642 lines
17 KiB
C
642 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Clock domain and sample rate management functions
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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 <linux/usb/audio-v3.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 void *find_uac_clock_desc(struct usb_host_interface *iface, int id,
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bool (*validator)(void *, int), u8 type)
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{
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void *cs = NULL;
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while ((cs = snd_usb_find_csint_desc(iface->extra, iface->extralen,
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cs, type))) {
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if (validator(cs, 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 bool validate_clock_source_v2(void *p, int id)
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{
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struct uac_clock_source_descriptor *cs = p;
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return cs->bClockID == id;
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}
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static bool validate_clock_source_v3(void *p, int id)
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{
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struct uac3_clock_source_descriptor *cs = p;
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return cs->bClockID == id;
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}
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static bool validate_clock_selector_v2(void *p, int id)
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{
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struct uac_clock_selector_descriptor *cs = p;
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return cs->bClockID == id;
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}
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static bool validate_clock_selector_v3(void *p, int id)
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{
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struct uac3_clock_selector_descriptor *cs = p;
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return cs->bClockID == id;
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}
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static bool validate_clock_multiplier_v2(void *p, int id)
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{
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struct uac_clock_multiplier_descriptor *cs = p;
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return cs->bClockID == id;
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}
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static bool validate_clock_multiplier_v3(void *p, int id)
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{
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struct uac3_clock_multiplier_descriptor *cs = p;
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return cs->bClockID == id;
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}
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#define DEFINE_FIND_HELPER(name, obj, validator, type) \
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static obj *name(struct usb_host_interface *iface, int id) \
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{ \
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return find_uac_clock_desc(iface, id, validator, type); \
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}
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DEFINE_FIND_HELPER(snd_usb_find_clock_source,
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struct uac_clock_source_descriptor,
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validate_clock_source_v2, UAC2_CLOCK_SOURCE);
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DEFINE_FIND_HELPER(snd_usb_find_clock_source_v3,
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struct uac3_clock_source_descriptor,
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validate_clock_source_v3, UAC3_CLOCK_SOURCE);
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DEFINE_FIND_HELPER(snd_usb_find_clock_selector,
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struct uac_clock_selector_descriptor,
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validate_clock_selector_v2, UAC2_CLOCK_SELECTOR);
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DEFINE_FIND_HELPER(snd_usb_find_clock_selector_v3,
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struct uac3_clock_selector_descriptor,
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validate_clock_selector_v3, UAC3_CLOCK_SELECTOR);
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DEFINE_FIND_HELPER(snd_usb_find_clock_multiplier,
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struct uac_clock_multiplier_descriptor,
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validate_clock_multiplier_v2, UAC2_CLOCK_MULTIPLIER);
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DEFINE_FIND_HELPER(snd_usb_find_clock_multiplier_v3,
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struct uac3_clock_multiplier_descriptor,
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validate_clock_multiplier_v3, UAC3_CLOCK_MULTIPLIER);
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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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usb_audio_err(chip,
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"setting selector (id %d) unexpected length %d\n",
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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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usb_audio_err(chip,
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"setting selector (id %d) to %x failed (current: %d)\n",
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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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/*
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* Assume the clock is valid if clock source supports only one single sample
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* rate, the terminal is connected directly to it (there is no clock selector)
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* and clock type is internal. This is to deal with some Denon DJ controllers
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* that always reports that clock is invalid.
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*/
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static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip,
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struct audioformat *fmt,
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int source_id)
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{
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if (fmt->protocol == UAC_VERSION_2) {
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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 false;
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return (fmt->nr_rates == 1 &&
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(fmt->clock & 0xff) == cs_desc->bClockID &&
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(cs_desc->bmAttributes & 0x3) !=
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UAC_CLOCK_SOURCE_TYPE_EXT);
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}
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return false;
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}
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static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
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struct audioformat *fmt,
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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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u32 bmControls;
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if (fmt->protocol == UAC_VERSION_3) {
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struct uac3_clock_source_descriptor *cs_desc =
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snd_usb_find_clock_source_v3(chip->ctrl_intf, source_id);
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if (!cs_desc)
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return false;
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bmControls = le32_to_cpu(cs_desc->bmControls);
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} else { /* UAC_VERSION_1/2 */
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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 false;
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bmControls = cs_desc->bmControls;
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}
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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 (!uac_v2v3_control_is_readable(bmControls,
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UAC2_CS_CONTROL_CLOCK_VALID))
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return true;
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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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dev_warn(&dev->dev,
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"%s(): cannot get clock validity for id %d\n",
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__func__, source_id);
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return false;
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}
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if (data)
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return true;
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else
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return uac_clock_source_is_valid_quirk(chip, fmt, source_id);
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}
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static int __uac_clock_find_source(struct snd_usb_audio *chip,
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struct audioformat *fmt, int entity_id,
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unsigned long *visited, 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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usb_audio_warn(chip,
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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, fmt,
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entity_id)) {
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usb_audio_err(chip,
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"clock source %d is not valid, cannot use\n",
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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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usb_audio_err(chip,
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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, fmt,
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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, fmt,
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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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usb_audio_info(chip,
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"found and selected valid clock source %d\n",
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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, fmt,
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multiplier->bCSourceID,
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visited, validate);
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return -EINVAL;
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}
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static int __uac3_clock_find_source(struct snd_usb_audio *chip,
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struct audioformat *fmt, int entity_id,
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unsigned long *visited, bool validate)
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{
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struct uac3_clock_source_descriptor *source;
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struct uac3_clock_selector_descriptor *selector;
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struct uac3_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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usb_audio_warn(chip,
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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_v3(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, fmt,
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entity_id)) {
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usb_audio_err(chip,
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"clock source %d is not valid, cannot use\n",
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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_v3(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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usb_audio_err(chip,
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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 = __uac3_clock_find_source(chip, fmt,
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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 = __uac3_clock_find_source(chip, fmt,
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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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usb_audio_info(chip,
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"found and selected valid clock source %d\n",
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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_v3(chip->ctrl_intf,
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entity_id);
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if (multiplier)
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return __uac3_clock_find_source(chip, fmt,
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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,
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struct audioformat *fmt, 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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switch (fmt->protocol) {
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case UAC_VERSION_2:
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return __uac_clock_find_source(chip, fmt, fmt->clock, visited,
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validate);
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case UAC_VERSION_3:
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return __uac3_clock_find_source(chip, fmt, fmt->clock, visited,
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validate);
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default:
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return -EINVAL;
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}
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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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if (get_iface_desc(alts)->bNumEndpoints < 1)
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return -EINVAL;
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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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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));
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if (err < 0) {
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dev_err(&dev->dev, "%d:%d: cannot set freq %d to ep %#x\n",
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iface, fmt->altsetting, rate, ep);
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return err;
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}
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/* Don't check the sample rate for devices which we know don't
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* support reading */
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if (snd_usb_get_sample_rate_quirk(chip))
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return 0;
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/* the firmware is likely buggy, don't repeat to fail too many times */
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if (chip->sample_rate_read_error > 2)
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return 0;
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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));
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if (err < 0) {
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dev_err(&dev->dev, "%d:%d: cannot get freq at ep %#x\n",
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iface, fmt->altsetting, ep);
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chip->sample_rate_read_error++;
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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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dev_warn(&dev->dev, "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_v2v3(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,
|
|
UAC2_CS_CONTROL_SAM_FREQ << 8,
|
|
snd_usb_ctrl_intf(chip) | (clock << 8),
|
|
&data, sizeof(data));
|
|
if (err < 0) {
|
|
dev_warn(&dev->dev, "%d:%d: cannot get freq (v2/v3): err %d\n",
|
|
iface, altsetting, err);
|
|
return 0;
|
|
}
|
|
|
|
return le32_to_cpu(data);
|
|
}
|
|
|
|
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, 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, 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, clock))
|
|
return -ENXIO;
|
|
return 0;
|
|
}
|
|
|
|
int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
|
|
struct usb_host_interface *alts,
|
|
struct audioformat *fmt, int rate)
|
|
{
|
|
switch (fmt->protocol) {
|
|
case UAC_VERSION_1:
|
|
default:
|
|
return set_sample_rate_v1(chip, iface, alts, fmt, rate);
|
|
|
|
case UAC_VERSION_3:
|
|
if (chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
|
|
if (rate != UAC3_BADD_SAMPLING_RATE)
|
|
return -ENXIO;
|
|
else
|
|
return 0;
|
|
}
|
|
/* fall through */
|
|
case UAC_VERSION_2:
|
|
return set_sample_rate_v2v3(chip, iface, alts, fmt, rate);
|
|
}
|
|
}
|
|
|