linux-kernel - Re: [PATCH v2] drm/sysfs: Link DRM connectors to corresponding Type-C connectors

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Date:   Mon, 3 Oct 2022 10:02:38 -0700
From:   Won Chung <wonchung@...gle.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     bleung@...gle.com, pmalani@...omium.org, imre.deak@...el.com,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...ux.ie, daniel@...ll.ch,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/sysfs: Link DRM connectors to corresponding Type-C connectors

On Tue, Sep 27, 2022 at 2:07 AM Heikki Krogerus
<heikki.krogerus@...ux.intel.com> wrote:
>
> On Mon, Sep 26, 2022 at 09:41:57PM +0000, Won Chung 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.
> >
> > Signed-off-by: Won Chung <wonchung@...gle.com>
>
> Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
>
> > ---
> > 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");
> >
>
> thanks,
>
> --
> heikki

Hi upstream DRM maintainers,

Can one of you take a look at this patch for a review when you have
time? Thank you!

Won