linux-kernel - [PATCH 3/5] rpmsg: Add TIOCMGET/TIOCMSET ioctl support

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Message-Id: <1538566463-24627-4-git-send-email-aneela@codeaurora.org>
Date:   Wed,  3 Oct 2018 17:04:21 +0530
From:   Arun Kumar Neelakantam <aneela@...eaurora.org>
To:     ohad@...ery.com, bjorn.andersson@...aro.org, clew@...eaurora.org,
        sricharan@...eaurora.org
Cc:     linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arun Kumar Neelakantam <aneela@...eaurora.org>
Subject: [PATCH 3/5] rpmsg: Add TIOCMGET/TIOCMSET ioctl support

Add TICOMGET and TIOCMSET ioctl support for rpmsg char device nodes
to get/set the low level transport signals.

Signed-off-by: Arun Kumar Neelakantam <aneela@...eaurora.org>
---
 drivers/rpmsg/rpmsg_char.c | 54 +++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 51 insertions(+), 3 deletions(-)

diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index 86003d5..c983d6c 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -20,6 +20,7 @@
 #include <linux/rpmsg.h>
 #include <linux/skbuff.h>
 #include <linux/slab.h>
+#include <linux/termios.h>
 #include <linux/uaccess.h>
 #include <uapi/linux/rpmsg.h>
 
@@ -274,15 +275,62 @@ static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait)
 	return mask;
 }
 
+static int rpmsg_eptdev_tiocmset(struct file *fp, unsigned int cmd,
+				 unsigned long arg)
+{
+	struct rpmsg_eptdev *eptdev = fp->private_data;
+	u32 lsigs, rsigs, val;
+	int ret;
+
+	ret = get_user(val, (u32 *)arg);
+	if (ret)
+		return ret;
+
+	ret = rpmsg_get_sigs(eptdev->ept, &lsigs, &rsigs);
+	if (ret < 0)
+		return ret;
+
+	switch (cmd) {
+	case TIOCMBIS:
+		lsigs |= val;
+		break;
+	case TIOCMBIC:
+		lsigs &= ~val;
+		break;
+	case TIOCMSET:
+		lsigs = val;
+		break;
+	}
+
+	ret = rpmsg_set_sigs(eptdev->ept, lsigs);
+	return ret;
+}
+
 static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
 			       unsigned long arg)
 {
 	struct rpmsg_eptdev *eptdev = fp->private_data;
+	u32 lsigs, rsigs;
+	int ret;
 
-	if (cmd != RPMSG_DESTROY_EPT_IOCTL)
-		return -EINVAL;
+	switch (cmd) {
+	case TIOCMGET:
+		ret = rpmsg_get_sigs(eptdev->ept, &lsigs, &rsigs);
+		if (!ret)
+			ret = put_user(rsigs, (u32 *)arg);
+		break;
+	case TIOCMSET:
+	case TIOCMBIS:
+	case TIOCMBIC:
+		ret = rpmsg_eptdev_tiocmset(fp, cmd, arg);
+		break;
+	case RPMSG_DESTROY_EPT_IOCTL:
+		ret = rpmsg_eptdev_destroy(&eptdev->dev, NULL);
+	default:
+		ret = -EINVAL;
+	}
 
-	return rpmsg_eptdev_destroy(&eptdev->dev, NULL);
+	return ret;
 }
 
 static const struct file_operations rpmsg_eptdev_fops = {
-- 
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