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);
53 EXPORT_SYMBOL(release_and_free_resource);
55 #ifdef CONFIG_SND_VERBOSE_PRINTK
56 /* strip the leading path if the given path is absolute */
57 static const char *sanity_file_name(const char *path)
60 return strrchr(path, '/') + 1;
66 #if defined(CONFIG_SND_DEBUG) || defined(CONFIG_SND_VERBOSE_PRINTK)
67 void __snd_printk(unsigned int level, const char *path, int line,
68 const char *format, ...)
71 #ifdef CONFIG_SND_VERBOSE_PRINTK
74 char verbose_fmt[] = KERN_DEFAULT "ALSA %s:%d %pV";
77 #ifdef CONFIG_SND_DEBUG
82 va_start(args, format);
83 #ifdef CONFIG_SND_VERBOSE_PRINTK
87 kern_level = printk_get_level(format);
89 const char *end_of_header = printk_skip_level(format);
90 memcpy(verbose_fmt, format, end_of_header - format);
91 vaf.fmt = end_of_header;
93 memcpy(verbose_fmt, KERN_DEBUG, sizeof(KERN_DEBUG) - 1);
94 printk(verbose_fmt, sanity_file_name(path), line, &vaf);
97 vprintk(format, args);
101 EXPORT_SYMBOL_GPL(__snd_printk);
105 #include <linux/pci.h>
107 * snd_pci_quirk_lookup_id - look up a PCI SSID quirk list
108 * @vendor: PCI SSV id
109 * @device: PCI SSD id
110 * @list: quirk list, terminated by a null entry
112 * Look through the given quirk list and finds a matching entry
113 * with the same PCI SSID. When subdevice is 0, all subdevice
116 * Returns the matched entry pointer, or NULL if nothing matched.
118 const struct snd_pci_quirk *
119 snd_pci_quirk_lookup_id(u16 vendor, u16 device,
120 const struct snd_pci_quirk *list)
122 const struct snd_pci_quirk *q;
124 for (q = list; q->subvendor; q++) {
125 if (q->subvendor != vendor)
128 (device & q->subdevice_mask) == q->subdevice)
133 EXPORT_SYMBOL(snd_pci_quirk_lookup_id);
136 * snd_pci_quirk_lookup - look up a PCI SSID quirk list
137 * @pci: pci_dev handle
138 * @list: quirk list, terminated by a null entry
140 * Look through the given quirk list and finds a matching entry
141 * with the same PCI SSID. When subdevice is 0, all subdevice
144 * Returns the matched entry pointer, or NULL if nothing matched.
146 const struct snd_pci_quirk *
147 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
151 return snd_pci_quirk_lookup_id(pci->subsystem_vendor,
152 pci->subsystem_device,
155 EXPORT_SYMBOL(snd_pci_quirk_lookup);
159 * Deferred async signal helpers
161 * Below are a few helper functions to wrap the async signal handling
162 * in the deferred work. The main purpose is to avoid the messy deadlock
163 * around tasklist_lock and co at the kill_fasync() invocation.
164 * fasync_helper() and kill_fasync() are replaced with snd_fasync_helper()
165 * and snd_kill_fasync(), respectively. In addition, snd_fasync_free() has
166 * to be called at releasing the relevant file object.
169 struct fasync_struct *fasync;
173 struct list_head list;
176 static DEFINE_SPINLOCK(snd_fasync_lock);
177 static LIST_HEAD(snd_fasync_list);
179 static void snd_fasync_work_fn(struct work_struct *work)
181 struct snd_fasync *fasync;
183 spin_lock_irq(&snd_fasync_lock);
184 while (!list_empty(&snd_fasync_list)) {
185 fasync = list_first_entry(&snd_fasync_list, struct snd_fasync, list);
186 list_del_init(&fasync->list);
187 spin_unlock_irq(&snd_fasync_lock);
189 kill_fasync(&fasync->fasync, fasync->signal, fasync->poll);
190 spin_lock_irq(&snd_fasync_lock);
192 spin_unlock_irq(&snd_fasync_lock);
195 static DECLARE_WORK(snd_fasync_work, snd_fasync_work_fn);
197 int snd_fasync_helper(int fd, struct file *file, int on,
198 struct snd_fasync **fasyncp)
200 struct snd_fasync *fasync = NULL;
203 fasync = kzalloc(sizeof(*fasync), GFP_KERNEL);
206 INIT_LIST_HEAD(&fasync->list);
209 spin_lock_irq(&snd_fasync_lock);
215 spin_unlock_irq(&snd_fasync_lock);
221 spin_unlock_irq(&snd_fasync_lock);
222 return fasync_helper(fd, file, on, &fasync->fasync);
224 EXPORT_SYMBOL_GPL(snd_fasync_helper);
226 void snd_kill_fasync(struct snd_fasync *fasync, int signal, int poll)
230 if (!fasync || !fasync->on)
232 spin_lock_irqsave(&snd_fasync_lock, flags);
233 fasync->signal = signal;
235 list_move(&fasync->list, &snd_fasync_list);
236 schedule_work(&snd_fasync_work);
237 spin_unlock_irqrestore(&snd_fasync_lock, flags);
239 EXPORT_SYMBOL_GPL(snd_kill_fasync);
241 void snd_fasync_free(struct snd_fasync *fasync)
246 flush_work(&snd_fasync_work);
249 EXPORT_SYMBOL_GPL(snd_fasync_free);