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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205// SPDX-License-Identifier: GPL-2.0/* * driver.c - centralized device driver management * * Copyright (c) 2002-3 Patrick Mochel * Copyright (c) 2002-3 Open Source Development Labs * Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de> * Copyright (c) 2007 Novell Inc. */
#include <linux/device/driver.h>#include <linux/device.h>#include <linux/module.h>#include <linux/errno.h>#include <linux/slab.h>#include <linux/string.h>#include <linux/sysfs.h>#include "base.h"
static struct device *next_device(struct klist_iter *i){ struct klist_node *n = klist_next(i); struct device *dev = NULL; struct device_private *dev_prv;
if (n) { dev_prv = to_device_private_driver(n); dev = dev_prv->device; } return dev;}
/** * driver_for_each_device - Iterator for devices bound to a driver. * @drv: Driver we're iterating. * @start: Device to begin with * @data: Data to pass to the callback. * @fn: Function to call for each device. * * Iterate over the @drv's list of devices calling @fn for each one. */int driver_for_each_device(struct device_driver *drv, struct device *start, void *data, device_iter_t fn){ struct klist_iter i; struct device *dev; int error = 0;
if (!drv) return -EINVAL;
klist_iter_init_node(&drv->p->klist_devices, &i, start ? &start->p->knode_driver : NULL); while (!error && (dev = next_device(&i))) error = fn(dev, data); klist_iter_exit(&i); return error;}EXPORT_SYMBOL_GPL(driver_for_each_device);
/** * driver_find_device - device iterator for locating a particular device. * @drv: The device's driver * @start: Device to begin with * @data: Data to pass to match function * @match: Callback function to check device * * This is similar to the driver_for_each_device() function above, but * it returns a reference to a device that is 'found' for later use, as * determined by the @match callback. * * The callback should return 0 if the device doesn't match and non-zero * if it does. If the callback returns non-zero, this function will * return to the caller and not iterate over any more devices. */struct device *driver_find_device(const struct device_driver *drv, struct device *start, const void *data, device_match_t match){ struct klist_iter i; struct device *dev;
if (!drv || !drv->p) return NULL;
klist_iter_init_node(&drv->p->klist_devices, &i, (start ? &start->p->knode_driver : NULL)); while ((dev = next_device(&i))) { if (match(dev, data)) { get_device(dev); break; } } klist_iter_exit(&i); return dev;}EXPORT_SYMBOL_GPL(driver_find_device);
/** * driver_create_file - create sysfs file for driver. * @drv: driver. * @attr: driver attribute descriptor. */int driver_create_file(const struct device_driver *drv, const struct driver_attribute *attr){ int error;
if (drv) error = sysfs_create_file(&drv->p->kobj, &attr->attr); else error = -EINVAL; return error;}EXPORT_SYMBOL_GPL(driver_create_file);
/** * driver_remove_file - remove sysfs file for driver. * @drv: driver. * @attr: driver attribute descriptor. */void driver_remove_file(const struct device_driver *drv, const struct driver_attribute *attr){ if (drv) sysfs_remove_file(&drv->p->kobj, &attr->attr);}EXPORT_SYMBOL_GPL(driver_remove_file);
int driver_add_groups(const struct device_driver *drv, const struct attribute_group *const *groups){ return sysfs_create_groups(&drv->p->kobj, groups);}
void driver_remove_groups(const struct device_driver *drv, const struct attribute_group *const *groups){ sysfs_remove_groups(&drv->p->kobj, groups);}
/** * driver_register - register driver with bus * @drv: driver to register * * We pass off most of the work to the bus_add_driver() call, * since most of the things we have to do deal with the bus * structures. */int driver_register(struct device_driver *drv){ int ret; struct device_driver *other;
if (!bus_is_registered(drv->bus)) { pr_err("Driver '%s' was unable to register with bus_type '%s' because the bus was not initialized.\n", drv->name, drv->bus->name); return -EINVAL; }
if ((drv->bus->probe && drv->probe) || (drv->bus->remove && drv->remove) || (drv->bus->shutdown && drv->shutdown)) pr_warn("Driver '%s' needs updating - please use " "bus_type methods\n", drv->name);
other = driver_find(drv->name, drv->bus); if (other) { pr_err("Error: Driver '%s' is already registered, " "aborting...\n", drv->name); return -EBUSY; }
ret = bus_add_driver(drv); if (ret) return ret; ret = driver_add_groups(drv, drv->groups); if (ret) { bus_remove_driver(drv); return ret; } kobject_uevent(&drv->p->kobj, KOBJ_ADD); deferred_probe_extend_timeout();
return ret;}EXPORT_SYMBOL_GPL(driver_register);
/** * driver_unregister - remove driver from system. * @drv: driver. * * Again, we pass off most of the work to the bus-level call. */void driver_unregister(struct device_driver *drv){ if (!drv || !drv->p) { WARN(1, "Unexpected driver unregister!\n"); return; } driver_remove_groups(drv, drv->groups); bus_remove_driver(drv);}EXPORT_SYMBOL_GPL(driver_unregister);