[PATCH 1/1] usb: gadget: zero: Add flexible auto remote wakeup test method

[Peter Chen <peter.chen@xxxxxxxxxxxxx>]

In order to increase test coverage, we can change the interval between
two remote wakeups every time, and the interval can be any user defined
value. This change will no affect current behavior if the user does not
use two introduced module paramters.

Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
---
 drivers/usb/gadget/zero.c |   26 +++++++++++++++++++++++---
 1 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/zero.c b/drivers/usb/gadget/zero.c
index 0deb9d6..076f2be 100644
--- a/drivers/usb/gadget/zero.c
+++ b/drivers/usb/gadget/zero.c
@@ -38,7 +38,6 @@
  */
 
 /* #define VERBOSE_DEBUG */
-
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/device.h>
@@ -95,6 +94,18 @@ unsigned autoresume = DEFAULT_AUTORESUME;
 module_param(autoresume, uint, S_IRUGO);
 MODULE_PARM_DESC(autoresume, "zero, or seconds before remote wakeup");
 
+/* Maximum Autoresume time */
+unsigned max_autoresume;
+module_param(max_autoresume, uint, S_IRUGO);
+MODULE_PARM_DESC(max_autoresume, "maximum seconds before remote wakeup");
+
+/* Internal between two remote wakeups */
+unsigned autoresume_interal_ms;
+module_param(autoresume_interal_ms, uint, S_IRUGO);
+MODULE_PARM_DESC(autoresume_interal_ms,
+		"milliseconds internal between sending two wakeups");
+
+static unsigned autoresume_step_ms;
 /*-------------------------------------------------------------------------*/
 
 static struct usb_device_descriptor device_desc = {
@@ -183,8 +194,16 @@ static void zero_suspend(struct usb_composite_dev *cdev)
 		return;
 
 	if (autoresume) {
-		mod_timer(&autoresume_timer, jiffies + (HZ * autoresume));
-		DBG(cdev, "suspend, wakeup in %d seconds\n", autoresume);
+		if (max_autoresume &&
+			(autoresume_step_ms > max_autoresume * 1000))
+				autoresume_step_ms = autoresume * 1000;
+
+		mod_timer(&autoresume_timer, jiffies +
+			msecs_to_jiffies(autoresume_step_ms));
+		DBG(cdev, "suspend, wakeup in %d milliseconds\n",
+			autoresume_step_ms);
+
+		autoresume_step_ms += autoresume_interal_ms;
 	} else
 		DBG(cdev, "%s\n", __func__);
 }
@@ -316,6 +335,7 @@ static int __init zero_bind(struct usb_composite_dev *cdev)
 	if (autoresume) {
 		sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 		loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+		autoresume_step_ms = autoresume * 1000;
 	}
 
 	/* support OTG systems */
-- 
1.7.1


--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html