]> asedeno.scripts.mit.edu Git - linux.git/commitdiff
usb: gadget: configfs: Add max_speed setting
authorThinh Nguyen <Thinh.Nguyen@synopsys.com>
Thu, 9 Jan 2020 02:38:10 +0000 (18:38 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 15 Jan 2020 09:39:21 +0000 (10:39 +0100)
Some functions support speeds other than SuperSpeed. Add max_speed
attribute to configfs gadget allowing user to specify the maximum speed
the composite driver supports. The valid input speed names are
super-speed-plus, super-speed, high-speed, full-speed, and low-speed.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Documentation/ABI/testing/configfs-usb-gadget
drivers/usb/gadget/configfs.c

index 95a36589a66b564fc358c52056075c18888eca4a..4594cc2435e8cab6a8f3040343cf86d6ed2a232b 100644 (file)
@@ -16,6 +16,10 @@ Description:
                                write UDC's name found in /sys/class/udc/*
                                to bind a gadget, empty string "" to unbind.
 
+               max_speed       - maximum speed the driver supports. Valid
+                               names are super-speed-plus, super-speed,
+                               high-speed, full-speed, and low-speed.
+
                bDeviceClass    - USB device class code
                bDeviceSubClass - USB device subclass code
                bDeviceProtocol - USB device protocol code
index ab9ac48a751a78d4a69fb340ce6df919f8cbed3d..32b637e3e1fa2b5bdccb0ba9f001a96246f751f5 100644 (file)
@@ -293,6 +293,47 @@ static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
        return ret;
 }
 
+static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
+                                             char *page)
+{
+       enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
+
+       return sprintf(page, "%s\n", usb_speed_string(speed));
+}
+
+static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
+                                              const char *page, size_t len)
+{
+       struct gadget_info *gi = to_gadget_info(item);
+
+       mutex_lock(&gi->lock);
+
+       /* Prevent changing of max_speed after the driver is binded */
+       if (gi->composite.gadget_driver.udc_name)
+               goto err;
+
+       if (strncmp(page, "super-speed-plus", 16) == 0)
+               gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
+       else if (strncmp(page, "super-speed", 11) == 0)
+               gi->composite.max_speed = USB_SPEED_SUPER;
+       else if (strncmp(page, "high-speed", 10) == 0)
+               gi->composite.max_speed = USB_SPEED_HIGH;
+       else if (strncmp(page, "full-speed", 10) == 0)
+               gi->composite.max_speed = USB_SPEED_FULL;
+       else if (strncmp(page, "low-speed", 9) == 0)
+               gi->composite.max_speed = USB_SPEED_LOW;
+       else
+               goto err;
+
+       gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
+
+       mutex_unlock(&gi->lock);
+       return len;
+err:
+       mutex_unlock(&gi->lock);
+       return -EINVAL;
+}
+
 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
@@ -302,6 +343,7 @@ CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
+CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
 
 static struct configfs_attribute *gadget_root_attrs[] = {
        &gadget_dev_desc_attr_bDeviceClass,
@@ -313,6 +355,7 @@ static struct configfs_attribute *gadget_root_attrs[] = {
        &gadget_dev_desc_attr_bcdDevice,
        &gadget_dev_desc_attr_bcdUSB,
        &gadget_dev_desc_attr_UDC,
+       &gadget_dev_desc_attr_max_speed,
        NULL,
 };