Commit 9519a635 authored by Aaron Lu's avatar Aaron Lu Committed by Zhang Rui
Browse files

ACPI / Fan: add ACPI 4.0 style fan support 



This patch adds support for ACPI 4.0 style fan, lacking part is: no
support for 'Low Speed Notification Support', 'Fine Grain Control' is
not used yet.

It's not clear what to do on suspend/resume callback for 4.0 style ACPI
fan, so it does nothing for now.

Signed-off-by: default avatarAaron Lu <aaron.lu@intel.com>
Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
parent 19593a1f

drivers/acpi/fan.c

+241 −27
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#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");
@@ -59,6 +60,29 @@ static struct dev_pm_ops acpi_fan_pm = { 
#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,
@@ -73,21 +97,62 @@ static struct platform_driver acpi_fan_driver = { 
static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long

			     *state)

{

	/* ACPI fan device only support two states: ON/OFF */

	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_cur_state(struct thermal_cooling_device *cdev, unsigned long

			     *state)

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++) {

		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)

{

	struct acpi_device *device = cdev->devdata;

	int result;

	int acpi_state = ACPI_STATE_D0;



	if (!device)

		return -EINVAL;



	result = acpi_device_update_power(device, &acpi_state);

	if (result)

		return result;
@@ -97,19 +162,55 @@ static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long 
	return 0;

}



static int

fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)

static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long

			     *state)

{

	struct acpi_device *device = cdev->devdata;

	int result;

	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);

}



	if (!device || (state != 0 && state != 1))

static int fan_set_state(struct acpi_device *device, unsigned long state)

{

	if (state != 0 && state != 1)

		return -EINVAL;



	result = acpi_device_set_power(device,

	return acpi_device_set_power(device,

				     state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);

}



	return result;

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 = {
@@ -122,17 +223,126 @@ static const struct thermal_cooling_device_ops fan_cooling_ops = { 
                                 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_kzalloc(&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);



	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(&pdev->dev, "Setting initial power state\n");

			dev_err(&device->dev, "Setting initial power state\n");

			goto end;

		}

	}



	cdev = thermal_cooling_device_register("Fan", device,

						&fan_cooling_ops);
@@ -143,7 +353,7 @@ static int acpi_fan_probe(struct platform_device *pdev) 


	dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);



	platform_set_drvdata(pdev, cdev);

	fan->cdev = cdev;

	result = sysfs_create_link(&pdev->dev.kobj,

				   &cdev->device.kobj,

				   "thermal_cooling");
@@ -158,21 +368,17 @@ static int acpi_fan_probe(struct platform_device *pdev) 
		dev_err(&pdev->dev, "Failed to create sysfs link "

			"'device'\n");



	dev_info(&pdev->dev, "%s [%s] (%s)\n",

	       acpi_device_name(device), acpi_device_bid(device),

	       !device->power.state ? "on" : "off");



end:

	return result;

}



static int acpi_fan_remove(struct platform_device *pdev)

{

	struct thermal_cooling_device *cdev = platform_get_drvdata(pdev);

	struct acpi_fan *fan = platform_get_drvdata(pdev);



	sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");

	sysfs_remove_link(&cdev->device.kobj, "device");

	thermal_cooling_device_unregister(cdev);

	sysfs_remove_link(&fan->cdev->device.kobj, "device");

	thermal_cooling_device_unregister(fan->cdev);



	return 0;

}
@@ -180,6 +386,10 @@ static int acpi_fan_remove(struct platform_device *pdev) 
#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;
@@ -188,6 +398,10 @@ static int acpi_fan_suspend(struct device *dev) 
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)

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