ACPI: fan: Separate file for attributes creation

Move the functionality of creation of sysfs attributes under acpi device
to a new file fan_attr.c. This cleans up the core fan code, which just
use thermal sysfs interface. The original fan.c is renamed to
fan_core.c.

No functional changes are expected.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 416 insertions, 0 deletions

diff --git a/drivers/acpi/fan_core.c b/drivers/acpi/fan_core.c
new file mode 100644
index 000000000000..9f8e68403fad
--- /dev/null
+++ b/drivers/acpi/fan_core.c
@@ -0,0 +1,416 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  fan_core.c - ACPI Fan core Driver
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *  Copyright (C) 2022 Intel Corporation. All rights reserved.
+ */
+
+#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
+
+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 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);
+
+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;
+
+		result = acpi_fan_create_attributes(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)
+		acpi_fan_delete_attributes(device);
+
+	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);
+
+		acpi_fan_delete_attributes(device);
+	}
+	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);