/* * 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);