[PATCH i-g-t v3 1/2] tools/intel_hdcp: Introduce intel_hdcp tool

[Santhosh Reddy Guddati]

Add a new HDCP tool for self-testing and easy deployment
to client machines. This tool helps diagnose issues,
determining whether the problem lies in the driver or user space.

The current changes include tool skeleton and get hdcp info
on the connected outputs.

Wiki: https://en.wikipedia.org/wiki/High-bandwidth_Digital_Content_Protection

V2:
 - Update copyright to use SPDX (Jani Nikula).
 - Replace use of igt_* with fprintf and minimise usage of igt wrappers
   wherever possible (Kamil).
 - Consolidate HDCP version info and connector dump , remove redundant
   code and comments (Santhosh).

V3:
 - Remove unimplemented enable, disable options and add Wiki (Kamil).

Signed-off-by: Santhosh Reddy Guddati <santhosh.reddy.guddati at intel.com>
---
 tools/intel_hdcp.c | 126 +++++++++++++++++++++++++++++++++++++++++++++
 tools/meson.build  |   1 +
 2 files changed, 127 insertions(+)
 create mode 100644 tools/intel_hdcp.c

diff --git a/tools/intel_hdcp.c b/tools/intel_hdcp.c
new file mode 100644
index 000000000..fa7855d6e
--- /dev/null
+++ b/tools/intel_hdcp.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2025 Intel Corporation
+ */
+
+#include <fcntl.h>
+#include <stdio.h>
+
+#include "igt.h"
+
+#define MAX_HDCP_BUF_LEN	5000
+
+typedef struct data {
+	int fd;
+	igt_display_t display;
+	struct igt_fb red, green;
+	int height, width;
+} data_t;
+
+static const char *get_hdcp_version(int fd, char *connector_name)
+{
+	char buf[MAX_HDCP_BUF_LEN];
+	int ret;
+
+	ret = igt_debugfs_connector_dir(fd, connector_name, O_RDONLY);
+	if (ret < 0) {
+		fprintf(stderr, "Failed to open connector directory\n");
+		return NULL;
+	}
+
+	if (is_intel_device(fd))
+		igt_debugfs_simple_read(ret, "i915_hdcp_sink_capability", buf, sizeof(buf));
+	else
+		igt_debugfs_simple_read(ret, "hdcp_sink_capability", buf, sizeof(buf));
+
+	close(ret);
+	if (strstr(buf, "HDCP1.4") && strstr(buf, "HDCP2.2"))
+		return "HDCP1.4 and HDCP2.2";
+	else if (strstr(buf, "HDCP1.4"))
+		return "HDCP1.4";
+	else if (strstr(buf, "HDCP2.2"))
+		return "HDCP2.2";
+	else
+		return "No HDCP support";
+}
+
+static void get_hdcp_info(data_t *data)
+{
+	char *output_name;
+	drmModeRes *res = drmModeGetResources(data->fd);
+
+	if (!res) {
+		fprintf(stderr, "Failed to get DRM resources\n");
+		return;
+	}
+
+	fprintf(stderr, "Connectors:\n");
+	fprintf(stderr, "id\tencoder\tstatus\t\ttype\tHDCP\n");
+	for (int i = 0; i < res->count_connectors; i++) {
+		drmModeConnector *c;
+
+		c = drmModeGetConnectorCurrent(data->fd, res->connectors[i]);
+
+		if (!c)
+			continue;
+
+		asprintf(&output_name, "%s-%d",
+					kmstest_connector_type_str(c->connector_type),
+					c->connector_type_id);
+
+		fprintf(stderr, "%d\t%d\t%s\t%s\t%s\n",
+				 c->connector_id, c->encoder_id,
+				 kmstest_connector_status_str(c->connection),
+				 kmstest_connector_type_str(c->connector_type),
+				 get_hdcp_version(data->fd, output_name));
+
+		drmModeFreeConnector(c);
+	}
+
+	drmModeFreeResources(res);
+}
+
+static void print_usage(void)
+{
+	fprintf(stderr, "Usage: intel_hdcp [OPTIONS]\n");
+	fprintf(stderr, "Options:\n");
+	fprintf(stderr, "-i,	--info		Get HDCP Information\n");
+	fprintf(stderr, "-h,	--help		Display this help message\n");
+}
+
+static void test_init(data_t *data)
+{
+	data->fd = __drm_open_driver(DRIVER_ANY);
+	if (data->fd < 0) {
+		fprintf(stderr, "Failed to open DRM driver\n");
+		exit(EXIT_FAILURE);
+	}
+	igt_display_require(&data->display, data->fd);
+	igt_display_require_output(&data->display);
+}
+
+int main(int argc, char **argv)
+{
+	data_t data;
+	int option;
+	static const char optstr[] = "hi";
+	struct option long_opts[] = {
+		{"help",	no_argument,	NULL, 'h'},
+		{"info",	no_argument,	NULL, 'i'},
+		{NULL,		0,		NULL,  0 }
+	};
+
+	test_init(&data);
+
+	while ((option = getopt_long(argc, argv, optstr, long_opts, NULL)) != -1) {
+		switch (option) {
+		case 'i':
+			get_hdcp_info(&data);
+			break;
+		case 'h':
+		default:
+			print_usage();
+			break;
+		}
+	}
+}
diff --git a/tools/meson.build b/tools/meson.build
index de866c392..8185ba160 100644
--- a/tools/meson.build
+++ b/tools/meson.build
@@ -30,6 +30,7 @@ tools_progs = [
 	'intel_gpu_time',
 	'intel_gtt',
 	'intel_guc_logger',
+	'intel_hdcp',
 	'intel_infoframes',
 	'intel_lid',
 	'intel_opregion_decode',
-- 
2.34.1