drivers/base/dd.c

3  * drivers/base/dd.c - The core device/driver interactions.
7  * driver binding and unbinding.
38  * Sometimes driver probe order matters, but the kernel doesn't always have
40  * resource it depends on is available.  For example, an SDHCI driver may
42  * initialized.  If a required resource is not available yet, a driver can
46  * list.  A driver returning -EPROBE_DEFER causes the device to be added to the
47  * pending list.  A successful driver probe will trigger moving all devices
162  * should be called anytime a driver is successfully bound to a device.
171  * trigger has occurred in the midst of probing a driver. If the trigger count
291 		dev_warn(dev, "ignoring dependency for device, assuming no driver\n");
384  * device_is_bound() - Check if device is bound to a driver
388  * against a driver.
404 	dev_dbg(dev, "driver: '%s': %s: bound to device\n", dev->driver->name,
407 	klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices);
427 	dev->driver->coredump(dev);
440 	ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj,
445 	ret = sysfs_create_link(&dev->kobj, &dev->driver->p->kobj,
446 				"driver");
450 	if (!IS_ENABLED(CONFIG_DEV_COREDUMP) || !dev->driver->coredump)
457 	sysfs_remove_link(&dev->kobj, "driver");
460 	sysfs_remove_link(&dev->driver->p->kobj,
469 	struct device_driver *drv = dev->driver;
475 		sysfs_remove_link(&dev->kobj, "driver");
480  * device_bind_driver - bind a driver to one device.
483  * Allow manual attachment of a driver to a device.
484  * Caller must have already set @dev->driver.
488  * (It is ok to call with no other effort from a driver's probe() method.)
552 	dev->driver = NULL;
563 	device_remove_groups(dev, dev->driver->dev_groups);
567 	else if (dev->driver->remove)
568 		dev->driver->remove(dev);
589 		dev_dbg(dev, "probe with driver %s rejects match %d\n",
593 		/* driver matched but the probe failed */
594 		dev_err(dev, "probe with driver %s failed with error %d\n",
622 	dev_dbg(dev, "bus: '%s': %s: probing driver %s with device\n",
631 	dev->driver = drv;
661 		 * suppliers have probed. So, treat this as if the driver
707 	dev_dbg(dev, "bus: '%s': %s: bound device to driver %s\n",
728  * For initcall_debug, show the driver probe time.
783 	if (dev->driver)
787 	dev_dbg(dev, "bus: '%s': %s: matched device with driver %s\n",
809  * driver_probe_device - attempt to bind device & driver together
810  * @drv: driver to bind a device to
811  * @dev: device to try to bind to the driver
814  * already has a driver, 0 if the device is bound successfully and a positive
820  * If the device has a parent, runtime-resume the parent before driver probing.
857 		pr_warn("Too long list of driver names for 'driver_async_probe'!\n");
891 	 * not. Only initial binding after device or driver registration
903 	 * most likely because there was no driver requiring synchronous
904 	 * probing - and we found asynchronous driver during first pass).
906 	 * probe for given device and driver from bus_for_each_drv() since
907 	 * driver pointer is not guaranteed to stay valid once
908 	 * bus_for_each_drv() iterates to the next driver on the bus.
914 	 * driver, we'll encounter one that requests asynchronous probing.
935 		 * Device can't match with a driver right now, so don't attempt
953 	 * Ignore errors returned by ->probe so that the next driver can try
975 	 * happen with driver loading, device discovery/registration,
979 	if (dev->p->dead || dev->driver)
1006 	} else if (dev->driver) {
1015 			dev->driver = NULL;
1032 			 * If we could not find appropriate driver
1056  * device_attach - try to attach device to a driver.
1063  * Returns 1 if the device was bound to a driver;
1064  * 0 if no matching driver was found;
1082  * @dev: Device we will update driver info for
1098  * @dev: Device we will update driver info for
1113  * device_driver_attach - attach a specific driver to a specific device
1117  * Manually attach driver to a device. Will acquire both @dev lock and
1149 	dev_dbg(dev, "driver %s async attach completed: %d\n", drv->name, ret);
1198 		 * that the dev->driver and async_driver fields are protected
1200 		dev_dbg(dev, "probing driver %s asynchronously\n", drv->name);
1202 		if (!dev->driver && !dev->p->async_driver) {
1221  * driver_attach - try to bind driver to devices.
1222  * @drv: driver.
1225  * match the driver with each one.  If driver_probe_device()
1226  * returns 0 and the @dev->driver is set, we've found a
1243 	drv = dev->driver;
1255 			 * have released the driver successfully while this one
1258 			if (dev->driver != drv) {
1292 	if (!drv || drv == dev->driver)
1299  * device_release_driver - manually detach device from driver.
1302  * Manually detach device from driver.
1321  * device_driver_detach - detach driver from a specific device
1322  * @dev: device to detach driver from
1324  * Detach driver from device. Will acquire both @dev lock and @dev->parent
1333  * driver_detach - detach driver from all devices it controls.
1334  * @drv: driver.