ACPI: create _SUN sysfs file

[linux-imx.git] / drivers / acpi / scan.c

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 9d43532d69b171e0a063a9b4585e5bf532023319..d0b38ab47ab5a98c691d71338b7923ac0dc9ed7b 100644 (file)
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -283,11 +283,21 @@ static ssize_t description_show(struct device *dev,
 }
 static DEVICE_ATTR(description, 0444, description_show, NULL);
 
+static ssize_t
+acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
+                    char *buf) {
+       struct acpi_device *acpi_dev = to_acpi_device(dev);
+
+       return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
+}
+static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
+
 static int acpi_device_setup_files(struct acpi_device *dev)
 {
        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
        acpi_status status;
        acpi_handle temp;
+       unsigned long long sun;
        int result = 0;
 
        /*
@@ -329,6 +339,16 @@ static int acpi_device_setup_files(struct acpi_device *dev)
        if (dev->pnp.unique_id)
                result = device_create_file(&dev->dev, &dev_attr_uid);
 
+       status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
+       if (ACPI_SUCCESS(status)) {
+               dev->pnp.sun = (unsigned long)sun;
+               result = device_create_file(&dev->dev, &dev_attr_sun);
+               if (result)
+                       goto end;
+       } else {
+               dev->pnp.sun = (unsigned long)-1;
+       }
+
         /*
          * If device has _EJ0, 'eject' file is created that is used to trigger
          * hot-removal function from userland.
@@ -360,6 +380,10 @@ static void acpi_device_remove_files(struct acpi_device *dev)
        if (ACPI_SUCCESS(status))
                device_remove_file(&dev->dev, &dev_attr_eject);
 
+       status = acpi_get_handle(dev->handle, "_SUN", &temp);
+       if (ACPI_SUCCESS(status))
+               device_remove_file(&dev->dev, &dev_attr_sun);
+
        if (dev->pnp.unique_id)
                device_remove_file(&dev->dev, &dev_attr_uid);
        if (dev->flags.bus_address)