/*
* Prolific PL2303 USB to serial adaptor driver
*
- * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
*
* Original driver for 2.2.x by anonymous
*
*
* See Documentation/usb/usb-serial.txt for more information on using this driver
*
+ * 2002_Mar_26 gkh
+ * allowed driver to work properly if there is no tty assigned to a port
+ * (this happens for serial console devices.)
+ *
* 2001_Oct_06 gkh
* Added RTS and DTR line control. Thanks to joe@bndlg.de for parts of it.
*
dbg (__FUNCTION__ " - port %d, %d bytes", port->number, count);
- if (!port->tty) {
- err (__FUNCTION__ " - no tty???");
- return 0;
- }
-
if (port->write_urb->status == -EINPROGRESS) {
dbg (__FUNCTION__ " - already writing");
return 0;
SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 4);
/* Setup termios */
- *(port->tty->termios) = tty_std_termios;
- port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+ if (port->tty) {
+ *(port->tty->termios) = tty_std_termios;
+ port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
- pl2303_set_termios (port, &tmp_termios);
+ pl2303_set_termios (port, &tmp_termios);
+ }
//FIXME: need to assert RTS and DTR if CRTSCTS off
dbg (__FUNCTION__ " - port %d", port->number);
if (serial->dev) {
- c_cflag = port->tty->termios->c_cflag;
- if (c_cflag & HUPCL) {
- /* drop DTR and RTS */
- priv = port->private;
- priv->line_control = 0;
- set_control_lines (port->serial->dev,
- priv->line_control);
+ if (port->tty) {
+ c_cflag = port->tty->termios->c_cflag;
+ if (c_cflag & HUPCL) {
+ /* drop DTR and RTS */
+ priv = port->private;
+ priv->line_control = 0;
+ set_control_lines (port->serial->dev,
+ priv->line_control);
+ }
}
/* shutdown our urbs */
usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, data);
tty = port->tty;
- if (urb->actual_length) {
+ if (tty && urb->actual_length) {
for (i = 0; i < urb->actual_length; ++i) {
if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
tty_flip_buffer_push(tty);
*
* See Documentation/usb/usb-serial.txt for more information on using this driver
*
+ * (03/27/2002) gkh
+ * Got USB serial console code working properly and merged into the main
+ * version of the tree. Thanks to Randy Dunlap for the initial version
+ * of this code, and for pushing me to finish it up.
+ * The USB serial console works with any usb serial driver device.
+ *
* (03/21/2002) gkh
* Moved all manipulation of port->open_count into the core. Now the
* individual driver's open and close functions are called only when the
#include <linux/smp_lock.h>
#include <linux/usb.h>
+#ifdef MODULE
+#undef CONFIG_USB_SERIAL_CONSOLE
+#endif
+#ifdef CONFIG_USB_SERIAL_CONSOLE
+#include <linux/console.h>
+#include <linux/serial.h>
+#endif
+
#ifdef CONFIG_USB_SERIAL_DEBUG
static int debug = 1;
#else
static struct usb_serial *serial_table[SERIAL_TTY_MINORS]; /* initially all NULL */
static LIST_HEAD(usb_serial_driver_list);
+#ifdef CONFIG_USB_SERIAL_CONSOLE
+struct usbcons_info {
+ int magic;
+ int break_flag;
+ struct usb_serial_port *port;
+};
+
+static struct usbcons_info usbcons_info;
+static struct console usbcons;
+#endif /* CONFIG_USB_SERIAL_CONSOLE */
static struct usb_serial *get_serial_by_minor (unsigned int minor)
{
/* force low_latency on so that our tty_push actually forces the data through,
otherwise it is scheduled, and with high data rates (like with OHCI) data
can get lost. */
- port->tty->low_latency = 1;
+ if (port->tty)
+ port->tty->low_latency = 1;
/* if we have a bulk interrupt, start reading from it */
if (serial->num_bulk_in) {
usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, data);
tty = port->tty;
- if (urb->actual_length) {
+ if (tty && urb->actual_length) {
for (i = 0; i < urb->actual_length ; ++i) {
/* if we insert more than TTY_FLIPBUF_SIZE characters, we drop them. */
if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
type->name, serial->port[i].number, serial->port[i].number);
}
+#ifdef CONFIG_USB_SERIAL_CONSOLE
+ if (minor == 0) {
+ /*
+ * Call register_console() if this is the first device plugged
+ * in. If we call it earlier, then the callback to
+ * console_setup() will fail, as there is not a device seen by
+ * the USB subsystem yet.
+ */
+ /*
+ * Register console.
+ * NOTES:
+ * console_setup() is called (back) immediately (from register_console).
+ * console_write() is called immediately from register_console iff
+ * CON_PRINTBUFFER is set in flags.
+ */
+ dbg ("registering the USB serial console.");
+ register_console(&usbcons);
+ }
+#endif
+
return serial; /* success */
static void __exit usb_serial_exit(void)
{
+#ifdef CONFIG_USB_SERIAL_CONSOLE
+ unregister_console(&usbcons);
+#endif
#ifdef CONFIG_USB_SERIAL_GENERIC
/* remove our generic driver */
-/* If the usb-serial core is build into the core, the usb-serial drivers
+/* If the usb-serial core is built into the core, the usb-serial drivers
need these symbols to load properly as modules. */
EXPORT_SYMBOL(usb_serial_register);
EXPORT_SYMBOL(usb_serial_deregister);
#endif
+#ifdef CONFIG_USB_SERIAL_CONSOLE
+/*
+ * ------------------------------------------------------------
+ * USB Serial console driver
+ *
+ * Much of the code here is copied from drivers/char/serial.c
+ * and implements a phony serial console in the same way that
+ * serial.c does so that in case some software queries it,
+ * it will get the same results.
+ *
+ * Things that are different from the way the serial port code
+ * does things, is that we call the lower level usb-serial
+ * driver code to initialize the device, and we set the initial
+ * console speeds based on the command line arguments.
+ * ------------------------------------------------------------
+ */
+
+#if 0
+static kdev_t usb_console_device(struct console *co)
+{
+ return MKDEV(SERIAL_TTY_MAJOR, co->index); /* TBD */
+}
+#endif
+
+/*
+ * The parsing of the command line works exactly like the
+ * serial.c code, except that the specifier is "ttyUSB" instead
+ * of "ttyS".
+ */
+static int __init usb_console_setup(struct console *co, char *options)
+{
+ struct usbcons_info *info = &usbcons_info;
+ int baud = 9600;
+ int bits = 8;
+ int parity = 'n';
+ int doflow = 0;
+ int cflag = CREAD | HUPCL | CLOCAL;
+ char *s;
+ struct usb_serial *serial;
+ struct usb_serial_port *port;
+ int retval = 0;
+ struct tty_struct *tty;
+ struct termios *termios;
+
+ dbg ("%s", __FUNCTION__);
+
+ if (options) {
+ baud = simple_strtoul(options, NULL, 10);
+ s = options;
+ while (*s >= '0' && *s <= '9')
+ s++;
+ if (*s) parity = *s++;
+ if (*s) bits = *s++ - '0';
+ if (*s) doflow = (*s++ == 'r');
+ }
+
+ /* build a cflag setting */
+ switch (baud) {
+ case 1200:
+ cflag |= B1200;
+ break;
+ case 2400:
+ cflag |= B2400;
+ break;
+ case 4800:
+ cflag |= B4800;
+ break;
+ case 19200:
+ cflag |= B19200;
+ break;
+ case 38400:
+ cflag |= B38400;
+ break;
+ case 57600:
+ cflag |= B57600;
+ break;
+ case 115200:
+ cflag |= B115200;
+ break;
+ case 9600:
+ default:
+ cflag |= B9600;
+ /*
+ * Set this to a sane value to prevent a divide error
+ */
+ baud = 9600;
+ break;
+ }
+ switch (bits) {
+ case 7:
+ cflag |= CS7;
+ break;
+ default:
+ case 8:
+ cflag |= CS8;
+ break;
+ }
+ switch (parity) {
+ case 'o': case 'O':
+ cflag |= PARODD;
+ break;
+ case 'e': case 'E':
+ cflag |= PARENB;
+ break;
+ }
+ co->cflag = cflag;
+
+ /* grab the first serial port that happens to be connected */
+ serial = get_serial_by_minor (0);
+ if (serial_paranoia_check (serial, __FUNCTION__)) {
+ /* no device is connected yet, sorry :( */
+ err ("No USB device connected to ttyUSB0");
+ return -ENODEV;
+ }
+
+ port = &serial->port[0];
+ down (&port->sem);
+ port->tty = NULL;
+
+ info->port = port;
+
+ ++port->open_count;
+ if (port->open_count == 1) {
+ /* only call the device specific open if this
+ * is the first time the port is opened */
+ if (serial->type->open)
+ retval = serial->type->open(port, NULL);
+ else
+ retval = generic_open(port, NULL);
+ if (retval)
+ port->open_count = 0;
+ }
+
+ up (&port->sem);
+
+ if (retval) {
+ err ("could not open USB console port");
+ return retval;
+ }
+
+ if (serial->type->set_termios) {
+ /* build up a fake tty structure so that the open call has something
+ * to look at to get the cflag value */
+ tty = kmalloc (sizeof (*tty), GFP_KERNEL);
+ if (!tty) {
+ err ("no more memory");
+ return -ENOMEM;
+ }
+ termios = kmalloc (sizeof (*termios), GFP_KERNEL);
+ if (!termios) {
+ err ("no more memory");
+ kfree (tty);
+ return -ENOMEM;
+ }
+ memset (tty, 0x00, sizeof(*tty));
+ memset (termios, 0x00, sizeof(*termios));
+ termios->c_cflag = cflag;
+ tty->termios = termios;
+ port->tty = tty;
+
+ /* set up the initial termios settings */
+ serial->type->set_termios(port, NULL);
+ port->tty = NULL;
+ kfree (termios);
+ kfree (tty);
+ }
+
+ return retval;
+}
+
+static void usb_console_write(struct console *co, const char *buf, unsigned count)
+{
+ static struct usbcons_info *info = &usbcons_info;
+ struct usb_serial_port *port = info->port;
+ struct usb_serial *serial = get_usb_serial (port, __FUNCTION__);
+ int retval = -ENODEV;
+
+ if (!serial || !port)
+ return;
+
+ if (count == 0)
+ return;
+
+ down (&port->sem);
+
+ dbg("%s - port %d, %d byte(s)", __FUNCTION__, port->number, count);
+
+ if (!port->open_count) {
+ dbg (__FUNCTION__ " - port not opened");
+ goto exit;
+ }
+
+ /* pass on to the driver specific version of this function if it is available */
+ if (serial->type->write)
+ retval = serial->type->write(port, 0, buf, count);
+ else
+ retval = generic_write(port, 0, buf, count);
+
+exit:
+ up (&port->sem);
+ dbg("%s - return value (if we had one): %d", __FUNCTION__, retval);
+}
+
+#if 0
+/*
+ * Receive character from the serial port
+ */
+static int usb_console_wait_key(struct console *co)
+{
+ static struct usbcons_info *info = &usbcons_info;
+ int c = 0;
+
+ dbg("%s", __FUNCTION__);
+
+ /* maybe use generic_read_bulk_callback ??? */
+
+ return c;
+}
+#endif
+
+static struct console usbcons = {
+ name: "ttyUSB", /* only [8] */
+ write: usb_console_write,
+#if 0
+ device: usb_console_device, /* TBD */
+ wait_key: usb_console_wait_key, /* TBD */
+#endif
+ setup: usb_console_setup,
+ flags: CON_PRINTBUFFER,
+ index: -1,
+};
+
+#endif /* CONFIG_USB_SERIAL_CONSOLE */
+
+
/* Module information */
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
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