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 CODEC_NAME_SIZE 8
18 #define CS_AMP_CHANNELS_PER_AMP 4
19 #define CS35L56_SPK_VOLUME_0DB 400 /* 0dB Max */
20
asoc_sdw_cs35l56_volume_limit(struct snd_soc_card * card,const char * name_prefix)21 int asoc_sdw_cs35l56_volume_limit(struct snd_soc_card *card, const char *name_prefix)
22 {
23 char *volume_ctl_name;
24 int ret;
25
26 volume_ctl_name = kasprintf(GFP_KERNEL, "%s Speaker Volume", name_prefix);
27 if (!volume_ctl_name)
28 return -ENOMEM;
29
30 ret = snd_soc_limit_volume(card, volume_ctl_name, CS35L56_SPK_VOLUME_0DB);
31 if (ret)
32 dev_err(card->dev, "%s limit set failed: %d\n", volume_ctl_name, ret);
33
34 kfree(volume_ctl_name);
35 return ret;
36 }
37 EXPORT_SYMBOL_NS(asoc_sdw_cs35l56_volume_limit, "SND_SOC_SDW_UTILS");
38
asoc_sdw_cs_spk_rtd_init(struct snd_soc_pcm_runtime * rtd,struct snd_soc_dai * dai)39 int asoc_sdw_cs_spk_rtd_init(struct snd_soc_pcm_runtime *rtd, struct snd_soc_dai *dai)
40 {
41 const char *dai_name = rtd->dai_link->codecs->dai_name;
42 struct snd_soc_card *card = rtd->card;
43 char codec_name[CODEC_NAME_SIZE];
44 char widget_name[16];
45 struct snd_soc_dapm_route route = { "Speaker", NULL, widget_name };
46 struct snd_soc_dai *codec_dai;
47 int i, ret;
48
49 snprintf(codec_name, CODEC_NAME_SIZE, "%s", dai_name);
50 card->components = devm_kasprintf(card->dev, GFP_KERNEL,
51 "%s spk:%s",
52 card->components, codec_name);
53 if (!card->components)
54 return -ENOMEM;
55
56 for_each_rtd_codec_dais(rtd, i, codec_dai) {
57 if (!strstr(codec_dai->name, "cs35l56"))
58 continue;
59
60 snprintf(widget_name, sizeof(widget_name), "%s SPK",
61 codec_dai->component->name_prefix);
62
63 ret = asoc_sdw_cs35l56_volume_limit(card, codec_dai->component->name_prefix);
64 if (ret)
65 return ret;
66
67 ret = snd_soc_dapm_add_routes(&card->dapm, &route, 1);
68 if (ret)
69 return ret;
70 }
71
72 return 0;
73 }
74 EXPORT_SYMBOL_NS(asoc_sdw_cs_spk_rtd_init, "SND_SOC_SDW_UTILS");
75
asoc_sdw_cs_spk_feedback_rtd_init(struct snd_soc_pcm_runtime * rtd,struct snd_soc_dai * dai)76 int asoc_sdw_cs_spk_feedback_rtd_init(struct snd_soc_pcm_runtime *rtd, struct snd_soc_dai *dai)
77 {
78 const struct snd_soc_dai_link *dai_link = rtd->dai_link;
79 const struct snd_soc_dai_link_ch_map *ch_map;
80 const struct snd_soc_dai_link_component *codec_dlc;
81 struct snd_soc_dai *codec_dai;
82 u8 ch_slot[8] = {};
83 unsigned int amps_per_bus, ch_per_amp, mask;
84 int i, ret;
85
86 WARN_ON(dai_link->num_cpus > ARRAY_SIZE(ch_slot));
87
88 /*
89 * CS35L56 has 4 TX channels. When the capture is aggregated the
90 * same bus slots will be allocated to all the amps on a bus. Only
91 * one amp on that bus can be transmitting in each slot so divide
92 * the available 4 slots between all the amps on a bus.
93 */
94 amps_per_bus = dai_link->num_codecs / dai_link->num_cpus;
95 if ((amps_per_bus == 0) || (amps_per_bus > CS_AMP_CHANNELS_PER_AMP)) {
96 dev_err(rtd->card->dev, "Illegal num_codecs:%u / num_cpus:%u\n",
97 dai_link->num_codecs, dai_link->num_cpus);
98 return -EINVAL;
99 }
100
101 ch_per_amp = CS_AMP_CHANNELS_PER_AMP / amps_per_bus;
102
103 for_each_rtd_ch_maps(rtd, i, ch_map) {
104 codec_dlc = snd_soc_link_to_codec(rtd->dai_link, i);
105 codec_dai = snd_soc_find_dai(codec_dlc);
106 mask = GENMASK(ch_per_amp - 1, 0) << ch_slot[ch_map->cpu];
107
108 ret = snd_soc_dai_set_tdm_slot(codec_dai, 0, mask, 4, 32);
109 if (ret < 0) {
110 dev_err(rtd->card->dev, "Failed to set TDM slot:%d\n", ret);
111 return ret;
112 }
113
114 ch_slot[ch_map->cpu] += ch_per_amp;
115 }
116
117 return 0;
118 }
119 EXPORT_SYMBOL_NS(asoc_sdw_cs_spk_feedback_rtd_init, "SND_SOC_SDW_UTILS");
120
asoc_sdw_cs_amp_init(struct snd_soc_card * card,struct snd_soc_dai_link * dai_links,struct asoc_sdw_codec_info * info,bool playback)121 int asoc_sdw_cs_amp_init(struct snd_soc_card *card,
122 struct snd_soc_dai_link *dai_links,
123 struct asoc_sdw_codec_info *info,
124 bool playback)
125 {
126 /* Do init on playback link only. */
127 if (!playback)
128 return 0;
129
130 info->amp_num++;
131
132 return 0;
133 }
134 EXPORT_SYMBOL_NS(asoc_sdw_cs_amp_init, "SND_SOC_SDW_UTILS");
135