2
* i2sbus driver -- pcm routines
4
* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
6
* GPL v2, can be found in COPYING.
10
#include <linux/delay.h>
11
#include <linux/slab.h>
12
#include <sound/core.h>
13
#include <asm/macio.h>
14
#include <linux/pci.h>
15
#include <linux/module.h>
16
#include "../soundbus.h"
19
static inline void get_pcm_info(struct i2sbus_dev *i2sdev, int in,
20
struct pcm_info **pi, struct pcm_info **other)
26
*other = &i2sdev->out;
35
static int clock_and_divisors(int mclk, int sclk, int rate, int *out)
37
/* sclk must be derived from mclk! */
40
/* derive sclk register value */
41
if (i2s_sf_sclkdiv(mclk / sclk, out))
44
if (I2S_CLOCK_SPEED_18MHz % (rate * mclk) == 0) {
45
if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_18MHz / (rate * mclk), out)) {
46
*out |= I2S_SF_CLOCK_SOURCE_18MHz;
50
if (I2S_CLOCK_SPEED_45MHz % (rate * mclk) == 0) {
51
if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_45MHz / (rate * mclk), out)) {
52
*out |= I2S_SF_CLOCK_SOURCE_45MHz;
56
if (I2S_CLOCK_SPEED_49MHz % (rate * mclk) == 0) {
57
if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_49MHz / (rate * mclk), out)) {
58
*out |= I2S_SF_CLOCK_SOURCE_49MHz;
65
#define CHECK_RATE(rate) \
66
do { if (rates & SNDRV_PCM_RATE_ ##rate) { \
68
if (clock_and_divisors(sysclock_factor, \
69
bus_factor, rate, &dummy)) \
70
rates &= ~SNDRV_PCM_RATE_ ##rate; \
73
static int i2sbus_pcm_open(struct i2sbus_dev *i2sdev, int in)
75
struct pcm_info *pi, *other;
76
struct soundbus_dev *sdev;
77
int masks_inited = 0, err;
78
struct codec_info_item *cii, *rev;
79
struct snd_pcm_hardware *hw;
81
unsigned int rates = 0;
82
struct transfer_info v;
84
int bus_factor = 0, sysclock_factor = 0;
87
mutex_lock(&i2sdev->lock);
89
get_pcm_info(i2sdev, in, &pi, &other);
91
hw = &pi->substream->runtime->hw;
92
sdev = &i2sdev->sound;
100
/* we now need to assign the hw */
101
list_for_each_entry(cii, &sdev->codec_list, list) {
102
struct transfer_info *ti = cii->codec->transfers;
103
bus_factor = cii->codec->bus_factor;
104
sysclock_factor = cii->codec->sysclock_factor;
105
while (ti->formats && ti->rates) {
107
if (ti->transfer_in == in
108
&& cii->codec->usable(cii, ti, &v)) {
110
formats &= v.formats;
121
if (!masks_inited || !bus_factor || !sysclock_factor) {
125
/* bus dependent stuff */
126
hw->info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
127
SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_RESUME |
128
SNDRV_PCM_INFO_JOINT_DUPLEX;
145
/* well. the codec might want 24 bits only, and we'll
146
* ever only transfer 24 bits, but they are top-aligned!
147
* So for alsa, we claim that we're doing full 32 bit
148
* while in reality we'll ignore the lower 8 bits of
149
* that when doing playback (they're transferred as 0
150
* as far as I know, no codecs we have are 32-bit capable
151
* so I can't really test) and when doing recording we'll
152
* always have those lower 8 bits recorded as 0 */
153
if (formats & SNDRV_PCM_FMTBIT_S24_BE)
154
formats |= SNDRV_PCM_FMTBIT_S32_BE;
155
if (formats & SNDRV_PCM_FMTBIT_U24_BE)
156
formats |= SNDRV_PCM_FMTBIT_U32_BE;
157
/* now mask off what we can support. I suppose we could
158
* also support S24_3LE and some similar formats, but I
159
* doubt there's a codec that would be able to use that,
160
* so we don't support it here. */
161
hw->formats = formats & (SNDRV_PCM_FMTBIT_S16_BE |
162
SNDRV_PCM_FMTBIT_U16_BE |
163
SNDRV_PCM_FMTBIT_S32_BE |
164
SNDRV_PCM_FMTBIT_U32_BE);
166
/* we need to set the highest and lowest rate possible.
167
* These are the highest and lowest rates alsa can
168
* support properly in its bitfield.
169
* Below, we'll use that to restrict to the rate
170
* currently in use (if any). */
172
hw->rate_max = 192000;
173
/* if the other stream is active, then we can only
174
* support what it is currently using.
175
* FIXME: I lied. This comment is wrong. We can support
176
* anything that works with the same serial format, ie.
177
* when recording 24 bit sound we can well play 16 bit
178
* sound at the same time iff using the same transfer mode.
181
/* FIXME: is this guaranteed by the alsa api? */
182
hw->formats &= (1ULL << i2sdev->format);
183
/* see above, restrict rates to the one we already have */
184
hw->rate_min = i2sdev->rate;
185
hw->rate_max = i2sdev->rate;
188
hw->channels_min = 2;
189
hw->channels_max = 2;
190
/* these are somewhat arbitrary */
191
hw->buffer_bytes_max = 131072;
192
hw->period_bytes_min = 256;
193
hw->period_bytes_max = 16384;
195
hw->periods_max = MAX_DBDMA_COMMANDS;
196
err = snd_pcm_hw_constraint_integer(pi->substream->runtime,
197
SNDRV_PCM_HW_PARAM_PERIODS);
202
list_for_each_entry(cii, &sdev->codec_list, list) {
203
if (cii->codec->open) {
204
err = cii->codec->open(cii, pi->substream);
209
list_for_each_entry_reverse(rev,
210
&sdev->codec_list, list) {
211
if (found_this && rev->codec->close) {
212
rev->codec->close(rev,
224
mutex_unlock(&i2sdev->lock);
230
static int i2sbus_pcm_close(struct i2sbus_dev *i2sdev, int in)
232
struct codec_info_item *cii;
236
mutex_lock(&i2sdev->lock);
238
get_pcm_info(i2sdev, in, &pi, NULL);
240
list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
241
if (cii->codec->close) {
242
tmp = cii->codec->close(cii, pi->substream);
248
pi->substream = NULL;
250
mutex_unlock(&i2sdev->lock);
254
static void i2sbus_wait_for_stop(struct i2sbus_dev *i2sdev,
258
struct completion done;
261
spin_lock_irqsave(&i2sdev->low_lock, flags);
262
if (pi->dbdma_ring.stopping) {
263
init_completion(&done);
264
pi->stop_completion = &done;
265
spin_unlock_irqrestore(&i2sdev->low_lock, flags);
266
timeout = wait_for_completion_timeout(&done, HZ);
267
spin_lock_irqsave(&i2sdev->low_lock, flags);
268
pi->stop_completion = NULL;
270
/* timeout expired, stop dbdma forcefully */
271
printk(KERN_ERR "i2sbus_wait_for_stop: timed out\n");
272
/* make sure RUN, PAUSE and S0 bits are cleared */
273
out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
274
pi->dbdma_ring.stopping = 0;
276
while (in_le32(&pi->dbdma->status) & ACTIVE) {
283
spin_unlock_irqrestore(&i2sdev->low_lock, flags);
287
void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev)
291
get_pcm_info(i2sdev, 0, &pi, NULL);
292
i2sbus_wait_for_stop(i2sdev, pi);
293
get_pcm_info(i2sdev, 1, &pi, NULL);
294
i2sbus_wait_for_stop(i2sdev, pi);
298
static int i2sbus_hw_params(struct snd_pcm_substream *substream,
299
struct snd_pcm_hw_params *params)
301
return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
304
static inline int i2sbus_hw_free(struct snd_pcm_substream *substream, int in)
306
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
309
get_pcm_info(i2sdev, in, &pi, NULL);
310
if (pi->dbdma_ring.stopping)
311
i2sbus_wait_for_stop(i2sdev, pi);
312
snd_pcm_lib_free_pages(substream);
316
static int i2sbus_playback_hw_free(struct snd_pcm_substream *substream)
318
return i2sbus_hw_free(substream, 0);
321
static int i2sbus_record_hw_free(struct snd_pcm_substream *substream)
323
return i2sbus_hw_free(substream, 1);
326
static int i2sbus_pcm_prepare(struct i2sbus_dev *i2sdev, int in)
328
/* whee. Hard work now. The user has selected a bitrate
329
* and bit format, so now we have to program our
330
* I2S controller appropriately. */
331
struct snd_pcm_runtime *runtime;
332
struct dbdma_cmd *command;
333
int i, periodsize, nperiods;
336
struct codec_info_item *cii;
337
int sfr = 0; /* serial format register */
338
int dws = 0; /* data word sizes reg */
340
struct pcm_info *pi, *other;
343
unsigned int cmd, stopaddr;
345
mutex_lock(&i2sdev->lock);
347
get_pcm_info(i2sdev, in, &pi, &other);
349
if (pi->dbdma_ring.running) {
353
if (pi->dbdma_ring.stopping)
354
i2sbus_wait_for_stop(i2sdev, pi);
356
if (!pi->substream || !pi->substream->runtime) {
361
runtime = pi->substream->runtime;
364
((i2sdev->format != runtime->format)
365
|| (i2sdev->rate != runtime->rate))) {
370
i2sdev->format = runtime->format;
371
i2sdev->rate = runtime->rate;
373
periodsize = snd_pcm_lib_period_bytes(pi->substream);
374
nperiods = pi->substream->runtime->periods;
375
pi->current_period = 0;
377
/* generate dbdma command ring first */
378
command = pi->dbdma_ring.cmds;
379
memset(command, 0, (nperiods + 2) * sizeof(struct dbdma_cmd));
381
/* commands to DMA to/from the ring */
383
* For input, we need to do a graceful stop; if we abort
384
* the DMA, we end up with leftover bytes that corrupt
385
* the next recording. To do this we set the S0 status
386
* bit and wait for the DMA controller to stop. Each
387
* command has a branch condition to
388
* make it branch to a stop command if S0 is set.
389
* On input we also need to wait for the S7 bit to be
390
* set before turning off the DMA controller.
391
* In fact we do the graceful stop for output as well.
393
offset = runtime->dma_addr;
394
cmd = (in? INPUT_MORE: OUTPUT_MORE) | BR_IFSET | INTR_ALWAYS;
395
stopaddr = pi->dbdma_ring.bus_cmd_start +
396
(nperiods + 1) * sizeof(struct dbdma_cmd);
397
for (i = 0; i < nperiods; i++, command++, offset += periodsize) {
398
command->command = cpu_to_le16(cmd);
399
command->cmd_dep = cpu_to_le32(stopaddr);
400
command->phy_addr = cpu_to_le32(offset);
401
command->req_count = cpu_to_le16(periodsize);
404
/* branch back to beginning of ring */
405
command->command = cpu_to_le16(DBDMA_NOP | BR_ALWAYS);
406
command->cmd_dep = cpu_to_le32(pi->dbdma_ring.bus_cmd_start);
409
/* set stop command */
410
command->command = cpu_to_le16(DBDMA_STOP);
412
/* ok, let's set the serial format and stuff */
413
switch (runtime->format) {
415
case SNDRV_PCM_FORMAT_S16_BE:
416
case SNDRV_PCM_FORMAT_U16_BE:
417
/* FIXME: if we add different bus factors we need to
420
list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
421
bi.bus_factor = cii->codec->bus_factor;
424
if (!bi.bus_factor) {
430
case SNDRV_PCM_FORMAT_S32_BE:
431
case SNDRV_PCM_FORMAT_U32_BE:
432
/* force 64x bus speed, otherwise the data cannot be
433
* transferred quickly enough! */
441
/* we assume all sysclocks are the same! */
442
list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
443
bi.sysclock_factor = cii->codec->sysclock_factor;
447
if (clock_and_divisors(bi.sysclock_factor,
454
switch (bi.bus_factor) {
456
sfr |= I2S_SF_SERIAL_FORMAT_I2S_32X;
459
sfr |= I2S_SF_SERIAL_FORMAT_I2S_64X;
462
/* FIXME: THIS ASSUMES MASTER ALL THE TIME */
463
sfr |= I2S_SF_SCLK_MASTER;
465
list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
467
if (cii->codec->prepare)
468
err = cii->codec->prepare(cii, &bi, pi->substream);
474
/* codecs are fine with it, so set our clocks */
476
dws = (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
477
(2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
478
I2S_DWS_DATA_IN_16BIT | I2S_DWS_DATA_OUT_16BIT;
480
dws = (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
481
(2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
482
I2S_DWS_DATA_IN_24BIT | I2S_DWS_DATA_OUT_24BIT;
484
/* early exit if already programmed correctly */
485
/* not locking these is fine since we touch them only in this function */
486
if (in_le32(&i2sdev->intfregs->serial_format) == sfr
487
&& in_le32(&i2sdev->intfregs->data_word_sizes) == dws)
490
/* let's notify the codecs about clocks going away.
491
* For now we only do mastering on the i2s cell... */
492
list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
493
if (cii->codec->switch_clock)
494
cii->codec->switch_clock(cii, CLOCK_SWITCH_PREPARE_SLAVE);
496
i2sbus_control_enable(i2sdev->control, i2sdev);
497
i2sbus_control_cell(i2sdev->control, i2sdev, 1);
499
out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);
501
i2sbus_control_clock(i2sdev->control, i2sdev, 0);
505
/* wait for clock stopped. This can apparently take a while... */
508
!(in_le32(&i2sdev->intfregs->intr_ctl) & I2S_PENDING_CLOCKS_STOPPED)) {
511
out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);
513
/* not locking these is fine since we touch them only in this function */
514
out_le32(&i2sdev->intfregs->serial_format, sfr);
515
out_le32(&i2sdev->intfregs->data_word_sizes, dws);
517
i2sbus_control_enable(i2sdev->control, i2sdev);
518
i2sbus_control_cell(i2sdev->control, i2sdev, 1);
519
i2sbus_control_clock(i2sdev->control, i2sdev, 1);
522
list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
523
if (cii->codec->switch_clock)
524
cii->codec->switch_clock(cii, CLOCK_SWITCH_SLAVE);
527
mutex_unlock(&i2sdev->lock);
532
void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev)
534
i2sbus_pcm_prepare(i2sdev, 0);
535
i2sbus_pcm_prepare(i2sdev, 1);
539
static int i2sbus_pcm_trigger(struct i2sbus_dev *i2sdev, int in, int cmd)
541
struct codec_info_item *cii;
546
spin_lock_irqsave(&i2sdev->low_lock, flags);
548
get_pcm_info(i2sdev, in, &pi, NULL);
551
case SNDRV_PCM_TRIGGER_START:
552
case SNDRV_PCM_TRIGGER_RESUME:
553
if (pi->dbdma_ring.running) {
557
list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
558
if (cii->codec->start)
559
cii->codec->start(cii, pi->substream);
560
pi->dbdma_ring.running = 1;
562
if (pi->dbdma_ring.stopping) {
563
/* Clear the S0 bit, then see if we stopped yet */
564
out_le32(&pi->dbdma->control, 1 << 16);
565
if (in_le32(&pi->dbdma->status) & ACTIVE) {
566
/* possible race here? */
568
if (in_le32(&pi->dbdma->status) & ACTIVE) {
569
pi->dbdma_ring.stopping = 0;
570
goto out_unlock; /* keep running */
575
/* make sure RUN, PAUSE and S0 bits are cleared */
576
out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
578
/* set branch condition select register */
579
out_le32(&pi->dbdma->br_sel, (1 << 16) | 1);
581
/* write dma command buffer address to the dbdma chip */
582
out_le32(&pi->dbdma->cmdptr, pi->dbdma_ring.bus_cmd_start);
584
/* initialize the frame count and current period */
585
pi->current_period = 0;
586
pi->frame_count = in_le32(&i2sdev->intfregs->frame_count);
588
/* set the DMA controller running */
589
out_le32(&pi->dbdma->control, (RUN << 16) | RUN);
594
case SNDRV_PCM_TRIGGER_STOP:
595
case SNDRV_PCM_TRIGGER_SUSPEND:
596
if (!pi->dbdma_ring.running) {
600
pi->dbdma_ring.running = 0;
602
/* Set the S0 bit to make the DMA branch to the stop cmd */
603
out_le32(&pi->dbdma->control, (1 << 16) | 1);
604
pi->dbdma_ring.stopping = 1;
606
list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
607
if (cii->codec->stop)
608
cii->codec->stop(cii, pi->substream);
616
spin_unlock_irqrestore(&i2sdev->low_lock, flags);
620
static snd_pcm_uframes_t i2sbus_pcm_pointer(struct i2sbus_dev *i2sdev, int in)
625
get_pcm_info(i2sdev, in, &pi, NULL);
627
fc = in_le32(&i2sdev->intfregs->frame_count);
628
fc = fc - pi->frame_count;
630
if (fc >= pi->substream->runtime->buffer_size)
631
fc %= pi->substream->runtime->buffer_size;
635
static inline void handle_interrupt(struct i2sbus_dev *i2sdev, int in)
642
struct snd_pcm_runtime *runtime;
644
spin_lock(&i2sdev->low_lock);
645
get_pcm_info(i2sdev, in, &pi, NULL);
646
if (!pi->dbdma_ring.running && !pi->dbdma_ring.stopping)
649
i = pi->current_period;
650
runtime = pi->substream->runtime;
651
while (pi->dbdma_ring.cmds[i].xfer_status) {
652
if (le16_to_cpu(pi->dbdma_ring.cmds[i].xfer_status) & BT)
654
* BT is the branch taken bit. If it took a branch
655
* it is because we set the S0 bit to make it
656
* branch to the stop command.
659
pi->dbdma_ring.cmds[i].xfer_status = 0;
661
if (++i >= runtime->periods) {
663
pi->frame_count += runtime->buffer_size;
665
pi->current_period = i;
668
* Check the frame count. The DMA tends to get a bit
669
* ahead of the frame counter, which confuses the core.
671
fc = in_le32(&i2sdev->intfregs->frame_count);
672
nframes = i * runtime->period_size;
673
if (fc < pi->frame_count + nframes)
674
pi->frame_count = fc - nframes;
680
status = in_le32(&pi->dbdma->status);
681
if (!(status & ACTIVE) && (!in || (status & 0x80)))
683
if (--timeout <= 0) {
684
printk(KERN_ERR "i2sbus: timed out "
685
"waiting for DMA to stop!\n");
691
/* Turn off DMA controller, clear S0 bit */
692
out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
694
pi->dbdma_ring.stopping = 0;
695
if (pi->stop_completion)
696
complete(pi->stop_completion);
699
if (!pi->dbdma_ring.running)
701
spin_unlock(&i2sdev->low_lock);
702
/* may call _trigger again, hence needs to be unlocked */
703
snd_pcm_period_elapsed(pi->substream);
707
spin_unlock(&i2sdev->low_lock);
710
irqreturn_t i2sbus_tx_intr(int irq, void *devid)
712
handle_interrupt((struct i2sbus_dev *)devid, 0);
716
irqreturn_t i2sbus_rx_intr(int irq, void *devid)
718
handle_interrupt((struct i2sbus_dev *)devid, 1);
722
static int i2sbus_playback_open(struct snd_pcm_substream *substream)
724
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
728
i2sdev->out.substream = substream;
729
return i2sbus_pcm_open(i2sdev, 0);
732
static int i2sbus_playback_close(struct snd_pcm_substream *substream)
734
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
739
if (i2sdev->out.substream != substream)
741
err = i2sbus_pcm_close(i2sdev, 0);
743
i2sdev->out.substream = NULL;
747
static int i2sbus_playback_prepare(struct snd_pcm_substream *substream)
749
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
753
if (i2sdev->out.substream != substream)
755
return i2sbus_pcm_prepare(i2sdev, 0);
758
static int i2sbus_playback_trigger(struct snd_pcm_substream *substream, int cmd)
760
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
764
if (i2sdev->out.substream != substream)
766
return i2sbus_pcm_trigger(i2sdev, 0, cmd);
769
static snd_pcm_uframes_t i2sbus_playback_pointer(struct snd_pcm_substream
772
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
776
if (i2sdev->out.substream != substream)
778
return i2sbus_pcm_pointer(i2sdev, 0);
781
static struct snd_pcm_ops i2sbus_playback_ops = {
782
.open = i2sbus_playback_open,
783
.close = i2sbus_playback_close,
784
.ioctl = snd_pcm_lib_ioctl,
785
.hw_params = i2sbus_hw_params,
786
.hw_free = i2sbus_playback_hw_free,
787
.prepare = i2sbus_playback_prepare,
788
.trigger = i2sbus_playback_trigger,
789
.pointer = i2sbus_playback_pointer,
792
static int i2sbus_record_open(struct snd_pcm_substream *substream)
794
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
798
i2sdev->in.substream = substream;
799
return i2sbus_pcm_open(i2sdev, 1);
802
static int i2sbus_record_close(struct snd_pcm_substream *substream)
804
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
809
if (i2sdev->in.substream != substream)
811
err = i2sbus_pcm_close(i2sdev, 1);
813
i2sdev->in.substream = NULL;
817
static int i2sbus_record_prepare(struct snd_pcm_substream *substream)
819
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
823
if (i2sdev->in.substream != substream)
825
return i2sbus_pcm_prepare(i2sdev, 1);
828
static int i2sbus_record_trigger(struct snd_pcm_substream *substream, int cmd)
830
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
834
if (i2sdev->in.substream != substream)
836
return i2sbus_pcm_trigger(i2sdev, 1, cmd);
839
static snd_pcm_uframes_t i2sbus_record_pointer(struct snd_pcm_substream
842
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
846
if (i2sdev->in.substream != substream)
848
return i2sbus_pcm_pointer(i2sdev, 1);
851
static struct snd_pcm_ops i2sbus_record_ops = {
852
.open = i2sbus_record_open,
853
.close = i2sbus_record_close,
854
.ioctl = snd_pcm_lib_ioctl,
855
.hw_params = i2sbus_hw_params,
856
.hw_free = i2sbus_record_hw_free,
857
.prepare = i2sbus_record_prepare,
858
.trigger = i2sbus_record_trigger,
859
.pointer = i2sbus_record_pointer,
862
static void i2sbus_private_free(struct snd_pcm *pcm)
864
struct i2sbus_dev *i2sdev = snd_pcm_chip(pcm);
865
struct codec_info_item *p, *tmp;
867
i2sdev->sound.pcm = NULL;
868
i2sdev->out.created = 0;
869
i2sdev->in.created = 0;
870
list_for_each_entry_safe(p, tmp, &i2sdev->sound.codec_list, list) {
871
printk(KERN_ERR "i2sbus: a codec didn't unregister!\n");
873
module_put(p->codec->owner);
876
soundbus_dev_put(&i2sdev->sound);
877
module_put(THIS_MODULE);
881
i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
882
struct codec_info *ci, void *data)
884
int err, in = 0, out = 0;
885
struct transfer_info *tmp;
886
struct i2sbus_dev *i2sdev = soundbus_dev_to_i2sbus_dev(dev);
887
struct codec_info_item *cii;
889
if (!dev->pcmname || dev->pcmid == -1) {
890
printk(KERN_ERR "i2sbus: pcm name and id must be set!\n");
894
list_for_each_entry(cii, &dev->codec_list, list) {
895
if (cii->codec_data == data)
899
if (!ci->transfers || !ci->transfers->formats
900
|| !ci->transfers->rates || !ci->usable)
903
/* we currently code the i2s transfer on the clock, and support only
905
if (ci->bus_factor != 32 && ci->bus_factor != 64)
908
/* If you want to fix this, you need to keep track of what transport infos
909
* are to be used, which codecs they belong to, and then fix all the
910
* sysclock/busclock stuff above to depend on which is usable */
911
list_for_each_entry(cii, &dev->codec_list, list) {
912
if (cii->codec->sysclock_factor != ci->sysclock_factor) {
914
"cannot yet handle multiple different sysclocks!\n");
917
if (cii->codec->bus_factor != ci->bus_factor) {
919
"cannot yet handle multiple different bus clocks!\n");
925
while (tmp->formats && tmp->rates) {
926
if (tmp->transfer_in)
933
cii = kzalloc(sizeof(struct codec_info_item), GFP_KERNEL);
935
printk(KERN_DEBUG "i2sbus: failed to allocate cii\n");
939
/* use the private data to point to the codec info */
940
cii->sdev = soundbus_dev_get(dev);
942
cii->codec_data = data;
946
"i2sbus: failed to get soundbus dev reference\n");
951
if (!try_module_get(THIS_MODULE)) {
952
printk(KERN_DEBUG "i2sbus: failed to get module reference!\n");
957
if (!try_module_get(ci->owner)) {
959
"i2sbus: failed to get module reference to codec owner!\n");
961
goto out_put_this_module;
965
err = snd_pcm_new(card, dev->pcmname, dev->pcmid, 0, 0,
968
printk(KERN_DEBUG "i2sbus: failed to create pcm\n");
969
goto out_put_ci_module;
971
dev->pcm->dev = &dev->ofdev.dev;
974
/* ALSA yet again sucks.
975
* If it is ever fixed, remove this line. See below. */
978
if (!i2sdev->out.created && out) {
979
if (dev->pcm->card != card) {
982
"Can't attach same bus to different cards!\n");
984
goto out_put_ci_module;
986
err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 1);
988
goto out_put_ci_module;
989
snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
990
&i2sbus_playback_ops);
991
i2sdev->out.created = 1;
994
if (!i2sdev->in.created && in) {
995
if (dev->pcm->card != card) {
997
"Can't attach same bus to different cards!\n");
999
goto out_put_ci_module;
1001
err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 1);
1003
goto out_put_ci_module;
1004
snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
1005
&i2sbus_record_ops);
1006
i2sdev->in.created = 1;
1009
/* so we have to register the pcm after adding any substream
1010
* to it because alsa doesn't create the devices for the
1011
* substreams when we add them later.
1012
* Therefore, force in and out on both busses (above) and
1013
* register the pcm now instead of just after creating it.
1015
err = snd_device_register(card, dev->pcm);
1017
printk(KERN_ERR "i2sbus: error registering new pcm\n");
1018
goto out_put_ci_module;
1020
/* no errors any more, so let's add this to our list */
1021
list_add(&cii->list, &dev->codec_list);
1023
dev->pcm->private_data = i2sdev;
1024
dev->pcm->private_free = i2sbus_private_free;
1026
/* well, we really should support scatter/gather DMA */
1027
snd_pcm_lib_preallocate_pages_for_all(
1028
dev->pcm, SNDRV_DMA_TYPE_DEV,
1029
snd_dma_pci_data(macio_get_pci_dev(i2sdev->macio)),
1030
64 * 1024, 64 * 1024);
1034
module_put(ci->owner);
1035
out_put_this_module:
1036
module_put(THIS_MODULE);
1038
soundbus_dev_put(dev);
1044
void i2sbus_detach_codec(struct soundbus_dev *dev, void *data)
1046
struct codec_info_item *cii = NULL, *i;
1048
list_for_each_entry(i, &dev->codec_list, list) {
1049
if (i->codec_data == data) {
1055
list_del(&cii->list);
1056
module_put(cii->codec->owner);
1059
/* no more codecs, but still a pcm? */
1060
if (list_empty(&dev->codec_list) && dev->pcm) {
1061
/* the actual cleanup is done by the callback above! */
1062
snd_device_free(dev->pcm->card, dev->pcm);