mirror of
https://github.com/torvalds/linux.git
synced 2024-09-21 15:33:19 +00:00
ALSA: control - add sysfs support to the LED trigger module
Create SYSFS/devices/virtual/sound/ctl-led tree
(with SYSFS/class/sound/ctl-led symlink).
speaker/
+-- mode
+-- brightness
mic/
+-- mode
+-- brightness
Copy the idea from the HDA driver and allow to set the audio
LEDs based on the various modes:
- follow mute
- follow moute (inverted to follow mute)
- off
- on
Also, the actual LED state is exposed.
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20210317172945.842280-6-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Jaroslav Kysela
Takashi Iwai
parent
e65bf99718
commit
cb17fe0045
|
|
@ -17,7 +17,23 @@ MODULE_LICENSE("GPL");
|
|||
#define MAX_LED (((SNDRV_CTL_ELEM_ACCESS_MIC_LED - SNDRV_CTL_ELEM_ACCESS_SPK_LED) \
|
||||
>> SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) + 1)
|
||||
|
||||
enum snd_ctl_led_mode {
|
||||
MODE_FOLLOW_MUTE = 0,
|
||||
MODE_FOLLOW_ROUTE,
|
||||
MODE_OFF,
|
||||
MODE_ON,
|
||||
};
|
||||
|
||||
struct snd_ctl_led {
|
||||
struct device dev;
|
||||
struct list_head controls;
|
||||
const char *name;
|
||||
unsigned int group;
|
||||
enum led_audio trigger_type;
|
||||
enum snd_ctl_led_mode mode;
|
||||
};
|
||||
|
||||
struct snd_ctl_led_ctl {
|
||||
struct list_head list;
|
||||
struct snd_card *card;
|
||||
unsigned int access;
|
||||
|
|
@ -26,8 +42,21 @@ struct snd_ctl_led {
|
|||
};
|
||||
|
||||
static DEFINE_MUTEX(snd_ctl_led_mutex);
|
||||
static struct list_head snd_ctl_led_controls[MAX_LED];
|
||||
static bool snd_ctl_led_card_valid[SNDRV_CARDS];
|
||||
static struct snd_ctl_led snd_ctl_leds[MAX_LED] = {
|
||||
{
|
||||
.name = "speaker",
|
||||
.group = (SNDRV_CTL_ELEM_ACCESS_SPK_LED >> SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) - 1,
|
||||
.trigger_type = LED_AUDIO_MUTE,
|
||||
.mode = MODE_FOLLOW_MUTE,
|
||||
},
|
||||
{
|
||||
.name = "mic",
|
||||
.group = (SNDRV_CTL_ELEM_ACCESS_MIC_LED >> SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) - 1,
|
||||
.trigger_type = LED_AUDIO_MICMUTE,
|
||||
.mode = MODE_FOLLOW_MUTE,
|
||||
},
|
||||
};
|
||||
|
||||
#define UPDATE_ROUTE(route, cb) \
|
||||
do { \
|
||||
|
|
@ -47,15 +76,15 @@ static inline unsigned int group_to_access(unsigned int group)
|
|||
return (group + 1) << SNDRV_CTL_ELEM_ACCESS_LED_SHIFT;
|
||||
}
|
||||
|
||||
static struct list_head *snd_ctl_led_controls_by_access(unsigned int access)
|
||||
static struct snd_ctl_led *snd_ctl_led_get_by_access(unsigned int access)
|
||||
{
|
||||
unsigned int group = access_to_group(access);
|
||||
if (group >= MAX_LED)
|
||||
return NULL;
|
||||
return &snd_ctl_led_controls[group];
|
||||
return &snd_ctl_leds[group];
|
||||
}
|
||||
|
||||
static int snd_ctl_led_get(struct snd_ctl_led *lctl)
|
||||
static int snd_ctl_led_get(struct snd_ctl_led_ctl *lctl)
|
||||
{
|
||||
struct snd_kcontrol *kctl = lctl->kctl;
|
||||
struct snd_ctl_elem_info info;
|
||||
|
|
@ -91,22 +120,14 @@ static int snd_ctl_led_get(struct snd_ctl_led *lctl)
|
|||
static void snd_ctl_led_set_state(struct snd_card *card, unsigned int access,
|
||||
struct snd_kcontrol *kctl, unsigned int ioff)
|
||||
{
|
||||
struct list_head *controls;
|
||||
struct snd_ctl_led *lctl;
|
||||
enum led_audio led_trigger_type;
|
||||
struct snd_ctl_led *led;
|
||||
struct snd_ctl_led_ctl *lctl;
|
||||
int route;
|
||||
bool found;
|
||||
|
||||
controls = snd_ctl_led_controls_by_access(access);
|
||||
if (!controls)
|
||||
led = snd_ctl_led_get_by_access(access);
|
||||
if (!led)
|
||||
return;
|
||||
if (access == SNDRV_CTL_ELEM_ACCESS_SPK_LED) {
|
||||
led_trigger_type = LED_AUDIO_MUTE;
|
||||
} else if (access == SNDRV_CTL_ELEM_ACCESS_MIC_LED) {
|
||||
led_trigger_type = LED_AUDIO_MICMUTE;
|
||||
} else {
|
||||
return;
|
||||
}
|
||||
route = -1;
|
||||
found = false;
|
||||
mutex_lock(&snd_ctl_led_mutex);
|
||||
|
|
@ -115,7 +136,7 @@ static void snd_ctl_led_set_state(struct snd_card *card, unsigned int access,
|
|||
mutex_unlock(&snd_ctl_led_mutex);
|
||||
return;
|
||||
}
|
||||
list_for_each_entry(lctl, controls, list) {
|
||||
list_for_each_entry(lctl, &led->controls, list) {
|
||||
if (lctl->kctl == kctl && lctl->index_offset == ioff)
|
||||
found = true;
|
||||
UPDATE_ROUTE(route, snd_ctl_led_get(lctl));
|
||||
|
|
@ -127,23 +148,29 @@ static void snd_ctl_led_set_state(struct snd_card *card, unsigned int access,
|
|||
lctl->access = access;
|
||||
lctl->kctl = kctl;
|
||||
lctl->index_offset = ioff;
|
||||
list_add(&lctl->list, controls);
|
||||
list_add(&lctl->list, &led->controls);
|
||||
UPDATE_ROUTE(route, snd_ctl_led_get(lctl));
|
||||
}
|
||||
}
|
||||
mutex_unlock(&snd_ctl_led_mutex);
|
||||
switch (led->mode) {
|
||||
case MODE_OFF: route = 1; break;
|
||||
case MODE_ON: route = 0; break;
|
||||
case MODE_FOLLOW_ROUTE: if (route >= 0) route ^= 1; break;
|
||||
case MODE_FOLLOW_MUTE: /* noop */ break;
|
||||
}
|
||||
if (route >= 0)
|
||||
ledtrig_audio_set(led_trigger_type, route ? LED_OFF : LED_ON);
|
||||
ledtrig_audio_set(led->trigger_type, route ? LED_OFF : LED_ON);
|
||||
}
|
||||
|
||||
static struct snd_ctl_led *snd_ctl_led_find(struct snd_kcontrol *kctl, unsigned int ioff)
|
||||
static struct snd_ctl_led_ctl *snd_ctl_led_find(struct snd_kcontrol *kctl, unsigned int ioff)
|
||||
{
|
||||
struct list_head *controls;
|
||||
struct snd_ctl_led *lctl;
|
||||
struct snd_ctl_led_ctl *lctl;
|
||||
unsigned int group;
|
||||
|
||||
for (group = 0; group < MAX_LED; group++) {
|
||||
controls = &snd_ctl_led_controls[group];
|
||||
controls = &snd_ctl_leds[group].controls;
|
||||
list_for_each_entry(lctl, controls, list)
|
||||
if (lctl->kctl == kctl && lctl->index_offset == ioff)
|
||||
return lctl;
|
||||
|
|
@ -154,7 +181,7 @@ static struct snd_ctl_led *snd_ctl_led_find(struct snd_kcontrol *kctl, unsigned
|
|||
static unsigned int snd_ctl_led_remove(struct snd_kcontrol *kctl, unsigned int ioff,
|
||||
unsigned int access)
|
||||
{
|
||||
struct snd_ctl_led *lctl;
|
||||
struct snd_ctl_led_ctl *lctl;
|
||||
unsigned int ret = 0;
|
||||
|
||||
mutex_lock(&snd_ctl_led_mutex);
|
||||
|
|
@ -206,13 +233,13 @@ static void snd_ctl_led_refresh(void)
|
|||
static void snd_ctl_led_clean(struct snd_card *card)
|
||||
{
|
||||
unsigned int group;
|
||||
struct list_head *controls;
|
||||
struct snd_ctl_led *lctl;
|
||||
struct snd_ctl_led *led;
|
||||
struct snd_ctl_led_ctl *lctl;
|
||||
|
||||
for (group = 0; group < MAX_LED; group++) {
|
||||
controls = &snd_ctl_led_controls[group];
|
||||
led = &snd_ctl_leds[group];
|
||||
repeat:
|
||||
list_for_each_entry(lctl, controls, list)
|
||||
list_for_each_entry(lctl, &led->controls, list)
|
||||
if (!card || lctl->card == card) {
|
||||
list_del(&lctl->list);
|
||||
kfree(lctl);
|
||||
|
|
@ -248,6 +275,82 @@ static void snd_ctl_led_disconnect(struct snd_card *card)
|
|||
snd_ctl_led_refresh();
|
||||
}
|
||||
|
||||
/*
|
||||
* sysfs
|
||||
*/
|
||||
|
||||
static ssize_t show_mode(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);
|
||||
const char *str;
|
||||
|
||||
switch (led->mode) {
|
||||
case MODE_FOLLOW_MUTE: str = "follow-mute"; break;
|
||||
case MODE_FOLLOW_ROUTE: str = "follow-route"; break;
|
||||
case MODE_ON: str = "on"; break;
|
||||
case MODE_OFF: str = "off"; break;
|
||||
}
|
||||
return sprintf(buf, "%s\n", str);
|
||||
}
|
||||
|
||||
static ssize_t store_mode(struct device *dev, struct device_attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);
|
||||
char _buf[16];
|
||||
size_t l = min(count, sizeof(_buf) - 1) + 1;
|
||||
enum snd_ctl_led_mode mode;
|
||||
|
||||
memcpy(_buf, buf, l);
|
||||
_buf[l] = '\0';
|
||||
if (strstr(_buf, "mute"))
|
||||
mode = MODE_FOLLOW_MUTE;
|
||||
else if (strstr(_buf, "route"))
|
||||
mode = MODE_FOLLOW_ROUTE;
|
||||
else if (strncmp(_buf, "off", 3) == 0 || strncmp(_buf, "0", 1) == 0)
|
||||
mode = MODE_OFF;
|
||||
else if (strncmp(_buf, "on", 2) == 0 || strncmp(_buf, "1", 1) == 0)
|
||||
mode = MODE_ON;
|
||||
else
|
||||
return count;
|
||||
|
||||
mutex_lock(&snd_ctl_led_mutex);
|
||||
led->mode = mode;
|
||||
mutex_unlock(&snd_ctl_led_mutex);
|
||||
|
||||
snd_ctl_led_set_state(NULL, group_to_access(led->group), NULL, 0);
|
||||
return count;
|
||||
}
|
||||
|
||||
static ssize_t show_brightness(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);
|
||||
|
||||
return sprintf(buf, "%u\n", ledtrig_audio_get(led->trigger_type));
|
||||
}
|
||||
|
||||
static DEVICE_ATTR(mode, 0644, show_mode, store_mode);
|
||||
static DEVICE_ATTR(brightness, 0444, show_brightness, NULL);
|
||||
|
||||
static struct attribute *snd_ctl_led_dev_attrs[] = {
|
||||
&dev_attr_mode.attr,
|
||||
&dev_attr_brightness.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static const struct attribute_group snd_ctl_led_dev_attr_group = {
|
||||
.attrs = snd_ctl_led_dev_attrs,
|
||||
};
|
||||
|
||||
static const struct attribute_group *snd_ctl_led_dev_attr_groups[] = {
|
||||
&snd_ctl_led_dev_attr_group,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static struct device snd_ctl_led_dev;
|
||||
|
||||
/*
|
||||
* Control layer registration
|
||||
*/
|
||||
|
|
@ -260,16 +363,47 @@ static struct snd_ctl_layer_ops snd_ctl_led_lops = {
|
|||
|
||||
static int __init snd_ctl_led_init(void)
|
||||
{
|
||||
struct snd_ctl_led *led;
|
||||
unsigned int group;
|
||||
|
||||
for (group = 0; group < MAX_LED; group++)
|
||||
INIT_LIST_HEAD(&snd_ctl_led_controls[group]);
|
||||
device_initialize(&snd_ctl_led_dev);
|
||||
snd_ctl_led_dev.class = sound_class;
|
||||
dev_set_name(&snd_ctl_led_dev, "ctl-led");
|
||||
if (device_add(&snd_ctl_led_dev)) {
|
||||
put_device(&snd_ctl_led_dev);
|
||||
return -ENOMEM;
|
||||
}
|
||||
for (group = 0; group < MAX_LED; group++) {
|
||||
led = &snd_ctl_leds[group];
|
||||
INIT_LIST_HEAD(&led->controls);
|
||||
device_initialize(&led->dev);
|
||||
led->dev.parent = &snd_ctl_led_dev;
|
||||
led->dev.groups = snd_ctl_led_dev_attr_groups;
|
||||
dev_set_name(&led->dev, led->name);
|
||||
if (device_add(&led->dev)) {
|
||||
put_device(&led->dev);
|
||||
for (; group > 0; group--) {
|
||||
led = &snd_ctl_leds[group];
|
||||
device_del(&led->dev);
|
||||
}
|
||||
device_del(&snd_ctl_led_dev);
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
snd_ctl_register_layer(&snd_ctl_led_lops);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit snd_ctl_led_exit(void)
|
||||
{
|
||||
struct snd_ctl_led *led;
|
||||
unsigned int group;
|
||||
|
||||
for (group = 0; group < MAX_LED; group++) {
|
||||
led = &snd_ctl_leds[group];
|
||||
device_del(&led->dev);
|
||||
}
|
||||
device_del(&snd_ctl_led_dev);
|
||||
snd_ctl_disconnect_layer(&snd_ctl_led_lops);
|
||||
snd_ctl_led_clean(NULL);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user