Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / 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 #include <linux/dma-mapping.h>
18
19 #include "base.h"
20
21
22 static LIST_HEAD(pnp_protocols);
23 LIST_HEAD(pnp_global);
24 DEFINE_SPINLOCK(pnp_lock);
25
26 /*
27  * ACPI or PNPBIOS should tell us about all platform devices, so we can
28  * skip some blind probes.  ISAPNP typically enumerates only plug-in ISA
29  * devices, not built-in things like COM ports.
30  */
31 int pnp_platform_devices;
32 EXPORT_SYMBOL(pnp_platform_devices);
33
34 void *pnp_alloc(long size)
35 {
36         void *result;
37
38         result = kmalloc(size, GFP_KERNEL);
39         if (!result){
40                 printk(KERN_ERR "pnp: Out of Memory\n");
41                 return NULL;
42         }
43         memset(result, 0, size);
44         return result;
45 }
46
47 /**
48  * pnp_protocol_register - adds a pnp protocol to the pnp layer
49  * @protocol: pointer to the corresponding pnp_protocol structure
50  *
51  *  Ex protocols: ISAPNP, PNPBIOS, etc
52  */
53
54 int pnp_register_protocol(struct pnp_protocol *protocol)
55 {
56         int nodenum;
57         struct list_head * pos;
58
59         if (!protocol)
60                 return -EINVAL;
61
62         INIT_LIST_HEAD(&protocol->devices);
63         INIT_LIST_HEAD(&protocol->cards);
64         nodenum = 0;
65         spin_lock(&pnp_lock);
66
67         /* assign the lowest unused number */
68         list_for_each(pos,&pnp_protocols) {
69                 struct pnp_protocol * cur = to_pnp_protocol(pos);
70                 if (cur->number == nodenum){
71                         pos = &pnp_protocols;
72                         nodenum++;
73                 }
74         }
75
76         list_add_tail(&protocol->protocol_list, &pnp_protocols);
77         spin_unlock(&pnp_lock);
78
79         protocol->number = nodenum;
80         sprintf(protocol->dev.bus_id, "pnp%d", nodenum);
81         return device_register(&protocol->dev);
82 }
83
84 /**
85  * pnp_protocol_unregister - removes a pnp protocol from the pnp layer
86  * @protocol: pointer to the corresponding pnp_protocol structure
87  *
88  */
89 void pnp_unregister_protocol(struct pnp_protocol *protocol)
90 {
91         spin_lock(&pnp_lock);
92         list_del(&protocol->protocol_list);
93         spin_unlock(&pnp_lock);
94         device_unregister(&protocol->dev);
95 }
96
97
98 static void pnp_free_ids(struct pnp_dev *dev)
99 {
100         struct pnp_id * id;
101         struct pnp_id * next;
102         if (!dev)
103                 return;
104         id = dev->id;
105         while (id) {
106                 next = id->next;
107                 kfree(id);
108                 id = next;
109         }
110 }
111
112 static void pnp_release_device(struct device *dmdev)
113 {
114         struct pnp_dev * dev = to_pnp_dev(dmdev);
115         pnp_free_option(dev->independent);
116         pnp_free_option(dev->dependent);
117         pnp_free_ids(dev);
118         kfree(dev);
119 }
120
121 int __pnp_add_device(struct pnp_dev *dev)
122 {
123         int ret;
124         pnp_fixup_device(dev);
125         dev->dev.bus = &pnp_bus_type;
126         dev->dev.dma_mask = &dev->dma_mask;
127         dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK;
128         dev->dev.release = &pnp_release_device;
129         dev->status = PNP_READY;
130         spin_lock(&pnp_lock);
131         list_add_tail(&dev->global_list, &pnp_global);
132         list_add_tail(&dev->protocol_list, &dev->protocol->devices);
133         spin_unlock(&pnp_lock);
134
135         ret = device_register(&dev->dev);
136         if (ret == 0)
137                 pnp_interface_attach_device(dev);
138         return ret;
139 }
140
141 /*
142  * pnp_add_device - adds a pnp device to the pnp layer
143  * @dev: pointer to dev to add
144  *
145  *  adds to driver model, name database, fixups, interface, etc.
146  */
147
148 int pnp_add_device(struct pnp_dev *dev)
149 {
150         if (!dev || !dev->protocol || dev->card)
151                 return -EINVAL;
152         dev->dev.parent = &dev->protocol->dev;
153         sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number, dev->number);
154         return __pnp_add_device(dev);
155 }
156
157 void __pnp_remove_device(struct pnp_dev *dev)
158 {
159         spin_lock(&pnp_lock);
160         list_del(&dev->global_list);
161         list_del(&dev->protocol_list);
162         spin_unlock(&pnp_lock);
163         device_unregister(&dev->dev);
164 }
165
166 /**
167  * pnp_remove_device - removes a pnp device from the pnp layer
168  * @dev: pointer to dev to add
169  *
170  * this function will free all mem used by dev
171  */
172 #if 0
173 void pnp_remove_device(struct pnp_dev *dev)
174 {
175         if (!dev || dev->card)
176                 return;
177         __pnp_remove_device(dev);
178 }
179 #endif  /*  0  */
180
181 static int __init pnp_init(void)
182 {
183         printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
184         return bus_register(&pnp_bus_type);
185 }
186
187 subsys_initcall(pnp_init);
188
189 #if 0
190 EXPORT_SYMBOL(pnp_register_protocol);
191 EXPORT_SYMBOL(pnp_unregister_protocol);
192 EXPORT_SYMBOL(pnp_add_device);
193 EXPORT_SYMBOL(pnp_remove_device);
194 #endif  /*  0  */