/spare/repo/netdev-2.6 branch 'ieee80211'

[linux-2.6/verdex.git] / drivers / pci / pci-driver.c

/*
 * drivers/pci/pci-driver.c
 *
 */

#include <linux/pci.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include "pci.h"

/*
 *  Registration of PCI drivers and handling of hot-pluggable devices.
 */

/*
 * Dynamic device IDs are disabled for !CONFIG_HOTPLUG
 */

struct pci_dynid {
        struct list_head node;
        struct pci_device_id id;
};

#ifdef CONFIG_HOTPLUG

/**
 * store_new_id
 *
 * Adds a new dynamic pci device ID to this driver,
 * and causes the driver to probe for all devices again.
 */
static inline ssize_t
store_new_id(struct device_driver *driver, const char *buf, size_t count)
{
        struct pci_dynid *dynid;
        struct pci_driver *pdrv = to_pci_driver(driver);
        __u32 vendor=PCI_ANY_ID, device=PCI_ANY_ID, subvendor=PCI_ANY_ID,
                subdevice=PCI_ANY_ID, class=0, class_mask=0;
        unsigned long driver_data=0;
        int fields=0;

        fields = sscanf(buf, "%x %x %x %x %x %x %lux",
                        &vendor, &device, &subvendor, &subdevice,
                        &class, &class_mask, &driver_data);
        if (fields < 0)
                return -EINVAL;

        dynid = kmalloc(sizeof(*dynid), GFP_KERNEL);
        if (!dynid)
                return -ENOMEM;

        memset(dynid, 0, sizeof(*dynid));
        INIT_LIST_HEAD(&dynid->node);
        dynid->id.vendor = vendor;
        dynid->id.device = device;
        dynid->id.subvendor = subvendor;
        dynid->id.subdevice = subdevice;
        dynid->id.class = class;
        dynid->id.class_mask = class_mask;
        dynid->id.driver_data = pdrv->dynids.use_driver_data ?
                driver_data : 0UL;

        spin_lock(&pdrv->dynids.lock);
        list_add_tail(&pdrv->dynids.list, &dynid->node);
        spin_unlock(&pdrv->dynids.lock);

        if (get_driver(&pdrv->driver)) {
                driver_attach(&pdrv->driver);
                put_driver(&pdrv->driver);
        }

        return count;
}
static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);

static void
pci_free_dynids(struct pci_driver *drv)
{
        struct pci_dynid *dynid, *n;

        spin_lock(&drv->dynids.lock);
        list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
                list_del(&dynid->node);
                kfree(dynid);
        }
        spin_unlock(&drv->dynids.lock);
}

static int
pci_create_newid_file(struct pci_driver *drv)
{
        int error = 0;
        if (drv->probe != NULL)
                error = sysfs_create_file(&drv->driver.kobj,
                                          &driver_attr_new_id.attr);
        return error;
}

#else /* !CONFIG_HOTPLUG */
static inline void pci_free_dynids(struct pci_driver *drv) {}
static inline int pci_create_newid_file(struct pci_driver *drv)
{
        return 0;
}
#endif

/**
 * pci_match_id - See if a pci device matches a given pci_id table
 * @ids: array of PCI device id structures to search in
 * @dev: the PCI device structure to match against.
 *
 * Used by a driver to check whether a PCI device present in the
 * system is in its list of supported devices.  Returns the matching
 * pci_device_id structure or %NULL if there is no match.
 *
 * Depreciated, don't use this as it will not catch any dynamic ids
 * that a driver might want to check for.
 */
const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
                                         struct pci_dev *dev)
{
        if (ids) {
                while (ids->vendor || ids->subvendor || ids->class_mask) {
                        if (pci_match_one_device(ids, dev))
                                return ids;
                        ids++;
                }
        }
        return NULL;
}

/**
 * pci_match_device - Tell if a PCI device structure has a matching
 *                    PCI device id structure
 * @ids: array of PCI device id structures to search in
 * @dev: the PCI device structure to match against
 * @drv: the PCI driver to match against
 *
 * Used by a driver to check whether a PCI device present in the
 * system is in its list of supported devices.  Returns the matching
 * pci_device_id structure or %NULL if there is no match.
 */
const struct pci_device_id *pci_match_device(struct pci_driver *drv,
                                             struct pci_dev *dev)
{
        const struct pci_device_id *id;
        struct pci_dynid *dynid;

        id = pci_match_id(drv->id_table, dev);
        if (id)
                return id;

        /* static ids didn't match, lets look at the dynamic ones */
        spin_lock(&drv->dynids.lock);
        list_for_each_entry(dynid, &drv->dynids.list, node) {
                if (pci_match_one_device(&dynid->id, dev)) {
                        spin_unlock(&drv->dynids.lock);
                        return &dynid->id;
                }
        }
        spin_unlock(&drv->dynids.lock);
        return NULL;
}

/**
 * __pci_device_probe()
 * 
 * returns 0  on success, else error.
 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
 */
static int
__pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
{
        const struct pci_device_id *id;
        int error = 0;

        if (!pci_dev->driver && drv->probe) {
                error = -ENODEV;

                id = pci_match_device(drv, pci_dev);
                if (id)
                        error = drv->probe(pci_dev, id);
                if (error >= 0) {
                        pci_dev->driver = drv;
                        error = 0;
                }
        }
        return error;
}

static int pci_device_probe(struct device * dev)
{
        int error = 0;
        struct pci_driver *drv;
        struct pci_dev *pci_dev;

        drv = to_pci_driver(dev->driver);
        pci_dev = to_pci_dev(dev);
        pci_dev_get(pci_dev);
        error = __pci_device_probe(drv, pci_dev);
        if (error)
                pci_dev_put(pci_dev);

        return error;
}

static int pci_device_remove(struct device * dev)
{
        struct pci_dev * pci_dev = to_pci_dev(dev);
        struct pci_driver * drv = pci_dev->driver;

        if (drv) {
                if (drv->remove)
                        drv->remove(pci_dev);
                pci_dev->driver = NULL;
        }

        /*
         * We would love to complain here if pci_dev->is_enabled is set, that
         * the driver should have called pci_disable_device(), but the
         * unfortunate fact is there are too many odd BIOS and bridge setups
         * that don't like drivers doing that all of the time.  
         * Oh well, we can dream of sane hardware when we sleep, no matter how
         * horrible the crap we have to deal with is when we are awake...
         */

        pci_dev_put(pci_dev);
        return 0;
}

static int pci_device_suspend(struct device * dev, pm_message_t state)
{
        struct pci_dev * pci_dev = to_pci_dev(dev);
        struct pci_driver * drv = pci_dev->driver;
        int i = 0;

        if (drv && drv->suspend)
                i = drv->suspend(pci_dev, state);
        else
                pci_save_state(pci_dev);
        return i;
}


/* 
 * Default resume method for devices that have no driver provided resume,
 * or not even a driver at all.
 */
static void pci_default_resume(struct pci_dev *pci_dev)
{
        /* restore the PCI config space */
        pci_restore_state(pci_dev);
        /* if the device was enabled before suspend, reenable */
        if (pci_dev->is_enabled)
                pci_enable_device(pci_dev);
        /* if the device was busmaster before the suspend, make it busmaster again */
        if (pci_dev->is_busmaster)
                pci_set_master(pci_dev);
}

static int pci_device_resume(struct device * dev)
{
        struct pci_dev * pci_dev = to_pci_dev(dev);
        struct pci_driver * drv = pci_dev->driver;

        if (drv && drv->resume)
                drv->resume(pci_dev);
        else
                pci_default_resume(pci_dev);
        return 0;
}

static void pci_device_shutdown(struct device *dev)
{
        struct pci_dev *pci_dev = to_pci_dev(dev);
        struct pci_driver *drv = pci_dev->driver;

        if (drv && drv->shutdown)
                drv->shutdown(pci_dev);
}

#define kobj_to_pci_driver(obj) container_of(obj, struct device_driver, kobj)
#define attr_to_driver_attribute(obj) container_of(obj, struct driver_attribute, attr)

static ssize_t
pci_driver_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
{
        struct device_driver *driver = kobj_to_pci_driver(kobj);
        struct driver_attribute *dattr = attr_to_driver_attribute(attr);
        ssize_t ret;

        if (!get_driver(driver))
                return -ENODEV;

        ret = dattr->show ? dattr->show(driver, buf) : -EIO;

        put_driver(driver);
        return ret;
}

static ssize_t
pci_driver_attr_store(struct kobject * kobj, struct attribute *attr,
                      const char *buf, size_t count)
{
        struct device_driver *driver = kobj_to_pci_driver(kobj);
        struct driver_attribute *dattr = attr_to_driver_attribute(attr);
        ssize_t ret;

        if (!get_driver(driver))
                return -ENODEV;

        ret = dattr->store ? dattr->store(driver, buf, count) : -EIO;

        put_driver(driver);
        return ret;
}

static struct sysfs_ops pci_driver_sysfs_ops = {
        .show = pci_driver_attr_show,
        .store = pci_driver_attr_store,
};
static struct kobj_type pci_driver_kobj_type = {
        .sysfs_ops = &pci_driver_sysfs_ops,
};

/**
 * pci_register_driver - register a new pci driver
 * @drv: the driver structure to register
 * 
 * Adds the driver structure to the list of registered drivers.
 * Returns a negative value on error, otherwise 0. 
 * If no error occurred, the driver remains registered even if 
 * no device was claimed during registration.
 */
int pci_register_driver(struct pci_driver *drv)
{
        int error;

        /* initialize common driver fields */
        drv->driver.name = drv->name;
        drv->driver.bus = &pci_bus_type;
        drv->driver.probe = pci_device_probe;
        drv->driver.remove = pci_device_remove;
        /* FIXME, once all of the existing PCI drivers have been fixed to set
         * the pci shutdown function, this test can go away. */
        if (!drv->driver.shutdown)
                drv->driver.shutdown = pci_device_shutdown;
        drv->driver.owner = drv->owner;
        drv->driver.kobj.ktype = &pci_driver_kobj_type;

        spin_lock_init(&drv->dynids.lock);
        INIT_LIST_HEAD(&drv->dynids.list);

        /* register with core */
        error = driver_register(&drv->driver);

        if (!error)
                error = pci_create_newid_file(drv);

        return error;
}

/**
 * pci_unregister_driver - unregister a pci driver
 * @drv: the driver structure to unregister
 * 
 * Deletes the driver structure from the list of registered PCI drivers,
 * gives it a chance to clean up by calling its remove() function for
 * each device it was responsible for, and marks those devices as
 * driverless.
 */

void
pci_unregister_driver(struct pci_driver *drv)
{
        driver_unregister(&drv->driver);
        pci_free_dynids(drv);
}

static struct pci_driver pci_compat_driver = {
        .name = "compat"
};

/**
 * pci_dev_driver - get the pci_driver of a device
 * @dev: the device to query
 *
 * Returns the appropriate pci_driver structure or %NULL if there is no 
 * registered driver for the device.
 */
struct pci_driver *
pci_dev_driver(const struct pci_dev *dev)
{
        if (dev->driver)
                return dev->driver;
        else {
                int i;
                for(i=0; i<=PCI_ROM_RESOURCE; i++)
                        if (dev->resource[i].flags & IORESOURCE_BUSY)
                                return &pci_compat_driver;
        }
        return NULL;
}

/**
 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
 * @ids: array of PCI device id structures to search in
 * @dev: the PCI device structure to match against
 * 
 * Used by a driver to check whether a PCI device present in the
 * system is in its list of supported devices.Returns the matching
 * pci_device_id structure or %NULL if there is no match.
 */
static int pci_bus_match(struct device *dev, struct device_driver *drv)
{
        struct pci_dev *pci_dev = to_pci_dev(dev);
        struct pci_driver *pci_drv = to_pci_driver(drv);
        const struct pci_device_id *found_id;

        found_id = pci_match_device(pci_drv, pci_dev);
        if (found_id)
                return 1;

        return 0;
}

/**
 * pci_dev_get - increments the reference count of the pci device structure
 * @dev: the device being referenced
 *
 * Each live reference to a device should be refcounted.
 *
 * Drivers for PCI devices should normally record such references in
 * their probe() methods, when they bind to a device, and release
 * them by calling pci_dev_put(), in their disconnect() methods.
 *
 * A pointer to the device with the incremented reference counter is returned.
 */
struct pci_dev *pci_dev_get(struct pci_dev *dev)
{
        if (dev)
                get_device(&dev->dev);
        return dev;
}

/**
 * pci_dev_put - release a use of the pci device structure
 * @dev: device that's been disconnected
 *
 * Must be called when a user of a device is finished with it.  When the last
 * user of the device calls this function, the memory of the device is freed.
 */
void pci_dev_put(struct pci_dev *dev)
{
        if (dev)
                put_device(&dev->dev);
}

#ifndef CONFIG_HOTPLUG
int pci_hotplug (struct device *dev, char **envp, int num_envp,
                 char *buffer, int buffer_size)
{
        return -ENODEV;
}
#endif

struct bus_type pci_bus_type = {
        .name           = "pci",
        .match          = pci_bus_match,
        .hotplug        = pci_hotplug,
        .suspend        = pci_device_suspend,
        .resume         = pci_device_resume,
        .dev_attrs      = pci_dev_attrs,
};

static int __init pci_driver_init(void)
{
        return bus_register(&pci_bus_type);
}

postcore_initcall(pci_driver_init);

EXPORT_SYMBOL(pci_match_id);
EXPORT_SYMBOL(pci_match_device);
EXPORT_SYMBOL(pci_register_driver);
EXPORT_SYMBOL(pci_unregister_driver);
EXPORT_SYMBOL(pci_dev_driver);
EXPORT_SYMBOL(pci_bus_type);
EXPORT_SYMBOL(pci_dev_get);
EXPORT_SYMBOL(pci_dev_put);