blob: 7d366ca672d34ea7b6d07afa04fbcfbec849ad10 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * core.c - contains all core device and protocol registration functions
3 *
4 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 */
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>
David Brownell2e17c552007-05-08 00:25:29 -070016#include <linux/dma-mapping.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18#include "base.h"
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020static LIST_HEAD(pnp_protocols);
21LIST_HEAD(pnp_global);
22DEFINE_SPINLOCK(pnp_lock);
23
Bjorn Helgaas8f81dd12007-05-08 00:35:54 -070024/*
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 */
29int pnp_platform_devices;
30EXPORT_SYMBOL(pnp_platform_devices);
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032void *pnp_alloc(long size)
33{
34 void *result;
35
Yoann Padioleaudd00cc42007-07-19 01:49:03 -070036 result = kzalloc(size, GFP_KERNEL);
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070037 if (!result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 printk(KERN_ERR "pnp: Out of Memory\n");
39 return NULL;
40 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070050int pnp_register_protocol(struct pnp_protocol *protocol)
51{
52 int nodenum;
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070053 struct list_head *pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 INIT_LIST_HEAD(&protocol->devices);
56 INIT_LIST_HEAD(&protocol->cards);
57 nodenum = 0;
58 spin_lock(&pnp_lock);
59
60 /* assign the lowest unused number */
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070061 list_for_each(pos, &pnp_protocols) {
62 struct pnp_protocol *cur = to_pnp_protocol(pos);
63 if (cur->number == nodenum) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 pos = &pnp_protocols;
65 nodenum++;
66 }
67 }
68
69 list_add_tail(&protocol->protocol_list, &pnp_protocols);
70 spin_unlock(&pnp_lock);
71
72 protocol->number = nodenum;
73 sprintf(protocol->dev.bus_id, "pnp%d", nodenum);
74 return device_register(&protocol->dev);
75}
76
77/**
78 * pnp_protocol_unregister - removes a pnp protocol from the pnp layer
79 * @protocol: pointer to the corresponding pnp_protocol structure
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 */
81void pnp_unregister_protocol(struct pnp_protocol *protocol)
82{
83 spin_lock(&pnp_lock);
84 list_del(&protocol->protocol_list);
85 spin_unlock(&pnp_lock);
86 device_unregister(&protocol->dev);
87}
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089static void pnp_free_ids(struct pnp_dev *dev)
90{
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070091 struct pnp_id *id;
92 struct pnp_id *next;
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -070093
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 id = dev->id;
95 while (id) {
96 next = id->next;
97 kfree(id);
98 id = next;
99 }
100}
101
102static void pnp_release_device(struct device *dmdev)
103{
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700104 struct pnp_dev *dev = to_pnp_dev(dmdev);
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -0700105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 pnp_free_option(dev->independent);
107 pnp_free_option(dev->dependent);
108 pnp_free_ids(dev);
109 kfree(dev);
110}
111
112int __pnp_add_device(struct pnp_dev *dev)
113{
114 int ret;
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -0700115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 pnp_fixup_device(dev);
117 dev->dev.bus = &pnp_bus_type;
David Brownell2e17c552007-05-08 00:25:29 -0700118 dev->dev.dma_mask = &dev->dma_mask;
119 dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 dev->dev.release = &pnp_release_device;
121 dev->status = PNP_READY;
122 spin_lock(&pnp_lock);
123 list_add_tail(&dev->global_list, &pnp_global);
124 list_add_tail(&dev->protocol_list, &dev->protocol->devices);
125 spin_unlock(&pnp_lock);
126
127 ret = device_register(&dev->dev);
Bjorn Helgaas348366b2007-10-16 23:31:12 -0700128 if (ret)
129 return ret;
130
131 pnp_interface_attach_device(dev);
132 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133}
134
135/*
136 * pnp_add_device - adds a pnp device to the pnp layer
137 * @dev: pointer to dev to add
138 *
139 * adds to driver model, name database, fixups, interface, etc.
140 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141int pnp_add_device(struct pnp_dev *dev)
142{
Bjorn Helgaas348366b2007-10-16 23:31:12 -0700143 int ret;
144
Bjorn Helgaasb1734912007-08-15 10:32:13 -0600145 if (dev->card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 return -EINVAL;
Bjorn Helgaas348366b2007-10-16 23:31:12 -0700147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 dev->dev.parent = &dev->protocol->dev;
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700149 sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number,
150 dev->number);
Bjorn Helgaas348366b2007-10-16 23:31:12 -0700151 ret = __pnp_add_device(dev);
152 if (ret)
153 return ret;
154
155#ifdef CONFIG_PNP_DEBUG
156 {
157 struct pnp_id *id;
158
159 dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs",
160 dev->protocol->name);
161 for (id = dev->id; id; id = id->next)
162 printk(" %s", id->id);
163 printk(" (%s)\n", dev->active ? "active" : "disabled");
164 }
165#endif
166 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
168
169void __pnp_remove_device(struct pnp_dev *dev)
170{
171 spin_lock(&pnp_lock);
172 list_del(&dev->global_list);
173 list_del(&dev->protocol_list);
174 spin_unlock(&pnp_lock);
175 device_unregister(&dev->dev);
176}
177
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178static int __init pnp_init(void)
179{
180 printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
181 return bus_register(&pnp_bus_type);
182}
183
184subsys_initcall(pnp_init);