Add the code that implements the usage of configfs in order
to create and configure a device topology from userspace.
The code is only added in this patch but is not used.
It will be used in next patch in the series.
Signed-off-by: Helen Koike <helen.koike@xxxxxxxxxxxxx>
[refactored for upstream]
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@xxxxxxxxxxxxx>
---
drivers/media/platform/vimc/Kconfig | 2 +-
drivers/media/platform/vimc/Makefile | 2 +-
drivers/media/platform/vimc/vimc-capture.c | 21 +
drivers/media/platform/vimc/vimc-common.h | 64 ++
drivers/media/platform/vimc/vimc-configfs.c | 711 ++++++++++++++++++++
drivers/media/platform/vimc/vimc-configfs.h | 41 ++
drivers/media/platform/vimc/vimc-debayer.c | 22 +
drivers/media/platform/vimc/vimc-scaler.c | 22 +
drivers/media/platform/vimc/vimc-sensor.c | 21 +
9 files changed, 904 insertions(+), 2 deletions(-)
create mode 100644 drivers/media/platform/vimc/vimc-configfs.c
create mode 100644 drivers/media/platform/vimc/vimc-configfs.h
diff --git a/drivers/media/platform/vimc/Kconfig b/drivers/media/platform/vimc/Kconfig
index bd221d3e1a4a..6e292f19e859 100644
--- a/drivers/media/platform/vimc/Kconfig
+++ b/drivers/media/platform/vimc/Kconfig
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
config VIDEO_VIMC
tristate "Virtual Media Controller Driver (VIMC)"
- depends on VIDEO_DEV && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
+ depends on VIDEO_DEV && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API && CONFIGFS_FS
select VIDEOBUF2_VMALLOC
select VIDEO_V4L2_TPG
help
diff --git a/drivers/media/platform/vimc/Makefile b/drivers/media/platform/vimc/Makefile
index a53b2b532e9f..eb03d487f308 100644
--- a/drivers/media/platform/vimc/Makefile
+++ b/drivers/media/platform/vimc/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
vimc-y := vimc-core.o vimc-common.o vimc-streamer.o vimc-capture.o \
- vimc-debayer.o vimc-scaler.o vimc-sensor.o
+ vimc-debayer.o vimc-scaler.o vimc-sensor.o vimc-configfs.o
obj-$(CONFIG_VIDEO_VIMC) += vimc.o
diff --git a/drivers/media/platform/vimc/vimc-capture.c b/drivers/media/platform/vimc/vimc-capture.c
index 6f7bbfc4446d..a0873cb12b62 100644
--- a/drivers/media/platform/vimc/vimc-capture.c
+++ b/drivers/media/platform/vimc/vimc-capture.c
@@ -9,6 +9,7 @@
#include <media/videobuf2-core.h>
#include <media/videobuf2-vmalloc.h>
+#include "vimc-configfs.h"
#include "vimc-common.h"
#include "vimc-streamer.h"
@@ -490,3 +491,23 @@ struct vimc_ent_device *vimc_cap_add(struct vimc_device *vimc,
return NULL;
}
+
+static void vimc_cap_create_cfs_pads(struct config_group *ent_group)
+{
+ vimc_cfs_add_sink_pad(ent_group, 0, VIMC_CFS_SINK_PAD_NUM(0));
+}
+
+struct vimc_cfs_ent_type vimc_cap_cfs_ent_type = {
+ .name = VIMC_CAP_NAME,
+ .create_pads = vimc_cap_create_cfs_pads,
+};
+
+void vimc_cap_exit(void)
+{
+ vimc_cfs_ent_type_unregister(&vimc_cap_cfs_ent_type);
+}
+
+void vimc_cap_init(void)
+{
+ vimc_cfs_ent_type_register(&vimc_cap_cfs_ent_type);
+}
diff --git a/drivers/media/platform/vimc/vimc-common.h b/drivers/media/platform/vimc/vimc-common.h
index 1c41ebb77420..d677b0d1c990 100644
--- a/drivers/media/platform/vimc/vimc-common.h
+++ b/drivers/media/platform/vimc/vimc-common.h
@@ -14,6 +14,7 @@
#include <media/v4l2-device.h>
#define VIMC_PDEV_NAME "vimc"
+#define VIMC_MAX_NAME_LEN V4L2_SUBDEV_NAME_SIZE
/* VIMC-specific controls */
#define VIMC_CID_VIMC_BASE (0x00f00000 | 0xf000)
@@ -32,6 +33,11 @@
#define VIMC_IS_SRC(pad) (pad)
#define VIMC_IS_SINK(pad) (!(pad))
+#define VIMC_DEB_NAME "vimc-debayer"
+#define VIMC_SEN_NAME "vimc-sensor"
+#define VIMC_SCA_NAME "vimc-scaler"
+#define VIMC_CAP_NAME "vimc-capture"
+
/**
* struct vimc_colorimetry_clamp - Adjust colorimetry parameters
*
@@ -58,6 +64,20 @@ do { \
(fmt)->xfer_func = V4L2_XFER_FUNC_DEFAULT; \
} while (0)
+/**
+ * struct vimc_platform_data - platform data to the core
+ *
+ * @topology_mutex: mutex to sync the access to the topology
+ * @ents: list of vimc_entity_data objects allocated by the configfs
+ * @links: list of vimc_link_data objects allocated by the configfs
+ *
+ */
+struct vimc_platform_data {
+ struct mutex topology_mutex;
+ struct list_head ents;
+ struct list_head links;
+};
+
/**
* struct vimc_pix_map - maps media bus code with v4l2 pixel format
*
@@ -75,6 +95,42 @@ struct vimc_pix_map {
bool bayer;
};
+/**
+ * struct vimc_entity_data - a struct contating data about the entity
+ * the data is given from userspace using configfs
+ *
+ * @name: the name of the entity
+ * @type_name: the type of the entity
+ * @entry: the entry in the list 'ents' in the vimc_platform_data
+ *
+ */
+struct vimc_entity_data {
+ char name[VIMC_MAX_NAME_LEN];
+ const char *type_name;
+ struct list_head entry;
+};
+
+/**
+ * struct vimc_link_data - a struct containing data about the link
+ * the data is given from userspace using configfs
+ *
+ * @source: the source of the link
+ * @sink: the sink of the link
+ * @source_pad: the source pad of the link
+ * @sink_pad: the sink pad of the link
+ * @flags: the flags of the link
+ * @entry: the entry in the list 'links' in the vimc_platform_data
+ *
+ */
+struct vimc_link_data {
+ struct vimc_entity_data *source;
+ struct vimc_entity_data *sink;
+ u16 source_pad;
+ u16 sink_pad;
+ u32 flags;
+ struct list_head entry;
+};
+
/**
* struct vimc_ent_device - core struct that represents an entity in the
* topology
@@ -153,18 +209,26 @@ bool vimc_is_source(struct media_entity *ent);
struct vimc_ent_device *vimc_cap_add(struct vimc_device *vimc,
const char *vcfg_name);
void vimc_cap_rm(struct vimc_device *vimc, struct vimc_ent_device *ved);
+void vimc_cap_init(void);
+void vimc_cap_exit(void);
struct vimc_ent_device *vimc_deb_add(struct vimc_device *vimc,
const char *vcfg_name);
void vimc_deb_rm(struct vimc_device *vimc, struct vimc_ent_device *ved);
+void vimc_deb_init(void);
+void vimc_deb_exit(void);
struct vimc_ent_device *vimc_sca_add(struct vimc_device *vimc,
const char *vcfg_name);
void vimc_sca_rm(struct vimc_device *vimc, struct vimc_ent_device *ved);
+void vimc_sca_init(void);
+void vimc_sca_exit(void);
struct vimc_ent_device *vimc_sen_add(struct vimc_device *vimc,
const char *vcfg_name);
void vimc_sen_rm(struct vimc_device *vimc, struct vimc_ent_device *ved);
+void vimc_sen_init(void);
+void vimc_sen_exit(void);
/**
* vimc_pix_map_by_index - get vimc_pix_map struct by its index
diff --git a/drivers/media/platform/vimc/vimc-configfs.c b/drivers/media/platform/vimc/vimc-configfs.c
new file mode 100644
index 000000000000..f7372de33de2
--- /dev/null
+++ b/drivers/media/platform/vimc/vimc-configfs.c
@@ -0,0 +1,711 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * vimc-configfs.c Virtual Media Controller Driver
+ *
+ * Copyright (C) 2018 Helen Koike <helen.koike@xxxxxxxxxxxxx>
+ */
+
+#include <linux/platform_device.h>
+
+#include "vimc-common.h"
+#include "vimc-configfs.h"
+
+#define CHAR_SEPARATOR ':'
+#define CFS_SUBSYS_NAME "vimc"
+#define MAX_PAD_DIGI_NUM 4
+
+#define ci_err(ci, fmt, ...) \
+ pr_err("vimc: %s: " pr_fmt(fmt), (ci)->ci_name, ##__VA_ARGS__)
+#define cg_err(cg, ...) ci_err(&(cg)->cg_item, ##__VA_ARGS__)
+#define ci_warn(ci, fmt, ...) \
+ pr_warn("vimc: %s: " pr_fmt(fmt), (ci)->ci_name, ##__VA_ARGS__)
+#define cg_warn(cg, ...) ci_warn(&(cg)->cg_item, ##__VA_ARGS__)
+#define ci_dbg(ci, fmt, ...) \
+ pr_debug("vimc: %s: %s:" pr_fmt(fmt), (ci)->ci_name, __func__, ##__VA_ARGS__)
+#define cg_dbg(cg, ...) ci_dbg(&(cg)->cg_item, ##__VA_ARGS__)
+
+#define IS_PLUGGED(cfs) (!!(cfs)->pdev)
+#define VIMC_MAX_CFS_NAME_LEN (VIMC_MAX_NAME_LEN * 2 + 1)
+
+/*
+ * currently there is no entity with more than two pads, this will
+ * change when adding the splitter entity
+ */
+#define VIMC_ENT_MAX_PADS 2
+
+enum vimc_cfs_hotplug_state {
+ VIMC_CFS_HOTPLUG_STATE_UNPLUGGED = 0,
+ VIMC_CFS_HOTPLUG_STATE_PLUGGED = 1,
+};
+
+const static char *vimc_cfs_hotplug_values[2][3] = {
+ [VIMC_CFS_HOTPLUG_STATE_UNPLUGGED] = {"unplugged\n", "unplug\n", "0\n"},
+ [VIMC_CFS_HOTPLUG_STATE_PLUGGED] = {"plugged\n", "plug\n", "1\n"},
+};
+
+static void vimc_cfs_subsys_drop_dev_item(struct config_group *group,
+ struct config_item *item);
+static struct config_group *vimc_cfs_subsys_make_dev_group(
+ struct config_group *group, const char *name);
+
+static struct configfs_group_operations vimc_cfs_subsys_group_ops = {
+ .make_group = vimc_cfs_subsys_make_dev_group,
+ .drop_item = vimc_cfs_subsys_drop_dev_item,
+};
+
+static struct config_item_type vimc_cfs_subsys_type = {
+ .ct_group_ops = &vimc_cfs_subsys_group_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct vimc_cfs_subsystem {
+ struct configfs_subsystem subsys;
+ struct list_head ent_types;
+} vimc_cfs_subsys = {
+ .subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = CFS_SUBSYS_NAME,
+ .ci_type = &vimc_cfs_subsys_type,
+ },
+ },
+ .su_mutex = __MUTEX_INITIALIZER(vimc_cfs_subsys.subsys.su_mutex),
+ },
+ .ent_types = LIST_HEAD_INIT(vimc_cfs_subsys.ent_types),
+};
+
+/* Structure of a vimc device in configfs */
+struct vimc_cfs_device {
+ struct mutex pdev_mutex;
+ struct platform_device *pdev;
+ struct vimc_platform_data pdata;
+ struct config_group gdev;
+};
+
+/* Structure of for entity in configfs */
+struct vimc_cfs_ent {
+ struct vimc_entity_data ent;
+ struct config_group cg;
+ struct config_group pad_groups[VIMC_ENT_MAX_PADS];
+};
+
+/* Structure for link in configfs */
+struct vimc_cfs_link {
+ struct vimc_link_data link;
+ struct config_item ci;
+};
+
+void vimc_cfs_ent_type_register(struct vimc_cfs_ent_type *c_ent_type)
+{
+ pr_debug("%s: adding entity type %s\n", __func__, c_ent_type->name);
+ list_add(&c_ent_type->entry, &vimc_cfs_subsys.ent_types);
+}
+
+void vimc_cfs_ent_type_unregister(struct vimc_cfs_ent_type *c_ent_type)
+{
+ pr_debug("%s: removing entity type %s\n", __func__, c_ent_type->name);
+ list_del(&c_ent_type->entry);
+}
+
+/* --------------------------------------------------------------------------
+ * Platform Device builders
+ */
+
+static void vimc_cfs_device_unplug(struct vimc_cfs_device *cfs)
+{
+ mutex_lock(&cfs->pdev_mutex);
+ if (!IS_PLUGGED(cfs)) {
+ mutex_unlock(&cfs->pdev_mutex);
+ return;
+ }
+ dev_dbg(&cfs->pdev->dev, "Unplugging device\n");
+ platform_device_unregister(cfs->pdev);
+
+ cfs->pdev = NULL;
+ mutex_unlock(&cfs->pdev_mutex);
+}
+
+static void vimc_cfs_platform_dev_release(struct device *dev)
+{
+}
+
+static int vimc_cfs_device_plug(struct vimc_cfs_device *cfs)
+{
+ int ret;
+
+ cg_dbg(&cfs->gdev, "Plugging device\n");
+
+ mutex_lock(&cfs->pdata.topology_mutex);
+ if (list_empty(&cfs->pdata.ents)) {
+ cg_warn(&cfs->gdev,
+ "At least one entity is required to plug the device\n");
+ mutex_unlock(&cfs->pdata.topology_mutex);
+ return -EINVAL;
+ }
+ mutex_unlock(&cfs->pdata.topology_mutex);
+
+ mutex_lock(&cfs->pdev_mutex);
+ if (IS_PLUGGED(cfs)) {
+ mutex_unlock(&cfs->pdev_mutex);
+ return 0;
+ }
+
+ cfs->pdev = kzalloc(sizeof(*cfs->pdev), GFP_KERNEL);
+
+ if (!cfs->pdev) {
+ mutex_unlock(&cfs->pdev_mutex);
+ return -ENOMEM;
+ }
+
+ cfs->pdev->name = "vimc-core";
+ cfs->pdev->id = PLATFORM_DEVID_AUTO;
+ cfs->pdev->dev.platform_data = &cfs->pdata;
+ cfs->pdev->dev.release = vimc_cfs_platform_dev_release;
+
+ ret = platform_device_register(cfs->pdev);
+ if (ret) {
+ kfree(cfs->pdev);
+ cfs->pdev = NULL;
+ mutex_unlock(&cfs->pdev_mutex);
+ return ret;
+ }
+ mutex_unlock(&cfs->pdev_mutex);
+
+ return 0;
+}
+
+/* --------------------------------------------------------------------------
+ * Links
+ */
+
+static ssize_t vimc_cfs_link_type_store(struct config_item *item,
+ const char *buf,
+ size_t size)
+{
+ struct vimc_cfs_link *c_link =
+ container_of(item, struct vimc_cfs_link, ci);
+
+ ci_dbg(item, "buf = '%s'\n", buf);
+ if (!strcmp(buf, "disabled\n") || !strcmp(buf, "off\n") ||
+ !strcmp(buf, "disabled") || !strcmp(buf, "off")) {
+ c_link->link.flags &= ~MEDIA_LNK_FL_IMMUTABLE;
+ c_link->link.flags &= ~MEDIA_LNK_FL_ENABLED;
+ } else if (!strcmp(buf, "enabled\n") || !strcmp(buf, "on\n") ||
+ !strcmp(buf, "enabled") || !strcmp(buf, "on")) {
+ c_link->link.flags &= ~MEDIA_LNK_FL_IMMUTABLE;
+ c_link->link.flags |= MEDIA_LNK_FL_ENABLED;
+ } else if (!strcmp(buf, "immutable\n") || !strcmp(buf, "immutable")) {
+ c_link->link.flags |= MEDIA_LNK_FL_IMMUTABLE;
+ c_link->link.flags |= MEDIA_LNK_FL_ENABLED;
+ } else {
+ ci_err(item, "'%s' is an invalid value, see vimc doc for valid values",
+ buf);
+ return -EINVAL;
+ }
+ return strlen(buf);
+}
+
+
+static ssize_t vimc_cfs_link_type_show(struct config_item *item,
+ char *buf)
+{
+ struct vimc_cfs_link *c_link = container_of(item,
+ struct vimc_cfs_link, ci);
+
+ if (c_link->link.flags & MEDIA_LNK_FL_IMMUTABLE)
+ strcpy(buf, "immutable\n");
+ else if (c_link->link.flags & MEDIA_LNK_FL_ENABLED)
+ strcpy(buf, "enabled\n");
+ else
+ strcpy(buf, "disabled\n");
+ return strlen(buf);
+}
+
+CONFIGFS_ATTR(vimc_cfs_link_, type);
+
+/*
+ * add the link to the list of links
+ * this function assumes src and target are valid and that the su_mutex
+ * is locked
+ */
+static int vimc_cfs_adding_link(struct config_item *src,
+ struct config_item *target)
+{
+ struct config_item *src_ent_ci = src->ci_parent;
+ struct config_item *trgt_ent_ci = target->ci_parent->ci_parent;
+ struct vimc_cfs_link *c_link =
+ container_of(target, struct vimc_cfs_link, ci);
+ struct vimc_cfs_ent *vimc_src_ent = container_of(src_ent_ci,
+ struct vimc_cfs_ent,
+ cg.cg_item);
+ struct vimc_cfs_ent *vimc_trgt_ent = container_of(trgt_ent_ci,
+ struct vimc_cfs_ent,
+ cg.cg_item);
+ struct vimc_cfs_device *cfs = container_of(src_ent_ci->ci_parent,
+ struct vimc_cfs_device,
+ gdev.cg_item);
+
+ mutex_lock(&cfs->pdata.topology_mutex);
+ if (c_link->link.source) {
+ ci_warn(src, "the sink target %s is already linked\n",
+ target->ci_name);
+ mutex_unlock(&cfs->pdata.topology_mutex);
+ return -EINVAL;
+ }
+
+ /* src and target validation already done in the allow_link callback,
+ * so there is no need to check sscanf result
+ */
+ sscanf(src->ci_name, VIMC_CFS_SRC_PAD "%hu",
+ &c_link->link.source_pad);
+ sscanf(target->ci_parent->ci_name, VIMC_CFS_SINK_PAD "%hu",
+ &c_link->link.sink_pad);
+
+ c_link->link.source = &vimc_src_ent->ent;
+ c_link->link.sink = &vimc_trgt_ent->ent;
+
+ cg_dbg(&cfs->gdev, "creating link %s:%u->%s:%u\n",
+ c_link->link.source->name, c_link->link.source_pad,
+ c_link->link.sink->name, c_link->link.sink_pad);
+
+ list_add(&c_link->link.entry, &cfs->pdata.links);
+ mutex_unlock(&cfs->pdata.topology_mutex);
+ return 0;
+}
+
+static void vimc_cfs_drop_link(struct config_item *src,
+ struct config_item *target)
+{
+ struct vimc_cfs_link *c_link = container_of(target,
+ struct vimc_cfs_link, ci);
+ struct config_item *src_ent_ci = src->ci_parent;
+ struct vimc_cfs_device *cfs = container_of(src_ent_ci->ci_parent,
+ struct vimc_cfs_device,
+ gdev.cg_item);
+
+ mutex_lock(&cfs->pdata.topology_mutex);
+ ci_dbg(&c_link->ci, "dropping link %s:%u->%s:%u\n",
+ c_link->link.source->name, c_link->link.source_pad,
+ c_link->link.sink->name, c_link->link.sink_pad);
+
+ c_link->link.source_pad = 0;
+ c_link->link.sink_pad = 0;
+ c_link->link.source = NULL;
+ c_link->link.sink = NULL;
+ list_del(&c_link->link.entry);
+ mutex_unlock(&cfs->pdata.topology_mutex);
+}
+
+static int vimc_cfs_allow_link(struct config_item *src,
+ struct config_item *target)
+{
+ struct config_item *src_vimc_dev;
+ struct config_item *target_vimc_dev;
+ struct config_item *tmp;
+ struct config_item *src_ent_ci, *trgt_ent_ci;
+ int target_depth = 0, ret = 0;
+
+
+ mutex_lock(&vimc_cfs_subsys.subsys.su_mutex);
+
+ /* the allow_link callback exists only for dirs of the form
+ * $CONFIGFS/vimc/<dev>/vimc-<type>:<name>/source:<pad>/
+ * therefore, we can be sure that parent and grandparent are non NULL
+ * and that grandparent is the vimc device
+ */
+ src_vimc_dev = src->ci_parent->ci_parent;
+
+
+ /* the target must be of the form:
+ * $CONFIGFS/vimc/<dev>/vimc-<type>:<name>/sink:<pad>/<link-name>
+ * so we should make sure that it's depth is exactly 5
+ */
+ for (tmp = target->ci_parent; tmp; tmp = tmp->ci_parent)
+ target_depth++;
+
+ if (target_depth != 5) {
+ ci_warn(src, "link target (%s) is not a sink pad\n",
+ target->ci_name);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ /*
+ * make sure that the target is under a directory named
+ * 'sink:<pad>
+ */
+ if (strncmp(target->ci_parent->ci_name, VIMC_CFS_SINK_PAD,
+ sizeof(VIMC_CFS_SINK_PAD) - 1)) {
+ ci_warn(src, "link target (%s) is not a sink pad\n",
+ target->ci_name);
+ ret = -EINVAL;
+ goto end;
+ }
+
+ target_vimc_dev = target->ci_parent->ci_parent->ci_parent;
+ if (src_vimc_dev != target_vimc_dev) {
+ ci_warn(src, "linking between different vimc devices: (%s), (%s) is not allowed\n",
+ src_vimc_dev->ci_name, target_vimc_dev->ci_name);
+ ret = -EINVAL;
+ goto end;
+ }
+ src_ent_ci = target->ci_parent;
+ trgt_ent_ci = src->ci_parent->ci_parent;
+ if (src_ent_ci == trgt_ent_ci) {
+ ci_warn(src, "both pads belong to the same entity (%s) - this is not allowed\n",
+ src_ent_ci->ci_name);
+ ret = -EINVAL;
+ goto end;
+ }
+ ret = vimc_cfs_adding_link(src, target);
+ if (ret)
+ goto end;
+end:
+ mutex_unlock(&vimc_cfs_subsys.subsys.su_mutex);
+ return ret;
+}
+
+static void vimc_cfs_link_target_release(struct config_item *item)
+{
+ struct vimc_cfs_link *c_link = container_of(item,
+ struct vimc_cfs_link, ci);
+
+ ci_dbg(item, "releasing link target '%s'", item->ci_name);
+ kfree(c_link);
+}
+
+static struct configfs_attribute *vimc_cfs_link_attrs[] = {
+ &vimc_cfs_link_attr_type,
+ NULL,
+};
+
+static struct configfs_item_operations vimc_cfs_link_target_ops = {
+ .release = vimc_cfs_link_target_release,
+};
+
+
+static struct config_item_type vimc_cfs_link_target_type = {
+ .ct_owner = THIS_MODULE,
+ .ct_attrs = vimc_cfs_link_attrs,
+ .ct_item_ops = &vimc_cfs_link_target_ops,
+};
+
+/* --------------------------------------------------------------------------
+ * Source pad instance
+ */
+
+static void vimc_cfs_sink_pad_link_target_drop_item(
+ struct config_group *sink_pad_group,
+ struct config_item *c_link)
+{
+
+ struct config_item *cfs_item;
+ struct vimc_cfs_device *cfs;
+
+ cfs_item = sink_pad_group->cg_item.ci_parent->ci_parent;
+ cfs = container_of(cfs_item, struct vimc_cfs_device, gdev.cg_item);
+ cg_dbg(&cfs->gdev, "dropping link target '%s' cfs=%p\n",
+ c_link->ci_name, cfs);
+ config_item_put(c_link);
+}
+
+static struct config_item *vimc_cfs_sink_pad_link_target_make_item(
+ struct config_group *group,
+ const char *name)
+{
+ struct vimc_cfs_link *c_link = kzalloc(sizeof(*c_link), GFP_KERNEL);
+
+ cg_dbg(group, "link target name is '%s'\n", name);
+ config_item_init_type_name(&c_link->ci, name,
+ &vimc_cfs_link_target_type);
+ return &c_link->ci;
+}
+
+static struct configfs_group_operations vimc_cfs_sink_pad_ops = {
+ .make_item = vimc_cfs_sink_pad_link_target_make_item,
+ .drop_item = vimc_cfs_sink_pad_link_target_drop_item,
+};
+
+static struct configfs_item_operations vimc_cfs_src_pad_ops = {
+ .allow_link = vimc_cfs_allow_link,
+ .drop_link = vimc_cfs_drop_link,
+};
+
+
+static struct config_item_type vimc_cfs_src_pad_type = {
+ .ct_owner = THIS_MODULE,
+ .ct_item_ops = &vimc_cfs_src_pad_ops,
+};
+
+static struct config_item_type vimc_cfs_sink_pad_type = {
+ .ct_owner = THIS_MODULE,
+ .ct_group_ops = &vimc_cfs_sink_pad_ops,
+};
+
+
+/* --------------------------------------------------------------------------
+ * Device instance
+ */
+
+static void vimc_cfs_ent_release(struct config_item *item)
+{
+ struct vimc_cfs_ent *c_ent = container_of(item, struct vimc_cfs_ent,
+ cg.cg_item);
+
+ ci_dbg(item, "releasing entity '%s' of type '%s'",
+ c_ent->ent.name, c_ent->ent.type_name);
+ kfree(c_ent);
+}
+
+static struct configfs_item_operations vimc_cfs_ent_item_ops = {
+ .release = vimc_cfs_ent_release,
+};
+
+static struct config_item_type vimc_cfs_ent_type = {
+ .ct_owner = THIS_MODULE,
+ .ct_item_ops = &vimc_cfs_ent_item_ops,
+};
+
+void vimc_cfs_add_sink_pad(struct config_group *ent_group,
+ int pad_idx, const char *name)
+{
+ struct vimc_cfs_ent *c_ent = container_of(ent_group,
+ struct vimc_cfs_ent, cg);
+
+ config_group_init_type_name(&c_ent->pad_groups[pad_idx], name,
+ &vimc_cfs_sink_pad_type);
+ configfs_add_default_group(&c_ent->pad_groups[pad_idx], ent_group);
+}
+
+
+void vimc_cfs_add_source_pad(struct config_group *ent_group,
+ int pad_idx, const char *name)
+{
+ struct vimc_cfs_ent *c_ent = container_of(ent_group,
+ struct vimc_cfs_ent, cg);
+
+ config_group_init_type_name(&c_ent->pad_groups[pad_idx], name,
+ &vimc_cfs_src_pad_type);
+ configfs_add_default_group(&c_ent->pad_groups[pad_idx], ent_group);
+}
+
+static void vimc_cfs_dev_drop_ent_item(struct config_group *dev_group,
+ struct config_item *ent_item)
+{
+ struct vimc_cfs_ent *c_ent = container_of(ent_item, struct vimc_cfs_ent,
+ cg.cg_item);
+ struct vimc_cfs_device *cfs = container_of(dev_group,
+ struct vimc_cfs_device,
+ gdev);
+
+ cg_dbg(&cfs->gdev, "dropping entity '%s' of type '%s'",
+ c_ent->ent.name, c_ent->ent.type_name);
+ mutex_lock(&cfs->pdata.topology_mutex);
+ list_del(&c_ent->ent.entry);
+ mutex_unlock(&cfs->pdata.topology_mutex);
+ config_item_put(ent_item);
+}
+
+static struct config_group *vimc_cfs_dev_make_ent_group(
+ struct config_group *group, const char *name)
+{
+ struct vimc_cfs_device *cfs = container_of(group,
+ struct vimc_cfs_device,
+ gdev);
+ char *type_name, *ent_name, *sep;
+ struct vimc_cfs_ent *c_ent;
+ struct vimc_entity_data *ent;
+ struct vimc_cfs_ent_type *c_ent_type = NULL;
+ char buf[VIMC_MAX_CFS_NAME_LEN];
+
+ cg_dbg(group, "trying to make entity '%s'\n", name);
+ if (snprintf(buf, VIMC_MAX_CFS_NAME_LEN, "%s", name) >= sizeof(buf))
+ return ERR_PTR(-ENAMETOOLONG);
+
+ /* Parse format "type_name:ent_name" */
+ sep = strchr(buf, CHAR_SEPARATOR);
+ if (!sep) {
+ cg_warn(&cfs->gdev,
+ "Could not find separator '%c'\n", CHAR_SEPARATOR);
+ goto syntax_error;
+ }
+ *sep = '\0';
+
+ ent_name = &sep[1];
+ type_name = buf;
+
+ if (!*ent_name || sep == type_name) {
+ cg_warn(&cfs->gdev,
+ "%s: Driver name and entity name can't be empty.\n",
+ name);
+ goto syntax_error;
+ }
+ if (strlen(ent_name) >= VIMC_MAX_NAME_LEN) {
+ cg_err(&cfs->gdev,
+ "%s: Driver name length should be less than %u.\n",
+ name, VIMC_MAX_NAME_LEN);
+ goto syntax_error;
+ }
+ mutex_lock(&cfs->pdata.topology_mutex);
+ list_for_each_entry(ent, &cfs->pdata.ents, entry) {
+ if (!strncmp(ent->name, ent_name, sizeof(ent->name))) {
+ cg_err(&cfs->gdev, "entity `%s` already exist\n",
+ ent->name);
+ mutex_unlock(&cfs->pdata.topology_mutex);
+ goto syntax_error;
+ }
+ }
+
+ c_ent = kzalloc(sizeof(*c_ent), GFP_KERNEL);
+ if (!c_ent) {
+ mutex_unlock(&cfs->pdata.topology_mutex);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ strscpy(c_ent->ent.name, ent_name, sizeof(c_ent->ent.name));
+
+ /* TODO: add support for hotplug at entity level */
+ list_for_each_entry(c_ent_type, &vimc_cfs_subsys.ent_types, entry) {
+ if (!strcmp(type_name, c_ent_type->name)) {
+ config_group_init_type_name(&c_ent->cg, ent_name,
+ &vimc_cfs_ent_type);
+ if (c_ent_type->create_pads)
+ c_ent_type->create_pads(&c_ent->cg);
+ c_ent->ent.type_name = c_ent_type->name;
+ list_add(&c_ent->ent.entry, &cfs->pdata.ents);
+ mutex_unlock(&cfs->pdata.topology_mutex);
+ return &c_ent->cg;
+ }
+ }
+ mutex_unlock(&cfs->pdata.topology_mutex);
+ cg_warn(&cfs->gdev, "entity type '%s' not found\n", type_name);
+ kfree(c_ent);
+ return ERR_PTR(-EINVAL);
+
+syntax_error:
+ cg_err(&cfs->gdev,
+ "couldn't create entity '%s' wrong syntax.", name);
+ return ERR_PTR(-EINVAL);
+}
+
+static int vimc_cfs_decode_state(const char *buf, size_t size)
+{
+ unsigned int i, j;
+
+ for (i = 0; i < ARRAY_SIZE(vimc_cfs_hotplug_values); i++) {
+ for (j = 0; j < ARRAY_SIZE(vimc_cfs_hotplug_values[0]); j++) {
+ if (!strncmp(buf, vimc_cfs_hotplug_values[i][j], size))
+ return i;
+ }
+ }
+ return -EINVAL;
+}
+
+static ssize_t vimc_cfs_dev_hotplug_show(struct config_item *item,
+ char *buf)
+{
+ struct vimc_cfs_device *cfs = container_of(item, struct vimc_cfs_device,
+ gdev.cg_item);
+
+ cg_dbg(&cfs->gdev, "%s: cfs=%p\n", __func__, cfs);
+ strcpy(buf, vimc_cfs_hotplug_values[IS_PLUGGED(cfs)][0]);
+ return strlen(buf);
+}
+
+static ssize_t vimc_cfs_dev_hotplug_store(struct config_item *item,
+ const char *buf, size_t size)
+{
+ struct vimc_cfs_device *cfs = container_of(item, struct vimc_cfs_device,
+ gdev.cg_item);
+ int state = vimc_cfs_decode_state(buf, size);
+
+ cg_dbg(&cfs->gdev, "%s: cfs=%p\n", __func__, cfs);
+ if (state == VIMC_CFS_HOTPLUG_STATE_UNPLUGGED) {
+ vimc_cfs_device_unplug(cfs);
+ } else if (state == VIMC_CFS_HOTPLUG_STATE_PLUGGED) {
+ int ret = vimc_cfs_device_plug(cfs);
+
+ if (ret)
+ return ret;
+ }
+ return size;
+}
+
+CONFIGFS_ATTR(vimc_cfs_dev_, hotplug);
+
+static void vimc_cfs_dev_release(struct config_item *item)
+{
+ struct vimc_cfs_device *cfs = container_of(item, struct vimc_cfs_device,
+ gdev.cg_item);
+
+ ci_dbg(item, "releasing dev %s (%p)\n", item->ci_name, cfs);
+ kfree(cfs);
+}
+
+static struct configfs_group_operations vimc_cfs_dev_group_ops = {
+ .make_group = vimc_cfs_dev_make_ent_group,
+ .drop_item = vimc_cfs_dev_drop_ent_item,
+};
+
+static struct configfs_item_operations vimc_cfs_dev_item_ops = {
+ .release = vimc_cfs_dev_release,
+};
+
+static struct configfs_attribute *vimc_cfs_dev_attrs[] = {
+ &vimc_cfs_dev_attr_hotplug,
+ NULL,
+};
+
+static struct config_item_type vimc_cfs_dev_type = {
+ .ct_group_ops = &vimc_cfs_dev_group_ops,
+ .ct_item_ops = &vimc_cfs_dev_item_ops,
+ .ct_attrs = vimc_cfs_dev_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+/* --------------------------------------------------------------------------
+ * Subsystem
+ * --------------------------------------------------------------------------
+ */
+
+static void vimc_cfs_subsys_drop_dev_item(struct config_group *group,
+ struct config_item *item)
+{
+ struct vimc_cfs_device *cfs = container_of(to_config_group(item),
+ struct vimc_cfs_device,
+ gdev);
+
+ cg_dbg(&cfs->gdev, "dropping dev item '%s'", item->ci_name);
+ vimc_cfs_device_unplug(cfs);
+ config_item_put(item);
+}
+
+static struct config_group *vimc_cfs_subsys_make_dev_group(
+ struct config_group *group, const char *name)
+{
+ struct vimc_cfs_device *cfs = kzalloc(sizeof(*cfs), GFP_KERNEL);
+
+ if (!cfs)
+ return ERR_PTR(-ENOMEM);
+
+ cg_dbg(&cfs->gdev, "making dev group '%s'", name);
+ /* Configure platform data */
+ mutex_init(&cfs->pdata.topology_mutex);
+ INIT_LIST_HEAD(&cfs->pdata.ents);
+ INIT_LIST_HEAD(&cfs->pdata.links);
+ mutex_init(&cfs->pdev_mutex);
+ config_group_init_type_name(&cfs->gdev, name, &vimc_cfs_dev_type);
+
+ return &cfs->gdev;
+}
+
+int vimc_cfs_subsys_register(void)
+{
+ config_group_init(&vimc_cfs_subsys.subsys.su_group);
+ return configfs_register_subsystem(&vimc_cfs_subsys.subsys);
+}
+
+void vimc_cfs_subsys_unregister(void)
+{
+ configfs_unregister_subsystem(&vimc_cfs_subsys.subsys);
+}
diff --git a/drivers/media/platform/vimc/vimc-configfs.h b/drivers/media/platform/vimc/vimc-configfs.h
new file mode 100644
index 000000000000..d6789914850c
--- /dev/null
+++ b/drivers/media/platform/vimc/vimc-configfs.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * vimc-configfs.h Virtual Media Controller Driver
+ *
+ * Copyright (C) 2018 Helen Koike <helen.koike@xxxxxxxxxxxxx>
+ */
+
+#ifndef _VIMC_CONFIGFS_H_
+#define _VIMC_CONFIGFS_H_
+
+#include <linux/configfs.h>
+
+#define VIMC_CFS_SRC_PAD "source:"
+#define VIMC_CFS_SINK_PAD "sink:"
+
+#define VIMC_CFS_SRC_PAD_NUM(n) "source:" #n
+#define VIMC_CFS_SINK_PAD_NUM(n) "sink:" #n
+
+extern struct config_item_type vimc_default_cfs_pad_type;
+
+void vimc_cfs_add_source_pad(struct config_group *ent_group,
+ int pad_idx, const char *name);
+
+void vimc_cfs_add_sink_pad(struct config_group *ent_group,
+ int pad_idx, const char *name);
+struct vimc_cfs_ent_type {
+ const char *name;
+ struct list_head entry;
+
+ void (*const create_pads)(struct config_group *parent);
+};
+
+int vimc_cfs_subsys_register(void);
+
+void vimc_cfs_subsys_unregister(void);
+
+void vimc_cfs_ent_type_register(struct vimc_cfs_ent_type *c_ent_type);
+
+void vimc_cfs_ent_type_unregister(struct vimc_cfs_ent_type *c_ent_type);
+
+#endif
diff --git a/drivers/media/platform/vimc/vimc-debayer.c b/drivers/media/platform/vimc/vimc-debayer.c
index 8860ca3bf400..715de945e3a2 100644
--- a/drivers/media/platform/vimc/vimc-debayer.c
+++ b/drivers/media/platform/vimc/vimc-debayer.c
@@ -14,6 +14,7 @@
#include <media/v4l2-subdev.h>
#include "vimc-common.h"
+#include "vimc-configfs.h"
enum vimc_deb_rgb_colors {
VIMC_DEB_RED = 0,
@@ -604,3 +605,24 @@ struct vimc_ent_device *vimc_deb_add(struct vimc_device *vimc,
return NULL;
}
+
+static void vimc_deb_create_cfs_pads(struct config_group *ent_group)
+{
+ vimc_cfs_add_source_pad(ent_group, 0, VIMC_CFS_SRC_PAD_NUM(1));
+ vimc_cfs_add_sink_pad(ent_group, 1, VIMC_CFS_SINK_PAD_NUM(0));
+}
+
+struct vimc_cfs_ent_type vimc_deb_cfs_ent_type = {
+ .name = VIMC_DEB_NAME,
+ .create_pads = vimc_deb_create_cfs_pads,
+};
+
+void vimc_deb_exit(void)
+{
+ vimc_cfs_ent_type_unregister(&vimc_deb_cfs_ent_type);
+}
+
+void vimc_deb_init(void)
+{
+ vimc_cfs_ent_type_register(&vimc_deb_cfs_ent_type);
+}
diff --git a/drivers/media/platform/vimc/vimc-scaler.c b/drivers/media/platform/vimc/vimc-scaler.c
index cb04408834b5..d4d20c579bc8 100644
--- a/drivers/media/platform/vimc/vimc-scaler.c
+++ b/drivers/media/platform/vimc/vimc-scaler.c
@@ -10,6 +10,7 @@
#include <linux/v4l2-mediabus.h>
#include <media/v4l2-subdev.h>
+#include "vimc-configfs.h"
#include "vimc-common.h"
static unsigned int sca_mult = 3;
@@ -398,3 +399,24 @@ struct vimc_ent_device *vimc_sca_add(struct vimc_device *vimc,
return &vsca->ved;
}
+
+static void vimc_sca_create_cfs_pads(struct config_group *ent_group)
+{
+ vimc_cfs_add_source_pad(ent_group, 0, VIMC_CFS_SRC_PAD_NUM(1));
+ vimc_cfs_add_sink_pad(ent_group, 1, VIMC_CFS_SINK_PAD_NUM(0));
+}
+
+struct vimc_cfs_ent_type vimc_sca_cfs_ent_type = {
+ .name = VIMC_SCA_NAME,
+ .create_pads = vimc_sca_create_cfs_pads,
+};
+
+void vimc_sca_exit(void)
+{
+ vimc_cfs_ent_type_unregister(&vimc_sca_cfs_ent_type);
+}
+
+void vimc_sca_init(void)
+{
+ vimc_cfs_ent_type_register(&vimc_sca_cfs_ent_type);
+}
diff --git a/drivers/media/platform/vimc/vimc-sensor.c b/drivers/media/platform/vimc/vimc-sensor.c
index f137ff23b892..4ea831c834df 100644
--- a/drivers/media/platform/vimc/vimc-sensor.c
+++ b/drivers/media/platform/vimc/vimc-sensor.c
@@ -12,6 +12,7 @@
#include <media/v4l2-subdev.h>
#include <media/tpg/v4l2-tpg.h>
+#include "vimc-configfs.h"
#include "vimc-common.h"
struct vimc_sen_device {
@@ -401,3 +402,23 @@ struct vimc_ent_device *vimc_sen_add(struct vimc_device *vimc,
return NULL;
}
+
+static void vimc_sen_create_cfs_pads(struct config_group *ent_group)
+{
+ vimc_cfs_add_source_pad(ent_group, 0, VIMC_CFS_SRC_PAD_NUM(0));
+}
+
+struct vimc_cfs_ent_type vimc_sen_cfs_ent_type = {
+ .name = VIMC_SEN_NAME,
+ .create_pads = vimc_sen_create_cfs_pads,
+};
+
+void vimc_sen_exit(void)
+{
+ vimc_cfs_ent_type_unregister(&vimc_sen_cfs_ent_type);
+}
+
+void vimc_sen_init(void)
+{
+ vimc_cfs_ent_type_register(&vimc_sen_cfs_ent_type);
+}
--
2.20.1
