1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /***************************************************************************
3 * Copyright (C) 2011-2012 Hans de Goede <hdegoede@redhat.com> *
4 * *
5 ***************************************************************************/
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9 #include <linux/module.h>
10 #include <linux/mod_devicetable.h>
11 #include <linux/init.h>
12 #include <linux/slab.h>
13 #include <linux/jiffies.h>
14 #include <linux/platform_device.h>
15 #include <linux/hwmon.h>
16 #include <linux/hwmon-sysfs.h>
17 #include <linux/err.h>
18 #include <linux/mutex.h>
19 #include "sch56xx-common.h"
20
21 #define DRVNAME "sch5636"
22 #define DEVNAME "theseus" /* We only support one model for now */
23
24 #define SCH5636_REG_FUJITSU_ID 0x780
25 #define SCH5636_REG_FUJITSU_REV 0x783
26
27 #define SCH5636_NO_INS 5
28 #define SCH5636_NO_TEMPS 16
29 #define SCH5636_NO_FANS 8
30
31 static const u16 SCH5636_REG_IN_VAL[SCH5636_NO_INS] = {
32 0x22, 0x23, 0x24, 0x25, 0x189 };
33 static const u16 SCH5636_REG_IN_FACTORS[SCH5636_NO_INS] = {
34 4400, 1500, 4000, 4400, 16000 };
35 static const char * const SCH5636_IN_LABELS[SCH5636_NO_INS] = {
36 "3.3V", "VREF", "VBAT", "3.3AUX", "12V" };
37
38 static const u16 SCH5636_REG_TEMP_VAL[SCH5636_NO_TEMPS] = {
39 0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181,
40 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C };
41 #define SCH5636_REG_TEMP_CTRL(i) (0x790 + (i))
42 #define SCH5636_TEMP_WORKING 0x01
43 #define SCH5636_TEMP_ALARM 0x02
44 #define SCH5636_TEMP_DEACTIVATED 0x80
45
46 static const u16 SCH5636_REG_FAN_VAL[SCH5636_NO_FANS] = {
47 0x2C, 0x2E, 0x30, 0x32, 0x62, 0x64, 0x66, 0x68 };
48 #define SCH5636_REG_FAN_CTRL(i) (0x880 + (i))
49 /* FAULT in datasheet, but acts as an alarm */
50 #define SCH5636_FAN_ALARM 0x04
51 #define SCH5636_FAN_NOT_PRESENT 0x08
52 #define SCH5636_FAN_DEACTIVATED 0x80
53
54
55 struct sch5636_data {
56 unsigned short addr;
57 struct device *hwmon_dev;
58
59 struct mutex update_lock;
60 bool valid; /* true if following fields are valid */
61 unsigned long last_updated; /* In jiffies */
62 u8 in[SCH5636_NO_INS];
63 u8 temp_val[SCH5636_NO_TEMPS];
64 u8 temp_ctrl[SCH5636_NO_TEMPS];
65 u16 fan_val[SCH5636_NO_FANS];
66 u8 fan_ctrl[SCH5636_NO_FANS];
67 };
68
sch5636_update_device(struct device * dev)69 static struct sch5636_data *sch5636_update_device(struct device *dev)
70 {
71 struct sch5636_data *data = dev_get_drvdata(dev);
72 struct sch5636_data *ret = data;
73 int i, val;
74
75 mutex_lock(&data->update_lock);
76
77 /* Cache the values for 1 second */
78 if (data->valid && !time_after(jiffies, data->last_updated + HZ))
79 goto abort;
80
81 for (i = 0; i < SCH5636_NO_INS; i++) {
82 val = sch56xx_read_virtual_reg(data->addr,
83 SCH5636_REG_IN_VAL[i]);
84 if (unlikely(val < 0)) {
85 ret = ERR_PTR(val);
86 goto abort;
87 }
88 data->in[i] = val;
89 }
90
91 for (i = 0; i < SCH5636_NO_TEMPS; i++) {
92 if (data->temp_ctrl[i] & SCH5636_TEMP_DEACTIVATED)
93 continue;
94
95 val = sch56xx_read_virtual_reg(data->addr,
96 SCH5636_REG_TEMP_VAL[i]);
97 if (unlikely(val < 0)) {
98 ret = ERR_PTR(val);
99 goto abort;
100 }
101 data->temp_val[i] = val;
102
103 val = sch56xx_read_virtual_reg(data->addr,
104 SCH5636_REG_TEMP_CTRL(i));
105 if (unlikely(val < 0)) {
106 ret = ERR_PTR(val);
107 goto abort;
108 }
109 data->temp_ctrl[i] = val;
110 /* Alarms need to be explicitly write-cleared */
111 if (val & SCH5636_TEMP_ALARM) {
112 sch56xx_write_virtual_reg(data->addr,
113 SCH5636_REG_TEMP_CTRL(i), val);
114 }
115 }
116
117 for (i = 0; i < SCH5636_NO_FANS; i++) {
118 if (data->fan_ctrl[i] & SCH5636_FAN_DEACTIVATED)
119 continue;
120
121 val = sch56xx_read_virtual_reg16(data->addr,
122 SCH5636_REG_FAN_VAL[i]);
123 if (unlikely(val < 0)) {
124 ret = ERR_PTR(val);
125 goto abort;
126 }
127 data->fan_val[i] = val;
128
129 val = sch56xx_read_virtual_reg(data->addr,
130 SCH5636_REG_FAN_CTRL(i));
131 if (unlikely(val < 0)) {
132 ret = ERR_PTR(val);
133 goto abort;
134 }
135 data->fan_ctrl[i] = val;
136 /* Alarms need to be explicitly write-cleared */
137 if (val & SCH5636_FAN_ALARM) {
138 sch56xx_write_virtual_reg(data->addr,
139 SCH5636_REG_FAN_CTRL(i), val);
140 }
141 }
142
143 data->last_updated = jiffies;
144 data->valid = true;
145 abort:
146 mutex_unlock(&data->update_lock);
147 return ret;
148 }
149
reg_to_rpm(u16 reg)150 static int reg_to_rpm(u16 reg)
151 {
152 if (reg == 0)
153 return -EIO;
154 if (reg == 0xffff)
155 return 0;
156
157 return 5400540 / reg;
158 }
159
name_show(struct device * dev,struct device_attribute * devattr,char * buf)160 static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
161 char *buf)
162 {
163 return sysfs_emit(buf, "%s\n", DEVNAME);
164 }
165
in_value_show(struct device * dev,struct device_attribute * devattr,char * buf)166 static ssize_t in_value_show(struct device *dev,
167 struct device_attribute *devattr, char *buf)
168 {
169 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
170 struct sch5636_data *data = sch5636_update_device(dev);
171 int val;
172
173 if (IS_ERR(data))
174 return PTR_ERR(data);
175
176 val = DIV_ROUND_CLOSEST(
177 data->in[attr->index] * SCH5636_REG_IN_FACTORS[attr->index],
178 255);
179 return sysfs_emit(buf, "%d\n", val);
180 }
181
in_label_show(struct device * dev,struct device_attribute * devattr,char * buf)182 static ssize_t in_label_show(struct device *dev,
183 struct device_attribute *devattr, char *buf)
184 {
185 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
186
187 return sysfs_emit(buf, "%s\n",
188 SCH5636_IN_LABELS[attr->index]);
189 }
190
temp_value_show(struct device * dev,struct device_attribute * devattr,char * buf)191 static ssize_t temp_value_show(struct device *dev,
192 struct device_attribute *devattr, char *buf)
193 {
194 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
195 struct sch5636_data *data = sch5636_update_device(dev);
196 int val;
197
198 if (IS_ERR(data))
199 return PTR_ERR(data);
200
201 val = (data->temp_val[attr->index] - 64) * 1000;
202 return sysfs_emit(buf, "%d\n", val);
203 }
204
temp_fault_show(struct device * dev,struct device_attribute * devattr,char * buf)205 static ssize_t temp_fault_show(struct device *dev,
206 struct device_attribute *devattr, char *buf)
207 {
208 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
209 struct sch5636_data *data = sch5636_update_device(dev);
210 int val;
211
212 if (IS_ERR(data))
213 return PTR_ERR(data);
214
215 val = (data->temp_ctrl[attr->index] & SCH5636_TEMP_WORKING) ? 0 : 1;
216 return sysfs_emit(buf, "%d\n", val);
217 }
218
temp_alarm_show(struct device * dev,struct device_attribute * devattr,char * buf)219 static ssize_t temp_alarm_show(struct device *dev,
220 struct device_attribute *devattr, char *buf)
221 {
222 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
223 struct sch5636_data *data = sch5636_update_device(dev);
224 int val;
225
226 if (IS_ERR(data))
227 return PTR_ERR(data);
228
229 val = (data->temp_ctrl[attr->index] & SCH5636_TEMP_ALARM) ? 1 : 0;
230 return sysfs_emit(buf, "%d\n", val);
231 }
232
fan_value_show(struct device * dev,struct device_attribute * devattr,char * buf)233 static ssize_t fan_value_show(struct device *dev,
234 struct device_attribute *devattr, char *buf)
235 {
236 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
237 struct sch5636_data *data = sch5636_update_device(dev);
238 int val;
239
240 if (IS_ERR(data))
241 return PTR_ERR(data);
242
243 val = reg_to_rpm(data->fan_val[attr->index]);
244 if (val < 0)
245 return val;
246
247 return sysfs_emit(buf, "%d\n", val);
248 }
249
fan_fault_show(struct device * dev,struct device_attribute * devattr,char * buf)250 static ssize_t fan_fault_show(struct device *dev,
251 struct device_attribute *devattr, char *buf)
252 {
253 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
254 struct sch5636_data *data = sch5636_update_device(dev);
255 int val;
256
257 if (IS_ERR(data))
258 return PTR_ERR(data);
259
260 val = (data->fan_ctrl[attr->index] & SCH5636_FAN_NOT_PRESENT) ? 1 : 0;
261 return sysfs_emit(buf, "%d\n", val);
262 }
263
fan_alarm_show(struct device * dev,struct device_attribute * devattr,char * buf)264 static ssize_t fan_alarm_show(struct device *dev,
265 struct device_attribute *devattr, char *buf)
266 {
267 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
268 struct sch5636_data *data = sch5636_update_device(dev);
269 int val;
270
271 if (IS_ERR(data))
272 return PTR_ERR(data);
273
274 val = (data->fan_ctrl[attr->index] & SCH5636_FAN_ALARM) ? 1 : 0;
275 return sysfs_emit(buf, "%d\n", val);
276 }
277
278 static struct sensor_device_attribute sch5636_attr[] = {
279 SENSOR_ATTR_RO(name, name, 0),
280 SENSOR_ATTR_RO(in0_input, in_value, 0),
281 SENSOR_ATTR_RO(in0_label, in_label, 0),
282 SENSOR_ATTR_RO(in1_input, in_value, 1),
283 SENSOR_ATTR_RO(in1_label, in_label, 1),
284 SENSOR_ATTR_RO(in2_input, in_value, 2),
285 SENSOR_ATTR_RO(in2_label, in_label, 2),
286 SENSOR_ATTR_RO(in3_input, in_value, 3),
287 SENSOR_ATTR_RO(in3_label, in_label, 3),
288 SENSOR_ATTR_RO(in4_input, in_value, 4),
289 SENSOR_ATTR_RO(in4_label, in_label, 4),
290 };
291
292 static struct sensor_device_attribute sch5636_temp_attr[] = {
293 SENSOR_ATTR_RO(temp1_input, temp_value, 0),
294 SENSOR_ATTR_RO(temp1_fault, temp_fault, 0),
295 SENSOR_ATTR_RO(temp1_alarm, temp_alarm, 0),
296 SENSOR_ATTR_RO(temp2_input, temp_value, 1),
297 SENSOR_ATTR_RO(temp2_fault, temp_fault, 1),
298 SENSOR_ATTR_RO(temp2_alarm, temp_alarm, 1),
299 SENSOR_ATTR_RO(temp3_input, temp_value, 2),
300 SENSOR_ATTR_RO(temp3_fault, temp_fault, 2),
301 SENSOR_ATTR_RO(temp3_alarm, temp_alarm, 2),
302 SENSOR_ATTR_RO(temp4_input, temp_value, 3),
303 SENSOR_ATTR_RO(temp4_fault, temp_fault, 3),
304 SENSOR_ATTR_RO(temp4_alarm, temp_alarm, 3),
305 SENSOR_ATTR_RO(temp5_input, temp_value, 4),
306 SENSOR_ATTR_RO(temp5_fault, temp_fault, 4),
307 SENSOR_ATTR_RO(temp5_alarm, temp_alarm, 4),
308 SENSOR_ATTR_RO(temp6_input, temp_value, 5),
309 SENSOR_ATTR_RO(temp6_fault, temp_fault, 5),
310 SENSOR_ATTR_RO(temp6_alarm, temp_alarm, 5),
311 SENSOR_ATTR_RO(temp7_input, temp_value, 6),
312 SENSOR_ATTR_RO(temp7_fault, temp_fault, 6),
313 SENSOR_ATTR_RO(temp7_alarm, temp_alarm, 6),
314 SENSOR_ATTR_RO(temp8_input, temp_value, 7),
315 SENSOR_ATTR_RO(temp8_fault, temp_fault, 7),
316 SENSOR_ATTR_RO(temp8_alarm, temp_alarm, 7),
317 SENSOR_ATTR_RO(temp9_input, temp_value, 8),
318 SENSOR_ATTR_RO(temp9_fault, temp_fault, 8),
319 SENSOR_ATTR_RO(temp9_alarm, temp_alarm, 8),
320 SENSOR_ATTR_RO(temp10_input, temp_value, 9),
321 SENSOR_ATTR_RO(temp10_fault, temp_fault, 9),
322 SENSOR_ATTR_RO(temp10_alarm, temp_alarm, 9),
323 SENSOR_ATTR_RO(temp11_input, temp_value, 10),
324 SENSOR_ATTR_RO(temp11_fault, temp_fault, 10),
325 SENSOR_ATTR_RO(temp11_alarm, temp_alarm, 10),
326 SENSOR_ATTR_RO(temp12_input, temp_value, 11),
327 SENSOR_ATTR_RO(temp12_fault, temp_fault, 11),
328 SENSOR_ATTR_RO(temp12_alarm, temp_alarm, 11),
329 SENSOR_ATTR_RO(temp13_input, temp_value, 12),
330 SENSOR_ATTR_RO(temp13_fault, temp_fault, 12),
331 SENSOR_ATTR_RO(temp13_alarm, temp_alarm, 12),
332 SENSOR_ATTR_RO(temp14_input, temp_value, 13),
333 SENSOR_ATTR_RO(temp14_fault, temp_fault, 13),
334 SENSOR_ATTR_RO(temp14_alarm, temp_alarm, 13),
335 SENSOR_ATTR_RO(temp15_input, temp_value, 14),
336 SENSOR_ATTR_RO(temp15_fault, temp_fault, 14),
337 SENSOR_ATTR_RO(temp15_alarm, temp_alarm, 14),
338 SENSOR_ATTR_RO(temp16_input, temp_value, 15),
339 SENSOR_ATTR_RO(temp16_fault, temp_fault, 15),
340 SENSOR_ATTR_RO(temp16_alarm, temp_alarm, 15),
341 };
342
343 static struct sensor_device_attribute sch5636_fan_attr[] = {
344 SENSOR_ATTR_RO(fan1_input, fan_value, 0),
345 SENSOR_ATTR_RO(fan1_fault, fan_fault, 0),
346 SENSOR_ATTR_RO(fan1_alarm, fan_alarm, 0),
347 SENSOR_ATTR_RO(fan2_input, fan_value, 1),
348 SENSOR_ATTR_RO(fan2_fault, fan_fault, 1),
349 SENSOR_ATTR_RO(fan2_alarm, fan_alarm, 1),
350 SENSOR_ATTR_RO(fan3_input, fan_value, 2),
351 SENSOR_ATTR_RO(fan3_fault, fan_fault, 2),
352 SENSOR_ATTR_RO(fan3_alarm, fan_alarm, 2),
353 SENSOR_ATTR_RO(fan4_input, fan_value, 3),
354 SENSOR_ATTR_RO(fan4_fault, fan_fault, 3),
355 SENSOR_ATTR_RO(fan4_alarm, fan_alarm, 3),
356 SENSOR_ATTR_RO(fan5_input, fan_value, 4),
357 SENSOR_ATTR_RO(fan5_fault, fan_fault, 4),
358 SENSOR_ATTR_RO(fan5_alarm, fan_alarm, 4),
359 SENSOR_ATTR_RO(fan6_input, fan_value, 5),
360 SENSOR_ATTR_RO(fan6_fault, fan_fault, 5),
361 SENSOR_ATTR_RO(fan6_alarm, fan_alarm, 5),
362 SENSOR_ATTR_RO(fan7_input, fan_value, 6),
363 SENSOR_ATTR_RO(fan7_fault, fan_fault, 6),
364 SENSOR_ATTR_RO(fan7_alarm, fan_alarm, 6),
365 SENSOR_ATTR_RO(fan8_input, fan_value, 7),
366 SENSOR_ATTR_RO(fan8_fault, fan_fault, 7),
367 SENSOR_ATTR_RO(fan8_alarm, fan_alarm, 7),
368 };
369
sch5636_remove(struct platform_device * pdev)370 static int sch5636_remove(struct platform_device *pdev)
371 {
372 struct sch5636_data *data = platform_get_drvdata(pdev);
373 int i;
374
375 if (data->hwmon_dev)
376 hwmon_device_unregister(data->hwmon_dev);
377
378 for (i = 0; i < ARRAY_SIZE(sch5636_attr); i++)
379 device_remove_file(&pdev->dev, &sch5636_attr[i].dev_attr);
380
381 for (i = 0; i < SCH5636_NO_TEMPS * 3; i++)
382 device_remove_file(&pdev->dev,
383 &sch5636_temp_attr[i].dev_attr);
384
385 for (i = 0; i < SCH5636_NO_FANS * 3; i++)
386 device_remove_file(&pdev->dev,
387 &sch5636_fan_attr[i].dev_attr);
388
389 return 0;
390 }
391
sch5636_probe(struct platform_device * pdev)392 static int sch5636_probe(struct platform_device *pdev)
393 {
394 struct sch5636_data *data;
395 int i, err, val, revision[2];
396 char id[4];
397
398 data = devm_kzalloc(&pdev->dev, sizeof(struct sch5636_data),
399 GFP_KERNEL);
400 if (!data)
401 return -ENOMEM;
402
403 data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start;
404 mutex_init(&data->update_lock);
405 platform_set_drvdata(pdev, data);
406
407 for (i = 0; i < 3; i++) {
408 val = sch56xx_read_virtual_reg(data->addr,
409 SCH5636_REG_FUJITSU_ID + i);
410 if (val < 0) {
411 pr_err("Could not read Fujitsu id byte at %#x\n",
412 SCH5636_REG_FUJITSU_ID + i);
413 err = val;
414 goto error;
415 }
416 id[i] = val;
417 }
418 id[i] = '\0';
419
420 if (strcmp(id, "THS")) {
421 pr_err("Unknown Fujitsu id: %02x%02x%02x\n",
422 id[0], id[1], id[2]);
423 err = -ENODEV;
424 goto error;
425 }
426
427 for (i = 0; i < 2; i++) {
428 val = sch56xx_read_virtual_reg(data->addr,
429 SCH5636_REG_FUJITSU_REV + i);
430 if (val < 0) {
431 err = val;
432 goto error;
433 }
434 revision[i] = val;
435 }
436 pr_info("Found %s chip at %#hx, revision: %d.%02d\n", DEVNAME,
437 data->addr, revision[0], revision[1]);
438
439 /* Read all temp + fan ctrl registers to determine which are active */
440 for (i = 0; i < SCH5636_NO_TEMPS; i++) {
441 val = sch56xx_read_virtual_reg(data->addr,
442 SCH5636_REG_TEMP_CTRL(i));
443 if (unlikely(val < 0)) {
444 err = val;
445 goto error;
446 }
447 data->temp_ctrl[i] = val;
448 }
449
450 for (i = 0; i < SCH5636_NO_FANS; i++) {
451 val = sch56xx_read_virtual_reg(data->addr,
452 SCH5636_REG_FAN_CTRL(i));
453 if (unlikely(val < 0)) {
454 err = val;
455 goto error;
456 }
457 data->fan_ctrl[i] = val;
458 }
459
460 for (i = 0; i < ARRAY_SIZE(sch5636_attr); i++) {
461 err = device_create_file(&pdev->dev,
462 &sch5636_attr[i].dev_attr);
463 if (err)
464 goto error;
465 }
466
467 for (i = 0; i < (SCH5636_NO_TEMPS * 3); i++) {
468 if (data->temp_ctrl[i/3] & SCH5636_TEMP_DEACTIVATED)
469 continue;
470
471 err = device_create_file(&pdev->dev,
472 &sch5636_temp_attr[i].dev_attr);
473 if (err)
474 goto error;
475 }
476
477 for (i = 0; i < (SCH5636_NO_FANS * 3); i++) {
478 if (data->fan_ctrl[i/3] & SCH5636_FAN_DEACTIVATED)
479 continue;
480
481 err = device_create_file(&pdev->dev,
482 &sch5636_fan_attr[i].dev_attr);
483 if (err)
484 goto error;
485 }
486
487 data->hwmon_dev = hwmon_device_register(&pdev->dev);
488 if (IS_ERR(data->hwmon_dev)) {
489 err = PTR_ERR(data->hwmon_dev);
490 data->hwmon_dev = NULL;
491 goto error;
492 }
493
494 /* Note failing to register the watchdog is not a fatal error */
495 sch56xx_watchdog_register(&pdev->dev, data->addr, (revision[0] << 8) | revision[1],
496 &data->update_lock, 0);
497
498 return 0;
499
500 error:
501 sch5636_remove(pdev);
502 return err;
503 }
504
505 static const struct platform_device_id sch5636_device_id[] = {
506 {
507 .name = "sch5636",
508 },
509 { }
510 };
511 MODULE_DEVICE_TABLE(platform, sch5636_device_id);
512
513 static struct platform_driver sch5636_driver = {
514 .driver = {
515 .name = DRVNAME,
516 },
517 .probe = sch5636_probe,
518 .remove = sch5636_remove,
519 .id_table = sch5636_device_id,
520 };
521
522 module_platform_driver(sch5636_driver);
523
524 MODULE_DESCRIPTION("SMSC SCH5636 Hardware Monitoring Driver");
525 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
526 MODULE_LICENSE("GPL");
527