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linux/drivers/usb/gadget/configfs.c
Michael Grzeschik d9c61bb33f usb: gadget: function: move u_f.h to include/linux/usb/func_utils.h
We move the func_utils.h header to include/linux/usb to be
able to compile function drivers outside of the
drivers/usb/gadget/function directory.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20240116-ml-topic-u9p-v12-1-9a27de5160e0@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-09-03 09:57:08 +02:00

2100 lines
51 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/configfs.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/kstrtox.h>
#include <linux/nls.h>
#include <linux/usb/composite.h>
#include <linux/usb/func_utils.h>
#include <linux/usb/gadget_configfs.h>
#include <linux/usb/webusb.h>
#include "configfs.h"
#include "u_os_desc.h"
static int check_user_usb_string(const char *name,
struct usb_gadget_strings *stringtab_dev)
{
u16 num;
int ret;
ret = kstrtou16(name, 0, &num);
if (ret)
return ret;
if (!usb_validate_langid(num))
return -EINVAL;
stringtab_dev->language = num;
return 0;
}
#define MAX_NAME_LEN 40
#define MAX_USB_STRING_LANGS 2
static const struct usb_descriptor_header *otg_desc[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 webusb_group;
struct mutex lock;
struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
struct list_head string_list;
struct list_head available_func;
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];
bool use_webusb;
u16 bcd_webusb_version;
u8 b_webusb_vendor_code;
char landing_page[WEBUSB_URL_RAW_MAX_LENGTH];
spinlock_t spinlock;
bool unbind;
};
static inline struct gadget_info *to_gadget_info(struct config_item *item)
{
return container_of(to_config_group(item), struct gadget_info, group);
}
struct config_usb_cfg {
struct config_group group;
struct config_group strings_group;
struct list_head string_list;
struct usb_configuration c;
struct list_head func_list;
struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
};
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 gadget_info *cfg_to_gadget_info(struct config_usb_cfg *cfg)
{
return container_of(cfg->c.cdev, struct gadget_info, cdev);
}
struct gadget_language {
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 list_head gadget_strings;
unsigned int nstrings;
};
struct gadget_config_name {
struct usb_gadget_strings stringtab_dev;
struct usb_string strings;
char *configuration;
struct config_group group;
struct list_head list;
};
#define USB_MAX_STRING_WITH_NULL_LEN (USB_MAX_STRING_LEN+1)
static int usb_string_copy(const char *s, char **s_copy)
{
int ret;
char *str;
char *copy = *s_copy;
ret = strlen(s);
if (ret > USB_MAX_STRING_LEN)
return -EOVERFLOW;
if (ret < 1)
return -EINVAL;
if (copy) {
str = copy;
} else {
str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
if (!str)
return -ENOMEM;
}
strcpy(str, s);
if (str[ret - 1] == '\n')
str[ret - 1] = '\0';
*s_copy = str;
return 0;
}
#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
char *page) \
{ \
return sprintf(page, "0x%02x\n", \
to_gadget_info(item)->cdev.desc.__name); \
}
#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
char *page) \
{ \
return sprintf(page, "0x%04x\n", \
le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
}
#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
u8 val; \
int ret; \
ret = kstrtou8(page, 0, &val); \
if (ret) \
return ret; \
to_gadget_info(item)->cdev.desc._name = val; \
return len; \
}
#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
u16 val; \
int ret; \
ret = kstrtou16(page, 0, &val); \
if (ret) \
return ret; \
to_gadget_info(item)->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 config_item *item,
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;
to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
return len;
}
static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
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;
to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
return len;
}
static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
{
struct gadget_info *gi = to_gadget_info(item);
char *udc_name;
int ret;
mutex_lock(&gi->lock);
udc_name = gi->composite.gadget_driver.udc_name;
ret = sprintf(page, "%s\n", udc_name ?: "");
mutex_unlock(&gi->lock);
return ret;
}
static int unregister_gadget(struct gadget_info *gi)
{
int ret;
if (!gi->composite.gadget_driver.udc_name)
return -ENODEV;
ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
if (ret)
return ret;
kfree(gi->composite.gadget_driver.udc_name);
gi->composite.gadget_driver.udc_name = NULL;
return 0;
}
static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
const char *page, size_t len)
{
struct gadget_info *gi = to_gadget_info(item);
char *name;
int ret;
if (strlen(page) < len)
return -EOVERFLOW;
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;
kfree(name);
} else {
if (gi->composite.gadget_driver.udc_name) {
ret = -EBUSY;
goto err;
}
gi->composite.gadget_driver.udc_name = name;
ret = usb_gadget_register_driver(&gi->composite.gadget_driver);
if (ret) {
gi->composite.gadget_driver.udc_name = NULL;
goto err;
}
}
mutex_unlock(&gi->lock);
return len;
err:
kfree(name);
mutex_unlock(&gi->lock);
return ret;
}
static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
char *page)
{
enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
return sprintf(page, "%s\n", usb_speed_string(speed));
}
static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
const char *page, size_t len)
{
struct gadget_info *gi = to_gadget_info(item);
mutex_lock(&gi->lock);
/* Prevent changing of max_speed after the driver is binded */
if (gi->composite.gadget_driver.udc_name)
goto err;
if (strncmp(page, "super-speed-plus", 16) == 0)
gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
else if (strncmp(page, "super-speed", 11) == 0)
gi->composite.max_speed = USB_SPEED_SUPER;
else if (strncmp(page, "high-speed", 10) == 0)
gi->composite.max_speed = USB_SPEED_HIGH;
else if (strncmp(page, "full-speed", 10) == 0)
gi->composite.max_speed = USB_SPEED_FULL;
else if (strncmp(page, "low-speed", 9) == 0)
gi->composite.max_speed = USB_SPEED_LOW;
else
goto err;
gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
mutex_unlock(&gi->lock);
return len;
err:
mutex_unlock(&gi->lock);
return -EINVAL;
}
CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
CONFIGFS_ATTR(gadget_dev_desc_, UDC);
CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
static struct configfs_attribute *gadget_root_attrs[] = {
&gadget_dev_desc_attr_bDeviceClass,
&gadget_dev_desc_attr_bDeviceSubClass,
&gadget_dev_desc_attr_bDeviceProtocol,
&gadget_dev_desc_attr_bMaxPacketSize0,
&gadget_dev_desc_attr_idVendor,
&gadget_dev_desc_attr_idProduct,
&gadget_dev_desc_attr_bcdDevice,
&gadget_dev_desc_attr_bcdUSB,
&gadget_dev_desc_attr_UDC,
&gadget_dev_desc_attr_max_speed,
NULL,
};
static inline struct gadget_language *to_gadget_language(struct config_item *item)
{
return container_of(to_config_group(item), struct gadget_language,
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 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->composite.gadget_driver.driver.name);
kfree(gi);
}
static struct configfs_item_operations gadget_root_item_ops = {
.release = gadget_info_attr_release,
};
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 gadget_info *gi = cfg_to_gadget_info(cfg);
struct usb_function_instance *fi =
to_usb_function_instance(usb_func_ci);
struct usb_function_instance *a_fi = NULL, *iter;
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.
*/
if (gi->composite.gadget_driver.udc_name) {
ret = -EINVAL;
goto out;
}
list_for_each_entry(iter, &gi->available_func, cfs_list) {
if (iter != fi)
continue;
a_fi = iter;
break;
}
if (!a_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 void 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 gadget_info *gi = cfg_to_gadget_info(cfg);
struct usb_function_instance *fi =
to_usb_function_instance(usb_func_ci);
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->composite.gadget_driver.udc_name)
unregister_gadget(gi);
WARN_ON(gi->composite.gadget_driver.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;
}
}
mutex_unlock(&gi->lock);
WARN(1, "Unable to locate function to unbind\n");
}
static struct configfs_item_operations gadget_config_item_ops = {
.release = gadget_config_attr_release,
.allow_link = config_usb_cfg_link,
.drop_link = config_usb_cfg_unlink,
};
static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
char *page)
{
struct config_usb_cfg *cfg = to_config_usb_cfg(item);
return sprintf(page, "%u\n", cfg->c.MaxPower);
}
static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
const char *page, size_t len)
{
struct config_usb_cfg *cfg = to_config_usb_cfg(item);
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_item *item,
char *page)
{
struct config_usb_cfg *cfg = to_config_usb_cfg(item);
return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
}
static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
const char *page, size_t len)
{
struct config_usb_cfg *cfg = to_config_usb_cfg(item);
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;
}
CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
static struct configfs_attribute *gadget_config_attrs[] = {
&gadget_config_desc_attr_MaxPower,
&gadget_config_desc_attr_bmAttributes,
NULL,
};
static const struct config_item_type gadget_config_type = {
.ct_item_ops = &gadget_config_item_ops,
.ct_attrs = gadget_config_attrs,
.ct_owner = THIS_MODULE,
};
static const 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;
if (strlen(name) >= MAX_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
scnprintf(buf, MAX_NAME_LEN, "%s", name);
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, "%s", 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 const struct config_item_type functions_type = {
.ct_group_ops = &functions_ops,
.ct_owner = THIS_MODULE,
};
GS_STRINGS_RW(gadget_config_name, configuration);
static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
&gadget_config_name_attr_configuration,
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);
if (strlen(name) >= MAX_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
scnprintf(buf, MAX_NAME_LEN, "%s", name);
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);
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);
configfs_add_default_group(&cfg->strings_group, &cfg->group);
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 const struct config_item_type config_desc_type = {
.ct_group_ops = &config_desc_ops,
.ct_owner = THIS_MODULE,
};
GS_STRINGS_RW(gadget_language, manufacturer);
GS_STRINGS_RW(gadget_language, product);
GS_STRINGS_RW(gadget_language, serialnumber);
static struct configfs_attribute *gadget_language_langid_attrs[] = {
&gadget_language_attr_manufacturer,
&gadget_language_attr_product,
&gadget_language_attr_serialnumber,
NULL,
};
static void gadget_language_attr_release(struct config_item *item)
{
struct gadget_language *gs = to_gadget_language(item);
kfree(gs->manufacturer);
kfree(gs->product);
kfree(gs->serialnumber);
list_del(&gs->list);
kfree(gs);
}
static struct configfs_item_operations gadget_language_langid_item_ops = {
.release = gadget_language_attr_release,
};
static ssize_t gadget_string_id_show(struct config_item *item, char *page)
{
struct gadget_string *string = to_gadget_string(item);
int ret;
ret = sprintf(page, "%u\n", string->usb_string.id);
return ret;
}
CONFIGFS_ATTR_RO(gadget_string_, id);
static ssize_t gadget_string_s_show(struct config_item *item, char *page)
{
struct gadget_string *string = to_gadget_string(item);
int ret;
ret = sysfs_emit(page, "%s\n", string->string);
return ret;
}
static ssize_t gadget_string_s_store(struct config_item *item, const char *page,
size_t len)
{
struct gadget_string *string = to_gadget_string(item);
int size = min(sizeof(string->string), len + 1);
if (len > USB_MAX_STRING_LEN)
return -EINVAL;
return strscpy(string->string, page, size);
}
CONFIGFS_ATTR(gadget_string_, s);
static struct configfs_attribute *gadget_string_attrs[] = {
&gadget_string_attr_id,
&gadget_string_attr_s,
NULL,
};
static void gadget_string_release(struct config_item *item)
{
struct gadget_string *string = to_gadget_string(item);
kfree(string);
}
static struct configfs_item_operations gadget_string_item_ops = {
.release = gadget_string_release,
};
static const struct config_item_type gadget_string_type = {
.ct_item_ops = &gadget_string_item_ops,
.ct_attrs = gadget_string_attrs,
.ct_owner = THIS_MODULE,
};
static struct config_item *gadget_language_string_make(struct config_group *group,
const char *name)
{
struct gadget_language *language;
struct gadget_string *string;
language = to_gadget_language(&group->cg_item);
string = kzalloc(sizeof(*string), GFP_KERNEL);
if (!string)
return ERR_PTR(-ENOMEM);
string->usb_string.id = language->nstrings++;
string->usb_string.s = string->string;
list_add_tail(&string->list, &language->gadget_strings);
config_item_init_type_name(&string->item, name, &gadget_string_type);
return &string->item;
}
static void gadget_language_string_drop(struct config_group *group,
struct config_item *item)
{
struct gadget_language *language;
struct gadget_string *string;
unsigned int i = USB_GADGET_FIRST_AVAIL_IDX;
language = to_gadget_language(&group->cg_item);
string = to_gadget_string(item);
list_del(&string->list);
language->nstrings--;
/* Reset the ids for the language's strings to guarantee a continuous set */
list_for_each_entry(string, &language->gadget_strings, list)
string->usb_string.id = i++;
}
static struct configfs_group_operations gadget_language_langid_group_ops = {
.make_item = gadget_language_string_make,
.drop_item = gadget_language_string_drop,
};
static const struct config_item_type gadget_language_type = {
.ct_item_ops = &gadget_language_langid_item_ops,
.ct_group_ops = &gadget_language_langid_group_ops,
.ct_attrs = gadget_language_langid_attrs,
.ct_owner = THIS_MODULE,
};
static struct config_group *gadget_language_make(struct config_group *group,
const char *name)
{
struct gadget_info *gi;
struct gadget_language *gs;
struct gadget_language *new;
int langs = 0;
int ret;
new = kzalloc(sizeof(*new), GFP_KERNEL);
if (!new)
return ERR_PTR(-ENOMEM);
ret = check_user_usb_string(name, &new->stringtab_dev);
if (ret)
goto err;
config_group_init_type_name(&new->group, name,
&gadget_language_type);
gi = container_of(group, struct gadget_info, strings_group);
ret = -EEXIST;
list_for_each_entry(gs, &gi->string_list, list) {
if (gs->stringtab_dev.language == new->stringtab_dev.language)
goto err;
langs++;
}
ret = -EOVERFLOW;
if (langs >= MAX_USB_STRING_LANGS)
goto err;
list_add_tail(&new->list, &gi->string_list);
INIT_LIST_HEAD(&new->gadget_strings);
/* We have the default manufacturer, product and serialnumber strings */
new->nstrings = 3;
return &new->group;
err:
kfree(new);
return ERR_PTR(ret);
}
static void gadget_language_drop(struct config_group *group,
struct config_item *item)
{
config_item_put(item);
}
static struct configfs_group_operations gadget_language_group_ops = {
.make_group = &gadget_language_make,
.drop_item = &gadget_language_drop,
};
static const struct config_item_type gadget_language_strings_type = {
.ct_group_ops = &gadget_language_group_ops,
.ct_owner = THIS_MODULE,
};
static inline struct gadget_info *webusb_item_to_gadget_info(
struct config_item *item)
{
return container_of(to_config_group(item),
struct gadget_info, webusb_group);
}
static ssize_t webusb_use_show(struct config_item *item, char *page)
{
return sysfs_emit(page, "%d\n",
webusb_item_to_gadget_info(item)->use_webusb);
}
static ssize_t webusb_use_store(struct config_item *item, const char *page,
size_t len)
{
struct gadget_info *gi = webusb_item_to_gadget_info(item);
int ret;
bool use;
ret = kstrtobool(page, &use);
if (ret)
return ret;
mutex_lock(&gi->lock);
gi->use_webusb = use;
mutex_unlock(&gi->lock);
return len;
}
static ssize_t webusb_bcdVersion_show(struct config_item *item, char *page)
{
return sysfs_emit(page, "0x%04x\n",
webusb_item_to_gadget_info(item)->bcd_webusb_version);
}
static ssize_t webusb_bcdVersion_store(struct config_item *item,
const char *page, size_t len)
{
struct gadget_info *gi = webusb_item_to_gadget_info(item);
u16 bcdVersion;
int ret;
ret = kstrtou16(page, 0, &bcdVersion);
if (ret)
return ret;
ret = is_valid_bcd(bcdVersion);
if (ret)
return ret;
mutex_lock(&gi->lock);
gi->bcd_webusb_version = bcdVersion;
mutex_unlock(&gi->lock);
return len;
}
static ssize_t webusb_bVendorCode_show(struct config_item *item, char *page)
{
return sysfs_emit(page, "0x%02x\n",
webusb_item_to_gadget_info(item)->b_webusb_vendor_code);
}
static ssize_t webusb_bVendorCode_store(struct config_item *item,
const char *page, size_t len)
{
struct gadget_info *gi = webusb_item_to_gadget_info(item);
int ret;
u8 b_vendor_code;
ret = kstrtou8(page, 0, &b_vendor_code);
if (ret)
return ret;
mutex_lock(&gi->lock);
gi->b_webusb_vendor_code = b_vendor_code;
mutex_unlock(&gi->lock);
return len;
}
static ssize_t webusb_landingPage_show(struct config_item *item, char *page)
{
return sysfs_emit(page, "%s\n", webusb_item_to_gadget_info(item)->landing_page);
}
static ssize_t webusb_landingPage_store(struct config_item *item, const char *page,
size_t len)
{
struct gadget_info *gi = webusb_item_to_gadget_info(item);
unsigned int bytes_to_strip = 0;
int l = len;
if (page[l - 1] == '\n') {
--l;
++bytes_to_strip;
}
if (l > sizeof(gi->landing_page)) {
pr_err("webusb: landingPage URL too long\n");
return -EINVAL;
}
// validation
if (strncasecmp(page, "https://", 8) == 0)
bytes_to_strip = 8;
else if (strncasecmp(page, "http://", 7) == 0)
bytes_to_strip = 7;
else
bytes_to_strip = 0;
if (l > U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + bytes_to_strip) {
pr_err("webusb: landingPage URL %d bytes too long for given URL scheme\n",
l - U8_MAX + WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH - bytes_to_strip);
return -EINVAL;
}
mutex_lock(&gi->lock);
// ensure 0 bytes are set, in case the new landing page is shorter then the old one.
memcpy_and_pad(gi->landing_page, sizeof(gi->landing_page), page, l, 0);
mutex_unlock(&gi->lock);
return len;
}
CONFIGFS_ATTR(webusb_, use);
CONFIGFS_ATTR(webusb_, bVendorCode);
CONFIGFS_ATTR(webusb_, bcdVersion);
CONFIGFS_ATTR(webusb_, landingPage);
static struct configfs_attribute *webusb_attrs[] = {
&webusb_attr_use,
&webusb_attr_bcdVersion,
&webusb_attr_bVendorCode,
&webusb_attr_landingPage,
NULL,
};
static const struct config_item_type webusb_type = {
.ct_attrs = webusb_attrs,
.ct_owner = THIS_MODULE,
};
static inline struct gadget_info *os_desc_item_to_gadget_info(
struct config_item *item)
{
return container_of(to_config_group(item),
struct gadget_info, os_desc_group);
}
static ssize_t os_desc_use_show(struct config_item *item, char *page)
{
return sprintf(page, "%d\n",
os_desc_item_to_gadget_info(item)->use_os_desc);
}
static ssize_t os_desc_use_store(struct config_item *item, const char *page,
size_t len)
{
struct gadget_info *gi = os_desc_item_to_gadget_info(item);
int ret;
bool use;
ret = kstrtobool(page, &use);
if (ret)
return ret;
mutex_lock(&gi->lock);
gi->use_os_desc = use;
mutex_unlock(&gi->lock);
return len;
}
static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
{
return sprintf(page, "0x%02x\n",
os_desc_item_to_gadget_info(item)->b_vendor_code);
}
static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
const char *page, size_t len)
{
struct gadget_info *gi = os_desc_item_to_gadget_info(item);
int ret;
u8 b_vendor_code;
ret = kstrtou8(page, 0, &b_vendor_code);
if (ret)
return ret;
mutex_lock(&gi->lock);
gi->b_vendor_code = b_vendor_code;
mutex_unlock(&gi->lock);
return len;
}
static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
{
struct gadget_info *gi = os_desc_item_to_gadget_info(item);
int res;
res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
page[res++] = '\n';
return res;
}
static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
size_t len)
{
struct gadget_info *gi = os_desc_item_to_gadget_info(item);
int res, l;
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;
}
CONFIGFS_ATTR(os_desc_, use);
CONFIGFS_ATTR(os_desc_, b_vendor_code);
CONFIGFS_ATTR(os_desc_, qw_sign);
static struct configfs_attribute *os_desc_attrs[] = {
&os_desc_attr_use,
&os_desc_attr_b_vendor_code,
&os_desc_attr_qw_sign,
NULL,
};
static int os_desc_link(struct config_item *os_desc_ci,
struct config_item *usb_cfg_ci)
{
struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
struct usb_composite_dev *cdev = &gi->cdev;
struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci);
struct usb_configuration *c = NULL, *iter;
int ret;
mutex_lock(&gi->lock);
list_for_each_entry(iter, &cdev->configs, list) {
if (iter != &c_target->c)
continue;
c = iter;
break;
}
if (!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 void os_desc_unlink(struct config_item *os_desc_ci,
struct config_item *usb_cfg_ci)
{
struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
struct usb_composite_dev *cdev = &gi->cdev;
mutex_lock(&gi->lock);
if (gi->composite.gadget_driver.udc_name)
unregister_gadget(gi);
cdev->os_desc_config = NULL;
WARN_ON(gi->composite.gadget_driver.udc_name);
mutex_unlock(&gi->lock);
}
static struct configfs_item_operations os_desc_ops = {
.allow_link = os_desc_link,
.drop_link = os_desc_unlink,
};
static const struct config_item_type os_desc_type = {
.ct_item_ops = &os_desc_ops,
.ct_attrs = os_desc_attrs,
.ct_owner = THIS_MODULE,
};
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);
}
static ssize_t ext_prop_type_show(struct config_item *item, char *page)
{
return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
}
static ssize_t ext_prop_type_store(struct config_item *item,
const char *page, size_t len)
{
struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
u8 type;
int ret;
ret = kstrtou8(page, 0, &type);
if (ret)
return ret;
if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI)
return -EINVAL;
if (desc->opts_mutex)
mutex_lock(desc->opts_mutex);
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;
if (desc->opts_mutex)
mutex_unlock(desc->opts_mutex);
return len;
}
static ssize_t ext_prop_data_show(struct config_item *item, char *page)
{
struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
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 config_item *item,
const char *page, size_t len)
{
struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
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;
}
CONFIGFS_ATTR(ext_prop_, type);
CONFIGFS_ATTR(ext_prop_, data);
static struct configfs_attribute *ext_prop_attrs[] = {
&ext_prop_attr_type,
&ext_prop_attr_data,
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,
};
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 ssize_t interf_grp_compatible_id_show(struct config_item *item,
char *page)
{
memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
return 8;
}
static ssize_t interf_grp_compatible_id_store(struct config_item *item,
const char *page, size_t len)
{
struct usb_os_desc *desc = to_usb_os_desc(item);
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 ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
char *page)
{
memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
return 8;
}
static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
const char *page, size_t len)
{
struct usb_os_desc *desc = to_usb_os_desc(item);
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;
}
CONFIGFS_ATTR(interf_grp_, compatible_id);
CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
static struct configfs_attribute *interf_grp_attrs[] = {
&interf_grp_attr_compatible_id,
&interf_grp_attr_sub_compatible_id,
NULL
};
struct config_group *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 *os_desc_group;
struct config_item_type *os_desc_type, *interface_type;
vla_group(data_chunk);
vla_item(data_chunk, struct config_group, os_desc_group, 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 ERR_PTR(-ENOMEM);
os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
os_desc_type->ct_owner = owner;
config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
configfs_add_default_group(os_desc_group, parent);
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]);
configfs_add_default_group(&d->group, os_desc_group);
}
return os_desc_group;
}
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_reverse(f, tmp, &c->functions, list) {
list_move(&f->list, &cfg->func_list);
if (f->unbind) {
dev_dbg(&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_plus = 0;
c->superspeed = 0;
c->highspeed = 0;
c->fullspeed = 0;
}
}
static struct usb_string *
configfs_attach_gadget_strings(struct gadget_info *gi)
{
struct usb_gadget_strings **gadget_strings;
struct gadget_language *language;
struct gadget_string *string;
unsigned int nlangs = 0;
struct list_head *iter;
struct usb_string *us;
unsigned int i = 0;
int nstrings = -1;
unsigned int j;
list_for_each(iter, &gi->string_list)
nlangs++;
/* Bail out early if no languages are configured */
if (!nlangs)
return NULL;
gadget_strings = kcalloc(nlangs + 1, /* including NULL terminator */
sizeof(struct usb_gadget_strings *), GFP_KERNEL);
if (!gadget_strings)
return ERR_PTR(-ENOMEM);
list_for_each_entry(language, &gi->string_list, list) {
struct usb_string *stringtab;
if (nstrings == -1) {
nstrings = language->nstrings;
} else if (nstrings != language->nstrings) {
pr_err("languages must contain the same number of strings\n");
us = ERR_PTR(-EINVAL);
goto cleanup;
}
stringtab = kcalloc(language->nstrings + 1, sizeof(struct usb_string),
GFP_KERNEL);
if (!stringtab) {
us = ERR_PTR(-ENOMEM);
goto cleanup;
}
stringtab[USB_GADGET_MANUFACTURER_IDX].id = USB_GADGET_MANUFACTURER_IDX;
stringtab[USB_GADGET_MANUFACTURER_IDX].s = language->manufacturer;
stringtab[USB_GADGET_PRODUCT_IDX].id = USB_GADGET_PRODUCT_IDX;
stringtab[USB_GADGET_PRODUCT_IDX].s = language->product;
stringtab[USB_GADGET_SERIAL_IDX].id = USB_GADGET_SERIAL_IDX;
stringtab[USB_GADGET_SERIAL_IDX].s = language->serialnumber;
j = USB_GADGET_FIRST_AVAIL_IDX;
list_for_each_entry(string, &language->gadget_strings, list) {
memcpy(&stringtab[j], &string->usb_string, sizeof(struct usb_string));
j++;
}
language->stringtab_dev.strings = stringtab;
gadget_strings[i] = &language->stringtab_dev;
i++;
}
us = usb_gstrings_attach(&gi->cdev, gadget_strings, nstrings);
cleanup:
list_for_each_entry(language, &gi->string_list, list) {
kfree(language->stringtab_dev.strings);
language->stringtab_dev.strings = NULL;
}
kfree(gadget_strings);
return us;
}
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 */
gi->unbind = 0;
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)) {
s = configfs_attach_gadget_strings(gi);
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;
gi->cdev.usb_strings = s;
}
if (gi->use_webusb) {
cdev->use_webusb = true;
cdev->bcd_webusb_version = gi->bcd_webusb_version;
cdev->b_webusb_vendor_code = gi->b_webusb_vendor_code;
memcpy(cdev->landing_page, gi->landing_page, WEBUSB_URL_RAW_MAX_LENGTH);
}
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);
}
if (gadget_is_otg(gadget) && !otg_desc[0]) {
struct usb_descriptor_header *usb_desc;
usb_desc = usb_otg_descriptor_alloc(gadget);
if (!usb_desc) {
ret = -ENOMEM;
goto err_comp_cleanup;
}
usb_otg_descriptor_init(gadget, usb_desc);
otg_desc[0] = usb_desc;
otg_desc[1] = NULL;
}
/* 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;
if (gadget_is_otg(gadget))
c->descriptors = otg_desc;
/* Properly configure the bmAttributes wakeup bit */
check_remote_wakeup_config(gadget, c);
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;
}
}
ret = usb_gadget_check_config(cdev->gadget);
if (ret)
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;
unsigned long flags;
/* the gi->lock is hold by the caller */
cdev = get_gadget_data(gadget);
gi = container_of(cdev, struct gadget_info, cdev);
spin_lock_irqsave(&gi->spinlock, flags);
gi->unbind = 1;
spin_unlock_irqrestore(&gi->spinlock, flags);
kfree(otg_desc[0]);
otg_desc[0] = NULL;
purge_configs_funcs(gi);
composite_dev_cleanup(cdev);
usb_ep_autoconfig_reset(cdev->gadget);
spin_lock_irqsave(&gi->spinlock, flags);
cdev->gadget = NULL;
cdev->deactivations = 0;
gadget->deactivated = false;
set_gadget_data(gadget, NULL);
spin_unlock_irqrestore(&gi->spinlock, flags);
}
static int configfs_composite_setup(struct usb_gadget *gadget,
const struct usb_ctrlrequest *ctrl)
{
struct usb_composite_dev *cdev;
struct gadget_info *gi;
unsigned long flags;
int ret;
cdev = get_gadget_data(gadget);
if (!cdev)
return 0;
gi = container_of(cdev, struct gadget_info, cdev);
spin_lock_irqsave(&gi->spinlock, flags);
cdev = get_gadget_data(gadget);
if (!cdev || gi->unbind) {
spin_unlock_irqrestore(&gi->spinlock, flags);
return 0;
}
ret = composite_setup(gadget, ctrl);
spin_unlock_irqrestore(&gi->spinlock, flags);
return ret;
}
static void configfs_composite_disconnect(struct usb_gadget *gadget)
{
struct usb_composite_dev *cdev;
struct gadget_info *gi;
unsigned long flags;
cdev = get_gadget_data(gadget);
if (!cdev)
return;
gi = container_of(cdev, struct gadget_info, cdev);
spin_lock_irqsave(&gi->spinlock, flags);
cdev = get_gadget_data(gadget);
if (!cdev || gi->unbind) {
spin_unlock_irqrestore(&gi->spinlock, flags);
return;
}
composite_disconnect(gadget);
spin_unlock_irqrestore(&gi->spinlock, flags);
}
static void configfs_composite_reset(struct usb_gadget *gadget)
{
struct usb_composite_dev *cdev;
struct gadget_info *gi;
unsigned long flags;
cdev = get_gadget_data(gadget);
if (!cdev)
return;
gi = container_of(cdev, struct gadget_info, cdev);
spin_lock_irqsave(&gi->spinlock, flags);
cdev = get_gadget_data(gadget);
if (!cdev || gi->unbind) {
spin_unlock_irqrestore(&gi->spinlock, flags);
return;
}
composite_reset(gadget);
spin_unlock_irqrestore(&gi->spinlock, flags);
}
static void configfs_composite_suspend(struct usb_gadget *gadget)
{
struct usb_composite_dev *cdev;
struct gadget_info *gi;
unsigned long flags;
cdev = get_gadget_data(gadget);
if (!cdev)
return;
gi = container_of(cdev, struct gadget_info, cdev);
spin_lock_irqsave(&gi->spinlock, flags);
cdev = get_gadget_data(gadget);
if (!cdev || gi->unbind) {
spin_unlock_irqrestore(&gi->spinlock, flags);
return;
}
composite_suspend(gadget);
spin_unlock_irqrestore(&gi->spinlock, flags);
}
static void configfs_composite_resume(struct usb_gadget *gadget)
{
struct usb_composite_dev *cdev;
struct gadget_info *gi;
unsigned long flags;
cdev = get_gadget_data(gadget);
if (!cdev)
return;
gi = container_of(cdev, struct gadget_info, cdev);
spin_lock_irqsave(&gi->spinlock, flags);
cdev = get_gadget_data(gadget);
if (!cdev || gi->unbind) {
spin_unlock_irqrestore(&gi->spinlock, flags);
return;
}
composite_resume(gadget);
spin_unlock_irqrestore(&gi->spinlock, flags);
}
static const struct usb_gadget_driver configfs_driver_template = {
.bind = configfs_composite_bind,
.unbind = configfs_composite_unbind,
.setup = configfs_composite_setup,
.reset = configfs_composite_reset,
.disconnect = configfs_composite_disconnect,
.suspend = configfs_composite_suspend,
.resume = configfs_composite_resume,
.max_speed = USB_SPEED_SUPER_PLUS,
.driver = {
.owner = THIS_MODULE,
},
.match_existing_only = 1,
};
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);
config_group_init_type_name(&gi->group, name, &gadget_root_type);
config_group_init_type_name(&gi->functions_group, "functions",
&functions_type);
configfs_add_default_group(&gi->functions_group, &gi->group);
config_group_init_type_name(&gi->configs_group, "configs",
&config_desc_type);
configfs_add_default_group(&gi->configs_group, &gi->group);
config_group_init_type_name(&gi->strings_group, "strings",
&gadget_language_strings_type);
configfs_add_default_group(&gi->strings_group, &gi->group);
config_group_init_type_name(&gi->os_desc_group, "os_desc",
&os_desc_type);
configfs_add_default_group(&gi->os_desc_group, &gi->group);
config_group_init_type_name(&gi->webusb_group, "webusb",
&webusb_type);
configfs_add_default_group(&gi->webusb_group, &gi->group);
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_PLUS;
spin_lock_init(&gi->spinlock);
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.driver.name = kasprintf(GFP_KERNEL,
"configfs-gadget.%s", name);
if (!gi->composite.gadget_driver.driver.name)
goto err;
gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
gi->composite.name = gi->composite.gadget_driver.function;
if (!gi->composite.gadget_driver.function)
goto out_free_driver_name;
return &gi->group;
out_free_driver_name:
kfree(gi->composite.gadget_driver.driver.name);
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 const 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);
mutex_lock(&gi->lock);
unregister_gadget(gi);
mutex_unlock(&gi->lock);
}
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);