--- /dev/null
+/*
+ * CAIF USB handler
+ * Copyright (C) ST-Ericsson AB 2011
+ * Author: Sjur Brendeland
+ * License terms: GNU General Public License (GPL) version 2
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
+
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <linux/mii.h>
+#include <linux/usb.h>
+#include <linux/usb/usbnet.h>
+#include <linux/etherdevice.h>
+#include <net/netns/generic.h>
+#include <net/caif/caif_dev.h>
+#include <net/caif/caif_layer.h>
+#include <net/caif/cfpkt.h>
+#include <net/caif/cfcnfg.h>
+
+MODULE_LICENSE("GPL");
+
+#define CFUSB_PAD_DESCR_SZ 1 /* Alignment descriptor length */
+#define CFUSB_ALIGNMENT 4 /* Number of bytes to align. */
+#define CFUSB_MAX_HEADLEN (CFUSB_PAD_DESCR_SZ + CFUSB_ALIGNMENT-1)
+#define STE_USB_VID 0x04cc /* USB Product ID for ST-Ericsson */
+#define STE_USB_PID_CAIF 0x230f /* Product id for CAIF Modems */
+
+struct cfusbl {
+ struct cflayer layer;
+ u8 tx_eth_hdr[ETH_HLEN];
+};
+
+static bool pack_added;
+
+static int cfusbl_receive(struct cflayer *layr, struct cfpkt *pkt)
+{
+ u8 hpad;
+
+ /* Remove padding. */
+ cfpkt_extr_head(pkt, &hpad, 1);
+ cfpkt_extr_head(pkt, NULL, hpad);
+ return layr->up->receive(layr->up, pkt);
+}
+
+static int cfusbl_transmit(struct cflayer *layr, struct cfpkt *pkt)
+{
+ struct caif_payload_info *info;
+ u8 hpad;
+ u8 zeros[CFUSB_ALIGNMENT];
+ struct sk_buff *skb;
+ struct cfusbl *usbl = container_of(layr, struct cfusbl, layer);
+
+ skb = cfpkt_tonative(pkt);
+
+ skb_reset_network_header(skb);
+ skb->protocol = htons(ETH_P_IP);
+
+ info = cfpkt_info(pkt);
+ hpad = (info->hdr_len + CFUSB_PAD_DESCR_SZ) & (CFUSB_ALIGNMENT - 1);
+
+ if (skb_headroom(skb) < ETH_HLEN + CFUSB_PAD_DESCR_SZ + hpad) {
+ pr_warn("Headroom to small\n");
+ kfree_skb(skb);
+ return -EIO;
+ }
+ memset(zeros, 0, hpad);
+
+ cfpkt_add_head(pkt, zeros, hpad);
+ cfpkt_add_head(pkt, &hpad, 1);
+ cfpkt_add_head(pkt, usbl->tx_eth_hdr, sizeof(usbl->tx_eth_hdr));
+ return layr->dn->transmit(layr->dn, pkt);
+}
+
+static void cfusbl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
+ int phyid)
+{
+ if (layr->up && layr->up->ctrlcmd)
+ layr->up->ctrlcmd(layr->up, ctrl, layr->id);
+}
+
+static struct cflayer *cfusbl_create(int phyid, u8 ethaddr[ETH_ALEN],
+ u8 braddr[ETH_ALEN])
+{
+ struct cfusbl *this = kmalloc(sizeof(struct cfusbl), GFP_ATOMIC);
+
+ if (!this)
+ return NULL;
+
+ caif_assert(offsetof(struct cfusbl, layer) == 0);
+
+ memset(&this->layer, 0, sizeof(this->layer));
+ this->layer.receive = cfusbl_receive;
+ this->layer.transmit = cfusbl_transmit;
+ this->layer.ctrlcmd = cfusbl_ctrlcmd;
+ snprintf(this->layer.name, CAIF_LAYER_NAME_SZ, "usb%d", phyid);
+ this->layer.id = phyid;
+
+ /*
+ * Construct TX ethernet header:
+ * 0-5 destination address
+ * 5-11 source address
+ * 12-13 protocol type
+ */
+ ether_addr_copy(&this->tx_eth_hdr[ETH_ALEN], braddr);
+ ether_addr_copy(&this->tx_eth_hdr[ETH_ALEN], ethaddr);
+ this->tx_eth_hdr[12] = cpu_to_be16(ETH_P_802_EX1) & 0xff;
+ this->tx_eth_hdr[13] = (cpu_to_be16(ETH_P_802_EX1) >> 8) & 0xff;
+ pr_debug("caif ethernet TX-header dst:%pM src:%pM type:%02x%02x\n",
+ this->tx_eth_hdr, this->tx_eth_hdr + ETH_ALEN,
+ this->tx_eth_hdr[12], this->tx_eth_hdr[13]);
+
+ return (struct cflayer *) this;
+}
+
+static struct packet_type caif_usb_type __read_mostly = {
+ .type = cpu_to_be16(ETH_P_802_EX1),
+};
+
+static int cfusbl_device_notify(struct notifier_block *me, unsigned long what,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct caif_dev_common common;
+ struct cflayer *layer, *link_support;
+ struct usbnet *usbnet;
+ struct usb_device *usbdev;
+
+ /* Check whether we have a NCM device, and find its VID/PID. */
+ if (!(dev->dev.parent && dev->dev.parent->driver &&
+ strcmp(dev->dev.parent->driver->name, "cdc_ncm") == 0))
+ return 0;
+
+ usbnet = netdev_priv(dev);
+ usbdev = usbnet->udev;
+
+ pr_debug("USB CDC NCM device VID:0x%4x PID:0x%4x\n",
+ le16_to_cpu(usbdev->descriptor.idVendor),
+ le16_to_cpu(usbdev->descriptor.idProduct));
+
+ /* Check for VID/PID that supports CAIF */
+ if (!(le16_to_cpu(usbdev->descriptor.idVendor) == STE_USB_VID &&
+ le16_to_cpu(usbdev->descriptor.idProduct) == STE_USB_PID_CAIF))
+ return 0;
+
+ if (what == NETDEV_UNREGISTER)
+ module_put(THIS_MODULE);
+
+ if (what != NETDEV_REGISTER)
+ return 0;
+
+ __module_get(THIS_MODULE);
+
+ memset(&common, 0, sizeof(common));
+ common.use_frag = false;
+ common.use_fcs = false;
+ common.use_stx = false;
+ common.link_select = CAIF_LINK_HIGH_BANDW;
+ common.flowctrl = NULL;
+
+ link_support = cfusbl_create(dev->ifindex, dev->dev_addr,
+ dev->broadcast);
+
+ if (!link_support)
+ return -ENOMEM;
+
+ if (dev->num_tx_queues > 1)
+ pr_warn("USB device uses more than one tx queue\n");
+
+ caif_enroll_dev(dev, &common, link_support, CFUSB_MAX_HEADLEN,
+ &layer, &caif_usb_type.func);
+ if (!pack_added)
+ dev_add_pack(&caif_usb_type);
+ pack_added = true;
+
+ strncpy(layer->name, dev->name,
+ sizeof(layer->name) - 1);
+ layer->name[sizeof(layer->name) - 1] = 0;
+
+ return 0;
+}
+
+static struct notifier_block caif_device_notifier = {
+ .notifier_call = cfusbl_device_notify,
+ .priority = 0,
+};
+
+static int __init cfusbl_init(void)
+{
+ return register_netdevice_notifier(&caif_device_notifier);
+}
+
+static void __exit cfusbl_exit(void)
+{
+ unregister_netdevice_notifier(&caif_device_notifier);
+ dev_remove_pack(&caif_usb_type);
+}
+
+module_init(cfusbl_init);
+module_exit(cfusbl_exit);
Code Review / kvmfornfv.git / blobdiff