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, status;
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 a power of 2. */
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;
213 snd_at73c213_playback_hw.rate_min = chip->bitrate;
214 snd_at73c213_playback_hw.rate_max = chip->bitrate;
215 runtime->hw = snd_at73c213_playback_hw;
216 chip->substream = substream;
221 static int snd_at73c213_pcm_close(struct snd_pcm_substream *substream)
223 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
224 chip->substream = NULL;
228 static int snd_at73c213_pcm_hw_params(struct snd_pcm_substream *substream,
229 struct snd_pcm_hw_params *hw_params)
231 return snd_pcm_lib_malloc_pages(substream,
232 params_buffer_bytes(hw_params));
235 static int snd_at73c213_pcm_hw_free(struct snd_pcm_substream *substream)
237 return snd_pcm_lib_free_pages(substream);
240 static int snd_at73c213_pcm_prepare(struct snd_pcm_substream *substream)
242 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
243 struct snd_pcm_runtime *runtime = substream->runtime;
246 block_size = frames_to_bytes(runtime, runtime->period_size);
250 ssc_writel(chip->ssc->regs, PDC_TPR,
251 (long)runtime->dma_addr);
252 ssc_writel(chip->ssc->regs, PDC_TCR, runtime->period_size * 2);
253 ssc_writel(chip->ssc->regs, PDC_TNPR,
254 (long)runtime->dma_addr + block_size);
255 ssc_writel(chip->ssc->regs, PDC_TNCR, runtime->period_size * 2);
260 static int snd_at73c213_pcm_trigger(struct snd_pcm_substream *substream,
263 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
266 spin_lock(&chip->lock);
269 case SNDRV_PCM_TRIGGER_START:
270 ssc_writel(chip->ssc->regs, IER, SSC_BIT(IER_ENDTX));
271 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTEN));
273 case SNDRV_PCM_TRIGGER_STOP:
274 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTDIS));
275 ssc_writel(chip->ssc->regs, IDR, SSC_BIT(IDR_ENDTX));
278 dev_dbg(&chip->spi->dev, "spurious command %x\n", cmd);
283 spin_unlock(&chip->lock);
288 static snd_pcm_uframes_t
289 snd_at73c213_pcm_pointer(struct snd_pcm_substream *substream)
291 struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
292 struct snd_pcm_runtime *runtime = substream->runtime;
293 snd_pcm_uframes_t pos;
296 bytes = ssc_readl(chip->ssc->regs, PDC_TPR)
297 - (unsigned long)runtime->dma_addr;
299 pos = bytes_to_frames(runtime, bytes);
300 if (pos >= runtime->buffer_size)
301 pos -= runtime->buffer_size;
306 static struct snd_pcm_ops at73c213_playback_ops = {
307 .open = snd_at73c213_pcm_open,
308 .close = snd_at73c213_pcm_close,
309 .ioctl = snd_pcm_lib_ioctl,
310 .hw_params = snd_at73c213_pcm_hw_params,
311 .hw_free = snd_at73c213_pcm_hw_free,
312 .prepare = snd_at73c213_pcm_prepare,
313 .trigger = snd_at73c213_pcm_trigger,
314 .pointer = snd_at73c213_pcm_pointer,
317 static void snd_at73c213_pcm_free(struct snd_pcm *pcm)
319 struct snd_at73c213 *chip = snd_pcm_chip(pcm);
321 snd_pcm_lib_preallocate_free_for_all(chip->pcm);
326 static int __devinit snd_at73c213_pcm_new(struct snd_at73c213 *chip, int device)
331 retval = snd_pcm_new(chip->card, chip->card->shortname,
336 pcm->private_data = chip;
337 pcm->private_free = snd_at73c213_pcm_free;
338 pcm->info_flags = SNDRV_PCM_INFO_BLOCK_TRANSFER;
339 strcpy(pcm->name, "at73c213");
342 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &at73c213_playback_ops);
344 retval = snd_pcm_lib_preallocate_pages_for_all(chip->pcm,
345 SNDRV_DMA_TYPE_DEV, &chip->ssc->pdev->dev,
346 64 * 1024, 64 * 1024);
351 static irqreturn_t snd_at73c213_interrupt(int irq, void *dev_id)
353 struct snd_at73c213 *chip = dev_id;
354 struct snd_pcm_runtime *runtime = chip->substream->runtime;
359 int retval = IRQ_NONE;
361 spin_lock(&chip->lock);
363 block_size = frames_to_bytes(runtime, runtime->period_size);
364 status = ssc_readl(chip->ssc->regs, IMR);
366 if (status & SSC_BIT(IMR_ENDTX)) {
368 if (chip->period == runtime->periods)
370 next_period = chip->period + 1;
371 if (next_period == runtime->periods)
374 offset = block_size * next_period;
376 ssc_writel(chip->ssc->regs, PDC_TNPR,
377 (long)runtime->dma_addr + offset);
378 ssc_writel(chip->ssc->regs, PDC_TNCR, runtime->period_size * 2);
379 retval = IRQ_HANDLED;
382 ssc_readl(chip->ssc->regs, IMR);
383 spin_unlock(&chip->lock);
385 if (status & SSC_BIT(IMR_ENDTX))
386 snd_pcm_period_elapsed(chip->substream);
394 static int snd_at73c213_mono_get(struct snd_kcontrol *kcontrol,
395 struct snd_ctl_elem_value *ucontrol)
397 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
398 int reg = kcontrol->private_value & 0xff;
399 int shift = (kcontrol->private_value >> 8) & 0xff;
400 int mask = (kcontrol->private_value >> 16) & 0xff;
401 int invert = (kcontrol->private_value >> 24) & 0xff;
403 mutex_lock(&chip->mixer_lock);
405 ucontrol->value.integer.value[0] =
406 (chip->reg_image[reg] >> shift) & mask;
409 ucontrol->value.integer.value[0] =
410 mask - ucontrol->value.integer.value[0];
412 mutex_unlock(&chip->mixer_lock);
417 static int snd_at73c213_mono_put(struct snd_kcontrol *kcontrol,
418 struct snd_ctl_elem_value *ucontrol)
420 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
421 int reg = kcontrol->private_value & 0xff;
422 int shift = (kcontrol->private_value >> 8) & 0xff;
423 int mask = (kcontrol->private_value >> 16) & 0xff;
424 int invert = (kcontrol->private_value >> 24) & 0xff;
428 val = (ucontrol->value.integer.value[0] & mask);
433 mutex_lock(&chip->mixer_lock);
435 val = (chip->reg_image[reg] & ~(mask << shift)) | val;
436 change = val != chip->reg_image[reg];
437 retval = snd_at73c213_write_reg(chip, reg, val);
439 mutex_unlock(&chip->mixer_lock);
447 static int snd_at73c213_stereo_info(struct snd_kcontrol *kcontrol,
448 struct snd_ctl_elem_info *uinfo)
450 int mask = (kcontrol->private_value >> 24) & 0xff;
453 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
455 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
458 uinfo->value.integer.min = 0;
459 uinfo->value.integer.max = mask;
464 static int snd_at73c213_stereo_get(struct snd_kcontrol *kcontrol,
465 struct snd_ctl_elem_value *ucontrol)
467 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
468 int left_reg = kcontrol->private_value & 0xff;
469 int right_reg = (kcontrol->private_value >> 8) & 0xff;
470 int shift_left = (kcontrol->private_value >> 16) & 0x07;
471 int shift_right = (kcontrol->private_value >> 19) & 0x07;
472 int mask = (kcontrol->private_value >> 24) & 0xff;
473 int invert = (kcontrol->private_value >> 22) & 1;
475 mutex_lock(&chip->mixer_lock);
477 ucontrol->value.integer.value[0] =
478 (chip->reg_image[left_reg] >> shift_left) & mask;
479 ucontrol->value.integer.value[1] =
480 (chip->reg_image[right_reg] >> shift_right) & mask;
483 ucontrol->value.integer.value[0] =
484 mask - ucontrol->value.integer.value[0];
485 ucontrol->value.integer.value[1] =
486 mask - ucontrol->value.integer.value[1];
489 mutex_unlock(&chip->mixer_lock);
494 static int snd_at73c213_stereo_put(struct snd_kcontrol *kcontrol,
495 struct snd_ctl_elem_value *ucontrol)
497 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
498 int left_reg = kcontrol->private_value & 0xff;
499 int right_reg = (kcontrol->private_value >> 8) & 0xff;
500 int shift_left = (kcontrol->private_value >> 16) & 0x07;
501 int shift_right = (kcontrol->private_value >> 19) & 0x07;
502 int mask = (kcontrol->private_value >> 24) & 0xff;
503 int invert = (kcontrol->private_value >> 22) & 1;
505 unsigned short val1, val2;
507 val1 = ucontrol->value.integer.value[0] & mask;
508 val2 = ucontrol->value.integer.value[1] & mask;
514 val2 <<= shift_right;
516 mutex_lock(&chip->mixer_lock);
518 val1 = (chip->reg_image[left_reg] & ~(mask << shift_left)) | val1;
519 val2 = (chip->reg_image[right_reg] & ~(mask << shift_right)) | val2;
520 change = val1 != chip->reg_image[left_reg]
521 || val2 != chip->reg_image[right_reg];
522 retval = snd_at73c213_write_reg(chip, left_reg, val1);
524 mutex_unlock(&chip->mixer_lock);
527 retval = snd_at73c213_write_reg(chip, right_reg, val2);
529 mutex_unlock(&chip->mixer_lock);
533 mutex_unlock(&chip->mixer_lock);
541 #define snd_at73c213_mono_switch_info snd_ctl_boolean_mono_info
543 static int snd_at73c213_mono_switch_get(struct snd_kcontrol *kcontrol,
544 struct snd_ctl_elem_value *ucontrol)
546 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
547 int reg = kcontrol->private_value & 0xff;
548 int shift = (kcontrol->private_value >> 8) & 0xff;
549 int invert = (kcontrol->private_value >> 24) & 0xff;
551 mutex_lock(&chip->mixer_lock);
553 ucontrol->value.integer.value[0] =
554 (chip->reg_image[reg] >> shift) & 0x01;
557 ucontrol->value.integer.value[0] =
558 0x01 - ucontrol->value.integer.value[0];
560 mutex_unlock(&chip->mixer_lock);
565 static int snd_at73c213_mono_switch_put(struct snd_kcontrol *kcontrol,
566 struct snd_ctl_elem_value *ucontrol)
568 struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
569 int reg = kcontrol->private_value & 0xff;
570 int shift = (kcontrol->private_value >> 8) & 0xff;
571 int mask = (kcontrol->private_value >> 16) & 0xff;
572 int invert = (kcontrol->private_value >> 24) & 0xff;
576 if (ucontrol->value.integer.value[0])
585 mutex_lock(&chip->mixer_lock);
587 val |= (chip->reg_image[reg] & ~(mask << shift));
588 change = val != chip->reg_image[reg];
590 retval = snd_at73c213_write_reg(chip, reg, val);
592 mutex_unlock(&chip->mixer_lock);
600 static int snd_at73c213_pa_volume_info(struct snd_kcontrol *kcontrol,
601 struct snd_ctl_elem_info *uinfo)
603 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
605 uinfo->value.integer.min = 0;
606 uinfo->value.integer.max = ((kcontrol->private_value >> 16) & 0xff) - 1;
611 static int snd_at73c213_line_capture_volume_info(
612 struct snd_kcontrol *kcontrol,
613 struct snd_ctl_elem_info *uinfo)
615 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
617 /* When inverted will give values 0x10001 => 0. */
618 uinfo->value.integer.min = 14;
619 uinfo->value.integer.max = 31;
624 static int snd_at73c213_aux_capture_volume_info(
625 struct snd_kcontrol *kcontrol,
626 struct snd_ctl_elem_info *uinfo)
628 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
630 /* When inverted will give values 0x10001 => 0. */
631 uinfo->value.integer.min = 14;
632 uinfo->value.integer.max = 31;
637 #define AT73C213_MONO_SWITCH(xname, xindex, reg, shift, mask, invert) \
639 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
642 .info = snd_at73c213_mono_switch_info, \
643 .get = snd_at73c213_mono_switch_get, \
644 .put = snd_at73c213_mono_switch_put, \
645 .private_value = (reg | (shift << 8) | (mask << 16) | (invert << 24)) \
648 #define AT73C213_STEREO(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \
650 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
653 .info = snd_at73c213_stereo_info, \
654 .get = snd_at73c213_stereo_get, \
655 .put = snd_at73c213_stereo_put, \
656 .private_value = (left_reg | (right_reg << 8) \
657 | (shift_left << 16) | (shift_right << 19) \
658 | (mask << 24) | (invert << 22)) \
661 static struct snd_kcontrol_new snd_at73c213_controls[] __devinitdata = {
662 AT73C213_STEREO("Master Playback Volume", 0, DAC_LMPG, DAC_RMPG, 0, 0, 0x1f, 1),
663 AT73C213_STEREO("Master Playback Switch", 0, DAC_LMPG, DAC_RMPG, 5, 5, 1, 1),
664 AT73C213_STEREO("PCM Playback Volume", 0, DAC_LLOG, DAC_RLOG, 0, 0, 0x1f, 1),
665 AT73C213_STEREO("PCM Playback Switch", 0, DAC_LLOG, DAC_RLOG, 5, 5, 1, 1),
666 AT73C213_MONO_SWITCH("Mono PA Playback Switch", 0, DAC_CTRL, DAC_CTRL_ONPADRV,
669 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
670 .name = "PA Playback Volume",
672 .info = snd_at73c213_pa_volume_info,
673 .get = snd_at73c213_mono_get,
674 .put = snd_at73c213_mono_put,
675 .private_value = PA_CTRL | (PA_CTRL_APAGAIN << 8) | \
676 (0x0f << 16) | (1 << 24),
678 AT73C213_MONO_SWITCH("PA High Gain Playback Switch", 0, PA_CTRL, PA_CTRL_APALP,
680 AT73C213_MONO_SWITCH("PA Playback Switch", 0, PA_CTRL, PA_CTRL_APAON, 0x01, 0),
682 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
683 .name = "Aux Capture Volume",
685 .info = snd_at73c213_aux_capture_volume_info,
686 .get = snd_at73c213_mono_get,
687 .put = snd_at73c213_mono_put,
688 .private_value = DAC_AUXG | (0 << 8) | (0x1f << 16) | (1 << 24),
690 AT73C213_MONO_SWITCH("Aux Capture Switch", 0, DAC_CTRL, DAC_CTRL_ONAUXIN,
693 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
694 .name = "Line Capture Volume",
696 .info = snd_at73c213_line_capture_volume_info,
697 .get = snd_at73c213_stereo_get,
698 .put = snd_at73c213_stereo_put,
699 .private_value = DAC_LLIG | (DAC_RLIG << 8) | (0 << 16) | (0 << 19)
700 | (0x1f << 24) | (1 << 22),
702 AT73C213_MONO_SWITCH("Line Capture Switch", 0, DAC_CTRL, 0, 0x03, 0),
705 static int __devinit snd_at73c213_mixer(struct snd_at73c213 *chip)
707 struct snd_card *card;
710 if (chip == NULL || chip->pcm == NULL)
715 strcpy(card->mixername, chip->pcm->name);
717 for (idx = 0; idx < ARRAY_SIZE(snd_at73c213_controls); idx++) {
718 errval = snd_ctl_add(card,
719 snd_ctl_new1(&snd_at73c213_controls[idx],
728 for (idx = 1; idx < ARRAY_SIZE(snd_at73c213_controls) + 1; idx++) {
729 struct snd_kcontrol *kctl;
730 kctl = snd_ctl_find_numid(card, idx);
732 snd_ctl_remove(card, kctl);
740 static int snd_at73c213_ssc_init(struct snd_at73c213 *chip)
743 * Continuous clock output.
744 * Starts on falling TF.
745 * Delay 1 cycle (1 bit).
746 * Periode is 16 bit (16 - 1).
748 ssc_writel(chip->ssc->regs, TCMR,
750 | SSC_BF(TCMR_START, 4)
751 | SSC_BF(TCMR_STTDLY, 1)
752 | SSC_BF(TCMR_PERIOD, 16 - 1));
754 * Data length is 16 bit (16 - 1).
755 * Transmit MSB first.
756 * Transmit 2 words each transfer.
757 * Frame sync length is 16 bit (16 - 1).
758 * Frame starts on negative pulse.
760 ssc_writel(chip->ssc->regs, TFMR,
761 SSC_BF(TFMR_DATLEN, 16 - 1)
763 | SSC_BF(TFMR_DATNB, 1)
764 | SSC_BF(TFMR_FSLEN, 16 - 1)
765 | SSC_BF(TFMR_FSOS, 1));
770 static int snd_at73c213_chip_init(struct snd_at73c213 *chip)
773 unsigned char dac_ctrl = 0;
775 retval = snd_at73c213_set_bitrate(chip);
779 /* Enable DAC master clock. */
780 clk_enable(chip->board->dac_clk);
782 /* Initialize at73c213 on SPI bus. */
783 retval = snd_at73c213_write_reg(chip, DAC_RST, 0x04);
787 retval = snd_at73c213_write_reg(chip, DAC_RST, 0x03);
791 /* Precharge everything. */
792 retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0xff);
795 retval = snd_at73c213_write_reg(chip, PA_CTRL, (1<<PA_CTRL_APAPRECH));
798 retval = snd_at73c213_write_reg(chip, DAC_CTRL,
799 (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR));
805 /* Stop precharging PA. */
806 retval = snd_at73c213_write_reg(chip, PA_CTRL,
807 (1<<PA_CTRL_APALP) | 0x0f);
813 /* Stop precharging DAC, turn on master power. */
814 retval = snd_at73c213_write_reg(chip, DAC_PRECH, (1<<DAC_PRECH_ONMSTR));
821 dac_ctrl = (1<<DAC_CTRL_ONDACL) | (1<<DAC_CTRL_ONDACR)
822 | (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR);
824 retval = snd_at73c213_write_reg(chip, DAC_CTRL, dac_ctrl);
829 retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
832 retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
835 retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
838 retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
841 retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
844 retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
847 retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
851 /* Enable I2S device, i.e. clock output. */
852 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));
857 clk_disable(chip->board->dac_clk);
862 static int snd_at73c213_dev_free(struct snd_device *device)
864 struct snd_at73c213 *chip = device->device_data;
866 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
867 if (chip->irq >= 0) {
868 free_irq(chip->irq, chip);
875 static int __devinit snd_at73c213_dev_init(struct snd_card *card,
876 struct spi_device *spi)
878 static struct snd_device_ops ops = {
879 .dev_free = snd_at73c213_dev_free,
881 struct snd_at73c213 *chip = get_chip(card);
884 irq = chip->ssc->irq;
888 spin_lock_init(&chip->lock);
889 mutex_init(&chip->mixer_lock);
893 retval = request_irq(irq, snd_at73c213_interrupt, 0, "at73c213", chip);
895 dev_dbg(&chip->spi->dev, "unable to request irq %d\n", irq);
900 memcpy(&chip->reg_image, &snd_at73c213_original_image,
901 sizeof(snd_at73c213_original_image));
903 retval = snd_at73c213_ssc_init(chip);
907 retval = snd_at73c213_chip_init(chip);
911 retval = snd_at73c213_pcm_new(chip, 0);
915 retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
919 retval = snd_at73c213_mixer(chip);
923 snd_card_set_dev(card, &spi->dev);
928 snd_device_free(card, chip);
930 free_irq(chip->irq, chip);
936 static int snd_at73c213_probe(struct spi_device *spi)
938 struct snd_card *card;
939 struct snd_at73c213 *chip;
940 struct at73c213_board_info *board;
944 board = spi->dev.platform_data;
946 dev_dbg(&spi->dev, "no platform_data\n");
950 if (!board->dac_clk) {
951 dev_dbg(&spi->dev, "no DAC clk\n");
955 if (IS_ERR(board->dac_clk)) {
956 dev_dbg(&spi->dev, "no DAC clk\n");
957 return PTR_ERR(board->dac_clk);
962 /* Allocate "card" using some unused identifiers. */
963 snprintf(id, sizeof id, "at73c213_%d", board->ssc_id);
964 card = snd_card_new(-1, id, THIS_MODULE, sizeof(struct snd_at73c213));
968 chip = card->private_data;
972 chip->ssc = ssc_request(board->ssc_id);
973 if (IS_ERR(chip->ssc)) {
974 dev_dbg(&spi->dev, "could not get ssc%d device\n",
976 retval = PTR_ERR(chip->ssc);
980 retval = snd_at73c213_dev_init(card, spi);
984 strcpy(card->driver, "at73c213");
985 strcpy(card->shortname, board->shortname);
986 sprintf(card->longname, "%s on irq %d", card->shortname, chip->irq);
988 retval = snd_card_register(card);
992 dev_set_drvdata(&spi->dev, card);
1004 static int __devexit snd_at73c213_remove(struct spi_device *spi)
1006 struct snd_card *card = dev_get_drvdata(&spi->dev);
1007 struct snd_at73c213 *chip = card->private_data;
1010 /* Stop playback. */
1011 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
1014 retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
1017 retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
1020 retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
1023 retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
1026 retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
1029 retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
1032 retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
1037 retval = snd_at73c213_write_reg(chip, PA_CTRL,
1038 chip->reg_image[PA_CTRL] | 0x0f);
1042 retval = snd_at73c213_write_reg(chip, PA_CTRL,
1043 (1 << PA_CTRL_APALP) | 0x0f);
1047 /* Turn off external DAC. */
1048 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x0c);
1052 retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x00);
1056 /* Turn off master power. */
1057 retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0x00);
1062 /* Stop DAC master clock. */
1063 clk_disable(chip->board->dac_clk);
1065 ssc_free(chip->ssc);
1066 snd_card_free(card);
1067 dev_set_drvdata(&spi->dev, NULL);
1073 static int snd_at73c213_suspend(struct spi_device *spi, pm_message_t msg)
1075 struct snd_card *card = dev_get_drvdata(&spi->dev);
1076 struct snd_at73c213 *chip = card->private_data;
1078 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
1079 clk_disable(chip->board->dac_clk);
1084 static int snd_at73c213_resume(struct spi_device *spi)
1086 struct snd_card *card = dev_get_drvdata(&spi->dev);
1087 struct snd_at73c213 *chip = card->private_data;
1089 clk_enable(chip->board->dac_clk);
1090 ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));
1095 #define snd_at73c213_suspend NULL
1096 #define snd_at73c213_resume NULL
1099 static struct spi_driver at73c213_driver = {
1103 .probe = snd_at73c213_probe,
1104 .suspend = snd_at73c213_suspend,
1105 .resume = snd_at73c213_resume,
1106 .remove = __devexit_p(snd_at73c213_remove),
1109 static int __init at73c213_init(void)
1111 return spi_register_driver(&at73c213_driver);
1113 module_init(at73c213_init);
1115 static void __exit at73c213_exit(void)
1117 spi_unregister_driver(&at73c213_driver);
1119 module_exit(at73c213_exit);
1121 MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
1122 MODULE_DESCRIPTION("Sound driver for AT73C213 with Atmel SSC");
1123 MODULE_LICENSE("GPL");