mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
da4243145f
Add handling of OS Extended Compatibility descriptors from configfs interface. Hosts which expect the "OS Descriptors" ask only for configurations @ index 0, but linux-based USB devices can provide more than one configuration. This patch adds marking one of gadget's configurations the configuration to be reported at index 0, regardless of the actual sequence of usb_add_config invocations used for adding the configurations. The configuration is selected by creating a symbolic link pointing to it from the "os_desc" directory located at the top of a gadget's directory hierarchy. One kind of "OS Descriptors" are "Extended Compatibility Descriptors", which need to be specified per interface. This patch adds interface.<n> directory in function's configfs directory to represent each interface defined by the function. Each interface's directory contains two attributes: "compatible_id" and "sub_compatible_id", which represent 8-byte strings to be reported to the host as the "Compatible ID" and "Sub Compatible ID". Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
1373 lines
33 KiB
C
1373 lines
33 KiB
C
#include <linux/configfs.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/nls.h>
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#include <linux/usb/composite.h>
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#include <linux/usb/gadget_configfs.h>
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#include "configfs.h"
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#include "u_f.h"
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int check_user_usb_string(const char *name,
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struct usb_gadget_strings *stringtab_dev)
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{
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unsigned primary_lang;
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unsigned sub_lang;
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u16 num;
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int ret;
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ret = kstrtou16(name, 0, &num);
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if (ret)
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return ret;
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primary_lang = num & 0x3ff;
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sub_lang = num >> 10;
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/* simple sanity check for valid langid */
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switch (primary_lang) {
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case 0:
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case 0x62 ... 0xfe:
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case 0x100 ... 0x3ff:
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return -EINVAL;
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}
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if (!sub_lang)
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return -EINVAL;
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stringtab_dev->language = num;
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return 0;
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}
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#define MAX_NAME_LEN 40
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#define MAX_USB_STRING_LANGS 2
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struct gadget_info {
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struct config_group group;
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struct config_group functions_group;
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struct config_group configs_group;
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struct config_group strings_group;
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struct config_group os_desc_group;
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struct config_group *default_groups[5];
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struct mutex lock;
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struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
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struct list_head string_list;
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struct list_head available_func;
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const char *udc_name;
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#ifdef CONFIG_USB_OTG
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struct usb_otg_descriptor otg;
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#endif
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struct usb_composite_driver composite;
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struct usb_composite_dev cdev;
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bool use_os_desc;
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char b_vendor_code;
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char qw_sign[OS_STRING_QW_SIGN_LEN];
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};
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struct config_usb_cfg {
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struct config_group group;
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struct config_group strings_group;
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struct config_group *default_groups[2];
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struct list_head string_list;
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struct usb_configuration c;
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struct list_head func_list;
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struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
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};
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struct gadget_strings {
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struct usb_gadget_strings stringtab_dev;
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struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
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char *manufacturer;
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char *product;
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char *serialnumber;
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struct config_group group;
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struct list_head list;
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};
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struct os_desc {
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struct config_group group;
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};
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struct gadget_config_name {
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struct usb_gadget_strings stringtab_dev;
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struct usb_string strings;
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char *configuration;
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struct config_group group;
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struct list_head list;
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};
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static int usb_string_copy(const char *s, char **s_copy)
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{
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int ret;
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char *str;
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char *copy = *s_copy;
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ret = strlen(s);
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if (ret > 126)
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return -EOVERFLOW;
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str = kstrdup(s, GFP_KERNEL);
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if (!str)
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return -ENOMEM;
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if (str[ret - 1] == '\n')
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str[ret - 1] = '\0';
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kfree(copy);
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*s_copy = str;
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return 0;
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}
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CONFIGFS_ATTR_STRUCT(gadget_info);
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CONFIGFS_ATTR_STRUCT(config_usb_cfg);
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#define GI_DEVICE_DESC_ITEM_ATTR(name) \
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static struct gadget_info_attribute gadget_cdev_desc_##name = \
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__CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
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gadget_dev_desc_##name##_show, \
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gadget_dev_desc_##name##_store)
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#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
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static ssize_t gadget_dev_desc_##__name##_show(struct gadget_info *gi, \
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char *page) \
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{ \
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return sprintf(page, "0x%02x\n", gi->cdev.desc.__name); \
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}
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#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
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static ssize_t gadget_dev_desc_##__name##_show(struct gadget_info *gi, \
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char *page) \
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{ \
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return sprintf(page, "0x%04x\n", le16_to_cpup(&gi->cdev.desc.__name)); \
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}
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#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
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static ssize_t gadget_dev_desc_##_name##_store(struct gadget_info *gi, \
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const char *page, size_t len) \
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{ \
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u8 val; \
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int ret; \
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ret = kstrtou8(page, 0, &val); \
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if (ret) \
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return ret; \
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gi->cdev.desc._name = val; \
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return len; \
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}
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#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
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static ssize_t gadget_dev_desc_##_name##_store(struct gadget_info *gi, \
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const char *page, size_t len) \
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{ \
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u16 val; \
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int ret; \
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ret = kstrtou16(page, 0, &val); \
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if (ret) \
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return ret; \
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gi->cdev.desc._name = cpu_to_le16p(&val); \
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return len; \
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}
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#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
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GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
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GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
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GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
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GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
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GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
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GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
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GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
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GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
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GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
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GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
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static ssize_t is_valid_bcd(u16 bcd_val)
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{
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if ((bcd_val & 0xf) > 9)
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return -EINVAL;
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if (((bcd_val >> 4) & 0xf) > 9)
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return -EINVAL;
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if (((bcd_val >> 8) & 0xf) > 9)
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return -EINVAL;
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if (((bcd_val >> 12) & 0xf) > 9)
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return -EINVAL;
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return 0;
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}
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static ssize_t gadget_dev_desc_bcdDevice_store(struct gadget_info *gi,
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const char *page, size_t len)
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{
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u16 bcdDevice;
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int ret;
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ret = kstrtou16(page, 0, &bcdDevice);
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if (ret)
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return ret;
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ret = is_valid_bcd(bcdDevice);
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if (ret)
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return ret;
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gi->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
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return len;
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}
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static ssize_t gadget_dev_desc_bcdUSB_store(struct gadget_info *gi,
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const char *page, size_t len)
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{
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u16 bcdUSB;
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int ret;
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ret = kstrtou16(page, 0, &bcdUSB);
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if (ret)
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return ret;
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ret = is_valid_bcd(bcdUSB);
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if (ret)
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return ret;
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gi->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
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return len;
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}
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static ssize_t gadget_dev_desc_UDC_show(struct gadget_info *gi, char *page)
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{
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return sprintf(page, "%s\n", gi->udc_name ?: "");
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}
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static int unregister_gadget(struct gadget_info *gi)
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{
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int ret;
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if (!gi->udc_name)
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return -ENODEV;
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ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
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if (ret)
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return ret;
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kfree(gi->udc_name);
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gi->udc_name = NULL;
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return 0;
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}
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static ssize_t gadget_dev_desc_UDC_store(struct gadget_info *gi,
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const char *page, size_t len)
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{
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char *name;
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int ret;
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name = kstrdup(page, GFP_KERNEL);
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if (!name)
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return -ENOMEM;
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if (name[len - 1] == '\n')
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name[len - 1] = '\0';
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mutex_lock(&gi->lock);
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if (!strlen(name)) {
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ret = unregister_gadget(gi);
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if (ret)
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goto err;
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} else {
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if (gi->udc_name) {
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ret = -EBUSY;
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goto err;
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}
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ret = udc_attach_driver(name, &gi->composite.gadget_driver);
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if (ret)
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goto err;
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gi->udc_name = name;
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}
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mutex_unlock(&gi->lock);
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return len;
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err:
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kfree(name);
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mutex_unlock(&gi->lock);
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return ret;
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}
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GI_DEVICE_DESC_ITEM_ATTR(bDeviceClass);
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GI_DEVICE_DESC_ITEM_ATTR(bDeviceSubClass);
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GI_DEVICE_DESC_ITEM_ATTR(bDeviceProtocol);
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GI_DEVICE_DESC_ITEM_ATTR(bMaxPacketSize0);
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GI_DEVICE_DESC_ITEM_ATTR(idVendor);
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GI_DEVICE_DESC_ITEM_ATTR(idProduct);
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GI_DEVICE_DESC_ITEM_ATTR(bcdDevice);
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GI_DEVICE_DESC_ITEM_ATTR(bcdUSB);
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GI_DEVICE_DESC_ITEM_ATTR(UDC);
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static struct configfs_attribute *gadget_root_attrs[] = {
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&gadget_cdev_desc_bDeviceClass.attr,
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&gadget_cdev_desc_bDeviceSubClass.attr,
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&gadget_cdev_desc_bDeviceProtocol.attr,
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&gadget_cdev_desc_bMaxPacketSize0.attr,
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&gadget_cdev_desc_idVendor.attr,
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&gadget_cdev_desc_idProduct.attr,
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&gadget_cdev_desc_bcdDevice.attr,
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&gadget_cdev_desc_bcdUSB.attr,
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&gadget_cdev_desc_UDC.attr,
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NULL,
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};
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static inline struct gadget_info *to_gadget_info(struct config_item *item)
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{
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return container_of(to_config_group(item), struct gadget_info, group);
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}
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static inline struct gadget_strings *to_gadget_strings(struct config_item *item)
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{
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return container_of(to_config_group(item), struct gadget_strings,
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group);
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}
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static inline struct gadget_config_name *to_gadget_config_name(
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struct config_item *item)
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{
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return container_of(to_config_group(item), struct gadget_config_name,
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group);
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}
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static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
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{
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return container_of(to_config_group(item), struct config_usb_cfg,
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group);
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}
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static inline struct usb_function_instance *to_usb_function_instance(
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struct config_item *item)
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{
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return container_of(to_config_group(item),
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struct usb_function_instance, group);
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}
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static void gadget_info_attr_release(struct config_item *item)
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{
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struct gadget_info *gi = to_gadget_info(item);
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WARN_ON(!list_empty(&gi->cdev.configs));
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WARN_ON(!list_empty(&gi->string_list));
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WARN_ON(!list_empty(&gi->available_func));
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kfree(gi->composite.gadget_driver.function);
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kfree(gi);
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}
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CONFIGFS_ATTR_OPS(gadget_info);
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static struct configfs_item_operations gadget_root_item_ops = {
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.release = gadget_info_attr_release,
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.show_attribute = gadget_info_attr_show,
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.store_attribute = gadget_info_attr_store,
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};
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static void gadget_config_attr_release(struct config_item *item)
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{
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struct config_usb_cfg *cfg = to_config_usb_cfg(item);
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WARN_ON(!list_empty(&cfg->c.functions));
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list_del(&cfg->c.list);
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kfree(cfg->c.label);
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kfree(cfg);
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}
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static int config_usb_cfg_link(
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struct config_item *usb_cfg_ci,
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struct config_item *usb_func_ci)
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{
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struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
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struct usb_composite_dev *cdev = cfg->c.cdev;
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struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
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struct config_group *group = to_config_group(usb_func_ci);
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struct usb_function_instance *fi = container_of(group,
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struct usb_function_instance, group);
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struct usb_function_instance *a_fi;
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struct usb_function *f;
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int ret;
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mutex_lock(&gi->lock);
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/*
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* Make sure this function is from within our _this_ gadget and not
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* from another gadget or a random directory.
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* Also a function instance can only be linked once.
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*/
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list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
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if (a_fi == fi)
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break;
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}
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if (a_fi != fi) {
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ret = -EINVAL;
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goto out;
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}
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list_for_each_entry(f, &cfg->func_list, list) {
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if (f->fi == fi) {
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ret = -EEXIST;
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goto out;
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}
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}
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f = usb_get_function(fi);
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if (IS_ERR(f)) {
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ret = PTR_ERR(f);
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goto out;
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}
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/* stash the function until we bind it to the gadget */
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list_add_tail(&f->list, &cfg->func_list);
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ret = 0;
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out:
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mutex_unlock(&gi->lock);
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return ret;
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}
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static int config_usb_cfg_unlink(
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struct config_item *usb_cfg_ci,
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struct config_item *usb_func_ci)
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{
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struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
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struct usb_composite_dev *cdev = cfg->c.cdev;
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struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
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struct config_group *group = to_config_group(usb_func_ci);
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struct usb_function_instance *fi = container_of(group,
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struct usb_function_instance, group);
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struct usb_function *f;
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/*
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* ideally I would like to forbid to unlink functions while a gadget is
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* bound to an UDC. Since this isn't possible at the moment, we simply
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* force an unbind, the function is available here and then we can
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* remove the function.
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*/
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mutex_lock(&gi->lock);
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if (gi->udc_name)
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unregister_gadget(gi);
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WARN_ON(gi->udc_name);
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list_for_each_entry(f, &cfg->func_list, list) {
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if (f->fi == fi) {
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list_del(&f->list);
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usb_put_function(f);
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mutex_unlock(&gi->lock);
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return 0;
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}
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}
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mutex_unlock(&gi->lock);
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WARN(1, "Unable to locate function to unbind\n");
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return 0;
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}
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CONFIGFS_ATTR_OPS(config_usb_cfg);
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static struct configfs_item_operations gadget_config_item_ops = {
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.release = gadget_config_attr_release,
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.show_attribute = config_usb_cfg_attr_show,
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.store_attribute = config_usb_cfg_attr_store,
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.allow_link = config_usb_cfg_link,
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.drop_link = config_usb_cfg_unlink,
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};
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|
|
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static ssize_t gadget_config_desc_MaxPower_show(struct config_usb_cfg *cfg,
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char *page)
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{
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return sprintf(page, "%u\n", cfg->c.MaxPower);
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}
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static ssize_t gadget_config_desc_MaxPower_store(struct config_usb_cfg *cfg,
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const char *page, size_t len)
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{
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u16 val;
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int ret;
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ret = kstrtou16(page, 0, &val);
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if (ret)
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return ret;
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if (DIV_ROUND_UP(val, 8) > 0xff)
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return -ERANGE;
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cfg->c.MaxPower = val;
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return len;
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}
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static ssize_t gadget_config_desc_bmAttributes_show(struct config_usb_cfg *cfg,
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char *page)
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{
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return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
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}
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static ssize_t gadget_config_desc_bmAttributes_store(struct config_usb_cfg *cfg,
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const char *page, size_t len)
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{
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u8 val;
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int ret;
|
|
ret = kstrtou8(page, 0, &val);
|
|
if (ret)
|
|
return ret;
|
|
if (!(val & USB_CONFIG_ATT_ONE))
|
|
return -EINVAL;
|
|
if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
|
|
USB_CONFIG_ATT_WAKEUP))
|
|
return -EINVAL;
|
|
cfg->c.bmAttributes = val;
|
|
return len;
|
|
}
|
|
|
|
#define CFG_CONFIG_DESC_ITEM_ATTR(name) \
|
|
static struct config_usb_cfg_attribute gadget_usb_cfg_##name = \
|
|
__CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
|
|
gadget_config_desc_##name##_show, \
|
|
gadget_config_desc_##name##_store)
|
|
|
|
CFG_CONFIG_DESC_ITEM_ATTR(MaxPower);
|
|
CFG_CONFIG_DESC_ITEM_ATTR(bmAttributes);
|
|
|
|
static struct configfs_attribute *gadget_config_attrs[] = {
|
|
&gadget_usb_cfg_MaxPower.attr,
|
|
&gadget_usb_cfg_bmAttributes.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct config_item_type gadget_config_type = {
|
|
.ct_item_ops = &gadget_config_item_ops,
|
|
.ct_attrs = gadget_config_attrs,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
static struct config_item_type gadget_root_type = {
|
|
.ct_item_ops = &gadget_root_item_ops,
|
|
.ct_attrs = gadget_root_attrs,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
static void composite_init_dev(struct usb_composite_dev *cdev)
|
|
{
|
|
spin_lock_init(&cdev->lock);
|
|
INIT_LIST_HEAD(&cdev->configs);
|
|
INIT_LIST_HEAD(&cdev->gstrings);
|
|
}
|
|
|
|
static struct config_group *function_make(
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct gadget_info *gi;
|
|
struct usb_function_instance *fi;
|
|
char buf[MAX_NAME_LEN];
|
|
char *func_name;
|
|
char *instance_name;
|
|
int ret;
|
|
|
|
ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
|
|
if (ret >= MAX_NAME_LEN)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
func_name = buf;
|
|
instance_name = strchr(func_name, '.');
|
|
if (!instance_name) {
|
|
pr_err("Unable to locate . in FUNC.INSTANCE\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
*instance_name = '\0';
|
|
instance_name++;
|
|
|
|
fi = usb_get_function_instance(func_name);
|
|
if (IS_ERR(fi))
|
|
return ERR_CAST(fi);
|
|
|
|
ret = config_item_set_name(&fi->group.cg_item, name);
|
|
if (ret) {
|
|
usb_put_function_instance(fi);
|
|
return ERR_PTR(ret);
|
|
}
|
|
if (fi->set_inst_name) {
|
|
ret = fi->set_inst_name(fi, instance_name);
|
|
if (ret) {
|
|
usb_put_function_instance(fi);
|
|
return ERR_PTR(ret);
|
|
}
|
|
}
|
|
|
|
gi = container_of(group, struct gadget_info, functions_group);
|
|
|
|
mutex_lock(&gi->lock);
|
|
list_add_tail(&fi->cfs_list, &gi->available_func);
|
|
mutex_unlock(&gi->lock);
|
|
return &fi->group;
|
|
}
|
|
|
|
static void function_drop(
|
|
struct config_group *group,
|
|
struct config_item *item)
|
|
{
|
|
struct usb_function_instance *fi = to_usb_function_instance(item);
|
|
struct gadget_info *gi;
|
|
|
|
gi = container_of(group, struct gadget_info, functions_group);
|
|
|
|
mutex_lock(&gi->lock);
|
|
list_del(&fi->cfs_list);
|
|
mutex_unlock(&gi->lock);
|
|
config_item_put(item);
|
|
}
|
|
|
|
static struct configfs_group_operations functions_ops = {
|
|
.make_group = &function_make,
|
|
.drop_item = &function_drop,
|
|
};
|
|
|
|
static struct config_item_type functions_type = {
|
|
.ct_group_ops = &functions_ops,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
CONFIGFS_ATTR_STRUCT(gadget_config_name);
|
|
GS_STRINGS_RW(gadget_config_name, configuration);
|
|
|
|
static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
|
|
&gadget_config_name_configuration.attr,
|
|
NULL,
|
|
};
|
|
|
|
static void gadget_config_name_attr_release(struct config_item *item)
|
|
{
|
|
struct gadget_config_name *cn = to_gadget_config_name(item);
|
|
|
|
kfree(cn->configuration);
|
|
|
|
list_del(&cn->list);
|
|
kfree(cn);
|
|
}
|
|
|
|
USB_CONFIG_STRING_RW_OPS(gadget_config_name);
|
|
USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
|
|
|
|
static struct config_group *config_desc_make(
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct gadget_info *gi;
|
|
struct config_usb_cfg *cfg;
|
|
char buf[MAX_NAME_LEN];
|
|
char *num_str;
|
|
u8 num;
|
|
int ret;
|
|
|
|
gi = container_of(group, struct gadget_info, configs_group);
|
|
ret = snprintf(buf, MAX_NAME_LEN, "%s", name);
|
|
if (ret >= MAX_NAME_LEN)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
num_str = strchr(buf, '.');
|
|
if (!num_str) {
|
|
pr_err("Unable to locate . in name.bConfigurationValue\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
*num_str = '\0';
|
|
num_str++;
|
|
|
|
if (!strlen(buf))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
ret = kstrtou8(num_str, 0, &num);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
|
|
if (!cfg)
|
|
return ERR_PTR(-ENOMEM);
|
|
cfg->c.label = kstrdup(buf, GFP_KERNEL);
|
|
if (!cfg->c.label) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
cfg->c.bConfigurationValue = num;
|
|
cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
|
|
cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
|
|
INIT_LIST_HEAD(&cfg->string_list);
|
|
INIT_LIST_HEAD(&cfg->func_list);
|
|
|
|
cfg->group.default_groups = cfg->default_groups;
|
|
cfg->default_groups[0] = &cfg->strings_group;
|
|
|
|
config_group_init_type_name(&cfg->group, name,
|
|
&gadget_config_type);
|
|
config_group_init_type_name(&cfg->strings_group, "strings",
|
|
&gadget_config_name_strings_type);
|
|
|
|
ret = usb_add_config_only(&gi->cdev, &cfg->c);
|
|
if (ret)
|
|
goto err;
|
|
|
|
return &cfg->group;
|
|
err:
|
|
kfree(cfg->c.label);
|
|
kfree(cfg);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static void config_desc_drop(
|
|
struct config_group *group,
|
|
struct config_item *item)
|
|
{
|
|
config_item_put(item);
|
|
}
|
|
|
|
static struct configfs_group_operations config_desc_ops = {
|
|
.make_group = &config_desc_make,
|
|
.drop_item = &config_desc_drop,
|
|
};
|
|
|
|
static struct config_item_type config_desc_type = {
|
|
.ct_group_ops = &config_desc_ops,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
CONFIGFS_ATTR_STRUCT(gadget_strings);
|
|
GS_STRINGS_RW(gadget_strings, manufacturer);
|
|
GS_STRINGS_RW(gadget_strings, product);
|
|
GS_STRINGS_RW(gadget_strings, serialnumber);
|
|
|
|
static struct configfs_attribute *gadget_strings_langid_attrs[] = {
|
|
&gadget_strings_manufacturer.attr,
|
|
&gadget_strings_product.attr,
|
|
&gadget_strings_serialnumber.attr,
|
|
NULL,
|
|
};
|
|
|
|
static void gadget_strings_attr_release(struct config_item *item)
|
|
{
|
|
struct gadget_strings *gs = to_gadget_strings(item);
|
|
|
|
kfree(gs->manufacturer);
|
|
kfree(gs->product);
|
|
kfree(gs->serialnumber);
|
|
|
|
list_del(&gs->list);
|
|
kfree(gs);
|
|
}
|
|
|
|
USB_CONFIG_STRING_RW_OPS(gadget_strings);
|
|
USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
|
|
|
|
static inline struct os_desc *to_os_desc(struct config_item *item)
|
|
{
|
|
return container_of(to_config_group(item), struct os_desc, group);
|
|
}
|
|
|
|
CONFIGFS_ATTR_STRUCT(os_desc);
|
|
CONFIGFS_ATTR_OPS(os_desc);
|
|
|
|
static ssize_t os_desc_use_show(struct os_desc *os_desc, char *page)
|
|
{
|
|
struct gadget_info *gi;
|
|
|
|
gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
|
|
|
|
return sprintf(page, "%d", gi->use_os_desc);
|
|
}
|
|
|
|
static ssize_t os_desc_use_store(struct os_desc *os_desc, const char *page,
|
|
size_t len)
|
|
{
|
|
struct gadget_info *gi;
|
|
int ret;
|
|
bool use;
|
|
|
|
gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
|
|
|
|
mutex_lock(&gi->lock);
|
|
ret = strtobool(page, &use);
|
|
if (!ret) {
|
|
gi->use_os_desc = use;
|
|
ret = len;
|
|
}
|
|
mutex_unlock(&gi->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct os_desc_attribute os_desc_use =
|
|
__CONFIGFS_ATTR(use, S_IRUGO | S_IWUSR,
|
|
os_desc_use_show,
|
|
os_desc_use_store);
|
|
|
|
static ssize_t os_desc_b_vendor_code_show(struct os_desc *os_desc, char *page)
|
|
{
|
|
struct gadget_info *gi;
|
|
|
|
gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
|
|
|
|
return sprintf(page, "%d", gi->b_vendor_code);
|
|
}
|
|
|
|
static ssize_t os_desc_b_vendor_code_store(struct os_desc *os_desc,
|
|
const char *page, size_t len)
|
|
{
|
|
struct gadget_info *gi;
|
|
int ret;
|
|
u8 b_vendor_code;
|
|
|
|
gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
|
|
|
|
mutex_lock(&gi->lock);
|
|
ret = kstrtou8(page, 0, &b_vendor_code);
|
|
if (!ret) {
|
|
gi->b_vendor_code = b_vendor_code;
|
|
ret = len;
|
|
}
|
|
mutex_unlock(&gi->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct os_desc_attribute os_desc_b_vendor_code =
|
|
__CONFIGFS_ATTR(b_vendor_code, S_IRUGO | S_IWUSR,
|
|
os_desc_b_vendor_code_show,
|
|
os_desc_b_vendor_code_store);
|
|
|
|
static ssize_t os_desc_qw_sign_show(struct os_desc *os_desc, char *page)
|
|
{
|
|
struct gadget_info *gi;
|
|
|
|
gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
|
|
|
|
memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
|
|
|
|
return OS_STRING_QW_SIGN_LEN;
|
|
}
|
|
|
|
static ssize_t os_desc_qw_sign_store(struct os_desc *os_desc, const char *page,
|
|
size_t len)
|
|
{
|
|
struct gadget_info *gi;
|
|
int res, l;
|
|
|
|
gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
|
|
l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
|
|
if (page[l - 1] == '\n')
|
|
--l;
|
|
|
|
mutex_lock(&gi->lock);
|
|
res = utf8s_to_utf16s(page, l,
|
|
UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
|
|
OS_STRING_QW_SIGN_LEN);
|
|
if (res > 0)
|
|
res = len;
|
|
mutex_unlock(&gi->lock);
|
|
|
|
return res;
|
|
}
|
|
|
|
static struct os_desc_attribute os_desc_qw_sign =
|
|
__CONFIGFS_ATTR(qw_sign, S_IRUGO | S_IWUSR,
|
|
os_desc_qw_sign_show,
|
|
os_desc_qw_sign_store);
|
|
|
|
static struct configfs_attribute *os_desc_attrs[] = {
|
|
&os_desc_use.attr,
|
|
&os_desc_b_vendor_code.attr,
|
|
&os_desc_qw_sign.attr,
|
|
NULL,
|
|
};
|
|
|
|
static void os_desc_attr_release(struct config_item *item)
|
|
{
|
|
struct os_desc *os_desc = to_os_desc(item);
|
|
kfree(os_desc);
|
|
}
|
|
|
|
static int os_desc_link(struct config_item *os_desc_ci,
|
|
struct config_item *usb_cfg_ci)
|
|
{
|
|
struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
|
|
struct gadget_info, os_desc_group);
|
|
struct usb_composite_dev *cdev = &gi->cdev;
|
|
struct config_usb_cfg *c_target =
|
|
container_of(to_config_group(usb_cfg_ci),
|
|
struct config_usb_cfg, group);
|
|
struct usb_configuration *c;
|
|
int ret;
|
|
|
|
mutex_lock(&gi->lock);
|
|
list_for_each_entry(c, &cdev->configs, list) {
|
|
if (c == &c_target->c)
|
|
break;
|
|
}
|
|
if (c != &c_target->c) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (cdev->os_desc_config) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
cdev->os_desc_config = &c_target->c;
|
|
ret = 0;
|
|
|
|
out:
|
|
mutex_unlock(&gi->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int os_desc_unlink(struct config_item *os_desc_ci,
|
|
struct config_item *usb_cfg_ci)
|
|
{
|
|
struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
|
|
struct gadget_info, os_desc_group);
|
|
struct usb_composite_dev *cdev = &gi->cdev;
|
|
|
|
mutex_lock(&gi->lock);
|
|
if (gi->udc_name)
|
|
unregister_gadget(gi);
|
|
cdev->os_desc_config = NULL;
|
|
WARN_ON(gi->udc_name);
|
|
mutex_unlock(&gi->lock);
|
|
return 0;
|
|
}
|
|
|
|
static struct configfs_item_operations os_desc_ops = {
|
|
.release = os_desc_attr_release,
|
|
.show_attribute = os_desc_attr_show,
|
|
.store_attribute = os_desc_attr_store,
|
|
.allow_link = os_desc_link,
|
|
.drop_link = os_desc_unlink,
|
|
};
|
|
|
|
static struct config_item_type os_desc_type = {
|
|
.ct_item_ops = &os_desc_ops,
|
|
.ct_attrs = os_desc_attrs,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
CONFIGFS_ATTR_STRUCT(usb_os_desc);
|
|
CONFIGFS_ATTR_OPS(usb_os_desc);
|
|
|
|
static struct configfs_item_operations interf_item_ops = {
|
|
.show_attribute = usb_os_desc_attr_show,
|
|
.store_attribute = usb_os_desc_attr_store,
|
|
};
|
|
|
|
static ssize_t rndis_grp_compatible_id_show(struct usb_os_desc *desc,
|
|
char *page)
|
|
{
|
|
memcpy(page, desc->ext_compat_id, 8);
|
|
return 8;
|
|
}
|
|
|
|
static ssize_t rndis_grp_compatible_id_store(struct usb_os_desc *desc,
|
|
const char *page, size_t len)
|
|
{
|
|
int l;
|
|
|
|
l = min_t(int, 8, len);
|
|
if (page[l - 1] == '\n')
|
|
--l;
|
|
if (desc->opts_mutex)
|
|
mutex_lock(desc->opts_mutex);
|
|
memcpy(desc->ext_compat_id, page, l);
|
|
desc->ext_compat_id[l] = '\0';
|
|
|
|
if (desc->opts_mutex)
|
|
mutex_unlock(desc->opts_mutex);
|
|
|
|
return len;
|
|
}
|
|
|
|
static struct usb_os_desc_attribute rndis_grp_attr_compatible_id =
|
|
__CONFIGFS_ATTR(compatible_id, S_IRUGO | S_IWUSR,
|
|
rndis_grp_compatible_id_show,
|
|
rndis_grp_compatible_id_store);
|
|
|
|
static ssize_t rndis_grp_sub_compatible_id_show(struct usb_os_desc *desc,
|
|
char *page)
|
|
{
|
|
memcpy(page, desc->ext_compat_id + 8, 8);
|
|
return 8;
|
|
}
|
|
|
|
static ssize_t rndis_grp_sub_compatible_id_store(struct usb_os_desc *desc,
|
|
const char *page, size_t len)
|
|
{
|
|
int l;
|
|
|
|
l = min_t(int, 8, len);
|
|
if (page[l - 1] == '\n')
|
|
--l;
|
|
if (desc->opts_mutex)
|
|
mutex_lock(desc->opts_mutex);
|
|
memcpy(desc->ext_compat_id + 8, page, l);
|
|
desc->ext_compat_id[l + 8] = '\0';
|
|
|
|
if (desc->opts_mutex)
|
|
mutex_unlock(desc->opts_mutex);
|
|
|
|
return len;
|
|
}
|
|
|
|
static struct usb_os_desc_attribute rndis_grp_attr_sub_compatible_id =
|
|
__CONFIGFS_ATTR(sub_compatible_id, S_IRUGO | S_IWUSR,
|
|
rndis_grp_sub_compatible_id_show,
|
|
rndis_grp_sub_compatible_id_store);
|
|
|
|
static struct configfs_attribute *interf_grp_attrs[] = {
|
|
&rndis_grp_attr_compatible_id.attr,
|
|
&rndis_grp_attr_sub_compatible_id.attr,
|
|
NULL
|
|
};
|
|
|
|
int usb_os_desc_prepare_interf_dir(struct config_group *parent,
|
|
int n_interf,
|
|
struct usb_os_desc **desc,
|
|
struct module *owner)
|
|
{
|
|
struct config_group **f_default_groups, *os_desc_group,
|
|
**interface_groups;
|
|
struct config_item_type *os_desc_type, *interface_type;
|
|
|
|
vla_group(data_chunk);
|
|
vla_item(data_chunk, struct config_group *, f_default_groups, 2);
|
|
vla_item(data_chunk, struct config_group, os_desc_group, 1);
|
|
vla_item(data_chunk, struct config_group *, interface_groups,
|
|
n_interf + 1);
|
|
vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
|
|
vla_item(data_chunk, struct config_item_type, interface_type, 1);
|
|
|
|
char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
|
|
if (!vlabuf)
|
|
return -ENOMEM;
|
|
|
|
f_default_groups = vla_ptr(vlabuf, data_chunk, f_default_groups);
|
|
os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
|
|
os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
|
|
interface_groups = vla_ptr(vlabuf, data_chunk, interface_groups);
|
|
interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
|
|
|
|
parent->default_groups = f_default_groups;
|
|
os_desc_type->ct_owner = owner;
|
|
config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
|
|
f_default_groups[0] = os_desc_group;
|
|
|
|
os_desc_group->default_groups = interface_groups;
|
|
interface_type->ct_item_ops = &interf_item_ops;
|
|
interface_type->ct_attrs = interf_grp_attrs;
|
|
interface_type->ct_owner = owner;
|
|
|
|
while (n_interf--) {
|
|
struct usb_os_desc *d;
|
|
|
|
d = desc[n_interf];
|
|
config_group_init_type_name(&d->group, "", interface_type);
|
|
config_item_set_name(&d->group.cg_item, "interface.%d",
|
|
n_interf);
|
|
interface_groups[n_interf] = &d->group;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
|
|
|
|
static int configfs_do_nothing(struct usb_composite_dev *cdev)
|
|
{
|
|
WARN_ON(1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
int composite_dev_prepare(struct usb_composite_driver *composite,
|
|
struct usb_composite_dev *dev);
|
|
|
|
int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
|
|
struct usb_ep *ep0);
|
|
|
|
static void purge_configs_funcs(struct gadget_info *gi)
|
|
{
|
|
struct usb_configuration *c;
|
|
|
|
list_for_each_entry(c, &gi->cdev.configs, list) {
|
|
struct usb_function *f, *tmp;
|
|
struct config_usb_cfg *cfg;
|
|
|
|
cfg = container_of(c, struct config_usb_cfg, c);
|
|
|
|
list_for_each_entry_safe(f, tmp, &c->functions, list) {
|
|
|
|
list_move_tail(&f->list, &cfg->func_list);
|
|
if (f->unbind) {
|
|
dev_err(&gi->cdev.gadget->dev, "unbind function"
|
|
" '%s'/%p\n", f->name, f);
|
|
f->unbind(c, f);
|
|
}
|
|
}
|
|
c->next_interface_id = 0;
|
|
c->superspeed = 0;
|
|
c->highspeed = 0;
|
|
c->fullspeed = 0;
|
|
}
|
|
}
|
|
|
|
static int configfs_composite_bind(struct usb_gadget *gadget,
|
|
struct usb_gadget_driver *gdriver)
|
|
{
|
|
struct usb_composite_driver *composite = to_cdriver(gdriver);
|
|
struct gadget_info *gi = container_of(composite,
|
|
struct gadget_info, composite);
|
|
struct usb_composite_dev *cdev = &gi->cdev;
|
|
struct usb_configuration *c;
|
|
struct usb_string *s;
|
|
unsigned i;
|
|
int ret;
|
|
|
|
/* the gi->lock is hold by the caller */
|
|
cdev->gadget = gadget;
|
|
set_gadget_data(gadget, cdev);
|
|
ret = composite_dev_prepare(composite, cdev);
|
|
if (ret)
|
|
return ret;
|
|
/* and now the gadget bind */
|
|
ret = -EINVAL;
|
|
|
|
if (list_empty(&gi->cdev.configs)) {
|
|
pr_err("Need at least one configuration in %s.\n",
|
|
gi->composite.name);
|
|
goto err_comp_cleanup;
|
|
}
|
|
|
|
|
|
list_for_each_entry(c, &gi->cdev.configs, list) {
|
|
struct config_usb_cfg *cfg;
|
|
|
|
cfg = container_of(c, struct config_usb_cfg, c);
|
|
if (list_empty(&cfg->func_list)) {
|
|
pr_err("Config %s/%d of %s needs at least one function.\n",
|
|
c->label, c->bConfigurationValue,
|
|
gi->composite.name);
|
|
goto err_comp_cleanup;
|
|
}
|
|
}
|
|
|
|
/* init all strings */
|
|
if (!list_empty(&gi->string_list)) {
|
|
struct gadget_strings *gs;
|
|
|
|
i = 0;
|
|
list_for_each_entry(gs, &gi->string_list, list) {
|
|
|
|
gi->gstrings[i] = &gs->stringtab_dev;
|
|
gs->stringtab_dev.strings = gs->strings;
|
|
gs->strings[USB_GADGET_MANUFACTURER_IDX].s =
|
|
gs->manufacturer;
|
|
gs->strings[USB_GADGET_PRODUCT_IDX].s = gs->product;
|
|
gs->strings[USB_GADGET_SERIAL_IDX].s = gs->serialnumber;
|
|
i++;
|
|
}
|
|
gi->gstrings[i] = NULL;
|
|
s = usb_gstrings_attach(&gi->cdev, gi->gstrings,
|
|
USB_GADGET_FIRST_AVAIL_IDX);
|
|
if (IS_ERR(s)) {
|
|
ret = PTR_ERR(s);
|
|
goto err_comp_cleanup;
|
|
}
|
|
|
|
gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
|
|
gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
|
|
gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
|
|
}
|
|
|
|
if (gi->use_os_desc) {
|
|
cdev->use_os_string = true;
|
|
cdev->b_vendor_code = gi->b_vendor_code;
|
|
memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
|
|
}
|
|
|
|
/* Go through all configs, attach all functions */
|
|
list_for_each_entry(c, &gi->cdev.configs, list) {
|
|
struct config_usb_cfg *cfg;
|
|
struct usb_function *f;
|
|
struct usb_function *tmp;
|
|
struct gadget_config_name *cn;
|
|
|
|
cfg = container_of(c, struct config_usb_cfg, c);
|
|
if (!list_empty(&cfg->string_list)) {
|
|
i = 0;
|
|
list_for_each_entry(cn, &cfg->string_list, list) {
|
|
cfg->gstrings[i] = &cn->stringtab_dev;
|
|
cn->stringtab_dev.strings = &cn->strings;
|
|
cn->strings.s = cn->configuration;
|
|
i++;
|
|
}
|
|
cfg->gstrings[i] = NULL;
|
|
s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
|
|
if (IS_ERR(s)) {
|
|
ret = PTR_ERR(s);
|
|
goto err_comp_cleanup;
|
|
}
|
|
c->iConfiguration = s[0].id;
|
|
}
|
|
|
|
list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
|
|
list_del(&f->list);
|
|
ret = usb_add_function(c, f);
|
|
if (ret) {
|
|
list_add(&f->list, &cfg->func_list);
|
|
goto err_purge_funcs;
|
|
}
|
|
}
|
|
usb_ep_autoconfig_reset(cdev->gadget);
|
|
}
|
|
if (cdev->use_os_string) {
|
|
ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
|
|
if (ret)
|
|
goto err_purge_funcs;
|
|
}
|
|
|
|
usb_ep_autoconfig_reset(cdev->gadget);
|
|
return 0;
|
|
|
|
err_purge_funcs:
|
|
purge_configs_funcs(gi);
|
|
err_comp_cleanup:
|
|
composite_dev_cleanup(cdev);
|
|
return ret;
|
|
}
|
|
|
|
static void configfs_composite_unbind(struct usb_gadget *gadget)
|
|
{
|
|
struct usb_composite_dev *cdev;
|
|
struct gadget_info *gi;
|
|
|
|
/* the gi->lock is hold by the caller */
|
|
|
|
cdev = get_gadget_data(gadget);
|
|
gi = container_of(cdev, struct gadget_info, cdev);
|
|
|
|
purge_configs_funcs(gi);
|
|
composite_dev_cleanup(cdev);
|
|
usb_ep_autoconfig_reset(cdev->gadget);
|
|
cdev->gadget = NULL;
|
|
set_gadget_data(gadget, NULL);
|
|
}
|
|
|
|
static const struct usb_gadget_driver configfs_driver_template = {
|
|
.bind = configfs_composite_bind,
|
|
.unbind = configfs_composite_unbind,
|
|
|
|
.setup = composite_setup,
|
|
.disconnect = composite_disconnect,
|
|
|
|
.max_speed = USB_SPEED_SUPER,
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "configfs-gadget",
|
|
},
|
|
};
|
|
|
|
static struct config_group *gadgets_make(
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct gadget_info *gi;
|
|
|
|
gi = kzalloc(sizeof(*gi), GFP_KERNEL);
|
|
if (!gi)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
gi->group.default_groups = gi->default_groups;
|
|
gi->group.default_groups[0] = &gi->functions_group;
|
|
gi->group.default_groups[1] = &gi->configs_group;
|
|
gi->group.default_groups[2] = &gi->strings_group;
|
|
gi->group.default_groups[3] = &gi->os_desc_group;
|
|
|
|
config_group_init_type_name(&gi->functions_group, "functions",
|
|
&functions_type);
|
|
config_group_init_type_name(&gi->configs_group, "configs",
|
|
&config_desc_type);
|
|
config_group_init_type_name(&gi->strings_group, "strings",
|
|
&gadget_strings_strings_type);
|
|
config_group_init_type_name(&gi->os_desc_group, "os_desc",
|
|
&os_desc_type);
|
|
|
|
gi->composite.bind = configfs_do_nothing;
|
|
gi->composite.unbind = configfs_do_nothing;
|
|
gi->composite.suspend = NULL;
|
|
gi->composite.resume = NULL;
|
|
gi->composite.max_speed = USB_SPEED_SUPER;
|
|
|
|
mutex_init(&gi->lock);
|
|
INIT_LIST_HEAD(&gi->string_list);
|
|
INIT_LIST_HEAD(&gi->available_func);
|
|
|
|
composite_init_dev(&gi->cdev);
|
|
gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
|
|
gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
|
|
gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
|
|
|
|
gi->composite.gadget_driver = configfs_driver_template;
|
|
|
|
gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
|
|
gi->composite.name = gi->composite.gadget_driver.function;
|
|
|
|
if (!gi->composite.gadget_driver.function)
|
|
goto err;
|
|
|
|
#ifdef CONFIG_USB_OTG
|
|
gi->otg.bLength = sizeof(struct usb_otg_descriptor);
|
|
gi->otg.bDescriptorType = USB_DT_OTG;
|
|
gi->otg.bmAttributes = USB_OTG_SRP | USB_OTG_HNP;
|
|
#endif
|
|
|
|
config_group_init_type_name(&gi->group, name,
|
|
&gadget_root_type);
|
|
return &gi->group;
|
|
err:
|
|
kfree(gi);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
static void gadgets_drop(struct config_group *group, struct config_item *item)
|
|
{
|
|
config_item_put(item);
|
|
}
|
|
|
|
static struct configfs_group_operations gadgets_ops = {
|
|
.make_group = &gadgets_make,
|
|
.drop_item = &gadgets_drop,
|
|
};
|
|
|
|
static struct config_item_type gadgets_type = {
|
|
.ct_group_ops = &gadgets_ops,
|
|
.ct_owner = THIS_MODULE,
|
|
};
|
|
|
|
static struct configfs_subsystem gadget_subsys = {
|
|
.su_group = {
|
|
.cg_item = {
|
|
.ci_namebuf = "usb_gadget",
|
|
.ci_type = &gadgets_type,
|
|
},
|
|
},
|
|
.su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
|
|
};
|
|
|
|
void unregister_gadget_item(struct config_item *item)
|
|
{
|
|
struct gadget_info *gi = to_gadget_info(item);
|
|
|
|
unregister_gadget(gi);
|
|
}
|
|
EXPORT_SYMBOL_GPL(unregister_gadget_item);
|
|
|
|
static int __init gadget_cfs_init(void)
|
|
{
|
|
int ret;
|
|
|
|
config_group_init(&gadget_subsys.su_group);
|
|
|
|
ret = configfs_register_subsystem(&gadget_subsys);
|
|
return ret;
|
|
}
|
|
module_init(gadget_cfs_init);
|
|
|
|
static void __exit gadget_cfs_exit(void)
|
|
{
|
|
configfs_unregister_subsystem(&gadget_subsys);
|
|
}
|
|
module_exit(gadget_cfs_exit);
|