This patch adds the file configfs.c to the driver directory. The file
registers the necessary subsystems with configfs in order to move the
driver configuration from sysfs to configfs.
Signed-off-by: Christian Gromm <christian.gromm@xxxxxxxxxxxxx>
---
v2:
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
- remove unnecessary variable init
- replace strcmp w/ sysfs_streq
- prefer snprintf over sprintf
- fix array size
- remove empty exit function
- use bool type for create attributes and kstrtobool function
- remove redundant local variables
- remove inline keyword
- remove check for NULL pointers for struct config_item
v3:
- invert sysfs_streq return value evaluation
v4:
- merged with patch 13/14 of v3 series
drivers/staging/most/configfs.c | 627 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 627 insertions(+)
create mode 100644 drivers/staging/most/configfs.c
diff --git a/drivers/staging/most/configfs.c b/drivers/staging/most/configfs.c
new file mode 100644
index 0000000..46bf64d
--- /dev/null
+++ b/drivers/staging/most/configfs.c
@@ -0,0 +1,627 @@
+// 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 <most/core.h>
+
+struct mdev_link {
+ struct config_item item;
+ bool create_link;
+ u16 num_buffers;
+ u16 buffer_size;
+ u16 subbuffer_size;
+ u16 packets_per_xact;
+ u16 dbr_size;
+ char datatype[PAGE_SIZE];
+ char direction[PAGE_SIZE];
+ char name[PAGE_SIZE];
+ char device[PAGE_SIZE];
+ char channel[PAGE_SIZE];
+ char comp[PAGE_SIZE];
+ char comp_params[PAGE_SIZE];
+};
+
+static int set_cfg_buffer_size(struct mdev_link *link)
+{
+ if (!link->buffer_size)
+ return -ENODATA;
+ return most_set_cfg_buffer_size(link->device, link->channel,
+ link->buffer_size);
+}
+
+static int set_cfg_subbuffer_size(struct mdev_link *link)
+{
+ if (!link->subbuffer_size)
+ return -ENODATA;
+ return most_set_cfg_subbuffer_size(link->device, link->channel,
+ link->subbuffer_size);
+}
+
+static int set_cfg_dbr_size(struct mdev_link *link)
+{
+ if (!link->dbr_size)
+ return -ENODATA;
+ return most_set_cfg_dbr_size(link->device, link->channel,
+ link->dbr_size);
+}
+
+static int set_cfg_num_buffers(struct mdev_link *link)
+{
+ if (!link->num_buffers)
+ return -ENODATA;
+ return most_set_cfg_num_buffers(link->device, link->channel,
+ link->num_buffers);
+}
+
+static int set_cfg_packets_xact(struct mdev_link *link)
+{
+ if (!link->packets_per_xact)
+ return -ENODATA;
+ return most_set_cfg_packets_xact(link->device, link->channel,
+ link->packets_per_xact);
+}
+
+static int set_cfg_direction(struct mdev_link *link)
+{
+ if (!strlen(link->direction))
+ return -ENODATA;
+ return most_set_cfg_direction(link->device, link->channel,
+ link->direction);
+}
+
+static int set_cfg_datatype(struct mdev_link *link)
+{
+ if (!strlen(link->datatype))
+ return -ENODATA;
+ 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 ssize_t mdev_link_create_link_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ to_mdev_link(item)->create_link);
+}
+
+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;
+ int i;
+
+ ret = kstrtobool(page, &tmp);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(set_config_val); i++) {
+ ret = set_config_val[i](mdev_link);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (tmp)
+ ret = most_add_link(mdev_link->device, mdev_link->channel,
+ mdev_link->comp, mdev_link->name,
+ mdev_link->comp_params);
+ else
+ ret = most_remove_link(mdev_link->device, mdev_link->channel,
+ mdev_link->comp);
+ if (ret)
+ return ret;
+ mdev_link->create_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);
+ 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);
+ 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);
+
+ strcpy(mdev_link->device, page);
+ 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);
+
+ strcpy(mdev_link->channel, page);
+ 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);
+
+ strcpy(mdev_link->comp, page);
+ 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);
+
+ strcpy(mdev_link->comp_params, page);
+ 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(mdev_link_, create_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_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)
+{
+ 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;
+};
+
+static struct most_common *to_most_common(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct most_common, group);
+}
+
+static struct config_item *most_common_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);
+
+ 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)
+{
+ kfree(to_most_common(item));
+}
+
+static struct configfs_item_operations most_common_item_ops = {
+ .release = most_common_release,
+};
+
+static struct configfs_group_operations most_common_group_ops = {
+ .make_item = most_common_make_item,
+};
+
+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 configfs_subsystem most_cdev_subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "most_cdev",
+ .ci_type = &most_common_type,
+ },
+ },
+};
+
+static struct configfs_subsystem most_net_subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "most_net",
+ .ci_type = &most_common_type,
+ },
+ },
+};
+
+static struct configfs_subsystem 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 = 0;
+ strcpy(mdev_link->name, name);
+ strcpy(mdev_link->comp, "sound");
+ return &mdev_link->item;
+}
+
+static ssize_t most_snd_grp_create_card_show(struct config_item *item,
+ char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ to_most_snd_grp(item)->create_card);
+}
+
+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(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;
+};
+
+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(to_configfs_subsystem(group),
+ 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);
+ }
+ }
+ most = kzalloc(sizeof(*most), GFP_KERNEL);
+ if (!most)
+ 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 struct configfs_group_operations most_sound_group_ops = {
+ .make_group = most_sound_make_group,
+};
+
+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 core_component *c)
+{
+ int ret;
+
+ if (!strcmp(c->name, "cdev"))
+ ret = configfs_register_subsystem(&most_cdev_subsys);
+ else if (!strcmp(c->name, "net"))
+ ret = configfs_register_subsystem(&most_net_subsys);
+ else if (!strcmp(c->name, "video"))
+ ret = configfs_register_subsystem(&most_video_subsys);
+ else if (!strcmp(c->name, "sound"))
+ 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_deregister_configfs_subsys(struct core_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);
+
+ return 0;
+}
--
2.7.4
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