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>
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 /* AK4104 registers addresses */
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 /* Bit masks for AK4104 registers */
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
50 struct ak4104_private {
51 struct regmap *regmap;
52 };
53
ak4104_set_dai_fmt(struct snd_soc_dai * codec_dai,unsigned int format)54 static 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 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
59 int val = 0;
60 int ret;
61
62 /* set DAI format */
63 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
64 case SND_SOC_DAIFMT_RIGHT_J:
65 break;
66 case SND_SOC_DAIFMT_LEFT_J:
67 val |= AK4104_CONTROL1_DIF0;
68 break;
69 case SND_SOC_DAIFMT_I2S:
70 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
71 break;
72 default:
73 dev_err(codec->dev, "invalid dai format\n");
74 return -EINVAL;
75 }
76
77 /* This device can only be slave */
78 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
79 return -EINVAL;
80
81 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
82 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
83 val);
84 if (ret < 0)
85 return ret;
86
87 return 0;
88 }
89
ak4104_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)90 static int ak4104_hw_params(struct snd_pcm_substream *substream,
91 struct snd_pcm_hw_params *params,
92 struct snd_soc_dai *dai)
93 {
94 struct snd_soc_codec *codec = dai->codec;
95 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
96 int ret, val = 0;
97
98 /* set the IEC958 bits: consumer mode, no copyright bit */
99 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
100 regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);
101
102 val = 0;
103
104 switch (params_rate(params)) {
105 case 22050:
106 val |= IEC958_AES3_CON_FS_22050;
107 break;
108 case 24000:
109 val |= IEC958_AES3_CON_FS_24000;
110 break;
111 case 32000:
112 val |= IEC958_AES3_CON_FS_32000;
113 break;
114 case 44100:
115 val |= IEC958_AES3_CON_FS_44100;
116 break;
117 case 48000:
118 val |= IEC958_AES3_CON_FS_48000;
119 break;
120 case 88200:
121 val |= IEC958_AES3_CON_FS_88200;
122 break;
123 case 96000:
124 val |= IEC958_AES3_CON_FS_96000;
125 break;
126 case 176400:
127 val |= IEC958_AES3_CON_FS_176400;
128 break;
129 case 192000:
130 val |= IEC958_AES3_CON_FS_192000;
131 break;
132 default:
133 dev_err(codec->dev, "unsupported sampling rate\n");
134 return -EINVAL;
135 }
136
137 ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
138 if (ret < 0)
139 return ret;
140
141 /* enable transmitter */
142 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
143 AK4104_TX_TXE, AK4104_TX_TXE);
144 if (ret < 0)
145 return ret;
146
147 return 0;
148 }
149
ak4104_hw_free(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)150 static int ak4104_hw_free(struct snd_pcm_substream *substream,
151 struct snd_soc_dai *dai)
152 {
153 struct snd_soc_codec *codec = dai->codec;
154 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
155
156 /* disable transmitter */
157 return regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
158 AK4104_TX_TXE, 0);
159 }
160
161 static const struct snd_soc_dai_ops ak4101_dai_ops = {
162 .hw_params = ak4104_hw_params,
163 .hw_free = ak4104_hw_free,
164 .set_fmt = ak4104_set_dai_fmt,
165 };
166
167 static struct snd_soc_dai_driver ak4104_dai = {
168 .name = "ak4104-hifi",
169 .playback = {
170 .stream_name = "Playback",
171 .channels_min = 2,
172 .channels_max = 2,
173 .rates = SNDRV_PCM_RATE_8000_192000,
174 .formats = SNDRV_PCM_FMTBIT_S16_LE |
175 SNDRV_PCM_FMTBIT_S24_3LE |
176 SNDRV_PCM_FMTBIT_S24_LE
177 },
178 .ops = &ak4101_dai_ops,
179 };
180
ak4104_probe(struct snd_soc_codec * codec)181 static int ak4104_probe(struct snd_soc_codec *codec)
182 {
183 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
184 int ret;
185
186 codec->control_data = ak4104->regmap;
187
188 /* set power-up and non-reset bits */
189 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
190 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
191 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
192 if (ret < 0)
193 return ret;
194
195 /* enable transmitter */
196 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
197 AK4104_TX_TXE, AK4104_TX_TXE);
198 if (ret < 0)
199 return ret;
200
201 return 0;
202 }
203
ak4104_remove(struct snd_soc_codec * codec)204 static int ak4104_remove(struct snd_soc_codec *codec)
205 {
206 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
207
208 regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
209 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
210
211 return 0;
212 }
213
214 static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
215 .probe = ak4104_probe,
216 .remove = ak4104_remove,
217 };
218
219 static const struct regmap_config ak4104_regmap = {
220 .reg_bits = 8,
221 .val_bits = 8,
222
223 .max_register = AK4104_NUM_REGS - 1,
224 .read_flag_mask = AK4104_READ,
225 .write_flag_mask = AK4104_WRITE,
226
227 .cache_type = REGCACHE_RBTREE,
228 };
229
ak4104_spi_probe(struct spi_device * spi)230 static int ak4104_spi_probe(struct spi_device *spi)
231 {
232 struct device_node *np = spi->dev.of_node;
233 struct ak4104_private *ak4104;
234 unsigned int val;
235 int ret;
236
237 spi->bits_per_word = 8;
238 spi->mode = SPI_MODE_0;
239 ret = spi_setup(spi);
240 if (ret < 0)
241 return ret;
242
243 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
244 GFP_KERNEL);
245 if (ak4104 == NULL)
246 return -ENOMEM;
247
248 ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
249 if (IS_ERR(ak4104->regmap)) {
250 ret = PTR_ERR(ak4104->regmap);
251 return ret;
252 }
253
254 if (np) {
255 enum of_gpio_flags flags;
256 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
257
258 if (gpio_is_valid(gpio)) {
259 ret = devm_gpio_request_one(&spi->dev, gpio,
260 flags & OF_GPIO_ACTIVE_LOW ?
261 GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
262 "ak4104 reset");
263 if (ret < 0)
264 return ret;
265 }
266 }
267
268 /* read the 'reserved' register - according to the datasheet, it
269 * should contain 0x5b. Not a good way to verify the presence of
270 * the device, but there is no hardware ID register. */
271 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
272 if (ret != 0)
273 return ret;
274 if (val != AK4104_RESERVED_VAL)
275 return -ENODEV;
276
277 spi_set_drvdata(spi, ak4104);
278
279 ret = snd_soc_register_codec(&spi->dev,
280 &soc_codec_device_ak4104, &ak4104_dai, 1);
281 return ret;
282 }
283
ak4104_spi_remove(struct spi_device * spi)284 static int ak4104_spi_remove(struct spi_device *spi)
285 {
286 snd_soc_unregister_codec(&spi->dev);
287 return 0;
288 }
289
290 static const struct of_device_id ak4104_of_match[] = {
291 { .compatible = "asahi-kasei,ak4104", },
292 { }
293 };
294 MODULE_DEVICE_TABLE(of, ak4104_of_match);
295
296 static struct spi_driver ak4104_spi_driver = {
297 .driver = {
298 .name = DRV_NAME,
299 .owner = THIS_MODULE,
300 .of_match_table = ak4104_of_match,
301 },
302 .probe = ak4104_spi_probe,
303 .remove = ak4104_spi_remove,
304 };
305
306 module_spi_driver(ak4104_spi_driver);
307
308 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
309 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
310 MODULE_LICENSE("GPL");
311
312