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ACPI / Fan: add ACPI 4.0 style fan support
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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: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
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Aaron Lu authored and Zhang Rui committed Oct 10, 2014
1 parent 19593a1 commit 9519a63
Showing 1 changed file with 241 additions and 27 deletions.
268 changes: 241 additions & 27 deletions drivers/acpi/fan.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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");
Expand Down Expand Up @@ -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,
Expand All @@ -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 */
*state = 1;
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;
Expand All @@ -97,21 +162,57 @@ 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,
state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
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 = {
.get_max_state = fan_get_max_state,
.get_cur_state = fan_get_cur_state,
Expand All @@ -122,16 +223,125 @@ 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);

result = acpi_device_update_power(device, NULL);
if (result) {
dev_err(&pdev->dev, "Setting initial power state\n");
goto end;
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, "Setting initial power state\n");
goto end;
}
}

cdev = thermal_cooling_device_register("Fan", device,
Expand All @@ -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");
Expand All @@ -158,28 +368,28 @@ 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;
}

#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;
Expand All @@ -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)
Expand Down

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