cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cx23885-ioctl.c (2253B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Driver for the Conexant CX23885/7/8 PCIe bridge
      4 *
      5 *  Various common ioctl() support functions
      6 *
      7 *  Copyright (c) 2009 Andy Walls <awalls@md.metrocast.net>
      8 */
      9
     10#include "cx23885.h"
     11#include "cx23885-ioctl.h"
     12
     13#ifdef CONFIG_VIDEO_ADV_DEBUG
     14int cx23885_g_chip_info(struct file *file, void *fh,
     15			 struct v4l2_dbg_chip_info *chip)
     16{
     17	struct cx23885_dev *dev = video_drvdata(file);
     18
     19	if (chip->match.addr > 1)
     20		return -EINVAL;
     21	if (chip->match.addr == 1) {
     22		if (dev->v4l_device == NULL)
     23			return -EINVAL;
     24		strscpy(chip->name, "cx23417", sizeof(chip->name));
     25	} else {
     26		strscpy(chip->name, dev->v4l2_dev.name, sizeof(chip->name));
     27	}
     28	return 0;
     29}
     30
     31static int cx23417_g_register(struct cx23885_dev *dev,
     32			      struct v4l2_dbg_register *reg)
     33{
     34	u32 value;
     35
     36	if (dev->v4l_device == NULL)
     37		return -EINVAL;
     38
     39	if ((reg->reg & 0x3) != 0 || reg->reg >= 0x10000)
     40		return -EINVAL;
     41
     42	if (mc417_register_read(dev, (u16) reg->reg, &value))
     43		return -EINVAL; /* V4L2 spec, but -EREMOTEIO really */
     44
     45	reg->size = 4;
     46	reg->val = value;
     47	return 0;
     48}
     49
     50int cx23885_g_register(struct file *file, void *fh,
     51		       struct v4l2_dbg_register *reg)
     52{
     53	struct cx23885_dev *dev = video_drvdata(file);
     54
     55	if (reg->match.addr > 1)
     56		return -EINVAL;
     57	if (reg->match.addr)
     58		return cx23417_g_register(dev, reg);
     59
     60	if ((reg->reg & 0x3) != 0 || reg->reg >= pci_resource_len(dev->pci, 0))
     61		return -EINVAL;
     62
     63	reg->size = 4;
     64	reg->val = cx_read(reg->reg);
     65	return 0;
     66}
     67
     68static int cx23417_s_register(struct cx23885_dev *dev,
     69			      const struct v4l2_dbg_register *reg)
     70{
     71	if (dev->v4l_device == NULL)
     72		return -EINVAL;
     73
     74	if ((reg->reg & 0x3) != 0 || reg->reg >= 0x10000)
     75		return -EINVAL;
     76
     77	if (mc417_register_write(dev, (u16) reg->reg, (u32) reg->val))
     78		return -EINVAL; /* V4L2 spec, but -EREMOTEIO really */
     79	return 0;
     80}
     81
     82int cx23885_s_register(struct file *file, void *fh,
     83		       const struct v4l2_dbg_register *reg)
     84{
     85	struct cx23885_dev *dev = video_drvdata(file);
     86
     87	if (reg->match.addr > 1)
     88		return -EINVAL;
     89	if (reg->match.addr)
     90		return cx23417_s_register(dev, reg);
     91
     92	if ((reg->reg & 0x3) != 0 || reg->reg >= pci_resource_len(dev->pci, 0))
     93		return -EINVAL;
     94
     95	cx_write(reg->reg, reg->val);
     96	return 0;
     97}
     98#endif