423 lines
11 KiB
C
423 lines
11 KiB
C
/*
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* Copyright (c) 2012 Smith Micro Software, Inc.
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* Copyright (c) 2012 Bjørn Mork <bjorn@mork.no>
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*
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* This driver is based on and reuse most of cdc_ncm, which is
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* Copyright (C) ST-Ericsson 2010-2012
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/ethtool.h>
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#include <linux/if_vlan.h>
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#include <linux/ip.h>
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#include <linux/mii.h>
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#include <linux/usb.h>
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#include <linux/usb/cdc.h>
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#include <linux/usb/usbnet.h>
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#include <linux/usb/cdc-wdm.h>
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#include <linux/usb/cdc_ncm.h>
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/* driver specific data - must match cdc_ncm usage */
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struct cdc_mbim_state {
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struct cdc_ncm_ctx *ctx;
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atomic_t pmcount;
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struct usb_driver *subdriver;
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struct usb_interface *control;
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struct usb_interface *data;
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};
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/* using a counter to merge subdriver requests with our own into a combined state */
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static int cdc_mbim_manage_power(struct usbnet *dev, int on)
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{
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struct cdc_mbim_state *info = (void *)&dev->data;
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int rv = 0;
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dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on);
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if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) {
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/* need autopm_get/put here to ensure the usbcore sees the new value */
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rv = usb_autopm_get_interface(dev->intf);
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if (rv < 0)
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goto err;
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dev->intf->needs_remote_wakeup = on;
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usb_autopm_put_interface(dev->intf);
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}
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err:
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return rv;
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}
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static int cdc_mbim_wdm_manage_power(struct usb_interface *intf, int status)
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{
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struct usbnet *dev = usb_get_intfdata(intf);
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/* can be called while disconnecting */
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if (!dev)
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return 0;
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return cdc_mbim_manage_power(dev, status);
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}
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static int cdc_mbim_bind(struct usbnet *dev, struct usb_interface *intf)
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{
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struct cdc_ncm_ctx *ctx;
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struct usb_driver *subdriver = ERR_PTR(-ENODEV);
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int ret = -ENODEV;
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u8 data_altsetting = cdc_ncm_select_altsetting(dev, intf);
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struct cdc_mbim_state *info = (void *)&dev->data;
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/* Probably NCM, defer for cdc_ncm_bind */
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if (!cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
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goto err;
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ret = cdc_ncm_bind_common(dev, intf, data_altsetting);
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if (ret)
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goto err;
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ctx = info->ctx;
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/* The MBIM descriptor and the status endpoint are required */
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if (ctx->mbim_desc && dev->status)
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subdriver = usb_cdc_wdm_register(ctx->control,
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&dev->status->desc,
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le16_to_cpu(ctx->mbim_desc->wMaxControlMessage),
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cdc_mbim_wdm_manage_power);
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if (IS_ERR(subdriver)) {
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ret = PTR_ERR(subdriver);
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cdc_ncm_unbind(dev, intf);
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goto err;
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}
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/* can't let usbnet use the interrupt endpoint */
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dev->status = NULL;
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info->subdriver = subdriver;
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/* MBIM cannot do ARP */
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dev->net->flags |= IFF_NOARP;
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/* no need to put the VLAN tci in the packet headers */
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dev->net->features |= NETIF_F_HW_VLAN_TX;
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err:
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return ret;
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}
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static void cdc_mbim_unbind(struct usbnet *dev, struct usb_interface *intf)
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{
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struct cdc_mbim_state *info = (void *)&dev->data;
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struct cdc_ncm_ctx *ctx = info->ctx;
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/* disconnect subdriver from control interface */
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if (info->subdriver && info->subdriver->disconnect)
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info->subdriver->disconnect(ctx->control);
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info->subdriver = NULL;
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/* let NCM unbind clean up both control and data interface */
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cdc_ncm_unbind(dev, intf);
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}
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static struct sk_buff *cdc_mbim_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
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{
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struct sk_buff *skb_out;
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struct cdc_mbim_state *info = (void *)&dev->data;
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struct cdc_ncm_ctx *ctx = info->ctx;
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__le32 sign = cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN);
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u16 tci = 0;
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u8 *c;
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if (!ctx)
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goto error;
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if (skb) {
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if (skb->len <= sizeof(ETH_HLEN))
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goto error;
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/* mapping VLANs to MBIM sessions:
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* no tag => IPS session <0>
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* 1 - 255 => IPS session <vlanid>
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* 256 - 511 => DSS session <vlanid - 256>
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* 512 - 4095 => unsupported, drop
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*/
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vlan_get_tag(skb, &tci);
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switch (tci & 0x0f00) {
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case 0x0000: /* VLAN ID 0 - 255 */
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/* verify that datagram is IPv4 or IPv6 */
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skb_reset_mac_header(skb);
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switch (eth_hdr(skb)->h_proto) {
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case htons(ETH_P_IP):
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case htons(ETH_P_IPV6):
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break;
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default:
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goto error;
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}
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c = (u8 *)&sign;
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c[3] = tci;
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break;
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case 0x0100: /* VLAN ID 256 - 511 */
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sign = cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN);
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c = (u8 *)&sign;
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c[3] = tci;
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break;
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default:
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netif_err(dev, tx_err, dev->net,
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"unsupported tci=0x%04x\n", tci);
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goto error;
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}
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skb_pull(skb, ETH_HLEN);
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}
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spin_lock_bh(&ctx->mtx);
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skb_out = cdc_ncm_fill_tx_frame(ctx, skb, sign);
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spin_unlock_bh(&ctx->mtx);
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return skb_out;
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error:
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if (skb)
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dev_kfree_skb_any(skb);
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return NULL;
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}
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static struct sk_buff *cdc_mbim_process_dgram(struct usbnet *dev, u8 *buf, size_t len, u16 tci)
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{
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__be16 proto = htons(ETH_P_802_3);
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struct sk_buff *skb = NULL;
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if (tci < 256) { /* IPS session? */
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if (len < sizeof(struct iphdr))
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goto err;
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switch (*buf & 0xf0) {
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case 0x40:
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proto = htons(ETH_P_IP);
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break;
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case 0x60:
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proto = htons(ETH_P_IPV6);
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break;
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default:
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goto err;
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}
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}
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skb = netdev_alloc_skb_ip_align(dev->net, len + ETH_HLEN);
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if (!skb)
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goto err;
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/* add an ethernet header */
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skb_put(skb, ETH_HLEN);
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skb_reset_mac_header(skb);
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eth_hdr(skb)->h_proto = proto;
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memset(eth_hdr(skb)->h_source, 0, ETH_ALEN);
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memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);
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/* add datagram */
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memcpy(skb_put(skb, len), buf, len);
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/* map MBIM session to VLAN */
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if (tci)
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vlan_put_tag(skb, tci);
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err:
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return skb;
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}
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static int cdc_mbim_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
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{
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struct sk_buff *skb;
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struct cdc_mbim_state *info = (void *)&dev->data;
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struct cdc_ncm_ctx *ctx = info->ctx;
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int len;
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int nframes;
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int x;
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int offset;
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struct usb_cdc_ncm_ndp16 *ndp16;
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struct usb_cdc_ncm_dpe16 *dpe16;
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int ndpoffset;
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int loopcount = 50; /* arbitrary max preventing infinite loop */
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u8 *c;
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u16 tci;
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ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
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if (ndpoffset < 0)
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goto error;
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next_ndp:
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nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
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if (nframes < 0)
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goto error;
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ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
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switch (ndp16->dwSignature & cpu_to_le32(0x00ffffff)) {
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case cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN):
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c = (u8 *)&ndp16->dwSignature;
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tci = c[3];
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break;
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case cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN):
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c = (u8 *)&ndp16->dwSignature;
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tci = c[3] + 256;
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break;
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default:
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netif_dbg(dev, rx_err, dev->net,
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"unsupported NDP signature <0x%08x>\n",
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le32_to_cpu(ndp16->dwSignature));
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goto err_ndp;
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}
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dpe16 = ndp16->dpe16;
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for (x = 0; x < nframes; x++, dpe16++) {
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offset = le16_to_cpu(dpe16->wDatagramIndex);
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len = le16_to_cpu(dpe16->wDatagramLength);
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/*
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* CDC NCM ch. 3.7
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* All entries after first NULL entry are to be ignored
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*/
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if ((offset == 0) || (len == 0)) {
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if (!x)
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goto err_ndp; /* empty NTB */
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break;
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}
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/* sanity checking */
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if (((offset + len) > skb_in->len) || (len > ctx->rx_max)) {
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netif_dbg(dev, rx_err, dev->net,
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"invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
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x, offset, len, skb_in);
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if (!x)
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goto err_ndp;
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break;
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} else {
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skb = cdc_mbim_process_dgram(dev, skb_in->data + offset, len, tci);
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if (!skb)
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goto error;
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usbnet_skb_return(dev, skb);
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}
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}
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err_ndp:
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/* are there more NDPs to process? */
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ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
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if (ndpoffset && loopcount--)
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goto next_ndp;
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return 1;
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error:
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return 0;
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}
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static int cdc_mbim_suspend(struct usb_interface *intf, pm_message_t message)
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{
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int ret = 0;
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struct usbnet *dev = usb_get_intfdata(intf);
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struct cdc_mbim_state *info = (void *)&dev->data;
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struct cdc_ncm_ctx *ctx = info->ctx;
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if (ctx == NULL) {
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ret = -1;
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goto error;
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}
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ret = usbnet_suspend(intf, message);
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if (ret < 0)
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goto error;
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if (intf == ctx->control && info->subdriver && info->subdriver->suspend)
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ret = info->subdriver->suspend(intf, message);
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if (ret < 0)
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usbnet_resume(intf);
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error:
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return ret;
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}
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static int cdc_mbim_resume(struct usb_interface *intf)
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{
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int ret = 0;
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struct usbnet *dev = usb_get_intfdata(intf);
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struct cdc_mbim_state *info = (void *)&dev->data;
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struct cdc_ncm_ctx *ctx = info->ctx;
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bool callsub = (intf == ctx->control && info->subdriver && info->subdriver->resume);
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if (callsub)
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ret = info->subdriver->resume(intf);
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if (ret < 0)
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goto err;
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ret = usbnet_resume(intf);
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if (ret < 0 && callsub && info->subdriver->suspend)
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info->subdriver->suspend(intf, PMSG_SUSPEND);
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err:
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return ret;
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}
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static const struct driver_info cdc_mbim_info = {
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.description = "CDC MBIM",
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.flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN,
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.bind = cdc_mbim_bind,
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.unbind = cdc_mbim_unbind,
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.manage_power = cdc_mbim_manage_power,
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.rx_fixup = cdc_mbim_rx_fixup,
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.tx_fixup = cdc_mbim_tx_fixup,
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};
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/* MBIM and NCM devices should not need a ZLP after NTBs with
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* dwNtbOutMaxSize length. This driver_info is for the exceptional
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* devices requiring it anyway, allowing them to be supported without
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* forcing the performance penalty on all the sane devices.
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*/
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static const struct driver_info cdc_mbim_info_zlp = {
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.description = "CDC MBIM",
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.flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN | FLAG_SEND_ZLP,
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.bind = cdc_mbim_bind,
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.unbind = cdc_mbim_unbind,
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.manage_power = cdc_mbim_manage_power,
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.rx_fixup = cdc_mbim_rx_fixup,
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.tx_fixup = cdc_mbim_tx_fixup,
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};
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static const struct usb_device_id mbim_devs[] = {
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/* This duplicate NCM entry is intentional. MBIM devices can
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* be disguised as NCM by default, and this is necessary to
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* allow us to bind the correct driver_info to such devices.
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*
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* bind() will sort out this for us, selecting the correct
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* entry and reject the other
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*/
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{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
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.driver_info = (unsigned long)&cdc_mbim_info,
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},
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/* Sierra Wireless MC7710 need ZLPs */
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{ USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x68a2, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
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.driver_info = (unsigned long)&cdc_mbim_info_zlp,
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},
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{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
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.driver_info = (unsigned long)&cdc_mbim_info,
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},
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{
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},
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};
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MODULE_DEVICE_TABLE(usb, mbim_devs);
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static struct usb_driver cdc_mbim_driver = {
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.name = "cdc_mbim",
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.id_table = mbim_devs,
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.probe = usbnet_probe,
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.disconnect = usbnet_disconnect,
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.suspend = cdc_mbim_suspend,
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.resume = cdc_mbim_resume,
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.reset_resume = cdc_mbim_resume,
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.supports_autosuspend = 1,
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.disable_hub_initiated_lpm = 1,
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};
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module_usb_driver(cdc_mbim_driver);
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MODULE_AUTHOR("Greg Suarez <gsuarez@smithmicro.com>");
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MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
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MODULE_DESCRIPTION("USB CDC MBIM host driver");
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MODULE_LICENSE("GPL");
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