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/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 = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC); 25 if (!vid) { 26 pr_warn("Out of memory\n"); 27 return NULL; 28 } 29 caif_assert(offsetof(struct cfsrvl, layer) == 0); 30 31 memset(vid, 0, sizeof(struct cfsrvl)); 32 cfsrvl_init(vid, channel_id, dev_info, false); 33 vid->layer.receive = cfvidl_receive; 34 vid->layer.transmit = cfvidl_transmit; 35 snprintf(vid->layer.name, CAIF_LAYER_NAME_SZ - 1, "vid1"); 36 return &vid->layer; 37 } 38 39 static int cfvidl_receive(struct cflayer *layr, struct cfpkt *pkt) 40 { 41 u32 videoheader; 42 if (cfpkt_extr_head(pkt, &videoheader, 4) < 0) { 43 pr_err("Packet is erroneous!\n"); 44 cfpkt_destroy(pkt); 45 return -EPROTO; 46 } 47 return layr->up->receive(layr->up, pkt); 48 } 49 50 static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt) 51 { 52 struct cfsrvl *service = container_obj(layr); 53 struct caif_payload_info *info; 54 u32 videoheader = 0; 55 int ret; 56 if (!cfsrvl_ready(service, &ret)) 57 return ret; 58 cfpkt_add_head(pkt, &videoheader, 4); 59 /* Add info for MUX-layer to route the packet out */ 60 info = cfpkt_info(pkt); 61 info->channel_id = service->layer.id; 62 info->dev_info = &service->dev_info; 63 ret = layr->dn->transmit(layr->dn, pkt); 64 if (ret < 0) 65 cfpkt_extr_head(pkt, &videoheader, 4); 66 return ret; 67 } 68