linux-kernel - [PATCH v3 1/2] iio: gts-helper: export iio_gts_get_total

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Message-Id: <20250127-veml6030-scale-v3-1-4f32ba03df94@gmail.com>
Date: Mon, 27 Jan 2025 20:30:22 +0100
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Jonathan Cameron <jic23@...nel.org>, 
 Lars-Peter Clausen <lars@...afoo.de>, Rishi Gupta <gupt21@...il.com>, 
 Matti Vaittinen <mazziesaccount@...il.com>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH v3 1/2] iio: gts-helper: export iio_gts_get_total_gain()

Export this function in preparation for the fix in veml6030.c, where the
total gain can be used to ease the calculation of the processed value of
the IIO_LIGHT channel compared to acquiring the scale in NANO.

Suggested-by: Matti Vaittinen <mazziesaccount@...il.com>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/iio/industrialio-gts-helper.c | 11 ++++++++++-
 include/linux/iio/iio-gts-helper.h    |  1 +
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/industrialio-gts-helper.c b/drivers/iio/industrialio-gts-helper.c
index 200364b42ead2f560b852fc2f533b4aa83302810..f35c36fd4a55f6d5f0f2ad0c0402cea8fab890b0 100644
--- a/drivers/iio/industrialio-gts-helper.c
+++ b/drivers/iio/industrialio-gts-helper.c
@@ -1026,7 +1026,15 @@ int iio_gts_find_gain_time_sel_for_scale(struct iio_gts *gts, int scale_int,
 }
 EXPORT_SYMBOL_NS_GPL(iio_gts_find_gain_time_sel_for_scale, "IIO_GTS_HELPER");
 
-static int iio_gts_get_total_gain(struct iio_gts *gts, int gain, int time)
+/**
+ * iio_gts_get_total_gain - Fetch total gain for given HW-gain and time
+ * @gts:	Gain time scale descriptor
+ * @gain:	HW-gain for which the total gain is searched for
+ * @time:	Integration time for which the total gain is searched for
+ *
+ * Return: total gain on success and -EINVAL on error.
+ */
+int iio_gts_get_total_gain(struct iio_gts *gts, int gain, int time)
 {
 	const struct iio_itime_sel_mul *itime;
 
@@ -1042,6 +1050,7 @@ static int iio_gts_get_total_gain(struct iio_gts *gts, int gain, int time)
 
 	return gain * itime->mul;
 }
+EXPORT_SYMBOL_NS_GPL(iio_gts_get_total_gain, "IIO_GTS_HELPER");
 
 static int iio_gts_get_scale_linear(struct iio_gts *gts, int gain, int time,
 				    u64 *scale)
diff --git a/include/linux/iio/iio-gts-helper.h b/include/linux/iio/iio-gts-helper.h
index e5de7a124bad6eb65414df364f84e81301b0690b..66f830ab9b49b566d549c7b5b8291d42a0825b96 100644
--- a/include/linux/iio/iio-gts-helper.h
+++ b/include/linux/iio/iio-gts-helper.h
@@ -208,5 +208,6 @@ int iio_gts_all_avail_scales(struct iio_gts *gts, const int **vals, int *type,
 			     int *length);
 int iio_gts_avail_scales_for_time(struct iio_gts *gts, int time,
 				  const int **vals, int *type, int *length);
+int iio_gts_get_total_gain(struct iio_gts *gts, int gain, int time);
 
 #endif

-- 
2.43.0