1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * The NFC Controller Interface is the communication protocol between an
4 * NFC Controller (NFCC) and a Device Host (DH).
5 *
6 * Copyright (C) 2011 Texas Instruments, Inc.
7 *
8 * Written by Ilan Elias <ilane@ti.com>
9 *
10 * Acknowledgements:
11 * This file is based on hci_event.c, which was written
12 * by Maxim Krasnyansky.
13 */
14
15 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
16
17 #include <linux/types.h>
18 #include <linux/interrupt.h>
19 #include <linux/bitops.h>
20 #include <linux/skbuff.h>
21
22 #include "../nfc.h"
23 #include <net/nfc/nci.h>
24 #include <net/nfc/nci_core.h>
25
26 /* Handle NCI Response packets */
27
nci_core_reset_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)28 static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
29 {
30 struct nci_core_reset_rsp *rsp = (void *) skb->data;
31
32 pr_debug("status 0x%x\n", rsp->status);
33
34 if (rsp->status == NCI_STATUS_OK) {
35 ndev->nci_ver = rsp->nci_ver;
36 pr_debug("nci_ver 0x%x, config_status 0x%x\n",
37 rsp->nci_ver, rsp->config_status);
38 }
39
40 nci_req_complete(ndev, rsp->status);
41 }
42
nci_core_init_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)43 static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
44 {
45 struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data;
46 struct nci_core_init_rsp_2 *rsp_2;
47
48 pr_debug("status 0x%x\n", rsp_1->status);
49
50 if (rsp_1->status != NCI_STATUS_OK)
51 goto exit;
52
53 ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features);
54 ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces;
55
56 if (ndev->num_supported_rf_interfaces >
57 NCI_MAX_SUPPORTED_RF_INTERFACES) {
58 ndev->num_supported_rf_interfaces =
59 NCI_MAX_SUPPORTED_RF_INTERFACES;
60 }
61
62 memcpy(ndev->supported_rf_interfaces,
63 rsp_1->supported_rf_interfaces,
64 ndev->num_supported_rf_interfaces);
65
66 rsp_2 = (void *) (skb->data + 6 + rsp_1->num_supported_rf_interfaces);
67
68 ndev->max_logical_connections = rsp_2->max_logical_connections;
69 ndev->max_routing_table_size =
70 __le16_to_cpu(rsp_2->max_routing_table_size);
71 ndev->max_ctrl_pkt_payload_len =
72 rsp_2->max_ctrl_pkt_payload_len;
73 ndev->max_size_for_large_params =
74 __le16_to_cpu(rsp_2->max_size_for_large_params);
75 ndev->manufact_id =
76 rsp_2->manufact_id;
77 ndev->manufact_specific_info =
78 __le32_to_cpu(rsp_2->manufact_specific_info);
79
80 pr_debug("nfcc_features 0x%x\n",
81 ndev->nfcc_features);
82 pr_debug("num_supported_rf_interfaces %d\n",
83 ndev->num_supported_rf_interfaces);
84 pr_debug("supported_rf_interfaces[0] 0x%x\n",
85 ndev->supported_rf_interfaces[0]);
86 pr_debug("supported_rf_interfaces[1] 0x%x\n",
87 ndev->supported_rf_interfaces[1]);
88 pr_debug("supported_rf_interfaces[2] 0x%x\n",
89 ndev->supported_rf_interfaces[2]);
90 pr_debug("supported_rf_interfaces[3] 0x%x\n",
91 ndev->supported_rf_interfaces[3]);
92 pr_debug("max_logical_connections %d\n",
93 ndev->max_logical_connections);
94 pr_debug("max_routing_table_size %d\n",
95 ndev->max_routing_table_size);
96 pr_debug("max_ctrl_pkt_payload_len %d\n",
97 ndev->max_ctrl_pkt_payload_len);
98 pr_debug("max_size_for_large_params %d\n",
99 ndev->max_size_for_large_params);
100 pr_debug("manufact_id 0x%x\n",
101 ndev->manufact_id);
102 pr_debug("manufact_specific_info 0x%x\n",
103 ndev->manufact_specific_info);
104
105 exit:
106 nci_req_complete(ndev, rsp_1->status);
107 }
108
nci_core_set_config_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)109 static void nci_core_set_config_rsp_packet(struct nci_dev *ndev,
110 struct sk_buff *skb)
111 {
112 struct nci_core_set_config_rsp *rsp = (void *) skb->data;
113
114 pr_debug("status 0x%x\n", rsp->status);
115
116 nci_req_complete(ndev, rsp->status);
117 }
118
nci_rf_disc_map_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)119 static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
120 struct sk_buff *skb)
121 {
122 __u8 status = skb->data[0];
123
124 pr_debug("status 0x%x\n", status);
125
126 nci_req_complete(ndev, status);
127 }
128
nci_rf_disc_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)129 static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
130 {
131 struct nci_conn_info *conn_info;
132 __u8 status = skb->data[0];
133
134 pr_debug("status 0x%x\n", status);
135
136 if (status == NCI_STATUS_OK) {
137 atomic_set(&ndev->state, NCI_DISCOVERY);
138
139 conn_info = ndev->rf_conn_info;
140 if (!conn_info) {
141 conn_info = devm_kzalloc(&ndev->nfc_dev->dev,
142 sizeof(struct nci_conn_info),
143 GFP_KERNEL);
144 if (!conn_info) {
145 status = NCI_STATUS_REJECTED;
146 goto exit;
147 }
148 conn_info->conn_id = NCI_STATIC_RF_CONN_ID;
149 INIT_LIST_HEAD(&conn_info->list);
150 list_add(&conn_info->list, &ndev->conn_info_list);
151 ndev->rf_conn_info = conn_info;
152 }
153 }
154
155 exit:
156 nci_req_complete(ndev, status);
157 }
158
nci_rf_disc_select_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)159 static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev,
160 struct sk_buff *skb)
161 {
162 __u8 status = skb->data[0];
163
164 pr_debug("status 0x%x\n", status);
165
166 /* Complete the request on intf_activated_ntf or generic_error_ntf */
167 if (status != NCI_STATUS_OK)
168 nci_req_complete(ndev, status);
169 }
170
nci_rf_deactivate_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)171 static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
172 struct sk_buff *skb)
173 {
174 __u8 status = skb->data[0];
175
176 pr_debug("status 0x%x\n", status);
177
178 /* If target was active, complete the request only in deactivate_ntf */
179 if ((status != NCI_STATUS_OK) ||
180 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
181 nci_clear_target_list(ndev);
182 atomic_set(&ndev->state, NCI_IDLE);
183 nci_req_complete(ndev, status);
184 }
185 }
186
nci_nfcee_discover_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)187 static void nci_nfcee_discover_rsp_packet(struct nci_dev *ndev,
188 struct sk_buff *skb)
189 {
190 struct nci_nfcee_discover_rsp *discover_rsp;
191
192 if (skb->len != 2) {
193 nci_req_complete(ndev, NCI_STATUS_NFCEE_PROTOCOL_ERROR);
194 return;
195 }
196
197 discover_rsp = (struct nci_nfcee_discover_rsp *)skb->data;
198
199 if (discover_rsp->status != NCI_STATUS_OK ||
200 discover_rsp->num_nfcee == 0)
201 nci_req_complete(ndev, discover_rsp->status);
202 }
203
nci_nfcee_mode_set_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)204 static void nci_nfcee_mode_set_rsp_packet(struct nci_dev *ndev,
205 struct sk_buff *skb)
206 {
207 __u8 status = skb->data[0];
208
209 pr_debug("status 0x%x\n", status);
210 nci_req_complete(ndev, status);
211 }
212
nci_core_conn_create_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)213 static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev,
214 struct sk_buff *skb)
215 {
216 __u8 status = skb->data[0];
217 struct nci_conn_info *conn_info = NULL;
218 struct nci_core_conn_create_rsp *rsp;
219
220 pr_debug("status 0x%x\n", status);
221
222 if (status == NCI_STATUS_OK) {
223 rsp = (struct nci_core_conn_create_rsp *)skb->data;
224
225 conn_info = devm_kzalloc(&ndev->nfc_dev->dev,
226 sizeof(*conn_info), GFP_KERNEL);
227 if (!conn_info) {
228 status = NCI_STATUS_REJECTED;
229 goto exit;
230 }
231
232 conn_info->dest_params = devm_kzalloc(&ndev->nfc_dev->dev,
233 sizeof(struct dest_spec_params),
234 GFP_KERNEL);
235 if (!conn_info->dest_params) {
236 status = NCI_STATUS_REJECTED;
237 goto free_conn_info;
238 }
239
240 conn_info->dest_type = ndev->cur_dest_type;
241 conn_info->dest_params->id = ndev->cur_params.id;
242 conn_info->dest_params->protocol = ndev->cur_params.protocol;
243 conn_info->conn_id = rsp->conn_id;
244
245 /* Note: data_exchange_cb and data_exchange_cb_context need to
246 * be specify out of nci_core_conn_create_rsp_packet
247 */
248
249 INIT_LIST_HEAD(&conn_info->list);
250 list_add(&conn_info->list, &ndev->conn_info_list);
251
252 if (ndev->cur_params.id == ndev->hci_dev->nfcee_id)
253 ndev->hci_dev->conn_info = conn_info;
254
255 conn_info->conn_id = rsp->conn_id;
256 conn_info->max_pkt_payload_len = rsp->max_ctrl_pkt_payload_len;
257 atomic_set(&conn_info->credits_cnt, rsp->credits_cnt);
258 }
259
260 free_conn_info:
261 if (status == NCI_STATUS_REJECTED)
262 devm_kfree(&ndev->nfc_dev->dev, conn_info);
263 exit:
264
265 nci_req_complete(ndev, status);
266 }
267
nci_core_conn_close_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)268 static void nci_core_conn_close_rsp_packet(struct nci_dev *ndev,
269 struct sk_buff *skb)
270 {
271 struct nci_conn_info *conn_info;
272 __u8 status = skb->data[0];
273
274 pr_debug("status 0x%x\n", status);
275 if (status == NCI_STATUS_OK) {
276 conn_info = nci_get_conn_info_by_conn_id(ndev,
277 ndev->cur_conn_id);
278 if (conn_info) {
279 list_del(&conn_info->list);
280 devm_kfree(&ndev->nfc_dev->dev, conn_info);
281 }
282 }
283 nci_req_complete(ndev, status);
284 }
285
nci_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)286 void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
287 {
288 __u16 rsp_opcode = nci_opcode(skb->data);
289
290 /* we got a rsp, stop the cmd timer */
291 del_timer(&ndev->cmd_timer);
292
293 pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
294 nci_pbf(skb->data),
295 nci_opcode_gid(rsp_opcode),
296 nci_opcode_oid(rsp_opcode),
297 nci_plen(skb->data));
298
299 /* strip the nci control header */
300 skb_pull(skb, NCI_CTRL_HDR_SIZE);
301
302 if (nci_opcode_gid(rsp_opcode) == NCI_GID_PROPRIETARY) {
303 if (nci_prop_rsp_packet(ndev, rsp_opcode, skb) == -ENOTSUPP) {
304 pr_err("unsupported rsp opcode 0x%x\n",
305 rsp_opcode);
306 }
307
308 goto end;
309 }
310
311 switch (rsp_opcode) {
312 case NCI_OP_CORE_RESET_RSP:
313 nci_core_reset_rsp_packet(ndev, skb);
314 break;
315
316 case NCI_OP_CORE_INIT_RSP:
317 nci_core_init_rsp_packet(ndev, skb);
318 break;
319
320 case NCI_OP_CORE_SET_CONFIG_RSP:
321 nci_core_set_config_rsp_packet(ndev, skb);
322 break;
323
324 case NCI_OP_CORE_CONN_CREATE_RSP:
325 nci_core_conn_create_rsp_packet(ndev, skb);
326 break;
327
328 case NCI_OP_CORE_CONN_CLOSE_RSP:
329 nci_core_conn_close_rsp_packet(ndev, skb);
330 break;
331
332 case NCI_OP_RF_DISCOVER_MAP_RSP:
333 nci_rf_disc_map_rsp_packet(ndev, skb);
334 break;
335
336 case NCI_OP_RF_DISCOVER_RSP:
337 nci_rf_disc_rsp_packet(ndev, skb);
338 break;
339
340 case NCI_OP_RF_DISCOVER_SELECT_RSP:
341 nci_rf_disc_select_rsp_packet(ndev, skb);
342 break;
343
344 case NCI_OP_RF_DEACTIVATE_RSP:
345 nci_rf_deactivate_rsp_packet(ndev, skb);
346 break;
347
348 case NCI_OP_NFCEE_DISCOVER_RSP:
349 nci_nfcee_discover_rsp_packet(ndev, skb);
350 break;
351
352 case NCI_OP_NFCEE_MODE_SET_RSP:
353 nci_nfcee_mode_set_rsp_packet(ndev, skb);
354 break;
355
356 default:
357 pr_err("unknown rsp opcode 0x%x\n", rsp_opcode);
358 break;
359 }
360
361 nci_core_rsp_packet(ndev, rsp_opcode, skb);
362 end:
363 kfree_skb(skb);
364
365 /* trigger the next cmd */
366 atomic_set(&ndev->cmd_cnt, 1);
367 if (!skb_queue_empty(&ndev->cmd_q))
368 queue_work(ndev->cmd_wq, &ndev->cmd_work);
369 }
370
