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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * core.c - contains all core device and protocol registration functions
4 *
5 * Copyright 2002 Adam Belay <[email protected]>
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/mutex.h>
14#include <linux/init.h>
15#include <linux/string.h>
16#include <linux/slab.h>
17#include <linux/errno.h>
18#include <linux/dma-mapping.h>
19
20#include "base.h"
21
22static LIST_HEAD(pnp_protocols);
23LIST_HEAD(pnp_global);
24DEFINE_MUTEX(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 */
31int pnp_platform_devices;
32EXPORT_SYMBOL(pnp_platform_devices);
33
34static void pnp_remove_protocol(struct pnp_protocol *protocol)
35{
36 mutex_lock(&pnp_lock);
37 list_del(&protocol->protocol_list);
38 mutex_unlock(&pnp_lock);
39}
40
41/**
42 * pnp_register_protocol - adds a pnp protocol to the pnp layer
43 * @protocol: pointer to the corresponding pnp_protocol structure
44 *
45 * Ex protocols: ISAPNP, PNPBIOS, etc
46 */
47int pnp_register_protocol(struct pnp_protocol *protocol)
48{
49 struct list_head *pos;
50 int nodenum, ret;
51
52 INIT_LIST_HEAD(&protocol->devices);
53 INIT_LIST_HEAD(&protocol->cards);
54 nodenum = 0;
55
56 mutex_lock(&pnp_lock);
57
58 /* assign the lowest unused number */
59 list_for_each(pos, &pnp_protocols) {
60 struct pnp_protocol *cur = to_pnp_protocol(pos);
61 if (cur->number == nodenum) {
62 pos = &pnp_protocols;
63 nodenum++;
64 }
65 }
66
67 protocol->number = nodenum;
68 dev_set_name(&protocol->dev, "pnp%d", nodenum);
69
70 list_add_tail(&protocol->protocol_list, &pnp_protocols);
71
72 mutex_unlock(&pnp_lock);
73
74 ret = device_register(&protocol->dev);
75 if (ret)
76 pnp_remove_protocol(protocol);
77
78 return ret;
79}
80
81static void pnp_free_ids(struct pnp_dev *dev)
82{
83 struct pnp_id *id;
84 struct pnp_id *next;
85
86 id = dev->id;
87 while (id) {
88 next = id->next;
89 kfree(id);
90 id = next;
91 }
92}
93
94void pnp_free_resource(struct pnp_resource *pnp_res)
95{
96 list_del(&pnp_res->list);
97 kfree(pnp_res);
98}
99
100void pnp_free_resources(struct pnp_dev *dev)
101{
102 struct pnp_resource *pnp_res, *tmp;
103
104 list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
105 pnp_free_resource(pnp_res);
106 }
107}
108
109static void pnp_release_device(struct device *dmdev)
110{
111 struct pnp_dev *dev = to_pnp_dev(dmdev);
112
113 pnp_free_ids(dev);
114 pnp_free_resources(dev);
115 pnp_free_options(dev);
116 kfree(dev);
117}
118
119struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id,
120 const char *pnpid)
121{
122 struct pnp_dev *dev;
123 struct pnp_id *dev_id;
124
125 dev = kzalloc_obj(struct pnp_dev);
126 if (!dev)
127 return NULL;
128
129 INIT_LIST_HEAD(&dev->resources);
130 INIT_LIST_HEAD(&dev->options);
131 dev->protocol = protocol;
132 dev->number = id;
133 dev->dma_mask = DMA_BIT_MASK(24);
134
135 dev->dev.parent = &dev->protocol->dev;
136 dev->dev.bus = &pnp_bus_type;
137 dev->dev.dma_mask = &dev->dma_mask;
138 dev->dev.coherent_dma_mask = dev->dma_mask;
139 dev->dev.release = &pnp_release_device;
140
141 dev_id = pnp_add_id(dev, pnpid);
142 if (!dev_id) {
143 kfree(dev);
144 return NULL;
145 }
146
147 dev_set_name(&dev->dev, "%02x:%02x", dev->protocol->number, dev->number);
148
149 return dev;
150}
151
152static void pnp_delist_device(struct pnp_dev *dev)
153{
154 mutex_lock(&pnp_lock);
155 list_del(&dev->global_list);
156 list_del(&dev->protocol_list);
157 mutex_unlock(&pnp_lock);
158}
159
160int __pnp_add_device(struct pnp_dev *dev)
161{
162 int ret;
163
164 pnp_fixup_device(dev);
165 dev->status = PNP_READY;
166
167 mutex_lock(&pnp_lock);
168
169 list_add_tail(&dev->global_list, &pnp_global);
170 list_add_tail(&dev->protocol_list, &dev->protocol->devices);
171
172 mutex_unlock(&pnp_lock);
173
174 ret = device_register(&dev->dev);
175 if (ret)
176 pnp_delist_device(dev);
177 else if (dev->protocol->can_wakeup)
178 device_set_wakeup_capable(&dev->dev,
179 dev->protocol->can_wakeup(dev));
180
181 return ret;
182}
183
184/*
185 * pnp_add_device - adds a pnp device to the pnp layer
186 * @dev: pointer to dev to add
187 *
188 * adds to driver model, name database, fixups, interface, etc.
189 */
190int pnp_add_device(struct pnp_dev *dev)
191{
192 int ret;
193 char buf[128];
194 int len = 0;
195 struct pnp_id *id;
196
197 if (dev->card)
198 return -EINVAL;
199
200 ret = __pnp_add_device(dev);
201 if (ret)
202 return ret;
203
204 buf[0] = '\0';
205 for (id = dev->id; id; id = id->next)
206 len += scnprintf(buf + len, sizeof(buf) - len, " %s", id->id);
207
208 dev_dbg(&dev->dev, "%s device, IDs%s (%s)\n", dev->protocol->name, buf,
209 dev->active ? "active" : "disabled");
210 return 0;
211}
212
213static int __init pnp_init(void)
214{
215 return bus_register(&pnp_bus_type);
216}
217
218subsys_initcall(pnp_init);
219
220int pnp_debug;
221
222#if defined(CONFIG_PNP_DEBUG_MESSAGES)
223module_param_named(debug, pnp_debug, int, 0644);
224#endif