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701 lines
18 KiB
701 lines
18 KiB
// 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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|
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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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|
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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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static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip, |
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const struct audioformat *fmt, |
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int source_id) |
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{ |
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bool ret = false; |
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int count; |
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unsigned char data; |
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struct usb_device *dev = chip->dev; |
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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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/* |
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* Assume the clock is valid if clock source supports only one |
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* single sample rate, the terminal is connected directly to it |
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* (there is no clock selector) and clock type is internal. |
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* This is to deal with some Denon DJ controllers that always |
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* reports that clock is invalid. |
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*/ |
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if (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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return true; |
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} |
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/* |
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* MOTU MicroBook IIc |
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* Sample rate changes takes more than 2 seconds for this device. Clock |
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* validity request returns false during that period. |
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*/ |
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if (chip->usb_id == USB_ID(0x07fd, 0x0004)) { |
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count = 0; |
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while ((!ret) && (count < 50)) { |
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int err; |
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msleep(100); |
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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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ret = !!data; |
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count++; |
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} |
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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, |
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const 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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const 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, err; |
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if (selector->bNrInPins == 1) { |
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ret = 1; |
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goto find_source; |
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} |
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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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find_source: |
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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 (ret > 0) { |
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err = uac_clock_selector_set_val(chip, entity_id, cur); |
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if (err < 0) |
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return err; |
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} |
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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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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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const 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, err; |
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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 (ret > 0) { |
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err = uac_clock_selector_set_val(chip, entity_id, cur); |
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if (err < 0) |
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return err; |
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} |
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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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const 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, |
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const 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[3]; |
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int err, crate; |
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|
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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, |
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fmt->endpoint, 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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fmt->iface, fmt->altsetting, rate, fmt->endpoint); |
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return err; |
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} |
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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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|
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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, |
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fmt->endpoint, 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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fmt->iface, fmt->altsetting, fmt->endpoint); |
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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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|
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crate = data[0] | (data[1] << 8) | (data[2] << 16); |
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if (!crate) { |
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dev_info(&dev->dev, "failed to read current rate; disabling the check\n"); |
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chip->sample_rate_read_error = 3; /* three strikes, see above */ |
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return 0; |
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} |
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|
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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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|
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return 0; |
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} |
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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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|
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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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dev_warn(&dev->dev, "%d:%d: cannot get freq (v2/v3): err %d\n", |
|
iface, altsetting, err); |
|
return 0; |
|
} |
|
|
|
return le32_to_cpu(data); |
|
} |
|
|
|
/* |
|
* Try to set the given sample rate: |
|
* |
|
* Return 0 if the clock source is read-only, the actual rate on success, |
|
* or a negative error code. |
|
* |
|
* This function gets called from format.c to validate each sample rate, too. |
|
* Hence no message is shown upon error |
|
*/ |
|
int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip, |
|
const struct audioformat *fmt, |
|
int clock, int rate) |
|
{ |
|
bool writeable; |
|
u32 bmControls; |
|
__le32 data; |
|
int err; |
|
|
|
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) |
|
return 0; |
|
|
|
data = cpu_to_le32(rate); |
|
err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->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) |
|
return err; |
|
|
|
return get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock); |
|
} |
|
|
|
static int set_sample_rate_v2v3(struct snd_usb_audio *chip, |
|
const struct audioformat *fmt, int rate) |
|
{ |
|
int cur_rate, prev_rate; |
|
int clock; |
|
|
|
/* 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, fmt->iface, fmt->altsetting, clock); |
|
if (prev_rate == rate) |
|
goto validation; |
|
|
|
cur_rate = snd_usb_set_sample_rate_v2v3(chip, fmt, clock, rate); |
|
if (cur_rate < 0) { |
|
usb_audio_err(chip, |
|
"%d:%d: cannot set freq %d (v2/v3): err %d\n", |
|
fmt->iface, fmt->altsetting, rate, cur_rate); |
|
return cur_rate; |
|
} |
|
|
|
if (!cur_rate) |
|
cur_rate = prev_rate; |
|
|
|
if (cur_rate != rate) { |
|
usb_audio_dbg(chip, |
|
"%d:%d: freq mismatch: req %d, clock runs @%d\n", |
|
fmt->iface, fmt->altsetting, rate, cur_rate); |
|
/* continue processing */ |
|
} |
|
|
|
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, |
|
const struct audioformat *fmt, int rate) |
|
{ |
|
usb_audio_dbg(chip, "%d:%d Set sample rate %d, clock %d\n", |
|
fmt->iface, fmt->altsetting, rate, fmt->clock); |
|
|
|
switch (fmt->protocol) { |
|
case UAC_VERSION_1: |
|
default: |
|
return set_sample_rate_v1(chip, 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; |
|
} |
|
fallthrough; |
|
case UAC_VERSION_2: |
|
return set_sample_rate_v2v3(chip, fmt, rate); |
|
} |
|
} |
|
|
|
|