| // SPDX-License-Identifier: GPL-2.0 |
| #include <linux/configfs.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/device.h> |
| #include <linux/nls.h> |
| #include <linux/usb/composite.h> |
| #include <linux/usb/gadget_configfs.h> |
| #include "configfs.h" |
| #include "u_f.h" |
| #include "u_os_desc.h" |
| |
| #ifdef CONFIG_USB_CONFIGFS_UEVENT |
| #include <linux/platform_device.h> |
| #include <linux/kdev_t.h> |
| #include <linux/usb/ch9.h> |
| |
| #ifdef CONFIG_USB_CONFIGFS_F_ACC |
| extern int acc_ctrlrequest(struct usb_composite_dev *cdev, |
| const struct usb_ctrlrequest *ctrl); |
| void acc_disconnect(void); |
| #endif |
| static struct class *android_class; |
| static struct device *android_device; |
| static int index; |
| static int gadget_index; |
| |
| struct device *create_function_device(char *name) |
| { |
| if (android_device && !IS_ERR(android_device)) |
| return device_create(android_class, android_device, |
| MKDEV(0, index++), NULL, name); |
| else |
| return ERR_PTR(-EINVAL); |
| } |
| EXPORT_SYMBOL_GPL(create_function_device); |
| #endif |
| |
| 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 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]; |
| spinlock_t spinlock; |
| bool unbind; |
| #ifdef CONFIG_USB_CONFIGFS_UEVENT |
| bool connected; |
| bool sw_connected; |
| struct work_struct work; |
| struct device *dev; |
| #endif |
| }; |
| |
| 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); |
| } |
| |
| struct gadget_strings { |
| struct usb_gadget_strings stringtab_dev; |
| struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX]; |
| char *manufacturer; |
| char *product; |
| char *serialnumber; |
| |
| struct config_group group; |
| struct list_head list; |
| }; |
| |
| struct os_desc { |
| struct config_group group; |
| }; |
| |
| struct gadget_config_name { |
| struct usb_gadget_strings stringtab_dev; |
| struct usb_string strings; |
| char *configuration; |
| |
| struct config_group group; |
| struct list_head list; |
| }; |
| |
| #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 (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) || strcmp(name, "none") == 0) { |
| 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_probe_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_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 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); |
| } |
| |
| 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 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 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 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->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) |
| { |
| return sprintf(page, "%u\n", to_config_usb_cfg(item)->c.MaxPower); |
| } |
| |
| static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item, |
| 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; |
| to_config_usb_cfg(item)->c.MaxPower = val; |
| return len; |
| } |
| |
| static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item, |
| char *page) |
| { |
| return sprintf(page, "0x%02x\n", |
| to_config_usb_cfg(item)->c.bmAttributes); |
| } |
| |
| static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item, |
| 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; |
| to_config_usb_cfg(item)->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; |
| |
| ret = snprintf(buf, MAX_NAME_LEN, "%s", name); |
| if (ret >= MAX_NAME_LEN) |
| return ERR_PTR(-ENAMETOOLONG); |
| |
| func_name = buf; |
| instance_name = strchr(func_name, '.'); |
| if (!instance_name) { |
| pr_err("Unable to locate . in FUNC.INSTANCE\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| *instance_name = '\0'; |
| instance_name++; |
| |
| fi = usb_get_function_instance(func_name); |
| if (IS_ERR(fi)) |
| return ERR_CAST(fi); |
| |
| ret = config_item_set_name(&fi->group.cg_item, "%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); |
| 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); |
| |
| 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_strings, manufacturer); |
| GS_STRINGS_RW(gadget_strings, product); |
| GS_STRINGS_RW(gadget_strings, serialnumber); |
| |
| static struct configfs_attribute *gadget_strings_langid_attrs[] = { |
| &gadget_strings_attr_manufacturer, |
| &gadget_strings_attr_product, |
| &gadget_strings_attr_serialnumber, |
| NULL, |
| }; |
| |
| static void gadget_strings_attr_release(struct config_item *item) |
| { |
| struct gadget_strings *gs = to_gadget_strings(item); |
| |
| kfree(gs->manufacturer); |
| kfree(gs->product); |
| kfree(gs->serialnumber); |
| |
| list_del(&gs->list); |
| kfree(gs); |
| } |
| |
| USB_CONFIG_STRING_RW_OPS(gadget_strings); |
| USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info); |
| |
| static inline struct os_desc *to_os_desc(struct config_item *item) |
| { |
| return container_of(to_config_group(item), struct os_desc, group); |
| } |
| |
| static inline struct gadget_info *os_desc_item_to_gadget_info( |
| struct config_item *item) |
| { |
| return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent); |
| } |
| |
| 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; |
| |
| mutex_lock(&gi->lock); |
| ret = strtobool(page, &use); |
| if (!ret) { |
| gi->use_os_desc = use; |
| ret = len; |
| } |
| mutex_unlock(&gi->lock); |
| |
| return ret; |
| } |
| |
| 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; |
| |
| 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 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 void os_desc_attr_release(struct config_item *item) |
| { |
| struct os_desc *os_desc = to_os_desc(item); |
| kfree(os_desc); |
| } |
| |
| static int os_desc_link(struct config_item *os_desc_ci, |
| struct config_item *usb_cfg_ci) |
| { |
| struct gadget_info *gi = container_of(to_config_group(os_desc_ci), |
| struct gadget_info, os_desc_group); |
| struct usb_composite_dev *cdev = &gi->cdev; |
| struct config_usb_cfg *c_target = |
| container_of(to_config_group(usb_cfg_ci), |
| struct config_usb_cfg, group); |
| struct usb_configuration *c; |
| int ret; |
| |
| mutex_lock(&gi->lock); |
| list_for_each_entry(c, &cdev->configs, list) { |
| if (c == &c_target->c) |
| break; |
| } |
| if (c != &c_target->c) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (cdev->os_desc_config) { |
| ret = -EBUSY; |
| goto out; |
| } |
| |
| cdev->os_desc_config = &c_target->c; |
| ret = 0; |
| |
| out: |
| mutex_unlock(&gi->lock); |
| return ret; |
| } |
| |
| static void 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->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 = { |
| .release = os_desc_attr_release, |
| .allow_link = os_desc_link, |
| .drop_link = os_desc_unlink, |
| }; |
| |
| static struct config_item_type os_desc_type = { |
| .ct_item_ops = &os_desc_ops, |
| .ct_attrs = os_desc_attrs, |
| .ct_owner = THIS_MODULE, |
| }; |
| |
| 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; |
| |
| 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 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 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)) { |
| struct gadget_strings *gs; |
| |
| i = 0; |
| list_for_each_entry(gs, &gi->string_list, list) { |
| |
| gi->gstrings[i] = &gs->stringtab_dev; |
| gs->stringtab_dev.strings = gs->strings; |
| gs->strings[USB_GADGET_MANUFACTURER_IDX].s = |
| gs->manufacturer; |
| gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product; |
| gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber; |
| i++; |
| } |
| gi->gstrings[i] = NULL; |
| s = usb_gstrings_attach(&gi->cdev, gi->gstrings, |
| USB_GADGET_FIRST_AVAIL_IDX); |
| if (IS_ERR(s)) { |
| ret = PTR_ERR(s); |
| goto err_comp_cleanup; |
| } |
| |
| gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id; |
| gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id; |
| gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id; |
| } |
| |
| if (gi->use_os_desc) { |
| cdev->use_os_string = true; |
| cdev->b_vendor_code = gi->b_vendor_code; |
| memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN); |
| } |
| |
| 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; |
| |
| 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; |
| } |
| |
| #ifdef CONFIG_USB_CONFIGFS_UEVENT |
| static void android_work(struct work_struct *data) |
| { |
| struct gadget_info *gi = container_of(data, struct gadget_info, work); |
| struct usb_composite_dev *cdev = &gi->cdev; |
| char *disconnected[2] = { "USB_STATE=DISCONNECTED", NULL }; |
| char *connected[2] = { "USB_STATE=CONNECTED", NULL }; |
| char *configured[2] = { "USB_STATE=CONFIGURED", NULL }; |
| /* 0-connected 1-configured 2-disconnected*/ |
| bool status[3] = { false, false, false }; |
| unsigned long flags; |
| bool uevent_sent = false; |
| |
| spin_lock_irqsave(&cdev->lock, flags); |
| if (cdev->config) |
| status[1] = true; |
| |
| if (gi->connected != gi->sw_connected) { |
| if (gi->connected) |
| status[0] = true; |
| else |
| status[2] = true; |
| gi->sw_connected = gi->connected; |
| } |
| spin_unlock_irqrestore(&cdev->lock, flags); |
| |
| if (status[0]) { |
| kobject_uevent_env(&gi->dev->kobj, KOBJ_CHANGE, connected); |
| pr_info("%s: sent uevent %s\n", __func__, connected[0]); |
| uevent_sent = true; |
| } |
| |
| if (status[1]) { |
| kobject_uevent_env(&gi->dev->kobj, KOBJ_CHANGE, configured); |
| pr_info("%s: sent uevent %s\n", __func__, configured[0]); |
| uevent_sent = true; |
| } |
| |
| if (status[2]) { |
| kobject_uevent_env(&gi->dev->kobj, KOBJ_CHANGE, disconnected); |
| pr_info("%s: sent uevent %s\n", __func__, disconnected[0]); |
| uevent_sent = true; |
| } |
| |
| if (!uevent_sent) { |
| pr_info("%s: did not send uevent (%d %d %p)\n", __func__, |
| gi->connected, gi->sw_connected, cdev->config); |
| } |
| } |
| #endif |
| |
| 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); |
| } |
| |
| #ifdef CONFIG_USB_CONFIGFS_UEVENT |
| static int android_setup(struct usb_gadget *gadget, |
| const struct usb_ctrlrequest *c) |
| { |
| struct usb_composite_dev *cdev = get_gadget_data(gadget); |
| unsigned long flags; |
| struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev); |
| int value = -EOPNOTSUPP; |
| struct usb_function_instance *fi; |
| |
| spin_lock_irqsave(&cdev->lock, flags); |
| if (!gi->connected) { |
| gi->connected = 1; |
| schedule_work(&gi->work); |
| } |
| spin_unlock_irqrestore(&cdev->lock, flags); |
| list_for_each_entry(fi, &gi->available_func, cfs_list) { |
| if (fi != NULL && fi->f != NULL && fi->f->setup != NULL) { |
| value = fi->f->setup(fi->f, c); |
| if (value >= 0) |
| break; |
| } |
| } |
| |
| #ifdef CONFIG_USB_CONFIGFS_F_ACC |
| if (value < 0) |
| value = acc_ctrlrequest(cdev, c); |
| #endif |
| |
| if (value < 0) |
| value = composite_setup(gadget, c); |
| |
| spin_lock_irqsave(&cdev->lock, flags); |
| if (c->bRequest == USB_REQ_SET_CONFIGURATION && |
| cdev->config) { |
| schedule_work(&gi->work); |
| } |
| spin_unlock_irqrestore(&cdev->lock, flags); |
| |
| return value; |
| } |
| |
| #else // CONFIG_USB_CONFIGFS_UEVENT |
| |
| 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; |
| } |
| |
| #endif // CONFIG_USB_CONFIGFS_UEVENT |
| |
| 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; |
| |
| #ifdef CONFIG_USB_CONFIGFS_F_ACC |
| /* |
| * accessory HID support can be active while the |
| * accessory function is not actually enabled, |
| * so we need to inform it when we are disconnected. |
| */ |
| acc_disconnect(); |
| #endif |
| 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; |
| } |
| |
| #ifdef CONFIG_USB_CONFIGFS_UEVENT |
| gi->connected = 0; |
| schedule_work(&gi->work); |
| #endif |
| 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, |
| |
| #ifdef CONFIG_USB_CONFIGFS_UEVENT |
| .setup = android_setup, |
| #else |
| .setup = configfs_composite_setup, |
| #endif |
| .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, |
| .name = "configfs-gadget", |
| }, |
| .match_existing_only = 1, |
| }; |
| |
| #ifdef CONFIG_USB_CONFIGFS_UEVENT |
| static ssize_t state_show(struct device *pdev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct gadget_info *dev = dev_get_drvdata(pdev); |
| struct usb_composite_dev *cdev; |
| char *state = "DISCONNECTED"; |
| unsigned long flags; |
| |
| if (!dev) |
| goto out; |
| |
| cdev = &dev->cdev; |
| |
| if (!cdev) |
| goto out; |
| |
| spin_lock_irqsave(&cdev->lock, flags); |
| if (cdev->config) |
| state = "CONFIGURED"; |
| else if (dev->connected) |
| state = "CONNECTED"; |
| spin_unlock_irqrestore(&cdev->lock, flags); |
| out: |
| return sprintf(buf, "%s\n", state); |
| } |
| |
| static DEVICE_ATTR(state, S_IRUGO, state_show, NULL); |
| |
| static struct device_attribute *android_usb_attributes[] = { |
| &dev_attr_state, |
| NULL |
| }; |
| |
| static int android_device_create(struct gadget_info *gi) |
| { |
| struct device_attribute **attrs; |
| struct device_attribute *attr; |
| |
| INIT_WORK(&gi->work, android_work); |
| gi->dev = device_create(android_class, NULL, |
| MKDEV(0, 0), NULL, "android%d", gadget_index++); |
| if (IS_ERR(gi->dev)) |
| return PTR_ERR(gi->dev); |
| |
| dev_set_drvdata(gi->dev, gi); |
| if (!android_device) |
| android_device = gi->dev; |
| |
| attrs = android_usb_attributes; |
| while ((attr = *attrs++)) { |
| int err; |
| |
| err = device_create_file(gi->dev, attr); |
| if (err) { |
| device_destroy(gi->dev->class, |
| gi->dev->devt); |
| return err; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void android_device_destroy(struct gadget_info *gi) |
| { |
| struct device_attribute **attrs; |
| struct device_attribute *attr; |
| |
| attrs = android_usb_attributes; |
| while ((attr = *attrs++)) |
| device_remove_file(gi->dev, attr); |
| device_destroy(gi->dev->class, gi->dev->devt); |
| } |
| #else |
| static inline int android_device_create(struct gadget_info *gi) |
| { |
| return 0; |
| } |
| |
| static inline void android_device_destroy(struct gadget_info *gi) |
| { |
| } |
| #endif |
| |
| 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_strings_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); |
| |
| 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.function = kstrdup(name, GFP_KERNEL); |
| gi->composite.name = gi->composite.gadget_driver.function; |
| |
| if (!gi->composite.gadget_driver.function) |
| goto err; |
| |
| if (android_device_create(gi) < 0) |
| goto err; |
| |
| return &gi->group; |
| |
| err: |
| kfree(gi); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| static void gadgets_drop(struct config_group *group, struct config_item *item) |
| { |
| struct gadget_info *gi; |
| |
| gi = container_of(to_config_group(item), struct gadget_info, group); |
| config_item_put(item); |
| android_device_destroy(gi); |
| } |
| |
| 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); |
| |
| #ifdef CONFIG_USB_CONFIGFS_UEVENT |
| android_class = class_create(THIS_MODULE, "android_usb"); |
| if (IS_ERR(android_class)) |
| return PTR_ERR(android_class); |
| #endif |
| |
| return ret; |
| } |
| module_init(gadget_cfs_init); |
| |
| static void __exit gadget_cfs_exit(void) |
| { |
| configfs_unregister_subsystem(&gadget_subsys); |
| #ifdef CONFIG_USB_CONFIGFS_UEVENT |
| if (!IS_ERR(android_class)) |
| class_destroy(android_class); |
| #endif |
| |
| } |
| module_exit(gadget_cfs_exit); |