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Linux/sound/soc/codecs/pcm1681.c

  1 /*
  2  * PCM1681 ASoC codec driver
  3  *
  4  * Copyright (c) StreamUnlimited GmbH 2013
  5  *      Marek Belisko <marek.belisko@streamunlimited.com>
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * as published by the Free Software Foundation; either version 2
 10  * of the License, or (at your option) any later version.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  */
 17 
 18 #include <linux/module.h>
 19 #include <linux/slab.h>
 20 #include <linux/delay.h>
 21 #include <linux/gpio.h>
 22 #include <linux/i2c.h>
 23 #include <linux/regmap.h>
 24 #include <linux/of.h>
 25 #include <linux/of_device.h>
 26 #include <linux/of_gpio.h>
 27 #include <sound/pcm.h>
 28 #include <sound/pcm_params.h>
 29 #include <sound/soc.h>
 30 #include <sound/tlv.h>
 31 
 32 #define PCM1681_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE  |         \
 33                              SNDRV_PCM_FMTBIT_S24_LE)
 34 
 35 #define PCM1681_PCM_RATES   (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | \
 36                              SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100  | \
 37                              SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200  | \
 38                              SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000)
 39 
 40 #define PCM1681_SOFT_MUTE_ALL           0xff
 41 #define PCM1681_DEEMPH_RATE_MASK        0x18
 42 #define PCM1681_DEEMPH_MASK             0x01
 43 
 44 #define PCM1681_ATT_CONTROL(X)  (X <= 6 ? X : X + 9) /* Attenuation level */
 45 #define PCM1681_SOFT_MUTE       0x07    /* Soft mute control register */
 46 #define PCM1681_DAC_CONTROL     0x08    /* DAC operation control */
 47 #define PCM1681_FMT_CONTROL     0x09    /* Audio interface data format */
 48 #define PCM1681_DEEMPH_CONTROL  0x0a    /* De-emphasis control */
 49 #define PCM1681_ZERO_DETECT_STATUS      0x0e    /* Zero detect status reg */
 50 
 51 static const struct reg_default pcm1681_reg_defaults[] = {
 52         { 0x01, 0xff },
 53         { 0x02, 0xff },
 54         { 0x03, 0xff },
 55         { 0x04, 0xff },
 56         { 0x05, 0xff },
 57         { 0x06, 0xff },
 58         { 0x07, 0x00 },
 59         { 0x08, 0x00 },
 60         { 0x09, 0x06 },
 61         { 0x0A, 0x00 },
 62         { 0x0B, 0xff },
 63         { 0x0C, 0x0f },
 64         { 0x0D, 0x00 },
 65         { 0x10, 0xff },
 66         { 0x11, 0xff },
 67         { 0x12, 0x00 },
 68         { 0x13, 0x00 },
 69 };
 70 
 71 static bool pcm1681_accessible_reg(struct device *dev, unsigned int reg)
 72 {
 73         return !((reg == 0x00) || (reg == 0x0f));
 74 }
 75 
 76 static bool pcm1681_writeable_reg(struct device *dev, unsigned register reg)
 77 {
 78         return pcm1681_accessible_reg(dev, reg) &&
 79                 (reg != PCM1681_ZERO_DETECT_STATUS);
 80 }
 81 
 82 struct pcm1681_private {
 83         struct regmap *regmap;
 84         unsigned int format;
 85         /* Current deemphasis status */
 86         unsigned int deemph;
 87         /* Current rate for deemphasis control */
 88         unsigned int rate;
 89 };
 90 
 91 static const int pcm1681_deemph[] = { 44100, 48000, 32000 };
 92 
 93 static int pcm1681_set_deemph(struct snd_soc_codec *codec)
 94 {
 95         struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
 96         int i = 0, val = -1, enable = 0;
 97 
 98         if (priv->deemph)
 99                 for (i = 0; i < ARRAY_SIZE(pcm1681_deemph); i++)
100                         if (pcm1681_deemph[i] == priv->rate)
101                                 val = i;
102 
103         if (val != -1) {
104                 regmap_update_bits(priv->regmap, PCM1681_DEEMPH_CONTROL,
105                                         PCM1681_DEEMPH_RATE_MASK, val);
106                 enable = 1;
107         } else
108                 enable = 0;
109 
110         /* enable/disable deemphasis functionality */
111         return regmap_update_bits(priv->regmap, PCM1681_DEEMPH_CONTROL,
112                                         PCM1681_DEEMPH_MASK, enable);
113 }
114 
115 static int pcm1681_get_deemph(struct snd_kcontrol *kcontrol,
116                               struct snd_ctl_elem_value *ucontrol)
117 {
118         struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
119         struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
120 
121         ucontrol->value.enumerated.item[0] = priv->deemph;
122 
123         return 0;
124 }
125 
126 static int pcm1681_put_deemph(struct snd_kcontrol *kcontrol,
127                               struct snd_ctl_elem_value *ucontrol)
128 {
129         struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
130         struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
131 
132         priv->deemph = ucontrol->value.enumerated.item[0];
133 
134         return pcm1681_set_deemph(codec);
135 }
136 
137 static int pcm1681_set_dai_fmt(struct snd_soc_dai *codec_dai,
138                               unsigned int format)
139 {
140         struct snd_soc_codec *codec = codec_dai->codec;
141         struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
142 
143         /* The PCM1681 can only be slave to all clocks */
144         if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
145                 dev_err(codec->dev, "Invalid clocking mode\n");
146                 return -EINVAL;
147         }
148 
149         priv->format = format;
150 
151         return 0;
152 }
153 
154 static int pcm1681_digital_mute(struct snd_soc_dai *dai, int mute)
155 {
156         struct snd_soc_codec *codec = dai->codec;
157         struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
158         int val;
159 
160         if (mute)
161                 val = PCM1681_SOFT_MUTE_ALL;
162         else
163                 val = 0;
164 
165         return regmap_write(priv->regmap, PCM1681_SOFT_MUTE, val);
166 }
167 
168 static int pcm1681_hw_params(struct snd_pcm_substream *substream,
169                              struct snd_pcm_hw_params *params,
170                              struct snd_soc_dai *dai)
171 {
172         struct snd_soc_codec *codec = dai->codec;
173         struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
174         int val = 0, ret;
175 
176         priv->rate = params_rate(params);
177 
178         switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
179         case SND_SOC_DAIFMT_RIGHT_J:
180                 switch (params_width(params)) {
181                 case 24:
182                         val = 0;
183                         break;
184                 case 16:
185                         val = 3;
186                         break;
187                 default:
188                         return -EINVAL;
189                 }
190                 break;
191         case SND_SOC_DAIFMT_I2S:
192                 val = 0x04;
193                 break;
194         case SND_SOC_DAIFMT_LEFT_J:
195                 val = 0x05;
196                 break;
197         default:
198                 dev_err(codec->dev, "Invalid DAI format\n");
199                 return -EINVAL;
200         }
201 
202         ret = regmap_update_bits(priv->regmap, PCM1681_FMT_CONTROL, 0x0f, val);
203         if (ret < 0)
204                 return ret;
205 
206         return pcm1681_set_deemph(codec);
207 }
208 
209 static const struct snd_soc_dai_ops pcm1681_dai_ops = {
210         .set_fmt        = pcm1681_set_dai_fmt,
211         .hw_params      = pcm1681_hw_params,
212         .digital_mute   = pcm1681_digital_mute,
213 };
214 
215 static const struct snd_soc_dapm_widget pcm1681_dapm_widgets[] = {
216 SND_SOC_DAPM_OUTPUT("VOUT1"),
217 SND_SOC_DAPM_OUTPUT("VOUT2"),
218 SND_SOC_DAPM_OUTPUT("VOUT3"),
219 SND_SOC_DAPM_OUTPUT("VOUT4"),
220 SND_SOC_DAPM_OUTPUT("VOUT5"),
221 SND_SOC_DAPM_OUTPUT("VOUT6"),
222 SND_SOC_DAPM_OUTPUT("VOUT7"),
223 SND_SOC_DAPM_OUTPUT("VOUT8"),
224 };
225 
226 static const struct snd_soc_dapm_route pcm1681_dapm_routes[] = {
227         { "VOUT1", NULL, "Playback" },
228         { "VOUT2", NULL, "Playback" },
229         { "VOUT3", NULL, "Playback" },
230         { "VOUT4", NULL, "Playback" },
231         { "VOUT5", NULL, "Playback" },
232         { "VOUT6", NULL, "Playback" },
233         { "VOUT7", NULL, "Playback" },
234         { "VOUT8", NULL, "Playback" },
235 };
236 
237 static const DECLARE_TLV_DB_SCALE(pcm1681_dac_tlv, -6350, 50, 1);
238 
239 static const struct snd_kcontrol_new pcm1681_controls[] = {
240         SOC_DOUBLE_R_TLV("Channel 1/2 Playback Volume",
241                         PCM1681_ATT_CONTROL(1), PCM1681_ATT_CONTROL(2), 0,
242                         0x7f, 0, pcm1681_dac_tlv),
243         SOC_DOUBLE_R_TLV("Channel 3/4 Playback Volume",
244                         PCM1681_ATT_CONTROL(3), PCM1681_ATT_CONTROL(4), 0,
245                         0x7f, 0, pcm1681_dac_tlv),
246         SOC_DOUBLE_R_TLV("Channel 5/6 Playback Volume",
247                         PCM1681_ATT_CONTROL(5), PCM1681_ATT_CONTROL(6), 0,
248                         0x7f, 0, pcm1681_dac_tlv),
249         SOC_DOUBLE_R_TLV("Channel 7/8 Playback Volume",
250                         PCM1681_ATT_CONTROL(7), PCM1681_ATT_CONTROL(8), 0,
251                         0x7f, 0, pcm1681_dac_tlv),
252         SOC_SINGLE_BOOL_EXT("De-emphasis Switch", 0,
253                             pcm1681_get_deemph, pcm1681_put_deemph),
254 };
255 
256 static struct snd_soc_dai_driver pcm1681_dai = {
257         .name = "pcm1681-hifi",
258         .playback = {
259                 .stream_name = "Playback",
260                 .channels_min = 2,
261                 .channels_max = 8,
262                 .rates = PCM1681_PCM_RATES,
263                 .formats = PCM1681_PCM_FORMATS,
264         },
265         .ops = &pcm1681_dai_ops,
266 };
267 
268 #ifdef CONFIG_OF
269 static const struct of_device_id pcm1681_dt_ids[] = {
270         { .compatible = "ti,pcm1681", },
271         { }
272 };
273 MODULE_DEVICE_TABLE(of, pcm1681_dt_ids);
274 #endif
275 
276 static const struct regmap_config pcm1681_regmap = {
277         .reg_bits               = 8,
278         .val_bits               = 8,
279         .max_register           = 0x13,
280         .reg_defaults           = pcm1681_reg_defaults,
281         .num_reg_defaults       = ARRAY_SIZE(pcm1681_reg_defaults),
282         .writeable_reg          = pcm1681_writeable_reg,
283         .readable_reg           = pcm1681_accessible_reg,
284 };
285 
286 static struct snd_soc_codec_driver soc_codec_dev_pcm1681 = {
287         .controls               = pcm1681_controls,
288         .num_controls           = ARRAY_SIZE(pcm1681_controls),
289         .dapm_widgets           = pcm1681_dapm_widgets,
290         .num_dapm_widgets       = ARRAY_SIZE(pcm1681_dapm_widgets),
291         .dapm_routes            = pcm1681_dapm_routes,
292         .num_dapm_routes        = ARRAY_SIZE(pcm1681_dapm_routes),
293 };
294 
295 static const struct i2c_device_id pcm1681_i2c_id[] = {
296         {"pcm1681", 0},
297         {}
298 };
299 MODULE_DEVICE_TABLE(i2c, pcm1681_i2c_id);
300 
301 static int pcm1681_i2c_probe(struct i2c_client *client,
302                               const struct i2c_device_id *id)
303 {
304         int ret;
305         struct pcm1681_private *priv;
306 
307         priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
308         if (!priv)
309                 return -ENOMEM;
310 
311         priv->regmap = devm_regmap_init_i2c(client, &pcm1681_regmap);
312         if (IS_ERR(priv->regmap)) {
313                 ret = PTR_ERR(priv->regmap);
314                 dev_err(&client->dev, "Failed to create regmap: %d\n", ret);
315                 return ret;
316         }
317 
318         i2c_set_clientdata(client, priv);
319 
320         return snd_soc_register_codec(&client->dev, &soc_codec_dev_pcm1681,
321                 &pcm1681_dai, 1);
322 }
323 
324 static int pcm1681_i2c_remove(struct i2c_client *client)
325 {
326         snd_soc_unregister_codec(&client->dev);
327         return 0;
328 }
329 
330 static struct i2c_driver pcm1681_i2c_driver = {
331         .driver = {
332                 .name   = "pcm1681",
333                 .owner  = THIS_MODULE,
334                 .of_match_table = of_match_ptr(pcm1681_dt_ids),
335         },
336         .id_table       = pcm1681_i2c_id,
337         .probe          = pcm1681_i2c_probe,
338         .remove         = pcm1681_i2c_remove,
339 };
340 
341 module_i2c_driver(pcm1681_i2c_driver);
342 
343 MODULE_DESCRIPTION("Texas Instruments PCM1681 ALSA SoC Codec Driver");
344 MODULE_AUTHOR("Marek Belisko <marek.belisko@streamunlimited.com>");
345 MODULE_LICENSE("GPL");
346 

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