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 static void pnp_release_device(struct device *dmdev) 103 { 104 struct pnp_dev *dev = to_pnp_dev(dmdev); 105 106 pnp_free_option(dev->independent); 107 pnp_free_option(dev->dependent); 108 pnp_free_ids(dev); 109 kfree(dev); 110 } 111 112 int __pnp_add_device(struct pnp_dev *dev) 113 { 114 int ret; 115 116 pnp_fixup_device(dev); 117 dev->dev.bus = &pnp_bus_type; 118 dev->dev.dma_mask = &dev->dma_mask; 119 dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK; 120 dev->dev.release = &pnp_release_device; 121 dev->status = PNP_READY; 122 spin_lock(&pnp_lock); 123 list_add_tail(&dev->global_list, &pnp_global); 124 list_add_tail(&dev->protocol_list, &dev->protocol->devices); 125 spin_unlock(&pnp_lock); 126 127 ret = device_register(&dev->dev); 128 if (ret) 129 return ret; 130 131 pnp_interface_attach_device(dev); 132 return 0; 133 } 134 135 /* 136 * pnp_add_device - adds a pnp device to the pnp layer 137 * @dev: pointer to dev to add 138 * 139 * adds to driver model, name database, fixups, interface, etc. 140 */ 141 int pnp_add_device(struct pnp_dev *dev) 142 { 143 int ret; 144 145 if (dev->card) 146 return -EINVAL; 147 148 dev->dev.parent = &dev->protocol->dev; 149 sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number, 150 dev->number); 151 ret = __pnp_add_device(dev); 152 if (ret) 153 return ret; 154 155 #ifdef CONFIG_PNP_DEBUG 156 { 157 struct pnp_id *id; 158 159 dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs", 160 dev->protocol->name); 161 for (id = dev->id; id; id = id->next) 162 printk(" %s", id->id); 163 printk(" (%s)\n", dev->active ? "active" : "disabled"); 164 } 165 #endif 166 return 0; 167 } 168 169 void __pnp_remove_device(struct pnp_dev *dev) 170 { 171 spin_lock(&pnp_lock); 172 list_del(&dev->global_list); 173 list_del(&dev->protocol_list); 174 spin_unlock(&pnp_lock); 175 device_unregister(&dev->dev); 176 } 177 178 static int __init pnp_init(void) 179 { 180 printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n"); 181 return bus_register(&pnp_bus_type); 182 } 183 184 subsys_initcall(pnp_init); 185