On Wednesday, April 13, 2016 08:48:14 AM Betty Dall wrote:
> 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@xxxxxxx>
> ---
> 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;
Actually, this should be -EIO I think.
Thanks,
Rafael
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