1 // SPDX-License-Identifier: GPL-2.0
2 // Audio driver for PCM1789
3 // Copyright (C) 2018 Bootlin
4 // Mylène Josserand <mylene.josserand@bootlin.com>
5
6 #include <linux/gpio/consumer.h>
7 #include <linux/module.h>
8 #include <linux/workqueue.h>
9
10 #include <sound/pcm_params.h>
11 #include <sound/soc.h>
12 #include <sound/tlv.h>
13
14 #include "pcm1789.h"
15
16 #define PCM1789_MUTE_CONTROL 0x10
17 #define PCM1789_FMT_CONTROL 0x11
18 #define PCM1789_SOFT_MUTE 0x14
19 #define PCM1789_DAC_VOL_LEFT 0x18
20 #define PCM1789_DAC_VOL_RIGHT 0x19
21
22 #define PCM1789_FMT_MASK 0x07
23 #define PCM1789_MUTE_MASK 0x03
24 #define PCM1789_MUTE_SRET 0x06
25
26 struct pcm1789_private {
27 struct regmap *regmap;
28 unsigned int format;
29 unsigned int rate;
30 struct gpio_desc *reset;
31 struct work_struct work;
32 struct device *dev;
33 };
34
35 static const struct reg_default pcm1789_reg_defaults[] = {
36 { PCM1789_FMT_CONTROL, 0x00 },
37 { PCM1789_SOFT_MUTE, 0x00 },
38 { PCM1789_DAC_VOL_LEFT, 0xff },
39 { PCM1789_DAC_VOL_RIGHT, 0xff },
40 };
41
pcm1789_accessible_reg(struct device * dev,unsigned int reg)42 static bool pcm1789_accessible_reg(struct device *dev, unsigned int reg)
43 {
44 return reg >= PCM1789_MUTE_CONTROL && reg <= PCM1789_DAC_VOL_RIGHT;
45 }
46
pcm1789_writeable_reg(struct device * dev,unsigned int reg)47 static bool pcm1789_writeable_reg(struct device *dev, unsigned int reg)
48 {
49 return pcm1789_accessible_reg(dev, reg);
50 }
51
pcm1789_set_dai_fmt(struct snd_soc_dai * codec_dai,unsigned int format)52 static int pcm1789_set_dai_fmt(struct snd_soc_dai *codec_dai,
53 unsigned int format)
54 {
55 struct snd_soc_component *component = codec_dai->component;
56 struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
57
58 priv->format = format;
59
60 return 0;
61 }
62
pcm1789_digital_mute(struct snd_soc_dai * codec_dai,int mute)63 static int pcm1789_digital_mute(struct snd_soc_dai *codec_dai, int mute)
64 {
65 struct snd_soc_component *component = codec_dai->component;
66 struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
67
68 return regmap_update_bits(priv->regmap, PCM1789_SOFT_MUTE,
69 PCM1789_MUTE_MASK,
70 mute ? 0 : PCM1789_MUTE_MASK);
71 }
72
pcm1789_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * codec_dai)73 static int pcm1789_hw_params(struct snd_pcm_substream *substream,
74 struct snd_pcm_hw_params *params,
75 struct snd_soc_dai *codec_dai)
76 {
77 struct snd_soc_component *component = codec_dai->component;
78 struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
79 int val = 0, ret;
80
81 priv->rate = params_rate(params);
82
83 switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
84 case SND_SOC_DAIFMT_RIGHT_J:
85 switch (params_width(params)) {
86 case 24:
87 val = 2;
88 break;
89 case 16:
90 val = 3;
91 break;
92 default:
93 return -EINVAL;
94 }
95 break;
96 case SND_SOC_DAIFMT_I2S:
97 switch (params_width(params)) {
98 case 16:
99 case 24:
100 case 32:
101 val = 0;
102 break;
103 default:
104 return -EINVAL;
105 }
106 break;
107 case SND_SOC_DAIFMT_LEFT_J:
108 switch (params_width(params)) {
109 case 16:
110 case 24:
111 case 32:
112 val = 1;
113 break;
114 default:
115 return -EINVAL;
116 }
117 break;
118 default:
119 dev_err(component->dev, "Invalid DAI format\n");
120 return -EINVAL;
121 }
122
123 ret = regmap_update_bits(priv->regmap, PCM1789_FMT_CONTROL,
124 PCM1789_FMT_MASK, val);
125 if (ret < 0)
126 return ret;
127
128 return 0;
129 }
130
pcm1789_work_queue(struct work_struct * work)131 static void pcm1789_work_queue(struct work_struct *work)
132 {
133 struct pcm1789_private *priv = container_of(work,
134 struct pcm1789_private,
135 work);
136
137 /* Perform a software reset to remove codec from desynchronized state */
138 if (regmap_update_bits(priv->regmap, PCM1789_MUTE_CONTROL,
139 0x3 << PCM1789_MUTE_SRET, 0) < 0)
140 dev_err(priv->dev, "Error while setting SRET");
141 }
142
pcm1789_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)143 static int pcm1789_trigger(struct snd_pcm_substream *substream, int cmd,
144 struct snd_soc_dai *dai)
145 {
146 struct snd_soc_component *component = dai->component;
147 struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
148 int ret = 0;
149
150 switch (cmd) {
151 case SNDRV_PCM_TRIGGER_START:
152 case SNDRV_PCM_TRIGGER_RESUME:
153 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
154 schedule_work(&priv->work);
155 break;
156 case SNDRV_PCM_TRIGGER_STOP:
157 case SNDRV_PCM_TRIGGER_SUSPEND:
158 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
159 break;
160 default:
161 ret = -EINVAL;
162 }
163
164 return ret;
165 }
166
167 static const struct snd_soc_dai_ops pcm1789_dai_ops = {
168 .set_fmt = pcm1789_set_dai_fmt,
169 .hw_params = pcm1789_hw_params,
170 .digital_mute = pcm1789_digital_mute,
171 .trigger = pcm1789_trigger,
172 };
173
174 static const DECLARE_TLV_DB_SCALE(pcm1789_dac_tlv, -12000, 50, 1);
175
176 static const struct snd_kcontrol_new pcm1789_controls[] = {
177 SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM1789_DAC_VOL_LEFT,
178 PCM1789_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0,
179 pcm1789_dac_tlv),
180 };
181
182 static const struct snd_soc_dapm_widget pcm1789_dapm_widgets[] = {
183 SND_SOC_DAPM_OUTPUT("IOUTL+"),
184 SND_SOC_DAPM_OUTPUT("IOUTL-"),
185 SND_SOC_DAPM_OUTPUT("IOUTR+"),
186 SND_SOC_DAPM_OUTPUT("IOUTR-"),
187 };
188
189 static const struct snd_soc_dapm_route pcm1789_dapm_routes[] = {
190 { "IOUTL+", NULL, "Playback" },
191 { "IOUTL-", NULL, "Playback" },
192 { "IOUTR+", NULL, "Playback" },
193 { "IOUTR-", NULL, "Playback" },
194 };
195
196 static struct snd_soc_dai_driver pcm1789_dai = {
197 .name = "pcm1789-hifi",
198 .playback = {
199 .stream_name = "Playback",
200 .channels_min = 2,
201 .channels_max = 2,
202 .rates = SNDRV_PCM_RATE_CONTINUOUS,
203 .rate_min = 10000,
204 .rate_max = 200000,
205 .formats = PCM1789_FORMATS,
206 },
207 .ops = &pcm1789_dai_ops,
208 };
209
210 const struct regmap_config pcm1789_regmap_config = {
211 .reg_bits = 8,
212 .val_bits = 8,
213 .max_register = PCM1789_DAC_VOL_RIGHT,
214 .reg_defaults = pcm1789_reg_defaults,
215 .num_reg_defaults = ARRAY_SIZE(pcm1789_reg_defaults),
216 .writeable_reg = pcm1789_writeable_reg,
217 .readable_reg = pcm1789_accessible_reg,
218 };
219 EXPORT_SYMBOL_GPL(pcm1789_regmap_config);
220
221 static const struct snd_soc_component_driver soc_component_dev_pcm1789 = {
222 .controls = pcm1789_controls,
223 .num_controls = ARRAY_SIZE(pcm1789_controls),
224 .dapm_widgets = pcm1789_dapm_widgets,
225 .num_dapm_widgets = ARRAY_SIZE(pcm1789_dapm_widgets),
226 .dapm_routes = pcm1789_dapm_routes,
227 .num_dapm_routes = ARRAY_SIZE(pcm1789_dapm_routes),
228 .idle_bias_on = 1,
229 .use_pmdown_time = 1,
230 .endianness = 1,
231 .non_legacy_dai_naming = 1,
232 };
233
pcm1789_common_init(struct device * dev,struct regmap * regmap)234 int pcm1789_common_init(struct device *dev, struct regmap *regmap)
235 {
236 struct pcm1789_private *pcm1789;
237
238 pcm1789 = devm_kzalloc(dev, sizeof(struct pcm1789_private),
239 GFP_KERNEL);
240 if (!pcm1789)
241 return -ENOMEM;
242
243 pcm1789->regmap = regmap;
244 pcm1789->dev = dev;
245 dev_set_drvdata(dev, pcm1789);
246
247 pcm1789->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
248 if (IS_ERR(pcm1789->reset))
249 return PTR_ERR(pcm1789->reset);
250
251 gpiod_set_value_cansleep(pcm1789->reset, 0);
252 msleep(300);
253
254 INIT_WORK(&pcm1789->work, pcm1789_work_queue);
255
256 return devm_snd_soc_register_component(dev, &soc_component_dev_pcm1789,
257 &pcm1789_dai, 1);
258 }
259 EXPORT_SYMBOL_GPL(pcm1789_common_init);
260
pcm1789_common_exit(struct device * dev)261 int pcm1789_common_exit(struct device *dev)
262 {
263 struct pcm1789_private *priv = dev_get_drvdata(dev);
264
265 flush_work(&priv->work);
266
267 return 0;
268 }
269 EXPORT_SYMBOL_GPL(pcm1789_common_exit);
270
271 MODULE_DESCRIPTION("ASoC PCM1789 driver");
272 MODULE_AUTHOR("Mylène Josserand <mylene.josserand@free-electrons.com>");
273 MODULE_LICENSE("GPL");
274
