1008 lines
24 KiB
C
1008 lines
24 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/usb/composite.h>
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#include <linux/usb/gadget_configfs.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 *default_groups[4];
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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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};
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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 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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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;
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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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if (!(val & USB_CONFIG_ATT_ONE))
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return -EINVAL;
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if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
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USB_CONFIG_ATT_WAKEUP))
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return -EINVAL;
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cfg->c.bmAttributes = val;
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return len;
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}
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#define CFG_CONFIG_DESC_ITEM_ATTR(name) \
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static struct config_usb_cfg_attribute gadget_usb_cfg_##name = \
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__CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
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gadget_config_desc_##name##_show, \
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gadget_config_desc_##name##_store)
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CFG_CONFIG_DESC_ITEM_ATTR(MaxPower);
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CFG_CONFIG_DESC_ITEM_ATTR(bmAttributes);
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static struct configfs_attribute *gadget_config_attrs[] = {
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&gadget_usb_cfg_MaxPower.attr,
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&gadget_usb_cfg_bmAttributes.attr,
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NULL,
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};
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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_PTR(PTR_ERR(fi));
|
|
|
|
ret = config_item_set_name(&fi->group.cg_item, 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 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);
|
|
|
|
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 atleast 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 atleast 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;
|
|
}
|
|
|
|
/* 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)
|
|
goto err_purge_funcs;
|
|
}
|
|
usb_ep_autoconfig_reset(cdev->gadget);
|
|
}
|
|
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;
|
|
|
|
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);
|
|
|
|
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),
|
|
};
|
|
|
|
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);
|