1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) ST-Ericsson AB 2010
4 * Author: Sjur Brendeland
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/errno.h>
12#include <linux/slab.h>
13#include <linux/module.h>
14#include <linux/pkt_sched.h>
15#include <net/caif/caif_layer.h>
16#include <net/caif/cfsrvl.h>
17#include <net/caif/cfpkt.h>
18#include <net/caif/caif_dev.h>
19
20#define SRVL_CTRL_PKT_SIZE 1
21#define SRVL_FLOW_OFF 0x81
22#define SRVL_FLOW_ON 0x80
23#define SRVL_SET_PIN 0x82
24
25#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
26
27static void cfservl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
28 int phyid)
29{
30 struct cfsrvl *service = container_obj(layr);
31
32 if (layr->up == NULL || layr->up->ctrlcmd == NULL)
33 return;
34
35 switch (ctrl) {
36 case CAIF_CTRLCMD_INIT_RSP:
37 service->open = true;
38 layr->up->ctrlcmd(layr->up, ctrl, phyid);
39 break;
40 case CAIF_CTRLCMD_DEINIT_RSP:
41 case CAIF_CTRLCMD_INIT_FAIL_RSP:
42 service->open = false;
43 layr->up->ctrlcmd(layr->up, ctrl, phyid);
44 break;
45 case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
46 if (phyid != service->dev_info.id)
47 break;
48 if (service->modem_flow_on)
49 layr->up->ctrlcmd(layr->up,
50 CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
51 service->phy_flow_on = false;
52 break;
53 case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
54 if (phyid != service->dev_info.id)
55 return;
56 if (service->modem_flow_on) {
57 layr->up->ctrlcmd(layr->up,
58 CAIF_CTRLCMD_FLOW_ON_IND,
59 phyid);
60 }
61 service->phy_flow_on = true;
62 break;
63 case CAIF_CTRLCMD_FLOW_OFF_IND:
64 if (service->phy_flow_on) {
65 layr->up->ctrlcmd(layr->up,
66 CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
67 }
68 service->modem_flow_on = false;
69 break;
70 case CAIF_CTRLCMD_FLOW_ON_IND:
71 if (service->phy_flow_on) {
72 layr->up->ctrlcmd(layr->up,
73 CAIF_CTRLCMD_FLOW_ON_IND, phyid);
74 }
75 service->modem_flow_on = true;
76 break;
77 case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
78 /* In case interface is down, let's fake a remove shutdown */
79 layr->up->ctrlcmd(layr->up,
80 CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
81 break;
82 case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
83 layr->up->ctrlcmd(layr->up, ctrl, phyid);
84 break;
85 default:
86 pr_warn("Unexpected ctrl in cfsrvl (%d)\n", ctrl);
87 /* We have both modem and phy flow on, send flow on */
88 layr->up->ctrlcmd(layr->up, ctrl, phyid);
89 service->phy_flow_on = true;
90 break;
91 }
92}
93
94static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
95{
96 struct cfsrvl *service = container_obj(layr);
97
98 caif_assert(layr != NULL);
99 caif_assert(layr->dn != NULL);
100 caif_assert(layr->dn->transmit != NULL);
101
102 if (!service->supports_flowctrl)
103 return 0;
104
105 switch (ctrl) {
106 case CAIF_MODEMCMD_FLOW_ON_REQ:
107 {
108 struct cfpkt *pkt;
109 struct caif_payload_info *info;
110 u8 flow_on = SRVL_FLOW_ON;
111 pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
112 if (!pkt)
113 return -ENOMEM;
114
115 if (cfpkt_add_head(pkt, data: &flow_on, len: 1) < 0) {
116 pr_err("Packet is erroneous!\n");
117 cfpkt_destroy(pkt);
118 return -EPROTO;
119 }
120 info = cfpkt_info(pkt);
121 info->channel_id = service->layer.id;
122 info->hdr_len = 1;
123 info->dev_info = &service->dev_info;
124 cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
125 return layr->dn->transmit(layr->dn, pkt);
126 }
127 case CAIF_MODEMCMD_FLOW_OFF_REQ:
128 {
129 struct cfpkt *pkt;
130 struct caif_payload_info *info;
131 u8 flow_off = SRVL_FLOW_OFF;
132 pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
133 if (!pkt)
134 return -ENOMEM;
135
136 if (cfpkt_add_head(pkt, data: &flow_off, len: 1) < 0) {
137 pr_err("Packet is erroneous!\n");
138 cfpkt_destroy(pkt);
139 return -EPROTO;
140 }
141 info = cfpkt_info(pkt);
142 info->channel_id = service->layer.id;
143 info->hdr_len = 1;
144 info->dev_info = &service->dev_info;
145 cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
146 return layr->dn->transmit(layr->dn, pkt);
147 }
148 default:
149 break;
150 }
151 return -EINVAL;
152}
153
154static void cfsrvl_release(struct cflayer *layer)
155{
156 struct cfsrvl *service = container_of(layer, struct cfsrvl, layer);
157 kfree(objp: service);
158}
159
160void cfsrvl_init(struct cfsrvl *service,
161 u8 channel_id,
162 struct dev_info *dev_info,
163 bool supports_flowctrl)
164{
165 caif_assert(offsetof(struct cfsrvl, layer) == 0);
166 service->open = false;
167 service->modem_flow_on = true;
168 service->phy_flow_on = true;
169 service->layer.id = channel_id;
170 service->layer.ctrlcmd = cfservl_ctrlcmd;
171 service->layer.modemcmd = cfservl_modemcmd;
172 service->dev_info = *dev_info;
173 service->supports_flowctrl = supports_flowctrl;
174 service->release = cfsrvl_release;
175}
176
177bool cfsrvl_ready(struct cfsrvl *service, int *err)
178{
179 if (!service->open) {
180 *err = -ENOTCONN;
181 return false;
182 }
183 return true;
184}
185
186bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
187{
188 struct cfsrvl *servl = container_obj(layer);
189 return servl->dev_info.id == phyid;
190}
191
192void caif_free_client(struct cflayer *adap_layer)
193{
194 struct cfsrvl *servl;
195 if (adap_layer == NULL || adap_layer->dn == NULL)
196 return;
197 servl = container_obj(adap_layer->dn);
198 servl->release(&servl->layer);
199}
200EXPORT_SYMBOL(caif_free_client);
201
202void caif_client_register_refcnt(struct cflayer *adapt_layer,
203 void (*hold)(struct cflayer *lyr),
204 void (*put)(struct cflayer *lyr))
205{
206 struct cfsrvl *service;
207
208 if (WARN_ON(adapt_layer == NULL || adapt_layer->dn == NULL))
209 return;
210 service = container_of(adapt_layer->dn, struct cfsrvl, layer);
211 service->hold = hold;
212 service->put = put;
213}
214EXPORT_SYMBOL(caif_client_register_refcnt);
215

source code of linux/net/caif/cfsrvl.c