xref: /openbmc/linux/drivers/pnp/core.c (revision c21b37f6)
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 	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 */
64 	list_for_each(pos, &pnp_protocols) {
65 		struct pnp_protocol *cur = to_pnp_protocol(pos);
66 		if (cur->number == nodenum) {
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
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 
92 static void pnp_free_ids(struct pnp_dev *dev)
93 {
94 	struct pnp_id *id;
95 	struct pnp_id *next;
96 
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 {
109 	struct pnp_dev *dev = to_pnp_dev(dmdev);
110 
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;
120 
121 	pnp_fixup_device(dev);
122 	dev->dev.bus = &pnp_bus_type;
123 	dev->dev.dma_mask = &dev->dma_mask;
124 	dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK;
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  */
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;
149 	sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number,
150 		dev->number);
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 
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);
170