diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/net/usb/lg-vl600.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/net/usb/lg-vl600.c | 353 |
1 files changed, 0 insertions, 353 deletions
diff --git a/ANDROID_3.4.5/drivers/net/usb/lg-vl600.c b/ANDROID_3.4.5/drivers/net/usb/lg-vl600.c deleted file mode 100644 index 45a981fd..00000000 --- a/ANDROID_3.4.5/drivers/net/usb/lg-vl600.c +++ /dev/null @@ -1,353 +0,0 @@ -/* - * Ethernet interface part of the LG VL600 LTE modem (4G dongle) - * - * Copyright (C) 2011 Intel Corporation - * Author: Andrzej Zaborowski <balrogg@gmail.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ -#include <linux/etherdevice.h> -#include <linux/ethtool.h> -#include <linux/mii.h> -#include <linux/usb.h> -#include <linux/usb/cdc.h> -#include <linux/usb/usbnet.h> -#include <linux/if_ether.h> -#include <linux/if_arp.h> -#include <linux/inetdevice.h> -#include <linux/module.h> - -/* - * The device has a CDC ACM port for modem control (it claims to be - * CDC ACM anyway) and a CDC Ethernet port for actual network data. - * It will however ignore data on both ports that is not encapsulated - * in a specific way, any data returned is also encapsulated the same - * way. The headers don't seem to follow any popular standard. - * - * This driver adds and strips these headers from the ethernet frames - * sent/received from the CDC Ethernet port. The proprietary header - * replaces the standard ethernet header in a packet so only actual - * ethernet frames are allowed. The headers allow some form of - * multiplexing by using non standard values of the .h_proto field. - * Windows/Mac drivers do send a couple of such frames to the device - * during initialisation, with protocol set to 0x0906 or 0x0b06 and (what - * seems to be) a flag in the .dummy_flags. This doesn't seem necessary - * for modem operation but can possibly be used for GPS or other funcitons. - */ - -struct vl600_frame_hdr { - __le32 len; - __le32 serial; - __le32 pkt_cnt; - __le32 dummy_flags; - __le32 dummy; - __le32 magic; -} __attribute__((packed)); - -struct vl600_pkt_hdr { - __le32 dummy[2]; - __le32 len; - __be16 h_proto; -} __attribute__((packed)); - -struct vl600_state { - struct sk_buff *current_rx_buf; -}; - -static int vl600_bind(struct usbnet *dev, struct usb_interface *intf) -{ - int ret; - struct vl600_state *s = kzalloc(sizeof(struct vl600_state), GFP_KERNEL); - - if (!s) - return -ENOMEM; - - ret = usbnet_cdc_bind(dev, intf); - if (ret) { - kfree(s); - return ret; - } - - dev->driver_priv = s; - - /* ARP packets don't go through, but they're also of no use. The - * subnet has only two hosts anyway: us and the gateway / DHCP - * server (probably simulated by modem firmware or network operator) - * whose address changes everytime we connect to the intarwebz and - * who doesn't bother answering ARP requests either. So hardware - * addresses have no meaning, the destination and the source of every - * packet depend only on whether it is on the IN or OUT endpoint. */ - dev->net->flags |= IFF_NOARP; - /* IPv6 NDP relies on multicast. Enable it by default. */ - dev->net->flags |= IFF_MULTICAST; - - return ret; -} - -static void vl600_unbind(struct usbnet *dev, struct usb_interface *intf) -{ - struct vl600_state *s = dev->driver_priv; - - if (s->current_rx_buf) - dev_kfree_skb(s->current_rx_buf); - - kfree(s); - - return usbnet_cdc_unbind(dev, intf); -} - -static int vl600_rx_fixup(struct usbnet *dev, struct sk_buff *skb) -{ - struct vl600_frame_hdr *frame; - struct vl600_pkt_hdr *packet; - struct ethhdr *ethhdr; - int packet_len, count; - struct sk_buff *buf = skb; - struct sk_buff *clone; - struct vl600_state *s = dev->driver_priv; - - /* Frame lengths are generally 4B multiplies but every couple of - * hours there's an odd number of bytes sized yet correct frame, - * so don't require this. */ - - /* Allow a packet (or multiple packets batched together) to be - * split across many frames. We don't allow a new batch to - * begin in the same frame another one is ending however, and no - * leading or trailing pad bytes. */ - if (s->current_rx_buf) { - frame = (struct vl600_frame_hdr *) s->current_rx_buf->data; - if (skb->len + s->current_rx_buf->len > - le32_to_cpup(&frame->len)) { - netif_err(dev, ifup, dev->net, "Fragment too long\n"); - dev->net->stats.rx_length_errors++; - goto error; - } - - buf = s->current_rx_buf; - memcpy(skb_put(buf, skb->len), skb->data, skb->len); - } else if (skb->len < 4) { - netif_err(dev, ifup, dev->net, "Frame too short\n"); - dev->net->stats.rx_length_errors++; - goto error; - } - - frame = (struct vl600_frame_hdr *) buf->data; - /* Yes, check that frame->magic == 0x53544448 (or 0x44544d48), - * otherwise we may run out of memory w/a bad packet */ - if (ntohl(frame->magic) != 0x53544448 && - ntohl(frame->magic) != 0x44544d48) - goto error; - - if (buf->len < sizeof(*frame) || - buf->len != le32_to_cpup(&frame->len)) { - /* Save this fragment for later assembly */ - if (s->current_rx_buf) - return 0; - - s->current_rx_buf = skb_copy_expand(skb, 0, - le32_to_cpup(&frame->len), GFP_ATOMIC); - if (!s->current_rx_buf) { - netif_err(dev, ifup, dev->net, "Reserving %i bytes " - "for packet assembly failed.\n", - le32_to_cpup(&frame->len)); - dev->net->stats.rx_errors++; - } - - return 0; - } - - count = le32_to_cpup(&frame->pkt_cnt); - - skb_pull(buf, sizeof(*frame)); - - while (count--) { - if (buf->len < sizeof(*packet)) { - netif_err(dev, ifup, dev->net, "Packet too short\n"); - goto error; - } - - packet = (struct vl600_pkt_hdr *) buf->data; - packet_len = sizeof(*packet) + le32_to_cpup(&packet->len); - if (packet_len > buf->len) { - netif_err(dev, ifup, dev->net, - "Bad packet length stored in header\n"); - goto error; - } - - /* Packet header is same size as the ethernet header - * (sizeof(*packet) == sizeof(*ethhdr)), additionally - * the h_proto field is in the same place so we just leave it - * alone and fill in the remaining fields. - */ - ethhdr = (struct ethhdr *) skb->data; - if (be16_to_cpup(ðhdr->h_proto) == ETH_P_ARP && - buf->len > 0x26) { - /* Copy the addresses from packet contents */ - memcpy(ethhdr->h_source, - &buf->data[sizeof(*ethhdr) + 0x8], - ETH_ALEN); - memcpy(ethhdr->h_dest, - &buf->data[sizeof(*ethhdr) + 0x12], - ETH_ALEN); - } else { - memset(ethhdr->h_source, 0, ETH_ALEN); - memcpy(ethhdr->h_dest, dev->net->dev_addr, ETH_ALEN); - - /* Inbound IPv6 packets have an IPv4 ethertype (0x800) - * for some reason. Peek at the L3 header to check - * for IPv6 packets, and set the ethertype to IPv6 - * (0x86dd) so Linux can understand it. - */ - if ((buf->data[sizeof(*ethhdr)] & 0xf0) == 0x60) - ethhdr->h_proto = __constant_htons(ETH_P_IPV6); - } - - if (count) { - /* Not the last packet in this batch */ - clone = skb_clone(buf, GFP_ATOMIC); - if (!clone) - goto error; - - skb_trim(clone, packet_len); - usbnet_skb_return(dev, clone); - - skb_pull(buf, (packet_len + 3) & ~3); - } else { - skb_trim(buf, packet_len); - - if (s->current_rx_buf) { - usbnet_skb_return(dev, buf); - s->current_rx_buf = NULL; - return 0; - } - - return 1; - } - } - -error: - if (s->current_rx_buf) { - dev_kfree_skb_any(s->current_rx_buf); - s->current_rx_buf = NULL; - } - dev->net->stats.rx_errors++; - return 0; -} - -static struct sk_buff *vl600_tx_fixup(struct usbnet *dev, - struct sk_buff *skb, gfp_t flags) -{ - struct sk_buff *ret; - struct vl600_frame_hdr *frame; - struct vl600_pkt_hdr *packet; - static uint32_t serial = 1; - int orig_len = skb->len - sizeof(struct ethhdr); - int full_len = (skb->len + sizeof(struct vl600_frame_hdr) + 3) & ~3; - - frame = (struct vl600_frame_hdr *) skb->data; - if (skb->len > sizeof(*frame) && skb->len == le32_to_cpup(&frame->len)) - return skb; /* Already encapsulated? */ - - if (skb->len < sizeof(struct ethhdr)) - /* Drop, device can only deal with ethernet packets */ - return NULL; - - if (!skb_cloned(skb)) { - int headroom = skb_headroom(skb); - int tailroom = skb_tailroom(skb); - - if (tailroom >= full_len - skb->len - sizeof(*frame) && - headroom >= sizeof(*frame)) - /* There's enough head and tail room */ - goto encapsulate; - - if (headroom + tailroom + skb->len >= full_len) { - /* There's enough total room, just readjust */ - skb->data = memmove(skb->head + sizeof(*frame), - skb->data, skb->len); - skb_set_tail_pointer(skb, skb->len); - goto encapsulate; - } - } - - /* Alloc a new skb with the required size */ - ret = skb_copy_expand(skb, sizeof(struct vl600_frame_hdr), full_len - - skb->len - sizeof(struct vl600_frame_hdr), flags); - dev_kfree_skb_any(skb); - if (!ret) - return ret; - skb = ret; - -encapsulate: - /* Packet header is same size as ethernet packet header - * (sizeof(*packet) == sizeof(struct ethhdr)), additionally the - * h_proto field is in the same place so we just leave it alone and - * overwrite the remaining fields. - */ - packet = (struct vl600_pkt_hdr *) skb->data; - /* The VL600 wants IPv6 packets to have an IPv4 ethertype - * Since this modem only supports IPv4 and IPv6, just set all - * frames to 0x0800 (ETH_P_IP) - */ - packet->h_proto = htons(ETH_P_IP); - memset(&packet->dummy, 0, sizeof(packet->dummy)); - packet->len = cpu_to_le32(orig_len); - - frame = (struct vl600_frame_hdr *) skb_push(skb, sizeof(*frame)); - memset(frame, 0, sizeof(*frame)); - frame->len = cpu_to_le32(full_len); - frame->serial = cpu_to_le32(serial++); - frame->pkt_cnt = cpu_to_le32(1); - - if (skb->len < full_len) /* Pad */ - skb_put(skb, full_len - skb->len); - - return skb; -} - -static const struct driver_info vl600_info = { - .description = "LG VL600 modem", - .flags = FLAG_RX_ASSEMBLE | FLAG_WWAN, - .bind = vl600_bind, - .unbind = vl600_unbind, - .status = usbnet_cdc_status, - .rx_fixup = vl600_rx_fixup, - .tx_fixup = vl600_tx_fixup, -}; - -static const struct usb_device_id products[] = { - { - USB_DEVICE_AND_INTERFACE_INFO(0x1004, 0x61aa, USB_CLASS_COMM, - USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE), - .driver_info = (unsigned long) &vl600_info, - }, - {}, /* End */ -}; -MODULE_DEVICE_TABLE(usb, products); - -static struct usb_driver lg_vl600_driver = { - .name = "lg-vl600", - .id_table = products, - .probe = usbnet_probe, - .disconnect = usbnet_disconnect, - .suspend = usbnet_suspend, - .resume = usbnet_resume, -}; - -module_usb_driver(lg_vl600_driver); - -MODULE_AUTHOR("Anrzej Zaborowski"); -MODULE_DESCRIPTION("LG-VL600 modem's ethernet link"); -MODULE_LICENSE("GPL"); |