root/sound/soc/atmel/atmel-pdmic.c

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DEFINITIONS

This source file includes following definitions.
  1. atmel_pdmic_dt_init
  2. atmel_pdmic_cpu_dai_startup
  3. atmel_pdmic_cpu_dai_shutdown
  4. atmel_pdmic_cpu_dai_prepare
  5. atmel_pdmic_platform_configure_dma
  6. pdmic_get_mic_volsw
  7. pdmic_put_mic_volsw
  8. atmel_pdmic_component_probe
  9. atmel_pdmic_codec_dai_hw_params
  10. atmel_pdmic_codec_dai_prepare
  11. atmel_pdmic_codec_dai_trigger
  12. atmel_pdmic_asoc_card_init
  13. atmel_pdmic_get_sample_rate
  14. atmel_pdmic_interrupt
  15. atmel_pdmic_probe
  16. atmel_pdmic_remove

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* Atmel PDMIC driver
   3  *
   4  * Copyright (C) 2015 Atmel
   5  *
   6  * Author: Songjun Wu <songjun.wu@atmel.com>
   7  */
   8 
   9 #include <linux/of.h>
  10 #include <linux/clk.h>
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/regmap.h>
  14 #include <sound/core.h>
  15 #include <sound/dmaengine_pcm.h>
  16 #include <sound/pcm_params.h>
  17 #include <sound/tlv.h>
  18 #include "atmel-pdmic.h"
  19 
  20 struct atmel_pdmic_pdata {
  21         u32 mic_min_freq;
  22         u32 mic_max_freq;
  23         s32 mic_offset;
  24         const char *card_name;
  25 };
  26 
  27 struct atmel_pdmic {
  28         dma_addr_t phy_base;
  29         struct regmap *regmap;
  30         struct clk *pclk;
  31         struct clk *gclk;
  32         struct device *dev;
  33         int irq;
  34         struct snd_pcm_substream *substream;
  35         const struct atmel_pdmic_pdata *pdata;
  36 };
  37 
  38 static const struct of_device_id atmel_pdmic_of_match[] = {
  39         {
  40                 .compatible = "atmel,sama5d2-pdmic",
  41         }, {
  42                 /* sentinel */
  43         }
  44 };
  45 MODULE_DEVICE_TABLE(of, atmel_pdmic_of_match);
  46 
  47 #define PDMIC_OFFSET_MAX_VAL    S16_MAX
  48 #define PDMIC_OFFSET_MIN_VAL    S16_MIN
  49 
  50 static struct atmel_pdmic_pdata *atmel_pdmic_dt_init(struct device *dev)
  51 {
  52         struct device_node *np = dev->of_node;
  53         struct atmel_pdmic_pdata *pdata;
  54 
  55         if (!np) {
  56                 dev_err(dev, "device node not found\n");
  57                 return ERR_PTR(-EINVAL);
  58         }
  59 
  60         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
  61         if (!pdata)
  62                 return ERR_PTR(-ENOMEM);
  63 
  64         if (of_property_read_string(np, "atmel,model", &pdata->card_name))
  65                 pdata->card_name = "PDMIC";
  66 
  67         if (of_property_read_u32(np, "atmel,mic-min-freq",
  68                                  &pdata->mic_min_freq)) {
  69                 dev_err(dev, "failed to get mic-min-freq\n");
  70                 return ERR_PTR(-EINVAL);
  71         }
  72 
  73         if (of_property_read_u32(np, "atmel,mic-max-freq",
  74                                  &pdata->mic_max_freq)) {
  75                 dev_err(dev, "failed to get mic-max-freq\n");
  76                 return ERR_PTR(-EINVAL);
  77         }
  78 
  79         if (pdata->mic_max_freq < pdata->mic_min_freq) {
  80                 dev_err(dev,
  81                         "mic-max-freq should not be less than mic-min-freq\n");
  82                 return ERR_PTR(-EINVAL);
  83         }
  84 
  85         if (of_property_read_s32(np, "atmel,mic-offset", &pdata->mic_offset))
  86                 pdata->mic_offset = 0;
  87 
  88         if (pdata->mic_offset > PDMIC_OFFSET_MAX_VAL) {
  89                 dev_warn(dev,
  90                          "mic-offset value %d is larger than the max value %d, the max value is specified\n",
  91                          pdata->mic_offset, PDMIC_OFFSET_MAX_VAL);
  92                 pdata->mic_offset = PDMIC_OFFSET_MAX_VAL;
  93         } else if (pdata->mic_offset < PDMIC_OFFSET_MIN_VAL) {
  94                 dev_warn(dev,
  95                          "mic-offset value %d is less than the min value %d, the min value is specified\n",
  96                          pdata->mic_offset, PDMIC_OFFSET_MIN_VAL);
  97                 pdata->mic_offset = PDMIC_OFFSET_MIN_VAL;
  98         }
  99 
 100         return pdata;
 101 }
 102 
 103 /* cpu dai component */
 104 static int atmel_pdmic_cpu_dai_startup(struct snd_pcm_substream *substream,
 105                                         struct snd_soc_dai *cpu_dai)
 106 {
 107         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 108         struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
 109         int ret;
 110 
 111         ret = clk_prepare_enable(dd->gclk);
 112         if (ret)
 113                 return ret;
 114 
 115         ret =  clk_prepare_enable(dd->pclk);
 116         if (ret) {
 117                 clk_disable_unprepare(dd->gclk);
 118                 return ret;
 119         }
 120 
 121         /* Clear all bits in the Control Register(PDMIC_CR) */
 122         regmap_write(dd->regmap, PDMIC_CR, 0);
 123 
 124         dd->substream = substream;
 125 
 126         /* Enable the overrun error interrupt */
 127         regmap_write(dd->regmap, PDMIC_IER, PDMIC_IER_OVRE);
 128 
 129         return 0;
 130 }
 131 
 132 static void atmel_pdmic_cpu_dai_shutdown(struct snd_pcm_substream *substream,
 133                                         struct snd_soc_dai *cpu_dai)
 134 {
 135         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 136         struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
 137 
 138         /* Disable the overrun error interrupt */
 139         regmap_write(dd->regmap, PDMIC_IDR, PDMIC_IDR_OVRE);
 140 
 141         clk_disable_unprepare(dd->gclk);
 142         clk_disable_unprepare(dd->pclk);
 143 }
 144 
 145 static int atmel_pdmic_cpu_dai_prepare(struct snd_pcm_substream *substream,
 146                                         struct snd_soc_dai *cpu_dai)
 147 {
 148         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 149         struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
 150         u32 val;
 151 
 152         /* Clean the PDMIC Converted Data Register */
 153         return regmap_read(dd->regmap, PDMIC_CDR, &val);
 154 }
 155 
 156 static const struct snd_soc_dai_ops atmel_pdmic_cpu_dai_ops = {
 157         .startup        = atmel_pdmic_cpu_dai_startup,
 158         .shutdown       = atmel_pdmic_cpu_dai_shutdown,
 159         .prepare        = atmel_pdmic_cpu_dai_prepare,
 160 };
 161 
 162 #define ATMEL_PDMIC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
 163 
 164 static struct snd_soc_dai_driver atmel_pdmic_cpu_dai = {
 165         .capture = {
 166                 .channels_min   = 1,
 167                 .channels_max   = 1,
 168                 .rates          = SNDRV_PCM_RATE_KNOT,
 169                 .formats        = ATMEL_PDMIC_FORMATS,},
 170         .ops = &atmel_pdmic_cpu_dai_ops,
 171 };
 172 
 173 static const struct snd_soc_component_driver atmel_pdmic_cpu_dai_component = {
 174         .name = "atmel-pdmic",
 175 };
 176 
 177 /* platform */
 178 #define ATMEL_PDMIC_MAX_BUF_SIZE  (64 * 1024)
 179 #define ATMEL_PDMIC_PREALLOC_BUF_SIZE  ATMEL_PDMIC_MAX_BUF_SIZE
 180 
 181 static const struct snd_pcm_hardware atmel_pdmic_hw = {
 182         .info                   = SNDRV_PCM_INFO_MMAP
 183                                 | SNDRV_PCM_INFO_MMAP_VALID
 184                                 | SNDRV_PCM_INFO_INTERLEAVED
 185                                 | SNDRV_PCM_INFO_RESUME
 186                                 | SNDRV_PCM_INFO_PAUSE,
 187         .formats                = ATMEL_PDMIC_FORMATS,
 188         .buffer_bytes_max       = ATMEL_PDMIC_MAX_BUF_SIZE,
 189         .period_bytes_min       = 256,
 190         .period_bytes_max       = 32 * 1024,
 191         .periods_min            = 2,
 192         .periods_max            = 256,
 193 };
 194 
 195 static int
 196 atmel_pdmic_platform_configure_dma(struct snd_pcm_substream *substream,
 197                                 struct snd_pcm_hw_params *params,
 198                                 struct dma_slave_config *slave_config)
 199 {
 200         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 201         struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
 202         int ret;
 203 
 204         ret = snd_hwparams_to_dma_slave_config(substream, params,
 205                                                slave_config);
 206         if (ret) {
 207                 dev_err(dd->dev,
 208                         "hw params to dma slave configure failed\n");
 209                 return ret;
 210         }
 211 
 212         slave_config->src_addr          = dd->phy_base + PDMIC_CDR;
 213         slave_config->src_maxburst      = 1;
 214         slave_config->dst_maxburst      = 1;
 215 
 216         return 0;
 217 }
 218 
 219 static const struct snd_dmaengine_pcm_config
 220 atmel_pdmic_dmaengine_pcm_config = {
 221         .prepare_slave_config   = atmel_pdmic_platform_configure_dma,
 222         .pcm_hardware           = &atmel_pdmic_hw,
 223         .prealloc_buffer_size   = ATMEL_PDMIC_PREALLOC_BUF_SIZE,
 224 };
 225 
 226 /* codec */
 227 /* Mic Gain = dgain * 2^(-scale) */
 228 struct mic_gain {
 229         unsigned int dgain;
 230         unsigned int scale;
 231 };
 232 
 233 /* range from -90 dB to 90 dB */
 234 static const struct mic_gain mic_gain_table[] = {
 235 {    1, 15}, {    1, 14},                           /* -90, -84 dB */
 236 {    3, 15}, {    1, 13}, {    3, 14}, {    1, 12}, /* -81, -78, -75, -72 dB */
 237 {    5, 14}, {   13, 15},                           /* -70, -68 dB */
 238 {    9, 14}, {   21, 15}, {   23, 15}, {   13, 14}, /* -65 ~ -62 dB */
 239 {   29, 15}, {   33, 15}, {   37, 15}, {   41, 15}, /* -61 ~ -58 dB */
 240 {   23, 14}, {   13, 13}, {   58, 15}, {   65, 15}, /* -57 ~ -54 dB */
 241 {   73, 15}, {   41, 14}, {   23, 13}, {   13, 12}, /* -53 ~ -50 dB */
 242 {   29, 13}, {   65, 14}, {   73, 14}, {   41, 13}, /* -49 ~ -46 dB */
 243 {   23, 12}, {  207, 15}, {   29, 12}, {   65, 13}, /* -45 ~ -42 dB */
 244 {   73, 13}, {   41, 12}, {   23, 11}, {  413, 15}, /* -41 ~ -38 dB */
 245 {  463, 15}, {  519, 15}, {  583, 15}, {  327, 14}, /* -37 ~ -34 dB */
 246 {  367, 14}, {  823, 15}, {  231, 13}, { 1036, 15}, /* -33 ~ -30 dB */
 247 { 1163, 15}, { 1305, 15}, {  183, 12}, { 1642, 15}, /* -29 ~ -26 dB */
 248 { 1843, 15}, { 2068, 15}, {  145, 11}, { 2603, 15}, /* -25 ~ -22 dB */
 249 {  365, 12}, { 3277, 15}, { 3677, 15}, { 4125, 15}, /* -21 ~ -18 dB */
 250 { 4629, 15}, { 5193, 15}, { 5827, 15}, { 3269, 14}, /* -17 ~ -14 dB */
 251 {  917, 12}, { 8231, 15}, { 9235, 15}, { 5181, 14}, /* -13 ~ -10 dB */
 252 {11627, 15}, {13045, 15}, {14637, 15}, {16423, 15}, /*  -9 ~ -6 dB */
 253 {18427, 15}, {20675, 15}, { 5799, 13}, {26029, 15}, /*  -5 ~ -2 dB */
 254 { 7301, 13}, {    1,  0}, {18383, 14}, {10313, 13}, /*  -1 ~ 2 dB */
 255 {23143, 14}, {25967, 14}, {29135, 14}, {16345, 13}, /*   3 ~ 6 dB */
 256 { 4585, 11}, {20577, 13}, { 1443,  9}, {25905, 13}, /*   7 ~ 10 dB */
 257 {14533, 12}, { 8153, 11}, { 2287,  9}, {20529, 12}, /*  11 ~ 14 dB */
 258 {11517, 11}, { 6461, 10}, {28997, 12}, { 4067,  9}, /*  15 ~ 18 dB */
 259 {18253, 11}, {   10,  0}, {22979, 11}, {25783, 11}, /*  19 ~ 22 dB */
 260 {28929, 11}, {32459, 11}, { 9105,  9}, {20431, 10}, /*  23 ~ 26 dB */
 261 {22925, 10}, {12861,  9}, { 7215,  8}, {16191,  9}, /*  27 ~ 30 dB */
 262 { 9083,  8}, {20383,  9}, {11435,  8}, { 6145,  7}, /*  31 ~ 34 dB */
 263 { 3599,  6}, {32305,  9}, {18123,  8}, {20335,  8}, /*  35 ~ 38 dB */
 264 {  713,  3}, {  100,  0}, { 7181,  6}, { 8057,  6}, /*  39 ~ 42 dB */
 265 {  565,  2}, {20287,  7}, {11381,  6}, {25539,  7}, /*  43 ~ 46 dB */
 266 { 1791,  3}, { 4019,  4}, { 9019,  5}, {20239,  6}, /*  47 ~ 50 dB */
 267 { 5677,  4}, {25479,  6}, { 7147,  4}, { 8019,  4}, /*  51 ~ 54 dB */
 268 {17995,  5}, {20191,  5}, {11327,  4}, {12709,  4}, /*  55 ~ 58 dB */
 269 { 3565,  2}, { 1000,  0}, { 1122,  0}, { 1259,  0}, /*  59 ~ 62 dB */
 270 { 2825,  1}, {12679,  3}, { 7113,  2}, { 7981,  2}, /*  63 ~ 66 dB */
 271 { 8955,  2}, {20095,  3}, {22547,  3}, {12649,  2}, /*  67 ~ 70 dB */
 272 {28385,  3}, { 3981,  0}, {17867,  2}, {20047,  2}, /*  71 ~ 74 dB */
 273 {11247,  1}, {12619,  1}, {14159,  1}, {31773,  2}, /*  75 ~ 78 dB */
 274 {17825,  1}, {10000,  0}, {11220,  0}, {12589,  0}, /*  79 ~ 82 dB */
 275 {28251,  1}, {15849,  0}, {17783,  0}, {19953,  0}, /*  83 ~ 86 dB */
 276 {22387,  0}, {25119,  0}, {28184,  0}, {31623,  0}, /*  87 ~ 90 dB */
 277 };
 278 
 279 static const DECLARE_TLV_DB_RANGE(mic_gain_tlv,
 280         0, 1, TLV_DB_SCALE_ITEM(-9000, 600, 0),
 281         2, 5, TLV_DB_SCALE_ITEM(-8100, 300, 0),
 282         6, 7, TLV_DB_SCALE_ITEM(-7000, 200, 0),
 283         8, ARRAY_SIZE(mic_gain_table)-1, TLV_DB_SCALE_ITEM(-6500, 100, 0),
 284 );
 285 
 286 static int pdmic_get_mic_volsw(struct snd_kcontrol *kcontrol,
 287         struct snd_ctl_elem_value *ucontrol)
 288 {
 289         struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
 290         unsigned int dgain_val, scale_val;
 291         int i;
 292 
 293         dgain_val = (snd_soc_component_read32(component, PDMIC_DSPR1) & PDMIC_DSPR1_DGAIN_MASK)
 294                     >> PDMIC_DSPR1_DGAIN_SHIFT;
 295 
 296         scale_val = (snd_soc_component_read32(component, PDMIC_DSPR0) & PDMIC_DSPR0_SCALE_MASK)
 297                     >> PDMIC_DSPR0_SCALE_SHIFT;
 298 
 299         for (i = 0; i < ARRAY_SIZE(mic_gain_table); i++) {
 300                 if ((mic_gain_table[i].dgain == dgain_val) &&
 301                     (mic_gain_table[i].scale == scale_val))
 302                         ucontrol->value.integer.value[0] = i;
 303         }
 304 
 305         return 0;
 306 }
 307 
 308 static int pdmic_put_mic_volsw(struct snd_kcontrol *kcontrol,
 309         struct snd_ctl_elem_value *ucontrol)
 310 {
 311         struct soc_mixer_control *mc =
 312                 (struct soc_mixer_control *)kcontrol->private_value;
 313         struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
 314         int max = mc->max;
 315         unsigned int val;
 316         int ret;
 317 
 318         val = ucontrol->value.integer.value[0];
 319 
 320         if (val > max)
 321                 return -EINVAL;
 322 
 323         ret = snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_MASK,
 324                          mic_gain_table[val].dgain << PDMIC_DSPR1_DGAIN_SHIFT);
 325         if (ret < 0)
 326                 return ret;
 327 
 328         ret = snd_soc_component_update_bits(component, PDMIC_DSPR0, PDMIC_DSPR0_SCALE_MASK,
 329                          mic_gain_table[val].scale << PDMIC_DSPR0_SCALE_SHIFT);
 330         if (ret < 0)
 331                 return ret;
 332 
 333         return 0;
 334 }
 335 
 336 static const struct snd_kcontrol_new atmel_pdmic_snd_controls[] = {
 337 SOC_SINGLE_EXT_TLV("Mic Capture Volume", PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_SHIFT,
 338                    ARRAY_SIZE(mic_gain_table)-1, 0,
 339                    pdmic_get_mic_volsw, pdmic_put_mic_volsw, mic_gain_tlv),
 340 
 341 SOC_SINGLE("High Pass Filter Switch", PDMIC_DSPR0,
 342            PDMIC_DSPR0_HPFBYP_SHIFT, 1, 1),
 343 
 344 SOC_SINGLE("SINCC Filter Switch", PDMIC_DSPR0, PDMIC_DSPR0_SINBYP_SHIFT, 1, 1),
 345 };
 346 
 347 static int atmel_pdmic_component_probe(struct snd_soc_component *component)
 348 {
 349         struct snd_soc_card *card = snd_soc_component_get_drvdata(component);
 350         struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card);
 351 
 352         snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_OFFSET_MASK,
 353                      (u32)(dd->pdata->mic_offset << PDMIC_DSPR1_OFFSET_SHIFT));
 354 
 355         return 0;
 356 }
 357 
 358 static struct snd_soc_component_driver soc_component_dev_pdmic = {
 359         .probe                  = atmel_pdmic_component_probe,
 360         .controls               = atmel_pdmic_snd_controls,
 361         .num_controls           = ARRAY_SIZE(atmel_pdmic_snd_controls),
 362         .idle_bias_on           = 1,
 363         .use_pmdown_time        = 1,
 364         .endianness             = 1,
 365         .non_legacy_dai_naming  = 1,
 366 };
 367 
 368 /* codec dai component */
 369 #define PDMIC_MR_PRESCAL_MAX_VAL 127
 370 
 371 static int
 372 atmel_pdmic_codec_dai_hw_params(struct snd_pcm_substream *substream,
 373                             struct snd_pcm_hw_params *params,
 374                             struct snd_soc_dai *codec_dai)
 375 {
 376         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 377         struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
 378         struct snd_soc_component *component = codec_dai->component;
 379         unsigned int rate_min = substream->runtime->hw.rate_min;
 380         unsigned int rate_max = substream->runtime->hw.rate_max;
 381         int fs = params_rate(params);
 382         int bits = params_width(params);
 383         unsigned long pclk_rate, gclk_rate;
 384         unsigned int f_pdmic;
 385         u32 mr_val, dspr0_val, pclk_prescal, gclk_prescal;
 386 
 387         if (params_channels(params) != 1) {
 388                 dev_err(component->dev,
 389                         "only supports one channel\n");
 390                 return -EINVAL;
 391         }
 392 
 393         if ((fs < rate_min) || (fs > rate_max)) {
 394                 dev_err(component->dev,
 395                         "sample rate is %dHz, min rate is %dHz, max rate is %dHz\n",
 396                         fs, rate_min, rate_max);
 397 
 398                 return -EINVAL;
 399         }
 400 
 401         switch (bits) {
 402         case 16:
 403                 dspr0_val = (PDMIC_DSPR0_SIZE_16_BITS
 404                              << PDMIC_DSPR0_SIZE_SHIFT);
 405                 break;
 406         case 32:
 407                 dspr0_val = (PDMIC_DSPR0_SIZE_32_BITS
 408                              << PDMIC_DSPR0_SIZE_SHIFT);
 409                 break;
 410         default:
 411                 return -EINVAL;
 412         }
 413 
 414         if ((fs << 7) > (rate_max << 6)) {
 415                 f_pdmic = fs << 6;
 416                 dspr0_val |= PDMIC_DSPR0_OSR_64 << PDMIC_DSPR0_OSR_SHIFT;
 417         } else {
 418                 f_pdmic = fs << 7;
 419                 dspr0_val |= PDMIC_DSPR0_OSR_128 << PDMIC_DSPR0_OSR_SHIFT;
 420         }
 421 
 422         pclk_rate = clk_get_rate(dd->pclk);
 423         gclk_rate = clk_get_rate(dd->gclk);
 424 
 425         /* PRESCAL = SELCK/(2*f_pdmic) - 1*/
 426         pclk_prescal = (u32)(pclk_rate/(f_pdmic << 1)) - 1;
 427         gclk_prescal = (u32)(gclk_rate/(f_pdmic << 1)) - 1;
 428 
 429         if ((pclk_prescal > PDMIC_MR_PRESCAL_MAX_VAL) ||
 430             (gclk_rate/((gclk_prescal + 1) << 1) <
 431              pclk_rate/((pclk_prescal + 1) << 1))) {
 432                 mr_val = gclk_prescal << PDMIC_MR_PRESCAL_SHIFT;
 433                 mr_val |= PDMIC_MR_CLKS_GCK << PDMIC_MR_CLKS_SHIFT;
 434         } else {
 435                 mr_val = pclk_prescal << PDMIC_MR_PRESCAL_SHIFT;
 436                 mr_val |= PDMIC_MR_CLKS_PCK << PDMIC_MR_CLKS_SHIFT;
 437         }
 438 
 439         snd_soc_component_update_bits(component, PDMIC_MR,
 440                 PDMIC_MR_PRESCAL_MASK | PDMIC_MR_CLKS_MASK, mr_val);
 441 
 442         snd_soc_component_update_bits(component, PDMIC_DSPR0,
 443                 PDMIC_DSPR0_OSR_MASK | PDMIC_DSPR0_SIZE_MASK, dspr0_val);
 444 
 445         return 0;
 446 }
 447 
 448 static int atmel_pdmic_codec_dai_prepare(struct snd_pcm_substream *substream,
 449                                         struct snd_soc_dai *codec_dai)
 450 {
 451         struct snd_soc_component *component = codec_dai->component;
 452 
 453         snd_soc_component_update_bits(component, PDMIC_CR, PDMIC_CR_ENPDM_MASK,
 454                             PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);
 455 
 456         return 0;
 457 }
 458 
 459 static int atmel_pdmic_codec_dai_trigger(struct snd_pcm_substream *substream,
 460                                         int cmd, struct snd_soc_dai *codec_dai)
 461 {
 462         struct snd_soc_component *component = codec_dai->component;
 463         u32 val;
 464 
 465         switch (cmd) {
 466         case SNDRV_PCM_TRIGGER_START:
 467         case SNDRV_PCM_TRIGGER_RESUME:
 468         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 469                 val = PDMIC_CR_ENPDM_EN << PDMIC_CR_ENPDM_SHIFT;
 470                 break;
 471         case SNDRV_PCM_TRIGGER_STOP:
 472         case SNDRV_PCM_TRIGGER_SUSPEND:
 473         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 474                 val = PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT;
 475                 break;
 476         default:
 477                 return -EINVAL;
 478         }
 479 
 480         snd_soc_component_update_bits(component, PDMIC_CR, PDMIC_CR_ENPDM_MASK, val);
 481 
 482         return 0;
 483 }
 484 
 485 static const struct snd_soc_dai_ops atmel_pdmic_codec_dai_ops = {
 486         .hw_params      = atmel_pdmic_codec_dai_hw_params,
 487         .prepare        = atmel_pdmic_codec_dai_prepare,
 488         .trigger        = atmel_pdmic_codec_dai_trigger,
 489 };
 490 
 491 #define ATMEL_PDMIC_CODEC_DAI_NAME  "atmel-pdmic-hifi"
 492 
 493 static struct snd_soc_dai_driver atmel_pdmic_codec_dai = {
 494         .name = ATMEL_PDMIC_CODEC_DAI_NAME,
 495         .capture = {
 496                 .stream_name    = "Capture",
 497                 .channels_min   = 1,
 498                 .channels_max   = 1,
 499                 .rates          = SNDRV_PCM_RATE_KNOT,
 500                 .formats        = ATMEL_PDMIC_FORMATS,
 501         },
 502         .ops = &atmel_pdmic_codec_dai_ops,
 503 };
 504 
 505 /* ASoC sound card */
 506 static int atmel_pdmic_asoc_card_init(struct device *dev,
 507                                 struct snd_soc_card *card)
 508 {
 509         struct snd_soc_dai_link *dai_link;
 510         struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card);
 511         struct snd_soc_dai_link_component *comp;
 512 
 513         dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
 514         if (!dai_link)
 515                 return -ENOMEM;
 516 
 517         comp = devm_kzalloc(dev, 3 * sizeof(*comp), GFP_KERNEL);
 518         if (!comp)
 519                 return -ENOMEM;
 520 
 521         dai_link->cpus          = &comp[0];
 522         dai_link->codecs        = &comp[1];
 523         dai_link->platforms     = &comp[2];
 524 
 525         dai_link->num_cpus      = 1;
 526         dai_link->num_codecs    = 1;
 527         dai_link->num_platforms = 1;
 528 
 529         dai_link->name                  = "PDMIC";
 530         dai_link->stream_name           = "PDMIC PCM";
 531         dai_link->codecs->dai_name      = ATMEL_PDMIC_CODEC_DAI_NAME;
 532         dai_link->cpus->dai_name        = dev_name(dev);
 533         dai_link->codecs->name          = dev_name(dev);
 534         dai_link->platforms->name       = dev_name(dev);
 535 
 536         card->dai_link  = dai_link;
 537         card->num_links = 1;
 538         card->name      = dd->pdata->card_name;
 539         card->dev       = dev;
 540 
 541         return 0;
 542 }
 543 
 544 static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd,
 545         unsigned int *rate_min, unsigned int *rate_max)
 546 {
 547         u32 mic_min_freq = dd->pdata->mic_min_freq;
 548         u32 mic_max_freq = dd->pdata->mic_max_freq;
 549         u32 clk_max_rate = (u32)(clk_get_rate(dd->pclk) >> 1);
 550         u32 clk_min_rate = (u32)(clk_get_rate(dd->gclk) >> 8);
 551 
 552         if (mic_max_freq > clk_max_rate)
 553                 mic_max_freq = clk_max_rate;
 554 
 555         if (mic_min_freq < clk_min_rate)
 556                 mic_min_freq = clk_min_rate;
 557 
 558         *rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128);
 559         *rate_max = mic_max_freq >> 6;
 560 }
 561 
 562 /* PDMIC interrupt handler */
 563 static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id)
 564 {
 565         struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id;
 566         u32 pdmic_isr;
 567         irqreturn_t ret = IRQ_NONE;
 568 
 569         regmap_read(dd->regmap, PDMIC_ISR, &pdmic_isr);
 570 
 571         if (pdmic_isr & PDMIC_ISR_OVRE) {
 572                 regmap_update_bits(dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK,
 573                                    PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);
 574 
 575                 snd_pcm_stop_xrun(dd->substream);
 576 
 577                 ret = IRQ_HANDLED;
 578         }
 579 
 580         return ret;
 581 }
 582 
 583 /* regmap configuration */
 584 #define ATMEL_PDMIC_REG_MAX    0x124
 585 static const struct regmap_config atmel_pdmic_regmap_config = {
 586         .reg_bits       = 32,
 587         .reg_stride     = 4,
 588         .val_bits       = 32,
 589         .max_register   = ATMEL_PDMIC_REG_MAX,
 590 };
 591 
 592 static int atmel_pdmic_probe(struct platform_device *pdev)
 593 {
 594         struct device *dev = &pdev->dev;
 595         struct atmel_pdmic *dd;
 596         struct resource *res;
 597         void __iomem *io_base;
 598         const struct atmel_pdmic_pdata *pdata;
 599         struct snd_soc_card *card;
 600         unsigned int rate_min, rate_max;
 601         int ret;
 602 
 603         pdata = atmel_pdmic_dt_init(dev);
 604         if (IS_ERR(pdata))
 605                 return PTR_ERR(pdata);
 606 
 607         dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
 608         if (!dd)
 609                 return -ENOMEM;
 610 
 611         dd->pdata = pdata;
 612         dd->dev = dev;
 613 
 614         dd->irq = platform_get_irq(pdev, 0);
 615         if (dd->irq < 0)
 616                 return dd->irq;
 617 
 618         dd->pclk = devm_clk_get(dev, "pclk");
 619         if (IS_ERR(dd->pclk)) {
 620                 ret = PTR_ERR(dd->pclk);
 621                 dev_err(dev, "failed to get peripheral clock: %d\n", ret);
 622                 return ret;
 623         }
 624 
 625         dd->gclk = devm_clk_get(dev, "gclk");
 626         if (IS_ERR(dd->gclk)) {
 627                 ret = PTR_ERR(dd->gclk);
 628                 dev_err(dev, "failed to get GCK: %d\n", ret);
 629                 return ret;
 630         }
 631 
 632         /* The gclk clock frequency must always be three times
 633          * lower than the pclk clock frequency
 634          */
 635         ret = clk_set_rate(dd->gclk, clk_get_rate(dd->pclk)/3);
 636         if (ret) {
 637                 dev_err(dev, "failed to set GCK clock rate: %d\n", ret);
 638                 return ret;
 639         }
 640 
 641         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 642         io_base = devm_ioremap_resource(dev, res);
 643         if (IS_ERR(io_base))
 644                 return PTR_ERR(io_base);
 645 
 646         dd->phy_base = res->start;
 647 
 648         dd->regmap = devm_regmap_init_mmio(dev, io_base,
 649                                            &atmel_pdmic_regmap_config);
 650         if (IS_ERR(dd->regmap)) {
 651                 ret = PTR_ERR(dd->regmap);
 652                 dev_err(dev, "failed to init register map: %d\n", ret);
 653                 return ret;
 654         }
 655 
 656         ret =  devm_request_irq(dev, dd->irq, atmel_pdmic_interrupt, 0,
 657                                 "PDMIC", (void *)dd);
 658         if (ret < 0) {
 659                 dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
 660                         dd->irq, ret);
 661                 return ret;
 662         }
 663 
 664         /* Get the minimal and maximal sample rate that the microphone supports */
 665         atmel_pdmic_get_sample_rate(dd, &rate_min, &rate_max);
 666 
 667         /* register cpu dai */
 668         atmel_pdmic_cpu_dai.capture.rate_min = rate_min;
 669         atmel_pdmic_cpu_dai.capture.rate_max = rate_max;
 670         ret = devm_snd_soc_register_component(dev,
 671                                               &atmel_pdmic_cpu_dai_component,
 672                                               &atmel_pdmic_cpu_dai, 1);
 673         if (ret) {
 674                 dev_err(dev, "could not register CPU DAI: %d\n", ret);
 675                 return ret;
 676         }
 677 
 678         /* register platform */
 679         ret = devm_snd_dmaengine_pcm_register(dev,
 680                                              &atmel_pdmic_dmaengine_pcm_config,
 681                                              0);
 682         if (ret) {
 683                 dev_err(dev, "could not register platform: %d\n", ret);
 684                 return ret;
 685         }
 686 
 687         /* register codec and codec dai */
 688         atmel_pdmic_codec_dai.capture.rate_min = rate_min;
 689         atmel_pdmic_codec_dai.capture.rate_max = rate_max;
 690         ret = devm_snd_soc_register_component(dev, &soc_component_dev_pdmic,
 691                                      &atmel_pdmic_codec_dai, 1);
 692         if (ret) {
 693                 dev_err(dev, "could not register component: %d\n", ret);
 694                 return ret;
 695         }
 696 
 697         /* register sound card */
 698         card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
 699         if (!card) {
 700                 ret = -ENOMEM;
 701                 goto unregister_codec;
 702         }
 703 
 704         snd_soc_card_set_drvdata(card, dd);
 705 
 706         ret = atmel_pdmic_asoc_card_init(dev, card);
 707         if (ret) {
 708                 dev_err(dev, "failed to init sound card: %d\n", ret);
 709                 goto unregister_codec;
 710         }
 711 
 712         ret = devm_snd_soc_register_card(dev, card);
 713         if (ret) {
 714                 dev_err(dev, "failed to register sound card: %d\n", ret);
 715                 goto unregister_codec;
 716         }
 717 
 718         return 0;
 719 
 720 unregister_codec:
 721         return ret;
 722 }
 723 
 724 static int atmel_pdmic_remove(struct platform_device *pdev)
 725 {
 726         return 0;
 727 }
 728 
 729 static struct platform_driver atmel_pdmic_driver = {
 730         .driver = {
 731                 .name           = "atmel-pdmic",
 732                 .of_match_table = of_match_ptr(atmel_pdmic_of_match),
 733                 .pm             = &snd_soc_pm_ops,
 734         },
 735         .probe  = atmel_pdmic_probe,
 736         .remove = atmel_pdmic_remove,
 737 };
 738 module_platform_driver(atmel_pdmic_driver);
 739 
 740 MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture");
 741 MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
 742 MODULE_LICENSE("GPL v2");

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