cregit-Linux how code gets into the kernel

Release 4.7 sound/firewire/tascam/tascam-hwdep.c

/*
 * tascam-hwdep.c - a part of driver for TASCAM FireWire series
 *
 * Copyright (c) 2015 Takashi Sakamoto
 *
 * Licensed under the terms of the GNU General Public License, version 2.
 */

/*
 * This codes give three functionality.
 *
 * 1.get firewire node information
 * 2.get notification about starting/stopping stream
 * 3.lock/unlock stream
 */

#include "tascam.h"


static long hwdep_read_locked(struct snd_tscm *tscm, char __user *buf, long count) { union snd_firewire_event event; memset(&event, 0, sizeof(event)); event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS; event.lock_status.status = (tscm->dev_lock_count > 0); tscm->dev_lock_changed = false; count = min_t(long, count, sizeof(event.lock_status)); if (copy_to_user(buf, &event, count)) return -EFAULT; return count; }

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static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count, loff_t *offset) { struct snd_tscm *tscm = hwdep->private_data; DEFINE_WAIT(wait); union snd_firewire_event event; spin_lock_irq(&tscm->lock); while (!tscm->dev_lock_changed) { prepare_to_wait(&tscm->hwdep_wait, &wait, TASK_INTERRUPTIBLE); spin_unlock_irq(&tscm->lock); schedule(); finish_wait(&tscm->hwdep_wait, &wait); if (signal_pending(current)) return -ERESTARTSYS; spin_lock_irq(&tscm->lock); } memset(&event, 0, sizeof(event)); count = hwdep_read_locked(tscm, buf, count); spin_unlock_irq(&tscm->lock); return count; }

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static unsigned int hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait) { struct snd_tscm *tscm = hwdep->private_data; unsigned int events; poll_wait(file, &tscm->hwdep_wait, wait); spin_lock_irq(&tscm->lock); if (tscm->dev_lock_changed) events = POLLIN | POLLRDNORM; else events = 0; spin_unlock_irq(&tscm->lock); return events; }

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static int hwdep_get_info(struct snd_tscm *tscm, void __user *arg) { struct fw_device *dev = fw_parent_device(tscm->unit); struct snd_firewire_get_info info; memset(&info, 0, sizeof(info)); info.type = SNDRV_FIREWIRE_TYPE_TASCAM; info.card = dev->card->index; *(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]); *(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]); strlcpy(info.device_name, dev_name(&dev->device), sizeof(info.device_name)); if (copy_to_user(arg, &info, sizeof(info))) return -EFAULT; return 0; }

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static int hwdep_lock(struct snd_tscm *tscm) { int err; spin_lock_irq(&tscm->lock); if (tscm->dev_lock_count == 0) { tscm->dev_lock_count = -1; err = 0; } else { err = -EBUSY; } spin_unlock_irq(&tscm->lock); return err; }

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static int hwdep_unlock(struct snd_tscm *tscm) { int err; spin_lock_irq(&tscm->lock); if (tscm->dev_lock_count == -1) { tscm->dev_lock_count = 0; err = 0; } else { err = -EBADFD; } spin_unlock_irq(&tscm->lock); return err; }

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static int hwdep_release(struct snd_hwdep *hwdep, struct file *file) { struct snd_tscm *tscm = hwdep->private_data; spin_lock_irq(&tscm->lock); if (tscm->dev_lock_count == -1) tscm->dev_lock_count = 0; spin_unlock_irq(&tscm->lock); return 0; }

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static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file, unsigned int cmd, unsigned long arg) { struct snd_tscm *tscm = hwdep->private_data; switch (cmd) { case SNDRV_FIREWIRE_IOCTL_GET_INFO: return hwdep_get_info(tscm, (void __user *)arg); case SNDRV_FIREWIRE_IOCTL_LOCK: return hwdep_lock(tscm); case SNDRV_FIREWIRE_IOCTL_UNLOCK: return hwdep_unlock(tscm); default: return -ENOIOCTLCMD; } }

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#ifdef CONFIG_COMPAT
static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file, unsigned int cmd, unsigned long arg) { return hwdep_ioctl(hwdep, file, cmd, (unsigned long)compat_ptr(arg)); }

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#else #define hwdep_compat_ioctl NULL #endif static const struct snd_hwdep_ops hwdep_ops = { .read = hwdep_read, .release = hwdep_release, .poll = hwdep_poll, .ioctl = hwdep_ioctl, .ioctl_compat = hwdep_compat_ioctl, };
int snd_tscm_create_hwdep_device(struct snd_tscm *tscm) { struct snd_hwdep *hwdep; int err; err = snd_hwdep_new(tscm->card, "Tascam", 0, &hwdep); if (err < 0) return err; strcpy(hwdep->name, "Tascam"); hwdep->iface = SNDRV_HWDEP_IFACE_FW_TASCAM; hwdep->ops = hwdep_ops; hwdep->private_data = tscm; hwdep->exclusive = true; return err; }

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