733 lines
17 KiB
C
733 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* f_phonet.c -- USB CDC Phonet function
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*
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* Copyright (C) 2007-2008 Nokia Corporation. All rights reserved.
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*
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* Author: Rémi Denis-Courmont
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*/
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#include <linux/mm.h>
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#include <linux/slab.h>
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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/netdevice.h>
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#include <linux/if_ether.h>
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#include <linux/if_phonet.h>
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#include <linux/if_arp.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/cdc.h>
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#include <linux/usb/composite.h>
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#include "u_phonet.h"
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#include "u_ether.h"
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#define PN_MEDIA_USB 0x1B
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#define MAXPACKET 512
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#if (PAGE_SIZE % MAXPACKET)
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#error MAXPACKET must divide PAGE_SIZE!
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#endif
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/*-------------------------------------------------------------------------*/
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struct phonet_port {
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struct f_phonet *usb;
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spinlock_t lock;
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};
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struct f_phonet {
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struct usb_function function;
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struct {
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struct sk_buff *skb;
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spinlock_t lock;
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} rx;
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struct net_device *dev;
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struct usb_ep *in_ep, *out_ep;
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struct usb_request *in_req;
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struct usb_request *out_reqv[];
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};
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static int phonet_rxq_size = 17;
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static inline struct f_phonet *func_to_pn(struct usb_function *f)
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{
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return container_of(f, struct f_phonet, function);
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}
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/*-------------------------------------------------------------------------*/
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#define USB_CDC_SUBCLASS_PHONET 0xfe
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#define USB_CDC_PHONET_TYPE 0xab
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static struct usb_interface_descriptor
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pn_control_intf_desc = {
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.bLength = sizeof pn_control_intf_desc,
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.bDescriptorType = USB_DT_INTERFACE,
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/* .bInterfaceNumber = DYNAMIC, */
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.bInterfaceClass = USB_CLASS_COMM,
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.bInterfaceSubClass = USB_CDC_SUBCLASS_PHONET,
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};
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static const struct usb_cdc_header_desc
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pn_header_desc = {
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.bLength = sizeof pn_header_desc,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_CDC_HEADER_TYPE,
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.bcdCDC = cpu_to_le16(0x0110),
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};
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static const struct usb_cdc_header_desc
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pn_phonet_desc = {
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.bLength = sizeof pn_phonet_desc,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_CDC_PHONET_TYPE,
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.bcdCDC = cpu_to_le16(0x1505), /* ??? */
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};
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static struct usb_cdc_union_desc
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pn_union_desc = {
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.bLength = sizeof pn_union_desc,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_CDC_UNION_TYPE,
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/* .bMasterInterface0 = DYNAMIC, */
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/* .bSlaveInterface0 = DYNAMIC, */
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};
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static struct usb_interface_descriptor
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pn_data_nop_intf_desc = {
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.bLength = sizeof pn_data_nop_intf_desc,
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.bDescriptorType = USB_DT_INTERFACE,
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/* .bInterfaceNumber = DYNAMIC, */
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.bAlternateSetting = 0,
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.bNumEndpoints = 0,
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.bInterfaceClass = USB_CLASS_CDC_DATA,
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};
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static struct usb_interface_descriptor
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pn_data_intf_desc = {
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.bLength = sizeof pn_data_intf_desc,
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.bDescriptorType = USB_DT_INTERFACE,
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/* .bInterfaceNumber = DYNAMIC, */
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.bAlternateSetting = 1,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_CDC_DATA,
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};
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static struct usb_endpoint_descriptor
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pn_fs_sink_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_endpoint_descriptor
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pn_hs_sink_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(MAXPACKET),
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};
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static struct usb_endpoint_descriptor
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pn_fs_source_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
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pn_hs_source_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_descriptor_header *fs_pn_function[] = {
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(struct usb_descriptor_header *) &pn_control_intf_desc,
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(struct usb_descriptor_header *) &pn_header_desc,
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(struct usb_descriptor_header *) &pn_phonet_desc,
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(struct usb_descriptor_header *) &pn_union_desc,
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(struct usb_descriptor_header *) &pn_data_nop_intf_desc,
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(struct usb_descriptor_header *) &pn_data_intf_desc,
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(struct usb_descriptor_header *) &pn_fs_sink_desc,
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(struct usb_descriptor_header *) &pn_fs_source_desc,
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NULL,
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};
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static struct usb_descriptor_header *hs_pn_function[] = {
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(struct usb_descriptor_header *) &pn_control_intf_desc,
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(struct usb_descriptor_header *) &pn_header_desc,
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(struct usb_descriptor_header *) &pn_phonet_desc,
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(struct usb_descriptor_header *) &pn_union_desc,
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(struct usb_descriptor_header *) &pn_data_nop_intf_desc,
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(struct usb_descriptor_header *) &pn_data_intf_desc,
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(struct usb_descriptor_header *) &pn_hs_sink_desc,
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(struct usb_descriptor_header *) &pn_hs_source_desc,
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NULL,
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};
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/*-------------------------------------------------------------------------*/
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static int pn_net_open(struct net_device *dev)
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{
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netif_wake_queue(dev);
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return 0;
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}
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static int pn_net_close(struct net_device *dev)
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{
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netif_stop_queue(dev);
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return 0;
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}
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static void pn_tx_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct f_phonet *fp = ep->driver_data;
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struct net_device *dev = fp->dev;
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struct sk_buff *skb = req->context;
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switch (req->status) {
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case 0:
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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break;
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case -ESHUTDOWN: /* disconnected */
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case -ECONNRESET: /* disabled */
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dev->stats.tx_aborted_errors++;
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fallthrough;
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default:
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dev->stats.tx_errors++;
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}
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dev_kfree_skb_any(skb);
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netif_wake_queue(dev);
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}
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static netdev_tx_t pn_net_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct phonet_port *port = netdev_priv(dev);
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struct f_phonet *fp;
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struct usb_request *req;
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unsigned long flags;
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if (skb->protocol != htons(ETH_P_PHONET))
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goto out;
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spin_lock_irqsave(&port->lock, flags);
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fp = port->usb;
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if (unlikely(!fp)) /* race with carrier loss */
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goto out_unlock;
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req = fp->in_req;
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req->buf = skb->data;
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req->length = skb->len;
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req->complete = pn_tx_complete;
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req->zero = 1;
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req->context = skb;
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if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC)))
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goto out_unlock;
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netif_stop_queue(dev);
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skb = NULL;
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out_unlock:
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spin_unlock_irqrestore(&port->lock, flags);
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out:
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if (unlikely(skb)) {
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dev_kfree_skb(skb);
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dev->stats.tx_dropped++;
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}
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return NETDEV_TX_OK;
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}
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static const struct net_device_ops pn_netdev_ops = {
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.ndo_open = pn_net_open,
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.ndo_stop = pn_net_close,
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.ndo_start_xmit = pn_net_xmit,
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};
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static void pn_net_setup(struct net_device *dev)
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{
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const u8 addr = PN_MEDIA_USB;
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dev->features = 0;
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dev->type = ARPHRD_PHONET;
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dev->flags = IFF_POINTOPOINT | IFF_NOARP;
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dev->mtu = PHONET_DEV_MTU;
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dev->min_mtu = PHONET_MIN_MTU;
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dev->max_mtu = PHONET_MAX_MTU;
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dev->hard_header_len = 1;
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dev->addr_len = 1;
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dev_addr_set(dev, &addr);
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dev->tx_queue_len = 1;
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dev->netdev_ops = &pn_netdev_ops;
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dev->needs_free_netdev = true;
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dev->header_ops = &phonet_header_ops;
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}
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/*-------------------------------------------------------------------------*/
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/*
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* Queue buffer for data from the host
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*/
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static int
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pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags)
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{
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struct page *page;
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int err;
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page = __dev_alloc_page(gfp_flags | __GFP_NOMEMALLOC);
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if (!page)
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return -ENOMEM;
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req->buf = page_address(page);
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req->length = PAGE_SIZE;
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req->context = page;
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err = usb_ep_queue(fp->out_ep, req, gfp_flags);
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if (unlikely(err))
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put_page(page);
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return err;
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}
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static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct f_phonet *fp = ep->driver_data;
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struct net_device *dev = fp->dev;
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struct page *page = req->context;
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struct sk_buff *skb;
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unsigned long flags;
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int status = req->status;
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switch (status) {
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case 0:
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spin_lock_irqsave(&fp->rx.lock, flags);
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skb = fp->rx.skb;
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if (!skb)
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skb = fp->rx.skb = netdev_alloc_skb(dev, 12);
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if (req->actual < req->length) /* Last fragment */
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fp->rx.skb = NULL;
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spin_unlock_irqrestore(&fp->rx.lock, flags);
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if (unlikely(!skb))
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break;
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if (skb->len == 0) { /* First fragment */
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skb->protocol = htons(ETH_P_PHONET);
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skb_reset_mac_header(skb);
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/* Can't use pskb_pull() on page in IRQ */
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skb_put_data(skb, page_address(page), 1);
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}
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skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
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skb->len <= 1, req->actual, PAGE_SIZE);
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page = NULL;
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if (req->actual < req->length) { /* Last fragment */
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skb->dev = dev;
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dev->stats.rx_packets++;
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dev->stats.rx_bytes += skb->len;
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netif_rx(skb);
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}
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break;
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/* Do not resubmit in these cases: */
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case -ESHUTDOWN: /* disconnect */
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case -ECONNABORTED: /* hw reset */
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case -ECONNRESET: /* dequeued (unlink or netif down) */
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req = NULL;
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break;
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/* Do resubmit in these cases: */
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case -EOVERFLOW: /* request buffer overflow */
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dev->stats.rx_over_errors++;
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fallthrough;
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default:
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dev->stats.rx_errors++;
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break;
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}
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if (page)
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put_page(page);
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if (req)
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pn_rx_submit(fp, req, GFP_ATOMIC);
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}
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/*-------------------------------------------------------------------------*/
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static void __pn_reset(struct usb_function *f)
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{
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struct f_phonet *fp = func_to_pn(f);
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struct net_device *dev = fp->dev;
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struct phonet_port *port = netdev_priv(dev);
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netif_carrier_off(dev);
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port->usb = NULL;
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usb_ep_disable(fp->out_ep);
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usb_ep_disable(fp->in_ep);
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if (fp->rx.skb) {
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dev_kfree_skb_irq(fp->rx.skb);
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fp->rx.skb = NULL;
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}
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}
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static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
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{
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struct f_phonet *fp = func_to_pn(f);
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struct usb_gadget *gadget = fp->function.config->cdev->gadget;
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if (intf == pn_control_intf_desc.bInterfaceNumber)
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/* control interface, no altsetting */
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return (alt > 0) ? -EINVAL : 0;
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if (intf == pn_data_intf_desc.bInterfaceNumber) {
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struct net_device *dev = fp->dev;
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struct phonet_port *port = netdev_priv(dev);
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/* data intf (0: inactive, 1: active) */
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if (alt > 1)
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return -EINVAL;
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spin_lock(&port->lock);
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if (fp->in_ep->enabled)
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__pn_reset(f);
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if (alt == 1) {
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int i;
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if (config_ep_by_speed(gadget, f, fp->in_ep) ||
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config_ep_by_speed(gadget, f, fp->out_ep)) {
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fp->in_ep->desc = NULL;
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fp->out_ep->desc = NULL;
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spin_unlock(&port->lock);
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return -EINVAL;
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}
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usb_ep_enable(fp->out_ep);
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usb_ep_enable(fp->in_ep);
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port->usb = fp;
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fp->out_ep->driver_data = fp;
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fp->in_ep->driver_data = fp;
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netif_carrier_on(dev);
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for (i = 0; i < phonet_rxq_size; i++)
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pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC);
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}
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spin_unlock(&port->lock);
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return 0;
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}
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return -EINVAL;
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}
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static int pn_get_alt(struct usb_function *f, unsigned intf)
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{
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struct f_phonet *fp = func_to_pn(f);
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if (intf == pn_control_intf_desc.bInterfaceNumber)
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return 0;
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if (intf == pn_data_intf_desc.bInterfaceNumber) {
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struct phonet_port *port = netdev_priv(fp->dev);
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u8 alt;
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spin_lock(&port->lock);
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alt = port->usb != NULL;
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spin_unlock(&port->lock);
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return alt;
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}
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|
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return -EINVAL;
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}
|
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|
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static void pn_disconnect(struct usb_function *f)
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{
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struct f_phonet *fp = func_to_pn(f);
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struct phonet_port *port = netdev_priv(fp->dev);
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unsigned long flags;
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/* remain disabled until set_alt */
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spin_lock_irqsave(&port->lock, flags);
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__pn_reset(f);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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/*-------------------------------------------------------------------------*/
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static int pn_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 usb_gadget *gadget = cdev->gadget;
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struct f_phonet *fp = func_to_pn(f);
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struct usb_ep *ep;
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int status, i;
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struct f_phonet_opts *phonet_opts;
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phonet_opts = container_of(f->fi, struct f_phonet_opts, func_inst);
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|
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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 phonet_opts->bound access
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*/
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if (!phonet_opts->bound) {
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gphonet_set_gadget(phonet_opts->net, gadget);
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status = gphonet_register_netdev(phonet_opts->net);
|
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if (status)
|
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return status;
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phonet_opts->bound = true;
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}
|
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|
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/* Reserve interface IDs */
|
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status = usb_interface_id(c, f);
|
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if (status < 0)
|
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goto err;
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pn_control_intf_desc.bInterfaceNumber = status;
|
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pn_union_desc.bMasterInterface0 = status;
|
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|
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status = usb_interface_id(c, f);
|
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if (status < 0)
|
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goto err;
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pn_data_nop_intf_desc.bInterfaceNumber = status;
|
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pn_data_intf_desc.bInterfaceNumber = status;
|
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pn_union_desc.bSlaveInterface0 = status;
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|
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/* Reserve endpoints */
|
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status = -ENODEV;
|
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ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc);
|
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if (!ep)
|
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goto err;
|
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fp->out_ep = ep;
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|
|
ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
|
|
if (!ep)
|
|
goto err;
|
|
fp->in_ep = ep;
|
|
|
|
pn_hs_sink_desc.bEndpointAddress = pn_fs_sink_desc.bEndpointAddress;
|
|
pn_hs_source_desc.bEndpointAddress = pn_fs_source_desc.bEndpointAddress;
|
|
|
|
/* Do not try to bind Phonet twice... */
|
|
status = usb_assign_descriptors(f, fs_pn_function, hs_pn_function,
|
|
NULL, NULL);
|
|
if (status)
|
|
goto err;
|
|
|
|
/* Incoming USB requests */
|
|
status = -ENOMEM;
|
|
for (i = 0; i < phonet_rxq_size; i++) {
|
|
struct usb_request *req;
|
|
|
|
req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL);
|
|
if (!req)
|
|
goto err_req;
|
|
|
|
req->complete = pn_rx_complete;
|
|
fp->out_reqv[i] = req;
|
|
}
|
|
|
|
/* Outgoing USB requests */
|
|
fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL);
|
|
if (!fp->in_req)
|
|
goto err_req;
|
|
|
|
INFO(cdev, "USB CDC Phonet function\n");
|
|
INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name,
|
|
fp->out_ep->name, fp->in_ep->name);
|
|
return 0;
|
|
|
|
err_req:
|
|
for (i = 0; i < phonet_rxq_size && fp->out_reqv[i]; i++)
|
|
usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
|
|
usb_free_all_descriptors(f);
|
|
err:
|
|
ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
|
|
return status;
|
|
}
|
|
|
|
static inline struct f_phonet_opts *to_f_phonet_opts(struct config_item *item)
|
|
{
|
|
return container_of(to_config_group(item), struct f_phonet_opts,
|
|
func_inst.group);
|
|
}
|
|
|
|
static void phonet_attr_release(struct config_item *item)
|
|
{
|
|
struct f_phonet_opts *opts = to_f_phonet_opts(item);
|
|
|
|
usb_put_function_instance(&opts->func_inst);
|
|
}
|
|
|
|
static struct configfs_item_operations phonet_item_ops = {
|
|
.release = phonet_attr_release,
|
|
};
|
|
|
|
static ssize_t f_phonet_ifname_show(struct config_item *item, char *page)
|
|
{
|
|
return gether_get_ifname(to_f_phonet_opts(item)->net, page, PAGE_SIZE);
|
|
}
|
|
|
|
CONFIGFS_ATTR_RO(f_phonet_, ifname);
|
|
|
|
static struct configfs_attribute *phonet_attrs[] = {
|
|
&f_phonet_attr_ifname,
|
|
NULL,
|
|
};
|
|
|
|
static const struct config_item_type phonet_func_type = {
|
|
.ct_item_ops = &phonet_item_ops,
|
|
.ct_attrs = phonet_attrs,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
static void phonet_free_inst(struct usb_function_instance *f)
|
|
{
|
|
struct f_phonet_opts *opts;
|
|
|
|
opts = container_of(f, struct f_phonet_opts, func_inst);
|
|
if (opts->bound)
|
|
gphonet_cleanup(opts->net);
|
|
else
|
|
free_netdev(opts->net);
|
|
kfree(opts);
|
|
}
|
|
|
|
static struct usb_function_instance *phonet_alloc_inst(void)
|
|
{
|
|
struct f_phonet_opts *opts;
|
|
|
|
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
|
|
if (!opts)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
opts->func_inst.free_func_inst = phonet_free_inst;
|
|
opts->net = gphonet_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, "",
|
|
&phonet_func_type);
|
|
|
|
return &opts->func_inst;
|
|
}
|
|
|
|
static void phonet_free(struct usb_function *f)
|
|
{
|
|
struct f_phonet *phonet;
|
|
|
|
phonet = func_to_pn(f);
|
|
kfree(phonet);
|
|
}
|
|
|
|
static void pn_unbind(struct usb_configuration *c, struct usb_function *f)
|
|
{
|
|
struct f_phonet *fp = func_to_pn(f);
|
|
int i;
|
|
|
|
/* We are already disconnected */
|
|
if (fp->in_req)
|
|
usb_ep_free_request(fp->in_ep, fp->in_req);
|
|
for (i = 0; i < phonet_rxq_size; i++)
|
|
if (fp->out_reqv[i])
|
|
usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
|
|
|
|
usb_free_all_descriptors(f);
|
|
}
|
|
|
|
static struct usb_function *phonet_alloc(struct usb_function_instance *fi)
|
|
{
|
|
struct f_phonet *fp;
|
|
struct f_phonet_opts *opts;
|
|
|
|
fp = kzalloc(struct_size(fp, out_reqv, phonet_rxq_size), GFP_KERNEL);
|
|
if (!fp)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
opts = container_of(fi, struct f_phonet_opts, func_inst);
|
|
|
|
fp->dev = opts->net;
|
|
fp->function.name = "phonet";
|
|
fp->function.bind = pn_bind;
|
|
fp->function.unbind = pn_unbind;
|
|
fp->function.set_alt = pn_set_alt;
|
|
fp->function.get_alt = pn_get_alt;
|
|
fp->function.disable = pn_disconnect;
|
|
fp->function.free_func = phonet_free;
|
|
spin_lock_init(&fp->rx.lock);
|
|
|
|
return &fp->function;
|
|
}
|
|
|
|
struct net_device *gphonet_setup_default(void)
|
|
{
|
|
struct net_device *dev;
|
|
struct phonet_port *port;
|
|
|
|
/* Create net device */
|
|
dev = alloc_netdev(sizeof(*port), "upnlink%d", NET_NAME_UNKNOWN,
|
|
pn_net_setup);
|
|
if (!dev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
port = netdev_priv(dev);
|
|
spin_lock_init(&port->lock);
|
|
netif_carrier_off(dev);
|
|
|
|
return dev;
|
|
}
|
|
|
|
void gphonet_set_gadget(struct net_device *net, struct usb_gadget *g)
|
|
{
|
|
SET_NETDEV_DEV(net, &g->dev);
|
|
}
|
|
|
|
int gphonet_register_netdev(struct net_device *net)
|
|
{
|
|
int status;
|
|
|
|
status = register_netdev(net);
|
|
if (status)
|
|
free_netdev(net);
|
|
|
|
return status;
|
|
}
|
|
|
|
void gphonet_cleanup(struct net_device *dev)
|
|
{
|
|
unregister_netdev(dev);
|
|
}
|
|
|
|
DECLARE_USB_FUNCTION_INIT(phonet, phonet_alloc_inst, phonet_alloc);
|
|
MODULE_AUTHOR("Rémi Denis-Courmont");
|
|
MODULE_LICENSE("GPL");
|