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From: vladimir.stankovic@displaylink.com
To: gregkh@linuxfoundation.org
Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
	mausb-host-devel@displaylink.com
Subject: [PATCH v4 1/8] usb: Add MA-USB Host kernel module
Date: Fri, 27 Mar 2020 16:26:07 +0100	[thread overview]
Message-ID: <20200327152614.26833-2-vladimir.stankovic@displaylink.com> (raw)
In-Reply-To: <20200327152614.26833-1-vladimir.stankovic@displaylink.com>

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@displaylink.com>
---
 MAINTAINERS                         |  7 +++
 drivers/usb/Kconfig                 |  2 +
 drivers/usb/Makefile                |  2 +
 drivers/usb/mausb_host/Kconfig      | 14 +++++
 drivers/usb/mausb_host/Makefile     | 12 ++++
 drivers/usb/mausb_host/mausb_core.c | 90 +++++++++++++++++++++++++++++
 drivers/usb/mausb_host/utils.c      | 85 +++++++++++++++++++++++++++
 drivers/usb/mausb_host/utils.h      | 40 +++++++++++++
 8 files changed, 252 insertions(+)
 create mode 100644 drivers/usb/mausb_host/Kconfig
 create mode 100644 drivers/usb/mausb_host/Makefile
 create mode 100644 drivers/usb/mausb_host/mausb_core.c
 create mode 100644 drivers/usb/mausb_host/utils.c
 create mode 100644 drivers/usb/mausb_host/utils.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 235ab38ed478..12aac44196d7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10226,6 +10226,13 @@ W:	https://linuxtv.org
 S:	Maintained
 F:	drivers/media/radio/radio-maxiradio*
 
+MA USB HOST DRIVER
+M:	Vladimir Stankovic <vladimir.stankovic@displaylink.com>
+L:	mausb-host-devel@displaylink.com
+W:	https://www.displaylink.com
+S:	Maintained
+F:	drivers/usb/mausb_host/*
+
 MCAN MMIO DEVICE DRIVER
 M:	Dan Murphy <dmurphy@ti.com>
 M:	Sriram Dash <sriram.dash@samsung.com>
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 275568abc670..4e92f1fa0fa5 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -164,6 +164,8 @@ source "drivers/usb/misc/Kconfig"
 
 source "drivers/usb/atm/Kconfig"
 
+source "drivers/usb/mausb_host/Kconfig"
+
 endif # USB
 
 source "drivers/usb/phy/Kconfig"
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index 1c1c1d659394..22d1998db0e2 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -66,3 +66,5 @@ obj-$(CONFIG_USBIP_CORE)	+= usbip/
 obj-$(CONFIG_TYPEC)		+= typec/
 
 obj-$(CONFIG_USB_ROLE_SWITCH)	+= roles/
+
+obj-$(CONFIG_HOST_MAUSB)        += mausb_host/
diff --git a/drivers/usb/mausb_host/Kconfig b/drivers/usb/mausb_host/Kconfig
new file mode 100644
index 000000000000..2465aac713fe
--- /dev/null
+++ b/drivers/usb/mausb_host/Kconfig
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Kernel configuration file for MA-USB Host driver.
+#
+# Copyright (c) 2019 - 2020 DisplayLink (UK) Ltd.
+#
+
+config HOST_MAUSB
+	tristate "MA-USB Host Driver"
+	depends on USB=y
+	default n
+	help
+		This is a MA-USB Host driver which enables host communication
+		via MA-USB protocol stack.
diff --git a/drivers/usb/mausb_host/Makefile b/drivers/usb/mausb_host/Makefile
new file mode 100644
index 000000000000..2e353fa0958b
--- /dev/null
+++ b/drivers/usb/mausb_host/Makefile
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for DisplayLink MA-USB Host driver.
+#
+# Copyright (c) 2019 - 2020 DisplayLink (UK) Ltd.
+#
+
+obj-$(CONFIG_HOST_MAUSB) += mausb_host.o
+mausb_host-y := mausb_core.o
+mausb_host-y += utils.o
+
+ccflags-y += -I$(srctree)/$(src)
diff --git a/drivers/usb/mausb_host/mausb_core.c b/drivers/usb/mausb_host/mausb_core.c
new file mode 100644
index 000000000000..8638dd0a4856
--- /dev/null
+++ b/drivers/usb/mausb_host/mausb_core.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 - 2020 DisplayLink (UK) Ltd.
+ */
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/kobject.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/net.h>
+
+#include "utils.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("DisplayLink (UK) Ltd.");
+MODULE_VERSION(MAUSB_DRIVER_VERSION);
+
+static int mausb_client_connect(const char *value,
+				const struct kernel_param *kp)
+{
+	mausb_pr_info("Version=%s", MAUSB_DRIVER_VERSION);
+
+	return 0;
+}
+
+static int mausb_client_disconnect(const char *value,
+				   const struct kernel_param *kp)
+{
+	mausb_pr_info("Version=%s", MAUSB_DRIVER_VERSION);
+
+	return 0;
+}
+
+static int mausb_device_connect(const char *value,
+				const struct kernel_param *kp)
+{
+	mausb_pr_info("Version=%s", MAUSB_DRIVER_VERSION);
+
+	return 0;
+}
+
+static int mausb_device_disconnect(const char *value,
+				   const struct kernel_param *kp)
+{
+	mausb_pr_info("Version=%s", MAUSB_DRIVER_VERSION);
+
+	return 0;
+}
+
+static const struct kernel_param_ops mausb_device_connect_ops = {
+	.set = mausb_device_connect
+};
+
+static const struct kernel_param_ops mausb_device_disconnect_ops = {
+	.set = mausb_device_disconnect
+};
+
+static const struct kernel_param_ops mausb_client_connect_ops = {
+	.set = mausb_client_connect
+};
+
+static const struct kernel_param_ops mausb_client_disconnect_ops = {
+	.set = mausb_client_disconnect
+};
+
+static int mausb_host_init(void)
+{
+	int status = mausb_create_dev();
+
+	mausb_pr_info("Module load. Version=%s", MAUSB_DRIVER_VERSION);
+
+	if (status < 0) {
+		mausb_pr_alert("Failed to load MAUSB module!");
+		return status;
+	}
+
+	return 0;
+}
+
+static void mausb_host_exit(void)
+{
+	mausb_pr_info("Module unloading started...");
+	mausb_cleanup_dev(1);
+	mausb_pr_info("Module unloaded. Version=%s", MAUSB_DRIVER_VERSION);
+}
+
+module_init(mausb_host_init);
+module_exit(mausb_host_exit);
diff --git a/drivers/usb/mausb_host/utils.c b/drivers/usb/mausb_host/utils.c
new file mode 100644
index 000000000000..c055b578e402
--- /dev/null
+++ b/drivers/usb/mausb_host/utils.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 - 2020 DisplayLink (UK) Ltd.
+ */
+#include "utils.h"
+
+#include <linux/atomic.h>
+#include <linux/cdev.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#define MAUSB_KERNEL_DEV_NAME "mausb_host"
+#define MAUSB_READ_DEVICE_TIMEOUT_MS 500
+
+static dev_t mausb_major_kernel;
+static struct cdev  mausb_kernel_dev;
+static struct class *mausb_kernel_class;
+
+static int mausb_file_open(struct inode *inode, struct file *filp)
+{
+	filp->private_data = NULL;
+
+	return 0;
+}
+
+static int mausb_file_close(struct inode *inode, struct file *filp)
+{
+	kfree(filp->private_data);
+	filp->private_data = NULL;
+
+	return 0;
+}
+
+static const struct file_operations mausb_file_ops = {
+	.open	 = mausb_file_open,
+	.release = mausb_file_close,
+};
+
+int mausb_create_dev(void)
+{
+	int device_created = 0;
+	int status = alloc_chrdev_region(&mausb_major_kernel, 0, 1,
+					 MAUSB_KERNEL_DEV_NAME "_proc");
+	if (status)
+		goto cleanup;
+
+	mausb_kernel_class = class_create(THIS_MODULE,
+					  MAUSB_KERNEL_DEV_NAME "_sys");
+	if (!mausb_kernel_class) {
+		status = -ENOMEM;
+		goto cleanup;
+	}
+
+	if (!device_create(mausb_kernel_class, NULL, mausb_major_kernel, NULL,
+			   MAUSB_KERNEL_DEV_NAME "_dev")) {
+		status = -ENOMEM;
+		goto cleanup;
+	}
+	device_created = 1;
+	cdev_init(&mausb_kernel_dev, &mausb_file_ops);
+	status = cdev_add(&mausb_kernel_dev, mausb_major_kernel, 1);
+	if (status)
+		goto cleanup;
+	return 0;
+cleanup:
+	mausb_cleanup_dev(device_created);
+	return status;
+}
+
+void mausb_cleanup_dev(int device_created)
+{
+	if (device_created) {
+		device_destroy(mausb_kernel_class, mausb_major_kernel);
+		cdev_del(&mausb_kernel_dev);
+	}
+
+	if (mausb_kernel_class)
+		class_destroy(mausb_kernel_class);
+
+	unregister_chrdev_region(mausb_major_kernel, 1);
+}
diff --git a/drivers/usb/mausb_host/utils.h b/drivers/usb/mausb_host/utils.h
new file mode 100644
index 000000000000..699f94fcb75b
--- /dev/null
+++ b/drivers/usb/mausb_host/utils.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2019 - 2020 DisplayLink (UK) Ltd.
+ */
+#ifndef __MAUSB_UTILS_H__
+#define __MAUSB_UTILS_H__
+
+#if defined(MAUSB_NO_LOGS)
+#define mausb_pr_logs(...)
+#else
+#include <linux/printk.h>
+#include <linux/sched.h>
+#define mausb_pr_logs(level_str, level, log, ...)\
+	pr_##level_str("MAUSB " #level " [%x:%x] [%s] " log "\n",\
+	current->pid, current->tgid, __func__, ##__VA_ARGS__)
+#endif /* MAUSB_NO_LOGS */
+
+#define mausb_pr_alert(...) mausb_pr_logs(alert, 1, ##__VA_ARGS__)
+
+#define mausb_pr_err(...) mausb_pr_logs(err, 2, ##__VA_ARGS__)
+
+#define mausb_pr_warn(...) mausb_pr_logs(warn, 3, ##__VA_ARGS__)
+
+#define mausb_pr_info(...) mausb_pr_logs(info, 4, ##__VA_ARGS__)
+
+#if defined(MAUSB_LOG_VERBOSE)
+	#define mausb_pr_debug(...) mausb_pr_logs(debug, 5, ##__VA_ARGS__)
+#else
+	#define mausb_pr_debug(...)
+#endif /* defined(MAUSB_LOG_VERBOSE) */
+
+#define MAUSB_STRINGIFY2(x) #x
+#define MAUSB_STRINGIFY(x) MAUSB_STRINGIFY2(x)
+
+#define MAUSB_DRIVER_VERSION MAUSB_STRINGIFY(1.2.0.0.36451aec)
+
+int mausb_create_dev(void);
+void mausb_cleanup_dev(int device_created);
+
+#endif /* __MAUSB_UTILS_H__ */
-- 
2.17.1


  reply	other threads:[~2020-03-27 15:26 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-12 14:42 [PATCH v3 0/8] Add MA USB Host driver Vladimir Stankovic
2020-03-27 15:26 ` [PATCH v4 " vladimir.stankovic
2020-03-27 15:26   ` vladimir.stankovic [this message]
2020-03-27 16:25     ` [PATCH v4 1/8] usb: Add MA-USB Host kernel module Alan Stern
2020-03-27 15:26   ` [PATCH v4 2/8] usb: mausb_host: Add link layer implementation vladimir.stankovic
2020-03-27 15:26   ` [PATCH v4 3/8] usb: mausb_host: HCD initialization vladimir.stankovic
2020-03-27 15:26   ` [PATCH v4 4/8] usb: mausb_host: Implement initial hub handlers vladimir.stankovic
2020-03-27 16:37     ` Alan Stern
2020-04-13 15:16       ` Vladimir Stankovic
2020-03-27 15:26   ` [PATCH v4 5/8] usb: mausb_host: Introduce PAL processing vladimir.stankovic
2020-03-27 16:35     ` Alan Stern
2020-03-28  3:56     ` kbuild test robot
2020-03-28  3:56       ` kbuild test robot
2020-03-27 15:26   ` [PATCH v4 6/8] usb: mausb_host: Add logic for PAL-to-PAL communication vladimir.stankovic
2020-03-27 15:26   ` [PATCH v4 7/8] usb: mausb_host: MA-USB PAL events processing vladimir.stankovic
2020-03-28 10:35     ` kbuild test robot
2020-03-28 10:35       ` kbuild test robot
2020-04-04 16:07     ` kbuild test robot
2020-04-04 16:07       ` kbuild test robot
2020-03-27 15:26   ` [PATCH v4 8/8] usb: mausb_host: Process MA-USB data packets vladimir.stankovic
2020-04-25  9:19   ` [PATCH v5 0/8] Add MA USB Host driver vladimir.stankovic
2020-04-25  9:19     ` [PATCH v5 1/8] usb: Add MA-USB Host kernel module vladimir.stankovic
2020-04-28 11:03       ` Greg KH
2020-04-25  9:19     ` [PATCH v5 2/8] usb: mausb_host: Add link layer implementation vladimir.stankovic
2020-04-25  9:19     ` [PATCH v5 3/8] usb: mausb_host: HCD initialization vladimir.stankovic
2020-04-28 11:07       ` Greg KH
2020-04-25  9:19     ` [PATCH v5 4/8] usb: mausb_host: Implement initial hub handlers vladimir.stankovic
2020-04-25  9:19     ` [PATCH v5 5/8] usb: mausb_host: Introduce PAL processing vladimir.stankovic
2020-04-26  0:32       ` Alan Stern
2020-04-26 12:32         ` Vladimir Stankovic
2020-04-26 14:31           ` Alan Stern
2020-04-26 14:45             ` [External] " Vladimir Stankovic
2020-04-26 20:56               ` Alan Stern
2020-04-30 14:37                 ` Vladimir Stankovic
2020-04-30 15:18                   ` Alan Stern
2020-04-30 15:34                     ` Vladimir Stankovic
2020-04-30 15:41                       ` Alan Stern
2020-04-25  9:19     ` [PATCH v5 6/8] usb: mausb_host: Add logic for PAL-to-PAL communication vladimir.stankovic
2020-04-25  9:19     ` [PATCH v5 7/8] usb: mausb_host: MA-USB PAL events processing vladimir.stankovic
2020-04-28 11:08       ` Greg KH
2020-04-25  9:19     ` [PATCH v5 8/8] usb: mausb_host: Process MA-USB data packets vladimir.stankovic
2020-04-28 11:04     ` [PATCH v5 0/8] Add MA USB Host driver Greg KH
2020-04-30 16:51       ` [External] " Vladimir Stankovic
2020-04-30 20:02         ` Greg KH
2020-05-15 13:04           ` Vladimir Stankovic
2020-05-29 12:48             ` Pavel Machek
2020-05-15 12:34     ` [PATCH v6 " Vladimir Stankovic
2020-05-15 12:34       ` [PATCH v6 1/8] usb: Add MA-USB Host kernel module Vladimir Stankovic
2020-05-15 13:01         ` Greg KH
2020-06-11 18:20           ` Vladimir Stankovic
2020-05-15 13:02         ` Greg KH
2020-06-11 18:19           ` [External] " Vladimir Stankovic
2020-05-15 12:34       ` [PATCH v6 2/8] usb: mausb_host: Add link layer implementation Vladimir Stankovic
2020-05-15 12:34       ` [PATCH v6 3/8] usb: mausb_host: HCD initialization Vladimir Stankovic
2020-05-15 13:03         ` Greg KH
2020-06-11 18:19           ` Vladimir Stankovic
2020-05-15 13:07         ` Greg KH
2020-06-11 18:18           ` [External] " Vladimir Stankovic
2020-06-18  8:18             ` Greg KH
2020-05-15 12:34       ` [PATCH v6 4/8] usb: mausb_host: Implement initial hub handlers Vladimir Stankovic
2020-05-15 12:34       ` [PATCH v6 5/8] usb: mausb_host: Introduce PAL processing Vladimir Stankovic
2020-05-15 12:35       ` [PATCH v6 6/8] usb: mausb_host: Add logic for PAL-to-PAL communication Vladimir Stankovic
2020-05-15 12:35       ` [PATCH v6 7/8] usb: mausb_host: MA-USB PAL events processing Vladimir Stankovic
2020-05-15 12:35       ` [PATCH v6 8/8] usb: mausb_host: Process MA-USB data packets Vladimir Stankovic
2020-05-15 13:08       ` [PATCH v6 0/8] Add MA USB Host driver Greg KH

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