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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
   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 void *pnp_alloc(long size)
  27 {
  28         void *result;
  29
  30         result = kmalloc(size, GFP_KERNEL);
  31         if (!result){
  32                 printk(KERN_ERR "pnp: Out of Memory\n");
  33                 return NULL;
  34         }
  35         memset(result, 0, size);
  36         return result;
  37 }
  38
  39 /**
  40  * pnp_protocol_register - adds a pnp protocol to the pnp layer
  41  * @protocol: pointer to the corresponding pnp_protocol structure
  42  *
  43  *  Ex protocols: ISAPNP, PNPBIOS, etc
  44  */
  45
  46 int pnp_register_protocol(struct pnp_protocol *protocol)
  47 {
  48         int nodenum;
  49         struct list_head * pos;
  50
  51         if (!protocol)
  52                 return -EINVAL;
  53
  54         INIT_LIST_HEAD(&protocol->devices);
  55         INIT_LIST_HEAD(&protocol->cards);
  56         nodenum = 0;
  57         spin_lock(&pnp_lock);
  58
  59         /* assign the lowest unused number */
  60         list_for_each(pos,&pnp_protocols) {
  61                 struct pnp_protocol * cur = to_pnp_protocol(pos);
  62                 if (cur->number == nodenum){
  63                         pos = &pnp_protocols;
  64                         nodenum++;
  65                 }
  66         }
  67
  68         list_add_tail(&protocol->protocol_list, &pnp_protocols);
  69         spin_unlock(&pnp_lock);
  70
  71         protocol->number = nodenum;
  72         sprintf(protocol->dev.bus_id, "pnp%d", nodenum);
  73         return device_register(&protocol->dev);
  74 }
  75
  76 /**
  77  * pnp_protocol_unregister - removes a pnp protocol from the pnp layer
  78  * @protocol: pointer to the corresponding pnp_protocol structure
  79  *
  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
  90 static void pnp_free_ids(struct pnp_dev *dev)
  91 {
  92         struct pnp_id * id;
  93         struct pnp_id * next;
  94         if (!dev)
  95                 return;
  96         id = dev->id;
  97         while (id) {
  98                 next = id->next;
  99                 kfree(id);
 100                 id = next;
 101         }
 102 }
 103
 104 static void pnp_release_device(struct device *dmdev)
 105 {
 106         struct pnp_dev * dev = to_pnp_dev(dmdev);
 107         pnp_free_option(dev->independent);
 108         pnp_free_option(dev->dependent);
 109         pnp_free_ids(dev);
 110         kfree(dev);
 111 }
 112
 113 int __pnp_add_device(struct pnp_dev *dev)
 114 {
 115         int ret;
 116         pnp_fixup_device(dev);
 117         dev->dev.bus = &pnp_bus_type;
 118         dev->dev.dma_mask = &dev->dma_mask;
 119         dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK;
 120         dev->dev.release = &pnp_release_device;
 121         dev->status = PNP_READY;
 122         spin_lock(&pnp_lock);
 123         list_add_tail(&dev->global_list, &pnp_global);
 124         list_add_tail(&dev->protocol_list, &dev->protocol->devices);
 125         spin_unlock(&pnp_lock);
 126
 127         ret = device_register(&dev->dev);
 128         if (ret == 0)
 129                 pnp_interface_attach_device(dev);
 130         return ret;
 131 }
 132
 133 /*
 134  * pnp_add_device - adds a pnp device to the pnp layer
 135  * @dev: pointer to dev to add
 136  *
 137  *  adds to driver model, name database, fixups, interface, etc.
 138  */
 139
 140 int pnp_add_device(struct pnp_dev *dev)
 141 {
 142         if (!dev || !dev->protocol || dev->card)
 143                 return -EINVAL;
 144         dev->dev.parent = &dev->protocol->dev;
 145         sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number, dev->number);
 146         return __pnp_add_device(dev);
 147 }
 148
 149 void __pnp_remove_device(struct pnp_dev *dev)
 150 {
 151         spin_lock(&pnp_lock);
 152         list_del(&dev->global_list);
 153         list_del(&dev->protocol_list);
 154         spin_unlock(&pnp_lock);
 155         device_unregister(&dev->dev);
 156 }
 157
 158 /**
 159  * pnp_remove_device - removes a pnp device from the pnp layer
 160  * @dev: pointer to dev to add
 161  *
 162  * this function will free all mem used by dev
 163  */
 164 #if 0
 165 void pnp_remove_device(struct pnp_dev *dev)
 166 {
 167         if (!dev || dev->card)
 168                 return;
 169         __pnp_remove_device(dev);
 170 }
 171 #endif  /*  0  */
 172
 173 static int __init pnp_init(void)
 174 {
 175         printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
 176         return bus_register(&pnp_bus_type);
 177 }
 178
 179 subsys_initcall(pnp_init);
 180
 181 #if 0
 182 EXPORT_SYMBOL(pnp_register_protocol);
 183 EXPORT_SYMBOL(pnp_unregister_protocol);
 184 EXPORT_SYMBOL(pnp_add_device);
 185 EXPORT_SYMBOL(pnp_remove_device);
 186 #endif  /*  0  */