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ALSA: usb: mixer: make string parsing independent of mixer_build state

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Functions like snd_usb_copy_string_desc() or
get_term_name() don't actually need mixer_build
state but can use snd_usb_audio structure instead
to get usb device.

This patch has no functional change but prepares
to future UAC3 BADD profiles support which don't
have class-specific descriptors so won't have
mixer_build state.

Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Ruslan Bilovol 2018-05-04 04:24:02 +03:00 committed by Takashi Iwai
parent 3763f61867
commit eccfc1b868
1 changed files with 16 additions and 14 deletions
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30
sound/usb/mixer.c
View file

@ -201,10 +201,10 @@ static void *find_audio_control_unit(struct mixer_build *state,
/*
* copy a string with the given id
*/
static int snd_usb_copy_string_desc(struct mixer_build *state,
static int snd_usb_copy_string_desc(struct snd_usb_audio *chip,
int index, char *buf, int maxlen)
{
int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
int len = usb_string(chip->dev, index, buf, maxlen - 1);
if (len < 0)
return 0;
@ -658,14 +658,14 @@ static struct iterm_name_combo {
{ 0 },
};
static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
static int get_term_name(struct snd_usb_audio *chip, struct usb_audio_term *iterm,
unsigned char *name, int maxlen, int term_only)
{
struct iterm_name_combo *names;
int len;
if (iterm->name) {
len = snd_usb_copy_string_desc(state, iterm->name,
len = snd_usb_copy_string_desc(chip, iterm->name,
name, maxlen);
if (len)
return len;
@ -1407,7 +1407,7 @@ static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
mapped_name = len != 0;
if (!len && nameid)
len = snd_usb_copy_string_desc(state, nameid,
len = snd_usb_copy_string_desc(state->chip, nameid,
kctl->id.name, sizeof(kctl->id.name));
switch (control) {
@ -1422,10 +1422,10 @@ static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
* - otherwise, anonymous name.
*/
if (!len) {
len = get_term_name(state, iterm, kctl->id.name,
len = get_term_name(state->chip, iterm, kctl->id.name,
sizeof(kctl->id.name), 1);
if (!len)
len = get_term_name(state, &state->oterm,
len = get_term_name(state->chip, &state->oterm,
kctl->id.name,
sizeof(kctl->id.name), 1);
if (!len)
@ -1498,7 +1498,7 @@ static void get_connector_control_name(struct mixer_build *state,
struct usb_audio_term *term,
bool is_input, char *name, int name_size)
{
int name_len = get_term_name(state, term, name, name_size, 0);
int name_len = get_term_name(state->chip, term, name, name_size, 0);
if (name_len == 0)
strlcpy(name, "Unknown", name_size);
@ -1597,7 +1597,7 @@ static int parse_clock_source_unit(struct mixer_build *state, int unitid,
}
kctl->private_free = snd_usb_mixer_elem_free;
ret = snd_usb_copy_string_desc(state, hdr->iClockSource,
ret = snd_usb_copy_string_desc(state->chip, hdr->iClockSource,
name, sizeof(name));
if (ret > 0)
snprintf(kctl->id.name, sizeof(kctl->id.name),
@ -1840,7 +1840,7 @@ static void build_mixer_unit_ctl(struct mixer_build *state,
len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
if (!len)
len = get_term_name(state, iterm, kctl->id.name,
len = get_term_name(state->chip, iterm, kctl->id.name,
sizeof(kctl->id.name), 0);
if (!len)
len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
@ -2154,7 +2154,8 @@ static int build_audio_procunit(struct mixer_build *state, int unitid,
nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
len = 0;
if (nameid)
len = snd_usb_copy_string_desc(state, nameid,
len = snd_usb_copy_string_desc(state->chip,
nameid,
kctl->id.name,
sizeof(kctl->id.name));
if (!len)
@ -2350,7 +2351,8 @@ static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
len = check_mapped_selector_name(state, unitid, i, namelist[i],
MAX_ITEM_NAME_LEN);
if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
len = get_term_name(state->chip, &iterm, namelist[i],
MAX_ITEM_NAME_LEN, 0);
if (! len)
sprintf(namelist[i], "Input %u", i);
}
@ -2372,12 +2374,12 @@ static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
/* if iSelector is given, use it */
nameid = uac_selector_unit_iSelector(desc);
if (nameid)
len = snd_usb_copy_string_desc(state, nameid,
len = snd_usb_copy_string_desc(state->chip, nameid,
kctl->id.name,
sizeof(kctl->id.name));
/* ... or pick up the terminal name at next */
if (!len)
len = get_term_name(state, &state->oterm,
len = get_term_name(state->chip, &state->oterm,
kctl->id.name, sizeof(kctl->id.name), 0);
/* ... or use the fixed string "USB" as the last resort */
if (!len)