,7 +67,7 @@ static const struct iio_chan_spec ad2s90_chan = {
 	.type = IIO_ANGL,
 	.indexed = 1,
 	.channel = 0,
-	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
 };
 
 static int ad2s90_probe(struct spi_device *spi)