platform/surface: aggregator: Rename top-level request functions to avoid ambiguities

We currently have a struct ssam_request_sync and a function
ssam_request_sync(). While this is valid C, there are some downsides to
it.

One of these is that current Sphinx versions (>= 3.0) cannot
disambiguate between the two (see disucssion and pull request linked
below). It instead emits a "WARNING: Duplicate C declaration" and links
for the struct and function in the resulting documentation link to the
same entry (i.e. both to either function or struct documentation)
instead of their respective own entries.

While we could just ignore that and wait for a fix, there's also a point
to be made that the current naming can be somewhat confusing when
searching (e.g. via grep) or trying to understand the levels of
abstraction at play:

We currently have struct ssam_request_sync and associated functions
ssam_request_sync_[alloc|free|init|wait|...]() operating on this struct.
However, function ssam_request_sync() is one abstraction level above
this. Similarly, ssam_request_sync_with_buffer() is not a function
operating on struct ssam_request_sync, but rather a sibling to
ssam_request_sync(), both using the struct under the hood.

Therefore, rename the top level request functions:

ssam_request_sync() -> ssam_request_do_sync()
ssam_request_sync_with_buffer() -> ssam_request_do_sync_with_buffer()
ssam_request_sync_onstack() -> ssam_request_do_sync_onstack()

Link: https://lore.kernel.org/all/[e-mail]/
Link: https://github.com/sphinx-doc/sphinx/pull/8313
Signed-off-by: Maximilian Luz <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Hans de Goede <[e-mail]>
Signed-off-by: Hans de Goede <[e-mail]>

Documentation/driver-api/surface_aggregator/client.rst

···
 .. |ssam_notifier_unregister| replace:: :c:func:`ssam_notifier_unregister`
 .. |ssam_device_notifier_register| replace:: :c:func:`ssam_device_notifier_register`
 .. |ssam_device_notifier_unregister| replace:: :c:func:`ssam_device_notifier_unregister`
-.. |ssam_request_sync| replace:: :c:func:`ssam_request_sync`
+.. |ssam_request_do_sync| replace:: :c:func:`ssam_request_do_sync`
 .. |ssam_event_mask| replace:: :c:type:`enum ssam_event_mask <ssam_event_mask>`
 
 
···
             * with the SSAM_REQUEST_HAS_RESPONSE flag set in the specification
             * above.
             */
-           status = ssam_request_sync(ctrl, &rqst, &resp);
+           status = ssam_request_do_sync(ctrl, &rqst, &resp);
 
            /*
             * Alternatively use
             *
-            *   ssam_request_sync_onstack(ctrl, &rqst, &resp, sizeof(arg_le));
+            *   ssam_request_do_sync_onstack(ctrl, &rqst, &resp, sizeof(arg_le));
             *
             * to perform the request, allocating the message buffer directly
             * on the stack as opposed to allocation via kzalloc().
···
            return status;
    }
 
-Note that |ssam_request_sync| in its essence is a wrapper over lower-level
+Note that |ssam_request_do_sync| in its essence is a wrapper over lower-level
 request primitives, which may also be used to perform requests. Refer to its
 implementation and documentation for more details.
 

drivers/hid/surface-hid/surface_hid.c

···
 
 		rsp.length = 0;
 
-		status = ssam_retry(ssam_request_sync_onstack, shid->ctrl, &rqst, &rsp,
+		status = ssam_retry(ssam_request_do_sync_onstack, shid->ctrl, &rqst, &rsp,
 				    sizeof(*slice));
 		if (status)
 			return status;
···
 
 	buf[0] = rprt_id;
 
-	return ssam_retry(ssam_request_sync, shid->ctrl, &rqst, NULL);
+	return ssam_retry(ssam_request_do_sync, shid->ctrl, &rqst, NULL);
 }
 
 static int ssam_hid_get_raw_report(struct surface_hid_device *shid, u8 rprt_id, u8 *buf, size_t len)
···
 	rsp.length = 0;
 	rsp.pointer = buf;
 
-	return ssam_retry(ssam_request_sync_onstack, shid->ctrl, &rqst, &rsp, sizeof(rprt_id));
+	return ssam_retry(ssam_request_do_sync_onstack, shid->ctrl, &rqst, &rsp, sizeof(rprt_id));
 }
 
 static u32 ssam_hid_event_fn(struct ssam_event_notifier *nf, const struct ssam_event *event)

drivers/hid/surface-hid/surface_kbd.c

···
 	rsp.length = 0;
 	rsp.pointer = buf;
 
-	status = ssam_retry(ssam_request_sync_onstack, shid->ctrl, &rqst, &rsp, sizeof(entry));
+	status = ssam_retry(ssam_request_do_sync_onstack, shid->ctrl, &rqst, &rsp, sizeof(entry));
 	if (status)
 		return status;
 
···
 	rqst.length = sizeof(value_u8);
 	rqst.payload = &value_u8;
 
-	return ssam_retry(ssam_request_sync_onstack, shid->ctrl, &rqst, NULL, sizeof(value_u8));
+	return ssam_retry(ssam_request_do_sync_onstack, shid->ctrl, &rqst, NULL, sizeof(value_u8));
 }
 
 static int ssam_kbd_get_feature_report(struct surface_hid_device *shid, u8 *buf, size_t len)
···
 	rsp.length = 0;
 	rsp.pointer = buf;
 
-	status = ssam_retry(ssam_request_sync_onstack, shid->ctrl, &rqst, &rsp, sizeof(payload));
+	status = ssam_retry(ssam_request_do_sync_onstack, shid->ctrl, &rqst, &rsp, sizeof(payload));
 	if (status)
 		return status;
 

drivers/platform/surface/aggregator/bus.c

···
 	 * is always valid and can be used for requests as long as the client
 	 * device we add here is registered as child under it. This essentially
 	 * guarantees that the client driver can always expect the preconditions
-	 * for functions like ssam_request_sync (controller has to be started
-	 * and is not suspended) to hold and thus does not have to check for
-	 * them.
+	 * for functions like ssam_request_do_sync() (controller has to be
+	 * started and is not suspended) to hold and thus does not have to check
+	 * for them.
 	 *
 	 * Note that for this to work, the controller has to be a parent device.
 	 * If it is not a direct parent, care has to be taken that the device is

drivers/platform/surface/aggregator/controller.c

···
 EXPORT_SYMBOL_GPL(ssam_request_sync_submit);
 
 /**
- * ssam_request_sync() - Execute a synchronous request.
+ * ssam_request_do_sync() - Execute a synchronous request.
  * @ctrl: The controller via which the request will be submitted.
  * @spec: The request specification and payload.
  * @rsp:  The response buffer.
···
  *
  * Return: Returns the status of the request or any failure during setup.
  */
-int ssam_request_sync(struct ssam_controller *ctrl,
-		      const struct ssam_request *spec,
-		      struct ssam_response *rsp)
+int ssam_request_do_sync(struct ssam_controller *ctrl,
+			 const struct ssam_request *spec,
+			 struct ssam_response *rsp)
 {
 	struct ssam_request_sync *rqst;
 	struct ssam_span buf;
···
 	ssam_request_sync_free(rqst);
 	return status;
 }
-EXPORT_SYMBOL_GPL(ssam_request_sync);
+EXPORT_SYMBOL_GPL(ssam_request_do_sync);
 
 /**
- * ssam_request_sync_with_buffer() - Execute a synchronous request with the
+ * ssam_request_do_sync_with_buffer() - Execute a synchronous request with the
  * provided buffer as back-end for the message buffer.
  * @ctrl: The controller via which the request will be submitted.
  * @spec: The request specification and payload.
···
  * SSH_COMMAND_MESSAGE_LENGTH() macro can be used to compute the required
  * message buffer size.
  *
- * This function does essentially the same as ssam_request_sync(), but instead
- * of dynamically allocating the request and message data buffer, it uses the
- * provided message data buffer and stores the (small) request struct on the
- * heap.
+ * This function does essentially the same as ssam_request_do_sync(), but
+ * instead of dynamically allocating the request and message data buffer, it
+ * uses the provided message data buffer and stores the (small) request struct
+ * on the heap.
  *
  * Return: Returns the status of the request or any failure during setup.
  */
-int ssam_request_sync_with_buffer(struct ssam_controller *ctrl,
-				  const struct ssam_request *spec,
-				  struct ssam_response *rsp,
-				  struct ssam_span *buf)
+int ssam_request_do_sync_with_buffer(struct ssam_controller *ctrl,
+				     const struct ssam_request *spec,
+				     struct ssam_response *rsp,
+				     struct ssam_span *buf)
 {
 	struct ssam_request_sync rqst;
 	ssize_t len;
···
 
 	return status;
 }
-EXPORT_SYMBOL_GPL(ssam_request_sync_with_buffer);
+EXPORT_SYMBOL_GPL(ssam_request_do_sync_with_buffer);
 
 
 /* -- Internal SAM requests. ------------------------------------------------ */
···
 	result.length = 0;
 	result.pointer = &buf;
 
-	status = ssam_retry(ssam_request_sync_onstack, ctrl, &rqst, &result,
+	status = ssam_retry(ssam_request_do_sync_onstack, ctrl, &rqst, &result,
 			    sizeof(params));
 
 	return status < 0 ? status : buf;

drivers/platform/surface/surface_acpi_notify.c

···
 		return san_rqst_fixup_suspended(d, &rqst, buffer);
 	}
 
-	status = __ssam_retry(ssam_request_sync_onstack, SAN_REQUEST_NUM_TRIES,
+	status = __ssam_retry(ssam_request_do_sync_onstack, SAN_REQUEST_NUM_TRIES,
 			      d->ctrl, &rqst, &rsp, SAN_GSB_MAX_RQSX_PAYLOAD);
 
 	if (!status) {

drivers/platform/surface/surface_aggregator_cdev.c

···
 		 * theoretical maximum (SSH_COMMAND_MAX_PAYLOAD_SIZE) of the
 		 * underlying protocol (note that nothing remotely this size
 		 * should ever be allocated in any normal case). This size is
-		 * validated later in ssam_request_sync(), for allocation the
-		 * bound imposed by u16 should be enough.
+		 * validated later in ssam_request_do_sync(), for allocation
+		 * the bound imposed by u16 should be enough.
 		 */
 		spec.payload = kzalloc(spec.length, GFP_KERNEL);
 		if (!spec.payload) {
···
 	}
 
 	/* Perform request. */
-	status = ssam_request_sync(client->cdev->ctrl, &spec, &rsp);
+	status = ssam_request_do_sync(client->cdev->ctrl, &spec, &rsp);
 	if (status)
 		goto out;
 

drivers/platform/surface/surface_aggregator_tabletsw.c

···
 	rsp.length = 0;
 	rsp.pointer = (u8 *)sources;
 
-	status = ssam_retry(ssam_request_sync_onstack, sw->sdev->ctrl, &rqst, &rsp, 0);
+	status = ssam_retry(ssam_request_do_sync_onstack, sw->sdev->ctrl, &rqst, &rsp, 0);
 	if (status)
 		return status;
 

include/linux/surface_aggregator/controller.h

···
 	return rqst->status;
 }
 
-int ssam_request_sync(struct ssam_controller *ctrl,
-		      const struct ssam_request *spec,
-		      struct ssam_response *rsp);
+int ssam_request_do_sync(struct ssam_controller *ctrl,
+			 const struct ssam_request *spec,
+			 struct ssam_response *rsp);
 
-int ssam_request_sync_with_buffer(struct ssam_controller *ctrl,
-				  const struct ssam_request *spec,
-				  struct ssam_response *rsp,
-				  struct ssam_span *buf);
+int ssam_request_do_sync_with_buffer(struct ssam_controller *ctrl,
+				     const struct ssam_request *spec,
+				     struct ssam_response *rsp,
+				     struct ssam_span *buf);
 
 /**
- * ssam_request_sync_onstack - Execute a synchronous request on the stack.
+ * ssam_request_do_sync_onstack - Execute a synchronous request on the stack.
  * @ctrl: The controller via which the request is submitted.
  * @rqst: The request specification.
  * @rsp:  The response buffer.
···
  * fully initializes it via the provided request specification, submits it,
  * and finally waits for its completion before returning its status. This
  * helper macro essentially allocates the request message buffer on the stack
- * and then calls ssam_request_sync_with_buffer().
+ * and then calls ssam_request_do_sync_with_buffer().
  *
  * Note: The @payload_len parameter specifies the maximum payload length, used
  * for buffer allocation. The actual payload length may be smaller.
···
  * Return: Returns the status of the request or any failure during setup, i.e.
  * zero on success and a negative value on failure.
  */
-#define ssam_request_sync_onstack(ctrl, rqst, rsp, payload_len)			\
+#define ssam_request_do_sync_onstack(ctrl, rqst, rsp, payload_len)		\
 	({									\
 		u8 __data[SSH_COMMAND_MESSAGE_LENGTH(payload_len)];		\
 		struct ssam_span __buf = { &__data[0], ARRAY_SIZE(__data) };	\
 										\
-		ssam_request_sync_with_buffer(ctrl, rqst, rsp, &__buf);		\
+		ssam_request_do_sync_with_buffer(ctrl, rqst, rsp, &__buf);	\
 	})
 
 /**
···
  * zero on success and negative on failure. The ``ctrl`` parameter is the
  * controller via which the request is being sent.
  *
- * Refer to ssam_request_sync_onstack() for more details on the behavior of
+ * Refer to ssam_request_do_sync_onstack() for more details on the behavior of
  * the generated function.
  */
 #define SSAM_DEFINE_SYNC_REQUEST_N(name, spec...)				\
···
 		rqst.length = 0;						\
 		rqst.payload = NULL;						\
 										\
-		return ssam_request_sync_onstack(ctrl, &rqst, NULL, 0);		\
+		return ssam_request_do_sync_onstack(ctrl, &rqst, NULL, 0);	\
 	}
 
 /**
···
  * parameter is the controller via which the request is sent. The request
  * argument is specified via the ``arg`` pointer.
  *
- * Refer to ssam_request_sync_onstack() for more details on the behavior of
+ * Refer to ssam_request_do_sync_onstack() for more details on the behavior of
  * the generated function.
  */
 #define SSAM_DEFINE_SYNC_REQUEST_W(name, atype, spec...)			\
···
 		rqst.length = sizeof(atype);					\
 		rqst.payload = (u8 *)arg;					\
 										\
-		return ssam_request_sync_onstack(ctrl, &rqst, NULL,		\
-						 sizeof(atype));		\
+		return ssam_request_do_sync_onstack(ctrl, &rqst, NULL,		\
+						    sizeof(atype));		\
 	}
 
 /**
···
  * the controller via which the request is sent. The request's return value is
  * written to the memory pointed to by the ``ret`` parameter.
  *
- * Refer to ssam_request_sync_onstack() for more details on the behavior of
+ * Refer to ssam_request_do_sync_onstack() for more details on the behavior of
  * the generated function.
  */
 #define SSAM_DEFINE_SYNC_REQUEST_R(name, rtype, spec...)			\
···
 		rsp.length = 0;							\
 		rsp.pointer = (u8 *)ret;					\
 										\
-		status = ssam_request_sync_onstack(ctrl, &rqst, &rsp, 0);	\
+		status = ssam_request_do_sync_onstack(ctrl, &rqst, &rsp, 0);	\
 		if (status)							\
 			return status;						\
 										\
···
  * request argument is specified via the ``arg`` pointer. The request's return
  * value is written to the memory pointed to by the ``ret`` parameter.
  *
- * Refer to ssam_request_sync_onstack() for more details on the behavior of
+ * Refer to ssam_request_do_sync_onstack() for more details on the behavior of
  * the generated function.
  */
 #define SSAM_DEFINE_SYNC_REQUEST_WR(name, atype, rtype, spec...)		\
···
 		rsp.length = 0;							\
 		rsp.pointer = (u8 *)ret;					\
 										\
-		status = ssam_request_sync_onstack(ctrl, &rqst, &rsp, sizeof(atype)); \
+		status = ssam_request_do_sync_onstack(ctrl, &rqst, &rsp, sizeof(atype)); \
 		if (status)							\
 			return status;						\
 										\
···
  * parameter is the controller via which the request is sent, ``tid`` the
  * target ID for the request, and ``iid`` the instance ID.
  *
- * Refer to ssam_request_sync_onstack() for more details on the behavior of
+ * Refer to ssam_request_do_sync_onstack() for more details on the behavior of
  * the generated function.
  */
 #define SSAM_DEFINE_SYNC_REQUEST_MD_N(name, spec...)				\
···
 		rqst.length = 0;						\
 		rqst.payload = NULL;						\
 										\
-		return ssam_request_sync_onstack(ctrl, &rqst, NULL, 0);		\
+		return ssam_request_do_sync_onstack(ctrl, &rqst, NULL, 0);	\
 	}
 
 /**
···
  * ``tid`` the target ID for the request, and ``iid`` the instance ID. The
  * request argument is specified via the ``arg`` pointer.
  *
- * Refer to ssam_request_sync_onstack() for more details on the behavior of
+ * Refer to ssam_request_do_sync_onstack() for more details on the behavior of
  * the generated function.
  */
 #define SSAM_DEFINE_SYNC_REQUEST_MD_W(name, atype, spec...)			\
···
 		rqst.length = sizeof(atype);					\
 		rqst.payload = (u8 *)arg;					\
 										\
-		return ssam_request_sync_onstack(ctrl, &rqst, NULL,		\
+		return ssam_request_do_sync_onstack(ctrl, &rqst, NULL,		\
 						 sizeof(atype));		\
 	}
 
···
  * the target ID for the request, and ``iid`` the instance ID. The request's
  * return value is written to the memory pointed to by the ``ret`` parameter.
  *
- * Refer to ssam_request_sync_onstack() for more details on the behavior of
+ * Refer to ssam_request_do_sync_onstack() for more details on the behavior of
  * the generated function.
  */
 #define SSAM_DEFINE_SYNC_REQUEST_MD_R(name, rtype, spec...)			\
···
 		rsp.length = 0;							\
 		rsp.pointer = (u8 *)ret;					\
 										\
-		status = ssam_request_sync_onstack(ctrl, &rqst, &rsp, 0);	\
+		status = ssam_request_do_sync_onstack(ctrl, &rqst, &rsp, 0);	\
 		if (status)							\
 			return status;						\
 										\
···
  * The request argument is specified via the ``arg`` pointer. The request's
  * return value is written to the memory pointed to by the ``ret`` parameter.
  *
- * Refer to ssam_request_sync_onstack() for more details on the behavior of
+ * Refer to ssam_request_do_sync_onstack() for more details on the behavior of
  * the generated function.
  */
 #define SSAM_DEFINE_SYNC_REQUEST_MD_WR(name, atype, rtype, spec...)		\
···
 		rsp.length = 0;							\
 		rsp.pointer = (u8 *)ret;					\
 										\
-		status = ssam_request_sync_onstack(ctrl, &rqst, &rsp, sizeof(atype)); \
+		status = ssam_request_do_sync_onstack(ctrl, &rqst, &rsp, sizeof(atype)); \
 		if (status)							\
 			return status;						\
 										\

include/linux/surface_aggregator/device.h

···
  * device of the request and by association the controller via which the
  * request is sent.
  *
- * Refer to ssam_request_sync_onstack() for more details on the behavior of
+ * Refer to ssam_request_do_sync_onstack() for more details on the behavior of
  * the generated function.
  */
 #define SSAM_DEFINE_SYNC_REQUEST_CL_N(name, spec...)			\
···
  * which the request is sent. The request's argument is specified via the
  * ``arg`` pointer.
  *
- * Refer to ssam_request_sync_onstack() for more details on the behavior of
+ * Refer to ssam_request_do_sync_onstack() for more details on the behavior of
  * the generated function.
  */
 #define SSAM_DEFINE_SYNC_REQUEST_CL_W(name, atype, spec...)		\
···
  * the request is sent. The request's return value is written to the memory
  * pointed to by the ``ret`` parameter.
  *
- * Refer to ssam_request_sync_onstack() for more details on the behavior of
+ * Refer to ssam_request_do_sync_onstack() for more details on the behavior of
  * the generated function.
  */
 #define SSAM_DEFINE_SYNC_REQUEST_CL_R(name, rtype, spec...)		\
···
  * specified via the ``arg`` pointer. The request's return value is written to
  * the memory pointed to by the ``ret`` parameter.
  *
- * Refer to ssam_request_sync_onstack() for more details on the behavior of
+ * Refer to ssam_request_do_sync_onstack() for more details on the behavior of
  * the generated function.
  */
 #define SSAM_DEFINE_SYNC_REQUEST_CL_WR(name, atype, rtype, spec...)		\