ALSA: hda - Move chmap support helpers/ops to core

Chmap helpers, ops, controls are moved to core.

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 742 insertions, 0 deletions

diff --git a/sound/hda/hdmi_chmap.c b/sound/hda/hdmi_chmap.c
index 6b98790..880666a 100644
--- a/sound/hda/hdmi_chmap.c
+++ b/sound/hda/hdmi_chmap.c
@@ -2,8 +2,182 @@
  * HDMI Channel map support helpers
  */
 
+#include <linux/module.h>
+#include <sound/control.h>
+#include <sound/tlv.h>
 #include <sound/hda_chmap.h>
 
+/*
+ * 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           */
+};
+
+static const char * const cea_speaker_allocation_names[] = {
+	/*  0 */ "FL/FR",
+	/*  1 */ "LFE",
+	/*  2 */ "FC",
+	/*  3 */ "RL/RR",
+	/*  4 */ "RC",
+	/*  5 */ "FLC/FRC",
+	/*  6 */ "RLC/RRC",
+	/*  7 */ "FLW/FRW",
+	/*  8 */ "FLH/FRH",
+	/*  9 */ "TC",
+	/* 10 */ "FCH",
+};
+
+/*
+ * 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,
+};
+
+/*
+ * ALSA sequence is:
+ *
+ *       surround40   surround41   surround50   surround51   surround71
+ * ch0   front left   =            =            =            =
+ * ch1   front right  =            =            =            =
+ * ch2   rear left    =            =            =            =
+ * ch3   rear right   =            =            =            =
+ * ch4                LFE          center       center       center
+ * ch5                                          LFE          LFE
+ * ch6                                                       side left
+ * ch7                                                       side right
+ *
+ * surround71 = {FL, FR, RLC, RRC, FC, LFE, RL, RR}
+ */
+static int hdmi_channel_mapping[0x32][8] = {
+	/* stereo */
+	[0x00] = { 0x00, 0x11, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7 },
+	/* 2.1 */
+	[0x01] = { 0x00, 0x11, 0x22, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7 },
+	/* Dolby Surround */
+	[0x02] = { 0x00, 0x11, 0x23, 0xf2, 0xf4, 0xf5, 0xf6, 0xf7 },
+	/* surround40 */
+	[0x08] = { 0x00, 0x11, 0x24, 0x35, 0xf3, 0xf2, 0xf6, 0xf7 },
+	/* 4ch */
+	[0x03] = { 0x00, 0x11, 0x23, 0x32, 0x44, 0xf5, 0xf6, 0xf7 },
+	/* surround41 */
+	[0x09] = { 0x00, 0x11, 0x24, 0x35, 0x42, 0xf3, 0xf6, 0xf7 },
+	/* surround50 */
+	[0x0a] = { 0x00, 0x11, 0x24, 0x35, 0x43, 0xf2, 0xf6, 0xf7 },
+	/* surround51 */
+	[0x0b] = { 0x00, 0x11, 0x24, 0x35, 0x43, 0x52, 0xf6, 0xf7 },
+	/* 7.1 */
+	[0x13] = { 0x00, 0x11, 0x26, 0x37, 0x43, 0x52, 0x64, 0x75 },
+};
+
+/*
+ * This is an ordered list!
+ *
+ * The preceding ones have better chances to be selected by
+ * hdmi_channel_allocation().
+ */
+static struct hdac_cea_channel_speaker_allocation channel_allocations[] = {
+/*			  channel:   7     6    5    4    3     2    1    0  */
+{ .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 } },
+				 /* surround40 */
+{ .ca_index = 0x08,  .speakers = {   0,    0,  RR,  RL,   0,    0,  FR,  FL } },
+				 /* surround41 */
+{ .ca_index = 0x09,  .speakers = {   0,    0,  RR,  RL,   0,  LFE,  FR,  FL } },
+				 /* surround50 */
+{ .ca_index = 0x0a,  .speakers = {   0,    0,  RR,  RL,  FC,    0,  FR,  FL } },
+				 /* surround51 */
+{ .ca_index = 0x0b,  .speakers = {   0,    0,  RR,  RL,  FC,  LFE,  FR,  FL } },
+				 /* 6.1 */
+{ .ca_index = 0x0f,  .speakers = {   0,   RC,  RR,  RL,  FC,  LFE,  FR,  FL } },
+				 /* surround71 */
+{ .ca_index = 0x13,  .speakers = { RRC,  RLC,  RR,  RL,  FC,  LFE,  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 = 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 } },
+{ .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 } },
+{ .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 } },
+};
+
 static int hdmi_pin_set_slot_channel(struct hdac_device *codec,
 		hda_nid_t pin_nid, int asp_slot, int channel)
 {
@@ -34,7 +208,548 @@ static void hdmi_set_channel_count(struct hdac_device *codec,
 				    AC_VERB_SET_CVT_CHAN_COUNT, chs - 1);
 }
 
+/*
+ * Channel mapping routines
+ */
+
+/*
+ * Compute derived values in channel_allocations[].
+ */
+static void init_channel_allocations(void)
+{
+	int i, j;
+	struct hdac_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];
+			}
+	}
+}
+
+static int get_channel_allocation_order(int ca)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
+		if (channel_allocations[i].ca_index == ca)
+			break;
+	}
+	return i;
+}
+
+void snd_print_channel_allocation(int spk_alloc, char *buf, int buflen)
+{
+	int i, j;
+
+	for (i = 0, j = 0; i < ARRAY_SIZE(cea_speaker_allocation_names); i++) {
+		if (spk_alloc & (1 << i))
+			j += snprintf(buf + j, buflen - j,  " %s",
+					cea_speaker_allocation_names[i]);
+	}
+	buf[j] = '\0';	/* necessary when j == 0 */
+}
+EXPORT_SYMBOL_GPL(snd_print_channel_allocation);
+
+/*
+ * 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_channel_allocation_spk_alloc_blk(struct hdac_device *codec,
+				   int spk_alloc, int channels)
+{
+	int i;
+	int ca = 0;
+	int spk_mask = 0;
+	char buf[SND_PRINT_CHANNEL_ALLOCATION_ADVISED_BUFSIZE];
+
+	/*
+	 * CA defaults to 0 for basic stereo audio
+	 */
+	if (channels <= 2)
+		return 0;
+
+	/*
+	 * 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 (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) {
+			ca = channel_allocations[i].ca_index;
+			break;
+		}
+	}
+
+	if (!ca) {
+		/*
+		 * if there was no match, select the regular ALSA channel
+		 * allocation with the matching number of channels
+		 */
+		for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
+			if (channels == channel_allocations[i].channels) {
+				ca = channel_allocations[i].ca_index;
+				break;
+			}
+		}
+	}
+
+	snd_print_channel_allocation(spk_alloc, buf, sizeof(buf));
+	dev_dbg(&codec->dev, "HDMI: select CA 0x%x for %d-channel allocation: %s\n",
+		    ca, channels, buf);
+
+	return ca;
+}
+
+static void hdmi_debug_channel_mapping(struct hdac_chmap *chmap,
+				       hda_nid_t pin_nid)
+{
+#ifdef CONFIG_SND_DEBUG_VERBOSE
+	int i;
+	int channel;
+
+	for (i = 0; i < 8; i++) {
+		channel = chmap->ops.pin_get_slot_channel(
+				chmap->hdac, pin_nid, i);
+		dev_dbg(&chmap->hdac->dev, "HDMI: ASP channel %d => slot %d\n",
+						channel, i);
+	}
+#endif
+}
+
+static void hdmi_std_setup_channel_mapping(struct hdac_chmap *chmap,
+				       hda_nid_t pin_nid,
+				       bool non_pcm,
+				       int ca)
+{
+	struct hdac_cea_channel_speaker_allocation *ch_alloc;
+	int i;
+	int err;
+	int order;
+	int non_pcm_mapping[8];
+
+	order = get_channel_allocation_order(ca);
+	ch_alloc = &channel_allocations[order];
+
+	if (hdmi_channel_mapping[ca][1] == 0) {
+		int hdmi_slot = 0;
+		/* fill actual channel mappings in ALSA channel (i) order */
+		for (i = 0; i < ch_alloc->channels; i++) {
+			while (!ch_alloc->speakers[7 - hdmi_slot] && !WARN_ON(hdmi_slot >= 8))
+				hdmi_slot++; /* skip zero slots */
+
+			hdmi_channel_mapping[ca][i] = (i << 4) | hdmi_slot++;
+		}
+		/* fill the rest of the slots with ALSA channel 0xf */
+		for (hdmi_slot = 0; hdmi_slot < 8; hdmi_slot++)
+			if (!ch_alloc->speakers[7 - hdmi_slot])
+				hdmi_channel_mapping[ca][i++] = (0xf << 4) | hdmi_slot;
+	}
+
+	if (non_pcm) {
+		for (i = 0; i < ch_alloc->channels; i++)
+			non_pcm_mapping[i] = (i << 4) | i;
+		for (; i < 8; i++)
+			non_pcm_mapping[i] = (0xf << 4) | i;
+	}
+
+	for (i = 0; i < 8; i++) {
+		int slotsetup = non_pcm ? non_pcm_mapping[i] : hdmi_channel_mapping[ca][i];
+		int hdmi_slot = slotsetup & 0x0f;
+		int channel = (slotsetup & 0xf0) >> 4;
+
+		err = chmap->ops.pin_set_slot_channel(chmap->hdac,
+				pin_nid, hdmi_slot, channel);
+		if (err) {
+			dev_dbg(&chmap->hdac->dev, "HDMI: channel mapping failed\n");
+			break;
+		}
+	}
+}
+
+struct channel_map_table {
+	unsigned char map;		/* ALSA API channel map position */
+	int spk_mask;			/* speaker position bit mask */
+};
+
+static struct channel_map_table map_tables[] = {
+	{ SNDRV_CHMAP_FL,	FL },
+	{ SNDRV_CHMAP_FR,	FR },
+	{ SNDRV_CHMAP_RL,	RL },
+	{ SNDRV_CHMAP_RR,	RR },
+	{ SNDRV_CHMAP_LFE,	LFE },
+	{ SNDRV_CHMAP_FC,	FC },
+	{ SNDRV_CHMAP_RLC,	RLC },
+	{ SNDRV_CHMAP_RRC,	RRC },
+	{ SNDRV_CHMAP_RC,	RC },
+	{ SNDRV_CHMAP_FLC,	FLC },
+	{ SNDRV_CHMAP_FRC,	FRC },
+	{ SNDRV_CHMAP_TFL,	FLH },
+	{ SNDRV_CHMAP_TFR,	FRH },
+	{ SNDRV_CHMAP_FLW,	FLW },
+	{ SNDRV_CHMAP_FRW,	FRW },
+	{ SNDRV_CHMAP_TC,	TC },
+	{ SNDRV_CHMAP_TFC,	FCH },
+	{} /* terminator */
+};
+
+/* from ALSA API channel position to speaker bit mask */
+int to_spk_mask(unsigned char c)
+{
+	struct channel_map_table *t = map_tables;
+
+	for (; t->map; t++) {
+		if (t->map == c)
+			return t->spk_mask;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(to_spk_mask);
+
+/* from ALSA API channel position to CEA slot */
+static int to_cea_slot(int ordered_ca, unsigned char pos)
+{
+	int mask = to_spk_mask(pos);
+	int i;
+
+	if (mask) {
+		for (i = 0; i < 8; i++) {
+			if (channel_allocations[ordered_ca].speakers[7 - i] == mask)
+				return i;
+		}
+	}
+
+	return -1;
+}
+
+/* from speaker bit mask to ALSA API channel position */
+int spk_to_chmap(int spk)
+{
+	struct channel_map_table *t = map_tables;
+
+	for (; t->map; t++) {
+		if (t->spk_mask == spk)
+			return t->map;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(spk_to_chmap);
+
+/* from CEA slot to ALSA API channel position */
+static int from_cea_slot(int ordered_ca, unsigned char slot)
+{
+	int mask = channel_allocations[ordered_ca].speakers[7 - slot];
+
+	return spk_to_chmap(mask);
+}
+
+/* get the CA index corresponding to the given ALSA API channel map */
+static int hdmi_manual_channel_allocation(int chs, unsigned char *map)
+{
+	int i, spks = 0, spk_mask = 0;
+
+	for (i = 0; i < chs; i++) {
+		int mask = to_spk_mask(map[i]);
+
+		if (mask) {
+			spk_mask |= mask;
+			spks++;
+		}
+	}
+
+	for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
+		if ((chs == channel_allocations[i].channels ||
+		     spks == channel_allocations[i].channels) &&
+		    (spk_mask & channel_allocations[i].spk_mask) ==
+				channel_allocations[i].spk_mask)
+			return channel_allocations[i].ca_index;
+	}
+	return -1;
+}
+
+/* set up the channel slots for the given ALSA API channel map */
+static int hdmi_manual_setup_channel_mapping(struct hdac_chmap *chmap,
+					     hda_nid_t pin_nid,
+					     int chs, unsigned char *map,
+					     int ca)
+{
+	int ordered_ca = get_channel_allocation_order(ca);
+	int alsa_pos, hdmi_slot;
+	int assignments[8] = {[0 ... 7] = 0xf};
+
+	for (alsa_pos = 0; alsa_pos < chs; alsa_pos++) {
+
+		hdmi_slot = to_cea_slot(ordered_ca, map[alsa_pos]);
+
+		if (hdmi_slot < 0)
+			continue; /* unassigned channel */
+
+		assignments[hdmi_slot] = alsa_pos;
+	}
+
+	for (hdmi_slot = 0; hdmi_slot < 8; hdmi_slot++) {
+		int err;
+
+		err = chmap->ops.pin_set_slot_channel(chmap->hdac,
+				pin_nid, hdmi_slot, assignments[hdmi_slot]);
+		if (err)
+			return -EINVAL;
+	}
+	return 0;
+}
+
+/* store ALSA API channel map from the current default map */
+static void hdmi_setup_fake_chmap(unsigned char *map, int ca)
+{
+	int i;
+	int ordered_ca = get_channel_allocation_order(ca);
+
+	for (i = 0; i < 8; i++) {
+		if (i < channel_allocations[ordered_ca].channels)
+			map[i] = from_cea_slot(ordered_ca, hdmi_channel_mapping[ca][i] & 0x0f);
+		else
+			map[i] = 0;
+	}
+}
+
+void hdmi_setup_channel_mapping(struct hdac_chmap *chmap,
+				       hda_nid_t pin_nid, bool non_pcm, int ca,
+				       int channels, unsigned char *map,
+				       bool chmap_set)
+{
+	if (!non_pcm && chmap_set) {
+		hdmi_manual_setup_channel_mapping(chmap, pin_nid,
+						  channels, map, ca);
+	} else {
+		hdmi_std_setup_channel_mapping(chmap, pin_nid, non_pcm, ca);
+		hdmi_setup_fake_chmap(map, ca);
+	}
+
+	hdmi_debug_channel_mapping(chmap, pin_nid);
+}
+EXPORT_SYMBOL_GPL(hdmi_setup_channel_mapping);
+
+int hdmi_get_active_channels(int ca)
+{
+	int ordered_ca = get_channel_allocation_order(ca);
+
+	return channel_allocations[ordered_ca].channels;
+}
+EXPORT_SYMBOL_GPL(hdmi_get_active_channels);
+
+struct hdac_cea_channel_speaker_allocation *hdmi_get_ch_alloc_from_ca(int ca)
+{
+	return &channel_allocations[get_channel_allocation_order(ca)];
+}
+EXPORT_SYMBOL_GPL(hdmi_get_ch_alloc_from_ca);
+
+int hdmi_channel_allocation(struct hdac_device *hdac, int spk_alloc,
+		int channels, bool chmap_set, bool non_pcm, unsigned char *map)
+{
+	int ca;
+
+	if (!non_pcm && chmap_set)
+		ca = hdmi_manual_channel_allocation(channels, map);
+	else
+		ca = hdmi_channel_allocation_spk_alloc_blk(hdac,
+					spk_alloc, channels);
+
+	if (ca < 0)
+		ca = 0;
+
+	return ca;
+}
+EXPORT_SYMBOL_GPL(hdmi_channel_allocation);
+
+/*
+ * ALSA API channel-map control callbacks
+ */
+static int hdmi_chmap_ctl_info(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_info *uinfo)
+{
+	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
+	struct hdac_chmap *chmap = info->private_data;
+
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = chmap->channels_max;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = SNDRV_CHMAP_LAST;
+	return 0;
+}
+
+static int hdmi_chmap_cea_alloc_validate_get_type(struct hdac_chmap *chmap,
+		struct hdac_cea_channel_speaker_allocation *cap, int channels)
+{
+	/* If the speaker allocation matches the channel count, it is OK.*/
+	if (cap->channels != channels)
+		return -1;
+
+	/* all channels are remappable freely */
+	return SNDRV_CTL_TLVT_CHMAP_VAR;
+}
+
+static void hdmi_cea_alloc_to_tlv_chmap(struct hdac_chmap *hchmap,
+		struct hdac_cea_channel_speaker_allocation *cap,
+		unsigned int *chmap, int channels)
+{
+	int count = 0;
+	int c;
+
+	for (c = 7; c >= 0; c--) {
+		int spk = cap->speakers[c];
+
+		if (!spk)
+			continue;
+
+		chmap[count++] = spk_to_chmap(spk);
+	}
+
+	WARN_ON(count != channels);
+}
+
+static int hdmi_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
+			      unsigned int size, unsigned int __user *tlv)
+{
+	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
+	struct hdac_chmap *chmap = info->private_data;
+	unsigned int __user *dst;
+	int chs, count = 0;
+
+	if (size < 8)
+		return -ENOMEM;
+	if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
+		return -EFAULT;
+	size -= 8;
+	dst = tlv + 2;
+	for (chs = 2; chs <= chmap->channels_max; chs++) {
+		int i;
+		struct hdac_cea_channel_speaker_allocation *cap;
+
+		cap = channel_allocations;
+		for (i = 0; i < ARRAY_SIZE(channel_allocations); i++, cap++) {
+			int chs_bytes = chs * 4;
+			int type = chmap->ops.chmap_cea_alloc_validate_get_type(
+								chmap, cap, chs);
+			unsigned int tlv_chmap[8];
+
+			if (type < 0)
+				continue;
+			if (size < 8)
+				return -ENOMEM;
+			if (put_user(type, dst) ||
+			    put_user(chs_bytes, dst + 1))
+				return -EFAULT;
+			dst += 2;
+			size -= 8;
+			count += 8;
+			if (size < chs_bytes)
+				return -ENOMEM;
+			size -= chs_bytes;
+			count += chs_bytes;
+			chmap->ops.cea_alloc_to_tlv_chmap(chmap, cap,
+						tlv_chmap, chs);
+			if (copy_to_user(dst, tlv_chmap, chs_bytes))
+				return -EFAULT;
+			dst += chs;
+		}
+	}
+	if (put_user(count, tlv + 1))
+		return -EFAULT;
+	return 0;
+}
+
+static int hdmi_chmap_ctl_get(struct snd_kcontrol *kcontrol,
+			      struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
+	struct hdac_chmap *chmap = info->private_data;
+	int pcm_idx = kcontrol->private_value;
+	unsigned char pcm_chmap[8];
+	int i;
+
+	memset(pcm_chmap, 0, sizeof(pcm_chmap));
+	chmap->ops.get_chmap(chmap->hdac, pcm_idx, pcm_chmap);
+
+	for (i = 0; i < sizeof(chmap); i++)
+		ucontrol->value.integer.value[i] = pcm_chmap[i];
+
+	return 0;
+}
+
+static int hdmi_chmap_ctl_put(struct snd_kcontrol *kcontrol,
+			      struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
+	struct hdac_chmap *hchmap = info->private_data;
+	int pcm_idx = kcontrol->private_value;
+	unsigned int ctl_idx;
+	struct snd_pcm_substream *substream;
+	unsigned char chmap[8], per_pin_chmap[8];
+	int i, err, ca, prepared = 0;
+
+	/* No monitor is connected in dyn_pcm_assign.
+	 * It's invalid to setup the chmap
+	 */
+	if (!hchmap->ops.is_pcm_attached(hchmap->hdac, pcm_idx))
+		return 0;
+
+	ctl_idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
+	substream = snd_pcm_chmap_substream(info, ctl_idx);
+	if (!substream || !substream->runtime)
+		return 0; /* just for avoiding error from alsactl restore */
+	switch (substream->runtime->status->state) {
+	case SNDRV_PCM_STATE_OPEN:
+	case SNDRV_PCM_STATE_SETUP:
+		break;
+	case SNDRV_PCM_STATE_PREPARED:
+		prepared = 1;
+		break;
+	default:
+		return -EBUSY;
+	}
+	memset(chmap, 0, sizeof(chmap));
+	for (i = 0; i < ARRAY_SIZE(chmap); i++)
+		chmap[i] = ucontrol->value.integer.value[i];
+
+	hchmap->ops.get_chmap(hchmap->hdac, pcm_idx, per_pin_chmap);
+	if (!memcmp(chmap, per_pin_chmap, sizeof(chmap)))
+		return 0;
+	ca = hdmi_manual_channel_allocation(ARRAY_SIZE(chmap), chmap);
+	if (ca < 0)
+		return -EINVAL;
+	if (hchmap->ops.chmap_validate) {
+		err = hchmap->ops.chmap_validate(hchmap, ca,
+				ARRAY_SIZE(chmap), chmap);
+		if (err)
+			return err;
+	}
+
+	hchmap->ops.set_chmap(hchmap->hdac, pcm_idx, chmap, prepared);
+
+	return 0;
+}
+
 static const struct hdac_chmap_ops chmap_ops = {
+	.chmap_cea_alloc_validate_get_type	= hdmi_chmap_cea_alloc_validate_get_type,
+	.cea_alloc_to_tlv_chmap			= hdmi_cea_alloc_to_tlv_chmap,
 	.pin_get_slot_channel			= hdmi_pin_get_slot_channel,
 	.pin_set_slot_channel			= hdmi_pin_set_slot_channel,
 	.set_channel_count			= hdmi_set_channel_count,
@@ -45,5 +760,32 @@ void snd_hdac_register_chmap_ops(struct hdac_device *hdac,
 {
 	chmap->ops = chmap_ops;
 	chmap->hdac = hdac;
+	init_channel_allocations();
 }
 EXPORT_SYMBOL_GPL(snd_hdac_register_chmap_ops);
+
+int snd_hdac_add_chmap_ctls(struct snd_pcm *pcm, int pcm_idx,
+				struct hdac_chmap *hchmap)
+{
+	struct snd_pcm_chmap *chmap;
+	struct snd_kcontrol *kctl;
+	int err, i;
+
+	err = snd_pcm_add_chmap_ctls(pcm,
+				     SNDRV_PCM_STREAM_PLAYBACK,
+				     NULL, 0, pcm_idx, &chmap);
+	if (err < 0)
+		return err;
+	/* override handlers */
+	chmap->private_data = hchmap;
+	kctl = chmap->kctl;
+	for (i = 0; i < kctl->count; i++)
+		kctl->vd[i].access |= SNDRV_CTL_ELEM_ACCESS_WRITE;
+	kctl->info = hdmi_chmap_ctl_info;
+	kctl->get = hdmi_chmap_ctl_get;
+	kctl->put = hdmi_chmap_ctl_put;
+	kctl->tlv.c = hdmi_chmap_ctl_tlv;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_add_chmap_ctls);