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arch/sparc/kernel/sys_sparc_64.c: s/COLOUR/COLOR/
[linux-2.6.git] / drivers / nfc / pn544_hci.c
blobc9c8570273ab5a58c782e9fe953339e091042d2a
1 /*
2 * HCI based Driver for NXP PN544 NFC Chip
3 *
4 * Copyright (C) 2012 Intel Corporation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the
17 * Free Software Foundation, Inc.,
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21 #include <linux/crc-ccitt.h>
22 #include <linux/module.h>
23 #include <linux/delay.h>
24 #include <linux/slab.h>
25 #include <linux/miscdevice.h>
26 #include <linux/interrupt.h>
27 #include <linux/gpio.h>
28 #include <linux/i2c.h>
29
30 #include <linux/nfc.h>
31 #include <net/nfc/hci.h>
32 #include <net/nfc/llc.h>
33
34 #include <linux/nfc/pn544.h>
35
36 #define DRIVER_DESC "HCI NFC driver for PN544"
37
38 #define PN544_HCI_DRIVER_NAME "pn544_hci"
39
40 /* Timing restrictions (ms) */
41 #define PN544_HCI_RESETVEN_TIME 30
42
43 static struct i2c_device_id pn544_hci_id_table[] = {
44 {"pn544", 0},
45 {}
46 };
47
48 MODULE_DEVICE_TABLE(i2c, pn544_hci_id_table);
49
50 #define HCI_MODE 0
51 #define FW_MODE 1
52
53 /* framing in HCI mode */
54 #define PN544_HCI_LLC_LEN 1
55 #define PN544_HCI_LLC_CRC 2
56 #define PN544_HCI_LLC_LEN_CRC (PN544_HCI_LLC_LEN + PN544_HCI_LLC_CRC)
57 #define PN544_HCI_LLC_MIN_SIZE (1 + PN544_HCI_LLC_LEN_CRC)
58 #define PN544_HCI_LLC_MAX_PAYLOAD 29
59 #define PN544_HCI_LLC_MAX_SIZE (PN544_HCI_LLC_LEN_CRC + 1 + \
60 PN544_HCI_LLC_MAX_PAYLOAD)
61
62 enum pn544_state {
63 PN544_ST_COLD,
64 PN544_ST_FW_READY,
65 PN544_ST_READY,
66 };
67
68 #define FULL_VERSION_LEN 11
69
70 /* Proprietary commands */
71 #define PN544_WRITE 0x3f
72
73 /* Proprietary gates, events, commands and registers */
74
75 /* NFC_HCI_RF_READER_A_GATE additional registers and commands */
76 #define PN544_RF_READER_A_AUTO_ACTIVATION 0x10
77 #define PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION 0x12
78 #define PN544_MIFARE_CMD 0x21
79
80 /* Commands that apply to all RF readers */
81 #define PN544_RF_READER_CMD_PRESENCE_CHECK 0x30
82 #define PN544_RF_READER_CMD_ACTIVATE_NEXT 0x32
83
84 /* NFC_HCI_ID_MGMT_GATE additional registers */
85 #define PN544_ID_MGMT_FULL_VERSION_SW 0x10
86
87 #define PN544_RF_READER_ISO15693_GATE 0x12
88
89 #define PN544_RF_READER_F_GATE 0x14
90 #define PN544_FELICA_ID 0x04
91 #define PN544_FELICA_RAW 0x20
92
93 #define PN544_RF_READER_JEWEL_GATE 0x15
94 #define PN544_JEWEL_RAW_CMD 0x23
95
96 #define PN544_RF_READER_NFCIP1_INITIATOR_GATE 0x30
97 #define PN544_RF_READER_NFCIP1_TARGET_GATE 0x31
98
99 #define PN544_SYS_MGMT_GATE 0x90
100 #define PN544_SYS_MGMT_INFO_NOTIFICATION 0x02
101
102 #define PN544_POLLING_LOOP_MGMT_GATE 0x94
103 #define PN544_PL_RDPHASES 0x06
104 #define PN544_PL_EMULATION 0x07
105 #define PN544_PL_NFCT_DEACTIVATED 0x09
106
107 #define PN544_SWP_MGMT_GATE 0xA0
108
109 #define PN544_NFC_WI_MGMT_GATE 0xA1
110
111 static struct nfc_hci_gate pn544_gates[] = {
112 {NFC_HCI_ADMIN_GATE, NFC_HCI_INVALID_PIPE},
113 {NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE},
114 {NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_PIPE},
115 {NFC_HCI_LINK_MGMT_GATE, NFC_HCI_INVALID_PIPE},
116 {NFC_HCI_RF_READER_B_GATE, NFC_HCI_INVALID_PIPE},
117 {NFC_HCI_RF_READER_A_GATE, NFC_HCI_INVALID_PIPE},
118 {PN544_SYS_MGMT_GATE, NFC_HCI_INVALID_PIPE},
119 {PN544_SWP_MGMT_GATE, NFC_HCI_INVALID_PIPE},
120 {PN544_POLLING_LOOP_MGMT_GATE, NFC_HCI_INVALID_PIPE},
121 {PN544_NFC_WI_MGMT_GATE, NFC_HCI_INVALID_PIPE},
122 {PN544_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE},
123 {PN544_RF_READER_JEWEL_GATE, NFC_HCI_INVALID_PIPE},
124 {PN544_RF_READER_ISO15693_GATE, NFC_HCI_INVALID_PIPE},
125 {PN544_RF_READER_NFCIP1_INITIATOR_GATE, NFC_HCI_INVALID_PIPE},
126 {PN544_RF_READER_NFCIP1_TARGET_GATE, NFC_HCI_INVALID_PIPE}
127 };
128
129 /* Largest headroom needed for outgoing custom commands */
130 #define PN544_CMDS_HEADROOM 2
131 #define PN544_FRAME_HEADROOM 1
132 #define PN544_FRAME_TAILROOM 2
133
134 struct pn544_hci_info {
135 struct i2c_client *i2c_dev;
136 struct nfc_hci_dev *hdev;
137
138 enum pn544_state state;
139
140 struct mutex info_lock;
141
142 unsigned int gpio_en;
143 unsigned int gpio_irq;
144 unsigned int gpio_fw;
145 unsigned int en_polarity;
146
147 int hard_fault; /*
148 * < 0 if hardware error occured (e.g. i2c err)
149 * and prevents normal operation.
150 */
151 int async_cb_type;
152 data_exchange_cb_t async_cb;
153 void *async_cb_context;
154 };
155
156 static void pn544_hci_platform_init(struct pn544_hci_info *info)
157 {
158 int polarity, retry, ret;
159 char rset_cmd[] = { 0x05, 0xF9, 0x04, 0x00, 0xC3, 0xE5 };
160 int count = sizeof(rset_cmd);
161
162 pr_info(DRIVER_DESC ": %s\n", __func__);
163 dev_info(&info->i2c_dev->dev, "Detecting nfc_en polarity\n");
164
165 /* Disable fw download */
166 gpio_set_value(info->gpio_fw, 0);
167
168 for (polarity = 0; polarity < 2; polarity++) {
169 info->en_polarity = polarity;
170 retry = 3;
171 while (retry--) {
172 /* power off */
173 gpio_set_value(info->gpio_en, !info->en_polarity);
174 usleep_range(10000, 15000);
175
176 /* power on */
177 gpio_set_value(info->gpio_en, info->en_polarity);
178 usleep_range(10000, 15000);
179
180 /* send reset */
181 dev_dbg(&info->i2c_dev->dev, "Sending reset cmd\n");
182 ret = i2c_master_send(info->i2c_dev, rset_cmd, count);
183 if (ret == count) {
184 dev_info(&info->i2c_dev->dev,
185 "nfc_en polarity : active %s\n",
186 (polarity == 0 ? "low" : "high"));
187 goto out;
188 }
189 }
190 }
191
192 dev_err(&info->i2c_dev->dev,
193 "Could not detect nfc_en polarity, fallback to active high\n");
194
195 out:
196 gpio_set_value(info->gpio_en, !info->en_polarity);
197 }
198
199 static int pn544_hci_enable(struct pn544_hci_info *info, int mode)
200 {
201 pr_info(DRIVER_DESC ": %s\n", __func__);
202
203 gpio_set_value(info->gpio_fw, 0);
204 gpio_set_value(info->gpio_en, info->en_polarity);
205 usleep_range(10000, 15000);
206
207 return 0;
208 }
209
210 static void pn544_hci_disable(struct pn544_hci_info *info)
211 {
212 pr_info(DRIVER_DESC ": %s\n", __func__);
213
214 gpio_set_value(info->gpio_fw, 0);
215 gpio_set_value(info->gpio_en, !info->en_polarity);
216 usleep_range(10000, 15000);
217
218 gpio_set_value(info->gpio_en, info->en_polarity);
219 usleep_range(10000, 15000);
220
221 gpio_set_value(info->gpio_en, !info->en_polarity);
222 usleep_range(10000, 15000);
223 }
224
225 static int pn544_hci_i2c_write(struct i2c_client *client, u8 *buf, int len)
226 {
227 int r;
228
229 usleep_range(3000, 6000);
230
231 r = i2c_master_send(client, buf, len);
232
233 if (r == -EREMOTEIO) { /* Retry, chip was in standby */
234 usleep_range(6000, 10000);
235 r = i2c_master_send(client, buf, len);
236 }
237
238 if (r >= 0) {
239 if (r != len)
240 return -EREMOTEIO;
241 else
242 return 0;
243 }
244
245 return r;
246 }
247
248 static int check_crc(u8 *buf, int buflen)
249 {
250 int len;
251 u16 crc;
252
253 len = buf[0] + 1;
254 crc = crc_ccitt(0xffff, buf, len - 2);
255 crc = ~crc;
256
257 if (buf[len - 2] != (crc & 0xff) || buf[len - 1] != (crc >> 8)) {
258 pr_err(PN544_HCI_DRIVER_NAME ": CRC error 0x%x != 0x%x 0x%x\n",
259 crc, buf[len - 1], buf[len - 2]);
260
261 pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__);
262 print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
263 16, 2, buf, buflen, false);
264 return -EPERM;
265 }
266 return 0;
267 }
268
269 /*
270 * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees
271 * that i2c bus will be flushed and that next read will start on a new frame.
272 * returned skb contains only LLC header and payload.
273 * returns:
274 * -EREMOTEIO : i2c read error (fatal)
275 * -EBADMSG : frame was incorrect and discarded
276 * -ENOMEM : cannot allocate skb, frame dropped
277 */
278 static int pn544_hci_i2c_read(struct i2c_client *client, struct sk_buff **skb)
279 {
280 int r;
281 u8 len;
282 u8 tmp[PN544_HCI_LLC_MAX_SIZE - 1];
283
284 r = i2c_master_recv(client, &len, 1);
285 if (r != 1) {
286 dev_err(&client->dev, "cannot read len byte\n");
287 return -EREMOTEIO;
288 }
289
290 if ((len < (PN544_HCI_LLC_MIN_SIZE - 1)) ||
291 (len > (PN544_HCI_LLC_MAX_SIZE - 1))) {
292 dev_err(&client->dev, "invalid len byte\n");
293 r = -EBADMSG;
294 goto flush;
295 }
296
297 *skb = alloc_skb(1 + len, GFP_KERNEL);
298 if (*skb == NULL) {
299 r = -ENOMEM;
300 goto flush;
301 }
302
303 *skb_put(*skb, 1) = len;
304
305 r = i2c_master_recv(client, skb_put(*skb, len), len);
306 if (r != len) {
307 kfree_skb(*skb);
308 return -EREMOTEIO;
309 }
310
311 r = check_crc((*skb)->data, (*skb)->len);
312 if (r != 0) {
313 kfree_skb(*skb);
314 r = -EBADMSG;
315 goto flush;
316 }
317
318 skb_pull(*skb, 1);
319 skb_trim(*skb, (*skb)->len - 2);
320
321 usleep_range(3000, 6000);
322
323 return 0;
324
325 flush:
326 if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
327 r = -EREMOTEIO;
328
329 usleep_range(3000, 6000);
330
331 return r;
332 }
333
334 /*
335 * Reads an shdlc frame from the chip. This is not as straightforward as it
336 * seems. There are cases where we could loose the frame start synchronization.
337 * The frame format is len-data-crc, and corruption can occur anywhere while
338 * transiting on i2c bus, such that we could read an invalid len.
339 * In order to recover synchronization with the next frame, we must be sure
340 * to read the real amount of data without using the len byte. We do this by
341 * assuming the following:
342 * - the chip will always present only one single complete frame on the bus
343 * before triggering the interrupt
344 * - the chip will not present a new frame until we have completely read
345 * the previous one (or until we have handled the interrupt).
346 * The tricky case is when we read a corrupted len that is less than the real
347 * len. We must detect this here in order to determine that we need to flush
348 * the bus. This is the reason why we check the crc here.
349 */
350 static irqreturn_t pn544_hci_irq_thread_fn(int irq, void *dev_id)
351 {
352 struct pn544_hci_info *info = dev_id;
353 struct i2c_client *client;
354 struct sk_buff *skb = NULL;
355 int r;
356
357 if (!info || irq != info->i2c_dev->irq) {
358 WARN_ON_ONCE(1);
359 return IRQ_NONE;
360 }
361
362 client = info->i2c_dev;
363 dev_dbg(&client->dev, "IRQ\n");
364
365 if (info->hard_fault != 0)
366 return IRQ_HANDLED;
367
368 r = pn544_hci_i2c_read(client, &skb);
369 if (r == -EREMOTEIO) {
370 info->hard_fault = r;
371
372 nfc_hci_recv_frame(info->hdev, NULL);
373
374 return IRQ_HANDLED;
375 } else if ((r == -ENOMEM) || (r == -EBADMSG)) {
376 return IRQ_HANDLED;
377 }
378
379 nfc_hci_recv_frame(info->hdev, skb);
380
381 return IRQ_HANDLED;
382 }
383
384 static int pn544_hci_open(struct nfc_hci_dev *hdev)
385 {
386 struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
387 int r = 0;
388
389 mutex_lock(&info->info_lock);
390
391 if (info->state != PN544_ST_COLD) {
392 r = -EBUSY;
393 goto out;
394 }
395
396 r = pn544_hci_enable(info, HCI_MODE);
397
398 if (r == 0)
399 info->state = PN544_ST_READY;
400
401 out:
402 mutex_unlock(&info->info_lock);
403 return r;
404 }
405
406 static void pn544_hci_close(struct nfc_hci_dev *hdev)
407 {
408 struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
409
410 mutex_lock(&info->info_lock);
411
412 if (info->state == PN544_ST_COLD)
413 goto out;
414
415 pn544_hci_disable(info);
416
417 info->state = PN544_ST_COLD;
418
419 out:
420 mutex_unlock(&info->info_lock);
421 }
422
423 static int pn544_hci_ready(struct nfc_hci_dev *hdev)
424 {
425 struct sk_buff *skb;
426 static struct hw_config {
427 u8 adr[2];
428 u8 value;
429 } hw_config[] = {
430 {{0x9f, 0x9a}, 0x00},
431
432 {{0x98, 0x10}, 0xbc},
433
434 {{0x9e, 0x71}, 0x00},
435
436 {{0x98, 0x09}, 0x00},
437
438 {{0x9e, 0xb4}, 0x00},
439
440 {{0x9e, 0xd9}, 0xff},
441 {{0x9e, 0xda}, 0xff},
442 {{0x9e, 0xdb}, 0x23},
443 {{0x9e, 0xdc}, 0x21},
444 {{0x9e, 0xdd}, 0x22},
445 {{0x9e, 0xde}, 0x24},
446
447 {{0x9c, 0x01}, 0x08},
448
449 {{0x9e, 0xaa}, 0x01},
450
451 {{0x9b, 0xd1}, 0x0d},
452 {{0x9b, 0xd2}, 0x24},
453 {{0x9b, 0xd3}, 0x0a},
454 {{0x9b, 0xd4}, 0x22},
455 {{0x9b, 0xd5}, 0x08},
456 {{0x9b, 0xd6}, 0x1e},
457 {{0x9b, 0xdd}, 0x1c},
458
459 {{0x9b, 0x84}, 0x13},
460 {{0x99, 0x81}, 0x7f},
461 {{0x99, 0x31}, 0x70},
462
463 {{0x98, 0x00}, 0x3f},
464
465 {{0x9f, 0x09}, 0x00},
466
467 {{0x9f, 0x0a}, 0x05},
468
469 {{0x9e, 0xd1}, 0xa1},
470 {{0x99, 0x23}, 0x00},
471
472 {{0x9e, 0x74}, 0x80},
473
474 {{0x9f, 0x28}, 0x10},
475
476 {{0x9f, 0x35}, 0x14},
477
478 {{0x9f, 0x36}, 0x60},
479
480 {{0x9c, 0x31}, 0x00},
481
482 {{0x9c, 0x32}, 0xc8},
483
484 {{0x9c, 0x19}, 0x40},
485
486 {{0x9c, 0x1a}, 0x40},
487
488 {{0x9c, 0x0c}, 0x00},
489
490 {{0x9c, 0x0d}, 0x00},
491
492 {{0x9c, 0x12}, 0x00},
493
494 {{0x9c, 0x13}, 0x00},
495
496 {{0x98, 0xa2}, 0x0e},
497
498 {{0x98, 0x93}, 0x40},
499
500 {{0x98, 0x7d}, 0x02},
501 {{0x98, 0x7e}, 0x00},
502 {{0x9f, 0xc8}, 0x01},
503 };
504 struct hw_config *p = hw_config;
505 int count = ARRAY_SIZE(hw_config);
506 struct sk_buff *res_skb;
507 u8 param[4];
508 int r;
509
510 param[0] = 0;
511 while (count--) {
512 param[1] = p->adr[0];
513 param[2] = p->adr[1];
514 param[3] = p->value;
515
516 r = nfc_hci_send_cmd(hdev, PN544_SYS_MGMT_GATE, PN544_WRITE,
517 param, 4, &res_skb);
518 if (r < 0)
519 return r;
520
521 if (res_skb->len != 1) {
522 kfree_skb(res_skb);
523 return -EPROTO;
524 }
525
526 if (res_skb->data[0] != p->value) {
527 kfree_skb(res_skb);
528 return -EIO;
529 }
530
531 kfree_skb(res_skb);
532
533 p++;
534 }
535
536 param[0] = NFC_HCI_UICC_HOST_ID;
537 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
538 NFC_HCI_ADMIN_WHITELIST, param, 1);
539 if (r < 0)
540 return r;
541
542 param[0] = 0x3d;
543 r = nfc_hci_set_param(hdev, PN544_SYS_MGMT_GATE,
544 PN544_SYS_MGMT_INFO_NOTIFICATION, param, 1);
545 if (r < 0)
546 return r;
547
548 param[0] = 0x0;
549 r = nfc_hci_set_param(hdev, NFC_HCI_RF_READER_A_GATE,
550 PN544_RF_READER_A_AUTO_ACTIVATION, param, 1);
551 if (r < 0)
552 return r;
553
554 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
555 NFC_HCI_EVT_END_OPERATION, NULL, 0);
556 if (r < 0)
557 return r;
558
559 param[0] = 0x1;
560 r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
561 PN544_PL_NFCT_DEACTIVATED, param, 1);
562 if (r < 0)
563 return r;
564
565 param[0] = 0x0;
566 r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
567 PN544_PL_RDPHASES, param, 1);
568 if (r < 0)
569 return r;
570
571 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
572 PN544_ID_MGMT_FULL_VERSION_SW, &skb);
573 if (r < 0)
574 return r;
575
576 if (skb->len != FULL_VERSION_LEN) {
577 kfree_skb(skb);
578 return -EINVAL;
579 }
580
581 print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
582 DUMP_PREFIX_NONE, 16, 1,
583 skb->data, FULL_VERSION_LEN, false);
584
585 kfree_skb(skb);
586
587 return 0;
588 }
589
590 static void pn544_hci_add_len_crc(struct sk_buff *skb)
591 {
592 u16 crc;
593 int len;
594
595 len = skb->len + 2;
596 *skb_push(skb, 1) = len;
597
598 crc = crc_ccitt(0xffff, skb->data, skb->len);
599 crc = ~crc;
600 *skb_put(skb, 1) = crc & 0xff;
601 *skb_put(skb, 1) = crc >> 8;
602 }
603
604 static void pn544_hci_remove_len_crc(struct sk_buff *skb)
605 {
606 skb_pull(skb, PN544_FRAME_HEADROOM);
607 skb_trim(skb, PN544_FRAME_TAILROOM);
608 }
609
610 static int pn544_hci_xmit(struct nfc_hci_dev *hdev, struct sk_buff *skb)
611 {
612 struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
613 struct i2c_client *client = info->i2c_dev;
614 int r;
615
616 if (info->hard_fault != 0)
617 return info->hard_fault;
618
619 pn544_hci_add_len_crc(skb);
620 r = pn544_hci_i2c_write(client, skb->data, skb->len);
621 pn544_hci_remove_len_crc(skb);
622
623 return r;
624 }
625
626 static int pn544_hci_start_poll(struct nfc_hci_dev *hdev,
627 u32 im_protocols, u32 tm_protocols)
628 {
629 u8 phases = 0;
630 int r;
631 u8 duration[2];
632 u8 activated;
633
634 pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n",
635 __func__, im_protocols, tm_protocols);
636
637 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
638 NFC_HCI_EVT_END_OPERATION, NULL, 0);
639 if (r < 0)
640 return r;
641
642 duration[0] = 0x18;
643 duration[1] = 0x6a;
644 r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
645 PN544_PL_EMULATION, duration, 2);
646 if (r < 0)
647 return r;
648
649 activated = 0;
650 r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
651 PN544_PL_NFCT_DEACTIVATED, &activated, 1);
652 if (r < 0)
653 return r;
654
655 if (im_protocols & (NFC_PROTO_ISO14443_MASK | NFC_PROTO_MIFARE_MASK |
656 NFC_PROTO_JEWEL_MASK))
657 phases |= 1; /* Type A */
658 if (im_protocols & NFC_PROTO_FELICA_MASK) {
659 phases |= (1 << 2); /* Type F 212 */
660 phases |= (1 << 3); /* Type F 424 */
661 }
662
663 phases |= (1 << 5); /* NFC active */
664
665 r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
666 PN544_PL_RDPHASES, &phases, 1);
667 if (r < 0)
668 return r;
669
670 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
671 NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
672 if (r < 0)
673 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
674 NFC_HCI_EVT_END_OPERATION, NULL, 0);
675
676 return r;
677 }
678
679 static int pn544_hci_target_from_gate(struct nfc_hci_dev *hdev, u8 gate,
680 struct nfc_target *target)
681 {
682 switch (gate) {
683 case PN544_RF_READER_F_GATE:
684 target->supported_protocols = NFC_PROTO_FELICA_MASK;
685 break;
686 case PN544_RF_READER_JEWEL_GATE:
687 target->supported_protocols = NFC_PROTO_JEWEL_MASK;
688 target->sens_res = 0x0c00;
689 break;
690 default:
691 return -EPROTO;
692 }
693
694 return 0;
695 }
696
697 static int pn544_hci_complete_target_discovered(struct nfc_hci_dev *hdev,
698 u8 gate,
699 struct nfc_target *target)
700 {
701 struct sk_buff *uid_skb;
702 int r = 0;
703
704 if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
705 if (target->nfcid1_len != 4 && target->nfcid1_len != 7 &&
706 target->nfcid1_len != 10)
707 return -EPROTO;
708
709 r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
710 PN544_RF_READER_CMD_ACTIVATE_NEXT,
711 target->nfcid1, target->nfcid1_len, NULL);
712 } else if (target->supported_protocols & NFC_PROTO_FELICA_MASK) {
713 r = nfc_hci_get_param(hdev, PN544_RF_READER_F_GATE,
714 PN544_FELICA_ID, &uid_skb);
715 if (r < 0)
716 return r;
717
718 if (uid_skb->len != 8) {
719 kfree_skb(uid_skb);
720 return -EPROTO;
721 }
722
723 r = nfc_hci_send_cmd(hdev, PN544_RF_READER_F_GATE,
724 PN544_RF_READER_CMD_ACTIVATE_NEXT,
725 uid_skb->data, uid_skb->len, NULL);
726 kfree_skb(uid_skb);
727 } else if (target->supported_protocols & NFC_PROTO_ISO14443_MASK) {
728 /*
729 * TODO: maybe other ISO 14443 require some kind of continue
730 * activation, but for now we've seen only this one below.
731 */
732 if (target->sens_res == 0x4403) /* Type 4 Mifare DESFire */
733 r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
734 PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION,
735 NULL, 0, NULL);
736 }
737
738 return r;
739 }
740
741 #define PN544_CB_TYPE_READER_F 1
742
743 static void pn544_hci_data_exchange_cb(void *context, struct sk_buff *skb,
744 int err)
745 {
746 struct pn544_hci_info *info = context;
747
748 switch (info->async_cb_type) {
749 case PN544_CB_TYPE_READER_F:
750 if (err == 0)
751 skb_pull(skb, 1);
752 info->async_cb(info->async_cb_context, skb, err);
753 break;
754 default:
755 if (err == 0)
756 kfree_skb(skb);
757 break;
758 }
759 }
760
761 #define MIFARE_CMD_AUTH_KEY_A 0x60
762 #define MIFARE_CMD_AUTH_KEY_B 0x61
763 #define MIFARE_CMD_HEADER 2
764 #define MIFARE_UID_LEN 4
765 #define MIFARE_KEY_LEN 6
766 #define MIFARE_CMD_LEN 12
767 /*
768 * Returns:
769 * <= 0: driver handled the data exchange
770 * 1: driver doesn't especially handle, please do standard processing
771 */
772 static int pn544_hci_data_exchange(struct nfc_hci_dev *hdev,
773 struct nfc_target *target,
774 struct sk_buff *skb, data_exchange_cb_t cb,
775 void *cb_context)
776 {
777 struct pn544_hci_info *info = nfc_hci_get_clientdata(hdev);
778
779 pr_info(DRIVER_DESC ": %s for gate=%d\n", __func__,
780 target->hci_reader_gate);
781
782 switch (target->hci_reader_gate) {
783 case NFC_HCI_RF_READER_A_GATE:
784 if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
785 /*
786 * It seems that pn544 is inverting key and UID for
787 * MIFARE authentication commands.
788 */
789 if (skb->len == MIFARE_CMD_LEN &&
790 (skb->data[0] == MIFARE_CMD_AUTH_KEY_A ||
791 skb->data[0] == MIFARE_CMD_AUTH_KEY_B)) {
792 u8 uid[MIFARE_UID_LEN];
793 u8 *data = skb->data + MIFARE_CMD_HEADER;
794
795 memcpy(uid, data + MIFARE_KEY_LEN,
796 MIFARE_UID_LEN);
797 memmove(data + MIFARE_UID_LEN, data,
798 MIFARE_KEY_LEN);
799 memcpy(data, uid, MIFARE_UID_LEN);
800 }
801
802 return nfc_hci_send_cmd_async(hdev,
803 target->hci_reader_gate,
804 PN544_MIFARE_CMD,
805 skb->data, skb->len,
806 cb, cb_context);
807 } else
808 return 1;
809 case PN544_RF_READER_F_GATE:
810 *skb_push(skb, 1) = 0;
811 *skb_push(skb, 1) = 0;
812
813 info->async_cb_type = PN544_CB_TYPE_READER_F;
814 info->async_cb = cb;
815 info->async_cb_context = cb_context;
816
817 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
818 PN544_FELICA_RAW, skb->data,
819 skb->len,
820 pn544_hci_data_exchange_cb, info);
821 case PN544_RF_READER_JEWEL_GATE:
822 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
823 PN544_JEWEL_RAW_CMD, skb->data,
824 skb->len, cb, cb_context);
825 default:
826 return 1;
827 }
828 }
829
830 static int pn544_hci_check_presence(struct nfc_hci_dev *hdev,
831 struct nfc_target *target)
832 {
833 return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
834 PN544_RF_READER_CMD_PRESENCE_CHECK,
835 NULL, 0, NULL);
836 }
837
838 static struct nfc_hci_ops pn544_hci_ops = {
839 .open = pn544_hci_open,
840 .close = pn544_hci_close,
841 .hci_ready = pn544_hci_ready,
842 .xmit = pn544_hci_xmit,
843 .start_poll = pn544_hci_start_poll,
844 .target_from_gate = pn544_hci_target_from_gate,
845 .complete_target_discovered = pn544_hci_complete_target_discovered,
846 .data_exchange = pn544_hci_data_exchange,
847 .check_presence = pn544_hci_check_presence,
848 };
849
850 static int __devinit pn544_hci_probe(struct i2c_client *client,
851 const struct i2c_device_id *id)
852 {
853 struct pn544_hci_info *info;
854 struct pn544_nfc_platform_data *pdata;
855 int r = 0;
856 u32 protocols;
857 struct nfc_hci_init_data init_data;
858
859 dev_dbg(&client->dev, "%s\n", __func__);
860 dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
861
862 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
863 dev_err(&client->dev, "Need I2C_FUNC_I2C\n");
864 return -ENODEV;
865 }
866
867 info = kzalloc(sizeof(struct pn544_hci_info), GFP_KERNEL);
868 if (!info) {
869 dev_err(&client->dev,
870 "Cannot allocate memory for pn544_hci_info.\n");
871 r = -ENOMEM;
872 goto err_info_alloc;
873 }
874
875 info->i2c_dev = client;
876 info->state = PN544_ST_COLD;
877 mutex_init(&info->info_lock);
878 i2c_set_clientdata(client, info);
879
880 pdata = client->dev.platform_data;
881 if (pdata == NULL) {
882 dev_err(&client->dev, "No platform data\n");
883 r = -EINVAL;
884 goto err_pdata;
885 }
886
887 if (pdata->request_resources == NULL) {
888 dev_err(&client->dev, "request_resources() missing\n");
889 r = -EINVAL;
890 goto err_pdata;
891 }
892
893 r = pdata->request_resources(client);
894 if (r) {
895 dev_err(&client->dev, "Cannot get platform resources\n");
896 goto err_pdata;
897 }
898
899 info->gpio_en = pdata->get_gpio(NFC_GPIO_ENABLE);
900 info->gpio_fw = pdata->get_gpio(NFC_GPIO_FW_RESET);
901 info->gpio_irq = pdata->get_gpio(NFC_GPIO_IRQ);
902
903 pn544_hci_platform_init(info);
904
905 r = request_threaded_irq(client->irq, NULL, pn544_hci_irq_thread_fn,
906 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
907 PN544_HCI_DRIVER_NAME, info);
908 if (r < 0) {
909 dev_err(&client->dev, "Unable to register IRQ handler\n");
910 goto err_rti;
911 }
912
913 init_data.gate_count = ARRAY_SIZE(pn544_gates);
914
915 memcpy(init_data.gates, pn544_gates, sizeof(pn544_gates));
916
917 /*
918 * TODO: Session id must include the driver name + some bus addr
919 * persistent info to discriminate 2 identical chips
920 */
921 strcpy(init_data.session_id, "ID544HCI");
922
923 protocols = NFC_PROTO_JEWEL_MASK |
924 NFC_PROTO_MIFARE_MASK |
925 NFC_PROTO_FELICA_MASK |
926 NFC_PROTO_ISO14443_MASK |
927 NFC_PROTO_ISO14443_B_MASK |
928 NFC_PROTO_NFC_DEP_MASK;
929
930 info->hdev = nfc_hci_allocate_device(&pn544_hci_ops, &init_data,
931 protocols, LLC_SHDLC_NAME,
932 PN544_FRAME_HEADROOM +
933 PN544_CMDS_HEADROOM,
934 PN544_FRAME_TAILROOM,
935 PN544_HCI_LLC_MAX_PAYLOAD);
936 if (!info->hdev) {
937 dev_err(&client->dev, "Cannot allocate nfc hdev.\n");
938 r = -ENOMEM;
939 goto err_alloc_hdev;
940 }
941
942 nfc_hci_set_clientdata(info->hdev, info);
943
944 r = nfc_hci_register_device(info->hdev);
945 if (r)
946 goto err_regdev;
947
948 return 0;
949
950 err_regdev:
951 nfc_hci_free_device(info->hdev);
952
953 err_alloc_hdev:
954 free_irq(client->irq, info);
955
956 err_rti:
957 if (pdata->free_resources != NULL)
958 pdata->free_resources();
959
960 err_pdata:
961 kfree(info);
962
963 err_info_alloc:
964 return r;
965 }
966
967 static __devexit int pn544_hci_remove(struct i2c_client *client)
968 {
969 struct pn544_hci_info *info = i2c_get_clientdata(client);
970 struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
971
972 dev_dbg(&client->dev, "%s\n", __func__);
973
974 nfc_hci_free_device(info->hdev);
975
976 if (info->state != PN544_ST_COLD) {
977 if (pdata->disable)
978 pdata->disable();
979 }
980
981 free_irq(client->irq, info);
982 if (pdata->free_resources)
983 pdata->free_resources();
984
985 kfree(info);
986
987 return 0;
988 }
989
990 static struct i2c_driver pn544_hci_driver = {
991 .driver = {
992 .name = PN544_HCI_DRIVER_NAME,
993 },
994 .probe = pn544_hci_probe,
995 .id_table = pn544_hci_id_table,
996 .remove = __devexit_p(pn544_hci_remove),
997 };
998
999 static int __init pn544_hci_init(void)
1000 {
1001 int r;
1002
1003 pr_debug(DRIVER_DESC ": %s\n", __func__);
1004
1005 r = i2c_add_driver(&pn544_hci_driver);
1006 if (r) {
1007 pr_err(PN544_HCI_DRIVER_NAME ": driver registration failed\n");
1008 return r;
1009 }
1010
1011 return 0;
1012 }
1013
1014 static void __exit pn544_hci_exit(void)
1015 {
1016 i2c_del_driver(&pn544_hci_driver);
1017 }
1018
1019 module_init(pn544_hci_init);
1020 module_exit(pn544_hci_exit);
1021
1022 MODULE_LICENSE("GPL");
1023 MODULE_DESCRIPTION(DRIVER_DESC);
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