On Thu, 27 Oct 2022, Won Chung <wonchung@xxxxxxxxxx> wrote:
> Create a symlink pointing to USB Type-C connector for DRM connectors
> when they are created. The link will be created only if the firmware is
> able to describe the connection beween the two connectors.
The commit messages should explain the *why*.
BR,
Jani.
>
> Signed-off-by: Won Chung <wonchung@xxxxxxxxxx>
> Acked-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
> Changes from v2:
> - Resending the patch to dri-devel list
>
> Changes from v1:
> - Fix multiple lines to single line
>
>
> drivers/gpu/drm/drm_sysfs.c | 40 +++++++++++++++++++++++++++++++++++++
> 1 file changed, 40 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
> index 430e00b16eec..6a9904fa9186 100644
> --- a/drivers/gpu/drm/drm_sysfs.c
> +++ b/drivers/gpu/drm/drm_sysfs.c
> @@ -11,12 +11,14 @@
> */
>
> #include <linux/acpi.h>
> +#include <linux/component.h>
> #include <linux/device.h>
> #include <linux/err.h>
> #include <linux/export.h>
> #include <linux/gfp.h>
> #include <linux/i2c.h>
> #include <linux/kdev_t.h>
> +#include <linux/property.h>
> #include <linux/slab.h>
>
> #include <drm/drm_connector.h>
> @@ -95,6 +97,34 @@ static char *drm_devnode(struct device *dev, umode_t *mode)
> return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
> }
>
> +static int typec_connector_bind(struct device *dev,
> + struct device *typec_connector, void *data)
> +{
> + int ret;
> +
> + ret = sysfs_create_link(&dev->kobj, &typec_connector->kobj, "typec_connector");
> + if (ret)
> + return ret;
> +
> + ret = sysfs_create_link(&typec_connector->kobj, &dev->kobj, "drm_connector");
> + if (ret)
> + sysfs_remove_link(&dev->kobj, "typec_connector");
> +
> + return ret;
> +}
> +
> +static void typec_connector_unbind(struct device *dev,
> + struct device *typec_connector, void *data)
> +{
> + sysfs_remove_link(&typec_connector->kobj, "drm_connector");
> + sysfs_remove_link(&dev->kobj, "typec_connector");
> +}
> +
> +static const struct component_ops typec_connector_ops = {
> + .bind = typec_connector_bind,
> + .unbind = typec_connector_unbind,
> +};
> +
> static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
>
> /**
> @@ -355,6 +385,13 @@ int drm_sysfs_connector_add(struct drm_connector *connector)
> if (connector->ddc)
> return sysfs_create_link(&connector->kdev->kobj,
> &connector->ddc->dev.kobj, "ddc");
> +
> + if (dev_fwnode(kdev)) {
> + r = component_add(kdev, &typec_connector_ops);
> + if (r)
> + drm_err(dev, "failed to add component\n");
> + }
> +
> return 0;
>
> err_free:
> @@ -367,6 +404,9 @@ void drm_sysfs_connector_remove(struct drm_connector *connector)
> if (!connector->kdev)
> return;
>
> + if (dev_fwnode(connector->kdev))
> + component_del(connector->kdev, &typec_connector_ops);
> +
> if (connector->ddc)
> sysfs_remove_link(&connector->kdev->kobj, "ddc");
--
Jani Nikula, Intel Open Source Graphics Center
