Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 241 insertions, 0 deletions

diff --git a/sound/core/misc.c b/sound/core/misc.c
new file mode 100644
index 000000000..c3f3d94b5
--- /dev/null
+++ b/sound/core/misc.c
@@ -0,0 +1,241 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Misc and compatibility things
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ */
+
+#include <linux/init.h>
+#include <linux/export.h>
+#include <linux/moduleparam.h>
+#include <linux/time.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/fs.h>
+#include <sound/core.h>
+
+#ifdef CONFIG_SND_DEBUG
+
+#ifdef CONFIG_SND_DEBUG_VERBOSE
+#define DEFAULT_DEBUG_LEVEL	2
+#else
+#define DEFAULT_DEBUG_LEVEL	1
+#endif
+
+static int debug = DEFAULT_DEBUG_LEVEL;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Debug level (0 = disable)");
+
+#endif /* CONFIG_SND_DEBUG */
+
+void release_and_free_resource(struct resource *res)
+{
+	if (res) {
+		release_resource(res);
+		kfree(res);
+	}
+}
+EXPORT_SYMBOL(release_and_free_resource);
+
+#ifdef CONFIG_SND_VERBOSE_PRINTK
+/* strip the leading path if the given path is absolute */
+static const char *sanity_file_name(const char *path)
+{
+	if (*path == '/')
+		return strrchr(path, '/') + 1;
+	else
+		return path;
+}
+#endif
+
+#if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
+void __snd_printk(unsigned int level, const char *path, int line,
+		  const char *format, ...)
+{
+	va_list args;
+#ifdef CONFIG_SND_VERBOSE_PRINTK
+	int kern_level;
+	struct va_format vaf;
+	char verbose_fmt[] = KERN_DEFAULT "ALSA %s:%d %pV";
+	bool level_found = false;
+#endif
+
+#ifdef CONFIG_SND_DEBUG
+	if (debug < level)
+		return;
+#endif
+
+	va_start(args, format);
+#ifdef CONFIG_SND_VERBOSE_PRINTK
+	vaf.fmt = format;
+	vaf.va = &args;
+
+	while ((kern_level = printk_get_level(vaf.fmt)) != 0) {
+		const char *end_of_header = printk_skip_level(vaf.fmt);
+
+		/* Ignore KERN_CONT. We print filename:line for each piece. */
+		if (kern_level >= '0' && kern_level <= '7') {
+			memcpy(verbose_fmt, vaf.fmt, end_of_header - vaf.fmt);
+			level_found = true;
+		}
+
+		vaf.fmt = end_of_header;
+	}
+
+	if (!level_found && level)
+		memcpy(verbose_fmt, KERN_DEBUG, sizeof(KERN_DEBUG) - 1);
+
+	printk(verbose_fmt, sanity_file_name(path), line, &vaf);
+#else
+	vprintk(format, args);
+#endif
+	va_end(args);
+}
+EXPORT_SYMBOL_GPL(__snd_printk);
+#endif
+
+#ifdef CONFIG_PCI
+#include <linux/pci.h>
+/**
+ * snd_pci_quirk_lookup_id - look up a PCI SSID quirk list
+ * @vendor: PCI SSV id
+ * @device: PCI SSD id
+ * @list: quirk list, terminated by a null entry
+ *
+ * Look through the given quirk list and finds a matching entry
+ * with the same PCI SSID.  When subdevice is 0, all subdevice
+ * values may match.
+ *
+ * Returns the matched entry pointer, or NULL if nothing matched.
+ */
+const struct snd_pci_quirk *
+snd_pci_quirk_lookup_id(u16 vendor, u16 device,
+			const struct snd_pci_quirk *list)
+{
+	const struct snd_pci_quirk *q;
+
+	for (q = list; q->subvendor; q++) {
+		if (q->subvendor != vendor)
+			continue;
+		if (!q->subdevice ||
+		    (device & q->subdevice_mask) == q->subdevice)
+			return q;
+	}
+	return NULL;
+}
+EXPORT_SYMBOL(snd_pci_quirk_lookup_id);
+
+/**
+ * snd_pci_quirk_lookup - look up a PCI SSID quirk list
+ * @pci: pci_dev handle
+ * @list: quirk list, terminated by a null entry
+ *
+ * Look through the given quirk list and finds a matching entry
+ * with the same PCI SSID.  When subdevice is 0, all subdevice
+ * values may match.
+ *
+ * Returns the matched entry pointer, or NULL if nothing matched.
+ */
+const struct snd_pci_quirk *
+snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
+{
+	if (!pci)
+		return NULL;
+	return snd_pci_quirk_lookup_id(pci->subsystem_vendor,
+				       pci->subsystem_device,
+				       list);
+}
+EXPORT_SYMBOL(snd_pci_quirk_lookup);
+#endif
+
+/*
+ * Deferred async signal helpers
+ *
+ * Below are a few helper functions to wrap the async signal handling
+ * in the deferred work.  The main purpose is to avoid the messy deadlock
+ * around tasklist_lock and co at the kill_fasync() invocation.
+ * fasync_helper() and kill_fasync() are replaced with snd_fasync_helper()
+ * and snd_kill_fasync(), respectively.  In addition, snd_fasync_free() has
+ * to be called at releasing the relevant file object.
+ */
+struct snd_fasync {
+	struct fasync_struct *fasync;
+	int signal;
+	int poll;
+	int on;
+	struct list_head list;
+};
+
+static DEFINE_SPINLOCK(snd_fasync_lock);
+static LIST_HEAD(snd_fasync_list);
+
+static void snd_fasync_work_fn(struct work_struct *work)
+{
+	struct snd_fasync *fasync;
+
+	spin_lock_irq(&snd_fasync_lock);
+	while (!list_empty(&snd_fasync_list)) {
+		fasync = list_first_entry(&snd_fasync_list, struct snd_fasync, list);
+		list_del_init(&fasync->list);
+		spin_unlock_irq(&snd_fasync_lock);
+		if (fasync->on)
+			kill_fasync(&fasync->fasync, fasync->signal, fasync->poll);
+		spin_lock_irq(&snd_fasync_lock);
+	}
+	spin_unlock_irq(&snd_fasync_lock);
+}
+
+static DECLARE_WORK(snd_fasync_work, snd_fasync_work_fn);
+
+int snd_fasync_helper(int fd, struct file *file, int on,
+		      struct snd_fasync **fasyncp)
+{
+	struct snd_fasync *fasync = NULL;
+
+	if (on) {
+		fasync = kzalloc(sizeof(*fasync), GFP_KERNEL);
+		if (!fasync)
+			return -ENOMEM;
+		INIT_LIST_HEAD(&fasync->list);
+	}
+
+	spin_lock_irq(&snd_fasync_lock);
+	if (*fasyncp) {
+		kfree(fasync);
+		fasync = *fasyncp;
+	} else {
+		if (!fasync) {
+			spin_unlock_irq(&snd_fasync_lock);
+			return 0;
+		}
+		*fasyncp = fasync;
+	}
+	fasync->on = on;
+	spin_unlock_irq(&snd_fasync_lock);
+	return fasync_helper(fd, file, on, &fasync->fasync);
+}
+EXPORT_SYMBOL_GPL(snd_fasync_helper);
+
+void snd_kill_fasync(struct snd_fasync *fasync, int signal, int poll)
+{
+	unsigned long flags;
+
+	if (!fasync || !fasync->on)
+		return;
+	spin_lock_irqsave(&snd_fasync_lock, flags);
+	fasync->signal = signal;
+	fasync->poll = poll;
+	list_move(&fasync->list, &snd_fasync_list);
+	schedule_work(&snd_fasync_work);
+	spin_unlock_irqrestore(&snd_fasync_lock, flags);
+}
+EXPORT_SYMBOL_GPL(snd_kill_fasync);
+
+void snd_fasync_free(struct snd_fasync *fasync)
+{
+	if (!fasync)
+		return;
+	fasync->on = 0;
+	flush_work(&snd_fasync_work);
+	kfree(fasync);
+}
+EXPORT_SYMBOL_GPL(snd_fasync_free);