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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring4 *5 * This file defines the sysfs class "hwmon", for use by sensors drivers.6 *7 * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>8 */9 10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt11 12#include <linux/bitops.h>13#include <linux/device.h>14#include <linux/err.h>15#include <linux/gfp.h>16#include <linux/hwmon.h>17#include <linux/i2c.h>18#include <linux/idr.h>19#include <linux/kstrtox.h>20#include <linux/list.h>21#include <linux/module.h>22#include <linux/pci.h>23#include <linux/property.h>24#include <linux/slab.h>25#include <linux/string.h>26#include <linux/thermal.h>27 28#define CREATE_TRACE_POINTS29#include <trace/events/hwmon.h>30 31#define HWMON_ID_PREFIX "hwmon"32#define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"33 34struct hwmon_device {35 const char *name;36 const char *label;37 struct device dev;38 const struct hwmon_chip_info *chip;39 struct list_head tzdata;40 struct attribute_group group;41 const struct attribute_group **groups;42};43 44#define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)45 46#define MAX_SYSFS_ATTR_NAME_LENGTH 3247 48struct hwmon_device_attribute {49 struct device_attribute dev_attr;50 const struct hwmon_ops *ops;51 enum hwmon_sensor_types type;52 u32 attr;53 int index;54 char name[MAX_SYSFS_ATTR_NAME_LENGTH];55};56 57#define to_hwmon_attr(d) \58 container_of(d, struct hwmon_device_attribute, dev_attr)59#define to_dev_attr(a) container_of(a, struct device_attribute, attr)60 61/*62 * Thermal zone information63 */64struct hwmon_thermal_data {65 struct list_head node; /* hwmon tzdata list entry */66 struct device *dev; /* Reference to hwmon device */67 int index; /* sensor index */68 struct thermal_zone_device *tzd;/* thermal zone device */69};70 71static ssize_t72name_show(struct device *dev, struct device_attribute *attr, char *buf)73{74 return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);75}76static DEVICE_ATTR_RO(name);77 78static ssize_t79label_show(struct device *dev, struct device_attribute *attr, char *buf)80{81 return sysfs_emit(buf, "%s\n", to_hwmon_device(dev)->label);82}83static DEVICE_ATTR_RO(label);84 85static struct attribute *hwmon_dev_attrs[] = {86 &dev_attr_name.attr,87 &dev_attr_label.attr,88 NULL89};90 91static umode_t hwmon_dev_attr_is_visible(struct kobject *kobj,92 struct attribute *attr, int n)93{94 struct device *dev = kobj_to_dev(kobj);95 struct hwmon_device *hdev = to_hwmon_device(dev);96 97 if (attr == &dev_attr_name.attr && hdev->name == NULL)98 return 0;99 100 if (attr == &dev_attr_label.attr && hdev->label == NULL)101 return 0;102 103 return attr->mode;104}105 106static const struct attribute_group hwmon_dev_attr_group = {107 .attrs = hwmon_dev_attrs,108 .is_visible = hwmon_dev_attr_is_visible,109};110 111static const struct attribute_group *hwmon_dev_attr_groups[] = {112 &hwmon_dev_attr_group,113 NULL114};115 116static void hwmon_free_attrs(struct attribute **attrs)117{118 int i;119 120 for (i = 0; attrs[i]; i++) {121 struct device_attribute *dattr = to_dev_attr(attrs[i]);122 struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);123 124 kfree(hattr);125 }126 kfree(attrs);127}128 129static void hwmon_dev_release(struct device *dev)130{131 struct hwmon_device *hwdev = to_hwmon_device(dev);132 133 if (hwdev->group.attrs)134 hwmon_free_attrs(hwdev->group.attrs);135 kfree(hwdev->groups);136 kfree(hwdev->label);137 kfree(hwdev);138}139 140static const struct class hwmon_class = {141 .name = "hwmon",142 .dev_groups = hwmon_dev_attr_groups,143 .dev_release = hwmon_dev_release,144};145 146static DEFINE_IDA(hwmon_ida);147 148/* Thermal zone handling */149 150/*151 * The complex conditional is necessary to avoid a cyclic dependency152 * between hwmon and thermal_sys modules.153 */154#ifdef CONFIG_THERMAL_OF155static int hwmon_thermal_get_temp(struct thermal_zone_device *tz, int *temp)156{157 struct hwmon_thermal_data *tdata = thermal_zone_device_priv(tz);158 struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);159 int ret;160 long t;161 162 ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,163 tdata->index, &t);164 if (ret < 0)165 return ret;166 167 *temp = t;168 169 return 0;170}171 172static int hwmon_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)173{174 struct hwmon_thermal_data *tdata = thermal_zone_device_priv(tz);175 struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);176 const struct hwmon_chip_info *chip = hwdev->chip;177 const struct hwmon_channel_info * const *info = chip->info;178 unsigned int i;179 int err;180 181 if (!chip->ops->write)182 return 0;183 184 for (i = 0; info[i] && info[i]->type != hwmon_temp; i++)185 continue;186 187 if (!info[i])188 return 0;189 190 if (info[i]->config[tdata->index] & HWMON_T_MIN) {191 err = chip->ops->write(tdata->dev, hwmon_temp,192 hwmon_temp_min, tdata->index, low);193 if (err && err != -EOPNOTSUPP)194 return err;195 }196 197 if (info[i]->config[tdata->index] & HWMON_T_MAX) {198 err = chip->ops->write(tdata->dev, hwmon_temp,199 hwmon_temp_max, tdata->index, high);200 if (err && err != -EOPNOTSUPP)201 return err;202 }203 204 return 0;205}206 207static const struct thermal_zone_device_ops hwmon_thermal_ops = {208 .get_temp = hwmon_thermal_get_temp,209 .set_trips = hwmon_thermal_set_trips,210};211 212static void hwmon_thermal_remove_sensor(void *data)213{214 list_del(data);215}216 217static int hwmon_thermal_add_sensor(struct device *dev, int index)218{219 struct hwmon_device *hwdev = to_hwmon_device(dev);220 struct hwmon_thermal_data *tdata;221 struct thermal_zone_device *tzd;222 int err;223 224 tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);225 if (!tdata)226 return -ENOMEM;227 228 tdata->dev = dev;229 tdata->index = index;230 231 tzd = devm_thermal_of_zone_register(dev, index, tdata,232 &hwmon_thermal_ops);233 if (IS_ERR(tzd)) {234 if (PTR_ERR(tzd) != -ENODEV)235 return PTR_ERR(tzd);236 dev_info(dev, "temp%d_input not attached to any thermal zone\n",237 index + 1);238 devm_kfree(dev, tdata);239 return 0;240 }241 242 err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node);243 if (err)244 return err;245 246 tdata->tzd = tzd;247 list_add(&tdata->node, &hwdev->tzdata);248 249 return 0;250}251 252static int hwmon_thermal_register_sensors(struct device *dev)253{254 struct hwmon_device *hwdev = to_hwmon_device(dev);255 const struct hwmon_chip_info *chip = hwdev->chip;256 const struct hwmon_channel_info * const *info = chip->info;257 void *drvdata = dev_get_drvdata(dev);258 int i;259 260 for (i = 1; info[i]; i++) {261 int j;262 263 if (info[i]->type != hwmon_temp)264 continue;265 266 for (j = 0; info[i]->config[j]; j++) {267 int err;268 269 if (!(info[i]->config[j] & HWMON_T_INPUT) ||270 !chip->ops->is_visible(drvdata, hwmon_temp,271 hwmon_temp_input, j))272 continue;273 274 err = hwmon_thermal_add_sensor(dev, j);275 if (err)276 return err;277 }278 }279 280 return 0;281}282 283static void hwmon_thermal_notify(struct device *dev, int index)284{285 struct hwmon_device *hwdev = to_hwmon_device(dev);286 struct hwmon_thermal_data *tzdata;287 288 list_for_each_entry(tzdata, &hwdev->tzdata, node) {289 if (tzdata->index == index) {290 thermal_zone_device_update(tzdata->tzd,291 THERMAL_EVENT_UNSPECIFIED);292 }293 }294}295 296#else297static int hwmon_thermal_register_sensors(struct device *dev)298{299 return 0;300}301 302static void hwmon_thermal_notify(struct device *dev, int index) { }303 304#endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */305 306static int hwmon_attr_base(enum hwmon_sensor_types type)307{308 if (type == hwmon_in || type == hwmon_intrusion)309 return 0;310 return 1;311}312 313#if IS_REACHABLE(CONFIG_I2C)314 315/*316 * PEC support317 *318 * The 'pec' attribute is attached to I2C client devices. It is only provided319 * if the i2c controller supports PEC.320 *321 * The mutex ensures that PEC configuration between i2c device and the hardware322 * is consistent. Use a single mutex because attribute writes are supposed to be323 * rare, and maintaining a separate mutex for each hardware monitoring device324 * would add substantial complexity to the driver for little if any gain.325 *326 * The hardware monitoring device is identified as child of the i2c client327 * device. This assumes that only a single hardware monitoring device is328 * attached to an i2c client device.329 */330 331static DEFINE_MUTEX(hwmon_pec_mutex);332 333static int hwmon_match_device(struct device *dev, void *data)334{335 return dev->class == &hwmon_class;336}337 338static ssize_t pec_show(struct device *dev, struct device_attribute *dummy,339 char *buf)340{341 struct i2c_client *client = to_i2c_client(dev);342 343 return sysfs_emit(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));344}345 346static ssize_t pec_store(struct device *dev, struct device_attribute *devattr,347 const char *buf, size_t count)348{349 struct i2c_client *client = to_i2c_client(dev);350 struct hwmon_device *hwdev;351 struct device *hdev;352 bool val;353 int err;354 355 err = kstrtobool(buf, &val);356 if (err < 0)357 return err;358 359 hdev = device_find_child(dev, NULL, hwmon_match_device);360 if (!hdev)361 return -ENODEV;362 363 mutex_lock(&hwmon_pec_mutex);364 365 /*366 * If there is no write function, we assume that chip specific367 * handling is not required.368 */369 hwdev = to_hwmon_device(hdev);370 if (hwdev->chip->ops->write) {371 err = hwdev->chip->ops->write(hdev, hwmon_chip, hwmon_chip_pec, 0, val);372 if (err && err != -EOPNOTSUPP)373 goto unlock;374 }375 376 if (!val)377 client->flags &= ~I2C_CLIENT_PEC;378 else379 client->flags |= I2C_CLIENT_PEC;380 381 err = count;382unlock:383 mutex_unlock(&hwmon_pec_mutex);384 put_device(hdev);385 386 return err;387}388 389static DEVICE_ATTR_RW(pec);390 391static void hwmon_remove_pec(void *dev)392{393 device_remove_file(dev, &dev_attr_pec);394}395 396static int hwmon_pec_register(struct device *hdev)397{398 struct i2c_client *client = i2c_verify_client(hdev->parent);399 int err;400 401 if (!client)402 return -EINVAL;403 404 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_PEC))405 return 0;406 407 err = device_create_file(&client->dev, &dev_attr_pec);408 if (err)409 return err;410 411 return devm_add_action_or_reset(hdev, hwmon_remove_pec, &client->dev);412}413 414#else /* CONFIG_I2C */415static int hwmon_pec_register(struct device *hdev)416{417 return -EINVAL;418}419#endif /* CONFIG_I2C */420 421/* sysfs attribute management */422 423static ssize_t hwmon_attr_show(struct device *dev,424 struct device_attribute *devattr, char *buf)425{426 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);427 long val;428 int ret;429 430 ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,431 &val);432 if (ret < 0)433 return ret;434 435 trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),436 hattr->name, val);437 438 return sprintf(buf, "%ld\n", val);439}440 441static ssize_t hwmon_attr_show_string(struct device *dev,442 struct device_attribute *devattr,443 char *buf)444{445 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);446 enum hwmon_sensor_types type = hattr->type;447 const char *s;448 int ret;449 450 ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,451 hattr->index, &s);452 if (ret < 0)453 return ret;454 455 trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),456 hattr->name, s);457 458 return sprintf(buf, "%s\n", s);459}460 461static ssize_t hwmon_attr_store(struct device *dev,462 struct device_attribute *devattr,463 const char *buf, size_t count)464{465 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);466 long val;467 int ret;468 469 ret = kstrtol(buf, 10, &val);470 if (ret < 0)471 return ret;472 473 ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,474 val);475 if (ret < 0)476 return ret;477 478 trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),479 hattr->name, val);480 481 return count;482}483 484static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)485{486 return (type == hwmon_temp && attr == hwmon_temp_label) ||487 (type == hwmon_in && attr == hwmon_in_label) ||488 (type == hwmon_curr && attr == hwmon_curr_label) ||489 (type == hwmon_power && attr == hwmon_power_label) ||490 (type == hwmon_energy && attr == hwmon_energy_label) ||491 (type == hwmon_humidity && attr == hwmon_humidity_label) ||492 (type == hwmon_fan && attr == hwmon_fan_label);493}494 495static struct attribute *hwmon_genattr(const void *drvdata,496 enum hwmon_sensor_types type,497 u32 attr,498 int index,499 const char *template,500 const struct hwmon_ops *ops)501{502 struct hwmon_device_attribute *hattr;503 struct device_attribute *dattr;504 struct attribute *a;505 umode_t mode;506 const char *name;507 bool is_string = is_string_attr(type, attr);508 509 mode = ops->is_visible(drvdata, type, attr, index);510 if (!mode)511 return ERR_PTR(-ENOENT);512 513 if ((mode & 0444) && ((is_string && !ops->read_string) ||514 (!is_string && !ops->read)))515 return ERR_PTR(-EINVAL);516 if ((mode & 0222) && !ops->write)517 return ERR_PTR(-EINVAL);518 519 hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);520 if (!hattr)521 return ERR_PTR(-ENOMEM);522 523 if (type == hwmon_chip) {524 name = template;525 } else {526 scnprintf(hattr->name, sizeof(hattr->name), template,527 index + hwmon_attr_base(type));528 name = hattr->name;529 }530 531 hattr->type = type;532 hattr->attr = attr;533 hattr->index = index;534 hattr->ops = ops;535 536 dattr = &hattr->dev_attr;537 dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;538 dattr->store = hwmon_attr_store;539 540 a = &dattr->attr;541 sysfs_attr_init(a);542 a->name = name;543 a->mode = mode;544 545 return a;546}547 548/*549 * Chip attributes are not attribute templates but actual sysfs attributes.550 * See hwmon_genattr() for special handling.551 */552static const char * const hwmon_chip_attrs[] = {553 [hwmon_chip_temp_reset_history] = "temp_reset_history",554 [hwmon_chip_in_reset_history] = "in_reset_history",555 [hwmon_chip_curr_reset_history] = "curr_reset_history",556 [hwmon_chip_power_reset_history] = "power_reset_history",557 [hwmon_chip_update_interval] = "update_interval",558 [hwmon_chip_alarms] = "alarms",559 [hwmon_chip_samples] = "samples",560 [hwmon_chip_curr_samples] = "curr_samples",561 [hwmon_chip_in_samples] = "in_samples",562 [hwmon_chip_power_samples] = "power_samples",563 [hwmon_chip_temp_samples] = "temp_samples",564 [hwmon_chip_beep_enable] = "beep_enable",565};566 567static const char * const hwmon_temp_attr_templates[] = {568 [hwmon_temp_enable] = "temp%d_enable",569 [hwmon_temp_input] = "temp%d_input",570 [hwmon_temp_type] = "temp%d_type",571 [hwmon_temp_lcrit] = "temp%d_lcrit",572 [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",573 [hwmon_temp_min] = "temp%d_min",574 [hwmon_temp_min_hyst] = "temp%d_min_hyst",575 [hwmon_temp_max] = "temp%d_max",576 [hwmon_temp_max_hyst] = "temp%d_max_hyst",577 [hwmon_temp_crit] = "temp%d_crit",578 [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",579 [hwmon_temp_emergency] = "temp%d_emergency",580 [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",581 [hwmon_temp_alarm] = "temp%d_alarm",582 [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",583 [hwmon_temp_min_alarm] = "temp%d_min_alarm",584 [hwmon_temp_max_alarm] = "temp%d_max_alarm",585 [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",586 [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",587 [hwmon_temp_fault] = "temp%d_fault",588 [hwmon_temp_offset] = "temp%d_offset",589 [hwmon_temp_label] = "temp%d_label",590 [hwmon_temp_lowest] = "temp%d_lowest",591 [hwmon_temp_highest] = "temp%d_highest",592 [hwmon_temp_reset_history] = "temp%d_reset_history",593 [hwmon_temp_rated_min] = "temp%d_rated_min",594 [hwmon_temp_rated_max] = "temp%d_rated_max",595 [hwmon_temp_beep] = "temp%d_beep",596};597 598static const char * const hwmon_in_attr_templates[] = {599 [hwmon_in_enable] = "in%d_enable",600 [hwmon_in_input] = "in%d_input",601 [hwmon_in_min] = "in%d_min",602 [hwmon_in_max] = "in%d_max",603 [hwmon_in_lcrit] = "in%d_lcrit",604 [hwmon_in_crit] = "in%d_crit",605 [hwmon_in_average] = "in%d_average",606 [hwmon_in_lowest] = "in%d_lowest",607 [hwmon_in_highest] = "in%d_highest",608 [hwmon_in_reset_history] = "in%d_reset_history",609 [hwmon_in_label] = "in%d_label",610 [hwmon_in_alarm] = "in%d_alarm",611 [hwmon_in_min_alarm] = "in%d_min_alarm",612 [hwmon_in_max_alarm] = "in%d_max_alarm",613 [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",614 [hwmon_in_crit_alarm] = "in%d_crit_alarm",615 [hwmon_in_rated_min] = "in%d_rated_min",616 [hwmon_in_rated_max] = "in%d_rated_max",617 [hwmon_in_beep] = "in%d_beep",618 [hwmon_in_fault] = "in%d_fault",619};620 621static const char * const hwmon_curr_attr_templates[] = {622 [hwmon_curr_enable] = "curr%d_enable",623 [hwmon_curr_input] = "curr%d_input",624 [hwmon_curr_min] = "curr%d_min",625 [hwmon_curr_max] = "curr%d_max",626 [hwmon_curr_lcrit] = "curr%d_lcrit",627 [hwmon_curr_crit] = "curr%d_crit",628 [hwmon_curr_average] = "curr%d_average",629 [hwmon_curr_lowest] = "curr%d_lowest",630 [hwmon_curr_highest] = "curr%d_highest",631 [hwmon_curr_reset_history] = "curr%d_reset_history",632 [hwmon_curr_label] = "curr%d_label",633 [hwmon_curr_alarm] = "curr%d_alarm",634 [hwmon_curr_min_alarm] = "curr%d_min_alarm",635 [hwmon_curr_max_alarm] = "curr%d_max_alarm",636 [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",637 [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",638 [hwmon_curr_rated_min] = "curr%d_rated_min",639 [hwmon_curr_rated_max] = "curr%d_rated_max",640 [hwmon_curr_beep] = "curr%d_beep",641};642 643static const char * const hwmon_power_attr_templates[] = {644 [hwmon_power_enable] = "power%d_enable",645 [hwmon_power_average] = "power%d_average",646 [hwmon_power_average_interval] = "power%d_average_interval",647 [hwmon_power_average_interval_max] = "power%d_interval_max",648 [hwmon_power_average_interval_min] = "power%d_interval_min",649 [hwmon_power_average_highest] = "power%d_average_highest",650 [hwmon_power_average_lowest] = "power%d_average_lowest",651 [hwmon_power_average_max] = "power%d_average_max",652 [hwmon_power_average_min] = "power%d_average_min",653 [hwmon_power_input] = "power%d_input",654 [hwmon_power_input_highest] = "power%d_input_highest",655 [hwmon_power_input_lowest] = "power%d_input_lowest",656 [hwmon_power_reset_history] = "power%d_reset_history",657 [hwmon_power_accuracy] = "power%d_accuracy",658 [hwmon_power_cap] = "power%d_cap",659 [hwmon_power_cap_hyst] = "power%d_cap_hyst",660 [hwmon_power_cap_max] = "power%d_cap_max",661 [hwmon_power_cap_min] = "power%d_cap_min",662 [hwmon_power_min] = "power%d_min",663 [hwmon_power_max] = "power%d_max",664 [hwmon_power_lcrit] = "power%d_lcrit",665 [hwmon_power_crit] = "power%d_crit",666 [hwmon_power_label] = "power%d_label",667 [hwmon_power_alarm] = "power%d_alarm",668 [hwmon_power_cap_alarm] = "power%d_cap_alarm",669 [hwmon_power_min_alarm] = "power%d_min_alarm",670 [hwmon_power_max_alarm] = "power%d_max_alarm",671 [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",672 [hwmon_power_crit_alarm] = "power%d_crit_alarm",673 [hwmon_power_rated_min] = "power%d_rated_min",674 [hwmon_power_rated_max] = "power%d_rated_max",675};676 677static const char * const hwmon_energy_attr_templates[] = {678 [hwmon_energy_enable] = "energy%d_enable",679 [hwmon_energy_input] = "energy%d_input",680 [hwmon_energy_label] = "energy%d_label",681};682 683static const char * const hwmon_humidity_attr_templates[] = {684 [hwmon_humidity_enable] = "humidity%d_enable",685 [hwmon_humidity_input] = "humidity%d_input",686 [hwmon_humidity_label] = "humidity%d_label",687 [hwmon_humidity_min] = "humidity%d_min",688 [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",689 [hwmon_humidity_max] = "humidity%d_max",690 [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",691 [hwmon_humidity_alarm] = "humidity%d_alarm",692 [hwmon_humidity_fault] = "humidity%d_fault",693 [hwmon_humidity_rated_min] = "humidity%d_rated_min",694 [hwmon_humidity_rated_max] = "humidity%d_rated_max",695 [hwmon_humidity_min_alarm] = "humidity%d_min_alarm",696 [hwmon_humidity_max_alarm] = "humidity%d_max_alarm",697};698 699static const char * const hwmon_fan_attr_templates[] = {700 [hwmon_fan_enable] = "fan%d_enable",701 [hwmon_fan_input] = "fan%d_input",702 [hwmon_fan_label] = "fan%d_label",703 [hwmon_fan_min] = "fan%d_min",704 [hwmon_fan_max] = "fan%d_max",705 [hwmon_fan_div] = "fan%d_div",706 [hwmon_fan_pulses] = "fan%d_pulses",707 [hwmon_fan_target] = "fan%d_target",708 [hwmon_fan_alarm] = "fan%d_alarm",709 [hwmon_fan_min_alarm] = "fan%d_min_alarm",710 [hwmon_fan_max_alarm] = "fan%d_max_alarm",711 [hwmon_fan_fault] = "fan%d_fault",712 [hwmon_fan_beep] = "fan%d_beep",713};714 715static const char * const hwmon_pwm_attr_templates[] = {716 [hwmon_pwm_input] = "pwm%d",717 [hwmon_pwm_enable] = "pwm%d_enable",718 [hwmon_pwm_mode] = "pwm%d_mode",719 [hwmon_pwm_freq] = "pwm%d_freq",720 [hwmon_pwm_auto_channels_temp] = "pwm%d_auto_channels_temp",721};722 723static const char * const hwmon_intrusion_attr_templates[] = {724 [hwmon_intrusion_alarm] = "intrusion%d_alarm",725 [hwmon_intrusion_beep] = "intrusion%d_beep",726};727 728static const char * const *__templates[] = {729 [hwmon_chip] = hwmon_chip_attrs,730 [hwmon_temp] = hwmon_temp_attr_templates,731 [hwmon_in] = hwmon_in_attr_templates,732 [hwmon_curr] = hwmon_curr_attr_templates,733 [hwmon_power] = hwmon_power_attr_templates,734 [hwmon_energy] = hwmon_energy_attr_templates,735 [hwmon_humidity] = hwmon_humidity_attr_templates,736 [hwmon_fan] = hwmon_fan_attr_templates,737 [hwmon_pwm] = hwmon_pwm_attr_templates,738 [hwmon_intrusion] = hwmon_intrusion_attr_templates,739};740 741static const int __templates_size[] = {742 [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),743 [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),744 [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),745 [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),746 [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),747 [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),748 [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),749 [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),750 [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),751 [hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates),752};753 754int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,755 u32 attr, int channel)756{757 char event[MAX_SYSFS_ATTR_NAME_LENGTH + 5];758 char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];759 char *envp[] = { event, NULL };760 const char * const *templates;761 const char *template;762 int base;763 764 if (type >= ARRAY_SIZE(__templates))765 return -EINVAL;766 if (attr >= __templates_size[type])767 return -EINVAL;768 769 templates = __templates[type];770 template = templates[attr];771 772 base = hwmon_attr_base(type);773 774 scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);775 scnprintf(event, sizeof(event), "NAME=%s", sattr);776 sysfs_notify(&dev->kobj, NULL, sattr);777 kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);778 779 if (type == hwmon_temp)780 hwmon_thermal_notify(dev, channel);781 782 return 0;783}784EXPORT_SYMBOL_GPL(hwmon_notify_event);785 786static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)787{788 int i, n;789 790 for (i = n = 0; info->config[i]; i++)791 n += hweight32(info->config[i]);792 793 return n;794}795 796static int hwmon_genattrs(const void *drvdata,797 struct attribute **attrs,798 const struct hwmon_ops *ops,799 const struct hwmon_channel_info *info)800{801 const char * const *templates;802 int template_size;803 int i, aindex = 0;804 805 if (info->type >= ARRAY_SIZE(__templates))806 return -EINVAL;807 808 templates = __templates[info->type];809 template_size = __templates_size[info->type];810 811 for (i = 0; info->config[i]; i++) {812 u32 attr_mask = info->config[i];813 u32 attr;814 815 while (attr_mask) {816 struct attribute *a;817 818 attr = __ffs(attr_mask);819 attr_mask &= ~BIT(attr);820 if (attr >= template_size || !templates[attr])821 continue; /* attribute is invisible */822 a = hwmon_genattr(drvdata, info->type, attr, i,823 templates[attr], ops);824 if (IS_ERR(a)) {825 if (PTR_ERR(a) != -ENOENT)826 return PTR_ERR(a);827 continue;828 }829 attrs[aindex++] = a;830 }831 }832 return aindex;833}834 835static struct attribute **836__hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)837{838 int ret, i, aindex = 0, nattrs = 0;839 struct attribute **attrs;840 841 for (i = 0; chip->info[i]; i++)842 nattrs += hwmon_num_channel_attrs(chip->info[i]);843 844 if (nattrs == 0)845 return ERR_PTR(-EINVAL);846 847 attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);848 if (!attrs)849 return ERR_PTR(-ENOMEM);850 851 for (i = 0; chip->info[i]; i++) {852 ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,853 chip->info[i]);854 if (ret < 0) {855 hwmon_free_attrs(attrs);856 return ERR_PTR(ret);857 }858 aindex += ret;859 }860 861 return attrs;862}863 864static HWJS_SUSPENDS struct device *865__hwmon_device_register(struct device *dev, const char *name, void *drvdata,866 const struct hwmon_chip_info *chip,867 const struct attribute_group **groups)868{869 struct hwmon_device *hwdev;870 const char *label;871 struct device *hdev;872 struct device *tdev = dev;873 int i, err, id;874 875 /* Complain about invalid characters in hwmon name attribute */876 if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))877 dev_warn(dev,878 "hwmon: '%s' is not a valid name attribute, please fix\n",879 name);880 881 id = ida_alloc(&hwmon_ida, GFP_KERNEL);882 if (id < 0)883 return ERR_PTR(id);884 885 hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);886 if (hwdev == NULL) {887 err = -ENOMEM;888 goto ida_remove;889 }890 891 hdev = &hwdev->dev;892 893 if (chip) {894 struct attribute **attrs;895 int ngroups = 2; /* terminating NULL plus &hwdev->groups */896 897 if (groups)898 for (i = 0; groups[i]; i++)899 ngroups++;900 901 hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);902 if (!hwdev->groups) {903 err = -ENOMEM;904 goto free_hwmon;905 }906 907 attrs = __hwmon_create_attrs(drvdata, chip);908 if (IS_ERR(attrs)) {909 err = PTR_ERR(attrs);910 goto free_hwmon;911 }912 913 hwdev->group.attrs = attrs;914 ngroups = 0;915 hwdev->groups[ngroups++] = &hwdev->group;916 917 if (groups) {918 for (i = 0; groups[i]; i++)919 hwdev->groups[ngroups++] = groups[i];920 }921 922 hdev->groups = hwdev->groups;923 } else {924 hdev->groups = groups;925 }926 927 if (dev && device_property_present(dev, "label")) {928 err = device_property_read_string(dev, "label", &label);929 if (err < 0)930 goto free_hwmon;931 932 hwdev->label = kstrdup(label, GFP_KERNEL);933 if (hwdev->label == NULL) {934 err = -ENOMEM;935 goto free_hwmon;936 }937 }938 939 hwdev->name = name;940 hdev->class = &hwmon_class;941 hdev->parent = dev;942 while (tdev && !tdev->of_node)943 tdev = tdev->parent;944 hdev->of_node = tdev ? tdev->of_node : NULL;945 hwdev->chip = chip;946 dev_set_drvdata(hdev, drvdata);947 dev_set_name(hdev, HWMON_ID_FORMAT, id);948 err = device_register(hdev);949 if (err) {950 put_device(hdev);951 goto ida_remove;952 }953 954 INIT_LIST_HEAD(&hwdev->tzdata);955 956 if (hdev->of_node && chip && chip->ops->read &&957 chip->info[0]->type == hwmon_chip) {958 u32 config = chip->info[0]->config[0];959 960 if (config & HWMON_C_REGISTER_TZ) {961 err = hwmon_thermal_register_sensors(hdev);962 if (err) {963 device_unregister(hdev);964 /*965 * Don't worry about hwdev; hwmon_dev_release(),966 * called from device_unregister(), will free it.967 */968 goto ida_remove;969 }970 }971 if (config & HWMON_C_PEC) {972 err = hwmon_pec_register(hdev);973 if (err) {974 device_unregister(hdev);975 goto ida_remove;976 }977 }978 }979 980 return hdev;981 982free_hwmon:983 hwmon_dev_release(hdev);984ida_remove:985 ida_free(&hwmon_ida, id);986 return ERR_PTR(err);987}988 989/**990 * hwmon_device_register_with_groups - register w/ hwmon991 * @dev: the parent device992 * @name: hwmon name attribute993 * @drvdata: driver data to attach to created device994 * @groups: List of attribute groups to create995 *996 * hwmon_device_unregister() must be called when the device is no997 * longer needed.998 *999 * Returns the pointer to the new device.1000 */1001struct device *1002hwmon_device_register_with_groups(struct device *dev, const char *name,1003 void *drvdata,1004 const struct attribute_group **groups)1005{1006 if (!name)1007 return ERR_PTR(-EINVAL);1008 1009 return __hwmon_device_register(dev, name, drvdata, NULL, groups);1010}1011EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);1012 1013/**1014 * hwmon_device_register_with_info - register w/ hwmon1015 * @dev: the parent device (mandatory)1016 * @name: hwmon name attribute (mandatory)1017 * @drvdata: driver data to attach to created device (optional)1018 * @chip: pointer to hwmon chip information (mandatory)1019 * @extra_groups: pointer to list of additional non-standard attribute groups1020 * (optional)1021 *1022 * hwmon_device_unregister() must be called when the device is no1023 * longer needed.1024 *1025 * Returns the pointer to the new device.1026 */1027struct device *1028hwmon_device_register_with_info(struct device *dev, const char *name,1029 void *drvdata,1030 const struct hwmon_chip_info *chip,1031 const struct attribute_group **extra_groups)1032{1033 if (!dev || !name || !chip)1034 return ERR_PTR(-EINVAL);1035 1036 if (!chip->ops || !chip->ops->is_visible || !chip->info)1037 return ERR_PTR(-EINVAL);1038 1039 return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);1040}1041EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);1042 1043/**1044 * hwmon_device_register_for_thermal - register hwmon device for thermal subsystem1045 * @dev: the parent device1046 * @name: hwmon name attribute1047 * @drvdata: driver data to attach to created device1048 *1049 * The use of this function is restricted. It is provided for legacy reasons1050 * and must only be called from the thermal subsystem.1051 *1052 * hwmon_device_unregister() must be called when the device is no1053 * longer needed.1054 *1055 * Returns the pointer to the new device.1056 */1057struct device *1058hwmon_device_register_for_thermal(struct device *dev, const char *name,1059 void *drvdata)1060{1061 if (!name || !dev)1062 return ERR_PTR(-EINVAL);1063 1064 return __hwmon_device_register(dev, name, drvdata, NULL, NULL);1065}1066EXPORT_SYMBOL_NS_GPL(hwmon_device_register_for_thermal, HWMON_THERMAL);1067 1068/**1069 * hwmon_device_register - register w/ hwmon1070 * @dev: the device to register1071 *1072 * hwmon_device_unregister() must be called when the device is no1073 * longer needed.1074 *1075 * Returns the pointer to the new device.1076 */1077struct device *hwmon_device_register(struct device *dev)1078{1079 dev_warn(dev,1080 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");1081 1082 return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);1083}1084EXPORT_SYMBOL_GPL(hwmon_device_register);1085 1086/**1087 * hwmon_device_unregister - removes the previously registered class device1088 *1089 * @dev: the class device to destroy1090 */1091void hwmon_device_unregister(struct device *dev)1092{1093 int id;1094 1095 if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {1096 device_unregister(dev);1097 ida_free(&hwmon_ida, id);1098 } else1099 dev_dbg(dev->parent,1100 "hwmon_device_unregister() failed: bad class ID!\n");1101}1102EXPORT_SYMBOL_GPL(hwmon_device_unregister);1103 1104static HWJS_SUSPENDS void devm_hwmon_release(struct device *dev, void *res)1105{1106 struct device *hwdev = *(struct device **)res;1107 1108 hwmon_device_unregister(hwdev);1109}1110 1111/**1112 * devm_hwmon_device_register_with_groups - register w/ hwmon1113 * @dev: the parent device1114 * @name: hwmon name attribute1115 * @drvdata: driver data to attach to created device1116 * @groups: List of attribute groups to create1117 *1118 * Returns the pointer to the new device. The new device is automatically1119 * unregistered with the parent device.1120 */1121struct device *1122devm_hwmon_device_register_with_groups(struct device *dev, const char *name,1123 void *drvdata,1124 const struct attribute_group **groups)1125{1126 struct device **ptr, *hwdev;1127 1128 if (!dev)1129 return ERR_PTR(-EINVAL);1130 1131 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);1132 if (!ptr)1133 return ERR_PTR(-ENOMEM);1134 1135 hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);1136 if (IS_ERR(hwdev))1137 goto error;1138 1139 *ptr = hwdev;1140 devres_add(dev, ptr);1141 return hwdev;1142 1143error:1144 devres_free(ptr);1145 return hwdev;1146}1147EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);1148 1149/**1150 * devm_hwmon_device_register_with_info - register w/ hwmon1151 * @dev: the parent device1152 * @name: hwmon name attribute1153 * @drvdata: driver data to attach to created device1154 * @chip: pointer to hwmon chip information1155 * @extra_groups: pointer to list of driver specific attribute groups1156 *1157 * Returns the pointer to the new device. The new device is automatically1158 * unregistered with the parent device.1159 */1160struct device *1161devm_hwmon_device_register_with_info(struct device *dev, const char *name,1162 void *drvdata,1163 const struct hwmon_chip_info *chip,1164 const struct attribute_group **extra_groups)1165{1166 struct device **ptr, *hwdev;1167 1168 if (!dev)1169 return ERR_PTR(-EINVAL);1170 1171 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);1172 if (!ptr)1173 return ERR_PTR(-ENOMEM);1174 1175 hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,1176 extra_groups);1177 if (IS_ERR(hwdev))1178 goto error;1179 1180 *ptr = hwdev;1181 devres_add(dev, ptr);1182 1183 return hwdev;1184 1185error:1186 devres_free(ptr);1187 return hwdev;1188}1189EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);1190 1191static char *__hwmon_sanitize_name(struct device *dev, const char *old_name)1192{1193 char *name, *p;1194 1195 if (dev)1196 name = devm_kstrdup(dev, old_name, GFP_KERNEL);1197 else1198 name = kstrdup(old_name, GFP_KERNEL);1199 if (!name)1200 return ERR_PTR(-ENOMEM);1201 1202 for (p = name; *p; p++)1203 if (hwmon_is_bad_char(*p))1204 *p = '_';1205 1206 return name;1207}1208 1209/**1210 * hwmon_sanitize_name - Replaces invalid characters in a hwmon name1211 * @name: NUL-terminated name1212 *1213 * Allocates a new string where any invalid characters will be replaced1214 * by an underscore. It is the responsibility of the caller to release1215 * the memory.1216 *1217 * Returns newly allocated name, or ERR_PTR on error.1218 */1219char *hwmon_sanitize_name(const char *name)1220{1221 return __hwmon_sanitize_name(NULL, name);1222}1223EXPORT_SYMBOL_GPL(hwmon_sanitize_name);1224 1225/**1226 * devm_hwmon_sanitize_name - resource managed hwmon_sanitize_name()1227 * @dev: device to allocate memory for1228 * @name: NUL-terminated name1229 *1230 * Allocates a new string where any invalid characters will be replaced1231 * by an underscore.1232 *1233 * Returns newly allocated name, or ERR_PTR on error.1234 */1235char *devm_hwmon_sanitize_name(struct device *dev, const char *name)1236{1237 if (!dev)1238 return ERR_PTR(-EINVAL);1239 1240 return __hwmon_sanitize_name(dev, name);1241}1242EXPORT_SYMBOL_GPL(devm_hwmon_sanitize_name);1243 1244static void __init hwmon_pci_quirks(void)1245{1246#if defined CONFIG_X86 && defined CONFIG_PCI1247 struct pci_dev *sb;1248 u16 base;1249 u8 enable;1250 1251 /* Open access to 0x295-0x296 on MSI MS-7031 */1252 sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);1253 if (sb) {1254 if (sb->subsystem_vendor == 0x1462 && /* MSI */1255 sb->subsystem_device == 0x0031) { /* MS-7031 */1256 pci_read_config_byte(sb, 0x48, &enable);1257 pci_read_config_word(sb, 0x64, &base);1258 1259 if (base == 0 && !(enable & BIT(2))) {1260 dev_info(&sb->dev,1261 "Opening wide generic port at 0x295\n");1262 pci_write_config_word(sb, 0x64, 0x295);1263 pci_write_config_byte(sb, 0x48,1264 enable | BIT(2));1265 }1266 }1267 pci_dev_put(sb);1268 }1269#endif1270}1271 1272static int __init hwmon_init(void)1273{1274 int err;1275 1276 hwmon_pci_quirks();1277 1278 err = class_register(&hwmon_class);1279 if (err) {1280 pr_err("couldn't register hwmon sysfs class\n");1281 return err;1282 }1283 return 0;1284}1285 1286static void __exit hwmon_exit(void)1287{1288 class_unregister(&hwmon_class);1289}1290 1291subsys_initcall(hwmon_init);1292module_exit(hwmon_exit);1293 1294MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");1295MODULE_DESCRIPTION("hardware monitoring sysfs/class support");1296MODULE_LICENSE("GPL");1297 1298