/* * i2sbus driver -- pcm routines * * Copyright 2006 Johannes Berg * * GPL v2, can be found in COPYING. */ #include #include /* So apparently there's a reason for requiring driver.h * to be included first, even if I don't know it... */ #include #include #include #include #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); } }