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soc: qcom: Enable remote notification for local close

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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: Vivek Golani <vgolani@codeaurora.org>
This commit is contained in:
Vivek Golani 2021-02-08 14:44:39 +05:30
parent 47f285b88f
commit 89a11065bc
1 changed files with 24 additions and 5 deletions
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29
drivers/soc/qcom/glink_pkt.c
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@ -1,6 +1,6 @@
// 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;