--- /dev/null
+#include <linux/configfs.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/nls.h>
+#include <linux/usb/composite.h>
+#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)
+{
+ unsigned primary_lang;
+ unsigned sub_lang;
+ u16 num;
+ int ret;
+
+ ret = kstrtou16(name, 0, &num);
+ if (ret)
+ return ret;
+
+ primary_lang = num & 0x3ff;
+ sub_lang = num >> 10;
+
+ /* simple sanity check for valid langid */
+ switch (primary_lang) {
+ case 0:
+ case 0x62 ... 0xfe:
+ case 0x100 ... 0x3ff:
+ return -EINVAL;
+ }
+ if (!sub_lang)
+ return -EINVAL;
+
+ stringtab_dev->language = num;
+ return 0;
+}
+
+#define MAX_NAME_LEN 40
+#define MAX_USB_STRING_LANGS 2
+
+struct gadget_info {
+ struct config_group group;
+ struct config_group functions_group;
+ struct config_group configs_group;
+ struct config_group strings_group;
+ struct config_group os_desc_group;
+ struct config_group *default_groups[5];
+
+ struct mutex lock;
+ struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
+ struct list_head string_list;
+ struct list_head available_func;
+
+ const char *udc_name;
+#ifdef CONFIG_USB_OTG
+ struct usb_otg_descriptor otg;
+#endif
+ struct usb_composite_driver composite;
+ struct usb_composite_dev cdev;
+ bool use_os_desc;
+ char b_vendor_code;
+ char qw_sign[OS_STRING_QW_SIGN_LEN];
+};
+
+struct config_usb_cfg {
+ struct config_group group;
+ struct config_group strings_group;
+ struct config_group *default_groups[2];
+ struct list_head string_list;
+ struct usb_configuration c;
+ struct list_head func_list;
+ struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
+};
+
+struct gadget_strings {
+ struct usb_gadget_strings stringtab_dev;
+ struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
+ char *manufacturer;
+ char *product;
+ char *serialnumber;
+
+ struct config_group group;
+ struct list_head list;
+};
+
+struct os_desc {
+ struct config_group group;
+};
+
+struct gadget_config_name {
+ struct usb_gadget_strings stringtab_dev;
+ struct usb_string strings;
+ char *configuration;
+
+ struct config_group group;
+ struct list_head list;
+};
+
+static int usb_string_copy(const char *s, char **s_copy)
+{
+ int ret;
+ char *str;
+ char *copy = *s_copy;
+ ret = strlen(s);
+ if (ret > 126)
+ return -EOVERFLOW;
+
+ str = kstrdup(s, GFP_KERNEL);
+ if (!str)
+ return -ENOMEM;
+ if (str[ret - 1] == '\n')
+ str[ret - 1] = '\0';
+ kfree(copy);
+ *s_copy = str;
+ return 0;
+}
+
+CONFIGFS_ATTR_STRUCT(gadget_info);
+CONFIGFS_ATTR_STRUCT(config_usb_cfg);
+
+#define GI_DEVICE_DESC_ITEM_ATTR(name) \
+ static struct gadget_info_attribute gadget_cdev_desc_##name = \
+ __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
+ gadget_dev_desc_##name##_show, \
+ gadget_dev_desc_##name##_store)
+
+#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
+ static ssize_t gadget_dev_desc_##__name##_show(struct gadget_info *gi, \
+ char *page) \
+{ \
+ return sprintf(page, "0x%02x\n", gi->cdev.desc.__name); \
+}
+
+#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
+ static ssize_t gadget_dev_desc_##__name##_show(struct gadget_info *gi, \
+ char *page) \
+{ \
+ return sprintf(page, "0x%04x\n", le16_to_cpup(&gi->cdev.desc.__name)); \
+}
+
+
+#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
+ static ssize_t gadget_dev_desc_##_name##_store(struct gadget_info *gi, \
+ const char *page, size_t len) \
+{ \
+ u8 val; \
+ int ret; \
+ ret = kstrtou8(page, 0, &val); \
+ if (ret) \
+ return ret; \
+ gi->cdev.desc._name = val; \
+ return len; \
+}
+
+#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
+ static ssize_t gadget_dev_desc_##_name##_store(struct gadget_info *gi, \
+ const char *page, size_t len) \
+{ \
+ u16 val; \
+ int ret; \
+ ret = kstrtou16(page, 0, &val); \
+ if (ret) \
+ return ret; \
+ gi->cdev.desc._name = cpu_to_le16p(&val); \
+ return len; \
+}
+
+#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
+ GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
+ GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
+
+GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
+GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
+GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
+GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
+GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
+GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
+GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
+GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
+
+static ssize_t is_valid_bcd(u16 bcd_val)
+{
+ if ((bcd_val & 0xf) > 9)
+ return -EINVAL;
+ if (((bcd_val >> 4) & 0xf) > 9)
+ return -EINVAL;
+ if (((bcd_val >> 8) & 0xf) > 9)
+ return -EINVAL;
+ if (((bcd_val >> 12) & 0xf) > 9)
+ return -EINVAL;
+ return 0;
+}
+
+static ssize_t gadget_dev_desc_bcdDevice_store(struct gadget_info *gi,
+ const char *page, size_t len)
+{
+ u16 bcdDevice;
+ int ret;
+
+ ret = kstrtou16(page, 0, &bcdDevice);
+ if (ret)
+ return ret;
+ ret = is_valid_bcd(bcdDevice);
+ if (ret)
+ return ret;
+
+ gi->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
+ return len;
+}
+
+static ssize_t gadget_dev_desc_bcdUSB_store(struct gadget_info *gi,
+ const char *page, size_t len)
+{
+ u16 bcdUSB;
+ int ret;
+
+ ret = kstrtou16(page, 0, &bcdUSB);
+ if (ret)
+ return ret;
+ ret = is_valid_bcd(bcdUSB);
+ if (ret)
+ return ret;
+
+ gi->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
+ return len;
+}
+
+static ssize_t gadget_dev_desc_UDC_show(struct gadget_info *gi, char *page)
+{
+ return sprintf(page, "%s\n", gi->udc_name ?: "");
+}
+
+static int unregister_gadget(struct gadget_info *gi)
+{
+ int ret;
+
+ if (!gi->udc_name)
+ return -ENODEV;
+
+ ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
+ if (ret)
+ return ret;
+ kfree(gi->udc_name);
+ gi->udc_name = NULL;
+ return 0;
+}
+
+static ssize_t gadget_dev_desc_UDC_store(struct gadget_info *gi,
+ const char *page, size_t len)
+{
+ char *name;
+ int ret;
+
+ name = kstrdup(page, GFP_KERNEL);
+ if (!name)
+ return -ENOMEM;
+ if (name[len - 1] == '\n')
+ name[len - 1] = '\0';
+
+ mutex_lock(&gi->lock);
+
+ if (!strlen(name)) {
+ ret = unregister_gadget(gi);
+ if (ret)
+ goto err;
+ } else {
+ if (gi->udc_name) {
+ ret = -EBUSY;
+ goto err;
+ }
+ ret = usb_udc_attach_driver(name, &gi->composite.gadget_driver);
+ if (ret)
+ goto err;
+ gi->udc_name = name;
+ }
+ mutex_unlock(&gi->lock);
+ return len;
+err:
+ kfree(name);
+ mutex_unlock(&gi->lock);
+ return ret;
+}
+
+GI_DEVICE_DESC_ITEM_ATTR(bDeviceClass);
+GI_DEVICE_DESC_ITEM_ATTR(bDeviceSubClass);
+GI_DEVICE_DESC_ITEM_ATTR(bDeviceProtocol);
+GI_DEVICE_DESC_ITEM_ATTR(bMaxPacketSize0);
+GI_DEVICE_DESC_ITEM_ATTR(idVendor);
+GI_DEVICE_DESC_ITEM_ATTR(idProduct);
+GI_DEVICE_DESC_ITEM_ATTR(bcdDevice);
+GI_DEVICE_DESC_ITEM_ATTR(bcdUSB);
+GI_DEVICE_DESC_ITEM_ATTR(UDC);
+
+static struct configfs_attribute *gadget_root_attrs[] = {
+ &gadget_cdev_desc_bDeviceClass.attr,
+ &gadget_cdev_desc_bDeviceSubClass.attr,
+ &gadget_cdev_desc_bDeviceProtocol.attr,
+ &gadget_cdev_desc_bMaxPacketSize0.attr,
+ &gadget_cdev_desc_idVendor.attr,
+ &gadget_cdev_desc_idProduct.attr,
+ &gadget_cdev_desc_bcdDevice.attr,
+ &gadget_cdev_desc_bcdUSB.attr,
+ &gadget_cdev_desc_UDC.attr,
+ NULL,
+};
+
+static inline struct gadget_info *to_gadget_info(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct gadget_info, group);
+}
+
+static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct gadget_strings,
+ group);
+}
+
+static inline struct gadget_config_name *to_gadget_config_name(
+ struct config_item *item)
+{
+ return container_of(to_config_group(item), struct gadget_config_name,
+ group);
+}
+
+static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct config_usb_cfg,
+ group);
+}
+
+static inline struct usb_function_instance *to_usb_function_instance(
+ struct config_item *item)
+{
+ return container_of(to_config_group(item),
+ struct usb_function_instance, group);
+}
+
+static void gadget_info_attr_release(struct config_item *item)
+{
+ struct gadget_info *gi = to_gadget_info(item);
+
+ WARN_ON(!list_empty(&gi->cdev.configs));
+ WARN_ON(!list_empty(&gi->string_list));
+ WARN_ON(!list_empty(&gi->available_func));
+ kfree(gi->composite.gadget_driver.function);
+ kfree(gi);
+}
+
+CONFIGFS_ATTR_OPS(gadget_info);
+
+static struct configfs_item_operations gadget_root_item_ops = {
+ .release = gadget_info_attr_release,
+ .show_attribute = gadget_info_attr_show,
+ .store_attribute = gadget_info_attr_store,
+};
+
+static void gadget_config_attr_release(struct config_item *item)
+{
+ struct config_usb_cfg *cfg = to_config_usb_cfg(item);
+
+ WARN_ON(!list_empty(&cfg->c.functions));
+ list_del(&cfg->c.list);
+ kfree(cfg->c.label);
+ kfree(cfg);
+}
+
+static int config_usb_cfg_link(
+ struct config_item *usb_cfg_ci,
+ struct config_item *usb_func_ci)
+{
+ struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
+ struct usb_composite_dev *cdev = cfg->c.cdev;
+ struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
+
+ struct config_group *group = to_config_group(usb_func_ci);
+ struct usb_function_instance *fi = container_of(group,
+ struct usb_function_instance, group);
+ struct usb_function_instance *a_fi;
+ struct usb_function *f;
+ int ret;
+
+ mutex_lock(&gi->lock);
+ /*
+ * Make sure this function is from within our _this_ gadget and not
+ * from another gadget or a random directory.
+ * Also a function instance can only be linked once.
+ */
+ list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
+ if (a_fi == fi)
+ break;
+ }
+ if (a_fi != fi) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ list_for_each_entry(f, &cfg->func_list, list) {
+ if (f->fi == fi) {
+ ret = -EEXIST;
+ goto out;
+ }
+ }
+
+ f = usb_get_function(fi);
+ if (IS_ERR(f)) {
+ ret = PTR_ERR(f);
+ goto out;
+ }
+
+ /* stash the function until we bind it to the gadget */
+ list_add_tail(&f->list, &cfg->func_list);
+ ret = 0;
+out:
+ mutex_unlock(&gi->lock);
+ return ret;
+}
+
+static int config_usb_cfg_unlink(
+ struct config_item *usb_cfg_ci,
+ struct config_item *usb_func_ci)
+{
+ struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
+ struct usb_composite_dev *cdev = cfg->c.cdev;
+ struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
+
+ struct config_group *group = to_config_group(usb_func_ci);
+ struct usb_function_instance *fi = container_of(group,
+ struct usb_function_instance, group);
+ struct usb_function *f;
+
+ /*
+ * ideally I would like to forbid to unlink functions while a gadget is
+ * bound to an UDC. Since this isn't possible at the moment, we simply
+ * force an unbind, the function is available here and then we can
+ * remove the function.
+ */
+ mutex_lock(&gi->lock);
+ if (gi->udc_name)
+ unregister_gadget(gi);
+ WARN_ON(gi->udc_name);
+
+ list_for_each_entry(f, &cfg->func_list, list) {
+ if (f->fi == fi) {
+ list_del(&f->list);
+ usb_put_function(f);
+ mutex_unlock(&gi->lock);
+ return 0;
+ }
+ }
+ mutex_unlock(&gi->lock);
+ WARN(1, "Unable to locate function to unbind\n");
+ return 0;
+}
+
+CONFIGFS_ATTR_OPS(config_usb_cfg);
+
+static struct configfs_item_operations gadget_config_item_ops = {
+ .release = gadget_config_attr_release,
+ .show_attribute = config_usb_cfg_attr_show,
+ .store_attribute = config_usb_cfg_attr_store,
+ .allow_link = config_usb_cfg_link,
+ .drop_link = config_usb_cfg_unlink,
+};
+
+
+static ssize_t gadget_config_desc_MaxPower_show(struct config_usb_cfg *cfg,
+ char *page)
+{
+ return sprintf(page, "%u\n", cfg->c.MaxPower);
+}
+
+static ssize_t gadget_config_desc_MaxPower_store(struct config_usb_cfg *cfg,
+ const char *page, size_t len)
+{
+ u16 val;
+ int ret;
+ ret = kstrtou16(page, 0, &val);
+ if (ret)
+ return ret;
+ if (DIV_ROUND_UP(val, 8) > 0xff)
+ return -ERANGE;
+ cfg->c.MaxPower = val;
+ return len;
+}
+
+static ssize_t gadget_config_desc_bmAttributes_show(struct config_usb_cfg *cfg,
+ char *page)
+{
+ return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
+}
+
+static ssize_t gadget_config_desc_bmAttributes_store(struct config_usb_cfg *cfg,
+ const char *page, size_t len)
+{
+ u8 val;
+ int ret;
+ ret = kstrtou8(page, 0, &val);
+ if (ret)
+ return ret;
+ if (!(val & USB_CONFIG_ATT_ONE))
+ return -EINVAL;
+ if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
+ USB_CONFIG_ATT_WAKEUP))
+ return -EINVAL;
+ cfg->c.bmAttributes = val;
+ return len;
+}
+
+#define CFG_CONFIG_DESC_ITEM_ATTR(name) \
+ static struct config_usb_cfg_attribute gadget_usb_cfg_##name = \
+ __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
+ gadget_config_desc_##name##_show, \
+ gadget_config_desc_##name##_store)
+
+CFG_CONFIG_DESC_ITEM_ATTR(MaxPower);
+CFG_CONFIG_DESC_ITEM_ATTR(bmAttributes);
+
+static struct configfs_attribute *gadget_config_attrs[] = {
+ &gadget_usb_cfg_MaxPower.attr,
+ &gadget_usb_cfg_bmAttributes.attr,
+ NULL,
+};
+
+static struct config_item_type gadget_config_type = {
+ .ct_item_ops = &gadget_config_item_ops,
+ .ct_attrs = gadget_config_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_item_type gadget_root_type = {
+ .ct_item_ops = &gadget_root_item_ops,
+ .ct_attrs = gadget_root_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static void composite_init_dev(struct usb_composite_dev *cdev)
+{
+ spin_lock_init(&cdev->lock);
+ INIT_LIST_HEAD(&cdev->configs);
+ INIT_LIST_HEAD(&cdev->gstrings);
+}
+
+static struct config_group *function_make(
+ struct config_group *group,
+ const char *name)
+{
+ struct gadget_info *gi;
+ struct usb_function_instance *fi;
+ char buf[MAX_NAME_LEN];
+ char *func_name;
+ char *instance_name;
+ int ret;
+
+ ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
+ if (ret >= MAX_NAME_LEN)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ func_name = buf;
+ instance_name = strchr(func_name, '.');
+ if (!instance_name) {
+ pr_err("Unable to locate . in FUNC.INSTANCE\n");
+ return ERR_PTR(-EINVAL);
+ }
+ *instance_name = '\0';
+ instance_name++;
+
+ fi = usb_get_function_instance(func_name);
+ if (IS_ERR(fi))
+ return ERR_CAST(fi);
+
+ ret = config_item_set_name(&fi->group.cg_item, name);
+ if (ret) {
+ usb_put_function_instance(fi);
+ return ERR_PTR(ret);
+ }
+ if (fi->set_inst_name) {
+ ret = fi->set_inst_name(fi, instance_name);
+ if (ret) {
+ usb_put_function_instance(fi);
+ return ERR_PTR(ret);
+ }
+ }
+
+ gi = container_of(group, struct gadget_info, functions_group);
+
+ mutex_lock(&gi->lock);
+ list_add_tail(&fi->cfs_list, &gi->available_func);
+ mutex_unlock(&gi->lock);
+ return &fi->group;
+}
+
+static void function_drop(
+ struct config_group *group,
+ struct config_item *item)
+{
+ struct usb_function_instance *fi = to_usb_function_instance(item);
+ struct gadget_info *gi;
+
+ gi = container_of(group, struct gadget_info, functions_group);
+
+ mutex_lock(&gi->lock);
+ list_del(&fi->cfs_list);
+ mutex_unlock(&gi->lock);
+ config_item_put(item);
+}
+
+static struct configfs_group_operations functions_ops = {
+ .make_group = &function_make,
+ .drop_item = &function_drop,
+};
+
+static struct config_item_type functions_type = {
+ .ct_group_ops = &functions_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+CONFIGFS_ATTR_STRUCT(gadget_config_name);
+GS_STRINGS_RW(gadget_config_name, configuration);
+
+static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
+ &gadget_config_name_configuration.attr,
+ NULL,
+};
+
+static void gadget_config_name_attr_release(struct config_item *item)
+{
+ struct gadget_config_name *cn = to_gadget_config_name(item);
+
+ kfree(cn->configuration);
+
+ list_del(&cn->list);
+ kfree(cn);
+}
+
+USB_CONFIG_STRING_RW_OPS(gadget_config_name);
+USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
+
+static struct config_group *config_desc_make(
+ struct config_group *group,
+ const char *name)
+{
+ struct gadget_info *gi;
+ struct config_usb_cfg *cfg;
+ char buf[MAX_NAME_LEN];
+ char *num_str;
+ u8 num;
+ int ret;
+
+ gi = container_of(group, struct gadget_info, configs_group);
+ ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
+ if (ret >= MAX_NAME_LEN)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ num_str = strchr(buf, '.');
+ if (!num_str) {
+ pr_err("Unable to locate . in name.bConfigurationValue\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ *num_str = '\0';
+ num_str++;
+
+ if (!strlen(buf))
+ return ERR_PTR(-EINVAL);
+
+ ret = kstrtou8(num_str, 0, &num);
+ if (ret)
+ return ERR_PTR(ret);
+
+ cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg)
+ return ERR_PTR(-ENOMEM);
+ cfg->c.label = kstrdup(buf, GFP_KERNEL);
+ if (!cfg->c.label) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ cfg->c.bConfigurationValue = num;
+ cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
+ cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
+ INIT_LIST_HEAD(&cfg->string_list);
+ INIT_LIST_HEAD(&cfg->func_list);
+
+ cfg->group.default_groups = cfg->default_groups;
+ cfg->default_groups[0] = &cfg->strings_group;
+
+ config_group_init_type_name(&cfg->group, name,
+ &gadget_config_type);
+ config_group_init_type_name(&cfg->strings_group, "strings",
+ &gadget_config_name_strings_type);
+
+ ret = usb_add_config_only(&gi->cdev, &cfg->c);
+ if (ret)
+ goto err;
+
+ return &cfg->group;
+err:
+ kfree(cfg->c.label);
+ kfree(cfg);
+ return ERR_PTR(ret);
+}
+
+static void config_desc_drop(
+ struct config_group *group,
+ struct config_item *item)
+{
+ config_item_put(item);
+}
+
+static struct configfs_group_operations config_desc_ops = {
+ .make_group = &config_desc_make,
+ .drop_item = &config_desc_drop,
+};
+
+static struct config_item_type config_desc_type = {
+ .ct_group_ops = &config_desc_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+CONFIGFS_ATTR_STRUCT(gadget_strings);
+GS_STRINGS_RW(gadget_strings, manufacturer);
+GS_STRINGS_RW(gadget_strings, product);
+GS_STRINGS_RW(gadget_strings, serialnumber);
+
+static struct configfs_attribute *gadget_strings_langid_attrs[] = {
+ &gadget_strings_manufacturer.attr,
+ &gadget_strings_product.attr,
+ &gadget_strings_serialnumber.attr,
+ NULL,
+};
+
+static void gadget_strings_attr_release(struct config_item *item)
+{
+ struct gadget_strings *gs = to_gadget_strings(item);
+
+ kfree(gs->manufacturer);
+ kfree(gs->product);
+ kfree(gs->serialnumber);
+
+ list_del(&gs->list);
+ kfree(gs);
+}
+
+USB_CONFIG_STRING_RW_OPS(gadget_strings);
+USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
+
+static inline struct os_desc *to_os_desc(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct os_desc, group);
+}
+
+CONFIGFS_ATTR_STRUCT(os_desc);
+CONFIGFS_ATTR_OPS(os_desc);
+
+static ssize_t os_desc_use_show(struct os_desc *os_desc, char *page)
+{
+ struct gadget_info *gi;
+
+ gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
+
+ return sprintf(page, "%d", gi->use_os_desc);
+}
+
+static ssize_t os_desc_use_store(struct os_desc *os_desc, const char *page,
+ size_t len)
+{
+ struct gadget_info *gi;
+ int ret;
+ bool use;
+
+ gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
+
+ mutex_lock(&gi->lock);
+ ret = strtobool(page, &use);
+ if (!ret) {
+ gi->use_os_desc = use;
+ ret = len;
+ }
+ mutex_unlock(&gi->lock);
+
+ return ret;
+}
+
+static struct os_desc_attribute os_desc_use =
+ __CONFIGFS_ATTR(use, S_IRUGO | S_IWUSR,
+ os_desc_use_show,
+ os_desc_use_store);
+
+static ssize_t os_desc_b_vendor_code_show(struct os_desc *os_desc, char *page)
+{
+ struct gadget_info *gi;
+
+ gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
+
+ return sprintf(page, "%d", gi->b_vendor_code);
+}
+
+static ssize_t os_desc_b_vendor_code_store(struct os_desc *os_desc,
+ const char *page, size_t len)
+{
+ struct gadget_info *gi;
+ int ret;
+ u8 b_vendor_code;
+
+ gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
+
+ mutex_lock(&gi->lock);
+ ret = kstrtou8(page, 0, &b_vendor_code);
+ if (!ret) {
+ gi->b_vendor_code = b_vendor_code;
+ ret = len;
+ }
+ mutex_unlock(&gi->lock);
+
+ return ret;
+}
+
+static struct os_desc_attribute os_desc_b_vendor_code =
+ __CONFIGFS_ATTR(b_vendor_code, S_IRUGO | S_IWUSR,
+ os_desc_b_vendor_code_show,
+ os_desc_b_vendor_code_store);
+
+static ssize_t os_desc_qw_sign_show(struct os_desc *os_desc, char *page)
+{
+ struct gadget_info *gi;
+
+ gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
+
+ memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
+
+ return OS_STRING_QW_SIGN_LEN;
+}
+
+static ssize_t os_desc_qw_sign_store(struct os_desc *os_desc, const char *page,
+ size_t len)
+{
+ struct gadget_info *gi;
+ int res, l;
+
+ gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
+ l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
+ if (page[l - 1] == '\n')
+ --l;
+
+ mutex_lock(&gi->lock);
+ res = utf8s_to_utf16s(page, l,
+ UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
+ OS_STRING_QW_SIGN_LEN);
+ if (res > 0)
+ res = len;
+ mutex_unlock(&gi->lock);
+
+ return res;
+}
+
+static struct os_desc_attribute os_desc_qw_sign =
+ __CONFIGFS_ATTR(qw_sign, S_IRUGO | S_IWUSR,
+ os_desc_qw_sign_show,
+ os_desc_qw_sign_store);
+
+static struct configfs_attribute *os_desc_attrs[] = {
+ &os_desc_use.attr,
+ &os_desc_b_vendor_code.attr,
+ &os_desc_qw_sign.attr,
+ NULL,
+};
+
+static void os_desc_attr_release(struct config_item *item)
+{
+ struct os_desc *os_desc = to_os_desc(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 = {
+ .ct_item_ops = &os_desc_ops,
+ .ct_attrs = os_desc_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+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 = kmemdup(page, len, GFP_KERNEL);
+ if (!new_data)
+ return -ENOMEM;
+
+ 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,
+};
+
+static ssize_t interf_grp_compatible_id_show(struct usb_os_desc *desc,
+ char *page)
+{
+ memcpy(page, desc->ext_compat_id, 8);
+ return 8;
+}
+
+static ssize_t interf_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);
+
+ if (desc->opts_mutex)
+ mutex_unlock(desc->opts_mutex);
+
+ return len;
+}
+
+static struct usb_os_desc_attribute interf_grp_attr_compatible_id =
+ __CONFIGFS_ATTR(compatible_id, S_IRUGO | S_IWUSR,
+ interf_grp_compatible_id_show,
+ interf_grp_compatible_id_store);
+
+static ssize_t interf_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 interf_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);
+
+ if (desc->opts_mutex)
+ mutex_unlock(desc->opts_mutex);
+
+ return len;
+}
+
+static struct usb_os_desc_attribute interf_grp_attr_sub_compatible_id =
+ __CONFIGFS_ATTR(sub_compatible_id, S_IRUGO | S_IWUSR,
+ interf_grp_sub_compatible_id_show,
+ interf_grp_sub_compatible_id_store);
+
+static struct configfs_attribute *interf_grp_attrs[] = {
+ &interf_grp_attr_compatible_id.attr,
+ &interf_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,
+ char **names,
+ 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_group_ops = &interf_grp_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];
+ d->owner = owner;
+ config_group_init_type_name(&d->group, "", interface_type);
+ config_item_set_name(&d->group.cg_item, "interface.%s",
+ names[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);
+ return -EINVAL;
+}
+
+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;
+
+ list_for_each_entry(c, &gi->cdev.configs, list) {
+ struct usb_function *f, *tmp;
+ struct config_usb_cfg *cfg;
+
+ cfg = container_of(c, struct config_usb_cfg, c);
+
+ list_for_each_entry_safe(f, tmp, &c->functions, list) {
+
+ list_move_tail(&f->list, &cfg->func_list);
+ if (f->unbind) {
+ dev_err(&gi->cdev.gadget->dev, "unbind function"
+ " '%s'/%p\n", f->name, f);
+ f->unbind(c, f);
+ }
+ }
+ c->next_interface_id = 0;
+ memset(c->interface, 0, sizeof(c->interface));
+ c->superspeed = 0;
+ c->highspeed = 0;
+ c->fullspeed = 0;
+ }
+}
+
+static int configfs_composite_bind(struct usb_gadget *gadget,
+ struct usb_gadget_driver *gdriver)
+{
+ struct usb_composite_driver *composite = to_cdriver(gdriver);
+ struct gadget_info *gi = container_of(composite,
+ struct gadget_info, composite);
+ struct usb_composite_dev *cdev = &gi->cdev;
+ struct usb_configuration *c;
+ struct usb_string *s;
+ unsigned i;
+ int ret;
+
+ /* the gi->lock is hold by the caller */
+ cdev->gadget = gadget;
+ set_gadget_data(gadget, cdev);
+ ret = composite_dev_prepare(composite, cdev);
+ if (ret)
+ return ret;
+ /* and now the gadget bind */
+ ret = -EINVAL;
+
+ if (list_empty(&gi->cdev.configs)) {
+ pr_err("Need at least one configuration in %s.\n",
+ gi->composite.name);
+ goto err_comp_cleanup;
+ }
+
+
+ list_for_each_entry(c, &gi->cdev.configs, list) {
+ struct config_usb_cfg *cfg;
+
+ cfg = container_of(c, struct config_usb_cfg, c);
+ if (list_empty(&cfg->func_list)) {
+ pr_err("Config %s/%d of %s needs at least one function.\n",
+ c->label, c->bConfigurationValue,
+ gi->composite.name);
+ goto err_comp_cleanup;
+ }
+ }
+
+ /* init all strings */
+ if (!list_empty(&gi->string_list)) {
+ struct gadget_strings *gs;
+
+ i = 0;
+ list_for_each_entry(gs, &gi->string_list, list) {
+
+ gi->gstrings[i] = &gs->stringtab_dev;
+ gs->stringtab_dev.strings = gs->strings;
+ gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
+ gs->manufacturer;
+ gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
+ gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
+ i++;
+ }
+ gi->gstrings[i] = NULL;
+ s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
+ USB_GADGET_FIRST_AVAIL_IDX);
+ if (IS_ERR(s)) {
+ ret = PTR_ERR(s);
+ goto err_comp_cleanup;
+ }
+
+ gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
+ gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
+ gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
+ }
+
+ if (gi->use_os_desc) {
+ cdev->use_os_string = true;
+ cdev->b_vendor_code = gi->b_vendor_code;
+ memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
+ }
+
+ /* Go through all configs, attach all functions */
+ list_for_each_entry(c, &gi->cdev.configs, list) {
+ struct config_usb_cfg *cfg;
+ struct usb_function *f;
+ struct usb_function *tmp;
+ struct gadget_config_name *cn;
+
+ cfg = container_of(c, struct config_usb_cfg, c);
+ if (!list_empty(&cfg->string_list)) {
+ i = 0;
+ list_for_each_entry(cn, &cfg->string_list, list) {
+ cfg->gstrings[i] = &cn->stringtab_dev;
+ cn->stringtab_dev.strings = &cn->strings;
+ cn->strings.s = cn->configuration;
+ i++;
+ }
+ cfg->gstrings[i] = NULL;
+ s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
+ if (IS_ERR(s)) {
+ ret = PTR_ERR(s);
+ goto err_comp_cleanup;
+ }
+ c->iConfiguration = s[0].id;
+ }
+
+ list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
+ list_del(&f->list);
+ ret = usb_add_function(c, f);
+ if (ret) {
+ list_add(&f->list, &cfg->func_list);
+ goto err_purge_funcs;
+ }
+ }
+ 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;
+
+err_purge_funcs:
+ purge_configs_funcs(gi);
+err_comp_cleanup:
+ composite_dev_cleanup(cdev);
+ return ret;
+}
+
+static void configfs_composite_unbind(struct usb_gadget *gadget)
+{
+ struct usb_composite_dev *cdev;
+ struct gadget_info *gi;
+
+ /* the gi->lock is hold by the caller */
+
+ cdev = get_gadget_data(gadget);
+ gi = container_of(cdev, struct gadget_info, cdev);
+
+ purge_configs_funcs(gi);
+ composite_dev_cleanup(cdev);
+ usb_ep_autoconfig_reset(cdev->gadget);
+ cdev->gadget = NULL;
+ set_gadget_data(gadget, NULL);
+}
+
+static const struct usb_gadget_driver configfs_driver_template = {
+ .bind = configfs_composite_bind,
+ .unbind = configfs_composite_unbind,
+
+ .setup = composite_setup,
+ .reset = composite_disconnect,
+ .disconnect = composite_disconnect,
+
+ .suspend = composite_suspend,
+ .resume = composite_resume,
+
+ .max_speed = USB_SPEED_SUPER,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "configfs-gadget",
+ },
+};
+
+static struct config_group *gadgets_make(
+ struct config_group *group,
+ const char *name)
+{
+ struct gadget_info *gi;
+
+ gi = kzalloc(sizeof(*gi), GFP_KERNEL);
+ if (!gi)
+ return ERR_PTR(-ENOMEM);
+
+ gi->group.default_groups = gi->default_groups;
+ gi->group.default_groups[0] = &gi->functions_group;
+ gi->group.default_groups[1] = &gi->configs_group;
+ gi->group.default_groups[2] = &gi->strings_group;
+ gi->group.default_groups[3] = &gi->os_desc_group;
+
+ config_group_init_type_name(&gi->functions_group, "functions",
+ &functions_type);
+ config_group_init_type_name(&gi->configs_group, "configs",
+ &config_desc_type);
+ config_group_init_type_name(&gi->strings_group, "strings",
+ &gadget_strings_strings_type);
+ config_group_init_type_name(&gi->os_desc_group, "os_desc",
+ &os_desc_type);
+
+ gi->composite.bind = configfs_do_nothing;
+ gi->composite.unbind = configfs_do_nothing;
+ gi->composite.suspend = NULL;
+ gi->composite.resume = NULL;
+ gi->composite.max_speed = USB_SPEED_SUPER;
+
+ mutex_init(&gi->lock);
+ INIT_LIST_HEAD(&gi->string_list);
+ INIT_LIST_HEAD(&gi->available_func);
+
+ composite_init_dev(&gi->cdev);
+ gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
+ gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
+ gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
+
+ gi->composite.gadget_driver = configfs_driver_template;
+
+ gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
+ gi->composite.name = gi->composite.gadget_driver.function;
+
+ if (!gi->composite.gadget_driver.function)
+ goto err;
+
+#ifdef CONFIG_USB_OTG
+ gi->otg.bLength = sizeof(struct usb_otg_descriptor);
+ gi->otg.bDescriptorType = USB_DT_OTG;
+ gi->otg.bmAttributes = USB_OTG_SRP | USB_OTG_HNP;
+#endif
+
+ config_group_init_type_name(&gi->group, name,
+ &gadget_root_type);
+ return &gi->group;
+err:
+ kfree(gi);
+ return ERR_PTR(-ENOMEM);
+}
+
+static void gadgets_drop(struct config_group *group, struct config_item *item)
+{
+ config_item_put(item);
+}
+
+static struct configfs_group_operations gadgets_ops = {
+ .make_group = &gadgets_make,
+ .drop_item = &gadgets_drop,
+};
+
+static struct config_item_type gadgets_type = {
+ .ct_group_ops = &gadgets_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct configfs_subsystem gadget_subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "usb_gadget",
+ .ci_type = &gadgets_type,
+ },
+ },
+ .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
+};
+
+void unregister_gadget_item(struct config_item *item)
+{
+ struct gadget_info *gi = to_gadget_info(item);
+
+ unregister_gadget(gi);
+}
+EXPORT_SYMBOL_GPL(unregister_gadget_item);
+
+static int __init gadget_cfs_init(void)
+{
+ int ret;
+
+ config_group_init(&gadget_subsys.su_group);
+
+ ret = configfs_register_subsystem(&gadget_subsys);
+ return ret;
+}
+module_init(gadget_cfs_init);
+
+static void __exit gadget_cfs_exit(void)
+{
+ configfs_unregister_subsystem(&gadget_subsys);
+}
+module_exit(gadget_cfs_exit);
Code Review / kvmfornfv.git / blobdiff