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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#define SRVL_CTRL_PKT_SIZE 1
25
26#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
27
28static void cfservl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
29 int phyid)
30{
31 struct cfsrvl *service = container_obj(layr);
32
33 if (layr->up == NULL || layr->up->ctrlcmd == NULL)
34 return;
35
36 switch (ctrl) {
37 case CAIF_CTRLCMD_INIT_RSP:
38 service->open = true;
39 layr->up->ctrlcmd(layr->up, ctrl, phyid);
40 break;
41 case CAIF_CTRLCMD_DEINIT_RSP:
42 case CAIF_CTRLCMD_INIT_FAIL_RSP:
43 service->open = false;
44 layr->up->ctrlcmd(layr->up, ctrl, phyid);
45 break;
46 case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
47 if (phyid != service->dev_info.id)
48 break;
49 if (service->modem_flow_on)
50 layr->up->ctrlcmd(layr->up,
51 CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
52 service->phy_flow_on = false;
53 break;
54 case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
55 if (phyid != service->dev_info.id)
56 return;
57 if (service->modem_flow_on) {
58 layr->up->ctrlcmd(layr->up,
59 CAIF_CTRLCMD_FLOW_ON_IND,
60 phyid);
61 }
62 service->phy_flow_on = true;
63 break;
64 case CAIF_CTRLCMD_FLOW_OFF_IND:
65 if (service->phy_flow_on) {
66 layr->up->ctrlcmd(layr->up,
67 CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
68 }
69 service->modem_flow_on = false;
70 break;
71 case CAIF_CTRLCMD_FLOW_ON_IND:
72 if (service->phy_flow_on) {
73 layr->up->ctrlcmd(layr->up,
74 CAIF_CTRLCMD_FLOW_ON_IND, phyid);
75 }
76 service->modem_flow_on = true;
77 break;
78 case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
79
80 layr->up->ctrlcmd(layr->up,
81 CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
82 break;
83 case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
84 layr->up->ctrlcmd(layr->up, ctrl, phyid);
85 break;
86 default:
87 pr_warn("Unexpected ctrl in cfsrvl (%d)\n", ctrl);
88
89 layr->up->ctrlcmd(layr->up, ctrl, phyid);
90 service->phy_flow_on = true;
91 break;
92 }
93}
94
95static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
96{
97 struct cfsrvl *service = container_obj(layr);
98
99 caif_assert(layr != NULL);
100 caif_assert(layr->dn != NULL);
101 caif_assert(layr->dn->transmit != NULL);
102
103 if (!service->supports_flowctrl)
104 return 0;
105
106 switch (ctrl) {
107 case CAIF_MODEMCMD_FLOW_ON_REQ:
108 {
109 struct cfpkt *pkt;
110 struct caif_payload_info *info;
111 u8 flow_on = SRVL_FLOW_ON;
112 pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
113 if (!pkt)
114 return -ENOMEM;
115
116 if (cfpkt_add_head(pkt, &flow_on, 1) < 0) {
117 pr_err("Packet is erroneous!\n");
118 cfpkt_destroy(pkt);
119 return -EPROTO;
120 }
121 info = cfpkt_info(pkt);
122 info->channel_id = service->layer.id;
123 info->hdr_len = 1;
124 info->dev_info = &service->dev_info;
125 cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
126 return layr->dn->transmit(layr->dn, pkt);
127 }
128 case CAIF_MODEMCMD_FLOW_OFF_REQ:
129 {
130 struct cfpkt *pkt;
131 struct caif_payload_info *info;
132 u8 flow_off = SRVL_FLOW_OFF;
133 pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
134 if (!pkt)
135 return -ENOMEM;
136
137 if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
138 pr_err("Packet is erroneous!\n");
139 cfpkt_destroy(pkt);
140 return -EPROTO;
141 }
142 info = cfpkt_info(pkt);
143 info->channel_id = service->layer.id;
144 info->hdr_len = 1;
145 info->dev_info = &service->dev_info;
146 cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
147 return layr->dn->transmit(layr->dn, pkt);
148 }
149 default:
150 break;
151 }
152 return -EINVAL;
153}
154
155static void cfsrvl_release(struct cflayer *layer)
156{
157 struct cfsrvl *service = container_of(layer, struct cfsrvl, layer);
158 kfree(service);
159}
160
161void cfsrvl_init(struct cfsrvl *service,
162 u8 channel_id,
163 struct dev_info *dev_info,
164 bool supports_flowctrl)
165{
166 caif_assert(offsetof(struct cfsrvl, layer) == 0);
167 service->open = false;
168 service->modem_flow_on = true;
169 service->phy_flow_on = true;
170 service->layer.id = channel_id;
171 service->layer.ctrlcmd = cfservl_ctrlcmd;
172 service->layer.modemcmd = cfservl_modemcmd;
173 service->dev_info = *dev_info;
174 service->supports_flowctrl = supports_flowctrl;
175 service->release = cfsrvl_release;
176}
177
178bool cfsrvl_ready(struct cfsrvl *service, int *err)
179{
180 if (!service->open) {
181 *err = -ENOTCONN;
182 return false;
183 }
184 return true;
185}
186
187u8 cfsrvl_getphyid(struct cflayer *layer)
188{
189 struct cfsrvl *servl = container_obj(layer);
190 return servl->dev_info.id;
191}
192
193bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
194{
195 struct cfsrvl *servl = container_obj(layer);
196 return servl->dev_info.id == phyid;
197}
198
199void caif_free_client(struct cflayer *adap_layer)
200{
201 struct cfsrvl *servl;
202 if (adap_layer == NULL || adap_layer->dn == NULL)
203 return;
204 servl = container_obj(adap_layer->dn);
205 servl->release(&servl->layer);
206}
207EXPORT_SYMBOL(caif_free_client);
208
209void caif_client_register_refcnt(struct cflayer *adapt_layer,
210 void (*hold)(struct cflayer *lyr),
211 void (*put)(struct cflayer *lyr))
212{
213 struct cfsrvl *service;
214
215 if (WARN_ON(adapt_layer == NULL || adapt_layer->dn == NULL))
216 return;
217 service = container_of(adapt_layer->dn, struct cfsrvl, layer);
218 service->hold = hold;
219 service->put = put;
220}
221EXPORT_SYMBOL(caif_client_register_refcnt);
222
