diff options
| author | Sarah Sharp | 2012-07-06 02:17:24 +0200 |
|---|---|---|
| committer | Sarah Sharp | 2012-07-11 13:06:48 +0200 |
| commit | 024f117c2f3c4bb5df6e6696b709e0f3ed7e5dbb (patch) | |
| tree | 3ad556877608c58bd7844f82810dfc0d471d4f63 /drivers/usb | |
| parent | USB: Enable Latency Tolerance Messaging (LTM). (diff) | |
| download | kernel-qcow2-linux-024f117c2f3c4bb5df6e6696b709e0f3ed7e5dbb.tar.gz kernel-qcow2-linux-024f117c2f3c4bb5df6e6696b709e0f3ed7e5dbb.tar.xz kernel-qcow2-linux-024f117c2f3c4bb5df6e6696b709e0f3ed7e5dbb.zip | |
USB: Add a sysfs file to show LTM capabilities.
USB 3.0 devices can optionally support Latency Tolerance Messaging
(LTM). Add a new sysfs file in the device directory to show whether a
device is LTM capable. This file will be present for both USB 2.0 and
USB 3.0 devices.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/core/hub.c | 7 | ||||
| -rw-r--r-- | drivers/usb/core/sysfs.c | 10 |
2 files changed, 10 insertions, 7 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index b5bd6bd8fd12..d739f966b5a8 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2610,13 +2610,6 @@ static int check_port_resume_type(struct usb_device *udev, return status; } -static bool usb_device_supports_ltm(struct usb_device *udev) -{ - if (udev->speed != USB_SPEED_SUPER || !udev->bos || !udev->bos->ss_cap) - return false; - return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT; -} - int usb_disable_ltm(struct usb_device *udev) { struct usb_hcd *hcd = bus_to_hcd(udev->bus); diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c index 777f03c37725..682e8256b95d 100644 --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -253,6 +253,15 @@ show_removable(struct device *dev, struct device_attribute *attr, char *buf) } static DEVICE_ATTR(removable, S_IRUGO, show_removable, NULL); +static ssize_t +show_ltm_capable(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (usb_device_supports_ltm(to_usb_device(dev))) + return sprintf(buf, "%s\n", "yes"); + return sprintf(buf, "%s\n", "no"); +} +static DEVICE_ATTR(ltm_capable, S_IRUGO, show_ltm_capable, NULL); + #ifdef CONFIG_PM static ssize_t @@ -649,6 +658,7 @@ static struct attribute *dev_attrs[] = { &dev_attr_authorized.attr, &dev_attr_remove.attr, &dev_attr_removable.attr, + &dev_attr_ltm_capable.attr, NULL, }; static struct attribute_group dev_attr_grp = { |