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 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 */
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 static 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);
110 }
111
112 int __pnp_add_device(struct pnp_dev *dev)
113 {
114 int ret;
115
116 pnp_fixup_device(dev);
117 dev->dev.bus = &pnp_bus_type;
118 dev->dev.dma_mask = &dev->dma_mask;
119 dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK;
120 dev->dev.release = &pnp_release_device;
121 dev->status = PNP_READY;
122 spin_lock(&pnp_lock);
123 list_add_tail(&dev->global_list, &pnp_global);
124 list_add_tail(&dev->protocol_list, &dev->protocol->devices);
125 spin_unlock(&pnp_lock);
126
127 ret = device_register(&dev->dev);
128 if (ret)
129 return ret;
130
131 pnp_interface_attach_device(dev);
132 return 0;
133 }
134
135 /*
136 * pnp_add_device - adds a pnp device to the pnp layer
137 * @dev: pointer to dev to add
138 *
139 * adds to driver model, name database, fixups, interface, etc.
140 */
141 int pnp_add_device(struct pnp_dev *dev)
142 {
143 int ret;
144
145 if (dev->card)
146 return -EINVAL;
147
148 dev->dev.parent = &dev->protocol->dev;
149 sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number,
150 dev->number);
151 ret = __pnp_add_device(dev);
152 if (ret)
153 return ret;
154
155 #ifdef CONFIG_PNP_DEBUG
156 {
157 struct pnp_id *id;
158
159 dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs",
160 dev->protocol->name);
161 for (id = dev->id; id; id = id->next)
162 printk(" %s", id->id);
163 printk(" (%s)\n", dev->active ? "active" : "disabled");
164 }
165 #endif
166 return 0;
167 }
168
169 void __pnp_remove_device(struct pnp_dev *dev)
170 {
171 spin_lock(&pnp_lock);
172 list_del(&dev->global_list);
173 list_del(&dev->protocol_list);
174 spin_unlock(&pnp_lock);
175 device_unregister(&dev->dev);
176 }
177
178 static int __init pnp_init(void)
179 {
180 printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
181 return bus_register(&pnp_bus_type);
182 }
183
184 subsys_initcall(pnp_init);
185
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