2 * IBM PowerNV platform sensors for temperature/fan/voltage/power
3 * Copyright (C) 2014 IBM
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.
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.
15 * You should have received a copy of the GNU General Public License
16 * along with this program.
19 #define DRVNAME "ibmpowernv"
20 #define pr_fmt(fmt) DRVNAME ": " fmt
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>
28 #include <linux/slab.h>
30 #include <linux/platform_device.h>
32 #include <linux/err.h>
33 #include <asm/cputhreads.h>
36 #define MAX_ATTR_LEN 32
37 #define MAX_LABEL_LEN 64
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"
45 * Enumerates all the types of sensors in the POWERNV platform and does index
46 * into 'struct sensor_group'
56 #define INVALID_INDEX (-1U)
58 static struct sensor_group {
60 const char *compatible;
61 struct attribute_group group;
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"}
72 u32 id; /* An opaque id of the firmware for each sensor */
76 char label[MAX_LABEL_LEN];
77 char name[MAX_ATTR_LEN];
78 struct device_attribute dev_attr;
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 */
86 static ssize_t show_sensor(struct device *dev, struct device_attribute *devattr,
89 struct sensor_data *sdata = container_of(devattr, struct sensor_data,
94 ret = opal_get_sensor_data(sdata->id, &x);
98 /* Convert temperature to milli-degrees */
99 if (sdata->type == TEMP)
101 /* Convert power to micro-watts */
102 else if (sdata->type == POWER_INPUT)
105 return sprintf(buf, "%u\n", x);
108 static ssize_t show_label(struct device *dev, struct device_attribute *devattr,
111 struct sensor_data *sdata = container_of(devattr, struct sensor_data,
114 return sprintf(buf, "%s\n", sdata->label);
117 static int get_logical_cpu(int hwcpu)
121 for_each_possible_cpu(cpu)
122 if (get_hard_smp_processor_id(cpu) == hwcpu)
128 static void make_sensor_label(struct device_node *np,
129 struct sensor_data *sdata, const char *label)
134 n = snprintf(sdata->label, sizeof(sdata->label), "%s", label);
137 * Core temp pretty print
139 if (!of_property_read_u32(np, "ibm,pir", &id)) {
140 int cpuid = get_logical_cpu(id);
144 * The digital thermal sensors are associated
145 * with a core. Let's print out the range of
146 * cpu ids corresponding to the hardware
147 * threads of the core.
149 n += snprintf(sdata->label + n,
150 sizeof(sdata->label) - n, " %d-%d",
151 cpuid, cpuid + threads_per_core - 1);
153 n += snprintf(sdata->label + n,
154 sizeof(sdata->label) - n, " phy%d", id);
158 * Membuffer pretty print
160 if (!of_property_read_u32(np, "ibm,chip-id", &id))
161 n += snprintf(sdata->label + n, sizeof(sdata->label) - n,
165 static int get_sensor_index_attr(const char *name, u32 *index, char *attr)
167 char *hash_pos = strchr(name, '#');
176 dash_pos = strchr(hash_pos, '-');
180 copy_len = dash_pos - hash_pos - 1;
181 if (copy_len >= sizeof(buf))
184 strncpy(buf, hash_pos + 1, copy_len);
186 err = kstrtou32(buf, 10, index);
190 strncpy(attr, dash_pos + 1, MAX_ATTR_LEN);
195 static const char *convert_opal_attr_name(enum sensors type,
196 const char *opal_attr)
198 const char *attr_name = NULL;
200 if (!strcmp(opal_attr, DT_FAULT_ATTR_SUFFIX)) {
202 } else if (!strcmp(opal_attr, DT_DATA_ATTR_SUFFIX)) {
204 } else if (!strcmp(opal_attr, DT_THRESHOLD_ATTR_SUFFIX)) {
207 else if (type == FAN)
215 * This function translates the DT node name into the 'hwmon' attribute name.
216 * IBMPOWERNV device node appear like cooling-fan#2-data, amb-temp#1-thrs etc.
217 * which need to be mapped as fan2_input, temp1_max respectively before
218 * populating them inside hwmon device class.
220 static const char *parse_opal_node_name(const char *node_name,
221 enum sensors type, u32 *index)
223 char attr_suffix[MAX_ATTR_LEN];
224 const char *attr_name;
227 err = get_sensor_index_attr(node_name, index, attr_suffix);
231 attr_name = convert_opal_attr_name(type, attr_suffix);
233 return ERR_PTR(-ENOENT);
238 static int get_sensor_type(struct device_node *np)
243 for (type = 0; type < MAX_SENSOR_TYPE; type++) {
244 if (of_device_is_compatible(np, sensor_groups[type].compatible))
249 * Let's check if we have a newer device tree
251 if (!of_device_is_compatible(np, "ibm,opal-sensor"))
252 return MAX_SENSOR_TYPE;
254 if (of_property_read_string(np, "sensor-type", &str))
255 return MAX_SENSOR_TYPE;
257 for (type = 0; type < MAX_SENSOR_TYPE; type++)
258 if (!strcmp(str, sensor_groups[type].name))
261 return MAX_SENSOR_TYPE;
264 static u32 get_sensor_hwmon_index(struct sensor_data *sdata,
265 struct sensor_data *sdata_table, int count)
270 * We don't use the OPAL index on newer device trees
272 if (sdata->opal_index != INVALID_INDEX) {
273 for (i = 0; i < count; i++)
274 if (sdata_table[i].opal_index == sdata->opal_index &&
275 sdata_table[i].type == sdata->type)
276 return sdata_table[i].hwmon_index;
278 return ++sensor_groups[sdata->type].hwmon_index;
281 static int populate_attr_groups(struct platform_device *pdev)
283 struct platform_data *pdata = platform_get_drvdata(pdev);
284 const struct attribute_group **pgroups = pdata->attr_groups;
285 struct device_node *opal, *np;
288 opal = of_find_node_by_path("/ibm,opal/sensors");
289 for_each_child_of_node(opal, np) {
292 if (np->name == NULL)
295 type = get_sensor_type(np);
296 if (type == MAX_SENSOR_TYPE)
299 sensor_groups[type].attr_count++;
302 * add a new attribute for labels
304 if (!of_property_read_string(np, "label", &label))
305 sensor_groups[type].attr_count++;
310 for (type = 0; type < MAX_SENSOR_TYPE; type++) {
311 sensor_groups[type].group.attrs = devm_kzalloc(&pdev->dev,
312 sizeof(struct attribute *) *
313 (sensor_groups[type].attr_count + 1),
315 if (!sensor_groups[type].group.attrs)
318 pgroups[type] = &sensor_groups[type].group;
319 pdata->sensors_count += sensor_groups[type].attr_count;
320 sensor_groups[type].attr_count = 0;
326 static void create_hwmon_attr(struct sensor_data *sdata, const char *attr_name,
327 ssize_t (*show)(struct device *dev,
328 struct device_attribute *attr,
331 snprintf(sdata->name, MAX_ATTR_LEN, "%s%d_%s",
332 sensor_groups[sdata->type].name, sdata->hwmon_index,
335 sysfs_attr_init(&sdata->dev_attr.attr);
336 sdata->dev_attr.attr.name = sdata->name;
337 sdata->dev_attr.attr.mode = S_IRUGO;
338 sdata->dev_attr.show = show;
342 * Iterate through the device tree for each child of 'sensors' node, create
343 * a sysfs attribute file, the file is named by translating the DT node name
344 * to the name required by the higher 'hwmon' driver like fan1_input, temp1_max
347 static int create_device_attrs(struct platform_device *pdev)
349 struct platform_data *pdata = platform_get_drvdata(pdev);
350 const struct attribute_group **pgroups = pdata->attr_groups;
351 struct device_node *opal, *np;
352 struct sensor_data *sdata;
358 opal = of_find_node_by_path("/ibm,opal/sensors");
359 sdata = devm_kzalloc(&pdev->dev, pdata->sensors_count * sizeof(*sdata),
366 for_each_child_of_node(opal, np) {
367 const char *attr_name;
371 if (np->name == NULL)
374 type = get_sensor_type(np);
375 if (type == MAX_SENSOR_TYPE)
379 * Newer device trees use a "sensor-data" property
382 if (of_property_read_u32(np, "sensor-id", &sensor_id) &&
383 of_property_read_u32(np, "sensor-data", &sensor_id)) {
385 "'sensor-id' missing in the node '%s'\n",
390 sdata[count].id = sensor_id;
391 sdata[count].type = type;
394 * If we can not parse the node name, it means we are
395 * running on a newer device tree. We can just forget
396 * about the OPAL index and use a defaut value for the
397 * hwmon attribute name
399 attr_name = parse_opal_node_name(np->name, type, &opal_index);
400 if (IS_ERR(attr_name)) {
402 opal_index = INVALID_INDEX;
405 sdata[count].opal_index = opal_index;
406 sdata[count].hwmon_index =
407 get_sensor_hwmon_index(&sdata[count], sdata, count);
409 create_hwmon_attr(&sdata[count], attr_name, show_sensor);
411 pgroups[type]->attrs[sensor_groups[type].attr_count++] =
412 &sdata[count++].dev_attr.attr;
414 if (!of_property_read_string(np, "label", &label)) {
416 * For the label attribute, we can reuse the
417 * "properties" of the previous "input"
418 * attribute. They are related to the same
421 sdata[count].type = type;
422 sdata[count].opal_index = sdata[count - 1].opal_index;
423 sdata[count].hwmon_index = sdata[count - 1].hwmon_index;
425 make_sensor_label(np, &sdata[count], label);
427 create_hwmon_attr(&sdata[count], "label", show_label);
429 pgroups[type]->attrs[sensor_groups[type].attr_count++] =
430 &sdata[count++].dev_attr.attr;
439 static int ibmpowernv_probe(struct platform_device *pdev)
441 struct platform_data *pdata;
442 struct device *hwmon_dev;
445 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
449 platform_set_drvdata(pdev, pdata);
450 pdata->sensors_count = 0;
451 err = populate_attr_groups(pdev);
455 /* Create sysfs attribute data for each sensor found in the DT */
456 err = create_device_attrs(pdev);
460 /* Finally, register with hwmon */
461 hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, DRVNAME,
465 return PTR_ERR_OR_ZERO(hwmon_dev);
468 static const struct platform_device_id opal_sensor_driver_ids[] = {
470 .name = "opal-sensor",
474 MODULE_DEVICE_TABLE(platform, opal_sensor_driver_ids);
476 static const struct of_device_id opal_sensor_match[] = {
477 { .compatible = "ibm,opal-sensor" },
480 MODULE_DEVICE_TABLE(of, opal_sensor_match);
482 static struct platform_driver ibmpowernv_driver = {
483 .probe = ibmpowernv_probe,
484 .id_table = opal_sensor_driver_ids,
487 .of_match_table = opal_sensor_match,
491 module_platform_driver(ibmpowernv_driver);
493 MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
494 MODULE_DESCRIPTION("IBM POWERNV platform sensors");
495 MODULE_LICENSE("GPL");