1 files changed, 412 insertions, 0 deletions

diff --git a/sound/core/control_compat.c b/sound/core/control_compat.c
new file mode 100644
index 00000000000..7fdabea4bfc
--- /dev/null
+++ b/sound/core/control_compat.c
@@ -0,0 +1,412 @@
+/*
+ * 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>
+
+struct sndrv_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(snd_card_t *card, struct sndrv_ctl_elem_list32 __user *data32)
+{
+	struct sndrv_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 sndrv_ctl_elem_info32 {
+	struct sndrv_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];
+		} enumerated;
+		unsigned char reserved[128];
+	} value;
+	unsigned char reserved[64];
+} __attribute__((packed));
+
+static int snd_ctl_elem_info_compat(snd_ctl_file_t *ctl, struct sndrv_ctl_elem_info32 __user *data32)
+{
+	struct sndrv_ctl_elem_info *data;
+	int err;
+
+	data = kcalloc(1, 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;
+	err = snd_ctl_elem_info(ctl, data);
+	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 sndrv_ctl_elem_value32 {
+	struct sndrv_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(snd_card_t *card, snd_ctl_elem_id_t *id, int *countp)
+{
+	snd_kcontrol_t *kctl;
+	snd_ctl_elem_info_t 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.id = *id;
+	err = kctl->info(kctl, &info);
+	up_read(&card->controls_rwsem);
+	if (err >= 0) {
+		err = info.type;
+		*countp = info.count;
+	}
+	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 sndrv_aes_iec958);
+	default:
+		return -1;
+	}
+}
+
+static int copy_ctl_value_from_user(snd_card_t *card,
+				    struct sndrv_ctl_elem_value *data,
+				    struct sndrv_ctl_elem_value32 __user *data32,
+				    int *typep, int *countp)
+{
+	int i, type, count, size;
+	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) {
+			printk(KERN_ERR "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 sndrv_ctl_elem_value32 __user *data32,
+				  struct sndrv_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(snd_card_t *card, 
+					 struct sndrv_ctl_elem_value32 __user *data32)
+{
+	struct sndrv_ctl_elem_value *data;
+	int err, type, count;
+
+	data = kcalloc(1, sizeof(*data), GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
+
+	if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
+		goto error;
+	if ((err = snd_ctl_elem_read(card, data)) < 0)
+		goto error;
+	err = copy_ctl_value_to_user(data32, data, type, count);
+ error:
+	kfree(data);
+	return err;
+}
+
+static int snd_ctl_elem_write_user_compat(snd_ctl_file_t *file,
+					  struct sndrv_ctl_elem_value32 __user *data32)
+{
+	struct sndrv_ctl_elem_value *data;
+	int err, type, count;
+
+	data = kcalloc(1, sizeof(*data), GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
+
+	if ((err = copy_ctl_value_from_user(file->card, data, data32, &type, &count)) < 0)
+		goto error;
+	if ((err = snd_ctl_elem_write(file->card, file, data)) < 0)
+		goto error;
+	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(snd_ctl_file_t *file,
+				   struct sndrv_ctl_elem_info32 __user *data32,
+				   int replace)
+{
+	struct sndrv_ctl_elem_info *data;
+	int err;
+
+	data = kcalloc(1, 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;
+		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 sndrv_ctl_elem_list32),
+	SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct sndrv_ctl_elem_info32),
+	SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct sndrv_ctl_elem_value32),
+	SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct sndrv_ctl_elem_value32),
+	SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct sndrv_ctl_elem_info32),
+	SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct sndrv_ctl_elem_info32),
+};
+
+static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	snd_ctl_file_t *ctl;
+	struct list_head *list;
+	void __user *argp = compat_ptr(arg);
+	int err;
+
+	ctl = file->private_data;
+	snd_assert(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:
+		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(list, &snd_control_compat_ioctls) {
+		snd_kctl_ioctl_t *p = list_entry(list, snd_kctl_ioctl_t, 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;
+}