434 lines
9.9 KiB
C
434 lines
9.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* phonet.c -- USB CDC Phonet host driver
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*
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* Copyright (C) 2008-2009 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/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/gfp.h>
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#include <linux/usb.h>
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#include <linux/usb/cdc.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/if_phonet.h>
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#include <linux/phonet.h>
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#define PN_MEDIA_USB 0x1B
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static const unsigned rxq_size = 17;
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struct usbpn_dev {
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struct net_device *dev;
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struct usb_interface *intf, *data_intf;
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struct usb_device *usb;
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unsigned int tx_pipe, rx_pipe;
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u8 active_setting;
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u8 disconnected;
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unsigned tx_queue;
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spinlock_t tx_lock;
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spinlock_t rx_lock;
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struct sk_buff *rx_skb;
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struct urb *urbs[];
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};
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static void tx_complete(struct urb *req);
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static void rx_complete(struct urb *req);
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/*
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* Network device callbacks
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*/
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static netdev_tx_t usbpn_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct usbpn_dev *pnd = netdev_priv(dev);
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struct urb *req = NULL;
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unsigned long flags;
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int err;
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if (skb->protocol != htons(ETH_P_PHONET))
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goto drop;
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req = usb_alloc_urb(0, GFP_ATOMIC);
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if (!req)
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goto drop;
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usb_fill_bulk_urb(req, pnd->usb, pnd->tx_pipe, skb->data, skb->len,
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tx_complete, skb);
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req->transfer_flags = URB_ZERO_PACKET;
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err = usb_submit_urb(req, GFP_ATOMIC);
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if (err) {
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usb_free_urb(req);
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goto drop;
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}
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spin_lock_irqsave(&pnd->tx_lock, flags);
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pnd->tx_queue++;
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if (pnd->tx_queue >= dev->tx_queue_len)
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netif_stop_queue(dev);
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spin_unlock_irqrestore(&pnd->tx_lock, flags);
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return NETDEV_TX_OK;
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drop:
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dev_kfree_skb(skb);
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dev->stats.tx_dropped++;
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return NETDEV_TX_OK;
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}
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static void tx_complete(struct urb *req)
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{
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struct sk_buff *skb = req->context;
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struct net_device *dev = skb->dev;
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struct usbpn_dev *pnd = netdev_priv(dev);
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int status = req->status;
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unsigned long flags;
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switch (status) {
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case 0:
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dev->stats.tx_bytes += skb->len;
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break;
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case -ENOENT:
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case -ECONNRESET:
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case -ESHUTDOWN:
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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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dev_dbg(&dev->dev, "TX error (%d)\n", status);
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}
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dev->stats.tx_packets++;
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spin_lock_irqsave(&pnd->tx_lock, flags);
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pnd->tx_queue--;
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netif_wake_queue(dev);
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spin_unlock_irqrestore(&pnd->tx_lock, flags);
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dev_kfree_skb_any(skb);
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usb_free_urb(req);
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}
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static int rx_submit(struct usbpn_dev *pnd, struct urb *req, gfp_t gfp_flags)
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{
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struct net_device *dev = pnd->dev;
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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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usb_fill_bulk_urb(req, pnd->usb, pnd->rx_pipe, page_address(page),
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PAGE_SIZE, rx_complete, dev);
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req->transfer_flags = 0;
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err = usb_submit_urb(req, gfp_flags);
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if (unlikely(err)) {
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dev_dbg(&dev->dev, "RX submit error (%d)\n", err);
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put_page(page);
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}
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return err;
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}
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static void rx_complete(struct urb *req)
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{
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struct net_device *dev = req->context;
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struct usbpn_dev *pnd = netdev_priv(dev);
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struct page *page = virt_to_page(req->transfer_buffer);
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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(&pnd->rx_lock, flags);
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skb = pnd->rx_skb;
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if (!skb) {
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skb = pnd->rx_skb = netdev_alloc_skb(dev, 12);
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if (likely(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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skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
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page, 1, req->actual_length,
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PAGE_SIZE);
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page = NULL;
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}
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} else {
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skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
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page, 0, req->actual_length,
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PAGE_SIZE);
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page = NULL;
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}
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if (req->actual_length < PAGE_SIZE)
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pnd->rx_skb = NULL; /* Last fragment */
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else
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skb = NULL;
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spin_unlock_irqrestore(&pnd->rx_lock, flags);
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if (skb) {
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skb->protocol = htons(ETH_P_PHONET);
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skb_reset_mac_header(skb);
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__skb_pull(skb, 1);
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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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goto resubmit;
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case -ENOENT:
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case -ECONNRESET:
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case -ESHUTDOWN:
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req = NULL;
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break;
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case -EOVERFLOW:
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dev->stats.rx_over_errors++;
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dev_dbg(&dev->dev, "RX overflow\n");
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break;
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case -EILSEQ:
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dev->stats.rx_crc_errors++;
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break;
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}
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dev->stats.rx_errors++;
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resubmit:
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if (page)
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put_page(page);
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if (req)
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rx_submit(pnd, req, GFP_ATOMIC);
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}
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static int usbpn_close(struct net_device *dev);
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static int usbpn_open(struct net_device *dev)
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{
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struct usbpn_dev *pnd = netdev_priv(dev);
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int err;
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unsigned i;
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unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
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err = usb_set_interface(pnd->usb, num, pnd->active_setting);
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if (err)
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return err;
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for (i = 0; i < rxq_size; i++) {
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struct urb *req = usb_alloc_urb(0, GFP_KERNEL);
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if (!req || rx_submit(pnd, req, GFP_KERNEL)) {
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usb_free_urb(req);
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usbpn_close(dev);
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return -ENOMEM;
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}
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pnd->urbs[i] = req;
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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 usbpn_close(struct net_device *dev)
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{
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struct usbpn_dev *pnd = netdev_priv(dev);
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unsigned i;
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unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
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netif_stop_queue(dev);
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for (i = 0; i < rxq_size; i++) {
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struct urb *req = pnd->urbs[i];
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if (!req)
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continue;
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usb_kill_urb(req);
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usb_free_urb(req);
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pnd->urbs[i] = NULL;
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}
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return usb_set_interface(pnd->usb, num, !pnd->active_setting);
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}
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static int usbpn_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
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void __user *data, int cmd)
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{
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struct if_phonet_req *req = (struct if_phonet_req *)ifr;
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switch (cmd) {
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case SIOCPNGAUTOCONF:
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req->ifr_phonet_autoconf.device = PN_DEV_PC;
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return 0;
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}
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return -ENOIOCTLCMD;
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}
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static const struct net_device_ops usbpn_ops = {
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.ndo_open = usbpn_open,
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.ndo_stop = usbpn_close,
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.ndo_start_xmit = usbpn_xmit,
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.ndo_siocdevprivate = usbpn_siocdevprivate,
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};
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static void usbpn_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->netdev_ops = &usbpn_ops;
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dev->header_ops = &phonet_header_ops;
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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_MAX_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 = 3;
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dev->needs_free_netdev = true;
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}
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/*
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* USB driver callbacks
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*/
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static const struct usb_device_id usbpn_ids[] = {
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{
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.match_flags = USB_DEVICE_ID_MATCH_VENDOR
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| USB_DEVICE_ID_MATCH_INT_CLASS
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| USB_DEVICE_ID_MATCH_INT_SUBCLASS,
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.idVendor = 0x0421, /* Nokia */
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.bInterfaceClass = USB_CLASS_COMM,
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.bInterfaceSubClass = 0xFE,
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},
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{ },
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};
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MODULE_DEVICE_TABLE(usb, usbpn_ids);
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static struct usb_driver usbpn_driver;
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static int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
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{
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static const char ifname[] = "usbpn%d";
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const struct usb_cdc_union_desc *union_header = NULL;
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const struct usb_host_interface *data_desc;
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struct usb_interface *data_intf;
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struct usb_device *usbdev = interface_to_usbdev(intf);
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struct net_device *dev;
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struct usbpn_dev *pnd;
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u8 *data;
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int phonet = 0;
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int len, err;
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struct usb_cdc_parsed_header hdr;
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data = intf->altsetting->extra;
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len = intf->altsetting->extralen;
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cdc_parse_cdc_header(&hdr, intf, data, len);
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union_header = hdr.usb_cdc_union_desc;
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phonet = hdr.phonet_magic_present;
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if (!union_header || !phonet)
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return -EINVAL;
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data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0);
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if (data_intf == NULL)
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return -ENODEV;
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/* Data interface has one inactive and one active setting */
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if (data_intf->num_altsetting != 2)
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return -EINVAL;
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if (data_intf->altsetting[0].desc.bNumEndpoints == 0 &&
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data_intf->altsetting[1].desc.bNumEndpoints == 2)
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data_desc = data_intf->altsetting + 1;
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else
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if (data_intf->altsetting[0].desc.bNumEndpoints == 2 &&
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data_intf->altsetting[1].desc.bNumEndpoints == 0)
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data_desc = data_intf->altsetting;
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else
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return -EINVAL;
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dev = alloc_netdev(struct_size(pnd, urbs, rxq_size), ifname,
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NET_NAME_UNKNOWN, usbpn_setup);
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if (!dev)
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return -ENOMEM;
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pnd = netdev_priv(dev);
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SET_NETDEV_DEV(dev, &intf->dev);
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pnd->dev = dev;
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pnd->usb = usbdev;
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pnd->intf = intf;
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pnd->data_intf = data_intf;
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spin_lock_init(&pnd->tx_lock);
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spin_lock_init(&pnd->rx_lock);
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/* Endpoints */
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if (usb_pipein(data_desc->endpoint[0].desc.bEndpointAddress)) {
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pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
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data_desc->endpoint[0].desc.bEndpointAddress);
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pnd->tx_pipe = usb_sndbulkpipe(usbdev,
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data_desc->endpoint[1].desc.bEndpointAddress);
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} else {
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pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
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data_desc->endpoint[1].desc.bEndpointAddress);
|
||
|
|
pnd->tx_pipe = usb_sndbulkpipe(usbdev,
|
||
|
|
data_desc->endpoint[0].desc.bEndpointAddress);
|
||
|
|
}
|
||
|
|
pnd->active_setting = data_desc - data_intf->altsetting;
|
||
|
|
|
||
|
|
err = usb_driver_claim_interface(&usbpn_driver, data_intf, pnd);
|
||
|
|
if (err)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
/* Force inactive mode until the network device is brought UP */
|
||
|
|
usb_set_interface(usbdev, union_header->bSlaveInterface0,
|
||
|
|
!pnd->active_setting);
|
||
|
|
usb_set_intfdata(intf, pnd);
|
||
|
|
|
||
|
|
err = register_netdev(dev);
|
||
|
|
if (err) {
|
||
|
|
/* Set disconnected flag so that disconnect() returns early. */
|
||
|
|
pnd->disconnected = 1;
|
||
|
|
usb_driver_release_interface(&usbpn_driver, data_intf);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
dev_dbg(&dev->dev, "USB CDC Phonet device found\n");
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
out:
|
||
|
|
usb_set_intfdata(intf, NULL);
|
||
|
|
free_netdev(dev);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void usbpn_disconnect(struct usb_interface *intf)
|
||
|
|
{
|
||
|
|
struct usbpn_dev *pnd = usb_get_intfdata(intf);
|
||
|
|
|
||
|
|
if (pnd->disconnected)
|
||
|
|
return;
|
||
|
|
|
||
|
|
pnd->disconnected = 1;
|
||
|
|
usb_driver_release_interface(&usbpn_driver,
|
||
|
|
(pnd->intf == intf) ? pnd->data_intf : pnd->intf);
|
||
|
|
unregister_netdev(pnd->dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct usb_driver usbpn_driver = {
|
||
|
|
.name = "cdc_phonet",
|
||
|
|
.probe = usbpn_probe,
|
||
|
|
.disconnect = usbpn_disconnect,
|
||
|
|
.id_table = usbpn_ids,
|
||
|
|
.disable_hub_initiated_lpm = 1,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_usb_driver(usbpn_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Remi Denis-Courmont");
|
||
|
|
MODULE_DESCRIPTION("USB CDC Phonet host interface");
|
||
|
|
MODULE_LICENSE("GPL");
|