usb: host: class: implement more of the class/data struct fields

Add a "struct usbh_class_api" for the host implementation, and move all
the function poitners to it, as it is done for the device support.
Add more fields to the host struct usbh_class_data mirrorring the device
side struct, including the API pointer.

Signed-off-by: Josuah Demangeon <[email protected]>

Author: Josuah Demangeon

include/zephyr/usb/usbh.h

@@ -61,6 +61,8 @@ struct usbh_context {
 	struct usb_device *root;
 	/** Allocated device addresses bit array */
 	struct sys_bitarray *addr_ba;
+	/** List of registered classes (functions) */
+	sys_slist_t class_list;
 };
 
 #define USBH_CONTROLLER_DEFINE(device_name, uhc_dev)			\
@@ -84,28 +86,45 @@ struct usbh_code_triple {
 	uint8_t proto;
 };
 
+struct usbh_class_data;
+
 /**
- * @brief USB host class data and class instance API
+ * @brief USB host class instance API
  */
-struct usbh_class_data {
-	/** Class code supported by this instance */
-	struct usbh_code_triple code;
-
+struct usbh_class_api {
 	/** Initialization of the class implementation */
-	/* int (*init)(struct usbh_context *const uhs_ctx); */
+	int (*init)(struct usbh_class_data *cdata);
 	/** Request completion event handler */
-	int (*request)(struct usbh_context *const uhs_ctx,
-			struct uhc_transfer *const xfer, int err);
+	int (*request)(struct usbh_class_data *cdata,
+		       struct uhc_transfer *const xfer, int err);
 	/** Device connected handler  */
-	int (*connected)(struct usbh_context *const uhs_ctx);
+	int (*connected)(struct usbh_class_data *cdata,
+			 void *desc_start_addr,
+			 void *desc_end_addr);
 	/** Device removed handler  */
-	int (*removed)(struct usbh_context *const uhs_ctx);
+	int (*removed)(struct usbh_class_data *cdata);
 	/** Bus remote wakeup handler  */
-	int (*rwup)(struct usbh_context *const uhs_ctx);
+	int (*rwup)(struct usbh_class_data *cdata);
 	/** Bus suspended handler  */
-	int (*suspended)(struct usbh_context *const uhs_ctx);
+	int (*suspended)(struct usbh_class_data *cdata);
 	/** Bus resumed handler  */
-	int (*resumed)(struct usbh_context *const uhs_ctx);
+	int (*resumed)(struct usbh_class_data *cdata);
+};
+
+/**
+ * @brief USB host class instance data
+ */
+struct usbh_class_data {
+	/** Name of the USB host class instance */
+	const char *name;
+	/** Pointer to USB host stack context structure */
+	struct usbh_context *uhs_ctx;
+	/** Class code supported by this instance */
+	struct usbh_code_triple code;
+	/** Pointer to host support class API */
+	struct usbh_class_api *api;
+	/** Pointer to private data */
+	void *priv;
 };
 
 /**