[PATCH i-g-t v9 22/49] lib/unigraf: Introduce device configuration

[Louis Chauvet <louis.chauvet@bootlin.com>]

As there could be multiple devices detected by libTSI, add a configuration
field to ensure that igt will use the proper unigraf device.

The unigraf integration will search for a [Unigraf] entry containing a
Device=

For example, it can look like:

[Unigraf]
Device=UCD-500 [2434C620]

Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
---
 lib/unigraf/unigraf.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/lib/unigraf/unigraf.c b/lib/unigraf/unigraf.c
index df18ab178e16..9d5f0a488bed 100644
--- a/lib/unigraf/unigraf.c
+++ b/lib/unigraf/unigraf.c
@@ -12,6 +12,7 @@
 #include "unigraf.h"
 #include "TSI.h"
 #include "TSI_types.h"
+#include "igt_rc.h"
 
 #define unigraf_debug(fmt, ...)	igt_debug("TSI:%p: " fmt, unigraf_device, ##__VA_ARGS__)
 
@@ -19,6 +20,21 @@ static TSI_HANDLE unigraf_device;
 static char *unigraf_default_edid;
 static char *unigraf_connector_name;
 
+/**
+ * UNIGRAF_NAME_MAX - Maximum name length to be used for TSI functions
+ */
+#define UNIGRAF_NAME_MAX 1024
+
+/**
+ * UNIGRAF_CONFIG_GROUP - Name of the unigraf group in the configuration file
+ */
+#define UNIGRAF_CONFIG_GROUP "Unigraf"
+
+/**
+ * UNIGRAF_CONFIG_DEVICE_NAME - Key of the device name in the configuration file
+ */
+#define UNIGRAF_CONFIG_DEVICE_NAME "Device"
+
 static void unigraf_close_device(void)
 {
 	if (!unigraf_device)
@@ -65,6 +81,21 @@ static unsigned int unigraf_device_count(void)
 	return unigraf_assert(TSIX_DEV_GetDeviceCount());
 }
 
+static int unigraf_find_device(char *request)
+{
+	int device_count = unigraf_device_count();
+
+	for (int i = 0; i < device_count; i++) {
+		char dev_name[UNIGRAF_NAME_MAX] = "";
+
+		unigraf_assert(TSIX_DEV_GetDeviceName(i, dev_name, UNIGRAF_NAME_MAX));
+		unigraf_debug("Detected unigraf device %d: %s\n", i, dev_name);
+		if (!strncmp(dev_name, request, UNIGRAF_NAME_MAX))
+			return i;
+	}
+	return -ENODEV;
+}
+
 /**
  * unigraf_open_device() - Search and open a device.
  * @drm_fd: File descriptor of the currently used drm device
@@ -76,6 +107,8 @@ static unsigned int unigraf_device_count(void)
 bool unigraf_open_device(int drm_fd)
 {
 	TSI_RESULT r;
+	GError *cfg_error = NULL;
+	char *cfg_device = NULL;
 	int device_count;
 	int chosen_device = 0;
 	int chosen_role = 0;
@@ -88,6 +121,15 @@ bool unigraf_open_device(int drm_fd)
 
 	unigraf_init();
 
+	if (igt_key_file) {
+		cfg_device = g_key_file_get_string(igt_key_file, UNIGRAF_CONFIG_GROUP,
+						   UNIGRAF_CONFIG_DEVICE_NAME, &cfg_error);
+		if (cfg_error) {
+			unigraf_debug("No device name configured, uses first device available.\n");
+			cfg_device = NULL;
+		}
+	}
+
 	unigraf_assert(TSIX_DEV_RescanDevices(0, TSI_DEVCAP_VIDEO_CAPTURE, 0));
 
 	device_count = unigraf_device_count();
@@ -96,6 +138,14 @@ bool unigraf_open_device(int drm_fd)
 		return false;
 	}
 
+	if (cfg_device) {
+		chosen_device = unigraf_find_device(cfg_device);
+		if (chosen_device < 0) {
+			igt_warn("The requested unigraf device %s is not found, err: %d.\n", cfg_device, chosen_device);
+			return false;
+		}
+	}
+
 	unigraf_device = TSIX_DEV_OpenDevice(chosen_device, &r);
 	unigraf_assert(r);
 	igt_assert(unigraf_device);

-- 
2.52.0