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1da177e4 LT |
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> | |
2e17c550 | 17 | #include <linux/dma-mapping.h> |
1da177e4 LT |
18 | |
19 | #include "base.h" | |
20 | ||
21 | ||
22 | static LIST_HEAD(pnp_protocols); | |
23 | LIST_HEAD(pnp_global); | |
24 | DEFINE_SPINLOCK(pnp_lock); | |
25 | ||
8f81dd14 BH |
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 | ||
1da177e4 LT |
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; | |
2e17c550 DB |
126 | dev->dev.dma_mask = &dev->dma_mask; |
127 | dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK; | |
1da177e4 LT |
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 | */ | |
b449f63c | 172 | #if 0 |
1da177e4 LT |
173 | void pnp_remove_device(struct pnp_dev *dev) |
174 | { | |
175 | if (!dev || dev->card) | |
176 | return; | |
177 | __pnp_remove_device(dev); | |
178 | } | |
b449f63c | 179 | #endif /* 0 */ |
1da177e4 LT |
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 | ||
b449f63c | 189 | #if 0 |
1da177e4 LT |
190 | EXPORT_SYMBOL(pnp_register_protocol); |
191 | EXPORT_SYMBOL(pnp_unregister_protocol); | |
192 | EXPORT_SYMBOL(pnp_add_device); | |
193 | EXPORT_SYMBOL(pnp_remove_device); | |
b449f63c | 194 | #endif /* 0 */ |