drm: Add ddc link in sysfs created by drm_connector

Add generic code which creates symbolic links in sysfs, pointing to ddc
interface used by a particular video output. For example:

ls -l /sys/class/drm/card0-HDMI-A-1/ddc
lrwxrwxrwx 1 root root 0 Jun 24 10:42 /sys/class/drm/card0-HDMI-A-1/ddc \
	-> ../../../../soc/13880000.i2c/i2c-2

This makes it easy for user to associate a display with its ddc adapter
and use e.g. ddcutil to control the chosen monitor.

This patch adds an i2c_adapter pointer to struct drm_connector. Particular
drivers can then use it instead of using their own private instance. If a
connector contains a ddc, then create a symbolic link in sysfs.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/d470def6cd661b777faeee67b5838a4623c4010e.1564161140.git.andrzej.p@collabora.com

drivers/gpu/drm/drm_sysfs.c

@@ -14,6 +14,7 @@
 #include <linux/err.h>
 #include <linux/export.h>
 #include <linux/gfp.h>
+#include <linux/i2c.h>
 #include <linux/kdev_t.h>
 #include <linux/slab.h>
 
@@ -294,6 +295,9 @@ int drm_sysfs_connector_add(struct drm_connector *connector)
 	/* Let userspace know we have a new connector */
 	drm_sysfs_hotplug_event(dev);
 
+	if (connector->ddc)
+		return sysfs_create_link(&connector->kdev->kobj,
+				 &connector->ddc->dev.kobj, "ddc");
 	return 0;
 }
 
@@ -301,6 +305,10 @@ void drm_sysfs_connector_remove(struct drm_connector *connector)
 {
 	if (!connector->kdev)
 		return;
+
+	if (connector->ddc)
+		sysfs_remove_link(&connector->kdev->kobj, "ddc");
+
 	DRM_DEBUG("removing \"%s\" from sysfs\n",
 		  connector->name);
 

include/drm/drm_connector.h

@@ -41,6 +41,7 @@ struct drm_property;
 struct drm_property_blob;
 struct drm_printer;
 struct edid;
+struct i2c_adapter;
 
 enum drm_connector_force {
 	DRM_FORCE_UNSPECIFIED,
@@ -1311,6 +1312,16 @@ struct drm_connector {
 	 * [0]: progressive, [1]: interlaced
 	 */
 	int audio_latency[2];
+
+	/**
+	 * @ddc: associated ddc adapter.
+	 * A connector usually has its associated ddc adapter. If a driver uses
+	 * this field, then an appropriate symbolic link is created in connector
+	 * sysfs directory to make it easy for the user to tell which i2c
+	 * adapter is for a particular display.
+	 */
+	struct i2c_adapter *ddc;
+
 	/**
 	 * @null_edid_counter: track sinks that give us all zeros for the EDID.
 	 * Needed to workaround some HW bugs where we get all 0s