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         if (!protocol)
  56                 return -EINVAL;
  57
  58         INIT_LIST_HEAD(&protocol->devices);
  59         INIT_LIST_HEAD(&protocol->cards);
  60         nodenum = 0;
  61         spin_lock(&pnp_lock);
  62
  63         /* assign the lowest unused number */
  64         list_for_each(pos, &pnp_protocols) {
  65                 struct pnp_protocol *cur = to_pnp_protocol(pos);
  66                 if (cur->number == nodenum) {
  67                         pos = &pnp_protocols;
  68                         nodenum++;
  69                 }
  70         }
  71
  72         list_add_tail(&protocol->protocol_list, &pnp_protocols);
  73         spin_unlock(&pnp_lock);
  74
  75         protocol->number = nodenum;
  76         sprintf(protocol->dev.bus_id, "pnp%d", nodenum);
  77         return device_register(&protocol->dev);
  78 }
  79
  80 /**
  81  * pnp_protocol_unregister - removes a pnp protocol from the pnp layer
  82  * @protocol: pointer to the corresponding pnp_protocol structure
  83  */
  84 void pnp_unregister_protocol(struct pnp_protocol *protocol)
  85 {
  86         spin_lock(&pnp_lock);
  87         list_del(&protocol->protocol_list);
  88         spin_unlock(&pnp_lock);
  89         device_unregister(&protocol->dev);
  90 }
  91
  92 static void pnp_free_ids(struct pnp_dev *dev)
  93 {
  94         struct pnp_id *id;
  95         struct pnp_id *next;
  96
  97         if (!dev)
  98                 return;
  99         id = dev->id;
 100         while (id) {
 101                 next = id->next;
 102                 kfree(id);
 103                 id = next;
 104         }
 105 }
 106
 107 static void pnp_release_device(struct device *dmdev)
 108 {
 109         struct pnp_dev *dev = to_pnp_dev(dmdev);
 110
 111         pnp_free_option(dev->independent);
 112         pnp_free_option(dev->dependent);
 113         pnp_free_ids(dev);
 114         kfree(dev);
 115 }
 116
 117 int __pnp_add_device(struct pnp_dev *dev)
 118 {
 119         int ret;
 120
 121         pnp_fixup_device(dev);
 122         dev->dev.bus = &pnp_bus_type;
 123         dev->dev.dma_mask = &dev->dma_mask;
 124         dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK;
 125         dev->dev.release = &pnp_release_device;
 126         dev->status = PNP_READY;
 127         spin_lock(&pnp_lock);
 128         list_add_tail(&dev->global_list, &pnp_global);
 129         list_add_tail(&dev->protocol_list, &dev->protocol->devices);
 130         spin_unlock(&pnp_lock);
 131
 132         ret = device_register(&dev->dev);
 133         if (ret == 0)
 134                 pnp_interface_attach_device(dev);
 135         return ret;
 136 }
 137
 138 /*
 139  * pnp_add_device - adds a pnp device to the pnp layer
 140  * @dev: pointer to dev to add
 141  *
 142  *  adds to driver model, name database, fixups, interface, etc.
 143  */
 144 int pnp_add_device(struct pnp_dev *dev)
 145 {
 146         if (!dev || !dev->protocol || dev->card)
 147                 return -EINVAL;
 148         dev->dev.parent = &dev->protocol->dev;
 149         sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number,
 150                 dev->number);
 151         return __pnp_add_device(dev);
 152 }
 153
 154 void __pnp_remove_device(struct pnp_dev *dev)
 155 {
 156         spin_lock(&pnp_lock);
 157         list_del(&dev->global_list);
 158         list_del(&dev->protocol_list);
 159         spin_unlock(&pnp_lock);
 160         device_unregister(&dev->dev);
 161 }
 162
 163 static int __init pnp_init(void)
 164 {
 165         printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
 166         return bus_register(&pnp_bus_type);
 167 }
 168
 169 subsys_initcall(pnp_init);