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>
17#include <linux/dma-mapping.h>
18
19#include "base.h"
20
21
22static LIST_HEAD(pnp_protocols);
23LIST_HEAD(pnp_global);
24DEFINE_SPINLOCK(pnp_lock);
25
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 */
31int pnp_platform_devices;
32EXPORT_SYMBOL(pnp_platform_devices);
33
34void *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
54int 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 */
89void 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
98static 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
112static 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
121int __pnp_add_device(struct pnp_dev *dev)
122{
123	int ret;
124	pnp_fixup_device(dev);
125	dev->dev.bus = &pnp_bus_type;
126	dev->dev.dma_mask = &dev->dma_mask;
127	dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK;
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
148int 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
157void __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 */
172
173static int __init pnp_init(void)
174{
175	printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
176	return bus_register(&pnp_bus_type);
177}
178
179subsys_initcall(pnp_init);
180