diff options
Diffstat (limited to 'drivers/most/configfs.c')
| -rw-r--r-- | drivers/most/configfs.c | 724 |
1 files changed, 724 insertions, 0 deletions
diff --git a/drivers/most/configfs.c b/drivers/most/configfs.c new file mode 100644 index 0000000000..36d8c917f6 --- /dev/null +++ b/drivers/most/configfs.c @@ -0,0 +1,724 @@ +// 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; +} |