[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 <linux/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 tty_struct *tty,
			struct usb_serial_port *port, struct file *filp)
{
	struct usb_serial *serial = port->serial;
	int result = 0;
	unsigned long flags;

	dbg("%s - port %d", __func__, 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 (tty)
		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",
							__func__, 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", __func__, 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->port.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 tty_struct *tty,
			struct usb_serial_port *port, struct file *filp)
{
	dbg("%s - port %d", __func__, port->number);
	generic_cleanup(port);
}

int usb_serial_generic_write(struct tty_struct *tty,
	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", __func__, port->number);

	if (count == 0) {
		dbg("%s - write request of 0 bytes", __func__);
		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", __func__);
			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, __func__, 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",
							__func__, 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 tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct usb_serial *serial = port->serial;
	int room = 0;

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

	/* FIXME: Locking */
	if (serial->num_bulk_out) {
		if (!(port->write_urb_busy))
			room = port->bulk_out_size;
	}

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

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

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

	/* FIXME: Locking */
	if (serial->num_bulk_out) {
		if (port->write_urb_busy)
			chars = port->write_urb->transfer_buffer_length;
	}

	dbg("%s - returns %d", __func__, 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",
							__func__, 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 = tty_port_tty_get(&port->port);
	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);
		}
	}
	tty_kref_put(tty);

	resubmit_read_urb(port, GFP_ATOMIC);
}

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

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

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

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

	/* Throttle the device if requested by tty */
	spin_lock_irqsave(&port->lock, flags);
	port->throttled = port->throttle_req;
	if (!port->throttled) {
		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 = urb->context;
	int status = urb->status;

	dbg("%s - port %d", __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);
}
EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback);

void usb_serial_generic_throttle(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	unsigned long flags;

	dbg("%s - port %d", __func__, 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 tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	int was_throttled;
	unsigned long flags;

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

	/* 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>
ae64387a	21	#include <linux/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
1da177e4 LT	83
ae64387a	84	int usb_serial_generic_register(int _debug)
1da177e4 LT	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;
ae64387a AC	92	generic_device_ids[0].match_flags =
ae64387a AC	93	USB_DEVICE_ID_MATCH_VENDOR \| USB_DEVICE_ID_MATCH_PRODUCT;
1da177e4 LT	94
1da177e4 LT	95	/* register our generic driver with ourselves */
ae64387a	96	retval = usb_serial_register(&usb_serial_generic_device);
1da177e4 LT	97	if (retval)
	98	goto exit;
	99	retval = usb_register(&generic_driver);
	100	if (retval)
	101	usb_serial_deregister(&usb_serial_generic_device);
	102	exit:
	103	#endif
	104	return retval;
	105	}
	106
ae64387a	107	void usb_serial_generic_deregister(void)
1da177e4 LT	108	{
	109	#ifdef CONFIG_USB_SERIAL_GENERIC
	110	/* remove our generic driver */
	111	usb_deregister(&generic_driver);
ae64387a	112	usb_serial_deregister(&usb_serial_generic_device);
1da177e4 LT	113	#endif
	114	}
	115
95da310e AC	116	int usb_serial_generic_open(struct tty_struct *tty,
95da310e AC	117	struct usb_serial_port port, struct file filp)
1da177e4 LT	118	{
	119	struct usb_serial *serial = port->serial;
	120	int result = 0;
253ca923	121	unsigned long flags;
1da177e4	122
441b62c1	123	dbg("%s - port %d", __func__, port->number);
1da177e4	124
ae64387a AC	125	/* force low_latency on so that our tty_push actually forces the data
	126	through, otherwise it is scheduled, and with high data rates (like
	127	with OHCI) data can get lost. */
95da310e AC	128	if (tty)
95da310e AC	129	tty->low_latency = 1;
1da177e4	130
253ca923 JR	131	/* clear the throttle flags */
	132	spin_lock_irqsave(&port->lock, flags);
	133	port->throttled = 0;
	134	port->throttle_req = 0;
	135	spin_unlock_irqrestore(&port->lock, flags);
	136
	137	/* if we have a bulk endpoint, start reading from it */
1da177e4 LT	138	if (serial->num_bulk_in) {
1da177e4 LT	139	/* Start reading from the device */
ae64387a AC	140	usb_fill_bulk_urb(port->read_urb, serial->dev,
	141	usb_rcvbulkpipe(serial->dev,
	142	port->bulk_in_endpointAddress),
1da177e4 LT	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)
ae64387a AC	151	dev_err(&port->dev,
	152	"%s - failed resubmitting read urb, error %d\n",
	153	__func__, result);
1da177e4 LT	154	}
	155
	156	return result;
	157	}
815ddc99	158	EXPORT_SYMBOL_GPL(usb_serial_generic_open);
1da177e4	159
95da310e	160	static void generic_cleanup(struct usb_serial_port *port)
1da177e4 LT	161	{
	162	struct usb_serial *serial = port->serial;
	163
441b62c1	164	dbg("%s - port %d", __func__, port->number);
1da177e4 LT	165
	166	if (serial->dev) {
	167	/* shutdown any bulk reads that might be going on */
	168	if (serial->num_bulk_out)
	169	usb_kill_urb(port->write_urb);
	170	if (serial->num_bulk_in)
	171	usb_kill_urb(port->read_urb);
	172	}
	173	}
	174
ec22559e ON	175	int usb_serial_generic_resume(struct usb_serial *serial)
	176	{
	177	struct usb_serial_port *port;
	178	int i, c = 0, r;
	179
f0fbd5b9 SS	180	#ifdef CONFIG_PM
	181	/*
	182	* If this is an autoresume, don't submit URBs.
	183	* They will be submitted in the open function instead.
	184	*/
	185	if (serial->dev->auto_pm)
	186	return 0;
	187	#endif
ec22559e ON	188	for (i = 0; i < serial->num_ports; i++) {
ec22559e ON	189	port = serial->port[i];
95da310e	190	if (port->port.count && port->read_urb) {
ec22559e ON	191	r = usb_submit_urb(port->read_urb, GFP_NOIO);
	192	if (r < 0)
	193	c++;
	194	}
	195	}
	196
	197	return c ? -EIO : 0;
	198	}
	199
95da310e	200	void usb_serial_generic_close(struct tty_struct *tty,
ae64387a	201	struct usb_serial_port port, struct file filp)
1da177e4	202	{
441b62c1	203	dbg("%s - port %d", __func__, port->number);
ae64387a	204	generic_cleanup(port);
1da177e4 LT	205	}
1da177e4 LT	206
95da310e AC	207	int usb_serial_generic_write(struct tty_struct *tty,
95da310e AC	208	struct usb_serial_port port, const unsigned char buf, int count)
1da177e4 LT	209	{
	210	struct usb_serial *serial = port->serial;
	211	int result;
	212	unsigned char *data;
	213
441b62c1	214	dbg("%s - port %d", __func__, port->number);
1da177e4 LT	215
1da177e4 LT	216	if (count == 0) {
441b62c1	217	dbg("%s - write request of 0 bytes", __func__);
ae64387a	218	return 0;
1da177e4 LT	219	}
	220
	221	/* only do something if we have a bulk out endpoint */
	222	if (serial->num_bulk_out) {
acd2a847 JK	223	unsigned long flags;
acd2a847 JK	224	spin_lock_irqsave(&port->lock, flags);
507ca9bc	225	if (port->write_urb_busy) {
acd2a847	226	spin_unlock_irqrestore(&port->lock, flags);
441b62c1	227	dbg("%s - already writing", __func__);
507ca9bc	228	return 0;
1da177e4	229	}
507ca9bc	230	port->write_urb_busy = 1;
acd2a847	231	spin_unlock_irqrestore(&port->lock, flags);
1da177e4	232
ae64387a AC	233	count = (count > port->bulk_out_size) ?
ae64387a AC	234	port->bulk_out_size : count;
1da177e4	235
ae64387a	236	memcpy(port->write_urb->transfer_buffer, buf, count);
1da177e4	237	data = port->write_urb->transfer_buffer;
441b62c1	238	usb_serial_debug_data(debug, &port->dev, __func__, count, data);
1da177e4 LT	239
1da177e4 LT	240	/* set up our urb */
ae64387a AC	241	usb_fill_bulk_urb(port->write_urb, serial->dev,
	242	usb_sndbulkpipe(serial->dev,
	243	port->bulk_out_endpointAddress),
1da177e4	244	port->write_urb->transfer_buffer, count,
ae64387a	245	((serial->type->write_bulk_callback) ?
1da177e4	246	serial->type->write_bulk_callback :
ae64387a AC	247	usb_serial_generic_write_bulk_callback),
ae64387a AC	248	port);
1da177e4 LT	249
1da177e4 LT	250	/* send the data out the bulk port */
507ca9bc	251	port->write_urb_busy = 1;
1da177e4	252	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
507ca9bc	253	if (result) {
ae64387a AC	254	dev_err(&port->dev,
	255	"%s - failed submitting write urb, error %d\n",
	256	__func__, result);
	257	/* don't have to grab the lock here, as we will
	258	retry if != 0 */
507ca9bc GKH	259	port->write_urb_busy = 0;
507ca9bc GKH	260	} else
1da177e4 LT	261	result = count;
	262
	263	return result;
	264	}
	265
	266	/* no bulk out, so return 0 bytes written */
507ca9bc	267	return 0;
1da177e4 LT	268	}
1da177e4 LT	269
ae64387a	270	int usb_serial_generic_write_room(struct tty_struct *tty)
1da177e4	271	{
95da310e	272	struct usb_serial_port *port = tty->driver_data;
1da177e4 LT	273	struct usb_serial *serial = port->serial;
	274	int room = 0;
	275
441b62c1	276	dbg("%s - port %d", __func__, port->number);
507ca9bc	277
a5b6f60c	278	/* FIXME: Locking */
1da177e4	279	if (serial->num_bulk_out) {
7a3ca7d2	280	if (!(port->write_urb_busy))
1da177e4 LT	281	room = port->bulk_out_size;
	282	}
	283
441b62c1	284	dbg("%s - returns %d", __func__, room);
a5b6f60c	285	return room;
1da177e4 LT	286	}
1da177e4 LT	287
95da310e	288	int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
1da177e4	289	{
95da310e	290	struct usb_serial_port *port = tty->driver_data;
1da177e4 LT	291	struct usb_serial *serial = port->serial;
	292	int chars = 0;
	293
441b62c1	294	dbg("%s - port %d", __func__, port->number);
1da177e4	295
a5b6f60c	296	/* FIXME: Locking */
1da177e4	297	if (serial->num_bulk_out) {
507ca9bc	298	if (port->write_urb_busy)
1da177e4 LT	299	chars = port->write_urb->transfer_buffer_length;
	300	}
	301
441b62c1	302	dbg("%s - returns %d", __func__, chars);
95da310e	303	return chars;
1da177e4 LT	304	}
1da177e4 LT	305
1abdeeb1 ON	306
1abdeeb1 ON	307	static void resubmit_read_urb(struct usb_serial_port *port, gfp_t mem_flags)
1da177e4	308	{
253ca923	309	struct urb *urb = port->read_urb;
1abdeeb1	310	struct usb_serial *serial = port->serial;
1da177e4 LT	311	int result;
1da177e4 LT	312
253ca923	313	/* Continue reading from device */
ae64387a AC	314	usb_fill_bulk_urb(urb, serial->dev,
	315	usb_rcvbulkpipe(serial->dev,
	316	port->bulk_in_endpointAddress),
1abdeeb1 ON	317	urb->transfer_buffer,
1abdeeb1 ON	318	urb->transfer_buffer_length,
ae64387a AC	319	((serial->type->read_bulk_callback) ?
ae64387a AC	320	serial->type->read_bulk_callback :
1da177e4	321	usb_serial_generic_read_bulk_callback), port);
1abdeeb1	322	result = usb_submit_urb(urb, mem_flags);
1da177e4	323	if (result)
ae64387a AC	324	dev_err(&port->dev,
	325	"%s - failed resubmitting read urb, error %d\n",
	326	__func__, result);
1da177e4	327	}
253ca923	328
1abdeeb1	329	/* Push data to tty layer and resubmit the bulk read URB */
95da310e	330	static void flush_and_resubmit_read_urb(struct usb_serial_port *port)
1abdeeb1 ON	331	{
1abdeeb1 ON	332	struct urb *urb = port->read_urb;
4a90f09b	333	struct tty_struct *tty = tty_port_tty_get(&port->port);
1abdeeb1 ON	334	int room;
	335
	336	/* Push data to tty */
	337	if (tty && urb->actual_length) {
	338	room = tty_buffer_request_room(tty, urb->actual_length);
	339	if (room) {
	340	tty_insert_flip_string(tty, urb->transfer_buffer, room);
b507cc97	341	tty_flip_buffer_push(tty);
1abdeeb1 ON	342	}
1abdeeb1 ON	343	}
4a90f09b	344	tty_kref_put(tty);
1abdeeb1 ON	345
	346	resubmit_read_urb(port, GFP_ATOMIC);
	347	}
	348
95da310e	349	void usb_serial_generic_read_bulk_callback(struct urb *urb)
253ca923	350	{
cdc97792	351	struct usb_serial_port *port = urb->context;
253ca923	352	unsigned char *data = urb->transfer_buffer;
fbd27225	353	int status = urb->status;
bfaeafcf	354	unsigned long flags;
253ca923	355
441b62c1	356	dbg("%s - port %d", __func__, port->number);
253ca923	357
fbd27225 GKH	358	if (unlikely(status != 0)) {
fbd27225 GKH	359	dbg("%s - nonzero read bulk status received: %d",
441b62c1	360	__func__, status);
253ca923 JR	361	return;
	362	}
	363
ae64387a AC	364	usb_serial_debug_data(debug, &port->dev, __func__,
ae64387a AC	365	urb->actual_length, data);
253ca923 JR	366
253ca923 JR	367	/* Throttle the device if requested by tty */
bfaeafcf	368	spin_lock_irqsave(&port->lock, flags);
ae64387a AC	369	port->throttled = port->throttle_req;
ae64387a AC	370	if (!port->throttled) {
b507cc97	371	spin_unlock_irqrestore(&port->lock, flags);
1abdeeb1	372	flush_and_resubmit_read_urb(port);
ae64387a	373	} else
b507cc97	374	spin_unlock_irqrestore(&port->lock, flags);
253ca923	375	}
166ffccf	376	EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);
1da177e4	377
95da310e	378	void usb_serial_generic_write_bulk_callback(struct urb *urb)
1da177e4	379	{
cdc97792	380	struct usb_serial_port *port = urb->context;
fbd27225	381	int status = urb->status;
1da177e4	382
441b62c1	383	dbg("%s - port %d", __func__, port->number);
1da177e4	384
507ca9bc	385	port->write_urb_busy = 0;
fbd27225 GKH	386	if (status) {
fbd27225 GKH	387	dbg("%s - nonzero write bulk status received: %d",
441b62c1	388	__func__, status);
1da177e4 LT	389	return;
1da177e4 LT	390	}
cf2c7481	391	usb_serial_port_softint(port);
1da177e4	392	}
bb833986	393	EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback);
1da177e4	394
95da310e	395	void usb_serial_generic_throttle(struct tty_struct *tty)
253ca923	396	{
95da310e	397	struct usb_serial_port *port = tty->driver_data;
253ca923 JR	398	unsigned long flags;
253ca923 JR	399
441b62c1	400	dbg("%s - port %d", __func__, port->number);
253ca923 JR	401
	402	/* Set the throttle request flag. It will be picked up
	403	* by usb_serial_generic_read_bulk_callback(). */
	404	spin_lock_irqsave(&port->lock, flags);
	405	port->throttle_req = 1;
	406	spin_unlock_irqrestore(&port->lock, flags);
	407	}
	408
95da310e	409	void usb_serial_generic_unthrottle(struct tty_struct *tty)
253ca923	410	{
95da310e	411	struct usb_serial_port *port = tty->driver_data;
253ca923 JR	412	int was_throttled;
	413	unsigned long flags;
	414
441b62c1	415	dbg("%s - port %d", __func__, port->number);
253ca923 JR	416
	417	/* Clear the throttle flags */
	418	spin_lock_irqsave(&port->lock, flags);
	419	was_throttled = port->throttled;
	420	port->throttled = port->throttle_req = 0;
	421	spin_unlock_irqrestore(&port->lock, flags);
	422
	423	if (was_throttled) {
1abdeeb1 ON	424	/* Resume reading from device */
1abdeeb1 ON	425	resubmit_read_urb(port, GFP_KERNEL);
253ca923 JR	426	}
	427	}
	428
ae64387a	429	void usb_serial_generic_shutdown(struct usb_serial *serial)
1da177e4 LT	430	{
	431	int i;
	432
441b62c1	433	dbg("%s", __func__);
1da177e4 LT	434
1da177e4 LT	435	/* stop reads and writes on all ports */
ae64387a	436	for (i = 0; i < serial->num_ports; ++i)
1da177e4	437	generic_cleanup(serial->port[i]);
1da177e4 LT	438	}
1da177e4 LT	439