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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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50eca3eb89
Completed a major overhaul of the Resource Manager code - specifically, optimizations in the area of the AML/internal resource conversion code. The code has been optimized to simplify and eliminate duplicated code, CPU stack use has been decreased by optimizing function parameters and local variables, and naming conventions across the manager have been standardized for clarity and ease of maintenance (this includes function, parameter, variable, and struct/typedef names.) All Resource Manager dispatch and information tables have been moved to a single location for clarity and ease of maintenance. One new file was created, named "rsinfo.c". The ACPI return macros (return_ACPI_STATUS, etc.) have been modified to guarantee that the argument is not evaluated twice, making them less prone to macro side-effects. However, since there exists the possibility of additional stack use if a particular compiler cannot optimize them (such as in the debug generation case), the original macros are optionally available. Note that some invocations of the return_VALUE macro may now cause size mismatch warnings; the return_UINT8 and return_UINT32 macros are provided to eliminate these. (From Randy Dunlap) Implemented a new mechanism to enable debug tracing for individual control methods. A new external interface, acpi_debug_trace(), is provided to enable this mechanism. The intent is to allow the host OS to easily enable and disable tracing for problematic control methods. This interface can be easily exposed to a user or debugger interface if desired. See the file psxface.c for details. acpi_ut_callocate() will now return a valid pointer if a length of zero is specified - a length of one is used and a warning is issued. This matches the behavior of acpi_ut_allocate(). Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
360 lines
8.5 KiB
C
360 lines
8.5 KiB
C
/*
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* Link physical devices with ACPI devices support
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*
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* Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
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* Copyright (c) 2005 Intel Corp.
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/rwsem.h>
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#include <linux/acpi.h>
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#define ACPI_GLUE_DEBUG 0
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#if ACPI_GLUE_DEBUG
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#define DBG(x...) printk(PREFIX x)
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#else
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#define DBG(x...)
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#endif
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static LIST_HEAD(bus_type_list);
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static DECLARE_RWSEM(bus_type_sem);
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int register_acpi_bus_type(struct acpi_bus_type *type)
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{
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if (acpi_disabled)
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return -ENODEV;
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if (type && type->bus && type->find_device) {
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down_write(&bus_type_sem);
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list_add_tail(&type->list, &bus_type_list);
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up_write(&bus_type_sem);
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printk(KERN_INFO PREFIX "bus type %s registered\n",
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type->bus->name);
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL(register_acpi_bus_type);
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int unregister_acpi_bus_type(struct acpi_bus_type *type)
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{
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if (acpi_disabled)
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return 0;
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if (type) {
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down_write(&bus_type_sem);
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list_del_init(&type->list);
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up_write(&bus_type_sem);
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printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
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type->bus->name);
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL(unregister_acpi_bus_type);
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static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
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{
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struct acpi_bus_type *tmp, *ret = NULL;
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down_read(&bus_type_sem);
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list_for_each_entry(tmp, &bus_type_list, list) {
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if (tmp->bus == type) {
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ret = tmp;
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break;
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}
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}
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up_read(&bus_type_sem);
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return ret;
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}
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static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
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{
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struct acpi_bus_type *tmp;
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int ret = -ENODEV;
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down_read(&bus_type_sem);
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list_for_each_entry(tmp, &bus_type_list, list) {
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if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
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ret = 0;
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break;
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}
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}
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up_read(&bus_type_sem);
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return ret;
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}
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/* Get PCI root bridge's handle from its segment and bus number */
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struct acpi_find_pci_root {
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unsigned int seg;
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unsigned int bus;
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acpi_handle handle;
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};
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static acpi_status
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do_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
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{
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unsigned long *busnr = (unsigned long *)data;
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struct acpi_resource_address64 address;
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if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
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resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
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resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
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return AE_OK;
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acpi_resource_to_address64(resource, &address);
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if ((address.address_length > 0) &&
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(address.resource_type == ACPI_BUS_NUMBER_RANGE))
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*busnr = address.minimum;
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return AE_OK;
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}
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static int get_root_bridge_busnr(acpi_handle handle)
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{
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acpi_status status;
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unsigned long bus, bbn;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
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status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL,
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&bbn);
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if (status == AE_NOT_FOUND) {
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/* Assume bus = 0 */
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printk(KERN_INFO PREFIX
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"Assume root bridge [%s] bus is 0\n",
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(char *)buffer.pointer);
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status = AE_OK;
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bbn = 0;
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}
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if (ACPI_FAILURE(status)) {
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bbn = -ENODEV;
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goto exit;
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}
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if (bbn > 0)
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goto exit;
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/* _BBN in some systems return 0 for all root bridges */
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bus = -1;
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status = acpi_walk_resources(handle, METHOD_NAME__CRS,
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do_root_bridge_busnr_callback, &bus);
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/* If _CRS failed, we just use _BBN */
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if (ACPI_FAILURE(status) || (bus == -1))
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goto exit;
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/* We select _CRS */
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if (bbn != bus) {
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printk(KERN_INFO PREFIX
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"_BBN and _CRS returns different value for %s. Select _CRS\n",
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(char *)buffer.pointer);
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bbn = bus;
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}
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exit:
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acpi_os_free(buffer.pointer);
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return (int)bbn;
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}
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static acpi_status
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find_pci_rootbridge(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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struct acpi_find_pci_root *find = (struct acpi_find_pci_root *)context;
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unsigned long seg, bus;
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acpi_status status;
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int tmp;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
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status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, &seg);
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if (status == AE_NOT_FOUND) {
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/* Assume seg = 0 */
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status = AE_OK;
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seg = 0;
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}
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if (ACPI_FAILURE(status)) {
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status = AE_CTRL_DEPTH;
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goto exit;
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}
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tmp = get_root_bridge_busnr(handle);
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if (tmp < 0) {
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printk(KERN_ERR PREFIX
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"Find root bridge failed for %s\n",
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(char *)buffer.pointer);
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status = AE_CTRL_DEPTH;
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goto exit;
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}
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bus = tmp;
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if (seg == find->seg && bus == find->bus)
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find->handle = handle;
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status = AE_OK;
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exit:
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acpi_os_free(buffer.pointer);
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return status;
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}
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acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
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{
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struct acpi_find_pci_root find = { seg, bus, NULL };
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acpi_get_devices(PCI_ROOT_HID_STRING, find_pci_rootbridge, &find, NULL);
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return find.handle;
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}
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EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
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/* Get device's handler per its address under its parent */
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struct acpi_find_child {
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acpi_handle handle;
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acpi_integer address;
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};
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static acpi_status
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do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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acpi_status status;
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struct acpi_device_info *info;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_find_child *find = (struct acpi_find_child *)context;
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status = acpi_get_object_info(handle, &buffer);
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if (ACPI_SUCCESS(status)) {
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info = buffer.pointer;
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if (info->address == find->address)
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find->handle = handle;
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acpi_os_free(buffer.pointer);
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}
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return AE_OK;
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}
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acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address)
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{
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struct acpi_find_child find = { NULL, address };
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if (!parent)
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return NULL;
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acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
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1, do_acpi_find_child, &find, NULL);
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return find.handle;
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}
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EXPORT_SYMBOL(acpi_get_child);
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/* Link ACPI devices with physical devices */
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static void acpi_glue_data_handler(acpi_handle handle,
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u32 function, void *context)
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{
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/* we provide an empty handler */
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}
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/* Note: a success call will increase reference count by one */
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struct device *acpi_get_physical_device(acpi_handle handle)
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{
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acpi_status status;
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struct device *dev;
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status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
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if (ACPI_SUCCESS(status))
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return get_device(dev);
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return NULL;
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}
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EXPORT_SYMBOL(acpi_get_physical_device);
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static int acpi_bind_one(struct device *dev, acpi_handle handle)
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{
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acpi_status status;
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if (dev->firmware_data) {
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printk(KERN_WARNING PREFIX
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"Drivers changed 'firmware_data' for %s\n", dev->bus_id);
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return -EINVAL;
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}
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get_device(dev);
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status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
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if (ACPI_FAILURE(status)) {
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put_device(dev);
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return -EINVAL;
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}
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dev->firmware_data = handle;
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return 0;
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}
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static int acpi_unbind_one(struct device *dev)
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{
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if (!dev->firmware_data)
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return 0;
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if (dev == acpi_get_physical_device(dev->firmware_data)) {
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/* acpi_get_physical_device increase refcnt by one */
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put_device(dev);
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acpi_detach_data(dev->firmware_data, acpi_glue_data_handler);
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dev->firmware_data = NULL;
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/* acpi_bind_one increase refcnt by one */
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put_device(dev);
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} else {
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printk(KERN_ERR PREFIX
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"Oops, 'firmware_data' corrupt for %s\n", dev->bus_id);
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}
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return 0;
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}
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static int acpi_platform_notify(struct device *dev)
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{
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struct acpi_bus_type *type;
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acpi_handle handle;
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int ret = -EINVAL;
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if (!dev->bus || !dev->parent) {
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/* bridge devices genernally haven't bus or parent */
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ret = acpi_find_bridge_device(dev, &handle);
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goto end;
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}
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type = acpi_get_bus_type(dev->bus);
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if (!type) {
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DBG("No ACPI bus support for %s\n", dev->bus_id);
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ret = -EINVAL;
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goto end;
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}
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if ((ret = type->find_device(dev, &handle)) != 0)
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DBG("Can't get handler for %s\n", dev->bus_id);
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end:
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if (!ret)
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acpi_bind_one(dev, handle);
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#if ACPI_GLUE_DEBUG
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if (!ret) {
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_get_name(dev->firmware_data, ACPI_FULL_PATHNAME, &buffer);
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DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer);
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acpi_os_free(buffer.pointer);
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} else
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DBG("Device %s -> No ACPI support\n", dev->bus_id);
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#endif
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return ret;
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}
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static int acpi_platform_notify_remove(struct device *dev)
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{
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acpi_unbind_one(dev);
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return 0;
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}
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static int __init init_acpi_device_notify(void)
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{
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if (acpi_disabled)
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return 0;
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if (platform_notify || platform_notify_remove) {
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printk(KERN_ERR PREFIX "Can't use platform_notify\n");
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return 0;
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}
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platform_notify = acpi_platform_notify;
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platform_notify_remove = acpi_platform_notify_remove;
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return 0;
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}
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arch_initcall(init_acpi_device_notify);
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