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 63static struct i2c_device_id st21nfca_hci_i2c_id_table[] = { 64 {ST21NFCA_HCI_DRIVER_NAME, 0}, 65 {} 66}; 67 68MODULE_DEVICE_TABLE(i2c, st21nfca_hci_i2c_id_table); 69 70struct 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}; 97static u8 len_seq[] = { 16, 24, 12, 29 }; 98static u16 wait_tab[] = { 2, 3, 5, 15, 20, 40}; 99 100#define I2C_DUMP_SKB(info, skb) \ 101do { \ 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 */ 113static 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 152static 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 165static 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 175static 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 192static 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 */ 203static 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 272static 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 285static 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 */ 313static 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 */ 369static 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 */ 443static 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 505static 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 512static 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 550static int st21nfca_hci_i2c_of_request_resources(struct i2c_client *client) 551{ 552 return -ENODEV; 553} 554#endif 555 556static 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 587static 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 658static 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 673static const struct of_device_id of_st21nfca_i2c_match[] = { 674 { .compatible = "st,st21nfca-i2c", }, 675 { .compatible = "st,st21nfca_i2c", }, 676 {} 677}; 678MODULE_DEVICE_TABLE(of, of_st21nfca_i2c_match); 679#endif 680 681static 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 692module_i2c_driver(st21nfca_hci_i2c_driver); 693 694MODULE_LICENSE("GPL"); 695MODULE_DESCRIPTION(DRIVER_DESC); 696