tools/intel_bios_reader: Decode the device type bits

Each bit in the device type is supposed to mean something. Decode their
meaning.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

2 files changed, 50 insertions, 0 deletions

diff --git a/tools/intel_bios.h b/tools/intel_bios.h
index cd6abf94..a97797f0 100644
--- a/tools/intel_bios.h
+++ b/tools/intel_bios.h
@@ -142,6 +142,24 @@ struct bdb_general_features {
 #define DEVICE_HANDLE_LPF1	0x08
 #define DEVICE_HANDLE_LFP2	0x80
 
+/* device type bits */
+#define DEVICE_TYPE_CLASS_EXTENSION	15
+#define DEVICE_TYPE_POWER_MANAGEMENT	14
+#define DEVICE_TYPE_HOTPLUG_SIGNALING	13
+#define DEVICE_TYPE_INTERNAL_CONNECTOR	12
+#define DEVICE_TYPE_NOT_HDMI_OUTPUT	11
+#define DEVICE_TYPE_MIPI_OUTPUT		10
+#define DEVICE_TYPE_COMPOSITE_OUTPUT	9
+#define DEVICE_TYPE_DIAL_CHANNEL	8
+#define DEVICE_TYPE_CONTENT_PROTECTION	7
+#define DEVICE_TYPE_HIGH_SPEED_LINK	6
+#define DEVICE_TYPE_LVDS_SIGNALING	5
+#define DEVICE_TYPE_TMDS_DVI_SIGNALING	4
+#define DEVICE_TYPE_VIDEO_SIGNALING	3
+#define DEVICE_TYPE_DISPLAYPORT_OUTPUT	2
+#define DEVICE_TYPE_DIGITAL_OUTPUT	1
+#define DEVICE_TYPE_ANALOG_OUTPUT	0
+
 /* Pre 915 */
 #define DEVICE_TYPE_NONE	0x00
 #define DEVICE_TYPE_CRT		0x01
diff --git a/tools/intel_bios_reader.c b/tools/intel_bios_reader.c
index 19c988ba..459b547b 100644
--- a/tools/intel_bios_reader.c
+++ b/tools/intel_bios_reader.c
@@ -254,6 +254,37 @@ static const char *child_device_type(unsigned short type)
 	return "unknown";
 }
 
+static const char * const child_device_type_bits[] = {
+	[DEVICE_TYPE_CLASS_EXTENSION] = "Class extension",
+	[DEVICE_TYPE_POWER_MANAGEMENT] = "Power management",
+	[DEVICE_TYPE_HOTPLUG_SIGNALING] = "Hotplug signaling",
+	[DEVICE_TYPE_INTERNAL_CONNECTOR] = "Internal connector",
+	[DEVICE_TYPE_NOT_HDMI_OUTPUT] = "HDMI output", /* decoded as inverse */
+	[DEVICE_TYPE_MIPI_OUTPUT] = "MIPI output",
+	[DEVICE_TYPE_COMPOSITE_OUTPUT] = "Composite output",
+	[DEVICE_TYPE_DIAL_CHANNEL] = "Dual channel",
+	[DEVICE_TYPE_CONTENT_PROTECTION] = "Content protection",
+	[DEVICE_TYPE_HIGH_SPEED_LINK] = "High speel link",
+	[DEVICE_TYPE_LVDS_SIGNALING] = "LVDS signaling",
+	[DEVICE_TYPE_TMDS_DVI_SIGNALING] = "TMDS/DVI signaling",
+	[DEVICE_TYPE_VIDEO_SIGNALING] = "Video signaling",
+	[DEVICE_TYPE_DISPLAYPORT_OUTPUT] = "DisplayPort output",
+	[DEVICE_TYPE_DIGITAL_OUTPUT] = "Digital output",
+	[DEVICE_TYPE_ANALOG_OUTPUT] = "Analog output",
+};
+
+static void dump_child_device_type_bits(uint16_t type)
+{
+	int bit;
+
+	type ^= 1 << DEVICE_TYPE_NOT_HDMI_OUTPUT;
+
+	for (bit = 15; bit >= 0; bit--) {
+		if (type & (1 << bit))
+			printf("\t\t\t%s\n", child_device_type_bits[bit]);
+	}
+}
+
 static const struct {
 	unsigned char handle;
 	const char *name;
@@ -354,6 +385,7 @@ static void dump_child_device(struct child_device_config *child)
 		       child_device_handle(efp->handle));
 		printf("\t\tDevice type: 0x%04x (%s)\n", efp->device_type,
 		       child_device_type(efp->device_type));
+		dump_child_device_type_bits(efp->device_type);
 		printf("\t\tPort: 0x%02x (%s)\n", efp->port,
 		       efp_port(efp->port));
 		printf("\t\tDDC pin: 0x%02x\n", efp->ddc_pin);