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8b8d2e08 EL |
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 | |
98b32dec | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
8b8d2e08 EL |
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 | */ | |
33 | int 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, | |
b5faa648 | 36 | data_exchange_cb_t cb, void *cb_context, |
8b8d2e08 EL |
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; | |
b5faa648 | 53 | cmd->cb_context = cb_context; |
8b8d2e08 EL |
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); | |
f0c91038 EL |
106 | |
107 | if (hdev->shutting_down) { | |
108 | err = -ESHUTDOWN; | |
109 | mutex_unlock(&hdev->msg_tx_mutex); | |
110 | goto out_skb_err; | |
111 | } | |
112 | ||
f8bf65bf | 113 | list_add_tail(&cmd->msg_l, &hdev->msg_tx_queue); |
8b8d2e08 EL |
114 | mutex_unlock(&hdev->msg_tx_mutex); |
115 | ||
916082b0 | 116 | schedule_work(&hdev->msg_tx_work); |
8b8d2e08 EL |
117 | |
118 | return 0; | |
119 | ||
120 | out_skb_err: | |
121 | skb_queue_purge(&cmd->msg_frags); | |
122 | kfree(cmd); | |
123 | ||
124 | return err; | |
125 | } | |
126 | ||
8b8d2e08 EL |
127 | /* |
128 | * Receive hcp message for pipe, with type and cmd. | |
129 | * skb contains optional message data only. | |
130 | */ | |
131 | void 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 | } |