On 6/22/2022 9:46 AM, Vitaly Rodionov wrote:
From: Stefan Binding <sbinding@xxxxxxxxxxxxxxxxxxxxx>
The cs35l41 part contains a DSP which is able to run firmware.
The cs_dsp library can be used to control the DSP.
These controls can be exposed to userspace using ALSA controls.
This library adds apis to be able to interface between
cs_dsp and hda drivers and expose the relevant controls as
ALSA controls.
Signed-off-by: Stefan Binding <sbinding@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Vitaly Rodionov <vitalyr@xxxxxxxxxxxxxxxxxxxxx>
---
MAINTAINERS | 1 +
sound/pci/hda/Kconfig | 4 +
sound/pci/hda/Makefile | 2 +
sound/pci/hda/hda_cs_dsp_ctl.c | 207 +++++++++++++++++++++++++++++++++
sound/pci/hda/hda_cs_dsp_ctl.h | 33 ++++++
5 files changed, 247 insertions(+)
create mode 100644 sound/pci/hda/hda_cs_dsp_ctl.c
create mode 100644 sound/pci/hda/hda_cs_dsp_ctl.h
...
+
+static unsigned int wmfw_convert_flags(unsigned int in)
+{
+ unsigned int out, rd, wr, vol;
+
+ rd = SNDRV_CTL_ELEM_ACCESS_READ;
+ wr = SNDRV_CTL_ELEM_ACCESS_WRITE;
+ vol = SNDRV_CTL_ELEM_ACCESS_VOLATILE;
+
+ out = 0;
+
+ if (in) {
+ out |= rd;
+ if (in & WMFW_CTL_FLAG_WRITEABLE)
+ out |= wr;
+ if (in & WMFW_CTL_FLAG_VOLATILE)
+ out |= vol;
+ } else {
+ out |= rd | wr | vol;
+ }
+
+ return out;
+}
This is more question of preference, so you can leave above function as
is, but you could also do something like the following, which is bit
shorter:
static unsigned int wmfw_convert_flags(unsigned int in)
{
unsigned int out = SNDRV_CTL_ELEM_ACCESS_READ;
if (!in)
return SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_VOLATILE;
if (in & WMFW_CTL_FLAG_WRITEABLE)
out |= SNDRV_CTL_ELEM_ACCESS_WRITE;
if (in & WMFW_CTL_FLAG_VOLATILE)
out |= SNDRV_CTL_ELEM_ACCESS_VOLATILE;
return out;
}
+
+static int hda_cs_dsp_add_kcontrol(struct hda_cs_dsp_coeff_ctl *ctl)
+{
+ struct cs_dsp_coeff_ctl *cs_ctl = ctl->cs_ctl;
+ struct snd_kcontrol_new *kcontrol;
+ struct snd_kcontrol *kctl;
+ int ret = 0;
+
+ if (cs_ctl->len > ADSP_MAX_STD_CTRL_SIZE) {
+ dev_err(cs_ctl->dsp->dev, "Control %s: length %zu exceeds maximum %d\n", ctl->name,
+ cs_ctl->len, ADSP_MAX_STD_CTRL_SIZE);
+ return -EINVAL;
+ }
+
+ kcontrol = kzalloc(sizeof(*kcontrol), GFP_KERNEL);
+ if (!kcontrol)
+ return -ENOMEM;
+
+ kcontrol->name = ctl->name;
+ kcontrol->info = hda_cs_dsp_coeff_info;
+ kcontrol->iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+ kcontrol->private_value = (unsigned long)ctl;
+ kcontrol->access = wmfw_convert_flags(cs_ctl->flags);
+
+ kcontrol->get = hda_cs_dsp_coeff_get;
+ kcontrol->put = hda_cs_dsp_coeff_put;
+
+ kctl = snd_ctl_new1(kcontrol, NULL);
Wouldn't
kctl = snd_ctl_new1(kcontrol, ctl);
work instead of
kcontrol->private_value = (unsigned long)ctl;
...
kctl = snd_ctl_new1(kcontrol, NULL);
?
You can then get the value using snd_kcontrol_chip() macro, so instead
of doing quite long lines with casts like:
struct hda_cs_dsp_coeff_ctl *ctl = (struct hda_cs_dsp_coeff_ctl
*)kctl->private_value;
you could do
struct hda_cs_dsp_coeff_ctl *ctl = snd_kcontrol_chip(kctl);
