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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 <sound/asoundef.h>
19
20#include "ak4104.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"
49
50struct ak4104_private {
51 struct snd_soc_codec codec;
52 u8 reg_cache[AK4104_NUM_REGS];
53};
54
55static int ak4104_fill_cache(struct snd_soc_codec *codec)
56{
57 int i;
58 u8 *reg_cache = codec->reg_cache;
59 struct spi_device *spi = codec->control_data;
60
61 for (i = 0; i < codec->reg_cache_size; i++) {
62 int ret = spi_w8r8(spi, i | AK4104_READ);
63 if (ret < 0) {
64 dev_err(&spi->dev, "SPI write failure\n");
65 return ret;
66 }
67
68 reg_cache[i] = ret;
69 }
70
71 return 0;
72}
73
74static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec,
75 unsigned int reg)
76{
77 u8 *reg_cache = codec->reg_cache;
78
79 if (reg >= codec->reg_cache_size)
80 return -EINVAL;
81
82 return reg_cache[reg];
83}
84
85static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg,
86 unsigned int value)
87{
88 u8 *cache = codec->reg_cache;
89 struct spi_device *spi = codec->control_data;
90
91 if (reg >= codec->reg_cache_size)
92 return -EINVAL;
93
94
95 if (cache[reg] != value) {
96 u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, value };
97
98 if (spi_write(spi, tmp, sizeof(tmp))) {
99 dev_err(&spi->dev, "SPI write failed\n");
100 return -EIO;
101 }
102
103 cache[reg] = value;
104 }
105
106 return 0;
107}
108
109static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
110 unsigned int format)
111{
112 struct snd_soc_codec *codec = codec_dai->codec;
113 int val = 0;
114
115 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
116 if (val < 0)
117 return val;
118
119 val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1);
120
121
122 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
123 case SND_SOC_DAIFMT_RIGHT_J:
124 break;
125 case SND_SOC_DAIFMT_LEFT_J:
126 val |= AK4104_CONTROL1_DIF0;
127 break;
128 case SND_SOC_DAIFMT_I2S:
129 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
130 break;
131 default:
132 dev_err(codec->dev, "invalid dai format\n");
133 return -EINVAL;
134 }
135
136
137 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
138 return -EINVAL;
139
140 return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
141}
142
143static int ak4104_hw_params(struct snd_pcm_substream *substream,
144 struct snd_pcm_hw_params *params,
145 struct snd_soc_dai *dai)
146{
147 struct snd_soc_pcm_runtime *rtd = substream->private_data;
148 struct snd_soc_device *socdev = rtd->socdev;
149 struct snd_soc_codec *codec = socdev->card->codec;
150 int val = 0;
151
152
153 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
154 ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val);
155
156 val = 0;
157
158 switch (params_rate(params)) {
159 case 44100:
160 val |= IEC958_AES3_CON_FS_44100;
161 break;
162 case 48000:
163 val |= IEC958_AES3_CON_FS_48000;
164 break;
165 case 32000:
166 val |= IEC958_AES3_CON_FS_32000;
167 break;
168 default:
169 dev_err(codec->dev, "unsupported sampling rate\n");
170 return -EINVAL;
171 }
172
173 return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val);
174}
175
176static struct snd_soc_dai_ops ak4101_dai_ops = {
177 .hw_params = ak4104_hw_params,
178 .set_fmt = ak4104_set_dai_fmt,
179};
180
181struct snd_soc_dai ak4104_dai = {
182 .name = DRV_NAME,
183 .playback = {
184 .stream_name = "Playback",
185 .channels_min = 2,
186 .channels_max = 2,
187 .rates = SNDRV_PCM_RATE_8000_192000,
188 .formats = SNDRV_PCM_FMTBIT_S16_LE |
189 SNDRV_PCM_FMTBIT_S24_3LE |
190 SNDRV_PCM_FMTBIT_S24_LE
191 },
192 .ops = &ak4101_dai_ops,
193};
194
195static struct snd_soc_codec *ak4104_codec;
196
197static int ak4104_spi_probe(struct spi_device *spi)
198{
199 struct snd_soc_codec *codec;
200 struct ak4104_private *ak4104;
201 int ret, val;
202
203 spi->bits_per_word = 8;
204 spi->mode = SPI_MODE_0;
205 ret = spi_setup(spi);
206 if (ret < 0)
207 return ret;
208
209 ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL);
210 if (!ak4104) {
211 dev_err(&spi->dev, "could not allocate codec\n");
212 return -ENOMEM;
213 }
214
215 codec = &ak4104->codec;
216 mutex_init(&codec->mutex);
217 INIT_LIST_HEAD(&codec->dapm_widgets);
218 INIT_LIST_HEAD(&codec->dapm_paths);
219
220 codec->dev = &spi->dev;
221 codec->name = DRV_NAME;
222 codec->owner = THIS_MODULE;
223 codec->dai = &ak4104_dai;
224 codec->num_dai = 1;
225 snd_soc_codec_set_drvdata(codec, ak4104);
226 codec->control_data = spi;
227 codec->reg_cache = ak4104->reg_cache;
228 codec->reg_cache_size = AK4104_NUM_REGS;
229
230
231 ret = ak4104_fill_cache(codec);
232 if (ret < 0) {
233 dev_err(&spi->dev, "failed to fill register cache\n");
234 return ret;
235 }
236
237
238
239
240 if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) !=
241 AK4104_RESERVED_VAL) {
242 ret = -ENODEV;
243 goto error_free_codec;
244 }
245
246
247 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
248 val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN;
249 ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
250 if (ret < 0)
251 goto error_free_codec;
252
253
254 val = ak4104_read_reg_cache(codec, AK4104_REG_TX);
255 val |= AK4104_TX_TXE;
256 ret = ak4104_spi_write(codec, AK4104_REG_TX, val);
257 if (ret < 0)
258 goto error_free_codec;
259
260 ak4104_codec = codec;
261 ret = snd_soc_register_dai(&ak4104_dai);
262 if (ret < 0) {
263 dev_err(&spi->dev, "failed to register DAI\n");
264 goto error_free_codec;
265 }
266
267 spi_set_drvdata(spi, ak4104);
268 dev_info(&spi->dev, "SPI device initialized\n");
269 return 0;
270
271error_free_codec:
272 kfree(ak4104);
273 ak4104_dai.dev = NULL;
274 return ret;
275}
276
277static int __devexit ak4104_spi_remove(struct spi_device *spi)
278{
279 int ret, val;
280 struct ak4104_private *ak4104 = spi_get_drvdata(spi);
281
282 val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1);
283 if (val < 0)
284 return val;
285
286
287 val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
288 ret = ak4104_spi_write(&ak4104->codec, AK4104_REG_CONTROL1, val);
289 if (ret < 0)
290 return ret;
291
292 ak4104_codec = NULL;
293 kfree(ak4104);
294 return 0;
295}
296
297static int ak4104_probe(struct platform_device *pdev)
298{
299 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
300 struct snd_soc_codec *codec = ak4104_codec;
301 int ret;
302
303
304 socdev->card->codec = codec;
305
306
307 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
308 if (ret < 0) {
309 dev_err(codec->dev, "failed to create pcms\n");
310 return ret;
311 }
312
313 return 0;
314}
315
316static int ak4104_remove(struct platform_device *pdev)
317{
318 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
319 snd_soc_free_pcms(socdev);
320 return 0;
321};
322
323struct snd_soc_codec_device soc_codec_device_ak4104 = {
324 .probe = ak4104_probe,
325 .remove = ak4104_remove
326};
327EXPORT_SYMBOL_GPL(soc_codec_device_ak4104);
328
329static struct spi_driver ak4104_spi_driver = {
330 .driver = {
331 .name = DRV_NAME,
332 .owner = THIS_MODULE,
333 },
334 .probe = ak4104_spi_probe,
335 .remove = __devexit_p(ak4104_spi_remove),
336};
337
338static int __init ak4104_init(void)
339{
340 pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n");
341 return spi_register_driver(&ak4104_spi_driver);
342}
343module_init(ak4104_init);
344
345static void __exit ak4104_exit(void)
346{
347 spi_unregister_driver(&ak4104_spi_driver);
348}
349module_exit(ak4104_exit);
350
351MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
352MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
353MODULE_LICENSE("GPL");
354
355
