[mirror_ubuntu-bionic-kernel.git] / drivers / usb / serial / cyberjack.c

// SPDX-License-Identifier: GPL-2.0+
/*
 *  REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver
 *
 *  Copyright (C) 2001  REINER SCT
 *  Author: Matthias Bruestle
 *
 *  Contact: support@reiner-sct.com (see MAINTAINERS)
 *
 *  This program is largely derived from work by the linux-usb group
 *  and associated source files.  Please see the usb/serial files for
 *  individual credits and copyrights.
 *
 *  Thanks to Greg Kroah-Hartman (greg@kroah.com) for his help and
 *  patience.
 *
 *  In case of problems, please write to the contact e-mail address
 *  mentioned above.
 *
 *  Please note that later models of the cyberjack reader family are
 *  supported by a libusb-based userspace device driver.
 *
 *  Homepage: http://www.reiner-sct.de/support/treiber_cyberjack.php#linux
 */


#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>

#define CYBERJACK_LOCAL_BUF_SIZE 32

#define DRIVER_AUTHOR "Matthias Bruestle"
#define DRIVER_DESC "REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver"


#define CYBERJACK_VENDOR_ID	0x0C4B
#define CYBERJACK_PRODUCT_ID	0x0100

/* Function prototypes */
static int cyberjack_port_probe(struct usb_serial_port *port);
static int cyberjack_port_remove(struct usb_serial_port *port);
static int  cyberjack_open(struct tty_struct *tty,
	struct usb_serial_port *port);
static void cyberjack_close(struct usb_serial_port *port);
static int cyberjack_write(struct tty_struct *tty,
	struct usb_serial_port *port, const unsigned char *buf, int count);
static int cyberjack_write_room(struct tty_struct *tty);
static void cyberjack_read_int_callback(struct urb *urb);
static void cyberjack_read_bulk_callback(struct urb *urb);
static void cyberjack_write_bulk_callback(struct urb *urb);

static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(CYBERJACK_VENDOR_ID, CYBERJACK_PRODUCT_ID) },
	{ }			/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, id_table);

static struct usb_serial_driver cyberjack_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"cyberjack",
	},
	.description =		"Reiner SCT Cyberjack USB card reader",
	.id_table =		id_table,
	.num_ports =		1,
	.num_bulk_out =		1,
	.port_probe =		cyberjack_port_probe,
	.port_remove =		cyberjack_port_remove,
	.open =			cyberjack_open,
	.close =		cyberjack_close,
	.write =		cyberjack_write,
	.write_room =		cyberjack_write_room,
	.read_int_callback =	cyberjack_read_int_callback,
	.read_bulk_callback =	cyberjack_read_bulk_callback,
	.write_bulk_callback =	cyberjack_write_bulk_callback,
};

static struct usb_serial_driver * const serial_drivers[] = {
	&cyberjack_device, NULL
};

struct cyberjack_private {
	spinlock_t	lock;		/* Lock for SMP */
	short		rdtodo;		/* Bytes still to read */
	unsigned char	wrbuf[5*64];	/* Buffer for collecting data to write */
	short		wrfilled;	/* Overall data size we already got */
	short		wrsent;		/* Data already sent */
};

static int cyberjack_port_probe(struct usb_serial_port *port)
{
	struct cyberjack_private *priv;
	int result;

	priv = kmalloc(sizeof(struct cyberjack_private), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	spin_lock_init(&priv->lock);
	priv->rdtodo = 0;
	priv->wrfilled = 0;
	priv->wrsent = 0;

	usb_set_serial_port_data(port, priv);

	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
	if (result)
		dev_err(&port->dev, "usb_submit_urb(read int) failed\n");

	return 0;
}

static int cyberjack_port_remove(struct usb_serial_port *port)
{
	struct cyberjack_private *priv;

	usb_kill_urb(port->interrupt_in_urb);

	priv = usb_get_serial_port_data(port);
	kfree(priv);

	return 0;
}

static int  cyberjack_open(struct tty_struct *tty,
					struct usb_serial_port *port)
{
	struct cyberjack_private *priv;
	unsigned long flags;

	dev_dbg(&port->dev, "%s - usb_clear_halt\n", __func__);
	usb_clear_halt(port->serial->dev, port->write_urb->pipe);

	priv = usb_get_serial_port_data(port);
	spin_lock_irqsave(&priv->lock, flags);
	priv->rdtodo = 0;
	priv->wrfilled = 0;
	priv->wrsent = 0;
	spin_unlock_irqrestore(&priv->lock, flags);

	return 0;
}

static void cyberjack_close(struct usb_serial_port *port)
{
	usb_kill_urb(port->write_urb);
	usb_kill_urb(port->read_urb);
}

static int cyberjack_write(struct tty_struct *tty,
	struct usb_serial_port *port, const unsigned char *buf, int count)
{
	struct device *dev = &port->dev;
	struct cyberjack_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	int result;
	int wrexpected;

	if (count == 0) {
		dev_dbg(dev, "%s - write request of 0 bytes\n", __func__);
		return 0;
	}

	if (!test_and_clear_bit(0, &port->write_urbs_free)) {
		dev_dbg(dev, "%s - already writing\n", __func__);
		return 0;
	}

	spin_lock_irqsave(&priv->lock, flags);

	if (count+priv->wrfilled > sizeof(priv->wrbuf)) {
		/* To much data for buffer. Reset buffer. */
		priv->wrfilled = 0;
		spin_unlock_irqrestore(&priv->lock, flags);
		set_bit(0, &port->write_urbs_free);
		return 0;
	}

	/* Copy data */
	memcpy(priv->wrbuf + priv->wrfilled, buf, count);

	usb_serial_debug_data(dev, __func__, count, priv->wrbuf + priv->wrfilled);
	priv->wrfilled += count;

	if (priv->wrfilled >= 3) {
		wrexpected = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
		dev_dbg(dev, "%s - expected data: %d\n", __func__, wrexpected);
	} else
		wrexpected = sizeof(priv->wrbuf);

	if (priv->wrfilled >= wrexpected) {
		/* We have enough data to begin transmission */
		int length;

		dev_dbg(dev, "%s - transmitting data (frame 1)\n", __func__);
		length = (wrexpected > port->bulk_out_size) ?
					port->bulk_out_size : wrexpected;

		memcpy(port->write_urb->transfer_buffer, priv->wrbuf, length);
		priv->wrsent = length;

		/* set up our urb */
		port->write_urb->transfer_buffer_length = length;

		/* send the data out the bulk port */
		result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
		if (result) {
			dev_err(&port->dev,
				"%s - failed submitting write urb, error %d\n",
				__func__, result);
			/* Throw away data. No better idea what to do with it. */
			priv->wrfilled = 0;
			priv->wrsent = 0;
			spin_unlock_irqrestore(&priv->lock, flags);
			set_bit(0, &port->write_urbs_free);
			return 0;
		}

		dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
		dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);

		if (priv->wrsent >= priv->wrfilled) {
			dev_dbg(dev, "%s - buffer cleaned\n", __func__);
			memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
			priv->wrfilled = 0;
			priv->wrsent = 0;
		}
	}

	spin_unlock_irqrestore(&priv->lock, flags);

	return count;
}

static int cyberjack_write_room(struct tty_struct *tty)
{
	/* FIXME: .... */
	return CYBERJACK_LOCAL_BUF_SIZE;
}

static void cyberjack_read_int_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct cyberjack_private *priv = usb_get_serial_port_data(port);
	struct device *dev = &port->dev;
	unsigned char *data = urb->transfer_buffer;
	int status = urb->status;
	int result;

	/* the urb might have been killed. */
	if (status)
		return;

	usb_serial_debug_data(dev, __func__, urb->actual_length, data);

	/* React only to interrupts signaling a bulk_in transfer */
	if (urb->actual_length == 4 && data[0] == 0x01) {
		short old_rdtodo;

		/* This is a announcement of coming bulk_ins. */
		unsigned short size = ((unsigned short)data[3]<<8)+data[2]+3;

		spin_lock(&priv->lock);

		old_rdtodo = priv->rdtodo;

		if (old_rdtodo > SHRT_MAX - size) {
			dev_dbg(dev, "To many bulk_in urbs to do.\n");
			spin_unlock(&priv->lock);
			goto resubmit;
		}

		/* "+=" is probably more fault tolerant than "=" */
		priv->rdtodo += size;

		dev_dbg(dev, "%s - rdtodo: %d\n", __func__, priv->rdtodo);

		spin_unlock(&priv->lock);

		if (!old_rdtodo) {
			result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
			if (result)
				dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
					__func__, result);
			dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
		}
	}

resubmit:
	result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
	if (result)
		dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
	dev_dbg(dev, "%s - usb_submit_urb(int urb)\n", __func__);
}

static void cyberjack_read_bulk_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct cyberjack_private *priv = usb_get_serial_port_data(port);
	struct device *dev = &port->dev;
	unsigned char *data = urb->transfer_buffer;
	short todo;
	int result;
	int status = urb->status;

	usb_serial_debug_data(dev, __func__, urb->actual_length, data);
	if (status) {
		dev_dbg(dev, "%s - nonzero read bulk status received: %d\n",
			__func__, status);
		return;
	}

	if (urb->actual_length) {
		tty_insert_flip_string(&port->port, data, urb->actual_length);
		tty_flip_buffer_push(&port->port);
	}

	spin_lock(&priv->lock);

	/* Reduce urbs to do by one. */
	priv->rdtodo -= urb->actual_length;
	/* Just to be sure */
	if (priv->rdtodo < 0)
		priv->rdtodo = 0;
	todo = priv->rdtodo;

	spin_unlock(&priv->lock);

	dev_dbg(dev, "%s - rdtodo: %d\n", __func__, todo);

	/* Continue to read if we have still urbs to do. */
	if (todo /* || (urb->actual_length==port->bulk_in_endpointAddress)*/) {
		result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
		if (result)
			dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
				__func__, result);
		dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
	}
}

static void cyberjack_write_bulk_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct cyberjack_private *priv = usb_get_serial_port_data(port);
	struct device *dev = &port->dev;
	int status = urb->status;

	set_bit(0, &port->write_urbs_free);
	if (status) {
		dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
			__func__, status);
		return;
	}

	spin_lock(&priv->lock);

	/* only do something if we have more data to send */
	if (priv->wrfilled) {
		int length, blksize, result;

		dev_dbg(dev, "%s - transmitting data (frame n)\n", __func__);

		length = ((priv->wrfilled - priv->wrsent) > port->bulk_out_size) ?
			port->bulk_out_size : (priv->wrfilled - priv->wrsent);

		memcpy(port->write_urb->transfer_buffer,
					priv->wrbuf + priv->wrsent, length);
		priv->wrsent += length;

		/* set up our urb */
		port->write_urb->transfer_buffer_length = length;

		/* send the data out the bulk port */
		result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
		if (result) {
			dev_err(dev, "%s - failed submitting write urb, error %d\n",
				__func__, result);
			/* Throw away data. No better idea what to do with it. */
			priv->wrfilled = 0;
			priv->wrsent = 0;
			goto exit;
		}

		dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
		dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);

		blksize = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;

		if (priv->wrsent >= priv->wrfilled ||
					priv->wrsent >= blksize) {
			dev_dbg(dev, "%s - buffer cleaned\n", __func__);
			memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
			priv->wrfilled = 0;
			priv->wrsent = 0;
		}
	}

exit:
	spin_unlock(&priv->lock);
	usb_serial_port_softint(port);
}

module_usb_serial_driver(serial_drivers, id_table);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
Commit	Line	Data
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0+
1da177e4 LT	2	/*
	3	* REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver
	4	*
	5	* Copyright (C) 2001 REINER SCT
	6	* Author: Matthias Bruestle
	7	*
	8	* Contact: support@reiner-sct.com (see MAINTAINERS)
	9	*
	10	* This program is largely derived from work by the linux-usb group
	11	* and associated source files. Please see the usb/serial files for
	12	* individual credits and copyrights.
	13	*
1da177e4 LT	14	* Thanks to Greg Kroah-Hartman (greg@kroah.com) for his help and
	15	* patience.
	16	*
	17	* In case of problems, please write to the contact e-mail address
	18	* mentioned above.
	19	*
	20	* Please note that later models of the cyberjack reader family are
	21	* supported by a libusb-based userspace device driver.
	22	*
	23	* Homepage: http://www.reiner-sct.de/support/treiber_cyberjack.php#linux
	24	*/
	25
	26
1da177e4 LT	27	#include <linux/kernel.h>
1da177e4 LT	28	#include <linux/errno.h>
1da177e4 LT	29	#include <linux/slab.h>
	30	#include <linux/tty.h>
	31	#include <linux/tty_driver.h>
	32	#include <linux/tty_flip.h>
	33	#include <linux/module.h>
	34	#include <linux/spinlock.h>
b9c52f15	35	#include <linux/uaccess.h>
1da177e4	36	#include <linux/usb.h>
a969888c	37	#include <linux/usb/serial.h>
1da177e4 LT	38
	39	#define CYBERJACK_LOCAL_BUF_SIZE 32
	40
1da177e4 LT	41	#define DRIVER_AUTHOR "Matthias Bruestle"
	42	#define DRIVER_DESC "REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver"
	43
	44
	45	#define CYBERJACK_VENDOR_ID 0x0C4B
	46	#define CYBERJACK_PRODUCT_ID 0x0100
	47
	48	/* Function prototypes */
a9556040 JH	49	static int cyberjack_port_probe(struct usb_serial_port *port);
a9556040 JH	50	static int cyberjack_port_remove(struct usb_serial_port *port);
95da310e	51	static int cyberjack_open(struct tty_struct *tty,
a509a7e4	52	struct usb_serial_port *port);
335f8514	53	static void cyberjack_close(struct usb_serial_port *port);
95da310e AC	54	static int cyberjack_write(struct tty_struct *tty,
95da310e AC	55	struct usb_serial_port port, const unsigned char buf, int count);
b9c52f15	56	static int cyberjack_write_room(struct tty_struct *tty);
95da310e AC	57	static void cyberjack_read_int_callback(struct urb *urb);
	58	static void cyberjack_read_bulk_callback(struct urb *urb);
	59	static void cyberjack_write_bulk_callback(struct urb *urb);
1da177e4	60
7d40d7e8	61	static const struct usb_device_id id_table[] = {
1da177e4 LT	62	{ USB_DEVICE(CYBERJACK_VENDOR_ID, CYBERJACK_PRODUCT_ID) },
	63	{ } /* Terminating entry */
	64	};
	65
b9c52f15	66	MODULE_DEVICE_TABLE(usb, id_table);
1da177e4	67
ea65370d	68	static struct usb_serial_driver cyberjack_device = {
18fcac35 GKH	69	.driver = {
18fcac35 GKH	70	.owner = THIS_MODULE,
269bda1c	71	.name = "cyberjack",
18fcac35	72	},
269bda1c	73	.description = "Reiner SCT Cyberjack USB card reader",
1da177e4	74	.id_table = id_table,
1da177e4	75	.num_ports = 1,
d183b9b4	76	.num_bulk_out = 1,
a9556040 JH	77	.port_probe = cyberjack_port_probe,
a9556040 JH	78	.port_remove = cyberjack_port_remove,
1da177e4 LT	79	.open = cyberjack_open,
	80	.close = cyberjack_close,
	81	.write = cyberjack_write,
d9b1b787	82	.write_room = cyberjack_write_room,
1da177e4 LT	83	.read_int_callback = cyberjack_read_int_callback,
	84	.read_bulk_callback = cyberjack_read_bulk_callback,
	85	.write_bulk_callback = cyberjack_write_bulk_callback,
	86	};
	87
08a4f6bc AS	88	static struct usb_serial_driver * const serial_drivers[] = {
	89	&cyberjack_device, NULL
	90	};
	91
1da177e4 LT	92	struct cyberjack_private {
	93	spinlock_t lock; /* Lock for SMP */
	94	short rdtodo; /* Bytes still to read */
	95	unsigned char wrbuf[564]; / Buffer for collecting data to write */
	96	short wrfilled; /* Overall data size we already got */
	97	short wrsent; /* Data already sent */
	98	};
	99
a9556040	100	static int cyberjack_port_probe(struct usb_serial_port *port)
1da177e4 LT	101	{
1da177e4 LT	102	struct cyberjack_private *priv;
a9556040	103	int result;
1da177e4	104
1da177e4 LT	105	priv = kmalloc(sizeof(struct cyberjack_private), GFP_KERNEL);
	106	if (!priv)
	107	return -ENOMEM;
	108
1da177e4 LT	109	spin_lock_init(&priv->lock);
	110	priv->rdtodo = 0;
	111	priv->wrfilled = 0;
	112	priv->wrsent = 0;
a9556040 JH	113
	114	usb_set_serial_port_data(port, priv);
	115
	116	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
	117	if (result)
	118	dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
1da177e4	119
b9c52f15	120	return 0;
1da177e4 LT	121	}
1da177e4 LT	122
a9556040	123	static int cyberjack_port_remove(struct usb_serial_port *port)
1da177e4	124	{
a9556040	125	struct cyberjack_private *priv;
b9c52f15	126
30d9d42e JH	127	usb_kill_urb(port->interrupt_in_urb);
30d9d42e JH	128
a9556040 JH	129	priv = usb_get_serial_port_data(port);
	130	kfree(priv);
	131
	132	return 0;
f9c99bb8 AS	133	}
f9c99bb8 AS	134
95da310e	135	static int cyberjack_open(struct tty_struct *tty,
a509a7e4	136	struct usb_serial_port *port)
1da177e4 LT	137	{
	138	struct cyberjack_private *priv;
	139	unsigned long flags;
1da177e4	140
96fc8e8d	141	dev_dbg(&port->dev, "%s - usb_clear_halt\n", __func__);
1da177e4 LT	142	usb_clear_halt(port->serial->dev, port->write_urb->pipe);
1da177e4 LT	143
1da177e4 LT	144	priv = usb_get_serial_port_data(port);
	145	spin_lock_irqsave(&priv->lock, flags);
	146	priv->rdtodo = 0;
	147	priv->wrfilled = 0;
	148	priv->wrsent = 0;
	149	spin_unlock_irqrestore(&priv->lock, flags);
	150
0f3083af	151	return 0;
1da177e4 LT	152	}
1da177e4 LT	153
335f8514	154	static void cyberjack_close(struct usb_serial_port *port)
1da177e4	155	{
1bc77f4d JH	156	usb_kill_urb(port->write_urb);
1bc77f4d JH	157	usb_kill_urb(port->read_urb);
1da177e4 LT	158	}
1da177e4 LT	159
95da310e AC	160	static int cyberjack_write(struct tty_struct *tty,
95da310e AC	161	struct usb_serial_port port, const unsigned char buf, int count)
1da177e4	162	{
96fc8e8d	163	struct device *dev = &port->dev;
1da177e4 LT	164	struct cyberjack_private *priv = usb_get_serial_port_data(port);
	165	unsigned long flags;
	166	int result;
	167	int wrexpected;
	168
1da177e4	169	if (count == 0) {
96fc8e8d	170	dev_dbg(dev, "%s - write request of 0 bytes\n", __func__);
a5b6f60c	171	return 0;
1da177e4 LT	172	}
1da177e4 LT	173
c1cac10c	174	if (!test_and_clear_bit(0, &port->write_urbs_free)) {
96fc8e8d	175	dev_dbg(dev, "%s - already writing\n", __func__);
507ca9bc	176	return 0;
1da177e4 LT	177	}
	178
	179	spin_lock_irqsave(&priv->lock, flags);
	180
b9c52f15	181	if (count+priv->wrfilled > sizeof(priv->wrbuf)) {
1da177e4	182	/* To much data for buffer. Reset buffer. */
a5b6f60c	183	priv->wrfilled = 0;
a5b6f60c	184	spin_unlock_irqrestore(&priv->lock, flags);
c1cac10c	185	set_bit(0, &port->write_urbs_free);
a5b6f60c	186	return 0;
1da177e4 LT	187	}
	188
	189	/* Copy data */
b9c52f15	190	memcpy(priv->wrbuf + priv->wrfilled, buf, count);
1da177e4	191
59d33f2f	192	usb_serial_debug_data(dev, __func__, count, priv->wrbuf + priv->wrfilled);
1da177e4 LT	193	priv->wrfilled += count;
1da177e4 LT	194
b9c52f15	195	if (priv->wrfilled >= 3) {
1da177e4	196	wrexpected = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
96fc8e8d	197	dev_dbg(dev, "%s - expected data: %d\n", __func__, wrexpected);
b9c52f15	198	} else
1da177e4	199	wrexpected = sizeof(priv->wrbuf);
1da177e4	200
b9c52f15	201	if (priv->wrfilled >= wrexpected) {
1da177e4 LT	202	/* We have enough data to begin transmission */
	203	int length;
	204
96fc8e8d	205	dev_dbg(dev, "%s - transmitting data (frame 1)\n", __func__);
b9c52f15 AC	206	length = (wrexpected > port->bulk_out_size) ?
b9c52f15 AC	207	port->bulk_out_size : wrexpected;
1da177e4	208
b9c52f15 AC	209	memcpy(port->write_urb->transfer_buffer, priv->wrbuf, length);
b9c52f15 AC	210	priv->wrsent = length;
1da177e4 LT	211
1da177e4 LT	212	/* set up our urb */
fd11961a	213	port->write_urb->transfer_buffer_length = length;
1da177e4 LT	214
	215	/* send the data out the bulk port */
	216	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
	217	if (result) {
194343d9	218	dev_err(&port->dev,
d9a38a87	219	"%s - failed submitting write urb, error %d\n",
194343d9	220	__func__, result);
1da177e4	221	/* Throw away data. No better idea what to do with it. */
a5b6f60c AC	222	priv->wrfilled = 0;
a5b6f60c AC	223	priv->wrsent = 0;
1da177e4	224	spin_unlock_irqrestore(&priv->lock, flags);
c1cac10c	225	set_bit(0, &port->write_urbs_free);
1da177e4 LT	226	return 0;
	227	}
	228
96fc8e8d GKH	229	dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
96fc8e8d GKH	230	dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);
1da177e4	231
b9c52f15	232	if (priv->wrsent >= priv->wrfilled) {
96fc8e8d	233	dev_dbg(dev, "%s - buffer cleaned\n", __func__);
b9c52f15	234	memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
a5b6f60c AC	235	priv->wrfilled = 0;
a5b6f60c AC	236	priv->wrsent = 0;
1da177e4 LT	237	}
	238	}
	239
	240	spin_unlock_irqrestore(&priv->lock, flags);
	241
b9c52f15 AC	242	return count;
b9c52f15 AC	243	}
1da177e4	244
95da310e	245	static int cyberjack_write_room(struct tty_struct *tty)
1da177e4	246	{
a5b6f60c	247	/* FIXME: .... */
1da177e4 LT	248	return CYBERJACK_LOCAL_BUF_SIZE;
	249	}
	250
95da310e	251	static void cyberjack_read_int_callback(struct urb *urb)
1da177e4	252	{
cdc97792	253	struct usb_serial_port *port = urb->context;
1da177e4	254	struct cyberjack_private *priv = usb_get_serial_port_data(port);
96fc8e8d	255	struct device *dev = &port->dev;
1da177e4	256	unsigned char *data = urb->transfer_buffer;
7dcc85cd	257	int status = urb->status;
1da177e4 LT	258	int result;
1da177e4 LT	259
1da177e4	260	/* the urb might have been killed. */
7dcc85cd	261	if (status)
1da177e4 LT	262	return;
1da177e4 LT	263
59d33f2f	264	usb_serial_debug_data(dev, __func__, urb->actual_length, data);
1da177e4 LT	265
1da177e4 LT	266	/* React only to interrupts signaling a bulk_in transfer */
b9c52f15	267	if (urb->actual_length == 4 && data[0] == 0x01) {
1da177e4	268	short old_rdtodo;
1da177e4 LT	269
	270	/* This is a announcement of coming bulk_ins. */
	271	unsigned short size = ((unsigned short)data[3]<<8)+data[2]+3;
	272
	273	spin_lock(&priv->lock);
	274
	275	old_rdtodo = priv->rdtodo;
	276
5287bf72	277	if (old_rdtodo > SHRT_MAX - size) {
96fc8e8d	278	dev_dbg(dev, "To many bulk_in urbs to do.\n");
1da177e4 LT	279	spin_unlock(&priv->lock);
	280	goto resubmit;
	281	}
	282
cd8c5053	283	/* "+=" is probably more fault tolerant than "=" */
1da177e4 LT	284	priv->rdtodo += size;
1da177e4 LT	285
96fc8e8d	286	dev_dbg(dev, "%s - rdtodo: %d\n", __func__, priv->rdtodo);
1da177e4 LT	287
	288	spin_unlock(&priv->lock);
	289
b9c52f15	290	if (!old_rdtodo) {
1da177e4	291	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
b9c52f15	292	if (result)
96fc8e8d	293	dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
194343d9	294	__func__, result);
96fc8e8d	295	dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
1da177e4 LT	296	}
	297	}
	298
	299	resubmit:
1da177e4 LT	300	result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1da177e4 LT	301	if (result)
194343d9	302	dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
96fc8e8d	303	dev_dbg(dev, "%s - usb_submit_urb(int urb)\n", __func__);
1da177e4 LT	304	}
1da177e4 LT	305
95da310e	306	static void cyberjack_read_bulk_callback(struct urb *urb)
1da177e4	307	{
cdc97792	308	struct usb_serial_port *port = urb->context;
1da177e4	309	struct cyberjack_private *priv = usb_get_serial_port_data(port);
96fc8e8d	310	struct device *dev = &port->dev;
1da177e4 LT	311	unsigned char *data = urb->transfer_buffer;
1da177e4 LT	312	short todo;
1da177e4	313	int result;
7dcc85cd	314	int status = urb->status;
1da177e4	315
59d33f2f	316	usb_serial_debug_data(dev, __func__, urb->actual_length, data);
7dcc85cd	317	if (status) {
96fc8e8d GKH	318	dev_dbg(dev, "%s - nonzero read bulk status received: %d\n",
96fc8e8d GKH	319	__func__, status);
1da177e4 LT	320	return;
	321	}
	322
1da177e4	323	if (urb->actual_length) {
05c7cd39	324	tty_insert_flip_string(&port->port, data, urb->actual_length);
2e124b4a	325	tty_flip_buffer_push(&port->port);
1da177e4 LT	326	}
	327
	328	spin_lock(&priv->lock);
	329
	330	/* Reduce urbs to do by one. */
b9c52f15	331	priv->rdtodo -= urb->actual_length;
1da177e4	332	/* Just to be sure */
b9c52f15 AC	333	if (priv->rdtodo < 0)
b9c52f15 AC	334	priv->rdtodo = 0;
1da177e4 LT	335	todo = priv->rdtodo;
	336
	337	spin_unlock(&priv->lock);
	338
96fc8e8d	339	dev_dbg(dev, "%s - rdtodo: %d\n", __func__, todo);
1da177e4 LT	340
1da177e4 LT	341	/* Continue to read if we have still urbs to do. */
b9c52f15	342	if (todo /* \|\| (urb->actual_length==port->bulk_in_endpointAddress)*/) {
1da177e4 LT	343	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1da177e4 LT	344	if (result)
96fc8e8d GKH	345	dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
	346	__func__, result);
	347	dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
1da177e4 LT	348	}
	349	}
	350
95da310e	351	static void cyberjack_write_bulk_callback(struct urb *urb)
1da177e4	352	{
cdc97792	353	struct usb_serial_port *port = urb->context;
1da177e4	354	struct cyberjack_private *priv = usb_get_serial_port_data(port);
96fc8e8d	355	struct device *dev = &port->dev;
7dcc85cd	356	int status = urb->status;
1da177e4	357
c1cac10c	358	set_bit(0, &port->write_urbs_free);
7dcc85cd	359	if (status) {
96fc8e8d GKH	360	dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
96fc8e8d GKH	361	__func__, status);
1da177e4 LT	362	return;
	363	}
	364
	365	spin_lock(&priv->lock);
	366
	367	/* only do something if we have more data to send */
b9c52f15	368	if (priv->wrfilled) {
1da177e4 LT	369	int length, blksize, result;
1da177e4 LT	370
96fc8e8d	371	dev_dbg(dev, "%s - transmitting data (frame n)\n", __func__);
1da177e4 LT	372
	373	length = ((priv->wrfilled - priv->wrsent) > port->bulk_out_size) ?
	374	port->bulk_out_size : (priv->wrfilled - priv->wrsent);
	375
b9c52f15 AC	376	memcpy(port->write_urb->transfer_buffer,
	377	priv->wrbuf + priv->wrsent, length);
	378	priv->wrsent += length;
1da177e4 LT	379
1da177e4 LT	380	/* set up our urb */
fd11961a	381	port->write_urb->transfer_buffer_length = length;
1da177e4 LT	382
	383	/* send the data out the bulk port */
	384	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
	385	if (result) {
96fc8e8d	386	dev_err(dev, "%s - failed submitting write urb, error %d\n",
194343d9	387	__func__, result);
1da177e4	388	/* Throw away data. No better idea what to do with it. */
a5b6f60c AC	389	priv->wrfilled = 0;
a5b6f60c AC	390	priv->wrsent = 0;
1da177e4 LT	391	goto exit;
	392	}
	393
96fc8e8d GKH	394	dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
96fc8e8d GKH	395	dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);
1da177e4 LT	396
	397	blksize = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
	398
b9c52f15 AC	399	if (priv->wrsent >= priv->wrfilled \|\|
b9c52f15 AC	400	priv->wrsent >= blksize) {
96fc8e8d	401	dev_dbg(dev, "%s - buffer cleaned\n", __func__);
b9c52f15	402	memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
a5b6f60c AC	403	priv->wrfilled = 0;
a5b6f60c AC	404	priv->wrsent = 0;
1da177e4 LT	405	}
	406	}
	407
	408	exit:
	409	spin_unlock(&priv->lock);
cf2c7481	410	usb_serial_port_softint(port);
1da177e4 LT	411	}
1da177e4 LT	412
68e24113	413	module_usb_serial_driver(serial_drivers, id_table);
1da177e4	414
b9c52f15 AC	415	MODULE_AUTHOR(DRIVER_AUTHOR);
b9c52f15 AC	416	MODULE_DESCRIPTION(DRIVER_DESC);
1da177e4	417	MODULE_LICENSE("GPL");