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12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/spi/spi.h>
15#include <linux/of_device.h>
16#include <linux/of_gpio.h>
17#include <linux/regulator/consumer.h>
18#include <sound/asoundef.h>
19#include <sound/core.h>
20#include <sound/soc.h>
21#include <sound/initval.h>
22
23
24#define AK4104_REG_CONTROL1 0x00
25#define AK4104_REG_RESERVED 0x01
26#define AK4104_REG_CONTROL2 0x02
27#define AK4104_REG_TX 0x03
28#define AK4104_REG_CHN_STATUS(x) ((x) + 0x04)
29#define AK4104_NUM_REGS 10
30
31#define AK4104_REG_MASK 0x1f
32#define AK4104_READ 0xc0
33#define AK4104_WRITE 0xe0
34#define AK4104_RESERVED_VAL 0x5b
35
36
37#define AK4104_CONTROL1_RSTN (1 << 0)
38#define AK4104_CONTROL1_PW (1 << 1)
39#define AK4104_CONTROL1_DIF0 (1 << 2)
40#define AK4104_CONTROL1_DIF1 (1 << 3)
41
42#define AK4104_CONTROL2_SEL0 (1 << 0)
43#define AK4104_CONTROL2_SEL1 (1 << 1)
44#define AK4104_CONTROL2_MODE (1 << 2)
45
46#define AK4104_TX_TXE (1 << 0)
47#define AK4104_TX_V (1 << 1)
48
49struct ak4104_private {
50 struct regmap *regmap;
51 struct regulator *regulator;
52};
53
54static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
55SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0),
56
57SND_SOC_DAPM_OUTPUT("TX"),
58};
59
60static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
61 { "TXE", NULL, "Playback" },
62 { "TX", NULL, "TXE" },
63};
64
65static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
66 unsigned int format)
67{
68 struct snd_soc_codec *codec = codec_dai->codec;
69 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
70 int val = 0;
71 int ret;
72
73
74 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
75 case SND_SOC_DAIFMT_RIGHT_J:
76 break;
77 case SND_SOC_DAIFMT_LEFT_J:
78 val |= AK4104_CONTROL1_DIF0;
79 break;
80 case SND_SOC_DAIFMT_I2S:
81 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
82 break;
83 default:
84 dev_err(codec->dev, "invalid dai format\n");
85 return -EINVAL;
86 }
87
88
89 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
90 return -EINVAL;
91
92 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
93 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
94 val);
95 if (ret < 0)
96 return ret;
97
98 return 0;
99}
100
101static int ak4104_hw_params(struct snd_pcm_substream *substream,
102 struct snd_pcm_hw_params *params,
103 struct snd_soc_dai *dai)
104{
105 struct snd_soc_codec *codec = dai->codec;
106 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
107 int ret, val = 0;
108
109
110 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
111 regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);
112
113 val = 0;
114
115 switch (params_rate(params)) {
116 case 22050:
117 val |= IEC958_AES3_CON_FS_22050;
118 break;
119 case 24000:
120 val |= IEC958_AES3_CON_FS_24000;
121 break;
122 case 32000:
123 val |= IEC958_AES3_CON_FS_32000;
124 break;
125 case 44100:
126 val |= IEC958_AES3_CON_FS_44100;
127 break;
128 case 48000:
129 val |= IEC958_AES3_CON_FS_48000;
130 break;
131 case 88200:
132 val |= IEC958_AES3_CON_FS_88200;
133 break;
134 case 96000:
135 val |= IEC958_AES3_CON_FS_96000;
136 break;
137 case 176400:
138 val |= IEC958_AES3_CON_FS_176400;
139 break;
140 case 192000:
141 val |= IEC958_AES3_CON_FS_192000;
142 break;
143 default:
144 dev_err(codec->dev, "unsupported sampling rate\n");
145 return -EINVAL;
146 }
147
148 ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
149 if (ret < 0)
150 return ret;
151
152 return 0;
153}
154
155static const struct snd_soc_dai_ops ak4101_dai_ops = {
156 .hw_params = ak4104_hw_params,
157 .set_fmt = ak4104_set_dai_fmt,
158};
159
160static struct snd_soc_dai_driver ak4104_dai = {
161 .name = "ak4104-hifi",
162 .playback = {
163 .stream_name = "Playback",
164 .channels_min = 2,
165 .channels_max = 2,
166 .rates = SNDRV_PCM_RATE_8000_192000,
167 .formats = SNDRV_PCM_FMTBIT_S16_LE |
168 SNDRV_PCM_FMTBIT_S24_3LE |
169 SNDRV_PCM_FMTBIT_S24_LE
170 },
171 .ops = &ak4101_dai_ops,
172};
173
174static int ak4104_probe(struct snd_soc_codec *codec)
175{
176 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
177 int ret;
178
179 ret = regulator_enable(ak4104->regulator);
180 if (ret < 0) {
181 dev_err(codec->dev, "Unable to enable regulator: %d\n", ret);
182 return ret;
183 }
184
185
186 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
187 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
188 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
189 if (ret < 0)
190 goto exit_disable_regulator;
191
192
193 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
194 AK4104_TX_TXE, AK4104_TX_TXE);
195 if (ret < 0)
196 goto exit_disable_regulator;
197
198 return 0;
199
200exit_disable_regulator:
201 regulator_disable(ak4104->regulator);
202 return ret;
203}
204
205static int ak4104_remove(struct snd_soc_codec *codec)
206{
207 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
208
209 regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
210 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
211 regulator_disable(ak4104->regulator);
212
213 return 0;
214}
215
216#ifdef CONFIG_PM
217static int ak4104_soc_suspend(struct snd_soc_codec *codec)
218{
219 struct ak4104_private *priv = snd_soc_codec_get_drvdata(codec);
220
221 regulator_disable(priv->regulator);
222
223 return 0;
224}
225
226static int ak4104_soc_resume(struct snd_soc_codec *codec)
227{
228 struct ak4104_private *priv = snd_soc_codec_get_drvdata(codec);
229 int ret;
230
231 ret = regulator_enable(priv->regulator);
232 if (ret < 0)
233 return ret;
234
235 return 0;
236}
237#else
238#define ak4104_soc_suspend NULL
239#define ak4104_soc_resume NULL
240#endif
241
242static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
243 .probe = ak4104_probe,
244 .remove = ak4104_remove,
245 .suspend = ak4104_soc_suspend,
246 .resume = ak4104_soc_resume,
247
248 .dapm_widgets = ak4104_dapm_widgets,
249 .num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets),
250 .dapm_routes = ak4104_dapm_routes,
251 .num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes),
252};
253
254static 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
265static int ak4104_spi_probe(struct spi_device *spi)
266{
267 struct device_node *np = spi->dev.of_node;
268 struct ak4104_private *ak4104;
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 if (np) {
297 enum of_gpio_flags flags;
298 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
299
300 if (gpio_is_valid(gpio)) {
301 ret = devm_gpio_request_one(&spi->dev, gpio,
302 flags & OF_GPIO_ACTIVE_LOW ?
303 GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
304 "ak4104 reset");
305 if (ret < 0)
306 return ret;
307 }
308 }
309
310
311
312
313 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
314 if (ret != 0)
315 return ret;
316 if (val != AK4104_RESERVED_VAL)
317 return -ENODEV;
318
319 spi_set_drvdata(spi, ak4104);
320
321 ret = snd_soc_register_codec(&spi->dev,
322 &soc_codec_device_ak4104, &ak4104_dai, 1);
323 return ret;
324}
325
326static int ak4104_spi_remove(struct spi_device *spi)
327{
328 snd_soc_unregister_codec(&spi->dev);
329 return 0;
330}
331
332static const struct of_device_id ak4104_of_match[] = {
333 { .compatible = "asahi-kasei,ak4104", },
334 { }
335};
336MODULE_DEVICE_TABLE(of, ak4104_of_match);
337
338static const struct spi_device_id ak4104_id_table[] = {
339 { "ak4104", 0 },
340 { }
341};
342MODULE_DEVICE_TABLE(spi, ak4104_id_table);
343
344static struct spi_driver ak4104_spi_driver = {
345 .driver = {
346 .name = "ak4104",
347 .of_match_table = ak4104_of_match,
348 },
349 .id_table = ak4104_id_table,
350 .probe = ak4104_spi_probe,
351 .remove = ak4104_spi_remove,
352};
353
354module_spi_driver(ak4104_spi_driver);
355
356MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
357MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
358MODULE_LICENSE("GPL");
359
360
