sscape.c

Linux Kernel 2.6.9 for OMAP1710

	int err;

#define CS4231_SHARE_HARDWARE  (CS4231_HWSHARE_DMA1 | CS4231_HWSHARE_DMA2)
	/*
	 * The AD1845 PCM device is only half-duplex, and so
	 * we only give it one DMA channel ...
	 */
	if ((err = snd_cs4231_create(card,
				     port, -1, irq, dma1, dma1,
				     CS4231_HW_DETECT,
				     CS4231_HWSHARE_DMA1, &chip)) == 0) {
		unsigned long flags;
		snd_pcm_t *pcm;

#define AD1845_FREQ_SEL_ENABLE  0x08

#define AD1845_PWR_DOWN_CTRL   0x1b
#define AD1845_CRYS_CLOCK_SEL  0x1d

/*
 * It turns out that the PLAYBACK_ENABLE bit is set
 * by the lowlevel driver ...
 *
#define AD1845_IFACE_CONFIG  \
           (CS4231_AUTOCALIB | CS4231_RECORD_ENABLE | CS4231_PLAYBACK_ENABLE)
    snd_cs4231_mce_up(chip);
    spin_lock_irqsave(&chip->reg_lock, flags);
    snd_cs4231_out(chip, CS4231_IFACE_CTRL, AD1845_IFACE_CONFIG);
    spin_unlock_irqrestore(&chip->reg_lock, flags);
    snd_cs4231_mce_down(chip);
 */

		/*
		 * The input clock frequency on the SoundScape must
		 * be 14.31818 MHz, because we must set this register
		 * to get the playback to sound correct ...
		 */
		snd_cs4231_mce_up(chip);
		spin_lock_irqsave(&chip->reg_lock, flags);
		snd_cs4231_out(chip, AD1845_CRYS_CLOCK_SEL, 0x20);
		spin_unlock_irqrestore(&chip->reg_lock, flags);
		snd_cs4231_mce_down(chip);

		/*
		 * More custom configuration:
		 * a) select "mode 2", and provide a current drive of 8 mA
		 * b) enable frequency selection (for capture/playback)
		 */
		spin_lock_irqsave(&chip->reg_lock, flags);
		snd_cs4231_out(chip, CS4231_MISC_INFO, (CS4231_MODE2 | 0x10));
		snd_cs4231_out(chip, AD1845_PWR_DOWN_CTRL, snd_cs4231_in(chip, AD1845_PWR_DOWN_CTRL) | AD1845_FREQ_SEL_ENABLE);
		spin_unlock_irqrestore(&chip->reg_lock, flags);

		if ((err = snd_cs4231_pcm(chip, 0, &pcm)) < 0) {
			snd_printk(KERN_ERR "sscape: No PCM device for AD1845 chip\n");
			goto _error;
		}

		if ((err = snd_cs4231_mixer(chip)) < 0) {
			snd_printk(KERN_ERR "sscape: No mixer device for AD1845 chip\n");
			goto _error;
		}

		if ((err = snd_ctl_add(card, snd_ctl_new1(&midi_mixer_ctl, chip))) < 0) {
			snd_printk(KERN_ERR "sscape: Could not create MIDI mixer control\n");
			goto _error;
		}

		strcpy(card->driver, "SoundScape");
		strcpy(card->shortname, pcm->name);
		snprintf(card->longname, sizeof(card->longname),
		         "%s at 0x%lx, IRQ %d, DMA %d\n",
		         pcm->name, chip->port, chip->irq, chip->dma1);
		chip->set_playback_format = ad1845_playback_format;
		chip->set_capture_format = ad1845_capture_format;
		sscape->chip = chip;
	}

	_error:
	return err;
}


struct params
{
	int index;
	const char *id;
	unsigned port;
	int irq;
	int mpu_irq;
	int dma1;
};


static inline struct params*
init_params(struct params *params,
            int index,
            const char *id,
            unsigned port,
            int irq,
            int mpu_irq,
            int dma1)
{
	params->index = index;
	params->id = id;
	params->port = port;
	params->irq = irq;
	params->mpu_irq = mpu_irq;  
	params->dma1 = (dma1 & 0x03);

	return params;
}


/*
 * Create an ALSA soundcard entry for the SoundScape, using
 * the given list of port, IRQ and DMA resources.
 */
static int __devinit create_sscape(const struct params *params, snd_card_t **rcardp)
{
	snd_card_t *card;
	register struct soundscape *sscape;
	register unsigned dma_cfg;
	unsigned irq_cfg;
	unsigned mpu_irq_cfg;
	struct resource *io_res;
	unsigned long flags;
	int err;

	/*
	 * Check that the user didn't pass us garbage data ...
	 */
	irq_cfg = get_irq_config(params->irq);
	if (irq_cfg == INVALID_IRQ) {
		snd_printk(KERN_ERR "sscape: Invalid IRQ %d\n", params->irq);
		return -ENXIO;
	}

	mpu_irq_cfg = get_irq_config(params->mpu_irq);
	if (mpu_irq_cfg == INVALID_IRQ) {
		printk(KERN_ERR "sscape: Invalid IRQ %d\n", params->mpu_irq);
		return -ENXIO;
	}

	/*
	 * Grab IO ports that we will need to probe so that we
	 * can detect and control this hardware ...
	 */
	if ((io_res = request_region(params->port, 8, "SoundScape")) == NULL) {
		snd_printk(KERN_ERR "sscape: can't grab port 0x%x\n", params->port);
		return -EBUSY;
	}

	/*
	 * Grab both DMA channels (OK, only one for now) ...
	 */
	if ((err = request_dma(params->dma1, "SoundScape")) < 0) {
		snd_printk(KERN_ERR "sscape: can't grab DMA %d\n", params->dma1);
		goto _release_region;
	}

	/*
	 * Create a new ALSA sound card entry, in anticipation
	 * of detecting our hardware ...
	 */
	if ((card = snd_card_new(params->index, params->id, THIS_MODULE, sizeof(struct soundscape))) == NULL) {
		err = -ENOMEM;
		goto _release_dma;
	}

	sscape = get_card_soundscape(card);
	spin_lock_init(&sscape->lock);
	spin_lock_init(&sscape->fwlock);
	sscape->io_res = io_res;
	sscape->io_base = params->port;

	if (!detect_sscape(sscape)) {
		printk(KERN_ERR "sscape: hardware not detected at 0x%x\n", sscape->io_base);
		err = -ENODEV;
		goto _release_card;
	}

	printk(KERN_INFO "sscape: hardware detected at 0x%x, using IRQ %d, DMA %d\n",
	                 sscape->io_base, params->irq, params->dma1);

	/*
	 * Now create the hardware-specific device so that we can
	 * load the microcode into the on-board processor.
	 * We cannot use the MPU-401 MIDI system until this firmware
	 * has been loaded into the card.
	 */
	if ((err = snd_hwdep_new(card, "MC68EC000", 0, &(sscape->hw))) < 0) {
		printk(KERN_ERR "sscape: Failed to create firmware device\n");
		goto _release_card;
	}
	strlcpy(sscape->hw->name, "SoundScape M68K", sizeof(sscape->hw->name));
	sscape->hw->name[sizeof(sscape->hw->name) - 1] = '\0';
	sscape->hw->iface = SNDRV_HWDEP_IFACE_SSCAPE;
	sscape->hw->ops.open = sscape_hw_open;
	sscape->hw->ops.release = sscape_hw_release;
	sscape->hw->ops.ioctl = sscape_hw_ioctl;
	sscape->hw->private_data = sscape;

	/*
	 * Tell the on-board devices where their resources are (I think -
	 * I can't be sure without a datasheet ... So many magic values!)
	 */
	spin_lock_irqsave(&sscape->lock, flags);

	activate_ad1845_unsafe(sscape->io_base);

	sscape_write_unsafe(sscape->io_base, GA_INTENA_REG, 0x00); /* disable */
	sscape_write_unsafe(sscape->io_base, GA_SMCFGA_REG, 0x2e);
	sscape_write_unsafe(sscape->io_base, GA_SMCFGB_REG, 0x00);

	/*
	 * Enable and configure the DMA channels ...
	 */
	sscape_write_unsafe(sscape->io_base, GA_DMACFG_REG, 0x50);
	dma_cfg = (sscape->ic_type == IC_ODIE ? 0x70 : 0x40);
	sscape_write_unsafe(sscape->io_base, GA_DMAA_REG, dma_cfg);
	sscape_write_unsafe(sscape->io_base, GA_DMAB_REG, 0x20);

	sscape_write_unsafe(sscape->io_base,
	                    GA_INTCFG_REG, 0xf0 | (mpu_irq_cfg << 2) | mpu_irq_cfg);
	sscape_write_unsafe(sscape->io_base,
	                    GA_CDCFG_REG, 0x09 | DMA_8BIT | (params->dma1 << 4) | (irq_cfg << 1));

	spin_unlock_irqrestore(&sscape->lock, flags);

	/*
	 * We have now enabled the codec chip, and so we should
	 * detect the AD1845 device ...
	 */
	if ((err = create_ad1845(card, CODEC_IO(params->port), params->irq, params->dma1)) < 0) {
		printk(KERN_ERR "sscape: No AD1845 device at 0x%x, IRQ %d\n",
		                CODEC_IO(params->port), params->irq);
		goto _release_card;
	}
#define MIDI_DEVNUM  0
	if ((err = create_mpu401(card, MIDI_DEVNUM, MPU401_IO(params->port), params->mpu_irq)) < 0) {
		printk(KERN_ERR "sscape: Failed to create MPU-401 device at 0x%x\n",
		                MPU401_IO(params->port));
		goto _release_card;
	}

	/*
	 * Enable the master IRQ ...
	 */
	sscape_write(sscape, GA_INTENA_REG, 0x80);

	if ((err = snd_card_register(card)) < 0) {
		printk(KERN_ERR "sscape: Failed to register sound card\n");
		goto _release_card;
	}

	/*
	 * Initialize mixer
	 */
	sscape->midi_vol = 0;
	host_write_ctrl_unsafe(sscape->io_base, CMD_SET_MIDI_VOL, 100);
	host_write_ctrl_unsafe(sscape->io_base, 0, 100);
	host_write_ctrl_unsafe(sscape->io_base, CMD_XXX_MIDI_VOL, 100);

	/*
	 * Now that we have successfully created this sound card,
	 * it is safe to store the pointer.
	 * NOTE: we only register the sound card's "destructor"
	 *       function now that our "constructor" has completed.
	 */
	card->private_free = soundscape_free;
	*rcardp = card;

	return 0;

	_release_card:
	snd_card_free(card);

	_release_dma:
	free_dma(params->dma1);

	_release_region:
	release_resource(io_res);
	kfree_nocheck(io_res);

	return err;
}


static int sscape_cards __devinitdata;
static struct params sscape_params[SNDRV_CARDS] __devinitdata;

#ifdef CONFIG_PNP
static inline int __devinit get_next_autoindex(int i)
{
	while ((i < SNDRV_CARDS) && (port[i] != SNDRV_AUTO_PORT)) {
		++i;
	} /* while */

	return i;
}


static inline int __devinit is_port_known(unsigned io, struct params *params, int cards)
{
	while (--cards >= 0) {
		if (params[cards].port == io)
			return 1;
	} /* while */

	return 0;
}

static int __devinit sscape_pnp_detect(struct pnp_card_link *pcard,
				       const struct pnp_card_device_id *pid)
{
	struct pnp_dev *dev;
	static int idx = 0;
	int ret;

	/*
	 * Allow this function to fail *quietly* if all the ISA PnP
	 * devices were configured using module parameters instead.
	 */
	if ((idx = get_next_autoindex(idx)) >= SNDRV_CARDS) {
		return -ENOSPC;
	}

	/*
	 * We have found a candidate ISA PnP card. Now we
	 * have to check that it has the devices that we
	 * expect it to have.
	 *
	 * We will NOT try and autoconfigure all of the resources
	 * needed and then activate the card as we are assuming that
	 * has already been done at boot-time using /proc/isapnp.
	 * We shall simply try to give each active card the resources
	 * that it wants. This is a sensible strategy for a modular
	 * system where unused modules are unloaded regularly.
	 *
	 * This strategy is utterly useless if we compile the driver
	 * into the kernel, of course.
	 */
	// printk(KERN_INFO "sscape: %s\n", card->name);

	/*
	 * Check that we still have room for another sound card ...
	 */
	if (sscape_cards >= SNDRV_CARDS) {
		printk(KERN_ERR "sscape: No room for another ALSA device\n");
		return -ENOSPC;
	}

	ret = -ENODEV;

	dev = pnp_request_card_device(pcard, pid->devs[0].id, NULL);
	if (dev) {
		struct params *this;
		if (!pnp_is_active(dev)) {
			if (pnp_activate_dev(dev) < 0) {
				printk(KERN_INFO "sscape: device is inactive\n");
				return -EBUSY;
			}
		}
		/*
		 * Read the correct parameters off the ISA PnP bus ...
		 */
		this = init_params(&sscape_params[sscape_cards],
				   index[idx],
				   id[idx],
				   pnp_port_start(dev, 0),
				   pnp_irq(dev, 0),
				   pnp_irq(dev, 1),
				   pnp_dma(dev, 0));

		/*
		 * Do we know about this sound card already?
		 */
		if ( !is_port_known(this->port, sscape_params, sscape_cards) ) {
			snd_card_t *card;

			ret = create_sscape(this, &card);
			if (ret < 0)
				return ret;
			snd_card_set_dev(card, &pcard->card->dev);
			pnp_set_card_drvdata(pcard, card);
			++sscape_cards;
			++idx;
		}
	}

	return ret;
}

static void __devexit sscape_pnp_remove(struct pnp_card_link * pcard)
{
	snd_card_t *card = (snd_card_t *) pnp_get_card_drvdata(pcard);
        
	pnp_set_card_drvdata(pcard, NULL);
	snd_card_disconnect(card);
	snd_card_free_in_thread(card);
}

static struct pnp_card_driver sscape_pnpc_driver = {
	.flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
	.name = "sscape",
	.id_table = sscape_pnpids,
	.probe = sscape_pnp_detect,
	.remove = __devexit_p(sscape_pnp_remove),
};

#endif /* CONFIG_PNP */

static int __init sscape_manual_probe(struct params *params)
{
	int ret;
	unsigned i;
	snd_card_t *card;

	for (i = 0; i < SNDRV_CARDS; ++i) {
		/*
		 * We do NOT probe for ports.
		 * If we're not given a port number for this
		 * card then we completely ignore this line
		 * of parameters.
		 */
		if (port[i] == SNDRV_AUTO_PORT)
			continue;

		/*
		 * Make sure we were given ALL of the other parameters.
		 */
		if ( (irq[i] == SNDRV_AUTO_IRQ) ||
		     (mpu_irq[i] == SNDRV_AUTO_IRQ) ||
		     (dma[i] == SNDRV_AUTO_DMA) ) {
			printk(KERN_INFO
			       "sscape: insufficient parameters, need IO, IRQ, MPU-IRQ and DMA\n");
			return -ENXIO;
		}

		/*
		 * This cards looks OK ...
		 */
		init_params(params, index[i], id[i], port[i], irq[i], mpu_irq[i], dma[i]);

		ret = create_sscape(params, &card);
		if (ret < 0)
			return ret;

		sscape_card[sscape_cards] = card;
		params++;
		sscape_cards++;
	} /* for */

	return 0;
}


static void sscape_exit(void)
{
	unsigned i;

#ifdef CONFIG_PNP
	pnp_unregister_card_driver(&sscape_pnpc_driver);
#endif
	for (i = 0; i < ARRAY_SIZE(sscape_card); ++i) {
		snd_card_free(sscape_card[i]);
	} /* for */
}


static int __init sscape_init(void)
{
	int ret;

	/*
	 * First check whether we were passed any parameters.
	 * These MUST take precedence over ANY automatic way
	 * of allocating cards, because the operator is
	 * S-P-E-L-L-I-N-G it out for us...
	 */
	ret = sscape_manual_probe(sscape_params);
	if (ret < 0) {
		int i;
		for (i = 0; i < sscape_cards; ++i)
			snd_card_free(sscape_card[i]);
		return ret;
	}

#ifdef CONFIG_PNP
	if (sscape_cards < SNDRV_CARDS) {
		ret = pnp_register_card_driver(&sscape_pnpc_driver);
		if (ret < 0) {
			sscape_exit();
			return ret;
		}
	}
#endif

	return 0;
}

module_init(sscape_init);
module_exit(sscape_exit);