diff options
Diffstat (limited to 'sound/core/hwdep.c')
-rw-r--r-- | sound/core/hwdep.c | 524 |
1 files changed, 524 insertions, 0 deletions
diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c new file mode 100644 index 00000000000..997dd41c584 --- /dev/null +++ b/sound/core/hwdep.c @@ -0,0 +1,524 @@ +/* + * Hardware dependent layer + * 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/major.h> +#include <linux/init.h> +#include <linux/smp_lock.h> +#include <linux/slab.h> +#include <linux/time.h> +#include <sound/core.h> +#include <sound/control.h> +#include <sound/minors.h> +#include <sound/hwdep.h> +#include <sound/info.h> + +MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>"); +MODULE_DESCRIPTION("Hardware dependent layer"); +MODULE_LICENSE("GPL"); + +static snd_hwdep_t *snd_hwdep_devices[SNDRV_CARDS * SNDRV_MINOR_HWDEPS]; + +static DECLARE_MUTEX(register_mutex); + +static int snd_hwdep_free(snd_hwdep_t *hwdep); +static int snd_hwdep_dev_free(snd_device_t *device); +static int snd_hwdep_dev_register(snd_device_t *device); +static int snd_hwdep_dev_unregister(snd_device_t *device); + +/* + + */ + +static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig) +{ + snd_hwdep_t *hw = file->private_data; + if (hw->ops.llseek) + return hw->ops.llseek(hw, file, offset, orig); + return -ENXIO; +} + +static ssize_t snd_hwdep_read(struct file * file, char __user *buf, size_t count, loff_t *offset) +{ + snd_hwdep_t *hw = file->private_data; + if (hw->ops.read) + return hw->ops.read(hw, buf, count, offset); + return -ENXIO; +} + +static ssize_t snd_hwdep_write(struct file * file, const char __user *buf, size_t count, loff_t *offset) +{ + snd_hwdep_t *hw = file->private_data; + if (hw->ops.write) + return hw->ops.write(hw, buf, count, offset); + return -ENXIO; +} + +static int snd_hwdep_open(struct inode *inode, struct file * file) +{ + int major = imajor(inode); + int cardnum; + int device; + snd_hwdep_t *hw; + int err; + wait_queue_t wait; + + switch (major) { + case CONFIG_SND_MAJOR: + cardnum = SNDRV_MINOR_CARD(iminor(inode)); + device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_HWDEP; + break; +#ifdef CONFIG_SND_OSSEMUL + case SOUND_MAJOR: + cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode)); + device = 0; + break; +#endif + default: + return -ENXIO; + } + cardnum %= SNDRV_CARDS; + device %= SNDRV_MINOR_HWDEPS; + hw = snd_hwdep_devices[(cardnum * SNDRV_MINOR_HWDEPS) + device]; + if (hw == NULL) + return -ENODEV; + + if (!hw->ops.open) + return -ENXIO; +#ifdef CONFIG_SND_OSSEMUL + if (major == SOUND_MAJOR && hw->oss_type < 0) + return -ENXIO; +#endif + + if (!try_module_get(hw->card->module)) + return -EFAULT; + + init_waitqueue_entry(&wait, current); + add_wait_queue(&hw->open_wait, &wait); + down(&hw->open_mutex); + while (1) { + if (hw->exclusive && hw->used > 0) { + err = -EBUSY; + break; + } + err = hw->ops.open(hw, file); + if (err >= 0) + break; + if (err == -EAGAIN) { + if (file->f_flags & O_NONBLOCK) { + err = -EBUSY; + break; + } + } else + break; + set_current_state(TASK_INTERRUPTIBLE); + up(&hw->open_mutex); + schedule(); + down(&hw->open_mutex); + if (signal_pending(current)) { + err = -ERESTARTSYS; + break; + } + } + remove_wait_queue(&hw->open_wait, &wait); + if (err >= 0) { + err = snd_card_file_add(hw->card, file); + if (err >= 0) { + file->private_data = hw; + hw->used++; + } else { + if (hw->ops.release) + hw->ops.release(hw, file); + } + } + up(&hw->open_mutex); + if (err < 0) + module_put(hw->card->module); + return err; +} + +static int snd_hwdep_release(struct inode *inode, struct file * file) +{ + int err = -ENXIO; + snd_hwdep_t *hw = file->private_data; + down(&hw->open_mutex); + if (hw->ops.release) { + err = hw->ops.release(hw, file); + wake_up(&hw->open_wait); + } + if (hw->used > 0) + hw->used--; + snd_card_file_remove(hw->card, file); + up(&hw->open_mutex); + module_put(hw->card->module); + return err; +} + +static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait) +{ + snd_hwdep_t *hw = file->private_data; + if (hw->ops.poll) + return hw->ops.poll(hw, file, wait); + return 0; +} + +static int snd_hwdep_info(snd_hwdep_t *hw, snd_hwdep_info_t __user *_info) +{ + snd_hwdep_info_t info; + + memset(&info, 0, sizeof(info)); + info.card = hw->card->number; + strlcpy(info.id, hw->id, sizeof(info.id)); + strlcpy(info.name, hw->name, sizeof(info.name)); + info.iface = hw->iface; + if (copy_to_user(_info, &info, sizeof(info))) + return -EFAULT; + return 0; +} + +static int snd_hwdep_dsp_status(snd_hwdep_t *hw, snd_hwdep_dsp_status_t __user *_info) +{ + snd_hwdep_dsp_status_t info; + int err; + + if (! hw->ops.dsp_status) + return -ENXIO; + memset(&info, 0, sizeof(info)); + info.dsp_loaded = hw->dsp_loaded; + if ((err = hw->ops.dsp_status(hw, &info)) < 0) + return err; + if (copy_to_user(_info, &info, sizeof(info))) + return -EFAULT; + return 0; +} + +static int snd_hwdep_dsp_load(snd_hwdep_t *hw, snd_hwdep_dsp_image_t __user *_info) +{ + snd_hwdep_dsp_image_t info; + int err; + + if (! hw->ops.dsp_load) + return -ENXIO; + memset(&info, 0, sizeof(info)); + if (copy_from_user(&info, _info, sizeof(info))) + return -EFAULT; + /* check whether the dsp was already loaded */ + if (hw->dsp_loaded & (1 << info.index)) + return -EBUSY; + if (!access_ok(VERIFY_READ, info.image, info.length)) + return -EFAULT; + err = hw->ops.dsp_load(hw, &info); + if (err < 0) + return err; + hw->dsp_loaded |= (1 << info.index); + return 0; +} + +static long snd_hwdep_ioctl(struct file * file, unsigned int cmd, unsigned long arg) +{ + snd_hwdep_t *hw = file->private_data; + void __user *argp = (void __user *)arg; + switch (cmd) { + case SNDRV_HWDEP_IOCTL_PVERSION: + return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp); + case SNDRV_HWDEP_IOCTL_INFO: + return snd_hwdep_info(hw, argp); + case SNDRV_HWDEP_IOCTL_DSP_STATUS: + return snd_hwdep_dsp_status(hw, argp); + case SNDRV_HWDEP_IOCTL_DSP_LOAD: + return snd_hwdep_dsp_load(hw, argp); + } + if (hw->ops.ioctl) + return hw->ops.ioctl(hw, file, cmd, arg); + return -ENOTTY; +} + +static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma) +{ + snd_hwdep_t *hw = file->private_data; + if (hw->ops.mmap) + return hw->ops.mmap(hw, file, vma); + return -ENXIO; +} + +static int snd_hwdep_control_ioctl(snd_card_t * card, snd_ctl_file_t * control, + unsigned int cmd, unsigned long arg) +{ + unsigned int tmp; + + tmp = card->number * SNDRV_MINOR_HWDEPS; + switch (cmd) { + case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE: + { + int device; + + if (get_user(device, (int __user *)arg)) + return -EFAULT; + device = device < 0 ? 0 : device + 1; + while (device < SNDRV_MINOR_HWDEPS) { + if (snd_hwdep_devices[tmp + device]) + break; + device++; + } + if (device >= SNDRV_MINOR_HWDEPS) + device = -1; + if (put_user(device, (int __user *)arg)) + return -EFAULT; + return 0; + } + case SNDRV_CTL_IOCTL_HWDEP_INFO: + { + snd_hwdep_info_t __user *info = (snd_hwdep_info_t __user *)arg; + int device; + snd_hwdep_t *hwdep; + + if (get_user(device, &info->device)) + return -EFAULT; + if (device < 0 || device >= SNDRV_MINOR_HWDEPS) + return -ENXIO; + hwdep = snd_hwdep_devices[tmp + device]; + if (hwdep == NULL) + return -ENXIO; + return snd_hwdep_info(hwdep, info); + } + } + return -ENOIOCTLCMD; +} + +#ifdef CONFIG_COMPAT +#include "hwdep_compat.c" +#else +#define snd_hwdep_ioctl_compat NULL +#endif + +/* + + */ + +static struct file_operations snd_hwdep_f_ops = +{ + .owner = THIS_MODULE, + .llseek = snd_hwdep_llseek, + .read = snd_hwdep_read, + .write = snd_hwdep_write, + .open = snd_hwdep_open, + .release = snd_hwdep_release, + .poll = snd_hwdep_poll, + .unlocked_ioctl = snd_hwdep_ioctl, + .compat_ioctl = snd_hwdep_ioctl_compat, + .mmap = snd_hwdep_mmap, +}; + +static snd_minor_t snd_hwdep_reg = +{ + .comment = "hardware dependent", + .f_ops = &snd_hwdep_f_ops, +}; + +/** + * snd_hwdep_new - create a new hwdep instance + * @card: the card instance + * @id: the id string + * @device: the device index (zero-based) + * @rhwdep: the pointer to store the new hwdep instance + * + * Creates a new hwdep instance with the given index on the card. + * The callbacks (hwdep->ops) must be set on the returned instance + * after this call manually by the caller. + * + * Returns zero if successful, or a negative error code on failure. + */ +int snd_hwdep_new(snd_card_t * card, char *id, int device, snd_hwdep_t ** rhwdep) +{ + snd_hwdep_t *hwdep; + int err; + static snd_device_ops_t ops = { + .dev_free = snd_hwdep_dev_free, + .dev_register = snd_hwdep_dev_register, + .dev_unregister = snd_hwdep_dev_unregister + }; + + snd_assert(rhwdep != NULL, return -EINVAL); + *rhwdep = NULL; + snd_assert(card != NULL, return -ENXIO); + hwdep = kcalloc(1, sizeof(*hwdep), GFP_KERNEL); + if (hwdep == NULL) + return -ENOMEM; + hwdep->card = card; + hwdep->device = device; + if (id) { + strlcpy(hwdep->id, id, sizeof(hwdep->id)); + } +#ifdef CONFIG_SND_OSSEMUL + hwdep->oss_type = -1; +#endif + if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) { + snd_hwdep_free(hwdep); + return err; + } + init_waitqueue_head(&hwdep->open_wait); + init_MUTEX(&hwdep->open_mutex); + *rhwdep = hwdep; + return 0; +} + +static int snd_hwdep_free(snd_hwdep_t *hwdep) +{ + snd_assert(hwdep != NULL, return -ENXIO); + if (hwdep->private_free) + hwdep->private_free(hwdep); + kfree(hwdep); + return 0; +} + +static int snd_hwdep_dev_free(snd_device_t *device) +{ + snd_hwdep_t *hwdep = device->device_data; + return snd_hwdep_free(hwdep); +} + +static int snd_hwdep_dev_register(snd_device_t *device) +{ + snd_hwdep_t *hwdep = device->device_data; + int idx, err; + char name[32]; + + down(®ister_mutex); + idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device; + if (snd_hwdep_devices[idx]) { + up(®ister_mutex); + return -EBUSY; + } + snd_hwdep_devices[idx] = hwdep; + sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device); + if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP, + hwdep->card, hwdep->device, + &snd_hwdep_reg, name)) < 0) { + snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n", + hwdep->card->number, hwdep->device); + snd_hwdep_devices[idx] = NULL; + up(®ister_mutex); + return err; + } +#ifdef CONFIG_SND_OSSEMUL + hwdep->ossreg = 0; + if (hwdep->oss_type >= 0) { + if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) { + snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n"); + } else { + if (snd_register_oss_device(hwdep->oss_type, + hwdep->card, hwdep->device, + &snd_hwdep_reg, hwdep->oss_dev) < 0) { + snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n", + hwdep->card->number, hwdep->device); + } else + hwdep->ossreg = 1; + } + } +#endif + up(®ister_mutex); + return 0; +} + +static int snd_hwdep_dev_unregister(snd_device_t *device) +{ + snd_hwdep_t *hwdep = device->device_data; + int idx; + + snd_assert(hwdep != NULL, return -ENXIO); + down(®ister_mutex); + idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device; + if (snd_hwdep_devices[idx] != hwdep) { + up(®ister_mutex); + return -EINVAL; + } +#ifdef CONFIG_SND_OSSEMUL + if (hwdep->ossreg) + snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device); +#endif + snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device); + snd_hwdep_devices[idx] = NULL; + up(®ister_mutex); + return snd_hwdep_free(hwdep); +} + +/* + * Info interface + */ + +static void snd_hwdep_proc_read(snd_info_entry_t *entry, + snd_info_buffer_t * buffer) +{ + int idx; + snd_hwdep_t *hwdep; + + down(®ister_mutex); + for (idx = 0; idx < SNDRV_CARDS * SNDRV_MINOR_HWDEPS; idx++) { + hwdep = snd_hwdep_devices[idx]; + if (hwdep == NULL) + continue; + snd_iprintf(buffer, "%02i-%02i: %s\n", + idx / SNDRV_MINOR_HWDEPS, + idx % SNDRV_MINOR_HWDEPS, + hwdep->name); + } + up(®ister_mutex); +} + +/* + * ENTRY functions + */ + +static snd_info_entry_t *snd_hwdep_proc_entry = NULL; + +static int __init alsa_hwdep_init(void) +{ + snd_info_entry_t *entry; + + memset(snd_hwdep_devices, 0, sizeof(snd_hwdep_devices)); + if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) { + entry->c.text.read_size = 512; + entry->c.text.read = snd_hwdep_proc_read; + if (snd_info_register(entry) < 0) { + snd_info_free_entry(entry); + entry = NULL; + } + } + snd_hwdep_proc_entry = entry; + snd_ctl_register_ioctl(snd_hwdep_control_ioctl); + snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl); + return 0; +} + +static void __exit alsa_hwdep_exit(void) +{ + snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl); + snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl); + if (snd_hwdep_proc_entry) { + snd_info_unregister(snd_hwdep_proc_entry); + snd_hwdep_proc_entry = NULL; + } +} + +module_init(alsa_hwdep_init) +module_exit(alsa_hwdep_exit) + +EXPORT_SYMBOL(snd_hwdep_new); 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