LXR linux/sound/core/misc.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Misc and compatibility things
   4 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   5 */
   6
   7#include <linux/init.h>
   8#include <linux/export.h>
   9#include <linux/moduleparam.h>
  10#include <linux/time.h>
  11#include <linux/slab.h>
  12#include <linux/ioport.h>
  13#include <sound/core.h>
  14
  15#ifdef CONFIG_SND_DEBUG
  16
  17#ifdef CONFIG_SND_DEBUG_VERBOSE
  18#define DEFAULT_DEBUG_LEVEL     2
  19#else
  20#define DEFAULT_DEBUG_LEVEL     1
  21#endif
  22
  23static int debug = DEFAULT_DEBUG_LEVEL;
  24module_param(debug, int, 0644);
  25MODULE_PARM_DESC(debug, "Debug level (0 = disable)");
  26
  27#endif /* CONFIG_SND_DEBUG */
  28
  29void release_and_free_resource(struct resource *res)
  30{
  31        if (res) {
  32                release_resource(res);
  33                kfree(res);
  34        }
  35}
  36EXPORT_SYMBOL(release_and_free_resource);
  37
  38#ifdef CONFIG_SND_VERBOSE_PRINTK
  39/* strip the leading path if the given path is absolute */
  40static const char *sanity_file_name(const char *path)
  41{
  42        if (*path == '/')
  43                return strrchr(path, '/') + 1;
  44        else
  45                return path;
  46}
  47#endif
  48
  49#if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
  50void __snd_printk(unsigned int level, const char *path, int line,
  51                  const char *format, ...)
  52{
  53        va_list args;
  54#ifdef CONFIG_SND_VERBOSE_PRINTK
  55        int kern_level;
  56        struct va_format vaf;
  57        char verbose_fmt[] = KERN_DEFAULT "ALSA %s:%d %pV";
  58        bool level_found = false;
  59#endif
  60
  61#ifdef CONFIG_SND_DEBUG
  62        if (debug < level)
  63                return;
  64#endif
  65
  66        va_start(args, format);
  67#ifdef CONFIG_SND_VERBOSE_PRINTK
  68        vaf.fmt = format;
  69        vaf.va = &args;
  70
  71        while ((kern_level = printk_get_level(vaf.fmt)) != 0) {
  72                const char *end_of_header = printk_skip_level(vaf.fmt);
  73
  74                /* Ignore KERN_CONT. We print filename:line for each piece. */
  75                if (kern_level >= '0' && kern_level <= '7') {
  76                        memcpy(verbose_fmt, vaf.fmt, end_of_header - vaf.fmt);
  77                        level_found = true;
  78                }
  79
  80                vaf.fmt = end_of_header;
  81        }
  82
  83        if (!level_found && level)
  84                memcpy(verbose_fmt, KERN_DEBUG, sizeof(KERN_DEBUG) - 1);
  85
  86        printk(verbose_fmt, sanity_file_name(path), line, &vaf);
  87#else
  88        vprintk(format, args);
  89#endif
  90        va_end(args);
  91}
  92EXPORT_SYMBOL_GPL(__snd_printk);
  93#endif
  94
  95#ifdef CONFIG_PCI
  96#include <linux/pci.h>
  97/**
  98 * snd_pci_quirk_lookup_id - look up a PCI SSID quirk list
  99 * @vendor: PCI SSV id
 100 * @device: PCI SSD id
 101 * @list: quirk list, terminated by a null entry
 102 *
 103 * Look through the given quirk list and finds a matching entry
 104 * with the same PCI SSID.  When subdevice is 0, all subdevice
 105 * values may match.
 106 *
 107 * Returns the matched entry pointer, or NULL if nothing matched.
 108 */
 109const struct snd_pci_quirk *
 110snd_pci_quirk_lookup_id(u16 vendor, u16 device,
 111                        const struct snd_pci_quirk *list)
 112{
 113        const struct snd_pci_quirk *q;
 114
 115        for (q = list; q->subvendor; q++) {
 116                if (q->subvendor != vendor)
 117                        continue;
 118                if (!q->subdevice ||
 119                    (device & q->subdevice_mask) == q->subdevice)
 120                        return q;
 121        }
 122        return NULL;
 123}
 124EXPORT_SYMBOL(snd_pci_quirk_lookup_id);
 125
 126/**
 127 * snd_pci_quirk_lookup - look up a PCI SSID quirk list
 128 * @pci: pci_dev handle
 129 * @list: quirk list, terminated by a null entry
 130 *
 131 * Look through the given quirk list and finds a matching entry
 132 * with the same PCI SSID.  When subdevice is 0, all subdevice
 133 * values may match.
 134 *
 135 * Returns the matched entry pointer, or NULL if nothing matched.
 136 */
 137const struct snd_pci_quirk *
 138snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
 139{
 140        if (!pci)
 141                return NULL;
 142        return snd_pci_quirk_lookup_id(pci->subsystem_vendor,
 143                                       pci->subsystem_device,
 144                                       list);
 145}
 146EXPORT_SYMBOL(snd_pci_quirk_lookup);
 147#endif
 148