new file mode 100644
@@ -0,0 +1,39 @@
+When the optional object _FPS is present for ACPI devices PNP0C0B or INT3404,
+additional attributes are displayed under acpi device object. These attributes
+display information about each performance state.
+
+For example
+$ ls /sys/bus/acpi/devices/INT3404\:00
+description fan_perf_state_11 fan_perf_state_5 fan_perf_state_9 physical_node uevent
+fan_perf_state_0 fan_perf_state_2 fan_perf_state_6 hid power uid
+fan_perf_state_1 fan_perf_state_3 fan_perf_state_7 modalias status wakeup
+fan_perf_state_10 fan_perf_state_4 fan_perf_state_8 path subsystem
+
+Each fan_perf_state_* contains the information about the fields for each state as
+defined by the ACPI specification.
+
+For example
+$ grep . /sys/bus/acpi/devices/INT3404\:00/fan_perf_state_1/*
+/sys/bus/acpi/devices/INT3404:00/fan_perf_state_1/control_percent:25
+/sys/bus/acpi/devices/INT3404:00/fan_perf_state_1/noise_level_mdb:12500
+/sys/bus/acpi/devices/INT3404:00/fan_perf_state_1/power_mw:1250
+/sys/bus/acpi/devices/INT3404:00/fan_perf_state_1/speed_rpm:3200
+/sys/bus/acpi/devices/INT3404:00/fan_perf_state_1/trip_point_index:invalid
+
+Fields
+control_percent: Indicates the value to be used to set the fan speed to a
+specific level using the _FSL object. The value here is from 0-100 percent.
+
+noise_level_mdb: Indicates the audible noise emitted by the fan. By the
+specification the value represents the noise in 10ths of decibels. Here
+it is multiplied with 100 to present in milli-db, to avoid loss of
+precision. When not populated, "not-defined" is displayed.
+
+speed_rpm: Indicates the speed of the fan in revolutions per minute.
+
+power_mw: Indicates the power consumption in milliwatts. When not populated,
+"not-defined" is displayed.
+
+trip_point_index: The active cooling trip point number that corresponds to this
+performance state. The range is from 0-9. For any other values, "invalid" is
+be displayed.
@@ -50,6 +50,7 @@ struct acpi_fan_fps {
u64 speed;
u64 noise_level;
u64 power;
+ struct kobject kobj;
};
struct acpi_fan_fif {
@@ -265,8 +266,67 @@ static int acpi_fan_speed_cmp(const void *a, const void *b)
return fps1->speed - fps2->speed;
}
-static int acpi_fan_get_fps(struct acpi_device *device)
+#define to_fps_state(k) container_of(k, struct acpi_fan_fps, kobj)
+
+#define DEFINE_ONE_FPS_ATTR_RO(_name)\
+ static struct kobj_attribute _name =\
+ __ATTR(_name, 0444, show_##_name, NULL)
+
+#define FPS_INFO_SHOW(name, object, multiplier)\
+static ssize_t show_##name(struct kobject *kobj,\
+ struct kobj_attribute *attr,\
+ char *buf)\
+{\
+ struct acpi_fan_fps *fps = to_fps_state(kobj);\
+\
+ if (fps->object == 0xFFFFFFFF)\
+ return sprintf(buf, "not-defined\n");\
+\
+ return sprintf(buf, "%llu\n", multiplier * fps->object);\
+}
+
+FPS_INFO_SHOW(control_percent, control, 1)
+FPS_INFO_SHOW(speed_rpm, speed, 1)
+FPS_INFO_SHOW(power_mw, power, 1)
+FPS_INFO_SHOW(noise_level_mdb, noise_level, 100)
+
+static ssize_t show_trip_point_index(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
{
+ struct acpi_fan_fps *fps = to_fps_state(kobj);
+
+ if (fps->trip_point > 9)
+ return sprintf(buf, "invalid\n");
+
+ return sprintf(buf, "%llu\n", fps->trip_point);
+}
+
+DEFINE_ONE_FPS_ATTR_RO(control_percent);
+DEFINE_ONE_FPS_ATTR_RO(trip_point_index);
+DEFINE_ONE_FPS_ATTR_RO(speed_rpm);
+DEFINE_ONE_FPS_ATTR_RO(noise_level_mdb);
+DEFINE_ONE_FPS_ATTR_RO(power_mw);
+
+static struct attribute *fps_attrs[] = {
+ &control_percent.attr,
+ &trip_point_index.attr,
+ &speed_rpm.attr,
+ &noise_level_mdb.attr,
+ &power_mw.attr,
+ NULL
+};
+
+static struct kobj_type fps_ktype = {
+ .sysfs_ops = &kobj_sysfs_ops,
+ .default_attrs = fps_attrs,
+};
+
+#define ACPI_FPS_NAME_LEN 20
+
+static int acpi_fan_get_fps(struct platform_device *pdev)
+{
+ struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
struct acpi_fan *fan = acpi_driver_data(device);
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
@@ -295,12 +355,13 @@ static int acpi_fan_get_fps(struct acpi_device *device)
}
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] };
+ struct acpi_buffer fps = { offsetof(struct acpi_fan_fps, kobj),
+ &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;
+ goto err;
}
}
@@ -308,6 +369,21 @@ static int acpi_fan_get_fps(struct acpi_device *device)
sort(fan->fps, fan->fps_count, sizeof(*fan->fps),
acpi_fan_speed_cmp, NULL);
+ for (i = 0; i < fan->fps_count; ++i) {
+ char name[ACPI_FPS_NAME_LEN];
+
+ snprintf(name, ACPI_FPS_NAME_LEN, "fan_perf_state_%d", i);
+ status = kobject_init_and_add(&fan->fps[i].kobj, &fps_ktype,
+ &device->dev.kobj, name);
+ if (status) {
+ int j;
+
+ for (j = 0; j < i; ++j)
+ kobject_put(&fan->fps[j].kobj);
+ break;
+ }
+ }
+
err:
kfree(obj);
return status;
@@ -330,14 +406,14 @@ static int acpi_fan_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, fan);
if (acpi_fan_is_acpi4(device)) {
- if (acpi_fan_get_fif(device) || acpi_fan_get_fps(device))
- goto end;
+ if (acpi_fan_get_fif(device) || acpi_fan_get_fps(pdev))
+ goto err_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;
+ goto err_end;
}
}
@@ -350,7 +426,7 @@ static int acpi_fan_probe(struct platform_device *pdev)
&fan_cooling_ops);
if (IS_ERR(cdev)) {
result = PTR_ERR(cdev);
- goto end;
+ goto err_end;
}
dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);
@@ -365,10 +441,21 @@ static int acpi_fan_probe(struct platform_device *pdev)
result = sysfs_create_link(&cdev->device.kobj,
&pdev->dev.kobj,
"device");
- if (result)
+ if (result) {
dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n");
+ goto err_end;
+ }
+
+ return 0;
+
+err_end:
+ if (fan->acpi4) {
+ int i;
+
+ for (i = 0; i < fan->fps_count; ++i)
+ kobject_put(&fan->fps[i].kobj);
+ }
-end:
return result;
}
@@ -376,6 +463,12 @@ static int acpi_fan_remove(struct platform_device *pdev)
{
struct acpi_fan *fan = platform_get_drvdata(pdev);
+ if (fan->acpi4) {
+ int i;
+
+ for (i = 0; i < fan->fps_count; ++i)
+ kobject_put(&fan->fps[i].kobj);
+ }
sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
sysfs_remove_link(&fan->cdev->device.kobj, "device");
thermal_cooling_device_unregister(fan->cdev);