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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Support for the FTS Systemmonitoring Chip "Teutates"
4 *
5 * Copyright (C) 2016 Fujitsu Technology Solutions GmbH,
6 * Thilo Cestonaro <[email protected]>
7 */
8#include <linux/err.h>
9#include <linux/hwmon.h>
10#include <linux/i2c.h>
11#include <linux/init.h>
12#include <linux/jiffies.h>
13#include <linux/math.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/watchdog.h>
17
18#define FTS_DEVICE_ID_REG 0x0000
19#define FTS_DEVICE_REVISION_REG 0x0001
20#define FTS_DEVICE_STATUS_REG 0x0004
21#define FTS_SATELLITE_STATUS_REG 0x0005
22#define FTS_EVENT_STATUS_REG 0x0006
23#define FTS_GLOBAL_CONTROL_REG 0x0007
24
25#define FTS_DEVICE_DETECT_REG_1 0x0C
26#define FTS_DEVICE_DETECT_REG_2 0x0D
27#define FTS_DEVICE_DETECT_REG_3 0x0E
28
29#define FTS_SENSOR_EVENT_REG 0x0010
30
31#define FTS_FAN_EVENT_REG 0x0014
32#define FTS_FAN_PRESENT_REG 0x0015
33
34#define FTS_POWER_ON_TIME_COUNTER_A 0x007A
35#define FTS_POWER_ON_TIME_COUNTER_B 0x007B
36#define FTS_POWER_ON_TIME_COUNTER_C 0x007C
37
38#define FTS_PAGE_SELECT_REG 0x007F
39
40#define FTS_WATCHDOG_TIME_PRESET 0x000B
41#define FTS_WATCHDOG_CONTROL 0x5081
42
43#define FTS_NO_FAN_SENSORS 0x08
44#define FTS_NO_TEMP_SENSORS 0x10
45#define FTS_NO_VOLT_SENSORS 0x04
46
47#define FTS_FAN_SOURCE_INVALID 0xff
48
49static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
50
51static const struct i2c_device_id fts_id[] = {
52 { .name = "ftsteutates" },
53 { }
54};
55MODULE_DEVICE_TABLE(i2c, fts_id);
56
57enum WATCHDOG_RESOLUTION {
58 seconds = 1,
59 minutes = 60
60};
61
62struct fts_data {
63 struct i2c_client *client;
64 unsigned long last_updated; /* in jiffies */
65 struct watchdog_device wdd;
66 enum WATCHDOG_RESOLUTION resolution;
67 bool valid; /* false until following fields are valid */
68
69 u8 volt[FTS_NO_VOLT_SENSORS];
70
71 u8 temp_input[FTS_NO_TEMP_SENSORS];
72 u8 temp_alarm;
73
74 u8 fan_present;
75 u8 fan_input[FTS_NO_FAN_SENSORS]; /* in rps */
76 u8 fan_source[FTS_NO_FAN_SENSORS];
77 u8 fan_alarm;
78};
79
80#define FTS_REG_FAN_INPUT(idx) ((idx) + 0x20)
81#define FTS_REG_FAN_SOURCE(idx) ((idx) + 0x30)
82#define FTS_REG_FAN_CONTROL(idx) (((idx) << 16) + 0x4881)
83
84#define FTS_REG_TEMP_INPUT(idx) ((idx) + 0x40)
85#define FTS_REG_TEMP_CONTROL(idx) (((idx) << 16) + 0x0681)
86
87#define FTS_REG_VOLT(idx) ((idx) + 0x18)
88
89/*****************************************************************************/
90/* I2C Helper functions */
91/*****************************************************************************/
92static int fts_read_byte(struct i2c_client *client, unsigned short reg)
93{
94 int ret;
95 unsigned char page = reg >> 8;
96
97 dev_dbg(&client->dev, "page select - page: 0x%.02x\n", page);
98 ret = i2c_smbus_write_byte_data(client, FTS_PAGE_SELECT_REG, page);
99 if (ret < 0)
100 return ret;
101
102 reg &= 0xFF;
103 ret = i2c_smbus_read_byte_data(client, reg);
104 dev_dbg(&client->dev, "read - reg: 0x%.02x: val: 0x%.02x\n", reg, ret);
105 return ret;
106}
107
108static int fts_write_byte(struct i2c_client *client, unsigned short reg,
109 unsigned char value)
110{
111 int ret;
112 unsigned char page = reg >> 8;
113
114 dev_dbg(&client->dev, "page select - page: 0x%.02x\n", page);
115 ret = i2c_smbus_write_byte_data(client, FTS_PAGE_SELECT_REG, page);
116 if (ret < 0)
117 return ret;
118
119 reg &= 0xFF;
120 dev_dbg(&client->dev,
121 "write - reg: 0x%.02x: val: 0x%.02x\n", reg, value);
122 ret = i2c_smbus_write_byte_data(client, reg, value);
123 return ret;
124}
125
126/*****************************************************************************/
127/* Data Updater Helper function */
128/*****************************************************************************/
129static int fts_update_device(struct fts_data *data)
130{
131 int i, err;
132
133 if (!time_after(jiffies, data->last_updated + 2 * HZ) && data->valid)
134 return 0;
135
136 err = fts_read_byte(data->client, FTS_DEVICE_STATUS_REG);
137 if (err < 0)
138 return err;
139
140 data->valid = !!(err & 0x02); /* Data not ready yet */
141 if (unlikely(!data->valid))
142 return -EAGAIN;
143
144 err = fts_read_byte(data->client, FTS_FAN_PRESENT_REG);
145 if (err < 0)
146 return err;
147 data->fan_present = err;
148
149 err = fts_read_byte(data->client, FTS_FAN_EVENT_REG);
150 if (err < 0)
151 return err;
152 data->fan_alarm = err;
153
154 for (i = 0; i < FTS_NO_FAN_SENSORS; i++) {
155 if (data->fan_present & BIT(i)) {
156 err = fts_read_byte(data->client, FTS_REG_FAN_INPUT(i));
157 if (err < 0)
158 return err;
159 data->fan_input[i] = err;
160
161 err = fts_read_byte(data->client,
162 FTS_REG_FAN_SOURCE(i));
163 if (err < 0)
164 return err;
165 data->fan_source[i] = err;
166 } else {
167 data->fan_input[i] = 0;
168 data->fan_source[i] = FTS_FAN_SOURCE_INVALID;
169 }
170 }
171
172 err = fts_read_byte(data->client, FTS_SENSOR_EVENT_REG);
173 if (err < 0)
174 return err;
175 data->temp_alarm = err;
176
177 for (i = 0; i < FTS_NO_TEMP_SENSORS; i++) {
178 err = fts_read_byte(data->client, FTS_REG_TEMP_INPUT(i));
179 if (err < 0)
180 return err;
181 data->temp_input[i] = err;
182 }
183
184 for (i = 0; i < FTS_NO_VOLT_SENSORS; i++) {
185 err = fts_read_byte(data->client, FTS_REG_VOLT(i));
186 if (err < 0)
187 return err;
188 data->volt[i] = err;
189 }
190 data->last_updated = jiffies;
191 return 0;
192}
193
194/*****************************************************************************/
195/* Watchdog functions */
196/*****************************************************************************/
197static int fts_wd_set_resolution(struct fts_data *data,
198 enum WATCHDOG_RESOLUTION resolution)
199{
200 int ret;
201
202 if (data->resolution == resolution)
203 return 0;
204
205 ret = fts_read_byte(data->client, FTS_WATCHDOG_CONTROL);
206 if (ret < 0)
207 return ret;
208
209 if ((resolution == seconds && ret & BIT(1)) ||
210 (resolution == minutes && (ret & BIT(1)) == 0)) {
211 data->resolution = resolution;
212 return 0;
213 }
214
215 if (resolution == seconds)
216 ret |= BIT(1);
217 else
218 ret &= ~BIT(1);
219
220 ret = fts_write_byte(data->client, FTS_WATCHDOG_CONTROL, ret);
221 if (ret < 0)
222 return ret;
223
224 data->resolution = resolution;
225 return ret;
226}
227
228static int fts_wd_set_timeout(struct watchdog_device *wdd, unsigned int timeout)
229{
230 struct fts_data *data;
231 enum WATCHDOG_RESOLUTION resolution = seconds;
232 int ret;
233
234 data = watchdog_get_drvdata(wdd);
235 /* switch watchdog resolution to minutes if timeout does not fit
236 * into a byte
237 */
238 if (timeout > 0xFF) {
239 timeout = DIV_ROUND_UP(timeout, 60) * 60;
240 resolution = minutes;
241 }
242
243 ret = fts_wd_set_resolution(data, resolution);
244 if (ret < 0)
245 return ret;
246
247 wdd->timeout = timeout;
248 return 0;
249}
250
251static int fts_wd_start(struct watchdog_device *wdd)
252{
253 struct fts_data *data = watchdog_get_drvdata(wdd);
254
255 return fts_write_byte(data->client, FTS_WATCHDOG_TIME_PRESET,
256 wdd->timeout / (u8)data->resolution);
257}
258
259static int fts_wd_stop(struct watchdog_device *wdd)
260{
261 struct fts_data *data;
262
263 data = watchdog_get_drvdata(wdd);
264 return fts_write_byte(data->client, FTS_WATCHDOG_TIME_PRESET, 0);
265}
266
267static const struct watchdog_info fts_wd_info = {
268 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
269 .identity = "FTS Teutates Hardware Watchdog",
270};
271
272static const struct watchdog_ops fts_wd_ops = {
273 .owner = THIS_MODULE,
274 .start = fts_wd_start,
275 .stop = fts_wd_stop,
276 .set_timeout = fts_wd_set_timeout,
277};
278
279static int fts_watchdog_init(struct fts_data *data)
280{
281 int timeout, ret;
282
283 watchdog_set_drvdata(&data->wdd, data);
284
285 timeout = fts_read_byte(data->client, FTS_WATCHDOG_TIME_PRESET);
286 if (timeout < 0)
287 return timeout;
288
289 /* watchdog not running, set timeout to a default of 60 sec. */
290 if (timeout == 0) {
291 ret = fts_wd_set_resolution(data, seconds);
292 if (ret < 0)
293 return ret;
294 data->wdd.timeout = 60;
295 } else {
296 ret = fts_read_byte(data->client, FTS_WATCHDOG_CONTROL);
297 if (ret < 0)
298 return ret;
299
300 data->resolution = ret & BIT(1) ? seconds : minutes;
301 data->wdd.timeout = timeout * (u8)data->resolution;
302 set_bit(WDOG_HW_RUNNING, &data->wdd.status);
303 }
304
305 /* Register our watchdog part */
306 data->wdd.info = &fts_wd_info;
307 data->wdd.ops = &fts_wd_ops;
308 data->wdd.parent = &data->client->dev;
309 data->wdd.min_timeout = 1;
310
311 /* max timeout 255 minutes. */
312 data->wdd.max_hw_heartbeat_ms = 0xFF * 60 * MSEC_PER_SEC;
313
314 return devm_watchdog_register_device(&data->client->dev, &data->wdd);
315}
316
317static umode_t fts_is_visible(const void *devdata, enum hwmon_sensor_types type, u32 attr,
318 int channel)
319{
320 switch (type) {
321 case hwmon_temp:
322 switch (attr) {
323 case hwmon_temp_input:
324 case hwmon_temp_fault:
325 return 0444;
326 case hwmon_temp_alarm:
327 return 0644;
328 default:
329 break;
330 }
331 break;
332 case hwmon_fan:
333 switch (attr) {
334 case hwmon_fan_input:
335 case hwmon_fan_fault:
336 return 0444;
337 case hwmon_fan_alarm:
338 return 0644;
339 default:
340 break;
341 }
342 break;
343 case hwmon_pwm:
344 case hwmon_in:
345 return 0444;
346 default:
347 break;
348 }
349
350 return 0;
351}
352
353static int fts_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
354 long *val)
355{
356 struct fts_data *data = dev_get_drvdata(dev);
357 int ret = fts_update_device(data);
358
359 if (ret < 0)
360 return ret;
361
362 switch (type) {
363 case hwmon_temp:
364 switch (attr) {
365 case hwmon_temp_input:
366 *val = (data->temp_input[channel] - 64) * 1000;
367
368 return 0;
369 case hwmon_temp_alarm:
370 *val = !!(data->temp_alarm & BIT(channel));
371
372 return 0;
373 case hwmon_temp_fault:
374 /* 00h Temperature = Sensor Error */;
375 *val = (data->temp_input[channel] == 0);
376
377 return 0;
378 default:
379 break;
380 }
381 break;
382 case hwmon_fan:
383 switch (attr) {
384 case hwmon_fan_input:
385 *val = data->fan_input[channel] * 60;
386
387 return 0;
388 case hwmon_fan_alarm:
389 *val = !!(data->fan_alarm & BIT(channel));
390
391 return 0;
392 case hwmon_fan_fault:
393 *val = !(data->fan_present & BIT(channel));
394
395 return 0;
396 default:
397 break;
398 }
399 break;
400 case hwmon_pwm:
401 switch (attr) {
402 case hwmon_pwm_auto_channels_temp: {
403 u8 fan_source = data->fan_source[channel];
404
405 if (fan_source == FTS_FAN_SOURCE_INVALID || fan_source >= BITS_PER_LONG)
406 *val = 0;
407 else
408 *val = BIT(fan_source);
409
410 return 0;
411 }
412 default:
413 break;
414 }
415 break;
416 case hwmon_in:
417 switch (attr) {
418 case hwmon_in_input:
419 *val = DIV_ROUND_CLOSEST(data->volt[channel] * 3300, 255);
420
421 return 0;
422 default:
423 break;
424 }
425 break;
426 default:
427 break;
428 }
429
430 return -EOPNOTSUPP;
431}
432
433static int fts_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
434 long val)
435{
436 struct fts_data *data = dev_get_drvdata(dev);
437 int ret = fts_update_device(data);
438
439 if (ret < 0)
440 return ret;
441
442 switch (type) {
443 case hwmon_temp:
444 switch (attr) {
445 case hwmon_temp_alarm:
446 if (val)
447 return -EINVAL;
448
449 ret = fts_read_byte(data->client, FTS_REG_TEMP_CONTROL(channel));
450 if (ret < 0)
451 return ret;
452 ret = fts_write_byte(data->client, FTS_REG_TEMP_CONTROL(channel),
453 ret | 0x1);
454 if (ret < 0)
455 return ret;
456 data->valid = false;
457 return 0;
458 default:
459 break;
460 }
461 break;
462 case hwmon_fan:
463 switch (attr) {
464 case hwmon_fan_alarm:
465 if (val)
466 return -EINVAL;
467
468 ret = fts_read_byte(data->client, FTS_REG_FAN_CONTROL(channel));
469 if (ret < 0)
470 return ret;
471 ret = fts_write_byte(data->client, FTS_REG_FAN_CONTROL(channel),
472 ret | 0x1);
473 if (ret < 0)
474 return ret;
475 data->valid = false;
476 return 0;
477 default:
478 break;
479 }
480 break;
481 default:
482 break;
483 }
484
485 return -EOPNOTSUPP;
486}
487
488static const struct hwmon_ops fts_ops = {
489 .is_visible = fts_is_visible,
490 .read = fts_read,
491 .write = fts_write,
492};
493
494static const struct hwmon_channel_info * const fts_info[] = {
495 HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
496 HWMON_CHANNEL_INFO(temp,
497 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
498 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
499 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
500 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
501 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
502 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
503 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
504 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
505 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
506 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
507 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
508 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
509 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
510 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
511 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT,
512 HWMON_T_INPUT | HWMON_T_ALARM | HWMON_T_FAULT
513 ),
514 HWMON_CHANNEL_INFO(fan,
515 HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
516 HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
517 HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
518 HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
519 HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
520 HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
521 HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT,
522 HWMON_F_INPUT | HWMON_F_ALARM | HWMON_F_FAULT
523 ),
524 HWMON_CHANNEL_INFO(pwm,
525 HWMON_PWM_AUTO_CHANNELS_TEMP,
526 HWMON_PWM_AUTO_CHANNELS_TEMP,
527 HWMON_PWM_AUTO_CHANNELS_TEMP,
528 HWMON_PWM_AUTO_CHANNELS_TEMP,
529 HWMON_PWM_AUTO_CHANNELS_TEMP,
530 HWMON_PWM_AUTO_CHANNELS_TEMP,
531 HWMON_PWM_AUTO_CHANNELS_TEMP,
532 HWMON_PWM_AUTO_CHANNELS_TEMP
533 ),
534 HWMON_CHANNEL_INFO(in,
535 HWMON_I_INPUT,
536 HWMON_I_INPUT,
537 HWMON_I_INPUT,
538 HWMON_I_INPUT
539 ),
540 NULL
541};
542
543static const struct hwmon_chip_info fts_chip_info = {
544 .ops = &fts_ops,
545 .info = fts_info,
546};
547
548/*****************************************************************************/
549/* Module initialization / remove functions */
550/*****************************************************************************/
551static int fts_detect(struct i2c_client *client,
552 struct i2c_board_info *info)
553{
554 int val;
555
556 /* detection works with revision greater or equal to 0x2b */
557 val = i2c_smbus_read_byte_data(client, FTS_DEVICE_REVISION_REG);
558 if (val < 0x2b)
559 return -ENODEV;
560
561 /* Device Detect Regs must have 0x17 0x34 and 0x54 */
562 val = i2c_smbus_read_byte_data(client, FTS_DEVICE_DETECT_REG_1);
563 if (val != 0x17)
564 return -ENODEV;
565
566 val = i2c_smbus_read_byte_data(client, FTS_DEVICE_DETECT_REG_2);
567 if (val != 0x34)
568 return -ENODEV;
569
570 val = i2c_smbus_read_byte_data(client, FTS_DEVICE_DETECT_REG_3);
571 if (val != 0x54)
572 return -ENODEV;
573
574 /*
575 * 0x10 == Baseboard Management Controller, 0x01 == Teutates
576 * Device ID Reg needs to be 0x11
577 */
578 val = i2c_smbus_read_byte_data(client, FTS_DEVICE_ID_REG);
579 if (val != 0x11)
580 return -ENODEV;
581
582 strscpy(info->type, fts_id[0].name, I2C_NAME_SIZE);
583 info->flags = 0;
584 return 0;
585}
586
587static int fts_probe(struct i2c_client *client)
588{
589 u8 revision;
590 struct fts_data *data;
591 int err;
592 s8 deviceid;
593 struct device *hwmon_dev;
594
595 if (client->addr != 0x73)
596 return -ENODEV;
597
598 /* Baseboard Management Controller check */
599 deviceid = i2c_smbus_read_byte_data(client, FTS_DEVICE_ID_REG);
600 if (deviceid > 0 && (deviceid & 0xF0) == 0x10) {
601 switch (deviceid & 0x0F) {
602 case 0x01:
603 break;
604 default:
605 dev_dbg(&client->dev,
606 "No Baseboard Management Controller\n");
607 return -ENODEV;
608 }
609 } else {
610 dev_dbg(&client->dev, "No fujitsu board\n");
611 return -ENODEV;
612 }
613
614 data = devm_kzalloc(&client->dev, sizeof(struct fts_data),
615 GFP_KERNEL);
616 if (!data)
617 return -ENOMEM;
618
619 data->client = client;
620 dev_set_drvdata(&client->dev, data);
621
622 err = i2c_smbus_read_byte_data(client, FTS_DEVICE_REVISION_REG);
623 if (err < 0)
624 return err;
625 revision = err;
626
627 hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, "ftsteutates", data,
628 &fts_chip_info, NULL);
629 if (IS_ERR(hwmon_dev))
630 return PTR_ERR(hwmon_dev);
631
632 err = fts_watchdog_init(data);
633 if (err)
634 return err;
635
636 dev_info(&client->dev, "Detected FTS Teutates chip, revision: %d.%d\n",
637 (revision & 0xF0) >> 4, revision & 0x0F);
638 return 0;
639}
640
641/*****************************************************************************/
642/* Module Details */
643/*****************************************************************************/
644static struct i2c_driver fts_driver = {
645 .class = I2C_CLASS_HWMON,
646 .driver = {
647 .name = "ftsteutates",
648 },
649 .id_table = fts_id,
650 .probe = fts_probe,
651 .detect = fts_detect,
652 .address_list = normal_i2c,
653};
654
655module_i2c_driver(fts_driver);
656
657MODULE_AUTHOR("Thilo Cestonaro <[email protected]>");
658MODULE_DESCRIPTION("FTS Teutates driver");
659MODULE_LICENSE("GPL");