blob: 53194840ecb6cc8464b7a5cba4258dd27f0c6415 [file] [log] [blame]
Sjur Braendelandb482cd22010-03-30 13:56:23 +00001/*
2 * Copyright (C) ST-Ericsson AB 2010
3 * Author: Sjur Brendeland/sjur.brandeland@stericsson.com
4 * License terms: GNU General Public License (GPL) version 2
5 */
6
7#include <linux/stddef.h>
8#include <linux/spinlock.h>
9#include <linux/slab.h>
10#include <net/caif/caif_layer.h>
11#include <net/caif/cfsrvl.h>
12#include <net/caif/cfpkt.h>
13
14#define container_obj(layr) ((struct cfsrvl *) layr)
15
16#define DGM_CMD_BIT 0x80
17#define DGM_FLOW_OFF 0x81
18#define DGM_FLOW_ON 0x80
19#define DGM_CTRL_PKT_SIZE 1
20
21static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt);
22static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt);
23
24struct cflayer *cfdgml_create(u8 channel_id, struct dev_info *dev_info)
25{
26 struct cfsrvl *dgm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
27 if (!dgm) {
28 pr_warning("CAIF: %s(): Out of memory\n", __func__);
29 return NULL;
30 }
31 caif_assert(offsetof(struct cfsrvl, layer) == 0);
32 memset(dgm, 0, sizeof(struct cfsrvl));
33 cfsrvl_init(dgm, channel_id, dev_info);
34 dgm->layer.receive = cfdgml_receive;
35 dgm->layer.transmit = cfdgml_transmit;
36 snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ - 1, "dgm%d", channel_id);
37 dgm->layer.name[CAIF_LAYER_NAME_SZ - 1] = '\0';
38 return &dgm->layer;
39}
40
41static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt)
42{
43 u8 cmd = -1;
44 u8 dgmhdr[3];
45 int ret;
46 caif_assert(layr->up != NULL);
47 caif_assert(layr->receive != NULL);
48 caif_assert(layr->ctrlcmd != NULL);
49
50 if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
51 pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
52 cfpkt_destroy(pkt);
53 return -EPROTO;
54 }
55
56 if ((cmd & DGM_CMD_BIT) == 0) {
57 if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) {
58 pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
59 cfpkt_destroy(pkt);
60 return -EPROTO;
61 }
62 ret = layr->up->receive(layr->up, pkt);
63 return ret;
64 }
65
66 switch (cmd) {
67 case DGM_FLOW_OFF: /* FLOW OFF */
68 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
69 cfpkt_destroy(pkt);
70 return 0;
71 case DGM_FLOW_ON: /* FLOW ON */
72 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
73 cfpkt_destroy(pkt);
74 return 0;
75 default:
76 cfpkt_destroy(pkt);
77 pr_info("CAIF: %s(): Unknown datagram control %d (0x%x)\n",
78 __func__, cmd, cmd);
79 return -EPROTO;
80 }
81}
82
83static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt)
84{
85 u32 zero = 0;
86 struct caif_payload_info *info;
87 struct cfsrvl *service = container_obj(layr);
88 int ret;
89 if (!cfsrvl_ready(service, &ret))
90 return ret;
91
92 cfpkt_add_head(pkt, &zero, 4);
93
94 /* Add info for MUX-layer to route the packet out. */
95 info = cfpkt_info(pkt);
96 info->channel_id = service->layer.id;
97 /* To optimize alignment, we add up the size of CAIF header
98 * before payload.
99 */
100 info->hdr_len = 4;
101 info->dev_info = &service->dev_info;
102 ret = layr->dn->transmit(layr->dn, pkt);
103 if (ret < 0) {
104 u32 tmp32;
105 cfpkt_extr_head(pkt, &tmp32, 4);
106 }
107 return ret;
108}