--- /dev/null
+/*
+ * Hardware dependent layer
+ * Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/major.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/mutex.h>
+#include <linux/module.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_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 unsigned int 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;
+ 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(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;
+ 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(struct snd_hwdep *hw,
+ struct snd_hwdep_dsp_image __user *_info)
+{
+ struct snd_hwdep_dsp_image 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)
+{
+ 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(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 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)
+ strlcpy(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_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;
+
+ if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
+ 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_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();
+ 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)
Code Review / kvmfornfv.git / blobdiff