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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 <net/caif/caif_layer.h>
15#include <net/caif/cfsrvl.h>
16#include <net/caif/cfpkt.h>
17
18#define SRVL_CTRL_PKT_SIZE 1
19#define SRVL_FLOW_OFF 0x81
20#define SRVL_FLOW_ON 0x80
21#define SRVL_SET_PIN 0x82
22#define SRVL_CTRL_PKT_SIZE 1
23
24#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
25
26static void cfservl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
27 int phyid)
28{
29 struct cfsrvl *service = container_obj(layr);
30
31 if (layr->up == NULL || layr->up->ctrlcmd == NULL)
32 return;
33
34 switch (ctrl) {
35 case CAIF_CTRLCMD_INIT_RSP:
36 service->open = true;
37 layr->up->ctrlcmd(layr->up, ctrl, phyid);
38 break;
39 case CAIF_CTRLCMD_DEINIT_RSP:
40 case CAIF_CTRLCMD_INIT_FAIL_RSP:
41 service->open = false;
42 layr->up->ctrlcmd(layr->up, ctrl, phyid);
43 break;
44 case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
45 if (phyid != service->dev_info.id)
46 break;
47 if (service->modem_flow_on)
48 layr->up->ctrlcmd(layr->up,
49 CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
50 service->phy_flow_on = false;
51 break;
52 case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
53 if (phyid != service->dev_info.id)
54 return;
55 if (service->modem_flow_on) {
56 layr->up->ctrlcmd(layr->up,
57 CAIF_CTRLCMD_FLOW_ON_IND,
58 phyid);
59 }
60 service->phy_flow_on = true;
61 break;
62 case CAIF_CTRLCMD_FLOW_OFF_IND:
63 if (service->phy_flow_on) {
64 layr->up->ctrlcmd(layr->up,
65 CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
66 }
67 service->modem_flow_on = false;
68 break;
69 case CAIF_CTRLCMD_FLOW_ON_IND:
70 if (service->phy_flow_on) {
71 layr->up->ctrlcmd(layr->up,
72 CAIF_CTRLCMD_FLOW_ON_IND, phyid);
73 }
74 service->modem_flow_on = true;
75 break;
76 case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
77
78 layr->up->ctrlcmd(layr->up,
79 CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
80 break;
81 case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
82 layr->up->ctrlcmd(layr->up, ctrl, phyid);
83 break;
84 default:
85 pr_warn("Unexpected ctrl in cfsrvl (%d)\n", ctrl);
86
87 layr->up->ctrlcmd(layr->up, ctrl, phyid);
88 service->phy_flow_on = true;
89 break;
90 }
91}
92
93static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
94{
95 struct cfsrvl *service = container_obj(layr);
96
97 caif_assert(layr != NULL);
98 caif_assert(layr->dn != NULL);
99 caif_assert(layr->dn->transmit != NULL);
100
101 if (!service->supports_flowctrl)
102 return 0;
103
104 switch (ctrl) {
105 case CAIF_MODEMCMD_FLOW_ON_REQ:
106 {
107 struct cfpkt *pkt;
108 struct caif_payload_info *info;
109 u8 flow_on = SRVL_FLOW_ON;
110 pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
111 if (!pkt)
112 return -ENOMEM;
113
114 if (cfpkt_add_head(pkt, &flow_on, 1) < 0) {
115 pr_err("Packet is erroneous!\n");
116 cfpkt_destroy(pkt);
117 return -EPROTO;
118 }
119 info = cfpkt_info(pkt);
120 info->channel_id = service->layer.id;
121 info->hdr_len = 1;
122 info->dev_info = &service->dev_info;
123 return layr->dn->transmit(layr->dn, pkt);
124 }
125 case CAIF_MODEMCMD_FLOW_OFF_REQ:
126 {
127 struct cfpkt *pkt;
128 struct caif_payload_info *info;
129 u8 flow_off = SRVL_FLOW_OFF;
130 pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
131 if (!pkt)
132 return -ENOMEM;
133
134 if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
135 pr_err("Packet is erroneous!\n");
136 cfpkt_destroy(pkt);
137 return -EPROTO;
138 }
139 info = cfpkt_info(pkt);
140 info->channel_id = service->layer.id;
141 info->hdr_len = 1;
142 info->dev_info = &service->dev_info;
143 return layr->dn->transmit(layr->dn, pkt);
144 }
145 default:
146 break;
147 }
148 return -EINVAL;
149}
150
151static void cfsrvl_release(struct cflayer *layer)
152{
153 struct cfsrvl *service = container_of(layer, struct cfsrvl, layer);
154 kfree(service);
155}
156
157void cfsrvl_init(struct cfsrvl *service,
158 u8 channel_id,
159 struct dev_info *dev_info,
160 bool supports_flowctrl
161 )
162{
163 caif_assert(offsetof(struct cfsrvl, layer) == 0);
164 service->open = false;
165 service->modem_flow_on = true;
166 service->phy_flow_on = true;
167 service->layer.id = channel_id;
168 service->layer.ctrlcmd = cfservl_ctrlcmd;
169 service->layer.modemcmd = cfservl_modemcmd;
170 service->dev_info = *dev_info;
171 service->supports_flowctrl = supports_flowctrl;
172 service->release = cfsrvl_release;
173}
174
175bool cfsrvl_ready(struct cfsrvl *service, int *err)
176{
177 if (service->open && service->modem_flow_on && service->phy_flow_on)
178 return true;
179 if (!service->open) {
180 *err = -ENOTCONN;
181 return false;
182 }
183 caif_assert(!(service->modem_flow_on && service->phy_flow_on));
184 *err = -EAGAIN;
185 return false;
186}
187
188u8 cfsrvl_getphyid(struct cflayer *layer)
189{
190 struct cfsrvl *servl = container_obj(layer);
191 return servl->dev_info.id;
192}
193
194bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
195{
196 struct cfsrvl *servl = container_obj(layer);
197 return servl->dev_info.id == phyid;
198}
199
200void caif_free_client(struct cflayer *adap_layer)
201{
202 struct cfsrvl *servl;
203 if (adap_layer == NULL || adap_layer->dn == NULL)
204 return;
205 servl = container_obj(adap_layer->dn);
206 servl->release(&servl->layer);
207}
208EXPORT_SYMBOL(caif_free_client);
209
210void caif_client_register_refcnt(struct cflayer *adapt_layer,
211 void (*hold)(struct cflayer *lyr),
212 void (*put)(struct cflayer *lyr))
213{
214 struct cfsrvl *service;
215 service = container_of(adapt_layer->dn, struct cfsrvl, layer);
216
217 WARN_ON(adapt_layer == NULL || adapt_layer->dn == NULL);
218 service->hold = hold;
219 service->put = put;
220}
221EXPORT_SYMBOL(caif_client_register_refcnt);
222
