1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) ST-Ericsson AB 2010
4*4882a593Smuzhiyun * Author: Sjur Brendeland
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/stddef.h>
10*4882a593Smuzhiyun #include <linux/slab.h>
11*4882a593Smuzhiyun #include <net/caif/caif_layer.h>
12*4882a593Smuzhiyun #include <net/caif/cfsrvl.h>
13*4882a593Smuzhiyun #include <net/caif/cfpkt.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #define VEI_PAYLOAD 0x00
16*4882a593Smuzhiyun #define VEI_CMD_BIT 0x80
17*4882a593Smuzhiyun #define VEI_FLOW_OFF 0x81
18*4882a593Smuzhiyun #define VEI_FLOW_ON 0x80
19*4882a593Smuzhiyun #define VEI_SET_PIN 0x82
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #define container_obj(layr) container_of(layr, struct cfsrvl, layer)
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt);
24*4882a593Smuzhiyun static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt);
25*4882a593Smuzhiyun
cfvei_create(u8 channel_id,struct dev_info * dev_info)26*4882a593Smuzhiyun struct cflayer *cfvei_create(u8 channel_id, struct dev_info *dev_info)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun struct cfsrvl *vei = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
29*4882a593Smuzhiyun if (!vei)
30*4882a593Smuzhiyun return NULL;
31*4882a593Smuzhiyun caif_assert(offsetof(struct cfsrvl, layer) == 0);
32*4882a593Smuzhiyun cfsrvl_init(vei, channel_id, dev_info, true);
33*4882a593Smuzhiyun vei->layer.receive = cfvei_receive;
34*4882a593Smuzhiyun vei->layer.transmit = cfvei_transmit;
35*4882a593Smuzhiyun snprintf(vei->layer.name, CAIF_LAYER_NAME_SZ, "vei%d", channel_id);
36*4882a593Smuzhiyun return &vei->layer;
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
cfvei_receive(struct cflayer * layr,struct cfpkt * pkt)39*4882a593Smuzhiyun static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun u8 cmd;
42*4882a593Smuzhiyun int ret;
43*4882a593Smuzhiyun caif_assert(layr->up != NULL);
44*4882a593Smuzhiyun caif_assert(layr->receive != NULL);
45*4882a593Smuzhiyun caif_assert(layr->ctrlcmd != NULL);
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
49*4882a593Smuzhiyun pr_err("Packet is erroneous!\n");
50*4882a593Smuzhiyun cfpkt_destroy(pkt);
51*4882a593Smuzhiyun return -EPROTO;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun switch (cmd) {
54*4882a593Smuzhiyun case VEI_PAYLOAD:
55*4882a593Smuzhiyun ret = layr->up->receive(layr->up, pkt);
56*4882a593Smuzhiyun return ret;
57*4882a593Smuzhiyun case VEI_FLOW_OFF:
58*4882a593Smuzhiyun layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
59*4882a593Smuzhiyun cfpkt_destroy(pkt);
60*4882a593Smuzhiyun return 0;
61*4882a593Smuzhiyun case VEI_FLOW_ON:
62*4882a593Smuzhiyun layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
63*4882a593Smuzhiyun cfpkt_destroy(pkt);
64*4882a593Smuzhiyun return 0;
65*4882a593Smuzhiyun case VEI_SET_PIN: /* SET RS232 PIN */
66*4882a593Smuzhiyun cfpkt_destroy(pkt);
67*4882a593Smuzhiyun return 0;
68*4882a593Smuzhiyun default: /* SET RS232 PIN */
69*4882a593Smuzhiyun pr_warn("Unknown VEI control packet %d (0x%x)!\n", cmd, cmd);
70*4882a593Smuzhiyun cfpkt_destroy(pkt);
71*4882a593Smuzhiyun return -EPROTO;
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
cfvei_transmit(struct cflayer * layr,struct cfpkt * pkt)75*4882a593Smuzhiyun static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt)
76*4882a593Smuzhiyun {
77*4882a593Smuzhiyun u8 tmp = 0;
78*4882a593Smuzhiyun struct caif_payload_info *info;
79*4882a593Smuzhiyun int ret;
80*4882a593Smuzhiyun struct cfsrvl *service = container_obj(layr);
81*4882a593Smuzhiyun if (!cfsrvl_ready(service, &ret))
82*4882a593Smuzhiyun goto err;
83*4882a593Smuzhiyun caif_assert(layr->dn != NULL);
84*4882a593Smuzhiyun caif_assert(layr->dn->transmit != NULL);
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
87*4882a593Smuzhiyun pr_err("Packet is erroneous!\n");
88*4882a593Smuzhiyun ret = -EPROTO;
89*4882a593Smuzhiyun goto err;
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun /* Add info-> for MUX-layer to route the packet out. */
93*4882a593Smuzhiyun info = cfpkt_info(pkt);
94*4882a593Smuzhiyun info->channel_id = service->layer.id;
95*4882a593Smuzhiyun info->hdr_len = 1;
96*4882a593Smuzhiyun info->dev_info = &service->dev_info;
97*4882a593Smuzhiyun return layr->dn->transmit(layr->dn, pkt);
98*4882a593Smuzhiyun err:
99*4882a593Smuzhiyun cfpkt_destroy(pkt);
100*4882a593Smuzhiyun return ret;
101*4882a593Smuzhiyun }
102