1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * ACPI PCI Hot Plug Controller Driver
4 *
5 * Copyright (C) 1995,2001 Compaq Computer Corporation
6 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
7 * Copyright (C) 2001 IBM Corp.
8 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
9 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
10 * Copyright (C) 2002,2003 NEC Corporation
11 * Copyright (C) 2003-2005 Matthew Wilcox (willy@infradead.org)
12 * Copyright (C) 2003-2005 Hewlett Packard
13 *
14 * All rights reserved.
15 *
16 * Send feedback to <gregkh@us.ibm.com>,
17 * <t-kochi@bq.jp.nec.com>
18 *
19 */
20
21 #ifndef _ACPIPHP_H
22 #define _ACPIPHP_H
23
24 #include <linux/acpi.h>
25 #include <linux/mutex.h>
26 #include <linux/pci_hotplug.h>
27
28 struct acpiphp_context;
29 struct acpiphp_bridge;
30 struct acpiphp_slot;
31
32 /*
33 * struct slot - slot information for each *physical* slot
34 */
35 struct slot {
36 struct hotplug_slot hotplug_slot;
37 struct acpiphp_slot *acpi_slot;
38 unsigned int sun; /* ACPI _SUN (Slot User Number) value */
39 };
40
slot_name(struct slot * slot)41 static inline const char *slot_name(struct slot *slot)
42 {
43 return hotplug_slot_name(&slot->hotplug_slot);
44 }
45
to_slot(struct hotplug_slot * hotplug_slot)46 static inline struct slot *to_slot(struct hotplug_slot *hotplug_slot)
47 {
48 return container_of(hotplug_slot, struct slot, hotplug_slot);
49 }
50
51 /*
52 * struct acpiphp_bridge - PCI bridge information
53 *
54 * for each bridge device in ACPI namespace
55 */
56 struct acpiphp_bridge {
57 struct list_head list;
58 struct list_head slots;
59 struct kref ref;
60
61 struct acpiphp_context *context;
62
63 int nr_slots;
64
65 /* This bus (host bridge) or Secondary bus (PCI-to-PCI bridge) */
66 struct pci_bus *pci_bus;
67
68 /* PCI-to-PCI bridge device */
69 struct pci_dev *pci_dev;
70
71 bool is_going_away;
72 };
73
74
75 /*
76 * struct acpiphp_slot - PCI slot information
77 *
78 * PCI slot information for each *physical* PCI slot
79 */
80 struct acpiphp_slot {
81 struct list_head node;
82 struct pci_bus *bus;
83 struct list_head funcs; /* one slot may have different
84 objects (i.e. for each function) */
85 struct slot *slot;
86
87 u8 device; /* pci device# */
88 u32 flags; /* see below */
89 };
90
91
92 /*
93 * struct acpiphp_func - PCI function information
94 *
95 * PCI function information for each object in ACPI namespace
96 * typically 8 objects per slot (i.e. for each PCI function)
97 */
98 struct acpiphp_func {
99 struct acpiphp_bridge *parent;
100 struct acpiphp_slot *slot;
101
102 struct list_head sibling;
103
104 u8 function; /* pci function# */
105 u32 flags; /* see below */
106 };
107
108 struct acpiphp_context {
109 struct acpi_hotplug_context hp;
110 struct acpiphp_func func;
111 struct acpiphp_bridge *bridge;
112 unsigned int refcount;
113 };
114
to_acpiphp_context(struct acpi_hotplug_context * hp)115 static inline struct acpiphp_context *to_acpiphp_context(struct acpi_hotplug_context *hp)
116 {
117 return container_of(hp, struct acpiphp_context, hp);
118 }
119
func_to_context(struct acpiphp_func * func)120 static inline struct acpiphp_context *func_to_context(struct acpiphp_func *func)
121 {
122 return container_of(func, struct acpiphp_context, func);
123 }
124
func_to_acpi_device(struct acpiphp_func * func)125 static inline struct acpi_device *func_to_acpi_device(struct acpiphp_func *func)
126 {
127 return func_to_context(func)->hp.self;
128 }
129
func_to_handle(struct acpiphp_func * func)130 static inline acpi_handle func_to_handle(struct acpiphp_func *func)
131 {
132 return func_to_acpi_device(func)->handle;
133 }
134
135 struct acpiphp_root_context {
136 struct acpi_hotplug_context hp;
137 struct acpiphp_bridge *root_bridge;
138 };
139
to_acpiphp_root_context(struct acpi_hotplug_context * hp)140 static inline struct acpiphp_root_context *to_acpiphp_root_context(struct acpi_hotplug_context *hp)
141 {
142 return container_of(hp, struct acpiphp_root_context, hp);
143 }
144
145 /*
146 * struct acpiphp_attention_info - device specific attention registration
147 *
148 * ACPI has no generic method of setting/getting attention status
149 * this allows for device specific driver registration
150 */
151 struct acpiphp_attention_info
152 {
153 int (*set_attn)(struct hotplug_slot *slot, u8 status);
154 int (*get_attn)(struct hotplug_slot *slot, u8 *status);
155 struct module *owner;
156 };
157
158 /* ACPI _STA method value (ignore bit 4; battery present) */
159 #define ACPI_STA_ALL (0x0000000f)
160
161 /* slot flags */
162
163 #define SLOT_ENABLED (0x00000001)
164 #define SLOT_IS_GOING_AWAY (0x00000002)
165
166 /* function flags */
167
168 #define FUNC_HAS_STA (0x00000001)
169 #define FUNC_HAS_EJ0 (0x00000002)
170
171 /* function prototypes */
172
173 /* acpiphp_core.c */
174 int acpiphp_register_attention(struct acpiphp_attention_info *info);
175 int acpiphp_unregister_attention(struct acpiphp_attention_info *info);
176 int acpiphp_register_hotplug_slot(struct acpiphp_slot *slot, unsigned int sun);
177 void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *slot);
178
179 /* acpiphp_glue.c */
180 typedef int (*acpiphp_callback)(struct acpiphp_slot *slot, void *data);
181
182 int acpiphp_enable_slot(struct acpiphp_slot *slot);
183 int acpiphp_disable_slot(struct acpiphp_slot *slot);
184 u8 acpiphp_get_power_status(struct acpiphp_slot *slot);
185 u8 acpiphp_get_attention_status(struct acpiphp_slot *slot);
186 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot);
187 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot);
188
189 /* variables */
190 extern bool acpiphp_disabled;
191
192 #endif /* _ACPIPHP_H */
193