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![Uwe Kleine-König](/assets/img/avatar_default.png)
All usb_serial drivers return 0 in their remove callbacks and driver core ignores the value returned by usb_serial_device_remove(). So change the remove callback to return void and return 0 unconditionally in usb_serial_device_remove(). Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org> Link: https://lore.kernel.org/r/20210208143149.963644-2-uwe@kleine-koenig.org Signed-off-by: Johan Hovold <johan@kernel.org>
730 lines
18 KiB
C
730 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* USB Keyspan PDA / Xircom / Entrega Converter driver
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*
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* Copyright (C) 1999 - 2001 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 1999, 2000 Brian Warner <warner@lothar.com>
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* Copyright (C) 2000 Al Borchers <borchers@steinerpoint.com>
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* Copyright (C) 2020 Johan Hovold <johan@kernel.org>
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*
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* See Documentation/usb/usb-serial.rst for more information on using this
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* driver
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include <linux/usb/ezusb.h>
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#define DRIVER_AUTHOR "Brian Warner <warner@lothar.com>, Johan Hovold <johan@kernel.org>"
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#define DRIVER_DESC "USB Keyspan PDA Converter driver"
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#define KEYSPAN_TX_THRESHOLD 128
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struct keyspan_pda_private {
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int tx_room;
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struct work_struct unthrottle_work;
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struct usb_serial *serial;
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struct usb_serial_port *port;
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};
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static int keyspan_pda_write_start(struct usb_serial_port *port);
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#define KEYSPAN_VENDOR_ID 0x06cd
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#define KEYSPAN_PDA_FAKE_ID 0x0103
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#define KEYSPAN_PDA_ID 0x0104 /* no clue */
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/* For Xircom PGSDB9 and older Entrega version of the same device */
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#define XIRCOM_VENDOR_ID 0x085a
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#define XIRCOM_FAKE_ID 0x8027
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#define XIRCOM_FAKE_ID_2 0x8025 /* "PGMFHUB" serial */
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#define ENTREGA_VENDOR_ID 0x1645
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#define ENTREGA_FAKE_ID 0x8093
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static const struct usb_device_id id_table_combined[] = {
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{ USB_DEVICE(KEYSPAN_VENDOR_ID, KEYSPAN_PDA_FAKE_ID) },
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{ USB_DEVICE(XIRCOM_VENDOR_ID, XIRCOM_FAKE_ID) },
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{ USB_DEVICE(XIRCOM_VENDOR_ID, XIRCOM_FAKE_ID_2) },
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{ USB_DEVICE(ENTREGA_VENDOR_ID, ENTREGA_FAKE_ID) },
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{ USB_DEVICE(KEYSPAN_VENDOR_ID, KEYSPAN_PDA_ID) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, id_table_combined);
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static const struct usb_device_id id_table_std[] = {
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{ USB_DEVICE(KEYSPAN_VENDOR_ID, KEYSPAN_PDA_ID) },
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{ } /* Terminating entry */
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};
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static const struct usb_device_id id_table_fake[] = {
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{ USB_DEVICE(KEYSPAN_VENDOR_ID, KEYSPAN_PDA_FAKE_ID) },
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{ USB_DEVICE(XIRCOM_VENDOR_ID, XIRCOM_FAKE_ID) },
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{ USB_DEVICE(XIRCOM_VENDOR_ID, XIRCOM_FAKE_ID_2) },
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{ USB_DEVICE(ENTREGA_VENDOR_ID, ENTREGA_FAKE_ID) },
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{ } /* Terminating entry */
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};
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static int keyspan_pda_get_write_room(struct keyspan_pda_private *priv)
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{
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struct usb_serial_port *port = priv->port;
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struct usb_serial *serial = port->serial;
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u8 *room;
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int rc;
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room = kmalloc(1, GFP_KERNEL);
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if (!room)
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return -ENOMEM;
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rc = usb_control_msg(serial->dev,
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usb_rcvctrlpipe(serial->dev, 0),
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6, /* write_room */
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USB_TYPE_VENDOR | USB_RECIP_INTERFACE
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| USB_DIR_IN,
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0, /* value: 0 means "remaining room" */
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0, /* index */
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room,
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1,
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2000);
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if (rc != 1) {
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if (rc >= 0)
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rc = -EIO;
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dev_dbg(&port->dev, "roomquery failed: %d\n", rc);
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goto out_free;
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}
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dev_dbg(&port->dev, "roomquery says %d\n", *room);
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rc = *room;
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out_free:
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kfree(room);
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return rc;
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}
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static void keyspan_pda_request_unthrottle(struct work_struct *work)
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{
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struct keyspan_pda_private *priv =
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container_of(work, struct keyspan_pda_private, unthrottle_work);
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struct usb_serial_port *port = priv->port;
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struct usb_serial *serial = port->serial;
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unsigned long flags;
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int result;
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dev_dbg(&port->dev, "%s\n", __func__);
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/*
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* Ask the device to tell us when the tx buffer becomes
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* sufficiently empty.
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*/
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result = usb_control_msg(serial->dev,
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usb_sndctrlpipe(serial->dev, 0),
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7, /* request_unthrottle */
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USB_TYPE_VENDOR | USB_RECIP_INTERFACE
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| USB_DIR_OUT,
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KEYSPAN_TX_THRESHOLD,
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0, /* index */
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NULL,
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0,
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2000);
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if (result < 0)
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dev_dbg(&serial->dev->dev, "%s - error %d from usb_control_msg\n",
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__func__, result);
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/*
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* Need to check available space after requesting notification in case
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* buffer is already empty so that no notification is sent.
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*/
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result = keyspan_pda_get_write_room(priv);
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if (result > KEYSPAN_TX_THRESHOLD) {
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spin_lock_irqsave(&port->lock, flags);
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priv->tx_room = max(priv->tx_room, result);
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spin_unlock_irqrestore(&port->lock, flags);
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usb_serial_port_softint(port);
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}
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}
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static void keyspan_pda_rx_interrupt(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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unsigned char *data = urb->transfer_buffer;
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unsigned int len = urb->actual_length;
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int retval;
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int status = urb->status;
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struct keyspan_pda_private *priv;
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unsigned long flags;
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priv = usb_get_serial_port_data(port);
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switch (status) {
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case 0:
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/* success */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n", __func__, status);
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return;
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default:
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dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
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goto exit;
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}
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if (len < 1) {
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dev_warn(&port->dev, "short message received\n");
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goto exit;
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}
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/* see if the message is data or a status interrupt */
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switch (data[0]) {
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case 0:
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/* rest of message is rx data */
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if (len < 2)
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break;
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tty_insert_flip_string(&port->port, data + 1, len - 1);
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tty_flip_buffer_push(&port->port);
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break;
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case 1:
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/* status interrupt */
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if (len < 2) {
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dev_warn(&port->dev, "short interrupt message received\n");
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break;
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}
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dev_dbg(&port->dev, "rx int, d1=%d\n", data[1]);
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switch (data[1]) {
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case 1: /* modemline change */
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break;
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case 2: /* tx unthrottle interrupt */
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spin_lock_irqsave(&port->lock, flags);
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priv->tx_room = max(priv->tx_room, KEYSPAN_TX_THRESHOLD);
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spin_unlock_irqrestore(&port->lock, flags);
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keyspan_pda_write_start(port);
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usb_serial_port_softint(port);
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break;
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default:
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break;
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}
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break;
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default:
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break;
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}
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exit:
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval)
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dev_err(&port->dev,
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"%s - usb_submit_urb failed with result %d\n",
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__func__, retval);
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}
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static void keyspan_pda_rx_throttle(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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/*
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* Stop receiving characters. We just turn off the URB request, and
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* let chars pile up in the device. If we're doing hardware
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* flowcontrol, the device will signal the other end when its buffer
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* fills up. If we're doing XON/XOFF, this would be a good time to
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* send an XOFF, although it might make sense to foist that off upon
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* the device too.
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*/
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usb_kill_urb(port->interrupt_in_urb);
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}
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static void keyspan_pda_rx_unthrottle(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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/* just restart the receive interrupt URB */
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if (usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL))
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dev_dbg(&port->dev, "usb_submit_urb(read urb) failed\n");
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}
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static speed_t keyspan_pda_setbaud(struct usb_serial *serial, speed_t baud)
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{
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int rc;
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int bindex;
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switch (baud) {
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case 110:
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bindex = 0;
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break;
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case 300:
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bindex = 1;
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break;
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case 1200:
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bindex = 2;
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break;
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case 2400:
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bindex = 3;
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break;
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case 4800:
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bindex = 4;
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break;
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case 9600:
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bindex = 5;
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break;
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case 19200:
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bindex = 6;
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break;
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case 38400:
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bindex = 7;
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break;
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case 57600:
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bindex = 8;
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break;
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case 115200:
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bindex = 9;
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break;
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default:
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bindex = 5; /* Default to 9600 */
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baud = 9600;
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}
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rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
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0, /* set baud */
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USB_TYPE_VENDOR
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| USB_RECIP_INTERFACE
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| USB_DIR_OUT, /* type */
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bindex, /* value */
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0, /* index */
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NULL, /* &data */
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0, /* size */
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2000); /* timeout */
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if (rc < 0)
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return 0;
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return baud;
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}
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static void keyspan_pda_break_ctl(struct tty_struct *tty, int break_state)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct usb_serial *serial = port->serial;
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int value;
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int result;
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if (break_state == -1)
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value = 1; /* start break */
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else
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value = 0; /* clear break */
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result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
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4, /* set break */
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USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
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value, 0, NULL, 0, 2000);
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if (result < 0)
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dev_dbg(&port->dev, "%s - error %d from usb_control_msg\n",
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__func__, result);
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}
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static void keyspan_pda_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old_termios)
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{
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struct usb_serial *serial = port->serial;
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speed_t speed;
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/*
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* cflag specifies lots of stuff: number of stop bits, parity, number
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* of data bits, baud. What can the device actually handle?:
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* CSTOPB (1 stop bit or 2)
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* PARENB (parity)
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* CSIZE (5bit .. 8bit)
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* There is minimal hw support for parity (a PSW bit seems to hold the
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* parity of whatever is in the accumulator). The UART either deals
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* with 10 bits (start, 8 data, stop) or 11 bits (start, 8 data,
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* 1 special, stop). So, with firmware changes, we could do:
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* 8N1: 10 bit
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* 8N2: 11 bit, extra bit always (mark?)
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* 8[EOMS]1: 11 bit, extra bit is parity
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* 7[EOMS]1: 10 bit, b0/b7 is parity
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* 7[EOMS]2: 11 bit, b0/b7 is parity, extra bit always (mark?)
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*
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* HW flow control is dictated by the tty->termios.c_cflags & CRTSCTS
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* bit.
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*
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* For now, just do baud.
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*/
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speed = tty_get_baud_rate(tty);
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speed = keyspan_pda_setbaud(serial, speed);
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if (speed == 0) {
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dev_dbg(&port->dev, "can't handle requested baud rate\n");
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/* It hasn't changed so.. */
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speed = tty_termios_baud_rate(old_termios);
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}
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/*
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* Only speed can change so copy the old h/w parameters then encode
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* the new speed.
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*/
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tty_termios_copy_hw(&tty->termios, old_termios);
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tty_encode_baud_rate(tty, speed, speed);
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}
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/*
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* Modem control pins: DTR and RTS are outputs and can be controlled.
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* DCD, RI, DSR, CTS are inputs and can be read. All outputs can also be
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* read. The byte passed is: DTR(b7) DCD RI DSR CTS RTS(b2) unused unused.
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*/
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static int keyspan_pda_get_modem_info(struct usb_serial *serial,
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unsigned char *value)
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{
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int rc;
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u8 *data;
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data = kmalloc(1, GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
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3, /* get pins */
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USB_TYPE_VENDOR|USB_RECIP_INTERFACE|USB_DIR_IN,
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0, 0, data, 1, 2000);
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if (rc == 1)
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*value = *data;
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else if (rc >= 0)
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rc = -EIO;
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kfree(data);
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return rc;
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}
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static int keyspan_pda_set_modem_info(struct usb_serial *serial,
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unsigned char value)
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{
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int rc;
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rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
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3, /* set pins */
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USB_TYPE_VENDOR|USB_RECIP_INTERFACE|USB_DIR_OUT,
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value, 0, NULL, 0, 2000);
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return rc;
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}
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static int keyspan_pda_tiocmget(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct usb_serial *serial = port->serial;
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int rc;
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unsigned char status;
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int value;
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rc = keyspan_pda_get_modem_info(serial, &status);
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if (rc < 0)
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return rc;
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value = ((status & BIT(7)) ? TIOCM_DTR : 0) |
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((status & BIT(6)) ? TIOCM_CAR : 0) |
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((status & BIT(5)) ? TIOCM_RNG : 0) |
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((status & BIT(4)) ? TIOCM_DSR : 0) |
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((status & BIT(3)) ? TIOCM_CTS : 0) |
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((status & BIT(2)) ? TIOCM_RTS : 0);
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return value;
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}
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static int keyspan_pda_tiocmset(struct tty_struct *tty,
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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 usb_serial *serial = port->serial;
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int rc;
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unsigned char status;
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rc = keyspan_pda_get_modem_info(serial, &status);
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if (rc < 0)
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return rc;
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if (set & TIOCM_RTS)
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status |= BIT(2);
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if (set & TIOCM_DTR)
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status |= BIT(7);
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if (clear & TIOCM_RTS)
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status &= ~BIT(2);
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if (clear & TIOCM_DTR)
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status &= ~BIT(7);
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rc = keyspan_pda_set_modem_info(serial, status);
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return rc;
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}
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static int keyspan_pda_write_start(struct usb_serial_port *port)
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{
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struct keyspan_pda_private *priv = usb_get_serial_port_data(port);
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unsigned long flags;
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struct urb *urb;
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int count;
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int room;
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int rc;
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/*
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* Guess how much room is left in the device's ring buffer. If our
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* write will result in no room left, ask the device to give us an
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* interrupt when the room available rises above a threshold but also
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* query how much room is currently available (in case our guess was
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* too conservative and the buffer is already empty when the
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* unthrottle work is scheduled).
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*/
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/*
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* We might block because of:
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* the TX urb is in-flight (wait until it completes)
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* the device is full (wait until it says there is room)
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*/
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spin_lock_irqsave(&port->lock, flags);
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room = priv->tx_room;
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count = kfifo_len(&port->write_fifo);
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if (!test_bit(0, &port->write_urbs_free) || count == 0 || room == 0) {
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spin_unlock_irqrestore(&port->lock, flags);
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return 0;
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}
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__clear_bit(0, &port->write_urbs_free);
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|
|
if (count > room)
|
|
count = room;
|
|
if (count > port->bulk_out_size)
|
|
count = port->bulk_out_size;
|
|
|
|
urb = port->write_urb;
|
|
count = kfifo_out(&port->write_fifo, urb->transfer_buffer, count);
|
|
urb->transfer_buffer_length = count;
|
|
|
|
port->tx_bytes += count;
|
|
priv->tx_room -= count;
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
dev_dbg(&port->dev, "%s - count = %d, txroom = %d\n", __func__, count, room);
|
|
|
|
rc = usb_submit_urb(urb, GFP_ATOMIC);
|
|
if (rc) {
|
|
dev_dbg(&port->dev, "usb_submit_urb(write bulk) failed\n");
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
port->tx_bytes -= count;
|
|
priv->tx_room = max(priv->tx_room, room + count);
|
|
__set_bit(0, &port->write_urbs_free);
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
return rc;
|
|
}
|
|
|
|
if (count == room)
|
|
schedule_work(&priv->unthrottle_work);
|
|
|
|
return count;
|
|
}
|
|
|
|
static void keyspan_pda_write_bulk_callback(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
port->tx_bytes -= urb->transfer_buffer_length;
|
|
__set_bit(0, &port->write_urbs_free);
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
keyspan_pda_write_start(port);
|
|
|
|
usb_serial_port_softint(port);
|
|
}
|
|
|
|
static int keyspan_pda_write(struct tty_struct *tty, struct usb_serial_port *port,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
int rc;
|
|
|
|
dev_dbg(&port->dev, "%s - count = %d\n", __func__, count);
|
|
|
|
if (!count)
|
|
return 0;
|
|
|
|
count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
|
|
|
|
rc = keyspan_pda_write_start(port);
|
|
if (rc)
|
|
return rc;
|
|
|
|
return count;
|
|
}
|
|
|
|
static void keyspan_pda_dtr_rts(struct usb_serial_port *port, int on)
|
|
{
|
|
struct usb_serial *serial = port->serial;
|
|
|
|
if (on)
|
|
keyspan_pda_set_modem_info(serial, BIT(7) | BIT(2));
|
|
else
|
|
keyspan_pda_set_modem_info(serial, 0);
|
|
}
|
|
|
|
|
|
static int keyspan_pda_open(struct tty_struct *tty,
|
|
struct usb_serial_port *port)
|
|
{
|
|
struct keyspan_pda_private *priv = usb_get_serial_port_data(port);
|
|
int rc;
|
|
|
|
/* find out how much room is in the Tx ring */
|
|
rc = keyspan_pda_get_write_room(priv);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
spin_lock_irq(&port->lock);
|
|
priv->tx_room = rc;
|
|
spin_unlock_irq(&port->lock);
|
|
|
|
rc = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
|
|
if (rc) {
|
|
dev_dbg(&port->dev, "%s - usb_submit_urb(read int) failed\n", __func__);
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void keyspan_pda_close(struct usb_serial_port *port)
|
|
{
|
|
struct keyspan_pda_private *priv = usb_get_serial_port_data(port);
|
|
|
|
/*
|
|
* Stop the interrupt URB first as its completion handler may submit
|
|
* the write URB.
|
|
*/
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
usb_kill_urb(port->write_urb);
|
|
|
|
cancel_work_sync(&priv->unthrottle_work);
|
|
|
|
spin_lock_irq(&port->lock);
|
|
kfifo_reset(&port->write_fifo);
|
|
spin_unlock_irq(&port->lock);
|
|
}
|
|
|
|
/* download the firmware to a "fake" device (pre-renumeration) */
|
|
static int keyspan_pda_fake_startup(struct usb_serial *serial)
|
|
{
|
|
unsigned int vid = le16_to_cpu(serial->dev->descriptor.idVendor);
|
|
const char *fw_name;
|
|
|
|
/* download the firmware here ... */
|
|
ezusb_fx1_set_reset(serial->dev, 1);
|
|
|
|
switch (vid) {
|
|
case KEYSPAN_VENDOR_ID:
|
|
fw_name = "keyspan_pda/keyspan_pda.fw";
|
|
break;
|
|
case XIRCOM_VENDOR_ID:
|
|
case ENTREGA_VENDOR_ID:
|
|
fw_name = "keyspan_pda/xircom_pgs.fw";
|
|
break;
|
|
default:
|
|
dev_err(&serial->dev->dev, "%s: unknown vendor, aborting.\n",
|
|
__func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (ezusb_fx1_ihex_firmware_download(serial->dev, fw_name) < 0) {
|
|
dev_err(&serial->dev->dev, "failed to load firmware \"%s\"\n",
|
|
fw_name);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/*
|
|
* After downloading firmware renumeration will occur in a moment and
|
|
* the new device will bind to the real driver.
|
|
*/
|
|
|
|
/* We want this device to fail to have a driver assigned to it. */
|
|
return 1;
|
|
}
|
|
|
|
MODULE_FIRMWARE("keyspan_pda/keyspan_pda.fw");
|
|
MODULE_FIRMWARE("keyspan_pda/xircom_pgs.fw");
|
|
|
|
static int keyspan_pda_port_probe(struct usb_serial_port *port)
|
|
{
|
|
|
|
struct keyspan_pda_private *priv;
|
|
|
|
priv = kmalloc(sizeof(struct keyspan_pda_private), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
INIT_WORK(&priv->unthrottle_work, keyspan_pda_request_unthrottle);
|
|
priv->port = port;
|
|
|
|
usb_set_serial_port_data(port, priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void keyspan_pda_port_remove(struct usb_serial_port *port)
|
|
{
|
|
struct keyspan_pda_private *priv;
|
|
|
|
priv = usb_get_serial_port_data(port);
|
|
kfree(priv);
|
|
}
|
|
|
|
static struct usb_serial_driver keyspan_pda_fake_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "keyspan_pda_pre",
|
|
},
|
|
.description = "Keyspan PDA - (prerenumeration)",
|
|
.id_table = id_table_fake,
|
|
.num_ports = 1,
|
|
.attach = keyspan_pda_fake_startup,
|
|
};
|
|
|
|
static struct usb_serial_driver keyspan_pda_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "keyspan_pda",
|
|
},
|
|
.description = "Keyspan PDA",
|
|
.id_table = id_table_std,
|
|
.num_ports = 1,
|
|
.num_bulk_out = 1,
|
|
.num_interrupt_in = 1,
|
|
.dtr_rts = keyspan_pda_dtr_rts,
|
|
.open = keyspan_pda_open,
|
|
.close = keyspan_pda_close,
|
|
.write = keyspan_pda_write,
|
|
.write_bulk_callback = keyspan_pda_write_bulk_callback,
|
|
.read_int_callback = keyspan_pda_rx_interrupt,
|
|
.throttle = keyspan_pda_rx_throttle,
|
|
.unthrottle = keyspan_pda_rx_unthrottle,
|
|
.set_termios = keyspan_pda_set_termios,
|
|
.break_ctl = keyspan_pda_break_ctl,
|
|
.tiocmget = keyspan_pda_tiocmget,
|
|
.tiocmset = keyspan_pda_tiocmset,
|
|
.port_probe = keyspan_pda_port_probe,
|
|
.port_remove = keyspan_pda_port_remove,
|
|
};
|
|
|
|
static struct usb_serial_driver * const serial_drivers[] = {
|
|
&keyspan_pda_device,
|
|
&keyspan_pda_fake_device,
|
|
NULL
|
|
};
|
|
|
|
module_usb_serial_driver(serial_drivers, id_table_combined);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|