xref: /openbmc/linux/sound/core/misc.c (revision aac5987a)
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
164