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 struct st21nfca_i2c_phy {
  65         struct i2c_client *i2c_dev;
  66         struct nfc_hci_dev *hdev;
  67
  68         struct gpio_desc *gpiod_ena;
  69         struct st21nfca_se_status se_status;
  70
  71         struct sk_buff *pending_skb;
  72         int current_read_len;
  73         /*
  74          * crc might have fail because i2c macro
  75          * is disable due to other interface activity
  76          */
  77         int crc_trials;
  78
  79         int powered;
  80         int run_mode;
  81
  82         /*
  83          * < 0 if hardware error occured (e.g. i2c err)
  84          * and prevents normal operation.
  85          */
  86         int hard_fault;
  87         struct mutex phy_lock;
  88 };
  89
  90 static u8 len_seq[] = { 16, 24, 12, 29 };
  91 static u16 wait_tab[] = { 2, 3, 5, 15, 20, 40};
  92
  93 #define I2C_DUMP_SKB(info, skb)                                 \
  94 do {                                                            \
  95         pr_debug("%s:\n", info);                                \
  96         print_hex_dump(KERN_DEBUG, "i2c: ", DUMP_PREFIX_OFFSET, \
  97                        16, 1, (skb)->data, (skb)->len, 0);      \
  98 } while (0)
  99
 100 /*
 101  * In order to get the CLF in a known state we generate an internal reboot
 102  * using a proprietary command.
 103  * Once the reboot is completed, we expect to receive a ST21NFCA_SOF_EOF
 104  * fill buffer.
 105  */
 106 static int st21nfca_hci_platform_init(struct st21nfca_i2c_phy *phy)
 107 {
 108         u16 wait_reboot[] = { 50, 300, 1000 };
 109         char reboot_cmd[] = { 0x7E, 0x66, 0x48, 0xF6, 0x7E };
 110         u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE];
 111         int i, r = -1;
 112
 113         for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) {
 114                 r = i2c_master_send(phy->i2c_dev, reboot_cmd,
 115                                     sizeof(reboot_cmd));
 116                 if (r < 0)
 117                         msleep(wait_reboot[i]);
 118         }
 119         if (r < 0)
 120                 return r;
 121
 122         /* CLF is spending about 20ms to do an internal reboot */
 123         msleep(20);
 124         r = -1;
 125         for (i = 0; i < ARRAY_SIZE(wait_reboot) && r < 0; i++) {
 126                 r = i2c_master_recv(phy->i2c_dev, tmp,
 127                                     ST21NFCA_HCI_LLC_MAX_SIZE);
 128                 if (r < 0)
 129                         msleep(wait_reboot[i]);
 130         }
 131         if (r < 0)
 132                 return r;
 133
 134         for (i = 0; i < ST21NFCA_HCI_LLC_MAX_SIZE &&
 135                 tmp[i] == ST21NFCA_SOF_EOF; i++)
 136                 ;
 137
 138         if (r != ST21NFCA_HCI_LLC_MAX_SIZE)
 139                 return -ENODEV;
 140
 141         usleep_range(1000, 1500);
 142         return 0;
 143 }
 144
 145 static int st21nfca_hci_i2c_enable(void *phy_id)
 146 {
 147         struct st21nfca_i2c_phy *phy = phy_id;
 148
 149         gpiod_set_value(phy->gpiod_ena, 1);
 150         phy->powered = 1;
 151         phy->run_mode = ST21NFCA_HCI_MODE;
 152
 153         usleep_range(10000, 15000);
 154
 155         return 0;
 156 }
 157
 158 static void st21nfca_hci_i2c_disable(void *phy_id)
 159 {
 160         struct st21nfca_i2c_phy *phy = phy_id;
 161
 162         gpiod_set_value(phy->gpiod_ena, 0);
 163
 164         phy->powered = 0;
 165 }
 166
 167 static void st21nfca_hci_add_len_crc(struct sk_buff *skb)
 168 {
 169         u16 crc;
 170         u8 tmp;
 171
 172         *(u8 *)skb_push(skb, 1) = 0;
 173
 174         crc = crc_ccitt(0xffff, skb->data, skb->len);
 175         crc = ~crc;
 176
 177         tmp = crc & 0x00ff;
 178         skb_put_u8(skb, tmp);
 179
 180         tmp = (crc >> 8) & 0x00ff;
 181         skb_put_u8(skb, tmp);
 182 }
 183
 184 static void st21nfca_hci_remove_len_crc(struct sk_buff *skb)
 185 {
 186         skb_pull(skb, ST21NFCA_FRAME_HEADROOM);
 187         skb_trim(skb, skb->len - ST21NFCA_FRAME_TAILROOM);
 188 }
 189
 190 /*
 191  * Writing a frame must not return the number of written bytes.
 192  * It must return either zero for success, or <0 for error.
 193  * In addition, it must not alter the skb
 194  */
 195 static int st21nfca_hci_i2c_write(void *phy_id, struct sk_buff *skb)
 196 {
 197         int r = -1, i, j;
 198         struct st21nfca_i2c_phy *phy = phy_id;
 199         struct i2c_client *client = phy->i2c_dev;
 200         u8 tmp[ST21NFCA_HCI_LLC_MAX_SIZE * 2];
 201
 202         I2C_DUMP_SKB("st21nfca_hci_i2c_write", skb);
 203
 204         if (phy->hard_fault != 0)
 205                 return phy->hard_fault;
 206
 207         /*
 208          * Compute CRC before byte stuffing computation on frame
 209          * Note st21nfca_hci_add_len_crc is doing a byte stuffing
 210          * on its own value
 211          */
 212         st21nfca_hci_add_len_crc(skb);
 213
 214         /* add ST21NFCA_SOF_EOF on tail */
 215         skb_put_u8(skb, ST21NFCA_SOF_EOF);
 216         /* add ST21NFCA_SOF_EOF on head */
 217         *(u8 *)skb_push(skb, 1) = ST21NFCA_SOF_EOF;
 218
 219         /*
 220          * Compute byte stuffing
 221          * if byte == ST21NFCA_SOF_EOF or ST21NFCA_ESCAPE_BYTE_STUFFING
 222          * insert ST21NFCA_ESCAPE_BYTE_STUFFING (escape byte)
 223          * xor byte with ST21NFCA_BYTE_STUFFING_MASK
 224          */
 225         tmp[0] = skb->data[0];
 226         for (i = 1, j = 1; i < skb->len - 1; i++, j++) {
 227                 if (skb->data[i] == ST21NFCA_SOF_EOF
 228                     || skb->data[i] == ST21NFCA_ESCAPE_BYTE_STUFFING) {
 229                         tmp[j] = ST21NFCA_ESCAPE_BYTE_STUFFING;
 230                         j++;
 231                         tmp[j] = skb->data[i] ^ ST21NFCA_BYTE_STUFFING_MASK;
 232                 } else {
 233                         tmp[j] = skb->data[i];
 234                 }
 235         }
 236         tmp[j] = skb->data[i];
 237         j++;
 238
 239         /*
 240          * Manage sleep mode
 241          * Try 3 times to send data with delay between each
 242          */
 243         mutex_lock(&phy->phy_lock);
 244         for (i = 0; i < ARRAY_SIZE(wait_tab) && r < 0; i++) {
 245                 r = i2c_master_send(client, tmp, j);
 246                 if (r < 0)
 247                         msleep(wait_tab[i]);
 248         }
 249         mutex_unlock(&phy->phy_lock);
 250
 251         if (r >= 0) {
 252                 if (r != j)
 253                         r = -EREMOTEIO;
 254                 else
 255                         r = 0;
 256         }
 257
 258         st21nfca_hci_remove_len_crc(skb);
 259
 260         return r;
 261 }
 262
 263 static int get_frame_size(u8 *buf, int buflen)
 264 {
 265         int len = 0;
 266
 267         if (buf[len + 1] == ST21NFCA_SOF_EOF)
 268                 return 0;
 269
 270         for (len = 1; len < buflen && buf[len] != ST21NFCA_SOF_EOF; len++)
 271                 ;
 272
 273         return len;
 274 }
 275
 276 static int check_crc(u8 *buf, int buflen)
 277 {
 278         u16 crc;
 279
 280         crc = crc_ccitt(0xffff, buf, buflen - 2);
 281         crc = ~crc;
 282
 283         if (buf[buflen - 2] != (crc & 0xff) || buf[buflen - 1] != (crc >> 8)) {
 284                 pr_err(ST21NFCA_HCI_DRIVER_NAME
 285                        ": CRC error 0x%x != 0x%x 0x%x\n", crc, buf[buflen - 1],
 286                        buf[buflen - 2]);
 287
 288                 pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__);
 289                 print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
 290                                16, 2, buf, buflen, false);
 291                 return -EPERM;
 292         }
 293         return 0;
 294 }
 295
 296 /*
 297  * Prepare received data for upper layer.
 298  * Received data include byte stuffing, crc and sof/eof
 299  * which is not usable by hci part.
 300  * returns:
 301  * frame size without sof/eof, header and byte stuffing
 302  * -EBADMSG : frame was incorrect and discarded
 303  */
 304 static int st21nfca_hci_i2c_repack(struct sk_buff *skb)
 305 {
 306         int i, j, r, size;
 307
 308         if (skb->len < 1 || (skb->len > 1 && skb->data[1] != 0))
 309                 return -EBADMSG;
 310
 311         size = get_frame_size(skb->data, skb->len);
 312         if (size > 0) {
 313                 skb_trim(skb, size);
 314                 /* remove ST21NFCA byte stuffing for upper layer */
 315                 for (i = 1, j = 0; i < skb->len; i++) {
 316                         if (skb->data[i + j] ==
 317                                         (u8) ST21NFCA_ESCAPE_BYTE_STUFFING) {
 318                                 skb->data[i] = skb->data[i + j + 1]
 319                                                 | ST21NFCA_BYTE_STUFFING_MASK;
 320                                 i++;
 321                                 j++;
 322                         }
 323                         skb->data[i] = skb->data[i + j];
 324                 }
 325                 /* remove byte stuffing useless byte */
 326                 skb_trim(skb, i - j);
 327                 /* remove ST21NFCA_SOF_EOF from head */
 328                 skb_pull(skb, 1);
 329
 330                 r = check_crc(skb->data, skb->len);
 331                 if (r != 0) {
 332                         i = 0;
 333                         return -EBADMSG;
 334                 }
 335
 336                 /* remove headbyte */
 337                 skb_pull(skb, 1);
 338                 /* remove crc. Byte Stuffing is already removed here */
 339                 skb_trim(skb, skb->len - 2);
 340                 return skb->len;
 341         }
 342         return 0;
 343 }
 344
 345 /*
 346  * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees
 347  * that i2c bus will be flushed and that next read will start on a new frame.
 348  * returned skb contains only LLC header and payload.
 349  * returns:
 350  * frame size : if received frame is complete (find ST21NFCA_SOF_EOF at
 351  * end of read)
 352  * -EAGAIN : if received frame is incomplete (not find ST21NFCA_SOF_EOF
 353  * at end of read)
 354  * -EREMOTEIO : i2c read error (fatal)
 355  * -EBADMSG : frame was incorrect and discarded
 356  * (value returned from st21nfca_hci_i2c_repack)
 357  * -EIO : if no ST21NFCA_SOF_EOF is found after reaching
 358  * the read length end sequence
 359  */
 360 static int st21nfca_hci_i2c_read(struct st21nfca_i2c_phy *phy,
 361                                  struct sk_buff *skb)
 362 {
 363         int r, i;
 364         u8 len;
 365         u8 buf[ST21NFCA_HCI_LLC_MAX_PAYLOAD];
 366         struct i2c_client *client = phy->i2c_dev;
 367
 368         if (phy->current_read_len < ARRAY_SIZE(len_seq)) {
 369                 len = len_seq[phy->current_read_len];
 370
 371                 /*
 372                  * Add retry mecanism
 373                  * Operation on I2C interface may fail in case of operation on
 374                  * RF or SWP interface
 375                  */
 376                 r = 0;
 377                 mutex_lock(&phy->phy_lock);
 378                 for (i = 0; i < ARRAY_SIZE(wait_tab) && r <= 0; i++) {
 379                         r = i2c_master_recv(client, buf, len);
 380                         if (r < 0)
 381                                 msleep(wait_tab[i]);
 382                 }
 383                 mutex_unlock(&phy->phy_lock);
 384
 385                 if (r != len) {
 386                         phy->current_read_len = 0;
 387                         return -EREMOTEIO;
 388                 }
 389
 390                 /*
 391                  * The first read sequence does not start with SOF.
 392                  * Data is corrupeted so we drop it.
 393                  */
 394                 if (!phy->current_read_len && !IS_START_OF_FRAME(buf)) {
 395                         skb_trim(skb, 0);
 396                         phy->current_read_len = 0;
 397                         return -EIO;
 398                 } else if (phy->current_read_len && IS_START_OF_FRAME(buf)) {
 399                         /*
 400                          * Previous frame transmission was interrupted and
 401                          * the frame got repeated.
 402                          * Received frame start with ST21NFCA_SOF_EOF + 00.
 403                          */
 404                         skb_trim(skb, 0);
 405                         phy->current_read_len = 0;
 406                 }
 407
 408                 skb_put_data(skb, buf, len);
 409
 410                 if (skb->data[skb->len - 1] == ST21NFCA_SOF_EOF) {
 411                         phy->current_read_len = 0;
 412                         return st21nfca_hci_i2c_repack(skb);
 413                 }
 414                 phy->current_read_len++;
 415                 return -EAGAIN;
 416         }
 417         return -EIO;
 418 }
 419
 420 /*
 421  * Reads an shdlc frame from the chip. This is not as straightforward as it
 422  * seems. The frame format is data-crc, and corruption can occur anywhere
 423  * while transiting on i2c bus, such that we could read an invalid data.
 424  * The tricky case is when we read a corrupted data or crc. We must detect
 425  * this here in order to determine that data can be transmitted to the hci
 426  * core. This is the reason why we check the crc here.
 427  * The CLF will repeat a frame until we send a RR on that frame.
 428  *
 429  * On ST21NFCA, IRQ goes in idle when read starts. As no size information are
 430  * available in the incoming data, other IRQ might come. Every IRQ will trigger
 431  * a read sequence with different length and will fill the current frame.
 432  * The reception is complete once we reach a ST21NFCA_SOF_EOF.
 433  */
 434 static irqreturn_t st21nfca_hci_irq_thread_fn(int irq, void *phy_id)
 435 {
 436         struct st21nfca_i2c_phy *phy = phy_id;
 437         struct i2c_client *client;
 438
 439         int r;
 440
 441         if (!phy || irq != phy->i2c_dev->irq) {
 442                 WARN_ON_ONCE(1);
 443                 return IRQ_NONE;
 444         }
 445
 446         client = phy->i2c_dev;
 447         dev_dbg(&client->dev, "IRQ\n");
 448
 449         if (phy->hard_fault != 0)
 450                 return IRQ_HANDLED;
 451
 452         r = st21nfca_hci_i2c_read(phy, phy->pending_skb);
 453         if (r == -EREMOTEIO) {
 454                 phy->hard_fault = r;
 455
 456                 nfc_hci_recv_frame(phy->hdev, NULL);
 457
 458                 return IRQ_HANDLED;
 459         } else if (r == -EAGAIN || r == -EIO) {
 460                 return IRQ_HANDLED;
 461         } else if (r == -EBADMSG && phy->crc_trials < ARRAY_SIZE(wait_tab)) {
 462                 /*
 463                  * With ST21NFCA, only one interface (I2C, RF or SWP)
 464                  * may be active at a time.
 465                  * Having incorrect crc is usually due to i2c macrocell
 466                  * deactivation in the middle of a transmission.
 467                  * It may generate corrupted data on i2c.
 468                  * We give sometime to get i2c back.
 469                  * The complete frame will be repeated.
 470                  */
 471                 msleep(wait_tab[phy->crc_trials]);
 472                 phy->crc_trials++;
 473                 phy->current_read_len = 0;
 474                 kfree_skb(phy->pending_skb);
 475         } else if (r > 0) {
 476                 /*
 477                  * We succeeded to read data from the CLF and
 478                  * data is valid.
 479                  * Reset counter.
 480                  */
 481                 nfc_hci_recv_frame(phy->hdev, phy->pending_skb);
 482                 phy->crc_trials = 0;
 483         } else {
 484                 kfree_skb(phy->pending_skb);
 485         }
 486
 487         phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL);
 488         if (phy->pending_skb == NULL) {
 489                 phy->hard_fault = -ENOMEM;
 490                 nfc_hci_recv_frame(phy->hdev, NULL);
 491         }
 492
 493         return IRQ_HANDLED;
 494 }
 495
 496 static struct nfc_phy_ops i2c_phy_ops = {
 497         .write = st21nfca_hci_i2c_write,
 498         .enable = st21nfca_hci_i2c_enable,
 499         .disable = st21nfca_hci_i2c_disable,
 500 };
 501
 502 static const struct acpi_gpio_params enable_gpios = { 1, 0, false };
 503
 504 static const struct acpi_gpio_mapping acpi_st21nfca_gpios[] = {
 505         { "enable-gpios", &enable_gpios, 1 },
 506         {},
 507 };
 508
 509 static int st21nfca_hci_i2c_probe(struct i2c_client *client,
 510                                   const struct i2c_device_id *id)
 511 {
 512         struct device *dev = &client->dev;
 513         struct st21nfca_i2c_phy *phy;
 514         int r;
 515
 516         dev_dbg(&client->dev, "%s\n", __func__);
 517         dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
 518
 519         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 520                 nfc_err(&client->dev, "Need I2C_FUNC_I2C\n");
 521                 return -ENODEV;
 522         }
 523
 524         phy = devm_kzalloc(&client->dev, sizeof(struct st21nfca_i2c_phy),
 525                            GFP_KERNEL);
 526         if (!phy)
 527                 return -ENOMEM;
 528
 529         phy->i2c_dev = client;
 530         phy->pending_skb = alloc_skb(ST21NFCA_HCI_LLC_MAX_SIZE * 2, GFP_KERNEL);
 531         if (phy->pending_skb == NULL)
 532                 return -ENOMEM;
 533
 534         phy->current_read_len = 0;
 535         phy->crc_trials = 0;
 536         mutex_init(&phy->phy_lock);
 537         i2c_set_clientdata(client, phy);
 538
 539         r = devm_acpi_dev_add_driver_gpios(dev, acpi_st21nfca_gpios);
 540         if (r)
 541                 dev_dbg(dev, "Unable to add GPIO mapping table\n");
 542
 543         /* Get EN GPIO from resource provider */
 544         phy->gpiod_ena = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
 545         if (IS_ERR(phy->gpiod_ena)) {
 546                 nfc_err(dev, "Unable to get ENABLE GPIO\n");
 547                 return PTR_ERR(phy->gpiod_ena);
 548         }
 549
 550         phy->se_status.is_ese_present =
 551                         device_property_read_bool(&client->dev, "ese-present");
 552         phy->se_status.is_uicc_present =
 553                         device_property_read_bool(&client->dev, "uicc-present");
 554
 555         r = st21nfca_hci_platform_init(phy);
 556         if (r < 0) {
 557                 nfc_err(&client->dev, "Unable to reboot st21nfca\n");
 558                 return r;
 559         }
 560
 561         r = devm_request_threaded_irq(&client->dev, client->irq, NULL,
 562                                 st21nfca_hci_irq_thread_fn,
 563                                 IRQF_ONESHOT,
 564                                 ST21NFCA_HCI_DRIVER_NAME, phy);
 565         if (r < 0) {
 566                 nfc_err(&client->dev, "Unable to register IRQ handler\n");
 567                 return r;
 568         }
 569
 570         return st21nfca_hci_probe(phy, &i2c_phy_ops, LLC_SHDLC_NAME,
 571                                         ST21NFCA_FRAME_HEADROOM,
 572                                         ST21NFCA_FRAME_TAILROOM,
 573                                         ST21NFCA_HCI_LLC_MAX_PAYLOAD,
 574                                         &phy->hdev,
 575                                         &phy->se_status);
 576 }
 577
 578 static int st21nfca_hci_i2c_remove(struct i2c_client *client)
 579 {
 580         struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
 581
 582         dev_dbg(&client->dev, "%s\n", __func__);
 583
 584         st21nfca_hci_remove(phy->hdev);
 585
 586         if (phy->powered)
 587                 st21nfca_hci_i2c_disable(phy);
 588
 589         return 0;
 590 }
 591
 592 static struct i2c_device_id st21nfca_hci_i2c_id_table[] = {
 593         {ST21NFCA_HCI_DRIVER_NAME, 0},
 594         {}
 595 };
 596 MODULE_DEVICE_TABLE(i2c, st21nfca_hci_i2c_id_table);
 597
 598 static const struct acpi_device_id st21nfca_hci_i2c_acpi_match[] = {
 599         {"SMO2100", 0},
 600         {}
 601 };
 602 MODULE_DEVICE_TABLE(acpi, st21nfca_hci_i2c_acpi_match);
 603
 604 static const struct of_device_id of_st21nfca_i2c_match[] = {
 605         { .compatible = "st,st21nfca-i2c", },
 606         { .compatible = "st,st21nfca_i2c", },
 607         {}
 608 };
 609 MODULE_DEVICE_TABLE(of, of_st21nfca_i2c_match);
 610
 611 static struct i2c_driver st21nfca_hci_i2c_driver = {
 612         .driver = {
 613                 .name = ST21NFCA_HCI_I2C_DRIVER_NAME,
 614                 .of_match_table = of_match_ptr(of_st21nfca_i2c_match),
 615                 .acpi_match_table = ACPI_PTR(st21nfca_hci_i2c_acpi_match),
 616         },
 617         .probe = st21nfca_hci_i2c_probe,
 618         .id_table = st21nfca_hci_i2c_id_table,
 619         .remove = st21nfca_hci_i2c_remove,
 620 };
 621 module_i2c_driver(st21nfca_hci_i2c_driver);
 622
 623 MODULE_LICENSE("GPL");
 624 MODULE_DESCRIPTION(DRIVER_DESC);