525 lines
13 KiB
C
525 lines
13 KiB
C
/*
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* Hardware dependent layer
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* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/driver.h>
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#include <linux/major.h>
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#include <linux/init.h>
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#include <linux/smp_lock.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include <sound/minors.h>
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#include <sound/hwdep.h>
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#include <sound/info.h>
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MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
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MODULE_DESCRIPTION("Hardware dependent layer");
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MODULE_LICENSE("GPL");
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static snd_hwdep_t *snd_hwdep_devices[SNDRV_CARDS * SNDRV_MINOR_HWDEPS];
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static DECLARE_MUTEX(register_mutex);
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static int snd_hwdep_free(snd_hwdep_t *hwdep);
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static int snd_hwdep_dev_free(snd_device_t *device);
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static int snd_hwdep_dev_register(snd_device_t *device);
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static int snd_hwdep_dev_unregister(snd_device_t *device);
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/*
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*/
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static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
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{
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snd_hwdep_t *hw = file->private_data;
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if (hw->ops.llseek)
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return hw->ops.llseek(hw, file, offset, orig);
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return -ENXIO;
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}
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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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snd_hwdep_t *hw = file->private_data;
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if (hw->ops.read)
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return hw->ops.read(hw, buf, count, offset);
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return -ENXIO;
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}
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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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snd_hwdep_t *hw = file->private_data;
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if (hw->ops.write)
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return hw->ops.write(hw, buf, count, offset);
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return -ENXIO;
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}
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static int snd_hwdep_open(struct inode *inode, struct file * file)
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{
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int major = imajor(inode);
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int cardnum;
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int device;
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snd_hwdep_t *hw;
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int err;
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wait_queue_t wait;
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switch (major) {
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case CONFIG_SND_MAJOR:
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cardnum = SNDRV_MINOR_CARD(iminor(inode));
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device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_HWDEP;
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break;
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#ifdef CONFIG_SND_OSSEMUL
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case SOUND_MAJOR:
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cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
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device = 0;
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break;
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#endif
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default:
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return -ENXIO;
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}
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cardnum %= SNDRV_CARDS;
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device %= SNDRV_MINOR_HWDEPS;
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hw = snd_hwdep_devices[(cardnum * SNDRV_MINOR_HWDEPS) + device];
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if (hw == NULL)
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return -ENODEV;
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if (!hw->ops.open)
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return -ENXIO;
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#ifdef CONFIG_SND_OSSEMUL
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if (major == SOUND_MAJOR && hw->oss_type < 0)
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return -ENXIO;
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#endif
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if (!try_module_get(hw->card->module))
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return -EFAULT;
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init_waitqueue_entry(&wait, current);
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add_wait_queue(&hw->open_wait, &wait);
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down(&hw->open_mutex);
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while (1) {
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if (hw->exclusive && hw->used > 0) {
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err = -EBUSY;
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break;
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}
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err = hw->ops.open(hw, file);
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if (err >= 0)
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break;
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if (err == -EAGAIN) {
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if (file->f_flags & O_NONBLOCK) {
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err = -EBUSY;
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break;
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}
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} else
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break;
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set_current_state(TASK_INTERRUPTIBLE);
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up(&hw->open_mutex);
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schedule();
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down(&hw->open_mutex);
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if (signal_pending(current)) {
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err = -ERESTARTSYS;
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break;
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}
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}
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remove_wait_queue(&hw->open_wait, &wait);
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if (err >= 0) {
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err = snd_card_file_add(hw->card, file);
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if (err >= 0) {
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file->private_data = hw;
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hw->used++;
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} else {
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if (hw->ops.release)
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hw->ops.release(hw, file);
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}
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}
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up(&hw->open_mutex);
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if (err < 0)
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module_put(hw->card->module);
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return err;
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}
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static int snd_hwdep_release(struct inode *inode, struct file * file)
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{
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int err = -ENXIO;
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snd_hwdep_t *hw = file->private_data;
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down(&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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wake_up(&hw->open_wait);
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}
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if (hw->used > 0)
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hw->used--;
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snd_card_file_remove(hw->card, file);
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up(&hw->open_mutex);
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module_put(hw->card->module);
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return err;
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}
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static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
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{
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snd_hwdep_t *hw = file->private_data;
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if (hw->ops.poll)
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return hw->ops.poll(hw, file, wait);
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return 0;
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}
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static int snd_hwdep_info(snd_hwdep_t *hw, snd_hwdep_info_t __user *_info)
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{
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snd_hwdep_info_t info;
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memset(&info, 0, sizeof(info));
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info.card = hw->card->number;
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strlcpy(info.id, hw->id, sizeof(info.id));
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strlcpy(info.name, hw->name, sizeof(info.name));
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info.iface = hw->iface;
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if (copy_to_user(_info, &info, sizeof(info)))
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return -EFAULT;
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return 0;
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}
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static int snd_hwdep_dsp_status(snd_hwdep_t *hw, snd_hwdep_dsp_status_t __user *_info)
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{
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snd_hwdep_dsp_status_t info;
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int err;
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if (! hw->ops.dsp_status)
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return -ENXIO;
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memset(&info, 0, sizeof(info));
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info.dsp_loaded = hw->dsp_loaded;
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if ((err = hw->ops.dsp_status(hw, &info)) < 0)
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return err;
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if (copy_to_user(_info, &info, sizeof(info)))
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return -EFAULT;
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return 0;
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}
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static int snd_hwdep_dsp_load(snd_hwdep_t *hw, snd_hwdep_dsp_image_t __user *_info)
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{
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snd_hwdep_dsp_image_t info;
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int err;
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if (! hw->ops.dsp_load)
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return -ENXIO;
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memset(&info, 0, sizeof(info));
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if (copy_from_user(&info, _info, sizeof(info)))
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return -EFAULT;
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/* check whether the dsp was already loaded */
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if (hw->dsp_loaded & (1 << info.index))
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return -EBUSY;
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if (!access_ok(VERIFY_READ, info.image, info.length))
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return -EFAULT;
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err = hw->ops.dsp_load(hw, &info);
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if (err < 0)
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return err;
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hw->dsp_loaded |= (1 << info.index);
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return 0;
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}
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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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snd_hwdep_t *hw = file->private_data;
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void __user *argp = (void __user *)arg;
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switch (cmd) {
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case SNDRV_HWDEP_IOCTL_PVERSION:
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return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
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case SNDRV_HWDEP_IOCTL_INFO:
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return snd_hwdep_info(hw, argp);
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case SNDRV_HWDEP_IOCTL_DSP_STATUS:
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return snd_hwdep_dsp_status(hw, argp);
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case SNDRV_HWDEP_IOCTL_DSP_LOAD:
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return snd_hwdep_dsp_load(hw, argp);
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}
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if (hw->ops.ioctl)
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return hw->ops.ioctl(hw, file, cmd, arg);
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return -ENOTTY;
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}
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static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
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{
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snd_hwdep_t *hw = file->private_data;
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if (hw->ops.mmap)
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return hw->ops.mmap(hw, file, vma);
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return -ENXIO;
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}
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static int snd_hwdep_control_ioctl(snd_card_t * card, snd_ctl_file_t * control,
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unsigned int cmd, unsigned long arg)
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{
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unsigned int tmp;
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tmp = card->number * SNDRV_MINOR_HWDEPS;
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switch (cmd) {
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case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
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{
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int device;
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if (get_user(device, (int __user *)arg))
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return -EFAULT;
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device = device < 0 ? 0 : device + 1;
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while (device < SNDRV_MINOR_HWDEPS) {
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if (snd_hwdep_devices[tmp + device])
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break;
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device++;
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}
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if (device >= SNDRV_MINOR_HWDEPS)
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device = -1;
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if (put_user(device, (int __user *)arg))
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return -EFAULT;
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return 0;
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}
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case SNDRV_CTL_IOCTL_HWDEP_INFO:
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{
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snd_hwdep_info_t __user *info = (snd_hwdep_info_t __user *)arg;
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int device;
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snd_hwdep_t *hwdep;
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if (get_user(device, &info->device))
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return -EFAULT;
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if (device < 0 || device >= SNDRV_MINOR_HWDEPS)
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return -ENXIO;
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hwdep = snd_hwdep_devices[tmp + device];
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if (hwdep == NULL)
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return -ENXIO;
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return snd_hwdep_info(hwdep, info);
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}
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}
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return -ENOIOCTLCMD;
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}
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#ifdef CONFIG_COMPAT
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#include "hwdep_compat.c"
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#else
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#define snd_hwdep_ioctl_compat NULL
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#endif
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/*
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*/
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static struct file_operations snd_hwdep_f_ops =
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{
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.owner = THIS_MODULE,
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.llseek = snd_hwdep_llseek,
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.read = snd_hwdep_read,
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.write = snd_hwdep_write,
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.open = snd_hwdep_open,
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.release = snd_hwdep_release,
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.poll = snd_hwdep_poll,
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.unlocked_ioctl = snd_hwdep_ioctl,
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.compat_ioctl = snd_hwdep_ioctl_compat,
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.mmap = snd_hwdep_mmap,
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};
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static snd_minor_t snd_hwdep_reg =
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{
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.comment = "hardware dependent",
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.f_ops = &snd_hwdep_f_ops,
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};
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/**
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* snd_hwdep_new - create a new hwdep instance
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* @card: the card instance
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* @id: the id string
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* @device: the device index (zero-based)
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* @rhwdep: the pointer to store the new hwdep instance
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*
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* Creates a new hwdep instance with the given index on the card.
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* The callbacks (hwdep->ops) must be set on the returned instance
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* after this call manually by the caller.
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*
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* Returns zero if successful, or a negative error code on failure.
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*/
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int snd_hwdep_new(snd_card_t * card, char *id, int device, snd_hwdep_t ** rhwdep)
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{
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snd_hwdep_t *hwdep;
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int err;
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static snd_device_ops_t ops = {
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.dev_free = snd_hwdep_dev_free,
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.dev_register = snd_hwdep_dev_register,
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.dev_unregister = snd_hwdep_dev_unregister
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};
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snd_assert(rhwdep != NULL, return -EINVAL);
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*rhwdep = NULL;
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snd_assert(card != NULL, return -ENXIO);
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hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
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if (hwdep == NULL)
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return -ENOMEM;
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hwdep->card = card;
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hwdep->device = device;
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if (id) {
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strlcpy(hwdep->id, id, sizeof(hwdep->id));
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}
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#ifdef CONFIG_SND_OSSEMUL
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hwdep->oss_type = -1;
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#endif
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if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
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snd_hwdep_free(hwdep);
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return err;
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}
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init_waitqueue_head(&hwdep->open_wait);
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init_MUTEX(&hwdep->open_mutex);
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*rhwdep = hwdep;
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return 0;
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}
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static int snd_hwdep_free(snd_hwdep_t *hwdep)
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{
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snd_assert(hwdep != NULL, return -ENXIO);
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if (hwdep->private_free)
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hwdep->private_free(hwdep);
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kfree(hwdep);
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return 0;
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}
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static int snd_hwdep_dev_free(snd_device_t *device)
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{
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snd_hwdep_t *hwdep = device->device_data;
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return snd_hwdep_free(hwdep);
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}
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static int snd_hwdep_dev_register(snd_device_t *device)
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{
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snd_hwdep_t *hwdep = device->device_data;
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int idx, err;
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char name[32];
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down(®ister_mutex);
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idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
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if (snd_hwdep_devices[idx]) {
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up(®ister_mutex);
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return -EBUSY;
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}
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snd_hwdep_devices[idx] = hwdep;
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sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
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if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
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hwdep->card, hwdep->device,
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&snd_hwdep_reg, name)) < 0) {
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snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
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hwdep->card->number, hwdep->device);
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snd_hwdep_devices[idx] = NULL;
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up(®ister_mutex);
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return err;
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}
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#ifdef CONFIG_SND_OSSEMUL
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hwdep->ossreg = 0;
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if (hwdep->oss_type >= 0) {
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if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) {
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snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n");
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} else {
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if (snd_register_oss_device(hwdep->oss_type,
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hwdep->card, hwdep->device,
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&snd_hwdep_reg, hwdep->oss_dev) < 0) {
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snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
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hwdep->card->number, hwdep->device);
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} else
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hwdep->ossreg = 1;
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}
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}
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#endif
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up(®ister_mutex);
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return 0;
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}
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static int snd_hwdep_dev_unregister(snd_device_t *device)
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{
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snd_hwdep_t *hwdep = device->device_data;
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int idx;
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snd_assert(hwdep != NULL, return -ENXIO);
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down(®ister_mutex);
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idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
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if (snd_hwdep_devices[idx] != hwdep) {
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up(®ister_mutex);
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return -EINVAL;
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}
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#ifdef CONFIG_SND_OSSEMUL
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if (hwdep->ossreg)
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snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
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#endif
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snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
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snd_hwdep_devices[idx] = NULL;
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up(®ister_mutex);
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return snd_hwdep_free(hwdep);
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}
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/*
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* Info interface
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*/
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static void snd_hwdep_proc_read(snd_info_entry_t *entry,
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snd_info_buffer_t * buffer)
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{
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int idx;
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snd_hwdep_t *hwdep;
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down(®ister_mutex);
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for (idx = 0; idx < SNDRV_CARDS * SNDRV_MINOR_HWDEPS; idx++) {
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hwdep = snd_hwdep_devices[idx];
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if (hwdep == NULL)
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continue;
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snd_iprintf(buffer, "%02i-%02i: %s\n",
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idx / SNDRV_MINOR_HWDEPS,
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idx % SNDRV_MINOR_HWDEPS,
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hwdep->name);
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}
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up(®ister_mutex);
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}
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/*
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* ENTRY functions
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*/
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static snd_info_entry_t *snd_hwdep_proc_entry = NULL;
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static int __init alsa_hwdep_init(void)
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{
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snd_info_entry_t *entry;
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memset(snd_hwdep_devices, 0, sizeof(snd_hwdep_devices));
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if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
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entry->c.text.read_size = 512;
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entry->c.text.read = snd_hwdep_proc_read;
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if (snd_info_register(entry) < 0) {
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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);
|