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linux/sound/usb
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Geoffrey D. Bennett 2e8e9aea8c ALSA: usb-audio: Improve Focusrite sample rate filtering 
[ Upstream commit 24d2d3c5f9 ]

Replace the bLength == 10 max_rate check in
focusrite_valid_sample_rate() with filtering that also examines the
bmControls VAL_ALT_SETTINGS bit.

When VAL_ALT_SETTINGS is readable, the device uses strict
per-altsetting rate filtering (only the highest rate pair for that
altsetting is valid). When it is not readable, all rates up to
max_rate are valid.

For devices without the bLength == 10 Format Type descriptor extension
but with VAL_ALT_SETTINGS readable and multiple altsettings (only seen
in Scarlett 18i8 3rd Gen playback), fall back to the Focusrite
convention: alt 1 = 48kHz, alt 2 = 96kHz, alt 3 = 192kHz.

This produces correct rate tables for all tested Focusrite devices
(all Scarlett 2nd, 3rd, and 4th Gen, Clarett+, and Vocaster) using
only USB descriptors, allowing QUIRK_FLAG_VALIDATE_RATES to be removed
for Focusrite in the next commit.

Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/7e18c1f393a6ecb6fc75dd867a2c4dbe135e3e22.1771594828.git.g@b4.vu
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-19 16:08:31 +01:00
..
6fire ALSA: 6fire: Clean ups with guard() 2025-08-12 08:36:16 +02:00
bcd2000 ALSA: bcd2000: Use guard() for mutex locks 2025-09-01 13:54:06 +02:00
caiaq ALSA: caiaq: Use guard() for spin locks 2025-09-01 13:54:06 +02:00
hiface ALSA: hiface: Use guard() for spin locks 2025-09-01 13:54:06 +02:00
line6 ALSA: line6: Use guard() for spin locks 2025-09-10 13:20:01 +02:00
misc ALSA: ua101: Use guard() for spin locks 2025-09-01 13:54:05 +02:00
qcom ALSA: usb: qcom: Correct parameter comment for uaudio_transfer_buffer_setup() 2026-03-12 07:09:21 -04:00
usx2y ALSA: usx2y: Use guard() for mutex locks 2025-09-01 13:54:05 +02:00
card.c ALSA: usb-audio: Fix NULL pointer deference in try_to_register_card 2025-10-15 10:17:09 +02:00
card.h ALSA: usb-audio: Allow for rediscovery of connected USB SND devices 2025-04-11 13:02:31 +02:00
clock.c ALSA: usb-audio: Fix out of bounds reads when finding clock sources 2024-11-25 15:48:22 +01:00
clock.h ALSA: usb-audio: Constify audioformat pointer references 2020-11-23 15:15:36 +01:00
endpoint.c ALSA: usb-audio: Check max frame size for implicit feedback mode, too 2026-03-19 16:08:11 +01:00
endpoint.h ALSA: usb-audio: Remove unused function declaration 2023-08-01 16:56:57 +02:00
fcp.c ALSA: usb: fpc: replace kmalloc_array followed by copy_from_user with memdup_array_user 2025-10-07 14:14:32 +02:00
fcp.h ALSA: FCP: Add Focusrite Control Protocol driver 2025-01-18 12:00:38 +01:00
format.c ALSA: usb-audio: Improve Focusrite sample rate filtering 2026-03-19 16:08:31 +01:00
format.h ALSA: usb: initial USB Audio Device Class 3.0 support 2018-03-21 11:46:33 +01:00
helper.c ALSA: usb-audio: Export USB SND APIs for modules 2025-04-11 13:02:30 +02:00
helper.h ALSA: usb-audio: Support multiple control interfaces 2024-08-12 16:17:46 +02:00
implicit.c ALSA: usb-audio: Add implicit feedback quirk for RODE AI-1 2025-06-02 16:50:04 +02:00
implicit.h ALSA: usb-audio: Add new quirk FIXED_RATE for JBL Quantum810 Wireless 2022-12-22 09:13:54 +01:00
Kconfig ALSA: usb-audio: Add infrastructure for TASCAM US-144MKII 2025-08-15 17:53:47 +02:00
Makefile ALSA: usb-audio: qcom: Introduce QC USB SND offloading support 2025-04-11 13:02:32 +02:00
media.c ALSA: usb-audio: Replace manual mutex/spinlock with guard() 2025-08-12 08:36:17 +02:00
media.h media: sound/usb: Use Media Controller API to share media resources 2019-04-22 11:21:06 -04:00
midi.c Merge branch 'for-linus' into for-next 2025-09-28 08:34:58 +02:00
midi.h ALSA: usb-audio: Manage number of rawmidis globally 2023-05-23 12:11:00 +02:00
midi2.c ALSA: usb-audio: Replace manual mutex/spinlock with guard() 2025-08-12 08:36:17 +02:00
midi2.h ALSA: usb-audio: USB MIDI 2.0 UMP support 2023-05-23 12:11:02 +02:00
mixer.c ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free() 2026-01-30 10:32:23 +01:00
mixer.h ALSA: usb-audio: Add input value sanity checks for standard types 2024-08-06 18:27:08 +02:00
mixer_maps.c ALSA: usb-audio: Rename ALSA kcontrol PCM and PCM1 for the KTMicro sound card 2025-06-13 10:18:10 +02:00
mixer_quirks.c ALSA: usb-audio: fix broken logic in snd_audigy2nx_led_update() 2026-02-11 13:41:59 +01:00
mixer_quirks.h ALSA: usb-audio: Drop CONFIG_PM ifdefs 2021-12-06 10:19:40 +01:00
mixer_s1810c.c ALSA: usb-audio: presonus s18xx uses little-endian 2026-03-04 07:19:59 -05:00
mixer_s1810c.h ALSA: usb-audio: Add support for Presonus Studio 1810c 2020-02-15 09:46:16 +01:00
mixer_scarlett.c ALSA: usb-audio: Copy string more safely 2025-07-11 09:53:36 +02:00
mixer_scarlett.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mixer_scarlett2.c ALSA: usb-audio: Check endpoint numbers at parsing Scarlett2 mixer interfaces 2026-03-19 16:08:22 +01:00
mixer_scarlett2.h ALSA: scarlett2: Rename scarlett_gen2 to scarlett2 2023-10-27 11:22:59 +02:00
mixer_us16x08.c ALSA: usb-mixer: us16x08: validate meter packet indices 2026-01-02 12:56:58 +01:00
mixer_us16x08.h ALSA: usb: Constify snd_kcontrol_new items 2020-01-03 09:24:34 +01:00
pcm.c ALSA: usb-audio: Use the right limit for PCM OOB check 2026-02-11 13:42:01 +01:00
pcm.h ALSA: usb-audio: Export USB SND APIs for modules 2025-04-11 13:02:30 +02:00
power.c ALSA: usb-audio: Support multiple control interfaces 2024-08-12 16:17:46 +02:00
power.h ALSA: usb-audio: Support multiple control interfaces 2024-08-12 16:17:46 +02:00
proc.c ALSA: usb-audio: Replace manual mutex/spinlock with guard() 2025-08-12 08:36:17 +02:00
proc.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
quirks-table.h ALSA: usb-audio: Add Pioneer DJ DJM-V10 support 2025-04-22 15:00:48 +02:00
quirks.c ALSA: usb-audio: Avoid implicit feedback mode on DIYINHK USB Audio 2.0 2026-03-19 16:08:11 +01:00
quirks.h ALSA: usb-audio: improve module param quirk_flags 2025-09-28 08:35:29 +02:00
stream.c ALSA: usb-audio: Add QUIRK_FLAG_SKIP_IFACE_SETUP 2026-03-12 07:09:11 -04:00
stream.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
usbaudio.h ALSA: usb-audio: Add QUIRK_FLAG_SKIP_IFACE_SETUP 2026-03-12 07:09:11 -04:00
validate.c ALSA: usb-audio: Use correct version for UAC3 header validation 2026-03-12 07:09:38 -04:00