[PATCH i-g-t v9 24/49] lib/unigraf: Introduce input configuration

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

As multiple input can be present on unigraf devices, add a configuration
field to select the proper input. By default it will take the first
available.

The configuration can look like:

[Unigraf]
Device=UCD-500 [2434C620]
Role=DisplayPort Source and Sink
Input=DP RX

Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
---
 lib/unigraf/unigraf.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 55 insertions(+), 1 deletion(-)

diff --git a/lib/unigraf/unigraf.c b/lib/unigraf/unigraf.c
index cf760357c6be..43179d5fb600 100644
--- a/lib/unigraf/unigraf.c
+++ b/lib/unigraf/unigraf.c
@@ -41,11 +41,21 @@ static char *unigraf_connector_name;
  */
 #define UNIGRAF_CONFIG_DEVICE_ROLE "Role"
 
+/**
+ * UNIGRAF_CONFIG_INPUT_NAME - Key of the input name in the configuration file
+ */
+#define UNIGRAF_CONFIG_INPUT_NAME "Input"
+
 /**
  * UNIGRAF_DEFAULT_ROLE_NAME - Default role name to search on the unigraf device
  */
 #define UNIGRAF_DEFAULT_ROLE_NAME "USB-C, DP Alt Mode Source and Sink"
 
+/**
+ * UNIGRAF_DEFAULT_INPUT_NAME - Default input name to search on the unigraf device
+ */
+#define UNIGRAF_DEFAULT_INPUT_NAME "DP RX"
+
 static void unigraf_close_device(void)
 {
 	if (!unigraf_device)
@@ -124,6 +134,22 @@ static int unigraf_find_role(const char *request)
 	return -ENODEV;
 }
 
+static int unigraf_find_input(const char *request)
+{
+	int role_count = unigraf_assert(TSIX_VIN_GetInputCount(unigraf_device));
+
+	for (int i = 0; i < role_count; i++) {
+		char input_name[UNIGRAF_NAME_MAX] = "";
+
+		unigraf_assert(TSIX_VIN_GetInputName(unigraf_device, i,
+						     input_name, UNIGRAF_NAME_MAX));
+		unigraf_debug("Input %d: %s\n", i, input_name);
+		if (!strncmp(input_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
@@ -138,10 +164,11 @@ bool unigraf_open_device(int drm_fd)
 	GError *cfg_error = NULL;
 	char *cfg_device = NULL;
 	char *cfg_role = NULL;
+	char *cfg_input = NULL;
 	int device_count;
 	int chosen_device = 0;
 	int chosen_role;
-	int chosen_input = 0;
+	int chosen_input;
 
 	assert(igt_can_fail());
 
@@ -165,6 +192,14 @@ bool unigraf_open_device(int drm_fd)
 			unigraf_debug("No device role configured.\n");
 			cfg_role = NULL;
 		}
+
+		cfg_error = NULL;
+		cfg_input = g_key_file_get_string(igt_key_file, UNIGRAF_CONFIG_GROUP,
+						  UNIGRAF_CONFIG_INPUT_NAME, &cfg_error);
+		if (cfg_error) {
+			unigraf_debug("No input name configured.\n");
+			cfg_input = NULL;
+		}
 	}
 
 	unigraf_assert(TSIX_DEV_RescanDevices(0, TSI_DEVCAP_VIDEO_CAPTURE, 0));
@@ -207,6 +242,25 @@ bool unigraf_open_device(int drm_fd)
 	}
 
 	unigraf_assert(TSIX_DEV_SelectRole(unigraf_device, chosen_role));
+
+	if (!cfg_input) {
+		unigraf_debug("No input configured, trying " UNIGRAF_DEFAULT_INPUT_NAME "\n");
+		chosen_input = unigraf_find_input(UNIGRAF_DEFAULT_INPUT_NAME);
+		if (chosen_input < 0) {
+			char input_name[UNIGRAF_NAME_MAX];
+
+			chosen_input = 0;
+			unigraf_assert(TSIX_VIN_GetInputName(unigraf_device, chosen_input,
+							     input_name, UNIGRAF_NAME_MAX));
+			unigraf_debug("Input " UNIGRAF_DEFAULT_INPUT_NAME " not found, using input 0 (%s).\n",
+				      input_name);
+		}
+	} else  {
+		chosen_input = unigraf_find_input(cfg_input);
+		igt_assert_f(chosen_input >= 0, "TSI:%p: Input %s not found.",
+			     unigraf_device, cfg_input);
+	}
+
 	unigraf_assert(TSIX_VIN_Select(unigraf_device, chosen_input));
 	unigraf_assert(TSIX_VIN_Enable(unigraf_device, chosen_input));
 

-- 
2.52.0