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path: root/drivers/usb/gadget/zero.c
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Diffstat (limited to 'drivers/usb/gadget/zero.c')
-rw-r--r--drivers/usb/gadget/zero.c27
1 files changed, 24 insertions, 3 deletions
diff --git a/drivers/usb/gadget/zero.c b/drivers/usb/gadget/zero.c
index 0deb9d6cde26..f49b0b61ecc8 100644
--- a/drivers/usb/gadget/zero.c
+++ b/drivers/usb/gadget/zero.c
@@ -91,10 +91,22 @@ static struct usb_zero_options gzero_options = {
* functional coverage for the "USBCV" test harness from USB-IF.
* It's always set if OTG mode is enabled.
*/
-unsigned autoresume = DEFAULT_AUTORESUME;
+static unsigned autoresume = DEFAULT_AUTORESUME;
module_param(autoresume, uint, S_IRUGO);
MODULE_PARM_DESC(autoresume, "zero, or seconds before remote wakeup");
+/* Maximum Autoresume time */
+static unsigned max_autoresume;
+module_param(max_autoresume, uint, S_IRUGO);
+MODULE_PARM_DESC(max_autoresume, "maximum seconds before remote wakeup");
+
+/* Interval between two remote wakeups */
+static unsigned autoresume_interval_ms;
+module_param(autoresume_interval_ms, uint, S_IRUGO);
+MODULE_PARM_DESC(autoresume_interval_ms,
+ "milliseconds to increase successive wakeup delays");
+
+static unsigned autoresume_step_ms;
/*-------------------------------------------------------------------------*/
static struct usb_device_descriptor device_desc = {
@@ -183,8 +195,16 @@ 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_interval_ms;
} else
DBG(cdev, "%s\n", __func__);
}
@@ -316,6 +336,7 @@ 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 */