tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
20static LIST_HEAD(pnp_protocols);
21LIST_HEAD(pnp_global);
22DEFINE_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 */
29int pnp_platform_devices;
30EXPORT_SYMBOL(pnp_platform_devices);
31
32void *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 */
50int 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 sprintf(protocol->dev.bus_id, "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 */
81void 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
89static 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
102static void pnp_release_device(struct device *dmdev)
103{
104 struct pnp_dev *dev = to_pnp_dev(dmdev);
105
106 pnp_free_option(dev->independent);
107 pnp_free_option(dev->dependent);
108 pnp_free_ids(dev);
109 kfree(dev->res);
110 kfree(dev);
111}
112
113struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id, char *pnpid)
114{
115 struct pnp_dev *dev;
116 struct pnp_id *dev_id;
117
118 dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
119 if (!dev)
120 return NULL;
121
122 dev->res = kzalloc(sizeof(struct pnp_resource_table), GFP_KERNEL);
123 if (!dev->res) {
124 kfree(dev);
125 return NULL;
126 }
127
128 dev->protocol = protocol;
129 dev->number = id;
130 dev->dma_mask = DMA_24BIT_MASK;
131
132 dev->dev.parent = &dev->protocol->dev;
133 dev->dev.bus = &pnp_bus_type;
134 dev->dev.dma_mask = &dev->dma_mask;
135 dev->dev.coherent_dma_mask = dev->dma_mask;
136 dev->dev.release = &pnp_release_device;
137
138 sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number,
139 dev->number);
140
141 dev_id = pnp_add_id(dev, pnpid);
142 if (!dev_id) {
143 kfree(dev->res);
144 kfree(dev);
145 return NULL;
146 }
147
148 return dev;
149}
150
151int __pnp_add_device(struct pnp_dev *dev)
152{
153 int ret;
154
155 pnp_fixup_device(dev);
156 dev->status = PNP_READY;
157 spin_lock(&pnp_lock);
158 list_add_tail(&dev->global_list, &pnp_global);
159 list_add_tail(&dev->protocol_list, &dev->protocol->devices);
160 spin_unlock(&pnp_lock);
161
162 ret = device_register(&dev->dev);
163 if (ret)
164 return ret;
165
166 pnp_interface_attach_device(dev);
167 return 0;
168}
169
170/*
171 * pnp_add_device - adds a pnp device to the pnp layer
172 * @dev: pointer to dev to add
173 *
174 * adds to driver model, name database, fixups, interface, etc.
175 */
176int pnp_add_device(struct pnp_dev *dev)
177{
178 int ret;
179
180 if (dev->card)
181 return -EINVAL;
182
183 ret = __pnp_add_device(dev);
184 if (ret)
185 return ret;
186
187#ifdef CONFIG_PNP_DEBUG
188 {
189 struct pnp_id *id;
190
191 dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs",
192 dev->protocol->name);
193 for (id = dev->id; id; id = id->next)
194 printk(" %s", id->id);
195 printk(" (%s)\n", dev->active ? "active" : "disabled");
196 }
197#endif
198 return 0;
199}
200
201void __pnp_remove_device(struct pnp_dev *dev)
202{
203 spin_lock(&pnp_lock);
204 list_del(&dev->global_list);
205 list_del(&dev->protocol_list);
206 spin_unlock(&pnp_lock);
207 device_unregister(&dev->dev);
208}
209
210static int __init pnp_init(void)
211{
212 printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
213 return bus_register(&pnp_bus_type);
214}
215
216subsys_initcall(pnp_init);