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      1 /*
      2  * ipc_k.c
      3  *
      4  * Copyright(c) 1998 - 2009 Texas Instruments. All rights reserved.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  *
     11  *  * Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  *  * Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in
     15  *    the documentation and/or other materials provided with the
     16  *    distribution.
     17  *  * Neither the name Texas Instruments nor the names of its
     18  *    contributors may be used to endorse or promote products derived
     19  *    from this software without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     22  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     24  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     25  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     27  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     31  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 
     35 /*
     36  * src/ipc_k.c
     37  *
     38  */
     39 
     40 #include <linux/module.h>
     41 #include <linux/kernel.h>
     42 #include <linux/stddef.h>
     43 #include <linux/netdevice.h>
     44 #include <linux/rtnetlink.h>
     45 #include <linux/netlink.h>
     46 
     47 #include "tidef.h"
     48 #include "WlanDrvIf.h"
     49 #include "osApi.h"
     50 #include "ioctl_init.h"
     51 #include "cli_cu_common.h"
     52 #include "TI_IPC_Api.h"
     53 
     54 TI_UINT32 IPCKernelInit    (TI_HANDLE hAdapter,TI_HANDLE  hIPCEv)
     55 {
     56     return 0;
     57 }
     58 
     59 TI_UINT32 IPCKernelDeInit  (TI_HANDLE hAdapter)
     60 {
     61     return 0;
     62 }
     63 
     64 
     65 /*******************************************************/
     66 TI_INT32 IPC_EventSend(TI_HANDLE hAdapter, TI_UINT8* pEvData, TI_UINT32 EvDataSize)
     67 {
     68 	struct sk_buff *skb;
     69 	int res;
     70 	TWlanDrvIfObj *drv = (TWlanDrvIfObj *) hAdapter;
     71 	TI_UINT32 realSize = 0;
     72 	TI_UINT32 msgSize;
     73 	struct nlmsghdr *nlh;
     74 	TI_UINT8 *msg;
     75 
     76 	os_wake_lock_timeout_enable(drv);
     77 	/* This event is targetted to the OS process Id 0 is not a valid pId for LINUX*/
     78 	if (((IPC_EVENT_PARAMS *)pEvData)->uProcessID == 0)
     79 	{
     80 		((IPC_EVENT_PARAMS *)pEvData)->pfEventCallback(( IPC_EV_DATA *)pEvData);
     81 		return 0;
     82 	}
     83 
     84 	/* set the payload size */
     85 	msgSize = (( IPC_EV_DATA *) pEvData) ->uBufferSize + offsetof(IPC_EV_DATA,uBuffer);
     86 
     87 	/* add the netlink header size */
     88 	realSize = NLMSG_SPACE(msgSize);
     89 
     90 	/* allocate the complete message */
     91 	skb = dev_alloc_skb(realSize);
     92 	if (!skb) {
     93 		printk(KERN_ERR "Failed to allocate new skb with size=%u.\n",realSize);
     94 		return -1;
     95 	}
     96 
     97 	/* set the netlink header params */
     98 	nlh = NLMSG_PUT(skb, 0, 0, NLMSG_DONE, realSize - sizeof(*nlh));
     99 
    100 	/* get the payload pointer */
    101 	msg = (char *)NLMSG_DATA(nlh);
    102 
    103 	/* copy the data to the payload */
    104 	memcpy(msg,pEvData,msgSize);
    105 
    106 	NETLINK_CB(skb).pid = 0;   /* from kernel */
    107 #define RTMGRP_LINK 1
    108 	NETLINK_CB(skb).dst_group = RTMGRP_LINK;
    109 
    110 	/* send the message*/
    111 	res = netlink_unicast(drv->wl_sock, skb, (( IPC_EVENT_PARAMS *) pEvData) ->uProcessID, MSG_DONTWAIT);
    112 
    113 	/* Sanity checks. As far as we're concerned this error is unrecovarable.*/
    114 	if (res >= 0)
    115 	{
    116 		return 0;
    117 	}
    118 
    119 nlmsg_failure:
    120 	ti_dprintf(TIWLAN_LOG_INFO,"IPC kernel: did not send the netlink message\n");
    121 	return -1;
    122 }
    123