linux-kernel - [PATCH 4.3 097/125] usb: chipidea: otg: gadget module load and unload support

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Date:	Mon,  7 Dec 2015 10:01:50 -0500
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Li Jun <jun.li@...escale.com>,
	Peter Chen <peter.chen@...escale.com>,
	Jiada Wang <jiada_wang@...tor.com>
Subject: [PATCH 4.3 097/125] usb: chipidea: otg: gadget module load and unload support

4.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Li Jun <B47624@...escale.com>

commit 85da852df66e5e0d3aba761b0fece7c958ff0685 upstream.

This patch is to support load and unload gadget driver in full OTG mode.

Signed-off-by: Li Jun <jun.li@...escale.com>
Signed-off-by: Peter Chen <peter.chen@...escale.com>
Tested-by: Jiada Wang <jiada_wang@...tor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/chipidea/udc.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1751,6 +1751,22 @@ static int ci_udc_start(struct usb_gadge
 	return retval;
 }
 
+static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
+{
+	if (!ci_otg_is_fsm_mode(ci))
+		return;
+
+	mutex_lock(&ci->fsm.lock);
+	if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
+		ci->fsm.a_bidl_adis_tmout = 1;
+		ci_hdrc_otg_fsm_start(ci);
+	} else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
+		ci->fsm.protocol = PROTO_UNDEF;
+		ci->fsm.otg->state = OTG_STATE_UNDEFINED;
+	}
+	mutex_unlock(&ci->fsm.lock);
+}
+
 /**
  * ci_udc_stop: unregister a gadget driver
  */
@@ -1775,6 +1791,7 @@ static int ci_udc_stop(struct usb_gadget
 	ci->driver = NULL;
 	spin_unlock_irqrestore(&ci->lock, flags);
 
+	ci_udc_stop_for_otg_fsm(ci);
 	return 0;
 }
 


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