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@@ -0,0 +1,562 @@
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+/*
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+ * f_eem.c -- USB CDC Ethernet (EEM) link function driver
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+ *
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+ * Copyright (C) 2003-2005,2008 David Brownell
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+ * Copyright (C) 2008 Nokia Corporation
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+ * Copyright (C) 2009 EF Johnson Technologies
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/device.h>
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+#include <linux/etherdevice.h>
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+#include <linux/crc32.h>
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+
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+#include "u_ether.h"
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+
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+#define EEM_HLEN 2
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+
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+/*
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+ * This function is a "CDC Ethernet Emulation Model" (CDC EEM)
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+ * Ethernet link.
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+ */
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+
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+struct eem_ep_descs {
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+ struct usb_endpoint_descriptor *in;
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+ struct usb_endpoint_descriptor *out;
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+};
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+
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+struct f_eem {
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+ struct gether port;
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+ u8 ctrl_id;
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+
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+ struct eem_ep_descs fs;
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+ struct eem_ep_descs hs;
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+};
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+
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+static inline struct f_eem *func_to_eem(struct usb_function *f)
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+{
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+ return container_of(f, struct f_eem, port.func);
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+}
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+
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+/*-------------------------------------------------------------------------*/
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+
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+/* interface descriptor: */
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+
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+static struct usb_interface_descriptor eem_intf __initdata = {
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+ .bLength = sizeof eem_intf,
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+ .bDescriptorType = USB_DT_INTERFACE,
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+
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+ /* .bInterfaceNumber = DYNAMIC */
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+ .bNumEndpoints = 2,
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+ .bInterfaceClass = USB_CLASS_COMM,
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+ .bInterfaceSubClass = USB_CDC_SUBCLASS_EEM,
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+ .bInterfaceProtocol = USB_CDC_PROTO_EEM,
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+ /* .iInterface = DYNAMIC */
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+};
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+
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+/* full speed support: */
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+
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+static struct usb_endpoint_descriptor eem_fs_in_desc __initdata = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+
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+ .bEndpointAddress = USB_DIR_IN,
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+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
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+};
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+
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+static struct usb_endpoint_descriptor eem_fs_out_desc __initdata = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+
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+ .bEndpointAddress = USB_DIR_OUT,
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+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
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+};
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+
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+static struct usb_descriptor_header *eem_fs_function[] __initdata = {
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+ /* CDC EEM control descriptors */
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+ (struct usb_descriptor_header *) &eem_intf,
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+ (struct usb_descriptor_header *) &eem_fs_in_desc,
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+ (struct usb_descriptor_header *) &eem_fs_out_desc,
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+ NULL,
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+};
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+
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+/* high speed support: */
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+
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+static struct usb_endpoint_descriptor eem_hs_in_desc __initdata = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+
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+ .bEndpointAddress = USB_DIR_IN,
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+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
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+ .wMaxPacketSize = cpu_to_le16(512),
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+};
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+
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+static struct usb_endpoint_descriptor eem_hs_out_desc __initdata = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+
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+ .bEndpointAddress = USB_DIR_OUT,
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+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
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+ .wMaxPacketSize = cpu_to_le16(512),
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+};
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+
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+static struct usb_descriptor_header *eem_hs_function[] __initdata = {
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+ /* CDC EEM control descriptors */
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+ (struct usb_descriptor_header *) &eem_intf,
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+ (struct usb_descriptor_header *) &eem_hs_in_desc,
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+ (struct usb_descriptor_header *) &eem_hs_out_desc,
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+ NULL,
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+};
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+
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+/* string descriptors: */
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+
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+static struct usb_string eem_string_defs[] = {
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+ [0].s = "CDC Ethernet Emulation Model (EEM)",
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+ { } /* end of list */
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+};
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+
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+static struct usb_gadget_strings eem_string_table = {
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+ .language = 0x0409, /* en-us */
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+ .strings = eem_string_defs,
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+};
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+
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+static struct usb_gadget_strings *eem_strings[] = {
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+ &eem_string_table,
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+ NULL,
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+};
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+
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+/*-------------------------------------------------------------------------*/
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+
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+static int eem_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
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+{
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+ struct usb_composite_dev *cdev = f->config->cdev;
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+ int value = -EOPNOTSUPP;
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+ u16 w_index = le16_to_cpu(ctrl->wIndex);
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+ u16 w_value = le16_to_cpu(ctrl->wValue);
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+ u16 w_length = le16_to_cpu(ctrl->wLength);
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+
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+ DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
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+ ctrl->bRequestType, ctrl->bRequest,
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+ w_value, w_index, w_length);
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+
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+ /* device either stalls (value < 0) or reports success */
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+ return value;
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+}
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+
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+
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+static int eem_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
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+{
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+ struct f_eem *eem = func_to_eem(f);
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+ struct usb_composite_dev *cdev = f->config->cdev;
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+ struct net_device *net;
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+
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+ /* we know alt == 0, so this is an activation or a reset */
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+ if (alt != 0)
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+ goto fail;
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+
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+ if (intf == eem->ctrl_id) {
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+
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+ if (eem->port.in_ep->driver_data) {
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+ DBG(cdev, "reset eem\n");
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+ gether_disconnect(&eem->port);
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+ }
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+
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+ if (!eem->port.in) {
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+ DBG(cdev, "init eem\n");
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+ eem->port.in = ep_choose(cdev->gadget,
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+ eem->hs.in, eem->fs.in);
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+ eem->port.out = ep_choose(cdev->gadget,
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+ eem->hs.out, eem->fs.out);
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+ }
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+
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+ /* zlps should not occur because zero-length EEM packets
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+ * will be inserted in those cases where they would occur
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+ */
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+ eem->port.is_zlp_ok = 1;
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+ eem->port.cdc_filter = DEFAULT_FILTER;
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+ DBG(cdev, "activate eem\n");
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+ net = gether_connect(&eem->port);
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+ if (IS_ERR(net))
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+ return PTR_ERR(net);
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+ } else
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+ goto fail;
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+
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+ return 0;
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+fail:
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+ return -EINVAL;
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+}
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+
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+static void eem_disable(struct usb_function *f)
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+{
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+ struct f_eem *eem = func_to_eem(f);
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+ struct usb_composite_dev *cdev = f->config->cdev;
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+
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+ DBG(cdev, "eem deactivated\n");
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+
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+ if (eem->port.in_ep->driver_data)
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+ gether_disconnect(&eem->port);
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+}
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+
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+/*-------------------------------------------------------------------------*/
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+
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+/* EEM function driver setup/binding */
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+
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+static int __init
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+eem_bind(struct usb_configuration *c, struct usb_function *f)
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+{
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+ struct usb_composite_dev *cdev = c->cdev;
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+ struct f_eem *eem = func_to_eem(f);
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+ int status;
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+ struct usb_ep *ep;
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+
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+ /* allocate instance-specific interface IDs */
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+ status = usb_interface_id(c, f);
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+ if (status < 0)
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+ goto fail;
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+ eem->ctrl_id = status;
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+ eem_intf.bInterfaceNumber = status;
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+
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+ status = -ENODEV;
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+
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+ /* allocate instance-specific endpoints */
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+ ep = usb_ep_autoconfig(cdev->gadget, &eem_fs_in_desc);
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+ if (!ep)
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+ goto fail;
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+ eem->port.in_ep = ep;
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+ ep->driver_data = cdev; /* claim */
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+
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+ ep = usb_ep_autoconfig(cdev->gadget, &eem_fs_out_desc);
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+ if (!ep)
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+ goto fail;
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+ eem->port.out_ep = ep;
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+ ep->driver_data = cdev; /* claim */
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+
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+ status = -ENOMEM;
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+
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+ /* copy descriptors, and track endpoint copies */
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+ f->descriptors = usb_copy_descriptors(eem_fs_function);
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+ if (!f->descriptors)
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+ goto fail;
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+
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+ eem->fs.in = usb_find_endpoint(eem_fs_function,
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+ f->descriptors, &eem_fs_in_desc);
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+ eem->fs.out = usb_find_endpoint(eem_fs_function,
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+ f->descriptors, &eem_fs_out_desc);
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+
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+ /* support all relevant hardware speeds... we expect that when
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+ * hardware is dual speed, all bulk-capable endpoints work at
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+ * both speeds
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+ */
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+ if (gadget_is_dualspeed(c->cdev->gadget)) {
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+ eem_hs_in_desc.bEndpointAddress =
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+ eem_fs_in_desc.bEndpointAddress;
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+ eem_hs_out_desc.bEndpointAddress =
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+ eem_fs_out_desc.bEndpointAddress;
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+
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+ /* copy descriptors, and track endpoint copies */
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+ f->hs_descriptors = usb_copy_descriptors(eem_hs_function);
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+ if (!f->hs_descriptors)
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+ goto fail;
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+
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+ eem->hs.in = usb_find_endpoint(eem_hs_function,
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+ f->hs_descriptors, &eem_hs_in_desc);
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+ eem->hs.out = usb_find_endpoint(eem_hs_function,
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+ f->hs_descriptors, &eem_hs_out_desc);
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+ }
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+
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+ DBG(cdev, "CDC Ethernet (EEM): %s speed IN/%s OUT/%s\n",
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+ gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
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+ eem->port.in_ep->name, eem->port.out_ep->name);
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+ return 0;
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+
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+fail:
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+ if (f->descriptors)
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+ usb_free_descriptors(f->descriptors);
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+
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+ /* we might as well release our claims on endpoints */
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+ if (eem->port.out)
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+ eem->port.out_ep->driver_data = NULL;
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+ if (eem->port.in)
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+ eem->port.in_ep->driver_data = NULL;
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+
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+ ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
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+
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+ return status;
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+}
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+
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+static void
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+eem_unbind(struct usb_configuration *c, struct usb_function *f)
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+{
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+ struct f_eem *eem = func_to_eem(f);
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+
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+ DBG(c->cdev, "eem unbind\n");
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+
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+ if (gadget_is_dualspeed(c->cdev->gadget))
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+ usb_free_descriptors(f->hs_descriptors);
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+ usb_free_descriptors(f->descriptors);
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+ kfree(eem);
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+}
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+
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+static void eem_cmd_complete(struct usb_ep *ep, struct usb_request *req)
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+{
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+}
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+
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+/*
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+ * Add the EEM header and ethernet checksum.
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+ * We currently do not attempt to put multiple ethernet frames
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+ * into a single USB transfer
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+ */
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+static struct sk_buff *eem_wrap(struct gether *port, struct sk_buff *skb)
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+{
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+ struct sk_buff *skb2 = NULL;
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+ struct usb_ep *in = port->in_ep;
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+ int padlen = 0;
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+ u16 len = skb->len;
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+
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+ if (!skb_cloned(skb)) {
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+ int headroom = skb_headroom(skb);
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+ int tailroom = skb_tailroom(skb);
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+
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+ /* When (len + EEM_HLEN + ETH_FCS_LEN) % in->maxpacket) is 0,
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+ * stick two bytes of zero-length EEM packet on the end.
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+ */
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+ if (((len + EEM_HLEN + ETH_FCS_LEN) % in->maxpacket) == 0)
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+ padlen += 2;
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+
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+ if ((tailroom >= (ETH_FCS_LEN + padlen)) &&
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+ (headroom >= EEM_HLEN))
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+ goto done;
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+ }
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+
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+ skb2 = skb_copy_expand(skb, EEM_HLEN, ETH_FCS_LEN + padlen, GFP_ATOMIC);
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+ dev_kfree_skb_any(skb);
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+ skb = skb2;
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+ if (!skb)
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+ return skb;
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+
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+done:
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+ /* use the "no CRC" option */
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+ put_unaligned_be32(0xdeadbeef, skb_put(skb, 4));
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+
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+ /* EEM packet header format:
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+ * b0..13: length of ethernet frame
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+ * b14: bmCRC (0 == sentinel CRC)
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+ * b15: bmType (0 == data)
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+ */
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+ len = skb->len;
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+ put_unaligned_le16((len & 0x3FFF) | BIT(14), skb_push(skb, 2));
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+
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+ /* add a zero-length EEM packet, if needed */
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+ if (padlen)
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+ put_unaligned_le16(0, skb_put(skb, 2));
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+
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+ return skb;
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+}
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+
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+/*
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+ * Remove the EEM header. Note that there can be many EEM packets in a single
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+ * USB transfer, so we need to break them out and handle them independently.
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+ */
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+static int eem_unwrap(struct gether *port,
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+ struct sk_buff *skb,
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+ struct sk_buff_head *list)
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+{
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+ struct usb_composite_dev *cdev = port->func.config->cdev;
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+ int status = 0;
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+
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+ do {
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+ struct sk_buff *skb2;
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+ u16 header;
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+ u16 len = 0;
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+
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+ if (skb->len < EEM_HLEN) {
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+ status = -EINVAL;
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+ DBG(cdev, "invalid EEM header\n");
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+ goto error;
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+ }
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+
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+ /* remove the EEM header */
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+ header = get_unaligned_le16(skb->data);
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+ skb_pull(skb, EEM_HLEN);
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+
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+ /* EEM packet header format:
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+ * b0..14: EEM type dependent (data or command)
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+ * b15: bmType (0 == data, 1 == command)
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+ */
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+ if (header & BIT(15)) {
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+ struct usb_request *req = cdev->req;
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|
|
+ u16 bmEEMCmd;
|
|
|
+
|
|
|
+ /* EEM command packet format:
|
|
|
+ * b0..10: bmEEMCmdParam
|
|
|
+ * b11..13: bmEEMCmd
|
|
|
+ * b14: reserved (must be zero)
|
|
|
+ * b15: bmType (1 == command)
|
|
|
+ */
|
|
|
+ if (header & BIT(14))
|
|
|
+ continue;
|
|
|
+
|
|
|
+ bmEEMCmd = (header >> 11) & 0x7;
|
|
|
+ switch (bmEEMCmd) {
|
|
|
+ case 0: /* echo */
|
|
|
+ len = header & 0x7FF;
|
|
|
+ if (skb->len < len) {
|
|
|
+ status = -EOVERFLOW;
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+
|
|
|
+ skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
|
+ if (unlikely(!skb2)) {
|
|
|
+ DBG(cdev, "EEM echo response error\n");
|
|
|
+ goto next;
|
|
|
+ }
|
|
|
+ skb_trim(skb2, len);
|
|
|
+ put_unaligned_le16(BIT(15) | BIT(11) | len,
|
|
|
+ skb_push(skb2, 2));
|
|
|
+ skb_copy_bits(skb, 0, req->buf, skb->len);
|
|
|
+ req->length = skb->len;
|
|
|
+ req->complete = eem_cmd_complete;
|
|
|
+ req->zero = 1;
|
|
|
+ if (usb_ep_queue(port->in_ep, req, GFP_ATOMIC))
|
|
|
+ DBG(cdev, "echo response queue fail\n");
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 1: /* echo response */
|
|
|
+ case 2: /* suspend hint */
|
|
|
+ case 3: /* response hint */
|
|
|
+ case 4: /* response complete hint */
|
|
|
+ case 5: /* tickle */
|
|
|
+ default: /* reserved */
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ u32 crc, crc2;
|
|
|
+ struct sk_buff *skb3;
|
|
|
+
|
|
|
+ /* check for zero-length EEM packet */
|
|
|
+ if (header == 0)
|
|
|
+ continue;
|
|
|
+
|
|
|
+ /* EEM data packet format:
|
|
|
+ * b0..13: length of ethernet frame
|
|
|
+ * b14: bmCRC (0 == sentinel, 1 == calculated)
|
|
|
+ * b15: bmType (0 == data)
|
|
|
+ */
|
|
|
+ len = header & 0x3FFF;
|
|
|
+ if ((skb->len < len)
|
|
|
+ || (len < (ETH_HLEN + ETH_FCS_LEN))) {
|
|
|
+ status = -EINVAL;
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* validate CRC */
|
|
|
+ crc = get_unaligned_le32(skb->data + len - ETH_FCS_LEN);
|
|
|
+ if (header & BIT(14)) {
|
|
|
+ crc = get_unaligned_le32(skb->data + len
|
|
|
+ - ETH_FCS_LEN);
|
|
|
+ crc2 = ~crc32_le(~0,
|
|
|
+ skb->data,
|
|
|
+ skb->len - ETH_FCS_LEN);
|
|
|
+ } else {
|
|
|
+ crc = get_unaligned_be32(skb->data + len
|
|
|
+ - ETH_FCS_LEN);
|
|
|
+ crc2 = 0xdeadbeef;
|
|
|
+ }
|
|
|
+ if (crc != crc2) {
|
|
|
+ DBG(cdev, "invalid EEM CRC\n");
|
|
|
+ goto next;
|
|
|
+ }
|
|
|
+
|
|
|
+ skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
|
+ if (unlikely(!skb2)) {
|
|
|
+ DBG(cdev, "unable to unframe EEM packet\n");
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ skb_trim(skb2, len - ETH_FCS_LEN);
|
|
|
+
|
|
|
+ skb3 = skb_copy_expand(skb2,
|
|
|
+ NET_IP_ALIGN,
|
|
|
+ 0,
|
|
|
+ GFP_ATOMIC);
|
|
|
+ if (unlikely(!skb3)) {
|
|
|
+ DBG(cdev, "unable to realign EEM packet\n");
|
|
|
+ dev_kfree_skb_any(skb2);
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ dev_kfree_skb_any(skb2);
|
|
|
+ skb_queue_tail(list, skb3);
|
|
|
+ }
|
|
|
+next:
|
|
|
+ skb_pull(skb, len);
|
|
|
+ } while (skb->len);
|
|
|
+
|
|
|
+error:
|
|
|
+ dev_kfree_skb_any(skb);
|
|
|
+ return status;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * eem_bind_config - add CDC Ethernet (EEM) network link to a configuration
|
|
|
+ * @c: the configuration to support the network link
|
|
|
+ * Context: single threaded during gadget setup
|
|
|
+ *
|
|
|
+ * Returns zero on success, else negative errno.
|
|
|
+ *
|
|
|
+ * Caller must have called @gether_setup(). Caller is also responsible
|
|
|
+ * for calling @gether_cleanup() before module unload.
|
|
|
+ */
|
|
|
+int __init eem_bind_config(struct usb_configuration *c)
|
|
|
+{
|
|
|
+ struct f_eem *eem;
|
|
|
+ int status;
|
|
|
+
|
|
|
+ /* maybe allocate device-global string IDs */
|
|
|
+ if (eem_string_defs[0].id == 0) {
|
|
|
+
|
|
|
+ /* control interface label */
|
|
|
+ status = usb_string_id(c->cdev);
|
|
|
+ if (status < 0)
|
|
|
+ return status;
|
|
|
+ eem_string_defs[0].id = status;
|
|
|
+ eem_intf.iInterface = status;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* allocate and initialize one new instance */
|
|
|
+ eem = kzalloc(sizeof *eem, GFP_KERNEL);
|
|
|
+ if (!eem)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ eem->port.cdc_filter = DEFAULT_FILTER;
|
|
|
+
|
|
|
+ eem->port.func.name = "cdc_eem";
|
|
|
+ eem->port.func.strings = eem_strings;
|
|
|
+ /* descriptors are per-instance copies */
|
|
|
+ eem->port.func.bind = eem_bind;
|
|
|
+ eem->port.func.unbind = eem_unbind;
|
|
|
+ eem->port.func.set_alt = eem_set_alt;
|
|
|
+ eem->port.func.setup = eem_setup;
|
|
|
+ eem->port.func.disable = eem_disable;
|
|
|
+ eem->port.wrap = eem_wrap;
|
|
|
+ eem->port.unwrap = eem_unwrap;
|
|
|
+ eem->port.header_len = EEM_HLEN;
|
|
|
+
|
|
|
+ status = usb_add_function(c, &eem->port.func);
|
|
|
+ if (status)
|
|
|
+ kfree(eem);
|
|
|
+ return status;
|
|
|
+}
|
|
|
+
|
Brian Niebuhr