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patch_intelhdmi.c

/*
 *
 *  patch_intelhdmi.c - Patch for Intel HDMI codecs
 *
 *  Copyright(c) 2008 Intel Corporation. All rights reserved.
 *
 *  Authors:
 *                Jiang Zhe <zhe.jiang@intel.com>
 *                Wu Fengguang <wfg@linux.intel.com>
 *
 *  Maintained by:
 *                Wu Fengguang <wfg@linux.intel.com>
 *
 *  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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <sound/core.h>
#include "hda_codec.h"
#include "hda_local.h"

#define CVT_NID         0x02  /* audio converter */
#define PIN_NID         0x03  /* HDMI output pin */

#define INTEL_HDMI_EVENT_TAG        0x08

struct intel_hdmi_spec {
      struct hda_multi_out multiout;
      struct hda_pcm pcm_rec;
      struct hdmi_eld sink_eld;
};

static struct hda_verb pinout_enable_verb[] = {
      {PIN_NID, AC_VERB_SET_PIN_WIDGET_CONTROL, PIN_OUT},
      {} /* terminator */
};

static struct hda_verb unsolicited_response_verb[] = {
      {PIN_NID, AC_VERB_SET_UNSOLICITED_ENABLE, AC_USRSP_EN |
                                      INTEL_HDMI_EVENT_TAG},
      {}
};

static struct hda_verb def_chan_map[] = {
      {CVT_NID, AC_VERB_SET_HDMI_CHAN_SLOT, 0x00},
      {CVT_NID, AC_VERB_SET_HDMI_CHAN_SLOT, 0x11},
      {CVT_NID, AC_VERB_SET_HDMI_CHAN_SLOT, 0x22},
      {CVT_NID, AC_VERB_SET_HDMI_CHAN_SLOT, 0x33},
      {CVT_NID, AC_VERB_SET_HDMI_CHAN_SLOT, 0x44},
      {CVT_NID, AC_VERB_SET_HDMI_CHAN_SLOT, 0x55},
      {CVT_NID, AC_VERB_SET_HDMI_CHAN_SLOT, 0x66},
      {CVT_NID, AC_VERB_SET_HDMI_CHAN_SLOT, 0x77},
      {}
};


struct hdmi_audio_infoframe {
      u8 type; /* 0x84 */
      u8 ver;  /* 0x01 */
      u8 len;  /* 0x0a */

      u8 checksum;      /* PB0 */
      u8 CC02_CT47;     /* CC in bits 0:2, CT in 4:7 */
      u8 SS01_SF24;
      u8 CXT04;
      u8 CA;
      u8 LFEPBL01_LSV36_DM_INH7;
      u8 reserved[5];   /* PB6 - PB10 */
};

/*
 * CEA speaker placement:
 *
 *        FLH       FCH        FRH
 *  FLW    FL  FLC   FC   FRC   FR   FRW
 *
 *                                  LFE
 *                     TC
 *
 *          RL  RLC   RC   RRC   RR
 *
 * The Left/Right Surround channel _notions_ LS/RS in SMPTE 320M corresponds to
 * CEA RL/RR; The SMPTE channel _assignment_ C/LFE is swapped to CEA LFE/FC.
 */
enum cea_speaker_placement {
      FL  = (1 <<  0),  /* Front Left           */
      FC  = (1 <<  1),  /* Front Center         */
      FR  = (1 <<  2),  /* Front Right          */
      FLC = (1 <<  3),  /* Front Left Center    */
      FRC = (1 <<  4),  /* Front Right Center   */
      RL  = (1 <<  5),  /* Rear Left            */
      RC  = (1 <<  6),  /* Rear Center          */
      RR  = (1 <<  7),  /* Rear Right           */
      RLC = (1 <<  8),  /* Rear Left Center     */
      RRC = (1 <<  9),  /* Rear Right Center    */
      LFE = (1 << 10),  /* Low Frequency Effect */
      FLW = (1 << 11),  /* Front Left Wide      */
      FRW = (1 << 12),  /* Front Right Wide     */
      FLH = (1 << 13),  /* Front Left High      */
      FCH = (1 << 14),  /* Front Center High    */
      FRH = (1 << 15),  /* Front Right High     */
      TC  = (1 << 16),  /* Top Center           */
};

/*
 * ELD SA bits in the CEA Speaker Allocation data block
 */
static int eld_speaker_allocation_bits[] = {
      [0] = FL | FR,
      [1] = LFE,
      [2] = FC,
      [3] = RL | RR,
      [4] = RC,
      [5] = FLC | FRC,
      [6] = RLC | RRC,
      /* the following are not defined in ELD yet */
      [7] = FLW | FRW,
      [8] = FLH | FRH,
      [9] = TC,
      [10] = FCH,
};

struct cea_channel_speaker_allocation {
      int ca_index;
      int speakers[8];

      /* derived values, just for convenience */
      int channels;
      int spk_mask;
};

/*
 * This is an ordered list!
 *
 * The preceding ones have better chances to be selected by
 * hdmi_setup_channel_allocation().
 */
static struct cea_channel_speaker_allocation channel_allocations[] = {
/*                  channel:   8     7    6    5    4     3    2    1  */
{ .ca_index = 0x00,  .speakers = {   0,    0,   0,   0,   0,    0,  FR,  FL } },
                         /* 2.1 */
{ .ca_index = 0x01,  .speakers = {   0,    0,   0,   0,   0,  LFE,  FR,  FL } },
                         /* Dolby Surround */
{ .ca_index = 0x02,  .speakers = {   0,    0,   0,   0,  FC,    0,  FR,  FL } },
{ .ca_index = 0x03,  .speakers = {   0,    0,   0,   0,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x04,  .speakers = {   0,    0,   0,  RC,   0,    0,  FR,  FL } },
{ .ca_index = 0x05,  .speakers = {   0,    0,   0,  RC,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x06,  .speakers = {   0,    0,   0,  RC,  FC,    0,  FR,  FL } },
{ .ca_index = 0x07,  .speakers = {   0,    0,   0,  RC,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x08,  .speakers = {   0,    0,  RR,  RL,   0,    0,  FR,  FL } },
{ .ca_index = 0x09,  .speakers = {   0,    0,  RR,  RL,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x0a,  .speakers = {   0,    0,  RR,  RL,  FC,    0,  FR,  FL } },
                         /* 5.1 */
{ .ca_index = 0x0b,  .speakers = {   0,    0,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x0c,  .speakers = {   0,   RC,  RR,  RL,   0,    0,  FR,  FL } },
{ .ca_index = 0x0d,  .speakers = {   0,   RC,  RR,  RL,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x0e,  .speakers = {   0,   RC,  RR,  RL,  FC,    0,  FR,  FL } },
                         /* 6.1 */
{ .ca_index = 0x0f,  .speakers = {   0,   RC,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x10,  .speakers = { RRC,  RLC,  RR,  RL,   0,    0,  FR,  FL } },
{ .ca_index = 0x11,  .speakers = { RRC,  RLC,  RR,  RL,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x12,  .speakers = { RRC,  RLC,  RR,  RL,  FC,    0,  FR,  FL } },
                         /* 7.1 */
{ .ca_index = 0x13,  .speakers = { RRC,  RLC,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x14,  .speakers = { FRC,  FLC,   0,   0,   0,    0,  FR,  FL } },
{ .ca_index = 0x15,  .speakers = { FRC,  FLC,   0,   0,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x16,  .speakers = { FRC,  FLC,   0,   0,  FC,    0,  FR,  FL } },
{ .ca_index = 0x17,  .speakers = { FRC,  FLC,   0,   0,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x18,  .speakers = { FRC,  FLC,   0,  RC,   0,    0,  FR,  FL } },
{ .ca_index = 0x19,  .speakers = { FRC,  FLC,   0,  RC,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x1a,  .speakers = { FRC,  FLC,   0,  RC,  FC,    0,  FR,  FL } },
{ .ca_index = 0x1b,  .speakers = { FRC,  FLC,   0,  RC,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x1c,  .speakers = { FRC,  FLC,  RR,  RL,   0,    0,  FR,  FL } },
{ .ca_index = 0x1d,  .speakers = { FRC,  FLC,  RR,  RL,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x1e,  .speakers = { FRC,  FLC,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x1f,  .speakers = { FRC,  FLC,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x20,  .speakers = {   0,  FCH,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x21,  .speakers = {   0,  FCH,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x22,  .speakers = {  TC,    0,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x23,  .speakers = {  TC,    0,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x24,  .speakers = { FRH,  FLH,  RR,  RL,   0,    0,  FR,  FL } },
{ .ca_index = 0x25,  .speakers = { FRH,  FLH,  RR,  RL,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x26,  .speakers = { FRW,  FLW,  RR,  RL,   0,    0,  FR,  FL } },
{ .ca_index = 0x27,  .speakers = { FRW,  FLW,  RR,  RL,   0,  LFE,  FR,  FL } },
{ .ca_index = 0x28,  .speakers = {  TC,   RC,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x29,  .speakers = {  TC,   RC,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x2a,  .speakers = { FCH,   RC,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x2b,  .speakers = { FCH,   RC,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x2c,  .speakers = {  TC,  FCH,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x2d,  .speakers = {  TC,  FCH,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x2e,  .speakers = { FRH,  FLH,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x2f,  .speakers = { FRH,  FLH,  RR,  RL,  FC,  LFE,  FR,  FL } },
{ .ca_index = 0x30,  .speakers = { FRW,  FLW,  RR,  RL,  FC,    0,  FR,  FL } },
{ .ca_index = 0x31,  .speakers = { FRW,  FLW,  RR,  RL,  FC,  LFE,  FR,  FL } },
};

/*
 * HDMI routines
 */

#ifdef BE_PARANOID
static void hdmi_get_dip_index(struct hda_codec *codec, hda_nid_t nid,
                        int *packet_index, int *byte_index)
{
      int val;

      val = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_INDEX, 0);

      *packet_index = val >> 5;
      *byte_index = val & 0x1f;
}
#endif

static void hdmi_set_dip_index(struct hda_codec *codec, hda_nid_t nid,
                        int packet_index, int byte_index)
{
      int val;

      val = (packet_index << 5) | (byte_index & 0x1f);

      snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_HDMI_DIP_INDEX, val);
}

static void hdmi_write_dip_byte(struct hda_codec *codec, hda_nid_t nid,
                        unsigned char val)
{
      snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_HDMI_DIP_DATA, val);
}

static void hdmi_enable_output(struct hda_codec *codec)
{
      /* Unmute */
      if (get_wcaps(codec, PIN_NID) & AC_WCAP_OUT_AMP)
            snd_hda_codec_write(codec, PIN_NID, 0,
                        AC_VERB_SET_AMP_GAIN_MUTE, AMP_OUT_UNMUTE);
      /* Enable pin out */
      snd_hda_sequence_write(codec, pinout_enable_verb);
}

/*
 * Enable Audio InfoFrame Transmission
 */
static void hdmi_start_infoframe_trans(struct hda_codec *codec)
{
      hdmi_set_dip_index(codec, PIN_NID, 0x0, 0x0);
      snd_hda_codec_write(codec, PIN_NID, 0, AC_VERB_SET_HDMI_DIP_XMIT,
                                    AC_DIPXMIT_BEST);
}

/*
 * Disable Audio InfoFrame Transmission
 */
static void hdmi_stop_infoframe_trans(struct hda_codec *codec)
{
      hdmi_set_dip_index(codec, PIN_NID, 0x0, 0x0);
      snd_hda_codec_write(codec, PIN_NID, 0, AC_VERB_SET_HDMI_DIP_XMIT,
                                    AC_DIPXMIT_DISABLE);
}

static int hdmi_get_channel_count(struct hda_codec *codec)
{
      return 1 + snd_hda_codec_read(codec, CVT_NID, 0,
                              AC_VERB_GET_CVT_CHAN_COUNT, 0);
}

static void hdmi_set_channel_count(struct hda_codec *codec, int chs)
{
      snd_hda_codec_write(codec, CVT_NID, 0,
                              AC_VERB_SET_CVT_CHAN_COUNT, chs - 1);

      if (chs != hdmi_get_channel_count(codec))
            snd_printd(KERN_INFO "HDMI channel count: expect %d, get %d\n",
                              chs, hdmi_get_channel_count(codec));
}

static void hdmi_debug_channel_mapping(struct hda_codec *codec)
{
#ifdef CONFIG_SND_DEBUG_VERBOSE
      int i;
      int slot;

      for (i = 0; i < 8; i++) {
            slot = snd_hda_codec_read(codec, CVT_NID, 0,
                                    AC_VERB_GET_HDMI_CHAN_SLOT, i);
            printk(KERN_DEBUG "HDMI: ASP channel %d => slot %d\n",
                                    slot >> 4, slot & 0x7);
      }
#endif
}

static void hdmi_parse_eld(struct hda_codec *codec)
{
      struct intel_hdmi_spec *spec = codec->spec;
      struct hdmi_eld *eld = &spec->sink_eld;

      if (!snd_hdmi_get_eld(eld, codec, PIN_NID))
            snd_hdmi_show_eld(eld);
}


/*
 * Audio InfoFrame routines
 */

static void hdmi_debug_dip_size(struct hda_codec *codec)
{
#ifdef CONFIG_SND_DEBUG_VERBOSE
      int i;
      int size;

      size = snd_hdmi_get_eld_size(codec, PIN_NID);
      printk(KERN_DEBUG "HDMI: ELD buf size is %d\n", size);

      for (i = 0; i < 8; i++) {
            size = snd_hda_codec_read(codec, PIN_NID, 0,
                                    AC_VERB_GET_HDMI_DIP_SIZE, i);
            printk(KERN_DEBUG "HDMI: DIP GP[%d] buf size is %d\n", i, size);
      }
#endif
}

static void hdmi_clear_dip_buffers(struct hda_codec *codec)
{
#ifdef BE_PARANOID
      int i, j;
      int size;
      int pi, bi;
      for (i = 0; i < 8; i++) {
            size = snd_hda_codec_read(codec, PIN_NID, 0,
                                    AC_VERB_GET_HDMI_DIP_SIZE, i);
            if (size == 0)
                  continue;

            hdmi_set_dip_index(codec, PIN_NID, i, 0x0);
            for (j = 1; j < 1000; j++) {
                  hdmi_write_dip_byte(codec, PIN_NID, 0x0);
                  hdmi_get_dip_index(codec, PIN_NID, &pi, &bi);
                  if (pi != i)
                        snd_printd(KERN_INFO "dip index %d: %d != %d\n",
                                    bi, pi, i);
                  if (bi == 0) /* byte index wrapped around */
                        break;
            }
            snd_printd(KERN_INFO
                  "HDMI: DIP GP[%d] buf reported size=%d, written=%d\n",
                  i, size, j);
      }
#endif
}

static void hdmi_fill_audio_infoframe(struct hda_codec *codec,
                              struct hdmi_audio_infoframe *ai)
{
      u8 *params = (u8 *)ai;
      u8 sum = 0;
      int i;

      hdmi_debug_dip_size(codec);
      hdmi_clear_dip_buffers(codec); /* be paranoid */

      for (i = 0; i < sizeof(ai); i++)
            sum += params[i];
      ai->checksum = - sum;

      hdmi_set_dip_index(codec, PIN_NID, 0x0, 0x0);
      for (i = 0; i < sizeof(ai); i++)
            hdmi_write_dip_byte(codec, PIN_NID, params[i]);
}

/*
 * Compute derived values in channel_allocations[].
 */
static void init_channel_allocations(void)
{
      int i, j;
      struct cea_channel_speaker_allocation *p;

      for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
            p = channel_allocations + i;
            p->channels = 0;
            p->spk_mask = 0;
            for (j = 0; j < ARRAY_SIZE(p->speakers); j++)
                  if (p->speakers[j]) {
                        p->channels++;
                        p->spk_mask |= p->speakers[j];
                  }
      }
}

/*
 * The transformation takes two steps:
 *
 *    eld->spk_alloc => (eld_speaker_allocation_bits[]) => spk_mask
 *          spk_mask => (channel_allocations[])         => ai->CA
 *
 * TODO: it could select the wrong CA from multiple candidates.
*/
static int hdmi_setup_channel_allocation(struct hda_codec *codec,
                               struct hdmi_audio_infoframe *ai)
{
      struct intel_hdmi_spec *spec = codec->spec;
      struct hdmi_eld *eld = &spec->sink_eld;
      int i;
      int spk_mask = 0;
      int channels = 1 + (ai->CC02_CT47 & 0x7);
      char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];

      /*
       * CA defaults to 0 for basic stereo audio
       */
      if (channels <= 2)
            return 0;

      /*
       * HDMI sink's ELD info cannot always be retrieved for now, e.g.
       * in console or for audio devices. Assume the highest speakers
       * configuration, to _not_ prohibit multi-channel audio playback.
       */
      if (!eld->spk_alloc)
            eld->spk_alloc = 0xffff;

      /*
       * expand ELD's speaker allocation mask
       *
       * ELD tells the speaker mask in a compact(paired) form,
       * expand ELD's notions to match the ones used by Audio InfoFrame.
       */
      for (i = 0; i < ARRAY_SIZE(eld_speaker_allocation_bits); i++) {
            if (eld->spk_alloc & (1 << i))
                  spk_mask |= eld_speaker_allocation_bits[i];
      }

      /* search for the first working match in the CA table */
      for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
            if (channels == channel_allocations[i].channels &&
                (spk_mask & channel_allocations[i].spk_mask) ==
                        channel_allocations[i].spk_mask) {
                  ai->CA = channel_allocations[i].ca_index;
                  break;
            }
      }

      snd_print_channel_allocation(eld->spk_alloc, buf, sizeof(buf));
      snd_printdd(KERN_INFO
                  "HDMI: select CA 0x%x for %d-channel allocation: %s\n",
                  ai->CA, channels, buf);

      return ai->CA;
}

static void hdmi_setup_channel_mapping(struct hda_codec *codec,
                              struct hdmi_audio_infoframe *ai)
{
      if (!ai->CA)
            return;

      /*
       * TODO: adjust channel mapping if necessary
       * ALSA sequence is front/surr/clfe/side?
       */

      snd_hda_sequence_write(codec, def_chan_map);
      hdmi_debug_channel_mapping(codec);
}


static void hdmi_setup_audio_infoframe(struct hda_codec *codec,
                              struct snd_pcm_substream *substream)
{
      struct hdmi_audio_infoframe ai = {
            .type       = 0x84,
            .ver        = 0x01,
            .len        = 0x0a,
            .CC02_CT47  = substream->runtime->channels - 1,
      };

      hdmi_setup_channel_allocation(codec, &ai);
      hdmi_setup_channel_mapping(codec, &ai);

      hdmi_fill_audio_infoframe(codec, &ai);
      hdmi_start_infoframe_trans(codec);
}


/*
 * Unsolicited events
 */

static void hdmi_intrinsic_event(struct hda_codec *codec, unsigned int res)
{
      int pind = !!(res & AC_UNSOL_RES_PD);
      int eldv = !!(res & AC_UNSOL_RES_ELDV);

      printk(KERN_INFO
            "HDMI hot plug event: Presence_Detect=%d ELD_Valid=%d\n",
            pind, eldv);

      if (pind && eldv) {
            hdmi_parse_eld(codec);
            /* TODO: do real things about ELD */
      }
}

static void hdmi_non_intrinsic_event(struct hda_codec *codec, unsigned int res)
{
      int subtag = (res & AC_UNSOL_RES_SUBTAG) >> AC_UNSOL_RES_SUBTAG_SHIFT;
      int cp_state = !!(res & AC_UNSOL_RES_CP_STATE);
      int cp_ready = !!(res & AC_UNSOL_RES_CP_READY);

      printk(KERN_INFO
            "HDMI content protection event: SUBTAG=0x%x CP_STATE=%d CP_READY=%d\n",
            subtag,
            cp_state,
            cp_ready);

      /* TODO */
      if (cp_state)
            ;
      if (cp_ready)
            ;
}


static void intel_hdmi_unsol_event(struct hda_codec *codec, unsigned int res)
{
      int tag = res >> AC_UNSOL_RES_TAG_SHIFT;
      int subtag = (res & AC_UNSOL_RES_SUBTAG) >> AC_UNSOL_RES_SUBTAG_SHIFT;

      if (tag != INTEL_HDMI_EVENT_TAG) {
            snd_printd(KERN_INFO "Unexpected HDMI event tag 0x%x\n", tag);
            return;
      }

      if (subtag == 0)
            hdmi_intrinsic_event(codec, res);
      else
            hdmi_non_intrinsic_event(codec, res);
}

/*
 * Callbacks
 */

static int intel_hdmi_playback_pcm_open(struct hda_pcm_stream *hinfo,
                              struct hda_codec *codec,
                              struct snd_pcm_substream *substream)
{
      struct intel_hdmi_spec *spec = codec->spec;

      return snd_hda_multi_out_dig_open(codec, &spec->multiout);
}

static int intel_hdmi_playback_pcm_close(struct hda_pcm_stream *hinfo,
                               struct hda_codec *codec,
                               struct snd_pcm_substream *substream)
{
      struct intel_hdmi_spec *spec = codec->spec;

      hdmi_stop_infoframe_trans(codec);

      return snd_hda_multi_out_dig_close(codec, &spec->multiout);
}

static int intel_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
                                 struct hda_codec *codec,
                                 unsigned int stream_tag,
                                 unsigned int format,
                                 struct snd_pcm_substream *substream)
{
      struct intel_hdmi_spec *spec = codec->spec;

      snd_hda_multi_out_dig_prepare(codec, &spec->multiout, stream_tag,
                                   format, substream);

      hdmi_set_channel_count(codec, substream->runtime->channels);

      hdmi_setup_audio_infoframe(codec, substream);

      return 0;
}

static struct hda_pcm_stream intel_hdmi_pcm_playback = {
      .substreams = 1,
      .channels_min = 2,
      .channels_max = 8,
      .nid = CVT_NID, /* NID to query formats and rates and setup streams */
      .ops = {
            .open    = intel_hdmi_playback_pcm_open,
            .close   = intel_hdmi_playback_pcm_close,
            .prepare = intel_hdmi_playback_pcm_prepare
      },
};

static int intel_hdmi_build_pcms(struct hda_codec *codec)
{
      struct intel_hdmi_spec *spec = codec->spec;
      struct hda_pcm *info = &spec->pcm_rec;

      codec->num_pcms = 1;
      codec->pcm_info = info;

      info->name = "INTEL HDMI";
      info->pcm_type = HDA_PCM_TYPE_HDMI;
      info->stream[SNDRV_PCM_STREAM_PLAYBACK] = intel_hdmi_pcm_playback;

      return 0;
}

static int intel_hdmi_build_controls(struct hda_codec *codec)
{
      struct intel_hdmi_spec *spec = codec->spec;
      int err;

      err = snd_hda_create_spdif_out_ctls(codec, spec->multiout.dig_out_nid);
      if (err < 0)
            return err;

      return 0;
}

static int intel_hdmi_init(struct hda_codec *codec)
{
      hdmi_enable_output(codec);

      snd_hda_sequence_write(codec, unsolicited_response_verb);

      return 0;
}

static void intel_hdmi_free(struct hda_codec *codec)
{
      struct intel_hdmi_spec *spec = codec->spec;

      snd_hda_eld_proc_free(codec, &spec->sink_eld);
      kfree(spec);
}

static struct hda_codec_ops intel_hdmi_patch_ops = {
      .init             = intel_hdmi_init,
      .free             = intel_hdmi_free,
      .build_pcms       = intel_hdmi_build_pcms,
      .build_controls   = intel_hdmi_build_controls,
      .unsol_event            = intel_hdmi_unsol_event,
};

static int patch_intel_hdmi(struct hda_codec *codec)
{
      struct intel_hdmi_spec *spec;

      spec = kzalloc(sizeof(*spec), GFP_KERNEL);
      if (spec == NULL)
            return -ENOMEM;

      spec->multiout.num_dacs = 0;    /* no analog */
      spec->multiout.max_channels = 8;
      spec->multiout.dig_out_nid = CVT_NID;

      codec->spec = spec;
      codec->patch_ops = intel_hdmi_patch_ops;

      snd_hda_eld_proc_new(codec, &spec->sink_eld);

      init_channel_allocations();

      return 0;
}

static struct hda_codec_preset snd_hda_preset_intelhdmi[] = {
      { .id = 0x808629fb, .name = "G45 DEVCL",  .patch = patch_intel_hdmi },
      { .id = 0x80862801, .name = "G45 DEVBLC", .patch = patch_intel_hdmi },
      { .id = 0x80862802, .name = "G45 DEVCTG", .patch = patch_intel_hdmi },
      { .id = 0x80862803, .name = "G45 DEVELK", .patch = patch_intel_hdmi },
      { .id = 0x80862804, .name = "G45 DEVIBX", .patch = patch_intel_hdmi },
      { .id = 0x10951392, .name = "SiI1392 HDMI",     .patch = patch_intel_hdmi },
      {} /* terminator */
};

MODULE_ALIAS("snd-hda-codec-id:808629fb");
MODULE_ALIAS("snd-hda-codec-id:80862801");
MODULE_ALIAS("snd-hda-codec-id:80862802");
MODULE_ALIAS("snd-hda-codec-id:80862803");
MODULE_ALIAS("snd-hda-codec-id:80862804");
MODULE_ALIAS("snd-hda-codec-id:10951392");

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Intel HDMI HD-audio codec");

static struct hda_codec_preset_list intel_list = {
      .preset = snd_hda_preset_intelhdmi,
      .owner = THIS_MODULE,
};

static int __init patch_intelhdmi_init(void)
{
      return snd_hda_add_codec_preset(&intel_list);
}

static void __exit patch_intelhdmi_exit(void)
{
      snd_hda_delete_codec_preset(&intel_list);
}

module_init(patch_intelhdmi_init)
module_exit(patch_intelhdmi_exit)

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