[mirror_ubuntu-bionic-kernel.git] / drivers / usb / misc / yurex.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for Meywa-Denki & KAYAC YUREX
 *
 * Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com)
 */

#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;
	DEFINE_WAIT(wait);
	int res;

	/* 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;
	res = usb_find_int_in_endpoint(iface_desc, &endpoint);
	if (res) {
		dev_err(&interface->dev, "Could not find endpoints\n");
		retval = res;
		goto error;
	}

	dev->int_in_endpointAddr = endpoint->bEndpointAddress;

	/* 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
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0
6bc235a2 TS	2	/*
	3	* Driver for Meywa-Denki & KAYAC YUREX
	4	*
	5	* Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com)
6bc235a2 TS	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/errno.h>
6bc235a2 TS	10	#include <linux/slab.h>
	11	#include <linux/module.h>
	12	#include <linux/kref.h>
	13	#include <linux/mutex.h>
	14	#include <linux/uaccess.h>
	15	#include <linux/usb.h>
	16	#include <linux/hid.h>
	17
	18	#define DRIVER_AUTHOR "Tomoki Sekiyama"
	19	#define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX"
	20
	21	#define YUREX_VENDOR_ID 0x0c45
	22	#define YUREX_PRODUCT_ID 0x1010
	23
	24	#define CMD_ACK '!'
	25	#define CMD_ANIMATE 'A'
	26	#define CMD_COUNT 'C'
	27	#define CMD_LED 'L'
	28	#define CMD_READ 'R'
	29	#define CMD_SET 'S'
	30	#define CMD_VERSION 'V'
	31	#define CMD_EOF 0x0d
	32	#define CMD_PADDING 0xff
	33
	34	#define YUREX_BUF_SIZE 8
e06ea97f	35	#define YUREX_WRITE_TIMEOUT (HZ*2)
6bc235a2 TS	36
	37	/* table of devices that work with this driver */
	38	static struct usb_device_id yurex_table[] = {
	39	{ USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) },
	40	{ } /* Terminating entry */
	41	};
	42	MODULE_DEVICE_TABLE(usb, yurex_table);
	43
	44	#ifdef CONFIG_USB_DYNAMIC_MINORS
1b62d258	45	#define YUREX_MINOR_BASE 0
6bc235a2	46	#else
1b62d258	47	#define YUREX_MINOR_BASE 192
6bc235a2 TS	48	#endif
	49
	50	/* Structure to hold all of our device specific stuff */
	51	struct usb_yurex {
	52	struct usb_device *udev;
	53	struct usb_interface *interface;
	54	__u8 int_in_endpointAddr;
	55	struct urb urb; / URB for interrupt in */
	56	unsigned char int_buffer; / buffer for intterupt in */
	57	struct urb cntl_urb; / URB for control msg */
	58	struct usb_ctrlrequest cntl_req; / req for control msg */
	59	unsigned char cntl_buffer; / buffer for control msg */
	60
	61	struct kref kref;
	62	struct mutex io_mutex;
	63	struct fasync_struct *async_queue;
	64	wait_queue_head_t waitq;
	65
	66	spinlock_t lock;
	67	__s64 bbu; /* BBU from device */
	68	};
	69	#define to_yurex_dev(d) container_of(d, struct usb_yurex, kref)
	70
	71	static struct usb_driver yurex_driver;
	72	static const struct file_operations yurex_fops;
	73
	74
	75	static void yurex_control_callback(struct urb *urb)
	76	{
	77	struct usb_yurex *dev = urb->context;
	78	int status = urb->status;
	79
	80	if (status) {
45714104 GKH	81	dev_err(&urb->dev->dev, "%s - control failed: %d\n",
45714104 GKH	82	__func__, status);
6bc235a2 TS	83	wake_up_interruptible(&dev->waitq);
	84	return;
	85	}
	86	/* on success, sender woken up by CMD_ACK int in, or timeout */
	87	}
	88
	89	static void yurex_delete(struct kref *kref)
	90	{
	91	struct usb_yurex *dev = to_yurex_dev(kref);
	92
aadd6472	93	dev_dbg(&dev->interface->dev, "%s\n", __func__);
6bc235a2 TS	94
6bc235a2 TS	95	usb_put_dev(dev->udev);
e06ea97f TS	96	if (dev->cntl_urb) {
e06ea97f TS	97	usb_kill_urb(dev->cntl_urb);
523fc5c1	98	kfree(dev->cntl_req);
e06ea97f TS	99	if (dev->cntl_buffer)
	100	usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
	101	dev->cntl_buffer, dev->cntl_urb->transfer_dma);
	102	usb_free_urb(dev->cntl_urb);
	103	}
6bc235a2 TS	104	if (dev->urb) {
	105	usb_kill_urb(dev->urb);
	106	if (dev->int_buffer)
	107	usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
	108	dev->int_buffer, dev->urb->transfer_dma);
	109	usb_free_urb(dev->urb);
	110	}
	111	kfree(dev);
	112	}
	113
	114	/*
	115	* usb class driver info in order to get a minor number from the usb core,
	116	* and to have the device registered with the driver core
	117	*/
	118	static struct usb_class_driver yurex_class = {
	119	.name = "yurex%d",
	120	.fops = &yurex_fops,
	121	.minor_base = YUREX_MINOR_BASE,
	122	};
	123
	124	static void yurex_interrupt(struct urb *urb)
	125	{
	126	struct usb_yurex *dev = urb->context;
	127	unsigned char *buf = dev->int_buffer;
	128	int status = urb->status;
	129	unsigned long flags;
	130	int retval, i;
	131
	132	switch (status) {
	133	case 0: /success/
	134	break;
	135	case -EOVERFLOW:
45714104 GKH	136	dev_err(&dev->interface->dev,
	137	"%s - overflow with length %d, actual length is %d\n",
	138	__func__, YUREX_BUF_SIZE, dev->urb->actual_length);
6bc235a2 TS	139	case -ECONNRESET:
	140	case -ENOENT:
	141	case -ESHUTDOWN:
	142	case -EILSEQ:
	143	/* The device is terminated, clean up */
	144	return;
	145	default:
45714104 GKH	146	dev_err(&dev->interface->dev,
45714104 GKH	147	"%s - unknown status received: %d\n", __func__, status);
6bc235a2 TS	148	goto exit;
	149	}
	150
	151	/* handle received message */
	152	switch (buf[0]) {
	153	case CMD_COUNT:
	154	case CMD_READ:
	155	if (buf[6] == CMD_EOF) {
	156	spin_lock_irqsave(&dev->lock, flags);
	157	dev->bbu = 0;
	158	for (i = 1; i < 6; i++) {
	159	dev->bbu += buf[i];
	160	if (i != 5)
	161	dev->bbu <<= 8;
	162	}
aadd6472 GKH	163	dev_dbg(&dev->interface->dev, "%s count: %lld\n",
aadd6472 GKH	164	__func__, dev->bbu);
6bc235a2 TS	165	spin_unlock_irqrestore(&dev->lock, flags);
	166
	167	kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
	168	}
	169	else
aadd6472 GKH	170	dev_dbg(&dev->interface->dev,
aadd6472 GKH	171	"data format error - no EOF\n");
6bc235a2 TS	172	break;
6bc235a2 TS	173	case CMD_ACK:
aadd6472 GKH	174	dev_dbg(&dev->interface->dev, "%s ack: %c\n",
aadd6472 GKH	175	__func__, buf[1]);
6bc235a2 TS	176	wake_up_interruptible(&dev->waitq);
	177	break;
	178	}
	179
	180	exit:
	181	retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
	182	if (retval) {
45714104	183	dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n",
6bc235a2 TS	184	__func__, retval);
	185	}
	186	}
	187
	188	static int yurex_probe(struct usb_interface interface, const struct usb_device_id id)
	189	{
	190	struct usb_yurex *dev;
	191	struct usb_host_interface *iface_desc;
	192	struct usb_endpoint_descriptor *endpoint;
	193	int retval = -ENOMEM;
6bc235a2	194	DEFINE_WAIT(wait);
499841e6	195	int res;
6bc235a2 TS	196
	197	/* allocate memory for our device state and initialize it */
	198	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
0c2bc5c2	199	if (!dev)
6bc235a2	200	goto error;
6bc235a2 TS	201	kref_init(&dev->kref);
	202	mutex_init(&dev->io_mutex);
	203	spin_lock_init(&dev->lock);
	204	init_waitqueue_head(&dev->waitq);
	205
	206	dev->udev = usb_get_dev(interface_to_usbdev(interface));
	207	dev->interface = interface;
	208
	209	/* set up the endpoint information */
	210	iface_desc = interface->cur_altsetting;
499841e6 JH	211	res = usb_find_int_in_endpoint(iface_desc, &endpoint);
499841e6 JH	212	if (res) {
45714104	213	dev_err(&interface->dev, "Could not find endpoints\n");
499841e6	214	retval = res;
6bc235a2 TS	215	goto error;
	216	}
	217
499841e6	218	dev->int_in_endpointAddr = endpoint->bEndpointAddress;
6bc235a2 TS	219
	220	/* allocate control URB */
	221	dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
0450ba40	222	if (!dev->cntl_urb)
6bc235a2	223	goto error;
6bc235a2 TS	224
6bc235a2 TS	225	/* allocate buffer for control req */
523fc5c1	226	dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL);
0c2bc5c2	227	if (!dev->cntl_req)
6bc235a2	228	goto error;
6bc235a2 TS	229
	230	/* allocate buffer for control msg */
	231	dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
	232	GFP_KERNEL,
	233	&dev->cntl_urb->transfer_dma);
	234	if (!dev->cntl_buffer) {
45714104	235	dev_err(&interface->dev, "Could not allocate cntl_buffer\n");
6bc235a2 TS	236	goto error;
	237	}
	238
	239	/* configure control URB */
	240	dev->cntl_req->bRequestType = USB_DIR_OUT \| USB_TYPE_CLASS \|
	241	USB_RECIP_INTERFACE;
	242	dev->cntl_req->bRequest = HID_REQ_SET_REPORT;
	243	dev->cntl_req->wValue = cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8);
	244	dev->cntl_req->wIndex = cpu_to_le16(iface_desc->desc.bInterfaceNumber);
	245	dev->cntl_req->wLength = cpu_to_le16(YUREX_BUF_SIZE);
	246
	247	usb_fill_control_urb(dev->cntl_urb, dev->udev,
	248	usb_sndctrlpipe(dev->udev, 0),
	249	(void *)dev->cntl_req, dev->cntl_buffer,
	250	YUREX_BUF_SIZE, yurex_control_callback, dev);
e06ea97f	251	dev->cntl_urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
6bc235a2 TS	252
	253
	254	/* allocate interrupt URB */
	255	dev->urb = usb_alloc_urb(0, GFP_KERNEL);
0450ba40	256	if (!dev->urb)
6bc235a2	257	goto error;
6bc235a2 TS	258
	259	/* allocate buffer for interrupt in */
	260	dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
	261	GFP_KERNEL, &dev->urb->transfer_dma);
	262	if (!dev->int_buffer) {
45714104	263	dev_err(&interface->dev, "Could not allocate int_buffer\n");
6bc235a2 TS	264	goto error;
	265	}
	266
	267	/* configure interrupt URB */
	268	usb_fill_int_urb(dev->urb, dev->udev,
	269	usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr),
	270	dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt,
	271	dev, 1);
532f17b5	272	dev->urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
6bc235a2 TS	273	if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
6bc235a2 TS	274	retval = -EIO;
45714104	275	dev_err(&interface->dev, "Could not submitting URB\n");
6bc235a2 TS	276	goto error;
	277	}
	278
	279	/* save our data pointer in this interface device */
	280	usb_set_intfdata(interface, dev);
c78d1ecf	281	dev->bbu = -1;
6bc235a2 TS	282
	283	/* we can register the device now, as it is ready */
	284	retval = usb_register_dev(interface, &yurex_class);
	285	if (retval) {
45714104 GKH	286	dev_err(&interface->dev,
45714104 GKH	287	"Not able to get a minor for this device.\n");
6bc235a2 TS	288	usb_set_intfdata(interface, NULL);
	289	goto error;
	290	}
	291
6bc235a2	292	dev_info(&interface->dev,
e06ea97f	293	"USB YUREX device now attached to Yurex #%d\n",
6bc235a2 TS	294	interface->minor);
	295
	296	return 0;
	297
	298	error:
	299	if (dev)
	300	/* this frees allocated memory */
	301	kref_put(&dev->kref, yurex_delete);
	302	return retval;
	303	}
	304
	305	static void yurex_disconnect(struct usb_interface *interface)
	306	{
	307	struct usb_yurex *dev;
	308	int minor = interface->minor;
	309
	310	dev = usb_get_intfdata(interface);
	311	usb_set_intfdata(interface, NULL);
	312
	313	/* give back our minor */
	314	usb_deregister_dev(interface, &yurex_class);
	315
	316	/* prevent more I/O from starting */
	317	mutex_lock(&dev->io_mutex);
	318	dev->interface = NULL;
	319	mutex_unlock(&dev->io_mutex);
	320
	321	/* wakeup waiters */
	322	kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
	323	wake_up_interruptible(&dev->waitq);
	324
	325	/* decrement our usage count */
	326	kref_put(&dev->kref, yurex_delete);
	327
e06ea97f	328	dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor);
6bc235a2 TS	329	}
	330
	331	static struct usb_driver yurex_driver = {
	332	.name = "yurex",
	333	.probe = yurex_probe,
	334	.disconnect = yurex_disconnect,
	335	.id_table = yurex_table,
	336	};
	337
	338
	339	static int yurex_fasync(int fd, struct file *file, int on)
	340	{
	341	struct usb_yurex *dev;
	342
113ad911	343	dev = file->private_data;
6bc235a2 TS	344	return fasync_helper(fd, file, on, &dev->async_queue);
	345	}
	346
	347	static int yurex_open(struct inode inode, struct file file)
	348	{
	349	struct usb_yurex *dev;
	350	struct usb_interface *interface;
	351	int subminor;
	352	int retval = 0;
	353
	354	subminor = iminor(inode);
	355
	356	interface = usb_find_interface(&yurex_driver, subminor);
	357	if (!interface) {
45714104 GKH	358	printk(KERN_ERR "%s - error, can't find device for minor %d",
45714104 GKH	359	__func__, subminor);
6bc235a2 TS	360	retval = -ENODEV;
	361	goto exit;
	362	}
	363
	364	dev = usb_get_intfdata(interface);
	365	if (!dev) {
	366	retval = -ENODEV;
	367	goto exit;
	368	}
	369
	370	/* increment our usage count for the device */
	371	kref_get(&dev->kref);
	372
	373	/* save our object in the file's private structure */
	374	mutex_lock(&dev->io_mutex);
	375	file->private_data = dev;
	376	mutex_unlock(&dev->io_mutex);
	377
	378	exit:
	379	return retval;
	380	}
	381
	382	static int yurex_release(struct inode inode, struct file file)
	383	{
	384	struct usb_yurex *dev;
	385
113ad911	386	dev = file->private_data;
6bc235a2 TS	387	if (dev == NULL)
	388	return -ENODEV;
	389
6bc235a2 TS	390	/* decrement the count on our device */
	391	kref_put(&dev->kref, yurex_delete);
	392	return 0;
	393	}
	394
1cc373c6 SM	395	static ssize_t yurex_read(struct file file, char __user buffer, size_t count,
1cc373c6 SM	396	loff_t *ppos)
6bc235a2 TS	397	{
	398	struct usb_yurex *dev;
	399	int retval = 0;
	400	int bytes_read = 0;
	401	char in_buffer[20];
	402	unsigned long flags;
	403
113ad911	404	dev = file->private_data;
6bc235a2 TS	405
	406	mutex_lock(&dev->io_mutex);
	407	if (!dev->interface) { /* already disconnected */
	408	retval = -ENODEV;
	409	goto exit;
	410	}
	411
	412	spin_lock_irqsave(&dev->lock, flags);
e06ea97f	413	bytes_read = snprintf(in_buffer, 20, "%lld\n", dev->bbu);
6bc235a2 TS	414	spin_unlock_irqrestore(&dev->lock, flags);
	415
	416	if (*ppos < bytes_read) {
	417	if (copy_to_user(buffer, in_buffer + ppos, bytes_read - ppos))
	418	retval = -EFAULT;
	419	else {
	420	retval = bytes_read - *ppos;
	421	*ppos += bytes_read;
	422	}
	423	}
	424
	425	exit:
	426	mutex_unlock(&dev->io_mutex);
	427	return retval;
	428	}
	429
1cc373c6 SM	430	static ssize_t yurex_write(struct file file, const char __user user_buffer,
1cc373c6 SM	431	size_t count, loff_t *ppos)
6bc235a2 TS	432	{
	433	struct usb_yurex *dev;
	434	int i, set = 0, retval = 0;
	435	char buffer[16];
	436	char *data = buffer;
	437	unsigned long long c, c2 = 0;
	438	signed long timeout = 0;
	439	DEFINE_WAIT(wait);
	440
	441	count = min(sizeof(buffer), count);
113ad911	442	dev = file->private_data;
6bc235a2 TS	443
	444	/* verify that we actually have some data to write */
	445	if (count == 0)
	446	goto error;
	447
	448	mutex_lock(&dev->io_mutex);
3fb4c07a	449	if (!dev->interface) { /* already disconnected */
6bc235a2 TS	450	mutex_unlock(&dev->io_mutex);
	451	retval = -ENODEV;
	452	goto error;
	453	}
	454
	455	if (copy_from_user(buffer, user_buffer, count)) {
	456	mutex_unlock(&dev->io_mutex);
	457	retval = -EFAULT;
	458	goto error;
	459	}
	460	memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE);
	461
	462	switch (buffer[0]) {
	463	case CMD_ANIMATE:
	464	case CMD_LED:
	465	dev->cntl_buffer[0] = buffer[0];
	466	dev->cntl_buffer[1] = buffer[1];
	467	dev->cntl_buffer[2] = CMD_EOF;
	468	break;
	469	case CMD_READ:
	470	case CMD_VERSION:
	471	dev->cntl_buffer[0] = buffer[0];
	472	dev->cntl_buffer[1] = 0x00;
	473	dev->cntl_buffer[2] = CMD_EOF;
	474	break;
	475	case CMD_SET:
	476	data++;
	477	/* FALL THROUGH */
	478	case '0' ... '9':
	479	set = 1;
	480	c = c2 = simple_strtoull(data, NULL, 0);
	481	dev->cntl_buffer[0] = CMD_SET;
	482	for (i = 1; i < 6; i++) {
	483	dev->cntl_buffer[i] = (c>>32) & 0xff;
	484	c <<= 8;
	485	}
	486	buffer[6] = CMD_EOF;
	487	break;
	488	default:
	489	mutex_unlock(&dev->io_mutex);
	490	return -EINVAL;
	491	}
	492
	493	/* send the data as the control msg */
	494	prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE);
aadd6472 GKH	495	dev_dbg(&dev->interface->dev, "%s - submit %c\n", __func__,
aadd6472 GKH	496	dev->cntl_buffer[0]);
6bc235a2 TS	497	retval = usb_submit_urb(dev->cntl_urb, GFP_KERNEL);
	498	if (retval >= 0)
	499	timeout = schedule_timeout(YUREX_WRITE_TIMEOUT);
	500	finish_wait(&dev->waitq, &wait);
	501
	502	mutex_unlock(&dev->io_mutex);
	503
	504	if (retval < 0) {
45714104 GKH	505	dev_err(&dev->interface->dev,
	506	"%s - failed to send bulk msg, error %d\n",
	507	__func__, retval);
6bc235a2 TS	508	goto error;
	509	}
	510	if (set && timeout)
	511	dev->bbu = c2;
	512	return timeout ? count : -EIO;
	513
	514	error:
	515	return retval;
	516	}
	517
	518	static const struct file_operations yurex_fops = {
	519	.owner = THIS_MODULE,
	520	.read = yurex_read,
	521	.write = yurex_write,
	522	.open = yurex_open,
	523	.release = yurex_release,
	524	.fasync = yurex_fasync,
27f485b5	525	.llseek = default_llseek,
6bc235a2 TS	526	};
6bc235a2 TS	527
65db4305	528	module_usb_driver(yurex_driver);
6bc235a2 TS	529
6bc235a2 TS	530	MODULE_LICENSE("GPL");