core.c

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/*
 * core.c - contains all core device and protocol registration functions
 *
 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
 */

#include <linux/pnp.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/dma-mapping.h>

#include "base.h"

static LIST_HEAD(pnp_protocols);
LIST_HEAD(pnp_global);
DEFINE_SPINLOCK(pnp_lock);

/*
 * ACPI or PNPBIOS should tell us about all platform devices, so we can
 * skip some blind probes.  ISAPNP typically enumerates only plug-in ISA
 * devices, not built-in things like COM ports.
 */
int pnp_platform_devices;
EXPORT_SYMBOL(pnp_platform_devices);

void *pnp_alloc(long size)
{
    void *result;

    result = kzalloc(size, GFP_KERNEL);
    if (!result) {
        printk(KERN_ERR "pnp: Out of Memory\n");
        return NULL;
    }
    return result;
}

int pnp_register_protocol(struct pnp_protocol *protocol)
{
    int nodenum;
    struct list_head *pos;

    INIT_LIST_HEAD(&protocol->devices);
    INIT_LIST_HEAD(&protocol->cards);
    nodenum = 0;
    spin_lock(&pnp_lock);

    /* assign the lowest unused number */
    list_for_each(pos, &pnp_protocols) {
        struct pnp_protocol *cur = to_pnp_protocol(pos);
        if (cur->number == nodenum) {
            pos = &pnp_protocols;
            nodenum++;
        }
    }

    list_add_tail(&protocol->protocol_list, &pnp_protocols);
    spin_unlock(&pnp_lock);

    protocol->number = nodenum;
    dev_set_name(&protocol->dev, "pnp%d", nodenum);
    return device_register(&protocol->dev);
}

void pnp_unregister_protocol(struct pnp_protocol *protocol)
{
    spin_lock(&pnp_lock);
    list_del(&protocol->protocol_list);
    spin_unlock(&pnp_lock);
    device_unregister(&protocol->dev);
}

static void pnp_free_ids(struct pnp_dev *dev)
{
    struct pnp_id *id;
    struct pnp_id *next;

    id = dev->id;
    while (id) {
        next = id->next;
        kfree(id);
        id = next;
    }
}

void pnp_free_resource(struct pnp_resource *pnp_res)
{
    list_del(&pnp_res->list);
    kfree(pnp_res);
}

void pnp_free_resources(struct pnp_dev *dev)
{
    struct pnp_resource *pnp_res, *tmp;

    list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
        pnp_free_resource(pnp_res);
    }
}

static void pnp_release_device(struct device *dmdev)
{
    struct pnp_dev *dev = to_pnp_dev(dmdev);

    pnp_free_ids(dev);
    pnp_free_resources(dev);
    pnp_free_options(dev);
    kfree(dev);
}

struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id,
                  const char *pnpid)
{
    struct pnp_dev *dev;
    struct pnp_id *dev_id;

    dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
    if (!dev)
        return NULL;

    INIT_LIST_HEAD(&dev->resources);
    INIT_LIST_HEAD(&dev->options);
    dev->protocol = protocol;
    dev->number = id;
    dev->dma_mask = DMA_BIT_MASK(24);

    dev->dev.parent = &dev->protocol->dev;
    dev->dev.bus = &pnp_bus_type;
    dev->dev.dma_mask = &dev->dma_mask;
    dev->dev.coherent_dma_mask = dev->dma_mask;
    dev->dev.release = &pnp_release_device;

    dev_set_name(&dev->dev, "%02x:%02x", dev->protocol->number, dev->number);

    dev_id = pnp_add_id(dev, pnpid);
    if (!dev_id) {
        kfree(dev);
        return NULL;
    }

    return dev;
}

int __pnp_add_device(struct pnp_dev *dev)
{
    pnp_fixup_device(dev);
    dev->status = PNP_READY;
    spin_lock(&pnp_lock);
    list_add_tail(&dev->global_list, &pnp_global);
    list_add_tail(&dev->protocol_list, &dev->protocol->devices);
    spin_unlock(&pnp_lock);
    if (dev->protocol->can_wakeup)
        device_set_wakeup_capable(&dev->dev,
                dev->protocol->can_wakeup(dev));
    return device_register(&dev->dev);
}

/*
 * pnp_add_device - adds a pnp device to the pnp layer
 * @dev: pointer to dev to add
 *
 *  adds to driver model, name database, fixups, interface, etc.
 */
int pnp_add_device(struct pnp_dev *dev)
{
    int ret;
    char buf[128];
    int len = 0;
    struct pnp_id *id;

    if (dev->card)
        return -EINVAL;

    ret = __pnp_add_device(dev);
    if (ret)
        return ret;

    buf[0] = '\0';
    for (id = dev->id; id; id = id->next)
        len += scnprintf(buf + len, sizeof(buf) - len, " %s", id->id);

    dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs%s (%s)\n",
           dev->protocol->name, buf,
           dev->active ? "active" : "disabled");
    return 0;
}

void __pnp_remove_device(struct pnp_dev *dev)
{
    spin_lock(&pnp_lock);
    list_del(&dev->global_list);
    list_del(&dev->protocol_list);
    spin_unlock(&pnp_lock);
    device_unregister(&dev->dev);
}

static int __init pnp_init(void)
{
    return bus_register(&pnp_bus_type);
}

subsys_initcall(pnp_init);

int pnp_debug;

#if defined(CONFIG_PNP_DEBUG_MESSAGES)
module_param_named(debug, pnp_debug, int, 0644);
#endif