mei: add mei_cl_write function
consolidate write code to a specific me client in mei_cl_write function
the function is called from mei device write handler and from
mei_cl bus send function
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index e14397b..ecadd00 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -678,6 +678,111 @@
}
/**
+ * mei_cl_write - submit a write cb to mei device
+ assumes device_lock is locked
+ *
+ * @cl: host client
+ * @cl: write callback with filled data
+ *
+ * returns numbe of bytes sent on success, <0 on failure.
+ */
+int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
+{
+ struct mei_device *dev;
+ struct mei_msg_data *buf;
+ struct mei_msg_hdr mei_hdr;
+ int rets;
+
+
+ if (WARN_ON(!cl || !cl->dev))
+ return -ENODEV;
+
+ if (WARN_ON(!cb))
+ return -EINVAL;
+
+ dev = cl->dev;
+
+
+ buf = &cb->request_buffer;
+
+ dev_dbg(&dev->pdev->dev, "mei_cl_write %d\n", buf->size);
+
+
+ cb->fop_type = MEI_FOP_WRITE;
+
+ rets = mei_cl_flow_ctrl_creds(cl);
+ if (rets < 0)
+ goto err;
+
+ /* Host buffer is not ready, we queue the request */
+ if (rets == 0 || !dev->hbuf_is_ready) {
+ cb->buf_idx = 0;
+ /* unseting complete will enqueue the cb for write */
+ mei_hdr.msg_complete = 0;
+ cl->writing_state = MEI_WRITING;
+ rets = buf->size;
+ goto out;
+ }
+
+ dev->hbuf_is_ready = false;
+
+ /* Check for a maximum length */
+ if (buf->size > mei_hbuf_max_len(dev)) {
+ mei_hdr.length = mei_hbuf_max_len(dev);
+ mei_hdr.msg_complete = 0;
+ } else {
+ mei_hdr.length = buf->size;
+ mei_hdr.msg_complete = 1;
+ }
+
+ mei_hdr.host_addr = cl->host_client_id;
+ mei_hdr.me_addr = cl->me_client_id;
+ mei_hdr.reserved = 0;
+
+ dev_dbg(&dev->pdev->dev, "write " MEI_HDR_FMT "\n",
+ MEI_HDR_PRM(&mei_hdr));
+
+
+ if (mei_write_message(dev, &mei_hdr, buf->data)) {
+ rets = -EIO;
+ goto err;
+ }
+
+ cl->writing_state = MEI_WRITING;
+ cb->buf_idx = mei_hdr.length;
+
+ rets = buf->size;
+out:
+ if (mei_hdr.msg_complete) {
+ if (mei_cl_flow_ctrl_reduce(cl)) {
+ rets = -ENODEV;
+ goto err;
+ }
+ list_add_tail(&cb->list, &dev->write_waiting_list.list);
+ } else {
+ list_add_tail(&cb->list, &dev->write_list.list);
+ }
+
+
+ if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
+
+ mutex_unlock(&dev->device_lock);
+ if (wait_event_interruptible(cl->tx_wait,
+ cl->writing_state == MEI_WRITE_COMPLETE)) {
+ if (signal_pending(current))
+ rets = -EINTR;
+ else
+ rets = -ERESTARTSYS;
+ }
+ mutex_lock(&dev->device_lock);
+ }
+err:
+ return rets;
+}
+
+
+
+/**
* mei_cl_all_disconnect - disconnect forcefully all connected clients
*
* @dev - mei device