1/*
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/slab.h>
9#include <net/caif/caif_layer.h>
10#include <net/caif/cfsrvl.h>
11#include <net/caif/cfpkt.h>
12
13#define VEI_PAYLOAD  0x00
14#define VEI_CMD_BIT  0x80
15#define VEI_FLOW_OFF 0x81
16#define VEI_FLOW_ON  0x80
17#define VEI_SET_PIN  0x82
18#define VEI_CTRL_PKT_SIZE 1
19#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
20
21static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt);
22static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt);
23
24struct cflayer *cfvei_create(u8 channel_id, struct dev_info *dev_info)
25{
26	struct cfsrvl *vei = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
27	if (!vei) {
28		pr_warning("CAIF: %s(): Out of memory\n", __func__);
29		return NULL;
30	}
31	caif_assert(offsetof(struct cfsrvl, layer) == 0);
32	memset(vei, 0, sizeof(struct cfsrvl));
33	cfsrvl_init(vei, channel_id, dev_info, true);
34	vei->layer.receive = cfvei_receive;
35	vei->layer.transmit = cfvei_transmit;
36	snprintf(vei->layer.name, CAIF_LAYER_NAME_SZ - 1, "vei%d", channel_id);
37	return &vei->layer;
38}
39
40static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt)
41{
42	u8 cmd;
43	int ret;
44	caif_assert(layr->up != NULL);
45	caif_assert(layr->receive != NULL);
46	caif_assert(layr->ctrlcmd != NULL);
47
48
49	if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
50		pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
51		cfpkt_destroy(pkt);
52		return -EPROTO;
53	}
54	switch (cmd) {
55	case VEI_PAYLOAD:
56		ret = layr->up->receive(layr->up, pkt);
57		return ret;
58	case VEI_FLOW_OFF:
59		layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
60		cfpkt_destroy(pkt);
61		return 0;
62	case VEI_FLOW_ON:
63		layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
64		cfpkt_destroy(pkt);
65		return 0;
66	case VEI_SET_PIN:	/* SET RS232 PIN */
67		cfpkt_destroy(pkt);
68		return 0;
69	default:		/* SET RS232 PIN */
70		pr_warning("CAIF: %s():Unknown VEI control packet %d (0x%x)!\n",
71			   __func__, cmd, cmd);
72		cfpkt_destroy(pkt);
73		return -EPROTO;
74	}
75}
76
77static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt)
78{
79	u8 tmp = 0;
80	struct caif_payload_info *info;
81	int ret;
82	struct cfsrvl *service = container_obj(layr);
83	if (!cfsrvl_ready(service, &ret))
84		return ret;
85	caif_assert(layr->dn != NULL);
86	caif_assert(layr->dn->transmit != NULL);
87
88	if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
89		pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
90		return -EPROTO;
91	}
92
93	/* Add info-> for MUX-layer to route the packet out. */
94	info = cfpkt_info(pkt);
95	info->channel_id = service->layer.id;
96	info->hdr_len = 1;
97	info->dev_info = &service->dev_info;
98	ret = layr->dn->transmit(layr->dn, pkt);
99	if (ret < 0)
100		cfpkt_extr_head(pkt, &tmp, 1);
101	return ret;
102}
103