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sound/core/hwdep.c
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/* * Hardware dependent layer |
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
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* * * 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 * */ |
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#include <linux/major.h> #include <linux/init.h> |
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#include <linux/slab.h> #include <linux/time.h> |
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#include <linux/mutex.h> |
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#include <sound/core.h> #include <sound/control.h> #include <sound/minors.h> #include <sound/hwdep.h> #include <sound/info.h> |
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); |
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MODULE_DESCRIPTION("Hardware dependent layer"); MODULE_LICENSE("GPL"); |
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static LIST_HEAD(snd_hwdep_devices); |
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static DEFINE_MUTEX(register_mutex); |
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|
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static int snd_hwdep_free(struct snd_hwdep *hwdep); static int snd_hwdep_dev_free(struct snd_device *device); static int snd_hwdep_dev_register(struct snd_device *device); |
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static int snd_hwdep_dev_disconnect(struct snd_device *device); |
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static struct snd_hwdep *snd_hwdep_search(struct snd_card *card, int device) { |
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struct snd_hwdep *hwdep; |
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list_for_each_entry(hwdep, &snd_hwdep_devices, list) |
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if (hwdep->card == card && hwdep->device == device) return hwdep; |
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return NULL; } |
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static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig) { |
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struct snd_hwdep *hw = file->private_data; |
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if (hw->ops.llseek) return hw->ops.llseek(hw, file, offset, orig); return -ENXIO; } |
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static ssize_t snd_hwdep_read(struct file * file, char __user *buf, size_t count, loff_t *offset) |
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{ |
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struct snd_hwdep *hw = file->private_data; |
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if (hw->ops.read) return hw->ops.read(hw, buf, count, offset); return -ENXIO; } |
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static ssize_t snd_hwdep_write(struct file * file, const char __user *buf, size_t count, loff_t *offset) |
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{ |
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struct snd_hwdep *hw = file->private_data; |
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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); |
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struct snd_hwdep *hw; |
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int err; wait_queue_t wait; |
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if (major == snd_major) { |
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hw = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_HWDEP); |
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#ifdef CONFIG_SND_OSSEMUL |
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} else if (major == SOUND_MAJOR) { |
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hw = snd_lookup_oss_minor_data(iminor(inode), SNDRV_OSS_DEVICE_TYPE_DMFM); |
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#endif |
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} else |
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return -ENXIO; |
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if (hw == NULL) return -ENODEV; if (!hw->ops.open) return -ENXIO; |
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if (!try_module_get(hw->card->module)) return -EFAULT; init_waitqueue_entry(&wait, current); add_wait_queue(&hw->open_wait, &wait); |
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mutex_lock(&hw->open_mutex); |
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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); |
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mutex_unlock(&hw->open_mutex); |
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schedule(); |
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mutex_lock(&hw->open_mutex); |
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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); } } |
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mutex_unlock(&hw->open_mutex); |
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if (err < 0) module_put(hw->card->module); return err; } static int snd_hwdep_release(struct inode *inode, struct file * file) { int err = -ENXIO; |
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struct snd_hwdep *hw = file->private_data; |
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struct module *mod = hw->card->module; |
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|
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mutex_lock(&hw->open_mutex); |
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if (hw->ops.release) |
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err = hw->ops.release(hw, file); |
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if (hw->used > 0) hw->used--; |
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mutex_unlock(&hw->open_mutex); |
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wake_up(&hw->open_wait); snd_card_file_remove(hw->card, file); |
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module_put(mod); |
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return err; } static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait) { |
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struct snd_hwdep *hw = file->private_data; |
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if (hw->ops.poll) return hw->ops.poll(hw, file, wait); return 0; } |
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static int snd_hwdep_info(struct snd_hwdep *hw, struct snd_hwdep_info __user *_info) |
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{ |
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struct snd_hwdep_info info; |
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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; } |
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static int snd_hwdep_dsp_status(struct snd_hwdep *hw, struct snd_hwdep_dsp_status __user *_info) |
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{ |
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struct snd_hwdep_dsp_status info; |
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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; } |
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static int snd_hwdep_dsp_load(struct snd_hwdep *hw, struct snd_hwdep_dsp_image __user *_info) |
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{ |
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struct snd_hwdep_dsp_image info; |
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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; } |
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static long snd_hwdep_ioctl(struct file * file, unsigned int cmd, unsigned long arg) |
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{ |
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struct snd_hwdep *hw = file->private_data; |
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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) { |
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struct snd_hwdep *hw = file->private_data; |
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if (hw->ops.mmap) return hw->ops.mmap(hw, file, vma); return -ENXIO; } |
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static int snd_hwdep_control_ioctl(struct snd_card *card, struct snd_ctl_file * control, |
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unsigned int cmd, unsigned long arg) { |
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switch (cmd) { case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE: { int device; if (get_user(device, (int __user *)arg)) return -EFAULT; |
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mutex_lock(®ister_mutex); |
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device = device < 0 ? 0 : device + 1; while (device < SNDRV_MINOR_HWDEPS) { |
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if (snd_hwdep_search(card, device)) |
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break; device++; } if (device >= SNDRV_MINOR_HWDEPS) device = -1; |
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mutex_unlock(®ister_mutex); |
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if (put_user(device, (int __user *)arg)) return -EFAULT; return 0; } case SNDRV_CTL_IOCTL_HWDEP_INFO: { |
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struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg; |
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int device, err; |
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struct snd_hwdep *hwdep; |
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if (get_user(device, &info->device)) return -EFAULT; |
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mutex_lock(®ister_mutex); |
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hwdep = snd_hwdep_search(card, device); if (hwdep) err = snd_hwdep_info(hwdep, info); else err = -ENXIO; |
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mutex_unlock(®ister_mutex); |
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return err; |
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} } return -ENOIOCTLCMD; } #ifdef CONFIG_COMPAT #include "hwdep_compat.c" #else #define snd_hwdep_ioctl_compat NULL #endif /* */ |
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static const struct file_operations snd_hwdep_f_ops = |
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{ .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, }; |
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/** * 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. */ |
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int snd_hwdep_new(struct snd_card *card, char *id, int device, struct snd_hwdep **rhwdep) |
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{ |
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struct snd_hwdep *hwdep; |
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int err; |
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static struct snd_device_ops ops = { |
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.dev_free = snd_hwdep_dev_free, .dev_register = snd_hwdep_dev_register, |
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.dev_disconnect = snd_hwdep_dev_disconnect, |
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}; |
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if (snd_BUG_ON(!card)) return -ENXIO; if (rhwdep) *rhwdep = NULL; |
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hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL); |
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if (hwdep == NULL) { snd_printk(KERN_ERR "hwdep: cannot allocate "); |
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return -ENOMEM; |
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} |
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hwdep->card = card; hwdep->device = device; |
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if (id) |
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strlcpy(hwdep->id, id, sizeof(hwdep->id)); |
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#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); |
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mutex_init(&hwdep->open_mutex); |
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if (rhwdep) *rhwdep = hwdep; |
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return 0; } |
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static int snd_hwdep_free(struct snd_hwdep *hwdep) |
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{ |
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if (!hwdep) return 0; |
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if (hwdep->private_free) hwdep->private_free(hwdep); kfree(hwdep); return 0; } |
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static int snd_hwdep_dev_free(struct snd_device *device) |
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{ |
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struct snd_hwdep *hwdep = device->device_data; |
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return snd_hwdep_free(hwdep); } |
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static int snd_hwdep_dev_register(struct snd_device *device) |
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{ |
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struct snd_hwdep *hwdep = device->device_data; |
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int err; |
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char name[32]; |
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mutex_lock(®ister_mutex); |
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if (snd_hwdep_search(hwdep->card, hwdep->device)) { |
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mutex_unlock(®ister_mutex); |
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return -EBUSY; } |
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list_add_tail(&hwdep->list, &snd_hwdep_devices); |
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sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device); if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device, |
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&snd_hwdep_f_ops, hwdep, name)) < 0) { |
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snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i ", hwdep->card->number, hwdep->device); |
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list_del(&hwdep->list); |
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mutex_unlock(®ister_mutex); |
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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! "); } else { if (snd_register_oss_device(hwdep->oss_type, hwdep->card, hwdep->device, |
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&snd_hwdep_f_ops, hwdep, |
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hwdep->oss_dev) < 0) { |
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snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i ", hwdep->card->number, hwdep->device); } else hwdep->ossreg = 1; } } #endif |
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mutex_unlock(®ister_mutex); |
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return 0; } |
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static int snd_hwdep_dev_disconnect(struct snd_device *device) |
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{ |
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struct snd_hwdep *hwdep = device->device_data; |
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if (snd_BUG_ON(!hwdep)) return -ENXIO; |
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mutex_lock(®ister_mutex); |
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if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) { |
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mutex_unlock(®ister_mutex); |
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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); |
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list_del_init(&hwdep->list); |
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mutex_unlock(®ister_mutex); |
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return 0; |
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} |
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#ifdef CONFIG_PROC_FS |
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/* * Info interface */ |
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static void snd_hwdep_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) |
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{ |
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struct snd_hwdep *hwdep; |
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|
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mutex_lock(®ister_mutex); |
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list_for_each_entry(hwdep, &snd_hwdep_devices, list) |
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snd_iprintf(buffer, "%02i-%02i: %s ", |
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hwdep->card->number, hwdep->device, hwdep->name); |
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mutex_unlock(®ister_mutex); |
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} |
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static struct snd_info_entry *snd_hwdep_proc_entry; |
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|
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static void __init snd_hwdep_proc_init(void) |
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{ |
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struct snd_info_entry *entry; |
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|
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if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) { |
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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; |
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} static void __exit snd_hwdep_proc_done(void) { |
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snd_info_free_entry(snd_hwdep_proc_entry); |
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} #else /* !CONFIG_PROC_FS */ #define snd_hwdep_proc_init() #define snd_hwdep_proc_done() #endif /* CONFIG_PROC_FS */ /* * ENTRY functions */ static int __init alsa_hwdep_init(void) { snd_hwdep_proc_init(); |
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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); |
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snd_hwdep_proc_done(); |
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} module_init(alsa_hwdep_init) module_exit(alsa_hwdep_exit) EXPORT_SYMBOL(snd_hwdep_new); |