[GitHub/mt8127/android_kernel_alcatel_ttab.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) {
		spin_lock_bh(&port->lock);
		if (port->write_urb_busy) {
			spin_unlock_bh(&port->lock);
			dbg("%s - already writing", __FUNCTION__);
			return 0;
		}
		port->write_urb_busy = 1;
		spin_unlock_bh(&port->lock);

		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);
}

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

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

	/* Continue reading from 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_ATOMIC);
	if (result)
		dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
}

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 is_throttled;
	unsigned long flags;

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

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

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

	/* Throttle the device if requested by tty */
	if (urb->actual_length) {
		spin_lock_irqsave(&port->lock, flags);
		is_throttled = port->throttled = port->throttle_req;
		spin_unlock_irqrestore(&port->lock, flags);
		if (is_throttled) {
			/* Let the received data linger in the read URB;
			 * usb_serial_generic_unthrottle() will pick it
			 * up later. */
			dbg("%s - throttling device", __FUNCTION__);
			return;
		}
	}

	/* Handle data and continue reading from device */
	flush_and_resubmit_read_urb(port);
}
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;

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

	port->write_urb_busy = 0;
	if (urb->status) {
		dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->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) {
		/* Handle pending data and resume reading from device */
		flush_and_resubmit_read_urb(port);
	}
}

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) {
e81ee637	211	spin_lock_bh(&port->lock);
507ca9bc	212	if (port->write_urb_busy) {
e81ee637	213	spin_unlock_bh(&port->lock);
1da177e4	214	dbg("%s - already writing", __FUNCTION__);
507ca9bc	215	return 0;
1da177e4	216	}
507ca9bc	217	port->write_urb_busy = 1;
e81ee637	218	spin_unlock_bh(&port->lock);
1da177e4 LT	219
	220	count = (count > port->bulk_out_size) ? port->bulk_out_size : count;
	221
	222	memcpy (port->write_urb->transfer_buffer, buf, count);
	223	data = port->write_urb->transfer_buffer;
	224	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, data);
	225
	226	/* set up our urb */
	227	usb_fill_bulk_urb (port->write_urb, serial->dev,
	228	usb_sndbulkpipe (serial->dev,
	229	port->bulk_out_endpointAddress),
	230	port->write_urb->transfer_buffer, count,
	231	((serial->type->write_bulk_callback) ?
	232	serial->type->write_bulk_callback :
	233	usb_serial_generic_write_bulk_callback), port);
	234
	235	/* send the data out the bulk port */
507ca9bc	236	port->write_urb_busy = 1;
1da177e4	237	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
507ca9bc	238	if (result) {
1da177e4	239	dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
507ca9bc GKH	240	/* don't have to grab the lock here, as we will retry if != 0 */
	241	port->write_urb_busy = 0;
	242	} else
1da177e4 LT	243	result = count;
	244
	245	return result;
	246	}
	247
	248	/* no bulk out, so return 0 bytes written */
507ca9bc	249	return 0;
1da177e4 LT	250	}
	251
	252	int usb_serial_generic_write_room (struct usb_serial_port *port)
	253	{
	254	struct usb_serial *serial = port->serial;
	255	int room = 0;
	256
	257	dbg("%s - port %d", __FUNCTION__, port->number);
507ca9bc	258
1da177e4	259	if (serial->num_bulk_out) {
7a3ca7d2	260	if (!(port->write_urb_busy))
1da177e4 LT	261	room = port->bulk_out_size;
	262	}
	263
	264	dbg("%s - returns %d", __FUNCTION__, room);
	265	return (room);
	266	}
	267
	268	int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port)
	269	{
	270	struct usb_serial *serial = port->serial;
	271	int chars = 0;
	272
	273	dbg("%s - port %d", __FUNCTION__, port->number);
	274
	275	if (serial->num_bulk_out) {
507ca9bc	276	if (port->write_urb_busy)
1da177e4 LT	277	chars = port->write_urb->transfer_buffer_length;
	278	}
	279
	280	dbg("%s - returns %d", __FUNCTION__, chars);
	281	return (chars);
	282	}
	283
253ca923 JR	284	/* Push data to tty layer and resubmit the bulk read URB */
253ca923 JR	285	static void flush_and_resubmit_read_urb (struct usb_serial_port *port)
1da177e4	286	{
1da177e4	287	struct usb_serial *serial = port->serial;
253ca923 JR	288	struct urb *urb = port->read_urb;
253ca923 JR	289	struct tty_struct *tty = port->tty;
1da177e4 LT	290	int result;
1da177e4 LT	291
253ca923	292	/* Push data to tty */
1da177e4	293	if (tty && urb->actual_length) {
33f0f88f	294	tty_buffer_request_room(tty, urb->actual_length);
253ca923 JR	295	tty_insert_flip_string(tty, urb->transfer_buffer, urb->actual_length);
253ca923 JR	296	tty_flip_buffer_push(tty); /* is this allowed from an URB callback ? */
1da177e4 LT	297	}
1da177e4 LT	298
253ca923	299	/* Continue reading from device */
1da177e4 LT	300	usb_fill_bulk_urb (port->read_urb, serial->dev,
	301	usb_rcvbulkpipe (serial->dev,
	302	port->bulk_in_endpointAddress),
	303	port->read_urb->transfer_buffer,
	304	port->read_urb->transfer_buffer_length,
	305	((serial->type->read_bulk_callback) ?
	306	serial->type->read_bulk_callback :
	307	usb_serial_generic_read_bulk_callback), port);
	308	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
	309	if (result)
	310	dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
	311	}
253ca923 JR	312
	313	void usb_serial_generic_read_bulk_callback (struct urb *urb)
	314	{
	315	struct usb_serial_port port = (struct usb_serial_port )urb->context;
	316	unsigned char *data = urb->transfer_buffer;
	317	int is_throttled;
	318	unsigned long flags;
	319
	320	dbg("%s - port %d", __FUNCTION__, port->number);
	321
	322	if (urb->status) {
	323	dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
	324	return;
	325	}
	326
	327	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
	328
	329	/* Throttle the device if requested by tty */
	330	if (urb->actual_length) {
	331	spin_lock_irqsave(&port->lock, flags);
	332	is_throttled = port->throttled = port->throttle_req;
	333	spin_unlock_irqrestore(&port->lock, flags);
	334	if (is_throttled) {
	335	/* Let the received data linger in the read URB;
	336	* usb_serial_generic_unthrottle() will pick it
	337	* up later. */
	338	dbg("%s - throttling device", __FUNCTION__);
	339	return;
	340	}
	341	}
	342
	343	/* Handle data and continue reading from device */
	344	flush_and_resubmit_read_urb(port);
	345	}
166ffccf	346	EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);
1da177e4	347
7d12e780	348	void usb_serial_generic_write_bulk_callback (struct urb *urb)
1da177e4 LT	349	{
	350	struct usb_serial_port port = (struct usb_serial_port )urb->context;
	351
	352	dbg("%s - port %d", __FUNCTION__, port->number);
	353
507ca9bc	354	port->write_urb_busy = 0;
1da177e4 LT	355	if (urb->status) {
	356	dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
	357	return;
	358	}
	359
cf2c7481	360	usb_serial_port_softint(port);
1da177e4	361	}
bb833986	362	EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback);
1da177e4	363
253ca923 JR	364	void usb_serial_generic_throttle (struct usb_serial_port *port)
	365	{
	366	unsigned long flags;
	367
	368	dbg("%s - port %d", __FUNCTION__, port->number);
	369
	370	/* Set the throttle request flag. It will be picked up
	371	* by usb_serial_generic_read_bulk_callback(). */
	372	spin_lock_irqsave(&port->lock, flags);
	373	port->throttle_req = 1;
	374	spin_unlock_irqrestore(&port->lock, flags);
	375	}
	376
	377	void usb_serial_generic_unthrottle (struct usb_serial_port *port)
	378	{
	379	int was_throttled;
	380	unsigned long flags;
	381
	382	dbg("%s - port %d", __FUNCTION__, port->number);
	383
	384	/* Clear the throttle flags */
	385	spin_lock_irqsave(&port->lock, flags);
	386	was_throttled = port->throttled;
	387	port->throttled = port->throttle_req = 0;
	388	spin_unlock_irqrestore(&port->lock, flags);
	389
	390	if (was_throttled) {
	391	/* Handle pending data and resume reading from device */
	392	flush_and_resubmit_read_urb(port);
	393	}
	394	}
	395
1da177e4 LT	396	void usb_serial_generic_shutdown (struct usb_serial *serial)
	397	{
	398	int i;
	399
	400	dbg("%s", __FUNCTION__);
	401
	402	/* stop reads and writes on all ports */
	403	for (i=0; i < serial->num_ports; ++i) {
	404	generic_cleanup(serial->port[i]);
	405	}
	406	}
	407