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1/*
2 * Copyright (C) 2015 Zodiac Inflight Innovations
3 *
4 * Author: Martyn Welch <martyn.welch@collabora.co.uk>
5 *
6 * Based on twl4030_wdt.c by Timo Kokkonen <timo.t.kokkonen at nokia.com>:
7 *
8 * Copyright (C) Nokia Corporation
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 */
20
21#include <linux/delay.h>
22#include <linux/i2c.h>
23#include <linux/ihex.h>
24#include <linux/firmware.h>
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/sysfs.h>
29#include <linux/types.h>
30#include <linux/version.h>
31#include <linux/watchdog.h>
32
33#define ZIIRAVE_TIMEOUT_MIN 3
34#define ZIIRAVE_TIMEOUT_MAX 255
35
36#define ZIIRAVE_PING_VALUE 0x0
37
38#define ZIIRAVE_STATE_INITIAL 0x0
39#define ZIIRAVE_STATE_OFF 0x1
40#define ZIIRAVE_STATE_ON 0x2
41
42#define ZIIRAVE_FW_NAME "ziirave_wdt.fw"
43
44static char *ziirave_reasons[] = {"power cycle", "hw watchdog", NULL, NULL,
45 "host request", NULL, "illegal configuration",
46 "illegal instruction", "illegal trap",
47 "unknown"};
48
49#define ZIIRAVE_WDT_FIRM_VER_MAJOR 0x1
50#define ZIIRAVE_WDT_BOOT_VER_MAJOR 0x3
51#define ZIIRAVE_WDT_RESET_REASON 0x5
52#define ZIIRAVE_WDT_STATE 0x6
53#define ZIIRAVE_WDT_TIMEOUT 0x7
54#define ZIIRAVE_WDT_TIME_LEFT 0x8
55#define ZIIRAVE_WDT_PING 0x9
56#define ZIIRAVE_WDT_RESET_DURATION 0xa
57
58#define ZIIRAVE_FIRM_PKT_TOTAL_SIZE 20
59#define ZIIRAVE_FIRM_PKT_DATA_SIZE 16
60#define ZIIRAVE_FIRM_FLASH_MEMORY_START 0x1600
61#define ZIIRAVE_FIRM_FLASH_MEMORY_END 0x2bbf
62
63/* Received and ready for next Download packet. */
64#define ZIIRAVE_FIRM_DOWNLOAD_ACK 1
65/* Currently writing to flash. Retry Download status in a moment! */
66#define ZIIRAVE_FIRM_DOWNLOAD_BUSY 2
67
68/* Wait for ACK timeout in ms */
69#define ZIIRAVE_FIRM_WAIT_FOR_ACK_TIMEOUT 50
70
71/* Firmware commands */
72#define ZIIRAVE_CMD_DOWNLOAD_START 0x10
73#define ZIIRAVE_CMD_DOWNLOAD_END 0x11
74#define ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR 0x12
75#define ZIIRAVE_CMD_DOWNLOAD_READ_BYTE 0x13
76#define ZIIRAVE_CMD_RESET_PROCESSOR 0x0b
77#define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER 0x0c
78#define ZIIRAVE_CMD_DOWNLOAD_PACKET 0x0e
79
80struct ziirave_wdt_rev {
81 unsigned char major;
82 unsigned char minor;
83};
84
85struct ziirave_wdt_data {
86 struct mutex sysfs_mutex;
87 struct watchdog_device wdd;
88 struct ziirave_wdt_rev bootloader_rev;
89 struct ziirave_wdt_rev firmware_rev;
90 int reset_reason;
91};
92
93static int wdt_timeout;
94module_param(wdt_timeout, int, 0);
95MODULE_PARM_DESC(wdt_timeout, "Watchdog timeout in seconds");
96
97static int reset_duration;
98module_param(reset_duration, int, 0);
99MODULE_PARM_DESC(reset_duration,
100 "Watchdog reset pulse duration in milliseconds");
101
102static bool nowayout = WATCHDOG_NOWAYOUT;
103module_param(nowayout, bool, 0);
104MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started default="
105 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
106
107static int ziirave_wdt_revision(struct i2c_client *client,
108 struct ziirave_wdt_rev *rev, u8 command)
109{
110 int ret;
111
112 ret = i2c_smbus_read_byte_data(client, command);
113 if (ret < 0)
114 return ret;
115
116 rev->major = ret;
117
118 ret = i2c_smbus_read_byte_data(client, command + 1);
119 if (ret < 0)
120 return ret;
121
122 rev->minor = ret;
123
124 return 0;
125}
126
127static int ziirave_wdt_set_state(struct watchdog_device *wdd, int state)
128{
129 struct i2c_client *client = to_i2c_client(wdd->parent);
130
131 return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_STATE, state);
132}
133
134static int ziirave_wdt_start(struct watchdog_device *wdd)
135{
136 return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_ON);
137}
138
139static int ziirave_wdt_stop(struct watchdog_device *wdd)
140{
141 return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_OFF);
142}
143
144static int ziirave_wdt_ping(struct watchdog_device *wdd)
145{
146 struct i2c_client *client = to_i2c_client(wdd->parent);
147
148 return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_PING,
149 ZIIRAVE_PING_VALUE);
150}
151
152static int ziirave_wdt_set_timeout(struct watchdog_device *wdd,
153 unsigned int timeout)
154{
155 struct i2c_client *client = to_i2c_client(wdd->parent);
156 int ret;
157
158 ret = i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_TIMEOUT, timeout);
159 if (!ret)
160 wdd->timeout = timeout;
161
162 return ret;
163}
164
165static unsigned int ziirave_wdt_get_timeleft(struct watchdog_device *wdd)
166{
167 struct i2c_client *client = to_i2c_client(wdd->parent);
168 int ret;
169
170 ret = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIME_LEFT);
171 if (ret < 0)
172 ret = 0;
173
174 return ret;
175}
176
177static int ziirave_firm_wait_for_ack(struct watchdog_device *wdd)
178{
179 struct i2c_client *client = to_i2c_client(wdd->parent);
180 int ret;
181 unsigned long timeout;
182
183 timeout = jiffies + msecs_to_jiffies(ZIIRAVE_FIRM_WAIT_FOR_ACK_TIMEOUT);
184 do {
185 if (time_after(jiffies, timeout))
186 return -ETIMEDOUT;
187
188 usleep_range(5000, 10000);
189
190 ret = i2c_smbus_read_byte(client);
191 if (ret < 0) {
192 dev_err(&client->dev, "Failed to read byte\n");
193 return ret;
194 }
195 } while (ret == ZIIRAVE_FIRM_DOWNLOAD_BUSY);
196
197 return ret == ZIIRAVE_FIRM_DOWNLOAD_ACK ? 0 : -EIO;
198}
199
200static int ziirave_firm_set_read_addr(struct watchdog_device *wdd, u16 addr)
201{
202 struct i2c_client *client = to_i2c_client(wdd->parent);
203 u8 address[2];
204
205 address[0] = addr & 0xff;
206 address[1] = (addr >> 8) & 0xff;
207
208 return i2c_smbus_write_block_data(client,
209 ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR,
210 ARRAY_SIZE(address), address);
211}
212
213static int ziirave_firm_write_block_data(struct watchdog_device *wdd,
214 u8 command, u8 length, const u8 *data,
215 bool wait_for_ack)
216{
217 struct i2c_client *client = to_i2c_client(wdd->parent);
218 int ret;
219
220 ret = i2c_smbus_write_block_data(client, command, length, data);
221 if (ret) {
222 dev_err(&client->dev,
223 "Failed to send command 0x%02x: %d\n", command, ret);
224 return ret;
225 }
226
227 if (wait_for_ack)
228 ret = ziirave_firm_wait_for_ack(wdd);
229
230 return ret;
231}
232
233static int ziirave_firm_write_byte(struct watchdog_device *wdd, u8 command,
234 u8 byte, bool wait_for_ack)
235{
236 return ziirave_firm_write_block_data(wdd, command, 1, &byte,
237 wait_for_ack);
238}
239
240/*
241 * ziirave_firm_write_pkt() - Build and write a firmware packet
242 *
243 * A packet to send to the firmware is composed by following bytes:
244 * Length | Addr0 | Addr1 | Data0 .. Data15 | Checksum |
245 * Where,
246 * Length: A data byte containing the length of the data.
247 * Addr0: Low byte of the address.
248 * Addr1: High byte of the address.
249 * Data0 .. Data15: Array of 16 bytes of data.
250 * Checksum: Checksum byte to verify data integrity.
251 */
252static int ziirave_firm_write_pkt(struct watchdog_device *wdd,
253 const struct ihex_binrec *rec)
254{
255 struct i2c_client *client = to_i2c_client(wdd->parent);
256 u8 i, checksum = 0, packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE];
257 int ret;
258 u16 addr;
259
260 memset(packet, 0, ARRAY_SIZE(packet));
261
262 /* Packet length */
263 packet[0] = (u8)be16_to_cpu(rec->len);
264 /* Packet address */
265 addr = (be32_to_cpu(rec->addr) & 0xffff) >> 1;
266 packet[1] = addr & 0xff;
267 packet[2] = (addr & 0xff00) >> 8;
268
269 /* Packet data */
270 if (be16_to_cpu(rec->len) > ZIIRAVE_FIRM_PKT_DATA_SIZE)
271 return -EMSGSIZE;
272 memcpy(packet + 3, rec->data, be16_to_cpu(rec->len));
273
274 /* Packet checksum */
275 for (i = 0; i < ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1; i++)
276 checksum += packet[i];
277 packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1] = checksum;
278
279 ret = ziirave_firm_write_block_data(wdd, ZIIRAVE_CMD_DOWNLOAD_PACKET,
280 ARRAY_SIZE(packet), packet, true);
281 if (ret)
282 dev_err(&client->dev,
283 "Failed to write firmware packet at address 0x%04x: %d\n",
284 addr, ret);
285
286 return ret;
287}
288
289static int ziirave_firm_verify(struct watchdog_device *wdd,
290 const struct firmware *fw)
291{
292 struct i2c_client *client = to_i2c_client(wdd->parent);
293 const struct ihex_binrec *rec;
294 int i, ret;
295 u8 data[ZIIRAVE_FIRM_PKT_DATA_SIZE];
296 u16 addr;
297
298 for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
299 /* Zero length marks end of records */
300 if (!be16_to_cpu(rec->len))
301 break;
302
303 addr = (be32_to_cpu(rec->addr) & 0xffff) >> 1;
304 if (addr < ZIIRAVE_FIRM_FLASH_MEMORY_START ||
305 addr > ZIIRAVE_FIRM_FLASH_MEMORY_END)
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 < ARRAY_SIZE(data); 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, be16_to_cpu(rec->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 int ret, words_till_page_break;
342 const struct ihex_binrec *rec;
343 struct ihex_binrec *rec_new;
344
345 ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_JUMP_TO_BOOTLOADER, 1,
346 false);
347 if (ret)
348 return ret;
349
350 msleep(500);
351
352 ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_DOWNLOAD_START, 1, true);
353 if (ret)
354 return ret;
355
356 msleep(500);
357
358 for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
359 /* Zero length marks end of records */
360 if (!be16_to_cpu(rec->len))
361 break;
362
363 /* Check max data size */
364 if (be16_to_cpu(rec->len) > ZIIRAVE_FIRM_PKT_DATA_SIZE) {
365 dev_err(&client->dev, "Firmware packet too long (%d)\n",
366 be16_to_cpu(rec->len));
367 return -EMSGSIZE;
368 }
369
370 /* Calculate words till page break */
371 words_till_page_break = (64 - ((be32_to_cpu(rec->addr) >> 1) &
372 0x3f));
373 if ((be16_to_cpu(rec->len) >> 1) > words_till_page_break) {
374 /*
375 * Data in passes page boundary, so we need to split in
376 * two blocks of data. Create a packet with the first
377 * block of data.
378 */
379 rec_new = kzalloc(sizeof(struct ihex_binrec) +
380 (words_till_page_break << 1),
381 GFP_KERNEL);
382 if (!rec_new)
383 return -ENOMEM;
384
385 rec_new->len = cpu_to_be16(words_till_page_break << 1);
386 rec_new->addr = rec->addr;
387 memcpy(rec_new->data, rec->data,
388 be16_to_cpu(rec_new->len));
389
390 ret = ziirave_firm_write_pkt(wdd, rec_new);
391 kfree(rec_new);
392 if (ret)
393 return ret;
394
395 /* Create a packet with the second block of data */
396 rec_new = kzalloc(sizeof(struct ihex_binrec) +
397 be16_to_cpu(rec->len) -
398 (words_till_page_break << 1),
399 GFP_KERNEL);
400 if (!rec_new)
401 return -ENOMEM;
402
403 /* Remaining bytes */
404 rec_new->len = rec->len -
405 cpu_to_be16(words_till_page_break << 1);
406
407 rec_new->addr = cpu_to_be32(be32_to_cpu(rec->addr) +
408 (words_till_page_break << 1));
409
410 memcpy(rec_new->data,
411 rec->data + (words_till_page_break << 1),
412 be16_to_cpu(rec_new->len));
413
414 ret = ziirave_firm_write_pkt(wdd, rec_new);
415 kfree(rec_new);
416 if (ret)
417 return ret;
418 } else {
419 ret = ziirave_firm_write_pkt(wdd, rec);
420 if (ret)
421 return ret;
422 }
423 }
424
425 /* For end of download, the length field will be set to 0 */
426 rec_new = kzalloc(sizeof(struct ihex_binrec) + 1, GFP_KERNEL);
427 if (!rec_new)
428 return -ENOMEM;
429
430 ret = ziirave_firm_write_pkt(wdd, rec_new);
431 kfree(rec_new);
432 if (ret) {
433 dev_err(&client->dev, "Failed to send EMPTY packet: %d\n", ret);
434 return ret;
435 }
436
437 /* This sleep seems to be required */
438 msleep(20);
439
440 /* Start firmware verification */
441 ret = ziirave_firm_verify(wdd, fw);
442 if (ret) {
443 dev_err(&client->dev,
444 "Failed to verify firmware: %d\n", ret);
445 return ret;
446 }
447
448 /* End download operation */
449 ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_DOWNLOAD_END, 1, false);
450 if (ret)
451 return ret;
452
453 /* Reset the processor */
454 ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_RESET_PROCESSOR, 1,
455 false);
456 if (ret)
457 return ret;
458
459 msleep(500);
460
461 return 0;
462}
463
464static const struct watchdog_info ziirave_wdt_info = {
465 .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
466 .identity = "Zodiac RAVE Watchdog",
467};
468
469static const struct watchdog_ops ziirave_wdt_ops = {
470 .owner = THIS_MODULE,
471 .start = ziirave_wdt_start,
472 .stop = ziirave_wdt_stop,
473 .ping = ziirave_wdt_ping,
474 .set_timeout = ziirave_wdt_set_timeout,
475 .get_timeleft = ziirave_wdt_get_timeleft,
476};
477
478static ssize_t ziirave_wdt_sysfs_show_firm(struct device *dev,
479 struct device_attribute *attr,
480 char *buf)
481{
482 struct i2c_client *client = to_i2c_client(dev->parent);
483 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
484 int ret;
485
486 ret = mutex_lock_interruptible(&w_priv->sysfs_mutex);
487 if (ret)
488 return ret;
489
490 ret = sprintf(buf, "02.%02u.%02u", w_priv->firmware_rev.major,
491 w_priv->firmware_rev.minor);
492
493 mutex_unlock(&w_priv->sysfs_mutex);
494
495 return ret;
496}
497
498static DEVICE_ATTR(firmware_version, S_IRUGO, ziirave_wdt_sysfs_show_firm,
499 NULL);
500
501static ssize_t ziirave_wdt_sysfs_show_boot(struct device *dev,
502 struct device_attribute *attr,
503 char *buf)
504{
505 struct i2c_client *client = to_i2c_client(dev->parent);
506 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
507 int ret;
508
509 ret = mutex_lock_interruptible(&w_priv->sysfs_mutex);
510 if (ret)
511 return ret;
512
513 ret = sprintf(buf, "01.%02u.%02u", w_priv->bootloader_rev.major,
514 w_priv->bootloader_rev.minor);
515
516 mutex_unlock(&w_priv->sysfs_mutex);
517
518 return ret;
519}
520
521static DEVICE_ATTR(bootloader_version, S_IRUGO, ziirave_wdt_sysfs_show_boot,
522 NULL);
523
524static ssize_t ziirave_wdt_sysfs_show_reason(struct device *dev,
525 struct device_attribute *attr,
526 char *buf)
527{
528 struct i2c_client *client = to_i2c_client(dev->parent);
529 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
530 int ret;
531
532 ret = mutex_lock_interruptible(&w_priv->sysfs_mutex);
533 if (ret)
534 return ret;
535
536 ret = sprintf(buf, "%s", ziirave_reasons[w_priv->reset_reason]);
537
538 mutex_unlock(&w_priv->sysfs_mutex);
539
540 return ret;
541}
542
543static DEVICE_ATTR(reset_reason, S_IRUGO, ziirave_wdt_sysfs_show_reason,
544 NULL);
545
546static ssize_t ziirave_wdt_sysfs_store_firm(struct device *dev,
547 struct device_attribute *attr,
548 const char *buf, size_t count)
549{
550 struct i2c_client *client = to_i2c_client(dev->parent);
551 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
552 const struct firmware *fw;
553 int err;
554
555 err = request_ihex_firmware(&fw, ZIIRAVE_FW_NAME, dev);
556 if (err) {
557 dev_err(&client->dev, "Failed to request ihex firmware\n");
558 return err;
559 }
560
561 err = mutex_lock_interruptible(&w_priv->sysfs_mutex);
562 if (err)
563 goto release_firmware;
564
565 err = ziirave_firm_upload(&w_priv->wdd, fw);
566 if (err) {
567 dev_err(&client->dev, "The firmware update failed: %d\n", err);
568 goto unlock_mutex;
569 }
570
571 /* Update firmware version */
572 err = ziirave_wdt_revision(client, &w_priv->firmware_rev,
573 ZIIRAVE_WDT_FIRM_VER_MAJOR);
574 if (err) {
575 dev_err(&client->dev, "Failed to read firmware version: %d\n",
576 err);
577 goto unlock_mutex;
578 }
579
580 dev_info(&client->dev, "Firmware updated to version 02.%02u.%02u\n",
581 w_priv->firmware_rev.major, w_priv->firmware_rev.minor);
582
583 /* Restore the watchdog timeout */
584 err = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout);
585 if (err)
586 dev_err(&client->dev, "Failed to set timeout: %d\n", err);
587
588unlock_mutex:
589 mutex_unlock(&w_priv->sysfs_mutex);
590
591release_firmware:
592 release_firmware(fw);
593
594 return err ? err : count;
595}
596
597static DEVICE_ATTR(update_firmware, S_IWUSR, NULL,
598 ziirave_wdt_sysfs_store_firm);
599
600static struct attribute *ziirave_wdt_attrs[] = {
601 &dev_attr_firmware_version.attr,
602 &dev_attr_bootloader_version.attr,
603 &dev_attr_reset_reason.attr,
604 &dev_attr_update_firmware.attr,
605 NULL
606};
607ATTRIBUTE_GROUPS(ziirave_wdt);
608
609static int ziirave_wdt_init_duration(struct i2c_client *client)
610{
611 int ret;
612
613 if (!reset_duration) {
614 /* See if the reset pulse duration is provided in an of_node */
615 if (!client->dev.of_node)
616 ret = -ENODEV;
617 else
618 ret = of_property_read_u32(client->dev.of_node,
619 "reset-duration-ms",
620 &reset_duration);
621 if (ret) {
622 dev_info(&client->dev,
623 "Unable to set reset pulse duration, using default\n");
624 return 0;
625 }
626 }
627
628 if (reset_duration < 1 || reset_duration > 255)
629 return -EINVAL;
630
631 dev_info(&client->dev, "Setting reset duration to %dms",
632 reset_duration);
633
634 return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_RESET_DURATION,
635 reset_duration);
636}
637
638static int ziirave_wdt_probe(struct i2c_client *client,
639 const struct i2c_device_id *id)
640{
641 int ret;
642 struct ziirave_wdt_data *w_priv;
643 int val;
644
645 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
646 return -ENODEV;
647
648 w_priv = devm_kzalloc(&client->dev, sizeof(*w_priv), GFP_KERNEL);
649 if (!w_priv)
650 return -ENOMEM;
651
652 mutex_init(&w_priv->sysfs_mutex);
653
654 w_priv->wdd.info = &ziirave_wdt_info;
655 w_priv->wdd.ops = &ziirave_wdt_ops;
656 w_priv->wdd.min_timeout = ZIIRAVE_TIMEOUT_MIN;
657 w_priv->wdd.max_timeout = ZIIRAVE_TIMEOUT_MAX;
658 w_priv->wdd.parent = &client->dev;
659 w_priv->wdd.groups = ziirave_wdt_groups;
660
661 ret = watchdog_init_timeout(&w_priv->wdd, wdt_timeout, &client->dev);
662 if (ret) {
663 dev_info(&client->dev,
664 "Unable to select timeout value, using default\n");
665 }
666
667 /*
668 * The default value set in the watchdog should be perfectly valid, so
669 * pass that in if we haven't provided one via the module parameter or
670 * of property.
671 */
672 if (w_priv->wdd.timeout == 0) {
673 val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIMEOUT);
674 if (val < 0)
675 return val;
676
677 if (val < ZIIRAVE_TIMEOUT_MIN)
678 return -ENODEV;
679
680 w_priv->wdd.timeout = val;
681 } else {
682 ret = ziirave_wdt_set_timeout(&w_priv->wdd,
683 w_priv->wdd.timeout);
684 if (ret)
685 return ret;
686
687 dev_info(&client->dev, "Timeout set to %ds.",
688 w_priv->wdd.timeout);
689 }
690
691 watchdog_set_nowayout(&w_priv->wdd, nowayout);
692
693 i2c_set_clientdata(client, w_priv);
694
695 /* If in unconfigured state, set to stopped */
696 val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_STATE);
697 if (val < 0)
698 return val;
699
700 if (val == ZIIRAVE_STATE_INITIAL)
701 ziirave_wdt_stop(&w_priv->wdd);
702
703 ret = ziirave_wdt_init_duration(client);
704 if (ret)
705 return ret;
706
707 ret = ziirave_wdt_revision(client, &w_priv->firmware_rev,
708 ZIIRAVE_WDT_FIRM_VER_MAJOR);
709 if (ret)
710 return ret;
711
712 ret = ziirave_wdt_revision(client, &w_priv->bootloader_rev,
713 ZIIRAVE_WDT_BOOT_VER_MAJOR);
714 if (ret)
715 return ret;
716
717 w_priv->reset_reason = i2c_smbus_read_byte_data(client,
718 ZIIRAVE_WDT_RESET_REASON);
719 if (w_priv->reset_reason < 0)
720 return w_priv->reset_reason;
721
722 if (w_priv->reset_reason >= ARRAY_SIZE(ziirave_reasons) ||
723 !ziirave_reasons[w_priv->reset_reason])
724 return -ENODEV;
725
726 ret = watchdog_register_device(&w_priv->wdd);
727
728 return ret;
729}
730
731static int ziirave_wdt_remove(struct i2c_client *client)
732{
733 struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
734
735 watchdog_unregister_device(&w_priv->wdd);
736
737 return 0;
738}
739
740static struct i2c_device_id ziirave_wdt_id[] = {
741 { "rave-wdt", 0 },
742 { }
743};
744MODULE_DEVICE_TABLE(i2c, ziirave_wdt_id);
745
746static const struct of_device_id zrv_wdt_of_match[] = {
747 { .compatible = "zii,rave-wdt", },
748 { },
749};
750MODULE_DEVICE_TABLE(of, zrv_wdt_of_match);
751
752static struct i2c_driver ziirave_wdt_driver = {
753 .driver = {
754 .name = "ziirave_wdt",
755 .of_match_table = zrv_wdt_of_match,
756 },
757 .probe = ziirave_wdt_probe,
758 .remove = ziirave_wdt_remove,
759 .id_table = ziirave_wdt_id,
760};
761
762module_i2c_driver(ziirave_wdt_driver);
763
764MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.co.uk");
765MODULE_DESCRIPTION("Zodiac Aerospace RAVE Switch Watchdog Processor Driver");
766MODULE_LICENSE("GPL");