mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Takashi Iwai](/assets/img/avatar_default.png)
Embedding the ctl_dev in the snd_card object may result in UAF when the delayed kobj release is used; at the delayed kobj release, it still accesses the struct device itself while the card memory (that embeds the struct device) may be already gone. As a workaround, detach the struct device from the card object by allocating via the new snd_device_alloc() helper. The rest are just replacing ctl_dev access to the pointer. This is based on the fix Curtis posted initially. In this patch, the changes are split and use the new helper function instead. Link: https://lore.kernel.org/r/20230801171928.1460120-1-cujomalainey@chromium.org Reviewed-by: Jaroslav Kysela <perex@perex.cz> Signed-off-by: Curtis Malainey <cujomalainey@chromium.org> Tested-by: Curtis Malainey <cujomalainey@chromium.org> Link: https://lore.kernel.org/r/20230816160252.23396-3-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
794 lines
20 KiB
C
794 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* LED state routines for driver control interface
|
|
* Copyright (c) 2021 by Jaroslav Kysela <perex@perex.cz>
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/leds.h>
|
|
#include <sound/core.h>
|
|
#include <sound/control.h>
|
|
|
|
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
|
|
MODULE_DESCRIPTION("ALSA control interface to LED trigger code.");
|
|
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)
|
|
|
|
#define to_led_card_dev(_dev) \
|
|
container_of(_dev, struct snd_ctl_led_card, dev)
|
|
|
|
enum snd_ctl_led_mode {
|
|
MODE_FOLLOW_MUTE = 0,
|
|
MODE_FOLLOW_ROUTE,
|
|
MODE_OFF,
|
|
MODE_ON,
|
|
};
|
|
|
|
struct snd_ctl_led_card {
|
|
struct device dev;
|
|
int number;
|
|
struct snd_ctl_led *led;
|
|
};
|
|
|
|
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_card *cards[SNDRV_CARDS];
|
|
};
|
|
|
|
struct snd_ctl_led_ctl {
|
|
struct list_head list;
|
|
struct snd_card *card;
|
|
unsigned int access;
|
|
struct snd_kcontrol *kctl;
|
|
unsigned int index_offset;
|
|
};
|
|
|
|
static DEFINE_MUTEX(snd_ctl_led_mutex);
|
|
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,
|
|
},
|
|
};
|
|
|
|
static void snd_ctl_led_sysfs_add(struct snd_card *card);
|
|
static void snd_ctl_led_sysfs_remove(struct snd_card *card);
|
|
|
|
#define UPDATE_ROUTE(route, cb) \
|
|
do { \
|
|
int route2 = (cb); \
|
|
if (route2 >= 0) \
|
|
route = route < 0 ? route2 : (route | route2); \
|
|
} while (0)
|
|
|
|
static inline unsigned int access_to_group(unsigned int access)
|
|
{
|
|
return ((access & SNDRV_CTL_ELEM_ACCESS_LED_MASK) >>
|
|
SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) - 1;
|
|
}
|
|
|
|
static inline unsigned int group_to_access(unsigned int group)
|
|
{
|
|
return (group + 1) << SNDRV_CTL_ELEM_ACCESS_LED_SHIFT;
|
|
}
|
|
|
|
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_leds[group];
|
|
}
|
|
|
|
/*
|
|
* A note for callers:
|
|
* The two static variables info and value are protected using snd_ctl_led_mutex.
|
|
*/
|
|
static int snd_ctl_led_get(struct snd_ctl_led_ctl *lctl)
|
|
{
|
|
static struct snd_ctl_elem_info info;
|
|
static struct snd_ctl_elem_value value;
|
|
struct snd_kcontrol *kctl = lctl->kctl;
|
|
unsigned int i;
|
|
int result;
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
info.id = kctl->id;
|
|
info.id.index += lctl->index_offset;
|
|
info.id.numid += lctl->index_offset;
|
|
result = kctl->info(kctl, &info);
|
|
if (result < 0)
|
|
return -1;
|
|
memset(&value, 0, sizeof(value));
|
|
value.id = info.id;
|
|
result = kctl->get(kctl, &value);
|
|
if (result < 0)
|
|
return -1;
|
|
if (info.type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
|
|
info.type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
|
|
for (i = 0; i < info.count; i++)
|
|
if (value.value.integer.value[i] != info.value.integer.min)
|
|
return 1;
|
|
} else if (info.type == SNDRV_CTL_ELEM_TYPE_INTEGER64) {
|
|
for (i = 0; i < info.count; i++)
|
|
if (value.value.integer64.value[i] != info.value.integer64.min)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void snd_ctl_led_set_state(struct snd_card *card, unsigned int access,
|
|
struct snd_kcontrol *kctl, unsigned int ioff)
|
|
{
|
|
struct snd_ctl_led *led;
|
|
struct snd_ctl_led_ctl *lctl;
|
|
int route;
|
|
bool found;
|
|
|
|
led = snd_ctl_led_get_by_access(access);
|
|
if (!led)
|
|
return;
|
|
route = -1;
|
|
found = false;
|
|
mutex_lock(&snd_ctl_led_mutex);
|
|
/* the card may not be registered (active) at this point */
|
|
if (card && !snd_ctl_led_card_valid[card->number]) {
|
|
mutex_unlock(&snd_ctl_led_mutex);
|
|
return;
|
|
}
|
|
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));
|
|
}
|
|
if (!found && kctl && card) {
|
|
lctl = kzalloc(sizeof(*lctl), GFP_KERNEL);
|
|
if (lctl) {
|
|
lctl->card = card;
|
|
lctl->access = access;
|
|
lctl->kctl = kctl;
|
|
lctl->index_offset = ioff;
|
|
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);
|
|
}
|
|
|
|
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_ctl *lctl;
|
|
unsigned int group;
|
|
|
|
for (group = 0; group < MAX_LED; group++) {
|
|
controls = &snd_ctl_leds[group].controls;
|
|
list_for_each_entry(lctl, controls, list)
|
|
if (lctl->kctl == kctl && lctl->index_offset == ioff)
|
|
return lctl;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static unsigned int snd_ctl_led_remove(struct snd_kcontrol *kctl, unsigned int ioff,
|
|
unsigned int access)
|
|
{
|
|
struct snd_ctl_led_ctl *lctl;
|
|
unsigned int ret = 0;
|
|
|
|
mutex_lock(&snd_ctl_led_mutex);
|
|
lctl = snd_ctl_led_find(kctl, ioff);
|
|
if (lctl && (access == 0 || access != lctl->access)) {
|
|
ret = lctl->access;
|
|
list_del(&lctl->list);
|
|
kfree(lctl);
|
|
}
|
|
mutex_unlock(&snd_ctl_led_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void snd_ctl_led_notify(struct snd_card *card, unsigned int mask,
|
|
struct snd_kcontrol *kctl, unsigned int ioff)
|
|
{
|
|
struct snd_kcontrol_volatile *vd;
|
|
unsigned int access, access2;
|
|
|
|
if (mask == SNDRV_CTL_EVENT_MASK_REMOVE) {
|
|
access = snd_ctl_led_remove(kctl, ioff, 0);
|
|
if (access)
|
|
snd_ctl_led_set_state(card, access, NULL, 0);
|
|
} else if (mask & SNDRV_CTL_EVENT_MASK_INFO) {
|
|
vd = &kctl->vd[ioff];
|
|
access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;
|
|
access2 = snd_ctl_led_remove(kctl, ioff, access);
|
|
if (access2)
|
|
snd_ctl_led_set_state(card, access2, NULL, 0);
|
|
if (access)
|
|
snd_ctl_led_set_state(card, access, kctl, ioff);
|
|
} else if ((mask & (SNDRV_CTL_EVENT_MASK_ADD |
|
|
SNDRV_CTL_EVENT_MASK_VALUE)) != 0) {
|
|
vd = &kctl->vd[ioff];
|
|
access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;
|
|
if (access)
|
|
snd_ctl_led_set_state(card, access, kctl, ioff);
|
|
}
|
|
}
|
|
|
|
static int snd_ctl_led_set_id(int card_number, struct snd_ctl_elem_id *id,
|
|
unsigned int group, bool set)
|
|
{
|
|
struct snd_card *card;
|
|
struct snd_kcontrol *kctl;
|
|
struct snd_kcontrol_volatile *vd;
|
|
unsigned int ioff, access, new_access;
|
|
int err = 0;
|
|
|
|
card = snd_card_ref(card_number);
|
|
if (card) {
|
|
down_write(&card->controls_rwsem);
|
|
kctl = snd_ctl_find_id_locked(card, id);
|
|
if (kctl) {
|
|
ioff = snd_ctl_get_ioff(kctl, id);
|
|
vd = &kctl->vd[ioff];
|
|
access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;
|
|
if (access != 0 && access != group_to_access(group)) {
|
|
err = -EXDEV;
|
|
goto unlock;
|
|
}
|
|
new_access = vd->access & ~SNDRV_CTL_ELEM_ACCESS_LED_MASK;
|
|
if (set)
|
|
new_access |= group_to_access(group);
|
|
if (new_access != vd->access) {
|
|
vd->access = new_access;
|
|
snd_ctl_led_notify(card, SNDRV_CTL_EVENT_MASK_INFO, kctl, ioff);
|
|
}
|
|
} else {
|
|
err = -ENOENT;
|
|
}
|
|
unlock:
|
|
up_write(&card->controls_rwsem);
|
|
snd_card_unref(card);
|
|
} else {
|
|
err = -ENXIO;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static void snd_ctl_led_refresh(void)
|
|
{
|
|
unsigned int group;
|
|
|
|
for (group = 0; group < MAX_LED; group++)
|
|
snd_ctl_led_set_state(NULL, group_to_access(group), NULL, 0);
|
|
}
|
|
|
|
static void snd_ctl_led_ctl_destroy(struct snd_ctl_led_ctl *lctl)
|
|
{
|
|
list_del(&lctl->list);
|
|
kfree(lctl);
|
|
}
|
|
|
|
static void snd_ctl_led_clean(struct snd_card *card)
|
|
{
|
|
unsigned int group;
|
|
struct snd_ctl_led *led;
|
|
struct snd_ctl_led_ctl *lctl;
|
|
|
|
for (group = 0; group < MAX_LED; group++) {
|
|
led = &snd_ctl_leds[group];
|
|
repeat:
|
|
list_for_each_entry(lctl, &led->controls, list)
|
|
if (!card || lctl->card == card) {
|
|
snd_ctl_led_ctl_destroy(lctl);
|
|
goto repeat;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int snd_ctl_led_reset(int card_number, unsigned int group)
|
|
{
|
|
struct snd_card *card;
|
|
struct snd_ctl_led *led;
|
|
struct snd_ctl_led_ctl *lctl;
|
|
struct snd_kcontrol_volatile *vd;
|
|
bool change = false;
|
|
|
|
card = snd_card_ref(card_number);
|
|
if (!card)
|
|
return -ENXIO;
|
|
|
|
mutex_lock(&snd_ctl_led_mutex);
|
|
if (!snd_ctl_led_card_valid[card_number]) {
|
|
mutex_unlock(&snd_ctl_led_mutex);
|
|
snd_card_unref(card);
|
|
return -ENXIO;
|
|
}
|
|
led = &snd_ctl_leds[group];
|
|
repeat:
|
|
list_for_each_entry(lctl, &led->controls, list)
|
|
if (lctl->card == card) {
|
|
vd = &lctl->kctl->vd[lctl->index_offset];
|
|
vd->access &= ~group_to_access(group);
|
|
snd_ctl_led_ctl_destroy(lctl);
|
|
change = true;
|
|
goto repeat;
|
|
}
|
|
mutex_unlock(&snd_ctl_led_mutex);
|
|
if (change)
|
|
snd_ctl_led_set_state(NULL, group_to_access(group), NULL, 0);
|
|
snd_card_unref(card);
|
|
return 0;
|
|
}
|
|
|
|
static void snd_ctl_led_register(struct snd_card *card)
|
|
{
|
|
struct snd_kcontrol *kctl;
|
|
unsigned int ioff;
|
|
|
|
if (snd_BUG_ON(card->number < 0 ||
|
|
card->number >= ARRAY_SIZE(snd_ctl_led_card_valid)))
|
|
return;
|
|
mutex_lock(&snd_ctl_led_mutex);
|
|
snd_ctl_led_card_valid[card->number] = true;
|
|
mutex_unlock(&snd_ctl_led_mutex);
|
|
/* the register callback is already called with held card->controls_rwsem */
|
|
list_for_each_entry(kctl, &card->controls, list)
|
|
for (ioff = 0; ioff < kctl->count; ioff++)
|
|
snd_ctl_led_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, kctl, ioff);
|
|
snd_ctl_led_refresh();
|
|
snd_ctl_led_sysfs_add(card);
|
|
}
|
|
|
|
static void snd_ctl_led_disconnect(struct snd_card *card)
|
|
{
|
|
snd_ctl_led_sysfs_remove(card);
|
|
mutex_lock(&snd_ctl_led_mutex);
|
|
snd_ctl_led_card_valid[card->number] = false;
|
|
snd_ctl_led_clean(card);
|
|
mutex_unlock(&snd_ctl_led_mutex);
|
|
snd_ctl_led_refresh();
|
|
}
|
|
|
|
static void snd_ctl_led_card_release(struct device *dev)
|
|
{
|
|
struct snd_ctl_led_card *led_card = to_led_card_dev(dev);
|
|
|
|
kfree(led_card);
|
|
}
|
|
|
|
static void snd_ctl_led_release(struct device *dev)
|
|
{
|
|
}
|
|
|
|
static void snd_ctl_led_dev_release(struct device *dev)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* sysfs
|
|
*/
|
|
|
|
static ssize_t mode_show(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 = NULL;
|
|
|
|
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 sysfs_emit(buf, "%s\n", str);
|
|
}
|
|
|
|
static ssize_t mode_store(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);
|
|
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 brightness_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);
|
|
|
|
return sysfs_emit(buf, "%u\n", ledtrig_audio_get(led->trigger_type));
|
|
}
|
|
|
|
static DEVICE_ATTR_RW(mode);
|
|
static DEVICE_ATTR_RO(brightness);
|
|
|
|
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 char *find_eos(char *s)
|
|
{
|
|
while (*s && *s != ',')
|
|
s++;
|
|
if (*s)
|
|
s++;
|
|
return s;
|
|
}
|
|
|
|
static char *parse_uint(char *s, unsigned int *val)
|
|
{
|
|
unsigned long long res;
|
|
if (kstrtoull(s, 10, &res))
|
|
res = 0;
|
|
*val = res;
|
|
return find_eos(s);
|
|
}
|
|
|
|
static char *parse_string(char *s, char *val, size_t val_size)
|
|
{
|
|
if (*s == '"' || *s == '\'') {
|
|
char c = *s;
|
|
s++;
|
|
while (*s && *s != c) {
|
|
if (val_size > 1) {
|
|
*val++ = *s;
|
|
val_size--;
|
|
}
|
|
s++;
|
|
}
|
|
} else {
|
|
while (*s && *s != ',') {
|
|
if (val_size > 1) {
|
|
*val++ = *s;
|
|
val_size--;
|
|
}
|
|
s++;
|
|
}
|
|
}
|
|
*val = '\0';
|
|
if (*s)
|
|
s++;
|
|
return s;
|
|
}
|
|
|
|
static char *parse_iface(char *s, snd_ctl_elem_iface_t *val)
|
|
{
|
|
if (!strncasecmp(s, "card", 4))
|
|
*val = SNDRV_CTL_ELEM_IFACE_CARD;
|
|
else if (!strncasecmp(s, "mixer", 5))
|
|
*val = SNDRV_CTL_ELEM_IFACE_MIXER;
|
|
return find_eos(s);
|
|
}
|
|
|
|
/*
|
|
* These types of input strings are accepted:
|
|
*
|
|
* unsigned integer - numid (equivaled to numid=UINT)
|
|
* string - basic mixer name (equivalent to iface=MIXER,name=STR)
|
|
* numid=UINT
|
|
* [iface=MIXER,][device=UINT,][subdevice=UINT,]name=STR[,index=UINT]
|
|
*/
|
|
static ssize_t set_led_id(struct snd_ctl_led_card *led_card, const char *buf, size_t count,
|
|
bool attach)
|
|
{
|
|
char buf2[256], *s, *os;
|
|
struct snd_ctl_elem_id id;
|
|
int err;
|
|
|
|
if (strscpy(buf2, buf, sizeof(buf2)) < 0)
|
|
return -E2BIG;
|
|
memset(&id, 0, sizeof(id));
|
|
id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
|
|
s = buf2;
|
|
while (*s) {
|
|
os = s;
|
|
if (!strncasecmp(s, "numid=", 6)) {
|
|
s = parse_uint(s + 6, &id.numid);
|
|
} else if (!strncasecmp(s, "iface=", 6)) {
|
|
s = parse_iface(s + 6, &id.iface);
|
|
} else if (!strncasecmp(s, "device=", 7)) {
|
|
s = parse_uint(s + 7, &id.device);
|
|
} else if (!strncasecmp(s, "subdevice=", 10)) {
|
|
s = parse_uint(s + 10, &id.subdevice);
|
|
} else if (!strncasecmp(s, "name=", 5)) {
|
|
s = parse_string(s + 5, id.name, sizeof(id.name));
|
|
} else if (!strncasecmp(s, "index=", 6)) {
|
|
s = parse_uint(s + 6, &id.index);
|
|
} else if (s == buf2) {
|
|
while (*s) {
|
|
if (*s < '0' || *s > '9')
|
|
break;
|
|
s++;
|
|
}
|
|
if (*s == '\0')
|
|
parse_uint(buf2, &id.numid);
|
|
else {
|
|
for (; *s >= ' '; s++);
|
|
*s = '\0';
|
|
strscpy(id.name, buf2, sizeof(id.name));
|
|
}
|
|
break;
|
|
}
|
|
if (*s == ',')
|
|
s++;
|
|
if (s == os)
|
|
break;
|
|
}
|
|
|
|
err = snd_ctl_led_set_id(led_card->number, &id, led_card->led->group, attach);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t attach_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
|
|
return set_led_id(led_card, buf, count, true);
|
|
}
|
|
|
|
static ssize_t detach_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
|
|
return set_led_id(led_card, buf, count, false);
|
|
}
|
|
|
|
static ssize_t reset_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
|
|
int err;
|
|
|
|
if (count > 0 && buf[0] == '1') {
|
|
err = snd_ctl_led_reset(led_card->number, led_card->led->group);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static ssize_t list_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
|
|
struct snd_card *card;
|
|
struct snd_ctl_led_ctl *lctl;
|
|
size_t l = 0;
|
|
|
|
card = snd_card_ref(led_card->number);
|
|
if (!card)
|
|
return -ENXIO;
|
|
down_read(&card->controls_rwsem);
|
|
mutex_lock(&snd_ctl_led_mutex);
|
|
if (snd_ctl_led_card_valid[led_card->number]) {
|
|
list_for_each_entry(lctl, &led_card->led->controls, list) {
|
|
if (lctl->card != card)
|
|
continue;
|
|
if (l)
|
|
l += sysfs_emit_at(buf, l, " ");
|
|
l += sysfs_emit_at(buf, l, "%u",
|
|
lctl->kctl->id.numid + lctl->index_offset);
|
|
}
|
|
}
|
|
mutex_unlock(&snd_ctl_led_mutex);
|
|
up_read(&card->controls_rwsem);
|
|
snd_card_unref(card);
|
|
return l;
|
|
}
|
|
|
|
static DEVICE_ATTR_WO(attach);
|
|
static DEVICE_ATTR_WO(detach);
|
|
static DEVICE_ATTR_WO(reset);
|
|
static DEVICE_ATTR_RO(list);
|
|
|
|
static struct attribute *snd_ctl_led_card_attrs[] = {
|
|
&dev_attr_attach.attr,
|
|
&dev_attr_detach.attr,
|
|
&dev_attr_reset.attr,
|
|
&dev_attr_list.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group snd_ctl_led_card_attr_group = {
|
|
.attrs = snd_ctl_led_card_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *snd_ctl_led_card_attr_groups[] = {
|
|
&snd_ctl_led_card_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static struct device snd_ctl_led_dev;
|
|
|
|
static void snd_ctl_led_sysfs_add(struct snd_card *card)
|
|
{
|
|
unsigned int group;
|
|
struct snd_ctl_led_card *led_card;
|
|
struct snd_ctl_led *led;
|
|
char link_name[32];
|
|
|
|
for (group = 0; group < MAX_LED; group++) {
|
|
led = &snd_ctl_leds[group];
|
|
led_card = kzalloc(sizeof(*led_card), GFP_KERNEL);
|
|
if (!led_card)
|
|
goto cerr2;
|
|
led_card->number = card->number;
|
|
led_card->led = led;
|
|
device_initialize(&led_card->dev);
|
|
led_card->dev.release = snd_ctl_led_card_release;
|
|
if (dev_set_name(&led_card->dev, "card%d", card->number) < 0)
|
|
goto cerr;
|
|
led_card->dev.parent = &led->dev;
|
|
led_card->dev.groups = snd_ctl_led_card_attr_groups;
|
|
if (device_add(&led_card->dev))
|
|
goto cerr;
|
|
led->cards[card->number] = led_card;
|
|
snprintf(link_name, sizeof(link_name), "led-%s", led->name);
|
|
WARN(sysfs_create_link(&card->ctl_dev->kobj, &led_card->dev.kobj, link_name),
|
|
"can't create symlink to controlC%i device\n", card->number);
|
|
WARN(sysfs_create_link(&led_card->dev.kobj, &card->card_dev.kobj, "card"),
|
|
"can't create symlink to card%i\n", card->number);
|
|
|
|
continue;
|
|
cerr:
|
|
put_device(&led_card->dev);
|
|
cerr2:
|
|
printk(KERN_ERR "snd_ctl_led: unable to add card%d", card->number);
|
|
}
|
|
}
|
|
|
|
static void snd_ctl_led_sysfs_remove(struct snd_card *card)
|
|
{
|
|
unsigned int group;
|
|
struct snd_ctl_led_card *led_card;
|
|
struct snd_ctl_led *led;
|
|
char link_name[32];
|
|
|
|
for (group = 0; group < MAX_LED; group++) {
|
|
led = &snd_ctl_leds[group];
|
|
led_card = led->cards[card->number];
|
|
if (!led_card)
|
|
continue;
|
|
snprintf(link_name, sizeof(link_name), "led-%s", led->name);
|
|
sysfs_remove_link(&card->ctl_dev->kobj, link_name);
|
|
sysfs_remove_link(&led_card->dev.kobj, "card");
|
|
device_unregister(&led_card->dev);
|
|
led->cards[card->number] = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Control layer registration
|
|
*/
|
|
static struct snd_ctl_layer_ops snd_ctl_led_lops = {
|
|
.module_name = SND_CTL_LAYER_MODULE_LED,
|
|
.lregister = snd_ctl_led_register,
|
|
.ldisconnect = snd_ctl_led_disconnect,
|
|
.lnotify = snd_ctl_led_notify,
|
|
};
|
|
|
|
static int __init snd_ctl_led_init(void)
|
|
{
|
|
struct snd_ctl_led *led;
|
|
unsigned int group;
|
|
|
|
device_initialize(&snd_ctl_led_dev);
|
|
snd_ctl_led_dev.class = &sound_class;
|
|
snd_ctl_led_dev.release = snd_ctl_led_dev_release;
|
|
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.release = snd_ctl_led_release;
|
|
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 - 1];
|
|
device_unregister(&led->dev);
|
|
}
|
|
device_unregister(&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;
|
|
struct snd_card *card;
|
|
unsigned int group, card_number;
|
|
|
|
snd_ctl_disconnect_layer(&snd_ctl_led_lops);
|
|
for (card_number = 0; card_number < SNDRV_CARDS; card_number++) {
|
|
if (!snd_ctl_led_card_valid[card_number])
|
|
continue;
|
|
card = snd_card_ref(card_number);
|
|
if (card) {
|
|
snd_ctl_led_sysfs_remove(card);
|
|
snd_card_unref(card);
|
|
}
|
|
}
|
|
for (group = 0; group < MAX_LED; group++) {
|
|
led = &snd_ctl_leds[group];
|
|
device_unregister(&led->dev);
|
|
}
|
|
device_unregister(&snd_ctl_led_dev);
|
|
snd_ctl_led_clean(NULL);
|
|
}
|
|
|
|
module_init(snd_ctl_led_init)
|
|
module_exit(snd_ctl_led_exit)
|