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 EXPORT_SYMBOL(release_and_free_resource);
  52
  53 #ifdef CONFIG_SND_VERBOSE_PRINTK
  54 /* strip the leading path if the given path is absolute */
  55 static const char *sanity_file_name(const char *path)
  56 {
  57         if (*path == '/')
  58                 return strrchr(path, '/') + 1;
  59         else
  60                 return path;
  61 }
  62 #endif
  63
  64 #if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
  65 void __snd_printk(unsigned int level, const char *path, int line,
  66                   const char *format, ...)
  67 {
  68         va_list args;
  69 #ifdef CONFIG_SND_VERBOSE_PRINTK
  70         int kern_level;
  71         struct va_format vaf;
  72         char verbose_fmt[] = KERN_DEFAULT "ALSA %s:%d %pV";
  73         bool level_found = false;
  74 #endif
  75
  76 #ifdef CONFIG_SND_DEBUG
  77         if (debug < level)
  78                 return;
  79 #endif
  80
  81         va_start(args, format);
  82 #ifdef CONFIG_SND_VERBOSE_PRINTK
  83         vaf.fmt = format;
  84         vaf.va = &args;
  85
  86         while ((kern_level = printk_get_level(vaf.fmt)) != 0) {
  87                 const char *end_of_header = printk_skip_level(vaf.fmt);
  88
  89                 /* Ignore KERN_CONT. We print filename:line for each piece. */
  90                 if (kern_level >= '0' && kern_level <= '7') {
  91                         memcpy(verbose_fmt, vaf.fmt, end_of_header - vaf.fmt);
  92                         level_found = true;
  93                 }
  94
  95                 vaf.fmt = end_of_header;
  96         }
  97
  98         if (!level_found && level)
  99                 memcpy(verbose_fmt, KERN_DEBUG, sizeof(KERN_DEBUG) - 1);
 100
 101         printk(verbose_fmt, sanity_file_name(path), line, &vaf);
 102 #else
 103         vprintk(format, args);
 104 #endif
 105         va_end(args);
 106 }
 107 EXPORT_SYMBOL_GPL(__snd_printk);
 108 #endif
 109
 110 #ifdef CONFIG_PCI
 111 #include <linux/pci.h>
 112 /**
 113  * snd_pci_quirk_lookup_id - look up a PCI SSID quirk list
 114  * @vendor: PCI SSV id
 115  * @device: PCI SSD id
 116  * @list: quirk list, terminated by a null entry
 117  *
 118  * Look through the given quirk list and finds a matching entry
 119  * with the same PCI SSID.  When subdevice is 0, all subdevice
 120  * values may match.
 121  *
 122  * Returns the matched entry pointer, or NULL if nothing matched.
 123  */
 124 const struct snd_pci_quirk *
 125 snd_pci_quirk_lookup_id(u16 vendor, u16 device,
 126                         const struct snd_pci_quirk *list)
 127 {
 128         const struct snd_pci_quirk *q;
 129
 130         for (q = list; q->subvendor; q++) {
 131                 if (q->subvendor != vendor)
 132                         continue;
 133                 if (!q->subdevice ||
 134                     (device & q->subdevice_mask) == q->subdevice)
 135                         return q;
 136         }
 137         return NULL;
 138 }
 139 EXPORT_SYMBOL(snd_pci_quirk_lookup_id);
 140
 141 /**
 142  * snd_pci_quirk_lookup - look up a PCI SSID quirk list
 143  * @pci: pci_dev handle
 144  * @list: quirk list, terminated by a null entry
 145  *
 146  * Look through the given quirk list and finds a matching entry
 147  * with the same PCI SSID.  When subdevice is 0, all subdevice
 148  * values may match.
 149  *
 150  * Returns the matched entry pointer, or NULL if nothing matched.
 151  */
 152 const struct snd_pci_quirk *
 153 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
 154 {
 155         if (!pci)
 156                 return NULL;
 157         return snd_pci_quirk_lookup_id(pci->subsystem_vendor,
 158                                        pci->subsystem_device,
 159                                        list);
 160 }
 161 EXPORT_SYMBOL(snd_pci_quirk_lookup);
 162 #endif