ALSA: hda: hda_cs_dsp_ctl: Add apis to write the controls directly

DSP controls are exposed as ALSA controls, however,
some of these controls are required to be accessed by
the driver. Add apis which allow read/write of these
controls. The write api will also notify the ALSA control
on value change.
Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220630002335.366545-3-vitalyr@opensource.cirrus.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_cs_dsp_ctl.c

@@ -188,6 +188,45 @@ void hda_cs_dsp_control_remove(struct cs_dsp_coeff_ctl *cs_ctl)
 }
 EXPORT_SYMBOL_NS_GPL(hda_cs_dsp_control_remove, SND_HDA_CS_DSP_CONTROLS);
 
+int hda_cs_dsp_write_ctl(struct cs_dsp *dsp, const char *name, int type,
+			 unsigned int alg, const void *buf, size_t len)
+{
+	struct cs_dsp_coeff_ctl *cs_ctl;
+	struct hda_cs_dsp_coeff_ctl *ctl;
+	int ret;
+
+	cs_ctl = cs_dsp_get_ctl(dsp, name, type, alg);
+	if (!cs_ctl)
+		return -EINVAL;
+
+	ctl = cs_ctl->priv;
+
+	ret = cs_dsp_coeff_write_ctrl(cs_ctl, 0, buf, len);
+	if (ret)
+		return ret;
+
+	if (cs_ctl->flags & WMFW_CTL_FLAG_SYS)
+		return 0;
+
+	snd_ctl_notify(ctl->card, SNDRV_CTL_EVENT_MASK_VALUE, &ctl->kctl->id);
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(hda_cs_dsp_write_ctl, SND_HDA_CS_DSP_CONTROLS);
+
+int hda_cs_dsp_read_ctl(struct cs_dsp *dsp, const char *name, int type,
+			unsigned int alg, void *buf, size_t len)
+{
+	struct cs_dsp_coeff_ctl *cs_ctl;
+
+	cs_ctl = cs_dsp_get_ctl(dsp, name, type, alg);
+	if (!cs_ctl)
+		return -EINVAL;
+
+	return cs_dsp_coeff_read_ctrl(cs_ctl, 0, buf, len);
+}
+EXPORT_SYMBOL_NS_GPL(hda_cs_dsp_read_ctl, SND_HDA_CS_DSP_CONTROLS);
+
 MODULE_DESCRIPTION("CS_DSP ALSA Control HDA Library");
 MODULE_AUTHOR("Stefan Binding, <sbinding@opensource.cirrus.com>");
 MODULE_LICENSE("GPL");

sound/pci/hda/hda_cs_dsp_ctl.h

@@ -29,5 +29,9 @@ struct hda_cs_dsp_ctl_info {
 
 int hda_cs_dsp_control_add(struct cs_dsp_coeff_ctl *cs_ctl, struct hda_cs_dsp_ctl_info *info);
 void hda_cs_dsp_control_remove(struct cs_dsp_coeff_ctl *cs_ctl);
+int hda_cs_dsp_write_ctl(struct cs_dsp *dsp, const char *name, int type,
+			 unsigned int alg, const void *buf, size_t len);
+int hda_cs_dsp_read_ctl(struct cs_dsp *dsp, const char *name, int type,
+			unsigned int alg, void *buf, size_t len);
 
 #endif /*__HDA_CS_DSP_CTL_H__*/