sound/core/misc.c

   1 /*
   2  *  Misc and compatibility things
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/export.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/time.h>
  26 #include <linux/slab.h>
  27 #include <linux/ioport.h>
  28 #include <sound/core.h>
  29
  30 #ifdef CONFIG_SND_DEBUG
  31
  32 #ifdef CONFIG_SND_DEBUG_VERBOSE
  33 #define DEFAULT_DEBUG_LEVEL     2
  34 #else
  35 #define DEFAULT_DEBUG_LEVEL     1
  36 #endif
  37
  38 static int debug = DEFAULT_DEBUG_LEVEL;
  39 module_param(debug, int, 0644);
  40 MODULE_PARM_DESC(debug, "Debug level (0 = disable)");
  41
  42 #endif /* CONFIG_SND_DEBUG */
  43
  44 void release_and_free_resource(struct resource *res)
  45 {
  46         if (res) {
  47                 release_resource(res);
  48                 kfree(res);
  49         }
  50 }
  51
  52 EXPORT_SYMBOL(release_and_free_resource);
  53
  54 #ifdef CONFIG_SND_VERBOSE_PRINTK
  55 /* strip the leading path if the given path is absolute */
  56 static const char *sanity_file_name(const char *path)
  57 {
  58         if (*path == '/')
  59                 return strrchr(path, '/') + 1;
  60         else
  61                 return path;
  62 }
  63 #endif
  64
  65 #if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
  66 void __snd_printk(unsigned int level, const char *path, int line,
  67                   const char *format, ...)
  68 {
  69         va_list args;
  70 #ifdef CONFIG_SND_VERBOSE_PRINTK
  71         int kern_level;
  72         struct va_format vaf;
  73         char verbose_fmt[] = KERN_DEFAULT "ALSA %s:%d %pV";
  74         bool level_found = false;
  75 #endif
  76
  77 #ifdef CONFIG_SND_DEBUG
  78         if (debug < level)
  79                 return;
  80 #endif
  81
  82         va_start(args, format);
  83 #ifdef CONFIG_SND_VERBOSE_PRINTK
  84         vaf.fmt = format;
  85         vaf.va = &args;
  86
  87         while ((kern_level = printk_get_level(vaf.fmt)) != 0) {
  88                 const char *end_of_header = printk_skip_level(vaf.fmt);
  89
  90                 /* Ignore KERN_CONT. We print filename:line for each piece. */
  91                 if (kern_level >= '0' && kern_level <= '7') {
  92                         memcpy(verbose_fmt, vaf.fmt, end_of_header - vaf.fmt);
  93                         level_found = true;
  94                 }
  95
  96                 vaf.fmt = end_of_header;
  97         }
  98
  99         if (!level_found && level)
 100                 memcpy(verbose_fmt, KERN_DEBUG, sizeof(KERN_DEBUG) - 1);
 101
 102         printk(verbose_fmt, sanity_file_name(path), line, &vaf);
 103 #else
 104         vprintk(format, args);
 105 #endif
 106         va_end(args);
 107 }
 108 EXPORT_SYMBOL_GPL(__snd_printk);
 109 #endif
 110
 111 #ifdef CONFIG_PCI
 112 #include <linux/pci.h>
 113 /**
 114  * snd_pci_quirk_lookup_id - look up a PCI SSID quirk list
 115  * @vendor: PCI SSV id
 116  * @device: PCI SSD id
 117  * @list: quirk list, terminated by a null entry
 118  *
 119  * Look through the given quirk list and finds a matching entry
 120  * with the same PCI SSID.  When subdevice is 0, all subdevice
 121  * values may match.
 122  *
 123  * Returns the matched entry pointer, or NULL if nothing matched.
 124  */
 125 const struct snd_pci_quirk *
 126 snd_pci_quirk_lookup_id(u16 vendor, u16 device,
 127                         const struct snd_pci_quirk *list)
 128 {
 129         const struct snd_pci_quirk *q;
 130
 131         for (q = list; q->subvendor; q++) {
 132                 if (q->subvendor != vendor)
 133                         continue;
 134                 if (!q->subdevice ||
 135                     (device & q->subdevice_mask) == q->subdevice)
 136                         return q;
 137         }
 138         return NULL;
 139 }
 140 EXPORT_SYMBOL(snd_pci_quirk_lookup_id);
 141
 142 /**
 143  * snd_pci_quirk_lookup - look up a PCI SSID quirk list
 144  * @pci: pci_dev handle
 145  * @list: quirk list, terminated by a null entry
 146  *
 147  * Look through the given quirk list and finds a matching entry
 148  * with the same PCI SSID.  When subdevice is 0, all subdevice
 149  * values may match.
 150  *
 151  * Returns the matched entry pointer, or NULL if nothing matched.
 152  */
 153 const struct snd_pci_quirk *
 154 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
 155 {
 156         if (!pci)
 157                 return NULL;
 158         return snd_pci_quirk_lookup_id(pci->subsystem_vendor,
 159                                        pci->subsystem_device,
 160                                        list);
 161 }
 162 EXPORT_SYMBOL(snd_pci_quirk_lookup);
 163 #endif