546 строки
14 KiB
C
546 строки
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* KLSI KL5KUSB105 chip RS232 converter driver
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*
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* Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
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* Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
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*
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* All information about the device was acquired using SniffUSB ans snoopUSB
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* on Windows98.
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* It was written out of frustration with the PalmConnect USB Serial adapter
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* sold by Palm Inc.
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* Neither Palm, nor their contractor (MCCI) or their supplier (KLSI) provided
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* information that was not already available.
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*
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* It seems that KLSI bought some silicon-design information from ScanLogic,
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* whose SL11R processor is at the core of the KL5KUSB chipset from KLSI.
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* KLSI has firmware available for their devices; it is probable that the
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* firmware differs from that used by KLSI in their products. If you have an
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* original KLSI device and can provide some information on it, I would be
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* most interested in adding support for it here. If you have any information
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* on the protocol used (or find errors in my reverse-engineered stuff), please
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* let me know.
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*
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* The code was only tested with a PalmConnect USB adapter; if you
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* are adventurous, try it with any KLSI-based device and let me know how it
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* breaks so that I can fix it!
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*/
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/* TODO:
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* check modem line signals
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* implement handshaking or decide that we do not support it
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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/uaccess.h>
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#include <asm/unaligned.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include "kl5kusb105.h"
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#define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
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#define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
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/*
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* Function prototypes
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*/
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static int klsi_105_port_probe(struct usb_serial_port *port);
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static int klsi_105_port_remove(struct usb_serial_port *port);
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static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
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static void klsi_105_close(struct usb_serial_port *port);
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static void klsi_105_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old);
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static int klsi_105_tiocmget(struct tty_struct *tty);
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static void klsi_105_process_read_urb(struct urb *urb);
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static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
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void *dest, size_t size);
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/*
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* All of the device info needed for the KLSI converters.
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*/
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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static struct usb_serial_driver kl5kusb105d_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "kl5kusb105d",
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},
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.description = "KL5KUSB105D / PalmConnect",
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.id_table = id_table,
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.num_ports = 1,
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.bulk_out_size = 64,
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.open = klsi_105_open,
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.close = klsi_105_close,
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.set_termios = klsi_105_set_termios,
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.tiocmget = klsi_105_tiocmget,
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.port_probe = klsi_105_port_probe,
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.port_remove = klsi_105_port_remove,
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.throttle = usb_serial_generic_throttle,
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.unthrottle = usb_serial_generic_unthrottle,
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.process_read_urb = klsi_105_process_read_urb,
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.prepare_write_buffer = klsi_105_prepare_write_buffer,
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};
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static struct usb_serial_driver * const serial_drivers[] = {
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&kl5kusb105d_device, NULL
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};
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struct klsi_105_port_settings {
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u8 pktlen; /* always 5, it seems */
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u8 baudrate;
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u8 databits;
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u8 unknown1;
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u8 unknown2;
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};
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struct klsi_105_private {
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struct klsi_105_port_settings cfg;
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unsigned long line_state; /* modem line settings */
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spinlock_t lock;
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};
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/*
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* Handle vendor specific USB requests
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*/
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#define KLSI_TIMEOUT 5000 /* default urb timeout */
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static int klsi_105_chg_port_settings(struct usb_serial_port *port,
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struct klsi_105_port_settings *settings)
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{
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int rc;
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rc = usb_control_msg(port->serial->dev,
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usb_sndctrlpipe(port->serial->dev, 0),
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KL5KUSB105A_SIO_SET_DATA,
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USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
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0, /* value */
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0, /* index */
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settings,
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sizeof(struct klsi_105_port_settings),
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KLSI_TIMEOUT);
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if (rc < 0)
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dev_err(&port->dev,
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"Change port settings failed (error = %d)\n", rc);
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dev_dbg(&port->dev,
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"pktlen %u, baudrate 0x%02x, databits %u, u1 %u, u2 %u\n",
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settings->pktlen, settings->baudrate, settings->databits,
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settings->unknown1, settings->unknown2);
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return rc;
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}
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/* translate a 16-bit status value from the device to linux's TIO bits */
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static unsigned long klsi_105_status2linestate(const __u16 status)
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{
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unsigned long res = 0;
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res = ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
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| ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
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;
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return res;
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}
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/*
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* Read line control via vendor command and return result through
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* *line_state_p
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*/
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/* It seems that the status buffer has always only 2 bytes length */
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#define KLSI_STATUSBUF_LEN 2
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static int klsi_105_get_line_state(struct usb_serial_port *port,
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unsigned long *line_state_p)
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{
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int rc;
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u8 *status_buf;
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__u16 status;
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status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
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if (!status_buf)
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return -ENOMEM;
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status_buf[0] = 0xff;
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status_buf[1] = 0xff;
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rc = usb_control_msg(port->serial->dev,
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usb_rcvctrlpipe(port->serial->dev, 0),
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KL5KUSB105A_SIO_POLL,
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USB_TYPE_VENDOR | USB_DIR_IN,
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0, /* value */
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0, /* index */
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status_buf, KLSI_STATUSBUF_LEN,
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10000
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);
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if (rc != KLSI_STATUSBUF_LEN) {
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dev_err(&port->dev, "reading line status failed: %d\n", rc);
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if (rc >= 0)
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rc = -EIO;
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} else {
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status = get_unaligned_le16(status_buf);
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dev_dbg(&port->dev, "read status %02x %02x\n",
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status_buf[0], status_buf[1]);
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*line_state_p = klsi_105_status2linestate(status);
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}
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kfree(status_buf);
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return rc;
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}
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/*
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* Driver's tty interface functions
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*/
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static int klsi_105_port_probe(struct usb_serial_port *port)
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{
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struct klsi_105_private *priv;
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priv = kmalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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/* set initial values for control structures */
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priv->cfg.pktlen = 5;
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priv->cfg.baudrate = kl5kusb105a_sio_b9600;
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priv->cfg.databits = kl5kusb105a_dtb_8;
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priv->cfg.unknown1 = 0;
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priv->cfg.unknown2 = 1;
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priv->line_state = 0;
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spin_lock_init(&priv->lock);
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usb_set_serial_port_data(port, priv);
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return 0;
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}
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static int klsi_105_port_remove(struct usb_serial_port *port)
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{
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struct klsi_105_private *priv;
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priv = usb_get_serial_port_data(port);
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kfree(priv);
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return 0;
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}
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static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
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{
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struct klsi_105_private *priv = usb_get_serial_port_data(port);
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int retval = 0;
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int rc;
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unsigned long line_state;
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struct klsi_105_port_settings *cfg;
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unsigned long flags;
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/* Do a defined restart:
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* Set up sane default baud rate and send the 'READ_ON'
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* vendor command.
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* FIXME: set modem line control (how?)
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* Then read the modem line control and store values in
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* priv->line_state.
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*/
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cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
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if (!cfg)
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return -ENOMEM;
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cfg->pktlen = 5;
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cfg->baudrate = kl5kusb105a_sio_b9600;
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cfg->databits = kl5kusb105a_dtb_8;
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cfg->unknown1 = 0;
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cfg->unknown2 = 1;
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klsi_105_chg_port_settings(port, cfg);
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spin_lock_irqsave(&priv->lock, flags);
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priv->cfg.pktlen = cfg->pktlen;
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priv->cfg.baudrate = cfg->baudrate;
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priv->cfg.databits = cfg->databits;
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priv->cfg.unknown1 = cfg->unknown1;
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priv->cfg.unknown2 = cfg->unknown2;
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spin_unlock_irqrestore(&priv->lock, flags);
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/* READ_ON and urb submission */
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rc = usb_serial_generic_open(tty, port);
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if (rc) {
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retval = rc;
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goto err_free_cfg;
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}
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rc = usb_control_msg(port->serial->dev,
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usb_sndctrlpipe(port->serial->dev, 0),
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KL5KUSB105A_SIO_CONFIGURE,
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USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
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KL5KUSB105A_SIO_CONFIGURE_READ_ON,
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0, /* index */
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NULL,
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0,
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KLSI_TIMEOUT);
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if (rc < 0) {
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dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
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retval = rc;
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goto err_generic_close;
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} else
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dev_dbg(&port->dev, "%s - enabled reading\n", __func__);
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rc = klsi_105_get_line_state(port, &line_state);
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if (rc < 0) {
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retval = rc;
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goto err_disable_read;
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}
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spin_lock_irqsave(&priv->lock, flags);
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priv->line_state = line_state;
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spin_unlock_irqrestore(&priv->lock, flags);
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dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__,
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line_state);
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return 0;
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err_disable_read:
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usb_control_msg(port->serial->dev,
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usb_sndctrlpipe(port->serial->dev, 0),
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KL5KUSB105A_SIO_CONFIGURE,
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USB_TYPE_VENDOR | USB_DIR_OUT,
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KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
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0, /* index */
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NULL, 0,
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KLSI_TIMEOUT);
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err_generic_close:
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usb_serial_generic_close(port);
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err_free_cfg:
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kfree(cfg);
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return retval;
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}
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static void klsi_105_close(struct usb_serial_port *port)
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{
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int rc;
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/* send READ_OFF */
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rc = usb_control_msg(port->serial->dev,
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usb_sndctrlpipe(port->serial->dev, 0),
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KL5KUSB105A_SIO_CONFIGURE,
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USB_TYPE_VENDOR | USB_DIR_OUT,
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KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
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0, /* index */
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NULL, 0,
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KLSI_TIMEOUT);
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if (rc < 0)
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dev_err(&port->dev, "failed to disable read: %d\n", rc);
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/* shutdown our bulk reads and writes */
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usb_serial_generic_close(port);
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}
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/* We need to write a complete 64-byte data block and encode the
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* number actually sent in the first double-byte, LSB-order. That
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* leaves at most 62 bytes of payload.
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*/
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#define KLSI_HDR_LEN 2
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static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
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void *dest, size_t size)
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{
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unsigned char *buf = dest;
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int count;
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count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
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&port->lock);
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put_unaligned_le16(count, buf);
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return count + KLSI_HDR_LEN;
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}
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/* The data received is preceded by a length double-byte in LSB-first order.
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*/
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static void klsi_105_process_read_urb(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 len;
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/* empty urbs seem to happen, we ignore them */
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if (!urb->actual_length)
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return;
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if (urb->actual_length <= KLSI_HDR_LEN) {
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dev_dbg(&port->dev, "%s - malformed packet\n", __func__);
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return;
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}
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len = get_unaligned_le16(data);
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if (len > urb->actual_length - KLSI_HDR_LEN) {
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dev_dbg(&port->dev, "%s - packet length mismatch\n", __func__);
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len = urb->actual_length - KLSI_HDR_LEN;
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}
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tty_insert_flip_string(&port->port, data + KLSI_HDR_LEN, len);
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tty_flip_buffer_push(&port->port);
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}
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static void klsi_105_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port,
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struct ktermios *old_termios)
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{
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struct klsi_105_private *priv = usb_get_serial_port_data(port);
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struct device *dev = &port->dev;
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unsigned int iflag = tty->termios.c_iflag;
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unsigned int old_iflag = old_termios->c_iflag;
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unsigned int cflag = tty->termios.c_cflag;
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unsigned int old_cflag = old_termios->c_cflag;
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struct klsi_105_port_settings *cfg;
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unsigned long flags;
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speed_t baud;
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cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
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if (!cfg)
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return;
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/* lock while we are modifying the settings */
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spin_lock_irqsave(&priv->lock, flags);
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/*
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* Update baud rate
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*/
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baud = tty_get_baud_rate(tty);
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switch (baud) {
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case 0: /* handled below */
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break;
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case 1200:
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priv->cfg.baudrate = kl5kusb105a_sio_b1200;
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break;
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case 2400:
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priv->cfg.baudrate = kl5kusb105a_sio_b2400;
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break;
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case 4800:
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priv->cfg.baudrate = kl5kusb105a_sio_b4800;
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break;
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case 9600:
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priv->cfg.baudrate = kl5kusb105a_sio_b9600;
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break;
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case 19200:
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priv->cfg.baudrate = kl5kusb105a_sio_b19200;
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break;
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case 38400:
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priv->cfg.baudrate = kl5kusb105a_sio_b38400;
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break;
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case 57600:
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priv->cfg.baudrate = kl5kusb105a_sio_b57600;
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break;
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case 115200:
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priv->cfg.baudrate = kl5kusb105a_sio_b115200;
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break;
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default:
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dev_dbg(dev, "unsupported baudrate, using 9600\n");
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priv->cfg.baudrate = kl5kusb105a_sio_b9600;
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baud = 9600;
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break;
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}
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/*
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* FIXME: implement B0 handling
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*
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* Maybe this should be simulated by sending read disable and read
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* enable messages?
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*/
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tty_encode_baud_rate(tty, baud, baud);
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if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
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/* set the number of data bits */
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switch (cflag & CSIZE) {
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case CS5:
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dev_dbg(dev, "%s - 5 bits/byte not supported\n", __func__);
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spin_unlock_irqrestore(&priv->lock, flags);
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goto err;
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case CS6:
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dev_dbg(dev, "%s - 6 bits/byte not supported\n", __func__);
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spin_unlock_irqrestore(&priv->lock, flags);
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goto err;
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case CS7:
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priv->cfg.databits = kl5kusb105a_dtb_7;
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break;
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case CS8:
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priv->cfg.databits = kl5kusb105a_dtb_8;
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break;
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default:
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dev_err(dev, "CSIZE was not CS5-CS8, using default of 8\n");
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priv->cfg.databits = kl5kusb105a_dtb_8;
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break;
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}
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}
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/*
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* Update line control register (LCR)
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*/
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if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
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|| (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
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/* Not currently supported */
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tty->termios.c_cflag &= ~(PARENB|PARODD|CSTOPB);
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}
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/*
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* Set flow control: well, I do not really now how to handle DTR/RTS.
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|
* Just do what we have seen with SniffUSB on Win98.
|
|
*/
|
|
if ((iflag & IXOFF) != (old_iflag & IXOFF)
|
|
|| (iflag & IXON) != (old_iflag & IXON)
|
|
|| (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
|
|
/* Not currently supported */
|
|
tty->termios.c_cflag &= ~CRTSCTS;
|
|
}
|
|
memcpy(cfg, &priv->cfg, sizeof(*cfg));
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
/* now commit changes to device */
|
|
klsi_105_chg_port_settings(port, cfg);
|
|
err:
|
|
kfree(cfg);
|
|
}
|
|
|
|
static int klsi_105_tiocmget(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct klsi_105_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long flags;
|
|
int rc;
|
|
unsigned long line_state;
|
|
|
|
rc = klsi_105_get_line_state(port, &line_state);
|
|
if (rc < 0) {
|
|
dev_err(&port->dev,
|
|
"Reading line control failed (error = %d)\n", rc);
|
|
/* better return value? EAGAIN? */
|
|
return rc;
|
|
}
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
priv->line_state = line_state;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
|
|
return (int)line_state;
|
|
}
|
|
|
|
module_usb_serial_driver(serial_drivers, id_table);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|