sa11xx-uda1341.c

linux环境下ALSA驱动范例

			snd_assert(dma_size <= DMA_BUF_SIZE, );
		}
#ifdef HH_VERSION
		ret = sa1100_dma_queue_buffer(s->dmach, s, runtime->dma_addr + offset, dma_size);
		if (ret)
			return; //FIXME
#else
		ret = sa1100_start_dma((s)->dma_regs, runtime->dma_addr + offset, dma_size);
		if (ret) {
			printk(KERN_ERR "audio_process_dma: cannot queue DMA buffer (%i)\n", ret);
			return;
		}
#endif

		s->period++;
		s->period %= runtime->periods;
		s->periods++;
	}
}

#ifdef HH_VERSION
static void audio_dma_callback(void *data, int size)
#else
static void audio_dma_callback(void *data)
#endif
{
	struct audio_stream *s = data;
        
	/* 
	 * If we are getting a callback for an active stream then we inform
	 * the PCM middle layer we've finished a period
	 */
 	if (s->active)
		snd_pcm_period_elapsed(s->stream);

	spin_lock(&s->dma_lock);
	if (!s->tx_spin && s->periods > 0)
		s->periods--;
	audio_process_dma(s);
	spin_unlock(&s->dma_lock);
}

/* }}} */

/* {{{ PCM setting */

/* {{{ trigger & timer */

static int snd_sa11xx_uda1341_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct sa11xx_uda1341 *chip = snd_pcm_substream_chip(substream);
	int stream_id = substream->pstr->stream;
	struct audio_stream *s = &chip->s[stream_id];
	struct audio_stream *s1 = &chip->s[stream_id ^ 1];
	int err = 0;

	/* note local interrupts are already disabled in the midlevel code */
	spin_lock(&s->dma_lock);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		/* now we need to make sure a record only stream has a clock */
		if (stream_id == SNDRV_PCM_STREAM_CAPTURE && !s1->active) {
			/* we need to force fill the xmit DMA with zeros */
			s1->tx_spin = 1;
			audio_process_dma(s1);
		}
		/* this case is when you were recording then you turn on a
		 * playback stream so we stop (also clears it) the dma first,
		 * clear the sync flag and then we let it turned on
		 */		
		else {
 			s->tx_spin = 0;
 		}

		/* requested stream startup */
		s->active = 1;
		audio_process_dma(s);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		/* requested stream shutdown */
		audio_stop_dma(s);
		
		/*
		 * now we need to make sure a record only stream has a clock
		 * so if we're stopping a playback with an active capture
		 * we need to turn the 0 fill dma on for the xmit side
		 */
		if (stream_id == SNDRV_PCM_STREAM_PLAYBACK && s1->active) {
			/* we need to force fill the xmit DMA with zeros */
			s->tx_spin = 1;
			audio_process_dma(s);
		}
		/*
		 * we killed a capture only stream, so we should also kill
		 * the zero fill transmit
		 */
		else {
			if (s1->tx_spin) {
				s1->tx_spin = 0;
				audio_stop_dma(s1);
			}
		}
		
		break;
	case SNDRV_PCM_TRIGGER_SUSPEND:
		s->active = 0;
#ifdef HH_VERSION		
		sa1100_dma_stop(s->dmach);
#else
		//FIXME - DMA API
#endif		
		s->old_offset = audio_get_dma_pos(s) + 1;
#ifdef HH_VERSION		
		sa1100_dma_flush_all(s->dmach);
#else
		//FIXME - DMA API
#endif		
		s->periods = 0;
		break;
	case SNDRV_PCM_TRIGGER_RESUME:
		s->active = 1;
		s->tx_spin = 0;
		audio_process_dma(s);
		if (stream_id == SNDRV_PCM_STREAM_CAPTURE && !s1->active) {
			s1->tx_spin = 1;
			audio_process_dma(s1);
		}
		break;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
#ifdef HH_VERSION		
		sa1100_dma_stop(s->dmach);
#else
		//FIXME - DMA API
#endif
		s->active = 0;
		if (stream_id == SNDRV_PCM_STREAM_PLAYBACK) {
			if (s1->active) {
				s->tx_spin = 1;
				s->old_offset = audio_get_dma_pos(s) + 1;
#ifdef HH_VERSION				
				sa1100_dma_flush_all(s->dmach);
#else
				//FIXME - DMA API
#endif				
				audio_process_dma(s);
			}
		} else {
			if (s1->tx_spin) {
				s1->tx_spin = 0;
#ifdef HH_VERSION				
				sa1100_dma_flush_all(s1->dmach);
#else
				//FIXME - DMA API
#endif				
			}
		}
		break;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		s->active = 1;
		if (s->old_offset) {
			s->tx_spin = 0;
			audio_process_dma(s);
			break;
		}
		if (stream_id == SNDRV_PCM_STREAM_CAPTURE && !s1->active) {
			s1->tx_spin = 1;
			audio_process_dma(s1);
		}
#ifdef HH_VERSION		
		sa1100_dma_resume(s->dmach);
#else
		//FIXME - DMA API
#endif
		break;
	default:
		err = -EINVAL;
		break;
	}
	spin_unlock(&s->dma_lock);	
	return err;
}

static int snd_sa11xx_uda1341_prepare(struct snd_pcm_substream *substream)
{
	struct sa11xx_uda1341 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct audio_stream *s = &chip->s[substream->pstr->stream];
        
	/* set requested samplerate */
	sa11xx_uda1341_set_samplerate(chip, runtime->rate);

	/* set requestd format when available */
	/* set FMT here !!! FIXME */

	s->period = 0;
	s->periods = 0;
        
	return 0;
}

static snd_pcm_uframes_t snd_sa11xx_uda1341_pointer(struct snd_pcm_substream *substream)
{
	struct sa11xx_uda1341 *chip = snd_pcm_substream_chip(substream);
	return audio_get_dma_pos(&chip->s[substream->pstr->stream]);
}

/* }}} */

static struct snd_pcm_hardware snd_sa11xx_uda1341_capture =
{
	.info			= (SNDRV_PCM_INFO_INTERLEAVED |
				   SNDRV_PCM_INFO_BLOCK_TRANSFER |
				   SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
				   SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
	.rates			= (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
				   SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |\
				   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |\
				   SNDRV_PCM_RATE_KNOT),
	.rate_min		= 8000,
	.rate_max		= 48000,
	.channels_min		= 2,
	.channels_max		= 2,
	.buffer_bytes_max	= 64*1024,
	.period_bytes_min	= 64,
	.period_bytes_max	= DMA_BUF_SIZE,
	.periods_min		= 2,
	.periods_max		= 255,
	.fifo_size		= 0,
};

static struct snd_pcm_hardware snd_sa11xx_uda1341_playback =
{
	.info			= (SNDRV_PCM_INFO_INTERLEAVED |
				   SNDRV_PCM_INFO_BLOCK_TRANSFER |
				   SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
				   SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
	.rates			= (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
                                   SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |\
				   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |\
				   SNDRV_PCM_RATE_KNOT),
	.rate_min		= 8000,
	.rate_max		= 48000,
	.channels_min		= 2,
	.channels_max		= 2,
	.buffer_bytes_max	= 64*1024,
	.period_bytes_min	= 64,
	.period_bytes_max	= DMA_BUF_SIZE,
	.periods_min		= 2,
	.periods_max		= 255,
	.fifo_size		= 0,
};

static int snd_card_sa11xx_uda1341_open(struct snd_pcm_substream *substream)
{
	struct sa11xx_uda1341 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int stream_id = substream->pstr->stream;
	int err;

	chip->s[stream_id].stream = substream;

	if (stream_id == SNDRV_PCM_STREAM_PLAYBACK)
		runtime->hw = snd_sa11xx_uda1341_playback;
	else
		runtime->hw = snd_sa11xx_uda1341_capture;
	if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
		return err;
	if ((err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates)) < 0)
		return err;
        
	return 0;
}

static int snd_card_sa11xx_uda1341_close(struct snd_pcm_substream *substream)
{
	struct sa11xx_uda1341 *chip = snd_pcm_substream_chip(substream);

	chip->s[substream->pstr->stream].stream = NULL;
	return 0;
}

/* {{{ HW params & free */

static int snd_sa11xx_uda1341_hw_params(struct snd_pcm_substream *substream,
					struct snd_pcm_hw_params *hw_params)
{
        
	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
}

static int snd_sa11xx_uda1341_hw_free(struct snd_pcm_substream *substream)
{
	return snd_pcm_lib_free_pages(substream);
}

/* }}} */

static struct snd_pcm_ops snd_card_sa11xx_uda1341_playback_ops = {
	.open			= snd_card_sa11xx_uda1341_open,
	.close			= snd_card_sa11xx_uda1341_close,
	.ioctl			= snd_pcm_lib_ioctl,
	.hw_params	        = snd_sa11xx_uda1341_hw_params,
	.hw_free	        = snd_sa11xx_uda1341_hw_free,
	.prepare		= snd_sa11xx_uda1341_prepare,
	.trigger		= snd_sa11xx_uda1341_trigger,
	.pointer		= snd_sa11xx_uda1341_pointer,
};

static struct snd_pcm_ops snd_card_sa11xx_uda1341_capture_ops = {
	.open			= snd_card_sa11xx_uda1341_open,
	.close			= snd_card_sa11xx_uda1341_close,
	.ioctl			= snd_pcm_lib_ioctl,
	.hw_params	        = snd_sa11xx_uda1341_hw_params,
	.hw_free	        = snd_sa11xx_uda1341_hw_free,
	.prepare		= snd_sa11xx_uda1341_prepare,
	.trigger		= snd_sa11xx_uda1341_trigger,
	.pointer		= snd_sa11xx_uda1341_pointer,
};

static int __init snd_card_sa11xx_uda1341_pcm(struct sa11xx_uda1341 *sa11xx_uda1341, int device)
{
	struct snd_pcm *pcm;
	int err;

	if ((err = snd_pcm_new(sa11xx_uda1341->card, "UDA1341 PCM", device, 1, 1, &pcm)) < 0)
		return err;

	/*
	 * this sets up our initial buffers and sets the dma_type to isa.
	 * isa works but I'm not sure why (or if) it's the right choice
	 * this may be too large, trying it for now
	 */
	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, 
					      snd_dma_isa_data(),
					      64*1024, 64*1024);

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_sa11xx_uda1341_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_sa11xx_uda1341_capture_ops);
	pcm->private_data = sa11xx_uda1341;
	pcm->info_flags = 0;
	strcpy(pcm->name, "UDA1341 PCM");

	sa11xx_uda1341_audio_init(sa11xx_uda1341);

	/* setup DMA controller */
	audio_dma_request(&sa11xx_uda1341->s[SNDRV_PCM_STREAM_PLAYBACK], audio_dma_callback);
	audio_dma_request(&sa11xx_uda1341->s[SNDRV_PCM_STREAM_CAPTURE], audio_dma_callback);

	sa11xx_uda1341->pcm = pcm;

	return 0;
}

/* }}} */

/* {{{ module init & exit */

#ifdef CONFIG_PM

static int snd_sa11xx_uda1341_suspend(struct platform_device *devptr,
				      pm_message_t state)
{
	struct snd_card *card = platform_get_drvdata(devptr);
	struct sa11xx_uda1341 *chip = card->private_data;

	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
	snd_pcm_suspend_all(chip->pcm);
#ifdef HH_VERSION
	sa1100_dma_sleep(chip->s[SNDRV_PCM_STREAM_PLAYBACK].dmach);
	sa1100_dma_sleep(chip->s[SNDRV_PCM_STREAM_CAPTURE].dmach);
#else
	//FIXME
#endif
	l3_command(chip->uda1341, CMD_SUSPEND, NULL);
	sa11xx_uda1341_audio_shutdown(chip);

	return 0;
}

static int snd_sa11xx_uda1341_resume(struct platform_device *devptr)
{
	struct snd_card *card = platform_get_drvdata(devptr);
	struct sa11xx_uda1341 *chip = card->private_data;

	sa11xx_uda1341_audio_init(chip);
	l3_command(chip->uda1341, CMD_RESUME, NULL);
#ifdef HH_VERSION	
	sa1100_dma_wakeup(chip->s[SNDRV_PCM_STREAM_PLAYBACK].dmach);
	sa1100_dma_wakeup(chip->s[SNDRV_PCM_STREAM_CAPTURE].dmach);
#else
	//FIXME
#endif
	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
	return 0;
}
#endif /* COMFIG_PM */

void snd_sa11xx_uda1341_free(struct snd_card *card)
{
	struct sa11xx_uda1341 *chip = card->private_data;

	audio_dma_free(&chip->s[SNDRV_PCM_STREAM_PLAYBACK]);
	audio_dma_free(&chip->s[SNDRV_PCM_STREAM_CAPTURE]);
}

static int __init sa11xx_uda1341_probe(struct platform_device *devptr)
{
	int err;
	struct snd_card *card;
	struct sa11xx_uda1341 *chip;

	/* register the soundcard */
	card = snd_card_new(-1, id, THIS_MODULE, sizeof(struct sa11xx_uda1341));
	if (card == NULL)
		return -ENOMEM;

	chip = card->private_data;
	spin_lock_init(&chip->s[0].dma_lock);
	spin_lock_init(&chip->s[1].dma_lock);

	card->private_free = snd_sa11xx_uda1341_free;
	chip->card = card;
	chip->samplerate = AUDIO_RATE_DEFAULT;

	// mixer
	if ((err = snd_chip_uda1341_mixer_new(card, &chip->uda1341)))
		goto nodev;

	// PCM
	if ((err = snd_card_sa11xx_uda1341_pcm(chip, 0)) < 0)
		goto nodev;
        
	strcpy(card->driver, "UDA1341");
	strcpy(card->shortname, "H3600 UDA1341TS");
	sprintf(card->longname, "Compaq iPAQ H3600 with Philips UDA1341TS");
        
	snd_card_set_dev(card, &devptr->dev);

	if ((err = snd_card_register(card)) == 0) {
		printk( KERN_INFO "iPAQ audio support initialized\n" );
		platform_set_drvdata(devptr, card);
		return 0;
	}
        
 nodev:
	snd_card_free(card);
	return err;
}

static int __devexit sa11xx_uda1341_remove(struct platform_device *devptr)
{
	snd_card_free(platform_get_drvdata(devptr));
	platform_set_drvdata(devptr, NULL);
	return 0;
}

#define SA11XX_UDA1341_DRIVER	"sa11xx_uda1341"

static struct platform_driver sa11xx_uda1341_driver = {
	.probe		= sa11xx_uda1341_probe,
	.remove		= __devexit_p(sa11xx_uda1341_remove),
#ifdef CONFIG_PM
	.suspend	= snd_sa11xx_uda1341_suspend,
	.resume		= snd_sa11xx_uda1341_resume,
#endif
	.driver		= {
		.name	= SA11XX_UDA1341_DRIVER,
	},
};

static int __init sa11xx_uda1341_init(void)
{
	int err;

	if (!machine_is_h3xxx())
		return -ENODEV;
	if ((err = platform_driver_register(&sa11xx_uda1341_driver)) < 0)
		return err;
	device = platform_device_register_simple(SA11XX_UDA1341_DRIVER, -1, NULL, 0);
	if (IS_ERR(device)) {
		platform_driver_unregister(&sa11xx_uda1341_driver);
		return PTR_ERR(device);
	}
	return 0;
}

static void __exit sa11xx_uda1341_exit(void)
{
	platform_device_unregister(device);
	platform_driver_unregister(&sa11xx_uda1341_driver);
}

module_init(sa11xx_uda1341_init);
module_exit(sa11xx_uda1341_exit);

/* }}} */

/*
 * Local variables:
 * indent-tabs-mode: t
 * End:
 */