korg1212.c

LINUX 2.6.17.4的源码

	K1212_DEBUG_PRINTK("K1212_DEBUG: snd_korg1212_playback_close [%s]\n",
			   stateName[korg1212->cardState]);

	snd_korg1212_silence(korg1212, 0, K1212_MAX_SAMPLES, 0, korg1212->channels * 2);

        spin_lock_irqsave(&korg1212->lock, flags);

	korg1212->playback_pid = -1;
        korg1212->playback_substream = NULL;
        korg1212->periodsize = 0;

        spin_unlock_irqrestore(&korg1212->lock, flags);

	snd_korg1212_CloseCard(korg1212);
        return 0;
}

static int snd_korg1212_capture_close(struct snd_pcm_substream *substream)
{
        unsigned long flags;
        struct snd_korg1212 *korg1212 = snd_pcm_substream_chip(substream);

	K1212_DEBUG_PRINTK("K1212_DEBUG: snd_korg1212_capture_close [%s]\n",
			   stateName[korg1212->cardState]);

        spin_lock_irqsave(&korg1212->lock, flags);

	korg1212->capture_pid = -1;
        korg1212->capture_substream = NULL;
        korg1212->periodsize = 0;

        spin_unlock_irqrestore(&korg1212->lock, flags);

	snd_korg1212_CloseCard(korg1212);
        return 0;
}

static int snd_korg1212_ioctl(struct snd_pcm_substream *substream,
			     unsigned int cmd, void *arg)
{
	K1212_DEBUG_PRINTK("K1212_DEBUG: snd_korg1212_ioctl: cmd=%d\n", cmd);

	if (cmd == SNDRV_PCM_IOCTL1_CHANNEL_INFO ) {
		struct snd_pcm_channel_info *info = arg;
        	info->offset = 0;
        	info->first = info->channel * 16;
        	info->step = 256;
		K1212_DEBUG_PRINTK("K1212_DEBUG: channel_info %d:, offset=%ld, first=%d, step=%d\n", info->channel, info->offset, info->first, info->step);
		return 0;
	}

        return snd_pcm_lib_ioctl(substream, cmd, arg);
}

static int snd_korg1212_hw_params(struct snd_pcm_substream *substream,
                             struct snd_pcm_hw_params *params)
{
        unsigned long flags;
        struct snd_korg1212 *korg1212 = snd_pcm_substream_chip(substream);
        int err;
	pid_t this_pid;
	pid_t other_pid;

	K1212_DEBUG_PRINTK("K1212_DEBUG: snd_korg1212_hw_params [%s]\n",
			   stateName[korg1212->cardState]);

        spin_lock_irqsave(&korg1212->lock, flags);

	if (substream->pstr->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		this_pid = korg1212->playback_pid;
		other_pid = korg1212->capture_pid;
	} else {
		this_pid = korg1212->capture_pid;
		other_pid = korg1212->playback_pid;
	}

	if ((other_pid > 0) && (this_pid != other_pid)) {

		/* The other stream is open, and not by the same
		   task as this one. Make sure that the parameters
		   that matter are the same.
		 */

		if ((int)params_rate(params) != korg1212->clkRate) {
			spin_unlock_irqrestore(&korg1212->lock, flags);
			_snd_pcm_hw_param_setempty(params, SNDRV_PCM_HW_PARAM_RATE);
			return -EBUSY;
		}

        	spin_unlock_irqrestore(&korg1212->lock, flags);
	        return 0;
	}

        if ((err = snd_korg1212_SetRate(korg1212, params_rate(params))) < 0) {
                spin_unlock_irqrestore(&korg1212->lock, flags);
                return err;
        }

	korg1212->channels = params_channels(params);
        korg1212->periodsize = K1212_PERIOD_BYTES;

        spin_unlock_irqrestore(&korg1212->lock, flags);

        return 0;
}

static int snd_korg1212_prepare(struct snd_pcm_substream *substream)
{
        struct snd_korg1212 *korg1212 = snd_pcm_substream_chip(substream);
	int rc;

	K1212_DEBUG_PRINTK("K1212_DEBUG: snd_korg1212_prepare [%s]\n",
			   stateName[korg1212->cardState]);

	spin_lock_irq(&korg1212->lock);

	/* FIXME: we should wait for ack! */
	if (korg1212->stop_pending_cnt > 0) {
		K1212_DEBUG_PRINTK("K1212_DEBUG: snd_korg1212_prepare - Stop is pending... [%s]\n",
				   stateName[korg1212->cardState]);
        	spin_unlock_irq(&korg1212->lock);
		return -EAGAIN;
		/*
		korg1212->sharedBufferPtr->cardCommand = 0;
		del_timer(&korg1212->timer);
		korg1212->stop_pending_cnt = 0;
		*/
	}

        rc = snd_korg1212_SetupForPlay(korg1212);

        korg1212->currentBuffer = 0;

        spin_unlock_irq(&korg1212->lock);

	return rc ? -EINVAL : 0;
}

static int snd_korg1212_trigger(struct snd_pcm_substream *substream,
                           int cmd)
{
        struct snd_korg1212 *korg1212 = snd_pcm_substream_chip(substream);
	int rc;

	K1212_DEBUG_PRINTK("K1212_DEBUG: snd_korg1212_trigger [%s] cmd=%d\n",
			   stateName[korg1212->cardState], cmd);

	spin_lock(&korg1212->lock);
        switch (cmd) {
                case SNDRV_PCM_TRIGGER_START:
/*
			if (korg1212->running) {
				K1212_DEBUG_PRINTK_VERBOSE("K1212_DEBUG: snd_korg1212_trigger: Already running?\n");
				break;
			}
*/
                        korg1212->running++;
                        rc = snd_korg1212_TriggerPlay(korg1212);
                        break;

                case SNDRV_PCM_TRIGGER_STOP:
/*
			if (!korg1212->running) {
				K1212_DEBUG_PRINTK_VERBOSE("K1212_DEBUG: snd_korg1212_trigger: Already stopped?\n");
				break;
			}
*/
                        korg1212->running--;
                        rc = snd_korg1212_StopPlay(korg1212);
                        break;

                default:
			rc = 1;
			break;
        }
	spin_unlock(&korg1212->lock);
        return rc ? -EINVAL : 0;
}

static snd_pcm_uframes_t snd_korg1212_playback_pointer(struct snd_pcm_substream *substream)
{
        struct snd_korg1212 *korg1212 = snd_pcm_substream_chip(substream);
        snd_pcm_uframes_t pos;

	pos = korg1212->currentBuffer * kPlayBufferFrames;

	K1212_DEBUG_PRINTK_VERBOSE("K1212_DEBUG: snd_korg1212_playback_pointer [%s] %ld\n", 
				   stateName[korg1212->cardState], pos);

        return pos;
}

static snd_pcm_uframes_t snd_korg1212_capture_pointer(struct snd_pcm_substream *substream)
{
        struct snd_korg1212 *korg1212 = snd_pcm_substream_chip(substream);
        snd_pcm_uframes_t pos;

	pos = korg1212->currentBuffer * kPlayBufferFrames;

	K1212_DEBUG_PRINTK_VERBOSE("K1212_DEBUG: snd_korg1212_capture_pointer [%s] %ld\n",
				   stateName[korg1212->cardState], pos);

        return pos;
}

static int snd_korg1212_playback_copy(struct snd_pcm_substream *substream,
                        int channel, /* not used (interleaved data) */
                        snd_pcm_uframes_t pos,
                        void __user *src,
                        snd_pcm_uframes_t count)
{
        struct snd_korg1212 *korg1212 = snd_pcm_substream_chip(substream);

	K1212_DEBUG_PRINTK_VERBOSE("K1212_DEBUG: snd_korg1212_playback_copy [%s] %ld %ld\n",
				   stateName[korg1212->cardState], pos, count);
 
	return snd_korg1212_copy_from(korg1212, src, pos, count, 0, korg1212->channels * 2);

}

static int snd_korg1212_playback_silence(struct snd_pcm_substream *substream,
                           int channel, /* not used (interleaved data) */
                           snd_pcm_uframes_t pos,
                           snd_pcm_uframes_t count)
{
        struct snd_korg1212 *korg1212 = snd_pcm_substream_chip(substream);

	K1212_DEBUG_PRINTK_VERBOSE("K1212_DEBUG: snd_korg1212_playback_silence [%s]\n",
				   stateName[korg1212->cardState]);

	return snd_korg1212_silence(korg1212, pos, count, 0, korg1212->channels * 2);
}

static int snd_korg1212_capture_copy(struct snd_pcm_substream *substream,
                        int channel, /* not used (interleaved data) */
                        snd_pcm_uframes_t pos,
                        void __user *dst,
                        snd_pcm_uframes_t count)
{
        struct snd_korg1212 *korg1212 = snd_pcm_substream_chip(substream);

	K1212_DEBUG_PRINTK_VERBOSE("K1212_DEBUG: snd_korg1212_capture_copy [%s] %ld %ld\n",
				   stateName[korg1212->cardState], pos, count);

	return snd_korg1212_copy_to(korg1212, dst, pos, count, 0, korg1212->channels * 2);
}

static struct snd_pcm_ops snd_korg1212_playback_ops = {
        .open =		snd_korg1212_playback_open,
        .close =	snd_korg1212_playback_close,
        .ioctl =	snd_korg1212_ioctl,
        .hw_params =	snd_korg1212_hw_params,
        .prepare =	snd_korg1212_prepare,
        .trigger =	snd_korg1212_trigger,
        .pointer =	snd_korg1212_playback_pointer,
        .copy =		snd_korg1212_playback_copy,
        .silence =	snd_korg1212_playback_silence,
};

static struct snd_pcm_ops snd_korg1212_capture_ops = {
	.open =		snd_korg1212_capture_open,
	.close =	snd_korg1212_capture_close,
	.ioctl =	snd_korg1212_ioctl,
	.hw_params =	snd_korg1212_hw_params,
	.prepare =	snd_korg1212_prepare,
	.trigger =	snd_korg1212_trigger,
	.pointer =	snd_korg1212_capture_pointer,
	.copy =		snd_korg1212_capture_copy,
};

/*
 * Control Interface
 */

static int snd_korg1212_control_phase_info(struct snd_kcontrol *kcontrol,
					   struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
	uinfo->count = (kcontrol->private_value >= 8) ? 2 : 1;
	return 0;
}

static int snd_korg1212_control_phase_get(struct snd_kcontrol *kcontrol,
					  struct snd_ctl_elem_value *u)
{
	struct snd_korg1212 *korg1212 = snd_kcontrol_chip(kcontrol);
	int i = kcontrol->private_value;

	spin_lock_irq(&korg1212->lock);

        u->value.integer.value[0] = korg1212->volumePhase[i];

	if (i >= 8)
        	u->value.integer.value[1] = korg1212->volumePhase[i+1];

	spin_unlock_irq(&korg1212->lock);

        return 0;
}

static int snd_korg1212_control_phase_put(struct snd_kcontrol *kcontrol,
					  struct snd_ctl_elem_value *u)
{
	struct snd_korg1212 *korg1212 = snd_kcontrol_chip(kcontrol);
        int change = 0;
        int i, val;

	spin_lock_irq(&korg1212->lock);

	i = kcontrol->private_value;

	korg1212->volumePhase[i] = u->value.integer.value[0];

	val = korg1212->sharedBufferPtr->volumeData[kcontrol->private_value];

	if ((u->value.integer.value[0] > 0) != (val < 0)) {
		val = abs(val) * (korg1212->volumePhase[i] > 0 ? -1 : 1);
		korg1212->sharedBufferPtr->volumeData[i] = val;
		change = 1;
	}

	if (i >= 8) {
		korg1212->volumePhase[i+1] = u->value.integer.value[1];

		val = korg1212->sharedBufferPtr->volumeData[kcontrol->private_value+1];

		if ((u->value.integer.value[1] > 0) != (val < 0)) {
			val = abs(val) * (korg1212->volumePhase[i+1] > 0 ? -1 : 1);
			korg1212->sharedBufferPtr->volumeData[i+1] = val;
			change = 1;
		}
	}

	spin_unlock_irq(&korg1212->lock);

        return change;
}

static int snd_korg1212_control_volume_info(struct snd_kcontrol *kcontrol,
					    struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = (kcontrol->private_value >= 8) ? 2 : 1;
        uinfo->value.integer.min = k1212MinVolume;
	uinfo->value.integer.max = k1212MaxVolume;
        return 0;
}

static int snd_korg1212_control_volume_get(struct snd_kcontrol *kcontrol,
					   struct snd_ctl_elem_value *u)
{
	struct snd_korg1212 *korg1212 = snd_kcontrol_chip(kcontrol);
        int i;

	spin_lock_irq(&korg1212->lock);

	i = kcontrol->private_value;
        u->value.integer.value[0] = abs(korg1212->sharedBufferPtr->volumeData[i]);

	if (i >= 8) 
                u->value.integer.value[1] = abs(korg1212->sharedBuffe