From 292a9868301e364f27412d0348bbeb3714e89b05 Mon Sep 17 00:00:00 2001
From: Dimitri Stolnikov <horiz0n@gmx.net>
Date: Sat, 2 Jun 2012 01:14:31 +0200
Subject: introduce getters for tuner parameters (gain, type)

---
 software/libosmosdr/include/osmosdr.h | 14 ++++++++++++++
 software/libosmosdr/src/libosmosdr.c  | 19 +++++++++++++++++++
 software/libosmosdr/src/osmo_sdr.c    | 10 ++++++++++
 3 files changed, 43 insertions(+)

diff --git a/software/libosmosdr/include/osmosdr.h b/software/libosmosdr/include/osmosdr.h
index 396fe36..e80a2f8 100644
--- a/software/libosmosdr/include/osmosdr.h
+++ b/software/libosmosdr/include/osmosdr.h
@@ -109,6 +109,18 @@ OSMOSDR_API int osmosdr_set_center_freq(osmosdr_dev_t *dev, uint32_t freq);
  */
 OSMOSDR_API uint32_t osmosdr_get_center_freq(osmosdr_dev_t *dev);
 
+/*!
+ * Get a list of gains supported by the tuner.
+ *
+ * NOTE: The gains argument must be preallocated by the caller. If NULL is
+ * being given instead, the number of available gain values will be returned.
+ *
+ * \param dev the device handle given by osmosdr_open()
+ * \param gains array of gain values. In tenths of a dB, 115 means 11.5 dB.
+ * \return <= 0 on error, number of available (returned) gain values otherwise
+ */
+OSMOSDR_API int osmosdr_get_tuner_gains(osmosdr_dev_t *dev, int *gains);
+
 /*!
  * Set the gain for the device.
  * Manual gain mode must be enabled for this to work.
@@ -117,6 +129,8 @@ OSMOSDR_API uint32_t osmosdr_get_center_freq(osmosdr_dev_t *dev);
  * -10, 15, 40, 65, 90, 115, 140, 165, 190,
  * 215, 240, 290, 340, 420, 430, 450, 470, 490
  *
+ * Valid gain values may be queried with \ref osmosdr_get_tuner_gains function.
+ *
  * \param dev the device handle given by osmosdr_open()
  * \param gain in tenths of a dB, 115 means 11.5 dB.
  * \return 0 on success
diff --git a/software/libosmosdr/src/libosmosdr.c b/software/libosmosdr/src/libosmosdr.c
index f4329b5..4bc57b3 100644
--- a/software/libosmosdr/src/libosmosdr.c
+++ b/software/libosmosdr/src/libosmosdr.c
@@ -332,6 +332,25 @@ uint32_t osmosdr_get_center_freq(osmosdr_dev_t *dev)
 	return dev->freq;
 }
 
+int osmosdr_get_tuner_gains(osmosdr_dev_t *dev, int *gains)
+{
+	const int e4k_gains[] = { -10, 15, 40, 65, 90, 115, 140, 165, 190, 215,
+				  240, 290, 340, 420, 430, 450, 470, 490 };
+	int len = sizeof(e4k_gains);
+
+	if (!dev)
+		return -1;
+
+	if (!gains) { /* no buffer provided, just return the count */
+		return len / sizeof(int);
+	} else {
+		if (len)
+			memcpy(gains, e4k_gains, len);
+
+		return len / sizeof(int);
+	}
+}
+
 int osmosdr_set_tuner_gain(osmosdr_dev_t *dev, int gain)
 {
 	int r = 0;
diff --git a/software/libosmosdr/src/osmo_sdr.c b/software/libosmosdr/src/osmo_sdr.c
index b5e510b..f3eb8f6 100644
--- a/software/libosmosdr/src/osmo_sdr.c
+++ b/software/libosmosdr/src/osmo_sdr.c
@@ -108,6 +108,9 @@ int main(int argc, char **argv)
 	uint32_t out_block_size = DEFAULT_BUF_LENGTH;
 	int device_count;
 	char vendor[256] = { 0 }, product[256] = { 0 }, serial[256] = { 0 };
+	int count;
+	int gains[100];
+
 #ifndef _WIN32
 	while ((opt = getopt(argc, argv, "d:f:g:s:b:S::")) != -1) {
 		switch (opt) {
@@ -194,6 +197,13 @@ int main(int argc, char **argv)
 #else
 	SetConsoleCtrlHandler( (PHANDLER_ROUTINE) sighandler, TRUE );
 #endif
+	count = osmosdr_get_tuner_gains(dev, NULL);
+	fprintf(stderr, "Supported gain values (%d): ", count);
+
+	count = osmosdr_get_tuner_gains(dev, gains);
+	for (i = 0; i < count; i++)
+		fprintf(stderr, "%.1f ", gains[i] / 10.0);
+	fprintf(stderr, "\n");
 
 	r = osmosdr_get_usb_strings(dev, vendor, product, serial);
 	if (r < 0)
-- 
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