| /* |
| * Copyright (C) ST-Ericsson AB 2010 |
| * Author: Sjur Brendeland |
| * License terms: GNU General Public License (GPL) version 2 |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ |
| |
| #include <linux/stddef.h> |
| #include <linux/slab.h> |
| #include <net/caif/caif_layer.h> |
| #include <net/caif/cfsrvl.h> |
| #include <net/caif/cfpkt.h> |
| |
| #define VEI_PAYLOAD 0x00 |
| #define VEI_CMD_BIT 0x80 |
| #define VEI_FLOW_OFF 0x81 |
| #define VEI_FLOW_ON 0x80 |
| #define VEI_SET_PIN 0x82 |
| |
| #define container_obj(layr) container_of(layr, struct cfsrvl, layer) |
| |
| static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt); |
| static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt); |
| |
| struct cflayer *cfvei_create(u8 channel_id, struct dev_info *dev_info) |
| { |
| struct cfsrvl *vei = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC); |
| if (!vei) |
| return NULL; |
| caif_assert(offsetof(struct cfsrvl, layer) == 0); |
| cfsrvl_init(vei, channel_id, dev_info, true); |
| vei->layer.receive = cfvei_receive; |
| vei->layer.transmit = cfvei_transmit; |
| snprintf(vei->layer.name, CAIF_LAYER_NAME_SZ, "vei%d", channel_id); |
| return &vei->layer; |
| } |
| |
| static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt) |
| { |
| u8 cmd; |
| int ret; |
| caif_assert(layr->up != NULL); |
| caif_assert(layr->receive != NULL); |
| caif_assert(layr->ctrlcmd != NULL); |
| |
| |
| if (cfpkt_extr_head(pkt, &cmd, 1) < 0) { |
| pr_err("Packet is erroneous!\n"); |
| cfpkt_destroy(pkt); |
| return -EPROTO; |
| } |
| switch (cmd) { |
| case VEI_PAYLOAD: |
| ret = layr->up->receive(layr->up, pkt); |
| return ret; |
| case VEI_FLOW_OFF: |
| layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); |
| cfpkt_destroy(pkt); |
| return 0; |
| case VEI_FLOW_ON: |
| layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); |
| cfpkt_destroy(pkt); |
| return 0; |
| case VEI_SET_PIN: /* SET RS232 PIN */ |
| cfpkt_destroy(pkt); |
| return 0; |
| default: /* SET RS232 PIN */ |
| pr_warn("Unknown VEI control packet %d (0x%x)!\n", cmd, cmd); |
| cfpkt_destroy(pkt); |
| return -EPROTO; |
| } |
| } |
| |
| static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt) |
| { |
| u8 tmp = 0; |
| struct caif_payload_info *info; |
| int ret; |
| struct cfsrvl *service = container_obj(layr); |
| if (!cfsrvl_ready(service, &ret)) |
| goto err; |
| caif_assert(layr->dn != NULL); |
| caif_assert(layr->dn->transmit != NULL); |
| |
| if (cfpkt_add_head(pkt, &tmp, 1) < 0) { |
| pr_err("Packet is erroneous!\n"); |
| ret = -EPROTO; |
| goto err; |
| } |
| |
| /* Add info-> for MUX-layer to route the packet out. */ |
| info = cfpkt_info(pkt); |
| info->channel_id = service->layer.id; |
| info->hdr_len = 1; |
| info->dev_info = &service->dev_info; |
| return layr->dn->transmit(layr->dn, pkt); |
| err: |
| cfpkt_destroy(pkt); |
| return ret; |
| } |