This source file includes following definitions.
- ziirave_wdt_revision
- ziirave_wdt_set_state
- ziirave_wdt_start
- ziirave_wdt_stop
- ziirave_wdt_ping
- ziirave_wdt_set_timeout
- ziirave_wdt_get_timeleft
- ziirave_firm_read_ack
- ziirave_firm_set_read_addr
- ziirave_firm_addr_readonly
- __ziirave_firm_write_pkt
- ziirave_firm_write_pkt
- ziirave_firm_verify
- ziirave_firm_upload
- ziirave_wdt_sysfs_show_firm
- ziirave_wdt_sysfs_show_boot
- ziirave_wdt_sysfs_show_reason
- ziirave_wdt_sysfs_store_firm
- ziirave_wdt_init_duration
- ziirave_wdt_probe
- ziirave_wdt_remove
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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
38 static 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
59 #define ZIIRAVE_FIRM_DOWNLOAD_ACK 1
60
61
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
76 struct ziirave_wdt_rev {
77 unsigned char major;
78 unsigned char minor;
79 };
80
81 struct 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
89 static int wdt_timeout;
90 module_param(wdt_timeout, int, 0);
91 MODULE_PARM_DESC(wdt_timeout, "Watchdog timeout in seconds");
92
93 static int reset_duration;
94 module_param(reset_duration, int, 0);
95 MODULE_PARM_DESC(reset_duration,
96 "Watchdog reset pulse duration in milliseconds");
97
98 static bool nowayout = WATCHDOG_NOWAYOUT;
99 module_param(nowayout, bool, 0);
100 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started default="
101 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
102
103 static 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
123 static 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
130 static int ziirave_wdt_start(struct watchdog_device *wdd)
131 {
132 return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_ON);
133 }
134
135 static int ziirave_wdt_stop(struct watchdog_device *wdd)
136 {
137 return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_OFF);
138 }
139
140 static 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
148 static 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
161 static 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
173 static 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
187 static 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
200 static 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
208
209
210
211
212
213
214
215
216
217
218 static 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
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
235
236
237
238
239
240 if (len && ziirave_firm_addr_readonly(addr))
241 return 0;
242
243
244 packet[0] = len;
245
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
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
273 static 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
283
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
297 static 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
341 static 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
381
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
390 msleep(20);
391
392
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
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
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
423 static const struct watchdog_info ziirave_wdt_info = {
424 .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
425 .identity = "Zodiac RAVE Watchdog",
426 };
427
428 static 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
437 static 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
457 static DEVICE_ATTR(firmware_version, S_IRUGO, ziirave_wdt_sysfs_show_firm,
458 NULL);
459
460 static 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
480 static DEVICE_ATTR(bootloader_version, S_IRUGO, ziirave_wdt_sysfs_show_boot,
481 NULL);
482
483 static 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
502 static DEVICE_ATTR(reset_reason, S_IRUGO, ziirave_wdt_sysfs_show_reason,
503 NULL);
504
505 static 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
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
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
548 unlock_mutex:
549 mutex_unlock(&w_priv->sysfs_mutex);
550
551 release_firmware:
552 release_firmware(fw);
553
554 return err ? err : count;
555 }
556
557 static DEVICE_ATTR(update_firmware, S_IWUSR, NULL,
558 ziirave_wdt_sysfs_store_firm);
559
560 static 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 };
567 ATTRIBUTE_GROUPS(ziirave_wdt);
568
569 static int ziirave_wdt_init_duration(struct i2c_client *client)
570 {
571 int ret;
572
573 if (!reset_duration) {
574
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
598 static 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
628
629
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
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
713 static 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
722 static const struct i2c_device_id ziirave_wdt_id[] = {
723 { "rave-wdt", 0 },
724 { }
725 };
726 MODULE_DEVICE_TABLE(i2c, ziirave_wdt_id);
727
728 static const struct of_device_id zrv_wdt_of_match[] = {
729 { .compatible = "zii,rave-wdt", },
730 { },
731 };
732 MODULE_DEVICE_TABLE(of, zrv_wdt_of_match);
733
734 static 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
744 module_i2c_driver(ziirave_wdt_driver);
745
746 MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.co.uk");
747 MODULE_DESCRIPTION("Zodiac Aerospace RAVE Switch Watchdog Processor Driver");
748 MODULE_LICENSE("GPL");