net: introduce DST_NOPEER dst flag
[linux-2.6.git] / net / caif / cfsrvl.c
1 /*
2  * Copyright (C) ST-Ericsson AB 2010
3  * Author:      Sjur Brendeland/sjur.brandeland@stericsson.com
4  * License terms: GNU General Public License (GPL) version 2
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 <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
26 static 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                 /* In case interface is down, let's fake a remove shutdown */
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                 /* We have both modem and phy flow on, send flow on */
87                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
88                 service->phy_flow_on = true;
89                 break;
90         }
91 }
92
93 static 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
155 static void cfsrvl_release(struct cflayer *layer)
156 {
157         struct cfsrvl *service = container_of(layer, struct cfsrvl, layer);
158         kfree(service);
159 }
160
161 void 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
179 bool 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
192 u8 cfsrvl_getphyid(struct cflayer *layer)
193 {
194         struct cfsrvl *servl = container_obj(layer);
195         return servl->dev_info.id;
196 }
197
198 bool 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
204 void 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 }
212 EXPORT_SYMBOL(caif_free_client);
213
214 void 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 }
225 EXPORT_SYMBOL(caif_client_register_refcnt);