+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
- *
- * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
- * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/uaccess.h>
-#include <linux/thermal.h>
-#include <linux/acpi.h>
-#include <linux/platform_device.h>
-#include <linux/sort.h>
-
-#include "fan.h"
-
-MODULE_AUTHOR("Paul Diefenbaugh");
-MODULE_DESCRIPTION("ACPI Fan Driver");
-MODULE_LICENSE("GPL");
-
-static int acpi_fan_probe(struct platform_device *pdev);
-static int acpi_fan_remove(struct platform_device *pdev);
-
-static const struct acpi_device_id fan_device_ids[] = {
- ACPI_FAN_DEVICE_IDS,
- {"", 0},
-};
-MODULE_DEVICE_TABLE(acpi, fan_device_ids);
-
-#ifdef CONFIG_PM_SLEEP
-static int acpi_fan_suspend(struct device *dev);
-static int acpi_fan_resume(struct device *dev);
-static const struct dev_pm_ops acpi_fan_pm = {
- .resume = acpi_fan_resume,
- .freeze = acpi_fan_suspend,
- .thaw = acpi_fan_resume,
- .restore = acpi_fan_resume,
-};
-#define FAN_PM_OPS_PTR (&acpi_fan_pm)
-#else
-#define FAN_PM_OPS_PTR NULL
-#endif
-
-#define ACPI_FPS_NAME_LEN 20
-
-struct acpi_fan_fps {
- u64 control;
- u64 trip_point;
- u64 speed;
- u64 noise_level;
- u64 power;
- char name[ACPI_FPS_NAME_LEN];
- struct device_attribute dev_attr;
-};
-
-struct acpi_fan_fif {
- u64 revision;
- u64 fine_grain_ctrl;
- u64 step_size;
- u64 low_speed_notification;
-};
-
-struct acpi_fan {
- bool acpi4;
- struct acpi_fan_fif fif;
- struct acpi_fan_fps *fps;
- int fps_count;
- struct thermal_cooling_device *cdev;
-};
-
-static struct platform_driver acpi_fan_driver = {
- .probe = acpi_fan_probe,
- .remove = acpi_fan_remove,
- .driver = {
- .name = "acpi-fan",
- .acpi_match_table = fan_device_ids,
- .pm = FAN_PM_OPS_PTR,
- },
-};
-
-/* thermal cooling device callbacks */
-static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
- *state)
-{
- struct acpi_device *device = cdev->devdata;
- struct acpi_fan *fan = acpi_driver_data(device);
-
- if (fan->acpi4)
- *state = fan->fps_count - 1;
- else
- *state = 1;
- return 0;
-}
-
-static int fan_get_state_acpi4(struct acpi_device *device, unsigned long *state)
-{
- struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
- struct acpi_fan *fan = acpi_driver_data(device);
- union acpi_object *obj;
- acpi_status status;
- int control, i;
-
- status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer);
- if (ACPI_FAILURE(status)) {
- dev_err(&device->dev, "Get fan state failed\n");
- return -ENODEV;
- }
-
- obj = buffer.pointer;
- if (!obj || obj->type != ACPI_TYPE_PACKAGE ||
- obj->package.count != 3 ||
- obj->package.elements[1].type != ACPI_TYPE_INTEGER) {
- dev_err(&device->dev, "Invalid _FST data\n");
- status = -EINVAL;
- goto err;
- }
-
- control = obj->package.elements[1].integer.value;
- for (i = 0; i < fan->fps_count; i++) {
- /*
- * When Fine Grain Control is set, return the state
- * corresponding to maximum fan->fps[i].control
- * value compared to the current speed. Here the
- * fan->fps[] is sorted array with increasing speed.
- */
- if (fan->fif.fine_grain_ctrl && control < fan->fps[i].control) {
- i = (i > 0) ? i - 1 : 0;
- break;
- } else if (control == fan->fps[i].control) {
- break;
- }
- }
- if (i == fan->fps_count) {
- dev_dbg(&device->dev, "Invalid control value returned\n");
- status = -EINVAL;
- goto err;
- }
-
- *state = i;
-
-err:
- kfree(obj);
- return status;
-}
-
-static int fan_get_state(struct acpi_device *device, unsigned long *state)
-{
- int result;
- int acpi_state = ACPI_STATE_D0;
-
- result = acpi_device_update_power(device, &acpi_state);
- if (result)
- return result;
-
- *state = acpi_state == ACPI_STATE_D3_COLD
- || acpi_state == ACPI_STATE_D3_HOT ?
- 0 : (acpi_state == ACPI_STATE_D0 ? 1 : -1);
- return 0;
-}
-
-static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
- *state)
-{
- struct acpi_device *device = cdev->devdata;
- struct acpi_fan *fan = acpi_driver_data(device);
-
- if (fan->acpi4)
- return fan_get_state_acpi4(device, state);
- else
- return fan_get_state(device, state);
-}
-
-static int fan_set_state(struct acpi_device *device, unsigned long state)
-{
- if (state != 0 && state != 1)
- return -EINVAL;
-
- return acpi_device_set_power(device,
- state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
-}
-
-static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state)
-{
- struct acpi_fan *fan = acpi_driver_data(device);
- acpi_status status;
-
- if (state >= fan->fps_count)
- return -EINVAL;
-
- status = acpi_execute_simple_method(device->handle, "_FSL",
- fan->fps[state].control);
- if (ACPI_FAILURE(status)) {
- dev_dbg(&device->dev, "Failed to set state by _FSL\n");
- return -ENODEV;
- }
-
- return 0;
-}
-
-static int
-fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
-{
- struct acpi_device *device = cdev->devdata;
- struct acpi_fan *fan = acpi_driver_data(device);
-
- if (fan->acpi4)
- return fan_set_state_acpi4(device, state);
- else
- return fan_set_state(device, state);
-}
-
-static const struct thermal_cooling_device_ops fan_cooling_ops = {
- .get_max_state = fan_get_max_state,
- .get_cur_state = fan_get_cur_state,
- .set_cur_state = fan_set_cur_state,
-};
-
-/* --------------------------------------------------------------------------
- * Driver Interface
- * --------------------------------------------------------------------------
-*/
-
-static bool acpi_fan_is_acpi4(struct acpi_device *device)
-{
- return acpi_has_method(device->handle, "_FIF") &&
- acpi_has_method(device->handle, "_FPS") &&
- acpi_has_method(device->handle, "_FSL") &&
- acpi_has_method(device->handle, "_FST");
-}
-
-static int acpi_fan_get_fif(struct acpi_device *device)
-{
- struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
- struct acpi_fan *fan = acpi_driver_data(device);
- struct acpi_buffer format = { sizeof("NNNN"), "NNNN" };
- struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif };
- union acpi_object *obj;
- acpi_status status;
-
- status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer);
- if (ACPI_FAILURE(status))
- return status;
-
- obj = buffer.pointer;
- if (!obj || obj->type != ACPI_TYPE_PACKAGE) {
- dev_err(&device->dev, "Invalid _FIF data\n");
- status = -EINVAL;
- goto err;
- }
-
- status = acpi_extract_package(obj, &format, &fif);
- if (ACPI_FAILURE(status)) {
- dev_err(&device->dev, "Invalid _FIF element\n");
- status = -EINVAL;
- }
-
-err:
- kfree(obj);
- return status;
-}
-
-static int acpi_fan_speed_cmp(const void *a, const void *b)
-{
- const struct acpi_fan_fps *fps1 = a;
- const struct acpi_fan_fps *fps2 = b;
- return fps1->speed - fps2->speed;
-}
-
-static ssize_t show_state(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct acpi_fan_fps *fps = container_of(attr, struct acpi_fan_fps, dev_attr);
- int count;
-
- if (fps->control == 0xFFFFFFFF || fps->control > 100)
- count = scnprintf(buf, PAGE_SIZE, "not-defined:");
- else
- count = scnprintf(buf, PAGE_SIZE, "%lld:", fps->control);
-
- if (fps->trip_point == 0xFFFFFFFF || fps->trip_point > 9)
- count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
- else
- count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->trip_point);
-
- if (fps->speed == 0xFFFFFFFF)
- count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
- else
- count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->speed);
-
- if (fps->noise_level == 0xFFFFFFFF)
- count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
- else
- count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->noise_level * 100);
-
- if (fps->power == 0xFFFFFFFF)
- count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined\n");
- else
- count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld\n", fps->power);
-
- return count;
-}
-
-static int acpi_fan_get_fps(struct acpi_device *device)
-{
- struct acpi_fan *fan = acpi_driver_data(device);
- struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
- union acpi_object *obj;
- acpi_status status;
- int i;
-
- status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer);
- if (ACPI_FAILURE(status))
- return status;
-
- obj = buffer.pointer;
- if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
- dev_err(&device->dev, "Invalid _FPS data\n");
- status = -EINVAL;
- goto err;
- }
-
- fan->fps_count = obj->package.count - 1; /* minus revision field */
- fan->fps = devm_kcalloc(&device->dev,
- fan->fps_count, sizeof(struct acpi_fan_fps),
- GFP_KERNEL);
- if (!fan->fps) {
- dev_err(&device->dev, "Not enough memory\n");
- status = -ENOMEM;
- goto err;
- }
- for (i = 0; i < fan->fps_count; i++) {
- struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
- struct acpi_buffer fps = { offsetof(struct acpi_fan_fps, name),
- &fan->fps[i] };
- status = acpi_extract_package(&obj->package.elements[i + 1],
- &format, &fps);
- if (ACPI_FAILURE(status)) {
- dev_err(&device->dev, "Invalid _FPS element\n");
- goto err;
- }
- }
-
- /* sort the state array according to fan speed in increase order */
- sort(fan->fps, fan->fps_count, sizeof(*fan->fps),
- acpi_fan_speed_cmp, NULL);
-
- for (i = 0; i < fan->fps_count; ++i) {
- struct acpi_fan_fps *fps = &fan->fps[i];
-
- snprintf(fps->name, ACPI_FPS_NAME_LEN, "state%d", i);
- sysfs_attr_init(&fps->dev_attr.attr);
- fps->dev_attr.show = show_state;
- fps->dev_attr.store = NULL;
- fps->dev_attr.attr.name = fps->name;
- fps->dev_attr.attr.mode = 0444;
- status = sysfs_create_file(&device->dev.kobj, &fps->dev_attr.attr);
- if (status) {
- int j;
-
- for (j = 0; j < i; ++j)
- sysfs_remove_file(&device->dev.kobj, &fan->fps[j].dev_attr.attr);
- break;
- }
- }
-
-err:
- kfree(obj);
- return status;
-}
-
-static int acpi_fan_probe(struct platform_device *pdev)
-{
- int result = 0;
- struct thermal_cooling_device *cdev;
- struct acpi_fan *fan;
- struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
- char *name;
-
- fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
- if (!fan) {
- dev_err(&device->dev, "No memory for fan\n");
- return -ENOMEM;
- }
- device->driver_data = fan;
- platform_set_drvdata(pdev, fan);
-
- if (acpi_fan_is_acpi4(device)) {
- result = acpi_fan_get_fif(device);
- if (result)
- return result;
-
- result = acpi_fan_get_fps(device);
- if (result)
- return result;
-
- fan->acpi4 = true;
- } else {
- result = acpi_device_update_power(device, NULL);
- if (result) {
- dev_err(&device->dev, "Failed to set initial power state\n");
- goto err_end;
- }
- }
-
- if (!strncmp(pdev->name, "PNP0C0B", strlen("PNP0C0B")))
- name = "Fan";
- else
- name = acpi_device_bid(device);
-
- cdev = thermal_cooling_device_register(name, device,
- &fan_cooling_ops);
- if (IS_ERR(cdev)) {
- result = PTR_ERR(cdev);
- goto err_end;
- }
-
- dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);
-
- fan->cdev = cdev;
- result = sysfs_create_link(&pdev->dev.kobj,
- &cdev->device.kobj,
- "thermal_cooling");
- if (result)
- dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n");
-
- result = sysfs_create_link(&cdev->device.kobj,
- &pdev->dev.kobj,
- "device");
- if (result) {
- dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n");
- goto err_end;
- }
-
- return 0;
-
-err_end:
- if (fan->acpi4) {
- int i;
-
- for (i = 0; i < fan->fps_count; ++i)
- sysfs_remove_file(&device->dev.kobj, &fan->fps[i].dev_attr.attr);
- }
-
- return result;
-}
-
-static int acpi_fan_remove(struct platform_device *pdev)
-{
- struct acpi_fan *fan = platform_get_drvdata(pdev);
-
- if (fan->acpi4) {
- struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
- int i;
-
- for (i = 0; i < fan->fps_count; ++i)
- sysfs_remove_file(&device->dev.kobj, &fan->fps[i].dev_attr.attr);
- }
- sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
- sysfs_remove_link(&fan->cdev->device.kobj, "device");
- thermal_cooling_device_unregister(fan->cdev);
-
- return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int acpi_fan_suspend(struct device *dev)
-{
- struct acpi_fan *fan = dev_get_drvdata(dev);
- if (fan->acpi4)
- return 0;
-
- acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0);
-
- return AE_OK;
-}
-
-static int acpi_fan_resume(struct device *dev)
-{
- int result;
- struct acpi_fan *fan = dev_get_drvdata(dev);
-
- if (fan->acpi4)
- return 0;
-
- result = acpi_device_update_power(ACPI_COMPANION(dev), NULL);
- if (result)
- dev_err(dev, "Error updating fan power state\n");
-
- return result;
-}
-#endif
-
-module_platform_driver(acpi_fan_driver);
git.samba.org / sfrench / cifs-2.6.git / blobdiff