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 34 static 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 */ 47 int 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 81 /** 82 * pnp_unregister_protocol - removes a pnp protocol from the pnp layer 83 * @protocol: pointer to the corresponding pnp_protocol structure 84 */ 85 void pnp_unregister_protocol(struct pnp_protocol *protocol) 86 { 87 pnp_remove_protocol(protocol); 88 device_unregister(&protocol->dev); 89 } 90 91 static void pnp_free_ids(struct pnp_dev *dev) 92 { 93 struct pnp_id *id; 94 struct pnp_id *next; 95 96 id = dev->id; 97 while (id) { 98 next = id->next; 99 kfree(id); 100 id = next; 101 } 102 } 103 104 void pnp_free_resource(struct pnp_resource *pnp_res) 105 { 106 list_del(&pnp_res->list); 107 kfree(pnp_res); 108 } 109 110 void pnp_free_resources(struct pnp_dev *dev) 111 { 112 struct pnp_resource *pnp_res, *tmp; 113 114 list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) { 115 pnp_free_resource(pnp_res); 116 } 117 } 118 119 static void pnp_release_device(struct device *dmdev) 120 { 121 struct pnp_dev *dev = to_pnp_dev(dmdev); 122 123 pnp_free_ids(dev); 124 pnp_free_resources(dev); 125 pnp_free_options(dev); 126 kfree(dev); 127 } 128 129 struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id, 130 const char *pnpid) 131 { 132 struct pnp_dev *dev; 133 struct pnp_id *dev_id; 134 135 dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL); 136 if (!dev) 137 return NULL; 138 139 INIT_LIST_HEAD(&dev->resources); 140 INIT_LIST_HEAD(&dev->options); 141 dev->protocol = protocol; 142 dev->number = id; 143 dev->dma_mask = DMA_BIT_MASK(24); 144 145 dev->dev.parent = &dev->protocol->dev; 146 dev->dev.bus = &pnp_bus_type; 147 dev->dev.dma_mask = &dev->dma_mask; 148 dev->dev.coherent_dma_mask = dev->dma_mask; 149 dev->dev.release = &pnp_release_device; 150 151 dev_set_name(&dev->dev, "%02x:%02x", dev->protocol->number, dev->number); 152 153 dev_id = pnp_add_id(dev, pnpid); 154 if (!dev_id) { 155 kfree(dev); 156 return NULL; 157 } 158 159 return dev; 160 } 161 162 static void pnp_delist_device(struct pnp_dev *dev) 163 { 164 mutex_lock(&pnp_lock); 165 list_del(&dev->global_list); 166 list_del(&dev->protocol_list); 167 mutex_unlock(&pnp_lock); 168 } 169 170 int __pnp_add_device(struct pnp_dev *dev) 171 { 172 int ret; 173 174 pnp_fixup_device(dev); 175 dev->status = PNP_READY; 176 177 mutex_lock(&pnp_lock); 178 179 list_add_tail(&dev->global_list, &pnp_global); 180 list_add_tail(&dev->protocol_list, &dev->protocol->devices); 181 182 mutex_unlock(&pnp_lock); 183 184 ret = device_register(&dev->dev); 185 if (ret) 186 pnp_delist_device(dev); 187 else if (dev->protocol->can_wakeup) 188 device_set_wakeup_capable(&dev->dev, 189 dev->protocol->can_wakeup(dev)); 190 191 return ret; 192 } 193 194 /* 195 * pnp_add_device - adds a pnp device to the pnp layer 196 * @dev: pointer to dev to add 197 * 198 * adds to driver model, name database, fixups, interface, etc. 199 */ 200 int pnp_add_device(struct pnp_dev *dev) 201 { 202 int ret; 203 char buf[128]; 204 int len = 0; 205 struct pnp_id *id; 206 207 if (dev->card) 208 return -EINVAL; 209 210 ret = __pnp_add_device(dev); 211 if (ret) 212 return ret; 213 214 buf[0] = '\0'; 215 for (id = dev->id; id; id = id->next) 216 len += scnprintf(buf + len, sizeof(buf) - len, " %s", id->id); 217 218 dev_dbg(&dev->dev, "%s device, IDs%s (%s)\n", dev->protocol->name, buf, 219 dev->active ? "active" : "disabled"); 220 return 0; 221 } 222 223 void __pnp_remove_device(struct pnp_dev *dev) 224 { 225 pnp_delist_device(dev); 226 device_unregister(&dev->dev); 227 } 228 229 static int __init pnp_init(void) 230 { 231 return bus_register(&pnp_bus_type); 232 } 233 234 subsys_initcall(pnp_init); 235 236 int pnp_debug; 237 238 #if defined(CONFIG_PNP_DEBUG_MESSAGES) 239 module_param_named(debug, pnp_debug, int, 0644); 240 #endif 241