text: /*
   *  Driver for the Conexant CX23885/7/8 PCIe bridge
   *
   *  Various common ioctl() support functions
   *
   *  Copyright (c) 2009 Andy Walls <awalls@md.metrocast.net>
   *
   *  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; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to the Free Software
   *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  #include "cx23885.h"
  #include <media/v4l2-chip-ident.h>
  
  int cx23885_g_chip_ident(struct file *file, void *fh,
  			 struct v4l2_dbg_chip_ident *chip)
  {
  	struct cx23885_dev *dev = ((struct cx23885_fh *)fh)->dev;
  	int err = 0;
  	u8 rev;
  
  	chip->ident = V4L2_IDENT_NONE;
  	chip->revision = 0;
  	switch (chip->match.type) {
  	case V4L2_CHIP_MATCH_HOST:
  		switch (chip->match.addr) {
  		case 0:
  			rev = cx_read(RDR_CFG2) & 0xff;
  			switch (dev->pci->device) {
  			case 0x8852:
  				/* rev 0x04 could be '885 or '888. Pick '888. */
  				if (rev == 0x04)
  					chip->ident = V4L2_IDENT_CX23888;
  				else
  					chip->ident = V4L2_IDENT_CX23885;
  				break;
  			case 0x8880:
  				if (rev == 0x0e || rev == 0x0f)
  					chip->ident = V4L2_IDENT_CX23887;
  				else
  					chip->ident = V4L2_IDENT_CX23888;
  				break;
  			default:
  				chip->ident = V4L2_IDENT_UNKNOWN;
  				break;
  			}
  			chip->revision = (dev->pci->device << 16) | (rev << 8) |
  					 (dev->hwrevision & 0xff);
  			break;
  		case 1:
  			if (dev->v4l_device != NULL) {
  				chip->ident = V4L2_IDENT_CX23417;
  				chip->revision = 0;
  			}
  			break;
  		case 2:
  			/*
  			 * The integrated IR controller on the CX23888 is
  			 * host chip 2.  It may not be used/initialized or sd_ir
  			 * may be pointing at the cx25840 subdevice for the
  			 * IR controller on the CX23885.  Thus we find it
  			 * without using the dev->sd_ir pointer.
  			 */
  			call_hw(dev, CX23885_HW_888_IR, core, g_chip_ident,
  				chip);
  			break;
  		default:
  			err = -EINVAL; /* per V4L2 spec */
  			break;
  		}
  		break;
  	case V4L2_CHIP_MATCH_I2C_DRIVER:
  		/* If needed, returns V4L2_IDENT_AMBIGUOUS without extra work */
  		call_all(dev, core, g_chip_ident, chip);
  		break;
  	case V4L2_CHIP_MATCH_I2C_ADDR:
  		/*
  		 * We could return V4L2_IDENT_UNKNOWN, but we don't do the work
  		 * to look if a chip is at the address with no driver.  That's a
  		 * dangerous thing to do with EEPROMs anyway.
  		 */
  		call_all(dev, core, g_chip_ident, chip);
  		break;
  	default:
  		err = -EINVAL;
  		break;
  	}
  	return err;
  }
  
  #ifdef CONFIG_VIDEO_ADV_DEBUG
  static int cx23885_g_host_register(struct cx23885_dev *dev,
  				   struct v4l2_dbg_register *reg)
  {
  	if ((reg->reg & 0x3) != 0 || reg->reg >= pci_resource_len(dev->pci, 0))
  		return -EINVAL;
  
  	reg->size = 4;
  	reg->val = cx_read(reg->reg);
  	return 0;
  }
  
  static int cx23417_g_register(struct cx23885_dev *dev,
  			      struct v4l2_dbg_register *reg)
  {
  	u32 value;
  
  	if (dev->v4l_device == NULL)
  		return -EINVAL;
  
  	if ((reg->reg & 0x3) != 0 || reg->reg >= 0x10000)
  		return -EINVAL;
  
  	if (mc417_register_read(dev, (u16) reg->reg, &value))
  		return -EINVAL; /* V4L2 spec, but -EREMOTEIO really */
  
  	reg->size = 4;
  	reg->val = value;
  	return 0;
  }
  
  int cx23885_g_register(struct file *file, void *fh,
  		       struct v4l2_dbg_register *reg)
  {
  	struct cx23885_dev *dev = ((struct cx23885_fh *)fh)->dev;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  
  	if (reg->match.type == V4L2_CHIP_MATCH_HOST) {
  		switch (reg->match.addr) {
  		case 0:
  			return cx23885_g_host_register(dev, reg);
  		case 1:
  			return cx23417_g_register(dev, reg);
  		default:
  			break;
  		}
  	}
  
  	/* FIXME - any error returns should not be ignored */
  	call_all(dev, core, g_register, reg);
  	return 0;
  }
  
  static int cx23885_s_host_register(struct cx23885_dev *dev,
  				   struct v4l2_dbg_register *reg)
  {
  	if ((reg->reg & 0x3) != 0 || reg->reg >= pci_resource_len(dev->pci, 0))
  		return -EINVAL;
  
  	reg->size = 4;
  	cx_write(reg->reg, reg->val);
  	return 0;
  }
  
  static int cx23417_s_register(struct cx23885_dev *dev,
  			      struct v4l2_dbg_register *reg)
  {
  	if (dev->v4l_device == NULL)
  		return -EINVAL;
  
  	if ((reg->reg & 0x3) != 0 || reg->reg >= 0x10000)
  		return -EINVAL;
  
  	if (mc417_register_write(dev, (u16) reg->reg, (u32) reg->val))
  		return -EINVAL; /* V4L2 spec, but -EREMOTEIO really */
  
  	reg->size = 4;
  	return 0;
  }
  
  int cx23885_s_register(struct file *file, void *fh,
  		       struct v4l2_dbg_register *reg)
  {
  	struct cx23885_dev *dev = ((struct cx23885_fh *)fh)->dev;
  
  	if (!capable(CAP_SYS_ADMIN))
  		return -EPERM;
  
  	if (reg->match.type == V4L2_CHIP_MATCH_HOST) {
  		switch (reg->match.addr) {
  		case 0:
  			return cx23885_s_host_register(dev, reg);
  		case 1:
  			return cx23417_s_register(dev, reg);
  		default:
  			break;
  		}
  	}
  
  	/* FIXME - any error returns should not be ignored */
  	call_all(dev, core, s_register, reg);
  	return 0;
  }
  #endif
  