1 // SPDX-License-Identifier: GPL-2.0
3 * core.c - contains all core device and protocol registration functions
5 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
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>
22 static LIST_HEAD(pnp_protocols);
23 LIST_HEAD(pnp_global);
24 DEFINE_MUTEX(pnp_lock);
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.
31 int pnp_platform_devices;
32 EXPORT_SYMBOL(pnp_platform_devices);
34 void *pnp_alloc(long size)
38 result = kzalloc(size, GFP_KERNEL);
40 printk(KERN_ERR "pnp: Out of Memory\n");
46 static void pnp_remove_protocol(struct pnp_protocol *protocol)
48 mutex_lock(&pnp_lock);
49 list_del(&protocol->protocol_list);
50 mutex_unlock(&pnp_lock);
54 * pnp_register_protocol - adds a pnp protocol to the pnp layer
55 * @protocol: pointer to the corresponding pnp_protocol structure
57 * Ex protocols: ISAPNP, PNPBIOS, etc
59 int pnp_register_protocol(struct pnp_protocol *protocol)
61 struct list_head *pos;
64 INIT_LIST_HEAD(&protocol->devices);
65 INIT_LIST_HEAD(&protocol->cards);
68 mutex_lock(&pnp_lock);
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) {
79 protocol->number = nodenum;
80 dev_set_name(&protocol->dev, "pnp%d", nodenum);
82 list_add_tail(&protocol->protocol_list, &pnp_protocols);
84 mutex_unlock(&pnp_lock);
86 ret = device_register(&protocol->dev);
88 pnp_remove_protocol(protocol);
94 * pnp_unregister_protocol - removes a pnp protocol from the pnp layer
95 * @protocol: pointer to the corresponding pnp_protocol structure
97 void pnp_unregister_protocol(struct pnp_protocol *protocol)
99 pnp_remove_protocol(protocol);
100 device_unregister(&protocol->dev);
103 static void pnp_free_ids(struct pnp_dev *dev)
116 void pnp_free_resource(struct pnp_resource *pnp_res)
118 list_del(&pnp_res->list);
122 void pnp_free_resources(struct pnp_dev *dev)
124 struct pnp_resource *pnp_res, *tmp;
126 list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
127 pnp_free_resource(pnp_res);
131 static void pnp_release_device(struct device *dmdev)
133 struct pnp_dev *dev = to_pnp_dev(dmdev);
136 pnp_free_resources(dev);
137 pnp_free_options(dev);
141 struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id,
145 struct pnp_id *dev_id;
147 dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
151 INIT_LIST_HEAD(&dev->resources);
152 INIT_LIST_HEAD(&dev->options);
153 dev->protocol = protocol;
155 dev->dma_mask = DMA_BIT_MASK(24);
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;
163 dev_set_name(&dev->dev, "%02x:%02x", dev->protocol->number, dev->number);
165 dev_id = pnp_add_id(dev, pnpid);
174 static void pnp_delist_device(struct pnp_dev *dev)
176 mutex_lock(&pnp_lock);
177 list_del(&dev->global_list);
178 list_del(&dev->protocol_list);
179 mutex_unlock(&pnp_lock);
182 int __pnp_add_device(struct pnp_dev *dev)
186 pnp_fixup_device(dev);
187 dev->status = PNP_READY;
189 mutex_lock(&pnp_lock);
191 list_add_tail(&dev->global_list, &pnp_global);
192 list_add_tail(&dev->protocol_list, &dev->protocol->devices);
194 mutex_unlock(&pnp_lock);
196 ret = device_register(&dev->dev);
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));
207 * pnp_add_device - adds a pnp device to the pnp layer
208 * @dev: pointer to dev to add
210 * adds to driver model, name database, fixups, interface, etc.
212 int pnp_add_device(struct pnp_dev *dev)
222 ret = __pnp_add_device(dev);
227 for (id = dev->id; id; id = id->next)
228 len += scnprintf(buf + len, sizeof(buf) - len, " %s", id->id);
230 dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs%s (%s)\n",
231 dev->protocol->name, buf,
232 dev->active ? "active" : "disabled");
236 void __pnp_remove_device(struct pnp_dev *dev)
238 pnp_delist_device(dev);
239 device_unregister(&dev->dev);
242 static int __init pnp_init(void)
244 return bus_register(&pnp_bus_type);
247 subsys_initcall(pnp_init);
251 #if defined(CONFIG_PNP_DEBUG_MESSAGES)
252 module_param_named(debug, pnp_debug, int, 0644);