From patchwork Thu Sep 30 15:32:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak Kumar Singh X-Patchwork-Id: 12528721 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85A13C433F5 for ; Thu, 30 Sep 2021 15:32:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6EE67619F7 for ; Thu, 30 Sep 2021 15:32:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344527AbhI3Peg (ORCPT ); Thu, 30 Sep 2021 11:34:36 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:60279 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344459AbhI3Ped (ORCPT ); Thu, 30 Sep 2021 11:34:33 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1633015971; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=R/mHK1i/fnTfkiq3fb7H0zHVfvOwMlnRIUyhhoj5zNo=; b=PAhZrpbBZk5jzGDq2XXTM4XdsQdDrtxpN08oliDLSca8k6+GLr/fXjhu8NFjO/NNkbcIMOVK NaACMnmcgLffv2+2NN2U3BjBrN5uxyhravYeShtAUY5EV3getTT57GB+HxiJrezeCkbYcOqe rpIyvZmdlgYQIR3/6hK2MKgPAd0= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI4ZWZiZiIsICJsaW51eC1yZW1vdGVwcm9jQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n04.prod.us-west-2.postgun.com with SMTP id 6155d89a47d64efb6d66241e (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Thu, 30 Sep 2021 15:32:42 GMT Sender: deesin=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 6EEC0C4361A; Thu, 30 Sep 2021 15:32:42 +0000 (UTC) Received: from deesin-linux.qualcomm.com (unknown [202.46.22.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: deesin) by smtp.codeaurora.org (Postfix) with ESMTPSA id 8D897C43619; Thu, 30 Sep 2021 15:32:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.codeaurora.org 8D897C43619 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=codeaurora.org From: Deepak Kumar Singh To: bjorn.andersson@linaro.org, swboyd@chromium.org, clew@codeaurora.org, mathieu.poirier@linaro.org Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, Deepak Kumar Singh , Ohad Ben-Cohen Subject: [PATCH V1 3/3] rpmsg: char: Add TIOCMGET/TIOCMSET ioctl support Date: Thu, 30 Sep 2021 21:02:04 +0530 Message-Id: <1633015924-881-5-git-send-email-deesin@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1633015924-881-1-git-send-email-deesin@codeaurora.org> References: <1633015924-881-1-git-send-email-deesin@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org Add TICOMGET and TIOCMSET ioctl support for rpmsg char device nodes to get/set the low level transport signals. Signed-off-by: Chris Lew Signed-off-by: Deepak Kumar Singh --- drivers/rpmsg/rpmsg_char.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index 2bebc9b..60a889b 100644 --- a/drivers/rpmsg/rpmsg_char.c +++ b/drivers/rpmsg/rpmsg_char.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include @@ -76,6 +77,9 @@ struct rpmsg_eptdev { spinlock_t queue_lock; struct sk_buff_head queue; wait_queue_head_t readq; + + u32 rsigs; + bool sig_pending; }; static int rpmsg_eptdev_destroy(struct device *dev, void *data) @@ -120,6 +124,18 @@ static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len, return 0; } +static int rpmsg_sigs_cb(struct rpmsg_device *rpdev, void *priv, u32 sigs) +{ + struct rpmsg_eptdev *eptdev = priv; + + eptdev->rsigs = sigs; + eptdev->sig_pending = true; + + /* wake up any blocking processes, waiting for signal notification */ + wake_up_interruptible(&eptdev->readq); + return 0; +} + static int rpmsg_eptdev_open(struct inode *inode, struct file *filp) { struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev); @@ -139,6 +155,7 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp) return -EINVAL; } + ept->sig_cb = rpmsg_sigs_cb; eptdev->ept = ept; filp->private_data = eptdev; @@ -157,6 +174,7 @@ static int rpmsg_eptdev_release(struct inode *inode, struct file *filp) eptdev->ept = NULL; } mutex_unlock(&eptdev->ept_lock); + eptdev->sig_pending = false; /* Discard all SKBs */ skb_queue_purge(&eptdev->queue); @@ -267,6 +285,9 @@ static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait) if (!skb_queue_empty(&eptdev->queue)) mask |= EPOLLIN | EPOLLRDNORM; + if (eptdev->sig_pending) + mask |= EPOLLPRI; + mask |= rpmsg_poll(eptdev->ept, filp, wait); return mask; @@ -276,10 +297,32 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) { struct rpmsg_eptdev *eptdev = fp->private_data; + bool set; + u32 val; + int ret; if (cmd != RPMSG_DESTROY_EPT_IOCTL) return -EINVAL; + switch (cmd) { + case TIOCMGET: + eptdev->sig_pending = false; + ret = put_user(eptdev->rsigs, (int __user *)arg); + break; + case TIOCMSET: + ret = get_user(val, (int __user *)arg); + if (ret) + break; + set = (val & TIOCM_DTR) ? true : false; + ret = rpmsg_set_flow_control(eptdev->ept, set); + break; + case RPMSG_DESTROY_EPT_IOCTL: + ret = rpmsg_eptdev_destroy(&eptdev->dev, NULL); + break; + default: + ret = -EINVAL; + } + return rpmsg_eptdev_destroy(&eptdev->dev, NULL); }