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71cfc902 MB |
1 | /* |
2 | * wm8728.c -- WM8728 ALSA SoC Audio driver | |
3 | * | |
4 | * Copyright 2008 Wolfson Microelectronics plc | |
5 | * | |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/pm.h> | |
18 | #include <linux/i2c.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/spi/spi.h> | |
21 | #include <sound/core.h> | |
22 | #include <sound/pcm.h> | |
23 | #include <sound/pcm_params.h> | |
24 | #include <sound/soc.h> | |
25 | #include <sound/soc-dapm.h> | |
26 | #include <sound/initval.h> | |
27 | #include <sound/tlv.h> | |
28 | ||
29 | #include "wm8728.h" | |
30 | ||
31 | struct snd_soc_codec_device soc_codec_dev_wm8728; | |
32 | ||
33 | /* | |
34 | * We can't read the WM8728 register space so we cache them instead. | |
35 | * Note that the defaults here aren't the physical defaults, we latch | |
36 | * the volume update bits, mute the output and enable infinite zero | |
37 | * detect. | |
38 | */ | |
39 | static const u16 wm8728_reg_defaults[] = { | |
40 | 0x1ff, | |
41 | 0x1ff, | |
42 | 0x001, | |
43 | 0x100, | |
44 | }; | |
45 | ||
46 | static inline unsigned int wm8728_read_reg_cache(struct snd_soc_codec *codec, | |
47 | unsigned int reg) | |
48 | { | |
49 | u16 *cache = codec->reg_cache; | |
91432e97 | 50 | BUG_ON(reg >= ARRAY_SIZE(wm8728_reg_defaults)); |
71cfc902 MB |
51 | return cache[reg]; |
52 | } | |
53 | ||
54 | static inline void wm8728_write_reg_cache(struct snd_soc_codec *codec, | |
55 | u16 reg, unsigned int value) | |
56 | { | |
57 | u16 *cache = codec->reg_cache; | |
91432e97 | 58 | BUG_ON(reg >= ARRAY_SIZE(wm8728_reg_defaults)); |
71cfc902 MB |
59 | cache[reg] = value; |
60 | } | |
61 | ||
62 | /* | |
63 | * write to the WM8728 register space | |
64 | */ | |
65 | static int wm8728_write(struct snd_soc_codec *codec, unsigned int reg, | |
66 | unsigned int value) | |
67 | { | |
68 | u8 data[2]; | |
69 | ||
70 | /* data is | |
71 | * D15..D9 WM8728 register offset | |
72 | * D8...D0 register data | |
73 | */ | |
74 | data[0] = (reg << 1) | ((value >> 8) & 0x0001); | |
75 | data[1] = value & 0x00ff; | |
76 | ||
77 | wm8728_write_reg_cache(codec, reg, value); | |
78 | ||
79 | if (codec->hw_write(codec->control_data, data, 2) == 2) | |
80 | return 0; | |
81 | else | |
82 | return -EIO; | |
83 | } | |
84 | ||
85 | static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1); | |
86 | ||
87 | static const struct snd_kcontrol_new wm8728_snd_controls[] = { | |
88 | ||
89 | SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL, | |
90 | 0, 255, 0, wm8728_tlv), | |
91 | ||
92 | SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0), | |
93 | }; | |
94 | ||
71cfc902 MB |
95 | /* |
96 | * DAPM controls. | |
97 | */ | |
98 | static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = { | |
99 | SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0), | |
100 | SND_SOC_DAPM_OUTPUT("VOUTL"), | |
101 | SND_SOC_DAPM_OUTPUT("VOUTR"), | |
102 | }; | |
103 | ||
104 | static const struct snd_soc_dapm_route intercon[] = { | |
105 | {"VOUTL", NULL, "DAC"}, | |
106 | {"VOUTR", NULL, "DAC"}, | |
107 | }; | |
108 | ||
109 | static int wm8728_add_widgets(struct snd_soc_codec *codec) | |
110 | { | |
111 | snd_soc_dapm_new_controls(codec, wm8728_dapm_widgets, | |
112 | ARRAY_SIZE(wm8728_dapm_widgets)); | |
113 | ||
114 | snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon)); | |
115 | ||
116 | snd_soc_dapm_new_widgets(codec); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static int wm8728_mute(struct snd_soc_dai *dai, int mute) | |
122 | { | |
123 | struct snd_soc_codec *codec = dai->codec; | |
124 | u16 mute_reg = wm8728_read_reg_cache(codec, WM8728_DACCTL); | |
125 | ||
126 | if (mute) | |
127 | wm8728_write(codec, WM8728_DACCTL, mute_reg | 1); | |
128 | else | |
129 | wm8728_write(codec, WM8728_DACCTL, mute_reg & ~1); | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
134 | static int wm8728_hw_params(struct snd_pcm_substream *substream, | |
dee89c4d MB |
135 | struct snd_pcm_hw_params *params, |
136 | struct snd_soc_dai *dai) | |
71cfc902 MB |
137 | { |
138 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
139 | struct snd_soc_device *socdev = rtd->socdev; | |
6627a653 | 140 | struct snd_soc_codec *codec = socdev->card->codec; |
71cfc902 MB |
141 | u16 dac = wm8728_read_reg_cache(codec, WM8728_DACCTL); |
142 | ||
143 | dac &= ~0x18; | |
144 | ||
145 | switch (params_format(params)) { | |
146 | case SNDRV_PCM_FORMAT_S16_LE: | |
147 | break; | |
148 | case SNDRV_PCM_FORMAT_S20_3LE: | |
149 | dac |= 0x10; | |
150 | break; | |
151 | case SNDRV_PCM_FORMAT_S24_LE: | |
152 | dac |= 0x08; | |
153 | break; | |
154 | default: | |
155 | return -EINVAL; | |
156 | } | |
157 | ||
158 | wm8728_write(codec, WM8728_DACCTL, dac); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai, | |
164 | unsigned int fmt) | |
165 | { | |
166 | struct snd_soc_codec *codec = codec_dai->codec; | |
167 | u16 iface = wm8728_read_reg_cache(codec, WM8728_IFCTL); | |
168 | ||
169 | /* Currently only I2S is supported by the driver, though the | |
170 | * hardware is more flexible. | |
171 | */ | |
172 | switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { | |
173 | case SND_SOC_DAIFMT_I2S: | |
174 | iface |= 1; | |
175 | break; | |
176 | default: | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
180 | /* The hardware only support full slave mode */ | |
181 | switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { | |
182 | case SND_SOC_DAIFMT_CBS_CFS: | |
183 | break; | |
184 | default: | |
185 | return -EINVAL; | |
186 | } | |
187 | ||
188 | switch (fmt & SND_SOC_DAIFMT_INV_MASK) { | |
189 | case SND_SOC_DAIFMT_NB_NF: | |
190 | iface &= ~0x22; | |
191 | break; | |
192 | case SND_SOC_DAIFMT_IB_NF: | |
193 | iface |= 0x20; | |
194 | iface &= ~0x02; | |
195 | break; | |
196 | case SND_SOC_DAIFMT_NB_IF: | |
197 | iface |= 0x02; | |
198 | iface &= ~0x20; | |
199 | break; | |
200 | case SND_SOC_DAIFMT_IB_IF: | |
201 | iface |= 0x22; | |
202 | break; | |
203 | default: | |
204 | return -EINVAL; | |
205 | } | |
206 | ||
207 | wm8728_write(codec, WM8728_IFCTL, iface); | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static int wm8728_set_bias_level(struct snd_soc_codec *codec, | |
212 | enum snd_soc_bias_level level) | |
213 | { | |
214 | u16 reg; | |
215 | int i; | |
216 | ||
217 | switch (level) { | |
218 | case SND_SOC_BIAS_ON: | |
219 | case SND_SOC_BIAS_PREPARE: | |
220 | case SND_SOC_BIAS_STANDBY: | |
221 | if (codec->bias_level == SND_SOC_BIAS_OFF) { | |
222 | /* Power everything up... */ | |
223 | reg = wm8728_read_reg_cache(codec, WM8728_DACCTL); | |
224 | wm8728_write(codec, WM8728_DACCTL, reg & ~0x4); | |
225 | ||
226 | /* ..then sync in the register cache. */ | |
227 | for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++) | |
228 | wm8728_write(codec, i, | |
229 | wm8728_read_reg_cache(codec, i)); | |
230 | } | |
231 | break; | |
232 | ||
233 | case SND_SOC_BIAS_OFF: | |
234 | reg = wm8728_read_reg_cache(codec, WM8728_DACCTL); | |
235 | wm8728_write(codec, WM8728_DACCTL, reg | 0x4); | |
236 | break; | |
237 | } | |
238 | codec->bias_level = level; | |
239 | return 0; | |
240 | } | |
241 | ||
242 | #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000) | |
243 | ||
244 | #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ | |
245 | SNDRV_PCM_FMTBIT_S24_LE) | |
246 | ||
247 | struct snd_soc_dai wm8728_dai = { | |
248 | .name = "WM8728", | |
249 | .playback = { | |
250 | .stream_name = "Playback", | |
251 | .channels_min = 2, | |
252 | .channels_max = 2, | |
253 | .rates = WM8728_RATES, | |
254 | .formats = WM8728_FORMATS, | |
255 | }, | |
256 | .ops = { | |
257 | .hw_params = wm8728_hw_params, | |
71cfc902 MB |
258 | .digital_mute = wm8728_mute, |
259 | .set_fmt = wm8728_set_dai_fmt, | |
260 | } | |
261 | }; | |
262 | EXPORT_SYMBOL_GPL(wm8728_dai); | |
263 | ||
264 | static int wm8728_suspend(struct platform_device *pdev, pm_message_t state) | |
265 | { | |
266 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
6627a653 | 267 | struct snd_soc_codec *codec = socdev->card->codec; |
71cfc902 MB |
268 | |
269 | wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | static int wm8728_resume(struct platform_device *pdev) | |
275 | { | |
276 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
6627a653 | 277 | struct snd_soc_codec *codec = socdev->card->codec; |
71cfc902 MB |
278 | |
279 | wm8728_set_bias_level(codec, codec->suspend_bias_level); | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | /* | |
285 | * initialise the WM8728 driver | |
286 | * register the mixer and dsp interfaces with the kernel | |
287 | */ | |
288 | static int wm8728_init(struct snd_soc_device *socdev) | |
289 | { | |
6627a653 | 290 | struct snd_soc_codec *codec = socdev->card->codec; |
71cfc902 MB |
291 | int ret = 0; |
292 | ||
293 | codec->name = "WM8728"; | |
294 | codec->owner = THIS_MODULE; | |
295 | codec->read = wm8728_read_reg_cache; | |
296 | codec->write = wm8728_write; | |
297 | codec->set_bias_level = wm8728_set_bias_level; | |
298 | codec->dai = &wm8728_dai; | |
299 | codec->num_dai = 1; | |
300 | codec->bias_level = SND_SOC_BIAS_OFF; | |
301 | codec->reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults); | |
302 | codec->reg_cache = kmemdup(wm8728_reg_defaults, | |
303 | sizeof(wm8728_reg_defaults), | |
304 | GFP_KERNEL); | |
305 | if (codec->reg_cache == NULL) | |
306 | return -ENOMEM; | |
307 | ||
308 | /* register pcms */ | |
309 | ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); | |
310 | if (ret < 0) { | |
311 | printk(KERN_ERR "wm8728: failed to create pcms\n"); | |
312 | goto pcm_err; | |
313 | } | |
314 | ||
315 | /* power on device */ | |
316 | wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY); | |
317 | ||
3e8e1952 IM |
318 | snd_soc_add_controls(codec, wm8728_snd_controls, |
319 | ARRAY_SIZE(wm8728_snd_controls)); | |
71cfc902 | 320 | wm8728_add_widgets(codec); |
968a6025 | 321 | ret = snd_soc_init_card(socdev); |
71cfc902 MB |
322 | if (ret < 0) { |
323 | printk(KERN_ERR "wm8728: failed to register card\n"); | |
324 | goto card_err; | |
325 | } | |
326 | ||
327 | return ret; | |
328 | ||
329 | card_err: | |
330 | snd_soc_free_pcms(socdev); | |
331 | snd_soc_dapm_free(socdev); | |
332 | pcm_err: | |
333 | kfree(codec->reg_cache); | |
334 | return ret; | |
335 | } | |
336 | ||
337 | static struct snd_soc_device *wm8728_socdev; | |
338 | ||
339 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) | |
340 | ||
341 | /* | |
342 | * WM8728 2 wire address is determined by GPIO5 | |
343 | * state during powerup. | |
344 | * low = 0x1a | |
345 | * high = 0x1b | |
346 | */ | |
347 | ||
348 | static int wm8728_i2c_probe(struct i2c_client *i2c, | |
349 | const struct i2c_device_id *id) | |
350 | { | |
351 | struct snd_soc_device *socdev = wm8728_socdev; | |
6627a653 | 352 | struct snd_soc_codec *codec = socdev->card->codec; |
71cfc902 MB |
353 | int ret; |
354 | ||
355 | i2c_set_clientdata(i2c, codec); | |
356 | codec->control_data = i2c; | |
357 | ||
358 | ret = wm8728_init(socdev); | |
359 | if (ret < 0) | |
360 | pr_err("failed to initialise WM8728\n"); | |
361 | ||
362 | return ret; | |
363 | } | |
364 | ||
365 | static int wm8728_i2c_remove(struct i2c_client *client) | |
366 | { | |
367 | struct snd_soc_codec *codec = i2c_get_clientdata(client); | |
368 | kfree(codec->reg_cache); | |
369 | return 0; | |
370 | } | |
371 | ||
372 | static const struct i2c_device_id wm8728_i2c_id[] = { | |
373 | { "wm8728", 0 }, | |
374 | { } | |
375 | }; | |
376 | MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id); | |
377 | ||
378 | static struct i2c_driver wm8728_i2c_driver = { | |
379 | .driver = { | |
380 | .name = "WM8728 I2C Codec", | |
381 | .owner = THIS_MODULE, | |
382 | }, | |
383 | .probe = wm8728_i2c_probe, | |
384 | .remove = wm8728_i2c_remove, | |
385 | .id_table = wm8728_i2c_id, | |
386 | }; | |
387 | ||
388 | static int wm8728_add_i2c_device(struct platform_device *pdev, | |
389 | const struct wm8728_setup_data *setup) | |
390 | { | |
391 | struct i2c_board_info info; | |
392 | struct i2c_adapter *adapter; | |
393 | struct i2c_client *client; | |
394 | int ret; | |
395 | ||
396 | ret = i2c_add_driver(&wm8728_i2c_driver); | |
397 | if (ret != 0) { | |
398 | dev_err(&pdev->dev, "can't add i2c driver\n"); | |
399 | return ret; | |
400 | } | |
401 | ||
402 | memset(&info, 0, sizeof(struct i2c_board_info)); | |
403 | info.addr = setup->i2c_address; | |
404 | strlcpy(info.type, "wm8728", I2C_NAME_SIZE); | |
405 | ||
406 | adapter = i2c_get_adapter(setup->i2c_bus); | |
407 | if (!adapter) { | |
408 | dev_err(&pdev->dev, "can't get i2c adapter %d\n", | |
409 | setup->i2c_bus); | |
410 | goto err_driver; | |
411 | } | |
412 | ||
413 | client = i2c_new_device(adapter, &info); | |
414 | i2c_put_adapter(adapter); | |
415 | if (!client) { | |
416 | dev_err(&pdev->dev, "can't add i2c device at 0x%x\n", | |
417 | (unsigned int)info.addr); | |
418 | goto err_driver; | |
419 | } | |
420 | ||
421 | return 0; | |
422 | ||
423 | err_driver: | |
424 | i2c_del_driver(&wm8728_i2c_driver); | |
425 | return -ENODEV; | |
426 | } | |
427 | #endif | |
428 | ||
429 | #if defined(CONFIG_SPI_MASTER) | |
430 | static int __devinit wm8728_spi_probe(struct spi_device *spi) | |
431 | { | |
432 | struct snd_soc_device *socdev = wm8728_socdev; | |
6627a653 | 433 | struct snd_soc_codec *codec = socdev->card->codec; |
71cfc902 MB |
434 | int ret; |
435 | ||
436 | codec->control_data = spi; | |
437 | ||
438 | ret = wm8728_init(socdev); | |
439 | if (ret < 0) | |
440 | dev_err(&spi->dev, "failed to initialise WM8728\n"); | |
441 | ||
442 | return ret; | |
443 | } | |
444 | ||
445 | static int __devexit wm8728_spi_remove(struct spi_device *spi) | |
446 | { | |
447 | return 0; | |
448 | } | |
449 | ||
450 | static struct spi_driver wm8728_spi_driver = { | |
451 | .driver = { | |
452 | .name = "wm8728", | |
453 | .bus = &spi_bus_type, | |
454 | .owner = THIS_MODULE, | |
455 | }, | |
456 | .probe = wm8728_spi_probe, | |
457 | .remove = __devexit_p(wm8728_spi_remove), | |
458 | }; | |
459 | ||
460 | static int wm8728_spi_write(struct spi_device *spi, const char *data, int len) | |
461 | { | |
462 | struct spi_transfer t; | |
463 | struct spi_message m; | |
464 | u8 msg[2]; | |
465 | ||
466 | if (len <= 0) | |
467 | return 0; | |
468 | ||
469 | msg[0] = data[0]; | |
470 | msg[1] = data[1]; | |
471 | ||
472 | spi_message_init(&m); | |
473 | memset(&t, 0, (sizeof t)); | |
474 | ||
475 | t.tx_buf = &msg[0]; | |
476 | t.len = len; | |
477 | ||
478 | spi_message_add_tail(&t, &m); | |
479 | spi_sync(spi, &m); | |
480 | ||
481 | return len; | |
482 | } | |
483 | #endif /* CONFIG_SPI_MASTER */ | |
484 | ||
485 | static int wm8728_probe(struct platform_device *pdev) | |
486 | { | |
487 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
488 | struct wm8728_setup_data *setup; | |
489 | struct snd_soc_codec *codec; | |
490 | int ret = 0; | |
491 | ||
492 | setup = socdev->codec_data; | |
493 | codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); | |
494 | if (codec == NULL) | |
495 | return -ENOMEM; | |
496 | ||
6627a653 | 497 | socdev->card->codec = codec; |
71cfc902 MB |
498 | mutex_init(&codec->mutex); |
499 | INIT_LIST_HEAD(&codec->dapm_widgets); | |
500 | INIT_LIST_HEAD(&codec->dapm_paths); | |
501 | ||
502 | wm8728_socdev = socdev; | |
503 | ret = -ENODEV; | |
504 | ||
505 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) | |
506 | if (setup->i2c_address) { | |
507 | codec->hw_write = (hw_write_t)i2c_master_send; | |
508 | ret = wm8728_add_i2c_device(pdev, setup); | |
509 | } | |
510 | #endif | |
511 | #if defined(CONFIG_SPI_MASTER) | |
512 | if (setup->spi) { | |
513 | codec->hw_write = (hw_write_t)wm8728_spi_write; | |
514 | ret = spi_register_driver(&wm8728_spi_driver); | |
515 | if (ret != 0) | |
516 | printk(KERN_ERR "can't add spi driver"); | |
517 | } | |
518 | #endif | |
519 | ||
520 | if (ret != 0) | |
521 | kfree(codec); | |
522 | ||
523 | return ret; | |
524 | } | |
525 | ||
526 | /* power down chip */ | |
527 | static int wm8728_remove(struct platform_device *pdev) | |
528 | { | |
529 | struct snd_soc_device *socdev = platform_get_drvdata(pdev); | |
6627a653 | 530 | struct snd_soc_codec *codec = socdev->card->codec; |
71cfc902 MB |
531 | |
532 | if (codec->control_data) | |
533 | wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF); | |
534 | ||
535 | snd_soc_free_pcms(socdev); | |
536 | snd_soc_dapm_free(socdev); | |
537 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) | |
538 | i2c_unregister_device(codec->control_data); | |
539 | i2c_del_driver(&wm8728_i2c_driver); | |
540 | #endif | |
541 | #if defined(CONFIG_SPI_MASTER) | |
542 | spi_unregister_driver(&wm8728_spi_driver); | |
543 | #endif | |
544 | kfree(codec); | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | struct snd_soc_codec_device soc_codec_dev_wm8728 = { | |
550 | .probe = wm8728_probe, | |
551 | .remove = wm8728_remove, | |
552 | .suspend = wm8728_suspend, | |
553 | .resume = wm8728_resume, | |
554 | }; | |
555 | EXPORT_SYMBOL_GPL(soc_codec_dev_wm8728); | |
556 | ||
c9b3a40f | 557 | static int __init wm8728_modinit(void) |
64089b84 MB |
558 | { |
559 | return snd_soc_register_dai(&wm8728_dai); | |
560 | } | |
561 | module_init(wm8728_modinit); | |
562 | ||
563 | static void __exit wm8728_exit(void) | |
564 | { | |
565 | snd_soc_unregister_dai(&wm8728_dai); | |
566 | } | |
567 | module_exit(wm8728_exit); | |
568 | ||
71cfc902 MB |
569 | MODULE_DESCRIPTION("ASoC WM8728 driver"); |
570 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
571 | MODULE_LICENSE("GPL"); |