diff options
Diffstat (limited to 'sound/core/sound.c')
| -rw-r--r-- | sound/core/sound.c | 491 |
1 files changed, 491 insertions, 0 deletions
diff --git a/sound/core/sound.c b/sound/core/sound.c new file mode 100644 index 000000000000..88e052079f85 --- /dev/null +++ b/sound/core/sound.c @@ -0,0 +1,491 @@ +/* + * Advanced Linux Sound Architecture + * Copyright (c) by Jaroslav Kysela <perex@suse.cz> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <sound/driver.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/time.h> +#include <linux/moduleparam.h> +#include <sound/core.h> +#include <sound/minors.h> +#include <sound/info.h> +#include <sound/version.h> +#include <sound/control.h> +#include <sound/initval.h> +#include <linux/kmod.h> +#include <linux/devfs_fs_kernel.h> +#include <linux/device.h> + +#define SNDRV_OS_MINORS 256 + +static int major = CONFIG_SND_MAJOR; +int snd_major; +static int cards_limit = 1; +static int device_mode = S_IFCHR | S_IRUGO | S_IWUGO; + +MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>"); +MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards."); +MODULE_LICENSE("GPL"); +module_param(major, int, 0444); +MODULE_PARM_DESC(major, "Major # for sound driver."); +module_param(cards_limit, int, 0444); +MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards."); +#ifdef CONFIG_DEVFS_FS +module_param(device_mode, int, 0444); +MODULE_PARM_DESC(device_mode, "Device file permission mask for devfs."); +#endif +MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR); + +/* this one holds the actual max. card number currently available. + * as default, it's identical with cards_limit option. when more + * modules are loaded manually, this limit number increases, too. + */ +int snd_ecards_limit; + +static struct list_head snd_minors_hash[SNDRV_CARDS]; + +static DECLARE_MUTEX(sound_mutex); + +extern struct class_simple *sound_class; + + +#ifdef CONFIG_KMOD + +/** + * snd_request_card - try to load the card module + * @card: the card number + * + * Tries to load the module "snd-card-X" for the given card number + * via KMOD. Returns immediately if already loaded. + */ +void snd_request_card(int card) +{ + int locked; + + if (! current->fs->root) + return; + read_lock(&snd_card_rwlock); + locked = snd_cards_lock & (1 << card); + read_unlock(&snd_card_rwlock); + if (locked) + return; + if (card < 0 || card >= cards_limit) + return; + request_module("snd-card-%i", card); +} + +static void snd_request_other(int minor) +{ + char *str; + + if (! current->fs->root) + return; + switch (minor) { + case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break; + case SNDRV_MINOR_TIMER: str = "snd-timer"; break; + default: return; + } + request_module(str); +} + +#endif /* request_module support */ + +static snd_minor_t *snd_minor_search(int minor) +{ + struct list_head *list; + snd_minor_t *mptr; + + list_for_each(list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]) { + mptr = list_entry(list, snd_minor_t, list); + if (mptr->number == minor) + return mptr; + } + return NULL; +} + +static int snd_open(struct inode *inode, struct file *file) +{ + int minor = iminor(inode); + int card = SNDRV_MINOR_CARD(minor); + int dev = SNDRV_MINOR_DEVICE(minor); + snd_minor_t *mptr = NULL; + struct file_operations *old_fops; + int err = 0; + + if (dev != SNDRV_MINOR_SEQUENCER && dev != SNDRV_MINOR_TIMER) { + if (snd_cards[card] == NULL) { +#ifdef CONFIG_KMOD + snd_request_card(card); + if (snd_cards[card] == NULL) +#endif + return -ENODEV; + } + } else { +#ifdef CONFIG_KMOD + if ((mptr = snd_minor_search(minor)) == NULL) + snd_request_other(minor); +#endif + } + if (mptr == NULL && (mptr = snd_minor_search(minor)) == NULL) + return -ENODEV; + old_fops = file->f_op; + file->f_op = fops_get(mptr->f_ops); + if (file->f_op->open) + err = file->f_op->open(inode, file); + if (err) { + fops_put(file->f_op); + file->f_op = fops_get(old_fops); + } + fops_put(old_fops); + return err; +} + +static struct file_operations snd_fops = +{ + .owner = THIS_MODULE, + .open = snd_open +}; + +static int snd_kernel_minor(int type, snd_card_t * card, int dev) +{ + int minor; + + switch (type) { + case SNDRV_DEVICE_TYPE_SEQUENCER: + case SNDRV_DEVICE_TYPE_TIMER: + minor = type; + break; + case SNDRV_DEVICE_TYPE_CONTROL: + snd_assert(card != NULL, return -EINVAL); + minor = SNDRV_MINOR(card->number, type); + break; + case SNDRV_DEVICE_TYPE_HWDEP: + case SNDRV_DEVICE_TYPE_RAWMIDI: + case SNDRV_DEVICE_TYPE_PCM_PLAYBACK: + case SNDRV_DEVICE_TYPE_PCM_CAPTURE: + snd_assert(card != NULL, return -EINVAL); + minor = SNDRV_MINOR(card->number, type + dev); + break; + default: + return -EINVAL; + } + snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL); + return minor; +} + +/** + * snd_register_device - Register the ALSA device file for the card + * @type: the device type, SNDRV_DEVICE_TYPE_XXX + * @card: the card instance + * @dev: the device index + * @reg: the snd_minor_t record + * @name: the device file name + * + * Registers an ALSA device file for the given card. + * The operators have to be set in reg parameter. + * + * Retrurns zero if successful, or a negative error code on failure. + */ +int snd_register_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name) +{ + int minor = snd_kernel_minor(type, card, dev); + snd_minor_t *preg; + struct device *device = NULL; + + if (minor < 0) + return minor; + snd_assert(name, return -EINVAL); + preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t) + strlen(name) + 1, GFP_KERNEL); + if (preg == NULL) + return -ENOMEM; + *preg = *reg; + preg->number = minor; + preg->device = dev; + strcpy(preg->name, name); + down(&sound_mutex); + if (snd_minor_search(minor)) { + up(&sound_mutex); + kfree(preg); + return -EBUSY; + } + list_add_tail(&preg->list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]); + if (strncmp(name, "controlC", 8) || card->number >= cards_limit) + devfs_mk_cdev(MKDEV(major, minor), S_IFCHR | device_mode, "snd/%s", name); + if (card) + device = card->dev; + class_simple_device_add(sound_class, MKDEV(major, minor), device, name); + + up(&sound_mutex); + return 0; +} + +/** + * snd_unregister_device - unregister the device on the given card + * @type: the device type, SNDRV_DEVICE_TYPE_XXX + * @card: the card instance + * @dev: the device index + * + * Unregisters the device file already registered via + * snd_register_device(). + * + * Returns zero if sucecessful, or a negative error code on failure + */ +int snd_unregister_device(int type, snd_card_t * card, int dev) +{ + int minor = snd_kernel_minor(type, card, dev); + snd_minor_t *mptr; + + if (minor < 0) + return minor; + down(&sound_mutex); + if ((mptr = snd_minor_search(minor)) == NULL) { + up(&sound_mutex); + return -EINVAL; + } + + if (strncmp(mptr->name, "controlC", 8) || card->number >= cards_limit) /* created in sound.c */ + devfs_remove("snd/%s", mptr->name); + class_simple_device_remove(MKDEV(major, minor)); + + list_del(&mptr->list); + up(&sound_mutex); + kfree(mptr); + return 0; +} + +/* + * INFO PART + */ + +static snd_info_entry_t *snd_minor_info_entry = NULL; + +static void snd_minor_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) +{ + int card, device; + struct list_head *list; + snd_minor_t *mptr; + + down(&sound_mutex); + for (card = 0; card < SNDRV_CARDS; card++) { + list_for_each(list, &snd_minors_hash[card]) { + mptr = list_entry(list, snd_minor_t, list); + if (SNDRV_MINOR_DEVICE(mptr->number) != SNDRV_MINOR_SEQUENCER) { + if ((device = mptr->device) >= 0) + snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, device, mptr->comment); + else + snd_iprintf(buffer, "%3i: [%i] : %s\n", mptr->number, card, mptr->comment); + } else { + snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment); + } + } + } + up(&sound_mutex); +} + +int __init snd_minor_info_init(void) +{ + snd_info_entry_t *entry; + + entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL); + if (entry) { + entry->c.text.read_size = PAGE_SIZE; + entry->c.text.read = snd_minor_info_read; + if (snd_info_register(entry) < 0) { + snd_info_free_entry(entry); + entry = NULL; + } + } + snd_minor_info_entry = entry; + return 0; +} + +int __exit snd_minor_info_done(void) +{ + if (snd_minor_info_entry) + snd_info_unregister(snd_minor_info_entry); + return 0; +} + +/* + * INIT PART + */ + +static int __init alsa_sound_init(void) +{ + short controlnum; + int err; + int card; + + snd_major = major; + snd_ecards_limit = cards_limit; + for (card = 0; card < SNDRV_CARDS; card++) + INIT_LIST_HEAD(&snd_minors_hash[card]); + if ((err = snd_oss_init_module()) < 0) + return err; + devfs_mk_dir("snd"); + if (register_chrdev(major, "alsa", &snd_fops)) { + snd_printk(KERN_ERR "unable to register native major device number %d\n", major); + devfs_remove("snd"); + return -EIO; + } + snd_memory_init(); + if (snd_info_init() < 0) { + snd_memory_done(); + unregister_chrdev(major, "alsa"); + devfs_remove("snd"); + return -ENOMEM; + } + snd_info_minor_register(); + for (controlnum = 0; controlnum < cards_limit; controlnum++) + devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR | device_mode, "snd/controlC%d", controlnum); +#ifndef MODULE + printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"); +#endif + return 0; +} + +static void __exit alsa_sound_exit(void) +{ + short controlnum; + + for (controlnum = 0; controlnum < cards_limit; controlnum++) + devfs_remove("snd/controlC%d", controlnum); + + snd_info_minor_unregister(); + snd_info_done(); + snd_memory_done(); + if (unregister_chrdev(major, "alsa") != 0) + snd_printk(KERN_ERR "unable to unregister major device number %d\n", major); + devfs_remove("snd"); +} + +module_init(alsa_sound_init) +module_exit(alsa_sound_exit) + + /* sound.c */ +EXPORT_SYMBOL(snd_major); +EXPORT_SYMBOL(snd_ecards_limit); +#if defined(CONFIG_KMOD) +EXPORT_SYMBOL(snd_request_card); +#endif +EXPORT_SYMBOL(snd_register_device); +EXPORT_SYMBOL(snd_unregister_device); +#if defined(CONFIG_SND_OSSEMUL) +EXPORT_SYMBOL(snd_register_oss_device); +EXPORT_SYMBOL(snd_unregister_oss_device); +#endif + /* memory.c */ +#ifdef CONFIG_SND_DEBUG_MEMORY +EXPORT_SYMBOL(snd_hidden_kmalloc); +EXPORT_SYMBOL(snd_hidden_kcalloc); +EXPORT_SYMBOL(snd_hidden_kfree); +EXPORT_SYMBOL(snd_hidden_vmalloc); +EXPORT_SYMBOL(snd_hidden_vfree); +#endif +EXPORT_SYMBOL(snd_kmalloc_strdup); +EXPORT_SYMBOL(copy_to_user_fromio); +EXPORT_SYMBOL(copy_from_user_toio); + /* init.c */ +EXPORT_SYMBOL(snd_cards); +#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) +EXPORT_SYMBOL(snd_mixer_oss_notify_callback); +#endif +EXPORT_SYMBOL(snd_card_new); +EXPORT_SYMBOL(snd_card_disconnect); +EXPORT_SYMBOL(snd_card_free); +EXPORT_SYMBOL(snd_card_free_in_thread); +EXPORT_SYMBOL(snd_card_register); +EXPORT_SYMBOL(snd_component_add); +EXPORT_SYMBOL(snd_card_file_add); +EXPORT_SYMBOL(snd_card_file_remove); +#ifdef CONFIG_PM +EXPORT_SYMBOL(snd_power_wait); +EXPORT_SYMBOL(snd_card_set_pm_callback); +#if defined(CONFIG_PM) && defined(CONFIG_SND_GENERIC_PM) +EXPORT_SYMBOL(snd_card_set_generic_pm_callback); +#endif +#ifdef CONFIG_PCI +EXPORT_SYMBOL(snd_card_pci_suspend); +EXPORT_SYMBOL(snd_card_pci_resume); +#endif +#endif + /* device.c */ +EXPORT_SYMBOL(snd_device_new); +EXPORT_SYMBOL(snd_device_register); +EXPORT_SYMBOL(snd_device_free); +EXPORT_SYMBOL(snd_device_free_all); + /* isadma.c */ +#ifdef CONFIG_ISA +EXPORT_SYMBOL(snd_dma_program); +EXPORT_SYMBOL(snd_dma_disable); +EXPORT_SYMBOL(snd_dma_pointer); +#endif + /* info.c */ +#ifdef CONFIG_PROC_FS +EXPORT_SYMBOL(snd_seq_root); +EXPORT_SYMBOL(snd_iprintf); +EXPORT_SYMBOL(snd_info_get_line); +EXPORT_SYMBOL(snd_info_get_str); +EXPORT_SYMBOL(snd_info_create_module_entry); +EXPORT_SYMBOL(snd_info_create_card_entry); +EXPORT_SYMBOL(snd_info_free_entry); +EXPORT_SYMBOL(snd_info_register); +EXPORT_SYMBOL(snd_info_unregister); +EXPORT_SYMBOL(snd_card_proc_new); +#endif + /* info_oss.c */ +#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS) +EXPORT_SYMBOL(snd_oss_info_register); +#endif + /* control.c */ +EXPORT_SYMBOL(snd_ctl_new); +EXPORT_SYMBOL(snd_ctl_new1); +EXPORT_SYMBOL(snd_ctl_free_one); +EXPORT_SYMBOL(snd_ctl_add); +EXPORT_SYMBOL(snd_ctl_remove); +EXPORT_SYMBOL(snd_ctl_remove_id); +EXPORT_SYMBOL(snd_ctl_rename_id); +EXPORT_SYMBOL(snd_ctl_find_numid); +EXPORT_SYMBOL(snd_ctl_find_id); +EXPORT_SYMBOL(snd_ctl_notify); +EXPORT_SYMBOL(snd_ctl_register_ioctl); +EXPORT_SYMBOL(snd_ctl_unregister_ioctl); +#ifdef CONFIG_COMPAT +EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); +EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); +#endif +EXPORT_SYMBOL(snd_ctl_elem_read); +EXPORT_SYMBOL(snd_ctl_elem_write); + /* misc.c */ +EXPORT_SYMBOL(snd_task_name); +#ifdef CONFIG_SND_VERBOSE_PRINTK +EXPORT_SYMBOL(snd_verbose_printk); +#endif +#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK) +EXPORT_SYMBOL(snd_verbose_printd); +#endif + /* wrappers */ +#ifdef CONFIG_SND_DEBUG_MEMORY +EXPORT_SYMBOL(snd_wrapper_kmalloc); +EXPORT_SYMBOL(snd_wrapper_kfree); +EXPORT_SYMBOL(snd_wrapper_vmalloc); +EXPORT_SYMBOL(snd_wrapper_vfree); +#endif |