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Diffstat (limited to '')
| -rw-r--r-- | drivers/acpi/thermal.c | 1156 |
1 files changed, 1156 insertions, 0 deletions
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c new file mode 100644 index 0000000000..8263508415 --- /dev/null +++ b/drivers/acpi/thermal.c @@ -0,0 +1,1156 @@ +// 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 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 temperature; + bool valid; +}; + +struct acpi_thermal_passive { + struct acpi_thermal_trip trip; + struct acpi_handle_list devices; + unsigned long tc1; + unsigned long tc2; + unsigned long tsp; +}; + +struct acpi_thermal_active { + struct acpi_thermal_trip trip; + struct acpi_handle_list devices; +}; + +struct acpi_thermal_trips { + struct acpi_thermal_trip critical; + struct acpi_thermal_trip 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 thermal_trip *trip_table; + 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_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 void __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.trip.valid) || + flag == ACPI_TRIPS_INIT) { + valid = tz->trips.passive.trip.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.trip.valid = false; + } else { + tz->trips.passive.trip.temperature = tmp; + tz->trips.passive.trip.valid = true; + if (flag == ACPI_TRIPS_INIT) { + status = acpi_evaluate_integer(tz->device->handle, + "_TC1", NULL, &tmp); + if (ACPI_FAILURE(status)) + tz->trips.passive.trip.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.trip.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.trip.valid = false; + else + tz->trips.passive.tsp = tmp; + } + } + } + if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.trip.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.trip.valid = false; + } else { + tz->trips.passive.trip.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.trip.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].trip.valid; + + if (act == -1) + break; /* disable all active trip points */ + + if (flag == ACPI_TRIPS_INIT || ((flag & ACPI_TRIPS_ACTIVE) && + tz->trips.active[i].trip.valid)) { + status = acpi_evaluate_integer(tz->device->handle, + name, NULL, &tmp); + if (ACPI_FAILURE(status)) { + tz->trips.active[i].trip.valid = false; + if (i == 0) + break; + + if (act <= 0) + break; + + if (i == 1) + tz->trips.active[0].trip.temperature = + celsius_to_deci_kelvin(act); + else + /* + * Don't allow override higher than + * the next higher trip point + */ + tz->trips.active[i-1].trip.temperature = + min_t(unsigned long, + tz->trips.active[i-2].trip.temperature, + celsius_to_deci_kelvin(act)); + + break; + } else { + tz->trips.active[i].trip.temperature = tmp; + tz->trips.active[i].trip.valid = true; + } + } + + name[2] = 'L'; + if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].trip.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].trip.valid = false; + } else { + tz->trips.active[i].trip.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].trip.valid) + ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state"); + + if (!tz->trips.active[i].trip.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"); + } + } +} + +static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data) +{ + struct acpi_thermal_trip *acpi_trip = trip->priv; + struct acpi_thermal *tz = data; + + if (!acpi_trip) + return 0; + + if (acpi_trip->valid) + trip->temperature = acpi_thermal_temp(tz, acpi_trip->temperature); + else + trip->temperature = THERMAL_TEMP_INVALID; + + return 0; +} + +static void acpi_thermal_adjust_thermal_zone(struct thermal_zone_device *thermal, + unsigned long data) +{ + struct acpi_thermal *tz = thermal_zone_device_priv(thermal); + int flag = data == ACPI_THERMAL_NOTIFY_THRESHOLDS ? + ACPI_TRIPS_THRESHOLDS : ACPI_TRIPS_DEVICES; + + __acpi_thermal_trips_update(tz, flag); + + for_each_thermal_trip(tz->thermal_zone, acpi_thermal_adjust_trip, tz); +} + +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 acpi_device *adev = tz->device; + + /* + * Use thermal_zone_device_exec() 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_device_exec(tz->thermal_zone, + acpi_thermal_adjust_thermal_zone, event); + acpi_queue_thermal_check(tz); + acpi_bus_generate_netlink_event(adev->pnp.device_class, + dev_name(&adev->dev), event, 0); +} + +static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) +{ + bool valid; + int i; + + __acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); + + valid = tz->trips.critical.valid | + tz->trips.hot.valid | + tz->trips.passive.trip.valid; + + for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) + valid = valid || tz->trips.active[i].trip.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_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_trip->valid) + return -EINVAL; + + switch (trip->type) { + case THERMAL_TRIP_PASSIVE: + t = tz->trips.passive.tc1 * (tz->temperature - + tz->last_temperature) + + tz->trips.passive.tc2 * (tz->temperature - + acpi_trip->temperature); + 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->temperature); + 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); +} + +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.trip.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].trip.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_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) +{ + struct acpi_thermal_trip *acpi_trip; + struct thermal_trip *trip; + int passive_delay = 0; + int trip_count = 0; + int result; + int i; + + if (tz->trips.critical.valid) + trip_count++; + + if (tz->trips.hot.valid) + trip_count++; + + if (tz->trips.passive.trip.valid) { + trip_count++; + passive_delay = tz->trips.passive.tsp * 100; + } + + for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].trip.valid; i++) + trip_count++; + + trip = kcalloc(trip_count, sizeof(*trip), GFP_KERNEL); + if (!trip) + return -ENOMEM; + + tz->trip_table = trip; + + if (tz->trips.critical.valid) { + trip->type = THERMAL_TRIP_CRITICAL; + trip->temperature = acpi_thermal_temp(tz, tz->trips.critical.temperature); + trip++; + } + + if (tz->trips.hot.valid) { + trip->type = THERMAL_TRIP_HOT; + trip->temperature = acpi_thermal_temp(tz, tz->trips.hot.temperature); + trip++; + } + + acpi_trip = &tz->trips.passive.trip; + if (acpi_trip->valid) { + trip->type = THERMAL_TRIP_PASSIVE; + trip->temperature = acpi_thermal_temp(tz, acpi_trip->temperature); + trip->priv = acpi_trip; + trip++; + } + + for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { + acpi_trip = &tz->trips.active[i].trip; + + if (!acpi_trip->valid) + break; + + trip->type = THERMAL_TRIP_ACTIVE; + trip->temperature = acpi_thermal_temp(tz, acpi_trip->temperature); + trip->priv = acpi_trip; + trip++; + } + + 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)) { + result = PTR_ERR(tz->thermal_zone); + goto free_trip_table; + } + + 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); +free_trip_table: + kfree(tz->trip_table); + + 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); +} + +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)); + + result = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY, + acpi_thermal_notify); + if (result) + goto flush_wq; + + return 0; + +flush_wq: + flush_workqueue(acpi_thermal_pm_queue); + acpi_thermal_unregister_thermal_zone(tz); +free_memory: + kfree(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); + 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; + + 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].trip.valid) + break; + + for (j = 0; j < tz->trips.active[i].devices.count; j++) { + acpi_bus_update_power(tz->trips.active[i].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"); |