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- /*
- * 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_startup(struct usb_serial *serial)
- {
- if (!serial->num_interrupt_in) {
- dev_err(&serial->dev->dev, "no interrupt-in endpoint\n");
- return -ENODEV;
- }
- return 0;
- }
- 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,
- .attach = symbol_startup,
- .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");
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