path: root/sound/usb/quirks.c

/*
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/midi.h>

#include <sound/control.h>
#include <sound/core.h>
#include <sound/info.h>
#include <sound/pcm.h>

#include "usbaudio.h"
#include "card.h"
#include "mixer.h"
#include "mixer_quirks.h"
#include "midi.h"
#include "quirks.h"
#include "helper.h"
#include "endpoint.h"
#include "pcm.h"
#include "clock.h"
#include "stream.h"

/*
 * handle the quirks for the contained interfaces
 */
static int create_composite_quirk(struct snd_usb_audio *chip,
				  struct usb_interface *iface,
				  struct usb_driver *driver,
				  const struct snd_usb_audio_quirk *quirk_comp)
{
	int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
	const struct snd_usb_audio_quirk *quirk;
	int err;

	for (quirk = quirk_comp->data; quirk->ifnum >= 0; ++quirk) {
		iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
		if (!iface)
			continue;
		if (quirk->ifnum != probed_ifnum &&
		    usb_interface_claimed(iface))
			continue;
		err = snd_usb_create_quirk(chip, iface, driver, quirk);
		if (err < 0)
			return err;
	}

	for (quirk = quirk_comp->data; quirk->ifnum >= 0; ++quirk) {
		iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
		if (!iface)
			continue;
		if (quirk->ifnum != probed_ifnum &&
		    !usb_interface_claimed(iface)) {
			err = usb_driver_claim_interface(driver, iface,
							 USB_AUDIO_IFACE_UNUSED);
			if (err < 0)
				return err;
		}
	}

	return 0;
}

static int ignore_interface_quirk(struct snd_usb_audio *chip,
				  struct usb_interface *iface,
				  struct usb_driver *driver,
				  const struct snd_usb_audio_quirk *quirk)
{
	return 0;
}


/*
 * Allow alignment on audio sub-slot (channel samples) rather than
 * on audio slots (audio frames)
 */
static int create_align_transfer_quirk(struct snd_usb_audio *chip,
				       struct usb_interface *iface,
				       struct usb_driver *driver,
				       const struct snd_usb_audio_quirk *quirk)
{
	chip->txfr_quirk = 1;
	return 1;	/* Continue with creating streams and mixer */
}

static int create_any_midi_quirk(struct snd_usb_audio *chip,
				 struct usb_interface *intf,
				 struct usb_driver *driver,
				 const struct snd_usb_audio_quirk *quirk)
{
	return snd_usbmidi_create(chip->card, intf, &chip->midi_list, quirk);
}

/*
 * create a stream for an interface with proper descriptors
 */
static int create_standard_audio_quirk(struct snd_usb_audio *chip,
				       struct usb_interface *iface,
				       struct usb_driver *driver,
				       const struct snd_usb_audio_quirk *quirk)
{
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	int err;

	if (chip->usb_id == USB_ID(0x1686, 0x00dd)) /* Zoom R16/24 */
		chip->tx_length_quirk = 1;

	alts = &iface->altsetting[0];
	altsd = get_iface_desc(alts);
	err = snd_usb_parse_audio_interface(chip, altsd->bInterfaceNumber);
	if (err < 0) {
		usb_audio_err(chip, "cannot setup if %d: error %d\n",
			   altsd->bInterfaceNumber, err);
		return err;
	}
	/* reset the current interface */
	usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
	return 0;
}

/*
 * create a stream for an endpoint/altsetting without proper descriptors
 */
static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
				     struct usb_interface *iface,
				     struct usb_driver *driver,
				     const struct snd_usb_audio_quirk *quirk)
{
	struct audioformat *fp;
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	int stream, err;
	unsigned *rate_table = NULL;

	fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
	if (!fp)
		return -ENOMEM;

	INIT_LIST_HEAD(&fp->list);
	if (fp->nr_rates > MAX_NR_RATES) {
		kfree(fp);
		return -EINVAL;
	}
	if (fp->nr_rates > 0) {
		rate_table = kmemdup(fp->rate_table,
				     sizeof(int) * fp->nr_rates, GFP_KERNEL);
		if (!rate_table) {
			kfree(fp);
			return -ENOMEM;
		}
		fp->rate_table = rate_table;
	}

	stream = (fp->endpoint & USB_DIR_IN)
		? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
	err = snd_usb_add_audio_stream(chip, stream, fp);
	if (err < 0)
		goto error;
	if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
	    fp->altset_idx >= iface->num_altsetting) {
		err = -EINVAL;
		goto error;
	}
	alts = &iface->altsetting[fp->altset_idx];
	altsd = get_iface_desc(alts);
	if (altsd->bNumEndpoints < 1) {
		err = -EINVAL;
		goto error;
	}

	fp->protocol = altsd->bInterfaceProtocol;

	if (fp->datainterval == 0)
		fp->datainterval = snd_usb_parse_datainterval(chip, alts);
	if (fp->maxpacksize == 0)
		fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
	usb_set_interface(chip->dev, fp->iface, 0);
	snd_usb_init_pitch(chip, fp->iface, alts, fp);
	snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
	return 0;

 error:
	list_del(&fp->list); /* unlink for avoiding double-free */
	kfree(fp);
	kfree(rate_table);
	return err;
}

static int create_auto_pcm_quirk(struct snd_usb_audio *chip,
				 struct usb_interface *iface,
				 struct usb_driver *driver)
{
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	struct usb_endpoint_descriptor *epd;
	struct uac1_as_header_descriptor *ashd;
	struct uac_format_type_i_discrete_descriptor *fmtd;

	/*
	 * Most Roland/Yamaha audio streaming interfaces have more or less
	 * standard descriptors, but older devices might lack descriptors, and
	 * future ones might change, so ensure that we fail silently if the
	 * interface doesn't look exactly right.
	 */

	/* must have a non-zero altsetting for streaming */
	if (iface->num_