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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | /* * Copyright (C) ST-Ericsson AB 2010 * Author: Sjur Brendeland/sjur.brandeland@stericsson.com * License terms: GNU General Public License (GPL) version 2 */ #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ #include <linux/kernel.h> #include <linux/types.h> #include <linux/slab.h> #include <linux/errno.h> #include <net/caif/caif_layer.h> #include <net/caif/cfsrvl.h> #include <net/caif/cfpkt.h> #define container_obj(layr) ((struct cfsrvl *) layr) #define UTIL_PAYLOAD 0x00 #define UTIL_CMD_BIT 0x80 #define UTIL_REMOTE_SHUTDOWN 0x82 #define UTIL_FLOW_OFF 0x81 #define UTIL_FLOW_ON 0x80 static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt); static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt); struct cflayer *cfutill_create(u8 channel_id, struct dev_info *dev_info) { struct cfsrvl *util = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC); if (!util) { pr_warn("Out of memory\n"); return NULL; } caif_assert(offsetof(struct cfsrvl, layer) == 0); memset(util, 0, sizeof(struct cfsrvl)); cfsrvl_init(util, channel_id, dev_info, true); util->layer.receive = cfutill_receive; util->layer.transmit = cfutill_transmit; snprintf(util->layer.name, CAIF_LAYER_NAME_SZ - 1, "util1"); return &util->layer; } static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt) { u8 cmd = -1; struct cfsrvl *service = container_obj(layr); caif_assert(layr != NULL); caif_assert(layr->up != NULL); caif_assert(layr->up->receive != NULL); caif_assert(layr->up->ctrlcmd != NULL); if (cfpkt_extr_head(pkt, &cmd, 1) < 0) { pr_err("Packet is erroneous!\n"); cfpkt_destroy(pkt); return -EPROTO; } switch (cmd) { case UTIL_PAYLOAD: return layr->up->receive(layr->up, pkt); case UTIL_FLOW_OFF: layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); cfpkt_destroy(pkt); return 0; case UTIL_FLOW_ON: layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); cfpkt_destroy(pkt); return 0; case UTIL_REMOTE_SHUTDOWN: /* Remote Shutdown Request */ pr_err("REMOTE SHUTDOWN REQUEST RECEIVED\n"); layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0); service->open = false; cfpkt_destroy(pkt); return 0; default: cfpkt_destroy(pkt); pr_warn("Unknown service control %d (0x%x)\n", cmd, cmd); return -EPROTO; } } static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt) { u8 zero = 0; struct caif_payload_info *info; int ret; struct cfsrvl *service = container_obj(layr); caif_assert(layr != NULL); caif_assert(layr->dn != NULL); caif_assert(layr->dn->transmit != NULL); if (!cfsrvl_ready(service, &ret)) return ret; cfpkt_add_head(pkt, &zero, 1); /* Add info for MUX-layer to route the packet out. */ info = cfpkt_info(pkt); info->channel_id = service->layer.id; /* * To optimize alignment, we add up the size of CAIF header before * payload. */ info->hdr_len = 1; info->dev_info = &service->dev_info; return layr->dn->transmit(layr->dn, pkt); } |