diff options
Diffstat (limited to 'drivers/usb/core/sysfs.c')
| -rw-r--r-- | drivers/usb/core/sysfs.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c index cad4fb323f6..311d5df8038 100644 --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -158,6 +158,65 @@ show_quirks(struct device *dev, struct device_attribute *attr, char *buf) } static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL); +#ifdef CONFIG_USB_SUSPEND + +static ssize_t +show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct usb_device *udev = to_usb_device(dev); + + return sprintf(buf, "%u\n", udev->autosuspend_delay / HZ); +} + +static ssize_t +set_autosuspend(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct usb_device *udev = to_usb_device(dev); + unsigned value, old; + + if (sscanf(buf, "%u", &value) != 1 || value >= INT_MAX/HZ) + return -EINVAL; + value *= HZ; + + old = udev->autosuspend_delay; + udev->autosuspend_delay = value; + if (value > 0 && old == 0) + usb_try_autosuspend_device(udev); + + return count; +} + +static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR, + show_autosuspend, set_autosuspend); + +static char power_group[] = "power"; + +static int add_power_attributes(struct device *dev) +{ + int rc = 0; + + if (is_usb_device(dev)) + rc = sysfs_add_file_to_group(&dev->kobj, + &dev_attr_autosuspend.attr, + power_group); + return rc; +} + +static void remove_power_attributes(struct device *dev) +{ + sysfs_remove_file_from_group(&dev->kobj, + &dev_attr_autosuspend.attr, + power_group); +} + +#else + +#define add_power_attributes(dev) 0 +#define remove_power_attributes(dev) do {} while (0) + +#endif /* CONFIG_USB_SUSPEND */ + /* Descriptor fields */ #define usb_descriptor_attr_le16(field, format_string) \ static ssize_t \ @@ -230,6 +289,10 @@ int usb_create_sysfs_dev_files(struct usb_device *udev) if (retval) return retval; + retval = add_power_attributes(dev); + if (retval) + goto error; + if (udev->manufacturer) { retval = device_create_file(dev, &dev_attr_manufacturer); if (retval) @@ -262,6 +325,7 @@ void usb_remove_sysfs_dev_files(struct usb_device *udev) device_remove_file(dev, &dev_attr_manufacturer); device_remove_file(dev, &dev_attr_product); device_remove_file(dev, &dev_attr_serial); + remove_power_attributes(dev); sysfs_remove_group(&dev->kobj, &dev_attr_grp); } |