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| author | Sarah Sharp <sarah.a.sharp@intel.com> | 2007-10-03 21:56:03 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-10-12 21:55:30 (GMT) |
| commit | 4d59d8a11383ebf0e0260ee481a4e766959fd7d9 (patch) | |
| tree | 240cf81cc56896a69c1467b7c8bc4f3f4022c3fd /drivers/usb/core/sysfs.c | |
| parent | 437f375f262417b484f28007c3e8d21bd01d0e01 (diff) | |
| download | linux-4d59d8a11383ebf0e0260ee481a4e766959fd7d9.tar.xz | |
USB: Export URB statistics for powertop
powertop currently tracks interrupts generated by uhci, ehci, and ohci,
but it has no way of telling which USB device to blame USB bus activity on.
This patch exports the number of URBs that are submitted for a given device.
Cat the file 'urbnum' in /sys/bus/usb/devices/.../
Signed-off-by: Sarah Sharp <sarah.a.sharp@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/sysfs.c')
| -rw-r--r-- | drivers/usb/core/sysfs.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c index e025902..b04afd0 100644 --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -169,6 +169,16 @@ show_quirks(struct device *dev, struct device_attribute *attr, char *buf) } static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL); +static ssize_t +show_urbnum(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct usb_device *udev; + + udev = to_usb_device(dev); + return sprintf(buf, "%d\n", atomic_read(&udev->urbnum)); +} +static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL); + #if defined(CONFIG_USB_PERSIST) || defined(CONFIG_USB_SUSPEND) static const char power_group[] = "power"; @@ -458,6 +468,7 @@ static struct attribute *dev_attrs[] = { &dev_attr_bConfigurationValue.attr, &dev_attr_bmAttributes.attr, &dev_attr_bMaxPower.attr, + &dev_attr_urbnum.attr, /* device attributes */ &dev_attr_idVendor.attr, &dev_attr_idProduct.attr, |