[PATCH] sh: maple: add Maple controller as a joystick device

[PATCH] sh: maple: add Maple controller as a joystick device

[Adrian McMenamin]

Now with proper checks for NULL pointers.


sh: maple: add Maple controller as joystick device

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

diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index be5c14a..ca7ce42 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -294,4 +294,17 @@ config JOYSTICK_XPAD_LEDS
 	  This option enables support for the LED which surrounds the Big X on
 	  XBox 360 controller.
 
+config JOYSTICK_MAPLE
+	tristate "Dreamcast control pad"
+	depends on SH_DREAMCAST
+	select MAPLE
+	help
+	  Say Y here if you have a SEGA Dreamcast and want to use your
+	  controller as a joystick.
+
+	  Most Dreamcast users will say Y.
+
+	  To compile this as a module choose M here: the module will be called
+	  maplecontrol.
+
 endif
diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile
index fdbf8c4..bfd848d 100644
--- a/drivers/input/joystick/Makefile
+++ b/drivers/input/joystick/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_JOYSTICK_AMIGA)		+= amijoy.o
 obj-$(CONFIG_JOYSTICK_ANALOG)		+= analog.o
 obj-$(CONFIG_JOYSTICK_COBRA)		+= cobra.o
 obj-$(CONFIG_JOYSTICK_DB9)		+= db9.o
+obj-$(CONFIG_JOYSTICK_MAPLE)		+= maplecontrol.o
 obj-$(CONFIG_JOYSTICK_GAMECON)		+= gamecon.o
 obj-$(CONFIG_JOYSTICK_GF2K)		+= gf2k.o
 obj-$(CONFIG_JOYSTICK_GRIP)		+= grip.o
diff --git a/drivers/input/joystick/maplecontrol.c b/drivers/input/joystick/maplecontrol.c
new file mode 100644
index 0000000..ca7d438
--- /dev/null
+++ b/drivers/input/joystick/maplecontrol.c
@@ -0,0 +1,211 @@
+/*
+ * 	SEGA Dreamcast controller driver
+ *	Based on drivers/usb/iforce.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 controller driver");
+MODULE_LICENSE("GPL");
+
+struct dc_pad {
+	struct input_dev *dev;
+	struct maple_device *mdev;
+};
+
+static void dc_pad_callback(struct mapleq *mq)
+{
+	unsigned short buttons;
+	struct maple_device *mapledev = mq->dev;
+	struct dc_pad *pad = maple_get_drvdata(mapledev);
+	struct input_dev *dev = pad->dev;
+	unsigned char *res = mq->recvbuf;
+
+	buttons = ~cpu_to_le16(*(unsigned short *)(res + 8));
+
+	input_report_abs(dev, ABS_HAT0Y,
+			 (buttons & 0x0010 ? -1:0) + (buttons & 0x0020 ? 1:0));
+	input_report_abs(dev, ABS_HAT0X,
+			 (buttons & 0x0040 ? -1:0) + (buttons & 0x0080 ? 1:0));
+	input_report_abs(dev, ABS_HAT1Y,
+			 (buttons & 0x1000 ? -1:0) + (buttons & 0x2000 ? 1:0));
+	input_report_abs(dev, ABS_HAT1X,
+			 (buttons & 0x4000 ? -1:0) + (buttons & 0x8000 ? 1:0));
+
+	input_report_key(dev, BTN_C,      buttons & 0x0001);
+	input_report_key(dev, BTN_B,      buttons & 0x0002);
+	input_report_key(dev, BTN_A,      buttons & 0x0004);
+	input_report_key(dev, BTN_START,  buttons & 0x0008);
+	input_report_key(dev, BTN_Z,      buttons & 0x0100);
+	input_report_key(dev, BTN_Y,      buttons & 0x0200);
+	input_report_key(dev, BTN_X,      buttons & 0x0400);
+	input_report_key(dev, BTN_SELECT, buttons & 0x0800);
+
+	input_report_abs(dev, ABS_GAS,   res[10]);
+	input_report_abs(dev, ABS_BRAKE, res[11]);
+	input_report_abs(dev, ABS_X,     res[12]);
+	input_report_abs(dev, ABS_Y,     res[13]);
+	input_report_abs(dev, ABS_RX,    res[14]);
+	input_report_abs(dev, ABS_RY,    res[15]);
+}
+
+static int dc_pad_open(struct input_dev *dev)
+{
+	struct dc_pad *pad;
+
+	pad = dev->dev.platform_data;
+	maple_getcond_callback(pad->mdev, dc_pad_callback, HZ/20,
+		MAPLE_FUNC_CONTROLLER);
+	return 0;
+}
+
+static void dc_pad_close(struct input_dev *dev)
+{
+	struct dc_pad *pad;
+	
+	pad = dev->dev.platform_data;
+	maple_getcond_callback(pad->mdev, dc_pad_callback, 0,
+		MAPLE_FUNC_CONTROLLER);
+}
+
+/* allow the controller to be used */
+static int probe_maple_controller(struct device *dev)
+{
+	struct maple_device *mdev;
+	struct maple_driver *mdrv;
+	int i, error;
+	struct dc_pad *pad;
+	struct input_dev *idev;
+	unsigned long data;
+	const short btn_bit[32] = {
+		BTN_C, BTN_B, BTN_A, BTN_START, -1, -1, -1, -1,
+		BTN_Z, BTN_Y, BTN_X, BTN_SELECT, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1,
+	};
+	const short abs_bit[32] = {
+		-1, -1, -1, -1, ABS_HAT0Y, ABS_HAT0Y, ABS_HAT0X, ABS_HAT0X,
+		-1, -1, -1, -1, ABS_HAT1Y, ABS_HAT1Y, ABS_HAT1X, ABS_HAT1X,
+		ABS_GAS, ABS_BRAKE, ABS_X, ABS_Y, ABS_RX, ABS_RY, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1,
+	};
+
+	mdev = to_maple_dev(dev);
+	if (!mdev) {
+		error = EINVAL;
+		goto fail;
+	}
+	
+	mdrv = to_maple_driver(dev->driver);
+	if (!mdrv) {
+		error = EINVAL;
+		goto fail;
+	}
+
+	data = be32_to_cpu(mdev->devinfo.function_data[0]);
+
+	pad = kzalloc(sizeof(struct dc_pad), GFP_KERNEL);
+	if (!pad) {
+		error = ENOMEM;
+		goto fail;
+	}
+	idev = input_allocate_device();
+	if (!idev){
+		error = ENOMEM;
+		goto fail_idev;
+	}
+
+	pad->dev = idev;
+	pad->mdev = mdev;
+
+	idev->open = dc_pad_open;
+	idev->close = dc_pad_close;
+
+	for (i = 0; i < 32; i++)
+		if (data & (1<<i) && btn_bit[i] >= 0)
+			idev->keybit[BIT_WORD(BTN_JOYSTICK)] |= BIT_MASK(btn_bit[i]);
+
+	if (idev->keybit[BTN_JOYSTICK/32])
+		idev->evbit[0] |= BIT_MASK(EV_KEY);
+
+	for (i = 0; i < 32; i++)
+		if (data & (1<<i) && abs_bit[i] >= 0)
+			idev->absbit[0] |= BIT_MASK(abs_bit[i]);
+
+	if (idev->absbit[0])
+		idev->evbit[0] |= BIT_MASK(EV_ABS);
+
+	for (i = ABS_X; i <= ABS_BRAKE; i++)
+		input_set_abs_params(idev, i, 0, 255, 0, 0);
+
+	for (i = ABS_HAT0X; i <= ABS_HAT3Y; i++)
+		input_set_abs_params(idev, i, 1, -1, 0, 0);
+
+	idev->dev.platform_data = pad;
+	idev->event = NULL;
+	idev->dev.parent = &mdev->dev;
+	idev->name = mdev->product_name;
+	idev->id.bustype = BUS_HOST;
+	input_set_drvdata(idev, pad);
+
+	error = input_register_device(idev);
+	if (error)
+		goto fail_register;
+
+	mdev->driver = mdrv;
+	maple_set_drvdata(mdev, pad);
+
+	return error;
+
+fail_register:
+	maple_set_drvdata(mdev, NULL);
+	input_free_device(pad->dev);
+fail_idev:
+	kfree(pad);
+fail:
+	return -error;
+}
+
+static int remove_maple_controller(struct device *dev)
+{
+	struct maple_device *mdev = to_maple_dev(dev);
+	struct dc_pad *pad = maple_get_drvdata(mdev);
+
+	mdev->callback = NULL;
+	input_unregister_device(pad->dev);
+	maple_set_drvdata(mdev, NULL);
+	kfree(pad);
+	return 0;
+}
+
+static struct maple_driver dc_pad_driver = {
+	.function =	MAPLE_FUNC_CONTROLLER,
+	.drv = {
+		.name = "Dreamcast_controller",
+		.probe = probe_maple_controller,
+		.remove = remove_maple_controller,
+	},
+};
+
+static int __init dc_pad_init(void)
+{
+	return 	maple_driver_register(&dc_pad_driver);
+}
+
+static void __exit dc_pad_exit(void)
+{
+	maple_driver_unregister(&dc_pad_driver);
+}
+
+module_init(dc_pad_init);
+module_exit(dc_pad_exit);

Re: [PATCH] sh: maple: add Maple controller as a joystick device

[Dmitry Torokhov]

On Saturday 20 December 2008 10:26:54 Adrian McMenamin wrote:
> +       mdev = to_maple_dev(dev);
> +       if (!mdev) {
> +               error = EINVAL;
> +               goto fail;
> +       }
> +       
> +       mdrv = to_maple_driver(dev->driver);
> +       if (!mdrv) {
> +               error = EINVAL;
> +               goto fail;
> +       }

This will never happen - to_maple_* are simple wrappers around container_of 
and so the result will never be NULL but some small offset from it if dev is 
NULL. I'm staying on the old version of the patch with small fixups.

-- 
Dmitry

Re: [PATCH] sh: maple: add Maple controller as a joystick device

[Mike Frysinger]

[-- Attachment #1: Type: text/plain, Size: 1078 bytes --]

On Saturday 20 December 2008 13:26:54 Adrian McMenamin wrote:
> +static int probe_maple_controller(struct device *dev)
> +{
> ...
> +	mdev = to_maple_dev(dev);
> +	if (!mdev) {
> +		error = EINVAL;
> +		goto fail;
> +	}
> +
> +	mdrv = to_maple_driver(dev->driver);
> +	if (!mdrv) {
> +		error = EINVAL;
> +		goto fail;
> +	}

like Dmitry said, these NULL checks make no sense

> +	pad = kzalloc(sizeof(struct dc_pad), GFP_KERNEL);
> +	if (!pad) {
> +		error = ENOMEM;
> +		goto fail;
> +	}
> +	idev = input_allocate_device();
> +	if (!idev){
> +		error = ENOMEM;
> +		goto fail_idev;
> +	}
> ...
> +	error = input_register_device(idev);
> +	if (error)
> +		goto fail_register;
> ...
> +fail_register:
> +	maple_set_drvdata(mdev, NULL);
> +	input_free_device(pad->dev);
> +fail_idev:
> +	kfree(pad);
> +fail:
> +	return -error;
> +}

this -error stuff is weird and i think wrong.  for constants, you're adding 
overhead, and for the input_register_device(), i think you're negating an 
already negative value thus breaking it.
-mike

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