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: Betty Dall <betty.dall@hpe.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c
index b9afb47db7ed..49cc0cbff0b8 100644
--- a/drivers/acpi/device_sysfs.c
+++ b/drivers/acpi/device_sysfs.c
@@ -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)