| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Jaroslav Kysela | 5881 | 55.07% | 39 | 18.31% |
| Takashi Iwai | 2929 | 27.43% | 49 | 23.00% |
| Linus Torvalds (pre-git) | 650 | 6.09% | 74 | 34.74% |
| David Henningsson | 473 | 4.43% | 1 | 0.47% |
| Clemens Ladisch | 234 | 2.19% | 11 | 5.16% |
| Baolin Wang | 223 | 2.09% | 1 | 0.47% |
| Linus Torvalds | 107 | 1.00% | 12 | 5.63% |
| Marcin Ślusarz | 39 | 0.37% | 1 | 0.47% |
| Al Viro | 38 | 0.36% | 4 | 1.88% |
| Akinobu Mita | 26 | 0.24% | 1 | 0.47% |
| Johannes Berg | 19 | 0.18% | 1 | 0.47% |
| Gustavo A. R. Silva | 16 | 0.15% | 1 | 0.47% |
| Ingo Molnar | 14 | 0.13% | 3 | 1.41% |
| Dan Carpenter | 9 | 0.08% | 1 | 0.47% |
| Jesper Juhl | 5 | 0.05% | 1 | 0.47% |
| Christoph Hellwig | 3 | 0.03% | 3 | 1.41% |
| Rusty Russell | 2 | 0.02% | 1 | 0.47% |
| Yacine Belkadi | 2 | 0.02% | 1 | 0.47% |
| Thomas Gleixner | 2 | 0.02% | 1 | 0.47% |
| Karsten Wiese | 2 | 0.02% | 1 | 0.47% |
| Colin Ian King | 1 | 0.01% | 1 | 0.47% |
| Joe Perches | 1 | 0.01% | 1 | 0.47% |
| Paul Gortmaker | 1 | 0.01% | 1 | 0.47% |
| Arjan van de Ven | 1 | 0.01% | 1 | 0.47% |
| Kirill Smelkov | 1 | 0.01% | 1 | 0.47% |
| Adrian Bunk | 1 | 0.01% | 1 | 0.47% |
| Total | 10680 | 213 |
// 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> #include <sound/ump.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_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) struct snd_rawmidi_status32 { s32 stream; s32 tstamp_sec; /* Timestamp */ s32 tstamp_nsec; u32 avail; /* available bytes */ u32 xruns; /* count of overruns since last status (in bytes) */ unsigned char reserved[16]; /* reserved for future use */ }; #define SNDRV_RAWMIDI_IOCTL_STATUS32 _IOWR('W', 0x20, struct snd_rawmidi_status32) struct snd_rawmidi_status64 { int stream; u8 rsvd[4]; /* alignment */ s64 tstamp_sec; /* Timestamp */ s64 tstamp_nsec; size_t avail; /* available bytes */ size_t xruns; /* count of overruns since last status (in bytes) */ unsigned char reserved[16]; /* reserved for future use */ }; #define SNDRV_RAWMIDI_IOCTL_STATUS64 _IOWR('W', 0x20, struct snd_rawmidi_status64) #define rawmidi_is_ump(rmidi) \ (IS_ENABLED(CONFIG_SND_UMP) && ((rmidi)->info_flags & SNDRV_RAWMIDI_INFO_UMP)) 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 bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime) { return runtime->avail >= runtime->avail_min; } static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream) { guard(spinlock_irqsave)(&substream->lock); return __snd_rawmidi_ready(substream->runtime); } 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); } /* buffer refcount management: call with substream->lock held */ static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime) { runtime->buffer_ref++; } static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime) { runtime->buffer_ref--; } static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream) { int loop = HZ; spin_lock_irq(&substream->lock); while (substream->runtime->buffer_ref) { spin_unlock_irq(&substream->lock); if (!--loop) { rmidi_err(substream->rmidi, "Buffer ref sync timeout\n"); return; } schedule_timeout_uninterruptible(1); spin_lock_irq(&substream->lock); } spin_unlock_irq(&substream->lock); } 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; 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; if (rawmidi_is_ump(substream->rmidi)) runtime->align = 3; return 0; } /* get the current alignment (either 0 or 3) */ static inline int get_align(struct snd_rawmidi_runtime *runtime) { if (IS_ENABLED(CONFIG_SND_UMP)) return runtime->align; else return 0; } /* get the trimmed size with the current alignment */ #define get_aligned_size(runtime, size) ((size) & ~get_align(runtime)) 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_substream *substream, bool is_input) { guard(spinlock_irqsave)(&substream->lock); if (substream->opened && substream->runtime) __reset_runtime_ptrs(substream->runtime, is_input); } int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream) { snd_rawmidi_output_trigger(substream, 0); reset_runtime_ptrs(substream, false); return 0; } EXPORT_SYMBOL(snd_rawmidi_drop_output); int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream) { int err = 0; long timeout; struct snd_rawmidi_runtime *runtime; scoped_guard(spinlock_irq, &substream->lock) { runtime = substream->runtime; if (!substream->opened || !runtime || !runtime->buffer) return -EINVAL; snd_rawmidi_buffer_ref(runtime); runtime->drain = 1; } timeout = wait_event_interruptible_timeout(runtime->sleep, (runtime->avail >= runtime->buffer_size), 10*HZ); scoped_guard(spinlock_irq, &substream->lock) { 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); } scoped_guard(spinlock_irq, &substream->lock) snd_rawmidi_buffer_unref(runtime); 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, 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 const 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; } guard(spinlock_irq)(&substream->lock); 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_rawmidi *rmidi, int subdevice, int mode, struct snd_rawmidi_file *rfile) { int err; if (snd_BUG_ON(!rfile)) return -EINVAL; if (!try_module_get(rmidi->card->module)) return -ENXIO; guard(mutex)(&rmidi->open_mutex); err = rawmidi_open_priv(rmidi, subdevice, mode, rfile); 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; } rawmidi_file->user_pversion = 0; 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); } snd_rawmidi_buffer_ref_sync(substream); } scoped_guard(spinlock_irq, &substream->lock) { substream->opened = 0; substream->append = 0; } substream->ops->close(substream); if (substream->runtime->private_free) substream->runtime->private_free(substream); snd_rawmidi_runtime_free(substream); 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; guard(mutex)(&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; 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) { guard(mutex)(®ister_mutex); return __snd_rawmidi_info_select(card, info); } 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_substream *substream, struct snd_rawmidi_params *params, bool is_input) { struct snd_rawmidi_runtime *runtime = substream->runtime; char *newbuf, *oldbuf; unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK; if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) return -EINVAL; if (framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP && (params->buffer_size & 0x1f) != 0) return -EINVAL; if (params->avail_min < 1 || params->avail_min > params->buffer_size) return -EINVAL; if (params->buffer_size & get_align(runtime)) return -EINVAL; if (params->buffer_size != runtime->buffer_size) { newbuf = kvzalloc(params->buffer_size, GFP_KERNEL); if (!newbuf) return -ENOMEM; guard(spinlock_irq)(&substream->lock); if (runtime->buffer_ref) { kvfree(newbuf); return -EBUSY; } oldbuf = runtime->buffer; runtime->buffer = newbuf; runtime->buffer_size = params->buffer_size; __reset_runtime_ptrs(runtime, is_input); 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) { int err; snd_rawmidi_drain_output(substream); guard(mutex)(&substream->rmidi->open_mutex); if (substream->append && substream->use_count > 1) return -EBUSY; err = resize_runtime_buffer(substream, params, false); if (!err) substream->active_sensing = !params->no_active_sensing; return err; } EXPORT_SYMBOL(snd_rawmidi_output_params); int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, struct snd_rawmidi_params *params) { unsigned int framing = params->mode & SNDRV_RAWMIDI_MODE_FRAMING_MASK; unsigned int clock_type = params->mode & SNDRV_RAWMIDI_MODE_CLOCK_MASK; int err; snd_rawmidi_drain_input(substream); guard(mutex)(&substream->rmidi->open_mutex); if (framing == SNDRV_RAWMIDI_MODE_FRAMING_NONE && clock_type != SNDRV_RAWMIDI_MODE_CLOCK_NONE) err = -EINVAL; else if (clock_type > SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW) err = -EINVAL; else if (framing > SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) err = -EINVAL; else err = resize_runtime_buffer(substream, params, true); if (!err) { substream->framing = framing; substream->clock_type = clock_type; } return 0; } EXPORT_SYMBOL(snd_rawmidi_input_params); static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream, struct snd_rawmidi_status64 *status) { struct snd_rawmidi_runtime *runtime = substream->runtime; memset(status, 0, sizeof(*status)); status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT; guard(spinlock_irq)(&substream->lock); status->avail = runtime->avail; return 0; } static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream, struct snd_rawmidi_status64 *status) { struct snd_rawmidi_runtime *runtime = substream->runtime; memset(status, 0, sizeof(*status)); status->stream = SNDRV_RAWMIDI_STREAM_INPUT; guard(spinlock_irq)(&substream->lock); status->avail = runtime->avail; status->xruns = runtime->xruns; runtime->xruns = 0; return 0; } static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile, struct snd_rawmidi_status32 __user *argp) { int err = 0; struct snd_rawmidi_status32 __user *status = argp; struct snd_rawmidi_status32 status32; struct snd_rawmidi_status64 status64; if (copy_from_user(&status32, argp, sizeof(struct snd_rawmidi_status32))) return -EFAULT; switch (status32.stream) { case SNDRV_RAWMIDI_STREAM_OUTPUT: if (rfile->output == NULL) return -EINVAL; err = snd_rawmidi_output_status(rfile->output, &status64); break; case SNDRV_RAWMIDI_STREAM_INPUT: if (rfile->input == NULL) return -EINVAL; err = snd_rawmidi_input_status(rfile->input, &status64); break; default: return -EINVAL; } if (err < 0) return err; status32 = (struct snd_rawmidi_status32) { .stream = status64.stream, .tstamp_sec = status64.tstamp_sec, .tstamp_nsec = status64.tstamp_nsec, .avail = status64.avail, .xruns = status64.xruns, }; if (copy_to_user(status, &status32, sizeof(*status))) return -EFAULT; return 0; } static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile, struct snd_rawmidi_status64 __user *argp) { int err = 0; struct snd_rawmidi_status64 status; if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64))) 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_status64))) return -EFAULT; return 0; } static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct snd_rawmidi_file *rfile; struct snd_rawmidi *rmidi; 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_USER_PVERSION: if (get_user(rfile->user_pversion, (unsigned int __user *)arg)) return -EFAULT; return 0; case SNDRV_RAWMIDI_IOCTL_PARAMS: { struct snd_rawmidi_params params; if (copy_from_user(¶ms, argp, sizeof(struct snd_rawmidi_params))) return -EFAULT; if (rfile->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 2)) { params.mode = 0; memset(params.reserved, 0, sizeof(params.reserved)); } 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_STATUS32: return snd_rawmidi_ioctl_status32(rfile, argp); case SNDRV_RAWMIDI_IOCTL_STATUS64: return snd_rawmidi_ioctl_status64(rfile, argp); 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 = rfile->rmidi; if (rmidi->ops && rmidi->ops->ioctl) return rmidi->ops->ioctl(rmidi, cmd, argp); rmidi_dbg(rmidi, "rawmidi: unknown command = 0x%x\n", cmd); } return -ENOTTY; } /* ioctl to find the next device; either legacy or UMP depending on @find_ump */ static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp, bool find_ump) { struct snd_rawmidi *rmidi; int device; bool is_ump; if (get_user(device, argp)) return -EFAULT; if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */ device = SNDRV_RAWMIDI_DEVICES - 1; scoped_guard(mutex, ®ister_mutex) { device = device < 0 ? 0 : device + 1; for (; device < SNDRV_RAWMIDI_DEVICES; device++) { rmidi = snd_rawmidi_search(card, device); if (!rmidi) continue; is_ump = rawmidi_is_ump(rmidi); if (find_ump == is_ump) break; } if (device == SNDRV_RAWMIDI_DEVICES) device = -1; } if (put_user(device, argp)) return -EFAULT; return 0; } #if IS_ENABLED(CONFIG_SND_UMP) /* inquiry of UMP endpoint and block info via control API */ static int snd_rawmidi_call_ump_ioctl(struct snd_card *card, int cmd, void __user *argp) { struct snd_ump_endpoint_info __user *info = argp; struct snd_rawmidi *rmidi; int device; if (get_user(device, &info->device)) return -EFAULT; guard(mutex)(®ister_mutex); rmidi = snd_rawmidi_search(card, device); if (rmidi && rmidi->ops && rmidi->ops->ioctl) return rmidi->ops->ioctl(rmidi, cmd, argp); else return -ENXIO; } #endif 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: return snd_rawmidi_next_device(card, argp, false); #if IS_ENABLED(CONFIG_SND_UMP) case SNDRV_CTL_IOCTL_UMP_NEXT_DEVICE: return snd_rawmidi_next_device(card, argp, true); case SNDRV_CTL_IOCTL_UMP_ENDPOINT_INFO: return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_ENDPOINT_INFO, argp); case SNDRV_CTL_IOCTL_UMP_BLOCK_INFO: return snd_rawmidi_call_ump_ioctl(card, SNDRV_UMP_IOCTL_BLOCK_INFO, argp); #endif 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; } static int receive_with_tstamp_framing(struct snd_rawmidi_substream *substream, const unsigned char *buffer, int src_count, const struct timespec64 *tstamp) { struct snd_rawmidi_runtime *runtime = substream->runtime; struct snd_rawmidi_framing_tstamp *dest_ptr; struct snd_rawmidi_framing_tstamp frame = { .tv_sec = tstamp->tv_sec, .tv_nsec = tstamp->tv_nsec }; int orig_count = src_count; int frame_size = sizeof(struct snd_rawmidi_framing_tstamp); int align = get_align(runtime); BUILD_BUG_ON(frame_size != 0x20); if (snd_BUG_ON((runtime->hw_ptr & 0x1f) != 0)) return -EINVAL; while (src_count > align) { if ((int)(runtime->buffer_size - runtime->avail) < frame_size) { runtime->xruns += src_count; break; } if (src_count >= SNDRV_RAWMIDI_FRAMING_DATA_LENGTH) frame.length = SNDRV_RAWMIDI_FRAMING_DATA_LENGTH; else { frame.length = get_aligned_size(runtime, src_count); if (!frame.length) break; memset(frame.data, 0, SNDRV_RAWMIDI_FRAMING_DATA_LENGTH); } memcpy(frame.data, buffer, frame.length); buffer += frame.length; src_count -= frame.length; dest_ptr = (struct snd_rawmidi_framing_tstamp *) (runtime->buffer + runtime->hw_ptr); *dest_ptr = frame; runtime->avail += frame_size; runtime->hw_ptr += frame_size; runtime->hw_ptr %= runtime->buffer_size; } return orig_count - src_count; } static struct timespec64 get_framing_tstamp(struct snd_rawmidi_substream *substream) { struct timespec64 ts64 = {0, 0}; switch (substream->clock_type) { case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC_RAW: ktime_get_raw_ts64(&ts64); break; case SNDRV_RAWMIDI_MODE_CLOCK_MONOTONIC: ktime_get_ts64(&ts64); break; case SNDRV_RAWMIDI_MODE_CLOCK_REALTIME: ktime_get_real_ts64(&ts64); break; } return ts64; } /** * 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) { struct timespec64 ts64 = get_framing_tstamp(substream); int result = 0, count1; struct snd_rawmidi_runtime *runtime; guard(spinlock_irqsave)(&substream->lock); if (!substream->opened) return -EBADFD; runtime = substream->runtime; if (!runtime || !runtime->buffer) { rmidi_dbg(substream->rmidi, "snd_rawmidi_receive: input is not active!!!\n"); return -EINVAL; } count = get_aligned_size(runtime, count); if (!count) return result; if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) { result = receive_with_tstamp_framing(substream, buffer, count, &ts64); } else 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; count1 = get_aligned_size(runtime, count1); if (!count1) return result; 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(runtime)) wake_up(&runtime->sleep); } 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; int err = 0; spin_lock_irqsave(&substream->lock, flags); snd_rawmidi_buffer_ref(runtime); 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(&substream->lock, flags); if (copy_to_user(userbuf + result, runtime->buffer + appl_ptr, count1)) err = -EFAULT; spin_lock_irqsave(&substream->lock, flags); if (err) goto out; } result += count1; count -= count1; } out: snd_rawmidi_buffer_unref(runtime); spin_unlock_irqrestore(&substream->lock, flags); return result > 0 ? result : err; } 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; runtime = substream->runtime; snd_rawmidi_input_trigger(substream, 1); result = 0; while (count > 0) { spin_lock_irq(&substream->lock); while (!__snd_rawmidi_ready(runtime)) { wait_queue_entry_t wait; if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { spin_unlock_irq(&substream->lock); return result > 0 ? result : -EAGAIN; } init_waitqueue_entry(&wait, current); add_wait_queue(&runtime->sleep, &wait); set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irq(&substream->lock); schedule(); remove_wait_queue(&runtime->sleep, &wait); if (rfile->rmidi->card->shutdown) return -ENODEV; if (signal_pending(current)) return result > 0 ? result : -ERESTARTSYS; spin_lock_irq(&substream->lock); if (!runtime->avail) { spin_unlock_irq(&substream->lock); return result > 0 ? result : -EIO; } } spin_unlock_irq(&substream->lock); count1 = snd_rawmidi_kernel_read1(substream, (unsigned char __user *)buf, NULL/*kernelbuf*/, count); if (count1 < 0) return result > 0 ? result : count1; result += count1; buf += count1; count -= count1; } return result; } /** * snd_rawmidi_transmit_empty - check whether the output buffer is empty * @substream: the rawmidi substream * * Return: 1 if the internal output buffer is empty, 0 if not. */ int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream) { struct snd_rawmidi_runtime *runtime; guard(spinlock_irqsave)(&substream->lock); runtime = substream->runtime; if (!substream->opened || !runtime || !runtime->buffer) { rmidi_dbg(substream->rmidi, "snd_rawmidi_transmit_empty: output is not active!!!\n"); return 1; } return (runtime->avail >= runtime->buffer_size); } EXPORT_SYMBOL(snd_rawmidi_transmit_empty); /* * __snd_rawmidi_transmit_peek - copy data from the internal buffer * @substream: the rawmidi substream * @buffer: the buffer pointer * @count: data size to transfer * * This is a variant of snd_rawmidi_transmit_peek() without spinlock. */ static int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, unsigned char *buffer, int count) { int result, count1; struct snd_rawmidi_runtime *runtime = substream->runtime; if (runtime->buffer == NULL) { rmidi_dbg(substream->rmidi, "snd_rawmidi_transmit_peek: output is not active!!!\n"); return -EINVAL; } result = 0; if (runtime->avail >= runtime->buffer_size) { /* warning: lowlevel layer MUST trigger down the hardware */ goto __skip; } if (count == 1) { /* special case, faster code */ *buffer = runtime->buffer[runtime->hw_ptr]; result++; } else { 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; count1 = get_aligned_size(runtime, count1); if (!count1) goto __skip; memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1); count -= count1; result += count1; if (count > 0) { if (count > (int)(runtime->buffer_size - runtime->avail - count1)) count = runtime->buffer_size - runtime->avail - count1; count = get_aligned_size(runtime, count); if (!count) goto __skip; memcpy(buffer + count1, runtime->buffer, count); result += count; } } __skip: return result; } /** * snd_rawmidi_transmit_peek - copy data from the internal buffer * @substream: the rawmidi substream * @buffer: the buffer pointer * @count: data size to transfer * * Copies data from the internal output buffer to the given buffer. * * Call this in the interrupt handler when the midi output is ready, * and call snd_rawmidi_transmit_ack() after the transmission is * finished. * * Return: The size of copied data, or a negative error code on failure. */ int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, unsigned char *buffer, int count) { guard(spinlock_irqsave)(&substream->lock); if (!substream->opened || !substream->runtime) return -EBADFD; return __snd_rawmidi_transmit_peek(substream, buffer, count); } EXPORT_SYMBOL(snd_rawmidi_transmit_peek); /* * __snd_rawmidi_transmit_ack - acknowledge the transmission * @substream: the rawmidi substream * @count: the transferred count * * This is a variant of __snd_rawmidi_transmit_ack() without spinlock. */ static int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) { struct snd_rawmidi_runtime *runtime = substream->runtime; if (runtime->buffer == NULL) { rmidi_dbg(substream->rmidi, "snd_rawmidi_transmit_ack: output is not active!!!\n"); return -EINVAL; } snd_BUG_ON(runtime->avail + count > runtime->buffer_size); count = get_aligned_size(runtime, count); runtime->hw_ptr += count; runtime->hw_ptr %= runtime->buffer_size; runtime->avail += count; substream->bytes += count; if (count > 0) { if (runtime->drain || __snd_rawmidi_ready(runtime)) wake_up(&runtime->sleep); } return count; } /** * snd_rawmidi_transmit_ack - acknowledge the transmission * @substream: the rawmidi substream * @count: the transferred count * * Advances the hardware pointer for the internal output buffer with * the given size and updates the condition. * Call after the transmission is finished. * * Return: The advanced size if successful, or a negative error code on failure. */ int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count) { guard(spinlock_irqsave)(&substream->lock); if (!substream->opened || !substream->runtime) return -EBADFD; return __snd_rawmidi_transmit_ack(substream, count); } EXPORT_SYMBOL(snd_rawmidi_transmit_ack); /** * snd_rawmidi_transmit - copy from the buffer to the device * @substream: the rawmidi substream * @buffer: the buffer pointer * @count: the data size to transfer * * Copies data from the buffer to the device and advances the pointer. * * Return: The copied size if successful, or a negative error code on failure. */ int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream, unsigned char *buffer, int count) { guard(spinlock_irqsave)(&substream->lock); if (!substream->opened) return -EBADFD; count = __snd_rawmidi_transmit_peek(substream, buffer, count); if (count <= 0) return count; return __snd_rawmidi_transmit_ack(substream, count); } EXPORT_SYMBOL(snd_rawmidi_transmit); /** * snd_rawmidi_proceed - Discard the all pending bytes and proceed * @substream: rawmidi substream * * Return: the number of discarded bytes */ int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream) { struct snd_rawmidi_runtime *runtime; int count = 0; guard(spinlock_irqsave)(&substream->lock); runtime = substream->runtime; if (substream->opened && runtime && runtime->avail < runtime->buffer_size) { count = runtime->buffer_size - runtime->avail; __snd_rawmidi_transmit_ack(substream, count); } return count; } EXPORT_SYMBOL(snd_rawmidi_proceed); static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream, const unsigned char __user *userbuf, const unsigned char *kernelbuf, long count) { unsigned long flags; long count1, result; struct snd_rawmidi_runtime *runtime = substream->runtime; unsigned long appl_ptr; if (!kernelbuf && !userbuf) return -EINVAL; if (snd_BUG_ON(!runtime->buffer)) return -EINVAL; result = 0; spin_lock_irqsave(&substream->lock, flags); if (substream->append) { if ((long)runtime->avail < count) { spin_unlock_irqrestore(&substream->lock, flags); return -EAGAIN; } } snd_rawmidi_buffer_ref(runtime); while (count > 0 && runtime->avail > 0) { count1 = runtime->buffer_size - runtime->appl_ptr; if (count1 > count) count1 = count; if (count1 > (long)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(runtime->buffer + appl_ptr, kernelbuf + result, count1); else if (userbuf) { spin_unlock_irqrestore(&substream->lock, flags); if (copy_from_user(runtime->buffer + appl_ptr, userbuf + result, count1)) { spin_lock_irqsave(&substream->lock, flags); result = result > 0 ? result : -EFAULT; goto __end; } spin_lock_irqsave(&substream->lock, flags); } result += count1; count -= count1; } __end: count1 = runtime->avail < runtime->buffer_size; snd_rawmidi_buffer_unref(runtime); spin_unlock_irqrestore(&substream->lock, flags); if (count1) snd_rawmidi_output_trigger(substream, 1); return result; } long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream, const unsigned char *buf, long count) { return snd_rawmidi_kernel_write1(substream, NULL, buf, count); } EXPORT_SYMBOL(snd_rawmidi_kernel_write); static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) { long result, timeout; int count1; struct snd_rawmidi_file *rfile; struct snd_rawmidi_runtime *runtime; struct snd_rawmidi_substream *substream; rfile = file->private_data; substream = rfile->output; runtime = substream->runtime; /* we cannot put an atomic message to our buffer */ if (substream->append && count > runtime->buffer_size) return -EIO; result = 0; while (count > 0) { spin_lock_irq(&substream->lock); while (!snd_rawmidi_ready_append(substream, count)) { wait_queue_entry_t wait; if (file->f_flags & O_NONBLOCK) { spin_unlock_irq(&substream->lock); return result > 0 ? result : -EAGAIN; } init_waitqueue_entry(&wait, current); add_wait_queue(&runtime->sleep, &wait); set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irq(&substream->lock); timeout = schedule_timeout(30 * HZ); remove_wait_queue(&runtime->sleep, &wait); if (rfile->rmidi->card->shutdown) return -ENODEV; if (signal_pending(current)) return result > 0 ? result : -ERESTARTSYS; spin_lock_irq(&substream->lock); if (!runtime->avail && !timeout) { spin_unlock_irq(&substream->lock); return result > 0 ? result : -EIO; } } spin_unlock_irq(&substream->lock); count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count); if (count1 < 0) return result > 0 ? result : count1; result += count1; buf += count1; if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK)) break; count -= count1; } if (file->f_flags & O_DSYNC) { spin_lock_irq(&substream->lock); while (runtime->avail != runtime->buffer_size) { wait_queue_entry_t wait; unsigned int last_avail = runtime->avail; init_waitqueue_entry(&wait, current); add_wait_queue(&runtime->sleep, &wait); set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irq(&substream->lock); timeout = schedule_timeout(30 * HZ); remove_wait_queue(&runtime->sleep, &wait); if (signal_pending(current)) return result > 0 ? result : -ERESTARTSYS; if (runtime->avail == last_avail && !timeout) return result > 0 ? result : -EIO; spin_lock_irq(&substream->lock); } spin_unlock_irq(&substream->lock); } return result; } static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait) { struct snd_rawmidi_file *rfile; struct snd_rawmidi_runtime *runtime; __poll_t mask; rfile = file->private_data; if (rfile->input != NULL) { runtime = rfile->input->runtime; snd_rawmidi_input_trigger(rfile->input, 1); poll_wait(file, &runtime->sleep, wait); } if (rfile->output != NULL) { runtime = rfile->output->runtime; poll_wait(file, &runtime->sleep, wait); } mask = 0; if (rfile->input != NULL) { if (snd_rawmidi_ready(rfile->input)) mask |= EPOLLIN | EPOLLRDNORM; } if (rfile->output != NULL) { if (snd_rawmidi_ready(rfile->output)) mask |= EPOLLOUT | EPOLLWRNORM; } return mask; } /* */ #ifdef CONFIG_COMPAT #include "rawmidi_compat.c" #else #define snd_rawmidi_ioctl_compat NULL #endif /* */ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { struct snd_rawmidi *rmidi; struct snd_rawmidi_substream *substream; struct snd_rawmidi_runtime *runtime; unsigned long buffer_size, avail, xruns; unsigned int clock_type; static const char *clock_names[4] = { "none", "realtime", "monotonic", "monotonic raw" }; rmidi = entry->private_data; snd_iprintf(buffer, "%s\n\n", rmidi->name); if (IS_ENABLED(CONFIG_SND_UMP)) snd_iprintf(buffer, "Type: %s\n", rawmidi_is_ump(rmidi) ? "UMP" : "Legacy"); if (rmidi->ops && rmidi->ops->proc_read) rmidi->ops->proc_read(entry, buffer); guard(mutex)(&rmidi->open_mutex); if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) { list_for_each_entry(substream, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams, list) { snd_iprintf(buffer, "Output %d\n" " Tx bytes : %lu\n", substream->number, (unsigned long) substream->bytes); if (substream->opened) { snd_iprintf(buffer, " Owner PID : %d\n", pid_vnr(substream->pid)); runtime = substream->runtime; scoped_guard(spinlock_irq, &substream->lock) { buffer_size = runtime->buffer_size; avail = runtime->avail; } snd_iprintf(buffer, " Mode : %s\n" " Buffer size : %lu\n" " Avail : %lu\n", runtime->oss ? "OSS compatible" : "native", buffer_size, avail); } } } if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) { list_for_each_entry(substream, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams, list) { snd_iprintf(buffer, "Input %d\n" " Rx bytes : %lu\n", substream->number, (unsigned long) substream->bytes); if (substream->opened) { snd_iprintf(buffer, " Owner PID : %d\n", pid_vnr(substream->pid)); runtime = substream->runtime; scoped_guard(spinlock_irq, &substream->lock) { buffer_size = runtime->buffer_size; avail = runtime->avail; xruns = runtime->xruns; } snd_iprintf(buffer, " Buffer size : %lu\n" " Avail : %lu\n" " Overruns : %lu\n", buffer_size, avail, xruns); if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) { clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT; if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names))) snd_iprintf(buffer, " Framing : tstamp\n" " Clock type : %s\n", clock_names[clock_type]); } } } } } /* * Register functions */ static const struct file_operations snd_rawmidi_f_ops = { .owner = THIS_MODULE, .read = snd_rawmidi_read, .write = snd_rawmidi_write, .open = snd_rawmidi_open, .release = snd_rawmidi_release, .llseek = no_llseek, .poll = snd_rawmidi_poll, .unlocked_ioctl = snd_rawmidi_ioctl, .compat_ioctl = snd_rawmidi_ioctl_compat, }; static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi, struct snd_rawmidi_str *stream, int direction, int count) { struct snd_rawmidi_substream *substream; int idx; for (idx = 0; idx < count; idx++) { substream = kzalloc(sizeof(*substream), GFP_KERNEL); if (!substream) return -ENOMEM; substream->stream = direction; substream->number = idx; substream->rmidi = rmidi; substream->pstr = stream; spin_lock_init(&substream->lock); list_add_tail(&substream->list, &stream->substreams); stream->substream_count++; } return 0; } /* used for both rawmidi and ump */ int snd_rawmidi_init(struct snd_rawmidi *rmidi, struct snd_card *card, char *id, int device, int output_count, int input_count, unsigned int info_flags) { int err; static const struct snd_device_ops ops = { .dev_free = snd_rawmidi_dev_free, .dev_register = snd_rawmidi_dev_register, .dev_disconnect = snd_rawmidi_dev_disconnect, }; rmidi->card = card; rmidi->device = device; mutex_init(&rmidi->open_mutex); init_waitqueue_head(&rmidi->open_wait); INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams); INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams); rmidi->info_flags = info_flags; if (id != NULL) strscpy(rmidi->id, id, sizeof(rmidi->id)); err = snd_device_alloc(&rmidi->dev, card); if (err < 0) return err; if (rawmidi_is_ump(rmidi)) dev_set_name(rmidi->dev, "umpC%iD%i", card->number, device); else dev_set_name(rmidi->dev, "midiC%iD%i", card->number, device); err = snd_rawmidi_alloc_substreams(rmidi, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT], SNDRV_RAWMIDI_STREAM_INPUT, input_count); if (err < 0) return err; err = snd_rawmidi_alloc_substreams(rmidi, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], SNDRV_RAWMIDI_STREAM_OUTPUT, output_count); if (err < 0) return err; err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops); if (err < 0) return err; return 0; } EXPORT_SYMBOL_GPL(snd_rawmidi_init); /** * snd_rawmidi_new - create a rawmidi instance * @card: the card instance * @id: the id string * @device: the device index * @output_count: the number of output streams * @input_count: the number of input streams * @rrawmidi: the pointer to store the new rawmidi instance * * Creates a new rawmidi instance. * Use snd_rawmidi_set_ops() to set the operators to the new instance. * * Return: Zero if successful, or a negative error code on failure. */ int snd_rawmidi_new(struct snd_card *card, char *id, int device, int output_count, int input_count, struct snd_rawmidi **rrawmidi) { struct snd_rawmidi *rmidi; int err; if (rrawmidi) *rrawmidi = NULL; rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL); if (!rmidi) return -ENOMEM; err = snd_rawmidi_init(rmidi, card, id, device, output_count, input_count, 0); if (err < 0) { snd_rawmidi_free(rmidi); return err; } if (rrawmidi) *rrawmidi = rmidi; return 0; } EXPORT_SYMBOL(snd_rawmidi_new); static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream) { struct snd_rawmidi_substream *substream; while (!list_empty(&stream->substreams)) { substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list); list_del(&substream->list); kfree(substream); } } /* called from ump.c, too */ int snd_rawmidi_free(struct snd_rawmidi *rmidi) { if (!rmidi) return 0; snd_info_free_entry(rmidi->proc_entry); rmidi->proc_entry = NULL; if (rmidi->ops && rmidi->ops->dev_unregister) rmidi->ops->dev_unregister(rmidi); snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]); if (rmidi->private_free) rmidi->private_free(rmidi); put_device(rmidi->dev); kfree(rmidi); return 0; } EXPORT_SYMBOL_GPL(snd_rawmidi_free); static int snd_rawmidi_dev_free(struct snd_device *device) { struct snd_rawmidi *rmidi = device->device_data; return snd_rawmidi_free(rmidi); } #if IS_ENABLED(CONFIG_SND_SEQUENCER) static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device) { struct snd_rawmidi *rmidi = device->private_data; rmidi->seq_dev = NULL; } #endif static int snd_rawmidi_dev_register(struct snd_device *device) { int err; struct snd_info_entry *entry; char name[16]; struct snd_rawmidi *rmidi = device->device_data; if (rmidi->device >= SNDRV_RAWMIDI_DEVICES) return -ENOMEM; err = 0; scoped_guard(mutex, ®ister_mutex) { if (snd_rawmidi_search(rmidi->card, rmidi->device)) err = -EBUSY; else list_add_tail(&rmidi->list, &snd_rawmidi_devices); } if (err < 0) return err; err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device, &snd_rawmidi_f_ops, rmidi, rmidi->dev); if (err < 0) { rmidi_err(rmidi, "unable to register\n"); goto error; } if (rmidi->ops && rmidi->ops->dev_register) { err = rmidi->ops->dev_register(rmidi); if (err < 0) goto error_unregister; } #ifdef CONFIG_SND_OSSEMUL rmidi->ossreg = 0; if (!rawmidi_is_ump(rmidi) && (int)rmidi->device == midi_map[rmidi->card->number]) { if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0, &snd_rawmidi_f_ops, rmidi) < 0) { rmidi_err(rmidi, "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0); } else { rmidi->ossreg++; #ifdef SNDRV_OSS_INFO_DEV_MIDI snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name); #endif } } if (!rawmidi_is_ump(rmidi) && (int)rmidi->device == amidi_map[rmidi->card->number]) { if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1, &snd_rawmidi_f_ops, rmidi) < 0) { rmidi_err(rmidi, "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1); } else { rmidi->ossreg++; } } #endif /* CONFIG_SND_OSSEMUL */ sprintf(name, "midi%d", rmidi->device); entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root); if (entry) { entry->private_data = rmidi; entry->c.text.read = snd_rawmidi_proc_info_read; if (snd_info_register(entry) < 0) { snd_info_free_entry(entry); entry = NULL; } } rmidi->proc_entry = entry; #if IS_ENABLED(CONFIG_SND_SEQUENCER) /* no own registration mechanism? */ if (!rmidi->ops || !rmidi->ops->dev_register) { if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) { rmidi->seq_dev->private_data = rmidi; rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free; sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device); snd_device_register(rmidi->card, rmidi->seq_dev); } } #endif return 0; error_unregister: snd_unregister_device(rmidi->dev); error: scoped_guard(mutex, ®ister_mutex) list_del(&rmidi->list); return err; } static int snd_rawmidi_dev_disconnect(struct snd_device *device) { struct snd_rawmidi *rmidi = device->device_data; int dir; guard(mutex)(®ister_mutex); guard(mutex)(&rmidi->open_mutex); wake_up(&rmidi->open_wait); list_del_init(&rmidi->list); for (dir = 0; dir < 2; dir++) { struct snd_rawmidi_substream *s; list_for_each_entry(s, &rmidi->streams[dir].substreams, list) { if (s->runtime) wake_up(&s->runtime->sleep); } } #ifdef CONFIG_SND_OSSEMUL if (rmidi->ossreg) { if ((int)rmidi->device == midi_map[rmidi->card->number]) { snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0); #ifdef SNDRV_OSS_INFO_DEV_MIDI snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number); #endif } if ((int)rmidi->device == amidi_map[rmidi->card->number]) snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1); rmidi->ossreg = 0; } #endif /* CONFIG_SND_OSSEMUL */ snd_unregister_device(rmidi->dev); return 0; } /** * snd_rawmidi_set_ops - set the rawmidi operators * @rmidi: the rawmidi instance * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX * @ops: the operator table * * Sets the rawmidi operators for the given stream direction. */ void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream, const struct snd_rawmidi_ops *ops) { struct snd_rawmidi_substream *substream; list_for_each_entry(substream, &rmidi->streams[stream].substreams, list) substream->ops = ops; } EXPORT_SYMBOL(snd_rawmidi_set_ops); /* * ENTRY functions */ static int __init alsa_rawmidi_init(void) { snd_ctl_register_ioctl(snd_rawmidi_control_ioctl); snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl); #ifdef CONFIG_SND_OSSEMUL { int i; /* check device map table */ for (i = 0; i < SNDRV_CARDS; i++) { if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) { pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n", i, midi_map[i]); midi_map[i] = 0; } if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) { pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n", i, amidi_map[i]); amidi_map[i] = 1; } } } #endif /* CONFIG_SND_OSSEMUL */ return 0; } static void __exit alsa_rawmidi_exit(void) { snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl); snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl); } module_init(alsa_rawmidi_init) module_exit(alsa_rawmidi_exit)
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