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b=Z2RmK1Qku+hrgRWJOieHk6ziX/Za6Yu3r7RV+08yxjxjlSfhOqVsN6YxDzpfUyG1vxE5S1 AOXO7MTCig7T44BA== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 8EFDB13931; Tue, 29 Apr 2025 18:35:31 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id AXWOIfMbEWjWQAAAD6G6ig (envelope-from ); Tue, 29 Apr 2025 18:35:31 +0000 Date: Tue, 29 Apr 2025 20:35:31 +0200 Message-ID: <87h626eryk.wl-tiwai@suse.de> From: Takashi Iwai To: Paul Davis Cc: Takashi Iwai , linux-sound@vger.kernel.org Subject: Re: ALSA USB MIDI port names are poorly constructed and truncate iJACK names In-Reply-To: References: <878qnss187.wl-tiwai@suse.de> <871ptjl6jk.wl-tiwai@suse.de> <87ikms1dkv.wl-tiwai@suse.de> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/27.2 Mule/6.0 Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: B28751F391 X-Spam-Score: -3.51 X-Rspamd-Action: no action X-Spamd-Result: default: False [-3.51 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; MIME_TRACE(0.00)[0:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; TO_DN_SOME(0.00)[]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,suse.de:mid,suse.de:email]; DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spam-Flag: NO X-Spam-Level: On Mon, 28 Apr 2025 22:36:30 +0200, Paul Davis wrote: > > I already included the examples from before and after upthread. You're right, I didn't check from the beginning of the thread carefully enough. > The tabs/spaces is my editor, not my mailer. I'm not I can be bothered > to fix it at this point (I'm set up to edit Ardour, not the kernel). > especially since you want the substreams renamed too. I should leave > it with you. OK, let me write up and submit the patch. thanks, Takashi > > On Fri, Apr 25, 2025 at 9:10 AM Takashi Iwai wrote: > > > > On Fri, 25 Apr 2025 16:39:59 +0200, > > Paul Davis wrote: > > > > > > No, this is not correct. > > > > > > The number is only used when constructing a "default jack name" as in > > > "SHORT_DEVICE_NAME MIDI NUMBER". It is never used when the jack name > > > is given by the manufacturer. > > > > > > In the case of the Midisport 2x2, for example, the manufacturer does > > > not provide jack names, and so we create "Midisport 2x2 MIDI 1" and > > > "Midisport 2x2 MIDI 2". You can see this in the example output I > > > provided. > > > > > > If the manufacturer has provided the jack name, the code already > > > assumed that the jack names will be unique (because otherwise things > > > would just break on Windows and macOS, and because they bothered to > > > provide names). And if the jack name includes the product name, even > > > more reason to continue with this assumption. > > > > Ah OK, now it's clearer. In anyway, if you give the result after your > > patch for comparison, it'll give a better demonstration. > > > > But another point about the predefined port_info is still valid, I > > suppose. snd_usbmidi_port_info[] provides the own format strings, and > > they are all like "%s Tone Generator", where "%s" should be filled > > with the shortname, and not jack_name. > > > > So, when port_info is defined, we should skip the duplicated word > > check. That being said, the change can be something like: > > > > -- 8< -- > > --- a/sound/usb/midi.c > > +++ b/sound/usb/midi.c > > @@ -1885,10 +1885,18 @@ static void snd_usbmidi_init_substream(struct snd_usb_midi *umidi, > > } > > > > port_info = find_port_info(umidi, number); > > - name_format = port_info ? port_info->name : > > - (jack_name != default_jack_name ? "%s %s" : "%s %s %d"); > > - snprintf(substream->name, sizeof(substream->name), > > - name_format, umidi->card->shortname, jack_name, number + 1); > > + if (port_info || jack_name == default_jack_name || > > + strncmp(umidi->card->shortname, jack_name, strlen(umidi->card->shortname)) != 0) { > > + name_format = port_info ? port_info->name : > > + (jack_name != default_jack_name ? "%s %s" : "%s %s %d"); > > + snprintf(substream->name, sizeof(substream->name), > > + name_format, umidi->card->shortname, jack_name, number + 1); > > + } else { > > + /* The manufacturer included the iProduct name in the jack > > + * name, do not use both > > + */ > > + strscpy(substream->name, jack_name); > > + } > > > > *rsubstream = substream; > > } > > -- 8< -- > > > > > I realized after I sent the patch that I had run diff -uRN at the > > > wrong level of the source tree, but I did read the doc and other than > > > that, I think there were no other errors? I run a standard debian > > > kernel and so am not working with git. > > > > Indeed, the patch level isn't right, but the biggest problem is that > > tabs/spaces are broken (possibly due to your mailer), so it can't be > > applied as is, unfortunately. > > > > > > thanks, > > > > Takashi > > > > > On Wed, Apr 23, 2025 at 12:45 AM Takashi Iwai wrote: > > > > > > > > On Tue, 22 Apr 2025 19:31:59 +0200, > > > > Paul Davis wrote: > > > > > > > > > > This patch was developed using the Debian 6.12.12 kernel source, but I > > > > > believe it works without changes for current git. > > > > > > > > > > The approach taken is to always look for the iProduct name > > > > > (umidi->card->shortname) in the iJACK name (jack_name). If not found, > > > > > the code path is unchanged. If found, a different string format is > > > > > used to create the port name, using only the jack name. Note that > > > > > since finding the product name in the jack name implies the jack name > > > > > is not default_jack_name, there is never any reason to use "number" in > > > > > constructing the port name. > > > > > > > > > > This generates the expected port names for several USB MIDI devices > > > > > here, some of which have "product name in jack name" and some which do > > > > > not: > > > > > > > > > > % aplaymidi -l > > > > > Port Client name Port name > > > > > 14:0 Midi Through Midi Through Port-0 > > > > > 16:0 Scarlett 18i20 USB Scarlett 18i20 USB MIDI 1 > > > > > 36:0 Keystation 88 Keystation 88 MIDI 1 > > > > > 40:0 Launchkey MK4 49 Launchkey MK4 49 MIDI In > > > > > 40:1 Launchkey MK4 49 Launchkey MK4 49 DAW In > > > > > 44:0 MidiSport 2x2 MidiSport 2x2 MIDI 1 > > > > > 44:1 MidiSport 2x2 MidiSport 2x2 MIDI 2 > > > > > > > > > > > > > > > Signed-off-by: Paul Davis > > > > > > > > > > --- midi.c.orig 2025-04-22 11:20:30.192338737 -0600 > > > > > +++ midi.c 2025-04-22 11:20:47.373155820 -0600 > > > > > @@ -1817,10 +1817,18 @@ static void snd_usbmidi_init_substream(s > > > > > } > > > > > > > > > > port_info = find_port_info(umidi, number); > > > > > - name_format = port_info ? port_info->name : > > > > > - (jack_name != default_jack_name ? "%s %s" : "%s %s %d"); > > > > > - snprintf(substream->name, sizeof(substream->name), > > > > > - name_format, umidi->card->shortname, jack_name, number + 1); > > > > > + > > > > > + if (strncmp (umidi->card->shortname, jack_name, strlen > > > > > (umidi->card->shortname)) != 0) { > > > > > + name_format = port_info ? port_info->name : > > > > > + (jack_name != default_jack_name ? "%s %s" : "%s %s %d"); > > > > > + snprintf(substream->name, sizeof(substream->name), > > > > > + name_format, umidi->card->shortname, jack_name, number + 1); > > > > > + } else { > > > > > + /* The manufacturer included the iProduct name in the jack > > > > > name, do not use both */ > > > > > + name_format = port_info ? port_info->name : "%s"; > > > > > + snprintf(substream->name, sizeof(substream->name), > > > > > name_format, jack_name); > > > > > + } > > > > > > > > Thanks for the patch. > > > > > > > > However, dropping the number suffix will break the uniqueness. > > > > For example, in your case above, MidiSport 2x2 will have two identical > > > > port names, I suppose? > > > > > > > > IMO, we should keep adding the suffix number unless the uniqueness is > > > > guaranteed instead of blindly dropping. Admittedly the current code > > > > isn't in the best form and this also needs more modification, too. > > > > > > > > Also, the pre-defined port names defined in snd_usb_midi_port_info[] > > > > have the format like "%s Synth", too, and those should be adjusted, as > > > > well. > > > > > > > > Last but not least, after we get a final form, could you try to submit > > > > a patch in the proper format as defined in > > > > Documentation/process/submitting-patches.rst? > > > > > > > > > > > > thanks, > > > > > > > > Takashi >