From c1045e87b2cd293d53dff19779ea46b19195d593 Mon Sep 17 00:00:00 2001 From: Andiry Xu Date: Fri, 23 Sep 2011 14:19:53 -0700 Subject: usbcore: add sysfs support to xHCI usb2 hardware LPM This patch adds sysfs support to xHCI usb2 hardware LPM, so developer can enable and disable usb2 hardware LPM manually for test purpose. Signed-off-by: Andiry Xu Signed-off-by: Sarah Sharp Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/sysfs.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 58 insertions(+), 1 deletion(-) (limited to 'drivers/usb/core/sysfs.c') diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c index cf05b97..662c0cf 100644 --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -412,6 +412,56 @@ set_level(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level); +static ssize_t +show_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct usb_device *udev = to_usb_device(dev); + const char *p; + + if (udev->usb2_hw_lpm_enabled == 1) + p = "enabled"; + else + p = "disabled"; + + return sprintf(buf, "%s\n", p); +} + +static ssize_t +set_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct usb_device *udev = to_usb_device(dev); + bool value; + int ret; + + usb_lock_device(udev); + + ret = strtobool(buf, &value); + + if (!ret) + ret = usb_set_usb2_hardware_lpm(udev, value); + + usb_unlock_device(udev); + + if (!ret) + return count; + + return ret; +} + +static DEVICE_ATTR(usb2_hardware_lpm, S_IRUGO | S_IWUSR, show_usb2_hardware_lpm, + set_usb2_hardware_lpm); + +static struct attribute *usb2_hardware_lpm_attr[] = { + &dev_attr_usb2_hardware_lpm.attr, + NULL, +}; +static struct attribute_group usb2_hardware_lpm_attr_group = { + .name = power_group_name, + .attrs = usb2_hardware_lpm_attr, +}; + static struct attribute *power_attrs[] = { &dev_attr_autosuspend.attr, &dev_attr_level.attr, @@ -428,13 +478,20 @@ static int add_power_attributes(struct device *dev) { int rc = 0; - if (is_usb_device(dev)) + if (is_usb_device(dev)) { + struct usb_device *udev = to_usb_device(dev); rc = sysfs_merge_group(&dev->kobj, &power_attr_group); + if (udev->usb2_hw_lpm_capable == 1) + rc = sysfs_merge_group(&dev->kobj, + &usb2_hardware_lpm_attr_group); + } + return rc; } static void remove_power_attributes(struct device *dev) { + sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group); sysfs_unmerge_group(&dev->kobj, &power_attr_group); } -- cgit v1.1