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