linux-kernel - [PATCH v3 27/27] staging: iio: resolver: ad2s1210: add label attribute support

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Message-ID: <20230929-ad2s1210-mainline-v3-27-fa4364281745@baylibre.com>
Date:   Fri, 29 Sep 2023 12:23:32 -0500
From:   David Lechner <dlechner@...libre.com>
To:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-staging@...ts.linux.dev
Cc:     David Lechner <david@...hnology.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Axel Haslam <ahaslam@...libre.com>,
        Philip Molloy <pmolloy@...libre.com>,
        linux-kernel@...r.kernel.org, David Lechner <dlechner@...libre.com>
Subject: [PATCH v3 27/27] staging: iio: resolver: ad2s1210: add label attribute support

From: David Lechner <david@...hnology.com>

From: David Lechner <dlechner@...libre.com>

The ad2s1210 resolver driver has quite a few channels, mostly for
internal signals for event support. This makes it difficult to know
which channel is which. This patch adds a label attribute to the
channels to make it easier to identify them.

Signed-off-by: David Lechner <dlechner@...libre.com>
---

v3 changes: This is a new patch in v3

 drivers/staging/iio/resolver/ad2s1210.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c
index dc3cc3ab855e..a187fa07d315 100644
--- a/drivers/staging/iio/resolver/ad2s1210.c
+++ b/drivers/staging/iio/resolver/ad2s1210.c
@@ -1106,6 +1106,34 @@ static int ad2s1210_initial(struct ad2s1210_state *st)
 	return ret;
 }
 
+static int ad2s1210_read_label(struct iio_dev *indio_dev,
+			       struct iio_chan_spec const *chan,
+			       char *label)
+{
+	if (chan->type == IIO_ANGL) {
+		if (chan->channel == 0)
+			return sprintf(label, "position\n");
+		if (chan->channel == 1)
+			return sprintf(label, "tracking error\n");
+	}
+	if (chan->type == IIO_ANGL_VEL)
+		return sprintf(label, "velocity\n");
+	if (chan->type == IIO_PHASE)
+		return sprintf(label, "synthetic reference\n");
+	if (chan->type == IIO_ALTVOLTAGE) {
+		if (chan->output)
+			return sprintf(label, "excitation\n");
+		if (chan->channel == 0)
+			return sprintf(label, "monitor signal\n");
+		if (chan->channel == 1 && chan->channel2 == IIO_MOD_X)
+			return sprintf(label, "cosine\n");
+		if (chan->channel == 1 && chan->channel2 == IIO_MOD_Y)
+			return sprintf(label, "sine\n");
+	}
+
+	return -EINVAL;
+}
+
 static int ad2s1210_read_event_value(struct iio_dev *indio_dev,
 				     const struct iio_chan_spec *chan,
 				     enum iio_event_type type,
@@ -1256,6 +1284,7 @@ static const struct iio_info ad2s1210_info = {
 	.read_raw = ad2s1210_read_raw,
 	.read_avail = ad2s1210_read_avail,
 	.write_raw = ad2s1210_write_raw,
+	.read_label = ad2s1210_read_label,
 	.attrs = &ad2s1210_attribute_group,
 	.read_event_value = ad2s1210_read_event_value,
 	.write_event_value = ad2s1210_write_event_value,

-- 
2.42.0