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

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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>
This commit is contained in:
Simon Arlott 2007-03-06 02:47:43 -08:00 committed by Greg Kroah-Hartman
parent c2cf3f6ec5
commit e9b8daf31b
1 changed files with 13 additions and 1 deletions
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14
drivers/usb/atm/usbatm.c
View file

@ -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 */
}