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ehset_compliance.txt

ehset_compliance.txt 2.2 KB
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  1. Introduction
    2. 

  2. ============
    3. 

  3. 

  4. A USB high speed host must pass electrical compliance tests defined
    5. 

  5. by the USB-IF. These compliance tests require the host controller to
    6. 

  6. support various test modes defined by the USB 2.0 specification.
    7. 

  7. 

  8. USB-IF defines a standard method to initiate the test modes on an
    9. 

  9. embedded host controller by using a test fixture. During enumeration
    10. 

  10. by the USB host, this test fixture provides a Vendor-Id/Product-Id
    11. 

  11. (or VID/PID) pair which is used by the host to initiate a particular
    12. 

  12. test mode as each VID/PID pair corresponds to a unique test mode.
    13. 

  13. 

  14. Hardware description
    15. 

  15. ====================
    16. 

  16. 

  17. The driver doesn't require any new hardware and is like any other
    18. 

  18. USB host class driver. It gets notified when a Test Fixture device is
    19. 

  19. connected to the host.
    20. 

  20. 

  21. The test modes that can be initiated are specific to the high speed
    22. 

  22. hosts controllers only.
    23. 

  23. 

  24. Software description
    25. 

  25. ====================
    26. 

  26. 

  27. This EHSET (or Embedded High Speed Electrical Test) driver registers
    28. 

  28. itself with USB core as the preferred driver for the Test Fixture
    29. 

  29. device. During registration it provides the list of the various
    30. 

  30. VID/PID pairs which the Test Fixture may present during enumeration.
    31. 

  31. The VID is always 0x1A0A, and the PIDs presented by the Test Fixture
    32. 

  32. correspond to the following test modes:
    33. 

  33. 

  34. __________________________________________________
    35. 

  35. 	 PID		Test Mode
    36. 

  36. --------------------------------------------------
    37. 

  37. 	0x0101		TEST_SE0_NAK
    38. 

  38. 	0x0102		TEST_J
    39. 

  39. 	0x0103		TEST_K
    40. 

  40. 	0x0104		TEST_PACKET
    41. 

  41. 	0x0106		HS_HOST_PORT_SUSPEND_RESUME
    42. 

  42. 	0x0107		SINGLE_STEP_GET_DEV_DESC
    43. 

  43. 	0x0108		SINGLE_STEP_SET_FEATURE
    44. 

  44. --------------------------------------------------
    45. 

  45. 

  46. The control flow is as follows:
    47. 

  47. 

  48. 1. USB core notifies the ehset driver when a device (Test Fixture) is
    49. 

  49. attached to the host having the VID/PID pair as one of the specified
    50. 

  50. above.
    51. 

  51. 

  52. 2. EHSET driver checks the PID which the Test Fixture presented during
    53. 

  53. enumeration and then initiates the corresponding test mode.
    54. 

  54. 

  55. 

  56. Dependencies
    57. 

  57. ============
    58. 

  58. 

  59. The driver depends on the USB EHCI Host support.
    60. 

  60. 

  61. Other
    62. 

  62. =====
    63. 

  63. 

  64. The driver's code shall be added as a new file in the
    65. 

  65. /kernel/drivers/usb/misc directory.
    66. 

  66. 

  67. Embedded High-speed Electrical Test Procedure document is available
    68. 

  68. at:
    69. 

  69. http://www.usb.org/developers/onthego/EHSET_v1.01.pdf
    70. 

  70.