1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (C) 2015 Zodiac Inflight Innovations 4 * 5 * Author: Martyn Welch <martyn.welch@collabora.co.uk> 6 * 7 * Based on twl4030_wdt.c by Timo Kokkonen <timo.t.kokkonen at nokia.com>: 8 * 9 * Copyright (C) Nokia Corporation 10 */ 11 12#include <linux/delay.h> 13#include <linux/i2c.h> 14#include <linux/ihex.h> 15#include <linux/firmware.h> 16#include <linux/kernel.h> 17#include <linux/module.h> 18#include <linux/slab.h> 19#include <linux/sysfs.h> 20#include <linux/types.h> 21#include <linux/watchdog.h> 22 23#include <asm/unaligned.h> 24 25#define ZIIRAVE_TIMEOUT_MIN 3 26#define ZIIRAVE_TIMEOUT_MAX 255 27#define ZIIRAVE_TIMEOUT_DEFAULT 30 28 29#define ZIIRAVE_PING_VALUE 0x0 30 31#define ZIIRAVE_STATE_INITIAL 0x0 32#define ZIIRAVE_STATE_OFF 0x1 33#define ZIIRAVE_STATE_ON 0x2 34 35#define ZIIRAVE_FW_NAME "ziirave_wdt.fw" 36 37static char *ziirave_reasons[] = {"power cycle", "hw watchdog", NULL, NULL, 38 "host request", NULL, "illegal configuration", 39 "illegal instruction", "illegal trap", 40 "unknown"}; 41 42#define ZIIRAVE_WDT_FIRM_VER_MAJOR 0x1 43#define ZIIRAVE_WDT_BOOT_VER_MAJOR 0x3 44#define ZIIRAVE_WDT_RESET_REASON 0x5 45#define ZIIRAVE_WDT_STATE 0x6 46#define ZIIRAVE_WDT_TIMEOUT 0x7 47#define ZIIRAVE_WDT_TIME_LEFT 0x8 48#define ZIIRAVE_WDT_PING 0x9 49#define ZIIRAVE_WDT_RESET_DURATION 0xa 50 51#define ZIIRAVE_FIRM_PKT_TOTAL_SIZE 20 52#define ZIIRAVE_FIRM_PKT_DATA_SIZE 16 53#define ZIIRAVE_FIRM_FLASH_MEMORY_START (2 * 0x1600) 54#define ZIIRAVE_FIRM_FLASH_MEMORY_END (2 * 0x2bbf) 55#define ZIIRAVE_FIRM_PAGE_SIZE 128 56 57/* Received and ready for next Download packet. */ 58#define ZIIRAVE_FIRM_DOWNLOAD_ACK 1 59 60/* Firmware commands */ 61#define ZIIRAVE_CMD_DOWNLOAD_START 0x10 62#define ZIIRAVE_CMD_DOWNLOAD_END 0x11 63#define ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR 0x12 64#define ZIIRAVE_CMD_DOWNLOAD_READ_BYTE 0x13 65#define ZIIRAVE_CMD_RESET_PROCESSOR 0x0b 66#define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER 0x0c 67#define ZIIRAVE_CMD_DOWNLOAD_PACKET 0x0e 68 69#define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC 1 70#define ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC 1 71 72struct ziirave_wdt_rev { 73 unsigned char major; 74 unsigned char minor; 75}; 76 77struct ziirave_wdt_data { 78 struct mutex sysfs_mutex; 79 struct watchdog_device wdd; 80 struct ziirave_wdt_rev bootloader_rev; 81 struct ziirave_wdt_rev firmware_rev; 82 int reset_reason; 83}; 84 85static int wdt_timeout; 86module_param(wdt_timeout, int, 0); 87MODULE_PARM_DESC(wdt_timeout, "Watchdog timeout in seconds"); 88 89static int reset_duration; 90module_param(reset_duration, int, 0); 91MODULE_PARM_DESC(reset_duration, 92 "Watchdog reset pulse duration in milliseconds"); 93 94static bool nowayout = WATCHDOG_NOWAYOUT; 95module_param(nowayout, bool, 0); 96MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started default=" 97 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 98 99static int ziirave_wdt_revision(struct i2c_client *client, 100 struct ziirave_wdt_rev *rev, u8 command) 101{ 102 int ret; 103 104 ret = i2c_smbus_read_byte_data(client, command); 105 if (ret < 0) 106 return ret; 107 108 rev->major = ret; 109 110 ret = i2c_smbus_read_byte_data(client, command + 1); 111 if (ret < 0) 112 return ret; 113 114 rev->minor = ret; 115 116 return 0; 117} 118 119static int ziirave_wdt_set_state(struct watchdog_device *wdd, int state) 120{ 121 struct i2c_client *client = to_i2c_client(wdd->parent); 122 123 return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_STATE, state); 124} 125 126static int ziirave_wdt_start(struct watchdog_device *wdd) 127{ 128 return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_ON); 129} 130 131static int ziirave_wdt_stop(struct watchdog_device *wdd) 132{ 133 return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_OFF); 134} 135 136static int ziirave_wdt_ping(struct watchdog_device *wdd) 137{ 138 struct i2c_client *client = to_i2c_client(wdd->parent); 139 140 return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_PING, 141 ZIIRAVE_PING_VALUE); 142} 143 144static int ziirave_wdt_set_timeout(struct watchdog_device *wdd, 145 unsigned int timeout) 146{ 147 struct i2c_client *client = to_i2c_client(wdd->parent); 148 int ret; 149 150 ret = i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_TIMEOUT, timeout); 151 if (!ret) 152 wdd->timeout = timeout; 153 154 return ret; 155} 156 157static unsigned int ziirave_wdt_get_timeleft(struct watchdog_device *wdd) 158{ 159 struct i2c_client *client = to_i2c_client(wdd->parent); 160 int ret; 161 162 ret = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIME_LEFT); 163 if (ret < 0) 164 ret = 0; 165 166 return ret; 167} 168 169static int ziirave_firm_read_ack(struct watchdog_device *wdd) 170{ 171 struct i2c_client *client = to_i2c_client(wdd->parent); 172 int ret; 173 174 ret = i2c_smbus_read_byte(client); 175 if (ret < 0) { 176 dev_err(&client->dev, "Failed to read status byte\n"); 177 return ret; 178 } 179 180 return ret == ZIIRAVE_FIRM_DOWNLOAD_ACK ? 0 : -EIO; 181} 182 183static int ziirave_firm_set_read_addr(struct watchdog_device *wdd, u32 addr) 184{ 185 struct i2c_client *client = to_i2c_client(wdd->parent); 186 const u16 addr16 = (u16)addr / 2; 187 u8 address[2]; 188 189 put_unaligned_le16(addr16, address); 190 191 return i2c_smbus_write_block_data(client, 192 ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR, 193 sizeof(address), address); 194} 195 196static bool ziirave_firm_addr_readonly(u32 addr) 197{ 198 return addr < ZIIRAVE_FIRM_FLASH_MEMORY_START || 199 addr > ZIIRAVE_FIRM_FLASH_MEMORY_END; 200} 201 202/* 203 * ziirave_firm_write_pkt() - Build and write a firmware packet 204 * 205 * A packet to send to the firmware is composed by following bytes: 206 * Length | Addr0 | Addr1 | Data0 .. Data15 | Checksum | 207 * Where, 208 * Length: A data byte containing the length of the data. 209 * Addr0: Low byte of the address. 210 * Addr1: High byte of the address. 211 * Data0 .. Data15: Array of 16 bytes of data. 212 * Checksum: Checksum byte to verify data integrity. 213 */ 214static int __ziirave_firm_write_pkt(struct watchdog_device *wdd, 215 u32 addr, const u8 *data, u8 len) 216{ 217 const u16 addr16 = (u16)addr / 2; 218 struct i2c_client *client = to_i2c_client(wdd->parent); 219 u8 i, checksum = 0, packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE]; 220 int ret; 221 222 /* Check max data size */ 223 if (len > ZIIRAVE_FIRM_PKT_DATA_SIZE) { 224 dev_err(&client->dev, "Firmware packet too long (%d)\n", 225 len); 226 return -EMSGSIZE; 227 } 228 229 /* 230 * Ignore packets that are targeting program memory outisde of 231 * app partition, since they will be ignored by the 232 * bootloader. At the same time, we need to make sure we'll 233 * allow zero length packet that will be sent as the last step 234 * of firmware update 235 */ 236 if (len && ziirave_firm_addr_readonly(addr)) 237 return 0; 238 239 /* Packet length */ 240 packet[0] = len; 241 /* Packet address */ 242 put_unaligned_le16(addr16, packet + 1); 243 244 memcpy(packet + 3, data, len); 245 memset(packet + 3 + len, 0, ZIIRAVE_FIRM_PKT_DATA_SIZE - len); 246 247 /* Packet checksum */ 248 for (i = 0; i < len + 3; i++) 249 checksum += packet[i]; 250 packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1] = checksum; 251 252 ret = i2c_smbus_write_block_data(client, ZIIRAVE_CMD_DOWNLOAD_PACKET, 253 sizeof(packet), packet); 254 if (ret) { 255 dev_err(&client->dev, 256 "Failed to send DOWNLOAD_PACKET: %d\n", ret); 257 return ret; 258 } 259 260 ret = ziirave_firm_read_ack(wdd); 261 if (ret) 262 dev_err(&client->dev, 263 "Failed to write firmware packet at address 0x%04x: %d\n", 264 addr, ret); 265 266 return ret; 267} 268 269static int ziirave_firm_write_pkt(struct watchdog_device *wdd, 270 u32 addr, const u8 *data, u8 len) 271{ 272 const u8 max_write_len = ZIIRAVE_FIRM_PAGE_SIZE - 273 (addr - ALIGN_DOWN(addr, ZIIRAVE_FIRM_PAGE_SIZE)); 274 int ret; 275 276 if (len > max_write_len) { 277 /* 278 * If data crossed page boundary we need to split this 279 * write in two 280 */ 281 ret = __ziirave_firm_write_pkt(wdd, addr, data, max_write_len); 282 if (ret) 283 return ret; 284 285 addr += max_write_len; 286 data += max_write_len; 287 len -= max_write_len; 288 } 289 290 return __ziirave_firm_write_pkt(wdd, addr, data, len); 291} 292 293static int ziirave_firm_verify(struct watchdog_device *wdd, 294 const struct firmware *fw) 295{ 296 struct i2c_client *client = to_i2c_client(wdd->parent); 297 const struct ihex_binrec *rec; 298 int i, ret; 299 u8 data[ZIIRAVE_FIRM_PKT_DATA_SIZE]; 300 301 for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) { 302 const u16 len = be16_to_cpu(rec->len); 303 const u32 addr = be32_to_cpu(rec->addr); 304 305 if (ziirave_firm_addr_readonly(addr)) 306 continue; 307 308 ret = ziirave_firm_set_read_addr(wdd, addr); 309 if (ret) { 310 dev_err(&client->dev, 311 "Failed to send SET_READ_ADDR command: %d\n", 312 ret); 313 return ret; 314 } 315 316 for (i = 0; i < len; i++) { 317 ret = i2c_smbus_read_byte_data(client, 318 ZIIRAVE_CMD_DOWNLOAD_READ_BYTE); 319 if (ret < 0) { 320 dev_err(&client->dev, 321 "Failed to READ DATA: %d\n", ret); 322 return ret; 323 } 324 data[i] = ret; 325 } 326 327 if (memcmp(data, rec->data, len)) { 328 dev_err(&client->dev, 329 "Firmware mismatch at address 0x%04x\n", addr); 330 return -EINVAL; 331 } 332 } 333 334 return 0; 335} 336 337static int ziirave_firm_upload(struct watchdog_device *wdd, 338 const struct firmware *fw) 339{ 340 struct i2c_client *client = to_i2c_client(wdd->parent); 341 const struct ihex_binrec *rec; 342 int ret; 343 344 ret = i2c_smbus_write_byte_data(client, 345 ZIIRAVE_CMD_JUMP_TO_BOOTLOADER, 346 ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC); 347 if (ret) { 348 dev_err(&client->dev, "Failed to jump to bootloader\n"); 349 return ret; 350 } 351 352 msleep(500); 353 354 ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_START); 355 if (ret) { 356 dev_err(&client->dev, "Failed to start download\n"); 357 return ret; 358 } 359 360 ret = ziirave_firm_read_ack(wdd); 361 if (ret) { 362 dev_err(&client->dev, "No ACK for start download\n"); 363 return ret; 364 } 365 366 msleep(500); 367 368 for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) { 369 ret = ziirave_firm_write_pkt(wdd, be32_to_cpu(rec->addr), 370 rec->data, be16_to_cpu(rec->len)); 371 if (ret) 372 return ret; 373 } 374 375 /* 376 * Finish firmware download process by sending a zero length 377 * payload 378 */ 379 ret = ziirave_firm_write_pkt(wdd, 0, NULL, 0); 380 if (ret) { 381 dev_err(&client->dev, "Failed to send EMPTY packet: %d\n", ret); 382 return ret; 383 } 384 385 /* This sleep seems to be required */ 386 msleep(20); 387 388 /* Start firmware verification */ 389 ret = ziirave_firm_verify(wdd, fw); 390 if (ret) { 391 dev_err(&client->dev, 392 "Failed to verify firmware: %d\n", ret); 393 return ret; 394 } 395 396 /* End download operation */ 397 ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_END); 398 if (ret) { 399 dev_err(&client->dev, 400 "Failed to end firmware download: %d\n", ret); 401 return ret; 402 } 403 404 /* Reset the processor */ 405 ret = i2c_smbus_write_byte_data(client, 406 ZIIRAVE_CMD_RESET_PROCESSOR, 407 ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC); 408 if (ret) { 409 dev_err(&client->dev, 410 "Failed to reset the watchdog: %d\n", ret); 411 return ret; 412 } 413 414 msleep(500); 415 416 return 0; 417} 418 419static const struct watchdog_info ziirave_wdt_info = { 420 .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, 421 .identity = "RAVE Switch Watchdog", 422}; 423 424static const struct watchdog_ops ziirave_wdt_ops = { 425 .owner = THIS_MODULE, 426 .start = ziirave_wdt_start, 427 .stop = ziirave_wdt_stop, 428 .ping = ziirave_wdt_ping, 429 .set_timeout = ziirave_wdt_set_timeout, 430 .get_timeleft = ziirave_wdt_get_timeleft, 431}; 432 433static ssize_t ziirave_wdt_sysfs_show_firm(struct device *dev, 434 struct device_attribute *attr, 435 char *buf) 436{ 437 struct i2c_client *client = to_i2c_client(dev->parent); 438 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 439 int ret; 440 441 ret = mutex_lock_interruptible(&w_priv->sysfs_mutex); 442 if (ret) 443 return ret; 444 445 ret = sysfs_emit(buf, "02.%02u.%02u\n", 446 w_priv->firmware_rev.major, 447 w_priv->firmware_rev.minor); 448 449 mutex_unlock(&w_priv->sysfs_mutex); 450 451 return ret; 452} 453 454static DEVICE_ATTR(firmware_version, S_IRUGO, ziirave_wdt_sysfs_show_firm, 455 NULL); 456 457static ssize_t ziirave_wdt_sysfs_show_boot(struct device *dev, 458 struct device_attribute *attr, 459 char *buf) 460{ 461 struct i2c_client *client = to_i2c_client(dev->parent); 462 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 463 int ret; 464 465 ret = mutex_lock_interruptible(&w_priv->sysfs_mutex); 466 if (ret) 467 return ret; 468 469 ret = sysfs_emit(buf, "01.%02u.%02u\n", 470 w_priv->bootloader_rev.major, 471 w_priv->bootloader_rev.minor); 472 473 mutex_unlock(&w_priv->sysfs_mutex); 474 475 return ret; 476} 477 478static DEVICE_ATTR(bootloader_version, S_IRUGO, ziirave_wdt_sysfs_show_boot, 479 NULL); 480 481static ssize_t ziirave_wdt_sysfs_show_reason(struct device *dev, 482 struct device_attribute *attr, 483 char *buf) 484{ 485 struct i2c_client *client = to_i2c_client(dev->parent); 486 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 487 int ret; 488 489 ret = mutex_lock_interruptible(&w_priv->sysfs_mutex); 490 if (ret) 491 return ret; 492 493 ret = sysfs_emit(buf, "%s\n", ziirave_reasons[w_priv->reset_reason]); 494 495 mutex_unlock(&w_priv->sysfs_mutex); 496 497 return ret; 498} 499 500static DEVICE_ATTR(reset_reason, S_IRUGO, ziirave_wdt_sysfs_show_reason, 501 NULL); 502 503static ssize_t ziirave_wdt_sysfs_store_firm(struct device *dev, 504 struct device_attribute *attr, 505 const char *buf, size_t count) 506{ 507 struct i2c_client *client = to_i2c_client(dev->parent); 508 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 509 const struct firmware *fw; 510 int err; 511 512 err = request_ihex_firmware(&fw, ZIIRAVE_FW_NAME, dev); 513 if (err) { 514 dev_err(&client->dev, "Failed to request ihex firmware\n"); 515 return err; 516 } 517 518 err = mutex_lock_interruptible(&w_priv->sysfs_mutex); 519 if (err) 520 goto release_firmware; 521 522 err = ziirave_firm_upload(&w_priv->wdd, fw); 523 if (err) { 524 dev_err(&client->dev, "The firmware update failed: %d\n", err); 525 goto unlock_mutex; 526 } 527 528 /* Update firmware version */ 529 err = ziirave_wdt_revision(client, &w_priv->firmware_rev, 530 ZIIRAVE_WDT_FIRM_VER_MAJOR); 531 if (err) { 532 dev_err(&client->dev, "Failed to read firmware version: %d\n", 533 err); 534 goto unlock_mutex; 535 } 536 537 dev_info(&client->dev, 538 "Firmware updated to version 02.%02u.%02u\n", 539 w_priv->firmware_rev.major, w_priv->firmware_rev.minor); 540 541 /* Restore the watchdog timeout */ 542 err = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout); 543 if (err) 544 dev_err(&client->dev, "Failed to set timeout: %d\n", err); 545 546unlock_mutex: 547 mutex_unlock(&w_priv->sysfs_mutex); 548 549release_firmware: 550 release_firmware(fw); 551 552 return err ? err : count; 553} 554 555static DEVICE_ATTR(update_firmware, S_IWUSR, NULL, 556 ziirave_wdt_sysfs_store_firm); 557 558static struct attribute *ziirave_wdt_attrs[] = { 559 &dev_attr_firmware_version.attr, 560 &dev_attr_bootloader_version.attr, 561 &dev_attr_reset_reason.attr, 562 &dev_attr_update_firmware.attr, 563 NULL 564}; 565ATTRIBUTE_GROUPS(ziirave_wdt); 566 567static int ziirave_wdt_init_duration(struct i2c_client *client) 568{ 569 int ret; 570 571 if (!reset_duration) { 572 /* See if the reset pulse duration is provided in an of_node */ 573 if (!client->dev.of_node) 574 ret = -ENODEV; 575 else 576 ret = of_property_read_u32(client->dev.of_node, 577 "reset-duration-ms", 578 &reset_duration); 579 if (ret) { 580 dev_info(&client->dev, 581 "No reset pulse duration specified, using default\n"); 582 return 0; 583 } 584 } 585 586 if (reset_duration < 1 || reset_duration > 255) 587 return -EINVAL; 588 589 dev_info(&client->dev, "Setting reset duration to %dms", 590 reset_duration); 591 592 return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_RESET_DURATION, 593 reset_duration); 594} 595 596static int ziirave_wdt_probe(struct i2c_client *client) 597{ 598 int ret; 599 struct ziirave_wdt_data *w_priv; 600 int val; 601 602 if (!i2c_check_functionality(client->adapter, 603 I2C_FUNC_SMBUS_BYTE | 604 I2C_FUNC_SMBUS_BYTE_DATA | 605 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)) 606 return -ENODEV; 607 608 w_priv = devm_kzalloc(&client->dev, sizeof(*w_priv), GFP_KERNEL); 609 if (!w_priv) 610 return -ENOMEM; 611 612 mutex_init(&w_priv->sysfs_mutex); 613 614 w_priv->wdd.info = &ziirave_wdt_info; 615 w_priv->wdd.ops = &ziirave_wdt_ops; 616 w_priv->wdd.min_timeout = ZIIRAVE_TIMEOUT_MIN; 617 w_priv->wdd.max_timeout = ZIIRAVE_TIMEOUT_MAX; 618 w_priv->wdd.parent = &client->dev; 619 w_priv->wdd.groups = ziirave_wdt_groups; 620 621 watchdog_init_timeout(&w_priv->wdd, wdt_timeout, &client->dev); 622 623 /* 624 * The default value set in the watchdog should be perfectly valid, so 625 * pass that in if we haven't provided one via the module parameter or 626 * of property. 627 */ 628 if (w_priv->wdd.timeout == 0) { 629 val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIMEOUT); 630 if (val < 0) { 631 dev_err(&client->dev, "Failed to read timeout\n"); 632 return val; 633 } 634 635 if (val > ZIIRAVE_TIMEOUT_MAX || 636 val < ZIIRAVE_TIMEOUT_MIN) 637 val = ZIIRAVE_TIMEOUT_DEFAULT; 638 639 w_priv->wdd.timeout = val; 640 } 641 642 ret = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout); 643 if (ret) { 644 dev_err(&client->dev, "Failed to set timeout\n"); 645 return ret; 646 } 647 648 dev_info(&client->dev, "Timeout set to %ds\n", w_priv->wdd.timeout); 649 650 watchdog_set_nowayout(&w_priv->wdd, nowayout); 651 652 i2c_set_clientdata(client, w_priv); 653 654 /* If in unconfigured state, set to stopped */ 655 val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_STATE); 656 if (val < 0) { 657 dev_err(&client->dev, "Failed to read state\n"); 658 return val; 659 } 660 661 if (val == ZIIRAVE_STATE_INITIAL) 662 ziirave_wdt_stop(&w_priv->wdd); 663 664 ret = ziirave_wdt_init_duration(client); 665 if (ret) { 666 dev_err(&client->dev, "Failed to init duration\n"); 667 return ret; 668 } 669 670 ret = ziirave_wdt_revision(client, &w_priv->firmware_rev, 671 ZIIRAVE_WDT_FIRM_VER_MAJOR); 672 if (ret) { 673 dev_err(&client->dev, "Failed to read firmware version\n"); 674 return ret; 675 } 676 677 dev_info(&client->dev, 678 "Firmware version: 02.%02u.%02u\n", 679 w_priv->firmware_rev.major, w_priv->firmware_rev.minor); 680 681 ret = ziirave_wdt_revision(client, &w_priv->bootloader_rev, 682 ZIIRAVE_WDT_BOOT_VER_MAJOR); 683 if (ret) { 684 dev_err(&client->dev, "Failed to read bootloader version\n"); 685 return ret; 686 } 687 688 dev_info(&client->dev, 689 "Bootloader version: 01.%02u.%02u\n", 690 w_priv->bootloader_rev.major, w_priv->bootloader_rev.minor); 691 692 w_priv->reset_reason = i2c_smbus_read_byte_data(client, 693 ZIIRAVE_WDT_RESET_REASON); 694 if (w_priv->reset_reason < 0) { 695 dev_err(&client->dev, "Failed to read reset reason\n"); 696 return w_priv->reset_reason; 697 } 698 699 if (w_priv->reset_reason >= ARRAY_SIZE(ziirave_reasons) || 700 !ziirave_reasons[w_priv->reset_reason]) { 701 dev_err(&client->dev, "Invalid reset reason\n"); 702 return -ENODEV; 703 } 704 705 ret = watchdog_register_device(&w_priv->wdd); 706 707 return ret; 708} 709 710static void ziirave_wdt_remove(struct i2c_client *client) 711{ 712 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 713 714 watchdog_unregister_device(&w_priv->wdd); 715} 716 717static const struct i2c_device_id ziirave_wdt_id[] = { 718 { "rave-wdt", 0 }, 719 { } 720}; 721MODULE_DEVICE_TABLE(i2c, ziirave_wdt_id); 722 723static const struct of_device_id zrv_wdt_of_match[] = { 724 { .compatible = "zii,rave-wdt", }, 725 { }, 726}; 727MODULE_DEVICE_TABLE(of, zrv_wdt_of_match); 728 729static struct i2c_driver ziirave_wdt_driver = { 730 .driver = { 731 .name = "ziirave_wdt", 732 .of_match_table = zrv_wdt_of_match, 733 }, 734 .probe = ziirave_wdt_probe, 735 .remove = ziirave_wdt_remove, 736 .id_table = ziirave_wdt_id, 737}; 738 739module_i2c_driver(ziirave_wdt_driver); 740 741MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.co.uk"); 742MODULE_DESCRIPTION("Zodiac Aerospace RAVE Switch Watchdog Processor Driver"); 743MODULE_LICENSE("GPL"); 744