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Linux/sound/soc/codecs/max9850.c

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  1 /*
  2  * max9850.c  --  codec driver for max9850
  3  *
  4  * Copyright (C) 2011 taskit GmbH
  5  *
  6  * Author: Christian Glindkamp <christian.glindkamp@taskit.de>
  7  *
  8  * Initial development of this code was funded by
  9  * MICRONIC Computer Systeme GmbH, http://www.mcsberlin.de/
 10  *
 11  * This program is free software; you can redistribute  it and/or modify it
 12  * under  the terms of  the GNU General  Public License as published by the
 13  * Free Software Foundation;  either version 2 of the  License, or (at your
 14  * option) any later version.
 15  *
 16  */
 17 
 18 #include <linux/module.h>
 19 #include <linux/init.h>
 20 #include <linux/i2c.h>
 21 #include <linux/regmap.h>
 22 #include <linux/slab.h>
 23 #include <sound/pcm.h>
 24 #include <sound/pcm_params.h>
 25 #include <sound/soc.h>
 26 #include <sound/tlv.h>
 27 
 28 #include "max9850.h"
 29 
 30 struct max9850_priv {
 31         struct regmap *regmap;
 32         unsigned int sysclk;
 33 };
 34 
 35 /* max9850 register cache */
 36 static const struct reg_default max9850_reg[] = {
 37         {  2, 0x0c },
 38         {  3, 0x00 },
 39         {  4, 0x00 },
 40         {  5, 0x00 },
 41         {  6, 0x00 },
 42         {  7, 0x00 },
 43         {  8, 0x00 },
 44         {  9, 0x00 },
 45         { 10, 0x00 },
 46 };
 47 
 48 /* these registers are not used at the moment but provided for the sake of
 49  * completeness */
 50 static bool max9850_volatile_register(struct device *dev, unsigned int reg)
 51 {
 52         switch (reg) {
 53         case MAX9850_STATUSA:
 54         case MAX9850_STATUSB:
 55                 return 1;
 56         default:
 57                 return 0;
 58         }
 59 }
 60 
 61 static const struct regmap_config max9850_regmap = {
 62         .reg_bits = 8,
 63         .val_bits = 8,
 64 
 65         .max_register = MAX9850_DIGITAL_AUDIO,
 66         .volatile_reg = max9850_volatile_register,
 67         .cache_type = REGCACHE_RBTREE,
 68 };
 69 
 70 static const DECLARE_TLV_DB_RANGE(max9850_tlv,
 71         0x18, 0x1f, TLV_DB_SCALE_ITEM(-7450, 400, 0),
 72         0x20, 0x33, TLV_DB_SCALE_ITEM(-4150, 200, 0),
 73         0x34, 0x37, TLV_DB_SCALE_ITEM(-150, 100, 0),
 74         0x38, 0x3f, TLV_DB_SCALE_ITEM(250, 50, 0)
 75 );
 76 
 77 static const struct snd_kcontrol_new max9850_controls[] = {
 78 SOC_SINGLE_TLV("Headphone Volume", MAX9850_VOLUME, 0, 0x3f, 1, max9850_tlv),
 79 SOC_SINGLE("Headphone Switch", MAX9850_VOLUME, 7, 1, 1),
 80 SOC_SINGLE("Mono Switch", MAX9850_GENERAL_PURPOSE, 2, 1, 0),
 81 };
 82 
 83 static const struct snd_kcontrol_new max9850_mixer_controls[] = {
 84         SOC_DAPM_SINGLE("Line In Switch", MAX9850_ENABLE, 1, 1, 0),
 85 };
 86 
 87 static const struct snd_soc_dapm_widget max9850_dapm_widgets[] = {
 88 SND_SOC_DAPM_SUPPLY("Charge Pump 1", MAX9850_ENABLE, 4, 0, NULL, 0),
 89 SND_SOC_DAPM_SUPPLY("Charge Pump 2", MAX9850_ENABLE, 5, 0, NULL, 0),
 90 SND_SOC_DAPM_SUPPLY("MCLK", MAX9850_ENABLE, 6, 0, NULL, 0),
 91 SND_SOC_DAPM_SUPPLY("SHDN", MAX9850_ENABLE, 7, 0, NULL, 0),
 92 SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", MAX9850_ENABLE, 2, 0,
 93                 &max9850_mixer_controls[0],
 94                 ARRAY_SIZE(max9850_mixer_controls)),
 95 SND_SOC_DAPM_PGA("Headphone Output", MAX9850_ENABLE, 3, 0, NULL, 0),
 96 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", MAX9850_ENABLE, 0, 0),
 97 SND_SOC_DAPM_OUTPUT("OUTL"),
 98 SND_SOC_DAPM_OUTPUT("HPL"),
 99 SND_SOC_DAPM_OUTPUT("OUTR"),
100 SND_SOC_DAPM_OUTPUT("HPR"),
101 SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
102 SND_SOC_DAPM_INPUT("INL"),
103 SND_SOC_DAPM_INPUT("INR"),
104 };
105 
106 static const struct snd_soc_dapm_route max9850_dapm_routes[] = {
107         /* output mixer */
108         {"Output Mixer", NULL, "DAC"},
109         {"Output Mixer", "Line In Switch", "Line Input"},
110 
111         /* outputs */
112         {"Headphone Output", NULL, "Output Mixer"},
113         {"HPL", NULL, "Headphone Output"},
114         {"HPR", NULL, "Headphone Output"},
115         {"OUTL", NULL, "Output Mixer"},
116         {"OUTR", NULL, "Output Mixer"},
117 
118         /* inputs */
119         {"Line Input", NULL, "INL"},
120         {"Line Input", NULL, "INR"},
121 
122         /* supplies */
123         {"Output Mixer", NULL, "Charge Pump 1"},
124         {"Output Mixer", NULL, "Charge Pump 2"},
125         {"Output Mixer", NULL, "SHDN"},
126         {"DAC", NULL, "MCLK"},
127 };
128 
129 static int max9850_hw_params(struct snd_pcm_substream *substream,
130                              struct snd_pcm_hw_params *params,
131                              struct snd_soc_dai *dai)
132 {
133         struct snd_soc_component *component = dai->component;
134         struct max9850_priv *max9850 = snd_soc_component_get_drvdata(component);
135         u64 lrclk_div;
136         u8 sf, da;
137 
138         if (!max9850->sysclk)
139                 return -EINVAL;
140 
141         /* lrclk_div = 2^22 * rate / iclk with iclk = mclk / sf */
142         sf = (snd_soc_component_read32(component, MAX9850_CLOCK) >> 2) + 1;
143         lrclk_div = (1 << 22);
144         lrclk_div *= params_rate(params);
145         lrclk_div *= sf;
146         do_div(lrclk_div, max9850->sysclk);
147 
148         snd_soc_component_write(component, MAX9850_LRCLK_MSB, (lrclk_div >> 8) & 0x7f);
149         snd_soc_component_write(component, MAX9850_LRCLK_LSB, lrclk_div & 0xff);
150 
151         switch (params_width(params)) {
152         case 16:
153                 da = 0;
154                 break;
155         case 20:
156                 da = 0x2;
157                 break;
158         case 24:
159                 da = 0x3;
160                 break;
161         default:
162                 return -EINVAL;
163         }
164         snd_soc_component_update_bits(component, MAX9850_DIGITAL_AUDIO, 0x3, da);
165 
166         return 0;
167 }
168 
169 static int max9850_set_dai_sysclk(struct snd_soc_dai *codec_dai,
170                 int clk_id, unsigned int freq, int dir)
171 {
172         struct snd_soc_component *component = codec_dai->component;
173         struct max9850_priv *max9850 = snd_soc_component_get_drvdata(component);
174 
175         /* calculate mclk -> iclk divider */
176         if (freq <= 13000000)
177                 snd_soc_component_write(component, MAX9850_CLOCK, 0x0);
178         else if (freq <= 26000000)
179                 snd_soc_component_write(component, MAX9850_CLOCK, 0x4);
180         else if (freq <= 40000000)
181                 snd_soc_component_write(component, MAX9850_CLOCK, 0x8);
182         else
183                 return -EINVAL;
184 
185         max9850->sysclk = freq;
186         return 0;
187 }
188 
189 static int max9850_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
190 {
191         struct snd_soc_component *component = codec_dai->component;
192         u8 da = 0;
193 
194         /* set master/slave audio interface */
195         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
196         case SND_SOC_DAIFMT_CBM_CFM:
197                 da |= MAX9850_MASTER;
198                 break;
199         case SND_SOC_DAIFMT_CBS_CFS:
200                 break;
201         default:
202                 return -EINVAL;
203         }
204 
205         /* interface format */
206         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
207         case SND_SOC_DAIFMT_I2S:
208                 da |= MAX9850_DLY;
209                 break;
210         case SND_SOC_DAIFMT_RIGHT_J:
211                 da |= MAX9850_RTJ;
212                 break;
213         case SND_SOC_DAIFMT_LEFT_J:
214                 break;
215         default:
216                 return -EINVAL;
217         }
218 
219         /* clock inversion */
220         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
221         case SND_SOC_DAIFMT_NB_NF:
222                 break;
223         case SND_SOC_DAIFMT_IB_IF:
224                 da |= MAX9850_BCINV | MAX9850_INV;
225                 break;
226         case SND_SOC_DAIFMT_IB_NF:
227                 da |= MAX9850_BCINV;
228                 break;
229         case SND_SOC_DAIFMT_NB_IF:
230                 da |= MAX9850_INV;
231                 break;
232         default:
233                 return -EINVAL;
234         }
235 
236         /* set da */
237         snd_soc_component_write(component, MAX9850_DIGITAL_AUDIO, da);
238 
239         return 0;
240 }
241 
242 static int max9850_set_bias_level(struct snd_soc_component *component,
243                                   enum snd_soc_bias_level level)
244 {
245         struct max9850_priv *max9850 = snd_soc_component_get_drvdata(component);
246         int ret;
247 
248         switch (level) {
249         case SND_SOC_BIAS_ON:
250                 break;
251         case SND_SOC_BIAS_PREPARE:
252                 break;
253         case SND_SOC_BIAS_STANDBY:
254                 if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
255                         ret = regcache_sync(max9850->regmap);
256                         if (ret) {
257                                 dev_err(component->dev,
258                                         "Failed to sync cache: %d\n", ret);
259                                 return ret;
260                         }
261                 }
262                 break;
263         case SND_SOC_BIAS_OFF:
264                 break;
265         }
266         return 0;
267 }
268 
269 #define MAX9850_RATES SNDRV_PCM_RATE_8000_48000
270 
271 #define MAX9850_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
272         SNDRV_PCM_FMTBIT_S24_LE)
273 
274 static const struct snd_soc_dai_ops max9850_dai_ops = {
275         .hw_params      = max9850_hw_params,
276         .set_sysclk     = max9850_set_dai_sysclk,
277         .set_fmt        = max9850_set_dai_fmt,
278 };
279 
280 static struct snd_soc_dai_driver max9850_dai = {
281         .name = "max9850-hifi",
282         .playback = {
283                 .stream_name = "Playback",
284                 .channels_min = 1,
285                 .channels_max = 2,
286                 .rates = MAX9850_RATES,
287                 .formats = MAX9850_FORMATS
288         },
289         .ops = &max9850_dai_ops,
290 };
291 
292 static int max9850_probe(struct snd_soc_component *component)
293 {
294         /* enable zero-detect */
295         snd_soc_component_update_bits(component, MAX9850_GENERAL_PURPOSE, 1, 1);
296         /* enable slew-rate control */
297         snd_soc_component_update_bits(component, MAX9850_VOLUME, 0x40, 0x40);
298         /* set slew-rate 125ms */
299         snd_soc_component_update_bits(component, MAX9850_CHARGE_PUMP, 0xff, 0xc0);
300 
301         return 0;
302 }
303 
304 static const struct snd_soc_component_driver soc_component_dev_max9850 = {
305         .probe                  = max9850_probe,
306         .set_bias_level         = max9850_set_bias_level,
307         .controls               = max9850_controls,
308         .num_controls           = ARRAY_SIZE(max9850_controls),
309         .dapm_widgets           = max9850_dapm_widgets,
310         .num_dapm_widgets       = ARRAY_SIZE(max9850_dapm_widgets),
311         .dapm_routes            = max9850_dapm_routes,
312         .num_dapm_routes        = ARRAY_SIZE(max9850_dapm_routes),
313         .suspend_bias_off       = 1,
314         .idle_bias_on           = 1,
315         .use_pmdown_time        = 1,
316         .endianness             = 1,
317         .non_legacy_dai_naming  = 1,
318 };
319 
320 static int max9850_i2c_probe(struct i2c_client *i2c,
321                              const struct i2c_device_id *id)
322 {
323         struct max9850_priv *max9850;
324         int ret;
325 
326         max9850 = devm_kzalloc(&i2c->dev, sizeof(struct max9850_priv),
327                                GFP_KERNEL);
328         if (max9850 == NULL)
329                 return -ENOMEM;
330 
331         max9850->regmap = devm_regmap_init_i2c(i2c, &max9850_regmap);
332         if (IS_ERR(max9850->regmap))
333                 return PTR_ERR(max9850->regmap);
334 
335         i2c_set_clientdata(i2c, max9850);
336 
337         ret = devm_snd_soc_register_component(&i2c->dev,
338                         &soc_component_dev_max9850, &max9850_dai, 1);
339         return ret;
340 }
341 
342 static const struct i2c_device_id max9850_i2c_id[] = {
343         { "max9850", 0 },
344         { }
345 };
346 MODULE_DEVICE_TABLE(i2c, max9850_i2c_id);
347 
348 static struct i2c_driver max9850_i2c_driver = {
349         .driver = {
350                 .name = "max9850",
351         },
352         .probe = max9850_i2c_probe,
353         .id_table = max9850_i2c_id,
354 };
355 
356 module_i2c_driver(max9850_i2c_driver);
357 
358 MODULE_AUTHOR("Christian Glindkamp <christian.glindkamp@taskit.de>");
359 MODULE_DESCRIPTION("ASoC MAX9850 codec driver");
360 MODULE_LICENSE("GPL");
361 

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