linux-imx

/*

 *  pci_slot.c - ACPI PCI Slot Driver

 *

 *  The code here is heavily leveraged from the acpiphp module.

 *  Thanks to Matthew Wilcox <matthew@wil.cx> for much guidance.

 *  Thanks to Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> for code

 *  review and fixes.

 *

 *  Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P.

 *      Alex Chiang <achiang@hp.com>

 *

 *  Copyright (C) 2013 Huawei Tech. Co., Ltd.

 *  Jiang Liu <jiang.liu@huawei.com>

 *

 *  This program is free software; you can redistribute it and/or modify it

 *  under the terms and conditions of the GNU General Public License,

 *  version 2, as published by the Free Software Foundation.

 *

 *  This program is distributed in the hope that it will be useful, but

 *  WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 *  General Public License for more details.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/types.h>

#include <linux/list.h>

#include <linux/pci.h>

#include <linux/acpi.h>

#include <linux/dmi.h>

#include <linux/pci-acpi.h>

​

static int check_sta_before_sun;

​

#define _COMPONENT      ACPI_PCI_COMPONENT

ACPI_MODULE_NAME("pci_slot");

​

#define SLOT_NAME_SIZE 21       /* Inspired by #define in acpiphp.h */

​

struct acpi_pci_slot {

    struct pci_slot *pci_slot;  /* corresponding pci_slot */

    struct list_head list;      /* node in the list of slots */

};

​

static LIST_HEAD(slot_list);

static DEFINE_MUTEX(slot_list_lock);

​

static int

check_slot(acpi_handle handle, unsigned long long *sun)

{

    int device = -1;

    unsigned long long adr, sta;

    acpi_status status;

    struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

​

    acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);

    pr_debug("Checking slot on path: %s\n", (char *)buffer.pointer);

​

    if (check_sta_before_sun) {