[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/drivers/usb/serial/symbolserial.c b/src/kernel/linux/v4.14/drivers/usb/serial/symbolserial.c
new file mode 100644
index 0000000..0d17272
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/usb/serial/symbolserial.c
@@ -0,0 +1,197 @@
+/*
+ * Symbol USB barcode to serial driver
+ *
+ * Copyright (C) 2013 Johan Hovold <jhovold@gmail.com>
+ * Copyright (C) 2009 Greg Kroah-Hartman <gregkh@suse.de>
+ * Copyright (C) 2009 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include <linux/uaccess.h>
+
+static const struct usb_device_id id_table[] = {
+ { USB_DEVICE(0x05e0, 0x0600) },
+ { },
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+struct symbol_private {
+ spinlock_t lock; /* protects the following flags */
+ bool throttled;
+ bool actually_throttled;
+};
+
+static void symbol_int_callback(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ struct symbol_private *priv = usb_get_serial_port_data(port);
+ unsigned char *data = urb->transfer_buffer;
+ int status = urb->status;
+ int result;
+ int data_length;
+
+ switch (status) {
+ case 0:
+ /* success */
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* this urb is terminated, clean up */
+ dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
+ __func__, status);
+ return;
+ default:
+ dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
+ __func__, status);
+ goto exit;
+ }
+
+ usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
+
+ /*
+ * Data from the device comes with a 1 byte header:
+ *
+ * <size of data> <data>...
+ */
+ if (urb->actual_length > 1) {
+ data_length = data[0];
+ if (data_length > (urb->actual_length - 1))
+ data_length = urb->actual_length - 1;
+ tty_insert_flip_string(&port->port, &data[1], data_length);
+ tty_flip_buffer_push(&port->port);
+ } else {
+ dev_dbg(&port->dev, "%s - short packet\n", __func__);
+ }
+
+exit:
+ spin_lock(&priv->lock);
+
+ /* Continue trying to always read if we should */
+ if (!priv->throttled) {
+ result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
+ if (result)
+ dev_err(&port->dev,
+ "%s - failed resubmitting read urb, error %d\n",
+ __func__, result);
+ } else
+ priv->actually_throttled = true;
+ spin_unlock(&priv->lock);
+}
+
+static int symbol_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+ struct symbol_private *priv = usb_get_serial_port_data(port);
+ unsigned long flags;
+ int result = 0;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->throttled = false;
+ priv->actually_throttled = false;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ /* Start reading from the device */
+ result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+ if (result)
+ dev_err(&port->dev,
+ "%s - failed resubmitting read urb, error %d\n",
+ __func__, result);
+ return result;
+}
+
+static void symbol_close(struct usb_serial_port *port)
+{
+ usb_kill_urb(port->interrupt_in_urb);
+}
+
+static void symbol_throttle(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct symbol_private *priv = usb_get_serial_port_data(port);
+
+ spin_lock_irq(&priv->lock);
+ priv->throttled = true;
+ spin_unlock_irq(&priv->lock);
+}
+
+static void symbol_unthrottle(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct symbol_private *priv = usb_get_serial_port_data(port);
+ int result;
+ bool was_throttled;
+
+ spin_lock_irq(&priv->lock);
+ priv->throttled = false;
+ was_throttled = priv->actually_throttled;
+ priv->actually_throttled = false;
+ spin_unlock_irq(&priv->lock);
+
+ if (was_throttled) {
+ result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+ if (result)
+ dev_err(&port->dev,
+ "%s - failed submitting read urb, error %d\n",
+ __func__, result);
+ }
+}
+
+static int symbol_port_probe(struct usb_serial_port *port)
+{
+ struct symbol_private *priv;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ spin_lock_init(&priv->lock);
+
+ usb_set_serial_port_data(port, priv);
+
+ return 0;
+}
+
+static int symbol_port_remove(struct usb_serial_port *port)
+{
+ struct symbol_private *priv = usb_get_serial_port_data(port);
+
+ kfree(priv);
+
+ return 0;
+}
+
+static struct usb_serial_driver symbol_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "symbol",
+ },
+ .id_table = id_table,
+ .num_ports = 1,
+ .num_interrupt_in = 1,
+ .port_probe = symbol_port_probe,
+ .port_remove = symbol_port_remove,
+ .open = symbol_open,
+ .close = symbol_close,
+ .throttle = symbol_throttle,
+ .unthrottle = symbol_unthrottle,
+ .read_int_callback = symbol_int_callback,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+ &symbol_device, NULL
+};
+
+module_usb_serial_driver(serial_drivers, id_table);
+
+MODULE_LICENSE("GPL");