[deliverable/linux.git] / drivers / usb / misc / yurex.c

/*
 * 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/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*2)

/* 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	192
#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) {
		dev_err(&urb->dev->dev, "%s - control failed: %d\n",
			__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);

	dev_dbg(&dev->interface->dev, "%s\n", __func__);

	usb_put_dev(dev->udev);
	if (dev->cntl_urb) {
		usb_kill_urb(dev->cntl_urb);
		kfree(dev->cntl_req);
		if (dev->cntl_buffer)
			usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
				dev->cntl_buffer, dev->cntl_urb->transfer_dma);
		usb_free_urb(dev->cntl_urb);
	}
	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:
		dev_err(&dev->interface->dev,
			"%s - overflow with length %d, actual length is %d\n",
			__func__, YUREX_BUF_SIZE, dev->urb->actual_length);
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
	case -EILSEQ:
		/* The device is terminated, clean up */
		return;
	default:
		dev_err(&dev->interface->dev,
			"%s - unknown status received: %d\n", __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;
			}
			dev_dbg(&dev->interface->dev, "%s count: %lld\n",
				__func__, dev->bbu);
			spin_unlock_irqrestore(&dev->lock, flags);

			kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
		}
		else
			dev_dbg(&dev->interface->dev,
				"data format error - no EOF\n");
		break;
	case CMD_ACK:
		dev_dbg(&dev->interface->dev, "%s ack: %c\n",
			__func__, buf[1]);
		wake_up_interruptible(&dev->waitq);
		break;
	}

exit:
	retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
	if (retval) {
		dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n",
			__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)
		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;
		dev_err(&interface->dev, "Could not find endpoints\n");
		goto error;
	}


	/* allocate control URB */
	dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->cntl_urb)
		goto error;

	/* allocate buffer for control req */
	dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL);
	if (!dev->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) {
		dev_err(&interface->dev, "Could not allocate cntl_buffer\n");
		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)
		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) {
		dev_err(&interface->dev, "Could not allocate int_buffer\n");
		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);
	dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
	if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
		retval = -EIO;
		dev_err(&interface->dev, "Could not submitting URB\n");
		goto error;
	}

	/* save our data pointer in this interface device */
	usb_set_intfdata(interface, dev);
	dev->bbu = -1;

	/* we can register the device now, as it is ready */
	retval = usb_register_dev(interface, &yurex_class);
	if (retval) {
		dev_err(&interface->dev,
			"Not able to get a minor for this device.\n");
		usb_set_intfdata(interface, NULL);
		goto error;
	}

	dev_info(&interface->dev,
		 "USB YUREX device now attached to Yurex #%d\n",
		 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\n", 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 = 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) {
		printk(KERN_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 = file->private_data;
	if (dev == NULL)
		return -ENODEV;

	/* decrement the count on our device */
	kref_put(&dev->kref, yurex_delete);
	return 0;
}

static ssize_t yurex_read(struct file *file, char __user *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 = 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, "%lld\n", 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 *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 = 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) {		/* already 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);
	dev_dbg(&dev->interface->dev, "%s - submit %c\n", __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) {
		dev_err(&dev->interface->dev,
			"%s - failed to send bulk msg, error %d\n",
			__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,
	.llseek =	default_llseek,
};

module_usb_driver(yurex_driver);

MODULE_LICENSE("GPL");
Commit	Line	Data
6bc235a2 TS	1	/*
	2	* Driver for Meywa-Denki & KAYAC YUREX
	3	*
	4	* Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License as
	8	* published by the Free Software Foundation, version 2.
	9	*
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/errno.h>
6bc235a2 TS	14	#include <linux/slab.h>
	15	#include <linux/module.h>
	16	#include <linux/kref.h>
	17	#include <linux/mutex.h>
	18	#include <linux/uaccess.h>
	19	#include <linux/usb.h>
	20	#include <linux/hid.h>
	21
	22	#define DRIVER_AUTHOR "Tomoki Sekiyama"
	23	#define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX"
	24
	25	#define YUREX_VENDOR_ID 0x0c45
	26	#define YUREX_PRODUCT_ID 0x1010
	27
	28	#define CMD_ACK '!'
	29	#define CMD_ANIMATE 'A'
	30	#define CMD_COUNT 'C'
	31	#define CMD_LED 'L'
	32	#define CMD_READ 'R'
	33	#define CMD_SET 'S'
	34	#define CMD_VERSION 'V'
	35	#define CMD_EOF 0x0d
	36	#define CMD_PADDING 0xff
	37
	38	#define YUREX_BUF_SIZE 8
e06ea97f	39	#define YUREX_WRITE_TIMEOUT (HZ*2)
6bc235a2 TS	40
	41	/* table of devices that work with this driver */
	42	static struct usb_device_id yurex_table[] = {
	43	{ USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) },
	44	{ } /* Terminating entry */
	45	};
	46	MODULE_DEVICE_TABLE(usb, yurex_table);
	47
	48	#ifdef CONFIG_USB_DYNAMIC_MINORS
1b62d258	49	#define YUREX_MINOR_BASE 0
6bc235a2	50	#else
1b62d258	51	#define YUREX_MINOR_BASE 192
6bc235a2 TS	52	#endif
	53
	54	/* Structure to hold all of our device specific stuff */
	55	struct usb_yurex {
	56	struct usb_device *udev;
	57	struct usb_interface *interface;
	58	__u8 int_in_endpointAddr;
	59	struct urb urb; / URB for interrupt in */
	60	unsigned char int_buffer; / buffer for intterupt in */
	61	struct urb cntl_urb; / URB for control msg */
	62	struct usb_ctrlrequest cntl_req; / req for control msg */
	63	unsigned char cntl_buffer; / buffer for control msg */
	64
	65	struct kref kref;
	66	struct mutex io_mutex;
	67	struct fasync_struct *async_queue;
	68	wait_queue_head_t waitq;
	69
	70	spinlock_t lock;
	71	__s64 bbu; /* BBU from device */
	72	};
	73	#define to_yurex_dev(d) container_of(d, struct usb_yurex, kref)
	74
	75	static struct usb_driver yurex_driver;
	76	static const struct file_operations yurex_fops;
	77
	78
	79	static void yurex_control_callback(struct urb *urb)
	80	{
	81	struct usb_yurex *dev = urb->context;
	82	int status = urb->status;
	83
	84	if (status) {
45714104 GKH	85	dev_err(&urb->dev->dev, "%s - control failed: %d\n",
45714104 GKH	86	__func__, status);
6bc235a2 TS	87	wake_up_interruptible(&dev->waitq);
	88	return;
	89	}
	90	/* on success, sender woken up by CMD_ACK int in, or timeout */
	91	}
	92
	93	static void yurex_delete(struct kref *kref)
	94	{
	95	struct usb_yurex *dev = to_yurex_dev(kref);
	96
aadd6472	97	dev_dbg(&dev->interface->dev, "%s\n", __func__);
6bc235a2 TS	98
6bc235a2 TS	99	usb_put_dev(dev->udev);
e06ea97f TS	100	if (dev->cntl_urb) {
e06ea97f TS	101	usb_kill_urb(dev->cntl_urb);
523fc5c1	102	kfree(dev->cntl_req);
e06ea97f TS	103	if (dev->cntl_buffer)
	104	usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
	105	dev->cntl_buffer, dev->cntl_urb->transfer_dma);
	106	usb_free_urb(dev->cntl_urb);
	107	}
6bc235a2 TS	108	if (dev->urb) {
	109	usb_kill_urb(dev->urb);
	110	if (dev->int_buffer)
	111	usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
	112	dev->int_buffer, dev->urb->transfer_dma);
	113	usb_free_urb(dev->urb);
	114	}
	115	kfree(dev);
	116	}
	117
	118	/*
	119	* usb class driver info in order to get a minor number from the usb core,
	120	* and to have the device registered with the driver core
	121	*/
	122	static struct usb_class_driver yurex_class = {
	123	.name = "yurex%d",
	124	.fops = &yurex_fops,
	125	.minor_base = YUREX_MINOR_BASE,
	126	};
	127
	128	static void yurex_interrupt(struct urb *urb)
	129	{
	130	struct usb_yurex *dev = urb->context;
	131	unsigned char *buf = dev->int_buffer;
	132	int status = urb->status;
	133	unsigned long flags;
	134	int retval, i;
	135
	136	switch (status) {
	137	case 0: /success/
	138	break;
	139	case -EOVERFLOW:
45714104 GKH	140	dev_err(&dev->interface->dev,
	141	"%s - overflow with length %d, actual length is %d\n",
	142	__func__, YUREX_BUF_SIZE, dev->urb->actual_length);
6bc235a2 TS	143	case -ECONNRESET:
	144	case -ENOENT:
	145	case -ESHUTDOWN:
	146	case -EILSEQ:
	147	/* The device is terminated, clean up */
	148	return;
	149	default:
45714104 GKH	150	dev_err(&dev->interface->dev,
45714104 GKH	151	"%s - unknown status received: %d\n", __func__, status);
6bc235a2 TS	152	goto exit;
	153	}
	154
	155	/* handle received message */
	156	switch (buf[0]) {
	157	case CMD_COUNT:
	158	case CMD_READ:
	159	if (buf[6] == CMD_EOF) {
	160	spin_lock_irqsave(&dev->lock, flags);
	161	dev->bbu = 0;
	162	for (i = 1; i < 6; i++) {
	163	dev->bbu += buf[i];
	164	if (i != 5)
	165	dev->bbu <<= 8;
	166	}
aadd6472 GKH	167	dev_dbg(&dev->interface->dev, "%s count: %lld\n",
aadd6472 GKH	168	__func__, dev->bbu);
6bc235a2 TS	169	spin_unlock_irqrestore(&dev->lock, flags);
	170
	171	kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
	172	}
	173	else
aadd6472 GKH	174	dev_dbg(&dev->interface->dev,
aadd6472 GKH	175	"data format error - no EOF\n");
6bc235a2 TS	176	break;
6bc235a2 TS	177	case CMD_ACK:
aadd6472 GKH	178	dev_dbg(&dev->interface->dev, "%s ack: %c\n",
aadd6472 GKH	179	__func__, buf[1]);
6bc235a2 TS	180	wake_up_interruptible(&dev->waitq);
	181	break;
	182	}
	183
	184	exit:
	185	retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
	186	if (retval) {
45714104	187	dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n",
6bc235a2 TS	188	__func__, retval);
	189	}
	190	}
	191
	192	static int yurex_probe(struct usb_interface interface, const struct usb_device_id id)
	193	{
	194	struct usb_yurex *dev;
	195	struct usb_host_interface *iface_desc;
	196	struct usb_endpoint_descriptor *endpoint;
	197	int retval = -ENOMEM;
	198	int i;
	199	DEFINE_WAIT(wait);
	200
	201	/* allocate memory for our device state and initialize it */
	202	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
0c2bc5c2	203	if (!dev)
6bc235a2	204	goto error;
6bc235a2 TS	205	kref_init(&dev->kref);
	206	mutex_init(&dev->io_mutex);
	207	spin_lock_init(&dev->lock);
	208	init_waitqueue_head(&dev->waitq);
	209
	210	dev->udev = usb_get_dev(interface_to_usbdev(interface));
	211	dev->interface = interface;
	212
	213	/* set up the endpoint information */
	214	iface_desc = interface->cur_altsetting;
	215	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
	216	endpoint = &iface_desc->endpoint[i].desc;
	217
	218	if (usb_endpoint_is_int_in(endpoint)) {
	219	dev->int_in_endpointAddr = endpoint->bEndpointAddress;
	220	break;
	221	}
	222	}
	223	if (!dev->int_in_endpointAddr) {
	224	retval = -ENODEV;
45714104	225	dev_err(&interface->dev, "Could not find endpoints\n");
6bc235a2 TS	226	goto error;
	227	}
	228
	229
	230	/* allocate control URB */
	231	dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
0450ba40	232	if (!dev->cntl_urb)
6bc235a2	233	goto error;
6bc235a2 TS	234
6bc235a2 TS	235	/* allocate buffer for control req */
523fc5c1	236	dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL);
0c2bc5c2	237	if (!dev->cntl_req)
6bc235a2	238	goto error;
6bc235a2 TS	239
	240	/* allocate buffer for control msg */
	241	dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
	242	GFP_KERNEL,
	243	&dev->cntl_urb->transfer_dma);
	244	if (!dev->cntl_buffer) {
45714104	245	dev_err(&interface->dev, "Could not allocate cntl_buffer\n");
6bc235a2 TS	246	goto error;
	247	}
	248
	249	/* configure control URB */
	250	dev->cntl_req->bRequestType = USB_DIR_OUT \| USB_TYPE_CLASS \|
	251	USB_RECIP_INTERFACE;
	252	dev->cntl_req->bRequest = HID_REQ_SET_REPORT;
	253	dev->cntl_req->wValue = cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8);
	254	dev->cntl_req->wIndex = cpu_to_le16(iface_desc->desc.bInterfaceNumber);
	255	dev->cntl_req->wLength = cpu_to_le16(YUREX_BUF_SIZE);
	256
	257	usb_fill_control_urb(dev->cntl_urb, dev->udev,
	258	usb_sndctrlpipe(dev->udev, 0),
	259	(void *)dev->cntl_req, dev->cntl_buffer,
	260	YUREX_BUF_SIZE, yurex_control_callback, dev);
e06ea97f	261	dev->cntl_urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
6bc235a2 TS	262
	263
	264	/* allocate interrupt URB */
	265	dev->urb = usb_alloc_urb(0, GFP_KERNEL);
0450ba40	266	if (!dev->urb)
6bc235a2	267	goto error;
6bc235a2 TS	268
	269	/* allocate buffer for interrupt in */
	270	dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
	271	GFP_KERNEL, &dev->urb->transfer_dma);
	272	if (!dev->int_buffer) {
45714104	273	dev_err(&interface->dev, "Could not allocate int_buffer\n");
6bc235a2 TS	274	goto error;
	275	}
	276
	277	/* configure interrupt URB */
	278	usb_fill_int_urb(dev->urb, dev->udev,
	279	usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr),
	280	dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt,
	281	dev, 1);
532f17b5	282	dev->urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
6bc235a2 TS	283	if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
6bc235a2 TS	284	retval = -EIO;
45714104	285	dev_err(&interface->dev, "Could not submitting URB\n");
6bc235a2 TS	286	goto error;
	287	}
	288
	289	/* save our data pointer in this interface device */
	290	usb_set_intfdata(interface, dev);
c78d1ecf	291	dev->bbu = -1;
6bc235a2 TS	292
	293	/* we can register the device now, as it is ready */
	294	retval = usb_register_dev(interface, &yurex_class);
	295	if (retval) {
45714104 GKH	296	dev_err(&interface->dev,
45714104 GKH	297	"Not able to get a minor for this device.\n");
6bc235a2 TS	298	usb_set_intfdata(interface, NULL);
	299	goto error;
	300	}
	301
6bc235a2	302	dev_info(&interface->dev,
e06ea97f	303	"USB YUREX device now attached to Yurex #%d\n",
6bc235a2 TS	304	interface->minor);
	305
	306	return 0;
	307
	308	error:
	309	if (dev)
	310	/* this frees allocated memory */
	311	kref_put(&dev->kref, yurex_delete);
	312	return retval;
	313	}
	314
	315	static void yurex_disconnect(struct usb_interface *interface)
	316	{
	317	struct usb_yurex *dev;
	318	int minor = interface->minor;
	319
	320	dev = usb_get_intfdata(interface);
	321	usb_set_intfdata(interface, NULL);
	322
	323	/* give back our minor */
	324	usb_deregister_dev(interface, &yurex_class);
	325
	326	/* prevent more I/O from starting */
	327	mutex_lock(&dev->io_mutex);
	328	dev->interface = NULL;
	329	mutex_unlock(&dev->io_mutex);
	330
	331	/* wakeup waiters */
	332	kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
	333	wake_up_interruptible(&dev->waitq);
	334
	335	/* decrement our usage count */
	336	kref_put(&dev->kref, yurex_delete);
	337
e06ea97f	338	dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor);
6bc235a2 TS	339	}
	340
	341	static struct usb_driver yurex_driver = {
	342	.name = "yurex",
	343	.probe = yurex_probe,
	344	.disconnect = yurex_disconnect,
	345	.id_table = yurex_table,
	346	};
	347
	348
	349	static int yurex_fasync(int fd, struct file *file, int on)
	350	{
	351	struct usb_yurex *dev;
	352
113ad911	353	dev = file->private_data;
6bc235a2 TS	354	return fasync_helper(fd, file, on, &dev->async_queue);
	355	}
	356
	357	static int yurex_open(struct inode inode, struct file file)
	358	{
	359	struct usb_yurex *dev;
	360	struct usb_interface *interface;
	361	int subminor;
	362	int retval = 0;
	363
	364	subminor = iminor(inode);
	365
	366	interface = usb_find_interface(&yurex_driver, subminor);
	367	if (!interface) {
45714104 GKH	368	printk(KERN_ERR "%s - error, can't find device for minor %d",
45714104 GKH	369	__func__, subminor);
6bc235a2 TS	370	retval = -ENODEV;
	371	goto exit;
	372	}
	373
	374	dev = usb_get_intfdata(interface);
	375	if (!dev) {
	376	retval = -ENODEV;
	377	goto exit;
	378	}
	379
	380	/* increment our usage count for the device */
	381	kref_get(&dev->kref);
	382
	383	/* save our object in the file's private structure */
	384	mutex_lock(&dev->io_mutex);
	385	file->private_data = dev;
	386	mutex_unlock(&dev->io_mutex);
	387
	388	exit:
	389	return retval;
	390	}
	391
	392	static int yurex_release(struct inode inode, struct file file)
	393	{
	394	struct usb_yurex *dev;
	395
113ad911	396	dev = file->private_data;
6bc235a2 TS	397	if (dev == NULL)
	398	return -ENODEV;
	399
6bc235a2 TS	400	/* decrement the count on our device */
	401	kref_put(&dev->kref, yurex_delete);
	402	return 0;
	403	}
	404
1cc373c6 SM	405	static ssize_t yurex_read(struct file file, char __user buffer, size_t count,
1cc373c6 SM	406	loff_t *ppos)
6bc235a2 TS	407	{
	408	struct usb_yurex *dev;
	409	int retval = 0;
	410	int bytes_read = 0;
	411	char in_buffer[20];
	412	unsigned long flags;
	413
113ad911	414	dev = file->private_data;
6bc235a2 TS	415
	416	mutex_lock(&dev->io_mutex);
	417	if (!dev->interface) { /* already disconnected */
	418	retval = -ENODEV;
	419	goto exit;
	420	}
	421
	422	spin_lock_irqsave(&dev->lock, flags);
e06ea97f	423	bytes_read = snprintf(in_buffer, 20, "%lld\n", dev->bbu);
6bc235a2 TS	424	spin_unlock_irqrestore(&dev->lock, flags);
	425
	426	if (*ppos < bytes_read) {
	427	if (copy_to_user(buffer, in_buffer + ppos, bytes_read - ppos))
	428	retval = -EFAULT;
	429	else {
	430	retval = bytes_read - *ppos;
	431	*ppos += bytes_read;
	432	}
	433	}
	434
	435	exit:
	436	mutex_unlock(&dev->io_mutex);
	437	return retval;
	438	}
	439
1cc373c6 SM	440	static ssize_t yurex_write(struct file file, const char __user user_buffer,
1cc373c6 SM	441	size_t count, loff_t *ppos)
6bc235a2 TS	442	{
	443	struct usb_yurex *dev;
	444	int i, set = 0, retval = 0;
	445	char buffer[16];
	446	char *data = buffer;
	447	unsigned long long c, c2 = 0;
	448	signed long timeout = 0;
	449	DEFINE_WAIT(wait);
	450
	451	count = min(sizeof(buffer), count);
113ad911	452	dev = file->private_data;
6bc235a2 TS	453
	454	/* verify that we actually have some data to write */
	455	if (count == 0)
	456	goto error;
	457
	458	mutex_lock(&dev->io_mutex);
3fb4c07a	459	if (!dev->interface) { /* already disconnected */
6bc235a2 TS	460	mutex_unlock(&dev->io_mutex);
	461	retval = -ENODEV;
	462	goto error;
	463	}
	464
	465	if (copy_from_user(buffer, user_buffer, count)) {
	466	mutex_unlock(&dev->io_mutex);
	467	retval = -EFAULT;
	468	goto error;
	469	}
	470	memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE);
	471
	472	switch (buffer[0]) {
	473	case CMD_ANIMATE:
	474	case CMD_LED:
	475	dev->cntl_buffer[0] = buffer[0];
	476	dev->cntl_buffer[1] = buffer[1];
	477	dev->cntl_buffer[2] = CMD_EOF;
	478	break;
	479	case CMD_READ:
	480	case CMD_VERSION:
	481	dev->cntl_buffer[0] = buffer[0];
	482	dev->cntl_buffer[1] = 0x00;
	483	dev->cntl_buffer[2] = CMD_EOF;
	484	break;
	485	case CMD_SET:
	486	data++;
	487	/* FALL THROUGH */
	488	case '0' ... '9':
	489	set = 1;
	490	c = c2 = simple_strtoull(data, NULL, 0);
	491	dev->cntl_buffer[0] = CMD_SET;
	492	for (i = 1; i < 6; i++) {
	493	dev->cntl_buffer[i] = (c>>32) & 0xff;
	494	c <<= 8;
	495	}
	496	buffer[6] = CMD_EOF;
	497	break;
	498	default:
	499	mutex_unlock(&dev->io_mutex);
	500	return -EINVAL;
	501	}
	502
	503	/* send the data as the control msg */
	504	prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE);
aadd6472 GKH	505	dev_dbg(&dev->interface->dev, "%s - submit %c\n", __func__,
aadd6472 GKH	506	dev->cntl_buffer[0]);
6bc235a2 TS	507	retval = usb_submit_urb(dev->cntl_urb, GFP_KERNEL);
	508	if (retval >= 0)
	509	timeout = schedule_timeout(YUREX_WRITE_TIMEOUT);
	510	finish_wait(&dev->waitq, &wait);
	511
	512	mutex_unlock(&dev->io_mutex);
	513
	514	if (retval < 0) {
45714104 GKH	515	dev_err(&dev->interface->dev,
	516	"%s - failed to send bulk msg, error %d\n",
	517	__func__, retval);
6bc235a2 TS	518	goto error;
	519	}
	520	if (set && timeout)
	521	dev->bbu = c2;
	522	return timeout ? count : -EIO;
	523
	524	error:
	525	return retval;
	526	}
	527
	528	static const struct file_operations yurex_fops = {
	529	.owner = THIS_MODULE,
	530	.read = yurex_read,
	531	.write = yurex_write,
	532	.open = yurex_open,
	533	.release = yurex_release,
	534	.fasync = yurex_fasync,
27f485b5	535	.llseek = default_llseek,
6bc235a2 TS	536	};
6bc235a2 TS	537
65db4305	538	module_usb_driver(yurex_driver);
6bc235a2 TS	539
6bc235a2 TS	540	MODULE_LICENSE("GPL");