drivers/sbus/char/vfc_dev.c - maze/linux - Git at Google

 /*
  * drivers/sbus/char/vfc_dev.c
  *
  * Driver for the Videopix Frame Grabber.
  *
  * In order to use the VFC you need to program the video controller
  * chip. This chip is the Phillips SAA9051.  You need to call their
  * documentation ordering line to get the docs.
  *
  * There is very little documentation on the VFC itself.  There is
  * some useful info that can be found in the manuals that come with
  * the card.  I will hopefully write some better docs at a later date.
  *
  * Copyright (C) 1996 Manish Vachharajani (mvachhar@noc.rutgers.edu)
  * */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/smp_lock.h>
 #include <linux/delay.h>
 #include <linux/spinlock.h>
 #include <linux/mm.h>

 #include <asm/openprom.h>
 #include <asm/oplib.h>
 #include <asm/io.h>
 #include <asm/system.h>
 #include <asm/sbus.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include <asm/uaccess.h>

 #define VFC_MAJOR (60)

 #if 0
 #define VFC_IOCTL_DEBUG
 #endif

 #include "vfc.h"
 #include <asm/vfc_ioctls.h>

 static const struct file_operations vfc_fops;
 struct vfc_dev **vfc_dev_lst;
 static char vfcstr[]="vfc";
 static unsigned char saa9051_init_array[VFC_SAA9051_NR] = {
 	0x00, 0x64, 0x72, 0x52,
 	0x36, 0x18, 0xff, 0x20,
 	0xfc, 0x77, 0xe3, 0x50,
 	0x3e
 };

 void vfc_lock_device(struct vfc_dev *dev)
 {
 	down(&dev->device_lock_sem);
 }

 void vfc_unlock_device(struct vfc_dev *dev)
 {
 	up(&dev->device_lock_sem);
 }


 void vfc_captstat_reset(struct vfc_dev *dev)
 {
 	dev->control_reg |= VFC_CONTROL_CAPTRESET;
 	sbus_writel(dev->control_reg, &dev->regs->control);
 	dev->control_reg &= ~VFC_CONTROL_CAPTRESET;
 	sbus_writel(dev->control_reg, &dev->regs->control);
 	dev->control_reg |= VFC_CONTROL_CAPTRESET;
 	sbus_writel(dev->control_reg, &dev->regs->control);
 }

 void vfc_memptr_reset(struct vfc_dev *dev)
 {
 	dev->control_reg |= VFC_CONTROL_MEMPTR;
 	sbus_writel(dev->control_reg, &dev->regs->control);
 	dev->control_reg &= ~VFC_CONTROL_MEMPTR;
 	sbus_writel(dev->control_reg, &dev->regs->control);
 	dev->control_reg |= VFC_CONTROL_MEMPTR;
 	sbus_writel(dev->control_reg, &dev->regs->control);
 }

 int vfc_csr_init(struct vfc_dev *dev)
 {
 	dev->control_reg = 0x80000000;
 	sbus_writel(dev->control_reg, &dev->regs->control);
 	udelay(200);
 	dev->control_reg &= ~0x80000000;
 	sbus_writel(dev->control_reg, &dev->regs->control);
 	udelay(100);
 	sbus_writel(0x0f000000, &dev->regs->i2c_magic2);

 	vfc_memptr_reset(dev);

 	dev->control_reg &= ~VFC_CONTROL_DIAGMODE;
 	dev->control_reg &= ~VFC_CONTROL_CAPTURE;
 	dev->control_reg |= 0x40000000;
 	sbus_writel(dev->control_reg, &dev->regs->control);

 	vfc_captstat_reset(dev);

 	return 0;
 }

 int vfc_saa9051_init(struct vfc_dev *dev)
 {
 	int i;

 	for (i = 0; i < VFC_SAA9051_NR; i++)
 		dev->saa9051_state_array[i] = saa9051_init_array[i];

 	vfc_i2c_sendbuf(dev,VFC_SAA9051_ADDR,
 			dev->saa9051_state_array, VFC_SAA9051_NR);
 	return 0;
 }

 int init_vfc_hw(struct vfc_dev *dev)
 {
 	vfc_lock_device(dev);
 	vfc_csr_init(dev);

 	vfc_pcf8584_init(dev);
 	vfc_init_i2c_bus(dev); /* hopefully this doesn't undo the magic
 				  sun code above*/
 	vfc_saa9051_init(dev);
 	vfc_unlock_device(dev);
 	return 0;
 }

 int init_vfc_devstruct(struct vfc_dev *dev, int instance)
 {
 	dev->instance=instance;
 	init_MUTEX(&dev->device_lock_sem);
 	dev->control_reg=0;
 	dev->busy=0;
 	return 0;
 }

 int init_vfc_device(struct sbus_dev *sdev,struct vfc_dev *dev, int instance)
 {
 	if(dev == NULL) {
 		printk(KERN_ERR "VFC: Bogus pointer passed\n");
 		return -ENOMEM;
 	}
 	printk("Initializing vfc%d\n",instance);
 	dev->regs = NULL;
 	dev->regs = (volatile struct vfc_regs __iomem *)
 		sbus_ioremap(&sdev->resource[0], 0,
 			     sizeof(struct vfc_regs), vfcstr);
 	dev->which_io = sdev->reg_addrs[0].which_io;
 	dev->phys_regs = (struct vfc_regs *) sdev->reg_addrs[0].phys_addr;
 	if (dev->regs == NULL)
 		return -EIO;

 	printk("vfc%d: registers mapped at phys_addr: 0x%lx\n    virt_addr: 0x%lx\n",
 	       instance,(unsigned long)sdev->reg_addrs[0].phys_addr,(unsigned long)dev->regs);

 	if (init_vfc_devstruct(dev, instance))
 		return -EINVAL;
 	if (init_vfc_hw(dev))
 		return -EIO;
 	return 0;
 }


 struct vfc_dev *vfc_get_dev_ptr(int instance)
 {
 	return vfc_dev_lst[instance];
 }

 static DEFINE_SPINLOCK(vfc_dev_lock);

 static int vfc_open(struct inode *inode, struct file *file)
 {
 	struct vfc_dev *dev;

 	spin_lock(&vfc_dev_lock);
 	dev = vfc_get_dev_ptr(iminor(inode));
 	if (dev == NULL) {
 		spin_unlock(&vfc_dev_lock);
 		return -ENODEV;
 	}
 	if (dev->busy) {
 		spin_unlock(&vfc_dev_lock);
 		return -EBUSY;
 	}

 	dev->busy = 1;
 	spin_unlock(&vfc_dev_lock);

 	vfc_lock_device(dev);

 	vfc_csr_init(dev);
 	vfc_pcf8584_init(dev);
 	vfc_init_i2c_bus(dev);
 	vfc_saa9051_init(dev);
 	vfc_memptr_reset(dev);
 	vfc_captstat_reset(dev);

 	vfc_unlock_device(dev);
 	return 0;
 }

 static int vfc_release(struct inode *inode,struct file *file)
 {
 	struct vfc_dev *dev;

 	spin_lock(&vfc_dev_lock);
 	dev = vfc_get_dev_ptr(iminor(inode));
 	if (!dev || !dev->busy) {
 		spin_unlock(&vfc_dev_lock);
 		return -EINVAL;
 	}
 	dev->busy = 0;
 	spin_unlock(&vfc_dev_lock);
 	return 0;
 }

 static int vfc_debug(struct vfc_dev *dev, int cmd, void __user *argp)
 {
 	struct vfc_debug_inout inout;
 	unsigned char *buffer;

 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;

 	switch(cmd) {
 	case VFC_I2C_SEND:
 		if(copy_from_user(&inout, argp, sizeof(inout)))
 			return -EFAULT;

 		buffer = kmalloc(inout.len, GFP_KERNEL);
 		if (buffer == NULL)
 			return -ENOMEM;

 		if(copy_from_user(buffer, inout.buffer, inout.len)) {
 			kfree(buffer);
 			return -EFAULT;
 		}


 		vfc_lock_device(dev);
 		inout.ret=
 			vfc_i2c_sendbuf(dev,inout.addr & 0xff,
 					buffer,inout.len);

 		if (copy_to_user(argp,&inout,sizeof(inout))) {
 			kfree(buffer);
 			return -EFAULT;
 		}
 		vfc_unlock_device(dev);

 		break;
 	case VFC_I2C_RECV:
 		if (copy_from_user(&inout, argp, sizeof(inout)))
 			return -EFAULT;

 		buffer = kzalloc(inout.len, GFP_KERNEL);
 		if (buffer == NULL)
 			return -ENOMEM;

 		vfc_lock_device(dev);
 		inout.ret=
 			vfc_i2c_recvbuf(dev,inout.addr & 0xff
 					,buffer,inout.len);
 		vfc_unlock_device(dev);

 		if (copy_to_user(inout.buffer, buffer, inout.len)) {
 			kfree(buffer);
 			return -EFAULT;
 		}
 		if (copy_to_user(argp,&inout,sizeof(inout))) {
 			kfree(buffer);
 			return -EFAULT;
 		}
 		kfree(buffer);
 		break;
 	default:
 		return -EINVAL;
 	};

 	return 0;
 }

 int vfc_capture_start(struct vfc_dev *dev)
 {
 	vfc_captstat_reset(dev);
 	dev->control_reg = sbus_readl(&dev->regs->control);
 	if((dev->control_reg & VFC_STATUS_CAPTURE)) {
 		printk(KERN_ERR "vfc%d: vfc capture status not reset\n",
 		       dev->instance);
 		return -EIO;
 	}

 	vfc_lock_device(dev);
 	dev->control_reg &= ~VFC_CONTROL_CAPTURE;
 	sbus_writel(dev->control_reg, &dev->regs->control);
 	dev->control_reg |= VFC_CONTROL_CAPTURE;
 	sbus_writel(dev->control_reg, &dev->regs->control);
 	dev->control_reg &= ~VFC_CONTROL_CAPTURE;
 	sbus_writel(dev->control_reg, &dev->regs->control);
 	vfc_unlock_device(dev);

 	return 0;
 }

 int vfc_capture_poll(struct vfc_dev *dev)
 {
 	int timeout = 1000;

 	while (!timeout--) {
 		if (sbus_readl(&dev->regs->control) & VFC_STATUS_CAPTURE)
 			break;
 		vfc_i2c_delay_no_busy(dev, 100);
 	}
 	if(!timeout) {
 		printk(KERN_WARNING "vfc%d: capture timed out\n",
 		       dev->instance);
 		return -ETIMEDOUT;
 	}
 	return 0;
 }


 static int vfc_set_control_ioctl(struct inode *inode, struct file *file,
 			  struct vfc_dev *dev, unsigned long arg)
 {
 	int setcmd, ret = 0;

 	if (copy_from_user(&setcmd,(void __user *)arg,sizeof(unsigned int)))
 		return -EFAULT;

 	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCSCTRL) arg=0x%x\n",
 				dev->instance,setcmd));

 	switch(setcmd) {
 	case MEMPRST:
 		vfc_lock_device(dev);
 		vfc_memptr_reset(dev);
 		vfc_unlock_device(dev);
 		ret=0;
 		break;
 	case CAPTRCMD:
 		vfc_capture_start(dev);
 		vfc_capture_poll(dev);
 		break;
 	case DIAGMODE:
 		if(capable(CAP_SYS_ADMIN)) {
 			vfc_lock_device(dev);
 			dev->control_reg |= VFC_CONTROL_DIAGMODE;
 			sbus_writel(dev->control_reg, &dev->regs->control);
 			vfc_unlock_device(dev);
 			ret = 0;
 		} else {
 			ret = -EPERM;
 		}
 		break;
 	case NORMMODE:
 		vfc_lock_device(dev);
 		dev->control_reg &= ~VFC_CONTROL_DIAGMODE;
 		sbus_writel(dev->control_reg, &dev->regs->control);
 		vfc_unlock_device(dev);
 		ret = 0;
 		break;
 	case CAPTRSTR:
 		vfc_capture_start(dev);
 		ret = 0;
 		break;
 	case CAPTRWAIT:
 		vfc_capture_poll(dev);
 		ret = 0;
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	};

 	return ret;
 }


 int vfc_port_change_ioctl(struct inode *inode, struct file *file,
 			  struct vfc_dev *dev, unsigned long arg)
 {
 	int ret = 0;
 	int cmd;

 	if(copy_from_user(&cmd, (void __user *)arg, sizeof(unsigned int))) {
 		VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer to "
 					"vfc_port_change_ioctl\n",
 					dev->instance));
 		return -EFAULT;
 	}

 	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCPORTCHG) arg=0x%x\n",
 				dev->instance, cmd));

 	switch(cmd) {
 	case 1:
 	case 2:
 		VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_START) = 0x72;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_STOP) = 0x52;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_HC_START) = 0x36;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_HC_STOP) = 0x18;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) = VFC_SAA9051_BP2;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_C3) = VFC_SAA9051_CT | VFC_SAA9051_SS3;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_SECAM_DELAY) = 0x3e;
 		break;
 	case 3:
 		VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_START) = 0x3a;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_STOP) = 0x17;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_HC_START) = 0xfa;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_HC_STOP) = 0xde;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) =
 			VFC_SAA9051_BY | VFC_SAA9051_PF | VFC_SAA9051_BP2;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_C3) = VFC_SAA9051_YC;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_SECAM_DELAY) = 0;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_C2) &=
 			~(VFC_SAA9051_SS0 | VFC_SAA9051_SS1);
 		break;
 	default:
 		ret = -EINVAL;
 		return ret;
 		break;
 	}

 	switch(cmd) {
 	case 1:
 		VFC_SAA9051_SA(dev,VFC_SAA9051_C2) |=
 			(VFC_SAA9051_SS0 | VFC_SAA9051_SS1);
 		break;
 	case 2:
 		VFC_SAA9051_SA(dev,VFC_SAA9051_C2) &=
 			~(VFC_SAA9051_SS0 | VFC_SAA9051_SS1);
 		VFC_SAA9051_SA(dev,VFC_SAA9051_C2) |= VFC_SAA9051_SS0;
 		break;
 	case 3:
 		break;
 	default:
 		ret = -EINVAL;
 		return ret;
 		break;
 	}
 	VFC_SAA9051_SA(dev,VFC_SAA9051_C3) &= ~(VFC_SAA9051_SS2);
 	ret=vfc_update_saa9051(dev);
 	udelay(500);
 	VFC_SAA9051_SA(dev,VFC_SAA9051_C3) |= (VFC_SAA9051_SS2);
 	ret=vfc_update_saa9051(dev);
 	return ret;
 }

 int vfc_set_video_ioctl(struct inode *inode, struct file *file,
 			struct vfc_dev *dev, unsigned long arg)
 {
 	int ret = 0;
 	int cmd;

 	if(copy_from_user(&cmd, (void __user *)arg, sizeof(unsigned int))) {
 		VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer to "
 					"vfc_set_video_ioctl\n",
 					dev->instance));
 		return ret;
 	}

 	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCSVID) arg=0x%x\n",
 				dev->instance, cmd));
 	switch(cmd) {
 	case STD_NTSC:
 		VFC_SAA9051_SA(dev,VFC_SAA9051_C1) &= ~VFC_SAA9051_ALT;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_C1) |= VFC_SAA9051_YPN |
 			VFC_SAA9051_CCFR0 | VFC_SAA9051_CCFR1 | VFC_SAA9051_FS;
 		ret = vfc_update_saa9051(dev);
 		break;
 	case STD_PAL:
 		VFC_SAA9051_SA(dev,VFC_SAA9051_C1) &= ~(VFC_SAA9051_YPN |
 							VFC_SAA9051_CCFR1 |
 							VFC_SAA9051_CCFR0 |
 							VFC_SAA9051_FS);
 		VFC_SAA9051_SA(dev,VFC_SAA9051_C1) |= VFC_SAA9051_ALT;
 		ret = vfc_update_saa9051(dev);
 		break;

 	case COLOR_ON:
 		VFC_SAA9051_SA(dev,VFC_SAA9051_C1) |= VFC_SAA9051_CO;
 		VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) &=
 			~(VFC_SAA9051_BY | VFC_SAA9051_PF);
 		ret = vfc_update_saa9051(dev);
 		break;
 	case MONO:
 		VFC_SAA9051_SA(dev,VFC_SAA9051_C1) &= ~(VFC_SAA9051_CO);
 		VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) |=
 			(VFC_SAA9051_BY | VFC_SAA9051_PF);
 		ret = vfc_update_saa9051(dev);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	};

 	return ret;
 }

 int vfc_get_video_ioctl(struct inode *inode, struct file *file,
 			struct vfc_dev *dev, unsigned long arg)
 {
 	int ret = 0;
 	unsigned int status = NO_LOCK;
 	unsigned char buf[1];

 	if(vfc_i2c_recvbuf(dev, VFC_SAA9051_ADDR, buf, 1)) {
 		printk(KERN_ERR "vfc%d: Unable to get status\n",
 		       dev->instance);
 		return -EIO;
 	}

 	if(buf[0] & VFC_SAA9051_HLOCK) {
 		status = NO_LOCK;
 	} else if(buf[0] & VFC_SAA9051_FD) {
 		if(buf[0] & VFC_SAA9051_CD)
 			status = NTSC_COLOR;
 		else
 			status = NTSC_NOCOLOR;
 	} else {
 		if(buf[0] & VFC_SAA9051_CD)
 			status = PAL_COLOR;
 		else
 			status = PAL_NOCOLOR;
 	}
 	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCGVID) returning status 0x%x; "
 				"buf[0]=%x\n", dev->instance, status, buf[0]));

 	if (copy_to_user((void __user *)arg,&status,sizeof(unsigned int))) {
 		VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer to "
 					"vfc_get_video_ioctl\n",
 					dev->instance));
 		return ret;
 	}
 	return ret;
 }

 static int vfc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 	      unsigned long arg)
 {
 	int ret = 0;
 	unsigned int tmp;
 	struct vfc_dev *dev;
 	void __user *argp = (void __user *)arg;

 	dev = vfc_get_dev_ptr(iminor(inode));
 	if(dev == NULL)
 		return -ENODEV;

 	switch(cmd & 0x0000ffff) {
 	case VFCGCTRL:
 #if 0
 		VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCGCTRL)\n", dev->instance));
 #endif
 		tmp = sbus_readl(&dev->regs->control);
 		if(copy_to_user(argp, &tmp, sizeof(unsigned int))) {
 			ret = -EFAULT;
 			break;
 		}
 		ret = 0;
 		break;
 	case VFCSCTRL:
 		ret = vfc_set_control_ioctl(inode, file, dev, arg);
 		break;
 	case VFCGVID:
 		ret = vfc_get_video_ioctl(inode, file, dev, arg);
 		break;
 	case VFCSVID:
 		ret = vfc_set_video_ioctl(inode, file, dev, arg);
 		break;
 	case VFCHUE:
 		VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCHUE)\n", dev->instance));
 		if(copy_from_user(&tmp,argp,sizeof(unsigned int))) {
 			VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer "
 						"to IOCTL(VFCHUE)", dev->instance));
 			ret = -EFAULT;
 		} else {
 			VFC_SAA9051_SA(dev,VFC_SAA9051_HUE) = tmp;
 			vfc_update_saa9051(dev);
 			ret = 0;
 		}
 		break;
 	case VFCPORTCHG:
 		ret = vfc_port_change_ioctl(inode, file, dev, arg);
 		break;
 	case VFCRDINFO:
 		ret = -EINVAL;
 		VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCRDINFO)\n", dev->instance));
 		break;
 	default:
 		ret = vfc_debug(vfc_get_dev_ptr(iminor(inode)), cmd, argp);
 		break;
 	};

 	return ret;
 }

 static int vfc_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	unsigned int map_size, ret, map_offset;
 	struct vfc_dev *dev;

 	dev = vfc_get_dev_ptr(iminor(file->f_path.dentry->d_inode));
 	if(dev == NULL)
 		return -ENODEV;

 	map_size = vma->vm_end - vma->vm_start;
 	if(map_size > sizeof(struct vfc_regs))
 		map_size = sizeof(struct vfc_regs);

 	vma->vm_flags |=
 		(VM_MAYREAD | VM_MAYWRITE | VM_MAYSHARE);
 	map_offset = (unsigned int) (long)dev->phys_regs;
 	ret = io_remap_pfn_range(vma, vma->vm_start,
 				  MK_IOSPACE_PFN(dev->which_io,
 					map_offset >> PAGE_SHIFT),
 				  map_size, vma->vm_page_prot);

 	if(ret)
 		return -EAGAIN;

 	return 0;
 }


 static const struct file_operations vfc_fops = {
 	.owner =	THIS_MODULE,
 	.llseek =	no_llseek,
 	.ioctl =	vfc_ioctl,
 	.mmap =		vfc_mmap,
 	.open =		vfc_open,
 	.release =	vfc_release,
 };

 static int vfc_probe(void)
 {
 	struct sbus_bus *sbus;
 	struct sbus_dev *sdev = NULL;
 	int ret;
 	int instance = 0, cards = 0;

 	for_all_sbusdev(sdev, sbus) {
 		if (strcmp(sdev->prom_name, "vfc") == 0) {
 			cards++;
 			continue;
 		}
 	}

 	if (!cards)
 		return -ENODEV;

 	vfc_dev_lst = kmalloc(sizeof(struct vfc_dev *) *
 						 (cards+1),
 						 GFP_KERNEL);
 	if (vfc_dev_lst == NULL)
 		return -ENOMEM;
 	memset(vfc_dev_lst, 0, sizeof(struct vfc_dev *) * (cards + 1));
 	vfc_dev_lst[cards] = NULL;

 	ret = register_chrdev(VFC_MAJOR, vfcstr, &vfc_fops);
 	if(ret) {
 		printk(KERN_ERR "Unable to get major number %d\n", VFC_MAJOR);
 		kfree(vfc_dev_lst);
 		return -EIO;
 	}
 	instance = 0;
 	for_all_sbusdev(sdev, sbus) {
 		if (strcmp(sdev->prom_name, "vfc") == 0) {
 			vfc_dev_lst[instance]=(struct vfc_dev *)
 				kmalloc(sizeof(struct vfc_dev), GFP_KERNEL);
 			if (vfc_dev_lst[instance] == NULL)
 				return -ENOMEM;
 			ret = init_vfc_device(sdev,
 					      vfc_dev_lst[instance],
 					      instance);
 			if(ret) {
 				printk(KERN_ERR "Unable to initialize"
 				       " vfc%d device\n",
 				       instance);
 			} else {
 			}

 			instance++;
 			continue;
 		}
 	}

 	return 0;
 }

 #ifdef MODULE
 int init_module(void)
 #else
 int vfc_init(void)
 #endif
 {
 	return vfc_probe();
 }

 #ifdef MODULE
 static void deinit_vfc_device(struct vfc_dev *dev)
 {
 	if(dev == NULL)
 		return;
 	sbus_iounmap(dev->regs, sizeof(struct vfc_regs));
 	kfree(dev);
 }

 void cleanup_module(void)
 {
 	struct vfc_dev **devp;

 	unregister_chrdev(VFC_MAJOR,vfcstr);

 	for (devp = vfc_dev_lst; *devp; devp++)
 		deinit_vfc_device(*devp);

 	kfree(vfc_dev_lst);
 	return;
 }
 #endif

 MODULE_LICENSE("GPL");
	/*
	* drivers/sbus/char/vfc_dev.c
	*
	* Driver for the Videopix Frame Grabber.
	*
	* In order to use the VFC you need to program the video controller
	* chip. This chip is the Phillips SAA9051. You need to call their
	* documentation ordering line to get the docs.
	*
	* There is very little documentation on the VFC itself. There is
	* some useful info that can be found in the manuals that come with
	* the card. I will hopefully write some better docs at a later date.
	*
	* Copyright (C) 1996 Manish Vachharajani (mvachhar@noc.rutgers.edu)
	* */

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/string.h>
	#include <linux/slab.h>
	#include <linux/errno.h>
	#include <linux/fs.h>
	#include <linux/smp_lock.h>
	#include <linux/delay.h>
	#include <linux/spinlock.h>
	#include <linux/mm.h>

	#include <asm/openprom.h>
	#include <asm/oplib.h>
	#include <asm/io.h>
	#include <asm/system.h>
	#include <asm/sbus.h>
	#include <asm/page.h>
	#include <asm/pgtable.h>
	#include <asm/uaccess.h>

	#define VFC_MAJOR (60)

	#if 0
	#define VFC_IOCTL_DEBUG
	#endif

	#include "vfc.h"
	#include <asm/vfc_ioctls.h>

	static const struct file_operations vfc_fops;
	struct vfc_dev **vfc_dev_lst;
	static char vfcstr[]="vfc";
	static unsigned char saa9051_init_array[VFC_SAA9051_NR] = {
	0x00, 0x64, 0x72, 0x52,
	0x36, 0x18, 0xff, 0x20,
	0xfc, 0x77, 0xe3, 0x50,
	0x3e
	};

	void vfc_lock_device(struct vfc_dev *dev)
	{
	down(&dev->device_lock_sem);
	}

	void vfc_unlock_device(struct vfc_dev *dev)
	{
	up(&dev->device_lock_sem);
	}


	void vfc_captstat_reset(struct vfc_dev *dev)
	{
	dev->control_reg \|= VFC_CONTROL_CAPTRESET;
	sbus_writel(dev->control_reg, &dev->regs->control);
	dev->control_reg &= ~VFC_CONTROL_CAPTRESET;
	sbus_writel(dev->control_reg, &dev->regs->control);
	dev->control_reg \|= VFC_CONTROL_CAPTRESET;
	sbus_writel(dev->control_reg, &dev->regs->control);
	}

	void vfc_memptr_reset(struct vfc_dev *dev)
	{
	dev->control_reg \|= VFC_CONTROL_MEMPTR;
	sbus_writel(dev->control_reg, &dev->regs->control);
	dev->control_reg &= ~VFC_CONTROL_MEMPTR;
	sbus_writel(dev->control_reg, &dev->regs->control);
	dev->control_reg \|= VFC_CONTROL_MEMPTR;
	sbus_writel(dev->control_reg, &dev->regs->control);
	}

	int vfc_csr_init(struct vfc_dev *dev)
	{
	dev->control_reg = 0x80000000;
	sbus_writel(dev->control_reg, &dev->regs->control);
	udelay(200);
	dev->control_reg &= ~0x80000000;
	sbus_writel(dev->control_reg, &dev->regs->control);
	udelay(100);
	sbus_writel(0x0f000000, &dev->regs->i2c_magic2);

	vfc_memptr_reset(dev);

	dev->control_reg &= ~VFC_CONTROL_DIAGMODE;
	dev->control_reg &= ~VFC_CONTROL_CAPTURE;
	dev->control_reg \|= 0x40000000;
	sbus_writel(dev->control_reg, &dev->regs->control);

	vfc_captstat_reset(dev);

	return 0;
	}

	int vfc_saa9051_init(struct vfc_dev *dev)
	{
	int i;

	for (i = 0; i < VFC_SAA9051_NR; i++)
	dev->saa9051_state_array[i] = saa9051_init_array[i];

	vfc_i2c_sendbuf(dev,VFC_SAA9051_ADDR,
	dev->saa9051_state_array, VFC_SAA9051_NR);
	return 0;
	}

	int init_vfc_hw(struct vfc_dev *dev)
	{
	vfc_lock_device(dev);
	vfc_csr_init(dev);

	vfc_pcf8584_init(dev);
	vfc_init_i2c_bus(dev); /* hopefully this doesn't undo the magic
	sun code above*/
	vfc_saa9051_init(dev);
	vfc_unlock_device(dev);
	return 0;
	}

	int init_vfc_devstruct(struct vfc_dev *dev, int instance)
	{
	dev->instance=instance;
	init_MUTEX(&dev->device_lock_sem);
	dev->control_reg=0;
	dev->busy=0;
	return 0;
	}

	int init_vfc_device(struct sbus_dev sdev,struct vfc_dev dev, int instance)
	{
	if(dev == NULL) {
	printk(KERN_ERR "VFC: Bogus pointer passed\n");
	return -ENOMEM;
	}
	printk("Initializing vfc%d\n",instance);
	dev->regs = NULL;
	dev->regs = (volatile struct vfc_regs __iomem *)
	sbus_ioremap(&sdev->resource[0], 0,
	sizeof(struct vfc_regs), vfcstr);
	dev->which_io = sdev->reg_addrs[0].which_io;
	dev->phys_regs = (struct vfc_regs *) sdev->reg_addrs[0].phys_addr;
	if (dev->regs == NULL)
	return -EIO;

	printk("vfc%d: registers mapped at phys_addr: 0x%lx\n virt_addr: 0x%lx\n",
	instance,(unsigned long)sdev->reg_addrs[0].phys_addr,(unsigned long)dev->regs);

	if (init_vfc_devstruct(dev, instance))
	return -EINVAL;
	if (init_vfc_hw(dev))
	return -EIO;
	return 0;
	}


	struct vfc_dev *vfc_get_dev_ptr(int instance)
	{
	return vfc_dev_lst[instance];
	}

	static DEFINE_SPINLOCK(vfc_dev_lock);

	static int vfc_open(struct inode inode, struct file file)
	{
	struct vfc_dev *dev;

	spin_lock(&vfc_dev_lock);
	dev = vfc_get_dev_ptr(iminor(inode));
	if (dev == NULL) {
	spin_unlock(&vfc_dev_lock);
	return -ENODEV;
	}
	if (dev->busy) {
	spin_unlock(&vfc_dev_lock);
	return -EBUSY;
	}

	dev->busy = 1;
	spin_unlock(&vfc_dev_lock);

	vfc_lock_device(dev);

	vfc_csr_init(dev);
	vfc_pcf8584_init(dev);
	vfc_init_i2c_bus(dev);
	vfc_saa9051_init(dev);
	vfc_memptr_reset(dev);
	vfc_captstat_reset(dev);

	vfc_unlock_device(dev);
	return 0;
	}

	static int vfc_release(struct inode inode,struct file file)
	{
	struct vfc_dev *dev;

	spin_lock(&vfc_dev_lock);
	dev = vfc_get_dev_ptr(iminor(inode));
	if (!dev \|\| !dev->busy) {
	spin_unlock(&vfc_dev_lock);
	return -EINVAL;
	}
	dev->busy = 0;
	spin_unlock(&vfc_dev_lock);
	return 0;
	}

	static int vfc_debug(struct vfc_dev dev, int cmd, void __user argp)
	{
	struct vfc_debug_inout inout;
	unsigned char *buffer;

	if (!capable(CAP_SYS_ADMIN))
	return -EPERM;

	switch(cmd) {
	case VFC_I2C_SEND:
	if(copy_from_user(&inout, argp, sizeof(inout)))
	return -EFAULT;

	buffer = kmalloc(inout.len, GFP_KERNEL);
	if (buffer == NULL)
	return -ENOMEM;

	if(copy_from_user(buffer, inout.buffer, inout.len)) {
	kfree(buffer);
	return -EFAULT;
	}


	vfc_lock_device(dev);
	inout.ret=
	vfc_i2c_sendbuf(dev,inout.addr & 0xff,
	buffer,inout.len);

	if (copy_to_user(argp,&inout,sizeof(inout))) {
	kfree(buffer);
	return -EFAULT;
	}
	vfc_unlock_device(dev);

	break;
	case VFC_I2C_RECV:
	if (copy_from_user(&inout, argp, sizeof(inout)))
	return -EFAULT;

	buffer = kzalloc(inout.len, GFP_KERNEL);
	if (buffer == NULL)
	return -ENOMEM;

	vfc_lock_device(dev);
	inout.ret=
	vfc_i2c_recvbuf(dev,inout.addr & 0xff
	,buffer,inout.len);
	vfc_unlock_device(dev);

	if (copy_to_user(inout.buffer, buffer, inout.len)) {
	kfree(buffer);
	return -EFAULT;
	}
	if (copy_to_user(argp,&inout,sizeof(inout))) {
	kfree(buffer);
	return -EFAULT;
	}
	kfree(buffer);
	break;
	default:
	return -EINVAL;
	};

	return 0;
	}

	int vfc_capture_start(struct vfc_dev *dev)
	{
	vfc_captstat_reset(dev);
	dev->control_reg = sbus_readl(&dev->regs->control);
	if((dev->control_reg & VFC_STATUS_CAPTURE)) {
	printk(KERN_ERR "vfc%d: vfc capture status not reset\n",
	dev->instance);
	return -EIO;
	}

	vfc_lock_device(dev);
	dev->control_reg &= ~VFC_CONTROL_CAPTURE;
	sbus_writel(dev->control_reg, &dev->regs->control);
	dev->control_reg \|= VFC_CONTROL_CAPTURE;
	sbus_writel(dev->control_reg, &dev->regs->control);
	dev->control_reg &= ~VFC_CONTROL_CAPTURE;
	sbus_writel(dev->control_reg, &dev->regs->control);
	vfc_unlock_device(dev);

	return 0;
	}

	int vfc_capture_poll(struct vfc_dev *dev)
	{
	int timeout = 1000;

	while (!timeout--) {
	if (sbus_readl(&dev->regs->control) & VFC_STATUS_CAPTURE)
	break;
	vfc_i2c_delay_no_busy(dev, 100);
	}
	if(!timeout) {
	printk(KERN_WARNING "vfc%d: capture timed out\n",
	dev->instance);
	return -ETIMEDOUT;
	}
	return 0;
	}



	static int vfc_set_control_ioctl(struct inode inode, struct file file,
	struct vfc_dev *dev, unsigned long arg)
	{
	int setcmd, ret = 0;

	if (copy_from_user(&setcmd,(void __user *)arg,sizeof(unsigned int)))
	return -EFAULT;

	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCSCTRL) arg=0x%x\n",
	dev->instance,setcmd));

	switch(setcmd) {
	case MEMPRST:
	vfc_lock_device(dev);
	vfc_memptr_reset(dev);
	vfc_unlock_device(dev);
	ret=0;
	break;
	case CAPTRCMD:
	vfc_capture_start(dev);
	vfc_capture_poll(dev);
	break;
	case DIAGMODE:
	if(capable(CAP_SYS_ADMIN)) {
	vfc_lock_device(dev);
	dev->control_reg \|= VFC_CONTROL_DIAGMODE;
	sbus_writel(dev->control_reg, &dev->regs->control);
	vfc_unlock_device(dev);
	ret = 0;
	} else {
	ret = -EPERM;
	}
	break;
	case NORMMODE:
	vfc_lock_device(dev);
	dev->control_reg &= ~VFC_CONTROL_DIAGMODE;
	sbus_writel(dev->control_reg, &dev->regs->control);
	vfc_unlock_device(dev);
	ret = 0;
	break;
	case CAPTRSTR:
	vfc_capture_start(dev);
	ret = 0;
	break;
	case CAPTRWAIT:
	vfc_capture_poll(dev);
	ret = 0;
	break;
	default:
	ret = -EINVAL;
	break;
	};

	return ret;
	}


	int vfc_port_change_ioctl(struct inode inode, struct file file,
	struct vfc_dev *dev, unsigned long arg)
	{
	int ret = 0;
	int cmd;

	if(copy_from_user(&cmd, (void __user *)arg, sizeof(unsigned int))) {
	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer to "
	"vfc_port_change_ioctl\n",
	dev->instance));
	return -EFAULT;
	}

	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCPORTCHG) arg=0x%x\n",
	dev->instance, cmd));

	switch(cmd) {
	case 1:
	case 2:
	VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_START) = 0x72;
	VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_STOP) = 0x52;
	VFC_SAA9051_SA(dev,VFC_SAA9051_HC_START) = 0x36;
	VFC_SAA9051_SA(dev,VFC_SAA9051_HC_STOP) = 0x18;
	VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) = VFC_SAA9051_BP2;
	VFC_SAA9051_SA(dev,VFC_SAA9051_C3) = VFC_SAA9051_CT \| VFC_SAA9051_SS3;
	VFC_SAA9051_SA(dev,VFC_SAA9051_SECAM_DELAY) = 0x3e;
	break;
	case 3:
	VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_START) = 0x3a;
	VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_STOP) = 0x17;
	VFC_SAA9051_SA(dev,VFC_SAA9051_HC_START) = 0xfa;
	VFC_SAA9051_SA(dev,VFC_SAA9051_HC_STOP) = 0xde;
	VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) =
	VFC_SAA9051_BY \| VFC_SAA9051_PF \| VFC_SAA9051_BP2;
	VFC_SAA9051_SA(dev,VFC_SAA9051_C3) = VFC_SAA9051_YC;
	VFC_SAA9051_SA(dev,VFC_SAA9051_SECAM_DELAY) = 0;
	VFC_SAA9051_SA(dev,VFC_SAA9051_C2) &=
	~(VFC_SAA9051_SS0 \| VFC_SAA9051_SS1);
	break;
	default:
	ret = -EINVAL;
	return ret;
	break;
	}

	switch(cmd) {
	case 1:
	VFC_SAA9051_SA(dev,VFC_SAA9051_C2) \|=
	(VFC_SAA9051_SS0 \| VFC_SAA9051_SS1);
	break;
	case 2:
	VFC_SAA9051_SA(dev,VFC_SAA9051_C2) &=
	~(VFC_SAA9051_SS0 \| VFC_SAA9051_SS1);
	VFC_SAA9051_SA(dev,VFC_SAA9051_C2) \|= VFC_SAA9051_SS0;
	break;
	case 3:
	break;
	default:
	ret = -EINVAL;
	return ret;
	break;
	}
	VFC_SAA9051_SA(dev,VFC_SAA9051_C3) &= ~(VFC_SAA9051_SS2);
	ret=vfc_update_saa9051(dev);
	udelay(500);
	VFC_SAA9051_SA(dev,VFC_SAA9051_C3) \|= (VFC_SAA9051_SS2);
	ret=vfc_update_saa9051(dev);
	return ret;
	}

	int vfc_set_video_ioctl(struct inode inode, struct file file,
	struct vfc_dev *dev, unsigned long arg)
	{
	int ret = 0;
	int cmd;

	if(copy_from_user(&cmd, (void __user *)arg, sizeof(unsigned int))) {
	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer to "
	"vfc_set_video_ioctl\n",
	dev->instance));
	return ret;
	}

	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCSVID) arg=0x%x\n",
	dev->instance, cmd));
	switch(cmd) {
	case STD_NTSC:
	VFC_SAA9051_SA(dev,VFC_SAA9051_C1) &= ~VFC_SAA9051_ALT;
	VFC_SAA9051_SA(dev,VFC_SAA9051_C1) \|= VFC_SAA9051_YPN \|
	VFC_SAA9051_CCFR0 \| VFC_SAA9051_CCFR1 \| VFC_SAA9051_FS;
	ret = vfc_update_saa9051(dev);
	break;
	case STD_PAL:
	VFC_SAA9051_SA(dev,VFC_SAA9051_C1) &= ~(VFC_SAA9051_YPN \|
	VFC_SAA9051_CCFR1 \|
	VFC_SAA9051_CCFR0 \|
	VFC_SAA9051_FS);
	VFC_SAA9051_SA(dev,VFC_SAA9051_C1) \|= VFC_SAA9051_ALT;
	ret = vfc_update_saa9051(dev);
	break;

	case COLOR_ON:
	VFC_SAA9051_SA(dev,VFC_SAA9051_C1) \|= VFC_SAA9051_CO;
	VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) &=
	~(VFC_SAA9051_BY \| VFC_SAA9051_PF);
	ret = vfc_update_saa9051(dev);
	break;
	case MONO:
	VFC_SAA9051_SA(dev,VFC_SAA9051_C1) &= ~(VFC_SAA9051_CO);
	VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) \|=
	(VFC_SAA9051_BY \| VFC_SAA9051_PF);
	ret = vfc_update_saa9051(dev);
	break;
	default:
	ret = -EINVAL;
	break;
	};

	return ret;
	}

	int vfc_get_video_ioctl(struct inode inode, struct file file,
	struct vfc_dev *dev, unsigned long arg)
	{
	int ret = 0;
	unsigned int status = NO_LOCK;
	unsigned char buf[1];

	if(vfc_i2c_recvbuf(dev, VFC_SAA9051_ADDR, buf, 1)) {
	printk(KERN_ERR "vfc%d: Unable to get status\n",
	dev->instance);
	return -EIO;
	}

	if(buf[0] & VFC_SAA9051_HLOCK) {
	status = NO_LOCK;
	} else if(buf[0] & VFC_SAA9051_FD) {
	if(buf[0] & VFC_SAA9051_CD)
	status = NTSC_COLOR;
	else
	status = NTSC_NOCOLOR;
	} else {
	if(buf[0] & VFC_SAA9051_CD)
	status = PAL_COLOR;
	else
	status = PAL_NOCOLOR;
	}
	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCGVID) returning status 0x%x; "
	"buf[0]=%x\n", dev->instance, status, buf[0]));

	if (copy_to_user((void __user *)arg,&status,sizeof(unsigned int))) {
	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer to "
	"vfc_get_video_ioctl\n",
	dev->instance));
	return ret;
	}
	return ret;
	}

	static int vfc_ioctl(struct inode inode, struct file file, unsigned int cmd,
	unsigned long arg)
	{
	int ret = 0;
	unsigned int tmp;
	struct vfc_dev *dev;
	void __user argp = (void __user )arg;

	dev = vfc_get_dev_ptr(iminor(inode));
	if(dev == NULL)
	return -ENODEV;

	switch(cmd & 0x0000ffff) {
	case VFCGCTRL:
	#if 0
	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCGCTRL)\n", dev->instance));
	#endif
	tmp = sbus_readl(&dev->regs->control);
	if(copy_to_user(argp, &tmp, sizeof(unsigned int))) {
	ret = -EFAULT;
	break;
	}
	ret = 0;
	break;
	case VFCSCTRL:
	ret = vfc_set_control_ioctl(inode, file, dev, arg);
	break;
	case VFCGVID:
	ret = vfc_get_video_ioctl(inode, file, dev, arg);
	break;
	case VFCSVID:
	ret = vfc_set_video_ioctl(inode, file, dev, arg);
	break;
	case VFCHUE:
	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCHUE)\n", dev->instance));
	if(copy_from_user(&tmp,argp,sizeof(unsigned int))) {
	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer "
	"to IOCTL(VFCHUE)", dev->instance));
	ret = -EFAULT;
	} else {
	VFC_SAA9051_SA(dev,VFC_SAA9051_HUE) = tmp;
	vfc_update_saa9051(dev);
	ret = 0;
	}
	break;
	case VFCPORTCHG:
	ret = vfc_port_change_ioctl(inode, file, dev, arg);
	break;
	case VFCRDINFO:
	ret = -EINVAL;
	VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCRDINFO)\n", dev->instance));
	break;
	default:
	ret = vfc_debug(vfc_get_dev_ptr(iminor(inode)), cmd, argp);
	break;
	};

	return ret;
	}

	static int vfc_mmap(struct file file, struct vm_area_struct vma)
	{
	unsigned int map_size, ret, map_offset;
	struct vfc_dev *dev;

	dev = vfc_get_dev_ptr(iminor(file->f_path.dentry->d_inode));
	if(dev == NULL)
	return -ENODEV;

	map_size = vma->vm_end - vma->vm_start;
	if(map_size > sizeof(struct vfc_regs))
	map_size = sizeof(struct vfc_regs);

	vma->vm_flags \|=
	(VM_MAYREAD \| VM_MAYWRITE \| VM_MAYSHARE);
	map_offset = (unsigned int) (long)dev->phys_regs;
	ret = io_remap_pfn_range(vma, vma->vm_start,
	MK_IOSPACE_PFN(dev->which_io,
	map_offset >> PAGE_SHIFT),
	map_size, vma->vm_page_prot);

	if(ret)
	return -EAGAIN;

	return 0;
	}


	static const struct file_operations vfc_fops = {
	.owner = THIS_MODULE,
	.llseek = no_llseek,
	.ioctl = vfc_ioctl,
	.mmap = vfc_mmap,
	.open = vfc_open,
	.release = vfc_release,
	};

	static int vfc_probe(void)
	{
	struct sbus_bus *sbus;
	struct sbus_dev *sdev = NULL;
	int ret;
	int instance = 0, cards = 0;

	for_all_sbusdev(sdev, sbus) {
	if (strcmp(sdev->prom_name, "vfc") == 0) {
	cards++;
	continue;
	}
	}

	if (!cards)
	return -ENODEV;

	vfc_dev_lst = kmalloc(sizeof(struct vfc_dev )
	(cards+1),
	GFP_KERNEL);
	if (vfc_dev_lst == NULL)
	return -ENOMEM;
	memset(vfc_dev_lst, 0, sizeof(struct vfc_dev ) (cards + 1));
	vfc_dev_lst[cards] = NULL;

	ret = register_chrdev(VFC_MAJOR, vfcstr, &vfc_fops);
	if(ret) {
	printk(KERN_ERR "Unable to get major number %d\n", VFC_MAJOR);
	kfree(vfc_dev_lst);
	return -EIO;
	}
	instance = 0;
	for_all_sbusdev(sdev, sbus) {
	if (strcmp(sdev->prom_name, "vfc") == 0) {
	vfc_dev_lst[instance]=(struct vfc_dev *)
	kmalloc(sizeof(struct vfc_dev), GFP_KERNEL);
	if (vfc_dev_lst[instance] == NULL)
	return -ENOMEM;
	ret = init_vfc_device(sdev,
	vfc_dev_lst[instance],
	instance);
	if(ret) {
	printk(KERN_ERR "Unable to initialize"
	" vfc%d device\n",
	instance);
	} else {
	}

	instance++;
	continue;
	}
	}

	return 0;
	}

	#ifdef MODULE
	int init_module(void)
	#else
	int vfc_init(void)
	#endif
	{
	return vfc_probe();
	}

	#ifdef MODULE
	static void deinit_vfc_device(struct vfc_dev *dev)
	{
	if(dev == NULL)
	return;
	sbus_iounmap(dev->regs, sizeof(struct vfc_regs));
	kfree(dev);
	}

	void cleanup_module(void)
	{
	struct vfc_dev **devp;

	unregister_chrdev(VFC_MAJOR,vfcstr);

	for (devp = vfc_dev_lst; *devp; devp++)
	deinit_vfc_device(*devp);

	kfree(vfc_dev_lst);
	return;
	}
	#endif

	MODULE_LICENSE("GPL");