WUSB: correct format of wusb_chid sysfs file
Make the wusb_chid sysfs file match the ABI documentation.
Print all zeros if the WUSB host is stopped (instead of an empty file)
and end the file with a newline.
Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/wusbcore/wusbhc.c b/drivers/usb/wusbcore/wusbhc.c
index 3638cc6..ee6256f 100644
--- a/drivers/usb/wusbcore/wusbhc.c
+++ b/drivers/usb/wusbcore/wusbhc.c
@@ -88,33 +88,31 @@
wusb_trust_timeout_store);
/*
- * Show & store the current WUSB CHID
+ * Show the current WUSB CHID.
*/
static ssize_t wusb_chid_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+ const struct wusb_ckhdid *chid;
ssize_t result = 0;
if (wusbhc->wuie_host_info != NULL)
- result += ckhdid_printf(buf, PAGE_SIZE,
- &wusbhc->wuie_host_info->CHID);
+ chid = &wusbhc->wuie_host_info->CHID;
+ else
+ chid = &wusb_ckhdid_zero;
+
+ result += ckhdid_printf(buf, PAGE_SIZE, chid);
+ result += sprintf(buf + result, "\n");
+
return result;
}
/*
- * Store a new CHID
+ * Store a new CHID.
*
- * This will (FIXME) trigger many changes.
- *
- * - Send an all zeros CHID and it will stop the controller
- * - Send a non-zero CHID and it will start it
- * (unless it was started, it will just change the CHID,
- * diconnecting all devices first).
- *
- * So first we scan the MMC we are sent and then we act on it. We
- * read it in the same format as we print it, an ASCII string of 16
- * hex bytes.
+ * - Write an all zeros CHID and it will stop the controller
+ * - Write a non-zero CHID and it will start it.
*
* See wusbhc_chid_set() for more info.
*/