/* * 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 program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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/types.h> #include <linux/proc_fs.h> #include <linux/jiffies.h> #include <linux/kmod.h> #include <linux/seq_file.h> #include <linux/reboot.h> #include <linux/device.h> #include <asm/uaccess.h> #include <linux/thermal.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #define PREFIX "ACPI: " #define ACPI_THERMAL_CLASS "thermal_zone" #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone" #define ACPI_THERMAL_FILE_STATE "state" #define ACPI_THERMAL_FILE_TEMPERATURE "temperature" #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points" #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode" #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency" #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 int acpi_thermal_add(struct acpi_device *device); static int acpi_thermal_remove(struct acpi_device *device, int type); static int acpi_thermal_resume(struct acpi_device *device); static void acpi_thermal_notify(struct acpi_device *device, u32 event); static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file); static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file); static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file); static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file); static ssize_t acpi_thermal_write_cooling_mode(struct file *, const char __user *, size_t, loff_t *); static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file); static ssize_t acpi_thermal_write_polling(struct file *, const char __user *, size_t, loff_t *); 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, .resume = acpi_thermal_resume, .notify = acpi_thermal_notify, }, }; 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 tz_enabled; int kelvin_offset; struct mutex lock; }; static const struct file_operations acpi_thermal_state_fops = { .owner = THIS_MODULE, .open = acpi_thermal_state_open_fs, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static const struct file_operations acpi_thermal_temp_fops = { .owner = THIS_MODULE, .open = acpi_thermal_temp_open_fs, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static const struct file_operations acpi_thermal_trip_fops = { .owner = THIS_MODULE, .open = acpi_thermal_trip_open_fs, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static const struct file_operations acpi_thermal_cooling_fops = { .owner = THIS_MODULE, .open = acpi_thermal_cooling_open_fs, .read = seq_read, .write = acpi_thermal_write_cooling_mode, .llseek = seq_lseek, .release = single_release, }; static const struct file_operations acpi_thermal_polling_fops = { .owner = THIS_MODULE, .open = acpi_thermal_polling_open_fs, .read = seq_read, .write = acpi_thermal_write_polling, .llseek = seq_lseek, .release = single_release, }; /* -------------------------------------------------------------------------- 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_polling(struct acpi_thermal *tz, int seconds) { if (!tz) return -EINVAL; tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */ tz->thermal_zone->polling_delay = seconds * 1000; if (tz->tz_enabled) thermal_zone_device_update(tz->thermal_zone); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency set to %lu seconds\n", tz->polling_frequency/10)); return 0; } static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode) { acpi_status status = AE_OK; union acpi_object arg0 = { ACPI_TYPE_INTEGER }; struct acpi_object_list arg_list = { 1, &arg0 }; acpi_handle handle = NULL; if (!tz) return -EINVAL; status = acpi_get_handle(tz->device->handle, "_SCP", &handle); if (ACPI_FAILURE(status)) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n")); return -ENODEV; } arg0.integer.value = mode; status = acpi_evaluate_object(handle, NULL, &arg_list, NULL); if (ACPI_FAILURE(status)) 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\n", 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 (required) */ 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.temperature <= 2732) { tz->trips.critical.flags.valid = 0; ACPI_EXCEPTION((AE_INFO, status, "No or invalid critical threshold")); return -ENODEV; } 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_KELVIN(crt); /* * Allow override critical threshold */ if (crt_k > tz->trips.critical.temperature) printk(KERN_WARNING 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.critical.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_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)) { printk(KERN_WARNING 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_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_KELVIN(act) ? tz->trips.active[i - 2].temperature : CELSIUS_TO_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)) { printk(KERN_WARNING 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(struct acpi_handle_list)); status = acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &devices); if (memcmp(&tz->devices, &devices, sizeof(struct acpi_handle_list))) { memcpy(&tz->devices, &devices, sizeof(struct acpi_handle_list)); ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device"); } } return 0; } static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) { return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT); } static void acpi_thermal_check(void *data) { struct acpi_thermal *tz = data; thermal_zone_device_update(tz->thermal_zone); } /* sys I/F for generic thermal sysfs support */ #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100) static int thermal_get_temp(struct thermal_zone_device *thermal, unsigned long *temp) { struct acpi_thermal *tz = thermal->devdata; int result; if (!tz) return -EINVAL; result = acpi_thermal_get_temperature(tz); if (result) return result; *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset); return 0; } static const char enabled[] = "kernel"; static const char disabled[] = "user"; static int thermal_get_mode(struct thermal_zone_device *thermal, enum thermal_device_mode *mode) { struct acpi_thermal *tz = thermal->devdata; if (!tz) return -EINVAL; *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED; return 0; } static int thermal_set_mode(struct thermal_zone_device *thermal, enum thermal_device_mode mode) { struct acpi_thermal *tz = thermal->devdata; int enable; if (!tz) return -EINVAL; /* * enable/disable thermal management from ACPI thermal driver */ if (mode == THERMAL_DEVICE_ENABLED) enable = 1; else if (mode == THERMAL_DEVICE_DISABLED) enable = 0; else return -EINVAL; if (enable != tz->tz_enabled) { tz->tz_enabled = enable; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s ACPI thermal control\n", tz->tz_enabled ? enabled : disabled)); acpi_thermal_check(tz); } 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, unsigned long *temp) { struct acpi_thermal *tz = thermal->devdata; int i; if (!tz || trip < 0) return -EINVAL; if (tz->trips.critical.flags.valid) { if (!trip) { *temp = KELVIN_TO_MILLICELSIUS( tz->trips.critical.temperature, tz->kelvin_offset); return 0; } trip--; } if (tz->trips.hot.flags.valid) { if (!trip) { *temp = KELVIN_TO_MILLICELSIUS( tz->trips.hot.temperature, tz->kelvin_offset); return 0; } trip--; } if (tz->trips.passive.flags.valid) { if (!trip) { *temp = KELVIN_TO_MILLICELSIUS( 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 = KELVIN_TO_MILLICELSIUS( tz->trips.active[i].temperature, tz->kelvin_offset); return 0; } trip--; } return -EINVAL; } static int thermal_get_crit_temp(struct thermal_zone_device *thermal, unsigned long *temperature) { struct acpi_thermal *tz = thermal->devdata; if (tz->trips.critical.flags.valid) { *temperature = KELVIN_TO_MILLICELSIUS( tz->trips.critical.temperature, tz->kelvin_offset); return 0; } else return -EINVAL; } 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_proc_event(tz->device, type, 1); 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; } typedef int (*cb)(struct thermal_zone_device *, int, struct thermal_cooling_device *); static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal, struct thermal_cooling_device *cdev, cb action) { 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_SUCCESS(status) && (dev == device)) { result = action(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_SUCCESS(status) && (dev == device)) { result = action(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)) { result = action(thermal, -1, 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, thermal_zone_bind_cooling_device); } 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, thermal_zone_unbind_cooling_device); } 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_mode = thermal_get_mode, .set_mode = thermal_set_mode, .get_trip_type = thermal_get_trip_type, .get_trip_temp = thermal_get_trip_temp, .get_crit_temp = thermal_get_crit_temp, .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, tz, &acpi_thermal_zone_ops, tz->trips.passive.tc1, tz->trips.passive.tc2, tz->trips.passive.tsp*100, tz->polling_frequency*100); else tz->thermal_zone = thermal_zone_device_register("acpitz", trips, tz, &acpi_thermal_zone_ops, 0, 0, 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) return result; result = sysfs_create_link(&tz->thermal_zone->device.kobj, &tz->device->dev.kobj, "device"); if (result) return result; status = acpi_attach_data(tz->device->handle, acpi_bus_private_data_handler, tz->thermal_zone); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Error attaching device data\n"); return -ENODEV; } tz->tz_enabled = 1; dev_info(&tz->device->dev, "registered as thermal_zone%d\n", tz->thermal_zone->id); return 0; } 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_detach_data(tz->device->handle, acpi_bus_private_data_handler); } /* -------------------------------------------------------------------------- FS Interface (/proc) -------------------------------------------------------------------------- */ static struct proc_dir_entry *acpi_thermal_dir; static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset) { struct acpi_thermal *tz = seq->private; if (!tz) goto end; seq_puts(seq, "state: "); if (!tz->state.critical && !tz->state.hot && !tz->state.passive && !tz->state.active) seq_puts(seq, "ok\n"); else { if (tz->state.critical) seq_puts(seq, "critical "); if (tz->state.hot) seq_puts(seq, "hot "); if (tz->state.passive) seq_puts(seq, "passive "); if (tz->state.active) seq_printf(seq, "active[%d]", tz->state.active_index); seq_puts(seq, "\n"); } end: return 0; } static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file) { return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data); } static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset) { int result = 0; struct acpi_thermal *tz = seq->private; if (!tz) goto end; result = acpi_thermal_get_temperature(tz); if (result) goto end; seq_printf(seq, "temperature: %ld C\n", KELVIN_TO_CELSIUS(tz->temperature)); end: return 0; } static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file) { return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data); } static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset) { struct acpi_thermal *tz = seq->private; struct acpi_device *device; acpi_status status; int i = 0; int j = 0; if (!tz) goto end; if (tz->trips.critical.flags.valid) seq_printf(seq, "critical (S5): %ld C%s", KELVIN_TO_CELSIUS(tz->trips.critical.temperature), nocrt ? " <disabled>\n" : "\n"); if (tz->trips.hot.flags.valid) seq_printf(seq, "hot (S4): %ld C%s", KELVIN_TO_CELSIUS(tz->trips.hot.temperature), nocrt ? " <disabled>\n" : "\n"); if (tz->trips.passive.flags.valid) { seq_printf(seq, "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=", KELVIN_TO_CELSIUS(tz->trips.passive.temperature), tz->trips.passive.tc1, tz->trips.passive.tc2, tz->trips.passive.tsp); for (j = 0; j < tz->trips.passive.devices.count; j++) { status = acpi_bus_get_device(tz->trips.passive.devices. handles[j], &device); seq_printf(seq, "%4.4s ", status ? "" : acpi_device_bid(device)); } seq_puts(seq, "\n"); } for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { if (!(tz->trips.active[i].flags.valid)) break; seq_printf(seq, "active[%d]: %ld C: devices=", i, KELVIN_TO_CELSIUS(tz->trips.active[i].temperature)); for (j = 0; j < tz->trips.active[i].devices.count; j++){ status = acpi_bus_get_device(tz->trips.active[i]. devices.handles[j], &device); seq_printf(seq, "%4.4s ", status ? "" : acpi_device_bid(device)); } seq_puts(seq, "\n"); } end: return 0; } static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file) { return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data); } static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset) { struct acpi_thermal *tz = seq->private; if (!tz) goto end; if (!tz->flags.cooling_mode) seq_puts(seq, "<setting not supported>\n"); else seq_puts(seq, "0 - Active; 1 - Passive\n"); end: return 0; } static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file) { return single_open(file, acpi_thermal_cooling_seq_show, PDE(inode)->data); } static ssize_t acpi_thermal_write_cooling_mode(struct file *file, const char __user * buffer, size_t count, loff_t * ppos) { struct seq_file *m = file->private_data; struct acpi_thermal *tz = m->private; int result = 0; char mode_string[12] = { '\0' }; if (!tz || (count > sizeof(mode_string) - 1)) return -EINVAL; if (!tz->flags.cooling_mode) return -ENODEV; if (copy_from_user(mode_string, buffer, count)) return -EFAULT; mode_string[count] = '\0'; result = acpi_thermal_set_cooling_mode(tz, simple_strtoul(mode_string, NULL, 0)); if (result) return result; acpi_thermal_check(tz); return count; } static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset) { struct acpi_thermal *tz = seq->private; if (!tz) goto end; if (!tz->thermal_zone->polling_delay) { seq_puts(seq, "<polling disabled>\n"); goto end; } seq_printf(seq, "polling frequency: %d seconds\n", (tz->thermal_zone->polling_delay / 1000)); end: return 0; } static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file) { return single_open(file, acpi_thermal_polling_seq_show, PDE(inode)->data); } static ssize_t acpi_thermal_write_polling(struct file *file, const char __user * buffer, size_t count, loff_t * ppos) { struct seq_file *m = file->private_data; struct acpi_thermal *tz = m->private; int result = 0; char polling_string[12] = { '\0' }; int seconds = 0; if (!tz || (count > sizeof(polling_string) - 1)) return -EINVAL; if (copy_from_user(polling_string, buffer, count)) return -EFAULT; polling_string[count] = '\0'; seconds = simple_strtoul(polling_string, NULL, 0); result = acpi_thermal_set_polling(tz, seconds); if (result) return result; acpi_thermal_check(tz); return count; } static int acpi_thermal_add_fs(struct acpi_device *device) { struct proc_dir_entry *entry = NULL; if (!acpi_device_dir(device)) { acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_thermal_dir); if (!acpi_device_dir(device)) return -ENODEV; } /* 'state' [R] */ entry = proc_create_data(ACPI_THERMAL_FILE_STATE, S_IRUGO, acpi_device_dir(device), &acpi_thermal_state_fops, acpi_driver_data(device)); if (!entry) return -ENODEV; /* 'temperature' [R] */ entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE, S_IRUGO, acpi_device_dir(device), &acpi_thermal_temp_fops, acpi_driver_data(device)); if (!entry) return -ENODEV; /* 'trip_points' [R] */ entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS, S_IRUGO, acpi_device_dir(device), &acpi_thermal_trip_fops, acpi_driver_data(device)); if (!entry) return -ENODEV; /* 'cooling_mode' [R/W] */ entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE, S_IFREG | S_IRUGO | S_IWUSR, acpi_device_dir(device), &acpi_thermal_cooling_fops, acpi_driver_data(device)); if (!entry) return -ENODEV; /* 'polling_frequency' [R/W] */ entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ, S_IFREG | S_IRUGO | S_IWUSR, acpi_device_dir(device), &acpi_thermal_polling_fops, acpi_driver_data(device)); if (!entry) return -ENODEV; return 0; } static int acpi_thermal_remove_fs(struct acpi_device *device) { if (acpi_device_dir(device)) { remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ, acpi_device_dir(device)); remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE, acpi_device_dir(device)); remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS, acpi_device_dir(device)); remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE, acpi_device_dir(device)); remove_proc_entry(ACPI_THERMAL_FILE_STATE, acpi_device_dir(device)); remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir); acpi_device_dir(device) = NULL; } return 0; } /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ 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_thermal_check(tz); break; case ACPI_THERMAL_NOTIFY_THRESHOLDS: acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS); acpi_thermal_check(tz); acpi_bus_generate_proc_event(device, event, 0); 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_thermal_check(tz); acpi_bus_generate_proc_event(device, event, 0); 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; } } static int acpi_thermal_get_info(struct acpi_thermal *tz) { int result = 0; if (!tz) return -EINVAL; /* Get temperature [_TMP] (required) */ result = acpi_thermal_get_temperature(tz); if (result) return result; /* Get trip points [_CRT, _PSV, etc.] (required) */ result = acpi_thermal_get_trip_points(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 = 2731; else tz->kelvin_offset = 2732; } 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; mutex_init(&tz->lock); 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; result = acpi_thermal_add_fs(device); if (result) goto unregister_thermal_zone; printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device), acpi_device_bid(device), KELVIN_TO_CELSIUS(tz->temperature)); goto end; unregister_thermal_zone: thermal_zone_device_unregister(tz->thermal_zone); free_memory: kfree(tz); end: return result; } static int acpi_thermal_remove(struct acpi_device *device, int type) { struct acpi_thermal *tz = NULL; if (!device || !acpi_driver_data(device)) return -EINVAL; tz = acpi_driver_data(device); acpi_thermal_remove_fs(device); acpi_thermal_unregister_thermal_zone(tz); mutex_destroy(&tz->lock); kfree(tz); return 0; } static int acpi_thermal_resume(struct acpi_device *device) { struct acpi_thermal *tz = NULL; int i, j, power_state, result; if (!device || !acpi_driver_data(device)) return -EINVAL; tz = acpi_driver_data(device); for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { if (!(&tz->trips.active[i])) break; 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_get_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_thermal_check(tz); return AE_OK; } static int thermal_act(const struct dmi_system_id *d) { if (act == 0) { printk(KERN_NOTICE "ACPI: %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) { printk(KERN_NOTICE "ACPI: %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) { printk(KERN_NOTICE "ACPI: %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) { printk(KERN_NOTICE "ACPI: %s detected: " "disabling all passive thermal trip points\n", d->ident); psv = -1; } return 0; } static struct dmi_system_id thermal_dmi_table[] __initdata = { /* * 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) { printk(KERN_NOTICE "ACPI: thermal control disabled\n"); return -ENODEV; } acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir); if (!acpi_thermal_dir) return -ENODEV; result = acpi_bus_register_driver(&acpi_thermal_driver); if (result < 0) { remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); return -ENODEV; } return 0; } static void __exit acpi_thermal_exit(void) { acpi_bus_unregister_driver(&acpi_thermal_driver); remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); return; } module_init(acpi_thermal_init); module_exit(acpi_thermal_exit);