348 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * wm8728.c -- WM8728 ALSA SoC Audio driver4 *5 * Copyright 2008 Wolfson Microelectronics plc6 *7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>8 */9 10#include <linux/mod_devicetable.h>11#include <linux/module.h>12#include <linux/moduleparam.h>13#include <linux/init.h>14#include <linux/delay.h>15#include <linux/pm.h>16#include <linux/i2c.h>17#include <linux/platform_device.h>18#include <linux/regmap.h>19#include <linux/spi/spi.h>20#include <linux/slab.h>21#include <sound/core.h>22#include <sound/pcm.h>23#include <sound/pcm_params.h>24#include <sound/soc.h>25#include <sound/initval.h>26#include <sound/tlv.h>27 28#include "wm8728.h"29 30/*31 * We can't read the WM8728 register space so we cache them instead.32 * Note that the defaults here aren't the physical defaults, we latch33 * the volume update bits, mute the output and enable infinite zero34 * detect.35 */36static const struct reg_default wm8728_reg_defaults[] = {37 { 0, 0x1ff },38 { 1, 0x1ff },39 { 2, 0x001 },40 { 3, 0x100 },41};42 43/* codec private data */44struct wm8728_priv {45 struct regmap *regmap;46};47 48static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);49 50static const struct snd_kcontrol_new wm8728_snd_controls[] = {51 52SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,53 0, 255, 0, wm8728_tlv),54 55SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),56};57 58/*59 * DAPM controls.60 */61static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {62SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),63SND_SOC_DAPM_OUTPUT("VOUTL"),64SND_SOC_DAPM_OUTPUT("VOUTR"),65};66 67static const struct snd_soc_dapm_route wm8728_intercon[] = {68 {"VOUTL", NULL, "DAC"},69 {"VOUTR", NULL, "DAC"},70};71 72static int wm8728_mute(struct snd_soc_dai *dai, int mute, int direction)73{74 struct snd_soc_component *component = dai->component;75 u16 mute_reg = snd_soc_component_read(component, WM8728_DACCTL);76 77 if (mute)78 snd_soc_component_write(component, WM8728_DACCTL, mute_reg | 1);79 else80 snd_soc_component_write(component, WM8728_DACCTL, mute_reg & ~1);81 82 return 0;83}84 85static int wm8728_hw_params(struct snd_pcm_substream *substream,86 struct snd_pcm_hw_params *params,87 struct snd_soc_dai *dai)88{89 struct snd_soc_component *component = dai->component;90 u16 dac = snd_soc_component_read(component, WM8728_DACCTL);91 92 dac &= ~0x18;93 94 switch (params_width(params)) {95 case 16:96 break;97 case 20:98 dac |= 0x10;99 break;100 case 24:101 dac |= 0x08;102 break;103 default:104 return -EINVAL;105 }106 107 snd_soc_component_write(component, WM8728_DACCTL, dac);108 109 return 0;110}111 112static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,113 unsigned int fmt)114{115 struct snd_soc_component *component = codec_dai->component;116 u16 iface = snd_soc_component_read(component, WM8728_IFCTL);117 118 /* Currently only I2S is supported by the driver, though the119 * hardware is more flexible.120 */121 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {122 case SND_SOC_DAIFMT_I2S:123 iface |= 1;124 break;125 default:126 return -EINVAL;127 }128 129 /* The hardware only support full slave mode */130 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {131 case SND_SOC_DAIFMT_CBS_CFS:132 break;133 default:134 return -EINVAL;135 }136 137 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {138 case SND_SOC_DAIFMT_NB_NF:139 iface &= ~0x22;140 break;141 case SND_SOC_DAIFMT_IB_NF:142 iface |= 0x20;143 iface &= ~0x02;144 break;145 case SND_SOC_DAIFMT_NB_IF:146 iface |= 0x02;147 iface &= ~0x20;148 break;149 case SND_SOC_DAIFMT_IB_IF:150 iface |= 0x22;151 break;152 default:153 return -EINVAL;154 }155 156 snd_soc_component_write(component, WM8728_IFCTL, iface);157 return 0;158}159 160static int wm8728_set_bias_level(struct snd_soc_component *component,161 enum snd_soc_bias_level level)162{163 struct wm8728_priv *wm8728 = snd_soc_component_get_drvdata(component);164 u16 reg;165 166 switch (level) {167 case SND_SOC_BIAS_ON:168 case SND_SOC_BIAS_PREPARE:169 case SND_SOC_BIAS_STANDBY:170 if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {171 /* Power everything up... */172 reg = snd_soc_component_read(component, WM8728_DACCTL);173 snd_soc_component_write(component, WM8728_DACCTL, reg & ~0x4);174 175 /* ..then sync in the register cache. */176 regcache_sync(wm8728->regmap);177 }178 break;179 180 case SND_SOC_BIAS_OFF:181 reg = snd_soc_component_read(component, WM8728_DACCTL);182 snd_soc_component_write(component, WM8728_DACCTL, reg | 0x4);183 break;184 }185 return 0;186}187 188#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)189 190#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\191 SNDRV_PCM_FMTBIT_S24_LE)192 193static const struct snd_soc_dai_ops wm8728_dai_ops = {194 .hw_params = wm8728_hw_params,195 .mute_stream = wm8728_mute,196 .set_fmt = wm8728_set_dai_fmt,197 .no_capture_mute = 1,198};199 200static struct snd_soc_dai_driver wm8728_dai = {201 .name = "wm8728-hifi",202 .playback = {203 .stream_name = "Playback",204 .channels_min = 2,205 .channels_max = 2,206 .rates = WM8728_RATES,207 .formats = WM8728_FORMATS,208 },209 .ops = &wm8728_dai_ops,210};211 212static const struct snd_soc_component_driver soc_component_dev_wm8728 = {213 .set_bias_level = wm8728_set_bias_level,214 .controls = wm8728_snd_controls,215 .num_controls = ARRAY_SIZE(wm8728_snd_controls),216 .dapm_widgets = wm8728_dapm_widgets,217 .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),218 .dapm_routes = wm8728_intercon,219 .num_dapm_routes = ARRAY_SIZE(wm8728_intercon),220 .suspend_bias_off = 1,221 .idle_bias_on = 1,222 .use_pmdown_time = 1,223 .endianness = 1,224};225 226static const struct of_device_id wm8728_of_match[] = {227 { .compatible = "wlf,wm8728", },228 { }229};230MODULE_DEVICE_TABLE(of, wm8728_of_match);231 232static const struct regmap_config wm8728_regmap = {233 .reg_bits = 7,234 .val_bits = 9,235 .max_register = WM8728_IFCTL,236 237 .reg_defaults = wm8728_reg_defaults,238 .num_reg_defaults = ARRAY_SIZE(wm8728_reg_defaults),239 .cache_type = REGCACHE_MAPLE,240};241 242#if defined(CONFIG_SPI_MASTER)243static int wm8728_spi_probe(struct spi_device *spi)244{245 struct wm8728_priv *wm8728;246 int ret;247 248 wm8728 = devm_kzalloc(&spi->dev, sizeof(struct wm8728_priv),249 GFP_KERNEL);250 if (wm8728 == NULL)251 return -ENOMEM;252 253 wm8728->regmap = devm_regmap_init_spi(spi, &wm8728_regmap);254 if (IS_ERR(wm8728->regmap))255 return PTR_ERR(wm8728->regmap);256 257 spi_set_drvdata(spi, wm8728);258 259 ret = devm_snd_soc_register_component(&spi->dev,260 &soc_component_dev_wm8728, &wm8728_dai, 1);261 262 return ret;263}264 265static struct spi_driver wm8728_spi_driver = {266 .driver = {267 .name = "wm8728",268 .of_match_table = wm8728_of_match,269 },270 .probe = wm8728_spi_probe,271};272#endif /* CONFIG_SPI_MASTER */273 274#if IS_ENABLED(CONFIG_I2C)275static int wm8728_i2c_probe(struct i2c_client *i2c)276{277 struct wm8728_priv *wm8728;278 int ret;279 280 wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv),281 GFP_KERNEL);282 if (wm8728 == NULL)283 return -ENOMEM;284 285 wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap);286 if (IS_ERR(wm8728->regmap))287 return PTR_ERR(wm8728->regmap);288 289 i2c_set_clientdata(i2c, wm8728);290 291 ret = devm_snd_soc_register_component(&i2c->dev,292 &soc_component_dev_wm8728, &wm8728_dai, 1);293 294 return ret;295}296 297static const struct i2c_device_id wm8728_i2c_id[] = {298 { "wm8728" },299 { }300};301MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);302 303static struct i2c_driver wm8728_i2c_driver = {304 .driver = {305 .name = "wm8728",306 .of_match_table = wm8728_of_match,307 },308 .probe = wm8728_i2c_probe,309 .id_table = wm8728_i2c_id,310};311#endif312 313static int __init wm8728_modinit(void)314{315 int ret = 0;316#if IS_ENABLED(CONFIG_I2C)317 ret = i2c_add_driver(&wm8728_i2c_driver);318 if (ret != 0) {319 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",320 ret);321 }322#endif323#if defined(CONFIG_SPI_MASTER)324 ret = spi_register_driver(&wm8728_spi_driver);325 if (ret != 0) {326 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",327 ret);328 }329#endif330 return ret;331}332module_init(wm8728_modinit);333 334static void __exit wm8728_exit(void)335{336#if IS_ENABLED(CONFIG_I2C)337 i2c_del_driver(&wm8728_i2c_driver);338#endif339#if defined(CONFIG_SPI_MASTER)340 spi_unregister_driver(&wm8728_spi_driver);341#endif342}343module_exit(wm8728_exit);344 345MODULE_DESCRIPTION("ASoC WM8728 driver");346MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");347MODULE_LICENSE("GPL");348