1 // SPDX-License-Identifier: GPL-2.0-only
3 * i2sbus driver -- pcm routines
5 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
9 #include <linux/delay.h>
10 #include <linux/slab.h>
11 #include <sound/core.h>
12 #include <asm/macio.h>
13 #include <linux/pci.h>
14 #include <linux/module.h>
15 #include "../soundbus.h"
18 static inline void get_pcm_info(struct i2sbus_dev *i2sdev, int in,
19 struct pcm_info **pi, struct pcm_info **other)
25 *other = &i2sdev->out;
34 static int clock_and_divisors(int mclk, int sclk, int rate, int *out)
36 /* sclk must be derived from mclk! */
39 /* derive sclk register value */
40 if (i2s_sf_sclkdiv(mclk / sclk, out))
43 if (I2S_CLOCK_SPEED_18MHz % (rate * mclk) == 0) {
44 if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_18MHz / (rate * mclk), out)) {
45 *out |= I2S_SF_CLOCK_SOURCE_18MHz;
49 if (I2S_CLOCK_SPEED_45MHz % (rate * mclk) == 0) {
50 if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_45MHz / (rate * mclk), out)) {
51 *out |= I2S_SF_CLOCK_SOURCE_45MHz;
55 if (I2S_CLOCK_SPEED_49MHz % (rate * mclk) == 0) {
56 if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_49MHz / (rate * mclk), out)) {
57 *out |= I2S_SF_CLOCK_SOURCE_49MHz;
64 #define CHECK_RATE(rate) \
65 do { if (rates & SNDRV_PCM_RATE_ ##rate) { \
67 if (clock_and_divisors(sysclock_factor, \
68 bus_factor, rate, &dummy)) \
69 rates &= ~SNDRV_PCM_RATE_ ##rate; \
72 static int i2sbus_pcm_open(struct i2sbus_dev *i2sdev, int in)
74 struct pcm_info *pi, *other;
75 struct soundbus_dev *sdev;
76 int masks_inited = 0, err;
77 struct codec_info_item *cii, *rev;
78 struct snd_pcm_hardware *hw;
80 unsigned int rates = 0;
81 struct transfer_info v;
83 int bus_factor = 0, sysclock_factor = 0;
86 mutex_lock(&i2sdev->lock);
88 get_pcm_info(i2sdev, in, &pi, &other);
90 hw = &pi->substream->runtime->hw;
91 sdev = &i2sdev->sound;
99 /* we now need to assign the hw */
100 list_for_each_entry(cii, &sdev->codec_list, list) {
101 struct transfer_info *ti = cii->codec->transfers;
102 bus_factor = cii->codec->bus_factor;
103 sysclock_factor = cii->codec->sysclock_factor;
104 while (ti->formats && ti->rates) {
106 if (ti->transfer_in == in
107 && cii->codec->usable(cii, ti, &v)) {
109 formats &= v.formats;
120 if (!masks_inited || !bus_factor || !sysclock_factor) {
124 /* bus dependent stuff */
125 hw->info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
126 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_RESUME |
127 SNDRV_PCM_INFO_JOINT_DUPLEX;
144 /* well. the codec might want 24 bits only, and we'll
145 * ever only transfer 24 bits, but they are top-aligned!
146 * So for alsa, we claim that we're doing full 32 bit
147 * while in reality we'll ignore the lower 8 bits of
148 * that when doing playback (they're transferred as 0
149 * as far as I know, no codecs we have are 32-bit capable
150 * so I can't really test) and when doing recording we'll
151 * always have those lower 8 bits recorded as 0 */
152 if (formats & SNDRV_PCM_FMTBIT_S24_BE)
153 formats |= SNDRV_PCM_FMTBIT_S32_BE;
154 if (formats & SNDRV_PCM_FMTBIT_U24_BE)
155 formats |= SNDRV_PCM_FMTBIT_U32_BE;
156 /* now mask off what we can support. I suppose we could
157 * also support S24_3LE and some similar formats, but I
158 * doubt there's a codec that would be able to use that,
159 * so we don't support it here. */
160 hw->formats = formats & (SNDRV_PCM_FMTBIT_S16_BE |
161 SNDRV_PCM_FMTBIT_U16_BE |
162 SNDRV_PCM_FMTBIT_S32_BE |
163 SNDRV_PCM_FMTBIT_U32_BE);
165 /* we need to set the highest and lowest rate possible.
166 * These are the highest and lowest rates alsa can
167 * support properly in its bitfield.
168 * Below, we'll use that to restrict to the rate
169 * currently in use (if any). */
171 hw->rate_max = 192000;
172 /* if the other stream is active, then we can only
173 * support what it is currently using.
174 * FIXME: I lied. This comment is wrong. We can support
175 * anything that works with the same serial format, ie.
176 * when recording 24 bit sound we can well play 16 bit
177 * sound at the same time iff using the same transfer mode.
180 /* FIXME: is this guaranteed by the alsa api? */
181 hw->formats &= pcm_format_to_bits(i2sdev->format);
182 /* see above, restrict rates to the one we already have */
183 hw->rate_min = i2sdev->rate;
184 hw->rate_max = i2sdev->rate;
187 hw->channels_min = 2;
188 hw->channels_max = 2;
189 /* these are somewhat arbitrary */
190 hw->buffer_bytes_max = 131072;
191 hw->period_bytes_min = 256;
192 hw->period_bytes_max = 16384;
194 hw->periods_max = MAX_DBDMA_COMMANDS;
195 err = snd_pcm_hw_constraint_integer(pi->substream->runtime,
196 SNDRV_PCM_HW_PARAM_PERIODS);
201 list_for_each_entry(cii, &sdev->codec_list, list) {
202 if (cii->codec->open) {
203 err = cii->codec->open(cii, pi->substream);
208 list_for_each_entry_reverse(rev,
209 &sdev->codec_list, list) {
210 if (found_this && rev->codec->close) {
211 rev->codec->close(rev,
223 mutex_unlock(&i2sdev->lock);
229 static int i2sbus_pcm_close(struct i2sbus_dev *i2sdev, int in)
231 struct codec_info_item *cii;
235 mutex_lock(&i2sdev->lock);
237 get_pcm_info(i2sdev, in, &pi, NULL);
239 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
240 if (cii->codec->close) {
241 tmp = cii->codec->close(cii, pi->substream);
247 pi->substream = NULL;
249 mutex_unlock(&i2sdev->lock);
253 static void i2sbus_wait_for_stop(struct i2sbus_dev *i2sdev,
257 DECLARE_COMPLETION_ONSTACK(done);
260 spin_lock_irqsave(&i2sdev->low_lock, flags);
261 if (pi->dbdma_ring.stopping) {
262 pi->stop_completion = &done;
263 spin_unlock_irqrestore(&i2sdev->low_lock, flags);
264 timeout = wait_for_completion_timeout(&done, HZ);
265 spin_lock_irqsave(&i2sdev->low_lock, flags);
266 pi->stop_completion = NULL;
268 /* timeout expired, stop dbdma forcefully */
269 printk(KERN_ERR "i2sbus_wait_for_stop: timed out\n");
270 /* make sure RUN, PAUSE and S0 bits are cleared */
271 out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
272 pi->dbdma_ring.stopping = 0;
274 while (in_le32(&pi->dbdma->status) & ACTIVE) {
281 spin_unlock_irqrestore(&i2sdev->low_lock, flags);
285 void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev)
289 get_pcm_info(i2sdev, 0, &pi, NULL);
290 i2sbus_wait_for_stop(i2sdev, pi);
291 get_pcm_info(i2sdev, 1, &pi, NULL);
292 i2sbus_wait_for_stop(i2sdev, pi);
296 static inline int i2sbus_hw_free(struct snd_pcm_substream *substream, int in)
298 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
301 get_pcm_info(i2sdev, in, &pi, NULL);
302 if (pi->dbdma_ring.stopping)
303 i2sbus_wait_for_stop(i2sdev, pi);
307 static int i2sbus_playback_hw_free(struct snd_pcm_substream *substream)
309 return i2sbus_hw_free(substream, 0);
312 static int i2sbus_record_hw_free(struct snd_pcm_substream *substream)
314 return i2sbus_hw_free(substream, 1);
317 static int i2sbus_pcm_prepare(struct i2sbus_dev *i2sdev, int in)
319 /* whee. Hard work now. The user has selected a bitrate
320 * and bit format, so now we have to program our
321 * I2S controller appropriately. */
322 struct snd_pcm_runtime *runtime;
323 struct dbdma_cmd *command;
324 int i, periodsize, nperiods;
327 struct codec_info_item *cii;
328 int sfr = 0; /* serial format register */
329 int dws = 0; /* data word sizes reg */
331 struct pcm_info *pi, *other;
334 unsigned int cmd, stopaddr;
336 mutex_lock(&i2sdev->lock);
338 get_pcm_info(i2sdev, in, &pi, &other);
340 if (pi->dbdma_ring.running) {
344 if (pi->dbdma_ring.stopping)
345 i2sbus_wait_for_stop(i2sdev, pi);
347 if (!pi->substream || !pi->substream->runtime) {
352 runtime = pi->substream->runtime;
355 ((i2sdev->format != runtime->format)
356 || (i2sdev->rate != runtime->rate))) {
361 i2sdev->format = runtime->format;
362 i2sdev->rate = runtime->rate;
364 periodsize = snd_pcm_lib_period_bytes(pi->substream);
365 nperiods = pi->substream->runtime->periods;
366 pi->current_period = 0;
368 /* generate dbdma command ring first */
369 command = pi->dbdma_ring.cmds;
370 memset(command, 0, (nperiods + 2) * sizeof(struct dbdma_cmd));
372 /* commands to DMA to/from the ring */
374 * For input, we need to do a graceful stop; if we abort
375 * the DMA, we end up with leftover bytes that corrupt
376 * the next recording. To do this we set the S0 status
377 * bit and wait for the DMA controller to stop. Each
378 * command has a branch condition to
379 * make it branch to a stop command if S0 is set.
380 * On input we also need to wait for the S7 bit to be
381 * set before turning off the DMA controller.
382 * In fact we do the graceful stop for output as well.
384 offset = runtime->dma_addr;
385 cmd = (in? INPUT_MORE: OUTPUT_MORE) | BR_IFSET | INTR_ALWAYS;
386 stopaddr = pi->dbdma_ring.bus_cmd_start +
387 (nperiods + 1) * sizeof(struct dbdma_cmd);
388 for (i = 0; i < nperiods; i++, command++, offset += periodsize) {
389 command->command = cpu_to_le16(cmd);
390 command->cmd_dep = cpu_to_le32(stopaddr);
391 command->phy_addr = cpu_to_le32(offset);
392 command->req_count = cpu_to_le16(periodsize);
395 /* branch back to beginning of ring */
396 command->command = cpu_to_le16(DBDMA_NOP | BR_ALWAYS);
397 command->cmd_dep = cpu_to_le32(pi->dbdma_ring.bus_cmd_start);
400 /* set stop command */
401 command->command = cpu_to_le16(DBDMA_STOP);
403 /* ok, let's set the serial format and stuff */
404 switch (runtime->format) {
406 case SNDRV_PCM_FORMAT_S16_BE:
407 case SNDRV_PCM_FORMAT_U16_BE:
408 /* FIXME: if we add different bus factors we need to
411 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
412 bi.bus_factor = cii->codec->bus_factor;
415 if (!bi.bus_factor) {
421 case SNDRV_PCM_FORMAT_S32_BE:
422 case SNDRV_PCM_FORMAT_U32_BE:
423 /* force 64x bus speed, otherwise the data cannot be
424 * transferred quickly enough! */
432 /* we assume all sysclocks are the same! */
433 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
434 bi.sysclock_factor = cii->codec->sysclock_factor;
438 if (clock_and_divisors(bi.sysclock_factor,
445 switch (bi.bus_factor) {
447 sfr |= I2S_SF_SERIAL_FORMAT_I2S_32X;
450 sfr |= I2S_SF_SERIAL_FORMAT_I2S_64X;
453 /* FIXME: THIS ASSUMES MASTER ALL THE TIME */
454 sfr |= I2S_SF_SCLK_MASTER;
456 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
458 if (cii->codec->prepare)
459 err = cii->codec->prepare(cii, &bi, pi->substream);
465 /* codecs are fine with it, so set our clocks */
467 dws = (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
468 (2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
469 I2S_DWS_DATA_IN_16BIT | I2S_DWS_DATA_OUT_16BIT;
471 dws = (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
472 (2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
473 I2S_DWS_DATA_IN_24BIT | I2S_DWS_DATA_OUT_24BIT;
475 /* early exit if already programmed correctly */
476 /* not locking these is fine since we touch them only in this function */
477 if (in_le32(&i2sdev->intfregs->serial_format) == sfr
478 && in_le32(&i2sdev->intfregs->data_word_sizes) == dws)
481 /* let's notify the codecs about clocks going away.
482 * For now we only do mastering on the i2s cell... */
483 list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
484 if (cii->codec->switch_clock)
485 cii->codec->switch_clock(cii, CLOCK_SWITCH_PREPARE_SLAVE);
487 i2sbus_control_enable(i2sdev->control, i2sdev);
488 i2sbus_control_cell(i2sdev->control, i2sdev, 1);
490 out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);
492 i2sbus_control_clock(i2sdev->control, i2sdev, 0);
496 /* wait for clock stopped. This can apparently take a while... */
499 !(in_le32(&i2sdev->intfregs->intr_ctl) & I2S_PENDING_CLOCKS_STOPPED)) {
502 out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);
504 /* not locking these is fine since we touch them only in this function */
505 out_le32(&i2sdev->intfregs->serial_format, sfr);
506 out_le32(&i2sdev->intfregs->data_word_sizes, dws);
508 i2sbus_control_enable(i2sdev->control, i2sdev);
509 i2sbus_control_cell(i2sdev->control, i2sdev, 1);
510 i2sbus_control_clock(i2sdev->control, i2sdev, 1);
513 list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
514 if (cii->codec->switch_clock)
515 cii->codec->switch_clock(cii, CLOCK_SWITCH_SLAVE);
518 mutex_unlock(&i2sdev->lock);
523 void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev)
525 i2sbus_pcm_prepare(i2sdev, 0);
526 i2sbus_pcm_prepare(i2sdev, 1);
530 static int i2sbus_pcm_trigger(struct i2sbus_dev *i2sdev, int in, int cmd)
532 struct codec_info_item *cii;
537 spin_lock_irqsave(&i2sdev->low_lock, flags);
539 get_pcm_info(i2sdev, in, &pi, NULL);
542 case SNDRV_PCM_TRIGGER_START:
543 case SNDRV_PCM_TRIGGER_RESUME:
544 if (pi->dbdma_ring.running) {
548 list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
549 if (cii->codec->start)
550 cii->codec->start(cii, pi->substream);
551 pi->dbdma_ring.running = 1;
553 if (pi->dbdma_ring.stopping) {
554 /* Clear the S0 bit, then see if we stopped yet */
555 out_le32(&pi->dbdma->control, 1 << 16);
556 if (in_le32(&pi->dbdma->status) & ACTIVE) {
557 /* possible race here? */
559 if (in_le32(&pi->dbdma->status) & ACTIVE) {
560 pi->dbdma_ring.stopping = 0;
561 goto out_unlock; /* keep running */
566 /* make sure RUN, PAUSE and S0 bits are cleared */
567 out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
569 /* set branch condition select register */
570 out_le32(&pi->dbdma->br_sel, (1 << 16) | 1);
572 /* write dma command buffer address to the dbdma chip */
573 out_le32(&pi->dbdma->cmdptr, pi->dbdma_ring.bus_cmd_start);
575 /* initialize the frame count and current period */
576 pi->current_period = 0;
577 pi->frame_count = in_le32(&i2sdev->intfregs->frame_count);
579 /* set the DMA controller running */
580 out_le32(&pi->dbdma->control, (RUN << 16) | RUN);
585 case SNDRV_PCM_TRIGGER_STOP:
586 case SNDRV_PCM_TRIGGER_SUSPEND:
587 if (!pi->dbdma_ring.running) {
591 pi->dbdma_ring.running = 0;
593 /* Set the S0 bit to make the DMA branch to the stop cmd */
594 out_le32(&pi->dbdma->control, (1 << 16) | 1);
595 pi->dbdma_ring.stopping = 1;
597 list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
598 if (cii->codec->stop)
599 cii->codec->stop(cii, pi->substream);
607 spin_unlock_irqrestore(&i2sdev->low_lock, flags);
611 static snd_pcm_uframes_t i2sbus_pcm_pointer(struct i2sbus_dev *i2sdev, int in)
616 get_pcm_info(i2sdev, in, &pi, NULL);
618 fc = in_le32(&i2sdev->intfregs->frame_count);
619 fc = fc - pi->frame_count;
621 if (fc >= pi->substream->runtime->buffer_size)
622 fc %= pi->substream->runtime->buffer_size;
626 static inline void handle_interrupt(struct i2sbus_dev *i2sdev, int in)
633 struct snd_pcm_runtime *runtime;
635 spin_lock(&i2sdev->low_lock);
636 get_pcm_info(i2sdev, in, &pi, NULL);
637 if (!pi->dbdma_ring.running && !pi->dbdma_ring.stopping)
640 i = pi->current_period;
641 runtime = pi->substream->runtime;
642 while (pi->dbdma_ring.cmds[i].xfer_status) {
643 if (le16_to_cpu(pi->dbdma_ring.cmds[i].xfer_status) & BT)
645 * BT is the branch taken bit. If it took a branch
646 * it is because we set the S0 bit to make it
647 * branch to the stop command.
650 pi->dbdma_ring.cmds[i].xfer_status = 0;
652 if (++i >= runtime->periods) {
654 pi->frame_count += runtime->buffer_size;
656 pi->current_period = i;
659 * Check the frame count. The DMA tends to get a bit
660 * ahead of the frame counter, which confuses the core.
662 fc = in_le32(&i2sdev->intfregs->frame_count);
663 nframes = i * runtime->period_size;
664 if (fc < pi->frame_count + nframes)
665 pi->frame_count = fc - nframes;
671 status = in_le32(&pi->dbdma->status);
672 if (!(status & ACTIVE) && (!in || (status & 0x80)))
674 if (--timeout <= 0) {
675 printk(KERN_ERR "i2sbus: timed out "
676 "waiting for DMA to stop!\n");
682 /* Turn off DMA controller, clear S0 bit */
683 out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
685 pi->dbdma_ring.stopping = 0;
686 if (pi->stop_completion)
687 complete(pi->stop_completion);
690 if (!pi->dbdma_ring.running)
692 spin_unlock(&i2sdev->low_lock);
693 /* may call _trigger again, hence needs to be unlocked */
694 snd_pcm_period_elapsed(pi->substream);
698 spin_unlock(&i2sdev->low_lock);
701 irqreturn_t i2sbus_tx_intr(int irq, void *devid)
703 handle_interrupt((struct i2sbus_dev *)devid, 0);
707 irqreturn_t i2sbus_rx_intr(int irq, void *devid)
709 handle_interrupt((struct i2sbus_dev *)devid, 1);
713 static int i2sbus_playback_open(struct snd_pcm_substream *substream)
715 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
719 i2sdev->out.substream = substream;
720 return i2sbus_pcm_open(i2sdev, 0);
723 static int i2sbus_playback_close(struct snd_pcm_substream *substream)
725 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
730 if (i2sdev->out.substream != substream)
732 err = i2sbus_pcm_close(i2sdev, 0);
734 i2sdev->out.substream = NULL;
738 static int i2sbus_playback_prepare(struct snd_pcm_substream *substream)
740 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
744 if (i2sdev->out.substream != substream)
746 return i2sbus_pcm_prepare(i2sdev, 0);
749 static int i2sbus_playback_trigger(struct snd_pcm_substream *substream, int cmd)
751 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
755 if (i2sdev->out.substream != substream)
757 return i2sbus_pcm_trigger(i2sdev, 0, cmd);
760 static snd_pcm_uframes_t i2sbus_playback_pointer(struct snd_pcm_substream
763 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
767 if (i2sdev->out.substream != substream)
769 return i2sbus_pcm_pointer(i2sdev, 0);
772 static const struct snd_pcm_ops i2sbus_playback_ops = {
773 .open = i2sbus_playback_open,
774 .close = i2sbus_playback_close,
775 .hw_free = i2sbus_playback_hw_free,
776 .prepare = i2sbus_playback_prepare,
777 .trigger = i2sbus_playback_trigger,
778 .pointer = i2sbus_playback_pointer,
781 static int i2sbus_record_open(struct snd_pcm_substream *substream)
783 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
787 i2sdev->in.substream = substream;
788 return i2sbus_pcm_open(i2sdev, 1);
791 static int i2sbus_record_close(struct snd_pcm_substream *substream)
793 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
798 if (i2sdev->in.substream != substream)
800 err = i2sbus_pcm_close(i2sdev, 1);
802 i2sdev->in.substream = NULL;
806 static int i2sbus_record_prepare(struct snd_pcm_substream *substream)
808 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
812 if (i2sdev->in.substream != substream)
814 return i2sbus_pcm_prepare(i2sdev, 1);
817 static int i2sbus_record_trigger(struct snd_pcm_substream *substream, int cmd)
819 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
823 if (i2sdev->in.substream != substream)
825 return i2sbus_pcm_trigger(i2sdev, 1, cmd);
828 static snd_pcm_uframes_t i2sbus_record_pointer(struct snd_pcm_substream
831 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
835 if (i2sdev->in.substream != substream)
837 return i2sbus_pcm_pointer(i2sdev, 1);
840 static const struct snd_pcm_ops i2sbus_record_ops = {
841 .open = i2sbus_record_open,
842 .close = i2sbus_record_close,
843 .hw_free = i2sbus_record_hw_free,
844 .prepare = i2sbus_record_prepare,
845 .trigger = i2sbus_record_trigger,
846 .pointer = i2sbus_record_pointer,
849 static void i2sbus_private_free(struct snd_pcm *pcm)
851 struct i2sbus_dev *i2sdev = snd_pcm_chip(pcm);
852 struct codec_info_item *p, *tmp;
854 i2sdev->sound.pcm = NULL;
855 i2sdev->out.created = 0;
856 i2sdev->in.created = 0;
857 list_for_each_entry_safe(p, tmp, &i2sdev->sound.codec_list, list) {
858 printk(KERN_ERR "i2sbus: a codec didn't unregister!\n");
860 module_put(p->codec->owner);
863 soundbus_dev_put(&i2sdev->sound);
864 module_put(THIS_MODULE);
868 i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
869 struct codec_info *ci, void *data)
871 int err, in = 0, out = 0;
872 struct transfer_info *tmp;
873 struct i2sbus_dev *i2sdev = soundbus_dev_to_i2sbus_dev(dev);
874 struct codec_info_item *cii;
876 if (!dev->pcmname || dev->pcmid == -1) {
877 printk(KERN_ERR "i2sbus: pcm name and id must be set!\n");
881 list_for_each_entry(cii, &dev->codec_list, list) {
882 if (cii->codec_data == data)
886 if (!ci->transfers || !ci->transfers->formats
887 || !ci->transfers->rates || !ci->usable)
890 /* we currently code the i2s transfer on the clock, and support only
892 if (ci->bus_factor != 32 && ci->bus_factor != 64)
895 /* If you want to fix this, you need to keep track of what transport infos
896 * are to be used, which codecs they belong to, and then fix all the
897 * sysclock/busclock stuff above to depend on which is usable */
898 list_for_each_entry(cii, &dev->codec_list, list) {
899 if (cii->codec->sysclock_factor != ci->sysclock_factor) {
901 "cannot yet handle multiple different sysclocks!\n");
904 if (cii->codec->bus_factor != ci->bus_factor) {
906 "cannot yet handle multiple different bus clocks!\n");
912 while (tmp->formats && tmp->rates) {
913 if (tmp->transfer_in)
920 cii = kzalloc(sizeof(struct codec_info_item), GFP_KERNEL);
924 /* use the private data to point to the codec info */
925 cii->sdev = soundbus_dev_get(dev);
927 cii->codec_data = data;
931 "i2sbus: failed to get soundbus dev reference\n");
936 if (!try_module_get(THIS_MODULE)) {
937 printk(KERN_DEBUG "i2sbus: failed to get module reference!\n");
942 if (!try_module_get(ci->owner)) {
944 "i2sbus: failed to get module reference to codec owner!\n");
946 goto out_put_this_module;
950 err = snd_pcm_new(card, dev->pcmname, dev->pcmid, 0, 0,
953 printk(KERN_DEBUG "i2sbus: failed to create pcm\n");
954 goto out_put_ci_module;
958 /* ALSA yet again sucks.
959 * If it is ever fixed, remove this line. See below. */
962 if (!i2sdev->out.created && out) {
963 if (dev->pcm->card != card) {
966 "Can't attach same bus to different cards!\n");
968 goto out_put_ci_module;
970 err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 1);
972 goto out_put_ci_module;
973 snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
974 &i2sbus_playback_ops);
975 dev->pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].dev->parent =
977 i2sdev->out.created = 1;
980 if (!i2sdev->in.created && in) {
981 if (dev->pcm->card != card) {
983 "Can't attach same bus to different cards!\n");
985 goto out_put_ci_module;
987 err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 1);
989 goto out_put_ci_module;
990 snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
992 dev->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].dev->parent =
994 i2sdev->in.created = 1;
997 /* so we have to register the pcm after adding any substream
998 * to it because alsa doesn't create the devices for the
999 * substreams when we add them later.
1000 * Therefore, force in and out on both busses (above) and
1001 * register the pcm now instead of just after creating it.
1003 err = snd_device_register(card, dev->pcm);
1005 printk(KERN_ERR "i2sbus: error registering new pcm\n");
1006 goto out_put_ci_module;
1008 /* no errors any more, so let's add this to our list */
1009 list_add(&cii->list, &dev->codec_list);
1011 dev->pcm->private_data = i2sdev;
1012 dev->pcm->private_free = i2sbus_private_free;
1014 /* well, we really should support scatter/gather DMA */
1015 snd_pcm_set_managed_buffer_all(
1016 dev->pcm, SNDRV_DMA_TYPE_DEV,
1017 &macio_get_pci_dev(i2sdev->macio)->dev,
1018 64 * 1024, 64 * 1024);
1022 module_put(ci->owner);
1023 out_put_this_module:
1024 module_put(THIS_MODULE);
1026 soundbus_dev_put(dev);
1032 void i2sbus_detach_codec(struct soundbus_dev *dev, void *data)
1034 struct codec_info_item *cii = NULL, *i;
1036 list_for_each_entry(i, &dev->codec_list, list) {
1037 if (i->codec_data == data) {
1043 list_del(&cii->list);
1044 module_put(cii->codec->owner);
1047 /* no more codecs, but still a pcm? */
1048 if (list_empty(&dev->codec_list) && dev->pcm) {
1049 /* the actual cleanup is done by the callback above! */
1050 snd_device_free(dev->pcm->card, dev->pcm);