USB: opticon: add rts and cts support (309a0579) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/usb/serial/opticon.c

+112 −44

Original line number	Original line	Diff line number	Diff line
	/*		/*
	* Opticon USB barcode to serial driver		* Opticon USB barcode to serial driver
	*		*
			* Copyright (C) 2011 Martin Jansen <martin.jansen@opticon.com>
	* Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@suse.de>		* Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@suse.de>
	* Copyright (C) 2008 - 2009 Novell Inc.		* Copyright (C) 2008 - 2009 Novell Inc.
	*		*
	@@ -21,6 +22,16 @@
	#include <linux/usb/serial.h>		#include <linux/usb/serial.h>
	#include <linux/uaccess.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 int debug;		static int debug;

	static const struct usb_device_id id_table[] = {		static const struct usb_device_id id_table[] = {
	@@ -42,13 +53,13 @@ struct opticon_private {
	bool throttled;		bool throttled;
	bool actually_throttled;		bool actually_throttled;
	bool rts;		bool rts;
			bool cts;
	int outstanding_urbs;		int outstanding_urbs;
	};		};

	/* max number of write urbs in flight */
	#define URB_UPPER_LIMIT 4

	static void opticon_bulk_callback(struct urb *urb)
			static void opticon_read_bulk_callback(struct urb *urb)
	{		{
	struct opticon_private *priv = urb->context;		struct opticon_private *priv = urb->context;
	unsigned char *data = urb->transfer_buffer;		unsigned char *data = urb->transfer_buffer;
	@@ -57,6 +68,7 @@ static void opticon_bulk_callback(struct urb *urb)
	struct tty_struct *tty;		struct tty_struct *tty;
	int result;		int result;
	int data_length;		int data_length;
			unsigned long flags;

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

	@@ -89,7 +101,7 @@ static void opticon_bulk_callback(struct urb *urb)
	* <0x00><0x00>data...		* <0x00><0x00>data...
	* This is real data to be sent to the tty layer		* This is real data to be sent to the tty layer
	* <0x00><0x01)level		* <0x00><0x01)level
	* This is a RTS level change, the third byte is the RTS		* This is a CTS level change, the third byte is the CTS
	* value (0 for low, 1 for high).		* value (0 for low, 1 for high).
	*/		*/
	if ((data[0] == 0x00) && (data[1] == 0x00)) {		if ((data[0] == 0x00) && (data[1] == 0x00)) {
	@@ -103,10 +115,13 @@ static void opticon_bulk_callback(struct urb *urb)
	}		}
	} else {		} else {
	if ((data[0] == 0x00) && (data[1] == 0x01)) {		if ((data[0] == 0x00) && (data[1] == 0x01)) {
			spin_lock_irqsave(&priv->lock, flags);
			/* CTS status infomation package */
	if (data[2] == 0x00)		if (data[2] == 0x00)
	priv->rts = false;		priv->cts = false;
	else		else
	priv->rts = true;		priv->cts = true;
			spin_unlock_irqrestore(&priv->lock, flags);
	} else {		} else {
	dev_dbg(&priv->udev->dev,		dev_dbg(&priv->udev->dev,
	"Unknown data packet received from the device:"		"Unknown data packet received from the device:"
	@@ -129,7 +144,7 @@ exit:
	usb_rcvbulkpipe(priv->udev,		usb_rcvbulkpipe(priv->udev,
	priv->bulk_address),		priv->bulk_address),
	priv->bulk_in_buffer, priv->buffer_size,		priv->bulk_in_buffer, priv->buffer_size,
	opticon_bulk_callback, priv);		opticon_read_bulk_callback, priv);
	result = usb_submit_urb(priv->bulk_read_urb, GFP_ATOMIC);		result = usb_submit_urb(priv->bulk_read_urb, GFP_ATOMIC);
	if (result)		if (result)
	dev_err(&port->dev,		dev_err(&port->dev,
	@@ -140,6 +155,24 @@ exit:
	spin_unlock(&priv->lock);		spin_unlock(&priv->lock);
	}		}

			static int send_control_msg(struct usb_serial_port *port, u8 requesttype,
			u8 val)
			{
			struct usb_serial *serial = port->serial;
			int retval;
			u8 buffer[2];

			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);

			return retval;
			}

	static int opticon_open(struct tty_struct tty, struct usb_serial_port port)		static int opticon_open(struct tty_struct tty, struct usb_serial_port port)
	{		{
	struct opticon_private *priv = usb_get_serial_data(port->serial);		struct opticon_private *priv = usb_get_serial_data(port->serial);
	@@ -152,19 +185,30 @@ static int opticon_open(struct tty_struct tty, struct usb_serial_port port)
	priv->throttled = false;		priv->throttled = false;
	priv->actually_throttled = false;		priv->actually_throttled = false;
	priv->port = port;		priv->port = port;
			priv->rts = false;
	spin_unlock_irqrestore(&priv->lock, flags);		spin_unlock_irqrestore(&priv->lock, flags);

	/* Start reading from the device */		/* Clear RTS line */
			send_control_msg(port, CONTROL_RTS, 0);

			/* Setup the read URB and start reading from the device */
	usb_fill_bulk_urb(priv->bulk_read_urb, priv->udev,		usb_fill_bulk_urb(priv->bulk_read_urb, priv->udev,
	usb_rcvbulkpipe(priv->udev,		usb_rcvbulkpipe(priv->udev,
	priv->bulk_address),		priv->bulk_address),
	priv->bulk_in_buffer, priv->buffer_size,		priv->bulk_in_buffer, priv->buffer_size,
	opticon_bulk_callback, priv);		opticon_read_bulk_callback, priv);

			/* clear the halt status of the enpoint */
			usb_clear_halt(priv->udev, priv->bulk_read_urb->pipe);

	result = usb_submit_urb(priv->bulk_read_urb, GFP_KERNEL);		result = usb_submit_urb(priv->bulk_read_urb, GFP_KERNEL);
	if (result)		if (result)
	dev_err(&port->dev,		dev_err(&port->dev,
	"%s - failed resubmitting read urb, error %d\n",		"%s - failed resubmitting read urb, error %d\n",
	__func__, result);		__func__, result);
			/* Request CTS line state, sometimes during opening the current
			* CTS state can be missed. */
			send_control_msg(port, RESEND_CTS_STATE, 1);
	return result;		return result;
	}		}

	@@ -178,7 +222,7 @@ static void opticon_close(struct usb_serial_port *port)
	usb_kill_urb(priv->bulk_read_urb);		usb_kill_urb(priv->bulk_read_urb);
	}		}

	static void opticon_write_bulk_callback(struct urb *urb)		static void opticon_write_control_callback(struct urb *urb)
	{		{
	struct opticon_private *priv = urb->context;		struct opticon_private *priv = urb->context;
	int status = urb->status;		int status = urb->status;
	@@ -210,6 +254,7 @@ static int opticon_write(struct tty_struct tty, struct usb_serial_port port,
	unsigned char *buffer;		unsigned char *buffer;
	unsigned long flags;		unsigned long flags;
	int status;		int status;
			struct usb_ctrlrequest *dr;

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

	@@ -226,6 +271,7 @@ static int opticon_write(struct tty_struct tty, struct usb_serial_port port,
	if (!buffer) {		if (!buffer) {
	dev_err(&port->dev, "out of memory\n");		dev_err(&port->dev, "out of memory\n");
	count = -ENOMEM;		count = -ENOMEM;

	goto error_no_buffer;		goto error_no_buffer;
	}		}

	@@ -240,14 +286,8 @@ static int opticon_write(struct tty_struct tty, struct usb_serial_port port,

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

	if (port->bulk_out_endpointAddress) {		/* The conncected devices do not have a bulk write endpoint,
	usb_fill_bulk_urb(urb, serial->dev,		* to transmit data to de barcode device the control endpoint is used */
	usb_sndbulkpipe(serial->dev,
	port->bulk_out_endpointAddress),
	buffer, count, opticon_write_bulk_callback, priv);
	} else {
	struct usb_ctrlrequest *dr;

	dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);		dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
	if (!dr)		if (!dr)
	return -ENOMEM;		return -ENOMEM;
	@@ -261,14 +301,13 @@ static int opticon_write(struct tty_struct tty, struct usb_serial_port port,
	usb_fill_control_urb(urb, serial->dev,		usb_fill_control_urb(urb, serial->dev,
	usb_sndctrlpipe(serial->dev, 0),		usb_sndctrlpipe(serial->dev, 0),
	(unsigned char *)dr, buffer, count,		(unsigned char *)dr, buffer, count,
	opticon_write_bulk_callback, priv);		opticon_write_control_callback, priv);
	}

	/* send it down the pipe */		/* send it down the pipe */
	status = usb_submit_urb(urb, GFP_ATOMIC);		status = usb_submit_urb(urb, GFP_ATOMIC);
	if (status) {		if (status) {
	dev_err(&port->dev,		dev_err(&port->dev,
	"%s - usb_submit_urb(write bulk) failed with status = %d\n",		"%s - usb_submit_urb(write endpoint) failed status = %d\n",
	__func__, status);		__func__, status);
	count = status;		count = status;
	goto error;		goto error;
	@@ -360,16 +399,49 @@ static int opticon_tiocmget(struct tty_struct tty, struct file file)
	int result = 0;		int result = 0;

	dbg("%s - port %d", __func__, port->number);		dbg("%s - port %d", __func__, port->number);
			if (!usb_get_intfdata(port->serial->interface))
			return -ENODEV;

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

	dbg("%s - %x", __func__, result);		dbg("%s - %x", __func__, result);
	return result;		return result;
	}		}

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

			if (!usb_get_intfdata(port->serial->interface))
			return -ENODEV;
			/* 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;

			/* Send the new RTS state to the connected device */
			return send_control_msg(port, CONTROL_RTS, !rts);
			}

	static int get_serial_info(struct opticon_private *priv,		static int get_serial_info(struct opticon_private *priv,
	struct serial_struct __user *serial)		struct serial_struct __user *serial)
	{		{
	@@ -431,6 +503,7 @@ static int opticon_startup(struct usb_serial *serial)
	priv->serial = serial;		priv->serial = serial;
	priv->port = serial->port[0];		priv->port = serial->port[0];
	priv->udev = serial->dev;		priv->udev = serial->dev;
			priv->outstanding_urbs = 0; /* Init the outstanding urbs */

	/* find our bulk endpoint */		/* find our bulk endpoint */
	intf = serial->interface->altsetting;		intf = serial->interface->altsetting;
	@@ -456,13 +529,6 @@ static int opticon_startup(struct usb_serial *serial)

	priv->bulk_address = endpoint->bEndpointAddress;		priv->bulk_address = endpoint->bEndpointAddress;

	/* set up our bulk urb */
	usb_fill_bulk_urb(priv->bulk_read_urb, priv->udev,
	usb_rcvbulkpipe(priv->udev,
	endpoint->bEndpointAddress),
	priv->bulk_in_buffer, priv->buffer_size,
	opticon_bulk_callback, priv);

	bulk_in_found = true;		bulk_in_found = true;
	break;		break;
	}		}
	@@ -558,6 +624,7 @@ static struct usb_serial_driver opticon_device = {
	.unthrottle = opticon_unthrottle,		.unthrottle = opticon_unthrottle,
	.ioctl = opticon_ioctl,		.ioctl = opticon_ioctl,
	.tiocmget = opticon_tiocmget,		.tiocmget = opticon_tiocmget,
			.tiocmset = opticon_tiocmset,
	};		};

	static int __init opticon_init(void)		static int __init opticon_init(void)
	@@ -581,6 +648,7 @@ static void __exit opticon_exit(void)

	module_init(opticon_init);		module_init(opticon_init);
	module_exit(opticon_exit);		module_exit(opticon_exit);
			MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_LICENSE("GPL");		MODULE_LICENSE("GPL");

	module_param(debug, bool, S_IRUGO \| S_IWUSR);		module_param(debug, bool, S_IRUGO \| S_IWUSR);