@@ -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 */
- *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;
@@ -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,
@@ -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,
@@ -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)