4 * Copyright 2012 Red Hat <mjg@redhat.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation, version 2.
11 #include <linux/module.h>
12 #include <linux/usb.h>
13 #include <linux/device.h>
14 #include <linux/errno.h>
15 #include <linux/kernel.h>
16 #include <linux/acpi.h>
17 #include <linux/pci.h>
18 #include <acpi/acpi_bus.h>
22 static int usb_acpi_check_upc(struct usb_device
*udev
, acpi_handle handle
)
25 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
26 union acpi_object
*upc
;
29 status
= acpi_evaluate_object(handle
, "_UPC", NULL
, &buffer
);
31 if (ACPI_FAILURE(status
))
36 if (!upc
|| (upc
->type
!= ACPI_TYPE_PACKAGE
)
37 || upc
->package
.count
!= 4) {
42 if (upc
->package
.elements
[0].integer
.value
)
43 udev
->removable
= USB_DEVICE_REMOVABLE
;
45 udev
->removable
= USB_DEVICE_FIXED
;
52 static int usb_acpi_check_pld(struct usb_device
*udev
, acpi_handle handle
)
57 status
= acpi_get_physical_device_location(handle
, &pld
);
59 if (ACPI_FAILURE(status
))
63 udev
->removable
= USB_DEVICE_REMOVABLE
;
65 udev
->removable
= USB_DEVICE_FIXED
;
70 static int usb_acpi_find_device(struct device
*dev
, acpi_handle
*handle
)
72 struct usb_device
*udev
;
73 struct device
*parent
;
74 acpi_handle
*parent_handle
;
76 if (!is_usb_device(dev
))
79 udev
= to_usb_device(dev
);
81 parent_handle
= DEVICE_ACPI_HANDLE(parent
);
86 *handle
= acpi_get_child(parent_handle
, udev
->portnum
);
92 * PLD will tell us whether a port is removable to the user or
93 * not. If we don't get an answer from PLD (it's not present
94 * or it's malformed) then try to infer it from UPC. If a
95 * device isn't connectable then it's probably not removable.
97 if (usb_acpi_check_pld(udev
, *handle
) != 0)
98 usb_acpi_check_upc(udev
, *handle
);
103 static struct acpi_bus_type usb_acpi_bus
= {
104 .bus
= &usb_bus_type
,
106 .find_device
= usb_acpi_find_device
,
109 int usb_acpi_register(void)
111 return register_acpi_bus_type(&usb_acpi_bus
);
114 void usb_acpi_unregister(void)
116 unregister_acpi_bus_type(&usb_acpi_bus
);