/* * vim: noexpandtab ts=8 sts=0 sw=8: * * configfs_example_macros.c - This file is a demonstration module * containing a number of configfs subsystems. It uses the helper * macros defined by configfs.h * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. * * Based on sysfs: * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel * * configfs Copyright (C) 2005 Oracle. All rights reserved. */ #include #include #include #include /* * 01-childless * * This first example is a childless subsystem. It cannot create * any config_items. It just has attributes. * * Note that we are enclosing the configfs_subsystem inside a container. * This is not necessary if a subsystem has no attributes directly * on the subsystem. See the next example, 02-simple-children, for * such a subsystem. */ struct childless { struct configfs_subsystem subsys; int showme; int storeme; }; static inline struct childless *to_childless(struct config_item *item) { return item ? container_of(to_configfs_subsystem(to_config_group(item)), struct childless, subsys) : NULL; } static ssize_t childless_showme_show(struct config_item *item, char *page) { struct childless *childless = to_childless(item); ssize_t pos; pos = sprintf(page, "%d\n", childless->showme); childless->showme++; return pos; } static ssize_t childless_storeme_show(struct config_item *item, char *page) { return sprintf(page, "%d\n", to_childless(item)->storeme); } static ssize_t childless_storeme_store(struct config_item *item, const char *page, size_t count) { struct childless *childless = to_childless(item); unsigned long tmp; char *p = (char *) page; tmp = simple_strtoul(p, &p, 10); if (!p || (*p && (*p != '\n'))) return -EINVAL; if (tmp > INT_MAX) return -ERANGE; childless->storeme = tmp; return count; } static ssize_t childless_description_show(struct config_item *item, char *page) { return sprintf(page, "[01-childless]\n" "\n" "The childless subsystem is the simplest possible subsystem in\n" "configfs. It does not support the creation of child config_items.\n" "It only has a few attributes. In fact, it isn't much different\n" "than a directory in /proc.\n"); } CONFIGFS_ATTR_RO(childless_, showme); CONFIGFS_ATTR(childless_, storeme); CONFIGFS_ATTR_RO(childless_, description); static struct configfs_attribute *childless_attrs[] = { &childless_attr_showme, &childless_attr_storeme, &childless_attr_description, NULL, }; static struct config_item_type childless_type = { .ct_attrs = childless_attrs, .ct_owner = THIS_MODULE, }; static struct childless childless_subsys = { .subsys = { .su_group = { .cg_item = { .ci_namebuf = "01-childless", .ci_type = &childless_type, }, }, }, }; /* ----------------------------------------------------------------- */ /* * 02-simple-children * * This example merely has a simple one-attribute child. Note that * there is no extra attribute structure, as the child's attribute is * known from the get-go. Also, there is no container for the * subsystem, as it has no attributes of its own. */ struct simple_child { struct config_item item; int storeme; }; static inline struct simple_child *to_simple_child(struct config_item *item) { return item ? container_of(item, struct simple_child, item) : NULL; } static ssize_t simple_child_storeme_show(struct config_item *item, char *page) { return sprintf(page, "%d\n", to_simple_child(item)->storeme); } static ssize_t simple_child_storeme_store(struct config_item *item, const char *page, size_t count) { struct simple_child *simple_child = to_simple_child(item); unsigned long tmp; char *p = (char *) page; tmp = simple_strtoul(p, &p, 10); if (!p || (*p && (*p != '\n'))) return -EINVAL; if (tmp > INT_MAX) return -ERANGE; simple_child->storeme = tmp; return count; } CONFIGFS_ATTR(simple_child_, storeme); static struct configfs_attribute *simple_child_attrs[] = { &simple_child_attr_storeme, NULL, }; static void simple_child_release(struct config_item *item) { kfree(to_simple_child(item)); } static struct configfs_item_operations simple_child_item_ops = { .release = simple_child_release, }; static struct config_item_type simple_child_type = { .ct_item_ops = &simple_child_item_ops, .ct_attrs = simple_child_attrs, .ct_owner = THIS_MODULE, }; struct simple_children { struct config_group group; }; static inline struct simple_children *to_simple_children(struct config_item *item) { return item ? container_of(to_config_group(item), struct simple_children, group) : NULL; } static struct config_item *simple_children_make_item(struct config_group *group, const char *name) { struct simple_child *simple_child; simple_child = kzalloc(sizeof(struct simple_child), GFP_KERNEL); if (!simple_child) return ERR_PTR(-ENOMEM); config_item_init_type_name(&simple_child->item, name, &simple_child_type); simple_child->storeme = 0; return &simple_child->item; } static ssize_t simple_children_description_show(struct config_item *item, char *page) { return sprintf(page, "[02-simple-children]\n" "\n" "This subsystem allows the creation of child config_items. These\n" "items have only one attribute that is readable and writeable.\n"); } CONFIGFS_ATTR_RO(simple_children_, description); static struct configfs_attribute *simple_children_attrs[] = { &simple_children_attr_description, NULL, }; static void simple_children_release(struct config_item *item) { kfree(to_simple_children(item)); } static struct configfs_item_operations simple_children_item_ops = { .release = simple_children_release, }; /* * Note that, since no extra work is required on ->drop_item(), * no ->drop_item() is provided. */ static struct configfs_group_operations simple_children_group_ops = { .make_item = simple_children_make_item, }; static struct config_item_type simple_children_type = { .ct_item_ops = &simple_children_item_ops, .ct_group_ops = &simple_children_group_ops, .ct_attrs = simple_children_attrs, .ct_owner = THIS_MODULE, }; static struct configfs_subsystem simple_children_subsys = { .su_group = { .cg_item = { .ci_namebuf = "02-simple-children", .ci_type = &simple_children_type, }, }, }; /* ----------------------------------------------------------------- */ /* * 03-group-children * * This example reuses the simple_children group from above. However, * the simple_children group is not the subsystem itself, it is a * child of the subsystem. Creation of a group in the subsystem creates * a new simple_children group. That group can then have simple_child * children of its own. */ static struct config_group *group_children_make_group( struct config_group *group, const char *name) { struct simple_children *simple_children; simple_children = kzalloc(sizeof(struct simple_children), GFP_KERNEL); if (!simple_children) return ERR_PTR(-ENOMEM); config_group_init_type_name(&simple_children->group, name, &simple_children_type); return &simple_children->group; } static ssize_t group_children_description_show(struct config_item *item, char *page) { return sprintf(page, "[03-group-children]\n" "\n" "This subsystem allows the creation of child config_groups. These\n" "groups are like the subsystem simple-children.\n"); } CONFIGFS_ATTR_RO(group_children_, description); static struct configfs_attribute *group_children_attrs[] = { &group_children_attr_description, NULL, }; /* * Note that, since no extra work is required on ->drop_item(), * no ->drop_item() is provided. */ static struct configfs_group_operations group_children_group_ops = { .make_group = group_children_make_group, }; static struct config_item_type group_children_type = { .ct_group_ops = &group_children_group_ops, .ct_attrs = group_children_attrs, .ct_owner = THIS_MODULE, }; static struct configfs_subsystem group_children_subsys = { .su_group = { .cg_item = { .ci_namebuf = "03-group-children", .ci_type = &group_children_type, }, }, }; /* ----------------------------------------------------------------- */ /* * We're now done with our subsystem definitions. * For convenience in this module, here's a list of them all. It * allows the init function to easily register them. Most modules * will only have one subsystem, and will only call register_subsystem * on it directly. */ static struct configfs_subsystem *example_subsys[] = { &childless_subsys.subsys, &simple_children_subsys, &group_children_subsys, NULL, }; static int __init configfs_example_init(void) { int ret; int i; struct configfs_subsystem *subsys; for (i = 0; example_subsys[i]; i++) { subsys = example_subsys[i]; config_group_init(&subsys->su_group); mutex_init(&subsys->su_mutex); ret = configfs_register_subsystem(subsys); if (ret) { printk(KERN_ERR "Error %d while registering subsystem %s\n", ret, subsys->su_group.cg_item.ci_namebuf); goto out_unregister; } } return 0; out_unregister: for (i--; i >= 0; i--) configfs_unregister_subsystem(example_subsys[i]); return ret; } static void __exit configfs_example_exit(void) { int i; for (i = 0; example_subsys[i]; i++) configfs_unregister_subsystem(example_subsys[i]); } module_init(configfs_example_init); module_exit(configfs_example_exit); MODULE_LICENSE("GPL"); tc_helper.h?id=b44700e975848a9a569a509244672ff886ec99b3'>plain -rw-r--r--drm_debugfs_crc.h2670logplain -rw-r--r--drm_displayid.h2850logplain -rw-r--r--drm_dp_dual_mode_helper.h4532logplain -rw-r--r--drm_dp_helper.h30638logplain -rw-r--r--drm_dp_mst_helper.h16260logplain -rw-r--r--drm_drv.h14861logplain -rw-r--r--drm_edid.h14335logplain -rw-r--r--drm_encoder.h8160logplain -rw-r--r--drm_encoder_slave.h6583logplain -rw-r--r--drm_fb_cma_helper.h1929logplain -rw-r--r--drm_fb_helper.h15125logplain -rw-r--r--drm_fixed.h4825logplain -rw-r--r--drm_flip_work.h3071logplain -rw-r--r--drm_fourcc.h2748logplain -rw-r--r--drm_framebuffer.h9623logplain -rw-r--r--drm_gem.h8052logplain -rw-r--r--drm_gem_cma_helper.h2286logplain -rw-r--r--drm_global.h2011logplain -rw-r--r--drm_hashtab.h3139logplain -rw-r--r--drm_irq.h6323logplain -rw-r--r--drm_legacy.h6933logplain -rw-r--r--drm_mem_util.h2468logplain -rw-r--r--drm_mipi_dsi.h10327logplain -rw-r--r--drm_mm.h11462logplain -rw-r--r--drm_mode_config.h23728logplain -rw-r--r--drm_mode_object.h4911logplain -rw-r--r--drm_modes.h17078logplain -rw-r--r--drm_modeset_helper.h1576logplain -rw-r--r--drm_modeset_helper_vtables.h41180logplain -rw-r--r--drm_modeset_lock.h4241logplain -rw-r--r--drm_of.h2034logplain -rw-r--r--drm_os_linux.h2230logplain -rw-r--r--drm_panel.h7079logplain -rw-r--r--drm_pciids.h68035logplain -rw-r--r--drm_plane.h19435logplain -rw-r--r--drm_plane_helper.h3186logplain -rw-r--r--drm_print.h3232logplain -rw-r--r--drm_property.h11460logplain -rw-r--r--drm_rect.h5103logplain -rw-r--r--drm_simple_kms_helper.h4090logplain -rw-r--r--drm_sysfs.h300logplain -rw-r--r--drm_vma_manager.h7840logplain -rw-r--r--gma_drm.h1033logplain d---------i2c109logplain