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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 |