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 17 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt); 18 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt); 19 20 struct cflayer *cfvidl_create(u8 channel_id, struct dev_info *dev_info) 21 { 22 struct cfsrvl *vid = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC); 23 if (!vid) { 24 pr_warning("CAIF: %s(): Out of memory\n", __func__); 25 return NULL; 26 } 27 caif_assert(offsetof(struct cfsrvl, layer) == 0); 28 29 memset(vid, 0, sizeof(struct cfsrvl)); 30 cfsrvl_init(vid, channel_id, dev_info, false); 31 vid->layer.receive = cfvidl_receive; 32 vid->layer.transmit = cfvidl_transmit; 33 snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ - 1, "vid1"); 34 return &vid->layer; 35 } 36 37 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt) 38 { 39 u32 videoheader; 40 if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) { 41 pr_err("CAIF: %s(): Packet is erroneous!\n", __func__); 42 cfpkt_destroy(pkt); 43 return -EPROTO; 44 } 45 return layr->up->receive(layr->up, pkt); 46 } 47 48 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt) 49 { 50 struct cfsrvl *service = container_obj(layr); 51 struct caif_payload_info *info; 52 u32 videoheader = 0; 53 int ret; 54 if (!cfsrvl_ready(service, &ret)) 55 return ret; 56 cfpkt_add_head(pkt, &videoheader, 4); 57 /* Add info for MUX-layer to route the packet out */ 58 info = cfpkt_info(pkt); 59 info->channel_id = service->layer.id; 60 info->dev_info = &service->dev_info; 61 ret = layr->dn->transmit(layr->dn, pkt); 62 if (ret < 0) 63 cfpkt_extr_head(pkt, &videoheader, 4); 64 return ret; 65 } 66