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