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b482cd20 SB |
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 | ||
b31fa5ba JP |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ |
8 | ||
b482cd20 SB |
9 | #include <linux/kernel.h> |
10 | #include <linux/types.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/slab.h> | |
43e36921 | 13 | #include <linux/module.h> |
b482cd20 SB |
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); | |
b1c74247 | 30 | |
43e36921 | 31 | if (layr->up == NULL || layr->up->ctrlcmd == NULL) |
32 | return; | |
b1c74247 | 33 | |
b482cd20 SB |
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: | |
b31fa5ba | 85 | pr_warn("Unexpected ctrl in cfsrvl (%d)\n", ctrl); |
b482cd20 SB |
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); | |
b1c74247 | 96 | |
b482cd20 SB |
97 | caif_assert(layr != NULL); |
98 | caif_assert(layr->dn != NULL); | |
99 | caif_assert(layr->dn->transmit != NULL); | |
b1c74247 SB |
100 | |
101 | if (!service->supports_flowctrl) | |
102 | return 0; | |
103 | ||
b482cd20 SB |
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); | |
7ac2ed0c | 111 | if (!pkt) |
b482cd20 | 112 | return -ENOMEM; |
b482cd20 SB |
113 | |
114 | if (cfpkt_add_head(pkt, &flow_on, 1) < 0) { | |
b31fa5ba | 115 | pr_err("Packet is erroneous!\n"); |
b482cd20 SB |
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); | |
7ac2ed0c | 131 | if (!pkt) |
638e628a | 132 | return -ENOMEM; |
638e628a | 133 | |
b482cd20 | 134 | if (cfpkt_add_head(pkt, &flow_off, 1) < 0) { |
b31fa5ba | 135 | pr_err("Packet is erroneous!\n"); |
b482cd20 SB |
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 | ||
43e36921 | 151 | static void cfsrvl_release(struct cflayer *layer) |
a7da1f55 | 152 | { |
43e36921 | 153 | struct cfsrvl *service = container_of(layer, struct cfsrvl, layer); |
a7da1f55 SB |
154 | kfree(service); |
155 | } | |
156 | ||
b482cd20 | 157 | void cfsrvl_init(struct cfsrvl *service, |
b1c74247 SB |
158 | u8 channel_id, |
159 | struct dev_info *dev_info, | |
160 | bool supports_flowctrl | |
161 | ) | |
b482cd20 SB |
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; | |
b1c74247 | 171 | service->supports_flowctrl = supports_flowctrl; |
a7da1f55 | 172 | service->release = cfsrvl_release; |
5b208656 SB |
173 | } |
174 | ||
b482cd20 SB |
175 | bool 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 | } | |
43e36921 | 187 | |
b482cd20 SB |
188 | u8 cfsrvl_getphyid(struct cflayer *layer) |
189 | { | |
190 | struct cfsrvl *servl = container_obj(layer); | |
191 | return servl->dev_info.id; | |
192 | } | |
193 | ||
194 | bool cfsrvl_phyid_match(struct cflayer *layer, int phyid) | |
195 | { | |
196 | struct cfsrvl *servl = container_obj(layer); | |
197 | return servl->dev_info.id == phyid; | |
198 | } | |
43e36921 | 199 | |
200 | void 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 | } | |
208 | EXPORT_SYMBOL(caif_free_client); | |
209 | ||
210 | void 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 | } | |
221 | EXPORT_SYMBOL(caif_client_register_refcnt); |