ALSA: jack: Allow building the jack layer without input device
Since the recent integration of kctl jack and input jack layers, we
can basically build the jack layer even without input devices. That
is, the jack layer itself can be built with conditional to enable the
input device support or not, while the users may enable always
CONFIG_SND_JACK unconditionally.
For achieving it, this patch changes the following:
- A new Kconfig, CONFIG_SND_JACK_INPUT_DEV, was introduced to indicate
whether the jack layer supports the input device,
- A few items in snd_jack struct and relevant codes are conditionally
built upon CONFIG_SND_JACK_INPUT_DEV,
- The users of CONFIG_SND_JACK drop the messy dependency on
CONFIG_INPUT.
This change also automagically fixes a potential bug in HD-audio
driver Arnd reported, where the NULL or uninitialized jack instance is
dereferenced.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/Kconfig b/sound/core/Kconfig
index a2a1e24..6d12ca9 100644
--- a/sound/core/Kconfig
+++ b/sound/core/Kconfig
@@ -24,12 +24,15 @@
config SND_COMPRESS_OFFLOAD
tristate
-# To be effective this also requires INPUT - users should say:
-# select SND_JACK if INPUT=y || INPUT=SND
-# to avoid having to force INPUT on.
config SND_JACK
bool
+# enable input device support in jack layer
+config SND_JACK_INPUT_DEV
+ bool
+ depends on SND_JACK
+ default y if INPUT=y || INPUT=SND
+
config SND_SEQUENCER
tristate "Sequencer support"
select SND_TIMER
diff --git a/sound/core/jack.c b/sound/core/jack.c
index 7237acb..f652e90 100644
--- a/sound/core/jack.c
+++ b/sound/core/jack.c
@@ -32,6 +32,7 @@
unsigned int mask_bits; /* only masked status bits are reported via kctl */
};
+#ifdef CONFIG_SND_JACK_INPUT_DEV
static int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
SW_HEADPHONE_INSERT,
SW_MICROPHONE_INSERT,
@@ -40,9 +41,11 @@
SW_VIDEOOUT_INSERT,
SW_LINEIN_INSERT,
};
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
static int snd_jack_dev_disconnect(struct snd_device *device)
{
+#ifdef CONFIG_SND_JACK_INPUT_DEV
struct snd_jack *jack = device->device_data;
if (!jack->input_dev)
@@ -55,6 +58,7 @@
else
input_free_device(jack->input_dev);
jack->input_dev = NULL;
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
return 0;
}
@@ -79,6 +83,7 @@
return 0;
}
+#ifdef CONFIG_SND_JACK_INPUT_DEV
static int snd_jack_dev_register(struct snd_device *device)
{
struct snd_jack *jack = device->device_data;
@@ -116,6 +121,7 @@
return err;
}
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
static void snd_jack_kctl_private_free(struct snd_kcontrol *kctl)
{
@@ -209,11 +215,12 @@
struct snd_jack *jack;
struct snd_jack_kctl *jack_kctl = NULL;
int err;
- int i;
static struct snd_device_ops ops = {
.dev_free = snd_jack_dev_free,
+#ifdef CONFIG_SND_JACK_INPUT_DEV
.dev_register = snd_jack_dev_register,
.dev_disconnect = snd_jack_dev_disconnect,
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
};
if (initial_kctl) {
@@ -230,6 +237,9 @@
/* don't creat input device for phantom jack */
if (!phantom_jack) {
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+ int i;
+
jack->input_dev = input_allocate_device();
if (jack->input_dev == NULL) {
err = -ENOMEM;
@@ -245,6 +255,7 @@
input_set_capability(jack->input_dev, EV_SW,
jack_switch_types[i]);
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
}
err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
@@ -262,13 +273,16 @@
return 0;
fail_input:
+#ifdef CONFIG_SND_JACK_INPUT_DEV
input_free_device(jack->input_dev);
+#endif
kfree(jack->id);
kfree(jack);
return err;
}
EXPORT_SYMBOL(snd_jack_new);
+#ifdef CONFIG_SND_JACK_INPUT_DEV
/**
* snd_jack_set_parent - Set the parent device for a jack
*
@@ -326,10 +340,10 @@
jack->type |= type;
jack->key[key] = keytype;
-
return 0;
}
EXPORT_SYMBOL(snd_jack_set_key);
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
/**
* snd_jack_report - Report the current status of a jack
@@ -340,7 +354,9 @@
void snd_jack_report(struct snd_jack *jack, int status)
{
struct snd_jack_kctl *jack_kctl;
+#ifdef CONFIG_SND_JACK_INPUT_DEV
int i;
+#endif
if (!jack)
return;
@@ -349,6 +365,7 @@
snd_kctl_jack_report(jack->card, jack_kctl->kctl,
status & jack_kctl->mask_bits);
+#ifdef CONFIG_SND_JACK_INPUT_DEV
if (!jack->input_dev)
return;
@@ -369,6 +386,6 @@
}
input_sync(jack->input_dev);
-
+#endif /* CONFIG_SND_JACK_INPUT_DEV */
}
EXPORT_SYMBOL(snd_jack_report);
diff --git a/sound/pci/Kconfig b/sound/pci/Kconfig
index 8f6594a..32151d8 100644
--- a/sound/pci/Kconfig
+++ b/sound/pci/Kconfig
@@ -866,7 +866,7 @@
select SND_OXYGEN_LIB
select SND_PCM
select SND_MPU401_UART
- select SND_JACK if INPUT=y || INPUT=SND
+ select SND_JACK
help
Say Y here to include support for sound cards based on the
Asus AV66/AV100/AV200 chips, i.e., Xonar D1, DX, D2, D2X, DS, DSX,
diff --git a/sound/pci/hda/Kconfig b/sound/pci/hda/Kconfig
index e94cfd5..bb02c2d 100644
--- a/sound/pci/hda/Kconfig
+++ b/sound/pci/hda/Kconfig
@@ -4,7 +4,7 @@
tristate
select SND_PCM
select SND_VMASTER
- select SND_JACK if INPUT=y || INPUT=SND
+ select SND_JACK
select SND_HDA_CORE
config SND_HDA_INTEL
diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
index 7ea66ee..182d92e 100644
--- a/sound/soc/Kconfig
+++ b/sound/soc/Kconfig
@@ -6,7 +6,7 @@
tristate "ALSA for SoC audio support"
select SND_PCM
select AC97_BUS if SND_SOC_AC97_BUS
- select SND_JACK if INPUT=y || INPUT=SND
+ select SND_JACK
select REGMAP_I2C if I2C
select REGMAP_SPI if SPI_MASTER
---help---