diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /sound/core/hwdep.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sound/core/hwdep.c')
-rw-r--r-- | sound/core/hwdep.c | 545 |
1 files changed, 545 insertions, 0 deletions
diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c new file mode 100644 index 000000000..e95fa275c --- /dev/null +++ b/sound/core/hwdep.c @@ -0,0 +1,545 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Hardware dependent layer + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + */ + +#include <linux/major.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/time.h> +#include <linux/mutex.h> +#include <linux/module.h> +#include <linux/sched/signal.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@perex.cz>"); +MODULE_DESCRIPTION("Hardware dependent layer"); +MODULE_LICENSE("GPL"); + +static LIST_HEAD(snd_hwdep_devices); +static DEFINE_MUTEX(register_mutex); + +static int snd_hwdep_dev_free(struct snd_device *device); +static int snd_hwdep_dev_register(struct snd_device *device); +static int snd_hwdep_dev_disconnect(struct snd_device *device); + + +static struct snd_hwdep *snd_hwdep_search(struct snd_card *card, int device) +{ + struct snd_hwdep *hwdep; + + list_for_each_entry(hwdep, &snd_hwdep_devices, list) + if (hwdep->card == card && hwdep->device == device) + return hwdep; + return NULL; +} + +static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig) +{ + struct snd_hwdep *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) +{ + struct snd_hwdep *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) +{ + struct snd_hwdep *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); + struct snd_hwdep *hw; + int err; + wait_queue_entry_t wait; + + if (major == snd_major) { + hw = snd_lookup_minor_data(iminor(inode), + SNDRV_DEVICE_TYPE_HWDEP); +#ifdef CONFIG_SND_OSSEMUL + } else if (major == SOUND_MAJOR) { + hw = snd_lookup_oss_minor_data(iminor(inode), + SNDRV_OSS_DEVICE_TYPE_DMFM); +#endif + } else + return -ENXIO; + if (hw == NULL) + return -ENODEV; + + if (!try_module_get(hw->card->module)) { + snd_card_unref(hw->card); + return -EFAULT; + } + + init_waitqueue_entry(&wait, current); + add_wait_queue(&hw->open_wait, &wait); + mutex_lock(&hw->open_mutex); + while (1) { + if (hw->exclusive && hw->used > 0) { + err = -EBUSY; + break; + } + if (!hw->ops.open) { + err = 0; + 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); + mutex_unlock(&hw->open_mutex); + schedule(); + mutex_lock(&hw->open_mutex); + if (hw->card->shutdown) { + err = -ENODEV; + break; + } + 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); + } + } + mutex_unlock(&hw->open_mutex); + if (err < 0) + module_put(hw->card->module); + snd_card_unref(hw->card); + return err; +} + +static int snd_hwdep_release(struct inode *inode, struct file * file) +{ + int err = 0; + struct snd_hwdep *hw = file->private_data; + struct module *mod = hw->card->module; + + mutex_lock(&hw->open_mutex); + if (hw->ops.release) + err = hw->ops.release(hw, file); + if (hw->used > 0) + hw->used--; + mutex_unlock(&hw->open_mutex); + wake_up(&hw->open_wait); + + snd_card_file_remove(hw->card, file); + module_put(mod); + return err; +} + +static __poll_t snd_hwdep_poll(struct file * file, poll_table * wait) +{ + struct snd_hwdep *hw = file->private_data; + if (hw->ops.poll) + return hw->ops.poll(hw, file, wait); + return 0; +} + +static int snd_hwdep_info(struct snd_hwdep *hw, + struct snd_hwdep_info __user *_info) +{ + struct snd_hwdep_info info; + + memset(&info, 0, sizeof(info)); + info.card = hw->card->number; + strscpy(info.id, hw->id, sizeof(info.id)); + strscpy(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(struct snd_hwdep *hw, + struct snd_hwdep_dsp_status __user *_info) +{ + struct snd_hwdep_dsp_status info; + int err; + + if (! hw->ops.dsp_status) + return -ENXIO; + memset(&info, 0, sizeof(info)); + info.dsp_loaded = hw->dsp_loaded; + err = hw->ops.dsp_status(hw, &info); + if (err < 0) + return err; + if (copy_to_user(_info, &info, sizeof(info))) + return -EFAULT; + return 0; +} + +static int snd_hwdep_dsp_load(struct snd_hwdep *hw, + struct snd_hwdep_dsp_image *info) +{ + int err; + + if (! hw->ops.dsp_load) + return -ENXIO; + if (info->index >= 32) + return -EINVAL; + /* check whether the dsp was already loaded */ + if (hw->dsp_loaded & (1u << info->index)) + return -EBUSY; + err = hw->ops.dsp_load(hw, info); + if (err < 0) + return err; + hw->dsp_loaded |= (1u << info->index); + return 0; +} + +static int snd_hwdep_dsp_load_user(struct snd_hwdep *hw, + struct snd_hwdep_dsp_image __user *_info) +{ + struct snd_hwdep_dsp_image info = {}; + + if (copy_from_user(&info, _info, sizeof(info))) + return -EFAULT; + return snd_hwdep_dsp_load(hw, &info); +} + + +static long snd_hwdep_ioctl(struct file * file, unsigned int cmd, + unsigned long arg) +{ + struct snd_hwdep *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_user(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) +{ + struct snd_hwdep *hw = file->private_data; + if (hw->ops.mmap) + return hw->ops.mmap(hw, file, vma); + return -ENXIO; +} + +static int snd_hwdep_control_ioctl(struct snd_card *card, + struct snd_ctl_file * control, + unsigned int cmd, unsigned long arg) +{ + switch (cmd) { + case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE: + { + int device; + + if (get_user(device, (int __user *)arg)) + return -EFAULT; + mutex_lock(®ister_mutex); + + if (device < 0) + device = 0; + else if (device < SNDRV_MINOR_HWDEPS) + device++; + else + device = SNDRV_MINOR_HWDEPS; + + while (device < SNDRV_MINOR_HWDEPS) { + if (snd_hwdep_search(card, device)) + break; + device++; + } + if (device >= SNDRV_MINOR_HWDEPS) + device = -1; + mutex_unlock(®ister_mutex); + if (put_user(device, (int __user *)arg)) + return -EFAULT; + return 0; + } + case SNDRV_CTL_IOCTL_HWDEP_INFO: + { + struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg; + int device, err; + struct snd_hwdep *hwdep; + + if (get_user(device, &info->device)) + return -EFAULT; + mutex_lock(®ister_mutex); + hwdep = snd_hwdep_search(card, device); + if (hwdep) + err = snd_hwdep_info(hwdep, info); + else + err = -ENXIO; + mutex_unlock(®ister_mutex); + return err; + } + } + return -ENOIOCTLCMD; +} + +#ifdef CONFIG_COMPAT +#include "hwdep_compat.c" +#else +#define snd_hwdep_ioctl_compat NULL +#endif + +/* + + */ + +static const 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 void release_hwdep_device(struct device *dev) +{ + kfree(container_of(dev, struct snd_hwdep, dev)); +} + +/** + * 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. + * + * Return: Zero if successful, or a negative error code on failure. + */ +int snd_hwdep_new(struct snd_card *card, char *id, int device, + struct snd_hwdep **rhwdep) +{ + struct snd_hwdep *hwdep; + int err; + static const struct snd_device_ops ops = { + .dev_free = snd_hwdep_dev_free, + .dev_register = snd_hwdep_dev_register, + .dev_disconnect = snd_hwdep_dev_disconnect, + }; + + if (snd_BUG_ON(!card)) + return -ENXIO; + if (rhwdep) + *rhwdep = NULL; + hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL); + if (!hwdep) + return -ENOMEM; + + init_waitqueue_head(&hwdep->open_wait); + mutex_init(&hwdep->open_mutex); + hwdep->card = card; + hwdep->device = device; + if (id) + strscpy(hwdep->id, id, sizeof(hwdep->id)); + + snd_device_initialize(&hwdep->dev, card); + hwdep->dev.release = release_hwdep_device; + dev_set_name(&hwdep->dev, "hwC%iD%i", card->number, device); +#ifdef CONFIG_SND_OSSEMUL + hwdep->oss_type = -1; +#endif + + err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops); + if (err < 0) { + put_device(&hwdep->dev); + return err; + } + + if (rhwdep) + *rhwdep = hwdep; + return 0; +} +EXPORT_SYMBOL(snd_hwdep_new); + +static int snd_hwdep_dev_free(struct snd_device *device) +{ + struct snd_hwdep *hwdep = device->device_data; + if (!hwdep) + return 0; + if (hwdep->private_free) + hwdep->private_free(hwdep); + put_device(&hwdep->dev); + return 0; +} + +static int snd_hwdep_dev_register(struct snd_device *device) +{ + struct snd_hwdep *hwdep = device->device_data; + struct snd_card *card = hwdep->card; + int err; + + mutex_lock(®ister_mutex); + if (snd_hwdep_search(card, hwdep->device)) { + mutex_unlock(®ister_mutex); + return -EBUSY; + } + list_add_tail(&hwdep->list, &snd_hwdep_devices); + err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP, + hwdep->card, hwdep->device, + &snd_hwdep_f_ops, hwdep, &hwdep->dev); + if (err < 0) { + dev_err(&hwdep->dev, "unable to register\n"); + list_del(&hwdep->list); + mutex_unlock(®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) + dev_warn(&hwdep->dev, + "only hwdep device 0 can be registered as OSS direct FM device!\n"); + else if (snd_register_oss_device(hwdep->oss_type, + card, hwdep->device, + &snd_hwdep_f_ops, hwdep) < 0) + dev_warn(&hwdep->dev, + "unable to register OSS compatibility device\n"); + else + hwdep->ossreg = 1; + } +#endif + mutex_unlock(®ister_mutex); + return 0; +} + +static int snd_hwdep_dev_disconnect(struct snd_device *device) +{ + struct snd_hwdep *hwdep = device->device_data; + + if (snd_BUG_ON(!hwdep)) + return -ENXIO; + mutex_lock(®ister_mutex); + if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) { + mutex_unlock(®ister_mutex); + return -EINVAL; + } + mutex_lock(&hwdep->open_mutex); + wake_up(&hwdep->open_wait); +#ifdef CONFIG_SND_OSSEMUL + if (hwdep->ossreg) + snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device); +#endif + snd_unregister_device(&hwdep->dev); + list_del_init(&hwdep->list); + mutex_unlock(&hwdep->open_mutex); + mutex_unlock(®ister_mutex); + return 0; +} + +#ifdef CONFIG_SND_PROC_FS +/* + * Info interface + */ + +static void snd_hwdep_proc_read(struct snd_info_entry *entry, + struct snd_info_buffer *buffer) +{ + struct snd_hwdep *hwdep; + + mutex_lock(®ister_mutex); + list_for_each_entry(hwdep, &snd_hwdep_devices, list) + snd_iprintf(buffer, "%02i-%02i: %s\n", + hwdep->card->number, hwdep->device, hwdep->name); + mutex_unlock(®ister_mutex); +} + +static struct snd_info_entry *snd_hwdep_proc_entry; + +static void __init snd_hwdep_proc_init(void) +{ + struct snd_info_entry *entry; + + entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL); + if (entry) { + 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; +} + +static void __exit snd_hwdep_proc_done(void) +{ + snd_info_free_entry(snd_hwdep_proc_entry); +} +#else /* !CONFIG_SND_PROC_FS */ +#define snd_hwdep_proc_init() +#define snd_hwdep_proc_done() +#endif /* CONFIG_SND_PROC_FS */ + + +/* + * ENTRY functions + */ + +static int __init alsa_hwdep_init(void) +{ + snd_hwdep_proc_init(); + 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); + snd_hwdep_proc_done(); +} + +module_init(alsa_hwdep_init) +module_exit(alsa_hwdep_exit) |