Пример #1
0
static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface,
			      struct usb_host_interface *alts,
			      struct audioformat *fmt, int rate)
{
	struct usb_device *dev = chip->dev;
	unsigned char data[4];
	int err, crate;
	int clock = snd_usb_clock_find_source(chip, fmt->clock);

	if (clock < 0)
		return clock;

	if (!uac_clock_source_is_valid(chip, clock)) {
		/* TODO: should we try to find valid clock setups by ourself? */
		snd_printk(KERN_ERR "%d:%d:%d: clock source %d is not valid, cannot use\n",
			   dev->devnum, iface, fmt->altsetting, clock);
		return -ENXIO;
	}

	data[0] = rate;
	data[1] = rate >> 8;
	data[2] = rate >> 16;
	data[3] = rate >> 24;
	if ((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), 1000)) < 0) {
		snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d (v2)\n",
			   dev->devnum, iface, fmt->altsetting, rate);
		return err;
	}

	if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
				   USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
				   UAC2_CS_CONTROL_SAM_FREQ << 8,
				   snd_usb_ctrl_intf(chip) | (clock << 8),
				   data, sizeof(data), 1000)) < 0) {
#ifdef CONFIG_DEBUG_PRINTK
		snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq (v2)\n",
			   dev->devnum, iface, fmt->altsetting);
#else
		;
#endif
		return err;
	}

	crate = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
	if (crate != rate)
		snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);

	return 0;
}
Пример #2
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;
}
Пример #3
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;
}