some kmalloc/memset ->kzalloc (tree wide)
[linux-2.6.git] / drivers / pnp / core.c
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 = kzalloc(size, GFP_KERNEL);
39         if (!result){
40                 printk(KERN_ERR "pnp: Out of Memory\n");
41                 return NULL;
42         }
43         return result;
44 }
45
46 /**
47  * pnp_protocol_register - adds a pnp protocol to the pnp layer
48  * @protocol: pointer to the corresponding pnp_protocol structure
49  *
50  *  Ex protocols: ISAPNP, PNPBIOS, etc
51  */
52
53 int pnp_register_protocol(struct pnp_protocol *protocol)
54 {
55         int nodenum;
56         struct list_head * pos;
57
58         if (!protocol)
59                 return -EINVAL;
60
61         INIT_LIST_HEAD(&protocol->devices);
62         INIT_LIST_HEAD(&protocol->cards);
63         nodenum = 0;
64         spin_lock(&pnp_lock);
65
66         /* assign the lowest unused number */
67         list_for_each(pos,&pnp_protocols) {
68                 struct pnp_protocol * cur = to_pnp_protocol(pos);
69                 if (cur->number == nodenum){
70                         pos = &pnp_protocols;
71                         nodenum++;
72                 }
73         }
74
75         list_add_tail(&protocol->protocol_list, &pnp_protocols);
76         spin_unlock(&pnp_lock);
77
78         protocol->number = nodenum;
79         sprintf(protocol->dev.bus_id, "pnp%d", nodenum);
80         return device_register(&protocol->dev);
81 }
82
83 /**
84  * pnp_protocol_unregister - removes a pnp protocol from the pnp layer
85  * @protocol: pointer to the corresponding pnp_protocol structure
86  *
87  */
88 void pnp_unregister_protocol(struct pnp_protocol *protocol)
89 {
90         spin_lock(&pnp_lock);
91         list_del(&protocol->protocol_list);
92         spin_unlock(&pnp_lock);
93         device_unregister(&protocol->dev);
94 }
95
96
97 static void pnp_free_ids(struct pnp_dev *dev)
98 {
99         struct pnp_id * id;
100         struct pnp_id * next;
101         if (!dev)
102                 return;
103         id = dev->id;
104         while (id) {
105                 next = id->next;
106                 kfree(id);
107                 id = next;
108         }
109 }
110
111 static void pnp_release_device(struct device *dmdev)
112 {
113         struct pnp_dev * dev = to_pnp_dev(dmdev);
114         pnp_free_option(dev->independent);
115         pnp_free_option(dev->dependent);
116         pnp_free_ids(dev);
117         kfree(dev);
118 }
119
120 int __pnp_add_device(struct pnp_dev *dev)
121 {
122         int ret;
123         pnp_fixup_device(dev);
124         dev->dev.bus = &pnp_bus_type;
125         dev->dev.dma_mask = &dev->dma_mask;
126         dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK;
127         dev->dev.release = &pnp_release_device;
128         dev->status = PNP_READY;
129         spin_lock(&pnp_lock);
130         list_add_tail(&dev->global_list, &pnp_global);
131         list_add_tail(&dev->protocol_list, &dev->protocol->devices);
132         spin_unlock(&pnp_lock);
133
134         ret = device_register(&dev->dev);
135         if (ret == 0)
136                 pnp_interface_attach_device(dev);
137         return ret;
138 }
139
140 /*
141  * pnp_add_device - adds a pnp device to the pnp layer
142  * @dev: pointer to dev to add
143  *
144  *  adds to driver model, name database, fixups, interface, etc.
145  */
146
147 int pnp_add_device(struct pnp_dev *dev)
148 {
149         if (!dev || !dev->protocol || dev->card)
150                 return -EINVAL;
151         dev->dev.parent = &dev->protocol->dev;
152         sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number, dev->number);
153         return __pnp_add_device(dev);
154 }
155
156 void __pnp_remove_device(struct pnp_dev *dev)
157 {
158         spin_lock(&pnp_lock);
159         list_del(&dev->global_list);
160         list_del(&dev->protocol_list);
161         spin_unlock(&pnp_lock);
162         device_unregister(&dev->dev);
163 }
164
165 /**
166  * pnp_remove_device - removes a pnp device from the pnp layer
167  * @dev: pointer to dev to add
168  *
169  * this function will free all mem used by dev
170  */
171 #if 0
172 void pnp_remove_device(struct pnp_dev *dev)
173 {
174         if (!dev || dev->card)
175                 return;
176         __pnp_remove_device(dev);
177 }
178 #endif  /*  0  */
179
180 static int __init pnp_init(void)
181 {
182         printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
183         return bus_register(&pnp_bus_type);
184 }
185
186 subsys_initcall(pnp_init);
187
188 #if 0
189 EXPORT_SYMBOL(pnp_register_protocol);
190 EXPORT_SYMBOL(pnp_unregister_protocol);
191 EXPORT_SYMBOL(pnp_add_device);
192 EXPORT_SYMBOL(pnp_remove_device);
193 #endif  /*  0  */