diff options
| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2014-01-10 16:00:05 -0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-01-11 01:53:13 +0100 |
| commit | c713cd7f2d799c50a0721bf51d178ea9567215dd (patch) | |
| tree | d41b010703bca8b680054570511a4e88180d2fad /drivers/acpi/scan.c | |
| parent | d1badf8d4323cfc9325b06651bdfcf7df09f1f0e (diff) | |
| download | linux-c713cd7f2d799c50a0721bf51d178ea9567215dd.tar.bz2 | |
ACPI / scan: ACPI device object sysfs attribute for _STA evaluation
This patch adds a "status" attribute for an ACPI device. This status
attribute shows the value of the _STA object. The _STA object returns
current status of an ACPI device: enabled, disabled, functioning,
present.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
[rjw: Subject and changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/scan.c')
| -rw-r--r-- | drivers/acpi/scan.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 32b340171d41..c0f57ff15024 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -602,6 +602,20 @@ acpi_device_sun_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR(sun, 0444, acpi_device_sun_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); + acpi_status status; + unsigned long long sta; + + status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta); + if (ACPI_FAILURE(status)) + return -ENODEV; + + return sprintf(buf, "%llu\n", sta); +} +static DEVICE_ATTR_RO(status); + static int acpi_device_setup_files(struct acpi_device *dev) { struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; @@ -657,6 +671,12 @@ static int acpi_device_setup_files(struct acpi_device *dev) dev->pnp.sun = (unsigned long)-1; } + if (acpi_has_method(dev->handle, "_STA")) { + result = device_create_file(&dev->dev, &dev_attr_status); + if (result) + goto end; + } + /* * If device has _EJ0, 'eject' file is created that is used to trigger * hot-removal function from userland. @@ -712,6 +732,8 @@ static void acpi_device_remove_files(struct acpi_device *dev) device_remove_file(&dev->dev, &dev_attr_adr); device_remove_file(&dev->dev, &dev_attr_modalias); device_remove_file(&dev->dev, &dev_attr_hid); + if (acpi_has_method(dev->handle, "_STA")) + device_remove_file(&dev->dev, &dev_attr_status); if (dev->handle) device_remove_file(&dev->dev, &dev_attr_path); } |