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

/*
 * USB ZyXEL omni.net LCD PLUS driver
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License version
 *	2 as published by the Free Software Foundation.
 *
 * See Documentation/usb/usb-serial.txt for more information on using this
 * driver
 *
 * Please report both successes and troubles to the author at omninet@kroah.com
 *
 * (05/30/2001) gkh
 *	switched from using spinlock to a semaphore, which fixes lots of
 *	problems.
 *
 * (04/08/2001) gb
 *	Identify version on module load.
 *
 * (11/01/2000) Adam J. Richter
 *	usb_device_id table support
 *
 * (10/05/2000) gkh
 *	Fixed bug with urb->dev not being set properly, now that the usb
 *	core needs it.
 *
 * (08/28/2000) gkh
 *	Added locks for SMP safeness.
 *	Fixed MOD_INC and MOD_DEC logic and the ability to open a port more
 *	than once.
 *	Fixed potential race in omninet_write_bulk_callback
 *
 * (07/19/2000) gkh
 *	Added module_init and module_exit functions to handle the fact that this
 *	driver is a loadable module now.
 *
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.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>

static int debug;

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.1"
#define DRIVER_AUTHOR "Alessandro Zummo"
#define DRIVER_DESC "USB ZyXEL omni.net LCD PLUS Driver"

#define ZYXEL_VENDOR_ID		0x0586
#define ZYXEL_OMNINET_ID	0x1000
/* This one seems to be a re-branded ZyXEL device */
#define BT_IGNITIONPRO_ID	0x2000

/* function prototypes */
static int  omninet_open(struct tty_struct *tty, struct usb_serial_port *port);
static void omninet_close(struct usb_serial_port *port);
static void omninet_read_bulk_callback(struct urb *urb);
static void omninet_write_bulk_callback(struct urb *urb);
static int  omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
				const unsigned char *buf, int count);
static int  omninet_write_room(struct tty_struct *tty);
static void omninet_disconnect(struct usb_serial *serial);
static void omninet_release(struct usb_serial *serial);
static int omninet_attach(struct usb_serial *serial);

static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
	{ USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) },
	{ }						/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, id_table);

static struct usb_driver omninet_driver = {
	.name =		"omninet",
	.probe =	usb_serial_probe,
	.disconnect =	usb_serial_disconnect,
	.id_table =	id_table,
	.no_dynamic_id = 	1,
};


static struct usb_serial_driver zyxel_omninet_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"omninet",
	},
	.description =		"ZyXEL - omni.net lcd plus usb",
	.usb_driver =		&omninet_driver,
	.id_table =		id_table,
	.num_ports =		1,
	.attach =		omninet_attach,
	.open =			omninet_open,
	.close =		omninet_close,
	.write =		omninet_write,
	.write_room =		omninet_write_room,
	.read_bulk_callback =	omninet_read_bulk_callback,
	.write_bulk_callback =	omninet_write_bulk_callback,
	.disconnect =		omninet_disconnect,
	.release =		omninet_release,
};


/* The protocol.
 *
 * The omni.net always exchange 64 bytes of data with the host. The first
 * four bytes are the control header, you can see it in the above structure.
 *
 * oh_seq is a sequence number. Don't know if/how it's used.
 * oh_len is the length of the data bytes in the packet.
 * oh_xxx Bit-mapped, related to handshaking and status info.
 *	I normally set it to 0x03 in trasmitted frames.
 *	7: Active when the TA is in a CONNECTed state.
 *	6: unknown
 *	5: handshaking, unknown
 *	4: handshaking, unknown
 *	3: unknown, usually 0
 *	2: unknown, usually 0
 *	1: handshaking, unknown, usually set to 1 in trasmitted frames
 *	0: handshaking, unknown, usually set to 1 in trasmitted frames
 * oh_pad Probably a pad byte.
 *
 * After the header you will find data bytes if oh_len was greater than zero.
 *
 */

struct omninet_header {
	__u8	oh_seq;
	__u8	oh_len;
	__u8	oh_xxx;
	__u8	oh_pad;
};

struct omninet_data {
	__u8	od_outseq;	/* Sequence number for bulk_out URBs */
};

static int omninet_attach(struct usb_serial *serial)
{
	struct omninet_data *od;
	struct usb_serial_port *port = serial->port[0];

	od = kmalloc(sizeof(struct omninet_data), GFP_KERNEL);
	if (!od) {
		dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n",
			__func__, sizeof(struct omninet_data));
		return -ENOMEM;
	}
	usb_set_serial_port_data(port, od);
	return 0;
}

static int omninet_open(struct tty_struct *tty, struct usb_serial_port *port)
{
	struct usb_serial	*serial = port->serial;
	struct usb_serial_port	*wport;
	int			result = 0;

	dbg("%s - port %d", __func__, port->number);

	wport = serial->port[1];
	tty_port_tty_set(&wport->port, tty);

	/* Start reading from the device */
	usb_fill_bulk_urb(port->read_urb, serial->dev,
			usb_rcvbulkpipe(serial->dev,
				port->bulk_in_endpointAddress),
			port->read_urb->transfer_buffer,
			port->read_urb->transfer_buffer_length,
			omninet_read_bulk_callback, port);
	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
	if (result)
		dev_err(&port->dev,
			"%s - failed submitting read urb, error %d\n",
			__func__, result);
	return result;
}

static void omninet_close(struct usb_serial_port *port)
{
	dbg("%s - port %d", __func__, port->number);
	usb_kill_urb(port->read_urb);
}


#define OMNINET_DATAOFFSET	0x04
#define OMNINET_HEADERLEN	sizeof(struct omninet_header)
#define OMNINET_BULKOUTSIZE 	(64 - OMNINET_HEADERLEN)

static void omninet_read_bulk_callback(struct urb *urb)
{
	struct usb_serial_port 	*port 	= urb->context;
	unsigned char 		*data 	= urb->transfer_buffer;
	struct omninet_header 	*header = (struct omninet_header *) &data[0];
	int status = urb->status;
	int result;
	int i;

	dbg("%s - port %d", __func__, port->number);

	if (status) {
		dbg("%s - nonzero read bulk status received: %d",
		    __func__, status);
		return;
	}

	if (debug && header->oh_xxx != 0x30) {
		if (urb->actual_length) {
			printk(KERN_DEBUG "%s: omninet_read %d: ",
			       __FILE__, header->oh_len);
			for (i = 0; i < (header->oh_len +
						OMNINET_HEADERLEN); i++)
				printk("%.2x ", data[i]);
			printk("\n");
		}
	}

	if (urb->actual_length && header->oh_len) {
		struct tty_struct *tty = tty_port_tty_get(&port->port);
		tty_insert_flip_string(tty, data + OMNINET_DATAOFFSET,
							header->oh_len);
		tty_flip_buffer_push(tty);
		tty_kref_put(tty);
	}

	/* Continue trying to always read  */
	usb_fill_bulk_urb(urb, port->serial->dev,
			usb_rcvbulkpipe(port->serial->dev,
					port->bulk_in_endpointAddress),
			urb->transfer_buffer, urb->transfer_buffer_length,
			omninet_read_bulk_callback, port);
	result = usb_submit_urb(urb, GFP_ATOMIC);
	if (result)
		dev_err(&port->dev,
			"%s - failed resubmitting read urb, error %d\n",
			__func__, result);
}

static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
					const unsigned char *buf, int count)
{
	struct usb_serial *serial = port->serial;
	struct usb_serial_port *wport = serial->port[1];

	struct omninet_data *od = usb_get_serial_port_data(port);
	struct omninet_header *header = (struct omninet_header *)
					wport->write_urb->transfer_buffer;

	int			result;

	dbg("%s - port %d", __func__, port->number);

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

	spin_lock_bh(&wport->lock);
	if (wport->write_urb_busy) {
		spin_unlock_bh(&wport->lock);
		dbg("%s - already writing", __func__);
		return 0;
	}
	wport->write_urb_busy = 1;
	spin_unlock_bh(&wport->lock);

	count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count;

	memcpy(wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET,
								buf, count);

	usb_serial_debug_data(debug, &port->dev, __func__, count,
					wport->write_urb->transfer_buffer);

	header->oh_seq 	= od->od_outseq++;
	header->oh_len 	= count;
	header->oh_xxx  = 0x03;
	header->oh_pad 	= 0x00;

	/* send the data out the bulk port, always 64 bytes */
	wport->write_urb->transfer_buffer_length = 64;

	wport->write_urb->dev = serial->dev;
	result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
	if (result) {
		wport->write_urb_busy = 0;
		dev_err(&port->dev,
			"%s - failed submitting write urb, error %d\n",
			__func__, result);
	} else
		result = count;

	return result;
}


static int omninet_write_room(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct usb_serial 	*serial = port->serial;
	struct usb_serial_port 	*wport 	= serial->port[1];

	int room = 0; /* Default: no room */

	/* FIXME: no consistent locking for write_urb_busy */
	if (wport->write_urb_busy)
		room = wport->bulk_out_size - OMNINET_HEADERLEN;

	dbg("%s - returns %d", __func__, room);

	return room;
}

static void omninet_write_bulk_callback(struct urb *urb)
{
/*	struct omninet_header	*header = (struct omninet_header  *)
						urb->transfer_buffer; */
	struct usb_serial_port 	*port   =  urb->context;
	int status = urb->status;

	dbg("%s - port %0x", __func__, port->number);

	port->write_urb_busy = 0;
	if (status) {
		dbg("%s - nonzero write bulk status received: %d",
		    __func__, status);
		return;
	}

	usb_serial_port_softint(port);
}


static void omninet_disconnect(struct usb_serial *serial)
{
	struct usb_serial_port *wport = serial->port[1];

	dbg("%s", __func__);

	usb_kill_urb(wport->write_urb);
}


static void omninet_release(struct usb_serial *serial)
{
	struct usb_serial_port *port = serial->port[0];

	dbg("%s", __func__);

	kfree(usb_get_serial_port_data(port));
}


static int __init omninet_init(void)
{
	int retval;
	retval = usb_serial_register(&zyxel_omninet_device);
	if (retval)
		goto failed_usb_serial_register;
	retval = usb_register(&omninet_driver);
	if (retval)
		goto failed_usb_register;
	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
	       DRIVER_DESC "\n");
	return 0;
failed_usb_register:
	usb_serial_deregister(&zyxel_omninet_device);
failed_usb_serial_register:
	return retval;
}


static void __exit omninet_exit(void)
{
	usb_deregister(&omninet_driver);
	usb_serial_deregister(&zyxel_omninet_device);
}


module_init(omninet_init);
module_exit(omninet_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* USB ZyXEL omni.net LCD PLUS driver
	3	*
4d0dce3e GKH	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License version
	6	* 2 as published by the Free Software Foundation.
1da177e4	7	*
f89d0dff AC	8	* See Documentation/usb/usb-serial.txt for more information on using this
f89d0dff AC	9	* driver
1da177e4 LT	10	*
1da177e4 LT	11	* Please report both successes and troubles to the author at omninet@kroah.com
f89d0dff	12	*
1da177e4	13	* (05/30/2001) gkh
f89d0dff AC	14	* switched from using spinlock to a semaphore, which fixes lots of
f89d0dff AC	15	* problems.
1da177e4 LT	16	*
	17	* (04/08/2001) gb
	18	* Identify version on module load.
	19	*
	20	* (11/01/2000) Adam J. Richter
	21	* usb_device_id table support
f89d0dff	22	*
1da177e4 LT	23	* (10/05/2000) gkh
	24	* Fixed bug with urb->dev not being set properly, now that the usb
	25	* core needs it.
f89d0dff	26	*
1da177e4 LT	27	* (08/28/2000) gkh
1da177e4 LT	28	* Added locks for SMP safeness.
f89d0dff	29	* Fixed MOD_INC and MOD_DEC logic and the ability to open a port more
1da177e4 LT	30	* than once.
	31	* Fixed potential race in omninet_write_bulk_callback
	32	*
	33	* (07/19/2000) gkh
	34	* Added module_init and module_exit functions to handle the fact that this
	35	* driver is a loadable module now.
	36	*
	37	*/
	38
1da177e4 LT	39	#include <linux/kernel.h>
	40	#include <linux/errno.h>
	41	#include <linux/init.h>
	42	#include <linux/slab.h>
	43	#include <linux/tty.h>
	44	#include <linux/tty_driver.h>
	45	#include <linux/tty_flip.h>
	46	#include <linux/module.h>
	47	#include <linux/spinlock.h>
f89d0dff	48	#include <linux/uaccess.h>
1da177e4	49	#include <linux/usb.h>
a969888c	50	#include <linux/usb/serial.h>
1da177e4 LT	51
	52	static int debug;
	53
	54	/*
	55	* Version Information
	56	*/
	57	#define DRIVER_VERSION "v1.1"
	58	#define DRIVER_AUTHOR "Alessandro Zummo"
	59	#define DRIVER_DESC "USB ZyXEL omni.net LCD PLUS Driver"
	60
	61	#define ZYXEL_VENDOR_ID 0x0586
	62	#define ZYXEL_OMNINET_ID 0x1000
f89d0dff AC	63	/* This one seems to be a re-branded ZyXEL device */
f89d0dff AC	64	#define BT_IGNITIONPRO_ID 0x2000
1da177e4 LT	65
1da177e4 LT	66	/* function prototypes */
a509a7e4	67	static int omninet_open(struct tty_struct tty, struct usb_serial_port port);
335f8514	68	static void omninet_close(struct usb_serial_port *port);
f89d0dff AC	69	static void omninet_read_bulk_callback(struct urb *urb);
	70	static void omninet_write_bulk_callback(struct urb *urb);
	71	static int omninet_write(struct tty_struct tty, struct usb_serial_port port,
	72	const unsigned char *buf, int count);
	73	static int omninet_write_room(struct tty_struct *tty);
f9c99bb8 AS	74	static void omninet_disconnect(struct usb_serial *serial);
f9c99bb8 AS	75	static void omninet_release(struct usb_serial *serial);
f89d0dff AC	76	static int omninet_attach(struct usb_serial *serial);
f89d0dff AC	77
7d40d7e8	78	static const struct usb_device_id id_table[] = {
1da177e4 LT	79	{ USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
	80	{ USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) },
	81	{ } /* Terminating entry */
	82	};
	83
f89d0dff	84	MODULE_DEVICE_TABLE(usb, id_table);
1da177e4 LT	85
1da177e4 LT	86	static struct usb_driver omninet_driver = {
1da177e4 LT	87	.name = "omninet",
	88	.probe = usb_serial_probe,
	89	.disconnect = usb_serial_disconnect,
	90	.id_table = id_table,
ba9dc657	91	.no_dynamic_id = 1,
1da177e4 LT	92	};
	93
	94
ea65370d	95	static struct usb_serial_driver zyxel_omninet_device = {
18fcac35 GKH	96	.driver = {
18fcac35 GKH	97	.owner = THIS_MODULE,
269bda1c	98	.name = "omninet",
18fcac35	99	},
269bda1c	100	.description = "ZyXEL - omni.net lcd plus usb",
d9b1b787	101	.usb_driver = &omninet_driver,
1da177e4	102	.id_table = id_table,
1da177e4	103	.num_ports = 1,
5ec1862e	104	.attach = omninet_attach,
1da177e4 LT	105	.open = omninet_open,
	106	.close = omninet_close,
	107	.write = omninet_write,
	108	.write_room = omninet_write_room,
	109	.read_bulk_callback = omninet_read_bulk_callback,
	110	.write_bulk_callback = omninet_write_bulk_callback,
f9c99bb8 AS	111	.disconnect = omninet_disconnect,
f9c99bb8 AS	112	.release = omninet_release,
1da177e4 LT	113	};
	114
	115
	116	/* The protocol.
	117	*
	118	* The omni.net always exchange 64 bytes of data with the host. The first
	119	* four bytes are the control header, you can see it in the above structure.
	120	*
	121	* oh_seq is a sequence number. Don't know if/how it's used.
	122	* oh_len is the length of the data bytes in the packet.
	123	* oh_xxx Bit-mapped, related to handshaking and status info.
	124	* I normally set it to 0x03 in trasmitted frames.
	125	* 7: Active when the TA is in a CONNECTed state.
	126	* 6: unknown
	127	* 5: handshaking, unknown
	128	* 4: handshaking, unknown
	129	* 3: unknown, usually 0
	130	* 2: unknown, usually 0
	131	* 1: handshaking, unknown, usually set to 1 in trasmitted frames
	132	* 0: handshaking, unknown, usually set to 1 in trasmitted frames
	133	* oh_pad Probably a pad byte.
	134	*
	135	* After the header you will find data bytes if oh_len was greater than zero.
	136	*
	137	*/
	138
f89d0dff	139	struct omninet_header {
1da177e4 LT	140	__u8 oh_seq;
	141	__u8 oh_len;
	142	__u8 oh_xxx;
	143	__u8 oh_pad;
	144	};
	145
f89d0dff AC	146	struct omninet_data {
f89d0dff AC	147	__u8 od_outseq; /* Sequence number for bulk_out URBs */
1da177e4 LT	148	};
1da177e4 LT	149
f89d0dff	150	static int omninet_attach(struct usb_serial *serial)
5ec1862e ON	151	{
	152	struct omninet_data *od;
	153	struct usb_serial_port *port = serial->port[0];
	154
f89d0dff AC	155	od = kmalloc(sizeof(struct omninet_data), GFP_KERNEL);
f89d0dff AC	156	if (!od) {
194343d9 GKH	157	dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n",
194343d9 GKH	158	__func__, sizeof(struct omninet_data));
5ec1862e ON	159	return -ENOMEM;
	160	}
	161	usb_set_serial_port_data(port, od);
	162	return 0;
	163	}
	164
a509a7e4	165	static int omninet_open(struct tty_struct tty, struct usb_serial_port port)
1da177e4 LT	166	{
	167	struct usb_serial *serial = port->serial;
	168	struct usb_serial_port *wport;
1da177e4 LT	169	int result = 0;
1da177e4 LT	170
441b62c1	171	dbg("%s - port %d", __func__, port->number);
1da177e4	172
1da177e4	173	wport = serial->port[1];
4a90f09b	174	tty_port_tty_set(&wport->port, tty);
1da177e4 LT	175
1da177e4 LT	176	/* Start reading from the device */
f89d0dff AC	177	usb_fill_bulk_urb(port->read_urb, serial->dev,
	178	usb_rcvbulkpipe(serial->dev,
	179	port->bulk_in_endpointAddress),
	180	port->read_urb->transfer_buffer,
	181	port->read_urb->transfer_buffer_length,
	182	omninet_read_bulk_callback, port);
1da177e4	183	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
f89d0dff	184	if (result)
194343d9 GKH	185	dev_err(&port->dev,
	186	"%s - failed submitting read urb, error %d\n",
	187	__func__, result);
1da177e4 LT	188	return result;
	189	}
	190
335f8514	191	static void omninet_close(struct usb_serial_port *port)
1da177e4	192	{
441b62c1	193	dbg("%s - port %d", __func__, port->number);
1da177e4	194	usb_kill_urb(port->read_urb);
1da177e4 LT	195	}
	196
	197
	198	#define OMNINET_DATAOFFSET 0x04
	199	#define OMNINET_HEADERLEN sizeof(struct omninet_header)
	200	#define OMNINET_BULKOUTSIZE (64 - OMNINET_HEADERLEN)
	201
f89d0dff	202	static void omninet_read_bulk_callback(struct urb *urb)
1da177e4	203	{
cdc97792	204	struct usb_serial_port *port = urb->context;
1da177e4 LT	205	unsigned char *data = urb->transfer_buffer;
1da177e4 LT	206	struct omninet_header header = (struct omninet_header ) &data[0];
fdc2deb3	207	int status = urb->status;
1da177e4	208	int result;
4944d400	209	int i;
1da177e4	210
441b62c1	211	dbg("%s - port %d", __func__, port->number);
1da177e4	212
fdc2deb3 GKH	213	if (status) {
fdc2deb3 GKH	214	dbg("%s - nonzero read bulk status received: %d",
441b62c1	215	__func__, status);
1da177e4 LT	216	return;
	217	}
	218
f89d0dff	219	if (debug && header->oh_xxx != 0x30) {
1da177e4	220	if (urb->actual_length) {
f45ba776 JP	221	printk(KERN_DEBUG "%s: omninet_read %d: ",
f45ba776 JP	222	__FILE__, header->oh_len);
f89d0dff AC	223	for (i = 0; i < (header->oh_len +
	224	OMNINET_HEADERLEN); i++)
	225	printk("%.2x ", data[i]);
	226	printk("\n");
1da177e4 LT	227	}
	228	}
	229
	230	if (urb->actual_length && header->oh_len) {
4a90f09b AC	231	struct tty_struct *tty = tty_port_tty_get(&port->port);
	232	tty_insert_flip_string(tty, data + OMNINET_DATAOFFSET,
	233	header->oh_len);
	234	tty_flip_buffer_push(tty);
	235	tty_kref_put(tty);
1da177e4 LT	236	}
	237
	238	/* Continue trying to always read */
f89d0dff AC	239	usb_fill_bulk_urb(urb, port->serial->dev,
	240	usb_rcvbulkpipe(port->serial->dev,
	241	port->bulk_in_endpointAddress),
	242	urb->transfer_buffer, urb->transfer_buffer_length,
	243	omninet_read_bulk_callback, port);
1da177e4 LT	244	result = usb_submit_urb(urb, GFP_ATOMIC);
1da177e4 LT	245	if (result)
194343d9 GKH	246	dev_err(&port->dev,
	247	"%s - failed resubmitting read urb, error %d\n",
	248	__func__, result);
1da177e4 LT	249	}
1da177e4 LT	250
95da310e AC	251	static int omninet_write(struct tty_struct tty, struct usb_serial_port port,
95da310e AC	252	const unsigned char *buf, int count)
1da177e4	253	{
f89d0dff AC	254	struct usb_serial *serial = port->serial;
f89d0dff AC	255	struct usb_serial_port *wport = serial->port[1];
1da177e4	256
f89d0dff AC	257	struct omninet_data *od = usb_get_serial_port_data(port);
	258	struct omninet_header header = (struct omninet_header )
	259	wport->write_urb->transfer_buffer;
1da177e4 LT	260
	261	int result;
	262
441b62c1	263	dbg("%s - port %d", __func__, port->number);
1da177e4 LT	264
1da177e4 LT	265	if (count == 0) {
441b62c1	266	dbg("%s - write request of 0 bytes", __func__);
f89d0dff	267	return 0;
1da177e4	268	}
507ca9bc	269
e81ee637	270	spin_lock_bh(&wport->lock);
df3fccb1	271	if (wport->write_urb_busy) {
e81ee637	272	spin_unlock_bh(&wport->lock);
441b62c1	273	dbg("%s - already writing", __func__);
507ca9bc	274	return 0;
1da177e4	275	}
df3fccb1	276	wport->write_urb_busy = 1;
e81ee637	277	spin_unlock_bh(&wport->lock);
1da177e4 LT	278
	279	count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count;
	280
f89d0dff AC	281	memcpy(wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET,
f89d0dff AC	282	buf, count);
1da177e4	283
f89d0dff AC	284	usb_serial_debug_data(debug, &port->dev, __func__, count,
f89d0dff AC	285	wport->write_urb->transfer_buffer);
1da177e4 LT	286
	287	header->oh_seq = od->od_outseq++;
	288	header->oh_len = count;
	289	header->oh_xxx = 0x03;
	290	header->oh_pad = 0x00;
	291
	292	/* send the data out the bulk port, always 64 bytes */
	293	wport->write_urb->transfer_buffer_length = 64;
	294
	295	wport->write_urb->dev = serial->dev;
	296	result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
507ca9bc	297	if (result) {
df3fccb1	298	wport->write_urb_busy = 0;
194343d9 GKH	299	dev_err(&port->dev,
	300	"%s - failed submitting write urb, error %d\n",
	301	__func__, result);
507ca9bc	302	} else
1da177e4 LT	303	result = count;
	304
	305	return result;
	306	}
	307
	308
f89d0dff	309	static int omninet_write_room(struct tty_struct *tty)
1da177e4	310	{
95da310e	311	struct usb_serial_port *port = tty->driver_data;
1da177e4 LT	312	struct usb_serial *serial = port->serial;
	313	struct usb_serial_port *wport = serial->port[1];
	314
a5b6f60c	315	int room = 0; /* Default: no room */
1da177e4	316
a5b6f60c	317	/* FIXME: no consistent locking for write_urb_busy */
507ca9bc	318	if (wport->write_urb_busy)
1da177e4 LT	319	room = wport->bulk_out_size - OMNINET_HEADERLEN;
1da177e4 LT	320
441b62c1	321	dbg("%s - returns %d", __func__, room);
1da177e4	322
f89d0dff	323	return room;
1da177e4 LT	324	}
1da177e4 LT	325
f89d0dff	326	static void omninet_write_bulk_callback(struct urb *urb)
1da177e4	327	{
f89d0dff AC	328	/* struct omninet_header header = (struct omninet_header )
f89d0dff AC	329	urb->transfer_buffer; */
cdc97792	330	struct usb_serial_port *port = urb->context;
fdc2deb3	331	int status = urb->status;
1da177e4	332
759f3634	333	dbg("%s - port %0x", __func__, port->number);
1da177e4	334
507ca9bc	335	port->write_urb_busy = 0;
fdc2deb3 GKH	336	if (status) {
fdc2deb3 GKH	337	dbg("%s - nonzero write bulk status received: %d",
441b62c1	338	__func__, status);
1da177e4 LT	339	return;
	340	}
	341
cf2c7481	342	usb_serial_port_softint(port);
1da177e4 LT	343	}
	344
	345
f9c99bb8	346	static void omninet_disconnect(struct usb_serial *serial)
1da177e4	347	{
5ec1862e	348	struct usb_serial_port *wport = serial->port[1];
f9c99bb8	349
f89d0dff	350	dbg("%s", __func__);
5ec1862e ON	351
5ec1862e ON	352	usb_kill_urb(wport->write_urb);
f9c99bb8 AS	353	}
	354
	355
	356	static void omninet_release(struct usb_serial *serial)
	357	{
	358	struct usb_serial_port *port = serial->port[0];
	359
	360	dbg("%s", __func__);
	361
5ec1862e	362	kfree(usb_get_serial_port_data(port));
1da177e4 LT	363	}
	364
	365
f89d0dff	366	static int __init omninet_init(void)
1da177e4 LT	367	{
	368	int retval;
	369	retval = usb_serial_register(&zyxel_omninet_device);
	370	if (retval)
	371	goto failed_usb_serial_register;
	372	retval = usb_register(&omninet_driver);
	373	if (retval)
	374	goto failed_usb_register;
c197a8db GKH	375	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
c197a8db GKH	376	DRIVER_DESC "\n");
1da177e4 LT	377	return 0;
	378	failed_usb_register:
	379	usb_serial_deregister(&zyxel_omninet_device);
	380	failed_usb_serial_register:
	381	return retval;
	382	}
	383
	384
f89d0dff	385	static void __exit omninet_exit(void)
1da177e4	386	{
f89d0dff AC	387	usb_deregister(&omninet_driver);
f89d0dff AC	388	usb_serial_deregister(&zyxel_omninet_device);
1da177e4 LT	389	}
	390
	391
	392	module_init(omninet_init);
	393	module_exit(omninet_exit);
	394
f89d0dff AC	395	MODULE_AUTHOR(DRIVER_AUTHOR);
f89d0dff AC	396	MODULE_DESCRIPTION(DRIVER_DESC);
1da177e4 LT	397	MODULE_LICENSE("GPL");
	398
	399	module_param(debug, bool, S_IRUGO \| S_IWUSR);
	400	MODULE_PARM_DESC(debug, "Debug enabled or not");