2 * Driver for AT73C213 16-bit stereo DAC connected to Atmel SSC
4 * Copyright (C) 2006-2007 Atmel Norway
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
13 #include <linux/clk.h>
14 #include <linux/err.h>
15 #include <linux/delay.h>
16 #include <linux/device.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/module.h>
21 #include <linux/mutex.h>
22 #include <linux/platform_device.h>
25 #include <sound/initval.h>
26 #include <sound/control.h>
27 #include <sound/core.h>
28 #include <sound/pcm.h>
30 #include <linux/atmel-ssc.h>
32 #include <linux/spi/spi.h>
33 #include <linux/spi/at73c213.h>
37 #define BITRATE_MIN 8000 /* Hardware limit? */
38 #define BITRATE_TARGET CONFIG_SND_AT73C213_TARGET_BITRATE
39 #define BITRATE_MAX 50000 /* Hardware limit. */
41 /* Initial (hardware reset) AT73C213 register values. */
42 static u8 snd_at73c213_original_image[18] =
56 0x00, /* 0C - PRECH */
61 0x00, /* 11 - PA_CTRL */
65 struct snd_card *card;
67 struct snd_pcm_substream *substream;
68 struct at73c213_board_info *board;
71 unsigned long bitrate;
72 struct ssc_device *ssc;
73 struct spi_device *spi;
76 /* Image of the SPI registers in AT73C213. */
78 /* Protect SSC registers against concurrent access. */
80 /* Protect mixer registers against concurrent access. */
81 struct mutex mixer_lock;
84 #define get_chip(card) ((struct snd_at73c213 *)card->private_data)
87 snd_at73c213_write_reg(struct snd_at73c213 *chip, u8 reg, u8 val)
89 struct spi_message msg;
90 struct spi_transfer msg_xfer = {
96 spi_message_init(&msg);
98 chip->spi_wbuffer[0] = reg;
99 chip->spi_wbuffer[1] = val;
101 msg_xfer.tx_buf = chip->spi_wbuffer;
102 msg_xfer.rx_buf = chip->spi_rbuffer;
103 spi_message_add_tail(&msg_xfer, &msg);
105 retval = spi_sync(chip->spi, &msg);
108 chip->reg_image[reg] = val;
113 static struct snd_pcm_hardware snd_at73c213_playback_hw = {
114 .info = SNDRV_PCM_INFO_INTERLEAVED |
115 SNDRV_PCM_INFO_BLOCK_TRANSFER,
116 .formats = SNDRV_PCM_FMTBIT_S16_BE,
117 .rates = SNDRV_PCM_RATE_CONTINUOUS,
118 .rate_min = 8000, /* Replaced by chip->bitrate later. */
119 .rate_max = 50000, /* Replaced by chip->bitrate later. */
122 .buffer_bytes_max = 64 * 1024 - 1,
123 .period_bytes_min = 512,
124 .period_bytes_max = 64 * 1024 - 1,
130 * Calculate and set bitrate and divisions.
132 static int snd_at73c213_set_bitrate(struct snd_at73c213 *chip)
134 unsigned long ssc_rate = clk_get_rate(chip->ssc->clk);
135 unsigned long dac_rate_new, ssc_div;
137 unsigned long ssc_div_max, ssc_div_min;
141 * We connect two clocks here, picking divisors so the I2S clocks
142 * out data at the same rate the DAC clocks it in ... and as close
143 * as practical to the desired target rate.
145 * The DAC master clock (MCLK) is programmable, and is either 256
146 * or (not here) 384 times the I2S output clock (BCLK).
149 /* SSC clock / (bitrate * stereo * 16-bit). */
150 ssc_div = ssc_rate / (BITRATE_TARGET * 2 * 16);
151 ssc_div_min = ssc_rate / (BITRATE_MAX * 2 * 16);
152 ssc_div_max = ssc_rate / (BITRATE_MIN * 2 * 16);
153 max_tries = (ssc_div_max - ssc_div_min) / 2;
158 /* ssc_div must be even. */
159 ssc_div = (ssc_div + 1) & ~1UL;
161 if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN) {
163 if ((ssc_rate / (ssc_div * 2 * 16)) > BITRATE_MAX)
167 /* Search for a possible bitrate. */
169 /* SSC clock / (ssc divider * 16-bit * stereo). */
170 if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN)
173 /* 256 / (2 * 16) = 8 */
174 dac_rate_new = 8 * (ssc_rate / ssc_div);
176 status = clk_round_rate(chip->board->dac_clk, dac_rate_new);
180 /* Ignore difference smaller than 256 Hz. */
181 if ((status/256) == (dac_rate_new/256))
185 } while (--max_tries);
187 /* Not able to find a valid bitrate. */
191 status = clk_set_rate(chip->board->dac_clk, status);
195 /* Set divider in SSC device. */
196 ssc_writel(chip->ssc->regs, CMR, ssc_div/2);
198 /* SSC clock / (ssc divider * 16-bit * stereo). */
199 chip->bitrate = ssc_rate / (ssc_div * 16 * 2);
201 dev_info(&chip->spi->dev,
202 "at73c213: supported bitrate is %lu (%lu divider)\n",
203 chip->bitrate, ssc_div);
208 static int snd_at73c213_pcm_open(struct snd_pcm_substream *substream)
210 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
211 struct snd_pcm_runtime *runtime = substream->runtime;
214 /* ensure buffer_size is a multiple of period_size */
215 err = snd_pcm_hw_constraint_integer(runtime,
216 SNDRV_PCM_HW_PARAM_PERIODS);
219 snd_at73c213_playback_hw.rate_min = chip->bitrate;
220 snd_at73c213_playback_hw.rate_max = chip->bitrate;
221 runtime->hw = snd_at73c213_playback_hw;
222 chip->substream = substream;
224 err = clk_enable(chip->ssc->clk);
231 static int snd_at73c213_pcm_close(struct snd_pcm_substream *substream)
233 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
234 chip->substream = NULL;
235 clk_disable(chip->ssc->clk);
239 static int snd_at73c213_pcm_hw_params(struct snd_pcm_substream *substream,
240 struct snd_pcm_hw_params *hw_params)
242 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
243 int channels = params_channels(hw_params);
246 val = ssc_readl(chip->ssc->regs, TFMR);
247 val = SSC_BFINS(TFMR_DATNB, channels - 1, val);
248 ssc_writel(chip->ssc->regs, TFMR, val);
250 return snd_pcm_lib_malloc_pages(substream,
251 params_buffer_bytes(hw_params));
254 static int snd_at73c213_pcm_hw_free(struct snd_pcm_substream *substream)
256 return snd_pcm_lib_free_pages(substream);
259 static int snd_at73c213_pcm_prepare(struct snd_pcm_substream *substream)
261 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
262 struct snd_pcm_runtime *runtime = substream->runtime;
265 block_size = frames_to_bytes(runtime, runtime->period_size);
269 ssc_writel(chip->ssc->regs, PDC_TPR,
270 (long)runtime->dma_addr);
271 ssc_writel(chip->ssc->regs, PDC_TCR,
272 runtime->period_size * runtime->channels);
273 ssc_writel(chip->ssc->regs, PDC_TNPR,
274 (long)runtime->dma_addr + block_size);
275 ssc_writel(chip->ssc->regs, PDC_TNCR,
276 runtime->period_size * runtime->channels);
281 static int snd_at73c213_pcm_trigger(struct snd_pcm_substream *substream,
284 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
287 spin_lock(&chip->lock);
290 case SNDRV_PCM_TRIGGER_START:
291 ssc_writel(chip->ssc->regs, IER, SSC_BIT(IER_ENDTX));
292 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTEN));
294 case SNDRV_PCM_TRIGGER_STOP:
295 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTDIS));
296 ssc_writel(chip->ssc->regs, IDR, SSC_BIT(IDR_ENDTX));
299 dev_dbg(&chip->spi->dev, "spurious command %x\n", cmd);
304 spin_unlock(&chip->lock);
309 static snd_pcm_uframes_t
310 snd_at73c213_pcm_pointer(struct snd_pcm_substream *substream)
312 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
313 struct snd_pcm_runtime *runtime = substream->runtime;
314 snd_pcm_uframes_t pos;
317 bytes = ssc_readl(chip->ssc->regs, PDC_TPR)
318 - (unsigned long)runtime->dma_addr;
320 pos = bytes_to_frames(runtime, bytes);
321 if (pos >= runtime->buffer_size)
322 pos -= runtime->buffer_size;
327 static const struct snd_pcm_ops at73c213_playback_ops = {
328 .open = snd_at73c213_pcm_open,
329 .close = snd_at73c213_pcm_close,
330 .ioctl = snd_pcm_lib_ioctl,
331 .hw_params = snd_at73c213_pcm_hw_params,
332 .hw_free = snd_at73c213_pcm_hw_free,
333 .prepare = snd_at73c213_pcm_prepare,
334 .trigger = snd_at73c213_pcm_trigger,
335 .pointer = snd_at73c213_pcm_pointer,
338 static int snd_at73c213_pcm_new(struct snd_at73c213 *chip, int device)
343 retval = snd_pcm_new(chip->card, chip->card->shortname,
348 pcm->private_data = chip;
349 pcm->info_flags = SNDRV_PCM_INFO_BLOCK_TRANSFER;
350 strcpy(pcm->name, "at73c213");
353 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &at73c213_playback_ops);
355 retval = snd_pcm_lib_preallocate_pages_for_all(chip->pcm,
356 SNDRV_DMA_TYPE_DEV, &chip->ssc->pdev->dev,
357 64 * 1024, 64 * 1024);
362 static irqreturn_t snd_at73c213_interrupt(int irq, void *dev_id)
364 struct snd_at73c213 *chip = dev_id;
365 struct snd_pcm_runtime *runtime = chip->substream->runtime;
370 int retval = IRQ_NONE;
372 spin_lock(&chip->lock);
374 block_size = frames_to_bytes(runtime, runtime->period_size);
375 status = ssc_readl(chip->ssc->regs, IMR);
377 if (status & SSC_BIT(IMR_ENDTX)) {
379 if (chip->period == runtime->periods)
381 next_period = chip->period + 1;
382 if (next_period == runtime->periods)
385 offset = block_size * next_period;
387 ssc_writel(chip->ssc->regs, PDC_TNPR,
388 (long)runtime->dma_addr + offset);
389 ssc_writel(chip->ssc->regs, PDC_TNCR,
390 runtime->period_size * runtime->channels);
391 retval = IRQ_HANDLED;
394 ssc_readl(chip->ssc->regs, IMR);
395 spin_unlock(&chip->lock);
397 if (status & SSC_BIT(IMR_ENDTX))
398 snd_pcm_period_elapsed(chip->substream);
406 static int snd_at73c213_mono_get(struct snd_kcontrol *kcontrol,
407 struct snd_ctl_elem_value *ucontrol)
409 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
410 int reg = kcontrol->private_value & 0xff;
411 int shift = (kcontrol->private_value >> 8) & 0xff;
412 int mask = (kcontrol->private_value >> 16) & 0xff;
413 int invert = (kcontrol->private_value >> 24) & 0xff;
415 mutex_lock(&chip->mixer_lock);
417 ucontrol->value.integer.value[0] =
418 (chip->reg_image[reg] >> shift) & mask;
421 ucontrol->value.integer.value[0] =
422 mask - ucontrol->value.integer.value[0];
424 mutex_unlock(&chip->mixer_lock);
429 static int snd_at73c213_mono_put(struct snd_kcontrol *kcontrol,
430 struct snd_ctl_elem_value *ucontrol)
432 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
433 int reg = kcontrol->private_value & 0xff;
434 int shift = (kcontrol->private_value >> 8) & 0xff;
435 int mask = (kcontrol->private_value >> 16) & 0xff;
436 int invert = (kcontrol->private_value >> 24) & 0xff;
440 val = (ucontrol->value.integer.value[0] & mask);
445 mutex_lock(&chip->mixer_lock);
447 val = (chip->reg_image[reg] & ~(mask << shift)) | val;
448 change = val != chip->reg_image[reg];
449 retval = snd_at73c213_write_reg(chip, reg, val);
451 mutex_unlock(&chip->mixer_lock);
459 static int snd_at73c213_stereo_info(struct snd_kcontrol *kcontrol,
460 struct snd_ctl_elem_info *uinfo)
462 int mask = (kcontrol->private_value >> 24) & 0xff;
465 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
467 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
470 uinfo->value.integer.min = 0;
471 uinfo->value.integer.max = mask;
476 static int snd_at73c213_stereo_get(struct snd_kcontrol *kcontrol,
477 struct snd_ctl_elem_value *ucontrol)
479 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
480 int left_reg = kcontrol->private_value & 0xff;
481 int right_reg = (kcontrol->private_value >> 8) & 0xff;
482 int shift_left = (kcontrol->private_value >> 16) & 0x07;
483 int shift_right = (kcontrol->private_value >> 19) & 0x07;
484 int mask = (kcontrol->private_value >> 24) & 0xff;
485 int invert = (kcontrol->private_value >> 22) & 1;
487 mutex_lock(&chip->mixer_lock);
489 ucontrol->value.integer.value[0] =
490 (chip->reg_image[left_reg] >> shift_left) & mask;
491 ucontrol->value.integer.value[1] =
492 (chip->reg_image[right_reg] >> shift_right) & mask;
495 ucontrol->value.integer.value[0] =
496 mask - ucontrol->value.integer.value[0];
497 ucontrol->value.integer.value[1] =
498 mask - ucontrol->value.integer.value[1];
501 mutex_unlock(&chip->mixer_lock);
506 static int snd_at73c213_stereo_put(struct snd_kcontrol *kcontrol,
507 struct snd_ctl_elem_value *ucontrol)
509 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
510 int left_reg = kcontrol->private_value & 0xff;
511 int right_reg = (kcontrol->private_value >> 8) & 0xff;
512 int shift_left = (kcontrol->private_value >> 16) & 0x07;
513 int shift_right = (kcontrol->private_value >> 19) & 0x07;
514 int mask = (kcontrol->private_value >> 24) & 0xff;
515 int invert = (kcontrol->private_value >> 22) & 1;
517 unsigned short val1, val2;
519 val1 = ucontrol->value.integer.value[0] & mask;
520 val2 = ucontrol->value.integer.value[1] & mask;
526 val2 <<= shift_right;
528 mutex_lock(&chip->mixer_lock);
530 val1 = (chip->reg_image[left_reg] & ~(mask << shift_left)) | val1;
531 val2 = (chip->reg_image[right_reg] & ~(mask << shift_right)) | val2;
532 change = val1 != chip->reg_image[left_reg]
533 || val2 != chip->reg_image[right_reg];
534 retval = snd_at73c213_write_reg(chip, left_reg, val1);
536 mutex_unlock(&chip->mixer_lock);
539 retval = snd_at73c213_write_reg(chip, right_reg, val2);
541 mutex_unlock(&chip->mixer_lock);
545 mutex_unlock(&chip->mixer_lock);
553 #define snd_at73c213_mono_switch_info snd_ctl_boolean_mono_info
555 static int snd_at73c213_mono_switch_get(struct snd_kcontrol *kcontrol,
556 struct snd_ctl_elem_value *ucontrol)
558 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
559 int reg = kcontrol->private_value & 0xff;
560 int shift = (kcontrol->private_value >> 8) & 0xff;
561 int invert = (kcontrol->private_value >> 24) & 0xff;
563 mutex_lock(&chip->mixer_lock);
565 ucontrol->value.integer.value[0] =
566 (chip->reg_image[reg] >> shift) & 0x01;
569 ucontrol->value.integer.value[0] =
570 0x01 - ucontrol->value.integer.value[0];
572 mutex_unlock(&chip->mixer_lock);
577 static int snd_at73c213_mono_switch_put(struct snd_kcontrol *kcontrol,
578 struct snd_ctl_elem_value *ucontrol)
580 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
581 int reg = kcontrol->private_value & 0xff;
582 int shift = (kcontrol->private_value >> 8) & 0xff;
583 int mask = (kcontrol->private_value >> 16) & 0xff;
584 int invert = (kcontrol->private_value >> 24) & 0xff;
588 if (ucontrol->value.integer.value[0])
597 mutex_lock(&chip->mixer_lock);
599 val |= (chip->reg_image[reg] & ~(mask << shift));
600 change = val != chip->reg_image[reg];
602 retval = snd_at73c213_write_reg(chip, reg, val);
604 mutex_unlock(&chip->mixer_lock);
612 static int snd_at73c213_pa_volume_info(struct snd_kcontrol *kcontrol,
613 struct snd_ctl_elem_info *uinfo)
615 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
617 uinfo->value.integer.min = 0;
618 uinfo->value.integer.max = ((kcontrol->private_value >> 16) & 0xff) - 1;
623 static int snd_at73c213_line_capture_volume_info(
624 struct snd_kcontrol *kcontrol,
625 struct snd_ctl_elem_info *uinfo)
627 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
629 /* When inverted will give values 0x10001 => 0. */
630 uinfo->value.integer.min = 14;
631 uinfo->value.integer.max = 31;
636 static int snd_at73c213_aux_capture_volume_info(
637 struct snd_kcontrol *kcontrol,
638 struct snd_ctl_elem_info *uinfo)
640 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
642 /* When inverted will give values 0x10001 => 0. */
643 uinfo->value.integer.min = 14;
644 uinfo->value.integer.max = 31;
649 #define AT73C213_MONO_SWITCH(xname, xindex, reg, shift, mask, invert) \
651 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
654 .info = snd_at73c213_mono_switch_info, \
655 .get = snd_at73c213_mono_switch_get, \
656 .put = snd_at73c213_mono_switch_put, \
657 .private_value = (reg | (shift << 8) | (mask << 16) | (invert << 24)) \
660 #define AT73C213_STEREO(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \
662 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
665 .info = snd_at73c213_stereo_info, \
666 .get = snd_at73c213_stereo_get, \
667 .put = snd_at73c213_stereo_put, \
668 .private_value = (left_reg | (right_reg << 8) \
669 | (shift_left << 16) | (shift_right << 19) \
670 | (mask << 24) | (invert << 22)) \
673 static struct snd_kcontrol_new snd_at73c213_controls[] = {
674 AT73C213_STEREO("Master Playback Volume", 0, DAC_LMPG, DAC_RMPG, 0, 0, 0x1f, 1),
675 AT73C213_STEREO("Master Playback Switch", 0, DAC_LMPG, DAC_RMPG, 5, 5, 1, 1),
676 AT73C213_STEREO("PCM Playback Volume", 0, DAC_LLOG, DAC_RLOG, 0, 0, 0x1f, 1),
677 AT73C213_STEREO("PCM Playback Switch", 0, DAC_LLOG, DAC_RLOG, 5, 5, 1, 1),
678 AT73C213_MONO_SWITCH("Mono PA Playback Switch", 0, DAC_CTRL, DAC_CTRL_ONPADRV,
681 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
682 .name = "PA Playback Volume",
684 .info = snd_at73c213_pa_volume_info,
685 .get = snd_at73c213_mono_get,
686 .put = snd_at73c213_mono_put,
687 .private_value = PA_CTRL | (PA_CTRL_APAGAIN << 8) | \
688 (0x0f << 16) | (1 << 24),
690 AT73C213_MONO_SWITCH("PA High Gain Playback Switch", 0, PA_CTRL, PA_CTRL_APALP,
692 AT73C213_MONO_SWITCH("PA Playback Switch", 0, PA_CTRL, PA_CTRL_APAON, 0x01, 0),
694 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
695 .name = "Aux Capture Volume",
697 .info = snd_at73c213_aux_capture_volume_info,
698 .get = snd_at73c213_mono_get,
699 .put = snd_at73c213_mono_put,
700 .private_value = DAC_AUXG | (0 << 8) | (0x1f << 16) | (1 << 24),
702 AT73C213_MONO_SWITCH("Aux Capture Switch", 0, DAC_CTRL, DAC_CTRL_ONAUXIN,
705 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
706 .name = "Line Capture Volume",
708 .info = snd_at73c213_line_capture_volume_info,
709 .get = snd_at73c213_stereo_get,
710 .put = snd_at73c213_stereo_put,
711 .private_value = DAC_LLIG | (DAC_RLIG << 8) | (0 << 16) | (0 << 19)
712 | (0x1f << 24) | (1 << 22),
714 AT73C213_MONO_SWITCH("Line Capture Switch", 0, DAC_CTRL, 0, 0x03, 0),
717 static int snd_at73c213_mixer(struct snd_at73c213 *chip)
719 struct snd_card *card;
722 if (chip == NULL || chip->pcm == NULL)
727 strcpy(card->mixername, chip->pcm->name);
729 for (idx = 0; idx < ARRAY_SIZE(snd_at73c213_controls); idx++) {
730 errval = snd_ctl_add(card,
731 snd_ctl_new1(&snd_at73c213_controls[idx],
740 for (idx = 1; idx < ARRAY_SIZE(snd_at73c213_controls) + 1; idx++) {
741 struct snd_kcontrol *kctl;
742 kctl = snd_ctl_find_numid(card, idx);
744 snd_ctl_remove(card, kctl);
752 static int snd_at73c213_ssc_init(struct snd_at73c213 *chip)
755 * Continuous clock output.
756 * Starts on falling TF.
757 * Delay 1 cycle (1 bit).
758 * Periode is 16 bit (16 - 1).
760 ssc_writel(chip->ssc->regs, TCMR,
762 | SSC_BF(TCMR_START, 4)
763 | SSC_BF(TCMR_STTDLY, 1)
764 | SSC_BF(TCMR_PERIOD, 16 - 1));
766 * Data length is 16 bit (16 - 1).
767 * Transmit MSB first.
768 * Transmit 2 words each transfer.
769 * Frame sync length is 16 bit (16 - 1).
770 * Frame starts on negative pulse.
772 ssc_writel(chip->ssc->regs, TFMR,
773 SSC_BF(TFMR_DATLEN, 16 - 1)
775 | SSC_BF(TFMR_DATNB, 1)
776 | SSC_BF(TFMR_FSLEN, 16 - 1)
777 | SSC_BF(TFMR_FSOS, 1));
782 static int snd_at73c213_chip_init(struct snd_at73c213 *chip)
785 unsigned char dac_ctrl = 0;
787 retval = snd_at73c213_set_bitrate(chip);
791 /* Enable DAC master clock. */
792 retval = clk_enable(chip->board->dac_clk);
796 /* Initialize at73c213 on SPI bus. */
797 retval = snd_at73c213_write_reg(chip, DAC_RST, 0x04);
801 retval = snd_at73c213_write_reg(chip, DAC_RST, 0x03);
805 /* Precharge everything. */
806 retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0xff);
809 retval = snd_at73c213_write_reg(chip, PA_CTRL, (1<<PA_CTRL_APAPRECH));
812 retval = snd_at73c213_write_reg(chip, DAC_CTRL,
813 (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR));
819 /* Stop precharging PA. */
820 retval = snd_at73c213_write_reg(chip, PA_CTRL,
821 (1<<PA_CTRL_APALP) | 0x0f);
827 /* Stop precharging DAC, turn on master power. */
828 retval = snd_at73c213_write_reg(chip, DAC_PRECH, (1<<DAC_PRECH_ONMSTR));
835 dac_ctrl = (1<<DAC_CTRL_ONDACL) | (1<<DAC_CTRL_ONDACR)
836 | (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR);
838 retval = snd_at73c213_write_reg(chip, DAC_CTRL, dac_ctrl);
843 retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
846 retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
849 retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
852 retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
855 retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
858 retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
861 retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
865 /* Enable I2S device, i.e. clock output. */
866 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));
871 clk_disable(chip->board->dac_clk);
876 static int snd_at73c213_dev_free(struct snd_device *device)
878 struct snd_at73c213 *chip = device->device_data;
880 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
881 if (chip->irq >= 0) {
882 free_irq(chip->irq, chip);
889 static int snd_at73c213_dev_init(struct snd_card *card,
890 struct spi_device *spi)
892 static struct snd_device_ops ops = {
893 .dev_free = snd_at73c213_dev_free,
895 struct snd_at73c213 *chip = get_chip(card);
898 irq = chip->ssc->irq;
902 spin_lock_init(&chip->lock);
903 mutex_init(&chip->mixer_lock);
907 retval = clk_enable(chip->ssc->clk);
911 retval = request_irq(irq, snd_at73c213_interrupt, 0, "at73c213", chip);
913 dev_dbg(&chip->spi->dev, "unable to request irq %d\n", irq);
918 memcpy(&chip->reg_image, &snd_at73c213_original_image,
919 sizeof(snd_at73c213_original_image));
921 retval = snd_at73c213_ssc_init(chip);
925 retval = snd_at73c213_chip_init(chip);
929 retval = snd_at73c213_pcm_new(chip, 0);
933 retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
937 retval = snd_at73c213_mixer(chip);
944 snd_device_free(card, chip);
946 free_irq(chip->irq, chip);
949 clk_disable(chip->ssc->clk);
954 static int snd_at73c213_probe(struct spi_device *spi)
956 struct snd_card *card;
957 struct snd_at73c213 *chip;
958 struct at73c213_board_info *board;
962 board = spi->dev.platform_data;
964 dev_dbg(&spi->dev, "no platform_data\n");
968 if (!board->dac_clk) {
969 dev_dbg(&spi->dev, "no DAC clk\n");
973 if (IS_ERR(board->dac_clk)) {
974 dev_dbg(&spi->dev, "no DAC clk\n");
975 return PTR_ERR(board->dac_clk);
978 /* Allocate "card" using some unused identifiers. */
979 snprintf(id, sizeof id, "at73c213_%d", board->ssc_id);
980 retval = snd_card_new(&spi->dev, -1, id, THIS_MODULE,
981 sizeof(struct snd_at73c213), &card);
985 chip = card->private_data;
989 chip->ssc = ssc_request(board->ssc_id);
990 if (IS_ERR(chip->ssc)) {
991 dev_dbg(&spi->dev, "could not get ssc%d device\n",
993 retval = PTR_ERR(chip->ssc);
997 retval = snd_at73c213_dev_init(card, spi);
1001 strcpy(card->driver, "at73c213");
1002 strcpy(card->shortname, board->shortname);
1003 sprintf(card->longname, "%s on irq %d", card->shortname, chip->irq);
1005 retval = snd_card_register(card);
1009 dev_set_drvdata(&spi->dev, card);
1014 ssc_free(chip->ssc);
1016 snd_card_free(card);
1021 static int snd_at73c213_remove(struct spi_device *spi)
1023 struct snd_card *card = dev_get_drvdata(&spi->dev);
1024 struct snd_at73c213 *chip = card->private_data;
1027 /* Stop playback. */
1028 retval = clk_enable(chip->ssc->clk);
1031 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
1032 clk_disable(chip->ssc->clk);
1035 retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
1038 retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
1041 retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
1044 retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
1047 retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
1050 retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
1053 retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
1058 retval = snd_at73c213_write_reg(chip, PA_CTRL,
1059 chip->reg_image[PA_CTRL] | 0x0f);
1063 retval = snd_at73c213_write_reg(chip, PA_CTRL,
1064 (1 << PA_CTRL_APALP) | 0x0f);
1068 /* Turn off external DAC. */
1069 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x0c);
1073 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x00);
1077 /* Turn off master power. */
1078 retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0x00);
1083 /* Stop DAC master clock. */
1084 clk_disable(chip->board->dac_clk);
1086 ssc_free(chip->ssc);
1087 snd_card_free(card);
1092 #ifdef CONFIG_PM_SLEEP
1094 static int snd_at73c213_suspend(struct device *dev)
1096 struct snd_card *card = dev_get_drvdata(dev);
1097 struct snd_at73c213 *chip = card->private_data;
1099 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
1100 clk_disable(chip->ssc->clk);
1101 clk_disable(chip->board->dac_clk);
1106 static int snd_at73c213_resume(struct device *dev)
1108 struct snd_card *card = dev_get_drvdata(dev);
1109 struct snd_at73c213 *chip = card->private_data;
1112 retval = clk_enable(chip->board->dac_clk);
1115 retval = clk_enable(chip->ssc->clk);
1117 clk_disable(chip->board->dac_clk);
1120 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));
1125 static SIMPLE_DEV_PM_OPS(at73c213_pm_ops, snd_at73c213_suspend,
1126 snd_at73c213_resume);
1127 #define AT73C213_PM_OPS (&at73c213_pm_ops)
1130 #define AT73C213_PM_OPS NULL
1133 static struct spi_driver at73c213_driver = {
1136 .pm = AT73C213_PM_OPS,
1138 .probe = snd_at73c213_probe,
1139 .remove = snd_at73c213_remove,
1142 module_spi_driver(at73c213_driver);
1144 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
1145 MODULE_DESCRIPTION("Sound driver for AT73C213 with Atmel SSC");
1146 MODULE_LICENSE("GPL");