xref: /openbmc/linux/drivers/pnp/core.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 
22 static LIST_HEAD(pnp_protocols);
23 LIST_HEAD(pnp_global);
24 DEFINE_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  */
31 int pnp_platform_devices;
32 EXPORT_SYMBOL(pnp_platform_devices);
33 
34 void *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 
54 int 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  */
89 void 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 
98 static 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 
112 static 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 
121 int __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 
148 int 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 
157 void __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 #if 0
173 void pnp_remove_device(struct pnp_dev *dev)
174 {
175 	if (!dev || dev->card)
176 		return;
177 	__pnp_remove_device(dev);
178 }
179 #endif  /*  0  */
180 
181 static int __init pnp_init(void)
182 {
183 	printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
184 	return bus_register(&pnp_bus_type);
185 }
186 
187 subsys_initcall(pnp_init);
188 
189 #if 0
190 EXPORT_SYMBOL(pnp_register_protocol);
191 EXPORT_SYMBOL(pnp_unregister_protocol);
192 EXPORT_SYMBOL(pnp_add_device);
193 EXPORT_SYMBOL(pnp_remove_device);
194 #endif  /*  0  */
195