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
   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
  18 #include "base.h"
  19
  20
  21 static LIST_HEAD(pnp_protocols);
  22 LIST_HEAD(pnp_global);
  23 DEFINE_SPINLOCK(pnp_lock);
  24
  25 void *pnp_alloc(long size)
  26 {
  27         void *result;
  28
  29         result = kmalloc(size, GFP_KERNEL);
  30         if (!result){
  31                 printk(KERN_ERR "pnp: Out of Memory\n");
  32                 return NULL;
  33         }
  34         memset(result, 0, size);
  35         return result;
  36 }
  37
  38 /**
  39  * pnp_protocol_register - adds a pnp protocol to the pnp layer
  40  * @protocol: pointer to the corresponding pnp_protocol structure
  41  *
  42  *  Ex protocols: ISAPNP, PNPBIOS, etc
  43  */
  44
  45 int pnp_register_protocol(struct pnp_protocol *protocol)
  46 {
  47         int nodenum;
  48         struct list_head * pos;
  49
  50         if (!protocol)
  51                 return -EINVAL;
  52
  53         INIT_LIST_HEAD(&protocol->devices);
  54         INIT_LIST_HEAD(&protocol->cards);
  55         nodenum = 0;
  56         spin_lock(&pnp_lock);
  57
  58         /* assign the lowest unused number */
  59         list_for_each(pos,&pnp_protocols) {
  60                 struct pnp_protocol * cur = to_pnp_protocol(pos);
  61                 if (cur->number == nodenum){
  62                         pos = &pnp_protocols;
  63                         nodenum++;
  64                 }
  65         }
  66
  67         list_add_tail(&protocol->protocol_list, &pnp_protocols);
  68         spin_unlock(&pnp_lock);
  69
  70         protocol->number = nodenum;
  71         sprintf(protocol->dev.bus_id, "pnp%d", nodenum);
  72         return device_register(&protocol->dev);
  73 }
  74
  75 /**
  76  * pnp_protocol_unregister - removes a pnp protocol from the pnp layer
  77  * @protocol: pointer to the corresponding pnp_protocol structure
  78  *
  79  */
  80 void pnp_unregister_protocol(struct pnp_protocol *protocol)
  81 {
  82         spin_lock(&pnp_lock);
  83         list_del(&protocol->protocol_list);
  84         spin_unlock(&pnp_lock);
  85         device_unregister(&protocol->dev);
  86 }
  87
  88
  89 static void pnp_free_ids(struct pnp_dev *dev)
  90 {
  91         struct pnp_id * id;
  92         struct pnp_id * next;
  93         if (!dev)
  94                 return;
  95         id = dev->id;
  96         while (id) {
  97                 next = id->next;
  98                 kfree(id);
  99                 id = next;
 100         }
 101 }
 102
 103 static void pnp_release_device(struct device *dmdev)
 104 {
 105         struct pnp_dev * dev = to_pnp_dev(dmdev);
 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         pnp_fixup_device(dev);
 116         dev->dev.bus = &pnp_bus_type;
 117         dev->dev.release = &pnp_release_device;
 118         dev->status = PNP_READY;
 119         spin_lock(&pnp_lock);
 120         list_add_tail(&dev->global_list, &pnp_global);
 121         list_add_tail(&dev->protocol_list, &dev->protocol->devices);
 122         spin_unlock(&pnp_lock);
 123
 124         ret = device_register(&dev->dev);
 125         if (ret == 0)
 126                 pnp_interface_attach_device(dev);
 127         return ret;
 128 }
 129
 130 /*
 131  * pnp_add_device - adds a pnp device to the pnp layer
 132  * @dev: pointer to dev to add
 133  *
 134  *  adds to driver model, name database, fixups, interface, etc.
 135  */
 136
 137 int pnp_add_device(struct pnp_dev *dev)
 138 {
 139         if (!dev || !dev->protocol || dev->card)
 140                 return -EINVAL;
 141         dev->dev.parent = &dev->protocol->dev;
 142         sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number, dev->number);
 143         return __pnp_add_device(dev);
 144 }
 145
 146 void __pnp_remove_device(struct pnp_dev *dev)
 147 {
 148         spin_lock(&pnp_lock);
 149         list_del(&dev->global_list);
 150         list_del(&dev->protocol_list);
 151         spin_unlock(&pnp_lock);
 152         device_unregister(&dev->dev);
 153 }
 154
 155 /**
 156  * pnp_remove_device - removes a pnp device from the pnp layer
 157  * @dev: pointer to dev to add
 158  *
 159  * this function will free all mem used by dev
 160  */
 161
 162 void pnp_remove_device(struct pnp_dev *dev)
 163 {
 164         if (!dev || dev->card)
 165                 return;
 166         __pnp_remove_device(dev);
 167 }
 168
 169 static int __init pnp_init(void)
 170 {
 171         printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
 172         return bus_register(&pnp_bus_type);
 173 }
 174
 175 subsys_initcall(pnp_init);
 176
 177 EXPORT_SYMBOL(pnp_register_protocol);
 178 EXPORT_SYMBOL(pnp_unregister_protocol);
 179 EXPORT_SYMBOL(pnp_add_device);
 180 EXPORT_SYMBOL(pnp_remove_device);