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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> | |
1da177e4 LT |
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> | |
2e17c550 | 16 | #include <linux/dma-mapping.h> |
1da177e4 LT |
17 | |
18 | #include "base.h" | |
19 | ||
1da177e4 LT |
20 | static LIST_HEAD(pnp_protocols); |
21 | LIST_HEAD(pnp_global); | |
22 | DEFINE_SPINLOCK(pnp_lock); | |
23 | ||
8f81dd14 BH |
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 | ||
1da177e4 LT |
32 | void *pnp_alloc(long size) |
33 | { | |
34 | void *result; | |
35 | ||
dd00cc48 | 36 | result = kzalloc(size, GFP_KERNEL); |
9dd78466 | 37 | if (!result) { |
1da177e4 LT |
38 | printk(KERN_ERR "pnp: Out of Memory\n"); |
39 | return NULL; | |
40 | } | |
1da177e4 LT |
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 | */ | |
1da177e4 LT |
50 | int pnp_register_protocol(struct pnp_protocol *protocol) |
51 | { | |
52 | int nodenum; | |
9dd78466 | 53 | struct list_head *pos; |
1da177e4 LT |
54 | |
55 | if (!protocol) | |
56 | return -EINVAL; | |
57 | ||
58 | INIT_LIST_HEAD(&protocol->devices); | |
59 | INIT_LIST_HEAD(&protocol->cards); | |
60 | nodenum = 0; | |
61 | spin_lock(&pnp_lock); | |
62 | ||
63 | /* assign the lowest unused number */ | |
9dd78466 BH |
64 | list_for_each(pos, &pnp_protocols) { |
65 | struct pnp_protocol *cur = to_pnp_protocol(pos); | |
66 | if (cur->number == nodenum) { | |
1da177e4 LT |
67 | pos = &pnp_protocols; |
68 | nodenum++; | |
69 | } | |
70 | } | |
71 | ||
72 | list_add_tail(&protocol->protocol_list, &pnp_protocols); | |
73 | spin_unlock(&pnp_lock); | |
74 | ||
75 | protocol->number = nodenum; | |
76 | sprintf(protocol->dev.bus_id, "pnp%d", nodenum); | |
77 | return device_register(&protocol->dev); | |
78 | } | |
79 | ||
80 | /** | |
81 | * pnp_protocol_unregister - removes a pnp protocol from the pnp layer | |
82 | * @protocol: pointer to the corresponding pnp_protocol structure | |
1da177e4 LT |
83 | */ |
84 | void pnp_unregister_protocol(struct pnp_protocol *protocol) | |
85 | { | |
86 | spin_lock(&pnp_lock); | |
87 | list_del(&protocol->protocol_list); | |
88 | spin_unlock(&pnp_lock); | |
89 | device_unregister(&protocol->dev); | |
90 | } | |
91 | ||
1da177e4 LT |
92 | static void pnp_free_ids(struct pnp_dev *dev) |
93 | { | |
9dd78466 BH |
94 | struct pnp_id *id; |
95 | struct pnp_id *next; | |
07d4e9af | 96 | |
1da177e4 LT |
97 | if (!dev) |
98 | return; | |
99 | id = dev->id; | |
100 | while (id) { | |
101 | next = id->next; | |
102 | kfree(id); | |
103 | id = next; | |
104 | } | |
105 | } | |
106 | ||
107 | static void pnp_release_device(struct device *dmdev) | |
108 | { | |
9dd78466 | 109 | struct pnp_dev *dev = to_pnp_dev(dmdev); |
07d4e9af | 110 | |
1da177e4 LT |
111 | pnp_free_option(dev->independent); |
112 | pnp_free_option(dev->dependent); | |
113 | pnp_free_ids(dev); | |
114 | kfree(dev); | |
115 | } | |
116 | ||
117 | int __pnp_add_device(struct pnp_dev *dev) | |
118 | { | |
119 | int ret; | |
07d4e9af | 120 | |
1da177e4 LT |
121 | pnp_fixup_device(dev); |
122 | dev->dev.bus = &pnp_bus_type; | |
2e17c550 DB |
123 | dev->dev.dma_mask = &dev->dma_mask; |
124 | dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK; | |
1da177e4 LT |
125 | dev->dev.release = &pnp_release_device; |
126 | dev->status = PNP_READY; | |
127 | spin_lock(&pnp_lock); | |
128 | list_add_tail(&dev->global_list, &pnp_global); | |
129 | list_add_tail(&dev->protocol_list, &dev->protocol->devices); | |
130 | spin_unlock(&pnp_lock); | |
131 | ||
132 | ret = device_register(&dev->dev); | |
133 | if (ret == 0) | |
134 | pnp_interface_attach_device(dev); | |
135 | return ret; | |
136 | } | |
137 | ||
138 | /* | |
139 | * pnp_add_device - adds a pnp device to the pnp layer | |
140 | * @dev: pointer to dev to add | |
141 | * | |
142 | * adds to driver model, name database, fixups, interface, etc. | |
143 | */ | |
1da177e4 LT |
144 | int pnp_add_device(struct pnp_dev *dev) |
145 | { | |
146 | if (!dev || !dev->protocol || dev->card) | |
147 | return -EINVAL; | |
148 | dev->dev.parent = &dev->protocol->dev; | |
9dd78466 BH |
149 | sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number, |
150 | dev->number); | |
1da177e4 LT |
151 | return __pnp_add_device(dev); |
152 | } | |
153 | ||
154 | void __pnp_remove_device(struct pnp_dev *dev) | |
155 | { | |
156 | spin_lock(&pnp_lock); | |
157 | list_del(&dev->global_list); | |
158 | list_del(&dev->protocol_list); | |
159 | spin_unlock(&pnp_lock); | |
160 | device_unregister(&dev->dev); | |
161 | } | |
162 | ||
1da177e4 LT |
163 | static int __init pnp_init(void) |
164 | { | |
165 | printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n"); | |
166 | return bus_register(&pnp_bus_type); | |
167 | } | |
168 | ||
169 | subsys_initcall(pnp_init); |