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authorSjur Braendeland <sjur.brandeland@stericsson.com>2010-03-30 09:56:23 -0400
committerDavid S. Miller <davem@davemloft.net>2010-03-30 22:08:46 -0400
commitb482cd2053e3b90a7b33a78c63cdb6badf2ec383 (patch)
tree1c05e28f19a194b52bf43730fa498dcdb0e92b59 /net/caif/cfsrvl.c
parent2721c5b9dd2a56a9710021c00146bb26ba8dd7b3 (diff)
net-caif: add CAIF core protocol stack
CAIF generic protocol implementation. This layer is somewhat generic in order to be able to use and test it outside the Linux Kernel. cfctrl.c - CAIF control protocol layer cfdbgl.c - CAIF debug protocol layer cfdgml.c - CAIF datagram protocol layer cffrml.c - CAIF framing protocol layer cfmuxl.c - CAIF mux protocol layer cfrfml.c - CAIF remote file manager protocol layer cfserl.c - CAIF serial (fragmentation) protocol layer cfsrvl.c - CAIF generic service layer functions cfutill.c - CAIF utility protocol layer cfveil.c - CAIF AT protocol layer cfvidl.c - CAIF video protocol layer Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/caif/cfsrvl.c')
-rw-r--r--net/caif/cfsrvl.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/net/caif/cfsrvl.c b/net/caif/cfsrvl.c
new file mode 100644
index 000000000000..d470c51c6431
--- /dev/null
+++ b/net/caif/cfsrvl.c
@@ -0,0 +1,185 @@
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#include <linux/kernel.h>
8#include <linux/types.h>
9#include <linux/errno.h>
10#include <linux/slab.h>
11#include <net/caif/caif_layer.h>
12#include <net/caif/cfsrvl.h>
13#include <net/caif/cfpkt.h>
14
15#define SRVL_CTRL_PKT_SIZE 1
16#define SRVL_FLOW_OFF 0x81
17#define SRVL_FLOW_ON 0x80
18#define SRVL_SET_PIN 0x82
19#define SRVL_CTRL_PKT_SIZE 1
20
21#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
22
23static void cfservl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
24 int phyid)
25{
26 struct cfsrvl *service = container_obj(layr);
27 caif_assert(layr->up != NULL);
28 caif_assert(layr->up->ctrlcmd != NULL);
29 switch (ctrl) {
30 case CAIF_CTRLCMD_INIT_RSP:
31 service->open = true;
32 layr->up->ctrlcmd(layr->up, ctrl, phyid);
33 break;
34 case CAIF_CTRLCMD_DEINIT_RSP:
35 case CAIF_CTRLCMD_INIT_FAIL_RSP:
36 service->open = false;
37 layr->up->ctrlcmd(layr->up, ctrl, phyid);
38 break;
39 case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
40 if (phyid != service->dev_info.id)
41 break;
42 if (service->modem_flow_on)
43 layr->up->ctrlcmd(layr->up,
44 CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
45 service->phy_flow_on = false;
46 break;
47 case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
48 if (phyid != service->dev_info.id)
49 return;
50 if (service->modem_flow_on) {
51 layr->up->ctrlcmd(layr->up,
52 CAIF_CTRLCMD_FLOW_ON_IND,
53 phyid);
54 }
55 service->phy_flow_on = true;
56 break;
57 case CAIF_CTRLCMD_FLOW_OFF_IND:
58 if (service->phy_flow_on) {
59 layr->up->ctrlcmd(layr->up,
60 CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
61 }
62 service->modem_flow_on = false;
63 break;
64 case CAIF_CTRLCMD_FLOW_ON_IND:
65 if (service->phy_flow_on) {
66 layr->up->ctrlcmd(layr->up,
67 CAIF_CTRLCMD_FLOW_ON_IND, phyid);
68 }
69 service->modem_flow_on = true;
70 break;
71 case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
72 /* In case interface is down, let's fake a remove shutdown */
73 layr->up->ctrlcmd(layr->up,
74 CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
75 break;
76 case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
77 layr->up->ctrlcmd(layr->up, ctrl, phyid);
78 break;
79 default:
80 pr_warning("CAIF: %s(): "
81 "Unexpected ctrl in cfsrvl (%d)\n", __func__, ctrl);
82 /* We have both modem and phy flow on, send flow on */
83 layr->up->ctrlcmd(layr->up, ctrl, phyid);
84 service->phy_flow_on = true;
85 break;
86 }
87}
88
89static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
90{
91 struct cfsrvl *service = container_obj(layr);
92 caif_assert(layr != NULL);
93 caif_assert(layr->dn != NULL);
94 caif_assert(layr->dn->transmit != NULL);
95 switch (ctrl) {
96 case CAIF_MODEMCMD_FLOW_ON_REQ:
97 {
98 struct cfpkt *pkt;
99 struct caif_payload_info *info;
100 u8 flow_on = SRVL_FLOW_ON;
101 pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
102 if (!pkt) {
103 pr_warning("CAIF: %s(): Out of memory\n",
104 __func__);
105 return -ENOMEM;
106 }
107
108 if (cfpkt_add_head(pkt, &flow_on, 1) < 0) {
109 pr_err("CAIF: %s(): Packet is erroneous!\n",
110 __func__);
111 cfpkt_destroy(pkt);
112 return -EPROTO;
113 }
114 info = cfpkt_info(pkt);
115 info->channel_id = service->layer.id;
116 info->hdr_len = 1;
117 info->dev_info = &service->dev_info;
118 return layr->dn->transmit(layr->dn, pkt);
119 }
120 case CAIF_MODEMCMD_FLOW_OFF_REQ:
121 {
122 struct cfpkt *pkt;
123 struct caif_payload_info *info;
124 u8 flow_off = SRVL_FLOW_OFF;
125 pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
126 if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
127 pr_err("CAIF: %s(): Packet is erroneous!\n",
128 __func__);
129 cfpkt_destroy(pkt);
130 return -EPROTO;
131 }
132 info = cfpkt_info(pkt);
133 info->channel_id = service->layer.id;
134 info->hdr_len = 1;
135 info->dev_info = &service->dev_info;
136 return layr->dn->transmit(layr->dn, pkt);
137 }
138 default:
139 break;
140 }
141 return -EINVAL;
142}
143
144void cfservl_destroy(struct cflayer *layer)
145{
146 kfree(layer);
147}
148
149void cfsrvl_init(struct cfsrvl *service,
150 u8 channel_id,
151 struct dev_info *dev_info)
152{
153 caif_assert(offsetof(struct cfsrvl, layer) == 0);
154 service->open = false;
155 service->modem_flow_on = true;
156 service->phy_flow_on = true;
157 service->layer.id = channel_id;
158 service->layer.ctrlcmd = cfservl_ctrlcmd;
159 service->layer.modemcmd = cfservl_modemcmd;
160 service->dev_info = *dev_info;
161}
162
163bool cfsrvl_ready(struct cfsrvl *service, int *err)
164{
165 if (service->open && service->modem_flow_on && service->phy_flow_on)
166 return true;
167 if (!service->open) {
168 *err = -ENOTCONN;
169 return false;
170 }
171 caif_assert(!(service->modem_flow_on && service->phy_flow_on));
172 *err = -EAGAIN;
173 return false;
174}
175u8 cfsrvl_getphyid(struct cflayer *layer)
176{
177 struct cfsrvl *servl = container_obj(layer);
178 return servl->dev_info.id;
179}
180
181bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
182{
183 struct cfsrvl *servl = container_obj(layer);
184 return servl->dev_info.id == phyid;
185}
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