The i.MX6 universal serial bus (USB) driver implements a standard Linux driver interface to the CHIPIDEA USB-HS On-The-Go (OTG) controller. The CHIPIDEA USB controller is enhanced host controller interface (EHCI) compliant.
The ConnectCore 6 system-on-module has one USB OTG port with integrated PHY and three USB Host ports.
Kernel configuration
You can manage the USB Host support through the kernel configuration options:
- Support for Host-side USB (CONFIG_USB)
- EHCI HCD (USB 2.0) support (CONFIG_USB_EHCI_HCD)
- ChipIdea Highspeed Dual Role Controller (CONFIG_USB_CHIPIDEA)
- ChipIdea device controller (CONFIG_USB_CHIPIDEA_UDC)
- ChipIdea host controller (CONFIG_USB_CHIPIDEA_HOST)
- Freescale MXS USB PHY support (CONFIG_USB_MXS_PHY)
Microsoft provides drivers for several USB device classes approved by USB-IF. These drivers and their installation files are included in Windows. They are available in the Windows System32 DriverStore FileRepository folder. See, USB device class drivers included in Windows. There are actually two USB 3.0 Type B connectors, USB 3.0 Standard-B and USB 3.0 Powered-B. The plugs and receptacles are identical in shape and follow the physical compatibility rules already outlined, but USB 3.0 Powered-B connectors have two additional pins to provide power, for a total of eleven pins. To get a list of the connected USB devices on the USB Host port, use the command lsusb. # lsusb Bus 001 Device 004: ID 0781:5530 SanDisk Corp. Cruzer Bus 001 Device 002: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub. Its instant plug and play feature allows a user to connect 2 RS-232 devices to their laptop or workstation via the USB port. It has certified drivers for Windows and Linux. It is capable of converting a USB port into a 9-pin male RS-232 serial port of high speeds. It is an ideal solution for standard applications that require serial connection.
Intel® Core™ 2 Duo / Quad processors in LGA775 Package (FSB 1333/1066/800).
You can manage the USB OTG support through the kernel configuration option:
- OTG support (CONFIG_USB_OTG)
All kernel configuration options are enabled as built-in on the default ConnectCore 6 SBC kernel configuration file.
Platform driver mapping
The i.MX6 USB Host driver is located at drivers/usb/. Download visual presenter v2 driver.
| File | Description |
|---|---|
| chipidea/core.c | Chipidea IP core driver |
| chipidea/udc.c | Chipidea peripheral driver |
| chipidea/host.c | Chipidea host driver |
| chipidea/ci_hdrc_imx.c | i.MX glue layer |
| chipidea/usbmisc_imx.c | i.MX SoC abstract layer |
| phy/phy-mxs-usb.c | i.MX USB physical driver |
The USB OTG driver for the ConnectCore 6 system-on-module includes the USB Host driver sources and the following sources located at driver/usb/chipidea.
| File | Description |
|---|---|
| otg.c | Chipidea OTG driver |
| otg_fsm.c | Chipidea OTG HNP and SRP driver |
Device tree bindings and customization
USB Host
The i.MX6 USB Host interface device tree binding is documented at Documentation/devicetree/bindings/usb/fsl-usb.txt.
The USB Host interface is defined in the i.MX6 CPU and ConnectCore 6 SBC device tree files.
Definition of the USB Host
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IOMUX configuration
The USB Host uses dedicated pins for the USB Host interface. No IOMUX configuration is necessary.
USB host enabling and parameters
USB OTG
The i.MX6 USB OTG interface device tree binding is documented at Documentation/devicetree/bindings/usb/usbmisc-imx.txt.
The USB OTG interface is defined in the i.MX6 CPU, ConnectCore 6 system-on-module, and ConnectCore 6 SBC device tree files.
Definition of the USB OTG
IOMUX configuration
USB OTG enabling and parameters
USB Host/On-The-Go user space usage examples
Drivers Standard Microsystems Port Devices Inc
The USB Host device driver exposes the connected devices through the file system at /dev/bus/usb/.
Download windows 10. Linux identifies USB devices as soon as they are plugged in. Depending on the log level, the serial console may display a message reporting that the USB device has been plugged in. For example, plugging in a USB memory stick displays this message:
If no message is displayed on the console, you can view all the system messages by printing the contents of the system log file:
To get a list of the connected USB devices on the USB Host port, use the command lsusb:.
To get more detailed information on the connected USB device, use
where the first numbered folder corresponds to the bus number and the second to the device number.
USB memory sticks
Linux automatically mounts USB memory sticks' partitions as /media/sdxN, where x is a letter and N the index of the partition (starting at 1).
If Linux does not automatically mount a partition, you can mount it manually. Use the mount command, passing the corresponding file system type with -t option and the mount point folder; for example, for a FAT32 file system:
Other USB input devices
Other USB input devices, such as a mouse or a keyboard, can be used immediately after being connected. For example, connect a keyboard to a USB connector. Then, run the following command to dump the keyboard key events:
Symptoms
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If you quickly and repeatedly insert and remove a USB device, the USB port may stop responding. When the port is in this state, it no longer recognizes any USB device, and the USB device will not work.
This article helps you fix the problem.
Prerequisites
You must use administrative credentials to log on to Windows to perform some of the troubleshooting methods that are listed in this article. If this is your personal computer, you are likely already logged on with an administrator account. If this is a computer that is part of a network at work, you might have to ask the system administrator for help.
Resolution
To fix this problem, use the following methods in the order in which they are listed. After each method, check the USB device to see whether the problem is fixed. If the problem is not fixed, try the next method.
This article also includes a workaround that you can try if these methods do not work.
Method 1: Use Device Manager to scan for hardware changes
Use Device Manager to scan for hardware changes. After your computer scans for hardware changes, it might recognize the USB device that is connected to the USB port so that you can use the device.
To scan for hardware changes, follow these steps:
Click Start, and then click Run.
Note If you are running Windows Vista, click Start, and then use the Start Search box.Type devmgmt.msc, and then click OK. Device Manager opens.
In Device Manager, click your computer so that it is highlighted.
Click Action, and then click Scan for hardware changes.
Check the USB device to see whether it is working.
If scanning for hardware changes fixed the problem, you are finished. If this method did not fix the problem, go to Method 2.
Method 2: Restart the computer
If scanning for new hardware did not fix the problem, try restarting the computer. After the computer has restarted, check the USB device to see whether it is working.
If restarting the computer fixed the problem, you are finished. If this method did not fix the problem, go to Method 3.
Method 3: Disable and re-enable the USB controller
Use Device Manager to disable and re-enable all the USB controllers. This lets the controllers recover the USB port from its unresponsive condition. The USB controllers represent the USB ports in Device Manager. If you are not comfortable with advanced troubleshooting, try the steps in the 'Workaround' section.
To disable and re-enable the USB controllers, follow these steps:
Click Start, and then click Run.
Note If you are running Windows Vista, click Start, and then use the Start Search box.Type devmgmt.msc, and then click OK. Device Manager opens.
Expand Universal Serial Bus controllers.
Note You might have to scroll down the list to find this item.Right-click the first USB controller under Universal Serial Bus controllers, and then click Uninstall to remove it.
Repeat step 4 for each USB controller that is listed under Universal Serial Bus controllers.
Restart the computer. After the computer starts, Windows will automatically scan for hardware changes and reinstall all the USB controllers that you uninstalled.
Check the USB device to see whether it is working.
If the USB port recognizes the device and if you can use the device, you are finished.
If this method fixed the problem, you are finished. If this method did not fix the problem, go to the 'Workaround' section.
Workaround
If none of these methods worked for you, you can disable the Selective Suspend feature. However, be aware that when the Selective Suspend feature is disabled, all USB host controller drivers (and therefore all USB ports and connected USB devices) in the system are affected. Therefore, your computer cannot suspend any USB devices that are connected to it, and the USB devices can continue to use power while connected to the computer. Additionally, the Allow the computer to turn off this device to save power check box does not appear on the Power Management tab for the USB Root Hub.
This section is intended for an advanced computer user.
You can disable the USB Selective Suspend feature as a workaround by editing the registry. The USB device may become unresponsive because of a race condition in the Selective Suspend feature. The Selective Suspend feature suspends the USB device to efficiently maintain battery power by enabling the computer to turn off the USB device. However, sometimes this feature may not correctly wake up the USB device. Therefore, the USB device is unresponsive when you try to use it.
You might want to disable this feature for server products where power management is not important or required.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in WindowsTo disable the Selective Suspend feature, follow these steps:
Click Start, and then click Run.
Note If you are running Windows Vista, click Start, and then use the Start Search box.Type regedit, and then click OK. Registry Editor opens.
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINESystemCurrentControlSetServicesUSB
If the DisableSelectiveSuspend registry entry is present, double-click it. If it is not present, create the entry. To create the entry, follow these steps:
On the Edit menu, point to New, and then click DWORD.
Type DisableSelectiveSuspend, and then press ENTER.
On the Edit menu, click Modify.
In the Value data field, type 1 to disable the Selective Suspend feature, and then click OK.
Now go to the 'Did this fix the problem?' section.
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Cause
This problem may occur because of a timing issue that prevents the computer from detecting the USB device.
Microsoft and the hardware vendors that manufacture the chips that are used for USB have investigated the problem. However, the results were inconclusive because of the intermittent nature of the problem.
Status
Microsoft is researching this problem and will post more information in this article when the information becomes available.