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Commit 6283f97d authored by Betty Dall's avatar Betty Dall Committed by Rafael J. Wysocki
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ACPI / device_sysfs: Add sysfs support for _HRV hardware revision 



The ACPI _HRV object on the device is used to supply Linux with the
device's hardware revision. This is an optional object. Add sysfs support
for the _HRV object if it exists on the device.

This change allows users to easily find the hardware version of non-PCI
hardware by looking at the sysfs 'hrv' file. It is most useful for
non-PCI devices because lspci can list the hardware version for PCI
devices.

Signed-off-by: default avatarBetty Dall <betty.dall@hpe.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 2b13f01b

drivers/acpi/device_sysfs.c

+24 −0
Original line number Diff line number Diff line
@@ -473,6 +473,21 @@ acpi_device_sun_show(struct device *dev, struct device_attribute *attr, 
}

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



static ssize_t

acpi_device_hrv_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 hrv;



	status = acpi_evaluate_integer(acpi_dev->handle, "_HRV", NULL, &hrv);

	if (ACPI_FAILURE(status))

		return -EIO;



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

}

static DEVICE_ATTR(hrv, 0444, acpi_device_hrv_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);
@@ -541,6 +556,12 @@ int acpi_device_setup_files(struct acpi_device *dev) 
			goto end;

	}



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

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

		if (result)

			goto end;

	}



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

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

		if (result)
@@ -604,6 +625,9 @@ void acpi_device_remove_files(struct acpi_device *dev) 
	if (acpi_has_method(dev->handle, "_SUN"))

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



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

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



	if (dev->pnp.unique_id)

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

	if (dev->pnp.type.bus_address)