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DEFINITIONS
This source file includes following definitions.
- get_pcm_info
- clock_and_divisors
- i2sbus_pcm_open
- i2sbus_pcm_close
- i2sbus_wait_for_stop
- i2sbus_wait_for_stop_both
- i2sbus_hw_params
- i2sbus_hw_free
- i2sbus_playback_hw_free
- i2sbus_record_hw_free
- i2sbus_pcm_prepare
- i2sbus_pcm_prepare_both
- i2sbus_pcm_trigger
- i2sbus_pcm_pointer
- handle_interrupt
- i2sbus_tx_intr
- i2sbus_rx_intr
- i2sbus_playback_open
- i2sbus_playback_close
- i2sbus_playback_prepare
- i2sbus_playback_trigger
- i2sbus_playback_pointer
- i2sbus_record_open
- i2sbus_record_close
- i2sbus_record_prepare
- i2sbus_record_trigger
- i2sbus_record_pointer
- i2sbus_private_free
- i2sbus_attach_codec
- i2sbus_detach_codec
/*
* i2sbus driver -- pcm routines
*
* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
*
* GPL v2, can be found in COPYING.
*/
#include <asm/io.h>
#include <linux/delay.h>
#include <sound/core.h>
#include <asm/macio.h>
#include <linux/pci.h>
#include "../soundbus.h"
#include "i2sbus.h"
static inline void get_pcm_info(struct i2sbus_dev *i2sdev, int in,
struct pcm_info **pi, struct pcm_info **other)
{
if (in) {
if (pi)
*pi = &i2sdev->in;
if (other)
*other = &i2sdev->out;
} else {
if (pi)
*pi = &i2sdev->out;
if (other)
*other = &i2sdev->in;
}
}
static int clock_and_divisors(int mclk, int sclk, int rate, int *out)
{
/* sclk must be derived from mclk! */
if (mclk % sclk)
return -1;
/* derive sclk register value */
if (i2s_sf_sclkdiv(mclk / sclk, out))
return -1;
if (I2S_CLOCK_SPEED_18MHz % (rate * mclk) == 0) {
if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_18MHz / (rate * mclk), out)) {
*out |= I2S_SF_CLOCK_SOURCE_18MHz;
return 0;
}
}
if (I2S_CLOCK_SPEED_45MHz % (rate * mclk) == 0) {
if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_45MHz / (rate * mclk), out)) {
*out |= I2S_SF_CLOCK_SOURCE_45MHz;
return 0;
}
}
if (I2S_CLOCK_SPEED_49MHz % (rate * mclk) == 0) {
if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_49MHz / (rate * mclk), out)) {
*out |= I2S_SF_CLOCK_SOURCE_49MHz;
return 0;
}
}
return -1;
}
#define CHECK_RATE(rate) \
do { if (rates & SNDRV_PCM_RATE_ ##rate) { \
int dummy; \
if (clock_and_divisors(sysclock_factor, \
bus_factor, rate, &dummy)) \
rates &= ~SNDRV_PCM_RATE_ ##rate; \
} } while (0)
static int i2sbus_pcm_open(struct i2sbus_dev *i2sdev, int in)
{
struct pcm_info *pi, *other;
struct soundbus_dev *sdev;
int masks_inited = 0, err;
struct codec_info_item *cii, *rev;
struct snd_pcm_hardware *hw;
u64 formats = 0;
unsigned int rates = 0;
struct transfer_info v;
int result = 0;
int bus_factor = 0, sysclock_factor = 0;
int found_this;
mutex_lock(&i2sdev->lock);
get_pcm_info(i2sdev, in, &pi, &other);
hw = &pi->substream->runtime->hw;
sdev = &i2sdev->sound;
if (pi->active) {
/* alsa messed up */
result = -EBUSY;
goto out_unlock;
}
/* we now need to assign the hw */
list_for_each_entry(cii, &sdev->codec_list, list) {
struct transfer_info *ti = cii->codec->transfers;
bus_factor = cii->codec->bus_factor;
sysclock_factor = cii->codec->sysclock_factor;
while (ti->formats && ti->rates) {
v = *ti;
if (ti->transfer_in == in
&& cii->codec->usable(cii, ti, &v)) {
if (masks_inited) {
formats &= v.formats;
rates &= v.rates;
} else {
formats = v.formats;
rates = v.rates;
masks_inited = 1;
}
}
ti++;
}
}
if (!masks_inited || !bus_factor || !sysclock_factor) {
result = -ENODEV;
goto out_unlock;
}
/* bus dependent stuff */
hw->info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_RESUME |
SNDRV_PCM_INFO_JOINT_DUPLEX;
CHECK_RATE(5512);
CHECK_RATE(8000);
CHECK_RATE(11025);
CHECK_RATE(16000);
CHECK_RATE(22050);
CHECK_RATE(32000);
CHECK_RATE(44100);
CHECK_RATE(48000);
CHECK_RATE(64000);
CHECK_RATE(88200);
CHECK_RATE(96000);
CHECK_RATE(176400);
CHECK_RATE(192000);
hw->rates = rates;
/* well. the codec might want 24 bits only, and we'll
* ever only transfer 24 bits, but they are top-aligned!
* So for alsa, we claim that we're doing full 32 bit
* while in reality we'll ignore the lower 8 bits of
* that when doing playback (they're transferred as 0
* as far as I know, no codecs we have are 32-bit capable
* so I can't really test) and when doing recording we'll
* always have those lower 8 bits recorded as 0 */
if (formats & SNDRV_PCM_FMTBIT_S24_BE)
formats |= SNDRV_PCM_FMTBIT_S32_BE;
if (formats & SNDRV_PCM_FMTBIT_U24_BE)
formats |= SNDRV_PCM_FMTBIT_U32_BE;
/* now mask off what we can support. I suppose we could
* also support S24_3LE and some similar formats, but I
* doubt there's a codec that would be able to use that,
* so we don't support it here. */
hw->formats = formats & (SNDRV_PCM_FMTBIT_S16_BE |
SNDRV_PCM_FMTBIT_U16_BE |
SNDRV_PCM_FMTBIT_S32_BE |
SNDRV_PCM_FMTBIT_U32_BE);
/* we need to set the highest and lowest rate possible.
* These are the highest and lowest rates alsa can
* support properly in its bitfield.
* Below, we'll use that to restrict to the rate
* currently in use (if any). */
hw->rate_min = 5512;
hw->rate_max = 192000;
/* if the other stream is active, then we can only
* support what it is currently using.
* FIXME: I lied. This comment is wrong. We can support
* anything that works with the same serial format, ie.
* when recording 24 bit sound we can well play 16 bit
* sound at the same time iff using the same transfer mode.
*/
if (other->active) {
/* FIXME: is this guaranteed by the alsa api? */
hw->formats &= (1ULL << i2sdev->format);
/* see above, restrict rates to the one we already have */
hw->rate_min = i2sdev->rate;
hw->rate_max = i2sdev->rate;
}
hw->channels_min = 2;
hw->channels_max = 2;
/* these are somewhat arbitrary */
hw->buffer_bytes_max = 131072;
hw->period_bytes_min = 256;
hw->period_bytes_max = 16384;
hw->periods_min = 3;
hw->periods_max = MAX_DBDMA_COMMANDS;
err = snd_pcm_hw_constraint_integer(pi->substream->runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
if (err < 0) {
result = err;
goto out_unlock;
}
list_for_each_entry(cii, &sdev->codec_list, list) {
if (cii->codec->open) {
err = cii->codec->open(cii, pi->substream);
if (err) {
result = err;
/* unwind */
found_this = 0;
list_for_each_entry_reverse(rev,
&sdev->codec_list, list) {
if (found_this && rev->codec->close) {
rev->codec->close(rev,
pi->substream);
}
if (rev == cii)
found_this = 1;
}
goto out_unlock;
}
}
}
out_unlock:
mutex_unlock(&i2sdev->lock);
return result;
}
#undef CHECK_RATE
static int i2sbus_pcm_close(struct i2sbus_dev *i2sdev, int in)
{
struct codec_info_item *cii;
struct pcm_info *pi;
int err = 0, tmp;
mutex_lock(&i2sdev->lock);
get_pcm_info(i2sdev, in, &pi, NULL);
list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
if (cii->codec->close) {
tmp = cii->codec->close(cii, pi->substream);
if (tmp)
err = tmp;
}
}
pi->substream = NULL;
pi->active = 0;
mutex_unlock(&i2sdev->lock);
return err;
}
static void i2sbus_wait_for_stop(struct i2sbus_dev *i2sdev,
struct pcm_info *pi)
{
unsigned long flags;
struct completion done;
long timeout;
spin_lock_irqsave(&i2sdev->low_lock, flags);
if (pi->dbdma_ring.stopping) {
init_completion(&done);
pi->stop_completion = &done;
spin_unlock_irqrestore(&i2sdev->low_lock, flags);
timeout = wait_for_completion_timeout(&done, HZ);
spin_lock_irqsave(&i2sdev->low_lock, flags);
pi->stop_completion = NULL;
if (timeout == 0) {
/* timeout expired, stop dbdma forcefully */
printk(KERN_ERR "i2sbus_wait_for_stop: timed out\n");
/* make sure RUN, PAUSE and S0 bits are cleared */
out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
pi->dbdma_ring.stopping = 0;
timeout = 10;
while (in_le32(&pi->dbdma->status) & ACTIVE) {
if (--timeout <= 0)
break;
udelay(1);
}
}
}
spin_unlock_irqrestore(&i2sdev->low_lock, flags);
}
#ifdef CONFIG_PM
void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev)
{
struct pcm_info *pi;
get_pcm_info(i2sdev, 0, &pi, NULL);
i2sbus_wait_for_stop(i2sdev, pi);
get_pcm_info(i2sdev, 1, &pi, NULL);
i2sbus_wait_for_stop(i2sdev, pi);
}
#endif
static int i2sbus_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
}
static inline int i2sbus_hw_free(struct snd_pcm_substream *substream, int in)
{
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
struct pcm_info *pi;
get_pcm_info(i2sdev, in, &pi, NULL);
if (pi->dbdma_ring.stopping)
i2sbus_wait_for_stop(i2sdev, pi);
snd_pcm_lib_free_pages(substream);
return 0;
}
static int i2sbus_playback_hw_free(struct snd_pcm_substream *substream)
{
return i2sbus_hw_free(substream, 0);
}
static int i2sbus_record_hw_free(struct snd_pcm_substream *substream)
{
return i2sbus_hw_free(substream, 1);
}
static int i2sbus_pcm_prepare(struct i2sbus_dev *i2sdev, int in)
{
/* whee. Hard work now. The user has selected a bitrate
* and bit format, so now we have to program our
* I2S controller appropriately. */
struct snd_pcm_runtime *runtime;
struct dbdma_cmd *command;
int i, periodsize, nperiods;
dma_addr_t offset;
struct bus_info bi;
struct codec_info_item *cii;
int sfr = 0; /* serial format register */
int dws = 0; /* data word sizes reg */
int input_16bit;
struct pcm_info *pi, *other;
int cnt;
int result = 0;
unsigned int cmd, stopaddr;
mutex_lock(&i2sdev->lock);
get_pcm_info(i2sdev, in, &pi, &other);
if (pi->dbdma_ring.running) {
result = -EBUSY;
goto out_unlock;
}
if (pi->dbdma_ring.stopping)
i2sbus_wait_for_stop(i2sdev, pi);
if (!pi->substream || !pi->substream->runtime) {
result = -EINVAL;
goto out_unlock;
}
runtime = pi->substream->runtime;
pi->active = 1;
if (other->active &&
((i2sdev->format != runtime->format)
|| (i2sdev->rate != runtime->rate))) {
result = -EINVAL;
goto out_unlock;
}
i2sdev->format = runtime->format;
i2sdev->rate = runtime->rate;
periodsize = snd_pcm_lib_period_bytes(pi->substream);
nperiods = pi->substream->runtime->periods;
pi->current_period = 0;
/* generate dbdma command ring first */
command = pi->dbdma_ring.cmds;
memset(command, 0, (nperiods + 2) * sizeof(struct dbdma_cmd));
/* commands to DMA to/from the ring */
/*
* For input, we need to do a graceful stop; if we abort
* the DMA, we end up with leftover bytes that corrupt
* the next recording. To do this we set the S0 status
* bit and wait for the DMA controller to stop. Each
* command has a branch condition to
* make it branch to a stop command if S0 is set.
* On input we also need to wait for the S7 bit to be
* set before turning off the DMA controller.
* In fact we do the graceful stop for output as well.
*/
offset = runtime->dma_addr;
cmd = (in? INPUT_MORE: OUTPUT_MORE) | BR_IFSET | INTR_ALWAYS;
stopaddr = pi->dbdma_ring.bus_cmd_start +
(nperiods + 1) * sizeof(struct dbdma_cmd);
for (i = 0; i < nperiods; i++, command++, offset += periodsize) {
command->command = cpu_to_le16(cmd);
command->cmd_dep = cpu_to_le32(stopaddr);
command->phy_addr = cpu_to_le32(offset);
command->req_count = cpu_to_le16(periodsize);
}
/* branch back to beginning of ring */
command->command = cpu_to_le16(DBDMA_NOP | BR_ALWAYS);
command->cmd_dep = cpu_to_le32(pi->dbdma_ring.bus_cmd_start);
command++;
/* set stop command */
command->command = cpu_to_le16(DBDMA_STOP);
/* ok, let's set the serial format and stuff */
switch (runtime->format) {
/* 16 bit formats */
case SNDRV_PCM_FORMAT_S16_BE:
case SNDRV_PCM_FORMAT_U16_BE:
/* FIXME: if we add different bus factors we need to
* do more here!! */
bi.bus_factor = 0;
list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
bi.bus_factor = cii->codec->bus_factor;
break;
}
if (!bi.bus_factor) {
result = -ENODEV;
goto out_unlock;
}
input_16bit = 1;
break;
case SNDRV_PCM_FORMAT_S32_BE:
case SNDRV_PCM_FORMAT_U32_BE:
/* force 64x bus speed, otherwise the data cannot be
* transferred quickly enough! */
bi.bus_factor = 64;
input_16bit = 0;
break;
default:
result = -EINVAL;
goto out_unlock;
}
/* we assume all sysclocks are the same! */
list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
bi.sysclock_factor = cii->codec->sysclock_factor;
break;
}
if (clock_and_divisors(bi.sysclock_factor,
bi.bus_factor,
runtime->rate,
&sfr) < 0) {
result = -EINVAL;
goto out_unlock;
}
switch (bi.bus_factor) {
case 32:
sfr |= I2S_SF_SERIAL_FORMAT_I2S_32X;
break;
case 64:
sfr |= I2S_SF_SERIAL_FORMAT_I2S_64X;
break;
}
/* FIXME: THIS ASSUMES MASTER ALL THE TIME */
sfr |= I2S_SF_SCLK_MASTER;
list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
int err = 0;
if (cii->codec->prepare)
err = cii->codec->prepare(cii, &bi, pi->substream);
if (err) {
result = err;
goto out_unlock;
}
}
/* codecs are fine with it, so set our clocks */
if (input_16bit)
dws = (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
(2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
I2S_DWS_DATA_IN_16BIT | I2S_DWS_DATA_OUT_16BIT;
else
dws = (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
(2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
I2S_DWS_DATA_IN_24BIT | I2S_DWS_DATA_OUT_24BIT;
/* early exit if already programmed correctly */
/* not locking these is fine since we touch them only in this function */
if (in_le32(&i2sdev->intfregs->serial_format) == sfr
&& in_le32(&i2sdev->intfregs->data_word_sizes) == dws)
goto out_unlock;
/* let's notify the codecs about clocks going away.
* For now we only do mastering on the i2s cell... */
list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
if (cii->codec->switch_clock)
cii->codec->switch_clock(cii, CLOCK_SWITCH_PREPARE_SLAVE);
i2sbus_control_enable(i2sdev->control, i2sdev);
i2sbus_control_cell(i2sdev->control, i2sdev, 1);
out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);
i2sbus_control_clock(i2sdev->control, i2sdev, 0);
msleep(1);
/* wait for clock stopped. This can apparently take a while... */
cnt = 100;
while (cnt-- &&
!(in_le32(&i2sdev->intfregs->intr_ctl) & I2S_PENDING_CLOCKS_STOPPED)) {
msleep(5);
}
out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);
/* not locking these is fine since we touch them only in this function */
out_le32(&i2sdev->intfregs->serial_format, sfr);
out_le32(&i2sdev->intfregs->data_word_sizes, dws);
i2sbus_control_enable(i2sdev->control, i2sdev);
i2sbus_control_cell(i2sdev->control, i2sdev, 1);
i2sbus_control_clock(i2sdev->control, i2sdev, 1);
msleep(1);
list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
if (cii->codec->switch_clock)
cii->codec->switch_clock(cii, CLOCK_SWITCH_SLAVE);
out_unlock:
mutex_unlock(&i2sdev->lock);
return result;
}
#ifdef CONFIG_PM
void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev)
{
i2sbus_pcm_prepare(i2sdev, 0);
i2sbus_pcm_prepare(i2sdev, 1);
}
#endif
static int i2sbus_pcm_trigger(struct i2sbus_dev *i2sdev, int in, int cmd)
{
struct codec_info_item *cii;
struct pcm_info *pi;
int result = 0;
unsigned long flags;
spin_lock_irqsave(&i2sdev->low_lock, flags);
get_pcm_info(i2sdev, in, &pi, NULL);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
if (pi->dbdma_ring.running) {
result = -EALREADY;
goto out_unlock;
}
list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
if (cii->codec->start)
cii->codec->start(cii, pi->substream);
pi->dbdma_ring.running = 1;
if (pi->dbdma_ring.stopping) {
/* Clear the S0 bit, then see if we stopped yet */
out_le32(&pi->dbdma->control, 1 << 16);
if (in_le32(&pi->dbdma->status) & ACTIVE) {
/* possible race here? */
udelay(10);
if (in_le32(&pi->dbdma->status) & ACTIVE) {
pi->dbdma_ring.stopping = 0;
goto out_unlock; /* keep running */
}
}
}
/* make sure RUN, PAUSE and S0 bits are cleared */
out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
/* set branch condition select register */
out_le32(&pi->dbdma->br_sel, (1 << 16) | 1);
/* write dma command buffer address to the dbdma chip */
out_le32(&pi->dbdma->cmdptr, pi->dbdma_ring.bus_cmd_start);
/* initialize the frame count and current period */
pi->current_period = 0;
pi->frame_count = in_le32(&i2sdev->intfregs->frame_count);
/* set the DMA controller running */
out_le32(&pi->dbdma->control, (RUN << 16) | RUN);
/* off you go! */
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
if (!pi->dbdma_ring.running) {
result = -EALREADY;
goto out_unlock;
}
pi->dbdma_ring.running = 0;
/* Set the S0 bit to make the DMA branch to the stop cmd */
out_le32(&pi->dbdma->control, (1 << 16) | 1);
pi->dbdma_ring.stopping = 1;
list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
if (cii->codec->stop)
cii->codec->stop(cii, pi->substream);
break;
default:
result = -EINVAL;
goto out_unlock;
}
out_unlock:
spin_unlock_irqrestore(&i2sdev->low_lock, flags);
return result;
}
static snd_pcm_uframes_t i2sbus_pcm_pointer(struct i2sbus_dev *i2sdev, int in)
{
struct pcm_info *pi;
u32 fc;
get_pcm_info(i2sdev, in, &pi, NULL);
fc = in_le32(&i2sdev->intfregs->frame_count);
fc = fc - pi->frame_count;
if (fc >= pi->substream->runtime->buffer_size)
fc %= pi->substream->runtime->buffer_size;
return fc;
}
static inline void handle_interrupt(struct i2sbus_dev *i2sdev, int in)
{
struct pcm_info *pi;
u32 fc, nframes;
u32 status;
int timeout, i;
int dma_stopped = 0;
struct snd_pcm_runtime *runtime;
spin_lock(&i2sdev->low_lock);
get_pcm_info(i2sdev, in, &pi, NULL);
if (!pi->dbdma_ring.running && !pi->dbdma_ring.stopping)
goto out_unlock;
i = pi->current_period;
runtime = pi->substream->runtime;
while (pi->dbdma_ring.cmds[i].xfer_status) {
if (le16_to_cpu(pi->dbdma_ring.cmds[i].xfer_status) & BT)
/*
* BT is the branch taken bit. If it took a branch
* it is because we set the S0 bit to make it
* branch to the stop command.
*/
dma_stopped = 1;
pi->dbdma_ring.cmds[i].xfer_status = 0;
if (++i >= runtime->periods) {
i = 0;
pi->frame_count += runtime->buffer_size;
}
pi->current_period = i;
/*
* Check the frame count. The DMA tends to get a bit
* ahead of the frame counter, which confuses the core.
*/
fc = in_le32(&i2sdev->intfregs->frame_count);
nframes = i * runtime->period_size;
if (fc < pi->frame_count + nframes)
pi->frame_count = fc - nframes;
}
if (dma_stopped) {
timeout = 1000;
for (;;) {
status = in_le32(&pi->dbdma->status);
if (!(status & ACTIVE) && (!in || (status & 0x80)))
break;
if (--timeout <= 0) {
printk(KERN_ERR "i2sbus: timed out "
"waiting for DMA to stop!\n");
break;
}
udelay(1);
}
/* Turn off DMA controller, clear S0 bit */
out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
pi->dbdma_ring.stopping = 0;
if (pi->stop_completion)
complete(pi->stop_completion);
}
if (!pi->dbdma_ring.running)
goto out_unlock;
spin_unlock(&i2sdev->low_lock);
/* may call _trigger again, hence needs to be unlocked */
snd_pcm_period_elapsed(pi->substream);
return;
out_unlock:
spin_unlock(&i2sdev->low_lock);
}
irqreturn_t i2sbus_tx_intr(int irq, void *devid)
{
handle_interrupt((struct i2sbus_dev *)devid, 0);
return IRQ_HANDLED;
}
irqreturn_t i2sbus_rx_intr(int irq, void *devid)
{
handle_interrupt((struct i2sbus_dev *)devid, 1);
return IRQ_HANDLED;
}
static int i2sbus_playback_open(struct snd_pcm_substream *substream)
{
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
if (!i2sdev)
return -EINVAL;
i2sdev->out.substream = substream;
return i2sbus_pcm_open(i2sdev, 0);
}
static int i2sbus_playback_close(struct snd_pcm_substream *substream)
{
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
int err;
if (!i2sdev)
return -EINVAL;
if (i2sdev->out.substream != substream)
return -EINVAL;
err = i2sbus_pcm_close(i2sdev, 0);
if (!err)
i2sdev->out.substream = NULL;
return err;
}
static int i2sbus_playback_prepare(struct snd_pcm_substream *substream)
{
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
if (!i2sdev)
return -EINVAL;
if (i2sdev->out.substream != substream)
return -EINVAL;
return i2sbus_pcm_prepare(i2sdev, 0);
}
static int i2sbus_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
if (!i2sdev)
return -EINVAL;
if (i2sdev->out.substream != substream)
return -EINVAL;
return i2sbus_pcm_trigger(i2sdev, 0, cmd);
}
static snd_pcm_uframes_t i2sbus_playback_pointer(struct snd_pcm_substream
*substream)
{
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
if (!i2sdev)
return -EINVAL;
if (i2sdev->out.substream != substream)
return 0;
return i2sbus_pcm_pointer(i2sdev, 0);
}
static struct snd_pcm_ops i2sbus_playback_ops = {
.open = i2sbus_playback_open,
.close = i2sbus_playback_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = i2sbus_hw_params,
.hw_free = i2sbus_playback_hw_free,
.prepare = i2sbus_playback_prepare,
.trigger = i2sbus_playback_trigger,
.pointer = i2sbus_playback_pointer,
};
static int i2sbus_record_open(struct snd_pcm_substream *substream)
{
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
if (!i2sdev)
return -EINVAL;
i2sdev->in.substream = substream;
return i2sbus_pcm_open(i2sdev, 1);
}
static int i2sbus_record_close(struct snd_pcm_substream *substream)
{
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
int err;
if (!i2sdev)
return -EINVAL;
if (i2sdev->in.substream != substream)
return -EINVAL;
err = i2sbus_pcm_close(i2sdev, 1);
if (!err)
i2sdev->in.substream = NULL;
return err;
}
static int i2sbus_record_prepare(struct snd_pcm_substream *substream)
{
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
if (!i2sdev)
return -EINVAL;
if (i2sdev->in.substream != substream)
return -EINVAL;
return i2sbus_pcm_prepare(i2sdev, 1);
}
static int i2sbus_record_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
if (!i2sdev)
return -EINVAL;
if (i2sdev->in.substream != substream)
return -EINVAL;
return i2sbus_pcm_trigger(i2sdev, 1, cmd);
}
static snd_pcm_uframes_t i2sbus_record_pointer(struct snd_pcm_substream
*substream)
{
struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
if (!i2sdev)
return -EINVAL;
if (i2sdev->in.substream != substream)
return 0;
return i2sbus_pcm_pointer(i2sdev, 1);
}
static struct snd_pcm_ops i2sbus_record_ops = {
.open = i2sbus_record_open,
.close = i2sbus_record_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = i2sbus_hw_params,
.hw_free = i2sbus_record_hw_free,
.prepare = i2sbus_record_prepare,
.trigger = i2sbus_record_trigger,
.pointer = i2sbus_record_pointer,
};
static void i2sbus_private_free(struct snd_pcm *pcm)
{
struct i2sbus_dev *i2sdev = snd_pcm_chip(pcm);
struct codec_info_item *p, *tmp;
i2sdev->sound.pcm = NULL;
i2sdev->out.created = 0;
i2sdev->in.created = 0;
list_for_each_entry_safe(p, tmp, &i2sdev->sound.codec_list, list) {
printk(KERN_ERR "i2sbus: a codec didn't unregister!\n");
list_del(&p->list);
module_put(p->codec->owner);
kfree(p);
}
soundbus_dev_put(&i2sdev->sound);
module_put(THIS_MODULE);
}
int
i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
struct codec_info *ci, void *data)
{
int err, in = 0, out = 0;
struct transfer_info *tmp;
struct i2sbus_dev *i2sdev = soundbus_dev_to_i2sbus_dev(dev);
struct codec_info_item *cii;
if (!dev->pcmname || dev->pcmid == -1) {
printk(KERN_ERR "i2sbus: pcm name and id must be set!\n");
return -EINVAL;
}
list_for_each_entry(cii, &dev->codec_list, list) {
if (cii->codec_data == data)
return -EALREADY;
}
if (!ci->transfers || !ci->transfers->formats
|| !ci->transfers->rates || !ci->usable)
return -EINVAL;
/* we currently code the i2s transfer on the clock, and support only
* 32 and 64 */
if (ci->bus_factor != 32 && ci->bus_factor != 64)
return -EINVAL;
/* If you want to fix this, you need to keep track of what transport infos
* are to be used, which codecs they belong to, and then fix all the
* sysclock/busclock stuff above to depend on which is usable */
list_for_each_entry(cii, &dev->codec_list, list) {
if (cii->codec->sysclock_factor != ci->sysclock_factor) {
printk(KERN_DEBUG
"cannot yet handle multiple different sysclocks!\n");
return -EINVAL;
}
if (cii->codec->bus_factor != ci->bus_factor) {
printk(KERN_DEBUG
"cannot yet handle multiple different bus clocks!\n");
return -EINVAL;
}
}
tmp = ci->transfers;
while (tmp->formats && tmp->rates) {
if (tmp->transfer_in)
in = 1;
else
out = 1;
tmp++;
}
cii = kzalloc(sizeof(struct codec_info_item), GFP_KERNEL);
if (!cii) {
printk(KERN_DEBUG "i2sbus: failed to allocate cii\n");
return -ENOMEM;
}
/* use the private data to point to the codec info */
cii->sdev = soundbus_dev_get(dev);
cii->codec = ci;
cii->codec_data = data;
if (!cii->sdev) {
printk(KERN_DEBUG
"i2sbus: failed to get soundbus dev reference\n");
err = -ENODEV;
goto out_free_cii;
}
if (!try_module_get(THIS_MODULE)) {
printk(KERN_DEBUG "i2sbus: failed to get module reference!\n");
err = -EBUSY;
goto out_put_sdev;
}
if (!try_module_get(ci->owner)) {
printk(KERN_DEBUG
"i2sbus: failed to get module reference to codec owner!\n");
err = -EBUSY;
goto out_put_this_module;
}
if (!dev->pcm) {
err = snd_pcm_new(card, dev->pcmname, dev->pcmid, 0, 0,
&dev->pcm);
if (err) {
printk(KERN_DEBUG "i2sbus: failed to create pcm\n");
goto out_put_ci_module;
}
dev->pcm->dev = &dev->ofdev.dev;
}
/* ALSA yet again sucks.
* If it is ever fixed, remove this line. See below. */
out = in = 1;
if (!i2sdev->out.created && out) {
if (dev->pcm->card != card) {
/* eh? */
printk(KERN_ERR
"Can't attach same bus to different cards!\n");
err = -EINVAL;
goto out_put_ci_module;
}
err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 1);
if (err)
goto out_put_ci_module;
snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
&i2sbus_playback_ops);
i2sdev->out.created = 1;
}
if (!i2sdev->in.created && in) {
if (dev->pcm->card != card) {
printk(KERN_ERR
"Can't attach same bus to different cards!\n");
err = -EINVAL;
goto out_put_ci_module;
}
err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 1);
if (err)
goto out_put_ci_module;
snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
&i2sbus_record_ops);
i2sdev->in.created = 1;
}
/* so we have to register the pcm after adding any substream
* to it because alsa doesn't create the devices for the
* substreams when we add them later.
* Therefore, force in and out on both busses (above) and
* register the pcm now instead of just after creating it.
*/
err = snd_device_register(card, dev->pcm);
if (err) {
printk(KERN_ERR "i2sbus: error registering new pcm\n");
goto out_put_ci_module;
}
/* no errors any more, so let's add this to our list */
list_add(&cii->list, &dev->codec_list);
dev->pcm->private_data = i2sdev;
dev->pcm->private_free = i2sbus_private_free;
/* well, we really should support scatter/gather DMA */
snd_pcm_lib_preallocate_pages_for_all(
dev->pcm, SNDRV_DMA_TYPE_DEV,
snd_dma_pci_data(macio_get_pci_dev(i2sdev->macio)),
64 * 1024, 64 * 1024);
return 0;
out_put_ci_module:
module_put(ci->owner);
out_put_this_module:
module_put(THIS_MODULE);
out_put_sdev:
soundbus_dev_put(dev);
out_free_cii:
kfree(cii);
return err;
}
void i2sbus_detach_codec(struct soundbus_dev *dev, void *data)
{
struct codec_info_item *cii = NULL, *i;
list_for_each_entry(i, &dev->codec_list, list) {
if (i->codec_data == data) {
cii = i;
break;
}
}
if (cii) {
list_del(&cii->list);
module_put(cii->codec->owner);
kfree(cii);
}
/* no more codecs, but still a pcm? */
if (list_empty(&dev->codec_list) && dev->pcm) {
/* the actual cleanup is done by the callback above! */
snd_device_free(dev->pcm->card, dev->pcm);
}
}