diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /sound/core/misc.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sound/core/misc.c')
-rw-r--r-- | sound/core/misc.c | 241 |
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..d32a19976 --- /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->subdevice; 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); |