echoaudio.c

linux 内核源代码

static int snd_echo_automute_get(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
{
	struct echoaudio *chip = snd_kcontrol_chip(kcontrol);

	ucontrol->value.integer.value[0] = chip->digital_in_automute;
	return 0;
}

static int snd_echo_automute_put(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
{
	struct echoaudio *chip = snd_kcontrol_chip(kcontrol);
	int automute, changed = 0;

	automute = !!ucontrol->value.integer.value[0];
	if (chip->digital_in_automute != automute) {
		spin_lock_irq(&chip->lock);
		changed = set_input_auto_mute(chip, automute);
		spin_unlock_irq(&chip->lock);
		if (changed == 0)
			changed = 1;	/* no errors */
	}
	return changed;
}

static struct snd_kcontrol_new snd_echo_automute_switch __devinitdata = {
	.name = "Digital Capture Switch (automute)",
	.iface = SNDRV_CTL_ELEM_IFACE_CARD,
	.info = snd_echo_automute_info,
	.get = snd_echo_automute_get,
	.put = snd_echo_automute_put,
};

#endif /* ECHOCARD_HAS_DIGITAL_IN_AUTOMUTE */



/******************* VU-meters switch *******************/
#define snd_echo_vumeters_switch_info		snd_ctl_boolean_mono_info

static int snd_echo_vumeters_switch_put(struct snd_kcontrol *kcontrol,
					struct snd_ctl_elem_value *ucontrol)
{
	struct echoaudio *chip;

	chip = snd_kcontrol_chip(kcontrol);
	spin_lock_irq(&chip->lock);
	set_meters_on(chip, ucontrol->value.integer.value[0]);
	spin_unlock_irq(&chip->lock);
	return 1;
}

static struct snd_kcontrol_new snd_echo_vumeters_switch __devinitdata = {
	.name = "VU-meters Switch",
	.iface = SNDRV_CTL_ELEM_IFACE_CARD,
	.access = SNDRV_CTL_ELEM_ACCESS_WRITE,
	.info = snd_echo_vumeters_switch_info,
	.put = snd_echo_vumeters_switch_put,
};



/***** Read VU-meters (input, output, analog and digital together) *****/
static int snd_echo_vumeters_info(struct snd_kcontrol *kcontrol,
				  struct snd_ctl_elem_info *uinfo)
{
	struct echoaudio *chip;

	chip = snd_kcontrol_chip(kcontrol);
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 96;
	uinfo->value.integer.min = ECHOGAIN_MINOUT;
	uinfo->value.integer.max = 0;
#ifdef ECHOCARD_HAS_VMIXER
	uinfo->dimen.d[0] = 3;	/* Out, In, Virt */
#else
	uinfo->dimen.d[0] = 2;	/* Out, In */
#endif
	uinfo->dimen.d[1] = 16;	/* 16 channels */
	uinfo->dimen.d[2] = 2;	/* 0=level, 1=peak */
	return 0;
}

static int snd_echo_vumeters_get(struct snd_kcontrol *kcontrol,
				 struct snd_ctl_elem_value *ucontrol)
{
	struct echoaudio *chip;

	chip = snd_kcontrol_chip(kcontrol);
	get_audio_meters(chip, ucontrol->value.integer.value);
	return 0;
}

static struct snd_kcontrol_new snd_echo_vumeters __devinitdata = {
	.name = "VU-meters",
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.access = SNDRV_CTL_ELEM_ACCESS_READ |
		  SNDRV_CTL_ELEM_ACCESS_VOLATILE |
		  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
	.info = snd_echo_vumeters_info,
	.get = snd_echo_vumeters_get,
	.tlv = {.p = db_scale_output_gain},
};



/*** Channels info - it exports informations about the number of channels ***/
static int snd_echo_channels_info_info(struct snd_kcontrol *kcontrol,
				       struct snd_ctl_elem_info *uinfo)
{
	struct echoaudio *chip;

	chip = snd_kcontrol_chip(kcontrol);
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 6;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 1 << ECHO_CLOCK_NUMBER;
	return 0;
}

static int snd_echo_channels_info_get(struct snd_kcontrol *kcontrol,
				      struct snd_ctl_elem_value *ucontrol)
{
	struct echoaudio *chip;
	int detected, clocks, bit, src;

	chip = snd_kcontrol_chip(kcontrol);
	ucontrol->value.integer.value[0] = num_busses_in(chip);
	ucontrol->value.integer.value[1] = num_analog_busses_in(chip);
	ucontrol->value.integer.value[2] = num_busses_out(chip);
	ucontrol->value.integer.value[3] = num_analog_busses_out(chip);
	ucontrol->value.integer.value[4] = num_pipes_out(chip);

	/* Compute the bitmask of the currently valid input clocks */
	detected = detect_input_clocks(chip);
	clocks = 0;
	src = chip->num_clock_sources - 1;
	for (bit = ECHO_CLOCK_NUMBER - 1; bit >= 0; bit--)
		if (detected & (1 << bit))
			for (; src >= 0; src--)
				if (bit == chip->clock_source_list[src]) {
					clocks |= 1 << src;
					break;
				}
	ucontrol->value.integer.value[5] = clocks;

	return 0;
}

static struct snd_kcontrol_new snd_echo_channels_info __devinitdata = {
	.name = "Channels info",
	.iface = SNDRV_CTL_ELEM_IFACE_HWDEP,
	.access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
	.info = snd_echo_channels_info_info,
	.get = snd_echo_channels_info_get,
};




/******************************************************************************
	IRQ Handler
******************************************************************************/

static irqreturn_t snd_echo_interrupt(int irq, void *dev_id)
{
	struct echoaudio *chip = dev_id;
	struct snd_pcm_substream *substream;
	int period, ss, st;

	spin_lock(&chip->lock);
	st = service_irq(chip);
	if (st < 0) {
		spin_unlock(&chip->lock);
		return IRQ_NONE;
	}
	/* The hardware doesn't tell us which substream caused the irq,
	thus we have to check all running substreams. */
	for (ss = 0; ss < DSP_MAXPIPES; ss++) {
		if ((substream = chip->substream[ss])) {
			period = pcm_pointer(substream) /
				substream->runtime->period_size;
			if (period != chip->last_period[ss]) {
				chip->last_period[ss] = period;
				spin_unlock(&chip->lock);
				snd_pcm_period_elapsed(substream);
				spin_lock(&chip->lock);
			}
		}
	}
	spin_unlock(&chip->lock);

#ifdef ECHOCARD_HAS_MIDI
	if (st > 0 && chip->midi_in) {
		snd_rawmidi_receive(chip->midi_in, chip->midi_buffer, st);
		DE_MID(("rawmidi_iread=%d\n", st));
	}
#endif
	return IRQ_HANDLED;
}




/******************************************************************************
	Module construction / destruction
******************************************************************************/

static int snd_echo_free(struct echoaudio *chip)
{
	DE_INIT(("Stop DSP...\n"));
	if (chip->comm_page) {
		rest_in_peace(chip);
		snd_dma_free_pages(&chip->commpage_dma_buf);
	}
	DE_INIT(("Stopped.\n"));

	if (chip->irq >= 0)
		free_irq(chip->irq, chip);

	if (chip->dsp_registers)
		iounmap(chip->dsp_registers);

	if (chip->iores)
		release_and_free_resource(chip->iores);

	DE_INIT(("MMIO freed.\n"));

	pci_disable_device(chip->pci);

	/* release chip data */
	kfree(chip);
	DE_INIT(("Chip freed.\n"));
	return 0;
}



static int snd_echo_dev_free(struct snd_device *device)
{
	struct echoaudio *chip = device->device_data;

	DE_INIT(("snd_echo_dev_free()...\n"));
	return snd_echo_free(chip);
}



/* <--snd_echo_probe() */
static __devinit int snd_echo_create(struct snd_card *card,
				     struct pci_dev *pci,
				     struct echoaudio **rchip)
{
	struct echoaudio *chip;
	int err;
	size_t sz;
	static struct snd_device_ops ops = {
		.dev_free = snd_echo_dev_free,
	};

	*rchip = NULL;

	pci_write_config_byte(pci, PCI_LATENCY_TIMER, 0xC0);

	if ((err = pci_enable_device(pci)) < 0)
		return err;
	pci_set_master(pci);

	/* allocate a chip-specific data */
	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (!chip) {
		pci_disable_device(pci);
		return -ENOMEM;
	}
	DE_INIT(("chip=%p\n", chip));

	spin_lock_init(&chip->lock);
	chip->card = card;
	chip->pci = pci;
	chip->irq = -1;

	/* PCI resource allocation */
	chip->dsp_registers_phys = pci_resource_start(pci, 0);
	sz = pci_resource_len(pci, 0);
	if (sz > PAGE_SIZE)
		sz = PAGE_SIZE;		/* We map only the required part */

	if ((chip->iores = request_mem_region(chip->dsp_registers_phys, sz,
					      ECHOCARD_NAME)) == NULL) {
		snd_echo_free(chip);
		snd_printk(KERN_ERR "cannot get memory region\n");
		return -EBUSY;
	}
	chip->dsp_registers = (volatile u32 __iomem *)
		ioremap_nocache(chip->dsp_registers_phys, sz);

	if (request_irq(pci->irq, snd_echo_interrupt, IRQF_SHARED,
			ECHOCARD_NAME, chip)) {
		snd_echo_free(chip);
		snd_printk(KERN_ERR "cannot grab irq\n");
		return -EBUSY;
	}
	chip->irq = pci->irq;
	DE_INIT(("pci=%p irq=%d subdev=%04x Init hardware...\n",
		 chip->pci, chip->irq, chip->pci->subsystem_device));

	/* Create the DSP comm page - this is the area of memory used for most
	of the communication with the DSP, which accesses it via bus mastering */
	if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
				sizeof(struct comm_page),
				&chip->commpage_dma_buf) < 0) {
		snd_echo_free(chip);
		snd_printk(KERN_ERR "cannot allocate the comm page\n");
		return -ENOMEM;
	}
	chip->comm_page_phys = chip->commpage_dma_buf.addr;
	chip->comm_page = (struct comm_page *)chip->commpage_dma_buf.area;

	err = init_hw(chip, chip->pci->device, chip->pci->subsystem_device);
	if (err) {
		DE_INIT(("init_hw err=%d\n", err));
		snd_echo_free(chip);
		return err;
	}
	DE_INIT(("Card init OK\n"));

	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
		snd_echo_free(chip);
		return err;
	}
	atomic_set(&chip->opencount, 0);
	init_MUTEX(&chip->mode_mutex);
	chip->can_set_rate = 1;
	*rchip = chip;
	/* Init done ! */
	return 0;
}



/* constructor */
static int __devinit snd_echo_probe(struct pci_dev *pci,
				    const struct pci_device_id *pci_id)
{
	static int dev;
	struct snd_card *card;
	struct echoaudio *chip;
	char *dsp;
	int i, err;

	if (dev >= SNDRV_CARDS)
		return -ENODEV;
	if (!enable[dev]) {
		dev++;
		return -ENOENT;
	}

	DE_INIT(("Echoaudio driver starting...\n"));
	i = 0;
	card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
	if (card == NULL)
		return -ENOMEM;

	snd_card_set_dev(card, &pci->dev);

	if ((err = snd_echo_create(card, pci, &chip)) < 0) {
		snd_card_free(card);
		return err;
	}

	strcpy(card->driver, "Echo_" ECHOCARD_NAME);
	strcpy(card->shortname, chip->card_name);

	dsp = "56301";
	if (pci_id->device == 0x3410)
		dsp = "56361";

	sprintf(card->longname, "%s rev.%d (DSP%s) at 0x%lx irq %i",
		card->shortname, pci_id->subdevice & 0x000f, dsp,
		chip->dsp_registers_phys, chip->irq);

	if ((err = snd_echo_new_pcm(chip)) < 0) {
		snd_printk(KERN_ERR "new pcm error %d\n", err);
		snd_card_free(card);
		return err;
	}

#ifdef ECHOCARD_HAS_MIDI
	if (chip->has_midi) {	/* Some Mia's do not have midi */
		if ((err = snd_echo_midi_create(card, chip)) < 0) {
			snd_printk(KERN_ERR "new midi error %d\n", err);
			snd_card_free(card);
			return err;
		}
	}
#endif

#ifdef ECHOCARD_HAS_VMIXER
	snd_echo_vmixer.count = num_pipes_out(chip) * num_busses_out(chip);
	if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_line_output_gain, chip))) < 0)
		goto ctl_error;
	if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_vmixer, chip))) < 0)
		goto ctl_error;
#else
	if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_pcm_output_gain, chip))) < 0)
		goto ctl_error;
#endif

#ifdef ECHOCARD_HAS_INPUT_GAIN
	if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_line_input_gain, chip))) < 0)
		goto ctl_error;
#endif

#ifdef ECHOCARD_HAS_INPUT_NOMINAL_LEVEL
	if (!chip->hasnt_input_nominal_level)
		if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_intput_nominal_level, chip))) < 0)
			goto ctl_error;
#endif

#ifdef ECHOCARD_HAS_OUTPUT_NOMINAL_LEVEL
	if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_output_nominal_level, chip))) < 0)
		goto ctl_error;
#endif

	if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_vumeters_switch, chip))) < 0)
		goto ctl_error;

	if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_vumeters, chip))) < 0)
		goto ctl_error;

#ifdef ECHOCARD_HAS_MONITOR
	snd_echo_monitor_mixer.count = num_busses_in(chip) * num_busses_out(chip);
	if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_monitor_mixer, chip))) < 0)
		goto ctl_error;
#endif

#ifdef ECHOCARD_HAS_DIGITAL_IN_AUTOMUTE
	if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_automute_switch, chip))) < 0)
		goto ctl_error;
#endif

	if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_channels_info, chip))) < 0)
		goto ctl_error;

#ifdef ECHOCARD_HAS_DIGITAL_MODE_SWITCH
	/* Creates a list of available digital modes */
	chip->num_digital_modes = 0;
	for (i = 0; i < 6; i++)
		if (chip->digital_modes & (1 << i))
			chip->digital_mode_list[chip->num_digital_modes++] = i;

	if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_digital_mode_switch, chip))) < 0)
		goto ctl_error;
#endif /* ECHOCARD_HAS_DIGITAL_MODE_SWITCH */

#ifdef ECHOCARD_HAS_EXTERNAL_CLOCK
	/* Creates a list of available clock sources */
	chip->num_clock_sources = 0;
	for (i = 0; i < 10; i++)
		if (chip->input_clock_types & (1 << i))
			chip->clock_source_list[chip->num_clock_sources++] = i;

	if (chip->num_clock_sources > 1) {
		chip->clock_src_ctl = snd_ctl_new1(&snd_echo_clock_source_switch, chip);
		if ((err = snd_ctl_add(chip->card, chip->clock_src_ctl)) < 0)
			goto ctl_error;
	}
#endif /* ECHOCARD_HAS_EXTERNAL_CLOCK */

#ifdef ECHOCARD_HAS_DIGITAL_IO
	if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_spdif_mode_switch, chip))) < 0)
		goto ctl_error;
#endif

#ifdef ECHOCARD_HAS_PHANTOM_POWER
	if (chip->has_phantom_power)
		if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_echo_phantom_power_switch, chip))) < 0)
			goto ctl_error;
#endif

	if ((err = snd_card_register(card)) < 0) {
		snd_card_free(card);
		goto ctl_error;
	}
	snd_printk(KERN_INFO "Card registered: %s\n", card->longname);

	pci_set_drvdata(pci, chip);
	dev++;
	return 0;

ctl_error:
	snd_printk(KERN_ERR "new control error %d\n", err);
	snd_card_free(card);
	return err;
}



static void __devexit snd_echo_remove(struct pci_dev *pci)
{
	struct echoaudio *chip;

	chip = pci_get_drvdata(pci);
	if (chip)
		snd_card_free(chip->card);
	pci_set_drvdata(pci, NULL);
}



/******************************************************************************
	Everything starts and ends here
******************************************************************************/

/* pci_driver definition */
static struct pci_driver driver = {
	.name = "Echoaudio " ECHOCARD_NAME,
	.id_table = snd_echo_ids,
	.probe = snd_echo_probe,
	.remove = __devexit_p(snd_echo_remove),
};



/* initialization of the module */
static int __init alsa_card_echo_init(void)
{
	return pci_register_driver(&driver);
}



/* clean up the module */
static void __exit alsa_card_echo_exit(void)
{
	pci_unregister_driver(&driver);
}


module_init(alsa_card_echo_init)
module_exit(alsa_card_echo_exit)