181 строка
3.8 KiB
C
181 строка
3.8 KiB
C
/*
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* core.c - contains all core device and protocol registration functions
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*
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* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
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*
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*/
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#include <linux/pnp.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include "base.h"
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static LIST_HEAD(pnp_protocols);
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LIST_HEAD(pnp_global);
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DEFINE_SPINLOCK(pnp_lock);
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void *pnp_alloc(long size)
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{
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void *result;
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result = kmalloc(size, GFP_KERNEL);
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if (!result){
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printk(KERN_ERR "pnp: Out of Memory\n");
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return NULL;
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}
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memset(result, 0, size);
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return result;
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}
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/**
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* pnp_protocol_register - adds a pnp protocol to the pnp layer
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* @protocol: pointer to the corresponding pnp_protocol structure
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*
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* Ex protocols: ISAPNP, PNPBIOS, etc
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*/
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int pnp_register_protocol(struct pnp_protocol *protocol)
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{
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int nodenum;
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struct list_head * pos;
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if (!protocol)
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return -EINVAL;
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INIT_LIST_HEAD(&protocol->devices);
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INIT_LIST_HEAD(&protocol->cards);
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nodenum = 0;
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spin_lock(&pnp_lock);
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/* assign the lowest unused number */
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list_for_each(pos,&pnp_protocols) {
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struct pnp_protocol * cur = to_pnp_protocol(pos);
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if (cur->number == nodenum){
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pos = &pnp_protocols;
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nodenum++;
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}
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}
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list_add_tail(&protocol->protocol_list, &pnp_protocols);
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spin_unlock(&pnp_lock);
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protocol->number = nodenum;
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sprintf(protocol->dev.bus_id, "pnp%d", nodenum);
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return device_register(&protocol->dev);
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}
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/**
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* pnp_protocol_unregister - removes a pnp protocol from the pnp layer
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* @protocol: pointer to the corresponding pnp_protocol structure
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*
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*/
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void pnp_unregister_protocol(struct pnp_protocol *protocol)
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{
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spin_lock(&pnp_lock);
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list_del(&protocol->protocol_list);
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spin_unlock(&pnp_lock);
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device_unregister(&protocol->dev);
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}
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static void pnp_free_ids(struct pnp_dev *dev)
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{
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struct pnp_id * id;
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struct pnp_id * next;
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if (!dev)
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return;
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id = dev->id;
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while (id) {
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next = id->next;
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kfree(id);
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id = next;
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}
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}
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static void pnp_release_device(struct device *dmdev)
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{
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struct pnp_dev * dev = to_pnp_dev(dmdev);
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pnp_free_option(dev->independent);
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pnp_free_option(dev->dependent);
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pnp_free_ids(dev);
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kfree(dev);
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}
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int __pnp_add_device(struct pnp_dev *dev)
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{
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int ret;
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pnp_fixup_device(dev);
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dev->dev.bus = &pnp_bus_type;
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dev->dev.release = &pnp_release_device;
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dev->status = PNP_READY;
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spin_lock(&pnp_lock);
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list_add_tail(&dev->global_list, &pnp_global);
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list_add_tail(&dev->protocol_list, &dev->protocol->devices);
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spin_unlock(&pnp_lock);
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ret = device_register(&dev->dev);
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if (ret == 0)
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pnp_interface_attach_device(dev);
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return ret;
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}
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/*
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* pnp_add_device - adds a pnp device to the pnp layer
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* @dev: pointer to dev to add
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*
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* adds to driver model, name database, fixups, interface, etc.
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*/
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int pnp_add_device(struct pnp_dev *dev)
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{
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if (!dev || !dev->protocol || dev->card)
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return -EINVAL;
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dev->dev.parent = &dev->protocol->dev;
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sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number, dev->number);
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return __pnp_add_device(dev);
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}
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void __pnp_remove_device(struct pnp_dev *dev)
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{
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spin_lock(&pnp_lock);
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list_del(&dev->global_list);
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list_del(&dev->protocol_list);
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spin_unlock(&pnp_lock);
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device_unregister(&dev->dev);
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}
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/**
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* pnp_remove_device - removes a pnp device from the pnp layer
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* @dev: pointer to dev to add
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*
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* this function will free all mem used by dev
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*/
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void pnp_remove_device(struct pnp_dev *dev)
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{
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if (!dev || dev->card)
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return;
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__pnp_remove_device(dev);
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}
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static int __init pnp_init(void)
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{
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printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
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return bus_register(&pnp_bus_type);
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}
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subsys_initcall(pnp_init);
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EXPORT_SYMBOL(pnp_register_protocol);
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EXPORT_SYMBOL(pnp_unregister_protocol);
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EXPORT_SYMBOL(pnp_add_device);
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EXPORT_SYMBOL(pnp_remove_device);
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