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authorSimon Arlott <simon@arlott.org>2007-03-06 02:47:43 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2007-04-27 13:28:34 -0700
commite9b8daf31b459acb440647a651b1bda3b30e6188 (patch)
tree6ac500a77eb7bd2b2915566d982b5b40c24ff47b /drivers/usb/atm/usbatm.c
parentc2cf3f6ec58cf1d9e2a92cd74506dcf2265b31a1 (diff)
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>
Diffstat (limited to 'drivers/usb/atm/usbatm.c')
-rw-r--r--drivers/usb/atm/usbatm.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/usb/atm/usbatm.c b/drivers/usb/atm/usbatm.c
index d3e2c5f90a2..746d30ffb73 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 */
}