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https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-09 01:28:05 -04:00
Fixed MTP to work with TWRP
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awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
219
drivers/acpi/pci_slot.c
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219
drivers/acpi/pci_slot.c
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/*
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* pci_slot.c - ACPI PCI Slot Driver
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*
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* The code here is heavily leveraged from the acpiphp module.
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* Thanks to Matthew Wilcox <matthew@wil.cx> for much guidance.
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* Thanks to Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> for code
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* review and fixes.
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*
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* Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P.
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* Alex Chiang <achiang@hp.com>
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*
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* Copyright (C) 2013 Huawei Tech. Co., Ltd.
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* Jiang Liu <jiang.liu@huawei.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/pci.h>
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#include <linux/acpi.h>
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#include <linux/dmi.h>
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#include <linux/pci-acpi.h>
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static bool debug;
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static int check_sta_before_sun;
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#define DRIVER_VERSION "0.1"
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#define DRIVER_AUTHOR "Alex Chiang <achiang@hp.com>"
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#define DRIVER_DESC "ACPI PCI Slot Detection Driver"
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
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module_param(debug, bool, 0644);
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#define _COMPONENT ACPI_PCI_COMPONENT
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ACPI_MODULE_NAME("pci_slot");
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#define MY_NAME "pci_slot"
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#define err(format, arg...) pr_err("%s: " format , MY_NAME , ## arg)
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#define info(format, arg...) pr_info("%s: " format , MY_NAME , ## arg)
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#define dbg(format, arg...) \
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do { \
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if (debug) \
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pr_debug("%s: " format, MY_NAME , ## arg); \
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} while (0)
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#define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */
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struct acpi_pci_slot {
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struct pci_slot *pci_slot; /* corresponding pci_slot */
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struct list_head list; /* node in the list of slots */
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};
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static LIST_HEAD(slot_list);
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static DEFINE_MUTEX(slot_list_lock);
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static int
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check_slot(acpi_handle handle, unsigned long long *sun)
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{
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int device = -1;
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unsigned long long adr, sta;
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acpi_status status;
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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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dbg("Checking slot on path: %s\n", (char *)buffer.pointer);
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if (check_sta_before_sun) {
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/* If SxFy doesn't have _STA, we just assume it's there */
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status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
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if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT))
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goto out;
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}
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status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
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if (ACPI_FAILURE(status)) {
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dbg("_ADR returned %d on %s\n", status, (char *)buffer.pointer);
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goto out;
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}
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/* No _SUN == not a slot == bail */
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status = acpi_evaluate_integer(handle, "_SUN", NULL, sun);
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if (ACPI_FAILURE(status)) {
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dbg("_SUN returned %d on %s\n", status, (char *)buffer.pointer);
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goto out;
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}
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device = (adr >> 16) & 0xffff;
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out:
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kfree(buffer.pointer);
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return device;
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}
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/*
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* Check whether handle has an associated slot and create PCI slot if it has.
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*/
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static acpi_status
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register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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int device;
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unsigned long long sun;
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char name[SLOT_NAME_SIZE];
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struct acpi_pci_slot *slot;
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struct pci_slot *pci_slot;
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struct pci_bus *pci_bus = context;
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device = check_slot(handle, &sun);
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if (device < 0)
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return AE_OK;
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/*
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* There may be multiple PCI functions associated with the same slot.
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* Check whether PCI slot has already been created for this PCI device.
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*/
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list_for_each_entry(slot, &slot_list, list) {
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pci_slot = slot->pci_slot;
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if (pci_slot->bus == pci_bus && pci_slot->number == device)
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return AE_OK;
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}
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slot = kmalloc(sizeof(*slot), GFP_KERNEL);
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if (!slot) {
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err("%s: cannot allocate memory\n", __func__);
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return AE_OK;
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}
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snprintf(name, sizeof(name), "%llu", sun);
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pci_slot = pci_create_slot(pci_bus, device, name, NULL);
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if (IS_ERR(pci_slot)) {
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err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
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kfree(slot);
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return AE_OK;
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}
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slot->pci_slot = pci_slot;
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list_add(&slot->list, &slot_list);
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get_device(&pci_bus->dev);
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dbg("pci_slot: %p, pci_bus: %x, device: %d, name: %s\n",
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pci_slot, pci_bus->number, device, name);
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return AE_OK;
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}
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void acpi_pci_slot_enumerate(struct pci_bus *bus)
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{
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acpi_handle handle = ACPI_HANDLE(bus->bridge);
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if (handle) {
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mutex_lock(&slot_list_lock);
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acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
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register_slot, NULL, bus, NULL);
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mutex_unlock(&slot_list_lock);
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}
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}
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void acpi_pci_slot_remove(struct pci_bus *bus)
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{
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struct acpi_pci_slot *slot, *tmp;
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mutex_lock(&slot_list_lock);
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list_for_each_entry_safe(slot, tmp, &slot_list, list) {
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if (slot->pci_slot->bus == bus) {
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list_del(&slot->list);
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pci_destroy_slot(slot->pci_slot);
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put_device(&bus->dev);
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kfree(slot);
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}
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}
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mutex_unlock(&slot_list_lock);
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}
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static int do_sta_before_sun(const struct dmi_system_id *d)
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{
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info("%s detected: will evaluate _STA before calling _SUN\n", d->ident);
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check_sta_before_sun = 1;
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return 0;
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}
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static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = {
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/*
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* Fujitsu Primequest machines will return 1023 to indicate an
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* error if the _SUN method is evaluated on SxFy objects that
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* are not present (as indicated by _STA), so for those machines,
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* we want to check _STA before evaluating _SUN.
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*/
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{
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.callback = do_sta_before_sun,
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.ident = "Fujitsu PRIMEQUEST",
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.matches = {
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DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"),
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DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"),
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},
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},
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{}
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};
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void __init acpi_pci_slot_init(void)
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{
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dmi_check_system(acpi_pci_slot_dmi_table);
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}
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