sound/soc/codecs/rt5514-spi.c

   1 /*
   2  * rt5514-spi.c  --  RT5514 SPI driver
   3  *
   4  * Copyright 2015 Realtek Semiconductor Corp.
   5  * Author: Oder Chiou <oder_chiou@realtek.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/input.h>
  14 #include <linux/spi/spi.h>
  15 #include <linux/device.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/irq.h>
  20 #include <linux/slab.h>
  21 #include <linux/gpio.h>
  22 #include <linux/sched.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/regulator/consumer.h>
  25 #include <linux/pm_qos.h>
  26 #include <linux/sysfs.h>
  27 #include <linux/clk.h>
  28 #include <sound/core.h>
  29 #include <sound/pcm.h>
  30 #include <sound/pcm_params.h>
  31 #include <sound/soc.h>
  32 #include <sound/soc-dapm.h>
  33 #include <sound/initval.h>
  34 #include <sound/tlv.h>
  35
  36 #include "rt5514-spi.h"
  37
  38 #define DRV_NAME "rt5514-spi"
  39
  40 static struct spi_device *rt5514_spi;
  41
  42 struct rt5514_dsp {
  43         struct device *dev;
  44         struct delayed_work copy_work;
  45         struct mutex dma_lock;
  46         struct snd_pcm_substream *substream;
  47         unsigned int buf_base, buf_limit, buf_rp;
  48         size_t buf_size, get_size, dma_offset;
  49 };
  50
  51 static const struct snd_pcm_hardware rt5514_spi_pcm_hardware = {
  52         .info                   = SNDRV_PCM_INFO_MMAP |
  53                                   SNDRV_PCM_INFO_MMAP_VALID |
  54                                   SNDRV_PCM_INFO_INTERLEAVED,
  55         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
  56         .period_bytes_min       = PAGE_SIZE,
  57         .period_bytes_max       = 0x20000 / 8,
  58         .periods_min            = 8,
  59         .periods_max            = 8,
  60         .channels_min           = 1,
  61         .channels_max           = 1,
  62         .buffer_bytes_max       = 0x20000,
  63 };
  64
  65 static struct snd_soc_dai_driver rt5514_spi_dai = {
  66         .name = "rt5514-dsp-cpu-dai",
  67         .id = 0,
  68         .capture = {
  69                 .stream_name = "DSP Capture",
  70                 .channels_min = 1,
  71                 .channels_max = 1,
  72                 .rates = SNDRV_PCM_RATE_16000,
  73                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
  74         },
  75 };
  76
  77 static void rt5514_spi_copy_work(struct work_struct *work)
  78 {
  79         struct rt5514_dsp *rt5514_dsp =
  80                 container_of(work, struct rt5514_dsp, copy_work.work);
  81         struct snd_pcm_runtime *runtime;
  82         size_t period_bytes, truncated_bytes = 0;
  83         unsigned int cur_wp, remain_data;
  84         u8 buf[8];
  85
  86         mutex_lock(&rt5514_dsp->dma_lock);
  87         if (!rt5514_dsp->substream) {
  88                 dev_err(rt5514_dsp->dev, "No pcm substream\n");
  89                 goto done;
  90         }
  91
  92         runtime = rt5514_dsp->substream->runtime;
  93         period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream);
  94         if (!period_bytes) {
  95                 schedule_delayed_work(&rt5514_dsp->copy_work, 5);
  96                 goto done;
  97         }
  98
  99         if (rt5514_dsp->buf_size % period_bytes)
 100                 rt5514_dsp->buf_size = (rt5514_dsp->buf_size / period_bytes) *
 101                         period_bytes;
 102
 103         if (rt5514_dsp->get_size >= rt5514_dsp->buf_size) {
 104                 rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
 105                         sizeof(buf));
 106                 cur_wp = buf[0] | buf[1] << 8 | buf[2] << 16 |
 107                                         buf[3] << 24;
 108
 109                 if (cur_wp >= rt5514_dsp->buf_rp)
 110                         remain_data = (cur_wp - rt5514_dsp->buf_rp);
 111                 else
 112                         remain_data =
 113                                 (rt5514_dsp->buf_limit - rt5514_dsp->buf_rp) +
 114                                 (cur_wp - rt5514_dsp->buf_base);
 115
 116                 if (remain_data < period_bytes) {
 117                         schedule_delayed_work(&rt5514_dsp->copy_work, 5);
 118                         goto done;
 119                 }
 120         }
 121
 122         if (rt5514_dsp->buf_rp + period_bytes <= rt5514_dsp->buf_limit) {
 123                 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
 124                         runtime->dma_area + rt5514_dsp->dma_offset,
 125                         period_bytes);
 126
 127                 if (rt5514_dsp->buf_rp + period_bytes == rt5514_dsp->buf_limit)
 128                         rt5514_dsp->buf_rp = rt5514_dsp->buf_base;
 129                 else
 130                         rt5514_dsp->buf_rp += period_bytes;
 131         } else {
 132                 truncated_bytes = rt5514_dsp->buf_limit - rt5514_dsp->buf_rp;
 133                 rt5514_spi_burst_read(rt5514_dsp->buf_rp,
 134                         runtime->dma_area + rt5514_dsp->dma_offset,
 135                         truncated_bytes);
 136
 137                 rt5514_spi_burst_read(rt5514_dsp->buf_base,
 138                         runtime->dma_area + rt5514_dsp->dma_offset +
 139                         truncated_bytes, period_bytes - truncated_bytes);
 140
 141                 rt5514_dsp->buf_rp = rt5514_dsp->buf_base + period_bytes -
 142                         truncated_bytes;
 143         }
 144
 145         rt5514_dsp->get_size += period_bytes;
 146         rt5514_dsp->dma_offset += period_bytes;
 147         if (rt5514_dsp->dma_offset >= runtime->dma_bytes)
 148                 rt5514_dsp->dma_offset = 0;
 149
 150         snd_pcm_period_elapsed(rt5514_dsp->substream);
 151
 152         schedule_delayed_work(&rt5514_dsp->copy_work, 5);
 153
 154 done:
 155         mutex_unlock(&rt5514_dsp->dma_lock);
 156 }
 157
 158 static void rt5514_schedule_copy(struct rt5514_dsp *rt5514_dsp)
 159 {
 160         u8 buf[8];
 161
 162         if (!rt5514_dsp->substream)
 163                 return;
 164
 165         rt5514_dsp->get_size = 0;
 166
 167         /**
 168          * The address area x1800XXXX is the register address, and it cannot
 169          * support spi burst read perfectly. So we use the spi burst read
 170          * individually to make sure the data correctly.
 171          */
 172         rt5514_spi_burst_read(RT5514_BUFFER_VOICE_BASE, (u8 *)&buf,
 173                 sizeof(buf));
 174         rt5514_dsp->buf_base = buf[0] | buf[1] << 8 | buf[2] << 16 |
 175                                 buf[3] << 24;
 176
 177         rt5514_spi_burst_read(RT5514_BUFFER_VOICE_LIMIT, (u8 *)&buf,
 178                 sizeof(buf));
 179         rt5514_dsp->buf_limit = buf[0] | buf[1] << 8 | buf[2] << 16 |
 180                                 buf[3] << 24;
 181
 182         rt5514_spi_burst_read(RT5514_BUFFER_VOICE_WP, (u8 *)&buf,
 183                 sizeof(buf));
 184         rt5514_dsp->buf_rp = buf[0] | buf[1] << 8 | buf[2] << 16 |
 185                                 buf[3] << 24;
 186
 187         if (rt5514_dsp->buf_rp % 8)
 188                 rt5514_dsp->buf_rp = (rt5514_dsp->buf_rp / 8) * 8;
 189
 190         rt5514_dsp->buf_size = rt5514_dsp->buf_limit - rt5514_dsp->buf_base;
 191
 192         if (rt5514_dsp->buf_base && rt5514_dsp->buf_limit &&
 193                 rt5514_dsp->buf_rp && rt5514_dsp->buf_size)
 194                 schedule_delayed_work(&rt5514_dsp->copy_work, 0);
 195 }
 196
 197 static irqreturn_t rt5514_spi_irq(int irq, void *data)
 198 {
 199         struct rt5514_dsp *rt5514_dsp = data;
 200
 201         rt5514_schedule_copy(rt5514_dsp);
 202
 203         return IRQ_HANDLED;
 204 }
 205
 206 /* PCM for streaming audio from the DSP buffer */
 207 static int rt5514_spi_pcm_open(struct snd_pcm_substream *substream)
 208 {
 209         snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware);
 210
 211         return 0;
 212 }
 213
 214 static int rt5514_spi_hw_params(struct snd_pcm_substream *substream,
 215                                struct snd_pcm_hw_params *hw_params)
 216 {
 217         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 218         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 219         struct rt5514_dsp *rt5514_dsp =
 220                 snd_soc_component_get_drvdata(component);
 221         int ret;
 222         u8 buf[8];
 223
 224         mutex_lock(&rt5514_dsp->dma_lock);
 225         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 226                         params_buffer_bytes(hw_params));
 227         rt5514_dsp->substream = substream;
 228         rt5514_dsp->dma_offset = 0;
 229
 230         /* Read IRQ status and schedule copy accordingly. */
 231         rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf, sizeof(buf));
 232         if (buf[0] & RT5514_IRQ_STATUS_BIT)
 233                 rt5514_schedule_copy(rt5514_dsp);
 234
 235         mutex_unlock(&rt5514_dsp->dma_lock);
 236
 237         return ret;
 238 }
 239
 240 static int rt5514_spi_hw_free(struct snd_pcm_substream *substream)
 241 {
 242         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 243         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 244         struct rt5514_dsp *rt5514_dsp =
 245                 snd_soc_component_get_drvdata(component);
 246
 247         mutex_lock(&rt5514_dsp->dma_lock);
 248         rt5514_dsp->substream = NULL;
 249         mutex_unlock(&rt5514_dsp->dma_lock);
 250
 251         cancel_delayed_work_sync(&rt5514_dsp->copy_work);
 252
 253         return snd_pcm_lib_free_vmalloc_buffer(substream);
 254 }
 255
 256 static snd_pcm_uframes_t rt5514_spi_pcm_pointer(
 257                 struct snd_pcm_substream *substream)
 258 {
 259         struct snd_pcm_runtime *runtime = substream->runtime;
 260         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 261         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 262         struct rt5514_dsp *rt5514_dsp =
 263                 snd_soc_component_get_drvdata(component);
 264
 265         return bytes_to_frames(runtime, rt5514_dsp->dma_offset);
 266 }
 267
 268 static const struct snd_pcm_ops rt5514_spi_pcm_ops = {
 269         .open           = rt5514_spi_pcm_open,
 270         .hw_params      = rt5514_spi_hw_params,
 271         .hw_free        = rt5514_spi_hw_free,
 272         .pointer        = rt5514_spi_pcm_pointer,
 273         .mmap           = snd_pcm_lib_mmap_vmalloc,
 274         .page           = snd_pcm_lib_get_vmalloc_page,
 275 };
 276
 277 static int rt5514_spi_pcm_probe(struct snd_soc_component *component)
 278 {
 279         struct rt5514_dsp *rt5514_dsp;
 280         int ret;
 281
 282         rt5514_dsp = devm_kzalloc(component->dev, sizeof(*rt5514_dsp),
 283                         GFP_KERNEL);
 284
 285         rt5514_dsp->dev = &rt5514_spi->dev;
 286         mutex_init(&rt5514_dsp->dma_lock);
 287         INIT_DELAYED_WORK(&rt5514_dsp->copy_work, rt5514_spi_copy_work);
 288         snd_soc_component_set_drvdata(component, rt5514_dsp);
 289
 290         if (rt5514_spi->irq) {
 291                 ret = devm_request_threaded_irq(&rt5514_spi->dev,
 292                         rt5514_spi->irq, NULL, rt5514_spi_irq,
 293                         IRQF_TRIGGER_RISING | IRQF_ONESHOT, "rt5514-spi",
 294                         rt5514_dsp);
 295                 if (ret)
 296                         dev_err(&rt5514_spi->dev,
 297                                 "%s Failed to reguest IRQ: %d\n", __func__,
 298                                 ret);
 299                 else
 300                         device_init_wakeup(rt5514_dsp->dev, true);
 301         }
 302
 303         return 0;
 304 }
 305
 306 static const struct snd_soc_component_driver rt5514_spi_component = {
 307         .name  = DRV_NAME,
 308         .probe = rt5514_spi_pcm_probe,
 309         .ops = &rt5514_spi_pcm_ops,
 310 };
 311
 312 /**
 313  * rt5514_spi_burst_read - Read data from SPI by rt5514 address.
 314  * @addr: Start address.
 315  * @rxbuf: Data Buffer for reading.
 316  * @len: Data length, it must be a multiple of 8.
 317  *
 318  *
 319  * Returns true for success.
 320  */
 321 int rt5514_spi_burst_read(unsigned int addr, u8 *rxbuf, size_t len)
 322 {
 323         u8 spi_cmd = RT5514_SPI_CMD_BURST_READ;
 324         int status;
 325         u8 write_buf[8];
 326         unsigned int i, end, offset = 0;
 327
 328         struct spi_message message;
 329         struct spi_transfer x[3];
 330
 331         while (offset < len) {
 332                 if (offset + RT5514_SPI_BUF_LEN <= len)
 333                         end = RT5514_SPI_BUF_LEN;
 334                 else
 335                         end = len % RT5514_SPI_BUF_LEN;
 336
 337                 write_buf[0] = spi_cmd;
 338                 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
 339                 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
 340                 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
 341                 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
 342
 343                 spi_message_init(&message);
 344                 memset(x, 0, sizeof(x));
 345
 346                 x[0].len = 5;
 347                 x[0].tx_buf = write_buf;
 348                 spi_message_add_tail(&x[0], &message);
 349
 350                 x[1].len = 4;
 351                 x[1].tx_buf = write_buf;
 352                 spi_message_add_tail(&x[1], &message);
 353
 354                 x[2].len = end;
 355                 x[2].rx_buf = rxbuf + offset;
 356                 spi_message_add_tail(&x[2], &message);
 357
 358                 status = spi_sync(rt5514_spi, &message);
 359
 360                 if (status)
 361                         return false;
 362
 363                 offset += RT5514_SPI_BUF_LEN;
 364         }
 365
 366         for (i = 0; i < len; i += 8) {
 367                 write_buf[0] = rxbuf[i + 0];
 368                 write_buf[1] = rxbuf[i + 1];
 369                 write_buf[2] = rxbuf[i + 2];
 370                 write_buf[3] = rxbuf[i + 3];
 371                 write_buf[4] = rxbuf[i + 4];
 372                 write_buf[5] = rxbuf[i + 5];
 373                 write_buf[6] = rxbuf[i + 6];
 374                 write_buf[7] = rxbuf[i + 7];
 375
 376                 rxbuf[i + 0] = write_buf[7];
 377                 rxbuf[i + 1] = write_buf[6];
 378                 rxbuf[i + 2] = write_buf[5];
 379                 rxbuf[i + 3] = write_buf[4];
 380                 rxbuf[i + 4] = write_buf[3];
 381                 rxbuf[i + 5] = write_buf[2];
 382                 rxbuf[i + 6] = write_buf[1];
 383                 rxbuf[i + 7] = write_buf[0];
 384         }
 385
 386         return true;
 387 }
 388 EXPORT_SYMBOL_GPL(rt5514_spi_burst_read);
 389
 390 /**
 391  * rt5514_spi_burst_write - Write data to SPI by rt5514 address.
 392  * @addr: Start address.
 393  * @txbuf: Data Buffer for writng.
 394  * @len: Data length, it must be a multiple of 8.
 395  *
 396  *
 397  * Returns true for success.
 398  */
 399 int rt5514_spi_burst_write(u32 addr, const u8 *txbuf, size_t len)
 400 {
 401         u8 spi_cmd = RT5514_SPI_CMD_BURST_WRITE;
 402         u8 *write_buf;
 403         unsigned int i, end, offset = 0;
 404
 405         write_buf = kmalloc(RT5514_SPI_BUF_LEN + 6, GFP_KERNEL);
 406
 407         if (write_buf == NULL)
 408                 return -ENOMEM;
 409
 410         while (offset < len) {
 411                 if (offset + RT5514_SPI_BUF_LEN <= len)
 412                         end = RT5514_SPI_BUF_LEN;
 413                 else
 414                         end = len % RT5514_SPI_BUF_LEN;
 415
 416                 write_buf[0] = spi_cmd;
 417                 write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
 418                 write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
 419                 write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
 420                 write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
 421
 422                 for (i = 0; i < end; i += 8) {
 423                         write_buf[i + 12] = txbuf[offset + i + 0];
 424                         write_buf[i + 11] = txbuf[offset + i + 1];
 425                         write_buf[i + 10] = txbuf[offset + i + 2];
 426                         write_buf[i +  9] = txbuf[offset + i + 3];
 427                         write_buf[i +  8] = txbuf[offset + i + 4];
 428                         write_buf[i +  7] = txbuf[offset + i + 5];
 429                         write_buf[i +  6] = txbuf[offset + i + 6];
 430                         write_buf[i +  5] = txbuf[offset + i + 7];
 431                 }
 432
 433                 write_buf[end + 5] = spi_cmd;
 434
 435                 spi_write(rt5514_spi, write_buf, end + 6);
 436
 437                 offset += RT5514_SPI_BUF_LEN;
 438         }
 439
 440         kfree(write_buf);
 441
 442         return 0;
 443 }
 444 EXPORT_SYMBOL_GPL(rt5514_spi_burst_write);
 445
 446 static int rt5514_spi_probe(struct spi_device *spi)
 447 {
 448         int ret;
 449
 450         rt5514_spi = spi;
 451
 452         ret = devm_snd_soc_register_component(&spi->dev,
 453                                               &rt5514_spi_component,
 454                                               &rt5514_spi_dai, 1);
 455         if (ret < 0) {
 456                 dev_err(&spi->dev, "Failed to register component.\n");
 457                 return ret;
 458         }
 459
 460         return 0;
 461 }
 462
 463 static int __maybe_unused rt5514_suspend(struct device *dev)
 464 {
 465         int irq = to_spi_device(dev)->irq;
 466
 467         if (device_may_wakeup(dev))
 468                 enable_irq_wake(irq);
 469
 470         return 0;
 471 }
 472
 473 static int __maybe_unused rt5514_resume(struct device *dev)
 474 {
 475         struct snd_soc_component *component = snd_soc_lookup_component(dev, DRV_NAME);
 476         struct rt5514_dsp *rt5514_dsp =
 477                 snd_soc_component_get_drvdata(component);
 478         int irq = to_spi_device(dev)->irq;
 479         u8 buf[8];
 480
 481         if (device_may_wakeup(dev))
 482                 disable_irq_wake(irq);
 483
 484         if (rt5514_dsp) {
 485                 if (rt5514_dsp->substream) {
 486                         rt5514_spi_burst_read(RT5514_IRQ_CTRL, (u8 *)&buf,
 487                                 sizeof(buf));
 488                         if (buf[0] & RT5514_IRQ_STATUS_BIT)
 489                                 rt5514_schedule_copy(rt5514_dsp);
 490                 }
 491         }
 492
 493         return 0;
 494 }
 495
 496 static const struct dev_pm_ops rt5514_pm_ops = {
 497         SET_SYSTEM_SLEEP_PM_OPS(rt5514_suspend, rt5514_resume)
 498 };
 499
 500 static const struct of_device_id rt5514_of_match[] = {
 501         { .compatible = "realtek,rt5514", },
 502         {},
 503 };
 504 MODULE_DEVICE_TABLE(of, rt5514_of_match);
 505
 506 static struct spi_driver rt5514_spi_driver = {
 507         .driver = {
 508                 .name = "rt5514",
 509                 .pm = &rt5514_pm_ops,
 510                 .of_match_table = of_match_ptr(rt5514_of_match),
 511         },
 512         .probe = rt5514_spi_probe,
 513 };
 514 module_spi_driver(rt5514_spi_driver);
 515
 516 MODULE_DESCRIPTION("RT5514 SPI driver");
 517 MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
 518 MODULE_LICENSE("GPL v2");