--- /dev/null
+/*
+ * Symbol USB barcode to serial driver
+ *
+ * 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/init.h>
+#include <linux/tty.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 int debug;
+
+static struct usb_device_id id_table[] = {
+ { USB_DEVICE(0x05e0, 0x0600) },
+ { },
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+/* This structure holds all of the individual device information */
+struct symbol_private {
+ struct usb_device *udev;
+ struct usb_serial *serial;
+ struct usb_serial_port *port;
+ unsigned char *int_buffer;
+ struct urb *int_urb;
+ int buffer_size;
+ u8 bInterval;
+ u8 int_address;
+ spinlock_t lock; /* protects the following flags */
+ bool throttled;
+ bool actually_throttled;
+ bool rts;
+};
+
+static void symbol_int_callback(struct urb *urb)
+{
+ struct symbol_private *priv = urb->context;
+ unsigned char *data = urb->transfer_buffer;
+ struct usb_serial_port *port = priv->port;
+ int status = urb->status;
+ struct tty_struct *tty;
+ int result;
+ int available_room = 0;
+ int data_length;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ switch (status) {
+ case 0:
+ /* success */
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* this urb is terminated, clean up */
+ dbg("%s - urb shutting down with status: %d",
+ __func__, status);
+ return;
+ default:
+ dbg("%s - nonzero urb status received: %d",
+ __func__, status);
+ goto exit;
+ }
+
+ usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length,
+ data);
+
+ if (urb->actual_length > 1) {
+ data_length = urb->actual_length - 1;
+
+ /*
+ * Data from the device comes with a 1 byte header:
+ *
+ * <size of data>data...
+ * This is real data to be sent to the tty layer
+ * we pretty much just ignore the size and send everything
+ * else to the tty layer.
+ */
+ tty = tty_port_tty_get(&port->port);
+ if (tty) {
+ available_room = tty_buffer_request_room(tty,
+ data_length);
+ if (available_room) {
+ tty_insert_flip_string(tty, &data[1],
+ available_room);
+ tty_flip_buffer_push(tty);
+ }
+ tty_kref_put(tty);
+ }
+ } else {
+ dev_dbg(&priv->udev->dev,
+ "Improper ammount of data received from the device, "
+ "%d bytes", urb->actual_length);
+ }
+
+exit:
+ spin_lock(&priv->lock);
+
+ /* Continue trying to always read if we should */
+ if (!priv->throttled) {
+ usb_fill_int_urb(priv->int_urb, priv->udev,
+ usb_rcvintpipe(priv->udev,
+ priv->int_address),
+ priv->int_buffer, priv->buffer_size,
+ symbol_int_callback, priv, priv->bInterval);
+ result = usb_submit_urb(priv->int_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 file *filp)
+{
+ struct symbol_private *priv = usb_get_serial_data(port->serial);
+ unsigned long flags;
+ int result = 0;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->throttled = false;
+ priv->actually_throttled = false;
+ priv->port = port;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ /*
+ * Force low_latency on so that our tty_push actually forces the data
+ * through, otherwise it is scheduled, and with high data rates (like
+ * with OHCI) data can get lost.
+ */
+ if (tty)
+ tty->low_latency = 1;
+
+ /* Start reading from the device */
+ usb_fill_int_urb(priv->int_urb, priv->udev,
+ usb_rcvintpipe(priv->udev, priv->int_address),
+ priv->int_buffer, priv->buffer_size,
+ symbol_int_callback, priv, priv->bInterval);
+ result = usb_submit_urb(priv->int_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 tty_struct *tty, struct usb_serial_port *port,
+ struct file *filp)
+{
+ struct symbol_private *priv = usb_get_serial_data(port->serial);
+
+ dbg("%s - port %d", __func__, port->number);
+
+ /* shutdown our urbs */
+ usb_kill_urb(priv->int_urb);
+}
+
+static void symbol_throttle(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct symbol_private *priv = usb_get_serial_data(port->serial);
+ unsigned long flags;
+
+ dbg("%s - port %d", __func__, port->number);
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->throttled = true;
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static void symbol_unthrottle(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct symbol_private *priv = usb_get_serial_data(port->serial);
+ unsigned long flags;
+ int result;
+
+ dbg("%s - port %d", __func__, port->number);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->throttled = false;
+ priv->actually_throttled = false;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ priv->int_urb->dev = port->serial->dev;
+ result = usb_submit_urb(priv->int_urb, GFP_ATOMIC);
+ if (result)
+ dev_err(&port->dev,
+ "%s - failed submitting read urb, error %d\n",
+ __func__, result);
+}
+
+static int symbol_startup(struct usb_serial *serial)
+{
+ struct symbol_private *priv;
+ struct usb_host_interface *intf;
+ int i;
+ int retval = -ENOMEM;
+ bool int_in_found = false;
+
+ /* create our private serial structure */
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (priv == NULL) {
+ dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
+ return -ENOMEM;
+ }
+ spin_lock_init(&priv->lock);
+ priv->serial = serial;
+ priv->port = serial->port[0];
+ priv->udev = serial->dev;
+
+ /* find our interrupt endpoint */
+ intf = serial->interface->altsetting;
+ for (i = 0; i < intf->desc.bNumEndpoints; ++i) {
+ struct usb_endpoint_descriptor *endpoint;
+
+ endpoint = &intf->endpoint[i].desc;
+ if (!usb_endpoint_is_int_in(endpoint))
+ continue;
+
+ priv->int_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!priv->int_urb) {
+ dev_err(&priv->udev->dev, "out of memory\n");
+ goto error;
+ }
+
+ priv->buffer_size = le16_to_cpu(endpoint->wMaxPacketSize) * 2;
+ priv->int_buffer = kmalloc(priv->buffer_size, GFP_KERNEL);
+ if (!priv->int_buffer) {
+ dev_err(&priv->udev->dev, "out of memory\n");
+ goto error;
+ }
+
+ priv->int_address = endpoint->bEndpointAddress;
+ priv->bInterval = endpoint->bInterval;
+
+ /* set up our int urb */
+ usb_fill_int_urb(priv->int_urb, priv->udev,
+ usb_rcvintpipe(priv->udev,
+ endpoint->bEndpointAddress),
+ priv->int_buffer, priv->buffer_size,
+ symbol_int_callback, priv, priv->bInterval);
+
+ int_in_found = true;
+ break;
+ }
+
+ if (!int_in_found) {
+ dev_err(&priv->udev->dev,
+ "Error - the proper endpoints were not found!\n");
+ goto error;
+ }
+
+ usb_set_serial_data(serial, priv);
+ return 0;
+
+error:
+ usb_free_urb(priv->int_urb);
+ kfree(priv->int_buffer);
+ kfree(priv);
+ return retval;
+}
+
+static void symbol_shutdown(struct usb_serial *serial)
+{
+ struct symbol_private *priv = usb_get_serial_data(serial);
+
+ dbg("%s", __func__);
+
+ usb_kill_urb(priv->int_urb);
+ usb_free_urb(priv->int_urb);
+ kfree(priv->int_buffer);
+ kfree(priv);
+ usb_set_serial_data(serial, NULL);
+}
+
+static struct usb_driver symbol_driver = {
+ .name = "symbol",
+ .probe = usb_serial_probe,
+ .disconnect = usb_serial_disconnect,
+ .id_table = id_table,
+ .no_dynamic_id = 1,
+};
+
+static struct usb_serial_driver symbol_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "symbol",
+ },
+ .id_table = id_table,
+ .usb_driver = &symbol_driver,
+ .num_ports = 1,
+ .attach = symbol_startup,
+ .open = symbol_open,
+ .close = symbol_close,
+ .shutdown = symbol_shutdown,
+ .throttle = symbol_throttle,
+ .unthrottle = symbol_unthrottle,
+};
+
+static int __init symbol_init(void)
+{
+ int retval;
+
+ retval = usb_serial_register(&symbol_device);
+ if (retval)
+ return retval;
+ retval = usb_register(&symbol_driver);
+ if (retval)
+ usb_serial_deregister(&symbol_device);
+ return retval;
+}
+
+static void __exit symbol_exit(void)
+{
+ usb_deregister(&symbol_driver);
+ usb_serial_deregister(&symbol_device);
+}
+
+module_init(symbol_init);
+module_exit(symbol_exit);
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
projects / platform / kernel / linux-starfive.git / commitdiff