/* * 	USB FS2410usbcon driver - 1.0 * *	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. * *	 This driver is based on the the USB Skeleton driver in the 2.6.24.7 version of linux kenerel. * */#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 <asm/uaccess.h>#include <linux/usb.h>#include <linux/mutex.h>/* ioctl commands */#define IOCTL_SET_USER_INPUT	(0x79)#define IOCTL_GET_ARM_OUTPUT	(0x80)/* USB request commands in pipe0 on arm */#define PIPO0_SET_USER_INPUT	(79)#define PIPO0_GET_ARM_OUTPUT_LENGTH	(80)#define PIPO0_GET_ARM_OUTPUT	(81)/* Define these values to match your devices */#define USB_FS2410USBCON_VENDOR_ID	0x5345#define USB_FS2410USBCON_PRODUCT_ID	0x1234/* table of devices that work with this driver */static struct usb_device_id fs2410usbcon_table[] = {	{ USB_DEVICE(USB_FS2410USBCON_VENDOR_ID, USB_FS2410USBCON_PRODUCT_ID) },	{ }					/* Terminating entry */};MODULE_DEVICE_TABLE(usb, fs2410usbcon_table);/* Get a minor range for your devices from the usb maintainer */#define USB_FS2410USBCON_MINOR_BASE	192/* our private defines. if this grows any larger, use your own .h file */#define MAX_TRANSFER		(PAGE_SIZE - 512)/* MAX_TRANSFER is chosen so that the VM is not stressed by   allocations > PAGE_SIZE and the number of packets in a page   is an integer 512 is the largest possible packet on EHCI */#define WRITES_IN_FLIGHT	8/* arbitrarily chosen *//* Structure to hold all of our device specific stuff */struct usb_fs2410usbcon {	struct usb_device	*udev;			/* the usb device for this device */	struct usb_interface	*interface;		/* the interface for this device */	struct semaphore	limit_sem;		/* limiting the number of writes in progress */	struct usb_anchor	submitted;		/* in case we need to retract our submissions */	unsigned char           *bulk_in_buffer;	/* the buffer to receive data */	size_t			bulk_in_size;		/* the size of the receive buffer */	__u8			bulk_in_endpointAddr;	/* the address of the bulk in endpoint */	__u8			bulk_out_endpointAddr;	/* the address of the bulk out endpoint */	int			errors;			/* the last request tanked */	int			open_count;		/* count the number of openers */	spinlock_t		err_lock;		/* lock for errors */	struct kref		kref;	struct mutex		io_mutex;		/* synchronize I/O with disconnect */};#define to_fs2410usbcon_dev(d) container_of(d, struct usb_fs2410usbcon, kref)static struct usb_driver fs2410usbcon_driver;static void fs2410usbcon_draw_down(struct usb_fs2410usbcon *dev);static void fs2410usbcon_delete(struct kref *kref){	struct usb_fs2410usbcon *dev = to_fs2410usbcon_dev(kref);	usb_put_dev(dev->udev);	kfree(dev->bulk_in_buffer);	kfree(dev);}static int fs2410usbcon_open(struct inode *inode, struct file *file){	struct usb_fs2410usbcon *dev;	struct usb_interface *interface;	int subminor;	int retval = 0;	subminor = iminor(inode);	interface = usb_find_interface(&fs2410usbcon_driver, subminor);	if (!interface) {		err ("%s - error, can't find device for minor %d",		     __FUNCTION__, 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);	/* lock the device to allow correctly handling errors	 * in resumption */	mutex_lock(&dev->io_mutex);	if (!dev->open_count++) {		retval = usb_autopm_get_interface(interface);			if (retval) {				dev->open_count--;				mutex_unlock(&dev->io_mutex);				kref_put(&dev->kref, fs2410usbcon_delete);				goto exit;			}	} /* else { //uncomment this block if you want exclusive open		retval = -EBUSY;		dev->open_count--;		mutex_unlock(&dev->io_mutex);		kref_put(&dev->kref, fs2410usbcon_delete);		goto exit;	} */	/* prevent the device from being autosuspended */	/* save our object in the file's private structure */	file->private_data = dev;	mutex_unlock(&dev->io_mutex);exit:	return retval;}static int fs2410usbcon_release(struct inode *inode, struct file *file){	struct usb_fs2410usbcon *dev;	dev = (struct usb_fs2410usbcon *)file->private_data;	if (dev == NULL)		return -ENODEV;	/* allow the device to be autosuspended */	mutex_lock(&dev->io_mutex);	if (!--dev->open_count && dev->interface)		usb_autopm_put_interface(dev->interface);	mutex_unlock(&dev->io_mutex);	/* decrement the count on our device */	kref_put(&dev->kref, fs2410usbcon_delete);	return 0;}static int fs2410usbcon_flush(struct file *file, fl_owner_t id){	struct usb_fs2410usbcon *dev;	int res;	dev = (struct usb_fs2410usbcon *)file->private_data;	if (dev == NULL)		return -ENODEV;	/* wait for io to stop */	mutex_lock(&dev->io_mutex);	fs2410usbcon_draw_down(dev);	/* read out errors, leave subsequent opens a clean slate */	spin_lock_irq(&dev->err_lock);	res = dev->errors ? (dev->errors == -EPIPE ? -EPIPE : -EIO) : 0;	dev->errors = 0;	spin_unlock_irq(&dev->err_lock);	mutex_unlock(&dev->io_mutex);	return res;}static ssize_t fs2410usbcon_read(struct file *file, char *buffer, size_t count, loff_t *ppos){	struct usb_fs2410usbcon *dev;	int retval;	int bytes_read;	dev = (struct usb_fs2410usbcon *)file->private_data;	mutex_lock(&dev->io_mutex);	if (!dev->interface) {		/* disconnect() was called */		retval = -ENODEV;		goto exit;	}	/* do a blocking bulk read to get data from the device */	retval = usb_bulk_msg(dev->udev,			      usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),			      dev->bulk_in_buffer,			      min(dev->bulk_in_size, count),			      &bytes_read, 10000);	/* if the read was successful, copy the data to userspace */	if (!retval) {		if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))			retval = -EFAULT;		else			retval = bytes_read;	}exit:	mutex_unlock(&dev->io_mutex);	return retval;}#if 1static ssize_t fs2410usbcon_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos){	struct usb_fs2410usbcon *dev;	int retval = 0;	int bytes_write = 0;	char *buf = NULL;	size_t writesize = min(count, (size_t)MAX_TRANSFER);	dev = (struct usb_fs2410usbcon *)file->private_data;	/* verify that we actually have some data to write */	if (count == 0)		return 0;	mutex_lock(&dev->io_mutex);	if (!dev->interface) {		/* disconnect() was called */		retval = -ENODEV;		goto write_exit;	}	/* allocate memory */	buf = kzalloc(writesize, GFP_KERNEL);	if (!buf) 	{		err("Out of memory");		retval = -ENOMEM;		goto write_exit;	}	if (copy_from_user(buf, user_buffer, writesize)) 	{		retval = -EFAULT;		goto write_exit;	}	/* do a blocking bulk write to write data to the device */	retval = usb_bulk_msg(dev->udev,			      usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),			      buf, writesize,			      &bytes_write, 10000);	/* if the write was successful, copy the data to userspace */	if (!retval)	{		retval = bytes_write;	}write_exit:	if (buf)	{		kfree(buf);	}	mutex_unlock(&dev->io_mutex);	return retval;}#elsestatic void fs2410usbcon_write_bulk_callback(struct urb *urb){	struct usb_fs2410usbcon *dev;	dev = (struct usb_fs2410usbcon *)urb->context;	/* sync/async unlink faults aren't errors */	if (urb->status) {		if(!(urb->status == -ENOENT ||		    urb->status == -ECONNRESET ||		    urb->status == -ESHUTDOWN))			err("%s - nonzero write bulk status received: %d",			    __FUNCTION__, urb->status);		spin_lock(&dev->err_lock);		dev->errors = urb->status;		spin_unlock(&dev->err_lock);	}	/* free up our allocated buffer */	usb_buffer_free(urb->dev, urb->transfer_buffer_length,			urb->transfer_buffer, urb->transfer_dma);	up(&dev->limit_sem);}static ssize_t fs2410usbcon_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos){	struct usb_fs2410usbcon *dev;	int retval = 0;	struct urb *urb = NULL;	char *buf = NULL;	size_t writesize = min(count, (size_t)MAX_TRANSFER);	dev = (struct usb_fs2410usbcon *)file->private_data;	/* verify that we actually have some data to write */	if (count == 0)		goto exit;	/* limit the number of URBs in flight to stop a user from using up all RAM */	if (down_interruptible(&dev->limit_sem)) {		retval = -ERESTARTSYS;		goto exit;	}	spin_lock_irq(&dev->err_lock);	if ((retval = dev->errors) < 0) {		/* any error is reported once */		dev->errors = 0;		/* to preserve notifications about reset */		retval = (retval == -EPIPE) ? retval : -EIO;	}	spin_unlock_irq(&dev->err_lock);	if (retval < 0)		goto error;	/* create a urb, and a buffer for it, and copy the data to the urb */	urb = usb_alloc_urb(0, GFP_KERNEL);	if (!urb) {		retval = -ENOMEM;		goto error;	}	buf = usb_buffer_alloc(dev->udev, writesize, GFP_KERNEL, &urb->transfer_dma);	if (!buf) {		retval = -ENOMEM;		goto error;	}	if (copy_from_user(buf, user_buffer, writesize)) {		retval = -EFAULT;		goto error;	}	/* this lock makes sure we don't submit URBs to gone devices */	mutex_lock(&dev->io_mutex);	if (!dev->interface) {		/* disconnect() was called */		mutex_unlock(&dev->io_mutex);		retval = -ENODEV;		goto error;	}	/* initialize the urb properly */	usb_fill_bulk_urb(urb, dev->udev,			  usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),			  buf, writesize,			  fs2410usbcon_write_bulk_callback, dev);	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;	usb_anchor_urb(urb, &dev->submitted);	/* send the data out the bulk port */	retval = usb_submit_urb(urb, GFP_KERNEL);	mutex_unlock(&dev->io_mutex);	if (retval) {		err("%s - failed submitting write urb, error %d", __FUNCTION__, retval);		goto error_unanchor;	}	/* release our reference to this urb, the USB core will eventually free it entirely */	usb_free_urb(urb);	return writesize;error_unanchor:	usb_unanchor_urb(urb);error:	if (urb) {		usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma);		usb_free_urb(urb);	}	up(&dev->limit_sem);exit:	return retval;}#endifstruct IOCTL_DATA_IO{	size_t length;	char *data;};int fs2410usbcon_ioctl(struct inode * inode_, struct file * filp, unsigned int cmd, unsigned long arg){	struct usb_fs2410usbcon *dev = (struct usb_fs2410usbcon *)filp->private_data;	int retval = 0;	char *buf = NULL;	size_t iosize = 0;	unsigned char ucLen[4];	int len; /* how many bytes can be readed out in the device ? */	struct IOCTL_DATA_IO ctlData;	switch (cmd)	{		case IOCTL_SET_USER_INPUT:			{				if (copy_from_user(&ctlData, (const void *)arg, sizeof(struct IOCTL_DATA_IO)))				{					retval = -EFAULT;					return retval;				}				if (ctlData.length > 0)