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![Takashi Iwai](/assets/img/avatar_default.png)
This patch detaches the struct device from the snd_rawmidi object by allocating via snd_device_alloc(), just like done for other devices. Reviewed-by: Jaroslav Kysela <perex@perex.cz> Signed-off-by: Curtis Malainey <cujomalainey@chromium.org> Tested-by: Curtis Malainey <cujomalainey@chromium.org> Link: https://lore.kernel.org/r/20230816160252.23396-6-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
2202 lines
60 KiB
C
2202 lines
60 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Abstract layer for MIDI v1.0 stream
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*/
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#include <sound/core.h>
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#include <linux/major.h>
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#include <linux/init.h>
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#include <linux/sched/signal.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/wait.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/mm.h>
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#include <linux/nospec.h>
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#include <sound/rawmidi.h>
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#include <sound/info.h>
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#include <sound/control.h>
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#include <sound/minors.h>
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#include <sound/initval.h>
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#include <sound/ump.h>
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
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MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
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MODULE_LICENSE("GPL");
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#ifdef CONFIG_SND_OSSEMUL
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static int midi_map[SNDRV_CARDS];
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static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
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module_param_array(midi_map, int, NULL, 0444);
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MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
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module_param_array(amidi_map, int, NULL, 0444);
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MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
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#endif /* CONFIG_SND_OSSEMUL */
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static int snd_rawmidi_dev_free(struct snd_device *device);
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static int snd_rawmidi_dev_register(struct snd_device *device);
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static int snd_rawmidi_dev_disconnect(struct snd_device *device);
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static LIST_HEAD(snd_rawmidi_devices);
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static DEFINE_MUTEX(register_mutex);
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#define rmidi_err(rmidi, fmt, args...) \
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dev_err((rmidi)->dev, fmt, ##args)
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#define rmidi_warn(rmidi, fmt, args...) \
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dev_warn((rmidi)->dev, fmt, ##args)
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#define rmidi_dbg(rmidi, fmt, args...) \
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dev_dbg((rmidi)->dev, fmt, ##args)
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struct snd_rawmidi_status32 {
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s32 stream;
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s32 tstamp_sec; /* Timestamp */
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s32 tstamp_nsec;
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u32 avail; /* available bytes */
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u32 xruns; /* count of overruns since last status (in bytes) */
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unsigned char reserved[16]; /* reserved for future use */
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};
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#define SNDRV_RAWMIDI_IOCTL_STATUS32 _IOWR('W', 0x20, struct snd_rawmidi_status32)
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struct snd_rawmidi_status64 {
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int stream;
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u8 rsvd[4]; /* alignment */
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s64 tstamp_sec; /* Timestamp */
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s64 tstamp_nsec;
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size_t avail; /* available bytes */
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size_t xruns; /* count of overruns since last status (in bytes) */
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unsigned char reserved[16]; /* reserved for future use */
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};
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#define SNDRV_RAWMIDI_IOCTL_STATUS64 _IOWR('W', 0x20, struct snd_rawmidi_status64)
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#define rawmidi_is_ump(rmidi) \
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(IS_ENABLED(CONFIG_SND_UMP) && ((rmidi)->info_flags & SNDRV_RAWMIDI_INFO_UMP))
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static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
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{
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struct snd_rawmidi *rawmidi;
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list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
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if (rawmidi->card == card && rawmidi->device == device)
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return rawmidi;
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return NULL;
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}
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static inline unsigned short snd_rawmidi_file_flags(struct file *file)
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{
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switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
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case FMODE_WRITE:
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return SNDRV_RAWMIDI_LFLG_OUTPUT;
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case FMODE_READ:
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return SNDRV_RAWMIDI_LFLG_INPUT;
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default:
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return SNDRV_RAWMIDI_LFLG_OPEN;
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}
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}
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static inline bool __snd_rawmidi_ready(struct snd_rawmidi_runtime *runtime)
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{
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return runtime->avail >= runtime->avail_min;
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}
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static bool snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
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{
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unsigned long flags;
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bool ready;
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spin_lock_irqsave(&substream->lock, flags);
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ready = __snd_rawmidi_ready(substream->runtime);
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spin_unlock_irqrestore(&substream->lock, flags);
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return ready;
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}
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static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
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size_t count)
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{
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struct snd_rawmidi_runtime *runtime = substream->runtime;
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return runtime->avail >= runtime->avail_min &&
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(!substream->append || runtime->avail >= count);
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}
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static void snd_rawmidi_input_event_work(struct work_struct *work)
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{
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struct snd_rawmidi_runtime *runtime =
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container_of(work, struct snd_rawmidi_runtime, event_work);
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if (runtime->event)
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runtime->event(runtime->substream);
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}
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/* buffer refcount management: call with substream->lock held */
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static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
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{
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runtime->buffer_ref++;
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}
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static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
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{
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runtime->buffer_ref--;
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}
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static void snd_rawmidi_buffer_ref_sync(struct snd_rawmidi_substream *substream)
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{
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int loop = HZ;
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spin_lock_irq(&substream->lock);
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while (substream->runtime->buffer_ref) {
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spin_unlock_irq(&substream->lock);
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if (!--loop) {
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rmidi_err(substream->rmidi, "Buffer ref sync timeout\n");
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return;
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}
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schedule_timeout_uninterruptible(1);
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spin_lock_irq(&substream->lock);
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}
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spin_unlock_irq(&substream->lock);
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}
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static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
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{
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struct snd_rawmidi_runtime *runtime;
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runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
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if (!runtime)
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return -ENOMEM;
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runtime->substream = substream;
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init_waitqueue_head(&runtime->sleep);
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INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
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runtime->event = NULL;
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runtime->buffer_size = PAGE_SIZE;
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runtime->avail_min = 1;
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if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
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runtime->avail = 0;
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else
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runtime->avail = runtime->buffer_size;
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runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
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if (!runtime->buffer) {
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kfree(runtime);
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return -ENOMEM;
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}
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runtime->appl_ptr = runtime->hw_ptr = 0;
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substream->runtime = runtime;
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if (rawmidi_is_ump(substream->rmidi))
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runtime->align = 3;
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return 0;
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}
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/* get the current alignment (either 0 or 3) */
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static inline int get_align(struct snd_rawmidi_runtime *runtime)
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{
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if (IS_ENABLED(CONFIG_SND_UMP))
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return runtime->align;
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else
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return 0;
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}
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/* get the trimmed size with the current alignment */
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#define get_aligned_size(runtime, size) ((size) & ~get_align(runtime))
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static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
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{
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struct snd_rawmidi_runtime *runtime = substream->runtime;
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kvfree(runtime->buffer);
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kfree(runtime);
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substream->runtime = NULL;
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return 0;
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}
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static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
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{
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if (!substream->opened)
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return;
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substream->ops->trigger(substream, up);
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}
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static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
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{
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if (!substream->opened)
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return;
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substream->ops->trigger(substream, up);
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if (!up)
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cancel_work_sync(&substream->runtime->event_work);
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}
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static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
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bool is_input)
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{
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runtime->drain = 0;
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runtime->appl_ptr = runtime->hw_ptr = 0;
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runtime->avail = is_input ? 0 : runtime->buffer_size;
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}
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static void reset_runtime_ptrs(struct snd_rawmidi_substream *substream,
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bool is_input)
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{
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unsigned long flags;
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spin_lock_irqsave(&substream->lock, flags);
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if (substream->opened && substream->runtime)
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__reset_runtime_ptrs(substream->runtime, is_input);
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spin_unlock_irqrestore(&substream->lock, flags);
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}
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int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
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{
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snd_rawmidi_output_trigger(substream, 0);
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reset_runtime_ptrs(substream, false);
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return 0;
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}
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EXPORT_SYMBOL(snd_rawmidi_drop_output);
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int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
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{
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int err = 0;
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long timeout;
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struct snd_rawmidi_runtime *runtime;
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spin_lock_irq(&substream->lock);
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runtime = substream->runtime;
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if (!substream->opened || !runtime || !runtime->buffer) {
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err = -EINVAL;
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} else {
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snd_rawmidi_buffer_ref(runtime);
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runtime->drain = 1;
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}
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spin_unlock_irq(&substream->lock);
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if (err < 0)
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return err;
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timeout = wait_event_interruptible_timeout(runtime->sleep,
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(runtime->avail >= runtime->buffer_size),
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10*HZ);
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spin_lock_irq(&substream->lock);
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if (signal_pending(current))
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err = -ERESTARTSYS;
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if (runtime->avail < runtime->buffer_size && !timeout) {
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rmidi_warn(substream->rmidi,
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"rawmidi drain error (avail = %li, buffer_size = %li)\n",
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(long)runtime->avail, (long)runtime->buffer_size);
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err = -EIO;
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}
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runtime->drain = 0;
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spin_unlock_irq(&substream->lock);
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if (err != -ERESTARTSYS) {
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/* we need wait a while to make sure that Tx FIFOs are empty */
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if (substream->ops->drain)
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substream->ops->drain(substream);
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else
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msleep(50);
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snd_rawmidi_drop_output(substream);
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}
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spin_lock_irq(&substream->lock);
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snd_rawmidi_buffer_unref(runtime);
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spin_unlock_irq(&substream->lock);
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return err;
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}
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EXPORT_SYMBOL(snd_rawmidi_drain_output);
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int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
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{
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snd_rawmidi_input_trigger(substream, 0);
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reset_runtime_ptrs(substream, true);
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return 0;
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}
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EXPORT_SYMBOL(snd_rawmidi_drain_input);
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/* look for an available substream for the given stream direction;
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* if a specific subdevice is given, try to assign it
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*/
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static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
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int stream, int mode,
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struct snd_rawmidi_substream **sub_ret)
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{
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struct snd_rawmidi_substream *substream;
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struct snd_rawmidi_str *s = &rmidi->streams[stream];
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static const unsigned int info_flags[2] = {
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[SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
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[SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
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};
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if (!(rmidi->info_flags & info_flags[stream]))
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return -ENXIO;
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if (subdevice >= 0 && subdevice >= s->substream_count)
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return -ENODEV;
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list_for_each_entry(substream, &s->substreams, list) {
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if (substream->opened) {
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if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
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!(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
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!substream->append)
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continue;
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}
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if (subdevice < 0 || subdevice == substream->number) {
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*sub_ret = substream;
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return 0;
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}
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}
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return -EAGAIN;
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}
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/* open and do ref-counting for the given substream */
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static int open_substream(struct snd_rawmidi *rmidi,
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struct snd_rawmidi_substream *substream,
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int mode)
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{
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int err;
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if (substream->use_count == 0) {
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err = snd_rawmidi_runtime_create(substream);
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if (err < 0)
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return err;
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err = substream->ops->open(substream);
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if (err < 0) {
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snd_rawmidi_runtime_free(substream);
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return err;
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}
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spin_lock_irq(&substream->lock);
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substream->opened = 1;
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substream->active_sensing = 0;
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if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
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substream->append = 1;
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substream->pid = get_pid(task_pid(current));
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rmidi->streams[substream->stream].substream_opened++;
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spin_unlock_irq(&substream->lock);
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}
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substream->use_count++;
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return 0;
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}
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static void close_substream(struct snd_rawmidi *rmidi,
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struct snd_rawmidi_substream *substream,
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int cleanup);
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static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
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struct snd_rawmidi_file *rfile)
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{
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struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
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int err;
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rfile->input = rfile->output = NULL;
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if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
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err = assign_substream(rmidi, subdevice,
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SNDRV_RAWMIDI_STREAM_INPUT,
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mode, &sinput);
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if (err < 0)
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return err;
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}
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if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
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err = assign_substream(rmidi, subdevice,
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SNDRV_RAWMIDI_STREAM_OUTPUT,
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mode, &soutput);
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if (err < 0)
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return err;
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}
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if (sinput) {
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err = open_substream(rmidi, sinput, mode);
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if (err < 0)
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return err;
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}
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if (soutput) {
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err = open_substream(rmidi, soutput, mode);
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if (err < 0) {
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if (sinput)
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close_substream(rmidi, sinput, 0);
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return err;
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}
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}
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rfile->rmidi = rmidi;
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rfile->input = sinput;
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rfile->output = soutput;
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return 0;
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}
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/* called from sound/core/seq/seq_midi.c */
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int snd_rawmidi_kernel_open(struct snd_rawmidi *rmidi, int subdevice,
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int mode, struct snd_rawmidi_file *rfile)
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{
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int err;
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if (snd_BUG_ON(!rfile))
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return -EINVAL;
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if (!try_module_get(rmidi->card->module))
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return -ENXIO;
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mutex_lock(&rmidi->open_mutex);
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err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
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mutex_unlock(&rmidi->open_mutex);
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if (err < 0)
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module_put(rmidi->card->module);
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return err;
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}
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EXPORT_SYMBOL(snd_rawmidi_kernel_open);
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static int snd_rawmidi_open(struct inode *inode, struct file *file)
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{
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int maj = imajor(inode);
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struct snd_card *card;
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int subdevice;
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unsigned short fflags;
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int err;
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struct snd_rawmidi *rmidi;
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struct snd_rawmidi_file *rawmidi_file = NULL;
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wait_queue_entry_t wait;
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if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
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return -EINVAL; /* invalid combination */
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err = stream_open(inode, file);
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if (err < 0)
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return err;
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if (maj == snd_major) {
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rmidi = snd_lookup_minor_data(iminor(inode),
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SNDRV_DEVICE_TYPE_RAWMIDI);
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#ifdef CONFIG_SND_OSSEMUL
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} else if (maj == SOUND_MAJOR) {
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rmidi = snd_lookup_oss_minor_data(iminor(inode),
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SNDRV_OSS_DEVICE_TYPE_MIDI);
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#endif
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} else
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return -ENXIO;
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if (rmidi == NULL)
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return -ENODEV;
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if (!try_module_get(rmidi->card->module)) {
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snd_card_unref(rmidi->card);
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return -ENXIO;
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}
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mutex_lock(&rmidi->open_mutex);
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card = rmidi->card;
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err = snd_card_file_add(card, file);
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if (err < 0)
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goto __error_card;
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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);
|
|
}
|
|
spin_lock_irq(&substream->lock);
|
|
substream->opened = 0;
|
|
substream->append = 0;
|
|
spin_unlock_irq(&substream->lock);
|
|
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;
|
|
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_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;
|
|
spin_lock_irq(&substream->lock);
|
|
if (runtime->buffer_ref) {
|
|
spin_unlock_irq(&substream->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(&substream->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)
|
|
{
|
|
int err;
|
|
|
|
snd_rawmidi_drain_output(substream);
|
|
mutex_lock(&substream->rmidi->open_mutex);
|
|
if (substream->append && substream->use_count > 1)
|
|
err = -EBUSY;
|
|
else
|
|
err = resize_runtime_buffer(substream, params, false);
|
|
|
|
if (!err)
|
|
substream->active_sensing = !params->no_active_sensing;
|
|
mutex_unlock(&substream->rmidi->open_mutex);
|
|
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);
|
|
mutex_lock(&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;
|
|
}
|
|
mutex_unlock(&substream->rmidi->open_mutex);
|
|
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;
|
|
spin_lock_irq(&substream->lock);
|
|
status->avail = runtime->avail;
|
|
spin_unlock_irq(&substream->lock);
|
|
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;
|
|
spin_lock_irq(&substream->lock);
|
|
status->avail = runtime->avail;
|
|
status->xruns = runtime->xruns;
|
|
runtime->xruns = 0;
|
|
spin_unlock_irq(&substream->lock);
|
|
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;
|
|
mutex_lock(®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;
|
|
mutex_unlock(®ister_mutex);
|
|
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, ret;
|
|
|
|
if (get_user(device, &info->device))
|
|
return -EFAULT;
|
|
mutex_lock(®ister_mutex);
|
|
rmidi = snd_rawmidi_search(card, device);
|
|
if (rmidi && rmidi->ops && rmidi->ops->ioctl)
|
|
ret = rmidi->ops->ioctl(rmidi, cmd, argp);
|
|
else
|
|
ret = -ENXIO;
|
|
mutex_unlock(®ister_mutex);
|
|
return ret;
|
|
}
|
|
#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)
|
|
{
|
|
unsigned long flags;
|
|
struct timespec64 ts64 = get_framing_tstamp(substream);
|
|
int result = 0, count1;
|
|
struct snd_rawmidi_runtime *runtime;
|
|
|
|
spin_lock_irqsave(&substream->lock, flags);
|
|
if (!substream->opened) {
|
|
result = -EBADFD;
|
|
goto unlock;
|
|
}
|
|
runtime = substream->runtime;
|
|
if (!runtime || !runtime->buffer) {
|
|
rmidi_dbg(substream->rmidi,
|
|
"snd_rawmidi_receive: input is not active!!!\n");
|
|
result = -EINVAL;
|
|
goto unlock;
|
|
}
|
|
|
|
count = get_aligned_size(runtime, count);
|
|
if (!count)
|
|
goto unlock;
|
|
|
|
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)
|
|
goto unlock;
|
|
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);
|
|
}
|
|
unlock:
|
|
spin_unlock_irqrestore(&substream->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(&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;
|
|
int result;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&substream->lock, flags);
|
|
runtime = substream->runtime;
|
|
if (!substream->opened || !runtime || !runtime->buffer) {
|
|
rmidi_dbg(substream->rmidi,
|
|
"snd_rawmidi_transmit_empty: output is not active!!!\n");
|
|
result = 1;
|
|
} else {
|
|
result = runtime->avail >= runtime->buffer_size;
|
|
}
|
|
spin_unlock_irqrestore(&substream->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.
|
|
*/
|
|
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)
|
|
{
|
|
int result;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&substream->lock, flags);
|
|
if (!substream->opened || !substream->runtime)
|
|
result = -EBADFD;
|
|
else
|
|
result = __snd_rawmidi_transmit_peek(substream, buffer, count);
|
|
spin_unlock_irqrestore(&substream->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.
|
|
*/
|
|
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)
|
|
{
|
|
int result;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&substream->lock, flags);
|
|
if (!substream->opened || !substream->runtime)
|
|
result = -EBADFD;
|
|
else
|
|
result = __snd_rawmidi_transmit_ack(substream, count);
|
|
spin_unlock_irqrestore(&substream->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)
|
|
{
|
|
int result;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&substream->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(&substream->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;
|
|
unsigned long flags;
|
|
int count = 0;
|
|
|
|
spin_lock_irqsave(&substream->lock, flags);
|
|
runtime = substream->runtime;
|
|
if (substream->opened && runtime &&
|
|
runtime->avail < runtime->buffer_size) {
|
|
count = runtime->buffer_size - runtime->avail;
|
|
__snd_rawmidi_transmit_ack(substream, count);
|
|
}
|
|
spin_unlock_irqrestore(&substream->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(&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->proc_read)
|
|
rmidi->ops->proc_read(entry, buffer);
|
|
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;
|
|
spin_lock_irq(&substream->lock);
|
|
buffer_size = runtime->buffer_size;
|
|
avail = runtime->avail;
|
|
spin_unlock_irq(&substream->lock);
|
|
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;
|
|
spin_lock_irq(&substream->lock);
|
|
buffer_size = runtime->buffer_size;
|
|
avail = runtime->avail;
|
|
xruns = runtime->xruns;
|
|
spin_unlock_irq(&substream->lock);
|
|
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]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
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;
|
|
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;
|
|
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 (!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:
|
|
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)
|