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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
48#define DRV_NAME "ak4104-codec"
49
50struct ak4104_private {
51 struct regmap *regmap;
52};
53
54static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
55 unsigned int format)
56{
57 struct snd_soc_codec *codec = codec_dai->codec;
58 int val = 0;
59 int ret;
60
61
62 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
63 case SND_SOC_DAIFMT_RIGHT_J:
64 break;
65 case SND_SOC_DAIFMT_LEFT_J:
66 val |= AK4104_CONTROL1_DIF0;
67 break;
68 case SND_SOC_DAIFMT_I2S:
69 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
70 break;
71 default:
72 dev_err(codec->dev, "invalid dai format\n");
73 return -EINVAL;
74 }
75
76
77 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
78 return -EINVAL;
79
80 ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
81 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
82 val);
83 if (ret < 0)
84 return ret;
85
86 return 0;
87}
88
89static int ak4104_hw_params(struct snd_pcm_substream *substream,
90 struct snd_pcm_hw_params *params,
91 struct snd_soc_dai *dai)
92{
93 struct snd_soc_codec *codec = dai->codec;
94 int val = 0;
95
96
97 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
98 snd_soc_write(codec, AK4104_REG_CHN_STATUS(0), val);
99
100 val = 0;
101
102 switch (params_rate(params)) {
103 case 22050:
104 val |= IEC958_AES3_CON_FS_22050;
105 break;
106 case 24000:
107 val |= IEC958_AES3_CON_FS_24000;
108 break;
109 case 32000:
110 val |= IEC958_AES3_CON_FS_32000;
111 break;
112 case 44100:
113 val |= IEC958_AES3_CON_FS_44100;
114 break;
115 case 48000:
116 val |= IEC958_AES3_CON_FS_48000;
117 break;
118 case 88200:
119 val |= IEC958_AES3_CON_FS_88200;
120 break;
121 case 96000:
122 val |= IEC958_AES3_CON_FS_96000;
123 break;
124 case 176400:
125 val |= IEC958_AES3_CON_FS_176400;
126 break;
127 case 192000:
128 val |= IEC958_AES3_CON_FS_192000;
129 break;
130 default:
131 dev_err(codec->dev, "unsupported sampling rate\n");
132 return -EINVAL;
133 }
134
135 return snd_soc_write(codec, AK4104_REG_CHN_STATUS(3), val);
136}
137
138static const struct snd_soc_dai_ops ak4101_dai_ops = {
139 .hw_params = ak4104_hw_params,
140 .set_fmt = ak4104_set_dai_fmt,
141};
142
143static struct snd_soc_dai_driver ak4104_dai = {
144 .name = "ak4104-hifi",
145 .playback = {
146 .stream_name = "Playback",
147 .channels_min = 2,
148 .channels_max = 2,
149 .rates = SNDRV_PCM_RATE_8000_192000,
150 .formats = SNDRV_PCM_FMTBIT_S16_LE |
151 SNDRV_PCM_FMTBIT_S24_3LE |
152 SNDRV_PCM_FMTBIT_S24_LE
153 },
154 .ops = &ak4101_dai_ops,
155};
156
157static int ak4104_probe(struct snd_soc_codec *codec)
158{
159 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
160 int ret;
161
162 codec->control_data = ak4104->regmap;
163 ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP);
164 if (ret != 0)
165 return ret;
166
167
168 ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
169 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
170 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
171 if (ret < 0)
172 return ret;
173
174
175 ret = snd_soc_update_bits(codec, AK4104_REG_TX,
176 AK4104_TX_TXE, AK4104_TX_TXE);
177 if (ret < 0)
178 return ret;
179
180 return 0;
181}
182
183static int ak4104_remove(struct snd_soc_codec *codec)
184{
185 snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
186 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
187
188 return 0;
189}
190
191static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
192 .probe = ak4104_probe,
193 .remove = ak4104_remove,
194};
195
196static const struct regmap_config ak4104_regmap = {
197 .reg_bits = 8,
198 .val_bits = 8,
199
200 .max_register = AK4104_NUM_REGS - 1,
201 .read_flag_mask = AK4104_READ,
202 .write_flag_mask = AK4104_WRITE,
203
204 .cache_type = REGCACHE_RBTREE,
205};
206
207static int ak4104_spi_probe(struct spi_device *spi)
208{
209 struct device_node *np = spi->dev.of_node;
210 struct ak4104_private *ak4104;
211 unsigned int val;
212 int ret;
213
214 spi->bits_per_word = 8;
215 spi->mode = SPI_MODE_0;
216 ret = spi_setup(spi);
217 if (ret < 0)
218 return ret;
219
220 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
221 GFP_KERNEL);
222 if (ak4104 == NULL)
223 return -ENOMEM;
224
225 ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
226 if (IS_ERR(ak4104->regmap)) {
227 ret = PTR_ERR(ak4104->regmap);
228 return ret;
229 }
230
231 if (np) {
232 enum of_gpio_flags flags;
233 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
234
235 if (gpio_is_valid(gpio)) {
236 ret = devm_gpio_request_one(&spi->dev, gpio,
237 flags & OF_GPIO_ACTIVE_LOW ?
238 GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
239 "ak4104 reset");
240 if (ret < 0)
241 return ret;
242 }
243 }
244
245
246
247
248 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
249 if (ret != 0)
250 return ret;
251 if (val != AK4104_RESERVED_VAL)
252 return -ENODEV;
253
254 spi_set_drvdata(spi, ak4104);
255
256 ret = snd_soc_register_codec(&spi->dev,
257 &soc_codec_device_ak4104, &ak4104_dai, 1);
258 return ret;
259}
260
261static int ak4104_spi_remove(struct spi_device *spi)
262{
263 snd_soc_unregister_codec(&spi->dev);
264 return 0;
265}
266
267static const struct of_device_id ak4104_of_match[] = {
268 { .compatible = "asahi-kasei,ak4104", },
269 { }
270};
271MODULE_DEVICE_TABLE(of, ak4104_of_match);
272
273static struct spi_driver ak4104_spi_driver = {
274 .driver = {
275 .name = DRV_NAME,
276 .owner = THIS_MODULE,
277 .of_match_table = ak4104_of_match,
278 },
279 .probe = ak4104_spi_probe,
280 .remove = ak4104_spi_remove,
281};
282
283module_spi_driver(ak4104_spi_driver);
284
285MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
286MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
287MODULE_LICENSE("GPL");
288
289
