1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * Copyright (C) ST-Ericsson AB 2010 2 * Copyright (C) ST-Ericsson AB 2010
4 * Author: Sjur Brendeland 3 * Author: Sjur Brendeland
>> 4 * License terms: GNU General Public License (GPL) version 2
5 */ 5 */
6 6
7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " f 7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
8 8
9 #include <linux/kernel.h> 9 #include <linux/kernel.h>
10 #include <linux/types.h> 10 #include <linux/types.h>
11 #include <linux/slab.h> 11 #include <linux/slab.h>
12 #include <linux/errno.h> 12 #include <linux/errno.h>
13 #include <net/caif/caif_layer.h> 13 #include <net/caif/caif_layer.h>
14 #include <net/caif/cfsrvl.h> 14 #include <net/caif/cfsrvl.h>
15 #include <net/caif/cfpkt.h> 15 #include <net/caif/cfpkt.h>
16 16
17 #define container_obj(layr) ((struct cfsrvl *) 17 #define container_obj(layr) ((struct cfsrvl *) layr)
18 #define UTIL_PAYLOAD 0x00 18 #define UTIL_PAYLOAD 0x00
19 #define UTIL_CMD_BIT 0x80 19 #define UTIL_CMD_BIT 0x80
20 #define UTIL_REMOTE_SHUTDOWN 0x82 20 #define UTIL_REMOTE_SHUTDOWN 0x82
21 #define UTIL_FLOW_OFF 0x81 21 #define UTIL_FLOW_OFF 0x81
22 #define UTIL_FLOW_ON 0x80 22 #define UTIL_FLOW_ON 0x80
23 23
24 static int cfutill_receive(struct cflayer *lay 24 static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt);
25 static int cfutill_transmit(struct cflayer *la 25 static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt);
26 26
27 struct cflayer *cfutill_create(u8 channel_id, 27 struct cflayer *cfutill_create(u8 channel_id, struct dev_info *dev_info)
28 { 28 {
29 struct cfsrvl *util = kzalloc(sizeof(s 29 struct cfsrvl *util = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
30 if (!util) 30 if (!util)
31 return NULL; 31 return NULL;
32 caif_assert(offsetof(struct cfsrvl, la 32 caif_assert(offsetof(struct cfsrvl, layer) == 0);
33 cfsrvl_init(util, channel_id, dev_info 33 cfsrvl_init(util, channel_id, dev_info, true);
34 util->layer.receive = cfutill_receive; 34 util->layer.receive = cfutill_receive;
35 util->layer.transmit = cfutill_transmi 35 util->layer.transmit = cfutill_transmit;
36 snprintf(util->layer.name, CAIF_LAYER_ !! 36 snprintf(util->layer.name, CAIF_LAYER_NAME_SZ - 1, "util1");
37 return &util->layer; 37 return &util->layer;
38 } 38 }
39 39
40 static int cfutill_receive(struct cflayer *lay 40 static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt)
41 { 41 {
42 u8 cmd = -1; 42 u8 cmd = -1;
43 struct cfsrvl *service = container_obj 43 struct cfsrvl *service = container_obj(layr);
44 caif_assert(layr != NULL); 44 caif_assert(layr != NULL);
45 caif_assert(layr->up != NULL); 45 caif_assert(layr->up != NULL);
46 caif_assert(layr->up->receive != NULL) 46 caif_assert(layr->up->receive != NULL);
47 caif_assert(layr->up->ctrlcmd != NULL) 47 caif_assert(layr->up->ctrlcmd != NULL);
48 if (cfpkt_extr_head(pkt, &cmd, 1) < 0) 48 if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
49 pr_err("Packet is erroneous!\n 49 pr_err("Packet is erroneous!\n");
50 cfpkt_destroy(pkt); 50 cfpkt_destroy(pkt);
51 return -EPROTO; 51 return -EPROTO;
52 } 52 }
53 53
54 switch (cmd) { 54 switch (cmd) {
55 case UTIL_PAYLOAD: 55 case UTIL_PAYLOAD:
56 return layr->up->receive(layr- 56 return layr->up->receive(layr->up, pkt);
57 case UTIL_FLOW_OFF: 57 case UTIL_FLOW_OFF:
58 layr->ctrlcmd(layr, CAIF_CTRLC 58 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
59 cfpkt_destroy(pkt); 59 cfpkt_destroy(pkt);
60 return 0; 60 return 0;
61 case UTIL_FLOW_ON: 61 case UTIL_FLOW_ON:
62 layr->ctrlcmd(layr, CAIF_CTRLC 62 layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
63 cfpkt_destroy(pkt); 63 cfpkt_destroy(pkt);
64 return 0; 64 return 0;
65 case UTIL_REMOTE_SHUTDOWN: /* Rem 65 case UTIL_REMOTE_SHUTDOWN: /* Remote Shutdown Request */
66 pr_err("REMOTE SHUTDOWN REQUES 66 pr_err("REMOTE SHUTDOWN REQUEST RECEIVED\n");
67 layr->ctrlcmd(layr, CAIF_CTRLC 67 layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0);
68 service->open = false; 68 service->open = false;
69 cfpkt_destroy(pkt); 69 cfpkt_destroy(pkt);
70 return 0; 70 return 0;
71 default: 71 default:
72 cfpkt_destroy(pkt); 72 cfpkt_destroy(pkt);
73 pr_warn("Unknown service contr 73 pr_warn("Unknown service control %d (0x%x)\n", cmd, cmd);
74 return -EPROTO; 74 return -EPROTO;
75 } 75 }
76 } 76 }
77 77
78 static int cfutill_transmit(struct cflayer *la 78 static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt)
79 { 79 {
80 u8 zero = 0; 80 u8 zero = 0;
81 struct caif_payload_info *info; 81 struct caif_payload_info *info;
82 int ret; 82 int ret;
83 struct cfsrvl *service = container_obj 83 struct cfsrvl *service = container_obj(layr);
84 caif_assert(layr != NULL); 84 caif_assert(layr != NULL);
85 caif_assert(layr->dn != NULL); 85 caif_assert(layr->dn != NULL);
86 caif_assert(layr->dn->transmit != NULL 86 caif_assert(layr->dn->transmit != NULL);
87 87
88 if (!cfsrvl_ready(service, &ret)) { 88 if (!cfsrvl_ready(service, &ret)) {
89 cfpkt_destroy(pkt); 89 cfpkt_destroy(pkt);
90 return ret; 90 return ret;
91 } 91 }
92 92
93 cfpkt_add_head(pkt, &zero, 1); 93 cfpkt_add_head(pkt, &zero, 1);
94 /* Add info for MUX-layer to route the 94 /* Add info for MUX-layer to route the packet out. */
95 info = cfpkt_info(pkt); 95 info = cfpkt_info(pkt);
96 info->channel_id = service->layer.id; 96 info->channel_id = service->layer.id;
97 /* 97 /*
98 * To optimize alignment, we add up th 98 * To optimize alignment, we add up the size of CAIF header before
99 * payload. 99 * payload.
100 */ 100 */
101 info->hdr_len = 1; 101 info->hdr_len = 1;
102 info->dev_info = &service->dev_info; 102 info->dev_info = &service->dev_info;
103 return layr->dn->transmit(layr->dn, pk 103 return layr->dn->transmit(layr->dn, pkt);
104 } 104 }
105 105
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