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linux/sound/hda/hdmi_chmap.c
Takashi Iwai 6278056e42 ALSA: hda: Add input value sanity checks to HDMI channel map controls 
Add a simple sanity check to HD-audio HDMI Channel Map controls.
Although the value might not be accepted for the actual connection, we
can filter out some bogus values beforehand, and that should be enough
for making kselftest happier.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/20240616073454.16512-7-tiwai@suse.de
2024-06-18 12:00:19 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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 const 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)
{
return snd_hdac_codec_write(codec, pin_nid, 0,
AC_VERB_SET_HDMI_CHAN_SLOT,
(channel << 4) | asp_slot);
}
static int hdmi_pin_get_slot_channel(struct hdac_device *codec,
hda_nid_t pin_nid, int asp_slot)
{
return (snd_hdac_codec_read(codec, pin_nid, 0,
AC_VERB_GET_HDMI_CHAN_SLOT,
asp_slot) & 0xf0) >> 4;
}
static int hdmi_get_channel_count(struct hdac_device *codec, hda_nid_t cvt_nid)
{
return 1 + snd_hdac_codec_read(codec, cvt_nid, 0,
AC_VERB_GET_CVT_CHAN_COUNT, 0);
}
static void hdmi_set_channel_count(struct hdac_device *codec,
hda_nid_t cvt_nid, int chs)
{
if (chs != hdmi_get_channel_count(codec, cvt_nid))
snd_hdac_codec_write(codec, cvt_nid, 0,
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_hdac_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 += scnprintf(buf + j, buflen - j, " %s",
cea_speaker_allocation_names[i]);
}
buf[j] = '\0'; /* necessary when j == 0 */
}
EXPORT_SYMBOL_GPL(snd_hdac_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_hdac_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 (!WARN_ON(hdmi_slot >= 8) &&
!ch_alloc->speakers[7 - hdmi_slot])
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 snd_hdac_chmap_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(snd_hdac_chmap_to_spk_mask);
/* from ALSA API channel position to CEA slot */
static int to_cea_slot(int ordered_ca, unsigned char pos)
{
int mask = snd_hdac_chmap_to_spk_mask(pos);
int i;
/* Add sanity check to pass klockwork check.
* This should never happen.
*/
if (ordered_ca >= ARRAY_SIZE(channel_allocations))
return -1;
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 snd_hdac_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(snd_hdac_spk_to_chmap);
/* from CEA slot to ALSA API channel position */
static int from_cea_slot(int ordered_ca, unsigned char slot)
{
int mask;
/* Add sanity check to pass klockwork check.
* This should never happen.
*/
if (slot >= 8)
return 0;
mask = channel_allocations[ordered_ca].speakers[7 - slot];
return snd_hdac_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 = snd_hdac_chmap_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 (ordered_ca < ARRAY_SIZE(channel_allocations) &&
i < channel_allocations[ordered_ca].channels)
map[i] = from_cea_slot(ordered_ca, hdmi_channel_mapping[ca][i] & 0x0f);
else
map[i] = 0;
}
}
void snd_hdac_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(snd_hdac_setup_channel_mapping);
int snd_hdac_get_active_channels(int ca)
{
int ordered_ca = get_channel_allocation_order(ca);
/* Add sanity check to pass klockwork check.
* This should never happen.
*/
if (ordered_ca >= ARRAY_SIZE(channel_allocations))
ordered_ca = 0;
return channel_allocations[ordered_ca].channels;
}
EXPORT_SYMBOL_GPL(snd_hdac_get_active_channels);
struct hdac_cea_channel_speaker_allocation *snd_hdac_get_ch_alloc_from_ca(int ca)
{
return &channel_allocations[get_channel_allocation_order(ca)];
}
EXPORT_SYMBOL_GPL(snd_hdac_get_ch_alloc_from_ca);
int snd_hdac_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(snd_hdac_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++] = snd_hdac_spk_to_chmap(spk);
}
WARN_ON(count != channels);
}
static int spk_mask_from_spk_alloc(int spk_alloc)
{
int i;
int spk_mask = eld_speaker_allocation_bits[0];
for (i = 0; i < ARRAY_SIZE(eld_speaker_allocation_bits); i++) {
if (spk_alloc & (1 << i))
spk_mask |= eld_speaker_allocation_bits[i];
}
return spk_mask;
}
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;
int pcm_idx = kcontrol->private_value;
unsigned int __user *dst;
int chs, count = 0;
unsigned long max_chs;
int type;
int spk_alloc, spk_mask;
if (size < 8)
return -ENOMEM;
if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
return -EFAULT;
size -= 8;
dst = tlv + 2;
spk_alloc = chmap->ops.get_spk_alloc(chmap->hdac, pcm_idx);
spk_mask = spk_mask_from_spk_alloc(spk_alloc);
max_chs = hweight_long(spk_mask);
for (chs = 2; chs <= max_chs; 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;
unsigned int tlv_chmap[8];
if (cap->channels != chs)
continue;
if (!(cap->spk_mask == (spk_mask & cap->spk_mask)))
continue;
type = chmap->ops.chmap_cea_alloc_validate_get_type(
chmap, cap, chs);
if (type < 0)
return -ENODEV;
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 < ARRAY_SIZE(pcm_chmap); i++)
ucontrol->value.integer.value[i] = pcm_chmap[i];
return 0;
}
/* a simple sanity check for input values to chmap kcontrol */
static int chmap_value_check(struct hdac_chmap *hchmap,
const struct snd_ctl_elem_value *ucontrol)
{
int i;
for (i = 0; i < hchmap->channels_max; i++) {
if (ucontrol->value.integer.value[i] < 0 ||
ucontrol->value.integer.value[i] > SNDRV_CHMAP_LAST)
return -EINVAL;
}
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;
err = chmap_value_check(hchmap, ucontrol);
if (err < 0)
return err;
/* 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->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,
};
void snd_hdac_register_chmap_ops(struct hdac_device *hdac,
struct hdac_chmap *chmap)
{
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);
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