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rawmidi.c
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rawmidi.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Abstract layer for MIDI v1.0 stream
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*/
#include <sound/core.h>
#include <linux/major.h>
#include <linux/init.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/nospec.h>
#include <sound/rawmidi.h>
#include <sound/info.h>
#include <sound/control.h>
#include <sound/minors.h>
#include <sound/initval.h>
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
MODULE_LICENSE("GPL");
#ifdef CONFIG_SND_OSSEMUL
static int midi_map[SNDRV_CARDS];
static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
module_param_array(midi_map, int, NULL, 0444);
MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
module_param_array(amidi_map, int, NULL, 0444);
MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
#endif /* CONFIG_SND_OSSEMUL */
static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
static int snd_rawmidi_dev_free(struct snd_device *device);
static int snd_rawmidi_dev_register(struct snd_device *device);
static int snd_rawmidi_dev_disconnect(struct snd_device *device);
static LIST_HEAD(snd_rawmidi_devices);
static DEFINE_MUTEX(register_mutex);
#define rmidi_err(rmidi, fmt, args...) \
dev_err(&(rmidi)->dev, fmt, ##args)
#define rmidi_warn(rmidi, fmt, args...) \
dev_warn(&(rmidi)->dev, fmt, ##args)
#define rmidi_dbg(rmidi, fmt, args...) \
dev_dbg(&(rmidi)->dev, fmt, ##args)
static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
{
struct snd_rawmidi *rawmidi;
list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
if (rawmidi->card == card && rawmidi->device == device)
return rawmidi;
return NULL;
}
static inline unsigned short snd_rawmidi_file_flags(struct file *file)
{
switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
case FMODE_WRITE:
return SNDRV_RAWMIDI_LFLG_OUTPUT;
case FMODE_READ:
return SNDRV_RAWMIDI_LFLG_INPUT;
default:
return SNDRV_RAWMIDI_LFLG_OPEN;
}
}
static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
{
struct snd_rawmidi_runtime *runtime = substream->runtime;
return runtime->avail >= runtime->avail_min;
}
static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
size_t count)
{
struct snd_rawmidi_runtime *runtime = substream->runtime;
return runtime->avail >= runtime->avail_min &&
(!substream->append || runtime->avail >= count);
}
static void snd_rawmidi_input_event_work(struct work_struct *work)
{
struct snd_rawmidi_runtime *runtime =
container_of(work, struct snd_rawmidi_runtime, event_work);
if (runtime->event)
runtime->event(runtime->substream);
}
static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
{
struct snd_rawmidi_runtime *runtime;
runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
if (!runtime)
return -ENOMEM;
runtime->substream = substream;
spin_lock_init(&runtime->lock);
init_waitqueue_head(&runtime->sleep);
INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
runtime->event = NULL;
runtime->buffer_size = PAGE_SIZE;
runtime->avail_min = 1;
if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
runtime->avail = 0;
else
runtime->avail = runtime->buffer_size;
runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
if (!runtime->buffer) {
kfree(runtime);
return -ENOMEM;
}
runtime->appl_ptr = runtime->hw_ptr = 0;
substream->runtime = runtime;
return 0;
}
static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
{
struct snd_rawmidi_runtime *runtime = substream->runtime;
kvfree(runtime->buffer);
kfree(runtime);
substream->runtime = NULL;
return 0;
}
static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
if (!substream->opened)
return;
substream->ops->trigger(substream, up);
}
static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
if (!substream->opened)
return;
substream->ops->trigger(substream, up);
if (!up)
cancel_work_sync(&substream->runtime->event_work);
}
static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
bool is_input)
{
runtime->drain = 0;
runtime->appl_ptr = runtime->hw_ptr = 0;
runtime->avail = is_input ? 0 : runtime->buffer_size;
}
static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
bool is_input)
{
unsigned long flags;
spin_lock_irqsave(&runtime->lock, flags);
__reset_runtime_ptrs(runtime, is_input);
spin_unlock_irqrestore(&runtime->lock, flags);
}
int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
{
snd_rawmidi_output_trigger(substream, 0);
reset_runtime_ptrs(substream->runtime, false);
return 0;
}
EXPORT_SYMBOL(snd_rawmidi_drop_output);
int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
{
int err;
long timeout;
struct snd_rawmidi_runtime *runtime = substream->runtime;
err = 0;
runtime->drain = 1;
timeout = wait_event_interruptible_timeout(runtime->sleep,
(runtime->avail >= runtime->buffer_size),
10*HZ);
if (signal_pending(current))
err = -ERESTARTSYS;
if (runtime->avail < runtime->buffer_size && !timeout) {
rmidi_warn(substream->rmidi,
"rawmidi drain error (avail = %li, buffer_size = %li)\n",
(long)runtime->avail, (long)runtime->buffer_size);
err = -EIO;
}
runtime->drain = 0;
if (err != -ERESTARTSYS) {
/* we need wait a while to make sure that Tx FIFOs are empty */
if (substream->ops->drain)
substream->ops->drain(substream);
else
msleep(50);
snd_rawmidi_drop_output(substream);
}
return err;
}
EXPORT_SYMBOL(snd_rawmidi_drain_output);
int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
{
snd_rawmidi_input_trigger(substream, 0);
reset_runtime_ptrs(substream->runtime, true);
return 0;
}
EXPORT_SYMBOL(snd_rawmidi_drain_input);
/* look for an available substream for the given stream direction;
* if a specific subdevice is given, try to assign it
*/
static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
int stream, int mode,
struct snd_rawmidi_substream **sub_ret)
{
struct snd_rawmidi_substream *substream;
struct snd_rawmidi_str *s = &rmidi->streams[stream];
static unsigned int info_flags[2] = {
[SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
[SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
};
if (!(rmidi->info_flags & info_flags[stream]))
return -ENXIO;
if (subdevice >= 0 && subdevice >= s->substream_count)
return -ENODEV;
list_for_each_entry(substream, &s->substreams, list) {
if (substream->opened) {
if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
!(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
!substream->append)
continue;
}
if (subdevice < 0 || subdevice == substream->number) {
*sub_ret = substream;
return 0;
}
}
return -EAGAIN;
}
/* open and do ref-counting for the given substream */
static int open_substream(struct snd_rawmidi *rmidi,
struct snd_rawmidi_substream *substream,
int mode)
{
int err;
if (substream->use_count == 0) {
err = snd_rawmidi_runtime_create(substream);
if (err < 0)
return err;
err = substream->ops->open(substream);
if (err < 0) {
snd_rawmidi_runtime_free(substream);
return err;
}
substream->opened = 1;
substream->active_sensing = 0;
if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
substream->append = 1;
substream->pid = get_pid(task_pid(current));
rmidi->streams[substream->stream].substream_opened++;
}
substream->use_count++;
return 0;
}
static void close_substream(struct snd_rawmidi *rmidi,
struct snd_rawmidi_substream *substream,
int cleanup);
static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
struct snd_rawmidi_file *rfile)
{
struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
int err;
rfile->input = rfile->output = NULL;
if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
err = assign_substream(rmidi, subdevice,
SNDRV_RAWMIDI_STREAM_INPUT,
mode, &sinput);
if (err < 0)
return err;
}
if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
err = assign_substream(rmidi, subdevice,
SNDRV_RAWMIDI_STREAM_OUTPUT,
mode, &soutput);
if (err < 0)
return err;
}
if (sinput) {
err = open_substream(rmidi, sinput, mode);
if (err < 0)
return err;
}
if (soutput) {
err = open_substream(rmidi, soutput, mode);
if (err < 0) {
if (sinput)
close_substream(rmidi, sinput, 0);
return err;
}
}
rfile->rmidi = rmidi;
rfile->input = sinput;
rfile->output = soutput;
return 0;
}
/* called from sound/core/seq/seq_midi.c */
int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
int mode, struct snd_rawmidi_file *rfile)
{
struct snd_rawmidi *rmidi;
int err = 0;
if (snd_BUG_ON(!rfile))
return -EINVAL;
mutex_lock(®ister_mutex);
rmidi = snd_rawmidi_search(card, device);
if (!rmidi)
err = -ENODEV;
else if (!try_module_get(rmidi->card->module))
err = -ENXIO;
mutex_unlock(®ister_mutex);
if (err < 0)
return err;
mutex_lock(&rmidi->open_mutex);
err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
mutex_unlock(&rmidi->open_mutex);
if (err < 0)
module_put(rmidi->card->module);
return err;
}
EXPORT_SYMBOL(snd_rawmidi_kernel_open);
static int snd_rawmidi_open(struct inode *inode, struct file *file)
{
int maj = imajor(inode);
struct snd_card *card;
int subdevice;
unsigned short fflags;
int err;
struct snd_rawmidi *rmidi;
struct snd_rawmidi_file *rawmidi_file = NULL;
wait_queue_entry_t wait;
if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
return -EINVAL; /* invalid combination */
err = stream_open(inode, file);
if (err < 0)
return err;
if (maj == snd_major) {
rmidi = snd_lookup_minor_data(iminor(inode),
SNDRV_DEVICE_TYPE_RAWMIDI);
#ifdef CONFIG_SND_OSSEMUL
} else if (maj == SOUND_MAJOR) {
rmidi = snd_lookup_oss_minor_data(iminor(inode),
SNDRV_OSS_DEVICE_TYPE_MIDI);
#endif
} else
return -ENXIO;
if (rmidi == NULL)
return -ENODEV;
if (!try_module_get(rmidi->card->module)) {
snd_card_unref(rmidi->card);
return -ENXIO;
}
mutex_lock(&rmidi->open_mutex);
card = rmidi->card;
err = snd_card_file_add(card, file);
if (err < 0)
goto __error_card;
fflags = snd_rawmidi_file_flags(file);
if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
if (rawmidi_file == NULL) {
err = -ENOMEM;
goto __error;
}
init_waitqueue_entry(&wait, current);
add_wait_queue(&rmidi->open_wait, &wait);
while (1) {
subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
if (err >= 0)
break;
if (err == -EAGAIN) {
if (file->f_flags & O_NONBLOCK) {
err = -EBUSY;
break;
}
} else
break;
set_current_state(TASK_INTERRUPTIBLE);
mutex_unlock(&rmidi->open_mutex);
schedule();
mutex_lock(&rmidi->open_mutex);
if (rmidi->card->shutdown) {
err = -ENODEV;
break;
}
if (signal_pending(current)) {
err = -ERESTARTSYS;
break;
}
}
remove_wait_queue(&rmidi->open_wait, &wait);
if (err < 0) {
kfree(rawmidi_file);
goto __error;
}
#ifdef CONFIG_SND_OSSEMUL
if (rawmidi_file->input && rawmidi_file->input->runtime)
rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
if (rawmidi_file->output && rawmidi_file->output->runtime)
rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
#endif
file->private_data = rawmidi_file;
mutex_unlock(&rmidi->open_mutex);
snd_card_unref(rmidi->card);
return 0;
__error:
snd_card_file_remove(card, file);
__error_card:
mutex_unlock(&rmidi->open_mutex);
module_put(rmidi->card->module);
snd_card_unref(rmidi->card);
return err;
}
static void close_substream(struct snd_rawmidi *rmidi,
struct snd_rawmidi_substream *substream,
int cleanup)
{
if (--substream->use_count)
return;
if (cleanup) {
if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
snd_rawmidi_input_trigger(substream, 0);
else {
if (substream->active_sensing) {
unsigned char buf = 0xfe;
/* sending single active sensing message
* to shut the device up
*/
snd_rawmidi_kernel_write(substream, &buf, 1);
}
if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
snd_rawmidi_output_trigger(substream, 0);
}
}
substream->ops->close(substream);
if (substream->runtime->private_free)
substream->runtime->private_free(substream);
snd_rawmidi_runtime_free(substream);
substream->opened = 0;
substream->append = 0;
put_pid(substream->pid);
substream->pid = NULL;
rmidi->streams[substream->stream].substream_opened--;
}
static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
{
struct snd_rawmidi *rmidi;
rmidi = rfile->rmidi;
mutex_lock(&rmidi->open_mutex);
if (rfile->input) {
close_substream(rmidi, rfile->input, 1);
rfile->input = NULL;
}
if (rfile->output) {
close_substream(rmidi, rfile->output, 1);
rfile->output = NULL;
}
rfile->rmidi = NULL;
mutex_unlock(&rmidi->open_mutex);
wake_up(&rmidi->open_wait);
}
/* called from sound/core/seq/seq_midi.c */
int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
{
struct snd_rawmidi *rmidi;
if (snd_BUG_ON(!rfile))
return -ENXIO;
rmidi = rfile->rmidi;
rawmidi_release_priv(rfile);
module_put(rmidi->card->module);
return 0;
}
EXPORT_SYMBOL(snd_rawmidi_kernel_release);
static int snd_rawmidi_release(struct inode *inode, struct file *file)
{
struct snd_rawmidi_file *rfile;
struct snd_rawmidi *rmidi;
struct module *module;
rfile = file->private_data;
rmidi = rfile->rmidi;
rawmidi_release_priv(rfile);
kfree(rfile);
module = rmidi->card->module;
snd_card_file_remove(rmidi->card, file);
module_put(module);
return 0;
}
static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
struct snd_rawmidi_info *info)
{
struct snd_rawmidi *rmidi;
if (substream == NULL)
return -ENODEV;
rmidi = substream->rmidi;
memset(info, 0, sizeof(*info));
info->card = rmidi->card->number;
info->device = rmidi->device;
info->subdevice = substream->number;
info->stream = substream->stream;
info->flags = rmidi->info_flags;
strcpy(info->id, rmidi->id);
strcpy(info->name, rmidi->name);
strcpy(info->subname, substream->name);
info->subdevices_count = substream->pstr->substream_count;
info->subdevices_avail = (substream->pstr->substream_count -
substream->pstr->substream_opened);
return 0;
}
static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
struct snd_rawmidi_info __user *_info)
{
struct snd_rawmidi_info info;
int err;
err = snd_rawmidi_info(substream, &info);
if (err < 0)
return err;
if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
return -EFAULT;
return 0;
}
static int __snd_rawmidi_info_select(struct snd_card *card,
struct snd_rawmidi_info *info)
{
struct snd_rawmidi *rmidi;
struct snd_rawmidi_str *pstr;
struct snd_rawmidi_substream *substream;
rmidi = snd_rawmidi_search(card, info->device);
if (!rmidi)
return -ENXIO;
if (info->stream < 0 || info->stream > 1)
return -EINVAL;
info->stream = array_index_nospec(info->stream, 2);
pstr = &rmidi->streams[info->stream];
if (pstr->substream_count == 0)
return -ENOENT;
if (info->subdevice >= pstr->substream_count)
return -ENXIO;
list_for_each_entry(substream, &pstr->substreams, list) {
if ((unsigned int)substream->number == info->subdevice)
return snd_rawmidi_info(substream, info);
}
return -ENXIO;
}
int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
{
int ret;
mutex_lock(®ister_mutex);
ret = __snd_rawmidi_info_select(card, info);
mutex_unlock(®ister_mutex);
return ret;
}
EXPORT_SYMBOL(snd_rawmidi_info_select);
static int snd_rawmidi_info_select_user(struct snd_card *card,
struct snd_rawmidi_info __user *_info)
{
int err;
struct snd_rawmidi_info info;
if (get_user(info.device, &_info->device))
return -EFAULT;
if (get_user(info.stream, &_info->stream))
return -EFAULT;
if (get_user(info.subdevice, &_info->subdevice))
return -EFAULT;
err = snd_rawmidi_info_select(card, &info);
if (err < 0)
return err;
if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
return -EFAULT;
return 0;
}
static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
struct snd_rawmidi_params *params,
bool is_input)
{
char *newbuf, *oldbuf;
if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
return -EINVAL;
if (params->avail_min < 1 || params->avail_min > params->buffer_size)
return -EINVAL;
if (params->buffer_size != runtime->buffer_size) {
newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
if (!newbuf)
return -ENOMEM;
spin_lock_irq(&runtime->lock);
oldbuf = runtime->buffer;
runtime->buffer = newbuf;
runtime->buffer_size = params->buffer_size;
__reset_runtime_ptrs(runtime, is_input);
spin_unlock_irq(&runtime->lock);
kvfree(oldbuf);
}
runtime->avail_min = params->avail_min;
return 0;
}
int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
struct snd_rawmidi_params *params)
{
if (substream->append && substream->use_count > 1)
return -EBUSY;
snd_rawmidi_drain_output(substream);
substream->active_sensing = !params->no_active_sensing;
return resize_runtime_buffer(substream->runtime, params, false);
}
EXPORT_SYMBOL(snd_rawmidi_output_params);
int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
struct snd_rawmidi_params *params)
{
snd_rawmidi_drain_input(substream);
return resize_runtime_buffer(substream->runtime, params, true);
}
EXPORT_SYMBOL(snd_rawmidi_input_params);
static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
struct snd_rawmidi_status *status)
{
struct snd_rawmidi_runtime *runtime = substream->runtime;
memset(status, 0, sizeof(*status));
status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
spin_lock_irq(&runtime->lock);
status->avail = runtime->avail;
spin_unlock_irq(&runtime->lock);
return 0;
}
static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
struct snd_rawmidi_status *status)
{
struct snd_rawmidi_runtime *runtime = substream->runtime;
memset(status, 0, sizeof(*status));
status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
spin_lock_irq(&runtime->lock);
status->avail = runtime->avail;
status->xruns = runtime->xruns;
runtime->xruns = 0;
spin_unlock_irq(&runtime->lock);
return 0;
}
static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct snd_rawmidi_file *rfile;
void __user *argp = (void __user *)arg;
rfile = file->private_data;
if (((cmd >> 8) & 0xff) != 'W')
return -ENOTTY;
switch (cmd) {
case SNDRV_RAWMIDI_IOCTL_PVERSION:
return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
case SNDRV_RAWMIDI_IOCTL_INFO:
{
int stream;
struct snd_rawmidi_info __user *info = argp;
if (get_user(stream, &info->stream))
return -EFAULT;
switch (stream) {
case SNDRV_RAWMIDI_STREAM_INPUT:
return snd_rawmidi_info_user(rfile->input, info);
case SNDRV_RAWMIDI_STREAM_OUTPUT:
return snd_rawmidi_info_user(rfile->output, info);
default:
return -EINVAL;
}
}
case SNDRV_RAWMIDI_IOCTL_PARAMS:
{
struct snd_rawmidi_params params;
if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params)))
return -EFAULT;
switch (params.stream) {
case SNDRV_RAWMIDI_STREAM_OUTPUT:
if (rfile->output == NULL)
return -EINVAL;
return snd_rawmidi_output_params(rfile->output, ¶ms);
case SNDRV_RAWMIDI_STREAM_INPUT:
if (rfile->input == NULL)
return -EINVAL;
return snd_rawmidi_input_params(rfile->input, ¶ms);
default:
return -EINVAL;
}
}
case SNDRV_RAWMIDI_IOCTL_STATUS:
{
int err = 0;
struct snd_rawmidi_status status;
if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
return -EFAULT;
switch (status.stream) {
case SNDRV_RAWMIDI_STREAM_OUTPUT:
if (rfile->output == NULL)
return -EINVAL;
err = snd_rawmidi_output_status(rfile->output, &status);
break;
case SNDRV_RAWMIDI_STREAM_INPUT:
if (rfile->input == NULL)
return -EINVAL;
err = snd_rawmidi_input_status(rfile->input, &status);
break;
default:
return -EINVAL;
}
if (err < 0)
return err;
if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
return -EFAULT;
return 0;
}
case SNDRV_RAWMIDI_IOCTL_DROP:
{
int val;
if (get_user(val, (int __user *) argp))
return -EFAULT;
switch (val) {
case SNDRV_RAWMIDI_STREAM_OUTPUT:
if (rfile->output == NULL)
return -EINVAL;
return snd_rawmidi_drop_output(rfile->output);
default:
return -EINVAL;
}
}
case SNDRV_RAWMIDI_IOCTL_DRAIN:
{
int val;
if (get_user(val, (int __user *) argp))
return -EFAULT;
switch (val) {
case SNDRV_RAWMIDI_STREAM_OUTPUT:
if (rfile->output == NULL)
return -EINVAL;
return snd_rawmidi_drain_output(rfile->output);
case SNDRV_RAWMIDI_STREAM_INPUT:
if (rfile->input == NULL)
return -EINVAL;
return snd_rawmidi_drain_input(rfile->input);
default:
return -EINVAL;
}
}
default:
rmidi_dbg(rfile->rmidi,
"rawmidi: unknown command = 0x%x\n", cmd);
}
return -ENOTTY;
}
static int snd_rawmidi_control_ioctl(struct snd_card *card,
struct snd_ctl_file *control,
unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
switch (cmd) {
case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
{
int device;
if (get_user(device, (int __user *)argp))
return -EFAULT;
if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
device = SNDRV_RAWMIDI_DEVICES - 1;
mutex_lock(®ister_mutex);
device = device < 0 ? 0 : device + 1;
while (device < SNDRV_RAWMIDI_DEVICES) {
if (snd_rawmidi_search(card, device))
break;
device++;
}
if (device == SNDRV_RAWMIDI_DEVICES)
device = -1;
mutex_unlock(®ister_mutex);
if (put_user(device, (int __user *)argp))
return -EFAULT;
return 0;
}
case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
{
int val;
if (get_user(val, (int __user *)argp))
return -EFAULT;
control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
return 0;
}
case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
return snd_rawmidi_info_select_user(card, argp);
}
return -ENOIOCTLCMD;
}
/**
* snd_rawmidi_receive - receive the input data from the device
* @substream: the rawmidi substream
* @buffer: the buffer pointer
* @count: the data size to read
*
* Reads the data from the internal buffer.
*
* Return: The size of read data, or a negative error code on failure.
*/
int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
const unsigned char *buffer, int count)
{
unsigned long flags;
int result = 0, count1;
struct snd_rawmidi_runtime *runtime = substream->runtime;
if (!substream->opened)
return -EBADFD;
if (runtime->buffer == NULL) {
rmidi_dbg(substream->rmidi,
"snd_rawmidi_receive: input is not active!!!\n");
return -EINVAL;
}
spin_lock_irqsave(&runtime->lock, flags);
if (count == 1) { /* special case, faster code */
substream->bytes++;
if (runtime->avail < runtime->buffer_size) {
runtime->buffer[runtime->hw_ptr++] = buffer[0];
runtime->hw_ptr %= runtime->buffer_size;
runtime->avail++;
result++;
} else {
runtime->xruns++;
}
} else {
substream->bytes += count;
count1 = runtime->buffer_size - runtime->hw_ptr;
if (count1 > count)
count1 = count;
if (count1 > (int)(runtime->buffer_size - runtime->avail))
count1 = runtime->buffer_size - runtime->avail;
memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
runtime->hw_ptr += count1;
runtime->hw_ptr %= runtime->buffer_size;
runtime->avail += count1;
count -= count1;
result += count1;
if (count > 0) {
buffer += count1;
count1 = count;
if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
count1 = runtime->buffer_size - runtime->avail;
runtime->xruns += count - count1;
}
if (count1 > 0) {
memcpy(runtime->buffer, buffer, count1);
runtime->hw_ptr = count1;
runtime->avail += count1;
result += count1;
}
}
}
if (result > 0) {
if (runtime->event)
schedule_work(&runtime->event_work);
else if (snd_rawmidi_ready(substream))
wake_up(&runtime->sleep);
}
spin_unlock_irqrestore(&runtime->lock, flags);
return result;
}
EXPORT_SYMBOL(snd_rawmidi_receive);
static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
unsigned char __user *userbuf,
unsigned char *kernelbuf, long count)
{
unsigned long flags;
long result = 0, count1;
struct snd_rawmidi_runtime *runtime = substream->runtime;
unsigned long appl_ptr;
spin_lock_irqsave(&runtime->lock, flags);
while (count > 0 && runtime->avail) {
count1 = runtime->buffer_size - runtime->appl_ptr;
if (count1 > count)
count1 = count;
if (count1 > (int)runtime->avail)
count1 = runtime->avail;
/* update runtime->appl_ptr before unlocking for userbuf */
appl_ptr = runtime->appl_ptr;
runtime->appl_ptr += count1;
runtime->appl_ptr %= runtime->buffer_size;
runtime->avail -= count1;
if (kernelbuf)
memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
if (userbuf) {
spin_unlock_irqrestore(&runtime->lock, flags);
if (copy_to_user(userbuf + result,
runtime->buffer + appl_ptr, count1)) {
return result > 0 ? result : -EFAULT;
}
spin_lock_irqsave(&runtime->lock, flags);
}
result += count1;
count -= count1;
}
spin_unlock_irqrestore(&runtime->lock, flags);
return result;
}
long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
unsigned char *buf, long count)
{
snd_rawmidi_input_trigger(substream, 1);
return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
}
EXPORT_SYMBOL(snd_rawmidi_kernel_read);
static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
loff_t *offset)
{
long result;
int count1;
struct snd_rawmidi_file *rfile;
struct snd_rawmidi_substream *substream;
struct snd_rawmidi_runtime *runtime;
rfile = file->private_data;
substream = rfile->input;
if (substream == NULL)
return -EIO;