1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Driver for AT73C213 16-bit stereo DAC connected to Atmel SSC 4 * 5 * Copyright (C) 2006-2007 Atmel Norway 6 */ 7 8 /*#define DEBUG*/ 9 10 #include <linux/clk.h> 11 #include <linux/err.h> 12 #include <linux/delay.h> 13 #include <linux/device.h> 14 #include <linux/dma-mapping.h> 15 #include <linux/init.h> 16 #include <linux/interrupt.h> 17 #include <linux/module.h> 18 #include <linux/mutex.h> 19 #include <linux/platform_device.h> 20 #include <linux/io.h> 21 22 #include <sound/initval.h> 23 #include <sound/control.h> 24 #include <sound/core.h> 25 #include <sound/pcm.h> 26 27 #include <linux/atmel-ssc.h> 28 29 #include <linux/spi/spi.h> 30 #include <linux/spi/at73c213.h> 31 32 #include "at73c213.h" 33 34 #define BITRATE_MIN 8000 /* Hardware limit? */ 35 #define BITRATE_TARGET CONFIG_SND_AT73C213_TARGET_BITRATE 36 #define BITRATE_MAX 50000 /* Hardware limit. */ 37 38 /* Initial (hardware reset) AT73C213 register values. */ 39 static u8 snd_at73c213_original_image[18] = 40 { 41 0x00, /* 00 - CTRL */ 42 0x05, /* 01 - LLIG */ 43 0x05, /* 02 - RLIG */ 44 0x08, /* 03 - LPMG */ 45 0x08, /* 04 - RPMG */ 46 0x00, /* 05 - LLOG */ 47 0x00, /* 06 - RLOG */ 48 0x22, /* 07 - OLC */ 49 0x09, /* 08 - MC */ 50 0x00, /* 09 - CSFC */ 51 0x00, /* 0A - MISC */ 52 0x00, /* 0B - */ 53 0x00, /* 0C - PRECH */ 54 0x05, /* 0D - AUXG */ 55 0x00, /* 0E - */ 56 0x00, /* 0F - */ 57 0x00, /* 10 - RST */ 58 0x00, /* 11 - PA_CTRL */ 59 }; 60 61 struct snd_at73c213 { 62 struct snd_card *card; 63 struct snd_pcm *pcm; 64 struct snd_pcm_substream *substream; 65 struct at73c213_board_info *board; 66 int irq; 67 int period; 68 unsigned long bitrate; 69 struct ssc_device *ssc; 70 struct spi_device *spi; 71 u8 spi_wbuffer[2]; 72 u8 spi_rbuffer[2]; 73 /* Image of the SPI registers in AT73C213. */ 74 u8 reg_image[18]; 75 /* Protect SSC registers against concurrent access. */ 76 spinlock_t lock; 77 /* Protect mixer registers against concurrent access. */ 78 struct mutex mixer_lock; 79 }; 80 81 #define get_chip(card) ((struct snd_at73c213 *)card->private_data) 82 83 static int 84 snd_at73c213_write_reg(struct snd_at73c213 *chip, u8 reg, u8 val) 85 { 86 struct spi_message msg; 87 struct spi_transfer msg_xfer = { 88 .len = 2, 89 .cs_change = 0, 90 }; 91 int retval; 92 93 spi_message_init(&msg); 94 95 chip->spi_wbuffer[0] = reg; 96 chip->spi_wbuffer[1] = val; 97 98 msg_xfer.tx_buf = chip->spi_wbuffer; 99 msg_xfer.rx_buf = chip->spi_rbuffer; 100 spi_message_add_tail(&msg_xfer, &msg); 101 102 retval = spi_sync(chip->spi, &msg); 103 104 if (!retval) 105 chip->reg_image[reg] = val; 106 107 return retval; 108 } 109 110 static struct snd_pcm_hardware snd_at73c213_playback_hw = { 111 .info = SNDRV_PCM_INFO_INTERLEAVED | 112 SNDRV_PCM_INFO_BLOCK_TRANSFER, 113 .formats = SNDRV_PCM_FMTBIT_S16_BE, 114 .rates = SNDRV_PCM_RATE_CONTINUOUS, 115 .rate_min = 8000, /* Replaced by chip->bitrate later. */ 116 .rate_max = 50000, /* Replaced by chip->bitrate later. */ 117 .channels_min = 1, 118 .channels_max = 2, 119 .buffer_bytes_max = 64 * 1024 - 1, 120 .period_bytes_min = 512, 121 .period_bytes_max = 64 * 1024 - 1, 122 .periods_min = 4, 123 .periods_max = 1024, 124 }; 125 126 /* 127 * Calculate and set bitrate and divisions. 128 */ 129 static int snd_at73c213_set_bitrate(struct snd_at73c213 *chip) 130 { 131 unsigned long ssc_rate = clk_get_rate(chip->ssc->clk); 132 unsigned long dac_rate_new, ssc_div; 133 int status; 134 unsigned long ssc_div_max, ssc_div_min; 135 int max_tries; 136 137 /* 138 * We connect two clocks here, picking divisors so the I2S clocks 139 * out data at the same rate the DAC clocks it in ... and as close 140 * as practical to the desired target rate. 141 * 142 * The DAC master clock (MCLK) is programmable, and is either 256 143 * or (not here) 384 times the I2S output clock (BCLK). 144 */ 145 146 /* SSC clock / (bitrate * stereo * 16-bit). */ 147 ssc_div = ssc_rate / (BITRATE_TARGET * 2 * 16); 148 ssc_div_min = ssc_rate / (BITRATE_MAX * 2 * 16); 149 ssc_div_max = ssc_rate / (BITRATE_MIN * 2 * 16); 150 max_tries = (ssc_div_max - ssc_div_min) / 2; 151 152 if (max_tries < 1) 153 max_tries = 1; 154 155 /* ssc_div must be even. */ 156 ssc_div = (ssc_div + 1) & ~1UL; 157 158 if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN) { 159 ssc_div -= 2; 160 if ((ssc_rate / (ssc_div * 2 * 16)) > BITRATE_MAX) 161 return -ENXIO; 162 } 163 164 /* Search for a possible bitrate. */ 165 do { 166 /* SSC clock / (ssc divider * 16-bit * stereo). */ 167 if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN) 168 return -ENXIO; 169 170 /* 256 / (2 * 16) = 8 */ 171 dac_rate_new = 8 * (ssc_rate / ssc_div); 172 173 status = clk_round_rate(chip->board->dac_clk, dac_rate_new); 174 if (status <= 0) 175 return status; 176 177 /* Ignore difference smaller than 256 Hz. */ 178 if ((status/256) == (dac_rate_new/256)) 179 goto set_rate; 180 181 ssc_div += 2; 182 } while (--max_tries); 183 184 /* Not able to find a valid bitrate. */ 185 return -ENXIO; 186 187 set_rate: 188 status = clk_set_rate(chip->board->dac_clk, status); 189 if (status < 0) 190 return status; 191 192 /* Set divider in SSC device. */ 193 ssc_writel(chip->ssc->regs, CMR, ssc_div/2); 194 195 /* SSC clock / (ssc divider * 16-bit * stereo). */ 196 chip->bitrate = ssc_rate / (ssc_div * 16 * 2); 197 198 dev_info(&chip->spi->dev, 199 "at73c213: supported bitrate is %lu (%lu divider)\n", 200 chip->bitrate, ssc_div); 201 202 return 0; 203 } 204 205 static int snd_at73c213_pcm_open(struct snd_pcm_substream *substream) 206 { 207 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 208 struct snd_pcm_runtime *runtime = substream->runtime; 209 int err; 210 211 /* ensure buffer_size is a multiple of period_size */ 212 err = snd_pcm_hw_constraint_integer(runtime, 213 SNDRV_PCM_HW_PARAM_PERIODS); 214 if (err < 0) 215 return err; 216 snd_at73c213_playback_hw.rate_min = chip->bitrate; 217 snd_at73c213_playback_hw.rate_max = chip->bitrate; 218 runtime->hw = snd_at73c213_playback_hw; 219 chip->substream = substream; 220 221 clk_enable(chip->ssc->clk); 222 223 return 0; 224 } 225 226 static int snd_at73c213_pcm_close(struct snd_pcm_substream *substream) 227 { 228 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 229 chip->substream = NULL; 230 clk_disable(chip->ssc->clk); 231 return 0; 232 } 233 234 static int snd_at73c213_pcm_hw_params(struct snd_pcm_substream *substream, 235 struct snd_pcm_hw_params *hw_params) 236 { 237 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 238 int channels = params_channels(hw_params); 239 int val; 240 241 val = ssc_readl(chip->ssc->regs, TFMR); 242 val = SSC_BFINS(TFMR_DATNB, channels - 1, val); 243 ssc_writel(chip->ssc->regs, TFMR, val); 244 245 return snd_pcm_lib_malloc_pages(substream, 246 params_buffer_bytes(hw_params)); 247 } 248 249 static int snd_at73c213_pcm_hw_free(struct snd_pcm_substream *substream) 250 { 251 return snd_pcm_lib_free_pages(substream); 252 } 253 254 static int snd_at73c213_pcm_prepare(struct snd_pcm_substream *substream) 255 { 256 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 257 struct snd_pcm_runtime *runtime = substream->runtime; 258 int block_size; 259 260 block_size = frames_to_bytes(runtime, runtime->period_size); 261 262 chip->period = 0; 263 264 ssc_writel(chip->ssc->regs, PDC_TPR, 265 (long)runtime->dma_addr); 266 ssc_writel(chip->ssc->regs, PDC_TCR, 267 runtime->period_size * runtime->channels); 268 ssc_writel(chip->ssc->regs, PDC_TNPR, 269 (long)runtime->dma_addr + block_size); 270 ssc_writel(chip->ssc->regs, PDC_TNCR, 271 runtime->period_size * runtime->channels); 272 273 return 0; 274 } 275 276 static int snd_at73c213_pcm_trigger(struct snd_pcm_substream *substream, 277 int cmd) 278 { 279 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 280 int retval = 0; 281 282 spin_lock(&chip->lock); 283 284 switch (cmd) { 285 case SNDRV_PCM_TRIGGER_START: 286 ssc_writel(chip->ssc->regs, IER, SSC_BIT(IER_ENDTX)); 287 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTEN)); 288 break; 289 case SNDRV_PCM_TRIGGER_STOP: 290 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTDIS)); 291 ssc_writel(chip->ssc->regs, IDR, SSC_BIT(IDR_ENDTX)); 292 break; 293 default: 294 dev_dbg(&chip->spi->dev, "spurious command %x\n", cmd); 295 retval = -EINVAL; 296 break; 297 } 298 299 spin_unlock(&chip->lock); 300 301 return retval; 302 } 303 304 static snd_pcm_uframes_t 305 snd_at73c213_pcm_pointer(struct snd_pcm_substream *substream) 306 { 307 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 308 struct snd_pcm_runtime *runtime = substream->runtime; 309 snd_pcm_uframes_t pos; 310 unsigned long bytes; 311 312 bytes = ssc_readl(chip->ssc->regs, PDC_TPR) 313 - (unsigned long)runtime->dma_addr; 314 315 pos = bytes_to_frames(runtime, bytes); 316 if (pos >= runtime->buffer_size) 317 pos -= runtime->buffer_size; 318 319 return pos; 320 } 321 322 static const struct snd_pcm_ops at73c213_playback_ops = { 323 .open = snd_at73c213_pcm_open, 324 .close = snd_at73c213_pcm_close, 325 .ioctl = snd_pcm_lib_ioctl, 326 .hw_params = snd_at73c213_pcm_hw_params, 327 .hw_free = snd_at73c213_pcm_hw_free, 328 .prepare = snd_at73c213_pcm_prepare, 329 .trigger = snd_at73c213_pcm_trigger, 330 .pointer = snd_at73c213_pcm_pointer, 331 }; 332 333 static int snd_at73c213_pcm_new(struct snd_at73c213 *chip, int device) 334 { 335 struct snd_pcm *pcm; 336 int retval; 337 338 retval = snd_pcm_new(chip->card, chip->card->shortname, 339 device, 1, 0, &pcm); 340 if (retval < 0) 341 goto out; 342 343 pcm->private_data = chip; 344 pcm->info_flags = SNDRV_PCM_INFO_BLOCK_TRANSFER; 345 strcpy(pcm->name, "at73c213"); 346 chip->pcm = pcm; 347 348 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &at73c213_playback_ops); 349 350 snd_pcm_lib_preallocate_pages_for_all(chip->pcm, 351 SNDRV_DMA_TYPE_DEV, &chip->ssc->pdev->dev, 352 64 * 1024, 64 * 1024); 353 out: 354 return retval; 355 } 356 357 static irqreturn_t snd_at73c213_interrupt(int irq, void *dev_id) 358 { 359 struct snd_at73c213 *chip = dev_id; 360 struct snd_pcm_runtime *runtime = chip->substream->runtime; 361 u32 status; 362 int offset; 363 int block_size; 364 int next_period; 365 int retval = IRQ_NONE; 366 367 spin_lock(&chip->lock); 368 369 block_size = frames_to_bytes(runtime, runtime->period_size); 370 status = ssc_readl(chip->ssc->regs, IMR); 371 372 if (status & SSC_BIT(IMR_ENDTX)) { 373 chip->period++; 374 if (chip->period == runtime->periods) 375 chip->period = 0; 376 next_period = chip->period + 1; 377 if (next_period == runtime->periods) 378 next_period = 0; 379 380 offset = block_size * next_period; 381 382 ssc_writel(chip->ssc->regs, PDC_TNPR, 383 (long)runtime->dma_addr + offset); 384 ssc_writel(chip->ssc->regs, PDC_TNCR, 385 runtime->period_size * runtime->channels); 386 retval = IRQ_HANDLED; 387 } 388 389 ssc_readl(chip->ssc->regs, IMR); 390 spin_unlock(&chip->lock); 391 392 if (status & SSC_BIT(IMR_ENDTX)) 393 snd_pcm_period_elapsed(chip->substream); 394 395 return retval; 396 } 397 398 /* 399 * Mixer functions. 400 */ 401 static int snd_at73c213_mono_get(struct snd_kcontrol *kcontrol, 402 struct snd_ctl_elem_value *ucontrol) 403 { 404 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 405 int reg = kcontrol->private_value & 0xff; 406 int shift = (kcontrol->private_value >> 8) & 0xff; 407 int mask = (kcontrol->private_value >> 16) & 0xff; 408 int invert = (kcontrol->private_value >> 24) & 0xff; 409 410 mutex_lock(&chip->mixer_lock); 411 412 ucontrol->value.integer.value[0] = 413 (chip->reg_image[reg] >> shift) & mask; 414 415 if (invert) 416 ucontrol->value.integer.value[0] = 417 mask - ucontrol->value.integer.value[0]; 418 419 mutex_unlock(&chip->mixer_lock); 420 421 return 0; 422 } 423 424 static int snd_at73c213_mono_put(struct snd_kcontrol *kcontrol, 425 struct snd_ctl_elem_value *ucontrol) 426 { 427 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 428 int reg = kcontrol->private_value & 0xff; 429 int shift = (kcontrol->private_value >> 8) & 0xff; 430 int mask = (kcontrol->private_value >> 16) & 0xff; 431 int invert = (kcontrol->private_value >> 24) & 0xff; 432 int change, retval; 433 unsigned short val; 434 435 val = (ucontrol->value.integer.value[0] & mask); 436 if (invert) 437 val = mask - val; 438 val <<= shift; 439 440 mutex_lock(&chip->mixer_lock); 441 442 val = (chip->reg_image[reg] & ~(mask << shift)) | val; 443 change = val != chip->reg_image[reg]; 444 retval = snd_at73c213_write_reg(chip, reg, val); 445 446 mutex_unlock(&chip->mixer_lock); 447 448 if (retval) 449 return retval; 450 451 return change; 452 } 453 454 static int snd_at73c213_stereo_info(struct snd_kcontrol *kcontrol, 455 struct snd_ctl_elem_info *uinfo) 456 { 457 int mask = (kcontrol->private_value >> 24) & 0xff; 458 459 if (mask == 1) 460 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; 461 else 462 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 463 464 uinfo->count = 2; 465 uinfo->value.integer.min = 0; 466 uinfo->value.integer.max = mask; 467 468 return 0; 469 } 470 471 static int snd_at73c213_stereo_get(struct snd_kcontrol *kcontrol, 472 struct snd_ctl_elem_value *ucontrol) 473 { 474 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 475 int left_reg = kcontrol->private_value & 0xff; 476 int right_reg = (kcontrol->private_value >> 8) & 0xff; 477 int shift_left = (kcontrol->private_value >> 16) & 0x07; 478 int shift_right = (kcontrol->private_value >> 19) & 0x07; 479 int mask = (kcontrol->private_value >> 24) & 0xff; 480 int invert = (kcontrol->private_value >> 22) & 1; 481 482 mutex_lock(&chip->mixer_lock); 483 484 ucontrol->value.integer.value[0] = 485 (chip->reg_image[left_reg] >> shift_left) & mask; 486 ucontrol->value.integer.value[1] = 487 (chip->reg_image[right_reg] >> shift_right) & mask; 488 489 if (invert) { 490 ucontrol->value.integer.value[0] = 491 mask - ucontrol->value.integer.value[0]; 492 ucontrol->value.integer.value[1] = 493 mask - ucontrol->value.integer.value[1]; 494 } 495 496 mutex_unlock(&chip->mixer_lock); 497 498 return 0; 499 } 500 501 static int snd_at73c213_stereo_put(struct snd_kcontrol *kcontrol, 502 struct snd_ctl_elem_value *ucontrol) 503 { 504 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 505 int left_reg = kcontrol->private_value & 0xff; 506 int right_reg = (kcontrol->private_value >> 8) & 0xff; 507 int shift_left = (kcontrol->private_value >> 16) & 0x07; 508 int shift_right = (kcontrol->private_value >> 19) & 0x07; 509 int mask = (kcontrol->private_value >> 24) & 0xff; 510 int invert = (kcontrol->private_value >> 22) & 1; 511 int change, retval; 512 unsigned short val1, val2; 513 514 val1 = ucontrol->value.integer.value[0] & mask; 515 val2 = ucontrol->value.integer.value[1] & mask; 516 if (invert) { 517 val1 = mask - val1; 518 val2 = mask - val2; 519 } 520 val1 <<= shift_left; 521 val2 <<= shift_right; 522 523 mutex_lock(&chip->mixer_lock); 524 525 val1 = (chip->reg_image[left_reg] & ~(mask << shift_left)) | val1; 526 val2 = (chip->reg_image[right_reg] & ~(mask << shift_right)) | val2; 527 change = val1 != chip->reg_image[left_reg] 528 || val2 != chip->reg_image[right_reg]; 529 retval = snd_at73c213_write_reg(chip, left_reg, val1); 530 if (retval) { 531 mutex_unlock(&chip->mixer_lock); 532 goto out; 533 } 534 retval = snd_at73c213_write_reg(chip, right_reg, val2); 535 if (retval) { 536 mutex_unlock(&chip->mixer_lock); 537 goto out; 538 } 539 540 mutex_unlock(&chip->mixer_lock); 541 542 return change; 543 544 out: 545 return retval; 546 } 547 548 #define snd_at73c213_mono_switch_info snd_ctl_boolean_mono_info 549 550 static int snd_at73c213_mono_switch_get(struct snd_kcontrol *kcontrol, 551 struct snd_ctl_elem_value *ucontrol) 552 { 553 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 554 int reg = kcontrol->private_value & 0xff; 555 int shift = (kcontrol->private_value >> 8) & 0xff; 556 int invert = (kcontrol->private_value >> 24) & 0xff; 557 558 mutex_lock(&chip->mixer_lock); 559 560 ucontrol->value.integer.value[0] = 561 (chip->reg_image[reg] >> shift) & 0x01; 562 563 if (invert) 564 ucontrol->value.integer.value[0] = 565 0x01 - ucontrol->value.integer.value[0]; 566 567 mutex_unlock(&chip->mixer_lock); 568 569 return 0; 570 } 571 572 static int snd_at73c213_mono_switch_put(struct snd_kcontrol *kcontrol, 573 struct snd_ctl_elem_value *ucontrol) 574 { 575 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 576 int reg = kcontrol->private_value & 0xff; 577 int shift = (kcontrol->private_value >> 8) & 0xff; 578 int mask = (kcontrol->private_value >> 16) & 0xff; 579 int invert = (kcontrol->private_value >> 24) & 0xff; 580 int change, retval; 581 unsigned short val; 582 583 if (ucontrol->value.integer.value[0]) 584 val = mask; 585 else 586 val = 0; 587 588 if (invert) 589 val = mask - val; 590 val <<= shift; 591 592 mutex_lock(&chip->mixer_lock); 593 594 val |= (chip->reg_image[reg] & ~(mask << shift)); 595 change = val != chip->reg_image[reg]; 596 597 retval = snd_at73c213_write_reg(chip, reg, val); 598 599 mutex_unlock(&chip->mixer_lock); 600 601 if (retval) 602 return retval; 603 604 return change; 605 } 606 607 static int snd_at73c213_pa_volume_info(struct snd_kcontrol *kcontrol, 608 struct snd_ctl_elem_info *uinfo) 609 { 610 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 611 uinfo->count = 1; 612 uinfo->value.integer.min = 0; 613 uinfo->value.integer.max = ((kcontrol->private_value >> 16) & 0xff) - 1; 614 615 return 0; 616 } 617 618 static int snd_at73c213_line_capture_volume_info( 619 struct snd_kcontrol *kcontrol, 620 struct snd_ctl_elem_info *uinfo) 621 { 622 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 623 uinfo->count = 2; 624 /* When inverted will give values 0x10001 => 0. */ 625 uinfo->value.integer.min = 14; 626 uinfo->value.integer.max = 31; 627 628 return 0; 629 } 630 631 static int snd_at73c213_aux_capture_volume_info( 632 struct snd_kcontrol *kcontrol, 633 struct snd_ctl_elem_info *uinfo) 634 { 635 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 636 uinfo->count = 1; 637 /* When inverted will give values 0x10001 => 0. */ 638 uinfo->value.integer.min = 14; 639 uinfo->value.integer.max = 31; 640 641 return 0; 642 } 643 644 #define AT73C213_MONO_SWITCH(xname, xindex, reg, shift, mask, invert) \ 645 { \ 646 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \ 647 .name = xname, \ 648 .index = xindex, \ 649 .info = snd_at73c213_mono_switch_info, \ 650 .get = snd_at73c213_mono_switch_get, \ 651 .put = snd_at73c213_mono_switch_put, \ 652 .private_value = (reg | (shift << 8) | (mask << 16) | (invert << 24)) \ 653 } 654 655 #define AT73C213_STEREO(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \ 656 { \ 657 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \ 658 .name = xname, \ 659 .index = xindex, \ 660 .info = snd_at73c213_stereo_info, \ 661 .get = snd_at73c213_stereo_get, \ 662 .put = snd_at73c213_stereo_put, \ 663 .private_value = (left_reg | (right_reg << 8) \ 664 | (shift_left << 16) | (shift_right << 19) \ 665 | (mask << 24) | (invert << 22)) \ 666 } 667 668 static struct snd_kcontrol_new snd_at73c213_controls[] = { 669 AT73C213_STEREO("Master Playback Volume", 0, DAC_LMPG, DAC_RMPG, 0, 0, 0x1f, 1), 670 AT73C213_STEREO("Master Playback Switch", 0, DAC_LMPG, DAC_RMPG, 5, 5, 1, 1), 671 AT73C213_STEREO("PCM Playback Volume", 0, DAC_LLOG, DAC_RLOG, 0, 0, 0x1f, 1), 672 AT73C213_STEREO("PCM Playback Switch", 0, DAC_LLOG, DAC_RLOG, 5, 5, 1, 1), 673 AT73C213_MONO_SWITCH("Mono PA Playback Switch", 0, DAC_CTRL, DAC_CTRL_ONPADRV, 674 0x01, 0), 675 { 676 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 677 .name = "PA Playback Volume", 678 .index = 0, 679 .info = snd_at73c213_pa_volume_info, 680 .get = snd_at73c213_mono_get, 681 .put = snd_at73c213_mono_put, 682 .private_value = PA_CTRL | (PA_CTRL_APAGAIN << 8) | \ 683 (0x0f << 16) | (1 << 24), 684 }, 685 AT73C213_MONO_SWITCH("PA High Gain Playback Switch", 0, PA_CTRL, PA_CTRL_APALP, 686 0x01, 1), 687 AT73C213_MONO_SWITCH("PA Playback Switch", 0, PA_CTRL, PA_CTRL_APAON, 0x01, 0), 688 { 689 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 690 .name = "Aux Capture Volume", 691 .index = 0, 692 .info = snd_at73c213_aux_capture_volume_info, 693 .get = snd_at73c213_mono_get, 694 .put = snd_at73c213_mono_put, 695 .private_value = DAC_AUXG | (0 << 8) | (0x1f << 16) | (1 << 24), 696 }, 697 AT73C213_MONO_SWITCH("Aux Capture Switch", 0, DAC_CTRL, DAC_CTRL_ONAUXIN, 698 0x01, 0), 699 { 700 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 701 .name = "Line Capture Volume", 702 .index = 0, 703 .info = snd_at73c213_line_capture_volume_info, 704 .get = snd_at73c213_stereo_get, 705 .put = snd_at73c213_stereo_put, 706 .private_value = DAC_LLIG | (DAC_RLIG << 8) | (0 << 16) | (0 << 19) 707 | (0x1f << 24) | (1 << 22), 708 }, 709 AT73C213_MONO_SWITCH("Line Capture Switch", 0, DAC_CTRL, 0, 0x03, 0), 710 }; 711 712 static int snd_at73c213_mixer(struct snd_at73c213 *chip) 713 { 714 struct snd_card *card; 715 int errval, idx; 716 717 if (chip == NULL || chip->pcm == NULL) 718 return -EINVAL; 719 720 card = chip->card; 721 722 strcpy(card->mixername, chip->pcm->name); 723 724 for (idx = 0; idx < ARRAY_SIZE(snd_at73c213_controls); idx++) { 725 errval = snd_ctl_add(card, 726 snd_ctl_new1(&snd_at73c213_controls[idx], 727 chip)); 728 if (errval < 0) 729 goto cleanup; 730 } 731 732 return 0; 733 734 cleanup: 735 for (idx = 1; idx < ARRAY_SIZE(snd_at73c213_controls) + 1; idx++) { 736 struct snd_kcontrol *kctl; 737 kctl = snd_ctl_find_numid(card, idx); 738 if (kctl) 739 snd_ctl_remove(card, kctl); 740 } 741 return errval; 742 } 743 744 /* 745 * Device functions 746 */ 747 static int snd_at73c213_ssc_init(struct snd_at73c213 *chip) 748 { 749 /* 750 * Continuous clock output. 751 * Starts on falling TF. 752 * Delay 1 cycle (1 bit). 753 * Periode is 16 bit (16 - 1). 754 */ 755 ssc_writel(chip->ssc->regs, TCMR, 756 SSC_BF(TCMR_CKO, 1) 757 | SSC_BF(TCMR_START, 4) 758 | SSC_BF(TCMR_STTDLY, 1) 759 | SSC_BF(TCMR_PERIOD, 16 - 1)); 760 /* 761 * Data length is 16 bit (16 - 1). 762 * Transmit MSB first. 763 * Transmit 2 words each transfer. 764 * Frame sync length is 16 bit (16 - 1). 765 * Frame starts on negative pulse. 766 */ 767 ssc_writel(chip->ssc->regs, TFMR, 768 SSC_BF(TFMR_DATLEN, 16 - 1) 769 | SSC_BIT(TFMR_MSBF) 770 | SSC_BF(TFMR_DATNB, 1) 771 | SSC_BF(TFMR_FSLEN, 16 - 1) 772 | SSC_BF(TFMR_FSOS, 1)); 773 774 return 0; 775 } 776 777 static int snd_at73c213_chip_init(struct snd_at73c213 *chip) 778 { 779 int retval; 780 unsigned char dac_ctrl = 0; 781 782 retval = snd_at73c213_set_bitrate(chip); 783 if (retval) 784 goto out; 785 786 /* Enable DAC master clock. */ 787 clk_enable(chip->board->dac_clk); 788 789 /* Initialize at73c213 on SPI bus. */ 790 retval = snd_at73c213_write_reg(chip, DAC_RST, 0x04); 791 if (retval) 792 goto out_clk; 793 msleep(1); 794 retval = snd_at73c213_write_reg(chip, DAC_RST, 0x03); 795 if (retval) 796 goto out_clk; 797 798 /* Precharge everything. */ 799 retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0xff); 800 if (retval) 801 goto out_clk; 802 retval = snd_at73c213_write_reg(chip, PA_CTRL, (1<<PA_CTRL_APAPRECH)); 803 if (retval) 804 goto out_clk; 805 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 806 (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR)); 807 if (retval) 808 goto out_clk; 809 810 msleep(50); 811 812 /* Stop precharging PA. */ 813 retval = snd_at73c213_write_reg(chip, PA_CTRL, 814 (1<<PA_CTRL_APALP) | 0x0f); 815 if (retval) 816 goto out_clk; 817 818 msleep(450); 819 820 /* Stop precharging DAC, turn on master power. */ 821 retval = snd_at73c213_write_reg(chip, DAC_PRECH, (1<<DAC_PRECH_ONMSTR)); 822 if (retval) 823 goto out_clk; 824 825 msleep(1); 826 827 /* Turn on DAC. */ 828 dac_ctrl = (1<<DAC_CTRL_ONDACL) | (1<<DAC_CTRL_ONDACR) 829 | (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR); 830 831 retval = snd_at73c213_write_reg(chip, DAC_CTRL, dac_ctrl); 832 if (retval) 833 goto out_clk; 834 835 /* Mute sound. */ 836 retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f); 837 if (retval) 838 goto out_clk; 839 retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f); 840 if (retval) 841 goto out_clk; 842 retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f); 843 if (retval) 844 goto out_clk; 845 retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f); 846 if (retval) 847 goto out_clk; 848 retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11); 849 if (retval) 850 goto out_clk; 851 retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11); 852 if (retval) 853 goto out_clk; 854 retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11); 855 if (retval) 856 goto out_clk; 857 858 /* Enable I2S device, i.e. clock output. */ 859 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN)); 860 861 goto out; 862 863 out_clk: 864 clk_disable(chip->board->dac_clk); 865 out: 866 return retval; 867 } 868 869 static int snd_at73c213_dev_free(struct snd_device *device) 870 { 871 struct snd_at73c213 *chip = device->device_data; 872 873 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS)); 874 if (chip->irq >= 0) { 875 free_irq(chip->irq, chip); 876 chip->irq = -1; 877 } 878 879 return 0; 880 } 881 882 static int snd_at73c213_dev_init(struct snd_card *card, 883 struct spi_device *spi) 884 { 885 static struct snd_device_ops ops = { 886 .dev_free = snd_at73c213_dev_free, 887 }; 888 struct snd_at73c213 *chip = get_chip(card); 889 int irq, retval; 890 891 irq = chip->ssc->irq; 892 if (irq < 0) 893 return irq; 894 895 spin_lock_init(&chip->lock); 896 mutex_init(&chip->mixer_lock); 897 chip->card = card; 898 chip->irq = -1; 899 900 clk_enable(chip->ssc->clk); 901 902 retval = request_irq(irq, snd_at73c213_interrupt, 0, "at73c213", chip); 903 if (retval) { 904 dev_dbg(&chip->spi->dev, "unable to request irq %d\n", irq); 905 goto out; 906 } 907 chip->irq = irq; 908 909 memcpy(&chip->reg_image, &snd_at73c213_original_image, 910 sizeof(snd_at73c213_original_image)); 911 912 retval = snd_at73c213_ssc_init(chip); 913 if (retval) 914 goto out_irq; 915 916 retval = snd_at73c213_chip_init(chip); 917 if (retval) 918 goto out_irq; 919 920 retval = snd_at73c213_pcm_new(chip, 0); 921 if (retval) 922 goto out_irq; 923 924 retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops); 925 if (retval) 926 goto out_irq; 927 928 retval = snd_at73c213_mixer(chip); 929 if (retval) 930 goto out_snd_dev; 931 932 goto out; 933 934 out_snd_dev: 935 snd_device_free(card, chip); 936 out_irq: 937 free_irq(chip->irq, chip); 938 chip->irq = -1; 939 out: 940 clk_disable(chip->ssc->clk); 941 942 return retval; 943 } 944 945 static int snd_at73c213_probe(struct spi_device *spi) 946 { 947 struct snd_card *card; 948 struct snd_at73c213 *chip; 949 struct at73c213_board_info *board; 950 int retval; 951 char id[16]; 952 953 board = spi->dev.platform_data; 954 if (!board) { 955 dev_dbg(&spi->dev, "no platform_data\n"); 956 return -ENXIO; 957 } 958 959 if (!board->dac_clk) { 960 dev_dbg(&spi->dev, "no DAC clk\n"); 961 return -ENXIO; 962 } 963 964 if (IS_ERR(board->dac_clk)) { 965 dev_dbg(&spi->dev, "no DAC clk\n"); 966 return PTR_ERR(board->dac_clk); 967 } 968 969 /* Allocate "card" using some unused identifiers. */ 970 snprintf(id, sizeof id, "at73c213_%d", board->ssc_id); 971 retval = snd_card_new(&spi->dev, -1, id, THIS_MODULE, 972 sizeof(struct snd_at73c213), &card); 973 if (retval < 0) 974 goto out; 975 976 chip = card->private_data; 977 chip->spi = spi; 978 chip->board = board; 979 980 chip->ssc = ssc_request(board->ssc_id); 981 if (IS_ERR(chip->ssc)) { 982 dev_dbg(&spi->dev, "could not get ssc%d device\n", 983 board->ssc_id); 984 retval = PTR_ERR(chip->ssc); 985 goto out_card; 986 } 987 988 retval = snd_at73c213_dev_init(card, spi); 989 if (retval) 990 goto out_ssc; 991 992 strcpy(card->driver, "at73c213"); 993 strcpy(card->shortname, board->shortname); 994 sprintf(card->longname, "%s on irq %d", card->shortname, chip->irq); 995 996 retval = snd_card_register(card); 997 if (retval) 998 goto out_ssc; 999 1000 dev_set_drvdata(&spi->dev, card); 1001 1002 goto out; 1003 1004 out_ssc: 1005 ssc_free(chip->ssc); 1006 out_card: 1007 snd_card_free(card); 1008 out: 1009 return retval; 1010 } 1011 1012 static int snd_at73c213_remove(struct spi_device *spi) 1013 { 1014 struct snd_card *card = dev_get_drvdata(&spi->dev); 1015 struct snd_at73c213 *chip = card->private_data; 1016 int retval; 1017 1018 /* Stop playback. */ 1019 clk_enable(chip->ssc->clk); 1020 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS)); 1021 clk_disable(chip->ssc->clk); 1022 1023 /* Mute sound. */ 1024 retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f); 1025 if (retval) 1026 goto out; 1027 retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f); 1028 if (retval) 1029 goto out; 1030 retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f); 1031 if (retval) 1032 goto out; 1033 retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f); 1034 if (retval) 1035 goto out; 1036 retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11); 1037 if (retval) 1038 goto out; 1039 retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11); 1040 if (retval) 1041 goto out; 1042 retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11); 1043 if (retval) 1044 goto out; 1045 1046 /* Turn off PA. */ 1047 retval = snd_at73c213_write_reg(chip, PA_CTRL, 1048 chip->reg_image[PA_CTRL] | 0x0f); 1049 if (retval) 1050 goto out; 1051 msleep(10); 1052 retval = snd_at73c213_write_reg(chip, PA_CTRL, 1053 (1 << PA_CTRL_APALP) | 0x0f); 1054 if (retval) 1055 goto out; 1056 1057 /* Turn off external DAC. */ 1058 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x0c); 1059 if (retval) 1060 goto out; 1061 msleep(2); 1062 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x00); 1063 if (retval) 1064 goto out; 1065 1066 /* Turn off master power. */ 1067 retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0x00); 1068 if (retval) 1069 goto out; 1070 1071 out: 1072 /* Stop DAC master clock. */ 1073 clk_disable(chip->board->dac_clk); 1074 1075 ssc_free(chip->ssc); 1076 snd_card_free(card); 1077 1078 return 0; 1079 } 1080 1081 #ifdef CONFIG_PM_SLEEP 1082 1083 static int snd_at73c213_suspend(struct device *dev) 1084 { 1085 struct snd_card *card = dev_get_drvdata(dev); 1086 struct snd_at73c213 *chip = card->private_data; 1087 1088 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS)); 1089 clk_disable(chip->ssc->clk); 1090 clk_disable(chip->board->dac_clk); 1091 1092 return 0; 1093 } 1094 1095 static int snd_at73c213_resume(struct device *dev) 1096 { 1097 struct snd_card *card = dev_get_drvdata(dev); 1098 struct snd_at73c213 *chip = card->private_data; 1099 1100 clk_enable(chip->board->dac_clk); 1101 clk_enable(chip->ssc->clk); 1102 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN)); 1103 1104 return 0; 1105 } 1106 1107 static SIMPLE_DEV_PM_OPS(at73c213_pm_ops, snd_at73c213_suspend, 1108 snd_at73c213_resume); 1109 #define AT73C213_PM_OPS (&at73c213_pm_ops) 1110 1111 #else 1112 #define AT73C213_PM_OPS NULL 1113 #endif 1114 1115 static struct spi_driver at73c213_driver = { 1116 .driver = { 1117 .name = "at73c213", 1118 .pm = AT73C213_PM_OPS, 1119 }, 1120 .probe = snd_at73c213_probe, 1121 .remove = snd_at73c213_remove, 1122 }; 1123 1124 module_spi_driver(at73c213_driver); 1125 1126 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); 1127 MODULE_DESCRIPTION("Sound driver for AT73C213 with Atmel SSC"); 1128 MODULE_LICENSE("GPL"); 1129