| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Andy Grover | 1771 | 33.84% | 7 | 5.74% |
| Rui Zhang | 1423 | 27.19% | 19 | 15.57% |
| Len Brown | 528 | 10.09% | 16 | 13.11% |
| Rafael J. Wysocki | 288 | 5.50% | 14 | 11.48% |
| Daniel Lezcano | 211 | 4.03% | 5 | 4.10% |
| Matthew Garrett | 174 | 3.32% | 4 | 3.28% |
| Konstantin Karasyov | 155 | 2.96% | 3 | 2.46% |
| Aaron Lu | 112 | 2.14% | 1 | 0.82% |
| Thomas Renninger | 97 | 1.85% | 3 | 2.46% |
| Patrick Mochel | 81 | 1.55% | 3 | 2.46% |
| Matthew Wilcox | 76 | 1.45% | 1 | 0.82% |
| Jean Delvare | 72 | 1.38% | 1 | 0.82% |
| Andrzej Pietrasiewicz | 45 | 0.86% | 3 | 2.46% |
| Andy Shevchenko | 29 | 0.55% | 1 | 0.82% |
| Akinobu Mita | 17 | 0.32% | 1 | 0.82% |
| Linus Torvalds (pre-git) | 16 | 0.31% | 7 | 5.74% |
| Rusty Russell | 14 | 0.27% | 1 | 0.82% |
| Greg Kroah-Hartman | 12 | 0.23% | 1 | 0.82% |
| Kay Sievers | 9 | 0.17% | 1 | 0.82% |
| Peter Feuerer | 8 | 0.15% | 1 | 0.82% |
| Durgadoss R | 8 | 0.15% | 2 | 1.64% |
| Stephen Rothwell | 7 | 0.13% | 1 | 0.82% |
| Jiangshan Yi | 7 | 0.13% | 1 | 0.82% |
| Bhaktipriya Shridhar | 7 | 0.13% | 1 | 0.82% |
| Björn Helgaas | 6 | 0.11% | 1 | 0.82% |
| Shuah Khan | 6 | 0.11% | 1 | 0.82% |
| Sascha Hauer | 5 | 0.10% | 1 | 0.82% |
| Lan Tianyu | 5 | 0.10% | 2 | 1.64% |
| Alexey Y. Starikovskiy | 5 | 0.10% | 1 | 0.82% |
| Aristeu Sergio Rozanski Filho | 4 | 0.08% | 1 | 0.82% |
| Jeff Garzik | 4 | 0.08% | 1 | 0.82% |
| Jiang Liu | 4 | 0.08% | 1 | 0.82% |
| Kapileshwar Singh | 4 | 0.08% | 1 | 0.82% |
| Andrew Morton | 3 | 0.06% | 1 | 0.82% |
| Krzysztof Helt | 3 | 0.06% | 1 | 0.82% |
| Pavel Machek | 2 | 0.04% | 1 | 0.82% |
| Vasily Averin | 2 | 0.04% | 1 | 0.82% |
| Thomas Gleixner | 2 | 0.04% | 1 | 0.82% |
| Arjan van de Ven | 2 | 0.04% | 1 | 0.82% |
| Christoph Hellwig | 2 | 0.04% | 1 | 0.82% |
| Dawei Li | 2 | 0.04% | 1 | 0.82% |
| Linus Torvalds | 2 | 0.04% | 2 | 1.64% |
| Burman Yan | 1 | 0.02% | 1 | 0.82% |
| Adam Buchbinder | 1 | 0.02% | 1 | 0.82% |
| Lv Zheng | 1 | 0.02% | 1 | 0.82% |
| Zhihui Zhang | 1 | 0.02% | 1 | 0.82% |
| Total | 5234 | 122 |
// 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_TRIPS_CRITICAL BIT(0) #define ACPI_TRIPS_HOT BIT(1) #define ACPI_TRIPS_PASSIVE BIT(2) #define ACPI_TRIPS_ACTIVE BIT(3) #define ACPI_TRIPS_DEVICES BIT(4) #define ACPI_TRIPS_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE) #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \ ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \ ACPI_TRIPS_DEVICES) /* * 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(flags, tz, str) \ do { \ if (flags != ACPI_TRIPS_INIT) \ 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 nocrt; module_param(nocrt, int, 0); MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points."); 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_critical { unsigned long temperature; bool valid; }; struct acpi_thermal_hot { unsigned long temperature; bool valid; }; struct acpi_thermal_passive { struct acpi_handle_list devices; unsigned long temperature; unsigned long tc1; unsigned long tc2; unsigned long tsp; bool valid; }; struct acpi_thermal_active { struct acpi_handle_list devices; unsigned long temperature; bool valid; bool enabled; }; struct acpi_thermal_trips { struct acpi_thermal_critical critical; struct acpi_thermal_hot hot; 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 temperature; unsigned long last_temperature; unsigned long polling_frequency; volatile u8 zombie; struct acpi_thermal_trips trips; struct acpi_handle_list devices; 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_temperature = tz->temperature; status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp); if (ACPI_FAILURE(status)) return -ENODEV; tz->temperature = tmp; acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n", tz->temperature); 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_trips_update(struct acpi_thermal *tz, int flag) { acpi_status status; unsigned long long tmp; struct acpi_handle_list devices; bool valid = false; int i; /* Critical Shutdown */ if (flag & ACPI_TRIPS_CRITICAL) { status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL, &tmp); tz->trips.critical.temperature = tmp; /* * Treat freezing temperatures as invalid as well; some * BIOSes return really low values and cause reboots at startup. * Below zero (Celsius) values clearly aren't right for sure.. * ... so lets discard those as invalid. */ if (ACPI_FAILURE(status)) { tz->trips.critical.valid = false; acpi_handle_debug(tz->device->handle, "No critical threshold\n"); } else if (tmp <= 2732) { pr_info(FW_BUG "Invalid critical threshold (%llu)\n", tmp); tz->trips.critical.valid = false; } else { tz->trips.critical.valid = true; acpi_handle_debug(tz->device->handle, "Found critical threshold [%lu]\n", tz->trips.critical.temperature); } if (tz->trips.critical.valid) { if (crt == -1) { tz->trips.critical.valid = false; } else if (crt > 0) { unsigned long crt_k = celsius_to_deci_kelvin(crt); /* * Allow override critical threshold */ if (crt_k > tz->trips.critical.temperature) pr_info("Critical threshold %d C\n", crt); tz->trips.critical.temperature = crt_k; } } } /* Critical Sleep (optional) */ if (flag & ACPI_TRIPS_HOT) { status = acpi_evaluate_integer(tz->device->handle, "_HOT", NULL, &tmp); if (ACPI_FAILURE(status)) { tz->trips.hot.valid = false; acpi_handle_debug(tz->device->handle, "No hot threshold\n"); } else { tz->trips.hot.temperature = tmp; tz->trips.hot.valid = true; acpi_handle_debug(tz->device->handle, "Found hot threshold [%lu]\n", tz->trips.hot.temperature); } } /* Passive (optional) */ if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.valid) || flag == ACPI_TRIPS_INIT) { valid = tz->trips.passive.valid; if (psv == -1) { status = AE_SUPPORT; } else if (psv > 0) { tmp = celsius_to_deci_kelvin(psv); status = AE_OK; } else { status = acpi_evaluate_integer(tz->device->handle, "_PSV", NULL, &tmp); } if (ACPI_FAILURE(status)) { tz->trips.passive.valid = false; } else { tz->trips.passive.temperature = tmp; tz->trips.passive.valid = true; if (flag == ACPI_TRIPS_INIT) { status = acpi_evaluate_integer(tz->device->handle, "_TC1", NULL, &tmp); if (ACPI_FAILURE(status)) tz->trips.passive.valid = false; else tz->trips.passive.tc1 = tmp; status = acpi_evaluate_integer(tz->device->handle, "_TC2", NULL, &tmp); if (ACPI_FAILURE(status)) tz->trips.passive.valid = false; else tz->trips.passive.tc2 = tmp; status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp); if (ACPI_FAILURE(status)) tz->trips.passive.valid = false; else tz->trips.passive.tsp = tmp; } } } if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.valid) { memset(&devices, 0, sizeof(struct acpi_handle_list)); status = acpi_evaluate_reference(tz->device->handle, "_PSL", NULL, &devices); if (ACPI_FAILURE(status)) { acpi_handle_info(tz->device->handle, "Invalid passive threshold\n"); tz->trips.passive.valid = false; } else { tz->trips.passive.valid = true; } if (memcmp(&tz->trips.passive.devices, &devices, sizeof(struct acpi_handle_list))) { memcpy(&tz->trips.passive.devices, &devices, sizeof(struct acpi_handle_list)); ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device"); } } if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) { if (valid != tz->trips.passive.valid) ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state"); } /* Active (optional) */ for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; valid = tz->trips.active[i].valid; if (act == -1) break; /* disable all active trip points */ if (flag == ACPI_TRIPS_INIT || ((flag & ACPI_TRIPS_ACTIVE) && tz->trips.active[i].valid)) { status = acpi_evaluate_integer(tz->device->handle, name, NULL, &tmp); if (ACPI_FAILURE(status)) { tz->trips.active[i].valid = false; if (i == 0) break; if (act <= 0) break; if (i == 1) tz->trips.active[0].temperature = celsius_to_deci_kelvin(act); else /* * Don't allow override higher than * the next higher trip point */ tz->trips.active[i-1].temperature = min_t(unsigned long, tz->trips.active[i-2].temperature, celsius_to_deci_kelvin(act)); break; } else { tz->trips.active[i].temperature = tmp; tz->trips.active[i].valid = true; } } name[2] = 'L'; if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].valid) { memset(&devices, 0, sizeof(struct acpi_handle_list)); status = acpi_evaluate_reference(tz->device->handle, name, NULL, &devices); if (ACPI_FAILURE(status)) { acpi_handle_info(tz->device->handle, "Invalid active%d threshold\n", i); tz->trips.active[i].valid = false; } else { tz->trips.active[i].valid = true; } if (memcmp(&tz->trips.active[i].devices, &devices, sizeof(struct acpi_handle_list))) { memcpy(&tz->trips.active[i].devices, &devices, sizeof(struct acpi_handle_list)); ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device"); } } if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES)) if (valid != tz->trips.active[i].valid) ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state"); if (!tz->trips.active[i].valid) break; } if (flag & ACPI_TRIPS_DEVICES) { memset(&devices, 0, sizeof(devices)); status = acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &devices); if (ACPI_SUCCESS(status) && memcmp(&tz->devices, &devices, sizeof(devices))) { tz->devices = devices; ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device"); } } return 0; } static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) { int i, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); bool valid; if (ret) return ret; valid = tz->trips.critical.valid | tz->trips.hot.valid | tz->trips.passive.valid; for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) valid = valid || tz->trips.active[i].valid; if (!valid) { pr_warn(FW_BUG "No valid trip found\n"); return -ENODEV; } return 0; } /* 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->temperature, tz->kelvin_offset); return 0; } static int thermal_get_trip_type(struct thermal_zone_device *thermal, int trip, enum thermal_trip_type *type) { struct acpi_thermal *tz = thermal_zone_device_priv(thermal); int i; if (!tz || trip < 0) return -EINVAL; if (tz->trips.critical.valid) { if (!trip) { *type = THERMAL_TRIP_CRITICAL; return 0; } trip--; } if (tz->trips.hot.valid) { if (!trip) { *type = THERMAL_TRIP_HOT; return 0; } trip--; } if (tz->trips.passive.valid) { if (!trip) { *type = THERMAL_TRIP_PASSIVE; return 0; } trip--; } for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].valid; i++) { if (!trip) { *type = THERMAL_TRIP_ACTIVE; return 0; } trip--; } return -EINVAL; } static int thermal_get_trip_temp(struct thermal_zone_device *thermal, int trip, int *temp) { struct acpi_thermal *tz = thermal_zone_device_priv(thermal); int i; if (!tz || trip < 0) return -EINVAL; if (tz->trips.critical.valid) { if (!trip) { *temp = deci_kelvin_to_millicelsius_with_offset( tz->trips.critical.temperature, tz->kelvin_offset); return 0; } trip--; } if (tz->trips.hot.valid) { if (!trip) { *temp = deci_kelvin_to_millicelsius_with_offset( tz->trips.hot.temperature, tz->kelvin_offset); return 0; } trip--; } if (tz->trips.passive.valid) { if (!trip) { *temp = deci_kelvin_to_millicelsius_with_offset( tz->trips.passive.temperature, tz->kelvin_offset); return 0; } trip--; } for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].valid; i++) { if (!trip) { *temp = deci_kelvin_to_millicelsius_with_offset( tz->trips.active[i].temperature, tz->kelvin_offset); return 0; } trip--; } return -EINVAL; } static int thermal_get_crit_temp(struct thermal_zone_device *thermal, int *temperature) { struct acpi_thermal *tz = thermal_zone_device_priv(thermal); if (tz->trips.critical.valid) { *temperature = deci_kelvin_to_millicelsius_with_offset( tz->trips.critical.temperature, tz->kelvin_offset); return 0; } return -EINVAL; } static int thermal_get_trend(struct thermal_zone_device *thermal, int trip, enum thermal_trend *trend) { struct acpi_thermal *tz = thermal_zone_device_priv(thermal); enum thermal_trip_type type; int i; if (thermal_get_trip_type(thermal, trip, &type)) return -EINVAL; if (type == THERMAL_TRIP_ACTIVE) { int trip_temp; int temp = deci_kelvin_to_millicelsius_with_offset( tz->temperature, tz->kelvin_offset); if (thermal_get_trip_temp(thermal, trip, &trip_temp)) return -EINVAL; if (temp > trip_temp) { *trend = THERMAL_TREND_RAISING; return 0; } else { /* Fall back on default trend */ return -EINVAL; } } /* * tz->temperature has already been updated by generic thermal layer, * before this callback being invoked */ i = tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature) + tz->trips.passive.tc2 * (tz->temperature - tz->trips.passive.temperature); if (i > 0) *trend = THERMAL_TREND_RAISING; else if (i < 0) *trend = THERMAL_TREND_DROPPING; else *trend = THERMAL_TREND_STABLE; return 0; } 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); } static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, struct thermal_cooling_device *cdev, bool bind) { struct acpi_device *device = cdev->devdata; struct acpi_thermal *tz = thermal_zone_device_priv(thermal); struct acpi_device *dev; acpi_handle handle; int i; int j; int trip = -1; int result = 0; if (tz->trips.critical.valid) trip++; if (tz->trips.hot.valid) trip++; if (tz->trips.passive.valid) { trip++; for (i = 0; i < tz->trips.passive.devices.count; i++) { handle = tz->trips.passive.devices.handles[i]; dev = acpi_fetch_acpi_dev(handle); if (dev != device) continue; if (bind) result = thermal_zone_bind_cooling_device( thermal, trip, cdev, THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, THERMAL_WEIGHT_DEFAULT); else result = thermal_zone_unbind_cooling_device( thermal, trip, cdev); if (result) goto failed; } } for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { if (!tz->trips.active[i].valid) break; trip++; for (j = 0; j < tz->trips.active[i].devices.count; j++) { handle = tz->trips.active[i].devices.handles[j]; dev = acpi_fetch_acpi_dev(handle); if (dev != device) continue; if (bind) result = thermal_zone_bind_cooling_device( thermal, trip, cdev, THERMAL_NO_LIMIT, THERMAL_NO_LIMIT, THERMAL_WEIGHT_DEFAULT); else result = thermal_zone_unbind_cooling_device( thermal, trip, cdev); if (result) goto failed; } } failed: return result; } static int acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal, struct thermal_cooling_device *cdev) { return acpi_thermal_cooling_device_cb(thermal, cdev, true); } static int acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal, struct thermal_cooling_device *cdev) { return acpi_thermal_cooling_device_cb(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_trip_type = thermal_get_trip_type, .get_trip_temp = thermal_get_trip_temp, .get_crit_temp = thermal_get_crit_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) { int trips = 0; int result; acpi_status status; int i; if (tz->trips.critical.valid) trips++; if (tz->trips.hot.valid) trips++; if (tz->trips.passive.valid) trips++; for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].valid; i++, trips++); if (tz->trips.passive.valid) tz->thermal_zone = thermal_zone_device_register("acpitz", trips, 0, tz, &acpi_thermal_zone_ops, NULL, tz->trips.passive.tsp * 100, tz->polling_frequency * 100); else tz->thermal_zone = thermal_zone_device_register("acpitz", trips, 0, tz, &acpi_thermal_zone_ops, NULL, 0, tz->polling_frequency * 100); if (IS_ERR(tz->thermal_zone)) return -ENODEV; result = acpi_thermal_zone_sysfs_add(tz); if (result) goto unregister_tzd; status = acpi_bus_attach_private_data(tz->device->handle, tz->thermal_zone); if (ACPI_FAILURE(status)) { result = -ENODEV; goto remove_links; } result = thermal_zone_device_enable(tz->thermal_zone); if (result) goto acpi_bus_detach; dev_info(&tz->device->dev, "registered as thermal_zone%d\n", thermal_zone_device_id(tz->thermal_zone)); return 0; acpi_bus_detach: acpi_bus_detach_private_data(tz->device->handle); 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) { acpi_thermal_zone_sysfs_remove(tz); thermal_zone_device_unregister(tz->thermal_zone); tz->thermal_zone = NULL; acpi_bus_detach_private_data(tz->device->handle); } /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ 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_notify(struct acpi_device *device, u32 event) { 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: acpi_thermal_trips_update(tz, ACPI_TRIPS_THRESHOLDS); acpi_queue_thermal_check(tz); acpi_bus_generate_netlink_event(device->pnp.device_class, dev_name(&device->dev), event, 0); break; case ACPI_THERMAL_NOTIFY_DEVICES: acpi_thermal_trips_update(tz, ACPI_TRIPS_DEVICES); acpi_queue_thermal_check(tz); acpi_bus_generate_netlink_event(device->pnp.device_class, dev_name(&device->dev), event, 0); 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); } static int acpi_thermal_get_info(struct acpi_thermal *tz) { int result; if (!tz) return -EINVAL; acpi_thermal_aml_dependency_fix(tz); /* Get trip points [_CRT, _PSV, etc.] (required) */ result = acpi_thermal_get_trip_points(tz); if (result) return result; /* Get temperature [_TMP] (required) */ result = acpi_thermal_get_temperature(tz); if (result) return result; /* Set the cooling mode [_SCP] to active cooling (default) */ acpi_execute_simple_method(tz->device->handle, "_SCP", ACPI_THERMAL_MODE_ACTIVE); /* Get default polling frequency [_TZP] (optional) */ if (tzp) tz->polling_frequency = tzp; else acpi_thermal_get_polling_frequency(tz); return 0; } /* * 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) { if (tz->trips.critical.valid && (tz->trips.critical.temperature % 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 int acpi_thermal_add(struct acpi_device *device) { struct acpi_thermal *tz; int result; 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; result = acpi_thermal_get_info(tz); if (result) goto free_memory; acpi_thermal_guess_offset(tz); result = acpi_thermal_register_thermal_zone(tz); if (result) goto free_memory; 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->temperature)); goto end; free_memory: kfree(tz); end: return result; } static void acpi_thermal_remove(struct acpi_device *device) { struct acpi_thermal *tz; if (!device || !acpi_driver_data(device)) return; flush_workqueue(acpi_thermal_pm_queue); tz = acpi_driver_data(device); acpi_thermal_unregister_thermal_zone(tz); kfree(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, result; 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++) { if (!tz->trips.active[i].valid) break; tz->trips.active[i].enabled = true; for (j = 0; j < tz->trips.active[i].devices.count; j++) { result = acpi_bus_update_power( tz->trips.active[i].devices.handles[j], &power_state); if (result || (power_state != ACPI_STATE_D0)) { tz->trips.active[i].enabled = false; break; } } } 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, .notify = acpi_thermal_notify, }, .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); nocrt = 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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