From 07e4a3e27fe414980ddc85a358e5a56abc48b363 Mon Sep 17 00:00:00 2001 From: "mochel@digitalimplant.org" Date: Mon, 21 Mar 2005 10:52:54 -0800 Subject: [PATCH] [PATCH] Move device/driver code to drivers/base/dd.c This relocates the driver binding/unbinding code to drivers/base/dd.c. This is done for two reasons: One, it's not code related to the bus_type itself; it uses some from that, some from devices, and some from drivers. And Two, it will make it easier to do some of the upcoming lock removal on that code.. Signed-off-by: Patrick Mochel Signed-off-by: Greg Kroah-Hartman --- drivers/base/Makefile | 2 +- drivers/base/base.h | 2 + drivers/base/bus.c | 182 -------------------------------------- drivers/base/dd.c | 200 ++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 203 insertions(+), 183 deletions(-) create mode 100644 drivers/base/dd.c diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 771f6c80e82..66d9c4643fc 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -1,6 +1,6 @@ # Makefile for the Linux device tree -obj-y := core.o sys.o bus.o \ +obj-y := core.o sys.o bus.o dd.o \ driver.o class.o platform.o \ cpu.o firmware.o init.o map.o dmapool.o \ attribute_container.o transport_class.o diff --git a/drivers/base/base.h b/drivers/base/base.h index 8d1e8bd4863..645f6269292 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -4,6 +4,8 @@ extern void bus_remove_device(struct device * dev); extern int bus_add_driver(struct device_driver *); extern void bus_remove_driver(struct device_driver *); +extern void driver_detach(struct device_driver * drv); + static inline struct class_device *to_class_dev(struct kobject *obj) { return container_of(obj, struct class_device, kobj); diff --git a/drivers/base/bus.c b/drivers/base/bus.c index aa27f76d28c..1b05c1399e3 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -18,7 +18,6 @@ #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) @@ -243,181 +242,6 @@ int bus_for_each_drv(struct bus_type * bus, struct device_driver * start, 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) -{ - int error = 0; - - if (drv->bus->match && !drv->bus->match(dev, drv)) - return -ENODEV; - - down(&dev->sem); - dev->driver = drv; - if (drv->probe) { - error = drv->probe(dev); - if (error) { - dev->driver = NULL; - up(&dev->sem); - return error; - } - } - up(&dev->sem); - 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; - - down(&dev->sem); - 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); - if (drv->remove) - drv->remove(dev); - dev->driver = NULL; - } - up(&dev->sem); -} - - -/** - * driver_detach - detach driver from all devices it controls. - * @drv: driver. - */ - -static void driver_detach(struct device_driver * drv) -{ - while (!list_empty(&drv->devices)) { - struct device * dev = container_of(drv->devices.next, struct device, driver_list); - device_release_driver(dev); - } -} - static int device_add_attrs(struct bus_type * bus, struct device * dev) { int error = 0; @@ -757,12 +581,6 @@ int __init buses_init(void) 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); diff --git a/drivers/base/dd.c b/drivers/base/dd.c new file mode 100644 index 00000000000..b709b1e0cb2 --- /dev/null +++ b/drivers/base/dd.c @@ -0,0 +1,200 @@ +/* + * drivers/base/dd.c - The core device/driver interactions. + * + * This file contains the (sometimes tricky) code that controls the + * interactions between devices and drivers, which primarily includes + * driver binding and unbinding. + * + * All of this code used to exist in drivers/base/bus.c, but was + * relocated to here in the name of compartmentalization (since it wasn't + * strictly code just for the 'struct bus_type'. + * + * Copyright (c) 2002-5 Patrick Mochel + * Copyright (c) 2002-3 Open Source Development Labs + * + * This file is released under the GPLv2 + */ + +#include +#include + +#include "base.h" +#include "power/power.h" + +#define to_drv(node) container_of(node, struct device_driver, kobj.entry) + + +/** + * 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) +{ + int error = 0; + + if (drv->bus->match && !drv->bus->match(dev, drv)) + return -ENODEV; + + down(&dev->sem); + dev->driver = drv; + if (drv->probe) { + error = drv->probe(dev); + if (error) { + dev->driver = NULL; + up(&dev->sem); + return error; + } + } + up(&dev->sem); + 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; + + down(&dev->sem); + 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); + if (drv->remove) + drv->remove(dev); + dev->driver = NULL; + } + up(&dev->sem); +} + +/** + * driver_detach - detach driver from all devices it controls. + * @drv: driver. + */ +void driver_detach(struct device_driver * drv) +{ + while (!list_empty(&drv->devices)) { + struct device * dev = container_of(drv->devices.next, struct device, driver_list); + device_release_driver(dev); + } +} + + +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); + -- 2.20.1