--- /dev/null
+/*
+ * 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>
+/* So apparently there's a reason for requiring driver.h
+ * to be included first, even if I don't know it... */
+#include <sound/driver.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;
+
+ 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;
+ 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 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 int i2sbus_hw_free(struct snd_pcm_substream *substream)
+{
+ snd_pcm_lib_free_pages(substream);
+ return 0;
+}
+
+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;
+ 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;
+
+ mutex_lock(&i2sdev->lock);
+
+ get_pcm_info(i2sdev, in, &pi, &other);
+
+ if (pi->dbdma_ring.running) {
+ result = -EBUSY;
+ 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);
+ pi->current_period = 0;
+
+ /* generate dbdma command ring first */
+ command = pi->dbdma_ring.cmds;
+ offset = runtime->dma_addr;
+ for (i = 0; i < pi->substream->runtime->periods;
+ i++, command++, offset += periodsize) {
+ memset(command, 0, sizeof(struct dbdma_cmd));
+ command->command =
+ cpu_to_le16((in ? INPUT_MORE : OUTPUT_MORE) | INTR_ALWAYS);
+ command->phy_addr = cpu_to_le32(offset);
+ command->req_count = cpu_to_le16(periodsize);
+ command->xfer_status = cpu_to_le16(0);
+ }
+ /* last one branches back to first */
+ command--;
+ command->command |= cpu_to_le16(BR_ALWAYS);
+ command->cmd_dep = cpu_to_le32(pi->dbdma_ring.bus_cmd_start);
+
+ /* 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;
+}
+
+static struct dbdma_cmd STOP_CMD = {
+ .command = __constant_cpu_to_le16(DBDMA_STOP),
+};
+
+static int i2sbus_pcm_trigger(struct i2sbus_dev *i2sdev, int in, int cmd)
+{
+ struct codec_info_item *cii;
+ struct pcm_info *pi;
+ int timeout;
+ struct dbdma_cmd tmp;
+ 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;
+
+ /* reset dma engine */
+ out_le32(&pi->dbdma->control,
+ 0 | (RUN | PAUSE | FLUSH | WAKE) << 16);
+ timeout = 100;
+ while (in_le32(&pi->dbdma->status) & RUN && timeout--)
+ udelay(1);
+ if (timeout <= 0) {
+ printk(KERN_ERR
+ "i2sbus: error waiting for dma reset\n");
+ result = -ENXIO;
+ goto out_unlock;
+ }
+
+ /* write dma command buffer address to the dbdma chip */
+ out_le32(&pi->dbdma->cmdptr, pi->dbdma_ring.bus_cmd_start);
+ /* post PCI write */
+ mb();
+ (void)in_le32(&pi->dbdma->status);
+
+ /* change first command to STOP */
+ tmp = *pi->dbdma_ring.cmds;
+ *pi->dbdma_ring.cmds = STOP_CMD;
+
+ /* set running state, remember that the first command is STOP */
+ out_le32(&pi->dbdma->control, RUN | (RUN << 16));
+ timeout = 100;
+ /* wait for STOP to be executed */
+ while (in_le32(&pi->dbdma->status) & ACTIVE && timeout--)
+ udelay(1);
+ if (timeout <= 0) {
+ printk(KERN_ERR "i2sbus: error waiting for dma stop\n");
+ result = -ENXIO;
+ goto out_unlock;
+ }
+ /* again, write dma command buffer address to the dbdma chip,
+ * this time of the first real command */
+ *pi->dbdma_ring.cmds = tmp;
+ out_le32(&pi->dbdma->cmdptr, pi->dbdma_ring.bus_cmd_start);
+ /* post write */
+ mb();
+ (void)in_le32(&pi->dbdma->status);
+
+ /* reset dma engine again */
+ out_le32(&pi->dbdma->control,
+ 0 | (RUN | PAUSE | FLUSH | WAKE) << 16);
+ timeout = 100;
+ while (in_le32(&pi->dbdma->status) & RUN && timeout--)
+ udelay(1);
+ if (timeout <= 0) {
+ printk(KERN_ERR
+ "i2sbus: error waiting for dma reset\n");
+ result = -ENXIO;
+ goto out_unlock;
+ }
+
+ /* wake up the chip with the next descriptor */
+ out_le32(&pi->dbdma->control,
+ (RUN | WAKE) | ((RUN | WAKE) << 16));
+ /* get the frame count */
+ pi->frame_count = in_le32(&i2sdev->intfregs->frame_count);
+
+ /* off you go! */
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ if (!pi->dbdma_ring.running) {
+ result = -EALREADY;
+ goto out_unlock;
+ }
+
+ /* turn off all relevant bits */
+ out_le32(&pi->dbdma->control,
+ (RUN | WAKE | FLUSH | PAUSE) << 16);
+ {
+ /* FIXME: move to own function */
+ int timeout = 5000;
+ while ((in_le32(&pi->dbdma->status) & RUN)
+ && --timeout > 0)
+ udelay(1);
+ if (!timeout)
+ printk(KERN_ERR
+ "i2sbus: timed out turning "
+ "off dbdma engine!\n");
+ }
+
+ pi->dbdma_ring.running = 0;
+ 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;
+
+ return (bytes_to_frames(pi->substream->runtime,
+ pi->current_period *
+ snd_pcm_lib_period_bytes(pi->substream))
+ + fc) % pi->substream->runtime->buffer_size;
+}
+
+static inline void handle_interrupt(struct i2sbus_dev *i2sdev, int in)
+{
+ struct pcm_info *pi;
+ u32 fc;
+ u32 delta;
+
+ spin_lock(&i2sdev->low_lock);
+ get_pcm_info(i2sdev, in, &pi, NULL);
+
+ if (!pi->dbdma_ring.running) {
+ /* there was still an interrupt pending
+ * while we stopped. or maybe another
+ * processor (not the one that was stopping
+ * the DMA engine) was spinning above
+ * waiting for the lock. */
+ goto out_unlock;
+ }
+
+ fc = in_le32(&i2sdev->intfregs->frame_count);
+ /* a counter overflow does not change the calculation. */
+ delta = fc - pi->frame_count;
+
+ /* update current_period */
+ while (delta >= pi->substream->runtime->period_size) {
+ pi->current_period++;
+ delta = delta - pi->substream->runtime->period_size;
+ }
+
+ if (unlikely(delta)) {
+ /* Some interrupt came late, so check the dbdma.
+ * This special case exists to syncronize the frame_count with
+ * the dbdma transfer, but is hit every once in a while. */
+ int period;
+
+ period = (in_le32(&pi->dbdma->cmdptr)
+ - pi->dbdma_ring.bus_cmd_start)
+ / sizeof(struct dbdma_cmd);
+ pi->current_period = pi->current_period
+ % pi->substream->runtime->periods;
+
+ while (pi->current_period != period) {
+ pi->current_period++;
+ pi->current_period %= pi->substream->runtime->periods;
+ /* Set delta to zero, as the frame_count value is too
+ * high (otherwise the code path will not be executed).
+ * This corrects the fact that the frame_count is too
+ * low at the beginning due to buffering. */
+ delta = 0;
+ }
+ }
+
+ pi->frame_count = fc - delta;
+ pi->current_period %= pi->substream->runtime->periods;
+
+ 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, struct pt_regs *regs)
+{
+ handle_interrupt((struct i2sbus_dev *)devid, 0);
+ return IRQ_HANDLED;
+}
+
+irqreturn_t i2sbus_rx_intr(int irq, void *devid, struct pt_regs * regs)
+{
+ 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_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_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);
+}
+
+/* FIXME: this function needs an error handling strategy with labels */
+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");
+ kfree(cii);
+ return -ENODEV;
+ }
+
+ if (!try_module_get(THIS_MODULE)) {
+ printk(KERN_DEBUG "i2sbus: failed to get module reference!\n");
+ soundbus_dev_put(dev);
+ kfree(cii);
+ return -EBUSY;
+ }
+
+ if (!try_module_get(ci->owner)) {
+ printk(KERN_DEBUG
+ "i2sbus: failed to get module reference to codec owner!\n");
+ module_put(THIS_MODULE);
+ soundbus_dev_put(dev);
+ kfree(cii);
+ return -EBUSY;
+ }
+
+ 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");
+ kfree(cii);
+ module_put(ci->owner);
+ soundbus_dev_put(dev);
+ module_put(THIS_MODULE);
+ return err;
+ }
+ }
+
+ /* 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");
+ module_put(ci->owner);
+ kfree(cii);
+ soundbus_dev_put(dev);
+ module_put(THIS_MODULE);
+ return -EINVAL;
+ }
+ if ((err =
+ snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 1))) {
+ module_put(ci->owner);
+ kfree(cii);
+ soundbus_dev_put(dev);
+ module_put(THIS_MODULE);
+ return err;
+ }
+ 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");
+ module_put(ci->owner);
+ kfree(cii);
+ soundbus_dev_put(dev);
+ module_put(THIS_MODULE);
+ return -EINVAL;
+ }
+ if ((err =
+ snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 1))) {
+ module_put(ci->owner);
+ kfree(cii);
+ soundbus_dev_put(dev);
+ module_put(THIS_MODULE);
+ return err;
+ }
+ 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");
+ module_put(ci->owner);
+ kfree(cii);
+ soundbus_dev_put(dev);
+ module_put(THIS_MODULE);
+ return err;
+ }
+ /* 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;
+}
+
+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);
+ }
+}
git://git.onelab.eu / linux-2.6.git / blobdiff