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