diff options
Diffstat (limited to 'sound/core/control_compat.c')
-rw-r--r-- | sound/core/control_compat.c | 448 |
1 files changed, 448 insertions, 0 deletions
diff --git a/sound/core/control_compat.c b/sound/core/control_compat.c new file mode 100644 index 000000000..b9c0910fb --- /dev/null +++ b/sound/core/control_compat.c @@ -0,0 +1,448 @@ +/* + * compat ioctls for control API + * + * Copyright (c) by Takashi Iwai <tiwai@suse.de> + * + * 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 + */ + +/* this file included from control.c */ + +#include <linux/compat.h> +#include <linux/slab.h> + +struct snd_ctl_elem_list32 { + u32 offset; + u32 space; + u32 used; + u32 count; + u32 pids; + unsigned char reserved[50]; +} /* don't set packed attribute here */; + +static int snd_ctl_elem_list_compat(struct snd_card *card, + struct snd_ctl_elem_list32 __user *data32) +{ + struct snd_ctl_elem_list __user *data; + compat_caddr_t ptr; + int err; + + data = compat_alloc_user_space(sizeof(*data)); + + /* offset, space, used, count */ + if (copy_in_user(data, data32, 4 * sizeof(u32))) + return -EFAULT; + /* pids */ + if (get_user(ptr, &data32->pids) || + put_user(compat_ptr(ptr), &data->pids)) + return -EFAULT; + err = snd_ctl_elem_list(card, data); + if (err < 0) + return err; + /* copy the result */ + if (copy_in_user(data32, data, 4 * sizeof(u32))) + return -EFAULT; + return 0; +} + +/* + * control element info + * it uses union, so the things are not easy.. + */ + +struct snd_ctl_elem_info32 { + struct snd_ctl_elem_id id; // the size of struct is same + s32 type; + u32 access; + u32 count; + s32 owner; + union { + struct { + s32 min; + s32 max; + s32 step; + } integer; + struct { + u64 min; + u64 max; + u64 step; + } integer64; + struct { + u32 items; + u32 item; + char name[64]; + u64 names_ptr; + u32 names_length; + } enumerated; + unsigned char reserved[128]; + } value; + unsigned char reserved[64]; +} __attribute__((packed)); + +static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl, + struct snd_ctl_elem_info32 __user *data32) +{ + struct snd_ctl_elem_info *data; + int err; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (! data) + return -ENOMEM; + + err = -EFAULT; + /* copy id */ + if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) + goto error; + /* we need to copy the item index. + * hope this doesn't break anything.. + */ + if (get_user(data->value.enumerated.item, &data32->value.enumerated.item)) + goto error; + + snd_power_lock(ctl->card); + err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); + if (err >= 0) + err = snd_ctl_elem_info(ctl, data); + snd_power_unlock(ctl->card); + + if (err < 0) + goto error; + /* restore info to 32bit */ + err = -EFAULT; + /* id, type, access, count */ + if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) || + copy_to_user(&data32->type, &data->type, 3 * sizeof(u32))) + goto error; + if (put_user(data->owner, &data32->owner)) + goto error; + switch (data->type) { + case SNDRV_CTL_ELEM_TYPE_BOOLEAN: + case SNDRV_CTL_ELEM_TYPE_INTEGER: + if (put_user(data->value.integer.min, &data32->value.integer.min) || + put_user(data->value.integer.max, &data32->value.integer.max) || + put_user(data->value.integer.step, &data32->value.integer.step)) + goto error; + break; + case SNDRV_CTL_ELEM_TYPE_INTEGER64: + if (copy_to_user(&data32->value.integer64, + &data->value.integer64, + sizeof(data->value.integer64))) + goto error; + break; + case SNDRV_CTL_ELEM_TYPE_ENUMERATED: + if (copy_to_user(&data32->value.enumerated, + &data->value.enumerated, + sizeof(data->value.enumerated))) + goto error; + break; + default: + break; + } + err = 0; + error: + kfree(data); + return err; +} + +/* read / write */ +struct snd_ctl_elem_value32 { + struct snd_ctl_elem_id id; + unsigned int indirect; /* bit-field causes misalignment */ + union { + s32 integer[128]; + unsigned char data[512]; +#ifndef CONFIG_X86_64 + s64 integer64[64]; +#endif + } value; + unsigned char reserved[128]; +}; + + +/* get the value type and count of the control */ +static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id, + int *countp) +{ + struct snd_kcontrol *kctl; + struct snd_ctl_elem_info *info; + int err; + + down_read(&card->controls_rwsem); + kctl = snd_ctl_find_id(card, id); + if (! kctl) { + up_read(&card->controls_rwsem); + return -ENXIO; + } + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (info == NULL) { + up_read(&card->controls_rwsem); + return -ENOMEM; + } + info->id = *id; + err = kctl->info(kctl, info); + up_read(&card->controls_rwsem); + if (err >= 0) { + err = info->type; + *countp = info->count; + } + kfree(info); + return err; +} + +static int get_elem_size(int type, int count) +{ + switch (type) { + case SNDRV_CTL_ELEM_TYPE_INTEGER64: + return sizeof(s64) * count; + case SNDRV_CTL_ELEM_TYPE_ENUMERATED: + return sizeof(int) * count; + case SNDRV_CTL_ELEM_TYPE_BYTES: + return 512; + case SNDRV_CTL_ELEM_TYPE_IEC958: + return sizeof(struct snd_aes_iec958); + default: + return -1; + } +} + +static int copy_ctl_value_from_user(struct snd_card *card, + struct snd_ctl_elem_value *data, + struct snd_ctl_elem_value32 __user *data32, + int *typep, int *countp) +{ + int i, type, size; + int uninitialized_var(count); + unsigned int indirect; + + if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) + return -EFAULT; + if (get_user(indirect, &data32->indirect)) + return -EFAULT; + if (indirect) + return -EINVAL; + type = get_ctl_type(card, &data->id, &count); + if (type < 0) + return type; + + if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || + type == SNDRV_CTL_ELEM_TYPE_INTEGER) { + for (i = 0; i < count; i++) { + int val; + if (get_user(val, &data32->value.integer[i])) + return -EFAULT; + data->value.integer.value[i] = val; + } + } else { + size = get_elem_size(type, count); + if (size < 0) { + dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type); + return -EINVAL; + } + if (copy_from_user(data->value.bytes.data, + data32->value.data, size)) + return -EFAULT; + } + + *typep = type; + *countp = count; + return 0; +} + +/* restore the value to 32bit */ +static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32, + struct snd_ctl_elem_value *data, + int type, int count) +{ + int i, size; + + if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || + type == SNDRV_CTL_ELEM_TYPE_INTEGER) { + for (i = 0; i < count; i++) { + int val; + val = data->value.integer.value[i]; + if (put_user(val, &data32->value.integer[i])) + return -EFAULT; + } + } else { + size = get_elem_size(type, count); + if (copy_to_user(data32->value.data, + data->value.bytes.data, size)) + return -EFAULT; + } + return 0; +} + +static int snd_ctl_elem_read_user_compat(struct snd_card *card, + struct snd_ctl_elem_value32 __user *data32) +{ + struct snd_ctl_elem_value *data; + int err, type, count; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (data == NULL) + return -ENOMEM; + + if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0) + goto error; + + snd_power_lock(card); + err = snd_power_wait(card, SNDRV_CTL_POWER_D0); + if (err >= 0) + err = snd_ctl_elem_read(card, data); + snd_power_unlock(card); + if (err >= 0) + err = copy_ctl_value_to_user(data32, data, type, count); + error: + kfree(data); + return err; +} + +static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file, + struct snd_ctl_elem_value32 __user *data32) +{ + struct snd_ctl_elem_value *data; + struct snd_card *card = file->card; + int err, type, count; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (data == NULL) + return -ENOMEM; + + if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0) + goto error; + + snd_power_lock(card); + err = snd_power_wait(card, SNDRV_CTL_POWER_D0); + if (err >= 0) + err = snd_ctl_elem_write(card, file, data); + snd_power_unlock(card); + if (err >= 0) + err = copy_ctl_value_to_user(data32, data, type, count); + error: + kfree(data); + return err; +} + +/* add or replace a user control */ +static int snd_ctl_elem_add_compat(struct snd_ctl_file *file, + struct snd_ctl_elem_info32 __user *data32, + int replace) +{ + struct snd_ctl_elem_info *data; + int err; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (! data) + return -ENOMEM; + + err = -EFAULT; + /* id, type, access, count */ \ + if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) || + copy_from_user(&data->type, &data32->type, 3 * sizeof(u32))) + goto error; + if (get_user(data->owner, &data32->owner) || + get_user(data->type, &data32->type)) + goto error; + switch (data->type) { + case SNDRV_CTL_ELEM_TYPE_BOOLEAN: + case SNDRV_CTL_ELEM_TYPE_INTEGER: + if (get_user(data->value.integer.min, &data32->value.integer.min) || + get_user(data->value.integer.max, &data32->value.integer.max) || + get_user(data->value.integer.step, &data32->value.integer.step)) + goto error; + break; + case SNDRV_CTL_ELEM_TYPE_INTEGER64: + if (copy_from_user(&data->value.integer64, + &data32->value.integer64, + sizeof(data->value.integer64))) + goto error; + break; + case SNDRV_CTL_ELEM_TYPE_ENUMERATED: + if (copy_from_user(&data->value.enumerated, + &data32->value.enumerated, + sizeof(data->value.enumerated))) + goto error; + data->value.enumerated.names_ptr = + (uintptr_t)compat_ptr(data->value.enumerated.names_ptr); + break; + default: + break; + } + err = snd_ctl_elem_add(file, data, replace); + error: + kfree(data); + return err; +} + +enum { + SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32), + SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32), + SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32), + SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32), + SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32), + SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32), +}; + +static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct snd_ctl_file *ctl; + struct snd_kctl_ioctl *p; + void __user *argp = compat_ptr(arg); + int err; + + ctl = file->private_data; + if (snd_BUG_ON(!ctl || !ctl->card)) + return -ENXIO; + + switch (cmd) { + case SNDRV_CTL_IOCTL_PVERSION: + case SNDRV_CTL_IOCTL_CARD_INFO: + case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: + case SNDRV_CTL_IOCTL_POWER: + case SNDRV_CTL_IOCTL_POWER_STATE: + case SNDRV_CTL_IOCTL_ELEM_LOCK: + case SNDRV_CTL_IOCTL_ELEM_UNLOCK: + case SNDRV_CTL_IOCTL_ELEM_REMOVE: + case SNDRV_CTL_IOCTL_TLV_READ: + case SNDRV_CTL_IOCTL_TLV_WRITE: + case SNDRV_CTL_IOCTL_TLV_COMMAND: + return snd_ctl_ioctl(file, cmd, (unsigned long)argp); + case SNDRV_CTL_IOCTL_ELEM_LIST32: + return snd_ctl_elem_list_compat(ctl->card, argp); + case SNDRV_CTL_IOCTL_ELEM_INFO32: + return snd_ctl_elem_info_compat(ctl, argp); + case SNDRV_CTL_IOCTL_ELEM_READ32: + return snd_ctl_elem_read_user_compat(ctl->card, argp); + case SNDRV_CTL_IOCTL_ELEM_WRITE32: + return snd_ctl_elem_write_user_compat(ctl, argp); + case SNDRV_CTL_IOCTL_ELEM_ADD32: + return snd_ctl_elem_add_compat(ctl, argp, 0); + case SNDRV_CTL_IOCTL_ELEM_REPLACE32: + return snd_ctl_elem_add_compat(ctl, argp, 1); + } + + down_read(&snd_ioctl_rwsem); + list_for_each_entry(p, &snd_control_compat_ioctls, list) { + if (p->fioctl) { + err = p->fioctl(ctl->card, ctl, cmd, arg); + if (err != -ENOIOCTLCMD) { + up_read(&snd_ioctl_rwsem); + return err; + } + } + } + up_read(&snd_ioctl_rwsem); + return -ENOIOCTLCMD; +} |