1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * max9850.c -- codec driver for max9850
4 *
5 * Copyright (C) 2011 taskit GmbH
6 *
7 * Author: Christian Glindkamp <christian.glindkamp@taskit.de>
8 *
9 * Initial development of this code was funded by
10 * MICRONIC Computer Systeme GmbH, https://www.mcsberlin.de/
11 */
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/i2c.h>
16 #include <linux/regmap.h>
17 #include <linux/slab.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
21 #include <sound/tlv.h>
22
23 #include "max9850.h"
24
25 struct max9850_priv {
26 struct regmap *regmap;
27 unsigned int sysclk;
28 };
29
30 /* these registers are not used at the moment but provided for the sake of
31 * completeness */
max9850_volatile_register(struct device * dev,unsigned int reg)32 static bool max9850_volatile_register(struct device *dev, unsigned int reg)
33 {
34 switch (reg) {
35 case MAX9850_STATUSA:
36 case MAX9850_STATUSB:
37 return true;
38 default:
39 return false;
40 }
41 }
42
43 static const struct regmap_config max9850_regmap = {
44 .reg_bits = 8,
45 .val_bits = 8,
46
47 .max_register = MAX9850_DIGITAL_AUDIO,
48 .volatile_reg = max9850_volatile_register,
49 .cache_type = REGCACHE_RBTREE,
50 };
51
52 static const DECLARE_TLV_DB_RANGE(max9850_tlv,
53 0x18, 0x1f, TLV_DB_SCALE_ITEM(-7450, 400, 0),
54 0x20, 0x33, TLV_DB_SCALE_ITEM(-4150, 200, 0),
55 0x34, 0x37, TLV_DB_SCALE_ITEM(-150, 100, 0),
56 0x38, 0x3f, TLV_DB_SCALE_ITEM(250, 50, 0)
57 );
58
59 static const struct snd_kcontrol_new max9850_controls[] = {
60 SOC_SINGLE_TLV("Headphone Volume", MAX9850_VOLUME, 0, 0x3f, 1, max9850_tlv),
61 SOC_SINGLE("Headphone Switch", MAX9850_VOLUME, 7, 1, 1),
62 SOC_SINGLE("Mono Switch", MAX9850_GENERAL_PURPOSE, 2, 1, 0),
63 };
64
65 static const struct snd_kcontrol_new max9850_mixer_controls[] = {
66 SOC_DAPM_SINGLE("Line In Switch", MAX9850_ENABLE, 1, 1, 0),
67 };
68
69 static const struct snd_soc_dapm_widget max9850_dapm_widgets[] = {
70 SND_SOC_DAPM_SUPPLY("Charge Pump 1", MAX9850_ENABLE, 4, 0, NULL, 0),
71 SND_SOC_DAPM_SUPPLY("Charge Pump 2", MAX9850_ENABLE, 5, 0, NULL, 0),
72 SND_SOC_DAPM_SUPPLY("MCLK", MAX9850_ENABLE, 6, 0, NULL, 0),
73 SND_SOC_DAPM_SUPPLY("SHDN", MAX9850_ENABLE, 7, 0, NULL, 0),
74 SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", MAX9850_ENABLE, 2, 0,
75 &max9850_mixer_controls[0],
76 ARRAY_SIZE(max9850_mixer_controls)),
77 SND_SOC_DAPM_PGA("Headphone Output", MAX9850_ENABLE, 3, 0, NULL, 0),
78 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", MAX9850_ENABLE, 0, 0),
79 SND_SOC_DAPM_OUTPUT("OUTL"),
80 SND_SOC_DAPM_OUTPUT("HPL"),
81 SND_SOC_DAPM_OUTPUT("OUTR"),
82 SND_SOC_DAPM_OUTPUT("HPR"),
83 SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
84 SND_SOC_DAPM_INPUT("INL"),
85 SND_SOC_DAPM_INPUT("INR"),
86 };
87
88 static const struct snd_soc_dapm_route max9850_dapm_routes[] = {
89 /* output mixer */
90 {"Output Mixer", NULL, "DAC"},
91 {"Output Mixer", "Line In Switch", "Line Input"},
92
93 /* outputs */
94 {"Headphone Output", NULL, "Output Mixer"},
95 {"HPL", NULL, "Headphone Output"},
96 {"HPR", NULL, "Headphone Output"},
97 {"OUTL", NULL, "Output Mixer"},
98 {"OUTR", NULL, "Output Mixer"},
99
100 /* inputs */
101 {"Line Input", NULL, "INL"},
102 {"Line Input", NULL, "INR"},
103
104 /* supplies */
105 {"Output Mixer", NULL, "Charge Pump 1"},
106 {"Output Mixer", NULL, "Charge Pump 2"},
107 {"Output Mixer", NULL, "SHDN"},
108 {"DAC", NULL, "MCLK"},
109 };
110
max9850_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)111 static int max9850_hw_params(struct snd_pcm_substream *substream,
112 struct snd_pcm_hw_params *params,
113 struct snd_soc_dai *dai)
114 {
115 struct snd_soc_component *component = dai->component;
116 struct max9850_priv *max9850 = snd_soc_component_get_drvdata(component);
117 u64 lrclk_div;
118 u8 sf, da;
119
120 if (!max9850->sysclk)
121 return -EINVAL;
122
123 /* lrclk_div = 2^22 * rate / iclk with iclk = mclk / sf */
124 sf = (snd_soc_component_read(component, MAX9850_CLOCK) >> 2) + 1;
125 lrclk_div = (1 << 22);
126 lrclk_div *= params_rate(params);
127 lrclk_div *= sf;
128 do_div(lrclk_div, max9850->sysclk);
129
130 snd_soc_component_write(component, MAX9850_LRCLK_MSB, (lrclk_div >> 8) & 0x7f);
131 snd_soc_component_write(component, MAX9850_LRCLK_LSB, lrclk_div & 0xff);
132
133 switch (params_width(params)) {
134 case 16:
135 da = 0;
136 break;
137 case 20:
138 da = 0x2;
139 break;
140 case 24:
141 da = 0x3;
142 break;
143 default:
144 return -EINVAL;
145 }
146 snd_soc_component_update_bits(component, MAX9850_DIGITAL_AUDIO, 0x3, da);
147
148 return 0;
149 }
150
max9850_set_dai_sysclk(struct snd_soc_dai * codec_dai,int clk_id,unsigned int freq,int dir)151 static int max9850_set_dai_sysclk(struct snd_soc_dai *codec_dai,
152 int clk_id, unsigned int freq, int dir)
153 {
154 struct snd_soc_component *component = codec_dai->component;
155 struct max9850_priv *max9850 = snd_soc_component_get_drvdata(component);
156
157 /* calculate mclk -> iclk divider */
158 if (freq <= 13000000)
159 snd_soc_component_write(component, MAX9850_CLOCK, 0x0);
160 else if (freq <= 26000000)
161 snd_soc_component_write(component, MAX9850_CLOCK, 0x4);
162 else if (freq <= 40000000)
163 snd_soc_component_write(component, MAX9850_CLOCK, 0x8);
164 else
165 return -EINVAL;
166
167 max9850->sysclk = freq;
168 return 0;
169 }
170
max9850_set_dai_fmt(struct snd_soc_dai * codec_dai,unsigned int fmt)171 static int max9850_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
172 {
173 struct snd_soc_component *component = codec_dai->component;
174 u8 da = 0;
175
176 /* set master/slave audio interface */
177 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
178 case SND_SOC_DAIFMT_CBM_CFM:
179 da |= MAX9850_MASTER;
180 break;
181 case SND_SOC_DAIFMT_CBS_CFS:
182 break;
183 default:
184 return -EINVAL;
185 }
186
187 /* interface format */
188 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
189 case SND_SOC_DAIFMT_I2S:
190 da |= MAX9850_DLY;
191 break;
192 case SND_SOC_DAIFMT_RIGHT_J:
193 da |= MAX9850_RTJ;
194 break;
195 case SND_SOC_DAIFMT_LEFT_J:
196 break;
197 default:
198 return -EINVAL;
199 }
200
201 /* clock inversion */
202 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
203 case SND_SOC_DAIFMT_NB_NF:
204 break;
205 case SND_SOC_DAIFMT_IB_IF:
206 da |= MAX9850_BCINV | MAX9850_INV;
207 break;
208 case SND_SOC_DAIFMT_IB_NF:
209 da |= MAX9850_BCINV;
210 break;
211 case SND_SOC_DAIFMT_NB_IF:
212 da |= MAX9850_INV;
213 break;
214 default:
215 return -EINVAL;
216 }
217
218 /* set da */
219 snd_soc_component_write(component, MAX9850_DIGITAL_AUDIO, da);
220
221 return 0;
222 }
223
max9850_set_bias_level(struct snd_soc_component * component,enum snd_soc_bias_level level)224 static int max9850_set_bias_level(struct snd_soc_component *component,
225 enum snd_soc_bias_level level)
226 {
227 struct max9850_priv *max9850 = snd_soc_component_get_drvdata(component);
228 int ret;
229
230 switch (level) {
231 case SND_SOC_BIAS_ON:
232 break;
233 case SND_SOC_BIAS_PREPARE:
234 break;
235 case SND_SOC_BIAS_STANDBY:
236 if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
237 ret = regcache_sync(max9850->regmap);
238 if (ret) {
239 dev_err(component->dev,
240 "Failed to sync cache: %d\n", ret);
241 return ret;
242 }
243 }
244 break;
245 case SND_SOC_BIAS_OFF:
246 break;
247 }
248 return 0;
249 }
250
251 #define MAX9850_RATES SNDRV_PCM_RATE_8000_48000
252
253 #define MAX9850_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
254 SNDRV_PCM_FMTBIT_S24_LE)
255
256 static const struct snd_soc_dai_ops max9850_dai_ops = {
257 .hw_params = max9850_hw_params,
258 .set_sysclk = max9850_set_dai_sysclk,
259 .set_fmt = max9850_set_dai_fmt,
260 };
261
262 static struct snd_soc_dai_driver max9850_dai = {
263 .name = "max9850-hifi",
264 .playback = {
265 .stream_name = "Playback",
266 .channels_min = 1,
267 .channels_max = 2,
268 .rates = MAX9850_RATES,
269 .formats = MAX9850_FORMATS
270 },
271 .ops = &max9850_dai_ops,
272 };
273
max9850_probe(struct snd_soc_component * component)274 static int max9850_probe(struct snd_soc_component *component)
275 {
276 /* enable zero-detect */
277 snd_soc_component_update_bits(component, MAX9850_GENERAL_PURPOSE, 1, 1);
278 /* enable slew-rate control */
279 snd_soc_component_update_bits(component, MAX9850_VOLUME, 0x40, 0x40);
280 /* set slew-rate 125ms */
281 snd_soc_component_update_bits(component, MAX9850_CHARGE_PUMP, 0xff, 0xc0);
282
283 return 0;
284 }
285
286 static const struct snd_soc_component_driver soc_component_dev_max9850 = {
287 .probe = max9850_probe,
288 .set_bias_level = max9850_set_bias_level,
289 .controls = max9850_controls,
290 .num_controls = ARRAY_SIZE(max9850_controls),
291 .dapm_widgets = max9850_dapm_widgets,
292 .num_dapm_widgets = ARRAY_SIZE(max9850_dapm_widgets),
293 .dapm_routes = max9850_dapm_routes,
294 .num_dapm_routes = ARRAY_SIZE(max9850_dapm_routes),
295 .suspend_bias_off = 1,
296 .idle_bias_on = 1,
297 .use_pmdown_time = 1,
298 .endianness = 1,
299 .non_legacy_dai_naming = 1,
300 };
301
max9850_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)302 static int max9850_i2c_probe(struct i2c_client *i2c,
303 const struct i2c_device_id *id)
304 {
305 struct max9850_priv *max9850;
306 int ret;
307
308 max9850 = devm_kzalloc(&i2c->dev, sizeof(struct max9850_priv),
309 GFP_KERNEL);
310 if (max9850 == NULL)
311 return -ENOMEM;
312
313 max9850->regmap = devm_regmap_init_i2c(i2c, &max9850_regmap);
314 if (IS_ERR(max9850->regmap))
315 return PTR_ERR(max9850->regmap);
316
317 i2c_set_clientdata(i2c, max9850);
318
319 ret = devm_snd_soc_register_component(&i2c->dev,
320 &soc_component_dev_max9850, &max9850_dai, 1);
321 return ret;
322 }
323
324 static const struct i2c_device_id max9850_i2c_id[] = {
325 { "max9850", 0 },
326 { }
327 };
328 MODULE_DEVICE_TABLE(i2c, max9850_i2c_id);
329
330 static struct i2c_driver max9850_i2c_driver = {
331 .driver = {
332 .name = "max9850",
333 },
334 .probe = max9850_i2c_probe,
335 .id_table = max9850_i2c_id,
336 };
337
338 module_i2c_driver(max9850_i2c_driver);
339
340 MODULE_AUTHOR("Christian Glindkamp <christian.glindkamp@taskit.de>");
341 MODULE_DESCRIPTION("ASoC MAX9850 codec driver");
342 MODULE_LICENSE("GPL");
343
