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 static 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 94 void pnp_free_resource(struct pnp_resource *pnp_res) 95 { 96 list_del(&pnp_res->list); 97 kfree(pnp_res); 98 } 99 100 void 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 } 108 109 static 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 } 118 119 struct 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(sizeof(struct pnp_dev), GFP_KERNEL); 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 } 151 152 static 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 } 159 160 int __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 */ 190 int 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 } 212 213 static int __init pnp_init(void) 214 { 215 return bus_register(&pnp_bus_type); 216 } 217 218 subsys_initcall(pnp_init); 219 220 int pnp_debug; 221 222 #if defined(CONFIG_PNP_DEBUG_MESSAGES) 223 module_param_named(debug, pnp_debug, int, 0644); 224 #endif 225