remoteproc: sysfs: add attribute to get remote message

Add sysfs device file attribute to get message from remote.

Signed-off-by: Wendy Liang <wendy.liang@xilinx.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c
index 437b887a58f54ce3c9ac52e0e70ddb1e1b5d46eb..c11916a86539e63c01d4c87a52ab4e97caf05b91 100644 (file)
--- a/drivers/remoteproc/remoteproc_sysfs.c
+++ b/drivers/remoteproc/remoteproc_sysfs.c
@@ -195,6 +195,32 @@ static ssize_t remote_kick_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(remote_kick);
 
+/**
+ * remote_pending_message_show() - Show pending message sent from remote
+ * @dev: remoteproc device
+ * @attr: sysfs device attribute
+ * @buf: sysfs buffer
+ *
+ * It shows the pending message sent from remote
+ *
+ * Return: length of pending remote message.
+ */
+static ssize_t remote_pending_message_show(struct device *dev,
+                                          struct device_attribute *attr,
+                                          char *buf)
+{
+       struct rproc *rproc = to_rproc(dev);
+       size_t len;
+
+       if (rproc_peek_remote_kick(rproc, buf, &len)) {
+               buf[len] = '0';
+               return len;
+       } else {
+               return -EAGAIN;
+       }
+}
+static DEVICE_ATTR_RO(remote_pending_message);
+
 static struct attribute *rproc_attrs[] = {
        &dev_attr_firmware.attr,
        &dev_attr_state.attr,
@@ -237,8 +263,15 @@ int rproc_create_kick_sysfs(struct rproc *rproc)
                return ret;
        }
        ret = sysfs_create_file(&dev->kobj, &dev_attr_remote_kick.attr);
-       if (ret)
+       if (ret) {
                dev_err(dev, "failed to create sysfs for remote kick.\n");
+               return ret;
+       }
+       ret = sysfs_create_file(&dev->kobj,
+                               &dev_attr_remote_pending_message.attr);
+       if (ret)
+               dev_err(dev,
+                       "failed to create sysfs for remote pending message.\n");
        return ret;
 }
 EXPORT_SYMBOL(rproc_create_kick_sysfs);