wusbcore: add sysfs attribute for retry count

[karo-tx-linux.git] / drivers / usb / wusbcore / wusbhc.c

diff --git a/drivers/usb/wusbcore/wusbhc.c b/drivers/usb/wusbcore/wusbhc.c
index 8759aa66da2827975f529d068d48370ec5258173..e712af3e46c28dd9b9bc31dcd44017797a5bd514 100644 (file)
--- a/drivers/usb/wusbcore/wusbhc.c
+++ b/drivers/usb/wusbcore/wusbhc.c
@@ -205,12 +205,42 @@ static ssize_t wusb_dnts_store(struct device *dev,
 }
 static DEVICE_ATTR(wusb_dnts, 0644, wusb_dnts_show, wusb_dnts_store);
 
+static ssize_t wusb_retry_count_show(struct device *dev,
+                                 struct device_attribute *attr,
+                                 char *buf)
+{
+       struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+
+       return sprintf(buf, "%d\n", wusbhc->retry_count);
+}
+
+static ssize_t wusb_retry_count_store(struct device *dev,
+                                  struct device_attribute *attr,
+                                  const char *buf, size_t size)
+{
+       struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+       uint8_t retry_count;
+       ssize_t result;
+
+       result = sscanf(buf, "%hhu", &retry_count);
+
+       if (result != 1)
+               return -EINVAL;
+
+       wusbhc->retry_count = max_t(uint8_t, retry_count, WUSB_RETRY_COUNT_MAX);
+
+       return size;
+}
+static DEVICE_ATTR(wusb_retry_count, 0644, wusb_retry_count_show,
+       wusb_retry_count_store);
+
 /* Group all the WUSBHC attributes */
 static struct attribute *wusbhc_attrs[] = {
                &dev_attr_wusb_trust_timeout.attr,
                &dev_attr_wusb_chid.attr,
                &dev_attr_wusb_phy_rate.attr,
                &dev_attr_wusb_dnts.attr,
+               &dev_attr_wusb_retry_count.attr,
                NULL,
 };
 
@@ -241,6 +271,7 @@ int wusbhc_create(struct wusbhc *wusbhc)
        wusbhc->phy_rate = UWB_PHY_RATE_INVALID - 1;
        wusbhc->dnts_num_slots = 4;
        wusbhc->dnts_interval = 2;
+       wusbhc->retry_count = WUSB_RETRY_COUNT_INFINITE;
 
        mutex_init(&wusbhc->mutex);
        result = wusbhc_mmcie_create(wusbhc);