diff options
| author |   Kevin Strasser <kevin.strasser@linux.intel.com> | 2015-06-16 10:35:30 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-22 15:45:03 -0700 |
| commit | 655fe4effe0f1f40e4f6ca6b3cc64a7fe0032183 (patch) | |
| tree | 00e7be3af68a08b25e6688fc8d4571124b81d704 /drivers/usb/core/sysfs.c | |
| parent | USB: bcma: add support for controlling bus power through GPIO (diff) | |
| download | linux-dev-655fe4effe0f1f40e4f6ca6b3cc64a7fe0032183.tar.xz linux-dev-655fe4effe0f1f40e4f6ca6b3cc64a7fe0032183.zip | |
usbcore: add sysfs support to xHCI usb3 hardware LPM
Add a sysfs node to make it easier to verify if LPM is supported and being
enabled for USB 3.0 devices.
Signed-off-by: Kevin Strasser <kevin.strasser@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core/sysfs.c')
| -rw-r--r-- | drivers/usb/core/sysfs.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c index d26973844a4d..cfc68c11c3f5 100644 --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -531,6 +531,25 @@ static ssize_t usb2_lpm_besl_store(struct device *dev, } static DEVICE_ATTR_RW(usb2_lpm_besl); +static ssize_t usb3_hardware_lpm_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct usb_device *udev = to_usb_device(dev); + const char *p; + + usb_lock_device(udev); + + if (udev->usb3_lpm_enabled) + p = "enabled"; + else + p = "disabled"; + + usb_unlock_device(udev); + + return sprintf(buf, "%s\n", p); +} +static DEVICE_ATTR_RO(usb3_hardware_lpm); + static struct attribute *usb2_hardware_lpm_attr[] = { &dev_attr_usb2_hardware_lpm.attr, &dev_attr_usb2_lpm_l1_timeout.attr, @@ -542,6 +561,15 @@ static struct attribute_group usb2_hardware_lpm_attr_group = { .attrs = usb2_hardware_lpm_attr, }; +static struct attribute *usb3_hardware_lpm_attr[] = { + &dev_attr_usb3_hardware_lpm.attr, + NULL, +}; +static struct attribute_group usb3_hardware_lpm_attr_group = { + .name = power_group_name, + .attrs = usb3_hardware_lpm_attr, +}; + static struct attribute *power_attrs[] = { &dev_attr_autosuspend.attr, &dev_attr_level.attr, @@ -564,6 +592,9 @@ static int add_power_attributes(struct device *dev) if (udev->usb2_hw_lpm_capable == 1) rc = sysfs_merge_group(&dev->kobj, &usb2_hardware_lpm_attr_group); + if (udev->lpm_capable == 1) + rc = sysfs_merge_group(&dev->kobj, + &usb3_hardware_lpm_attr_group); } return rc; |