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Subject[PATCH v2] create sun sysfs file
Even if a device has _SUN method, there is no way to know the slot unique-ID.
Thus the patch creates "sun" file in sysfs so that we can recognize it.

Index: linux-3.5/include/acpi/acpi_bus.h
===================================================================
--- linux-3.5.orig/include/acpi/acpi_bus.h 2012-07-22 05:58:29.000000000 +0900
+++ linux-3.5/include/acpi/acpi_bus.h 2012-07-27 10:05:13.860598455 +0900
@@ -209,6 +209,7 @@ struct acpi_device_pnp {
struct list_head ids; /* _HID and _CIDs */
acpi_device_name device_name; /* Driver-determined */
acpi_device_class device_class; /* " */
+ unsigned long sun; /* _SUN */
};

#define acpi_device_bid(d) ((d)->pnp.bus_id)
Index: linux-3.5/drivers/acpi/scan.c
===================================================================
--- linux-3.5.orig/drivers/acpi/scan.c 2012-07-22 05:58:29.000000000 +0900
+++ linux-3.5/drivers/acpi/scan.c 2012-07-27 10:17:55.670550879 +0900
@@ -192,10 +192,21 @@ end:
}
static DEVICE_ATTR(path, 0444, acpi_device_path_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);
+ int result;
+
+ result = sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
+ return result;
+}
+static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
+
static int acpi_device_setup_files(struct acpi_device *dev)
{
acpi_status status;
acpi_handle temp;
+ unsigned long long sun;
int result = 0;

/*
@@ -217,6 +228,14 @@ static int acpi_device_setup_files(struc
goto end;
}

+ 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;
+ }
+
/*
* If device has _EJ0, 'eject' file is created that is used to trigger
* hot-removal function from userland.
@@ -241,6 +260,10 @@ static void acpi_device_remove_files(str
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);
+
device_remove_file(&dev->dev, &dev_attr_modalias);
device_remove_file(&dev->dev, &dev_attr_hid);
if (dev->handle)


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