linux-kernel - [PATCH 3/4] iio: dac: adi-axi-dac: add data source get

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Message-Id: <20250321-wip-bl-ad3552r-fixes-v1-3-3c1aa249d163@baylibre.com>
Date: Fri, 21 Mar 2025 21:28:50 +0100
From: Angelo Dureghello <adureghello@...libre.com>
To: Nuno Sá <nuno.sa@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>, 
 Jonathan Corbet <corbet@....net>, 
 Olivier Moysan <olivier.moysan@...s.st.com>, 
 Michael Hennerich <Michael.Hennerich@...log.com>
Cc: linux-iio@...r.kernel.org, linux-doc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Angelo Dureghello <adureghello@...libre.com>
Subject: [PATCH 3/4] iio: dac: adi-axi-dac: add data source get

From: Angelo Dureghello <adureghello@...libre.com>

Add data source getter.

Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
---
 drivers/iio/dac/adi-axi-dac.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c
index 892d770aec69c4259de777058801c9ab33c79923..a6abd828ebdb34800cc08a2151e52a9acda9eba1 100644
--- a/drivers/iio/dac/adi-axi-dac.c
+++ b/drivers/iio/dac/adi-axi-dac.c
@@ -514,6 +514,32 @@ static int axi_dac_data_source_set(struct iio_backend *back, unsigned int chan,
 	}
 }
 
+static int axi_dac_data_source_get(struct iio_backend *back, unsigned int chan,
+				   enum iio_backend_data_source *data)
+{
+	struct axi_dac_state *st = iio_backend_get_priv(back);
+	int ret;
+	u32 val;
+
+	ret = regmap_read(st->regmap, AXI_DAC_CHAN_CNTRL_7_REG(chan), &val);
+	if (ret)
+		return ret;
+
+	switch (val) {
+	case AXI_DAC_DATA_INTERNAL_TONE:
+		*data = IIO_BACKEND_INTERNAL_CONTINUOUS_WAVE;
+		return 0;
+	case AXI_DAC_DATA_DMA:
+		*data = IIO_BACKEND_EXTERNAL;
+		return 0;
+	case AXI_DAC_DATA_INTERNAL_RAMP_16BIT:
+		*data = IIO_BACKEND_INTERNAL_RAMP_16BIT;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
 static int axi_dac_set_sample_rate(struct iio_backend *back, unsigned int chan,
 				   u64 sample_rate)
 {
@@ -794,6 +820,7 @@ static const struct iio_backend_ops axi_ad3552r_ops = {
 	.request_buffer = axi_dac_request_buffer,
 	.free_buffer = axi_dac_free_buffer,
 	.data_source_set = axi_dac_data_source_set,
+	.data_source_get = axi_dac_data_source_get,
 	.ddr_enable = axi_dac_ddr_enable,
 	.ddr_disable = axi_dac_ddr_disable,
 	.data_stream_enable = axi_dac_data_stream_enable,

-- 
2.49.0