net: Add a flow_cache_flush_deferred function
[linux-2.6.git] / net / caif / cfveil.c
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 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
8
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
20
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) {
30                 pr_warn("Out of memory\n");
31                 return NULL;
32         }
33         caif_assert(offsetof(struct cfsrvl, layer) == 0);
34         memset(vei, 0, sizeof(struct cfsrvl));
35         cfsrvl_init(vei, channel_id, dev_info, true);
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) {
52                 pr_err("Packet is erroneous!\n");
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 */
72                 pr_warn("Unknown VEI control packet %d (0x%x)!\n", cmd, cmd);
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))
85                 goto err;
86         caif_assert(layr->dn != NULL);
87         caif_assert(layr->dn->transmit != NULL);
88
89         if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
90                 pr_err("Packet is erroneous!\n");
91                 ret = -EPROTO;
92                 goto err;
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;
100         return layr->dn->transmit(layr->dn, pkt);
101 err:
102         cfpkt_destroy(pkt);
103         return ret;
104 }