1 /* 2 * Copyright (C) ST-Ericsson AB 2010 3 * Author: Sjur Brendeland 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/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 19 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt); 20 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt); 21 22 struct cflayer *cfvidl_create(u8 channel_id, struct dev_info *dev_info) 23 { 24 struct cfsrvl *vid = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC); 25 if (!vid) 26 return NULL; 27 caif_assert(offsetof(struct cfsrvl, layer) == 0); 28 29 cfsrvl_init(vid, channel_id, dev_info, false); 30 vid->layer.receive = cfvidl_receive; 31 vid->layer.transmit = cfvidl_transmit; 32 snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ - 1, "vid1"); 33 return &vid->layer; 34 } 35 36 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt) 37 { 38 u32 videoheader; 39 if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) { 40 pr_err("Packet is erroneous!\n"); 41 cfpkt_destroy(pkt); 42 return -EPROTO; 43 } 44 return layr->up->receive(layr->up, pkt); 45 } 46 47 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt) 48 { 49 struct cfsrvl *service = container_obj(layr); 50 struct caif_payload_info *info; 51 u32 videoheader = 0; 52 int ret; 53 54 if (!cfsrvl_ready(service, &ret)) { 55 cfpkt_destroy(pkt); 56 return ret; 57 } 58 59 cfpkt_add_head(pkt, &videoheader, 4); 60 /* Add info for MUX-layer to route the packet out */ 61 info = cfpkt_info(pkt); 62 info->channel_id = service->layer.id; 63 info->dev_info = &service->dev_info; 64 return layr->dn->transmit(layr->dn, pkt); 65 } 66