1 /* 2 * core.c - contains all core device and protocol registration functions 3 * 4 * Copyright 2002 Adam Belay <ambx1@neo.rr.com> 5 */ 6 7 #include <linux/pnp.h> 8 #include <linux/types.h> 9 #include <linux/list.h> 10 #include <linux/device.h> 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/string.h> 14 #include <linux/slab.h> 15 #include <linux/errno.h> 16 #include <linux/dma-mapping.h> 17 18 #include "base.h" 19 20 static LIST_HEAD(pnp_protocols); 21 LIST_HEAD(pnp_global); 22 DEFINE_SPINLOCK(pnp_lock); 23 24 /* 25 * ACPI or PNPBIOS should tell us about all platform devices, so we can 26 * skip some blind probes. ISAPNP typically enumerates only plug-in ISA 27 * devices, not built-in things like COM ports. 28 */ 29 int pnp_platform_devices; 30 EXPORT_SYMBOL(pnp_platform_devices); 31 32 void *pnp_alloc(long size) 33 { 34 void *result; 35 36 result = kzalloc(size, GFP_KERNEL); 37 if (!result) { 38 printk(KERN_ERR "pnp: Out of Memory\n"); 39 return NULL; 40 } 41 return result; 42 } 43 44 /** 45 * pnp_protocol_register - adds a pnp protocol to the pnp layer 46 * @protocol: pointer to the corresponding pnp_protocol structure 47 * 48 * Ex protocols: ISAPNP, PNPBIOS, etc 49 */ 50 int pnp_register_protocol(struct pnp_protocol *protocol) 51 { 52 int nodenum; 53 struct list_head *pos; 54 55 INIT_LIST_HEAD(&protocol->devices); 56 INIT_LIST_HEAD(&protocol->cards); 57 nodenum = 0; 58 spin_lock(&pnp_lock); 59 60 /* assign the lowest unused number */ 61 list_for_each(pos, &pnp_protocols) { 62 struct pnp_protocol *cur = to_pnp_protocol(pos); 63 if (cur->number == nodenum) { 64 pos = &pnp_protocols; 65 nodenum++; 66 } 67 } 68 69 list_add_tail(&protocol->protocol_list, &pnp_protocols); 70 spin_unlock(&pnp_lock); 71 72 protocol->number = nodenum; 73 sprintf(protocol->dev.bus_id, "pnp%d", nodenum); 74 return device_register(&protocol->dev); 75 } 76 77 /** 78 * pnp_protocol_unregister - removes a pnp protocol from the pnp layer 79 * @protocol: pointer to the corresponding pnp_protocol structure 80 */ 81 void pnp_unregister_protocol(struct pnp_protocol *protocol) 82 { 83 spin_lock(&pnp_lock); 84 list_del(&protocol->protocol_list); 85 spin_unlock(&pnp_lock); 86 device_unregister(&protocol->dev); 87 } 88 89 static void pnp_free_ids(struct pnp_dev *dev) 90 { 91 struct pnp_id *id; 92 struct pnp_id *next; 93 94 id = dev->id; 95 while (id) { 96 next = id->next; 97 kfree(id); 98 id = next; 99 } 100 } 101 102 void pnp_free_resource(struct pnp_resource *pnp_res) 103 { 104 list_del(&pnp_res->list); 105 kfree(pnp_res); 106 } 107 108 void pnp_free_resources(struct pnp_dev *dev) 109 { 110 struct pnp_resource *pnp_res, *tmp; 111 112 list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) { 113 pnp_free_resource(pnp_res); 114 } 115 } 116 117 static void pnp_release_device(struct device *dmdev) 118 { 119 struct pnp_dev *dev = to_pnp_dev(dmdev); 120 121 pnp_free_ids(dev); 122 pnp_free_resources(dev); 123 pnp_free_options(dev); 124 kfree(dev); 125 } 126 127 struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id, char *pnpid) 128 { 129 struct pnp_dev *dev; 130 struct pnp_id *dev_id; 131 132 dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL); 133 if (!dev) 134 return NULL; 135 136 INIT_LIST_HEAD(&dev->resources); 137 INIT_LIST_HEAD(&dev->options); 138 dev->protocol = protocol; 139 dev->number = id; 140 dev->dma_mask = DMA_24BIT_MASK; 141 142 dev->dev.parent = &dev->protocol->dev; 143 dev->dev.bus = &pnp_bus_type; 144 dev->dev.dma_mask = &dev->dma_mask; 145 dev->dev.coherent_dma_mask = dev->dma_mask; 146 dev->dev.release = &pnp_release_device; 147 148 sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number, 149 dev->number); 150 151 dev_id = pnp_add_id(dev, pnpid); 152 if (!dev_id) { 153 kfree(dev); 154 return NULL; 155 } 156 157 return dev; 158 } 159 160 int __pnp_add_device(struct pnp_dev *dev) 161 { 162 pnp_fixup_device(dev); 163 dev->status = PNP_READY; 164 spin_lock(&pnp_lock); 165 list_add_tail(&dev->global_list, &pnp_global); 166 list_add_tail(&dev->protocol_list, &dev->protocol->devices); 167 spin_unlock(&pnp_lock); 168 return device_register(&dev->dev); 169 } 170 171 /* 172 * pnp_add_device - adds a pnp device to the pnp layer 173 * @dev: pointer to dev to add 174 * 175 * adds to driver model, name database, fixups, interface, etc. 176 */ 177 int pnp_add_device(struct pnp_dev *dev) 178 { 179 int ret; 180 char buf[128]; 181 int len = 0; 182 struct pnp_id *id; 183 184 if (dev->card) 185 return -EINVAL; 186 187 ret = __pnp_add_device(dev); 188 if (ret) 189 return ret; 190 191 buf[0] = '\0'; 192 for (id = dev->id; id; id = id->next) 193 len += scnprintf(buf + len, sizeof(buf) - len, " %s", id->id); 194 195 pnp_dbg(&dev->dev, "%s device, IDs%s (%s)\n", 196 dev->protocol->name, buf, dev->active ? "active" : "disabled"); 197 return 0; 198 } 199 200 void __pnp_remove_device(struct pnp_dev *dev) 201 { 202 spin_lock(&pnp_lock); 203 list_del(&dev->global_list); 204 list_del(&dev->protocol_list); 205 spin_unlock(&pnp_lock); 206 device_unregister(&dev->dev); 207 } 208 209 static int __init pnp_init(void) 210 { 211 return bus_register(&pnp_bus_type); 212 } 213 214 subsys_initcall(pnp_init); 215 216 int pnp_debug; 217 218 #if defined(CONFIG_PNP_DEBUG_MESSAGES) 219 static int __init pnp_debug_setup(char *__unused) 220 { 221 pnp_debug = 1; 222 return 1; 223 } 224 __setup("pnp.debug", pnp_debug_setup); 225 #endif 226