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| 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 | dev_set_name(&protocol->dev, "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, |
| 128 | const char *pnpid) |
| 129 | { |
| 130 | struct pnp_dev *dev; |
| 131 | struct pnp_id *dev_id; |
| 132 | |
| 133 | dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL); |
| 134 | if (!dev) |
| 135 | return NULL; |
| 136 | |
| 137 | INIT_LIST_HEAD(&dev->resources); |
| 138 | INIT_LIST_HEAD(&dev->options); |
| 139 | dev->protocol = protocol; |
| 140 | dev->number = id; |
| 141 | dev->dma_mask = DMA_BIT_MASK(24); |
| 142 | |
| 143 | dev->dev.parent = &dev->protocol->dev; |
| 144 | dev->dev.bus = &pnp_bus_type; |
| 145 | dev->dev.dma_mask = &dev->dma_mask; |
| 146 | dev->dev.coherent_dma_mask = dev->dma_mask; |
| 147 | dev->dev.release = &pnp_release_device; |
| 148 | |
| 149 | dev_set_name(&dev->dev, "%02x:%02x", dev->protocol->number, 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 | if (dev->protocol->can_wakeup) |
| 169 | device_set_wakeup_capable(&dev->dev, |
| 170 | dev->protocol->can_wakeup(dev)); |
| 171 | return device_register(&dev->dev); |
| 172 | } |
| 173 | |
| 174 | /* |
| 175 | * pnp_add_device - adds a pnp device to the pnp layer |
| 176 | * @dev: pointer to dev to add |
| 177 | * |
| 178 | * adds to driver model, name database, fixups, interface, etc. |
| 179 | */ |
| 180 | int pnp_add_device(struct pnp_dev *dev) |
| 181 | { |
| 182 | int ret; |
| 183 | char buf[128]; |
| 184 | int len = 0; |
| 185 | struct pnp_id *id; |
| 186 | |
| 187 | if (dev->card) |
| 188 | return -EINVAL; |
| 189 | |
| 190 | ret = __pnp_add_device(dev); |
| 191 | if (ret) |
| 192 | return ret; |
| 193 | |
| 194 | buf[0] = '\0'; |
| 195 | for (id = dev->id; id; id = id->next) |
| 196 | len += scnprintf(buf + len, sizeof(buf) - len, " %s", id->id); |
| 197 | |
| 198 | dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs%s (%s)\n", |
| 199 | dev->protocol->name, buf, |
| 200 | dev->active ? "active" : "disabled"); |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | void __pnp_remove_device(struct pnp_dev *dev) |
| 205 | { |
| 206 | spin_lock(&pnp_lock); |
| 207 | list_del(&dev->global_list); |
| 208 | list_del(&dev->protocol_list); |
| 209 | spin_unlock(&pnp_lock); |
| 210 | device_unregister(&dev->dev); |
| 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 |
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Tags:
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