From 79c822be7b85c8bfc682c011d06a02fe960773ad Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Fri, 15 Aug 2014 16:01:23 +0800
Subject: [PATCH] greybus: uart framework added, doesn't build

---
 drivers/staging/greybus/Makefile  |   1 +
 drivers/staging/greybus/uart-gb.c | 118 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 119 insertions(+)
 create mode 100644 drivers/staging/greybus/uart-gb.c

diff --git a/drivers/staging/greybus/Makefile b/drivers/staging/greybus/Makefile
index 12705b0..b84ff76 100644
--- a/drivers/staging/greybus/Makefile
+++ b/drivers/staging/greybus/Makefile
@@ -4,6 +4,7 @@ obj-m += greybus.o
 obj-m += i2c-gb.o
 obj-m += sdio-gb.o
 obj-m += gpio-gb.o
+obj-m += uart-gb.o
 
 KERNELVER		?= $(shell uname -r)
 KERNELDIR 		?= /lib/modules/$(KERNELVER)/build
diff --git a/drivers/staging/greybus/uart-gb.c b/drivers/staging/greybus/uart-gb.c
new file mode 100644
index 0000000..9527307
--- /dev/null
+++ b/drivers/staging/greybus/uart-gb.c
@@ -0,0 +1,118 @@
+/*
+ * I2C bridge driver for the Greybus "generic" I2C module.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/serial.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include "greybus.h"
+
+#define GB_TTY_MAJOR 180	/* FIXME use a real number!!! */
+
+struct gb_tty {
+	struct tty_port port;
+	struct greybus_device *gdev;
+	int cport;
+	unsigned int minor;
+	unsigned char clocal;
+	// FIXME locking!!!
+};
+
+static const struct greybus_device_id id_table[] = {
+	{ GREYBUS_DEVICE(0x45, 0x45) },	/* make shit up */
+	{ },	/* terminating NULL entry */
+};
+
+
+static const struct tty_operations gb_ops = {
+	.install =		gb_tty_install,
+	.open =			gb_tty_open,
+	.close =		gb_tty_close,
+	.cleanup =		gb_tty_cleanup,
+	.hangup =		gb_tty_hangup,
+	.write =		gb_tty_write,
+	.write_room =		gb_tty_write_room,
+	.ioctl =		gb_tty_ioctl,
+	.throttle =		gb_tty_throttle,
+	.unthrottle =		gb_tty_unthrottle,
+	.chars_in_buffer =	gb_tty_chars_in_buffer,
+	.break_ctl =		gb_tty_break_ctl,
+	.set_termios =		gb_tty_set_termios,
+	.tiocmget =		gb_tty_tiocmget,
+	.tiocmset =		gb_tty_tiocmset,
+};
+
+static struct tty_driver *gb_tty_driver;
+static struct gb_tty *gb_tty_table[255];
+
+static int tty_gb_probe(struct greybus_device *gdev, const struct greybus_device_id *id)
+{
+	int retval;
+
+	//greybus_set_drvdata(gdev, i2c_gb_data);
+	return 0;
+}
+
+static void tty_gb_disconnect(struct greybus_device *gdev)
+{
+}
+
+static struct greybus_driver tty_gb_driver = {
+	.probe =	tty_gb_probe,
+	.disconnect =	tty_gb_disconnect,
+	.id_table =	id_table,
+};
+
+
+static int __init gb_tty_init(void)
+{
+	int retval;
+
+	gb_tty_driver = alloc_tty_driver(255);
+	if (!gb_tty_driver)
+		return -ENOMEM;
+
+	gb_tty_driver->driver_name = "gb";
+	gb_tty_driver->name = "ttyGB";
+	gb_tty_driver->major = GB_TTY_MAJOR;
+	gb_tty_driver->minor_start = 0;
+	gb_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
+	gb_tty_driver->subtype = SERIAL_TYPE_NORMAL;
+	gb_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+	gb_tty_driver->init_termios = tty_std_termios;
+	gb_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+	tty_set_operations(gb_tty_driver, &gb_ops);
+
+	retval = tty_register_driver(gb_tty_driver);
+	if (retval) {
+		put_tty_driver(gb_tty_driver);
+		return retval;
+	}
+
+	retval = greybus_register(&tty_gb_driver);
+	if (retval) {
+		tty_unregister_driver(gb_tty_driver);
+		put_tty_driver(gb_tty_driver);
+	}
+	return retval;
+}
+
+static void __exit gb_tty_exit(void)
+{
+	greybus_deregister(&tty_gb_driver);
+	tty_unregister_driver(gb_tty_driver);
+	put_tty_driver(gb_tty_driver);
+}
+
+module_init(gb_tty_init);
+module_exit(gb_tty_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
-- 
2.7.4