Patch "iio: inv-mpu: Specify the expected format/precision for write channels" has been added to the 4.1-stable tree

This is a note to let you know that I've just added the patch titled

iio: inv-mpu: Specify the expected format/precision for write channels

to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
iio-inv-mpu-specify-the-expected-format-precision-for-write-channels.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Adriana Reus <[email protected]>
Date: Fri, 12 Jun 2015 18:10:23 +0300
Subject: iio: inv-mpu: Specify the expected format/precision for write channels

From: Adriana Reus <[email protected]>

commit 6a3c45bb5a385be7049a7725a4fe93eaa76915f4 upstream.

The gyroscope needs IIO_VAL_INT_PLUS_NANO for the scale channel and unless specified write returns MICRO by default.
This needs to be properly specified so that write operations into scale have the expected behaviour.

---
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

@@ -431,6 +431,23 @@ static int inv_mpu6050_write_gyro_scale(
 	return -EINVAL;
 }
 
+static int inv_write_raw_get_fmt(struct iio_dev *indio_dev,
+				 struct iio_chan_spec const *chan, long mask)
+{
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_ANGL_VEL:
+			return IIO_VAL_INT_PLUS_NANO;
+		default:
+			return IIO_VAL_INT_PLUS_MICRO;
+		}
+	default:
+		return IIO_VAL_INT_PLUS_MICRO;
+	}
+
+	return -EINVAL;
+}
 static int inv_mpu6050_write_accel_scale(struct inv_mpu6050_state *st, int val)
 {
 	int result, i;

@@ -696,6 +713,7 @@ static const struct iio_info mpu_info =
 	.driver_module = THIS_MODULE,
 	.read_raw = &inv_mpu6050_read_raw,
 	.write_raw = &inv_mpu6050_write_raw,
+	.write_raw_get_fmt = &inv_write_raw_get_fmt,
 	.attrs = &inv_attribute_group,
 	.validate_trigger = inv_mpu6050_validate_trigger,
 };

Patches currently in stable-queue which might be from [email protected] are

queue-4.1/iio-inv-mpu-specify-the-expected-format-precision-for-write-channels.patch