[linux-2.6-block.git] / drivers / usb / serial / generic.c

/*
 * USB Serial Converter Generic functions
 *
 * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
 *
 *	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.
 *
 */

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


static int debug;

#ifdef CONFIG_USB_SERIAL_GENERIC

static int generic_probe(struct usb_interface *interface,
			 const struct usb_device_id *id);

static __u16 vendor  = 0x05f9;
static __u16 product = 0xffff;

module_param(vendor, ushort, 0);
MODULE_PARM_DESC(vendor, "User specified USB idVendor");

module_param(product, ushort, 0);
MODULE_PARM_DESC(product, "User specified USB idProduct");

static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */

/* we want to look at all devices, as the vendor/product id can change
 * depending on the command line argument */
static struct usb_device_id generic_serial_ids[] = {
	{.driver_info = 42},
	{}
};

static struct usb_driver generic_driver = {
	.name =		"usbserial_generic",
	.probe =	generic_probe,
	.disconnect =	usb_serial_disconnect,
	.id_table =	generic_serial_ids,
	.no_dynamic_id =	1,
};

/* All of the device info needed for the Generic Serial Converter */
struct usb_serial_driver usb_serial_generic_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"generic",
	},
	.id_table =		generic_device_ids,
	.usb_driver = 		&generic_driver,
	.num_interrupt_in =	NUM_DONT_CARE,
	.num_bulk_in =		NUM_DONT_CARE,
	.num_bulk_out =		NUM_DONT_CARE,
	.num_ports =		1,
	.shutdown =		usb_serial_generic_shutdown,
	.throttle =		usb_serial_generic_throttle,
	.unthrottle =		usb_serial_generic_unthrottle,
	.resume =		usb_serial_generic_resume,
};

static int generic_probe(struct usb_interface *interface,
			       const struct usb_device_id *id)
{
	const struct usb_device_id *id_pattern;

	id_pattern = usb_match_id(interface, generic_device_ids);
	if (id_pattern != NULL)
		return usb_serial_probe(interface, id);
	return -ENODEV;
}
#endif

int usb_serial_generic_register (int _debug)
{
	int retval = 0;

	debug = _debug;
#ifdef CONFIG_USB_SERIAL_GENERIC
	generic_device_ids[0].idVendor = vendor;
	generic_device_ids[0].idProduct = product;
	generic_device_ids[0].match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT;

	/* register our generic driver with ourselves */
	retval = usb_serial_register (&usb_serial_generic_device);
	if (retval)
		goto exit;
	retval = usb_register(&generic_driver);
	if (retval)
		usb_serial_deregister(&usb_serial_generic_device);
exit:
#endif
	return retval;
}

void usb_serial_generic_deregister (void)
{
#ifdef CONFIG_USB_SERIAL_GENERIC
	/* remove our generic driver */
	usb_deregister(&generic_driver);
	usb_serial_deregister (&usb_serial_generic_device);
#endif
}

int usb_serial_generic_open (struct usb_serial_port *port, struct file *filp)
{
	struct usb_serial *serial = port->serial;
	int result = 0;
	unsigned long flags;

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

	/* 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 (port->tty)
		port->tty->low_latency = 1;

	/* clear the throttle flags */
	spin_lock_irqsave(&port->lock, flags);
	port->throttled = 0;
	port->throttle_req = 0;
	spin_unlock_irqrestore(&port->lock, flags);

	/* if we have a bulk endpoint, start reading from it */
	if (serial->num_bulk_in) {
		/* 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,
				   ((serial->type->read_bulk_callback) ?
				     serial->type->read_bulk_callback :
				     usb_serial_generic_read_bulk_callback),
				   port);
		result = usb_submit_urb(port->read_urb, GFP_KERNEL);
		if (result)
			dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
	}

	return result;
}
EXPORT_SYMBOL_GPL(usb_serial_generic_open);

static void generic_cleanup (struct usb_serial_port *port)
{
	struct usb_serial *serial = port->serial;

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

	if (serial->dev) {
		/* shutdown any bulk reads that might be going on */
		if (serial->num_bulk_out)
			usb_kill_urb(port->write_urb);
		if (serial->num_bulk_in)
			usb_kill_urb(port->read_urb);
	}
}

int usb_serial_generic_resume(struct usb_serial *serial)
{
	struct usb_serial_port *port;
	int i, c = 0, r;

	for (i = 0; i < serial->num_ports; i++) {
		port = serial->port[i];
		if (port->open_count && port->read_urb) {
			r = usb_submit_urb(port->read_urb, GFP_NOIO);
			if (r < 0)
				c++;
		}
	}

	return c ? -EIO : 0;
}

void usb_serial_generic_close (struct usb_serial_port *port, struct file * filp)
{
	dbg("%s - port %d", __FUNCTION__, port->number);
	generic_cleanup (port);
}

int usb_serial_generic_write(struct usb_serial_port *port, const unsigned char *buf, int count)
{
	struct usb_serial *serial = port->serial;
	int result;
	unsigned char *data;

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

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

	/* only do something if we have a bulk out endpoint */
	if (serial->num_bulk_out) {
		unsigned long flags;
		spin_lock_irqsave(&port->lock, flags);
		if (port->write_urb_busy) {
			spin_unlock_irqrestore(&port->lock, flags);
			dbg("%s - already writing", __FUNCTION__);
			return 0;
		}
		port->write_urb_busy = 1;
		spin_unlock_irqrestore(&port->lock, flags);

		count = (count > port->bulk_out_size) ? port->bulk_out_size : count;

		memcpy (port->write_urb->transfer_buffer, buf, count);
		data = port->write_urb->transfer_buffer;
		usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, data);

		/* set up our urb */
		usb_fill_bulk_urb (port->write_urb, serial->dev,
				   usb_sndbulkpipe (serial->dev,
						    port->bulk_out_endpointAddress),
				   port->write_urb->transfer_buffer, count,
				   ((serial->type->write_bulk_callback) ? 
				     serial->type->write_bulk_callback :
				     usb_serial_generic_write_bulk_callback), port);

		/* send the data out the bulk port */
		port->write_urb_busy = 1;
		result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
		if (result) {
			dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
			/* don't have to grab the lock here, as we will retry if != 0 */
			port->write_urb_busy = 0;
		} else
			result = count;

		return result;
	}

	/* no bulk out, so return 0 bytes written */
	return 0;
}

int usb_serial_generic_write_room (struct usb_serial_port *port)
{
	struct usb_serial *serial = port->serial;
	int room = 0;

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

	if (serial->num_bulk_out) {
		if (!(port->write_urb_busy))
			room = port->bulk_out_size;
	}

	dbg("%s - returns %d", __FUNCTION__, room);
	return (room);
}

int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port)
{
	struct usb_serial *serial = port->serial;
	int chars = 0;

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

	if (serial->num_bulk_out) {
		if (port->write_urb_busy)
			chars = port->write_urb->transfer_buffer_length;
	}

	dbg("%s - returns %d", __FUNCTION__, chars);
	return (chars);
}


static void resubmit_read_urb(struct usb_serial_port *port, gfp_t mem_flags)
{
	struct urb *urb = port->read_urb;
	struct usb_serial *serial = port->serial;
	int result;

	/* Continue reading from device */
	usb_fill_bulk_urb (urb, serial->dev,
			   usb_rcvbulkpipe (serial->dev,
				   	    port->bulk_in_endpointAddress),
			   urb->transfer_buffer,
			   urb->transfer_buffer_length,
			   ((serial->type->read_bulk_callback) ? 
			     serial->type->read_bulk_callback : 
			     usb_serial_generic_read_bulk_callback), port);
	result = usb_submit_urb(urb, mem_flags);
	if (result)
		dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
}

/* Push data to tty layer and resubmit the bulk read URB */
static void flush_and_resubmit_read_urb (struct usb_serial_port *port)
{
	struct urb *urb = port->read_urb;
	struct tty_struct *tty = port->tty;
	int room;

	/* Push data to tty */
	if (tty && urb->actual_length) {
		room = tty_buffer_request_room(tty, urb->actual_length);
		if (room) {
			tty_insert_flip_string(tty, urb->transfer_buffer, room);
			tty_flip_buffer_push(tty); /* is this allowed from an URB callback ? */
		}
	}

	resubmit_read_urb(port, GFP_ATOMIC);
}

void usb_serial_generic_read_bulk_callback (struct urb *urb)
{
	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
	unsigned char *data = urb->transfer_buffer;
	int status = urb->status;

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

	if (unlikely(status != 0)) {
		dbg("%s - nonzero read bulk status received: %d",
		    __FUNCTION__, status);
		return;
	}

	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);

	/* Throttle the device if requested by tty */
	spin_lock(&port->lock);
	if (!(port->throttled = port->throttle_req))
		/* Handle data and continue reading from device */
		flush_and_resubmit_read_urb(port);
	spin_unlock(&port->lock);
}
EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);

void usb_serial_generic_write_bulk_callback (struct urb *urb)
{
	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
	int status = urb->status;

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

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

	usb_serial_port_softint(port);
}
EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback);

void usb_serial_generic_throttle (struct usb_serial_port *port)
{
	unsigned long flags;

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

	/* Set the throttle request flag. It will be picked up
	 * by usb_serial_generic_read_bulk_callback(). */
	spin_lock_irqsave(&port->lock, flags);
	port->throttle_req = 1;
	spin_unlock_irqrestore(&port->lock, flags);
}

void usb_serial_generic_unthrottle (struct usb_serial_port *port)
{
	int was_throttled;
	unsigned long flags;

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

	/* Clear the throttle flags */
	spin_lock_irqsave(&port->lock, flags);
	was_throttled = port->throttled;
	port->throttled = port->throttle_req = 0;
	spin_unlock_irqrestore(&port->lock, flags);

	if (was_throttled) {
		/* Resume reading from device */
		resubmit_read_urb(port, GFP_KERNEL);
	}
}

void usb_serial_generic_shutdown (struct usb_serial *serial)
{
	int i;

	dbg("%s", __FUNCTION__);

	/* stop reads and writes on all ports */
	for (i=0; i < serial->num_ports; ++i) {
		generic_cleanup(serial->port[i]);
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* USB Serial Converter Generic functions
	3	*
	4	* Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License version
	8	* 2 as published by the Free Software Foundation.
	9	*
	10	*/
	11
1da177e4 LT	12	#include <linux/kernel.h>
	13	#include <linux/errno.h>
	14	#include <linux/slab.h>
	15	#include <linux/tty.h>
	16	#include <linux/tty_flip.h>
	17	#include <linux/module.h>
	18	#include <linux/moduleparam.h>
	19	#include <linux/usb.h>
a969888c	20	#include <linux/usb/serial.h>
1da177e4	21	#include <asm/uaccess.h>
1da177e4	22
d9b1b787	23
1da177e4 LT	24	static int debug;
	25
	26	#ifdef CONFIG_USB_SERIAL_GENERIC
b46d60fc DB	27
	28	static int generic_probe(struct usb_interface *interface,
	29	const struct usb_device_id *id);
	30
1da177e4 LT	31	static __u16 vendor = 0x05f9;
	32	static __u16 product = 0xffff;
	33
	34	module_param(vendor, ushort, 0);
	35	MODULE_PARM_DESC(vendor, "User specified USB idVendor");
	36
	37	module_param(product, ushort, 0);
	38	MODULE_PARM_DESC(product, "User specified USB idProduct");
	39
	40	static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */
	41
d9b1b787 JH	42	/* we want to look at all devices, as the vendor/product id can change
	43	* depending on the command line argument */
	44	static struct usb_device_id generic_serial_ids[] = {
	45	{.driver_info = 42},
	46	{}
	47	};
	48
	49	static struct usb_driver generic_driver = {
	50	.name = "usbserial_generic",
	51	.probe = generic_probe,
	52	.disconnect = usb_serial_disconnect,
	53	.id_table = generic_serial_ids,
	54	.no_dynamic_id = 1,
	55	};
	56
1da177e4	57	/* All of the device info needed for the Generic Serial Converter */
ea65370d	58	struct usb_serial_driver usb_serial_generic_device = {
18fcac35 GKH	59	.driver = {
18fcac35 GKH	60	.owner = THIS_MODULE,
269bda1c	61	.name = "generic",
18fcac35	62	},
1da177e4	63	.id_table = generic_device_ids,
d9b1b787	64	.usb_driver = &generic_driver,
1da177e4 LT	65	.num_interrupt_in = NUM_DONT_CARE,
	66	.num_bulk_in = NUM_DONT_CARE,
	67	.num_bulk_out = NUM_DONT_CARE,
	68	.num_ports = 1,
	69	.shutdown = usb_serial_generic_shutdown,
253ca923 JR	70	.throttle = usb_serial_generic_throttle,
253ca923 JR	71	.unthrottle = usb_serial_generic_unthrottle,
ec22559e	72	.resume = usb_serial_generic_resume,
1da177e4 LT	73	};
1da177e4 LT	74
1da177e4 LT	75	static int generic_probe(struct usb_interface *interface,
	76	const struct usb_device_id *id)
	77	{
	78	const struct usb_device_id *id_pattern;
	79
	80	id_pattern = usb_match_id(interface, generic_device_ids);
	81	if (id_pattern != NULL)
	82	return usb_serial_probe(interface, id);
	83	return -ENODEV;
	84	}
1da177e4 LT	85	#endif
	86
	87	int usb_serial_generic_register (int _debug)
	88	{
	89	int retval = 0;
	90
	91	debug = _debug;
	92	#ifdef CONFIG_USB_SERIAL_GENERIC
	93	generic_device_ids[0].idVendor = vendor;
	94	generic_device_ids[0].idProduct = product;
	95	generic_device_ids[0].match_flags = USB_DEVICE_ID_MATCH_VENDOR \| USB_DEVICE_ID_MATCH_PRODUCT;
	96
	97	/* register our generic driver with ourselves */
	98	retval = usb_serial_register (&usb_serial_generic_device);
	99	if (retval)
	100	goto exit;
	101	retval = usb_register(&generic_driver);
	102	if (retval)
	103	usb_serial_deregister(&usb_serial_generic_device);
	104	exit:
	105	#endif
	106	return retval;
	107	}
	108
	109	void usb_serial_generic_deregister (void)
	110	{
	111	#ifdef CONFIG_USB_SERIAL_GENERIC
	112	/* remove our generic driver */
	113	usb_deregister(&generic_driver);
	114	usb_serial_deregister (&usb_serial_generic_device);
	115	#endif
	116	}
	117
	118	int usb_serial_generic_open (struct usb_serial_port port, struct file filp)
	119	{
	120	struct usb_serial *serial = port->serial;
	121	int result = 0;
253ca923	122	unsigned long flags;
1da177e4 LT	123
	124	dbg("%s - port %d", __FUNCTION__, port->number);
	125
	126	/* force low_latency on so that our tty_push actually forces the data through,
	127	otherwise it is scheduled, and with high data rates (like with OHCI) data
	128	can get lost. */
	129	if (port->tty)
	130	port->tty->low_latency = 1;
	131
253ca923 JR	132	/* clear the throttle flags */
	133	spin_lock_irqsave(&port->lock, flags);
	134	port->throttled = 0;
	135	port->throttle_req = 0;
	136	spin_unlock_irqrestore(&port->lock, flags);
	137
	138	/* if we have a bulk endpoint, start reading from it */
1da177e4 LT	139	if (serial->num_bulk_in) {
	140	/* Start reading from the device */
	141	usb_fill_bulk_urb (port->read_urb, serial->dev,
	142	usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
	143	port->read_urb->transfer_buffer,
	144	port->read_urb->transfer_buffer_length,
	145	((serial->type->read_bulk_callback) ?
	146	serial->type->read_bulk_callback :
	147	usb_serial_generic_read_bulk_callback),
	148	port);
	149	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
	150	if (result)
	151	dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
	152	}
	153
	154	return result;
	155	}
815ddc99	156	EXPORT_SYMBOL_GPL(usb_serial_generic_open);
1da177e4 LT	157
	158	static void generic_cleanup (struct usb_serial_port *port)
	159	{
	160	struct usb_serial *serial = port->serial;
	161
	162	dbg("%s - port %d", __FUNCTION__, port->number);
	163
	164	if (serial->dev) {
	165	/* shutdown any bulk reads that might be going on */
	166	if (serial->num_bulk_out)
	167	usb_kill_urb(port->write_urb);
	168	if (serial->num_bulk_in)
	169	usb_kill_urb(port->read_urb);
	170	}
	171	}
	172
ec22559e ON	173	int usb_serial_generic_resume(struct usb_serial *serial)
	174	{
	175	struct usb_serial_port *port;
	176	int i, c = 0, r;
	177
	178	for (i = 0; i < serial->num_ports; i++) {
	179	port = serial->port[i];
	180	if (port->open_count && port->read_urb) {
	181	r = usb_submit_urb(port->read_urb, GFP_NOIO);
	182	if (r < 0)
	183	c++;
	184	}
	185	}
	186
	187	return c ? -EIO : 0;
	188	}
	189
1da177e4 LT	190	void usb_serial_generic_close (struct usb_serial_port port, struct file filp)
	191	{
	192	dbg("%s - port %d", __FUNCTION__, port->number);
	193	generic_cleanup (port);
	194	}
	195
	196	int usb_serial_generic_write(struct usb_serial_port port, const unsigned char buf, int count)
	197	{
	198	struct usb_serial *serial = port->serial;
	199	int result;
	200	unsigned char *data;
	201
	202	dbg("%s - port %d", __FUNCTION__, port->number);
	203
	204	if (count == 0) {
	205	dbg("%s - write request of 0 bytes", __FUNCTION__);
	206	return (0);
	207	}
	208
	209	/* only do something if we have a bulk out endpoint */
	210	if (serial->num_bulk_out) {
acd2a847 JK	211	unsigned long flags;
acd2a847 JK	212	spin_lock_irqsave(&port->lock, flags);
507ca9bc	213	if (port->write_urb_busy) {
acd2a847	214	spin_unlock_irqrestore(&port->lock, flags);
1da177e4	215	dbg("%s - already writing", __FUNCTION__);
507ca9bc	216	return 0;
1da177e4	217	}
507ca9bc	218	port->write_urb_busy = 1;
acd2a847	219	spin_unlock_irqrestore(&port->lock, flags);
1da177e4 LT	220
	221	count = (count > port->bulk_out_size) ? port->bulk_out_size : count;
	222
	223	memcpy (port->write_urb->transfer_buffer, buf, count);
	224	data = port->write_urb->transfer_buffer;
	225	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, data);
	226
	227	/* set up our urb */
	228	usb_fill_bulk_urb (port->write_urb, serial->dev,
	229	usb_sndbulkpipe (serial->dev,
	230	port->bulk_out_endpointAddress),
	231	port->write_urb->transfer_buffer, count,
	232	((serial->type->write_bulk_callback) ?
	233	serial->type->write_bulk_callback :
	234	usb_serial_generic_write_bulk_callback), port);
	235
	236	/* send the data out the bulk port */
507ca9bc	237	port->write_urb_busy = 1;
1da177e4	238	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
507ca9bc	239	if (result) {
1da177e4	240	dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
507ca9bc GKH	241	/* don't have to grab the lock here, as we will retry if != 0 */
	242	port->write_urb_busy = 0;
	243	} else
1da177e4 LT	244	result = count;
	245
	246	return result;
	247	}
	248
	249	/* no bulk out, so return 0 bytes written */
507ca9bc	250	return 0;
1da177e4 LT	251	}
	252
	253	int usb_serial_generic_write_room (struct usb_serial_port *port)
	254	{
	255	struct usb_serial *serial = port->serial;
	256	int room = 0;
	257
	258	dbg("%s - port %d", __FUNCTION__, port->number);
507ca9bc	259
1da177e4	260	if (serial->num_bulk_out) {
7a3ca7d2	261	if (!(port->write_urb_busy))
1da177e4 LT	262	room = port->bulk_out_size;
	263	}
	264
	265	dbg("%s - returns %d", __FUNCTION__, room);
	266	return (room);
	267	}
	268
	269	int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port)
	270	{
	271	struct usb_serial *serial = port->serial;
	272	int chars = 0;
	273
	274	dbg("%s - port %d", __FUNCTION__, port->number);
	275
	276	if (serial->num_bulk_out) {
507ca9bc	277	if (port->write_urb_busy)
1da177e4 LT	278	chars = port->write_urb->transfer_buffer_length;
	279	}
	280
	281	dbg("%s - returns %d", __FUNCTION__, chars);
	282	return (chars);
	283	}
	284
1abdeeb1 ON	285
1abdeeb1 ON	286	static void resubmit_read_urb(struct usb_serial_port *port, gfp_t mem_flags)
1da177e4	287	{
253ca923	288	struct urb *urb = port->read_urb;
1abdeeb1	289	struct usb_serial *serial = port->serial;
1da177e4 LT	290	int result;
1da177e4 LT	291
253ca923	292	/* Continue reading from device */
1abdeeb1	293	usb_fill_bulk_urb (urb, serial->dev,
1da177e4 LT	294	usb_rcvbulkpipe (serial->dev,
1da177e4 LT	295	port->bulk_in_endpointAddress),
1abdeeb1 ON	296	urb->transfer_buffer,
1abdeeb1 ON	297	urb->transfer_buffer_length,
1da177e4 LT	298	((serial->type->read_bulk_callback) ?
	299	serial->type->read_bulk_callback :
	300	usb_serial_generic_read_bulk_callback), port);
1abdeeb1	301	result = usb_submit_urb(urb, mem_flags);
1da177e4 LT	302	if (result)
	303	dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
	304	}
253ca923	305
1abdeeb1 ON	306	/* Push data to tty layer and resubmit the bulk read URB */
	307	static void flush_and_resubmit_read_urb (struct usb_serial_port *port)
	308	{
	309	struct urb *urb = port->read_urb;
	310	struct tty_struct *tty = port->tty;
	311	int room;
	312
	313	/* Push data to tty */
	314	if (tty && urb->actual_length) {
	315	room = tty_buffer_request_room(tty, urb->actual_length);
	316	if (room) {
	317	tty_insert_flip_string(tty, urb->transfer_buffer, room);
	318	tty_flip_buffer_push(tty); /* is this allowed from an URB callback ? */
	319	}
	320	}
	321
	322	resubmit_read_urb(port, GFP_ATOMIC);
	323	}
	324
253ca923 JR	325	void usb_serial_generic_read_bulk_callback (struct urb *urb)
	326	{
	327	struct usb_serial_port port = (struct usb_serial_port )urb->context;
	328	unsigned char *data = urb->transfer_buffer;
fbd27225	329	int status = urb->status;
253ca923 JR	330
	331	dbg("%s - port %d", __FUNCTION__, port->number);
	332
fbd27225 GKH	333	if (unlikely(status != 0)) {
	334	dbg("%s - nonzero read bulk status received: %d",
	335	__FUNCTION__, status);
253ca923 JR	336	return;
	337	}
	338
	339	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
	340
	341	/* Throttle the device if requested by tty */
1abdeeb1 ON	342	spin_lock(&port->lock);
	343	if (!(port->throttled = port->throttle_req))
	344	/* Handle data and continue reading from device */
	345	flush_and_resubmit_read_urb(port);
	346	spin_unlock(&port->lock);
253ca923	347	}
166ffccf	348	EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);
1da177e4	349
7d12e780	350	void usb_serial_generic_write_bulk_callback (struct urb *urb)
1da177e4 LT	351	{
1da177e4 LT	352	struct usb_serial_port port = (struct usb_serial_port )urb->context;
fbd27225	353	int status = urb->status;
1da177e4 LT	354
	355	dbg("%s - port %d", __FUNCTION__, port->number);
	356
507ca9bc	357	port->write_urb_busy = 0;
fbd27225 GKH	358	if (status) {
	359	dbg("%s - nonzero write bulk status received: %d",
	360	__FUNCTION__, status);
1da177e4 LT	361	return;
	362	}
	363
cf2c7481	364	usb_serial_port_softint(port);
1da177e4	365	}
bb833986	366	EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback);
1da177e4	367
253ca923 JR	368	void usb_serial_generic_throttle (struct usb_serial_port *port)
	369	{
	370	unsigned long flags;
	371
	372	dbg("%s - port %d", __FUNCTION__, port->number);
	373
	374	/* Set the throttle request flag. It will be picked up
	375	* by usb_serial_generic_read_bulk_callback(). */
	376	spin_lock_irqsave(&port->lock, flags);
	377	port->throttle_req = 1;
	378	spin_unlock_irqrestore(&port->lock, flags);
	379	}
	380
	381	void usb_serial_generic_unthrottle (struct usb_serial_port *port)
	382	{
	383	int was_throttled;
	384	unsigned long flags;
	385
	386	dbg("%s - port %d", __FUNCTION__, port->number);
	387
	388	/* Clear the throttle flags */
	389	spin_lock_irqsave(&port->lock, flags);
	390	was_throttled = port->throttled;
	391	port->throttled = port->throttle_req = 0;
	392	spin_unlock_irqrestore(&port->lock, flags);
	393
	394	if (was_throttled) {
1abdeeb1 ON	395	/* Resume reading from device */
1abdeeb1 ON	396	resubmit_read_urb(port, GFP_KERNEL);
253ca923 JR	397	}
	398	}
	399
1da177e4 LT	400	void usb_serial_generic_shutdown (struct usb_serial *serial)
	401	{
	402	int i;
	403
	404	dbg("%s", __FUNCTION__);
	405
	406	/* stop reads and writes on all ports */
	407	for (i=0; i < serial->num_ports; ++i) {
	408	generic_cleanup(serial->port[i]);
	409	}
	410	}
	411