Merge "usb: gadget: f_ipc: Add support of sideband notifier call chain" (e8f94a76) · Commits · e / devices / android_kernel_xiaomi_nabu

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;