/drivers/usb/serial/symbolserial.c
https://bitbucket.org/slukk/jb-tsm-kernel-4.2 · C · 335 lines · 258 code · 50 blank · 27 comment · 18 complexity · cde19574b6f141d87d854178be22f8ba MD5 · raw file
- /*
- * 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/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 int debug;
- static const 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 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) {
- tty_insert_flip_string(tty, &data[1], data_length);
- tty_flip_buffer_push(tty);
- tty_kref_put(tty);
- }
- } else {
- dev_dbg(&priv->udev->dev,
- "Improper amount 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 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);
- /* 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 usb_serial_port *port)
- {
- 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);
- dbg("%s - port %d", __func__, port->number);
- 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_data(port->serial);
- int result;
- bool was_throttled;
- dbg("%s - port %d", __func__, port->number);
- spin_lock_irq(&priv->lock);
- priv->throttled = false;
- was_throttled = priv->actually_throttled;
- priv->actually_throttled = false;
- spin_unlock_irq(&priv->lock);
- priv->int_urb->dev = port->serial->dev;
- if (was_throttled) {
- result = usb_submit_urb(priv->int_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)
- {
- 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_disconnect(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);
- }
- static void symbol_release(struct usb_serial *serial)
- {
- struct symbol_private *priv = usb_get_serial_data(serial);
- dbg("%s", __func__);
- kfree(priv->int_buffer);
- kfree(priv);
- }
- 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,
- .disconnect = symbol_disconnect,
- .release = symbol_release,
- .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");