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 if (!protocol) 56 return -EINVAL; 57 58 INIT_LIST_HEAD(&protocol->devices); 59 INIT_LIST_HEAD(&protocol->cards); 60 nodenum = 0; 61 spin_lock(&pnp_lock); 62 63 /* assign the lowest unused number */ 64 list_for_each(pos, &pnp_protocols) { 65 struct pnp_protocol *cur = to_pnp_protocol(pos); 66 if (cur->number == nodenum) { 67 pos = &pnp_protocols; 68 nodenum++; 69 } 70 } 71 72 list_add_tail(&protocol->protocol_list, &pnp_protocols); 73 spin_unlock(&pnp_lock); 74 75 protocol->number = nodenum; 76 sprintf(protocol->dev.bus_id, "pnp%d", nodenum); 77 return device_register(&protocol->dev); 78 } 79 80 /** 81 * pnp_protocol_unregister - removes a pnp protocol from the pnp layer 82 * @protocol: pointer to the corresponding pnp_protocol structure 83 */ 84 void pnp_unregister_protocol(struct pnp_protocol *protocol) 85 { 86 spin_lock(&pnp_lock); 87 list_del(&protocol->protocol_list); 88 spin_unlock(&pnp_lock); 89 device_unregister(&protocol->dev); 90 } 91 92 static void pnp_free_ids(struct pnp_dev *dev) 93 { 94 struct pnp_id *id; 95 struct pnp_id *next; 96 97 if (!dev) 98 return; 99 id = dev->id; 100 while (id) { 101 next = id->next; 102 kfree(id); 103 id = next; 104 } 105 } 106 107 static void pnp_release_device(struct device *dmdev) 108 { 109 struct pnp_dev *dev = to_pnp_dev(dmdev); 110 111 pnp_free_option(dev->independent); 112 pnp_free_option(dev->dependent); 113 pnp_free_ids(dev); 114 kfree(dev); 115 } 116 117 int __pnp_add_device(struct pnp_dev *dev) 118 { 119 int ret; 120 121 pnp_fixup_device(dev); 122 dev->dev.bus = &pnp_bus_type; 123 dev->dev.dma_mask = &dev->dma_mask; 124 dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK; 125 dev->dev.release = &pnp_release_device; 126 dev->status = PNP_READY; 127 spin_lock(&pnp_lock); 128 list_add_tail(&dev->global_list, &pnp_global); 129 list_add_tail(&dev->protocol_list, &dev->protocol->devices); 130 spin_unlock(&pnp_lock); 131 132 ret = device_register(&dev->dev); 133 if (ret == 0) 134 pnp_interface_attach_device(dev); 135 return ret; 136 } 137 138 /* 139 * pnp_add_device - adds a pnp device to the pnp layer 140 * @dev: pointer to dev to add 141 * 142 * adds to driver model, name database, fixups, interface, etc. 143 */ 144 int pnp_add_device(struct pnp_dev *dev) 145 { 146 if (!dev || !dev->protocol || dev->card) 147 return -EINVAL; 148 dev->dev.parent = &dev->protocol->dev; 149 sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number, 150 dev->number); 151 return __pnp_add_device(dev); 152 } 153 154 void __pnp_remove_device(struct pnp_dev *dev) 155 { 156 spin_lock(&pnp_lock); 157 list_del(&dev->global_list); 158 list_del(&dev->protocol_list); 159 spin_unlock(&pnp_lock); 160 device_unregister(&dev->dev); 161 } 162 163 static int __init pnp_init(void) 164 { 165 printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n"); 166 return bus_register(&pnp_bus_type); 167 } 168 169 subsys_initcall(pnp_init); 170