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gerrit-public.fairphone.software / kernel / msm / cc10b6ffd39ef982f86de68d95e5811df82cf819 / . / net / caif / cfutill.c
blob: 5fd2c9ea8b42a8dc99e570326ebb60c7f50f2667 [file] [log] [blame]
Sjur Braendelandb482cd22010-03-30 13:56:23 +0000[diff] [blame]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
22static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt);
23static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt);
24
25struct 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);
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
41static 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
81static 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 if (cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) {
94 pr_err("CAIF: %s(): packet too large size=%d\n",
95 __func__, cfpkt_getlen(pkt));
96 return -EOVERFLOW;
97 }
98
99 cfpkt_add_head(pkt, &zero, 1);
100 /* Add info for MUX-layer to route the packet out. */
101 info = cfpkt_info(pkt);
102 info->channel_id = service->layer.id;
103 /*
104 * To optimize alignment, we add up the size of CAIF header before
105 * payload.
106 */
107 info->hdr_len = 1;
108 info->dev_info = &service->dev_info;
109 ret = layr->dn->transmit(layr->dn, pkt);
110 if (ret < 0) {
111 u32 tmp32;
112 cfpkt_extr_head(pkt, &tmp32, 4);
113 }
114 return ret;
115}