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Subject[PATCH v4 3/8] usb: mausb_host: HCD initialization
Date
Implemented HCD initialization/deinitialization functionality.

Signed-off-by: Vladimir Stankovic <vladimir.stankovic@displaylink.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_core.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 19445b73b50b..cce4696682b2 100644
--- a/drivers/usb/mausb_host/Makefile
+++ b/drivers/usb/mausb_host/Makefile
@@ -9,5 +9,6 @@ obj-$(CONFIG_HOST_MAUSB) += mausb_host.o
mausb_host-y := mausb_core.o
mausb_host-y += utils.o
mausb_host-y += ip_link.o
+mausb_host-y += hcd.o

ccflags-y += -I$(srctree)/$(src)
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_core.c b/drivers/usb/mausb_host/mausb_core.c
index 8638dd0a4856..3ce90c29f6de 100644
--- a/drivers/usb/mausb_host/mausb_core.c
+++ b/drivers/usb/mausb_host/mausb_core.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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