1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Sjur Brendeland
*/
#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cfpkt.h>
#define container_obj(layr) ((struct cfsrvl *) layr)
#define UTIL_PAYLOAD 0x00
#define UTIL_CMD_BIT 0x80
#define UTIL_REMOTE_SHUTDOWN 0x82
#define UTIL_FLOW_OFF 0x81
#define UTIL_FLOW_ON 0x80
static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt);
struct cflayer *cfutill_create(u8 channel_id, struct dev_info *dev_info)
{
struct cfsrvl *util = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
if (!util)
return NULL;
caif_assert(offsetof(struct cfsrvl, layer) == 0);
cfsrvl_init(util, channel_id, dev_info, true);
util->layer.receive = cfutill_receive;
util->layer.transmit = cfutill_transmit;
snprintf(util->layer.name, CAIF_LAYER_NAME_SZ, "util1");
return &util->layer;
}
static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt)
{
u8 cmd = -1;
struct cfsrvl *service = container_obj(layr);
caif_assert(layr != NULL);
caif_assert(layr->up != NULL);
caif_assert(layr->up->receive != NULL);
caif_assert(layr->up->ctrlcmd != NULL);
if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
pr_err("Packet is erroneous!\n");
cfpkt_destroy(pkt);
return -EPROTO;
}
switch (cmd) {
case UTIL_PAYLOAD:
return layr->up->receive(layr->up, pkt);
case UTIL_FLOW_OFF:
layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
cfpkt_destroy(pkt);
return 0;
case UTIL_FLOW_ON:
layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
cfpkt_destroy(pkt);
return 0;
case UTIL_REMOTE_SHUTDOWN: /* Remote Shutdown Request */
pr_err("REMOTE SHUTDOWN REQUEST RECEIVED\n");
layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0);
service->open = false;
cfpkt_destroy(pkt);
return 0;
default:
cfpkt_destroy(pkt);
pr_warn("Unknown service control %d (0x%x)\n", cmd, cmd);
return -EPROTO;
}
}
static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
u8 zero = 0;
struct caif_payload_info *info;
int ret;
struct cfsrvl *service = container_obj(layr);
caif_assert(layr != NULL);
caif_assert(layr->dn != NULL);
caif_assert(layr->dn->transmit != NULL);
if (!cfsrvl_ready(service, &ret)) {
cfpkt_destroy(pkt);
return ret;
}
cfpkt_add_head(pkt, &zero, 1);
/* Add info for MUX-layer to route the packet out. */
info = cfpkt_info(pkt);
info->channel_id = service->layer.id;
/*
* To optimize alignment, we add up the size of CAIF header before
* payload.
*/
info->hdr_len = 1;
info->dev_info = &service->dev_info;
return layr->dn->transmit(layr->dn, pkt);
}
|
