Linux-2.6.12-rc2
[linux-2.6.git] / drivers / pnp / core.c
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  */
161
162 void pnp_remove_device(struct pnp_dev *dev)
163 {
164         if (!dev || dev->card)
165                 return;
166         __pnp_remove_device(dev);
167 }
168
169 static int __init pnp_init(void)
170 {
171         printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
172         return bus_register(&pnp_bus_type);
173 }
174
175 subsys_initcall(pnp_init);
176
177 EXPORT_SYMBOL(pnp_register_protocol);
178 EXPORT_SYMBOL(pnp_unregister_protocol);
179 EXPORT_SYMBOL(pnp_add_device);
180 EXPORT_SYMBOL(pnp_remove_device);