text: /*
   * Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
   * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
   * Copyright 2009 Jonathan Corbet <corbet@lwn.net>
   */
  
  /*
   * Core code for the Via multifunction framebuffer device.
   */
  #include <linux/via-core.h>
  #include <linux/via_i2c.h>
  #include <linux/via-gpio.h>
  #include "global.h"
  
  #include <linux/module.h>
  #include <linux/interrupt.h>
  #include <linux/platform_device.h>
  
  /*
   * The default port config.
   */
  static struct via_port_cfg adap_configs[] = {
  	[VIA_PORT_26]	= { VIA_PORT_I2C,  VIA_MODE_OFF, VIASR, 0x26 },
  	[VIA_PORT_31]	= { VIA_PORT_I2C,  VIA_MODE_I2C, VIASR, 0x31 },
  	[VIA_PORT_25]	= { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x25 },
  	[VIA_PORT_2C]	= { VIA_PORT_GPIO, VIA_MODE_I2C, VIASR, 0x2c },
  	[VIA_PORT_3D]	= { VIA_PORT_GPIO, VIA_MODE_GPIO, VIASR, 0x3d },
  	{ 0, 0, 0, 0 }
  };
  
  /*
   * We currently only support one viafb device (will there ever be
   * more than one?), so just declare it globally here.
   */
  static struct viafb_dev global_dev;
  
  
  /*
   * Basic register access; spinlock required.
   */
  static inline void viafb_mmio_write(int reg, u32 v)
  {
  	iowrite32(v, global_dev.engine_mmio + reg);
  }
  
  static inline int viafb_mmio_read(int reg)
  {
  	return ioread32(global_dev.engine_mmio + reg);
  }
  
  /* ---------------------------------------------------------------------- */
  /*
   * Interrupt management.  We have a single IRQ line for a lot of
   * different functions, so we need to share it.  The design here
   * is that we don't want to reimplement the shared IRQ code here;
   * we also want to avoid having contention for a single handler thread.
   * So each subdev driver which needs interrupts just requests
   * them directly from the kernel.  We just have what's needed for
   * overall access to the interrupt control register.
   */
  
  /*
   * Which interrupts are enabled now?
   */
  static u32 viafb_enabled_ints;
  
  static void __devinit viafb_int_init(void)
  {
  	viafb_enabled_ints = 0;
  
  	viafb_mmio_write(VDE_INTERRUPT, 0);
  }
  
  /*
   * Allow subdevs to ask for specific interrupts to be enabled.  These
   * functions must be called with reg_lock held
   */
  void viafb_irq_enable(u32 mask)
  {
  	viafb_enabled_ints |= mask;
  	viafb_mmio_write(VDE_INTERRUPT, viafb_enabled_ints | VDE_I_ENABLE);
  }
  EXPORT_SYMBOL_GPL(viafb_irq_enable);
  
  void viafb_irq_disable(u32 mask)
  {
  	viafb_enabled_ints &= ~mask;
  	if (viafb_enabled_ints == 0)
  		viafb_mmio_write(VDE_INTERRUPT, 0);  /* Disable entirely */
  	else
  		viafb_mmio_write(VDE_INTERRUPT,
  				viafb_enabled_ints | VDE_I_ENABLE);
  }
  EXPORT_SYMBOL_GPL(viafb_irq_disable);
  
  /* ---------------------------------------------------------------------- */
  /*
   * Access to the DMA engine.  This currently provides what the camera
   * driver needs (i.e. outgoing only) but is easily expandable if need
   * be.
   */
  
  /*
   * There are four DMA channels in the vx855.  For now, we only
   * use one of them, though.  Most of the time, the DMA channel
   * will be idle, so we keep the IRQ handler unregistered except
   * when some subsystem has indicated an interest.
   */
  static int viafb_dma_users;
  static DECLARE_COMPLETION(viafb_dma_completion);
  /*
   * This mutex protects viafb_dma_users and our global interrupt
   * registration state; it also serializes access to the DMA
   * engine.
   */
  static DEFINE_MUTEX(viafb_dma_lock);
  
  /*
   * The VX855 DMA descriptor (used for s/g transfers) looks
   * like this.
   */
  struct viafb_vx855_dma_descr {
  	u32	addr_low;	/* Low part of phys addr */
  	u32	addr_high;	/* High 12 bits of addr */
  	u32	fb_offset;	/* Offset into FB memory */
  	u32	seg_size;	/* Size, 16-byte units */
  	u32	tile_mode;	/* "tile mode" setting */
  	u32	next_desc_low;	/* Next descriptor addr */
  	u32	next_desc_high;
  	u32	pad;		/* Fill out to 64 bytes */
  };
  
  /*
   * Flags added to the "next descriptor low" pointers
   */
  #define VIAFB_DMA_MAGIC		0x01  /* ??? Just has to be there */
  #define VIAFB_DMA_FINAL_SEGMENT 0x02  /* Final segment */
  
  /*
   * The completion IRQ handler.
   */
  static irqreturn_t viafb_dma_irq(int irq, void *data)
  {
  	int csr;
  	irqreturn_t ret = IRQ_NONE;
  
  	spin_lock(&global_dev.reg_lock);
  	csr = viafb_mmio_read(VDMA_CSR0);
  	if (csr & VDMA_C_DONE) {
  		viafb_mmio_write(VDMA_CSR0, VDMA_C_DONE);
  		complete(&viafb_dma_completion);
  		ret = IRQ_HANDLED;
  	}
  	spin_unlock(&global_dev.reg_lock);
  	return ret;
  }
  
  /*
   * Indicate a need for DMA functionality.
   */
  int viafb_request_dma(void)
  {
  	int ret = 0;
  
  	/*
  	 * Only VX855 is supported currently.
  	 */
  	if (global_dev.chip_type != UNICHROME_VX855)
  		return -ENODEV;
  	/*
  	 * Note the new user and set up our interrupt handler
  	 * if need be.
  	 */
  	mutex_lock(&viafb_dma_lock);
  	viafb_dma_users++;
  	if (viafb_dma_users == 1) {
  		ret = request_irq(global_dev.pdev->irq, viafb_dma_irq,
  				IRQF_SHARED, "via-dma", &viafb_dma_users);
  		if (ret)
  			viafb_dma_users--;
  		else
  			viafb_irq_enable(VDE_I_DMA0TDEN);
  	}
  	mutex_unlock(&viafb_dma_lock);
  	return ret;
  }
  EXPORT_SYMBOL_GPL(viafb_request_dma);
  
  void viafb_release_dma(void)
  {
  	mutex_lock(&viafb_dma_lock);
  	viafb_dma_users--;
  	if (viafb_dma_users == 0) {
  		viafb_irq_disable(VDE_I_DMA0TDEN);
  		free_irq(global_dev.pdev->irq, &viafb_dma_users);
  	}
  	mutex_unlock(&viafb_dma_lock);
  }
  EXPORT_SYMBOL_GPL(viafb_release_dma);
  
  
  #if 0
  /*
   * Copy a single buffer from FB memory, synchronously.  This code works
   * but is not currently used.
   */
  void viafb_dma_copy_out(unsigned int offset, dma_addr_t paddr, int len)
  {
  	unsigned long flags;
  	int csr;
  
  	mutex_lock(&viafb_dma_lock);
  	init_completion(&viafb_dma_completion);
  	/*
  	 * Program the controller.
  	 */
  	spin_lock_irqsave(&global_dev.reg_lock, flags);
  	viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_DONE);
  	/* Enable ints; must happen after CSR0 write! */
  	viafb_mmio_write(VDMA_MR0, VDMA_MR_TDIE);
  	viafb_mmio_write(VDMA_MARL0, (int) (paddr & 0xfffffff0));
  	viafb_mmio_write(VDMA_MARH0, (int) ((paddr >> 28) & 0xfff));
  	/* Data sheet suggests DAR0 should be <<4, but it lies */
  	viafb_mmio_write(VDMA_DAR0, offset);
  	viafb_mmio_write(VDMA_DQWCR0, len >> 4);
  	viafb_mmio_write(VDMA_TMR0, 0);
  	viafb_mmio_write(VDMA_DPRL0, 0);
  	viafb_mmio_write(VDMA_DPRH0, 0);
  	viafb_mmio_write(VDMA_PMR0, 0);
  	csr = viafb_mmio_read(VDMA_CSR0);
  	viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_START);
  	spin_unlock_irqrestore(&global_dev.reg_lock, flags);
  	/*
  	 * Now we just wait until the interrupt handler says
  	 * we're done.
  	 */
  	wait_for_completion_interruptible(&viafb_dma_completion);
  	viafb_mmio_write(VDMA_MR0, 0); /* Reset int enable */
  	mutex_unlock(&viafb_dma_lock);
  }
  EXPORT_SYMBOL_GPL(viafb_dma_copy_out);
  #endif
  
  /*
   * Do a scatter/gather DMA copy from FB memory.  You must have done
   * a successful call to viafb_request_dma() first.
   */
  int viafb_dma_copy_out_sg(unsigned int offset, struct scatterlist *sg, int nsg)
  {
  	struct viafb_vx855_dma_descr *descr;
  	void *descrpages;
  	dma_addr_t descr_handle;
  	unsigned long flags;
  	int i;
  	struct scatterlist *sgentry;
  	dma_addr_t nextdesc;
  
  	/*
  	 * Get a place to put the descriptors.
  	 */
  	descrpages = dma_alloc_coherent(&global_dev.pdev->dev,
  			nsg*sizeof(struct viafb_vx855_dma_descr),
  			&descr_handle, GFP_KERNEL);
  	if (descrpages == NULL) {
  		dev_err(&global_dev.pdev->dev, "Unable to get descr page.\n");
  		return -ENOMEM;
  	}
  	mutex_lock(&viafb_dma_lock);
  	/*
  	 * Fill them in.
  	 */
  	descr = descrpages;
  	nextdesc = descr_handle + sizeof(struct viafb_vx855_dma_descr);
  	for_each_sg(sg, sgentry, nsg, i) {
  		dma_addr_t paddr = sg_dma_address(sgentry);
  		descr->addr_low = paddr & 0xfffffff0;
  		descr->addr_high = ((u64) paddr >> 32) & 0x0fff;
  		descr->fb_offset = offset;
  		descr->seg_size = sg_dma_len(sgentry) >> 4;
  		descr->tile_mode = 0;
  		descr->next_desc_low = (nextdesc&0xfffffff0) | VIAFB_DMA_MAGIC;
  		descr->next_desc_high = ((u64) nextdesc >> 32) & 0x0fff;
  		descr->pad = 0xffffffff;  /* VIA driver does this */
  		offset += sg_dma_len(sgentry);
  		nextdesc += sizeof(struct viafb_vx855_dma_descr);
  		descr++;
  	}
  	descr[-1].next_desc_low = VIAFB_DMA_FINAL_SEGMENT|VIAFB_DMA_MAGIC;
  	/*
  	 * Program the engine.
  	 */
  	spin_lock_irqsave(&global_dev.reg_lock, flags);
  	init_completion(&viafb_dma_completion);
  	viafb_mmio_write(VDMA_DQWCR0, 0);
  	viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_DONE);
  	viafb_mmio_write(VDMA_MR0, VDMA_MR_TDIE | VDMA_MR_CHAIN);
  	viafb_mmio_write(VDMA_DPRL0, descr_handle | VIAFB_DMA_MAGIC);
  	viafb_mmio_write(VDMA_DPRH0,
  			(((u64)descr_handle >> 32) & 0x0fff) | 0xf0000);
  	(void) viafb_mmio_read(VDMA_CSR0);
  	viafb_mmio_write(VDMA_CSR0, VDMA_C_ENABLE|VDMA_C_START);
  	spin_unlock_irqrestore(&global_dev.reg_lock, flags);
  	/*
  	 * Now we just wait until the interrupt handler says
  	 * we're done.  Except that, actually, we need to wait a little
  	 * longer: the interrupts seem to jump the gun a little and we
  	 * get corrupted frames sometimes.
  	 */
  	wait_for_completion_timeout(&viafb_dma_completion, 1);
  	msleep(1);
  	if ((viafb_mmio_read(VDMA_CSR0)&VDMA_C_DONE) == 0)
  		printk(KERN_ERR "VIA DMA timeout!\n");
  	/*
  	 * Clean up and we're done.
  	 */
  	viafb_mmio_write(VDMA_CSR0, VDMA_C_DONE);
  	viafb_mmio_write(VDMA_MR0, 0); /* Reset int enable */
  	mutex_unlock(&viafb_dma_lock);
  	dma_free_coherent(&global_dev.pdev->dev,
  			nsg*sizeof(struct viafb_vx855_dma_descr), descrpages,
  			descr_handle);
  	return 0;
  }
  EXPORT_SYMBOL_GPL(viafb_dma_copy_out_sg);
  
  
  /* ---------------------------------------------------------------------- */
  /*
   * Figure out how big our framebuffer memory is.  Kind of ugly,
   * but evidently we can't trust the information found in the
   * fbdev configuration area.
   */
  static u16 via_function3[] = {
  	CLE266_FUNCTION3, KM400_FUNCTION3, CN400_FUNCTION3, CN700_FUNCTION3,
  	CX700_FUNCTION3, KM800_FUNCTION3, KM890_FUNCTION3, P4M890_FUNCTION3,
  	P4M900_FUNCTION3, VX800_FUNCTION3, VX855_FUNCTION3,
  };
  
  /* Get the BIOS-configured framebuffer size from PCI configuration space
   * of function 3 in the respective chipset */
  static int viafb_get_fb_size_from_pci(int chip_type)
  {
  	int i;
  	u8 offset = 0;
  	u32 FBSize;
  	u32 VideoMemSize;
  
  	/* search for the "FUNCTION3" device in this chipset */
  	for (i = 0; i < ARRAY_SIZE(via_function3); i++) {
  		struct pci_dev *pdev;
  
  		pdev = pci_get_device(PCI_VENDOR_ID_VIA, via_function3[i],
  				      NULL);
  		if (!pdev)
  			continue;
  
  		DEBUG_MSG(KERN_INFO "Device ID = %x\n", pdev->device);
  
  		switch (pdev->device) {
  		case CLE266_FUNCTION3:
  		case KM400_FUNCTION3:
  			offset = 0xE0;
  			break;
  		case CN400_FUNCTION3:
  		case CN700_FUNCTION3:
  		case CX700_FUNCTION3:
  		case KM800_FUNCTION3:
  		case KM890_FUNCTION3:
  		case P4M890_FUNCTION3:
  		case P4M900_FUNCTION3:
  		case VX800_FUNCTION3:
  		case VX855_FUNCTION3:
  		/*case CN750_FUNCTION3: */
  			offset = 0xA0;
  			break;
  		}
  
  		if (!offset)
  			break;
  
  		pci_read_config_dword(pdev, offset, &FBSize);
  		pci_dev_put(pdev);
  	}
  
  	if (!offset) {
  		printk(KERN_ERR "cannot determine framebuffer size\n");
  		return -EIO;
  	}
  
  	FBSize = FBSize & 0x00007000;
  	DEBUG_MSG(KERN_INFO "FB Size = %x\n", FBSize);
  
  	if (chip_type < UNICHROME_CX700) {
  		switch (FBSize) {
  		case 0x00004000:
  			VideoMemSize = (16 << 20);	/*16M */
  			break;
  
  		case 0x00005000:
  			VideoMemSize = (32 << 20);	/*32M */
  			break;
  
  		case 0x00006000:
  			VideoMemSize = (64 << 20);	/*64M */
  			break;
  
  		default:
  			VideoMemSize = (32 << 20);	/*32M */
  			break;
  		}
  	} else {
  		switch (FBSize) {
  		case 0x00001000:
  			VideoMemSize = (8 << 20);	/*8M */
  			break;
  
  		case 0x00002000:
  			VideoMemSize = (16 << 20);	/*16M */
  			break;
  
  		case 0x00003000:
  			VideoMemSize = (32 << 20);	/*32M */
  			break;
  
  		case 0x00004000:
  			VideoMemSize = (64 << 20);	/*64M */
  			break;
  
  		case 0x00005000:
  			VideoMemSize = (128 << 20);	/*128M */
  			break;
  
  		case 0x00006000:
  			VideoMemSize = (256 << 20);	/*256M */
  			break;
  
  		case 0x00007000:	/* Only on VX855/875 */
  			VideoMemSize = (512 << 20);	/*512M */
  			break;
  
  		default:
  			VideoMemSize = (32 << 20);	/*32M */
  			break;
  		}
  	}
  
  	return VideoMemSize;
  }
  
  
  /*
   * Figure out and map our MMIO regions.
   */
  static int __devinit via_pci_setup_mmio(struct viafb_dev *vdev)
  {
  	int ret;
  	/*
  	 * Hook up to the device registers.  Note that we soldier
  	 * on if it fails; the framebuffer can operate (without
  	 * acceleration) without this region.
  	 */
  	vdev->engine_start = pci_resource_start(vdev->pdev, 1);
  	vdev->engine_len = pci_resource_len(vdev->pdev, 1);
  	vdev->engine_mmio = ioremap_nocache(vdev->engine_start,
  			vdev->engine_len);
  	if (vdev->engine_mmio == NULL)
  		dev_err(&vdev->pdev->dev,
  				"Unable to map engine MMIO; operation will be "
  				"slow and crippled.\n");
  	/*
  	 * Map in framebuffer memory.  For now, failure here is
  	 * fatal.  Unfortunately, in the absence of significant
  	 * vmalloc space, failure here is also entirely plausible.
  	 * Eventually we want to move away from mapping this
  	 * entire region.
  	 */
  	vdev->fbmem_start = pci_resource_start(vdev->pdev, 0);
  	ret = vdev->fbmem_len = viafb_get_fb_size_from_pci(vdev->chip_type);
  	if (ret < 0)
  		goto out_unmap;
  	vdev->fbmem = ioremap_nocache(vdev->fbmem_start, vdev->fbmem_len);
  	if (vdev->fbmem == NULL) {
  		ret = -ENOMEM;
  		goto out_unmap;
  	}
  	return 0;
  out_unmap:
  	iounmap(vdev->engine_mmio);
  	return ret;
  }
  
  static void via_pci_teardown_mmio(struct viafb_dev *vdev)
  {
  	iounmap(vdev->fbmem);
  	iounmap(vdev->engine_mmio);
  }
  
  /*
   * Create our subsidiary devices.
   */
  static struct viafb_subdev_info {
  	char *name;
  	struct platform_device *platdev;
  } viafb_subdevs[] = {
  	{
  		.name = "viafb-gpio",
  	},
  	{
  		.name = "viafb-i2c",
  	}
  };
  #define N_SUBDEVS ARRAY_SIZE(viafb_subdevs)
  
  static int __devinit via_create_subdev(struct viafb_dev *vdev,
  		struct viafb_subdev_info *info)
  {
  	int ret;
  
  	info->platdev = platform_device_alloc(info->name, -1);
  	if (!info->platdev) {
  		dev_err(&vdev->pdev->dev, "Unable to allocate pdev %s\n",
  			info->name);
  		return -ENOMEM;
  	}
  	info->platdev->dev.parent = &vdev->pdev->dev;
  	info->platdev->dev.platform_data = vdev;
  	ret = platform_device_add(info->platdev);
  	if (ret) {
  		dev_err(&vdev->pdev->dev, "Unable to add pdev %s\n",
  				info->name);
  		platform_device_put(info->platdev);
  		info->platdev = NULL;
  	}
  	return ret;
  }
  
  static int __devinit via_setup_subdevs(struct viafb_dev *vdev)
  {
  	int i;
  
  	/*
  	 * Ignore return values.  Even if some of the devices
  	 * fail to be created, we'll still be able to use some
  	 * of the rest.
  	 */
  	for (i = 0; i < N_SUBDEVS; i++)
  		via_create_subdev(vdev, viafb_subdevs + i);
  	return 0;
  }
  
  static void via_teardown_subdevs(void)
  {
  	int i;
  
  	for (i = 0; i < N_SUBDEVS; i++)
  		if (viafb_subdevs[i].platdev) {
  			viafb_subdevs[i].platdev->dev.platform_data = NULL;
  			platform_device_unregister(viafb_subdevs[i].platdev);
  		}
  }
  
  
  static int __devinit via_pci_probe(struct pci_dev *pdev,
  		const struct pci_device_id *ent)
  {
  	int ret;
  
  	ret = pci_enable_device(pdev);
  	if (ret)
  		return ret;
  	/*
  	 * Global device initialization.
  	 */
  	memset(&global_dev, 0, sizeof(global_dev));
  	global_dev.pdev = pdev;
  	global_dev.chip_type = ent->driver_data;
  	global_dev.port_cfg = adap_configs;
  	spin_lock_init(&global_dev.reg_lock);
  	ret = via_pci_setup_mmio(&global_dev);
  	if (ret)
  		goto out_disable;
  	/*
  	 * Set up interrupts and create our subdevices.  Continue even if
  	 * some things fail.
  	 */
  	viafb_int_init();
  	via_setup_subdevs(&global_dev);
  	/*
  	 * Set up the framebuffer device
  	 */
  	ret = via_fb_pci_probe(&global_dev);
  	if (ret)
  		goto out_subdevs;
  	return 0;
  
  out_subdevs:
  	via_teardown_subdevs();
  	via_pci_teardown_mmio(&global_dev);
  out_disable:
  	pci_disable_device(pdev);
  	return ret;
  }
  
  static void __devexit via_pci_remove(struct pci_dev *pdev)
  {
  	via_teardown_subdevs();
  	via_fb_pci_remove(pdev);
  	via_pci_teardown_mmio(&global_dev);
  	pci_disable_device(pdev);
  }
  
  
  static struct pci_device_id via_pci_table[] __devinitdata = {
  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CLE266_DID),
  	  .driver_data = UNICHROME_CLE266 },
  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K400_DID),
  	  .driver_data = UNICHROME_K400 },
  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K800_DID),
  	  .driver_data = UNICHROME_K800 },
  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_PM800_DID),
  	  .driver_data = UNICHROME_PM800 },
  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CN700_DID),
  	  .driver_data = UNICHROME_CN700 },
  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CX700_DID),
  	  .driver_data = UNICHROME_CX700 },
  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_CN750_DID),
  	  .driver_data = UNICHROME_CN750 },
  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_K8M890_DID),
  	  .driver_data = UNICHROME_K8M890 },
  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_P4M890_DID),
  	  .driver_data = UNICHROME_P4M890 },
  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_P4M900_DID),
  	  .driver_data = UNICHROME_P4M900 },
  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX800_DID),
  	  .driver_data = UNICHROME_VX800 },
  	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, UNICHROME_VX855_DID),
  	  .driver_data = UNICHROME_VX855 },
  	{ }
  };
  MODULE_DEVICE_TABLE(pci, via_pci_table);
  
  static struct pci_driver via_driver = {
  	.name		= "viafb",
  	.id_table	= via_pci_table,
  	.probe		= via_pci_probe,
  	.remove		= __devexit_p(via_pci_remove),
  };
  
  static int __init via_core_init(void)
  {
  	int ret;
  
  	ret = viafb_init();
  	if (ret)
  		return ret;
  	viafb_i2c_init();
  	viafb_gpio_init();
  	return pci_register_driver(&via_driver);
  }
  
  static void __exit via_core_exit(void)
  {
  	pci_unregister_driver(&via_driver);
  	viafb_gpio_exit();
  	viafb_i2c_exit();
  	viafb_exit();
  }
  
  module_init(via_core_init);
  module_exit(via_core_exit);
  