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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * MAX98504 ALSA SoC Audio driver
4  *
5  * Copyright 2013 - 2014 Maxim Integrated Products
6  * Copyright 2016 Samsung Electronics Co., Ltd.
7  */
8
9 #include <linux/delay.h>
10 #include <linux/i2c.h>
11 #include <linux/module.h>
12 #include <linux/regulator/consumer.h>
13 #include <linux/slab.h>
14 #include <linux/types.h>
15 #include <sound/soc.h>
16
17 #include "max98504.h"
18
19 static const char * const max98504_supply_names[] = {
20         "DVDD",
21         "DIOVDD",
22         "PVDD",
23 };
24 #define MAX98504_NUM_SUPPLIES ARRAY_SIZE(max98504_supply_names)
25
26 struct max98504_priv {
27         struct regmap *regmap;
28         struct regulator_bulk_data supplies[MAX98504_NUM_SUPPLIES];
29         unsigned int pcm_rx_channels;
30         bool brownout_enable;
31         unsigned int brownout_threshold;
32         unsigned int brownout_attenuation;
33         unsigned int brownout_attack_hold;
34         unsigned int brownout_timed_hold;
35         unsigned int brownout_release_rate;
36 };
37
38 static struct reg_default max98504_reg_defaults[] = {
39         { 0x01, 0},
40         { 0x02, 0},
41         { 0x03, 0},
42         { 0x04, 0},
43         { 0x10, 0},
44         { 0x11, 0},
45         { 0x12, 0},
46         { 0x13, 0},
47         { 0x14, 0},
48         { 0x15, 0},
49         { 0x16, 0},
50         { 0x17, 0},
51         { 0x18, 0},
52         { 0x19, 0},
53         { 0x1A, 0},
54         { 0x20, 0},
55         { 0x21, 0},
56         { 0x22, 0},
57         { 0x23, 0},
58         { 0x24, 0},
59         { 0x25, 0},
60         { 0x26, 0},
61         { 0x27, 0},
62         { 0x28, 0},
63         { 0x30, 0},
64         { 0x31, 0},
65         { 0x32, 0},
66         { 0x33, 0},
67         { 0x34, 0},
68         { 0x35, 0},
69         { 0x36, 0},
70         { 0x37, 0},
71         { 0x38, 0},
72         { 0x39, 0},
73         { 0x40, 0},
74         { 0x41, 0},
75 };
76
77 static bool max98504_volatile_register(struct device *dev, unsigned int reg)
78 {
79         switch (reg) {
80         case MAX98504_INTERRUPT_STATUS:
81         case MAX98504_INTERRUPT_FLAGS:
82         case MAX98504_INTERRUPT_FLAG_CLEARS:
83         case MAX98504_WATCHDOG_CLEAR:
84         case MAX98504_GLOBAL_ENABLE:
85         case MAX98504_SOFTWARE_RESET:
86                 return true;
87         default:
88                 return false;
89         }
90 }
91
92 static bool max98504_readable_register(struct device *dev, unsigned int reg)
93 {
94         switch (reg) {
95         case MAX98504_SOFTWARE_RESET:
96         case MAX98504_WATCHDOG_CLEAR:
97         case MAX98504_INTERRUPT_FLAG_CLEARS:
98                 return false;
99         default:
100                 return true;
101         }
102 }
103
104 static int max98504_pcm_rx_ev(struct snd_soc_dapm_widget *w,
105                               struct snd_kcontrol *kcontrol, int event)
106 {
107         struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
108         struct max98504_priv *max98504 = snd_soc_component_get_drvdata(c);
109
110         switch (event) {
111         case SND_SOC_DAPM_PRE_PMU:
112                 regmap_write(max98504->regmap, MAX98504_PCM_RX_ENABLE,
113                              max98504->pcm_rx_channels);
114                 break;
115         case SND_SOC_DAPM_POST_PMD:
116                 regmap_write(max98504->regmap, MAX98504_PCM_RX_ENABLE, 0);
117                 break;
118         }
119
120         return 0;
121 }
122
123 static int max98504_component_probe(struct snd_soc_component *c)
124 {
125         struct max98504_priv *max98504 = snd_soc_component_get_drvdata(c);
126         struct regmap *map = max98504->regmap;
127         int ret;
128
129         ret = regulator_bulk_enable(MAX98504_NUM_SUPPLIES, max98504->supplies);
130         if (ret < 0)
131                 return ret;
132
133         regmap_write(map, MAX98504_SOFTWARE_RESET, 0x1);
134         msleep(20);
135
136         if (!max98504->brownout_enable)
137                 return 0;
138
139         regmap_write(map, MAX98504_PVDD_BROWNOUT_ENABLE, 0x1);
140
141         regmap_write(map, MAX98504_PVDD_BROWNOUT_CONFIG_1,
142                      (max98504->brownout_threshold & 0x1f) << 3 |
143                      (max98504->brownout_attenuation & 0x3));
144
145         regmap_write(map, MAX98504_PVDD_BROWNOUT_CONFIG_2,
146                      max98504->brownout_attack_hold & 0xff);
147
148         regmap_write(map, MAX98504_PVDD_BROWNOUT_CONFIG_3,
149                      max98504->brownout_timed_hold & 0xff);
150
151         regmap_write(map, MAX98504_PVDD_BROWNOUT_CONFIG_4,
152                      max98504->brownout_release_rate & 0xff);
153
154         return 0;
155 }
156
157 static void max98504_component_remove(struct snd_soc_component *c)
158 {
159         struct max98504_priv *max98504 = snd_soc_component_get_drvdata(c);
160
161         regulator_bulk_disable(MAX98504_NUM_SUPPLIES, max98504->supplies);
162 }
163
164 static const char *spk_source_mux_text[] = {
165         "PCM Monomix", "Analog In", "PDM Left", "PDM Right"
166 };
167
168 static const struct soc_enum spk_source_mux_enum =
169         SOC_ENUM_SINGLE(MAX98504_SPEAKER_SOURCE_SELECT,
170                         0, ARRAY_SIZE(spk_source_mux_text),
171                         spk_source_mux_text);
172
173 static const struct snd_kcontrol_new spk_source_mux =
174         SOC_DAPM_ENUM("SPK Source", spk_source_mux_enum);
175
176 static const struct snd_soc_dapm_route max98504_dapm_routes[] = {
177         { "SPKOUT", NULL, "Global Enable" },
178         { "SPK Source", "PCM Monomix", "DAC PCM" },
179         { "SPK Source", "Analog In", "AIN" },
180         { "SPK Source", "PDM Left", "DAC PDM" },
181         { "SPK Source", "PDM Right", "DAC PDM" },
182 };
183
184 static const struct snd_soc_dapm_widget max98504_dapm_widgets[] = {
185         SND_SOC_DAPM_SUPPLY("Global Enable", MAX98504_GLOBAL_ENABLE,
186                 0, 0, NULL, 0),
187         SND_SOC_DAPM_INPUT("AIN"),
188         SND_SOC_DAPM_AIF_OUT("AIF2OUTL", "AIF2 Capture", 0, SND_SOC_NOPM, 0, 0),
189         SND_SOC_DAPM_AIF_OUT("AIF2OUTR", "AIF2 Capture", 1, SND_SOC_NOPM, 0, 0),
190         SND_SOC_DAPM_DAC_E("DAC PCM", NULL, SND_SOC_NOPM, 0, 0,
191                 max98504_pcm_rx_ev,
192                 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
193         SND_SOC_DAPM_DAC("DAC PDM", NULL, MAX98504_PDM_RX_ENABLE, 0, 0),
194         SND_SOC_DAPM_MUX("SPK Source", SND_SOC_NOPM, 0, 0, &spk_source_mux),
195         SND_SOC_DAPM_REG(snd_soc_dapm_spk, "SPKOUT",
196                 MAX98504_SPEAKER_ENABLE, 0, 1, 1, 0),
197 };
198
199 static int max98504_set_tdm_slot(struct snd_soc_dai *dai,
200                 unsigned int tx_mask, unsigned int rx_mask,
201                 int slots, int slot_width)
202 {
203         struct max98504_priv *max98504 = snd_soc_dai_get_drvdata(dai);
204         struct regmap *map = max98504->regmap;
205
206
207         switch (dai->id) {
208         case MAX98504_DAI_ID_PCM:
209                 regmap_write(map, MAX98504_PCM_TX_ENABLE, tx_mask);
210                 max98504->pcm_rx_channels = rx_mask;
211                 break;
212
213         case MAX98504_DAI_ID_PDM:
214                 regmap_write(map, MAX98504_PDM_TX_ENABLE, tx_mask);
215                 break;
216         default:
217                 WARN_ON(1);
218         }
219
220         return 0;
221 }
222 static int max98504_set_channel_map(struct snd_soc_dai *dai,
223                                     unsigned int tx_num,
224                                     const unsigned int *tx_slot,
225                                     unsigned int rx_num,
226                                     const unsigned int *rx_slot)
227 {
228         struct max98504_priv *max98504 = snd_soc_dai_get_drvdata(dai);
229         struct regmap *map = max98504->regmap;
230         unsigned int i, sources = 0;
231
232         for (i = 0; i < tx_num; i++)
233                 if (tx_slot[i])
234                         sources |= (1 << i);
235
236         switch (dai->id) {
237         case MAX98504_DAI_ID_PCM:
238                 regmap_write(map, MAX98504_PCM_TX_CHANNEL_SOURCES,
239                              sources);
240                 break;
241
242         case MAX98504_DAI_ID_PDM:
243                 regmap_write(map, MAX98504_PDM_TX_CONTROL, sources);
244                 break;
245         default:
246                 WARN_ON(1);
247         }
248
249         regmap_write(map, MAX98504_MEASUREMENT_ENABLE, sources ? 0x3 : 0x01);
250
251         return 0;
252 }
253
254 static const struct snd_soc_dai_ops max98504_dai_ops = {
255         .set_tdm_slot           = max98504_set_tdm_slot,
256         .set_channel_map        = max98504_set_channel_map,
257 };
258
259 #define MAX98504_FORMATS        (SNDRV_PCM_FMTBIT_S8|SNDRV_PCM_FMTBIT_S16_LE|\
260                                 SNDRV_PCM_FMTBIT_S24_LE|SNDRV_PCM_FMTBIT_S32_LE)
261 #define MAX98504_PDM_RATES      (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_16000|\
262                                 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100|\
263                                 SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_88200|\
264                                 SNDRV_PCM_RATE_96000)
265
266 static struct snd_soc_dai_driver max98504_dai[] = {
267         /* TODO: Add the PCM interface definitions */
268         {
269                 .name = "max98504-aif2",
270                 .id = MAX98504_DAI_ID_PDM,
271                 .playback = {
272                         .stream_name    = "AIF2 Playback",
273                         .channels_min   = 1,
274                         .channels_max   = 2,
275                         .rates          = MAX98504_PDM_RATES,
276                         .formats        = MAX98504_FORMATS,
277                 },
278                 .capture = {
279                         .stream_name    = "AIF2 Capture",
280                         .channels_min   = 1,
281                         .channels_max   = 2,
282                         .rates          = MAX98504_PDM_RATES,
283                         .formats        = MAX98504_FORMATS,
284                 },
285                 .ops = &max98504_dai_ops,
286         },
287 };
288
289 static const struct snd_soc_component_driver max98504_component_driver = {
290         .probe                  = max98504_component_probe,
291         .remove                 = max98504_component_remove,
292         .dapm_widgets           = max98504_dapm_widgets,
293         .num_dapm_widgets       = ARRAY_SIZE(max98504_dapm_widgets),
294         .dapm_routes            = max98504_dapm_routes,
295         .num_dapm_routes        = ARRAY_SIZE(max98504_dapm_routes),
296         .endianness             = 1,
297 };
298
299 static const struct regmap_config max98504_regmap = {
300         .reg_bits               = 16,
301         .val_bits               = 8,
302         .max_register           = MAX98504_MAX_REGISTER,
303         .reg_defaults           = max98504_reg_defaults,
304         .num_reg_defaults       = ARRAY_SIZE(max98504_reg_defaults),
305         .volatile_reg           = max98504_volatile_register,
306         .readable_reg           = max98504_readable_register,
307         .cache_type             = REGCACHE_RBTREE,
308 };
309
310 static int max98504_i2c_probe(struct i2c_client *client)
311 {
312         struct device *dev = &client->dev;
313         struct device_node *node = dev->of_node;
314         struct max98504_priv *max98504;
315         int i, ret;
316
317         max98504 = devm_kzalloc(dev, sizeof(*max98504), GFP_KERNEL);
318         if (!max98504)
319                 return -ENOMEM;
320
321         if (node) {
322                 if (!of_property_read_u32(node, "maxim,brownout-threshold",
323                                         &max98504->brownout_threshold))
324                         max98504->brownout_enable = true;
325
326                 of_property_read_u32(node, "maxim,brownout-attenuation",
327                                         &max98504->brownout_attenuation);
328                 of_property_read_u32(node, "maxim,brownout-attack-hold-ms",
329                                         &max98504->brownout_attack_hold);
330                 of_property_read_u32(node, "maxim,brownout-timed-hold-ms",
331                                         &max98504->brownout_timed_hold);
332                 of_property_read_u32(node, "maxim,brownout-release-rate-ms",
333                                         &max98504->brownout_release_rate);
334         }
335
336         max98504->regmap = devm_regmap_init_i2c(client, &max98504_regmap);
337         if (IS_ERR(max98504->regmap)) {
338                 ret = PTR_ERR(max98504->regmap);
339                 dev_err(&client->dev, "regmap initialization failed: %d\n", ret);
340                 return ret;
341         }
342
343         for (i = 0; i < MAX98504_NUM_SUPPLIES; i++)
344                 max98504->supplies[i].supply = max98504_supply_names[i];
345
346         ret = devm_regulator_bulk_get(dev, MAX98504_NUM_SUPPLIES,
347                                       max98504->supplies);
348         if (ret < 0)
349                 return ret;
350
351         i2c_set_clientdata(client, max98504);
352
353         return devm_snd_soc_register_component(dev, &max98504_component_driver,
354                                 max98504_dai, ARRAY_SIZE(max98504_dai));
355 }
356
357 #ifdef CONFIG_OF
358 static const struct of_device_id max98504_of_match[] = {
359         { .compatible = "maxim,max98504" },
360         { },
361 };
362 MODULE_DEVICE_TABLE(of, max98504_of_match);
363 #endif
364
365 static const struct i2c_device_id max98504_i2c_id[] = {
366         { "max98504" },
367         { }
368 };
369 MODULE_DEVICE_TABLE(i2c, max98504_i2c_id);
370
371 static struct i2c_driver max98504_i2c_driver = {
372         .driver = {
373                 .name = "max98504",
374                 .of_match_table = of_match_ptr(max98504_of_match),
375         },
376         .probe = max98504_i2c_probe,
377         .id_table = max98504_i2c_id,
378 };
379 module_i2c_driver(max98504_i2c_driver);
380
381 MODULE_DESCRIPTION("ASoC MAX98504 driver");
382 MODULE_LICENSE("GPL");
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