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ALSA: usb-audio - Cache mixer values

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Cache mixer values in usb-audio driver to reduce too excessive
accesses to the hardware.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2009-01-15 17:05:24 +01:00
parent 37a76bd4f1
commit 641b487944
1 changed files with 70 additions and 52 deletions
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122
sound/usb/usbmixer.c
View file

@ -110,6 +110,8 @@ struct mixer_build {
const struct usbmix_selector_map *selector_map;
};
#define MAX_CHANNELS 10 /* max logical channels */
struct usb_mixer_elem_info {
struct usb_mixer_interface *mixer;
struct usb_mixer_elem_info *next_id_elem; /* list of controls with same id */
@ -120,6 +122,8 @@ struct usb_mixer_elem_info {
int channels;
int val_type;
int min, max, res;
int cached;
int cache_val[MAX_CHANNELS];
u8 initialized;
};
@ -181,8 +185,6 @@ enum {
USB_PROC_DCR_RELEASE = 6,
};
#define MAX_CHANNELS 10 /* max logical channels */
/*
* manual mapping of mixer names
@ -376,11 +378,35 @@ static int get_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int *
}
/* channel = 0: master, 1 = first channel */
static inline int get_cur_mix_value(struct usb_mixer_elem_info *cval, int channel, int *value)
static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
int channel, int *value)
{
return get_ctl_value(cval, GET_CUR, (cval->control << 8) | channel, value);
}
static int get_cur_mix_value(struct usb_mixer_elem_info *cval,
int channel, int index, int *value)
{
int err;
if (cval->cached & (1 << channel)) {
*value = cval->cache_val[index];
return 0;
}
err = get_cur_mix_raw(cval, channel, value);
if (err < 0) {
if (!cval->mixer->ignore_ctl_error)
snd_printd(KERN_ERR "cannot get current value for "
"control %d ch %d: err = %d\n",
cval->control, channel, err);
return err;
}
cval->cached |= 1 << channel;
cval->cache_val[index] = *value;
return 0;
}
/*
* set a mixer value
*/
@ -412,9 +438,17 @@ static int set_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int v
return set_ctl_value(cval, SET_CUR, validx, value);
}
static inline int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel, int value)
static int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
int index, int value)
{
return set_ctl_value(cval, SET_CUR, (cval->control << 8) | channel, value);
int err;
err = set_ctl_value(cval, SET_CUR, (cval->control << 8) | channel,
value);
if (err < 0)
return err;
cval->cached |= 1 << channel;
cval->cache_val[index] = value;
return 0;
}
/*
@ -718,7 +752,7 @@ static int get_min_max(struct usb_mixer_elem_info *cval, int default_min)
if (cval->min + cval->res < cval->max) {
int last_valid_res = cval->res;
int saved, test, check;
get_cur_mix_value(cval, minchn, &saved);
get_cur_mix_raw(cval, minchn, &saved);
for (;;) {
test = saved;
if (test < cval->max)
@ -726,8 +760,8 @@ static int get_min_max(struct usb_mixer_elem_info *cval, int default_min)
else
test -= cval->res;
if (test < cval->min || test > cval->max ||
set_cur_mix_value(cval, minchn, test) ||
get_cur_mix_value(cval, minchn, &check)) {
set_cur_mix_value(cval, minchn, 0, test) ||
get_cur_mix_raw(cval, minchn, &check)) {
cval->res = last_valid_res;
break;
}
@ -735,7 +769,7 @@ static int get_min_max(struct usb_mixer_elem_info *cval, int default_min)
break;
cval->res *= 2;
}
set_cur_mix_value(cval, minchn, saved);
set_cur_mix_value(cval, minchn, 0, saved);
}
cval->initialized = 1;
@ -775,35 +809,25 @@ static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol, struct snd_ctl_e
struct usb_mixer_elem_info *cval = kcontrol->private_data;
int c, cnt, val, err;
ucontrol->value.integer.value[0] = cval->min;
if (cval->cmask) {
cnt = 0;
for (c = 0; c < MAX_CHANNELS; c++) {
if (cval->cmask & (1 << c)) {
err = get_cur_mix_value(cval, c + 1, &val);
if (err < 0) {
if (cval->mixer->ignore_ctl_error) {
ucontrol->value.integer.value[0] = cval->min;
return 0;
}
snd_printd(KERN_ERR "cannot get current value for control %d ch %d: err = %d\n", cval->control, c + 1, err);
return err;
}
val = get_relative_value(cval, val);
ucontrol->value.integer.value[cnt] = val;
cnt++;
}
if (!(cval->cmask & (1 << c)))
continue;
err = get_cur_mix_value(cval, c + 1, cnt, &val);
if (err < 0)
return cval->mixer->ignore_ctl_error ? 0 : err;
val = get_relative_value(cval, val);
ucontrol->value.integer.value[cnt] = val;
cnt++;
}
return 0;
} else {
/* master channel */
err = get_cur_mix_value(cval, 0, &val);
if (err < 0) {
if (cval->mixer->ignore_ctl_error) {
ucontrol->value.integer.value[0] = cval->min;
return 0;
}
snd_printd(KERN_ERR "cannot get current value for control %d master ch: err = %d\n", cval->control, err);
return err;
}
err = get_cur_mix_value(cval, 0, 0, &val);
if (err < 0)
return cval->mixer->ignore_ctl_error ? 0 : err;
val = get_relative_value(cval, val);
ucontrol->value.integer.value[0] = val;
}
@ -820,34 +844,28 @@ static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, struct snd_ctl_e
if (cval->cmask) {
cnt = 0;
for (c = 0; c < MAX_CHANNELS; c++) {
if (cval->cmask & (1 << c)) {
err = get_cur_mix_value(cval, c + 1, &oval);
if (err < 0) {
if (cval->mixer->ignore_ctl_error)
return 0;
return err;
}
val = ucontrol->value.integer.value[cnt];
val = get_abs_value(cval, val);
if (oval != val) {
set_cur_mix_value(cval, c + 1, val);
changed = 1;
}
get_cur_mix_value(cval, c + 1, &val);
cnt++;
if (!(cval->cmask & (1 << c)))
continue;
err = get_cur_mix_value(cval, c + 1, cnt, &oval);
if (err < 0)
return cval->mixer->ignore_ctl_error ? 0 : err;
val = ucontrol->value.integer.value[cnt];
val = get_abs_value(cval, val);
if (oval != val) {
set_cur_mix_value(cval, c + 1, cnt, val);
changed = 1;
}
cnt++;
}
} else {
/* master channel */
err = get_cur_mix_value(cval, 0, &oval);
if (err < 0 && cval->mixer->ignore_ctl_error)
return 0;
err = get_cur_mix_value(cval, 0, 0, &oval);
if (err < 0)
return err;
return cval->mixer->ignore_ctl_error ? 0 : err;
val = ucontrol->value.integer.value[0];
val = get_abs_value(cval, val);
if (val != oval) {
set_cur_mix_value(cval, 0, val);
set_cur_mix_value(cval, 0, 0, val);
changed = 1;
}
}