1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (c) 2020 BayLibre, SAS.
4 // Author: Jerome Brunet <jbrunet@baylibre.com>
5 
6 #include <linux/bitfield.h>
7 #include <sound/pcm_params.h>
8 #include <sound/soc.h>
9 #include <sound/soc-dai.h>
10 
11 #include <dt-bindings/sound/meson-aiu.h>
12 #include "aiu.h"
13 #include "meson-codec-glue.h"
14 
15 #define CTRL_DIN_EN			15
16 #define CTRL_CLK_INV			BIT(14)
17 #define CTRL_LRCLK_INV			BIT(13)
18 #define CTRL_I2S_IN_BCLK_SRC		BIT(11)
19 #define CTRL_DIN_LRCLK_SRC_SHIFT	6
20 #define CTRL_DIN_LRCLK_SRC		(0x3 << CTRL_DIN_LRCLK_SRC_SHIFT)
21 #define CTRL_BCLK_MCLK_SRC		GENMASK(5, 4)
22 #define CTRL_DIN_SKEW			GENMASK(3, 2)
23 #define CTRL_I2S_OUT_LANE_SRC		0
24 
25 #define AIU_ACODEC_OUT_CHMAX		2
26 
27 static const char * const aiu_acodec_ctrl_mux_texts[] = {
28 	"DISABLED", "I2S", "PCM",
29 };
30 
31 static int aiu_acodec_ctrl_mux_put_enum(struct snd_kcontrol *kcontrol,
32 					struct snd_ctl_elem_value *ucontrol)
33 {
34 	struct snd_soc_component *component =
35 		snd_soc_dapm_kcontrol_component(kcontrol);
36 	struct snd_soc_dapm_context *dapm =
37 		snd_soc_dapm_kcontrol_dapm(kcontrol);
38 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
39 	unsigned int mux, changed;
40 
41 	mux = snd_soc_enum_item_to_val(e, ucontrol->value.enumerated.item[0]);
42 	changed = snd_soc_component_test_bits(component, e->reg,
43 					      CTRL_DIN_LRCLK_SRC,
44 					      FIELD_PREP(CTRL_DIN_LRCLK_SRC,
45 							 mux));
46 
47 	if (!changed)
48 		return 0;
49 
50 	/* Force disconnect of the mux while updating */
51 	snd_soc_dapm_mux_update_power(dapm, kcontrol, 0, NULL, NULL);
52 
53 	snd_soc_component_update_bits(component, e->reg,
54 				      CTRL_DIN_LRCLK_SRC |
55 				      CTRL_BCLK_MCLK_SRC,
56 				      FIELD_PREP(CTRL_DIN_LRCLK_SRC, mux) |
57 				      FIELD_PREP(CTRL_BCLK_MCLK_SRC, mux));
58 
59 	snd_soc_dapm_mux_update_power(dapm, kcontrol, mux, e, NULL);
60 
61 	return 1;
62 }
63 
64 static SOC_ENUM_SINGLE_DECL(aiu_acodec_ctrl_mux_enum, AIU_ACODEC_CTRL,
65 			    CTRL_DIN_LRCLK_SRC_SHIFT,
66 			    aiu_acodec_ctrl_mux_texts);
67 
68 static const struct snd_kcontrol_new aiu_acodec_ctrl_mux =
69 	SOC_DAPM_ENUM_EXT("ACodec Source", aiu_acodec_ctrl_mux_enum,
70 			  snd_soc_dapm_get_enum_double,
71 			  aiu_acodec_ctrl_mux_put_enum);
72 
73 static const struct snd_kcontrol_new aiu_acodec_ctrl_out_enable =
74 	SOC_DAPM_SINGLE_AUTODISABLE("Switch", AIU_ACODEC_CTRL,
75 				    CTRL_DIN_EN, 1, 0);
76 
77 static const struct snd_soc_dapm_widget aiu_acodec_ctrl_widgets[] = {
78 	SND_SOC_DAPM_MUX("ACODEC SRC", SND_SOC_NOPM, 0, 0,
79 			 &aiu_acodec_ctrl_mux),
80 	SND_SOC_DAPM_SWITCH("ACODEC OUT EN", SND_SOC_NOPM, 0, 0,
81 			    &aiu_acodec_ctrl_out_enable),
82 };
83 
84 static int aiu_acodec_ctrl_input_hw_params(struct snd_pcm_substream *substream,
85 					   struct snd_pcm_hw_params *params,
86 					   struct snd_soc_dai *dai)
87 {
88 	struct meson_codec_glue_input *data;
89 	int ret;
90 
91 	ret = meson_codec_glue_input_hw_params(substream, params, dai);
92 	if (ret)
93 		return ret;
94 
95 	/* The glue will provide 1 lane out of the 4 to the output */
96 	data = meson_codec_glue_input_get_data(dai);
97 	data->params.channels_min = min_t(unsigned int, AIU_ACODEC_OUT_CHMAX,
98 					  data->params.channels_min);
99 	data->params.channels_max = min_t(unsigned int, AIU_ACODEC_OUT_CHMAX,
100 					  data->params.channels_max);
101 
102 	return 0;
103 }
104 
105 static const struct snd_soc_dai_ops aiu_acodec_ctrl_input_ops = {
106 	.hw_params	= aiu_acodec_ctrl_input_hw_params,
107 	.set_fmt	= meson_codec_glue_input_set_fmt,
108 };
109 
110 static const struct snd_soc_dai_ops aiu_acodec_ctrl_output_ops = {
111 	.startup	= meson_codec_glue_output_startup,
112 };
113 
114 #define AIU_ACODEC_CTRL_FORMATS					\
115 	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |	\
116 	 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_LE |	\
117 	 SNDRV_PCM_FMTBIT_S32_LE)
118 
119 #define AIU_ACODEC_STREAM(xname, xsuffix, xchmax)		\
120 {								\
121 	.stream_name	= xname " " xsuffix,			\
122 	.channels_min	= 1,					\
123 	.channels_max	= (xchmax),				\
124 	.rate_min       = 5512,					\
125 	.rate_max	= 192000,				\
126 	.formats	= AIU_ACODEC_CTRL_FORMATS,		\
127 }
128 
129 #define AIU_ACODEC_INPUT(xname) {				\
130 	.name = "ACODEC CTRL " xname,				\
131 	.playback = AIU_ACODEC_STREAM(xname, "Playback", 8),	\
132 	.ops = &aiu_acodec_ctrl_input_ops,			\
133 	.probe = meson_codec_glue_input_dai_probe,		\
134 	.remove = meson_codec_glue_input_dai_remove,		\
135 }
136 
137 #define AIU_ACODEC_OUTPUT(xname) {				\
138 	.name = "ACODEC CTRL " xname,				\
139 	.capture = AIU_ACODEC_STREAM(xname, "Capture", AIU_ACODEC_OUT_CHMAX), \
140 	.ops = &aiu_acodec_ctrl_output_ops,			\
141 }
142 
143 static struct snd_soc_dai_driver aiu_acodec_ctrl_dai_drv[] = {
144 	[CTRL_I2S] = AIU_ACODEC_INPUT("ACODEC I2S IN"),
145 	[CTRL_PCM] = AIU_ACODEC_INPUT("ACODEC PCM IN"),
146 	[CTRL_OUT] = AIU_ACODEC_OUTPUT("ACODEC OUT"),
147 };
148 
149 static const struct snd_soc_dapm_route aiu_acodec_ctrl_routes[] = {
150 	{ "ACODEC SRC", "I2S", "ACODEC I2S IN Playback" },
151 	{ "ACODEC SRC", "PCM", "ACODEC PCM IN Playback" },
152 	{ "ACODEC OUT EN", "Switch", "ACODEC SRC" },
153 	{ "ACODEC OUT Capture", NULL, "ACODEC OUT EN" },
154 };
155 
156 static const struct snd_kcontrol_new aiu_acodec_ctrl_controls[] = {
157 	SOC_SINGLE("ACODEC I2S Lane Select", AIU_ACODEC_CTRL,
158 		   CTRL_I2S_OUT_LANE_SRC, 3, 0),
159 };
160 
161 static int aiu_acodec_of_xlate_dai_name(struct snd_soc_component *component,
162 					const struct of_phandle_args *args,
163 					const char **dai_name)
164 {
165 	return aiu_of_xlate_dai_name(component, args, dai_name, AIU_ACODEC);
166 }
167 
168 static int aiu_acodec_ctrl_component_probe(struct snd_soc_component *component)
169 {
170 	/*
171 	 * NOTE: Din Skew setting
172 	 * According to the documentation, the following update adds one delay
173 	 * to the din line. Without this, the output saturates. This happens
174 	 * regardless of the link format (i2s or left_j) so it is not clear what
175 	 * it actually does but it seems to be required
176 	 */
177 	snd_soc_component_update_bits(component, AIU_ACODEC_CTRL,
178 				      CTRL_DIN_SKEW,
179 				      FIELD_PREP(CTRL_DIN_SKEW, 2));
180 
181 	return 0;
182 }
183 
184 static const struct snd_soc_component_driver aiu_acodec_ctrl_component = {
185 	.name			= "AIU Internal DAC Codec Control",
186 	.probe			= aiu_acodec_ctrl_component_probe,
187 	.controls		= aiu_acodec_ctrl_controls,
188 	.num_controls		= ARRAY_SIZE(aiu_acodec_ctrl_controls),
189 	.dapm_widgets		= aiu_acodec_ctrl_widgets,
190 	.num_dapm_widgets	= ARRAY_SIZE(aiu_acodec_ctrl_widgets),
191 	.dapm_routes		= aiu_acodec_ctrl_routes,
192 	.num_dapm_routes	= ARRAY_SIZE(aiu_acodec_ctrl_routes),
193 	.of_xlate_dai_name	= aiu_acodec_of_xlate_dai_name,
194 	.endianness		= 1,
195 #ifdef CONFIG_DEBUG_FS
196 	.debugfs_prefix		= "acodec",
197 #endif
198 };
199 
200 int aiu_acodec_ctrl_register_component(struct device *dev)
201 {
202 	return snd_soc_register_component(dev, &aiu_acodec_ctrl_component,
203 					  aiu_acodec_ctrl_dai_drv,
204 					  ARRAY_SIZE(aiu_acodec_ctrl_dai_drv));
205 }
206