> -----Original Message-----
> From: Winkler, Tomas
> Sent: Friday, February 8, 2019 3:42 AM
> To: C, Ramalingam <[email protected]>; [email protected];
> [email protected]; [email protected]; Shankar, Uma
> <[email protected]>
> Subject: RE: [PATCH v11 39/42] misc/mei/hdcp: Component framework for I915
> Interface
>
> > Mei hdcp driver is designed as component slave for the I915 component
> > master.
> >
> > v2: Rebased.
> > v3:
> > Notifier chain is adopted for cldev state update [Tomas]
> > v4:
> > Made static dummy functions as inline in mei_hdcp.h
> > API for polling client device status
> > IS_ENABLED used in header, for config status for mei_hdcp.
> > v5:
> > Replacing the notifier with component framework. [Daniel]
> > v6:
> > Rebased on the I915 comp master redesign.
> > v7:
> > mei_hdcp_component_registered is made static [Uma]
> > Need for global static variable mei_cldev is removed.
> > v8:
> > master comp is added to be matched with i915 subcomponent [daniel]
> > v9:
> > only comp_master is set and retrieved as driver_data [Daniel]
> > Reviewed-by Daniel.
> >
> > Signed-off-by: Ramalingam C <[email protected]>
> > Reviewed-by: Daniel Vetter <[email protected]>
> > ---
> > drivers/misc/mei/hdcp/mei_hdcp.c | 83
> > +++++++++++++++++++++++++++++++++++++++-
> > 1 file changed, 81 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> > b/drivers/misc/mei/hdcp/mei_hdcp.c
> > index 615eed149837..beba6fb4d2e2 100644
> > --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> > +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> > @@ -23,6 +23,7 @@
> > #include <linux/slab.h>
> > #include <linux/uuid.h>
> > #include <linux/mei_cl_bus.h>
> > +#include <linux/component.h>
> > #include <drm/drm_connector.h>
> > #include <drm/i915_component.h>
> > #include <drm/i915_mei_hdcp_interface.h> @@ -706,8 +707,7 @@
> > mei_hdcp_close_session(struct device *dev, struct hdcp_port_data *data)
> > return 0;
> > }
> >
> > -static __attribute__((unused))
> > -struct i915_hdcp_component_ops mei_hdcp_ops = {
> > +static struct i915_hdcp_component_ops mei_hdcp_ops = {
> > .owner = THIS_MODULE,
> > .initiate_hdcp2_session = mei_hdcp_initiate_session,
> > .verify_receiver_cert_prepare_km =
> > @@ -724,20 +724,99 @@ struct i915_hdcp_component_ops mei_hdcp_ops =
> {
> > .close_hdcp_session = mei_hdcp_close_session, };
> >
> > +static int mei_component_master_bind(struct device *dev) {
> > + struct mei_cl_device *cldev = to_mei_cl_device(dev);
> > + struct i915_hdcp_comp_master *comp_master =
> > +
> > mei_cldev_get_drvdata(cldev);
> > + int ret;
> > +
> > + dev_info(dev, "%s\n", __func__);
> > + comp_master->ops = &mei_hdcp_ops;
> > + comp_master->mei_dev = dev;
> > + ret = component_bind_all(dev, comp_master);
> > + if (ret < 0)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > +static void mei_component_master_unbind(struct device *dev) {
> > + struct mei_cl_device *cldev = to_mei_cl_device(dev);
> > + struct i915_hdcp_comp_master *comp_master =
> > +
> > mei_cldev_get_drvdata(cldev);
> > +
> > + dev_info(dev, "%s\n", __func__);
> > + component_unbind_all(dev, comp_master); }
> > +
> > +static const struct component_master_ops mei_component_master_ops = {
> > + .bind = mei_component_master_bind,
> > + .unbind = mei_component_master_unbind, };
> > +
> > +static int mei_hdcp_component_match(struct device *dev, int
> subcomponent,
> > + void *data)
> > +{
> > + return !strcmp(dev->driver->name, "i915") &&
> > + subcomponent == I915_COMPONENT_HDCP; }
> > +
> > static int mei_hdcp_probe(struct mei_cl_device *cldev,
> > const struct mei_cl_device_id *id) {
> > + struct i915_hdcp_comp_master *comp_master;
> > + struct component_match *master_match;
> > int ret;
> >
> > ret = mei_cldev_enable(cldev);
> > if (ret < 0)
> > dev_err(&cldev->dev, "mei_cldev_enable Failed. %d\n", ret);
> >
> > + comp_master = kzalloc(sizeof(*comp_master), GFP_KERNEL);
> > + if (!comp_master) {
> > + ret = -ENOMEM;
> > + goto comp_master_exit;
> > + }
> > +
> > + master_match = NULL;
> > + component_match_add_typed(&cldev->dev, &master_match,
> > + mei_hdcp_component_match,
> > comp_master);
> > + if (IS_ERR_OR_NULL(master_match)) {
> > + ret = -ENOMEM;
> > + goto match_add_exit;
> > + }
> > +
> > + mei_cldev_set_drvdata(cldev, comp_master);
> > + ret = component_master_add_with_match(&cldev->dev,
> > + &mei_component_master_ops,
> > + master_match);
> > + if (ret < 0) {
> > + dev_err(&cldev->dev, "Master comp add failed %d\n", ret);
> > + mei_cldev_set_drvdata(cldev, NULL);
> Can be done in exit label.
I will move it.
> > + goto match_add_exit;
> > + }
> > +
> > + return 0;
> > +
> > +match_add_exit:
> > + kfree(comp_master);
> > +comp_master_exit:
>
> You can use a single label as kfree is NULL safe.
Sure.
-Ram
> > + mei_cldev_disable(cldev);
> > +
> > return ret;
> > }
> >
> > static int mei_hdcp_remove(struct mei_cl_device *cldev) {
> > + struct i915_hdcp_comp_master *comp_master =
> > +
> > mei_cldev_get_drvdata(cldev);
> > +
> > + component_master_del(&cldev->dev, &mei_component_master_ops);
> > + kfree(comp_master);
> > + mei_cldev_set_drvdata(cldev, NULL);
> > +
> > return mei_cldev_disable(cldev);
> > }
> >
> > --
> > 2.7.4
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