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/*
* File: mhi_proto.c
*
* Copyright (C) 2011 Renesas Mobile Corporation. All rights reserved.
*
* Author: Petri Mattila <petri.to.mattila@renesasmobile.com>
*
* Modem-Host Interface (MHI) Protocol Family
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/if_mhi.h>
#include <linux/mhi.h>
#include <linux/l2mux.h>
#include <net/af_mhi.h>
#include <net/mhi/sock.h>
#include <net/mhi/dgram.h>
#include <net/mhi/raw.h>
#ifdef CONFIG_MHI_DEBUG
# define DPRINTK(...) printk(KERN_DEBUG "AF_MHI: " __VA_ARGS__)
#else
# define DPRINTK(...)
#endif
/* Supported L2 protocols */
static __u8 mhi_protocols[MHI_L3_NPROTO] __read_mostly = { 0, };
/*** Functions ***/
int
mhi_protocol_registered(int protocol)
{
if (protocol >= 0 && protocol < MHI_L3_NPROTO)
return mhi_protocols[protocol];
if (protocol == MHI_L3_ANY)
return 1;
return 0;
}
EXPORT_SYMBOL(mhi_protocol_registered);
int
mhi_register_protocol(int protocol)
{
DPRINTK("mhi_register_protocol: %d\n", protocol);
if (protocol < 0 || protocol >= MHI_L3_NPROTO)
return -EINVAL;
mhi_protocols[protocol] = 1;
return 0;
}
EXPORT_SYMBOL(mhi_register_protocol);
int
mhi_unregister_protocol(int protocol)
{
DPRINTK("mhi_unregister_protocol: %d\n", protocol);
if (protocol < 0 || protocol >= MHI_L3_NPROTO)
return -EINVAL;
mhi_protocols[protocol] = 0;
return 0;
}
EXPORT_SYMBOL(mhi_unregister_protocol);
int
mhi_skb_send(
struct sk_buff *skb,
struct net_device *dev,
u8 proto)
{
int err = 0;
DPRINTK("mhi_skb_send: proto:%d skb_len:%d\n", proto, skb->len);
skb->protocol = htons(ETH_P_MHI);
skb->dev = dev;
if (skb->pkt_type == PACKET_LOOPBACK) {
skb_orphan(skb);
netif_rx_ni(skb);
} else {
if ((proto == MHI_L3_XFILE) ||
(proto == MHI_L3_LOW_PRIO_TEST)) {
skb->priority = 1; /* Low prio */
} else if ((proto == MHI_L3_AUDIO) ||
(proto == MHI_L3_TEST_PRIO) ||
(proto == MHI_L3_HIGH_PRIO_TEST)) {
skb->priority = 6; /* high prio */
} else {
skb->priority = 0; /* medium prio */
}
err = dev_queue_xmit(skb);
}
return err;
}
int
mhi_skb_recv(
struct sk_buff *skb,
struct net_device *dev,
struct packet_type *type,
struct net_device *orig_dev)
{
struct l2muxhdr *l2hdr;
u8 l3pid;
u32 l3len;
int err;
l2hdr = l2mux_hdr(skb);
l3pid = l2mux_get_proto(l2hdr);
l3len = l2mux_get_length(l2hdr);
DPRINTK("mhi_skb_recv: skb_len:%d l3pid:%d l3len:%d\n",
skb->len, l3pid, l3len);
err = mhi_sock_rcv_multicast(skb, l3pid, l3len);
return err;
}
static struct packet_type mhi_packet_type __read_mostly = {
.type = cpu_to_be16(ETH_P_MHI),
.func = mhi_skb_recv,
};
static int __init mhi_proto_init(void)
{
int err;
DPRINTK("mhi_proto_init\n");
err = mhi_sock_init();
if (err) {
printk(KERN_ALERT "MHI socket layer registration failed\n");
goto err0;
}
err = mhi_dgram_proto_init();
if (err) {
printk(KERN_ALERT "MHI DGRAM protocol layer reg failed\n");
goto err1;
}
err = mhi_raw_proto_init();
if (err) {
printk(KERN_ALERT "MHI RAW protocol layer reg failed\n");
goto err2;
}
dev_add_pack(&mhi_packet_type);
return 0;
err2:
mhi_dgram_proto_exit();
err1:
mhi_sock_exit();
err0:
return err;
}
static void __exit mhi_proto_exit(void)
{
DPRINTK("mhi_proto_exit\n");
dev_remove_pack(&mhi_packet_type);
mhi_dgram_proto_exit();
mhi_raw_proto_exit();
mhi_sock_exit();
}
module_init(mhi_proto_init);
module_exit(mhi_proto_exit);
MODULE_ALIAS_NETPROTO(PF_MHI);
MODULE_AUTHOR("Petri Mattila <petri.to.mattila@renesasmobile.com>");
MODULE_DESCRIPTION("MHI Protocol Family for Linux");
MODULE_LICENSE("GPL");
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