diff options
Diffstat (limited to 'drivers/acpi/thermal.c')
| -rw-r--r-- | drivers/acpi/thermal.c | 1445 |
1 files changed, 1445 insertions, 0 deletions
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c new file mode 100644 index 00000000000..79c3a686bc4 --- /dev/null +++ b/drivers/acpi/thermal.c @@ -0,0 +1,1445 @@ +/* + * 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/init.h> +#include <linux/types.h> +#include <linux/proc_fs.h> +#include <linux/sched.h> +#include <linux/kmod.h> +#include <linux/seq_file.h> +#include <asm/uaccess.h> + +#include <acpi/acpi_bus.h> +#include <acpi/acpi_drivers.h> + +#define ACPI_THERMAL_COMPONENT 0x04000000 +#define ACPI_THERMAL_CLASS "thermal_zone" +#define ACPI_THERMAL_DRIVER_NAME "ACPI Thermal Zone Driver" +#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_MODE_PASSIVE 0x01 +#define ACPI_THERMAL_MODE_CRITICAL 0xff +#define ACPI_THERMAL_PATH_POWEROFF "/sbin/poweroff" + +#define ACPI_THERMAL_MAX_ACTIVE 10 +#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65 + +#define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10) +#define CELSIUS_TO_KELVIN(t) ((t+273)*10) + +#define _COMPONENT ACPI_THERMAL_COMPONENT +ACPI_MODULE_NAME ("acpi_thermal") + +MODULE_AUTHOR("Paul Diefenbaugh"); +MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME); +MODULE_LICENSE("GPL"); + +static int tzp; +module_param(tzp, int, 0); +MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n"); + + +static int acpi_thermal_add (struct acpi_device *device); +static int acpi_thermal_remove (struct acpi_device *device, int type); +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 ssize_t acpi_thermal_write_trip_points (struct file*,const char __user *,size_t,loff_t *); +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 struct acpi_driver acpi_thermal_driver = { + .name = ACPI_THERMAL_DRIVER_NAME, + .class = ACPI_THERMAL_CLASS, + .ids = ACPI_THERMAL_HID, + .ops = { + .add = acpi_thermal_add, + .remove = acpi_thermal_remove, + }, +}; + +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 { + acpi_handle handle; + acpi_bus_id name; + unsigned long temperature; + unsigned long last_temperature; + unsigned long polling_frequency; + u8 cooling_mode; + volatile u8 zombie; + struct acpi_thermal_flags flags; + struct acpi_thermal_state state; + struct acpi_thermal_trips trips; + struct acpi_handle_list devices; + struct timer_list timer; +}; + +static struct file_operations acpi_thermal_state_fops = { + .open = acpi_thermal_state_open_fs, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static struct file_operations acpi_thermal_temp_fops = { + .open = acpi_thermal_temp_open_fs, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static struct file_operations acpi_thermal_trip_fops = { + .open = acpi_thermal_trip_open_fs, + .read = seq_read, + .write = acpi_thermal_write_trip_points, + .llseek = seq_lseek, + .release = single_release, +}; + +static struct file_operations acpi_thermal_cooling_fops = { + .open = acpi_thermal_cooling_open_fs, + .read = seq_read, + .write = acpi_thermal_write_cooling_mode, + .llseek = seq_lseek, + .release = single_release, +}; + +static struct file_operations acpi_thermal_polling_fops = { + .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; + + ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature"); + + if (!tz) + return_VALUE(-EINVAL); + + tz->last_temperature = tz->temperature; + + status = acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature); + if (ACPI_FAILURE(status)) + return_VALUE(-ENODEV); + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n", tz->temperature)); + + return_VALUE(0); +} + + +static int +acpi_thermal_get_polling_frequency ( + struct acpi_thermal *tz) +{ + acpi_status status = AE_OK; + + ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency"); + + if (!tz) + return_VALUE(-EINVAL); + + status = acpi_evaluate_integer(tz->handle, "_TZP", NULL, &tz->polling_frequency); + if (ACPI_FAILURE(status)) + return_VALUE(-ENODEV); + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n", tz->polling_frequency)); + + return_VALUE(0); +} + + +static int +acpi_thermal_set_polling ( + struct acpi_thermal *tz, + int seconds) +{ + ACPI_FUNCTION_TRACE("acpi_thermal_set_polling"); + + if (!tz) + return_VALUE(-EINVAL); + + tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */ + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency set to %lu seconds\n", tz->polling_frequency)); + + return_VALUE(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; + + ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode"); + + if (!tz) + return_VALUE(-EINVAL); + + status = acpi_get_handle(tz->handle, "_SCP", &handle); + if (ACPI_FAILURE(status)) { + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n")); + return_VALUE(-ENODEV); + } + + arg0.integer.value = mode; + + status = acpi_evaluate_object(handle, NULL, &arg_list, NULL); + if (ACPI_FAILURE(status)) + return_VALUE(-ENODEV); + + tz->cooling_mode = mode; + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n", + mode?"passive":"active")); + + return_VALUE(0); +} + + +static int +acpi_thermal_get_trip_points ( + struct acpi_thermal *tz) +{ + acpi_status status = AE_OK; + int i = 0; + + ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points"); + + if (!tz) + return_VALUE(-EINVAL); + + /* Critical Shutdown (required) */ + + status = acpi_evaluate_integer(tz->handle, "_CRT", NULL, + &tz->trips.critical.temperature); + if (ACPI_FAILURE(status)) { + tz->trips.critical.flags.valid = 0; + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No critical threshold\n")); + return_VALUE(-ENODEV); + } + else { + tz->trips.critical.flags.valid = 1; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found critical threshold [%lu]\n", tz->trips.critical.temperature)); + } + + /* Critical Sleep (optional) */ + + status = acpi_evaluate_integer(tz->handle, "_HOT", NULL, &tz->trips.hot.temperature); + if (ACPI_FAILURE(status)) { + tz->trips.hot.flags.valid = 0; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n")); + } + else { + tz->trips.hot.flags.valid = 1; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n", tz->trips.hot.temperature)); + } + + /* Passive: Processors (optional) */ + + status = acpi_evaluate_integer(tz->handle, "_PSV", NULL, &tz->trips.passive.temperature); + if (ACPI_FAILURE(status)) { + tz->trips.passive.flags.valid = 0; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n")); + } + else { + tz->trips.passive.flags.valid = 1; + + status = acpi_evaluate_integer(tz->handle, "_TC1", NULL, &tz->trips.passive.tc1); + if (ACPI_FAILURE(status)) + tz->trips.passive.flags.valid = 0; + + status = acpi_evaluate_integer(tz->handle, "_TC2", NULL, &tz->trips.passive.tc2); + if (ACPI_FAILURE(status)) + tz->trips.passive.flags.valid = 0; + + status = acpi_evaluate_integer(tz->handle, "_TSP", NULL, &tz->trips.passive.tsp); + if (ACPI_FAILURE(status)) + tz->trips.passive.flags.valid = 0; + + status = acpi_evaluate_reference(tz->handle, "_PSL", NULL, &tz->trips.passive.devices); + if (ACPI_FAILURE(status)) + tz->trips.passive.flags.valid = 0; + + if (!tz->trips.passive.flags.valid) + ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid passive threshold\n")); + else + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found passive threshold [%lu]\n", tz->trips.passive.temperature)); + } + + /* Active: Fans, etc. (optional) */ + + for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++) { + + char name[5] = {'_','A','C',('0'+i),'\0'}; + + status = acpi_evaluate_integer(tz->handle, name, NULL, &tz->trips.active[i].temperature); + if (ACPI_FAILURE(status)) + break; + + name[2] = 'L'; + status = acpi_evaluate_reference(tz->handle, name, NULL, &tz->trips.active[i].devices); + if (ACPI_SUCCESS(status)) { + tz->trips.active[i].flags.valid = 1; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found active threshold [%d]:[%lu]\n", i, tz->trips.active[i].temperature)); + } + else + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid active threshold [%d]\n", i)); + } + + return_VALUE(0); +} + + +static int +acpi_thermal_get_devices ( + struct acpi_thermal *tz) +{ + acpi_status status = AE_OK; + + ACPI_FUNCTION_TRACE("acpi_thermal_get_devices"); + + if (!tz) + return_VALUE(-EINVAL); + + status = acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices); + if (ACPI_FAILURE(status)) + return_VALUE(-ENODEV); + + return_VALUE(0); +} + + +static int +acpi_thermal_call_usermode ( + char *path) +{ + char *argv[2] = {NULL, NULL}; + char *envp[3] = {NULL, NULL, NULL}; + + ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode"); + + if (!path) + return_VALUE(-EINVAL); + + argv[0] = path; + + /* minimal command environment */ + envp[0] = "HOME=/"; + envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; + + call_usermodehelper(argv[0], argv, envp, 0); + + return_VALUE(0); +} + + +static int +acpi_thermal_critical ( + struct acpi_thermal *tz) +{ + int result = 0; + struct acpi_device *device = NULL; + + ACPI_FUNCTION_TRACE("acpi_thermal_critical"); + + if (!tz || !tz->trips.critical.flags.valid) + return_VALUE(-EINVAL); + + if (tz->temperature >= tz->trips.critical.temperature) { + ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip point\n")); + tz->trips.critical.flags.enabled = 1; + } + else if (tz->trips.critical.flags.enabled) + tz->trips.critical.flags.enabled = 0; + + result = acpi_bus_get_device(tz->handle, &device); + if (result) + return_VALUE(result); + + printk(KERN_EMERG "Critical temperature reached (%ld C), shutting down.\n", KELVIN_TO_CELSIUS(tz->temperature)); + acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL, tz->trips.critical.flags.enabled); + + acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF); + + return_VALUE(0); +} + + +static int +acpi_thermal_hot ( + struct acpi_thermal *tz) +{ + int result = 0; + struct acpi_device *device = NULL; + + ACPI_FUNCTION_TRACE("acpi_thermal_hot"); + + if (!tz || !tz->trips.hot.flags.valid) + return_VALUE(-EINVAL); + + if (tz->temperature >= tz->trips.hot.temperature) { + ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Hot trip point\n")); + tz->trips.hot.flags.enabled = 1; + } + else if (tz->trips.hot.flags.enabled) + tz->trips.hot.flags.enabled = 0; + + result = acpi_bus_get_device(tz->handle, &device); + if (result) + return_VALUE(result); + + acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT, tz->trips.hot.flags.enabled); + + /* TBD: Call user-mode "sleep(S4)" function */ + + return_VALUE(0); +} + + +static int +acpi_thermal_passive ( + struct acpi_thermal *tz) +{ + int result = 0; + struct acpi_thermal_passive *passive = NULL; + int trend = 0; + int i = 0; + + ACPI_FUNCTION_TRACE("acpi_thermal_passive"); + + if (!tz || !tz->trips.passive.flags.valid) + return_VALUE(-EINVAL); + + passive = &(tz->trips.passive); + + /* + * Above Trip? + * ----------- + * Calculate the thermal trend (using the passive cooling equation) + * and modify the performance limit for all passive cooling devices + * accordingly. Note that we assume symmetry. + */ + if (tz->temperature >= passive->temperature) { + trend = (passive->tc1 * (tz->temperature - tz->last_temperature)) + (passive->tc2 * (tz->temperature - passive->temperature)); + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n", + trend, passive->tc1, tz->temperature, + tz->last_temperature, passive->tc2, + tz->temperature, passive->temperature)); + tz->trips.passive.flags.enabled = 1; + /* Heating up? */ + if (trend > 0) + for (i=0; i<passive->devices.count; i++) + acpi_processor_set_thermal_limit( + passive->devices.handles[i], + ACPI_PROCESSOR_LIMIT_INCREMENT); + /* Cooling off? */ + else if (trend < 0) + for (i=0; i<passive->devices.count; i++) + acpi_processor_set_thermal_limit( + passive->devices.handles[i], + ACPI_PROCESSOR_LIMIT_DECREMENT); + } + + /* + * Below Trip? + * ----------- + * Implement passive cooling hysteresis to slowly increase performance + * and avoid thrashing around the passive trip point. Note that we + * assume symmetry. + */ + else if (tz->trips.passive.flags.enabled) { + for (i=0; i<passive->devices.count; i++) + result = acpi_processor_set_thermal_limit( + passive->devices.handles[i], + ACPI_PROCESSOR_LIMIT_DECREMENT); + if (result == 1) { + tz->trips.passive.flags.enabled = 0; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Disabling passive cooling (zone is cool)\n")); + } + } + + return_VALUE(0); +} + + +static int +acpi_thermal_active ( + struct acpi_thermal *tz) +{ + int result = 0; + struct acpi_thermal_active *active = NULL; + int i = 0; + int j = 0; + unsigned long maxtemp = 0; + + ACPI_FUNCTION_TRACE("acpi_thermal_active"); + + if (!tz) + return_VALUE(-EINVAL); + + for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++) { + + active = &(tz->trips.active[i]); + if (!active || !active->flags.valid) + break; + + /* + * Above Threshold? + * ---------------- + * If not already enabled, turn ON all cooling devices + * associated with this active threshold. + */ + if (tz->temperature >= active->temperature) { + if (active->temperature > maxtemp) + tz->state.active_index = i, maxtemp = active->temperature; + if (!active->flags.enabled) { + for (j = 0; j < active->devices.count; j++) { + result = acpi_bus_set_power(active->devices.handles[j], ACPI_STATE_D0); + if (result) { + ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to turn cooling device [%p] 'on'\n", active->devices.handles[j])); + continue; + } + active->flags.enabled = 1; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling device [%p] now 'on'\n", active->devices.handles[j])); + } + } + } + /* + * Below Threshold? + * ---------------- + * Turn OFF all cooling devices associated with this + * threshold. + */ + else if (active->flags.enabled) { + for (j = 0; j < active->devices.count; j++) { + result = acpi_bus_set_power(active->devices.handles[j], ACPI_STATE_D3); + if (result) { + ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to turn cooling device [%p] 'off'\n", active->devices.handles[j])); + continue; + } + active->flags.enabled = 0; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling device [%p] now 'off'\n", active->devices.handles[j])); + } + } + } + + return_VALUE(0); +} + + +static void acpi_thermal_check (void *context); + +static void +acpi_thermal_run ( + unsigned long data) +{ + struct acpi_thermal *tz = (struct acpi_thermal *)data; + if (!tz->zombie) + acpi_os_queue_for_execution(OSD_PRIORITY_GPE, + acpi_thermal_check, (void *) data); +} + + +static void +acpi_thermal_check ( + void *data) +{ + int result = 0; + struct acpi_thermal *tz = (struct acpi_thermal *) data; + unsigned long sleep_time = 0; + int i = 0; + struct acpi_thermal_state state; + + ACPI_FUNCTION_TRACE("acpi_thermal_check"); + + if (!tz) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n")); + return_VOID; + } + + state = tz->state; + + result = acpi_thermal_get_temperature(tz); + if (result) + return_VOID; + + memset(&tz->state, 0, sizeof(tz->state)); + + /* + * Check Trip Points + * ----------------- + * Compare the current temperature to the trip point values to see + * if we've entered one of the thermal policy states. Note that + * this function determines when a state is entered, but the + * individual policy decides when it is exited (e.g. hysteresis). + */ + if (tz->trips.critical.flags.valid) + state.critical |= (tz->temperature >= tz->trips.critical.temperature); + if (tz->trips.hot.flags.valid) + state.hot |= (tz->temperature >= tz->trips.hot.temperature); + if (tz->trips.passive.flags.valid) + state.passive |= (tz->temperature >= tz->trips.passive.temperature); + for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++) + if (tz->trips.active[i].flags.valid) + state.active |= (tz->temperature >= tz->trips.active[i].temperature); + + /* + * Invoke Policy + * ------------- + * Separated from the above check to allow individual policy to + * determine when to exit a given state. + */ + if (state.critical) + acpi_thermal_critical(tz); + if (state.hot) + acpi_thermal_hot(tz); + if (state.passive) + acpi_thermal_passive(tz); + if (state.active) + acpi_thermal_active(tz); + + /* + * Calculate State + * --------------- + * Again, separated from the above two to allow independent policy + * decisions. + */ + if (tz->trips.critical.flags.enabled) + tz->state.critical = 1; + if (tz->trips.hot.flags.enabled) + tz->state.hot = 1; + if (tz->trips.passive.flags.enabled) + tz->state.passive = 1; + for (i=0; i<ACPI_THERMAL_MAX_ACTIVE; i++) + if (tz->trips.active[i].flags.enabled) + tz->state.active = 1; + + /* + * Calculate Sleep Time + * -------------------- + * If we're in the passive state, use _TSP's value. Otherwise + * use the default polling frequency (e.g. _TZP). If no polling + * frequency is specified then we'll wait forever (at least until + * a thermal event occurs). Note that _TSP and _TZD values are + * given in 1/10th seconds (we must covert to milliseconds). + */ + if (tz->state.passive) + sleep_time = tz->trips.passive.tsp * 100; + else if (tz->polling_frequency > 0) + sleep_time = tz->polling_frequency * 100; + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n", + tz->name, tz->temperature, sleep_time)); + + /* + * Schedule Next Poll + * ------------------ + */ + if (!sleep_time) { + if (timer_pending(&(tz->timer))) + del_timer(&(tz->timer)); + } + else { + if (timer_pending(&(tz->timer))) + mod_timer(&(tz->timer), (HZ * sleep_time) / 1000); + else { + tz->timer.data = (unsigned long) tz; + tz->timer.function = acpi_thermal_run; + tz->timer.expires = jiffies + (HZ * sleep_time) / 1000; + add_timer(&(tz->timer)); + } + } + + return_VOID; +} + + +/* -------------------------------------------------------------------------- + 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 = (struct acpi_thermal *)seq->private; + + ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show"); + + 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_VALUE(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 = (struct acpi_thermal *)seq->private; + + ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show"); + + 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_VALUE(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 = (struct acpi_thermal *)seq->private; + int i = 0; + int j = 0; + + ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show"); + + if (!tz) + goto end; + + if (tz->trips.critical.flags.valid) + seq_printf(seq, "critical (S5): %ld C\n", + KELVIN_TO_CELSIUS(tz->trips.critical.temperature)); + + if (tz->trips.hot.flags.valid) + seq_printf(seq, "hot (S4): %ld C\n", + KELVIN_TO_CELSIUS(tz->trips.hot.temperature)); + + 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++) { + + seq_printf(seq, "0x%p ", tz->trips.passive.devices.handles[j]); + } + 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++) + seq_printf(seq, "0x%p ", + tz->trips.active[i].devices.handles[j]); + seq_puts(seq, "\n"); + } + +end: + return_VALUE(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 ssize_t +acpi_thermal_write_trip_points ( + struct file *file, + const char __user *buffer, + size_t count, + loff_t *ppos) +{ + struct seq_file *m = (struct seq_file *)file->private_data; + struct acpi_thermal *tz = (struct acpi_thermal *)m->private; + + char *limit_string; + int num, critical, hot, passive; + int *active; + int i = 0; + + ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points"); + + limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL); + if(!limit_string) + return_VALUE(-ENOMEM); + + memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN); + + active = kmalloc(ACPI_THERMAL_MAX_ACTIVE *sizeof(int), GFP_KERNEL); + if(!active) + return_VALUE(-ENOMEM); + + if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n")); + count = -EINVAL; + goto end; + } + + if (copy_from_user(limit_string, buffer, count)) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n")); + count = -EFAULT; + goto end; + } + + limit_string[count] = '\0'; + + num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d", + &critical, &hot, &passive, + &active[0], &active[1], &active[2], &active[3], &active[4], + &active[5], &active[6], &active[7], &active[8], &active[9]); + if(!(num >=5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n")); + count = -EINVAL; + goto end; + } + + tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical); + tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot); + tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive); + for (i = 0; i < num - 3; i++) { + if (!(tz->trips.active[i].flags.valid)) + break; + tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]); + } + +end: + kfree(active); + kfree(limit_string); + return_VALUE(count); +} + + +static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset) +{ + struct acpi_thermal *tz = (struct acpi_thermal *)seq->private; + + ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show"); + + if (!tz) + goto end; + + if (!tz->flags.cooling_mode) { + seq_puts(seq, "<setting not supported>\n"); + } + + if ( tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL ) + seq_printf(seq, "cooling mode: critical\n"); + else + seq_printf(seq, "cooling mode: %s\n", + tz->cooling_mode?"passive":"active"); + +end: + return_VALUE(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 = (struct seq_file *)file->private_data; + struct acpi_thermal *tz = (struct acpi_thermal *)m->private; + int result = 0; + char mode_string[12] = {'\0'}; + + ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode"); + + if (!tz || (count > sizeof(mode_string) - 1)) + return_VALUE(-EINVAL); + + if (!tz->flags.cooling_mode) + return_VALUE(-ENODEV); + + if (copy_from_user(mode_string, buffer, count)) + return_VALUE(-EFAULT); + + mode_string[count] = '\0'; + + result = acpi_thermal_set_cooling_mode(tz, + simple_strtoul(mode_string, NULL, 0)); + if (result) + return_VALUE(result); + + acpi_thermal_check(tz); + + return_VALUE(count); +} + + +static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset) +{ + struct acpi_thermal *tz = (struct acpi_thermal *)seq->private; + + ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show"); + + if (!tz) + goto end; + + if (!tz->polling_frequency) { + seq_puts(seq, "<polling disabled>\n"); + goto end; + } + + seq_printf(seq, "polling frequency: %lu seconds\n", + (tz->polling_frequency / 10)); + +end: + return_VALUE(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 = (struct seq_file *)file->private_data; + struct acpi_thermal *tz = (struct acpi_thermal *)m->private; + int result = 0; + char polling_string[12] = {'\0'}; + int seconds = 0; + + ACPI_FUNCTION_TRACE("acpi_thermal_write_polling"); + + if (!tz || (count > sizeof(polling_string) - 1)) + return_VALUE(-EINVAL); + + if (copy_from_user(polling_string, buffer, count)) + return_VALUE(-EFAULT); + + polling_string[count] = '\0'; + + seconds = simple_strtoul(polling_string, NULL, 0); + + result = acpi_thermal_set_polling(tz, seconds); + if (result) + return_VALUE(result); + + acpi_thermal_check(tz); + + return_VALUE(count); +} + + +static int +acpi_thermal_add_fs ( + struct acpi_device *device) +{ + struct proc_dir_entry *entry = NULL; + + ACPI_FUNCTION_TRACE("acpi_thermal_add_fs"); + + if (!acpi_device_dir(device)) { + acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), + acpi_thermal_dir); + if (!acpi_device_dir(device)) + return_VALUE(-ENODEV); + acpi_device_dir(device)->owner = THIS_MODULE; + } + + /* 'state' [R] */ + entry = create_proc_entry(ACPI_THERMAL_FILE_STATE, + S_IRUGO, acpi_device_dir(device)); + if (!entry) + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Unable to create '%s' fs entry\n", + ACPI_THERMAL_FILE_STATE)); + else { + entry->proc_fops = &acpi_thermal_state_fops; + entry->data = acpi_driver_data(device); + entry->owner = THIS_MODULE; + } + + /* 'temperature' [R] */ + entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE, + S_IRUGO, acpi_device_dir(device)); + if (!entry) + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Unable to create '%s' fs entry\n", + ACPI_THERMAL_FILE_TEMPERATURE)); + else { + entry->proc_fops = &acpi_thermal_temp_fops; + entry->data = acpi_driver_data(device); + entry->owner = THIS_MODULE; + } + + /* 'trip_points' [R/W] */ + entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS, + S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device)); + if (!entry) + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Unable to create '%s' fs entry\n", + ACPI_THERMAL_FILE_TRIP_POINTS)); + else { + entry->proc_fops = &acpi_thermal_trip_fops; + entry->data = acpi_driver_data(device); + entry->owner = THIS_MODULE; + } + + /* 'cooling_mode' [R/W] */ + entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE, + S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device)); + if (!entry) + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Unable to create '%s' fs entry\n", + ACPI_THERMAL_FILE_COOLING_MODE)); + else { + entry->proc_fops = &acpi_thermal_cooling_fops; + entry->data = acpi_driver_data(device); + entry->owner = THIS_MODULE; + } + + /* 'polling_frequency' [R/W] */ + entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ, + S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device)); + if (!entry) + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Unable to create '%s' fs entry\n", + ACPI_THERMAL_FILE_POLLING_FREQ)); + else { + entry->proc_fops = &acpi_thermal_polling_fops; + entry->data = acpi_driver_data(device); + entry->owner = THIS_MODULE; + } + + return_VALUE(0); +} + + +static int +acpi_thermal_remove_fs ( + struct acpi_device *device) +{ + ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs"); + + 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_VALUE(0); +} + + +/* -------------------------------------------------------------------------- + Driver Interface + -------------------------------------------------------------------------- */ + +static void +acpi_thermal_notify ( + acpi_handle handle, + u32 event, + void *data) +{ + struct acpi_thermal *tz = (struct acpi_thermal *) data; + struct acpi_device *device = NULL; + + ACPI_FUNCTION_TRACE("acpi_thermal_notify"); + + if (!tz) + return_VOID; + + if (acpi_bus_get_device(tz->handle, &device)) + return_VOID; + + switch (event) { + case ACPI_THERMAL_NOTIFY_TEMPERATURE: + acpi_thermal_check(tz); + break; + case ACPI_THERMAL_NOTIFY_THRESHOLDS: + acpi_thermal_get_trip_points(tz); + acpi_thermal_check(tz); + acpi_bus_generate_event(device, event, 0); + break; + case ACPI_THERMAL_NOTIFY_DEVICES: + if (tz->flags.devices) + acpi_thermal_get_devices(tz); + acpi_bus_generate_event(device, event, 0); + break; + default: + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Unsupported event [0x%x]\n", event)); + break; + } + + return_VOID; +} + + +static int +acpi_thermal_get_info ( + struct acpi_thermal *tz) +{ + int result = 0; + + ACPI_FUNCTION_TRACE("acpi_thermal_get_info"); + + if (!tz) + return_VALUE(-EINVAL); + + /* Get temperature [_TMP] (required) */ + result = acpi_thermal_get_temperature(tz); + if (result) + return_VALUE(result); + + /* Get trip points [_CRT, _PSV, etc.] (required) */ + result = acpi_thermal_get_trip_points(tz); + if (result) + return_VALUE(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; + else { + /* Oh,we have not _SCP method. + Generally show cooling_mode by _ACx, _PSV,spec 12.2*/ + tz->flags.cooling_mode = 0; + if ( tz->trips.active[0].flags.valid && tz->trips.passive.flags.valid ) { + if ( tz->trips.passive.temperature > tz->trips.active[0].temperature ) + tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE; + else + tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE; + } else if ( !tz->trips.active[0].flags.valid && tz->trips.passive.flags.valid ) { + tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE; + } else if ( tz->trips.active[0].flags.valid && !tz->trips.passive.flags.valid ) { + tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE; + } else { + /* _ACx and _PSV are optional, but _CRT is required */ + tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL; + } + } + + /* Get default polling frequency [_TZP] (optional) */ + if (tzp) + tz->polling_frequency = tzp; + else + acpi_thermal_get_polling_frequency(tz); + + /* Get devices in this thermal zone [_TZD] (optional) */ + result = acpi_thermal_get_devices(tz); + if (!result) + tz->flags.devices = 1; + + return_VALUE(0); +} + + +static int +acpi_thermal_add ( + struct acpi_device *device) +{ + int result = 0; + acpi_status status = AE_OK; + struct acpi_thermal *tz = NULL; + + ACPI_FUNCTION_TRACE("acpi_thermal_add"); + + if (!device) + return_VALUE(-EINVAL); + + tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL); + if (!tz) + return_VALUE(-ENOMEM); + memset(tz, 0, sizeof(struct acpi_thermal)); + + tz->handle = device->handle; + strcpy(tz->name, device->pnp.bus_id); + strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME); + strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS); + acpi_driver_data(device) = tz; + + result = acpi_thermal_get_info(tz); + if (result) + goto end; + + result = acpi_thermal_add_fs(device); + if (result) + return_VALUE(result); + + init_timer(&tz->timer); + + acpi_thermal_check(tz); + + status = acpi_install_notify_handler(tz->handle, + ACPI_DEVICE_NOTIFY, acpi_thermal_notify, tz); + if (ACPI_FAILURE(status)) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Error installing notify handler\n")); + result = -ENODEV; + goto end; + } + + printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n", + acpi_device_name(device), acpi_device_bid(device), + KELVIN_TO_CELSIUS(tz->temperature)); + +end: + if (result) { + acpi_thermal_remove_fs(device); + kfree(tz); + } + + return_VALUE(result); +} + + +static int +acpi_thermal_remove ( + struct acpi_device *device, + int type) +{ + acpi_status status = AE_OK; + struct acpi_thermal *tz = NULL; + + ACPI_FUNCTION_TRACE("acpi_thermal_remove"); + + if (!device || !acpi_driver_data(device)) + return_VALUE(-EINVAL); + + tz = (struct acpi_thermal *) acpi_driver_data(device); + + /* avoid timer adding new defer task */ + tz->zombie = 1; + /* wait for running timer (on other CPUs) finish */ + del_timer_sync(&(tz->timer)); + /* synchronize deferred task */ + acpi_os_wait_events_complete(NULL); + /* deferred task may reinsert timer */ + del_timer_sync(&(tz->timer)); + + status = acpi_remove_notify_handler(tz->handle, + ACPI_DEVICE_NOTIFY, acpi_thermal_notify); + if (ACPI_FAILURE(status)) + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Error removing notify handler\n")); + + /* Terminate policy */ + if (tz->trips.passive.flags.valid + && tz->trips.passive.flags.enabled) { + tz->trips.passive.flags.enabled = 0; + acpi_thermal_passive(tz); + } + if (tz->trips.active[0].flags.valid + && tz->trips.active[0].flags.enabled) { + tz->trips.active[0].flags.enabled = 0; + acpi_thermal_active(tz); + } + + acpi_thermal_remove_fs(device); + + kfree(tz); + return_VALUE(0); +} + + +static int __init +acpi_thermal_init (void) +{ + int result = 0; + + ACPI_FUNCTION_TRACE("acpi_thermal_init"); + + acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir); + if (!acpi_thermal_dir) + return_VALUE(-ENODEV); + acpi_thermal_dir->owner = THIS_MODULE; + + result = acpi_bus_register_driver(&acpi_thermal_driver); + if (result < 0) { + remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); + return_VALUE(-ENODEV); + } + + return_VALUE(0); +} + + +static void __exit +acpi_thermal_exit (void) +{ + ACPI_FUNCTION_TRACE("acpi_thermal_exit"); + + acpi_bus_unregister_driver(&acpi_thermal_driver); + + remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir); + + return_VOID; +} + + +module_init(acpi_thermal_init); +module_exit(acpi_thermal_exit); |