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

[Arun Kumar Neelakantam]

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 <ane...@codeaurora.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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