diff options
Diffstat (limited to 'drivers/acpi/thermal.c')
| -rw-r--r-- | drivers/acpi/thermal.c | 1053 |
1 files changed, 1053 insertions, 0 deletions
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c new file mode 100644 index 000000000..dd7666c17 --- /dev/null +++ b/drivers/acpi/thermal.c @@ -0,0 +1,1053 @@ +// 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/platform_device.h> +#include <linux/thermal.h> +#include <linux/acpi.h> +#include <linux/workqueue.h> +#include <linux/uaccess.h> +#include <linux/units.h> + +#include "internal.h" + +#define ACPI_THERMAL_CLASS "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) + +#define ACPI_THERMAL_MAX_NR_TRIPS (ACPI_THERMAL_MAX_ACTIVE + 3) + +/* + * 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 delay; +}; + +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_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) +{ + int temp; + + if (temp_deci_k == THERMAL_TEMP_INVALID) + return THERMAL_TEMP_INVALID; + + temp = deci_kelvin_to_millicelsius_with_offset(temp_deci_k, + tz->kelvin_offset); + if (temp <= 0) + return THERMAL_TEMP_INVALID; + + return temp; +} + +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) +{ + int temp; + + if (acpi_passive_trip_temp(tz->device, &temp)) + return THERMAL_TEMP_INVALID; + + return temp; +} + +static long get_active_temp(struct acpi_thermal *tz, int index) +{ + int temp; + + if (acpi_active_trip_temp(tz->device, index, &temp)) + 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 (temp > override) + return override; + } + return temp; +} + +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"; + + if (index != ACPI_THERMAL_TRIP_PASSIVE) { + method[1] = 'A'; + method[2] = 'L'; + method[3] = '0' + index; + } + + if (!acpi_evaluate_reference(tz->device->handle, method, NULL, &devices)) { + 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; + int temp; + + 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)) + temp = acpi_thermal_temp(tz, acpi_trip->temp_dk); + else + temp = THERMAL_TEMP_INVALID; + + thermal_zone_set_trip_temp(tz->thermal_zone, trip, temp); + + 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(ACPI_THERMAL_CLASS, + dev_name(&adev->dev), event, 0); +} + +static int acpi_thermal_get_critical_trip(struct acpi_thermal *tz) +{ + int temp; + + if (crt > 0) { + temp = celsius_to_deci_kelvin(crt); + goto set; + } + if (crt == -1) { + acpi_handle_debug(tz->device->handle, "Critical threshold disabled\n"); + return THERMAL_TEMP_INVALID; + } + + if (acpi_critical_trip_temp(tz->device, &temp)) + return THERMAL_TEMP_INVALID; + + if (temp <= 2732) { + /* + * Below zero (Celsius) values clearly aren't right for sure, + * so discard them as invalid. + */ + pr_info(FW_BUG "Invalid critical threshold (%d)\n", temp); + return THERMAL_TEMP_INVALID; + } + +set: + acpi_handle_debug(tz->device->handle, "Critical threshold [%d]\n", temp); + return temp; +} + +static int acpi_thermal_get_hot_trip(struct acpi_thermal *tz) +{ + int temp; + + if (acpi_hot_trip_temp(tz->device, &temp) || temp == THERMAL_TEMP_INVALID) { + acpi_handle_debug(tz->device->handle, "No hot threshold\n"); + return THERMAL_TEMP_INVALID; + } + + acpi_handle_debug(tz->device->handle, "Hot threshold [%d]\n", temp); + return temp; +} + +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, "_TFP", NULL, &tmp); + if (ACPI_SUCCESS(status)) { + tz->trips.passive.delay = tmp; + return true; + } + + status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp); + if (ACPI_FAILURE(status)) + return false; + + tz->trips.passive.delay = tmp * 100; + + 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 void acpi_thermal_get_trip_points(struct acpi_thermal *tz) +{ + int i; + + acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE); + + for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { + if (!acpi_thermal_init_trip(tz, i)) + break; + } + + while (++i < ACPI_THERMAL_MAX_ACTIVE) + tz->trips.active[i].trip.temp_dk = THERMAL_TEMP_INVALID; +} + +/* 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(ACPI_THERMAL_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(ACPI_THERMAL_CLASS, + dev_name(&tz->device->dev), + ACPI_THERMAL_NOTIFY_CRITICAL, 1); + + thermal_zone_device_critical(thermal); +} + +static bool acpi_thermal_should_bind_cdev(struct thermal_zone_device *thermal, + const struct thermal_trip *trip, + struct thermal_cooling_device *cdev, + struct cooling_spec *c) +{ + struct acpi_thermal_trip *acpi_trip = trip->priv; + struct acpi_device *cdev_adev = cdev->devdata; + int i; + + /* Skip critical and hot trips. */ + if (!acpi_trip) + return false; + + for (i = 0; i < acpi_trip->devices.count; i++) { + acpi_handle handle = acpi_trip->devices.handles[i]; + + if (acpi_fetch_acpi_dev(handle) == cdev_adev) + return true; + } + + return false; +} + +static const struct thermal_zone_device_ops acpi_thermal_zone_ops = { + .should_bind = acpi_thermal_should_bind_cdev, + .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, + const struct thermal_trip *trip_table, + unsigned int trip_count, + int passive_delay) +{ + int result; + + if (trip_count) + tz->thermal_zone = thermal_zone_device_register_with_trips( + "acpitz", trip_table, trip_count, tz, + &acpi_thermal_zone_ops, NULL, passive_delay, + tz->polling_frequency * 100); + else + tz->thermal_zone = thermal_tripless_zone_device_register( + "acpitz", tz, &acpi_thermal_zone_ops, NULL); + + 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_zone_unregister(void *data) +{ + struct acpi_thermal *tz = data; + + flush_workqueue(acpi_thermal_pm_queue); + + 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_thermal *tz = data; + + 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(tz->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_zone_free(void *data) +{ + struct acpi_thermal *tz = data; + 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_probe(struct platform_device *pdev) +{ + struct thermal_trip trip_table[ACPI_THERMAL_MAX_NR_TRIPS] = { 0 }; + struct device *dev = &pdev->dev; + struct acpi_device *device = ACPI_COMPANION(dev); + struct acpi_thermal_trip *acpi_trip; + struct thermal_trip *trip; + struct acpi_thermal *tz; + int crit_temp, hot_temp; + int passive_delay = 0; + int result; + int i; + + if (!device) + return -ENODEV; + + tz = kzalloc_obj(struct acpi_thermal); + if (!tz) + return -ENOMEM; + + result = devm_add_action_or_reset(dev, acpi_thermal_zone_free, tz); + if (result) + return result; + + platform_set_drvdata(pdev, tz); + + tz->device = device; + strscpy(tz->name, device->pnp.bus_id); + + acpi_thermal_aml_dependency_fix(tz); + + /* + * Set the cooling mode [_SCP] to active cooling. This needs to happen before + * we retrieve the trip point values. + */ + acpi_execute_simple_method(tz->device->handle, "_SCP", ACPI_THERMAL_MODE_ACTIVE); + + /* Get trip points [_ACi, _PSV, etc.] (required). */ + acpi_thermal_get_trip_points(tz); + + crit_temp = acpi_thermal_get_critical_trip(tz); + hot_temp = acpi_thermal_get_hot_trip(tz); + + /* Get temperature [_TMP] (required). */ + result = acpi_thermal_get_temperature(tz); + if (result) + return result; + + /* 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 = trip_table; + + 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.delay; + + 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++; + } + + if (trip == trip_table) + pr_warn(FW_BUG "No valid trip points!\n"); + + result = acpi_thermal_register_thermal_zone(tz, trip_table, + trip - trip_table, + passive_delay); + if (result) + return result; + + result = devm_add_action_or_reset(dev, acpi_thermal_zone_unregister, tz); + if (result) + return result; + + 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("Thermal Zone [%s] (%ld C)\n", acpi_device_bid(device), + deci_kelvin_to_celsius(tz->temp_dk)); + + return devm_acpi_install_notify_handler(dev, ACPI_DEVICE_NOTIFY, + acpi_thermal_notify, tz); +} + +#ifdef CONFIG_PM_SLEEP +static int acpi_thermal_prepare(struct device *dev) +{ + /* Make sure the previously queued thermal check work has been done */ + flush_workqueue(acpi_thermal_pm_queue); + return 0; +} + +static void acpi_thermal_complete(struct device *dev) +{ + acpi_queue_thermal_check(dev_get_drvdata(dev)); +} + +static const struct dev_pm_ops acpi_thermal_pm_ops = { + .prepare = acpi_thermal_prepare, + .complete = acpi_thermal_complete, +}; +#define ACPI_THERMAL_PM &acpi_thermal_pm_ops +#else /* !CONFIG_PM_SLEEP */ +#define ACPI_THERMAL_PM NULL +#endif /* CONFIG_PM_SLEEP */ + +static const struct acpi_device_id thermal_device_ids[] = { + {ACPI_THERMAL_HID, 0}, + {"", 0}, +}; +MODULE_DEVICE_TABLE(acpi, thermal_device_ids); + +static struct platform_driver acpi_thermal_driver = { + .probe = acpi_thermal_probe, + .driver = { + .name = "acpi-thermal", + .acpi_match_table = thermal_device_ids, + .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 | WQ_PERCPU, + 0); + if (!acpi_thermal_pm_queue) + return -ENODEV; + + result = platform_driver_register(&acpi_thermal_driver); + if (result < 0) { + destroy_workqueue(acpi_thermal_pm_queue); + return -ENODEV; + } + + return 0; +} + +static void __exit acpi_thermal_exit(void) +{ + platform_driver_unregister(&acpi_thermal_driver); + destroy_workqueue(acpi_thermal_pm_queue); +} + +module_init(acpi_thermal_init); +module_exit(acpi_thermal_exit); + +MODULE_IMPORT_NS("ACPI_THERMAL"); +MODULE_AUTHOR("Paul Diefenbaugh"); +MODULE_DESCRIPTION("ACPI Thermal Zone Driver"); +MODULE_LICENSE("GPL"); |