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gerrit-public.fairphone.software / kernel / msm-4.19 / 23f5cace4f858ddf40eb0ee77b984d329fd23518 / . / net / caif / cfrfml.c
blob: cd2830fec9351322156e941c9d7043418ea549a4 [file] [log] [blame]
Sjur Braendelandb482cd22010-03-30 13:56:23 +0000[diff] [blame]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
24static int cfrfml_receive(struct cflayer *layr, struct cfpkt *pkt);
25static int cfrfml_transmit(struct cflayer *layr, struct cfpkt *pkt);
26static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl);
27
28struct cflayer *cfrfml_create(u8 channel_id, struct dev_info *dev_info)
29{
30 struct cfsrvl *rfm = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
31 if (!rfm) {
32 pr_warning("CAIF: %s(): Out of memory\n", __func__);
33 return NULL;
34 }
35 caif_assert(offsetof(struct cfsrvl, layer) == 0);
36 memset(rfm, 0, sizeof(struct cfsrvl));
37 cfsrvl_init(rfm, channel_id, dev_info);
38 rfm->layer.modemcmd = cfservl_modemcmd;
39 rfm->layer.receive = cfrfml_receive;
40 rfm->layer.transmit = cfrfml_transmit;
41 snprintf(rfm->layer.name, CAIF_LAYER_NAME_SZ, "rfm%d", channel_id);
42 return &rfm->layer;
43}
44
45static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
46{
47 return -EPROTO;
48}
49
50static int cfrfml_receive(struct cflayer *layr, struct cfpkt *pkt)
51{
52 u8 tmp;
53 bool segmented;
54 int ret;
55 caif_assert(layr->up != NULL);
56 caif_assert(layr->receive != NULL);
57
58 /*
59 * RFM is taking care of segmentation and stripping of
60 * segmentation bit.
61 */
62 if (cfpkt_extr_head(pkt, &tmp, 1) < 0) {
63 pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
64 cfpkt_destroy(pkt);
65 return -EPROTO;
66 }
67 segmented = tmp & RFM_SEGMENTATION_BIT;
68 caif_assert(!segmented);
69
70 ret = layr->up->receive(layr->up, pkt);
71 return ret;
72}
73
74static int cfrfml_transmit(struct cflayer *layr, struct cfpkt *pkt)
75{
76 u8 tmp = 0;
77 int ret;
78 struct cfsrvl *service = container_obj(layr);
79
80 caif_assert(layr->dn != NULL);
81 caif_assert(layr->dn->transmit != NULL);
82
83 if (!cfsrvl_ready(service, &ret))
84 return ret;
85
86 if (!cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) {
87 pr_err("CAIF: %s():Packet too large - size=%d\n",
88 __func__, cfpkt_getlen(pkt));
89 return -EOVERFLOW;
90 }
91 if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
92 pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
93 return -EPROTO;
94 }
95
96 /* Add info for MUX-layer to route the packet out. */
97 cfpkt_info(pkt)->channel_id = service->layer.id;
98 /*
99 * To optimize alignment, we add up the size of CAIF header before
100 * payload.
101 */
102 cfpkt_info(pkt)->hdr_len = 1;
103 cfpkt_info(pkt)->dev_info = &service->dev_info;
104 ret = layr->dn->transmit(layr->dn, pkt);
105 if (ret < 0)
106 cfpkt_extr_head(pkt, &tmp, 1);
107 return ret;
108}