USB: add new opticon serial driver
This is for the serial mode of the Opticon barcode scanner. Cc: Kees Stoop <kees.stoop@opticon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman
Родитель
327d74f6b6
Коммит
57262b82d6
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@ -565,6 +565,15 @@ config USB_SERIAL_OMNINET
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To compile this driver as a module, choose M here: the
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module will be called omninet.
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config USB_SERIAL_OPTICON
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tristate "USB Opticon Barcode driver (serial mode)"
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help
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Say Y here if you want to use a Opticon 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 opticon.
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config USB_SERIAL_DEBUG
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tristate "USB Debugging Device"
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help
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@ -41,6 +41,7 @@ obj-$(CONFIG_USB_SERIAL_MOS7840) += mos7840.o
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obj-$(CONFIG_USB_SERIAL_MOTOROLA) += moto_modem.o
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obj-$(CONFIG_USB_SERIAL_NAVMAN) += navman.o
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obj-$(CONFIG_USB_SERIAL_OMNINET) += omninet.o
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obj-$(CONFIG_USB_SERIAL_OPTICON) += opticon.o
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obj-$(CONFIG_USB_SERIAL_OPTION) += option.o
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obj-$(CONFIG_USB_SERIAL_OTI6858) += oti6858.o
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obj-$(CONFIG_USB_SERIAL_PL2303) += pl2303.o
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@ -0,0 +1,358 @@
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/*
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* Opticon USB barcode to serial driver
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*
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* Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
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* Copyright (C) 2008 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(0x065a, 0x0009) },
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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 opticon_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 *bulk_in_buffer;
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struct urb *bulk_read_urb;
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int buffer_size;
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u8 bulk_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 opticon_bulk_callback(struct urb *urb)
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{
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struct opticon_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 > 2) {
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data_length = urb->actual_length - 2;
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/*
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* Data from the device comes with a 2 byte header:
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*
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* <0x00><0x00>data...
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* This is real data to be sent to the tty layer
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* <0x00><0x01)level
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* This is a RTS level change, the third byte is the RTS
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* value (0 for low, 1 for high).
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*/
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if ((data[0] == 0x00) && (data[1] == 0x00)) {
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/* real data, send it to the tty layer */
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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,
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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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if ((data[0] == 0x00) && (data[1] == 0x01)) {
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if (data[2] == 0x00)
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priv->rts = false;
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else
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priv->rts = true;
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/* FIXME change the RTS level */
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} else {
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dev_dbg(&priv->udev->dev,
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"Unknown data packet received from the device:"
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" %2x %2x\n",
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data[0], data[1]);
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}
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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_bulk_urb(priv->bulk_read_urb, priv->udev,
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usb_rcvbulkpipe(priv->udev,
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priv->bulk_address),
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priv->bulk_in_buffer, priv->buffer_size,
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opticon_bulk_callback, priv);
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result = usb_submit_urb(port->read_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 opticon_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 opticon_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_bulk_urb(priv->bulk_read_urb, priv->udev,
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usb_rcvbulkpipe(priv->udev,
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priv->bulk_address),
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priv->bulk_in_buffer, priv->buffer_size,
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opticon_bulk_callback, priv);
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result = usb_submit_urb(priv->bulk_read_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 opticon_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 opticon_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->bulk_read_urb);
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}
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static void opticon_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 opticon_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 opticon_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 opticon_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->bulk_read_urb->dev = port->serial->dev;
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result = usb_submit_urb(priv->bulk_read_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 opticon_startup(struct usb_serial *serial)
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{
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struct opticon_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 bulk_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 bulk 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_bulk_in(endpoint))
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continue;
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priv->bulk_read_urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!priv->bulk_read_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->bulk_in_buffer = kmalloc(priv->buffer_size, GFP_KERNEL);
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if (!priv->bulk_in_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->bulk_address = endpoint->bEndpointAddress;
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/* set up our bulk urb */
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usb_fill_bulk_urb(priv->bulk_read_urb, priv->udev,
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usb_rcvbulkpipe(priv->udev,
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endpoint->bEndpointAddress),
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priv->bulk_in_buffer, priv->buffer_size,
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opticon_bulk_callback, priv);
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bulk_in_found = true;
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break;
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}
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if (!bulk_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->bulk_read_urb);
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kfree(priv->bulk_in_buffer);
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kfree(priv);
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return retval;
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}
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static void opticon_shutdown(struct usb_serial *serial)
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{
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struct opticon_private *priv = usb_get_serial_data(serial);
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dbg("%s", __func__);
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usb_kill_urb(priv->bulk_read_urb);
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usb_free_urb(priv->bulk_read_urb);
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kfree(priv->bulk_in_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 opticon_driver = {
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.name = "opticon",
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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 opticon_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "opticon",
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},
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.id_table = id_table,
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.usb_driver = &opticon_driver,
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.num_ports = 1,
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.attach = opticon_startup,
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.open = opticon_open,
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.close = opticon_close,
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.shutdown = opticon_shutdown,
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.throttle = opticon_throttle,
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.unthrottle = opticon_unthrottle,
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};
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static int __init opticon_init(void)
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{
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int retval;
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retval = usb_serial_register(&opticon_device);
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if (retval)
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return retval;
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retval = usb_register(&opticon_driver);
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if (retval)
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usb_serial_deregister(&opticon_device);
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return retval;
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}
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static void __exit opticon_exit(void)
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{
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usb_deregister(&opticon_driver);
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usb_serial_deregister(&opticon_device);
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}
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module_init(opticon_init);
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module_exit(opticon_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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