1
2
3
4
5
6
7
8
9
10
11
12#include <linux/module.h>
13#include <sound/core.h>
14#include <sound/soc.h>
15#include <sound/initval.h>
16#include <linux/spi/spi.h>
17#include <sound/asoundef.h>
18
19#include "ak4104.h"
20
21
22#define AK4104_REG_CONTROL1 0x00
23#define AK4104_REG_RESERVED 0x01
24#define AK4104_REG_CONTROL2 0x02
25#define AK4104_REG_TX 0x03
26#define AK4104_REG_CHN_STATUS(x) ((x) + 0x04)
27#define AK4104_NUM_REGS 10
28
29#define AK4104_REG_MASK 0x1f
30#define AK4104_READ 0xc0
31#define AK4104_WRITE 0xe0
32#define AK4104_RESERVED_VAL 0x5b
33
34
35#define AK4104_CONTROL1_RSTN (1 << 0)
36#define AK4104_CONTROL1_PW (1 << 1)
37#define AK4104_CONTROL1_DIF0 (1 << 2)
38#define AK4104_CONTROL1_DIF1 (1 << 3)
39
40#define AK4104_CONTROL2_SEL0 (1 << 0)
41#define AK4104_CONTROL2_SEL1 (1 << 1)
42#define AK4104_CONTROL2_MODE (1 << 2)
43
44#define AK4104_TX_TXE (1 << 0)
45#define AK4104_TX_V (1 << 1)
46
47#define DRV_NAME "ak4104"
48
49struct ak4104_private {
50 struct snd_soc_codec codec;
51 u8 reg_cache[AK4104_NUM_REGS];
52};
53
54static int ak4104_fill_cache(struct snd_soc_codec *codec)
55{
56 int i;
57 u8 *reg_cache = codec->reg_cache;
58 struct spi_device *spi = codec->control_data;
59
60 for (i = 0; i < codec->reg_cache_size; i++) {
61 int ret = spi_w8r8(spi, i | AK4104_READ);
62 if (ret < 0) {
63 dev_err(&spi->dev, "SPI write failure\n");
64 return ret;
65 }
66
67 reg_cache[i] = ret;
68 }
69
70 return 0;
71}
72
73static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec,
74 unsigned int reg)
75{
76 u8 *reg_cache = codec->reg_cache;
77
78 if (reg >= codec->reg_cache_size)
79 return -EINVAL;
80
81 return reg_cache[reg];
82}
83
84static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg,
85 unsigned int value)
86{
87 u8 *cache = codec->reg_cache;
88 struct spi_device *spi = codec->control_data;
89
90 if (reg >= codec->reg_cache_size)
91 return -EINVAL;
92
93 reg &= AK4104_REG_MASK;
94 reg |= AK4104_WRITE;
95
96
97 if (cache[reg] != value) {
98 u8 tmp[2] = { reg, value };
99 if (spi_write(spi, tmp, sizeof(tmp))) {
100 dev_err(&spi->dev, "SPI write failed\n");
101 return -EIO;
102 }
103
104 cache[reg] = value;
105 }
106
107 return 0;
108}
109
110static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
111 unsigned int format)
112{
113 struct snd_soc_codec *codec = codec_dai->codec;
114 int val = 0;
115
116 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
117 if (val < 0)
118 return val;
119
120 val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1);
121
122
123 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
124 case SND_SOC_DAIFMT_RIGHT_J:
125 break;
126 case SND_SOC_DAIFMT_LEFT_J:
127 val |= AK4104_CONTROL1_DIF0;
128 break;
129 case SND_SOC_DAIFMT_I2S:
130 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
131 break;
132 default:
133 dev_err(codec->dev, "invalid dai format\n");
134 return -EINVAL;
135 }
136
137
138 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
139 return -EINVAL;
140
141 return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
142}
143
144static int ak4104_hw_params(struct snd_pcm_substream *substream,
145 struct snd_pcm_hw_params *params,
146 struct snd_soc_dai *dai)
147{
148 struct snd_soc_pcm_runtime *rtd = substream->private_data;
149 struct snd_soc_device *socdev = rtd->socdev;
150 struct snd_soc_codec *codec = socdev->card->codec;
151 int val = 0;
152
153
154 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
155 ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val);
156
157 val = 0;
158
159 switch (params_rate(params)) {
160 case 44100:
161 val |= IEC958_AES3_CON_FS_44100;
162 break;
163 case 48000:
164 val |= IEC958_AES3_CON_FS_48000;
165 break;
166 case 32000:
167 val |= IEC958_AES3_CON_FS_32000;
168 break;
169 default:
170 dev_err(codec->dev, "unsupported sampling rate\n");
171 return -EINVAL;
172 }
173
174 return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val);
175}
176
177static struct snd_soc_dai_ops ak4101_dai_ops = {
178 .hw_params = ak4104_hw_params,
179 .set_fmt = ak4104_set_dai_fmt,
180};
181
182struct snd_soc_dai ak4104_dai = {
183 .name = DRV_NAME,
184 .playback = {
185 .stream_name = "Playback",
186 .channels_min = 2,
187 .channels_max = 2,
188 .rates = SNDRV_PCM_RATE_44100 |
189 SNDRV_PCM_RATE_48000 |
190 SNDRV_PCM_RATE_32000,
191 .formats = SNDRV_PCM_FMTBIT_S16_LE |
192 SNDRV_PCM_FMTBIT_S24_3LE |
193 SNDRV_PCM_FMTBIT_S24_LE
194 },
195 .ops = &ak4101_dai_ops,
196};
197
198static struct snd_soc_codec *ak4104_codec;
199
200static int ak4104_spi_probe(struct spi_device *spi)
201{
202 struct snd_soc_codec *codec;
203 struct ak4104_private *ak4104;
204 int ret, val;
205
206 spi->bits_per_word = 8;
207 spi->mode = SPI_MODE_0;
208 ret = spi_setup(spi);
209 if (ret < 0)
210 return ret;
211
212 ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL);
213 if (!ak4104) {
214 dev_err(&spi->dev, "could not allocate codec\n");
215 return -ENOMEM;
216 }
217
218 codec = &ak4104->codec;
219 mutex_init(&codec->mutex);
220 INIT_LIST_HEAD(&codec->dapm_widgets);
221 INIT_LIST_HEAD(&codec->dapm_paths);
222
223 codec->dev = &spi->dev;
224 codec->name = DRV_NAME;
225 codec->owner = THIS_MODULE;
226 codec->dai = &ak4104_dai;
227 codec->num_dai = 1;
228 codec->private_data = ak4104;
229 codec->control_data = spi;
230 codec->reg_cache = ak4104->reg_cache;
231 codec->reg_cache_size = AK4104_NUM_REGS;
232
233
234 ret = ak4104_fill_cache(codec);
235 if (ret < 0) {
236 dev_err(&spi->dev, "failed to fill register cache\n");
237 return ret;
238 }
239
240
241
242
243 if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) !=
244 AK4104_RESERVED_VAL) {
245 ret = -ENODEV;
246 goto error_free_codec;
247 }
248
249
250 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
251 val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN;
252 ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
253 if (ret < 0)
254 goto error_free_codec;
255
256
257 val = ak4104_read_reg_cache(codec, AK4104_REG_TX);
258 val |= AK4104_TX_TXE;
259 ret = ak4104_spi_write(codec, AK4104_REG_TX, val);
260 if (ret < 0)
261 goto error_free_codec;
262
263 ak4104_codec = codec;
264 ret = snd_soc_register_dai(&ak4104_dai);
265 if (ret < 0) {
266 dev_err(&spi->dev, "failed to register DAI\n");
267 goto error_free_codec;
268 }
269
270 spi_set_drvdata(spi, ak4104);
271 dev_info(&spi->dev, "SPI device initialized\n");
272 return 0;
273
274error_free_codec:
275 kfree(ak4104);
276 ak4104_dai.dev = NULL;
277 return ret;
278}
279
280static int __devexit ak4104_spi_remove(struct spi_device *spi)
281{
282 int ret, val;
283 struct ak4104_private *ak4104 = spi_get_drvdata(spi);
284
285 val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1);
286 if (val < 0)
287 return val;
288
289
290 val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
291 ret = ak4104_spi_write(&ak4104->codec, AK4104_REG_CONTROL1, val);
292 if (ret < 0)
293 return ret;
294
295 ak4104_codec = NULL;
296 kfree(ak4104);
297 return 0;
298}
299
300static int ak4104_probe(struct platform_device *pdev)
301{
302 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
303 struct snd_soc_codec *codec = ak4104_codec;
304 int ret;
305
306
307 socdev->card->codec = codec;
308
309
310 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
311 if (ret < 0) {
312 dev_err(codec->dev, "failed to create pcms\n");
313 return ret;
314 }
315
316
317 ret = snd_soc_init_card(socdev);
318 if (ret < 0) {
319 dev_err(codec->dev, "failed to register card\n");
320 snd_soc_free_pcms(socdev);
321 return ret;
322 }
323
324 return 0;
325}
326
327static int ak4104_remove(struct platform_device *pdev)
328{
329 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
330 snd_soc_free_pcms(socdev);
331 return 0;
332};
333
334struct snd_soc_codec_device soc_codec_device_ak4104 = {
335 .probe = ak4104_probe,
336 .remove = ak4104_remove
337};
338EXPORT_SYMBOL_GPL(soc_codec_device_ak4104);
339
340static struct spi_driver ak4104_spi_driver = {
341 .driver = {
342 .name = DRV_NAME,
343 .owner = THIS_MODULE,
344 },
345 .probe = ak4104_spi_probe,
346 .remove = __devexit_p(ak4104_spi_remove),
347};
348
349static int __init ak4104_init(void)
350{
351 pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n");
352 return spi_register_driver(&ak4104_spi_driver);
353}
354module_init(ak4104_init);
355
356static void __exit ak4104_exit(void)
357{
358 spi_unregister_driver(&ak4104_spi_driver);
359}
360module_exit(ak4104_exit);
361
362MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
363MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
364MODULE_LICENSE("GPL");
365
366
