cregit-Linux how code gets into the kernel

Release 4.14 drivers/base/driver.c

Directory: drivers/base
/*
 * 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.
 *
 * This file is released under the GPLv2
 *
 */

#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; }

Contributors

PersonTokensPropCommitsCommitProp
Greg Kroah-Hartman3052.63%266.67%
Patrick Mochel2747.37%133.33%
Total57100.00%3100.00%

/** * 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, int (*fn)(struct device *, void *)) { 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 ((dev = next_device(&i)) && !error) error = fn(dev, data); klist_iter_exit(&i); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick Mochel10996.46%250.00%
Greg Kroah-Hartman43.54%250.00%
Total113100.00%4100.00%

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(struct device_driver *drv, struct device *start, void *data, int (*match)(struct device *dev, void *data)) { 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; }

Contributors

PersonTokensPropCommitsCommitProp
Cornelia Huck10990.08%116.67%
Greg Kroah-Hartman75.79%466.67%
Hiroshi Doyu54.13%116.67%
Total121100.00%6100.00%

EXPORT_SYMBOL_GPL(driver_find_device); /** * driver_create_file - create sysfs file for driver. * @drv: driver. * @attr: driver attribute descriptor. */
int driver_create_file(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; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick Mochel4693.88%133.33%
Greg Kroah-Hartman24.08%133.33%
Phil Carmody12.04%133.33%
Total49100.00%3100.00%

EXPORT_SYMBOL_GPL(driver_create_file); /** * driver_remove_file - remove sysfs file for driver. * @drv: driver. * @attr: driver attribute descriptor. */
void driver_remove_file(struct device_driver *drv, const struct driver_attribute *attr) { if (drv) sysfs_remove_file(&drv->p->kobj, &attr->attr); }

Contributors

PersonTokensPropCommitsCommitProp
Patrick Mochel3291.43%133.33%
Greg Kroah-Hartman25.71%133.33%
Phil Carmody12.86%133.33%
Total35100.00%3100.00%

EXPORT_SYMBOL_GPL(driver_remove_file);
int driver_add_groups(struct device_driver *drv, const struct attribute_group **groups) { return sysfs_create_groups(&drv->p->kobj, groups); }

Contributors

PersonTokensPropCommitsCommitProp
Cornelia Huck2583.33%125.00%
Greg Kroah-Hartman413.33%250.00%
David Brownell13.33%125.00%
Total30100.00%4100.00%


void driver_remove_groups(struct device_driver *drv, const struct attribute_group **groups) { sysfs_remove_groups(&drv->p->kobj, groups); }

Contributors

PersonTokensPropCommitsCommitProp
Cornelia Huck2586.21%125.00%
Greg Kroah-Hartman310.34%250.00%
David Brownell13.45%125.00%
Total29100.00%4100.00%

/** * 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; BUG_ON(!drv->bus->p); if ((drv->bus->probe && drv->probe) || (drv->bus->remove && drv->remove) || (drv->bus->shutdown && drv->shutdown)) printk(KERN_WARNING "Driver '%s' needs updating - please use " "bus_type methods\n", drv->name); other = driver_find(drv->name, drv->bus); if (other) { printk(KERN_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); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Russell King4728.48%18.33%
Stas Sergeev3923.64%216.67%
Cornelia Huck3521.21%18.33%
Sebastian Ott1710.30%216.67%
Patrick Mochel159.09%433.33%
Dave Young106.06%18.33%
Greg Kroah-Hartman21.21%18.33%
Total165100.00%12100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Kay Sievers2045.45%120.00%
Patrick Mochel1534.09%360.00%
Cornelia Huck920.45%120.00%
Total44100.00%5100.00%

EXPORT_SYMBOL_GPL(driver_unregister); /** * driver_find - locate driver on a bus by its name. * @name: name of the driver. * @bus: bus to scan for the driver. * * Call kset_find_obj() to iterate over list of drivers on * a bus to find driver by name. Return driver if found. * * This routine provides no locking to prevent the driver it returns * from being unregistered or unloaded while the caller is using it. * The caller is responsible for preventing this. */
struct device_driver *driver_find(const char *name, struct bus_type *bus) { struct kobject *k = kset_find_obj(bus->p->drivers_kset, name); struct driver_private *priv; if (k) { /* Drop reference added by kset_find_obj() */ kobject_put(k); priv = to_driver(k); return priv->driver; } return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov4163.08%120.00%
Greg Kroah-Hartman1827.69%360.00%
Alan Stern69.23%120.00%
Total65100.00%5100.00%

EXPORT_SYMBOL_GPL(driver_find);

Overall Contributors

PersonTokensPropCommitsCommitProp
Patrick Mochel25933.55%924.32%
Cornelia Huck20826.94%25.41%
Greg Kroah-Hartman10413.47%1129.73%
Russell King476.09%12.70%
Dmitry Torokhov455.83%12.70%
Stas Sergeev395.05%25.41%
Kay Sievers202.59%12.70%
Sebastian Ott172.20%25.41%
Dave Young101.30%12.70%
Alan Stern70.91%12.70%
Hiroshi Doyu50.65%12.70%
Matthew Wilcox30.39%12.70%
Tejun Heo30.39%12.70%
David Brownell20.26%12.70%
Phil Carmody20.26%12.70%
Randy Dunlap10.13%12.70%
Total772100.00%37100.00%
Directory: drivers/base
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