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;
73 struct ssc_device *ssc;
74 struct spi_device *spi;
77 /* Image of the SPI registers in AT73C213. */
79 /* Protect SSC registers against concurrent access. */
81 /* Protect mixer registers against concurrent access. */
82 struct mutex mixer_lock;
85 #define get_chip(card) ((struct snd_at73c213 *)card->private_data)
88 snd_at73c213_write_reg(struct snd_at73c213 *chip, u8 reg, u8 val)
90 struct spi_message msg;
91 struct spi_transfer msg_xfer = {
97 spi_message_init(&msg);
99 chip->spi_wbuffer[0] = reg;
100 chip->spi_wbuffer[1] = val;
102 msg_xfer.tx_buf = chip->spi_wbuffer;
103 msg_xfer.rx_buf = chip->spi_rbuffer;
104 spi_message_add_tail(&msg_xfer, &msg);
106 retval = spi_sync(chip->spi, &msg);
109 chip->reg_image[reg] = val;
114 static struct snd_pcm_hardware snd_at73c213_playback_hw = {
115 .info = SNDRV_PCM_INFO_INTERLEAVED |
116 SNDRV_PCM_INFO_BLOCK_TRANSFER,
117 .formats = SNDRV_PCM_FMTBIT_S16_BE,
118 .rates = SNDRV_PCM_RATE_CONTINUOUS,
119 .rate_min = 8000, /* Replaced by chip->bitrate later. */
120 .rate_max = 50000, /* Replaced by chip->bitrate later. */
123 .buffer_bytes_max = 64 * 1024 - 1,
124 .period_bytes_min = 512,
125 .period_bytes_max = 64 * 1024 - 1,
131 * Calculate and set bitrate and divisions.
133 static int snd_at73c213_set_bitrate(struct snd_at73c213 *chip)
135 unsigned long ssc_rate = clk_get_rate(chip->ssc->clk);
136 unsigned long dac_rate_new, ssc_div;
138 unsigned long ssc_div_max, ssc_div_min;
142 * We connect two clocks here, picking divisors so the I2S clocks
143 * out data at the same rate the DAC clocks it in ... and as close
144 * as practical to the desired target rate.
146 * The DAC master clock (MCLK) is programmable, and is either 256
147 * or (not here) 384 times the I2S output clock (BCLK).
150 /* SSC clock / (bitrate * stereo * 16-bit). */
151 ssc_div = ssc_rate / (BITRATE_TARGET * 2 * 16);
152 ssc_div_min = ssc_rate / (BITRATE_MAX * 2 * 16);
153 ssc_div_max = ssc_rate / (BITRATE_MIN * 2 * 16);
154 max_tries = (ssc_div_max - ssc_div_min) / 2;
159 /* ssc_div must be a power of 2. */
160 ssc_div = (ssc_div + 1) & ~1UL;
162 if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN) {
164 if ((ssc_rate / (ssc_div * 2 * 16)) > BITRATE_MAX)
168 /* Search for a possible bitrate. */
170 /* SSC clock / (ssc divider * 16-bit * stereo). */
171 if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN)
174 /* 256 / (2 * 16) = 8 */
175 dac_rate_new = 8 * (ssc_rate / ssc_div);
177 status = clk_round_rate(chip->board->dac_clk, dac_rate_new);
181 /* Ignore difference smaller than 256 Hz. */
182 if ((status/256) == (dac_rate_new/256))
186 } while (--max_tries);
188 /* Not able to find a valid bitrate. */
192 status = clk_set_rate(chip->board->dac_clk, status);
196 /* Set divider in SSC device. */
197 ssc_writel(chip->ssc->regs, CMR, ssc_div/2);
199 /* SSC clock / (ssc divider * 16-bit * stereo). */
200 chip->bitrate = ssc_rate / (ssc_div * 16 * 2);
202 dev_info(&chip->spi->dev,
203 "at73c213: supported bitrate is %lu (%lu divider)\n",
204 chip->bitrate, ssc_div);
209 static int snd_at73c213_pcm_open(struct snd_pcm_substream *substream)
211 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
212 struct snd_pcm_runtime *runtime = substream->runtime;
214 snd_at73c213_playback_hw.rate_min = chip->bitrate;
215 snd_at73c213_playback_hw.rate_max = chip->bitrate;
216 runtime->hw = snd_at73c213_playback_hw;
217 chip->substream = substream;
222 static int snd_at73c213_pcm_close(struct snd_pcm_substream *substream)
224 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
225 chip->substream = NULL;
229 static int snd_at73c213_pcm_hw_params(struct snd_pcm_substream *substream,
230 struct snd_pcm_hw_params *hw_params)
232 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
233 int channels = params_channels(hw_params);
236 val = ssc_readl(chip->ssc->regs, TFMR);
237 val = SSC_BFINS(TFMR_DATNB, channels - 1, val);
238 ssc_writel(chip->ssc->regs, TFMR, val);
240 return snd_pcm_lib_malloc_pages(substream,
241 params_buffer_bytes(hw_params));
244 static int snd_at73c213_pcm_hw_free(struct snd_pcm_substream *substream)
246 return snd_pcm_lib_free_pages(substream);
249 static int snd_at73c213_pcm_prepare(struct snd_pcm_substream *substream)
251 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
252 struct snd_pcm_runtime *runtime = substream->runtime;
255 block_size = frames_to_bytes(runtime, runtime->period_size);
259 ssc_writel(chip->ssc->regs, PDC_TPR,
260 (long)runtime->dma_addr);
261 ssc_writel(chip->ssc->regs, PDC_TCR,
262 runtime->period_size * runtime->channels);
263 ssc_writel(chip->ssc->regs, PDC_TNPR,
264 (long)runtime->dma_addr + block_size);
265 ssc_writel(chip->ssc->regs, PDC_TNCR,
266 runtime->period_size * runtime->channels);
271 static int snd_at73c213_pcm_trigger(struct snd_pcm_substream *substream,
274 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
277 spin_lock(&chip->lock);
280 case SNDRV_PCM_TRIGGER_START:
281 ssc_writel(chip->ssc->regs, IER, SSC_BIT(IER_ENDTX));
282 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTEN));
284 case SNDRV_PCM_TRIGGER_STOP:
285 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTDIS));
286 ssc_writel(chip->ssc->regs, IDR, SSC_BIT(IDR_ENDTX));
289 dev_dbg(&chip->spi->dev, "spurious command %x\n", cmd);
294 spin_unlock(&chip->lock);
299 static snd_pcm_uframes_t
300 snd_at73c213_pcm_pointer(struct snd_pcm_substream *substream)
302 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
303 struct snd_pcm_runtime *runtime = substream->runtime;
304 snd_pcm_uframes_t pos;
307 bytes = ssc_readl(chip->ssc->regs, PDC_TPR)
308 - (unsigned long)runtime->dma_addr;
310 pos = bytes_to_frames(runtime, bytes);
311 if (pos >= runtime->buffer_size)
312 pos -= runtime->buffer_size;
317 static struct snd_pcm_ops at73c213_playback_ops = {
318 .open = snd_at73c213_pcm_open,
319 .close = snd_at73c213_pcm_close,
320 .ioctl = snd_pcm_lib_ioctl,
321 .hw_params = snd_at73c213_pcm_hw_params,
322 .hw_free = snd_at73c213_pcm_hw_free,
323 .prepare = snd_at73c213_pcm_prepare,
324 .trigger = snd_at73c213_pcm_trigger,
325 .pointer = snd_at73c213_pcm_pointer,
328 static void snd_at73c213_pcm_free(struct snd_pcm *pcm)
330 struct snd_at73c213 *chip = snd_pcm_chip(pcm);
332 snd_pcm_lib_preallocate_free_for_all(chip->pcm);
337 static int __devinit snd_at73c213_pcm_new(struct snd_at73c213 *chip, int device)
342 retval = snd_pcm_new(chip->card, chip->card->shortname,
347 pcm->private_data = chip;
348 pcm->private_free = snd_at73c213_pcm_free;
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[] __devinitdata = {
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 __devinit 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 __devinit 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 __devinit 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 clk_enable(chip->board->dac_clk);
794 /* Initialize at73c213 on SPI bus. */
795 retval = snd_at73c213_write_reg(chip, DAC_RST, 0x04);
799 retval = snd_at73c213_write_reg(chip, DAC_RST, 0x03);
803 /* Precharge everything. */
804 retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0xff);
807 retval = snd_at73c213_write_reg(chip, PA_CTRL, (1<<PA_CTRL_APAPRECH));
810 retval = snd_at73c213_write_reg(chip, DAC_CTRL,
811 (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR));
817 /* Stop precharging PA. */
818 retval = snd_at73c213_write_reg(chip, PA_CTRL,
819 (1<<PA_CTRL_APALP) | 0x0f);
825 /* Stop precharging DAC, turn on master power. */
826 retval = snd_at73c213_write_reg(chip, DAC_PRECH, (1<<DAC_PRECH_ONMSTR));
833 dac_ctrl = (1<<DAC_CTRL_ONDACL) | (1<<DAC_CTRL_ONDACR)
834 | (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR);
836 retval = snd_at73c213_write_reg(chip, DAC_CTRL, dac_ctrl);
841 retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
844 retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
847 retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
850 retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
853 retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
856 retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
859 retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
863 /* Enable I2S device, i.e. clock output. */
864 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));
869 clk_disable(chip->board->dac_clk);
874 static int snd_at73c213_dev_free(struct snd_device *device)
876 struct snd_at73c213 *chip = device->device_data;
878 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
879 if (chip->irq >= 0) {
880 free_irq(chip->irq, chip);
887 static int __devinit snd_at73c213_dev_init(struct snd_card *card,
888 struct spi_device *spi)
890 static struct snd_device_ops ops = {
891 .dev_free = snd_at73c213_dev_free,
893 struct snd_at73c213 *chip = get_chip(card);
896 irq = chip->ssc->irq;
900 spin_lock_init(&chip->lock);
901 mutex_init(&chip->mixer_lock);
905 retval = request_irq(irq, snd_at73c213_interrupt, 0, "at73c213", chip);
907 dev_dbg(&chip->spi->dev, "unable to request irq %d\n", irq);
912 memcpy(&chip->reg_image, &snd_at73c213_original_image,
913 sizeof(snd_at73c213_original_image));
915 retval = snd_at73c213_ssc_init(chip);
919 retval = snd_at73c213_chip_init(chip);
923 retval = snd_at73c213_pcm_new(chip, 0);
927 retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
931 retval = snd_at73c213_mixer(chip);
935 snd_card_set_dev(card, &spi->dev);
940 snd_device_free(card, chip);
942 free_irq(chip->irq, chip);
948 static int __devinit snd_at73c213_probe(struct spi_device *spi)
950 struct snd_card *card;
951 struct snd_at73c213 *chip;
952 struct at73c213_board_info *board;
956 board = spi->dev.platform_data;
958 dev_dbg(&spi->dev, "no platform_data\n");
962 if (!board->dac_clk) {
963 dev_dbg(&spi->dev, "no DAC clk\n");
967 if (IS_ERR(board->dac_clk)) {
968 dev_dbg(&spi->dev, "no DAC clk\n");
969 return PTR_ERR(board->dac_clk);
974 /* Allocate "card" using some unused identifiers. */
975 snprintf(id, sizeof id, "at73c213_%d", board->ssc_id);
976 card = snd_card_new(-1, id, THIS_MODULE, sizeof(struct snd_at73c213));
980 chip = card->private_data;
984 chip->ssc = ssc_request(board->ssc_id);
985 if (IS_ERR(chip->ssc)) {
986 dev_dbg(&spi->dev, "could not get ssc%d device\n",
988 retval = PTR_ERR(chip->ssc);
992 retval = snd_at73c213_dev_init(card, spi);
996 strcpy(card->driver, "at73c213");
997 strcpy(card->shortname, board->shortname);
998 sprintf(card->longname, "%s on irq %d", card->shortname, chip->irq);
1000 retval = snd_card_register(card);
1004 dev_set_drvdata(&spi->dev, card);
1009 ssc_free(chip->ssc);
1011 snd_card_free(card);
1016 static int __devexit snd_at73c213_remove(struct spi_device *spi)
1018 struct snd_card *card = dev_get_drvdata(&spi->dev);
1019 struct snd_at73c213 *chip = card->private_data;
1022 /* Stop playback. */
1023 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
1026 retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
1029 retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
1032 retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
1035 retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
1038 retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
1041 retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
1044 retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
1049 retval = snd_at73c213_write_reg(chip, PA_CTRL,
1050 chip->reg_image[PA_CTRL] | 0x0f);
1054 retval = snd_at73c213_write_reg(chip, PA_CTRL,
1055 (1 << PA_CTRL_APALP) | 0x0f);
1059 /* Turn off external DAC. */
1060 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x0c);
1064 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x00);
1068 /* Turn off master power. */
1069 retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0x00);
1074 /* Stop DAC master clock. */
1075 clk_disable(chip->board->dac_clk);
1077 ssc_free(chip->ssc);
1078 snd_card_free(card);
1079 dev_set_drvdata(&spi->dev, NULL);
1085 static int snd_at73c213_suspend(struct spi_device *spi, pm_message_t msg)
1087 struct snd_card *card = dev_get_drvdata(&spi->dev);
1088 struct snd_at73c213 *chip = card->private_data;
1090 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
1091 clk_disable(chip->board->dac_clk);
1096 static int snd_at73c213_resume(struct spi_device *spi)
1098 struct snd_card *card = dev_get_drvdata(&spi->dev);
1099 struct snd_at73c213 *chip = card->private_data;
1101 clk_enable(chip->board->dac_clk);
1102 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));
1107 #define snd_at73c213_suspend NULL
1108 #define snd_at73c213_resume NULL
1111 static struct spi_driver at73c213_driver = {
1115 .probe = snd_at73c213_probe,
1116 .suspend = snd_at73c213_suspend,
1117 .resume = snd_at73c213_resume,
1118 .remove = __devexit_p(snd_at73c213_remove),
1121 static int __init at73c213_init(void)
1123 return spi_register_driver(&at73c213_driver);
1125 module_init(at73c213_init);
1127 static void __exit at73c213_exit(void)
1129 spi_unregister_driver(&at73c213_driver);
1131 module_exit(at73c213_exit);
1133 MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
1134 MODULE_DESCRIPTION("Sound driver for AT73C213 with Atmel SSC");
1135 MODULE_LICENSE("GPL");