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 #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  */