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/version.h> 22#include <linux/watchdog.h> 23 24#include <asm/unaligned.h> 25 26#define ZIIRAVE_TIMEOUT_MIN 3 27#define ZIIRAVE_TIMEOUT_MAX 255 28#define ZIIRAVE_TIMEOUT_DEFAULT 30 29 30#define ZIIRAVE_PING_VALUE 0x0 31 32#define ZIIRAVE_STATE_INITIAL 0x0 33#define ZIIRAVE_STATE_OFF 0x1 34#define ZIIRAVE_STATE_ON 0x2 35 36#define ZIIRAVE_FW_NAME "ziirave_wdt.fw" 37 38static char *ziirave_reasons[] = {"power cycle", "hw watchdog", NULL, NULL, 39 "host request", NULL, "illegal configuration", 40 "illegal instruction", "illegal trap", 41 "unknown"}; 42 43#define ZIIRAVE_WDT_FIRM_VER_MAJOR 0x1 44#define ZIIRAVE_WDT_BOOT_VER_MAJOR 0x3 45#define ZIIRAVE_WDT_RESET_REASON 0x5 46#define ZIIRAVE_WDT_STATE 0x6 47#define ZIIRAVE_WDT_TIMEOUT 0x7 48#define ZIIRAVE_WDT_TIME_LEFT 0x8 49#define ZIIRAVE_WDT_PING 0x9 50#define ZIIRAVE_WDT_RESET_DURATION 0xa 51 52#define ZIIRAVE_FIRM_PKT_TOTAL_SIZE 20 53#define ZIIRAVE_FIRM_PKT_DATA_SIZE 16 54#define ZIIRAVE_FIRM_FLASH_MEMORY_START (2 * 0x1600) 55#define ZIIRAVE_FIRM_FLASH_MEMORY_END (2 * 0x2bbf) 56#define ZIIRAVE_FIRM_PAGE_SIZE 128 57 58/* Received and ready for next Download packet. */ 59#define ZIIRAVE_FIRM_DOWNLOAD_ACK 1 60 61/* Firmware commands */ 62#define ZIIRAVE_CMD_DOWNLOAD_START 0x10 63#define ZIIRAVE_CMD_DOWNLOAD_END 0x11 64#define ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR 0x12 65#define ZIIRAVE_CMD_DOWNLOAD_READ_BYTE 0x13 66#define ZIIRAVE_CMD_RESET_PROCESSOR 0x0b 67#define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER 0x0c 68#define ZIIRAVE_CMD_DOWNLOAD_PACKET 0x0e 69 70#define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC 1 71#define ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC 1 72 73#define ZIIRAVE_FW_VERSION_FMT "02.%02u.%02u" 74#define ZIIRAVE_BL_VERSION_FMT "01.%02u.%02u" 75 76struct ziirave_wdt_rev { 77 unsigned char major; 78 unsigned char minor; 79}; 80 81struct ziirave_wdt_data { 82 struct mutex sysfs_mutex; 83 struct watchdog_device wdd; 84 struct ziirave_wdt_rev bootloader_rev; 85 struct ziirave_wdt_rev firmware_rev; 86 int reset_reason; 87}; 88 89static int wdt_timeout; 90module_param(wdt_timeout, int, 0); 91MODULE_PARM_DESC(wdt_timeout, "Watchdog timeout in seconds"); 92 93static int reset_duration; 94module_param(reset_duration, int, 0); 95MODULE_PARM_DESC(reset_duration, 96 "Watchdog reset pulse duration in milliseconds"); 97 98static bool nowayout = WATCHDOG_NOWAYOUT; 99module_param(nowayout, bool, 0); 100MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started default=" 101 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 102 103static int ziirave_wdt_revision(struct i2c_client *client, 104 struct ziirave_wdt_rev *rev, u8 command) 105{ 106 int ret; 107 108 ret = i2c_smbus_read_byte_data(client, command); 109 if (ret < 0) 110 return ret; 111 112 rev->major = ret; 113 114 ret = i2c_smbus_read_byte_data(client, command + 1); 115 if (ret < 0) 116 return ret; 117 118 rev->minor = ret; 119 120 return 0; 121} 122 123static int ziirave_wdt_set_state(struct watchdog_device *wdd, int state) 124{ 125 struct i2c_client *client = to_i2c_client(wdd->parent); 126 127 return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_STATE, state); 128} 129 130static int ziirave_wdt_start(struct watchdog_device *wdd) 131{ 132 return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_ON); 133} 134 135static int ziirave_wdt_stop(struct watchdog_device *wdd) 136{ 137 return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_OFF); 138} 139 140static int ziirave_wdt_ping(struct watchdog_device *wdd) 141{ 142 struct i2c_client *client = to_i2c_client(wdd->parent); 143 144 return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_PING, 145 ZIIRAVE_PING_VALUE); 146} 147 148static int ziirave_wdt_set_timeout(struct watchdog_device *wdd, 149 unsigned int timeout) 150{ 151 struct i2c_client *client = to_i2c_client(wdd->parent); 152 int ret; 153 154 ret = i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_TIMEOUT, timeout); 155 if (!ret) 156 wdd->timeout = timeout; 157 158 return ret; 159} 160 161static unsigned int ziirave_wdt_get_timeleft(struct watchdog_device *wdd) 162{ 163 struct i2c_client *client = to_i2c_client(wdd->parent); 164 int ret; 165 166 ret = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIME_LEFT); 167 if (ret < 0) 168 ret = 0; 169 170 return ret; 171} 172 173static int ziirave_firm_read_ack(struct watchdog_device *wdd) 174{ 175 struct i2c_client *client = to_i2c_client(wdd->parent); 176 int ret; 177 178 ret = i2c_smbus_read_byte(client); 179 if (ret < 0) { 180 dev_err(&client->dev, "Failed to read status byte\n"); 181 return ret; 182 } 183 184 return ret == ZIIRAVE_FIRM_DOWNLOAD_ACK ? 0 : -EIO; 185} 186 187static int ziirave_firm_set_read_addr(struct watchdog_device *wdd, u32 addr) 188{ 189 struct i2c_client *client = to_i2c_client(wdd->parent); 190 const u16 addr16 = (u16)addr / 2; 191 u8 address[2]; 192 193 put_unaligned_le16(addr16, address); 194 195 return i2c_smbus_write_block_data(client, 196 ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR, 197 sizeof(address), address); 198} 199 200static bool ziirave_firm_addr_readonly(u32 addr) 201{ 202 return addr < ZIIRAVE_FIRM_FLASH_MEMORY_START || 203 addr > ZIIRAVE_FIRM_FLASH_MEMORY_END; 204} 205 206/* 207 * ziirave_firm_write_pkt() - Build and write a firmware packet 208 * 209 * A packet to send to the firmware is composed by following bytes: 210 * Length | Addr0 | Addr1 | Data0 .. Data15 | Checksum | 211 * Where, 212 * Length: A data byte containing the length of the data. 213 * Addr0: Low byte of the address. 214 * Addr1: High byte of the address. 215 * Data0 .. Data15: Array of 16 bytes of data. 216 * Checksum: Checksum byte to verify data integrity. 217 */ 218static int __ziirave_firm_write_pkt(struct watchdog_device *wdd, 219 u32 addr, const u8 *data, u8 len) 220{ 221 const u16 addr16 = (u16)addr / 2; 222 struct i2c_client *client = to_i2c_client(wdd->parent); 223 u8 i, checksum = 0, packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE]; 224 int ret; 225 226 /* Check max data size */ 227 if (len > ZIIRAVE_FIRM_PKT_DATA_SIZE) { 228 dev_err(&client->dev, "Firmware packet too long (%d)\n", 229 len); 230 return -EMSGSIZE; 231 } 232 233 /* 234 * Ignore packets that are targeting program memory outisde of 235 * app partition, since they will be ignored by the 236 * bootloader. At the same time, we need to make sure we'll 237 * allow zero length packet that will be sent as the last step 238 * of firmware update 239 */ 240 if (len && ziirave_firm_addr_readonly(addr)) 241 return 0; 242 243 /* Packet length */ 244 packet[0] = len; 245 /* Packet address */ 246 put_unaligned_le16(addr16, packet + 1); 247 248 memcpy(packet + 3, data, len); 249 memset(packet + 3 + len, 0, ZIIRAVE_FIRM_PKT_DATA_SIZE - len); 250 251 /* Packet checksum */ 252 for (i = 0; i < len + 3; i++) 253 checksum += packet[i]; 254 packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1] = checksum; 255 256 ret = i2c_smbus_write_block_data(client, ZIIRAVE_CMD_DOWNLOAD_PACKET, 257 sizeof(packet), packet); 258 if (ret) { 259 dev_err(&client->dev, 260 "Failed to send DOWNLOAD_PACKET: %d\n", ret); 261 return ret; 262 } 263 264 ret = ziirave_firm_read_ack(wdd); 265 if (ret) 266 dev_err(&client->dev, 267 "Failed to write firmware packet at address 0x%04x: %d\n", 268 addr, ret); 269 270 return ret; 271} 272 273static int ziirave_firm_write_pkt(struct watchdog_device *wdd, 274 u32 addr, const u8 *data, u8 len) 275{ 276 const u8 max_write_len = ZIIRAVE_FIRM_PAGE_SIZE - 277 (addr - ALIGN_DOWN(addr, ZIIRAVE_FIRM_PAGE_SIZE)); 278 int ret; 279 280 if (len > max_write_len) { 281 /* 282 * If data crossed page boundary we need to split this 283 * write in two 284 */ 285 ret = __ziirave_firm_write_pkt(wdd, addr, data, max_write_len); 286 if (ret) 287 return ret; 288 289 addr += max_write_len; 290 data += max_write_len; 291 len -= max_write_len; 292 } 293 294 return __ziirave_firm_write_pkt(wdd, addr, data, len); 295} 296 297static int ziirave_firm_verify(struct watchdog_device *wdd, 298 const struct firmware *fw) 299{ 300 struct i2c_client *client = to_i2c_client(wdd->parent); 301 const struct ihex_binrec *rec; 302 int i, ret; 303 u8 data[ZIIRAVE_FIRM_PKT_DATA_SIZE]; 304 305 for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) { 306 const u16 len = be16_to_cpu(rec->len); 307 const u32 addr = be32_to_cpu(rec->addr); 308 309 if (ziirave_firm_addr_readonly(addr)) 310 continue; 311 312 ret = ziirave_firm_set_read_addr(wdd, addr); 313 if (ret) { 314 dev_err(&client->dev, 315 "Failed to send SET_READ_ADDR command: %d\n", 316 ret); 317 return ret; 318 } 319 320 for (i = 0; i < len; i++) { 321 ret = i2c_smbus_read_byte_data(client, 322 ZIIRAVE_CMD_DOWNLOAD_READ_BYTE); 323 if (ret < 0) { 324 dev_err(&client->dev, 325 "Failed to READ DATA: %d\n", ret); 326 return ret; 327 } 328 data[i] = ret; 329 } 330 331 if (memcmp(data, rec->data, len)) { 332 dev_err(&client->dev, 333 "Firmware mismatch at address 0x%04x\n", addr); 334 return -EINVAL; 335 } 336 } 337 338 return 0; 339} 340 341static int ziirave_firm_upload(struct watchdog_device *wdd, 342 const struct firmware *fw) 343{ 344 struct i2c_client *client = to_i2c_client(wdd->parent); 345 const struct ihex_binrec *rec; 346 int ret; 347 348 ret = i2c_smbus_write_byte_data(client, 349 ZIIRAVE_CMD_JUMP_TO_BOOTLOADER, 350 ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC); 351 if (ret) { 352 dev_err(&client->dev, "Failed to jump to bootloader\n"); 353 return ret; 354 } 355 356 msleep(500); 357 358 ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_START); 359 if (ret) { 360 dev_err(&client->dev, "Failed to start download\n"); 361 return ret; 362 } 363 364 ret = ziirave_firm_read_ack(wdd); 365 if (ret) { 366 dev_err(&client->dev, "No ACK for start download\n"); 367 return ret; 368 } 369 370 msleep(500); 371 372 for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) { 373 ret = ziirave_firm_write_pkt(wdd, be32_to_cpu(rec->addr), 374 rec->data, be16_to_cpu(rec->len)); 375 if (ret) 376 return ret; 377 } 378 379 /* 380 * Finish firmware download process by sending a zero length 381 * payload 382 */ 383 ret = ziirave_firm_write_pkt(wdd, 0, NULL, 0); 384 if (ret) { 385 dev_err(&client->dev, "Failed to send EMPTY packet: %d\n", ret); 386 return ret; 387 } 388 389 /* This sleep seems to be required */ 390 msleep(20); 391 392 /* Start firmware verification */ 393 ret = ziirave_firm_verify(wdd, fw); 394 if (ret) { 395 dev_err(&client->dev, 396 "Failed to verify firmware: %d\n", ret); 397 return ret; 398 } 399 400 /* End download operation */ 401 ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_END); 402 if (ret) { 403 dev_err(&client->dev, 404 "Failed to end firmware download: %d\n", ret); 405 return ret; 406 } 407 408 /* Reset the processor */ 409 ret = i2c_smbus_write_byte_data(client, 410 ZIIRAVE_CMD_RESET_PROCESSOR, 411 ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC); 412 if (ret) { 413 dev_err(&client->dev, 414 "Failed to reset the watchdog: %d\n", ret); 415 return ret; 416 } 417 418 msleep(500); 419 420 return 0; 421} 422 423static const struct watchdog_info ziirave_wdt_info = { 424 .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, 425 .identity = "RAVE Switch Watchdog", 426}; 427 428static const struct watchdog_ops ziirave_wdt_ops = { 429 .owner = THIS_MODULE, 430 .start = ziirave_wdt_start, 431 .stop = ziirave_wdt_stop, 432 .ping = ziirave_wdt_ping, 433 .set_timeout = ziirave_wdt_set_timeout, 434 .get_timeleft = ziirave_wdt_get_timeleft, 435}; 436 437static ssize_t ziirave_wdt_sysfs_show_firm(struct device *dev, 438 struct device_attribute *attr, 439 char *buf) 440{ 441 struct i2c_client *client = to_i2c_client(dev->parent); 442 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 443 int ret; 444 445 ret = mutex_lock_interruptible(&w_priv->sysfs_mutex); 446 if (ret) 447 return ret; 448 449 ret = sprintf(buf, ZIIRAVE_FW_VERSION_FMT, w_priv->firmware_rev.major, 450 w_priv->firmware_rev.minor); 451 452 mutex_unlock(&w_priv->sysfs_mutex); 453 454 return ret; 455} 456 457static DEVICE_ATTR(firmware_version, S_IRUGO, ziirave_wdt_sysfs_show_firm, 458 NULL); 459 460static ssize_t ziirave_wdt_sysfs_show_boot(struct device *dev, 461 struct device_attribute *attr, 462 char *buf) 463{ 464 struct i2c_client *client = to_i2c_client(dev->parent); 465 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 466 int ret; 467 468 ret = mutex_lock_interruptible(&w_priv->sysfs_mutex); 469 if (ret) 470 return ret; 471 472 ret = sprintf(buf, ZIIRAVE_BL_VERSION_FMT, w_priv->bootloader_rev.major, 473 w_priv->bootloader_rev.minor); 474 475 mutex_unlock(&w_priv->sysfs_mutex); 476 477 return ret; 478} 479 480static DEVICE_ATTR(bootloader_version, S_IRUGO, ziirave_wdt_sysfs_show_boot, 481 NULL); 482 483static ssize_t ziirave_wdt_sysfs_show_reason(struct device *dev, 484 struct device_attribute *attr, 485 char *buf) 486{ 487 struct i2c_client *client = to_i2c_client(dev->parent); 488 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 489 int ret; 490 491 ret = mutex_lock_interruptible(&w_priv->sysfs_mutex); 492 if (ret) 493 return ret; 494 495 ret = sprintf(buf, "%s", ziirave_reasons[w_priv->reset_reason]); 496 497 mutex_unlock(&w_priv->sysfs_mutex); 498 499 return ret; 500} 501 502static DEVICE_ATTR(reset_reason, S_IRUGO, ziirave_wdt_sysfs_show_reason, 503 NULL); 504 505static ssize_t ziirave_wdt_sysfs_store_firm(struct device *dev, 506 struct device_attribute *attr, 507 const char *buf, size_t count) 508{ 509 struct i2c_client *client = to_i2c_client(dev->parent); 510 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 511 const struct firmware *fw; 512 int err; 513 514 err = request_ihex_firmware(&fw, ZIIRAVE_FW_NAME, dev); 515 if (err) { 516 dev_err(&client->dev, "Failed to request ihex firmware\n"); 517 return err; 518 } 519 520 err = mutex_lock_interruptible(&w_priv->sysfs_mutex); 521 if (err) 522 goto release_firmware; 523 524 err = ziirave_firm_upload(&w_priv->wdd, fw); 525 if (err) { 526 dev_err(&client->dev, "The firmware update failed: %d\n", err); 527 goto unlock_mutex; 528 } 529 530 /* Update firmware version */ 531 err = ziirave_wdt_revision(client, &w_priv->firmware_rev, 532 ZIIRAVE_WDT_FIRM_VER_MAJOR); 533 if (err) { 534 dev_err(&client->dev, "Failed to read firmware version: %d\n", 535 err); 536 goto unlock_mutex; 537 } 538 539 dev_info(&client->dev, 540 "Firmware updated to version " ZIIRAVE_FW_VERSION_FMT "\n", 541 w_priv->firmware_rev.major, w_priv->firmware_rev.minor); 542 543 /* Restore the watchdog timeout */ 544 err = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout); 545 if (err) 546 dev_err(&client->dev, "Failed to set timeout: %d\n", err); 547 548unlock_mutex: 549 mutex_unlock(&w_priv->sysfs_mutex); 550 551release_firmware: 552 release_firmware(fw); 553 554 return err ? err : count; 555} 556 557static DEVICE_ATTR(update_firmware, S_IWUSR, NULL, 558 ziirave_wdt_sysfs_store_firm); 559 560static struct attribute *ziirave_wdt_attrs[] = { 561 &dev_attr_firmware_version.attr, 562 &dev_attr_bootloader_version.attr, 563 &dev_attr_reset_reason.attr, 564 &dev_attr_update_firmware.attr, 565 NULL 566}; 567ATTRIBUTE_GROUPS(ziirave_wdt); 568 569static int ziirave_wdt_init_duration(struct i2c_client *client) 570{ 571 int ret; 572 573 if (!reset_duration) { 574 /* See if the reset pulse duration is provided in an of_node */ 575 if (!client->dev.of_node) 576 ret = -ENODEV; 577 else 578 ret = of_property_read_u32(client->dev.of_node, 579 "reset-duration-ms", 580 &reset_duration); 581 if (ret) { 582 dev_info(&client->dev, 583 "No reset pulse duration specified, using default\n"); 584 return 0; 585 } 586 } 587 588 if (reset_duration < 1 || reset_duration > 255) 589 return -EINVAL; 590 591 dev_info(&client->dev, "Setting reset duration to %dms", 592 reset_duration); 593 594 return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_RESET_DURATION, 595 reset_duration); 596} 597 598static int ziirave_wdt_probe(struct i2c_client *client, 599 const struct i2c_device_id *id) 600{ 601 int ret; 602 struct ziirave_wdt_data *w_priv; 603 int val; 604 605 if (!i2c_check_functionality(client->adapter, 606 I2C_FUNC_SMBUS_BYTE | 607 I2C_FUNC_SMBUS_BYTE_DATA | 608 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)) 609 return -ENODEV; 610 611 w_priv = devm_kzalloc(&client->dev, sizeof(*w_priv), GFP_KERNEL); 612 if (!w_priv) 613 return -ENOMEM; 614 615 mutex_init(&w_priv->sysfs_mutex); 616 617 w_priv->wdd.info = &ziirave_wdt_info; 618 w_priv->wdd.ops = &ziirave_wdt_ops; 619 w_priv->wdd.min_timeout = ZIIRAVE_TIMEOUT_MIN; 620 w_priv->wdd.max_timeout = ZIIRAVE_TIMEOUT_MAX; 621 w_priv->wdd.parent = &client->dev; 622 w_priv->wdd.groups = ziirave_wdt_groups; 623 624 watchdog_init_timeout(&w_priv->wdd, wdt_timeout, &client->dev); 625 626 /* 627 * The default value set in the watchdog should be perfectly valid, so 628 * pass that in if we haven't provided one via the module parameter or 629 * of property. 630 */ 631 if (w_priv->wdd.timeout == 0) { 632 val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIMEOUT); 633 if (val < 0) { 634 dev_err(&client->dev, "Failed to read timeout\n"); 635 return val; 636 } 637 638 if (val > ZIIRAVE_TIMEOUT_MAX || 639 val < ZIIRAVE_TIMEOUT_MIN) 640 val = ZIIRAVE_TIMEOUT_DEFAULT; 641 642 w_priv->wdd.timeout = val; 643 } 644 645 ret = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout); 646 if (ret) { 647 dev_err(&client->dev, "Failed to set timeout\n"); 648 return ret; 649 } 650 651 dev_info(&client->dev, "Timeout set to %ds\n", w_priv->wdd.timeout); 652 653 watchdog_set_nowayout(&w_priv->wdd, nowayout); 654 655 i2c_set_clientdata(client, w_priv); 656 657 /* If in unconfigured state, set to stopped */ 658 val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_STATE); 659 if (val < 0) { 660 dev_err(&client->dev, "Failed to read state\n"); 661 return val; 662 } 663 664 if (val == ZIIRAVE_STATE_INITIAL) 665 ziirave_wdt_stop(&w_priv->wdd); 666 667 ret = ziirave_wdt_init_duration(client); 668 if (ret) { 669 dev_err(&client->dev, "Failed to init duration\n"); 670 return ret; 671 } 672 673 ret = ziirave_wdt_revision(client, &w_priv->firmware_rev, 674 ZIIRAVE_WDT_FIRM_VER_MAJOR); 675 if (ret) { 676 dev_err(&client->dev, "Failed to read firmware version\n"); 677 return ret; 678 } 679 680 dev_info(&client->dev, 681 "Firmware version: " ZIIRAVE_FW_VERSION_FMT "\n", 682 w_priv->firmware_rev.major, w_priv->firmware_rev.minor); 683 684 ret = ziirave_wdt_revision(client, &w_priv->bootloader_rev, 685 ZIIRAVE_WDT_BOOT_VER_MAJOR); 686 if (ret) { 687 dev_err(&client->dev, "Failed to read bootloader version\n"); 688 return ret; 689 } 690 691 dev_info(&client->dev, 692 "Bootloader version: " ZIIRAVE_BL_VERSION_FMT "\n", 693 w_priv->bootloader_rev.major, w_priv->bootloader_rev.minor); 694 695 w_priv->reset_reason = i2c_smbus_read_byte_data(client, 696 ZIIRAVE_WDT_RESET_REASON); 697 if (w_priv->reset_reason < 0) { 698 dev_err(&client->dev, "Failed to read reset reason\n"); 699 return w_priv->reset_reason; 700 } 701 702 if (w_priv->reset_reason >= ARRAY_SIZE(ziirave_reasons) || 703 !ziirave_reasons[w_priv->reset_reason]) { 704 dev_err(&client->dev, "Invalid reset reason\n"); 705 return -ENODEV; 706 } 707 708 ret = watchdog_register_device(&w_priv->wdd); 709 710 return ret; 711} 712 713static int ziirave_wdt_remove(struct i2c_client *client) 714{ 715 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client); 716 717 watchdog_unregister_device(&w_priv->wdd); 718 719 return 0; 720} 721 722static const struct i2c_device_id ziirave_wdt_id[] = { 723 { "rave-wdt", 0 }, 724 { } 725}; 726MODULE_DEVICE_TABLE(i2c, ziirave_wdt_id); 727 728static const struct of_device_id zrv_wdt_of_match[] = { 729 { .compatible = "zii,rave-wdt", }, 730 { }, 731}; 732MODULE_DEVICE_TABLE(of, zrv_wdt_of_match); 733 734static struct i2c_driver ziirave_wdt_driver = { 735 .driver = { 736 .name = "ziirave_wdt", 737 .of_match_table = zrv_wdt_of_match, 738 }, 739 .probe = ziirave_wdt_probe, 740 .remove = ziirave_wdt_remove, 741 .id_table = ziirave_wdt_id, 742}; 743 744module_i2c_driver(ziirave_wdt_driver); 745 746MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.co.uk"); 747MODULE_DESCRIPTION("Zodiac Aerospace RAVE Switch Watchdog Processor Driver"); 748MODULE_LICENSE("GPL"); 749