remoteproc: debugfs: Add ability to boot remote processor using debugfs

This functionality is especially useful during the testing phase.  When
used in conjunction with Mailbox's Test Framework we can trivially conduct
end-to-end testing i.e. boot co-processor, send and receive messages to
the co-processor, then shut it down again (repeat as required).

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

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,
 };