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 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/init.h> 14 #include <linux/string.h> 15 #include <linux/slab.h> 16 #include <linux/errno.h> 17 #include <linux/dma-mapping.h> 18 19 #include "base.h" 20 21 22 static LIST_HEAD(pnp_protocols); 23 LIST_HEAD(pnp_global); 24 DEFINE_SPINLOCK(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 void *pnp_alloc(long size) 35 { 36 void *result; 37 38 result = kmalloc(size, GFP_KERNEL); 39 if (!result){ 40 printk(KERN_ERR "pnp: Out of Memory\n"); 41 return NULL; 42 } 43 memset(result, 0, size); 44 return result; 45 } 46 47 /** 48 * pnp_protocol_register - adds a pnp protocol to the pnp layer 49 * @protocol: pointer to the corresponding pnp_protocol structure 50 * 51 * Ex protocols: ISAPNP, PNPBIOS, etc 52 */ 53 54 int pnp_register_protocol(struct pnp_protocol *protocol) 55 { 56 int nodenum; 57 struct list_head * pos; 58 59 if (!protocol) 60 return -EINVAL; 61 62 INIT_LIST_HEAD(&protocol->devices); 63 INIT_LIST_HEAD(&protocol->cards); 64 nodenum = 0; 65 spin_lock(&pnp_lock); 66 67 /* assign the lowest unused number */ 68 list_for_each(pos,&pnp_protocols) { 69 struct pnp_protocol * cur = to_pnp_protocol(pos); 70 if (cur->number == nodenum){ 71 pos = &pnp_protocols; 72 nodenum++; 73 } 74 } 75 76 list_add_tail(&protocol->protocol_list, &pnp_protocols); 77 spin_unlock(&pnp_lock); 78 79 protocol->number = nodenum; 80 sprintf(protocol->dev.bus_id, "pnp%d", nodenum); 81 return device_register(&protocol->dev); 82 } 83 84 /** 85 * pnp_protocol_unregister - removes a pnp protocol from the pnp layer 86 * @protocol: pointer to the corresponding pnp_protocol structure 87 * 88 */ 89 void pnp_unregister_protocol(struct pnp_protocol *protocol) 90 { 91 spin_lock(&pnp_lock); 92 list_del(&protocol->protocol_list); 93 spin_unlock(&pnp_lock); 94 device_unregister(&protocol->dev); 95 } 96 97 98 static void pnp_free_ids(struct pnp_dev *dev) 99 { 100 struct pnp_id * id; 101 struct pnp_id * next; 102 if (!dev) 103 return; 104 id = dev->id; 105 while (id) { 106 next = id->next; 107 kfree(id); 108 id = next; 109 } 110 } 111 112 static void pnp_release_device(struct device *dmdev) 113 { 114 struct pnp_dev * dev = to_pnp_dev(dmdev); 115 pnp_free_option(dev->independent); 116 pnp_free_option(dev->dependent); 117 pnp_free_ids(dev); 118 kfree(dev); 119 } 120 121 int __pnp_add_device(struct pnp_dev *dev) 122 { 123 int ret; 124 pnp_fixup_device(dev); 125 dev->dev.bus = &pnp_bus_type; 126 dev->dev.dma_mask = &dev->dma_mask; 127 dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK; 128 dev->dev.release = &pnp_release_device; 129 dev->status = PNP_READY; 130 spin_lock(&pnp_lock); 131 list_add_tail(&dev->global_list, &pnp_global); 132 list_add_tail(&dev->protocol_list, &dev->protocol->devices); 133 spin_unlock(&pnp_lock); 134 135 ret = device_register(&dev->dev); 136 if (ret == 0) 137 pnp_interface_attach_device(dev); 138 return ret; 139 } 140 141 /* 142 * pnp_add_device - adds a pnp device to the pnp layer 143 * @dev: pointer to dev to add 144 * 145 * adds to driver model, name database, fixups, interface, etc. 146 */ 147 148 int pnp_add_device(struct pnp_dev *dev) 149 { 150 if (!dev || !dev->protocol || dev->card) 151 return -EINVAL; 152 dev->dev.parent = &dev->protocol->dev; 153 sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number, dev->number); 154 return __pnp_add_device(dev); 155 } 156 157 void __pnp_remove_device(struct pnp_dev *dev) 158 { 159 spin_lock(&pnp_lock); 160 list_del(&dev->global_list); 161 list_del(&dev->protocol_list); 162 spin_unlock(&pnp_lock); 163 device_unregister(&dev->dev); 164 } 165 166 /** 167 * pnp_remove_device - removes a pnp device from the pnp layer 168 * @dev: pointer to dev to add 169 * 170 * this function will free all mem used by dev 171 */ 172 #if 0 173 void pnp_remove_device(struct pnp_dev *dev) 174 { 175 if (!dev || dev->card) 176 return; 177 __pnp_remove_device(dev); 178 } 179 #endif /* 0 */ 180 181 static int __init pnp_init(void) 182 { 183 printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n"); 184 return bus_register(&pnp_bus_type); 185 } 186 187 subsys_initcall(pnp_init); 188 189 #if 0 190 EXPORT_SYMBOL(pnp_register_protocol); 191 EXPORT_SYMBOL(pnp_unregister_protocol); 192 EXPORT_SYMBOL(pnp_add_device); 193 EXPORT_SYMBOL(pnp_remove_device); 194 #endif /* 0 */ 195