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ump.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Universal MIDI Packet (UMP) support
*/
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <sound/core.h>
#include <sound/rawmidi.h>
#include <sound/ump.h>
#include <sound/ump_convert.h>
#define ump_err(ump, fmt, args...) dev_err((ump)->core.dev, fmt, ##args)
#define ump_warn(ump, fmt, args...) dev_warn((ump)->core.dev, fmt, ##args)
#define ump_info(ump, fmt, args...) dev_info((ump)->core.dev, fmt, ##args)
#define ump_dbg(ump, fmt, args...) dev_dbg((ump)->core.dev, fmt, ##args)
static int snd_ump_dev_register(struct snd_rawmidi *rmidi);
static int snd_ump_dev_unregister(struct snd_rawmidi *rmidi);
static long snd_ump_ioctl(struct snd_rawmidi *rmidi, unsigned int cmd,
void __user *argp);
static void snd_ump_proc_read(struct snd_info_entry *entry,
struct snd_info_buffer *buffer);
static int snd_ump_rawmidi_open(struct snd_rawmidi_substream *substream);
static int snd_ump_rawmidi_close(struct snd_rawmidi_substream *substream);
static void snd_ump_rawmidi_trigger(struct snd_rawmidi_substream *substream,
int up);
static void snd_ump_rawmidi_drain(struct snd_rawmidi_substream *substream);
static void ump_handle_stream_msg(struct snd_ump_endpoint *ump,
const u32 *buf, int size);
#if IS_ENABLED(CONFIG_SND_UMP_LEGACY_RAWMIDI)
static int process_legacy_output(struct snd_ump_endpoint *ump,
u32 *buffer, int count);
static void process_legacy_input(struct snd_ump_endpoint *ump, const u32 *src,
int words);
#else
static inline int process_legacy_output(struct snd_ump_endpoint *ump,
u32 *buffer, int count)
{
return 0;
}
static inline void process_legacy_input(struct snd_ump_endpoint *ump,
const u32 *src, int words)
{
}
#endif
static const struct snd_rawmidi_global_ops snd_ump_rawmidi_ops = {
.dev_register = snd_ump_dev_register,
.dev_unregister = snd_ump_dev_unregister,
.ioctl = snd_ump_ioctl,
.proc_read = snd_ump_proc_read,
};
static const struct snd_rawmidi_ops snd_ump_rawmidi_input_ops = {
.open = snd_ump_rawmidi_open,
.close = snd_ump_rawmidi_close,
.trigger = snd_ump_rawmidi_trigger,
};
static const struct snd_rawmidi_ops snd_ump_rawmidi_output_ops = {
.open = snd_ump_rawmidi_open,
.close = snd_ump_rawmidi_close,
.trigger = snd_ump_rawmidi_trigger,
.drain = snd_ump_rawmidi_drain,
};
static void snd_ump_endpoint_free(struct snd_rawmidi *rmidi)
{
struct snd_ump_endpoint *ump = rawmidi_to_ump(rmidi);
struct snd_ump_block *fb;
while (!list_empty(&ump->block_list)) {
fb = list_first_entry(&ump->block_list, struct snd_ump_block,
list);
list_del(&fb->list);
if (fb->private_free)
fb->private_free(fb);
kfree(fb);
}
if (ump->private_free)
ump->private_free(ump);
#if IS_ENABLED(CONFIG_SND_UMP_LEGACY_RAWMIDI)
kfree(ump->out_cvts);
#endif
}
/**
* snd_ump_endpoint_new - create a UMP Endpoint object
* @card: the card instance
* @id: the id string for rawmidi
* @device: the device index for rawmidi
* @output: 1 for enabling output
* @input: 1 for enabling input
* @ump_ret: the pointer to store the new UMP instance
*
* Creates a new UMP Endpoint object. A UMP Endpoint is tied with one rawmidi
* instance with one input and/or one output rawmidi stream (either uni-
* or bi-directional). A UMP Endpoint may contain one or multiple UMP Blocks
* that consist of one or multiple UMP Groups.
*
* Use snd_rawmidi_set_ops() to set the operators to the new instance.
* Unlike snd_rawmidi_new(), this function sets up the info_flags by itself
* depending on the given @output and @input.
*
* The device has SNDRV_RAWMIDI_INFO_UMP flag set and a different device
* file ("umpCxDx") than a standard MIDI 1.x device ("midiCxDx") is
* created.
*
* Return: Zero if successful, or a negative error code on failure.
*/
int snd_ump_endpoint_new(struct snd_card *card, char *id, int device,
int output, int input,
struct snd_ump_endpoint **ump_ret)
{
unsigned int info_flags = SNDRV_RAWMIDI_INFO_UMP;
struct snd_ump_endpoint *ump;
int err;
if (input)
info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
if (output)
info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
if (input && output)
info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
ump = kzalloc(sizeof(*ump), GFP_KERNEL);
if (!ump)
return -ENOMEM;
INIT_LIST_HEAD(&ump->block_list);
mutex_init(&ump->open_mutex);
init_waitqueue_head(&ump->stream_wait);
#if IS_ENABLED(CONFIG_SND_UMP_LEGACY_RAWMIDI)
spin_lock_init(&ump->legacy_locks[0]);
spin_lock_init(&ump->legacy_locks[1]);
#endif
err = snd_rawmidi_init(&ump->core, card, id, device,
output, input, info_flags);
if (err < 0) {
snd_rawmidi_free(&ump->core);
return err;
}
ump->info.card = card->number;
ump->info.device = device;
ump->core.private_free = snd_ump_endpoint_free;
ump->core.ops = &snd_ump_rawmidi_ops;
if (input)
snd_rawmidi_set_ops(&ump->core, SNDRV_RAWMIDI_STREAM_INPUT,
&snd_ump_rawmidi_input_ops);
if (output)
snd_rawmidi_set_ops(&ump->core, SNDRV_RAWMIDI_STREAM_OUTPUT,
&snd_ump_rawmidi_output_ops);
ump_dbg(ump, "Created a UMP EP #%d (%s)\n", device, id);
*ump_ret = ump;
return 0;
}
EXPORT_SYMBOL_GPL(snd_ump_endpoint_new);
/*
* Device register / unregister hooks;
* do nothing, placeholders for avoiding the default rawmidi handling
*/
#if IS_ENABLED(CONFIG_SND_SEQUENCER)
static void snd_ump_dev_seq_free(struct snd_seq_device *device)
{
struct snd_ump_endpoint *ump = device->private_data;
ump->seq_dev = NULL;
}
#endif
static int snd_ump_dev_register(struct snd_rawmidi *rmidi)
{
#if IS_ENABLED(CONFIG_SND_SEQUENCER)
struct snd_ump_endpoint *ump = rawmidi_to_ump(rmidi);
int err;
err = snd_seq_device_new(ump->core.card, ump->core.device,
SNDRV_SEQ_DEV_ID_UMP, 0, &ump->seq_dev);
if (err < 0)
return err;
ump->seq_dev->private_data = ump;
ump->seq_dev->private_free = snd_ump_dev_seq_free;
snd_device_register(ump->core.card, ump->seq_dev);
#endif
return 0;
}
static int snd_ump_dev_unregister(struct snd_rawmidi *rmidi)
{
return 0;
}
static struct snd_ump_block *
snd_ump_get_block(struct snd_ump_endpoint *ump, unsigned char id)
{
struct snd_ump_block *fb;
list_for_each_entry(fb, &ump->block_list, list) {
if (fb->info.block_id == id)
return fb;
}
return NULL;
}
/*
* rawmidi ops for UMP endpoint
*/
static int snd_ump_rawmidi_open(struct snd_rawmidi_substream *substream)
{
struct snd_ump_endpoint *ump = rawmidi_to_ump(substream->rmidi);
int dir = substream->stream;
int err;
if (ump->substreams[dir])
return -EBUSY;
err = ump->ops->open(ump, dir);
if (err < 0)
return err;
ump->substreams[dir] = substream;
return 0;
}
static int snd_ump_rawmidi_close(struct snd_rawmidi_substream *substream)
{
struct snd_ump_endpoint *ump = rawmidi_to_ump(substream->rmidi);
int dir = substream->stream;
ump->substreams[dir] = NULL;
ump->ops->close(ump, dir);
return 0;
}
static void snd_ump_rawmidi_trigger(struct snd_rawmidi_substream *substream,
int up)
{
struct snd_ump_endpoint *ump = rawmidi_to_ump(substream->rmidi);
int dir = substream->stream;
ump->ops->trigger(ump, dir, up);
}
static void snd_ump_rawmidi_drain(struct snd_rawmidi_substream *substream)
{
struct snd_ump_endpoint *ump = rawmidi_to_ump(substream->rmidi);
if (ump->ops->drain)
ump->ops->drain(ump, SNDRV_RAWMIDI_STREAM_OUTPUT);
}
/* number of 32bit words per message type */
static unsigned char ump_packet_words[0x10] = {
1, 1, 1, 2, 2, 4, 1, 1, 2, 2, 2, 3, 3, 4, 4, 4
};
/**
* snd_ump_receive_ump_val - parse the UMP packet data
* @ump: UMP endpoint
* @val: UMP packet data
*
* The data is copied onto ump->input_buf[].
* When a full packet is completed, returns the number of words (from 1 to 4).
* OTOH, if the packet is incomplete, returns 0.
*/
int snd_ump_receive_ump_val(struct snd_ump_endpoint *ump, u32 val)
{
int words;
if (!ump->input_pending)
ump->input_pending = ump_packet_words[ump_message_type(val)];
ump->input_buf[ump->input_buf_head++] = val;
ump->input_pending--;
if (!ump->input_pending) {
words = ump->input_buf_head;
ump->input_buf_head = 0;
return words;
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_ump_receive_ump_val);
/**
* snd_ump_receive - transfer UMP packets from the device
* @ump: the UMP endpoint
* @buffer: the buffer pointer to transfer
* @count: byte size to transfer
*
* Called from the driver to submit the received UMP packets from the device
* to user-space. It's essentially a wrapper of rawmidi_receive().
* The data to receive is in CPU-native endianness.
*/
int snd_ump_receive(struct snd_ump_endpoint *ump, const u32 *buffer, int count)
{
struct snd_rawmidi_substream *substream;
const u32 *p = buffer;
int n, words = count >> 2;
while (words--) {
n = snd_ump_receive_ump_val(ump, *p++);
if (!n)
continue;
ump_handle_stream_msg(ump, ump->input_buf, n);
#if IS_ENABLED(CONFIG_SND_SEQUENCER)
if (ump->seq_ops)
ump->seq_ops->input_receive(ump, ump->input_buf, n);
#endif
process_legacy_input(ump, ump->input_buf, n);
}
substream = ump->substreams[SNDRV_RAWMIDI_STREAM_INPUT];
if (!substream)
return 0;
return snd_rawmidi_receive(substream, (const char *)buffer, count);
}
EXPORT_SYMBOL_GPL(snd_ump_receive);
/**
* snd_ump_transmit - transmit UMP packets
* @ump: the UMP endpoint
* @buffer: the buffer pointer to transfer
* @count: byte size to transfer
*
* Called from the driver to obtain the UMP packets from user-space to the
* device. It's essentially a wrapper of rawmidi_transmit().
* The data to transmit is in CPU-native endianness.
*/
int snd_ump_transmit(struct snd_ump_endpoint *ump, u32 *buffer, int count)
{
struct snd_rawmidi_substream *substream =
ump->substreams[SNDRV_RAWMIDI_STREAM_OUTPUT];
int err;
if (!substream)
return -ENODEV;
err = snd_rawmidi_transmit(substream, (char *)buffer, count);
/* received either data or an error? */
if (err)
return err;
return process_legacy_output(ump, buffer, count);
}
EXPORT_SYMBOL_GPL(snd_ump_transmit);
/**
* snd_ump_block_new - Create a UMP block
* @ump: UMP object
* @blk: block ID number to create
* @direction: direction (in/out/bidirection)
* @first_group: the first group ID (0-based)
* @num_groups: the number of groups in this block
* @blk_ret: the pointer to store the resultant block object
*/
int snd_ump_block_new(struct snd_ump_endpoint *ump, unsigned int blk,
unsigned int direction, unsigned int first_group,
unsigned int num_groups, struct snd_ump_block **blk_ret)
{
struct snd_ump_block *fb, *p;
if (blk < 0 || blk >= SNDRV_UMP_MAX_BLOCKS)
return -EINVAL;
if (snd_ump_get_block(ump, blk))
return -EBUSY;
fb = kzalloc(sizeof(*fb), GFP_KERNEL);
if (!fb)
return -ENOMEM;
fb->ump = ump;
fb->info.card = ump->info.card;
fb->info.device = ump->info.device;
fb->info.block_id = blk;
if (blk >= ump->info.num_blocks)
ump->info.num_blocks = blk + 1;
fb->info.direction = direction;
fb->info.active = 1;
fb->info.first_group = first_group;
fb->info.num_groups = num_groups;
/* fill the default name, may be overwritten to a better name */
snprintf(fb->info.name, sizeof(fb->info.name), "Group %d-%d",
first_group + 1, first_group + num_groups);
/* put the entry in the ordered list */
list_for_each_entry(p, &ump->block_list, list) {
if (p->info.block_id > blk) {
list_add_tail(&fb->list, &p->list);
goto added;
}
}
list_add_tail(&fb->list, &ump->block_list);
added:
ump_dbg(ump, "Created a UMP Block #%d (%s)\n", blk, fb->info.name);
*blk_ret = fb;
return 0;
}
EXPORT_SYMBOL_GPL(snd_ump_block_new);
static int snd_ump_ioctl_block(struct snd_ump_endpoint *ump,
struct snd_ump_block_info __user *argp)
{
struct snd_ump_block *fb;
unsigned char id;
if (get_user(id, &argp->block_id))
return -EFAULT;
fb = snd_ump_get_block(ump, id);
if (!fb)
return -ENOENT;
if (copy_to_user(argp, &fb->info, sizeof(fb->info)))
return -EFAULT;
return 0;
}
/*
* Handle UMP-specific ioctls; called from snd_rawmidi_ioctl()
*/
static long snd_ump_ioctl(struct snd_rawmidi *rmidi, unsigned int cmd,
void __user *argp)
{
struct snd_ump_endpoint *ump = rawmidi_to_ump(rmidi);
switch (cmd) {
case SNDRV_UMP_IOCTL_ENDPOINT_INFO:
if (copy_to_user(argp, &ump->info, sizeof(ump->info)))
return -EFAULT;
return 0;
case SNDRV_UMP_IOCTL_BLOCK_INFO:
return snd_ump_ioctl_block(ump, argp);
default:
ump_dbg(ump, "rawmidi: unknown command = 0x%x\n", cmd);
return -ENOTTY;
}
}
static const char *ump_direction_string(int dir)
{
switch (dir) {
case SNDRV_UMP_DIR_INPUT:
return "input";
case SNDRV_UMP_DIR_OUTPUT:
return "output";
case SNDRV_UMP_DIR_BIDIRECTION:
return "bidirection";
default:
return "unknown";
}
}
static const char *ump_ui_hint_string(int dir)
{
switch (dir) {
case SNDRV_UMP_BLOCK_UI_HINT_RECEIVER:
return "receiver";
case SNDRV_UMP_BLOCK_UI_HINT_SENDER:
return "sender";
case SNDRV_UMP_BLOCK_UI_HINT_BOTH:
return "both";
default:
return "unknown";
}
}
/* Additional proc file output */
static void snd_ump_proc_read(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
struct snd_rawmidi *rmidi = entry->private_data;
struct snd_ump_endpoint *ump = rawmidi_to_ump(rmidi);
struct snd_ump_block *fb;
snd_iprintf(buffer, "EP Name: %s\n", ump->info.name);
snd_iprintf(buffer, "EP Product ID: %s\n", ump->info.product_id);
snd_iprintf(buffer, "UMP Version: 0x%04x\n", ump->info.version);
snd_iprintf(buffer, "Protocol Caps: 0x%08x\n", ump->info.protocol_caps);
snd_iprintf(buffer, "Protocol: 0x%08x\n", ump->info.protocol);
if (ump->info.version) {
snd_iprintf(buffer, "Manufacturer ID: 0x%08x\n",
ump->info.manufacturer_id);
snd_iprintf(buffer, "Family ID: 0x%04x\n", ump->info.family_id);
snd_iprintf(buffer, "Model ID: 0x%04x\n", ump->info.model_id);
snd_iprintf(buffer, "SW Revision: 0x%02x%02x%02x%02x\n",
ump->info.sw_revision[0],
ump->info.sw_revision[1],
ump->info.sw_revision[2],
ump->info.sw_revision[3]);
}
snd_iprintf(buffer, "Static Blocks: %s\n",
(ump->info.flags & SNDRV_UMP_EP_INFO_STATIC_BLOCKS) ? "Yes" : "No");
snd_iprintf(buffer, "Num Blocks: %d\n\n", ump->info.num_blocks);
list_for_each_entry(fb, &ump->block_list, list) {
snd_iprintf(buffer, "Block %d (%s)\n", fb->info.block_id,
fb->info.name);
snd_iprintf(buffer, " Direction: %s\n",
ump_direction_string(fb->info.direction));
snd_iprintf(buffer, " Active: %s\n",
fb->info.active ? "Yes" : "No");
snd_iprintf(buffer, " Groups: %d-%d\n",
fb->info.first_group + 1,
fb->info.first_group + fb->info.num_groups);
snd_iprintf(buffer, " Is MIDI1: %s%s\n",
(fb->info.flags & SNDRV_UMP_BLOCK_IS_MIDI1) ? "Yes" : "No",
(fb->info.flags & SNDRV_UMP_BLOCK_IS_LOWSPEED) ? " (Low Speed)" : "");
if (ump->info.version) {
snd_iprintf(buffer, " MIDI-CI Version: %d\n",
fb->info.midi_ci_version);
snd_iprintf(buffer, " Sysex8 Streams: %d\n",
fb->info.sysex8_streams);
snd_iprintf(buffer, " UI Hint: %s\n",
ump_ui_hint_string(fb->info.ui_hint));
}
snd_iprintf(buffer, "\n");
}
}
/*
* UMP endpoint and function block handling
*/
/* open / close UMP streams for the internal stream msg communication */
static int ump_request_open(struct snd_ump_endpoint *ump)
{
return snd_rawmidi_kernel_open(&ump->core, 0,
SNDRV_RAWMIDI_LFLG_OUTPUT,
&ump->stream_rfile);
}
static void ump_request_close(struct snd_ump_endpoint *ump)
{
snd_rawmidi_kernel_release(&ump->stream_rfile);
}
/* request a command and wait for the given response;
* @req1 and @req2 are u32 commands
* @reply is the expected UMP stream status
*/
static int ump_req_msg(struct snd_ump_endpoint *ump, u32 req1, u32 req2,
u32 reply)
{
u32 buf[4];
ump_dbg(ump, "%s: request %08x %08x, wait-for %08x\n",
__func__, req1, req2, reply);
memset(buf, 0, sizeof(buf));
buf[0] = req1;
buf[1] = req2;
ump->stream_finished = 0;
ump->stream_wait_for = reply;
snd_rawmidi_kernel_write(ump->stream_rfile.output,
(unsigned char *)&buf, 16);
wait_event_timeout(ump->stream_wait, ump->stream_finished,
msecs_to_jiffies(500));
if (!READ_ONCE(ump->stream_finished)) {
ump_dbg(ump, "%s: request timed out\n", __func__);
return -ETIMEDOUT;
}
ump->stream_finished = 0;
ump_dbg(ump, "%s: reply: %08x %08x %08x %08x\n",
__func__, buf[0], buf[1], buf[2], buf[3]);
return 0;
}
/* append the received letters via UMP packet to the given string buffer;
* return 1 if the full string is received or 0 to continue
*/
static int ump_append_string(struct snd_ump_endpoint *ump, char *dest,
int maxsize, const u32 *buf, int offset)
{
unsigned char format;
int c;
format = ump_stream_message_format(buf[0]);
if (format == UMP_STREAM_MSG_FORMAT_SINGLE ||
format == UMP_STREAM_MSG_FORMAT_START) {
c = 0;
} else {
c = strlen(dest);
if (c >= maxsize - 1)
return 1;
}
for (; offset < 16; offset++) {
dest[c] = buf[offset / 4] >> (3 - (offset % 4)) * 8;
if (!dest[c])
break;
if (++c >= maxsize - 1)
break;
}
dest[c] = 0;
return (format == UMP_STREAM_MSG_FORMAT_SINGLE ||
format == UMP_STREAM_MSG_FORMAT_END);
}
/* handle EP info stream message; update the UMP attributes */
static int ump_handle_ep_info_msg(struct snd_ump_endpoint *ump,
const union snd_ump_stream_msg *buf)
{
ump->info.version = (buf->ep_info.ump_version_major << 8) |
buf->ep_info.ump_version_minor;
ump->info.num_blocks = buf->ep_info.num_function_blocks;
if (ump->info.num_blocks > SNDRV_UMP_MAX_BLOCKS) {
ump_info(ump, "Invalid function blocks %d, fallback to 1\n",
ump->info.num_blocks);
ump->info.num_blocks = 1;
}
if (buf->ep_info.static_function_block)
ump->info.flags |= SNDRV_UMP_EP_INFO_STATIC_BLOCKS;
ump->info.protocol_caps = (buf->ep_info.protocol << 8) |
buf->ep_info.jrts;
ump_dbg(ump, "EP info: version=%x, num_blocks=%x, proto_caps=%x\n",
ump->info.version, ump->info.num_blocks, ump->info.protocol_caps);
return 1; /* finished */
}
/* handle EP device info stream message; update the UMP attributes */
static int ump_handle_device_info_msg(struct snd_ump_endpoint *ump,
const union snd_ump_stream_msg *buf)
{
ump->info.manufacturer_id = buf->device_info.manufacture_id & 0x7f7f7f;
ump->info.family_id = (buf->device_info.family_msb << 8) |
buf->device_info.family_lsb;
ump->info.model_id = (buf->device_info.model_msb << 8) |
buf->device_info.model_lsb;
ump->info.sw_revision[0] = (buf->device_info.sw_revision >> 24) & 0x7f;
ump->info.sw_revision[1] = (buf->device_info.sw_revision >> 16) & 0x7f;
ump->info.sw_revision[2] = (buf->device_info.sw_revision >> 8) & 0x7f;
ump->info.sw_revision[3] = buf->device_info.sw_revision & 0x7f;
ump_dbg(ump, "EP devinfo: manid=%08x, family=%04x, model=%04x, sw=%02x%02x%02x%02x\n",
ump->info.manufacturer_id,
ump->info.family_id,
ump->info.model_id,
ump->info.sw_revision[0],
ump->info.sw_revision[1],
ump->info.sw_revision[2],
ump->info.sw_revision[3]);
return 1; /* finished */
}
/* handle EP name stream message; update the UMP name string */
static int ump_handle_ep_name_msg(struct snd_ump_endpoint *ump,
const union snd_ump_stream_msg *buf)
{
return ump_append_string(ump, ump->info.name, sizeof(ump->info.name),
buf->raw, 2);
}
/* handle EP product id stream message; update the UMP product_id string */
static int ump_handle_product_id_msg(struct snd_ump_endpoint *ump,
const union snd_ump_stream_msg *buf)
{
return ump_append_string(ump, ump->info.product_id,
sizeof(ump->info.product_id),
buf->raw, 2);
}
/* notify the protocol change to sequencer */
static void seq_notify_protocol(struct snd_ump_endpoint *ump)
{
#if IS_ENABLED(CONFIG_SND_SEQUENCER)
if (ump->seq_ops && ump->seq_ops->switch_protocol)
ump->seq_ops->switch_protocol(ump);
#endif /* CONFIG_SND_SEQUENCER */
}
/**
* snd_ump_switch_protocol - switch MIDI protocol
* @ump: UMP endpoint
* @protocol: protocol to switch to
*
* Returns 1 if the protocol is actually switched, 0 if unchanged
*/
int snd_ump_switch_protocol(struct snd_ump_endpoint *ump, unsigned int protocol)
{
protocol &= ump->info.protocol_caps;
if (protocol == ump->info.protocol)
return 0;
ump->info.protocol = protocol;
ump_dbg(ump, "New protocol = %x (caps = %x)\n",
protocol, ump->info.protocol_caps);
seq_notify_protocol(ump);
return 1;
}
EXPORT_SYMBOL_GPL(snd_ump_switch_protocol);
/* handle EP stream config message; update the UMP protocol */
static int ump_handle_stream_cfg_msg(struct snd_ump_endpoint *ump,
const union snd_ump_stream_msg *buf)
{
unsigned int protocol =
(buf->stream_cfg.protocol << 8) | buf->stream_cfg.jrts;
snd_ump_switch_protocol(ump, protocol);
return 1; /* finished */
}
/* Extract Function Block info from UMP packet */
static void fill_fb_info(struct snd_ump_endpoint *ump,
struct snd_ump_block_info *info,
const union snd_ump_stream_msg *buf)
{
info->direction = buf->fb_info.direction;
info->ui_hint = buf->fb_info.ui_hint;
info->first_group = buf->fb_info.first_group;
info->num_groups = buf->fb_info.num_groups;
info->flags = buf->fb_info.midi_10;
info->active = buf->fb_info.active;
info->midi_ci_version = buf->fb_info.midi_ci_version;
info->sysex8_streams = buf->fb_info.sysex8_streams;
ump_dbg(ump, "FB %d: dir=%d, active=%d, first_gp=%d, num_gp=%d, midici=%d, sysex8=%d, flags=0x%x\n",
info->block_id, info->direction, info->active,
info->first_group, info->num_groups, info->midi_ci_version,
info->sysex8_streams, info->flags);
}
/* check whether the FB info gets updated by the current message */
static bool is_fb_info_updated(struct snd_ump_endpoint *ump,
struct snd_ump_block *fb,
const union snd_ump_stream_msg *buf)
{
char tmpbuf[offsetof(struct snd_ump_block_info, name)];
if (ump->info.flags & SNDRV_UMP_EP_INFO_STATIC_BLOCKS) {
ump_info(ump, "Skipping static FB info update (blk#%d)\n",
fb->info.block_id);
return 0;
}
memcpy(tmpbuf, &fb->info, sizeof(tmpbuf));
fill_fb_info(ump, (struct snd_ump_block_info *)tmpbuf, buf);
return memcmp(&fb->info, tmpbuf, sizeof(tmpbuf)) != 0;
}
/* notify the FB info/name change to sequencer */
static void seq_notify_fb_change(struct snd_ump_endpoint *ump,
struct snd_ump_block *fb)
{
#if IS_ENABLED(CONFIG_SND_SEQUENCER)
if (ump->seq_ops && ump->seq_ops->notify_fb_change)
ump->seq_ops->notify_fb_change(ump, fb);
#endif
}
/* handle FB info message; update FB info if the block is present */
static int ump_handle_fb_info_msg(struct snd_ump_endpoint *ump,
const union snd_ump_stream_msg *buf)
{
unsigned char blk;
struct snd_ump_block *fb;
blk = buf->fb_info.function_block_id;
fb = snd_ump_get_block(ump, blk);
/* complain only if updated after parsing */
if (!fb && ump->parsed) {
ump_info(ump, "Function Block Info Update for non-existing block %d\n",
blk);
return -ENODEV;
}
/* When updated after the initial parse, check the FB info update */
if (ump->parsed && !is_fb_info_updated(ump, fb, buf))
return 1; /* no content change */
if (fb) {
fill_fb_info(ump, &fb->info, buf);
if (ump->parsed)
seq_notify_fb_change(ump, fb);
}
return 1; /* finished */
}
/* handle FB name message; update the FB name string */
static int ump_handle_fb_name_msg(struct snd_ump_endpoint *ump,
const union snd_ump_stream_msg *buf)
{
unsigned char blk;
struct snd_ump_block *fb;
int ret;
blk = buf->fb_name.function_block_id;
fb = snd_ump_get_block(ump, blk);
if (!fb)
return -ENODEV;
ret = ump_append_string(ump, fb->info.name, sizeof(fb->info.name),
buf->raw, 3);
/* notify the FB name update to sequencer, too */
if (ret > 0 && ump->parsed)
seq_notify_fb_change(ump, fb);
return ret;
}
static int create_block_from_fb_info(struct snd_ump_endpoint *ump, int blk)
{
struct snd_ump_block *fb;
unsigned char direction, first_group, num_groups;
const union snd_ump_stream_msg *buf =
(const union snd_ump_stream_msg *)ump->input_buf;
u32 msg;
int err;
/* query the FB info once */
msg = ump_stream_compose(UMP_STREAM_MSG_STATUS_FB_DISCOVERY, 0) |
(blk << 8) | UMP_STREAM_MSG_REQUEST_FB_INFO;
err = ump_req_msg(ump, msg, 0, UMP_STREAM_MSG_STATUS_FB_INFO);
if (err < 0) {
ump_dbg(ump, "Unable to get FB info for block %d\n", blk);
return err;
}
/* the last input must be the FB info */
if (buf->fb_info.status != UMP_STREAM_MSG_STATUS_FB_INFO) {
ump_dbg(ump, "Inconsistent input: 0x%x\n", *buf->raw);
return -EINVAL;
}
direction = buf->fb_info.direction;
first_group = buf->fb_info.first_group;
num_groups = buf->fb_info.num_groups;
err = snd_ump_block_new(ump, blk, direction, first_group, num_groups,
&fb);
if (err < 0)
return err;
fill_fb_info(ump, &fb->info, buf);
msg = ump_stream_compose(UMP_STREAM_MSG_STATUS_FB_DISCOVERY, 0) |
(blk << 8) | UMP_STREAM_MSG_REQUEST_FB_NAME;
err = ump_req_msg(ump, msg, 0, UMP_STREAM_MSG_STATUS_FB_NAME);
if (err)
ump_dbg(ump, "Unable to get UMP FB name string #%d\n", blk);
return 0;
}
/* handle stream messages, called from snd_ump_receive() */
static void ump_handle_stream_msg(struct snd_ump_endpoint *ump,
const u32 *buf, int size)
{
const union snd_ump_stream_msg *msg;
unsigned int status;
int ret;
/* UMP stream message suppressed (for gadget UMP)? */
if (ump->no_process_stream)
return;
BUILD_BUG_ON(sizeof(*msg) != 16);
ump_dbg(ump, "Stream msg: %08x %08x %08x %08x\n",
buf[0], buf[1], buf[2], buf[3]);
if (size != 4 || ump_message_type(*buf) != UMP_MSG_TYPE_STREAM)
return;
msg = (const union snd_ump_stream_msg *)buf;
status = ump_stream_message_status(*buf);
switch (status) {
case UMP_STREAM_MSG_STATUS_EP_INFO:
ret = ump_handle_ep_info_msg(ump, msg);
break;
case UMP_STREAM_MSG_STATUS_DEVICE_INFO:
ret = ump_handle_device_info_msg(ump, msg);
break;
case UMP_STREAM_MSG_STATUS_EP_NAME:
ret = ump_handle_ep_name_msg(ump, msg);
break;
case UMP_STREAM_MSG_STATUS_PRODUCT_ID:
ret = ump_handle_product_id_msg(ump, msg);
break;
case UMP_STREAM_MSG_STATUS_STREAM_CFG:
ret = ump_handle_stream_cfg_msg(ump, msg);
break;
case UMP_STREAM_MSG_STATUS_FB_INFO:
ret = ump_handle_fb_info_msg(ump, msg);
break;
case UMP_STREAM_MSG_STATUS_FB_NAME:
ret = ump_handle_fb_name_msg(ump, msg);
break;
default:
return;
}
/* when the message has been processed fully, wake up */
if (ret > 0 && ump->stream_wait_for == status) {
WRITE_ONCE(ump->stream_finished, 1);
wake_up(&ump->stream_wait);
}
}
/**
* snd_ump_parse_endpoint - parse endpoint and create function blocks
* @ump: UMP object
*
* Returns 0 for successful parse, -ENODEV if device doesn't respond
* (or the query is unsupported), or other error code for serious errors.
*/
int snd_ump_parse_endpoint(struct snd_ump_endpoint *ump)
{
int blk, err;
u32 msg;
if (!(ump->core.info_flags & SNDRV_RAWMIDI_INFO_DUPLEX))
return -ENODEV;
err = ump_request_open(ump);
if (err < 0) {
ump_dbg(ump, "Unable to open rawmidi device: %d\n", err);
return err;
}
/* Check Endpoint Information */
msg = ump_stream_compose(UMP_STREAM_MSG_STATUS_EP_DISCOVERY, 0) |
0x0101; /* UMP version 1.1 */
err = ump_req_msg(ump, msg, UMP_STREAM_MSG_REQUEST_EP_INFO,
UMP_STREAM_MSG_STATUS_EP_INFO);
if (err < 0) {
ump_dbg(ump, "Unable to get UMP EP info\n");
goto error;
}
/* Request Endpoint Device Info */
err = ump_req_msg(ump, msg, UMP_STREAM_MSG_REQUEST_DEVICE_INFO,
UMP_STREAM_MSG_STATUS_DEVICE_INFO);
if (err < 0)
ump_dbg(ump, "Unable to get UMP EP device info\n");
/* Request Endpoint Name */
err = ump_req_msg(ump, msg, UMP_STREAM_MSG_REQUEST_EP_NAME,
UMP_STREAM_MSG_STATUS_EP_NAME);
if (err < 0)
ump_dbg(ump, "Unable to get UMP EP name string\n");
/* Request Endpoint Product ID */
err = ump_req_msg(ump, msg, UMP_STREAM_MSG_REQUEST_PRODUCT_ID,
UMP_STREAM_MSG_STATUS_PRODUCT_ID);
if (err < 0)
ump_dbg(ump, "Unable to get UMP EP product ID string\n");
/* Get the current stream configuration */
err = ump_req_msg(ump, msg, UMP_STREAM_MSG_REQUEST_STREAM_CFG,
UMP_STREAM_MSG_STATUS_STREAM_CFG);
if (err < 0)
ump_dbg(ump, "Unable to get UMP EP stream config\n");
/* Query and create blocks from Function Blocks */
for (blk = 0; blk < ump->info.num_blocks; blk++) {
err = create_block_from_fb_info(ump, blk);
if (err < 0)
continue;
}
error:
ump->parsed = true;
ump_request_close(ump);
if (err == -ETIMEDOUT)
err = -ENODEV;
return err;
}
EXPORT_SYMBOL_GPL(snd_ump_parse_endpoint);
#if IS_ENABLED(CONFIG_SND_UMP_LEGACY_RAWMIDI)
/*
* Legacy rawmidi support
*/
static int snd_ump_legacy_open(struct snd_rawmidi_substream *substream)
{
struct snd_ump_endpoint *ump = substream->rmidi->private_data;
int dir = substream->stream;
int group = ump->legacy_mapping[substream->number];
int err;
mutex_lock(&ump->open_mutex);
if (ump->legacy_substreams[dir][group]) {
err = -EBUSY;
goto unlock;
}
if (dir == SNDRV_RAWMIDI_STREAM_OUTPUT) {
if (!ump->legacy_out_opens) {
err = snd_rawmidi_kernel_open(&ump->core, 0,
SNDRV_RAWMIDI_LFLG_OUTPUT |
SNDRV_RAWMIDI_LFLG_APPEND,
&ump->legacy_out_rfile);