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
7 #include <linux/stddef.h>
8 #include <linux/spinlock.h>
9 #include <linux/slab.h>
10 #include <net/caif/caif_layer.h>
11 #include <net/caif/cfsrvl.h>
12 #include <net/caif/cfpkt.h>
14 #define container_obj(layr) ((struct cfsrvl *) layr)
16 #define DGM_CMD_BIT 0x80
17 #define DGM_FLOW_OFF 0x81
18 #define DGM_FLOW_ON 0x80
19 #define DGM_CTRL_PKT_SIZE 1
22 static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt);
23 static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt);
25 struct cflayer *cfdgml_create(u8 channel_id, struct dev_info *dev_info)
27 struct cfsrvl *dgm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
29 pr_warning("CAIF: %s(): Out of memory\n", __func__);
32 caif_assert(offsetof(struct cfsrvl, layer) == 0);
33 memset(dgm, 0, sizeof(struct cfsrvl));
34 cfsrvl_init(dgm, channel_id, dev_info, true);
35 dgm->layer.receive = cfdgml_receive;
36 dgm->layer.transmit = cfdgml_transmit;
37 snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ - 1, "dgm%d", channel_id);
38 dgm->layer.name[CAIF_LAYER_NAME_SZ - 1] = '\0';
42 static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt)
47 caif_assert(layr->up != NULL);
48 caif_assert(layr->receive != NULL);
49 caif_assert(layr->ctrlcmd != NULL);
51 if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
52 pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
57 if ((cmd & DGM_CMD_BIT) == 0) {
58 if (cfpkt_extr_head(pkt, &dgmhdr, 3) < 0) {
59 pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
63 ret = layr->up->receive(layr->up, pkt);
68 case DGM_FLOW_OFF: /* FLOW OFF */
69 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
72 case DGM_FLOW_ON: /* FLOW ON */
73 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
78 pr_info("CAIF: %s(): Unknown datagram control %d (0x%x)\n",
84 static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt)
87 struct caif_payload_info *info;
88 struct cfsrvl *service = container_obj(layr);
90 if (!cfsrvl_ready(service, &ret))
93 /* STE Modem cannot handle more than 1500 bytes datagrams */
94 if (cfpkt_getlen(pkt) > DGM_MTU)
97 cfpkt_add_head(pkt, &zero, 4);
99 /* Add info for MUX-layer to route the packet out. */
100 info = cfpkt_info(pkt);
101 info->channel_id = service->layer.id;
102 /* To optimize alignment, we add up the size of CAIF header
106 info->dev_info = &service->dev_info;
107 ret = layr->dn->transmit(layr->dn, pkt);
110 cfpkt_extr_head(pkt, &tmp32, 4);