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 const 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 0; 246 } 247 248 static int snd_at73c213_pcm_prepare(struct snd_pcm_substream *substream) 249 { 250 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 251 struct snd_pcm_runtime *runtime = substream->runtime; 252 int block_size; 253 254 block_size = frames_to_bytes(runtime, runtime->period_size); 255 256 chip->period = 0; 257 258 ssc_writel(chip->ssc->regs, PDC_TPR, 259 (long)runtime->dma_addr); 260 ssc_writel(chip->ssc->regs, PDC_TCR, 261 runtime->period_size * runtime->channels); 262 ssc_writel(chip->ssc->regs, PDC_TNPR, 263 (long)runtime->dma_addr + block_size); 264 ssc_writel(chip->ssc->regs, PDC_TNCR, 265 runtime->period_size * runtime->channels); 266 267 return 0; 268 } 269 270 static int snd_at73c213_pcm_trigger(struct snd_pcm_substream *substream, 271 int cmd) 272 { 273 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 274 int retval = 0; 275 276 spin_lock(&chip->lock); 277 278 switch (cmd) { 279 case SNDRV_PCM_TRIGGER_START: 280 ssc_writel(chip->ssc->regs, IER, SSC_BIT(IER_ENDTX)); 281 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTEN)); 282 break; 283 case SNDRV_PCM_TRIGGER_STOP: 284 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTDIS)); 285 ssc_writel(chip->ssc->regs, IDR, SSC_BIT(IDR_ENDTX)); 286 break; 287 default: 288 dev_dbg(&chip->spi->dev, "spurious command %x\n", cmd); 289 retval = -EINVAL; 290 break; 291 } 292 293 spin_unlock(&chip->lock); 294 295 return retval; 296 } 297 298 static snd_pcm_uframes_t 299 snd_at73c213_pcm_pointer(struct snd_pcm_substream *substream) 300 { 301 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 302 struct snd_pcm_runtime *runtime = substream->runtime; 303 snd_pcm_uframes_t pos; 304 unsigned long bytes; 305 306 bytes = ssc_readl(chip->ssc->regs, PDC_TPR) 307 - (unsigned long)runtime->dma_addr; 308 309 pos = bytes_to_frames(runtime, bytes); 310 if (pos >= runtime->buffer_size) 311 pos -= runtime->buffer_size; 312 313 return pos; 314 } 315 316 static const struct snd_pcm_ops at73c213_playback_ops = { 317 .open = snd_at73c213_pcm_open, 318 .close = snd_at73c213_pcm_close, 319 .hw_params = snd_at73c213_pcm_hw_params, 320 .prepare = snd_at73c213_pcm_prepare, 321 .trigger = snd_at73c213_pcm_trigger, 322 .pointer = snd_at73c213_pcm_pointer, 323 }; 324 325 static int snd_at73c213_pcm_new(struct snd_at73c213 *chip, int device) 326 { 327 struct snd_pcm *pcm; 328 int retval; 329 330 retval = snd_pcm_new(chip->card, chip->card->shortname, 331 device, 1, 0, &pcm); 332 if (retval < 0) 333 goto out; 334 335 pcm->private_data = chip; 336 pcm->info_flags = SNDRV_PCM_INFO_BLOCK_TRANSFER; 337 strcpy(pcm->name, "at73c213"); 338 chip->pcm = pcm; 339 340 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &at73c213_playback_ops); 341 342 snd_pcm_set_managed_buffer_all(chip->pcm, 343 SNDRV_DMA_TYPE_DEV, &chip->ssc->pdev->dev, 344 64 * 1024, 64 * 1024); 345 out: 346 return retval; 347 } 348 349 static irqreturn_t snd_at73c213_interrupt(int irq, void *dev_id) 350 { 351 struct snd_at73c213 *chip = dev_id; 352 struct snd_pcm_runtime *runtime = chip->substream->runtime; 353 u32 status; 354 int offset; 355 int block_size; 356 int next_period; 357 int retval = IRQ_NONE; 358 359 spin_lock(&chip->lock); 360 361 block_size = frames_to_bytes(runtime, runtime->period_size); 362 status = ssc_readl(chip->ssc->regs, IMR); 363 364 if (status & SSC_BIT(IMR_ENDTX)) { 365 chip->period++; 366 if (chip->period == runtime->periods) 367 chip->period = 0; 368 next_period = chip->period + 1; 369 if (next_period == runtime->periods) 370 next_period = 0; 371 372 offset = block_size * next_period; 373 374 ssc_writel(chip->ssc->regs, PDC_TNPR, 375 (long)runtime->dma_addr + offset); 376 ssc_writel(chip->ssc->regs, PDC_TNCR, 377 runtime->period_size * runtime->channels); 378 retval = IRQ_HANDLED; 379 } 380 381 ssc_readl(chip->ssc->regs, IMR); 382 spin_unlock(&chip->lock); 383 384 if (status & SSC_BIT(IMR_ENDTX)) 385 snd_pcm_period_elapsed(chip->substream); 386 387 return retval; 388 } 389 390 /* 391 * Mixer functions. 392 */ 393 static int snd_at73c213_mono_get(struct snd_kcontrol *kcontrol, 394 struct snd_ctl_elem_value *ucontrol) 395 { 396 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 397 int reg = kcontrol->private_value & 0xff; 398 int shift = (kcontrol->private_value >> 8) & 0xff; 399 int mask = (kcontrol->private_value >> 16) & 0xff; 400 int invert = (kcontrol->private_value >> 24) & 0xff; 401 402 mutex_lock(&chip->mixer_lock); 403 404 ucontrol->value.integer.value[0] = 405 (chip->reg_image[reg] >> shift) & mask; 406 407 if (invert) 408 ucontrol->value.integer.value[0] = 409 mask - ucontrol->value.integer.value[0]; 410 411 mutex_unlock(&chip->mixer_lock); 412 413 return 0; 414 } 415 416 static int snd_at73c213_mono_put(struct snd_kcontrol *kcontrol, 417 struct snd_ctl_elem_value *ucontrol) 418 { 419 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 420 int reg = kcontrol->private_value & 0xff; 421 int shift = (kcontrol->private_value >> 8) & 0xff; 422 int mask = (kcontrol->private_value >> 16) & 0xff; 423 int invert = (kcontrol->private_value >> 24) & 0xff; 424 int change, retval; 425 unsigned short val; 426 427 val = (ucontrol->value.integer.value[0] & mask); 428 if (invert) 429 val = mask - val; 430 val <<= shift; 431 432 mutex_lock(&chip->mixer_lock); 433 434 val = (chip->reg_image[reg] & ~(mask << shift)) | val; 435 change = val != chip->reg_image[reg]; 436 retval = snd_at73c213_write_reg(chip, reg, val); 437 438 mutex_unlock(&chip->mixer_lock); 439 440 if (retval) 441 return retval; 442 443 return change; 444 } 445 446 static int snd_at73c213_stereo_info(struct snd_kcontrol *kcontrol, 447 struct snd_ctl_elem_info *uinfo) 448 { 449 int mask = (kcontrol->private_value >> 24) & 0xff; 450 451 if (mask == 1) 452 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; 453 else 454 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 455 456 uinfo->count = 2; 457 uinfo->value.integer.min = 0; 458 uinfo->value.integer.max = mask; 459 460 return 0; 461 } 462 463 static int snd_at73c213_stereo_get(struct snd_kcontrol *kcontrol, 464 struct snd_ctl_elem_value *ucontrol) 465 { 466 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 467 int left_reg = kcontrol->private_value & 0xff; 468 int right_reg = (kcontrol->private_value >> 8) & 0xff; 469 int shift_left = (kcontrol->private_value >> 16) & 0x07; 470 int shift_right = (kcontrol->private_value >> 19) & 0x07; 471 int mask = (kcontrol->private_value >> 24) & 0xff; 472 int invert = (kcontrol->private_value >> 22) & 1; 473 474 mutex_lock(&chip->mixer_lock); 475 476 ucontrol->value.integer.value[0] = 477 (chip->reg_image[left_reg] >> shift_left) & mask; 478 ucontrol->value.integer.value[1] = 479 (chip->reg_image[right_reg] >> shift_right) & mask; 480 481 if (invert) { 482 ucontrol->value.integer.value[0] = 483 mask - ucontrol->value.integer.value[0]; 484 ucontrol->value.integer.value[1] = 485 mask - ucontrol->value.integer.value[1]; 486 } 487 488 mutex_unlock(&chip->mixer_lock); 489 490 return 0; 491 } 492 493 static int snd_at73c213_stereo_put(struct snd_kcontrol *kcontrol, 494 struct snd_ctl_elem_value *ucontrol) 495 { 496 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 497 int left_reg = kcontrol->private_value & 0xff; 498 int right_reg = (kcontrol->private_value >> 8) & 0xff; 499 int shift_left = (kcontrol->private_value >> 16) & 0x07; 500 int shift_right = (kcontrol->private_value >> 19) & 0x07; 501 int mask = (kcontrol->private_value >> 24) & 0xff; 502 int invert = (kcontrol->private_value >> 22) & 1; 503 int change, retval; 504 unsigned short val1, val2; 505 506 val1 = ucontrol->value.integer.value[0] & mask; 507 val2 = ucontrol->value.integer.value[1] & mask; 508 if (invert) { 509 val1 = mask - val1; 510 val2 = mask - val2; 511 } 512 val1 <<= shift_left; 513 val2 <<= shift_right; 514 515 mutex_lock(&chip->mixer_lock); 516 517 val1 = (chip->reg_image[left_reg] & ~(mask << shift_left)) | val1; 518 val2 = (chip->reg_image[right_reg] & ~(mask << shift_right)) | val2; 519 change = val1 != chip->reg_image[left_reg] 520 || val2 != chip->reg_image[right_reg]; 521 retval = snd_at73c213_write_reg(chip, left_reg, val1); 522 if (retval) { 523 mutex_unlock(&chip->mixer_lock); 524 goto out; 525 } 526 retval = snd_at73c213_write_reg(chip, right_reg, val2); 527 if (retval) { 528 mutex_unlock(&chip->mixer_lock); 529 goto out; 530 } 531 532 mutex_unlock(&chip->mixer_lock); 533 534 return change; 535 536 out: 537 return retval; 538 } 539 540 #define snd_at73c213_mono_switch_info snd_ctl_boolean_mono_info 541 542 static int snd_at73c213_mono_switch_get(struct snd_kcontrol *kcontrol, 543 struct snd_ctl_elem_value *ucontrol) 544 { 545 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 546 int reg = kcontrol->private_value & 0xff; 547 int shift = (kcontrol->private_value >> 8) & 0xff; 548 int invert = (kcontrol->private_value >> 24) & 0xff; 549 550 mutex_lock(&chip->mixer_lock); 551 552 ucontrol->value.integer.value[0] = 553 (chip->reg_image[reg] >> shift) & 0x01; 554 555 if (invert) 556 ucontrol->value.integer.value[0] = 557 0x01 - ucontrol->value.integer.value[0]; 558 559 mutex_unlock(&chip->mixer_lock); 560 561 return 0; 562 } 563 564 static int snd_at73c213_mono_switch_put(struct snd_kcontrol *kcontrol, 565 struct snd_ctl_elem_value *ucontrol) 566 { 567 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 568 int reg = kcontrol->private_value & 0xff; 569 int shift = (kcontrol->private_value >> 8) & 0xff; 570 int mask = (kcontrol->private_value >> 16) & 0xff; 571 int invert = (kcontrol->private_value >> 24) & 0xff; 572 int change, retval; 573 unsigned short val; 574 575 if (ucontrol->value.integer.value[0]) 576 val = mask; 577 else 578 val = 0; 579 580 if (invert) 581 val = mask - val; 582 val <<= shift; 583 584 mutex_lock(&chip->mixer_lock); 585 586 val |= (chip->reg_image[reg] & ~(mask << shift)); 587 change = val != chip->reg_image[reg]; 588 589 retval = snd_at73c213_write_reg(chip, reg, val); 590 591 mutex_unlock(&chip->mixer_lock); 592 593 if (retval) 594 return retval; 595 596 return change; 597 } 598 599 static int snd_at73c213_pa_volume_info(struct snd_kcontrol *kcontrol, 600 struct snd_ctl_elem_info *uinfo) 601 { 602 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 603 uinfo->count = 1; 604 uinfo->value.integer.min = 0; 605 uinfo->value.integer.max = ((kcontrol->private_value >> 16) & 0xff) - 1; 606 607 return 0; 608 } 609 610 static int snd_at73c213_line_capture_volume_info( 611 struct snd_kcontrol *kcontrol, 612 struct snd_ctl_elem_info *uinfo) 613 { 614 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 615 uinfo->count = 2; 616 /* When inverted will give values 0x10001 => 0. */ 617 uinfo->value.integer.min = 14; 618 uinfo->value.integer.max = 31; 619 620 return 0; 621 } 622 623 static int snd_at73c213_aux_capture_volume_info( 624 struct snd_kcontrol *kcontrol, 625 struct snd_ctl_elem_info *uinfo) 626 { 627 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 628 uinfo->count = 1; 629 /* When inverted will give values 0x10001 => 0. */ 630 uinfo->value.integer.min = 14; 631 uinfo->value.integer.max = 31; 632 633 return 0; 634 } 635 636 #define AT73C213_MONO_SWITCH(xname, xindex, reg, shift, mask, invert) \ 637 { \ 638 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \ 639 .name = xname, \ 640 .index = xindex, \ 641 .info = snd_at73c213_mono_switch_info, \ 642 .get = snd_at73c213_mono_switch_get, \ 643 .put = snd_at73c213_mono_switch_put, \ 644 .private_value = (reg | (shift << 8) | (mask << 16) | (invert << 24)) \ 645 } 646 647 #define AT73C213_STEREO(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \ 648 { \ 649 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \ 650 .name = xname, \ 651 .index = xindex, \ 652 .info = snd_at73c213_stereo_info, \ 653 .get = snd_at73c213_stereo_get, \ 654 .put = snd_at73c213_stereo_put, \ 655 .private_value = (left_reg | (right_reg << 8) \ 656 | (shift_left << 16) | (shift_right << 19) \ 657 | (mask << 24) | (invert << 22)) \ 658 } 659 660 static const struct snd_kcontrol_new snd_at73c213_controls[] = { 661 AT73C213_STEREO("Master Playback Volume", 0, DAC_LMPG, DAC_RMPG, 0, 0, 0x1f, 1), 662 AT73C213_STEREO("Master Playback Switch", 0, DAC_LMPG, DAC_RMPG, 5, 5, 1, 1), 663 AT73C213_STEREO("PCM Playback Volume", 0, DAC_LLOG, DAC_RLOG, 0, 0, 0x1f, 1), 664 AT73C213_STEREO("PCM Playback Switch", 0, DAC_LLOG, DAC_RLOG, 5, 5, 1, 1), 665 AT73C213_MONO_SWITCH("Mono PA Playback Switch", 0, DAC_CTRL, DAC_CTRL_ONPADRV, 666 0x01, 0), 667 { 668 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 669 .name = "PA Playback Volume", 670 .index = 0, 671 .info = snd_at73c213_pa_volume_info, 672 .get = snd_at73c213_mono_get, 673 .put = snd_at73c213_mono_put, 674 .private_value = PA_CTRL | (PA_CTRL_APAGAIN << 8) | \ 675 (0x0f << 16) | (1 << 24), 676 }, 677 AT73C213_MONO_SWITCH("PA High Gain Playback Switch", 0, PA_CTRL, PA_CTRL_APALP, 678 0x01, 1), 679 AT73C213_MONO_SWITCH("PA Playback Switch", 0, PA_CTRL, PA_CTRL_APAON, 0x01, 0), 680 { 681 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 682 .name = "Aux Capture Volume", 683 .index = 0, 684 .info = snd_at73c213_aux_capture_volume_info, 685 .get = snd_at73c213_mono_get, 686 .put = snd_at73c213_mono_put, 687 .private_value = DAC_AUXG | (0 << 8) | (0x1f << 16) | (1 << 24), 688 }, 689 AT73C213_MONO_SWITCH("Aux Capture Switch", 0, DAC_CTRL, DAC_CTRL_ONAUXIN, 690 0x01, 0), 691 { 692 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 693 .name = "Line Capture Volume", 694 .index = 0, 695 .info = snd_at73c213_line_capture_volume_info, 696 .get = snd_at73c213_stereo_get, 697 .put = snd_at73c213_stereo_put, 698 .private_value = DAC_LLIG | (DAC_RLIG << 8) | (0 << 16) | (0 << 19) 699 | (0x1f << 24) | (1 << 22), 700 }, 701 AT73C213_MONO_SWITCH("Line Capture Switch", 0, DAC_CTRL, 0, 0x03, 0), 702 }; 703 704 static int snd_at73c213_mixer(struct snd_at73c213 *chip) 705 { 706 struct snd_card *card; 707 int errval, idx; 708 709 if (chip == NULL || chip->pcm == NULL) 710 return -EINVAL; 711 712 card = chip->card; 713 714 strcpy(card->mixername, chip->pcm->name); 715 716 for (idx = 0; idx < ARRAY_SIZE(snd_at73c213_controls); idx++) { 717 errval = snd_ctl_add(card, 718 snd_ctl_new1(&snd_at73c213_controls[idx], 719 chip)); 720 if (errval < 0) 721 goto cleanup; 722 } 723 724 return 0; 725 726 cleanup: 727 for (idx = 1; idx < ARRAY_SIZE(snd_at73c213_controls) + 1; idx++) { 728 struct snd_kcontrol *kctl; 729 kctl = snd_ctl_find_numid(card, idx); 730 if (kctl) 731 snd_ctl_remove(card, kctl); 732 } 733 return errval; 734 } 735 736 /* 737 * Device functions 738 */ 739 static int snd_at73c213_ssc_init(struct snd_at73c213 *chip) 740 { 741 /* 742 * Continuous clock output. 743 * Starts on falling TF. 744 * Delay 1 cycle (1 bit). 745 * Periode is 16 bit (16 - 1). 746 */ 747 ssc_writel(chip->ssc->regs, TCMR, 748 SSC_BF(TCMR_CKO, 1) 749 | SSC_BF(TCMR_START, 4) 750 | SSC_BF(TCMR_STTDLY, 1) 751 | SSC_BF(TCMR_PERIOD, 16 - 1)); 752 /* 753 * Data length is 16 bit (16 - 1). 754 * Transmit MSB first. 755 * Transmit 2 words each transfer. 756 * Frame sync length is 16 bit (16 - 1). 757 * Frame starts on negative pulse. 758 */ 759 ssc_writel(chip->ssc->regs, TFMR, 760 SSC_BF(TFMR_DATLEN, 16 - 1) 761 | SSC_BIT(TFMR_MSBF) 762 | SSC_BF(TFMR_DATNB, 1) 763 | SSC_BF(TFMR_FSLEN, 16 - 1) 764 | SSC_BF(TFMR_FSOS, 1)); 765 766 return 0; 767 } 768 769 static int snd_at73c213_chip_init(struct snd_at73c213 *chip) 770 { 771 int retval; 772 unsigned char dac_ctrl = 0; 773 774 retval = snd_at73c213_set_bitrate(chip); 775 if (retval) 776 goto out; 777 778 /* Enable DAC master clock. */ 779 clk_enable(chip->board->dac_clk); 780 781 /* Initialize at73c213 on SPI bus. */ 782 retval = snd_at73c213_write_reg(chip, DAC_RST, 0x04); 783 if (retval) 784 goto out_clk; 785 msleep(1); 786 retval = snd_at73c213_write_reg(chip, DAC_RST, 0x03); 787 if (retval) 788 goto out_clk; 789 790 /* Precharge everything. */ 791 retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0xff); 792 if (retval) 793 goto out_clk; 794 retval = snd_at73c213_write_reg(chip, PA_CTRL, (1<<PA_CTRL_APAPRECH)); 795 if (retval) 796 goto out_clk; 797 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 798 (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR)); 799 if (retval) 800 goto out_clk; 801 802 msleep(50); 803 804 /* Stop precharging PA. */ 805 retval = snd_at73c213_write_reg(chip, PA_CTRL, 806 (1<<PA_CTRL_APALP) | 0x0f); 807 if (retval) 808 goto out_clk; 809 810 msleep(450); 811 812 /* Stop precharging DAC, turn on master power. */ 813 retval = snd_at73c213_write_reg(chip, DAC_PRECH, (1<<DAC_PRECH_ONMSTR)); 814 if (retval) 815 goto out_clk; 816 817 msleep(1); 818 819 /* Turn on DAC. */ 820 dac_ctrl = (1<<DAC_CTRL_ONDACL) | (1<<DAC_CTRL_ONDACR) 821 | (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR); 822 823 retval = snd_at73c213_write_reg(chip, DAC_CTRL, dac_ctrl); 824 if (retval) 825 goto out_clk; 826 827 /* Mute sound. */ 828 retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f); 829 if (retval) 830 goto out_clk; 831 retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f); 832 if (retval) 833 goto out_clk; 834 retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f); 835 if (retval) 836 goto out_clk; 837 retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f); 838 if (retval) 839 goto out_clk; 840 retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11); 841 if (retval) 842 goto out_clk; 843 retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11); 844 if (retval) 845 goto out_clk; 846 retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11); 847 if (retval) 848 goto out_clk; 849 850 /* Enable I2S device, i.e. clock output. */ 851 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN)); 852 853 goto out; 854 855 out_clk: 856 clk_disable(chip->board->dac_clk); 857 out: 858 return retval; 859 } 860 861 static int snd_at73c213_dev_free(struct snd_device *device) 862 { 863 struct snd_at73c213 *chip = device->device_data; 864 865 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS)); 866 if (chip->irq >= 0) { 867 free_irq(chip->irq, chip); 868 chip->irq = -1; 869 } 870 871 return 0; 872 } 873 874 static int snd_at73c213_dev_init(struct snd_card *card, 875 struct spi_device *spi) 876 { 877 static const struct snd_device_ops ops = { 878 .dev_free = snd_at73c213_dev_free, 879 }; 880 struct snd_at73c213 *chip = get_chip(card); 881 int irq, retval; 882 883 irq = chip->ssc->irq; 884 if (irq < 0) 885 return irq; 886 887 spin_lock_init(&chip->lock); 888 mutex_init(&chip->mixer_lock); 889 chip->card = card; 890 chip->irq = -1; 891 892 clk_enable(chip->ssc->clk); 893 894 retval = request_irq(irq, snd_at73c213_interrupt, 0, "at73c213", chip); 895 if (retval) { 896 dev_dbg(&chip->spi->dev, "unable to request irq %d\n", irq); 897 goto out; 898 } 899 chip->irq = irq; 900 901 memcpy(&chip->reg_image, &snd_at73c213_original_image, 902 sizeof(snd_at73c213_original_image)); 903 904 retval = snd_at73c213_ssc_init(chip); 905 if (retval) 906 goto out_irq; 907 908 retval = snd_at73c213_chip_init(chip); 909 if (retval) 910 goto out_irq; 911 912 retval = snd_at73c213_pcm_new(chip, 0); 913 if (retval) 914 goto out_irq; 915 916 retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops); 917 if (retval) 918 goto out_irq; 919 920 retval = snd_at73c213_mixer(chip); 921 if (retval) 922 goto out_snd_dev; 923 924 goto out; 925 926 out_snd_dev: 927 snd_device_free(card, chip); 928 out_irq: 929 free_irq(chip->irq, chip); 930 chip->irq = -1; 931 out: 932 clk_disable(chip->ssc->clk); 933 934 return retval; 935 } 936 937 static int snd_at73c213_probe(struct spi_device *spi) 938 { 939 struct snd_card *card; 940 struct snd_at73c213 *chip; 941 struct at73c213_board_info *board; 942 int retval; 943 char id[16]; 944 945 board = spi->dev.platform_data; 946 if (!board) { 947 dev_dbg(&spi->dev, "no platform_data\n"); 948 return -ENXIO; 949 } 950 951 if (!board->dac_clk) { 952 dev_dbg(&spi->dev, "no DAC clk\n"); 953 return -ENXIO; 954 } 955 956 if (IS_ERR(board->dac_clk)) { 957 dev_dbg(&spi->dev, "no DAC clk\n"); 958 return PTR_ERR(board->dac_clk); 959 } 960 961 /* Allocate "card" using some unused identifiers. */ 962 snprintf(id, sizeof id, "at73c213_%d", board->ssc_id); 963 retval = snd_card_new(&spi->dev, -1, id, THIS_MODULE, 964 sizeof(struct snd_at73c213), &card); 965 if (retval < 0) 966 goto out; 967 968 chip = card->private_data; 969 chip->spi = spi; 970 chip->board = board; 971 972 chip->ssc = ssc_request(board->ssc_id); 973 if (IS_ERR(chip->ssc)) { 974 dev_dbg(&spi->dev, "could not get ssc%d device\n", 975 board->ssc_id); 976 retval = PTR_ERR(chip->ssc); 977 goto out_card; 978 } 979 980 retval = snd_at73c213_dev_init(card, spi); 981 if (retval) 982 goto out_ssc; 983 984 strcpy(card->driver, "at73c213"); 985 strcpy(card->shortname, board->shortname); 986 sprintf(card->longname, "%s on irq %d", card->shortname, chip->irq); 987 988 retval = snd_card_register(card); 989 if (retval) 990 goto out_ssc; 991 992 dev_set_drvdata(&spi->dev, card); 993 994 goto out; 995 996 out_ssc: 997 ssc_free(chip->ssc); 998 out_card: 999 snd_card_free(card); 1000 out: 1001 return retval; 1002 } 1003 1004 static int snd_at73c213_remove(struct spi_device *spi) 1005 { 1006 struct snd_card *card = dev_get_drvdata(&spi->dev); 1007 struct snd_at73c213 *chip = card->private_data; 1008 int retval; 1009 1010 /* Stop playback. */ 1011 clk_enable(chip->ssc->clk); 1012 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS)); 1013 clk_disable(chip->ssc->clk); 1014 1015 /* Mute sound. */ 1016 retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f); 1017 if (retval) 1018 goto out; 1019 retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f); 1020 if (retval) 1021 goto out; 1022 retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f); 1023 if (retval) 1024 goto out; 1025 retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f); 1026 if (retval) 1027 goto out; 1028 retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11); 1029 if (retval) 1030 goto out; 1031 retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11); 1032 if (retval) 1033 goto out; 1034 retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11); 1035 if (retval) 1036 goto out; 1037 1038 /* Turn off PA. */ 1039 retval = snd_at73c213_write_reg(chip, PA_CTRL, 1040 chip->reg_image[PA_CTRL] | 0x0f); 1041 if (retval) 1042 goto out; 1043 msleep(10); 1044 retval = snd_at73c213_write_reg(chip, PA_CTRL, 1045 (1 << PA_CTRL_APALP) | 0x0f); 1046 if (retval) 1047 goto out; 1048 1049 /* Turn off external DAC. */ 1050 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x0c); 1051 if (retval) 1052 goto out; 1053 msleep(2); 1054 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x00); 1055 if (retval) 1056 goto out; 1057 1058 /* Turn off master power. */ 1059 retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0x00); 1060 if (retval) 1061 goto out; 1062 1063 out: 1064 /* Stop DAC master clock. */ 1065 clk_disable(chip->board->dac_clk); 1066 1067 ssc_free(chip->ssc); 1068 snd_card_free(card); 1069 1070 return 0; 1071 } 1072 1073 #ifdef CONFIG_PM_SLEEP 1074 1075 static int snd_at73c213_suspend(struct device *dev) 1076 { 1077 struct snd_card *card = dev_get_drvdata(dev); 1078 struct snd_at73c213 *chip = card->private_data; 1079 1080 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS)); 1081 clk_disable(chip->ssc->clk); 1082 clk_disable(chip->board->dac_clk); 1083 1084 return 0; 1085 } 1086 1087 static int snd_at73c213_resume(struct device *dev) 1088 { 1089 struct snd_card *card = dev_get_drvdata(dev); 1090 struct snd_at73c213 *chip = card->private_data; 1091 1092 clk_enable(chip->board->dac_clk); 1093 clk_enable(chip->ssc->clk); 1094 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN)); 1095 1096 return 0; 1097 } 1098 1099 static SIMPLE_DEV_PM_OPS(at73c213_pm_ops, snd_at73c213_suspend, 1100 snd_at73c213_resume); 1101 #define AT73C213_PM_OPS (&at73c213_pm_ops) 1102 1103 #else 1104 #define AT73C213_PM_OPS NULL 1105 #endif 1106 1107 static struct spi_driver at73c213_driver = { 1108 .driver = { 1109 .name = "at73c213", 1110 .pm = AT73C213_PM_OPS, 1111 }, 1112 .probe = snd_at73c213_probe, 1113 .remove = snd_at73c213_remove, 1114 }; 1115 1116 module_spi_driver(at73c213_driver); 1117 1118 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); 1119 MODULE_DESCRIPTION("Sound driver for AT73C213 with Atmel SSC"); 1120 MODULE_LICENSE("GPL"); 1121