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