[igt-dev] [PATCH i-g-t 1/5] lib/igt_eld: introduce an ELD library

[Simon Ser <simon.ser@intel.com>]

There are two reasons why I want to introduce this library:

- I want to use it from the Chamelium tests for DisplayPort
- I want to expand it to also check that audio parameters parsed by ALSA are
  correct (formats, sampling rates, sample sizes and so on)

Signed-off-by: Simon Ser <simon.ser@intel.com>
---
 lib/igt_eld.c           | 111 ++++++++++++++++++++++++++++++++++++++++
 lib/igt_eld.h           |  35 +++++++++++++
 lib/meson.build         |   1 +
 tests/kms_hdmi_inject.c |  80 ++---------------------------
 4 files changed, 152 insertions(+), 75 deletions(-)
 create mode 100644 lib/igt_eld.c
 create mode 100644 lib/igt_eld.h

diff --git a/lib/igt_eld.c b/lib/igt_eld.c
new file mode 100644
index 000000000000..8e0dcc306e85
--- /dev/null
+++ b/lib/igt_eld.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright © 2019 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors: Simon Ser <simon.ser@intel.com>
+ */
+
+#include "config.h"
+
+#include <dirent.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "igt_eld.h"
+
+/**
+ * EDID-Like Data (ELD) is metadata parsed and exposed by ALSA for HDMI and
+ * DisplayPort connectors supporting audio. This includes the monitor name and
+ * the supported audio parameters (formats, sampling rates, sample sizes and so
+ * on).
+ */
+
+/** eld_entry_is_igt: checks whether an ELD entry is mapped to the IGT EDID */
+static bool eld_entry_is_igt(const char *path)
+{
+	FILE *in;
+	char buf[1024];
+	uint8_t eld_valid = 0;
+	uint8_t mon_valid = 0;
+
+	in = fopen(path, "r");
+	if (!in)
+		return false;
+
+	memset(buf, 0, 1024);
+
+	while ((fgets(buf, 1024, in)) != NULL) {
+		char *line = buf;
+
+		if (!strncasecmp(line, "eld_valid", 9) &&
+				strstr(line, "1")) {
+			eld_valid++;
+		}
+
+		if (!strncasecmp(line, "monitor_name", 12) &&
+				strstr(line, "IGT")) {
+			mon_valid++;
+		}
+	}
+
+	fclose(in);
+	if (mon_valid && eld_valid)
+		return true;
+
+	return false;
+}
+
+/** eld_has_igt: check whether ALSA has detected the audio-capable IGT EDID by
+ * parsing ELD entries */
+bool eld_has_igt(void)
+{
+	DIR *dir;
+	struct dirent *snd_hda;
+	int i;
+
+	for (i = 0; i < 8; i++) {
+		char cards[128];
+
+		snprintf(cards, sizeof(cards), "/proc/asound/card%d", i);
+		dir = opendir(cards);
+		if (!dir)
+			continue;
+
+		while ((snd_hda = readdir(dir))) {
+			char fpath[PATH_MAX];
+
+			if (*snd_hda->d_name == '.' ||
+			    strstr(snd_hda->d_name, "eld") == 0)
+				continue;
+
+			snprintf(fpath, sizeof(fpath), "%s/%s", cards,
+				 snd_hda->d_name);
+			if (eld_entry_is_igt(fpath)) {
+				closedir(dir);
+				return true;
+			}
+		}
+		closedir(dir);
+	}
+
+	return false;
+}
diff --git a/lib/igt_eld.h b/lib/igt_eld.h
new file mode 100644
index 000000000000..27f876d9f631
--- /dev/null
+++ b/lib/igt_eld.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright © 2019 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors: Simon Ser <simon.ser@intel.com>
+ */
+
+#ifndef IGT_ELD_H
+#define IGT_ELD_H
+
+#include "config.h"
+
+#include <stdbool.h>
+
+bool eld_has_igt(void);
+
+#endif
diff --git a/lib/meson.build b/lib/meson.build
index cdb450e1e762..844e0abcd919 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -59,6 +59,7 @@ lib_sources = [
 	'igt_psr.c',
 	'igt_amd.c',
 	'igt_edid.c',
+	'igt_eld.c',
 ]
 
 lib_deps = [
diff --git a/tests/kms_hdmi_inject.c b/tests/kms_hdmi_inject.c
index a24061042c20..eba25046cead 100644
--- a/tests/kms_hdmi_inject.c
+++ b/tests/kms_hdmi_inject.c
@@ -22,8 +22,12 @@
  *
  */
 
+#include "config.h"
+
 #include <dirent.h>
+
 #include "igt.h"
+#include "igt_eld.h"
 
 #define HDISPLAY_4K	3840
 #define VDISPLAY_4K	2160
@@ -134,80 +138,6 @@ hdmi_inject_4k(int drm_fd, drmModeConnector *connector)
 	free(edid);
 }
 
-/** eld_entry_is_igt: checks whether an ELD entry is mapped to the IGT EDID */
-static bool
-eld_entry_is_igt(const char* path)
-{
-	FILE *in;
-	char buf[1024];
-	uint8_t eld_valid = 0;
-	uint8_t mon_valid = 0;
-
-	in = fopen(path, "r");
-	if (!in)
-		return false;
-
-	memset(buf, 0, 1024);
-
-	while ((fgets(buf, 1024, in)) != NULL) {
-
-		char *line = buf;
-
-		if (!strncasecmp(line, "eld_valid", 9) &&
-				strstr(line, "1")) {
-			eld_valid++;
-		}
-
-		if (!strncasecmp(line, "monitor_name", 12) &&
-				strstr(line, "IGT")) {
-			mon_valid++;
-		}
-	}
-
-	fclose(in);
-	if (mon_valid && eld_valid)
-		return true;
-
-	return false;
-}
-
-/** eld_is_valid: check whether ALSA has detected the audio-capable IGT EDID by
- * parsing ELD entries */
-static bool
-eld_is_valid(void)
-{
-	DIR *dir;
-	struct dirent *snd_hda;
-	int i;
-
-	for (i = 0; i < 8; i++) {
-		char cards[128];
-
-		snprintf(cards, sizeof(cards), "/proc/asound/card%d", i);
-		dir = opendir(cards);
-		if (!dir)
-			continue;
-
-		while ((snd_hda = readdir(dir))) {
-			char fpath[PATH_MAX];
-
-			if (*snd_hda->d_name == '.' ||
-			    strstr(snd_hda->d_name, "eld") == 0)
-				continue;
-
-			snprintf(fpath, sizeof(fpath), "%s/%s", cards,
-				 snd_hda->d_name);
-			if (eld_entry_is_igt(fpath)) {
-				closedir(dir);
-				return true;
-			}
-		}
-		closedir(dir);
-	}
-
-	return false;
-}
-
 static void
 hdmi_inject_audio(int drm_fd, drmModeConnector *connector)
 {
@@ -252,7 +182,7 @@ hdmi_inject_audio(int drm_fd, drmModeConnector *connector)
 	 * Test if we have /proc/asound/HDMI/eld#0.0 and is its contents are
 	 * valid.
 	 */
-	igt_assert(eld_is_valid());
+	igt_assert(eld_has_igt());
 
 	igt_remove_fb(drm_fd, &fb);
 
-- 
2.21.0

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