447 lines
11 KiB
C
447 lines
11 KiB
C
/*
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* Copyright (c) 2012 Broadcom Corporation
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <linux/netdevice.h>
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#include "brcmu_wifi.h"
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#include "brcmu_utils.h"
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#include "dhd.h"
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#include "dhd_dbg.h"
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#include "fweh.h"
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#include "fwil.h"
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/**
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* struct brcm_ethhdr - broadcom specific ether header.
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*
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* @subtype: subtype for this packet.
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* @length: TODO: length of appended data.
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* @version: version indication.
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* @oui: OUI of this packet.
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* @usr_subtype: subtype for this OUI.
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*/
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struct brcm_ethhdr {
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__be16 subtype;
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__be16 length;
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u8 version;
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u8 oui[3];
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__be16 usr_subtype;
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} __packed;
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struct brcmf_event_msg_be {
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__be16 version;
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__be16 flags;
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__be32 event_type;
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__be32 status;
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__be32 reason;
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__be32 auth_type;
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__be32 datalen;
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u8 addr[ETH_ALEN];
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char ifname[IFNAMSIZ];
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u8 ifidx;
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u8 bsscfgidx;
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} __packed;
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/**
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* struct brcmf_event - contents of broadcom event packet.
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*
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* @eth: standard ether header.
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* @hdr: broadcom specific ether header.
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* @msg: common part of the actual event message.
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*/
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struct brcmf_event {
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struct ethhdr eth;
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struct brcm_ethhdr hdr;
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struct brcmf_event_msg_be msg;
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} __packed;
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/**
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* struct brcmf_fweh_queue_item - event item on event queue.
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*
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* @q: list element for queuing.
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* @code: event code.
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* @ifidx: interface index related to this event.
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* @ifaddr: ethernet address for interface.
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* @emsg: common parameters of the firmware event message.
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* @data: event specific data part of the firmware event.
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*/
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struct brcmf_fweh_queue_item {
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struct list_head q;
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enum brcmf_fweh_event_code code;
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u8 ifidx;
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u8 ifaddr[ETH_ALEN];
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struct brcmf_event_msg_be emsg;
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u8 data[0];
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};
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/**
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* struct brcmf_fweh_event_name - code, name mapping entry.
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*/
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struct brcmf_fweh_event_name {
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enum brcmf_fweh_event_code code;
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const char *name;
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};
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#ifdef DEBUG
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#define BRCMF_ENUM_DEF(id, val) \
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{ val, #id },
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/* array for mapping code to event name */
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static struct brcmf_fweh_event_name fweh_event_names[] = {
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BRCMF_FWEH_EVENT_ENUM_DEFLIST
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};
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#undef BRCMF_ENUM_DEF
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/**
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* brcmf_fweh_event_name() - returns name for given event code.
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*
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* @code: code to lookup.
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*/
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static const char *brcmf_fweh_event_name(enum brcmf_fweh_event_code code)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(fweh_event_names); i++) {
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if (fweh_event_names[i].code == code)
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return fweh_event_names[i].name;
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}
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return "unknown";
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}
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#else
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static const char *brcmf_fweh_event_name(enum brcmf_fweh_event_code code)
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{
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return "nodebug";
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}
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#endif
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/**
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* brcmf_fweh_queue_event() - create and queue event.
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*
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* @fweh: firmware event handling info.
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* @event: event queue entry.
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*/
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static void brcmf_fweh_queue_event(struct brcmf_fweh_info *fweh,
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struct brcmf_fweh_queue_item *event)
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{
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ulong flags;
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spin_lock_irqsave(&fweh->evt_q_lock, flags);
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list_add_tail(&event->q, &fweh->event_q);
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spin_unlock_irqrestore(&fweh->evt_q_lock, flags);
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schedule_work(&fweh->event_work);
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}
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static int brcmf_fweh_call_event_handler(struct brcmf_if *ifp,
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enum brcmf_fweh_event_code code,
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struct brcmf_event_msg *emsg,
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void *data)
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{
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struct brcmf_fweh_info *fweh;
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int err = -EINVAL;
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if (ifp) {
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fweh = &ifp->drvr->fweh;
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/* handle the event if valid interface and handler */
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if (ifp->ndev && fweh->evt_handler[code])
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err = fweh->evt_handler[code](ifp, emsg, data);
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else
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brcmf_err("unhandled event %d ignored\n", code);
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} else {
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brcmf_err("no interface object\n");
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}
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return err;
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}
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/**
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* brcmf_fweh_handle_if_event() - handle IF event.
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*
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* @drvr: driver information object.
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* @item: queue entry.
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* @ifpp: interface object (may change upon ADD action).
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*/
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static void brcmf_fweh_handle_if_event(struct brcmf_pub *drvr,
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struct brcmf_event_msg *emsg,
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void *data)
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{
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struct brcmf_if_event *ifevent = data;
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struct brcmf_if *ifp;
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int err = 0;
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brcmf_dbg(EVENT, "action: %u idx: %u bsscfg: %u flags: %u\n",
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ifevent->action, ifevent->ifidx,
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ifevent->bssidx, ifevent->flags);
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if (ifevent->ifidx >= BRCMF_MAX_IFS) {
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brcmf_err("invalid interface index: %u\n",
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ifevent->ifidx);
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return;
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}
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ifp = drvr->iflist[ifevent->bssidx];
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if (ifevent->action == BRCMF_E_IF_ADD) {
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brcmf_dbg(EVENT, "adding %s (%pM)\n", emsg->ifname,
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emsg->addr);
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ifp = brcmf_add_if(drvr, ifevent->bssidx, ifevent->ifidx,
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emsg->ifname, emsg->addr);
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if (IS_ERR(ifp))
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return;
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if (!drvr->fweh.evt_handler[BRCMF_E_IF])
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err = brcmf_net_attach(ifp, false);
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}
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err = brcmf_fweh_call_event_handler(ifp, emsg->event_code, emsg, data);
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if (ifevent->action == BRCMF_E_IF_DEL)
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brcmf_del_if(drvr, ifevent->bssidx);
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}
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/**
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* brcmf_fweh_dequeue_event() - get event from the queue.
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*
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* @fweh: firmware event handling info.
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*/
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static struct brcmf_fweh_queue_item *
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brcmf_fweh_dequeue_event(struct brcmf_fweh_info *fweh)
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{
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struct brcmf_fweh_queue_item *event = NULL;
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ulong flags;
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spin_lock_irqsave(&fweh->evt_q_lock, flags);
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if (!list_empty(&fweh->event_q)) {
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event = list_first_entry(&fweh->event_q,
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struct brcmf_fweh_queue_item, q);
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list_del(&event->q);
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}
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spin_unlock_irqrestore(&fweh->evt_q_lock, flags);
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return event;
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}
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/**
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* brcmf_fweh_event_worker() - firmware event worker.
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*
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* @work: worker object.
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*/
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static void brcmf_fweh_event_worker(struct work_struct *work)
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{
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struct brcmf_pub *drvr;
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struct brcmf_if *ifp;
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struct brcmf_fweh_info *fweh;
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struct brcmf_fweh_queue_item *event;
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int err = 0;
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struct brcmf_event_msg_be *emsg_be;
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struct brcmf_event_msg emsg;
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fweh = container_of(work, struct brcmf_fweh_info, event_work);
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drvr = container_of(fweh, struct brcmf_pub, fweh);
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while ((event = brcmf_fweh_dequeue_event(fweh))) {
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brcmf_dbg(EVENT, "event %s (%u) ifidx %u bsscfg %u addr %pM\n",
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brcmf_fweh_event_name(event->code), event->code,
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event->emsg.ifidx, event->emsg.bsscfgidx,
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event->emsg.addr);
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/* convert event message */
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emsg_be = &event->emsg;
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emsg.version = be16_to_cpu(emsg_be->version);
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emsg.flags = be16_to_cpu(emsg_be->flags);
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emsg.event_code = event->code;
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emsg.status = be32_to_cpu(emsg_be->status);
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emsg.reason = be32_to_cpu(emsg_be->reason);
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emsg.auth_type = be32_to_cpu(emsg_be->auth_type);
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emsg.datalen = be32_to_cpu(emsg_be->datalen);
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memcpy(emsg.addr, emsg_be->addr, ETH_ALEN);
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memcpy(emsg.ifname, emsg_be->ifname, sizeof(emsg.ifname));
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emsg.ifidx = emsg_be->ifidx;
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emsg.bsscfgidx = emsg_be->bsscfgidx;
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brcmf_dbg(EVENT, " version %u flags %u status %u reason %u\n",
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emsg.version, emsg.flags, emsg.status, emsg.reason);
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brcmf_dbg_hex_dump(BRCMF_EVENT_ON(), event->data,
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min_t(u32, emsg.datalen, 64),
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"event payload, len=%d\n", emsg.datalen);
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/* special handling of interface event */
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if (event->code == BRCMF_E_IF) {
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brcmf_fweh_handle_if_event(drvr, &emsg, event->data);
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goto event_free;
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}
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ifp = drvr->iflist[emsg.bsscfgidx];
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err = brcmf_fweh_call_event_handler(ifp, event->code, &emsg,
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event->data);
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if (err) {
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brcmf_err("event handler failed (%d)\n",
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event->code);
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err = 0;
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}
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event_free:
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kfree(event);
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}
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}
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/**
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* brcmf_fweh_attach() - initialize firmware event handling.
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*
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* @drvr: driver information object.
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*/
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void brcmf_fweh_attach(struct brcmf_pub *drvr)
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{
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struct brcmf_fweh_info *fweh = &drvr->fweh;
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INIT_WORK(&fweh->event_work, brcmf_fweh_event_worker);
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spin_lock_init(&fweh->evt_q_lock);
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INIT_LIST_HEAD(&fweh->event_q);
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}
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/**
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* brcmf_fweh_detach() - cleanup firmware event handling.
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*
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* @drvr: driver information object.
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*/
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void brcmf_fweh_detach(struct brcmf_pub *drvr)
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{
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struct brcmf_fweh_info *fweh = &drvr->fweh;
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struct brcmf_if *ifp = drvr->iflist[0];
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s8 eventmask[BRCMF_EVENTING_MASK_LEN];
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if (ifp) {
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/* clear all events */
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memset(eventmask, 0, BRCMF_EVENTING_MASK_LEN);
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(void)brcmf_fil_iovar_data_set(ifp, "event_msgs",
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eventmask,
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BRCMF_EVENTING_MASK_LEN);
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}
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/* cancel the worker */
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cancel_work_sync(&fweh->event_work);
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WARN_ON(!list_empty(&fweh->event_q));
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memset(fweh->evt_handler, 0, sizeof(fweh->evt_handler));
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}
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/**
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* brcmf_fweh_register() - register handler for given event code.
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*
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* @drvr: driver information object.
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* @code: event code.
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* @handler: handler for the given event code.
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*/
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int brcmf_fweh_register(struct brcmf_pub *drvr, enum brcmf_fweh_event_code code,
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brcmf_fweh_handler_t handler)
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{
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if (drvr->fweh.evt_handler[code]) {
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brcmf_err("event code %d already registered\n", code);
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return -ENOSPC;
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}
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drvr->fweh.evt_handler[code] = handler;
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brcmf_dbg(TRACE, "event handler registered for %s\n",
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brcmf_fweh_event_name(code));
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return 0;
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}
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/**
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* brcmf_fweh_unregister() - remove handler for given code.
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*
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* @drvr: driver information object.
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* @code: event code.
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*/
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void brcmf_fweh_unregister(struct brcmf_pub *drvr,
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enum brcmf_fweh_event_code code)
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{
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brcmf_dbg(TRACE, "event handler cleared for %s\n",
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brcmf_fweh_event_name(code));
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drvr->fweh.evt_handler[code] = NULL;
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}
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/**
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* brcmf_fweh_activate_events() - enables firmware events registered.
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*
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* @ifp: primary interface object.
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*/
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int brcmf_fweh_activate_events(struct brcmf_if *ifp)
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{
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int i, err;
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s8 eventmask[BRCMF_EVENTING_MASK_LEN];
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for (i = 0; i < BRCMF_E_LAST; i++) {
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if (ifp->drvr->fweh.evt_handler[i]) {
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brcmf_dbg(EVENT, "enable event %s\n",
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brcmf_fweh_event_name(i));
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setbit(eventmask, i);
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}
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}
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/* want to handle IF event as well */
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brcmf_dbg(EVENT, "enable event IF\n");
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setbit(eventmask, BRCMF_E_IF);
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err = brcmf_fil_iovar_data_set(ifp, "event_msgs",
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eventmask, BRCMF_EVENTING_MASK_LEN);
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if (err)
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brcmf_err("Set event_msgs error (%d)\n", err);
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return err;
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}
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/**
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* brcmf_fweh_process_event() - process skb as firmware event.
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*
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* @drvr: driver information object.
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* @event_packet: event packet to process.
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* @ifidx: index of the firmware interface (may change).
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*
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* If the packet buffer contains a firmware event message it will
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* dispatch the event to a registered handler (using worker).
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*/
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void brcmf_fweh_process_event(struct brcmf_pub *drvr,
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struct brcmf_event *event_packet, u8 *ifidx)
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{
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enum brcmf_fweh_event_code code;
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struct brcmf_fweh_info *fweh = &drvr->fweh;
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struct brcmf_fweh_queue_item *event;
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gfp_t alloc_flag = GFP_KERNEL;
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void *data;
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u32 datalen;
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/* get event info */
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code = get_unaligned_be32(&event_packet->msg.event_type);
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datalen = get_unaligned_be32(&event_packet->msg.datalen);
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*ifidx = event_packet->msg.ifidx;
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data = &event_packet[1];
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if (code >= BRCMF_E_LAST)
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return;
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if (code != BRCMF_E_IF && !fweh->evt_handler[code])
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return;
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if (in_interrupt())
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alloc_flag = GFP_ATOMIC;
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event = kzalloc(sizeof(*event) + datalen, alloc_flag);
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if (!event)
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return;
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event->code = code;
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event->ifidx = *ifidx;
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/* use memcpy to get aligned event message */
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memcpy(&event->emsg, &event_packet->msg, sizeof(event->emsg));
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memcpy(event->data, data, datalen);
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memcpy(event->ifaddr, event_packet->eth.h_dest, ETH_ALEN);
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brcmf_fweh_queue_event(fweh, event);
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}
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