Re: [PATCH v3 2/2] ALSA: Add new driver for MARIAN M2 sound card

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On 9/20/23 19:55, Takashi Iwai wrote:
+	spin_lock(&marian->reglock);
+	marian_generic_set_dco(marian, ucontrol->value.integer.value[0]);
+	spin_unlock(&marian->reglock);

The control get/put callbacks can sleep, hence usually it's
spin_lock_irq().  Or if the all places for this lock are sleepable
context, use a mutex instead.


Alright, it looks like reglock is used in sleepable context only, so I'll replace it with mutex. Thanks!

+static int marian_control_pcm_loopback_info(struct snd_kcontrol *kcontrol,
+					    struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 1;
+
+	return 0;

This can be replaced with snd_ctl_boolean_mono_info.



Oh, I forgot to use 'snd_ctl_boolean_mono_info' here. Will be done.

+}
+
+static int marian_control_pcm_loopback_get(struct snd_kcontrol *kcontrol,
+					   struct snd_ctl_elem_value *ucontrol)
+{
+	struct marian_card *marian = snd_kcontrol_chip(kcontrol);
+
+	ucontrol->value.integer.value[0] = marian->loopback;
+
+	return 0;
+}
+
+static int marian_control_pcm_loopback_put(struct snd_kcontrol *kcontrol,
+					   struct snd_ctl_elem_value *ucontrol)
+{
+	struct marian_card *marian = snd_kcontrol_chip(kcontrol);
+
+	marian->loopback = ucontrol->value.integer.value[0];

Better to normalize with !!ucontrol->value.integer.value[0].
The value check isn't done as default.

Will be fixed, thanks!

+static int marian_control_pcm_loopback_create(struct marian_card *marian)
+{
+	struct snd_kcontrol_new c = {
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = "Loopback",

Better to have "Switch" suffix.


Yeah, and I guess some other controls also have to be renamed. Will be done :)

+static int marian_m2_output_frame_mode_create(struct marian_card *marian, char *label, u32 idx)
+{
+	struct snd_kcontrol_new c = {
+		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name = label,
+		.private_value = idx,
+		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_VOLATILE,

Does this have to be VOLATILE?  Some others look also dubious.
Basically you set the value via this mixer element, then it's
persistent.


As I understand, some controls which depend on external inputs (like the 'Input 1 Freq', which measures frequency on the Input 1), should be volatile, right?

This one definitely shouldn't, so I will change it to persistent.

Thank you for your prompt reply and review!

--
Kind regards,
Ivan Orlov


thanks,

Takashi




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