示例#1
0
static int uac_clock_selector_set_val(struct snd_usb_audio *chip, int selector_id,
					unsigned char pin)
{
	int ret;

	ret = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0),
			      UAC2_CS_CUR,
			      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
			      UAC2_CX_CLOCK_SELECTOR << 8,
			      snd_usb_ctrl_intf(chip) | (selector_id << 8),
			      &pin, sizeof(pin));
	if (ret < 0)
		return ret;

	if (ret != sizeof(pin)) {
		usb_audio_err(chip,
			"setting selector (id %d) unexpected length %d\n",
			selector_id, ret);
		return -EINVAL;
	}

	ret = uac_clock_selector_get_val(chip, selector_id);
	if (ret < 0)
		return ret;

	if (ret != pin) {
		usb_audio_err(chip,
			"setting selector (id %d) to %x failed (current: %d)\n",
			selector_id, pin, ret);
		return -EINVAL;
	}

	return ret;
}
/*
 * parse the format type I and III descriptors
 */
static int parse_audio_format_i(struct snd_usb_audio *chip,
				struct audioformat *fp, unsigned int format,
				struct uac_format_type_i_continuous_descriptor *fmt)
{
	snd_pcm_format_t pcm_format;
	int 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 = pcm_format_to_bits(pcm_format);
	} else {
		fp->formats = parse_audio_format_i_type(chip, fp, format, fmt);
		if (!fp->formats)
			return -EINVAL;
	}

	/* 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 (fp->protocol) {
	default:
	case UAC_VERSION_1:
		fp->channels = fmt->bNrChannels;
		ret = parse_audio_format_rates_v1(chip, fp, (unsigned char *) fmt, 7);
		break;
	case UAC_VERSION_2:
		/* fp->channels is already set in this case */
		ret = parse_audio_format_rates_v2(chip, fp);
		break;
	}

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

	return ret;
}
/*
 * Helper function to walk the array of sample rate triplets reported by
 * the device. The problem is that we need to parse whole array first to
 * get to know how many sample rates we have to expect.
 * Then fp->rate_table can be allocated and filled.
 */
static int parse_uac2_sample_rate_range(struct snd_usb_audio *chip,
					struct audioformat *fp, int nr_triplets,
					const unsigned char *data)
{
	int i, nr_rates = 0;

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

	for (i = 0; i < nr_triplets; i++) {
		int min = combine_quad(&data[2 + 12 * i]);
		int max = combine_quad(&data[6 + 12 * i]);
		int res = combine_quad(&data[10 + 12 * i]);
		unsigned int rate;

		if ((max < 0) || (min < 0) || (res < 0) || (max < min))
			continue;

		/*
		 * for ranges with res == 1, we announce a continuous sample
		 * rate range, and this function should return 0 for no further
		 * parsing.
		 */
		if (res == 1) {
			fp->rate_min = min;
			fp->rate_max = max;
			fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
			return 0;
		}

		for (rate = min; rate <= max; rate += res) {
			if (fp->rate_table)
				fp->rate_table[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);

			nr_rates++;
			if (nr_rates >= MAX_NR_RATES) {
				usb_audio_err(chip, "invalid uac2 rates\n");
				break;
			}

			/* avoid endless loop */
			if (res == 0)
				break;
		}
	}

	return nr_rates;
}
/*
 * 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)) {
		usb_audio_err(chip,
			"%u:%d : invalid UAC_FORMAT_TYPE desc\n",
			fp->iface, fp->altsetting);
		return -EINVAL;
	}

	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) {
			usb_audio_err(chip, "cannot malloc\n");
			return -ENOMEM;
		}

		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 */
			/* Terratec Aureon 7.1 USB C-Media 6206, too */
			if (rate == 48000 && nr_rates == 1 &&
			    (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
			     chip->usb_id == USB_ID(0x0d8c, 0x0102) ||
			     chip->usb_id == USB_ID(0x0ccd, 0x00b1)) &&
			    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 -EINVAL;
		}
	} 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;
}
示例#5
0
static int set_sample_rate_v2v3(struct snd_usb_audio *chip, int iface,
			      struct usb_host_interface *alts,
			      struct audioformat *fmt, int rate)
{
	struct usb_device *dev = chip->dev;
	__le32 data;
	int err, cur_rate, prev_rate;
	int clock;
	bool writeable;
	u32 bmControls;

	/* First, try to find a valid clock. This may trigger
	 * automatic clock selection if the current clock is not
	 * valid.
	 */
	clock = snd_usb_clock_find_source(chip, fmt->protocol,
					  fmt->clock, true);
	if (clock < 0) {
		/* We did not find a valid clock, but that might be
		 * because the current sample rate does not match an
		 * external clock source. Try again without validation
		 * and we will do another validation after setting the
		 * rate.
		 */
		clock = snd_usb_clock_find_source(chip, fmt->protocol,
						  fmt->clock, false);
		if (clock < 0)
			return clock;
	}

	prev_rate = get_sample_rate_v2v3(chip, iface, fmt->altsetting, clock);
	if (prev_rate == rate)
		goto validation;

	if (fmt->protocol == UAC_VERSION_3) {
		struct uac3_clock_source_descriptor *cs_desc;

		cs_desc = snd_usb_find_clock_source_v3(chip->ctrl_intf, clock);
		bmControls = le32_to_cpu(cs_desc->bmControls);
	} else {
		struct uac_clock_source_descriptor *cs_desc;

		cs_desc = snd_usb_find_clock_source(chip->ctrl_intf, clock);
		bmControls = cs_desc->bmControls;
	}

	writeable = uac_v2v3_control_is_writeable(bmControls,
						  UAC2_CS_CONTROL_SAM_FREQ);
	if (writeable) {
		data = cpu_to_le32(rate);
		err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
				      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
				      UAC2_CS_CONTROL_SAM_FREQ << 8,
				      snd_usb_ctrl_intf(chip) | (clock << 8),
				      &data, sizeof(data));
		if (err < 0) {
			usb_audio_err(chip,
				"%d:%d: cannot set freq %d (v2/v3): err %d\n",
				iface, fmt->altsetting, rate, err);
			return err;
		}

		cur_rate = get_sample_rate_v2v3(chip, iface,
						fmt->altsetting, clock);
	} else {
		cur_rate = prev_rate;
	}

	if (cur_rate != rate) {
		if (!writeable) {
			usb_audio_warn(chip,
				 "%d:%d: freq mismatch (RO clock): req %d, clock runs @%d\n",
				 iface, fmt->altsetting, rate, cur_rate);
			return -ENXIO;
		}
		usb_audio_dbg(chip,
			"current rate %d is different from the runtime rate %d\n",
			cur_rate, rate);
	}

	/* Some devices doesn't respond to sample rate changes while the
	 * interface is active. */
	if (rate != prev_rate) {
		usb_set_interface(dev, iface, 0);
		snd_usb_set_interface_quirk(dev);
		usb_set_interface(dev, iface, fmt->altsetting);
		snd_usb_set_interface_quirk(dev);
	}

validation:
	/* validate clock after rate change */
	if (!uac_clock_source_is_valid(chip, fmt->protocol, clock))
		return -ENXIO;
	return 0;
}
示例#6
0
static int __uac3_clock_find_source(struct snd_usb_audio *chip, int entity_id,
				   unsigned long *visited, bool validate)
{
	struct uac3_clock_source_descriptor *source;
	struct uac3_clock_selector_descriptor *selector;
	struct uac3_clock_multiplier_descriptor *multiplier;

	entity_id &= 0xff;

	if (test_and_set_bit(entity_id, visited)) {
		usb_audio_warn(chip,
			 "%s(): recursive clock topology detected, id %d.\n",
			 __func__, entity_id);
		return -EINVAL;
	}

	/* first, see if the ID we're looking for is a clock source already */
	source = snd_usb_find_clock_source_v3(chip->ctrl_intf, entity_id);
	if (source) {
		entity_id = source->bClockID;
		if (validate && !uac_clock_source_is_valid(chip, UAC_VERSION_3,
								entity_id)) {
			usb_audio_err(chip,
				"clock source %d is not valid, cannot use\n",
				entity_id);
			return -ENXIO;
		}
		return entity_id;
	}

	selector = snd_usb_find_clock_selector_v3(chip->ctrl_intf, entity_id);
	if (selector) {
		int ret, i, cur;

		/* the entity ID we are looking for is a selector.
		 * find out what it currently selects */
		ret = uac_clock_selector_get_val(chip, selector->bClockID);
		if (ret < 0)
			return ret;

		/* Selector values are one-based */

		if (ret > selector->bNrInPins || ret < 1) {
			usb_audio_err(chip,
				"%s(): selector reported illegal value, id %d, ret %d\n",
				__func__, selector->bClockID, ret);

			return -EINVAL;
		}

		cur = ret;
		ret = __uac3_clock_find_source(chip, selector->baCSourceID[ret - 1],
					       visited, validate);
		if (!validate || ret > 0 || !chip->autoclock)
			return ret;

		/* The current clock source is invalid, try others. */
		for (i = 1; i <= selector->bNrInPins; i++) {
			int err;

			if (i == cur)
				continue;

			ret = __uac3_clock_find_source(chip, selector->baCSourceID[i - 1],
				visited, true);
			if (ret < 0)
				continue;

			err = uac_clock_selector_set_val(chip, entity_id, i);
			if (err < 0)
				continue;

			usb_audio_info(chip,
				 "found and selected valid clock source %d\n",
				 ret);
			return ret;
		}

		return -ENXIO;
	}

	/* FIXME: multipliers only act as pass-thru element for now */
	multiplier = snd_usb_find_clock_multiplier_v3(chip->ctrl_intf,
						      entity_id);
	if (multiplier)
		return __uac3_clock_find_source(chip, multiplier->bCSourceID,
						visited, validate);

	return -EINVAL;
}