On Fri, May 15, 2020 at 02:34:55PM +0200, Vladimir Stankovic wrote:
> --- /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
Why =y? That should not be a requirement for any usb host driver.
> + 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.
Provide links to the userspace and spec here so that people have a
chance to be able to use this driver?
> 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;
You only have 1 device in the system at a time? With a global
structure? And no locking at all?
That feels _very_ wrong, why?
And mode of 0? You don't want any userspace code to use this device
node?
confused,
greg k-h
