diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/acpi/thermal.c | 1253 |
1 files changed, 1253 insertions, 0 deletions
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c new file mode 100644 index 000000000..d62bf6df7 --- /dev/null +++ b/drivers/acpi/thermal.c @@ -0,0 +1,1253 @@ +// 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. + */ + +#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 PREFIX "ACPI: " + +#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 _COMPONENT ACPI_THERMAL_COMPONENT +ACPI_MODULE_NAME("thermal"); + +MODULE_AUTHOR("Paul Diefenbaugh"); +MODULE_DESCRIPTION("ACPI Thermal Zone Driver"); +MODULE_LICENSE("GPL"); + +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; + +static int acpi_thermal_add(struct acpi_device *device); +static int acpi_thermal_remove(struct acpi_device *device); +static void acpi_thermal_notify(struct acpi_device *device, u32 event); + +static const struct acpi_device_id thermal_device_ids[] = { + {ACPI_THERMAL_HID, 0}, + {"", 0}, +}; +MODULE_DEVICE_TABLE(acpi, thermal_device_ids); + +#ifdef CONFIG_PM_SLEEP +static int acpi_thermal_suspend(struct device *dev); +static int acpi_thermal_resume(struct device *dev); +#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 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, +}; + +struct acpi_thermal_state { + u8 critical:1; + u8 hot:1; + u8 passive:1; + u8 active:1; + u8 reserved:4; + int active_index; +}; + +struct acpi_thermal_state_flags { + u8 valid:1; + u8 enabled:1; + u8 reserved:6; +}; + +struct acpi_thermal_critical { + struct acpi_thermal_state_flags flags; + unsigned long temperature; +}; + +struct acpi_thermal_hot { + struct acpi_thermal_state_flags flags; + unsigned long temperature; +}; + +struct acpi_thermal_passive { + struct acpi_thermal_state_flags flags; + unsigned long temperature; + unsigned long tc1; + unsigned long tc2; + unsigned long tsp; + struct acpi_handle_list devices; +}; + +struct acpi_thermal_active { + struct acpi_thermal_state_flags flags; + unsigned long temperature; + struct acpi_handle_list devices; +}; + +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_flags { + u8 cooling_mode:1; /* _SCP */ + u8 devices:1; /* _TZD */ + u8 reserved:6; +}; + +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_flags flags; + struct acpi_thermal_state state; + 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_DEBUG_PRINT((ACPI_DB_INFO, "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_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", + tz->polling_frequency)); + + return 0; +} + +static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) +{ + if (!tz) + return -EINVAL; + + if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle, + "_SCP", mode))) + return -ENODEV; + + return 0; +} + +#define ACPI_TRIPS_CRITICAL 0x01 +#define ACPI_TRIPS_HOT 0x02 +#define ACPI_TRIPS_PASSIVE 0x04 +#define ACPI_TRIPS_ACTIVE 0x08 +#define ACPI_TRIPS_DEVICES 0x10 + +#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE) +#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES + +#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, str) \ +do { \ + if (flags != ACPI_TRIPS_INIT) \ + ACPI_EXCEPTION((AE_INFO, AE_ERROR, \ + "ACPI thermal trip point %s changed\n" \ + "Please send acpidump to linux-acpi@vger.kernel.org", str)); \ +} while (0) + +static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag) +{ + acpi_status status = AE_OK; + unsigned long long tmp; + struct acpi_handle_list devices; + int valid = 0; + 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.flags.valid = 0; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "No critical threshold\n")); + } else if (tmp <= 2732) { + pr_warn(FW_BUG "Invalid critical threshold (%llu)\n", + tmp); + tz->trips.critical.flags.valid = 0; + } else { + tz->trips.critical.flags.valid = 1; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Found critical threshold [%lu]\n", + tz->trips.critical.temperature)); + } + if (tz->trips.critical.flags.valid == 1) { + if (crt == -1) { + tz->trips.critical.flags.valid = 0; + } 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_warn(PREFIX "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.flags.valid = 0; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "No hot threshold\n")); + } else { + tz->trips.hot.temperature = tmp; + tz->trips.hot.flags.valid = 1; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Found hot threshold [%lu]\n", + tz->trips.hot.temperature)); + } + } + + /* Passive (optional) */ + if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) || + (flag == ACPI_TRIPS_INIT)) { + valid = tz->trips.passive.flags.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.flags.valid = 0; + else { + tz->trips.passive.temperature = tmp; + tz->trips.passive.flags.valid = 1; + if (flag == ACPI_TRIPS_INIT) { + status = acpi_evaluate_integer( + tz->device->handle, "_TC1", + NULL, &tmp); + if (ACPI_FAILURE(status)) + tz->trips.passive.flags.valid = 0; + else + tz->trips.passive.tc1 = tmp; + status = acpi_evaluate_integer( + tz->device->handle, "_TC2", + NULL, &tmp); + if (ACPI_FAILURE(status)) + tz->trips.passive.flags.valid = 0; + else + tz->trips.passive.tc2 = tmp; + status = acpi_evaluate_integer( + tz->device->handle, "_TSP", + NULL, &tmp); + if (ACPI_FAILURE(status)) + tz->trips.passive.flags.valid = 0; + else + tz->trips.passive.tsp = tmp; + } + } + } + if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) { + memset(&devices, 0, sizeof(struct acpi_handle_list)); + status = acpi_evaluate_reference(tz->device->handle, "_PSL", + NULL, &devices); + if (ACPI_FAILURE(status)) { + pr_warn(PREFIX "Invalid passive threshold\n"); + tz->trips.passive.flags.valid = 0; + } + else + tz->trips.passive.flags.valid = 1; + + 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, "device"); + } + } + if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) { + if (valid != tz->trips.passive.flags.valid) + ACPI_THERMAL_TRIPS_EXCEPTION(flag, "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].flags.valid; + + if (act == -1) + break; /* disable all active trip points */ + + if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) && + tz->trips.active[i].flags.valid)) { + status = acpi_evaluate_integer(tz->device->handle, + name, NULL, &tmp); + if (ACPI_FAILURE(status)) { + tz->trips.active[i].flags.valid = 0; + 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 = + (tz->trips.active[i - 2].temperature < + celsius_to_deci_kelvin(act) ? + tz->trips.active[i - 2].temperature : + celsius_to_deci_kelvin(act)); + break; + } else { + tz->trips.active[i].temperature = tmp; + tz->trips.active[i].flags.valid = 1; + } + } + + name[2] = 'L'; + if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) { + memset(&devices, 0, sizeof(struct acpi_handle_list)); + status = acpi_evaluate_reference(tz->device->handle, + name, NULL, &devices); + if (ACPI_FAILURE(status)) { + pr_warn(PREFIX "Invalid active%d threshold\n", + i); + tz->trips.active[i].flags.valid = 0; + } + else + tz->trips.active[i].flags.valid = 1; + + 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, "device"); + } + } + if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES)) + if (valid != tz->trips.active[i].flags.valid) + ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state"); + + if (!tz->trips.active[i].flags.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, "device"); + } + } + + return 0; +} + +static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) +{ + int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); + + if (ret) + return ret; + + valid = tz->trips.critical.flags.valid | + tz->trips.hot.flags.valid | + tz->trips.passive.flags.valid; + + for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) + valid |= tz->trips.active[i].flags.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->devdata; + 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->devdata; + int i; + + if (!tz || trip < 0) + return -EINVAL; + + if (tz->trips.critical.flags.valid) { + if (!trip) { + *type = THERMAL_TRIP_CRITICAL; + return 0; + } + trip--; + } + + if (tz->trips.hot.flags.valid) { + if (!trip) { + *type = THERMAL_TRIP_HOT; + return 0; + } + trip--; + } + + if (tz->trips.passive.flags.valid) { + if (!trip) { + *type = THERMAL_TRIP_PASSIVE; + return 0; + } + trip--; + } + + for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && + tz->trips.active[i].flags.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->devdata; + int i; + + if (!tz || trip < 0) + return -EINVAL; + + if (tz->trips.critical.flags.valid) { + if (!trip) { + *temp = deci_kelvin_to_millicelsius_with_offset( + tz->trips.critical.temperature, + tz->kelvin_offset); + return 0; + } + trip--; + } + + if (tz->trips.hot.flags.valid) { + if (!trip) { + *temp = deci_kelvin_to_millicelsius_with_offset( + tz->trips.hot.temperature, + tz->kelvin_offset); + return 0; + } + trip--; + } + + if (tz->trips.passive.flags.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].flags.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->devdata; + + if (tz->trips.critical.flags.valid) { + *temperature = deci_kelvin_to_millicelsius_with_offset( + tz->trips.critical.temperature, + tz->kelvin_offset); + return 0; + } else + return -EINVAL; +} + +static int thermal_get_trend(struct thermal_zone_device *thermal, + int trip, enum thermal_trend *trend) +{ + struct acpi_thermal *tz = thermal->devdata; + 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 int thermal_notify(struct thermal_zone_device *thermal, int trip, + enum thermal_trip_type trip_type) +{ + u8 type = 0; + struct acpi_thermal *tz = thermal->devdata; + + if (trip_type == THERMAL_TRIP_CRITICAL) + type = ACPI_THERMAL_NOTIFY_CRITICAL; + else if (trip_type == THERMAL_TRIP_HOT) + type = ACPI_THERMAL_NOTIFY_HOT; + else + return 0; + + acpi_bus_generate_netlink_event(tz->device->pnp.device_class, + dev_name(&tz->device->dev), type, 1); + + if (trip_type == THERMAL_TRIP_CRITICAL && nocrt) + return 1; + + return 0; +} + +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->devdata; + struct acpi_device *dev; + acpi_status status; + acpi_handle handle; + int i; + int j; + int trip = -1; + int result = 0; + + if (tz->trips.critical.flags.valid) + trip++; + + if (tz->trips.hot.flags.valid) + trip++; + + if (tz->trips.passive.flags.valid) { + trip++; + for (i = 0; i < tz->trips.passive.devices.count; + i++) { + handle = tz->trips.passive.devices.handles[i]; + status = acpi_bus_get_device(handle, &dev); + if (ACPI_FAILURE(status) || 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].flags.valid) + break; + trip++; + for (j = 0; + j < tz->trips.active[i].devices.count; + j++) { + handle = tz->trips.active[i].devices.handles[j]; + status = acpi_bus_get_device(handle, &dev); + if (ACPI_FAILURE(status) || 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 < tz->devices.count; i++) { + handle = tz->devices.handles[i]; + status = acpi_bus_get_device(handle, &dev); + if (ACPI_SUCCESS(status) && (dev == device)) { + if (bind) + result = thermal_zone_bind_cooling_device + (thermal, THERMAL_TRIPS_NONE, + cdev, THERMAL_NO_LIMIT, + THERMAL_NO_LIMIT, + THERMAL_WEIGHT_DEFAULT); + else + result = thermal_zone_unbind_cooling_device + (thermal, THERMAL_TRIPS_NONE, + 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, + .notify = thermal_notify, +}; + +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.flags.valid) + trips++; + + if (tz->trips.hot.flags.valid) + trips++; + + if (tz->trips.passive.flags.valid) + trips++; + + for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && + tz->trips.active[i].flags.valid; i++, trips++); + + if (tz->trips.passive.flags.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 = sysfs_create_link(&tz->device->dev.kobj, + &tz->thermal_zone->device.kobj, "thermal_zone"); + if (result) + goto unregister_tzd; + + result = sysfs_create_link(&tz->thermal_zone->device.kobj, + &tz->device->dev.kobj, "device"); + if (result) + goto remove_tz_link; + + status = acpi_bus_attach_private_data(tz->device->handle, + tz->thermal_zone); + if (ACPI_FAILURE(status)) { + result = -ENODEV; + goto remove_dev_link; + } + + 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", + tz->thermal_zone->id); + + return 0; + +acpi_bus_detach: + acpi_bus_detach_private_data(tz->device->handle); +remove_dev_link: + sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); +remove_tz_link: + sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); +unregister_tzd: + thermal_zone_device_unregister(tz->thermal_zone); + + return result; +} + +static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz) +{ + sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone"); + sysfs_remove_link(&tz->thermal_zone->device.kobj, "device"); + 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_REFRESH_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_REFRESH_DEVICES); + acpi_queue_thermal_check(tz); + acpi_bus_generate_netlink_event(device->pnp.device_class, + dev_name(&device->dev), event, 0); + break; + default: + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "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 = 0; + + + 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) */ + result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE); + if (!result) + tz->flags.cooling_mode = 1; + + /* 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.flags.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) +{ + int result = 0; + struct acpi_thermal *tz = NULL; + + + 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(PREFIX "%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 int acpi_thermal_remove(struct acpi_device *device) +{ + struct acpi_thermal *tz = NULL; + + if (!device || !acpi_driver_data(device)) + return -EINVAL; + + flush_workqueue(acpi_thermal_pm_queue); + tz = acpi_driver_data(device); + + acpi_thermal_unregister_thermal_zone(tz); + kfree(tz); + return 0; +} + +#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].flags.valid) + break; + tz->trips.active[i].flags.enabled = 1; + 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].flags.enabled = 0; + break; + } + } + tz->state.active |= tz->trips.active[i].flags.enabled; + } + + acpi_queue_thermal_check(tz); + + return AE_OK; +} +#endif + +static int thermal_act(const struct dmi_system_id *d) { + + if (act == 0) { + pr_notice(PREFIX "%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(PREFIX "%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(PREFIX "%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(PREFIX "%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 = 0; + + dmi_check_system(thermal_dmi_table); + + if (off) { + pr_notice(PREFIX "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); + + return; +} + +module_init(acpi_thermal_init); +module_exit(acpi_thermal_exit); |