diff options
Diffstat (limited to 'drivers/usb/misc/ehset.c')
| -rw-r--r-- | drivers/usb/misc/ehset.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/usb/misc/ehset.c b/drivers/usb/misc/ehset.c index f87890f9cd26..986d6589f053 100644 --- a/drivers/usb/misc/ehset.c +++ b/drivers/usb/misc/ehset.c @@ -18,6 +18,52 @@ #define TEST_SINGLE_STEP_GET_DEV_DESC 0x0107 #define TEST_SINGLE_STEP_SET_FEATURE 0x0108 +extern const struct usb_device_id *usb_device_match_id(struct usb_device *udev, + const struct usb_device_id *id); + +/* + * A list of USB hubs which requires to disable the power + * to the port before starting the testing procedures. + */ +static const struct usb_device_id ehset_hub_list[] = { + { USB_DEVICE(0x0424, 0x4502) }, + { USB_DEVICE(0x0424, 0x4913) }, + { USB_DEVICE(0x0451, 0x8027) }, + { } +}; + +static int ehset_prepare_port_for_testing(struct usb_device *hub_udev, u16 portnum) +{ + int ret = 0; + + /* + * The USB2.0 spec chapter 11.24.2.13 says that the USB port which is + * going under test needs to be put in suspend before sending the + * test command. Most hubs don't enforce this precondition, but there + * are some hubs which needs to disable the power to the port before + * starting the test. + */ + if (usb_device_match_id(hub_udev, ehset_hub_list)) { + ret = usb_control_msg_send(hub_udev, 0, USB_REQ_CLEAR_FEATURE, + USB_RT_PORT, USB_PORT_FEAT_ENABLE, + portnum, NULL, 0, 1000, GFP_KERNEL); + /* + * Wait for the port to be disabled. It's an arbitrary value + * which worked every time. + */ + msleep(100); + } else { + /* + * For the hubs which are compliant with the spec, + * put the port in SUSPEND. + */ + ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE, + USB_RT_PORT, USB_PORT_FEAT_SUSPEND, + portnum, NULL, 0, 1000, GFP_KERNEL); + } + return ret; +} + static int ehset_probe(struct usb_interface *intf, const struct usb_device_id *id) { @@ -30,24 +76,36 @@ static int ehset_probe(struct usb_interface *intf, switch (test_pid) { case TEST_SE0_NAK_PID: + ret = ehset_prepare_port_for_testing(hub_udev, portnum); + if (!ret) + break; ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE, USB_RT_PORT, USB_PORT_FEAT_TEST, (USB_TEST_SE0_NAK << 8) | portnum, NULL, 0, 1000, GFP_KERNEL); break; case TEST_J_PID: + ret = ehset_prepare_port_for_testing(hub_udev, portnum); + if (!ret) + break; ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE, USB_RT_PORT, USB_PORT_FEAT_TEST, (USB_TEST_J << 8) | portnum, NULL, 0, 1000, GFP_KERNEL); break; case TEST_K_PID: + ret = ehset_prepare_port_for_testing(hub_udev, portnum); + if (!ret) + break; ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE, USB_RT_PORT, USB_PORT_FEAT_TEST, (USB_TEST_K << 8) | portnum, NULL, 0, 1000, GFP_KERNEL); break; case TEST_PACKET_PID: + ret = ehset_prepare_port_for_testing(hub_udev, portnum); + if (!ret) + break; ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE, USB_RT_PORT, USB_PORT_FEAT_TEST, (USB_TEST_PACKET << 8) | portnum, |