Merge branch 'topic/hdmi' into for-next

include/sound/pcm_drm_eld.h

+#ifndef __SOUND_PCM_DRM_ELD_H
+#define __SOUND_PCM_DRM_ELD_H
+
+int snd_pcm_hw_constraint_eld(struct snd_pcm_runtime *runtime, void *eld);
+
+#endif

include/sound/pcm_iec958.h

+#ifndef __SOUND_PCM_IEC958_H
+#define __SOUND_PCM_IEC958_H
+
+#include <linux/types.h>
+
+int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
+	size_t len);
+
+#endif

sound/core/Kconfig

@@ -6,6 +6,12 @@ config SND_PCM
 	tristate
 	select SND_TIMER
 
+config SND_PCM_ELD
+	bool
+
+config SND_PCM_IEC958
+	bool
+
 config SND_DMAENGINE_PCM
 	tristate
 

sound/core/Makefile

@@ -16,6 +16,8 @@ snd-$(CONFIG_SND_JACK)	  += ctljack.o jack.o
 snd-pcm-y := pcm.o pcm_native.o pcm_lib.o pcm_timer.o pcm_misc.o \
 		pcm_memory.o memalloc.o
 snd-pcm-$(CONFIG_SND_DMA_SGBUF) += sgbuf.o
+snd-pcm-$(CONFIG_SND_PCM_ELD) += pcm_drm_eld.o
+snd-pcm-$(CONFIG_SND_PCM_IEC958) += pcm_iec958.o
 
 # for trace-points
 CFLAGS_pcm_lib.o := -I$(src)

sound/core/pcm_drm_eld.c

+/*
+ *  PCM DRM helpers
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License version 2 as
+ *   published by the Free Software Foundation.
+ */
+#include <linux/export.h>
+#include <drm/drm_edid.h>
+#include <sound/pcm.h>
+#include <sound/pcm_drm_eld.h>
+
+static const unsigned int eld_rates[] = {
+	32000,
+	44100,
+	48000,
+	88200,
+	96000,
+	176400,
+	192000,
+};
+
+static unsigned int sad_max_channels(const u8 *sad)
+{
+	return 1 + (sad[0] & 7);
+}
+
+static int eld_limit_rates(struct snd_pcm_hw_params *params,
+			   struct snd_pcm_hw_rule *rule)
+{
+	struct snd_interval *r = hw_param_interval(params, rule->var);
+	struct snd_interval *c;
+	unsigned int rate_mask = 7, i;
+	const u8 *sad, *eld = rule->private;
+
+	sad = drm_eld_sad(eld);
+	if (sad) {
+		c = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+
+		for (i = drm_eld_sad_count(eld); i > 0; i--, sad += 3) {
+			unsigned max_channels = sad_max_channels(sad);
+
+			/*
+			 * Exclude SADs which do not include the
+			 * requested number of channels.
+			 */
+			if (c->min <= max_channels)
+				rate_mask |= sad[1];
+		}
+	}
+
+	return snd_interval_list(r, ARRAY_SIZE(eld_rates), eld_rates,
+				 rate_mask);
+}
+
+static int eld_limit_channels(struct snd_pcm_hw_params *params,
+			      struct snd_pcm_hw_rule *rule)
+{
+	struct snd_interval *c = hw_param_interval(params, rule->var);
+	struct snd_interval *r;
+	struct snd_interval t = { .min = 1, .max = 2, .integer = 1, };
+	unsigned int i;
+	const u8 *sad, *eld = rule->private;
+
+	sad = drm_eld_sad(eld);
+	if (sad) {
+		unsigned int rate_mask = 0;
+
+		/* Convert the rate interval to a mask */
+		r = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+		for (i = 0; i < ARRAY_SIZE(eld_rates); i++)
+			if (r->min <= eld_rates[i] && r->max >= eld_rates[i])
+				rate_mask |= BIT(i);
+
+		for (i = drm_eld_sad_count(eld); i > 0; i--, sad += 3)
+			if (rate_mask & sad[1])
+				t.max = max(t.max, sad_max_channels(sad));
+	}
+
+	return snd_interval_refine(c, &t);
+}
+
+int snd_pcm_hw_constraint_eld(struct snd_pcm_runtime *runtime, void *eld)
+{
+	int ret;
+
+	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+				  eld_limit_rates, eld,
+				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+	if (ret < 0)
+		return ret;
+
+	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+				  eld_limit_channels, eld,
+				  SNDRV_PCM_HW_PARAM_RATE, -1);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(snd_pcm_hw_constraint_eld);

sound/core/pcm_iec958.c

+/*
+ *  PCM DRM helpers
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License version 2 as
+ *   published by the Free Software Foundation.
+ */
+#include <linux/export.h>
+#include <linux/types.h>
+#include <sound/asoundef.h>
+#include <sound/pcm.h>
+#include <sound/pcm_iec958.h>
+
+/**
+ * snd_pcm_create_iec958_consumer - create consumer format IEC958 channel status
+ * @runtime: pcm runtime structure with ->rate filled in
+ * @cs: channel status buffer, at least four bytes
+ * @len: length of channel status buffer
+ *
+ * Create the consumer format channel status data in @cs of maximum size
+ * @len corresponding to the parameters of the PCM runtime @runtime.
+ *
+ * Drivers may wish to tweak the contents of the buffer after creation.
+ *
+ * Returns: length of buffer, or negative error code if something failed.
+ */
+int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
+	size_t len)
+{
+	unsigned int fs, ws;
+
+	if (len < 4)
+		return -EINVAL;
+
+	switch (runtime->rate) {
+	case 32000:
+		fs = IEC958_AES3_CON_FS_32000;
+		break;
+	case 44100:
+		fs = IEC958_AES3_CON_FS_44100;
+		break;
+	case 48000:
+		fs = IEC958_AES3_CON_FS_48000;
+		break;
+	case 88200:
+		fs = IEC958_AES3_CON_FS_88200;
+		break;
+	case 96000:
+		fs = IEC958_AES3_CON_FS_96000;
+		break;
+	case 176400:
+		fs = IEC958_AES3_CON_FS_176400;
+		break;
+	case 192000:
+		fs = IEC958_AES3_CON_FS_192000;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (len > 4) {
+		switch (snd_pcm_format_width(runtime->format)) {
+		case 16:
+			ws = IEC958_AES4_CON_WORDLEN_20_16;
+			break;
+		case 18:
+			ws = IEC958_AES4_CON_WORDLEN_22_18;
+			break;
+		case 20:
+			ws = IEC958_AES4_CON_WORDLEN_20_16 |
+			     IEC958_AES4_CON_MAX_WORDLEN_24;
+			break;
+		case 24:
+			ws = IEC958_AES4_CON_WORDLEN_24_20 |
+			     IEC958_AES4_CON_MAX_WORDLEN_24;
+			break;
+
+		default:
+			return -EINVAL;
+		}
+	}
+
+	memset(cs, 0, len);
+
+	cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE;
+	cs[1] = IEC958_AES1_CON_GENERAL;
+	cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC;
+	cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | fs;
+
+	if (len > 4)
+		cs[4] = ws;
+
+	return len;
+}
+EXPORT_SYMBOL(snd_pcm_create_iec958_consumer);