USB: wusb: add wusb_phy_rate sysfs file to host controllers

Add the wusb_phy_rate sysfs file to Wireless USB host controllers.  This
sets the maximum PHY rate that will be used for all connected devices.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 33 insertions, 0 deletions

diff --git a/drivers/usb/wusbcore/wusbhc.c b/drivers/usb/wusbcore/wusbhc.c
index ee6256f23636..eab86e4bc770 100644
--- a/drivers/usb/wusbcore/wusbhc.c
+++ b/drivers/usb/wusbcore/wusbhc.c
@@ -147,10 +147,40 @@ static ssize_t wusb_chid_store(struct device *dev,
 }
 static DEVICE_ATTR(wusb_chid, 0644, wusb_chid_show, wusb_chid_store);
 
+
+static ssize_t wusb_phy_rate_show(struct device *dev,
+                                  struct device_attribute *attr,
+                                  char *buf)
+{
+        struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+
+        return sprintf(buf, "%d\n", wusbhc->phy_rate);
+}
+
+static ssize_t wusb_phy_rate_store(struct device *dev,
+                                   struct device_attribute *attr,
+                                   const char *buf, size_t size)
+{
+        struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+        uint8_t phy_rate;
+        ssize_t result;
+
+        result = sscanf(buf, "%hhu", &phy_rate);
+        if (result != 1)
+                return -EINVAL;
+        if (phy_rate >= UWB_PHY_RATE_INVALID)
+                return -EINVAL;
+
+        wusbhc->phy_rate = phy_rate;
+        return size;
+}
+static DEVICE_ATTR(wusb_phy_rate, 0644, wusb_phy_rate_show, wusb_phy_rate_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,
                 NULL,
 };
 
@@ -177,6 +207,8 @@ int wusbhc_create(struct wusbhc *wusbhc)
         int result = 0;
 
         wusbhc->trust_timeout = WUSB_TRUST_TIMEOUT_MS;
+        wusbhc->phy_rate = UWB_PHY_RATE_INVALID - 1;
+
         mutex_init(&wusbhc->mutex);
         result = wusbhc_mmcie_create(wusbhc);
         if (result < 0)
diff --git a/drivers/usb/wusbcore/wusbhc.h b/drivers/usb/wusbcore/wusbhc.h
index 797c2453a35b..fd2fd4e277e1 100644
--- a/drivers/usb/wusbcore/wusbhc.h
+++ b/drivers/usb/wusbcore/wusbhc.h
@@ -253,6 +253,7 @@ struct wusbhc {
 
         unsigned trust_timeout;                 /* in jiffies */
         struct wusb_ckhdid chid;
+        uint8_t phy_rate;
         struct wuie_host_info *wuie_host_info;
 
         struct mutex mutex;                     /* locks everything else */