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 static void pnp_release_device(struct device *dmdev)
 103 {
 104         struct pnp_dev *dev = to_pnp_dev(dmdev);
 105
 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
 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 int pnp_add_device(struct pnp_dev *dev)
 140 {
 141         if (dev->card)
 142                 return -EINVAL;
 143         dev->dev.parent = &dev->protocol->dev;
 144         sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number,
 145                 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 static int __init pnp_init(void)
 159 {
 160         printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
 161         return bus_register(&pnp_bus_type);
 162 }
 163
 164 subsys_initcall(pnp_init);