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Linux/sound/soc/codecs/ak4104.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * AK4104 ALSA SoC (ASoC) driver
  4  *
  5  * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
  6  */
  7 
  8 #include <linux/module.h>
  9 #include <linux/slab.h>
 10 #include <linux/spi/spi.h>
 11 #include <linux/of_device.h>
 12 #include <linux/gpio/consumer.h>
 13 #include <linux/regulator/consumer.h>
 14 #include <sound/asoundef.h>
 15 #include <sound/core.h>
 16 #include <sound/soc.h>
 17 #include <sound/initval.h>
 18 
 19 /* AK4104 registers addresses */
 20 #define AK4104_REG_CONTROL1             0x00
 21 #define AK4104_REG_RESERVED             0x01
 22 #define AK4104_REG_CONTROL2             0x02
 23 #define AK4104_REG_TX                   0x03
 24 #define AK4104_REG_CHN_STATUS(x)        ((x) + 0x04)
 25 #define AK4104_NUM_REGS                 10
 26 
 27 #define AK4104_REG_MASK                 0x1f
 28 #define AK4104_READ                     0xc0
 29 #define AK4104_WRITE                    0xe0
 30 #define AK4104_RESERVED_VAL             0x5b
 31 
 32 /* Bit masks for AK4104 registers */
 33 #define AK4104_CONTROL1_RSTN            (1 << 0)
 34 #define AK4104_CONTROL1_PW              (1 << 1)
 35 #define AK4104_CONTROL1_DIF0            (1 << 2)
 36 #define AK4104_CONTROL1_DIF1            (1 << 3)
 37 
 38 #define AK4104_CONTROL2_SEL0            (1 << 0)
 39 #define AK4104_CONTROL2_SEL1            (1 << 1)
 40 #define AK4104_CONTROL2_MODE            (1 << 2)
 41 
 42 #define AK4104_TX_TXE                   (1 << 0)
 43 #define AK4104_TX_V                     (1 << 1)
 44 
 45 struct ak4104_private {
 46         struct regmap *regmap;
 47         struct regulator *regulator;
 48 };
 49 
 50 static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
 51 SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0),
 52 
 53 SND_SOC_DAPM_OUTPUT("TX"),
 54 };
 55 
 56 static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
 57         { "TXE", NULL, "Playback" },
 58         { "TX", NULL, "TXE" },
 59 };
 60 
 61 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
 62                               unsigned int format)
 63 {
 64         struct snd_soc_component *component = codec_dai->component;
 65         struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
 66         int val = 0;
 67         int ret;
 68 
 69         /* set DAI format */
 70         switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
 71         case SND_SOC_DAIFMT_RIGHT_J:
 72                 break;
 73         case SND_SOC_DAIFMT_LEFT_J:
 74                 val |= AK4104_CONTROL1_DIF0;
 75                 break;
 76         case SND_SOC_DAIFMT_I2S:
 77                 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
 78                 break;
 79         default:
 80                 dev_err(component->dev, "invalid dai format\n");
 81                 return -EINVAL;
 82         }
 83 
 84         /* This device can only be slave */
 85         if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
 86                 return -EINVAL;
 87 
 88         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
 89                                  AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
 90                                  val);
 91         if (ret < 0)
 92                 return ret;
 93 
 94         return 0;
 95 }
 96 
 97 static int ak4104_hw_params(struct snd_pcm_substream *substream,
 98                             struct snd_pcm_hw_params *params,
 99                             struct snd_soc_dai *dai)
100 {
101         struct snd_soc_component *component = dai->component;
102         struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
103         int ret, val = 0;
104 
105         /* set the IEC958 bits: consumer mode, no copyright bit */
106         val |= IEC958_AES0_CON_NOT_COPYRIGHT;
107         regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);
108 
109         val = 0;
110 
111         switch (params_rate(params)) {
112         case 22050:
113                 val |= IEC958_AES3_CON_FS_22050;
114                 break;
115         case 24000:
116                 val |= IEC958_AES3_CON_FS_24000;
117                 break;
118         case 32000:
119                 val |= IEC958_AES3_CON_FS_32000;
120                 break;
121         case 44100:
122                 val |= IEC958_AES3_CON_FS_44100;
123                 break;
124         case 48000:
125                 val |= IEC958_AES3_CON_FS_48000;
126                 break;
127         case 88200:
128                 val |= IEC958_AES3_CON_FS_88200;
129                 break;
130         case 96000:
131                 val |= IEC958_AES3_CON_FS_96000;
132                 break;
133         case 176400:
134                 val |= IEC958_AES3_CON_FS_176400;
135                 break;
136         case 192000:
137                 val |= IEC958_AES3_CON_FS_192000;
138                 break;
139         default:
140                 dev_err(component->dev, "unsupported sampling rate\n");
141                 return -EINVAL;
142         }
143 
144         ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
145         if (ret < 0)
146                 return ret;
147 
148         return 0;
149 }
150 
151 static const struct snd_soc_dai_ops ak4101_dai_ops = {
152         .hw_params = ak4104_hw_params,
153         .set_fmt = ak4104_set_dai_fmt,
154 };
155 
156 static struct snd_soc_dai_driver ak4104_dai = {
157         .name = "ak4104-hifi",
158         .playback = {
159                 .stream_name = "Playback",
160                 .channels_min = 2,
161                 .channels_max = 2,
162                 .rates = SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
163                          SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
164                          SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
165                          SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000,
166                 .formats = SNDRV_PCM_FMTBIT_S16_LE  |
167                            SNDRV_PCM_FMTBIT_S24_3LE |
168                            SNDRV_PCM_FMTBIT_S24_LE
169         },
170         .ops = &ak4101_dai_ops,
171 };
172 
173 static int ak4104_probe(struct snd_soc_component *component)
174 {
175         struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
176         int ret;
177 
178         ret = regulator_enable(ak4104->regulator);
179         if (ret < 0) {
180                 dev_err(component->dev, "Unable to enable regulator: %d\n", ret);
181                 return ret;
182         }
183 
184         /* set power-up and non-reset bits */
185         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
186                                  AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
187                                  AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
188         if (ret < 0)
189                 goto exit_disable_regulator;
190 
191         /* enable transmitter */
192         ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
193                                  AK4104_TX_TXE, AK4104_TX_TXE);
194         if (ret < 0)
195                 goto exit_disable_regulator;
196 
197         return 0;
198 
199 exit_disable_regulator:
200         regulator_disable(ak4104->regulator);
201         return ret;
202 }
203 
204 static void ak4104_remove(struct snd_soc_component *component)
205 {
206         struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
207 
208         regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
209                            AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
210         regulator_disable(ak4104->regulator);
211 }
212 
213 #ifdef CONFIG_PM
214 static int ak4104_soc_suspend(struct snd_soc_component *component)
215 {
216         struct ak4104_private *priv = snd_soc_component_get_drvdata(component);
217 
218         regulator_disable(priv->regulator);
219 
220         return 0;
221 }
222 
223 static int ak4104_soc_resume(struct snd_soc_component *component)
224 {
225         struct ak4104_private *priv = snd_soc_component_get_drvdata(component);
226         int ret;
227 
228         ret = regulator_enable(priv->regulator);
229         if (ret < 0)
230                 return ret;
231 
232         return 0;
233 }
234 #else
235 #define ak4104_soc_suspend      NULL
236 #define ak4104_soc_resume       NULL
237 #endif /* CONFIG_PM */
238 
239 static const struct snd_soc_component_driver soc_component_device_ak4104 = {
240         .probe                  = ak4104_probe,
241         .remove                 = ak4104_remove,
242         .suspend                = ak4104_soc_suspend,
243         .resume                 = ak4104_soc_resume,
244         .dapm_widgets           = ak4104_dapm_widgets,
245         .num_dapm_widgets       = ARRAY_SIZE(ak4104_dapm_widgets),
246         .dapm_routes            = ak4104_dapm_routes,
247         .num_dapm_routes        = ARRAY_SIZE(ak4104_dapm_routes),
248         .idle_bias_on           = 1,
249         .use_pmdown_time        = 1,
250         .endianness             = 1,
251         .non_legacy_dai_naming  = 1,
252 };
253 
254 static const struct regmap_config ak4104_regmap = {
255         .reg_bits = 8,
256         .val_bits = 8,
257 
258         .max_register = AK4104_NUM_REGS - 1,
259         .read_flag_mask = AK4104_READ,
260         .write_flag_mask = AK4104_WRITE,
261 
262         .cache_type = REGCACHE_RBTREE,
263 };
264 
265 static int ak4104_spi_probe(struct spi_device *spi)
266 {
267         struct ak4104_private *ak4104;
268         struct gpio_desc *reset_gpiod;
269         unsigned int val;
270         int ret;
271 
272         spi->bits_per_word = 8;
273         spi->mode = SPI_MODE_0;
274         ret = spi_setup(spi);
275         if (ret < 0)
276                 return ret;
277 
278         ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
279                               GFP_KERNEL);
280         if (ak4104 == NULL)
281                 return -ENOMEM;
282 
283         ak4104->regulator = devm_regulator_get(&spi->dev, "vdd");
284         if (IS_ERR(ak4104->regulator)) {
285                 ret = PTR_ERR(ak4104->regulator);
286                 dev_err(&spi->dev, "Unable to get Vdd regulator: %d\n", ret);
287                 return ret;
288         }
289 
290         ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
291         if (IS_ERR(ak4104->regmap)) {
292                 ret = PTR_ERR(ak4104->regmap);
293                 return ret;
294         }
295 
296         reset_gpiod = devm_gpiod_get_optional(&spi->dev, "reset",
297                                               GPIOD_OUT_HIGH);
298         if (IS_ERR(reset_gpiod) &&
299             PTR_ERR(reset_gpiod) == -EPROBE_DEFER)
300                 return -EPROBE_DEFER;
301 
302         /* read the 'reserved' register - according to the datasheet, it
303          * should contain 0x5b. Not a good way to verify the presence of
304          * the device, but there is no hardware ID register. */
305         ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
306         if (ret != 0)
307                 return ret;
308         if (val != AK4104_RESERVED_VAL)
309                 return -ENODEV;
310 
311         spi_set_drvdata(spi, ak4104);
312 
313         ret = devm_snd_soc_register_component(&spi->dev,
314                         &soc_component_device_ak4104, &ak4104_dai, 1);
315         return ret;
316 }
317 
318 static const struct of_device_id ak4104_of_match[] = {
319         { .compatible = "asahi-kasei,ak4104", },
320         { }
321 };
322 MODULE_DEVICE_TABLE(of, ak4104_of_match);
323 
324 static const struct spi_device_id ak4104_id_table[] = {
325         { "ak4104", 0 },
326         { }
327 };
328 MODULE_DEVICE_TABLE(spi, ak4104_id_table);
329 
330 static struct spi_driver ak4104_spi_driver = {
331         .driver  = {
332                 .name   = "ak4104",
333                 .of_match_table = ak4104_of_match,
334         },
335         .id_table = ak4104_id_table,
336         .probe  = ak4104_spi_probe,
337 };
338 
339 module_spi_driver(ak4104_spi_driver);
340 
341 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
342 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
343 MODULE_LICENSE("GPL");
344 
345 

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