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| author | Alan Stern <stern@rowland.harvard.edu> | 2010-04-02 13:22:16 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-20 13:21:37 -0700 |
| commit | a90309860b0935805d49e75499fb8dc59fea8e94 (patch) | |
| tree | 2d5ed0376a0f0ead945afdaa11be00a48bc0af6c /drivers | |
| parent | 9e18c821659d836bd63f88df3c19729327728496 (diff) | |
| download | linux-3.10-a90309860b0935805d49e75499fb8dc59fea8e94.tar.gz linux-3.10-a90309860b0935805d49e75499fb8dc59fea8e94.tar.bz2 linux-3.10-a90309860b0935805d49e75499fb8dc59fea8e94.zip | |
USB: deprecate the power/level sysfs attribute
This patch (as1367) deprecates USB's power/level sysfs attribute in
favor of the power/control attribute provided by the runtime PM core.
The two attributes do the same thing.
It would be nice to replace power/level with a symlink to
power/control, but at the moment sysfs doesn't offer any way to do so.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/core/sysfs.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c index b65c1eaf3ab..06863befaf3 100644 --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -383,12 +383,23 @@ static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR, static const char on_string[] = "on"; static const char auto_string[] = "auto"; +static void warn_level(void) { + static int level_warned; + + if (!level_warned) { + level_warned = 1; + printk(KERN_WARNING "WARNING! power/level is deprecated; " + "use power/control instead\n"); + } +} + static ssize_t show_level(struct device *dev, struct device_attribute *attr, char *buf) { struct usb_device *udev = to_usb_device(dev); const char *p = auto_string; + warn_level(); if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto) p = on_string; return sprintf(buf, "%s\n", p); @@ -403,6 +414,7 @@ set_level(struct device *dev, struct device_attribute *attr, char *cp; int rc = count; + warn_level(); cp = memchr(buf, '\n', count); if (cp) len = cp - buf; |