networking: add and use skb_put_u8()
[sfrench/cifs-2.6.git] / drivers / nfc / st21nfca / i2c.c
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/consumer.h>
24 #include <linux/of_irq.h>
25 #include <linux/of_gpio.h>
26 #include <linux/acpi.h>
27 #include <linux/interrupt.h>
28 #include <linux/delay.h>
29 #include <linux/nfc.h>
30 #include <linux/firmware.h>
31
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_DRIVER_NAME "st21nfca_hci"
62 #define ST21NFCA_HCI_I2C_DRIVER_NAME "st21nfca_hci_i2c"
63
64 #define ST21NFCA_GPIO_NAME_EN "enable"
65
66 struct st21nfca_i2c_phy {
67         struct i2c_client *i2c_dev;
68         struct nfc_hci_dev *hdev;
69
70         struct gpio_desc *gpiod_ena;
71         struct st21nfca_se_status se_status;
72
73         struct sk_buff *pending_skb;
74         int current_read_len;
75         /*
76          * crc might have fail because i2c macro
77          * is disable due to other interface activity
78          */
79         int crc_trials;
80
81         int powered;
82         int run_mode;
83
84         /*
85          * < 0 if hardware error occured (e.g. i2c err)
86          * and prevents normal operation.
87          */
88         int hard_fault;
89         struct mutex phy_lock;
90 };
91
92 static u8 len_seq[] = { 16, 24, 12, 29 };
93 static u16 wait_tab[] = { 2, 3, 5, 15, 20, 40};
94
95 #define I2C_DUMP_SKB(info, skb)                                 \
96 do {                                                            \
97         pr_debug("%s:\n", info);                                \
98         print_hex_dump(KERN_DEBUG, "i2c: ", DUMP_PREFIX_OFFSET, \
99                        16, 1, (skb)->data, (skb)->len, 0);      \
100 } while (0)
101
102 /*
103  * In order to get the CLF in a known state we generate an internal reboot
104  * using a proprietary command.
105  * Once the reboot is completed, we expect to receive a ST21NFCA_SOF_EOF
106  * fill buffer.
107  */
108 static int st21nfca_hci_platform_init(struct st21nfca_i2c_phy *phy)
109 {
110         u16 wait_reboot[] = { 50, 300, 1000 };
111         char reboot_cmd[] = { 0x7E, 0x66, 0x48, 0xF6, 0x7E };
112         u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE];
113         int i, r = -1;
114
115         for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) {
116                 r = i2c_master_send(phy->i2c_dev, reboot_cmd,
117                                     sizeof(reboot_cmd));
118                 if (r < 0)
119                         msleep(wait_reboot[i]);
120         }
121         if (r < 0)
122                 return r;
123
124         /* CLF is spending about 20ms to do an internal reboot */
125         msleep(20);
126         r = -1;
127         for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) {
128                 r = i2c_master_recv(phy->i2c_dev, tmp,
129                                     ST21NFCA_HCI_LLC_MAX_SIZE);
130                 if (r < 0)
131                         msleep(wait_reboot[i]);
132         }
133         if (r < 0)
134                 return r;
135
136         for (i = 0; i < ST21NFCA_HCI_LLC_MAX_SIZE &&
137                 tmp[i] == ST21NFCA_SOF_EOF; i++)
138                 ;
139
140         if (r != ST21NFCA_HCI_LLC_MAX_SIZE)
141                 return -ENODEV;
142
143         usleep_range(1000, 1500);
144         return 0;
145 }
146
147 static int st21nfca_hci_i2c_enable(void *phy_id)
148 {
149         struct st21nfca_i2c_phy *phy = phy_id;
150
151         gpiod_set_value(phy->gpiod_ena, 1);
152         phy->powered = 1;
153         phy->run_mode = ST21NFCA_HCI_MODE;
154
155         usleep_range(10000, 15000);
156
157         return 0;
158 }
159
160 static void st21nfca_hci_i2c_disable(void *phy_id)
161 {
162         struct st21nfca_i2c_phy *phy = phy_id;
163
164         gpiod_set_value(phy->gpiod_ena, 0);
165
166         phy->powered = 0;
167 }
168
169 static void st21nfca_hci_add_len_crc(struct sk_buff *skb)
170 {
171         u16 crc;
172         u8 tmp;
173
174         *(u8 *)skb_push(skb, 1) = 0;
175
176         crc = crc_ccitt(0xffff, skb->data, skb->len);
177         crc = ~crc;
178
179         tmp = crc & 0x00ff;
180         skb_put_u8(skb, tmp);
181
182         tmp = (crc >> 8) & 0x00ff;
183         skb_put_u8(skb, tmp);
184 }
185
186 static void st21nfca_hci_remove_len_crc(struct sk_buff *skb)
187 {
188         skb_pull(skb, ST21NFCA_FRAME_HEADROOM);
189         skb_trim(skb, skb->len - ST21NFCA_FRAME_TAILROOM);
190 }
191
192 /*
193  * Writing a frame must not return the number of written bytes.
194  * It must return either zero for success, or <0 for error.
195  * In addition, it must not alter the skb
196  */
197 static int st21nfca_hci_i2c_write(void *phy_id, struct sk_buff *skb)
198 {
199         int r = -1, i, j;
200         struct st21nfca_i2c_phy *phy = phy_id;
201         struct i2c_client *client = phy->i2c_dev;
202         u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE * 2];
203
204         I2C_DUMP_SKB("st21nfca_hci_i2c_write", skb);
205
206         if (phy->hard_fault != 0)
207                 return phy->hard_fault;
208
209         /*
210          * Compute CRC before byte stuffing computation on frame
211          * Note st21nfca_hci_add_len_crc is doing a byte stuffing
212          * on its own value
213          */
214         st21nfca_hci_add_len_crc(skb);
215
216         /* add ST21NFCA_SOF_EOF on tail */
217         skb_put_u8(skb, ST21NFCA_SOF_EOF);
218         /* add ST21NFCA_SOF_EOF on head */
219         *(u8 *)skb_push(skb, 1) = ST21NFCA_SOF_EOF;
220
221         /*
222          * Compute byte stuffing
223          * if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING
224          * insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte)
225          * xor byte with ST21NFCA_BYTE_STUFFING_MASK
226          */
227         tmp[0] = skb->data[0];
228         for (i = 1, j = 1; i < skb->len - 1; i++, j++) {
229                 if (skb->data[i] == ST21NFCA_SOF_EOF
230                     || skb->data[i] == ST21NFCA_ESCAPE_BYTE_STUFFING) {
231                         tmp[j] = ST21NFCA_ESCAPE_BYTE_STUFFING;
232                         j++;
233                         tmp[j] = skb->data[i] ^ ST21NFCA_BYTE_STUFFING_MASK;
234                 } else {
235                         tmp[j] = skb->data[i];
236                 }
237         }
238         tmp[j] = skb->data[i];
239         j++;
240
241         /*
242          * Manage sleep mode
243          * Try 3 times to send data with delay between each
244          */
245         mutex_lock(&phy->phy_lock);
246         for (i = 0; i < ARRAY_SIZE(wait_tab) && r < 0; i++) {
247                 r = i2c_master_send(client, tmp, j);
248                 if (r < 0)
249                         msleep(wait_tab[i]);
250         }
251         mutex_unlock(&phy->phy_lock);
252
253         if (r >= 0) {
254                 if (r != j)
255                         r = -EREMOTEIO;
256                 else
257                         r = 0;
258         }
259
260         st21nfca_hci_remove_len_crc(skb);
261
262         return r;
263 }
264
265 static int get_frame_size(u8 *buf, int buflen)
266 {
267         int len = 0;
268
269         if (buf[len + 1] == ST21NFCA_SOF_EOF)
270                 return 0;
271
272         for (len = 1; len < buflen && buf[len] != ST21NFCA_SOF_EOF; len++)
273                 ;
274
275         return len;
276 }
277
278 static int check_crc(u8 *buf, int buflen)
279 {
280         u16 crc;
281
282         crc = crc_ccitt(0xffff, buf, buflen - 2);
283         crc = ~crc;
284
285         if (buf[buflen - 2] != (crc & 0xff) || buf[buflen - 1] != (crc >> 8)) {
286                 pr_err(ST21NFCA_HCI_DRIVER_NAME
287                        ": CRC error 0x%x != 0x%x 0x%x\n", crc, buf[buflen - 1],
288                        buf[buflen - 2]);
289
290                 pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__);
291                 print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
292                                16, 2, buf, buflen, false);
293                 return -EPERM;
294         }
295         return 0;
296 }
297
298 /*
299  * Prepare received data for upper layer.
300  * Received data include byte stuffing, crc and sof/eof
301  * which is not usable by hci part.
302  * returns:
303  * frame size without sof/eof, header and byte stuffing
304  * -EBADMSG : frame was incorrect and discarded
305  */
306 static int st21nfca_hci_i2c_repack(struct sk_buff *skb)
307 {
308         int i, j, r, size;
309
310         if (skb->len < 1 || (skb->len > 1 && skb->data[1] != 0))
311                 return -EBADMSG;
312
313         size = get_frame_size(skb->data, skb->len);
314         if (size > 0) {
315                 skb_trim(skb, size);
316                 /* remove ST21NFCA byte stuffing for upper layer */
317                 for (i = 1, j = 0; i < skb->len; i++) {
318                         if (skb->data[i + j] ==
319                                         (u8) ST21NFCA_ESCAPE_BYTE_STUFFING) {
320                                 skb->data[i] = skb->data[i + j + 1]
321                                                 | ST21NFCA_BYTE_STUFFING_MASK;
322                                 i++;
323                                 j++;
324                         }
325                         skb->data[i] = skb->data[i + j];
326                 }
327                 /* remove byte stuffing useless byte */
328                 skb_trim(skb, i - j);
329                 /* remove ST21NFCA_SOF_EOF from head */
330                 skb_pull(skb, 1);
331
332                 r = check_crc(skb->data, skb->len);
333                 if (r != 0) {
334                         i = 0;
335                         return -EBADMSG;
336                 }
337
338                 /* remove headbyte */
339                 skb_pull(skb, 1);
340                 /* remove crc. Byte Stuffing is already removed here */
341                 skb_trim(skb, skb->len - 2);
342                 return skb->len;
343         }
344         return 0;
345 }
346
347 /*
348  * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees
349  * that i2c bus will be flushed and that next read will start on a new frame.
350  * returned skb contains only LLC header and payload.
351  * returns:
352  * frame size : if received frame is complete (find ST21NFCA_SOF_EOF at
353  * end of read)
354  * -EAGAIN : if received frame is incomplete (not find ST21NFCA_SOF_EOF
355  * at end of read)
356  * -EREMOTEIO : i2c read error (fatal)
357  * -EBADMSG : frame was incorrect and discarded
358  * (value returned from st21nfca_hci_i2c_repack)
359  * -EIO : if no ST21NFCA_SOF_EOF is found after reaching
360  * the read length end sequence
361  */
362 static int st21nfca_hci_i2c_read(struct st21nfca_i2c_phy *phy,
363                                  struct sk_buff *skb)
364 {
365         int r, i;
366         u8 len;
367         u8 buf[ST21NFCA_HCI_LLC_MAX_PAYLOAD];
368         struct i2c_client *client = phy->i2c_dev;
369
370         if (phy->current_read_len < ARRAY_SIZE(len_seq)) {
371                 len = len_seq[phy->current_read_len];
372
373                 /*
374                  * Add retry mecanism
375                  * Operation on I2C interface may fail in case of operation on
376                  * RF or SWP interface
377                  */
378                 r = 0;
379                 mutex_lock(&phy->phy_lock);
380                 for (i = 0; i < ARRAY_SIZE(wait_tab) && r <= 0; i++) {
381                         r = i2c_master_recv(client, buf, len);
382                         if (r < 0)
383                                 msleep(wait_tab[i]);
384                 }
385                 mutex_unlock(&phy->phy_lock);
386
387                 if (r != len) {
388                         phy->current_read_len = 0;
389                         return -EREMOTEIO;
390                 }
391
392                 /*
393                  * The first read sequence does not start with SOF.
394                  * Data is corrupeted so we drop it.
395                  */
396                 if (!phy->current_read_len && !IS_START_OF_FRAME(buf)) {
397                         skb_trim(skb, 0);
398                         phy->current_read_len = 0;
399                         return -EIO;
400                 } else if (phy->current_read_len && IS_START_OF_FRAME(buf)) {
401                         /*
402                          * Previous frame transmission was interrupted and
403                          * the frame got repeated.
404                          * Received frame start with ST21NFCA_SOF_EOF + 00.
405                          */
406                         skb_trim(skb, 0);
407                         phy->current_read_len = 0;
408                 }
409
410                 skb_put_data(skb, buf, len);
411
412                 if (skb->data[skb->len - 1] == ST21NFCA_SOF_EOF) {
413                         phy->current_read_len = 0;
414                         return st21nfca_hci_i2c_repack(skb);
415                 }
416                 phy->current_read_len++;
417                 return -EAGAIN;
418         }
419         return -EIO;
420 }
421
422 /*
423  * Reads an shdlc frame from the chip. This is not as straightforward as it
424  * seems. The frame format is data-crc, and corruption can occur anywhere
425  * while transiting on i2c bus, such that we could read an invalid data.
426  * The tricky case is when we read a corrupted data or crc. We must detect
427  * this here in order to determine that data can be transmitted to the hci
428  * core. This is the reason why we check the crc here.
429  * The CLF will repeat a frame until we send a RR on that frame.
430  *
431  * On ST21NFCA, IRQ goes in idle when read starts. As no size information are
432  * available in the incoming data, other IRQ might come. Every IRQ will trigger
433  * a read sequence with different length and will fill the current frame.
434  * The reception is complete once we reach a ST21NFCA_SOF_EOF.
435  */
436 static irqreturn_t st21nfca_hci_irq_thread_fn(int irq, void *phy_id)
437 {
438         struct st21nfca_i2c_phy *phy = phy_id;
439         struct i2c_client *client;
440
441         int r;
442
443         if (!phy || irq != phy->i2c_dev->irq) {
444                 WARN_ON_ONCE(1);
445                 return IRQ_NONE;
446         }
447
448         client = phy->i2c_dev;
449         dev_dbg(&client->dev, "IRQ\n");
450
451         if (phy->hard_fault != 0)
452                 return IRQ_HANDLED;
453
454         r = st21nfca_hci_i2c_read(phy, phy->pending_skb);
455         if (r == -EREMOTEIO) {
456                 phy->hard_fault = r;
457
458                 nfc_hci_recv_frame(phy->hdev, NULL);
459
460                 return IRQ_HANDLED;
461         } else if (r == -EAGAIN || r == -EIO) {
462                 return IRQ_HANDLED;
463         } else if (r == -EBADMSG && phy->crc_trials < ARRAY_SIZE(wait_tab)) {
464                 /*
465                  * With ST21NFCA, only one interface (I2C, RF or SWP)
466                  * may be active at a time.
467                  * Having incorrect crc is usually due to i2c macrocell
468                  * deactivation in the middle of a transmission.
469                  * It may generate corrupted data on i2c.
470                  * We give sometime to get i2c back.
471                  * The complete frame will be repeated.
472                  */
473                 msleep(wait_tab[phy->crc_trials]);
474                 phy->crc_trials++;
475                 phy->current_read_len = 0;
476                 kfree_skb(phy->pending_skb);
477         } else if (r > 0) {
478                 /*
479                  * We succeeded to read data from the CLF and
480                  * data is valid.
481                  * Reset counter.
482                  */
483                 nfc_hci_recv_frame(phy->hdev, phy->pending_skb);
484                 phy->crc_trials = 0;
485         } else {
486                 kfree_skb(phy->pending_skb);
487         }
488
489         phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL);
490         if (phy->pending_skb == NULL) {
491                 phy->hard_fault = -ENOMEM;
492                 nfc_hci_recv_frame(phy->hdev, NULL);
493         }
494
495         return IRQ_HANDLED;
496 }
497
498 static struct nfc_phy_ops i2c_phy_ops = {
499         .write = st21nfca_hci_i2c_write,
500         .enable = st21nfca_hci_i2c_enable,
501         .disable = st21nfca_hci_i2c_disable,
502 };
503
504 static int st21nfca_hci_i2c_acpi_request_resources(struct i2c_client *client)
505 {
506         struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
507         struct device *dev = &client->dev;
508
509         /* Get EN GPIO from ACPI */
510         phy->gpiod_ena = devm_gpiod_get_index(dev, ST21NFCA_GPIO_NAME_EN, 1,
511                                               GPIOD_OUT_LOW);
512         if (IS_ERR(phy->gpiod_ena)) {
513                 nfc_err(dev, "Unable to get ENABLE GPIO\n");
514                 return PTR_ERR(phy->gpiod_ena);
515         }
516
517         return 0;
518 }
519
520 static int st21nfca_hci_i2c_of_request_resources(struct i2c_client *client)
521 {
522         struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
523         struct device *dev = &client->dev;
524
525         /* Get GPIO from device tree */
526         phy->gpiod_ena = devm_gpiod_get_index(dev, ST21NFCA_GPIO_NAME_EN, 0,
527                                               GPIOD_OUT_HIGH);
528         if (IS_ERR(phy->gpiod_ena)) {
529                 nfc_err(dev, "Failed to request enable pin\n");
530                 return PTR_ERR(phy->gpiod_ena);
531         }
532
533         return 0;
534 }
535
536 static int st21nfca_hci_i2c_probe(struct i2c_client *client,
537                                   const struct i2c_device_id *id)
538 {
539         struct st21nfca_i2c_phy *phy;
540         int r;
541
542         dev_dbg(&client->dev, "%s\n", __func__);
543         dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
544
545         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
546                 nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
547                 return -ENODEV;
548         }
549
550         phy = devm_kzalloc(&client->dev, sizeof(struct st21nfca_i2c_phy),
551                            GFP_KERNEL);
552         if (!phy)
553                 return -ENOMEM;
554
555         phy->i2c_dev = client;
556         phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL);
557         if (phy->pending_skb == NULL)
558                 return -ENOMEM;
559
560         phy->current_read_len = 0;
561         phy->crc_trials = 0;
562         mutex_init(&phy->phy_lock);
563         i2c_set_clientdata(client, phy);
564
565         if (client->dev.of_node) {
566                 r = st21nfca_hci_i2c_of_request_resources(client);
567                 if (r) {
568                         nfc_err(&client->dev, "No platform data\n");
569                         return r;
570                 }
571         } else if (ACPI_HANDLE(&client->dev)) {
572                 r = st21nfca_hci_i2c_acpi_request_resources(client);
573                 if (r) {
574                         nfc_err(&client->dev, "Cannot get ACPI data\n");
575                         return r;
576                 }
577         } else {
578                 nfc_err(&client->dev, "st21nfca platform resources not available\n");
579                 return -ENODEV;
580         }
581
582         phy->se_status.is_ese_present =
583                         device_property_read_bool(&client->dev, "ese-present");
584         phy->se_status.is_uicc_present =
585                         device_property_read_bool(&client->dev, "uicc-present");
586
587         r = st21nfca_hci_platform_init(phy);
588         if (r < 0) {
589                 nfc_err(&client->dev, "Unable to reboot st21nfca\n");
590                 return r;
591         }
592
593         r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
594                                 st21nfca_hci_irq_thread_fn,
595                                 IRQF_ONESHOT,
596                                 ST21NFCA_HCI_DRIVER_NAME, phy);
597         if (r < 0) {
598                 nfc_err(&client->dev, "Unable to register IRQ handler\n");
599                 return r;
600         }
601
602         return st21nfca_hci_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME,
603                                         ST21NFCA_FRAME_HEADROOM,
604                                         ST21NFCA_FRAME_TAILROOM,
605                                         ST21NFCA_HCI_LLC_MAX_PAYLOAD,
606                                         &phy->hdev,
607                                         &phy->se_status);
608 }
609
610 static int st21nfca_hci_i2c_remove(struct i2c_client *client)
611 {
612         struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
613
614         dev_dbg(&client->dev, "%s\n", __func__);
615
616         st21nfca_hci_remove(phy->hdev);
617
618         if (phy->powered)
619                 st21nfca_hci_i2c_disable(phy);
620
621         return 0;
622 }
623
624 static struct i2c_device_id st21nfca_hci_i2c_id_table[] = {
625         {ST21NFCA_HCI_DRIVER_NAME, 0},
626         {}
627 };
628 MODULE_DEVICE_TABLE(i2c, st21nfca_hci_i2c_id_table);
629
630 static const struct acpi_device_id st21nfca_hci_i2c_acpi_match[] = {
631         {"SMO2100", 0},
632         {}
633 };
634 MODULE_DEVICE_TABLE(acpi, st21nfca_hci_i2c_acpi_match);
635
636 static const struct of_device_id of_st21nfca_i2c_match[] = {
637         { .compatible = "st,st21nfca-i2c", },
638         { .compatible = "st,st21nfca_i2c", },
639         {}
640 };
641 MODULE_DEVICE_TABLE(of, of_st21nfca_i2c_match);
642
643 static struct i2c_driver st21nfca_hci_i2c_driver = {
644         .driver = {
645                 .name = ST21NFCA_HCI_I2C_DRIVER_NAME,
646                 .of_match_table = of_match_ptr(of_st21nfca_i2c_match),
647                 .acpi_match_table = ACPI_PTR(st21nfca_hci_i2c_acpi_match),
648         },
649         .probe = st21nfca_hci_i2c_probe,
650         .id_table = st21nfca_hci_i2c_id_table,
651         .remove = st21nfca_hci_i2c_remove,
652 };
653 module_i2c_driver(st21nfca_hci_i2c_driver);
654
655 MODULE_LICENSE("GPL");
656 MODULE_DESCRIPTION(DRIVER_DESC);