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-rw-r--r--Documentation/ABI/testing/configfs-usb-gadget21
-rw-r--r--drivers/usb/gadget/configfs.c201
-rw-r--r--include/linux/usb/composite.h4
3 files changed, 226 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/configfs-usb-gadget b/Documentation/ABI/testing/configfs-usb-gadget
index 5c0b3e6eb981..95a36589a66b 100644
--- a/Documentation/ABI/testing/configfs-usb-gadget
+++ b/Documentation/ABI/testing/configfs-usb-gadget
@@ -75,6 +75,27 @@ Description:
compatible_id - 8-byte string for "Compatible ID"
sub_compatible_id - 8-byte string for "Sub Compatible ID"
+What: /config/usb-gadget/gadget/functions/<func>.<inst>/interface.<n>/<property>
+Date: May 2014
+KernelVersion: 3.16
+Description:
+ This group contains "Extended Property Descriptors" specific for one
+ gadget's USB interface or one interface group described
+ by an IAD.
+
+ The attributes:
+
+ type - value 1..7 for interpreting the data
+ 1: unicode string
+ 2: unicode string with environment variable
+ 3: binary
+ 4: little-endian 32-bit
+ 5: big-endian 32-bit
+ 6: unicode string with a symbolic link
+ 7: multiple unicode strings
+ data - blob of data to be interpreted depending on
+ type
+
What: /config/usb-gadget/gadget/strings
Date: Jun 2013
KernelVersion: 3.11
diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index fa6cb06cca09..2ddcd635ca2a 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -7,6 +7,7 @@
#include <linux/usb/gadget_configfs.h>
#include "configfs.h"
#include "u_f.h"
+#include "u_os_desc.h"
int check_user_usb_string(const char *name,
struct usb_gadget_strings *stringtab_dev)
@@ -941,6 +942,204 @@ static struct config_item_type os_desc_type = {
CONFIGFS_ATTR_STRUCT(usb_os_desc);
CONFIGFS_ATTR_OPS(usb_os_desc);
+
+static inline struct usb_os_desc_ext_prop
+*to_usb_os_desc_ext_prop(struct config_item *item)
+{
+ return container_of(item, struct usb_os_desc_ext_prop, item);
+}
+
+CONFIGFS_ATTR_STRUCT(usb_os_desc_ext_prop);
+CONFIGFS_ATTR_OPS(usb_os_desc_ext_prop);
+
+static ssize_t ext_prop_type_show(struct usb_os_desc_ext_prop *ext_prop,
+ char *page)
+{
+ return sprintf(page, "%d", ext_prop->type);
+}
+
+static ssize_t ext_prop_type_store(struct usb_os_desc_ext_prop *ext_prop,
+ const char *page, size_t len)
+{
+ struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
+ u8 type;
+ int ret;
+
+ if (desc->opts_mutex)
+ mutex_lock(desc->opts_mutex);
+ ret = kstrtou8(page, 0, &type);
+ if (ret)
+ goto end;
+ if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
+ ret = -EINVAL;
+ goto end;
+ }
+
+ if ((ext_prop->type == USB_EXT_PROP_BINARY ||
+ ext_prop->type == USB_EXT_PROP_LE32 ||
+ ext_prop->type == USB_EXT_PROP_BE32) &&
+ (type == USB_EXT_PROP_UNICODE ||
+ type == USB_EXT_PROP_UNICODE_ENV ||
+ type == USB_EXT_PROP_UNICODE_LINK))
+ ext_prop->data_len <<= 1;
+ else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
+ ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
+ ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
+ (type == USB_EXT_PROP_BINARY ||
+ type == USB_EXT_PROP_LE32 ||
+ type == USB_EXT_PROP_BE32))
+ ext_prop->data_len >>= 1;
+ ext_prop->type = type;
+ ret = len;
+
+end:
+ if (desc->opts_mutex)
+ mutex_unlock(desc->opts_mutex);
+ return ret;
+}
+
+static ssize_t ext_prop_data_show(struct usb_os_desc_ext_prop *ext_prop,
+ char *page)
+{
+ int len = ext_prop->data_len;
+
+ if (ext_prop->type == USB_EXT_PROP_UNICODE ||
+ ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
+ ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
+ len >>= 1;
+ memcpy(page, ext_prop->data, len);
+
+ return len;
+}
+
+static ssize_t ext_prop_data_store(struct usb_os_desc_ext_prop *ext_prop,
+ const char *page, size_t len)
+{
+ struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
+ char *new_data;
+ size_t ret_len = len;
+
+ if (page[len - 1] == '\n' || page[len - 1] == '\0')
+ --len;
+ new_data = kzalloc(len, GFP_KERNEL);
+ if (!new_data)
+ return -ENOMEM;
+
+ memcpy(new_data, page, len);
+
+ if (desc->opts_mutex)
+ mutex_lock(desc->opts_mutex);
+ kfree(ext_prop->data);
+ ext_prop->data = new_data;
+ desc->ext_prop_len -= ext_prop->data_len;
+ ext_prop->data_len = len;
+ desc->ext_prop_len += ext_prop->data_len;
+ if (ext_prop->type == USB_EXT_PROP_UNICODE ||
+ ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
+ ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
+ desc->ext_prop_len -= ext_prop->data_len;
+ ext_prop->data_len <<= 1;
+ ext_prop->data_len += 2;
+ desc->ext_prop_len += ext_prop->data_len;
+ }
+ if (desc->opts_mutex)
+ mutex_unlock(desc->opts_mutex);
+ return ret_len;
+}
+
+static struct usb_os_desc_ext_prop_attribute ext_prop_type =
+ __CONFIGFS_ATTR(type, S_IRUGO | S_IWUSR,
+ ext_prop_type_show, ext_prop_type_store);
+
+static struct usb_os_desc_ext_prop_attribute ext_prop_data =
+ __CONFIGFS_ATTR(data, S_IRUGO | S_IWUSR,
+ ext_prop_data_show, ext_prop_data_store);
+
+static struct configfs_attribute *ext_prop_attrs[] = {
+ &ext_prop_type.attr,
+ &ext_prop_data.attr,
+ NULL,
+};
+
+static void usb_os_desc_ext_prop_release(struct config_item *item)
+{
+ struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
+
+ kfree(ext_prop); /* frees a whole chunk */
+}
+
+static struct configfs_item_operations ext_prop_ops = {
+ .release = usb_os_desc_ext_prop_release,
+ .show_attribute = usb_os_desc_ext_prop_attr_show,
+ .store_attribute = usb_os_desc_ext_prop_attr_store,
+};
+
+static struct config_item *ext_prop_make(
+ struct config_group *group,
+ const char *name)
+{
+ struct usb_os_desc_ext_prop *ext_prop;
+ struct config_item_type *ext_prop_type;
+ struct usb_os_desc *desc;
+ char *vlabuf;
+
+ vla_group(data_chunk);
+ vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
+ vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
+
+ vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
+ if (!vlabuf)
+ return ERR_PTR(-ENOMEM);
+
+ ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
+ ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
+
+ desc = container_of(group, struct usb_os_desc, group);
+ ext_prop_type->ct_item_ops = &ext_prop_ops;
+ ext_prop_type->ct_attrs = ext_prop_attrs;
+ ext_prop_type->ct_owner = desc->owner;
+
+ config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
+
+ ext_prop->name = kstrdup(name, GFP_KERNEL);
+ if (!ext_prop->name) {
+ kfree(vlabuf);
+ return ERR_PTR(-ENOMEM);
+ }
+ desc->ext_prop_len += 14;
+ ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
+ if (desc->opts_mutex)
+ mutex_lock(desc->opts_mutex);
+ desc->ext_prop_len += ext_prop->name_len;
+ list_add_tail(&ext_prop->entry, &desc->ext_prop);
+ ++desc->ext_prop_count;
+ if (desc->opts_mutex)
+ mutex_unlock(desc->opts_mutex);
+
+ return &ext_prop->item;
+}
+
+static void ext_prop_drop(struct config_group *group, struct config_item *item)
+{
+ struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
+ struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
+
+ if (desc->opts_mutex)
+ mutex_lock(desc->opts_mutex);
+ list_del(&ext_prop->entry);
+ --desc->ext_prop_count;
+ kfree(ext_prop->name);
+ desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
+ if (desc->opts_mutex)
+ mutex_unlock(desc->opts_mutex);
+ config_item_put(item);
+}
+
+static struct configfs_group_operations interf_grp_ops = {
+ .make_item = &ext_prop_make,
+ .drop_item = &ext_prop_drop,
+};
+
static struct configfs_item_operations interf_item_ops = {
.show_attribute = usb_os_desc_attr_show,
.store_attribute = usb_os_desc_attr_store,
@@ -1048,6 +1247,7 @@ int usb_os_desc_prepare_interf_dir(struct config_group *parent,
os_desc_group->default_groups = interface_groups;
interface_type->ct_item_ops = &interf_item_ops;
+ interface_type->ct_group_ops = &interf_grp_ops;
interface_type->ct_attrs = interf_grp_attrs;
interface_type->ct_owner = owner;
@@ -1055,6 +1255,7 @@ int usb_os_desc_prepare_interf_dir(struct config_group *parent,
struct usb_os_desc *d;
d = desc[n_interf];
+ d->owner = owner;
config_group_init_type_name(&d->group, "", interface_type);
config_item_set_name(&d->group.cg_item, "interface.%d",
n_interf);
diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index 9c3903d76781..7373203140e7 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -64,6 +64,7 @@ struct usb_configuration;
* @name: Extended Property name
* @data_len: Length of Extended Property blob (for unicode store double len)
* @data: Extended Property blob
+ * @item: Represents this Extended Property in configfs
*/
struct usb_os_desc_ext_prop {
struct list_head entry;
@@ -72,6 +73,7 @@ struct usb_os_desc_ext_prop {
char *name;
int data_len;
char *data;
+ struct config_item item;
};
/**
@@ -82,6 +84,7 @@ struct usb_os_desc_ext_prop {
* @ext_prop_count: Number of Extended Properties
* @opts_mutex: Optional mutex protecting config data of a usb_function_instance
* @group: Represents OS descriptors associated with an interface in configfs
+ * @owner: Module associated with this OS descriptor
*/
struct usb_os_desc {
char *ext_compat_id;
@@ -90,6 +93,7 @@ struct usb_os_desc {
int ext_prop_count;
struct mutex *opts_mutex;
struct config_group group;
+ struct module *owner;
};
/**
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