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| author | Manu Gautam <mgautam@codeaurora.org> | 2013-08-09 03:49:24 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-13 00:13:32 +0400 |
| commit | 9841f37a1cca5357c1fd198b1068c12955aa632f (patch) | |
| tree | 699645c1da5f3f926b1950a7d5136013e3625172 /drivers/usb/misc | |
| parent | c10750b2bee7677fe76c97c53e079937802dc68c (diff) | |
| download | linux-9841f37a1cca5357c1fd198b1068c12955aa632f.tar.xz | |
usb: ehci: Add support for SINGLE_STEP_SET_FEATURE test of EHSET
The USB Embedded High-speed Host Electrical Test (EHSET) defines the
SINGLE_STEP_SET_FEATURE test as follows:
1) The host enumerates the test device with VID:0x1A0A, PID:0x0108
2) The host sends the SETUP stage of a GetDescriptor(Device)
3) The device ACKs the request
4) The host issues SOFs for 15 seconds allowing the test operator to
raise the scope trigger just above the SOF voltage level
5) The host sends the IN packet
6) The device sends data in response, triggering the scope
7) The host sends an ACK in response to the data
This patch adds additional handling to the EHCI hub driver and allows
the EHSET driver to initiate this test mode by issuing a a SetFeature
request to the root hub with a Test Selector value of 0x06. From there
it mimics ehci_urb_enqueue() but separately submits QTDs for the
SETUP and DATA/STATUS stages in order to insert a delay in between.
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
[jackp@codeaurora.org: imported from commit c2084930 on codeaurora.org;
minor cleanup and updated author email]
Signed-off-by: Jack Pham <jackp@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/misc')
| -rw-r--r-- | drivers/usb/misc/ehset.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/usb/misc/ehset.c b/drivers/usb/misc/ehset.c index d2864b3f41fe..c31b4a33e6bb 100644 --- a/drivers/usb/misc/ehset.c +++ b/drivers/usb/misc/ehset.c @@ -96,7 +96,25 @@ static int ehset_probe(struct usb_interface *intf, kfree(buf); break; case TEST_SINGLE_STEP_SET_FEATURE: - /* unsupported for now */ + /* + * GetDescriptor SETUP request -> 15secs delay -> IN & STATUS + * + * Note, this test is only supported on root hubs since the + * SetPortFeature handling can only be done inside the HCD's + * hub_control callback function. + */ + if (hub_udev != dev->bus->root_hub) { + dev_err(&intf->dev, "SINGLE_STEP_SET_FEATURE test only supported on root hub\n"); + break; + } + + ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0), + USB_REQ_SET_FEATURE, USB_RT_PORT, + USB_PORT_FEAT_TEST, + (6 << 8) | portnum, + NULL, 0, 60 * 1000); + + break; default: dev_err(&intf->dev, "%s: unsupported PID: 0x%x\n", __func__, test_pid); |