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 snd_at73c213_write_reg(struct snd_at73c213 * chip,u8 reg,u8 val)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 */ snd_at73c213_set_bitrate(struct snd_at73c213 * chip)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 snd_at73c213_pcm_open(struct snd_pcm_substream * substream)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 snd_at73c213_pcm_close(struct snd_pcm_substream * substream)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 snd_at73c213_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)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 snd_at73c213_pcm_prepare(struct snd_pcm_substream * substream)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 snd_at73c213_pcm_trigger(struct snd_pcm_substream * substream,int cmd)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 snd_at73c213_pcm_pointer(struct snd_pcm_substream * substream)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 snd_at73c213_pcm_new(struct snd_at73c213 * chip,int device)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 snd_at73c213_interrupt(int irq,void * dev_id)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 */ snd_at73c213_mono_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)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 snd_at73c213_mono_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)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 snd_at73c213_stereo_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)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 snd_at73c213_stereo_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)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 snd_at73c213_stereo_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)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 snd_at73c213_mono_switch_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)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 snd_at73c213_mono_switch_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)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 snd_at73c213_pa_volume_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)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 snd_at73c213_line_capture_volume_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)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 snd_at73c213_aux_capture_volume_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)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 snd_at73c213_mixer(struct snd_at73c213 * chip)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 struct snd_kcontrol *kctl; 731 kctl = snd_ctl_find_numid(card, idx); 732 if (kctl) 733 snd_ctl_remove(card, kctl); 734 } 735 return errval; 736 } 737 738 /* 739 * Device functions 740 */ snd_at73c213_ssc_init(struct snd_at73c213 * chip)741 static int snd_at73c213_ssc_init(struct snd_at73c213 *chip) 742 { 743 /* 744 * Continuous clock output. 745 * Starts on falling TF. 746 * Delay 1 cycle (1 bit). 747 * Periode is 16 bit (16 - 1). 748 */ 749 ssc_writel(chip->ssc->regs, TCMR, 750 SSC_BF(TCMR_CKO, 1) 751 | SSC_BF(TCMR_START, 4) 752 | SSC_BF(TCMR_STTDLY, 1) 753 | SSC_BF(TCMR_PERIOD, 16 - 1)); 754 /* 755 * Data length is 16 bit (16 - 1). 756 * Transmit MSB first. 757 * Transmit 2 words each transfer. 758 * Frame sync length is 16 bit (16 - 1). 759 * Frame starts on negative pulse. 760 */ 761 ssc_writel(chip->ssc->regs, TFMR, 762 SSC_BF(TFMR_DATLEN, 16 - 1) 763 | SSC_BIT(TFMR_MSBF) 764 | SSC_BF(TFMR_DATNB, 1) 765 | SSC_BF(TFMR_FSLEN, 16 - 1) 766 | SSC_BF(TFMR_FSOS, 1)); 767 768 return 0; 769 } 770 snd_at73c213_chip_init(struct snd_at73c213 * chip)771 static int snd_at73c213_chip_init(struct snd_at73c213 *chip) 772 { 773 int retval; 774 unsigned char dac_ctrl = 0; 775 776 retval = snd_at73c213_set_bitrate(chip); 777 if (retval) 778 goto out; 779 780 /* Enable DAC master clock. */ 781 retval = clk_enable(chip->board->dac_clk); 782 if (retval) 783 goto out; 784 785 /* Initialize at73c213 on SPI bus. */ 786 retval = snd_at73c213_write_reg(chip, DAC_RST, 0x04); 787 if (retval) 788 goto out_clk; 789 msleep(1); 790 retval = snd_at73c213_write_reg(chip, DAC_RST, 0x03); 791 if (retval) 792 goto out_clk; 793 794 /* Precharge everything. */ 795 retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0xff); 796 if (retval) 797 goto out_clk; 798 retval = snd_at73c213_write_reg(chip, PA_CTRL, (1<<PA_CTRL_APAPRECH)); 799 if (retval) 800 goto out_clk; 801 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 802 (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR)); 803 if (retval) 804 goto out_clk; 805 806 msleep(50); 807 808 /* Stop precharging PA. */ 809 retval = snd_at73c213_write_reg(chip, PA_CTRL, 810 (1<<PA_CTRL_APALP) | 0x0f); 811 if (retval) 812 goto out_clk; 813 814 msleep(450); 815 816 /* Stop precharging DAC, turn on master power. */ 817 retval = snd_at73c213_write_reg(chip, DAC_PRECH, (1<<DAC_PRECH_ONMSTR)); 818 if (retval) 819 goto out_clk; 820 821 msleep(1); 822 823 /* Turn on DAC. */ 824 dac_ctrl = (1<<DAC_CTRL_ONDACL) | (1<<DAC_CTRL_ONDACR) 825 | (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR); 826 827 retval = snd_at73c213_write_reg(chip, DAC_CTRL, dac_ctrl); 828 if (retval) 829 goto out_clk; 830 831 /* Mute sound. */ 832 retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f); 833 if (retval) 834 goto out_clk; 835 retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f); 836 if (retval) 837 goto out_clk; 838 retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f); 839 if (retval) 840 goto out_clk; 841 retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f); 842 if (retval) 843 goto out_clk; 844 retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11); 845 if (retval) 846 goto out_clk; 847 retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11); 848 if (retval) 849 goto out_clk; 850 retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11); 851 if (retval) 852 goto out_clk; 853 854 /* Enable I2S device, i.e. clock output. */ 855 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN)); 856 857 goto out; 858 859 out_clk: 860 clk_disable(chip->board->dac_clk); 861 out: 862 return retval; 863 } 864 snd_at73c213_dev_free(struct snd_device * device)865 static int snd_at73c213_dev_free(struct snd_device *device) 866 { 867 struct snd_at73c213 *chip = device->device_data; 868 869 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS)); 870 if (chip->irq >= 0) { 871 free_irq(chip->irq, chip); 872 chip->irq = -1; 873 } 874 875 return 0; 876 } 877 snd_at73c213_dev_init(struct snd_card * card,struct spi_device * spi)878 static int snd_at73c213_dev_init(struct snd_card *card, 879 struct spi_device *spi) 880 { 881 static const struct snd_device_ops ops = { 882 .dev_free = snd_at73c213_dev_free, 883 }; 884 struct snd_at73c213 *chip = get_chip(card); 885 int irq, retval; 886 887 irq = chip->ssc->irq; 888 if (irq < 0) 889 return irq; 890 891 spin_lock_init(&chip->lock); 892 mutex_init(&chip->mixer_lock); 893 chip->card = card; 894 chip->irq = -1; 895 896 retval = clk_enable(chip->ssc->clk); 897 if (retval) 898 return retval; 899 900 retval = request_irq(irq, snd_at73c213_interrupt, 0, "at73c213", chip); 901 if (retval) { 902 dev_dbg(&chip->spi->dev, "unable to request irq %d\n", irq); 903 goto out; 904 } 905 chip->irq = irq; 906 907 memcpy(&chip->reg_image, &snd_at73c213_original_image, 908 sizeof(snd_at73c213_original_image)); 909 910 retval = snd_at73c213_ssc_init(chip); 911 if (retval) 912 goto out_irq; 913 914 retval = snd_at73c213_chip_init(chip); 915 if (retval) 916 goto out_irq; 917 918 retval = snd_at73c213_pcm_new(chip, 0); 919 if (retval) 920 goto out_irq; 921 922 retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops); 923 if (retval) 924 goto out_irq; 925 926 retval = snd_at73c213_mixer(chip); 927 if (retval) 928 goto out_snd_dev; 929 930 goto out; 931 932 out_snd_dev: 933 snd_device_free(card, chip); 934 out_irq: 935 free_irq(chip->irq, chip); 936 chip->irq = -1; 937 out: 938 clk_disable(chip->ssc->clk); 939 940 return retval; 941 } 942 snd_at73c213_probe(struct spi_device * spi)943 static int snd_at73c213_probe(struct spi_device *spi) 944 { 945 struct snd_card *card; 946 struct snd_at73c213 *chip; 947 struct at73c213_board_info *board; 948 int retval; 949 char id[16]; 950 951 board = spi->dev.platform_data; 952 if (!board) { 953 dev_dbg(&spi->dev, "no platform_data\n"); 954 return -ENXIO; 955 } 956 957 if (!board->dac_clk) { 958 dev_dbg(&spi->dev, "no DAC clk\n"); 959 return -ENXIO; 960 } 961 962 if (IS_ERR(board->dac_clk)) { 963 dev_dbg(&spi->dev, "no DAC clk\n"); 964 return PTR_ERR(board->dac_clk); 965 } 966 967 /* Allocate "card" using some unused identifiers. */ 968 snprintf(id, sizeof id, "at73c213_%d", board->ssc_id); 969 retval = snd_card_new(&spi->dev, -1, id, THIS_MODULE, 970 sizeof(struct snd_at73c213), &card); 971 if (retval < 0) 972 goto out; 973 974 chip = card->private_data; 975 chip->spi = spi; 976 chip->board = board; 977 978 chip->ssc = ssc_request(board->ssc_id); 979 if (IS_ERR(chip->ssc)) { 980 dev_dbg(&spi->dev, "could not get ssc%d device\n", 981 board->ssc_id); 982 retval = PTR_ERR(chip->ssc); 983 goto out_card; 984 } 985 986 retval = snd_at73c213_dev_init(card, spi); 987 if (retval) 988 goto out_ssc; 989 990 strcpy(card->driver, "at73c213"); 991 strcpy(card->shortname, board->shortname); 992 sprintf(card->longname, "%s on irq %d", card->shortname, chip->irq); 993 994 retval = snd_card_register(card); 995 if (retval) 996 goto out_ssc; 997 998 dev_set_drvdata(&spi->dev, card); 999 1000 goto out; 1001 1002 out_ssc: 1003 ssc_free(chip->ssc); 1004 out_card: 1005 snd_card_free(card); 1006 out: 1007 return retval; 1008 } 1009 snd_at73c213_remove(struct spi_device * spi)1010 static void snd_at73c213_remove(struct spi_device *spi) 1011 { 1012 struct snd_card *card = dev_get_drvdata(&spi->dev); 1013 struct snd_at73c213 *chip = card->private_data; 1014 int retval; 1015 1016 /* Stop playback. */ 1017 retval = clk_enable(chip->ssc->clk); 1018 if (retval) 1019 goto out; 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 1079 #ifdef CONFIG_PM_SLEEP 1080 snd_at73c213_suspend(struct device * dev)1081 static int snd_at73c213_suspend(struct device *dev) 1082 { 1083 struct snd_card *card = dev_get_drvdata(dev); 1084 struct snd_at73c213 *chip = card->private_data; 1085 1086 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS)); 1087 clk_disable(chip->ssc->clk); 1088 clk_disable(chip->board->dac_clk); 1089 1090 return 0; 1091 } 1092 snd_at73c213_resume(struct device * dev)1093 static int snd_at73c213_resume(struct device *dev) 1094 { 1095 struct snd_card *card = dev_get_drvdata(dev); 1096 struct snd_at73c213 *chip = card->private_data; 1097 int retval; 1098 1099 retval = clk_enable(chip->board->dac_clk); 1100 if (retval) 1101 return retval; 1102 retval = clk_enable(chip->ssc->clk); 1103 if (retval) { 1104 clk_disable(chip->board->dac_clk); 1105 return retval; 1106 } 1107 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN)); 1108 1109 return 0; 1110 } 1111 1112 static SIMPLE_DEV_PM_OPS(at73c213_pm_ops, snd_at73c213_suspend, 1113 snd_at73c213_resume); 1114 #define AT73C213_PM_OPS (&at73c213_pm_ops) 1115 1116 #else 1117 #define AT73C213_PM_OPS NULL 1118 #endif 1119 1120 static struct spi_driver at73c213_driver = { 1121 .driver = { 1122 .name = "at73c213", 1123 .pm = AT73C213_PM_OPS, 1124 }, 1125 .probe = snd_at73c213_probe, 1126 .remove = snd_at73c213_remove, 1127 }; 1128 1129 module_spi_driver(at73c213_driver); 1130 1131 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); 1132 MODULE_DESCRIPTION("Sound driver for AT73C213 with Atmel SSC"); 1133 MODULE_LICENSE("GPL"); 1134