| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Rafael J. Wysocki | 1858 | 40.38% | 43 | 30.07% |
| Andy Grover | 959 | 20.84% | 7 | 4.90% |
| Rui Zhang | 570 | 12.39% | 16 | 11.19% |
| Len Brown | 351 | 7.63% | 14 | 9.79% |
| Daniel Lezcano | 197 | 4.28% | 5 | 3.50% |
| Aaron Lu | 107 | 2.33% | 1 | 0.70% |
| Konstantin Karasyov | 80 | 1.74% | 3 | 2.10% |
| Patrick Mochel | 60 | 1.30% | 3 | 2.10% |
| Matthew Garrett | 56 | 1.22% | 3 | 2.10% |
| Thomas Renninger | 50 | 1.09% | 3 | 2.10% |
| Michal Wilczynski | 48 | 1.04% | 1 | 0.70% |
| Jean Delvare | 43 | 0.93% | 1 | 0.70% |
| Matthew Wilcox | 41 | 0.89% | 1 | 0.70% |
| Andrzej Pietrasiewicz | 32 | 0.70% | 3 | 2.10% |
| Andy Shevchenko | 22 | 0.48% | 1 | 0.70% |
| Linus Torvalds (pre-git) | 16 | 0.35% | 7 | 4.90% |
| Dan Carpenter | 14 | 0.30% | 2 | 1.40% |
| Greg Kroah-Hartman | 12 | 0.26% | 1 | 0.70% |
| Rusty Russell | 10 | 0.22% | 1 | 0.70% |
| Akinobu Mita | 8 | 0.17% | 1 | 0.70% |
| Stephen Rothwell | 7 | 0.15% | 1 | 0.70% |
| Bhaktipriya Shridhar | 7 | 0.15% | 1 | 0.70% |
| Shuah Khan | 6 | 0.13% | 1 | 0.70% |
| Alexey Y. Starikovskiy | 5 | 0.11% | 1 | 0.70% |
| Jeff Garzik | 4 | 0.09% | 1 | 0.70% |
| Aristeu Sergio Rozanski Filho | 4 | 0.09% | 1 | 0.70% |
| Durgadoss R | 4 | 0.09% | 2 | 1.40% |
| Andrew Morton | 3 | 0.07% | 1 | 0.70% |
| Björn Helgaas | 3 | 0.07% | 1 | 0.70% |
| Krzysztof Helt | 3 | 0.07% | 1 | 0.70% |
| Kapileshwar Singh | 2 | 0.04% | 1 | 0.70% |
| Thomas Gleixner | 2 | 0.04% | 1 | 0.70% |
| Mario Limonciello | 2 | 0.04% | 1 | 0.70% |
| Linus Torvalds | 2 | 0.04% | 2 | 1.40% |
| Dawei Li | 2 | 0.04% | 1 | 0.70% |
| Pavel Machek | 2 | 0.04% | 1 | 0.70% |
| Christoph Hellwig | 2 | 0.04% | 1 | 0.70% |
| Jiangshan Yi | 1 | 0.02% | 1 | 0.70% |
| Burman Yan | 1 | 0.02% | 1 | 0.70% |
| Lv Zheng | 1 | 0.02% | 1 | 0.70% |
| Kay Sievers | 1 | 0.02% | 1 | 0.70% |
| Arjan van de Ven | 1 | 0.02% | 1 | 0.70% |
| Sascha Hauer | 1 | 0.02% | 1 | 0.70% |
| Vasily Averin | 1 | 0.02% | 1 | 0.70% |
| Total | 4601 | 143 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $) * * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> * * This driver fully implements the ACPI thermal policy as described in the * ACPI 2.0 Specification. * * TBD: 1. Implement passive cooling hysteresis. * 2. Enhance passive cooling (CPU) states/limit interface to support * concepts of 'multiple limiters', upper/lower limits, etc. */ #define pr_fmt(fmt) "ACPI: thermal: " fmt #include <linux/kernel.h> #include <linux/module.h> #include <linux/dmi.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/jiffies.h> #include <linux/kmod.h> #include <linux/reboot.h> #include <linux/device.h> #include <linux/thermal.h> #include <linux/acpi.h> #include <linux/workqueue.h> #include <linux/uaccess.h> #include <linux/units.h> #define ACPI_THERMAL_CLASS "thermal_zone" #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone" #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0 #define ACPI_THERMAL_NOTIFY_HOT 0xF1 #define ACPI_THERMAL_MODE_ACTIVE 0x00 #define ACPI_THERMAL_MAX_ACTIVE 10 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65 #define ACPI_THERMAL_TRIP_PASSIVE (-1) /* * This exception is thrown out in two cases: * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid * when re-evaluating the AML code. * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change. * We need to re-bind the cooling devices of a thermal zone when this occurs. */ #define ACPI_THERMAL_TRIPS_EXCEPTION(tz, str) \ do { \ acpi_handle_info(tz->device->handle, \ "ACPI thermal trip point %s changed\n" \ "Please report to linux-acpi@vger.kernel.org\n", str); \ } while (0) static int act; module_param(act, int, 0644); MODULE_PARM_DESC(act, "Disable or override all lowest active trip points."); static int crt; module_param(crt, int, 0644); MODULE_PARM_DESC(crt, "Disable or lower all critical trip points."); static int tzp; module_param(tzp, int, 0444); MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds."); static int off; module_param(off, int, 0); MODULE_PARM_DESC(off, "Set to disable ACPI thermal support."); static int psv; module_param(psv, int, 0644); MODULE_PARM_DESC(psv, "Disable or override all passive trip points."); static struct workqueue_struct *acpi_thermal_pm_queue; struct acpi_thermal_trip { unsigned long temp_dk; struct acpi_handle_list devices; }; struct acpi_thermal_passive { struct acpi_thermal_trip trip; unsigned long tc1; unsigned long tc2; unsigned long tsp; }; struct acpi_thermal_active { struct acpi_thermal_trip trip; }; struct acpi_thermal_trips { struct acpi_thermal_passive passive; struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE]; }; struct acpi_thermal { struct acpi_device *device; acpi_bus_id name; unsigned long temp_dk; unsigned long last_temp_dk; unsigned long polling_frequency; volatile u8 zombie; struct acpi_thermal_trips trips; struct thermal_trip *trip_table; struct thermal_zone_device *thermal_zone; int kelvin_offset; /* in millidegrees */ struct work_struct thermal_check_work; struct mutex thermal_check_lock; refcount_t thermal_check_count; }; /* -------------------------------------------------------------------------- Thermal Zone Management -------------------------------------------------------------------------- */ static int acpi_thermal_get_temperature(struct acpi_thermal *tz) { acpi_status status = AE_OK; unsigned long long tmp; if (!tz) return -EINVAL; tz->last_temp_dk = tz->temp_dk; status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp); if (ACPI_FAILURE(status)) return -ENODEV; tz->temp_dk = tmp; acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n", tz->temp_dk); return 0; } static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz) { acpi_status status = AE_OK; unsigned long long tmp; if (!tz) return -EINVAL; status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp); if (ACPI_FAILURE(status)) return -ENODEV; tz->polling_frequency = tmp; acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n", tz->polling_frequency); return 0; } static int acpi_thermal_temp(struct acpi_thermal *tz, int temp_deci_k) { if (temp_deci_k == THERMAL_TEMP_INVALID) return THERMAL_TEMP_INVALID; return deci_kelvin_to_millicelsius_with_offset(temp_deci_k, tz->kelvin_offset); } static bool acpi_thermal_trip_valid(struct acpi_thermal_trip *acpi_trip) { return acpi_trip->temp_dk != THERMAL_TEMP_INVALID; } static int active_trip_index(struct acpi_thermal *tz, struct acpi_thermal_trip *acpi_trip) { struct acpi_thermal_active *active; active = container_of(acpi_trip, struct acpi_thermal_active, trip); return active - tz->trips.active; } static long get_passive_temp(struct acpi_thermal *tz) { unsigned long long tmp; acpi_status status; status = acpi_evaluate_integer(tz->device->handle, "_PSV", NULL, &tmp); if (ACPI_FAILURE(status)) return THERMAL_TEMP_INVALID; return tmp; } static long get_active_temp(struct acpi_thermal *tz, int index) { char method[] = { '_', 'A', 'C', '0' + index, '\0' }; unsigned long long tmp; acpi_status status; status = acpi_evaluate_integer(tz->device->handle, method, NULL, &tmp); if (ACPI_FAILURE(status)) return THERMAL_TEMP_INVALID; /* * If an override has been provided, apply it so there are no active * trips with thresholds greater than the override. */ if (act > 0) { unsigned long long override = celsius_to_deci_kelvin(act); if (tmp > override) tmp = override; } return tmp; } static void acpi_thermal_update_trip(struct acpi_thermal *tz, const struct thermal_trip *trip) { struct acpi_thermal_trip *acpi_trip = trip->priv; if (trip->type == THERMAL_TRIP_PASSIVE) { if (psv > 0) return; acpi_trip->temp_dk = get_passive_temp(tz); } else { int index = active_trip_index(tz, acpi_trip); acpi_trip->temp_dk = get_active_temp(tz, index); } if (!acpi_thermal_trip_valid(acpi_trip)) ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state"); } static bool update_trip_devices(struct acpi_thermal *tz, struct acpi_thermal_trip *acpi_trip, int index, bool compare) { struct acpi_handle_list devices = { 0 }; char method[] = "_PSL"; acpi_status status; if (index != ACPI_THERMAL_TRIP_PASSIVE) { method[1] = 'A'; method[2] = 'L'; method[3] = '0' + index; } status = acpi_evaluate_reference(tz->device->handle, method, NULL, &devices); if (ACPI_FAILURE(status)) { acpi_handle_info(tz->device->handle, "%s evaluation failure\n", method); return false; } if (acpi_handle_list_equal(&acpi_trip->devices, &devices)) { acpi_handle_list_free(&devices); return true; } if (compare) ACPI_THERMAL_TRIPS_EXCEPTION(tz, "device"); acpi_handle_list_replace(&acpi_trip->devices, &devices); return true; } static void acpi_thermal_update_trip_devices(struct acpi_thermal *tz, const struct thermal_trip *trip) { struct acpi_thermal_trip *acpi_trip = trip->priv; int index = trip->type == THERMAL_TRIP_PASSIVE ? ACPI_THERMAL_TRIP_PASSIVE : active_trip_index(tz, acpi_trip); if (update_trip_devices(tz, acpi_trip, index, true)) return; acpi_trip->temp_dk = THERMAL_TEMP_INVALID; ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state"); } struct adjust_trip_data { struct acpi_thermal *tz; u32 event; }; static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data) { struct acpi_thermal_trip *acpi_trip = trip->priv; struct adjust_trip_data *atd = data; struct acpi_thermal *tz = atd->tz; if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip)) return 0; if (atd->event == ACPI_THERMAL_NOTIFY_THRESHOLDS) acpi_thermal_update_trip(tz, trip); else acpi_thermal_update_trip_devices(tz, trip); if (acpi_thermal_trip_valid(acpi_trip)) trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk); else trip->temperature = THERMAL_TEMP_INVALID; return 0; } static void acpi_queue_thermal_check(struct acpi_thermal *tz) { if (!work_pending(&tz->thermal_check_work)) queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work); } static void acpi_thermal_trips_update(struct acpi_thermal *tz, u32 event) { struct adjust_trip_data atd = { .tz = tz, .event = event }; struct acpi_device *adev = tz->device; /* * Use thermal_zone_for_each_trip() to carry out the trip points * update, so as to protect thermal_get_trend() from getting stale * trip point temperatures and to prevent thermal_zone_device_update() * invoked from acpi_thermal_check_fn() from producing inconsistent * results. */ thermal_zone_for_each_trip(tz->thermal_zone, acpi_thermal_adjust_trip, &atd); acpi_queue_thermal_check(tz); acpi_bus_generate_netlink_event(adev->pnp.device_class, dev_name(&adev->dev), event, 0); } static long acpi_thermal_get_critical_trip(struct acpi_thermal *tz) { unsigned long long tmp; acpi_status status; if (crt > 0) { tmp = celsius_to_deci_kelvin(crt); goto set; } if (crt == -1) { acpi_handle_debug(tz->device->handle, "Critical threshold disabled\n"); return THERMAL_TEMP_INVALID; } status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL, &tmp); if (ACPI_FAILURE(status)) { acpi_handle_debug(tz->device->handle, "No critical threshold\n"); return THERMAL_TEMP_INVALID; } if (tmp <= 2732) { /* * Below zero (Celsius) values clearly aren't right for sure, * so discard them as invalid. */ pr_info(FW_BUG "Invalid critical threshold (%llu)\n", tmp); return THERMAL_TEMP_INVALID; } set: acpi_handle_debug(tz->device->handle, "Critical threshold [%llu]\n", tmp); return tmp; } static long acpi_thermal_get_hot_trip(struct acpi_thermal *tz) { unsigned long long tmp; acpi_status status; status = acpi_evaluate_integer(tz->device->handle, "_HOT", NULL, &tmp); if (ACPI_FAILURE(status)) { acpi_handle_debug(tz->device->handle, "No hot threshold\n"); return THERMAL_TEMP_INVALID; } acpi_handle_debug(tz->device->handle, "Hot threshold [%llu]\n", tmp); return tmp; } static bool passive_trip_params_init(struct acpi_thermal *tz) { unsigned long long tmp; acpi_status status; status = acpi_evaluate_integer(tz->device->handle, "_TC1", NULL, &tmp); if (ACPI_FAILURE(status)) return false; tz->trips.passive.tc1 = tmp; status = acpi_evaluate_integer(tz->device->handle, "_TC2", NULL, &tmp); if (ACPI_FAILURE(status)) return false; tz->trips.passive.tc2 = tmp; status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp); if (ACPI_FAILURE(status)) return false; tz->trips.passive.tsp = tmp; return true; } static bool acpi_thermal_init_trip(struct acpi_thermal *tz, int index) { struct acpi_thermal_trip *acpi_trip; long temp; if (index == ACPI_THERMAL_TRIP_PASSIVE) { acpi_trip = &tz->trips.passive.trip; if (psv == -1) goto fail; if (!passive_trip_params_init(tz)) goto fail; temp = psv > 0 ? celsius_to_deci_kelvin(psv) : get_passive_temp(tz); } else { acpi_trip = &tz->trips.active[index].trip; if (act == -1) goto fail; temp = get_active_temp(tz, index); } if (temp == THERMAL_TEMP_INVALID) goto fail; if (!update_trip_devices(tz, acpi_trip, index, false)) goto fail; acpi_trip->temp_dk = temp; return true; fail: acpi_trip->temp_dk = THERMAL_TEMP_INVALID; return false; } static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) { unsigned int count = 0; int i; if (acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE)) count++; for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { if (acpi_thermal_init_trip(tz, i)) count++; else break; } while (++i < ACPI_THERMAL_MAX_ACTIVE) tz->trips.active[i].trip.temp_dk = THERMAL_TEMP_INVALID; return count; } /* sys I/F for generic thermal sysfs support */ static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp) { struct acpi_thermal *tz = thermal_zone_device_priv(thermal); int result; if (!tz) return -EINVAL; result = acpi_thermal_get_temperature(tz); if (result) return result; *temp = deci_kelvin_to_millicelsius_with_offset(tz->temp_dk, tz->kelvin_offset); return 0; } static int thermal_get_trend(struct thermal_zone_device *thermal, const struct thermal_trip *trip, enum thermal_trend *trend) { struct acpi_thermal *tz = thermal_zone_device_priv(thermal); struct acpi_thermal_trip *acpi_trip; int t; if (!tz || !trip) return -EINVAL; acpi_trip = trip->priv; if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip)) return -EINVAL; switch (trip->type) { case THERMAL_TRIP_PASSIVE: t = tz->trips.passive.tc1 * (tz->temp_dk - tz->last_temp_dk) + tz->trips.passive.tc2 * (tz->temp_dk - acpi_trip->temp_dk); if (t > 0) *trend = THERMAL_TREND_RAISING; else if (t < 0) *trend = THERMAL_TREND_DROPPING; else *trend = THERMAL_TREND_STABLE; return 0; case THERMAL_TRIP_ACTIVE: t = acpi_thermal_temp(tz, tz->temp_dk); if (t <= trip->temperature) break; *trend = THERMAL_TREND_RAISING; return 0; default: break; } return -EINVAL; } static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal) { struct acpi_thermal *tz = thermal_zone_device_priv(thermal); acpi_bus_generate_netlink_event(tz->device->pnp.device_class, dev_name(&tz->device->dev), ACPI_THERMAL_NOTIFY_HOT, 1); } static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal) { struct acpi_thermal *tz = thermal_zone_device_priv(thermal); acpi_bus_generate_netlink_event(tz->device->pnp.device_class, dev_name(&tz->device->dev), ACPI_THERMAL_NOTIFY_CRITICAL, 1); thermal_zone_device_critical(thermal); } struct acpi_thermal_bind_data { struct thermal_zone_device *thermal; struct thermal_cooling_device *cdev; bool bind; }; static int bind_unbind_cdev_cb(struct thermal_trip *trip, void *arg) { struct acpi_thermal_trip *acpi_trip = trip->priv; struct acpi_thermal_bind_data *bd = arg; struct thermal_zone_device *thermal = bd->thermal; struct thermal_cooling_device *cdev = bd->cdev; struct acpi_device *cdev_adev = cdev->devdata; int i; /* Skip critical and hot trips. */ if (!acpi_trip) return 0; for (i = 0; i < acpi_trip->devices.count; i++) { acpi_handle handle = acpi_trip->devices.handles[i]; struct acpi_device *adev = acpi_fetch_acpi_dev(handle); if (adev != cdev_adev) continue; if (bd->bind) { int ret; ret = thermal_bind_cdev_to_trip(thermal, trip, cdev, THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, THERMAL_WEIGHT_DEFAULT); if (ret) return ret; } else { thermal_unbind_cdev_from_trip(thermal, trip, cdev); } } return 0; } static int acpi_thermal_bind_unbind_cdev(struct thermal_zone_device *thermal, struct thermal_cooling_device *cdev, bool bind) { struct acpi_thermal_bind_data bd = { .thermal = thermal, .cdev = cdev, .bind = bind }; return for_each_thermal_trip(thermal, bind_unbind_cdev_cb, &bd); } static int acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, struct thermal_cooling_device *cdev) { return acpi_thermal_bind_unbind_cdev(thermal, cdev, true); } static int acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, struct thermal_cooling_device *cdev) { return acpi_thermal_bind_unbind_cdev(thermal, cdev, false); } static struct thermal_zone_device_ops acpi_thermal_zone_ops = { .bind = acpi_thermal_bind_cooling_device, .unbind = acpi_thermal_unbind_cooling_device, .get_temp = thermal_get_temp, .get_trend = thermal_get_trend, .hot = acpi_thermal_zone_device_hot, .critical = acpi_thermal_zone_device_critical, }; static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz) { struct device *tzdev = thermal_zone_device(tz->thermal_zone); int ret; ret = sysfs_create_link(&tz->device->dev.kobj, &tzdev->kobj, "thermal_zone"); if (ret) return ret; ret = sysfs_create_link(&tzdev->kobj, &tz->device->dev.kobj, "device"); if (ret) sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); return ret; } static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz) { struct device *tzdev = thermal_zone_device(tz->thermal_zone); sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); sysfs_remove_link(&tzdev->kobj, "device"); } static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz, unsigned int trip_count, int passive_delay) { int result; tz->thermal_zone = thermal_zone_device_register_with_trips("acpitz", tz->trip_table, trip_count, 0, tz, &acpi_thermal_zone_ops, NULL, passive_delay, tz->polling_frequency * 100); if (IS_ERR(tz->thermal_zone)) return PTR_ERR(tz->thermal_zone); result = acpi_thermal_zone_sysfs_add(tz); if (result) goto unregister_tzd; result = thermal_zone_device_enable(tz->thermal_zone); if (result) goto remove_links; dev_info(&tz->device->dev, "registered as thermal_zone%d\n", thermal_zone_device_id(tz->thermal_zone)); return 0; remove_links: acpi_thermal_zone_sysfs_remove(tz); unregister_tzd: thermal_zone_device_unregister(tz->thermal_zone); return result; } static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) { thermal_zone_device_disable(tz->thermal_zone); acpi_thermal_zone_sysfs_remove(tz); thermal_zone_device_unregister(tz->thermal_zone); tz->thermal_zone = NULL; } /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data) { struct acpi_device *device = data; struct acpi_thermal *tz = acpi_driver_data(device); if (!tz) return; switch (event) { case ACPI_THERMAL_NOTIFY_TEMPERATURE: acpi_queue_thermal_check(tz); break; case ACPI_THERMAL_NOTIFY_THRESHOLDS: case ACPI_THERMAL_NOTIFY_DEVICES: acpi_thermal_trips_update(tz, event); break; default: acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", event); break; } } /* * On some platforms, the AML code has dependency about * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx. * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after * /_CRT/_HOT/_PSV/_ACx, or else system will be power off. * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0 * if _TMP has never been evaluated. * * As this dependency is totally transparent to OS, evaluate * all of them once, in the order of _CRT/_HOT/_PSV/_ACx, * _TMP, before they are actually used. */ static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz) { acpi_handle handle = tz->device->handle; unsigned long long value; int i; acpi_evaluate_integer(handle, "_CRT", NULL, &value); acpi_evaluate_integer(handle, "_HOT", NULL, &value); acpi_evaluate_integer(handle, "_PSV", NULL, &value); for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; acpi_status status; status = acpi_evaluate_integer(handle, name, NULL, &value); if (status == AE_NOT_FOUND) break; } acpi_evaluate_integer(handle, "_TMP", NULL, &value); } /* * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI * handles temperature values with a single decimal place. As a consequence, * some implementations use an offset of 273.1 and others use an offset of * 273.2. Try to find out which one is being used, to present the most * accurate and visually appealing number. * * The heuristic below should work for all ACPI thermal zones which have a * critical trip point with a value being a multiple of 0.5 degree Celsius. */ static void acpi_thermal_guess_offset(struct acpi_thermal *tz, long crit_temp) { if (crit_temp != THERMAL_TEMP_INVALID && crit_temp % 5 == 1) tz->kelvin_offset = 273100; else tz->kelvin_offset = 273200; } static void acpi_thermal_check_fn(struct work_struct *work) { struct acpi_thermal *tz = container_of(work, struct acpi_thermal, thermal_check_work); /* * In general, it is not sufficient to check the pending bit, because * subsequent instances of this function may be queued after one of them * has started running (e.g. if _TMP sleeps). Avoid bailing out if just * one of them is running, though, because it may have done the actual * check some time ago, so allow at least one of them to block on the * mutex while another one is running the update. */ if (!refcount_dec_not_one(&tz->thermal_check_count)) return; mutex_lock(&tz->thermal_check_lock); thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED); refcount_inc(&tz->thermal_check_count); mutex_unlock(&tz->thermal_check_lock); } static void acpi_thermal_free_thermal_zone(struct acpi_thermal *tz) { int i; acpi_handle_list_free(&tz->trips.passive.trip.devices); for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) acpi_handle_list_free(&tz->trips.active[i].trip.devices); kfree(tz); } static int acpi_thermal_add(struct acpi_device *device) { struct acpi_thermal_trip *acpi_trip; struct thermal_trip *trip; struct acpi_thermal *tz; unsigned int trip_count; int crit_temp, hot_temp; int passive_delay = 0; int result; int i; if (!device) return -EINVAL; tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL); if (!tz) return -ENOMEM; tz->device = device; strcpy(tz->name, device->pnp.bus_id); strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); device->driver_data = tz; acpi_thermal_aml_dependency_fix(tz); /* Get trip points [_CRT, _PSV, etc.] (required). */ trip_count = acpi_thermal_get_trip_points(tz); crit_temp = acpi_thermal_get_critical_trip(tz); if (crit_temp != THERMAL_TEMP_INVALID) trip_count++; hot_temp = acpi_thermal_get_hot_trip(tz); if (hot_temp != THERMAL_TEMP_INVALID) trip_count++; if (!trip_count) { pr_warn(FW_BUG "No valid trip points!\n"); result = -ENODEV; goto free_memory; } /* Get temperature [_TMP] (required). */ result = acpi_thermal_get_temperature(tz); if (result) goto free_memory; /* Set the cooling mode [_SCP] to active cooling. */ acpi_execute_simple_method(tz->device->handle, "_SCP", ACPI_THERMAL_MODE_ACTIVE); /* Determine the default polling frequency [_TZP]. */ if (tzp) tz->polling_frequency = tzp; else acpi_thermal_get_polling_frequency(tz); acpi_thermal_guess_offset(tz, crit_temp); trip = kcalloc(trip_count, sizeof(*trip), GFP_KERNEL); if (!trip) { result = -ENOMEM; goto free_memory; } tz->trip_table = trip; if (crit_temp != THERMAL_TEMP_INVALID) { trip->type = THERMAL_TRIP_CRITICAL; trip->temperature = acpi_thermal_temp(tz, crit_temp); trip++; } if (hot_temp != THERMAL_TEMP_INVALID) { trip->type = THERMAL_TRIP_HOT; trip->temperature = acpi_thermal_temp(tz, hot_temp); trip++; } acpi_trip = &tz->trips.passive.trip; if (acpi_thermal_trip_valid(acpi_trip)) { passive_delay = tz->trips.passive.tsp * 100; trip->type = THERMAL_TRIP_PASSIVE; trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk); trip->priv = acpi_trip; trip++; } for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { acpi_trip = &tz->trips.active[i].trip; if (!acpi_thermal_trip_valid(acpi_trip)) break; trip->type = THERMAL_TRIP_ACTIVE; trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk); trip->priv = acpi_trip; trip++; } result = acpi_thermal_register_thermal_zone(tz, trip_count, passive_delay); if (result) goto free_trips; refcount_set(&tz->thermal_check_count, 3); mutex_init(&tz->thermal_check_lock); INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn); pr_info("%s [%s] (%ld C)\n", acpi_device_name(device), acpi_device_bid(device), deci_kelvin_to_celsius(tz->temp_dk)); result = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY, acpi_thermal_notify, device); if (result) goto flush_wq; return 0; flush_wq: flush_workqueue(acpi_thermal_pm_queue); acpi_thermal_unregister_thermal_zone(tz); free_trips: kfree(tz->trip_table); free_memory: acpi_thermal_free_thermal_zone(tz); return result; } static void acpi_thermal_remove(struct acpi_device *device) { struct acpi_thermal *tz; if (!device || !acpi_driver_data(device)) return; tz = acpi_driver_data(device); acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY, acpi_thermal_notify); flush_workqueue(acpi_thermal_pm_queue); acpi_thermal_unregister_thermal_zone(tz); kfree(tz->trip_table); acpi_thermal_free_thermal_zone(tz); } #ifdef CONFIG_PM_SLEEP static int acpi_thermal_suspend(struct device *dev) { /* Make sure the previously queued thermal check work has been done */ flush_workqueue(acpi_thermal_pm_queue); return 0; } static int acpi_thermal_resume(struct device *dev) { struct acpi_thermal *tz; int i, j, power_state; if (!dev) return -EINVAL; tz = acpi_driver_data(to_acpi_device(dev)); if (!tz) return -EINVAL; for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { struct acpi_thermal_trip *acpi_trip = &tz->trips.active[i].trip; if (!acpi_thermal_trip_valid(acpi_trip)) break; for (j = 0; j < acpi_trip->devices.count; j++) { acpi_bus_update_power(acpi_trip->devices.handles[j], &power_state); } } acpi_queue_thermal_check(tz); return AE_OK; } #else #define acpi_thermal_suspend NULL #define acpi_thermal_resume NULL #endif static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume); static const struct acpi_device_id thermal_device_ids[] = { {ACPI_THERMAL_HID, 0}, {"", 0}, }; MODULE_DEVICE_TABLE(acpi, thermal_device_ids); static struct acpi_driver acpi_thermal_driver = { .name = "thermal", .class = ACPI_THERMAL_CLASS, .ids = thermal_device_ids, .ops = { .add = acpi_thermal_add, .remove = acpi_thermal_remove, }, .drv.pm = &acpi_thermal_pm, }; static int thermal_act(const struct dmi_system_id *d) { if (act == 0) { pr_notice("%s detected: disabling all active thermal trip points\n", d->ident); act = -1; } return 0; } static int thermal_nocrt(const struct dmi_system_id *d) { pr_notice("%s detected: disabling all critical thermal trip point actions.\n", d->ident); crt = -1; return 0; } static int thermal_tzp(const struct dmi_system_id *d) { if (tzp == 0) { pr_notice("%s detected: enabling thermal zone polling\n", d->ident); tzp = 300; /* 300 dS = 30 Seconds */ } return 0; } static int thermal_psv(const struct dmi_system_id *d) { if (psv == 0) { pr_notice("%s detected: disabling all passive thermal trip points\n", d->ident); psv = -1; } return 0; } static const struct dmi_system_id thermal_dmi_table[] __initconst = { /* * Award BIOS on this AOpen makes thermal control almost worthless. * http://bugzilla.kernel.org/show_bug.cgi?id=8842 */ { .callback = thermal_act, .ident = "AOpen i915GMm-HFS", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), }, }, { .callback = thermal_psv, .ident = "AOpen i915GMm-HFS", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), }, }, { .callback = thermal_tzp, .ident = "AOpen i915GMm-HFS", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"), DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"), }, }, { .callback = thermal_nocrt, .ident = "Gigabyte GA-7ZX", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."), DMI_MATCH(DMI_BOARD_NAME, "7ZX"), }, }, {} }; static int __init acpi_thermal_init(void) { int result; dmi_check_system(thermal_dmi_table); if (off) { pr_notice("thermal control disabled\n"); return -ENODEV; } acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm", WQ_HIGHPRI | WQ_MEM_RECLAIM, 0); if (!acpi_thermal_pm_queue) return -ENODEV; result = acpi_bus_register_driver(&acpi_thermal_driver); if (result < 0) { destroy_workqueue(acpi_thermal_pm_queue); return -ENODEV; } return 0; } static void __exit acpi_thermal_exit(void) { acpi_bus_unregister_driver(&acpi_thermal_driver); destroy_workqueue(acpi_thermal_pm_queue); } module_init(acpi_thermal_init); module_exit(acpi_thermal_exit); MODULE_AUTHOR("Paul Diefenbaugh"); MODULE_DESCRIPTION("ACPI Thermal Zone Driver"); MODULE_LICENSE("GPL");
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