v4.19.13 snapshot.
diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
new file mode 100644
index 0000000..fe0183d
--- /dev/null
+++ b/drivers/acpi/fan.c
@@ -0,0 +1,427 @@
+/*
+ * 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>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * 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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#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>
+
+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[] = {
+ {"PNP0C0B", 0},
+ {"INT3404", 0},
+ {"", 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
+
+struct acpi_fan_fps {
+ u64 control;
+ u64 trip_point;
+ u64 speed;
+ u64 noise_level;
+ u64 power;
+};
+
+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 status;
+ }
+
+ 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 status;
+ }
+
+ 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 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 = { sizeof(fan->fps[i]), &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");
+ break;
+ }
+ }
+
+ /* 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);
+
+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)) {
+ if (acpi_fan_get_fif(device) || acpi_fan_get_fps(device))
+ goto end;
+ 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 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 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");
+
+end:
+ return result;
+}
+
+static int acpi_fan_remove(struct platform_device *pdev)
+{
+ struct acpi_fan *fan = platform_get_drvdata(pdev);
+
+ 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);