diff options
| -rw-r--r-- | Documentation/ABI/testing/configfs-usb-gadget | 11 | ||||
| -rw-r--r-- | drivers/usb/gadget/configfs.c | 159 |
2 files changed, 169 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/configfs-usb-gadget b/Documentation/ABI/testing/configfs-usb-gadget index 37559a06393b..0e7b786f24ac 100644 --- a/Documentation/ABI/testing/configfs-usb-gadget +++ b/Documentation/ABI/testing/configfs-usb-gadget @@ -79,3 +79,14 @@ Description: product - gadget's product description manufacturer - gadget's manufacturer description +What: /config/usb-gadget/gadget/os_desc +Date: May 2014 +KernelVersion: 3.16 +Description: + This group contains "OS String" extension handling attributes. + + use - flag turning "OS Desctiptors" support on/off + b_vendor_code - one-byte value used for custom per-device and + per-interface requests + qw_sign - an identifier to be reported as "OS String" + proper diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c index b5e965ec8b61..8b9e038ac22b 100644 --- a/drivers/usb/gadget/configfs.c +++ b/drivers/usb/gadget/configfs.c @@ -2,6 +2,7 @@ #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" @@ -43,7 +44,8 @@ struct gadget_info { struct config_group functions_group; struct config_group configs_group; struct config_group strings_group; - struct config_group *default_groups[4]; + struct config_group os_desc_group; + struct config_group *default_groups[5]; struct mutex lock; struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1]; @@ -56,6 +58,9 @@ struct gadget_info { #endif struct usb_composite_driver composite; struct usb_composite_dev cdev; + bool use_os_desc; + char b_vendor_code; + char qw_sign[OS_STRING_QW_SIGN_LEN]; }; struct config_usb_cfg { @@ -79,6 +84,10 @@ struct gadget_strings { 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; @@ -736,6 +745,145 @@ static void gadget_strings_attr_release(struct config_item *item) USB_CONFIG_STRING_RW_OPS(gadget_strings); USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info); +static inline struct os_desc *to_os_desc(struct config_item *item) +{ + return container_of(to_config_group(item), struct os_desc, group); +} + +CONFIGFS_ATTR_STRUCT(os_desc); +CONFIGFS_ATTR_OPS(os_desc); + +static ssize_t os_desc_use_show(struct os_desc *os_desc, char *page) +{ + struct gadget_info *gi; + + gi = to_gadget_info(os_desc->group.cg_item.ci_parent); + + return sprintf(page, "%d", gi->use_os_desc); +} + +static ssize_t os_desc_use_store(struct os_desc *os_desc, const char *page, + size_t len) +{ + struct gadget_info *gi; + int ret; + bool use; + + gi = to_gadget_info(os_desc->group.cg_item.ci_parent); + + mutex_lock(&gi->lock); + ret = strtobool(page, &use); + if (!ret) { + gi->use_os_desc = use; + ret = len; + } + mutex_unlock(&gi->lock); + + return ret; +} + +static struct os_desc_attribute os_desc_use = + __CONFIGFS_ATTR(use, S_IRUGO | S_IWUSR, + os_desc_use_show, + os_desc_use_store); + +static ssize_t os_desc_b_vendor_code_show(struct os_desc *os_desc, char *page) +{ + struct gadget_info *gi; + + gi = to_gadget_info(os_desc->group.cg_item.ci_parent); + + return sprintf(page, "%d", gi->b_vendor_code); +} + +static ssize_t os_desc_b_vendor_code_store(struct os_desc *os_desc, + const char *page, size_t len) +{ + struct gadget_info *gi; + int ret; + u8 b_vendor_code; + + gi = to_gadget_info(os_desc->group.cg_item.ci_parent); + + mutex_lock(&gi->lock); + ret = kstrtou8(page, 0, &b_vendor_code); + if (!ret) { + gi->b_vendor_code = b_vendor_code; + ret = len; + } + mutex_unlock(&gi->lock); + + return ret; +} + +static struct os_desc_attribute os_desc_b_vendor_code = + __CONFIGFS_ATTR(b_vendor_code, S_IRUGO | S_IWUSR, + os_desc_b_vendor_code_show, + os_desc_b_vendor_code_store); + +static ssize_t os_desc_qw_sign_show(struct os_desc *os_desc, char *page) +{ + struct gadget_info *gi; + + gi = to_gadget_info(os_desc->group.cg_item.ci_parent); + + memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN); + + return OS_STRING_QW_SIGN_LEN; +} + +static ssize_t os_desc_qw_sign_store(struct os_desc *os_desc, const char *page, + size_t len) +{ + struct gadget_info *gi; + int res, l; + + gi = to_gadget_info(os_desc->group.cg_item.ci_parent); + l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1); + if (page[l - 1] == '\n') + --l; + + mutex_lock(&gi->lock); + res = utf8s_to_utf16s(page, l, + UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign, + OS_STRING_QW_SIGN_LEN); + if (res > 0) + res = len; + mutex_unlock(&gi->lock); + + return res; +} + +static struct os_desc_attribute os_desc_qw_sign = + __CONFIGFS_ATTR(qw_sign, S_IRUGO | S_IWUSR, + os_desc_qw_sign_show, + os_desc_qw_sign_store); + +static struct configfs_attribute *os_desc_attrs[] = { + &os_desc_use.attr, + &os_desc_b_vendor_code.attr, + &os_desc_qw_sign.attr, + NULL, +}; + +static void os_desc_attr_release(struct config_item *item) +{ + struct os_desc *os_desc = to_os_desc(item); + kfree(os_desc); +} + +static struct configfs_item_operations os_desc_ops = { + .release = os_desc_attr_release, + .show_attribute = os_desc_attr_show, + .store_attribute = os_desc_attr_store, +}; + +static struct config_item_type os_desc_type = { + .ct_item_ops = &os_desc_ops, + .ct_attrs = os_desc_attrs, + .ct_owner = THIS_MODULE, +}; + static int configfs_do_nothing(struct usb_composite_dev *cdev) { WARN_ON(1); @@ -839,6 +987,12 @@ static int configfs_composite_bind(struct usb_gadget *gadget, gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id; } + if (gi->use_os_desc) { + cdev->use_os_string = true; + cdev->b_vendor_code = gi->b_vendor_code; + memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN); + } + /* Go through all configs, attach all functions */ list_for_each_entry(c, &gi->cdev.configs, list) { struct config_usb_cfg *cfg; @@ -929,6 +1083,7 @@ static struct config_group *gadgets_make( gi->group.default_groups[0] = &gi->functions_group; gi->group.default_groups[1] = &gi->configs_group; gi->group.default_groups[2] = &gi->strings_group; + gi->group.default_groups[3] = &gi->os_desc_group; config_group_init_type_name(&gi->functions_group, "functions", &functions_type); @@ -936,6 +1091,8 @@ static struct config_group *gadgets_make( &config_desc_type); config_group_init_type_name(&gi->strings_group, "strings", &gadget_strings_strings_type); + config_group_init_type_name(&gi->os_desc_group, "os_desc", + &os_desc_type); gi->composite.bind = configfs_do_nothing; gi->composite.unbind = configfs_do_nothing; |