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e3ded89966
There are a few places doing assignments in if condition in ALSA core code, which is a bad coding style that may confuse readers and occasionally lead to bugs. This patch is merely for coding-style fixes, no functional changes. Link: https://lore.kernel.org/r/20210608140540.17885-54-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
546 lines
13 KiB
C
546 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware dependent layer
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*/
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#include <linux/major.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/sched/signal.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include <sound/minors.h>
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#include <sound/hwdep.h>
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#include <sound/info.h>
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
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MODULE_DESCRIPTION("Hardware dependent layer");
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MODULE_LICENSE("GPL");
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static LIST_HEAD(snd_hwdep_devices);
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static DEFINE_MUTEX(register_mutex);
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static int snd_hwdep_dev_free(struct snd_device *device);
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static int snd_hwdep_dev_register(struct snd_device *device);
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static int snd_hwdep_dev_disconnect(struct snd_device *device);
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static struct snd_hwdep *snd_hwdep_search(struct snd_card *card, int device)
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{
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struct snd_hwdep *hwdep;
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list_for_each_entry(hwdep, &snd_hwdep_devices, list)
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if (hwdep->card == card && hwdep->device == device)
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return hwdep;
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return NULL;
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}
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static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
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{
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struct snd_hwdep *hw = file->private_data;
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if (hw->ops.llseek)
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return hw->ops.llseek(hw, file, offset, orig);
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return -ENXIO;
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}
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static ssize_t snd_hwdep_read(struct file * file, char __user *buf,
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size_t count, loff_t *offset)
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{
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struct snd_hwdep *hw = file->private_data;
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if (hw->ops.read)
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return hw->ops.read(hw, buf, count, offset);
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return -ENXIO;
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}
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static ssize_t snd_hwdep_write(struct file * file, const char __user *buf,
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size_t count, loff_t *offset)
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{
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struct snd_hwdep *hw = file->private_data;
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if (hw->ops.write)
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return hw->ops.write(hw, buf, count, offset);
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return -ENXIO;
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}
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static int snd_hwdep_open(struct inode *inode, struct file * file)
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{
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int major = imajor(inode);
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struct snd_hwdep *hw;
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int err;
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wait_queue_entry_t wait;
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if (major == snd_major) {
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hw = snd_lookup_minor_data(iminor(inode),
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SNDRV_DEVICE_TYPE_HWDEP);
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#ifdef CONFIG_SND_OSSEMUL
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} else if (major == SOUND_MAJOR) {
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hw = snd_lookup_oss_minor_data(iminor(inode),
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SNDRV_OSS_DEVICE_TYPE_DMFM);
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#endif
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} else
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return -ENXIO;
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if (hw == NULL)
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return -ENODEV;
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if (!try_module_get(hw->card->module)) {
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snd_card_unref(hw->card);
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return -EFAULT;
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}
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init_waitqueue_entry(&wait, current);
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add_wait_queue(&hw->open_wait, &wait);
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mutex_lock(&hw->open_mutex);
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while (1) {
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if (hw->exclusive && hw->used > 0) {
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err = -EBUSY;
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break;
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}
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if (!hw->ops.open) {
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err = 0;
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break;
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}
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err = hw->ops.open(hw, file);
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if (err >= 0)
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break;
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if (err == -EAGAIN) {
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if (file->f_flags & O_NONBLOCK) {
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err = -EBUSY;
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break;
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}
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} else
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break;
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set_current_state(TASK_INTERRUPTIBLE);
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mutex_unlock(&hw->open_mutex);
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schedule();
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mutex_lock(&hw->open_mutex);
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if (hw->card->shutdown) {
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err = -ENODEV;
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break;
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}
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if (signal_pending(current)) {
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err = -ERESTARTSYS;
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break;
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}
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}
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remove_wait_queue(&hw->open_wait, &wait);
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if (err >= 0) {
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err = snd_card_file_add(hw->card, file);
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if (err >= 0) {
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file->private_data = hw;
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hw->used++;
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} else {
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if (hw->ops.release)
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hw->ops.release(hw, file);
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}
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}
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mutex_unlock(&hw->open_mutex);
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if (err < 0)
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module_put(hw->card->module);
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snd_card_unref(hw->card);
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return err;
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}
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static int snd_hwdep_release(struct inode *inode, struct file * file)
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{
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int err = 0;
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struct snd_hwdep *hw = file->private_data;
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struct module *mod = hw->card->module;
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mutex_lock(&hw->open_mutex);
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if (hw->ops.release)
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err = hw->ops.release(hw, file);
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if (hw->used > 0)
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hw->used--;
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mutex_unlock(&hw->open_mutex);
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wake_up(&hw->open_wait);
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snd_card_file_remove(hw->card, file);
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module_put(mod);
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return err;
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}
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static __poll_t snd_hwdep_poll(struct file * file, poll_table * wait)
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{
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struct snd_hwdep *hw = file->private_data;
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if (hw->ops.poll)
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return hw->ops.poll(hw, file, wait);
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return 0;
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}
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static int snd_hwdep_info(struct snd_hwdep *hw,
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struct snd_hwdep_info __user *_info)
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{
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struct snd_hwdep_info info;
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memset(&info, 0, sizeof(info));
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info.card = hw->card->number;
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strscpy(info.id, hw->id, sizeof(info.id));
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strscpy(info.name, hw->name, sizeof(info.name));
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info.iface = hw->iface;
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if (copy_to_user(_info, &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 snd_hwdep_dsp_status(struct snd_hwdep *hw,
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struct snd_hwdep_dsp_status __user *_info)
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{
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struct snd_hwdep_dsp_status info;
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int err;
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if (! hw->ops.dsp_status)
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return -ENXIO;
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memset(&info, 0, sizeof(info));
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info.dsp_loaded = hw->dsp_loaded;
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err = hw->ops.dsp_status(hw, &info);
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if (err < 0)
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return err;
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if (copy_to_user(_info, &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 snd_hwdep_dsp_load(struct snd_hwdep *hw,
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struct snd_hwdep_dsp_image *info)
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{
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int err;
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if (! hw->ops.dsp_load)
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return -ENXIO;
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if (info->index >= 32)
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return -EINVAL;
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/* check whether the dsp was already loaded */
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if (hw->dsp_loaded & (1u << info->index))
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return -EBUSY;
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err = hw->ops.dsp_load(hw, info);
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if (err < 0)
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return err;
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hw->dsp_loaded |= (1u << info->index);
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return 0;
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}
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static int snd_hwdep_dsp_load_user(struct snd_hwdep *hw,
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struct snd_hwdep_dsp_image __user *_info)
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{
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struct snd_hwdep_dsp_image info = {};
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if (copy_from_user(&info, _info, sizeof(info)))
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return -EFAULT;
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return snd_hwdep_dsp_load(hw, &info);
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}
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static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
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unsigned long arg)
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{
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struct snd_hwdep *hw = file->private_data;
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void __user *argp = (void __user *)arg;
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switch (cmd) {
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case SNDRV_HWDEP_IOCTL_PVERSION:
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return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
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case SNDRV_HWDEP_IOCTL_INFO:
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return snd_hwdep_info(hw, argp);
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case SNDRV_HWDEP_IOCTL_DSP_STATUS:
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return snd_hwdep_dsp_status(hw, argp);
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case SNDRV_HWDEP_IOCTL_DSP_LOAD:
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return snd_hwdep_dsp_load_user(hw, argp);
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}
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if (hw->ops.ioctl)
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return hw->ops.ioctl(hw, file, cmd, arg);
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return -ENOTTY;
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}
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static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
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{
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struct snd_hwdep *hw = file->private_data;
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if (hw->ops.mmap)
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return hw->ops.mmap(hw, file, vma);
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return -ENXIO;
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}
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static int snd_hwdep_control_ioctl(struct snd_card *card,
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struct snd_ctl_file * control,
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unsigned int cmd, unsigned long arg)
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{
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switch (cmd) {
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case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
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{
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int device;
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if (get_user(device, (int __user *)arg))
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return -EFAULT;
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mutex_lock(®ister_mutex);
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if (device < 0)
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device = 0;
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else if (device < SNDRV_MINOR_HWDEPS)
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device++;
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else
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device = SNDRV_MINOR_HWDEPS;
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while (device < SNDRV_MINOR_HWDEPS) {
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if (snd_hwdep_search(card, device))
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break;
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device++;
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}
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if (device >= SNDRV_MINOR_HWDEPS)
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device = -1;
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mutex_unlock(®ister_mutex);
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if (put_user(device, (int __user *)arg))
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return -EFAULT;
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return 0;
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}
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case SNDRV_CTL_IOCTL_HWDEP_INFO:
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{
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struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
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int device, err;
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struct snd_hwdep *hwdep;
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if (get_user(device, &info->device))
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return -EFAULT;
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mutex_lock(®ister_mutex);
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hwdep = snd_hwdep_search(card, device);
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if (hwdep)
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err = snd_hwdep_info(hwdep, info);
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else
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err = -ENXIO;
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mutex_unlock(®ister_mutex);
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return err;
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}
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}
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return -ENOIOCTLCMD;
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}
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#ifdef CONFIG_COMPAT
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#include "hwdep_compat.c"
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#else
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#define snd_hwdep_ioctl_compat NULL
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#endif
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/*
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*/
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static const struct file_operations snd_hwdep_f_ops =
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{
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.owner = THIS_MODULE,
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.llseek = snd_hwdep_llseek,
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.read = snd_hwdep_read,
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.write = snd_hwdep_write,
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.open = snd_hwdep_open,
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.release = snd_hwdep_release,
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.poll = snd_hwdep_poll,
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.unlocked_ioctl = snd_hwdep_ioctl,
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.compat_ioctl = snd_hwdep_ioctl_compat,
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.mmap = snd_hwdep_mmap,
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};
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static void release_hwdep_device(struct device *dev)
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{
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kfree(container_of(dev, struct snd_hwdep, dev));
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}
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/**
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* snd_hwdep_new - create a new hwdep instance
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* @card: the card instance
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* @id: the id string
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* @device: the device index (zero-based)
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* @rhwdep: the pointer to store the new hwdep instance
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*
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* Creates a new hwdep instance with the given index on the card.
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* The callbacks (hwdep->ops) must be set on the returned instance
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* after this call manually by the caller.
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*
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* Return: Zero if successful, or a negative error code on failure.
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*/
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int snd_hwdep_new(struct snd_card *card, char *id, int device,
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struct snd_hwdep **rhwdep)
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{
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struct snd_hwdep *hwdep;
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int err;
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static const struct snd_device_ops ops = {
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.dev_free = snd_hwdep_dev_free,
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.dev_register = snd_hwdep_dev_register,
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.dev_disconnect = snd_hwdep_dev_disconnect,
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};
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if (snd_BUG_ON(!card))
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return -ENXIO;
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if (rhwdep)
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*rhwdep = NULL;
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hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
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if (!hwdep)
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return -ENOMEM;
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init_waitqueue_head(&hwdep->open_wait);
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mutex_init(&hwdep->open_mutex);
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hwdep->card = card;
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hwdep->device = device;
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if (id)
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strscpy(hwdep->id, id, sizeof(hwdep->id));
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snd_device_initialize(&hwdep->dev, card);
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hwdep->dev.release = release_hwdep_device;
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dev_set_name(&hwdep->dev, "hwC%iD%i", card->number, device);
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#ifdef CONFIG_SND_OSSEMUL
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hwdep->oss_type = -1;
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#endif
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err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops);
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if (err < 0) {
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put_device(&hwdep->dev);
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return err;
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}
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if (rhwdep)
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*rhwdep = hwdep;
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return 0;
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}
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EXPORT_SYMBOL(snd_hwdep_new);
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static int snd_hwdep_dev_free(struct snd_device *device)
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{
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struct snd_hwdep *hwdep = device->device_data;
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if (!hwdep)
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return 0;
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if (hwdep->private_free)
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hwdep->private_free(hwdep);
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put_device(&hwdep->dev);
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return 0;
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}
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static int snd_hwdep_dev_register(struct snd_device *device)
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{
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struct snd_hwdep *hwdep = device->device_data;
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struct snd_card *card = hwdep->card;
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int err;
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mutex_lock(®ister_mutex);
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if (snd_hwdep_search(card, hwdep->device)) {
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mutex_unlock(®ister_mutex);
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return -EBUSY;
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}
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list_add_tail(&hwdep->list, &snd_hwdep_devices);
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err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
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hwdep->card, hwdep->device,
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&snd_hwdep_f_ops, hwdep, &hwdep->dev);
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if (err < 0) {
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dev_err(&hwdep->dev, "unable to register\n");
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list_del(&hwdep->list);
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mutex_unlock(®ister_mutex);
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return err;
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}
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#ifdef CONFIG_SND_OSSEMUL
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hwdep->ossreg = 0;
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if (hwdep->oss_type >= 0) {
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if (hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM &&
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hwdep->device)
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dev_warn(&hwdep->dev,
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"only hwdep device 0 can be registered as OSS direct FM device!\n");
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else if (snd_register_oss_device(hwdep->oss_type,
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card, hwdep->device,
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&snd_hwdep_f_ops, hwdep) < 0)
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dev_warn(&hwdep->dev,
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"unable to register OSS compatibility device\n");
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else
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hwdep->ossreg = 1;
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}
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#endif
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mutex_unlock(®ister_mutex);
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return 0;
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}
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static int snd_hwdep_dev_disconnect(struct snd_device *device)
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{
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struct snd_hwdep *hwdep = device->device_data;
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if (snd_BUG_ON(!hwdep))
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return -ENXIO;
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mutex_lock(®ister_mutex);
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if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
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mutex_unlock(®ister_mutex);
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return -EINVAL;
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}
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mutex_lock(&hwdep->open_mutex);
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wake_up(&hwdep->open_wait);
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#ifdef CONFIG_SND_OSSEMUL
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if (hwdep->ossreg)
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snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
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#endif
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snd_unregister_device(&hwdep->dev);
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list_del_init(&hwdep->list);
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mutex_unlock(&hwdep->open_mutex);
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mutex_unlock(®ister_mutex);
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return 0;
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}
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#ifdef CONFIG_SND_PROC_FS
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/*
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* Info interface
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*/
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static void snd_hwdep_proc_read(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer)
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{
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struct snd_hwdep *hwdep;
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mutex_lock(®ister_mutex);
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list_for_each_entry(hwdep, &snd_hwdep_devices, list)
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snd_iprintf(buffer, "%02i-%02i: %s\n",
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hwdep->card->number, hwdep->device, hwdep->name);
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mutex_unlock(®ister_mutex);
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}
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static struct snd_info_entry *snd_hwdep_proc_entry;
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static void __init snd_hwdep_proc_init(void)
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{
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struct snd_info_entry *entry;
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entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL);
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if (entry) {
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entry->c.text.read = snd_hwdep_proc_read;
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if (snd_info_register(entry) < 0) {
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snd_info_free_entry(entry);
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entry = NULL;
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}
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}
|
|
snd_hwdep_proc_entry = entry;
|
|
}
|
|
|
|
static void __exit snd_hwdep_proc_done(void)
|
|
{
|
|
snd_info_free_entry(snd_hwdep_proc_entry);
|
|
}
|
|
#else /* !CONFIG_SND_PROC_FS */
|
|
#define snd_hwdep_proc_init()
|
|
#define snd_hwdep_proc_done()
|
|
#endif /* CONFIG_SND_PROC_FS */
|
|
|
|
|
|
/*
|
|
* ENTRY functions
|
|
*/
|
|
|
|
static int __init alsa_hwdep_init(void)
|
|
{
|
|
snd_hwdep_proc_init();
|
|
snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
|
|
snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit alsa_hwdep_exit(void)
|
|
{
|
|
snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
|
|
snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
|
|
snd_hwdep_proc_done();
|
|
}
|
|
|
|
module_init(alsa_hwdep_init)
|
|
module_exit(alsa_hwdep_exit)
|