[deliverable/linux.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_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;

#ifdef CONFIG_PM
	/*
	 * If this is an autoresume, don't submit URBs.
	 * They will be submitted in the open function instead.
	 */
	if (serial->dev->auto_pm)
		return 0;
#endif
	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);
		}
	}

	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;
	unsigned long flags;

	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_irqsave(&port->lock, flags);
	if (!(port->throttled = port->throttle_req)) {
		spin_unlock_irqrestore(&port->lock, flags);
		flush_and_resubmit_read_urb(port);
	} else {
		spin_unlock_irqrestore(&port->lock, flags);
	}
}
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_ports = 1,
1da177e4 LT	66	.shutdown = usb_serial_generic_shutdown,
253ca923 JR	67	.throttle = usb_serial_generic_throttle,
253ca923 JR	68	.unthrottle = usb_serial_generic_unthrottle,
ec22559e	69	.resume = usb_serial_generic_resume,
1da177e4 LT	70	};
1da177e4 LT	71
1da177e4 LT	72	static int generic_probe(struct usb_interface *interface,
	73	const struct usb_device_id *id)
	74	{
	75	const struct usb_device_id *id_pattern;
	76
	77	id_pattern = usb_match_id(interface, generic_device_ids);
	78	if (id_pattern != NULL)
	79	return usb_serial_probe(interface, id);
	80	return -ENODEV;
	81	}
1da177e4 LT	82	#endif
	83
	84	int usb_serial_generic_register (int _debug)
	85	{
	86	int retval = 0;
	87
	88	debug = _debug;
	89	#ifdef CONFIG_USB_SERIAL_GENERIC
	90	generic_device_ids[0].idVendor = vendor;
	91	generic_device_ids[0].idProduct = product;
	92	generic_device_ids[0].match_flags = USB_DEVICE_ID_MATCH_VENDOR \| USB_DEVICE_ID_MATCH_PRODUCT;
	93
	94	/* register our generic driver with ourselves */
	95	retval = usb_serial_register (&usb_serial_generic_device);
	96	if (retval)
	97	goto exit;
	98	retval = usb_register(&generic_driver);
	99	if (retval)
	100	usb_serial_deregister(&usb_serial_generic_device);
	101	exit:
	102	#endif
	103	return retval;
	104	}
	105
	106	void usb_serial_generic_deregister (void)
	107	{
	108	#ifdef CONFIG_USB_SERIAL_GENERIC
	109	/* remove our generic driver */
	110	usb_deregister(&generic_driver);
	111	usb_serial_deregister (&usb_serial_generic_device);
	112	#endif
	113	}
	114
	115	int usb_serial_generic_open (struct usb_serial_port port, struct file filp)
	116	{
	117	struct usb_serial *serial = port->serial;
	118	int result = 0;
253ca923	119	unsigned long flags;
1da177e4 LT	120
	121	dbg("%s - port %d", __FUNCTION__, port->number);
	122
	123	/* force low_latency on so that our tty_push actually forces the data through,
	124	otherwise it is scheduled, and with high data rates (like with OHCI) data
	125	can get lost. */
	126	if (port->tty)
	127	port->tty->low_latency = 1;
	128
253ca923 JR	129	/* clear the throttle flags */
	130	spin_lock_irqsave(&port->lock, flags);
	131	port->throttled = 0;
	132	port->throttle_req = 0;
	133	spin_unlock_irqrestore(&port->lock, flags);
	134
	135	/* if we have a bulk endpoint, start reading from it */
1da177e4 LT	136	if (serial->num_bulk_in) {
	137	/* Start reading from the device */
	138	usb_fill_bulk_urb (port->read_urb, serial->dev,
	139	usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
	140	port->read_urb->transfer_buffer,
	141	port->read_urb->transfer_buffer_length,
	142	((serial->type->read_bulk_callback) ?
	143	serial->type->read_bulk_callback :
	144	usb_serial_generic_read_bulk_callback),
	145	port);
	146	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
	147	if (result)
	148	dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
	149	}
	150
	151	return result;
	152	}
815ddc99	153	EXPORT_SYMBOL_GPL(usb_serial_generic_open);
1da177e4 LT	154
	155	static void generic_cleanup (struct usb_serial_port *port)
	156	{
	157	struct usb_serial *serial = port->serial;
	158
	159	dbg("%s - port %d", __FUNCTION__, port->number);
	160
	161	if (serial->dev) {
	162	/* shutdown any bulk reads that might be going on */
	163	if (serial->num_bulk_out)
	164	usb_kill_urb(port->write_urb);
	165	if (serial->num_bulk_in)
	166	usb_kill_urb(port->read_urb);
	167	}
	168	}
	169
ec22559e ON	170	int usb_serial_generic_resume(struct usb_serial *serial)
	171	{
	172	struct usb_serial_port *port;
	173	int i, c = 0, r;
	174
f0fbd5b9 SS	175	#ifdef CONFIG_PM
	176	/*
	177	* If this is an autoresume, don't submit URBs.
	178	* They will be submitted in the open function instead.
	179	*/
	180	if (serial->dev->auto_pm)
	181	return 0;
	182	#endif
ec22559e ON	183	for (i = 0; i < serial->num_ports; i++) {
	184	port = serial->port[i];
	185	if (port->open_count && port->read_urb) {
	186	r = usb_submit_urb(port->read_urb, GFP_NOIO);
	187	if (r < 0)
	188	c++;
	189	}
	190	}
	191
	192	return c ? -EIO : 0;
	193	}
	194
1da177e4 LT	195	void usb_serial_generic_close (struct usb_serial_port port, struct file filp)
	196	{
	197	dbg("%s - port %d", __FUNCTION__, port->number);
	198	generic_cleanup (port);
	199	}
	200
	201	int usb_serial_generic_write(struct usb_serial_port port, const unsigned char buf, int count)
	202	{
	203	struct usb_serial *serial = port->serial;
	204	int result;
	205	unsigned char *data;
	206
	207	dbg("%s - port %d", __FUNCTION__, port->number);
	208
	209	if (count == 0) {
	210	dbg("%s - write request of 0 bytes", __FUNCTION__);
	211	return (0);
	212	}
	213
	214	/* only do something if we have a bulk out endpoint */
	215	if (serial->num_bulk_out) {
acd2a847 JK	216	unsigned long flags;
acd2a847 JK	217	spin_lock_irqsave(&port->lock, flags);
507ca9bc	218	if (port->write_urb_busy) {
acd2a847	219	spin_unlock_irqrestore(&port->lock, flags);
1da177e4	220	dbg("%s - already writing", __FUNCTION__);
507ca9bc	221	return 0;
1da177e4	222	}
507ca9bc	223	port->write_urb_busy = 1;
acd2a847	224	spin_unlock_irqrestore(&port->lock, flags);
1da177e4 LT	225
	226	count = (count > port->bulk_out_size) ? port->bulk_out_size : count;
	227
	228	memcpy (port->write_urb->transfer_buffer, buf, count);
	229	data = port->write_urb->transfer_buffer;
	230	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, data);
	231
	232	/* set up our urb */
	233	usb_fill_bulk_urb (port->write_urb, serial->dev,
	234	usb_sndbulkpipe (serial->dev,
	235	port->bulk_out_endpointAddress),
	236	port->write_urb->transfer_buffer, count,
	237	((serial->type->write_bulk_callback) ?
	238	serial->type->write_bulk_callback :
	239	usb_serial_generic_write_bulk_callback), port);
	240
	241	/* send the data out the bulk port */
507ca9bc	242	port->write_urb_busy = 1;
1da177e4	243	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
507ca9bc	244	if (result) {
1da177e4	245	dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
507ca9bc GKH	246	/* don't have to grab the lock here, as we will retry if != 0 */
	247	port->write_urb_busy = 0;
	248	} else
1da177e4 LT	249	result = count;
	250
	251	return result;
	252	}
	253
	254	/* no bulk out, so return 0 bytes written */
507ca9bc	255	return 0;
1da177e4 LT	256	}
	257
	258	int usb_serial_generic_write_room (struct usb_serial_port *port)
	259	{
	260	struct usb_serial *serial = port->serial;
	261	int room = 0;
	262
	263	dbg("%s - port %d", __FUNCTION__, port->number);
507ca9bc	264
1da177e4	265	if (serial->num_bulk_out) {
7a3ca7d2	266	if (!(port->write_urb_busy))
1da177e4 LT	267	room = port->bulk_out_size;
	268	}
	269
	270	dbg("%s - returns %d", __FUNCTION__, room);
	271	return (room);
	272	}
	273
	274	int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port)
	275	{
	276	struct usb_serial *serial = port->serial;
	277	int chars = 0;
	278
	279	dbg("%s - port %d", __FUNCTION__, port->number);
	280
	281	if (serial->num_bulk_out) {
507ca9bc	282	if (port->write_urb_busy)
1da177e4 LT	283	chars = port->write_urb->transfer_buffer_length;
	284	}
	285
	286	dbg("%s - returns %d", __FUNCTION__, chars);
	287	return (chars);
	288	}
	289
1abdeeb1 ON	290
1abdeeb1 ON	291	static void resubmit_read_urb(struct usb_serial_port *port, gfp_t mem_flags)
1da177e4	292	{
253ca923	293	struct urb *urb = port->read_urb;
1abdeeb1	294	struct usb_serial *serial = port->serial;
1da177e4 LT	295	int result;
1da177e4 LT	296
253ca923	297	/* Continue reading from device */
1abdeeb1	298	usb_fill_bulk_urb (urb, serial->dev,
1da177e4 LT	299	usb_rcvbulkpipe (serial->dev,
1da177e4 LT	300	port->bulk_in_endpointAddress),
1abdeeb1 ON	301	urb->transfer_buffer,
1abdeeb1 ON	302	urb->transfer_buffer_length,
1da177e4 LT	303	((serial->type->read_bulk_callback) ?
	304	serial->type->read_bulk_callback :
	305	usb_serial_generic_read_bulk_callback), port);
1abdeeb1	306	result = usb_submit_urb(urb, mem_flags);
1da177e4 LT	307	if (result)
	308	dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
	309	}
253ca923	310
1abdeeb1 ON	311	/* Push data to tty layer and resubmit the bulk read URB */
	312	static void flush_and_resubmit_read_urb (struct usb_serial_port *port)
	313	{
	314	struct urb *urb = port->read_urb;
	315	struct tty_struct *tty = port->tty;
	316	int room;
	317
	318	/* Push data to tty */
	319	if (tty && urb->actual_length) {
	320	room = tty_buffer_request_room(tty, urb->actual_length);
	321	if (room) {
	322	tty_insert_flip_string(tty, urb->transfer_buffer, room);
b507cc97	323	tty_flip_buffer_push(tty);
1abdeeb1 ON	324	}
	325	}
	326
	327	resubmit_read_urb(port, GFP_ATOMIC);
	328	}
	329
253ca923 JR	330	void usb_serial_generic_read_bulk_callback (struct urb *urb)
	331	{
	332	struct usb_serial_port port = (struct usb_serial_port )urb->context;
	333	unsigned char *data = urb->transfer_buffer;
fbd27225	334	int status = urb->status;
bfaeafcf	335	unsigned long flags;
253ca923 JR	336
	337	dbg("%s - port %d", __FUNCTION__, port->number);
	338
fbd27225 GKH	339	if (unlikely(status != 0)) {
	340	dbg("%s - nonzero read bulk status received: %d",
	341	__FUNCTION__, status);
253ca923 JR	342	return;
	343	}
	344
	345	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
	346
	347	/* Throttle the device if requested by tty */
bfaeafcf	348	spin_lock_irqsave(&port->lock, flags);
b507cc97 PZ	349	if (!(port->throttled = port->throttle_req)) {
b507cc97 PZ	350	spin_unlock_irqrestore(&port->lock, flags);
1abdeeb1	351	flush_and_resubmit_read_urb(port);
b507cc97 PZ	352	} else {
	353	spin_unlock_irqrestore(&port->lock, flags);
	354	}
253ca923	355	}
166ffccf	356	EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);
1da177e4	357
7d12e780	358	void usb_serial_generic_write_bulk_callback (struct urb *urb)
1da177e4 LT	359	{
1da177e4 LT	360	struct usb_serial_port port = (struct usb_serial_port )urb->context;
fbd27225	361	int status = urb->status;
1da177e4 LT	362
	363	dbg("%s - port %d", __FUNCTION__, port->number);
	364
507ca9bc	365	port->write_urb_busy = 0;
fbd27225 GKH	366	if (status) {
	367	dbg("%s - nonzero write bulk status received: %d",
	368	__FUNCTION__, status);
1da177e4 LT	369	return;
	370	}
	371
cf2c7481	372	usb_serial_port_softint(port);
1da177e4	373	}
bb833986	374	EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback);
1da177e4	375
253ca923 JR	376	void usb_serial_generic_throttle (struct usb_serial_port *port)
	377	{
	378	unsigned long flags;
	379
	380	dbg("%s - port %d", __FUNCTION__, port->number);
	381
	382	/* Set the throttle request flag. It will be picked up
	383	* by usb_serial_generic_read_bulk_callback(). */
	384	spin_lock_irqsave(&port->lock, flags);
	385	port->throttle_req = 1;
	386	spin_unlock_irqrestore(&port->lock, flags);
	387	}
	388
	389	void usb_serial_generic_unthrottle (struct usb_serial_port *port)
	390	{
	391	int was_throttled;
	392	unsigned long flags;
	393
	394	dbg("%s - port %d", __FUNCTION__, port->number);
	395
	396	/* Clear the throttle flags */
	397	spin_lock_irqsave(&port->lock, flags);
	398	was_throttled = port->throttled;
	399	port->throttled = port->throttle_req = 0;
	400	spin_unlock_irqrestore(&port->lock, flags);
	401
	402	if (was_throttled) {
1abdeeb1 ON	403	/* Resume reading from device */
1abdeeb1 ON	404	resubmit_read_urb(port, GFP_KERNEL);
253ca923 JR	405	}
	406	}
	407
1da177e4 LT	408	void usb_serial_generic_shutdown (struct usb_serial *serial)
	409	{
	410	int i;
	411
	412	dbg("%s", __FUNCTION__);
	413
	414	/* stop reads and writes on all ports */
	415	for (i=0; i < serial->num_ports; ++i) {
	416	generic_cleanup(serial->port[i]);
	417	}
	418	}
	419