USB: serial: add metro-usb driver to the tree

This driver is for the Metrologic barcode scanner.
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/metro-usb.c

+/*
+  Date Created:	9/15/2006
+  File Name:		metro-usb.c
+  Description:	metro-usb.c is the drivers main source file. The driver is a USB to Serial converter.
+		The driver takes USB data and sends it to a virtual ttyUSB# serial port.
+		The driver interfaces with the usbserial.ko driver supplied by Linux.
+
+		NOTES:
+		To install the driver:
+		1. Install the usbserial.ko module supplied by Linux with: # insmod usbserial.ko
+		2. Install the metro-usb.ko module with: # insmod metro-usb.ko vender=0x#### product=0x#### debug=1
+		   The vendor, product and debug parameters are optional.
+
+		Some of this code is credited to Linux USB open source files that are distributed with Linux.
+
+  Copyright:	2007 Metrologic Instruments. All rights reserved.
+  Copyright:	2011 Azimut Ltd. <http://azimutrzn.ru/>
+  Requirements: gedit.exe, notepad.exe
+ 
+  Revision History:
+
+  Date:			Developer:			Revisions:
+  ------------------------------------------------------------------------------
+  1/30/2007		Philip Nicastro		Initial release. (v1.0.0.0)
+  2/27/2007		Philip Nicastro		Changed the metrousb_read_int_callback function to use a loop with the tty_insert_flip_char function to copy each byte to the tty layer. Removed the tty_buffer_request_room and the tty_insert_flip_string function calls. These calls were not supported on Fedora.
+  2/27/2007		Philip Nicastro		Released. (v1.1.0.0)
+  10/07/2011		Aleksey Babahin		Update for new kernel (tested on 2.6.38)
+						Add unidirection mode support
+ 
+ 
+*/
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/tty.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/moduleparam.h>
+#include <linux/spinlock.h>
+#include <asm/uaccess.h>
+#include <linux/errno.h>
+#include "metro-usb.h"
+#include <linux/usb/serial.h>
+
+/* Version Information */
+#define DRIVER_VERSION "v1.2.0.0"
+#define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
+
+/* Device table list. */
+static struct usb_device_id id_table [] = {
+	{ USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID) },
+	{ USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) },
+	{ }, /* Optional paramenter entry. */
+	{ }, /* Terminating entry. */
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+/* Input parameter constants. */
+static int debug;
+static __u16 vendor;
+static __u16 product;
+
+/* Function prototypes. */
+static void metrousb_cleanup (struct usb_serial_port *port);
+static void metrousb_close (struct usb_serial_port *port);
+static int  metrousb_open (struct tty_struct *tty, struct usb_serial_port *port);
+static void metrousb_read_int_callback (struct urb *urb);
+static void metrousb_shutdown (struct usb_serial *serial);
+static int metrousb_startup (struct usb_serial *serial);
+static void metrousb_throttle(struct tty_struct *tty);
+static int metrousb_tiocmget(struct tty_struct *tty);
+static int metrousb_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear);
+static void metrousb_unthrottle(struct tty_struct *tty);
+
+/* Driver structure. */
+static struct usb_driver metrousb_driver = {
+	.name =		"metro-usb",
+	.probe =	usb_serial_probe,
+	.disconnect =	usb_serial_disconnect,
+	.id_table =	id_table
+};
+
+/* Device structure. */
+static struct usb_serial_driver metrousb_device = {
+	.driver = {
+		.owner =	THIS_MODULE,
+		.name =		"metro-usb",
+	},
+	.description 		= "Metrologic USB to serial converter.",
+	.id_table 		= id_table,
+	.usb_driver		= &metrousb_driver,
+	.num_ports 		= 1,
+	.open 			= metrousb_open,
+	.close 			= metrousb_close,
+	.read_int_callback 	= metrousb_read_int_callback,
+	.attach 		= metrousb_startup,
+	.release 		= metrousb_shutdown,
+	.throttle          	= metrousb_throttle,
+	.unthrottle        	= metrousb_unthrottle,
+	.tiocmget          	= metrousb_tiocmget,
+	.tiocmset          	= metrousb_tiocmset,
+};
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Clean up any urbs and port information.
+
+  Input:
+	struct usb_serial_port *: pointer to a usb_serial_port structure.
+
+  Output:
+	int: Returns true (0) if successful, false otherwise.
+*/
+static void metrousb_cleanup (struct usb_serial_port *port)
+{
+	dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+
+	if (port->serial->dev) {
+		/* Shutdown any interrupt in urbs. */
+		if (port->interrupt_in_urb) {
+			usb_unlink_urb(port->interrupt_in_urb);
+			usb_kill_urb(port->interrupt_in_urb);
+		}
+
+		// temp
+		// this will be needed for the write urb
+		/* Shutdown any interrupt_out_urbs. */
+		//if (serial->num_bulk_in)
+		//	usb_kill_urb(port->read_urb);
+	}
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Close the open serial port. Cleanup any open serial port information.
+
+  Input:
+	struct usb_serial_port *: pointer to a usb_serial_port structure.
+	struct file *: pointer to a file structure.
+
+  Output:
+	int: Returns true (0) if successful, false otherwise.
+*/
+static void metrousb_close (struct usb_serial_port *port)
+{
+	dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+	metrousb_cleanup(port);
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Driver exit.
+
+  Input:
+	None:
+
+  Output:
+	None:
+*/
+static void __exit metrousb_exit(void)
+{
+	dbg("METRO-USB - %s", __FUNCTION__);
+
+	usb_deregister(&metrousb_driver);
+	usb_serial_deregister(&metrousb_device);
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Driver initialization.
+
+  Input:
+	None:
+
+  Output:
+	int: Returns true (0) if successful, false otherwise.
+*/
+static int __init metrousb_init(void)
+{
+	int retval = 0;
+	int i = 0;
+
+	dbg("METRO-USB - %s", __FUNCTION__);
+
+	/* Add the device parameters if entered. */
+	if ((vendor > 0) && (product > 0)) {
+		struct usb_device_id usb_dev_temp[] = { {USB_DEVICE(vendor, product) } };
+
+		/* Find the last entry in id_table */
+		for (i=0; i < ARRAY_SIZE(id_table); i++) {
+			if (id_table[i].idVendor == 0) {
+				id_table[i] = usb_dev_temp[0];
+				break;
+			}
+		}
+
+		dbg("METRO-USB - %s - support added for unknown device: vendor=0x%x - product=0x%x", __FUNCTION__, vendor, product);
+		printk(KERN_INFO "Metro USB-POS support added for unknown device: vendor=0x%x - product=0x%x", vendor, product);
+	}
+
+	/* Register the devices. */
+	retval = usb_serial_register(&metrousb_device);
+	if (retval)
+		return retval;
+
+	/* Register the driver. */
+	retval = usb_register(&metrousb_driver);
+	if (retval)
+		usb_serial_deregister(&metrousb_device);
+
+	printk(KERN_INFO DRIVER_DESC " : " DRIVER_VERSION);
+
+	return retval;
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Open the drivers serial port.
+
+  Input:
+	struct usb_serial_port *: pointer to a usb_serial_port structure.
+	struct file *: pointer to a file structure.
+
+  Output:
+	int: Returns true (0) if successful, false otherwise.
+*/
+static int metrousb_open (struct tty_struct *tty, struct usb_serial_port *port)
+{
+	struct usb_serial *serial = port->serial;
+	struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
+	unsigned long flags = 0;
+	int result = 0;
+
+	dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+
+	/* Make sure the urb is initialized. */
+	if (!port->interrupt_in_urb) {
+		dbg("METRO-USB - %s - interrupt urb not initialized for port number=%d", __FUNCTION__, port->number);
+		return -ENODEV;
+	}
+
+	/* Set the private data information for the port. */
+	spin_lock_irqsave(&metro_priv->lock, flags);
+	metro_priv->control_state = 0;
+	metro_priv->throttled = 0;
+	spin_unlock_irqrestore(&metro_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;
+	}
+
+	/* Clear the urb pipe. */
+	usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe);
+
+	/* Start reading from the device */
+	usb_fill_int_urb (port->interrupt_in_urb, serial->dev,
+			   usb_rcvintpipe (serial->dev, port->interrupt_in_endpointAddress),
+			   port->interrupt_in_urb->transfer_buffer,
+			   port->interrupt_in_urb->transfer_buffer_length,
+			   metrousb_read_int_callback, port, 1);
+	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+
+	if (result) {
+		dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d"
+			, __FUNCTION__, port->number, result);
+		goto exit;
+	}
+
+	dbg("METRO-USB - %s - port open for port number=%d", __FUNCTION__, port->number);
+exit:
+	return result;
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Read the port from the read interrupt.
+
+  Input:
+	struct urb *: urb structure to get data.
+	struct pt_regs *: pt_regs structure.
+
+  Output:
+	None:
+*/
+static void metrousb_read_int_callback (struct urb *urb)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+	struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
+	struct tty_struct *tty;
+	unsigned char *data = urb->transfer_buffer;
+	int throttled = 0;
+	int result = 0;
+	unsigned long flags = 0;
+
+	dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+
+	switch (urb->status) {
+		case 0:
+			/* Success status, read from the port. */
+			break;
+		case -ECONNRESET:
+		case -ENOENT:
+		case -ESHUTDOWN:
+			/* urb has been terminated. */
+			dbg("METRO-USB - %s - urb shutting down, port number=%d, error code=%d",
+				__FUNCTION__, port->number, result);
+			return;
+		default:
+			dbg("METRO-USB - %s - non-zero urb received, port number=%d, error code=%d",
+				__FUNCTION__, port->number, result);
+			goto exit;
+	}
+
+
+	/* Set the data read from the usb port into the serial port buffer. */
+	tty = tty_port_tty_get(&port->port);
+	if (!tty) {
+		dbg("%s - bad tty pointer - exiting", __func__);
+		return;
+	}
+
+	if (tty && urb->actual_length) {
+		// Loop through the data copying each byte to the tty layer.
+		tty_insert_flip_string(tty, data, urb->actual_length);
+
+		// Force the data to the tty layer.
+		tty_flip_buffer_push(tty);
+	}
+	tty_kref_put(tty);
+
+	/* Set any port variables. */
+	spin_lock_irqsave(&metro_priv->lock, flags);
+	throttled = metro_priv->throttled;
+	spin_unlock_irqrestore(&metro_priv->lock, flags);
+
+	/* Continue trying to read if set. */
+	if (!throttled) {
+		usb_fill_int_urb (port->interrupt_in_urb, port->serial->dev,
+				   usb_rcvintpipe (port->serial->dev, port->interrupt_in_endpointAddress),
+				   port->interrupt_in_urb->transfer_buffer,
+				   port->interrupt_in_urb->transfer_buffer_length,
+				   metrousb_read_int_callback, port, 1);
+
+		result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
+
+		if (result) {
+			dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d",
+				__FUNCTION__, port->number, result);
+		}
+	}
+	return;
+
+exit:
+	/* Try to resubmit the urb. */
+	result = usb_submit_urb (urb, GFP_ATOMIC);
+	if (result) {
+		dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d",
+			__FUNCTION__, port->number, result);
+	}
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Set the modem control state for the entered serial port.
+
+  Input:
+	struct usb_serial_port *: pointer to a usb_serial_port structure.
+	unsigned int: control state value to set.
+
+  Output:
+	int: Returns true (0) if successful, false otherwise.
+*/
+static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state)
+{
+	int retval = 0;
+	unsigned char mcr = METROUSB_MCR_NONE;
+
+	dbg("METRO-USB - %s - control state=%d", __FUNCTION__, control_state);
+
+	/* Set the modem control value. */
+	if (control_state & TIOCM_DTR)
+		mcr |= METROUSB_MCR_DTR;
+	if (control_state & TIOCM_RTS)
+		mcr |= METROUSB_MCR_RTS;
+
+	/* Send the command to the usb port. */
+	retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
+				METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST,
+				control_state, 0, NULL, 0, WDR_TIMEOUT);
+	if (retval < 0)
+		dbg("METRO-USB - %s - set modem ctrl=0x%x failed, error code=%d", __FUNCTION__, mcr, retval);
+
+	return retval;
+}
+
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Shutdown the driver.
+
+  Input:
+	struct usb_serial *: pointer to a usb-serial structure.
+
+  Output:
+	int: Returns true (0) if successful, false otherwise.
+*/
+static void metrousb_shutdown (struct usb_serial *serial)
+{
+	int i = 0;
+
+	dbg("METRO-USB - %s", __FUNCTION__);
+
+	/* Stop reading and writing on all ports. */
+	for (i=0; i < serial->num_ports; ++i) {
+		/* Close any open urbs. */
+		metrousb_cleanup(serial->port[i]);
+
+		/* Free memory. */
+		kfree(usb_get_serial_port_data(serial->port[i]));
+		usb_set_serial_port_data(serial->port[i], NULL);
+
+		dbg("METRO-USB - %s - freed port number=%d", __FUNCTION__, serial->port[i]->number);
+	}
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Startup the driver.
+
+  Input:
+	struct usb_serial *: pointer to a usb-serial structure.
+
+  Output:
+	int: Returns true (0) if successful, false otherwise.
+*/
+static int metrousb_startup(struct usb_serial *serial)
+{
+	struct metrousb_private *metro_priv;
+	struct usb_serial_port *port;
+	int i = 0;
+
+	dbg("METRO-USB - %s", __FUNCTION__);
+
+	/* Loop through the serial ports setting up the private structures.
+	 * Currently we only use one port. */
+	for (i = 0; i < serial->num_ports; ++i) {
+		port = serial->port[i];
+
+		/* Declare memory. */
+		metro_priv = (struct metrousb_private *) kmalloc (sizeof(struct metrousb_private), GFP_KERNEL);
+		if (!metro_priv)
+			return -ENOMEM;
+
+		/* Clear memory. */
+		memset (metro_priv, 0x00, sizeof(struct metrousb_private));
+
+		/* Initialize memory. */
+		spin_lock_init(&metro_priv->lock);
+		usb_set_serial_port_data(port, metro_priv);
+
+		dbg("METRO-USB - %s - port number=%d.", __FUNCTION__, port->number);
+	}
+
+	return 0;
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Set the serial port throttle to stop reading from the port.
+
+  Input:
+	struct usb_serial_port *: pointer to a usb_serial_port structure.
+
+  Output:
+	None:
+*/
+static void metrousb_throttle (struct tty_struct *tty)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
+	unsigned long flags = 0;
+
+	dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+
+	/* Set the private information for the port to stop reading data. */
+	spin_lock_irqsave(&metro_priv->lock, flags);
+	metro_priv->throttled = 1;
+	spin_unlock_irqrestore(&metro_priv->lock, flags);
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Get the serial port control line states.
+
+  Input:
+	struct usb_serial_port *: pointer to a usb_serial_port structure.
+	struct file *: pointer to a file structure.
+
+  Output:
+	int: Returns the state of the control lines.
+*/
+static int metrousb_tiocmget (struct tty_struct *tty)
+{
+	unsigned long control_state = 0;
+	struct usb_serial_port *port = tty->driver_data;
+	struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
+	unsigned long flags = 0;
+
+	dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+
+	spin_lock_irqsave(&metro_priv->lock, flags);
+	control_state = metro_priv->control_state;
+	spin_unlock_irqrestore(&metro_priv->lock, flags);
+
+	return control_state;
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Set the serial port control line states.
+
+  Input:
+	struct usb_serial_port *: pointer to a usb_serial_port structure.
+	struct file *: pointer to a file structure.
+	unsigned int: line state to set.
+	unsigned int: line state to clear.
+
+  Output:
+	int: Returns the state of the control lines.
+*/
+static int metrousb_tiocmset (struct tty_struct *tty,
+			       unsigned int set, unsigned int clear)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct usb_serial *serial = port->serial;
+	struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
+	unsigned long flags = 0;
+	unsigned long control_state = 0;
+
+	dbg("METRO-USB - %s - port number=%d, set=%d, clear=%d", __FUNCTION__, port->number, set, clear);
+
+	spin_lock_irqsave(&metro_priv->lock, flags);
+	control_state = metro_priv->control_state;
+
+	// Set the RTS and DTR values.
+	if (set & TIOCM_RTS)
+		control_state |= TIOCM_RTS;
+	if (set & TIOCM_DTR)
+		control_state |= TIOCM_DTR;
+	if (clear & TIOCM_RTS)
+		control_state &= ~TIOCM_RTS;
+	if (clear & TIOCM_DTR)
+		control_state &= ~TIOCM_DTR;
+
+	metro_priv->control_state = control_state;
+	spin_unlock_irqrestore(&metro_priv->lock, flags);
+	return metrousb_set_modem_ctrl(serial, control_state);
+}
+
+/* ----------------------------------------------------------------------------------------------
+  Description:
+	Set the serial port unthrottle to resume reading from the port.
+
+  Input:
+	struct usb_serial_port *: pointer to a usb_serial_port structure.
+
+  Output:
+	None:
+*/
+static void metrousb_unthrottle (struct tty_struct *tty)
+{
+	struct usb_serial_port *port = tty->driver_data;
+	struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
+	unsigned long flags = 0;
+	int result = 0;
+
+	dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
+
+	/* Set the private information for the port to resume reading data. */
+	spin_lock_irqsave(&metro_priv->lock, flags);
+	metro_priv->throttled = 0;
+	spin_unlock_irqrestore(&metro_priv->lock, flags);
+
+	/* Submit the urb to read from the port. */
+	port->interrupt_in_urb->dev = port->serial->dev;
+	result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
+	if (result) {
+		dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d",
+			__FUNCTION__, port->number, result);
+	}
+}
+
+/* Standard module function. */
+module_init(metrousb_init);
+module_exit(metrousb_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR( "Philip Nicastro" );
+MODULE_AUTHOR( "Aleksey Babahin <tamerlan311@gmail.com>" );
+MODULE_DESCRIPTION( DRIVER_DESC );
+
+/* Module input parameters */
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Print debug info (bool 1=on, 0=off)");
+
+module_param(vendor, ushort, 0);
+MODULE_PARM_DESC(vendor, "User specified vendor ID (ushort)");
+
+module_param(product, ushort, 0);
+MODULE_PARM_DESC(product, "User specified product ID (ushort)");
+
+
+
+

drivers/usb/serial/metro-usb.h

+/*
+  Date Created:	1/12/2007
+  File Name:		metro-usb.h
+  Description:	metro-usb.h is the drivers header file. The driver is a USB to Serial converter.
+		The driver takes USB data and sends it to a virtual ttyUSB# serial port.
+		The driver interfaces with the usbserial.ko driver supplied by Linux.
+
+		NOTES:
+		To install the driver:
+		1. Install the usbserial.ko module supplied by Linux with: # insmod usbserial.ko
+		2. Install the metro-usb.ko module with: # insmod metro-usb.ko vender=0x#### product=0x#### debug=1
+		   The vendor, product and debug parameters are optional.
+
+  Copyright:	2007 Metrologic Instruments. All rights reserved.
+  Copyright:	2011 Azimut Ltd. <http://azimutrzn.ru/>
+  Requirements: Notepad.exe
+
+  Revision History:
+
+  Date:			Developer:			Revisions:
+  ------------------------------------------------------------------------------
+  1/12/2007		Philip Nicastro		Initial release. (v1.0.0.0)
+  10/07/2011		Aleksey Babahin		Update for new kernel (tested on 2.6.38)
+						Add unidirection mode support
+
+
+*/
+
+#ifndef __LINUX_USB_SERIAL_METRO
+#define __LINUX_USB_SERIAL_METRO
+
+/* Product information. */
+#define FOCUS_VENDOR_ID		0x0C2E
+#define FOCUS_PRODUCT_ID	0x0720
+#define FOCUS_PRODUCT_ID_UNI	0x0710
+
+#define METROUSB_SET_REQUEST_TYPE	0x40
+#define METROUSB_SET_MODEM_CTRL_REQUEST	10
+#define METROUSB_SET_BREAK_REQUEST	0x40
+#define METROUSB_MCR_NONE               0x8     /* Deactivate DTR and RTS. */
+#define METROUSB_MCR_RTS                0xa     /* Activate RTS. */
+#define METROUSB_MCR_DTR                0x9     /* Activate DTR. */
+#define WDR_TIMEOUT			5000 	/* default urb timeout. */
+
+/* Private data structure. */
+struct metrousb_private {
+	spinlock_t lock;
+	int throttled;
+	unsigned long control_state;
+};
+
+#endif