2 * 32bit -> 64bit ioctl wrapper for control API
3 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <sound/driver.h>
22 #include <linux/sched.h>
23 #include <linux/smp_lock.h>
24 #include <linux/init.h>
25 #include <linux/time.h>
26 #include <linux/slab.h>
28 #include <sound/core.h>
29 #include <sound/control.h>
30 #include <sound/minors.h>
31 #include <asm/uaccess.h>
36 * register/unregister mappers
37 * exported for other modules
40 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
41 MODULE_DESCRIPTION("ioctl32 wrapper for ALSA");
42 MODULE_LICENSE("GPL");
44 int register_ioctl32_conversion(unsigned int cmd, int (*handler)(unsigned int, unsigned int, unsigned long, struct file *));
45 int unregister_ioctl32_conversion(unsigned int cmd);
48 int snd_ioctl32_register(struct ioctl32_mapper *mappers)
51 struct ioctl32_mapper *m;
53 for (m = mappers; m->cmd; m++) {
54 err = register_ioctl32_conversion(m->cmd, m->handler);
61 void snd_ioctl32_unregister(struct ioctl32_mapper *mappers)
63 struct ioctl32_mapper *m;
65 for (m = mappers; m->cmd; m++) {
67 unregister_ioctl32_conversion(m->cmd);
77 int snd_ioctl32_compat(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *filp)
79 if (! filp->f_op || ! filp->f_op->ioctl)
81 return filp->f_op->ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
89 struct sndrv_ctl_elem_list32 {
95 unsigned char reserved[50];
96 } /* don't set packed attribute here */;
98 static inline int _snd_ioctl32_ctl_elem_list(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)
100 struct sndrv_ctl_elem_list32 __user *data32;
101 struct sndrv_ctl_elem_list __user *data;
105 data32 = compat_ptr(arg);
106 data = compat_alloc_user_space(sizeof(*data));
108 /* offset, space, used, count */
109 if (copy_in_user(data, data32, 4 * sizeof(u32)))
112 if (__get_user(ptr, &data32->pids) ||
113 __put_user(compat_ptr(ptr), &data->pids))
115 err = file->f_op->ioctl(file->f_dentry->d_inode, file, native_ctl, (unsigned long)data);
118 /* copy the result */
119 if (copy_in_user(data32, data, 4 * sizeof(u32)))
124 DEFINE_ALSA_IOCTL_ENTRY(ctl_elem_list, ctl_elem_list, SNDRV_CTL_IOCTL_ELEM_LIST);
127 * control element info
128 * it uses union, so the things are not easy..
131 struct sndrv_ctl_elem_info32 {
132 struct sndrv_ctl_elem_id id; // the size of struct is same
153 unsigned char reserved[128];
155 unsigned char reserved[64];
156 } __attribute__((packed));
158 static inline int _snd_ioctl32_ctl_elem_info(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)
160 struct sndrv_ctl_elem_info __user *data, *src;
161 struct sndrv_ctl_elem_info32 __user *data32, *dst;
165 data32 = compat_ptr(arg);
166 data = compat_alloc_user_space(sizeof(*data));
169 if (copy_in_user(&data->id, &data32->id, sizeof(data->id)))
171 /* we need to copy the item index.
172 * hope this doesn't break anything..
174 if (copy_in_user(&data->value.enumerated.item,
175 &data32->value.enumerated.item,
176 sizeof(data->value.enumerated.item)))
178 err = file->f_op->ioctl(file->f_dentry->d_inode, file, native_ctl, (unsigned long)data);
181 /* restore info to 32bit */
182 /* for COPY_CVT macro */
185 /* id, type, access, count */
186 if (copy_in_user(&data32->id, &data->id, sizeof(data->id)) ||
187 copy_in_user(&data32->type, &data->type, 3 * sizeof(u32)))
190 __get_user(type, &data->type);
192 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
193 case SNDRV_CTL_ELEM_TYPE_INTEGER:
194 COPY_CVT(value.integer.min);
195 COPY_CVT(value.integer.max);
196 COPY_CVT(value.integer.step);
198 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
199 if (copy_in_user(&data32->value.integer64,
200 &data->value.integer64,
201 sizeof(data->value.integer64)))
204 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
205 if (copy_in_user(&data32->value.enumerated,
206 &data->value.enumerated,
207 sizeof(data->value.enumerated)))
216 DEFINE_ALSA_IOCTL_ENTRY(ctl_elem_info, ctl_elem_info, SNDRV_CTL_IOCTL_ELEM_INFO);
218 struct sndrv_ctl_elem_value32 {
219 struct sndrv_ctl_elem_id id;
220 unsigned int indirect; /* bit-field causes misalignment */
222 s32 integer[128]; /* integer and boolean need conversion */
223 #ifndef CONFIG_X86_64
224 s64 integer64[64]; /* for alignment */
226 unsigned char data[512]; /* others should be compatible */
228 unsigned char reserved[128]; /* not used */
232 /* hmm, it's so hard to retrieve the value type from the control id.. */
233 static int get_ctl_type(snd_card_t *card, snd_ctl_elem_id_t *id)
235 snd_kcontrol_t *kctl;
236 snd_ctl_elem_info_t info;
239 down_read(&card->controls_rwsem);
240 kctl = snd_ctl_find_id(card, id);
242 up_read(&card->controls_rwsem);
246 err = kctl->info(kctl, &info);
247 up_read(&card->controls_rwsem);
253 extern int snd_major;
255 static inline int _snd_ioctl32_ctl_elem_value(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)
257 struct sndrv_ctl_elem_value *data;
258 struct sndrv_ctl_elem_value32 __user *data32;
260 int err, i, indirect;
264 if (imajor(file->f_dentry->d_inode) != snd_major ||
265 SNDRV_MINOR_DEVICE(iminor(file->f_dentry->d_inode)) != SNDRV_MINOR_CONTROL)
268 if ((ctl = file->private_data) == NULL)
271 data32 = compat_ptr(arg);
272 data = kcalloc(1, sizeof(*data), GFP_KERNEL);
276 if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) {
280 if (__get_user(indirect, &data32->indirect)) {
284 /* FIXME: indirect access is not supported */
289 type = get_ctl_type(ctl->card, &data->id);
296 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
297 case SNDRV_CTL_ELEM_TYPE_INTEGER:
298 for (i = 0; i < 128; i++) {
300 if (__get_user(val, &data32->value.integer[i])) {
304 data->value.integer.value[i] = val;
307 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
308 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
309 case SNDRV_CTL_ELEM_TYPE_BYTES:
310 case SNDRV_CTL_ELEM_TYPE_IEC958:
311 if (__copy_from_user(data->value.bytes.data,
313 sizeof(data32->value.data))) {
319 printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
324 if (native_ctl == SNDRV_CTL_IOCTL_ELEM_READ)
325 err = snd_ctl_elem_read(ctl->card, data);
327 err = snd_ctl_elem_write(ctl->card, ctl, data);
330 /* restore info to 32bit */
332 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
333 case SNDRV_CTL_ELEM_TYPE_INTEGER:
334 for (i = 0; i < 128; i++) {
336 val = data->value.integer.value[i];
337 if (__put_user(val, &data32->value.integer[i])) {
344 if (__copy_to_user(data32->value.data,
345 data->value.bytes.data,
346 sizeof(data32->value.data))) {
359 DEFINE_ALSA_IOCTL_ENTRY(ctl_elem_read, ctl_elem_value, SNDRV_CTL_IOCTL_ELEM_READ);
360 DEFINE_ALSA_IOCTL_ENTRY(ctl_elem_write, ctl_elem_value, SNDRV_CTL_IOCTL_ELEM_WRITE);
365 #define AP(x) snd_ioctl32_##x
368 SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct sndrv_ctl_elem_list32),
369 SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct sndrv_ctl_elem_info32),
370 SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct sndrv_ctl_elem_value32),
371 SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct sndrv_ctl_elem_value32),
374 static struct ioctl32_mapper control_mappers[] = {
375 /* controls (without rawmidi, hwdep, timer releated ones) */
376 MAP_COMPAT(SNDRV_CTL_IOCTL_PVERSION),
377 MAP_COMPAT(SNDRV_CTL_IOCTL_CARD_INFO),
378 { SNDRV_CTL_IOCTL_ELEM_LIST32, AP(ctl_elem_list) },
379 { SNDRV_CTL_IOCTL_ELEM_INFO32, AP(ctl_elem_info) },
380 { SNDRV_CTL_IOCTL_ELEM_READ32, AP(ctl_elem_read) },
381 { SNDRV_CTL_IOCTL_ELEM_WRITE32, AP(ctl_elem_write) },
382 MAP_COMPAT(SNDRV_CTL_IOCTL_ELEM_LOCK),
383 MAP_COMPAT(SNDRV_CTL_IOCTL_ELEM_UNLOCK),
384 MAP_COMPAT(SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS),
385 MAP_COMPAT(SNDRV_CTL_IOCTL_HWDEP_INFO),
386 MAP_COMPAT(SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE),
387 MAP_COMPAT(SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE),
388 MAP_COMPAT(SNDRV_CTL_IOCTL_PCM_INFO),
389 MAP_COMPAT(SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE),
390 MAP_COMPAT(SNDRV_CTL_IOCTL_POWER),
391 MAP_COMPAT(SNDRV_CTL_IOCTL_POWER_STATE),
399 extern struct ioctl32_mapper pcm_mappers[];
400 extern struct ioctl32_mapper rawmidi_mappers[];
401 extern struct ioctl32_mapper timer_mappers[];
402 extern struct ioctl32_mapper hwdep_mappers[];
403 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
404 extern struct ioctl32_mapper seq_mappers[];
407 static void snd_ioctl32_done(void)
409 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
410 snd_ioctl32_unregister(seq_mappers);
412 snd_ioctl32_unregister(hwdep_mappers);
413 snd_ioctl32_unregister(timer_mappers);
414 snd_ioctl32_unregister(rawmidi_mappers);
415 snd_ioctl32_unregister(pcm_mappers);
416 snd_ioctl32_unregister(control_mappers);
419 static int __init snd_ioctl32_init(void)
421 snd_ioctl32_register(control_mappers);
422 snd_ioctl32_register(pcm_mappers);
423 snd_ioctl32_register(rawmidi_mappers);
424 snd_ioctl32_register(timer_mappers);
425 snd_ioctl32_register(hwdep_mappers);
426 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
427 snd_ioctl32_register(seq_mappers);
432 module_init(snd_ioctl32_init)
433 module_exit(snd_ioctl32_done)