diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/net/usb/cdc_eem.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/net/usb/cdc_eem.c | 377 |
1 files changed, 0 insertions, 377 deletions
diff --git a/ANDROID_3.4.5/drivers/net/usb/cdc_eem.c b/ANDROID_3.4.5/drivers/net/usb/cdc_eem.c deleted file mode 100644 index 685a4e22..00000000 --- a/ANDROID_3.4.5/drivers/net/usb/cdc_eem.c +++ /dev/null @@ -1,377 +0,0 @@ -/* - * USB CDC EEM network interface driver - * Copyright (C) 2009 Oberthur Technologies - * by Omar Laazimani, Olivier Condemine - * - * 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/module.h> -#include <linux/init.h> -#include <linux/netdevice.h> -#include <linux/etherdevice.h> -#include <linux/ctype.h> -#include <linux/ethtool.h> -#include <linux/workqueue.h> -#include <linux/mii.h> -#include <linux/usb.h> -#include <linux/crc32.h> -#include <linux/usb/cdc.h> -#include <linux/usb/usbnet.h> -#include <linux/gfp.h> - - -/* - * This driver is an implementation of the CDC "Ethernet Emulation - * Model" (EEM) specification, which encapsulates Ethernet frames - * for transport over USB using a simpler USB device model than the - * previous CDC "Ethernet Control Model" (ECM, or "CDC Ethernet"). - * - * For details, see www.usb.org/developers/devclass_docs/CDC_EEM10.pdf - * - * This version has been tested with GIGAntIC WuaoW SIM Smart Card on 2.6.24, - * 2.6.27 and 2.6.30rc2 kernel. - * It has also been validated on Openmoko Om 2008.12 (based on 2.6.24 kernel). - * build on 23-April-2009 - */ - -#define EEM_HEAD 2 /* 2 byte header */ - -/*-------------------------------------------------------------------------*/ - -static void eem_linkcmd_complete(struct urb *urb) -{ - dev_kfree_skb(urb->context); - usb_free_urb(urb); -} - -static void eem_linkcmd(struct usbnet *dev, struct sk_buff *skb) -{ - struct urb *urb; - int status; - - urb = usb_alloc_urb(0, GFP_ATOMIC); - if (!urb) - goto fail; - - usb_fill_bulk_urb(urb, dev->udev, dev->out, - skb->data, skb->len, eem_linkcmd_complete, skb); - - status = usb_submit_urb(urb, GFP_ATOMIC); - if (status) { - usb_free_urb(urb); -fail: - dev_kfree_skb(skb); - netdev_warn(dev->net, "link cmd failure\n"); - return; - } -} - -static int eem_bind(struct usbnet *dev, struct usb_interface *intf) -{ - int status = 0; - - status = usbnet_get_endpoints(dev, intf); - if (status < 0) { - usb_set_intfdata(intf, NULL); - usb_driver_release_interface(driver_of(intf), intf); - return status; - } - - /* no jumbogram (16K) support for now */ - - dev->net->hard_header_len += EEM_HEAD + ETH_FCS_LEN; - dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len; - - return 0; -} - -/* - * EEM permits packing multiple Ethernet frames into USB transfers - * (a "bundle"), but for TX we don't try to do that. - */ -static struct sk_buff *eem_tx_fixup(struct usbnet *dev, struct sk_buff *skb, - gfp_t flags) -{ - struct sk_buff *skb2 = NULL; - u16 len = skb->len; - u32 crc = 0; - int padlen = 0; - - /* When ((len + EEM_HEAD + ETH_FCS_LEN) % dev->maxpacket) is - * zero, stick two bytes of zero length EEM packet on the end. - * Else the framework would add invalid single byte padding, - * since it can't know whether ZLPs will be handled right by - * all the relevant hardware and software. - */ - if (!((len + EEM_HEAD + ETH_FCS_LEN) % dev->maxpacket)) - padlen += 2; - - if (!skb_cloned(skb)) { - int headroom = skb_headroom(skb); - int tailroom = skb_tailroom(skb); - - if ((tailroom >= ETH_FCS_LEN + padlen) && - (headroom >= EEM_HEAD)) - goto done; - - if ((headroom + tailroom) - > (EEM_HEAD + ETH_FCS_LEN + padlen)) { - skb->data = memmove(skb->head + - EEM_HEAD, - skb->data, - skb->len); - skb_set_tail_pointer(skb, len); - goto done; - } - } - - skb2 = skb_copy_expand(skb, EEM_HEAD, ETH_FCS_LEN + padlen, flags); - if (!skb2) - return NULL; - - dev_kfree_skb_any(skb); - skb = skb2; - -done: - /* we don't use the "no Ethernet CRC" option */ - crc = crc32_le(~0, skb->data, skb->len); - crc = ~crc; - - put_unaligned_le32(crc, skb_put(skb, 4)); - - /* EEM packet header format: - * b0..13: length of ethernet frame - * b14: bmCRC (1 == valid Ethernet CRC) - * b15: bmType (0 == data) - */ - len = skb->len; - put_unaligned_le16(BIT(14) | len, skb_push(skb, 2)); - - /* Bundle a zero length EEM packet if needed */ - if (padlen) - put_unaligned_le16(0, skb_put(skb, 2)); - - return skb; -} - -static int eem_rx_fixup(struct usbnet *dev, struct sk_buff *skb) -{ - /* - * Our task here is to strip off framing, leaving skb with one - * data frame for the usbnet framework code to process. But we - * may have received multiple EEM payloads, or command payloads. - * So we must process _everything_ as if it's a header, except - * maybe the last data payload - * - * REVISIT the framework needs updating so that when we consume - * all payloads (the last or only message was a command, or a - * zero length EEM packet) that is not accounted as an rx_error. - */ - do { - struct sk_buff *skb2 = NULL; - u16 header; - u16 len = 0; - - /* incomplete EEM header? */ - if (skb->len < EEM_HEAD) - return 0; - - /* - * EEM packet header format: - * b0..14: EEM type dependent (Data or Command) - * b15: bmType - */ - header = get_unaligned_le16(skb->data); - skb_pull(skb, EEM_HEAD); - - /* - * The bmType bit helps to denote when EEM - * packet is data or command : - * bmType = 0 : EEM data payload - * bmType = 1 : EEM (link) command - */ - if (header & BIT(15)) { - u16 bmEEMCmd; - - /* - * EEM (link) command packet: - * b0..10: bmEEMCmdParam - * b11..13: bmEEMCmd - * b14: bmReserved (must be 0) - * b15: 1 (EEM command) - */ - if (header & BIT(14)) { - netdev_dbg(dev->net, "reserved command %04x\n", - header); - continue; - } - - bmEEMCmd = (header >> 11) & 0x7; - switch (bmEEMCmd) { - - /* Responding to echo requests is mandatory. */ - case 0: /* Echo command */ - len = header & 0x7FF; - - /* bogus command? */ - if (skb->len < len) - return 0; - - skb2 = skb_clone(skb, GFP_ATOMIC); - if (unlikely(!skb2)) - goto next; - skb_trim(skb2, len); - put_unaligned_le16(BIT(15) | (1 << 11) | len, - skb_push(skb2, 2)); - eem_linkcmd(dev, skb2); - break; - - /* - * Host may choose to ignore hints. - * - suspend: peripheral ready to suspend - * - response: suggest N millisec polling - * - response complete: suggest N sec polling - */ - case 2: /* Suspend hint */ - case 3: /* Response hint */ - case 4: /* Response complete hint */ - continue; - - /* - * Hosts should never receive host-to-peripheral - * or reserved command codes; or responses to an - * echo command we didn't send. - */ - case 1: /* Echo response */ - case 5: /* Tickle */ - default: /* reserved */ - netdev_warn(dev->net, - "unexpected link command %d\n", - bmEEMCmd); - continue; - } - - } else { - u32 crc, crc2; - int is_last; - - /* zero length EEM packet? */ - if (header == 0) - continue; - - /* - * EEM data packet header : - * b0..13: length of ethernet frame - * b14: bmCRC - * b15: 0 (EEM data) - */ - len = header & 0x3FFF; - - /* bogus EEM payload? */ - if (skb->len < len) - return 0; - - /* bogus ethernet frame? */ - if (len < (ETH_HLEN + ETH_FCS_LEN)) - goto next; - - /* - * Treat the last payload differently: framework - * code expects our "fixup" to have stripped off - * headers, so "skb" is a data packet (or error). - * Else if it's not the last payload, keep "skb" - * for further processing. - */ - is_last = (len == skb->len); - if (is_last) - skb2 = skb; - else { - skb2 = skb_clone(skb, GFP_ATOMIC); - if (unlikely(!skb2)) - return 0; - } - - /* - * The bmCRC helps to denote when the CRC field in - * the Ethernet frame contains a calculated CRC: - * bmCRC = 1 : CRC is calculated - * bmCRC = 0 : CRC = 0xDEADBEEF - */ - if (header & BIT(14)) { - crc = get_unaligned_le32(skb2->data - + len - ETH_FCS_LEN); - crc2 = ~crc32_le(~0, skb2->data, skb2->len - - ETH_FCS_LEN); - } else { - crc = get_unaligned_be32(skb2->data - + len - ETH_FCS_LEN); - crc2 = 0xdeadbeef; - } - skb_trim(skb2, len - ETH_FCS_LEN); - - if (is_last) - return crc == crc2; - - if (unlikely(crc != crc2)) { - dev->net->stats.rx_errors++; - dev_kfree_skb_any(skb2); - } else - usbnet_skb_return(dev, skb2); - } - -next: - skb_pull(skb, len); - } while (skb->len); - - return 1; -} - -static const struct driver_info eem_info = { - .description = "CDC EEM Device", - .flags = FLAG_ETHER | FLAG_POINTTOPOINT, - .bind = eem_bind, - .rx_fixup = eem_rx_fixup, - .tx_fixup = eem_tx_fixup, -}; - -/*-------------------------------------------------------------------------*/ - -static const struct usb_device_id products[] = { -{ - USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_EEM, - USB_CDC_PROTO_EEM), - .driver_info = (unsigned long) &eem_info, -}, -{ - /* EMPTY == end of list */ -}, -}; -MODULE_DEVICE_TABLE(usb, products); - -static struct usb_driver eem_driver = { - .name = "cdc_eem", - .id_table = products, - .probe = usbnet_probe, - .disconnect = usbnet_disconnect, - .suspend = usbnet_suspend, - .resume = usbnet_resume, -}; - -module_usb_driver(eem_driver); - -MODULE_AUTHOR("Omar Laazimani <omar.oberthur@gmail.com>"); -MODULE_DESCRIPTION("USB CDC EEM"); -MODULE_LICENSE("GPL"); |