[Intel-gfx] [PATCH v10 36/40] misc/mei/hdcp: Component framework for I915 Interface

[Ramalingam C]

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]

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
Reviewed-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 90 +++++++++++++++++++++++++++++++++++++++-
 drivers/misc/mei/hdcp/mei_hdcp.h |  5 +++
 2 files changed, 93 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index edfc70fb0617..be2ce12ca460 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>
@@ -692,8 +693,7 @@ mei_close_hdcp_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_initiate_hdcp2_session,
 	.verify_receiver_cert_prepare_km = mei_verify_receiver_cert_prepare_km,
@@ -708,20 +708,106 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
 	.close_hdcp_session = mei_close_hdcp_session,
 };
 
+static int mei_component_master_bind(struct device *dev)
+{
+	struct mei_cl_device *cldev = to_mei_cl_device(dev);
+	struct mei_hdcp_drv_data *drv_data = mei_cldev_get_drvdata(cldev);
+	int ret;
+
+	dev_info(dev, "%s\n", __func__);
+	drv_data->comp_master->ops = &mei_hdcp_ops;
+	drv_data->comp_master->mei_dev = dev;
+	ret = component_bind_all(dev, drv_data->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 mei_hdcp_drv_data *drv_data = mei_cldev_get_drvdata(cldev);
+
+	dev_info(dev, "%s\n", __func__);
+	component_unbind_all(dev, drv_data->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 mei_hdcp_drv_data *drv_data;
 	int ret;
 
 	ret = mei_cldev_enable(cldev);
 	if (ret < 0)
 		dev_err(&cldev->dev, "mei_cldev_enable Failed. %d\n", ret);
 
+	drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
+	if (!drv_data) {
+		ret = -ENOMEM;
+		goto drv_data_exit;
+	}
+
+	drv_data->comp_master = kzalloc(sizeof(*drv_data->comp_master),
+					GFP_KERNEL);
+	if (!drv_data->comp_master) {
+		ret = -ENOMEM;
+		goto comp_master_exit;
+	}
+
+	drv_data->master_match = NULL;
+	component_match_add_typed(&cldev->dev, &drv_data->master_match,
+				  mei_hdcp_component_match,
+				  drv_data->comp_master);
+	if (IS_ERR_OR_NULL(drv_data->master_match)) {
+		ret = -ENOMEM;
+		goto match_add_exit;
+	}
+
+	mei_cldev_set_drvdata(cldev, drv_data);
+	ret = component_master_add_with_match(&cldev->dev,
+					      &mei_component_master_ops,
+					      drv_data->master_match);
+	if (ret < 0) {
+		dev_err(&cldev->dev, "Master comp add failed %d\n", ret);
+		mei_cldev_set_drvdata(cldev, NULL);
+		goto match_add_exit;
+	}
+
+	return 0;
+
+match_add_exit:
+	kfree(drv_data->comp_master);
+comp_master_exit:
+	kfree(drv_data);
+drv_data_exit:
+	mei_cldev_disable(cldev);
+
 	return ret;
 }
 
 static int mei_hdcp_remove(struct mei_cl_device *cldev)
 {
+	struct mei_hdcp_drv_data *drv_data = mei_cldev_get_drvdata(cldev);
+
+	component_master_del(&cldev->dev, &mei_component_master_ops);
+	kfree(drv_data->comp_master);
+	kfree(drv_data);
+	mei_cldev_set_drvdata(cldev, NULL);
+
 	return mei_cldev_disable(cldev);
 }
 
diff --git a/drivers/misc/mei/hdcp/mei_hdcp.h b/drivers/misc/mei/hdcp/mei_hdcp.h
index f831db3cbd54..5c872a57ba11 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.h
+++ b/drivers/misc/mei/hdcp/mei_hdcp.h
@@ -363,6 +363,11 @@ struct wired_cmd_repeater_auth_stream_req_out {
 	struct hdcp_port_id	port;
 } __packed;
 
+struct mei_hdcp_drv_data {
+	struct i915_hdcp_comp_master *comp_master;
+	struct component_match *master_match;
+};
+
 enum mei_hdcp_ddi {
 	MEI_DDI_INVALID_PORT = 0x0,
 
-- 
2.7.4