staging: vc04_services: Drop vchiq_connected.[ch] files

The vchiq_connected.[ch] just implements two function:

- vchiq_add_connected_callback()
- vchiq_call_connected_callbacks()

for the deferred vchiq callbacks. Those can easily live in
vchiq_arm.[ch], hence move them. This allows making the
vchiq_call_connected_callbacks() function static.

The move doesn't copy over MAX_CALLBACKS because it is the same as
VCHIQ_DRV_MAX_CALLBACKS. Hence, it now being used in
vchiq_add_connected_callback().

No functional changes intended in this patch.

Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Link: https://lore.kernel.org/r/20240412075743.60712-6-umang.jain@ideasonboard.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/Makefile

@@ -6,7 +6,6 @@ vchiq-objs := \
    interface/vchiq_arm/vchiq_arm.o \
    interface/vchiq_arm/vchiq_bus.o \
    interface/vchiq_arm/vchiq_debugfs.o \
-   interface/vchiq_arm/vchiq_connected.o \
 
 ifdef CONFIG_VCHIQ_CDEV
 vchiq-objs += interface/vchiq_arm/vchiq_dev.o

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c

@@ -36,7 +36,6 @@
 #include "vchiq_arm.h"
 #include "vchiq_bus.h"
 #include "vchiq_debugfs.h"
-#include "vchiq_connected.h"
 #include "vchiq_pagelist.h"
 
 #define DEVICE_NAME "vchiq"
@@ -189,6 +188,56 @@ is_adjacent_block(u32 *addrs, u32 addr, unsigned int k)
 	return tmp == (addr & PAGE_MASK);
 }
 
+/*
+ * This function is called by the vchiq stack once it has been connected to
+ * the videocore and clients can start to use the stack.
+ */
+static void vchiq_call_connected_callbacks(struct vchiq_drv_mgmt *drv_mgmt)
+{
+	int i;
+
+	if (mutex_lock_killable(&drv_mgmt->connected_mutex))
+		return;
+
+	for (i = 0; i < drv_mgmt->num_deferred_callbacks; i++)
+		drv_mgmt->deferred_callback[i]();
+
+	drv_mgmt->num_deferred_callbacks = 0;
+	drv_mgmt->connected = true;
+	mutex_unlock(&drv_mgmt->connected_mutex);
+}
+
+/*
+ * This function is used to defer initialization until the vchiq stack is
+ * initialized. If the stack is already initialized, then the callback will
+ * be made immediately, otherwise it will be deferred until
+ * vchiq_call_connected_callbacks is called.
+ */
+void vchiq_add_connected_callback(struct vchiq_device *device, void (*callback)(void))
+{
+	struct vchiq_drv_mgmt *drv_mgmt = device->drv_mgmt;
+
+	if (mutex_lock_killable(&drv_mgmt->connected_mutex))
+		return;
+
+	if (drv_mgmt->connected) {
+		/* We're already connected. Call the callback immediately. */
+		callback();
+	} else {
+		if (drv_mgmt->num_deferred_callbacks >= VCHIQ_DRV_MAX_CALLBACKS) {
+			dev_err(&device->dev,
+				"core: deferred callbacks(%d) exceeded the maximum limit(%d)\n",
+				drv_mgmt->num_deferred_callbacks, VCHIQ_DRV_MAX_CALLBACKS);
+		} else {
+			drv_mgmt->deferred_callback[drv_mgmt->num_deferred_callbacks] =
+				callback;
+			drv_mgmt->num_deferred_callbacks++;
+		}
+	}
+	mutex_unlock(&drv_mgmt->connected_mutex);
+}
+EXPORT_SYMBOL(vchiq_add_connected_callback);
+
 /* There is a potential problem with partial cache lines (pages?)
  * at the ends of the block when reading. If the CPU accessed anything in
  * the same line (page?) then it may have pulled old data into the cache,

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.h

@@ -23,6 +23,7 @@
 #define VCHIQ_DRV_MAX_CALLBACKS 10
 
 struct rpi_firmware;
+struct vchiq_device;
 
 enum USE_TYPE_E {
 	USE_TYPE_SERVICE,
@@ -132,6 +133,10 @@ vchiq_instance_get_trace(struct vchiq_instance *instance);
 extern void
 vchiq_instance_set_trace(struct vchiq_instance *instance, int trace);
 
+extern void
+vchiq_add_connected_callback(struct vchiq_device *device,
+			     void (*callback)(void));
+
 #if IS_ENABLED(CONFIG_VCHIQ_CDEV)
 
 extern void

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_connected.c

@@ -1,60 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
-/* Copyright (c) 2010-2012 Broadcom. All rights reserved. */
-
-#include "vchiq_arm.h"
-#include "vchiq_connected.h"
-#include "vchiq_core.h"
-#include <linux/module.h>
-#include <linux/mutex.h>
-
-#define  MAX_CALLBACKS  10
-
-/*
- * This function is used to defer initialization until the vchiq stack is
- * initialized. If the stack is already initialized, then the callback will
- * be made immediately, otherwise it will be deferred until
- * vchiq_call_connected_callbacks is called.
- */
-void vchiq_add_connected_callback(struct vchiq_device *device, void (*callback)(void))
-{
-	struct vchiq_drv_mgmt *drv_mgmt = device->drv_mgmt;
-
-	if (mutex_lock_killable(&drv_mgmt->connected_mutex))
-		return;
-
-	if (drv_mgmt->connected) {
-		/* We're already connected. Call the callback immediately. */
-		callback();
-	} else {
-		if (drv_mgmt->num_deferred_callbacks >= MAX_CALLBACKS) {
-			dev_err(&device->dev,
-				"core: There already %d callback registered - please increase MAX_CALLBACKS\n",
-				drv_mgmt->num_deferred_callbacks);
-		} else {
-			drv_mgmt->deferred_callback[drv_mgmt->num_deferred_callbacks] =
-				callback;
-			drv_mgmt->num_deferred_callbacks++;
-		}
-	}
-	mutex_unlock(&drv_mgmt->connected_mutex);
-}
-EXPORT_SYMBOL(vchiq_add_connected_callback);
-
-/*
- * This function is called by the vchiq stack once it has been connected to
- * the videocore and clients can start to use the stack.
- */
-void vchiq_call_connected_callbacks(struct vchiq_drv_mgmt *drv_mgmt)
-{
-	int i;
-
-	if (mutex_lock_killable(&drv_mgmt->connected_mutex))
-		return;
-
-	for (i = 0; i <  drv_mgmt->num_deferred_callbacks; i++)
-		drv_mgmt->deferred_callback[i]();
-
-	drv_mgmt->num_deferred_callbacks = 0;
-	drv_mgmt->connected = true;
-	mutex_unlock(&drv_mgmt->connected_mutex);
-}

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_connected.h

@@ -1,14 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
-/* Copyright (c) 2010-2012 Broadcom. All rights reserved. */
-
-#include "vchiq_bus.h"
-
-#ifndef VCHIQ_CONNECTED_H
-#define VCHIQ_CONNECTED_H
-
-struct vchiq_drv_mgmt;
-
-void vchiq_add_connected_callback(struct vchiq_device *device, void (*callback)(void));
-void vchiq_call_connected_callbacks(struct vchiq_drv_mgmt *mgmt);
-
-#endif /* VCHIQ_CONNECTED_H */