Date:	Mon, 8 Oct 2012 17:29:43 -0400
From:	"Maxin B. John" <maxin.john@...il.com>
To:	gregkh@...uxfoundation.org, devel@...uxdriverproject.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] Support for OWI/Maplin USB Robotic Arm

Hi Greg,

This driver helps us to control the OWI/Maplin USB Robotic Arm device.

I have tested this driver in my x86 Laptop and it works as expected
(Some clean-ups and modifications are in the pipeline, though).

After review process and the life in staging,I hope this driver will
find it's place in "drivers/usb/misc/" :)

The userspace utility program is available from the below URL:
https://github.com/maxinbjohn/robotic_arm_driver

OWI/Maplin USB Robotic arm is available from:
http://www.maplin.co.uk/robotic-arm-kit-with-usb-pc-interface-266257
http://www.owirobots.com/cart/html/owi-535pc-robotic-arm-kit-with-usb-pc-interface-assembled.html

Please let me know your comments.

Signed-off-by: Maxin B. John <maxin.john@...il.com>
---
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index d805eef..a1eefa9 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -144,4 +144,6 @@ source "drivers/staging/imx-drm/Kconfig"
 
 source "drivers/staging/dgrp/Kconfig"
 
+source "drivers/staging/usb_robotic_arm/Kconfig"
+
 endif # STAGING
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 76e2ebd..fd9b5f3 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -64,3 +64,4 @@ obj-$(CONFIG_NET_VENDOR_SILICOM)	+= silicom/
 obj-$(CONFIG_CED1401)		+= ced1401/
 obj-$(CONFIG_DRM_IMX)		+= imx-drm/
 obj-$(CONFIG_DGRP)		+= dgrp/
+obj-$(CONFIG_USB_ROBOTIC_ARM)	+= usb_robotic_arm/
diff --git a/drivers/staging/usb_robotic_arm/Kconfig b/drivers/staging/usb_robotic_arm/Kconfig
new file mode 100644
index 0000000..7ac4547
--- /dev/null
+++ b/drivers/staging/usb_robotic_arm/Kconfig
@@ -0,0 +1,15 @@
+config USB_ROBOTIC_ARM
+	tristate "OWI/MAPLIN USB Robotic Arm support"
+	depends on USB
+	default N
+	---help---
+	  This enables us to control the OWI/Maplin Robotic Arm
+	  device attached to the USB port.
+
+	  For more details, and to get the userspace utility
+	  programs, please see https://github.com/maxinbjohn/robotic_arm_driver
+
+	  To compile this as a module, choose M here: the module will
+	  be called robotic_arm.
+
+	  If unsure, say N.
diff --git a/drivers/staging/usb_robotic_arm/Makefile b/drivers/staging/usb_robotic_arm/Makefile
new file mode 100644
index 0000000..9509413
--- /dev/null
+++ b/drivers/staging/usb_robotic_arm/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_USB_ROBOTIC_ARM)             += robotic_arm.o
diff --git a/drivers/staging/usb_robotic_arm/README b/drivers/staging/usb_robotic_arm/README
new file mode 100644
index 0000000..f7998ef
--- /dev/null
+++ b/drivers/staging/usb_robotic_arm/README
@@ -0,0 +1,59 @@
+
+The USB_ROBOTIC_ARM is a proof-of-concept driver for the OWI/Maplin USB
+Robotic Arm. I created it for fun. So, don't expect much from it.
+
+INSTALLATION:
+
+Select the 'USB ROBOTIC ARM' and build the kernel.
+
+If we build it as module, locate the robotic_arm.ko
+
+As 'root', insert the module:
+# insmod robotic_arm.ko
+# dmesg
+[ 8808.461441] usbcore: registered new interface driver robotic_arm
+
+Connect the Robotic Arm to the PC.
+
+# dmesg
+...
+[ 8718.729311] robotic_arm 5-1:1.0: USB ROBOTIC ARM now attached
+
+# cd /sys/bus/usb/drivers/robotic_arm/
+In my case,
+# ls
+5-1:1.0  bind  module  new_id  remove_id  uevent  unbind
+
+# cd 5-1:1.0
+# ls
+bAlternateSetting  bInterfaceNumber    bNumEndpoints  gripmotor  motor2  power                 uevent
+basemotor          bInterfaceProtocol  driver         led        motor3  subsystem
+bInterfaceClass    bInterfaceSubClass  ep_81          modalias   motor4  supports_autosuspend
+
+TESTING:
+
+# echo 1 > basemotor
+(This will rotate the base clockwise)
+
+# echo 2 > basemotor
+(This will rotate the base anti-clockwise)
+
+# echo 0 > basemotor
+(This will stop the base motor if it is on)
+
+# echo 1 > led
+(This will switch on the front side LED)
+
+# echo 1 > motor3
+(This will switch on motor3)
+
+HARDWARE AVAILABILITY:
+
+OWI/Maplin USB Robotic arm is available from:
+http://www.maplin.co.uk/robotic-arm-kit-with-usb-pc-interface-266257
+http://www.owirobots.com/cart/html/owi-535pc-robotic-arm-kit-with-usb-pc-interface-assembled.html
+
+REFERENCES:
+
+Reverse Engineering details of Robotic Arm's Protocol is available here:
+http://notbrainsurgery.livejournal.com/38622.html
diff --git a/drivers/staging/usb_robotic_arm/TODO b/drivers/staging/usb_robotic_arm/TODO
new file mode 100644
index 0000000..6c0fd7e
--- /dev/null
+++ b/drivers/staging/usb_robotic_arm/TODO
@@ -0,0 +1,8 @@
+TODO:
+	- provide independent control for motors in the hand
+	- various code clean-ups
+	- test on various platforms
+	- send to lkml for review
+
+Please send patches to Greg Kroah-Hartman <gregkh@...uxfoundation.org>
+and Cc: Maxin B. John <maxin.john@...il.com>
diff --git a/drivers/staging/usb_robotic_arm/robotic_arm.c b/drivers/staging/usb_robotic_arm/robotic_arm.c
new file mode 100644
index 0000000..dbde911
--- /dev/null
+++ b/drivers/staging/usb_robotic_arm/robotic_arm.c
@@ -0,0 +1,278 @@
+/*
+ * USB ROBOTIC ARM driver
+ * robotic_arm - driver for Robotic ARM with USB interface
+ * from Maplin Electronics.This is an experimental driver.
+ * Use at your own risk.
+ *
+ * Copyright (C) 2012 Maxin B. John (maxin.john@...il.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2.
+ *
+ * Derived from USB LED driver
+ * Copyright (c) 2001 Greg Kroah-Hartman (greg@...ah.com)
+ */
+
+#define DEBUG 1
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+
+/* Version Information */
+#define DRIVER_VERSION "v0.1"
+#define DRIVER_AUTHOR "Maxin B. John, maxin.john@...il.com"
+#define DRIVER_DESC "USB ROBOTIC ARM Driver"
+
+#define VENDOR_ID       0x1267
+#define PRODUCT_ID      0x0000
+
+/* table of devices that work with this driver */
+static struct usb_device_id id_table[] = {
+	{.idVendor = 0x1267, .match_flags = USB_DEVICE_ID_MATCH_VENDOR,},
+	{},
+};
+
+MODULE_DEVICE_TABLE(usb, id_table);
+
+struct usb_robotic_arm {
+	struct usb_device *udev;
+	unsigned char led;
+	unsigned char gripmotor;
+	unsigned char motor2;
+	unsigned char motor3;
+	unsigned char motor4;
+	unsigned char basemotor;
+};
+
+static void update_robotic_arm(struct usb_robotic_arm *robotic_arm)
+{
+	int retval = 0;
+	u8 cmd[3];
+
+	cmd[0] = 0;
+	cmd[1] = 0;
+	cmd[2] = 0;
+
+	/*
+	 * Byte 2 controls LED light inside the grip.
+	 * If Bit 0 is 1, LED on, otherwise LED off
+	 *
+	 */
+
+	if (robotic_arm->led)
+		cmd[2] = 1;
+
+	/*
+	 * Byte 1 controls the Base Motor
+	 * If value is 1, Base Motor rotates clockwise
+	 * If value is 2, Base Motor rotates anti-clockwise
+	 * Otherwise, Base Motor is off
+	 *
+	 */
+
+	if (robotic_arm->basemotor == 1)
+		cmd[1] = 1;
+
+	else if (robotic_arm->basemotor == 2)
+		cmd[1] = 2;
+	else
+		cmd[1] = 0;
+
+	/*
+	 * Byte 0 controls the Grip
+	 * If value is 1, Grip tightens
+	 * If values is 2, Grip Looses
+	 *
+	 */
+
+	if (robotic_arm->gripmotor == 1)
+		cmd[0] = 1;
+	else if (robotic_arm->gripmotor == 2)
+		cmd[0] = 2;
+	/*
+	 * Byte 0 controls the Motor 2
+	 * If value is 1, Motor 2 (wrist) moves up
+	 * If value is 2, Motor 2 (wrist) moves down
+	 *
+	 */
+
+	else if (robotic_arm->motor2 == 1)
+		cmd[0] = 4;
+	else if (robotic_arm->motor2 == 2)
+		cmd[0] = 8;
+
+	/*
+	 * Byte 0 controls the Motor 3
+	 * If value is 1, Motor 3 (elbow) moves up
+	 * If value is 2, Motor 3 (elbow) moves down
+	 *
+	 */
+
+	else if (robotic_arm->motor3 == 1)
+		cmd[0] = 16;
+	else if (robotic_arm->motor3 == 2)
+		cmd[0] = 32;
+
+	/*
+	 * Byte 0 controls the Motor 4
+	 * If value is 1, Motor 4 (shoulder) moves up
+	 * If value is 2, Motor 4 (shoulder) moves down
+	 *
+	 */
+
+	else if (robotic_arm->motor4 == 1)
+		cmd[0] = 64;
+	else if (robotic_arm->motor4 == 2)
+		cmd[0] = 128;
+	else
+		cmd[0] = 0;
+
+	retval = usb_control_msg(robotic_arm->udev,
+				 usb_sndctrlpipe(robotic_arm->udev, 0),
+				 6, 0x40, 0x100, 0, cmd, 3, 0);
+
+
+	if (retval)
+		dev_dbg(&robotic_arm->udev->dev, "retval = %d\n", retval);
+
+}
+
+#define show_set(value) \
+static ssize_t show_##value(struct device *dev, struct device_attribute *attr,\
+			char *buf)					\
+{									\
+	struct usb_interface *intf = to_usb_interface(dev);		\
+	struct usb_robotic_arm *robotic_arm = usb_get_intfdata(intf);	\
+									\
+	return sprintf(buf, "%d\n", robotic_arm->value);		\
+}                                                                       \
+static ssize_t set_##value(struct device *dev, struct device_attribute *attr,\
+				const char *buf, size_t count)		\
+{                                                                       \
+	struct usb_interface *intf = to_usb_interface(dev);             \
+	struct usb_robotic_arm *robotic_arm = usb_get_intfdata(intf);   \
+	int ret = -ENXIO;						\
+	unsigned long val;						\
+									\
+	ret = kstrtoul(buf, 0, &val);					\
+	if (ret)							\
+		return ret;						\
+	robotic_arm->value = val;					\
+	update_robotic_arm(robotic_arm);                                \
+	return count;                                                   \
+}                                                                       \
+static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, show_##value, set_##value);
+show_set(led);
+show_set(gripmotor);
+show_set(motor2);
+show_set(motor3);
+show_set(motor4);
+show_set(basemotor);
+
+static int robotic_arm_probe(struct usb_interface *interface,
+			     const struct usb_device_id *id)
+{
+	struct usb_device *udev;
+	struct usb_robotic_arm *dev;
+	int retval = -ENOMEM;
+
+	udev = interface_to_usbdev(interface);
+	dev = kzalloc(sizeof(struct usb_robotic_arm), GFP_KERNEL);
+	if (dev == NULL) {
+		dev_err(&interface->dev, "out of memory\n");
+		goto error_mem;
+	}
+
+	dev->udev = usb_get_dev(udev);
+
+	usb_set_intfdata(interface, dev);
+
+	retval = device_create_file(&interface->dev, &dev_attr_led);
+	if (retval)
+		goto error;
+	retval = device_create_file(&interface->dev, &dev_attr_gripmotor);
+	if (retval)
+		goto error;
+	retval = device_create_file(&interface->dev, &dev_attr_motor2);
+	if (retval)
+		goto error;
+	retval = device_create_file(&interface->dev, &dev_attr_motor3);
+	if (retval)
+		goto error;
+	retval = device_create_file(&interface->dev, &dev_attr_motor4);
+	if (retval)
+		goto error;
+	retval = device_create_file(&interface->dev, &dev_attr_basemotor);
+	if (retval)
+		goto error;
+
+	dev_info(&interface->dev, "USB ROBOTIC ARM now attached\n");
+	return 0;
+
+error:
+	device_remove_file(&interface->dev, &dev_attr_led);
+	device_remove_file(&interface->dev, &dev_attr_gripmotor);
+	device_remove_file(&interface->dev, &dev_attr_motor2);
+	device_remove_file(&interface->dev, &dev_attr_motor3);
+	device_remove_file(&interface->dev, &dev_attr_motor4);
+	device_remove_file(&interface->dev, &dev_attr_basemotor);
+
+	usb_set_intfdata(interface, NULL);
+	usb_put_dev(dev->udev);
+	kfree(dev);
+
+error_mem:
+	return retval;
+}
+
+static void robotic_arm_disconnect(struct usb_interface *interface)
+{
+	struct usb_robotic_arm *dev = NULL;
+
+	dev = usb_get_intfdata(interface);
+
+	device_remove_file(&interface->dev, &dev_attr_led);
+	device_remove_file(&interface->dev, &dev_attr_gripmotor);
+	device_remove_file(&interface->dev, &dev_attr_motor2);
+	device_remove_file(&interface->dev, &dev_attr_motor3);
+	device_remove_file(&interface->dev, &dev_attr_motor4);
+	device_remove_file(&interface->dev, &dev_attr_basemotor);
+
+	/* first remove the files, then set the pointer to NULL */
+	usb_set_intfdata(interface, NULL);
+
+	usb_put_dev(dev->udev);
+
+	kfree(dev);
+
+	dev_info(&interface->dev, "USB ROBOTIC ARM now disconnected\n");
+}
+
+static struct usb_driver robotic_arm_driver = {
+	.name = "robotic_arm",
+	.probe = robotic_arm_probe,
+	.disconnect = robotic_arm_disconnect,
+	.id_table = id_table,
+};
+
+static int __init usb_robotic_arm_init(void)
+{
+	return usb_register(&robotic_arm_driver);
+}
+
+static void __exit usb_robotic_arm_exit(void)
+{
+	usb_deregister(&robotic_arm_driver);
+}
+
+module_init(usb_robotic_arm_init);
+module_exit(usb_robotic_arm_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
--
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