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1/*
2 * Copyright (C) 2012 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#define pr_fmt(fmt) "hci: %s: " fmt, __func__
21
22#include <linux/init.h>
23#include <linux/kernel.h>
24#include <linux/module.h>
25
26#include <net/nfc/hci.h>
27
28#include "hci.h"
29
30/*
31 * Payload is the HCP message data only. Instruction will be prepended.
32 * Guarantees that cb will be called upon completion or timeout delay
33 * counted from the moment the cmd is sent to the transport.
34 */
35int nfc_hci_hcp_message_tx(struct nfc_hci_dev *hdev, u8 pipe,
36 u8 type, u8 instruction,
37 const u8 *payload, size_t payload_len,
38 hci_cmd_cb_t cb, void *cb_data,
39 unsigned long completion_delay)
40{
41 struct nfc_dev *ndev = hdev->ndev;
42 struct hci_msg *cmd;
43 const u8 *ptr = payload;
44 int hci_len, err;
45 bool firstfrag = true;
46
47 cmd = kzalloc(sizeof(struct hci_msg), GFP_KERNEL);
48 if (cmd == NULL)
49 return -ENOMEM;
50
51 INIT_LIST_HEAD(&cmd->msg_l);
52 skb_queue_head_init(&cmd->msg_frags);
53 cmd->wait_response = (type == NFC_HCI_HCP_COMMAND) ? true : false;
54 cmd->cb = cb;
55 cmd->cb_context = cb_data;
56 cmd->completion_delay = completion_delay;
57
58 hci_len = payload_len + 1;
59 while (hci_len > 0) {
60 struct sk_buff *skb;
61 int skb_len, data_link_len;
62 struct hcp_packet *packet;
63
64 if (NFC_HCI_HCP_PACKET_HEADER_LEN + hci_len <=
65 hdev->max_data_link_payload)
66 data_link_len = hci_len;
67 else
68 data_link_len = hdev->max_data_link_payload -
69 NFC_HCI_HCP_PACKET_HEADER_LEN;
70
71 skb_len = ndev->tx_headroom + NFC_HCI_HCP_PACKET_HEADER_LEN +
72 data_link_len + ndev->tx_tailroom;
73 hci_len -= data_link_len;
74
75 skb = alloc_skb(skb_len, GFP_KERNEL);
76 if (skb == NULL) {
77 err = -ENOMEM;
78 goto out_skb_err;
79 }
80 skb_reserve(skb, ndev->tx_headroom);
81
82 skb_put(skb, NFC_HCI_HCP_PACKET_HEADER_LEN + data_link_len);
83
84 /* Only the last fragment will have the cb bit set to 1 */
85 packet = (struct hcp_packet *)skb->data;
86 packet->header = pipe;
87 if (firstfrag) {
88 firstfrag = false;
89 packet->message.header = HCP_HEADER(type, instruction);
90 if (ptr) {
91 memcpy(packet->message.data, ptr,
92 data_link_len - 1);
93 ptr += data_link_len - 1;
94 }
95 } else {
96 memcpy(&packet->message, ptr, data_link_len);
97 ptr += data_link_len;
98 }
99
100 /* This is the last fragment, set the cb bit */
101 if (hci_len == 0)
102 packet->header |= ~NFC_HCI_FRAGMENT;
103
104 skb_queue_tail(&cmd->msg_frags, skb);
105 }
106
107 mutex_lock(&hdev->msg_tx_mutex);
108 list_add_tail(&hdev->msg_tx_queue, &cmd->msg_l);
109 mutex_unlock(&hdev->msg_tx_mutex);
110
111 queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
112
113 return 0;
114
115out_skb_err:
116 skb_queue_purge(&cmd->msg_frags);
117 kfree(cmd);
118
119 return err;
120}
121
122u8 nfc_hci_pipe2gate(struct nfc_hci_dev *hdev, u8 pipe)
123{
124 int gate;
125
126 for (gate = 0; gate < NFC_HCI_MAX_GATES; gate++)
127 if (hdev->gate2pipe[gate] == pipe)
128 return gate;
129
130 return 0xff;
131}
132
133/*
134 * Receive hcp message for pipe, with type and cmd.
135 * skb contains optional message data only.
136 */
137void nfc_hci_hcp_message_rx(struct nfc_hci_dev *hdev, u8 pipe, u8 type,
138 u8 instruction, struct sk_buff *skb)
139{
140 switch (type) {
141 case NFC_HCI_HCP_RESPONSE:
142 nfc_hci_resp_received(hdev, instruction, skb);
143 break;
144 case NFC_HCI_HCP_COMMAND:
145 nfc_hci_cmd_received(hdev, pipe, instruction, skb);
146 break;
147 case NFC_HCI_HCP_EVENT:
148 nfc_hci_event_received(hdev, pipe, instruction, skb);
149 break;
150 default:
151 pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
152 type, instruction);
153 kfree_skb(skb);
154 break;
155 }
156}
1/*
2 * Copyright (C) 2012 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 */
17
18#define pr_fmt(fmt) "hci: %s: " fmt, __func__
19
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23
24#include <net/nfc/hci.h>
25
26#include "hci.h"
27
28/*
29 * Payload is the HCP message data only. Instruction will be prepended.
30 * Guarantees that cb will be called upon completion or timeout delay
31 * counted from the moment the cmd is sent to the transport.
32 */
33int nfc_hci_hcp_message_tx(struct nfc_hci_dev *hdev, u8 pipe,
34 u8 type, u8 instruction,
35 const u8 *payload, size_t payload_len,
36 data_exchange_cb_t cb, void *cb_context,
37 unsigned long completion_delay)
38{
39 struct nfc_dev *ndev = hdev->ndev;
40 struct hci_msg *cmd;
41 const u8 *ptr = payload;
42 int hci_len, err;
43 bool firstfrag = true;
44
45 cmd = kzalloc(sizeof(struct hci_msg), GFP_KERNEL);
46 if (cmd == NULL)
47 return -ENOMEM;
48
49 INIT_LIST_HEAD(&cmd->msg_l);
50 skb_queue_head_init(&cmd->msg_frags);
51 cmd->wait_response = (type == NFC_HCI_HCP_COMMAND) ? true : false;
52 cmd->cb = cb;
53 cmd->cb_context = cb_context;
54 cmd->completion_delay = completion_delay;
55
56 hci_len = payload_len + 1;
57 while (hci_len > 0) {
58 struct sk_buff *skb;
59 int skb_len, data_link_len;
60 struct hcp_packet *packet;
61
62 if (NFC_HCI_HCP_PACKET_HEADER_LEN + hci_len <=
63 hdev->max_data_link_payload)
64 data_link_len = hci_len;
65 else
66 data_link_len = hdev->max_data_link_payload -
67 NFC_HCI_HCP_PACKET_HEADER_LEN;
68
69 skb_len = ndev->tx_headroom + NFC_HCI_HCP_PACKET_HEADER_LEN +
70 data_link_len + ndev->tx_tailroom;
71 hci_len -= data_link_len;
72
73 skb = alloc_skb(skb_len, GFP_KERNEL);
74 if (skb == NULL) {
75 err = -ENOMEM;
76 goto out_skb_err;
77 }
78 skb_reserve(skb, ndev->tx_headroom);
79
80 skb_put(skb, NFC_HCI_HCP_PACKET_HEADER_LEN + data_link_len);
81
82 /* Only the last fragment will have the cb bit set to 1 */
83 packet = (struct hcp_packet *)skb->data;
84 packet->header = pipe;
85 if (firstfrag) {
86 firstfrag = false;
87 packet->message.header = HCP_HEADER(type, instruction);
88 if (ptr) {
89 memcpy(packet->message.data, ptr,
90 data_link_len - 1);
91 ptr += data_link_len - 1;
92 }
93 } else {
94 memcpy(&packet->message, ptr, data_link_len);
95 ptr += data_link_len;
96 }
97
98 /* This is the last fragment, set the cb bit */
99 if (hci_len == 0)
100 packet->header |= ~NFC_HCI_FRAGMENT;
101
102 skb_queue_tail(&cmd->msg_frags, skb);
103 }
104
105 mutex_lock(&hdev->msg_tx_mutex);
106
107 if (hdev->shutting_down) {
108 err = -ESHUTDOWN;
109 mutex_unlock(&hdev->msg_tx_mutex);
110 goto out_skb_err;
111 }
112
113 list_add_tail(&cmd->msg_l, &hdev->msg_tx_queue);
114 mutex_unlock(&hdev->msg_tx_mutex);
115
116 schedule_work(&hdev->msg_tx_work);
117
118 return 0;
119
120out_skb_err:
121 skb_queue_purge(&cmd->msg_frags);
122 kfree(cmd);
123
124 return err;
125}
126
127/*
128 * Receive hcp message for pipe, with type and cmd.
129 * skb contains optional message data only.
130 */
131void nfc_hci_hcp_message_rx(struct nfc_hci_dev *hdev, u8 pipe, u8 type,
132 u8 instruction, struct sk_buff *skb)
133{
134 switch (type) {
135 case NFC_HCI_HCP_RESPONSE:
136 nfc_hci_resp_received(hdev, instruction, skb);
137 break;
138 case NFC_HCI_HCP_COMMAND:
139 nfc_hci_cmd_received(hdev, pipe, instruction, skb);
140 break;
141 case NFC_HCI_HCP_EVENT:
142 nfc_hci_event_received(hdev, pipe, instruction, skb);
143 break;
144 default:
145 pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
146 type, instruction);
147 kfree_skb(skb);
148 break;
149 }
150}