[PATCH] sh: maple: add support for the Maple mouse on the SEGA Dreamcast

[Adrian McMenamin <adrian@newgolddream.dyndns.info>]

Here is a cleaned up version of the maple mouse driver - Dmitry, I tried
using open and close functions as per the joystick but they seemed to
get in the way of proper mouse operation. As it is the joystick does
null out the callback pointer on removal of the driver, which seems to
me to be the correct behaviour.



Add support for the Maple mouse on the SEGA Dreamcast.

Signed-off-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
---

diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index 4e99342..71cc98a 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig
@@ -286,4 +286,15 @@ config MOUSE_GPIO
 	  To compile this driver as a module, choose M here: the
 	  module will be called gpio_mouse.
 
+config MOUSE_MAPLE
+	tristate "Maple mouse (for the Dreamcast)"
+	depends on MAPLE
+	help
+	  This driver supports the Maple mouse on the SEGA Dreamcast.
+
+	  Most Dreamcast users, who have a mouse, will say Y here.
+
+	  To compile this driver as a module choose M here: the module will be
+	  called maplemouse.
+
 endif
diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
index 96f1dd8..0272f5d 100644
--- a/drivers/input/mouse/Makefile
+++ b/drivers/input/mouse/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_MOUSE_SERIAL)	+= sermouse.o
 obj-$(CONFIG_MOUSE_HIL)		+= hil_ptr.o
 obj-$(CONFIG_MOUSE_VSXXXAA)	+= vsxxxaa.o
 obj-$(CONFIG_MOUSE_GPIO)	+= gpio_mouse.o
+obj-$(CONFIG_MOUSE_MAPLE)	+= maplemouse.o
 
 psmouse-objs := psmouse-base.o synaptics.o
 
diff --git a/drivers/input/mouse/maplemouse.c b/drivers/input/mouse/maplemouse.c
new file mode 100644
index 0000000..c714fa3
--- /dev/null
+++ b/drivers/input/mouse/maplemouse.c
@@ -0,0 +1,136 @@
+/*
+ *	SEGA Dreamcast mouse driver
+ *	Based on drivers/usb/usbmouse.c
+ *
+ *	Copyright Yaegashi Takeshi, 2001
+ *	Adrian McMenamin, 2008
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/maple.h>
+
+MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
+MODULE_DESCRIPTION("SEGA Dreamcast mouse driver");
+MODULE_LICENSE("GPL");
+
+struct dc_mouse {
+	struct input_dev *dev;
+	struct maple_device *mdev;
+};
+
+static void dc_mouse_callback(struct mapleq *mq)
+{
+	int buttons, relx, rely, relz;
+	struct maple_device *mapledev = mq->dev;
+	struct dc_mouse *mse = maple_get_drvdata(mapledev);
+	struct input_dev *dev = mse->dev;
+	unsigned char *res = mq->recvbuf;
+
+	buttons = ~res[8];
+	relx = *(unsigned short *)(res + 12) - 512;
+	rely = *(unsigned short *)(res + 14) - 512;
+	relz = *(unsigned short *)(res + 16) - 512;
+
+	input_report_key(dev, BTN_LEFT,   buttons & 4);
+	input_report_key(dev, BTN_MIDDLE, buttons & 9);
+	input_report_key(dev, BTN_RIGHT,  buttons & 2);
+	input_report_rel(dev, REL_X,      relx);
+	input_report_rel(dev, REL_Y,      rely);
+	input_report_rel(dev, REL_WHEEL,  relz);
+	input_sync(dev);
+}
+
+/* allow the mouse to be used */
+static int __devinit probe_maple_mouse(struct device *dev)
+{
+	struct maple_device *mdev;
+	struct maple_driver *mdrv;
+	int error;
+	struct input_dev *input_dev;
+	struct dc_mouse *mse;
+
+	mdev = to_maple_dev(dev);
+	mdrv = to_maple_driver(dev->driver);
+
+	mse = kzalloc(sizeof(struct dc_mouse), GFP_KERNEL);
+	if (!mse) {
+		error = -ENOMEM;
+		goto fail;
+	}
+
+	input_dev = input_allocate_device();
+	if (!input_dev) {
+		error = -ENOMEM;
+		goto fail_nomem;
+	}
+
+	mse->dev = input_dev;
+	mse->mdev = mdev;
+
+	input_set_drvdata(input_dev, mse);
+	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
+	input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
+		BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
+	input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) |
+		BIT_MASK(REL_WHEEL);
+	input_dev->name = mdev->product_name;
+	input_dev->id.bustype = BUS_HOST;
+	error =	input_register_device(input_dev);
+	if (error)
+		goto fail_register;
+
+	mdev->driver = mdrv;
+	maple_set_drvdata(mdev, mse);
+
+	maple_getcond_callback(mdev, dc_mouse_callback, HZ/50,
+		MAPLE_FUNC_MOUSE);
+
+	return error;
+
+fail_register:
+	input_free_device(input_dev);
+fail_nomem:
+	kfree(mse);
+fail:
+	return error;
+
+}
+
+static int remove_maple_mouse(struct device *dev)
+{
+	struct maple_device *mdev = to_maple_dev(dev);
+	struct dc_mouse *mse = maple_get_drvdata(mdev);
+
+	mdev->callback = NULL;
+	input_unregister_device(mse->dev);
+	maple_set_drvdata(mdev, NULL);
+	kfree(mse);
+	return 0;
+}
+
+static struct maple_driver dc_mouse_driver = {
+	.function =	MAPLE_FUNC_MOUSE,
+	.drv = {
+		.name = "Dreamcast_mouse",
+		.probe = probe_maple_mouse,
+		.remove = remove_maple_mouse,
+	},
+};
+
+static int __init dc_mouse_init(void)
+{
+	return maple_driver_register(&dc_mouse_driver);
+}
+
+static void __exit dc_mouse_exit(void)
+{
+	maple_driver_unregister(&dc_mouse_driver);
+}
+
+module_init(dc_mouse_init);
+module_exit(dc_mouse_exit);