aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/pnp/core.c
blob: a411582bcd72d3caf7638fc1ede2a0747498af6e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
/*
 * core.c - contains all core device and protocol registration functions
 *
 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
 */

#include <linux/pnp.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/dma-mapping.h>

#include "base.h"

static LIST_HEAD(pnp_protocols);
LIST_HEAD(pnp_global);
DEFINE_SPINLOCK(pnp_lock);

/*
 * ACPI or PNPBIOS should tell us about all platform devices, so we can
 * skip some blind probes.  ISAPNP typically enumerates only plug-in ISA
 * devices, not built-in things like COM ports.
 */
int pnp_platform_devices;
EXPORT_SYMBOL(pnp_platform_devices);

void *pnp_alloc(long size)
{
	void *result;

	result = kzalloc(size, GFP_KERNEL);
	if (!result) {
		printk(KERN_ERR "pnp: Out of Memory\n");
		return NULL;
	}
	return result;
}

/**
 * pnp_protocol_register - adds a pnp protocol to the pnp layer
 * @protocol: pointer to the corresponding pnp_protocol structure
 *
 *  Ex protocols: ISAPNP, PNPBIOS, etc
 */
int pnp_register_protocol(struct pnp_protocol *protocol)
{
	int nodenum;
	struct list_head *pos;

	INIT_LIST_HEAD(&protocol->devices);
	INIT_LIST_HEAD(&protocol->cards);
	nodenum = 0;
	spin_lock(&pnp_lock);

	/* assign the lowest unused number */
	list_for_each(pos, &pnp_protocols) {
		struct pnp_protocol *cur = to_pnp_protocol(pos);
		if (cur->number == nodenum) {
			pos = &pnp_protocols;
			nodenum++;
		}
	}

	list_add_tail(&protocol->protocol_list, &pnp_protocols);
	spin_unlock(&pnp_lock);

	protocol->number = nodenum;
	sprintf(protocol->dev.bus_id, "pnp%d", nodenum);
	return device_register(&protocol->dev);
}

/**
 * pnp_protocol_unregister - removes a pnp protocol from the pnp layer
 * @protocol: pointer to the corresponding pnp_protocol structure
 */
void pnp_unregister_protocol(struct pnp_protocol *protocol)
{
	spin_lock(&pnp_lock);
	list_del(&protocol->protocol_list);
	spin_unlock(&pnp_lock);
	device_unregister(&protocol->dev);
}

static void pnp_free_ids(struct pnp_dev *dev)
{
	struct pnp_id *id;
	struct pnp_id *next;

	id = dev->id;
	while (id) {
		next = id->next;
		kfree(id);
		id = next;
	}
}

void pnp_free_resource(struct pnp_resource *pnp_res)
{
	list_del(&pnp_res->list);
	kfree(pnp_res);
}

void pnp_free_resources(struct pnp_dev *dev)
{
	struct pnp_resource *pnp_res, *tmp;

	list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
		pnp_free_resource(pnp_res);
	}
}

static void pnp_release_device(struct device *dmdev)
{
	struct pnp_dev *dev = to_pnp_dev(dmdev);

	pnp_free_ids(dev);
	pnp_free_resources(dev);
	pnp_free_options(dev);
	kfree(dev);
}

struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id, char *pnpid)
{
	struct pnp_dev *dev;
	struct pnp_id *dev_id;

	dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
	if (!dev)
		return NULL;

	INIT_LIST_HEAD(&dev->resources);
	INIT_LIST_HEAD(&dev->options);
	dev->protocol = protocol;
	dev->number = id;
	dev->dma_mask = DMA_24BIT_MASK;

	dev->dev.parent = &dev->protocol->dev;
	dev->dev.bus = &pnp_bus_type;
	dev->dev.dma_mask = &dev->dma_mask;
	dev->dev.coherent_dma_mask = dev->dma_mask;
	dev->dev.release = &pnp_release_device;

	sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number,
		dev->number);

	dev_id = pnp_add_id(dev, pnpid);
	if (!dev_id) {
		kfree(dev);
		return NULL;
	}

	return dev;
}

int __pnp_add_device(struct pnp_dev *dev)
{
	int ret;

	pnp_fixup_device(dev);
	dev->status = PNP_READY;
	spin_lock(&pnp_lock);
	list_add_tail(&dev->global_list, &pnp_global);
	list_add_tail(&dev->protocol_list, &dev->protocol->devices);
	spin_unlock(&pnp_lock);

	ret = device_register(&dev->dev);
	if (ret)
		return ret;

	pnp_interface_attach_device(dev);
	return 0;
}

/*
 * pnp_add_device - adds a pnp device to the pnp layer
 * @dev: pointer to dev to add
 *
 *  adds to driver model, name database, fixups, interface, etc.
 */
int pnp_add_device(struct pnp_dev *dev)
{
	int ret;

	if (dev->card)
		return -EINVAL;

	ret = __pnp_add_device(dev);
	if (ret)
		return ret;

#ifdef CONFIG_PNP_DEBUG
	{
		struct pnp_id *id;

		dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs",
			dev->protocol->name);
		for (id = dev->id; id; id = id->next)
			printk(" %s", id->id);
		printk(" (%s)\n", dev->active ? "active" : "disabled");
	}
#endif
	return 0;
}

void __pnp_remove_device(struct pnp_dev *dev)
{
	spin_lock(&pnp_lock);
	list_del(&dev->global_list);
	list_del(&dev->protocol_list);
	spin_unlock(&pnp_lock);
	device_unregister(&dev->dev);
}

static int __init pnp_init(void)
{
	printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
	return bus_register(&pnp_bus_type);
}

subsys_initcall(pnp_init);

Privacy Policy