1 /*
2 * I2C Link Layer for ST21NFCA HCI based Driver
3 * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 */
17
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20 #include <linux/crc-ccitt.h>
21 #include <linux/module.h>
22 #include <linux/i2c.h>
23 #include <linux/gpio.h>
24 #include <linux/of_irq.h>
25 #include <linux/of_gpio.h>
26 #include <linux/miscdevice.h>
27 #include <linux/interrupt.h>
28 #include <linux/delay.h>
29 #include <linux/nfc.h>
30 #include <linux/firmware.h>
31 #include <linux/platform_data/st21nfca.h>
32 #include <asm/unaligned.h>
33
34 #include <net/nfc/hci.h>
35 #include <net/nfc/llc.h>
36 #include <net/nfc/nfc.h>
37
38 #include "st21nfca.h"
39
40 /*
41 * Every frame starts with ST21NFCA_SOF_EOF and ends with ST21NFCA_SOF_EOF.
42 * Because ST21NFCA_SOF_EOF is a possible data value, there is a mecanism
43 * called byte stuffing has been introduced.
44 *
45 * if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING
46 * - insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte)
47 * - xor byte with ST21NFCA_BYTE_STUFFING_MASK
48 */
49 #define ST21NFCA_SOF_EOF 0x7e
50 #define ST21NFCA_BYTE_STUFFING_MASK 0x20
51 #define ST21NFCA_ESCAPE_BYTE_STUFFING 0x7d
52
53 /* SOF + 00 */
54 #define ST21NFCA_FRAME_HEADROOM 2
55
56 /* 2 bytes crc + EOF */
57 #define ST21NFCA_FRAME_TAILROOM 3
58 #define IS_START_OF_FRAME(buf) (buf[0] == ST21NFCA_SOF_EOF && \
59 buf[1] == 0)
60
61 #define ST21NFCA_HCI_I2C_DRIVER_NAME "st21nfca_hci_i2c"
62
63 static struct i2c_device_id st21nfca_hci_i2c_id_table[] = {
64 {ST21NFCA_HCI_DRIVER_NAME, 0},
65 {}
66 };
67
68 MODULE_DEVICE_TABLE(i2c, st21nfca_hci_i2c_id_table);
69
70 struct st21nfca_i2c_phy {
71 struct i2c_client *i2c_dev;
72 struct nfc_hci_dev *hdev;
73
74 unsigned int gpio_ena;
75 unsigned int irq_polarity;
76
77 struct st21nfca_se_status se_status;
78
79 struct sk_buff *pending_skb;
80 int current_read_len;
81 /*
82 * crc might have fail because i2c macro
83 * is disable due to other interface activity
84 */
85 int crc_trials;
86
87 int powered;
88 int run_mode;
89
90 /*
91 * < 0 if hardware error occured (e.g. i2c err)
92 * and prevents normal operation.
93 */
94 int hard_fault;
95 struct mutex phy_lock;
96 };
97 static u8 len_seq[] = { 16, 24, 12, 29 };
98 static u16 wait_tab[] = { 2, 3, 5, 15, 20, 40};
99
100 #define I2C_DUMP_SKB(info, skb) \
101 do { \
102 pr_debug("%s:\n", info); \
103 print_hex_dump(KERN_DEBUG, "i2c: ", DUMP_PREFIX_OFFSET, \
104 16, 1, (skb)->data, (skb)->len, 0); \
105 } while (0)
106
107 /*
108 * In order to get the CLF in a known state we generate an internal reboot
109 * using a proprietary command.
110 * Once the reboot is completed, we expect to receive a ST21NFCA_SOF_EOF
111 * fill buffer.
112 */
st21nfca_hci_platform_init(struct st21nfca_i2c_phy * phy)113 static int st21nfca_hci_platform_init(struct st21nfca_i2c_phy *phy)
114 {
115 u16 wait_reboot[] = { 50, 300, 1000 };
116 char reboot_cmd[] = { 0x7E, 0x66, 0x48, 0xF6, 0x7E };
117 u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE];
118 int i, r = -1;
119
120 for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) {
121 r = i2c_master_send(phy->i2c_dev, reboot_cmd,
122 sizeof(reboot_cmd));
123 if (r < 0)
124 msleep(wait_reboot[i]);
125 }
126 if (r < 0)
127 return r;
128
129 /* CLF is spending about 20ms to do an internal reboot */
130 msleep(20);
131 r = -1;
132 for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) {
133 r = i2c_master_recv(phy->i2c_dev, tmp,
134 ST21NFCA_HCI_LLC_MAX_SIZE);
135 if (r < 0)
136 msleep(wait_reboot[i]);
137 }
138 if (r < 0)
139 return r;
140
141 for (i = 0; i < ST21NFCA_HCI_LLC_MAX_SIZE &&
142 tmp[i] == ST21NFCA_SOF_EOF; i++)
143 ;
144
145 if (r != ST21NFCA_HCI_LLC_MAX_SIZE)
146 return -ENODEV;
147
148 usleep_range(1000, 1500);
149 return 0;
150 }
151
st21nfca_hci_i2c_enable(void * phy_id)152 static int st21nfca_hci_i2c_enable(void *phy_id)
153 {
154 struct st21nfca_i2c_phy *phy = phy_id;
155
156 gpio_set_value(phy->gpio_ena, 1);
157 phy->powered = 1;
158 phy->run_mode = ST21NFCA_HCI_MODE;
159
160 usleep_range(10000, 15000);
161
162 return 0;
163 }
164
st21nfca_hci_i2c_disable(void * phy_id)165 static void st21nfca_hci_i2c_disable(void *phy_id)
166 {
167 struct st21nfca_i2c_phy *phy = phy_id;
168
169 pr_info("\n");
170 gpio_set_value(phy->gpio_ena, 0);
171
172 phy->powered = 0;
173 }
174
st21nfca_hci_add_len_crc(struct sk_buff * skb)175 static void st21nfca_hci_add_len_crc(struct sk_buff *skb)
176 {
177 u16 crc;
178 u8 tmp;
179
180 *skb_push(skb, 1) = 0;
181
182 crc = crc_ccitt(0xffff, skb->data, skb->len);
183 crc = ~crc;
184
185 tmp = crc & 0x00ff;
186 *skb_put(skb, 1) = tmp;
187
188 tmp = (crc >> 8) & 0x00ff;
189 *skb_put(skb, 1) = tmp;
190 }
191
st21nfca_hci_remove_len_crc(struct sk_buff * skb)192 static void st21nfca_hci_remove_len_crc(struct sk_buff *skb)
193 {
194 skb_pull(skb, ST21NFCA_FRAME_HEADROOM);
195 skb_trim(skb, skb->len - ST21NFCA_FRAME_TAILROOM);
196 }
197
198 /*
199 * Writing a frame must not return the number of written bytes.
200 * It must return either zero for success, or <0 for error.
201 * In addition, it must not alter the skb
202 */
st21nfca_hci_i2c_write(void * phy_id,struct sk_buff * skb)203 static int st21nfca_hci_i2c_write(void *phy_id, struct sk_buff *skb)
204 {
205 int r = -1, i, j;
206 struct st21nfca_i2c_phy *phy = phy_id;
207 struct i2c_client *client = phy->i2c_dev;
208 u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE * 2];
209
210 I2C_DUMP_SKB("st21nfca_hci_i2c_write", skb);
211
212
213 if (phy->hard_fault != 0)
214 return phy->hard_fault;
215
216 /*
217 * Compute CRC before byte stuffing computation on frame
218 * Note st21nfca_hci_add_len_crc is doing a byte stuffing
219 * on its own value
220 */
221 st21nfca_hci_add_len_crc(skb);
222
223 /* add ST21NFCA_SOF_EOF on tail */
224 *skb_put(skb, 1) = ST21NFCA_SOF_EOF;
225 /* add ST21NFCA_SOF_EOF on head */
226 *skb_push(skb, 1) = ST21NFCA_SOF_EOF;
227
228 /*
229 * Compute byte stuffing
230 * if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING
231 * insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte)
232 * xor byte with ST21NFCA_BYTE_STUFFING_MASK
233 */
234 tmp[0] = skb->data[0];
235 for (i = 1, j = 1; i < skb->len - 1; i++, j++) {
236 if (skb->data[i] == ST21NFCA_SOF_EOF
237 || skb->data[i] == ST21NFCA_ESCAPE_BYTE_STUFFING) {
238 tmp[j] = ST21NFCA_ESCAPE_BYTE_STUFFING;
239 j++;
240 tmp[j] = skb->data[i] ^ ST21NFCA_BYTE_STUFFING_MASK;
241 } else {
242 tmp[j] = skb->data[i];
243 }
244 }
245 tmp[j] = skb->data[i];
246 j++;
247
248 /*
249 * Manage sleep mode
250 * Try 3 times to send data with delay between each
251 */
252 mutex_lock(&phy->phy_lock);
253 for (i = 0; i < ARRAY_SIZE(wait_tab) && r < 0; i++) {
254 r = i2c_master_send(client, tmp, j);
255 if (r < 0)
256 msleep(wait_tab[i]);
257 }
258 mutex_unlock(&phy->phy_lock);
259
260 if (r >= 0) {
261 if (r != j)
262 r = -EREMOTEIO;
263 else
264 r = 0;
265 }
266
267 st21nfca_hci_remove_len_crc(skb);
268
269 return r;
270 }
271
get_frame_size(u8 * buf,int buflen)272 static int get_frame_size(u8 *buf, int buflen)
273 {
274 int len = 0;
275
276 if (buf[len + 1] == ST21NFCA_SOF_EOF)
277 return 0;
278
279 for (len = 1; len < buflen && buf[len] != ST21NFCA_SOF_EOF; len++)
280 ;
281
282 return len;
283 }
284
check_crc(u8 * buf,int buflen)285 static int check_crc(u8 *buf, int buflen)
286 {
287 u16 crc;
288
289 crc = crc_ccitt(0xffff, buf, buflen - 2);
290 crc = ~crc;
291
292 if (buf[buflen - 2] != (crc & 0xff) || buf[buflen - 1] != (crc >> 8)) {
293 pr_err(ST21NFCA_HCI_DRIVER_NAME
294 ": CRC error 0x%x != 0x%x 0x%x\n", crc, buf[buflen - 1],
295 buf[buflen - 2]);
296
297 pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__);
298 print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
299 16, 2, buf, buflen, false);
300 return -EPERM;
301 }
302 return 0;
303 }
304
305 /*
306 * Prepare received data for upper layer.
307 * Received data include byte stuffing, crc and sof/eof
308 * which is not usable by hci part.
309 * returns:
310 * frame size without sof/eof, header and byte stuffing
311 * -EBADMSG : frame was incorrect and discarded
312 */
st21nfca_hci_i2c_repack(struct sk_buff * skb)313 static int st21nfca_hci_i2c_repack(struct sk_buff *skb)
314 {
315 int i, j, r, size;
316
317 if (skb->len < 1 || (skb->len > 1 && skb->data[1] != 0))
318 return -EBADMSG;
319
320 size = get_frame_size(skb->data, skb->len);
321 if (size > 0) {
322 skb_trim(skb, size);
323 /* remove ST21NFCA byte stuffing for upper layer */
324 for (i = 1, j = 0; i < skb->len; i++) {
325 if (skb->data[i + j] ==
326 (u8) ST21NFCA_ESCAPE_BYTE_STUFFING) {
327 skb->data[i] = skb->data[i + j + 1]
328 | ST21NFCA_BYTE_STUFFING_MASK;
329 i++;
330 j++;
331 }
332 skb->data[i] = skb->data[i + j];
333 }
334 /* remove byte stuffing useless byte */
335 skb_trim(skb, i - j);
336 /* remove ST21NFCA_SOF_EOF from head */
337 skb_pull(skb, 1);
338
339 r = check_crc(skb->data, skb->len);
340 if (r != 0) {
341 i = 0;
342 return -EBADMSG;
343 }
344
345 /* remove headbyte */
346 skb_pull(skb, 1);
347 /* remove crc. Byte Stuffing is already removed here */
348 skb_trim(skb, skb->len - 2);
349 return skb->len;
350 }
351 return 0;
352 }
353
354 /*
355 * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees
356 * that i2c bus will be flushed and that next read will start on a new frame.
357 * returned skb contains only LLC header and payload.
358 * returns:
359 * frame size : if received frame is complete (find ST21NFCA_SOF_EOF at
360 * end of read)
361 * -EAGAIN : if received frame is incomplete (not find ST21NFCA_SOF_EOF
362 * at end of read)
363 * -EREMOTEIO : i2c read error (fatal)
364 * -EBADMSG : frame was incorrect and discarded
365 * (value returned from st21nfca_hci_i2c_repack)
366 * -EIO : if no ST21NFCA_SOF_EOF is found after reaching
367 * the read length end sequence
368 */
st21nfca_hci_i2c_read(struct st21nfca_i2c_phy * phy,struct sk_buff * skb)369 static int st21nfca_hci_i2c_read(struct st21nfca_i2c_phy *phy,
370 struct sk_buff *skb)
371 {
372 int r, i;
373 u8 len;
374 u8 buf[ST21NFCA_HCI_LLC_MAX_PAYLOAD];
375 struct i2c_client *client = phy->i2c_dev;
376
377 if (phy->current_read_len < ARRAY_SIZE(len_seq)) {
378 len = len_seq[phy->current_read_len];
379
380 /*
381 * Add retry mecanism
382 * Operation on I2C interface may fail in case of operation on
383 * RF or SWP interface
384 */
385 r = 0;
386 mutex_lock(&phy->phy_lock);
387 for (i = 0; i < ARRAY_SIZE(wait_tab) && r <= 0; i++) {
388 r = i2c_master_recv(client, buf, len);
389 if (r < 0)
390 msleep(wait_tab[i]);
391 }
392 mutex_unlock(&phy->phy_lock);
393
394 if (r != len) {
395 phy->current_read_len = 0;
396 return -EREMOTEIO;
397 }
398
399 /*
400 * The first read sequence does not start with SOF.
401 * Data is corrupeted so we drop it.
402 */
403 if (!phy->current_read_len && !IS_START_OF_FRAME(buf)) {
404 skb_trim(skb, 0);
405 phy->current_read_len = 0;
406 return -EIO;
407 } else if (phy->current_read_len && IS_START_OF_FRAME(buf)) {
408 /*
409 * Previous frame transmission was interrupted and
410 * the frame got repeated.
411 * Received frame start with ST21NFCA_SOF_EOF + 00.
412 */
413 skb_trim(skb, 0);
414 phy->current_read_len = 0;
415 }
416
417 memcpy(skb_put(skb, len), buf, len);
418
419 if (skb->data[skb->len - 1] == ST21NFCA_SOF_EOF) {
420 phy->current_read_len = 0;
421 return st21nfca_hci_i2c_repack(skb);
422 }
423 phy->current_read_len++;
424 return -EAGAIN;
425 }
426 return -EIO;
427 }
428
429 /*
430 * Reads an shdlc frame from the chip. This is not as straightforward as it
431 * seems. The frame format is data-crc, and corruption can occur anywhere
432 * while transiting on i2c bus, such that we could read an invalid data.
433 * The tricky case is when we read a corrupted data or crc. We must detect
434 * this here in order to determine that data can be transmitted to the hci
435 * core. This is the reason why we check the crc here.
436 * The CLF will repeat a frame until we send a RR on that frame.
437 *
438 * On ST21NFCA, IRQ goes in idle when read starts. As no size information are
439 * available in the incoming data, other IRQ might come. Every IRQ will trigger
440 * a read sequence with different length and will fill the current frame.
441 * The reception is complete once we reach a ST21NFCA_SOF_EOF.
442 */
st21nfca_hci_irq_thread_fn(int irq,void * phy_id)443 static irqreturn_t st21nfca_hci_irq_thread_fn(int irq, void *phy_id)
444 {
445 struct st21nfca_i2c_phy *phy = phy_id;
446 struct i2c_client *client;
447
448 int r;
449
450 if (!phy || irq != phy->i2c_dev->irq) {
451 WARN_ON_ONCE(1);
452 return IRQ_NONE;
453 }
454
455 client = phy->i2c_dev;
456 dev_dbg(&client->dev, "IRQ\n");
457
458 if (phy->hard_fault != 0)
459 return IRQ_HANDLED;
460
461 r = st21nfca_hci_i2c_read(phy, phy->pending_skb);
462 if (r == -EREMOTEIO) {
463 phy->hard_fault = r;
464
465 nfc_hci_recv_frame(phy->hdev, NULL);
466
467 return IRQ_HANDLED;
468 } else if (r == -EAGAIN || r == -EIO) {
469 return IRQ_HANDLED;
470 } else if (r == -EBADMSG && phy->crc_trials < ARRAY_SIZE(wait_tab)) {
471 /*
472 * With ST21NFCA, only one interface (I2C, RF or SWP)
473 * may be active at a time.
474 * Having incorrect crc is usually due to i2c macrocell
475 * deactivation in the middle of a transmission.
476 * It may generate corrupted data on i2c.
477 * We give sometime to get i2c back.
478 * The complete frame will be repeated.
479 */
480 msleep(wait_tab[phy->crc_trials]);
481 phy->crc_trials++;
482 phy->current_read_len = 0;
483 kfree_skb(phy->pending_skb);
484 } else if (r > 0) {
485 /*
486 * We succeeded to read data from the CLF and
487 * data is valid.
488 * Reset counter.
489 */
490 nfc_hci_recv_frame(phy->hdev, phy->pending_skb);
491 phy->crc_trials = 0;
492 } else {
493 kfree_skb(phy->pending_skb);
494 }
495
496 phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL);
497 if (phy->pending_skb == NULL) {
498 phy->hard_fault = -ENOMEM;
499 nfc_hci_recv_frame(phy->hdev, NULL);
500 }
501
502 return IRQ_HANDLED;
503 }
504
505 static struct nfc_phy_ops i2c_phy_ops = {
506 .write = st21nfca_hci_i2c_write,
507 .enable = st21nfca_hci_i2c_enable,
508 .disable = st21nfca_hci_i2c_disable,
509 };
510
511 #ifdef CONFIG_OF
st21nfca_hci_i2c_of_request_resources(struct i2c_client * client)512 static int st21nfca_hci_i2c_of_request_resources(struct i2c_client *client)
513 {
514 struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
515 struct device_node *pp;
516 int gpio;
517 int r;
518
519 pp = client->dev.of_node;
520 if (!pp)
521 return -ENODEV;
522
523 /* Get GPIO from device tree */
524 gpio = of_get_named_gpio(pp, "enable-gpios", 0);
525 if (gpio < 0) {
526 nfc_err(&client->dev, "Failed to retrieve enable-gpios from device tree\n");
527 return gpio;
528 }
529
530 /* GPIO request and configuration */
531 r = devm_gpio_request_one(&client->dev, gpio, GPIOF_OUT_INIT_HIGH,
532 "clf_enable");
533 if (r) {
534 nfc_err(&client->dev, "Failed to request enable pin\n");
535 return r;
536 }
537
538 phy->gpio_ena = gpio;
539
540 phy->irq_polarity = irq_get_trigger_type(client->irq);
541
542 phy->se_status.is_ese_present =
543 of_property_read_bool(pp, "ese-present");
544 phy->se_status.is_uicc_present =
545 of_property_read_bool(pp, "uicc-present");
546
547 return 0;
548 }
549 #else
st21nfca_hci_i2c_of_request_resources(struct i2c_client * client)550 static int st21nfca_hci_i2c_of_request_resources(struct i2c_client *client)
551 {
552 return -ENODEV;
553 }
554 #endif
555
st21nfca_hci_i2c_request_resources(struct i2c_client * client)556 static int st21nfca_hci_i2c_request_resources(struct i2c_client *client)
557 {
558 struct st21nfca_nfc_platform_data *pdata;
559 struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
560 int r;
561
562 pdata = client->dev.platform_data;
563 if (pdata == NULL) {
564 nfc_err(&client->dev, "No platform data\n");
565 return -EINVAL;
566 }
567
568 /* store for later use */
569 phy->gpio_ena = pdata->gpio_ena;
570 phy->irq_polarity = pdata->irq_polarity;
571
572 if (phy->gpio_ena > 0) {
573 r = devm_gpio_request_one(&client->dev, phy->gpio_ena,
574 GPIOF_OUT_INIT_HIGH, "clf_enable");
575 if (r) {
576 pr_err("%s : ena gpio_request failed\n", __FILE__);
577 return r;
578 }
579 }
580
581 phy->se_status.is_ese_present = pdata->is_ese_present;
582 phy->se_status.is_uicc_present = pdata->is_uicc_present;
583
584 return 0;
585 }
586
st21nfca_hci_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)587 static int st21nfca_hci_i2c_probe(struct i2c_client *client,
588 const struct i2c_device_id *id)
589 {
590 struct st21nfca_i2c_phy *phy;
591 struct st21nfca_nfc_platform_data *pdata;
592 int r;
593
594 dev_dbg(&client->dev, "%s\n", __func__);
595 dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
596
597 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
598 nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
599 return -ENODEV;
600 }
601
602 phy = devm_kzalloc(&client->dev, sizeof(struct st21nfca_i2c_phy),
603 GFP_KERNEL);
604 if (!phy)
605 return -ENOMEM;
606
607 phy->i2c_dev = client;
608 phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL);
609 if (phy->pending_skb == NULL)
610 return -ENOMEM;
611
612 phy->current_read_len = 0;
613 phy->crc_trials = 0;
614 mutex_init(&phy->phy_lock);
615 i2c_set_clientdata(client, phy);
616
617 pdata = client->dev.platform_data;
618 if (!pdata && client->dev.of_node) {
619 r = st21nfca_hci_i2c_of_request_resources(client);
620 if (r) {
621 nfc_err(&client->dev, "No platform data\n");
622 return r;
623 }
624 } else if (pdata) {
625 r = st21nfca_hci_i2c_request_resources(client);
626 if (r) {
627 nfc_err(&client->dev, "Cannot get platform resources\n");
628 return r;
629 }
630 } else {
631 nfc_err(&client->dev, "st21nfca platform resources not available\n");
632 return -ENODEV;
633 }
634
635 r = st21nfca_hci_platform_init(phy);
636 if (r < 0) {
637 nfc_err(&client->dev, "Unable to reboot st21nfca\n");
638 return r;
639 }
640
641 r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
642 st21nfca_hci_irq_thread_fn,
643 phy->irq_polarity | IRQF_ONESHOT,
644 ST21NFCA_HCI_DRIVER_NAME, phy);
645 if (r < 0) {
646 nfc_err(&client->dev, "Unable to register IRQ handler\n");
647 return r;
648 }
649
650 return st21nfca_hci_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME,
651 ST21NFCA_FRAME_HEADROOM,
652 ST21NFCA_FRAME_TAILROOM,
653 ST21NFCA_HCI_LLC_MAX_PAYLOAD,
654 &phy->hdev,
655 &phy->se_status);
656 }
657
st21nfca_hci_i2c_remove(struct i2c_client * client)658 static int st21nfca_hci_i2c_remove(struct i2c_client *client)
659 {
660 struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
661
662 dev_dbg(&client->dev, "%s\n", __func__);
663
664 st21nfca_hci_remove(phy->hdev);
665
666 if (phy->powered)
667 st21nfca_hci_i2c_disable(phy);
668
669 return 0;
670 }
671
672 #ifdef CONFIG_OF
673 static const struct of_device_id of_st21nfca_i2c_match[] = {
674 { .compatible = "st,st21nfca-i2c", },
675 { .compatible = "st,st21nfca_i2c", },
676 {}
677 };
678 MODULE_DEVICE_TABLE(of, of_st21nfca_i2c_match);
679 #endif
680
681 static struct i2c_driver st21nfca_hci_i2c_driver = {
682 .driver = {
683 .owner = THIS_MODULE,
684 .name = ST21NFCA_HCI_I2C_DRIVER_NAME,
685 .of_match_table = of_match_ptr(of_st21nfca_i2c_match),
686 },
687 .probe = st21nfca_hci_i2c_probe,
688 .id_table = st21nfca_hci_i2c_id_table,
689 .remove = st21nfca_hci_i2c_remove,
690 };
691
692 module_i2c_driver(st21nfca_hci_i2c_driver);
693
694 MODULE_LICENSE("GPL");
695 MODULE_DESCRIPTION(DRIVER_DESC);
696