summaryrefslogtreecommitdiff
path: root/drivers/nfc/nfcwilink.c
blob: 90af28d611f66b71292af451577fc43d33082b69 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
/*
 *  Texas Instrument's NFC Driver For Shared Transport.
 *
 *  NFC Driver acts as interface between NCI core and
 *  TI Shared Transport Layer.
 *
 *  Copyright (C) 2011 Texas Instruments, Inc.
 *
 *  Written by Ilan Elias <ilane@ti.com>
 *
 *  Acknowledgements:
 *  This file is based on btwilink.c, which was written
 *  by Raja Mani and Pavan Savoy.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/firmware.h>
#include <linux/nfc.h>
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include <linux/ti_wilink_st.h>

#define NFCWILINK_CHNL			12
#define NFCWILINK_OPCODE		7
#define NFCWILINK_MAX_FRAME_SIZE	300
#define NFCWILINK_HDR_LEN		4
#define NFCWILINK_OFFSET_LEN_IN_HDR	1
#define NFCWILINK_LEN_SIZE		2
#define NFCWILINK_REGISTER_TIMEOUT	8000	/* 8 sec */
#define NFCWILINK_CMD_TIMEOUT		5000	/* 5 sec */

#define BTS_FILE_NAME_MAX_SIZE		40
#define BTS_FILE_HDR_MAGIC		0x42535442
#define BTS_FILE_CMD_MAX_LEN		0xff
#define BTS_FILE_ACTION_TYPE_SEND_CMD	1

#define NCI_VS_NFCC_INFO_CMD_GID	0x2f
#define NCI_VS_NFCC_INFO_CMD_OID	0x12
#define NCI_VS_NFCC_INFO_RSP_GID	0x4f
#define NCI_VS_NFCC_INFO_RSP_OID	0x12

struct nfcwilink_hdr {
	__u8 chnl;
	__u8 opcode;
	__le16 len;
} __packed;

struct nci_vs_nfcc_info_cmd {
	__u8 gid;
	__u8 oid;
	__u8 plen;
} __packed;

struct nci_vs_nfcc_info_rsp {
	__u8 gid;
	__u8 oid;
	__u8 plen;
	__u8 status;
	__u8 hw_id;
	__u8 sw_ver_x;
	__u8 sw_ver_z;
	__u8 patch_id;
} __packed;

struct bts_file_hdr {
	__le32 magic;
	__le32 ver;
	__u8 rfu[24];
	__u8 actions[0];
} __packed;

struct bts_file_action {
	__le16 type;
	__le16 len;
	__u8 data[0];
} __packed;

struct nfcwilink {
	struct platform_device		*pdev;
	struct nci_dev			*ndev;
	unsigned long			flags;

	char				st_register_cb_status;
	long				(*st_write) (struct sk_buff *);

	struct completion		completed;

	struct nci_vs_nfcc_info_rsp	nfcc_info;
};

/* NFCWILINK driver flags */
enum {
	NFCWILINK_RUNNING,
	NFCWILINK_FW_DOWNLOAD,
};

static int nfcwilink_send(struct sk_buff *skb);

static inline struct sk_buff *nfcwilink_skb_alloc(unsigned int len, gfp_t how)
{
	struct sk_buff *skb;

	skb = alloc_skb(len + NFCWILINK_HDR_LEN, how);
	if (skb)
		skb_reserve(skb, NFCWILINK_HDR_LEN);

	return skb;
}

static void nfcwilink_fw_download_receive(struct nfcwilink *drv,
						struct sk_buff *skb)
{
	struct nci_vs_nfcc_info_rsp *rsp = (void *)skb->data;

	/* Detect NCI_VS_NFCC_INFO_RSP and store the result */
	if ((skb->len > 3) && (rsp->gid == NCI_VS_NFCC_INFO_RSP_GID) &&
		(rsp->oid == NCI_VS_NFCC_INFO_RSP_OID)) {
		memcpy(&drv->nfcc_info, rsp,
			sizeof(struct nci_vs_nfcc_info_rsp));
	}

	kfree_skb(skb);

	complete(&drv->completed);
}

static int nfcwilink_get_bts_file_name(struct nfcwilink *drv, char *file_name)
{
	struct nci_vs_nfcc_info_cmd *cmd;
	struct sk_buff *skb;
	unsigned long comp_ret;
	int rc;

	nfc_dev_dbg(&drv->pdev->dev, "get_bts_file_name entry");

	skb = nfcwilink_skb_alloc(sizeof(struct nci_vs_nfcc_info_cmd),
					GFP_KERNEL);
	if (!skb) {
		nfc_dev_err(&drv->pdev->dev,
				"no memory for nci_vs_nfcc_info_cmd");
		return -ENOMEM;
	}

	skb->dev = (void *)drv->ndev;

	cmd = (struct nci_vs_nfcc_info_cmd *)
			skb_put(skb, sizeof(struct nci_vs_nfcc_info_cmd));
	cmd->gid = NCI_VS_NFCC_INFO_CMD_GID;
	cmd->oid = NCI_VS_NFCC_INFO_CMD_OID;
	cmd->plen = 0;

	drv->nfcc_info.plen = 0;

	rc = nfcwilink_send(skb);
	if (rc)
		return rc;

	comp_ret = wait_for_completion_timeout(&drv->completed,
				msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
	nfc_dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld",
			comp_ret);
	if (comp_ret == 0) {
		nfc_dev_err(&drv->pdev->dev,
				"timeout on wait_for_completion_timeout");
		return -ETIMEDOUT;
	}

	nfc_dev_dbg(&drv->pdev->dev, "nci_vs_nfcc_info_rsp: plen %d, status %d",
			drv->nfcc_info.plen,
			drv->nfcc_info.status);

	if ((drv->nfcc_info.plen != 5) || (drv->nfcc_info.status != 0)) {
		nfc_dev_err(&drv->pdev->dev,
				"invalid nci_vs_nfcc_info_rsp");
		return -EINVAL;
	}

	snprintf(file_name, BTS_FILE_NAME_MAX_SIZE,
			"TINfcInit_%d.%d.%d.%d.bts",
			drv->nfcc_info.hw_id,
			drv->nfcc_info.sw_ver_x,
			drv->nfcc_info.sw_ver_z,
			drv->nfcc_info.patch_id);

	nfc_dev_info(&drv->pdev->dev, "nfcwilink FW file name: %s", file_name);

	return 0;
}

static int nfcwilink_send_bts_cmd(struct nfcwilink *drv, __u8 *data, int len)
{
	struct nfcwilink_hdr *hdr = (struct nfcwilink_hdr *)data;
	struct sk_buff *skb;
	unsigned long comp_ret;
	int rc;

	nfc_dev_dbg(&drv->pdev->dev, "send_bts_cmd entry");

	/* verify valid cmd for the NFC channel */
	if ((len <= sizeof(struct nfcwilink_hdr)) ||
		(len > BTS_FILE_CMD_MAX_LEN) ||
		(hdr->chnl != NFCWILINK_CHNL) ||
		(hdr->opcode != NFCWILINK_OPCODE)) {
		nfc_dev_err(&drv->pdev->dev,
			"ignoring invalid bts cmd, len %d, chnl %d, opcode %d",
			len, hdr->chnl, hdr->opcode);
		return 0;
	}

	/* remove the ST header */
	len -= sizeof(struct nfcwilink_hdr);
	data += sizeof(struct nfcwilink_hdr);

	skb = nfcwilink_skb_alloc(len, GFP_KERNEL);
	if (!skb) {
		nfc_dev_err(&drv->pdev->dev, "no memory for bts cmd");
		return -ENOMEM;
	}

	skb->dev = (void *)drv->ndev;

	memcpy(skb_put(skb, len), data, len);

	rc = nfcwilink_send(skb);
	if (rc)
		return rc;

	comp_ret = wait_for_completion_timeout(&drv->completed,
				msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
	nfc_dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld",
			comp_ret);
	if (comp_ret == 0) {
		nfc_dev_err(&drv->pdev->dev,
				"timeout on wait_for_completion_timeout");
		return -ETIMEDOUT;
	}

	return 0;
}

static int nfcwilink_download_fw(struct nfcwilink *drv)
{
	unsigned char file_name[BTS_FILE_NAME_MAX_SIZE];
	const struct firmware *fw;
	__u16 action_type, action_len;
	__u8 *ptr;
	int len, rc;

	nfc_dev_dbg(&drv->pdev->dev, "download_fw entry");

	set_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);

	rc = nfcwilink_get_bts_file_name(drv, file_name);
	if (rc)
		goto exit;

	rc = request_firmware(&fw, file_name, &drv->pdev->dev);
	if (rc) {
		nfc_dev_err(&drv->pdev->dev, "request_firmware failed %d", rc);

		/* if the file is not found, don't exit with failure */
		if (rc == -ENOENT)
			rc = 0;

		goto exit;
	}

	len = fw->size;
	ptr = (__u8 *)fw->data;

	if ((len == 0) || (ptr == NULL)) {
		nfc_dev_dbg(&drv->pdev->dev,
				"request_firmware returned size %d", len);
		goto release_fw;
	}

	if (__le32_to_cpu(((struct bts_file_hdr *)ptr)->magic) !=
			BTS_FILE_HDR_MAGIC) {
		nfc_dev_err(&drv->pdev->dev, "wrong bts magic number");
		rc = -EINVAL;
		goto release_fw;
	}

	/* remove the BTS header */
	len -= sizeof(struct bts_file_hdr);
	ptr += sizeof(struct bts_file_hdr);

	while (len > 0) {
		action_type =
			__le16_to_cpu(((struct bts_file_action *)ptr)->type);
		action_len =
			__le16_to_cpu(((struct bts_file_action *)ptr)->len);

		nfc_dev_dbg(&drv->pdev->dev, "bts_file_action type %d, len %d",
				action_type, action_len);

		switch (action_type) {
		case BTS_FILE_ACTION_TYPE_SEND_CMD:
			rc = nfcwilink_send_bts_cmd(drv,
					((struct bts_file_action *)ptr)->data,
					action_len);
			if (rc)
				goto release_fw;
			break;
		}

		/* advance to the next action */
		len -= (sizeof(struct bts_file_action) + action_len);
		ptr += (sizeof(struct bts_file_action) + action_len);
	}

release_fw:
	release_firmware(fw);

exit:
	clear_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);
	return rc;
}

/* Called by ST when registration is complete */
static void nfcwilink_register_complete(void *priv_data, char data)
{
	struct nfcwilink *drv = priv_data;

	nfc_dev_dbg(&drv->pdev->dev, "register_complete entry");

	/* store ST registration status */
	drv->st_register_cb_status = data;

	/* complete the wait in nfc_st_open() */
	complete(&drv->completed);
}

/* Called by ST when receive data is available */
static long nfcwilink_receive(void *priv_data, struct sk_buff *skb)
{
	struct nfcwilink *drv = priv_data;
	int rc;

	nfc_dev_dbg(&drv->pdev->dev, "receive entry, len %d", skb->len);

	if (!skb)
		return -EFAULT;

	if (!drv) {
		kfree_skb(skb);
		return -EFAULT;
	}

	/* strip the ST header
	(apart for the chnl byte, which is not received in the hdr) */
	skb_pull(skb, (NFCWILINK_HDR_LEN-1));

	if (test_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags)) {
		nfcwilink_fw_download_receive(drv, skb);
		return 0;
	}

	skb->dev = (void *) drv->ndev;

	/* Forward skb to NCI core layer */
	rc = nci_recv_frame(skb);
	if (rc < 0) {
		nfc_dev_err(&drv->pdev->dev, "nci_recv_frame failed %d", rc);
		return rc;
	}

	return 0;
}

/* protocol structure registered with ST */
static struct st_proto_s nfcwilink_proto = {
	.chnl_id = NFCWILINK_CHNL,
	.max_frame_size = NFCWILINK_MAX_FRAME_SIZE,
	.hdr_len = (NFCWILINK_HDR_LEN-1),	/* not including chnl byte */
	.offset_len_in_hdr = NFCWILINK_OFFSET_LEN_IN_HDR,
	.len_size = NFCWILINK_LEN_SIZE,
	.reserve = 0,
	.recv = nfcwilink_receive,
	.reg_complete_cb = nfcwilink_register_complete,
	.write = NULL,
};

static int nfcwilink_open(struct nci_dev *ndev)
{
	struct nfcwilink *drv = nci_get_drvdata(ndev);
	unsigned long comp_ret;
	int rc;

	nfc_dev_dbg(&drv->pdev->dev, "open entry");

	if (test_and_set_bit(NFCWILINK_RUNNING, &drv->flags)) {
		rc = -EBUSY;
		goto exit;
	}

	nfcwilink_proto.priv_data = drv;

	init_completion(&drv->completed);
	drv->st_register_cb_status = -EINPROGRESS;

	rc = st_register(&nfcwilink_proto);
	if (rc < 0) {
		if (rc == -EINPROGRESS) {
			comp_ret = wait_for_completion_timeout(
			&drv->completed,
			msecs_to_jiffies(NFCWILINK_REGISTER_TIMEOUT));

			nfc_dev_dbg(&drv->pdev->dev,
			"wait_for_completion_timeout returned %ld",
			comp_ret);

			if (comp_ret == 0) {
				/* timeout */
				rc = -ETIMEDOUT;
				goto clear_exit;
			} else if (drv->st_register_cb_status != 0) {
				rc = drv->st_register_cb_status;
				nfc_dev_err(&drv->pdev->dev,
				"st_register_cb failed %d", rc);
				goto clear_exit;
			}
		} else {
			nfc_dev_err(&drv->pdev->dev,
				"st_register failed %d", rc);
			goto clear_exit;
		}
	}

	/* st_register MUST fill the write callback */
	BUG_ON(nfcwilink_proto.write == NULL);
	drv->st_write = nfcwilink_proto.write;

	if (nfcwilink_download_fw(drv)) {
		nfc_dev_err(&drv->pdev->dev, "nfcwilink_download_fw failed %d",
				rc);
		/* open should succeed, even if the FW download failed */
	}

	goto exit;

clear_exit:
	clear_bit(NFCWILINK_RUNNING, &drv->flags);

exit:
	return rc;
}

static int nfcwilink_close(struct nci_dev *ndev)
{
	struct nfcwilink *drv = nci_get_drvdata(ndev);
	int rc;

	nfc_dev_dbg(&drv->pdev->dev, "close entry");

	if (!test_and_clear_bit(NFCWILINK_RUNNING, &drv->flags))
		return 0;

	rc = st_unregister(&nfcwilink_proto);
	if (rc)
		nfc_dev_err(&drv->pdev->dev, "st_unregister failed %d", rc);

	drv->st_write = NULL;

	return rc;
}

static int nfcwilink_send(struct sk_buff *skb)
{
	struct nci_dev *ndev = (struct nci_dev *)skb->dev;
	struct nfcwilink *drv = nci_get_drvdata(ndev);
	struct nfcwilink_hdr hdr = {NFCWILINK_CHNL, NFCWILINK_OPCODE, 0x0000};
	long len;

	nfc_dev_dbg(&drv->pdev->dev, "send entry, len %d", skb->len);

	if (!test_bit(NFCWILINK_RUNNING, &drv->flags))
		return -EBUSY;

	/* add the ST hdr to the start of the buffer */
	hdr.len = cpu_to_le16(skb->len);
	memcpy(skb_push(skb, NFCWILINK_HDR_LEN), &hdr, NFCWILINK_HDR_LEN);

	/* Insert skb to shared transport layer's transmit queue.
	 * Freeing skb memory is taken care in shared transport layer,
	 * so don't free skb memory here.
	 */
	len = drv->st_write(skb);
	if (len < 0) {
		kfree_skb(skb);
		nfc_dev_err(&drv->pdev->dev, "st_write failed %ld", len);
		return -EFAULT;
	}

	return 0;
}

static struct nci_ops nfcwilink_ops = {
	.open = nfcwilink_open,
	.close = nfcwilink_close,
	.send = nfcwilink_send,
};

static int nfcwilink_probe(struct platform_device *pdev)
{
	static struct nfcwilink *drv;
	int rc;
	__u32 protocols;

	nfc_dev_dbg(&pdev->dev, "probe entry");

	drv = kzalloc(sizeof(struct nfcwilink), GFP_KERNEL);
	if (!drv) {
		rc = -ENOMEM;
		goto exit;
	}

	drv->pdev = pdev;

	protocols = NFC_PROTO_JEWEL_MASK
			| NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK
			| NFC_PROTO_ISO14443_MASK
			| NFC_PROTO_NFC_DEP_MASK;

	drv->ndev = nci_allocate_device(&nfcwilink_ops,
					protocols,
					NFCWILINK_HDR_LEN,
					0);
	if (!drv->ndev) {
		nfc_dev_err(&pdev->dev, "nci_allocate_device failed");
		rc = -ENOMEM;
		goto free_exit;
	}

	nci_set_parent_dev(drv->ndev, &pdev->dev);
	nci_set_drvdata(drv->ndev, drv);

	rc = nci_register_device(drv->ndev);
	if (rc < 0) {
		nfc_dev_err(&pdev->dev, "nci_register_device failed %d", rc);
		goto free_dev_exit;
	}

	dev_set_drvdata(&pdev->dev, drv);

	goto exit;

free_dev_exit:
	nci_free_device(drv->ndev);

free_exit:
	kfree(drv);

exit:
	return rc;
}

static int nfcwilink_remove(struct platform_device *pdev)
{
	struct nfcwilink *drv = dev_get_drvdata(&pdev->dev);
	struct nci_dev *ndev;

	nfc_dev_dbg(&pdev->dev, "remove entry");

	if (!drv)
		return -EFAULT;

	ndev = drv->ndev;

	nci_unregister_device(ndev);
	nci_free_device(ndev);

	kfree(drv);

	dev_set_drvdata(&pdev->dev, NULL);

	return 0;
}

static struct platform_driver nfcwilink_driver = {
	.probe = nfcwilink_probe,
	.remove = nfcwilink_remove,
	.driver = {
		.name = "nfcwilink",
		.owner = THIS_MODULE,
	},
};

/* ------- Module Init/Exit interfaces ------ */
static int __init nfcwilink_init(void)
{
	printk(KERN_INFO "NFC Driver for TI WiLink");

	return platform_driver_register(&nfcwilink_driver);
}

static void __exit nfcwilink_exit(void)
{
	platform_driver_unregister(&nfcwilink_driver);
}

module_init(nfcwilink_init);
module_exit(nfcwilink_exit);

/* ------ Module Info ------ */

MODULE_AUTHOR("Ilan Elias <ilane@ti.com>");
MODULE_DESCRIPTION("NFC Driver for TI Shared Transport");
MODULE_LICENSE("GPL");