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Commit c713cd7f authored by Srinivas Pandruvada's avatar Srinivas Pandruvada Committed by Rafael J. Wysocki
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ACPI / scan: ACPI device object sysfs attribute for _STA evaluation 



This patch adds a "status" attribute for an ACPI device. This status
attribute shows the value of the _STA object. The _STA object returns
current status of an ACPI device: enabled, disabled, functioning,
present.

Signed-off-by: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
[rjw: Subject and changelog]
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent d1badf8d

drivers/acpi/scan.c

+22 −0
Original line number Diff line number Diff line
@@ -602,6 +602,20 @@ acpi_device_sun_show(struct device *dev, struct device_attribute *attr, 
}

static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);



static ssize_t status_show(struct device *dev, struct device_attribute *attr,

				char *buf) {

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	acpi_status status;

	unsigned long long sta;



	status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta);

	if (ACPI_FAILURE(status))

		return -ENODEV;



	return sprintf(buf, "%llu\n", sta);

}

static DEVICE_ATTR_RO(status);



static int acpi_device_setup_files(struct acpi_device *dev)

{

	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
@@ -657,6 +671,12 @@ static int acpi_device_setup_files(struct acpi_device *dev) 
		dev->pnp.sun = (unsigned long)-1;

	}



	if (acpi_has_method(dev->handle, "_STA")) {

		result = device_create_file(&dev->dev, &dev_attr_status);

		if (result)

			goto end;

	}



        /*

         * If device has _EJ0, 'eject' file is created that is used to trigger

         * hot-removal function from userland.
@@ -712,6 +732,8 @@ static void acpi_device_remove_files(struct acpi_device *dev) 
		device_remove_file(&dev->dev, &dev_attr_adr);

	device_remove_file(&dev->dev, &dev_attr_modalias);

	device_remove_file(&dev->dev, &dev_attr_hid);

	if (acpi_has_method(dev->handle, "_STA"))

		device_remove_file(&dev->dev, &dev_attr_status);

	if (dev->handle)

		device_remove_file(&dev->dev, &dev_attr_path);

}