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Tue, 23 May 2023 07:54:06 +0000 From: Takashi Iwai To: alsa-devel@alsa-project.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH v2 12/37] ALSA: usb-audio: Create UMP blocks from USB MIDI GTBs Date: Tue, 23 May 2023 09:53:33 +0200 Message-Id: <20230523075358.9672-13-tiwai@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230523075358.9672-1-tiwai@suse.de> References: <20230523075358.9672-1-tiwai@suse.de> MIME-Version: 1.0 Message-ID-Hash: FQ65URMLWP7I7NG3YCHMEPSG6BHEWKU6 X-Message-ID-Hash: FQ65URMLWP7I7NG3YCHMEPSG6BHEWKU6 X-MailFrom: tiwai@suse.de X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: <> List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: USB MIDI spec defines the Group Terminal Blocks (GTB) that associate multiple UMP Groups. Those correspond to snd_ump_block entities in ALSA UMP abstraction, and now we create those UMP Block objects for each UMP Endpoint from the parsed GTB information. Reviewed-by: Jaroslav Kysela Signed-off-by: Takashi Iwai --- sound/usb/midi2.c | 100 +++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 94 insertions(+), 6 deletions(-) diff --git a/sound/usb/midi2.c b/sound/usb/midi2.c index 790e4cd5d35c..5ffee06ac746 100644 --- a/sound/usb/midi2.c +++ b/sound/usb/midi2.c @@ -599,14 +599,8 @@ find_group_terminal_block(struct snd_usb_midi2_interface *umidi, int id) static int parse_group_terminal_block(struct snd_usb_midi2_ump *rmidi, const struct usb_ms20_gr_trm_block_descriptor *desc) { - struct snd_usb_audio *chip = rmidi->umidi->chip; struct snd_ump_endpoint *ump = rmidi->ump; - usb_audio_dbg(chip, - "GTB id %d: groups = %d / %d, type = %d\n", - desc->bGrpTrmBlkID, desc->nGroupTrm, desc->nNumGroupTrm, - desc->bGrpTrmBlkType); - /* set default protocol */ switch (desc->bMIDIProtocol) { case USB_MS_MIDI_PROTO_1_0_64: @@ -798,6 +792,94 @@ static int find_matching_ep_partner(struct snd_usb_midi2_interface *umidi, return 0; } +/* create a UMP block from a GTB entry */ +static int create_gtb_block(struct snd_usb_midi2_ump *rmidi, int dir, int blk) +{ + struct snd_usb_midi2_interface *umidi = rmidi->umidi; + const struct usb_ms20_gr_trm_block_descriptor *desc; + struct snd_ump_block *fb; + int type, err; + + desc = find_group_terminal_block(umidi, blk); + if (!desc) + return 0; + + usb_audio_dbg(umidi->chip, + "GTB %d: type=%d, group=%d/%d, protocol=%d, in bw=%d, out bw=%d\n", + blk, desc->bGrpTrmBlkType, desc->nGroupTrm, + desc->nNumGroupTrm, desc->bMIDIProtocol, + __le16_to_cpu(desc->wMaxInputBandwidth), + __le16_to_cpu(desc->wMaxOutputBandwidth)); + + /* assign the direction */ + switch (desc->bGrpTrmBlkType) { + case USB_MS_GR_TRM_BLOCK_TYPE_BIDIRECTIONAL: + type = SNDRV_UMP_DIR_BIDIRECTION; + break; + case USB_MS_GR_TRM_BLOCK_TYPE_INPUT_ONLY: + type = SNDRV_UMP_DIR_INPUT; + break; + case USB_MS_GR_TRM_BLOCK_TYPE_OUTPUT_ONLY: + type = SNDRV_UMP_DIR_OUTPUT; + break; + default: + usb_audio_dbg(umidi->chip, "Unsupported GTB type %d\n", + desc->bGrpTrmBlkType); + return 0; /* unsupported */ + } + + /* guess work: set blk-1 as the (0-based) block ID */ + err = snd_ump_block_new(rmidi->ump, blk - 1, type, + desc->nGroupTrm, desc->nNumGroupTrm, + &fb); + if (err == -EBUSY) + return 0; /* already present */ + else if (err) + return err; + + if (desc->iBlockItem) + usb_string(rmidi->dev, desc->iBlockItem, + fb->info.name, sizeof(fb->info.name)); + + if (__le16_to_cpu(desc->wMaxInputBandwidth) == 1 || + __le16_to_cpu(desc->wMaxOutputBandwidth) == 1) + fb->info.flags |= SNDRV_UMP_BLOCK_IS_MIDI1 | + SNDRV_UMP_BLOCK_IS_LOWSPEED; + + usb_audio_dbg(umidi->chip, + "Created a UMP block %d from GTB, name=%s\n", + blk, fb->info.name); + return 0; +} + +/* Create UMP blocks for each UMP EP */ +static int create_blocks_from_gtb(struct snd_usb_midi2_interface *umidi) +{ + struct snd_usb_midi2_ump *rmidi; + int i, blk, err, dir; + + list_for_each_entry(rmidi, &umidi->rawmidi_list, list) { + if (!rmidi->ump) + continue; + /* Blocks have been already created? */ + if (rmidi->ump->info.num_blocks) + continue; + /* loop over GTBs */ + for (dir = 0; dir < 2; dir++) { + if (!rmidi->eps[dir]) + continue; + for (i = 0; i < rmidi->eps[dir]->ms_ep->bNumGrpTrmBlock; i++) { + blk = rmidi->eps[dir]->ms_ep->baAssoGrpTrmBlkID[i]; + err = create_gtb_block(rmidi, dir, blk); + if (err < 0) + return err; + } + } + } + + return 0; +} + static void snd_usb_midi_v2_free(struct snd_usb_midi2_interface *umidi) { free_all_midi2_endpoints(umidi); @@ -1009,6 +1091,12 @@ int snd_usb_midi_v2_create(struct snd_usb_audio *chip, goto error; } + err = create_blocks_from_gtb(umidi); + if (err < 0) { + usb_audio_err(chip, "Failed to create GTB blocks\n"); + goto error; + } + set_fallback_rawmidi_names(umidi); return 0;