USB: add driver for Meywa-Denki & Kayac YUREX

Meywa-Denki/Kayac YUREX is a leg-shakes sensor device.
See http://bbu.kayac.com/en/about/ for further information.
This driver support read/write the leg-shakes counter in the device
via a device file /dev/yurex[0-9]*.

[minor coding style cleanups fixed by gregkh]

Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama@gmail.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 566 insertions, 0 deletions

diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
index 55660eaf947c..1bfcd02ebeb5 100644
--- a/drivers/usb/misc/Kconfig
+++ b/drivers/usb/misc/Kconfig
@@ -231,3 +231,16 @@ config USB_ISIGHTFW
 	  driver beforehand. Tools for doing so are available at
 	  http://bersace03.free.fr
 
+config USB_YUREX
+	tristate "USB YUREX driver support"
+	depends on USB
+	help
+	  Say Y here if you want to connect a YUREX to your computer's
+	  USB port. The YUREX is a leg-shakes sensor. See
+	  <http://bbu.kayac.com/en/> for further information.
+	  This driver supports read/write of leg-shakes counter and
+	  fasync for the counter update via a device file /dev/yurex*.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called yurex.
+
diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile
index 717703e81425..d203ff6870e4 100644
--- a/drivers/usb/misc/Makefile
+++ b/drivers/usb/misc/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_USB_TEST)		+= usbtest.o
 obj-$(CONFIG_USB_TRANCEVIBRATOR)	+= trancevibrator.o
 obj-$(CONFIG_USB_USS720)	+= uss720.o
 obj-$(CONFIG_USB_SEVSEG)	+= usbsevseg.o
+obj-$(CONFIG_USB_YUREX)		+= yurex.o
 
 obj-$(CONFIG_USB_SISUSBVGA)	+= sisusbvga/
 
diff --git a/drivers/usb/misc/yurex.c b/drivers/usb/misc/yurex.c
new file mode 100644
index 000000000000..76b8ab47fe04
--- /dev/null
+++ b/drivers/usb/misc/yurex.c
@@ -0,0 +1,552 @@
+/*
+ * Driver for Meywa-Denki & KAYAC YUREX
+ *
+ * Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/kref.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/hid.h>
+
+#define DRIVER_AUTHOR "Tomoki Sekiyama"
+#define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX"
+
+#define YUREX_VENDOR_ID		0x0c45
+#define YUREX_PRODUCT_ID	0x1010
+
+#define CMD_ACK		'!'
+#define CMD_ANIMATE	'A'
+#define CMD_COUNT	'C'
+#define CMD_LED		'L'
+#define CMD_READ	'R'
+#define CMD_SET		'S'
+#define CMD_VERSION	'V'
+#define CMD_EOF		0x0d
+#define CMD_PADDING	0xff
+
+#define YUREX_BUF_SIZE		8
+#define YUREX_WRITE_TIMEOUT	(HZ)
+
+/* table of devices that work with this driver */
+static struct usb_device_id yurex_table[] = {
+	{ USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) },
+	{ }					/* Terminating entry */
+};
+MODULE_DEVICE_TABLE(usb, yurex_table);
+
+#ifdef CONFIG_USB_DYNAMIC_MINORS
+#define YUREX_MINOR_BASE       0
+#else
+#define YUREX_MINOR_BASE       224  /* not official yet */
+#endif
+
+/* Structure to hold all of our device specific stuff */
+struct usb_yurex {
+	struct usb_device	*udev;
+	struct usb_interface	*interface;
+	__u8			int_in_endpointAddr;
+	struct urb		*urb;		/* URB for interrupt in */
+	unsigned char           *int_buffer;	/* buffer for intterupt in */
+	struct urb		*cntl_urb;	/* URB for control msg */
+	struct usb_ctrlrequest	*cntl_req;	/* req for control msg */
+	unsigned char		*cntl_buffer;	/* buffer for control msg */
+
+	struct kref		kref;
+	struct mutex		io_mutex;
+	struct fasync_struct	*async_queue;
+	wait_queue_head_t	waitq;
+
+	spinlock_t		lock;
+	__s64			bbu;		/* BBU from device */
+};
+#define to_yurex_dev(d) container_of(d, struct usb_yurex, kref)
+
+static struct usb_driver yurex_driver;
+static const struct file_operations yurex_fops;
+
+
+static void yurex_control_callback(struct urb *urb)
+{
+	struct usb_yurex *dev = urb->context;
+	int status = urb->status;
+
+	if (status) {
+		err("%s - control failed: %dĽn", __func__, status);
+		wake_up_interruptible(&dev->waitq);
+		return;
+	}
+	/* on success, sender woken up by CMD_ACK int in, or timeout */
+}
+
+static void yurex_delete(struct kref *kref)
+{
+	struct usb_yurex *dev = to_yurex_dev(kref);
+
+	dbg("yurex_delete");
+
+	usb_put_dev(dev->udev);
+	if (dev->urb) {
+		usb_kill_urb(dev->urb);
+		if (dev->int_buffer)
+			usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
+				dev->int_buffer, dev->urb->transfer_dma);
+		usb_free_urb(dev->urb);
+	}
+	kfree(dev);
+}
+
+/*
+ * usb class driver info in order to get a minor number from the usb core,
+ * and to have the device registered with the driver core
+ */
+static struct usb_class_driver yurex_class = {
+	.name =		"yurex%d",
+	.fops =		&yurex_fops,
+	.minor_base =	YUREX_MINOR_BASE,
+};
+
+static void yurex_interrupt(struct urb *urb)
+{
+	struct usb_yurex *dev = urb->context;
+	unsigned char *buf = dev->int_buffer;
+	int status = urb->status;
+	unsigned long flags;
+	int retval, i;
+
+	switch (status) {
+	case 0: /*success*/
+		break;
+	case -EOVERFLOW:
+		err("%s - overflow with length %d, actual length is %d",
+		    __func__, YUREX_BUF_SIZE, dev->urb->actual_length);
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+	case -EILSEQ:
+		/* The device is terminated, clean up */
+		return;
+	default:
+		err("%s - unknown status received: %d", __func__, status);
+		goto exit;
+	}
+
+	/* handle received message */
+	switch (buf[0]) {
+	case CMD_COUNT:
+	case CMD_READ:
+		if (buf[6] == CMD_EOF) {
+			spin_lock_irqsave(&dev->lock, flags);
+			dev->bbu = 0;
+			for (i = 1; i < 6; i++) {
+				dev->bbu += buf[i];
+				if (i != 5)
+					dev->bbu <<= 8;
+			}
+			dbg("%s count: %lld", __func__, dev->bbu);
+			spin_unlock_irqrestore(&dev->lock, flags);
+
+			kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
+		}
+		else
+			dbg("data format error - no EOF");
+		break;
+	case CMD_ACK:
+		dbg("%s ack: %c", __func__, buf[1]);
+		wake_up_interruptible(&dev->waitq);
+		break;
+	}
+
+exit:
+	retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
+	if (retval) {
+		err("%s - usb_submit_urb failed: %d",
+			__func__, retval);
+	}
+}
+
+static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id)
+{
+	struct usb_yurex *dev;
+	struct usb_host_interface *iface_desc;
+	struct usb_endpoint_descriptor *endpoint;
+	int retval = -ENOMEM;
+	int i;
+	DEFINE_WAIT(wait);
+
+	/* allocate memory for our device state and initialize it */
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev) {
+		err("Out of memory");
+		goto error;
+	}
+	kref_init(&dev->kref);
+	mutex_init(&dev->io_mutex);
+	spin_lock_init(&dev->lock);
+	init_waitqueue_head(&dev->waitq);
+
+	dev->udev = usb_get_dev(interface_to_usbdev(interface));
+	dev->interface = interface;
+
+	/* set up the endpoint information */
+	iface_desc = interface->cur_altsetting;
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
+		endpoint = &iface_desc->endpoint[i].desc;
+
+		if (usb_endpoint_is_int_in(endpoint)) {
+			dev->int_in_endpointAddr = endpoint->bEndpointAddress;
+			break;
+		}
+	}
+	if (!dev->int_in_endpointAddr) {
+		retval = -ENODEV;
+		err("Could not find endpoints");
+		goto error;
+	}
+
+
+	/* allocate control URB */
+	dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!dev->cntl_urb) {
+		err("Could not allocate control URB");
+		goto error;
+	}
+
+	/* allocate buffer for control req */
+	dev->cntl_req = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
+					   GFP_KERNEL,
+					   &dev->cntl_urb->setup_dma);
+	if (!dev->cntl_req) {
+		err("Could not allocate cntl_req");
+		goto error;
+	}
+
+	/* allocate buffer for control msg */
+	dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
+					      GFP_KERNEL,
+					      &dev->cntl_urb->transfer_dma);
+	if (!dev->cntl_buffer) {
+		err("Could not allocate cntl_buffer");
+		goto error;
+	}
+
+	/* configure control URB */
+	dev->cntl_req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS |
+				      USB_RECIP_INTERFACE;
+	dev->cntl_req->bRequest	= HID_REQ_SET_REPORT;
+	dev->cntl_req->wValue	= cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8);
+	dev->cntl_req->wIndex	= cpu_to_le16(iface_desc->desc.bInterfaceNumber);
+	dev->cntl_req->wLength	= cpu_to_le16(YUREX_BUF_SIZE);
+
+	usb_fill_control_urb(dev->cntl_urb, dev->udev,
+			     usb_sndctrlpipe(dev->udev, 0),
+			     (void *)dev->cntl_req, dev->cntl_buffer,
+			     YUREX_BUF_SIZE, yurex_control_callback, dev);
+	dev->cntl_urb->transfer_flags	|= URB_NO_TRANSFER_DMA_MAP;
+
+
+	/* allocate interrupt URB */
+	dev->urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!dev->urb) {
+		err("Could not allocate URB");
+		goto error;
+	}
+
+	/* allocate buffer for interrupt in */
+	dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
+					GFP_KERNEL, &dev->urb->transfer_dma);
+	if (!dev->int_buffer) {
+		err("Could not allocate int_buffer");
+		goto error;
+	}
+
+	/* configure interrupt URB */
+	usb_fill_int_urb(dev->urb, dev->udev,
+			 usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr),
+			 dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt,
+			 dev, 1);
+	if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
+		retval = -EIO;
+		err("Could not submitting URB");
+		goto error;
+	}
+
+	/* save our data pointer in this interface device */
+	usb_set_intfdata(interface, dev);
+
+	/* we can register the device now, as it is ready */
+	retval = usb_register_dev(interface, &yurex_class);
+	if (retval) {
+		err("Not able to get a minor for this device.");
+		usb_set_intfdata(interface, NULL);
+		goto error;
+	}
+
+	dev->bbu = -1;
+
+	dev_info(&interface->dev,
+		 "USB Yurex device now attached to Yurex-%dĽn",
+		 interface->minor);
+
+	return 0;
+
+error:
+	if (dev)
+		/* this frees allocated memory */
+		kref_put(&dev->kref, yurex_delete);
+	return retval;
+}
+
+static void yurex_disconnect(struct usb_interface *interface)
+{
+	struct usb_yurex *dev;
+	int minor = interface->minor;
+
+	dev = usb_get_intfdata(interface);
+	usb_set_intfdata(interface, NULL);
+
+	/* give back our minor */
+	usb_deregister_dev(interface, &yurex_class);
+
+	/* prevent more I/O from starting */
+	mutex_lock(&dev->io_mutex);
+	dev->interface = NULL;
+	mutex_unlock(&dev->io_mutex);
+
+	/* wakeup waiters */
+	kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
+	wake_up_interruptible(&dev->waitq);
+
+	/* decrement our usage count */
+	kref_put(&dev->kref, yurex_delete);
+
+	dev_info(&interface->dev, "USB Yurex #%d now disconnected", minor);
+}
+
+static struct usb_driver yurex_driver = {
+	.name =		"yurex",
+	.probe =	yurex_probe,
+	.disconnect =	yurex_disconnect,
+	.id_table =	yurex_table,
+};
+
+
+static int yurex_fasync(int fd, struct file *file, int on)
+{
+	struct usb_yurex *dev;
+
+	dev = (struct usb_yurex *)file->private_data;
+	return fasync_helper(fd, file, on, &dev->async_queue);
+}
+
+static int yurex_open(struct inode *inode, struct file *file)
+{
+	struct usb_yurex *dev;
+	struct usb_interface *interface;
+	int subminor;
+	int retval = 0;
+
+	subminor = iminor(inode);
+
+	interface = usb_find_interface(&yurex_driver, subminor);
+	if (!interface) {
+		err("%s - error, can't find device for minor %d",
+		    __func__, subminor);
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	dev = usb_get_intfdata(interface);
+	if (!dev) {
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	/* increment our usage count for the device */
+	kref_get(&dev->kref);
+
+	/* save our object in the file's private structure */
+	mutex_lock(&dev->io_mutex);
+	file->private_data = dev;
+	mutex_unlock(&dev->io_mutex);
+
+exit:
+	return retval;
+}
+
+static int yurex_release(struct inode *inode, struct file *file)
+{
+	struct usb_yurex *dev;
+
+	dev = (struct usb_yurex *)file->private_data;
+	if (dev == NULL)
+		return -ENODEV;
+
+	yurex_fasync(-1, file, 0);
+
+	/* decrement the count on our device */
+	kref_put(&dev->kref, yurex_delete);
+	return 0;
+}
+
+static ssize_t yurex_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
+{
+	struct usb_yurex *dev;
+	int retval = 0;
+	int bytes_read = 0;
+	char in_buffer[20];
+	unsigned long flags;
+
+	dev = (struct usb_yurex *)file->private_data;
+
+	mutex_lock(&dev->io_mutex);
+	if (!dev->interface) {		/* already disconnected */
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	spin_lock_irqsave(&dev->lock, flags);
+	bytes_read = snprintf(in_buffer, 20, "%lldĽn", dev->bbu);
+	spin_unlock_irqrestore(&dev->lock, flags);
+
+	if (*ppos < bytes_read) {
+		if (copy_to_user(buffer, in_buffer + *ppos, bytes_read - *ppos))
+			retval = -EFAULT;
+		else {
+			retval = bytes_read - *ppos;
+			*ppos += bytes_read;
+		}
+	}
+
+exit:
+	mutex_unlock(&dev->io_mutex);
+	return retval;
+}
+
+static ssize_t yurex_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos)
+{
+	struct usb_yurex *dev;
+	int i, set = 0, retval = 0;
+	char buffer[16];
+	char *data = buffer;
+	unsigned long long c, c2 = 0;
+	signed long timeout = 0;
+	DEFINE_WAIT(wait);
+
+	count = min(sizeof(buffer), count);
+	dev = (struct usb_yurex *)file->private_data;
+
+	/* verify that we actually have some data to write */
+	if (count == 0)
+		goto error;
+
+	mutex_lock(&dev->io_mutex);
+	if (!dev->interface) {		/* alreaday disconnected */
+		mutex_unlock(&dev->io_mutex);
+		retval = -ENODEV;
+		goto error;
+	}
+
+	if (copy_from_user(buffer, user_buffer, count)) {
+		mutex_unlock(&dev->io_mutex);
+		retval = -EFAULT;
+		goto error;
+	}
+	memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE);
+
+	switch (buffer[0]) {
+	case CMD_ANIMATE:
+	case CMD_LED:
+		dev->cntl_buffer[0] = buffer[0];
+		dev->cntl_buffer[1] = buffer[1];
+		dev->cntl_buffer[2] = CMD_EOF;
+		break;
+	case CMD_READ:
+	case CMD_VERSION:
+		dev->cntl_buffer[0] = buffer[0];
+		dev->cntl_buffer[1] = 0x00;
+		dev->cntl_buffer[2] = CMD_EOF;
+		break;
+	case CMD_SET:
+		data++;
+		/* FALL THROUGH */
+	case '0' ... '9':
+		set = 1;
+		c = c2 = simple_strtoull(data, NULL, 0);
+		dev->cntl_buffer[0] = CMD_SET;
+		for (i = 1; i < 6; i++) {
+			dev->cntl_buffer[i] = (c>>32) & 0xff;
+			c <<= 8;
+		}
+		buffer[6] = CMD_EOF;
+		break;
+	default:
+		mutex_unlock(&dev->io_mutex);
+		return -EINVAL;
+	}
+
+	/* send the data as the control msg */
+	prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE);
+	dbg("%s - submit %c", __func__, dev->cntl_buffer[0]);
+	retval = usb_submit_urb(dev->cntl_urb, GFP_KERNEL);
+	if (retval >= 0)
+		timeout = schedule_timeout(YUREX_WRITE_TIMEOUT);
+	finish_wait(&dev->waitq, &wait);
+
+	mutex_unlock(&dev->io_mutex);
+
+	if (retval < 0) {
+		err("%s - failed to send bulk msg, error %d", __func__, retval);
+		goto error;
+	}
+	if (set && timeout)
+		dev->bbu = c2;
+	return timeout ? count : -EIO;
+
+error:
+	return retval;
+}
+
+static const struct file_operations yurex_fops = {
+	.owner =	THIS_MODULE,
+	.read =		yurex_read,
+	.write =	yurex_write,
+	.open =		yurex_open,
+	.release =	yurex_release,
+	.fasync	=	yurex_fasync,
+};
+
+
+static int __init usb_yurex_init(void)
+{
+	int result;
+
+	/* register this driver with the USB subsystem */
+	result = usb_register(&yurex_driver);
+	if (result)
+		err("usb_register failed. Error number %d", result);
+
+	return result;
+}
+
+static void __exit usb_yurex_exit(void)
+{
+	/* deregister this driver with the USB subsystem */
+	usb_deregister(&yurex_driver);
+}
+
+module_init(usb_yurex_init);
+module_exit(usb_yurex_exit);
+
+MODULE_LICENSE("GPL");