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b482cd20 SB |
1 | /* |
2 | * Copyright (C) ST-Ericsson AB 2010 | |
26ee65e6 | 3 | * Author: Sjur Brendeland |
b482cd20 SB |
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/kernel.h> |
10 | #include <linux/types.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/errno.h> | |
13 | #include <net/caif/caif_layer.h> | |
14 | #include <net/caif/cfsrvl.h> | |
15 | #include <net/caif/cfpkt.h> | |
16 | ||
17 | #define container_obj(layr) ((struct cfsrvl *) layr) | |
18 | #define UTIL_PAYLOAD 0x00 | |
19 | #define UTIL_CMD_BIT 0x80 | |
20 | #define UTIL_REMOTE_SHUTDOWN 0x82 | |
21 | #define UTIL_FLOW_OFF 0x81 | |
22 | #define UTIL_FLOW_ON 0x80 | |
441c793a | 23 | |
b482cd20 SB |
24 | static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt); |
25 | static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt); | |
26 | ||
27 | struct cflayer *cfutill_create(u8 channel_id, struct dev_info *dev_info) | |
28 | { | |
7ac2ed0c JP |
29 | struct cfsrvl *util = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC); |
30 | if (!util) | |
b482cd20 | 31 | return NULL; |
b482cd20 | 32 | caif_assert(offsetof(struct cfsrvl, layer) == 0); |
b1c74247 | 33 | cfsrvl_init(util, channel_id, dev_info, true); |
b482cd20 SB |
34 | util->layer.receive = cfutill_receive; |
35 | util->layer.transmit = cfutill_transmit; | |
34dcf6a1 | 36 | snprintf(util->layer.name, CAIF_LAYER_NAME_SZ, "util1"); |
b482cd20 SB |
37 | return &util->layer; |
38 | } | |
39 | ||
40 | static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt) | |
41 | { | |
42 | u8 cmd = -1; | |
43 | struct cfsrvl *service = container_obj(layr); | |
44 | caif_assert(layr != NULL); | |
45 | caif_assert(layr->up != NULL); | |
46 | caif_assert(layr->up->receive != NULL); | |
47 | caif_assert(layr->up->ctrlcmd != NULL); | |
48 | if (cfpkt_extr_head(pkt, &cmd, 1) < 0) { | |
b31fa5ba | 49 | pr_err("Packet is erroneous!\n"); |
b482cd20 SB |
50 | cfpkt_destroy(pkt); |
51 | return -EPROTO; | |
52 | } | |
53 | ||
54 | switch (cmd) { | |
55 | case UTIL_PAYLOAD: | |
56 | return layr->up->receive(layr->up, pkt); | |
57 | case UTIL_FLOW_OFF: | |
58 | layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); | |
59 | cfpkt_destroy(pkt); | |
60 | return 0; | |
61 | case UTIL_FLOW_ON: | |
62 | layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); | |
63 | cfpkt_destroy(pkt); | |
64 | return 0; | |
65 | case UTIL_REMOTE_SHUTDOWN: /* Remote Shutdown Request */ | |
b31fa5ba | 66 | pr_err("REMOTE SHUTDOWN REQUEST RECEIVED\n"); |
b482cd20 SB |
67 | layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0); |
68 | service->open = false; | |
69 | cfpkt_destroy(pkt); | |
70 | return 0; | |
71 | default: | |
72 | cfpkt_destroy(pkt); | |
b31fa5ba | 73 | pr_warn("Unknown service control %d (0x%x)\n", cmd, cmd); |
b482cd20 SB |
74 | return -EPROTO; |
75 | } | |
76 | } | |
77 | ||
78 | static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt) | |
79 | { | |
80 | u8 zero = 0; | |
81 | struct caif_payload_info *info; | |
82 | int ret; | |
83 | struct cfsrvl *service = container_obj(layr); | |
84 | caif_assert(layr != NULL); | |
85 | caif_assert(layr->dn != NULL); | |
86 | caif_assert(layr->dn->transmit != NULL); | |
374458b3 DT |
87 | |
88 | if (!cfsrvl_ready(service, &ret)) { | |
89 | cfpkt_destroy(pkt); | |
b482cd20 | 90 | return ret; |
374458b3 | 91 | } |
b482cd20 | 92 | |
b482cd20 SB |
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; | |
4dd820c0 | 103 | return layr->dn->transmit(layr->dn, pkt); |
b482cd20 | 104 | } |