![Clemens Ladisch](/assets/img/avatar_default.png)
Instead of reading bInterfaceProtocol from the descriptor whenever it's needed, store this value in the audioformat structure. Besides simplifying some code, this will allow us to correctly handle vendor- specific devices where the descriptors are marked with other values. Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
420 lines
12 KiB
C
420 lines
12 KiB
C
/*
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* Clock domain and sample rate management functions
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/bitops.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/usb.h>
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#include <linux/usb/audio.h>
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#include <linux/usb/audio-v2.h>
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#include <sound/core.h>
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#include <sound/info.h>
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#include <sound/pcm.h>
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#include "usbaudio.h"
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#include "card.h"
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#include "helper.h"
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#include "clock.h"
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#include "quirks.h"
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static struct uac_clock_source_descriptor *
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snd_usb_find_clock_source(struct usb_host_interface *ctrl_iface,
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int clock_id)
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{
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struct uac_clock_source_descriptor *cs = NULL;
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while ((cs = snd_usb_find_csint_desc(ctrl_iface->extra,
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ctrl_iface->extralen,
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cs, UAC2_CLOCK_SOURCE))) {
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if (cs->bClockID == clock_id)
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return cs;
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}
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return NULL;
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}
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static struct uac_clock_selector_descriptor *
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snd_usb_find_clock_selector(struct usb_host_interface *ctrl_iface,
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int clock_id)
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{
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struct uac_clock_selector_descriptor *cs = NULL;
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while ((cs = snd_usb_find_csint_desc(ctrl_iface->extra,
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ctrl_iface->extralen,
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cs, UAC2_CLOCK_SELECTOR))) {
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if (cs->bClockID == clock_id)
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return cs;
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}
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return NULL;
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}
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static struct uac_clock_multiplier_descriptor *
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snd_usb_find_clock_multiplier(struct usb_host_interface *ctrl_iface,
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int clock_id)
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{
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struct uac_clock_multiplier_descriptor *cs = NULL;
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while ((cs = snd_usb_find_csint_desc(ctrl_iface->extra,
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ctrl_iface->extralen,
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cs, UAC2_CLOCK_MULTIPLIER))) {
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if (cs->bClockID == clock_id)
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return cs;
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}
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return NULL;
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}
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static int uac_clock_selector_get_val(struct snd_usb_audio *chip, int selector_id)
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{
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unsigned char buf;
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int ret;
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ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
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UAC2_CS_CUR,
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USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
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UAC2_CX_CLOCK_SELECTOR << 8,
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snd_usb_ctrl_intf(chip) | (selector_id << 8),
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&buf, sizeof(buf));
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if (ret < 0)
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return ret;
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return buf;
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}
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static int uac_clock_selector_set_val(struct snd_usb_audio *chip, int selector_id,
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unsigned char pin)
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{
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int ret;
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ret = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0),
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UAC2_CS_CUR,
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USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
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UAC2_CX_CLOCK_SELECTOR << 8,
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snd_usb_ctrl_intf(chip) | (selector_id << 8),
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&pin, sizeof(pin));
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if (ret < 0)
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return ret;
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if (ret != sizeof(pin)) {
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snd_printk(KERN_ERR
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"usb-audio:%d: setting selector (id %d) unexpected length %d\n",
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chip->dev->devnum, selector_id, ret);
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return -EINVAL;
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}
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ret = uac_clock_selector_get_val(chip, selector_id);
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if (ret < 0)
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return ret;
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if (ret != pin) {
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snd_printk(KERN_ERR
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"usb-audio:%d: setting selector (id %d) to %x failed (current: %d)\n",
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chip->dev->devnum, selector_id, pin, ret);
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return -EINVAL;
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}
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return ret;
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}
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static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, int source_id)
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{
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int err;
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unsigned char data;
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struct usb_device *dev = chip->dev;
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struct uac_clock_source_descriptor *cs_desc =
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snd_usb_find_clock_source(chip->ctrl_intf, source_id);
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if (!cs_desc)
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return 0;
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/* If a clock source can't tell us whether it's valid, we assume it is */
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if (!uac2_control_is_readable(cs_desc->bmControls,
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UAC2_CS_CONTROL_CLOCK_VALID - 1))
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return 1;
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err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
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USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
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UAC2_CS_CONTROL_CLOCK_VALID << 8,
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snd_usb_ctrl_intf(chip) | (source_id << 8),
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&data, sizeof(data));
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if (err < 0) {
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snd_printk(KERN_WARNING "%s(): cannot get clock validity for id %d\n",
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__func__, source_id);
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return 0;
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}
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return !!data;
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}
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static int __uac_clock_find_source(struct snd_usb_audio *chip,
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int entity_id, unsigned long *visited,
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bool validate)
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{
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struct uac_clock_source_descriptor *source;
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struct uac_clock_selector_descriptor *selector;
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struct uac_clock_multiplier_descriptor *multiplier;
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entity_id &= 0xff;
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if (test_and_set_bit(entity_id, visited)) {
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snd_printk(KERN_WARNING
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"%s(): recursive clock topology detected, id %d.\n",
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__func__, entity_id);
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return -EINVAL;
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}
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/* first, see if the ID we're looking for is a clock source already */
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source = snd_usb_find_clock_source(chip->ctrl_intf, entity_id);
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if (source) {
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entity_id = source->bClockID;
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if (validate && !uac_clock_source_is_valid(chip, entity_id)) {
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snd_printk(KERN_ERR "usb-audio:%d: clock source %d is not valid, cannot use\n",
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chip->dev->devnum, entity_id);
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return -ENXIO;
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}
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return entity_id;
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}
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selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id);
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if (selector) {
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int ret, i, cur;
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/* the entity ID we are looking for is a selector.
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* find out what it currently selects */
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ret = uac_clock_selector_get_val(chip, selector->bClockID);
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if (ret < 0)
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return ret;
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/* Selector values are one-based */
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if (ret > selector->bNrInPins || ret < 1) {
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snd_printk(KERN_ERR
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"%s(): selector reported illegal value, id %d, ret %d\n",
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__func__, selector->bClockID, ret);
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return -EINVAL;
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}
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cur = ret;
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ret = __uac_clock_find_source(chip, selector->baCSourceID[ret - 1],
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visited, validate);
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if (!validate || ret > 0 || !chip->autoclock)
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return ret;
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/* The current clock source is invalid, try others. */
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for (i = 1; i <= selector->bNrInPins; i++) {
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int err;
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if (i == cur)
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continue;
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ret = __uac_clock_find_source(chip, selector->baCSourceID[i - 1],
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visited, true);
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if (ret < 0)
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continue;
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err = uac_clock_selector_set_val(chip, entity_id, i);
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if (err < 0)
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continue;
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snd_printk(KERN_INFO
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"usb-audio:%d: found and selected valid clock source %d\n",
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chip->dev->devnum, ret);
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return ret;
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}
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return -ENXIO;
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}
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/* FIXME: multipliers only act as pass-thru element for now */
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multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id);
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if (multiplier)
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return __uac_clock_find_source(chip, multiplier->bCSourceID,
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visited, validate);
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return -EINVAL;
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}
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/*
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* For all kinds of sample rate settings and other device queries,
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* the clock source (end-leaf) must be used. However, clock selectors,
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* clock multipliers and sample rate converters may be specified as
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* clock source input to terminal. This functions walks the clock path
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* to its end and tries to find the source.
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*
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* The 'visited' bitfield is used internally to detect recursive loops.
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*
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* Returns the clock source UnitID (>=0) on success, or an error.
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*/
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int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id,
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bool validate)
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{
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DECLARE_BITMAP(visited, 256);
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memset(visited, 0, sizeof(visited));
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return __uac_clock_find_source(chip, entity_id, visited, validate);
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}
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static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
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struct usb_host_interface *alts,
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struct audioformat *fmt, int rate)
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{
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struct usb_device *dev = chip->dev;
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unsigned int ep;
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unsigned char data[3];
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int err, crate;
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ep = get_endpoint(alts, 0)->bEndpointAddress;
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/* if endpoint doesn't have sampling rate control, bail out */
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if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE))
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return 0;
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data[0] = rate;
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data[1] = rate >> 8;
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data[2] = rate >> 16;
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if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
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USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
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UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
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data, sizeof(data))) < 0) {
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snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep %#x\n",
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dev->devnum, iface, fmt->altsetting, rate, ep);
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return err;
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}
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if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
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USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN,
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UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
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data, sizeof(data))) < 0) {
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snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep %#x\n",
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dev->devnum, iface, fmt->altsetting, ep);
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return 0; /* some devices don't support reading */
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}
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crate = data[0] | (data[1] << 8) | (data[2] << 16);
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if (crate != rate) {
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snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
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// runtime->rate = crate;
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}
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return 0;
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}
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static int get_sample_rate_v2(struct snd_usb_audio *chip, int iface,
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int altsetting, int clock)
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{
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struct usb_device *dev = chip->dev;
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__le32 data;
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int err;
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err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
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USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
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UAC2_CS_CONTROL_SAM_FREQ << 8,
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snd_usb_ctrl_intf(chip) | (clock << 8),
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&data, sizeof(data));
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if (err < 0) {
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snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq (v2): err %d\n",
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dev->devnum, iface, altsetting, err);
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return 0;
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}
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return le32_to_cpu(data);
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}
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static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface,
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struct usb_host_interface *alts,
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struct audioformat *fmt, int rate)
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{
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struct usb_device *dev = chip->dev;
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__le32 data;
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int err, cur_rate, prev_rate;
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int clock;
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bool writeable;
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struct uac_clock_source_descriptor *cs_desc;
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clock = snd_usb_clock_find_source(chip, fmt->clock, true);
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if (clock < 0)
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return clock;
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prev_rate = get_sample_rate_v2(chip, iface, fmt->altsetting, clock);
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if (prev_rate == rate)
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return 0;
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cs_desc = snd_usb_find_clock_source(chip->ctrl_intf, clock);
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writeable = uac2_control_is_writeable(cs_desc->bmControls, UAC2_CS_CONTROL_SAM_FREQ - 1);
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if (writeable) {
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data = cpu_to_le32(rate);
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err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
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USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
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UAC2_CS_CONTROL_SAM_FREQ << 8,
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snd_usb_ctrl_intf(chip) | (clock << 8),
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&data, sizeof(data));
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if (err < 0) {
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snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d (v2): err %d\n",
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dev->devnum, iface, fmt->altsetting, rate, err);
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return err;
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}
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cur_rate = get_sample_rate_v2(chip, iface, fmt->altsetting, clock);
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} else {
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cur_rate = prev_rate;
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}
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if (cur_rate != rate) {
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if (!writeable) {
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snd_printk(KERN_WARNING
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"%d:%d:%d: freq mismatch (RO clock): req %d, clock runs @%d\n",
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dev->devnum, iface, fmt->altsetting, rate, cur_rate);
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return -ENXIO;
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}
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snd_printd(KERN_WARNING
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"current rate %d is different from the runtime rate %d\n",
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cur_rate, rate);
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}
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/* Some devices doesn't respond to sample rate changes while the
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* interface is active. */
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if (rate != prev_rate) {
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usb_set_interface(dev, iface, 0);
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snd_usb_set_interface_quirk(dev);
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usb_set_interface(dev, iface, fmt->altsetting);
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snd_usb_set_interface_quirk(dev);
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}
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return 0;
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}
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int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
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struct usb_host_interface *alts,
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struct audioformat *fmt, int rate)
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{
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switch (fmt->protocol) {
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case UAC_VERSION_1:
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default:
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return set_sample_rate_v1(chip, iface, alts, fmt, rate);
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case UAC_VERSION_2:
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return set_sample_rate_v2(chip, iface, alts, fmt, rate);
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}
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}
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