// SPDX-License-Identifier: GPL-2.0 /* * configfs.c - Implementation of configfs interface to the driver stack * * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/configfs.h> #include <linux/most.h> #define MAX_STRING_SIZE 80 struct mdev_link { struct config_item item; struct list_head list; bool create_link; bool destroy_link; u16 num_buffers; u16 buffer_size; u16 subbuffer_size; u16 packets_per_xact; u16 dbr_size; char datatype[MAX_STRING_SIZE]; char direction[MAX_STRING_SIZE]; char name[MAX_STRING_SIZE]; char device[MAX_STRING_SIZE]; char channel[MAX_STRING_SIZE]; char comp[MAX_STRING_SIZE]; char comp_params[MAX_STRING_SIZE]; }; static struct list_head mdev_link_list; static int set_cfg_buffer_size(struct mdev_link *link) { return most_set_cfg_buffer_size(link->device, link->channel, link->buffer_size); } static int set_cfg_subbuffer_size(struct mdev_link *link) { return most_set_cfg_subbuffer_size(link->device, link->channel, link->subbuffer_size); } static int set_cfg_dbr_size(struct mdev_link *link) { return most_set_cfg_dbr_size(link->device, link->channel, link->dbr_size); } static int set_cfg_num_buffers(struct mdev_link *link) { return most_set_cfg_num_buffers(link->device, link->channel, link->num_buffers); } static int set_cfg_packets_xact(struct mdev_link *link) { return most_set_cfg_packets_xact(link->device, link->channel, link->packets_per_xact); } static int set_cfg_direction(struct mdev_link *link) { return most_set_cfg_direction(link->device, link->channel, link->direction); } static int set_cfg_datatype(struct mdev_link *link) { return most_set_cfg_datatype(link->device, link->channel, link->datatype); } static int (*set_config_val[])(struct mdev_link *link) = { set_cfg_buffer_size, set_cfg_subbuffer_size, set_cfg_dbr_size, set_cfg_num_buffers, set_cfg_packets_xact, set_cfg_direction, set_cfg_datatype, }; static struct mdev_link *to_mdev_link(struct config_item *item) { return container_of(item, struct mdev_link, item); } static int set_config_and_add_link(struct mdev_link *mdev_link) { int i; int ret; for (i = 0; i < ARRAY_SIZE(set_config_val); i++) { ret = set_config_val[i](mdev_link); if (ret < 0 && ret != -ENODEV) { pr_err("Config failed\n"); return ret; } } return most_add_link(mdev_link->device, mdev_link->channel, mdev_link->comp, mdev_link->name, mdev_link->comp_params); } static ssize_t mdev_link_create_link_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); bool tmp; int ret; ret = kstrtobool(page, &tmp); if (ret) return ret; if (!tmp) return count; ret = set_config_and_add_link(mdev_link); if (ret && ret != -ENODEV) return ret; list_add_tail(&mdev_link->list, &mdev_link_list); mdev_link->create_link = tmp; mdev_link->destroy_link = false; return count; } static ssize_t mdev_link_destroy_link_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); bool tmp; int ret; ret = kstrtobool(page, &tmp); if (ret) return ret; if (!tmp) return count; ret = most_remove_link(mdev_link->device, mdev_link->channel, mdev_link->comp); if (ret) return ret; if (!list_empty(&mdev_link_list)) list_del(&mdev_link->list); mdev_link->destroy_link = tmp; return count; } static ssize_t mdev_link_direction_show(struct config_item *item, char *page) { return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->direction); } static ssize_t mdev_link_direction_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); if (!sysfs_streq(page, "dir_rx") && !sysfs_streq(page, "rx") && !sysfs_streq(page, "dir_tx") && !sysfs_streq(page, "tx")) return -EINVAL; strcpy(mdev_link->direction, page); strim(mdev_link->direction); return count; } static ssize_t mdev_link_datatype_show(struct config_item *item, char *page) { return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->datatype); } static ssize_t mdev_link_datatype_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); if (!sysfs_streq(page, "control") && !sysfs_streq(page, "async") && !sysfs_streq(page, "sync") && !sysfs_streq(page, "isoc") && !sysfs_streq(page, "isoc_avp")) return -EINVAL; strcpy(mdev_link->datatype, page); strim(mdev_link->datatype); return count; } static ssize_t mdev_link_device_show(struct config_item *item, char *page) { return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->device); } static ssize_t mdev_link_device_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); strscpy(mdev_link->device, page, sizeof(mdev_link->device)); strim(mdev_link->device); return count; } static ssize_t mdev_link_channel_show(struct config_item *item, char *page) { return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->channel); } static ssize_t mdev_link_channel_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); strscpy(mdev_link->channel, page, sizeof(mdev_link->channel)); strim(mdev_link->channel); return count; } static ssize_t mdev_link_comp_show(struct config_item *item, char *page) { return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->comp); } static ssize_t mdev_link_comp_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); strscpy(mdev_link->comp, page, sizeof(mdev_link->comp)); strim(mdev_link->comp); return count; } static ssize_t mdev_link_comp_params_show(struct config_item *item, char *page) { return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->comp_params); } static ssize_t mdev_link_comp_params_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); strscpy(mdev_link->comp_params, page, sizeof(mdev_link->comp_params)); strim(mdev_link->comp_params); return count; } static ssize_t mdev_link_num_buffers_show(struct config_item *item, char *page) { return snprintf(page, PAGE_SIZE, "%d\n", to_mdev_link(item)->num_buffers); } static ssize_t mdev_link_num_buffers_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); int ret; ret = kstrtou16(page, 0, &mdev_link->num_buffers); if (ret) return ret; return count; } static ssize_t mdev_link_buffer_size_show(struct config_item *item, char *page) { return snprintf(page, PAGE_SIZE, "%d\n", to_mdev_link(item)->buffer_size); } static ssize_t mdev_link_buffer_size_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); int ret; ret = kstrtou16(page, 0, &mdev_link->buffer_size); if (ret) return ret; return count; } static ssize_t mdev_link_subbuffer_size_show(struct config_item *item, char *page) { return snprintf(page, PAGE_SIZE, "%d\n", to_mdev_link(item)->subbuffer_size); } static ssize_t mdev_link_subbuffer_size_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); int ret; ret = kstrtou16(page, 0, &mdev_link->subbuffer_size); if (ret) return ret; return count; } static ssize_t mdev_link_packets_per_xact_show(struct config_item *item, char *page) { return snprintf(page, PAGE_SIZE, "%d\n", to_mdev_link(item)->packets_per_xact); } static ssize_t mdev_link_packets_per_xact_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); int ret; ret = kstrtou16(page, 0, &mdev_link->packets_per_xact); if (ret) return ret; return count; } static ssize_t mdev_link_dbr_size_show(struct config_item *item, char *page) { return snprintf(page, PAGE_SIZE, "%d\n", to_mdev_link(item)->dbr_size); } static ssize_t mdev_link_dbr_size_store(struct config_item *item, const char *page, size_t count) { struct mdev_link *mdev_link = to_mdev_link(item); int ret; ret = kstrtou16(page, 0, &mdev_link->dbr_size); if (ret) return ret; return count; } CONFIGFS_ATTR_WO(mdev_link_, create_link); CONFIGFS_ATTR_WO(mdev_link_, destroy_link); CONFIGFS_ATTR(mdev_link_, device); CONFIGFS_ATTR(mdev_link_, channel); CONFIGFS_ATTR(mdev_link_, comp); CONFIGFS_ATTR(mdev_link_, comp_params); CONFIGFS_ATTR(mdev_link_, num_buffers); CONFIGFS_ATTR(mdev_link_, buffer_size); CONFIGFS_ATTR(mdev_link_, subbuffer_size); CONFIGFS_ATTR(mdev_link_, packets_per_xact); CONFIGFS_ATTR(mdev_link_, datatype); CONFIGFS_ATTR(mdev_link_, direction); CONFIGFS_ATTR(mdev_link_, dbr_size); static struct configfs_attribute *mdev_link_attrs[] = { &mdev_link_attr_create_link, &mdev_link_attr_destroy_link, &mdev_link_attr_device, &mdev_link_attr_channel, &mdev_link_attr_comp, &mdev_link_attr_comp_params, &mdev_link_attr_num_buffers, &mdev_link_attr_buffer_size, &mdev_link_attr_subbuffer_size, &mdev_link_attr_packets_per_xact, &mdev_link_attr_datatype, &mdev_link_attr_direction, &mdev_link_attr_dbr_size, NULL, }; static void mdev_link_release(struct config_item *item) { struct mdev_link *mdev_link = to_mdev_link(item); int ret; if (mdev_link->destroy_link) goto free_item; ret = most_remove_link(mdev_link->device, mdev_link->channel, mdev_link->comp); if (ret) { pr_err("Removing link failed.\n"); goto free_item; } if (!list_empty(&mdev_link_list)) list_del(&mdev_link->list); free_item: kfree(to_mdev_link(item)); } static struct configfs_item_operations mdev_link_item_ops = { .release = mdev_link_release, }; static const struct config_item_type mdev_link_type = { .ct_item_ops = &mdev_link_item_ops, .ct_attrs = mdev_link_attrs, .ct_owner = THIS_MODULE, }; struct most_common { struct config_group group; struct module *mod; struct configfs_subsystem subsys; }; static struct most_common *to_most_common(struct configfs_subsystem *subsys) { return container_of(subsys, struct most_common, subsys); } static struct config_item *most_common_make_item(struct config_group *group, const char *name) { struct mdev_link *mdev_link; struct most_common *mc = to_most_common(group->cg_subsys); mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL); if (!mdev_link) return ERR_PTR(-ENOMEM); if (!try_module_get(mc->mod)) { kfree(mdev_link); return ERR_PTR(-ENOLCK); } config_item_init_type_name(&mdev_link->item, name, &mdev_link_type); if (!strcmp(group->cg_item.ci_namebuf, "most_cdev")) strcpy(mdev_link->comp, "cdev"); else if (!strcmp(group->cg_item.ci_namebuf, "most_net")) strcpy(mdev_link->comp, "net"); else if (!strcmp(group->cg_item.ci_namebuf, "most_video")) strcpy(mdev_link->comp, "video"); strcpy(mdev_link->name, name); return &mdev_link->item; } static void most_common_release(struct config_item *item) { struct config_group *group = to_config_group(item); kfree(to_most_common(group->cg_subsys)); } static struct configfs_item_operations most_common_item_ops = { .release = most_common_release, }; static void most_common_disconnect(struct config_group *group, struct config_item *item) { struct most_common *mc = to_most_common(group->cg_subsys); module_put(mc->mod); } static struct configfs_group_operations most_common_group_ops = { .make_item = most_common_make_item, .disconnect_notify = most_common_disconnect, }; static const struct config_item_type most_common_type = { .ct_item_ops = &most_common_item_ops, .ct_group_ops = &most_common_group_ops, .ct_owner = THIS_MODULE, }; static struct most_common most_cdev = { .subsys = { .su_group = { .cg_item = { .ci_namebuf = "most_cdev", .ci_type = &most_common_type, }, }, }, }; static struct most_common most_net = { .subsys = { .su_group = { .cg_item = { .ci_namebuf = "most_net", .ci_type = &most_common_type, }, }, }, }; static struct most_common most_video = { .subsys = { .su_group = { .cg_item = { .ci_namebuf = "most_video", .ci_type = &most_common_type, }, }, }, }; struct most_snd_grp { struct config_group group; bool create_card; struct list_head list; }; static struct most_snd_grp *to_most_snd_grp(struct config_item *item) { return container_of(to_config_group(item), struct most_snd_grp, group); } static struct config_item *most_snd_grp_make_item(struct config_group *group, const char *name) { struct mdev_link *mdev_link; mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL); if (!mdev_link) return ERR_PTR(-ENOMEM); config_item_init_type_name(&mdev_link->item, name, &mdev_link_type); mdev_link->create_link = false; strcpy(mdev_link->name, name); strcpy(mdev_link->comp, "sound"); return &mdev_link->item; } static ssize_t most_snd_grp_create_card_store(struct config_item *item, const char *page, size_t count) { struct most_snd_grp *snd_grp = to_most_snd_grp(item); int ret; bool tmp; ret = kstrtobool(page, &tmp); if (ret) return ret; if (tmp) { ret = most_cfg_complete("sound"); if (ret) return ret; } snd_grp->create_card = tmp; return count; } CONFIGFS_ATTR_WO(most_snd_grp_, create_card); static struct configfs_attribute *most_snd_grp_attrs[] = { &most_snd_grp_attr_create_card, NULL, }; static void most_snd_grp_release(struct config_item *item) { struct most_snd_grp *group = to_most_snd_grp(item); list_del(&group->list); kfree(group); } static struct configfs_item_operations most_snd_grp_item_ops = { .release = most_snd_grp_release, }; static struct configfs_group_operations most_snd_grp_group_ops = { .make_item = most_snd_grp_make_item, }; static const struct config_item_type most_snd_grp_type = { .ct_item_ops = &most_snd_grp_item_ops, .ct_group_ops = &most_snd_grp_group_ops, .ct_attrs = most_snd_grp_attrs, .ct_owner = THIS_MODULE, }; struct most_sound { struct configfs_subsystem subsys; struct list_head soundcard_list; struct module *mod; }; static struct config_group *most_sound_make_group(struct config_group *group, const char *name) { struct most_snd_grp *most; struct most_sound *ms = container_of(group->cg_subsys, struct most_sound, subsys); list_for_each_entry(most, &ms->soundcard_list, list) { if (!most->create_card) { pr_info("adapter configuration still in progress.\n"); return ERR_PTR(-EPROTO); } } if (!try_module_get(ms->mod)) return ERR_PTR(-ENOLCK); most = kzalloc(sizeof(*most), GFP_KERNEL); if (!most) { module_put(ms->mod); return ERR_PTR(-ENOMEM); } config_group_init_type_name(&most->group, name, &most_snd_grp_type); list_add_tail(&most->list, &ms->soundcard_list); return &most->group; } static void most_sound_disconnect(struct config_group *group, struct config_item *item) { struct most_sound *ms = container_of(group->cg_subsys, struct most_sound, subsys); module_put(ms->mod); } static struct configfs_group_operations most_sound_group_ops = { .make_group = most_sound_make_group, .disconnect_notify = most_sound_disconnect, }; static const struct config_item_type most_sound_type = { .ct_group_ops = &most_sound_group_ops, .ct_owner = THIS_MODULE, }; static struct most_sound most_sound_subsys = { .subsys = { .su_group = { .cg_item = { .ci_namebuf = "most_sound", .ci_type = &most_sound_type, }, }, }, }; int most_register_configfs_subsys(struct most_component *c) { int ret; if (!strcmp(c->name, "cdev")) { most_cdev.mod = c->mod; ret = configfs_register_subsystem(&most_cdev.subsys); } else if (!strcmp(c->name, "net")) { most_net.mod = c->mod; ret = configfs_register_subsystem(&most_net.subsys); } else if (!strcmp(c->name, "video")) { most_video.mod = c->mod; ret = configfs_register_subsystem(&most_video.subsys); } else if (!strcmp(c->name, "sound")) { most_sound_subsys.mod = c->mod; ret = configfs_register_subsystem(&most_sound_subsys.subsys); } else { return -ENODEV; } if (ret) { pr_err("Error %d while registering subsystem %s\n", ret, c->name); } return ret; } EXPORT_SYMBOL_GPL(most_register_configfs_subsys); void most_interface_register_notify(const char *mdev) { bool register_snd_card = false; struct mdev_link *mdev_link; list_for_each_entry(mdev_link, &mdev_link_list, list) { if (!strcmp(mdev_link->device, mdev)) { set_config_and_add_link(mdev_link); if (!strcmp(mdev_link->comp, "sound")) register_snd_card = true; } } if (register_snd_card) most_cfg_complete("sound"); } void most_deregister_configfs_subsys(struct most_component *c) { if (!strcmp(c->name, "cdev")) configfs_unregister_subsystem(&most_cdev.subsys); else if (!strcmp(c->name, "net")) configfs_unregister_subsystem(&most_net.subsys); else if (!strcmp(c->name, "video")) configfs_unregister_subsystem(&most_video.subsys); else if (!strcmp(c->name, "sound")) configfs_unregister_subsystem(&most_sound_subsys.subsys); } EXPORT_SYMBOL_GPL(most_deregister_configfs_subsys); int __init configfs_init(void) { config_group_init(&most_cdev.subsys.su_group); mutex_init(&most_cdev.subsys.su_mutex); config_group_init(&most_net.subsys.su_group); mutex_init(&most_net.subsys.su_mutex); config_group_init(&most_video.subsys.su_group); mutex_init(&most_video.subsys.su_mutex); config_group_init(&most_sound_subsys.subsys.su_group); mutex_init(&most_sound_subsys.subsys.su_mutex); INIT_LIST_HEAD(&most_sound_subsys.soundcard_list); INIT_LIST_HEAD(&mdev_link_list); return 0; }