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 err = clk_enable(chip->ssc->clk); 222 if (err) 223 return err; 224 225 return 0; 226 } 227 228 static int snd_at73c213_pcm_close(struct snd_pcm_substream *substream) 229 { 230 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 231 chip->substream = NULL; 232 clk_disable(chip->ssc->clk); 233 return 0; 234 } 235 236 static int snd_at73c213_pcm_hw_params(struct snd_pcm_substream *substream, 237 struct snd_pcm_hw_params *hw_params) 238 { 239 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 240 int channels = params_channels(hw_params); 241 int val; 242 243 val = ssc_readl(chip->ssc->regs, TFMR); 244 val = SSC_BFINS(TFMR_DATNB, channels - 1, val); 245 ssc_writel(chip->ssc->regs, TFMR, val); 246 247 return 0; 248 } 249 250 static int snd_at73c213_pcm_prepare(struct snd_pcm_substream *substream) 251 { 252 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 253 struct snd_pcm_runtime *runtime = substream->runtime; 254 int block_size; 255 256 block_size = frames_to_bytes(runtime, runtime->period_size); 257 258 chip->period = 0; 259 260 ssc_writel(chip->ssc->regs, PDC_TPR, 261 (long)runtime->dma_addr); 262 ssc_writel(chip->ssc->regs, PDC_TCR, 263 runtime->period_size * runtime->channels); 264 ssc_writel(chip->ssc->regs, PDC_TNPR, 265 (long)runtime->dma_addr + block_size); 266 ssc_writel(chip->ssc->regs, PDC_TNCR, 267 runtime->period_size * runtime->channels); 268 269 return 0; 270 } 271 272 static int snd_at73c213_pcm_trigger(struct snd_pcm_substream *substream, 273 int cmd) 274 { 275 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 276 int retval = 0; 277 278 spin_lock(&chip->lock); 279 280 switch (cmd) { 281 case SNDRV_PCM_TRIGGER_START: 282 ssc_writel(chip->ssc->regs, IER, SSC_BIT(IER_ENDTX)); 283 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTEN)); 284 break; 285 case SNDRV_PCM_TRIGGER_STOP: 286 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTDIS)); 287 ssc_writel(chip->ssc->regs, IDR, SSC_BIT(IDR_ENDTX)); 288 break; 289 default: 290 dev_dbg(&chip->spi->dev, "spurious command %x\n", cmd); 291 retval = -EINVAL; 292 break; 293 } 294 295 spin_unlock(&chip->lock); 296 297 return retval; 298 } 299 300 static snd_pcm_uframes_t 301 snd_at73c213_pcm_pointer(struct snd_pcm_substream *substream) 302 { 303 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream); 304 struct snd_pcm_runtime *runtime = substream->runtime; 305 snd_pcm_uframes_t pos; 306 unsigned long bytes; 307 308 bytes = ssc_readl(chip->ssc->regs, PDC_TPR) 309 - (unsigned long)runtime->dma_addr; 310 311 pos = bytes_to_frames(runtime, bytes); 312 if (pos >= runtime->buffer_size) 313 pos -= runtime->buffer_size; 314 315 return pos; 316 } 317 318 static const struct snd_pcm_ops at73c213_playback_ops = { 319 .open = snd_at73c213_pcm_open, 320 .close = snd_at73c213_pcm_close, 321 .hw_params = snd_at73c213_pcm_hw_params, 322 .prepare = snd_at73c213_pcm_prepare, 323 .trigger = snd_at73c213_pcm_trigger, 324 .pointer = snd_at73c213_pcm_pointer, 325 }; 326 327 static int snd_at73c213_pcm_new(struct snd_at73c213 *chip, int device) 328 { 329 struct snd_pcm *pcm; 330 int retval; 331 332 retval = snd_pcm_new(chip->card, chip->card->shortname, 333 device, 1, 0, &pcm); 334 if (retval < 0) 335 goto out; 336 337 pcm->private_data = chip; 338 pcm->info_flags = SNDRV_PCM_INFO_BLOCK_TRANSFER; 339 strcpy(pcm->name, "at73c213"); 340 chip->pcm = pcm; 341 342 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &at73c213_playback_ops); 343 344 snd_pcm_set_managed_buffer_all(chip->pcm, 345 SNDRV_DMA_TYPE_DEV, &chip->ssc->pdev->dev, 346 64 * 1024, 64 * 1024); 347 out: 348 return retval; 349 } 350 351 static irqreturn_t snd_at73c213_interrupt(int irq, void *dev_id) 352 { 353 struct snd_at73c213 *chip = dev_id; 354 struct snd_pcm_runtime *runtime = chip->substream->runtime; 355 u32 status; 356 int offset; 357 int block_size; 358 int next_period; 359 int retval = IRQ_NONE; 360 361 spin_lock(&chip->lock); 362 363 block_size = frames_to_bytes(runtime, runtime->period_size); 364 status = ssc_readl(chip->ssc->regs, IMR); 365 366 if (status & SSC_BIT(IMR_ENDTX)) { 367 chip->period++; 368 if (chip->period == runtime->periods) 369 chip->period = 0; 370 next_period = chip->period + 1; 371 if (next_period == runtime->periods) 372 next_period = 0; 373 374 offset = block_size * next_period; 375 376 ssc_writel(chip->ssc->regs, PDC_TNPR, 377 (long)runtime->dma_addr + offset); 378 ssc_writel(chip->ssc->regs, PDC_TNCR, 379 runtime->period_size * runtime->channels); 380 retval = IRQ_HANDLED; 381 } 382 383 ssc_readl(chip->ssc->regs, IMR); 384 spin_unlock(&chip->lock); 385 386 if (status & SSC_BIT(IMR_ENDTX)) 387 snd_pcm_period_elapsed(chip->substream); 388 389 return retval; 390 } 391 392 /* 393 * Mixer functions. 394 */ 395 static int snd_at73c213_mono_get(struct snd_kcontrol *kcontrol, 396 struct snd_ctl_elem_value *ucontrol) 397 { 398 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 399 int reg = kcontrol->private_value & 0xff; 400 int shift = (kcontrol->private_value >> 8) & 0xff; 401 int mask = (kcontrol->private_value >> 16) & 0xff; 402 int invert = (kcontrol->private_value >> 24) & 0xff; 403 404 mutex_lock(&chip->mixer_lock); 405 406 ucontrol->value.integer.value[0] = 407 (chip->reg_image[reg] >> shift) & mask; 408 409 if (invert) 410 ucontrol->value.integer.value[0] = 411 mask - ucontrol->value.integer.value[0]; 412 413 mutex_unlock(&chip->mixer_lock); 414 415 return 0; 416 } 417 418 static int snd_at73c213_mono_put(struct snd_kcontrol *kcontrol, 419 struct snd_ctl_elem_value *ucontrol) 420 { 421 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 422 int reg = kcontrol->private_value & 0xff; 423 int shift = (kcontrol->private_value >> 8) & 0xff; 424 int mask = (kcontrol->private_value >> 16) & 0xff; 425 int invert = (kcontrol->private_value >> 24) & 0xff; 426 int change, retval; 427 unsigned short val; 428 429 val = (ucontrol->value.integer.value[0] & mask); 430 if (invert) 431 val = mask - val; 432 val <<= shift; 433 434 mutex_lock(&chip->mixer_lock); 435 436 val = (chip->reg_image[reg] & ~(mask << shift)) | val; 437 change = val != chip->reg_image[reg]; 438 retval = snd_at73c213_write_reg(chip, reg, val); 439 440 mutex_unlock(&chip->mixer_lock); 441 442 if (retval) 443 return retval; 444 445 return change; 446 } 447 448 static int snd_at73c213_stereo_info(struct snd_kcontrol *kcontrol, 449 struct snd_ctl_elem_info *uinfo) 450 { 451 int mask = (kcontrol->private_value >> 24) & 0xff; 452 453 if (mask == 1) 454 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; 455 else 456 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 457 458 uinfo->count = 2; 459 uinfo->value.integer.min = 0; 460 uinfo->value.integer.max = mask; 461 462 return 0; 463 } 464 465 static int snd_at73c213_stereo_get(struct snd_kcontrol *kcontrol, 466 struct snd_ctl_elem_value *ucontrol) 467 { 468 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 469 int left_reg = kcontrol->private_value & 0xff; 470 int right_reg = (kcontrol->private_value >> 8) & 0xff; 471 int shift_left = (kcontrol->private_value >> 16) & 0x07; 472 int shift_right = (kcontrol->private_value >> 19) & 0x07; 473 int mask = (kcontrol->private_value >> 24) & 0xff; 474 int invert = (kcontrol->private_value >> 22) & 1; 475 476 mutex_lock(&chip->mixer_lock); 477 478 ucontrol->value.integer.value[0] = 479 (chip->reg_image[left_reg] >> shift_left) & mask; 480 ucontrol->value.integer.value[1] = 481 (chip->reg_image[right_reg] >> shift_right) & mask; 482 483 if (invert) { 484 ucontrol->value.integer.value[0] = 485 mask - ucontrol->value.integer.value[0]; 486 ucontrol->value.integer.value[1] = 487 mask - ucontrol->value.integer.value[1]; 488 } 489 490 mutex_unlock(&chip->mixer_lock); 491 492 return 0; 493 } 494 495 static int snd_at73c213_stereo_put(struct snd_kcontrol *kcontrol, 496 struct snd_ctl_elem_value *ucontrol) 497 { 498 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 499 int left_reg = kcontrol->private_value & 0xff; 500 int right_reg = (kcontrol->private_value >> 8) & 0xff; 501 int shift_left = (kcontrol->private_value >> 16) & 0x07; 502 int shift_right = (kcontrol->private_value >> 19) & 0x07; 503 int mask = (kcontrol->private_value >> 24) & 0xff; 504 int invert = (kcontrol->private_value >> 22) & 1; 505 int change, retval; 506 unsigned short val1, val2; 507 508 val1 = ucontrol->value.integer.value[0] & mask; 509 val2 = ucontrol->value.integer.value[1] & mask; 510 if (invert) { 511 val1 = mask - val1; 512 val2 = mask - val2; 513 } 514 val1 <<= shift_left; 515 val2 <<= shift_right; 516 517 mutex_lock(&chip->mixer_lock); 518 519 val1 = (chip->reg_image[left_reg] & ~(mask << shift_left)) | val1; 520 val2 = (chip->reg_image[right_reg] & ~(mask << shift_right)) | val2; 521 change = val1 != chip->reg_image[left_reg] 522 || val2 != chip->reg_image[right_reg]; 523 retval = snd_at73c213_write_reg(chip, left_reg, val1); 524 if (retval) { 525 mutex_unlock(&chip->mixer_lock); 526 goto out; 527 } 528 retval = snd_at73c213_write_reg(chip, right_reg, val2); 529 if (retval) { 530 mutex_unlock(&chip->mixer_lock); 531 goto out; 532 } 533 534 mutex_unlock(&chip->mixer_lock); 535 536 return change; 537 538 out: 539 return retval; 540 } 541 542 #define snd_at73c213_mono_switch_info snd_ctl_boolean_mono_info 543 544 static int snd_at73c213_mono_switch_get(struct snd_kcontrol *kcontrol, 545 struct snd_ctl_elem_value *ucontrol) 546 { 547 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 548 int reg = kcontrol->private_value & 0xff; 549 int shift = (kcontrol->private_value >> 8) & 0xff; 550 int invert = (kcontrol->private_value >> 24) & 0xff; 551 552 mutex_lock(&chip->mixer_lock); 553 554 ucontrol->value.integer.value[0] = 555 (chip->reg_image[reg] >> shift) & 0x01; 556 557 if (invert) 558 ucontrol->value.integer.value[0] = 559 0x01 - ucontrol->value.integer.value[0]; 560 561 mutex_unlock(&chip->mixer_lock); 562 563 return 0; 564 } 565 566 static int snd_at73c213_mono_switch_put(struct snd_kcontrol *kcontrol, 567 struct snd_ctl_elem_value *ucontrol) 568 { 569 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol); 570 int reg = kcontrol->private_value & 0xff; 571 int shift = (kcontrol->private_value >> 8) & 0xff; 572 int mask = (kcontrol->private_value >> 16) & 0xff; 573 int invert = (kcontrol->private_value >> 24) & 0xff; 574 int change, retval; 575 unsigned short val; 576 577 if (ucontrol->value.integer.value[0]) 578 val = mask; 579 else 580 val = 0; 581 582 if (invert) 583 val = mask - val; 584 val <<= shift; 585 586 mutex_lock(&chip->mixer_lock); 587 588 val |= (chip->reg_image[reg] & ~(mask << shift)); 589 change = val != chip->reg_image[reg]; 590 591 retval = snd_at73c213_write_reg(chip, reg, val); 592 593 mutex_unlock(&chip->mixer_lock); 594 595 if (retval) 596 return retval; 597 598 return change; 599 } 600 601 static int snd_at73c213_pa_volume_info(struct snd_kcontrol *kcontrol, 602 struct snd_ctl_elem_info *uinfo) 603 { 604 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 605 uinfo->count = 1; 606 uinfo->value.integer.min = 0; 607 uinfo->value.integer.max = ((kcontrol->private_value >> 16) & 0xff) - 1; 608 609 return 0; 610 } 611 612 static int snd_at73c213_line_capture_volume_info( 613 struct snd_kcontrol *kcontrol, 614 struct snd_ctl_elem_info *uinfo) 615 { 616 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 617 uinfo->count = 2; 618 /* When inverted will give values 0x10001 => 0. */ 619 uinfo->value.integer.min = 14; 620 uinfo->value.integer.max = 31; 621 622 return 0; 623 } 624 625 static int snd_at73c213_aux_capture_volume_info( 626 struct snd_kcontrol *kcontrol, 627 struct snd_ctl_elem_info *uinfo) 628 { 629 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 630 uinfo->count = 1; 631 /* When inverted will give values 0x10001 => 0. */ 632 uinfo->value.integer.min = 14; 633 uinfo->value.integer.max = 31; 634 635 return 0; 636 } 637 638 #define AT73C213_MONO_SWITCH(xname, xindex, reg, shift, mask, invert) \ 639 { \ 640 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \ 641 .name = xname, \ 642 .index = xindex, \ 643 .info = snd_at73c213_mono_switch_info, \ 644 .get = snd_at73c213_mono_switch_get, \ 645 .put = snd_at73c213_mono_switch_put, \ 646 .private_value = (reg | (shift << 8) | (mask << 16) | (invert << 24)) \ 647 } 648 649 #define AT73C213_STEREO(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \ 650 { \ 651 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \ 652 .name = xname, \ 653 .index = xindex, \ 654 .info = snd_at73c213_stereo_info, \ 655 .get = snd_at73c213_stereo_get, \ 656 .put = snd_at73c213_stereo_put, \ 657 .private_value = (left_reg | (right_reg << 8) \ 658 | (shift_left << 16) | (shift_right << 19) \ 659 | (mask << 24) | (invert << 22)) \ 660 } 661 662 static const struct snd_kcontrol_new snd_at73c213_controls[] = { 663 AT73C213_STEREO("Master Playback Volume", 0, DAC_LMPG, DAC_RMPG, 0, 0, 0x1f, 1), 664 AT73C213_STEREO("Master Playback Switch", 0, DAC_LMPG, DAC_RMPG, 5, 5, 1, 1), 665 AT73C213_STEREO("PCM Playback Volume", 0, DAC_LLOG, DAC_RLOG, 0, 0, 0x1f, 1), 666 AT73C213_STEREO("PCM Playback Switch", 0, DAC_LLOG, DAC_RLOG, 5, 5, 1, 1), 667 AT73C213_MONO_SWITCH("Mono PA Playback Switch", 0, DAC_CTRL, DAC_CTRL_ONPADRV, 668 0x01, 0), 669 { 670 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 671 .name = "PA Playback Volume", 672 .index = 0, 673 .info = snd_at73c213_pa_volume_info, 674 .get = snd_at73c213_mono_get, 675 .put = snd_at73c213_mono_put, 676 .private_value = PA_CTRL | (PA_CTRL_APAGAIN << 8) | \ 677 (0x0f << 16) | (1 << 24), 678 }, 679 AT73C213_MONO_SWITCH("PA High Gain Playback Switch", 0, PA_CTRL, PA_CTRL_APALP, 680 0x01, 1), 681 AT73C213_MONO_SWITCH("PA Playback Switch", 0, PA_CTRL, PA_CTRL_APAON, 0x01, 0), 682 { 683 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 684 .name = "Aux Capture Volume", 685 .index = 0, 686 .info = snd_at73c213_aux_capture_volume_info, 687 .get = snd_at73c213_mono_get, 688 .put = snd_at73c213_mono_put, 689 .private_value = DAC_AUXG | (0 << 8) | (0x1f << 16) | (1 << 24), 690 }, 691 AT73C213_MONO_SWITCH("Aux Capture Switch", 0, DAC_CTRL, DAC_CTRL_ONAUXIN, 692 0x01, 0), 693 { 694 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 695 .name = "Line Capture Volume", 696 .index = 0, 697 .info = snd_at73c213_line_capture_volume_info, 698 .get = snd_at73c213_stereo_get, 699 .put = snd_at73c213_stereo_put, 700 .private_value = DAC_LLIG | (DAC_RLIG << 8) | (0 << 16) | (0 << 19) 701 | (0x1f << 24) | (1 << 22), 702 }, 703 AT73C213_MONO_SWITCH("Line Capture Switch", 0, DAC_CTRL, 0, 0x03, 0), 704 }; 705 706 static int snd_at73c213_mixer(struct snd_at73c213 *chip) 707 { 708 struct snd_card *card; 709 int errval, idx; 710 711 if (chip == NULL || chip->pcm == NULL) 712 return -EINVAL; 713 714 card = chip->card; 715 716 strcpy(card->mixername, chip->pcm->name); 717 718 for (idx = 0; idx < ARRAY_SIZE(snd_at73c213_controls); idx++) { 719 errval = snd_ctl_add(card, 720 snd_ctl_new1(&snd_at73c213_controls[idx], 721 chip)); 722 if (errval < 0) 723 goto cleanup; 724 } 725 726 return 0; 727 728 cleanup: 729 for (idx = 1; idx < ARRAY_SIZE(snd_at73c213_controls) + 1; idx++) 730 snd_ctl_remove(card, snd_ctl_find_numid(card, idx)); 731 return errval; 732 } 733 734 /* 735 * Device functions 736 */ 737 static int snd_at73c213_ssc_init(struct snd_at73c213 *chip) 738 { 739 /* 740 * Continuous clock output. 741 * Starts on falling TF. 742 * Delay 1 cycle (1 bit). 743 * Periode is 16 bit (16 - 1). 744 */ 745 ssc_writel(chip->ssc->regs, TCMR, 746 SSC_BF(TCMR_CKO, 1) 747 | SSC_BF(TCMR_START, 4) 748 | SSC_BF(TCMR_STTDLY, 1) 749 | SSC_BF(TCMR_PERIOD, 16 - 1)); 750 /* 751 * Data length is 16 bit (16 - 1). 752 * Transmit MSB first. 753 * Transmit 2 words each transfer. 754 * Frame sync length is 16 bit (16 - 1). 755 * Frame starts on negative pulse. 756 */ 757 ssc_writel(chip->ssc->regs, TFMR, 758 SSC_BF(TFMR_DATLEN, 16 - 1) 759 | SSC_BIT(TFMR_MSBF) 760 | SSC_BF(TFMR_DATNB, 1) 761 | SSC_BF(TFMR_FSLEN, 16 - 1) 762 | SSC_BF(TFMR_FSOS, 1)); 763 764 return 0; 765 } 766 767 static int snd_at73c213_chip_init(struct snd_at73c213 *chip) 768 { 769 int retval; 770 unsigned char dac_ctrl = 0; 771 772 retval = snd_at73c213_set_bitrate(chip); 773 if (retval) 774 goto out; 775 776 /* Enable DAC master clock. */ 777 retval = clk_enable(chip->board->dac_clk); 778 if (retval) 779 goto out; 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 retval = clk_enable(chip->ssc->clk); 893 if (retval) 894 return retval; 895 896 retval = request_irq(irq, snd_at73c213_interrupt, 0, "at73c213", chip); 897 if (retval) { 898 dev_dbg(&chip->spi->dev, "unable to request irq %d\n", irq); 899 goto out; 900 } 901 chip->irq = irq; 902 903 memcpy(&chip->reg_image, &snd_at73c213_original_image, 904 sizeof(snd_at73c213_original_image)); 905 906 retval = snd_at73c213_ssc_init(chip); 907 if (retval) 908 goto out_irq; 909 910 retval = snd_at73c213_chip_init(chip); 911 if (retval) 912 goto out_irq; 913 914 retval = snd_at73c213_pcm_new(chip, 0); 915 if (retval) 916 goto out_irq; 917 918 retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops); 919 if (retval) 920 goto out_irq; 921 922 retval = snd_at73c213_mixer(chip); 923 if (retval) 924 goto out_snd_dev; 925 926 goto out; 927 928 out_snd_dev: 929 snd_device_free(card, chip); 930 out_irq: 931 free_irq(chip->irq, chip); 932 chip->irq = -1; 933 out: 934 clk_disable(chip->ssc->clk); 935 936 return retval; 937 } 938 939 static int snd_at73c213_probe(struct spi_device *spi) 940 { 941 struct snd_card *card; 942 struct snd_at73c213 *chip; 943 struct at73c213_board_info *board; 944 int retval; 945 char id[16]; 946 947 board = spi->dev.platform_data; 948 if (!board) { 949 dev_dbg(&spi->dev, "no platform_data\n"); 950 return -ENXIO; 951 } 952 953 if (!board->dac_clk) { 954 dev_dbg(&spi->dev, "no DAC clk\n"); 955 return -ENXIO; 956 } 957 958 if (IS_ERR(board->dac_clk)) { 959 dev_dbg(&spi->dev, "no DAC clk\n"); 960 return PTR_ERR(board->dac_clk); 961 } 962 963 /* Allocate "card" using some unused identifiers. */ 964 snprintf(id, sizeof id, "at73c213_%d", board->ssc_id); 965 retval = snd_card_new(&spi->dev, -1, id, THIS_MODULE, 966 sizeof(struct snd_at73c213), &card); 967 if (retval < 0) 968 goto out; 969 970 chip = card->private_data; 971 chip->spi = spi; 972 chip->board = board; 973 974 chip->ssc = ssc_request(board->ssc_id); 975 if (IS_ERR(chip->ssc)) { 976 dev_dbg(&spi->dev, "could not get ssc%d device\n", 977 board->ssc_id); 978 retval = PTR_ERR(chip->ssc); 979 goto out_card; 980 } 981 982 retval = snd_at73c213_dev_init(card, spi); 983 if (retval) 984 goto out_ssc; 985 986 strcpy(card->driver, "at73c213"); 987 strcpy(card->shortname, board->shortname); 988 sprintf(card->longname, "%s on irq %d", card->shortname, chip->irq); 989 990 retval = snd_card_register(card); 991 if (retval) 992 goto out_ssc; 993 994 dev_set_drvdata(&spi->dev, card); 995 996 goto out; 997 998 out_ssc: 999 ssc_free(chip->ssc); 1000 out_card: 1001 snd_card_free(card); 1002 out: 1003 return retval; 1004 } 1005 1006 static void snd_at73c213_remove(struct spi_device *spi) 1007 { 1008 struct snd_card *card = dev_get_drvdata(&spi->dev); 1009 struct snd_at73c213 *chip = card->private_data; 1010 int retval; 1011 1012 /* Stop playback. */ 1013 retval = clk_enable(chip->ssc->clk); 1014 if (retval) 1015 goto out; 1016 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS)); 1017 clk_disable(chip->ssc->clk); 1018 1019 /* Mute sound. */ 1020 retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f); 1021 if (retval) 1022 goto out; 1023 retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f); 1024 if (retval) 1025 goto out; 1026 retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f); 1027 if (retval) 1028 goto out; 1029 retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f); 1030 if (retval) 1031 goto out; 1032 retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11); 1033 if (retval) 1034 goto out; 1035 retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11); 1036 if (retval) 1037 goto out; 1038 retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11); 1039 if (retval) 1040 goto out; 1041 1042 /* Turn off PA. */ 1043 retval = snd_at73c213_write_reg(chip, PA_CTRL, 1044 chip->reg_image[PA_CTRL] | 0x0f); 1045 if (retval) 1046 goto out; 1047 msleep(10); 1048 retval = snd_at73c213_write_reg(chip, PA_CTRL, 1049 (1 << PA_CTRL_APALP) | 0x0f); 1050 if (retval) 1051 goto out; 1052 1053 /* Turn off external DAC. */ 1054 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x0c); 1055 if (retval) 1056 goto out; 1057 msleep(2); 1058 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x00); 1059 if (retval) 1060 goto out; 1061 1062 /* Turn off master power. */ 1063 retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0x00); 1064 if (retval) 1065 goto out; 1066 1067 out: 1068 /* Stop DAC master clock. */ 1069 clk_disable(chip->board->dac_clk); 1070 1071 ssc_free(chip->ssc); 1072 snd_card_free(card); 1073 } 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 int retval; 1092 1093 retval = clk_enable(chip->board->dac_clk); 1094 if (retval) 1095 return retval; 1096 retval = clk_enable(chip->ssc->clk); 1097 if (retval) { 1098 clk_disable(chip->board->dac_clk); 1099 return retval; 1100 } 1101 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN)); 1102 1103 return 0; 1104 } 1105 1106 static DEFINE_SIMPLE_DEV_PM_OPS(at73c213_pm_ops, snd_at73c213_suspend, 1107 snd_at73c213_resume); 1108 1109 static struct spi_driver at73c213_driver = { 1110 .driver = { 1111 .name = "at73c213", 1112 .pm = &at73c213_pm_ops, 1113 }, 1114 .probe = snd_at73c213_probe, 1115 .remove = snd_at73c213_remove, 1116 }; 1117 1118 module_spi_driver(at73c213_driver); 1119 1120 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); 1121 MODULE_DESCRIPTION("Sound driver for AT73C213 with Atmel SSC"); 1122 MODULE_LICENSE("GPL"); 1123