2019-05-29 23:57:59 +00:00
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// SPDX-License-Identifier: GPL-2.0-only
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2017-03-22 12:30:24 +00:00
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/*
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* motu-hwdep.c - a part of driver for MOTU FireWire series
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*
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* Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
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*/
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/*
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* This codes have five functionalities.
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*
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* 1.get information about firewire node
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* 2.get notification about starting/stopping stream
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* 3.lock/unlock streaming
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*
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*/
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#include "motu.h"
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static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
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loff_t *offset)
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{
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struct snd_motu *motu = hwdep->private_data;
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DEFINE_WAIT(wait);
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union snd_firewire_event event;
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spin_lock_irq(&motu->lock);
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2017-03-22 12:30:25 +00:00
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while (!motu->dev_lock_changed && motu->msg == 0) {
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2017-03-22 12:30:24 +00:00
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prepare_to_wait(&motu->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
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spin_unlock_irq(&motu->lock);
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schedule();
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finish_wait(&motu->hwdep_wait, &wait);
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if (signal_pending(current))
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return -ERESTARTSYS;
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spin_lock_irq(&motu->lock);
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}
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memset(&event, 0, sizeof(event));
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if (motu->dev_lock_changed) {
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event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
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event.lock_status.status = (motu->dev_lock_count > 0);
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motu->dev_lock_changed = false;
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count = min_t(long, count, sizeof(event.lock_status));
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2017-03-22 12:30:25 +00:00
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} else {
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event.motu_notification.type = SNDRV_FIREWIRE_EVENT_MOTU_NOTIFICATION;
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event.motu_notification.message = motu->msg;
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motu->msg = 0;
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count = min_t(long, count, sizeof(event.motu_notification));
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2017-03-22 12:30:24 +00:00
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}
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spin_unlock_irq(&motu->lock);
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if (copy_to_user(buf, &event, count))
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return -EFAULT;
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return count;
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}
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2017-07-03 03:27:36 +00:00
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static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
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2017-03-22 12:30:24 +00:00
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poll_table *wait)
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{
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struct snd_motu *motu = hwdep->private_data;
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2017-07-03 03:27:36 +00:00
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__poll_t events;
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2017-03-22 12:30:24 +00:00
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poll_wait(file, &motu->hwdep_wait, wait);
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spin_lock_irq(&motu->lock);
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2017-03-22 12:30:25 +00:00
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if (motu->dev_lock_changed || motu->msg)
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2018-02-11 22:34:03 +00:00
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events = EPOLLIN | EPOLLRDNORM;
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2017-03-22 12:30:24 +00:00
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else
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events = 0;
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spin_unlock_irq(&motu->lock);
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2018-02-11 22:34:03 +00:00
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return events | EPOLLOUT;
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2017-03-22 12:30:24 +00:00
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}
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static int hwdep_get_info(struct snd_motu *motu, void __user *arg)
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{
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struct fw_device *dev = fw_parent_device(motu->unit);
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struct snd_firewire_get_info info;
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memset(&info, 0, sizeof(info));
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info.type = SNDRV_FIREWIRE_TYPE_MOTU;
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info.card = dev->card->index;
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*(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
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*(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
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ALSA: Convert strlcpy to strscpy when return value is unused
strlcpy is deprecated. see: Documentation/process/deprecated.rst
Change the calls that do not use the strlcpy return value to the
preferred strscpy.
Done with cocci script:
@@
expression e1, e2, e3;
@@
- strlcpy(
+ strscpy(
e1, e2, e3);
This cocci script leaves the instances where the return value is
used unchanged.
After this patch, sound/ has 3 uses of strlcpy() that need to be
manually inspected for conversion and changed one day.
$ git grep -w strlcpy sound/
sound/usb/card.c: len = strlcpy(card->longname, s, sizeof(card->longname));
sound/usb/mixer.c: return strlcpy(buf, p->name, buflen);
sound/usb/mixer.c: return strlcpy(buf, p->names[index], buflen);
Miscellenea:
o Remove trailing whitespace in conversion of sound/core/hwdep.c
Link: https://lore.kernel.org/lkml/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/22b393d1790bb268769d0bab7bacf0866dcb0c14.camel@perches.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-01-04 17:17:34 +00:00
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strscpy(info.device_name, dev_name(&dev->device),
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2017-03-22 12:30:24 +00:00
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sizeof(info.device_name));
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if (copy_to_user(arg, &info, sizeof(info)))
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return -EFAULT;
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return 0;
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}
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static int hwdep_lock(struct snd_motu *motu)
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{
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int err;
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spin_lock_irq(&motu->lock);
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if (motu->dev_lock_count == 0) {
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motu->dev_lock_count = -1;
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err = 0;
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} else {
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err = -EBUSY;
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}
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spin_unlock_irq(&motu->lock);
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return err;
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}
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static int hwdep_unlock(struct snd_motu *motu)
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{
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int err;
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spin_lock_irq(&motu->lock);
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if (motu->dev_lock_count == -1) {
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motu->dev_lock_count = 0;
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err = 0;
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} else {
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err = -EBADFD;
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}
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spin_unlock_irq(&motu->lock);
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return err;
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}
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static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
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{
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struct snd_motu *motu = hwdep->private_data;
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spin_lock_irq(&motu->lock);
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if (motu->dev_lock_count == -1)
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motu->dev_lock_count = 0;
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spin_unlock_irq(&motu->lock);
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return 0;
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}
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static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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struct snd_motu *motu = hwdep->private_data;
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switch (cmd) {
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case SNDRV_FIREWIRE_IOCTL_GET_INFO:
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return hwdep_get_info(motu, (void __user *)arg);
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case SNDRV_FIREWIRE_IOCTL_LOCK:
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return hwdep_lock(motu);
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case SNDRV_FIREWIRE_IOCTL_UNLOCK:
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return hwdep_unlock(motu);
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default:
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return -ENOIOCTLCMD;
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}
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}
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#ifdef CONFIG_COMPAT
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static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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return hwdep_ioctl(hwdep, file, cmd,
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(unsigned long)compat_ptr(arg));
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}
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#else
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#define hwdep_compat_ioctl NULL
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#endif
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int snd_motu_create_hwdep_device(struct snd_motu *motu)
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{
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static const struct snd_hwdep_ops ops = {
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.read = hwdep_read,
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.release = hwdep_release,
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.poll = hwdep_poll,
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.ioctl = hwdep_ioctl,
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.ioctl_compat = hwdep_compat_ioctl,
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};
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struct snd_hwdep *hwdep;
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int err;
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err = snd_hwdep_new(motu->card, motu->card->driver, 0, &hwdep);
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if (err < 0)
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return err;
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strcpy(hwdep->name, "MOTU");
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hwdep->iface = SNDRV_HWDEP_IFACE_FW_MOTU;
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hwdep->ops = ops;
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hwdep->private_data = motu;
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hwdep->exclusive = true;
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return 0;
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}
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