usb/usbatm-create-sysfs-link-device-from-atm-class-device-to-usb-interface.patch

From akpm@linux-foundation.org Tue Mar  6 02:48:14 2007
From: Simon Arlott <simon@arlott.org>
Date: Tue, 06 Mar 2007 02:47:43 -0800
Subject: usbatm: create sysfs link "device" from atm class device to usb interface
To: greg@kroah.com
Cc: linux-usb-devel@lists.sourceforge.net, akpm@linux-foundation.org, simon@arlott.org, duncan.sands@math.u-psud.fr, simon@fire.lp0.eu
Message-ID: <200703061047.l26AlhC3020180@shell0.pdx.osdl.net>


From: Simon Arlott <simon@arlott.org>

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>

---
 drivers/usb/atm/usbatm.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

--- a/drivers/usb/atm/usbatm.c
+++ b/drivers/usb/atm/usbatm.c
@@ -966,6 +966,14 @@ static int usbatm_atm_init(struct usbatm
 	/* 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;
@@ -984,6 +992,8 @@ static int usbatm_atm_init(struct usbatm
 	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;
@@ -1316,8 +1326,10 @@ void usbatm_usb_disconnect(struct usb_in
 	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 */
 }