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a381934e DM |
1 | /* |
2 | * AK4104 ALSA SoC (ASoC) driver | |
3 | * | |
4 | * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
a381934e DM |
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 | ||
a381934e DM |
20 | /* AK4104 registers addresses */ |
21 | #define AK4104_REG_CONTROL1 0x00 | |
22 | #define AK4104_REG_RESERVED 0x01 | |
23 | #define AK4104_REG_CONTROL2 0x02 | |
24 | #define AK4104_REG_TX 0x03 | |
25 | #define AK4104_REG_CHN_STATUS(x) ((x) + 0x04) | |
26 | #define AK4104_NUM_REGS 10 | |
27 | ||
28 | #define AK4104_REG_MASK 0x1f | |
29 | #define AK4104_READ 0xc0 | |
30 | #define AK4104_WRITE 0xe0 | |
31 | #define AK4104_RESERVED_VAL 0x5b | |
32 | ||
33 | /* Bit masks for AK4104 registers */ | |
34 | #define AK4104_CONTROL1_RSTN (1 << 0) | |
35 | #define AK4104_CONTROL1_PW (1 << 1) | |
36 | #define AK4104_CONTROL1_DIF0 (1 << 2) | |
37 | #define AK4104_CONTROL1_DIF1 (1 << 3) | |
38 | ||
39 | #define AK4104_CONTROL2_SEL0 (1 << 0) | |
40 | #define AK4104_CONTROL2_SEL1 (1 << 1) | |
41 | #define AK4104_CONTROL2_MODE (1 << 2) | |
42 | ||
43 | #define AK4104_TX_TXE (1 << 0) | |
44 | #define AK4104_TX_V (1 << 1) | |
45 | ||
f0fba2ad | 46 | #define DRV_NAME "ak4104-codec" |
a381934e DM |
47 | |
48 | struct ak4104_private { | |
f0fba2ad LG |
49 | enum snd_soc_control_type control_type; |
50 | void *control_data; | |
a381934e DM |
51 | }; |
52 | ||
53 | static int ak4104_fill_cache(struct snd_soc_codec *codec) | |
54 | { | |
55 | int i; | |
56 | u8 *reg_cache = codec->reg_cache; | |
57 | struct spi_device *spi = codec->control_data; | |
58 | ||
f0fba2ad | 59 | for (i = 0; i < codec->driver->reg_cache_size; i++) { |
a381934e DM |
60 | int ret = spi_w8r8(spi, i | AK4104_READ); |
61 | if (ret < 0) { | |
62 | dev_err(&spi->dev, "SPI write failure\n"); | |
63 | return ret; | |
64 | } | |
65 | ||
66 | reg_cache[i] = ret; | |
67 | } | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec, | |
73 | unsigned int reg) | |
74 | { | |
75 | u8 *reg_cache = codec->reg_cache; | |
76 | ||
f0fba2ad | 77 | if (reg >= codec->driver->reg_cache_size) |
a381934e DM |
78 | return -EINVAL; |
79 | ||
80 | return reg_cache[reg]; | |
81 | } | |
82 | ||
83 | static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg, | |
84 | unsigned int value) | |
85 | { | |
86 | u8 *cache = codec->reg_cache; | |
87 | struct spi_device *spi = codec->control_data; | |
88 | ||
f0fba2ad | 89 | if (reg >= codec->driver->reg_cache_size) |
a381934e DM |
90 | return -EINVAL; |
91 | ||
a381934e DM |
92 | /* only write to the hardware if value has changed */ |
93 | if (cache[reg] != value) { | |
e555317c DM |
94 | u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, value }; |
95 | ||
a381934e DM |
96 | if (spi_write(spi, tmp, sizeof(tmp))) { |
97 | dev_err(&spi->dev, "SPI write failed\n"); | |
98 | return -EIO; | |
99 | } | |
100 | ||
101 | cache[reg] = value; | |
102 | } | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai, | |
108 | unsigned int format) | |
109 | { | |
110 | struct snd_soc_codec *codec = codec_dai->codec; | |
111 | int val = 0; | |
112 | ||
113 | val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1); | |
114 | if (val < 0) | |
115 | return val; | |
116 | ||
117 | val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1); | |
118 | ||
119 | /* set DAI format */ | |
120 | switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { | |
121 | case SND_SOC_DAIFMT_RIGHT_J: | |
122 | break; | |
123 | case SND_SOC_DAIFMT_LEFT_J: | |
124 | val |= AK4104_CONTROL1_DIF0; | |
125 | break; | |
126 | case SND_SOC_DAIFMT_I2S: | |
127 | val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1; | |
128 | break; | |
129 | default: | |
130 | dev_err(codec->dev, "invalid dai format\n"); | |
131 | return -EINVAL; | |
132 | } | |
133 | ||
134 | /* This device can only be slave */ | |
135 | if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) | |
136 | return -EINVAL; | |
137 | ||
138 | return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val); | |
139 | } | |
140 | ||
141 | static int ak4104_hw_params(struct snd_pcm_substream *substream, | |
142 | struct snd_pcm_hw_params *params, | |
143 | struct snd_soc_dai *dai) | |
144 | { | |
145 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
f0fba2ad | 146 | struct snd_soc_codec *codec = rtd->codec; |
a381934e DM |
147 | int val = 0; |
148 | ||
149 | /* set the IEC958 bits: consumer mode, no copyright bit */ | |
150 | val |= IEC958_AES0_CON_NOT_COPYRIGHT; | |
151 | ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val); | |
152 | ||
153 | val = 0; | |
154 | ||
155 | switch (params_rate(params)) { | |
156 | case 44100: | |
157 | val |= IEC958_AES3_CON_FS_44100; | |
158 | break; | |
159 | case 48000: | |
160 | val |= IEC958_AES3_CON_FS_48000; | |
161 | break; | |
162 | case 32000: | |
163 | val |= IEC958_AES3_CON_FS_32000; | |
164 | break; | |
165 | default: | |
166 | dev_err(codec->dev, "unsupported sampling rate\n"); | |
167 | return -EINVAL; | |
168 | } | |
169 | ||
170 | return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val); | |
171 | } | |
172 | ||
65ec1cd1 MB |
173 | static struct snd_soc_dai_ops ak4101_dai_ops = { |
174 | .hw_params = ak4104_hw_params, | |
175 | .set_fmt = ak4104_set_dai_fmt, | |
176 | }; | |
177 | ||
f0fba2ad LG |
178 | static struct snd_soc_dai_driver ak4104_dai = { |
179 | .name = "ak4104-hifi", | |
a381934e DM |
180 | .playback = { |
181 | .stream_name = "Playback", | |
182 | .channels_min = 2, | |
183 | .channels_max = 2, | |
617b14c5 | 184 | .rates = SNDRV_PCM_RATE_8000_192000, |
a381934e DM |
185 | .formats = SNDRV_PCM_FMTBIT_S16_LE | |
186 | SNDRV_PCM_FMTBIT_S24_3LE | | |
187 | SNDRV_PCM_FMTBIT_S24_LE | |
188 | }, | |
65ec1cd1 | 189 | .ops = &ak4101_dai_ops, |
a381934e DM |
190 | }; |
191 | ||
f0fba2ad | 192 | static int ak4104_probe(struct snd_soc_codec *codec) |
a381934e | 193 | { |
f0fba2ad | 194 | struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); |
a381934e DM |
195 | int ret, val; |
196 | ||
f0fba2ad | 197 | codec->control_data = ak4104->control_data; |
a381934e DM |
198 | |
199 | /* read all regs and fill the cache */ | |
200 | ret = ak4104_fill_cache(codec); | |
201 | if (ret < 0) { | |
f0fba2ad | 202 | dev_err(codec->dev, "failed to fill register cache\n"); |
a381934e DM |
203 | return ret; |
204 | } | |
205 | ||
206 | /* read the 'reserved' register - according to the datasheet, it | |
207 | * should contain 0x5b. Not a good way to verify the presence of | |
208 | * the device, but there is no hardware ID register. */ | |
209 | if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) != | |
f0fba2ad LG |
210 | AK4104_RESERVED_VAL) |
211 | return -ENODEV; | |
a381934e DM |
212 | |
213 | /* set power-up and non-reset bits */ | |
214 | val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1); | |
215 | val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN; | |
216 | ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val); | |
217 | if (ret < 0) | |
f0fba2ad | 218 | return ret; |
a381934e DM |
219 | |
220 | /* enable transmitter */ | |
221 | val = ak4104_read_reg_cache(codec, AK4104_REG_TX); | |
222 | val |= AK4104_TX_TXE; | |
223 | ret = ak4104_spi_write(codec, AK4104_REG_TX, val); | |
224 | if (ret < 0) | |
f0fba2ad | 225 | return ret; |
a381934e | 226 | |
f0fba2ad | 227 | dev_info(codec->dev, "SPI device initialized\n"); |
a381934e | 228 | return 0; |
a381934e DM |
229 | } |
230 | ||
f0fba2ad | 231 | static int ak4104_remove(struct snd_soc_codec *codec) |
a381934e | 232 | { |
f0fba2ad | 233 | int val, ret; |
a381934e | 234 | |
f0fba2ad | 235 | val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1); |
a381934e DM |
236 | if (val < 0) |
237 | return val; | |
238 | ||
239 | /* clear power-up and non-reset bits */ | |
240 | val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); | |
f0fba2ad | 241 | ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val); |
a381934e | 242 | |
f0fba2ad | 243 | return ret; |
a381934e DM |
244 | } |
245 | ||
f0fba2ad LG |
246 | static struct snd_soc_codec_driver soc_codec_device_ak4104 = { |
247 | .probe = ak4104_probe, | |
248 | .remove = ak4104_remove, | |
249 | .reg_cache_size = AK4104_NUM_REGS, | |
250 | .reg_word_size = sizeof(u16), | |
251 | }; | |
252 | ||
253 | static int ak4104_spi_probe(struct spi_device *spi) | |
a381934e | 254 | { |
f0fba2ad | 255 | struct ak4104_private *ak4104; |
a381934e DM |
256 | int ret; |
257 | ||
f0fba2ad LG |
258 | spi->bits_per_word = 8; |
259 | spi->mode = SPI_MODE_0; | |
260 | ret = spi_setup(spi); | |
261 | if (ret < 0) | |
a381934e | 262 | return ret; |
a381934e | 263 | |
f0fba2ad LG |
264 | ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL); |
265 | if (ak4104 == NULL) | |
266 | return -ENOMEM; | |
267 | ||
268 | ak4104->control_data = spi; | |
269 | ak4104->control_type = SND_SOC_SPI; | |
270 | spi_set_drvdata(spi, ak4104); | |
271 | ||
272 | ret = snd_soc_register_codec(&spi->dev, | |
273 | &soc_codec_device_ak4104, &ak4104_dai, 1); | |
274 | if (ret < 0) | |
275 | kfree(ak4104); | |
276 | return ret; | |
a381934e DM |
277 | } |
278 | ||
f0fba2ad | 279 | static int __devexit ak4104_spi_remove(struct spi_device *spi) |
a381934e | 280 | { |
f0fba2ad LG |
281 | snd_soc_unregister_codec(&spi->dev); |
282 | kfree(spi_get_drvdata(spi)); | |
a381934e | 283 | return 0; |
f0fba2ad | 284 | } |
a381934e DM |
285 | |
286 | static struct spi_driver ak4104_spi_driver = { | |
287 | .driver = { | |
288 | .name = DRV_NAME, | |
289 | .owner = THIS_MODULE, | |
290 | }, | |
291 | .probe = ak4104_spi_probe, | |
292 | .remove = __devexit_p(ak4104_spi_remove), | |
293 | }; | |
294 | ||
295 | static int __init ak4104_init(void) | |
296 | { | |
297 | pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n"); | |
298 | return spi_register_driver(&ak4104_spi_driver); | |
299 | } | |
300 | module_init(ak4104_init); | |
301 | ||
302 | static void __exit ak4104_exit(void) | |
303 | { | |
304 | spi_unregister_driver(&ak4104_spi_driver); | |
305 | } | |
306 | module_exit(ak4104_exit); | |
307 | ||
308 | MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); | |
309 | MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); | |
310 | MODULE_LICENSE("GPL"); | |
311 |