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 <ambx1@neo.rr.com>
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
22 static LIST_HEAD(pnp_protocols);
23 LIST_HEAD(pnp_global);
24 DEFINE_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 */
31 int pnp_platform_devices;
32 EXPORT_SYMBOL(pnp_platform_devices);
33
pnp_alloc(long size)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
pnp_remove_protocol(struct pnp_protocol * protocol)46 static void pnp_remove_protocol(struct pnp_protocol *protocol)
47 {
48 mutex_lock(&pnp_lock);
49 list_del(&protocol->protocol_list);
50 mutex_unlock(&pnp_lock);
51 }
52
53 /**
54 * pnp_protocol_register - adds a pnp protocol to the pnp layer
55 * @protocol: pointer to the corresponding pnp_protocol structure
56 *
57 * Ex protocols: ISAPNP, PNPBIOS, etc
58 */
pnp_register_protocol(struct pnp_protocol * protocol)59 int pnp_register_protocol(struct pnp_protocol *protocol)
60 {
61 struct list_head *pos;
62 int nodenum, ret;
63
64 INIT_LIST_HEAD(&protocol->devices);
65 INIT_LIST_HEAD(&protocol->cards);
66 nodenum = 0;
67
68 mutex_lock(&pnp_lock);
69
70 /* assign the lowest unused number */
71 list_for_each(pos, &pnp_protocols) {
72 struct pnp_protocol *cur = to_pnp_protocol(pos);
73 if (cur->number == nodenum) {
74 pos = &pnp_protocols;
75 nodenum++;
76 }
77 }
78
79 protocol->number = nodenum;
80 dev_set_name(&protocol->dev, "pnp%d", nodenum);
81
82 list_add_tail(&protocol->protocol_list, &pnp_protocols);
83
84 mutex_unlock(&pnp_lock);
85
86 ret = device_register(&protocol->dev);
87 if (ret)
88 pnp_remove_protocol(protocol);
89
90 return ret;
91 }
92
93 /**
94 * pnp_protocol_unregister - removes a pnp protocol from the pnp layer
95 * @protocol: pointer to the corresponding pnp_protocol structure
96 */
pnp_unregister_protocol(struct pnp_protocol * protocol)97 void pnp_unregister_protocol(struct pnp_protocol *protocol)
98 {
99 pnp_remove_protocol(protocol);
100 device_unregister(&protocol->dev);
101 }
102
pnp_free_ids(struct pnp_dev * dev)103 static void pnp_free_ids(struct pnp_dev *dev)
104 {
105 struct pnp_id *id;
106 struct pnp_id *next;
107
108 id = dev->id;
109 while (id) {
110 next = id->next;
111 kfree(id);
112 id = next;
113 }
114 }
115
pnp_free_resource(struct pnp_resource * pnp_res)116 void pnp_free_resource(struct pnp_resource *pnp_res)
117 {
118 list_del(&pnp_res->list);
119 kfree(pnp_res);
120 }
121
pnp_free_resources(struct pnp_dev * dev)122 void pnp_free_resources(struct pnp_dev *dev)
123 {
124 struct pnp_resource *pnp_res, *tmp;
125
126 list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
127 pnp_free_resource(pnp_res);
128 }
129 }
130
pnp_release_device(struct device * dmdev)131 static void pnp_release_device(struct device *dmdev)
132 {
133 struct pnp_dev *dev = to_pnp_dev(dmdev);
134
135 pnp_free_ids(dev);
136 pnp_free_resources(dev);
137 pnp_free_options(dev);
138 kfree(dev);
139 }
140
pnp_alloc_dev(struct pnp_protocol * protocol,int id,const char * pnpid)141 struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id,
142 const char *pnpid)
143 {
144 struct pnp_dev *dev;
145 struct pnp_id *dev_id;
146
147 dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
148 if (!dev)
149 return NULL;
150
151 INIT_LIST_HEAD(&dev->resources);
152 INIT_LIST_HEAD(&dev->options);
153 dev->protocol = protocol;
154 dev->number = id;
155 dev->dma_mask = DMA_BIT_MASK(24);
156
157 dev->dev.parent = &dev->protocol->dev;
158 dev->dev.bus = &pnp_bus_type;
159 dev->dev.dma_mask = &dev->dma_mask;
160 dev->dev.coherent_dma_mask = dev->dma_mask;
161 dev->dev.release = &pnp_release_device;
162
163 dev_set_name(&dev->dev, "%02x:%02x", dev->protocol->number, dev->number);
164
165 dev_id = pnp_add_id(dev, pnpid);
166 if (!dev_id) {
167 kfree(dev);
168 return NULL;
169 }
170
171 return dev;
172 }
173
pnp_delist_device(struct pnp_dev * dev)174 static void pnp_delist_device(struct pnp_dev *dev)
175 {
176 mutex_lock(&pnp_lock);
177 list_del(&dev->global_list);
178 list_del(&dev->protocol_list);
179 mutex_unlock(&pnp_lock);
180 }
181
__pnp_add_device(struct pnp_dev * dev)182 int __pnp_add_device(struct pnp_dev *dev)
183 {
184 int ret;
185
186 pnp_fixup_device(dev);
187 dev->status = PNP_READY;
188
189 mutex_lock(&pnp_lock);
190
191 list_add_tail(&dev->global_list, &pnp_global);
192 list_add_tail(&dev->protocol_list, &dev->protocol->devices);
193
194 mutex_unlock(&pnp_lock);
195
196 ret = device_register(&dev->dev);
197 if (ret)
198 pnp_delist_device(dev);
199 else if (dev->protocol->can_wakeup)
200 device_set_wakeup_capable(&dev->dev,
201 dev->protocol->can_wakeup(dev));
202
203 return ret;
204 }
205
206 /*
207 * pnp_add_device - adds a pnp device to the pnp layer
208 * @dev: pointer to dev to add
209 *
210 * adds to driver model, name database, fixups, interface, etc.
211 */
pnp_add_device(struct pnp_dev * dev)212 int pnp_add_device(struct pnp_dev *dev)
213 {
214 int ret;
215 char buf[128];
216 int len = 0;
217 struct pnp_id *id;
218
219 if (dev->card)
220 return -EINVAL;
221
222 ret = __pnp_add_device(dev);
223 if (ret)
224 return ret;
225
226 buf[0] = '\0';
227 for (id = dev->id; id; id = id->next)
228 len += scnprintf(buf + len, sizeof(buf) - len, " %s", id->id);
229
230 dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs%s (%s)\n",
231 dev->protocol->name, buf,
232 dev->active ? "active" : "disabled");
233 return 0;
234 }
235
__pnp_remove_device(struct pnp_dev * dev)236 void __pnp_remove_device(struct pnp_dev *dev)
237 {
238 pnp_delist_device(dev);
239 device_unregister(&dev->dev);
240 }
241
pnp_init(void)242 static int __init pnp_init(void)
243 {
244 return bus_register(&pnp_bus_type);
245 }
246
247 subsys_initcall(pnp_init);
248
249 int pnp_debug;
250
251 #if defined(CONFIG_PNP_DEBUG_MESSAGES)
252 module_param_named(debug, pnp_debug, int, 0644);
253 #endif
254