![Takashi Iwai](/assets/img/avatar_default.png)
ALSA Core A new function snd_card_set_generic_dev() is introduced to add the 'generic device' support for devices without proper bus on sysfs. It's a last resort, and should be removed in future when they have a proper bus, instead. Signed-off-by: Takashi Iwai <tiwai@suse.de>
504 lines
13 KiB
C
504 lines
13 KiB
C
/*
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* Advanced Linux Sound Architecture
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* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/driver.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/moduleparam.h>
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#include <sound/core.h>
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#include <sound/minors.h>
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#include <sound/info.h>
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#include <sound/version.h>
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#include <sound/control.h>
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#include <sound/initval.h>
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#include <linux/kmod.h>
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#include <linux/devfs_fs_kernel.h>
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#include <linux/device.h>
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#define SNDRV_OS_MINORS 256
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static int major = CONFIG_SND_MAJOR;
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int snd_major;
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static int cards_limit = 1;
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static int device_mode = S_IFCHR | S_IRUGO | S_IWUGO;
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MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
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MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
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MODULE_LICENSE("GPL");
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module_param(major, int, 0444);
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MODULE_PARM_DESC(major, "Major # for sound driver.");
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module_param(cards_limit, int, 0444);
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MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
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#ifdef CONFIG_DEVFS_FS
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module_param(device_mode, int, 0444);
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MODULE_PARM_DESC(device_mode, "Device file permission mask for devfs.");
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#endif
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MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
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/* this one holds the actual max. card number currently available.
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* as default, it's identical with cards_limit option. when more
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* modules are loaded manually, this limit number increases, too.
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*/
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int snd_ecards_limit;
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static struct list_head snd_minors_hash[SNDRV_CARDS];
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static DECLARE_MUTEX(sound_mutex);
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extern struct class *sound_class;
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#ifdef CONFIG_KMOD
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/**
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* snd_request_card - try to load the card module
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* @card: the card number
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*
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* Tries to load the module "snd-card-X" for the given card number
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* via KMOD. Returns immediately if already loaded.
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*/
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void snd_request_card(int card)
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{
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int locked;
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if (! current->fs->root)
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return;
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read_lock(&snd_card_rwlock);
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locked = snd_cards_lock & (1 << card);
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read_unlock(&snd_card_rwlock);
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if (locked)
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return;
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if (card < 0 || card >= cards_limit)
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return;
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request_module("snd-card-%i", card);
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}
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static void snd_request_other(int minor)
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{
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char *str;
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if (! current->fs->root)
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return;
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switch (minor) {
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case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
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case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
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default: return;
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}
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request_module(str);
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}
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#endif /* request_module support */
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static snd_minor_t *snd_minor_search(int minor)
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{
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struct list_head *list;
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snd_minor_t *mptr;
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list_for_each(list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]) {
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mptr = list_entry(list, snd_minor_t, list);
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if (mptr->number == minor)
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return mptr;
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}
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return NULL;
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}
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static int snd_open(struct inode *inode, struct file *file)
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{
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int minor = iminor(inode);
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int card = SNDRV_MINOR_CARD(minor);
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int dev = SNDRV_MINOR_DEVICE(minor);
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snd_minor_t *mptr = NULL;
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struct file_operations *old_fops;
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int err = 0;
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if (dev != SNDRV_MINOR_SEQUENCER && dev != SNDRV_MINOR_TIMER) {
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if (snd_cards[card] == NULL) {
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#ifdef CONFIG_KMOD
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snd_request_card(card);
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if (snd_cards[card] == NULL)
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#endif
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return -ENODEV;
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}
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} else {
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#ifdef CONFIG_KMOD
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if ((mptr = snd_minor_search(minor)) == NULL)
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snd_request_other(minor);
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#endif
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}
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if (mptr == NULL && (mptr = snd_minor_search(minor)) == NULL)
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return -ENODEV;
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old_fops = file->f_op;
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file->f_op = fops_get(mptr->f_ops);
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if (file->f_op->open)
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err = file->f_op->open(inode, file);
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if (err) {
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fops_put(file->f_op);
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file->f_op = fops_get(old_fops);
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}
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fops_put(old_fops);
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return err;
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}
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static struct file_operations snd_fops =
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{
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.owner = THIS_MODULE,
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.open = snd_open
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};
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static int snd_kernel_minor(int type, snd_card_t * card, int dev)
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{
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int minor;
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switch (type) {
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case SNDRV_DEVICE_TYPE_SEQUENCER:
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case SNDRV_DEVICE_TYPE_TIMER:
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minor = type;
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break;
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case SNDRV_DEVICE_TYPE_CONTROL:
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snd_assert(card != NULL, return -EINVAL);
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minor = SNDRV_MINOR(card->number, type);
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break;
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case SNDRV_DEVICE_TYPE_HWDEP:
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case SNDRV_DEVICE_TYPE_RAWMIDI:
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case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
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case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
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snd_assert(card != NULL, return -EINVAL);
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minor = SNDRV_MINOR(card->number, type + dev);
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break;
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default:
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return -EINVAL;
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}
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snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
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return minor;
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}
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/**
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* snd_register_device - Register the ALSA device file for the card
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* @type: the device type, SNDRV_DEVICE_TYPE_XXX
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* @card: the card instance
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* @dev: the device index
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* @reg: the snd_minor_t record
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* @name: the device file name
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*
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* Registers an ALSA device file for the given card.
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* The operators have to be set in reg parameter.
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*
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* Retrurns zero if successful, or a negative error code on failure.
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*/
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int snd_register_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
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{
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int minor = snd_kernel_minor(type, card, dev);
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snd_minor_t *preg;
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struct device *device = NULL;
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if (minor < 0)
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return minor;
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snd_assert(name, return -EINVAL);
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preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t) + strlen(name) + 1, GFP_KERNEL);
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if (preg == NULL)
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return -ENOMEM;
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*preg = *reg;
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preg->number = minor;
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preg->device = dev;
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strcpy(preg->name, name);
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down(&sound_mutex);
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if (snd_minor_search(minor)) {
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up(&sound_mutex);
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kfree(preg);
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return -EBUSY;
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}
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list_add_tail(&preg->list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]);
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if (strncmp(name, "controlC", 8) || card->number >= cards_limit)
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devfs_mk_cdev(MKDEV(major, minor), S_IFCHR | device_mode, "snd/%s", name);
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if (card)
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device = card->dev;
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class_device_create(sound_class, MKDEV(major, minor), device, "%s", name);
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up(&sound_mutex);
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return 0;
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}
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/**
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* snd_unregister_device - unregister the device on the given card
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* @type: the device type, SNDRV_DEVICE_TYPE_XXX
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* @card: the card instance
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* @dev: the device index
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*
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* Unregisters the device file already registered via
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* snd_register_device().
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*
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* Returns zero if sucecessful, or a negative error code on failure
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*/
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int snd_unregister_device(int type, snd_card_t * card, int dev)
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{
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int minor = snd_kernel_minor(type, card, dev);
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snd_minor_t *mptr;
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if (minor < 0)
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return minor;
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down(&sound_mutex);
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if ((mptr = snd_minor_search(minor)) == NULL) {
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up(&sound_mutex);
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return -EINVAL;
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}
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if (strncmp(mptr->name, "controlC", 8) || card->number >= cards_limit) /* created in sound.c */
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devfs_remove("snd/%s", mptr->name);
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class_device_destroy(sound_class, MKDEV(major, minor));
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list_del(&mptr->list);
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up(&sound_mutex);
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kfree(mptr);
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return 0;
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}
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/*
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* INFO PART
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*/
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static snd_info_entry_t *snd_minor_info_entry = NULL;
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static void snd_minor_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
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{
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int card, device;
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struct list_head *list;
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snd_minor_t *mptr;
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down(&sound_mutex);
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for (card = 0; card < SNDRV_CARDS; card++) {
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list_for_each(list, &snd_minors_hash[card]) {
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mptr = list_entry(list, snd_minor_t, list);
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if (SNDRV_MINOR_DEVICE(mptr->number) != SNDRV_MINOR_SEQUENCER) {
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if ((device = mptr->device) >= 0)
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snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, device, mptr->comment);
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else
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snd_iprintf(buffer, "%3i: [%i] : %s\n", mptr->number, card, mptr->comment);
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} else {
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snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment);
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}
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}
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}
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up(&sound_mutex);
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}
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int __init snd_minor_info_init(void)
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{
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snd_info_entry_t *entry;
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entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
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if (entry) {
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entry->c.text.read_size = PAGE_SIZE;
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entry->c.text.read = snd_minor_info_read;
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if (snd_info_register(entry) < 0) {
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snd_info_free_entry(entry);
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entry = NULL;
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}
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}
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snd_minor_info_entry = entry;
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return 0;
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}
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int __exit snd_minor_info_done(void)
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{
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if (snd_minor_info_entry)
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snd_info_unregister(snd_minor_info_entry);
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return 0;
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}
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/*
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* INIT PART
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*/
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#ifdef CONFIG_SND_GENERIC_DRIVER
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extern struct device_driver snd_generic_driver;
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#endif
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static int __init alsa_sound_init(void)
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{
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short controlnum;
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int err;
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int card;
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snd_major = major;
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snd_ecards_limit = cards_limit;
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for (card = 0; card < SNDRV_CARDS; card++)
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INIT_LIST_HEAD(&snd_minors_hash[card]);
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if ((err = snd_oss_init_module()) < 0)
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return err;
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devfs_mk_dir("snd");
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if (register_chrdev(major, "alsa", &snd_fops)) {
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snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
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devfs_remove("snd");
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return -EIO;
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}
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snd_memory_init();
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if (snd_info_init() < 0) {
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snd_memory_done();
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unregister_chrdev(major, "alsa");
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devfs_remove("snd");
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return -ENOMEM;
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}
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snd_info_minor_register();
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#ifdef CONFIG_SND_GENERIC_DRIVER
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driver_register(&snd_generic_driver);
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#endif
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for (controlnum = 0; controlnum < cards_limit; controlnum++)
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devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR | device_mode, "snd/controlC%d", controlnum);
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#ifndef MODULE
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printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
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#endif
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return 0;
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}
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static void __exit alsa_sound_exit(void)
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{
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short controlnum;
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for (controlnum = 0; controlnum < cards_limit; controlnum++)
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devfs_remove("snd/controlC%d", controlnum);
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#ifdef CONFIG_SND_GENERIC_DRIVER
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driver_unregister(&snd_generic_driver);
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#endif
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snd_info_minor_unregister();
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snd_info_done();
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snd_memory_done();
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if (unregister_chrdev(major, "alsa") != 0)
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snd_printk(KERN_ERR "unable to unregister major device number %d\n", major);
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devfs_remove("snd");
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}
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module_init(alsa_sound_init)
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module_exit(alsa_sound_exit)
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/* sound.c */
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EXPORT_SYMBOL(snd_major);
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EXPORT_SYMBOL(snd_ecards_limit);
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#if defined(CONFIG_KMOD)
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EXPORT_SYMBOL(snd_request_card);
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#endif
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EXPORT_SYMBOL(snd_register_device);
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EXPORT_SYMBOL(snd_unregister_device);
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#if defined(CONFIG_SND_OSSEMUL)
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EXPORT_SYMBOL(snd_register_oss_device);
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EXPORT_SYMBOL(snd_unregister_oss_device);
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#endif
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/* memory.c */
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#ifdef CONFIG_SND_DEBUG_MEMORY
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EXPORT_SYMBOL(snd_hidden_kmalloc);
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EXPORT_SYMBOL(snd_hidden_kcalloc);
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EXPORT_SYMBOL(snd_hidden_kfree);
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EXPORT_SYMBOL(snd_hidden_vmalloc);
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EXPORT_SYMBOL(snd_hidden_vfree);
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EXPORT_SYMBOL(snd_hidden_kstrdup);
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#endif
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EXPORT_SYMBOL(copy_to_user_fromio);
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EXPORT_SYMBOL(copy_from_user_toio);
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/* init.c */
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EXPORT_SYMBOL(snd_cards);
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#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
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EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
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#endif
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EXPORT_SYMBOL(snd_card_new);
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EXPORT_SYMBOL(snd_card_disconnect);
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EXPORT_SYMBOL(snd_card_free);
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EXPORT_SYMBOL(snd_card_free_in_thread);
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EXPORT_SYMBOL(snd_card_register);
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EXPORT_SYMBOL(snd_component_add);
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EXPORT_SYMBOL(snd_card_file_add);
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EXPORT_SYMBOL(snd_card_file_remove);
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#ifdef CONFIG_SND_GENERIC_DRIVER
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EXPORT_SYMBOL(snd_card_set_generic_dev);
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#endif
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#ifdef CONFIG_PM
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EXPORT_SYMBOL(snd_power_wait);
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EXPORT_SYMBOL(snd_card_set_pm_callback);
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#ifdef CONFIG_SND_GENERIC_DRIVER
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EXPORT_SYMBOL(snd_card_set_generic_pm_callback);
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#endif
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#ifdef CONFIG_PCI
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EXPORT_SYMBOL(snd_card_pci_suspend);
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EXPORT_SYMBOL(snd_card_pci_resume);
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#endif
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#endif
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/* device.c */
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EXPORT_SYMBOL(snd_device_new);
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EXPORT_SYMBOL(snd_device_register);
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EXPORT_SYMBOL(snd_device_free);
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/* isadma.c */
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#ifdef CONFIG_ISA_DMA_API
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EXPORT_SYMBOL(snd_dma_program);
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EXPORT_SYMBOL(snd_dma_disable);
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EXPORT_SYMBOL(snd_dma_pointer);
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#endif
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/* info.c */
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#ifdef CONFIG_PROC_FS
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EXPORT_SYMBOL(snd_seq_root);
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EXPORT_SYMBOL(snd_iprintf);
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EXPORT_SYMBOL(snd_info_get_line);
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EXPORT_SYMBOL(snd_info_get_str);
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EXPORT_SYMBOL(snd_info_create_module_entry);
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EXPORT_SYMBOL(snd_info_create_card_entry);
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EXPORT_SYMBOL(snd_info_free_entry);
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EXPORT_SYMBOL(snd_info_register);
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EXPORT_SYMBOL(snd_info_unregister);
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EXPORT_SYMBOL(snd_card_proc_new);
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#endif
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/* info_oss.c */
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#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
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EXPORT_SYMBOL(snd_oss_info_register);
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#endif
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/* control.c */
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EXPORT_SYMBOL(snd_ctl_new);
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EXPORT_SYMBOL(snd_ctl_new1);
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EXPORT_SYMBOL(snd_ctl_free_one);
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EXPORT_SYMBOL(snd_ctl_add);
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EXPORT_SYMBOL(snd_ctl_remove);
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EXPORT_SYMBOL(snd_ctl_remove_id);
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EXPORT_SYMBOL(snd_ctl_rename_id);
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EXPORT_SYMBOL(snd_ctl_find_numid);
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EXPORT_SYMBOL(snd_ctl_find_id);
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EXPORT_SYMBOL(snd_ctl_notify);
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EXPORT_SYMBOL(snd_ctl_register_ioctl);
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EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
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#ifdef CONFIG_COMPAT
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EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
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EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
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#endif
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EXPORT_SYMBOL(snd_ctl_elem_read);
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EXPORT_SYMBOL(snd_ctl_elem_write);
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/* misc.c */
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EXPORT_SYMBOL(snd_task_name);
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#ifdef CONFIG_SND_VERBOSE_PRINTK
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EXPORT_SYMBOL(snd_verbose_printk);
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#endif
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#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
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EXPORT_SYMBOL(snd_verbose_printd);
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#endif
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/* wrappers */
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#ifdef CONFIG_SND_DEBUG_MEMORY
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EXPORT_SYMBOL(snd_wrapper_kmalloc);
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EXPORT_SYMBOL(snd_wrapper_kfree);
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EXPORT_SYMBOL(snd_wrapper_vmalloc);
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EXPORT_SYMBOL(snd_wrapper_vfree);
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#endif
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