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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>
#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 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,
};
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);
}
/**
* 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);
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;
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
*/
static int snd_ump_dev_register(struct snd_rawmidi *rmidi)
{
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;
}
/**
* 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;
}
}
MODULE_DESCRIPTION("Universal MIDI Packet (UMP) Core Driver");
MODULE_LICENSE("GPL");
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