2 * Misc and compatibility things
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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.
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.
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
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>
29 #include <sound/core.h>
31 #ifdef CONFIG_SND_DEBUG
33 #ifdef CONFIG_SND_DEBUG_VERBOSE
34 #define DEFAULT_DEBUG_LEVEL 2
36 #define DEFAULT_DEBUG_LEVEL 1
39 static int debug = DEFAULT_DEBUG_LEVEL;
40 module_param(debug, int, 0644);
41 MODULE_PARM_DESC(debug, "Debug level (0 = disable)");
43 #endif /* CONFIG_SND_DEBUG */
45 void release_and_free_resource(struct resource *res)
48 release_resource(res);
52 EXPORT_SYMBOL(release_and_free_resource);
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)
59 return strrchr(path, '/') + 1;
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, ...)
70 #ifdef CONFIG_SND_VERBOSE_PRINTK
73 char verbose_fmt[] = KERN_DEFAULT "ALSA %s:%d %pV";
74 bool level_found = false;
77 #ifdef CONFIG_SND_DEBUG
82 va_start(args, format);
83 #ifdef CONFIG_SND_VERBOSE_PRINTK
87 while ((kern_level = printk_get_level(vaf.fmt)) != 0) {
88 const char *end_of_header = printk_skip_level(vaf.fmt);
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);
96 vaf.fmt = end_of_header;
99 if (!level_found && level)
100 memcpy(verbose_fmt, KERN_DEBUG, sizeof(KERN_DEBUG) - 1);
102 printk(verbose_fmt, sanity_file_name(path), line, &vaf);
104 vprintk(format, args);
108 EXPORT_SYMBOL_GPL(__snd_printk);
112 #include <linux/pci.h>
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
119 * Look through the given quirk list and finds a matching entry
120 * with the same PCI SSID. When subdevice is 0, all subdevice
123 * Returns the matched entry pointer, or NULL if nothing matched.
125 const struct snd_pci_quirk *
126 snd_pci_quirk_lookup_id(u16 vendor, u16 device,
127 const struct snd_pci_quirk *list)
129 const struct snd_pci_quirk *q;
131 for (q = list; q->subvendor; q++) {
132 if (q->subvendor != vendor)
135 (device & q->subdevice_mask) == q->subdevice)
140 EXPORT_SYMBOL(snd_pci_quirk_lookup_id);
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
147 * Look through the given quirk list and finds a matching entry
148 * with the same PCI SSID. When subdevice is 0, all subdevice
151 * Returns the matched entry pointer, or NULL if nothing matched.
153 const struct snd_pci_quirk *
154 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
158 return snd_pci_quirk_lookup_id(pci->subsystem_vendor,
159 pci->subsystem_device,
162 EXPORT_SYMBOL(snd_pci_quirk_lookup);
166 * Deferred async signal helpers
168 * Below are a few helper functions to wrap the async signal handling
169 * in the deferred work. The main purpose is to avoid the messy deadlock
170 * around tasklist_lock and co at the kill_fasync() invocation.
171 * fasync_helper() and kill_fasync() are replaced with snd_fasync_helper()
172 * and snd_kill_fasync(), respectively. In addition, snd_fasync_free() has
173 * to be called at releasing the relevant file object.
176 struct fasync_struct *fasync;
180 struct list_head list;
183 static DEFINE_SPINLOCK(snd_fasync_lock);
184 static LIST_HEAD(snd_fasync_list);
186 static void snd_fasync_work_fn(struct work_struct *work)
188 struct snd_fasync *fasync;
190 spin_lock_irq(&snd_fasync_lock);
191 while (!list_empty(&snd_fasync_list)) {
192 fasync = list_first_entry(&snd_fasync_list, struct snd_fasync, list);
193 list_del_init(&fasync->list);
194 spin_unlock_irq(&snd_fasync_lock);
196 kill_fasync(&fasync->fasync, fasync->signal, fasync->poll);
197 spin_lock_irq(&snd_fasync_lock);
199 spin_unlock_irq(&snd_fasync_lock);
202 static DECLARE_WORK(snd_fasync_work, snd_fasync_work_fn);
204 int snd_fasync_helper(int fd, struct file *file, int on,
205 struct snd_fasync **fasyncp)
207 struct snd_fasync *fasync = NULL;
210 fasync = kzalloc(sizeof(*fasync), GFP_KERNEL);
213 INIT_LIST_HEAD(&fasync->list);
216 spin_lock_irq(&snd_fasync_lock);
222 spin_unlock_irq(&snd_fasync_lock);
228 spin_unlock_irq(&snd_fasync_lock);
229 return fasync_helper(fd, file, on, &fasync->fasync);
231 EXPORT_SYMBOL_GPL(snd_fasync_helper);
233 void snd_kill_fasync(struct snd_fasync *fasync, int signal, int poll)
237 if (!fasync || !fasync->on)
239 spin_lock_irqsave(&snd_fasync_lock, flags);
240 fasync->signal = signal;
242 list_move(&fasync->list, &snd_fasync_list);
243 schedule_work(&snd_fasync_work);
244 spin_unlock_irqrestore(&snd_fasync_lock, flags);
246 EXPORT_SYMBOL_GPL(snd_kill_fasync);
248 void snd_fasync_free(struct snd_fasync *fasync)
253 flush_work(&snd_fasync_work);
256 EXPORT_SYMBOL_GPL(snd_fasync_free);