文章目录
Linux USB 开发指南
1 前言
1.1 文档简介
介绍 USB 模块配置和调试方法。
1.2 目标读者
USB 模块开发、维护人员。
1.3 适用范围
表 1-1: 适用产品列表
内核版本 | 驱动文件 |
---|---|
Linux-4.9 | drivers/usb/* |
Linux-5.4 | drivers/usb/* |
2 模块介绍
2.1 模块功能介绍
USB 有主机功能和从设备功能。做主机时,能连接 U 盘、USB 鼠标等 USB 设备;做从设备时,具有 ADB 调试等从设备功能。
2.2 相关术语介绍
表 2-1: 术语介绍
术语 | 说明 |
---|---|
USB | Universal Serial Bus, 通用串行总线 |
OTG | On-The-Go |
ADB | Android Debug Bridge,Android 调试桥 |
Gadget | 小配件 |
HCD | Host Controller Driver,主机控制器驱动 |
UDC | USB Device Controller, USB 设备控制器 |
HCI | Host Controller Interface,主机控制器接口 |
EHCI | Enhanced Host Controller Interface,增强型主机控制器接口 |
OHCI | Open Host Controller Interface,开放式主机控制器接口 |
2.3 模块配置介绍
2.3.1 Device Tree 配置说明
设备树中存在的是该类芯片所有平台的模块配置,设备树文件的路径为:kernel/linux-4.9/arch/arm64(32 位平台为 arm)/boot/dts/sunxi/xxx.dtsi(xxx 为具体芯片型号,如 sun50iw10p1 等), 设备树配置如下所示:
• USB0 配置
usbc0:usbc0@0 {
device_type = "usbc0";
compatible = "allwinner,sunxi-otg-manager";
usb_port_type = <2>;
usb_detect_type = <1>;
usb_id_gpio;
usb_det_vbus_gpio;
usb_regulator_io = "nocare";
usb_wakeup_suspend = <0>;
usb_luns = <3>;
usb_serial_unique = <0>;
usb_serial_number = "20080411";
rndis_wceis = <1>;
status = "okay";
};
udc:udc-controller@0x05100000 {
compatible = "allwinner,sunxi-udc";
reg = <0x0 0x05100000 0x0 0x1000>, /*udc base*/
<0x0 0x00000000 0x0 0x100>, /*sram base*/
<0x0 0x05200000 0x0 0x1000>; /*usb1 base, for common circuit*/
interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>; /*设备使用的中断*/
clocks = <&clk_usbphy0>, <&clk_usbotg>, <&clk_usbehci1>, <&clk_usbphy1>; /*设备使用的时钟*/
status = "okay"; /*是否使能该设备*/
};
ehci0:ehci0-controller@0x05101000 {
compatible = "allwinner,sunxi-ehci0";
reg = <0x0 0x05101000 0x0 0xFFF>, /*hci0 base*/
<0x0 0x00000000 0x0 0x100>,
<0x0 0x05100000 0x0 0x1000>,
<0x0 0x07010250 0x0 0x10>, /*prcm base, for usb standby*/
<0x0 0x05200000 0x0 0x1000>; /*usb1 base, for common circuit*/
interrupts = <GIC_SPI 30 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clk_usbphy0>, <&clk_usbehci0>, <&clk_usbehci1>, <&clk_usbphy1>;
hci_ctrl_no = <0>; /*主机控制器的序列*/
status = "okay";
};
ohci0:ohci0-controller@0x05101400 {
compatible = "allwinner,sunxi-ohci0";
reg = <0x0 0x05101000 0x0 0xFFF>, /*hci0 base*/
<0x0 0x00000000 0x0 0x100>,
<0x0 0x05100000 0x0 0x1000>,
<0x0 0x07010250 0x0 0x10>, /*prcm base, for usb standby*/
<0x0 0x05200000 0x0 0x1000>;/*usb1 base, for common circuit*/
interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clk_usbphy0>, <&clk_usbohci0>, <&clk_usbohci1>, <&clk_usbphy1>;
hci_ctrl_no = <0>;
status = "okay";
};
• USB1 配置
usbc1:usbc1@0 {
device_type = "usbc1";
usb_regulator_io = "nocare";
usb_wakeup_suspend = <0>;
status = "okay";
};
ehci1:ehci1-controller@0x05200000 {
compatible = "allwinner,sunxi-ehci1";
reg = <0x0 0x05200000 0x0 0xFFF>,
<0x0 0x00000000 0x0 0x100>,
<0x0 0x05100000 0x0 0x1000>,
<0x0 0x07010250 0x0 0x10>;
interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clk_usbphy1>, <&clk_usbehci1>;
hci_ctrl_no = <1>;
status = "okay";
};
ohci1:ohci1-controller@0x05200400 {
compatible = "allwinner,sunxi-ohci1";
reg = <0x0 0x05200000 0x0 0xFFF>,
<0x0 0x00000000 0x0 0x100>,
<0x0 0x05100000 0x0 0x1000>,
<0x0 0x07010250 0x0 0x10>;
interrupts = <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clk_usbphy1>, <&clk_usbohci1>, <&clk_usbohci1_12m>, <&clk_osc48md4>, <&clk_hosc>, <&clk_losc>;
hci_ctrl_no = <1>;
status = "okay";
};
2.3.2 board.dts 配置说明
board.dts 用于保存每一个板级平台的设备信息(如 demo 板,perf1 板等),里面的配置信息会覆盖上面的 Device Tree 默认配置信息。不同 soc、版型及内核版本对应的 board.dts 具体路径如下:device/config/chips/soc/conf igs/{board}/${内核版本}/board.dts。
• USB0 配置
usbc0:usbc0@0 {
device_type = "usbc0";
usb_port_type = <0x2>;
usb_detect_type = <0x1>;
usb_id_gpio = <&pio PH 8 0 0 0xffffffff 0xffffffff>;
usb_det_vbus_gpio = "axp_ctrl";
usb_regulator_io = "nocare";
det_vbus_supply = <&usb_power_supply>;
usb_wakeup_suspend = <0>;
usb_luns = <3>;
usb_serial_unique = <0>;
usb_serial_number = "20080411";
rndis_wceis = <1>;
status = "okay";
};
注:(1)usb_port_type:usb0口默认的模式。
置0:devcie模式;
置1:host模式;
置2:otg模式。
(2)usb_detect_type:usb0口otg检测模式。
置0:不做检测;
置1:vbus/id检测;
置2:id/dpdm检测。
(3)usb_wakeup_suspend:standby模式。
置0:super standby模式;
置1:usb standby模式,支持远程唤醒。
udc:udc-controller@0x51000000 {
det_vbus_supply = <&usb_power_supply>
}
ehci0:ehci0-controller@0x05101000 {
drvvbus-supply = <®_drivevbus>;
};
ohci0:ohci0-controller@0x05101400 {
drvvbus-supply = <®_drivevbus>;
};
说明
若使用 usb standby 模式,需注意如下:
1、IC 支持远程唤醒;
2、若条件 1 满足,相关硬件部分需严格按照《硬件设计文档》设计;
3、若条件 1、2 满足,额外添加属性 “wakeup-source;”, 启用 usb standby 功能。
• USB1 配置
usbc1:usbc1@0 {
device_type = "usbc1";
usb_regulator_io = "nocare";
usb_wakeup_suspend = <0>;
status = "okay";
};
ehci1:ehci1-controller@0x05200000 {
drvvbus-supply = <®_usb1_vbus>;
};
ohci1:ohci1-controller@0x05200400 {
drvvbus-supply = <®_usb1_vbus>;
};
• Vbus 配置
reg_usb1_vbus: usb1-vbus {
compatible = "regulator-fixed";
gpio = <&pio PH 10 1 2 0 1>;
regulator-name = "usb1-vbus";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
regulator-enable-ramp-delay = <1000>;
enable-active-high;
};
2.3.3 kernel menuconfig 配置说明
进入内核根目录,执行 make ARCH=arm menuconfig(64 位平台为 make ARCH=arm64 menuconfig)进入配置主界面,并按以下步骤操作:
选择 Device Drivers 选项进入下一级配置,如下图所示。
图 2-1: Device Drivers 选项配置
选择 USB support 选项,进入下一级配置,如下图所示。
图 2-2: USB Support 选项配置
打开如下两图的选项,如下图所示。
图 2-3: USB Support 详细配置 1
图 2-4: USB Support 详细配置 2
选择 USB Gadget Support,进入下一级配置,如下图所示。
图 2-5: USB Gadget Support 选项配置
打开下图的选项,并在对应配置中打开所需的功能性配置, 如: 需要存储功能时, 需打开下图中的 “mass storage” 配置, 如下图所示。
图 2-6: USB Gadget Support 详细配置
进入 USB Peripheral Controller,并打开下图选项:
图 2-7: USB Peripheral Controller 详细配置
返回上一级,即 USB support,进入 SUNXI USB2.0 Dual Role controller support,并打开下图选项,如下图所示。
图 2-8: SUNXI USB2.0 Dual Role Controller Support 详细配置
若需支持 MTP PTP 等功能需开启 TYPEC 配置返回上一级,即 USB support,进入 USB Type-C Support,并打开下图选项,如下图所示:
图 2-9: USB Type-C Support 详细配置
2.4 源码结构介绍
USB 驱动的源代码位于内核 drivers/usb 目录下,如下是 sunxi 平台相关源码:
• Host
drivers/usb/host/
├── ehci_sunxi.c
├── ohci_sunxi.c
├── sunxi_hci.c
├── sunxi_hci.h
• UDC 和 Manager
drivers/usb/sunxi_usb/
├── include
│ ├── sunxi_hcd.h
│ ├── sunxi_sys_reg.h
│ ├── sunxi_udc.h
│ ├── sunxi_usb_board.h
│ ├── sunxi_usb_bsp.h
│ ├── sunxi_usb_config.h
│ ├── sunxi_usb_debug.h
│ └── sunxi_usb_typedef.h
├── Kconfig
├── Makefile
├── manager
│ ├── usbc0_platform.c
│ ├── usbc_platform.h
│ ├── usb_hcd_servers.c
│ ├── usb_hcd_servers.h
│ ├── usb_hw_scan.c
│ ├── usb_hw_scan.h
│ ├── usb_manager.c
│ ├── usb_manager.h
│ ├── usb_msg_center.c
│ └── usb_msg_center.h
├── misc
│ └── sunxi_usb_debug.c
├── udc
│ ├── sunxi_udc_board.c
│ ├── sunxi_udc_board.h
│ ├── sunxi_udc.c
│ ├── sunxi_udc_config.h
│ ├── sunxi_udc_debug.c
│ ├── sunxi_udc_debug.h
│ ├── sunxi_udc_dma.c
│ └── sunxi_udc_dma.h
└── usbc
├── usbc.c
├── usbc_dev.c
├── usbc_i.h
└── usbc_phy.c
2.5 驱动框架介绍
Linux 内核提供了完整的 USB 驱动程序框架。USB 总线采用树形结构,在一条总线上只能有唯一的主机设备。Linux 内核从主机和设备两个角度观察 USB 总线结构。下图是 Linux 内核从主机和设备两个角度观察 USB 总线结构的示意图。
图 2-10: USB 驱动总体结构
USB 子系统主要任务包括:
a. 注册和管理设备驱动;
b. USB 设备寻找驱动,并初始化和配置设备;
c. 内核中表现设备的树形结构;
d. 与设备交互。
2.6 Gadget 配置
Gadget 是指具有 USB 设备控制器的 USB 设备,根据具体的功能配置,连接到 PC 后可以作为 mass storage、uac 等设备。Linux 有原生 gadget 框架,通用的配置流程可参考下文。
2.6.1 打开内核配置
需在 “USB functions configurable through configfs” 下选择需要的功能。
图 2-11: linux-4.x usb gadget 配置选择
2.6.2 linux-4.x/linux-5.4 USB Gadget 配置流程
Linux-4.x/Linux-5.4 使用 configfs 框架实现 composite gadget 功能。具体流程如下:
• 挂载 configs:
mount -t configfs none /sys/kernel/config
挂载完成之后在/sys/kernel/config 目录下就会生成 usb_gadget/目录。
• 建立 gadgets:
mkdir /sys/kernel/config/usb_gadget/g1
创建g1/目录之后,该目录下会生成很多配置目录,这里的g1表示 gadget 1,一个 UDC 对应一个 gadget,如果你的 SOC 上有多个 gadget,可以创建多个gx目录。
• 写入 gadget 的 PID、VID、序列号等信息:
echo "VID" > /sys/kernel/config/usb_gadget/g1/idVendor
echo "PID" > /sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
echo "manufacturer" > /sys/kernel/config/usb_gadget/g1/strings/0x409/manufacturer
echo "product" > /sys/kernel/config/usb_gadget/g1/strings/0x409/product
• 建立 gadget 相关配置 configurations
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 > /sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 > /sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
• 建立功能 functions
mkdir /sys/kernel/config/usb_gadget/g1/functions/<name>.<instance name>
:function name :任意字符串
• 建立功能和配置的链接
ln -s /sys/kernel/config/usb_gadget/g1/functions/<name>.<instance name> /sys/kernel/config/
usb_gadget/g1/configs/c.1
• 使能 gadget
echo <udc name> > UDC
常见 Gadget 功能的配置方式见附录。
2.7 端点配置
在 Gadget 配置使用过程中,可能出现端点的默认配置方式无法满足需求的情况,故需对端点进行修改满足需求。可参考现有的端点进行修改。譬如将批量端点改成中断端点,参考现有的中断端点进行修改即可。改动内容包括端点 fifo 大小,端点属性,端点方向。
2.7.1 端点 fifo 大小
以4k平台为例:
static const struct sw_udc_fifo ep_fifo[] = {
{ep0name, 0, 512, 0},/*name, fifo_addr, fifo_size, double_fifo*/
{ep1in_bulk_name, 512, 512, 0},
{ep1out_bulk_name, 1024, 512, 0},
{ep2in_bulk_name, 1536, 512, 0},
{ep2out_bulk_name, 2048, 512, 0},
{ep3_iso_name, 2560, 1024, 0},
{ep4_int_name, 3584, 512, 0},
};
2.7.2 端点的属性
.ep[2] = {
.num = 1,
.ep = {
.name = ep1out_bulk_name,
.ops = &sunxi_udc_ep_ops,
.maxpacket = SW_UDC_EP_FIFO_SIZE,
.maxpacket_limit = SW_UDC_EP_FIFO_SIZE,
.caps = USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK,
USB_EP_CAPS_DIR_OUT),
},
.dev = &sunxi_udc,
.bEndpointAddress = (USB_DIR_OUT | 1),
.bmAttributes = USB_ENDPOINT_XFER_BULK,
},
2.7.3 定义端点的方向
/**
* ep_fifo_in[i] = {n} i: the physic ep index, n: ep_fifo's index for the ep
*
* eg: ep_fifo_in[2] = {3} ===> ep2_in is in ep_fifo[3]
*
* ep3_iso_name and ep4_int_name cannot be tx or rx simultaneously.
*
*/
static const int ep_fifo_in[] = {0, 1, 3, 5, 6, 7};
static const int ep_fifo_out[] = {0, 2, 4, 5, 6, 8};
2.8 调试方法
2.8.1 调试节点
2.8.1.1 USB0 调试节点
查看 USB0 当前 Role
cat /sys/devices/platform/soc/usbc0/otg_role
手动切换到 Host 模式
cat /sys/devices/platform/soc/usbc0/usb_host
手动切换到 Device 模式
cat /sys/devices/platform/soc/usbc0/usb_device
2.8.1.2 USB1 调试节点
卸载主机驱动
通过下述命令找到主机驱动节点及对应路径
find -name ehci_enable
find -name ohci_enable
然后根据上述结果,按如下命令卸载主机驱动 (以 t5 平台为例)
echo 0 > sys/devices/platform/soc/5200000.ehci1-controller/ehci_enable
echo 0 > sys/devices/platform/soc/5200000.ohci1-controller/ohci_enable
加载主机驱动
通过下述命令找到主机驱动节点及对应路径
find -name ehci_enable
find -name ohci_enable
然后根据上述结果,按如下命令加载主机驱动 (以 t5 平台为例)
echo 1 > sys/devices/platform/soc/5200000.ehci1-controller/ehci_enable
echo 1 > sys/devices/platform/soc/5200000.ohci1-controller/ohci_enable
2.8.2 眼图测试
2.8.2.1 USB Device 眼图测试
获取otg_ed_test的路径path
find /sys/ -name otg_ed_test
测试眼图命令
echo test_pack > path/otg_ed_test
2.8.2.2 USB Host 眼图测试
获取ed_test的路径path
find /sys/ -name ed_test
测试眼图命令
echo test_pack > path/ed_test
3 FAQ
3.1 常见问题
3.1.1 USB 基本功能异常排查
3.1.1.1 USB Host 基本功能异常排查步骤
• 多找几个 USB 设备试试,排除个别 USB 设备本身的问题。
• 多更换几根 USB 线缆试试,排除个别 USB 线缆的问题。
• 多找几个 PC 主机做相同的实验,作为参考对比。若在 PC 有相同现象,则认为正常。
• 若硬件有多个 USB 口,尝试同样条件下测试其他 USB 口的主机功能是否正常。
• 样机设备 USB 口外接独立供电的 USB-HUB 设备,再将 USB 设备连接到 USB-HUB 上,确认主机功能是否正常。
• 确认主机驱动是否加载成功。
(1)若为 USB0 口,则可通过如下方式确认:
cat /sys/devices/platform/soc/usbc0/otg_role
(2)若为 USB1 口,可通过如下方式确认:
cat sys/devices/platform/soc/5200000.ehci1-controller/ehci_enable
cat sys/devices/platform/soc/5200000.ohci1-controller/ohci_enable
若为0,则没有加载Host驱动。
• 重新加载 Host 驱动,确认此时功能是否正常。
(1)若为 USB0 口,则可通过如下方式:
方式1:重新插拔OTG线。
方式2:手动切换到Host模式。
(2)若为 USB1 口,则可通过卸载驱动、再加载驱动。
• 对比 SDK 代码与最新发布的代码或者补丁, 确认代码是否更新到最新。
• 同样条件下,分别打印出功能异常板子和功能正常板子的相关寄存器,并进行对比,确认是否有不同之处。
• 出现异常时,测试 USB 高速眼图是否正常。
• 若眼图测试未通过,可尝试调节眼图参数。
3.1.1.2 USB Device 基本功能异常排查步骤
• 多换几个 PC 主机做相同的测试,排除个别 PC 的问题。
• 多更换几根 USB 线缆做相同的测试,排除个别 USB 线缆的问题。
• 确认 Device 驱动是否加载成功,可通过如下方式:
(1)通过 Log。
[ 104.732695] insmod_device_driver
[ 104.732695]
device_chose finished!
(2)通过节点查看当前 Role。
• 重新加载 Device 驱动,确认此时功能是否恢复正常。
(1)重新插拔 USB 线。
(2)手动切换到 Device 模式。
• 对比 SDK 代码与最新发布的代码或者补丁, 确认代码是否更新到最新。
• 同样条件下,分别打印出功能异常板子和功能正常板子的相关寄存器,并进行对比,确认是否有异常。
• 出现异常时,确认 USB 高速眼图是否正常。
3.1.2 配置其他 gadget 功能前关闭 adb 功能时却报异常的解决办法
问题产生的原因是:仅执行./etc/adb_conf.sh stop 只是强制杀死 adb 守护进程,但 adb 功能链接仍存,当配置其他 gadget 功能时,便会复合 adb 链接导致异常,故在需要配置其他 gadget 功能时,除了强制杀死 adb 守护进程还须移除 adb 功能链接,在小机中操作步骤如下:
1、./etc/adb_conf.sh stop
2、umount /sys/kernel/config
3、rm -fr /sys/kernel/config/usb_gadget/g1/configs/c.1/ffs.adb
执行以上操作,正常关闭 adb 后,根据需要的 gadget 功能,参考【附录】章节进行配置即可。
4 附录
4.1 Linux-4.x/Linux-5.4 Gadget 配置示例
4.1.1 小机做 mass storage
dd if=/dev/zero of=/dev/a.bin bs=1M count=100
mount -t configfs none /sys/kernel/config
mkdir /sys/kernel/config/usb_gadget/g1
echo "0x18d1" > /sys/kernel/config/usb_gadget/g1/idVendor
echo "0x0001" > /sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
mkdir /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0
echo /dev/a.bin > /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 > /sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 > /sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
ln -s /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0/ /sys/kernel/config/
usb_gadget/g1/configs/c.1/
ls /sys/class/udc/ | xargs echo > /sys/kernel/config/usb_gadget/g1/UDC
说明
如果需要增加 lun,在 functions/mass_storage.usb0 下:
mkdir lun.1
mkdir lun.2
4.1.2 小机做 cdrom
mount -t configfs none /sys/kernel/config
mkdir /sys/kernel/config/usb_gadget/g1
echo "0x1f3a" > /sys/kernel/config/usb_gadget/g1/idVendor
echo "0xa4ac" > /sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 > /sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 > /sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
mkdir /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0
echo 1 > /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0/lun.0/cdrom
echo /tmp/phoenixcard.iso > /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0/
lun.0/file
ln -s /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0/ /sys/kernel/config/
usb_gadget/g1/configs/c.1/mass_storage.usb0
ls /sys/class/udc/ | xargs echo > /sys/kernel/config/usb_gadget/g1/UDC
说明
/tmp/phoenixcard.iso 根据实际情况更改。
4.1.4 小机做 UAC2
mount -t configfs none /sys/kernel/config
mkdir /sys/kernel/config/usb_gadget/g1
echo "0x1d61" > /sys/kernel/config/usb_gadget/g1/idVendor
echo "0x0101" > /sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
mkdir /sys/kernel/config/usb_gadget/g1/functions/uac2.usb0
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 > /sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 > /sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
ln -s /sys/kernel/config/usb_gadget/g1/functions/uac2.usb0/ /sys/kernel/config/usb_gadget/
g1/configs/c.1/
ls /sys/class/udc/ | xargs echo > /sys/kernel/config/usb_gadget/g1/UDC
4.1.5 小机做 UVC
mount -t configfs none /sys/kernel/config
mkdir /sys/kernel/config/usb_gadget/g1
echo "0x1f3a" > /sys/kernel/config/usb_gadget/g1/idVendor
echo "0x100d" > /sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
mkdir /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0
mkdir -p /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p
echo 1280 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p/wWidth
echo 720 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p/
wHeight
echo 333333 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p/
dwFrameInterval
echo 333333 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p/
dwDefaultFrameInterval
echo 442368000 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p
/dwMinBitRate
echo 442368000 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p
/dwMaxBitRate
echo 1843200 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p/
dwMaxVideoFrameBufferSize
mkdir /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/header/h
ln -s /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/ /sys/kernel/
config/usb_gadget/g1/functions/uvc.usb0/streaming/header/h/
ln -s /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/header/h/ /sys/kernel/
config/usb_gadget/g1/functions/uvc.usb0/streaming/class/fs
ln -s /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/header/h/ /sys/kernel/
config/usb_gadget/g1/functions/uvc.usb0/streaming/class/hs
mkdir /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/control/header/h
ln -s /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/control/header/h/ /sys/kernel/
config/usb_gadget/g1/functions/uvc.usb0/control/class/fs/
ln -s /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/control/header/h/ /sys/kernel/
config/usb_gadget/g1/functions/uvc.usb0/control/class/ss/
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 > /sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 > /sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
ln -s /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/ /sys/kernel/config/usb_gadget/g1
/configs/c.1/
ls /sys/class/udc/ | xargs echo > /sys/kernel/config/usb_gadget/g1/UDC
4.1.6 小机做 HID
mount -t configfs none /sys/kernel/config/
mkdir /sys/kernel/config/usb_gadget/g1
echo 0x0525 >/sys/kernel/config/usb_gadget/g1/idVendor
echo 0xa4ac >/sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
mkdir /sys/kernel/config/usb_gadget/g1/functions/hid.usb0
echo 512 >/sys/kernel/config/usb_gadget/g1/functions/hid.usb0/report_length
echo -ne <report_desc> >/sys/kernel/config/usb_gadget/g1/functions/hid.usb0/report_desc
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 >/sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 >/sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
ln -s /sys/kernel/config/usb_gadget/g1/functions/hid.usb0/ /sys/kernel/config/usb_gadget/g1/configs/c.1/
ls /sys/class/udc/ | xargs echo > /sys/kernel/config/usb_gadget/g1/UDC
说明
report_desc 根据需求自定义。
4.1.7 小机做 rndis
mount -t configfs none /sys/kernel/config
mkdir /sys/kernel/config/usb_gadget/g1
echo "0x1f3a" > /sys/kernel/config/usb_gadget/g1/idVendor
echo "0x200a" > /sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
mkdir /sys/kernel/config/usb_gadget/g1/functions/rndis.usb0
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 > /sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 > /sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
ln -s /sys/kernel/config/usb_gadget/g1/functions/rndis.usb0/ /sys/kernel/config/usb_gadget/g1/configs/c.1/rndis.usb0
ls /sys/class/udc/ | xargs echo > /sys/kernel/config/usb_gadget/g1/UDC
4.1.8 小机做 acm
mount -t configfs none /sys/kernel/config
mkdir /sys/kernel/config/usb_gadget/g1
echo "0x1f3a" > /sys/kernel/config/usb_gadget/g1/idVendor
echo "0x0007" > /sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
mkdir /sys/kernel/config/usb_gadget/g1/functions/acm.usb0
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 > /sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 > /sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
ln -s /sys/kernel/config/usb_gadget/g1/functions/acm.usb0/ /sys/kernel/config/usb_gadget/g1/configs/c.1/acm.usb0
ls /sys/class/udc/ | xargs echo > /sys/kernel/config/usb_gadget/g1/UDC
4.1.9 小机做 adb
mount -t configfs none /sys/kernel/config
mkdir /sys/kernel/config/usb_gadget/g1
echo "0x18d1" > /sys/kernel/config/usb_gadget/g1/idVendor
echo "0x0002" > /sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
echo "20080411" > /sys/kernel/config/usb_gadget/g1/strings/0x409/serialnumber
echo "Android" > /sys/kernel/config/usb_gadget/g1/strings/0x409/manufacturer
mkdir /sys/kernel/config/usb_gadget/g1/functions/ffs.adb
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 > /sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 > /sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
ln -s /sys/kernel/config/usb_gadget/g1/functions/ffs.adb/ /sys/kernel/config/usb_gadget/g1/
configs/c.1/ffs.adb
mkdir /dev/usb-ffs
mkdir /dev/usb-ffs/adb
mount -o uid=2000,gid=2000 -t functionfs adb /dev/usb-ffs/adb/
ls /sys/class/udc/ | xargs echo > /sys/kernel/config/usb_gadget/g1/UDC
4.1.10 小机做 mass storage+adb
mount -t configfs none /sys/kernel/config
mkdir /sys/kernel/config/usb_gadget/g1
echo "0x18d1" > /sys/kernel/config/usb_gadget/g1/idVendor
echo "0x0003" > /sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
echo "20080411" > /sys/kernel/config/usb_gadget/g1/strings/0x409/serialnumber
echo "Android" > /sys/kernel/config/usb_gadget/g1/strings/0x409/manufacturer
mkdir /sys/kernel/config/usb_gadget/g1/functions/ffs.adb
mkdir /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0
echo ${BLOCK_PATH} > /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 > /sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 > /sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
ln -s /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0/ /sys/kernel/config/
usb_gadget/g1/configs/c.1/mass_storage.usb0
ln -s /sys/kernel/config/usb_gadget/g1/functions/ffs.adb/ /sys/kernel/config/usb_gadget/g1/
configs/c.1/ffs.adb
mkdir /dev/usb-ffs
mkdir /dev/usb-ffs/adb
mount -o uid=2000,gid=2000 -t functionfs adb /dev/usb-ffs/adb/
ls /sys/class/udc/ | xargs echo > /sys/kernel/config/usb_gadget/g1/UDC
4.1.11 小机做 uvc+uac1
mount -t configfs none /sys/kernel/config
mkdir /sys/kernel/config/usb_gadget/g1
echo "0x1f3a" > /sys/kernel/config/usb_gadget/g1/idVendor
echo "0x100d" > /sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
mkdir /sys/kernel/config/usb_gadget/g1/functions/uac1.usb0
mkdir /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0
mkdir -p /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p
echo 1280 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p/wWidth
echo 720 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p/wHeight
echo 333333 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p/dwFrameInterval
echo 333333 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p/dwDefaultFrameInterval
echo 442368000 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p/dwMinBitRate
echo 442368000 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p/dwMaxBitRate
echo 1843200 > /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/720p/dwMaxVideoFrameBufferSize
mkdir /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/header/h
ln -s /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/mjpeg/m/ /sys/kernel/
config/usb_gadget/g1/functions/uvc.usb0/streaming/header/h/
ln -s /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/header/h/ /sys/kernel/
config/usb_gadget/g1/functions/uvc.usb0/streaming/class/fs
ln -s /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/streaming/header/h/ /sys/kernel/
config/usb_gadget/g1/functions/uvc.usb0/streaming/class/hs
mkdir /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/control/header/h
ln -s /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/control/header/h/ /sys/kernel/
config/usb_gadget/g1/functions/uvc.usb0/control/class/fs/
ln -s /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/control/header/h/ /sys/kernel/
config/usb_gadget/g1/functions/uvc.usb0/control/class/ss/
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 > /sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 > /sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
ln -s /sys/kernel/config/usb_gadget/g1/functions/uvc.usb0/ /sys/kernel/config/usb_gadget/g1
/configs/c.1/
ln -s /sys/kernel/config/usb_gadget/g1/functions/uac1.usb0/ /sys/kernel/config/usb_gadget/g1/configs/c.1/
ls /sys/class/udc/ | xargs echo > /sys/kernel/config/usb_gadget/g1/UDC
4.1.12 小机做 hid+cdrom
mount -t configfs none /sys/kernel/config
mkdir /sys/kernel/config/usb_gadget/g1
echo "0x1f3a" > /sys/kernel/config/usb_gadget/g1/idVendor
echo "0xa4ac" > /sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 > /sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 > /sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
mkdir /sys/kernel/config/usb_gadget/g1/functions/hid.usb0
mkdir /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0
echo 512 >/sys/kernel/config/usb_gadget/g1/functions/hid.usb0/report_length
echo -ne <report_desc> >/sys/kernel/config/usb_gadget/g1/functions/hid.usb0/report_desc
ln -s /sys/kernel/config/usb_gadget/g1/functions/hid.usb0/ /sys/kernel/config/usb_gadget/g1/configs/c.1/hid.usb0
echo 1 > /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0/lun.0/cdrom
echo /tmp/phoenixcard.iso > /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file
ln -s /sys/kernel/config/usb_gadget/g1/functions/mass_storage.usb0/ /sys/kernel/config/usb_gadget/g1/configs/c.1/mass_storage.usb0
ls /sys/class/udc/ | xargs echo > /sys/kernel/config/usb_gadget/g1/UDC
4.1.13 小机做 rndis+adb
mount -t configfs none /sys/kernel/config
mkdir /sys/kernel/config/usb_gadget/g1
echo "0x18d1" > /sys/kernel/config/usb_gadget/g1/idVendor
echo "0x0010" > /sys/kernel/config/usb_gadget/g1/idProduct
mkdir /sys/kernel/config/usb_gadget/g1/strings/0x409
mkdir /sys/kernel/config/usb_gadget/g1/functions/ffs.adb
mkdir /sys/kernel/config/usb_gadget/g1/functions/rndis.usb0
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1
echo 0xc0 >/sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes
echo 500 >/sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
mkdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
ln -s /sys/kernel/config/usb_gadget/g1/functions/rndis.usb0/ /sys/kernel/config/usb_gadget/g1/configs/c.1/rndis.usb0
ln -s /sys/kernel/config/usb_gadget/g1/functions/ffs.adb/ /sys/kernel/config/usb_gadget/g1/configs/c.1/ffs.adb
mkdir /dev/usb-ffs
mkdir /dev/usb-ffs/adb
mount -o uid=2000,gid=2000 -t functionfs adb /dev/usb-ffs/adb/
ls/sys/class/udc/|xargs echo>/sys/kernel/config/usb_gadget/g1/UDC