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Commit 89a11065 authored by Vivek Golani's avatar Vivek Golani
Browse files

soc: qcom: Enable remote notification for local close 



Adding support for some user space clients that want
a notification to be sent to remote subsystem when a
local close call is made.

Change-Id: I5641ad649ad30b995093e11187f0a80a09ea39e7
Signed-off-by: default avatarVivek Golani <vgolani@codeaurora.org>
parent 47f285b8

drivers/soc/qcom/glink_pkt.c

+24 −5
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2014-2020, The Linux Foundation. All rights reserved.

 * Copyright (c) 2014-2021, The Linux Foundation. All rights reserved.

 */



#include <linux/platform_device.h>
@@ -77,7 +77,8 @@ struct glink_pkt_device { 
	struct sk_buff_head queue;

	wait_queue_head_t readq;

	int sig_change;



	bool enable_ch_close;

	int drv_registered;

	const char *dev_name;

	const char *ch_name;

	const char *edge;
@@ -222,8 +223,17 @@ static int glink_pkt_open(struct inode *inode, struct file *file) 
		       gpdev->ch_name, current->comm,

		       task_pid_nr(current), refcount_read(&gpdev->refcount));



	if (!gpdev->drv_registered && gpdev->enable_ch_close) {

		register_rpmsg_driver(&gpdev->drv);

		gpdev->drv_registered = 1;

	}



	ret = wait_for_completion_interruptible_timeout(&gpdev->ch_open, tout);

	if (ret <= 0) {

		if (gpdev->drv_registered && gpdev->enable_ch_close) {

			unregister_rpmsg_driver(&gpdev->drv);

			gpdev->drv_registered = 0;

		}

		refcount_dec(&gpdev->refcount);

		put_device(dev);

		GLINK_PKT_INFO("timeout for %s by %s:%d\n", gpdev->ch_name,
@@ -273,6 +283,10 @@ static int glink_pkt_release(struct inode *inode, struct file *file) 
		spin_unlock_irqrestore(&gpdev->queue_lock, flags);

	}



	if (gpdev->drv_registered && gpdev->enable_ch_close) {

		unregister_rpmsg_driver(&gpdev->drv);

		gpdev->drv_registered = 0;

	}

	put_device(dev);



	return 0;
@@ -607,8 +621,11 @@ static int glink_pkt_parse_devicetree(struct device_node *np, 
	if (ret < 0)

		goto error;



	GLINK_PKT_INFO("Parsed %s:%s /dev/%s\n", gpdev->edge, gpdev->ch_name,

		       gpdev->dev_name);

	key = "qcom,glinkpkt-enable-ch-close";

	gpdev->enable_ch_close = of_property_read_bool(np, key);



	GLINK_PKT_INFO("Parsed %s:%s /dev/%s enable channel close:%d\n", gpdev->edge,

			gpdev->ch_name, gpdev->dev_name, gpdev->enable_ch_close);

	return 0;



error:
@@ -734,8 +751,10 @@ static int glink_pkt_create_device(struct device *parent, 
		GLINK_PKT_ERR("device_create_file failed for %s\n",

			      gpdev->dev_name);



	if (glink_pkt_init_rpmsg(gpdev))

	if (glink_pkt_init_rpmsg(gpdev)) {

		gpdev->drv_registered = 1;

		goto free_dev;

	}



	return 0;