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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/gpio/consumer.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_component *component = codec_dai->component;
69 struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
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(component->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_component *component = dai->component;
106 struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
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(component->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_22050 | SNDRV_PCM_RATE_32000 |
167 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
168 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
169 SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000,
170 .formats = SNDRV_PCM_FMTBIT_S16_LE |
171 SNDRV_PCM_FMTBIT_S24_3LE |
172 SNDRV_PCM_FMTBIT_S24_LE
173 },
174 .ops = &ak4101_dai_ops,
175};
176
177static int ak4104_probe(struct snd_soc_component *component)
178{
179 struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
180 int ret;
181
182 ret = regulator_enable(ak4104->regulator);
183 if (ret < 0) {
184 dev_err(component->dev, "Unable to enable regulator: %d\n", ret);
185 return ret;
186 }
187
188
189 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
190 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
191 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
192 if (ret < 0)
193 goto exit_disable_regulator;
194
195
196 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
197 AK4104_TX_TXE, AK4104_TX_TXE);
198 if (ret < 0)
199 goto exit_disable_regulator;
200
201 return 0;
202
203exit_disable_regulator:
204 regulator_disable(ak4104->regulator);
205 return ret;
206}
207
208static void ak4104_remove(struct snd_soc_component *component)
209{
210 struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component);
211
212 regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
213 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
214 regulator_disable(ak4104->regulator);
215}
216
217#ifdef CONFIG_PM
218static int ak4104_soc_suspend(struct snd_soc_component *component)
219{
220 struct ak4104_private *priv = snd_soc_component_get_drvdata(component);
221
222 regulator_disable(priv->regulator);
223
224 return 0;
225}
226
227static int ak4104_soc_resume(struct snd_soc_component *component)
228{
229 struct ak4104_private *priv = snd_soc_component_get_drvdata(component);
230 int ret;
231
232 ret = regulator_enable(priv->regulator);
233 if (ret < 0)
234 return ret;
235
236 return 0;
237}
238#else
239#define ak4104_soc_suspend NULL
240#define ak4104_soc_resume NULL
241#endif
242
243static const struct snd_soc_component_driver soc_component_device_ak4104 = {
244 .probe = ak4104_probe,
245 .remove = ak4104_remove,
246 .suspend = ak4104_soc_suspend,
247 .resume = ak4104_soc_resume,
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 .idle_bias_on = 1,
253 .use_pmdown_time = 1,
254 .endianness = 1,
255 .non_legacy_dai_naming = 1,
256};
257
258static const struct regmap_config ak4104_regmap = {
259 .reg_bits = 8,
260 .val_bits = 8,
261
262 .max_register = AK4104_NUM_REGS - 1,
263 .read_flag_mask = AK4104_READ,
264 .write_flag_mask = AK4104_WRITE,
265
266 .cache_type = REGCACHE_RBTREE,
267};
268
269static int ak4104_spi_probe(struct spi_device *spi)
270{
271 struct ak4104_private *ak4104;
272 struct gpio_desc *reset_gpiod;
273 unsigned int val;
274 int ret;
275
276 spi->bits_per_word = 8;
277 spi->mode = SPI_MODE_0;
278 ret = spi_setup(spi);
279 if (ret < 0)
280 return ret;
281
282 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
283 GFP_KERNEL);
284 if (ak4104 == NULL)
285 return -ENOMEM;
286
287 ak4104->regulator = devm_regulator_get(&spi->dev, "vdd");
288 if (IS_ERR(ak4104->regulator)) {
289 ret = PTR_ERR(ak4104->regulator);
290 dev_err(&spi->dev, "Unable to get Vdd regulator: %d\n", ret);
291 return ret;
292 }
293
294 ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
295 if (IS_ERR(ak4104->regmap)) {
296 ret = PTR_ERR(ak4104->regmap);
297 return ret;
298 }
299
300 reset_gpiod = devm_gpiod_get_optional(&spi->dev, "reset",
301 GPIOD_OUT_HIGH);
302 if (IS_ERR(reset_gpiod) &&
303 PTR_ERR(reset_gpiod) == -EPROBE_DEFER)
304 return -EPROBE_DEFER;
305
306
307
308
309 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
310 if (ret != 0)
311 return ret;
312 if (val != AK4104_RESERVED_VAL)
313 return -ENODEV;
314
315 spi_set_drvdata(spi, ak4104);
316
317 ret = devm_snd_soc_register_component(&spi->dev,
318 &soc_component_device_ak4104, &ak4104_dai, 1);
319 return ret;
320}
321
322static const struct of_device_id ak4104_of_match[] = {
323 { .compatible = "asahi-kasei,ak4104", },
324 { }
325};
326MODULE_DEVICE_TABLE(of, ak4104_of_match);
327
328static const struct spi_device_id ak4104_id_table[] = {
329 { "ak4104", 0 },
330 { }
331};
332MODULE_DEVICE_TABLE(spi, ak4104_id_table);
333
334static struct spi_driver ak4104_spi_driver = {
335 .driver = {
336 .name = "ak4104",
337 .of_match_table = ak4104_of_match,
338 },
339 .id_table = ak4104_id_table,
340 .probe = ak4104_spi_probe,
341};
342
343module_spi_driver(ak4104_spi_driver);
344
345MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
346MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
347MODULE_LICENSE("GPL");
348
349
