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Commit ab5cf70b authored by Aniket Randive's avatar Aniket Randive Committed by Gerrit - the friendly Code Review server
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usb: gadget: f_ipc: Add support of sideband notifier call chain 



Due to host is in suspend mode the write operation on usb endpoint
is fail so register sideband signal to notify the GPIO driver with
"EVT_WAKE_UP" event, so GPIO driver will wakeup the host as per
event. due to the sideband signalling mechanism, peripheral is able
to send important message after host is coming out from suspend.

Change-Id: I1196f265464ab13e55c1a69fbeb22a1d85d19dcb
Signed-off-by: default avatarAniket Randive <arandive@codeaurora.org>
parent 6b42a54e

drivers/usb/gadget/function/f_ipc.c

+14 −1
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#include <linux/workqueue.h>

#include <linux/debugfs.h>

#include <linux/usb/ipc_bridge.h>

#include <soc/qcom/sb_notification.h>



#define MAX_INST_NAME_LEN	40
@@ -272,22 +273,34 @@ static int ipc_write(struct platform_device *pdev, char *buf, 
	reinit_completion(&ipc_dev->write_done);



	if (usb_ep_queue(in, req, GFP_KERNEL)) {

		/* Notify GPIO driver to wakup the host if host

		 * is in suspend mode.

		 */

		sb_notifier_call_chain(EVT_WAKE_UP, NULL);

		wait_event_interruptible(ipc_dev->state_wq, ipc_dev->online ||

				ipc_dev->current_state == IPC_DISCONNECTED);

		pr_debug("%s: Interface ready, Retry IN request\n", __func__);

		goto retry_write;

	}



retry_write_done:

	ret = wait_for_completion_interruptible_timeout(&ipc_dev->write_done,

				msecs_to_jiffies(IPC_WRITE_WAIT_TIMEOUT));

	if (ret < 0) {

		pr_err("%s: Interruption triggered\n", __func__);

		ret = -EINTR;

		goto fail;

	} else if (ret == 0) {

	} else if (ret == 0 && ipc_dev->online) {

		pr_err("%s: Request timed out\n", __func__);

		ret = -ETIMEDOUT;

		goto fail;

	/* Notify the GPIO driver to wakeup the host and reintialize the

	 * completion structure.

	 */

	} else if (!ipc_dev->online) {

		sb_notifier_call_chain(EVT_WAKE_UP, NULL);

		reinit_completion(&ipc_dev->write_done);

		goto retry_write_done;

	}



	return !req->status ? req->actual : req->status;