drivers/pnp/core.c

   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         int ret;
 163
 164         pnp_fixup_device(dev);
 165         dev->status = PNP_READY;
 166         spin_lock(&pnp_lock);
 167         list_add_tail(&dev->global_list, &pnp_global);
 168         list_add_tail(&dev->protocol_list, &dev->protocol->devices);
 169         spin_unlock(&pnp_lock);
 170
 171         ret = device_register(&dev->dev);
 172         if (ret)
 173                 return ret;
 174
 175         pnp_interface_attach_device(dev);
 176         return 0;
 177 }
 178
 179 /*
 180  * pnp_add_device - adds a pnp device to the pnp layer
 181  * @dev: pointer to dev to add
 182  *
 183  *  adds to driver model, name database, fixups, interface, etc.
 184  */
 185 int pnp_add_device(struct pnp_dev *dev)
 186 {
 187         int ret;
 188
 189         if (dev->card)
 190                 return -EINVAL;
 191
 192         ret = __pnp_add_device(dev);
 193         if (ret)
 194                 return ret;
 195
 196 #ifdef CONFIG_PNP_DEBUG
 197         {
 198                 struct pnp_id *id;
 199
 200                 dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs",
 201                         dev->protocol->name);
 202                 for (id = dev->id; id; id = id->next)
 203                         printk(" %s", id->id);
 204                 printk(" (%s)\n", dev->active ? "active" : "disabled");
 205         }
 206 #endif
 207         return 0;
 208 }
 209
 210 void __pnp_remove_device(struct pnp_dev *dev)
 211 {
 212         spin_lock(&pnp_lock);
 213         list_del(&dev->global_list);
 214         list_del(&dev->protocol_list);
 215         spin_unlock(&pnp_lock);
 216         device_unregister(&dev->dev);
 217 }
 218
 219 static int __init pnp_init(void)
 220 {
 221         printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
 222         return bus_register(&pnp_bus_type);
 223 }
 224
 225 subsys_initcall(pnp_init);