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-rw-r--r--drivers/remoteproc/remoteproc_debugfs.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/remoteproc/remoteproc_debugfs.c b/drivers/remoteproc/remoteproc_debugfs.c
index 6fdfa688281a..74a120b6e206 100644
--- a/drivers/remoteproc/remoteproc_debugfs.c
+++ b/drivers/remoteproc/remoteproc_debugfs.c
@@ -88,8 +88,42 @@ static ssize_t rproc_state_read(struct file *filp, char __user *userbuf,
return simple_read_from_buffer(userbuf, count, ppos, buf, i);
}
+static ssize_t rproc_state_write(struct file *filp, const char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct rproc *rproc = filp->private_data;
+ char buf[10];
+ int ret;
+
+ if (count > sizeof(buf) || count <= 0)
+ return -EINVAL;
+
+ ret = copy_from_user(buf, userbuf, count);
+ if (ret)
+ return -EFAULT;
+
+ if (buf[count - 1] == '\n')
+ buf[count - 1] = '\0';
+
+ if (!strncmp(buf, "start", count)) {
+ ret = rproc_boot(rproc);
+ if (ret) {
+ dev_err(&rproc->dev, "Boot failed: %d\n", ret);
+ return ret;
+ }
+ } else if (!strncmp(buf, "stop", count)) {
+ rproc_shutdown(rproc);
+ } else {
+ dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
+ return -EINVAL;
+ }
+
+ return count;
+}
+
static const struct file_operations rproc_state_ops = {
.read = rproc_state_read,
+ .write = rproc_state_write,
.open = simple_open,
.llseek = generic_file_llseek,
};

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