1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) ST-Ericsson AB 2010 4 * Author: Sjur Brendeland 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 = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC); 29 if (!vei) 30 return NULL; 31 caif_assert(offsetof(struct cfsrvl, layer) == 0); 32 cfsrvl_init(vei, channel_id, dev_info, true); 33 vei->layer.receive = cfvei_receive; 34 vei->layer.transmit = cfvei_transmit; 35 snprintf(vei->layer.name, CAIF_LAYER_NAME_SZ, "vei%d", channel_id); 36 return &vei->layer; 37 } 38 39 static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt) 40 { 41 u8 cmd; 42 int ret; 43 caif_assert(layr->up != NULL); 44 caif_assert(layr->receive != NULL); 45 caif_assert(layr->ctrlcmd != NULL); 46 47 48 if (cfpkt_extr_head(pkt, &cmd, 1) < 0) { 49 pr_err("Packet is erroneous!\n"); 50 cfpkt_destroy(pkt); 51 return -EPROTO; 52 } 53 switch (cmd) { 54 case VEI_PAYLOAD: 55 ret = layr->up->receive(layr->up, pkt); 56 return ret; 57 case VEI_FLOW_OFF: 58 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); 59 cfpkt_destroy(pkt); 60 return 0; 61 case VEI_FLOW_ON: 62 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); 63 cfpkt_destroy(pkt); 64 return 0; 65 case VEI_SET_PIN: /* SET RS232 PIN */ 66 cfpkt_destroy(pkt); 67 return 0; 68 default: /* SET RS232 PIN */ 69 pr_warn("Unknown VEI control packet %d (0x%x)!\n", cmd, cmd); 70 cfpkt_destroy(pkt); 71 return -EPROTO; 72 } 73 } 74 75 static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt) 76 { 77 u8 tmp = 0; 78 struct caif_payload_info *info; 79 int ret; 80 struct cfsrvl *service = container_obj(layr); 81 if (!cfsrvl_ready(service, &ret)) 82 goto err; 83 caif_assert(layr->dn != NULL); 84 caif_assert(layr->dn->transmit != NULL); 85 86 if (cfpkt_add_head(pkt, &tmp, 1) < 0) { 87 pr_err("Packet is erroneous!\n"); 88 ret = -EPROTO; 89 goto err; 90 } 91 92 /* Add info-> for MUX-layer to route the packet out. */ 93 info = cfpkt_info(pkt); 94 info->channel_id = service->layer.id; 95 info->hdr_len = 1; 96 info->dev_info = &service->dev_info; 97 return layr->dn->transmit(layr->dn, pkt); 98 err: 99 cfpkt_destroy(pkt); 100 return ret; 101 } 102