soc_sdw_cs_amp.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2// This file incorporates work covered by the following copyright notice:
  3// Copyright (c) 2023 Intel Corporation
  4// Copyright (c) 2024 Advanced Micro Devices, Inc.
  5
  6/*
  7 *  soc_sdw_cs_amp - Helpers to handle CS35L56 from generic machine driver
  8 */
  9
 10#include <linux/device.h>
 11#include <linux/errno.h>
 12#include <sound/soc.h>
 13#include <sound/soc-acpi.h>
 14#include <sound/soc-dai.h>
 15#include <sound/soc_sdw_utils.h>
 16
 17#define CS_AMP_CHANNELS_PER_AMP	4
 18#define CS35L56_SPK_VOLUME_0DB 400 /* 0dB Max */
 19
 20int asoc_sdw_cs35l56_volume_limit(struct snd_soc_card *card, const char *name_prefix)
 21{
 22	char *volume_ctl_name;
 23	int ret;
 24
 25	volume_ctl_name = kasprintf(GFP_KERNEL, "%s Speaker Volume", name_prefix);
 26	if (!volume_ctl_name)
 27		return -ENOMEM;
 28
 29	ret = snd_soc_limit_volume(card, volume_ctl_name, CS35L56_SPK_VOLUME_0DB);
 30	if (ret)
 31		dev_err(card->dev, "%s limit set failed: %d\n", volume_ctl_name, ret);
 32
 33	kfree(volume_ctl_name);
 34	return ret;
 35}
 36EXPORT_SYMBOL_NS(asoc_sdw_cs35l56_volume_limit, "SND_SOC_SDW_UTILS");
 37
 38int asoc_sdw_cs_spk_rtd_init(struct snd_soc_pcm_runtime *rtd, struct snd_soc_dai *dai)
 39{
 40	struct snd_soc_card *card = rtd->card;
 41	struct snd_soc_dapm_context *dapm = snd_soc_card_to_dapm(card);
 42	char widget_name[16];
 43	struct snd_soc_dapm_route route = { "Speaker", NULL, widget_name };
 44	struct snd_soc_dai *codec_dai;
 45	int i, ret;
 46
 47	for_each_rtd_codec_dais(rtd, i, codec_dai) {
 48		if (!strstr(codec_dai->name, "cs35l56"))
 49			continue;
 50
 51		snprintf(widget_name, sizeof(widget_name), "%s SPK",
 52			 codec_dai->component->name_prefix);
 53
 54		ret = asoc_sdw_cs35l56_volume_limit(card, codec_dai->component->name_prefix);
 55		if (ret)
 56			return ret;
 57
 58		ret = snd_soc_dapm_add_routes(dapm, &route, 1);
 59		if (ret)
 60			return ret;
 61	}
 62
 63	return 0;
 64}
 65EXPORT_SYMBOL_NS(asoc_sdw_cs_spk_rtd_init, "SND_SOC_SDW_UTILS");
 66
 67int asoc_sdw_cs_spk_feedback_rtd_init(struct snd_soc_pcm_runtime *rtd, struct snd_soc_dai *dai)
 68{
 69	const struct snd_soc_dai_link *dai_link = rtd->dai_link;
 70	const struct snd_soc_dai_link_ch_map *ch_map;
 71	const struct snd_soc_dai_link_component *codec_dlc;
 72	struct snd_soc_dai *codec_dai;
 73	u8 ch_slot[8] = {};
 74	unsigned int amps_per_bus, ch_per_amp, mask;
 75	int i, ret;
 76
 77	WARN_ON(dai_link->num_cpus > ARRAY_SIZE(ch_slot));
 78
 79	/*
 80	 * CS35L56 has 4 TX channels. When the capture is aggregated the
 81	 * same bus slots will be allocated to all the amps on a bus. Only
 82	 * one amp on that bus can be transmitting in each slot so divide
 83	 * the available 4 slots between all the amps on a bus.
 84	 */
 85	amps_per_bus = dai_link->num_codecs / dai_link->num_cpus;
 86	if ((amps_per_bus == 0) || (amps_per_bus > CS_AMP_CHANNELS_PER_AMP)) {
 87		dev_err(rtd->card->dev, "Illegal num_codecs:%u / num_cpus:%u\n",
 88			dai_link->num_codecs, dai_link->num_cpus);
 89		return -EINVAL;
 90	}
 91
 92	ch_per_amp = CS_AMP_CHANNELS_PER_AMP / amps_per_bus;
 93
 94	for_each_rtd_ch_maps(rtd, i, ch_map) {
 95		codec_dlc = snd_soc_link_to_codec(rtd->dai_link, i);
 96		codec_dai = snd_soc_find_dai(codec_dlc);
 97		mask = GENMASK(ch_per_amp - 1, 0) << ch_slot[ch_map->cpu];
 98
 99		ret = snd_soc_dai_set_tdm_slot(codec_dai, 0, mask, 4, 32);
100		if (ret < 0) {
101			dev_err(rtd->card->dev, "Failed to set TDM slot:%d\n", ret);
102			return ret;
103		}
104
105		ch_slot[ch_map->cpu] += ch_per_amp;
106	}
107
108	return 0;
109}
110EXPORT_SYMBOL_NS(asoc_sdw_cs_spk_feedback_rtd_init, "SND_SOC_SDW_UTILS");
111
112int asoc_sdw_cs_amp_init(struct snd_soc_card *card,
113			 struct snd_soc_dai_link *dai_links,
114			 struct asoc_sdw_codec_info *info,
115			 bool playback)
116{
117	/* Do init on playback link only. */
118	if (!playback)
119		return 0;
120
121	info->amp_num++;
122
123	return 0;
124}
125EXPORT_SYMBOL_NS(asoc_sdw_cs_amp_init, "SND_SOC_SDW_UTILS");