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| author | Inaky Perez-Gonzalez <inaky@linux.intel.com> | 2007-07-31 20:34:07 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-10-12 14:55:08 -0700 |
| commit | e03f2e8a530e0ed46af43093e23a70b7c7215263 (patch) | |
| tree | 69bc76da836e9953ab78c3aae22dac89fe7a21f8 /drivers/usb/core/sysfs.c | |
| parent | 93993a0a3e528357ae4b9b0eb82fd4b428ebbf64 (diff) | |
| download | linux-e03f2e8a530e0ed46af43093e23a70b7c7215263.tar.bz2 | |
usb: hook up device authorization to sysfs
Makes it possible to control the authorization of USB devices through
sysfs's /sys/usb/devices/*/authorize.
Update: per Adrian Bunk's suggestion, make dev_attr_authorized_default static
Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.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 | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c index 2ab222be8fd1..e02590297d31 100644 --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -413,6 +413,44 @@ usb_descriptor_attr(bDeviceProtocol, "%02x\n") usb_descriptor_attr(bNumConfigurations, "%d\n") usb_descriptor_attr(bMaxPacketSize0, "%d\n") + + +/* show if the device is authorized (1) or not (0) */ +static ssize_t usb_dev_authorized_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct usb_device *usb_dev = to_usb_device(dev); + return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized); +} + + +/* + * Authorize a device to be used in the system + * + * Writing a 0 deauthorizes the device, writing a 1 authorizes it. + */ +static ssize_t usb_dev_authorized_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + ssize_t result; + struct usb_device *usb_dev = to_usb_device(dev); + unsigned val; + result = sscanf(buf, "%u\n", &val); + if (result != 1) + result = -EINVAL; + else if (val == 0) + result = usb_deauthorize_device(usb_dev); + else + result = usb_authorize_device(usb_dev); + return result < 0? result : size; +} + +static DEVICE_ATTR(authorized, 0644, + usb_dev_authorized_show, usb_dev_authorized_store); + + static struct attribute *dev_attrs[] = { /* current configuration's attributes */ &dev_attr_configuration.attr, @@ -435,6 +473,7 @@ static struct attribute *dev_attrs[] = { &dev_attr_version.attr, &dev_attr_maxchild.attr, &dev_attr_quirks.attr, + &dev_attr_authorized.attr, NULL, }; static struct attribute_group dev_attr_grp = { |