diff options
| -rw-r--r-- | Documentation/ABI/testing/configfs-usb-gadget | 13 | ||||
| -rw-r--r-- | drivers/usb/gadget/configfs.c | 190 | ||||
| -rw-r--r-- | drivers/usb/gadget/configfs.h | 12 | ||||
| -rw-r--r-- | include/linux/usb/composite.h | 6 |
4 files changed, 221 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/configfs-usb-gadget b/Documentation/ABI/testing/configfs-usb-gadget index 0e7b786f24ac..5c0b3e6eb981 100644 --- a/Documentation/ABI/testing/configfs-usb-gadget +++ b/Documentation/ABI/testing/configfs-usb-gadget @@ -62,6 +62,19 @@ KernelVersion: 3.11 Description: This group contains functions available to this USB gadget. +What: /config/usb-gadget/gadget/functions/<func>.<inst>/interface.<n> +Date: May 2014 +KernelVersion: 3.16 +Description: + This group contains "Feature Descriptors" specific for one + gadget's USB interface or one interface group described + by an IAD. + + The attributes: + + compatible_id - 8-byte string for "Compatible ID" + sub_compatible_id - 8-byte string for "Sub Compatible ID" + 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 8b9e038ac22b..fa6cb06cca09 100644 --- a/drivers/usb/gadget/configfs.c +++ b/drivers/usb/gadget/configfs.c @@ -6,6 +6,7 @@ #include <linux/usb/composite.h> #include <linux/usb/gadget_configfs.h> #include "configfs.h" +#include "u_f.h" int check_user_usb_string(const char *name, struct usb_gadget_strings *stringtab_dev) @@ -872,10 +873,63 @@ static void os_desc_attr_release(struct config_item *item) kfree(os_desc); } +static int os_desc_link(struct config_item *os_desc_ci, + struct config_item *usb_cfg_ci) +{ + struct gadget_info *gi = container_of(to_config_group(os_desc_ci), + struct gadget_info, os_desc_group); + struct usb_composite_dev *cdev = &gi->cdev; + struct config_usb_cfg *c_target = + container_of(to_config_group(usb_cfg_ci), + struct config_usb_cfg, group); + struct usb_configuration *c; + int ret; + + mutex_lock(&gi->lock); + list_for_each_entry(c, &cdev->configs, list) { + if (c == &c_target->c) + break; + } + if (c != &c_target->c) { + ret = -EINVAL; + goto out; + } + + if (cdev->os_desc_config) { + ret = -EBUSY; + goto out; + } + + cdev->os_desc_config = &c_target->c; + ret = 0; + +out: + mutex_unlock(&gi->lock); + return ret; +} + +static int os_desc_unlink(struct config_item *os_desc_ci, + struct config_item *usb_cfg_ci) +{ + struct gadget_info *gi = container_of(to_config_group(os_desc_ci), + struct gadget_info, os_desc_group); + struct usb_composite_dev *cdev = &gi->cdev; + + mutex_lock(&gi->lock); + if (gi->udc_name) + unregister_gadget(gi); + cdev->os_desc_config = NULL; + WARN_ON(gi->udc_name); + mutex_unlock(&gi->lock); + return 0; +} + static struct configfs_item_operations os_desc_ops = { .release = os_desc_attr_release, .show_attribute = os_desc_attr_show, .store_attribute = os_desc_attr_store, + .allow_link = os_desc_link, + .drop_link = os_desc_unlink, }; static struct config_item_type os_desc_type = { @@ -884,6 +938,133 @@ static struct config_item_type os_desc_type = { .ct_owner = THIS_MODULE, }; +CONFIGFS_ATTR_STRUCT(usb_os_desc); +CONFIGFS_ATTR_OPS(usb_os_desc); + +static struct configfs_item_operations interf_item_ops = { + .show_attribute = usb_os_desc_attr_show, + .store_attribute = usb_os_desc_attr_store, +}; + +static ssize_t rndis_grp_compatible_id_show(struct usb_os_desc *desc, + char *page) +{ + memcpy(page, desc->ext_compat_id, 8); + return 8; +} + +static ssize_t rndis_grp_compatible_id_store(struct usb_os_desc *desc, + const char *page, size_t len) +{ + int l; + + l = min_t(int, 8, len); + if (page[l - 1] == '\n') + --l; + if (desc->opts_mutex) + mutex_lock(desc->opts_mutex); + memcpy(desc->ext_compat_id, page, l); + desc->ext_compat_id[l] = '\0'; + + if (desc->opts_mutex) + mutex_unlock(desc->opts_mutex); + + return len; +} + +static struct usb_os_desc_attribute rndis_grp_attr_compatible_id = + __CONFIGFS_ATTR(compatible_id, S_IRUGO | S_IWUSR, + rndis_grp_compatible_id_show, + rndis_grp_compatible_id_store); + +static ssize_t rndis_grp_sub_compatible_id_show(struct usb_os_desc *desc, + char *page) +{ + memcpy(page, desc->ext_compat_id + 8, 8); + return 8; +} + +static ssize_t rndis_grp_sub_compatible_id_store(struct usb_os_desc *desc, + const char *page, size_t len) +{ + int l; + + l = min_t(int, 8, len); + if (page[l - 1] == '\n') + --l; + if (desc->opts_mutex) + mutex_lock(desc->opts_mutex); + memcpy(desc->ext_compat_id + 8, page, l); + desc->ext_compat_id[l + 8] = '\0'; + + if (desc->opts_mutex) + mutex_unlock(desc->opts_mutex); + + return len; +} + +static struct usb_os_desc_attribute rndis_grp_attr_sub_compatible_id = + __CONFIGFS_ATTR(sub_compatible_id, S_IRUGO | S_IWUSR, + rndis_grp_sub_compatible_id_show, + rndis_grp_sub_compatible_id_store); + +static struct configfs_attribute *interf_grp_attrs[] = { + &rndis_grp_attr_compatible_id.attr, + &rndis_grp_attr_sub_compatible_id.attr, + NULL +}; + +int usb_os_desc_prepare_interf_dir(struct config_group *parent, + int n_interf, + struct usb_os_desc **desc, + struct module *owner) +{ + struct config_group **f_default_groups, *os_desc_group, + **interface_groups; + struct config_item_type *os_desc_type, *interface_type; + + vla_group(data_chunk); + vla_item(data_chunk, struct config_group *, f_default_groups, 2); + vla_item(data_chunk, struct config_group, os_desc_group, 1); + vla_item(data_chunk, struct config_group *, interface_groups, + n_interf + 1); + vla_item(data_chunk, struct config_item_type, os_desc_type, 1); + vla_item(data_chunk, struct config_item_type, interface_type, 1); + + char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL); + if (!vlabuf) + return -ENOMEM; + + f_default_groups = vla_ptr(vlabuf, data_chunk, f_default_groups); + os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group); + os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type); + interface_groups = vla_ptr(vlabuf, data_chunk, interface_groups); + interface_type = vla_ptr(vlabuf, data_chunk, interface_type); + + parent->default_groups = f_default_groups; + os_desc_type->ct_owner = owner; + config_group_init_type_name(os_desc_group, "os_desc", os_desc_type); + f_default_groups[0] = os_desc_group; + + os_desc_group->default_groups = interface_groups; + interface_type->ct_item_ops = &interf_item_ops; + interface_type->ct_attrs = interf_grp_attrs; + interface_type->ct_owner = owner; + + while (n_interf--) { + struct usb_os_desc *d; + + d = desc[n_interf]; + config_group_init_type_name(&d->group, "", interface_type); + config_item_set_name(&d->group.cg_item, "interface.%d", + n_interf); + interface_groups[n_interf] = &d->group; + } + + return 0; +} +EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir); + static int configfs_do_nothing(struct usb_composite_dev *cdev) { WARN_ON(1); @@ -893,6 +1074,9 @@ static int configfs_do_nothing(struct usb_composite_dev *cdev) int composite_dev_prepare(struct usb_composite_driver *composite, struct usb_composite_dev *dev); +int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, + struct usb_ep *ep0); + static void purge_configs_funcs(struct gadget_info *gi) { struct usb_configuration *c; @@ -1028,6 +1212,12 @@ static int configfs_composite_bind(struct usb_gadget *gadget, } usb_ep_autoconfig_reset(cdev->gadget); } + if (cdev->use_os_string) { + ret = composite_os_desc_req_prepare(cdev, gadget->ep0); + if (ret) + goto err_purge_funcs; + } + usb_ep_autoconfig_reset(cdev->gadget); return 0; diff --git a/drivers/usb/gadget/configfs.h b/drivers/usb/gadget/configfs.h index a7b564a913d1..a14ac792c698 100644 --- a/drivers/usb/gadget/configfs.h +++ b/drivers/usb/gadget/configfs.h @@ -1,6 +1,18 @@ #ifndef USB__GADGET__CONFIGFS__H #define USB__GADGET__CONFIGFS__H +#include <linux/configfs.h> + void unregister_gadget_item(struct config_item *item); +int usb_os_desc_prepare_interf_dir(struct config_group *parent, + int n_interf, + struct usb_os_desc **desc, + struct module *owner); + +static inline struct usb_os_desc *to_usb_os_desc(struct config_item *item) +{ + return container_of(to_config_group(item), struct usb_os_desc, group); +} + #endif /* USB__GADGET__CONFIGFS__H */ diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h index 549f5382b01a..9c3903d76781 100644 --- a/include/linux/usb/composite.h +++ b/include/linux/usb/composite.h @@ -80,12 +80,16 @@ struct usb_os_desc_ext_prop { * @ext_prop: Extended Properties list * @ext_prop_len: Total length of Extended Properties blobs * @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 */ struct usb_os_desc { char *ext_compat_id; struct list_head ext_prop; int ext_prop_len; int ext_prop_count; + struct mutex *opts_mutex; + struct config_group group; }; /** @@ -381,6 +385,8 @@ extern void usb_composite_unregister(struct usb_composite_driver *driver); extern void usb_composite_setup_continue(struct usb_composite_dev *cdev); extern int composite_dev_prepare(struct usb_composite_driver *composite, struct usb_composite_dev *cdev); +extern int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, + struct usb_ep *ep0); void composite_dev_cleanup(struct usb_composite_dev *cdev); static inline struct usb_composite_driver *to_cdriver( |