[mirror_ubuntu-artful-kernel.git] / drivers / net / wireless / brcm80211 / brcmfmac / dhd_linux.c

/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/kernel.h>
#include <linux/etherdevice.h>
#include <linux/module.h>
#include <net/cfg80211.h>
#include <net/rtnetlink.h>
#include <brcmu_utils.h>
#include <brcmu_wifi.h>

#include "dhd.h"
#include "dhd_bus.h"
#include "dhd_proto.h"
#include "dhd_dbg.h"
#include "fwil_types.h"
#include "p2p.h"
#include "wl_cfg80211.h"
#include "fwil.h"
#include "fwsignal.h"

MODULE_AUTHOR("Broadcom Corporation");
MODULE_DESCRIPTION("Broadcom 802.11 wireless LAN fullmac driver.");
MODULE_LICENSE("Dual BSD/GPL");

#define MAX_WAIT_FOR_8021X_TX           50      /* msecs */

/* Error bits */
int brcmf_msg_level;
module_param_named(debug, brcmf_msg_level, int, S_IRUSR | S_IWUSR);
MODULE_PARM_DESC(debug, "level of debug output");

/* P2P0 enable */
static int brcmf_p2p_enable;
#ifdef CONFIG_BRCMDBG
module_param_named(p2pon, brcmf_p2p_enable, int, 0);
MODULE_PARM_DESC(p2pon, "enable p2p management functionality");
#endif

char *brcmf_ifname(struct brcmf_pub *drvr, int ifidx)
{
        if (ifidx < 0 || ifidx >= BRCMF_MAX_IFS) {
                brcmf_err("ifidx %d out of range\n", ifidx);
                return "<if_bad>";
        }

        if (drvr->iflist[ifidx] == NULL) {
                brcmf_err("null i/f %d\n", ifidx);
                return "<if_null>";
        }

        if (drvr->iflist[ifidx]->ndev)
                return drvr->iflist[ifidx]->ndev->name;

        return "<if_none>";
}

static void _brcmf_set_multicast_list(struct work_struct *work)
{
        struct brcmf_if *ifp;
        struct net_device *ndev;
        struct netdev_hw_addr *ha;
        u32 cmd_value, cnt;
        __le32 cnt_le;
        char *buf, *bufp;
        u32 buflen;
        s32 err;

        ifp = container_of(work, struct brcmf_if, multicast_work);

        brcmf_dbg(TRACE, "Enter, idx=%d\n", ifp->bssidx);

        ndev = ifp->ndev;

        /* Determine initial value of allmulti flag */
        cmd_value = (ndev->flags & IFF_ALLMULTI) ? true : false;

        /* Send down the multicast list first. */
        cnt = netdev_mc_count(ndev);
        buflen = sizeof(cnt) + (cnt * ETH_ALEN);
        buf = kmalloc(buflen, GFP_ATOMIC);
        if (!buf)
                return;
        bufp = buf;

        cnt_le = cpu_to_le32(cnt);
        memcpy(bufp, &cnt_le, sizeof(cnt_le));
        bufp += sizeof(cnt_le);

        netdev_for_each_mc_addr(ha, ndev) {
                if (!cnt)
                        break;
                memcpy(bufp, ha->addr, ETH_ALEN);
                bufp += ETH_ALEN;
                cnt--;
        }

        err = brcmf_fil_iovar_data_set(ifp, "mcast_list", buf, buflen);
        if (err < 0) {
                brcmf_err("Setting mcast_list failed, %d\n", err);
                cmd_value = cnt ? true : cmd_value;
        }

        kfree(buf);

        /*
         * Now send the allmulti setting.  This is based on the setting in the
         * net_device flags, but might be modified above to be turned on if we
         * were trying to set some addresses and dongle rejected it...
         */
        err = brcmf_fil_iovar_int_set(ifp, "allmulti", cmd_value);
        if (err < 0)
                brcmf_err("Setting allmulti failed, %d\n", err);

        /*Finally, pick up the PROMISC flag */
        cmd_value = (ndev->flags & IFF_PROMISC) ? true : false;
        err = brcmf_fil_cmd_int_set(ifp, BRCMF_C_SET_PROMISC, cmd_value);
        if (err < 0)
                brcmf_err("Setting BRCMF_C_SET_PROMISC failed, %d\n",
                          err);
}

static void
_brcmf_set_mac_address(struct work_struct *work)
{
        struct brcmf_if *ifp;
        s32 err;

        ifp = container_of(work, struct brcmf_if, setmacaddr_work);

        brcmf_dbg(TRACE, "Enter, idx=%d\n", ifp->bssidx);

        err = brcmf_fil_iovar_data_set(ifp, "cur_etheraddr", ifp->mac_addr,
                                       ETH_ALEN);
        if (err < 0) {
                brcmf_err("Setting cur_etheraddr failed, %d\n", err);
        } else {
                brcmf_dbg(TRACE, "MAC address updated to %pM\n",
                          ifp->mac_addr);
                memcpy(ifp->ndev->dev_addr, ifp->mac_addr, ETH_ALEN);
        }
}

static int brcmf_netdev_set_mac_address(struct net_device *ndev, void *addr)
{
        struct brcmf_if *ifp = netdev_priv(ndev);
        struct sockaddr *sa = (struct sockaddr *)addr;

        memcpy(&ifp->mac_addr, sa->sa_data, ETH_ALEN);
        schedule_work(&ifp->setmacaddr_work);
        return 0;
}

static void brcmf_netdev_set_multicast_list(struct net_device *ndev)
{
        struct brcmf_if *ifp = netdev_priv(ndev);

        schedule_work(&ifp->multicast_work);
}

static netdev_tx_t brcmf_netdev_start_xmit(struct sk_buff *skb,
                                           struct net_device *ndev)
{
        int ret;
        struct brcmf_if *ifp = netdev_priv(ndev);
        struct brcmf_pub *drvr = ifp->drvr;
        struct ethhdr *eh;

        brcmf_dbg(TRACE, "Enter, idx=%d\n", ifp->bssidx);

        /* Can the device send data? */
        if (drvr->bus_if->state != BRCMF_BUS_DATA) {
                brcmf_err("xmit rejected state=%d\n", drvr->bus_if->state);
                netif_stop_queue(ndev);
                dev_kfree_skb(skb);
                ret = -ENODEV;
                goto done;
        }

        if (!drvr->iflist[ifp->bssidx]) {
                brcmf_err("bad ifidx %d\n", ifp->bssidx);
                netif_stop_queue(ndev);
                dev_kfree_skb(skb);
                ret = -ENODEV;
                goto done;
        }

        /* Make sure there's enough room for any header */
        if (skb_headroom(skb) < drvr->hdrlen) {
                struct sk_buff *skb2;

                brcmf_dbg(INFO, "%s: insufficient headroom\n",
                          brcmf_ifname(drvr, ifp->bssidx));
                drvr->bus_if->tx_realloc++;
                skb2 = skb_realloc_headroom(skb, drvr->hdrlen);
                dev_kfree_skb(skb);
                skb = skb2;
                if (skb == NULL) {
                        brcmf_err("%s: skb_realloc_headroom failed\n",
                                  brcmf_ifname(drvr, ifp->bssidx));
                        ret = -ENOMEM;
                        goto done;
                }
        }

        /* validate length for ether packet */
        if (skb->len < sizeof(*eh)) {
                ret = -EINVAL;
                dev_kfree_skb(skb);
                goto done;
        }

        /* handle ethernet header */
        eh = (struct ethhdr *)(skb->data);
        if (is_multicast_ether_addr(eh->h_dest))
                drvr->tx_multicast++;
        if (ntohs(eh->h_proto) == ETH_P_PAE)
                atomic_inc(&ifp->pend_8021x_cnt);

        /* If the protocol uses a data header, apply it */
        brcmf_proto_hdrpush(drvr, ifp->ifidx, skb);

        /* Use bus module to send data frame */
        ret =  brcmf_bus_txdata(drvr->bus_if, skb);

done:
        if (ret) {
                ifp->stats.tx_dropped++;
        } else {
                ifp->stats.tx_packets++;
                ifp->stats.tx_bytes += skb->len;
        }

        /* Return ok: we always eat the packet */
        return NETDEV_TX_OK;
}

void brcmf_txflowblock(struct device *dev, bool state)
{
        struct net_device *ndev;
        struct brcmf_bus *bus_if = dev_get_drvdata(dev);
        struct brcmf_pub *drvr = bus_if->drvr;
        int i;

        brcmf_dbg(TRACE, "Enter\n");

        for (i = 0; i < BRCMF_MAX_IFS; i++)
                if (drvr->iflist[i]) {
                        ndev = drvr->iflist[i]->ndev;
                        if (state)
                                netif_stop_queue(ndev);
                        else
                                netif_wake_queue(ndev);
                }
}

void brcmf_rx_frames(struct device *dev, struct sk_buff_head *skb_list)
{
        unsigned char *eth;
        uint len;
        struct sk_buff *skb, *pnext;
        struct brcmf_if *ifp;
        struct brcmf_bus *bus_if = dev_get_drvdata(dev);
        struct brcmf_pub *drvr = bus_if->drvr;
        u8 ifidx;
        int ret;

        brcmf_dbg(TRACE, "Enter\n");

        skb_queue_walk_safe(skb_list, skb, pnext) {
                skb_unlink(skb, skb_list);

                /* process and remove protocol-specific header */
                ret = brcmf_proto_hdrpull(drvr, drvr->fw_signals, &ifidx, skb);
                ifp = drvr->iflist[ifidx];

                if (ret || !ifp || !ifp->ndev) {
                        if ((ret != -ENODATA) && ifp)
                                ifp->stats.rx_errors++;
                        brcmu_pkt_buf_free_skb(skb);
                        continue;
                }

                /* Get the protocol, maintain skb around eth_type_trans()
                 * The main reason for this hack is for the limitation of
                 * Linux 2.4 where 'eth_type_trans' uses the
                 * 'net->hard_header_len'
                 * to perform skb_pull inside vs ETH_HLEN. Since to avoid
                 * coping of the packet coming from the network stack to add
                 * BDC, Hardware header etc, during network interface
                 * registration
                 * we set the 'net->hard_header_len' to ETH_HLEN + extra space
                 * required
                 * for BDC, Hardware header etc. and not just the ETH_HLEN
                 */
                eth = skb->data;
                len = skb->len;

                skb->dev = ifp->ndev;
                skb->protocol = eth_type_trans(skb, skb->dev);

                if (skb->pkt_type == PACKET_MULTICAST)
                        ifp->stats.multicast++;

                skb->data = eth;
                skb->len = len;

                /* Strip header, count, deliver upward */
                skb_pull(skb, ETH_HLEN);

                /* Process special event packets and then discard them */
                brcmf_fweh_process_skb(drvr, skb, &ifidx);

                if (drvr->iflist[ifidx]) {
                        ifp = drvr->iflist[ifidx];
                        ifp->ndev->last_rx = jiffies;
                }

                if (!(ifp->ndev->flags & IFF_UP)) {
                        brcmu_pkt_buf_free_skb(skb);
                        continue;
                }

                ifp->stats.rx_bytes += skb->len;
                ifp->stats.rx_packets++;

                if (in_interrupt())
                        netif_rx(skb);
                else
                        /* If the receive is not processed inside an ISR,
                         * the softirqd must be woken explicitly to service
                         * the NET_RX_SOFTIRQ.  In 2.6 kernels, this is handled
                         * by netif_rx_ni(), but in earlier kernels, we need
                         * to do it manually.
                         */
                        netif_rx_ni(skb);
        }
}

void brcmf_txcomplete(struct device *dev, struct sk_buff *txp, bool success)
{
        u8 ifidx;
        struct ethhdr *eh;
        u16 type;
        struct brcmf_bus *bus_if = dev_get_drvdata(dev);
        struct brcmf_pub *drvr = bus_if->drvr;
        struct brcmf_if *ifp;
        int res;

        res = brcmf_proto_hdrpull(drvr, false, &ifidx, txp);

        ifp = drvr->iflist[ifidx];
        if (!ifp)
                return;

        if (res == 0) {
                eh = (struct ethhdr *)(txp->data);
                type = ntohs(eh->h_proto);

                if (type == ETH_P_PAE) {
                        atomic_dec(&ifp->pend_8021x_cnt);
                        if (waitqueue_active(&ifp->pend_8021x_wait))
                                wake_up(&ifp->pend_8021x_wait);
                }
        }
        if (!success)
                ifp->stats.tx_errors++;
}

static struct net_device_stats *brcmf_netdev_get_stats(struct net_device *ndev)
{
        struct brcmf_if *ifp = netdev_priv(ndev);

        brcmf_dbg(TRACE, "Enter, idx=%d\n", ifp->bssidx);

        return &ifp->stats;
}

/*
 * Set current toe component enables in toe_ol iovar,
 * and set toe global enable iovar
 */
static int brcmf_toe_set(struct brcmf_if *ifp, u32 toe_ol)
{
        s32 err;

        err = brcmf_fil_iovar_int_set(ifp, "toe_ol", toe_ol);
        if (err < 0) {
                brcmf_err("Setting toe_ol failed, %d\n", err);
                return err;
        }

        err = brcmf_fil_iovar_int_set(ifp, "toe", (toe_ol != 0));
        if (err < 0)
                brcmf_err("Setting toe failed, %d\n", err);

        return err;

}

static void brcmf_ethtool_get_drvinfo(struct net_device *ndev,
                                    struct ethtool_drvinfo *info)
{
        struct brcmf_if *ifp = netdev_priv(ndev);
        struct brcmf_pub *drvr = ifp->drvr;

        strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
        snprintf(info->version, sizeof(info->version), "%lu",
                 drvr->drv_version);
        strlcpy(info->bus_info, dev_name(drvr->bus_if->dev),
                sizeof(info->bus_info));
}

static const struct ethtool_ops brcmf_ethtool_ops = {
        .get_drvinfo = brcmf_ethtool_get_drvinfo,
};

static int brcmf_ethtool(struct brcmf_if *ifp, void __user *uaddr)
{
        struct brcmf_pub *drvr = ifp->drvr;
        struct ethtool_drvinfo info;
        char drvname[sizeof(info.driver)];
        u32 cmd;
        struct ethtool_value edata;
        u32 toe_cmpnt, csum_dir;
        int ret;

        brcmf_dbg(TRACE, "Enter, idx=%d\n", ifp->bssidx);

        /* all ethtool calls start with a cmd word */
        if (copy_from_user(&cmd, uaddr, sizeof(u32)))
                return -EFAULT;

        switch (cmd) {
        case ETHTOOL_GDRVINFO:
                /* Copy out any request driver name */
                if (copy_from_user(&info, uaddr, sizeof(info)))
                        return -EFAULT;
                strncpy(drvname, info.driver, sizeof(info.driver));
                drvname[sizeof(info.driver) - 1] = '\0';

                /* clear struct for return */
                memset(&info, 0, sizeof(info));
                info.cmd = cmd;

                /* if requested, identify ourselves */
                if (strcmp(drvname, "?dhd") == 0) {
                        sprintf(info.driver, "dhd");
                        strcpy(info.version, BRCMF_VERSION_STR);
                }
                /* report dongle driver type */
                else
                        sprintf(info.driver, "wl");

                sprintf(info.version, "%lu", drvr->drv_version);
                if (copy_to_user(uaddr, &info, sizeof(info)))
                        return -EFAULT;
                brcmf_dbg(TRACE, "given %*s, returning %s\n",
                          (int)sizeof(drvname), drvname, info.driver);
                break;

                /* Get toe offload components from dongle */
        case ETHTOOL_GRXCSUM:
        case ETHTOOL_GTXCSUM:
                ret = brcmf_fil_iovar_int_get(ifp, "toe_ol", &toe_cmpnt);
                if (ret < 0)
                        return ret;

                csum_dir =
                    (cmd == ETHTOOL_GTXCSUM) ? TOE_TX_CSUM_OL : TOE_RX_CSUM_OL;

                edata.cmd = cmd;
                edata.data = (toe_cmpnt & csum_dir) ? 1 : 0;

                if (copy_to_user(uaddr, &edata, sizeof(edata)))
                        return -EFAULT;
                break;

                /* Set toe offload components in dongle */
        case ETHTOOL_SRXCSUM:
        case ETHTOOL_STXCSUM:
                if (copy_from_user(&edata, uaddr, sizeof(edata)))
                        return -EFAULT;

                /* Read the current settings, update and write back */
                ret = brcmf_fil_iovar_int_get(ifp, "toe_ol", &toe_cmpnt);
                if (ret < 0)
                        return ret;

                csum_dir =
                    (cmd == ETHTOOL_STXCSUM) ? TOE_TX_CSUM_OL : TOE_RX_CSUM_OL;

                if (edata.data != 0)
                        toe_cmpnt |= csum_dir;
                else
                        toe_cmpnt &= ~csum_dir;

                ret = brcmf_toe_set(ifp, toe_cmpnt);
                if (ret < 0)
                        return ret;

                /* If setting TX checksum mode, tell Linux the new mode */
                if (cmd == ETHTOOL_STXCSUM) {
                        if (edata.data)
                                ifp->ndev->features |= NETIF_F_IP_CSUM;
                        else
                                ifp->ndev->features &= ~NETIF_F_IP_CSUM;
                }

                break;

        default:
                return -EOPNOTSUPP;
        }

        return 0;
}

static int brcmf_netdev_ioctl_entry(struct net_device *ndev, struct ifreq *ifr,
                                    int cmd)
{
        struct brcmf_if *ifp = netdev_priv(ndev);
        struct brcmf_pub *drvr = ifp->drvr;

        brcmf_dbg(TRACE, "Enter, idx=%d, cmd=0x%04x\n", ifp->bssidx, cmd);

        if (!drvr->iflist[ifp->bssidx])
                return -1;

        if (cmd == SIOCETHTOOL)
                return brcmf_ethtool(ifp, ifr->ifr_data);

        return -EOPNOTSUPP;
}

static int brcmf_netdev_stop(struct net_device *ndev)
{
        struct brcmf_if *ifp = netdev_priv(ndev);

        brcmf_dbg(TRACE, "Enter, idx=%d\n", ifp->bssidx);

        brcmf_cfg80211_down(ndev);

        /* Set state and stop OS transmissions */
        netif_stop_queue(ndev);

        return 0;
}

static int brcmf_netdev_open(struct net_device *ndev)
{
        struct brcmf_if *ifp = netdev_priv(ndev);
        struct brcmf_pub *drvr = ifp->drvr;
        struct brcmf_bus *bus_if = drvr->bus_if;
        u32 toe_ol;
        s32 ret = 0;

        brcmf_dbg(TRACE, "Enter, idx=%d\n", ifp->bssidx);

        /* If bus is not ready, can't continue */
        if (bus_if->state != BRCMF_BUS_DATA) {
                brcmf_err("failed bus is not ready\n");
                return -EAGAIN;
        }

        atomic_set(&ifp->pend_8021x_cnt, 0);

        /* Get current TOE mode from dongle */
        if (brcmf_fil_iovar_int_get(ifp, "toe_ol", &toe_ol) >= 0
            && (toe_ol & TOE_TX_CSUM_OL) != 0)
                ndev->features |= NETIF_F_IP_CSUM;
        else
                ndev->features &= ~NETIF_F_IP_CSUM;

        /* Allow transmit calls */
        netif_start_queue(ndev);
        if (brcmf_cfg80211_up(ndev)) {
                brcmf_err("failed to bring up cfg80211\n");
                return -1;
        }

        return ret;
}

static const struct net_device_ops brcmf_netdev_ops_pri = {
        .ndo_open = brcmf_netdev_open,
        .ndo_stop = brcmf_netdev_stop,
        .ndo_get_stats = brcmf_netdev_get_stats,
        .ndo_do_ioctl = brcmf_netdev_ioctl_entry,
        .ndo_start_xmit = brcmf_netdev_start_xmit,
        .ndo_set_mac_address = brcmf_netdev_set_mac_address,
        .ndo_set_rx_mode = brcmf_netdev_set_multicast_list
};

int brcmf_net_attach(struct brcmf_if *ifp, bool rtnl_locked)
{
        struct brcmf_pub *drvr = ifp->drvr;
        struct net_device *ndev;
        s32 err;

        brcmf_dbg(TRACE, "Enter, idx=%d mac=%pM\n", ifp->bssidx,
                  ifp->mac_addr);
        ndev = ifp->ndev;

        /* set appropriate operations */
        ndev->netdev_ops = &brcmf_netdev_ops_pri;

        ndev->hard_header_len = ETH_HLEN + drvr->hdrlen;
        ndev->ethtool_ops = &brcmf_ethtool_ops;

        drvr->rxsz = ndev->mtu + ndev->hard_header_len +
                              drvr->hdrlen;

        /* set the mac address */
        memcpy(ndev->dev_addr, ifp->mac_addr, ETH_ALEN);

        INIT_WORK(&ifp->setmacaddr_work, _brcmf_set_mac_address);
        INIT_WORK(&ifp->multicast_work, _brcmf_set_multicast_list);

        if (rtnl_locked)
                err = register_netdevice(ndev);
        else
                err = register_netdev(ndev);
        if (err != 0) {
                brcmf_err("couldn't register the net device\n");
                goto fail;
        }

        brcmf_dbg(INFO, "%s: Broadcom Dongle Host Driver\n", ndev->name);

        return 0;

fail:
        ndev->netdev_ops = NULL;
        return -EBADE;
}

static int brcmf_net_p2p_open(struct net_device *ndev)
{
        brcmf_dbg(TRACE, "Enter\n");

        return brcmf_cfg80211_up(ndev);
}

static int brcmf_net_p2p_stop(struct net_device *ndev)
{
        brcmf_dbg(TRACE, "Enter\n");

        return brcmf_cfg80211_down(ndev);
}

static int brcmf_net_p2p_do_ioctl(struct net_device *ndev,
                                  struct ifreq *ifr, int cmd)
{
        brcmf_dbg(TRACE, "Enter\n");
        return 0;
}

static netdev_tx_t brcmf_net_p2p_start_xmit(struct sk_buff *skb,
                                            struct net_device *ndev)
{
        if (skb)
                dev_kfree_skb_any(skb);

        return NETDEV_TX_OK;
}

static const struct net_device_ops brcmf_netdev_ops_p2p = {
        .ndo_open = brcmf_net_p2p_open,
        .ndo_stop = brcmf_net_p2p_stop,
        .ndo_do_ioctl = brcmf_net_p2p_do_ioctl,
        .ndo_start_xmit = brcmf_net_p2p_start_xmit
};

static int brcmf_net_p2p_attach(struct brcmf_if *ifp)
{
        struct net_device *ndev;

        brcmf_dbg(TRACE, "Enter, idx=%d mac=%pM\n", ifp->bssidx,
                  ifp->mac_addr);
        ndev = ifp->ndev;

        ndev->netdev_ops = &brcmf_netdev_ops_p2p;

        /* set the mac address */
        memcpy(ndev->dev_addr, ifp->mac_addr, ETH_ALEN);

        if (register_netdev(ndev) != 0) {
                brcmf_err("couldn't register the p2p net device\n");
                goto fail;
        }

        brcmf_dbg(INFO, "%s: Broadcom Dongle Host Driver\n", ndev->name);

        return 0;

fail:
        return -EBADE;
}

struct brcmf_if *brcmf_add_if(struct brcmf_pub *drvr, s32 bssidx, s32 ifidx,
                              char *name, u8 *mac_addr)
{
        struct brcmf_if *ifp;
        struct net_device *ndev;

        brcmf_dbg(TRACE, "Enter, idx=%d, ifidx=%d\n", bssidx, ifidx);

        ifp = drvr->iflist[bssidx];
        /*
         * Delete the existing interface before overwriting it
         * in case we missed the BRCMF_E_IF_DEL event.
         */
        if (ifp) {
                brcmf_err("ERROR: netdev:%s already exists\n",
                          ifp->ndev->name);
                if (ifidx) {
                        netif_stop_queue(ifp->ndev);
                        unregister_netdev(ifp->ndev);
                        free_netdev(ifp->ndev);
                        drvr->iflist[bssidx] = NULL;
                } else {
                        brcmf_err("ignore IF event\n");
                        return ERR_PTR(-EINVAL);
                }
        }

        /* Allocate netdev, including space for private structure */
        ndev = alloc_netdev(sizeof(struct brcmf_if), name, ether_setup);
        if (!ndev) {
                brcmf_err("OOM - alloc_netdev\n");
                return ERR_PTR(-ENOMEM);
        }

        ifp = netdev_priv(ndev);
        ifp->ndev = ndev;
        ifp->drvr = drvr;
        drvr->iflist[bssidx] = ifp;
        ifp->ifidx = ifidx;
        ifp->bssidx = bssidx;


        init_waitqueue_head(&ifp->pend_8021x_wait);

        if (mac_addr != NULL)
                memcpy(ifp->mac_addr, mac_addr, ETH_ALEN);

        brcmf_dbg(TRACE, " ==== pid:%x, if:%s (%pM) created ===\n",
                  current->pid, ifp->ndev->name, ifp->mac_addr);

        return ifp;
}

void brcmf_del_if(struct brcmf_pub *drvr, s32 bssidx)
{
        struct brcmf_if *ifp;

        ifp = drvr->iflist[bssidx];
        if (!ifp) {
                brcmf_err("Null interface, idx=%d\n", bssidx);
                return;
        }
        brcmf_dbg(TRACE, "Enter, idx=%d, ifidx=%d\n", bssidx, ifp->ifidx);
        if (ifp->ndev) {
                if (bssidx == 0) {
                        if (ifp->ndev->netdev_ops == &brcmf_netdev_ops_pri) {
                                rtnl_lock();
                                brcmf_netdev_stop(ifp->ndev);
                                rtnl_unlock();
                        }
                } else {
                        netif_stop_queue(ifp->ndev);
                }

                if (ifp->ndev->netdev_ops == &brcmf_netdev_ops_pri) {
                        cancel_work_sync(&ifp->setmacaddr_work);
                        cancel_work_sync(&ifp->multicast_work);
                }

                unregister_netdev(ifp->ndev);
                drvr->iflist[bssidx] = NULL;
                if (bssidx == 0)
                        brcmf_cfg80211_detach(drvr->config);
                free_netdev(ifp->ndev);
        }
}

int brcmf_attach(uint bus_hdrlen, struct device *dev)
{
        struct brcmf_pub *drvr = NULL;
        int ret = 0;

        brcmf_dbg(TRACE, "Enter\n");

        /* Allocate primary brcmf_info */
        drvr = kzalloc(sizeof(struct brcmf_pub), GFP_ATOMIC);
        if (!drvr)
                return -ENOMEM;

        mutex_init(&drvr->proto_block);

        /* Link to bus module */
        drvr->hdrlen = bus_hdrlen;
        drvr->bus_if = dev_get_drvdata(dev);
        drvr->bus_if->drvr = drvr;

        /* create device debugfs folder */
        brcmf_debugfs_attach(drvr);

        /* Attach and link in the protocol */
        ret = brcmf_proto_attach(drvr);
        if (ret != 0) {
                brcmf_err("brcmf_prot_attach failed\n");
                goto fail;
        }

        /* attach firmware event handler */
        brcmf_fweh_attach(drvr);

        INIT_LIST_HEAD(&drvr->bus_if->dcmd_list);

        return ret;

fail:
        brcmf_detach(dev);

        return ret;
}

int brcmf_bus_start(struct device *dev)
{
        int ret = -1;
        struct brcmf_bus *bus_if = dev_get_drvdata(dev);
        struct brcmf_pub *drvr = bus_if->drvr;
        struct brcmf_if *ifp;
        struct brcmf_if *p2p_ifp;

        brcmf_dbg(TRACE, "\n");

        /* Bring up the bus */
        ret = brcmf_bus_init(bus_if);
        if (ret != 0) {
                brcmf_err("brcmf_sdbrcm_bus_init failed %d\n", ret);
                return ret;
        }

        /* add primary networking interface */
        ifp = brcmf_add_if(drvr, 0, 0, "wlan%d", NULL);
        if (IS_ERR(ifp))
                return PTR_ERR(ifp);

        if (brcmf_p2p_enable)
                p2p_ifp = brcmf_add_if(drvr, 1, 0, "p2p%d", NULL);
        else
                p2p_ifp = NULL;
        if (IS_ERR(p2p_ifp))
                p2p_ifp = NULL;

        /* signal bus ready */
        bus_if->state = BRCMF_BUS_DATA;

        /* Bus is ready, do any initialization */
        ret = brcmf_c_preinit_dcmds(ifp);
        if (ret < 0)
                goto fail;

        drvr->fw_signals = true;
        (void)brcmf_fws_init(drvr);

        drvr->config = brcmf_cfg80211_attach(drvr, bus_if->dev);
        if (drvr->config == NULL) {
                ret = -ENOMEM;
                goto fail;
        }

        ret = brcmf_fweh_activate_events(ifp);
        if (ret < 0)
                goto fail;

        ret = brcmf_net_attach(ifp, false);
fail:
        if (ret < 0) {
                brcmf_err("failed: %d\n", ret);
                if (drvr->config)
                        brcmf_cfg80211_detach(drvr->config);
                if (drvr->fws)
                        brcmf_fws_deinit(drvr);
                free_netdev(ifp->ndev);
                drvr->iflist[0] = NULL;
                if (p2p_ifp) {
                        free_netdev(p2p_ifp->ndev);
                        drvr->iflist[1] = NULL;
                }
                return ret;
        }
        if ((brcmf_p2p_enable) && (p2p_ifp))
                brcmf_net_p2p_attach(p2p_ifp);

        return 0;
}

static void brcmf_bus_detach(struct brcmf_pub *drvr)
{
        brcmf_dbg(TRACE, "Enter\n");

        if (drvr) {
                /* Stop the protocol module */
                brcmf_proto_stop(drvr);

                /* Stop the bus module */
                brcmf_bus_stop(drvr->bus_if);
        }
}

void brcmf_dev_reset(struct device *dev)
{
        struct brcmf_bus *bus_if = dev_get_drvdata(dev);
        struct brcmf_pub *drvr = bus_if->drvr;

        if (drvr == NULL)
                return;

        if (drvr->iflist[0])
                brcmf_fil_cmd_int_set(drvr->iflist[0], BRCMF_C_TERMINATED, 1);
}

void brcmf_detach(struct device *dev)
{
        s32 i;
        struct brcmf_bus *bus_if = dev_get_drvdata(dev);
        struct brcmf_pub *drvr = bus_if->drvr;

        brcmf_dbg(TRACE, "Enter\n");

        if (drvr == NULL)
                return;

        /* stop firmware event handling */
        brcmf_fweh_detach(drvr);

        /* make sure primary interface removed last */
        for (i = BRCMF_MAX_IFS-1; i > -1; i--)
                if (drvr->iflist[i])
                        brcmf_del_if(drvr, i);

        brcmf_bus_detach(drvr);

        if (drvr->prot)
                brcmf_proto_detach(drvr);

        if (drvr->fws)
                brcmf_fws_deinit(drvr);

        brcmf_debugfs_detach(drvr);
        bus_if->drvr = NULL;
        kfree(drvr);
}

static int brcmf_get_pend_8021x_cnt(struct brcmf_if *ifp)
{
        return atomic_read(&ifp->pend_8021x_cnt);
}

int brcmf_netdev_wait_pend8021x(struct net_device *ndev)
{
        struct brcmf_if *ifp = netdev_priv(ndev);
        int err;

        err = wait_event_timeout(ifp->pend_8021x_wait,
                                 !brcmf_get_pend_8021x_cnt(ifp),
                                 msecs_to_jiffies(MAX_WAIT_FOR_8021X_TX));

        WARN_ON(!err);

        return !err;
}

/*
 * return chip id and rev of the device encoded in u32.
 */
u32 brcmf_get_chip_info(struct brcmf_if *ifp)
{
        struct brcmf_bus *bus = ifp->drvr->bus_if;

        return bus->chip << 4 | bus->chiprev;
}

static void brcmf_driver_init(struct work_struct *work)
{
        brcmf_debugfs_init();

#ifdef CONFIG_BRCMFMAC_SDIO
        brcmf_sdio_init();
#endif
#ifdef CONFIG_BRCMFMAC_USB
        brcmf_usb_init();
#endif
}
static DECLARE_WORK(brcmf_driver_work, brcmf_driver_init);

static int __init brcmfmac_module_init(void)
{
        if (!schedule_work(&brcmf_driver_work))
                return -EBUSY;

        return 0;
}

static void __exit brcmfmac_module_exit(void)
{
        cancel_work_sync(&brcmf_driver_work);

#ifdef CONFIG_BRCMFMAC_SDIO
        brcmf_sdio_exit();
#endif
#ifdef CONFIG_BRCMFMAC_USB
        brcmf_usb_exit();
#endif
        brcmf_debugfs_exit();
}

module_init(brcmfmac_module_init);
module_exit(brcmfmac_module_exit);