# --- T2-COPYRIGHT-NOTE-BEGIN ---
# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
# 
# T2 SDE: architecture/powerpc64/package/.../0050-ps3sysmgr-char-device.patch
# Copyright (C) 2019 The T2 SDE Project
# 
# More information can be found in the files COPYING and README.
# 
# This patch file is dual-licensed. It is available under the license the
# patched project is licensed under, as long as it is an OpenSource license
# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
# of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
# --- T2-COPYRIGHT-NOTE-END ---

--- a/drivers/ps3/ps3-sys-manager.c
+++ b/drivers/ps3/ps3-sys-manager.c
@@ -4,6 +4,8 @@
  *
  *  Copyright (C) 2007 Sony Computer Entertainment Inc.
  *  Copyright 2007 Sony Corp.
+ *  Copyright (C) 2011 graf_chokolo <grafchokolo@gmail.com>.
+ *  Copyright (C) 2011, 2012 glevand <geoffrey.levand@mail.ru>.
  */
 
 #include <linux/kernel.h>
@@ -11,7 +13,12 @@
 #include <linux/workqueue.h>
 #include <linux/reboot.h>
 #include <linux/sched/signal.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
 
+#include <asm/atomic.h>
 #include <asm/firmware.h>
 #include <asm/lv1call.h>
 #include <asm/ps3.h>
@@ -32,6 +39,14 @@
  * specific payload.
  */
 
+#define DEVICE_NAME		"ps3sysmngr"
+
+static struct ps3sm {
+	struct ps3_system_bus_device *dev;
+	struct miscdevice misc;
+	atomic_t misc_in_use;
+} *ps3sm;
+
 /**
  * struct ps3_sys_manager_header - System manager message header.
  * @version: Header version, currently 1.
@@ -695,6 +710,86 @@ static void ps3_sys_manager_work(struct ps3_system_bus_device *dev)
 	ps3_vuart_read_async(dev, PS3_SM_RX_MSG_LEN_MIN);
 }
 
+static int ps3_sys_manager_misc_open(struct inode *inode, struct file *file)
+{
+	if (atomic_inc_return(&ps3sm->misc_in_use) == 1)
+		ps3_vuart_cancel_async(ps3sm->dev);
+
+	return 0;
+}
+
+static int ps3_sys_manager_misc_release(struct inode *inode, struct file *file)
+{
+	if (atomic_dec_and_test(&ps3sm->misc_in_use))
+		ps3_vuart_read_async(ps3sm->dev, PS3_SM_RX_MSG_LEN_MIN);
+
+	return 0;
+}
+
+static ssize_t ps3_sys_manager_misc_read(struct file *file, char __user *usrbuf,
+					 size_t count, loff_t *pos)
+{
+	char *buf;
+	int result;
+
+	buf = kmalloc(count, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	result = ps3_vuart_read(ps3sm->dev, buf, count);
+	if (result)
+		goto out;
+
+	if (copy_to_user(usrbuf, buf, count)) {
+		result = -EFAULT;
+		goto out;
+	}
+
+	result = count;
+
+out:
+
+	kfree(buf);
+
+	return result;
+}
+
+static ssize_t ps3_sys_manager_misc_write(struct file *file, const char __user *usrbuf,
+					  size_t count, loff_t *pos)
+{
+	char *buf;
+	int result;
+
+	buf = kmalloc(count, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	if (copy_from_user(buf, usrbuf, count)) {
+		result = -EFAULT;
+		goto out;
+	}
+
+	result = ps3_vuart_write(ps3sm->dev, buf, count);
+	if (result)
+		goto out;
+
+	result = count;
+
+out:
+
+	kfree(buf);
+
+	return result;
+}
+
+static const struct file_operations ps3_sys_manager_misc_fops = {
+	.owner		= THIS_MODULE,
+	.open		= ps3_sys_manager_misc_open,
+	.release	= ps3_sys_manager_misc_release,
+	.read		= ps3_sys_manager_misc_read,
+	.write		= ps3_sys_manager_misc_write,
+};
+
 static int ps3_sys_manager_probe(struct ps3_system_bus_device *dev)
 {
 	int result;
@@ -716,12 +811,47 @@ static int ps3_sys_manager_probe(struct ps3_system_bus_device *dev)
 	result = ps3_vuart_read_async(dev, PS3_SM_RX_MSG_LEN_MIN);
 	BUG_ON(result);
 
+	ps3sm = kzalloc(sizeof(*ps3sm), GFP_KERNEL);
+	if (!ps3sm)
+		goto skip_misc;
+
+	ps3sm->dev = dev;
+
+	ps3sm->misc.parent = &dev->core;
+	ps3sm->misc.minor = MISC_DYNAMIC_MINOR,
+	ps3sm->misc.name = DEVICE_NAME,
+	ps3sm->misc.fops = &ps3_sys_manager_misc_fops,
+	atomic_set(&ps3sm->misc_in_use, 0);
+
+	result = misc_register(&ps3sm->misc);
+	if (result) {
+		dev_err(&dev->core, "%s:%u: misc_register failed %d\n",
+				    __func__, __LINE__, result);
+		kfree(ps3sm);
+		ps3sm = NULL;
+		goto skip_misc;
+	}
+
+	dev_info(&dev->core, "%s:%u: registered misc device %d\n",
+		             __func__, __LINE__, ps3sm->misc.minor);
+
+skip_misc:
+
+	result = 0;
+
 	return result;
 }
 
 static int ps3_sys_manager_remove(struct ps3_system_bus_device *dev)
 {
 	dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
+
+	if (ps3sm) {
+		misc_deregister(&ps3sm->misc);
+		kfree(ps3sm);
+		ps3sm = NULL;
+	}
+
 	return 0;
 }