Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 770 insertions, 0 deletions

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
new file mode 100644
index 000000000000..f4fa27315fb4
--- /dev/null
+++ b/drivers/base/bus.c
@@ -0,0 +1,770 @@
+/*
+ * bus.c - bus driver management
+ *
+ * Copyright (c) 2002-3 Patrick Mochel
+ * Copyright (c) 2002-3 Open Source Development Labs
+ *
+ * This file is released under the GPLv2
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include "base.h"
+#include "power/power.h"
+
+#define to_dev(node) container_of(node, struct device, bus_list)
+#define to_drv(node) container_of(node, struct device_driver, kobj.entry)
+
+#define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr)
+#define to_bus(obj) container_of(obj, struct bus_type, subsys.kset.kobj)
+
+/*
+ * sysfs bindings for drivers
+ */
+
+#define to_drv_attr(_attr) container_of(_attr, struct driver_attribute, attr)
+#define to_driver(obj) container_of(obj, struct device_driver, kobj)
+
+
+static ssize_t
+drv_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
+{
+        struct driver_attribute * drv_attr = to_drv_attr(attr);
+        struct device_driver * drv = to_driver(kobj);
+        ssize_t ret = 0;
+
+        if (drv_attr->show)
+                ret = drv_attr->show(drv, buf);
+        return ret;
+}
+
+static ssize_t
+drv_attr_store(struct kobject * kobj, struct attribute * attr,
+               const char * buf, size_t count)
+{
+        struct driver_attribute * drv_attr = to_drv_attr(attr);
+        struct device_driver * drv = to_driver(kobj);
+        ssize_t ret = 0;
+
+        if (drv_attr->store)
+                ret = drv_attr->store(drv, buf, count);
+        return ret;
+}
+
+static struct sysfs_ops driver_sysfs_ops = {
+        .show   = drv_attr_show,
+        .store  = drv_attr_store,
+};
+
+
+static void driver_release(struct kobject * kobj)
+{
+        struct device_driver * drv = to_driver(kobj);
+        complete(&drv->unloaded);
+}
+
+static struct kobj_type ktype_driver = {
+        .sysfs_ops      = &driver_sysfs_ops,
+        .release        = driver_release,
+};
+
+
+/*
+ * sysfs bindings for buses
+ */
+
+
+static ssize_t
+bus_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
+{
+        struct bus_attribute * bus_attr = to_bus_attr(attr);
+        struct bus_type * bus = to_bus(kobj);
+        ssize_t ret = 0;
+
+        if (bus_attr->show)
+                ret = bus_attr->show(bus, buf);
+        return ret;
+}
+
+static ssize_t
+bus_attr_store(struct kobject * kobj, struct attribute * attr,
+               const char * buf, size_t count)
+{
+        struct bus_attribute * bus_attr = to_bus_attr(attr);
+        struct bus_type * bus = to_bus(kobj);
+        ssize_t ret = 0;
+
+        if (bus_attr->store)
+                ret = bus_attr->store(bus, buf, count);
+        return ret;
+}
+
+static struct sysfs_ops bus_sysfs_ops = {
+        .show   = bus_attr_show,
+        .store  = bus_attr_store,
+};
+
+int bus_create_file(struct bus_type * bus, struct bus_attribute * attr)
+{
+        int error;
+        if (get_bus(bus)) {
+                error = sysfs_create_file(&bus->subsys.kset.kobj, &attr->attr);
+                put_bus(bus);
+        } else
+                error = -EINVAL;
+        return error;
+}
+
+void bus_remove_file(struct bus_type * bus, struct bus_attribute * attr)
+{
+        if (get_bus(bus)) {
+                sysfs_remove_file(&bus->subsys.kset.kobj, &attr->attr);
+                put_bus(bus);
+        }
+}
+
+static struct kobj_type ktype_bus = {
+        .sysfs_ops      = &bus_sysfs_ops,
+
+};
+
+decl_subsys(bus, &ktype_bus, NULL);
+
+static int __bus_for_each_dev(struct bus_type *bus, struct device *start,
+                              void *data, int (*fn)(struct device *, void *))
+{
+        struct list_head *head;
+        struct device *dev;
+        int error = 0;
+
+        if (!(bus = get_bus(bus)))
+                return -EINVAL;
+
+        head = &bus->devices.list;
+        dev = list_prepare_entry(start, head, bus_list);
+        list_for_each_entry_continue(dev, head, bus_list) {
+                get_device(dev);
+                error = fn(dev, data);
+                put_device(dev);
+                if (error)
+                        break;
+        }
+        put_bus(bus);
+        return error;
+}
+
+static int __bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
+                              void * data, int (*fn)(struct device_driver *, void *))
+{
+        struct list_head *head;
+        struct device_driver *drv;
+        int error = 0;
+
+        if (!(bus = get_bus(bus)))
+                return -EINVAL;
+
+        head = &bus->drivers.list;
+        drv = list_prepare_entry(start, head, kobj.entry);
+        list_for_each_entry_continue(drv, head, kobj.entry) {
+                get_driver(drv);
+                error = fn(drv, data);
+                put_driver(drv);
+                if (error)
+                        break;
+        }
+        put_bus(bus);
+        return error;
+}
+
+/**
+ *      bus_for_each_dev - device iterator.
+ *      @bus:   bus type.
+ *      @start: device to start iterating from.
+ *      @data:  data for the callback.
+ *      @fn:    function to be called for each device.
+ *
+ *      Iterate over @bus's list of devices, and call @fn for each,
+ *      passing it @data. If @start is not NULL, we use that device to
+ *      begin iterating from.
+ *
+ *      We check the return of @fn each time. If it returns anything
+ *      other than 0, we break out and return that value.
+ *
+ *      NOTE: The device that returns a non-zero value is not retained
+ *      in any way, nor is its refcount incremented. If the caller needs
+ *      to retain this data, it should do, and increment the reference
+ *      count in the supplied callback.
+ */
+
+int bus_for_each_dev(struct bus_type * bus, struct device * start,
+                     void * data, int (*fn)(struct device *, void *))
+{
+        int ret;
+
+        down_read(&bus->subsys.rwsem);
+        ret = __bus_for_each_dev(bus, start, data, fn);
+        up_read(&bus->subsys.rwsem);
+        return ret;
+}
+
+/**
+ *      bus_for_each_drv - driver iterator
+ *      @bus:   bus we're dealing with.
+ *      @start: driver to start iterating on.
+ *      @data:  data to pass to the callback.
+ *      @fn:    function to call for each driver.
+ *
+ *      This is nearly identical to the device iterator above.
+ *      We iterate over each driver that belongs to @bus, and call
+ *      @fn for each. If @fn returns anything but 0, we break out
+ *      and return it. If @start is not NULL, we use it as the head
+ *      of the list.
+ *
+ *      NOTE: we don't return the driver that returns a non-zero
+ *      value, nor do we leave the reference count incremented for that
+ *      driver. If the caller needs to know that info, it must set it
+ *      in the callback. It must also be sure to increment the refcount
+ *      so it doesn't disappear before returning to the caller.
+ */
+
+int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
+                     void * data, int (*fn)(struct device_driver *, void *))
+{
+        int ret;
+
+        down_read(&bus->subsys.rwsem);
+        ret = __bus_for_each_drv(bus, start, data, fn);
+        up_read(&bus->subsys.rwsem);
+        return ret;
+}
+
+/**
+ *      device_bind_driver - bind a driver to one device.
+ *      @dev:   device.
+ *
+ *      Allow manual attachment of a driver to a device.
+ *      Caller must have already set @dev->driver.
+ *
+ *      Note that this does not modify the bus reference count
+ *      nor take the bus's rwsem. Please verify those are accounted
+ *      for before calling this. (It is ok to call with no other effort
+ *      from a driver's probe() method.)
+ */
+
+void device_bind_driver(struct device * dev)
+{
+        pr_debug("bound device '%s' to driver '%s'\n",
+                 dev->bus_id, dev->driver->name);
+        list_add_tail(&dev->driver_list, &dev->driver->devices);
+        sysfs_create_link(&dev->driver->kobj, &dev->kobj,
+                          kobject_name(&dev->kobj));
+        sysfs_create_link(&dev->kobj, &dev->driver->kobj, "driver");
+}
+
+
+/**
+ *      driver_probe_device - attempt to bind device & driver.
+ *      @drv:   driver.
+ *      @dev:   device.
+ *
+ *      First, we call the bus's match function, if one present, which
+ *      should compare the device IDs the driver supports with the
+ *      device IDs of the device. Note we don't do this ourselves
+ *      because we don't know the format of the ID structures, nor what
+ *      is to be considered a match and what is not.
+ *
+ *      If we find a match, we call @drv->probe(@dev) if it exists, and
+ *      call device_bind_driver() above.
+ */
+int driver_probe_device(struct device_driver * drv, struct device * dev)
+{
+        if (drv->bus->match && !drv->bus->match(dev, drv))
+                return -ENODEV;
+
+        dev->driver = drv;
+        if (drv->probe) {
+                int error = drv->probe(dev);
+                if (error) {
+                        dev->driver = NULL;
+                        return error;
+                }
+        }
+
+        device_bind_driver(dev);
+        return 0;
+}
+
+
+/**
+ *      device_attach - try to attach device to a driver.
+ *      @dev:   device.
+ *
+ *      Walk the list of drivers that the bus has and call
+ *      driver_probe_device() for each pair. If a compatible
+ *      pair is found, break out and return.
+ */
+int device_attach(struct device * dev)
+{
+        struct bus_type * bus = dev->bus;
+        struct list_head * entry;
+        int error;
+
+        if (dev->driver) {
+                device_bind_driver(dev);
+                return 1;
+        }
+
+        if (bus->match) {
+                list_for_each(entry, &bus->drivers.list) {
+                        struct device_driver * drv = to_drv(entry);
+                        error = driver_probe_device(drv, dev);
+                        if (!error)
+                                /* success, driver matched */
+                                return 1;
+                        if (error != -ENODEV && error != -ENXIO)
+                                /* driver matched but the probe failed */
+                                printk(KERN_WARNING
+                                    "%s: probe of %s failed with error %d\n",
+                                    drv->name, dev->bus_id, error);
+                }
+        }
+
+        return 0;
+}
+
+
+/**
+ *      driver_attach - try to bind driver to devices.
+ *      @drv:   driver.
+ *
+ *      Walk the list of devices that the bus has on it and try to
+ *      match the driver with each one.  If driver_probe_device()
+ *      returns 0 and the @dev->driver is set, we've found a
+ *      compatible pair.
+ *
+ *      Note that we ignore the -ENODEV error from driver_probe_device(),
+ *      since it's perfectly valid for a driver not to bind to any devices.
+ */
+void driver_attach(struct device_driver * drv)
+{
+        struct bus_type * bus = drv->bus;
+        struct list_head * entry;
+        int error;
+
+        if (!bus->match)
+                return;
+
+        list_for_each(entry, &bus->devices.list) {
+                struct device * dev = container_of(entry, struct device, bus_list);
+                if (!dev->driver) {
+                        error = driver_probe_device(drv, dev);
+                        if (error && (error != -ENODEV))
+                                /* driver matched but the probe failed */
+                                printk(KERN_WARNING
+                                    "%s: probe of %s failed with error %d\n",
+                                    drv->name, dev->bus_id, error);
+                }
+        }
+}
+
+
+/**
+ *      device_release_driver - manually detach device from driver.
+ *      @dev:   device.
+ *
+ *      Manually detach device from driver.
+ *      Note that this is called without incrementing the bus
+ *      reference count nor taking the bus's rwsem. Be sure that
+ *      those are accounted for before calling this function.
+ */
+
+void device_release_driver(struct device * dev)
+{
+        struct device_driver * drv = dev->driver;
+        if (drv) {
+                sysfs_remove_link(&drv->kobj, kobject_name(&dev->kobj));
+                sysfs_remove_link(&dev->kobj, "driver");
+                list_del_init(&dev->driver_list);
+                device_detach_shutdown(dev);
+                if (drv->remove)
+                        drv->remove(dev);
+                dev->driver = NULL;
+        }
+}
+
+
+/**
+ *      driver_detach - detach driver from all devices it controls.
+ *      @drv:   driver.
+ */
+
+static void driver_detach(struct device_driver * drv)
+{
+        struct list_head * entry, * next;
+        list_for_each_safe(entry, next, &drv->devices) {
+                struct device * dev = container_of(entry, struct device, driver_list);
+                device_release_driver(dev);
+        }
+}
+
+static int device_add_attrs(struct bus_type * bus, struct device * dev)
+{
+        int error = 0;
+        int i;
+
+        if (bus->dev_attrs) {
+                for (i = 0; attr_name(bus->dev_attrs[i]); i++) {
+                        error = device_create_file(dev,&bus->dev_attrs[i]);
+                        if (error)
+                                goto Err;
+                }
+        }
+ Done:
+        return error;
+ Err:
+        while (--i >= 0)
+                device_remove_file(dev,&bus->dev_attrs[i]);
+        goto Done;
+}
+
+
+static void device_remove_attrs(struct bus_type * bus, struct device * dev)
+{
+        int i;
+
+        if (bus->dev_attrs) {
+                for (i = 0; attr_name(bus->dev_attrs[i]); i++)
+                        device_remove_file(dev,&bus->dev_attrs[i]);
+        }
+}
+
+
+/**
+ *      bus_add_device - add device to bus
+ *      @dev:   device being added
+ *
+ *      - Add the device to its bus's list of devices.
+ *      - Try to attach to driver.
+ *      - Create link to device's physical location.
+ */
+int bus_add_device(struct device * dev)
+{
+        struct bus_type * bus = get_bus(dev->bus);
+        int error = 0;
+
+        if (bus) {
+                down_write(&dev->bus->subsys.rwsem);
+                pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id);
+                list_add_tail(&dev->bus_list, &dev->bus->devices.list);
+                device_attach(dev);
+                up_write(&dev->bus->subsys.rwsem);
+                device_add_attrs(bus, dev);
+                sysfs_create_link(&bus->devices.kobj, &dev->kobj, dev->bus_id);
+                sysfs_create_link(&dev->kobj, &dev->bus->subsys.kset.kobj, "bus");
+        }
+        return error;
+}
+
+/**
+ *      bus_remove_device - remove device from bus
+ *      @dev:   device to be removed
+ *
+ *      - Remove symlink from bus's directory.
+ *      - Delete device from bus's list.
+ *      - Detach from its driver.
+ *      - Drop reference taken in bus_add_device().
+ */
+void bus_remove_device(struct device * dev)
+{
+        if (dev->bus) {
+                sysfs_remove_link(&dev->kobj, "bus");
+                sysfs_remove_link(&dev->bus->devices.kobj, dev->bus_id);
+                device_remove_attrs(dev->bus, dev);
+                down_write(&dev->bus->subsys.rwsem);
+                pr_debug("bus %s: remove device %s\n", dev->bus->name, dev->bus_id);
+                device_release_driver(dev);
+                list_del_init(&dev->bus_list);
+                up_write(&dev->bus->subsys.rwsem);
+                put_bus(dev->bus);
+        }
+}
+
+static int driver_add_attrs(struct bus_type * bus, struct device_driver * drv)
+{
+        int error = 0;
+        int i;
+
+        if (bus->drv_attrs) {
+                for (i = 0; attr_name(bus->drv_attrs[i]); i++) {
+                        error = driver_create_file(drv, &bus->drv_attrs[i]);
+                        if (error)
+                                goto Err;
+                }
+        }
+ Done:
+        return error;
+ Err:
+        while (--i >= 0)
+                driver_remove_file(drv, &bus->drv_attrs[i]);
+        goto Done;
+}
+
+
+static void driver_remove_attrs(struct bus_type * bus, struct device_driver * drv)
+{
+        int i;
+
+        if (bus->drv_attrs) {
+                for (i = 0; attr_name(bus->drv_attrs[i]); i++)
+                        driver_remove_file(drv, &bus->drv_attrs[i]);
+        }
+}
+
+
+/**
+ *      bus_add_driver - Add a driver to the bus.
+ *      @drv:   driver.
+ *
+ */
+int bus_add_driver(struct device_driver * drv)
+{
+        struct bus_type * bus = get_bus(drv->bus);
+        int error = 0;
+
+        if (bus) {
+                pr_debug("bus %s: add driver %s\n", bus->name, drv->name);
+                error = kobject_set_name(&drv->kobj, "%s", drv->name);
+                if (error) {
+                        put_bus(bus);
+                        return error;
+                }
+                drv->kobj.kset = &bus->drivers;
+                if ((error = kobject_register(&drv->kobj))) {
+                        put_bus(bus);
+                        return error;
+                }
+
+                down_write(&bus->subsys.rwsem);
+                driver_attach(drv);
+                up_write(&bus->subsys.rwsem);
+                module_add_driver(drv->owner, drv);
+
+                driver_add_attrs(bus, drv);
+        }
+        return error;
+}
+
+
+/**
+ *      bus_remove_driver - delete driver from bus's knowledge.
+ *      @drv:   driver.
+ *
+ *      Detach the driver from the devices it controls, and remove
+ *      it from its bus's list of drivers. Finally, we drop the reference
+ *      to the bus we took in bus_add_driver().
+ */
+
+void bus_remove_driver(struct device_driver * drv)
+{
+        if (drv->bus) {
+                driver_remove_attrs(drv->bus, drv);
+                down_write(&drv->bus->subsys.rwsem);
+                pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name);
+                driver_detach(drv);
+                up_write(&drv->bus->subsys.rwsem);
+                module_remove_driver(drv);
+                kobject_unregister(&drv->kobj);
+                put_bus(drv->bus);
+        }
+}
+
+
+/* Helper for bus_rescan_devices's iter */
+static int bus_rescan_devices_helper(struct device *dev, void *data)
+{
+        int *count = data;
+
+        if (!dev->driver && device_attach(dev))
+                (*count)++;
+
+        return 0;
+}
+
+
+/**
+ *      bus_rescan_devices - rescan devices on the bus for possible drivers
+ *      @bus:   the bus to scan.
+ *
+ *      This function will look for devices on the bus with no driver
+ *      attached and rescan it against existing drivers to see if it
+ *      matches any. Calls device_attach(). Returns the number of devices
+ *      that were sucessfully bound to a driver.
+ */
+int bus_rescan_devices(struct bus_type * bus)
+{
+        int count = 0;
+
+        down_write(&bus->subsys.rwsem);
+        __bus_for_each_dev(bus, NULL, &count, bus_rescan_devices_helper);
+        up_write(&bus->subsys.rwsem);
+
+        return count;
+}
+
+
+struct bus_type * get_bus(struct bus_type * bus)
+{
+        return bus ? container_of(subsys_get(&bus->subsys), struct bus_type, subsys) : NULL;
+}
+
+void put_bus(struct bus_type * bus)
+{
+        subsys_put(&bus->subsys);
+}
+
+
+/**
+ *      find_bus - locate bus by name.
+ *      @name:  name of bus.
+ *
+ *      Call kset_find_obj() to iterate over list of buses to
+ *      find a bus by name. Return bus if found.
+ *
+ *      Note that kset_find_obj increments bus' reference count.
+ */
+
+struct bus_type * find_bus(char * name)
+{
+        struct kobject * k = kset_find_obj(&bus_subsys.kset, name);
+        return k ? to_bus(k) : NULL;
+}
+
+
+/**
+ *      bus_add_attrs - Add default attributes for this bus.
+ *      @bus:   Bus that has just been registered.
+ */
+
+static int bus_add_attrs(struct bus_type * bus)
+{
+        int error = 0;
+        int i;
+
+        if (bus->bus_attrs) {
+                for (i = 0; attr_name(bus->bus_attrs[i]); i++) {
+                        if ((error = bus_create_file(bus,&bus->bus_attrs[i])))
+                                goto Err;
+                }
+        }
+ Done:
+        return error;
+ Err:
+        while (--i >= 0)
+                bus_remove_file(bus,&bus->bus_attrs[i]);
+        goto Done;
+}
+
+static void bus_remove_attrs(struct bus_type * bus)
+{
+        int i;
+
+        if (bus->bus_attrs) {
+                for (i = 0; attr_name(bus->bus_attrs[i]); i++)
+                        bus_remove_file(bus,&bus->bus_attrs[i]);
+        }
+}
+
+/**
+ *      bus_register - register a bus with the system.
+ *      @bus:   bus.
+ *
+ *      Once we have that, we registered the bus with the kobject
+ *      infrastructure, then register the children subsystems it has:
+ *      the devices and drivers that belong to the bus.
+ */
+int bus_register(struct bus_type * bus)
+{
+        int retval;
+
+        retval = kobject_set_name(&bus->subsys.kset.kobj, "%s", bus->name);
+        if (retval)
+                goto out;
+
+        subsys_set_kset(bus, bus_subsys);
+        retval = subsystem_register(&bus->subsys);
+        if (retval)
+                goto out;
+
+        kobject_set_name(&bus->devices.kobj, "devices");
+        bus->devices.subsys = &bus->subsys;
+        retval = kset_register(&bus->devices);
+        if (retval)
+                goto bus_devices_fail;
+
+        kobject_set_name(&bus->drivers.kobj, "drivers");
+        bus->drivers.subsys = &bus->subsys;
+        bus->drivers.ktype = &ktype_driver;
+        retval = kset_register(&bus->drivers);
+        if (retval)
+                goto bus_drivers_fail;
+        bus_add_attrs(bus);
+
+        pr_debug("bus type '%s' registered\n", bus->name);
+        return 0;
+
+bus_drivers_fail:
+        kset_unregister(&bus->devices);
+bus_devices_fail:
+        subsystem_unregister(&bus->subsys);
+out:
+        return retval;
+}
+
+
+/**
+ *      bus_unregister - remove a bus from the system
+ *      @bus:   bus.
+ *
+ *      Unregister the child subsystems and the bus itself.
+ *      Finally, we call put_bus() to release the refcount
+ */
+void bus_unregister(struct bus_type * bus)
+{
+        pr_debug("bus %s: unregistering\n", bus->name);
+        bus_remove_attrs(bus);
+        kset_unregister(&bus->drivers);
+        kset_unregister(&bus->devices);
+        subsystem_unregister(&bus->subsys);
+}
+
+int __init buses_init(void)
+{
+        return subsystem_register(&bus_subsys);
+}
+
+
+EXPORT_SYMBOL_GPL(bus_for_each_dev);
+EXPORT_SYMBOL_GPL(bus_for_each_drv);
+
+EXPORT_SYMBOL_GPL(driver_probe_device);
+EXPORT_SYMBOL_GPL(device_bind_driver);
+EXPORT_SYMBOL_GPL(device_release_driver);
+EXPORT_SYMBOL_GPL(device_attach);
+EXPORT_SYMBOL_GPL(driver_attach);
+
+EXPORT_SYMBOL_GPL(bus_add_device);
+EXPORT_SYMBOL_GPL(bus_remove_device);
+EXPORT_SYMBOL_GPL(bus_register);
+EXPORT_SYMBOL_GPL(bus_unregister);
+EXPORT_SYMBOL_GPL(bus_rescan_devices);
+EXPORT_SYMBOL_GPL(get_bus);
+EXPORT_SYMBOL_GPL(put_bus);
+EXPORT_SYMBOL_GPL(find_bus);
+
+EXPORT_SYMBOL_GPL(bus_create_file);
+EXPORT_SYMBOL_GPL(bus_remove_file);