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24c1aa85 NG |
1 | /* |
2 | * IBM PowerNV platform sensors for temperature/fan/voltage/power | |
3 | * Copyright (C) 2014 IBM | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. | |
17 | */ | |
18 | ||
19 | #define DRVNAME "ibmpowernv" | |
20 | #define pr_fmt(fmt) DRVNAME ": " fmt | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/hwmon.h> | |
26 | #include <linux/hwmon-sysfs.h> | |
27 | #include <linux/of.h> | |
28 | #include <linux/slab.h> | |
29 | ||
30 | #include <linux/platform_device.h> | |
31 | #include <asm/opal.h> | |
32 | #include <linux/err.h> | |
3df2f59f | 33 | #include <asm/cputhreads.h> |
8416915c | 34 | #include <asm/smp.h> |
24c1aa85 NG |
35 | |
36 | #define MAX_ATTR_LEN 32 | |
2bcd3787 | 37 | #define MAX_LABEL_LEN 64 |
24c1aa85 NG |
38 | |
39 | /* Sensor suffix name from DT */ | |
40 | #define DT_FAULT_ATTR_SUFFIX "faulted" | |
41 | #define DT_DATA_ATTR_SUFFIX "data" | |
42 | #define DT_THRESHOLD_ATTR_SUFFIX "thrs" | |
43 | ||
44 | /* | |
45 | * Enumerates all the types of sensors in the POWERNV platform and does index | |
46 | * into 'struct sensor_group' | |
47 | */ | |
48 | enum sensors { | |
49 | FAN, | |
96124610 | 50 | TEMP, |
24c1aa85 NG |
51 | POWER_SUPPLY, |
52 | POWER_INPUT, | |
53 | MAX_SENSOR_TYPE, | |
54 | }; | |
55 | ||
14681637 CLG |
56 | #define INVALID_INDEX (-1U) |
57 | ||
24c1aa85 NG |
58 | static struct sensor_group { |
59 | const char *name; | |
60 | const char *compatible; | |
61 | struct attribute_group group; | |
62 | u32 attr_count; | |
fcaf57b6 | 63 | u32 hwmon_index; |
24c1aa85 NG |
64 | } sensor_groups[] = { |
65 | {"fan", "ibm,opal-sensor-cooling-fan"}, | |
66 | {"temp", "ibm,opal-sensor-amb-temp"}, | |
67 | {"in", "ibm,opal-sensor-power-supply"}, | |
68 | {"power", "ibm,opal-sensor-power"} | |
69 | }; | |
70 | ||
71 | struct sensor_data { | |
72 | u32 id; /* An opaque id of the firmware for each sensor */ | |
fcaf57b6 CLG |
73 | u32 hwmon_index; |
74 | u32 opal_index; | |
24c1aa85 | 75 | enum sensors type; |
2bcd3787 | 76 | char label[MAX_LABEL_LEN]; |
24c1aa85 NG |
77 | char name[MAX_ATTR_LEN]; |
78 | struct device_attribute dev_attr; | |
79 | }; | |
80 | ||
81 | struct platform_data { | |
82 | const struct attribute_group *attr_groups[MAX_SENSOR_TYPE + 1]; | |
83 | u32 sensors_count; /* Total count of sensors from each group */ | |
84 | }; | |
85 | ||
24c1aa85 NG |
86 | static ssize_t show_sensor(struct device *dev, struct device_attribute *devattr, |
87 | char *buf) | |
88 | { | |
89 | struct sensor_data *sdata = container_of(devattr, struct sensor_data, | |
90 | dev_attr); | |
91 | ssize_t ret; | |
92 | u32 x; | |
93 | ||
94 | ret = opal_get_sensor_data(sdata->id, &x); | |
95 | if (ret) | |
96 | return ret; | |
97 | ||
98 | /* Convert temperature to milli-degrees */ | |
96124610 | 99 | if (sdata->type == TEMP) |
24c1aa85 NG |
100 | x *= 1000; |
101 | /* Convert power to micro-watts */ | |
102 | else if (sdata->type == POWER_INPUT) | |
103 | x *= 1000000; | |
104 | ||
105 | return sprintf(buf, "%u\n", x); | |
106 | } | |
107 | ||
2bcd3787 CLG |
108 | static ssize_t show_label(struct device *dev, struct device_attribute *devattr, |
109 | char *buf) | |
110 | { | |
111 | struct sensor_data *sdata = container_of(devattr, struct sensor_data, | |
112 | dev_attr); | |
113 | ||
114 | return sprintf(buf, "%s\n", sdata->label); | |
115 | } | |
116 | ||
3df2f59f CLG |
117 | static int __init get_logical_cpu(int hwcpu) |
118 | { | |
119 | int cpu; | |
120 | ||
121 | for_each_possible_cpu(cpu) | |
122 | if (get_hard_smp_processor_id(cpu) == hwcpu) | |
123 | return cpu; | |
124 | ||
125 | return -ENOENT; | |
126 | } | |
127 | ||
2bcd3787 CLG |
128 | static void __init make_sensor_label(struct device_node *np, |
129 | struct sensor_data *sdata, | |
130 | const char *label) | |
131 | { | |
3df2f59f | 132 | u32 id; |
2bcd3787 CLG |
133 | size_t n; |
134 | ||
135 | n = snprintf(sdata->label, sizeof(sdata->label), "%s", label); | |
3df2f59f CLG |
136 | |
137 | /* | |
138 | * Core temp pretty print | |
139 | */ | |
140 | if (!of_property_read_u32(np, "ibm,pir", &id)) { | |
141 | int cpuid = get_logical_cpu(id); | |
142 | ||
143 | if (cpuid >= 0) | |
144 | /* | |
145 | * The digital thermal sensors are associated | |
acf32964 | 146 | * with a core. |
3df2f59f CLG |
147 | */ |
148 | n += snprintf(sdata->label + n, | |
acf32964 MN |
149 | sizeof(sdata->label) - n, " %d", |
150 | cpuid); | |
3df2f59f CLG |
151 | else |
152 | n += snprintf(sdata->label + n, | |
153 | sizeof(sdata->label) - n, " phy%d", id); | |
154 | } | |
155 | ||
156 | /* | |
157 | * Membuffer pretty print | |
158 | */ | |
159 | if (!of_property_read_u32(np, "ibm,chip-id", &id)) | |
160 | n += snprintf(sdata->label + n, sizeof(sdata->label) - n, | |
161 | " %d", id & 0xffff); | |
2bcd3787 CLG |
162 | } |
163 | ||
164 | static int get_sensor_index_attr(const char *name, u32 *index, char *attr) | |
24c1aa85 NG |
165 | { |
166 | char *hash_pos = strchr(name, '#'); | |
167 | char buf[8] = { 0 }; | |
168 | char *dash_pos; | |
169 | u32 copy_len; | |
170 | int err; | |
171 | ||
172 | if (!hash_pos) | |
173 | return -EINVAL; | |
174 | ||
175 | dash_pos = strchr(hash_pos, '-'); | |
176 | if (!dash_pos) | |
177 | return -EINVAL; | |
178 | ||
179 | copy_len = dash_pos - hash_pos - 1; | |
180 | if (copy_len >= sizeof(buf)) | |
181 | return -EINVAL; | |
182 | ||
183 | strncpy(buf, hash_pos + 1, copy_len); | |
184 | ||
185 | err = kstrtou32(buf, 10, index); | |
186 | if (err) | |
187 | return err; | |
188 | ||
189 | strncpy(attr, dash_pos + 1, MAX_ATTR_LEN); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
ccc9ac6c CLG |
194 | static const char *convert_opal_attr_name(enum sensors type, |
195 | const char *opal_attr) | |
196 | { | |
197 | const char *attr_name = NULL; | |
198 | ||
199 | if (!strcmp(opal_attr, DT_FAULT_ATTR_SUFFIX)) { | |
200 | attr_name = "fault"; | |
201 | } else if (!strcmp(opal_attr, DT_DATA_ATTR_SUFFIX)) { | |
202 | attr_name = "input"; | |
203 | } else if (!strcmp(opal_attr, DT_THRESHOLD_ATTR_SUFFIX)) { | |
204 | if (type == TEMP) | |
205 | attr_name = "max"; | |
206 | else if (type == FAN) | |
207 | attr_name = "min"; | |
208 | } | |
209 | ||
210 | return attr_name; | |
211 | } | |
212 | ||
24c1aa85 NG |
213 | /* |
214 | * This function translates the DT node name into the 'hwmon' attribute name. | |
215 | * IBMPOWERNV device node appear like cooling-fan#2-data, amb-temp#1-thrs etc. | |
216 | * which need to be mapped as fan2_input, temp1_max respectively before | |
217 | * populating them inside hwmon device class. | |
218 | */ | |
f9f54f16 CLG |
219 | static const char *parse_opal_node_name(const char *node_name, |
220 | enum sensors type, u32 *index) | |
24c1aa85 NG |
221 | { |
222 | char attr_suffix[MAX_ATTR_LEN]; | |
ccc9ac6c | 223 | const char *attr_name; |
24c1aa85 NG |
224 | int err; |
225 | ||
f9f54f16 CLG |
226 | err = get_sensor_index_attr(node_name, index, attr_suffix); |
227 | if (err) | |
228 | return ERR_PTR(err); | |
24c1aa85 | 229 | |
ccc9ac6c CLG |
230 | attr_name = convert_opal_attr_name(type, attr_suffix); |
231 | if (!attr_name) | |
f9f54f16 | 232 | return ERR_PTR(-ENOENT); |
24c1aa85 | 233 | |
f9f54f16 | 234 | return attr_name; |
24c1aa85 NG |
235 | } |
236 | ||
c4ad4720 CLG |
237 | static int get_sensor_type(struct device_node *np) |
238 | { | |
239 | enum sensors type; | |
14681637 | 240 | const char *str; |
c4ad4720 CLG |
241 | |
242 | for (type = 0; type < MAX_SENSOR_TYPE; type++) { | |
243 | if (of_device_is_compatible(np, sensor_groups[type].compatible)) | |
244 | return type; | |
245 | } | |
14681637 CLG |
246 | |
247 | /* | |
248 | * Let's check if we have a newer device tree | |
249 | */ | |
250 | if (!of_device_is_compatible(np, "ibm,opal-sensor")) | |
251 | return MAX_SENSOR_TYPE; | |
252 | ||
253 | if (of_property_read_string(np, "sensor-type", &str)) | |
254 | return MAX_SENSOR_TYPE; | |
255 | ||
256 | for (type = 0; type < MAX_SENSOR_TYPE; type++) | |
257 | if (!strcmp(str, sensor_groups[type].name)) | |
258 | return type; | |
259 | ||
c4ad4720 CLG |
260 | return MAX_SENSOR_TYPE; |
261 | } | |
262 | ||
fcaf57b6 CLG |
263 | static u32 get_sensor_hwmon_index(struct sensor_data *sdata, |
264 | struct sensor_data *sdata_table, int count) | |
265 | { | |
266 | int i; | |
267 | ||
14681637 CLG |
268 | /* |
269 | * We don't use the OPAL index on newer device trees | |
270 | */ | |
271 | if (sdata->opal_index != INVALID_INDEX) { | |
272 | for (i = 0; i < count; i++) | |
273 | if (sdata_table[i].opal_index == sdata->opal_index && | |
274 | sdata_table[i].type == sdata->type) | |
275 | return sdata_table[i].hwmon_index; | |
276 | } | |
fcaf57b6 CLG |
277 | return ++sensor_groups[sdata->type].hwmon_index; |
278 | } | |
279 | ||
8de303ba | 280 | static int populate_attr_groups(struct platform_device *pdev) |
24c1aa85 NG |
281 | { |
282 | struct platform_data *pdata = platform_get_drvdata(pdev); | |
283 | const struct attribute_group **pgroups = pdata->attr_groups; | |
284 | struct device_node *opal, *np; | |
285 | enum sensors type; | |
286 | ||
287 | opal = of_find_node_by_path("/ibm,opal/sensors"); | |
24c1aa85 | 288 | for_each_child_of_node(opal, np) { |
2bcd3787 CLG |
289 | const char *label; |
290 | ||
24c1aa85 NG |
291 | if (np->name == NULL) |
292 | continue; | |
293 | ||
c4ad4720 | 294 | type = get_sensor_type(np); |
2bcd3787 CLG |
295 | if (type == MAX_SENSOR_TYPE) |
296 | continue; | |
297 | ||
298 | sensor_groups[type].attr_count++; | |
299 | ||
300 | /* | |
301 | * add a new attribute for labels | |
302 | */ | |
303 | if (!of_property_read_string(np, "label", &label)) | |
c4ad4720 | 304 | sensor_groups[type].attr_count++; |
24c1aa85 NG |
305 | } |
306 | ||
307 | of_node_put(opal); | |
308 | ||
309 | for (type = 0; type < MAX_SENSOR_TYPE; type++) { | |
310 | sensor_groups[type].group.attrs = devm_kzalloc(&pdev->dev, | |
311 | sizeof(struct attribute *) * | |
312 | (sensor_groups[type].attr_count + 1), | |
313 | GFP_KERNEL); | |
314 | if (!sensor_groups[type].group.attrs) | |
315 | return -ENOMEM; | |
316 | ||
317 | pgroups[type] = &sensor_groups[type].group; | |
318 | pdata->sensors_count += sensor_groups[type].attr_count; | |
319 | sensor_groups[type].attr_count = 0; | |
320 | } | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
9e4f74b1 CLG |
325 | static void create_hwmon_attr(struct sensor_data *sdata, const char *attr_name, |
326 | ssize_t (*show)(struct device *dev, | |
327 | struct device_attribute *attr, | |
328 | char *buf)) | |
329 | { | |
330 | snprintf(sdata->name, MAX_ATTR_LEN, "%s%d_%s", | |
331 | sensor_groups[sdata->type].name, sdata->hwmon_index, | |
332 | attr_name); | |
333 | ||
334 | sysfs_attr_init(&sdata->dev_attr.attr); | |
335 | sdata->dev_attr.attr.name = sdata->name; | |
336 | sdata->dev_attr.attr.mode = S_IRUGO; | |
337 | sdata->dev_attr.show = show; | |
338 | } | |
339 | ||
24c1aa85 NG |
340 | /* |
341 | * Iterate through the device tree for each child of 'sensors' node, create | |
342 | * a sysfs attribute file, the file is named by translating the DT node name | |
343 | * to the name required by the higher 'hwmon' driver like fan1_input, temp1_max | |
344 | * etc.. | |
345 | */ | |
8de303ba | 346 | static int create_device_attrs(struct platform_device *pdev) |
24c1aa85 NG |
347 | { |
348 | struct platform_data *pdata = platform_get_drvdata(pdev); | |
349 | const struct attribute_group **pgroups = pdata->attr_groups; | |
350 | struct device_node *opal, *np; | |
351 | struct sensor_data *sdata; | |
18d03f3c | 352 | u32 sensor_id; |
24c1aa85 NG |
353 | enum sensors type; |
354 | u32 count = 0; | |
355 | int err = 0; | |
356 | ||
357 | opal = of_find_node_by_path("/ibm,opal/sensors"); | |
358 | sdata = devm_kzalloc(&pdev->dev, pdata->sensors_count * sizeof(*sdata), | |
359 | GFP_KERNEL); | |
360 | if (!sdata) { | |
361 | err = -ENOMEM; | |
362 | goto exit_put_node; | |
363 | } | |
364 | ||
365 | for_each_child_of_node(opal, np) { | |
f9f54f16 CLG |
366 | const char *attr_name; |
367 | u32 opal_index; | |
2bcd3787 | 368 | const char *label; |
f9f54f16 | 369 | |
24c1aa85 NG |
370 | if (np->name == NULL) |
371 | continue; | |
372 | ||
c4ad4720 | 373 | type = get_sensor_type(np); |
24c1aa85 NG |
374 | if (type == MAX_SENSOR_TYPE) |
375 | continue; | |
376 | ||
14681637 CLG |
377 | /* |
378 | * Newer device trees use a "sensor-data" property | |
379 | * name for input. | |
380 | */ | |
381 | if (of_property_read_u32(np, "sensor-id", &sensor_id) && | |
382 | of_property_read_u32(np, "sensor-data", &sensor_id)) { | |
24c1aa85 NG |
383 | dev_info(&pdev->dev, |
384 | "'sensor-id' missing in the node '%s'\n", | |
385 | np->name); | |
386 | continue; | |
387 | } | |
388 | ||
18d03f3c | 389 | sdata[count].id = sensor_id; |
24c1aa85 | 390 | sdata[count].type = type; |
f9f54f16 | 391 | |
14681637 CLG |
392 | /* |
393 | * If we can not parse the node name, it means we are | |
394 | * running on a newer device tree. We can just forget | |
395 | * about the OPAL index and use a defaut value for the | |
396 | * hwmon attribute name | |
397 | */ | |
f9f54f16 CLG |
398 | attr_name = parse_opal_node_name(np->name, type, &opal_index); |
399 | if (IS_ERR(attr_name)) { | |
14681637 CLG |
400 | attr_name = "input"; |
401 | opal_index = INVALID_INDEX; | |
f9f54f16 CLG |
402 | } |
403 | ||
fcaf57b6 CLG |
404 | sdata[count].opal_index = opal_index; |
405 | sdata[count].hwmon_index = | |
406 | get_sensor_hwmon_index(&sdata[count], sdata, count); | |
407 | ||
9e4f74b1 | 408 | create_hwmon_attr(&sdata[count], attr_name, show_sensor); |
24c1aa85 NG |
409 | |
410 | pgroups[type]->attrs[sensor_groups[type].attr_count++] = | |
411 | &sdata[count++].dev_attr.attr; | |
2bcd3787 CLG |
412 | |
413 | if (!of_property_read_string(np, "label", &label)) { | |
414 | /* | |
415 | * For the label attribute, we can reuse the | |
416 | * "properties" of the previous "input" | |
417 | * attribute. They are related to the same | |
418 | * sensor. | |
419 | */ | |
420 | sdata[count].type = type; | |
421 | sdata[count].opal_index = sdata[count - 1].opal_index; | |
422 | sdata[count].hwmon_index = sdata[count - 1].hwmon_index; | |
423 | ||
424 | make_sensor_label(np, &sdata[count], label); | |
425 | ||
426 | create_hwmon_attr(&sdata[count], "label", show_label); | |
427 | ||
428 | pgroups[type]->attrs[sensor_groups[type].attr_count++] = | |
429 | &sdata[count++].dev_attr.attr; | |
430 | } | |
24c1aa85 NG |
431 | } |
432 | ||
433 | exit_put_node: | |
434 | of_node_put(opal); | |
435 | return err; | |
436 | } | |
437 | ||
8de303ba | 438 | static int ibmpowernv_probe(struct platform_device *pdev) |
24c1aa85 NG |
439 | { |
440 | struct platform_data *pdata; | |
441 | struct device *hwmon_dev; | |
442 | int err; | |
443 | ||
444 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
445 | if (!pdata) | |
446 | return -ENOMEM; | |
447 | ||
448 | platform_set_drvdata(pdev, pdata); | |
449 | pdata->sensors_count = 0; | |
450 | err = populate_attr_groups(pdev); | |
451 | if (err) | |
452 | return err; | |
453 | ||
454 | /* Create sysfs attribute data for each sensor found in the DT */ | |
455 | err = create_device_attrs(pdev); | |
456 | if (err) | |
457 | return err; | |
458 | ||
459 | /* Finally, register with hwmon */ | |
460 | hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, DRVNAME, | |
461 | pdata, | |
462 | pdata->attr_groups); | |
463 | ||
464 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
465 | } | |
466 | ||
8de303ba NG |
467 | static const struct platform_device_id opal_sensor_driver_ids[] = { |
468 | { | |
469 | .name = "opal-sensor", | |
470 | }, | |
471 | { } | |
472 | }; | |
473 | MODULE_DEVICE_TABLE(platform, opal_sensor_driver_ids); | |
474 | ||
0b056b29 CLG |
475 | static const struct of_device_id opal_sensor_match[] = { |
476 | { .compatible = "ibm,opal-sensor" }, | |
477 | { }, | |
478 | }; | |
479 | MODULE_DEVICE_TABLE(of, opal_sensor_match); | |
480 | ||
24c1aa85 | 481 | static struct platform_driver ibmpowernv_driver = { |
8de303ba NG |
482 | .probe = ibmpowernv_probe, |
483 | .id_table = opal_sensor_driver_ids, | |
484 | .driver = { | |
8de303ba | 485 | .name = DRVNAME, |
0b056b29 | 486 | .of_match_table = opal_sensor_match, |
24c1aa85 NG |
487 | }, |
488 | }; | |
489 | ||
3bdec670 | 490 | module_platform_driver(ibmpowernv_driver); |
24c1aa85 NG |
491 | |
492 | MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>"); | |
493 | MODULE_DESCRIPTION("IBM POWERNV platform sensors"); | |
494 | MODULE_LICENSE("GPL"); |