USB: opticon: add rts and cts support
Add support for RTS and CTS line status Signed-off-by: Martin Jansen <martin.jansen@opticon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>hifive-unleashed-5.1
Martin Jansen
Greg Kroah-Hartman
parent
c9642374d0
commit
309a057932
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@ -1,6 +1,7 @@
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/*
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* Opticon USB barcode to serial driver
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*
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* Copyright (C) 2011 Martin Jansen <martin.jansen@opticon.com>
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* Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@suse.de>
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* Copyright (C) 2008 - 2009 Novell Inc.
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*
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@ -21,6 +22,16 @@
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#include <linux/usb/serial.h>
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#include <linux/uaccess.h>
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#define CONTROL_RTS 0x02
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#define RESEND_CTS_STATE 0x03
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/* max number of write urbs in flight */
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#define URB_UPPER_LIMIT 8
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/* This driver works for the Opticon 1D barcode reader
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* an examples of 1D barcode types are EAN, UPC, Code39, IATA etc.. */
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#define DRIVER_DESC "Opticon USB barcode to serial driver (1D)"
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static int debug;
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static const struct usb_device_id id_table[] = {
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@ -42,13 +53,13 @@ struct opticon_private {
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bool throttled;
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bool actually_throttled;
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bool rts;
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bool cts;
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int outstanding_urbs;
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};
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/* max number of write urbs in flight */
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#define URB_UPPER_LIMIT 4
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static void opticon_bulk_callback(struct urb *urb)
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static void opticon_read_bulk_callback(struct urb *urb)
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{
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struct opticon_private *priv = urb->context;
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unsigned char *data = urb->transfer_buffer;
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@ -57,6 +68,7 @@ static void opticon_bulk_callback(struct urb *urb)
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struct tty_struct *tty;
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int result;
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int data_length;
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unsigned long flags;
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dbg("%s - port %d", __func__, port->number);
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@ -87,10 +99,10 @@ static void opticon_bulk_callback(struct urb *urb)
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* Data from the device comes with a 2 byte header:
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*
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* <0x00><0x00>data...
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* This is real data to be sent to the tty layer
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* This is real data to be sent to the tty layer
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* <0x00><0x01)level
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* This is a RTS level change, the third byte is the RTS
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* value (0 for low, 1 for high).
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* This is a CTS level change, the third byte is the CTS
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* value (0 for low, 1 for high).
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*/
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if ((data[0] == 0x00) && (data[1] == 0x00)) {
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/* real data, send it to the tty layer */
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@ -103,10 +115,13 @@ static void opticon_bulk_callback(struct urb *urb)
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}
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} else {
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if ((data[0] == 0x00) && (data[1] == 0x01)) {
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spin_lock_irqsave(&priv->lock, flags);
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/* CTS status infomation package */
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if (data[2] == 0x00)
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priv->rts = false;
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priv->cts = false;
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else
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priv->rts = true;
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priv->cts = true;
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spin_unlock_irqrestore(&priv->lock, flags);
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} else {
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dev_dbg(&priv->udev->dev,
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"Unknown data packet received from the device:"
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@ -129,7 +144,7 @@ exit:
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usb_rcvbulkpipe(priv->udev,
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priv->bulk_address),
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priv->bulk_in_buffer, priv->buffer_size,
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opticon_bulk_callback, priv);
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opticon_read_bulk_callback, priv);
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result = usb_submit_urb(priv->bulk_read_urb, GFP_ATOMIC);
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if (result)
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dev_err(&port->dev,
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@ -140,6 +155,24 @@ exit:
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spin_unlock(&priv->lock);
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}
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static int send_control_msg(struct usb_serial_port *port, u8 requesttype,
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u8 val)
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{
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struct usb_serial *serial = port->serial;
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int retval;
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u8 buffer[2];
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buffer[0] = val;
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/* Send the message to the vendor control endpoint
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* of the connected device */
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retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
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requesttype,
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USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
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0, 0, buffer, 1, 0);
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return retval;
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}
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static int opticon_open(struct tty_struct *tty, struct usb_serial_port *port)
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{
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struct opticon_private *priv = usb_get_serial_data(port->serial);
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@ -152,19 +185,30 @@ static int opticon_open(struct tty_struct *tty, struct usb_serial_port *port)
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priv->throttled = false;
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priv->actually_throttled = false;
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priv->port = port;
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priv->rts = false;
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spin_unlock_irqrestore(&priv->lock, flags);
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/* Start reading from the device */
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/* Clear RTS line */
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send_control_msg(port, CONTROL_RTS, 0);
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/* Setup the read URB and start reading from the device */
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usb_fill_bulk_urb(priv->bulk_read_urb, priv->udev,
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usb_rcvbulkpipe(priv->udev,
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priv->bulk_address),
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priv->bulk_in_buffer, priv->buffer_size,
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opticon_bulk_callback, priv);
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opticon_read_bulk_callback, priv);
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/* clear the halt status of the enpoint */
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usb_clear_halt(priv->udev, priv->bulk_read_urb->pipe);
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result = usb_submit_urb(priv->bulk_read_urb, GFP_KERNEL);
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if (result)
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dev_err(&port->dev,
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"%s - failed resubmitting read urb, error %d\n",
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__func__, result);
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/* Request CTS line state, sometimes during opening the current
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* CTS state can be missed. */
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send_control_msg(port, RESEND_CTS_STATE, 1);
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return result;
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}
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@ -178,7 +222,7 @@ static void opticon_close(struct usb_serial_port *port)
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usb_kill_urb(priv->bulk_read_urb);
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}
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static void opticon_write_bulk_callback(struct urb *urb)
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static void opticon_write_control_callback(struct urb *urb)
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{
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struct opticon_private *priv = urb->context;
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int status = urb->status;
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@ -210,6 +254,7 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
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unsigned char *buffer;
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unsigned long flags;
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int status;
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struct usb_ctrlrequest *dr;
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dbg("%s - port %d", __func__, port->number);
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@ -226,6 +271,7 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
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if (!buffer) {
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dev_err(&port->dev, "out of memory\n");
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count = -ENOMEM;
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goto error_no_buffer;
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}
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@ -240,35 +286,28 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
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usb_serial_debug_data(debug, &port->dev, __func__, count, buffer);
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if (port->bulk_out_endpointAddress) {
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usb_fill_bulk_urb(urb, serial->dev,
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usb_sndbulkpipe(serial->dev,
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port->bulk_out_endpointAddress),
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buffer, count, opticon_write_bulk_callback, priv);
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} else {
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struct usb_ctrlrequest *dr;
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/* The conncected devices do not have a bulk write endpoint,
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* to transmit data to de barcode device the control endpoint is used */
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dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
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if (!dr)
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return -ENOMEM;
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dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
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if (!dr)
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return -ENOMEM;
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dr->bRequestType = USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT;
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dr->bRequest = 0x01;
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dr->wValue = 0;
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dr->wIndex = 0;
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dr->wLength = cpu_to_le16(count);
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dr->bRequestType = USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT;
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dr->bRequest = 0x01;
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dr->wValue = 0;
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dr->wIndex = 0;
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dr->wLength = cpu_to_le16(count);
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usb_fill_control_urb(urb, serial->dev,
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usb_sndctrlpipe(serial->dev, 0),
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(unsigned char *)dr, buffer, count,
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opticon_write_bulk_callback, priv);
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}
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usb_fill_control_urb(urb, serial->dev,
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usb_sndctrlpipe(serial->dev, 0),
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(unsigned char *)dr, buffer, count,
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opticon_write_control_callback, priv);
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/* send it down the pipe */
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status = usb_submit_urb(urb, GFP_ATOMIC);
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if (status) {
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dev_err(&port->dev,
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"%s - usb_submit_urb(write bulk) failed with status = %d\n",
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"%s - usb_submit_urb(write endpoint) failed status = %d\n",
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__func__, status);
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count = status;
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goto error;
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@ -360,16 +399,49 @@ static int opticon_tiocmget(struct tty_struct *tty, struct file *file)
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int result = 0;
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dbg("%s - port %d", __func__, port->number);
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if (!usb_get_intfdata(port->serial->interface))
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return -ENODEV;
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spin_lock_irqsave(&priv->lock, flags);
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if (priv->rts)
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result = TIOCM_RTS;
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result |= TIOCM_RTS;
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if (priv->cts)
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result |= TIOCM_CTS;
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spin_unlock_irqrestore(&priv->lock, flags);
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dbg("%s - %x", __func__, result);
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return result;
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}
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static int opticon_tiocmset(struct tty_struct *tty, struct file *file,
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unsigned int set, unsigned int clear)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct opticon_private *priv = usb_get_serial_data(port->serial);
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unsigned long flags;
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bool rts;
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bool changed = false;
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if (!usb_get_intfdata(port->serial->interface))
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return -ENODEV;
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/* We only support RTS so we only handle that */
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spin_lock_irqsave(&priv->lock, flags);
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rts = priv->rts;
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if (set & TIOCM_RTS)
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priv->rts = true;
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if (clear & TIOCM_RTS)
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priv->rts = false;
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changed = rts ^ priv->rts;
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spin_unlock_irqrestore(&priv->lock, flags);
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if (!changed)
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return 0;
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/* Send the new RTS state to the connected device */
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return send_control_msg(port, CONTROL_RTS, !rts);
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}
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static int get_serial_info(struct opticon_private *priv,
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struct serial_struct __user *serial)
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{
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@ -431,6 +503,7 @@ static int opticon_startup(struct usb_serial *serial)
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priv->serial = serial;
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priv->port = serial->port[0];
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priv->udev = serial->dev;
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priv->outstanding_urbs = 0; /* Init the outstanding urbs */
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/* find our bulk endpoint */
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intf = serial->interface->altsetting;
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@ -456,13 +529,6 @@ static int opticon_startup(struct usb_serial *serial)
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priv->bulk_address = endpoint->bEndpointAddress;
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/* set up our bulk urb */
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usb_fill_bulk_urb(priv->bulk_read_urb, priv->udev,
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usb_rcvbulkpipe(priv->udev,
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endpoint->bEndpointAddress),
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priv->bulk_in_buffer, priv->buffer_size,
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opticon_bulk_callback, priv);
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bulk_in_found = true;
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break;
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}
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@ -558,6 +624,7 @@ static struct usb_serial_driver opticon_device = {
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.unthrottle = opticon_unthrottle,
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.ioctl = opticon_ioctl,
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.tiocmget = opticon_tiocmget,
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.tiocmset = opticon_tiocmset,
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};
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static int __init opticon_init(void)
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@ -581,6 +648,7 @@ static void __exit opticon_exit(void)
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module_init(opticon_init);
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module_exit(opticon_exit);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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module_param(debug, bool, S_IRUGO | S_IWUSR);
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