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![Rafael J. Wysocki](/assets/img/avatar_default.png)
The ACPI fan device IDs are shared between the fan driver and the
device power management code. The former is modular, so it needs
to include the table of device IDs for module autoloading and the
latter needs that list to avoid attaching the generic ACPI PM domain
to fan devices (which doesn't make sense) possibly before the fan
driver module is loaded.
Unfortunately, that requires the list of fan device IDs to be
updated in two places which is prone to mistakes, so put it into
a symbol definition in a separate header file so there is only one
copy of it in case it needs to be updated again in the future.
Fixes: b9ea0bae26
("ACPI: PM: Avoid attaching ACPI PM domain to certain devices")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
496 lines
12 KiB
C
496 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <linux/thermal.h>
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#include <linux/acpi.h>
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#include <linux/platform_device.h>
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#include <linux/sort.h>
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#include "fan.h"
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION("ACPI Fan Driver");
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MODULE_LICENSE("GPL");
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static int acpi_fan_probe(struct platform_device *pdev);
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static int acpi_fan_remove(struct platform_device *pdev);
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static const struct acpi_device_id fan_device_ids[] = {
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ACPI_FAN_DEVICE_IDS,
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, fan_device_ids);
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#ifdef CONFIG_PM_SLEEP
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static int acpi_fan_suspend(struct device *dev);
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static int acpi_fan_resume(struct device *dev);
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static const struct dev_pm_ops acpi_fan_pm = {
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.resume = acpi_fan_resume,
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.freeze = acpi_fan_suspend,
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.thaw = acpi_fan_resume,
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.restore = acpi_fan_resume,
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};
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#define FAN_PM_OPS_PTR (&acpi_fan_pm)
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#else
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#define FAN_PM_OPS_PTR NULL
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#endif
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#define ACPI_FPS_NAME_LEN 20
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struct acpi_fan_fps {
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u64 control;
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u64 trip_point;
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u64 speed;
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u64 noise_level;
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u64 power;
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char name[ACPI_FPS_NAME_LEN];
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struct device_attribute dev_attr;
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};
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struct acpi_fan_fif {
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u64 revision;
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u64 fine_grain_ctrl;
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u64 step_size;
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u64 low_speed_notification;
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};
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struct acpi_fan {
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bool acpi4;
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struct acpi_fan_fif fif;
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struct acpi_fan_fps *fps;
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int fps_count;
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struct thermal_cooling_device *cdev;
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};
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static struct platform_driver acpi_fan_driver = {
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.probe = acpi_fan_probe,
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.remove = acpi_fan_remove,
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.driver = {
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.name = "acpi-fan",
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.acpi_match_table = fan_device_ids,
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.pm = FAN_PM_OPS_PTR,
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},
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};
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/* thermal cooling device callbacks */
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static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
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*state)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_fan *fan = acpi_driver_data(device);
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if (fan->acpi4)
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*state = fan->fps_count - 1;
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else
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*state = 1;
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return 0;
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}
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static int fan_get_state_acpi4(struct acpi_device *device, unsigned long *state)
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{
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_fan *fan = acpi_driver_data(device);
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union acpi_object *obj;
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acpi_status status;
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int control, i;
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status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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dev_err(&device->dev, "Get fan state failed\n");
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return status;
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}
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obj = buffer.pointer;
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if (!obj || obj->type != ACPI_TYPE_PACKAGE ||
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obj->package.count != 3 ||
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obj->package.elements[1].type != ACPI_TYPE_INTEGER) {
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dev_err(&device->dev, "Invalid _FST data\n");
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status = -EINVAL;
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goto err;
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}
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control = obj->package.elements[1].integer.value;
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for (i = 0; i < fan->fps_count; i++) {
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/*
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* When Fine Grain Control is set, return the state
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* corresponding to maximum fan->fps[i].control
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* value compared to the current speed. Here the
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* fan->fps[] is sorted array with increasing speed.
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*/
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if (fan->fif.fine_grain_ctrl && control < fan->fps[i].control) {
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i = (i > 0) ? i - 1 : 0;
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break;
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} else if (control == fan->fps[i].control) {
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break;
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}
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}
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if (i == fan->fps_count) {
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dev_dbg(&device->dev, "Invalid control value returned\n");
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status = -EINVAL;
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goto err;
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}
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*state = i;
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err:
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kfree(obj);
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return status;
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}
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static int fan_get_state(struct acpi_device *device, unsigned long *state)
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{
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int result;
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int acpi_state = ACPI_STATE_D0;
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result = acpi_device_update_power(device, &acpi_state);
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if (result)
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return result;
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*state = acpi_state == ACPI_STATE_D3_COLD
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|| acpi_state == ACPI_STATE_D3_HOT ?
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0 : (acpi_state == ACPI_STATE_D0 ? 1 : -1);
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return 0;
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}
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static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
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*state)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_fan *fan = acpi_driver_data(device);
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if (fan->acpi4)
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return fan_get_state_acpi4(device, state);
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else
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return fan_get_state(device, state);
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}
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static int fan_set_state(struct acpi_device *device, unsigned long state)
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{
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if (state != 0 && state != 1)
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return -EINVAL;
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return acpi_device_set_power(device,
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state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
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}
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static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state)
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{
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struct acpi_fan *fan = acpi_driver_data(device);
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acpi_status status;
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if (state >= fan->fps_count)
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return -EINVAL;
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status = acpi_execute_simple_method(device->handle, "_FSL",
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fan->fps[state].control);
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if (ACPI_FAILURE(status)) {
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dev_dbg(&device->dev, "Failed to set state by _FSL\n");
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return status;
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}
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return 0;
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}
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static int
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fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_fan *fan = acpi_driver_data(device);
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if (fan->acpi4)
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return fan_set_state_acpi4(device, state);
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else
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return fan_set_state(device, state);
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}
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static const struct thermal_cooling_device_ops fan_cooling_ops = {
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.get_max_state = fan_get_max_state,
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.get_cur_state = fan_get_cur_state,
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.set_cur_state = fan_set_cur_state,
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};
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/* --------------------------------------------------------------------------
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* Driver Interface
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* --------------------------------------------------------------------------
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*/
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static bool acpi_fan_is_acpi4(struct acpi_device *device)
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{
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return acpi_has_method(device->handle, "_FIF") &&
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acpi_has_method(device->handle, "_FPS") &&
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acpi_has_method(device->handle, "_FSL") &&
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acpi_has_method(device->handle, "_FST");
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}
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static int acpi_fan_get_fif(struct acpi_device *device)
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{
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_fan *fan = acpi_driver_data(device);
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struct acpi_buffer format = { sizeof("NNNN"), "NNNN" };
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struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif };
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union acpi_object *obj;
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acpi_status status;
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status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer);
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if (ACPI_FAILURE(status))
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return status;
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obj = buffer.pointer;
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if (!obj || obj->type != ACPI_TYPE_PACKAGE) {
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dev_err(&device->dev, "Invalid _FIF data\n");
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status = -EINVAL;
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goto err;
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}
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status = acpi_extract_package(obj, &format, &fif);
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if (ACPI_FAILURE(status)) {
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dev_err(&device->dev, "Invalid _FIF element\n");
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status = -EINVAL;
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}
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err:
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kfree(obj);
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return status;
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}
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static int acpi_fan_speed_cmp(const void *a, const void *b)
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{
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const struct acpi_fan_fps *fps1 = a;
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const struct acpi_fan_fps *fps2 = b;
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return fps1->speed - fps2->speed;
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}
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static ssize_t show_state(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct acpi_fan_fps *fps = container_of(attr, struct acpi_fan_fps, dev_attr);
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int count;
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if (fps->control == 0xFFFFFFFF || fps->control > 100)
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count = scnprintf(buf, PAGE_SIZE, "not-defined:");
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else
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count = scnprintf(buf, PAGE_SIZE, "%lld:", fps->control);
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if (fps->trip_point == 0xFFFFFFFF || fps->trip_point > 9)
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count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
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else
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count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->trip_point);
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if (fps->speed == 0xFFFFFFFF)
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count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
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else
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count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->speed);
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if (fps->noise_level == 0xFFFFFFFF)
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count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
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else
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count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->noise_level * 100);
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if (fps->power == 0xFFFFFFFF)
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count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined\n");
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else
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count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld\n", fps->power);
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return count;
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}
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static int acpi_fan_get_fps(struct acpi_device *device)
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{
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struct acpi_fan *fan = acpi_driver_data(device);
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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acpi_status status;
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int i;
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status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer);
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if (ACPI_FAILURE(status))
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return status;
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obj = buffer.pointer;
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if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
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dev_err(&device->dev, "Invalid _FPS data\n");
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status = -EINVAL;
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goto err;
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}
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fan->fps_count = obj->package.count - 1; /* minus revision field */
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fan->fps = devm_kcalloc(&device->dev,
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fan->fps_count, sizeof(struct acpi_fan_fps),
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GFP_KERNEL);
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if (!fan->fps) {
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dev_err(&device->dev, "Not enough memory\n");
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status = -ENOMEM;
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goto err;
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}
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for (i = 0; i < fan->fps_count; i++) {
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struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
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struct acpi_buffer fps = { offsetof(struct acpi_fan_fps, name),
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&fan->fps[i] };
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status = acpi_extract_package(&obj->package.elements[i + 1],
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&format, &fps);
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if (ACPI_FAILURE(status)) {
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dev_err(&device->dev, "Invalid _FPS element\n");
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goto err;
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}
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}
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/* sort the state array according to fan speed in increase order */
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sort(fan->fps, fan->fps_count, sizeof(*fan->fps),
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acpi_fan_speed_cmp, NULL);
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for (i = 0; i < fan->fps_count; ++i) {
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struct acpi_fan_fps *fps = &fan->fps[i];
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snprintf(fps->name, ACPI_FPS_NAME_LEN, "state%d", i);
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sysfs_attr_init(&fps->dev_attr.attr);
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fps->dev_attr.show = show_state;
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fps->dev_attr.store = NULL;
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fps->dev_attr.attr.name = fps->name;
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fps->dev_attr.attr.mode = 0444;
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status = sysfs_create_file(&device->dev.kobj, &fps->dev_attr.attr);
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if (status) {
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int j;
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for (j = 0; j < i; ++j)
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sysfs_remove_file(&device->dev.kobj, &fan->fps[j].dev_attr.attr);
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break;
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}
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}
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err:
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kfree(obj);
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return status;
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}
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static int acpi_fan_probe(struct platform_device *pdev)
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{
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int result = 0;
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struct thermal_cooling_device *cdev;
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struct acpi_fan *fan;
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struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
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char *name;
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fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
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if (!fan) {
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dev_err(&device->dev, "No memory for fan\n");
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return -ENOMEM;
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}
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device->driver_data = fan;
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platform_set_drvdata(pdev, fan);
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if (acpi_fan_is_acpi4(device)) {
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result = acpi_fan_get_fif(device);
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if (result)
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return result;
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result = acpi_fan_get_fps(device);
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if (result)
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return result;
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fan->acpi4 = true;
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} else {
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result = acpi_device_update_power(device, NULL);
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if (result) {
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dev_err(&device->dev, "Failed to set initial power state\n");
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goto err_end;
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}
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}
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if (!strncmp(pdev->name, "PNP0C0B", strlen("PNP0C0B")))
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name = "Fan";
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else
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name = acpi_device_bid(device);
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cdev = thermal_cooling_device_register(name, device,
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&fan_cooling_ops);
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if (IS_ERR(cdev)) {
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result = PTR_ERR(cdev);
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goto err_end;
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}
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dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);
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fan->cdev = cdev;
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result = sysfs_create_link(&pdev->dev.kobj,
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&cdev->device.kobj,
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"thermal_cooling");
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if (result)
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dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n");
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result = sysfs_create_link(&cdev->device.kobj,
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&pdev->dev.kobj,
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"device");
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if (result) {
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dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n");
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goto err_end;
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}
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return 0;
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err_end:
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if (fan->acpi4) {
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int i;
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for (i = 0; i < fan->fps_count; ++i)
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sysfs_remove_file(&device->dev.kobj, &fan->fps[i].dev_attr.attr);
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}
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return result;
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}
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static int acpi_fan_remove(struct platform_device *pdev)
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{
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struct acpi_fan *fan = platform_get_drvdata(pdev);
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if (fan->acpi4) {
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struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
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int i;
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for (i = 0; i < fan->fps_count; ++i)
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sysfs_remove_file(&device->dev.kobj, &fan->fps[i].dev_attr.attr);
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}
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sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
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sysfs_remove_link(&fan->cdev->device.kobj, "device");
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thermal_cooling_device_unregister(fan->cdev);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int acpi_fan_suspend(struct device *dev)
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{
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struct acpi_fan *fan = dev_get_drvdata(dev);
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if (fan->acpi4)
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return 0;
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acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0);
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return AE_OK;
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}
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static int acpi_fan_resume(struct device *dev)
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{
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int result;
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struct acpi_fan *fan = dev_get_drvdata(dev);
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if (fan->acpi4)
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return 0;
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result = acpi_device_update_power(ACPI_COMPANION(dev), NULL);
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if (result)
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dev_err(dev, "Error updating fan power state\n");
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return result;
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}
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#endif
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module_platform_driver(acpi_fan_driver);
|