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

// SPDX-License-Identifier: GPL-2.0
/*
 * Opticon USB barcode to serial driver
 *
 * Copyright (C) 2011 - 2012 Johan Hovold <jhovold@gmail.com>
 * Copyright (C) 2011 Martin Jansen <martin.jansen@opticon.com>
 * Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@suse.de>
 * Copyright (C) 2008 - 2009 Novell Inc.
 */

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

#define CONTROL_RTS			0x02
#define RESEND_CTS_STATE	0x03

/* max number of write urbs in flight */
#define URB_UPPER_LIMIT	8

/* This driver works for the Opticon 1D barcode reader
 * an examples of 1D barcode types are EAN, UPC, Code39, IATA etc.. */
#define DRIVER_DESC	"Opticon USB barcode to serial driver (1D)"

static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(0x065a, 0x0009) },
	{ },
};
MODULE_DEVICE_TABLE(usb, id_table);

/* This structure holds all of the individual device information */
struct opticon_private {
	spinlock_t lock;	/* protects the following flags */
	bool rts;
	bool cts;
	int outstanding_urbs;
};


static void opticon_process_data_packet(struct usb_serial_port *port,
					const unsigned char *buf, size_t len)
{
	tty_insert_flip_string(&port->port, buf, len);
	tty_flip_buffer_push(&port->port);
}

static void opticon_process_status_packet(struct usb_serial_port *port,
					const unsigned char *buf, size_t len)
{
	struct opticon_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	if (buf[0] == 0x00)
		priv->cts = false;
	else
		priv->cts = true;
	spin_unlock_irqrestore(&priv->lock, flags);
}

static void opticon_process_read_urb(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	const unsigned char *hdr = urb->transfer_buffer;
	const unsigned char *data = hdr + 2;
	size_t data_len = urb->actual_length - 2;

	if (urb->actual_length <= 2) {
		dev_dbg(&port->dev, "malformed packet received: %d bytes\n",
							urb->actual_length);
		return;
	}
	/*
	 * Data from the device comes with a 2 byte header:
	 *
	 * <0x00><0x00>data...
	 *      This is real data to be sent to the tty layer
	 * <0x00><0x01>level
	 *      This is a CTS level change, the third byte is the CTS
	 *      value (0 for low, 1 for high).
	 */
	if ((hdr[0] == 0x00) && (hdr[1] == 0x00)) {
		opticon_process_data_packet(port, data, data_len);
	} else if ((hdr[0] == 0x00) && (hdr[1] == 0x01)) {
		opticon_process_status_packet(port, data, data_len);
	} else {
		dev_dbg(&port->dev, "unknown packet received: %02x %02x\n",
							hdr[0], hdr[1]);
	}
}

static int send_control_msg(struct usb_serial_port *port, u8 requesttype,
				u8 val)
{
	struct usb_serial *serial = port->serial;
	int retval;
	u8 *buffer;

	buffer = kzalloc(1, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	buffer[0] = val;
	/* Send the message to the vendor control endpoint
	 * of the connected device */
	retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
				requesttype,
				USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
				0, 0, buffer, 1, 0);
	kfree(buffer);

	if (retval < 0)
		return retval;

	return 0;
}

static int opticon_open(struct tty_struct *tty, struct usb_serial_port *port)
{
	struct opticon_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	int res;

	spin_lock_irqsave(&priv->lock, flags);
	priv->rts = false;
	spin_unlock_irqrestore(&priv->lock, flags);

	/* Clear RTS line */
	send_control_msg(port, CONTROL_RTS, 0);

	/* clear the halt status of the endpoint */
	usb_clear_halt(port->serial->dev, port->read_urb->pipe);

	res = usb_serial_generic_open(tty, port);
	if (res)
		return res;

	/* Request CTS line state, sometimes during opening the current
	 * CTS state can be missed. */
	send_control_msg(port, RESEND_CTS_STATE, 1);

	return res;
}

static void opticon_write_control_callback(struct urb *urb)
{
	struct usb_serial_port *port = urb->context;
	struct opticon_private *priv = usb_get_serial_port_data(port);
	int status = urb->status;
	unsigned long flags;

	/* free up the transfer buffer, as usb_free_urb() does not do this */
	kfree(urb->transfer_buffer);

	/* setup packet may be set if we're using it for writing */
	kfree(urb->setup_packet);

	if (status)
		dev_dbg(&port->dev,
			"%s - non-zero urb status received: %d\n",
			__func__, status);

	spin_lock_irqsave(&priv->lock, flags);
	--priv->outstanding_urbs;
	spin_unlock_irqrestore(&priv->lock, flags);

	usb_serial_port_softint(port);
}

static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
			 const unsigned char *buf, int count)
{
	struct opticon_private *priv = usb_get_serial_port_data(port);
	struct usb_serial *serial = port->serial;
	struct urb *urb;
	unsigned char *buffer;
	unsigned long flags;
	int status;
	struct usb_ctrlrequest *dr;

	spin_lock_irqsave(&priv->lock, flags);
	if (priv->outstanding_urbs > URB_UPPER_LIMIT) {
		spin_unlock_irqrestore(&priv->lock, flags);
		dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
		return 0;
	}
	priv->outstanding_urbs++;
	spin_unlock_irqrestore(&priv->lock, flags);

	buffer = kmalloc(count, GFP_ATOMIC);
	if (!buffer) {
		count = -ENOMEM;
		goto error_no_buffer;
	}

	urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!urb) {
		count = -ENOMEM;
		goto error_no_urb;
	}

	memcpy(buffer, buf, count);

	usb_serial_debug_data(&port->dev, __func__, count, buffer);

	/* The connected devices do not have a bulk write endpoint,
	 * to transmit data to de barcode device the control endpoint is used */
	dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
	if (!dr) {
		count = -ENOMEM;
		goto error_no_dr;
	}

	dr->bRequestType = USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT;
	dr->bRequest = 0x01;
	dr->wValue = 0;
	dr->wIndex = 0;
	dr->wLength = cpu_to_le16(count);

	usb_fill_control_urb(urb, serial->dev,
		usb_sndctrlpipe(serial->dev, 0),
		(unsigned char *)dr, buffer, count,
		opticon_write_control_callback, port);

	/* send it down the pipe */
	status = usb_submit_urb(urb, GFP_ATOMIC);
	if (status) {
		dev_err(&port->dev,
		"%s - usb_submit_urb(write endpoint) failed status = %d\n",
							__func__, status);
		count = status;
		goto error;
	}

	/* we are done with this urb, so let the host driver
	 * really free it when it is finished with it */
	usb_free_urb(urb);

	return count;
error:
	kfree(dr);
error_no_dr:
	usb_free_urb(urb);
error_no_urb:
	kfree(buffer);
error_no_buffer:
	spin_lock_irqsave(&priv->lock, flags);
	--priv->outstanding_urbs;
	spin_unlock_irqrestore(&priv->lock, flags);
	return count;
}

static int opticon_write_room(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct opticon_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;

	/*
	 * We really can take almost anything the user throws at us
	 * but let's pick a nice big number to tell the tty
	 * layer that we have lots of free space, unless we don't.
	 */
	spin_lock_irqsave(&priv->lock, flags);
	if (priv->outstanding_urbs > URB_UPPER_LIMIT * 2 / 3) {
		spin_unlock_irqrestore(&priv->lock, flags);
		dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
		return 0;
	}
	spin_unlock_irqrestore(&priv->lock, flags);

	return 2048;
}

static int opticon_tiocmget(struct tty_struct *tty)
{
	struct usb_serial_port *port = tty->driver_data;
	struct opticon_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	int result = 0;

	spin_lock_irqsave(&priv->lock, flags);
	if (priv->rts)
		result |= TIOCM_RTS;
	if (priv->cts)
		result |= TIOCM_CTS;
	spin_unlock_irqrestore(&priv->lock, flags);

	dev_dbg(&port->dev, "%s - %x\n", __func__, result);
	return result;
}

static int opticon_tiocmset(struct tty_struct *tty,
			   unsigned int set, unsigned int clear)
{
	struct usb_serial_port *port = tty->driver_data;
	struct opticon_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	bool rts;
	bool changed = false;
	int ret;

	/* We only support RTS so we only handle that */
	spin_lock_irqsave(&priv->lock, flags);

	rts = priv->rts;
	if (set & TIOCM_RTS)
		priv->rts = true;
	if (clear & TIOCM_RTS)
		priv->rts = false;
	changed = rts ^ priv->rts;
	spin_unlock_irqrestore(&priv->lock, flags);

	if (!changed)
		return 0;

	ret = send_control_msg(port, CONTROL_RTS, !rts);
	if (ret)
		return usb_translate_errors(ret);

	return 0;
}

static int get_serial_info(struct usb_serial_port *port,
			   struct serial_struct __user *serial)
{
	struct serial_struct tmp;

	memset(&tmp, 0x00, sizeof(tmp));

	/* fake emulate a 16550 uart to make userspace code happy */
	tmp.type		= PORT_16550A;
	tmp.line		= port->minor;
	tmp.port		= 0;
	tmp.irq			= 0;
	tmp.xmit_fifo_size	= 1024;
	tmp.baud_base		= 9600;
	tmp.close_delay		= 5*HZ;
	tmp.closing_wait	= 30*HZ;

	if (copy_to_user(serial, &tmp, sizeof(*serial)))
		return -EFAULT;
	return 0;
}

static int opticon_ioctl(struct tty_struct *tty,
			 unsigned int cmd, unsigned long arg)
{
	struct usb_serial_port *port = tty->driver_data;

	switch (cmd) {
	case TIOCGSERIAL:
		return get_serial_info(port,
				       (struct serial_struct __user *)arg);
	}

	return -ENOIOCTLCMD;
}

static int opticon_port_probe(struct usb_serial_port *port)
{
	struct opticon_private *priv;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	spin_lock_init(&priv->lock);

	usb_set_serial_port_data(port, priv);

	return 0;
}

static int opticon_port_remove(struct usb_serial_port *port)
{
	struct opticon_private *priv = usb_get_serial_port_data(port);

	kfree(priv);

	return 0;
}

static struct usb_serial_driver opticon_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"opticon",
	},
	.id_table =		id_table,
	.num_ports =		1,
	.num_bulk_in =		1,
	.bulk_in_size =		256,
	.port_probe =		opticon_port_probe,
	.port_remove =		opticon_port_remove,
	.open =			opticon_open,
	.write =		opticon_write,
	.write_room = 		opticon_write_room,
	.throttle =		usb_serial_generic_throttle,
	.unthrottle =		usb_serial_generic_unthrottle,
	.ioctl =		opticon_ioctl,
	.tiocmget =		opticon_tiocmget,
	.tiocmset =		opticon_tiocmset,
	.process_read_urb =	opticon_process_read_urb,
};

static struct usb_serial_driver * const serial_drivers[] = {
	&opticon_device, NULL
};

module_usb_serial_driver(serial_drivers, id_table);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL v2");
Commit	Line	Data
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0
57262b82 GKH	2	/*
	3	* Opticon USB barcode to serial driver
	4	*
7a6ee2b0	5	* Copyright (C) 2011 - 2012 Johan Hovold <jhovold@gmail.com>
309a0579	6	* Copyright (C) 2011 Martin Jansen <martin.jansen@opticon.com>
648d4e16 GKH	7	* Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@suse.de>
648d4e16 GKH	8	* Copyright (C) 2008 - 2009 Novell Inc.
57262b82 GKH	9	*/
	10
	11	#include <linux/kernel.h>
57262b82 GKH	12	#include <linux/tty.h>
57262b82 GKH	13	#include <linux/tty_driver.h>
5a0e3ad6	14	#include <linux/slab.h>
57262b82	15	#include <linux/tty_flip.h>
faac64ad	16	#include <linux/serial.h>
57262b82 GKH	17	#include <linux/module.h>
	18	#include <linux/usb.h>
	19	#include <linux/usb/serial.h>
	20	#include <linux/uaccess.h>
	21
309a0579 MJ	22	#define CONTROL_RTS 0x02
	23	#define RESEND_CTS_STATE 0x03
	24
	25	/* max number of write urbs in flight */
	26	#define URB_UPPER_LIMIT 8
	27
	28	/* This driver works for the Opticon 1D barcode reader
	29	* an examples of 1D barcode types are EAN, UPC, Code39, IATA etc.. */
	30	#define DRIVER_DESC "Opticon USB barcode to serial driver (1D)"
	31
7d40d7e8	32	static const struct usb_device_id id_table[] = {
57262b82 GKH	33	{ USB_DEVICE(0x065a, 0x0009) },
	34	{ },
	35	};
	36	MODULE_DEVICE_TABLE(usb, id_table);
	37
	38	/* This structure holds all of the individual device information */
	39	struct opticon_private {
57262b82	40	spinlock_t lock; /* protects the following flags */
57262b82	41	bool rts;
309a0579	42	bool cts;
648d4e16	43	int outstanding_urbs;
57262b82 GKH	44	};
57262b82 GKH	45
648d4e16	46
32802077 JH	47	static void opticon_process_data_packet(struct usb_serial_port *port,
	48	const unsigned char *buf, size_t len)
	49	{
05c7cd39	50	tty_insert_flip_string(&port->port, buf, len);
2e124b4a	51	tty_flip_buffer_push(&port->port);
32802077 JH	52	}
	53
	54	static void opticon_process_status_packet(struct usb_serial_port *port,
	55	const unsigned char *buf, size_t len)
	56	{
	57	struct opticon_private *priv = usb_get_serial_port_data(port);
	58	unsigned long flags;
	59
	60	spin_lock_irqsave(&priv->lock, flags);
	61	if (buf[0] == 0x00)
	62	priv->cts = false;
	63	else
	64	priv->cts = true;
	65	spin_unlock_irqrestore(&priv->lock, flags);
	66	}
	67
	68	static void opticon_process_read_urb(struct urb *urb)
	69	{
	70	struct usb_serial_port *port = urb->context;
	71	const unsigned char *hdr = urb->transfer_buffer;
	72	const unsigned char *data = hdr + 2;
	73	size_t data_len = urb->actual_length - 2;
	74
	75	if (urb->actual_length <= 2) {
	76	dev_dbg(&port->dev, "malformed packet received: %d bytes\n",
	77	urb->actual_length);
	78	return;
	79	}
	80	/*
	81	* Data from the device comes with a 2 byte header:
	82	*
	83	* <0x00><0x00>data...
	84	* This is real data to be sent to the tty layer
	85	* <0x00><0x01>level
	86	* This is a CTS level change, the third byte is the CTS
	87	* value (0 for low, 1 for high).
	88	*/
	89	if ((hdr[0] == 0x00) && (hdr[1] == 0x00)) {
	90	opticon_process_data_packet(port, data, data_len);
	91	} else if ((hdr[0] == 0x00) && (hdr[1] == 0x01)) {
	92	opticon_process_status_packet(port, data, data_len);
	93	} else {
	94	dev_dbg(&port->dev, "unknown packet received: %02x %02x\n",
	95	hdr[0], hdr[1]);
	96	}
	97	}
309a0579	98
309a0579 MJ	99	static int send_control_msg(struct usb_serial_port *port, u8 requesttype,
	100	u8 val)
	101	{
	102	struct usb_serial *serial = port->serial;
	103	int retval;
ea0dbebf JH	104	u8 *buffer;
	105
	106	buffer = kzalloc(1, GFP_KERNEL);
	107	if (!buffer)
	108	return -ENOMEM;
309a0579 MJ	109
	110	buffer[0] = val;
	111	/* Send the message to the vendor control endpoint
	112	* of the connected device */
	113	retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
	114	requesttype,
	115	USB_DIR_OUT\|USB_TYPE_VENDOR\|USB_RECIP_INTERFACE,
	116	0, 0, buffer, 1, 0);
ea0dbebf	117	kfree(buffer);
309a0579	118
94c51dca JH	119	if (retval < 0)
	120	return retval;
	121
	122	return 0;
309a0579 MJ	123	}
309a0579 MJ	124
a509a7e4	125	static int opticon_open(struct tty_struct tty, struct usb_serial_port port)
57262b82	126	{
70d25eee	127	struct opticon_private *priv = usb_get_serial_port_data(port);
57262b82	128	unsigned long flags;
7a6ee2b0	129	int res;
57262b82	130
57262b82	131	spin_lock_irqsave(&priv->lock, flags);
309a0579	132	priv->rts = false;
57262b82 GKH	133	spin_unlock_irqrestore(&priv->lock, flags);
57262b82 GKH	134
309a0579 MJ	135	/* Clear RTS line */
	136	send_control_msg(port, CONTROL_RTS, 0);
	137
cd8c5053	138	/* clear the halt status of the endpoint */
7a6ee2b0 JH	139	usb_clear_halt(port->serial->dev, port->read_urb->pipe);
	140
	141	res = usb_serial_generic_open(tty, port);
2eee0502	142	if (res)
7a6ee2b0	143	return res;
309a0579	144
309a0579 MJ	145	/* Request CTS line state, sometimes during opening the current
	146	* CTS state can be missed. */
	147	send_control_msg(port, RESEND_CTS_STATE, 1);
57262b82	148
7a6ee2b0	149	return res;
57262b82 GKH	150	}
57262b82 GKH	151
309a0579	152	static void opticon_write_control_callback(struct urb *urb)
648d4e16	153	{
e32d82bc JH	154	struct usb_serial_port *port = urb->context;
e32d82bc JH	155	struct opticon_private *priv = usb_get_serial_port_data(port);
648d4e16 GKH	156	int status = urb->status;
	157	unsigned long flags;
	158
	159	/* free up the transfer buffer, as usb_free_urb() does not do this */
	160	kfree(urb->transfer_buffer);
	161
0d930e51 AZ	162	/* setup packet may be set if we're using it for writing */
	163	kfree(urb->setup_packet);
	164
648d4e16	165	if (status)
e32d82bc	166	dev_dbg(&port->dev,
e29a7738	167	"%s - non-zero urb status received: %d\n",
d44d9ab7	168	__func__, status);
648d4e16 GKH	169
	170	spin_lock_irqsave(&priv->lock, flags);
	171	--priv->outstanding_urbs;
	172	spin_unlock_irqrestore(&priv->lock, flags);
	173
e32d82bc	174	usb_serial_port_softint(port);
648d4e16 GKH	175	}
	176
	177	static int opticon_write(struct tty_struct tty, struct usb_serial_port port,
	178	const unsigned char *buf, int count)
	179	{
70d25eee	180	struct opticon_private *priv = usb_get_serial_port_data(port);
648d4e16 GKH	181	struct usb_serial *serial = port->serial;
	182	struct urb *urb;
	183	unsigned char *buffer;
	184	unsigned long flags;
	185	int status;
309a0579	186	struct usb_ctrlrequest *dr;
648d4e16	187
648d4e16 GKH	188	spin_lock_irqsave(&priv->lock, flags);
	189	if (priv->outstanding_urbs > URB_UPPER_LIMIT) {
	190	spin_unlock_irqrestore(&priv->lock, flags);
d44d9ab7	191	dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
648d4e16 GKH	192	return 0;
	193	}
	194	priv->outstanding_urbs++;
	195	spin_unlock_irqrestore(&priv->lock, flags);
	196
	197	buffer = kmalloc(count, GFP_ATOMIC);
	198	if (!buffer) {
648d4e16 GKH	199	count = -ENOMEM;
	200	goto error_no_buffer;
	201	}
	202
	203	urb = usb_alloc_urb(0, GFP_ATOMIC);
	204	if (!urb) {
648d4e16 GKH	205	count = -ENOMEM;
	206	goto error_no_urb;
	207	}
	208
	209	memcpy(buffer, buf, count);
	210
59d33f2f	211	usb_serial_debug_data(&port->dev, __func__, count, buffer);
648d4e16	212
cd8c5053	213	/* The connected devices do not have a bulk write endpoint,
309a0579	214	* to transmit data to de barcode device the control endpoint is used */
e681286d	215	dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
b0795bbf	216	if (!dr) {
b0795bbf	217	count = -ENOMEM;
acbf0e52	218	goto error_no_dr;
b0795bbf	219	}
309a0579 MJ	220
	221	dr->bRequestType = USB_TYPE_VENDOR \| USB_RECIP_INTERFACE \| USB_DIR_OUT;
	222	dr->bRequest = 0x01;
	223	dr->wValue = 0;
	224	dr->wIndex = 0;
	225	dr->wLength = cpu_to_le16(count);
	226
	227	usb_fill_control_urb(urb, serial->dev,
	228	usb_sndctrlpipe(serial->dev, 0),
	229	(unsigned char *)dr, buffer, count,
e32d82bc	230	opticon_write_control_callback, port);
648d4e16 GKH	231
	232	/* send it down the pipe */
	233	status = usb_submit_urb(urb, GFP_ATOMIC);
	234	if (status) {
	235	dev_err(&port->dev,
309a0579	236	"%s - usb_submit_urb(write endpoint) failed status = %d\n",
648d4e16 GKH	237	__func__, status);
	238	count = status;
	239	goto error;
	240	}
	241
	242	/* we are done with this urb, so let the host driver
	243	* really free it when it is finished with it */
	244	usb_free_urb(urb);
	245
	246	return count;
	247	error:
acbf0e52 JH	248	kfree(dr);
acbf0e52 JH	249	error_no_dr:
648d4e16 GKH	250	usb_free_urb(urb);
	251	error_no_urb:
	252	kfree(buffer);
	253	error_no_buffer:
	254	spin_lock_irqsave(&priv->lock, flags);
	255	--priv->outstanding_urbs;
	256	spin_unlock_irqrestore(&priv->lock, flags);
	257	return count;
	258	}
	259
	260	static int opticon_write_room(struct tty_struct *tty)
	261	{
	262	struct usb_serial_port *port = tty->driver_data;
70d25eee	263	struct opticon_private *priv = usb_get_serial_port_data(port);
648d4e16 GKH	264	unsigned long flags;
648d4e16 GKH	265
648d4e16 GKH	266	/*
	267	* We really can take almost anything the user throws at us
	268	* but let's pick a nice big number to tell the tty
	269	* layer that we have lots of free space, unless we don't.
	270	*/
	271	spin_lock_irqsave(&priv->lock, flags);
	272	if (priv->outstanding_urbs > URB_UPPER_LIMIT * 2 / 3) {
	273	spin_unlock_irqrestore(&priv->lock, flags);
d44d9ab7	274	dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
648d4e16 GKH	275	return 0;
	276	}
	277	spin_unlock_irqrestore(&priv->lock, flags);
	278
	279	return 2048;
	280	}
	281
60b33c13	282	static int opticon_tiocmget(struct tty_struct *tty)
faac64ad GKH	283	{
faac64ad GKH	284	struct usb_serial_port *port = tty->driver_data;
70d25eee	285	struct opticon_private *priv = usb_get_serial_port_data(port);
faac64ad GKH	286	unsigned long flags;
	287	int result = 0;
	288
faac64ad GKH	289	spin_lock_irqsave(&priv->lock, flags);
faac64ad GKH	290	if (priv->rts)
309a0579 MJ	291	result \|= TIOCM_RTS;
	292	if (priv->cts)
	293	result \|= TIOCM_CTS;
faac64ad GKH	294	spin_unlock_irqrestore(&priv->lock, flags);
faac64ad GKH	295
d44d9ab7	296	dev_dbg(&port->dev, "%s - %x\n", __func__, result);
faac64ad GKH	297	return result;
	298	}
	299
4acfaf82	300	static int opticon_tiocmset(struct tty_struct *tty,
309a0579 MJ	301	unsigned int set, unsigned int clear)
	302	{
	303	struct usb_serial_port *port = tty->driver_data;
70d25eee	304	struct opticon_private *priv = usb_get_serial_port_data(port);
309a0579 MJ	305	unsigned long flags;
	306	bool rts;
	307	bool changed = false;
81d5a672	308	int ret;
309a0579	309
309a0579 MJ	310	/* We only support RTS so we only handle that */
	311	spin_lock_irqsave(&priv->lock, flags);
	312
	313	rts = priv->rts;
	314	if (set & TIOCM_RTS)
	315	priv->rts = true;
	316	if (clear & TIOCM_RTS)
	317	priv->rts = false;
	318	changed = rts ^ priv->rts;
	319	spin_unlock_irqrestore(&priv->lock, flags);
	320
	321	if (!changed)
	322	return 0;
	323
94bcef62 JH	324	ret = send_control_msg(port, CONTROL_RTS, !rts);
	325	if (ret)
	326	return usb_translate_errors(ret);
81d5a672	327
94bcef62	328	return 0;
309a0579 MJ	329	}
309a0579 MJ	330
56be1a17	331	static int get_serial_info(struct usb_serial_port *port,
faac64ad GKH	332	struct serial_struct __user *serial)
	333	{
	334	struct serial_struct tmp;
	335
faac64ad GKH	336	memset(&tmp, 0x00, sizeof(tmp));
	337
	338	/* fake emulate a 16550 uart to make userspace code happy */
	339	tmp.type = PORT_16550A;
e5b1e206	340	tmp.line = port->minor;
faac64ad GKH	341	tmp.port = 0;
faac64ad GKH	342	tmp.irq = 0;
faac64ad GKH	343	tmp.xmit_fifo_size = 1024;
	344	tmp.baud_base = 9600;
	345	tmp.close_delay = 5*HZ;
	346	tmp.closing_wait = 30*HZ;
	347
	348	if (copy_to_user(serial, &tmp, sizeof(*serial)))
	349	return -EFAULT;
	350	return 0;
	351	}
	352
00a0d0d6	353	static int opticon_ioctl(struct tty_struct *tty,
faac64ad GKH	354	unsigned int cmd, unsigned long arg)
	355	{
	356	struct usb_serial_port *port = tty->driver_data;
faac64ad	357
faac64ad GKH	358	switch (cmd) {
faac64ad GKH	359	case TIOCGSERIAL:
56be1a17	360	return get_serial_info(port,
faac64ad GKH	361	(struct serial_struct __user *)arg);
	362	}
	363
	364	return -ENOIOCTLCMD;
	365	}
	366
70d25eee JH	367	static int opticon_port_probe(struct usb_serial_port *port)
70d25eee JH	368	{
70d25eee	369	struct opticon_private *priv;
70d25eee	370
57262b82	371	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
70d25eee	372	if (!priv)
57262b82	373	return -ENOMEM;
70d25eee	374
57262b82	375	spin_lock_init(&priv->lock);
0b8718a2	376
70d25eee	377	usb_set_serial_port_data(port, priv);
57262b82	378
70d25eee	379	return 0;
57262b82 GKH	380	}
57262b82 GKH	381
70d25eee	382	static int opticon_port_remove(struct usb_serial_port *port)
f9c99bb8	383	{
70d25eee	384	struct opticon_private *priv = usb_get_serial_port_data(port);
f9c99bb8	385
57262b82	386	kfree(priv);
70d25eee JH	387
70d25eee JH	388	return 0;
57262b82 GKH	389	}
57262b82 GKH	390
57262b82 GKH	391	static struct usb_serial_driver opticon_device = {
	392	.driver = {
	393	.owner = THIS_MODULE,
	394	.name = "opticon",
	395	},
	396	.id_table = id_table,
57262b82	397	.num_ports = 1,
5e5b6444	398	.num_bulk_in = 1,
333396fc	399	.bulk_in_size = 256,
70d25eee JH	400	.port_probe = opticon_port_probe,
70d25eee JH	401	.port_remove = opticon_port_remove,
57262b82	402	.open = opticon_open,
648d4e16 GKH	403	.write = opticon_write,
648d4e16 GKH	404	.write_room = opticon_write_room,
7a6ee2b0 JH	405	.throttle = usb_serial_generic_throttle,
7a6ee2b0 JH	406	.unthrottle = usb_serial_generic_unthrottle,
faac64ad GKH	407	.ioctl = opticon_ioctl,
faac64ad GKH	408	.tiocmget = opticon_tiocmget,
309a0579	409	.tiocmset = opticon_tiocmset,
7a6ee2b0	410	.process_read_urb = opticon_process_read_urb,
57262b82 GKH	411	};
57262b82 GKH	412
f667ddad AS	413	static struct usb_serial_driver * const serial_drivers[] = {
	414	&opticon_device, NULL
	415	};
	416
68e24113	417	module_usb_serial_driver(serial_drivers, id_table);
57262b82	418
309a0579	419	MODULE_DESCRIPTION(DRIVER_DESC);
627cfa89	420	MODULE_LICENSE("GPL v2");