linux/drivers/staging/brcm80211/brcmfmac/dhd_cdc.c - nest-guard/1.0/linux - Git at Google

 /*
  * 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/types.h>
 #include <bcmdefs.h>
 #include <osl.h>

 #include <bcmutils.h>
 #include <bcmcdc.h>
 #include <bcmendian.h>

 #include <dngl_stats.h>
 #include <dhd.h>
 #include <dhd_proto.h>
 #include <dhd_bus.h>
 #include <dhd_dbg.h>
 #ifdef CUSTOMER_HW2
 int wifi_get_mac_addr(unsigned char *buf);
 #endif

 extern int dhd_preinit_ioctls(dhd_pub_t *dhd);

 /* Packet alignment for most efficient SDIO (can change based on platform) */
 #ifndef DHD_SDALIGN
 #define DHD_SDALIGN	32
 #endif
 #if !ISPOWEROF2(DHD_SDALIGN)
 #error DHD_SDALIGN is not a power of 2!
 #endif

 #define RETRIES 2	/* # of retries to retrieve matching ioctl response */
 #define BUS_HEADER_LEN	(16+DHD_SDALIGN) /* Must be atleast SDPCM_RESERVE
 					 * defined in dhd_sdio.c
 					 * (amount of header tha might be added)
 					 * plus any space that might be needed
 					 * for alignment padding.
 					 */
 #define ROUND_UP_MARGIN	2048	/* Biggest SDIO block size possible for
 				 * round off at the end of buffer
 				 */

 typedef struct dhd_prot {
 	u16 reqid;
 	u8 pending;
 	u32 lastcmd;
 	u8 bus_header[BUS_HEADER_LEN];
 	cdc_ioctl_t msg;
 	unsigned char buf[WLC_IOCTL_MAXLEN + ROUND_UP_MARGIN];
 } dhd_prot_t;

 static int dhdcdc_msg(dhd_pub_t *dhd)
 {
 	dhd_prot_t *prot = dhd->prot;
 	int len = ltoh32(prot->msg.len) + sizeof(cdc_ioctl_t);

 	DHD_TRACE(("%s: Enter\n", __func__));

 	/* NOTE : cdc->msg.len holds the desired length of the buffer to be
 	 *        returned. Only up to CDC_MAX_MSG_SIZE of this buffer area
 	 *        is actually sent to the dongle
 	 */
 	if (len > CDC_MAX_MSG_SIZE)
 		len = CDC_MAX_MSG_SIZE;

 	/* Send request */
 	return dhd_bus_txctl(dhd->bus, (unsigned char *)&prot->msg, len);
 }

 static int dhdcdc_cmplt(dhd_pub_t *dhd, u32 id, u32 len)
 {
 	int ret;
 	dhd_prot_t *prot = dhd->prot;

 	DHD_TRACE(("%s: Enter\n", __func__));

 	do {
 		ret =
 		    dhd_bus_rxctl(dhd->bus, (unsigned char *)&prot->msg,
 				  len + sizeof(cdc_ioctl_t));
 		if (ret < 0)
 			break;
 	} while (CDC_IOC_ID(ltoh32(prot->msg.flags)) != id);

 	return ret;
 }

 int
 dhdcdc_query_ioctl(dhd_pub_t *dhd, int ifidx, uint cmd, void *buf, uint len)
 {
 	dhd_prot_t *prot = dhd->prot;
 	cdc_ioctl_t *msg = &prot->msg;
 	void *info;
 	int ret = 0, retries = 0;
 	u32 id, flags = 0;

 	DHD_TRACE(("%s: Enter\n", __func__));
 	DHD_CTL(("%s: cmd %d len %d\n", __func__, cmd, len));

 	/* Respond "bcmerror" and "bcmerrorstr" with local cache */
 	if (cmd == WLC_GET_VAR && buf) {
 		if (!strcmp((char *)buf, "bcmerrorstr")) {
 			strncpy((char *)buf, bcmerrorstr(dhd->dongle_error),
 				BCME_STRLEN);
 			goto done;
 		} else if (!strcmp((char *)buf, "bcmerror")) {
 			*(int *)buf = dhd->dongle_error;
 			goto done;
 		}
 	}

 	memset(msg, 0, sizeof(cdc_ioctl_t));

 	msg->cmd = htol32(cmd);
 	msg->len = htol32(len);
 	msg->flags = (++prot->reqid << CDCF_IOC_ID_SHIFT);
 	CDC_SET_IF_IDX(msg, ifidx);
 	msg->flags = htol32(msg->flags);

 	if (buf)
 		memcpy(prot->buf, buf, len);

 	ret = dhdcdc_msg(dhd);
 	if (ret < 0) {
 		DHD_ERROR(("dhdcdc_query_ioctl: dhdcdc_msg failed w/status "
 			"%d\n", ret));
 		goto done;
 	}

 retry:
 	/* wait for interrupt and get first fragment */
 	ret = dhdcdc_cmplt(dhd, prot->reqid, len);
 	if (ret < 0)
 		goto done;

 	flags = ltoh32(msg->flags);
 	id = (flags & CDCF_IOC_ID_MASK) >> CDCF_IOC_ID_SHIFT;

 	if ((id < prot->reqid) && (++retries < RETRIES))
 		goto retry;
 	if (id != prot->reqid) {
 		DHD_ERROR(("%s: %s: unexpected request id %d (expected %d)\n",
 			   dhd_ifname(dhd, ifidx), __func__, id, prot->reqid));
 		ret = -EINVAL;
 		goto done;
 	}

 	/* Check info buffer */
 	info = (void *)&msg[1];

 	/* Copy info buffer */
 	if (buf) {
 		if (ret < (int)len)
 			len = ret;
 		memcpy(buf, info, len);
 	}

 	/* Check the ERROR flag */
 	if (flags & CDCF_IOC_ERROR) {
 		ret = ltoh32(msg->status);
 		/* Cache error from dongle */
 		dhd->dongle_error = ret;
 	}

 done:
 	return ret;
 }

 int dhdcdc_set_ioctl(dhd_pub_t *dhd, int ifidx, uint cmd, void *buf, uint len)
 {
 	dhd_prot_t *prot = dhd->prot;
 	cdc_ioctl_t *msg = &prot->msg;
 	int ret = 0;
 	u32 flags, id;

 	DHD_TRACE(("%s: Enter\n", __func__));
 	DHD_CTL(("%s: cmd %d len %d\n", __func__, cmd, len));

 	memset(msg, 0, sizeof(cdc_ioctl_t));

 	msg->cmd = htol32(cmd);
 	msg->len = htol32(len);
 	msg->flags = (++prot->reqid << CDCF_IOC_ID_SHIFT) | CDCF_IOC_SET;
 	CDC_SET_IF_IDX(msg, ifidx);
 	msg->flags = htol32(msg->flags);

 	if (buf)
 		memcpy(prot->buf, buf, len);

 	ret = dhdcdc_msg(dhd);
 	if (ret < 0)
 		goto done;

 	ret = dhdcdc_cmplt(dhd, prot->reqid, len);
 	if (ret < 0)
 		goto done;

 	flags = ltoh32(msg->flags);
 	id = (flags & CDCF_IOC_ID_MASK) >> CDCF_IOC_ID_SHIFT;

 	if (id != prot->reqid) {
 		DHD_ERROR(("%s: %s: unexpected request id %d (expected %d)\n",
 			   dhd_ifname(dhd, ifidx), __func__, id, prot->reqid));
 		ret = -EINVAL;
 		goto done;
 	}

 	/* Check the ERROR flag */
 	if (flags & CDCF_IOC_ERROR) {
 		ret = ltoh32(msg->status);
 		/* Cache error from dongle */
 		dhd->dongle_error = ret;
 	}

 done:
 	return ret;
 }

 extern int dhd_bus_interface(struct dhd_bus *bus, uint arg, void *arg2);
 int
 dhd_prot_ioctl(dhd_pub_t *dhd, int ifidx, wl_ioctl_t *ioc, void *buf, int len)
 {
 	dhd_prot_t *prot = dhd->prot;
 	int ret = -1;

 	if (dhd->busstate == DHD_BUS_DOWN) {
 		DHD_ERROR(("%s : bus is down. we have nothing to do\n",
 			   __func__));
 		return ret;
 	}
 	dhd_os_proto_block(dhd);

 	DHD_TRACE(("%s: Enter\n", __func__));

 	ASSERT(len <= WLC_IOCTL_MAXLEN);

 	if (len > WLC_IOCTL_MAXLEN)
 		goto done;

 	if (prot->pending == true) {
 		DHD_TRACE(("CDC packet is pending!!!! cmd=0x%x (%lu) "
 			"lastcmd=0x%x (%lu)\n",
 			ioc->cmd, (unsigned long)ioc->cmd, prot->lastcmd,
 			(unsigned long)prot->lastcmd));
 		if ((ioc->cmd == WLC_SET_VAR) || (ioc->cmd == WLC_GET_VAR)) {
 			DHD_TRACE(("iovar cmd=%s\n", (char *)buf));
 		}
 		goto done;
 	}

 	prot->pending = true;
 	prot->lastcmd = ioc->cmd;
 	if (ioc->set)
 		ret = dhdcdc_set_ioctl(dhd, ifidx, ioc->cmd, buf, len);
 	else {
 		ret = dhdcdc_query_ioctl(dhd, ifidx, ioc->cmd, buf, len);
 		if (ret > 0)
 			ioc->used = ret - sizeof(cdc_ioctl_t);
 	}

 	/* Too many programs assume ioctl() returns 0 on success */
 	if (ret >= 0)
 		ret = 0;
 	else {
 		cdc_ioctl_t *msg = &prot->msg;
 		ioc->needed = ltoh32(msg->len);	/* len == needed when set/query
 						 fails from dongle */
 	}

 	/* Intercept the wme_dp ioctl here */
 	if ((!ret) && (ioc->cmd == WLC_SET_VAR) && (!strcmp(buf, "wme_dp"))) {
 		int slen, val = 0;

 		slen = strlen("wme_dp") + 1;
 		if (len >= (int)(slen + sizeof(int)))
 			bcopy(((char *)buf + slen), &val, sizeof(int));
 		dhd->wme_dp = (u8) ltoh32(val);
 	}

 	prot->pending = false;

 done:
 	dhd_os_proto_unblock(dhd);

 	return ret;
 }

 int
 dhd_prot_iovar_op(dhd_pub_t *dhdp, const char *name,
 		  void *params, int plen, void *arg, int len, bool set)
 {
 	return BCME_UNSUPPORTED;
 }

 void dhd_prot_dump(dhd_pub_t *dhdp, struct bcmstrbuf *strbuf)
 {
 	bcm_bprintf(strbuf, "Protocol CDC: reqid %d\n", dhdp->prot->reqid);
 }

 void dhd_prot_hdrpush(dhd_pub_t *dhd, int ifidx, void *pktbuf)
 {
 #ifdef BDC
 	struct bdc_header *h;
 #endif				/* BDC */

 	DHD_TRACE(("%s: Enter\n", __func__));

 #ifdef BDC
 	/* Push BDC header used to convey priority for buses that don't */

 	PKTPUSH(pktbuf, BDC_HEADER_LEN);

 	h = (struct bdc_header *)PKTDATA(pktbuf);

 	h->flags = (BDC_PROTO_VER << BDC_FLAG_VER_SHIFT);
 	if (PKTSUMNEEDED(pktbuf))
 		h->flags |= BDC_FLAG_SUM_NEEDED;

 	h->priority = (PKTPRIO(pktbuf) & BDC_PRIORITY_MASK);
 	h->flags2 = 0;
 	h->rssi = 0;
 #endif				/* BDC */
 	BDC_SET_IF_IDX(h, ifidx);
 }

 bool dhd_proto_fcinfo(dhd_pub_t *dhd, void *pktbuf, u8 * fcbits)
 {
 #ifdef BDC
 	struct bdc_header *h;

 	if (PKTLEN(pktbuf) < BDC_HEADER_LEN) {
 		DHD_ERROR(("%s: rx data too short (%d < %d)\n",
 			   __func__, PKTLEN(pktbuf), BDC_HEADER_LEN));
 		return BCME_ERROR;
 	}

 	h = (struct bdc_header *)PKTDATA(pktbuf);

 	*fcbits = h->priority >> BDC_PRIORITY_FC_SHIFT;
 	if ((h->flags2 & BDC_FLAG2_FC_FLAG) == BDC_FLAG2_FC_FLAG)
 		return true;
 #endif
 	return false;
 }

 int dhd_prot_hdrpull(dhd_pub_t *dhd, int *ifidx, void *pktbuf)
 {
 #ifdef BDC
 	struct bdc_header *h;
 #endif

 	DHD_TRACE(("%s: Enter\n", __func__));

 #ifdef BDC
 	/* Pop BDC header used to convey priority for buses that don't */

 	if (PKTLEN(pktbuf) < BDC_HEADER_LEN) {
 		DHD_ERROR(("%s: rx data too short (%d < %d)\n", __func__,
 			   PKTLEN(pktbuf), BDC_HEADER_LEN));
 		return BCME_ERROR;
 	}

 	h = (struct bdc_header *)PKTDATA(pktbuf);

 	*ifidx = BDC_GET_IF_IDX(h);
 	if (*ifidx >= DHD_MAX_IFS) {
 		DHD_ERROR(("%s: rx data ifnum out of range (%d)\n",
 			   __func__, *ifidx));
 		return BCME_ERROR;
 	}

 	if (((h->flags & BDC_FLAG_VER_MASK) >> BDC_FLAG_VER_SHIFT) !=
 	    BDC_PROTO_VER) {
 		DHD_ERROR(("%s: non-BDC packet received, flags 0x%x\n",
 			   dhd_ifname(dhd, *ifidx), h->flags));
 		return BCME_ERROR;
 	}

 	if (h->flags & BDC_FLAG_SUM_GOOD) {
 		DHD_INFO(("%s: BDC packet received with good rx-csum, "
 			"flags 0x%x\n",
 			dhd_ifname(dhd, *ifidx), h->flags));
 		PKTSETSUMGOOD(pktbuf, true);
 	}

 	PKTSETPRIO(pktbuf, (h->priority & BDC_PRIORITY_MASK));

 	PKTPULL(pktbuf, BDC_HEADER_LEN);
 #endif				/* BDC */

 	return 0;
 }

 int dhd_prot_attach(dhd_pub_t *dhd)
 {
 	dhd_prot_t *cdc;

 	cdc = kzalloc(sizeof(dhd_prot_t), GFP_ATOMIC);
 	if (!cdc) {
 		DHD_ERROR(("%s: kmalloc failed\n", __func__));
 		goto fail;
 	}

 	/* ensure that the msg buf directly follows the cdc msg struct */
 	if ((unsigned long)(&cdc->msg + 1) != (unsigned long)cdc->buf) {
 		DHD_ERROR(("dhd_prot_t is not correctly defined\n"));
 		goto fail;
 	}

 	dhd->prot = cdc;
 #ifdef BDC
 	dhd->hdrlen += BDC_HEADER_LEN;
 #endif
 	dhd->maxctl = WLC_IOCTL_MAXLEN + sizeof(cdc_ioctl_t) + ROUND_UP_MARGIN;
 	return 0;

 fail:
 	if (cdc != NULL)
 		kfree(cdc);
 	return BCME_NOMEM;
 }

 /* ~NOTE~ What if another thread is waiting on the semaphore?  Holding it? */
 void dhd_prot_detach(dhd_pub_t *dhd)
 {
 	kfree(dhd->prot);
 	dhd->prot = NULL;
 }

 void dhd_prot_dstats(dhd_pub_t *dhd)
 {
 	/* No stats from dongle added yet, copy bus stats */
 	dhd->dstats.tx_packets = dhd->tx_packets;
 	dhd->dstats.tx_errors = dhd->tx_errors;
 	dhd->dstats.rx_packets = dhd->rx_packets;
 	dhd->dstats.rx_errors = dhd->rx_errors;
 	dhd->dstats.rx_dropped = dhd->rx_dropped;
 	dhd->dstats.multicast = dhd->rx_multicast;
 	return;
 }

 int dhd_prot_init(dhd_pub_t *dhd)
 {
 	int ret = 0;
 	char buf[128];

 	DHD_TRACE(("%s: Enter\n", __func__));

 	dhd_os_proto_block(dhd);

 	/* Get the device MAC address */
 	strcpy(buf, "cur_etheraddr");
 	ret = dhdcdc_query_ioctl(dhd, 0, WLC_GET_VAR, buf, sizeof(buf));
 	if (ret < 0) {
 		dhd_os_proto_unblock(dhd);
 		return ret;
 	}
 	memcpy(dhd->mac.octet, buf, ETHER_ADDR_LEN);

 	dhd_os_proto_unblock(dhd);

 #ifdef EMBEDDED_PLATFORM
 	ret = dhd_preinit_ioctls(dhd);
 #endif				/* EMBEDDED_PLATFORM */

 	/* Always assumes wl for now */
 	dhd->iswl = true;

 	return ret;
 }

 void dhd_prot_stop(dhd_pub_t *dhd)
 {
 	/* Nothing to do for CDC */
 }
	/*
	* 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/types.h>
	#include <bcmdefs.h>
	#include <osl.h>

	#include <bcmutils.h>
	#include <bcmcdc.h>
	#include <bcmendian.h>

	#include <dngl_stats.h>
	#include <dhd.h>
	#include <dhd_proto.h>
	#include <dhd_bus.h>
	#include <dhd_dbg.h>
	#ifdef CUSTOMER_HW2
	int wifi_get_mac_addr(unsigned char *buf);
	#endif

	extern int dhd_preinit_ioctls(dhd_pub_t *dhd);

	/* Packet alignment for most efficient SDIO (can change based on platform) */
	#ifndef DHD_SDALIGN
	#define DHD_SDALIGN 32
	#endif
	#if !ISPOWEROF2(DHD_SDALIGN)
	#error DHD_SDALIGN is not a power of 2!
	#endif

	#define RETRIES 2 /* # of retries to retrieve matching ioctl response */
	#define BUS_HEADER_LEN (16+DHD_SDALIGN) /* Must be atleast SDPCM_RESERVE
	* defined in dhd_sdio.c
	* (amount of header tha might be added)
	* plus any space that might be needed
	* for alignment padding.
	*/
	#define ROUND_UP_MARGIN 2048 /* Biggest SDIO block size possible for
	* round off at the end of buffer
	*/

	typedef struct dhd_prot {
	u16 reqid;
	u8 pending;
	u32 lastcmd;
	u8 bus_header[BUS_HEADER_LEN];
	cdc_ioctl_t msg;
	unsigned char buf[WLC_IOCTL_MAXLEN + ROUND_UP_MARGIN];
	} dhd_prot_t;

	static int dhdcdc_msg(dhd_pub_t *dhd)
	{
	dhd_prot_t *prot = dhd->prot;
	int len = ltoh32(prot->msg.len) + sizeof(cdc_ioctl_t);

	DHD_TRACE(("%s: Enter\n", __func__));

	/* NOTE : cdc->msg.len holds the desired length of the buffer to be
	* returned. Only up to CDC_MAX_MSG_SIZE of this buffer area
	* is actually sent to the dongle
	*/
	if (len > CDC_MAX_MSG_SIZE)
	len = CDC_MAX_MSG_SIZE;

	/* Send request */
	return dhd_bus_txctl(dhd->bus, (unsigned char *)&prot->msg, len);
	}

	static int dhdcdc_cmplt(dhd_pub_t *dhd, u32 id, u32 len)
	{
	int ret;
	dhd_prot_t *prot = dhd->prot;

	DHD_TRACE(("%s: Enter\n", __func__));

	do {
	ret =
	dhd_bus_rxctl(dhd->bus, (unsigned char *)&prot->msg,
	len + sizeof(cdc_ioctl_t));
	if (ret < 0)
	break;
	} while (CDC_IOC_ID(ltoh32(prot->msg.flags)) != id);

	return ret;
	}

	int
	dhdcdc_query_ioctl(dhd_pub_t dhd, int ifidx, uint cmd, void buf, uint len)
	{
	dhd_prot_t *prot = dhd->prot;
	cdc_ioctl_t *msg = &prot->msg;
	void *info;
	int ret = 0, retries = 0;
	u32 id, flags = 0;

	DHD_TRACE(("%s: Enter\n", __func__));
	DHD_CTL(("%s: cmd %d len %d\n", __func__, cmd, len));

	/* Respond "bcmerror" and "bcmerrorstr" with local cache */
	if (cmd == WLC_GET_VAR && buf) {
	if (!strcmp((char *)buf, "bcmerrorstr")) {
	strncpy((char *)buf, bcmerrorstr(dhd->dongle_error),
	BCME_STRLEN);
	goto done;
	} else if (!strcmp((char *)buf, "bcmerror")) {
	(int )buf = dhd->dongle_error;
	goto done;
	}
	}

	memset(msg, 0, sizeof(cdc_ioctl_t));

	msg->cmd = htol32(cmd);
	msg->len = htol32(len);
	msg->flags = (++prot->reqid << CDCF_IOC_ID_SHIFT);
	CDC_SET_IF_IDX(msg, ifidx);
	msg->flags = htol32(msg->flags);

	if (buf)
	memcpy(prot->buf, buf, len);

	ret = dhdcdc_msg(dhd);
	if (ret < 0) {
	DHD_ERROR(("dhdcdc_query_ioctl: dhdcdc_msg failed w/status "
	"%d\n", ret));
	goto done;
	}

	retry:
	/* wait for interrupt and get first fragment */
	ret = dhdcdc_cmplt(dhd, prot->reqid, len);
	if (ret < 0)
	goto done;

	flags = ltoh32(msg->flags);
	id = (flags & CDCF_IOC_ID_MASK) >> CDCF_IOC_ID_SHIFT;

	if ((id < prot->reqid) && (++retries < RETRIES))
	goto retry;
	if (id != prot->reqid) {
	DHD_ERROR(("%s: %s: unexpected request id %d (expected %d)\n",
	dhd_ifname(dhd, ifidx), __func__, id, prot->reqid));
	ret = -EINVAL;
	goto done;
	}

	/* Check info buffer */
	info = (void *)&msg[1];

	/* Copy info buffer */
	if (buf) {
	if (ret < (int)len)
	len = ret;
	memcpy(buf, info, len);
	}

	/* Check the ERROR flag */
	if (flags & CDCF_IOC_ERROR) {
	ret = ltoh32(msg->status);
	/* Cache error from dongle */
	dhd->dongle_error = ret;
	}

	done:
	return ret;
	}

	int dhdcdc_set_ioctl(dhd_pub_t dhd, int ifidx, uint cmd, void buf, uint len)
	{
	dhd_prot_t *prot = dhd->prot;
	cdc_ioctl_t *msg = &prot->msg;
	int ret = 0;
	u32 flags, id;

	DHD_TRACE(("%s: Enter\n", __func__));
	DHD_CTL(("%s: cmd %d len %d\n", __func__, cmd, len));

	memset(msg, 0, sizeof(cdc_ioctl_t));

	msg->cmd = htol32(cmd);
	msg->len = htol32(len);
	msg->flags = (++prot->reqid << CDCF_IOC_ID_SHIFT) \| CDCF_IOC_SET;
	CDC_SET_IF_IDX(msg, ifidx);
	msg->flags = htol32(msg->flags);

	if (buf)
	memcpy(prot->buf, buf, len);

	ret = dhdcdc_msg(dhd);
	if (ret < 0)
	goto done;

	ret = dhdcdc_cmplt(dhd, prot->reqid, len);
	if (ret < 0)
	goto done;

	flags = ltoh32(msg->flags);
	id = (flags & CDCF_IOC_ID_MASK) >> CDCF_IOC_ID_SHIFT;

	if (id != prot->reqid) {
	DHD_ERROR(("%s: %s: unexpected request id %d (expected %d)\n",
	dhd_ifname(dhd, ifidx), __func__, id, prot->reqid));
	ret = -EINVAL;
	goto done;
	}

	/* Check the ERROR flag */
	if (flags & CDCF_IOC_ERROR) {
	ret = ltoh32(msg->status);
	/* Cache error from dongle */
	dhd->dongle_error = ret;
	}

	done:
	return ret;
	}

	extern int dhd_bus_interface(struct dhd_bus bus, uint arg, void arg2);
	int
	dhd_prot_ioctl(dhd_pub_t dhd, int ifidx, wl_ioctl_t ioc, void *buf, int len)
	{
	dhd_prot_t *prot = dhd->prot;
	int ret = -1;

	if (dhd->busstate == DHD_BUS_DOWN) {
	DHD_ERROR(("%s : bus is down. we have nothing to do\n",
	__func__));
	return ret;
	}
	dhd_os_proto_block(dhd);

	DHD_TRACE(("%s: Enter\n", __func__));

	ASSERT(len <= WLC_IOCTL_MAXLEN);

	if (len > WLC_IOCTL_MAXLEN)
	goto done;

	if (prot->pending == true) {
	DHD_TRACE(("CDC packet is pending!!!! cmd=0x%x (%lu) "
	"lastcmd=0x%x (%lu)\n",
	ioc->cmd, (unsigned long)ioc->cmd, prot->lastcmd,
	(unsigned long)prot->lastcmd));
	if ((ioc->cmd == WLC_SET_VAR) \|\| (ioc->cmd == WLC_GET_VAR)) {
	DHD_TRACE(("iovar cmd=%s\n", (char *)buf));
	}
	goto done;
	}

	prot->pending = true;
	prot->lastcmd = ioc->cmd;
	if (ioc->set)
	ret = dhdcdc_set_ioctl(dhd, ifidx, ioc->cmd, buf, len);
	else {
	ret = dhdcdc_query_ioctl(dhd, ifidx, ioc->cmd, buf, len);
	if (ret > 0)
	ioc->used = ret - sizeof(cdc_ioctl_t);
	}

	/* Too many programs assume ioctl() returns 0 on success */
	if (ret >= 0)
	ret = 0;
	else {
	cdc_ioctl_t *msg = &prot->msg;
	ioc->needed = ltoh32(msg->len); /* len == needed when set/query
	fails from dongle */
	}

	/* Intercept the wme_dp ioctl here */
	if ((!ret) && (ioc->cmd == WLC_SET_VAR) && (!strcmp(buf, "wme_dp"))) {
	int slen, val = 0;

	slen = strlen("wme_dp") + 1;
	if (len >= (int)(slen + sizeof(int)))
	bcopy(((char *)buf + slen), &val, sizeof(int));
	dhd->wme_dp = (u8) ltoh32(val);
	}

	prot->pending = false;

	done:
	dhd_os_proto_unblock(dhd);

	return ret;
	}

	int
	dhd_prot_iovar_op(dhd_pub_t dhdp, const char name,
	void params, int plen, void arg, int len, bool set)
	{
	return BCME_UNSUPPORTED;
	}

	void dhd_prot_dump(dhd_pub_t dhdp, struct bcmstrbuf strbuf)
	{
	bcm_bprintf(strbuf, "Protocol CDC: reqid %d\n", dhdp->prot->reqid);
	}

	void dhd_prot_hdrpush(dhd_pub_t dhd, int ifidx, void pktbuf)
	{
	#ifdef BDC
	struct bdc_header *h;
	#endif /* BDC */

	DHD_TRACE(("%s: Enter\n", __func__));

	#ifdef BDC
	/* Push BDC header used to convey priority for buses that don't */

	PKTPUSH(pktbuf, BDC_HEADER_LEN);

	h = (struct bdc_header *)PKTDATA(pktbuf);

	h->flags = (BDC_PROTO_VER << BDC_FLAG_VER_SHIFT);
	if (PKTSUMNEEDED(pktbuf))
	h->flags \|= BDC_FLAG_SUM_NEEDED;

	h->priority = (PKTPRIO(pktbuf) & BDC_PRIORITY_MASK);
	h->flags2 = 0;
	h->rssi = 0;
	#endif /* BDC */
	BDC_SET_IF_IDX(h, ifidx);
	}

	bool dhd_proto_fcinfo(dhd_pub_t dhd, void pktbuf, u8 * fcbits)
	{
	#ifdef BDC
	struct bdc_header *h;

	if (PKTLEN(pktbuf) < BDC_HEADER_LEN) {
	DHD_ERROR(("%s: rx data too short (%d < %d)\n",
	__func__, PKTLEN(pktbuf), BDC_HEADER_LEN));
	return BCME_ERROR;
	}

	h = (struct bdc_header *)PKTDATA(pktbuf);

	*fcbits = h->priority >> BDC_PRIORITY_FC_SHIFT;
	if ((h->flags2 & BDC_FLAG2_FC_FLAG) == BDC_FLAG2_FC_FLAG)
	return true;
	#endif
	return false;
	}

	int dhd_prot_hdrpull(dhd_pub_t dhd, int ifidx, void *pktbuf)
	{
	#ifdef BDC
	struct bdc_header *h;
	#endif

	DHD_TRACE(("%s: Enter\n", __func__));

	#ifdef BDC
	/* Pop BDC header used to convey priority for buses that don't */

	if (PKTLEN(pktbuf) < BDC_HEADER_LEN) {
	DHD_ERROR(("%s: rx data too short (%d < %d)\n", __func__,
	PKTLEN(pktbuf), BDC_HEADER_LEN));
	return BCME_ERROR;
	}

	h = (struct bdc_header *)PKTDATA(pktbuf);

	*ifidx = BDC_GET_IF_IDX(h);
	if (*ifidx >= DHD_MAX_IFS) {
	DHD_ERROR(("%s: rx data ifnum out of range (%d)\n",
	__func__, *ifidx));
	return BCME_ERROR;
	}

	if (((h->flags & BDC_FLAG_VER_MASK) >> BDC_FLAG_VER_SHIFT) !=
	BDC_PROTO_VER) {
	DHD_ERROR(("%s: non-BDC packet received, flags 0x%x\n",
	dhd_ifname(dhd, *ifidx), h->flags));
	return BCME_ERROR;
	}

	if (h->flags & BDC_FLAG_SUM_GOOD) {
	DHD_INFO(("%s: BDC packet received with good rx-csum, "
	"flags 0x%x\n",
	dhd_ifname(dhd, *ifidx), h->flags));
	PKTSETSUMGOOD(pktbuf, true);
	}

	PKTSETPRIO(pktbuf, (h->priority & BDC_PRIORITY_MASK));

	PKTPULL(pktbuf, BDC_HEADER_LEN);
	#endif /* BDC */

	return 0;
	}

	int dhd_prot_attach(dhd_pub_t *dhd)
	{
	dhd_prot_t *cdc;

	cdc = kzalloc(sizeof(dhd_prot_t), GFP_ATOMIC);
	if (!cdc) {
	DHD_ERROR(("%s: kmalloc failed\n", __func__));
	goto fail;
	}

	/* ensure that the msg buf directly follows the cdc msg struct */
	if ((unsigned long)(&cdc->msg + 1) != (unsigned long)cdc->buf) {
	DHD_ERROR(("dhd_prot_t is not correctly defined\n"));
	goto fail;
	}

	dhd->prot = cdc;
	#ifdef BDC
	dhd->hdrlen += BDC_HEADER_LEN;
	#endif
	dhd->maxctl = WLC_IOCTL_MAXLEN + sizeof(cdc_ioctl_t) + ROUND_UP_MARGIN;
	return 0;

	fail:
	if (cdc != NULL)
	kfree(cdc);
	return BCME_NOMEM;
	}

	/* ~NOTE~ What if another thread is waiting on the semaphore? Holding it? */
	void dhd_prot_detach(dhd_pub_t *dhd)
	{
	kfree(dhd->prot);
	dhd->prot = NULL;
	}

	void dhd_prot_dstats(dhd_pub_t *dhd)
	{
	/* No stats from dongle added yet, copy bus stats */
	dhd->dstats.tx_packets = dhd->tx_packets;
	dhd->dstats.tx_errors = dhd->tx_errors;
	dhd->dstats.rx_packets = dhd->rx_packets;
	dhd->dstats.rx_errors = dhd->rx_errors;
	dhd->dstats.rx_dropped = dhd->rx_dropped;
	dhd->dstats.multicast = dhd->rx_multicast;
	return;
	}

	int dhd_prot_init(dhd_pub_t *dhd)
	{
	int ret = 0;
	char buf[128];

	DHD_TRACE(("%s: Enter\n", __func__));

	dhd_os_proto_block(dhd);

	/* Get the device MAC address */
	strcpy(buf, "cur_etheraddr");
	ret = dhdcdc_query_ioctl(dhd, 0, WLC_GET_VAR, buf, sizeof(buf));
	if (ret < 0) {
	dhd_os_proto_unblock(dhd);
	return ret;
	}
	memcpy(dhd->mac.octet, buf, ETHER_ADDR_LEN);

	dhd_os_proto_unblock(dhd);

	#ifdef EMBEDDED_PLATFORM
	ret = dhd_preinit_ioctls(dhd);
	#endif /* EMBEDDED_PLATFORM */

	/* Always assumes wl for now */
	dhd->iswl = true;

	return ret;
	}

	void dhd_prot_stop(dhd_pub_t *dhd)
	{
	/* Nothing to do for CDC */
	}