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Diffstat (limited to 'drivers/usb/serial/kl5kusb105.c')
-rw-r--r--drivers/usb/serial/kl5kusb105.c515
1 files changed, 515 insertions, 0 deletions
diff --git a/drivers/usb/serial/kl5kusb105.c b/drivers/usb/serial/kl5kusb105.c
new file mode 100644
index 000000000..394b3189e
--- /dev/null
+++ b/drivers/usb/serial/kl5kusb105.c
@@ -0,0 +1,515 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * KLSI KL5KUSB105 chip RS232 converter driver
+ *
+ * Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
+ * Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
+ *
+ * All information about the device was acquired using SniffUSB ans snoopUSB
+ * on Windows98.
+ * It was written out of frustration with the PalmConnect USB Serial adapter
+ * sold by Palm Inc.
+ * Neither Palm, nor their contractor (MCCI) or their supplier (KLSI) provided
+ * information that was not already available.
+ *
+ * It seems that KLSI bought some silicon-design information from ScanLogic,
+ * whose SL11R processor is at the core of the KL5KUSB chipset from KLSI.
+ * KLSI has firmware available for their devices; it is probable that the
+ * firmware differs from that used by KLSI in their products. If you have an
+ * original KLSI device and can provide some information on it, I would be
+ * most interested in adding support for it here. If you have any information
+ * on the protocol used (or find errors in my reverse-engineered stuff), please
+ * let me know.
+ *
+ * The code was only tested with a PalmConnect USB adapter; if you
+ * are adventurous, try it with any KLSI-based device and let me know how it
+ * breaks so that I can fix it!
+ */
+
+/* TODO:
+ * check modem line signals
+ * implement handshaking or decide that we do not support it
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <asm/unaligned.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include "kl5kusb105.h"
+
+#define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
+#define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
+
+
+/*
+ * Function prototypes
+ */
+static int klsi_105_port_probe(struct usb_serial_port *port);
+static void klsi_105_port_remove(struct usb_serial_port *port);
+static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
+static void klsi_105_close(struct usb_serial_port *port);
+static void klsi_105_set_termios(struct tty_struct *tty,
+ struct usb_serial_port *port,
+ const struct ktermios *old_termios);
+static int klsi_105_tiocmget(struct tty_struct *tty);
+static void klsi_105_process_read_urb(struct urb *urb);
+static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
+ void *dest, size_t size);
+
+/*
+ * All of the device info needed for the KLSI converters.
+ */
+static const struct usb_device_id id_table[] = {
+ { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static struct usb_serial_driver kl5kusb105d_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "kl5kusb105d",
+ },
+ .description = "KL5KUSB105D / PalmConnect",
+ .id_table = id_table,
+ .num_ports = 1,
+ .bulk_out_size = 64,
+ .open = klsi_105_open,
+ .close = klsi_105_close,
+ .set_termios = klsi_105_set_termios,
+ .tiocmget = klsi_105_tiocmget,
+ .port_probe = klsi_105_port_probe,
+ .port_remove = klsi_105_port_remove,
+ .throttle = usb_serial_generic_throttle,
+ .unthrottle = usb_serial_generic_unthrottle,
+ .process_read_urb = klsi_105_process_read_urb,
+ .prepare_write_buffer = klsi_105_prepare_write_buffer,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+ &kl5kusb105d_device, NULL
+};
+
+struct klsi_105_port_settings {
+ u8 pktlen; /* always 5, it seems */
+ u8 baudrate;
+ u8 databits;
+ u8 unknown1;
+ u8 unknown2;
+};
+
+struct klsi_105_private {
+ struct klsi_105_port_settings cfg;
+ unsigned long line_state; /* modem line settings */
+ spinlock_t lock;
+};
+
+
+/*
+ * Handle vendor specific USB requests
+ */
+
+
+#define KLSI_TIMEOUT 5000 /* default urb timeout */
+
+static int klsi_105_chg_port_settings(struct usb_serial_port *port,
+ struct klsi_105_port_settings *settings)
+{
+ int rc;
+
+ rc = usb_control_msg_send(port->serial->dev,
+ 0,
+ KL5KUSB105A_SIO_SET_DATA,
+ USB_TYPE_VENDOR | USB_DIR_OUT |
+ USB_RECIP_INTERFACE,
+ 0, /* value */
+ 0, /* index */
+ settings,
+ sizeof(struct klsi_105_port_settings),
+ KLSI_TIMEOUT,
+ GFP_KERNEL);
+ if (rc)
+ dev_err(&port->dev,
+ "Change port settings failed (error = %d)\n", rc);
+
+ dev_dbg(&port->dev,
+ "pktlen %u, baudrate 0x%02x, databits %u, u1 %u, u2 %u\n",
+ settings->pktlen, settings->baudrate, settings->databits,
+ settings->unknown1, settings->unknown2);
+
+ return rc;
+}
+
+/*
+ * Read line control via vendor command and return result through
+ * the state pointer.
+ */
+static int klsi_105_get_line_state(struct usb_serial_port *port,
+ unsigned long *state)
+{
+ u16 status;
+ int rc;
+
+ rc = usb_control_msg_recv(port->serial->dev, 0,
+ KL5KUSB105A_SIO_POLL,
+ USB_TYPE_VENDOR | USB_DIR_IN,
+ 0, /* value */
+ 0, /* index */
+ &status, sizeof(status),
+ 10000,
+ GFP_KERNEL);
+ if (rc) {
+ dev_err(&port->dev, "reading line status failed: %d\n", rc);
+ return rc;
+ }
+
+ le16_to_cpus(&status);
+
+ dev_dbg(&port->dev, "read status %04x\n", status);
+
+ *state = ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0) |
+ ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0);
+
+ return 0;
+}
+
+
+/*
+ * Driver's tty interface functions
+ */
+
+static int klsi_105_port_probe(struct usb_serial_port *port)
+{
+ struct klsi_105_private *priv;
+
+ priv = kmalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ /* set initial values for control structures */
+ priv->cfg.pktlen = 5;
+ priv->cfg.baudrate = kl5kusb105a_sio_b9600;
+ priv->cfg.databits = kl5kusb105a_dtb_8;
+ priv->cfg.unknown1 = 0;
+ priv->cfg.unknown2 = 1;
+
+ priv->line_state = 0;
+
+ spin_lock_init(&priv->lock);
+
+ usb_set_serial_port_data(port, priv);
+
+ return 0;
+}
+
+static void klsi_105_port_remove(struct usb_serial_port *port)
+{
+ struct klsi_105_private *priv;
+
+ priv = usb_get_serial_port_data(port);
+ kfree(priv);
+}
+
+static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+ struct klsi_105_private *priv = usb_get_serial_port_data(port);
+ int retval = 0;
+ int rc;
+ unsigned long line_state;
+ struct klsi_105_port_settings cfg;
+ unsigned long flags;
+
+ /* Do a defined restart:
+ * Set up sane default baud rate and send the 'READ_ON'
+ * vendor command.
+ * FIXME: set modem line control (how?)
+ * Then read the modem line control and store values in
+ * priv->line_state.
+ */
+
+ cfg.pktlen = 5;
+ cfg.baudrate = kl5kusb105a_sio_b9600;
+ cfg.databits = kl5kusb105a_dtb_8;
+ cfg.unknown1 = 0;
+ cfg.unknown2 = 1;
+ klsi_105_chg_port_settings(port, &cfg);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->cfg.pktlen = cfg.pktlen;
+ priv->cfg.baudrate = cfg.baudrate;
+ priv->cfg.databits = cfg.databits;
+ priv->cfg.unknown1 = cfg.unknown1;
+ priv->cfg.unknown2 = cfg.unknown2;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ /* READ_ON and urb submission */
+ rc = usb_serial_generic_open(tty, port);
+ if (rc)
+ return rc;
+
+ rc = usb_control_msg(port->serial->dev,
+ usb_sndctrlpipe(port->serial->dev, 0),
+ KL5KUSB105A_SIO_CONFIGURE,
+ USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
+ KL5KUSB105A_SIO_CONFIGURE_READ_ON,
+ 0, /* index */
+ NULL,
+ 0,
+ KLSI_TIMEOUT);
+ if (rc < 0) {
+ dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
+ retval = rc;
+ goto err_generic_close;
+ } else
+ dev_dbg(&port->dev, "%s - enabled reading\n", __func__);
+
+ rc = klsi_105_get_line_state(port, &line_state);
+ if (rc < 0) {
+ retval = rc;
+ goto err_disable_read;
+ }
+
+ 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 0;
+
+err_disable_read:
+ usb_control_msg(port->serial->dev,
+ usb_sndctrlpipe(port->serial->dev, 0),
+ KL5KUSB105A_SIO_CONFIGURE,
+ USB_TYPE_VENDOR | USB_DIR_OUT,
+ KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
+ 0, /* index */
+ NULL, 0,
+ KLSI_TIMEOUT);
+err_generic_close:
+ usb_serial_generic_close(port);
+
+ return retval;
+}
+
+static void klsi_105_close(struct usb_serial_port *port)
+{
+ int rc;
+
+ /* send READ_OFF */
+ rc = usb_control_msg(port->serial->dev,
+ usb_sndctrlpipe(port->serial->dev, 0),
+ KL5KUSB105A_SIO_CONFIGURE,
+ USB_TYPE_VENDOR | USB_DIR_OUT,
+ KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
+ 0, /* index */
+ NULL, 0,
+ KLSI_TIMEOUT);
+ if (rc < 0)
+ dev_err(&port->dev, "failed to disable read: %d\n", rc);
+
+ /* shutdown our bulk reads and writes */
+ usb_serial_generic_close(port);
+}
+
+/* We need to write a complete 64-byte data block and encode the
+ * number actually sent in the first double-byte, LSB-order. That
+ * leaves at most 62 bytes of payload.
+ */
+#define KLSI_HDR_LEN 2
+static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
+ void *dest, size_t size)
+{
+ unsigned char *buf = dest;
+ int count;
+
+ count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
+ &port->lock);
+ put_unaligned_le16(count, buf);
+
+ return count + KLSI_HDR_LEN;
+}
+
+/* The data received is preceded by a length double-byte in LSB-first order.
+ */
+static void klsi_105_process_read_urb(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ unsigned char *data = urb->transfer_buffer;
+ unsigned len;
+
+ /* empty urbs seem to happen, we ignore them */
+ if (!urb->actual_length)
+ return;
+
+ if (urb->actual_length <= KLSI_HDR_LEN) {
+ dev_dbg(&port->dev, "%s - malformed packet\n", __func__);
+ return;
+ }
+
+ len = get_unaligned_le16(data);
+ if (len > urb->actual_length - KLSI_HDR_LEN) {
+ dev_dbg(&port->dev, "%s - packet length mismatch\n", __func__);
+ len = urb->actual_length - KLSI_HDR_LEN;
+ }
+
+ tty_insert_flip_string(&port->port, data + KLSI_HDR_LEN, len);
+ tty_flip_buffer_push(&port->port);
+}
+
+static void klsi_105_set_termios(struct tty_struct *tty,
+ struct usb_serial_port *port,
+ const struct ktermios *old_termios)
+{
+ struct klsi_105_private *priv = usb_get_serial_port_data(port);
+ struct device *dev = &port->dev;
+ unsigned int iflag = tty->termios.c_iflag;
+ unsigned int old_iflag = old_termios->c_iflag;
+ unsigned int cflag = tty->termios.c_cflag;
+ unsigned int old_cflag = old_termios->c_cflag;
+ struct klsi_105_port_settings *cfg;
+ unsigned long flags;
+ speed_t baud;
+
+ cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg)
+ return;
+
+ /* lock while we are modifying the settings */
+ spin_lock_irqsave(&priv->lock, flags);
+
+ /*
+ * Update baud rate
+ */
+ baud = tty_get_baud_rate(tty);
+
+ switch (baud) {
+ case 0: /* handled below */
+ break;
+ case 1200:
+ priv->cfg.baudrate = kl5kusb105a_sio_b1200;
+ break;
+ case 2400:
+ priv->cfg.baudrate = kl5kusb105a_sio_b2400;
+ break;
+ case 4800:
+ priv->cfg.baudrate = kl5kusb105a_sio_b4800;
+ break;
+ case 9600:
+ priv->cfg.baudrate = kl5kusb105a_sio_b9600;
+ break;
+ case 19200:
+ priv->cfg.baudrate = kl5kusb105a_sio_b19200;
+ break;
+ case 38400:
+ priv->cfg.baudrate = kl5kusb105a_sio_b38400;
+ break;
+ case 57600:
+ priv->cfg.baudrate = kl5kusb105a_sio_b57600;
+ break;
+ case 115200:
+ priv->cfg.baudrate = kl5kusb105a_sio_b115200;
+ break;
+ default:
+ dev_dbg(dev, "unsupported baudrate, using 9600\n");
+ priv->cfg.baudrate = kl5kusb105a_sio_b9600;
+ baud = 9600;
+ break;
+ }
+
+ /*
+ * FIXME: implement B0 handling
+ *
+ * Maybe this should be simulated by sending read disable and read
+ * enable messages?
+ */
+
+ tty_encode_baud_rate(tty, baud, baud);
+
+ if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
+ /* set the number of data bits */
+ switch (cflag & CSIZE) {
+ case CS5:
+ dev_dbg(dev, "%s - 5 bits/byte not supported\n", __func__);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ goto err;
+ case CS6:
+ dev_dbg(dev, "%s - 6 bits/byte not supported\n", __func__);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ goto err;
+ case CS7:
+ priv->cfg.databits = kl5kusb105a_dtb_7;
+ break;
+ case CS8:
+ priv->cfg.databits = kl5kusb105a_dtb_8;
+ break;
+ default:
+ dev_err(dev, "CSIZE was not CS5-CS8, using default of 8\n");
+ priv->cfg.databits = kl5kusb105a_dtb_8;
+ break;
+ }
+ }
+
+ /*
+ * Update line control register (LCR)
+ */
+ if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
+ || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
+ /* Not currently supported */
+ tty->termios.c_cflag &= ~(PARENB|PARODD|CSTOPB);
+ }
+ /*
+ * Set flow control: well, I do not really now how to handle DTR/RTS.
+ * 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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-18 15:53:30 +0000