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/kernel.h> 10 #include <linux/types.h> 11 #include <linux/slab.h> 12 #include <linux/errno.h> 13 #include <net/caif/caif_layer.h> 14 #include <net/caif/cfsrvl.h> 15 #include <net/caif/cfpkt.h> 16 17 #define container_obj(layr) ((struct cfsrvl *) layr) 18 #define UTIL_PAYLOAD 0x00 19 #define UTIL_CMD_BIT 0x80 20 #define UTIL_REMOTE_SHUTDOWN 0x82 21 #define UTIL_FLOW_OFF 0x81 22 #define UTIL_FLOW_ON 0x80 23 24 static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt); 25 static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt); 26 27 struct cflayer *cfutill_create(u8 channel_id, struct dev_info *dev_info) 28 { 29 struct cfsrvl *util = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC); 30 if (!util) { 31 pr_warn("Out of memory\n"); 32 return NULL; 33 } 34 caif_assert(offsetof(struct cfsrvl, layer) == 0); 35 memset(util, 0, sizeof(struct cfsrvl)); 36 cfsrvl_init(util, channel_id, dev_info, true); 37 util->layer.receive = cfutill_receive; 38 util->layer.transmit = cfutill_transmit; 39 snprintf(util->layer.name, CAIF_LAYER_NAME_SZ - 1, "util1"); 40 return &util->layer; 41 } 42 43 static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt) 44 { 45 u8 cmd = -1; 46 struct cfsrvl *service = container_obj(layr); 47 caif_assert(layr != NULL); 48 caif_assert(layr->up != NULL); 49 caif_assert(layr->up->receive != NULL); 50 caif_assert(layr->up->ctrlcmd != NULL); 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 57 switch (cmd) { 58 case UTIL_PAYLOAD: 59 return layr->up->receive(layr->up, pkt); 60 case UTIL_FLOW_OFF: 61 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0); 62 cfpkt_destroy(pkt); 63 return 0; 64 case UTIL_FLOW_ON: 65 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0); 66 cfpkt_destroy(pkt); 67 return 0; 68 case UTIL_REMOTE_SHUTDOWN: /* Remote Shutdown Request */ 69 pr_err("REMOTE SHUTDOWN REQUEST RECEIVED\n"); 70 layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0); 71 service->open = false; 72 cfpkt_destroy(pkt); 73 return 0; 74 default: 75 cfpkt_destroy(pkt); 76 pr_warn("Unknown service control %d (0x%x)\n", cmd, cmd); 77 return -EPROTO; 78 } 79 } 80 81 static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt) 82 { 83 u8 zero = 0; 84 struct caif_payload_info *info; 85 int ret; 86 struct cfsrvl *service = container_obj(layr); 87 caif_assert(layr != NULL); 88 caif_assert(layr->dn != NULL); 89 caif_assert(layr->dn->transmit != NULL); 90 if (!cfsrvl_ready(service, &ret)) 91 return ret; 92 93 cfpkt_add_head(pkt, &zero, 1); 94 /* Add info for MUX-layer to route the packet out. */ 95 info = cfpkt_info(pkt); 96 info->channel_id = service->layer.id; 97 /* 98 * To optimize alignment, we add up the size of CAIF header before 99 * payload. 100 */ 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 u32 tmp32; 106 cfpkt_extr_head(pkt, &tmp32, 4); 107 } 108 return ret; 109 } 110