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Subject[PATCH v2 5/7] ALSA: usb: mixer: make string parsing independent of mixer_build state
Date
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>
---
sound/usb/mixer.c | 30 ++++++++++++++++--------------
1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index bb203b3..e280354 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -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 @@ int snd_usb_mixer_add_control(struct usb_mixer_elem_list *list,
{ 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)
--
1.9.1
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