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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
38static int debug = DEFAULT_DEBUG_LEVEL;
39module_param(debug, int, 0644);
40MODULE_PARM_DESC(debug, "Debug level (0 = disable)");
41
42#endif /* CONFIG_SND_DEBUG */
43
44void release_and_free_resource(struct resource *res)
45{
46 if (res) {
47 release_resource(res);
48 kfree(res);
49 }
50}
51
52EXPORT_SYMBOL(release_and_free_resource);
53
54#ifdef CONFIG_SND_VERBOSE_PRINTK
55/* strip the leading path if the given path is absolute */
56static 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)
66void __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#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 kern_level = printk_get_level(format);
87 if (kern_level) {
88 const char *end_of_header = printk_skip_level(format);
89 memcpy(verbose_fmt, format, end_of_header - format);
90 vaf.fmt = end_of_header;
91 } else if (level)
92 memcpy(verbose_fmt, KERN_DEBUG, sizeof(KERN_DEBUG) - 1);
93 printk(verbose_fmt, sanity_file_name(path), line, &vaf);
94
95#else
96 vprintk(format, args);
97#endif
98 va_end(args);
99}
100EXPORT_SYMBOL_GPL(__snd_printk);
101#endif
102
103#ifdef CONFIG_PCI
104#include <linux/pci.h>
105/**
106 * snd_pci_quirk_lookup_id - look up a PCI SSID quirk list
107 * @vendor: PCI SSV id
108 * @device: PCI SSD id
109 * @list: quirk list, terminated by a null entry
110 *
111 * Look through the given quirk list and finds a matching entry
112 * with the same PCI SSID. When subdevice is 0, all subdevice
113 * values may match.
114 *
115 * Returns the matched entry pointer, or NULL if nothing matched.
116 */
117const struct snd_pci_quirk *
118snd_pci_quirk_lookup_id(u16 vendor, u16 device,
119 const struct snd_pci_quirk *list)
120{
121 const struct snd_pci_quirk *q;
122
123 for (q = list; q->subvendor; q++) {
124 if (q->subvendor != vendor)
125 continue;
126 if (!q->subdevice ||
127 (device & q->subdevice_mask) == q->subdevice)
128 return q;
129 }
130 return NULL;
131}
132EXPORT_SYMBOL(snd_pci_quirk_lookup_id);
133
134/**
135 * snd_pci_quirk_lookup - look up a PCI SSID quirk list
136 * @pci: pci_dev handle
137 * @list: quirk list, terminated by a null entry
138 *
139 * Look through the given quirk list and finds a matching entry
140 * with the same PCI SSID. When subdevice is 0, all subdevice
141 * values may match.
142 *
143 * Returns the matched entry pointer, or NULL if nothing matched.
144 */
145const struct snd_pci_quirk *
146snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
147{
148 return snd_pci_quirk_lookup_id(pci->subsystem_vendor,
149 pci->subsystem_device,
150 list);
151}
152EXPORT_SYMBOL(snd_pci_quirk_lookup);
153#endif
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 <linux/fs.h>
14#include <sound/core.h>
15
16#ifdef CONFIG_SND_DEBUG
17
18#ifdef CONFIG_SND_DEBUG_VERBOSE
19#define DEFAULT_DEBUG_LEVEL 2
20#else
21#define DEFAULT_DEBUG_LEVEL 1
22#endif
23
24static int debug = DEFAULT_DEBUG_LEVEL;
25module_param(debug, int, 0644);
26MODULE_PARM_DESC(debug, "Debug level (0 = disable)");
27
28#endif /* CONFIG_SND_DEBUG */
29
30void release_and_free_resource(struct resource *res)
31{
32 if (res) {
33 release_resource(res);
34 kfree(res);
35 }
36}
37EXPORT_SYMBOL(release_and_free_resource);
38
39#ifdef CONFIG_SND_VERBOSE_PRINTK
40/* strip the leading path if the given path is absolute */
41static const char *sanity_file_name(const char *path)
42{
43 if (*path == '/')
44 return strrchr(path, '/') + 1;
45 else
46 return path;
47}
48#endif
49
50#if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
51void __snd_printk(unsigned int level, const char *path, int line,
52 const char *format, ...)
53{
54 va_list args;
55#ifdef CONFIG_SND_VERBOSE_PRINTK
56 int kern_level;
57 struct va_format vaf;
58 char verbose_fmt[] = KERN_DEFAULT "ALSA %s:%d %pV";
59 bool level_found = false;
60#endif
61
62#ifdef CONFIG_SND_DEBUG
63 if (debug < level)
64 return;
65#endif
66
67 va_start(args, format);
68#ifdef CONFIG_SND_VERBOSE_PRINTK
69 vaf.fmt = format;
70 vaf.va = &args;
71
72 while ((kern_level = printk_get_level(vaf.fmt)) != 0) {
73 const char *end_of_header = printk_skip_level(vaf.fmt);
74
75 /* Ignore KERN_CONT. We print filename:line for each piece. */
76 if (kern_level >= '0' && kern_level <= '7') {
77 memcpy(verbose_fmt, vaf.fmt, end_of_header - vaf.fmt);
78 level_found = true;
79 }
80
81 vaf.fmt = end_of_header;
82 }
83
84 if (!level_found && level)
85 memcpy(verbose_fmt, KERN_DEBUG, sizeof(KERN_DEBUG) - 1);
86
87 printk(verbose_fmt, sanity_file_name(path), line, &vaf);
88#else
89 vprintk(format, args);
90#endif
91 va_end(args);
92}
93EXPORT_SYMBOL_GPL(__snd_printk);
94#endif
95
96#ifdef CONFIG_PCI
97#include <linux/pci.h>
98/**
99 * snd_pci_quirk_lookup_id - look up a PCI SSID quirk list
100 * @vendor: PCI SSV id
101 * @device: PCI SSD id
102 * @list: quirk list, terminated by a null entry
103 *
104 * Look through the given quirk list and finds a matching entry
105 * with the same PCI SSID. When subdevice is 0, all subdevice
106 * values may match.
107 *
108 * Returns the matched entry pointer, or NULL if nothing matched.
109 */
110const struct snd_pci_quirk *
111snd_pci_quirk_lookup_id(u16 vendor, u16 device,
112 const struct snd_pci_quirk *list)
113{
114 const struct snd_pci_quirk *q;
115
116 for (q = list; q->subvendor || q->subdevice; q++) {
117 if (q->subvendor != vendor)
118 continue;
119 if (!q->subdevice ||
120 (device & q->subdevice_mask) == q->subdevice)
121 return q;
122 }
123 return NULL;
124}
125EXPORT_SYMBOL(snd_pci_quirk_lookup_id);
126
127/**
128 * snd_pci_quirk_lookup - look up a PCI SSID quirk list
129 * @pci: pci_dev handle
130 * @list: quirk list, terminated by a null entry
131 *
132 * Look through the given quirk list and finds a matching entry
133 * with the same PCI SSID. When subdevice is 0, all subdevice
134 * values may match.
135 *
136 * Returns the matched entry pointer, or NULL if nothing matched.
137 */
138const struct snd_pci_quirk *
139snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
140{
141 if (!pci)
142 return NULL;
143 return snd_pci_quirk_lookup_id(pci->subsystem_vendor,
144 pci->subsystem_device,
145 list);
146}
147EXPORT_SYMBOL(snd_pci_quirk_lookup);
148#endif
149
150/*
151 * Deferred async signal helpers
152 *
153 * Below are a few helper functions to wrap the async signal handling
154 * in the deferred work. The main purpose is to avoid the messy deadlock
155 * around tasklist_lock and co at the kill_fasync() invocation.
156 * fasync_helper() and kill_fasync() are replaced with snd_fasync_helper()
157 * and snd_kill_fasync(), respectively. In addition, snd_fasync_free() has
158 * to be called at releasing the relevant file object.
159 */
160struct snd_fasync {
161 struct fasync_struct *fasync;
162 int signal;
163 int poll;
164 int on;
165 struct list_head list;
166};
167
168static DEFINE_SPINLOCK(snd_fasync_lock);
169static LIST_HEAD(snd_fasync_list);
170
171static void snd_fasync_work_fn(struct work_struct *work)
172{
173 struct snd_fasync *fasync;
174
175 spin_lock_irq(&snd_fasync_lock);
176 while (!list_empty(&snd_fasync_list)) {
177 fasync = list_first_entry(&snd_fasync_list, struct snd_fasync, list);
178 list_del_init(&fasync->list);
179 spin_unlock_irq(&snd_fasync_lock);
180 if (fasync->on)
181 kill_fasync(&fasync->fasync, fasync->signal, fasync->poll);
182 spin_lock_irq(&snd_fasync_lock);
183 }
184 spin_unlock_irq(&snd_fasync_lock);
185}
186
187static DECLARE_WORK(snd_fasync_work, snd_fasync_work_fn);
188
189int snd_fasync_helper(int fd, struct file *file, int on,
190 struct snd_fasync **fasyncp)
191{
192 struct snd_fasync *fasync = NULL;
193
194 if (on) {
195 fasync = kzalloc(sizeof(*fasync), GFP_KERNEL);
196 if (!fasync)
197 return -ENOMEM;
198 INIT_LIST_HEAD(&fasync->list);
199 }
200
201 spin_lock_irq(&snd_fasync_lock);
202 if (*fasyncp) {
203 kfree(fasync);
204 fasync = *fasyncp;
205 } else {
206 if (!fasync) {
207 spin_unlock_irq(&snd_fasync_lock);
208 return 0;
209 }
210 *fasyncp = fasync;
211 }
212 fasync->on = on;
213 spin_unlock_irq(&snd_fasync_lock);
214 return fasync_helper(fd, file, on, &fasync->fasync);
215}
216EXPORT_SYMBOL_GPL(snd_fasync_helper);
217
218void snd_kill_fasync(struct snd_fasync *fasync, int signal, int poll)
219{
220 unsigned long flags;
221
222 if (!fasync || !fasync->on)
223 return;
224 spin_lock_irqsave(&snd_fasync_lock, flags);
225 fasync->signal = signal;
226 fasync->poll = poll;
227 list_move(&fasync->list, &snd_fasync_list);
228 schedule_work(&snd_fasync_work);
229 spin_unlock_irqrestore(&snd_fasync_lock, flags);
230}
231EXPORT_SYMBOL_GPL(snd_kill_fasync);
232
233void snd_fasync_free(struct snd_fasync *fasync)
234{
235 if (!fasync)
236 return;
237 fasync->on = 0;
238 flush_work(&snd_fasync_work);
239 kfree(fasync);
240}
241EXPORT_SYMBOL_GPL(snd_fasync_free);