n_tty: signal and flush atomically
[linux-2.6-block.git] / drivers / acpi / pci_slot.c
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1/*
2 * pci_slot.c - ACPI PCI Slot Driver
3 *
4 * The code here is heavily leveraged from the acpiphp module.
5 * Thanks to Matthew Wilcox <matthew@wil.cx> for much guidance.
6 * Thanks to Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> for code
7 * review and fixes.
8 *
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9 * Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P.
10 * Alex Chiang <achiang@hp.com>
8344b568 11 *
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12 * Copyright (C) 2013 Huawei Tech. Co., Ltd.
13 * Jiang Liu <jiang.liu@huawei.com>
14 *
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15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms and conditions of the GNU General Public License,
17 * version 2, as published by the Free Software Foundation.
18 *
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 * General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License along
25 * with this program; if not, write to the Free Software Foundation, Inc.,
26 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
27 */
28
29#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/init.h>
5a0e3ad6 32#include <linux/slab.h>
8344b568 33#include <linux/types.h>
5c0b04e3 34#include <linux/list.h>
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35#include <linux/pci.h>
36#include <linux/acpi.h>
eb27cae8 37#include <linux/dmi.h>
e22e58a4 38#include <linux/pci-acpi.h>
8344b568 39
90ab5ee9 40static bool debug;
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41static int check_sta_before_sun;
42
43#define DRIVER_VERSION "0.1"
44#define DRIVER_AUTHOR "Alex Chiang <achiang@hp.com>"
45#define DRIVER_DESC "ACPI PCI Slot Detection Driver"
46MODULE_AUTHOR(DRIVER_AUTHOR);
47MODULE_DESCRIPTION(DRIVER_DESC);
48MODULE_LICENSE("GPL");
49MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
50module_param(debug, bool, 0644);
51
52#define _COMPONENT ACPI_PCI_COMPONENT
53ACPI_MODULE_NAME("pci_slot");
54
55#define MY_NAME "pci_slot"
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56#define err(format, arg...) pr_err("%s: " format , MY_NAME , ## arg)
57#define info(format, arg...) pr_info("%s: " format , MY_NAME , ## arg)
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58#define dbg(format, arg...) \
59 do { \
60 if (debug) \
73ce873a 61 pr_debug("%s: " format, MY_NAME , ## arg); \
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62 } while (0)
63
7e24bc1c 64#define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */
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65
66struct acpi_pci_slot {
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67 struct pci_slot *pci_slot; /* corresponding pci_slot */
68 struct list_head list; /* node in the list of slots */
69};
70
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71static LIST_HEAD(slot_list);
72static DEFINE_MUTEX(slot_list_lock);
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73
74static int
27663c58 75check_slot(acpi_handle handle, unsigned long long *sun)
8344b568 76{
362b7077 77 int device = -1;
27663c58 78 unsigned long long adr, sta;
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79 acpi_status status;
80 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
81
82 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
83 dbg("Checking slot on path: %s\n", (char *)buffer.pointer);
84
85 if (check_sta_before_sun) {
86 /* If SxFy doesn't have _STA, we just assume it's there */
87 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
362b7077 88 if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT))
8344b568 89 goto out;
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90 }
91
92 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
93 if (ACPI_FAILURE(status)) {
94 dbg("_ADR returned %d on %s\n", status, (char *)buffer.pointer);
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95 goto out;
96 }
97
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98 /* No _SUN == not a slot == bail */
99 status = acpi_evaluate_integer(handle, "_SUN", NULL, sun);
100 if (ACPI_FAILURE(status)) {
101 dbg("_SUN returned %d on %s\n", status, (char *)buffer.pointer);
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102 goto out;
103 }
104
362b7077 105 device = (adr >> 16) & 0xffff;
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106out:
107 kfree(buffer.pointer);
362b7077 108 return device;
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109}
110
8344b568 111/*
5c0b04e3 112 * Check whether handle has an associated slot and create PCI slot if it has.
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113 */
114static acpi_status
115register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
116{
117 int device;
27663c58 118 unsigned long long sun;
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119 char name[SLOT_NAME_SIZE];
120 struct acpi_pci_slot *slot;
121 struct pci_slot *pci_slot;
5c0b04e3 122 struct pci_bus *pci_bus = context;
8344b568 123
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124 device = check_slot(handle, &sun);
125 if (device < 0)
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126 return AE_OK;
127
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128 /*
129 * There may be multiple PCI functions associated with the same slot.
130 * Check whether PCI slot has already been created for this PCI device.
131 */
132 list_for_each_entry(slot, &slot_list, list) {
133 pci_slot = slot->pci_slot;
134 if (pci_slot->bus == pci_bus && pci_slot->number == device)
135 return AE_OK;
136 }
137
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138 slot = kmalloc(sizeof(*slot), GFP_KERNEL);
139 if (!slot) {
140 err("%s: cannot allocate memory\n", __func__);
141 return AE_OK;
142 }
143
7e24bc1c 144 snprintf(name, sizeof(name), "%llu", sun);
828f3768 145 pci_slot = pci_create_slot(pci_bus, device, name, NULL);
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146 if (IS_ERR(pci_slot)) {
147 err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
148 kfree(slot);
e4268aad 149 return AE_OK;
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150 }
151
8344b568 152 slot->pci_slot = pci_slot;
8344b568 153 list_add(&slot->list, &slot_list);
8344b568 154
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155 get_device(&pci_bus->dev);
156
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157 dbg("pci_slot: %p, pci_bus: %x, device: %d, name: %s\n",
158 pci_slot, pci_bus->number, device, name);
159
160 return AE_OK;
161}
162
be1c9de9 163void acpi_pci_slot_enumerate(struct pci_bus *bus)
8344b568 164{
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165 acpi_handle handle = ACPI_HANDLE(bus->bridge);
166
167 if (handle) {
168 mutex_lock(&slot_list_lock);
169 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
170 register_slot, NULL, bus, NULL);
171 mutex_unlock(&slot_list_lock);
172 }
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173}
174
5c0b04e3 175void acpi_pci_slot_remove(struct pci_bus *bus)
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176{
177 struct acpi_pci_slot *slot, *tmp;
178
179 mutex_lock(&slot_list_lock);
180 list_for_each_entry_safe(slot, tmp, &slot_list, list) {
5c0b04e3 181 if (slot->pci_slot->bus == bus) {
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182 list_del(&slot->list);
183 pci_destroy_slot(slot->pci_slot);
5c0b04e3 184 put_device(&bus->dev);
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185 kfree(slot);
186 }
187 }
188 mutex_unlock(&slot_list_lock);
189}
190
191static int do_sta_before_sun(const struct dmi_system_id *d)
192{
193 info("%s detected: will evaluate _STA before calling _SUN\n", d->ident);
194 check_sta_before_sun = 1;
195 return 0;
196}
197
198static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = {
199 /*
200 * Fujitsu Primequest machines will return 1023 to indicate an
201 * error if the _SUN method is evaluated on SxFy objects that
202 * are not present (as indicated by _STA), so for those machines,
203 * we want to check _STA before evaluating _SUN.
204 */
205 {
206 .callback = do_sta_before_sun,
207 .ident = "Fujitsu PRIMEQUEST",
208 .matches = {
209 DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"),
210 DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"),
211 },
212 },
213 {}
214};
215
ab1a2e03 216void __init acpi_pci_slot_init(void)
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217{
218 dmi_check_system(acpi_pci_slot_dmi_table);
8344b568 219}