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

Arun Kumar Neelakantam
2018-10-03T11:34:21Z

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@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 = {