[ALSA] Control API - more robust TLV implementation
- added callback option - added READ/WRITE/COMMAND flags to access member - added WRITE/COMMAND ioctls - added SNDRV_CTL_EVENT_MASK_TLV for TLV change notifications - added TLV support to ELEM_ADD ioctl Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
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6bbe13ecbb
commit
8aa9b586e4
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@ -727,10 +727,15 @@ typedef int __bitwise snd_ctl_elem_iface_t;
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#define SNDRV_CTL_ELEM_ACCESS_WRITE (1<<1)
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#define SNDRV_CTL_ELEM_ACCESS_READWRITE (SNDRV_CTL_ELEM_ACCESS_READ|SNDRV_CTL_ELEM_ACCESS_WRITE)
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#define SNDRV_CTL_ELEM_ACCESS_VOLATILE (1<<2) /* control value may be changed without a notification */
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#define SNDRV_CTL_ELEM_ACCESS_TIMESTAMP (1<<2) /* when was control changed */
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#define SNDRV_CTL_ELEM_ACCESS_TIMESTAMP (1<<3) /* when was control changed */
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#define SNDRV_CTL_ELEM_ACCESS_TLV_READ (1<<4) /* TLV read is possible */
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#define SNDRV_CTL_ELEM_ACCESS_TLV_WRITE (1<<5) /* TLV write is possible */
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#define SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE (SNDRV_CTL_ELEM_ACCESS_TLV_READ|SNDRV_CTL_ELEM_ACCESS_TLV_WRITE)
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#define SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND (1<<6) /* TLV command is possible */
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#define SNDRV_CTL_ELEM_ACCESS_INACTIVE (1<<8) /* control does actually nothing, but may be updated */
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#define SNDRV_CTL_ELEM_ACCESS_LOCK (1<<9) /* write lock */
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#define SNDRV_CTL_ELEM_ACCESS_OWNER (1<<10) /* write lock owner */
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#define SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK (1<<28) /* kernel use a TLV callback */
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#define SNDRV_CTL_ELEM_ACCESS_USER (1<<29) /* user space element */
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#define SNDRV_CTL_ELEM_ACCESS_DINDIRECT (1<<30) /* indirect access for matrix dimensions in the info structure */
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#define SNDRV_CTL_ELEM_ACCESS_INDIRECT (1<<31) /* indirect access for element value in the value structure */
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@ -838,6 +843,8 @@ enum {
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SNDRV_CTL_IOCTL_ELEM_REPLACE = _IOWR('U', 0x18, struct snd_ctl_elem_info),
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SNDRV_CTL_IOCTL_ELEM_REMOVE = _IOWR('U', 0x19, struct snd_ctl_elem_id),
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SNDRV_CTL_IOCTL_TLV_READ = _IOWR('U', 0x1a, struct snd_ctl_tlv),
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SNDRV_CTL_IOCTL_TLV_WRITE = _IOWR('U', 0x1b, struct snd_ctl_tlv),
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SNDRV_CTL_IOCTL_TLV_COMMAND = _IOWR('U', 0x1c, struct snd_ctl_tlv),
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SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE = _IOWR('U', 0x20, int),
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SNDRV_CTL_IOCTL_HWDEP_INFO = _IOR('U', 0x21, struct snd_hwdep_info),
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SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE = _IOR('U', 0x30, int),
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@ -862,6 +869,7 @@ enum sndrv_ctl_event_type {
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#define SNDRV_CTL_EVENT_MASK_VALUE (1<<0) /* element value was changed */
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#define SNDRV_CTL_EVENT_MASK_INFO (1<<1) /* element info was changed */
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#define SNDRV_CTL_EVENT_MASK_ADD (1<<2) /* element was added */
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#define SNDRV_CTL_EVENT_MASK_TLV (1<<3) /* element TLV tree was changed */
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#define SNDRV_CTL_EVENT_MASK_REMOVE (~0U) /* element was removed */
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struct snd_ctl_event {
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@ -30,6 +30,11 @@ struct snd_kcontrol;
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typedef int (snd_kcontrol_info_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_info * uinfo);
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typedef int (snd_kcontrol_get_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);
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typedef int (snd_kcontrol_put_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);
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typedef int (snd_kcontrol_tlv_rw_t)(struct snd_kcontrol *kcontrol,
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int op_flag, /* 0=read,1=write,-1=command */
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unsigned int size,
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unsigned int __user *tlv);
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struct snd_kcontrol_new {
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snd_ctl_elem_iface_t iface; /* interface identifier */
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@ -42,7 +47,10 @@ struct snd_kcontrol_new {
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snd_kcontrol_info_t *info;
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snd_kcontrol_get_t *get;
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snd_kcontrol_put_t *put;
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unsigned int *tlv;
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union {
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snd_kcontrol_tlv_rw_t *c;
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unsigned int *p;
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} tlv;
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unsigned long private_value;
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};
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@ -59,7 +67,11 @@ struct snd_kcontrol {
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snd_kcontrol_info_t *info;
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snd_kcontrol_get_t *get;
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snd_kcontrol_put_t *put;
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unsigned int *tlv;
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snd_kcontrol_tlv_rw_t *tlv_rw;
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union {
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snd_kcontrol_tlv_rw_t *c;
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unsigned int *p;
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} tlv;
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unsigned long private_value;
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void *private_data;
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void (*private_free)(struct snd_kcontrol *kcontrol);
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@ -236,12 +236,16 @@ struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol,
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kctl.id.index = ncontrol->index;
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kctl.count = ncontrol->count ? ncontrol->count : 1;
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access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
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(ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|SNDRV_CTL_ELEM_ACCESS_INACTIVE|
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SNDRV_CTL_ELEM_ACCESS_DINDIRECT|SNDRV_CTL_ELEM_ACCESS_INDIRECT));
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(ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
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SNDRV_CTL_ELEM_ACCESS_INACTIVE|
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SNDRV_CTL_ELEM_ACCESS_DINDIRECT|
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SNDRV_CTL_ELEM_ACCESS_INDIRECT|
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SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE|
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SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK));
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kctl.info = ncontrol->info;
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kctl.get = ncontrol->get;
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kctl.put = ncontrol->put;
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kctl.tlv = ncontrol->tlv;
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kctl.tlv.p = ncontrol->tlv.p;
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kctl.private_value = ncontrol->private_value;
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kctl.private_data = private_data;
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return snd_ctl_new(&kctl, access);
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@ -883,6 +887,8 @@ struct user_element {
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struct snd_ctl_elem_info info;
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void *elem_data; /* element data */
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unsigned long elem_data_size; /* size of element data in bytes */
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void *tlv_data; /* TLV data */
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unsigned long tlv_data_size; /* TLV data size */
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void *priv_data; /* private data (like strings for enumerated type) */
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unsigned long priv_data_size; /* size of private data in bytes */
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};
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@ -917,9 +923,46 @@ static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol,
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return change;
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}
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static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol,
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int op_flag,
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unsigned int size,
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unsigned int __user *tlv)
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{
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struct user_element *ue = kcontrol->private_data;
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int change = 0;
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void *new_data;
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if (op_flag > 0) {
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if (size > 1024 * 128) /* sane value */
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return -EINVAL;
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new_data = kmalloc(size, GFP_KERNEL);
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if (new_data == NULL)
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return -ENOMEM;
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if (copy_from_user(new_data, tlv, size)) {
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kfree(new_data);
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return -EFAULT;
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}
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change = ue->tlv_data_size != size;
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if (!change)
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change = memcmp(ue->tlv_data, new_data, size);
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kfree(ue->tlv_data);
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ue->tlv_data = new_data;
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ue->tlv_data_size = size;
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} else {
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if (size < ue->tlv_data_size)
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return -ENOSPC;
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if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size))
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return -EFAULT;
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}
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return change;
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}
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static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol)
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{
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kfree(kcontrol->private_data);
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struct user_element *ue = kcontrol->private_data;
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if (ue->tlv_data)
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kfree(ue->tlv_data);
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kfree(ue);
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}
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static int snd_ctl_elem_add(struct snd_ctl_file *file,
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@ -938,7 +981,8 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
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return -EINVAL;
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access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
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(info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|
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SNDRV_CTL_ELEM_ACCESS_INACTIVE));
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SNDRV_CTL_ELEM_ACCESS_INACTIVE|
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SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE));
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info->id.numid = 0;
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memset(&kctl, 0, sizeof(kctl));
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down_write(&card->controls_rwsem);
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@ -964,6 +1008,10 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
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kctl.get = snd_ctl_elem_user_get;
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if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
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kctl.put = snd_ctl_elem_user_put;
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if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) {
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kctl.tlv.c = snd_ctl_elem_user_tlv;
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access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
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}
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switch (info->type) {
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case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
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private_size = sizeof(char);
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@ -1068,38 +1116,65 @@ static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr)
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return 0;
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}
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static int snd_ctl_tlv_read(struct snd_card *card,
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struct snd_ctl_tlv __user *_tlv)
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static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file,
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struct snd_ctl_tlv __user *_tlv,
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int op_flag)
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{
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struct snd_card *card = file->card;
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struct snd_ctl_tlv tlv;
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struct snd_kcontrol *kctl;
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struct snd_kcontrol_volatile *vd;
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unsigned int len;
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int err = 0;
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if (copy_from_user(&tlv, _tlv, sizeof(tlv)))
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return -EFAULT;
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if (tlv.length < sizeof(unsigned int) * 3)
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return -EINVAL;
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down_read(&card->controls_rwsem);
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kctl = snd_ctl_find_numid(card, tlv.numid);
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if (kctl == NULL) {
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err = -ENOENT;
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goto __kctl_end;
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}
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if (kctl->tlv == NULL) {
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err = -ENXIO;
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goto __kctl_end;
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}
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len = kctl->tlv[1] + 2 * sizeof(unsigned int);
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if (tlv.length < len) {
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err = -ENOMEM;
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goto __kctl_end;
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}
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if (copy_to_user(_tlv->tlv, kctl->tlv, len))
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err = -EFAULT;
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if (tlv.length < sizeof(unsigned int) * 3)
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return -EINVAL;
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down_read(&card->controls_rwsem);
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kctl = snd_ctl_find_numid(card, tlv.numid);
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if (kctl == NULL) {
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err = -ENOENT;
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goto __kctl_end;
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}
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if (kctl->tlv.p == NULL) {
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err = -ENXIO;
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goto __kctl_end;
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}
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vd = &kctl->vd[tlv.numid - kctl->id.numid];
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if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) ||
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(op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) ||
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(op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) {
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err = -ENXIO;
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goto __kctl_end;
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}
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if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
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if (file && vd->owner != NULL && vd->owner != file) {
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err = -EPERM;
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goto __kctl_end;
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}
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err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv);
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if (err > 0) {
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up_read(&card->controls_rwsem);
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snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id);
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return 0;
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}
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} else {
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if (op_flag) {
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err = -ENXIO;
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goto __kctl_end;
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}
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len = kctl->tlv.p[1] + 2 * sizeof(unsigned int);
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if (tlv.length < len) {
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err = -ENOMEM;
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goto __kctl_end;
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}
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if (copy_to_user(_tlv->tlv, kctl->tlv.p, len))
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err = -EFAULT;
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}
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__kctl_end:
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up_read(&card->controls_rwsem);
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return err;
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up_read(&card->controls_rwsem);
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return err;
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}
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static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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@ -1140,8 +1215,12 @@ static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg
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return snd_ctl_elem_remove(ctl, argp);
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case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
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return snd_ctl_subscribe_events(ctl, ip);
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case SNDRV_CTL_IOCTL_TLV_READ:
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return snd_ctl_tlv_read(card, argp);
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case SNDRV_CTL_IOCTL_TLV_READ:
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return snd_ctl_tlv_ioctl(ctl, argp, 0);
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case SNDRV_CTL_IOCTL_TLV_WRITE:
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return snd_ctl_tlv_ioctl(ctl, argp, 1);
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case SNDRV_CTL_IOCTL_TLV_COMMAND:
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return snd_ctl_tlv_ioctl(ctl, argp, -1);
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case SNDRV_CTL_IOCTL_POWER:
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return -ENOPROTOOPT;
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case SNDRV_CTL_IOCTL_POWER_STATE:
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