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Date: Fri, 15 May 2020 14:34:55 +0200
From: Vladimir Stankovic <vladimir.stankovic@...playlink.com>
To: gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
mausb-host-devel@...playlink.com
Subject: [PATCH v6 1/8] usb: Add MA-USB Host kernel module
Added utility macros, kernel device creation and cleanup, functions for
handling log formatting and a placeholder module for MA-USB Host device
driver.
Signed-off-by: Vladimir Stankovic <vladimir.stankovic@...playlink.com>
---
MAINTAINERS | 7 +++++
drivers/usb/Kconfig | 2 ++
drivers/usb/Makefile | 1 +
drivers/usb/host/mausb/Kconfig | 15 +++++++++
drivers/usb/host/mausb/Makefile | 10 ++++++
drivers/usb/host/mausb/mausb_core.c | 24 +++++++++++++++
drivers/usb/host/mausb/utils.c | 47 +++++++++++++++++++++++++++++
drivers/usb/host/mausb/utils.h | 15 +++++++++
8 files changed, 121 insertions(+)
create mode 100644 drivers/usb/host/mausb/Kconfig
create mode 100644 drivers/usb/host/mausb/Makefile
create mode 100644 drivers/usb/host/mausb/mausb_core.c
create mode 100644 drivers/usb/host/mausb/utils.c
create mode 100644 drivers/usb/host/mausb/utils.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 091ec22c1a23..9b7b79215f47 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10343,6 +10343,13 @@ W: https://linuxtv.org
T: git git://linuxtv.org/media_tree.git
F: drivers/media/radio/radio-maxiradio*
+MEDIA AGNOSTIC (MA) USB HOST DRIVER
+M: Vladimir Stankovic <vladimir.stankovic@...playlink.com>
+L: mausb-host-devel@...playlink.com
+W: https://www.displaylink.com
+S: Maintained
+F: drivers/usb/host/mausb/*
+
MCAN MMIO DEVICE DRIVER
M: Dan Murphy <dmurphy@...com>
M: Sriram Dash <sriram.dash@...sung.com>
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 275568abc670..35f5c3ac6656 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -99,6 +99,8 @@ source "drivers/usb/mon/Kconfig"
source "drivers/usb/host/Kconfig"
+source "drivers/usb/host/mausb/Kconfig"
+
source "drivers/usb/renesas_usbhs/Kconfig"
source "drivers/usb/class/Kconfig"
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index 1c1c1d659394..2389b55723ab 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_USB_IMX21_HCD) += host/
obj-$(CONFIG_USB_FSL_USB2) += host/
obj-$(CONFIG_USB_FOTG210_HCD) += host/
obj-$(CONFIG_USB_MAX3421_HCD) += host/
+obj-$(CONFIG_USB_HOST_MAUSB) += host/mausb/
obj-$(CONFIG_USB_C67X00_HCD) += c67x00/
diff --git a/drivers/usb/host/mausb/Kconfig b/drivers/usb/host/mausb/Kconfig
new file mode 100644
index 000000000000..ba72ef42f942
--- /dev/null
+++ b/drivers/usb/host/mausb/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Kernel configuration file for MA-USB Host driver.
+#
+# Copyright (c) 2019 - 2020 DisplayLink (UK) Ltd.
+#
+
+config USB_HOST_MAUSB
+ tristate "Media Agnostic (MA) USB Host Driver"
+ depends on USB=y
+ help
+ This is a Media Agnostic (MA) USB Host driver which enables host
+ communication via MA USB protocol stack.
+
+ If this driver is compiled as a module, it will be named mausb_host.
diff --git a/drivers/usb/host/mausb/Makefile b/drivers/usb/host/mausb/Makefile
new file mode 100644
index 000000000000..cafccac0edba
--- /dev/null
+++ b/drivers/usb/host/mausb/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for DisplayLink MA-USB Host driver.
+#
+# Copyright (c) 2019 - 2020 DisplayLink (UK) Ltd.
+#
+
+obj-$(CONFIG_USB_HOST_MAUSB) += mausb_host.o
+mausb_host-y := mausb_core.o
+mausb_host-y += utils.o
diff --git a/drivers/usb/host/mausb/mausb_core.c b/drivers/usb/host/mausb/mausb_core.c
new file mode 100644
index 000000000000..44f76a1b74de
--- /dev/null
+++ b/drivers/usb/host/mausb/mausb_core.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 - 2020 DisplayLink (UK) Ltd.
+ */
+#include <linux/module.h>
+
+#include "utils.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("DisplayLink (UK) Ltd.");
+
+static int mausb_host_init(void)
+{
+ return mausb_host_dev_register();
+}
+
+static void mausb_host_exit(void)
+{
+ dev_info(mausb_host_dev.this_device, "Module unloading started...");
+ mausb_host_dev_deregister();
+}
+
+module_init(mausb_host_init);
+module_exit(mausb_host_exit);
diff --git a/drivers/usb/host/mausb/utils.c b/drivers/usb/host/mausb/utils.c
new file mode 100644
index 000000000000..1cfa2140311e
--- /dev/null
+++ b/drivers/usb/host/mausb/utils.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 - 2020 DisplayLink (UK) Ltd.
+ */
+#include "utils.h"
+
+#include <linux/fs.h>
+#include <linux/slab.h>
+
+#define MAUSB_KERNEL_DEV_NAME "mausb_host"
+#define MAUSB_READ_DEVICE_TIMEOUT_MS 500
+
+struct miscdevice mausb_host_dev;
+
+static int mausb_host_dev_open(struct inode *inode, struct file *filp)
+{
+ filp->private_data = NULL;
+
+ return 0;
+}
+
+static int mausb_host_dev_release(struct inode *inode, struct file *filp)
+{
+ kfree(filp->private_data);
+ filp->private_data = NULL;
+
+ return 0;
+}
+
+static const struct file_operations mausb_host_dev_fops = {
+ .open = mausb_host_dev_open,
+ .release = mausb_host_dev_release,
+};
+
+int mausb_host_dev_register(void)
+{
+ mausb_host_dev.minor = MISC_DYNAMIC_MINOR;
+ mausb_host_dev.name = MAUSB_KERNEL_DEV_NAME;
+ mausb_host_dev.fops = &mausb_host_dev_fops;
+ mausb_host_dev.mode = 0;
+ return misc_register(&mausb_host_dev);
+}
+
+void mausb_host_dev_deregister(void)
+{
+ misc_deregister(&mausb_host_dev);
+}
diff --git a/drivers/usb/host/mausb/utils.h b/drivers/usb/host/mausb/utils.h
new file mode 100644
index 000000000000..e810e691c39d
--- /dev/null
+++ b/drivers/usb/host/mausb/utils.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2019 - 2020 DisplayLink (UK) Ltd.
+ */
+#ifndef __MAUSB_UTILS_H__
+#define __MAUSB_UTILS_H__
+
+#include <linux/miscdevice.h>
+
+extern struct miscdevice mausb_host_dev;
+
+int mausb_host_dev_register(void);
+void mausb_host_dev_deregister(void);
+
+#endif /* __MAUSB_UTILS_H__ */
--
2.17.1
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