Fix common misspellings
[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 #include <linux/pnp.h>
8 #include <linux/types.h>
9 #include <linux/list.h>
10 #include <linux/device.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/string.h>
14 #include <linux/slab.h>
15 #include <linux/errno.h>
16 #include <linux/dma-mapping.h>
17
18 #include "base.h"
19
20 static LIST_HEAD(pnp_protocols);
21 LIST_HEAD(pnp_global);
22 DEFINE_SPINLOCK(pnp_lock);
23
24 /*
25  * ACPI or PNPBIOS should tell us about all platform devices, so we can
26  * skip some blind probes.  ISAPNP typically enumerates only plug-in ISA
27  * devices, not built-in things like COM ports.
28  */
29 int pnp_platform_devices;
30 EXPORT_SYMBOL(pnp_platform_devices);
31
32 void *pnp_alloc(long size)
33 {
34         void *result;
35
36         result = kzalloc(size, GFP_KERNEL);
37         if (!result) {
38                 printk(KERN_ERR "pnp: Out of Memory\n");
39                 return NULL;
40         }
41         return result;
42 }
43
44 /**
45  * pnp_protocol_register - adds a pnp protocol to the pnp layer
46  * @protocol: pointer to the corresponding pnp_protocol structure
47  *
48  *  Ex protocols: ISAPNP, PNPBIOS, etc
49  */
50 int pnp_register_protocol(struct pnp_protocol *protocol)
51 {
52         int nodenum;
53         struct list_head *pos;
54
55         INIT_LIST_HEAD(&protocol->devices);
56         INIT_LIST_HEAD(&protocol->cards);
57         nodenum = 0;
58         spin_lock(&pnp_lock);
59
60         /* assign the lowest unused number */
61         list_for_each(pos, &pnp_protocols) {
62                 struct pnp_protocol *cur = to_pnp_protocol(pos);
63                 if (cur->number == nodenum) {
64                         pos = &pnp_protocols;
65                         nodenum++;
66                 }
67         }
68
69         list_add_tail(&protocol->protocol_list, &pnp_protocols);
70         spin_unlock(&pnp_lock);
71
72         protocol->number = nodenum;
73         dev_set_name(&protocol->dev, "pnp%d", nodenum);
74         return device_register(&protocol->dev);
75 }
76
77 /**
78  * pnp_protocol_unregister - removes a pnp protocol from the pnp layer
79  * @protocol: pointer to the corresponding pnp_protocol structure
80  */
81 void pnp_unregister_protocol(struct pnp_protocol *protocol)
82 {
83         spin_lock(&pnp_lock);
84         list_del(&protocol->protocol_list);
85         spin_unlock(&pnp_lock);
86         device_unregister(&protocol->dev);
87 }
88
89 static void pnp_free_ids(struct pnp_dev *dev)
90 {
91         struct pnp_id *id;
92         struct pnp_id *next;
93
94         id = dev->id;
95         while (id) {
96                 next = id->next;
97                 kfree(id);
98                 id = next;
99         }
100 }
101
102 void pnp_free_resource(struct pnp_resource *pnp_res)
103 {
104         list_del(&pnp_res->list);
105         kfree(pnp_res);
106 }
107
108 void pnp_free_resources(struct pnp_dev *dev)
109 {
110         struct pnp_resource *pnp_res, *tmp;
111
112         list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
113                 pnp_free_resource(pnp_res);
114         }
115 }
116
117 static void pnp_release_device(struct device *dmdev)
118 {
119         struct pnp_dev *dev = to_pnp_dev(dmdev);
120
121         pnp_free_ids(dev);
122         pnp_free_resources(dev);
123         pnp_free_options(dev);
124         kfree(dev);
125 }
126
127 struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id,
128                               const char *pnpid)
129 {
130         struct pnp_dev *dev;
131         struct pnp_id *dev_id;
132
133         dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
134         if (!dev)
135                 return NULL;
136
137         INIT_LIST_HEAD(&dev->resources);
138         INIT_LIST_HEAD(&dev->options);
139         dev->protocol = protocol;
140         dev->number = id;
141         dev->dma_mask = DMA_BIT_MASK(24);
142
143         dev->dev.parent = &dev->protocol->dev;
144         dev->dev.bus = &pnp_bus_type;
145         dev->dev.dma_mask = &dev->dma_mask;
146         dev->dev.coherent_dma_mask = dev->dma_mask;
147         dev->dev.release = &pnp_release_device;
148
149         dev_set_name(&dev->dev, "%02x:%02x", dev->protocol->number, dev->number);
150
151         dev_id = pnp_add_id(dev, pnpid);
152         if (!dev_id) {
153                 kfree(dev);
154                 return NULL;
155         }
156
157         return dev;
158 }
159
160 int __pnp_add_device(struct pnp_dev *dev)
161 {
162         pnp_fixup_device(dev);
163         dev->status = PNP_READY;
164         spin_lock(&pnp_lock);
165         list_add_tail(&dev->global_list, &pnp_global);
166         list_add_tail(&dev->protocol_list, &dev->protocol->devices);
167         spin_unlock(&pnp_lock);
168         if (dev->protocol->can_wakeup)
169                 device_set_wakeup_capable(&dev->dev,
170                                 dev->protocol->can_wakeup(dev));
171         return device_register(&dev->dev);
172 }
173
174 /*
175  * pnp_add_device - adds a pnp device to the pnp layer
176  * @dev: pointer to dev to add
177  *
178  *  adds to driver model, name database, fixups, interface, etc.
179  */
180 int pnp_add_device(struct pnp_dev *dev)
181 {
182         int ret;
183         char buf[128];
184         int len = 0;
185         struct pnp_id *id;
186
187         if (dev->card)
188                 return -EINVAL;
189
190         ret = __pnp_add_device(dev);
191         if (ret)
192                 return ret;
193
194         buf[0] = '\0';
195         for (id = dev->id; id; id = id->next)
196                 len += scnprintf(buf + len, sizeof(buf) - len, " %s", id->id);
197
198         dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs%s (%s)\n",
199                    dev->protocol->name, buf,
200                    dev->active ? "active" : "disabled");
201         return 0;
202 }
203
204 void __pnp_remove_device(struct pnp_dev *dev)
205 {
206         spin_lock(&pnp_lock);
207         list_del(&dev->global_list);
208         list_del(&dev->protocol_list);
209         spin_unlock(&pnp_lock);
210         device_unregister(&dev->dev);
211 }
212
213 static int __init pnp_init(void)
214 {
215         return bus_register(&pnp_bus_type);
216 }
217
218 subsys_initcall(pnp_init);
219
220 int pnp_debug;
221
222 #if defined(CONFIG_PNP_DEBUG_MESSAGES)
223 module_param_named(debug, pnp_debug, int, 0644);
224 #endif