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, char *pnpid)
128 {
129 struct pnp_dev *dev;
130 struct pnp_id *dev_id;
131
132 dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
133 if (!dev)
134 return NULL;
135
136 INIT_LIST_HEAD(&dev->resources);
137 INIT_LIST_HEAD(&dev->options);
138 dev->protocol = protocol;
139 dev->number = id;
140 dev->dma_mask = DMA_BIT_MASK(24);
141
142 dev->dev.parent = &dev->protocol->dev;
143 dev->dev.bus = &pnp_bus_type;
144 dev->dev.dma_mask = &dev->dma_mask;
145 dev->dev.coherent_dma_mask = dev->dma_mask;
146 dev->dev.release = &pnp_release_device;
147
148 dev_set_name(&dev->dev, "%02x:%02x", dev->protocol->number, dev->number);
149
150 dev_id = pnp_add_id(dev, pnpid);
151 if (!dev_id) {
152 kfree(dev);
153 return NULL;
154 }
155
156 return dev;
157 }
158
159 int __pnp_add_device(struct pnp_dev *dev)
160 {
161 pnp_fixup_device(dev);
162 dev->status = PNP_READY;
163 spin_lock(&pnp_lock);
164 list_add_tail(&dev->global_list, &pnp_global);
165 list_add_tail(&dev->protocol_list, &dev->protocol->devices);
166 spin_unlock(&pnp_lock);
167 return device_register(&dev->dev);
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 */
176 int pnp_add_device(struct pnp_dev *dev)
177 {
178 int ret;
179 char buf[128];
180 int len = 0;
181 struct pnp_id *id;
182
183 if (dev->card)
184 return -EINVAL;
185
186 ret = __pnp_add_device(dev);
187 if (ret)
188 return ret;
189
190 buf[0] = '\0';
191 for (id = dev->id; id; id = id->next)
192 len += scnprintf(buf + len, sizeof(buf) - len, " %s", id->id);
193
194 pnp_dbg(&dev->dev, "%s device, IDs%s (%s)\n",
195 dev->protocol->name, buf, dev->active ? "active" : "disabled");
196 return 0;
197 }
198
199 void __pnp_remove_device(struct pnp_dev *dev)
200 {
201 spin_lock(&pnp_lock);
202 list_del(&dev->global_list);
203 list_del(&dev->protocol_list);
204 spin_unlock(&pnp_lock);
205 device_unregister(&dev->dev);
206 }
207
208 static int __init pnp_init(void)
209 {
210 return bus_register(&pnp_bus_type);
211 }
212
213 subsys_initcall(pnp_init);
214
215 int pnp_debug;
216
217 #if defined(CONFIG_PNP_DEBUG_MESSAGES)
218 static int __init pnp_debug_setup(char *__unused)
219 {
220 pnp_debug = 1;
221 return 1;
222 }
223 __setup("pnp.debug", pnp_debug_setup);
224 #endif
225
|
This page was automatically generated by the
LXR engine.
|