[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / usb / endpoint.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/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>

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

#include "usbaudio.h"
#include "card.h"
#include "proc.h"
#include "quirks.h"
#include "endpoint.h"
#include "urb.h"
#include "pcm.h"
#include "helper.h"
#include "format.h"

/*
 * free a substream
 */
static void free_substream(struct snd_usb_substream *subs)
{
	struct list_head *p, *n;

	if (!subs->num_formats)
		return; /* not initialized */
	list_for_each_safe(p, n, &subs->fmt_list) {
		struct audioformat *fp = list_entry(p, struct audioformat, list);
		kfree(fp->rate_table);
		kfree(fp);
	}
	kfree(subs->rate_list.list);
}


/*
 * free a usb stream instance
 */
static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
{
	free_substream(&stream->substream[0]);
	free_substream(&stream->substream[1]);
	list_del(&stream->list);
	kfree(stream);
}

static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
{
	struct snd_usb_stream *stream = pcm->private_data;
	if (stream) {
		stream->pcm = NULL;
		snd_usb_audio_stream_free(stream);
	}
}


/*
 * add this endpoint to the chip instance.
 * if a stream with the same endpoint already exists, append to it.
 * if not, create a new pcm stream.
 */
int snd_usb_add_audio_endpoint(struct snd_usb_audio *chip, int stream, struct audioformat *fp)
{
	struct list_head *p;
	struct snd_usb_stream *as;
	struct snd_usb_substream *subs;
	struct snd_pcm *pcm;
	int err;

	list_for_each(p, &chip->pcm_list) {
		as = list_entry(p, struct snd_usb_stream, list);
		if (as->fmt_type != fp->fmt_type)
			continue;
		subs = &as->substream[stream];
		if (!subs->endpoint)
			continue;
		if (subs->endpoint == fp->endpoint) {
			list_add_tail(&fp->list, &subs->fmt_list);
			subs->num_formats++;
			subs->formats |= fp->formats;
			return 0;
		}
	}
	/* look for an empty stream */
	list_for_each(p, &chip->pcm_list) {
		as = list_entry(p, struct snd_usb_stream, list);
		if (as->fmt_type != fp->fmt_type)
			continue;
		subs = &as->substream[stream];
		if (subs->endpoint)
			continue;
		err = snd_pcm_new_stream(as->pcm, stream, 1);
		if (err < 0)
			return err;
		snd_usb_init_substream(as, stream, fp);
		return 0;
	}

	/* create a new pcm */
	as = kzalloc(sizeof(*as), GFP_KERNEL);
	if (!as)
		return -ENOMEM;
	as->pcm_index = chip->pcm_devs;
	as->chip = chip;
	as->fmt_type = fp->fmt_type;
	err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
			  stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
			  stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
			  &pcm);
	if (err < 0) {
		kfree(as);
		return err;
	}
	as->pcm = pcm;
	pcm->private_data = as;
	pcm->private_free = snd_usb_audio_pcm_free;
	pcm->info_flags = 0;
	if (chip->pcm_devs > 0)
		sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
	else
		strcpy(pcm->name, "USB Audio");

	snd_usb_init_substream(as, stream, fp);

	list_add(&as->list, &chip->pcm_list);
	chip->pcm_devs++;

	snd_usb_proc_pcm_format_add(as);

	return 0;
}

int snd_usb_parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
{
	struct usb_device *dev;
	struct usb_interface *iface;
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	int i, altno, err, stream;
	int format = 0, num_channels = 0;
	struct audioformat *fp = NULL;
	unsigned char *fmt, *csep;
	int num, protocol;

	dev = chip->dev;

	/* parse the interface's altsettings */
	iface = usb_ifnum_to_if(dev, iface_no);

	num = iface->num_altsetting;

	/*
	 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
	 * one misses syncpipe, and does not produce any sound.
	 */
	if (chip->usb_id == USB_ID(0x04fa, 0x4201))
		num = 4;

	for (i = 0; i < num; i++) {
		alts = &iface->altsetting[i];
		altsd = get_iface_desc(alts);
		protocol = altsd->bInterfaceProtocol;
		/* skip invalid one */
		if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
		     altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
		    (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
		     altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC) ||
		    altsd->bNumEndpoints < 1 ||
		    le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
			continue;
		/* must be isochronous */
		if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
		    USB_ENDPOINT_XFER_ISOC)
			continue;
		/* check direction */
		stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
			SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
		altno = altsd->bAlternateSetting;

		if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
			continue;

		/* get audio formats */
		switch (protocol) {
		case UAC_VERSION_1: {
			struct uac_as_header_descriptor_v1 *as =
				snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);

			if (!as) {
				snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
					   dev->devnum, iface_no, altno);
				continue;
			}

			if (as->bLength < sizeof(*as)) {
				snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
					   dev->devnum, iface_no, altno);
				continue;
			}

			format = le16_to_cpu(as->wFormatTag); /* remember the format value */
			break;
		}

		case UAC_VERSION_2: {
			struct uac_as_header_descriptor_v2 *as =
				snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);

			if (!as) {
				snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
					   dev->devnum, iface_no, altno);
				continue;
			}

			if (as->bLength < sizeof(*as)) {
				snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
					   dev->devnum, iface_no, altno);
				continue;
			}

			num_channels = as->bNrChannels;
			format = le32_to_cpu(as->bmFormats);

			break;
		}

		default:
			snd_printk(KERN_ERR "%d:%u:%d : unknown interface protocol %04x\n",
				   dev->devnum, iface_no, altno, protocol);
			continue;
		}

		/* get format type */
		fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_FORMAT_TYPE);
		if (!fmt) {
			snd_printk(KERN_ERR "%d:%u:%d : no UAC_FORMAT_TYPE desc\n",
				   dev->devnum, iface_no, altno);
			continue;
		}
		if (((protocol == UAC_VERSION_1) && (fmt[0] < 8)) ||
		    ((protocol == UAC_VERSION_2) && (fmt[0] != 6))) {
			snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
				   dev->devnum, iface_no, altno);
			continue;
		}

		/*
		 * Blue Microphones workaround: The last altsetting is identical
		 * with the previous one, except for a larger packet size, but
		 * is actually a mislabeled two-channel setting; ignore it.
		 */
		if (fmt[4] == 1 && fmt[5] == 2 && altno == 2 && num == 3 &&
		    fp && fp->altsetting == 1 && fp->channels == 1 &&
		    fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
		    protocol == UAC_VERSION_1 &&
		    le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
							fp->maxpacksize * 2)
			continue;

		csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
		/* Creamware Noah has this descriptor after the 2nd endpoint */
		if (!csep && altsd->bNumEndpoints >= 2)
			csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
		if (!csep || csep[0] < 7 || csep[2] != UAC_EP_GENERAL) {
			snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"
				   " class specific endpoint descriptor\n",
				   dev->devnum, iface_no, altno);
			csep = NULL;
		}

		fp = kzalloc(sizeof(*fp), GFP_KERNEL);
		if (! fp) {
			snd_printk(KERN_ERR "cannot malloc\n");
			return -ENOMEM;
		}

		fp->iface = iface_no;
		fp->altsetting = altno;
		fp->altset_idx = i;
		fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
		fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
		fp->datainterval = snd_usb_parse_datainterval(chip, alts);
		fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
		/* num_channels is only set for v2 interfaces */
		fp->channels = num_channels;
		if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
			fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
					* (fp->maxpacksize & 0x7ff);
		fp->attributes = csep ? csep[3] : 0;

		/* some quirks for attributes here */

		switch (chip->usb_id) {
		case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
			/* Optoplay sets the sample rate attribute although
			 * it seems not supporting it in fact.
			 */
			fp->attributes &= ~UAC_EP_CS_ATTR_SAMPLE_RATE;
			break;
		case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
		case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
			/* doesn't set the sample rate attribute, but supports it */
			fp->attributes |= UAC_EP_CS_ATTR_SAMPLE_RATE;
			break;
		case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
		case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
						an older model 77d:223) */
		/*
		 * plantronics headset and Griffin iMic have set adaptive-in
		 * although it's really not...
		 */
			fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
			if (stream == SNDRV_PCM_STREAM_PLAYBACK)
				fp->ep_attr |= USB_ENDPOINT_SYNC_ADAPTIVE;
			else
				fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
			break;
		}

		/* ok, let's parse further... */
		if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream, alts) < 0) {
			kfree(fp->rate_table);
			kfree(fp);
			continue;
		}

		snd_printdd(KERN_INFO "%d:%u:%d: add audio endpoint %#x\n", dev->devnum, iface_no, altno, fp->endpoint);
		err = snd_usb_add_audio_endpoint(chip, stream, fp);
		if (err < 0) {
			kfree(fp->rate_table);
			kfree(fp);
			return err;
		}
		/* try to set the interface... */
		usb_set_interface(chip->dev, iface_no, altno);
		snd_usb_init_pitch(chip, iface_no, alts, fp);
		snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
	}
	return 0;
}
Commit	Line	Data
e5779998 DM	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License as published by
	4	* the Free Software Foundation; either version 2 of the License, or
	5	* (at your option) any later version.
	6	*
	7	* This program is distributed in the hope that it will be useful,
	8	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	9	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	10	* GNU General Public License for more details.
	11	*
	12	* You should have received a copy of the GNU General Public License
	13	* along with this program; if not, write to the Free Software
	14	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	15	*
	16	*/
	17
	18	#include <linux/init.h>
	19	#include <linux/usb.h>
	20	#include <linux/usb/audio.h>
7e847894	21	#include <linux/usb/audio-v2.h>
e5779998 DM	22
	23	#include <sound/core.h>
	24	#include <sound/pcm.h>
	25
	26	#include "usbaudio.h"
	27	#include "card.h"
	28	#include "proc.h"
	29	#include "quirks.h"
	30	#include "endpoint.h"
	31	#include "urb.h"
	32	#include "pcm.h"
	33	#include "helper.h"
	34	#include "format.h"
	35
	36	/*
	37	* free a substream
	38	*/
	39	static void free_substream(struct snd_usb_substream *subs)
	40	{
	41	struct list_head p, n;
	42
	43	if (!subs->num_formats)
	44	return; /* not initialized */
	45	list_for_each_safe(p, n, &subs->fmt_list) {
	46	struct audioformat *fp = list_entry(p, struct audioformat, list);
	47	kfree(fp->rate_table);
	48	kfree(fp);
	49	}
	50	kfree(subs->rate_list.list);
	51	}
	52
	53
	54	/*
	55	* free a usb stream instance
	56	*/
	57	static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
	58	{
	59	free_substream(&stream->substream[0]);
	60	free_substream(&stream->substream[1]);
	61	list_del(&stream->list);
	62	kfree(stream);
	63	}
	64
	65	static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
	66	{
	67	struct snd_usb_stream *stream = pcm->private_data;
	68	if (stream) {
	69	stream->pcm = NULL;
	70	snd_usb_audio_stream_free(stream);
	71	}
	72	}
	73
	74
	75	/*
	76	* add this endpoint to the chip instance.
	77	* if a stream with the same endpoint already exists, append to it.
	78	* if not, create a new pcm stream.
	79	*/
	80	int snd_usb_add_audio_endpoint(struct snd_usb_audio chip, int stream, struct audioformat fp)
	81	{
	82	struct list_head *p;
	83	struct snd_usb_stream *as;
	84	struct snd_usb_substream *subs;
	85	struct snd_pcm *pcm;
86	int err;
87
88	list_for_each(p, &chip->pcm_list) {
89	as = list_entry(p, struct snd_usb_stream, list);
90	if (as->fmt_type != fp->fmt_type)
91	continue;
92	subs = &as->substream[stream];
93	if (!subs->endpoint)
94	continue;
95	if (subs->endpoint == fp->endpoint) {
96	list_add_tail(&fp->list, &subs->fmt_list);
97	subs->num_formats++;
015eb0b0	98	subs->formats \|= fp->formats;
e5779998 DM	99	return 0;
	100	}
	101	}
	102	/* look for an empty stream */
	103	list_for_each(p, &chip->pcm_list) {
	104	as = list_entry(p, struct snd_usb_stream, list);
	105	if (as->fmt_type != fp->fmt_type)
	106	continue;
	107	subs = &as->substream[stream];
	108	if (subs->endpoint)
	109	continue;
	110	err = snd_pcm_new_stream(as->pcm, stream, 1);
	111	if (err < 0)
	112	return err;
	113	snd_usb_init_substream(as, stream, fp);
	114	return 0;
	115	}
	116
	117	/* create a new pcm */
	118	as = kzalloc(sizeof(*as), GFP_KERNEL);
	119	if (!as)
	120	return -ENOMEM;
	121	as->pcm_index = chip->pcm_devs;
	122	as->chip = chip;
	123	as->fmt_type = fp->fmt_type;
	124	err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
	125	stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
	126	stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
	127	&pcm);
	128	if (err < 0) {
	129	kfree(as);
	130	return err;
	131	}
	132	as->pcm = pcm;
	133	pcm->private_data = as;
	134	pcm->private_free = snd_usb_audio_pcm_free;
	135	pcm->info_flags = 0;
	136	if (chip->pcm_devs > 0)
	137	sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
	138	else
	139	strcpy(pcm->name, "USB Audio");
	140
	141	snd_usb_init_substream(as, stream, fp);
	142
	143	list_add(&as->list, &chip->pcm_list);
	144	chip->pcm_devs++;
	145
	146	snd_usb_proc_pcm_format_add(as);
	147
	148	return 0;
	149	}
	150
	151	int snd_usb_parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
	152	{
	153	struct usb_device *dev;
	154	struct usb_interface *iface;
	155	struct usb_host_interface *alts;
	156	struct usb_interface_descriptor *altsd;
	157	int i, altno, err, stream;
	158	int format = 0, num_channels = 0;
	159	struct audioformat *fp = NULL;
	160	unsigned char fmt, csep;
	161	int num, protocol;
	162
163	dev = chip->dev;
164
165	/* parse the interface's altsettings */
166	iface = usb_ifnum_to_if(dev, iface_no);
167
168	num = iface->num_altsetting;
169
170	/*
171	* Dallas DS4201 workaround: It presents 5 altsettings, but the last
172	* one misses syncpipe, and does not produce any sound.
173	*/
174	if (chip->usb_id == USB_ID(0x04fa, 0x4201))
175	num = 4;
176
177	for (i = 0; i < num; i++) {
178	alts = &iface->altsetting[i];
179	altsd = get_iface_desc(alts);
180	protocol = altsd->bInterfaceProtocol;
181	/* skip invalid one */
182	if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
183	altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) \|\|
184	(altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
185	altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC) \|\|
186	altsd->bNumEndpoints < 1 \|\|
187	le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
188	continue;
189	/* must be isochronous */
190	if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
191	USB_ENDPOINT_XFER_ISOC)
192	continue;
193	/* check direction */
194	stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
195	SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
196	altno = altsd->bAlternateSetting;
197
198	if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
199	continue;
200
201	/* get audio formats */
202	switch (protocol) {
203	case UAC_VERSION_1: {
204	struct uac_as_header_descriptor_v1 *as =
205	snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
206
207	if (!as) {
208	snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
209	dev->devnum, iface_no, altno);
210	continue;
211	}
212
213	if (as->bLength < sizeof(*as)) {
214	snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
215	dev->devnum, iface_no, altno);
216	continue;
217	}
218
219	format = le16_to_cpu(as->wFormatTag); /* remember the format value */
220	break;
221	}
222
223	case UAC_VERSION_2: {
224	struct uac_as_header_descriptor_v2 *as =
225	snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
226
227	if (!as) {
228	snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
229	dev->devnum, iface_no, altno);
230	continue;
231	}
232
233	if (as->bLength < sizeof(*as)) {
234	snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
235	dev->devnum, iface_no, altno);
236	continue;
237	}
238
239	num_channels = as->bNrChannels;
240	format = le32_to_cpu(as->bmFormats);
241
242	break;
243	}
244
245	default:
246	snd_printk(KERN_ERR "%d:%u:%d : unknown interface protocol %04x\n",
247	dev->devnum, iface_no, altno, protocol);
248	continue;
249	}
250
251	/* get format type */
252	fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_FORMAT_TYPE);
253	if (!fmt) {
254	snd_printk(KERN_ERR "%d:%u:%d : no UAC_FORMAT_TYPE desc\n",
255	dev->devnum, iface_no, altno);
256	continue;
257	}
258	if (((protocol == UAC_VERSION_1) && (fmt[0] < 8)) \|\|
259	((protocol == UAC_VERSION_2) && (fmt[0] != 6))) {
260	snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
261	dev->devnum, iface_no, altno);
262	continue;
263	}
264
265	/*
266	* Blue Microphones workaround: The last altsetting is identical
267	* with the previous one, except for a larger packet size, but
268	* is actually a mislabeled two-channel setting; ignore it.
269	*/
270	if (fmt[4] == 1 && fmt[5] == 2 && altno == 2 && num == 3 &&
271	fp && fp->altsetting == 1 && fp->channels == 1 &&
015eb0b0	272	fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
e5779998 DM	273	protocol == UAC_VERSION_1 &&
	274	le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
	275	fp->maxpacksize * 2)
	276	continue;
	277
	278	csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
	279	/* Creamware Noah has this descriptor after the 2nd endpoint */
	280	if (!csep && altsd->bNumEndpoints >= 2)
	281	csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
	282	if (!csep \|\| csep[0] < 7 \|\| csep[2] != UAC_EP_GENERAL) {
	283	snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"
	284	" class specific endpoint descriptor\n",
	285	dev->devnum, iface_no, altno);
	286	csep = NULL;
	287	}
	288
	289	fp = kzalloc(sizeof(*fp), GFP_KERNEL);
	290	if (! fp) {
	291	snd_printk(KERN_ERR "cannot malloc\n");
	292	return -ENOMEM;
	293	}
	294
	295	fp->iface = iface_no;
	296	fp->altsetting = altno;
	297	fp->altset_idx = i;
	298	fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
	299	fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
	300	fp->datainterval = snd_usb_parse_datainterval(chip, alts);
	301	fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
	302	/* num_channels is only set for v2 interfaces */
	303	fp->channels = num_channels;
	304	if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
	305	fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
	306	* (fp->maxpacksize & 0x7ff);
	307	fp->attributes = csep ? csep[3] : 0;
	308
	309	/* some quirks for attributes here */
	310
	311	switch (chip->usb_id) {
	312	case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
	313	/* Optoplay sets the sample rate attribute although
	314	* it seems not supporting it in fact.
	315	*/
	316	fp->attributes &= ~UAC_EP_CS_ATTR_SAMPLE_RATE;
	317	break;
	318	case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
	319	case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
	320	/* doesn't set the sample rate attribute, but supports it */
	321	fp->attributes \|= UAC_EP_CS_ATTR_SAMPLE_RATE;
	322	break;
	323	case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
	324	case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
	325	an older model 77d:223) */
	326	/*
	327	* plantronics headset and Griffin iMic have set adaptive-in
	328	* although it's really not...
	329	*/
	330	fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
	331	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
	332	fp->ep_attr \|= USB_ENDPOINT_SYNC_ADAPTIVE;
	333	else
	334	fp->ep_attr \|= USB_ENDPOINT_SYNC_SYNC;
	335	break;
	336	}
337
338	/* ok, let's parse further... */
339	if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream, alts) < 0) {
340	kfree(fp->rate_table);
341	kfree(fp);
342	continue;
343	}
344
345	snd_printdd(KERN_INFO "%d:%u:%d: add audio endpoint %#x\n", dev->devnum, iface_no, altno, fp->endpoint);
346	err = snd_usb_add_audio_endpoint(chip, stream, fp);
347	if (err < 0) {
348	kfree(fp->rate_table);
349	kfree(fp);
350	return err;
351	}
352	/* try to set the interface... */
353	usb_set_interface(chip->dev, iface_no, altno);
767d75ad DM	354	snd_usb_init_pitch(chip, iface_no, alts, fp);
767d75ad DM	355	snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
e5779998 DM	356	}
	357	return 0;
	358	}
	359