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cx25840-core.c

/* cx25840 - Conexant CX25840 audio/video decoder driver
 *
 * Copyright (C) 2004 Ulf Eklund
 *
 * Based on the saa7115 driver and on the first verison of Chris Kennedy's
 * cx25840 driver.
 *
 * Changes by Tyler Trafford <tatrafford@comcast.net>
 *    - cleanup/rewrite for V4L2 API (2005)
 *
 * VBI support by Hans Verkuil <hverkuil@xs4all.nl>.
 *
 * NTSC sliced VBI support by Christopher Neufeld <television@cneufeld.ca>
 * with additional fixes by Hans Verkuil <hverkuil@xs4all.nl>.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <media/v4l2-common.h>
#include <media/v4l2-chip-ident.h>
#include <media/cx25840.h>

#include "cx25840-core.h"

MODULE_DESCRIPTION("Conexant CX25840 audio/video decoder driver");
MODULE_AUTHOR("Ulf Eklund, Chris Kennedy, Hans Verkuil, Tyler Trafford");
MODULE_LICENSE("GPL");

static unsigned short normal_i2c[] = { 0x88 >> 1, I2C_CLIENT_END };


int cx25840_debug;

module_param_named(debug,cx25840_debug, int, 0644);

MODULE_PARM_DESC(debug, "Debugging messages [0=Off (default) 1=On]");

I2C_CLIENT_INSMOD;

/* ----------------------------------------------------------------------- */

int cx25840_write(struct i2c_client *client, u16 addr, u8 value)
{
      u8 buffer[3];
      buffer[0] = addr >> 8;
      buffer[1] = addr & 0xff;
      buffer[2] = value;
      return i2c_master_send(client, buffer, 3);
}

int cx25840_write4(struct i2c_client *client, u16 addr, u32 value)
{
      u8 buffer[6];
      buffer[0] = addr >> 8;
      buffer[1] = addr & 0xff;
      buffer[2] = value >> 24;
      buffer[3] = (value >> 16) & 0xff;
      buffer[4] = (value >> 8) & 0xff;
      buffer[5] = value & 0xff;
      return i2c_master_send(client, buffer, 6);
}

u8 cx25840_read(struct i2c_client * client, u16 addr)
{
      u8 buffer[2];
      buffer[0] = addr >> 8;
      buffer[1] = addr & 0xff;

      if (i2c_master_send(client, buffer, 2) < 2)
            return 0;

      if (i2c_master_recv(client, buffer, 1) < 1)
            return 0;

      return buffer[0];
}

u32 cx25840_read4(struct i2c_client * client, u16 addr)
{
      u8 buffer[4];
      buffer[0] = addr >> 8;
      buffer[1] = addr & 0xff;

      if (i2c_master_send(client, buffer, 2) < 2)
            return 0;

      if (i2c_master_recv(client, buffer, 4) < 4)
            return 0;

      return (buffer[3] << 24) | (buffer[2] << 16) |
          (buffer[1] << 8) | buffer[0];
}

int cx25840_and_or(struct i2c_client *client, u16 addr, unsigned and_mask,
               u8 or_value)
{
      return cx25840_write(client, addr,
                       (cx25840_read(client, addr) & and_mask) |
                       or_value);
}

/* ----------------------------------------------------------------------- */

static int set_input(struct i2c_client *client, enum cx25840_video_input vid_input,
                                    enum cx25840_audio_input aud_input);
static void log_audio_status(struct i2c_client *client);
static void log_video_status(struct i2c_client *client);

/* ----------------------------------------------------------------------- */

static void init_dll1(struct i2c_client *client)
{
      /* This is the Hauppauge sequence used to
       * initialize the Delay Lock Loop 1 (ADC DLL). */
      cx25840_write(client, 0x159, 0x23);
      cx25840_write(client, 0x15a, 0x87);
      cx25840_write(client, 0x15b, 0x06);
      udelay(10);
      cx25840_write(client, 0x159, 0xe1);
      udelay(10);
      cx25840_write(client, 0x15a, 0x86);
      cx25840_write(client, 0x159, 0xe0);
      cx25840_write(client, 0x159, 0xe1);
      cx25840_write(client, 0x15b, 0x10);
}

static void init_dll2(struct i2c_client *client)
{
      /* This is the Hauppauge sequence used to
       * initialize the Delay Lock Loop 2 (ADC DLL). */
      cx25840_write(client, 0x15d, 0xe3);
      cx25840_write(client, 0x15e, 0x86);
      cx25840_write(client, 0x15f, 0x06);
      udelay(10);
      cx25840_write(client, 0x15d, 0xe1);
      cx25840_write(client, 0x15d, 0xe0);
      cx25840_write(client, 0x15d, 0xe1);
}

static void cx25836_initialize(struct i2c_client *client)
{
      /* reset configuration is described on page 3-77 of the CX25836 datasheet */
      /* 2. */
      cx25840_and_or(client, 0x000, ~0x01, 0x01);
      cx25840_and_or(client, 0x000, ~0x01, 0x00);
      /* 3a. */
      cx25840_and_or(client, 0x15a, ~0x70, 0x00);
      /* 3b. */
      cx25840_and_or(client, 0x15b, ~0x1e, 0x06);
      /* 3c. */
      cx25840_and_or(client, 0x159, ~0x02, 0x02);
      /* 3d. */
      udelay(10);
      /* 3e. */
      cx25840_and_or(client, 0x159, ~0x02, 0x00);
      /* 3f. */
      cx25840_and_or(client, 0x159, ~0xc0, 0xc0);
      /* 3g. */
      cx25840_and_or(client, 0x159, ~0x01, 0x00);
      cx25840_and_or(client, 0x159, ~0x01, 0x01);
      /* 3h. */
      cx25840_and_or(client, 0x15b, ~0x1e, 0x10);
}

static void cx25840_work_handler(struct work_struct *work)
{
      struct cx25840_state *state = container_of(work, struct cx25840_state, fw_work);
      cx25840_loadfw(state->c);
      wake_up(&state->fw_wait);
}

static void cx25840_initialize(struct i2c_client *client)
{
      DEFINE_WAIT(wait);
      struct cx25840_state *state = i2c_get_clientdata(client);
      struct workqueue_struct *q;

      /* datasheet startup in numbered steps, refer to page 3-77 */
      /* 2. */
      cx25840_and_or(client, 0x803, ~0x10, 0x00);
      /* The default of this register should be 4, but I get 0 instead.
       * Set this register to 4 manually. */
      cx25840_write(client, 0x000, 0x04);
      /* 3. */
      init_dll1(client);
      init_dll2(client);
      cx25840_write(client, 0x136, 0x0a);
      /* 4. */
      cx25840_write(client, 0x13c, 0x01);
      cx25840_write(client, 0x13c, 0x00);
      /* 5. */
      /* Do the firmware load in a work handler to prevent.
         Otherwise the kernel is blocked waiting for the
         bit-banging i2c interface to finish uploading the
         firmware. */
      INIT_WORK(&state->fw_work, cx25840_work_handler);
      init_waitqueue_head(&state->fw_wait);
      q = create_singlethread_workqueue("cx25840_fw");
      prepare_to_wait(&state->fw_wait, &wait, TASK_UNINTERRUPTIBLE);
      queue_work(q, &state->fw_work);
      schedule();
      finish_wait(&state->fw_wait, &wait);
      destroy_workqueue(q);

      /* 6. */
      cx25840_write(client, 0x115, 0x8c);
      cx25840_write(client, 0x116, 0x07);
      cx25840_write(client, 0x118, 0x02);
      /* 7. */
      cx25840_write(client, 0x4a5, 0x80);
      cx25840_write(client, 0x4a5, 0x00);
      cx25840_write(client, 0x402, 0x00);
      /* 8. */
      cx25840_and_or(client, 0x401, ~0x18, 0);
      cx25840_and_or(client, 0x4a2, ~0x10, 0x10);
      /* steps 8c and 8d are done in change_input() */
      /* 10. */
      cx25840_write(client, 0x8d3, 0x1f);
      cx25840_write(client, 0x8e3, 0x03);

      cx25840_vbi_setup(client);

      /* trial and error says these are needed to get audio */
      cx25840_write(client, 0x914, 0xa0);
      cx25840_write(client, 0x918, 0xa0);
      cx25840_write(client, 0x919, 0x01);

      /* stereo prefered */
      cx25840_write(client, 0x809, 0x04);
      /* AC97 shift */
      cx25840_write(client, 0x8cf, 0x0f);

      /* (re)set input */
      set_input(client, state->vid_input, state->aud_input);

      /* start microcontroller */
      cx25840_and_or(client, 0x803, ~0x10, 0x10);
}

/* ----------------------------------------------------------------------- */

static void input_change(struct i2c_client *client)
{
      struct cx25840_state *state = i2c_get_clientdata(client);
      v4l2_std_id std = cx25840_get_v4lstd(client);

      /* Follow step 8c and 8d of section 3.16 in the cx25840 datasheet */
      if (std & V4L2_STD_SECAM) {
            cx25840_write(client, 0x402, 0);
      }
      else {
            cx25840_write(client, 0x402, 0x04);
            cx25840_write(client, 0x49f, (std & V4L2_STD_NTSC) ? 0x14 : 0x11);
      }
      cx25840_and_or(client, 0x401, ~0x60, 0);
      cx25840_and_or(client, 0x401, ~0x60, 0x60);
      cx25840_and_or(client, 0x810, ~0x01, 1);

      if (state->radio) {
            cx25840_write(client, 0x808, 0xf9);
            cx25840_write(client, 0x80b, 0x00);
      }
      else if (std & V4L2_STD_525_60) {
            /* Certain Hauppauge PVR150 models have a hardware bug
               that causes audio to drop out. For these models the
               audio standard must be set explicitly.
               To be precise: it affects cards with tuner models
               85, 99 and 112 (model numbers from tveeprom). */
            int hw_fix = state->pvr150_workaround;

            if (std == V4L2_STD_NTSC_M_JP) {
                  /* Japan uses EIAJ audio standard */
                  cx25840_write(client, 0x808, hw_fix ? 0x2f : 0xf7);
            } else if (std == V4L2_STD_NTSC_M_KR) {
                  /* South Korea uses A2 audio standard */
                  cx25840_write(client, 0x808, hw_fix ? 0x3f : 0xf8);
            } else {
                  /* Others use the BTSC audio standard */
                  cx25840_write(client, 0x808, hw_fix ? 0x1f : 0xf6);
            }
            cx25840_write(client, 0x80b, 0x00);
      } else if (std & V4L2_STD_PAL) {
            /* Follow tuner change procedure for PAL */
            cx25840_write(client, 0x808, 0xff);
            cx25840_write(client, 0x80b, 0x10);
      } else if (std & V4L2_STD_SECAM) {
            /* Select autodetect for SECAM */
            cx25840_write(client, 0x808, 0xff);
            cx25840_write(client, 0x80b, 0x10);
      }

      cx25840_and_or(client, 0x810, ~0x01, 0);
}

static int set_input(struct i2c_client *client, enum cx25840_video_input vid_input,
                                    enum cx25840_audio_input aud_input)
{
      struct cx25840_state *state = i2c_get_clientdata(client);
      u8 is_composite = (vid_input >= CX25840_COMPOSITE1 &&
                     vid_input <= CX25840_COMPOSITE8);
      u8 reg;

      v4l_dbg(1, cx25840_debug, client, "decoder set video input %d, audio input %d\n",
                  vid_input, aud_input);

      if (is_composite) {
            reg = 0xf0 + (vid_input - CX25840_COMPOSITE1);
      } else {
            int luma = vid_input & 0xf0;
            int chroma = vid_input & 0xf00;

            if ((vid_input & ~0xff0) ||
                luma < CX25840_SVIDEO_LUMA1 || luma > CX25840_SVIDEO_LUMA4 ||
                chroma < CX25840_SVIDEO_CHROMA4 || chroma > CX25840_SVIDEO_CHROMA8) {
                  v4l_err(client, "0x%04x is not a valid video input!\n", vid_input);
                  return -EINVAL;
            }
            reg = 0xf0 + ((luma - CX25840_SVIDEO_LUMA1) >> 4);
            if (chroma >= CX25840_SVIDEO_CHROMA7) {
                  reg &= 0x3f;
                  reg |= (chroma - CX25840_SVIDEO_CHROMA7) >> 2;
            } else {
                  reg &= 0xcf;
                  reg |= (chroma - CX25840_SVIDEO_CHROMA4) >> 4;
            }
      }

      switch (aud_input) {
      case CX25840_AUDIO_SERIAL:
            /* do nothing, use serial audio input */
            break;
      case CX25840_AUDIO4: reg &= ~0x30; break;
      case CX25840_AUDIO5: reg &= ~0x30; reg |= 0x10; break;
      case CX25840_AUDIO6: reg &= ~0x30; reg |= 0x20; break;
      case CX25840_AUDIO7: reg &= ~0xc0; break;
      case CX25840_AUDIO8: reg &= ~0xc0; reg |= 0x40; break;

      default:
            v4l_err(client, "0x%04x is not a valid audio input!\n", aud_input);
            return -EINVAL;
      }

      cx25840_write(client, 0x103, reg);
      /* Set INPUT_MODE to Composite (0) or S-Video (1) */
      cx25840_and_or(client, 0x401, ~0x6, is_composite ? 0 : 0x02);
      /* Set CH_SEL_ADC2 to 1 if input comes from CH3 */
      cx25840_and_or(client, 0x102, ~0x2, (reg & 0x80) == 0 ? 2 : 0);
      /* Set DUAL_MODE_ADC2 to 1 if input comes from both CH2 and CH3 */
      if ((reg & 0xc0) != 0xc0 && (reg & 0x30) != 0x30)
            cx25840_and_or(client, 0x102, ~0x4, 4);
      else
            cx25840_and_or(client, 0x102, ~0x4, 0);

      state->vid_input = vid_input;
      state->aud_input = aud_input;
      if (!state->is_cx25836) {
            cx25840_audio_set_path(client);
            input_change(client);
      }
      return 0;
}

/* ----------------------------------------------------------------------- */

static int set_v4lstd(struct i2c_client *client, v4l2_std_id std)
{
      u8 fmt=0;   /* zero is autodetect */

      /* First tests should be against specific std */
      if (std == V4L2_STD_NTSC_M_JP) {
            fmt=0x2;
      } else if (std == V4L2_STD_NTSC_443) {
            fmt=0x3;
      } else if (std == V4L2_STD_PAL_M) {
            fmt=0x5;
      } else if (std == V4L2_STD_PAL_N) {
            fmt=0x6;
      } else if (std == V4L2_STD_PAL_Nc) {
            fmt=0x7;
      } else if (std == V4L2_STD_PAL_60) {
            fmt=0x8;
      } else {
            /* Then, test against generic ones */
            if (std & V4L2_STD_NTSC) {
                  fmt=0x1;
            } else if (std & V4L2_STD_PAL) {
                  fmt=0x4;
            } else if (std & V4L2_STD_SECAM) {
                  fmt=0xc;
            }
      }

      v4l_dbg(1, cx25840_debug, client, "changing video std to fmt %i\n",fmt);

      /* Follow step 9 of section 3.16 in the cx25840 datasheet.
         Without this PAL may display a vertical ghosting effect.
         This happens for example with the Yuan MPC622. */
      if (fmt >= 4 && fmt < 8) {
            /* Set format to NTSC-M */
            cx25840_and_or(client, 0x400, ~0xf, 1);
            /* Turn off LCOMB */
            cx25840_and_or(client, 0x47b, ~6, 0);
      }
      cx25840_and_or(client, 0x400, ~0xf, fmt);
      cx25840_vbi_setup(client);
      return 0;
}

v4l2_std_id cx25840_get_v4lstd(struct i2c_client * client)
{
      struct cx25840_state *state = i2c_get_clientdata(client);
      /* check VID_FMT_SEL first */
      u8 fmt = cx25840_read(client, 0x400) & 0xf;

      if (!fmt) {
            /* check AFD_FMT_STAT if set to autodetect */
            fmt = cx25840_read(client, 0x40d) & 0xf;
      }

      switch (fmt) {
      case 0x1:
      {
            /* if the audio std is A2-M, then this is the South Korean
               NTSC standard */
            if (!state->is_cx25836 && cx25840_read(client, 0x805) == 2)
                  return V4L2_STD_NTSC_M_KR;
            return V4L2_STD_NTSC_M;
      }
      case 0x2: return V4L2_STD_NTSC_M_JP;
      case 0x3: return V4L2_STD_NTSC_443;
      case 0x4: return V4L2_STD_PAL;
      case 0x5: return V4L2_STD_PAL_M;
      case 0x6: return V4L2_STD_PAL_N;
      case 0x7: return V4L2_STD_PAL_Nc;
      case 0x8: return V4L2_STD_PAL_60;
      case 0xc: return V4L2_STD_SECAM;
      default: return V4L2_STD_UNKNOWN;
      }
}

/* ----------------------------------------------------------------------- */

static int set_v4lctrl(struct i2c_client *client, struct v4l2_control *ctrl)
{
      struct cx25840_state *state = i2c_get_clientdata(client);

      switch (ctrl->id) {
      case CX25840_CID_ENABLE_PVR150_WORKAROUND:
            state->pvr150_workaround = ctrl->value;
            set_input(client, state->vid_input, state->aud_input);
            break;

      case V4L2_CID_BRIGHTNESS:
            if (ctrl->value < 0 || ctrl->value > 255) {
                  v4l_err(client, "invalid brightness setting %d\n",
                            ctrl->value);
                  return -ERANGE;
            }

            cx25840_write(client, 0x414, ctrl->value - 128);
            break;

      case V4L2_CID_CONTRAST:
            if (ctrl->value < 0 || ctrl->value > 127) {
                  v4l_err(client, "invalid contrast setting %d\n",
                            ctrl->value);
                  return -ERANGE;
            }

            cx25840_write(client, 0x415, ctrl->value << 1);
            break;

      case V4L2_CID_SATURATION:
            if (ctrl->value < 0 || ctrl->value > 127) {
                  v4l_err(client, "invalid saturation setting %d\n",
                            ctrl->value);
                  return -ERANGE;
            }

            cx25840_write(client, 0x420, ctrl->value << 1);
            cx25840_write(client, 0x421, ctrl->value << 1);
            break;

      case V4L2_CID_HUE:
            if (ctrl->value < -127 || ctrl->value > 127) {
                  v4l_err(client, "invalid hue setting %d\n", ctrl->value);
                  return -ERANGE;
            }

            cx25840_write(client, 0x422, ctrl->value);
            break;

      case V4L2_CID_AUDIO_VOLUME:
      case V4L2_CID_AUDIO_BASS:
      case V4L2_CID_AUDIO_TREBLE:
      case V4L2_CID_AUDIO_BALANCE:
      case V4L2_CID_AUDIO_MUTE:
            if (state->is_cx25836)
                  return -EINVAL;
            return cx25840_audio(client, VIDIOC_S_CTRL, ctrl);

      default:
            return -EINVAL;
      }

      return 0;
}

static int get_v4lctrl(struct i2c_client *client, struct v4l2_control *ctrl)
{
      struct cx25840_state *state = i2c_get_clientdata(client);

      switch (ctrl->id) {
      case CX25840_CID_ENABLE_PVR150_WORKAROUND:
            ctrl->value = state->pvr150_workaround;
            break;
      case V4L2_CID_BRIGHTNESS:
            ctrl->value = (s8)cx25840_read(client, 0x414) + 128;
            break;
      case V4L2_CID_CONTRAST:
            ctrl->value = cx25840_read(client, 0x415) >> 1;
            break;
      case V4L2_CID_SATURATION:
            ctrl->value = cx25840_read(client, 0x420) >> 1;
            break;
      case V4L2_CID_HUE:
            ctrl->value = (s8)cx25840_read(client, 0x422);
            break;
      case V4L2_CID_AUDIO_VOLUME:
      case V4L2_CID_AUDIO_BASS:
      case V4L2_CID_AUDIO_TREBLE:
      case V4L2_CID_AUDIO_BALANCE:
      case V4L2_CID_AUDIO_MUTE:
            if (state->is_cx25836)
                  return -EINVAL;
            return cx25840_audio(client, VIDIOC_G_CTRL, ctrl);
      default:
            return -EINVAL;
      }

      return 0;
}

/* ----------------------------------------------------------------------- */

static int get_v4lfmt(struct i2c_client *client, struct v4l2_format *fmt)
{
      switch (fmt->type) {
      case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
            return cx25840_vbi(client, VIDIOC_G_FMT, fmt);
      default:
            return -EINVAL;
      }

      return 0;
}

static int set_v4lfmt(struct i2c_client *client, struct v4l2_format *fmt)
{
      struct v4l2_pix_format *pix;
      int HSC, VSC, Vsrc, Hsrc, filter, Vlines;
      int is_50Hz = !(cx25840_get_v4lstd(client) & V4L2_STD_525_60);

      switch (fmt->type) {
      case V4L2_BUF_TYPE_VIDEO_CAPTURE:
            pix = &(fmt->fmt.pix);

            Vsrc = (cx25840_read(client, 0x476) & 0x3f) << 4;
            Vsrc |= (cx25840_read(client, 0x475) & 0xf0) >> 4;

            Hsrc = (cx25840_read(client, 0x472) & 0x3f) << 4;
            Hsrc |= (cx25840_read(client, 0x471) & 0xf0) >> 4;

            Vlines = pix->height + (is_50Hz ? 4 : 7);

            if ((pix->width * 16 < Hsrc) || (Hsrc < pix->width) ||
                (Vlines * 8 < Vsrc) || (Vsrc < Vlines)) {
                  v4l_err(client, "%dx%d is not a valid size!\n",
                            pix->width, pix->height);
                  return -ERANGE;
            }

            HSC = (Hsrc * (1 << 20)) / pix->width - (1 << 20);
            VSC = (1 << 16) - (Vsrc * (1 << 9) / Vlines - (1 << 9));
            VSC &= 0x1fff;

            if (pix->width >= 385)
                  filter = 0;
            else if (pix->width > 192)
                  filter = 1;
            else if (pix->width > 96)
                  filter = 2;
            else
                  filter = 3;

            v4l_dbg(1, cx25840_debug, client, "decoder set size %dx%d -> scale  %ux%u\n",
                      pix->width, pix->height, HSC, VSC);

            /* HSCALE=HSC */
            cx25840_write(client, 0x418, HSC & 0xff);
            cx25840_write(client, 0x419, (HSC >> 8) & 0xff);
            cx25840_write(client, 0x41a, HSC >> 16);
            /* VSCALE=VSC */
            cx25840_write(client, 0x41c, VSC & 0xff);
            cx25840_write(client, 0x41d, VSC >> 8);
            /* VS_INTRLACE=1 VFILT=filter */
            cx25840_write(client, 0x41e, 0x8 | filter);
            break;

      case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
            return cx25840_vbi(client, VIDIOC_S_FMT, fmt);

      case V4L2_BUF_TYPE_VBI_CAPTURE:
            return cx25840_vbi(client, VIDIOC_S_FMT, fmt);

      default:
            return -EINVAL;
      }

      return 0;
}

/* ----------------------------------------------------------------------- */

static int cx25840_command(struct i2c_client *client, unsigned int cmd,
                     void *arg)
{
      struct cx25840_state *state = i2c_get_clientdata(client);
      struct v4l2_tuner *vt = arg;
      struct v4l2_routing *route = arg;

      /* ignore these commands */
      switch (cmd) {
            case TUNER_SET_TYPE_ADDR:
                  return 0;
      }

      if (!state->is_initialized) {
            v4l_dbg(1, cx25840_debug, client, "cmd %08x triggered fw load\n", cmd);
            /* initialize on first use */
            state->is_initialized = 1;
            if (state->is_cx25836)
                  cx25836_initialize(client);
            else
                  cx25840_initialize(client);
      }

      switch (cmd) {
#ifdef CONFIG_VIDEO_ADV_DEBUG
      /* ioctls to allow direct access to the
       * cx25840 registers for testing */
      case VIDIOC_DBG_G_REGISTER:
      case VIDIOC_DBG_S_REGISTER:
      {
            struct v4l2_register *reg = arg;

            if (!v4l2_chip_match_i2c_client(client, reg->match_type, reg->match_chip))
                  return -EINVAL;
            if (!capable(CAP_SYS_ADMIN))
                  return -EPERM;
            if (cmd == VIDIOC_DBG_G_REGISTER)
                  reg->val = cx25840_read(client, reg->reg & 0x0fff);
            else
                  cx25840_write(client, reg->reg & 0x0fff, reg->val & 0xff);
            break;
      }
#endif

      case VIDIOC_INT_DECODE_VBI_LINE:
            return cx25840_vbi(client, cmd, arg);

      case VIDIOC_INT_AUDIO_CLOCK_FREQ:
            return cx25840_audio(client, cmd, arg);

      case VIDIOC_STREAMON:
            v4l_dbg(1, cx25840_debug, client, "enable output\n");
            cx25840_write(client, 0x115, state->is_cx25836 ? 0x0c : 0x8c);
            cx25840_write(client, 0x116, state->is_cx25836 ? 0x04 : 0x07);
            break;

      case VIDIOC_STREAMOFF:
            v4l_dbg(1, cx25840_debug, client, "disable output\n");
            cx25840_write(client, 0x115, 0x00);
            cx25840_write(client, 0x116, 0x00);
            break;

      case VIDIOC_LOG_STATUS:
            log_video_status(client);
            if (!state->is_cx25836)
                  log_audio_status(client);
            break;

      case VIDIOC_G_CTRL:
            return get_v4lctrl(client, (struct v4l2_control *)arg);

      case VIDIOC_S_CTRL:
            return set_v4lctrl(client, (struct v4l2_control *)arg);

      case VIDIOC_QUERYCTRL:
      {
            struct v4l2_queryctrl *qc = arg;

            switch (qc->id) {
                  case V4L2_CID_BRIGHTNESS:
                  case V4L2_CID_CONTRAST:
                  case V4L2_CID_SATURATION:
                  case V4L2_CID_HUE:
                        return v4l2_ctrl_query_fill_std(qc);
                  default:
                        break;
            }
            if (state->is_cx25836)
                  return -EINVAL;

            switch (qc->id) {
                  case V4L2_CID_AUDIO_VOLUME:
                  case V4L2_CID_AUDIO_MUTE:
                  case V4L2_CID_AUDIO_BALANCE:
                  case V4L2_CID_AUDIO_BASS:
                  case V4L2_CID_AUDIO_TREBLE:
                        return v4l2_ctrl_query_fill_std(qc);
                  default:
                        return -EINVAL;
            }
            return -EINVAL;
      }

      case VIDIOC_G_STD:
            *(v4l2_std_id *)arg = cx25840_get_v4lstd(client);
            break;

      case VIDIOC_S_STD:
            state->radio = 0;
            return set_v4lstd(client, *(v4l2_std_id *)arg);

      case AUDC_SET_RADIO:
            state->radio = 1;
            break;

      case VIDIOC_INT_G_VIDEO_ROUTING:
            route->input = state->vid_input;
            route->output = 0;
            break;

      case VIDIOC_INT_S_VIDEO_ROUTING:
            return set_input(client, route->input, state->aud_input);

      case VIDIOC_INT_G_AUDIO_ROUTING:
            if (state->is_cx25836)
                  return -EINVAL;
            route->input = state->aud_input;
            route->output = 0;
            break;

      case VIDIOC_INT_S_AUDIO_ROUTING:
            if (state->is_cx25836)
                  return -EINVAL;
            return set_input(client, state->vid_input, route->input);

      case VIDIOC_S_FREQUENCY:
            if (!state->is_cx25836) {
                  input_change(client);
            }
            break;

      case VIDIOC_G_TUNER:
      {
            u8 vpres = cx25840_read(client, 0x40e) & 0x20;
            u8 mode;
            int val = 0;

            if (state->radio)
                  break;

            vt->signal = vpres ? 0xffff : 0x0;
            if (state->is_cx25836)
                  break;

            vt->capability |=
                V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LANG1 |
                V4L2_TUNER_CAP_LANG2 | V4L2_TUNER_CAP_SAP;

            mode = cx25840_read(client, 0x804);

            /* get rxsubchans and audmode */
            if ((mode & 0xf) == 1)
                  val |= V4L2_TUNER_SUB_STEREO;
            else
                  val |= V4L2_TUNER_SUB_MONO;

            if (mode == 2 || mode == 4)
                  val = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;

            if (mode & 0x10)
                  val |= V4L2_TUNER_SUB_SAP;

            vt->rxsubchans = val;
            vt->audmode = state->audmode;
            break;
      }

      case VIDIOC_S_TUNER:
            if (state->radio || state->is_cx25836)
                  break;

            switch (vt->audmode) {
            case V4L2_TUNER_MODE_MONO:
                  /* mono      -> mono
                     stereo    -> mono
                     bilingual -> lang1 */
                  cx25840_and_or(client, 0x809, ~0xf, 0x00);
                  break;
            case V4L2_TUNER_MODE_STEREO:
            case V4L2_TUNER_MODE_LANG1:
                  /* mono      -> mono
                     stereo    -> stereo
                     bilingual -> lang1 */
                  cx25840_and_or(client, 0x809, ~0xf, 0x04);
                  break;
            case V4L2_TUNER_MODE_LANG1_LANG2:
                  /* mono      -> mono
                     stereo    -> stereo
                     bilingual -> lang1/lang2 */
                  cx25840_and_or(client, 0x809, ~0xf, 0x07);
                  break;
            case V4L2_TUNER_MODE_LANG2:
                  /* mono      -> mono
                     stereo    -> stereo
                     bilingual -> lang2 */
                  cx25840_and_or(client, 0x809, ~0xf, 0x01);
                  break;
            default:
                  return -EINVAL;
            }
            state->audmode = vt->audmode;
            break;

      case VIDIOC_G_FMT:
            return get_v4lfmt(client, (struct v4l2_format *)arg);

      case VIDIOC_S_FMT:
            return set_v4lfmt(client, (struct v4l2_format *)arg);

      case VIDIOC_INT_RESET:
            if (state->is_cx25836)
                  cx25836_initialize(client);
            else
                  cx25840_initialize(client);
            break;

      case VIDIOC_G_CHIP_IDENT:
            return v4l2_chip_ident_i2c_client(client, arg, state->id, state->rev);

      default:
            return -EINVAL;
      }

      return 0;
}

/* ----------------------------------------------------------------------- */

static struct i2c_driver i2c_driver_cx25840;

static int cx25840_detect_client(struct i2c_adapter *adapter, int address,
                         int kind)
{
      struct i2c_client *client;
      struct cx25840_state *state;
      u32 id;
      u16 device_id;

      /* Check if the adapter supports the needed features
       * Not until kernel version 2.6.11 did the bit-algo
       * correctly report that it would do an I2C-level xfer */
      if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
            return 0;

      client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
      if (client == 0)
            return -ENOMEM;

      client->addr = address;
      client->adapter = adapter;
      client->driver = &i2c_driver_cx25840;
      snprintf(client->name, sizeof(client->name) - 1, "cx25840");

      v4l_dbg(1, cx25840_debug, client, "detecting cx25840 client on address 0x%x\n", client->addr << 1);

      device_id = cx25840_read(client, 0x101) << 8;
      device_id |= cx25840_read(client, 0x100);

      /* The high byte of the device ID should be
       * 0x83 for the cx2583x and 0x84 for the cx2584x */
      if ((device_id & 0xff00) == 0x8300) {
            id = V4L2_IDENT_CX25836 + ((device_id >> 4) & 0xf) - 6;
      }
      else if ((device_id & 0xff00) == 0x8400) {
            id = V4L2_IDENT_CX25840 + ((device_id >> 4) & 0xf);
      }
      else {
            v4l_dbg(1, cx25840_debug, client, "cx25840 not found\n");
            kfree(client);
            return 0;
      }

      state = kzalloc(sizeof(struct cx25840_state), GFP_KERNEL);
      if (state == NULL) {
            kfree(client);
            return -ENOMEM;
      }

      /* Note: revision '(device_id & 0x0f) == 2' was never built. The
         marking skips from 0x1 == 22 to 0x3 == 23. */
      v4l_info(client, "cx25%3x-2%x found @ 0x%x (%s)\n",
                (device_id & 0xfff0) >> 4,
                (device_id & 0x0f) < 3 ? (device_id & 0x0f) + 1 : (device_id & 0x0f),
                client->addr << 1, client->adapter->name);

      i2c_set_clientdata(client, state);
      state->c = client;
      state->is_cx25836 = ((device_id & 0xff00) == 0x8300);
      state->vid_input = CX25840_COMPOSITE7;
      state->aud_input = CX25840_AUDIO8;
      state->audclk_freq = 48000;
      state->pvr150_workaround = 0;
      state->audmode = V4L2_TUNER_MODE_LANG1;
      state->unmute_volume = -1;
      state->vbi_line_offset = 8;
      state->id = id;
      state->rev = device_id;

      i2c_attach_client(client);

      return 0;
}

static int cx25840_attach_adapter(struct i2c_adapter *adapter)
{
      if (adapter->class & I2C_CLASS_TV_ANALOG)
            return i2c_probe(adapter, &addr_data, &cx25840_detect_client);
      return 0;
}

static int cx25840_detach_client(struct i2c_client *client)
{
      struct cx25840_state *state = i2c_get_clientdata(client);
      int err;

      err = i2c_detach_client(client);
      if (err) {
            return err;
      }

      kfree(state);
      kfree(client);

      return 0;
}

/* ----------------------------------------------------------------------- */

static struct i2c_driver i2c_driver_cx25840 = {
      .driver = {
            .name = "cx25840",
      },
      .id = I2C_DRIVERID_CX25840,
      .attach_adapter = cx25840_attach_adapter,
      .detach_client = cx25840_detach_client,
      .command = cx25840_command,
};


static int __init m__init(void)
{
      return i2c_add_driver(&i2c_driver_cx25840);
}

static void __exit m__exit(void)
{
      i2c_del_driver(&i2c_driver_cx25840);
}

module_init(m__init);
module_exit(m__exit);

/* ----------------------------------------------------------------------- */

static void log_video_status(struct i2c_client *client)
{
      static const char *const fmt_strs[] = {
            "0x0",
            "NTSC-M", "NTSC-J", "NTSC-4.43",
            "PAL-BDGHI", "PAL-M", "PAL-N", "PAL-Nc", "PAL-60",
            "0x9", "0xA", "0xB",
            "SECAM",
            "0xD", "0xE", "0xF"
      };

      struct cx25840_state *state = i2c_get_clientdata(client);
      u8 vidfmt_sel = cx25840_read(client, 0x400) & 0xf;
      u8 gen_stat1 = cx25840_read(client, 0x40d);
      u8 gen_stat2 = cx25840_read(client, 0x40e);
      int vid_input = state->vid_input;

      v4l_info(client, "Video signal:              %spresent\n",
                (gen_stat2 & 0x20) ? "" : "not ");
      v4l_info(client, "Detected format:           %s\n",
                fmt_strs[gen_stat1 & 0xf]);

      v4l_info(client, "Specified standard:        %s\n",
                vidfmt_sel ? fmt_strs[vidfmt_sel] : "automatic detection");

      if (vid_input >= CX25840_COMPOSITE1 &&
          vid_input <= CX25840_COMPOSITE8) {
            v4l_info(client, "Specified video input:     Composite %d\n",
                  vid_input - CX25840_COMPOSITE1 + 1);
      } else {
            v4l_info(client, "Specified video input:     S-Video (Luma In%d, Chroma In%d)\n",
                  (vid_input & 0xf0) >> 4, (vid_input & 0xf00) >> 8);
      }

      v4l_info(client, "Specified audioclock freq: %d Hz\n", state->audclk_freq);
}

/* ----------------------------------------------------------------------- */

static void log_audio_status(struct i2c_client *client)
{
      struct cx25840_state *state = i2c_get_clientdata(client);
      u8 download_ctl = cx25840_read(client, 0x803);
      u8 mod_det_stat0 = cx25840_read(client, 0x804);
      u8 mod_det_stat1 = cx25840_read(client, 0x805);
      u8 audio_config = cx25840_read(client, 0x808);
      u8 pref_mode = cx25840_read(client, 0x809);
      u8 afc0 = cx25840_read(client, 0x80b);
      u8 mute_ctl = cx25840_read(client, 0x8d3);
      int aud_input = state->aud_input;
      char *p;

      switch (mod_det_stat0) {
      case 0x00: p = "mono"; break;
      case 0x01: p = "stereo"; break;
      case 0x02: p = "dual"; break;
      case 0x04: p = "tri"; break;
      case 0x10: p = "mono with SAP"; break;
      case 0x11: p = "stereo with SAP"; break;
      case 0x12: p = "dual with SAP"; break;
      case 0x14: p = "tri with SAP"; break;
      case 0xfe: p = "forced mode"; break;
      default: p = "not defined";
      }
      v4l_info(client, "Detected audio mode:       %s\n", p);

      switch (mod_det_stat1) {
      case 0x00: p = "not defined"; break;
      case 0x01: p = "EIAJ"; break;
      case 0x02: p = "A2-M"; break;
      case 0x03: p = "A2-BG"; break;
      case 0x04: p = "A2-DK1"; break;
      case 0x05: p = "A2-DK2"; break;
      case 0x06: p = "A2-DK3"; break;
      case 0x07: p = "A1 (6.0 MHz FM Mono)"; break;
      case 0x08: p = "AM-L"; break;
      case 0x09: p = "NICAM-BG"; break;
      case 0x0a: p = "NICAM-DK"; break;
      case 0x0b: p = "NICAM-I"; break;
      case 0x0c: p = "NICAM-L"; break;
      case 0x0d: p = "BTSC/EIAJ/A2-M Mono (4.5 MHz FMMono)"; break;
      case 0x0e: p = "IF FM Radio"; break;
      case 0x0f: p = "BTSC"; break;
      case 0x10: p = "high-deviation FM"; break;
      case 0x11: p = "very high-deviation FM"; break;
      case 0xfd: p = "unknown audio standard"; break;
      case 0xfe: p = "forced audio standard"; break;
      case 0xff: p = "no detected audio standard"; break;
      default: p = "not defined";
      }
      v4l_info(client, "Detected audio standard:   %s\n", p);
      v4l_info(client, "Audio muted:               %s\n",
                (state->unmute_volume >= 0) ? "yes" : "no");
      v4l_info(client, "Audio microcontroller:     %s\n",
                (download_ctl & 0x10) ?
                        ((mute_ctl & 0x2) ? "detecting" : "running") : "stopped");

      switch (audio_config >> 4) {
      case 0x00: p = "undefined"; break;
      case 0x01: p = "BTSC"; break;
      case 0x02: p = "EIAJ"; break;
      case 0x03: p = "A2-M"; break;
      case 0x04: p = "A2-BG"; break;
      case 0x05: p = "A2-DK1"; break;
      case 0x06: p = "A2-DK2"; break;
      case 0x07: p = "A2-DK3"; break;
      case 0x08: p = "A1 (6.0 MHz FM Mono)"; break;
      case 0x09: p = "AM-L"; break;
      case 0x0a: p = "NICAM-BG"; break;
      case 0x0b: p = "NICAM-DK"; break;
      case 0x0c: p = "NICAM-I"; break;
      case 0x0d: p = "NICAM-L"; break;
      case 0x0e: p = "FM radio"; break;
      case 0x0f: p = "automatic detection"; break;
      default: p = "undefined";
      }
      v4l_info(client, "Configured audio standard: %s\n", p);

      if ((audio_config >> 4) < 0xF) {
            switch (audio_config & 0xF) {
            case 0x00: p = "MONO1 (LANGUAGE A/Mono L+R channel for BTSC, EIAJ, A2)"; break;
            case 0x01: p = "MONO2 (LANGUAGE B)"; break;
            case 0x02: p = "MONO3 (STEREO forced MONO)"; break;
            case 0x03: p = "MONO4 (NICAM ANALOG-Language C/Analog Fallback)"; break;
            case 0x04: p = "STEREO"; break;
            case 0x05: p = "DUAL1 (AB)"; break;
            case 0x06: p = "DUAL2 (AC) (FM)"; break;
            case 0x07: p = "DUAL3 (BC) (FM)"; break;
            case 0x08: p = "DUAL4 (AC) (AM)"; break;
            case 0x09: p = "DUAL5 (BC) (AM)"; break;
            case 0x0a: p = "SAP"; break;
            default: p = "undefined";
            }
            v4l_info(client, "Configured audio mode:     %s\n", p);
      } else {
            switch (audio_config & 0xF) {
            case 0x00: p = "BG"; break;
            case 0x01: p = "DK1"; break;
            case 0x02: p = "DK2"; break;
            case 0x03: p = "DK3"; break;
            case 0x04: p = "I"; break;
            case 0x05: p = "L"; break;
            case 0x06: p = "BTSC"; break;
            case 0x07: p = "EIAJ"; break;
            case 0x08: p = "A2-M"; break;
            case 0x09: p = "FM Radio"; break;
            case 0x0f: p = "automatic standard and mode detection"; break;
            default: p = "undefined";
            }
            v4l_info(client, "Configured audio system:   %s\n", p);
      }

      if (aud_input) {
            v4l_info(client, "Specified audio input:     Tuner (In%d)\n", aud_input);
      } else {
            v4l_info(client, "Specified audio input:     External\n");
      }

      switch (pref_mode & 0xf) {
      case 0: p = "mono/language A"; break;
      case 1: p = "language B"; break;
      case 2: p = "language C"; break;
      case 3: p = "analog fallback"; break;
      case 4: p = "stereo"; break;
      case 5: p = "language AC"; break;
      case 6: p = "language BC"; break;
      case 7: p = "language AB"; break;
      default: p = "undefined";
      }
      v4l_info(client, "Preferred audio mode:      %s\n", p);

      if ((audio_config & 0xf) == 0xf) {
            switch ((afc0 >> 3) & 0x3) {
            case 0: p = "system DK"; break;
            case 1: p = "system L"; break;
            case 2: p = "autodetect"; break;
            default: p = "undefined";
            }
            v4l_info(client, "Selected 65 MHz format:    %s\n", p);

            switch (afc0 & 0x7) {
            case 0: p = "chroma"; break;
            case 1: p = "BTSC"; break;
            case 2: p = "EIAJ"; break;
            case 3: p = "A2-M"; break;
            case 4: p = "autodetect"; break;
            default: p = "undefined";
            }
            v4l_info(client, "Selected 45 MHz format:    %s\n", p);
      }
}

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