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