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midi2.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MIDI 2.0 support
*/
#include <linux/bitops.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/wait.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/usb/audio.h>
#include <linux/usb/midi.h>
#include <linux/usb/midi-v2.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/ump.h>
#include "usbaudio.h"
#include "midi.h"
#include "midi2.h"
#include "helper.h"
static bool midi2_enable = true;
module_param(midi2_enable, bool, 0444);
MODULE_PARM_DESC(midi2_enable, "Enable MIDI 2.0 support.");
static bool midi2_ump_probe = true;
module_param(midi2_ump_probe, bool, 0444);
MODULE_PARM_DESC(midi2_ump_probe, "Probe UMP v1.1 support at first.");
/* stream direction; just shorter names */
enum {
STR_OUT = SNDRV_RAWMIDI_STREAM_OUTPUT,
STR_IN = SNDRV_RAWMIDI_STREAM_INPUT
};
#define NUM_URBS 8
struct snd_usb_midi2_urb;
struct snd_usb_midi2_endpoint;
struct snd_usb_midi2_ump;
struct snd_usb_midi2_interface;
/* URB context */
struct snd_usb_midi2_urb {
struct urb *urb;
struct snd_usb_midi2_endpoint *ep;
unsigned int index; /* array index */
};
/* A USB MIDI input/output endpoint */
struct snd_usb_midi2_endpoint {
struct usb_device *dev;
const struct usb_ms20_endpoint_descriptor *ms_ep; /* reference to EP descriptor */
struct snd_usb_midi2_endpoint *pair; /* bidirectional pair EP */
struct snd_usb_midi2_ump *rmidi; /* assigned UMP EP pair */
struct snd_ump_endpoint *ump; /* assigned UMP EP */
int direction; /* direction (STR_IN/OUT) */
unsigned int endpoint; /* EP number */
unsigned int pipe; /* URB pipe */
unsigned int packets; /* packet buffer size in bytes */
unsigned int interval; /* interval for INT EP */
wait_queue_head_t wait; /* URB waiter */
spinlock_t lock; /* URB locking */
struct snd_rawmidi_substream *substream; /* NULL when closed */
unsigned int num_urbs; /* number of allocated URBs */
unsigned long urb_free; /* bitmap for free URBs */
unsigned long urb_free_mask; /* bitmask for free URBs */
atomic_t running; /* running status */
atomic_t suspended; /* saved running status for suspend */
bool disconnected; /* shadow of umidi->disconnected */
struct list_head list; /* list to umidi->ep_list */
struct snd_usb_midi2_urb urbs[NUM_URBS];
};
/* A UMP endpoint - one or two USB MIDI endpoints are assigned */
struct snd_usb_midi2_ump {
struct usb_device *dev;
struct snd_usb_midi2_interface *umidi; /* reference to MIDI iface */
struct snd_ump_endpoint *ump; /* assigned UMP EP object */
struct snd_usb_midi2_endpoint *eps[2]; /* USB MIDI endpoints */
int index; /* rawmidi device index */
unsigned char usb_block_id; /* USB GTB id used for finding a pair */
bool ump_parsed; /* Parsed UMP 1.1 EP/FB info*/
struct list_head list; /* list to umidi->rawmidi_list */
};
/* top-level instance per USB MIDI interface */
struct snd_usb_midi2_interface {
struct snd_usb_audio *chip; /* assigned USB-audio card */
struct usb_interface *iface; /* assigned USB interface */
struct usb_host_interface *hostif;
const char *blk_descs; /* group terminal block descriptors */
unsigned int blk_desc_size; /* size of GTB descriptors */
bool disconnected;
struct list_head ep_list; /* list of endpoints */
struct list_head rawmidi_list; /* list of UMP rawmidis */
struct list_head list; /* list to chip->midi_v2_list */
};
/* submit URBs as much as possible; used for both input and output */
static void do_submit_urbs_locked(struct snd_usb_midi2_endpoint *ep,
int (*prepare)(struct snd_usb_midi2_endpoint *,
struct urb *))
{
struct snd_usb_midi2_urb *ctx;
int index, err = 0;
if (ep->disconnected)
return;
while (ep->urb_free) {
index = find_first_bit(&ep->urb_free, ep->num_urbs);
if (index >= ep->num_urbs)
return;
ctx = &ep->urbs[index];
err = prepare(ep, ctx->urb);
if (err < 0)
return;
if (!ctx->urb->transfer_buffer_length)
return;
ctx->urb->dev = ep->dev;
err = usb_submit_urb(ctx->urb, GFP_ATOMIC);
if (err < 0) {
dev_dbg(&ep->dev->dev,
"usb_submit_urb error %d\n", err);
return;
}
clear_bit(index, &ep->urb_free);
}
}
/* prepare for output submission: copy from rawmidi buffer to urb packet */
static int prepare_output_urb(struct snd_usb_midi2_endpoint *ep,
struct urb *urb)
{
int count;
count = snd_ump_transmit(ep->ump, urb->transfer_buffer,
ep->packets);
if (count < 0) {
dev_dbg(&ep->dev->dev, "rawmidi transmit error %d\n", count);
return count;
}
cpu_to_le32_array((u32 *)urb->transfer_buffer, count >> 2);
urb->transfer_buffer_length = count;
return 0;
}
static void submit_output_urbs_locked(struct snd_usb_midi2_endpoint *ep)
{
do_submit_urbs_locked(ep, prepare_output_urb);
}
/* URB completion for output; re-filling and re-submit */
static void output_urb_complete(struct urb *urb)
{
struct snd_usb_midi2_urb *ctx = urb->context;
struct snd_usb_midi2_endpoint *ep = ctx->ep;
unsigned long flags;
spin_lock_irqsave(&ep->lock, flags);
set_bit(ctx->index, &ep->urb_free);
if (urb->status >= 0 && atomic_read(&ep->running))
submit_output_urbs_locked(ep);
if (ep->urb_free == ep->urb_free_mask)
wake_up(&ep->wait);
spin_unlock_irqrestore(&ep->lock, flags);
}
/* prepare for input submission: just set the buffer length */
static int prepare_input_urb(struct snd_usb_midi2_endpoint *ep,
struct urb *urb)
{
urb->transfer_buffer_length = ep->packets;
return 0;
}
static void submit_input_urbs_locked(struct snd_usb_midi2_endpoint *ep)
{
do_submit_urbs_locked(ep, prepare_input_urb);
}
/* URB completion for input; copy into rawmidi buffer and resubmit */
static void input_urb_complete(struct urb *urb)
{
struct snd_usb_midi2_urb *ctx = urb->context;
struct snd_usb_midi2_endpoint *ep = ctx->ep;
unsigned long flags;
int len;
spin_lock_irqsave(&ep->lock, flags);
if (ep->disconnected || urb->status < 0)
goto dequeue;
len = urb->actual_length;
len &= ~3; /* align UMP */
if (len > ep->packets)
len = ep->packets;
if (len > 0) {
le32_to_cpu_array((u32 *)urb->transfer_buffer, len >> 2);
snd_ump_receive(ep->ump, (u32 *)urb->transfer_buffer, len);
}
dequeue:
set_bit(ctx->index, &ep->urb_free);
submit_input_urbs_locked(ep);
if (ep->urb_free == ep->urb_free_mask)
wake_up(&ep->wait);
spin_unlock_irqrestore(&ep->lock, flags);
}
/* URB submission helper; for both direction */
static void submit_io_urbs(struct snd_usb_midi2_endpoint *ep)
{
unsigned long flags;
if (!ep)
return;
spin_lock_irqsave(&ep->lock, flags);
if (ep->direction == STR_IN)
submit_input_urbs_locked(ep);
else
submit_output_urbs_locked(ep);
spin_unlock_irqrestore(&ep->lock, flags);
}
/* kill URBs for close, suspend and disconnect */
static void kill_midi_urbs(struct snd_usb_midi2_endpoint *ep, bool suspending)
{
int i;
if (!ep)
return;
if (suspending)
ep->suspended = ep->running;
atomic_set(&ep->running, 0);
for (i = 0; i < ep->num_urbs; i++) {
if (!ep->urbs[i].urb)
break;
usb_kill_urb(ep->urbs[i].urb);
}
}
/* wait until all URBs get freed */
static void drain_urb_queue(struct snd_usb_midi2_endpoint *ep)
{
if (!ep)
return;
spin_lock_irq(&ep->lock);
atomic_set(&ep->running, 0);
wait_event_lock_irq_timeout(ep->wait,
ep->disconnected ||
ep->urb_free == ep->urb_free_mask,
ep->lock, msecs_to_jiffies(500));
spin_unlock_irq(&ep->lock);
}
/* release URBs for an EP */
static void free_midi_urbs(struct snd_usb_midi2_endpoint *ep)
{
struct snd_usb_midi2_urb *ctx;
int i;
if (!ep)
return;
for (i = 0; i < NUM_URBS; ++i) {
ctx = &ep->urbs[i];
if (!ctx->urb)
break;
usb_free_coherent(ep->dev, ep->packets,
ctx->urb->transfer_buffer,
ctx->urb->transfer_dma);
usb_free_urb(ctx->urb);
ctx->urb = NULL;
}
ep->num_urbs = 0;
}
/* allocate URBs for an EP */
/* the callers should handle allocation errors via free_midi_urbs() */
static int alloc_midi_urbs(struct snd_usb_midi2_endpoint *ep)
{
struct snd_usb_midi2_urb *ctx;
void (*comp)(struct urb *urb);
void *buffer;
int i, err;
int endpoint, len;
endpoint = ep->endpoint;
len = ep->packets;
if (ep->direction == STR_IN)
comp = input_urb_complete;
else
comp = output_urb_complete;
ep->num_urbs = 0;
ep->urb_free = ep->urb_free_mask = 0;
for (i = 0; i < NUM_URBS; i++) {
ctx = &ep->urbs[i];
ctx->index = i;
ctx->urb = usb_alloc_urb(0, GFP_KERNEL);
if (!ctx->urb) {
dev_err(&ep->dev->dev, "URB alloc failed\n");
return -ENOMEM;
}
ctx->ep = ep;
buffer = usb_alloc_coherent(ep->dev, len, GFP_KERNEL,
&ctx->urb->transfer_dma);
if (!buffer) {
dev_err(&ep->dev->dev,
"URB buffer alloc failed (size %d)\n", len);
return -ENOMEM;
}
if (ep->interval)
usb_fill_int_urb(ctx->urb, ep->dev, ep->pipe,
buffer, len, comp, ctx, ep->interval);
else
usb_fill_bulk_urb(ctx->urb, ep->dev, ep->pipe,
buffer, len, comp, ctx);
err = usb_urb_ep_type_check(ctx->urb);
if (err < 0) {
dev_err(&ep->dev->dev, "invalid MIDI EP %x\n",
endpoint);
return err;
}
ctx->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
ep->num_urbs++;
}
ep->urb_free = ep->urb_free_mask = GENMASK(ep->num_urbs - 1, 0);
return 0;
}
static struct snd_usb_midi2_endpoint *
ump_to_endpoint(struct snd_ump_endpoint *ump, int dir)
{
struct snd_usb_midi2_ump *rmidi = ump->private_data;
return rmidi->eps[dir];
}
/* ump open callback */
static int snd_usb_midi_v2_open(struct snd_ump_endpoint *ump, int dir)
{
struct snd_usb_midi2_endpoint *ep = ump_to_endpoint(ump, dir);
int err = 0;
if (!ep || !ep->endpoint)
return -ENODEV;
if (ep->disconnected)
return -EIO;
if (ep->direction == STR_OUT) {
err = alloc_midi_urbs(ep);
if (err) {
free_midi_urbs(ep);
return err;
}
}
return 0;
}
/* ump close callback */
static void snd_usb_midi_v2_close(struct snd_ump_endpoint *ump, int dir)
{
struct snd_usb_midi2_endpoint *ep = ump_to_endpoint(ump, dir);
if (ep->direction == STR_OUT) {
kill_midi_urbs(ep, false);
drain_urb_queue(ep);
free_midi_urbs(ep);
}
}
/* ump trigger callback */
static void snd_usb_midi_v2_trigger(struct snd_ump_endpoint *ump, int dir,
int up)
{
struct snd_usb_midi2_endpoint *ep = ump_to_endpoint(ump, dir);
atomic_set(&ep->running, up);
if (up && ep->direction == STR_OUT && !ep->disconnected)
submit_io_urbs(ep);
}
/* ump drain callback */
static void snd_usb_midi_v2_drain(struct snd_ump_endpoint *ump, int dir)
{
struct snd_usb_midi2_endpoint *ep = ump_to_endpoint(ump, dir);
drain_urb_queue(ep);
}
/* allocate and start all input streams */
static int start_input_streams(struct snd_usb_midi2_interface *umidi)
{
struct snd_usb_midi2_endpoint *ep;
int err;
list_for_each_entry(ep, &umidi->ep_list, list) {
if (ep->direction == STR_IN) {
err = alloc_midi_urbs(ep);
if (err < 0)
goto error;
}
}
list_for_each_entry(ep, &umidi->ep_list, list) {
if (ep->direction == STR_IN)
submit_io_urbs(ep);
}
return 0;
error:
list_for_each_entry(ep, &umidi->ep_list, list) {
if (ep->direction == STR_IN)
free_midi_urbs(ep);
}
return err;
}
static const struct snd_ump_ops snd_usb_midi_v2_ump_ops = {
.open = snd_usb_midi_v2_open,
.close = snd_usb_midi_v2_close,
.trigger = snd_usb_midi_v2_trigger,
.drain = snd_usb_midi_v2_drain,
};
/* create a USB MIDI 2.0 endpoint object */
static int create_midi2_endpoint(struct snd_usb_midi2_interface *umidi,
struct usb_host_endpoint *hostep,
const struct usb_ms20_endpoint_descriptor *ms_ep)
{
struct snd_usb_midi2_endpoint *ep;
int endpoint, dir;
usb_audio_dbg(umidi->chip, "Creating an EP 0x%02x, #GTB=%d\n",
hostep->desc.bEndpointAddress,
ms_ep->bNumGrpTrmBlock);
ep = kzalloc(sizeof(*ep), GFP_KERNEL);
if (!ep)
return -ENOMEM;
spin_lock_init(&ep->lock);
init_waitqueue_head(&ep->wait);
ep->dev = umidi->chip->dev;
endpoint = hostep->desc.bEndpointAddress;
dir = (endpoint & USB_DIR_IN) ? STR_IN : STR_OUT;
ep->endpoint = endpoint;
ep->direction = dir;
ep->ms_ep = ms_ep;
if (usb_endpoint_xfer_int(&hostep->desc))
ep->interval = hostep->desc.bInterval;
else
ep->interval = 0;
if (dir == STR_IN) {
if (ep->interval)
ep->pipe = usb_rcvintpipe(ep->dev, endpoint);
else
ep->pipe = usb_rcvbulkpipe(ep->dev, endpoint);
} else {
if (ep->interval)
ep->pipe = usb_sndintpipe(ep->dev, endpoint);
else
ep->pipe = usb_sndbulkpipe(ep->dev, endpoint);
}
ep->packets = usb_maxpacket(ep->dev, ep->pipe);
list_add_tail(&ep->list, &umidi->ep_list);
return 0;
}
/* destructor for endpoint; from snd_usb_midi_v2_free() */
static void free_midi2_endpoint(struct snd_usb_midi2_endpoint *ep)
{
list_del(&ep->list);
free_midi_urbs(ep);
kfree(ep);
}
/* call all endpoint destructors */
static void free_all_midi2_endpoints(struct snd_usb_midi2_interface *umidi)
{
struct snd_usb_midi2_endpoint *ep;
while (!list_empty(&umidi->ep_list)) {
ep = list_first_entry(&umidi->ep_list,
struct snd_usb_midi2_endpoint, list);
free_midi2_endpoint(ep);
}
}
/* find a MIDI STREAMING descriptor with a given subtype */
static void *find_usb_ms_endpoint_descriptor(struct usb_host_endpoint *hostep,
unsigned char subtype)
{
unsigned char *extra = hostep->extra;
int extralen = hostep->extralen;
while (extralen > 3) {
struct usb_ms_endpoint_descriptor *ms_ep =
(struct usb_ms_endpoint_descriptor *)extra;
if (ms_ep->bLength > 3 &&
ms_ep->bDescriptorType == USB_DT_CS_ENDPOINT &&
ms_ep->bDescriptorSubtype == subtype)
return ms_ep;
if (!extra[0])
break;
extralen -= extra[0];
extra += extra[0];
}
return NULL;
}
/* get the full group terminal block descriptors and return the size */
static int get_group_terminal_block_descs(struct snd_usb_midi2_interface *umidi)
{
struct usb_host_interface *hostif = umidi->hostif;
struct usb_device *dev = umidi->chip->dev;
struct usb_ms20_gr_trm_block_header_descriptor header = { 0 };
unsigned char *data;
int err, size;
err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR,
USB_RECIP_INTERFACE | USB_TYPE_STANDARD | USB_DIR_IN,
USB_DT_CS_GR_TRM_BLOCK << 8 | hostif->desc.bAlternateSetting,
hostif->desc.bInterfaceNumber,
&header, sizeof(header));
if (err < 0)
return err;
size = __le16_to_cpu(header.wTotalLength);
if (!size) {
dev_err(&dev->dev, "Failed to get GTB descriptors for %d:%d\n",
hostif->desc.bInterfaceNumber, hostif->desc.bAlternateSetting);
return -EINVAL;
}
data = kzalloc(size, GFP_KERNEL);
if (!data)
return -ENOMEM;
err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR,
USB_RECIP_INTERFACE | USB_TYPE_STANDARD | USB_DIR_IN,
USB_DT_CS_GR_TRM_BLOCK << 8 | hostif->desc.bAlternateSetting,
hostif->desc.bInterfaceNumber, data, size);
if (err < 0) {
kfree(data);
return err;
}
umidi->blk_descs = data;
umidi->blk_desc_size = size;
return 0;
}
/* find the corresponding group terminal block descriptor */
static const struct usb_ms20_gr_trm_block_descriptor *
find_group_terminal_block(struct snd_usb_midi2_interface *umidi, int id)
{
const unsigned char *data = umidi->blk_descs;
int size = umidi->blk_desc_size;
const struct usb_ms20_gr_trm_block_descriptor *desc;
size -= sizeof(struct usb_ms20_gr_trm_block_header_descriptor);
data += sizeof(struct usb_ms20_gr_trm_block_header_descriptor);
while (size > 0 && *data && *data <= size) {
desc = (const struct usb_ms20_gr_trm_block_descriptor *)data;
if (desc->bLength >= sizeof(*desc) &&
desc->bDescriptorType == USB_DT_CS_GR_TRM_BLOCK &&
desc->bDescriptorSubtype == USB_MS_GR_TRM_BLOCK &&
desc->bGrpTrmBlkID == id)
return desc;
size -= *data;
data += *data;
}
return NULL;
}
/* fill up the information from GTB */
static int parse_group_terminal_block(struct snd_usb_midi2_ump *rmidi,
const struct usb_ms20_gr_trm_block_descriptor *desc)
{
struct snd_ump_endpoint *ump = rmidi->ump;
unsigned int protocol, protocol_caps;
/* set default protocol */
switch (desc->bMIDIProtocol) {
case USB_MS_MIDI_PROTO_1_0_64:
case USB_MS_MIDI_PROTO_1_0_64_JRTS:
case USB_MS_MIDI_PROTO_1_0_128:
case USB_MS_MIDI_PROTO_1_0_128_JRTS:
protocol = SNDRV_UMP_EP_INFO_PROTO_MIDI1;
break;
case USB_MS_MIDI_PROTO_2_0:
case USB_MS_MIDI_PROTO_2_0_JRTS:
protocol = SNDRV_UMP_EP_INFO_PROTO_MIDI2;
break;
default:
return 0;
}
if (ump->info.protocol && ump->info.protocol != protocol)
usb_audio_info(rmidi->umidi->chip,
"Overriding preferred MIDI protocol in GTB %d: %x -> %x\n",
rmidi->usb_block_id, ump->info.protocol,
protocol);
ump->info.protocol = protocol;
protocol_caps = protocol;
switch (desc->bMIDIProtocol) {
case USB_MS_MIDI_PROTO_1_0_64_JRTS:
case USB_MS_MIDI_PROTO_1_0_128_JRTS:
case USB_MS_MIDI_PROTO_2_0_JRTS:
protocol_caps |= SNDRV_UMP_EP_INFO_PROTO_JRTS_TX |
SNDRV_UMP_EP_INFO_PROTO_JRTS_RX;
break;
}
if (ump->info.protocol_caps && ump->info.protocol_caps != protocol_caps)
usb_audio_info(rmidi->umidi->chip,
"Overriding MIDI protocol caps in GTB %d: %x -> %x\n",
rmidi->usb_block_id, ump->info.protocol_caps,
protocol_caps);
ump->info.protocol_caps = protocol_caps;
return 0;
}
/* allocate and parse for each assigned group terminal block */
static int parse_group_terminal_blocks(struct snd_usb_midi2_interface *umidi)
{
struct snd_usb_midi2_ump *rmidi;
const struct usb_ms20_gr_trm_block_descriptor *desc;
int err;
err = get_group_terminal_block_descs(umidi);
if (err < 0)
return err;
if (!umidi->blk_descs)
return 0;
list_for_each_entry(rmidi, &umidi->rawmidi_list, list) {
desc = find_group_terminal_block(umidi, rmidi->usb_block_id);
if (!desc)
continue;
err = parse_group_terminal_block(rmidi, desc);
if (err < 0)
return err;
}
return 0;
}
/* parse endpoints included in the given interface and create objects */
static int parse_midi_2_0_endpoints(struct snd_usb_midi2_interface *umidi)
{
struct usb_host_interface *hostif = umidi->hostif;
struct usb_host_endpoint *hostep;
struct usb_ms20_endpoint_descriptor *ms_ep;
int i, err;
for (i = 0; i < hostif->desc.bNumEndpoints; i++) {
hostep = &hostif->endpoint[i];
if (!usb_endpoint_xfer_bulk(&hostep->desc) &&
!usb_endpoint_xfer_int(&hostep->desc))
continue;
ms_ep = find_usb_ms_endpoint_descriptor(hostep, USB_MS_GENERAL_2_0);
if (!ms_ep)
continue;
if (ms_ep->bLength <= sizeof(*ms_ep))
continue;
if (!ms_ep->bNumGrpTrmBlock)
continue;
if (ms_ep->bLength < sizeof(*ms_ep) + ms_ep->bNumGrpTrmBlock)
continue;
err = create_midi2_endpoint(umidi, hostep, ms_ep);
if (err < 0)
return err;
}
return 0;
}
static void free_all_midi2_umps(struct snd_usb_midi2_interface *umidi)
{
struct snd_usb_midi2_ump *rmidi;
while (!list_empty(&umidi->rawmidi_list)) {
rmidi = list_first_entry(&umidi->rawmidi_list,
struct snd_usb_midi2_ump, list);
list_del(&rmidi->list);
kfree(rmidi);
}
}
static int create_midi2_ump(struct snd_usb_midi2_interface *umidi,
struct snd_usb_midi2_endpoint *ep_in,
struct snd_usb_midi2_endpoint *ep_out,
int blk_id)
{
struct snd_usb_midi2_ump *rmidi;
struct snd_ump_endpoint *ump;
int input, output;
char idstr[16];
int err;
rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
if (!rmidi)
return -ENOMEM;
INIT_LIST_HEAD(&rmidi->list);
rmidi->dev = umidi->chip->dev;
rmidi->umidi = umidi;
rmidi->usb_block_id = blk_id;
rmidi->index = umidi->chip->num_rawmidis;
snprintf(idstr, sizeof(idstr), "UMP %d", rmidi->index);
input = ep_in ? 1 : 0;
output = ep_out ? 1 : 0;
err = snd_ump_endpoint_new(umidi->chip->card, idstr, rmidi->index,
output, input, &ump);
if (err < 0) {
usb_audio_dbg(umidi->chip, "Failed to create a UMP object\n");
kfree(rmidi);
return err;
}
rmidi->ump = ump;
umidi->chip->num_rawmidis++;
ump->private_data = rmidi;
ump->ops = &snd_usb_midi_v2_ump_ops;
rmidi->eps[STR_IN] = ep_in;
rmidi->eps[STR_OUT] = ep_out;
if (ep_in) {
ep_in->pair = ep_out;
ep_in->rmidi = rmidi;
ep_in->ump = ump;
}
if (ep_out) {
ep_out->pair = ep_in;
ep_out->rmidi = rmidi;
ep_out->ump = ump;
}
list_add_tail(&rmidi->list, &umidi->rawmidi_list);
return 0;
}
/* find the UMP EP with the given USB block id */
static struct snd_usb_midi2_ump *
find_midi2_ump(struct snd_usb_midi2_interface *umidi, int blk_id)
{
struct snd_usb_midi2_ump *rmidi;
list_for_each_entry(rmidi, &umidi->rawmidi_list, list) {
if (rmidi->usb_block_id == blk_id)
return rmidi;
}
return NULL;
}
/* look for the matching output endpoint and create UMP object if found */
static int find_matching_ep_partner(struct snd_usb_midi2_interface *umidi,
struct snd_usb_midi2_endpoint *ep,
int blk_id)
{
struct snd_usb_midi2_endpoint *pair_ep;
int blk;
usb_audio_dbg(umidi->chip, "Looking for a pair for EP-in 0x%02x\n",
ep->endpoint);
list_for_each_entry(pair_ep, &umidi->ep_list, list) {
if (pair_ep->direction != STR_OUT)
continue;
if (pair_ep->pair)
continue; /* already paired */
for (blk = 0; blk < pair_ep->ms_ep->bNumGrpTrmBlock; blk++) {
if (pair_ep->ms_ep->baAssoGrpTrmBlkID[blk] == blk_id) {
usb_audio_dbg(umidi->chip,
"Found a match with EP-out 0x%02x blk %d\n",
pair_ep->endpoint, blk);
return create_midi2_ump(umidi, ep, pair_ep, blk_id);
}
}
}
return 0;
}
/* Call UMP helper to parse UMP endpoints;
* this needs to be called after starting the input streams for bi-directional
* communications
*/
static int parse_ump_endpoints(struct snd_usb_midi2_interface *umidi)
{
struct snd_usb_midi2_ump *rmidi;
int err;
list_for_each_entry(rmidi, &umidi->rawmidi_list, list) {
if (!rmidi->ump ||
!(rmidi->ump->core.info_flags & SNDRV_RAWMIDI_INFO_DUPLEX))
continue;
err = snd_ump_parse_endpoint(rmidi->ump);
if (!err) {
rmidi->ump_parsed = true;
} else {
if (err == -ENOMEM)
return err;
/* fall back to GTB later */
}
}
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_parsed || rmidi->ump->info.num_blocks)
continue;
/* GTB is static-only */
rmidi->ump->info.flags |= SNDRV_UMP_EP_INFO_STATIC_BLOCKS;
/* 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;
}
/* attach legacy rawmidis */
static int attach_legacy_rawmidi(struct snd_usb_midi2_interface *umidi)
{
#if IS_ENABLED(CONFIG_SND_UMP_LEGACY_RAWMIDI)
struct snd_usb_midi2_ump *rmidi;
int err;
list_for_each_entry(rmidi, &umidi->rawmidi_list, list) {
err = snd_ump_attach_legacy_rawmidi(rmidi->ump,
"Legacy MIDI",
umidi->chip->num_rawmidis);
if (err < 0)
return err;
umidi->chip->num_rawmidis++;
}
#endif
return 0;
}
static void snd_usb_midi_v2_free(struct snd_usb_midi2_interface *umidi)
{
free_all_midi2_endpoints(umidi);
free_all_midi2_umps(umidi);
list_del(&umidi->list);
kfree(umidi->blk_descs);
kfree(umidi);
}
/* parse the interface for MIDI 2.0 */
static int parse_midi_2_0(struct snd_usb_midi2_interface *umidi)
{
struct snd_usb_midi2_endpoint *ep;
int blk, id, err;
/* First, create an object for each USB MIDI Endpoint */
err = parse_midi_2_0_endpoints(umidi);
if (err < 0)
return err;
if (list_empty(&umidi->ep_list)) {
usb_audio_warn(umidi->chip, "No MIDI endpoints found\n");
return -ENODEV;
}
/*
* Next, look for EP I/O pairs that are found in group terminal blocks
* A UMP object is created for each EP I/O pair as bidirecitonal
* UMP EP
*/
list_for_each_entry(ep, &umidi->ep_list, list) {
/* only input in this loop; output is matched in find_midi_ump() */
if (ep->direction != STR_IN)
continue;
for (blk = 0; blk < ep->ms_ep->bNumGrpTrmBlock; blk++) {
id = ep->ms_ep->baAssoGrpTrmBlkID[blk];
err = find_matching_ep_partner(umidi, ep, id);
if (err < 0)
return err;
}
}
/*
* For the remaining EPs, treat as singles, create a UMP object with
* unidirectional EP
*/
list_for_each_entry(ep, &umidi->ep_list, list) {
if (ep->rmidi)
continue; /* already paired */
for (blk = 0; blk < ep->ms_ep->bNumGrpTrmBlock; blk++) {
id = ep->ms_ep->baAssoGrpTrmBlkID[blk];
if (find_midi2_ump(umidi, id))
continue;
usb_audio_dbg(umidi->chip,
"Creating a unidirection UMP for EP=0x%02x, blk=%d\n",
ep->endpoint, id);
if (ep->direction == STR_IN)
err = create_midi2_ump(umidi, ep, NULL, id);
else
err = create_midi2_ump(umidi, NULL, ep, id);
if (err < 0)
return err;
break;
}
}
return 0;
}
/* is the given interface for MIDI 2.0? */
static bool is_midi2_altset(struct usb_host_interface *hostif)