[deliverable/linux.git] / sound / usb / format.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 "quirks.h"
#include "helper.h"
#include "debug.h"

/*
 * parse the audio format type I descriptor
 * and returns the corresponding pcm format
 *
 * @dev: usb device
 * @fp: audioformat record
 * @format: the format tag (wFormatTag)
 * @fmt: the format type descriptor
 */
static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
				     struct audioformat *fp,
				     int format, void *_fmt,
				     int protocol)
{
	int sample_width, sample_bytes;
	u64 pcm_formats;

	switch (protocol) {
	case UAC_VERSION_1: {
		struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
		sample_width = fmt->bBitResolution;
		sample_bytes = fmt->bSubframeSize;
		format = 1 << format;
		break;
	}

	case UAC_VERSION_2: {
		struct uac_format_type_i_ext_descriptor *fmt = _fmt;
		sample_width = fmt->bBitResolution;
		sample_bytes = fmt->bSubslotSize;
		format <<= 1;
		break;
	}

	default:
		return -EINVAL;
	}

	pcm_formats = 0;

	if (format == 0 || format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED)) {
		/* some devices don't define this correctly... */
		snd_printdd(KERN_INFO "%d:%u:%d : format type 0 is detected, processed as PCM\n",
			    chip->dev->devnum, fp->iface, fp->altsetting);
		format = 1 << UAC_FORMAT_TYPE_I_PCM;
	}
	if (format & (1 << UAC_FORMAT_TYPE_I_PCM)) {
		if (sample_width > sample_bytes * 8) {
			snd_printk(KERN_INFO "%d:%u:%d : sample bitwidth %d in over sample bytes %d\n",
				   chip->dev->devnum, fp->iface, fp->altsetting,
				   sample_width, sample_bytes);
		}
		/* check the format byte size */
		switch (sample_bytes) {
		case 1:
			pcm_formats |= SNDRV_PCM_FMTBIT_S8;
			break;
		case 2:
			if (snd_usb_is_big_endian_format(chip, fp))
				pcm_formats |= SNDRV_PCM_FMTBIT_S16_BE; /* grrr, big endian!! */
			else
				pcm_formats |= SNDRV_PCM_FMTBIT_S16_LE;
			break;
		case 3:
			if (snd_usb_is_big_endian_format(chip, fp))
				pcm_formats |= SNDRV_PCM_FMTBIT_S24_3BE; /* grrr, big endian!! */
			else
				pcm_formats |= SNDRV_PCM_FMTBIT_S24_3LE;
			break;
		case 4:
			pcm_formats |= SNDRV_PCM_FMTBIT_S32_LE;
			break;
		default:
			snd_printk(KERN_INFO "%d:%u:%d : unsupported sample bitwidth %d in %d bytes\n",
				   chip->dev->devnum, fp->iface, fp->altsetting,
				   sample_width, sample_bytes);
			break;
		}
	}
	if (format & (1 << UAC_FORMAT_TYPE_I_PCM8)) {
		/* Dallas DS4201 workaround: it advertises U8 format, but really
		   supports S8. */
		if (chip->usb_id == USB_ID(0x04fa, 0x4201))
			pcm_formats |= SNDRV_PCM_FMTBIT_S8;
		else
			pcm_formats |= SNDRV_PCM_FMTBIT_U8;
	}
	if (format & (1 << UAC_FORMAT_TYPE_I_IEEE_FLOAT)) {
		pcm_formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
	}
	if (format & (1 << UAC_FORMAT_TYPE_I_ALAW)) {
		pcm_formats |= SNDRV_PCM_FMTBIT_A_LAW;
	}
	if (format & (1 << UAC_FORMAT_TYPE_I_MULAW)) {
		pcm_formats |= SNDRV_PCM_FMTBIT_MU_LAW;
	}
	if (format & ~0x3f) {
		snd_printk(KERN_INFO "%d:%u:%d : unsupported format bits %#x\n",
			   chip->dev->devnum, fp->iface, fp->altsetting, format);
	}
	return pcm_formats;
}


/*
 * parse the format descriptor and stores the possible sample rates
 * on the audioformat table (audio class v1).
 *
 * @dev: usb device
 * @fp: audioformat record
 * @fmt: the format descriptor
 * @offset: the start offset of descriptor pointing the rate type
 *          (7 for type I and II, 8 for type II)
 */
static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audioformat *fp,
				       unsigned char *fmt, int offset)
{
	int nr_rates = fmt[offset];

	if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
		snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
				   chip->dev->devnum, fp->iface, fp->altsetting);
		return -1;
	}

	if (nr_rates) {
		/*
		 * build the rate table and bitmap flags
		 */
		int r, idx;

		fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
		if (fp->rate_table == NULL) {
			snd_printk(KERN_ERR "cannot malloc\n");
			return -1;
		}

		fp->nr_rates = 0;
		fp->rate_min = fp->rate_max = 0;
		for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
			unsigned int rate = combine_triple(&fmt[idx]);
			if (!rate)
				continue;
			/* C-Media CM6501 mislabels its 96 kHz altsetting */
			if (rate == 48000 && nr_rates == 1 &&
			    (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
			     chip->usb_id == USB_ID(0x0d8c, 0x0102)) &&
			    fp->altsetting == 5 && fp->maxpacksize == 392)
				rate = 96000;
			/* Creative VF0470 Live Cam reports 16 kHz instead of 8kHz */
			if (rate == 16000 && chip->usb_id == USB_ID(0x041e, 0x4068))
				rate = 8000;

			fp->rate_table[fp->nr_rates] = rate;
			if (!fp->rate_min || rate < fp->rate_min)
				fp->rate_min = rate;
			if (!fp->rate_max || rate > fp->rate_max)
				fp->rate_max = rate;
			fp->rates |= snd_pcm_rate_to_rate_bit(rate);
			fp->nr_rates++;
		}
		if (!fp->nr_rates) {
			hwc_debug("All rates were zero. Skipping format!\n");
			return -1;
		}
	} else {
		/* continuous rates */
		fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
		fp->rate_min = combine_triple(&fmt[offset + 1]);
		fp->rate_max = combine_triple(&fmt[offset + 4]);
	}
	return 0;
}

/*
 * parse the format descriptor and stores the possible sample rates
 * on the audioformat table (audio class v2).
 */
static int parse_audio_format_rates_v2(struct snd_usb_audio *chip,
				       struct audioformat *fp,
				       struct usb_host_interface *iface)
{
	struct usb_device *dev = chip->dev;
	unsigned char tmp[2], *data;
	int i, nr_rates, data_size, ret = 0;

	/* get the number of sample rates first by only fetching 2 bytes */
	ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
			      0x0100, chip->clock_id << 8, tmp, sizeof(tmp), 1000);

	if (ret < 0) {
		snd_printk(KERN_ERR "unable to retrieve number of sample rates\n");
		goto err;
	}

	nr_rates = (tmp[1] << 8) | tmp[0];
	data_size = 2 + 12 * nr_rates;
	data = kzalloc(data_size, GFP_KERNEL);
	if (!data) {
		ret = -ENOMEM;
		goto err;
	}

	/* now get the full information */
	ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
			       USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
			       0x0100, chip->clock_id << 8, data, data_size, 1000);

	if (ret < 0) {
		snd_printk(KERN_ERR "unable to retrieve sample rate range\n");
		ret = -EINVAL;
		goto err_free;
	}

	fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
	if (!fp->rate_table) {
		ret = -ENOMEM;
		goto err_free;
	}

	fp->nr_rates = 0;
	fp->rate_min = fp->rate_max = 0;

	for (i = 0; i < nr_rates; i++) {
		int rate = combine_quad(&data[2 + 12 * i]);

		fp->rate_table[fp->nr_rates] = rate;
		if (!fp->rate_min || rate < fp->rate_min)
			fp->rate_min = rate;
		if (!fp->rate_max || rate > fp->rate_max)
			fp->rate_max = rate;
		fp->rates |= snd_pcm_rate_to_rate_bit(rate);
		fp->nr_rates++;
	}

err_free:
	kfree(data);
err:
	return ret;
}

/*
 * parse the format type I and III descriptors
 */
static int parse_audio_format_i(struct snd_usb_audio *chip,
				struct audioformat *fp,
				int format, void *_fmt,
				struct usb_host_interface *iface)
{
	struct usb_interface_descriptor *altsd = get_iface_desc(iface);
	struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
	int protocol = altsd->bInterfaceProtocol;
	int pcm_format, ret;

	if (fmt->bFormatType == UAC_FORMAT_TYPE_III) {
		/* FIXME: the format type is really IECxxx
		 *        but we give normal PCM format to get the existing
		 *        apps working...
		 */
		switch (chip->usb_id) {

		case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
			if (chip->setup == 0x00 && 
			    fp->altsetting == 6)
				pcm_format = SNDRV_PCM_FORMAT_S16_BE;
			else
				pcm_format = SNDRV_PCM_FORMAT_S16_LE;
			break;
		default:
			pcm_format = SNDRV_PCM_FORMAT_S16_LE;
		}
		fp->formats = 1uLL << pcm_format;
	} else {
		fp->formats = parse_audio_format_i_type(chip, fp, format,
							fmt, protocol);
		if (!fp->formats)
			return -1;
	}

	/* gather possible sample rates */
	/* audio class v1 reports possible sample rates as part of the
	 * proprietary class specific descriptor.
	 * audio class v2 uses class specific EP0 range requests for that.
	 */
	switch (protocol) {
	case UAC_VERSION_1:
		fp->channels = fmt->bNrChannels;
		ret = parse_audio_format_rates_v1(chip, fp, _fmt, 7);
		break;
	case UAC_VERSION_2:
		/* fp->channels is already set in this case */
		ret = parse_audio_format_rates_v2(chip, fp, iface);
		break;
	}

	if (fp->channels < 1) {
		snd_printk(KERN_ERR "%d:%u:%d : invalid channels %d\n",
			   chip->dev->devnum, fp->iface, fp->altsetting, fp->channels);
		return -1;
	}

	return ret;
}

/*
 * parse the format type II descriptor
 */
static int parse_audio_format_ii(struct snd_usb_audio *chip,
				 struct audioformat *fp,
				 int format, void *_fmt,
				 struct usb_host_interface *iface)
{
	int brate, framesize, ret;
	struct usb_interface_descriptor *altsd = get_iface_desc(iface);
	int protocol = altsd->bInterfaceProtocol;

	switch (format) {
	case UAC_FORMAT_TYPE_II_AC3:
		/* FIXME: there is no AC3 format defined yet */
		// fp->formats = SNDRV_PCM_FMTBIT_AC3;
		fp->formats = SNDRV_PCM_FMTBIT_U8; /* temporary hack to receive byte streams */
		break;
	case UAC_FORMAT_TYPE_II_MPEG:
		fp->formats = SNDRV_PCM_FMTBIT_MPEG;
		break;
	default:
		snd_printd(KERN_INFO "%d:%u:%d : unknown format tag %#x is detected.  processed as MPEG.\n",
			   chip->dev->devnum, fp->iface, fp->altsetting, format);
		fp->formats = SNDRV_PCM_FMTBIT_MPEG;
		break;
	}

	fp->channels = 1;

	switch (protocol) {
	case UAC_VERSION_1: {
		struct uac_format_type_ii_discrete_descriptor *fmt = _fmt;
		brate = le16_to_cpu(fmt->wMaxBitRate);
		framesize = le16_to_cpu(fmt->wSamplesPerFrame);
		snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
		fp->frame_size = framesize;
		ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */
		break;
	}
	case UAC_VERSION_2: {
		struct uac_format_type_ii_ext_descriptor *fmt = _fmt;
		brate = le16_to_cpu(fmt->wMaxBitRate);
		framesize = le16_to_cpu(fmt->wSamplesPerFrame);
		snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
		fp->frame_size = framesize;
		ret = parse_audio_format_rates_v2(chip, fp, iface);
		break;
	}
	}

	return ret;
}

int snd_usb_parse_audio_format(struct snd_usb_audio *chip, struct audioformat *fp,
		       int format, unsigned char *fmt, int stream,
		       struct usb_host_interface *iface)
{
	int err;

	switch (fmt[3]) {
	case UAC_FORMAT_TYPE_I:
	case UAC_FORMAT_TYPE_III:
		err = parse_audio_format_i(chip, fp, format, fmt, iface);
		break;
	case UAC_FORMAT_TYPE_II:
		err = parse_audio_format_ii(chip, fp, format, fmt, iface);
		break;
	default:
		snd_printd(KERN_INFO "%d:%u:%d : format type %d is not supported yet\n",
			   chip->dev->devnum, fp->iface, fp->altsetting, fmt[3]);
		return -1;
	}
	fp->fmt_type = fmt[3];
	if (err < 0)
		return err;
#if 1
	/* FIXME: temporary hack for extigy/audigy 2 nx/zs */
	/* extigy apparently supports sample rates other than 48k
	 * but not in ordinary way.  so we enable only 48k atm.
	 */
	if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
	    chip->usb_id == USB_ID(0x041e, 0x3020) ||
	    chip->usb_id == USB_ID(0x041e, 0x3061)) {
		if (fmt[3] == UAC_FORMAT_TYPE_I &&
		    fp->rates != SNDRV_PCM_RATE_48000 &&
		    fp->rates != SNDRV_PCM_RATE_96000)
			return -1;
	}
#endif
	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 "quirks.h"
	29	#include "helper.h"
	30	#include "debug.h"
	31
	32	/*
	33	* parse the audio format type I descriptor
	34	* and returns the corresponding pcm format
	35	*
	36	* @dev: usb device
	37	* @fp: audioformat record
	38	* @format: the format tag (wFormatTag)
	39	* @fmt: the format type descriptor
	40	*/
29088fef	41	static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
e5779998 DM	42	struct audioformat *fp,
	43	int format, void *_fmt,
	44	int protocol)
	45	{
e5779998	46	int sample_width, sample_bytes;
29088fef	47	u64 pcm_formats;
e5779998 DM	48
	49	switch (protocol) {
	50	case UAC_VERSION_1: {
	51	struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
	52	sample_width = fmt->bBitResolution;
	53	sample_bytes = fmt->bSubframeSize;
29088fef	54	format = 1 << format;
e5779998 DM	55	break;
	56	}
	57
	58	case UAC_VERSION_2: {
	59	struct uac_format_type_i_ext_descriptor *fmt = _fmt;
	60	sample_width = fmt->bBitResolution;
	61	sample_bytes = fmt->bSubslotSize;
29088fef	62	format <<= 1;
e5779998 DM	63	break;
	64	}
	65
	66	default:
	67	return -EINVAL;
	68	}
	69
29088fef	70	pcm_formats = 0;
e5779998	71
29088fef CL	72	if (format == 0 \|\| format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED)) {
29088fef CL	73	/* some devices don't define this correctly... */
e5779998 DM	74	snd_printdd(KERN_INFO "%d:%u:%d : format type 0 is detected, processed as PCM\n",
e5779998 DM	75	chip->dev->devnum, fp->iface, fp->altsetting);
29088fef CL	76	format = 1 << UAC_FORMAT_TYPE_I_PCM;
	77	}
	78	if (format & (1 << UAC_FORMAT_TYPE_I_PCM)) {
e5779998 DM	79	if (sample_width > sample_bytes * 8) {
	80	snd_printk(KERN_INFO "%d:%u:%d : sample bitwidth %d in over sample bytes %d\n",
	81	chip->dev->devnum, fp->iface, fp->altsetting,
	82	sample_width, sample_bytes);
	83	}
	84	/* check the format byte size */
	85	switch (sample_bytes) {
	86	case 1:
29088fef	87	pcm_formats \|= SNDRV_PCM_FMTBIT_S8;
e5779998 DM	88	break;
	89	case 2:
	90	if (snd_usb_is_big_endian_format(chip, fp))
29088fef	91	pcm_formats \|= SNDRV_PCM_FMTBIT_S16_BE; /* grrr, big endian!! */
e5779998	92	else
29088fef	93	pcm_formats \|= SNDRV_PCM_FMTBIT_S16_LE;
e5779998 DM	94	break;
	95	case 3:
	96	if (snd_usb_is_big_endian_format(chip, fp))
29088fef	97	pcm_formats \|= SNDRV_PCM_FMTBIT_S24_3BE; /* grrr, big endian!! */
e5779998	98	else
29088fef	99	pcm_formats \|= SNDRV_PCM_FMTBIT_S24_3LE;
e5779998 DM	100	break;
e5779998 DM	101	case 4:
29088fef	102	pcm_formats \|= SNDRV_PCM_FMTBIT_S32_LE;
e5779998 DM	103	break;
	104	default:
	105	snd_printk(KERN_INFO "%d:%u:%d : unsupported sample bitwidth %d in %d bytes\n",
	106	chip->dev->devnum, fp->iface, fp->altsetting,
	107	sample_width, sample_bytes);
	108	break;
	109	}
29088fef CL	110	}
29088fef CL	111	if (format & (1 << UAC_FORMAT_TYPE_I_PCM8)) {
e5779998 DM	112	/* Dallas DS4201 workaround: it advertises U8 format, but really
	113	supports S8. */
	114	if (chip->usb_id == USB_ID(0x04fa, 0x4201))
29088fef CL	115	pcm_formats \|= SNDRV_PCM_FMTBIT_S8;
	116	else
	117	pcm_formats \|= SNDRV_PCM_FMTBIT_U8;
	118	}
	119	if (format & (1 << UAC_FORMAT_TYPE_I_IEEE_FLOAT)) {
	120	pcm_formats \|= SNDRV_PCM_FMTBIT_FLOAT_LE;
	121	}
	122	if (format & (1 << UAC_FORMAT_TYPE_I_ALAW)) {
	123	pcm_formats \|= SNDRV_PCM_FMTBIT_A_LAW;
	124	}
	125	if (format & (1 << UAC_FORMAT_TYPE_I_MULAW)) {
	126	pcm_formats \|= SNDRV_PCM_FMTBIT_MU_LAW;
	127	}
	128	if (format & ~0x3f) {
	129	snd_printk(KERN_INFO "%d:%u:%d : unsupported format bits %#x\n",
e5779998	130	chip->dev->devnum, fp->iface, fp->altsetting, format);
e5779998	131	}
29088fef	132	return pcm_formats;
e5779998 DM	133	}
	134
	135
	136	/*
	137	* parse the format descriptor and stores the possible sample rates
	138	* on the audioformat table (audio class v1).
	139	*
	140	* @dev: usb device
	141	* @fp: audioformat record
	142	* @fmt: the format descriptor
	143	* @offset: the start offset of descriptor pointing the rate type
	144	* (7 for type I and II, 8 for type II)
	145	*/
	146	static int parse_audio_format_rates_v1(struct snd_usb_audio chip, struct audioformat fp,
	147	unsigned char *fmt, int offset)
	148	{
	149	int nr_rates = fmt[offset];
	150
	151	if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
	152	snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
	153	chip->dev->devnum, fp->iface, fp->altsetting);
	154	return -1;
	155	}
	156
	157	if (nr_rates) {
	158	/*
	159	* build the rate table and bitmap flags
	160	*/
	161	int r, idx;
	162
	163	fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
	164	if (fp->rate_table == NULL) {
	165	snd_printk(KERN_ERR "cannot malloc\n");
	166	return -1;
	167	}
	168
	169	fp->nr_rates = 0;
	170	fp->rate_min = fp->rate_max = 0;
	171	for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
	172	unsigned int rate = combine_triple(&fmt[idx]);
	173	if (!rate)
	174	continue;
	175	/* C-Media CM6501 mislabels its 96 kHz altsetting */
	176	if (rate == 48000 && nr_rates == 1 &&
	177	(chip->usb_id == USB_ID(0x0d8c, 0x0201) \|\|
	178	chip->usb_id == USB_ID(0x0d8c, 0x0102)) &&
	179	fp->altsetting == 5 && fp->maxpacksize == 392)
	180	rate = 96000;
	181	/* Creative VF0470 Live Cam reports 16 kHz instead of 8kHz */
	182	if (rate == 16000 && chip->usb_id == USB_ID(0x041e, 0x4068))
	183	rate = 8000;
	184
	185	fp->rate_table[fp->nr_rates] = rate;
	186	if (!fp->rate_min \|\| rate < fp->rate_min)
	187	fp->rate_min = rate;
	188	if (!fp->rate_max \|\| rate > fp->rate_max)
	189	fp->rate_max = rate;
	190	fp->rates \|= snd_pcm_rate_to_rate_bit(rate);
	191	fp->nr_rates++;
	192	}
	193	if (!fp->nr_rates) {
	194	hwc_debug("All rates were zero. Skipping format!\n");
	195	return -1;
	196	}
197	} else {
198	/* continuous rates */
199	fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
200	fp->rate_min = combine_triple(&fmt[offset + 1]);
201	fp->rate_max = combine_triple(&fmt[offset + 4]);
202	}
203	return 0;
204	}
205
206	/*
207	* parse the format descriptor and stores the possible sample rates
208	* on the audioformat table (audio class v2).
209	*/
210	static int parse_audio_format_rates_v2(struct snd_usb_audio *chip,
211	struct audioformat *fp,
212	struct usb_host_interface *iface)
213	{
214	struct usb_device *dev = chip->dev;
215	unsigned char tmp[2], *data;
216	int i, nr_rates, data_size, ret = 0;
217
218	/* get the number of sample rates first by only fetching 2 bytes */
219	ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
220	USB_TYPE_CLASS \| USB_RECIP_INTERFACE \| USB_DIR_IN,
221	0x0100, chip->clock_id << 8, tmp, sizeof(tmp), 1000);
222
223	if (ret < 0) {
224	snd_printk(KERN_ERR "unable to retrieve number of sample rates\n");
225	goto err;
226	}
227
228	nr_rates = (tmp[1] << 8) \| tmp[0];
229	data_size = 2 + 12 * nr_rates;
230	data = kzalloc(data_size, GFP_KERNEL);
231	if (!data) {
232	ret = -ENOMEM;
233	goto err;
234	}
235
236	/* now get the full information */
237	ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
238	USB_TYPE_CLASS \| USB_RECIP_INTERFACE \| USB_DIR_IN,
239	0x0100, chip->clock_id << 8, data, data_size, 1000);
240
241	if (ret < 0) {
242	snd_printk(KERN_ERR "unable to retrieve sample rate range\n");
243	ret = -EINVAL;
244	goto err_free;
245	}
246
247	fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
248	if (!fp->rate_table) {
249	ret = -ENOMEM;
250	goto err_free;
251	}
252
253	fp->nr_rates = 0;
254	fp->rate_min = fp->rate_max = 0;
255
256	for (i = 0; i < nr_rates; i++) {
257	int rate = combine_quad(&data[2 + 12 * i]);
258
259	fp->rate_table[fp->nr_rates] = rate;
260	if (!fp->rate_min \|\| rate < fp->rate_min)
261	fp->rate_min = rate;
262	if (!fp->rate_max \|\| rate > fp->rate_max)
263	fp->rate_max = rate;
264	fp->rates \|= snd_pcm_rate_to_rate_bit(rate);
265	fp->nr_rates++;
266	}
267
268	err_free:
269	kfree(data);
270	err:
271	return ret;
272	}
273
274	/*
275	* parse the format type I and III descriptors
276	*/
277	static int parse_audio_format_i(struct snd_usb_audio *chip,
278	struct audioformat *fp,
279	int format, void *_fmt,
280	struct usb_host_interface *iface)
281	{
282	struct usb_interface_descriptor *altsd = get_iface_desc(iface);
283	struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
284	int protocol = altsd->bInterfaceProtocol;
285	int pcm_format, ret;
286
287	if (fmt->bFormatType == UAC_FORMAT_TYPE_III) {
288	/* FIXME: the format type is really IECxxx
289	* but we give normal PCM format to get the existing
290	* apps working...
291	*/
292	switch (chip->usb_id) {
293
294	case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
295	if (chip->setup == 0x00 &&
296	fp->altsetting == 6)
297	pcm_format = SNDRV_PCM_FORMAT_S16_BE;
298	else
299	pcm_format = SNDRV_PCM_FORMAT_S16_LE;
300	break;
301	default:
302	pcm_format = SNDRV_PCM_FORMAT_S16_LE;
303	}
29088fef	304	fp->formats = 1uLL << pcm_format;
e5779998	305	} else {
29088fef CL	306	fp->formats = parse_audio_format_i_type(chip, fp, format,
	307	fmt, protocol);
	308	if (!fp->formats)
e5779998 DM	309	return -1;
	310	}
	311
e5779998 DM	312	/* gather possible sample rates */
	313	/* audio class v1 reports possible sample rates as part of the
	314	* proprietary class specific descriptor.
	315	* audio class v2 uses class specific EP0 range requests for that.
	316	*/
	317	switch (protocol) {
	318	case UAC_VERSION_1:
	319	fp->channels = fmt->bNrChannels;
	320	ret = parse_audio_format_rates_v1(chip, fp, _fmt, 7);
	321	break;
	322	case UAC_VERSION_2:
	323	/* fp->channels is already set in this case */
	324	ret = parse_audio_format_rates_v2(chip, fp, iface);
	325	break;
	326	}
	327
	328	if (fp->channels < 1) {
	329	snd_printk(KERN_ERR "%d:%u:%d : invalid channels %d\n",
	330	chip->dev->devnum, fp->iface, fp->altsetting, fp->channels);
	331	return -1;
	332	}
	333
	334	return ret;
	335	}
	336
	337	/*
	338	* parse the format type II descriptor
	339	*/
	340	static int parse_audio_format_ii(struct snd_usb_audio *chip,
	341	struct audioformat *fp,
	342	int format, void *_fmt,
	343	struct usb_host_interface *iface)
	344	{
	345	int brate, framesize, ret;
	346	struct usb_interface_descriptor *altsd = get_iface_desc(iface);
	347	int protocol = altsd->bInterfaceProtocol;
	348
	349	switch (format) {
	350	case UAC_FORMAT_TYPE_II_AC3:
	351	/* FIXME: there is no AC3 format defined yet */
015eb0b0 CL	352	// fp->formats = SNDRV_PCM_FMTBIT_AC3;
015eb0b0 CL	353	fp->formats = SNDRV_PCM_FMTBIT_U8; /* temporary hack to receive byte streams */
e5779998 DM	354	break;
e5779998 DM	355	case UAC_FORMAT_TYPE_II_MPEG:
015eb0b0	356	fp->formats = SNDRV_PCM_FMTBIT_MPEG;
e5779998 DM	357	break;
	358	default:
	359	snd_printd(KERN_INFO "%d:%u:%d : unknown format tag %#x is detected. processed as MPEG.\n",
	360	chip->dev->devnum, fp->iface, fp->altsetting, format);
015eb0b0	361	fp->formats = SNDRV_PCM_FMTBIT_MPEG;
e5779998 DM	362	break;
	363	}
	364
	365	fp->channels = 1;
	366
	367	switch (protocol) {
	368	case UAC_VERSION_1: {
	369	struct uac_format_type_ii_discrete_descriptor *fmt = _fmt;
	370	brate = le16_to_cpu(fmt->wMaxBitRate);
	371	framesize = le16_to_cpu(fmt->wSamplesPerFrame);
	372	snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
	373	fp->frame_size = framesize;
	374	ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */
	375	break;
	376	}
	377	case UAC_VERSION_2: {
	378	struct uac_format_type_ii_ext_descriptor *fmt = _fmt;
	379	brate = le16_to_cpu(fmt->wMaxBitRate);
	380	framesize = le16_to_cpu(fmt->wSamplesPerFrame);
	381	snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
	382	fp->frame_size = framesize;
	383	ret = parse_audio_format_rates_v2(chip, fp, iface);
	384	break;
	385	}
	386	}
	387
	388	return ret;
	389	}
	390
	391	int snd_usb_parse_audio_format(struct snd_usb_audio chip, struct audioformat fp,
	392	int format, unsigned char *fmt, int stream,
	393	struct usb_host_interface *iface)
	394	{
	395	int err;
	396
	397	switch (fmt[3]) {
	398	case UAC_FORMAT_TYPE_I:
	399	case UAC_FORMAT_TYPE_III:
	400	err = parse_audio_format_i(chip, fp, format, fmt, iface);
	401	break;
	402	case UAC_FORMAT_TYPE_II:
	403	err = parse_audio_format_ii(chip, fp, format, fmt, iface);
	404	break;
	405	default:
	406	snd_printd(KERN_INFO "%d:%u:%d : format type %d is not supported yet\n",
	407	chip->dev->devnum, fp->iface, fp->altsetting, fmt[3]);
	408	return -1;
	409	}
	410	fp->fmt_type = fmt[3];
	411	if (err < 0)
	412	return err;
	413	#if 1
	414	/* FIXME: temporary hack for extigy/audigy 2 nx/zs */
	415	/* extigy apparently supports sample rates other than 48k
	416	* but not in ordinary way. so we enable only 48k atm.
	417	*/
	418	if (chip->usb_id == USB_ID(0x041e, 0x3000) \|\|
	419	chip->usb_id == USB_ID(0x041e, 0x3020) \|\|
	420	chip->usb_id == USB_ID(0x041e, 0x3061)) {
	421	if (fmt[3] == UAC_FORMAT_TYPE_I &&
	422	fp->rates != SNDRV_PCM_RATE_48000 &&
	423	fp->rates != SNDRV_PCM_RATE_96000)
	424	return -1;
	425	}
426	#endif
427	return 0;
428	}
429