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29#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/slab.h>
33#include <linux/types.h>
34#include <linux/list.h>
35#include <linux/pci.h>
36#include <linux/acpi.h>
37#include <linux/dmi.h>
38#include <linux/pci-acpi.h>
39
40static bool debug;
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"
56#define err(format, arg...) pr_err("%s: " format , MY_NAME , ## arg)
57#define info(format, arg...) pr_info("%s: " format , MY_NAME , ## arg)
58#define dbg(format, arg...) \
59 do { \
60 if (debug) \
61 pr_debug("%s: " format, MY_NAME , ## arg); \
62 } while (0)
63
64#define SLOT_NAME_SIZE 21
65
66struct acpi_pci_slot {
67 struct pci_slot *pci_slot;
68 struct list_head list;
69};
70
71static LIST_HEAD(slot_list);
72static DEFINE_MUTEX(slot_list_lock);
73
74static int
75check_slot(acpi_handle handle, unsigned long long *sun)
76{
77 int device = -1;
78 unsigned long long adr, sta;
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
87 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
88 if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT))
89 goto out;
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);
95 goto out;
96 }
97
98
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);
102 goto out;
103 }
104
105 device = (adr >> 16) & 0xffff;
106out:
107 kfree(buffer.pointer);
108 return device;
109}
110
111
112
113
114static acpi_status
115register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
116{
117 int device;
118 unsigned long long sun;
119 char name[SLOT_NAME_SIZE];
120 struct acpi_pci_slot *slot;
121 struct pci_slot *pci_slot;
122 struct pci_bus *pci_bus = context;
123
124 device = check_slot(handle, &sun);
125 if (device < 0)
126 return AE_OK;
127
128
129
130
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
138 slot = kmalloc(sizeof(*slot), GFP_KERNEL);
139 if (!slot) {
140 err("%s: cannot allocate memory\n", __func__);
141 return AE_OK;
142 }
143
144 snprintf(name, sizeof(name), "%llu", sun);
145 pci_slot = pci_create_slot(pci_bus, device, name, NULL);
146 if (IS_ERR(pci_slot)) {
147 err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot));
148 kfree(slot);
149 return AE_OK;
150 }
151
152 slot->pci_slot = pci_slot;
153 list_add(&slot->list, &slot_list);
154
155 get_device(&pci_bus->dev);
156
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
163void acpi_pci_slot_enumerate(struct pci_bus *bus)
164{
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 }
173}
174
175void acpi_pci_slot_remove(struct pci_bus *bus)
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) {
181 if (slot->pci_slot->bus == bus) {
182 list_del(&slot->list);
183 pci_destroy_slot(slot->pci_slot);
184 put_device(&bus->dev);
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
201
202
203
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
216void __init acpi_pci_slot_init(void)
217{
218 dmi_check_system(acpi_pci_slot_dmi_table);
219}
220