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// SPDX-License-Identifier: GPL-2.0+
/*
* ncm.c -- NCM gadget driver
*
* Copyright (C) 2010 Nokia Corporation
* Contact: Yauheni Kaliuta <yauheni.kaliuta@nokia.com>
*
* The driver borrows from ether.c which is:
*
* Copyright (C) 2003-2005,2008 David Brownell
* Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
* Copyright (C) 2008 Nokia Corporation
*/
/* #define DEBUG */
/* #define VERBOSE_DEBUG */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb/composite.h>
#include "u_ether.h"
#include "u_ncm.h"
#define DRIVER_DESC "NCM Gadget"
/*-------------------------------------------------------------------------*/
/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
* Instead: allocate your own, using normal USB-IF procedures.
*/
/* Thanks to NetChip Technologies for donating this product ID.
* It's for devices with only CDC Ethernet configurations.
*/
#define CDC_VENDOR_NUM 0x0525 /* NetChip */
#define CDC_PRODUCT_NUM 0xa4a1 /* Linux-USB Ethernet Gadget */
/*-------------------------------------------------------------------------*/
USB_GADGET_COMPOSITE_OPTIONS();
USB_ETHERNET_MODULE_PARAMETERS();
static struct usb_device_descriptor device_desc = {
.bLength = sizeof device_desc,
.bDescriptorType = USB_DT_DEVICE,
/* .bcdUSB = DYNAMIC */
.bDeviceClass = USB_CLASS_COMM,
.bDeviceSubClass = 0,
.bDeviceProtocol = 0,
/* .bMaxPacketSize0 = f(hardware) */
/* Vendor and product id defaults change according to what configs
* we support. (As does bNumConfigurations.) These values can
* also be overridden by module parameters.
*/
.idVendor = cpu_to_le16 (CDC_VENDOR_NUM),
.idProduct = cpu_to_le16 (CDC_PRODUCT_NUM),
/* .bcdDevice = f(hardware) */
/* .iManufacturer = DYNAMIC */
/* .iProduct = DYNAMIC */
/* NO SERIAL NUMBER */
.bNumConfigurations = 1,
};
static const struct usb_descriptor_header *otg_desc[2];
/* string IDs are assigned dynamically */
static struct usb_string strings_dev[] = {
[USB_GADGET_MANUFACTURER_IDX].s = "",
[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
[USB_GADGET_SERIAL_IDX].s = "",
{ } /* end of list */
};
static struct usb_gadget_strings stringtab_dev = {
.language = 0x0409, /* en-us */
.strings = strings_dev,
};
static struct usb_gadget_strings *dev_strings[] = {
&stringtab_dev,
NULL,
};
static struct usb_function_instance *f_ncm_inst;
static struct usb_function *f_ncm;
/*-------------------------------------------------------------------------*/
static int ncm_do_config(struct usb_configuration *c)
{
int status;
/* FIXME alloc iConfiguration string, set it in c->strings */
if (gadget_is_otg(c->cdev->gadget)) {
c->descriptors = otg_desc;
c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
}
f_ncm = usb_get_function(f_ncm_inst);
if (IS_ERR(f_ncm))
return PTR_ERR(f_ncm);
status = usb_add_function(c, f_ncm);
if (status < 0) {
usb_put_function(f_ncm);
return status;
}
return 0;
}
static struct usb_configuration ncm_config_driver = {
/* .label = f(hardware) */
.label = "CDC Ethernet (NCM)",
.bConfigurationValue = 1,
/* .iConfiguration = DYNAMIC */
.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
};
/*-------------------------------------------------------------------------*/
static int gncm_bind(struct usb_composite_dev *cdev)
{
struct usb_gadget *gadget = cdev->gadget;
struct f_ncm_opts *ncm_opts;
int status;
f_ncm_inst = usb_get_function_instance("ncm");
if (IS_ERR(f_ncm_inst))
return PTR_ERR(f_ncm_inst);
ncm_opts = container_of(f_ncm_inst, struct f_ncm_opts, func_inst);
gether_set_qmult(ncm_opts->net, qmult);
if (!gether_set_host_addr(ncm_opts->net, host_addr))
pr_info("using host ethernet address: %s", host_addr);
if (!gether_set_dev_addr(ncm_opts->net, dev_addr))
pr_info("using self ethernet address: %s", dev_addr);
/* Allocate string descriptor numbers ... note that string
* contents can be overridden by the composite_dev glue.
*/
status = usb_string_ids_tab(cdev, strings_dev);
if (status < 0)
goto fail;
device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
if (gadget_is_otg(gadget) && !otg_desc[0]) {
struct usb_descriptor_header *usb_desc;
usb_desc = usb_otg_descriptor_alloc(gadget);
if (!usb_desc)
goto fail;
usb_otg_descriptor_init(gadget, usb_desc);
otg_desc[0] = usb_desc;
otg_desc[1] = NULL;
}
status = usb_add_config(cdev, &ncm_config_driver,
ncm_do_config);
if (status < 0)
goto fail1;
usb_composite_overwrite_options(cdev, &coverwrite);
dev_info(&gadget->dev, "%s\n", DRIVER_DESC);
return 0;
fail1:
kfree(otg_desc[0]);
otg_desc[0] = NULL;
fail:
usb_put_function_instance(f_ncm_inst);
return status;
}
static int gncm_unbind(struct usb_composite_dev *cdev)
{
if (!IS_ERR_OR_NULL(f_ncm))
usb_put_function(f_ncm);
if (!IS_ERR_OR_NULL(f_ncm_inst))
usb_put_function_instance(f_ncm_inst);
kfree(otg_desc[0]);
otg_desc[0] = NULL;
return 0;
}
static struct usb_composite_driver ncm_driver = {
.name = "g_ncm",
.dev = &device_desc,
.strings = dev_strings,
.max_speed = USB_SPEED_SUPER,
.bind = gncm_bind,
.unbind = gncm_unbind,
};
module_usb_composite_driver(ncm_driver);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Yauheni Kaliuta");
MODULE_LICENSE("GPL");
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