cx23885-ioctl.c

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/*
 *  Driver for the Conexant CX23885/7/8 PCIe bridge
 *
 *  Various common ioctl() support functions
 *
 *  Copyright (c) 2009 Andy Walls <[email protected]>
 *
 *  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