Date:   Wed, 26 Feb 2020 09:58:17 +0000
From:   Vladimir Stankovic <vladimir.stankovic@...playlink.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     linux-kernel <linux-kernel@...r.kernel.org>,
        linux-usb <linux-usb@...r.kernel.org>,
        mausb-host-devel <mausb-host-devel@...playlink.com>
Subject: [PATCH v2 3/8] usb: mausb_host: HCD initialization

Implemented HCD initialization/deinitialization functionality.

Signed-off-by: Vladimir Stankovic <vladimir.stankovic@...playlink.com>
---
  drivers/usb/mausb_host/Makefile     |   1 +
  drivers/usb/mausb_host/hcd.c        | 188 ++++++++++++++++++++++++++++
  drivers/usb/mausb_host/hcd.h        |  71 +++++++++++
  drivers/usb/mausb_host/mausb_host.c |  20 ++-
  4 files changed, 275 insertions(+), 5 deletions(-)
  create mode 100644 drivers/usb/mausb_host/hcd.c
  create mode 100644 drivers/usb/mausb_host/hcd.h

diff --git a/drivers/usb/mausb_host/Makefile 
b/drivers/usb/mausb_host/Makefile
index 4db9dbfc1ebb..855947376f71 100644
--- a/drivers/usb/mausb_host/Makefile
+++ b/drivers/usb/mausb_host/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_HOST_MAUSB) += mausb_host.o
  mausb_host-y := mausb_host.o
  mausb_host-y += utils.o
  mausb_host-y += ip_link.o
+mausb_host-y += hcd.o
   ccflags-y += -I$(srctree)/$(src)
  ccflags-y += -g
diff --git a/drivers/usb/mausb_host/hcd.c b/drivers/usb/mausb_host/hcd.c
new file mode 100644
index 000000000000..3aa548a6cb30
--- /dev/null
+++ b/drivers/usb/mausb_host/hcd.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 - 2020 DisplayLink (UK) Ltd.
+ */
+#include "hcd.h"
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/limits.h>
+#include <linux/module.h>
+
+#include "utils.h"
+
+static int mausb_open(struct inode *inode, struct file *file);
+static int mausb_release(struct inode *inode, struct file *file);
+static ssize_t mausb_read(struct file *file, char __user *buffer, 
size_t length,
+			  loff_t *offset);
+static ssize_t mausb_write(struct file *file, const char __user *buffer,
+			   size_t length, loff_t *offset);
+static long mausb_ioctl(struct file *file, unsigned int ioctl_func,
+			unsigned long ioctl_buffer);
+static int mausb_bus_probe(struct device *dev);
+static int mausb_bus_remove(struct device *dev);
+static int mausb_bus_match(struct device *dev, struct device_driver *drv);
+
+static const struct file_operations mausb_fops = {
+	.open		= mausb_open,
+	.release	= mausb_release,
+	.read		= mausb_read,
+	.write		= mausb_write,
+	.unlocked_ioctl	= mausb_ioctl
+};
+
+static unsigned int major;
+static unsigned int minor = 1;
+static dev_t devt;
+static struct device *device;
+
+struct mausb_hcd	*mhcd;
+static struct class	*mausb_class;
+static struct bus_type	mausb_bus_type = {
+	.name	= DEVICE_NAME,
+	.match	= mausb_bus_match,
+	.probe	= mausb_bus_probe,
+	.remove	= mausb_bus_remove,
+};
+
+static struct device_driver mausb_driver = {
+	.name	= DEVICE_NAME,
+	.bus	= &mausb_bus_type,
+	.owner	= THIS_MODULE,
+};
+
+static void mausb_remove(void)
+{
+	struct usb_hcd *hcd, *shared_hcd;
+
+	hcd	   = mhcd->hcd_hs_ctx->hcd;
+	shared_hcd = mhcd->hcd_ss_ctx->hcd;
+
+	if (shared_hcd) {
+		usb_remove_hcd(shared_hcd);
+		usb_put_hcd(shared_hcd);
+		mhcd->hcd_ss_ctx = NULL;
+	}
+
+	usb_remove_hcd(hcd);
+	usb_put_hcd(hcd);
+	mhcd->hcd_hs_ctx = NULL;
+}
+
+static int mausb_bus_probe(struct device *dev)
+{
+	return 0;
+}
+
+static int mausb_bus_remove(struct device *dev)
+{
+	return 0;
+}
+
+static int mausb_bus_match(struct device *dev, struct device_driver *drv)
+{
+	if (strncmp(dev->bus->name, drv->name, strlen(drv->name)))
+		return 0;
+	else
+		return 1;
+}
+
+static int mausb_open(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+static int mausb_release(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+static ssize_t mausb_read(struct file *file, char __user *buffer, 
size_t length,
+			  loff_t *offset)
+{
+	return 0;
+}
+
+static ssize_t mausb_write(struct file *file, const char __user *buffer,
+			   size_t length, loff_t *offset)
+{
+	return 0;
+}
+
+static long mausb_ioctl(struct file *file, unsigned int ioctl_func,
+			unsigned long ioctl_buffer)
+{
+	return 0;
+}
+
+int mausb_init_hcd(void)
+{
+	int retval;
+
+	retval = register_chrdev(0, DEVICE_NAME, &mausb_fops);
+	if (retval < 0) {
+		mausb_pr_err("Register_chrdev failed");
+		return retval;
+	}
+
+	major = (unsigned int)retval;
+	retval = bus_register(&mausb_bus_type);
+	if (retval) {
+		mausb_pr_err("Bus_register failed %d", retval);
+		goto bus_register_error;
+	}
+
+	mausb_class = class_create(THIS_MODULE, CLASS_NAME);
+	if (IS_ERR(mausb_class)) {
+		mausb_pr_err("Class_create failed %ld", PTR_ERR(mausb_class));
+		goto class_error;
+	}
+
+	retval = driver_register(&mausb_driver);
+	if (retval) {
+		mausb_pr_err("Driver_register failed");
+		goto driver_register_error;
+	}
+
+	mhcd = kzalloc(sizeof(*mhcd), GFP_ATOMIC);
+	if (!mhcd) {
+		retval = -ENOMEM;
+		goto mausb_hcd_alloc_failed;
+	}
+
+	devt = MKDEV(major, minor);
+	device = device_create(mausb_class, NULL, devt, mhcd, DEVICE_NAME);
+	if (IS_ERR(device)) {
+		mausb_pr_err("Device_create failed %ld", PTR_ERR(device));
+		goto device_create_error;
+	}
+
+	device->driver = &mausb_driver;
+
+	return retval;
+device_create_error:
+	kfree(mhcd);
+	mhcd = NULL;
+mausb_hcd_alloc_failed:
+	driver_unregister(&mausb_driver);
+driver_register_error:
+	class_destroy(mausb_class);
+class_error:
+	bus_unregister(&mausb_bus_type);
+bus_register_error:
+	unregister_chrdev(major, DEVICE_NAME);
+
+	return retval;
+}
+
+void mausb_deinit_hcd(void)
+{
+	if (mhcd) {
+		mausb_remove();
+		device_destroy(mausb_class, devt);
+		driver_unregister(&mausb_driver);
+		class_destroy(mausb_class);
+		bus_unregister(&mausb_bus_type);
+		unregister_chrdev(major, DEVICE_NAME);
+	}
+}
diff --git a/drivers/usb/mausb_host/hcd.h b/drivers/usb/mausb_host/hcd.h
new file mode 100644
index 000000000000..cac62ba1f1e2
--- /dev/null
+++ b/drivers/usb/mausb_host/hcd.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2019 - 2020 DisplayLink (UK) Ltd.
+ */
+#ifndef __MAUSB_HCD_H__
+#define __MAUSB_HCD_H__
+
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/major.h>
+#include <linux/proc_fs.h>
+#include <linux/rbtree.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#define DEVICE_NAME "mausb_host_hcd_dev"
+#define CLASS_NAME "mausb"
+
+#define NUMBER_OF_PORTS		15
+
+#define MAX_USB_DEVICE_DEPTH	6
+
+#define RESPONSE_TIMEOUT	5000
+
+#define MAUSB_PORT_20_STATUS_LOW_SPEED       0x0200
+#define MAUSB_PORT_20_STATUS_HIGH_SPEED      0x0400
+
+enum mausb_device_type {
+	USBDEVICE = 0,
+	USB20HUB  = 1,
+	USB30HUB  = 2
+};
+
+enum mausb_device_speed {
+	LOW_SPEED	 = 0,
+	FULL_SPEED	 = 1,
+	HIGH_SPEED	 = 2,
+	SUPER_SPEED	 = 3,
+	SUPER_SPEED_PLUS = 4
+};
+
+struct mausb_hcd {
+	spinlock_t	lock;	/* Protect HCD during URB processing */
+	struct device	*pdev;
+	u16		connected_ports;
+
+	struct rb_root	mausb_urbs;
+	struct hub_ctx	*hcd_ss_ctx;
+	struct hub_ctx	*hcd_hs_ctx;
+	struct notifier_block power_state_listener;
+};
+
+struct mausb_dev {
+	u32		port_status;
+	struct rb_root	usb_devices;
+	u8		dev_speed;
+	void		*ma_dev;
+};
+
+struct hub_ctx {
+	struct mausb_hcd *mhcd;
+	struct usb_hcd	 *hcd;
+	struct mausb_dev ma_devs[NUMBER_OF_PORTS];
+};
+
+int mausb_init_hcd(void);
+void mausb_deinit_hcd(void);
+
+#endif /* __MAUSB_HCD_H__ */
diff --git a/drivers/usb/mausb_host/mausb_host.c 
b/drivers/usb/mausb_host/mausb_host.c
index 8638dd0a4856..3ce90c29f6de 100644
--- a/drivers/usb/mausb_host/mausb_host.c
+++ b/drivers/usb/mausb_host/mausb_host.c
@@ -11,6 +11,7 @@
  #include <linux/moduleparam.h>
  #include <linux/net.h>
  +#include "hcd.h"
  #include "utils.h"
   MODULE_LICENSE("GPL");
@@ -67,21 +68,30 @@ static const struct kernel_param_ops 
mausb_client_disconnect_ops = {
   static int mausb_host_init(void)
  {
-	int status = mausb_create_dev();
+	int status;
   	mausb_pr_info("Module load. Version=%s", MAUSB_DRIVER_VERSION);
+	status = mausb_init_hcd();
+	if (status < 0)
+		goto cleanup;
  -	if (status < 0) {
-		mausb_pr_alert("Failed to load MAUSB module!");
-		return status;
-	}
+	status = mausb_create_dev();
+	if (status < 0)
+		goto cleanup_hcd;
   	return 0;
+
+cleanup_hcd:
+	mausb_deinit_hcd();
+cleanup:
+	mausb_pr_alert("Failed to load MAUSB module!");
+	return status;
  }
   static void mausb_host_exit(void)
  {
  	mausb_pr_info("Module unloading started...");
+	mausb_deinit_hcd();
  	mausb_cleanup_dev(1);
  	mausb_pr_info("Module unloaded. Version=%s", MAUSB_DRIVER_VERSION);
  }
-- 
2.17.1

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