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1da177e4 LT |
1 | /* |
2 | * core.c - contains all core device and protocol registration functions | |
3 | * | |
4 | * Copyright 2002 Adam Belay <ambx1@neo.rr.com> | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <linux/pnp.h> | |
9 | #include <linux/types.h> | |
10 | #include <linux/list.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/errno.h> | |
17 | ||
18 | #include "base.h" | |
19 | ||
20 | ||
21 | static LIST_HEAD(pnp_protocols); | |
22 | LIST_HEAD(pnp_global); | |
23 | DEFINE_SPINLOCK(pnp_lock); | |
24 | ||
25 | void *pnp_alloc(long size) | |
26 | { | |
27 | void *result; | |
28 | ||
29 | result = kmalloc(size, GFP_KERNEL); | |
30 | if (!result){ | |
31 | printk(KERN_ERR "pnp: Out of Memory\n"); | |
32 | return NULL; | |
33 | } | |
34 | memset(result, 0, size); | |
35 | return result; | |
36 | } | |
37 | ||
38 | /** | |
39 | * pnp_protocol_register - adds a pnp protocol to the pnp layer | |
40 | * @protocol: pointer to the corresponding pnp_protocol structure | |
41 | * | |
42 | * Ex protocols: ISAPNP, PNPBIOS, etc | |
43 | */ | |
44 | ||
45 | int pnp_register_protocol(struct pnp_protocol *protocol) | |
46 | { | |
47 | int nodenum; | |
48 | struct list_head * pos; | |
49 | ||
50 | if (!protocol) | |
51 | return -EINVAL; | |
52 | ||
53 | INIT_LIST_HEAD(&protocol->devices); | |
54 | INIT_LIST_HEAD(&protocol->cards); | |
55 | nodenum = 0; | |
56 | spin_lock(&pnp_lock); | |
57 | ||
58 | /* assign the lowest unused number */ | |
59 | list_for_each(pos,&pnp_protocols) { | |
60 | struct pnp_protocol * cur = to_pnp_protocol(pos); | |
61 | if (cur->number == nodenum){ | |
62 | pos = &pnp_protocols; | |
63 | nodenum++; | |
64 | } | |
65 | } | |
66 | ||
67 | list_add_tail(&protocol->protocol_list, &pnp_protocols); | |
68 | spin_unlock(&pnp_lock); | |
69 | ||
70 | protocol->number = nodenum; | |
71 | sprintf(protocol->dev.bus_id, "pnp%d", nodenum); | |
72 | return device_register(&protocol->dev); | |
73 | } | |
74 | ||
75 | /** | |
76 | * pnp_protocol_unregister - removes a pnp protocol from the pnp layer | |
77 | * @protocol: pointer to the corresponding pnp_protocol structure | |
78 | * | |
79 | */ | |
80 | void pnp_unregister_protocol(struct pnp_protocol *protocol) | |
81 | { | |
82 | spin_lock(&pnp_lock); | |
83 | list_del(&protocol->protocol_list); | |
84 | spin_unlock(&pnp_lock); | |
85 | device_unregister(&protocol->dev); | |
86 | } | |
87 | ||
88 | ||
89 | static void pnp_free_ids(struct pnp_dev *dev) | |
90 | { | |
91 | struct pnp_id * id; | |
92 | struct pnp_id * next; | |
93 | if (!dev) | |
94 | return; | |
95 | id = dev->id; | |
96 | while (id) { | |
97 | next = id->next; | |
98 | kfree(id); | |
99 | id = next; | |
100 | } | |
101 | } | |
102 | ||
103 | static void pnp_release_device(struct device *dmdev) | |
104 | { | |
105 | struct pnp_dev * dev = to_pnp_dev(dmdev); | |
106 | pnp_free_option(dev->independent); | |
107 | pnp_free_option(dev->dependent); | |
108 | pnp_free_ids(dev); | |
109 | kfree(dev); | |
110 | } | |
111 | ||
112 | int __pnp_add_device(struct pnp_dev *dev) | |
113 | { | |
114 | int ret; | |
115 | pnp_fixup_device(dev); | |
116 | dev->dev.bus = &pnp_bus_type; | |
117 | dev->dev.release = &pnp_release_device; | |
118 | dev->status = PNP_READY; | |
119 | spin_lock(&pnp_lock); | |
120 | list_add_tail(&dev->global_list, &pnp_global); | |
121 | list_add_tail(&dev->protocol_list, &dev->protocol->devices); | |
122 | spin_unlock(&pnp_lock); | |
123 | ||
124 | ret = device_register(&dev->dev); | |
125 | if (ret == 0) | |
126 | pnp_interface_attach_device(dev); | |
127 | return ret; | |
128 | } | |
129 | ||
130 | /* | |
131 | * pnp_add_device - adds a pnp device to the pnp layer | |
132 | * @dev: pointer to dev to add | |
133 | * | |
134 | * adds to driver model, name database, fixups, interface, etc. | |
135 | */ | |
136 | ||
137 | int pnp_add_device(struct pnp_dev *dev) | |
138 | { | |
139 | if (!dev || !dev->protocol || dev->card) | |
140 | return -EINVAL; | |
141 | dev->dev.parent = &dev->protocol->dev; | |
142 | sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number, dev->number); | |
143 | return __pnp_add_device(dev); | |
144 | } | |
145 | ||
146 | void __pnp_remove_device(struct pnp_dev *dev) | |
147 | { | |
148 | spin_lock(&pnp_lock); | |
149 | list_del(&dev->global_list); | |
150 | list_del(&dev->protocol_list); | |
151 | spin_unlock(&pnp_lock); | |
152 | device_unregister(&dev->dev); | |
153 | } | |
154 | ||
155 | /** | |
156 | * pnp_remove_device - removes a pnp device from the pnp layer | |
157 | * @dev: pointer to dev to add | |
158 | * | |
159 | * this function will free all mem used by dev | |
160 | */ | |
b449f63c | 161 | #if 0 |
1da177e4 LT |
162 | void pnp_remove_device(struct pnp_dev *dev) |
163 | { | |
164 | if (!dev || dev->card) | |
165 | return; | |
166 | __pnp_remove_device(dev); | |
167 | } | |
b449f63c | 168 | #endif /* 0 */ |
1da177e4 LT |
169 | |
170 | static int __init pnp_init(void) | |
171 | { | |
172 | printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n"); | |
173 | return bus_register(&pnp_bus_type); | |
174 | } | |
175 | ||
176 | subsys_initcall(pnp_init); | |
177 | ||
b449f63c | 178 | #if 0 |
1da177e4 LT |
179 | EXPORT_SYMBOL(pnp_register_protocol); |
180 | EXPORT_SYMBOL(pnp_unregister_protocol); | |
181 | EXPORT_SYMBOL(pnp_add_device); | |
182 | EXPORT_SYMBOL(pnp_remove_device); | |
b449f63c | 183 | #endif /* 0 */ |