Commit | Line | Data |
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6a2968aa IE |
1 | /* |
2 | * The NFC Controller Interface is the communication protocol between an | |
3 | * NFC Controller (NFCC) and a Device Host (DH). | |
4 | * | |
5 | * Copyright (C) 2011 Texas Instruments, Inc. | |
122c1958 | 6 | * Copyright (C) 2014 Marvell International Ltd. |
6a2968aa IE |
7 | * |
8 | * Written by Ilan Elias <ilane@ti.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 | |
12 | * as published by the Free Software Foundation | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
98b32dec | 20 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
6a2968aa IE |
21 | * |
22 | */ | |
23 | ||
52858b51 | 24 | #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
ed1e0ad8 | 25 | |
6a2968aa IE |
26 | #include <linux/types.h> |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/wait.h> | |
29 | #include <linux/bitops.h> | |
30 | #include <linux/skbuff.h> | |
31 | ||
32 | #include "../nfc.h" | |
33 | #include <net/nfc/nci.h> | |
34 | #include <net/nfc/nci_core.h> | |
35 | #include <linux/nfc.h> | |
36 | ||
37 | /* Complete data exchange transaction and forward skb to nfc core */ | |
eb9bc6e9 | 38 | void nci_data_exchange_complete(struct nci_dev *ndev, struct sk_buff *skb, |
4aeee687 | 39 | __u8 conn_id, int err) |
6a2968aa | 40 | { |
4aeee687 CR |
41 | struct nci_conn_info *conn_info; |
42 | data_exchange_cb_t cb; | |
43 | void *cb_context; | |
44 | ||
45 | conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id); | |
46 | if (!conn_info) { | |
47 | kfree_skb(skb); | |
48 | goto exit; | |
49 | } | |
50 | ||
51 | cb = conn_info->data_exchange_cb; | |
52 | cb_context = conn_info->data_exchange_cb_context; | |
6a2968aa | 53 | |
24bf3304 | 54 | pr_debug("len %d, err %d\n", skb ? skb->len : 0, err); |
6a2968aa | 55 | |
c4bf98b2 IE |
56 | /* data exchange is complete, stop the data timer */ |
57 | del_timer_sync(&ndev->data_timer); | |
58 | clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags); | |
59 | ||
6a2968aa | 60 | if (cb) { |
6a2968aa IE |
61 | /* forward skb to nfc core */ |
62 | cb(cb_context, skb, err); | |
63 | } else if (skb) { | |
ed1e0ad8 | 64 | pr_err("no rx callback, dropping rx data...\n"); |
6a2968aa IE |
65 | |
66 | /* no waiting callback, free skb */ | |
67 | kfree_skb(skb); | |
68 | } | |
38f04c6b | 69 | |
4aeee687 | 70 | exit: |
38f04c6b | 71 | clear_bit(NCI_DATA_EXCHANGE, &ndev->flags); |
6a2968aa IE |
72 | } |
73 | ||
74 | /* ----------------- NCI TX Data ----------------- */ | |
75 | ||
76 | static inline void nci_push_data_hdr(struct nci_dev *ndev, | |
eb9bc6e9 SO |
77 | __u8 conn_id, |
78 | struct sk_buff *skb, | |
79 | __u8 pbf) | |
6a2968aa IE |
80 | { |
81 | struct nci_data_hdr *hdr; | |
82 | int plen = skb->len; | |
83 | ||
84 | hdr = (struct nci_data_hdr *) skb_push(skb, NCI_DATA_HDR_SIZE); | |
85 | hdr->conn_id = conn_id; | |
86 | hdr->rfu = 0; | |
87 | hdr->plen = plen; | |
88 | ||
89 | nci_mt_set((__u8 *)hdr, NCI_MT_DATA_PKT); | |
90 | nci_pbf_set((__u8 *)hdr, pbf); | |
6a2968aa IE |
91 | } |
92 | ||
2663589c RD |
93 | int nci_conn_max_data_pkt_payload_size(struct nci_dev *ndev, __u8 conn_id) |
94 | { | |
95 | struct nci_conn_info *conn_info; | |
96 | ||
97 | conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id); | |
98 | if (!conn_info) | |
99 | return -EPROTO; | |
100 | ||
101 | return conn_info->max_pkt_payload_len; | |
102 | } | |
103 | EXPORT_SYMBOL(nci_conn_max_data_pkt_payload_size); | |
104 | ||
6a2968aa | 105 | static int nci_queue_tx_data_frags(struct nci_dev *ndev, |
eb9bc6e9 SO |
106 | __u8 conn_id, |
107 | struct sk_buff *skb) { | |
4aeee687 | 108 | struct nci_conn_info *conn_info; |
6a2968aa IE |
109 | int total_len = skb->len; |
110 | unsigned char *data = skb->data; | |
111 | unsigned long flags; | |
112 | struct sk_buff_head frags_q; | |
113 | struct sk_buff *skb_frag; | |
114 | int frag_len; | |
115 | int rc = 0; | |
116 | ||
24bf3304 | 117 | pr_debug("conn_id 0x%x, total_len %d\n", conn_id, total_len); |
6a2968aa | 118 | |
4aeee687 CR |
119 | conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id); |
120 | if (!conn_info) { | |
121 | rc = -EPROTO; | |
122 | goto free_exit; | |
123 | } | |
124 | ||
6a2968aa IE |
125 | __skb_queue_head_init(&frags_q); |
126 | ||
127 | while (total_len) { | |
e8c0dacd | 128 | frag_len = |
4aeee687 | 129 | min_t(int, total_len, conn_info->max_pkt_payload_len); |
6a2968aa IE |
130 | |
131 | skb_frag = nci_skb_alloc(ndev, | |
eb9bc6e9 SO |
132 | (NCI_DATA_HDR_SIZE + frag_len), |
133 | GFP_KERNEL); | |
6a2968aa IE |
134 | if (skb_frag == NULL) { |
135 | rc = -ENOMEM; | |
136 | goto free_exit; | |
137 | } | |
138 | skb_reserve(skb_frag, NCI_DATA_HDR_SIZE); | |
139 | ||
140 | /* first, copy the data */ | |
141 | memcpy(skb_put(skb_frag, frag_len), data, frag_len); | |
142 | ||
143 | /* second, set the header */ | |
144 | nci_push_data_hdr(ndev, conn_id, skb_frag, | |
eb9bc6e9 SO |
145 | ((total_len == frag_len) ? |
146 | (NCI_PBF_LAST) : (NCI_PBF_CONT))); | |
6a2968aa IE |
147 | |
148 | __skb_queue_tail(&frags_q, skb_frag); | |
149 | ||
150 | data += frag_len; | |
151 | total_len -= frag_len; | |
152 | ||
20c239c1 JP |
153 | pr_debug("frag_len %d, remaining total_len %d\n", |
154 | frag_len, total_len); | |
6a2968aa IE |
155 | } |
156 | ||
157 | /* queue all fragments atomically */ | |
158 | spin_lock_irqsave(&ndev->tx_q.lock, flags); | |
159 | ||
160 | while ((skb_frag = __skb_dequeue(&frags_q)) != NULL) | |
161 | __skb_queue_tail(&ndev->tx_q, skb_frag); | |
162 | ||
163 | spin_unlock_irqrestore(&ndev->tx_q.lock, flags); | |
164 | ||
165 | /* free the original skb */ | |
166 | kfree_skb(skb); | |
167 | ||
168 | goto exit; | |
169 | ||
170 | free_exit: | |
171 | while ((skb_frag = __skb_dequeue(&frags_q)) != NULL) | |
172 | kfree_skb(skb_frag); | |
173 | ||
174 | exit: | |
175 | return rc; | |
176 | } | |
177 | ||
178 | /* Send NCI data */ | |
179 | int nci_send_data(struct nci_dev *ndev, __u8 conn_id, struct sk_buff *skb) | |
180 | { | |
4aeee687 | 181 | struct nci_conn_info *conn_info; |
6a2968aa IE |
182 | int rc = 0; |
183 | ||
24bf3304 | 184 | pr_debug("conn_id 0x%x, plen %d\n", conn_id, skb->len); |
6a2968aa | 185 | |
4aeee687 CR |
186 | conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id); |
187 | if (!conn_info) { | |
188 | rc = -EPROTO; | |
189 | goto free_exit; | |
190 | } | |
191 | ||
6a2968aa | 192 | /* check if the packet need to be fragmented */ |
4aeee687 | 193 | if (skb->len <= conn_info->max_pkt_payload_len) { |
6a2968aa IE |
194 | /* no need to fragment packet */ |
195 | nci_push_data_hdr(ndev, conn_id, skb, NCI_PBF_LAST); | |
196 | ||
197 | skb_queue_tail(&ndev->tx_q, skb); | |
198 | } else { | |
199 | /* fragment packet and queue the fragments */ | |
200 | rc = nci_queue_tx_data_frags(ndev, conn_id, skb); | |
201 | if (rc) { | |
ed1e0ad8 | 202 | pr_err("failed to fragment tx data packet\n"); |
6a2968aa IE |
203 | goto free_exit; |
204 | } | |
205 | } | |
206 | ||
4aeee687 | 207 | ndev->cur_conn_id = conn_id; |
6a2968aa IE |
208 | queue_work(ndev->tx_wq, &ndev->tx_work); |
209 | ||
210 | goto exit; | |
211 | ||
212 | free_exit: | |
213 | kfree_skb(skb); | |
214 | ||
215 | exit: | |
216 | return rc; | |
217 | } | |
ea785c09 | 218 | EXPORT_SYMBOL(nci_send_data); |
6a2968aa IE |
219 | |
220 | /* ----------------- NCI RX Data ----------------- */ | |
221 | ||
222 | static void nci_add_rx_data_frag(struct nci_dev *ndev, | |
eb9bc6e9 | 223 | struct sk_buff *skb, |
4aeee687 | 224 | __u8 pbf, __u8 conn_id, __u8 status) |
6a2968aa IE |
225 | { |
226 | int reassembly_len; | |
227 | int err = 0; | |
228 | ||
98ff416f CR |
229 | if (status) { |
230 | err = status; | |
231 | goto exit; | |
232 | } | |
233 | ||
6a2968aa IE |
234 | if (ndev->rx_data_reassembly) { |
235 | reassembly_len = ndev->rx_data_reassembly->len; | |
236 | ||
237 | /* first, make enough room for the already accumulated data */ | |
238 | if (skb_cow_head(skb, reassembly_len)) { | |
ed1e0ad8 | 239 | pr_err("error adding room for accumulated rx data\n"); |
6a2968aa IE |
240 | |
241 | kfree_skb(skb); | |
040487f3 | 242 | skb = NULL; |
6a2968aa IE |
243 | |
244 | kfree_skb(ndev->rx_data_reassembly); | |
040487f3 | 245 | ndev->rx_data_reassembly = NULL; |
6a2968aa IE |
246 | |
247 | err = -ENOMEM; | |
248 | goto exit; | |
249 | } | |
250 | ||
251 | /* second, combine the two fragments */ | |
252 | memcpy(skb_push(skb, reassembly_len), | |
eb9bc6e9 SO |
253 | ndev->rx_data_reassembly->data, |
254 | reassembly_len); | |
6a2968aa IE |
255 | |
256 | /* third, free old reassembly */ | |
257 | kfree_skb(ndev->rx_data_reassembly); | |
040487f3 | 258 | ndev->rx_data_reassembly = NULL; |
6a2968aa IE |
259 | } |
260 | ||
261 | if (pbf == NCI_PBF_CONT) { | |
262 | /* need to wait for next fragment, store skb and exit */ | |
263 | ndev->rx_data_reassembly = skb; | |
264 | return; | |
265 | } | |
266 | ||
267 | exit: | |
4aeee687 | 268 | if (ndev->nfc_dev->rf_mode == NFC_RF_TARGET) { |
122c1958 JL |
269 | /* Data received in Target mode, forward to nfc core */ |
270 | err = nfc_tm_data_received(ndev->nfc_dev, skb); | |
271 | if (err) | |
272 | pr_err("unable to handle received data\n"); | |
273 | } else { | |
4aeee687 | 274 | nci_data_exchange_complete(ndev, skb, conn_id, err); |
122c1958 | 275 | } |
6a2968aa IE |
276 | } |
277 | ||
278 | /* Rx Data packet */ | |
279 | void nci_rx_data_packet(struct nci_dev *ndev, struct sk_buff *skb) | |
280 | { | |
281 | __u8 pbf = nci_pbf(skb->data); | |
98ff416f | 282 | __u8 status = 0; |
4aeee687 CR |
283 | __u8 conn_id = nci_conn_id(skb->data); |
284 | struct nci_conn_info *conn_info; | |
6a2968aa | 285 | |
24bf3304 | 286 | pr_debug("len %d\n", skb->len); |
6a2968aa | 287 | |
20c239c1 JP |
288 | pr_debug("NCI RX: MT=data, PBF=%d, conn_id=%d, plen=%d\n", |
289 | nci_pbf(skb->data), | |
290 | nci_conn_id(skb->data), | |
291 | nci_plen(skb->data)); | |
6a2968aa | 292 | |
4aeee687 CR |
293 | conn_info = nci_get_conn_info_by_conn_id(ndev, nci_conn_id(skb->data)); |
294 | if (!conn_info) | |
295 | return; | |
296 | ||
6a2968aa IE |
297 | /* strip the nci data header */ |
298 | skb_pull(skb, NCI_DATA_HDR_SIZE); | |
299 | ||
83724c33 VC |
300 | if (ndev->target_active_prot == NFC_PROTO_MIFARE || |
301 | ndev->target_active_prot == NFC_PROTO_JEWEL || | |
302 | ndev->target_active_prot == NFC_PROTO_FELICA || | |
303 | ndev->target_active_prot == NFC_PROTO_ISO15693) { | |
6a2968aa | 304 | /* frame I/F => remove the status byte */ |
83724c33 | 305 | pr_debug("frame I/F => remove the status byte\n"); |
98ff416f | 306 | status = skb->data[skb->len - 1]; |
6a2968aa IE |
307 | skb_trim(skb, (skb->len - 1)); |
308 | } | |
309 | ||
4aeee687 | 310 | nci_add_rx_data_frag(ndev, skb, pbf, conn_id, nci_to_errno(status)); |
6a2968aa | 311 | } |