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ACPI: dock: add access to ACPI docking station UID 

It is useful to know whether your laptop is docked or not,
but it is even more useful to know which docking station it's
docked to. Attached patch adds "uid" file to sysfs.
Tested on Dell Latitude D600 with D/Dock.
Patch is against official 2.6.20 release.

Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Ilya A. Volynets-Evenbakh 2007-02-19 15:19:31 -08:00 committed by Len Brown
parent a967e127d0
commit ac122bb64b
1 changed files with 24 additions and 0 deletions
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24
drivers/acpi/dock.c
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@ -667,6 +667,23 @@ static ssize_t write_undock(struct device *dev, struct device_attribute *attr,
}
DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock);
/*
* show_dock_uid - read method for "uid" file in sysfs
*/
static ssize_t show_dock_uid(struct device *dev,
struct device_attribute *attr, char *buf)
{
unsigned long lbuf;
acpi_status status = acpi_evaluate_integer(dock_station->handle, "_UID", 0, &lbuf);
if(ACPI_FAILURE(status)) {
return 0;
}
return snprintf(buf, PAGE_SIZE, "%lx\n", lbuf);
}
DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL);
/**
* dock_add - add a new dock station
* @handle: the dock station handle
@ -715,6 +732,13 @@ static int dock_add(acpi_handle handle)
kfree(dock_station);
return ret;
}
ret = device_create_file(&dock_device.dev, &dev_attr_uid);
if (ret) {
printk("Error %d adding sysfs file\n", ret);
platform_device_unregister(&dock_device);
kfree(dock_station);
return ret;
}
/* Find dependent devices */
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,