1
2
3
4
5
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
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
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
45struct ak4104_private {
46 struct regmap *regmap;
47 struct regulator *regulator;
48};
49
50static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
51SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0),
52
53SND_SOC_DAPM_OUTPUT("TX"),
54};
55
56static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
57 { "TXE", NULL, "Playback" },
58 { "TX", NULL, "TXE" },
59};
60
61static 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
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
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
97static 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
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
151static const struct snd_soc_dai_ops ak4101_dai_ops = {
152 .hw_params = ak4104_hw_params,
153 .set_fmt = ak4104_set_dai_fmt,
154};
155
156static 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
173static 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
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
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
199exit_disable_regulator:
200 regulator_disable(ak4104->regulator);
201 return ret;
202}
203
204static 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
214static 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
223static 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
238
239static 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
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 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
303
304
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
318static const struct of_device_id ak4104_of_match[] = {
319 { .compatible = "asahi-kasei,ak4104", },
320 { }
321};
322MODULE_DEVICE_TABLE(of, ak4104_of_match);
323
324static const struct spi_device_id ak4104_id_table[] = {
325 { "ak4104", 0 },
326 { }
327};
328MODULE_DEVICE_TABLE(spi, ak4104_id_table);
329
330static 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
339module_spi_driver(ak4104_spi_driver);
340
341MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
342MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
343MODULE_LICENSE("GPL");
344
345
