312 строки
8.7 KiB
C
312 строки
8.7 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/list.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/usb.h>
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#include <linux/moduleparam.h>
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#include <linux/mutex.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 <sound/pcm_params.h>
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#include <sound/initval.h>
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#include "usbaudio.h"
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#include "card.h"
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#include "midi.h"
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#include "mixer.h"
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#include "proc.h"
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#include "quirks.h"
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#include "endpoint.h"
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#include "helper.h"
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#include "debug.h"
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#include "pcm.h"
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#include "urb.h"
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#include "format.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, selector_id << 8,
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&buf, sizeof(buf), 1000);
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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 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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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, source_id << 8,
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&data, sizeof(data), 1000);
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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 err;
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}
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return !!data;
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}
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/* Try to find the clock source ID of a given clock entity */
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static int __uac_clock_find_source(struct snd_usb_audio *chip,
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struct usb_host_interface *host_iface,
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int entity_id, unsigned long *visited)
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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(host_iface, entity_id);
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if (source)
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return source->bClockID;
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selector = snd_usb_find_clock_selector(host_iface, entity_id);
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if (selector) {
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int ret;
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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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if (ret > selector->bNrInPins || ret < 1) {
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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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return __uac_clock_find_source(chip, host_iface,
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selector->baCSourceID[ret-1],
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visited);
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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(host_iface, entity_id);
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if (multiplier)
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return __uac_clock_find_source(chip, host_iface,
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multiplier->bCSourceID, visited);
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return -EINVAL;
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}
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int snd_usb_clock_find_source(struct snd_usb_audio *chip,
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struct usb_host_interface *host_iface,
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int entity_id)
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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, host_iface, entity_id, visited);
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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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snd_printk(KERN_WARNING "%d:%d:%d: endpoint lacks sample rate attribute bit, cannot set.\n",
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dev->devnum, iface, fmt->altsetting);
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return 0;
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}
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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), 1000)) < 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), 1000)) < 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 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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unsigned char data[4];
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int err, crate;
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int clock = snd_usb_clock_find_source(chip, chip->ctrl_intf, fmt->clock);
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if (clock < 0)
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return clock;
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if (!uac_clock_source_is_valid(chip, clock)) {
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snd_printk(KERN_ERR "%d:%d:%d: clock source %d is not valid, cannot use\n",
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dev->devnum, iface, fmt->altsetting, clock);
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return -ENXIO;
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}
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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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data[3] = rate >> 24;
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if ((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, clock << 8,
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data, sizeof(data), 1000)) < 0) {
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snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d (v2)\n",
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dev->devnum, iface, fmt->altsetting, rate);
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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), 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, clock << 8,
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data, sizeof(data), 1000)) < 0) {
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snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq (v2)\n",
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dev->devnum, iface, fmt->altsetting);
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return err;
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}
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crate = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
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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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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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struct usb_interface_descriptor *altsd = get_iface_desc(alts);
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switch (altsd->bInterfaceProtocol) {
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case UAC_VERSION_1:
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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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return -EINVAL;
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}
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