USB: split the usb serial console code out into its own file.

drivers/usb/serial/Makefile

@@ -4,7 +4,10 @@
 
 # Object file lists.
 
-obj-$(CONFIG_USB_SERIAL)                        += usbserial.o
+obj-$(CONFIG_USB_SERIAL)			+= usbserial.o
+
+usbserial-obj-$(CONFIG_USB_SERIAL_CONSOLE)	+= console.o
+
 obj-$(CONFIG_USB_SERIAL_VISOR)			+= visor.o
 obj-$(CONFIG_USB_SERIAL_IPAQ)			+= ipaq.o
 obj-$(CONFIG_USB_SERIAL_WHITEHEAT)		+= whiteheat.o
@@ -26,7 +29,9 @@ obj-$(CONFIG_USB_SERIAL_KLSI)			+= kl5kusb105.o
 obj-$(CONFIG_USB_SERIAL_SAFE)			+= safe_serial.o
 
 # Objects that export symbols.
-export-objs	:= usbserial.o
+export-objs	:= usb-serial.o
+
+usbserial-objs	:= usb-serial.o $(usbserial-obj-y)
 
 include $(TOPDIR)/Rules.make
 

drivers/usb/serial/console.c

+/*
+ * USB Serial Console driver
+ *
+ * Copyright (C) 2001 - 2002 Greg Kroah-Hartman (greg@kroah.com)
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License version
+ *	2 as published by the Free Software Foundation.
+ * 
+ * Thanks to Randy Dunlap for the original version of this code.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/console.h>
+#include <linux/usb.h>
+
+static int debug;
+
+#include "usb-serial.h"
+
+struct usbcons_info {
+	int			magic;
+	int			break_flag;
+	struct usb_serial_port	*port;
+};
+
+static struct usbcons_info usbcons_info;
+static struct console usbcons;
+
+/*
+ * ------------------------------------------------------------
+ * 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.
+ * ------------------------------------------------------------
+ */
+
+
+/*
+ * 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 = usb_serial_get_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 = usb_serial_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 ("%s - port not opened", __FUNCTION__);
+		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 = usb_serial_generic_write(port, 0, buf, count);
+
+exit:
+	up (&port->sem);
+	dbg("%s - return value (if we had one): %d", __FUNCTION__, retval);
+}
+
+static struct console usbcons = {
+	.name =		"ttyUSB",
+	.write =	usb_console_write,
+	.setup =	usb_console_setup,
+	.flags =	CON_PRINTBUFFER,
+	.index =	-1,
+};
+
+void usb_serial_console_init (int serial_debug, int minor)
+{
+	debug = serial_debug;
+
+	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);
+	}
+}
+
+void usb_serial_console_exit (void)
+{
+	unregister_console(&usbcons);
+}
+

drivers/usb/serial/usb-serial.h

@@ -117,7 +117,7 @@ struct usb_serial_port {
 	__u8			bulk_out_endpointAddress;
 
 	wait_queue_head_t	write_wait;
-	struct work_struct			work;
+	struct work_struct	work;
 	int			open_count;
 	struct semaphore	sem;
 	void *			private;
@@ -256,6 +256,19 @@ extern int ezusb_writememory (struct usb_serial *serial, int address, unsigned c
 extern int ezusb_set_reset (struct usb_serial *serial, unsigned char reset_bit);
 #endif
 
+/* USB Serial console functions */
+#ifdef CONFIG_USB_SERIAL_CONSOLE
+extern void usb_serial_console_init (int debug, int minor);
+extern void usb_serial_console_exit (void);
+#else
+static inline void usb_serial_console_init (int debug, int minor) { }
+static inline void usb_serial_console_exit (void) { }
+#endif
+
+/* Functions needed by the usb serial console code */
+extern struct usb_serial *usb_serial_get_by_minor (unsigned int minor);
+extern int usb_serial_generic_open (struct usb_serial_port *port, struct file *filp);
+extern int usb_serial_generic_write (struct usb_serial_port *port, int from_user, const unsigned char *buf, int count);
 
 /* Inline functions to check the sanity of a pointer that is passed to us */
 static inline int serial_paranoia_check (struct usb_serial *serial, const char *function)