linux-kernel - [PATCH v3 1/2] iio: pressure: ms5611: Add IIO_CHAN_INFO

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Message-Id: <1454518238-7242-2-git-send-email-daniel.baluta@intel.com>
Date:	Wed,  3 Feb 2016 18:50:37 +0200
From:	Daniel Baluta <daniel.baluta@...el.com>
To:	jic23@...nel.org
Cc:	knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	daniel.baluta@...el.com, lucas.demarchi@...el.com
Subject: [PATCH v3 1/2] iio: pressure: ms5611: Add IIO_CHAN_INFO_SCALE to mask

This allows data exported via buffer interface to be converted
to standard units in userspace.

Signed-off-by: Daniel Baluta <daniel.baluta@...el.com>
---
 drivers/iio/pressure/ms5611_core.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/pressure/ms5611_core.c b/drivers/iio/pressure/ms5611_core.c
index 2f3d9b4..6cf0e55 100644
--- a/drivers/iio/pressure/ms5611_core.c
+++ b/drivers/iio/pressure/ms5611_core.c
@@ -201,6 +201,18 @@ static int ms5611_read_raw(struct iio_dev *indio_dev,
 		default:
 			return -EINVAL;
 		}
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_TEMP:
+			*val = 10;
+			return IIO_VAL_INT;
+		case IIO_PRESSURE:
+			*val = 0;
+			*val2 = 1000;
+			return IIO_VAL_INT_PLUS_MICRO;
+		default:
+			return -EINVAL;
+		}
 	}
 
 	return -EINVAL;
@@ -218,11 +230,13 @@ static struct ms5611_chip_info chip_info_tbl[] = {
 static const struct iio_chan_spec ms5611_channels[] = {
 	{
 		.type = IIO_PRESSURE,
-		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+			BIT(IIO_CHAN_INFO_SCALE),
 	},
 	{
 		.type = IIO_TEMP,
-		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+			BIT(IIO_CHAN_INFO_SCALE),
 	}
 };
 
-- 
2.5.0