| /* |
| * phonet.c -- USB CDC Phonet host driver |
| * |
| * Copyright (C) 2008-2009 Nokia Corporation. All rights reserved. |
| * |
| * Author: Rémi Denis-Courmont |
| * |
| * 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 |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/module.h> |
| #include <linux/gfp.h> |
| #include <linux/usb.h> |
| #include <linux/usb/cdc.h> |
| #include <linux/netdevice.h> |
| #include <linux/if_arp.h> |
| #include <linux/if_phonet.h> |
| #include <linux/phonet.h> |
| |
| #define PN_MEDIA_USB 0x1B |
| |
| static const unsigned rxq_size = 17; |
| |
| struct usbpn_dev { |
| struct net_device *dev; |
| |
| struct usb_interface *intf, *data_intf; |
| struct usb_device *usb; |
| unsigned int tx_pipe, rx_pipe; |
| u8 active_setting; |
| u8 disconnected; |
| |
| unsigned tx_queue; |
| spinlock_t tx_lock; |
| |
| spinlock_t rx_lock; |
| struct sk_buff *rx_skb; |
| struct urb *urbs[0]; |
| }; |
| |
| static void tx_complete(struct urb *req); |
| static void rx_complete(struct urb *req); |
| |
| /* |
| * Network device callbacks |
| */ |
| static netdev_tx_t usbpn_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct usbpn_dev *pnd = netdev_priv(dev); |
| struct urb *req = NULL; |
| unsigned long flags; |
| int err; |
| |
| if (skb->protocol != htons(ETH_P_PHONET)) |
| goto drop; |
| |
| req = usb_alloc_urb(0, GFP_ATOMIC); |
| if (!req) |
| goto drop; |
| usb_fill_bulk_urb(req, pnd->usb, pnd->tx_pipe, skb->data, skb->len, |
| tx_complete, skb); |
| req->transfer_flags = URB_ZERO_PACKET; |
| err = usb_submit_urb(req, GFP_ATOMIC); |
| if (err) { |
| usb_free_urb(req); |
| goto drop; |
| } |
| |
| spin_lock_irqsave(&pnd->tx_lock, flags); |
| pnd->tx_queue++; |
| if (pnd->tx_queue >= dev->tx_queue_len) |
| netif_stop_queue(dev); |
| spin_unlock_irqrestore(&pnd->tx_lock, flags); |
| return NETDEV_TX_OK; |
| |
| drop: |
| dev_kfree_skb(skb); |
| dev->stats.tx_dropped++; |
| return NETDEV_TX_OK; |
| } |
| |
| static void tx_complete(struct urb *req) |
| { |
| struct sk_buff *skb = req->context; |
| struct net_device *dev = skb->dev; |
| struct usbpn_dev *pnd = netdev_priv(dev); |
| int status = req->status; |
| |
| switch (status) { |
| case 0: |
| dev->stats.tx_bytes += skb->len; |
| break; |
| |
| case -ENOENT: |
| case -ECONNRESET: |
| case -ESHUTDOWN: |
| dev->stats.tx_aborted_errors++; |
| default: |
| dev->stats.tx_errors++; |
| dev_dbg(&dev->dev, "TX error (%d)\n", status); |
| } |
| dev->stats.tx_packets++; |
| |
| spin_lock(&pnd->tx_lock); |
| pnd->tx_queue--; |
| netif_wake_queue(dev); |
| spin_unlock(&pnd->tx_lock); |
| |
| dev_kfree_skb_any(skb); |
| usb_free_urb(req); |
| } |
| |
| static int rx_submit(struct usbpn_dev *pnd, struct urb *req, gfp_t gfp_flags) |
| { |
| struct net_device *dev = pnd->dev; |
| struct page *page; |
| int err; |
| |
| page = __skb_alloc_page(gfp_flags | __GFP_NOMEMALLOC, NULL); |
| if (!page) |
| return -ENOMEM; |
| |
| usb_fill_bulk_urb(req, pnd->usb, pnd->rx_pipe, page_address(page), |
| PAGE_SIZE, rx_complete, dev); |
| req->transfer_flags = 0; |
| err = usb_submit_urb(req, gfp_flags); |
| if (unlikely(err)) { |
| dev_dbg(&dev->dev, "RX submit error (%d)\n", err); |
| put_page(page); |
| } |
| return err; |
| } |
| |
| static void rx_complete(struct urb *req) |
| { |
| struct net_device *dev = req->context; |
| struct usbpn_dev *pnd = netdev_priv(dev); |
| struct page *page = virt_to_page(req->transfer_buffer); |
| struct sk_buff *skb; |
| unsigned long flags; |
| int status = req->status; |
| |
| switch (status) { |
| case 0: |
| spin_lock_irqsave(&pnd->rx_lock, flags); |
| skb = pnd->rx_skb; |
| if (!skb) { |
| skb = pnd->rx_skb = netdev_alloc_skb(dev, 12); |
| if (likely(skb)) { |
| /* Can't use pskb_pull() on page in IRQ */ |
| memcpy(skb_put(skb, 1), page_address(page), 1); |
| skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, |
| page, 1, req->actual_length, |
| PAGE_SIZE); |
| page = NULL; |
| } |
| } else { |
| skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, |
| page, 0, req->actual_length, |
| PAGE_SIZE); |
| page = NULL; |
| } |
| if (req->actual_length < PAGE_SIZE) |
| pnd->rx_skb = NULL; /* Last fragment */ |
| else |
| skb = NULL; |
| spin_unlock_irqrestore(&pnd->rx_lock, flags); |
| if (skb) { |
| skb->protocol = htons(ETH_P_PHONET); |
| skb_reset_mac_header(skb); |
| __skb_pull(skb, 1); |
| skb->dev = dev; |
| dev->stats.rx_packets++; |
| dev->stats.rx_bytes += skb->len; |
| |
| netif_rx(skb); |
| } |
| goto resubmit; |
| |
| case -ENOENT: |
| case -ECONNRESET: |
| case -ESHUTDOWN: |
| req = NULL; |
| break; |
| |
| case -EOVERFLOW: |
| dev->stats.rx_over_errors++; |
| dev_dbg(&dev->dev, "RX overflow\n"); |
| break; |
| |
| case -EILSEQ: |
| dev->stats.rx_crc_errors++; |
| break; |
| } |
| |
| dev->stats.rx_errors++; |
| resubmit: |
| if (page) |
| put_page(page); |
| if (req) |
| rx_submit(pnd, req, GFP_ATOMIC | __GFP_COLD); |
| } |
| |
| static int usbpn_close(struct net_device *dev); |
| |
| static int usbpn_open(struct net_device *dev) |
| { |
| struct usbpn_dev *pnd = netdev_priv(dev); |
| int err; |
| unsigned i; |
| unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber; |
| |
| err = usb_set_interface(pnd->usb, num, pnd->active_setting); |
| if (err) |
| return err; |
| |
| for (i = 0; i < rxq_size; i++) { |
| struct urb *req = usb_alloc_urb(0, GFP_KERNEL); |
| |
| if (!req || rx_submit(pnd, req, GFP_KERNEL | __GFP_COLD)) { |
| usbpn_close(dev); |
| return -ENOMEM; |
| } |
| pnd->urbs[i] = req; |
| } |
| |
| netif_wake_queue(dev); |
| return 0; |
| } |
| |
| static int usbpn_close(struct net_device *dev) |
| { |
| struct usbpn_dev *pnd = netdev_priv(dev); |
| unsigned i; |
| unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber; |
| |
| netif_stop_queue(dev); |
| |
| for (i = 0; i < rxq_size; i++) { |
| struct urb *req = pnd->urbs[i]; |
| |
| if (!req) |
| continue; |
| usb_kill_urb(req); |
| usb_free_urb(req); |
| pnd->urbs[i] = NULL; |
| } |
| |
| return usb_set_interface(pnd->usb, num, !pnd->active_setting); |
| } |
| |
| static int usbpn_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
| { |
| struct if_phonet_req *req = (struct if_phonet_req *)ifr; |
| |
| switch (cmd) { |
| case SIOCPNGAUTOCONF: |
| req->ifr_phonet_autoconf.device = PN_DEV_PC; |
| return 0; |
| } |
| return -ENOIOCTLCMD; |
| } |
| |
| static int usbpn_set_mtu(struct net_device *dev, int new_mtu) |
| { |
| if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU)) |
| return -EINVAL; |
| |
| dev->mtu = new_mtu; |
| return 0; |
| } |
| |
| static const struct net_device_ops usbpn_ops = { |
| .ndo_open = usbpn_open, |
| .ndo_stop = usbpn_close, |
| .ndo_start_xmit = usbpn_xmit, |
| .ndo_do_ioctl = usbpn_ioctl, |
| .ndo_change_mtu = usbpn_set_mtu, |
| }; |
| |
| static void usbpn_setup(struct net_device *dev) |
| { |
| dev->features = 0; |
| dev->netdev_ops = &usbpn_ops, |
| dev->header_ops = &phonet_header_ops; |
| dev->type = ARPHRD_PHONET; |
| dev->flags = IFF_POINTOPOINT | IFF_NOARP; |
| dev->mtu = PHONET_MAX_MTU; |
| dev->hard_header_len = 1; |
| dev->dev_addr[0] = PN_MEDIA_USB; |
| dev->addr_len = 1; |
| dev->tx_queue_len = 3; |
| |
| dev->destructor = free_netdev; |
| } |
| |
| /* |
| * USB driver callbacks |
| */ |
| static struct usb_device_id usbpn_ids[] = { |
| { |
| .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
| | USB_DEVICE_ID_MATCH_INT_CLASS |
| | USB_DEVICE_ID_MATCH_INT_SUBCLASS, |
| .idVendor = 0x0421, /* Nokia */ |
| .bInterfaceClass = USB_CLASS_COMM, |
| .bInterfaceSubClass = 0xFE, |
| }, |
| { }, |
| }; |
| |
| MODULE_DEVICE_TABLE(usb, usbpn_ids); |
| |
| static struct usb_driver usbpn_driver; |
| |
| int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id) |
| { |
| static const char ifname[] = "usbpn%d"; |
| const struct usb_cdc_union_desc *union_header = NULL; |
| const struct usb_host_interface *data_desc; |
| struct usb_interface *data_intf; |
| struct usb_device *usbdev = interface_to_usbdev(intf); |
| struct net_device *dev; |
| struct usbpn_dev *pnd; |
| u8 *data; |
| int phonet = 0; |
| int len, err; |
| |
| data = intf->altsetting->extra; |
| len = intf->altsetting->extralen; |
| while (len >= 3) { |
| u8 dlen = data[0]; |
| if (dlen < 3) |
| return -EINVAL; |
| |
| /* bDescriptorType */ |
| if (data[1] == USB_DT_CS_INTERFACE) { |
| /* bDescriptorSubType */ |
| switch (data[2]) { |
| case USB_CDC_UNION_TYPE: |
| if (union_header || dlen < 5) |
| break; |
| union_header = |
| (struct usb_cdc_union_desc *)data; |
| break; |
| case 0xAB: |
| phonet = 1; |
| break; |
| } |
| } |
| data += dlen; |
| len -= dlen; |
| } |
| |
| if (!union_header || !phonet) |
| return -EINVAL; |
| |
| data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0); |
| if (data_intf == NULL) |
| return -ENODEV; |
| /* Data interface has one inactive and one active setting */ |
| if (data_intf->num_altsetting != 2) |
| return -EINVAL; |
| if (data_intf->altsetting[0].desc.bNumEndpoints == 0 && |
| data_intf->altsetting[1].desc.bNumEndpoints == 2) |
| data_desc = data_intf->altsetting + 1; |
| else |
| if (data_intf->altsetting[0].desc.bNumEndpoints == 2 && |
| data_intf->altsetting[1].desc.bNumEndpoints == 0) |
| data_desc = data_intf->altsetting; |
| else |
| return -EINVAL; |
| |
| dev = alloc_netdev(sizeof(*pnd) + sizeof(pnd->urbs[0]) * rxq_size, |
| ifname, usbpn_setup); |
| if (!dev) |
| return -ENOMEM; |
| |
| pnd = netdev_priv(dev); |
| SET_NETDEV_DEV(dev, &intf->dev); |
| |
| pnd->dev = dev; |
| pnd->usb = usbdev; |
| pnd->intf = intf; |
| pnd->data_intf = data_intf; |
| spin_lock_init(&pnd->tx_lock); |
| spin_lock_init(&pnd->rx_lock); |
| /* Endpoints */ |
| if (usb_pipein(data_desc->endpoint[0].desc.bEndpointAddress)) { |
| pnd->rx_pipe = usb_rcvbulkpipe(usbdev, |
| data_desc->endpoint[0].desc.bEndpointAddress); |
| pnd->tx_pipe = usb_sndbulkpipe(usbdev, |
| data_desc->endpoint[1].desc.bEndpointAddress); |
| } else { |
| pnd->rx_pipe = usb_rcvbulkpipe(usbdev, |
| 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) { |
| 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"); |