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- Introduction
- ============
- A USB high speed host must pass electrical compliance tests defined
- by the USB-IF. These compliance tests require the host controller to
- support various test modes defined by the USB 2.0 specification.
- USB-IF defines a standard method to initiate the test modes on an
- embedded host controller by using a test fixture. During enumeration
- by the USB host, this test fixture provides a Vendor-Id/Product-Id
- (or VID/PID) pair which is used by the host to initiate a particular
- test mode as each VID/PID pair corresponds to a unique test mode.
- Hardware description
- ====================
- The driver doesn't require any new hardware and is like any other
- USB host class driver. It gets notified when a Test Fixture device is
- connected to the host.
- The test modes that can be initiated are specific to the high speed
- hosts controllers only.
- Software description
- ====================
- This EHSET (or Embedded High Speed Electrical Test) driver registers
- itself with USB core as the preferred driver for the Test Fixture
- device. During registration it provides the list of the various
- VID/PID pairs which the Test Fixture may present during enumeration.
- The VID is always 0x1A0A, and the PIDs presented by the Test Fixture
- correspond to the following test modes:
- __________________________________________________
- PID Test Mode
- --------------------------------------------------
- 0x0101 TEST_SE0_NAK
- 0x0102 TEST_J
- 0x0103 TEST_K
- 0x0104 TEST_PACKET
- 0x0106 HS_HOST_PORT_SUSPEND_RESUME
- 0x0107 SINGLE_STEP_GET_DEV_DESC
- 0x0108 SINGLE_STEP_SET_FEATURE
- --------------------------------------------------
- The control flow is as follows:
- 1. USB core notifies the ehset driver when a device (Test Fixture) is
- attached to the host having the VID/PID pair as one of the specified
- above.
- 2. EHSET driver checks the PID which the Test Fixture presented during
- enumeration and then initiates the corresponding test mode.
- Dependencies
- ============
- The driver depends on the USB EHCI Host support.
- Other
- =====
- The driver's code shall be added as a new file in the
- /kernel/drivers/usb/misc directory.
- Embedded High-speed Electrical Test Procedure document is available
- at:
- http://www.usb.org/developers/onthego/EHSET_v1.01.pdf
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