1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * rt5677-spi.c -- RT5677 ALSA SoC audio codec driver 4 * 5 * Copyright 2013 Realtek Semiconductor Corp. 6 * Author: Oder Chiou <oder_chiou@realtek.com> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/input.h> 11 #include <linux/spi/spi.h> 12 #include <linux/device.h> 13 #include <linux/init.h> 14 #include <linux/delay.h> 15 #include <linux/interrupt.h> 16 #include <linux/irq.h> 17 #include <linux/slab.h> 18 #include <linux/sched.h> 19 #include <linux/uaccess.h> 20 #include <linux/regulator/consumer.h> 21 #include <linux/pm_qos.h> 22 #include <linux/sysfs.h> 23 #include <linux/clk.h> 24 #include <linux/firmware.h> 25 #include <linux/acpi.h> 26 27 #include <sound/soc.h> 28 29 #include "rt5677.h" 30 #include "rt5677-spi.h" 31 32 #define DRV_NAME "rt5677spi" 33 34 #define RT5677_SPI_BURST_LEN 240 35 #define RT5677_SPI_HEADER 5 36 #define RT5677_SPI_FREQ 6000000 37 38 /* The AddressPhase and DataPhase of SPI commands are MSB first on the wire. 39 * DataPhase word size of 16-bit commands is 2 bytes. 40 * DataPhase word size of 32-bit commands is 4 bytes. 41 * DataPhase word size of burst commands is 8 bytes. 42 * The DSP CPU is little-endian. 43 */ 44 #define RT5677_SPI_WRITE_BURST 0x5 45 #define RT5677_SPI_READ_BURST 0x4 46 #define RT5677_SPI_WRITE_32 0x3 47 #define RT5677_SPI_READ_32 0x2 48 #define RT5677_SPI_WRITE_16 0x1 49 #define RT5677_SPI_READ_16 0x0 50 51 #define RT5677_BUF_BYTES_TOTAL 0x20000 52 #define RT5677_MIC_BUF_ADDR 0x60030000 53 #define RT5677_MODEL_ADDR 0x5FFC9800 54 #define RT5677_MIC_BUF_BYTES ((u32)(RT5677_BUF_BYTES_TOTAL - \ 55 sizeof(u32))) 56 #define RT5677_MIC_BUF_FIRST_READ_SIZE 0x10000 57 58 static struct spi_device *g_spi; 59 static DEFINE_MUTEX(spi_mutex); 60 61 struct rt5677_dsp { 62 struct device *dev; 63 struct delayed_work copy_work; 64 struct mutex dma_lock; 65 struct snd_pcm_substream *substream; 66 size_t dma_offset; /* zero-based offset into runtime->dma_area */ 67 size_t avail_bytes; /* number of new bytes since last period */ 68 u32 mic_read_offset; /* zero-based offset into DSP's mic buffer */ 69 bool new_hotword; /* a new hotword is fired */ 70 }; 71 72 static const struct snd_pcm_hardware rt5677_spi_pcm_hardware = { 73 .info = SNDRV_PCM_INFO_MMAP | 74 SNDRV_PCM_INFO_MMAP_VALID | 75 SNDRV_PCM_INFO_INTERLEAVED, 76 .formats = SNDRV_PCM_FMTBIT_S16_LE, 77 .period_bytes_min = PAGE_SIZE, 78 .period_bytes_max = RT5677_BUF_BYTES_TOTAL / 8, 79 .periods_min = 8, 80 .periods_max = 8, 81 .channels_min = 1, 82 .channels_max = 1, 83 .buffer_bytes_max = RT5677_BUF_BYTES_TOTAL, 84 }; 85 86 static struct snd_soc_dai_driver rt5677_spi_dai = { 87 /* The DAI name "rt5677-dsp-cpu-dai" is not used. The actual DAI name 88 * registered with ASoC is the name of the device "spi-RT5677AA:00", 89 * because we only have one DAI. See snd_soc_register_dais(). 90 */ 91 .name = "rt5677-dsp-cpu-dai", 92 .id = 0, 93 .capture = { 94 .stream_name = "DSP Capture", 95 .channels_min = 1, 96 .channels_max = 1, 97 .rates = SNDRV_PCM_RATE_16000, 98 .formats = SNDRV_PCM_FMTBIT_S16_LE, 99 }, 100 }; 101 102 /* PCM for streaming audio from the DSP buffer */ 103 static int rt5677_spi_pcm_open( 104 struct snd_soc_component *component, 105 struct snd_pcm_substream *substream) 106 { 107 snd_soc_set_runtime_hwparams(substream, &rt5677_spi_pcm_hardware); 108 return 0; 109 } 110 111 static int rt5677_spi_pcm_close( 112 struct snd_soc_component *component, 113 struct snd_pcm_substream *substream) 114 { 115 struct snd_soc_pcm_runtime *rtd = substream->private_data; 116 struct snd_soc_component *codec_component = 117 snd_soc_rtdcom_lookup(rtd, "rt5677"); 118 struct rt5677_priv *rt5677 = 119 snd_soc_component_get_drvdata(codec_component); 120 struct rt5677_dsp *rt5677_dsp = 121 snd_soc_component_get_drvdata(component); 122 123 cancel_delayed_work_sync(&rt5677_dsp->copy_work); 124 rt5677->set_dsp_vad(codec_component, false); 125 return 0; 126 } 127 128 static int rt5677_spi_hw_params( 129 struct snd_soc_component *component, 130 struct snd_pcm_substream *substream, 131 struct snd_pcm_hw_params *hw_params) 132 { 133 struct rt5677_dsp *rt5677_dsp = 134 snd_soc_component_get_drvdata(component); 135 136 mutex_lock(&rt5677_dsp->dma_lock); 137 rt5677_dsp->substream = substream; 138 mutex_unlock(&rt5677_dsp->dma_lock); 139 140 return 0; 141 } 142 143 static int rt5677_spi_hw_free( 144 struct snd_soc_component *component, 145 struct snd_pcm_substream *substream) 146 { 147 struct rt5677_dsp *rt5677_dsp = 148 snd_soc_component_get_drvdata(component); 149 150 mutex_lock(&rt5677_dsp->dma_lock); 151 rt5677_dsp->substream = NULL; 152 mutex_unlock(&rt5677_dsp->dma_lock); 153 154 return 0; 155 } 156 157 static int rt5677_spi_prepare( 158 struct snd_soc_component *component, 159 struct snd_pcm_substream *substream) 160 { 161 struct snd_soc_pcm_runtime *rtd = substream->private_data; 162 struct snd_soc_component *rt5677_component = 163 snd_soc_rtdcom_lookup(rtd, "rt5677"); 164 struct rt5677_priv *rt5677 = 165 snd_soc_component_get_drvdata(rt5677_component); 166 struct rt5677_dsp *rt5677_dsp = 167 snd_soc_component_get_drvdata(component); 168 169 rt5677->set_dsp_vad(rt5677_component, true); 170 rt5677_dsp->dma_offset = 0; 171 rt5677_dsp->avail_bytes = 0; 172 return 0; 173 } 174 175 static snd_pcm_uframes_t rt5677_spi_pcm_pointer( 176 struct snd_soc_component *component, 177 struct snd_pcm_substream *substream) 178 { 179 struct snd_pcm_runtime *runtime = substream->runtime; 180 struct rt5677_dsp *rt5677_dsp = 181 snd_soc_component_get_drvdata(component); 182 183 return bytes_to_frames(runtime, rt5677_dsp->dma_offset); 184 } 185 186 static int rt5677_spi_mic_write_offset(u32 *mic_write_offset) 187 { 188 int ret; 189 /* Grab the first 4 bytes that hold the write pointer on the 190 * dsp, and check to make sure that it points somewhere inside the 191 * buffer. 192 */ 193 ret = rt5677_spi_read(RT5677_MIC_BUF_ADDR, mic_write_offset, 194 sizeof(u32)); 195 if (ret) 196 return ret; 197 /* Adjust the offset so that it's zero-based */ 198 *mic_write_offset = *mic_write_offset - sizeof(u32); 199 return *mic_write_offset < RT5677_MIC_BUF_BYTES ? 0 : -EFAULT; 200 } 201 202 /* 203 * Copy one contiguous block of audio samples from the DSP mic buffer to the 204 * dma_area of the pcm runtime. The receiving buffer may wrap around. 205 * @begin: start offset of the block to copy, in bytes. 206 * @end: offset of the first byte after the block to copy, must be greater 207 * than or equal to begin. 208 * 209 * Return: Zero if successful, or a negative error code on failure. 210 */ 211 static int rt5677_spi_copy_block(struct rt5677_dsp *rt5677_dsp, 212 u32 begin, u32 end) 213 { 214 struct snd_pcm_runtime *runtime = rt5677_dsp->substream->runtime; 215 size_t bytes_per_frame = frames_to_bytes(runtime, 1); 216 size_t first_chunk_len, second_chunk_len; 217 int ret; 218 219 if (begin > end || runtime->dma_bytes < 2 * bytes_per_frame) { 220 dev_err(rt5677_dsp->dev, 221 "Invalid copy from (%u, %u), dma_area size %zu\n", 222 begin, end, runtime->dma_bytes); 223 return -EINVAL; 224 } 225 226 /* The block to copy is empty */ 227 if (begin == end) 228 return 0; 229 230 /* If the incoming chunk is too big for the receiving buffer, only the 231 * last "receiving buffer size - one frame" bytes are copied. 232 */ 233 if (end - begin > runtime->dma_bytes - bytes_per_frame) 234 begin = end - (runtime->dma_bytes - bytes_per_frame); 235 236 /* May need to split to two chunks, calculate the size of each */ 237 first_chunk_len = end - begin; 238 second_chunk_len = 0; 239 if (rt5677_dsp->dma_offset + first_chunk_len > runtime->dma_bytes) { 240 /* Receiving buffer wrapped around */ 241 second_chunk_len = first_chunk_len; 242 first_chunk_len = runtime->dma_bytes - rt5677_dsp->dma_offset; 243 second_chunk_len -= first_chunk_len; 244 } 245 246 /* Copy first chunk */ 247 ret = rt5677_spi_read(RT5677_MIC_BUF_ADDR + sizeof(u32) + begin, 248 runtime->dma_area + rt5677_dsp->dma_offset, 249 first_chunk_len); 250 if (ret) 251 return ret; 252 rt5677_dsp->dma_offset += first_chunk_len; 253 if (rt5677_dsp->dma_offset == runtime->dma_bytes) 254 rt5677_dsp->dma_offset = 0; 255 256 /* Copy second chunk */ 257 if (second_chunk_len) { 258 ret = rt5677_spi_read(RT5677_MIC_BUF_ADDR + sizeof(u32) + 259 begin + first_chunk_len, runtime->dma_area, 260 second_chunk_len); 261 if (!ret) 262 rt5677_dsp->dma_offset = second_chunk_len; 263 } 264 return ret; 265 } 266 267 /* 268 * Copy a given amount of audio samples from the DSP mic buffer starting at 269 * mic_read_offset, to the dma_area of the pcm runtime. The source buffer may 270 * wrap around. mic_read_offset is updated after successful copy. 271 * @amount: amount of samples to copy, in bytes. 272 * 273 * Return: Zero if successful, or a negative error code on failure. 274 */ 275 static int rt5677_spi_copy(struct rt5677_dsp *rt5677_dsp, u32 amount) 276 { 277 int ret = 0; 278 u32 target; 279 280 if (amount == 0) 281 return ret; 282 283 target = rt5677_dsp->mic_read_offset + amount; 284 /* Copy the first chunk in DSP's mic buffer */ 285 ret |= rt5677_spi_copy_block(rt5677_dsp, rt5677_dsp->mic_read_offset, 286 min(target, RT5677_MIC_BUF_BYTES)); 287 288 if (target >= RT5677_MIC_BUF_BYTES) { 289 /* Wrap around, copy the second chunk */ 290 target -= RT5677_MIC_BUF_BYTES; 291 ret |= rt5677_spi_copy_block(rt5677_dsp, 0, target); 292 } 293 294 if (!ret) 295 rt5677_dsp->mic_read_offset = target; 296 return ret; 297 } 298 299 /* 300 * A delayed work that streams audio samples from the DSP mic buffer to the 301 * dma_area of the pcm runtime via SPI. 302 */ 303 static void rt5677_spi_copy_work(struct work_struct *work) 304 { 305 struct rt5677_dsp *rt5677_dsp = 306 container_of(work, struct rt5677_dsp, copy_work.work); 307 struct snd_pcm_runtime *runtime; 308 u32 mic_write_offset; 309 size_t new_bytes, copy_bytes, period_bytes; 310 unsigned int delay; 311 int ret = 0; 312 313 /* Ensure runtime->dma_area buffer does not go away while copying. */ 314 mutex_lock(&rt5677_dsp->dma_lock); 315 if (!rt5677_dsp->substream) { 316 dev_err(rt5677_dsp->dev, "No pcm substream\n"); 317 goto done; 318 } 319 320 runtime = rt5677_dsp->substream->runtime; 321 322 if (rt5677_spi_mic_write_offset(&mic_write_offset)) { 323 dev_err(rt5677_dsp->dev, "No mic_write_offset\n"); 324 goto done; 325 } 326 327 /* If this is the first time that we've asked for streaming data after 328 * a hotword is fired, we should start reading from the previous 2 329 * seconds of audio from wherever the mic_write_offset is currently. 330 */ 331 if (rt5677_dsp->new_hotword) { 332 rt5677_dsp->new_hotword = false; 333 /* See if buffer wraparound happens */ 334 if (mic_write_offset < RT5677_MIC_BUF_FIRST_READ_SIZE) 335 rt5677_dsp->mic_read_offset = RT5677_MIC_BUF_BYTES - 336 (RT5677_MIC_BUF_FIRST_READ_SIZE - 337 mic_write_offset); 338 else 339 rt5677_dsp->mic_read_offset = mic_write_offset - 340 RT5677_MIC_BUF_FIRST_READ_SIZE; 341 } 342 343 /* Calculate the amount of new samples in bytes */ 344 if (rt5677_dsp->mic_read_offset <= mic_write_offset) 345 new_bytes = mic_write_offset - rt5677_dsp->mic_read_offset; 346 else 347 new_bytes = RT5677_MIC_BUF_BYTES + mic_write_offset 348 - rt5677_dsp->mic_read_offset; 349 350 /* Copy all new samples from DSP mic buffer, one period at a time */ 351 period_bytes = snd_pcm_lib_period_bytes(rt5677_dsp->substream); 352 while (new_bytes) { 353 copy_bytes = min(new_bytes, period_bytes 354 - rt5677_dsp->avail_bytes); 355 ret = rt5677_spi_copy(rt5677_dsp, copy_bytes); 356 if (ret) { 357 dev_err(rt5677_dsp->dev, "Copy failed %d\n", ret); 358 goto done; 359 } 360 rt5677_dsp->avail_bytes += copy_bytes; 361 if (rt5677_dsp->avail_bytes >= period_bytes) { 362 snd_pcm_period_elapsed(rt5677_dsp->substream); 363 rt5677_dsp->avail_bytes = 0; 364 } 365 new_bytes -= copy_bytes; 366 } 367 368 delay = bytes_to_frames(runtime, period_bytes) / (runtime->rate / 1000); 369 schedule_delayed_work(&rt5677_dsp->copy_work, msecs_to_jiffies(delay)); 370 done: 371 mutex_unlock(&rt5677_dsp->dma_lock); 372 } 373 374 static int rt5677_spi_pcm_new(struct snd_soc_component *component, 375 struct snd_soc_pcm_runtime *rtd) 376 { 377 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_VMALLOC, 378 NULL, 0, 0); 379 return 0; 380 } 381 382 static int rt5677_spi_pcm_probe(struct snd_soc_component *component) 383 { 384 struct rt5677_dsp *rt5677_dsp; 385 386 rt5677_dsp = devm_kzalloc(component->dev, sizeof(*rt5677_dsp), 387 GFP_KERNEL); 388 if (!rt5677_dsp) 389 return -ENOMEM; 390 rt5677_dsp->dev = &g_spi->dev; 391 mutex_init(&rt5677_dsp->dma_lock); 392 INIT_DELAYED_WORK(&rt5677_dsp->copy_work, rt5677_spi_copy_work); 393 394 snd_soc_component_set_drvdata(component, rt5677_dsp); 395 return 0; 396 } 397 398 static const struct snd_soc_component_driver rt5677_spi_dai_component = { 399 .name = DRV_NAME, 400 .probe = rt5677_spi_pcm_probe, 401 .open = rt5677_spi_pcm_open, 402 .close = rt5677_spi_pcm_close, 403 .hw_params = rt5677_spi_hw_params, 404 .hw_free = rt5677_spi_hw_free, 405 .prepare = rt5677_spi_prepare, 406 .pointer = rt5677_spi_pcm_pointer, 407 .pcm_construct = rt5677_spi_pcm_new, 408 }; 409 410 /* Select a suitable transfer command for the next transfer to ensure 411 * the transfer address is always naturally aligned while minimizing 412 * the total number of transfers required. 413 * 414 * 3 transfer commands are available: 415 * RT5677_SPI_READ/WRITE_16: Transfer 2 bytes 416 * RT5677_SPI_READ/WRITE_32: Transfer 4 bytes 417 * RT5677_SPI_READ/WRITE_BURST: Transfer any multiples of 8 bytes 418 * 419 * Note: 420 * 16 Bit writes and reads are restricted to the address range 421 * 0x18020000 ~ 0x18021000 422 * 423 * For example, reading 256 bytes at 0x60030004 uses the following commands: 424 * 0x60030004 RT5677_SPI_READ_32 4 bytes 425 * 0x60030008 RT5677_SPI_READ_BURST 240 bytes 426 * 0x600300F8 RT5677_SPI_READ_BURST 8 bytes 427 * 0x60030100 RT5677_SPI_READ_32 4 bytes 428 * 429 * Input: 430 * @read: true for read commands; false for write commands 431 * @align: alignment of the next transfer address 432 * @remain: number of bytes remaining to transfer 433 * 434 * Output: 435 * @len: number of bytes to transfer with the selected command 436 * Returns the selected command 437 */ 438 static u8 rt5677_spi_select_cmd(bool read, u32 align, u32 remain, u32 *len) 439 { 440 u8 cmd; 441 442 if (align == 4 || remain <= 4) { 443 cmd = RT5677_SPI_READ_32; 444 *len = 4; 445 } else { 446 cmd = RT5677_SPI_READ_BURST; 447 *len = (((remain - 1) >> 3) + 1) << 3; 448 *len = min_t(u32, *len, RT5677_SPI_BURST_LEN); 449 } 450 return read ? cmd : cmd + 1; 451 } 452 453 /* Copy dstlen bytes from src to dst, while reversing byte order for each word. 454 * If srclen < dstlen, zeros are padded. 455 */ 456 static void rt5677_spi_reverse(u8 *dst, u32 dstlen, const u8 *src, u32 srclen) 457 { 458 u32 w, i, si; 459 u32 word_size = min_t(u32, dstlen, 8); 460 461 for (w = 0; w < dstlen; w += word_size) { 462 for (i = 0; i < word_size && i + w < dstlen; i++) { 463 si = w + word_size - i - 1; 464 dst[w + i] = si < srclen ? src[si] : 0; 465 } 466 } 467 } 468 469 /* Read DSP address space using SPI. addr and len have to be 4-byte aligned. */ 470 int rt5677_spi_read(u32 addr, void *rxbuf, size_t len) 471 { 472 u32 offset; 473 int status = 0; 474 struct spi_transfer t[2]; 475 struct spi_message m; 476 /* +4 bytes is for the DummyPhase following the AddressPhase */ 477 u8 header[RT5677_SPI_HEADER + 4]; 478 u8 body[RT5677_SPI_BURST_LEN]; 479 u8 spi_cmd; 480 u8 *cb = rxbuf; 481 482 if (!g_spi) 483 return -ENODEV; 484 485 if ((addr & 3) || (len & 3)) { 486 dev_err(&g_spi->dev, "Bad read align 0x%x(%zu)\n", addr, len); 487 return -EACCES; 488 } 489 490 memset(t, 0, sizeof(t)); 491 t[0].tx_buf = header; 492 t[0].len = sizeof(header); 493 t[0].speed_hz = RT5677_SPI_FREQ; 494 t[1].rx_buf = body; 495 t[1].speed_hz = RT5677_SPI_FREQ; 496 spi_message_init_with_transfers(&m, t, ARRAY_SIZE(t)); 497 498 for (offset = 0; offset < len; offset += t[1].len) { 499 spi_cmd = rt5677_spi_select_cmd(true, (addr + offset) & 7, 500 len - offset, &t[1].len); 501 502 /* Construct SPI message header */ 503 header[0] = spi_cmd; 504 header[1] = ((addr + offset) & 0xff000000) >> 24; 505 header[2] = ((addr + offset) & 0x00ff0000) >> 16; 506 header[3] = ((addr + offset) & 0x0000ff00) >> 8; 507 header[4] = ((addr + offset) & 0x000000ff) >> 0; 508 509 mutex_lock(&spi_mutex); 510 status |= spi_sync(g_spi, &m); 511 mutex_unlock(&spi_mutex); 512 513 514 /* Copy data back to caller buffer */ 515 rt5677_spi_reverse(cb + offset, len - offset, body, t[1].len); 516 } 517 return status; 518 } 519 EXPORT_SYMBOL_GPL(rt5677_spi_read); 520 521 /* Write DSP address space using SPI. addr has to be 4-byte aligned. 522 * If len is not 4-byte aligned, then extra zeros are written at the end 523 * as padding. 524 */ 525 int rt5677_spi_write(u32 addr, const void *txbuf, size_t len) 526 { 527 u32 offset; 528 int status = 0; 529 struct spi_transfer t; 530 struct spi_message m; 531 /* +1 byte is for the DummyPhase following the DataPhase */ 532 u8 buf[RT5677_SPI_HEADER + RT5677_SPI_BURST_LEN + 1]; 533 u8 *body = buf + RT5677_SPI_HEADER; 534 u8 spi_cmd; 535 const u8 *cb = txbuf; 536 537 if (!g_spi) 538 return -ENODEV; 539 540 if (addr & 3) { 541 dev_err(&g_spi->dev, "Bad write align 0x%x(%zu)\n", addr, len); 542 return -EACCES; 543 } 544 545 memset(&t, 0, sizeof(t)); 546 t.tx_buf = buf; 547 t.speed_hz = RT5677_SPI_FREQ; 548 spi_message_init_with_transfers(&m, &t, 1); 549 550 for (offset = 0; offset < len;) { 551 spi_cmd = rt5677_spi_select_cmd(false, (addr + offset) & 7, 552 len - offset, &t.len); 553 554 /* Construct SPI message header */ 555 buf[0] = spi_cmd; 556 buf[1] = ((addr + offset) & 0xff000000) >> 24; 557 buf[2] = ((addr + offset) & 0x00ff0000) >> 16; 558 buf[3] = ((addr + offset) & 0x0000ff00) >> 8; 559 buf[4] = ((addr + offset) & 0x000000ff) >> 0; 560 561 /* Fetch data from caller buffer */ 562 rt5677_spi_reverse(body, t.len, cb + offset, len - offset); 563 offset += t.len; 564 t.len += RT5677_SPI_HEADER + 1; 565 566 mutex_lock(&spi_mutex); 567 status |= spi_sync(g_spi, &m); 568 mutex_unlock(&spi_mutex); 569 } 570 return status; 571 } 572 EXPORT_SYMBOL_GPL(rt5677_spi_write); 573 574 int rt5677_spi_write_firmware(u32 addr, const struct firmware *fw) 575 { 576 return rt5677_spi_write(addr, fw->data, fw->size); 577 } 578 EXPORT_SYMBOL_GPL(rt5677_spi_write_firmware); 579 580 void rt5677_spi_hotword_detected(void) 581 { 582 struct rt5677_dsp *rt5677_dsp; 583 584 if (!g_spi) 585 return; 586 587 rt5677_dsp = dev_get_drvdata(&g_spi->dev); 588 if (!rt5677_dsp) { 589 dev_err(&g_spi->dev, "Can't get rt5677_dsp\n"); 590 return; 591 } 592 593 mutex_lock(&rt5677_dsp->dma_lock); 594 dev_info(rt5677_dsp->dev, "Hotword detected\n"); 595 rt5677_dsp->new_hotword = true; 596 mutex_unlock(&rt5677_dsp->dma_lock); 597 598 schedule_delayed_work(&rt5677_dsp->copy_work, 0); 599 } 600 EXPORT_SYMBOL_GPL(rt5677_spi_hotword_detected); 601 602 static int rt5677_spi_probe(struct spi_device *spi) 603 { 604 int ret; 605 606 g_spi = spi; 607 608 ret = snd_soc_register_component(&spi->dev, &rt5677_spi_dai_component, 609 &rt5677_spi_dai, 1); 610 if (ret < 0) 611 dev_err(&spi->dev, "Failed to register component.\n"); 612 613 return ret; 614 } 615 616 static int rt5677_spi_remove(struct spi_device *spi) 617 { 618 snd_soc_unregister_component(&spi->dev); 619 return 0; 620 } 621 622 static const struct acpi_device_id rt5677_spi_acpi_id[] = { 623 { "RT5677AA", 0 }, 624 { } 625 }; 626 MODULE_DEVICE_TABLE(acpi, rt5677_spi_acpi_id); 627 628 static struct spi_driver rt5677_spi_driver = { 629 .driver = { 630 .name = DRV_NAME, 631 .acpi_match_table = ACPI_PTR(rt5677_spi_acpi_id), 632 }, 633 .probe = rt5677_spi_probe, 634 .remove = rt5677_spi_remove, 635 }; 636 module_spi_driver(rt5677_spi_driver); 637 638 MODULE_DESCRIPTION("ASoC RT5677 SPI driver"); 639 MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>"); 640 MODULE_LICENSE("GPL v2"); 641