projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b482cd20 SB |
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 | #include <linux/stddef.h> | |
| 8 | #include <linux/spinlock.h> | |
| 9 | #include <linux/slab.h> | |
| 10 | #include <net/caif/caif_layer.h> | |
| 11 | #include <net/caif/cfsrvl.h> | |
| 12 | #include <net/caif/cfpkt.h> | |
| 13 | ||
| 14 | #define container_obj(layr) container_of(layr, struct cfsrvl, layer) | |
| 15 | ||
| 16 | #define RFM_SEGMENTATION_BIT 0x01 | |
| 17 | #define RFM_PAYLOAD 0x00 | |
| 18 | #define RFM_CMD_BIT 0x80 | |
| 19 | #define RFM_FLOW_OFF 0x81 | |
| 20 | #define RFM_FLOW_ON 0x80 | |
| 21 | #define RFM_SET_PIN 0x82 | |
| 22 | #define RFM_CTRL_PKT_SIZE 1 | |
| 23 | ||
| 24 | static int cfrfml_receive(struct cflayer *layr, struct cfpkt *pkt); | |
| 25 | static int cfrfml_transmit(struct cflayer *layr, struct cfpkt *pkt); | |
| b482cd20 SB |
26 | |
| 27 | struct cflayer *cfrfml_create(u8 channel_id, struct dev_info *dev_info) | |
| 28 | { | |
| 29 | struct cfsrvl *rfm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC); | |
| b1c74247 | 30 | |
| b482cd20 SB |
31 | if (!rfm) { |
| 32 | pr_warning("CAIF: %s(): Out of memory\n", __func__); | |
| 33 | return NULL; | |
| 34 | } | |
| b1c74247 | 35 | |
| b482cd20 | 36 | caif_assert(offsetof(struct cfsrvl, layer) == 0); |
| b1c74247 | 37 | |
| b482cd20 | 38 | memset(rfm, 0, sizeof(struct cfsrvl)); |
| b1c74247 | 39 | cfsrvl_init(rfm, channel_id, dev_info, false); |
| b482cd20 SB |
40 | rfm->layer.receive = cfrfml_receive; |
| 41 | rfm->layer.transmit = cfrfml_transmit; | |
| 42 | snprintf(rfm->layer.name, CAIF_LAYER_NAME_SZ, "rfm%d", channel_id); | |
| 43 | return &rfm->layer; | |
| 44 | } | |
| 45 | ||
| b482cd20 SB |
46 | static int cfrfml_receive(struct cflayer *layr, struct cfpkt *pkt) |
| 47 | { | |
| 48 | u8 tmp; | |
| 49 | bool segmented; | |
| 50 | int ret; | |
| 51 | caif_assert(layr->up != NULL); | |
| 52 | caif_assert(layr->receive != NULL); | |
| 53 | ||
| 54 | /* | |
| 55 | * RFM is taking care of segmentation and stripping of | |
| 56 | * segmentation bit. | |
| 57 | */ | |
| 58 | if (cfpkt_extr_head(pkt, &tmp, 1) < 0) { | |
| 59 | pr_err("CAIF: %s(): Packet is erroneous!\n", __func__); | |
| 60 | cfpkt_destroy(pkt); | |
| 61 | return -EPROTO; | |
| 62 | } | |
| 63 | segmented = tmp & RFM_SEGMENTATION_BIT; | |
| 64 | caif_assert(!segmented); | |
| 65 | ||
| 66 | ret = layr->up->receive(layr->up, pkt); | |
| 67 | return ret; | |
| 68 | } | |
| 69 | ||
| 70 | static int cfrfml_transmit(struct cflayer *layr, struct cfpkt *pkt) | |
| 71 | { | |
| 72 | u8 tmp = 0; | |
| 73 | int ret; | |
| 74 | struct cfsrvl *service = container_obj(layr); | |
| 75 | ||
| 76 | caif_assert(layr->dn != NULL); | |
| 77 | caif_assert(layr->dn->transmit != NULL); | |
| 78 | ||
| 79 | if (!cfsrvl_ready(service, &ret)) | |
| 80 | return ret; | |
| 81 | ||
| aea34e7a | 82 | if (cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) { |
| b482cd20 SB |
83 | pr_err("CAIF: %s():Packet too large - size=%d\n", |
| 84 | __func__, cfpkt_getlen(pkt)); | |
| 85 | return -EOVERFLOW; | |
| 86 | } | |
| 87 | if (cfpkt_add_head(pkt, &tmp, 1) < 0) { | |
| 88 | pr_err("CAIF: %s(): Packet is erroneous!\n", __func__); | |
| 89 | return -EPROTO; | |
| 90 | } | |
| 91 | ||
| 92 | /* Add info for MUX-layer to route the packet out. */ | |
| 93 | cfpkt_info(pkt)->channel_id = service->layer.id; | |
| 94 | /* | |
| 95 | * To optimize alignment, we add up the size of CAIF header before | |
| 96 | * payload. | |
| 97 | */ | |
| 98 | cfpkt_info(pkt)->hdr_len = 1; | |
| 99 | cfpkt_info(pkt)->dev_info = &service->dev_info; | |
| 100 | ret = layr->dn->transmit(layr->dn, pkt); | |
| 101 | if (ret < 0) | |
| 102 | cfpkt_extr_head(pkt, &tmp, 1); | |
| 103 | return ret; | |
| 104 | } |