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WIP FPC-III support
[linux/fpc-iii.git] / sound / soc / codecs / tas6424.c
blob59543d392110a0201cbf3379f5bac123d1e046ad
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ALSA SoC Texas Instruments TAS6424 Quad-Channel Audio Amplifier
4 *
5 * Copyright (C) 2016-2017 Texas Instruments Incorporated - https://www.ti.com/
6 * Author: Andreas Dannenberg <dannenberg@ti.com>
7 * Andrew F. Davis <afd@ti.com>
8 */
9
10 #include <linux/module.h>
11 #include <linux/errno.h>
12 #include <linux/device.h>
13 #include <linux/i2c.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/regmap.h>
16 #include <linux/slab.h>
17 #include <linux/regulator/consumer.h>
18 #include <linux/delay.h>
19 #include <linux/gpio/consumer.h>
20
21 #include <sound/pcm.h>
22 #include <sound/pcm_params.h>
23 #include <sound/soc.h>
24 #include <sound/soc-dapm.h>
25 #include <sound/tlv.h>
26
27 #include "tas6424.h"
28
29 /* Define how often to check (and clear) the fault status register (in ms) */
30 #define TAS6424_FAULT_CHECK_INTERVAL 200
31
32 static const char * const tas6424_supply_names[] = {
33 "dvdd", /* Digital power supply. Connect to 3.3-V supply. */
34 "vbat", /* Supply used for higher voltage analog circuits. */
35 "pvdd", /* Class-D amp output FETs supply. */
36 };
37 #define TAS6424_NUM_SUPPLIES ARRAY_SIZE(tas6424_supply_names)
38
39 struct tas6424_data {
40 struct device *dev;
41 struct regmap *regmap;
42 struct regulator_bulk_data supplies[TAS6424_NUM_SUPPLIES];
43 struct delayed_work fault_check_work;
44 unsigned int last_cfault;
45 unsigned int last_fault1;
46 unsigned int last_fault2;
47 unsigned int last_warn;
48 struct gpio_desc *standby_gpio;
49 struct gpio_desc *mute_gpio;
50 };
51
52 /*
53 * DAC digital volumes. From -103.5 to 24 dB in 0.5 dB steps. Note that
54 * setting the gain below -100 dB (register value <0x7) is effectively a MUTE
55 * as per device datasheet.
56 */
57 static DECLARE_TLV_DB_SCALE(dac_tlv, -10350, 50, 0);
58
59 static const struct snd_kcontrol_new tas6424_snd_controls[] = {
60 SOC_SINGLE_TLV("Speaker Driver CH1 Playback Volume",
61 TAS6424_CH1_VOL_CTRL, 0, 0xff, 0, dac_tlv),
62 SOC_SINGLE_TLV("Speaker Driver CH2 Playback Volume",
63 TAS6424_CH2_VOL_CTRL, 0, 0xff, 0, dac_tlv),
64 SOC_SINGLE_TLV("Speaker Driver CH3 Playback Volume",
65 TAS6424_CH3_VOL_CTRL, 0, 0xff, 0, dac_tlv),
66 SOC_SINGLE_TLV("Speaker Driver CH4 Playback Volume",
67 TAS6424_CH4_VOL_CTRL, 0, 0xff, 0, dac_tlv),
68 SOC_SINGLE_STROBE("Auto Diagnostics Switch", TAS6424_DC_DIAG_CTRL1,
69 TAS6424_LDGBYPASS_SHIFT, 1),
70 };
71
72 static int tas6424_dac_event(struct snd_soc_dapm_widget *w,
73 struct snd_kcontrol *kcontrol, int event)
74 {
75 struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
76 struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
77
78 dev_dbg(component->dev, "%s() event=0x%0x\n", __func__, event);
79
80 if (event & SND_SOC_DAPM_POST_PMU) {
81 /* Observe codec shutdown-to-active time */
82 msleep(12);
83
84 /* Turn on TAS6424 periodic fault checking/handling */
85 tas6424->last_fault1 = 0;
86 tas6424->last_fault2 = 0;
87 tas6424->last_warn = 0;
88 schedule_delayed_work(&tas6424->fault_check_work,
89 msecs_to_jiffies(TAS6424_FAULT_CHECK_INTERVAL));
90 } else if (event & SND_SOC_DAPM_PRE_PMD) {
91 /* Disable TAS6424 periodic fault checking/handling */
92 cancel_delayed_work_sync(&tas6424->fault_check_work);
93 }
94
95 return 0;
96 }
97
98 static const struct snd_soc_dapm_widget tas6424_dapm_widgets[] = {
99 SND_SOC_DAPM_AIF_IN("DAC IN", "Playback", 0, SND_SOC_NOPM, 0, 0),
100 SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, tas6424_dac_event,
101 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
102 SND_SOC_DAPM_OUTPUT("OUT")
103 };
104
105 static const struct snd_soc_dapm_route tas6424_audio_map[] = {
106 { "DAC", NULL, "DAC IN" },
107 { "OUT", NULL, "DAC" },
108 };
109
110 static int tas6424_hw_params(struct snd_pcm_substream *substream,
111 struct snd_pcm_hw_params *params,
112 struct snd_soc_dai *dai)
113 {
114 struct snd_soc_component *component = dai->component;
115 unsigned int rate = params_rate(params);
116 unsigned int width = params_width(params);
117 u8 sap_ctrl = 0;
118
119 dev_dbg(component->dev, "%s() rate=%u width=%u\n", __func__, rate, width);
120
121 switch (rate) {
122 case 44100:
123 sap_ctrl |= TAS6424_SAP_RATE_44100;
124 break;
125 case 48000:
126 sap_ctrl |= TAS6424_SAP_RATE_48000;
127 break;
128 case 96000:
129 sap_ctrl |= TAS6424_SAP_RATE_96000;
130 break;
131 default:
132 dev_err(component->dev, "unsupported sample rate: %u\n", rate);
133 return -EINVAL;
134 }
135
136 switch (width) {
137 case 16:
138 sap_ctrl |= TAS6424_SAP_TDM_SLOT_SZ_16;
139 break;
140 case 24:
141 break;
142 default:
143 dev_err(component->dev, "unsupported sample width: %u\n", width);
144 return -EINVAL;
145 }
146
147 snd_soc_component_update_bits(component, TAS6424_SAP_CTRL,
148 TAS6424_SAP_RATE_MASK |
149 TAS6424_SAP_TDM_SLOT_SZ_16,
150 sap_ctrl);
151
152 return 0;
153 }
154
155 static int tas6424_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
156 {
157 struct snd_soc_component *component = dai->component;
158 u8 serial_format = 0;
159
160 dev_dbg(component->dev, "%s() fmt=0x%0x\n", __func__, fmt);
161
162 /* clock masters */
163 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
164 case SND_SOC_DAIFMT_CBS_CFS:
165 break;
166 default:
167 dev_err(component->dev, "Invalid DAI master/slave interface\n");
168 return -EINVAL;
169 }
170
171 /* signal polarity */
172 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
173 case SND_SOC_DAIFMT_NB_NF:
174 break;
175 default:
176 dev_err(component->dev, "Invalid DAI clock signal polarity\n");
177 return -EINVAL;
178 }
179
180 /* interface format */
181 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
182 case SND_SOC_DAIFMT_I2S:
183 serial_format |= TAS6424_SAP_I2S;
184 break;
185 case SND_SOC_DAIFMT_DSP_A:
186 serial_format |= TAS6424_SAP_DSP;
187 break;
188 case SND_SOC_DAIFMT_DSP_B:
189 /*
190 * We can use the fact that the TAS6424 does not care about the
191 * LRCLK duty cycle during TDM to receive DSP_B formatted data
192 * in LEFTJ mode (no delaying of the 1st data bit).
193 */
194 serial_format |= TAS6424_SAP_LEFTJ;
195 break;
196 case SND_SOC_DAIFMT_LEFT_J:
197 serial_format |= TAS6424_SAP_LEFTJ;
198 break;
199 default:
200 dev_err(component->dev, "Invalid DAI interface format\n");
201 return -EINVAL;
202 }
203
204 snd_soc_component_update_bits(component, TAS6424_SAP_CTRL,
205 TAS6424_SAP_FMT_MASK, serial_format);
206
207 return 0;
208 }
209
210 static int tas6424_set_dai_tdm_slot(struct snd_soc_dai *dai,
211 unsigned int tx_mask, unsigned int rx_mask,
212 int slots, int slot_width)
213 {
214 struct snd_soc_component *component = dai->component;
215 unsigned int first_slot, last_slot;
216 bool sap_tdm_slot_last;
217
218 dev_dbg(component->dev, "%s() tx_mask=%d rx_mask=%d\n", __func__,
219 tx_mask, rx_mask);
220
221 if (!tx_mask || !rx_mask)
222 return 0; /* nothing needed to disable TDM mode */
223
224 /*
225 * Determine the first slot and last slot that is being requested so
226 * we'll be able to more easily enforce certain constraints as the
227 * TAS6424's TDM interface is not fully configurable.
228 */
229 first_slot = __ffs(tx_mask);
230 last_slot = __fls(rx_mask);
231
232 if (last_slot - first_slot != 4) {
233 dev_err(component->dev, "tdm mask must cover 4 contiguous slots\n");
234 return -EINVAL;
235 }
236
237 switch (first_slot) {
238 case 0:
239 sap_tdm_slot_last = false;
240 break;
241 case 4:
242 sap_tdm_slot_last = true;
243 break;
244 default:
245 dev_err(component->dev, "tdm mask must start at slot 0 or 4\n");
246 return -EINVAL;
247 }
248
249 snd_soc_component_update_bits(component, TAS6424_SAP_CTRL, TAS6424_SAP_TDM_SLOT_LAST,
250 sap_tdm_slot_last ? TAS6424_SAP_TDM_SLOT_LAST : 0);
251
252 return 0;
253 }
254
255 static int tas6424_mute(struct snd_soc_dai *dai, int mute, int direction)
256 {
257 struct snd_soc_component *component = dai->component;
258 struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
259 unsigned int val;
260
261 dev_dbg(component->dev, "%s() mute=%d\n", __func__, mute);
262
263 if (tas6424->mute_gpio) {
264 gpiod_set_value_cansleep(tas6424->mute_gpio, mute);
265 return 0;
266 }
267
268 if (mute)
269 val = TAS6424_ALL_STATE_MUTE;
270 else
271 val = TAS6424_ALL_STATE_PLAY;
272
273 snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, val);
274
275 return 0;
276 }
277
278 static int tas6424_power_off(struct snd_soc_component *component)
279 {
280 struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
281 int ret;
282
283 snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, TAS6424_ALL_STATE_HIZ);
284
285 regcache_cache_only(tas6424->regmap, true);
286 regcache_mark_dirty(tas6424->regmap);
287
288 ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),
289 tas6424->supplies);
290 if (ret < 0) {
291 dev_err(component->dev, "failed to disable supplies: %d\n", ret);
292 return ret;
293 }
294
295 return 0;
296 }
297
298 static int tas6424_power_on(struct snd_soc_component *component)
299 {
300 struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
301 int ret;
302 u8 chan_states;
303 int no_auto_diags = 0;
304 unsigned int reg_val;
305
306 if (!regmap_read(tas6424->regmap, TAS6424_DC_DIAG_CTRL1, &reg_val))
307 no_auto_diags = reg_val & TAS6424_LDGBYPASS_MASK;
308
309 ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),
310 tas6424->supplies);
311 if (ret < 0) {
312 dev_err(component->dev, "failed to enable supplies: %d\n", ret);
313 return ret;
314 }
315
316 regcache_cache_only(tas6424->regmap, false);
317
318 ret = regcache_sync(tas6424->regmap);
319 if (ret < 0) {
320 dev_err(component->dev, "failed to sync regcache: %d\n", ret);
321 return ret;
322 }
323
324 if (tas6424->mute_gpio) {
325 gpiod_set_value_cansleep(tas6424->mute_gpio, 0);
326 /*
327 * channels are muted via the mute pin. Don't also mute
328 * them via the registers so that subsequent register
329 * access is not necessary to un-mute the channels
330 */
331 chan_states = TAS6424_ALL_STATE_PLAY;
332 } else {
333 chan_states = TAS6424_ALL_STATE_MUTE;
334 }
335 snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, chan_states);
336
337 /* any time we come out of HIZ, the output channels automatically run DC
338 * load diagnostics if autodiagnotics are enabled. wait here until this
339 * completes.
340 */
341 if (!no_auto_diags)
342 msleep(230);
343
344 return 0;
345 }
346
347 static int tas6424_set_bias_level(struct snd_soc_component *component,
348 enum snd_soc_bias_level level)
349 {
350 dev_dbg(component->dev, "%s() level=%d\n", __func__, level);
351
352 switch (level) {
353 case SND_SOC_BIAS_ON:
354 case SND_SOC_BIAS_PREPARE:
355 break;
356 case SND_SOC_BIAS_STANDBY:
357 if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF)
358 tas6424_power_on(component);
359 break;
360 case SND_SOC_BIAS_OFF:
361 tas6424_power_off(component);
362 break;
363 }
364
365 return 0;
366 }
367
368 static struct snd_soc_component_driver soc_codec_dev_tas6424 = {
369 .set_bias_level = tas6424_set_bias_level,
370 .controls = tas6424_snd_controls,
371 .num_controls = ARRAY_SIZE(tas6424_snd_controls),
372 .dapm_widgets = tas6424_dapm_widgets,
373 .num_dapm_widgets = ARRAY_SIZE(tas6424_dapm_widgets),
374 .dapm_routes = tas6424_audio_map,
375 .num_dapm_routes = ARRAY_SIZE(tas6424_audio_map),
376 .use_pmdown_time = 1,
377 .endianness = 1,
378 .non_legacy_dai_naming = 1,
379 };
380
381 static const struct snd_soc_dai_ops tas6424_speaker_dai_ops = {
382 .hw_params = tas6424_hw_params,
383 .set_fmt = tas6424_set_dai_fmt,
384 .set_tdm_slot = tas6424_set_dai_tdm_slot,
385 .mute_stream = tas6424_mute,
386 .no_capture_mute = 1,
387 };
388
389 static struct snd_soc_dai_driver tas6424_dai[] = {
390 {
391 .name = "tas6424-amplifier",
392 .playback = {
393 .stream_name = "Playback",
394 .channels_min = 1,
395 .channels_max = 4,
396 .rates = TAS6424_RATES,
397 .formats = TAS6424_FORMATS,
398 },
399 .ops = &tas6424_speaker_dai_ops,
400 },
401 };
402
403 static void tas6424_fault_check_work(struct work_struct *work)
404 {
405 struct tas6424_data *tas6424 = container_of(work, struct tas6424_data,
406 fault_check_work.work);
407 struct device *dev = tas6424->dev;
408 unsigned int reg;
409 int ret;
410
411 ret = regmap_read(tas6424->regmap, TAS6424_CHANNEL_FAULT, &reg);
412 if (ret < 0) {
413 dev_err(dev, "failed to read CHANNEL_FAULT register: %d\n", ret);
414 goto out;
415 }
416
417 if (!reg) {
418 tas6424->last_cfault = reg;
419 goto check_global_fault1_reg;
420 }
421
422 /*
423 * Only flag errors once for a given occurrence. This is needed as
424 * the TAS6424 will take time clearing the fault condition internally
425 * during which we don't want to bombard the system with the same
426 * error message over and over.
427 */
428 if ((reg & TAS6424_FAULT_OC_CH1) && !(tas6424->last_cfault & TAS6424_FAULT_OC_CH1))
429 dev_crit(dev, "experienced a channel 1 overcurrent fault\n");
430
431 if ((reg & TAS6424_FAULT_OC_CH2) && !(tas6424->last_cfault & TAS6424_FAULT_OC_CH2))
432 dev_crit(dev, "experienced a channel 2 overcurrent fault\n");
433
434 if ((reg & TAS6424_FAULT_OC_CH3) && !(tas6424->last_cfault & TAS6424_FAULT_OC_CH3))
435 dev_crit(dev, "experienced a channel 3 overcurrent fault\n");
436
437 if ((reg & TAS6424_FAULT_OC_CH4) && !(tas6424->last_cfault & TAS6424_FAULT_OC_CH4))
438 dev_crit(dev, "experienced a channel 4 overcurrent fault\n");
439
440 if ((reg & TAS6424_FAULT_DC_CH1) && !(tas6424->last_cfault & TAS6424_FAULT_DC_CH1))
441 dev_crit(dev, "experienced a channel 1 DC fault\n");
442
443 if ((reg & TAS6424_FAULT_DC_CH2) && !(tas6424->last_cfault & TAS6424_FAULT_DC_CH2))
444 dev_crit(dev, "experienced a channel 2 DC fault\n");
445
446 if ((reg & TAS6424_FAULT_DC_CH3) && !(tas6424->last_cfault & TAS6424_FAULT_DC_CH3))
447 dev_crit(dev, "experienced a channel 3 DC fault\n");
448
449 if ((reg & TAS6424_FAULT_DC_CH4) && !(tas6424->last_cfault & TAS6424_FAULT_DC_CH4))
450 dev_crit(dev, "experienced a channel 4 DC fault\n");
451
452 /* Store current fault1 value so we can detect any changes next time */
453 tas6424->last_cfault = reg;
454
455 check_global_fault1_reg:
456 ret = regmap_read(tas6424->regmap, TAS6424_GLOB_FAULT1, &reg);
457 if (ret < 0) {
458 dev_err(dev, "failed to read GLOB_FAULT1 register: %d\n", ret);
459 goto out;
460 }
461
462 /*
463 * Ignore any clock faults as there is no clean way to check for them.
464 * We would need to start checking for those faults *after* the SAIF
465 * stream has been setup, and stop checking *before* the stream is
466 * stopped to avoid any false-positives. However there are no
467 * appropriate hooks to monitor these events.
468 */
469 reg &= TAS6424_FAULT_PVDD_OV |
470 TAS6424_FAULT_VBAT_OV |
471 TAS6424_FAULT_PVDD_UV |
472 TAS6424_FAULT_VBAT_UV;
473
474 if (!reg) {
475 tas6424->last_fault1 = reg;
476 goto check_global_fault2_reg;
477 }
478
479 if ((reg & TAS6424_FAULT_PVDD_OV) && !(tas6424->last_fault1 & TAS6424_FAULT_PVDD_OV))
480 dev_crit(dev, "experienced a PVDD overvoltage fault\n");
481
482 if ((reg & TAS6424_FAULT_VBAT_OV) && !(tas6424->last_fault1 & TAS6424_FAULT_VBAT_OV))
483 dev_crit(dev, "experienced a VBAT overvoltage fault\n");
484
485 if ((reg & TAS6424_FAULT_PVDD_UV) && !(tas6424->last_fault1 & TAS6424_FAULT_PVDD_UV))
486 dev_crit(dev, "experienced a PVDD undervoltage fault\n");
487
488 if ((reg & TAS6424_FAULT_VBAT_UV) && !(tas6424->last_fault1 & TAS6424_FAULT_VBAT_UV))
489 dev_crit(dev, "experienced a VBAT undervoltage fault\n");
490
491 /* Store current fault1 value so we can detect any changes next time */
492 tas6424->last_fault1 = reg;
493
494 check_global_fault2_reg:
495 ret = regmap_read(tas6424->regmap, TAS6424_GLOB_FAULT2, &reg);
496 if (ret < 0) {
497 dev_err(dev, "failed to read GLOB_FAULT2 register: %d\n", ret);
498 goto out;
499 }
500
501 reg &= TAS6424_FAULT_OTSD |
502 TAS6424_FAULT_OTSD_CH1 |
503 TAS6424_FAULT_OTSD_CH2 |
504 TAS6424_FAULT_OTSD_CH3 |
505 TAS6424_FAULT_OTSD_CH4;
506
507 if (!reg) {
508 tas6424->last_fault2 = reg;
509 goto check_warn_reg;
510 }
511
512 if ((reg & TAS6424_FAULT_OTSD) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD))
513 dev_crit(dev, "experienced a global overtemp shutdown\n");
514
515 if ((reg & TAS6424_FAULT_OTSD_CH1) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH1))
516 dev_crit(dev, "experienced an overtemp shutdown on CH1\n");
517
518 if ((reg & TAS6424_FAULT_OTSD_CH2) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH2))
519 dev_crit(dev, "experienced an overtemp shutdown on CH2\n");
520
521 if ((reg & TAS6424_FAULT_OTSD_CH3) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH3))
522 dev_crit(dev, "experienced an overtemp shutdown on CH3\n");
523
524 if ((reg & TAS6424_FAULT_OTSD_CH4) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH4))
525 dev_crit(dev, "experienced an overtemp shutdown on CH4\n");
526
527 /* Store current fault2 value so we can detect any changes next time */
528 tas6424->last_fault2 = reg;
529
530 check_warn_reg:
531 ret = regmap_read(tas6424->regmap, TAS6424_WARN, &reg);
532 if (ret < 0) {
533 dev_err(dev, "failed to read WARN register: %d\n", ret);
534 goto out;
535 }
536
537 reg &= TAS6424_WARN_VDD_UV |
538 TAS6424_WARN_VDD_POR |
539 TAS6424_WARN_VDD_OTW |
540 TAS6424_WARN_VDD_OTW_CH1 |
541 TAS6424_WARN_VDD_OTW_CH2 |
542 TAS6424_WARN_VDD_OTW_CH3 |
543 TAS6424_WARN_VDD_OTW_CH4;
544
545 if (!reg) {
546 tas6424->last_warn = reg;
547 goto out;
548 }
549
550 if ((reg & TAS6424_WARN_VDD_UV) && !(tas6424->last_warn & TAS6424_WARN_VDD_UV))
551 dev_warn(dev, "experienced a VDD under voltage condition\n");
552
553 if ((reg & TAS6424_WARN_VDD_POR) && !(tas6424->last_warn & TAS6424_WARN_VDD_POR))
554 dev_warn(dev, "experienced a VDD POR condition\n");
555
556 if ((reg & TAS6424_WARN_VDD_OTW) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW))
557 dev_warn(dev, "experienced a global overtemp warning\n");
558
559 if ((reg & TAS6424_WARN_VDD_OTW_CH1) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH1))
560 dev_warn(dev, "experienced an overtemp warning on CH1\n");
561
562 if ((reg & TAS6424_WARN_VDD_OTW_CH2) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH2))
563 dev_warn(dev, "experienced an overtemp warning on CH2\n");
564
565 if ((reg & TAS6424_WARN_VDD_OTW_CH3) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH3))
566 dev_warn(dev, "experienced an overtemp warning on CH3\n");
567
568 if ((reg & TAS6424_WARN_VDD_OTW_CH4) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH4))
569 dev_warn(dev, "experienced an overtemp warning on CH4\n");
570
571 /* Store current warn value so we can detect any changes next time */
572 tas6424->last_warn = reg;
573
574 /* Clear any warnings by toggling the CLEAR_FAULT control bit */
575 ret = regmap_write_bits(tas6424->regmap, TAS6424_MISC_CTRL3,
576 TAS6424_CLEAR_FAULT, TAS6424_CLEAR_FAULT);
577 if (ret < 0)
578 dev_err(dev, "failed to write MISC_CTRL3 register: %d\n", ret);
579
580 ret = regmap_write_bits(tas6424->regmap, TAS6424_MISC_CTRL3,
581 TAS6424_CLEAR_FAULT, 0);
582 if (ret < 0)
583 dev_err(dev, "failed to write MISC_CTRL3 register: %d\n", ret);
584
585 out:
586 /* Schedule the next fault check at the specified interval */
587 schedule_delayed_work(&tas6424->fault_check_work,
588 msecs_to_jiffies(TAS6424_FAULT_CHECK_INTERVAL));
589 }
590
591 static const struct reg_default tas6424_reg_defaults[] = {
592 { TAS6424_MODE_CTRL, 0x00 },
593 { TAS6424_MISC_CTRL1, 0x32 },
594 { TAS6424_MISC_CTRL2, 0x62 },
595 { TAS6424_SAP_CTRL, 0x04 },
596 { TAS6424_CH_STATE_CTRL, 0x55 },
597 { TAS6424_CH1_VOL_CTRL, 0xcf },
598 { TAS6424_CH2_VOL_CTRL, 0xcf },
599 { TAS6424_CH3_VOL_CTRL, 0xcf },
600 { TAS6424_CH4_VOL_CTRL, 0xcf },
601 { TAS6424_DC_DIAG_CTRL1, 0x00 },
602 { TAS6424_DC_DIAG_CTRL2, 0x11 },
603 { TAS6424_DC_DIAG_CTRL3, 0x11 },
604 { TAS6424_PIN_CTRL, 0xff },
605 { TAS6424_AC_DIAG_CTRL1, 0x00 },
606 { TAS6424_MISC_CTRL3, 0x00 },
607 { TAS6424_CLIP_CTRL, 0x01 },
608 { TAS6424_CLIP_WINDOW, 0x14 },
609 { TAS6424_CLIP_WARN, 0x00 },
610 { TAS6424_CBC_STAT, 0x00 },
611 { TAS6424_MISC_CTRL4, 0x40 },
612 };
613
614 static bool tas6424_is_writable_reg(struct device *dev, unsigned int reg)
615 {
616 switch (reg) {
617 case TAS6424_MODE_CTRL:
618 case TAS6424_MISC_CTRL1:
619 case TAS6424_MISC_CTRL2:
620 case TAS6424_SAP_CTRL:
621 case TAS6424_CH_STATE_CTRL:
622 case TAS6424_CH1_VOL_CTRL:
623 case TAS6424_CH2_VOL_CTRL:
624 case TAS6424_CH3_VOL_CTRL:
625 case TAS6424_CH4_VOL_CTRL:
626 case TAS6424_DC_DIAG_CTRL1:
627 case TAS6424_DC_DIAG_CTRL2:
628 case TAS6424_DC_DIAG_CTRL3:
629 case TAS6424_PIN_CTRL:
630 case TAS6424_AC_DIAG_CTRL1:
631 case TAS6424_MISC_CTRL3:
632 case TAS6424_CLIP_CTRL:
633 case TAS6424_CLIP_WINDOW:
634 case TAS6424_CLIP_WARN:
635 case TAS6424_CBC_STAT:
636 case TAS6424_MISC_CTRL4:
637 return true;
638 default:
639 return false;
640 }
641 }
642
643 static bool tas6424_is_volatile_reg(struct device *dev, unsigned int reg)
644 {
645 switch (reg) {
646 case TAS6424_DC_LOAD_DIAG_REP12:
647 case TAS6424_DC_LOAD_DIAG_REP34:
648 case TAS6424_DC_LOAD_DIAG_REPLO:
649 case TAS6424_CHANNEL_STATE:
650 case TAS6424_CHANNEL_FAULT:
651 case TAS6424_GLOB_FAULT1:
652 case TAS6424_GLOB_FAULT2:
653 case TAS6424_WARN:
654 case TAS6424_AC_LOAD_DIAG_REP1:
655 case TAS6424_AC_LOAD_DIAG_REP2:
656 case TAS6424_AC_LOAD_DIAG_REP3:
657 case TAS6424_AC_LOAD_DIAG_REP4:
658 return true;
659 default:
660 return false;
661 }
662 }
663
664 static const struct regmap_config tas6424_regmap_config = {
665 .reg_bits = 8,
666 .val_bits = 8,
667
668 .writeable_reg = tas6424_is_writable_reg,
669 .volatile_reg = tas6424_is_volatile_reg,
670
671 .max_register = TAS6424_MAX,
672 .reg_defaults = tas6424_reg_defaults,
673 .num_reg_defaults = ARRAY_SIZE(tas6424_reg_defaults),
674 .cache_type = REGCACHE_RBTREE,
675 };
676
677 #if IS_ENABLED(CONFIG_OF)
678 static const struct of_device_id tas6424_of_ids[] = {
679 { .compatible = "ti,tas6424", },
680 { },
681 };
682 MODULE_DEVICE_TABLE(of, tas6424_of_ids);
683 #endif
684
685 static int tas6424_i2c_probe(struct i2c_client *client,
686 const struct i2c_device_id *id)
687 {
688 struct device *dev = &client->dev;
689 struct tas6424_data *tas6424;
690 int ret;
691 int i;
692
693 tas6424 = devm_kzalloc(dev, sizeof(*tas6424), GFP_KERNEL);
694 if (!tas6424)
695 return -ENOMEM;
696 dev_set_drvdata(dev, tas6424);
697
698 tas6424->dev = dev;
699
700 tas6424->regmap = devm_regmap_init_i2c(client, &tas6424_regmap_config);
701 if (IS_ERR(tas6424->regmap)) {
702 ret = PTR_ERR(tas6424->regmap);
703 dev_err(dev, "unable to allocate register map: %d\n", ret);
704 return ret;
705 }
706
707 /*
708 * Get control of the standby pin and set it LOW to take the codec
709 * out of the stand-by mode.
710 * Note: The actual pin polarity is taken care of in the GPIO lib
711 * according the polarity specified in the DTS.
712 */
713 tas6424->standby_gpio = devm_gpiod_get_optional(dev, "standby",
714 GPIOD_OUT_LOW);
715 if (IS_ERR(tas6424->standby_gpio)) {
716 if (PTR_ERR(tas6424->standby_gpio) == -EPROBE_DEFER)
717 return -EPROBE_DEFER;
718 dev_info(dev, "failed to get standby GPIO: %ld\n",
719 PTR_ERR(tas6424->standby_gpio));
720 tas6424->standby_gpio = NULL;
721 }
722
723 /*
724 * Get control of the mute pin and set it HIGH in order to start with
725 * all the output muted.
726 * Note: The actual pin polarity is taken care of in the GPIO lib
727 * according the polarity specified in the DTS.
728 */
729 tas6424->mute_gpio = devm_gpiod_get_optional(dev, "mute",
730 GPIOD_OUT_HIGH);
731 if (IS_ERR(tas6424->mute_gpio)) {
732 if (PTR_ERR(tas6424->mute_gpio) == -EPROBE_DEFER)
733 return -EPROBE_DEFER;
734 dev_info(dev, "failed to get nmute GPIO: %ld\n",
735 PTR_ERR(tas6424->mute_gpio));
736 tas6424->mute_gpio = NULL;
737 }
738
739 for (i = 0; i < ARRAY_SIZE(tas6424->supplies); i++)
740 tas6424->supplies[i].supply = tas6424_supply_names[i];
741 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tas6424->supplies),
742 tas6424->supplies);
743 if (ret) {
744 dev_err(dev, "unable to request supplies: %d\n", ret);
745 return ret;
746 }
747
748 ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),
749 tas6424->supplies);
750 if (ret) {
751 dev_err(dev, "unable to enable supplies: %d\n", ret);
752 return ret;
753 }
754
755 /* Reset device to establish well-defined startup state */
756 ret = regmap_update_bits(tas6424->regmap, TAS6424_MODE_CTRL,
757 TAS6424_RESET, TAS6424_RESET);
758 if (ret) {
759 dev_err(dev, "unable to reset device: %d\n", ret);
760 return ret;
761 }
762
763 INIT_DELAYED_WORK(&tas6424->fault_check_work, tas6424_fault_check_work);
764
765 ret = devm_snd_soc_register_component(dev, &soc_codec_dev_tas6424,
766 tas6424_dai, ARRAY_SIZE(tas6424_dai));
767 if (ret < 0) {
768 dev_err(dev, "unable to register codec: %d\n", ret);
769 return ret;
770 }
771
772 return 0;
773 }
774
775 static int tas6424_i2c_remove(struct i2c_client *client)
776 {
777 struct device *dev = &client->dev;
778 struct tas6424_data *tas6424 = dev_get_drvdata(dev);
779 int ret;
780
781 cancel_delayed_work_sync(&tas6424->fault_check_work);
782
783 /* put the codec in stand-by */
784 if (tas6424->standby_gpio)
785 gpiod_set_value_cansleep(tas6424->standby_gpio, 1);
786
787 ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),
788 tas6424->supplies);
789 if (ret < 0) {
790 dev_err(dev, "unable to disable supplies: %d\n", ret);
791 return ret;
792 }
793
794 return 0;
795 }
796
797 static const struct i2c_device_id tas6424_i2c_ids[] = {
798 { "tas6424", 0 },
799 { }
800 };
801 MODULE_DEVICE_TABLE(i2c, tas6424_i2c_ids);
802
803 static struct i2c_driver tas6424_i2c_driver = {
804 .driver = {
805 .name = "tas6424",
806 .of_match_table = of_match_ptr(tas6424_of_ids),
807 },
808 .probe = tas6424_i2c_probe,
809 .remove = tas6424_i2c_remove,
810 .id_table = tas6424_i2c_ids,
811 };
812 module_i2c_driver(tas6424_i2c_driver);
813
814 MODULE_AUTHOR("Andreas Dannenberg <dannenberg@ti.com>");
815 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
816 MODULE_DESCRIPTION("TAS6424 Audio amplifier driver");
817 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support