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bbed0dee EL |
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/shdlc.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 | ||
a10d595b EL |
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} | |
bbed0dee EL |
127 | }; |
128 | ||
129 | /* Largest headroom needed for outgoing custom commands */ | |
130 | #define PN544_CMDS_HEADROOM 2 | |
131 | ||
132 | struct pn544_hci_info { | |
133 | struct i2c_client *i2c_dev; | |
134 | struct nfc_shdlc *shdlc; | |
135 | ||
136 | enum pn544_state state; | |
137 | ||
138 | struct mutex info_lock; | |
139 | ||
140 | unsigned int gpio_en; | |
141 | unsigned int gpio_irq; | |
142 | unsigned int gpio_fw; | |
143 | unsigned int en_polarity; | |
144 | ||
145 | int hard_fault; /* | |
146 | * < 0 if hardware error occured (e.g. i2c err) | |
147 | * and prevents normal operation. | |
148 | */ | |
149 | }; | |
150 | ||
151 | static void pn544_hci_platform_init(struct pn544_hci_info *info) | |
152 | { | |
153 | int polarity, retry, ret; | |
154 | char rset_cmd[] = { 0x05, 0xF9, 0x04, 0x00, 0xC3, 0xE5 }; | |
155 | int count = sizeof(rset_cmd); | |
156 | ||
157 | pr_info(DRIVER_DESC ": %s\n", __func__); | |
158 | dev_info(&info->i2c_dev->dev, "Detecting nfc_en polarity\n"); | |
159 | ||
160 | /* Disable fw download */ | |
161 | gpio_set_value(info->gpio_fw, 0); | |
162 | ||
163 | for (polarity = 0; polarity < 2; polarity++) { | |
164 | info->en_polarity = polarity; | |
165 | retry = 3; | |
166 | while (retry--) { | |
167 | /* power off */ | |
168 | gpio_set_value(info->gpio_en, !info->en_polarity); | |
169 | usleep_range(10000, 15000); | |
170 | ||
171 | /* power on */ | |
172 | gpio_set_value(info->gpio_en, info->en_polarity); | |
173 | usleep_range(10000, 15000); | |
174 | ||
175 | /* send reset */ | |
176 | dev_dbg(&info->i2c_dev->dev, "Sending reset cmd\n"); | |
177 | ret = i2c_master_send(info->i2c_dev, rset_cmd, count); | |
178 | if (ret == count) { | |
179 | dev_info(&info->i2c_dev->dev, | |
180 | "nfc_en polarity : active %s\n", | |
181 | (polarity == 0 ? "low" : "high")); | |
182 | goto out; | |
183 | } | |
184 | } | |
185 | } | |
186 | ||
187 | dev_err(&info->i2c_dev->dev, | |
188 | "Could not detect nfc_en polarity, fallback to active high\n"); | |
189 | ||
190 | out: | |
191 | gpio_set_value(info->gpio_en, !info->en_polarity); | |
192 | } | |
193 | ||
194 | static int pn544_hci_enable(struct pn544_hci_info *info, int mode) | |
195 | { | |
196 | pr_info(DRIVER_DESC ": %s\n", __func__); | |
197 | ||
198 | gpio_set_value(info->gpio_fw, 0); | |
199 | gpio_set_value(info->gpio_en, info->en_polarity); | |
200 | usleep_range(10000, 15000); | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | static void pn544_hci_disable(struct pn544_hci_info *info) | |
206 | { | |
207 | pr_info(DRIVER_DESC ": %s\n", __func__); | |
208 | ||
209 | gpio_set_value(info->gpio_fw, 0); | |
210 | gpio_set_value(info->gpio_en, !info->en_polarity); | |
211 | usleep_range(10000, 15000); | |
212 | ||
213 | gpio_set_value(info->gpio_en, info->en_polarity); | |
214 | usleep_range(10000, 15000); | |
215 | ||
216 | gpio_set_value(info->gpio_en, !info->en_polarity); | |
217 | usleep_range(10000, 15000); | |
218 | } | |
219 | ||
220 | static int pn544_hci_i2c_write(struct i2c_client *client, u8 *buf, int len) | |
221 | { | |
222 | int r; | |
223 | ||
224 | usleep_range(3000, 6000); | |
225 | ||
226 | r = i2c_master_send(client, buf, len); | |
227 | ||
228 | if (r == -EREMOTEIO) { /* Retry, chip was in standby */ | |
229 | usleep_range(6000, 10000); | |
230 | r = i2c_master_send(client, buf, len); | |
231 | } | |
232 | ||
233 | if (r >= 0 && r != len) | |
234 | r = -EREMOTEIO; | |
235 | ||
236 | return r; | |
237 | } | |
238 | ||
239 | static int check_crc(u8 *buf, int buflen) | |
240 | { | |
885ba1da | 241 | int len; |
bbed0dee EL |
242 | u16 crc; |
243 | ||
244 | len = buf[0] + 1; | |
245 | crc = crc_ccitt(0xffff, buf, len - 2); | |
246 | crc = ~crc; | |
247 | ||
248 | if (buf[len - 2] != (crc & 0xff) || buf[len - 1] != (crc >> 8)) { | |
249 | pr_err(PN544_HCI_DRIVER_NAME ": CRC error 0x%x != 0x%x 0x%x\n", | |
250 | crc, buf[len - 1], buf[len - 2]); | |
251 | ||
252 | pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__); | |
253 | print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE, | |
254 | 16, 2, buf, buflen, false); | |
255 | return -EPERM; | |
256 | } | |
257 | return 0; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees | |
262 | * that i2c bus will be flushed and that next read will start on a new frame. | |
263 | * returned skb contains only LLC header and payload. | |
264 | * returns: | |
265 | * -EREMOTEIO : i2c read error (fatal) | |
266 | * -EBADMSG : frame was incorrect and discarded | |
267 | * -ENOMEM : cannot allocate skb, frame dropped | |
268 | */ | |
269 | static int pn544_hci_i2c_read(struct i2c_client *client, struct sk_buff **skb) | |
270 | { | |
271 | int r; | |
272 | u8 len; | |
273 | u8 tmp[PN544_HCI_LLC_MAX_SIZE - 1]; | |
274 | ||
275 | r = i2c_master_recv(client, &len, 1); | |
276 | if (r != 1) { | |
277 | dev_err(&client->dev, "cannot read len byte\n"); | |
278 | return -EREMOTEIO; | |
279 | } | |
280 | ||
281 | if ((len < (PN544_HCI_LLC_MIN_SIZE - 1)) || | |
282 | (len > (PN544_HCI_LLC_MAX_SIZE - 1))) { | |
283 | dev_err(&client->dev, "invalid len byte\n"); | |
284 | r = -EBADMSG; | |
285 | goto flush; | |
286 | } | |
287 | ||
288 | *skb = alloc_skb(1 + len, GFP_KERNEL); | |
289 | if (*skb == NULL) { | |
290 | r = -ENOMEM; | |
291 | goto flush; | |
292 | } | |
293 | ||
294 | *skb_put(*skb, 1) = len; | |
295 | ||
296 | r = i2c_master_recv(client, skb_put(*skb, len), len); | |
297 | if (r != len) { | |
298 | kfree_skb(*skb); | |
299 | return -EREMOTEIO; | |
300 | } | |
301 | ||
302 | r = check_crc((*skb)->data, (*skb)->len); | |
303 | if (r != 0) { | |
304 | kfree_skb(*skb); | |
305 | r = -EBADMSG; | |
306 | goto flush; | |
307 | } | |
308 | ||
309 | skb_pull(*skb, 1); | |
310 | skb_trim(*skb, (*skb)->len - 2); | |
311 | ||
312 | usleep_range(3000, 6000); | |
313 | ||
314 | return 0; | |
315 | ||
316 | flush: | |
317 | if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0) | |
318 | r = -EREMOTEIO; | |
319 | ||
320 | usleep_range(3000, 6000); | |
321 | ||
322 | return r; | |
323 | } | |
324 | ||
325 | /* | |
326 | * Reads an shdlc frame from the chip. This is not as straightforward as it | |
327 | * seems. There are cases where we could loose the frame start synchronization. | |
328 | * The frame format is len-data-crc, and corruption can occur anywhere while | |
329 | * transiting on i2c bus, such that we could read an invalid len. | |
330 | * In order to recover synchronization with the next frame, we must be sure | |
331 | * to read the real amount of data without using the len byte. We do this by | |
332 | * assuming the following: | |
333 | * - the chip will always present only one single complete frame on the bus | |
334 | * before triggering the interrupt | |
335 | * - the chip will not present a new frame until we have completely read | |
336 | * the previous one (or until we have handled the interrupt). | |
337 | * The tricky case is when we read a corrupted len that is less than the real | |
338 | * len. We must detect this here in order to determine that we need to flush | |
339 | * the bus. This is the reason why we check the crc here. | |
340 | */ | |
341 | static irqreturn_t pn544_hci_irq_thread_fn(int irq, void *dev_id) | |
342 | { | |
343 | struct pn544_hci_info *info = dev_id; | |
344 | struct i2c_client *client = info->i2c_dev; | |
345 | struct sk_buff *skb = NULL; | |
346 | int r; | |
347 | ||
348 | BUG_ON(!info); | |
349 | BUG_ON(irq != info->i2c_dev->irq); | |
350 | ||
351 | dev_dbg(&client->dev, "IRQ\n"); | |
352 | ||
353 | if (info->hard_fault != 0) | |
354 | return IRQ_HANDLED; | |
355 | ||
356 | r = pn544_hci_i2c_read(client, &skb); | |
357 | if (r == -EREMOTEIO) { | |
358 | info->hard_fault = r; | |
359 | ||
360 | nfc_shdlc_recv_frame(info->shdlc, NULL); | |
361 | ||
362 | return IRQ_HANDLED; | |
363 | } else if ((r == -ENOMEM) || (r == -EBADMSG)) { | |
364 | return IRQ_HANDLED; | |
365 | } | |
366 | ||
367 | nfc_shdlc_recv_frame(info->shdlc, skb); | |
368 | ||
369 | return IRQ_HANDLED; | |
370 | } | |
371 | ||
372 | static int pn544_hci_open(struct nfc_shdlc *shdlc) | |
373 | { | |
374 | struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc); | |
375 | int r = 0; | |
376 | ||
377 | mutex_lock(&info->info_lock); | |
378 | ||
379 | if (info->state != PN544_ST_COLD) { | |
380 | r = -EBUSY; | |
381 | goto out; | |
382 | } | |
383 | ||
384 | r = pn544_hci_enable(info, HCI_MODE); | |
385 | ||
eae202aa EL |
386 | if (r == 0) |
387 | info->state = PN544_ST_READY; | |
388 | ||
bbed0dee EL |
389 | out: |
390 | mutex_unlock(&info->info_lock); | |
391 | return r; | |
392 | } | |
393 | ||
394 | static void pn544_hci_close(struct nfc_shdlc *shdlc) | |
395 | { | |
396 | struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc); | |
397 | ||
398 | mutex_lock(&info->info_lock); | |
399 | ||
400 | if (info->state == PN544_ST_COLD) | |
401 | goto out; | |
402 | ||
403 | pn544_hci_disable(info); | |
404 | ||
eae202aa EL |
405 | info->state = PN544_ST_COLD; |
406 | ||
bbed0dee EL |
407 | out: |
408 | mutex_unlock(&info->info_lock); | |
409 | } | |
410 | ||
411 | static int pn544_hci_ready(struct nfc_shdlc *shdlc) | |
412 | { | |
413 | struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc); | |
414 | struct sk_buff *skb; | |
415 | static struct hw_config { | |
416 | u8 adr[2]; | |
417 | u8 value; | |
418 | } hw_config[] = { | |
419 | {{0x9f, 0x9a}, 0x00}, | |
420 | ||
421 | {{0x98, 0x10}, 0xbc}, | |
422 | ||
423 | {{0x9e, 0x71}, 0x00}, | |
424 | ||
425 | {{0x98, 0x09}, 0x00}, | |
426 | ||
427 | {{0x9e, 0xb4}, 0x00}, | |
428 | ||
429 | {{0x9e, 0xd9}, 0xff}, | |
430 | {{0x9e, 0xda}, 0xff}, | |
431 | {{0x9e, 0xdb}, 0x23}, | |
432 | {{0x9e, 0xdc}, 0x21}, | |
433 | {{0x9e, 0xdd}, 0x22}, | |
434 | {{0x9e, 0xde}, 0x24}, | |
435 | ||
436 | {{0x9c, 0x01}, 0x08}, | |
437 | ||
438 | {{0x9e, 0xaa}, 0x01}, | |
439 | ||
440 | {{0x9b, 0xd1}, 0x0d}, | |
441 | {{0x9b, 0xd2}, 0x24}, | |
442 | {{0x9b, 0xd3}, 0x0a}, | |
443 | {{0x9b, 0xd4}, 0x22}, | |
444 | {{0x9b, 0xd5}, 0x08}, | |
445 | {{0x9b, 0xd6}, 0x1e}, | |
446 | {{0x9b, 0xdd}, 0x1c}, | |
447 | ||
448 | {{0x9b, 0x84}, 0x13}, | |
449 | {{0x99, 0x81}, 0x7f}, | |
450 | {{0x99, 0x31}, 0x70}, | |
451 | ||
452 | {{0x98, 0x00}, 0x3f}, | |
453 | ||
454 | {{0x9f, 0x09}, 0x00}, | |
455 | ||
456 | {{0x9f, 0x0a}, 0x05}, | |
457 | ||
458 | {{0x9e, 0xd1}, 0xa1}, | |
459 | {{0x99, 0x23}, 0x00}, | |
460 | ||
461 | {{0x9e, 0x74}, 0x80}, | |
462 | ||
463 | {{0x9f, 0x28}, 0x10}, | |
464 | ||
465 | {{0x9f, 0x35}, 0x14}, | |
466 | ||
467 | {{0x9f, 0x36}, 0x60}, | |
468 | ||
469 | {{0x9c, 0x31}, 0x00}, | |
470 | ||
471 | {{0x9c, 0x32}, 0xc8}, | |
472 | ||
473 | {{0x9c, 0x19}, 0x40}, | |
474 | ||
475 | {{0x9c, 0x1a}, 0x40}, | |
476 | ||
477 | {{0x9c, 0x0c}, 0x00}, | |
478 | ||
479 | {{0x9c, 0x0d}, 0x00}, | |
480 | ||
481 | {{0x9c, 0x12}, 0x00}, | |
482 | ||
483 | {{0x9c, 0x13}, 0x00}, | |
484 | ||
485 | {{0x98, 0xa2}, 0x0e}, | |
486 | ||
487 | {{0x98, 0x93}, 0x40}, | |
488 | ||
489 | {{0x98, 0x7d}, 0x02}, | |
490 | {{0x98, 0x7e}, 0x00}, | |
491 | {{0x9f, 0xc8}, 0x01}, | |
492 | }; | |
493 | struct hw_config *p = hw_config; | |
494 | int count = ARRAY_SIZE(hw_config); | |
495 | struct sk_buff *res_skb; | |
496 | u8 param[4]; | |
497 | int r; | |
498 | ||
499 | param[0] = 0; | |
500 | while (count--) { | |
501 | param[1] = p->adr[0]; | |
502 | param[2] = p->adr[1]; | |
503 | param[3] = p->value; | |
504 | ||
505 | r = nfc_hci_send_cmd(hdev, PN544_SYS_MGMT_GATE, PN544_WRITE, | |
506 | param, 4, &res_skb); | |
507 | if (r < 0) | |
508 | return r; | |
509 | ||
510 | if (res_skb->len != 1) { | |
511 | kfree_skb(res_skb); | |
512 | return -EPROTO; | |
513 | } | |
514 | ||
515 | if (res_skb->data[0] != p->value) { | |
516 | kfree_skb(res_skb); | |
517 | return -EIO; | |
518 | } | |
519 | ||
520 | kfree_skb(res_skb); | |
521 | ||
522 | p++; | |
523 | } | |
524 | ||
525 | param[0] = NFC_HCI_UICC_HOST_ID; | |
526 | r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE, | |
527 | NFC_HCI_ADMIN_WHITELIST, param, 1); | |
528 | if (r < 0) | |
529 | return r; | |
530 | ||
531 | param[0] = 0x3d; | |
532 | r = nfc_hci_set_param(hdev, PN544_SYS_MGMT_GATE, | |
533 | PN544_SYS_MGMT_INFO_NOTIFICATION, param, 1); | |
534 | if (r < 0) | |
535 | return r; | |
536 | ||
537 | param[0] = 0x0; | |
538 | r = nfc_hci_set_param(hdev, NFC_HCI_RF_READER_A_GATE, | |
539 | PN544_RF_READER_A_AUTO_ACTIVATION, param, 1); | |
540 | if (r < 0) | |
541 | return r; | |
542 | ||
543 | r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, | |
544 | NFC_HCI_EVT_END_OPERATION, NULL, 0); | |
545 | if (r < 0) | |
546 | return r; | |
547 | ||
548 | param[0] = 0x1; | |
549 | r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE, | |
550 | PN544_PL_NFCT_DEACTIVATED, param, 1); | |
551 | if (r < 0) | |
552 | return r; | |
553 | ||
554 | param[0] = 0x0; | |
555 | r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE, | |
556 | PN544_PL_RDPHASES, param, 1); | |
557 | if (r < 0) | |
558 | return r; | |
559 | ||
560 | r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, | |
561 | PN544_ID_MGMT_FULL_VERSION_SW, &skb); | |
562 | if (r < 0) | |
563 | return r; | |
564 | ||
565 | if (skb->len != FULL_VERSION_LEN) { | |
566 | kfree_skb(skb); | |
567 | return -EINVAL; | |
568 | } | |
569 | ||
570 | print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ", | |
571 | DUMP_PREFIX_NONE, 16, 1, | |
572 | skb->data, FULL_VERSION_LEN, false); | |
573 | ||
574 | kfree_skb(skb); | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | static int pn544_hci_xmit(struct nfc_shdlc *shdlc, struct sk_buff *skb) | |
580 | { | |
581 | struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc); | |
582 | struct i2c_client *client = info->i2c_dev; | |
583 | ||
584 | if (info->hard_fault != 0) | |
585 | return info->hard_fault; | |
586 | ||
587 | return pn544_hci_i2c_write(client, skb->data, skb->len); | |
588 | } | |
589 | ||
fe7c5800 SO |
590 | static int pn544_hci_start_poll(struct nfc_shdlc *shdlc, |
591 | u32 im_protocols, u32 tm_protocols) | |
bbed0dee EL |
592 | { |
593 | struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc); | |
594 | u8 phases = 0; | |
595 | int r; | |
596 | u8 duration[2]; | |
597 | u8 activated; | |
598 | ||
fe7c5800 SO |
599 | pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n", |
600 | __func__, im_protocols, tm_protocols); | |
bbed0dee EL |
601 | |
602 | r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, | |
603 | NFC_HCI_EVT_END_OPERATION, NULL, 0); | |
604 | if (r < 0) | |
605 | return r; | |
606 | ||
607 | duration[0] = 0x18; | |
608 | duration[1] = 0x6a; | |
609 | r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE, | |
610 | PN544_PL_EMULATION, duration, 2); | |
611 | if (r < 0) | |
612 | return r; | |
613 | ||
614 | activated = 0; | |
615 | r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE, | |
616 | PN544_PL_NFCT_DEACTIVATED, &activated, 1); | |
617 | if (r < 0) | |
618 | return r; | |
619 | ||
fe7c5800 | 620 | if (im_protocols & (NFC_PROTO_ISO14443_MASK | NFC_PROTO_MIFARE_MASK | |
bbed0dee EL |
621 | NFC_PROTO_JEWEL_MASK)) |
622 | phases |= 1; /* Type A */ | |
fe7c5800 | 623 | if (im_protocols & NFC_PROTO_FELICA_MASK) { |
bbed0dee EL |
624 | phases |= (1 << 2); /* Type F 212 */ |
625 | phases |= (1 << 3); /* Type F 424 */ | |
626 | } | |
627 | ||
628 | phases |= (1 << 5); /* NFC active */ | |
629 | ||
630 | r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE, | |
631 | PN544_PL_RDPHASES, &phases, 1); | |
632 | if (r < 0) | |
633 | return r; | |
634 | ||
635 | r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, | |
636 | NFC_HCI_EVT_READER_REQUESTED, NULL, 0); | |
637 | if (r < 0) | |
638 | nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, | |
639 | NFC_HCI_EVT_END_OPERATION, NULL, 0); | |
640 | ||
641 | return r; | |
642 | } | |
643 | ||
644 | static int pn544_hci_target_from_gate(struct nfc_shdlc *shdlc, u8 gate, | |
645 | struct nfc_target *target) | |
646 | { | |
647 | switch (gate) { | |
648 | case PN544_RF_READER_F_GATE: | |
649 | target->supported_protocols = NFC_PROTO_FELICA_MASK; | |
650 | break; | |
651 | case PN544_RF_READER_JEWEL_GATE: | |
652 | target->supported_protocols = NFC_PROTO_JEWEL_MASK; | |
653 | target->sens_res = 0x0c00; | |
654 | break; | |
655 | default: | |
656 | return -EPROTO; | |
657 | } | |
658 | ||
659 | return 0; | |
660 | } | |
661 | ||
662 | static int pn544_hci_complete_target_discovered(struct nfc_shdlc *shdlc, | |
663 | u8 gate, | |
664 | struct nfc_target *target) | |
665 | { | |
666 | struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc); | |
667 | struct sk_buff *uid_skb; | |
668 | int r = 0; | |
669 | ||
670 | if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) { | |
671 | if (target->nfcid1_len != 4 && target->nfcid1_len != 7 && | |
672 | target->nfcid1_len != 10) | |
673 | return -EPROTO; | |
674 | ||
675 | r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE, | |
676 | PN544_RF_READER_CMD_ACTIVATE_NEXT, | |
677 | target->nfcid1, target->nfcid1_len, NULL); | |
678 | } else if (target->supported_protocols & NFC_PROTO_FELICA_MASK) { | |
679 | r = nfc_hci_get_param(hdev, PN544_RF_READER_F_GATE, | |
680 | PN544_FELICA_ID, &uid_skb); | |
681 | if (r < 0) | |
682 | return r; | |
683 | ||
684 | if (uid_skb->len != 8) { | |
685 | kfree_skb(uid_skb); | |
686 | return -EPROTO; | |
687 | } | |
688 | ||
689 | r = nfc_hci_send_cmd(hdev, PN544_RF_READER_F_GATE, | |
690 | PN544_RF_READER_CMD_ACTIVATE_NEXT, | |
691 | uid_skb->data, uid_skb->len, NULL); | |
692 | kfree_skb(uid_skb); | |
693 | } else if (target->supported_protocols & NFC_PROTO_ISO14443_MASK) { | |
694 | /* | |
695 | * TODO: maybe other ISO 14443 require some kind of continue | |
696 | * activation, but for now we've seen only this one below. | |
697 | */ | |
698 | if (target->sens_res == 0x4403) /* Type 4 Mifare DESFire */ | |
699 | r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE, | |
700 | PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION, | |
701 | NULL, 0, NULL); | |
702 | } | |
703 | ||
704 | return r; | |
705 | } | |
706 | ||
707 | #define MIFARE_CMD_AUTH_KEY_A 0x60 | |
708 | #define MIFARE_CMD_AUTH_KEY_B 0x61 | |
709 | #define MIFARE_CMD_HEADER 2 | |
710 | #define MIFARE_UID_LEN 4 | |
711 | #define MIFARE_KEY_LEN 6 | |
712 | #define MIFARE_CMD_LEN 12 | |
713 | /* | |
714 | * Returns: | |
715 | * <= 0: driver handled the data exchange | |
716 | * 1: driver doesn't especially handle, please do standard processing | |
717 | */ | |
718 | static int pn544_hci_data_exchange(struct nfc_shdlc *shdlc, | |
719 | struct nfc_target *target, | |
720 | struct sk_buff *skb, | |
721 | struct sk_buff **res_skb) | |
722 | { | |
723 | struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc); | |
724 | int r; | |
725 | ||
726 | pr_info(DRIVER_DESC ": %s for gate=%d\n", __func__, | |
727 | target->hci_reader_gate); | |
728 | ||
729 | switch (target->hci_reader_gate) { | |
730 | case NFC_HCI_RF_READER_A_GATE: | |
731 | if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) { | |
732 | /* | |
733 | * It seems that pn544 is inverting key and UID for | |
734 | * MIFARE authentication commands. | |
735 | */ | |
736 | if (skb->len == MIFARE_CMD_LEN && | |
737 | (skb->data[0] == MIFARE_CMD_AUTH_KEY_A || | |
738 | skb->data[0] == MIFARE_CMD_AUTH_KEY_B)) { | |
739 | u8 uid[MIFARE_UID_LEN]; | |
740 | u8 *data = skb->data + MIFARE_CMD_HEADER; | |
741 | ||
742 | memcpy(uid, data + MIFARE_KEY_LEN, | |
743 | MIFARE_UID_LEN); | |
744 | memmove(data + MIFARE_UID_LEN, data, | |
745 | MIFARE_KEY_LEN); | |
746 | memcpy(data, uid, MIFARE_UID_LEN); | |
747 | } | |
748 | ||
749 | return nfc_hci_send_cmd(hdev, target->hci_reader_gate, | |
750 | PN544_MIFARE_CMD, | |
751 | skb->data, skb->len, res_skb); | |
752 | } else | |
753 | return 1; | |
754 | case PN544_RF_READER_F_GATE: | |
755 | *skb_push(skb, 1) = 0; | |
756 | *skb_push(skb, 1) = 0; | |
757 | ||
758 | r = nfc_hci_send_cmd(hdev, target->hci_reader_gate, | |
759 | PN544_FELICA_RAW, | |
760 | skb->data, skb->len, res_skb); | |
761 | if (r == 0) | |
762 | skb_pull(*res_skb, 1); | |
763 | return r; | |
764 | case PN544_RF_READER_JEWEL_GATE: | |
765 | return nfc_hci_send_cmd(hdev, target->hci_reader_gate, | |
766 | PN544_JEWEL_RAW_CMD, | |
767 | skb->data, skb->len, res_skb); | |
768 | default: | |
769 | return 1; | |
770 | } | |
771 | } | |
772 | ||
773 | static int pn544_hci_check_presence(struct nfc_shdlc *shdlc, | |
774 | struct nfc_target *target) | |
775 | { | |
776 | struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc); | |
777 | ||
778 | return nfc_hci_send_cmd(hdev, target->hci_reader_gate, | |
779 | PN544_RF_READER_CMD_PRESENCE_CHECK, | |
780 | NULL, 0, NULL); | |
781 | } | |
782 | ||
783 | static struct nfc_shdlc_ops pn544_shdlc_ops = { | |
784 | .open = pn544_hci_open, | |
785 | .close = pn544_hci_close, | |
786 | .hci_ready = pn544_hci_ready, | |
787 | .xmit = pn544_hci_xmit, | |
788 | .start_poll = pn544_hci_start_poll, | |
789 | .target_from_gate = pn544_hci_target_from_gate, | |
790 | .complete_target_discovered = pn544_hci_complete_target_discovered, | |
791 | .data_exchange = pn544_hci_data_exchange, | |
792 | .check_presence = pn544_hci_check_presence, | |
793 | }; | |
794 | ||
795 | static int __devinit pn544_hci_probe(struct i2c_client *client, | |
796 | const struct i2c_device_id *id) | |
797 | { | |
798 | struct pn544_hci_info *info; | |
799 | struct pn544_nfc_platform_data *pdata; | |
800 | int r = 0; | |
801 | u32 protocols; | |
802 | struct nfc_hci_init_data init_data; | |
803 | ||
804 | dev_dbg(&client->dev, "%s\n", __func__); | |
805 | dev_dbg(&client->dev, "IRQ: %d\n", client->irq); | |
806 | ||
807 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
808 | dev_err(&client->dev, "Need I2C_FUNC_I2C\n"); | |
809 | return -ENODEV; | |
810 | } | |
811 | ||
812 | info = kzalloc(sizeof(struct pn544_hci_info), GFP_KERNEL); | |
813 | if (!info) { | |
814 | dev_err(&client->dev, | |
815 | "Cannot allocate memory for pn544_hci_info.\n"); | |
816 | r = -ENOMEM; | |
817 | goto err_info_alloc; | |
818 | } | |
819 | ||
820 | info->i2c_dev = client; | |
821 | info->state = PN544_ST_COLD; | |
822 | mutex_init(&info->info_lock); | |
823 | i2c_set_clientdata(client, info); | |
824 | ||
825 | pdata = client->dev.platform_data; | |
826 | if (pdata == NULL) { | |
827 | dev_err(&client->dev, "No platform data\n"); | |
828 | r = -EINVAL; | |
829 | goto err_pdata; | |
830 | } | |
831 | ||
832 | if (pdata->request_resources == NULL) { | |
833 | dev_err(&client->dev, "request_resources() missing\n"); | |
834 | r = -EINVAL; | |
835 | goto err_pdata; | |
836 | } | |
837 | ||
838 | r = pdata->request_resources(client); | |
839 | if (r) { | |
840 | dev_err(&client->dev, "Cannot get platform resources\n"); | |
841 | goto err_pdata; | |
842 | } | |
843 | ||
844 | info->gpio_en = pdata->get_gpio(NFC_GPIO_ENABLE); | |
845 | info->gpio_fw = pdata->get_gpio(NFC_GPIO_FW_RESET); | |
846 | info->gpio_irq = pdata->get_gpio(NFC_GPIO_IRQ); | |
847 | ||
848 | pn544_hci_platform_init(info); | |
849 | ||
850 | r = request_threaded_irq(client->irq, NULL, pn544_hci_irq_thread_fn, | |
851 | IRQF_TRIGGER_RISING, PN544_HCI_DRIVER_NAME, | |
852 | info); | |
853 | if (r < 0) { | |
854 | dev_err(&client->dev, "Unable to register IRQ handler\n"); | |
855 | goto err_rti; | |
856 | } | |
857 | ||
a10d595b | 858 | init_data.gate_count = ARRAY_SIZE(pn544_gates); |
bbed0dee | 859 | |
a10d595b | 860 | memcpy(init_data.gates, pn544_gates, sizeof(pn544_gates)); |
bbed0dee EL |
861 | |
862 | /* | |
863 | * TODO: Session id must include the driver name + some bus addr | |
864 | * persistent info to discriminate 2 identical chips | |
865 | */ | |
866 | strcpy(init_data.session_id, "ID544HCI"); | |
867 | ||
868 | protocols = NFC_PROTO_JEWEL_MASK | | |
869 | NFC_PROTO_MIFARE_MASK | | |
870 | NFC_PROTO_FELICA_MASK | | |
871 | NFC_PROTO_ISO14443_MASK | | |
01d719a2 | 872 | NFC_PROTO_ISO14443_B_MASK | |
bbed0dee EL |
873 | NFC_PROTO_NFC_DEP_MASK; |
874 | ||
875 | info->shdlc = nfc_shdlc_allocate(&pn544_shdlc_ops, | |
876 | &init_data, protocols, | |
877 | PN544_CMDS_HEADROOM, 0, | |
878 | PN544_HCI_LLC_MAX_PAYLOAD, | |
879 | dev_name(&client->dev)); | |
880 | if (!info->shdlc) { | |
881 | dev_err(&client->dev, "Cannot allocate nfc shdlc.\n"); | |
882 | r = -ENOMEM; | |
883 | goto err_allocshdlc; | |
884 | } | |
885 | ||
886 | nfc_shdlc_set_clientdata(info->shdlc, info); | |
887 | ||
888 | return 0; | |
889 | ||
890 | err_allocshdlc: | |
891 | free_irq(client->irq, info); | |
892 | ||
893 | err_rti: | |
894 | if (pdata->free_resources != NULL) | |
895 | pdata->free_resources(); | |
896 | ||
897 | err_pdata: | |
898 | kfree(info); | |
899 | ||
900 | err_info_alloc: | |
901 | return r; | |
902 | } | |
903 | ||
904 | static __devexit int pn544_hci_remove(struct i2c_client *client) | |
905 | { | |
906 | struct pn544_hci_info *info = i2c_get_clientdata(client); | |
907 | struct pn544_nfc_platform_data *pdata = client->dev.platform_data; | |
908 | ||
909 | dev_dbg(&client->dev, "%s\n", __func__); | |
910 | ||
911 | nfc_shdlc_free(info->shdlc); | |
912 | ||
913 | if (info->state != PN544_ST_COLD) { | |
914 | if (pdata->disable) | |
915 | pdata->disable(); | |
916 | } | |
917 | ||
918 | free_irq(client->irq, info); | |
919 | if (pdata->free_resources) | |
920 | pdata->free_resources(); | |
921 | ||
922 | kfree(info); | |
923 | ||
924 | return 0; | |
925 | } | |
926 | ||
927 | static struct i2c_driver pn544_hci_driver = { | |
928 | .driver = { | |
929 | .name = PN544_HCI_DRIVER_NAME, | |
930 | }, | |
931 | .probe = pn544_hci_probe, | |
932 | .id_table = pn544_hci_id_table, | |
933 | .remove = __devexit_p(pn544_hci_remove), | |
934 | }; | |
935 | ||
936 | static int __init pn544_hci_init(void) | |
937 | { | |
938 | int r; | |
939 | ||
940 | pr_debug(DRIVER_DESC ": %s\n", __func__); | |
941 | ||
942 | r = i2c_add_driver(&pn544_hci_driver); | |
943 | if (r) { | |
944 | pr_err(PN544_HCI_DRIVER_NAME ": driver registration failed\n"); | |
945 | return r; | |
946 | } | |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
951 | static void __exit pn544_hci_exit(void) | |
952 | { | |
953 | i2c_del_driver(&pn544_hci_driver); | |
954 | } | |
955 | ||
956 | module_init(pn544_hci_init); | |
957 | module_exit(pn544_hci_exit); | |
958 | ||
959 | MODULE_LICENSE("GPL"); | |
960 | MODULE_DESCRIPTION(DRIVER_DESC); |