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 20 int 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 } 36 EXPORT_SYMBOL_NS(asoc_sdw_cs35l56_volume_limit, "SND_SOC_SDW_UTILS"); 37 38 int 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 } 65 EXPORT_SYMBOL_NS(asoc_sdw_cs_spk_rtd_init, "SND_SOC_SDW_UTILS"); 66 67 int 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 } 110 EXPORT_SYMBOL_NS(asoc_sdw_cs_spk_feedback_rtd_init, "SND_SOC_SDW_UTILS"); 111 112 int 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 } 125 EXPORT_SYMBOL_NS(asoc_sdw_cs_amp_init, "SND_SOC_SDW_UTILS"); 126