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b482cd20 SB |
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 | ||
b31fa5ba JP |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ |
8 | ||
b482cd20 SB |
9 | #include <linux/stddef.h> |
10 | #include <linux/slab.h> | |
11 | #include <net/caif/caif_layer.h> | |
12 | #include <net/caif/cfsrvl.h> | |
13 | #include <net/caif/cfpkt.h> | |
14 | ||
15 | #define VEI_PAYLOAD 0x00 | |
16 | #define VEI_CMD_BIT 0x80 | |
17 | #define VEI_FLOW_OFF 0x81 | |
18 | #define VEI_FLOW_ON 0x80 | |
19 | #define VEI_SET_PIN 0x82 | |
441c793a | 20 | |
b482cd20 SB |
21 | #define container_obj(layr) container_of(layr, struct cfsrvl, layer) |
22 | ||
23 | static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt); | |
24 | static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt); | |
25 | ||
26 | struct cflayer *cfvei_create(u8 channel_id, struct dev_info *dev_info) | |
27 | { | |
28 | struct cfsrvl *vei = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC); | |
29 | if (!vei) { | |
b31fa5ba | 30 | pr_warn("Out of memory\n"); |
b482cd20 SB |
31 | return NULL; |
32 | } | |
33 | caif_assert(offsetof(struct cfsrvl, layer) == 0); | |
34 | memset(vei, 0, sizeof(struct cfsrvl)); | |
b1c74247 | 35 | cfsrvl_init(vei, channel_id, dev_info, true); |
b482cd20 SB |
36 | vei->layer.receive = cfvei_receive; |
37 | vei->layer.transmit = cfvei_transmit; | |
38 | snprintf(vei->layer.name, CAIF_LAYER_NAME_SZ - 1, "vei%d", channel_id); | |
39 | return &vei->layer; | |
40 | } | |
41 | ||
42 | static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt) | |
43 | { | |
44 | u8 cmd; | |
45 | int ret; | |
46 | caif_assert(layr->up != NULL); | |
47 | caif_assert(layr->receive != NULL); | |
48 | caif_assert(layr->ctrlcmd != NULL); | |
49 | ||
50 | ||
51 | if (cfpkt_extr_head(pkt, &cmd, 1) < 0) { | |
b31fa5ba | 52 | pr_err("Packet is erroneous!\n"); |
b482cd20 SB |
53 | cfpkt_destroy(pkt); |
54 | return -EPROTO; | |
55 | } | |
56 | switch (cmd) { | |
57 | case VEI_PAYLOAD: | |
58 | ret = layr->up->receive(layr->up, pkt); | |
59 | return ret; | |
60 | case VEI_FLOW_OFF: | |
61 | layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); | |
62 | cfpkt_destroy(pkt); | |
63 | return 0; | |
64 | case VEI_FLOW_ON: | |
65 | layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); | |
66 | cfpkt_destroy(pkt); | |
67 | return 0; | |
68 | case VEI_SET_PIN: /* SET RS232 PIN */ | |
69 | cfpkt_destroy(pkt); | |
70 | return 0; | |
71 | default: /* SET RS232 PIN */ | |
b31fa5ba | 72 | pr_warn("Unknown VEI control packet %d (0x%x)!\n", cmd, cmd); |
b482cd20 SB |
73 | cfpkt_destroy(pkt); |
74 | return -EPROTO; | |
75 | } | |
76 | } | |
77 | ||
78 | static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt) | |
79 | { | |
80 | u8 tmp = 0; | |
81 | struct caif_payload_info *info; | |
82 | int ret; | |
83 | struct cfsrvl *service = container_obj(layr); | |
84 | if (!cfsrvl_ready(service, &ret)) | |
c85c2951 | 85 | goto err; |
b482cd20 SB |
86 | caif_assert(layr->dn != NULL); |
87 | caif_assert(layr->dn->transmit != NULL); | |
b482cd20 SB |
88 | |
89 | if (cfpkt_add_head(pkt, &tmp, 1) < 0) { | |
b31fa5ba | 90 | pr_err("Packet is erroneous!\n"); |
c85c2951 | 91 | ret = -EPROTO; |
92 | goto err; | |
b482cd20 SB |
93 | } |
94 | ||
95 | /* Add info-> for MUX-layer to route the packet out. */ | |
96 | info = cfpkt_info(pkt); | |
97 | info->channel_id = service->layer.id; | |
98 | info->hdr_len = 1; | |
99 | info->dev_info = &service->dev_info; | |
4dd820c0 | 100 | return layr->dn->transmit(layr->dn, pkt); |
c85c2951 | 101 | err: |
102 | cfpkt_destroy(pkt); | |
103 | return ret; | |
b482cd20 | 104 | } |