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Linux/sound/soc/codecs/tas6424.c

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  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 - http://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 
 20 #include <sound/pcm.h>
 21 #include <sound/pcm_params.h>
 22 #include <sound/soc.h>
 23 #include <sound/soc-dapm.h>
 24 #include <sound/tlv.h>
 25 
 26 #include "tas6424.h"
 27 
 28 /* Define how often to check (and clear) the fault status register (in ms) */
 29 #define TAS6424_FAULT_CHECK_INTERVAL 200
 30 
 31 static const char * const tas6424_supply_names[] = {
 32         "dvdd", /* Digital power supply. Connect to 3.3-V supply. */
 33         "vbat", /* Supply used for higher voltage analog circuits. */
 34         "pvdd", /* Class-D amp output FETs supply. */
 35 };
 36 #define TAS6424_NUM_SUPPLIES ARRAY_SIZE(tas6424_supply_names)
 37 
 38 struct tas6424_data {
 39         struct device *dev;
 40         struct regmap *regmap;
 41         struct regulator_bulk_data supplies[TAS6424_NUM_SUPPLIES];
 42         struct delayed_work fault_check_work;
 43         unsigned int last_fault1;
 44         unsigned int last_fault2;
 45         unsigned int last_warn;
 46 };
 47 
 48 /*
 49  * DAC digital volumes. From -103.5 to 24 dB in 0.5 dB steps. Note that
 50  * setting the gain below -100 dB (register value <0x7) is effectively a MUTE
 51  * as per device datasheet.
 52  */
 53 static DECLARE_TLV_DB_SCALE(dac_tlv, -10350, 50, 0);
 54 
 55 static const struct snd_kcontrol_new tas6424_snd_controls[] = {
 56         SOC_SINGLE_TLV("Speaker Driver CH1 Playback Volume",
 57                        TAS6424_CH1_VOL_CTRL, 0, 0xff, 0, dac_tlv),
 58         SOC_SINGLE_TLV("Speaker Driver CH2 Playback Volume",
 59                        TAS6424_CH2_VOL_CTRL, 0, 0xff, 0, dac_tlv),
 60         SOC_SINGLE_TLV("Speaker Driver CH3 Playback Volume",
 61                        TAS6424_CH3_VOL_CTRL, 0, 0xff, 0, dac_tlv),
 62         SOC_SINGLE_TLV("Speaker Driver CH4 Playback Volume",
 63                        TAS6424_CH4_VOL_CTRL, 0, 0xff, 0, dac_tlv),
 64 };
 65 
 66 static int tas6424_dac_event(struct snd_soc_dapm_widget *w,
 67                              struct snd_kcontrol *kcontrol, int event)
 68 {
 69         struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
 70         struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
 71 
 72         dev_dbg(component->dev, "%s() event=0x%0x\n", __func__, event);
 73 
 74         if (event & SND_SOC_DAPM_POST_PMU) {
 75                 /* Observe codec shutdown-to-active time */
 76                 msleep(12);
 77 
 78                 /* Turn on TAS6424 periodic fault checking/handling */
 79                 tas6424->last_fault1 = 0;
 80                 tas6424->last_fault2 = 0;
 81                 tas6424->last_warn = 0;
 82                 schedule_delayed_work(&tas6424->fault_check_work,
 83                                       msecs_to_jiffies(TAS6424_FAULT_CHECK_INTERVAL));
 84         } else if (event & SND_SOC_DAPM_PRE_PMD) {
 85                 /* Disable TAS6424 periodic fault checking/handling */
 86                 cancel_delayed_work_sync(&tas6424->fault_check_work);
 87         }
 88 
 89         return 0;
 90 }
 91 
 92 static const struct snd_soc_dapm_widget tas6424_dapm_widgets[] = {
 93         SND_SOC_DAPM_AIF_IN("DAC IN", "Playback", 0, SND_SOC_NOPM, 0, 0),
 94         SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, tas6424_dac_event,
 95                            SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
 96         SND_SOC_DAPM_OUTPUT("OUT")
 97 };
 98 
 99 static const struct snd_soc_dapm_route tas6424_audio_map[] = {
100         { "DAC", NULL, "DAC IN" },
101         { "OUT", NULL, "DAC" },
102 };
103 
104 static int tas6424_hw_params(struct snd_pcm_substream *substream,
105                              struct snd_pcm_hw_params *params,
106                              struct snd_soc_dai *dai)
107 {
108         struct snd_soc_component *component = dai->component;
109         unsigned int rate = params_rate(params);
110         unsigned int width = params_width(params);
111         u8 sap_ctrl = 0;
112 
113         dev_dbg(component->dev, "%s() rate=%u width=%u\n", __func__, rate, width);
114 
115         switch (rate) {
116         case 44100:
117                 sap_ctrl |= TAS6424_SAP_RATE_44100;
118                 break;
119         case 48000:
120                 sap_ctrl |= TAS6424_SAP_RATE_48000;
121                 break;
122         case 96000:
123                 sap_ctrl |= TAS6424_SAP_RATE_96000;
124                 break;
125         default:
126                 dev_err(component->dev, "unsupported sample rate: %u\n", rate);
127                 return -EINVAL;
128         }
129 
130         switch (width) {
131         case 16:
132                 sap_ctrl |= TAS6424_SAP_TDM_SLOT_SZ_16;
133                 break;
134         case 24:
135                 break;
136         default:
137                 dev_err(component->dev, "unsupported sample width: %u\n", width);
138                 return -EINVAL;
139         }
140 
141         snd_soc_component_update_bits(component, TAS6424_SAP_CTRL,
142                             TAS6424_SAP_RATE_MASK |
143                             TAS6424_SAP_TDM_SLOT_SZ_16,
144                             sap_ctrl);
145 
146         return 0;
147 }
148 
149 static int tas6424_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
150 {
151         struct snd_soc_component *component = dai->component;
152         u8 serial_format = 0;
153 
154         dev_dbg(component->dev, "%s() fmt=0x%0x\n", __func__, fmt);
155 
156         /* clock masters */
157         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
158         case SND_SOC_DAIFMT_CBS_CFS:
159                 break;
160         default:
161                 dev_err(component->dev, "Invalid DAI master/slave interface\n");
162                 return -EINVAL;
163         }
164 
165         /* signal polarity */
166         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
167         case SND_SOC_DAIFMT_NB_NF:
168                 break;
169         default:
170                 dev_err(component->dev, "Invalid DAI clock signal polarity\n");
171                 return -EINVAL;
172         }
173 
174         /* interface format */
175         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
176         case SND_SOC_DAIFMT_I2S:
177                 serial_format |= TAS6424_SAP_I2S;
178                 break;
179         case SND_SOC_DAIFMT_DSP_A:
180                 serial_format |= TAS6424_SAP_DSP;
181                 break;
182         case SND_SOC_DAIFMT_DSP_B:
183                 /*
184                  * We can use the fact that the TAS6424 does not care about the
185                  * LRCLK duty cycle during TDM to receive DSP_B formatted data
186                  * in LEFTJ mode (no delaying of the 1st data bit).
187                  */
188                 serial_format |= TAS6424_SAP_LEFTJ;
189                 break;
190         case SND_SOC_DAIFMT_LEFT_J:
191                 serial_format |= TAS6424_SAP_LEFTJ;
192                 break;
193         default:
194                 dev_err(component->dev, "Invalid DAI interface format\n");
195                 return -EINVAL;
196         }
197 
198         snd_soc_component_update_bits(component, TAS6424_SAP_CTRL,
199                             TAS6424_SAP_FMT_MASK, serial_format);
200 
201         return 0;
202 }
203 
204 static int tas6424_set_dai_tdm_slot(struct snd_soc_dai *dai,
205                                     unsigned int tx_mask, unsigned int rx_mask,
206                                     int slots, int slot_width)
207 {
208         struct snd_soc_component *component = dai->component;
209         unsigned int first_slot, last_slot;
210         bool sap_tdm_slot_last;
211 
212         dev_dbg(component->dev, "%s() tx_mask=%d rx_mask=%d\n", __func__,
213                 tx_mask, rx_mask);
214 
215         if (!tx_mask || !rx_mask)
216                 return 0; /* nothing needed to disable TDM mode */
217 
218         /*
219          * Determine the first slot and last slot that is being requested so
220          * we'll be able to more easily enforce certain constraints as the
221          * TAS6424's TDM interface is not fully configurable.
222          */
223         first_slot = __ffs(tx_mask);
224         last_slot = __fls(rx_mask);
225 
226         if (last_slot - first_slot != 4) {
227                 dev_err(component->dev, "tdm mask must cover 4 contiguous slots\n");
228                 return -EINVAL;
229         }
230 
231         switch (first_slot) {
232         case 0:
233                 sap_tdm_slot_last = false;
234                 break;
235         case 4:
236                 sap_tdm_slot_last = true;
237                 break;
238         default:
239                 dev_err(component->dev, "tdm mask must start at slot 0 or 4\n");
240                 return -EINVAL;
241         }
242 
243         snd_soc_component_update_bits(component, TAS6424_SAP_CTRL, TAS6424_SAP_TDM_SLOT_LAST,
244                             sap_tdm_slot_last ? TAS6424_SAP_TDM_SLOT_LAST : 0);
245 
246         return 0;
247 }
248 
249 static int tas6424_mute(struct snd_soc_dai *dai, int mute)
250 {
251         struct snd_soc_component *component = dai->component;
252         unsigned int val;
253 
254         dev_dbg(component->dev, "%s() mute=%d\n", __func__, mute);
255 
256         if (mute)
257                 val = TAS6424_ALL_STATE_MUTE;
258         else
259                 val = TAS6424_ALL_STATE_PLAY;
260 
261         snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, val);
262 
263         return 0;
264 }
265 
266 static int tas6424_power_off(struct snd_soc_component *component)
267 {
268         struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
269         int ret;
270 
271         snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, TAS6424_ALL_STATE_HIZ);
272 
273         regcache_cache_only(tas6424->regmap, true);
274         regcache_mark_dirty(tas6424->regmap);
275 
276         ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),
277                                      tas6424->supplies);
278         if (ret < 0) {
279                 dev_err(component->dev, "failed to disable supplies: %d\n", ret);
280                 return ret;
281         }
282 
283         return 0;
284 }
285 
286 static int tas6424_power_on(struct snd_soc_component *component)
287 {
288         struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
289         int ret;
290 
291         ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),
292                                     tas6424->supplies);
293         if (ret < 0) {
294                 dev_err(component->dev, "failed to enable supplies: %d\n", ret);
295                 return ret;
296         }
297 
298         regcache_cache_only(tas6424->regmap, false);
299 
300         ret = regcache_sync(tas6424->regmap);
301         if (ret < 0) {
302                 dev_err(component->dev, "failed to sync regcache: %d\n", ret);
303                 return ret;
304         }
305 
306         snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, TAS6424_ALL_STATE_MUTE);
307 
308         /* any time we come out of HIZ, the output channels automatically run DC
309          * load diagnostics, wait here until this completes
310          */
311         msleep(230);
312 
313         return 0;
314 }
315 
316 static int tas6424_set_bias_level(struct snd_soc_component *component,
317                                   enum snd_soc_bias_level level)
318 {
319         dev_dbg(component->dev, "%s() level=%d\n", __func__, level);
320 
321         switch (level) {
322         case SND_SOC_BIAS_ON:
323         case SND_SOC_BIAS_PREPARE:
324                 break;
325         case SND_SOC_BIAS_STANDBY:
326                 if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF)
327                         tas6424_power_on(component);
328                 break;
329         case SND_SOC_BIAS_OFF:
330                 tas6424_power_off(component);
331                 break;
332         }
333 
334         return 0;
335 }
336 
337 static struct snd_soc_component_driver soc_codec_dev_tas6424 = {
338         .set_bias_level         = tas6424_set_bias_level,
339         .controls               = tas6424_snd_controls,
340         .num_controls           = ARRAY_SIZE(tas6424_snd_controls),
341         .dapm_widgets           = tas6424_dapm_widgets,
342         .num_dapm_widgets       = ARRAY_SIZE(tas6424_dapm_widgets),
343         .dapm_routes            = tas6424_audio_map,
344         .num_dapm_routes        = ARRAY_SIZE(tas6424_audio_map),
345         .use_pmdown_time        = 1,
346         .endianness             = 1,
347         .non_legacy_dai_naming  = 1,
348 };
349 
350 static struct snd_soc_dai_ops tas6424_speaker_dai_ops = {
351         .hw_params      = tas6424_hw_params,
352         .set_fmt        = tas6424_set_dai_fmt,
353         .set_tdm_slot   = tas6424_set_dai_tdm_slot,
354         .digital_mute   = tas6424_mute,
355 };
356 
357 static struct snd_soc_dai_driver tas6424_dai[] = {
358         {
359                 .name = "tas6424-amplifier",
360                 .playback = {
361                         .stream_name = "Playback",
362                         .channels_min = 1,
363                         .channels_max = 4,
364                         .rates = TAS6424_RATES,
365                         .formats = TAS6424_FORMATS,
366                 },
367                 .ops = &tas6424_speaker_dai_ops,
368         },
369 };
370 
371 static void tas6424_fault_check_work(struct work_struct *work)
372 {
373         struct tas6424_data *tas6424 = container_of(work, struct tas6424_data,
374                                                     fault_check_work.work);
375         struct device *dev = tas6424->dev;
376         unsigned int reg;
377         int ret;
378 
379         ret = regmap_read(tas6424->regmap, TAS6424_GLOB_FAULT1, &reg);
380         if (ret < 0) {
381                 dev_err(dev, "failed to read FAULT1 register: %d\n", ret);
382                 goto out;
383         }
384 
385         /*
386          * Ignore any clock faults as there is no clean way to check for them.
387          * We would need to start checking for those faults *after* the SAIF
388          * stream has been setup, and stop checking *before* the stream is
389          * stopped to avoid any false-positives. However there are no
390          * appropriate hooks to monitor these events.
391          */
392         reg &= TAS6424_FAULT_PVDD_OV |
393                TAS6424_FAULT_VBAT_OV |
394                TAS6424_FAULT_PVDD_UV |
395                TAS6424_FAULT_VBAT_UV;
396 
397         if (reg)
398                 goto check_global_fault2_reg;
399 
400         /*
401          * Only flag errors once for a given occurrence. This is needed as
402          * the TAS6424 will take time clearing the fault condition internally
403          * during which we don't want to bombard the system with the same
404          * error message over and over.
405          */
406         if ((reg & TAS6424_FAULT_PVDD_OV) && !(tas6424->last_fault1 & TAS6424_FAULT_PVDD_OV))
407                 dev_crit(dev, "experienced a PVDD overvoltage fault\n");
408 
409         if ((reg & TAS6424_FAULT_VBAT_OV) && !(tas6424->last_fault1 & TAS6424_FAULT_VBAT_OV))
410                 dev_crit(dev, "experienced a VBAT overvoltage fault\n");
411 
412         if ((reg & TAS6424_FAULT_PVDD_UV) && !(tas6424->last_fault1 & TAS6424_FAULT_PVDD_UV))
413                 dev_crit(dev, "experienced a PVDD undervoltage fault\n");
414 
415         if ((reg & TAS6424_FAULT_VBAT_UV) && !(tas6424->last_fault1 & TAS6424_FAULT_VBAT_UV))
416                 dev_crit(dev, "experienced a VBAT undervoltage fault\n");
417 
418         /* Store current fault1 value so we can detect any changes next time */
419         tas6424->last_fault1 = reg;
420 
421 check_global_fault2_reg:
422         ret = regmap_read(tas6424->regmap, TAS6424_GLOB_FAULT2, &reg);
423         if (ret < 0) {
424                 dev_err(dev, "failed to read FAULT2 register: %d\n", ret);
425                 goto out;
426         }
427 
428         reg &= TAS6424_FAULT_OTSD |
429                TAS6424_FAULT_OTSD_CH1 |
430                TAS6424_FAULT_OTSD_CH2 |
431                TAS6424_FAULT_OTSD_CH3 |
432                TAS6424_FAULT_OTSD_CH4;
433 
434         if (!reg)
435                 goto check_warn_reg;
436 
437         if ((reg & TAS6424_FAULT_OTSD) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD))
438                 dev_crit(dev, "experienced a global overtemp shutdown\n");
439 
440         if ((reg & TAS6424_FAULT_OTSD_CH1) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH1))
441                 dev_crit(dev, "experienced an overtemp shutdown on CH1\n");
442 
443         if ((reg & TAS6424_FAULT_OTSD_CH2) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH2))
444                 dev_crit(dev, "experienced an overtemp shutdown on CH2\n");
445 
446         if ((reg & TAS6424_FAULT_OTSD_CH3) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH3))
447                 dev_crit(dev, "experienced an overtemp shutdown on CH3\n");
448 
449         if ((reg & TAS6424_FAULT_OTSD_CH4) && !(tas6424->last_fault2 & TAS6424_FAULT_OTSD_CH4))
450                 dev_crit(dev, "experienced an overtemp shutdown on CH4\n");
451 
452         /* Store current fault2 value so we can detect any changes next time */
453         tas6424->last_fault2 = reg;
454 
455 check_warn_reg:
456         ret = regmap_read(tas6424->regmap, TAS6424_WARN, &reg);
457         if (ret < 0) {
458                 dev_err(dev, "failed to read WARN register: %d\n", ret);
459                 goto out;
460         }
461 
462         reg &= TAS6424_WARN_VDD_UV |
463                TAS6424_WARN_VDD_POR |
464                TAS6424_WARN_VDD_OTW |
465                TAS6424_WARN_VDD_OTW_CH1 |
466                TAS6424_WARN_VDD_OTW_CH2 |
467                TAS6424_WARN_VDD_OTW_CH3 |
468                TAS6424_WARN_VDD_OTW_CH4;
469 
470         if (!reg)
471                 goto out;
472 
473         if ((reg & TAS6424_WARN_VDD_UV) && !(tas6424->last_warn & TAS6424_WARN_VDD_UV))
474                 dev_warn(dev, "experienced a VDD under voltage condition\n");
475 
476         if ((reg & TAS6424_WARN_VDD_POR) && !(tas6424->last_warn & TAS6424_WARN_VDD_POR))
477                 dev_warn(dev, "experienced a VDD POR condition\n");
478 
479         if ((reg & TAS6424_WARN_VDD_OTW) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW))
480                 dev_warn(dev, "experienced a global overtemp warning\n");
481 
482         if ((reg & TAS6424_WARN_VDD_OTW_CH1) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH1))
483                 dev_warn(dev, "experienced an overtemp warning on CH1\n");
484 
485         if ((reg & TAS6424_WARN_VDD_OTW_CH2) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH2))
486                 dev_warn(dev, "experienced an overtemp warning on CH2\n");
487 
488         if ((reg & TAS6424_WARN_VDD_OTW_CH3) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH3))
489                 dev_warn(dev, "experienced an overtemp warning on CH3\n");
490 
491         if ((reg & TAS6424_WARN_VDD_OTW_CH4) && !(tas6424->last_warn & TAS6424_WARN_VDD_OTW_CH4))
492                 dev_warn(dev, "experienced an overtemp warning on CH4\n");
493 
494         /* Store current warn value so we can detect any changes next time */
495         tas6424->last_warn = reg;
496 
497         /* Clear any faults by toggling the CLEAR_FAULT control bit */
498         ret = regmap_write_bits(tas6424->regmap, TAS6424_MISC_CTRL3,
499                                 TAS6424_CLEAR_FAULT, TAS6424_CLEAR_FAULT);
500         if (ret < 0)
501                 dev_err(dev, "failed to write MISC_CTRL3 register: %d\n", ret);
502 
503         ret = regmap_write_bits(tas6424->regmap, TAS6424_MISC_CTRL3,
504                                 TAS6424_CLEAR_FAULT, 0);
505         if (ret < 0)
506                 dev_err(dev, "failed to write MISC_CTRL3 register: %d\n", ret);
507 
508 out:
509         /* Schedule the next fault check at the specified interval */
510         schedule_delayed_work(&tas6424->fault_check_work,
511                               msecs_to_jiffies(TAS6424_FAULT_CHECK_INTERVAL));
512 }
513 
514 static const struct reg_default tas6424_reg_defaults[] = {
515         { TAS6424_MODE_CTRL,            0x00 },
516         { TAS6424_MISC_CTRL1,           0x32 },
517         { TAS6424_MISC_CTRL2,           0x62 },
518         { TAS6424_SAP_CTRL,             0x04 },
519         { TAS6424_CH_STATE_CTRL,        0x55 },
520         { TAS6424_CH1_VOL_CTRL,         0xcf },
521         { TAS6424_CH2_VOL_CTRL,         0xcf },
522         { TAS6424_CH3_VOL_CTRL,         0xcf },
523         { TAS6424_CH4_VOL_CTRL,         0xcf },
524         { TAS6424_DC_DIAG_CTRL1,        0x00 },
525         { TAS6424_DC_DIAG_CTRL2,        0x11 },
526         { TAS6424_DC_DIAG_CTRL3,        0x11 },
527         { TAS6424_PIN_CTRL,             0xff },
528         { TAS6424_AC_DIAG_CTRL1,        0x00 },
529         { TAS6424_MISC_CTRL3,           0x00 },
530         { TAS6424_CLIP_CTRL,            0x01 },
531         { TAS6424_CLIP_WINDOW,          0x14 },
532         { TAS6424_CLIP_WARN,            0x00 },
533         { TAS6424_CBC_STAT,             0x00 },
534         { TAS6424_MISC_CTRL4,           0x40 },
535 };
536 
537 static bool tas6424_is_writable_reg(struct device *dev, unsigned int reg)
538 {
539         switch (reg) {
540         case TAS6424_MODE_CTRL:
541         case TAS6424_MISC_CTRL1:
542         case TAS6424_MISC_CTRL2:
543         case TAS6424_SAP_CTRL:
544         case TAS6424_CH_STATE_CTRL:
545         case TAS6424_CH1_VOL_CTRL:
546         case TAS6424_CH2_VOL_CTRL:
547         case TAS6424_CH3_VOL_CTRL:
548         case TAS6424_CH4_VOL_CTRL:
549         case TAS6424_DC_DIAG_CTRL1:
550         case TAS6424_DC_DIAG_CTRL2:
551         case TAS6424_DC_DIAG_CTRL3:
552         case TAS6424_PIN_CTRL:
553         case TAS6424_AC_DIAG_CTRL1:
554         case TAS6424_MISC_CTRL3:
555         case TAS6424_CLIP_CTRL:
556         case TAS6424_CLIP_WINDOW:
557         case TAS6424_CLIP_WARN:
558         case TAS6424_CBC_STAT:
559         case TAS6424_MISC_CTRL4:
560                 return true;
561         default:
562                 return false;
563         }
564 }
565 
566 static bool tas6424_is_volatile_reg(struct device *dev, unsigned int reg)
567 {
568         switch (reg) {
569         case TAS6424_DC_LOAD_DIAG_REP12:
570         case TAS6424_DC_LOAD_DIAG_REP34:
571         case TAS6424_DC_LOAD_DIAG_REPLO:
572         case TAS6424_CHANNEL_STATE:
573         case TAS6424_CHANNEL_FAULT:
574         case TAS6424_GLOB_FAULT1:
575         case TAS6424_GLOB_FAULT2:
576         case TAS6424_WARN:
577         case TAS6424_AC_LOAD_DIAG_REP1:
578         case TAS6424_AC_LOAD_DIAG_REP2:
579         case TAS6424_AC_LOAD_DIAG_REP3:
580         case TAS6424_AC_LOAD_DIAG_REP4:
581                 return true;
582         default:
583                 return false;
584         }
585 }
586 
587 static const struct regmap_config tas6424_regmap_config = {
588         .reg_bits = 8,
589         .val_bits = 8,
590 
591         .writeable_reg = tas6424_is_writable_reg,
592         .volatile_reg = tas6424_is_volatile_reg,
593 
594         .max_register = TAS6424_MAX,
595         .reg_defaults = tas6424_reg_defaults,
596         .num_reg_defaults = ARRAY_SIZE(tas6424_reg_defaults),
597         .cache_type = REGCACHE_RBTREE,
598 };
599 
600 #if IS_ENABLED(CONFIG_OF)
601 static const struct of_device_id tas6424_of_ids[] = {
602         { .compatible = "ti,tas6424", },
603         { },
604 };
605 MODULE_DEVICE_TABLE(of, tas6424_of_ids);
606 #endif
607 
608 static int tas6424_i2c_probe(struct i2c_client *client,
609                              const struct i2c_device_id *id)
610 {
611         struct device *dev = &client->dev;
612         struct tas6424_data *tas6424;
613         int ret;
614         int i;
615 
616         tas6424 = devm_kzalloc(dev, sizeof(*tas6424), GFP_KERNEL);
617         if (!tas6424)
618                 return -ENOMEM;
619         dev_set_drvdata(dev, tas6424);
620 
621         tas6424->dev = dev;
622 
623         tas6424->regmap = devm_regmap_init_i2c(client, &tas6424_regmap_config);
624         if (IS_ERR(tas6424->regmap)) {
625                 ret = PTR_ERR(tas6424->regmap);
626                 dev_err(dev, "unable to allocate register map: %d\n", ret);
627                 return ret;
628         }
629 
630         for (i = 0; i < ARRAY_SIZE(tas6424->supplies); i++)
631                 tas6424->supplies[i].supply = tas6424_supply_names[i];
632         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tas6424->supplies),
633                                       tas6424->supplies);
634         if (ret) {
635                 dev_err(dev, "unable to request supplies: %d\n", ret);
636                 return ret;
637         }
638 
639         ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),
640                                     tas6424->supplies);
641         if (ret) {
642                 dev_err(dev, "unable to enable supplies: %d\n", ret);
643                 return ret;
644         }
645 
646         /* Reset device to establish well-defined startup state */
647         ret = regmap_update_bits(tas6424->regmap, TAS6424_MODE_CTRL,
648                                  TAS6424_RESET, TAS6424_RESET);
649         if (ret) {
650                 dev_err(dev, "unable to reset device: %d\n", ret);
651                 return ret;
652         }
653 
654         INIT_DELAYED_WORK(&tas6424->fault_check_work, tas6424_fault_check_work);
655 
656         ret = devm_snd_soc_register_component(dev, &soc_codec_dev_tas6424,
657                                      tas6424_dai, ARRAY_SIZE(tas6424_dai));
658         if (ret < 0) {
659                 dev_err(dev, "unable to register codec: %d\n", ret);
660                 return ret;
661         }
662 
663         return 0;
664 }
665 
666 static int tas6424_i2c_remove(struct i2c_client *client)
667 {
668         struct device *dev = &client->dev;
669         struct tas6424_data *tas6424 = dev_get_drvdata(dev);
670         int ret;
671 
672         cancel_delayed_work_sync(&tas6424->fault_check_work);
673 
674         ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies),
675                                      tas6424->supplies);
676         if (ret < 0) {
677                 dev_err(dev, "unable to disable supplies: %d\n", ret);
678                 return ret;
679         }
680 
681         return 0;
682 }
683 
684 static const struct i2c_device_id tas6424_i2c_ids[] = {
685         { "tas6424", 0 },
686         { }
687 };
688 MODULE_DEVICE_TABLE(i2c, tas6424_i2c_ids);
689 
690 static struct i2c_driver tas6424_i2c_driver = {
691         .driver = {
692                 .name = "tas6424",
693                 .of_match_table = of_match_ptr(tas6424_of_ids),
694         },
695         .probe = tas6424_i2c_probe,
696         .remove = tas6424_i2c_remove,
697         .id_table = tas6424_i2c_ids,
698 };
699 module_i2c_driver(tas6424_i2c_driver);
700 
701 MODULE_AUTHOR("Andreas Dannenberg <dannenberg@ti.com>");
702 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
703 MODULE_DESCRIPTION("TAS6424 Audio amplifier driver");
704 MODULE_LICENSE("GPL v2");
705 

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