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12#include <linux/module.h>
13#include <linux/slab.h>
14#include <sound/core.h>
15#include <sound/soc.h>
16#include <sound/initval.h>
17#include <linux/spi/spi.h>
18#include <linux/of_device.h>
19#include <linux/of_gpio.h>
20#include <sound/asoundef.h>
21
22
23#define AK4104_REG_CONTROL1 0x00
24#define AK4104_REG_RESERVED 0x01
25#define AK4104_REG_CONTROL2 0x02
26#define AK4104_REG_TX 0x03
27#define AK4104_REG_CHN_STATUS(x) ((x) + 0x04)
28#define AK4104_NUM_REGS 10
29
30#define AK4104_REG_MASK 0x1f
31#define AK4104_READ 0xc0
32#define AK4104_WRITE 0xe0
33#define AK4104_RESERVED_VAL 0x5b
34
35
36#define AK4104_CONTROL1_RSTN (1 << 0)
37#define AK4104_CONTROL1_PW (1 << 1)
38#define AK4104_CONTROL1_DIF0 (1 << 2)
39#define AK4104_CONTROL1_DIF1 (1 << 3)
40
41#define AK4104_CONTROL2_SEL0 (1 << 0)
42#define AK4104_CONTROL2_SEL1 (1 << 1)
43#define AK4104_CONTROL2_MODE (1 << 2)
44
45#define AK4104_TX_TXE (1 << 0)
46#define AK4104_TX_V (1 << 1)
47
48struct ak4104_private {
49 struct regmap *regmap;
50};
51
52static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
53SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0),
54
55SND_SOC_DAPM_OUTPUT("TX"),
56};
57
58static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
59 { "TXE", NULL, "Playback" },
60 { "TX", NULL, "TXE" },
61};
62
63static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
64 unsigned int format)
65{
66 struct snd_soc_codec *codec = codec_dai->codec;
67 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
68 int val = 0;
69 int ret;
70
71
72 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
73 case SND_SOC_DAIFMT_RIGHT_J:
74 break;
75 case SND_SOC_DAIFMT_LEFT_J:
76 val |= AK4104_CONTROL1_DIF0;
77 break;
78 case SND_SOC_DAIFMT_I2S:
79 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
80 break;
81 default:
82 dev_err(codec->dev, "invalid dai format\n");
83 return -EINVAL;
84 }
85
86
87 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
88 return -EINVAL;
89
90 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
91 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
92 val);
93 if (ret < 0)
94 return ret;
95
96 return 0;
97}
98
99static int ak4104_hw_params(struct snd_pcm_substream *substream,
100 struct snd_pcm_hw_params *params,
101 struct snd_soc_dai *dai)
102{
103 struct snd_soc_codec *codec = dai->codec;
104 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
105 int ret, val = 0;
106
107
108 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
109 regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);
110
111 val = 0;
112
113 switch (params_rate(params)) {
114 case 22050:
115 val |= IEC958_AES3_CON_FS_22050;
116 break;
117 case 24000:
118 val |= IEC958_AES3_CON_FS_24000;
119 break;
120 case 32000:
121 val |= IEC958_AES3_CON_FS_32000;
122 break;
123 case 44100:
124 val |= IEC958_AES3_CON_FS_44100;
125 break;
126 case 48000:
127 val |= IEC958_AES3_CON_FS_48000;
128 break;
129 case 88200:
130 val |= IEC958_AES3_CON_FS_88200;
131 break;
132 case 96000:
133 val |= IEC958_AES3_CON_FS_96000;
134 break;
135 case 176400:
136 val |= IEC958_AES3_CON_FS_176400;
137 break;
138 case 192000:
139 val |= IEC958_AES3_CON_FS_192000;
140 break;
141 default:
142 dev_err(codec->dev, "unsupported sampling rate\n");
143 return -EINVAL;
144 }
145
146 ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
147 if (ret < 0)
148 return ret;
149
150 return 0;
151}
152
153static const struct snd_soc_dai_ops ak4101_dai_ops = {
154 .hw_params = ak4104_hw_params,
155 .set_fmt = ak4104_set_dai_fmt,
156};
157
158static struct snd_soc_dai_driver ak4104_dai = {
159 .name = "ak4104-hifi",
160 .playback = {
161 .stream_name = "Playback",
162 .channels_min = 2,
163 .channels_max = 2,
164 .rates = SNDRV_PCM_RATE_8000_192000,
165 .formats = SNDRV_PCM_FMTBIT_S16_LE |
166 SNDRV_PCM_FMTBIT_S24_3LE |
167 SNDRV_PCM_FMTBIT_S24_LE
168 },
169 .ops = &ak4101_dai_ops,
170};
171
172static int ak4104_probe(struct snd_soc_codec *codec)
173{
174 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
175 int ret;
176
177 codec->control_data = ak4104->regmap;
178
179
180 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
181 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
182 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
183 if (ret < 0)
184 return ret;
185
186
187 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
188 AK4104_TX_TXE, AK4104_TX_TXE);
189 if (ret < 0)
190 return ret;
191
192 return 0;
193}
194
195static int ak4104_remove(struct snd_soc_codec *codec)
196{
197 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
198
199 regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
200 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
201
202 return 0;
203}
204
205static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
206 .probe = ak4104_probe,
207 .remove = ak4104_remove,
208
209 .dapm_widgets = ak4104_dapm_widgets,
210 .num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets),
211 .dapm_routes = ak4104_dapm_routes,
212 .num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes),
213};
214
215static const struct regmap_config ak4104_regmap = {
216 .reg_bits = 8,
217 .val_bits = 8,
218
219 .max_register = AK4104_NUM_REGS - 1,
220 .read_flag_mask = AK4104_READ,
221 .write_flag_mask = AK4104_WRITE,
222
223 .cache_type = REGCACHE_RBTREE,
224};
225
226static int ak4104_spi_probe(struct spi_device *spi)
227{
228 struct device_node *np = spi->dev.of_node;
229 struct ak4104_private *ak4104;
230 unsigned int val;
231 int ret;
232
233 spi->bits_per_word = 8;
234 spi->mode = SPI_MODE_0;
235 ret = spi_setup(spi);
236 if (ret < 0)
237 return ret;
238
239 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
240 GFP_KERNEL);
241 if (ak4104 == NULL)
242 return -ENOMEM;
243
244 ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
245 if (IS_ERR(ak4104->regmap)) {
246 ret = PTR_ERR(ak4104->regmap);
247 return ret;
248 }
249
250 if (np) {
251 enum of_gpio_flags flags;
252 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
253
254 if (gpio_is_valid(gpio)) {
255 ret = devm_gpio_request_one(&spi->dev, gpio,
256 flags & OF_GPIO_ACTIVE_LOW ?
257 GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
258 "ak4104 reset");
259 if (ret < 0)
260 return ret;
261 }
262 }
263
264
265
266
267 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
268 if (ret != 0)
269 return ret;
270 if (val != AK4104_RESERVED_VAL)
271 return -ENODEV;
272
273 spi_set_drvdata(spi, ak4104);
274
275 ret = snd_soc_register_codec(&spi->dev,
276 &soc_codec_device_ak4104, &ak4104_dai, 1);
277 return ret;
278}
279
280static int ak4104_spi_remove(struct spi_device *spi)
281{
282 snd_soc_unregister_codec(&spi->dev);
283 return 0;
284}
285
286static const struct of_device_id ak4104_of_match[] = {
287 { .compatible = "asahi-kasei,ak4104", },
288 { }
289};
290MODULE_DEVICE_TABLE(of, ak4104_of_match);
291
292static const struct spi_device_id ak4104_id_table[] = {
293 { "ak4104", 0 },
294 { }
295};
296MODULE_DEVICE_TABLE(spi, ak4104_id_table);
297
298static struct spi_driver ak4104_spi_driver = {
299 .driver = {
300 .name = "ak4104",
301 .owner = THIS_MODULE,
302 .of_match_table = ak4104_of_match,
303 },
304 .id_table = ak4104_id_table,
305 .probe = ak4104_spi_probe,
306 .remove = ak4104_spi_remove,
307};
308
309module_spi_driver(ak4104_spi_driver);
310
311MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
312MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
313MODULE_LICENSE("GPL");
314
315
