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ALSA: hda - Add snd_hda_get_conn_list() helper function

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Add a new helper function snd_hda_get_conn_list().
Unlike snd_hda_get_connections(), this function doesn't copy the
connection-list but gives the raw pointer for the cached list.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2011-06-24 14:10:28 +02:00
parent 2e925ddeb9
commit dce2079b89
2 changed files with 47 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
sound/pci/hda/hda_codec.c
View File

@ -311,35 +311,35 @@ EXPORT_SYMBOL_HDA(snd_hda_get_sub_nodes);
static int _hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
hda_nid_t *conn_list, int max_conns);
static bool add_conn_list(struct snd_array *array, hda_nid_t nid);
static int copy_conn_list(hda_nid_t nid, hda_nid_t *dst, int max_dst,
hda_nid_t *src, int len);
/**
* snd_hda_get_connections - get connection list
* @codec: the HDA codec
* @nid: NID to parse
* @conn_list: connection list array
* @max_conns: max. number of connections to store
* @listp: the pointer to store NID list
*
* Parses the connection list of the given widget and stores the list
* of NIDs.
*
* Returns the number of connections, or a negative error code.
*/
int snd_hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
hda_nid_t *conn_list, int max_conns)
int snd_hda_get_conn_list(struct hda_codec *codec, hda_nid_t nid,
const hda_nid_t **listp)
{
struct snd_array *array = &codec->conn_lists;
int i, len, old_used;
hda_nid_t list[HDA_MAX_CONNECTIONS];
hda_nid_t *p;
/* look up the cached results */
for (i = 0; i < array->used; ) {
hda_nid_t *p = snd_array_elem(array, i);
p = snd_array_elem(array, i);
len = p[1];
if (nid == *p)
return copy_conn_list(nid, conn_list, max_conns,
p + 2, len);
if (nid == *p) {
if (listp)
*listp = p + 2;
return len;
}
i += len + 2;
}
@ -355,12 +355,46 @@ int snd_hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
if (!add_conn_list(array, list[i]))
goto error_add;
return copy_conn_list(nid, conn_list, max_conns, list, len);
p = snd_array_elem(array, old_used);
if (listp)
*listp = p + 2;
return len;
error_add:
array->used = old_used;
return -ENOMEM;
}
EXPORT_SYMBOL_HDA(snd_hda_get_conn_list);
/**
* snd_hda_get_connections - copy connection list
* @codec: the HDA codec
* @nid: NID to parse
* @conn_list: connection list array
* @max_conns: max. number of connections to store
*
* Parses the connection list of the given widget and stores the list
* of NIDs.
*
* Returns the number of connections, or a negative error code.
*/
int snd_hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
hda_nid_t *conn_list, int max_conns)
{
const hda_nid_t *list;
int len = snd_hda_get_conn_list(codec, nid, &list);
if (len <= 0)
return len;
if (len > max_conns) {
snd_printk(KERN_ERR "hda_codec: "
"Too many connections %d for NID 0x%x\n",
len, nid);
return -EINVAL;
}
memcpy(conn_list, list, len * sizeof(hda_nid_t));
return len;
}
EXPORT_SYMBOL_HDA(snd_hda_get_connections);
static int _hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
@ -471,19 +505,6 @@ static bool add_conn_list(struct snd_array *array, hda_nid_t nid)
return true;
}
static int copy_conn_list(hda_nid_t nid, hda_nid_t *dst, int max_dst,
hda_nid_t *src, int len)
{
if (len > max_dst) {
snd_printk(KERN_ERR "hda_codec: "
"Too many connections %d for NID 0x%x\n",
len, nid);
return -EINVAL;
}
memcpy(dst, src, len * sizeof(hda_nid_t));
return len;
}
/**
* snd_hda_queue_unsol_event - add an unsolicited event to queue
* @bus: the BUS

2
sound/pci/hda/hda_codec.h
View File

@ -903,6 +903,8 @@ int snd_hda_get_sub_nodes(struct hda_codec *codec, hda_nid_t nid,
hda_nid_t *start_id);
int snd_hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
hda_nid_t *conn_list, int max_conns);
int snd_hda_get_conn_list(struct hda_codec *codec, hda_nid_t nid,
const hda_nid_t **listp);
int snd_hda_query_supported_pcm(struct hda_codec *codec, hda_nid_t nid,
u32 *ratesp, u64 *formatsp, unsigned int *bpsp);