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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 246 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.674189849@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
428 lines
9.8 KiB
C
428 lines
9.8 KiB
C
// 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[0];
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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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/* fall through */
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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_ioctl(struct net_device *dev, struct ifreq *ifr, 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_do_ioctl = usbpn_ioctl,
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};
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static void usbpn_setup(struct net_device *dev)
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{
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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->dev_addr[0] = PN_MEDIA_USB;
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dev->addr_len = 1;
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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);
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pnd->tx_pipe = usb_sndbulkpipe(usbdev,
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data_desc->endpoint[0].desc.bEndpointAddress);
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}
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pnd->active_setting = data_desc - data_intf->altsetting;
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err = usb_driver_claim_interface(&usbpn_driver, data_intf, pnd);
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if (err)
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goto out;
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/* Force inactive mode until the network device is brought UP */
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usb_set_interface(usbdev, union_header->bSlaveInterface0,
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!pnd->active_setting);
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usb_set_intfdata(intf, pnd);
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err = register_netdev(dev);
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if (err) {
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usb_driver_release_interface(&usbpn_driver, data_intf);
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goto out;
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}
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dev_dbg(&dev->dev, "USB CDC Phonet device found\n");
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return 0;
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out:
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usb_set_intfdata(intf, NULL);
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free_netdev(dev);
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return err;
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}
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static void usbpn_disconnect(struct usb_interface *intf)
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{
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struct usbpn_dev *pnd = usb_get_intfdata(intf);
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if (pnd->disconnected)
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return;
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pnd->disconnected = 1;
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usb_driver_release_interface(&usbpn_driver,
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(pnd->intf == intf) ? pnd->data_intf : pnd->intf);
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unregister_netdev(pnd->dev);
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}
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static struct usb_driver usbpn_driver = {
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.name = "cdc_phonet",
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.probe = usbpn_probe,
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.disconnect = usbpn_disconnect,
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.id_table = usbpn_ids,
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.disable_hub_initiated_lpm = 1,
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};
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module_usb_driver(usbpn_driver);
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MODULE_AUTHOR("Remi Denis-Courmont");
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MODULE_DESCRIPTION("USB CDC Phonet host interface");
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MODULE_LICENSE("GPL");
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