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>
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1 changed files with 13 additions and 1 deletions
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@ -968,6 +968,14 @@ static int usbatm_atm_init(struct usbatm_data *instance)
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/* temp init ATM device, set to 128kbit */
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atm_dev->link_rate = 128 * 1000 / 424;
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ret = sysfs_create_link(&atm_dev->class_dev.kobj,
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&instance->usb_intf->dev.kobj, "device");
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if (ret) {
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atm_err(instance, "%s: sysfs_create_link failed: %d\n",
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__func__, ret);
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goto fail_sysfs;
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}
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if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
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atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
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goto fail;
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@ -986,6 +994,8 @@ static int usbatm_atm_init(struct usbatm_data *instance)
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return 0;
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fail:
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sysfs_remove_link(&atm_dev->class_dev.kobj, "device");
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fail_sysfs:
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instance->atm_dev = NULL;
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atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
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return ret;
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@ -1318,8 +1328,10 @@ void usbatm_usb_disconnect(struct usb_interface *intf)
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kfree(instance->cell_buf);
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/* ATM finalize */
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if (instance->atm_dev)
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if (instance->atm_dev) {
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sysfs_remove_link(&instance->atm_dev->class_dev.kobj, "device");
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atm_dev_deregister(instance->atm_dev);
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}
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usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
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}
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