From 6283f97d5fbfdd1e31694d7f6000eb728cdfba77 Mon Sep 17 00:00:00 2001 From: Betty Dall Date: Sat, 30 Apr 2016 10:03:37 -0600 Subject: 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 Signed-off-by: Rafael J. Wysocki --- drivers/acpi/device_sysfs.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'drivers') 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) -- cgit v1.2.3