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/stddef.h> 8 #include <linux/slab.h> 9 #include <net/caif/caif_layer.h> 10 #include <net/caif/cfsrvl.h> 11 #include <net/caif/cfpkt.h> 12 13 #define VEI_PAYLOAD 0x00 14 #define VEI_CMD_BIT 0x80 15 #define VEI_FLOW_OFF 0x81 16 #define VEI_FLOW_ON 0x80 17 #define VEI_SET_PIN 0x82 18 #define VEI_CTRL_PKT_SIZE 1 19 #define container_obj(layr) container_of(layr, struct cfsrvl, layer) 20 21 static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt); 22 static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt); 23 24 struct cflayer *cfvei_create(u8 channel_id, struct dev_info *dev_info) 25 { 26 struct cfsrvl *vei = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC); 27 if (!vei) { 28 pr_warning("CAIF: %s(): Out of memory\n", __func__); 29 return NULL; 30 } 31 caif_assert(offsetof(struct cfsrvl, layer) == 0); 32 memset(vei, 0, sizeof(struct cfsrvl)); 33 cfsrvl_init(vei, channel_id, dev_info); 34 vei->layer.receive = cfvei_receive; 35 vei->layer.transmit = cfvei_transmit; 36 snprintf(vei->layer.name, CAIF_LAYER_NAME_SZ - 1, "vei%d", channel_id); 37 return &vei->layer; 38 } 39 40 static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt) 41 { 42 u8 cmd; 43 int ret; 44 caif_assert(layr->up != NULL); 45 caif_assert(layr->receive != NULL); 46 caif_assert(layr->ctrlcmd != NULL); 47 48 49 if (cfpkt_extr_head(pkt, &cmd, 1) < 0) { 50 pr_err("CAIF: %s(): Packet is erroneous!\n", __func__); 51 cfpkt_destroy(pkt); 52 return -EPROTO; 53 } 54 switch (cmd) { 55 case VEI_PAYLOAD: 56 ret = layr->up->receive(layr->up, pkt); 57 return ret; 58 case VEI_FLOW_OFF: 59 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); 60 cfpkt_destroy(pkt); 61 return 0; 62 case VEI_FLOW_ON: 63 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); 64 cfpkt_destroy(pkt); 65 return 0; 66 case VEI_SET_PIN: /* SET RS232 PIN */ 67 cfpkt_destroy(pkt); 68 return 0; 69 default: /* SET RS232 PIN */ 70 pr_warning("CAIF: %s():Unknown VEI control packet %d (0x%x)!\n", 71 __func__, cmd, cmd); 72 cfpkt_destroy(pkt); 73 return -EPROTO; 74 } 75 } 76 77 static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt) 78 { 79 u8 tmp = 0; 80 struct caif_payload_info *info; 81 int ret; 82 struct cfsrvl *service = container_obj(layr); 83 if (!cfsrvl_ready(service, &ret)) 84 return ret; 85 caif_assert(layr->dn != NULL); 86 caif_assert(layr->dn->transmit != NULL); 87 if (cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) { 88 pr_warning("CAIF: %s(): Packet too large - size=%d\n", 89 __func__, cfpkt_getlen(pkt)); 90 return -EOVERFLOW; 91 } 92 93 if (cfpkt_add_head(pkt, &tmp, 1) < 0) { 94 pr_err("CAIF: %s(): Packet is erroneous!\n", __func__); 95 return -EPROTO; 96 } 97 98 /* Add info-> for MUX-layer to route the packet out. */ 99 info = cfpkt_info(pkt); 100 info->channel_id = service->layer.id; 101 info->hdr_len = 1; 102 info->dev_info = &service->dev_info; 103 ret = layr->dn->transmit(layr->dn, pkt); 104 if (ret < 0) 105 cfpkt_extr_head(pkt, &tmp, 1); 106 return ret; 107 } 108