| // 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); |
| } |
| |
| /* buffer refcount management: call with runtime->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 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); |
| if (runtime->buffer_ref) { |
| spin_unlock_irq(&runtime->lock); |
| kvfree(newbuf); |
| return -EBUSY; |
| } |
| 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; |
| int err = 0; |
| |
| spin_lock_irqsave(&runtime->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(&runtime->lock, flags); |
| if (copy_to_user(userbuf + result, |
| runtime->buffer + appl_ptr, count1)) |
| err = -EFAULT; |
| spin_lock_irqsave(&runtime->lock, flags); |
| if (err) |
| goto out; |
| } |
| result += count1; |
| count -= count1; |
| } |
| out: |
| snd_rawmidi_buffer_unref(runtime); |
| spin_unlock_irqrestore(&runtime->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(&runtime->lock); |
| while (!snd_rawmidi_ready(substream)) { |
| wait_queue_entry_t wait; |
| |
| if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { |
| spin_unlock_irq(&runtime->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(&runtime->lock); |
| schedule(); |
| remove_wait_queue(&runtime->sleep, &wait); |
| if (rfile->rmidi->card->shutdown) |
| return -ENODEV; |
| if (signal_pending(current)) |
| return result > 0 ? result : -ERESTARTSYS; |
| if (!runtime->avail) |
| return result > 0 ? result : -EIO; |
| spin_lock_irq(&runtime->lock); |
| } |
| spin_unlock_irq(&runtime->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 = substream->runtime; |
| int result; |
| unsigned long flags; |
| |
| if (runtime->buffer == NULL) { |
| rmidi_dbg(substream->rmidi, |
| "snd_rawmidi_transmit_empty: output is not active!!!\n"); |
| return 1; |
| } |
| spin_lock_irqsave(&runtime->lock, flags); |
| result = runtime->avail >= runtime->buffer_size; |
| spin_unlock_irqrestore(&runtime->lock, flags); |
| return result; |
| } |
| 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. |
| */ |
| 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; |
| 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; |
| memcpy(buffer + count1, runtime->buffer, count); |
| result += count; |
| } |
| } |
| __skip: |
| return result; |
| } |
| EXPORT_SYMBOL(__snd_rawmidi_transmit_peek); |
| |
| /** |
| * 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) |
| { |
| struct snd_rawmidi_runtime *runtime = substream->runtime; |
| int result; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&runtime->lock, flags); |
| result = __snd_rawmidi_transmit_peek(substream, buffer, count); |
| spin_unlock_irqrestore(&runtime->lock, flags); |
| return result; |
| } |
| 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. |
| */ |
| 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); |
| 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(substream)) |
| wake_up(&runtime->sleep); |
| } |
| return count; |
| } |
| EXPORT_SYMBOL(__snd_rawmidi_transmit_ack); |
| |
| /** |
| * 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) |
| { |
| struct snd_rawmidi_runtime *runtime = substream->runtime; |
| int result; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&runtime->lock, flags); |
| result = __snd_rawmidi_transmit_ack(substream, count); |
| spin_unlock_irqrestore(&runtime->lock, flags); |
| return result; |
| } |
| 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) |
| { |
| struct snd_rawmidi_runtime *runtime = substream->runtime; |
| int result; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&runtime->lock, flags); |
| if (!substream->opened) |
| result = -EBADFD; |
| else { |
| count = __snd_rawmidi_transmit_peek(substream, buffer, count); |
| if (count <= 0) |
| result = count; |
| else |
| result = __snd_rawmidi_transmit_ack(substream, count); |
| } |
| spin_unlock_irqrestore(&runtime->lock, flags); |
| return result; |
| } |
| 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 = substream->runtime; |
| unsigned long flags; |
| int count = 0; |
| |
| spin_lock_irqsave(&runtime->lock, flags); |
| if (runtime->avail < runtime->buffer_size) { |
| count = runtime->buffer_size - runtime->avail; |
| __snd_rawmidi_transmit_ack(substream, count); |
| } |
| spin_unlock_irqrestore(&runtime->lock, flags); |
| 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(&runtime->lock, flags); |
| if (substream->append) { |
| if ((long)runtime->avail < count) { |
| spin_unlock_irqrestore(&runtime->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(&runtime->lock, flags); |
| if (copy_from_user(runtime->buffer + appl_ptr, |
| userbuf + result, count1)) { |
| spin_lock_irqsave(&runtime->lock, flags); |
| result = result > 0 ? result : -EFAULT; |
| goto __end; |
| } |
| spin_lock_irqsave(&runtime->lock, flags); |
| } |
| result += count1; |
| count -= count1; |
| } |
| __end: |
| count1 = runtime->avail < runtime->buffer_size; |
| snd_rawmidi_buffer_unref(runtime); |
| spin_unlock_irqrestore(&runtime->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(&runtime->lock); |
| while (!snd_rawmidi_ready_append(substream, count)) { |
| wait_queue_entry_t wait; |
| |
| if (file->f_flags & O_NONBLOCK) { |
| spin_unlock_irq(&runtime->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(&runtime->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; |
| if (!runtime->avail && !timeout) |
| return result > 0 ? result : -EIO; |
| spin_lock_irq(&runtime->lock); |
| } |
| spin_unlock_irq(&runtime->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(&runtime->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(&runtime->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(&runtime->lock); |
| } |
| spin_unlock_irq(&runtime->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; |
| |
| rmidi = entry->private_data; |
| snd_iprintf(buffer, "%s\n\n", rmidi->name); |
| mutex_lock(&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; |
| snd_iprintf(buffer, |
| " Mode : %s\n" |
| " Buffer size : %lu\n" |
| " Avail : %lu\n", |
| runtime->oss ? "OSS compatible" : "native", |
| (unsigned long) runtime->buffer_size, |
| (unsigned long) runtime->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; |
| snd_iprintf(buffer, |
| " Buffer size : %lu\n" |
| " Avail : %lu\n" |
| " Overruns : %lu\n", |
| (unsigned long) runtime->buffer_size, |
| (unsigned long) runtime->avail, |
| (unsigned long) runtime->xruns); |
| } |
| } |
| } |
| mutex_unlock(&rmidi->open_mutex); |
| } |
| |
| /* |
| * 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; |
| list_add_tail(&substream->list, &stream->substreams); |
| stream->substream_count++; |
| } |
| return 0; |
| } |
| |
| static void release_rawmidi_device(struct device *dev) |
| { |
| kfree(container_of(dev, struct snd_rawmidi, dev)); |
| } |
| |
| /** |
| * 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; |
| static struct snd_device_ops ops = { |
| .dev_free = snd_rawmidi_dev_free, |
| .dev_register = snd_rawmidi_dev_register, |
| .dev_disconnect = snd_rawmidi_dev_disconnect, |
| }; |
| |
| if (snd_BUG_ON(!card)) |
| return -ENXIO; |
| if (rrawmidi) |
| *rrawmidi = NULL; |
| rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL); |
| if (!rmidi) |
| return -ENOMEM; |
| 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); |
| |
| if (id != NULL) |
| strlcpy(rmidi->id, id, sizeof(rmidi->id)); |
| |
| snd_device_initialize(&rmidi->dev, card); |
| rmidi->dev.release = release_rawmidi_device; |
| 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) |
| goto error; |
| err = snd_rawmidi_alloc_substreams(rmidi, |
| &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT], |
| SNDRV_RAWMIDI_STREAM_OUTPUT, |
| output_count); |
| if (err < 0) |
| goto error; |
| err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops); |
| if (err < 0) |
| goto error; |
| |
| if (rrawmidi) |
| *rrawmidi = rmidi; |
| return 0; |
| |
| error: |
| snd_rawmidi_free(rmidi); |
| return err; |
| } |
| 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); |
| } |
| } |
| |
| static int snd_rawmidi_free(struct snd_rawmidi *rmidi) |
| { |
| if (!rmidi) |
| return 0; |
| |
| snd_info_free_entry(rmidi->proc_entry); |
| rmidi->proc_entry = NULL; |
| mutex_lock(®ister_mutex); |
| if (rmidi->ops && rmidi->ops->dev_unregister) |
| rmidi->ops->dev_unregister(rmidi); |
| mutex_unlock(®ister_mutex); |
| |
| 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); |
| return 0; |
| } |
| |
| 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; |
| mutex_lock(®ister_mutex); |
| if (snd_rawmidi_search(rmidi->card, rmidi->device)) |
| err = -EBUSY; |
| else |
| list_add_tail(&rmidi->list, &snd_rawmidi_devices); |
| mutex_unlock(®ister_mutex); |
| 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 ((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 ((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) |
| if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */ |
| 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: |
| mutex_lock(®ister_mutex); |
| list_del(&rmidi->list); |
| mutex_unlock(®ister_mutex); |
| return err; |
| } |
| |
| static int snd_rawmidi_dev_disconnect(struct snd_device *device) |
| { |
| struct snd_rawmidi *rmidi = device->device_data; |
| int dir; |
| |
| mutex_lock(®ister_mutex); |
| mutex_lock(&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); |
| mutex_unlock(&rmidi->open_mutex); |
| mutex_unlock(®ister_mutex); |
| 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) |