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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/kernel.h> |
8 | #include <linux/types.h> |
9 | #include <linux/slab.h> |
10 | #include <linux/errno.h> |
11 | #include <net/caif/caif_layer.h> |
12 | #include <net/caif/cfsrvl.h> |
13 | #include <net/caif/cfpkt.h> |
14 | |
15 | #define container_obj(layr) ((struct cfsrvl *) layr) |
16 | #define UTIL_PAYLOAD 0x00 |
17 | #define UTIL_CMD_BIT 0x80 |
18 | #define UTIL_REMOTE_SHUTDOWN 0x82 |
19 | #define UTIL_FLOW_OFF 0x81 |
20 | #define UTIL_FLOW_ON 0x80 |
21 | #define UTIL_CTRL_PKT_SIZE 1 |
22 | static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt); |
23 | static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt); |
24 | |
25 | struct cflayer *cfutill_create(u8 channel_id, struct dev_info *dev_info) |
26 | { |
27 | struct cfsrvl *util = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC); |
28 | if (!util) { |
29 | pr_warning("CAIF: %s(): Out of memory\n", __func__); |
30 | return NULL; |
31 | } |
32 | caif_assert(offsetof(struct cfsrvl, layer) == 0); |
33 | memset(util, 0, sizeof(struct cfsrvl)); |
34 | cfsrvl_init(util, channel_id, dev_info, true); |
35 | util->layer.receive = cfutill_receive; |
36 | util->layer.transmit = cfutill_transmit; |
37 | snprintf(util->layer.name, CAIF_LAYER_NAME_SZ - 1, "util1"); |
38 | return &util->layer; |
39 | } |
40 | |
41 | static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt) |
42 | { |
43 | u8 cmd = -1; |
44 | struct cfsrvl *service = container_obj(layr); |
45 | caif_assert(layr != NULL); |
46 | caif_assert(layr->up != NULL); |
47 | caif_assert(layr->up->receive != NULL); |
48 | caif_assert(layr->up->ctrlcmd != NULL); |
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 | |
55 | switch (cmd) { |
56 | case UTIL_PAYLOAD: |
57 | return layr->up->receive(layr->up, pkt); |
58 | case UTIL_FLOW_OFF: |
59 | layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); |
60 | cfpkt_destroy(pkt); |
61 | return 0; |
62 | case UTIL_FLOW_ON: |
63 | layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); |
64 | cfpkt_destroy(pkt); |
65 | return 0; |
66 | case UTIL_REMOTE_SHUTDOWN: /* Remote Shutdown Request */ |
67 | pr_err("CAIF: %s(): REMOTE SHUTDOWN REQUEST RECEIVED\n", |
68 | __func__); |
69 | layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0); |
70 | service->open = false; |
71 | cfpkt_destroy(pkt); |
72 | return 0; |
73 | default: |
74 | cfpkt_destroy(pkt); |
75 | pr_warning("CAIF: %s(): Unknown service control %d (0x%x)\n", |
76 | __func__, cmd, cmd); |
77 | return -EPROTO; |
78 | } |
79 | } |
80 | |
81 | static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt) |
82 | { |
83 | u8 zero = 0; |
84 | struct caif_payload_info *info; |
85 | int ret; |
86 | struct cfsrvl *service = container_obj(layr); |
87 | caif_assert(layr != NULL); |
88 | caif_assert(layr->dn != NULL); |
89 | caif_assert(layr->dn->transmit != NULL); |
90 | if (!cfsrvl_ready(service, &ret)) |
91 | return ret; |
92 | |
93 | cfpkt_add_head(pkt, &zero, 1); |
94 | /* Add info for MUX-layer to route the packet out. */ |
95 | info = cfpkt_info(pkt); |
96 | info->channel_id = service->layer.id; |
97 | /* |
98 | * To optimize alignment, we add up the size of CAIF header before |
99 | * payload. |
100 | */ |
101 | info->hdr_len = 1; |
102 | info->dev_info = &service->dev_info; |
103 | ret = layr->dn->transmit(layr->dn, pkt); |
104 | if (ret < 0) { |
105 | u32 tmp32; |
106 | cfpkt_extr_head(pkt, &tmp32, 4); |
107 | } |
108 | return ret; |
109 | } |
110 |
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