[PATCH v4 12/16] rpmsg: ctrl: introduce RPMSG_CREATE_DEV_IOCTL

[Arnaud Pouliquen]

Implement the RPMSG_CREATE_DEV_IOCTL to allow the user application to
initiate a communication through a new RPMsg channel.
This Ioctl can be used to instantiate a local RPMsg device.
Depending on the back-end implementation, a NS announcement can be sent
to the remote processor.

Suggested-by: Mathieu Poirier <mathieu.poir...@linaro.org>
Signed-off-by: Arnaud Pouliquen <arnaud.pouliq...@foss.st.com>
---
 drivers/rpmsg/rpmsg_ctrl.c | 21 +++++++++++++++++----
 include/uapi/linux/rpmsg.h |  5 +++++
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/rpmsg/rpmsg_ctrl.c b/drivers/rpmsg/rpmsg_ctrl.c
index 2e43b4096aa8..78c13816bfc6 100644
--- a/drivers/rpmsg/rpmsg_ctrl.c
+++ b/drivers/rpmsg/rpmsg_ctrl.c
@@ -70,9 +70,7 @@ static long rpmsg_ctrl_ioctl(struct file *fp, unsigned int 
cmd, unsigned long ar
        void __user *argp = (void __user *)arg;
        struct rpmsg_endpoint_info eptinfo;
        struct rpmsg_channel_info chinfo;
-
-       if (cmd != RPMSG_CREATE_EPT_IOCTL)
-               return -EINVAL;
+       struct rpmsg_device *newch;
 
        if (copy_from_user(&eptinfo, argp, sizeof(eptinfo)))
                return -EFAULT;
@@ -82,7 +80,22 @@ static long rpmsg_ctrl_ioctl(struct file *fp, unsigned int 
cmd, unsigned long ar
        chinfo.src = eptinfo.src;
        chinfo.dst = eptinfo.dst;
 
-       return rpmsg_chrdev_create_eptdev(ctrldev->rpdev, &ctrldev->dev, 
chinfo);
+       switch (cmd) {
+       case RPMSG_CREATE_EPT_IOCTL:
+               return rpmsg_chrdev_create_eptdev(ctrldev->rpdev, 
&ctrldev->dev, chinfo);
+
+       case RPMSG_CREATE_DEV_IOCTL:
+               newch = rpmsg_create_channel(ctrldev->rpdev, &chinfo);
+               if (!newch) {
+                       dev_err(&ctrldev->dev, "rpmsg_create_channel failed\n");
+                       return -ENXIO;
+               }
+               return 0;
+
+       default:
+               return -EINVAL;
+       }
+
 };
 
 static const struct file_operations rpmsg_ctrl_fops = {
diff --git a/include/uapi/linux/rpmsg.h b/include/uapi/linux/rpmsg.h
index f5ca8740f3fb..f9d5a74e7801 100644
--- a/include/uapi/linux/rpmsg.h
+++ b/include/uapi/linux/rpmsg.h
@@ -33,4 +33,9 @@ struct rpmsg_endpoint_info {
  */
 #define RPMSG_DESTROY_EPT_IOCTL        _IO(0xb5, 0x2)
 
+/**
+ * Instantiate a rpmsg service device.
+ */
+#define RPMSG_CREATE_DEV_IOCTL _IOW(0xb5, 0x3, struct rpmsg_endpoint_info)
+
 #endif
-- 
2.17.1