usbatm: create sysfs link "device" from atm class device to usb interface

There is currently no path from the ATM device in /sys to the USB device's
interface that the driver is using; this patch creates a "device" symlink.  It
is then possible to get to the cxacru ADSL statistics
(http://lkml.org/lkml/2007/2/23/328):

/sys/class/atm/cxacru0/device $ ls *_rate *_margin *_attenuation
downstream_attenuation  downstream_snr_margin  upstream_rate
downstream_rate         upstream_attenuation   upstream_snr_margin

If this link is not appropriate I'd have to create device files in
/sys/class/atm/cxacru0 instead - which seems less appropriate since the ADSL
statistics are for the USB device not ATM (which is running over the ADSL).

[akpm@linux-foundation.org: cleanups]
Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Cc: Duncan Sands <duncan.sands@math.u-psud.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/usb/atm/usbatm.c b/drivers/usb/atm/usbatm.c
index d3e2c5f90a26..746d30ffb732 100644
--- a/drivers/usb/atm/usbatm.c
+++ b/drivers/usb/atm/usbatm.c
@@ -968,6 +968,14 @@ static int usbatm_atm_init(struct usbatm_data *instance)
         /* temp init ATM device, set to 128kbit */
         atm_dev->link_rate = 128 * 1000 / 424;
 
+        ret = sysfs_create_link(&atm_dev->class_dev.kobj,
+                                &instance->usb_intf->dev.kobj, "device");
+        if (ret) {
+                atm_err(instance, "%s: sysfs_create_link failed: %d\n",
+                                        __func__, ret);
+                goto fail_sysfs;
+        }
+
         if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
                 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
                 goto fail;
@@ -986,6 +994,8 @@ static int usbatm_atm_init(struct usbatm_data *instance)
         return 0;
 
  fail:
+        sysfs_remove_link(&atm_dev->class_dev.kobj, "device");
+ fail_sysfs:
         instance->atm_dev = NULL;
         atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
         return ret;
@@ -1318,8 +1328,10 @@ void usbatm_usb_disconnect(struct usb_interface *intf)
         kfree(instance->cell_buf);
 
         /* ATM finalize */
-        if (instance->atm_dev)
+        if (instance->atm_dev) {
+                sysfs_remove_link(&instance->atm_dev->class_dev.kobj, "device");
                 atm_dev_deregister(instance->atm_dev);
+        }
 
         usbatm_put_instance(instance);  /* taken in usbatm_usb_probe */
 }