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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 pr_warn("Out of memory\n");
113 return -ENOMEM;
114 }
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 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 pr_warn("Out of memory\n");
135 return -ENOMEM;
136 }
137
138 if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
139 pr_err("Packet is erroneous!\n");
140 cfpkt_destroy(pkt);
141 return -EPROTO;
142 }
143 info = cfpkt_info(pkt);
144 info->channel_id = service->layer.id;
145 info->hdr_len = 1;
146 info->dev_info = &service->dev_info;
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{
167 caif_assert(offsetof(struct cfsrvl, layer) == 0);
168 service->open = false;
169 service->modem_flow_on = true;
170 service->phy_flow_on = true;
171 service->layer.id = channel_id;
172 service->layer.ctrlcmd = cfservl_ctrlcmd;
173 service->layer.modemcmd = cfservl_modemcmd;
174 service->dev_info = *dev_info;
175 service->supports_flowctrl = supports_flowctrl;
176 service->release = cfsrvl_release;
177}
178
179bool cfsrvl_ready(struct cfsrvl *service, int *err)
180{
181 if (service->open && service->modem_flow_on && service->phy_flow_on)
182 return true;
183 if (!service->open) {
184 *err = -ENOTCONN;
185 return false;
186 }
187 caif_assert(!(service->modem_flow_on && service->phy_flow_on));
188 *err = -EAGAIN;
189 return false;
190}
191
192u8 cfsrvl_getphyid(struct cflayer *layer)
193{
194 struct cfsrvl *servl = container_obj(layer);
195 return servl->dev_info.id;
196}
197
198bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
199{
200 struct cfsrvl *servl = container_obj(layer);
201 return servl->dev_info.id == phyid;
202}
203
204void caif_free_client(struct cflayer *adap_layer)
205{
206 struct cfsrvl *servl;
207 if (adap_layer == NULL || adap_layer->dn == NULL)
208 return;
209 servl = container_obj(adap_layer->dn);
210 servl->release(&servl->layer);
211}
212EXPORT_SYMBOL(caif_free_client);
213
214void caif_client_register_refcnt(struct cflayer *adapt_layer,
215 void (*hold)(struct cflayer *lyr),
216 void (*put)(struct cflayer *lyr))
217{
218 struct cfsrvl *service;
219 service = container_of(adapt_layer->dn, struct cfsrvl, layer);
220
221 WARN_ON(adapt_layer == NULL || adapt_layer->dn == NULL);
222 service->hold = hold;
223 service->put = put;
224}
225EXPORT_SYMBOL(caif_client_register_refcnt);
226
