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usb: gadget: midi2: Fix incorrect default MIDI2 protocol setup

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commit 3eb27d3e32 upstream.

The MIDI2 gadget driver handled the default MIDI protocol version
incorrectly due to the confusion of the protocol version passed via
configfs (either 1 or 2) and UMP protocol bits (0x100 / 0x200).
As a consequence, the default protocol always resulted in MIDI1.

This patch addresses the misunderstanding of the protocol handling.

Fixes: 29ee7a4ddd ("usb: gadget: midi2: Add configfs support")
Cc: stable <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20240708095719.25627-1-tiwai@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai 2024-07-08 11:57:17 +02:00 committed by Greg Kroah-Hartman
parent 82c94e6a7b
commit 0c77797849
1 changed files with 11 additions and 8 deletions
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19
drivers/usb/gadget/function/f_midi2.c
View File

@ -150,6 +150,9 @@ struct f_midi2 {
#define func_to_midi2(f) container_of(f, struct f_midi2, func)
/* convert from MIDI protocol number (1 or 2) to SNDRV_UMP_EP_INFO_PROTO_* */
#define to_ump_protocol(v) (((v) & 3) << 8)
/* get EP name string */
static const char *ump_ep_name(const struct f_midi2_ep *ep)
{
@ -564,8 +567,7 @@ static void reply_ump_stream_ep_config(struct f_midi2_ep *ep)
.status = UMP_STREAM_MSG_STATUS_STREAM_CFG,
};
if ((ep->info.protocol & SNDRV_UMP_EP_INFO_PROTO_MIDI_MASK) ==
SNDRV_UMP_EP_INFO_PROTO_MIDI2)
if (ep->info.protocol == 2)
rep.protocol = UMP_STREAM_MSG_EP_INFO_CAP_MIDI2 >> 8;
else
rep.protocol = UMP_STREAM_MSG_EP_INFO_CAP_MIDI1 >> 8;
@ -627,13 +629,13 @@ static void process_ump_stream_msg(struct f_midi2_ep *ep, const u32 *data)
return;
case UMP_STREAM_MSG_STATUS_STREAM_CFG_REQUEST:
if (*data & UMP_STREAM_MSG_EP_INFO_CAP_MIDI2) {
ep->info.protocol = SNDRV_UMP_EP_INFO_PROTO_MIDI2;
ep->info.protocol = 2;
DBG(midi2, "Switching Protocol to MIDI2\n");
} else {
ep->info.protocol = SNDRV_UMP_EP_INFO_PROTO_MIDI1;
ep->info.protocol = 1;
DBG(midi2, "Switching Protocol to MIDI1\n");
}
snd_ump_switch_protocol(ep->ump, ep->info.protocol);
snd_ump_switch_protocol(ep->ump, to_ump_protocol(ep->info.protocol));
reply_ump_stream_ep_config(ep);
return;
case UMP_STREAM_MSG_STATUS_FB_DISCOVERY:
@ -1065,7 +1067,8 @@ static void f_midi2_midi1_ep_out_complete(struct usb_ep *usb_ep,
group = midi2->out_cable_mapping[cable].group;
bytes = midi1_packet_bytes[*buf & 0x0f];
for (c = 0; c < bytes; c++) {
snd_ump_convert_to_ump(cvt, group, ep->info.protocol,
snd_ump_convert_to_ump(cvt, group,
to_ump_protocol(ep->info.protocol),
buf[c + 1]);
if (cvt->ump_bytes) {
snd_ump_receive(ep->ump, cvt->ump,
@ -1375,7 +1378,7 @@ static void assign_block_descriptors(struct f_midi2 *midi2,
desc->nNumGroupTrm = b->num_groups;
desc->iBlockItem = ep->blks[blk].string_id;
if (ep->info.protocol & SNDRV_UMP_EP_INFO_PROTO_MIDI2)
if (ep->info.protocol == 2)
desc->bMIDIProtocol = USB_MS_MIDI_PROTO_2_0;
else
desc->bMIDIProtocol = USB_MS_MIDI_PROTO_1_0_128;
@ -1552,7 +1555,7 @@ static int f_midi2_create_card(struct f_midi2 *midi2)
if (midi2->info.static_block)
ump->info.flags |= SNDRV_UMP_EP_INFO_STATIC_BLOCKS;
ump->info.protocol_caps = (ep->info.protocol_caps & 3) << 8;
ump->info.protocol = (ep->info.protocol & 3) << 8;
ump->info.protocol = to_ump_protocol(ep->info.protocol);
ump->info.version = 0x0101;
ump->info.family_id = ep->info.family;
ump->info.model_id = ep->info.model;