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Subject[PATCH] ACPI/device_sysfs: Add sysfs support for _HRV hardware revision
Date
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.

Signed-off-by: Betty Dall <betty.dall@hpe.com>
---
drivers/acpi/device_sysfs.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c
index b9afb47..bf12dbe 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 -ENODEV;
+
+ 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)
--
1.9.1
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