USB: serial: add symbol serial driver
This is for the Symbol 6608 barcode scanner in a fake "HID" mode. Thanks to Dalibor Grgec for working with me to get this to start to work properly. Cc: Dalibor Grgec <dalibor.grgec@zemris.fer.hr> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman
parent
f7e7aa5850
commit
68b44eaed5
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@ -515,6 +515,15 @@ config USB_SERIAL_SIERRAWIRELESS
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To compile this driver as a module, choose M here: the
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module will be called sierra.
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config USB_SERIAL_SYMBOL
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tristate "USB Symbol Barcode driver (serial mode)"
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help
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Say Y here if you want to use a Symbol USB Barcode device
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in serial emulation mode.
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To compile this driver as a module, choose M here: the
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module will be called symbolserial.
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config USB_SERIAL_TI
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tristate "USB TI 3410/5052 Serial Driver"
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help
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@ -49,6 +49,7 @@ obj-$(CONFIG_USB_SERIAL_SAFE) += safe_serial.o
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obj-$(CONFIG_USB_SERIAL_SIEMENS_MPI) += siemens_mpi.o
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obj-$(CONFIG_USB_SERIAL_SIERRAWIRELESS) += sierra.o
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obj-$(CONFIG_USB_SERIAL_SPCP8X5) += spcp8x5.o
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obj-$(CONFIG_USB_SERIAL_SYMBOL) += symbolserial.o
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obj-$(CONFIG_USB_SERIAL_TI) += ti_usb_3410_5052.o
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obj-$(CONFIG_USB_SERIAL_VISOR) += visor.o
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obj-$(CONFIG_USB_SERIAL_WHITEHEAT) += whiteheat.o
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@ -0,0 +1,340 @@
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/*
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* Symbol USB barcode to serial driver
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*
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* Copyright (C) 2009 Greg Kroah-Hartman <gregkh@suse.de>
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* Copyright (C) 2009 Novell Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include <linux/uaccess.h>
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static int debug;
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static struct usb_device_id id_table[] = {
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{ USB_DEVICE(0x05e0, 0x0600) },
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{ },
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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/* This structure holds all of the individual device information */
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struct symbol_private {
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struct usb_device *udev;
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struct usb_serial *serial;
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struct usb_serial_port *port;
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unsigned char *int_buffer;
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struct urb *int_urb;
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int buffer_size;
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u8 bInterval;
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u8 int_address;
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spinlock_t lock; /* protects the following flags */
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bool throttled;
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bool actually_throttled;
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bool rts;
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};
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static void symbol_int_callback(struct urb *urb)
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{
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struct symbol_private *priv = urb->context;
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unsigned char *data = urb->transfer_buffer;
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struct usb_serial_port *port = priv->port;
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int status = urb->status;
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struct tty_struct *tty;
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int result;
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int available_room = 0;
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int data_length;
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dbg("%s - port %d", __func__, port->number);
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switch (status) {
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case 0:
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/* success */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d",
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__func__, status);
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return;
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default:
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dbg("%s - nonzero urb status received: %d",
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__func__, status);
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goto exit;
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}
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usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length,
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data);
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if (urb->actual_length > 1) {
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data_length = urb->actual_length - 1;
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/*
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* Data from the device comes with a 1 byte header:
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*
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* <size of data>data...
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* This is real data to be sent to the tty layer
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* we pretty much just ignore the size and send everything
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* else to the tty layer.
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*/
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tty = tty_port_tty_get(&port->port);
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if (tty) {
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available_room = tty_buffer_request_room(tty,
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data_length);
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if (available_room) {
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tty_insert_flip_string(tty, &data[1],
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available_room);
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tty_flip_buffer_push(tty);
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}
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tty_kref_put(tty);
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}
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} else {
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dev_dbg(&priv->udev->dev,
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"Improper ammount of data received from the device, "
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"%d bytes", urb->actual_length);
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}
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exit:
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spin_lock(&priv->lock);
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/* Continue trying to always read if we should */
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if (!priv->throttled) {
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usb_fill_int_urb(priv->int_urb, priv->udev,
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usb_rcvintpipe(priv->udev,
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priv->int_address),
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priv->int_buffer, priv->buffer_size,
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symbol_int_callback, priv, priv->bInterval);
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result = usb_submit_urb(priv->int_urb, GFP_ATOMIC);
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if (result)
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dev_err(&port->dev,
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"%s - failed resubmitting read urb, error %d\n",
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__func__, result);
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} else
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priv->actually_throttled = true;
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spin_unlock(&priv->lock);
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}
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static int symbol_open(struct tty_struct *tty, struct usb_serial_port *port,
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struct file *filp)
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{
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struct symbol_private *priv = usb_get_serial_data(port->serial);
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unsigned long flags;
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int result = 0;
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dbg("%s - port %d", __func__, port->number);
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spin_lock_irqsave(&priv->lock, flags);
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priv->throttled = false;
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priv->actually_throttled = false;
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priv->port = port;
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spin_unlock_irqrestore(&priv->lock, flags);
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/*
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* Force low_latency on so that our tty_push actually forces the data
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* through, otherwise it is scheduled, and with high data rates (like
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* with OHCI) data can get lost.
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*/
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if (tty)
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tty->low_latency = 1;
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/* Start reading from the device */
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usb_fill_int_urb(priv->int_urb, priv->udev,
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usb_rcvintpipe(priv->udev, priv->int_address),
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priv->int_buffer, priv->buffer_size,
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symbol_int_callback, priv, priv->bInterval);
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result = usb_submit_urb(priv->int_urb, GFP_KERNEL);
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if (result)
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dev_err(&port->dev,
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"%s - failed resubmitting read urb, error %d\n",
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__func__, result);
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return result;
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}
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static void symbol_close(struct tty_struct *tty, struct usb_serial_port *port,
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struct file *filp)
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{
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struct symbol_private *priv = usb_get_serial_data(port->serial);
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dbg("%s - port %d", __func__, port->number);
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/* shutdown our urbs */
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usb_kill_urb(priv->int_urb);
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}
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static void symbol_throttle(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct symbol_private *priv = usb_get_serial_data(port->serial);
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unsigned long flags;
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dbg("%s - port %d", __func__, port->number);
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spin_lock_irqsave(&priv->lock, flags);
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priv->throttled = true;
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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static void symbol_unthrottle(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct symbol_private *priv = usb_get_serial_data(port->serial);
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unsigned long flags;
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int result;
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dbg("%s - port %d", __func__, port->number);
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spin_lock_irqsave(&priv->lock, flags);
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priv->throttled = false;
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priv->actually_throttled = false;
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spin_unlock_irqrestore(&priv->lock, flags);
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priv->int_urb->dev = port->serial->dev;
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result = usb_submit_urb(priv->int_urb, GFP_ATOMIC);
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if (result)
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dev_err(&port->dev,
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"%s - failed submitting read urb, error %d\n",
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__func__, result);
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}
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static int symbol_startup(struct usb_serial *serial)
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{
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struct symbol_private *priv;
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struct usb_host_interface *intf;
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int i;
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int retval = -ENOMEM;
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bool int_in_found = false;
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/* create our private serial structure */
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (priv == NULL) {
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dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
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return -ENOMEM;
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}
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spin_lock_init(&priv->lock);
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priv->serial = serial;
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priv->port = serial->port[0];
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priv->udev = serial->dev;
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/* find our interrupt endpoint */
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intf = serial->interface->altsetting;
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for (i = 0; i < intf->desc.bNumEndpoints; ++i) {
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struct usb_endpoint_descriptor *endpoint;
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endpoint = &intf->endpoint[i].desc;
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if (!usb_endpoint_is_int_in(endpoint))
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continue;
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priv->int_urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!priv->int_urb) {
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dev_err(&priv->udev->dev, "out of memory\n");
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goto error;
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}
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priv->buffer_size = le16_to_cpu(endpoint->wMaxPacketSize) * 2;
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priv->int_buffer = kmalloc(priv->buffer_size, GFP_KERNEL);
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if (!priv->int_buffer) {
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dev_err(&priv->udev->dev, "out of memory\n");
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goto error;
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}
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priv->int_address = endpoint->bEndpointAddress;
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priv->bInterval = endpoint->bInterval;
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/* set up our int urb */
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usb_fill_int_urb(priv->int_urb, priv->udev,
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usb_rcvintpipe(priv->udev,
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endpoint->bEndpointAddress),
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priv->int_buffer, priv->buffer_size,
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symbol_int_callback, priv, priv->bInterval);
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int_in_found = true;
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break;
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}
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if (!int_in_found) {
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dev_err(&priv->udev->dev,
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"Error - the proper endpoints were not found!\n");
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goto error;
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}
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usb_set_serial_data(serial, priv);
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return 0;
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error:
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usb_free_urb(priv->int_urb);
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kfree(priv->int_buffer);
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kfree(priv);
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return retval;
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}
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static void symbol_shutdown(struct usb_serial *serial)
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{
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struct symbol_private *priv = usb_get_serial_data(serial);
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dbg("%s", __func__);
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usb_kill_urb(priv->int_urb);
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usb_free_urb(priv->int_urb);
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kfree(priv->int_buffer);
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kfree(priv);
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usb_set_serial_data(serial, NULL);
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}
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static struct usb_driver symbol_driver = {
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.name = "symbol",
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.probe = usb_serial_probe,
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.disconnect = usb_serial_disconnect,
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.id_table = id_table,
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.no_dynamic_id = 1,
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};
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static struct usb_serial_driver symbol_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "symbol",
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},
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.id_table = id_table,
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.usb_driver = &symbol_driver,
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.num_ports = 1,
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.attach = symbol_startup,
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.open = symbol_open,
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.close = symbol_close,
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.shutdown = symbol_shutdown,
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.throttle = symbol_throttle,
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.unthrottle = symbol_unthrottle,
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};
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static int __init symbol_init(void)
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{
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int retval;
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retval = usb_serial_register(&symbol_device);
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if (retval)
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return retval;
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retval = usb_register(&symbol_driver);
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if (retval)
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usb_serial_deregister(&symbol_device);
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return retval;
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}
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static void __exit symbol_exit(void)
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{
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usb_deregister(&symbol_driver);
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usb_serial_deregister(&symbol_device);
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}
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module_init(symbol_init);
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module_exit(symbol_exit);
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MODULE_LICENSE("GPL");
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module_param(debug, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug, "Debug enabled or not");
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