1 files changed, 531 insertions, 0 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
new file mode 100644
index 00000000000..37b7961efc4
--- /dev/null
+++ b/drivers/pci/pci-driver.c
@@ -0,0 +1,531 @@
+/*
+ * drivers/pci/pci-driver.c
+ *
+ */
+
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/pci-dynids.h>
+#include "pci.h"
+
+/*
+ *  Registration of PCI drivers and handling of hot-pluggable devices.
+ */
+
+/*
+ * Dynamic device IDs are disabled for !CONFIG_HOTPLUG
+ */
+
+#ifdef CONFIG_HOTPLUG
+/**
+ * pci_device_probe_dynamic()
+ *
+ * Walk the dynamic ID list looking for a match.
+ * returns 0 and sets pci_dev->driver when drv claims pci_dev, else error.
+ */
+static int
+pci_device_probe_dynamic(struct pci_driver *drv, struct pci_dev *pci_dev)
+{
+	int error = -ENODEV;
+	struct list_head *pos;
+	struct dynid *dynid;
+
+	spin_lock(&drv->dynids.lock);
+	list_for_each(pos, &drv->dynids.list) {
+		dynid = list_entry(pos, struct dynid, node);
+		if (pci_match_one_device(&dynid->id, pci_dev)) {
+			spin_unlock(&drv->dynids.lock);
+			error = drv->probe(pci_dev, &dynid->id);
+			if (error >= 0) {
+				pci_dev->driver = drv;
+				return 0;
+			}
+			return error;
+		}
+	}
+	spin_unlock(&drv->dynids.lock);
+	return error;
+}
+
+/**
+ * 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 dynid *dynid;
+	struct bus_type * bus;
+	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);
+
+	bus = get_bus(pdrv->driver.bus);
+	if (bus) {
+		if (get_driver(&pdrv->driver)) {
+			down_write(&bus->subsys.rwsem);
+			driver_attach(&pdrv->driver);
+			up_write(&bus->subsys.rwsem);
+			put_driver(&pdrv->driver);
+		}
+		put_bus(bus);
+	}
+
+	return count;
+}
+
+static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
+static inline void
+pci_init_dynids(struct pci_dynids *dynids)
+{
+	spin_lock_init(&dynids->lock);
+	INIT_LIST_HEAD(&dynids->list);
+}
+
+static void
+pci_free_dynids(struct pci_driver *drv)
+{
+	struct list_head *pos, *n;
+	struct dynid *dynid;
+
+	spin_lock(&drv->dynids.lock);
+	list_for_each_safe(pos, n, &drv->dynids.list) {
+		dynid = list_entry(pos, struct dynid, 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;
+}
+
+static int
+pci_bus_match_dynids(const struct pci_dev *pci_dev, struct pci_driver *pci_drv)
+{
+	struct list_head *pos;
+	struct dynid *dynid;
+
+	spin_lock(&pci_drv->dynids.lock);
+	list_for_each(pos, &pci_drv->dynids.list) {
+		dynid = list_entry(pos, struct dynid, node);
+		if (pci_match_one_device(&dynid->id, pci_dev)) {
+			spin_unlock(&pci_drv->dynids.lock);
+			return 1;
+		}
+	}
+	spin_unlock(&pci_drv->dynids.lock);
+	return 0;
+}
+
+#else /* !CONFIG_HOTPLUG */
+static inline int pci_device_probe_dynamic(struct pci_driver *drv, struct pci_dev *pci_dev)
+{
+	return -ENODEV;
+}
+static inline void pci_init_dynids(struct pci_dynids *dynids) {}
+static inline void pci_free_dynids(struct pci_driver *drv) {}
+static inline int pci_create_newid_file(struct pci_driver *drv)
+{
+	return 0;
+}
+static inline int pci_bus_match_dynids(const struct pci_dev *pci_dev, struct pci_driver *pci_drv)
+{
+	return 0;
+}
+#endif
+
+/**
+ * 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
+ * 
+ * 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(const struct pci_device_id *ids, const struct pci_dev *dev)
+{
+	while (ids->vendor || ids->subvendor || ids->class_mask) {
+		if (pci_match_one_device(ids, dev))
+			return ids;
+		ids++;
+	}
+	return NULL;
+}
+
+/**
+ * pci_device_probe_static()
+ * 
+ * returns 0 and sets pci_dev->driver when drv claims pci_dev, else error.
+ */
+static int
+pci_device_probe_static(struct pci_driver *drv, struct pci_dev *pci_dev)
+{		   
+	int error = -ENODEV;
+	const struct pci_device_id *id;
+
+	if (!drv->id_table)
+		return error;
+	id = pci_match_device(drv->id_table, pci_dev);
+	if (id)
+		error = drv->probe(pci_dev, id);
+	if (error >= 0) {
+		pci_dev->driver = drv;
+		error = 0;
+	}
+	return error;
+}
+
+/**
+ * __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)
+{		   
+	int error = 0;
+
+	if (!pci_dev->driver && drv->probe) {
+		error = pci_device_probe_static(drv, pci_dev);
+		if (error == -ENODEV)
+			error = pci_device_probe_dynamic(drv, pci_dev);
+	}
+	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;
+}
+
+
+#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 = 0;
+
+	if (get_driver(driver)) {
+		if (dattr->show)
+			ret = dattr->show(driver, buf);
+		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 = 0;
+
+	if (get_driver(driver)) {
+		if (dattr->store)
+			ret = dattr->store(driver, buf, count);
+		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,
+};
+
+static int
+pci_populate_driver_dir(struct pci_driver *drv)
+{
+	return pci_create_newid_file(drv);
+}
+
+/**
+ * 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 occured, 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;
+	drv->driver.owner = drv->owner;
+	drv->driver.kobj.ktype = &pci_driver_kobj_type;
+	pci_init_dynids(&drv->dynids);
+
+	/* register with core */
+	error = driver_register(&drv->driver);
+
+	if (!error)
+		pci_populate_driver_dir(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) 
+{
+	const struct pci_dev * pci_dev = to_pci_dev(dev);
+	struct pci_driver * pci_drv = to_pci_driver(drv);
+	const struct pci_device_id * ids = pci_drv->id_table;
+	const struct pci_device_id *found_id;
+
+	if (!ids)
+		return 0;
+
+	found_id = pci_match_device(ids, pci_dev);
+	if (found_id)
+		return 1;
+
+	return pci_bus_match_dynids(pci_dev, pci_drv);
+}
+
+/**
+ * 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_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);