1 files changed, 543 insertions, 0 deletions

diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
new file mode 100644
index 000000000..0c0298928
--- /dev/null
+++ b/sound/core/hwdep.c
@@ -0,0 +1,543 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Hardware dependent layer
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ */
+
+#include <linux/major.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/sched/signal.h>
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/minors.h>
+#include <sound/hwdep.h>
+#include <sound/info.h>
+
+MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
+MODULE_DESCRIPTION("Hardware dependent layer");
+MODULE_LICENSE("GPL");
+
+static LIST_HEAD(snd_hwdep_devices);
+static DEFINE_MUTEX(register_mutex);
+
+static int snd_hwdep_dev_free(struct snd_device *device);
+static int snd_hwdep_dev_register(struct snd_device *device);
+static int snd_hwdep_dev_disconnect(struct snd_device *device);
+
+
+static struct snd_hwdep *snd_hwdep_search(struct snd_card *card, int device)
+{
+	struct snd_hwdep *hwdep;
+
+	list_for_each_entry(hwdep, &snd_hwdep_devices, list)
+		if (hwdep->card == card && hwdep->device == device)
+			return hwdep;
+	return NULL;
+}
+
+static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
+{
+	struct snd_hwdep *hw = file->private_data;
+	if (hw->ops.llseek)
+		return hw->ops.llseek(hw, file, offset, orig);
+	return -ENXIO;
+}
+
+static ssize_t snd_hwdep_read(struct file * file, char __user *buf,
+			      size_t count, loff_t *offset)
+{
+	struct snd_hwdep *hw = file->private_data;
+	if (hw->ops.read)
+		return hw->ops.read(hw, buf, count, offset);
+	return -ENXIO;	
+}
+
+static ssize_t snd_hwdep_write(struct file * file, const char __user *buf,
+			       size_t count, loff_t *offset)
+{
+	struct snd_hwdep *hw = file->private_data;
+	if (hw->ops.write)
+		return hw->ops.write(hw, buf, count, offset);
+	return -ENXIO;	
+}
+
+static int snd_hwdep_open(struct inode *inode, struct file * file)
+{
+	int major = imajor(inode);
+	struct snd_hwdep *hw;
+	int err;
+	wait_queue_entry_t wait;
+
+	if (major == snd_major) {
+		hw = snd_lookup_minor_data(iminor(inode),
+					   SNDRV_DEVICE_TYPE_HWDEP);
+#ifdef CONFIG_SND_OSSEMUL
+	} else if (major == SOUND_MAJOR) {
+		hw = snd_lookup_oss_minor_data(iminor(inode),
+					       SNDRV_OSS_DEVICE_TYPE_DMFM);
+#endif
+	} else
+		return -ENXIO;
+	if (hw == NULL)
+		return -ENODEV;
+
+	if (!try_module_get(hw->card->module)) {
+		snd_card_unref(hw->card);
+		return -EFAULT;
+	}
+
+	init_waitqueue_entry(&wait, current);
+	add_wait_queue(&hw->open_wait, &wait);
+	mutex_lock(&hw->open_mutex);
+	while (1) {
+		if (hw->exclusive && hw->used > 0) {
+			err = -EBUSY;
+			break;
+		}
+		if (!hw->ops.open) {
+			err = 0;
+			break;
+		}
+		err = hw->ops.open(hw, 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(&hw->open_mutex);
+		schedule();
+		mutex_lock(&hw->open_mutex);
+		if (hw->card->shutdown) {
+			err = -ENODEV;
+			break;
+		}
+		if (signal_pending(current)) {
+			err = -ERESTARTSYS;
+			break;
+		}
+	}
+	remove_wait_queue(&hw->open_wait, &wait);
+	if (err >= 0) {
+		err = snd_card_file_add(hw->card, file);
+		if (err >= 0) {
+			file->private_data = hw;
+			hw->used++;
+		} else {
+			if (hw->ops.release)
+				hw->ops.release(hw, file);
+		}
+	}
+	mutex_unlock(&hw->open_mutex);
+	if (err < 0)
+		module_put(hw->card->module);
+	snd_card_unref(hw->card);
+	return err;
+}
+
+static int snd_hwdep_release(struct inode *inode, struct file * file)
+{
+	int err = 0;
+	struct snd_hwdep *hw = file->private_data;
+	struct module *mod = hw->card->module;
+
+	mutex_lock(&hw->open_mutex);
+	if (hw->ops.release)
+		err = hw->ops.release(hw, file);
+	if (hw->used > 0)
+		hw->used--;
+	mutex_unlock(&hw->open_mutex);
+	wake_up(&hw->open_wait);
+
+	snd_card_file_remove(hw->card, file);
+	module_put(mod);
+	return err;
+}
+
+static __poll_t snd_hwdep_poll(struct file * file, poll_table * wait)
+{
+	struct snd_hwdep *hw = file->private_data;
+	if (hw->ops.poll)
+		return hw->ops.poll(hw, file, wait);
+	return 0;
+}
+
+static int snd_hwdep_info(struct snd_hwdep *hw,
+			  struct snd_hwdep_info __user *_info)
+{
+	struct snd_hwdep_info info;
+	
+	memset(&info, 0, sizeof(info));
+	info.card = hw->card->number;
+	strlcpy(info.id, hw->id, sizeof(info.id));	
+	strlcpy(info.name, hw->name, sizeof(info.name));
+	info.iface = hw->iface;
+	if (copy_to_user(_info, &info, sizeof(info)))
+		return -EFAULT;
+	return 0;
+}
+
+static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
+				struct snd_hwdep_dsp_status __user *_info)
+{
+	struct snd_hwdep_dsp_status info;
+	int err;
+	
+	if (! hw->ops.dsp_status)
+		return -ENXIO;
+	memset(&info, 0, sizeof(info));
+	info.dsp_loaded = hw->dsp_loaded;
+	if ((err = hw->ops.dsp_status(hw, &info)) < 0)
+		return err;
+	if (copy_to_user(_info, &info, sizeof(info)))
+		return -EFAULT;
+	return 0;
+}
+
+static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
+			      struct snd_hwdep_dsp_image *info)
+{
+	int err;
+	
+	if (! hw->ops.dsp_load)
+		return -ENXIO;
+	if (info->index >= 32)
+		return -EINVAL;
+	/* check whether the dsp was already loaded */
+	if (hw->dsp_loaded & (1u << info->index))
+		return -EBUSY;
+	err = hw->ops.dsp_load(hw, info);
+	if (err < 0)
+		return err;
+	hw->dsp_loaded |= (1u << info->index);
+	return 0;
+}
+
+static int snd_hwdep_dsp_load_user(struct snd_hwdep *hw,
+				   struct snd_hwdep_dsp_image __user *_info)
+{
+	struct snd_hwdep_dsp_image info = {};
+
+	if (copy_from_user(&info, _info, sizeof(info)))
+		return -EFAULT;
+	return snd_hwdep_dsp_load(hw, &info);
+}
+
+
+static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
+			    unsigned long arg)
+{
+	struct snd_hwdep *hw = file->private_data;
+	void __user *argp = (void __user *)arg;
+	switch (cmd) {
+	case SNDRV_HWDEP_IOCTL_PVERSION:
+		return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
+	case SNDRV_HWDEP_IOCTL_INFO:
+		return snd_hwdep_info(hw, argp);
+	case SNDRV_HWDEP_IOCTL_DSP_STATUS:
+		return snd_hwdep_dsp_status(hw, argp);
+	case SNDRV_HWDEP_IOCTL_DSP_LOAD:
+		return snd_hwdep_dsp_load_user(hw, argp);
+	}
+	if (hw->ops.ioctl)
+		return hw->ops.ioctl(hw, file, cmd, arg);
+	return -ENOTTY;
+}
+
+static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
+{
+	struct snd_hwdep *hw = file->private_data;
+	if (hw->ops.mmap)
+		return hw->ops.mmap(hw, file, vma);
+	return -ENXIO;
+}
+
+static int snd_hwdep_control_ioctl(struct snd_card *card,
+				   struct snd_ctl_file * control,
+				   unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
+		{
+			int device;
+
+			if (get_user(device, (int __user *)arg))
+				return -EFAULT;
+			mutex_lock(&register_mutex);
+
+			if (device < 0)
+				device = 0;
+			else if (device < SNDRV_MINOR_HWDEPS)
+				device++;
+			else
+				device = SNDRV_MINOR_HWDEPS;
+
+			while (device < SNDRV_MINOR_HWDEPS) {
+				if (snd_hwdep_search(card, device))
+					break;
+				device++;
+			}
+			if (device >= SNDRV_MINOR_HWDEPS)
+				device = -1;
+			mutex_unlock(&register_mutex);
+			if (put_user(device, (int __user *)arg))
+				return -EFAULT;
+			return 0;
+		}
+	case SNDRV_CTL_IOCTL_HWDEP_INFO:
+		{
+			struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
+			int device, err;
+			struct snd_hwdep *hwdep;
+
+			if (get_user(device, &info->device))
+				return -EFAULT;
+			mutex_lock(&register_mutex);
+			hwdep = snd_hwdep_search(card, device);
+			if (hwdep)
+				err = snd_hwdep_info(hwdep, info);
+			else
+				err = -ENXIO;
+			mutex_unlock(&register_mutex);
+			return err;
+		}
+	}
+	return -ENOIOCTLCMD;
+}
+
+#ifdef CONFIG_COMPAT
+#include "hwdep_compat.c"
+#else
+#define snd_hwdep_ioctl_compat	NULL
+#endif
+
+/*
+
+ */
+
+static const struct file_operations snd_hwdep_f_ops =
+{
+	.owner = 	THIS_MODULE,
+	.llseek =	snd_hwdep_llseek,
+	.read = 	snd_hwdep_read,
+	.write =	snd_hwdep_write,
+	.open =		snd_hwdep_open,
+	.release =	snd_hwdep_release,
+	.poll =		snd_hwdep_poll,
+	.unlocked_ioctl =	snd_hwdep_ioctl,
+	.compat_ioctl =	snd_hwdep_ioctl_compat,
+	.mmap =		snd_hwdep_mmap,
+};
+
+static void release_hwdep_device(struct device *dev)
+{
+	kfree(container_of(dev, struct snd_hwdep, dev));
+}
+
+/**
+ * snd_hwdep_new - create a new hwdep instance
+ * @card: the card instance
+ * @id: the id string
+ * @device: the device index (zero-based)
+ * @rhwdep: the pointer to store the new hwdep instance
+ *
+ * Creates a new hwdep instance with the given index on the card.
+ * The callbacks (hwdep->ops) must be set on the returned instance
+ * after this call manually by the caller.
+ *
+ * Return: Zero if successful, or a negative error code on failure.
+ */
+int snd_hwdep_new(struct snd_card *card, char *id, int device,
+		  struct snd_hwdep **rhwdep)
+{
+	struct snd_hwdep *hwdep;
+	int err;
+	static const struct snd_device_ops ops = {
+		.dev_free = snd_hwdep_dev_free,
+		.dev_register = snd_hwdep_dev_register,
+		.dev_disconnect = snd_hwdep_dev_disconnect,
+	};
+
+	if (snd_BUG_ON(!card))
+		return -ENXIO;
+	if (rhwdep)
+		*rhwdep = NULL;
+	hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
+	if (!hwdep)
+		return -ENOMEM;
+
+	init_waitqueue_head(&hwdep->open_wait);
+	mutex_init(&hwdep->open_mutex);
+	hwdep->card = card;
+	hwdep->device = device;
+	if (id)
+		strlcpy(hwdep->id, id, sizeof(hwdep->id));
+
+	snd_device_initialize(&hwdep->dev, card);
+	hwdep->dev.release = release_hwdep_device;
+	dev_set_name(&hwdep->dev, "hwC%iD%i", card->number, device);
+#ifdef CONFIG_SND_OSSEMUL
+	hwdep->oss_type = -1;
+#endif
+
+	err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops);
+	if (err < 0) {
+		put_device(&hwdep->dev);
+		return err;
+	}
+
+	if (rhwdep)
+		*rhwdep = hwdep;
+	return 0;
+}
+EXPORT_SYMBOL(snd_hwdep_new);
+
+static int snd_hwdep_dev_free(struct snd_device *device)
+{
+	struct snd_hwdep *hwdep = device->device_data;
+	if (!hwdep)
+		return 0;
+	if (hwdep->private_free)
+		hwdep->private_free(hwdep);
+	put_device(&hwdep->dev);
+	return 0;
+}
+
+static int snd_hwdep_dev_register(struct snd_device *device)
+{
+	struct snd_hwdep *hwdep = device->device_data;
+	struct snd_card *card = hwdep->card;
+	int err;
+
+	mutex_lock(&register_mutex);
+	if (snd_hwdep_search(card, hwdep->device)) {
+		mutex_unlock(&register_mutex);
+		return -EBUSY;
+	}
+	list_add_tail(&hwdep->list, &snd_hwdep_devices);
+	err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
+				  hwdep->card, hwdep->device,
+				  &snd_hwdep_f_ops, hwdep, &hwdep->dev);
+	if (err < 0) {
+		dev_err(&hwdep->dev, "unable to register\n");
+		list_del(&hwdep->list);
+		mutex_unlock(&register_mutex);
+		return err;
+	}
+
+#ifdef CONFIG_SND_OSSEMUL
+	hwdep->ossreg = 0;
+	if (hwdep->oss_type >= 0) {
+		if (hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM &&
+		    hwdep->device)
+			dev_warn(&hwdep->dev,
+				 "only hwdep device 0 can be registered as OSS direct FM device!\n");
+		else if (snd_register_oss_device(hwdep->oss_type,
+						 card, hwdep->device,
+						 &snd_hwdep_f_ops, hwdep) < 0)
+			dev_warn(&hwdep->dev,
+				 "unable to register OSS compatibility device\n");
+		else
+			hwdep->ossreg = 1;
+	}
+#endif
+	mutex_unlock(&register_mutex);
+	return 0;
+}
+
+static int snd_hwdep_dev_disconnect(struct snd_device *device)
+{
+	struct snd_hwdep *hwdep = device->device_data;
+
+	if (snd_BUG_ON(!hwdep))
+		return -ENXIO;
+	mutex_lock(&register_mutex);
+	if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
+		mutex_unlock(&register_mutex);
+		return -EINVAL;
+	}
+	mutex_lock(&hwdep->open_mutex);
+	wake_up(&hwdep->open_wait);
+#ifdef CONFIG_SND_OSSEMUL
+	if (hwdep->ossreg)
+		snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
+#endif
+	snd_unregister_device(&hwdep->dev);
+	list_del_init(&hwdep->list);
+	mutex_unlock(&hwdep->open_mutex);
+	mutex_unlock(&register_mutex);
+	return 0;
+}
+
+#ifdef CONFIG_SND_PROC_FS
+/*
+ *  Info interface
+ */
+
+static void snd_hwdep_proc_read(struct snd_info_entry *entry,
+				struct snd_info_buffer *buffer)
+{
+	struct snd_hwdep *hwdep;
+
+	mutex_lock(&register_mutex);
+	list_for_each_entry(hwdep, &snd_hwdep_devices, list)
+		snd_iprintf(buffer, "%02i-%02i: %s\n",
+			    hwdep->card->number, hwdep->device, hwdep->name);
+	mutex_unlock(&register_mutex);
+}
+
+static struct snd_info_entry *snd_hwdep_proc_entry;
+
+static void __init snd_hwdep_proc_init(void)
+{
+	struct snd_info_entry *entry;
+
+	if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
+		entry->c.text.read = snd_hwdep_proc_read;
+		if (snd_info_register(entry) < 0) {
+			snd_info_free_entry(entry);
+			entry = NULL;
+		}
+	}
+	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)