![Sachin Kamat](/assets/img/avatar_default.png)
'eem_alloc' is local to this file. Make it static. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
663 lines
16 KiB
C
663 lines
16 KiB
C
/*
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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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#include <linux/kernel.h>
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#include <linux/module.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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#include <linux/slab.h>
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#include "u_ether.h"
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#include "u_ether_configfs.h"
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#include "u_eem.h"
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#define EEM_HLEN 2
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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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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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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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/* interface descriptor: */
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static struct usb_interface_descriptor eem_intf = {
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.bLength = sizeof eem_intf,
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.bDescriptorType = USB_DT_INTERFACE,
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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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/* full speed support: */
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static struct usb_endpoint_descriptor eem_fs_in_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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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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static struct usb_endpoint_descriptor eem_fs_out_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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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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static struct usb_descriptor_header *eem_fs_function[] = {
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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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/* high speed support: */
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static struct usb_endpoint_descriptor eem_hs_in_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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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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static struct usb_endpoint_descriptor eem_hs_out_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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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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static struct usb_descriptor_header *eem_hs_function[] = {
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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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/* super speed support: */
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static struct usb_endpoint_descriptor eem_ss_in_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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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(1024),
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};
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static struct usb_endpoint_descriptor eem_ss_out_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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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(1024),
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};
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static struct usb_ss_ep_comp_descriptor eem_ss_bulk_comp_desc = {
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.bLength = sizeof eem_ss_bulk_comp_desc,
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
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/* the following 2 values can be tweaked if necessary */
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/* .bMaxBurst = 0, */
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/* .bmAttributes = 0, */
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};
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static struct usb_descriptor_header *eem_ss_function[] = {
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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_ss_in_desc,
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(struct usb_descriptor_header *) &eem_ss_bulk_comp_desc,
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(struct usb_descriptor_header *) &eem_ss_out_desc,
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(struct usb_descriptor_header *) &eem_ss_bulk_comp_desc,
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NULL,
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};
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/* string descriptors: */
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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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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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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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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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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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/* device either stalls (value < 0) or reports success */
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return value;
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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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/* 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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if (intf == eem->ctrl_id) {
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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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if (!eem->port.in_ep->desc || !eem->port.out_ep->desc) {
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DBG(cdev, "init eem\n");
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if (config_ep_by_speed(cdev->gadget, f,
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eem->port.in_ep) ||
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config_ep_by_speed(cdev->gadget, f,
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eem->port.out_ep)) {
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eem->port.in_ep->desc = NULL;
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eem->port.out_ep->desc = NULL;
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goto fail;
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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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return 0;
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fail:
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return -EINVAL;
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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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DBG(cdev, "eem deactivated\n");
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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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/* EEM function driver setup/binding */
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static int 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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struct usb_string *us;
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int status;
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struct usb_ep *ep;
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struct f_eem_opts *eem_opts;
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eem_opts = container_of(f->fi, struct f_eem_opts, func_inst);
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/*
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* in drivers/usb/gadget/configfs.c:configfs_composite_bind()
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* configurations are bound in sequence with list_for_each_entry,
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* in each configuration its functions are bound in sequence
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* with list_for_each_entry, so we assume no race condition
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* with regard to eem_opts->bound access
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*/
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if (!eem_opts->bound) {
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mutex_lock(&eem_opts->lock);
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gether_set_gadget(eem_opts->net, cdev->gadget);
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status = gether_register_netdev(eem_opts->net);
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mutex_unlock(&eem_opts->lock);
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if (status)
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return status;
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eem_opts->bound = true;
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}
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us = usb_gstrings_attach(cdev, eem_strings,
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ARRAY_SIZE(eem_string_defs));
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if (IS_ERR(us))
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return PTR_ERR(us);
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eem_intf.iInterface = us[0].id;
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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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status = -ENODEV;
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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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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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status = -ENOMEM;
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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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eem_hs_in_desc.bEndpointAddress = eem_fs_in_desc.bEndpointAddress;
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eem_hs_out_desc.bEndpointAddress = eem_fs_out_desc.bEndpointAddress;
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eem_ss_in_desc.bEndpointAddress = eem_fs_in_desc.bEndpointAddress;
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eem_ss_out_desc.bEndpointAddress = eem_fs_out_desc.bEndpointAddress;
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status = usb_assign_descriptors(f, eem_fs_function, eem_hs_function,
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eem_ss_function);
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if (status)
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goto fail;
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DBG(cdev, "CDC Ethernet (EEM): %s speed IN/%s OUT/%s\n",
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gadget_is_superspeed(c->cdev->gadget) ? "super" :
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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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fail:
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usb_free_all_descriptors(f);
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if (eem->port.out_ep)
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eem->port.out_ep->driver_data = NULL;
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if (eem->port.in_ep)
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eem->port.in_ep->driver_data = NULL;
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ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
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return status;
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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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struct sk_buff *skb = (struct sk_buff *)req->context;
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dev_kfree_skb_any(skb);
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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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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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/* 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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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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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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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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/* 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, skb_push(skb, 2));
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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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return skb;
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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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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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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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/* 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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/* 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;
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/* EEM command packet format:
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* b0..10: bmEEMCmdParam
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* b11..13: bmEEMCmd
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* b14: reserved (must be zero)
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* b15: bmType (1 == command)
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*/
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if (header & BIT(14))
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continue;
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bmEEMCmd = (header >> 11) & 0x7;
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switch (bmEEMCmd) {
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case 0: /* echo */
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len = header & 0x7FF;
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if (skb->len < len) {
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status = -EOVERFLOW;
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goto error;
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}
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skb2 = skb_clone(skb, GFP_ATOMIC);
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if (unlikely(!skb2)) {
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DBG(cdev, "EEM echo response error\n");
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goto next;
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}
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skb_trim(skb2, len);
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put_unaligned_le16(BIT(15) | BIT(11) | len,
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skb_push(skb2, 2));
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skb_copy_bits(skb2, 0, req->buf, skb2->len);
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req->length = skb2->len;
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req->complete = eem_cmd_complete;
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req->zero = 1;
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req->context = skb2;
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if (usb_ep_queue(port->in_ep, req, GFP_ATOMIC))
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DBG(cdev, "echo response queue fail\n");
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break;
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case 1: /* echo response */
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case 2: /* suspend hint */
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case 3: /* response hint */
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case 4: /* response complete hint */
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case 5: /* tickle */
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default: /* reserved */
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continue;
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}
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} else {
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u32 crc, crc2;
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struct sk_buff *skb3;
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/* check for zero-length EEM packet */
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if (header == 0)
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continue;
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/* EEM data packet format:
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* b0..13: length of ethernet frame
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* b14: bmCRC (0 == sentinel, 1 == calculated)
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* b15: bmType (0 == data)
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*/
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len = header & 0x3FFF;
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if ((skb->len < len)
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|| (len < (ETH_HLEN + ETH_FCS_LEN))) {
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status = -EINVAL;
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goto error;
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}
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/* validate CRC */
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if (header & BIT(14)) {
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crc = get_unaligned_le32(skb->data + len
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- ETH_FCS_LEN);
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crc2 = ~crc32_le(~0,
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skb->data, len - ETH_FCS_LEN);
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} else {
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crc = get_unaligned_be32(skb->data + len
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- ETH_FCS_LEN);
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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;
|
|
}
|
|
|
|
static inline struct f_eem_opts *to_f_eem_opts(struct config_item *item)
|
|
{
|
|
return container_of(to_config_group(item), struct f_eem_opts,
|
|
func_inst.group);
|
|
}
|
|
|
|
/* f_eem_item_ops */
|
|
USB_ETHERNET_CONFIGFS_ITEM(eem);
|
|
|
|
/* f_eem_opts_dev_addr */
|
|
USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(eem);
|
|
|
|
/* f_eem_opts_host_addr */
|
|
USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(eem);
|
|
|
|
/* f_eem_opts_qmult */
|
|
USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(eem);
|
|
|
|
/* f_eem_opts_ifname */
|
|
USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(eem);
|
|
|
|
static struct configfs_attribute *eem_attrs[] = {
|
|
&f_eem_opts_dev_addr.attr,
|
|
&f_eem_opts_host_addr.attr,
|
|
&f_eem_opts_qmult.attr,
|
|
&f_eem_opts_ifname.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct config_item_type eem_func_type = {
|
|
.ct_item_ops = &eem_item_ops,
|
|
.ct_attrs = eem_attrs,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
static void eem_free_inst(struct usb_function_instance *f)
|
|
{
|
|
struct f_eem_opts *opts;
|
|
|
|
opts = container_of(f, struct f_eem_opts, func_inst);
|
|
if (opts->bound)
|
|
gether_cleanup(netdev_priv(opts->net));
|
|
else
|
|
free_netdev(opts->net);
|
|
kfree(opts);
|
|
}
|
|
|
|
static struct usb_function_instance *eem_alloc_inst(void)
|
|
{
|
|
struct f_eem_opts *opts;
|
|
|
|
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
|
|
if (!opts)
|
|
return ERR_PTR(-ENOMEM);
|
|
mutex_init(&opts->lock);
|
|
opts->func_inst.free_func_inst = eem_free_inst;
|
|
opts->net = gether_setup_default();
|
|
if (IS_ERR(opts->net)) {
|
|
struct net_device *net = opts->net;
|
|
kfree(opts);
|
|
return ERR_CAST(net);
|
|
}
|
|
|
|
config_group_init_type_name(&opts->func_inst.group, "", &eem_func_type);
|
|
|
|
return &opts->func_inst;
|
|
}
|
|
|
|
static void eem_free(struct usb_function *f)
|
|
{
|
|
struct f_eem *eem;
|
|
struct f_eem_opts *opts;
|
|
|
|
eem = func_to_eem(f);
|
|
opts = container_of(f->fi, struct f_eem_opts, func_inst);
|
|
kfree(eem);
|
|
mutex_lock(&opts->lock);
|
|
opts->refcnt--;
|
|
mutex_unlock(&opts->lock);
|
|
}
|
|
|
|
static void eem_unbind(struct usb_configuration *c, struct usb_function *f)
|
|
{
|
|
DBG(c->cdev, "eem unbind\n");
|
|
|
|
usb_free_all_descriptors(f);
|
|
}
|
|
|
|
static struct usb_function *eem_alloc(struct usb_function_instance *fi)
|
|
{
|
|
struct f_eem *eem;
|
|
struct f_eem_opts *opts;
|
|
|
|
/* allocate and initialize one new instance */
|
|
eem = kzalloc(sizeof(*eem), GFP_KERNEL);
|
|
if (!eem)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
opts = container_of(fi, struct f_eem_opts, func_inst);
|
|
mutex_lock(&opts->lock);
|
|
opts->refcnt++;
|
|
|
|
eem->port.ioport = netdev_priv(opts->net);
|
|
mutex_unlock(&opts->lock);
|
|
eem->port.cdc_filter = DEFAULT_FILTER;
|
|
|
|
eem->port.func.name = "cdc_eem";
|
|
/* 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.func.free_func = eem_free;
|
|
eem->port.wrap = eem_wrap;
|
|
eem->port.unwrap = eem_unwrap;
|
|
eem->port.header_len = EEM_HLEN;
|
|
|
|
return &eem->port.func;
|
|
}
|
|
|
|
DECLARE_USB_FUNCTION_INIT(eem, eem_alloc_inst, eem_alloc);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("David Brownell");
|