configfs.c 38.4 KB
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#include <linux/configfs.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/device.h>
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#include <linux/nls.h>
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#include <linux/usb/composite.h>
#include <linux/usb/gadget_configfs.h>
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#include "configfs.h"
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#include "u_f.h"
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#include "u_os_desc.h"
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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;
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	struct config_group os_desc_group;
	struct config_group *default_groups[5];
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	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;
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	bool use_os_desc;
	char b_vendor_code;
	char qw_sign[OS_STRING_QW_SIGN_LEN];
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};

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;
};

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struct os_desc {
	struct config_group group;
};

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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 = 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);
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	WARN(1, "Unable to locate function to unbind\n");
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	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))
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		return ERR_CAST(fi);
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	ret = config_item_set_name(&fi->group.cg_item, name);
	if (ret) {
		usb_put_function_instance(fi);
		return ERR_PTR(ret);
	}
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	if (fi->set_inst_name) {
		ret = fi->set_inst_name(fi, instance_name);
		if (ret) {
			usb_put_function_instance(fi);
			return ERR_PTR(ret);
		}
	}
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	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);

750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876
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);
}

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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;
}

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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,
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	.allow_link		= os_desc_link,
	.drop_link		= os_desc_unlink,
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};

static struct config_item_type os_desc_type = {
	.ct_item_ops	= &os_desc_ops,
	.ct_attrs	= os_desc_attrs,
	.ct_owner	= THIS_MODULE,
};

942 943 944
CONFIGFS_ATTR_STRUCT(usb_os_desc);
CONFIGFS_ATTR_OPS(usb_os_desc);

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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,
};

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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;
1250
	interface_type->ct_group_ops = &interf_grp_ops;
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	interface_type->ct_attrs = interf_grp_attrs;
	interface_type->ct_owner = owner;

	while (n_interf--) {
		struct usb_os_desc *d;

		d = desc[n_interf];
1258
		d->owner = owner;
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		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);

1269 1270
static int configfs_do_nothing(struct usb_composite_dev *cdev)
{
1271
	WARN_ON(1);
1272 1273 1274 1275 1276 1277
	return -EINVAL;
}

int composite_dev_prepare(struct usb_composite_driver *composite,
		struct usb_composite_dev *dev);

1278 1279 1280
int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
				  struct usb_ep *ep0);

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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;
		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)) {
P
Peter Chen 已提交
1329
		pr_err("Need at least one configuration in %s.\n",
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339
				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)) {
P
Peter Chen 已提交
1340
			pr_err("Config %s/%d of %s needs at least one function.\n",
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			      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);
1365 1366
		if (IS_ERR(s)) {
			ret = PTR_ERR(s);
1367
			goto err_comp_cleanup;
1368
		}
1369 1370 1371 1372 1373 1374

		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;
	}

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	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);
	}

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	/* 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);
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			if (IS_ERR(s)) {
				ret = PTR_ERR(s);
1401
				goto err_comp_cleanup;
1402
			}
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			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);
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			if (ret) {
				list_add(&f->list, &cfg->func_list);
1411
				goto err_purge_funcs;
1412
			}
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		}
		usb_ep_autoconfig_reset(cdev->gadget);
	}
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	if (cdev->use_os_string) {
		ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
		if (ret)
			goto err_purge_funcs;
	}

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	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,
	.disconnect     = composite_disconnect,

	.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;
1477
	gi->group.default_groups[3] = &gi->os_desc_group;
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	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);
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	config_group_init_type_name(&gi->os_desc_group, "os_desc",
			&os_desc_type);
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	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),
};

1550 1551 1552 1553 1554 1555
void unregister_gadget_item(struct config_item *item)
{
	struct gadget_info *gi = to_gadget_info(item);

	unregister_gadget(gi);
}
1556
EXPORT_SYMBOL_GPL(unregister_gadget_item);
1557

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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);