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 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 47 static bool pcm1789_writeable_reg(struct device *dev, unsigned int reg) 48 { 49 return pcm1789_accessible_reg(dev, reg); 50 } 51 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 63 static int pcm1789_mute(struct snd_soc_dai *codec_dai, int mute, int direction) 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 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 } 130 131 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 } 142 143 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 .mute_stream = pcm1789_mute, 171 .trigger = pcm1789_trigger, 172 .no_capture_mute = 1, 173 }; 174 175 static const DECLARE_TLV_DB_SCALE(pcm1789_dac_tlv, -12000, 50, 1); 176 177 static const struct snd_kcontrol_new pcm1789_controls[] = { 178 SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM1789_DAC_VOL_LEFT, 179 PCM1789_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0, 180 pcm1789_dac_tlv), 181 }; 182 183 static const struct snd_soc_dapm_widget pcm1789_dapm_widgets[] = { 184 SND_SOC_DAPM_OUTPUT("IOUTL+"), 185 SND_SOC_DAPM_OUTPUT("IOUTL-"), 186 SND_SOC_DAPM_OUTPUT("IOUTR+"), 187 SND_SOC_DAPM_OUTPUT("IOUTR-"), 188 }; 189 190 static const struct snd_soc_dapm_route pcm1789_dapm_routes[] = { 191 { "IOUTL+", NULL, "Playback" }, 192 { "IOUTL-", NULL, "Playback" }, 193 { "IOUTR+", NULL, "Playback" }, 194 { "IOUTR-", NULL, "Playback" }, 195 }; 196 197 static struct snd_soc_dai_driver pcm1789_dai = { 198 .name = "pcm1789-hifi", 199 .playback = { 200 .stream_name = "Playback", 201 .channels_min = 2, 202 .channels_max = 2, 203 .rates = SNDRV_PCM_RATE_CONTINUOUS, 204 .rate_min = 10000, 205 .rate_max = 200000, 206 .formats = PCM1789_FORMATS, 207 }, 208 .ops = &pcm1789_dai_ops, 209 }; 210 211 const struct regmap_config pcm1789_regmap_config = { 212 .reg_bits = 8, 213 .val_bits = 8, 214 .max_register = PCM1789_DAC_VOL_RIGHT, 215 .reg_defaults = pcm1789_reg_defaults, 216 .num_reg_defaults = ARRAY_SIZE(pcm1789_reg_defaults), 217 .writeable_reg = pcm1789_writeable_reg, 218 .readable_reg = pcm1789_accessible_reg, 219 }; 220 EXPORT_SYMBOL_GPL(pcm1789_regmap_config); 221 222 static const struct snd_soc_component_driver soc_component_dev_pcm1789 = { 223 .controls = pcm1789_controls, 224 .num_controls = ARRAY_SIZE(pcm1789_controls), 225 .dapm_widgets = pcm1789_dapm_widgets, 226 .num_dapm_widgets = ARRAY_SIZE(pcm1789_dapm_widgets), 227 .dapm_routes = pcm1789_dapm_routes, 228 .num_dapm_routes = ARRAY_SIZE(pcm1789_dapm_routes), 229 .idle_bias_on = 1, 230 .use_pmdown_time = 1, 231 .endianness = 1, 232 }; 233 234 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); 260 261 void pcm1789_common_exit(struct device *dev) 262 { 263 struct pcm1789_private *priv = dev_get_drvdata(dev); 264 265 flush_work(&priv->work); 266 } 267 EXPORT_SYMBOL_GPL(pcm1789_common_exit); 268 269 MODULE_DESCRIPTION("ASoC PCM1789 driver"); 270 MODULE_AUTHOR("Mylène Josserand <mylene.josserand@free-electrons.com>"); 271 MODULE_LICENSE("GPL"); 272